ANSI Y14.7.2-1978

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A M E R I C A NA T I O N A LT A N D A R D

ENGINEERING DRAWING ANDRELATED DOC UMENTATION PRACTICES

Gear and Spline Drawing Standards

Part 2-Bevel and

Hypoid

Gears

ANSI Y14.7.2

-

1978

~

-

SECRETARIAT

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

AMERICAN SOCIETY OF ENGINEERING EDUC ATION

SOCIETY OF AUTOMOTIVE ENGINEERS

P U B L I S H E D B Y

T H EA M E R I C A N O C I E T Y O F M E C H A N I C A L N G I N E E R S

U n i t e d n g i n e e r i n g e n t e r4 5

E a s t

4 7 t ht r e e t N ew York, N. Y. 0017

yright ASME Internationalided by IHS under license with ASME

Document provided by IHS Licensee=Deere & Co/9999663100, 02/02/2005 00:47:53MST Questions or comments about this message: please call the Document PolicyGroup at 303-397-2295.

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REAFFIRMED 2004

FOR CURRENT COMMITTEE PERSONNEL

PLEASE E-MAIL [email protected]

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ANSI Y14.7.2-1978

2

February 1978

ACCEPTANCE NOTICE

The above non-government Stand ardization Docu men t was ado pted on 2 February 1978 and is approved

for use by the DoD. The indicated industry group has furnished the clearances required by existing regula-

tions. Copies of the document are stocke d by DoD Single Stoc k Poin t, Naval Publications and Form s Cen-

ter,

Philadelphia, Pa., 19120 for issue

to

DoD activities only. Contractors and industry groups may obtain

copies directly from:

The American S ociety of Mechanical Engineers

345 E. 47th St . ,New Yor k, N.Y., 100 17 or

The American Natipnal Standards Institute

143 0 Broadway, New York , N.Y. 1001 8

Title

of

Docu men t: Gear and Spline Drawing Standards-Part

2

Bevel and Hypoid Gea rs

Docu men t No.: ANSI Y14.7.2-1978

Date

of

Specific Issue Ado pted : 17 Januar y 1978

Releasing Industry Group : T he American Society of Mechanical Engineers

Custodians;:

Army

-

AR

A i r

Force

-

16

Navy - AS

User

Activities:

Army - AR, AV, AT, EL, E, MI

Navy

-

MC, OS SH , YD, AS

Air Forc:e -

16,

1 1

Military Coordinating Activity:

Army

-

AR

Project Number: DRPR-019

No part of this document may be reproduced in any form, in an electronic

retrieval system or otherwise, without the prior written permission of the

publisher.

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

Copyright 1978 by

All Rights Reserved

Printed n U.S.A.



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FOREWORD

For many years there was a growing desire for a national standard for engineering drawings, and as far

backasDecember1914ASMEapprovedandpubl ished he eportof tsCommit teeonStandards or

Cross-Sections.

The subject of standard practice was aid befor e the ASME Standardiz ation Com mittee in April 1925

and in May the ASME Counci l voted to appro ve the recomm endat ion .of the Comm it tee that the American

Standards Associat ion be requested to authorize the organizat ion of a nat ional ly representat ive commit tee

under its procedures t o develop standards for drawings and drafting room practice. This recommendation

was considered favorably and a preliminary conference was called by the ASA for October 14, 192 5, and a

general conference for December4 , 1 9 2 5 .

At the meet ing of the ASA Standard s Coun ci l , Decem ber 1925 , the project was f inal ly approved, t s

scope was out l ined, and the Society for the Promotion of Eng ineering Educat ion and the Am erican Society

of Mechanical Engineers were designated as joint sponsors. The organization meeting of the sectional com-

mit tee was held September 24, 1926, a t which Dean Frankl in deR. Furman was elected chairman. Subse-

quent ly s ix subcommit tees were appointed. These subcommit tees undertook the formulat ion of tenta t ive

drafts of the several sections of the final report which were distributed for criticism and comment.

In the spr ing of 1931 an Edi t ing Commi t t ee , Dr . Thomas E . F rench , Cha i rman, combined and ha rmo-

nized th e final reports of the several subcommittees. The proposed standard was approved by the sectional

commit teeand was subsequentlyapprovedby he ponsor ocietiesand ransmit ted o heAmerican

Standards Association for approval and designation as an American Stan dard, a status which was granted in

May, 1935.

The sect ional commit tee authorized the revis ion of the American Standard in Decembe r, 1940, and the

Subc omm it tee on Revisionwas appointed n September, 1941. A draft dated August , 1944 received the

approval

of

the sectional commit tee . The proposal was subsequen t ly submit ted to the sponsors and to the

American Standards Association for their approval. This approval with designation as an American Standard

was received

on

Apri l 12, 1946.

In 1948, the scope of the projectwas enla rged , and a revision was b egun in view of th e inc rease d dra fting

standardization work in Great Britain and Canada. An Execut ive Commit tee was formed in 1 949 to sup er-

vise th e wor k. It was decided to publish the eventual revision in separate sections. Upon completion and

sect ional commit tee approval of the las t of the f i rst s ix sect ions, they were sent o sponso rs a nd to ASA for

approval.Succeedingsections , as approved by he sect ional commit tee were subsequent ly submit ted o

sponsors

and ASA.

A section, Gears, Splines and Serrations, Y14.7, was approved and published as an American Standard

o n A p ri l 8 , 1 9 5 8 .

Recognizing the need for a universal gear draf ting stan dard , a C OR C om mitt ee as organized, in Decem-

ber 1961 , for the purpo se of coordinat ing the views of the SAE, Y14, the Mil i tary and the AGMA on a

draftin g standard for gears which could provide a fundam ental docum ent for wide national use of all inter-

ested parties.

