Jsae Jaso c713-1996

JAPANESE AUTOMOBILE STANDARD JASO C 713-96

Steering wheel for automobiles

1. Scope This standard specifies steering wheel for automobiles. Remark:

The following is applicable standards for this standard. JIS B 1602 : Involute Serrations JIS D 0032 : Symbols for controls, indicators and

tell-tales for automobiles JIS D 0205 : General rules of weatherability for

automobile parts JIS D 1061 : Steering control system laboratory

impact test JIS D 1201 : Test methods for flammability of

organic interior materials for automobiles

JASO C 710 : Test methods for steering column strength and rigidity

IS0 6487 : Road vehicles-measurement techniques in impact tests - Instrumen- tation

2. Performance 2.1 Durability Durability shall be conducted for evaluation on the basis of each test method written in 7.2 static strength test, 7.3 endurance test and 7.4 environmental resistance test, and shall satisfy performances specified by the agreement between parties concerned.

2.2 Safety 2.2.1 Impact characteristics Impact characteristics shall be conducted for evaluation on the basis of the test method written in 7.5 Impact safety test, and shall satisfy performances specified by the agreement between the parties concerned.

2.2.2 Flame resistance ability Flame resistance ability shall be in accordance with 6. Flammabily test in JIS D 1201, and shall satisfy performances specified by the agreement between the parties concerned.

2.2.3 Glare-proof ability The surface of steering wheel shall not have bright reflecting surface that obstructs the driv- er's view.

2.2.4 Surface projection The surface and operating part of steering wheel shall not have projection capable of injuring a human body in operating normally and in contact with a human body in an accident. Projections of accessories such as horn button shall not obstruct driving operation.

2.3 Mass and moment of inertia Mass and rotational moment of inertia shall be within the range that does not adversely affect controllability, safety and vibration characteristics of steering wheel.

3. Structure The structure of steering wheel monolithically consists of rim, spoke and hub, and is equipped with the operating pari of horn. The centers of rim, spoke and hub are reinforced in general with metallic materials and the outsides are molded by synthetic resin and synthetic rubber.

4. Shape and dimensions 4.1 Outside dimensions The outside diameter of rim of steering wheel and the cross-sectional dimension shall be within the range shown in Table 1. However, the outside diameter shall indicate length in the case of ovai-shaped steering wheel.

4.2 Installation method and dimensions 4.2.1 Installation method The methods of installing with steering shaft has two types of the installation by serration and taper metal, and serration only. Fig. 1 and 2 indicate an example.

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JAS0 C 713-96

Part

A

B

C

D

E Sectional view of grip

Table 1 Dimensions of outside profile

Name Dimensions

Outside diameter 360-500

Grip height (trough) 22- 34

Grip width 23- 30

Grip height (crest) 24- 35

Cone depth (reference) 87-1 56

Fig. 1 Installation by serration and taper metal Fig. 2 Installation by serration only

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JASO C 713-96

Part Name I

4.2.2 Dimensions of installation part Calculation method of specifications specified in Table 2 and 3 indicate dimensions for each JIS 6 1602 also are applied to modules other installation method. than the specified modules. Detailed dimensions of serration are in accor- However, deviation can be determined sepa- dance with JIS B 1602. rately as the case may be.

Dimensions

Table 2 Installation dimensions by serration and taper metal

17, 17.5, 18 Taper hole larger diameter

d 24, 24.8 18.3, 18.5, 18.7 19, 19.3, 19.8

F

Serration

Taper 115, 7/24 114, 115, 7/24 1/10

Module m 0.43, 0.47 0.43, 0.45,x 0.43, 0.63

Hi

N

Number of teeth z 30, 34, 36 32, 33, 36 32,36

Tooth profile Straight (or Involute)

Hub height 20, 24, 28 24, 27, 34.5 25, 29.7 29, 32, 34

Taper depth 7.3 - 12.5 1 1 -16

Puller hole screw dimensions

P

L

M8 X 1.25, MIO X 1.25

Serration length 4 - 20 10.5 - 20 Puller hole pitch 35, 45, 50, 55, 60, 65, 85

Remark : It is desirable that boldface dimensions are recommendable values, and unified to this dimensions in future.

Part Name

Serration Module m

Number of teeth z

Tooth profile

Table 3 Installation dimensions by serration only

Dimensions

0.43 0.45 0.5 0.75

36 32 29 20

Straight (or involute)

HT- I Hub height [ 20, 27, 27.5, 38

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JAS0 C 713-96

5. Appearance The surface of steering wheel has no defect such as crack, shrinkage cavity, harmful burr and color shade.

6. Material A variety of materiais such as polypropylene, vinyl chloride, polyurethane and cast wood shall be used for the surface material for rim part of steering wheel according to automobile specifications.

