🔍

Variable Axial Piston Pump A11VO

1.Variable displacement pump with axial piston drive swashplate design for hydrostatic drives in open circuits

2.Design primarily for use in mobile applications

3.Pump operation either self-priming,with tank charging or charging pump

4.A comprehensive range of varialble units is available for different control functions

5.Power can be adjusted from the outside , even when the machine is running

6.The through drive is suitable for attachment of gear pumps and axial piston pumps up to the same size , i.e.100% through drive

7.The Volume flow is adjustable in proportion to the dirve speed and displacement and is infinitely variable from QVmax to QvMin=0

Detailed description

The axial piston variable pump A11VO is a robust and versatile hydraulic component engineered for demanding hydrostatic drive systems, particularly those found in mobile applications. At its core, this pump utilizes a variable displacement design with an axial piston drive featuring a swashplate configuration. This fundamental design allows for precise and efficient flow control, making it highly suitable for open circuit hydrostatic drives where adaptability is key.

One of the primary advantages of this pump is its operational flexibility. It can function effectively in several modes, including self-priming operation, or it can be used in systems with tank charging or an integrated charging pump. This adaptability simplifies system design and allows the pump to be integrated into a wide variety of hydraulic circuits without extensive modification.

To accommodate diverse operational needs, the A11VO is available with a comprehensive selection of variable displacement controls. These units enable different control functions, ensuring that the pump’s output can be precisely matched to the specific requirements of the machine and its tasks. Furthermore, for enhanced on-site flexibility, the power setting of the pump can be adjusted externally, and crucially, this adjustment can be performed even while the machine is in operation, allowing for real-time optimization without downtime.

The pump’s robust construction is complemented by its thoughtful mechanical design. It features a through drive capability that is particularly noteworthy, as it is engineered to accept the attachment of additional pumps, such as gear pumps or further axial piston pumps, up to the same frame size. This allows for 100% through-drive torque, enabling a compact and efficient multiple-pump arrangement from a single drive source.

In terms of performance, the A11VO delivers highly controllable hydraulic power. The volume flow is directly proportional to both the drive speed and the displacement setting. This flow can be adjusted infinitely and steplessly across its entire operating range, from its maximum volume (QVmax) down to a negligible minimum (QVmin = 0). This precise, variable control is essential for optimizing the efficiency and responsiveness of modern mobile hydrostatic drives.

Ordering Code / Standard Program

A11V		○			/	1			-	N
01	02	03	04	05		06	07	08		09	10	11	12	13	14	15	16

Axial piston unit

Swashplate design, variable, nominal pressure 350 bar, maximum pressure 400 bar

A11V

Charge pump(impeller)

02	without charge pump (no code)	●	●	●	●	●	●	●	●
02	with charge pump	-	-	-	-	●	●	●	●	L

Operation

Pump, open circuit

○

Size

≈Displacement Y_g_maxin cm³

130

145

190

260

Control unit

Power control

●

with override

cross sensing

negative

●

LP.C

high-pressure related

negative

LR3

●

LR3

pilot-pressure related

negative

LG1

●

LG1

positive

LG2

●

LG2

electric

U=12V

negative

LE1

○

●

LE1

U=24V

negative

LE2

○

●

LE2

with pressure cut-off

●

L.D..

hydraulic,2-stage

●

L.E..

hydraulic, remote controlled

●

L..G.

with load sensing

●

L...S

electric, prop. override, 24 V

○

●

L...S2

hydraulic, prop. override

○

●

L...S5

with stroke limiter

negative

characteristic

Δp =25 bar

●

L...H1

Δp =10 bar

●

L...H5

positive

characteristic

Δp =25 bar

●

L...H2

Δp =10 bar

●

L...H6

U=12V

●

L...U1

U=24V

●

L...U2

Pressure control

●

with load sensing

DRS

●

DRS

remote controlled

DRG

●

DRG

for parallel operation

DRL

●

DRL

Hydraulic control , pilot-pressure related

(positive characteristic)

Δp = 10 bar

HD1

●

HD1

Δp=25 bar

HD2

●

HD2

with pressure cut-off

●

HD.D

with pressure cut-off, remote controlled

○

●

○

●

HD.G

Electric control with proportional solenoid

(positive characteristic)

U=12V EP1

●

EP1

U=24V EP2

●

EP2

with pressure cut-off

●

EP.D

with pressure cut-off, remote control

●

EP.G

In case of controls with several additional functions, observe the order of the columns, only one option per column is possible (e.g. LRDCH2). The following combinations are not available for the power control: LRDS2, LRDS5, L.. GS, L.. GS2, L. GS5EC and the combination L..DG in conjunction with the stroke limiters H1, H2, H5, H6, U1 and U2.