I t was recommend ed by the SAE Drawing Standards Comm it tee and concurred in by the members of

the COR co mmit tee that this sect ion be divided into parts wi th Part covering spur, helical , double-hel ical ,

and rack gears, Part

2

covering bevel and hypo id gears, Part 3 covering crossed helical gears, worm gears,

Spiroid and Helicon gears, and Part 4 covering splines.

After e ight meet ings , the COR Comm it tee was incorpo rated into Subco mmit tee7 of S tandards Commi t -

tee Y14. Many drafts were c i rcula ted among the members of AG MA, AOA, SAE, Y14 and the Mil i tary for

suggestions and criticisms.

iii

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During this time the American Standards Association became the United S tates

of

America Standards

Institute and,. as

of

October 6, 196 9, the American National Standards Institute, Inc. In addition, he

Society of Autom otive Engineers became a cospon sor, along with the ASEE an d the ASME

of

all

Y14

Drafting Practices.

Part1 was designated an American National Sta nda rdon November 1,1971. This section covering

Part

2

received the approval

of

the Y14 Standards Comm ittee and was subsequently approved by the spon-

sor societies a nd sub mi tted to the American National Standards Institute. It was designated an American

National Standard on 17 January, 1978.

iv

yright ASME Internationalided by IHS under license with ASME Document provided by IHS Licensee=Deere & Co/9999663100, 02/02/2005 00:47:53MST Questions or comments about this message: please call the Document PolicyGroup at 303-397-2295.

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AMERICAN NATIONAL STANDARDS COMMITTEE

Y14

Engineering Draw ing and Related Documentation Practices

The fo l lowing s t he Ros ter of t h e C o m m i t t e e a t t h e t i m ef approval

of

t h i s S t andard)

OFFICERS

R . F. Franciose Chairman

C. W.

Stockwell Vice Chairman E.

L.

Kardas Vice Chairman

C. J. Gomez Secretary

COMMITTEE PERSONNEL

AMERICAN GEAR MANUFACTURERS ASSOCIATION

G.

L. Scon American Gear Manufacturers Associat ion, Washington, D.C.

AEROSPACE 1NDUSTRIES.ASSOCIATION OF AMERICA, INC.

R.

E.

Linse, North American Rockwell Corporat ion, El Segundo, Cal i fornia

R. C. Robley, Westinghouse Electr ic Corporat ion, Electura Systems Support D ivis ion, Hunt Val ley, Maryland

AMERICAN NSTITUTE FOR DESIGN AND DRAFTING

f . A. Saint, Kansas Gas Electr ic Company, Wichi ta, Kansas

AMERICAN SOCIETY FOR ENGINEERING EDUCATION, THE

R. W. Bokenkamp, University of Illinois, Urbana, Illinois

K.

E.

Botkin, Purdue Un ivers i ty, Lafayet te, Indiana

W . J. Luzadder, Purdue U nivers i ty, Lafayet te, Indiana

C. H. Springer, No. F or t Myers , Flor ida

AMERICAN SOCIETY

O F

CIVIL ENGINEERS

f

. Kircher, Malcolm Pirnie, Inc., White Plains, New Y ork

AMERICAN SOCIETY O F HEATING, REFRIGERATING AIR CONDITIONING ENGINEERS

fr it z Honerkamp, Anemostat Corp. of America, Scranton, Pennsylvania

H. J. Donovan, Alternate, Carr ier Corporat ion, Syracuse, New York

N. A. Lacourte, Alternate, AmericanSocietyofHeat ing,Refrigera ting Air Cond itioningEngineers ,NewYork,

New York

AMERICAN SOCIETY

OF

MECHANICAL ENGINEERS, TH E

A. R. Machell, Jr., Xerox Corporat ion, Rochester , New York

ff. . Spalding, Urbana, Illinois

ASSOCIATION OF AMERICAN RAILROADS

M. f McCorcle,

St.

Louis-San Francisco R ailway, Springfield, Missouri

BRITISH STANDARDS NSTITUTION

C. R. Austin, Liaison, Rolls Royce, Ltd. , Derby, Ihgland

COMPUTERS AND BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATION

W.

M. Souza, IBM Corporat ion, San Jose, C al i fornia

CANADIAN STANDARDS ASSOCIATION

f Rowland Hi //, Liaison, St . Cather ines , Ontar io , Canada

CONSTRUCTION INDUSTRIES MANUFACTURERS ASSOCIATION

L.

R. Srrang, Caterpi l lar Tractor Company, East Peor ia, I l l inois

P.

McKim, Alternate, Caterpi l lar Tractor Company, East Peor ia, I l l inois

yright ASME Internationalded by IHS under license with ASME


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ILLUMINATING ENGINEERING SOCIETY

L.

E.

Barbrow; National Bureau of Standards , Washington, D.C.

J.

E.

Kaufman, Alternate, I l luminat ing Engineer ing Society, New York, New Y ork

I N S T I T U T E O F E L E C T R I C A L E L E C T R O N IC S E N G I N E E R S , T H E

C.

R. Muller,

The Ins t i tute of Electr ical Electronics Engineers , New York, New York

C.

A. Fricke, Alternate,

Aeronutronics-Ford Corporat ion, Wil low Grove, Pennsylvania

MANUFACTU RING CHEMISTS ASSOCIATION

John B erts, Jr., E.I . DuPo nt de Nemo urs Company, Wilmington, Delaware

MOTOR VEHICLE MANUFACTURERS A SSOCIATION

J. H. Venema,

Ford Motor Company, Dearborn, Michigan

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION

R.

F.

Franciose, General Electr ic Company, Eng ineer ing Standards and Specif icat ions , San Jose, Cal i fornia

R.

L Mancini, Alternate, National Electr ical Manufacturers Associat ion, New York, New York

NAT IONAL FLUID POWER ASSOCIATION

J.

L.

fisher, Jr., Bellows Valvair, A kron, Ohio

NATIONAL MACHINE TOOL BUILDERS ASSOCIATION

L G. Glesmann, Gleason Works , Rochester , New York

SOCIETY O F AUTOM OTIVE ENGINEERS

G.