7. Test methods 7.1 Common test conditions

(1) Test piece for each test shall be n=3 unless otherwise specified.

(2) Each test shall be executed under the final assembly condition of steering wheel unless otherwise specified.

(3) Each test shall be executed at the room temperature and the room temperature shall be recorded unless otherwise specified.

(4) Installation of test piece for each test shall be executed on the basis of description on test devices shown in each item unless otherwise specified.

(5) Load jig for each test shall have a structure in which load except the specified load is not applied.

(6) There is ‘O to break down’ in test conditions for each test, but when it does not break down even if it reaches load established between parties concerned in advance or repeat number of cycles, tests can be stopped.

7.2 Static durability test 7.2.1 Static bending test This test shall be executed for evaluation of performance about bending durability and strength of steering wheel when weights are applied in driving and getting on or off to the steering wheel grip part. (1) Test arrangement (2) Test conditions

(a) Load direction: Load in the direction of the arrow as shown in Fig.3

(b) Load: O to break down(N) (c) Load speed: 30 to 60mm/min. (d) Load position: Wheel weakest part

(a) Install steering wheel to the testing

(b) Install Load jig to the testing device (c) Load at specified speed

(a) Load position (b) Load speed (c) Relational curve figure of load and de-

flection (See Fig. 4) (d) Breaking load (e) Breaking point and state (f) Presence or absence of other abnorma-

(3) Test procedures

device

(4) Measurement items and record

lities

7.2.2 Static torsion test This test shall be executed for evaluation of performance about torsion rigidity and strength of steering wheel.

Fig. 3 Arrangement for static bending test

Load m

Displacement gauge

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JAS0 C 713-96

Fig. 4 Relational curve of load and deflection

A t I Break down

.)

A

t Break down (d O

Deflection (mm)

(1) Test arrangement (2) test conditions

(a) Load direction: Load in the direction of the rim’s peripheral tangent as shown in Fig. 5.

(b) Load: O to break down(N) (c) Load speed: 30 to 60mm/min. (ci) Load position: Wheel’s weakest part

(a) Install jig on steering wheel (b) Install steering wheel to the testing

(c) Load at the specified speed (4) Measurement items and record

The same as 7.2.1 (4).

(3) Test procedures

device

7.2.3 Welding part strength test This test shall be executed for evaluation of petformance about weld strength in the welding part of steering wheel center metal. Test piece shall be taken by cutting steering wheel center metal. (1) Test arrangement (2) Test conditions

(a) Load direction: Load tensile weight as

(b) Load: O to break down(N) (c) Load speed: 5 to 20mm/min.

(a) Install each center metal to the jig. (b) Instali the test piece to the test device. (c) Load at the specified speed.

shown in Fig. 6.

(3) Test procedure

Fig. 5 Arrangement for static torsion test

Load point I

Load /

body

-

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o Rigid body jig

Ring

Rigid body jig Load

0

Fig. 6 Arrangement for welding part strength test

@ Ring and ring @J Ring and spoke Rigid body jig

Spoke ygd O H u b and spoke

(4) Measurement items and record (a) Load speed (b) Breaking load (c) Breaking point and state

@Hub plate and hub

1 plate

Hub/ ()Load

installation method by serration only (See Fig.2) is not tested. (1) Test arrangement (2) Test conditions

(d) Presence or absence of other abnorma- (a) Load method: Apply clamp torque to nut

(b) Clamping torque: 29N-m to break down (c) The oil sticking state on the taper con-

tact surface and the clamp speed shall be determined between the parties concerned.

Mies. as shown in Fig. 7.

7.2.4 Clamping test at installation part This test shall be executed for evaluation about the sunk amount of taper and break down strength by clamping a column shaft. However,

Fig. 7 Arrangement for clamping test at installation part

Clamping torque

Nut

Remark : Nut, washer and others, and column chafi on the actual car are used.

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JAS0 C 713-96

Installation angle Application

Fig. 8 Relational curve of clamping torque and sunk amount of taper

Displacement amount of load dl Contact angle a

- Amount of sunk (mm)

2 40"

<40 o Cab-over type car

(3) Test procedure 7.2.5 Static load test at spoke part This test shall be executed for evaluation about rigidity of the spoke part that may affect passenger's chest protection performance.

(a) Install steering wheel to column shaft. (b) Apply clamp torque to nut by the use of

torque wrench.

