Axial Piston Pumps for Commercial Vehicles from … · Through drive possibility No through drive 9...

15/04/2015 | Geert Geven - DCBN/SLM | Kramp Training A17-18VO/FO-A2F | Bosch Rexroth AG 2015. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.

Axial Piston Pumps for Commercial Vehicles from Bosch Rexroth

Geert Geven(DCBN/SLM)

1


Overview - Truck pump A17/A18

Model A17FO (KFA) A17FNO A17VO (KVA) A18VO A18VLO

Designfix displacementmiddle pressure

fix displacementlow pressure

variable displacement

middle pressure

variable displacementhigh pressure

variable displacementhigh pressure

(long-life)

Size 23, 32, 45, 63,80, 107 125 55, 80, 107 55, 80, 107 80

Speed(min-1) 2000 - 3050 1750

2500, 2240,2150

2500, 2240,2150 2240

Pressure(bar) 300 / 350

New ! 350 /400250 / 300 300 / 350 350 / 400 350 / 400

Weight(kg)

5,9 15 15 16, 21, 25 16, 21, 25 24,4

Data Sheet RE 91520 RE 91510 RE 92260 RE 92270 RE 92280

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Working PrincipalBent Axis versus Swash Plate

high relative movement

V = 40 km/h(A4VG125, 2200 min-1)

sensitive to contamination

bent axis

no relative movement

V = 0

robust towards contamination

swash plate

3



Swashplate Bent axis Through drive possibility No through drive

9 piston: => lower pulsation => lower noise level

7 piston

Suction port separated from leakage => transport of heated oil to reservoir

Common or separated suction and leakage port

Filtration requirement 10 20 Filtration requirement 40

Hydrostatic force-compensation => lower friction

No hydrostatic force-compensation

Axial forces are taken up in the housing => higher lifetime

Axial forces taken up by roller bearings => lower lifetime

Torque transmission on cylinder => cross forces on piston

Torque transmission on rotary flange => no cross forces on piston

Not sensitive against rotating-oscillation Sensitive against rotating-oscillation

Nearly identical efficiency Nearly identical efficiency

Lower speeds in standard version Higher speeds

Small swivel angle (15) Large swivel angle (VO = 26,5, FO = 40)

Easy change of flow direction Change of flow direction requires big space

Very low swivel time (lower masses) => high dynamic

Large swivel time, (high masses): =>low dynamic

Swashplate

Bent axis

4

Swashplate

Bent axis

Through drive possibility

No through drive

9 piston:=> lower pulsation=> lower noise level

7 piston

Suction port separated from leakage=> transport of heated oil to reservoir

Common or separated suction and leakage port

Filtration requirement 10 20

Filtration requirement 40

Hydrostatic force-compensation=> lower friction

No hydrostatic force-compensation

Axial forces are taken up in the housing=> higher lifetime

Axial forces taken up by roller bearings=> lower lifetime

Torque transmission on cylinder=> cross forces on piston

Torque transmission on rotary flange=> no cross forces on piston

Not sensitive against rotating-oscillation

Sensitive against rotating-oscillation

Nearly identical efficiency

Nearly identical efficiency

Lower speeds in standard version

Higher speeds

Small swivel angle (15)

Large swivel angle (VO = 26,5, FO = 40)

Easy change of flow direction

Change of flow direction requires big space

Very low swivel time (lower masses)=> high dynamic

Large swivel time, (high masses):=>low dynamic


Axial piston unit A17FO/VO

Basics: Bent axis design

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6


Axial piston unit A17VO . VO

Basics: Bent Axis Design

Self centering rotary group Spherical Cylinder One piece conical piston Tapered roller bearing Automatical bearing lubrication Hydrostatical relief

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8



Basics: hydrostatic Relief

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Parts:Control lense, Piston with pistonrings

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A17FO

11

ISO 7653 Mounting flangeDIN ISO 14 Drive shaft



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13



14



15



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A17FOFeatures/application Compact design for use in commercial

vehicles High power density with small

dimensions Direction can easily be changed Good self-suction characteristics Low noise level

Nominal pressure 300 bar 350 barMaximum pressure 350 bar 400 bar

A17FO Series 10Sizes 23, 32, 45,

63, 80, 107

Data sheet RE 91520

2D + 3D-Model

17



A17FNOFeatures/application Compact design for use in commercial

vehicles High power density with small

dimensions Direction can easily be changed Good self-suction characteristics Low noise level