M.

Garcina,

All ison Divis ion, General Motors C orporat ion, Indianapol is , Indiana

E. L.

Kardas, Prat t Whitney Aircraf t , East Har t ford, Connec t icut

J.

E.

Long,

General Motors Corporat ion, Warren, Michigan

C.

W. Srockwell,

Internat ional Harvester C ompany, Hinsdale, I l l inois

L.

V.

Porrer, Alternate, General Electr ic Company, Lynn, Ma ssachuset ts

. H. E. Guetzlaff, JohnDeereWater looTractorWorks ,Water loo , owa

S O C IE T Y O F M A N U F A C T U R I N G E N G I N E E R S

Joe Fenn, Indianapol is , Indiana

SOCIETY O F NAVAL ARCHITECTS AND MARINE ENGINEERS

G. R. Daniels,

Quincy, M assachuset ts

TECHNICAL DESIGN ASSOCIATES

R. L. Vanderzille, Eastman Kodak Comp any, Rochester , New York

R .

E.

Nisfa, Alrernare, Combust ion Engineer ing, Ihc. , Windsor , Con nect icut

TELEPHONE G R O U P

H.

A. Spielman,

Western Electric Company, New York, New York

R.

E,

Thiemer, Bell Telephone L aborator ies , Holmdel , New Jersey

A. Maone,

Western Electr ic Co., New York, New York

TRADE AND HIGH SCHOOL GROUP

Frank Scott, Belleville Juni or Co llege , Belleville, Illinois

U.S. DEPARTMENT OF

T H E

A R M Y

U.S . D E P A R T M E N T

O F

C O M M E R C E

M . E. Taylor,

Army Armament Research and Development Command, Dover , New Jersey

D.

M,

Mills, Patent Off ice Draf t ing Branch, Washington, D.C.

INDIVIDUAL MEM BERS

Burt Brown,

General Dynamics Corporat ion, For t Worth, Texas

H . L Dubocq, Grumman A erospace Corpora tion , Bethpage, New Y ork

J. J. Duero, A. 0 mith Corporat ion, Milwaukee, Wisconsin

R. J. Dybas, Bell AerosystemsCompany, Buffalo, New York

C.

J. Fausf, Lycoming D ivis ion, AVCO Corporat ion, Strat ford, Connect icut

G. J. Fisher, Thiokol Chemical Corporat ion, Rr igham City, Utah

t R. D. Furay, Vought Systems D ivis ion, LTV Aerospace Corporat ion, Dal las , Texas

* E . E. Heibeck, Chrysler Corporat ion, Detroi t , Michigan

E.

w

Lewis,

Chevrolet Divis ion, General Motors Corporat ion, Warren, Michigan

R. E.

Moore, Cessna Aircraf t Company, C ommercial Aircraf t Divis ion, Wichi ta. Kansas

tS.

H. Watson, Haddo nfield, New Jersey

vi



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PERSONNEL O F SUBCOMMITTEE 7 GEARS AND SPLINES

J. E.

Long, Chairman,

General Motors Corporation Warren Michigan

W.

M. Ahern, Internat ional Harvester Company Melrose Park Illinois

Roland Barlow, Ex-Ce1l-O Corporation Walled Lake Michigan

R.

J.

Belansky,

Illinois Tool Works Chicago Illinois

K .

E.

Botkin,

Purdue University Lafayette Indiana

P.

M.

Dean,

Mechanical Technology Incorporated Latham New York

Erwin F Geppert,

U.S.

Army Tank Automotive Command Warren Michigan

J.

J.

Knopp, Gleason Works Rochester New York

Robert K oehler,

Milwaukee Gear Company Milwaukee Wisconsin

J. f Kothman,

General Electric Company Lynn Massachusetts

C.

J. Krzyszczak,

Fruehauf Corporation Warren Michigan

V.

A. Lenar,

Oak Park Michigan

E. J.

Margavich,

U.S. Army Tank Automotive Command Warren Michigan

Thaddeus Pietrykowski, U.S.

Army Tank Automotive Command Warren Michigan

Thomas Raye, Raska Spline Products Company Warren Michigan

C. K

Reece,

John Deere Waterloo Tractor Works Waterloo Iowa

G. J. Schmidt (Alternarel, Illinois

Tool

Works Chicago Illinois

G. L. Scott,

American Gear Manufacturers Association Washington D.C.

D. L. Thurman,

Caterpillar Tractor Company East Peoria Illinois

J.

T. Wilson, Ford Motor Company Warren Michigan

tC. A. Nazian,

Frankford Arsenal Philadelphia Pennsylvania

W

L. Tuschak,

General Motors Corporation Ypsilanti Michigan

CONSULTANTS

tWells Coleman, Rochester New York

t h i n Grif f i th, Birmingham Michigan

tC.

H. Parker,

North Springfield Vermont

t R .

F. Zogbaum, Jr.,

East Hartford Connecticut

D. W. Dudley,

International Harvester Company San Diego California

t

Retired

*Deceased

vii



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CONTENTS

Subsection Page

1 Scope

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2urpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3General Drawing Practice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Gear Drawing Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

Dimensioning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DrawingFormat

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DrawingTitle

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Straight Bevel Gear Teeth

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spiral Bevel Gear Teeth

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Angular Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hypoid Gear Teeth

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MatchedSets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5Gear To oth Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1

5.2

5.3

5.4

5.5

5.6

5.7

5.8

5.9

5.10

5.1 1

5.12

5.13

5.14

5.1

5

Axialplane

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PitchPlane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transverse Plane

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NormalPlane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MeanPoint

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ToothTrace

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diametral Pitch

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PressureAngle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tange nt Plane

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Metric)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SpiralAngle