65 o 60mm or more

45 o 40mm or more

(4) Measurement items and record (1) Test arrangement (2) Test conditions (a) Oil sticking state

(b) Nut clamp speed (a) Load direction : (d) Relational curve figure of clamping

torque and sunk amount of taper (See Fig. 8)

(e) Breaking point and state (f) Presence or absence of other abnorma-

lities. Fig. 9 Arrangement for static load test at spoke part

Load jig (Flat plate).

Rigid body jig

Load in the direction of the arrow shown in Fig. 9. (load from the side of rigid body jig is acceptable)

w Displacement gauge

Except cab-over type car I ~ 30 " 80mm or more I I

Remark 1. Cab-over type car means that a half or more than the engine length of the car's entire length is located in the rear of the front end at the bottom end of front windshield.

2. See Fig. 10 for displacement amount of load dl . 7

JASO C 713-96

(b) Load conditions : Load up to displacement amuunt as shown in Fig. 9.

: 10 to 50mm/min. : Rim lower center position in the state of car’s straight running.

(c) Load speed (d) Load position

(3) Test procedures

device. (a) Install steering wheel to the testing

{b) Install load jig to the testing device. (c) load at the specified speed.

(4) Measurement items and record (a) Load position (b) Load speed (c) Relational curve of weight and displace-

ment amount (See Fig. 10)

7.2.6 Static load test of center pad This test shall be executed for evaluation about rigidity of the center pad that may affect the passenger’s head protection performance. However, steering wheel with air bags is ex- cluded. (1) Test arrangement (2) Test conditions

(a) Load direction : Load in the direction of the arrow as shown in Fig. 11.

(b) Load conditions : Load up to the displacement amount as shown in Fig. 11.

: 10 to 50mm/min. : Center of shaft axis.

(c) Load speed (d) Load position

(3) Test procedures (a) Install steering wheel to the testing

device.

(b) Install load jig to the testing device. (c) Load at the specified speed.



7.2.7 Static load test of rim part This test shall be executed for evaluation about rigidity of the rim part that may affect the passenger’s head protection performance. (1) Test arrangement (2) Test conditions

(a) Load direction : Load in the direction of the arrow as shown in Fig. 13.

(b) Load conditions: Load up to the displacement amount as shown in Fig. 13.

(c) Load speed (d) Load position : The center of upper

side rim in the state of car’s straight running.

: 1 O to 50mm/min.

(3) Test procedures (a) Install steering wheel to the testing

(b) Install load jig to the testing device. (c) Load at the specified speed.


device.


Fig. 10 Relational curve of weight and displacement. amount (Example)

O d l Displacement amount [mm]

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JASO C 713-96

Application

Fig. 11 Arrangement for static load test for center pad part

Displacement amount of load d2 Installation angle

Load jig (Semi- spherical

2 40"

<40 o

Cab-over type car

head

-

30mm or more

30mm or more

Except cab-over type car I ___ 40mm or more I

Fig. 12 Relational curve of weight and dispiacement amount (Example)

O d 2 Displacement amount [mm]

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JAS0 C 713-96

2 40"

<40 o Cab-over type car

a

30mm or more

70mm or more

8 Displacement

Fig. 13 Arrangement for static load test of rim part

I U Load foam of 165 in diameter) Load jig (Semi- cylindrical face

I

1/ I \/ Rigid body I I / jig

IL-- I I 1-

/ / / / / / / / / Y / / / / / / / /

Application Displacement amount of load d3 Installation angle I

80mm or more Except cab-over type car I ___ I

Fig. 14 Relational curve of weight and displacement amount (Example)

O d 3 Displacement amount [mm]

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JAS0 C 713-96

Fig. 15 Arrangement for bending resistance test

7.3 Durability test 7.3.1 Bending resistance test This test shall be executed for evaluation about bending resistance and strength of steering wheel. (1) Test arrangement (2) Test conditions

(a) Load direction : Load alternately and repeatedly as shown in Fig.15.

(b) Weight : 221N (c) Repeat speed : 1 to 1.67Hz (d) Load position : Wheel’s weakest posi-

(e) Load number : Up to break down (3) Test procedures

(a) Install jig to steering wheel. (b) Install steering wheel to the testing

(c) Load at the specified speed.

tion

device.

Load

V Load jig

(4) Measurement items and record (a) Load position (b) Repeat speed (c) Break down number or repeat number

before the test is stopped (d) Breaking point and state (e) Presence or absence of other abnorma-

lities

7.3.2 Torsional resistance test (2) Test conditions

(a) Load direction : Load repeatedly in the direction of peripheral tangent of rim part as shown in Fig. 16.