Series

Index

07	Size 40 ... 130	0
07	Size 145...260	1

Direction of rotation

08	Viewed from shaft end	clockwise	R
		counter-clockwise	L

Seals

NBR (nitrile-caoutchouc), shaft seal ring in FKM (fluor-caoutchouc)

Shaft end

10			40	60	75	95	130	145	190	260
	Splined shaft DIN 5480 for single and combination pump		●	●	●	●	●	●	●	●	Z
	Parallel keyed shaft DIN 6885		●	●	●	●	●	●	●	●	P
	Splined shaft ANSI B92.1a-1976	for single pump	●	●	●	●	●	●	●	●	S
	Splined shaft ANSI B92.1a-1976	for combination pump	●	●	●	_1)	_1)	_1)	●	●	T

Mounting flange

11		40	60	75	95	130	145	190	260
	SAE J744-2-hole	●	●	-	-	-	-	-	-	C
	SAE J744-4-hole	-	-	●	●	●	●	●	●	D
	SAE J617²⁾ (SAE 3)	-	-	-	●	●	●	●	-	G

Service line ports

Pressure and suction port SAE, at side, opposite side

(with metric fastening threads)

130

145

190

260

●

Through drive

130

145

190

260

Flange SAE J744³⁾

Coupler for splined shaft

●

N00

82-2

(A)

5/8in

9T 16/32DP

(A)

●

K01

3/4in

11T 16/32DP

(A-B)

○

●

○

●

○

K52

101-2

(B)

7/8in

13T 16/32DP

(B)

●

K02

1in

15T 16/32DP

(B-B)

●

K04

W35

2x30x16x9g

●

K79

127-2

(C)⁴⁾

1 1/4in

14T 12/24DP

(C)

●

K07

1 1/2in

17T 12/24DP

(C-C)

●

K24

W30

2x30x14x9g

●

K80

W35

2x30x16x9g

●

K61

152-4

(D)

1 1/4in

14T 12/24DP

(C)

●

K86

1 3/4in

13T 8/16DP

(D)

●

K17

W40

2x30x18x9g

●

K81

W45

2x30x21x9g

●

K82

W50

2x30x24x9g

●

K83

165-4

(E)

1 3/4in

13T 8/16DP

(D)

●

K72

W50

2x30x24x9g

●

K84

W60

2x30x28x9g

●

K67

Swivel angle indicator

14		40	60	75	95	130	145	190	260
	without swivel angle indicator (no symbol)	●	●	●	●	●	●	●	●
	with optical swivel angle indicator	●	-	●	●	●	●	●	●	v
	with electric swivel angle sensor	●	-	●	●	●	●	●	●	R

Connector for solenoids

15		40	60	75	95	130	145	190	260
15	DEUTSCH connector molded, 2-pin - without suppressor diode	●	●	●	●	●	●	●	●	P

Standard/special version

16	Standard version	without symbol
	Standard version	combined with attachment part or attachment pump	-K
	Special version		-S
	Special version	combined with attachment part or attachment pump	-SK

1) S-shaft suitable for combination pump!

2) To fit the flywheel case of the combustion engine

3)22-hole;44-hole

4) Size 190 and 260 with 2 + 4-hole flange

•= available ○= on request -= not available = preferred program

Technical Data

Table of values (theoretical values, without efficiency and tolerances; values rounded)

Size	A11VO		40	60	75	95	130	190	190	260
Displacement	V_gmax	cm³	42	58.5	74	93.5	130	190	190	260
Displacement	V_gmin	cm³	0	0	0	0	0	0	0	0
Speed
maximum at V_g max¹⁾ maximum at V_g ≤ V_g max¹⁾	n_max	rpm	3000	2700	2550	2350	2100	2200	2100	1800
maximum at V_g max¹⁾ maximum at V_g ≤ V_g max¹⁾	n_max1	rpm	3500	3250	3000	2780	2500	2500	2100	2300
Flow at n_maxand v_{g max}	q_{v max}	I/min	126	158	289	220	273	319	405	468
Flow at q_v_maxand Δp = 350 bar	P_max	kW	74	92	110	128	159	186	236	273
Torque at v_g_maxand Δp = 350 bar	T_max	Nm	234	326	412	521	724	808	1075	1448
Rotary stiffness	Z shaft	Nm/rad	88894	102440	145836	199601	302495	302495	346190	686465
	P shaft	Nm/rad	87467	107888	143104	196435	312403	312403	383292	653835
	S shaft	Nm/rad	58347	86308	101921	173704	236861	236861	259773	352009
	T shaft	Nm/rad	74476	102440	12560	-	-	-	301928	567115
Moment of inertia for rotary group	J_TW	Kgm²	0.0048	0.0082	0.0115	0.0173	0.0318	0.0341	0.055	0.0878
Angular acceleration, max⁴⁾	α	rad/s²	22000	17500	15000	13000	10500	9000	6800	4800
Filling capacity	V	I	1.1	1.35	1.85	2.1	2.9	2.9	3.8	4.6
Mass (approx.)	m	kg	32	40	45	53	66	76	95	125

