Bosch Rexroth A7VO 63 Series Bedienungsanleitung

RE 92202/02.2015, Bosch Rexroth AG

Characteristics

▶ Variable pump with axial tapered piston rotary group of

bent-axis design, for hydrostatic drives in open circuit

▶ For use in mobile and stationary applications

▶ Flow is proportional to the drive speed and displace-

ment.

▶ The ﬂow can be steplessly changed by adjusting the

bent axis.

▶ Wide selection of control devices

▶ Compact, robust pump with a long service life

▶ Sizes 28 to 160

▶ Nominal pressure 350bar

▶ Maximum pressure 400bar

▶ Open circuit

Axial piston variable pump

A7VO Series 63

RE 92202

Edition: 02.2015

Replaces: 05.2012

Ordering code 2

Hydraulic ﬂuids 4

Shaft seal ring 5

Flow direction 5

Operating pressure range 6

Technical data 7

LR – Power controller without power override 9

LA1 – Power controller with hydraulically

proportional power override 13

DR – Pressure controller 15

HD – Proportional hydraulic control 18

EP – Proportional electric control 20

Dimensions, size 28 21

Dimensions, size 55 24

Dimensions, size 80 28

Dimensions, size 107 32

Dimensions, size 160 36

Connector for solenoids 40

Installation instructions 41

Project planning notes 42

Safety instructions 42

Contents

Bosch Rexroth AG, RE 92202/02.2015

2A7VO Series 63 | Axial piston variable pump

Ordering code

01 02 03 04 05 06 07 08 09 10 11 12 13

A7V O / 63 – V B 01

Axial piston unit

01 Bent-axis design, variable, nominal pressure 350 bar, maximum pressure 400 bar A7V

Operating mode

02 Pump, open circuit O

Size (NG)

03 Geometric displacement Vg(cm3), see “Technical data” on page 7 28 55 80 107 160

For sizes 250, 355 and 500, see data sheet 92203

Control device 28 55 80 107 160

04 Power controller without power override ●●●●● LR

with pressure cut-oﬀ ●●●●●LRD

with stroke limiter negative control Δp = 25 bar –●●●●LRH

with pressure cut-oﬀ and stroke limiter negative control Δp = 25 bar –●●●●LRDH1

with pressure cut-oﬀ and load sensing – ● ● ● ● LRDS

Power controller with hydraulically proportional power override

(only available for clockwise rotation and with port plate 02)

with load sensing – ● ● – – LA1S

with load sensing and hydraulically proportional LS-override – ● ● – – LA1S5

Pressure controller ●●●●●DR

remotely controlled ●●●●●DRG

with load sensing –●●●●DRS

Proportional control hydraulic Positive control Δp = 10 bar ●●●●●HD1

with pressure cut-oﬀ, remotely controlled Positive control Δp = 10 bar ●●●●●HD1G

Proportional control electrical Positive control U= 24 V ● ● ● ● ● EP2

Series

05 Series 6, index 3 63

Direction of rotation 28 to 160

06 Viewed on drive shaft clockwise ●R

counter-clockwise ●L

Sealing material

07 FKM (ﬂuoroelastomer) V

Drive shaft 28 to 160

08 Splined shaft DIN 5480 ●Z

Parallel keyed shaft according to DIN 6885 ●P

Mounting ﬂange

09 ISO 3019-2; 4-hole B

Port plate for working lines

10 SAE ﬂange ports A and S at rear (metric fastening thread) 01

SAE ﬂange ports A and S at side (available for power controllers LA1S and LA1S5 only, metric fastening thread) 02

● = Available –= Not available = Preferred program

RE 92202/02.2015, Bosch Rexroth AG

Axial piston variable pump | A7VO Series 63

Ordering code

1) Connectors for other electric components may diﬀer

01 02 03 04 05 06 07 08 09 10 11 12 13

A7V O / 63 – V B 01

Connector for solenoids1) (see page 40)

11 Without connector (without solenoid, with hydraulic control only; without code)

DEUTSCH molded connector, 2-pin – without suppressor diode P

Standard / special version

12 Standard version (without code)

Special version -S

● = Available –= Not available = Preferred program

Notes

▶ Note the project planning notes on page42!

▶ Preservation:

– Up to 12 months as standard

– Up to 24 months long-term

(state in plain text when ordering)

Bosch Rexroth AG, RE 92202/02.2015

4A7VO Series 63 | Axial piston variable pump

Hydraulic ﬂuids

The A7VO variable pump is designed for operation with HLP

mineral oil according to DIN 51524.