(b) Weight : 221N (c) Repeat speed : 1 to 1.67Hz (d) Load position : Wheel’s weakest posi-

(e) Load number : Up to break down tion

Fig. 16 Arrangement for torsional resistance test

Load point

id body

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JASO C 713-96

Load

Operation load

(3) Test procedures

(4) Measurement items and record The same as 7.3.1 (3).

The same as 7.3.1 (4).

Actual car horn or resistor

Whistling load (') + applied weight-equivalent (*)

(1) Test procedures (a) Horn circuit connection

(2) Measurement items and record (a) Abnormality of horn circuit

7.3.3 Applied vibration resistance test This test shall be executed in accordance with 5.4 (Methods of applied vibration resistance test) in JAS0 C 710 for evaluation about resistance performance when vibration is applied to steering column. However, items mentioned below (2) Test conditions are added in test procedures and record.

7.3.4 Horn contact point operation resistance

This test shall be executed for evaluation about voltage drop of horn contact point part

test

(1) Test arrangement

Fig. 17 Arrangement for horn contact point operation resistance test

Horn button

body

Table 4 Test conditions of horn contact point operation resistance

Item Specification I Voltage, Current, Load and Number

position I Based on the agreement between the parties in concerned

Intermittent time I ON - 1 second, OFF - 3 to 4 seconds

Operation speed

Note ('): Whistling load is a weight applied to the operation part when horn starts to sound.

4 - 6 cmis

('): Applied weight is a weight additionally applied to the operation part after horn starts to sound, and it is determined between the parties concerned.

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JAS0 C 713-96

15.5hrs

O.5hrs

7.5hrs

0.5hrs,

(3) Test procedures (a) Install steering wheel to column shaft (b) Connect the electric circuit under condi-

tions of Table 4 and apply repeatedly weights to horn pad and button.

(4) Measurement items and record (a) Record of each test condition in Table 4. (b) Relation of operation number and volt-

(c) Relation of operation number and opera-

(d) Relation of operation number and

(e) Operability and presence or absence of

age drop

tion

sounding weight

other abnormalities.

7.4 Environmental resistance test 7.4.1 Weatherability test This test shall be executed in accordance with 5.5 (Accelerated weathering test) in JIS D 0205 for evaluation about resistance ability for degra- dation from sunlight, temperature and moisture.

7.4.2 Heat resistance test This test shall be executed for evaluation about heat deformation of steering wheel at high temperature. (1) Test arrangement

Install steering wheel to column shaft and then set it in a constant temperature bath. The specification of the test device is not particularly specified.

(a) Temperature : 80 k 2°C (b) Time : 72hrs Remark :

(2) Test conditions

The test conditions (Temperature and time) can be changed depending on the place of destination on the basis of discussion between the parties concerned.

(3) Test procedures (a) Install the steering wheel connecting

horn circuit in the constant temperature bath of the specified temperature.

(b) After the specified time elapsed, remove it from the constant temperature bath.

(a) State of horn during test (sounding on) (b) Cracks, bubbles, blisters and defor-

mation of resin on the coated surface (c) Presence or absence of other abnorma-

lities

(4) Measurement items and record

7.4.3 Thermal shock test This test shall be executed for evaluation about deformation and crack generated on the steering wheel molded part caused by sharp change of temperature. (1) Test arrangement

Install steering wheel to column shaft and then set it in the constant temperature bath. The specification of testing device is not particu iarly specified.

Connect the horn circuit and test in the (2) Test conditions

order of (a) to (h). (a) Bath temperature

80 rf: 2°C (b) Room temperature

(c) Bath temperature

(d) Room temperature -4Ok 2°C

(e) Bath temperature 50 -t- 2°C 95%RH

(f) Room temperature

(9) Bath temperature

(h) Room temperature - 40 I 2 " C

( i ) Number of cycles

\

15.5hrs

O.5hrs

7.5hrs

Remark : The test conditions (Temperature and time) can be changed depending on the place of destination on the basis of discussion between the parties concerned.

(a) Install the steering wheel connecting horn circuit in the constant temperature bath of the specified temperature and then install steering wheel.

(b) Measure items mentioned below every specified cycle.

(3) Test procedures

(4) Measurement items and record (a) State of horn during test (Sounding on) (b) Deformation and crack of resin (c) Presence or absence of other abnorma-

lities

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JAS0 C 713-96

Fig. 18 Arrangement for low temperature bending test

7.4.4 Low temperature bending test This test shall be executed for evaluation about cracks, etc. or molded part in particular when load is applied to the steering wheel at low temperature. (1) Test arrangement (2) Test conditions

(a) Constant temperature: -30 k 2 OC 2hrs (no load)

(b) Load direction Load from the upper direction as shown in Fig.18.