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hand

of

Spiral

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hypoid Pinion Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Direction

of

Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T o o t h F o r m

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 5.1 Gene rated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1

5.2 Non-Generated

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.15.3 CONIFLEX@ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.15.4 REVACYCLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.15.5FORMATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 5.6 HEL IXFO RM a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.15.7 ZEROL@ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.16 Depthwise To oth Taper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.17 Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

9

9

9

9

9

9

9

9

9

9

9

10

10

10

10

10

10

10

10

10

10

1 0

10

ix



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Subsection Page

5.18

5.19

5.20

5.21

5.22

5.23

5.24

5.25

5.26

5.27

5.28

5.29

5.30

5.3

1

Baclilash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

5.18.1 Backlash Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

5.18.2 Backlash Variation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

5.18.3 Backlash Variationolerance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Circularhickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

Measuring Addendum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Measuring Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 1

Mean Measuring Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Runout Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

Pitch Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Index Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

.Com posite Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Tooth Surface Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

AGMA Quality Class

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

V a n d H C h e c k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Face Angle Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

BackAngle Distance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

Figures

1 Straight Bevel Gear/Pinion

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

2 Data Specifications for Straight Bevel Gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3piral Bevel Gear/Pinion

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

4 Data Specifications for Spiral Bevel Gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

5ypoid Pinion

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

6 HypoidGear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

8 DataSpecifications for Bevel Gear Matched Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

9 Bevel GearNomenclature-Axial Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

10

Hypoid Gear Nom enclature-Ax ial Plane

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14

11

Bevel GearNom enclature-Tra nsverse Plane atOutsideDiameter . . . . . . . . . . . . . . . . . . . . 1 5

12 Bevel Gear Nom enclature-No rmal Plane at he Mean Point . . . . . . . . . . . . . . . . . . . . . . . . 16

13 Mean Spiral Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

14

Pressure Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

15 Hand

of

Spiraland Pinion Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

.

7

Data Specifications for Hypoid Gears

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

X



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8/10/2019 ANSI Y14.7.2-1978

10/27

ANSI Y14.7.2-1978

AMERICAN NATIONAL STANDARD

ENGINEERING DRAWING AND RELATED DOCUMENTATION PRACTICES

Gear and Spline Drawing Standard

Part 2 for Bevel and Hypoid Gears

1

SCOPE.

This standard establishes me tho ds o be

followed in specifying drawing data for gears with in-

tersecting axes bevel gears), and non-pa rallel, non -

intersecting axes hyp oid gears). It also discusses the

method

of

specifying ma tched sets on a gear drawing.

2 PURPOSE. The purpose of this standard is to es-

tablish engineering drawing tandards which define he

finished prod uct or he following types of gears:

straight bevel, spiral bevel, and hypoid.

3 GENERAL DRAWINGPRACTICES. General draw-

ing practices re covered in ANSI Y14.1 throug h

ANSI Y14.5 of these AmericanNational Standards

for Engineering Drawing and Related Documentation

Practices. For he particularpractices, refer to he

applicable standard.

4 GEAR DRAWING PRACTICES.

Illustrations of

various gear con figu ratio ns are provided for guidance

only and are not manda tory.

4.1 Dimensioning.

Illustrations howonly hosedi-

mensions which cont rol the gear teeth and their

rela-

tion to the mo unting surfaces. Dimensional values are

indicated by Xs to show the numberf de cimal places

recommended in each instance.

4.2 AngularDimensions. All angulardimensionsare

expressed in degrees and decimal portion s hereof.

Specification of angles in degrees, minutes,nd

seconds is optional.

4.3 Drawing Format.

A gear drawingconsists of a

side view or axial section illustrating the general con-

figuration and tabulated gear tooth data. A front view

is used where necessary to sho w relationship of the

gear te eth oother eatures.Location of tabulated

gear tooth data s optional.

4.4 Drawing Title. For dentification purposes, the

title should include the word pinion or gear as appli-

cable.

4.5 Straight Bevel Gear Teeth

4.5.1 Straight bevel gear and pinion teeth are drawn

as shown in Figure 1. The mou nting distance shown

on the drawing is an assembly dimension and is speci-

fied as a reference dimension.

4.5.2 Gear datanot included n Figure 1 are tabu-

lated on the drawing as shown in Figure 2. The draw-

ingmust also show material nd eat treatme nt

specifications.

4. 6 Spiral Bevel Gear Teeth

4.6.1 Spiral bevel gear andpinion teeth are drawn

as shown in Figure

3 .

4.6.2 Gear d ata no t illustrated in Figure

3

are tabu-

late d o n the drawing as shown in Figure 4. T he draw-

ingmust also show material and heat treatme nt

specifications.

4.7 Hypoid Gear Teeth

4.7.1

Hypoid pinion and gear teeth are drawn as

shown in Figures 5 and 6 respectively.

4.7.2 Gear da ta not included in Figures 5 and 6 are

tabulatedon he drawingasshown in Figure

7.

The ~

drawing must also show material and heat treatm ent

specifications. Distances from the pitch apex

for

the

gear m ember only, face apex, and root apex o he

crossing point centerline of the mating memb er) are

included as reference dimensions. Values are positive

when the apex is beyondhe crossing point and

negative when the apex lies between the gear and

crossing point. Thepitch diameter and pitch angle

are specified on the gear membe r o nly.

1


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GEAR AND SPLINE DRAWING STANDARD

PART 2 FOR: 3EVEL AND HYPOID GEARS ANSI Y14.7.2-1978

A

x.xxx

.;/

L EA CH RAD I AL L EMENT

. xxx

+ . X X X )

. xxx

X . X X X X )

-Mounting Distance-

1 .

When face angle distance and back angle distance see

FIG. 9)

are used f or dimensioning the gear blank, the face

angle alnd the back angle should be given as reference dimension s on the drawing, wit hout a t olerance.