Size	A11VO		130	145	190	260
Displacement	V_gmax	cm³	130	145	193	260
Displacement	V_gmin	cm³	0	0	0	0
Speed
maximum at V_g max¹⁾ maximum at V_g ≤ V_g max¹⁾	n_max	rpm	2500	2500	2500	2300
maximum at V_g max¹⁾ maximum at V_g ≤ V_g max¹⁾	n_max1	rpm	2500	2500	2500	2300
Flow at n_maxand v_{g max}	q_{v max}	I/min	325	363	483	598
Flow at q_v_maxand Δp = 350 bar	P_max	kW	190	211	281	349
Torque at v_g_maxand Δp = 350 bar	T_max	Nm	724	808	1075	1448
Rotary stiffness	Z shaft	Nm/rad	302495	302495	346190	686465
	P shaft	Nm/rad	312403	312403	383292	653835
	S shaft	Nm/rad	236861	236861	259773	352009
	T shaft	Nm/rad	-	-	301928	567115
Moment of inertia for rotary group	J_TW	Kgm²	0.0337	0.036	0.0577	0.0895
Angular acceleration, max⁴⁾	α	rad/s²	10500	9000	6800	4800
Filling capacity	V	I	2.9	2.9	3.8	4.6
Mass (approx.)	m	kg	72	73	104	138

1 )The values apply at absolute pressure (P_abs) 1 bar at the suction port S and mineral hydraulic fluid.

2)The values apply at absolute pressure (P_abs) of at least 0.8 bar at the suction port S and mineral hydraulic fluid.

3) The values apply at Vs Vg max or in case of an increase in the inlet pressure P_abs at the suction port S (see diagram page 6)

4) - The area of validity is situated between 0 and the maximum permissible speed.It applies for external stimuli (e.g. engine 2-8 times rotary frequency, cardan shaft twice the rotary frequency).

-The limit value applies for a single pump only.

-The loading on the connection parts has to be considered.

Caution:

Exceeding the permissible limit values could cause a loss of function, reduced service life or the destruction of the axial piston unit. The permissible values can be determined by calculation.

Permissible radial and axial loadirng on drive shaft

The values stated are maximum data and not permissible for continuous operation

Size			40	60	75	95	130	190	190	260
Radial force, max.at distance a, b,c(from shaft collar)	F_{q max} a	N mm	3600	5000	6300	8000	11000	11000	16925	22000
	F_{q max} a	N mm	17.5	17.5	20	20	22.5	22.5	26	29
	F_{q max} b	N mm	2891	4046	4950	6334	8594	8594	13225	16809
	F_{q max} b	N mm	30	30	35	35	40	40	46	50
	F_{q max} c	N mm	2416	3398	4077	5242	7051	7051	108500	13600
	F_{q max} c	N mm	42.5	42.5	50	50	57.5	57.5	66	71
Axial force, max.	±Fax max	N	1500	2200	2750	3500	4800	4800	6000	4150

Permissible input and through drive torques

Size			40	60	75	95	130	190	190	260
Torque (at V_g max and Δp = 350 bar ¹⁾	T_max	Nm	234	326	412	521	724	808	1075	1448
Input torque, max.²) at shaft end P Shaft key DN 6885
	T_{E perm}.	Nm	468	648	824	1044	1448	1448	2226	2787
	T_{E perm}.	Nm	Φ32	Φ35	Φ40	Φ45	Φ50	Φ50	Φ55	Φ60
at Z shaft end DIN 5480	T_{E perm}.	Nm	912	912	1460	2190	3140	3140	3140	5780
at Z shaft end DIN 5480	T_{E perm}.	Nm	W35	W35	W40	W45	W50	W50	W50	W60
at S shaft end ANSI B92.1a-1976 (SAE J744)	T_{E perm}.	Nm	314	602	602	1640	1640	1640	1640	1640
at S shaft end ANSI B92.1a-1976 (SAE J744)	T_{E perm}.	Nm	1in	1 1/4in	1 1/4in	1 3/4in	1 3/4in	1 3/4in	1 3/4in	1 3/4in
at T shaft end ANSI B92.1a-1976 (SAE J744)	T_{E perm}.	Nm	602	970	970	-	-	-	2670	4070
at T shaft end ANSI B92.1a-1976 (SAE J744)	T_{E perm}.	Nm	1 1/4 in	1 3/8 in	1 3/8 in	-	-	-	2 in	2 1/4 in
Through drive torque, max.³)	T_{D perm}.	Nm	314	521	660	822	1110	1110	1760	2065