(c) Weight : 490N (d) Load speed (e) Load position

Remark :

: 30 to 60mm/min. : Wheel’s weakest position

Test conditions (temperature and time) depending on the place of destination can be changed or the test can be omitted depending on the mold material on the basis of discussion between the parties concerned.

(3) Test procedures (a) Leave the steering wheel in unload

condition for the specified period in the low temperature bath of the specified constant temperature.

(b) Remove the steering wheel from the bath and immediately apply load.

(4) Measurement items and record (a) Load position (b) Load speed (c) Crack portion of molded part and the

(d) Presence or absence of other abnorma- state

lities

Load n Load jig

i l I

Rigid body jig - 71

/ / / / / / / i Displacement

gauge

7.5 Impact safety test 7.5.1 Impact absorption test This test shall be executed in accordance with JIS D 106 for evaluation about impact characteristics to a human body. However, items mentioned below are added to measurement items and record.

(a) Test data (generated weight and photo-

(b) Break down, dislocation and falling of the part forming the wheel face (surface) such as rim and horn pad of steering wheel.

(c) Projection of fracture surface caused by failure of spoke and arm.

(d) Presence or absence of other abnormalities

graph)

7.5.2 Head foam style impact absorption test This test shall be executed for evaluation about energy absorption ability required for steering wheel in the instance of collision. However, evaluation is made by steering wheel body alone (rigid). (1) Test equipment

(a) The test equipment consists of a rigid, fully-guarded linear collision equipment with 6.8kg of mass. The collision surface shall be semi-spherical and 165mm in diameter (See Fig. 19).

(b) The jig fixing steering wheel is that when a 800DaN of weight is applied to gen- erate a 16OdaN.m of force at B point, displacement in all directions at A point shall not exceed 2mm. (See Fig. 20)

(c) The measurement equipment is used in conformance with IS0 6487.

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JASO C 713-96

Fixed jig

B

(2) Test conditions (a) Set angle of steering wheel: The surface

of steering wheel shall be vertical against the direction of collision.

(b) Collision speed : 24.1 km/h or more (c) Collision position : The center of hub.

A joint point of spoke with highest rigidity and rim. A center point of the shortest rim part ex- cluding spoke. If there are any dis- advantageous posi- tions from a safe point of view, add them.

(d) Accelerometer : Two pieces on the head foam.

(e) Test temperature: 20 k 5 "C

1oümm or more

V

(f) Deployment of air bags : In the case of air bags, bags should be deployed as a rule. However, the test can be executed with bags unde- ployed.

(a) Install steering wheel to fixed jig. (b) Get the head foam of the test equipment

come to collision against the specified position to measure items mentioned below.

(3) Test procedures

(4) Measurement items and record (a) Test data (collision speed and decel-

eration)

I \\

Fig. 19 Head foam style impact absorption test equipment

7 collision

Fig. 20 Fixed jig test method

0 Load 200mm -

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JASO C 713-96

(b) Break down, dislocation and falling of the part forming the wheel face (surface) such as rim and horn pad of steering wheel

(c) Projection of fracture surface from breakage of spoke and arm

(d) Falling of steering wheel caused by fracture of installation part of steering wheel

(e) Presence or absence of other abnormalities

8. Indication The following items of steering wheel shall be indicated. (1) An identification mark indicating horn in

accordance with JIS D 0032 on the operating part of horn.

(2) Material (3) Date of manufacture or the abbreviation.

Applicable standards : JIS D 0204 JIS D 1050

tests-Instrumentation JIS D 1601 JASO M 312 : Test methods for plastic molded parts

: Method of high and low temperature test for automobile paris : Road vehicles-Techniques of measurement in impact

: Vibration testing method for automobile parts

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JAS0 C 713-96

In the event of any doubt, $he original standards in Japanese should be reTerred.

a : THIRD PHASED STANDARD

(The standard where SI units and newly values are given and do not using

customary units, but it is excepted that the standards are represented in only

accustomed metric units as m, A, Hz etc.)

Established by the Standard Council of JSAE

Date of Establishment : 1983-03-1 7

Date of Revision : 1996-03-29

Sub Committee in which the draft was made : SC of Steering

Technical Committee under which the draft was discussed : TC of Chassis

Investigating Cornmittee : Standard Cornmittee under the Standard Council

Pubfished by The Society of Automotive Engineers of Japan, Inc.

Goban-Cho, Chhiyoda-ku, Tokyo 102, Japan

This printed matter has been prepared with financial support from the Japan Auto-Race Organization.

Jsae Jaso c713-1996

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