FIG. 1 STRAIGHT BEVEL GEAR/P INION

2



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8/10/2019 ANSI Y14.7.2-1978

12/27



PART 2

FOR

BEVEL AND H Y P O I D GEARS

ANSI Y14.7.2-1978

NUMBER OF TEETH

DIAMETRAL PITCH'

PRESSURE ANGLE

PITCH DIAMETER

ADDENDUM

WORKING DEPTH

WHOLE DEPTH

THEORETICAL OUTSIDE DIAMETER

THEORETICAL CROWN TO BACK

PITCH ANGLE

ROOT ANGLE

CIRCULAR THICKNESS

MEAN MEASURING ADDENDUM

MEAN MEASURING THICKNESS

NORMAL BACKLASH WITH MATE

BACKLASH VARIATION TOLERANCE3

SHAFT ANGLE

FILLET RADIUS

RUNOUT TOLERANCE3

PITCH TOLERANCE3

INDEX TOLERANCE3

TOOTH SUR FACE TEXTURE

AGMA QUALITY CLASS

TOOTH FORM

DRIV ING MEMBER

DIRECTION OF ROTATION

MFG SUMMARY NUMBER

PART NUMBER OF MATE

NUMBER OF TEETH IN MATE

xx

(XX.XXX)

(XX.XX )

(X.XXXX)

(.XXXI2

(.XXXI2

.xxx-.xxx2

(X.XXX)2

(X.XXXI2

( x x . x x o ) 2

(XX.XX0)

. xxxx )2

. xxx2

.xxx - .xxx2

.xxx- .xxx2

. x x x x

(XX.XX )

. x x x - . x x x 2

. xxxx

. xxxx

.xxxx

XX AA

OR

R a

x x

CONIFLEX@ OR

REVACYCLEa

PINION

OR

GEAR

CW AND/OR CCW

xxxxxx

x x x x x x

x x

2. Formetric drawings, the number of d ecimal places to the right of the decimal point should be reduced by one.

1 .

Formetric

drawings, specify module in plac eof diametral

pitch. (See 5.9).

3. See 5.18.3. 5.23, 5.24, 5.25and 5.26 concerning when to

specify these values on the gear drawin g.

FIG. 2 DATA SPECIFICATIONS FOR STRAIGHT BEVEL GEARS

3

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13/27

AM E RI CAN NAT I ONAL S T ANDARD


PART 2 FOR BEVEL AND HYPOID GEARS

x.xxx

A

x .xxx

x.xxx

f

ANSI Y14.7.2-197

Axis of Mating Mem,ber

xx.xx0

-xx.xxo

J

X.XXXX)

-

ounting Distance

1. When face angle distance and back angle distance (see FIG.

9)

are used for dimen sionin g the gear blank , the face

angle and the back angle should be given

as

reference dimensions on the drawing, without a olerance.

FIG. 3 SPIRAL BEVEL GEAR/PINION

4


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14/27

8/10/2019 ANSI Y14.7.2-1978

15/27

A M E R I C A N N A T I O N A L S T A N D A R D

GE A R A N D S P L I N E D R A W I N G S T A N D A R D

P A R T 2

FOR

B E V E L A N D HYPOID GE A R S

ANSI Y14.7.2-1978

x.x:xxx

Q x.x.xxx- : : : : q q

.xxx

. X X X )

Axis of Mating

Member

( x.xxx x

)

Mounting Distance

E A C H R A D I A L E L E M E N T

1. Whe n face angle distance and back angle distance (see FIG. 9) are used for dimensioning the gear blan k, the face

angle and the back elngle should be given as reference dimensions on the dra win g, w ith out tolerance .

FIG.

5

HYPOID

PINION

6

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PART 2

FOR

BEVEL AND HYPOID GEARS ANSI Y14.7.2-1978

xx

x x

1 .

When face angle distance and back angle distance (see

FIG. 9)

are used for dimensioning the gear blank, the face

angle and the back angle should be given as reference dimensions on the draw ing, with outa tolerance.

FIG. 6

HYPOID

GEAR


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8/10/2019 ANSI Y14.7.2-1978

17/27



PART 2 FOR BIEVEL AND HYPOID GEARS

ANSI Y14.7.2-1978

NlJMBER OF TEETH

DIAMETRAL PITCH'

- NORMAL PRESSURE ANGLE-GEAR CONVEX

GEAR CONCAVE

MEAN SPIRAL ANGLE

HAND

OF

SPIRAL

PINION OFFSET

DIRECTION OF OFFSET

PITCH DIAMETER (GEAR ONLY)

ADDENDUM (GEAR ONLY)

WORKING DEPTH

WHOLE DEPTH

THEORETICAL OUTSIDE DIAMETER

THEORETICAL CROWN TO BACK

PITCH ANGLE (GEAR ONLY)

ROOT ANGLE

FACE APEX TO CROSSING POINT

PITCH APEX TO CROSSING POINT (GEAR ONLY)

ROOT APEX TO CROSSING POINT

MEAN MEASURING ADDENDUM

MEAN MEASURING THICKNESS

MEAN MEASURING DEPTH

NORMAL BACKLASH WITH MATE

BACKLASH VARIATION TOLERANCE3

SHAFT ANGLE

FILLET RADIUS

RlJNOUT TOLERANCE3

PITCH TOLERANCE3

INDEX TOLERANCE3

TOOTH SURFACE TEXTURE

AGMA QUALITY CLASS

TOOTHFORM

DRI VING MEMBER

DIRECTION OF ROTATION

MFG SUMMARY NUMBER

PART NUMBER OF MATE

NUMBER OF TEETH IN MATE

xx

(XX.XXX)

(XX.XX )

(XX.XX )

(XX.XX )

LH OR RH

(X.XXX)

AC ORBC

(X.XXXX)

.xxx)2

(.XXXI2

( . xxx )2

x.xxx)2

( x . x x x ) 2

(XX.XX )

(XX.XX )