Application instructions and requirements for hydraulic

ﬂuids should be taken from the following data sheets

before the start of project planning:

▶ 90220: Hydraulic ﬂuids based on mineral oils and

related hydrocarbons

▶ 90221: Environmentally acceptable hydraulic ﬂuids

▶ 90222: Fire-resistant, water-free hydraulic ﬂuids

(HFDR/HFDU)

▶ 90223: Fire-resistant, water-containing hydraulic ﬂuids

(HFC, HFB, HFAE, HFAS)

Details regarding the selection of hydraulic ﬂuid

The hydraulic ﬂuid should be selected such that the

operating viscosity in the operating temperature range is

within the optimum range (νopt, see selection diagram).

Note

At no point of the component may the temperature be

higher than 115 °C. The temperature diﬀerence speciﬁed in

the table is to be taken into account when determining the

viscosity in the bearing.

If it is not possible to maintain the conditions above due to

extreme operating parameters, we recommend ﬂushing the

case at port U.

Viscosity and temperature of hydraulic ﬂuids

Viscosity Temperature Comment

Cold start νmax≤1600mm2/s θSt≥-40°C t≤3min, n≤1000rpm, without load p≤50 bar

Permissible temperature diﬀerence ΔT≤25K between axial piston unit and hydraulic ﬂuid in the system

Warm-up phase ν<1600 to 400mm2/s θ=-40°C to -25°C at p≤0.7×pnom, n≤0.5×nnom and t≤15min

Continuous operation ν=400 to 10mm2/s This corresponds, for example on the VG46, to a temperature

range of +5°C to +85 °C (see selection diagram)

θ=-25°C to +103°C measured at port R1/R2

Note the permissible temperature range of the shaft seal

(ΔT=approx.12K between the bearing/shaft seal and port R1/R2)

νopt=36 to 16mm2/s Range of optimum operating viscosity and eﬃciency

Short-term operation νmin≥7mm2/s t<3min, p<0.3×pnom

▼ Selection diagram

-40 -25 -10 10 30 50 90 11570

100

200

400

600

1000

1600

VG 22

VG 32

VG 46

VG 68

VG 100

Range of optimum operating viscosity vopt

Optimum eﬃciency

Maximum permissible viscosity for cold start

Minimum permissible viscosity for short-term operation

Temperature θ[°C]

Viscosity v[mm2/s]

Continuous operation

Warm-up phase

Minimum permissible temperature for cold start

RE 92202/02.2015, Bosch Rexroth AG

Axial piston variable pump | A7VO Series 63

Shaft seal ring

Filtration of the hydraulic ﬂuid

Finer ﬁltration improves the cleanliness level of the hydrau-

lic ﬂuid, which in turn increases the service life of the axial

piston unit.

A cleanliness level of at least 20/18/15 is to be maintained

according to ISO 4406.

At very high hydraulic ﬂuid temperatures (90°C to maxi-

mum 103°C, measured at portR1/R2) a cleanliness level is

necessary of at least 19/17/14 according to ISO 4406.

Leakage

The case interior is connected to the suction chamber. A

separate case drain line from the case to the reservoir is

therefore not required (both Rports are plugged).

Exception: For versions with pressure controller or pressure

cut-oﬀ, a drain line is needed to relieve port T1to the

reservoir.

Shaft seal ring

Permissible pressure loading

The service life of the shaft seal is inﬂuenced by the speed

of the axial piston unit and the leakage pressure in the

housing (case pressure). Momentary pressure spikes

(t<0.1s) up to 10bar are allowed. The service life of the

shaft seal decreases with increasing frequency of pressure

spikes and increasing mean diﬀerential pressure.

The case pressure must be equal to or higher than the

ambient pressure.

20000 4000 6000

Diﬀerential pressure ∆p [bar]

Rotational speed n[rpm]

NG107

NG160

NG28

NG55

NG80

The FKM shaft seal ring may be used for leakage

temperatures from -25°C to +115°C. For application cases

below -25 °C, an NBR shaft seal is required (permissible

temperature range: -40 °Cto+90°C).

Flow direction

Direction of rotation, viewed on drive shaft

clockwise counter-clockwise

Sto B S to A

Bosch Rexroth AG, RE 92202/02.2015

6A7VO Series 63 | Axial piston variable pump

Operating pressure range

Pressure at working port A or B (high-pressure side) Deﬁnition

Nominal pressure pnom 350 bar absolute The nominal pressure corresponds to the maximum design

pressure.