Nominal pressure 250 barMaximum pressure 300 bar

A17FON Series 10Sizes 125

Data sheet RE 91510

2D + 3D-Model

18



A17FO / A17FNOApplications, Example

A17FO

DumperOpen Centre

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A17FO / A17FNOSimply change of rotational direction

Standard Design counter-clockwise rotation

Tank

Pressure

side

Pressure stud

Power-take-offclockwise rotation

Power-take-offcounter-clockwise rotation

Conversion toclockwise rotation

Tank

Pressure

side

Pressure stud

20



Truck pump:Weight optimized pump housing ( Aluminium alloy)

Splined shaft ( DIN ISO 14-LKW) PTO

Special flange ( ISO7653-1985-LKW)

124mm ( 107cc)117mm ( 80cc)110mm ( 55cc)

21



Type codeData RE 92260 /01.11

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Parts

1 Drive shaft2 Pump housing3 Piston4 Cylinder5 Controller6 Control lense7 Port plate8 Control piston

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Basic function: hydraulic displacement

Control valve

Systempressure

Area ratio: 2:1

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Basic function: displacement control

25



Basic function: LS with pressure controller

26

Pressure controller

Flow controller




Pressure controller

Flow controller

27




Pressure controller

Flow controller

28




Pressure controller

Flow controller

29




Pressure controller

Flow controller

30




Pressure controller

Flow controller

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32




33




34



Basic function:EP controller

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Basic function:EP2 controller

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37




38



A17VOFeatures Variable pump for commercial vehicles Mounting on power take-off Compact design Low mass torque High self-suction capabilityApplication Truck-mounted loader cranes


A17VO Series 11Sizes 55, 80, 107Controllers DRS, EP2, EP6

Data sheet RE 92260

2D + 3D-Model

39



A18VOFeatures Mounting on power take-off Designed for high pressure (A17VO pressure increased by 50 bar) Controller: DRS, EP (new ED/ mid.2015)Application Truck loader cranes and bodies Variable pump for Commercial vehicles


A17VO Series 11Sizes 55, 80, 107Controllers DRS, EP2, EP6

Data sheet RE 92270

2D + 3D-Model

40



A18VLOFeatures Variable pump for

commercial vehicles Mounting on power take-off Designed for high requirements Proven design features of the A17VO and

A18VOApplication Concrete mixer


A17VO Series 11Sizes 80Controllers DRS

Data sheet RE 92280

2D + 3D-Model

41



A17VO / A18VOApplications, Example

A18VO

Knuckle boom craneClosed Centre

42



Load-Sensing System - AdvantageThrottle control with

fixed displacement pumpLoad-sensing-control withvariable deplacement pump

Power loss

Power loss

Effe

ctiv

e ca

paci

ty L

oad

Effe

ctiv

e ca

paci

ty L

oad

43



Load-Sensing Systemflushing line

Suction linewater trap

tank line

max

min

Load sensing line

Pressure line

44



Load-Sensing SystemPrinciple Circuit Diagram

LS-controlblock

pump A17VO107DRS

measuring and control points

45



Load-Sensing Control-System - radio controlled

variable pump A17VO

LS-valve

3rd boom

grabber

winch

main boom

out trigger

2nd boom

slewing

Tipper valvewith pressure

cut-off

46



Thank you for your attention

47

Slide Number 1Slide Number 2Working PrincipalBent Axis versus Swash PlateSlide Number 4Basics: Bent axis design Basics: Bent Axis Design Basics: hydrostatic Relief Slide Number 10A17FO A17FOA17FNOA17FO / A17FNOApplications, ExampleA17FO / A17FNOSimply change of rotational directionSlide Number 21Type codePartsSlide Number 24Slide Number 25Slide Number 26Slide Number 27Slide Number 28Slide Number 29Slide Number 30Slide Number 31Slide Number 32Slide Number 33Slide Number 34Slide Number 35Slide Number 36Slide Number 37Slide Number 38A17VOA18VOA18VLOA17VO / A18VOApplications, ExampleLoad-Sensing System - AdvantageLoad-Sensing SystemLoad-Sensing SystemLoad-Sensing Control-System - radio controlledThank you for your attentionAC-generator control system with LS-pumpBehaviour of AC-gen. system with LS-pumpAC-generator control system with EP-pumpAC-generator control system with EP-pumpAC-generator control system with EP-pumpProperties of AC-generator control system with EP-pumpDC-generator system with EP-pumpSlide Number 55Slide Number 56Slide Number 57Slide Number 58Slide Number 59Slide Number 60

Axial Piston Pumps for Commercial Vehicles from … · Through drive possibility No through drive 9...

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