( . xxx )2

(.XXXI2

(.XXXI2

. xxx

.xxx-.xxx

.xxx-.xxx

.xxx-.xxx

.xxxx

.xxx-.xxx

(XX.XX )

.xxxx

. x xxx

. xxxx

XX AA OR

R a

xx

GENERATED OR

FORMATE@ OR

HELIXFORMB

PINION OR GEAR

CW AND/OR CCW

xxxxxx

x x x x x x

xx

V AND t i CHECK I N THOUSANDTHS OF AN INCH (OR HUNDREDTHS OF A MILL IMETER)

FOR FINISHED GEARS4

GEAR CONVEX

TOTAL HEEOE

EAR CONCAV'E

OTAL HEEL

OE

V

xx

x

xx

x

x

H

x x

xx

xxx

1. For metric drawings, specify module in place of diametral pitch. (See 5.9).

2. For metric drawings, the number of decimal places to the right of the decimal pcint should be reduced by one.

3. See 5.18.3, 5.23 , 5.2 4, 5. 25 an d 5.2 6 con cerning when to specify ihese values on the gear drawing.

4.

May be optional for matched sets. Specify on matched set drawing. See FI G. 8.

FIG. 7 D A T A SPECIFICATIONS FOR HYPO ID GEARS

8

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PART 2 FOR BEVEL AND HYPOID GEARS ANSI Y14.7.2-1978

4.8 Match ed Sets.

5.5 Tangent Plane. A plane tangent to the tooth sur-

4.8.1 Bevel and hypoid gears are frequen tly match ed

face at a point

Of contact . As used in the

in sets or pairs during sequence of the manufacturing

the

tangent piane is taken at the mean point-

Process. They aremaintained as a matc hed set in

5.6 Mean Point. The point on the intersection of the

assembly. See Figure

8.

too th surface with the pitch surface at the middle

of

4.8.2 Gear sets which have a comm on facto r in the the theoretica l face width of a bevel

or

hypoid gear.

toothnum bers of pinion and mating gear have a

See Figures

9

and 13.

specific marking

on

mating

teeth to 5.7 Tooth Trace.

Thefntersectionetween

of the gears as originally matched. See Figure

8.

the pitch surface an d the tooth surface. See Fieure 13.

4.8.3

Drawings for gears which operate as matched

sets shall contain the following note:

5.8 Diametral Pitch. The ratio of the number of teeth

to the pitch diametern inches. Unless otherwise spec-

THIS GEAR

IS

PART O F A MATCHED

ified , the transverse diametral pitc h specified in the

SET WITH MATE NO. XXXXXX.

transverse plane) is implied. For hypoid gears, it is the

EACH MATCHED SET IS TO BE MAIN-

transverse diametral pitch of the gear member.

TAINED AS A S ET AFT ER IDENTITY

5.9 Module Metric). The ratio of the pitch diameter

IS

DETERMINED. MARKED TEETH

in millimeters to the num ber of teeth . Unless othe r-

BLED AS SHOWN. transverse plane) is implied. For hypoid gears, it is the

NON-HUNTING) MUST

BE

ASSEM-ise specified, the transverse mo dule specified in the

transverse module o f the gear mem ber.

5 GEAR TOOTH NOMEN CLATUR E. The following

gear tooth nomenclature,is intended toamiliarize the

draftsm an with eneral terms used on thegear drawing.

Amore completeexplanationof erms, definitions

and llustrations is given in Ame rican National Sta n-

dard for Gear Nomenclature, ANSIlAGMA 112.05-

1976, published by the American G ear Manufacturers

Association, 1330 Massachusetts Avenue , N.W. Wash-

ington, D.C.

5. 10 Pressure Angle.

The angle at the pitch point be-

tween a line normal to the too th profile and th e pitc h

plane. See Figure 14. Unless otherwise specified for

bevel andhyp oid gears, the norma l pressure angle

measured in the norm al plane at the mean point) is

implied. The normal pressure angle is that angle in the

normal plane at the pitch point between the tangent

plane and a radial line to the gear center. On most

types of gears the pressure angles on bot h sides of the

5.1 Axial Plane.

A plane which contains the gear axis.

gear to oth profile are equal. An e xcep tion to this is in

Figure

9

illustrates the gear nomenc lature in the axial designs of gears with buttress teeth such as hypoids.

plane of a bevel gear and Figure 10 lower view) illus-

Hypoid gear teeth , because of their asym metric rela-

trates a view in the axial plane

of

a hypoid gear.

tionsh ip, do not naturally have equal pressure angles

on their tw o sides. With spiral bevel gears, the designer

5.2 Pitch Plane- A Plane tange nt o he gear Pitch may eliberately nbalance the pressure angles to

surface. For bevel gears, thePitch Plane is tang ent oproduce abuttressed too th. On spiral bevel and

theitch cone. hypoid gears, theeeth

are

cutith lengthwise

curva-

5.3 TransversePlane. A plane perpendicular to bo th

the axial plane and thepitc h plane. Figure illus-

trates he gear nome nclature in the transverse plane

ture. One too th surface is concave; the othe r is con-

vex. These two erms are used to dent ify he two

sides of the gear teeth. See Figure 13.

of a bevel gear. 5.11 Spiralngle. The angle between th eooth trace

5.4 Norm al Plane. A plane perpendicular to the pitc h

plane and containing a line norma l to the tooth

sur-

face at the pitch point . n bevel gears, it usually refers

to he plane which passes through the mea npoint

and an element

of

the pitch cone. See Figure

13.Un

less otherwise specified, the spiral angle is at the mean

point. On hypoid gears, the spiral angles on gear and

mating pinion are unequal.

the section at the cent er of the face width). Figure

5.12 Hand

of

Spiral. The direction of inclination of

12 illustrates the gear nomenclature in the normal

the teeth as viewed by an observer looking at the face

plane of a bevel gear.

of he gear. A eft-hand spiral is one in which the

9



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G E AR A N D S P L I N E D R A W I N G S T A N D A R D

P A R T

2 FOR

B E V E L A N D H Y P O I D G E A R S

outer half of t.he teeth are inclined in a counter clock-

wise direc tion; a right-hand spiral is one in which the

outer half of the te eth are inclined in a clockwise di-

rection. See Figure 15. With the excep tion of a few

relatively rare hypoid gear designs, a gear and mating

pinion have opposite hands of piral.