Maximum pressure pmax 400 bar absolute The maximum pressure corresponds the maximum operating

pressure within the single operating period. The sum of the single

operating periods must not exceed the total operating period.

Single operating period 10s

Total operating period 300 h

Minimum pressure (high-pressure side) 10 bar absolute Minimum pressure on high-pressure side (A or B) required to

prevent damage to the axial piston unit.

Rate of pressure change RAmax 16000bar/s Maximum permissible rate of pressure build-up and reduction

during a pressure change over the entire pressure range.

Pressure at suction port S (Inlet)

Minimum pressure pSmin 0.8 bar absolute

Minimum pressure at suction port S(inlet) that is required to avoid

damage to the axial piston unit. The minimum required pressure is

dependent on the speed and displacement of the axial piston unit

(see diagram on page 7).

Maximum pressure pSmax 2bar absolute

▼ Rate of pressure change RAmax

pnom

∆t

∆p

Time t

Pressure p

▼ Pressure deﬁnition

Pressure p

t2tn

Single operating period

Minimum pressure (high pressure side)

Maximum pressure pmax

Nominal pressure pnom

Time t

Total operating period = t1+ t2+ ... + tn

Note

Operating pressure range valid when using hydraulic

ﬂuids based on mineral oils. Values for other hydraulic

ﬂuids, please contact us.

RE 92202/02.2015, Bosch Rexroth AG

Axial piston variable pump | A7VO Series 63

Technical data

Size NG 28 55 80 107 160

Displacement, geometric, per revolution Vg max cm328.1 54.8 80 107 160

Maximum rotational

speed1)

At Vg max nnom rpm 3150 2500 2240 2150 1900

At Vg < 0.74 × Vg max nmax1 rpm 4250 3400 3000 2900 2560

Maximum rotational

speed2)

nmax2 rpm 4750 3750 3350 3200 2850

Flow At Vg max and nnom qvl/min 89 137 179 230 304

Power At Vg max, nnom and Δp=350bar PkW 52 80 105 134 177

Torque At Vg max and Δp = 350 bar TNm 156 305 446 596 891

Rotary stiﬀness Vg max to Vg /2 cmin kNm/rad 5 10 16 21 36

Vg /2 to 0 (interpolated) cmax kNm/rad 16 32 49 67 104

Moment of inertia rotary group JGR kgm² 0.0042 0.0042 0.0080 0.0127 0.0253

Maximum angular acceleration αrad/s² 35900 31600 24200 19200 15300

Case volume Vl 0.5 0.75 1.2 1.5 2.4

Weight (approx.) mkg 17 25

40 49 71

▼ Maximum permissible speed (limit speed)

0.6 0.7 0.8 0.9 1.0

2.3

2.0

1.8

1.6

1.4

1.2

1.1

1.0

0.9

0.8

1.9

1.7

1.5

1.3

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

Displacement Vg/ Vg max

Speed n/ nnom

Inlet pressure pabs

Determining operating characteristics

Flow qv=Vg×n ×ηv[l/min]

1000

Torque T= Vg×Δp [Nm]

20 × π× ηmh

Power P=2 π× T× n=qv×Δp [kW]

60000 600 × ηt

Key

Vg= Displacement per revolution [cm3]

Δp = Diﬀerential pressure [bar]

n= Rotational speed [rpm]

ηv= Volumetric eﬃciency

ηmh = Mechanical-hydraulic eﬃciency

ηt=Total eﬃciency (ηt= ηv× ηmh)

Notes

▶ Theoretical values, without eﬃciency and tolerances;

values rounded

▶ Operation above the maximum values or below the

minimum values may result in a loss of function, a

reduced service life or in the destruction of the axial

piston unit. Other permissible limit values, such as

speed variation, reduced angular acceleration as a

function of the frequency and the permissible angular

acceleration at start (lower than the maximum angular

acceleration) can be found in data sheet 90261.

1) The values are valid:

‒ At absolute pressure pabs = 1bar at suction port S

‒ For the optimal viscosity range of νopt=36 to 16 mm2/s

‒ For hydraulic ﬂuid based on mineral oils.

2) Maximum rotational speed (speed limit) for increased inlet

pressure pabs at suction port Sand Vg< Vg max, see diagram.