5.13

HypoidPinionOffset. Th e perpendicular dis-

tance between the axes

of

a hypoid gear set. Hypoid

gears and pinions, in Figure 15 a) a nd b) are referred

to as having a pinionoffset below cen ter, while

those in Figure 15 c). and d) have apinionoffset

above center. The direction of pinion offset is de-

termined where viewing the face of the gear with the

pinion at the r:ight.

5.14 Direction

of

Rotation. The direction

of

rotation

is determined where viewing the gear or pinion from

its back. The direction of rotation

of

gear and mating

pinion are eithe r clockwise or counterclockw ise and

always opposite to each other.

5.15 Tooth Form. The shape

of

the oot h profile.

Since bevel and h ypoid gears are manufa ctured with a

variety of tooth form s, t is essential to specify the

desired f orm on the gear drawing.

5.15.1

Generated.

A

tooth orm where both mem-

bers have too th profiles roducedwith relative

motion between thecutting ool and the work n

addition

to

the: cutting action.

5.15.2. Non-Generated.

A

tooth form where the gear

too th profile is produc ed without a generating motion

betw een the wtting tool and the work. The mating

pinion m ust be: generated.

5.15.3 CONIFLEXO.

A

trade nam e applied to gen-

era ted straight bevel gears whose tee th have lengthwise

crowning.

5.15.4

REVACYCLEO.

A

trade name pplied to

straight bevel gears produc ed with circular arc too th

profiles.

5.15.5 FORMATE@. A

trade nameapplied to

non-

generated spird and hypo id gears in which th e too th

profiles are straight. The matingpinions are generated

to be conjugate to the gears.

5.15.6 HELIX:FORM@. A trade name applied to

non-gene rated spiral bevel and hypo id gears in which

the too th surfaces are helicoidal in fo rm.

5.15.7 ZEROLO.

A

tradename applied to spiral

bevel gears with ero spiral angle at some point

a lo ng t he t o o ~ hength.

10

ANSI Y14.7.2-1978

5.16 Depthwise Tooth Taper. The difference in

tooth d epth at th e inner and outer ends of the teeth.

Standard depthwise tooth taper refers to gears in

which th e tooth dep th is pro[.

r t i rna l

to the distance

from the pitch apex. Zero depthwise aper refers to

teeth with constant depth. Frequen tly conical gears

are designed with tilted root lines.This generally

refers to a depthwise too th taper which

is

deeper at

the outer end

of

the tooth and shallower at the inner

end of the ooth han hat resulting fromstandard

taper. T ilting the root lines is don e o improve the

point width of the c utting ools.

5.17 Clearance. The space between the op land of

the tooth of one gear and the root land of the mating

gear. See Figures

11

and 12.

5.18 Backlash. The space between m ating tooth sur-

faces. For purposes of measurement and calculation ,

backlash is the amoun t by which the width of a too th

space exceeds the thickness of an engaging tooth.

Numerical values of backlash on bevel andhypoid

gears are measured at he ightest point of mesh on

the pitch circle at he outer end of the ooth with

gears assembled at their specified moun ting distances.

See Figure 12. Unless otherwisespecified, the term

backlash denotes normalbacklash; tha t is, backlash

measured in a direction perpendicular to he oot h

surface.

5.18.1

BacklashTolerance. The allowable

variation

in the backlash measured at the tightest point

o f

mesh

among all pairs of gears of a given population as a

result of oot h size variation. Backlash tolerance is

used as a con trol of tooth size in produc tion and is

specified on the drawing.

5.18.2

Backlash V ariation. The difference nback-

lash between the tightest and loosest points of mesh

in one pair of gears as a result of runo ut, inde x varia-

tion, and profile variation.

5.18.3 Backlash VariationTolerance.The.allowable

variation i n backlash in a single pair of gears. Backlash

variation tolerance is only specified if backlash varia-

tion is critical.

5.19 Circular Thickness. Th e eng th of arcbetween

the wo sides of a gear toothon hepitch circle.

Unless otherwise specified, it is the transverse circu-

lar thickness t theouter nds of the eeth. See

Figure 11 .



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P ART

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BE V E L AND HY P OI DGEARS

ANSI Y14.7.2-1978

5.2 0 Measuring Addendum. The height from the top

of he ooth o hechordsubtending he circular-

thickness arc in the norm al plane. The mean measur-

ing addendum is the value at the center of the tooth

length.

5.21 MeasuringThickness.

The length of thechord

subtending aircular-thicknessrc in the ormal

plane. The mean measuring thickness is the value used

at the centerof the too th length.

5.2 2 Mean Measuring D epth. The dep th of the tooth

at the centerof the tooth length.

5.23 Run out Tolerance. The total allowable variation

of

the distance between a surface of revolution and

an indicatedsurfacemeasuredperpendicular to he

surface of revolution. Unless otherwisespecified, it

refers to radial runo ut of the gear teeth ; tha t is, in a

direction perpendicular to the axis of gear rotatio n.

This value is specified on he drawing when AGMA

quality class numbers are not available.

5.24 PitchTolerance. The allowable differencebe-

tween the pitch and h e measured distance between

any two adjac ent teeth. This value is specified on the

drawing for gears of high accuracy requirement.

5.25 Index Tolerance. The allowable displacement of

any tooth from its theoretical angular or linear posi-

tion relative to a d atu m to oth . This value is specified

on the drawing for gears used for accura te positioning,

such as ind ex drives.

5.26 Compositeolerance.

Tooth-to-toothom-

posite olerance and otalcomposite tolerancemay

be specified in place

of

runout toleranceand pitch

tolerance for gears

of 2

diametral pitch andfiner.

These values are specified on thedrawing when AGMA

quality

class

numbers

are

no t available.

5.27 Tooth Surface Texture.

The texture of the fin-

ish on the working tooth surface

of

a gear tooth; ex-

pressed either as an arithmetical average deviation

AA) or an arithm etical mean deviation Ra).

5.28 AG M A Qua lity Class.

The classification num ber

established by the American Gear Manu facturers As-

sociation to designate the quality requirements of a

gear. See AGMA 390. 03 JAN ., 1973-AGMA GEAR

HANDBOOK, VOLUME 1 , GEAR

CLASSIFICA

TION, MATERIALS AND MEASURING METHODS

FOR UNASSEMBLED GEARS.

5.29

V

and H Check. A check used for produc tion

control of the ooth contact pattern on gears after

sample gears have been established which are known

to functio n properly in the ap plication. The V and H

che ck gives the relative vertical V) andhorizontal

H)displacements on a estingmachine to position

the tooth contact pattern at both the inner toe) and

oute r heel) end of the tooth while maintaining the

contactpatte rn in the middle of he ooth profile.

For control purposes, theoothontact attern

shouldduplicate thepatternon thesample pair

of

gears when similarly positioned in the testing machine .

These da ta are optio nal on a gear drawing and should

only be specified when a atisfactorydevelopment

has been achieved. See Figures

4

and 7.

5.30 FaceAngle -Distance. The perpendicular dis-

tance from the intersection of the gear axis with the

locating surface at the b ack of a bevel

or

hypoid gear

to the face cone elem ent. See Figures 9 and

10.

5.31 BackAngleDistance. The perpendicular dis-

tance from the intersection

of

the gear axis with the

locating surface at the back

of

a bevel o r hypoid gear

to the back cone element.

See

Figures 9 and

10.

11

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PART 2 FOR BEVEL. AND HYPOID GEARS

ANSI Y14.7.2-1978

Pinion and Gear to be

Matched in Pairs for Proper

Tooth Contact and

Backlash. Etch Serial

Number, Measured

Backlash and Measured

Mounting Distance

on These Surfaces.1

/

/ / .

Distance

C I X . X X X X l + P i n i o n

Mounting Oistance

DRIVING MEMBER PINION

OR

GEAR

DIRECTION OF ROT ATION CW AND/OR CCW

MFG x x x x x x

PART NUMBER OF DRIVER x x x x x x

PART NUMBER OF DRIVEN x x x x x x

V AND H CHECK IN THOUSANDTHS OF AN INCH OR HUNDREDTHS

OF

A MILLIMETER)

FOR FINISHED GEAR SET

GEARCONVEX

TOTAL

EEL

OE

EAR CONCAVE

OTAL

EEL

OE

V

x x

x x x

x

x

x

x x x x x x

x

x x x

MARKED TEETH MUST BE ASSEMBLED AS SHOWN

1. On even or m ultipl e ratios,

a

pair of meshing eeth should be etched

X

when in mesh in order that they may be

2. For metric drawsings, the number o f places to t he rig ht of the decimal p oint should be reduced by one.

assembled in the

same

running position as when manufactured. See Para.

4.8.2.

FIG. 8 DATA SPECIFICATIONS FOR BEVEL GEAR MATCHED SET

12

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GE A R A N D S P L I N E D R A W I N G S T A N D A R D

P A R T 2 FOR B E V E L A N D

HYPOID

GEARS

ANSI Y14.7.2-1970

Mounting Distance

1. The pitch apex and the root apex m ay or may not coincide depending on individual gear design.

2. See Figure 11 for developed view of A-A.

FIG.

9

B E V E L GE A R N OME N C L A T U R E - A X IA L P L A N E

13

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PART 2

FOR

BEVEL AND HYPOID GEARS

Pinion Mounting Distance

-4

ANSI Y14.7.2-1978

utside Diameter

IG. 10 H Y P OI D GE A R N OME N C L A T U R E - A X I A L P L A N E

14


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G E A R A N D S P L I N E D R A W I N G S T A N D A R D

P A R T 2

FOR

B E V E L A N D

HYPOID

GEA RS ANSI Y14.7 .2-1978

T , D e d e n d /

Distance

/.i

Circular Thickness

Top Land

Working DepthJ

I .

Root

Land

- Whole Depth .

Tooth Fi l let

Developed

View

at

A-A

See Fig. 9)

FIG.

11

BEVEL GEAR NOM ENCLATURE-TRANSVERSE PLANE AT OUTSIDE DIAMETER

15


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G E A R A N D S P L I N E D R A W I N G S T A N D A R D

P A R T 2

FOR

B E V E L A N D H Y P O I D G E A R S

I Measuring

Normal

Thickness

Backlash

I

Measured Whole Dep th A

Measuring Addendum

1

FIG. 12 BEVEL GEAR NOMENCLATURE-NORMAL PLANE AT THE MEAN POINT

Element of Pitch Cone

Mean Point of Tooth

Ctonvex Side of Tooth

Tooth Trace

7

Section Through Tooth

on Pitch Cone

Concave Side

of

Tooth

1 1

Trace of Tangent Plane

FIG. 13; MEAN SPIRAL ANGLE

FIG. 14 PRESSURE ANGLE

16



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PART 2

FOR

BE V E L AND HY P OI DGEARS

Offset

Offset

ANSI Y14.7.2-1978

b)

Offset

Below Center

LH

Pinion

R H

Gear

C )

Offset Above Center R H Pinion

LH

Gear

Offset

Offset

FIG. 15 H A N D

OF

SPIRAL AND P INION OFFSET

17

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ANSI Y14.7.2-1978

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