Bosch Rexroth AG, RE 92202/02.2015

8A7VO Series 63 | Axial piston variable pump

Technical data

Permissible radial and axial forces of the drive shaft

Size NG 28 55 80 107 160

Drive shaft Ø mm 25 30 35 40 45

Maximum radial force1)

at distance a (from shaft

collar) a

FqFq max N 6436 7581 10266 13758 18278

a mm 14.0 17.5 20.0 22.5 25.0

Maximum torque at Fq max Tq max Nm 179 281 444 681 1019

Maximum diﬀerential pressure at Vg max and

Fqmax

Δpq max bar 400 322 349 400 400

Maximum axial force at

standstill or pressure-

free operation

–

Fax

+Faxmax N 0 0 0 0 0

−Faxmax N 315 500 710 900 11250

Permissible axial force per bar operating pressure +Faxperm/bar

N/bar

4.6 7.5 9.6 11.3 15.1

Eﬀect of radialforce Fqon the service life of bearings

By selecting a suitable direction of radial force Fq, the load

on the bearings, caused by the internal rotary group forces

can be reduced, thus optimizing the service life of the

bearings. Recommended position of mating gear is depen-

dent on direction of rotation. Example:

Note

▶ The permissible axial force in direction −Fax is to be

avoided, because thereby the bearing life is reduced.

▶ Special requirements apply in the case of belt drives.

Please contact us.

▼ Gear drive

1 “Clockwise” rotation, pressure at port B

2 “Counter-clockwise” rotation, pressure at port A

1) With intermittent operation

RE 92202/02.2015, Bosch Rexroth AG

Axial piston variable pump | A7VO Series 63

LR – Power controller without power override

The power controller regulates the displacement of the

pump depending on the operating pressure so that a given

drive power is not exceeded at constant drive speed.

The precise control with a hyperbolic control characteristic,

provides an optimum utilization of available power.

The operating pressure acts on a rocker via a measuring

spool which moves with the control. An externally adjust-

able spring force counteracts this, it determines the power

setting.

If the operating pressure exceeds the set spring force, the

control valve is actuated by the rocker and the pump swiv-

els back from the initial position Vgmax toward Vgmin. When

doing this, the lever length at the rocker shortens and the

operating pressure may rise in the same proportion as the

displacement reduces without the drive power being

exceeded (pB×Vg=constant; pB=operating pressure;

Vg=displacement).

When depressurized, the pump is swiveled to its initial

position to Vg max by a return spring.

The hydraulic output power (characteristic LR) is inﬂu-

enced by the eﬃciency of the pump.

▶ Beginning of control, setting range 50 to 220bar

When ordering, state in plain text:

▶ Drive power P[kW]

▶ Drive speed n[rpm]

▶ Maximum ﬂow qv max [l/min]

Please contact us if you need a power diagram.

▼ Characteristic curve LR

220 bar

50 bar

Vg min displacement Vg max

Operating pressure pB[bar]

▼ Schematic LR

B(A)

UR1

Vg min

Vg max

Bosch Rexroth AG, RE 92202/02.2015

10 A7VO Series 63 | Axial piston variable pump

LR – Power controller without power override

LRD – Power controller with pressure cut-oﬀ

The pressure cut-oﬀ is a pressure control which adjusts the

displacement of the pump back to Vg min after reaching the

set pressure command value.

This function overrides the power controller, i.e. the power

control function is executed below the pressure command

value.

Pressure cut-oﬀ is preset to a pressure command value at

the factory.

▶ Setting range 200 to 350 bar

When ordering, state the setting in plain text.

Notes

▶ The pressure setting of the pressure cut-oﬀ must be at

least a factor of 5 higher than the beginning of control

of power control.

Example:

– Beginning of control of the power controller: 50bar

– Minimum setting of pressure cut-oﬀ:

5×50=250bar

Higher settings of the pressure cut-oﬀ are always

possible.

▶ For versions with pressure cut-oﬀ, a drain line is

needed from port T1to the reservoir.

When port T1is plugged and ttank≤50°C, this results

in a permissible pressure cut-oﬀ of≤2 min.

▶ Any pressure-relief valve included in the system to limit

the maximum pressure must have its start of opening

at least 20 bar above the pressure cut-oﬀ setting.

▼ Characteristic curve LRD

350

200 min

max

Vg min displacement Vg max

Operating pressure pB[bar]

▼ Schematic LRD

B(A)

UR1

Vg min

Vg max

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