Detailed description

This is a variable pump equipped with an axial tapered piston rotary group of bent-axis design, specifically developed for hydrostatic drives in open-circuit systems. It ensures efficient power transmission and stable oil flow output, which is essential for the reliable operation of open-circuit hydrostatic drive systems. The pump is suitable for both mobile and stationary applications, such as construction machinery, agricultural equipment, and industrial hydraulic stations, adapting to different working environments and load requirements. Its flow rate is proportional to the drive speed and displacement, meaning the output flow can be flexibly adjusted with the changes of these two parameters to match actual working demands. The flow can be steplessly changed by adjusting the bent axis, enabling precise and smooth flow regulation without obvious pressure fluctuations. It offers a wide selection of control devices, including manual, hydraulic, and electric controls, to meet diverse system control needs. With a compact and robust structure, the pump has strong resistance to wear and impact, ensuring a long service life and reducing maintenance frequency and costs.

Ordering code

01	02	03	04		05	06		07	08	09	10	11	12	13
A7V	○			/	63		-	V		B	01

Axial piston unit

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

A7V

Operating mode

Pump, open circuit

○

Size (NG)

03	Geometric displacement V2 (cm 3), see "Technical data" on page 7	28	55	80	107	160
03	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	-	●	●	●	●	LRH1
	with pressure cut-o ffand stroke limiter	negative control	Δp =25 bar	-	●	●	●	●	LRDH1
	with pressure cut-o ffand 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=24V	●	●	●	●	●	EP2

Series

Series 6, index 3

Direction of rotation

			28 to 160
06	Viewed on drive shaft	clockwise	●	R
06		counter-clockwise	●	L

Sealing material

FKM (fluoroelastomer)

Drive shaft

		28 to 160
08	Splined shaft DIN 5480	●	Z
08	Parallel keyed shaft according to DIN 6885	●	P

Mounting flange

ISO 3019-2; 4-hole

Port plate for working lines

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

1	2	3	4		5	6		7	8	9	10	11	12	13
A7V	○			/	63		-	V		B	1

Connector for solenoids¹⁾

11	Without connector (without solenoid, with hydraulic control only; without code)
11	DEUTSCH molded connector, 2-pin - without suppressor diode	P

Standard / special version

12	Standard version (without code)
12	Special version	-S

•= available -= not available = preferred program

Notes

▶Preser vation:

-Up to 12 mont hs as standard

-Up to 24 mont hs long-term

(state in plain text when ordering)

Technical data

Size		NG		28	55	80	107	160
Displacement, geometric, per revolution		V_{g ma}_x	cm³	28.1	54.8	80	107	160
Maximum rotational speed ¹⁾	At V_{g max}	n_nom	rpm	3150	2500	2240	2150	1900
Maximum rotational speed ¹⁾	At V_g<0.74 x V_g_max	n_max1	rpm	4250	3400	3000	2900	2560
Maximum rotational speed ²⁾		n_max2	rpm	4750	3750	3350	3200	2850
Flow	At V_{g max}and n_nom	q_v	I/min	89	137	179	230	304
Power	At V_{g max}, n_nomand Δp =350 bar	P	kW	52	80	105	134	177
Torque	At V_{g max}and Δp =350 bar	T	Nm	156	305	446	596	891
Rotary stiffness	V_g_max to V _g/2	c_min	kNm/rad	5	10	16	21	36
Rotary stiffness	V_g/2 to 0 (interpolated)	c_max	kNm/rad	16	32	49	67	104
Moment of inertia rotary group		J_TW	kgm²	0.0042	0.0042	0.0080	0.0127	0.0253
Maximum angular acceleration		α	rad/s²	35900	31600	24200	19200	15300
Case volume		V	l	0.5	0.75	1.2	1.5	2.4
Weight (approx.)		m	kg	17	25	40	49	71

Maximum permissible speed (limit speed)

Determining the operating characteristics

Flow	q_v=(V_g∙ n ∙ η_v) / 1000	I/min
Torque	T=(V_g ∙ Δp) /(20 ∙ π ∙ η_mh)	Nm
Power	P=(2π ∙ T ∙ n)/60000=(q_v∙ Δp)/(600 ∙ η_t)	kW

Key

V_g = Displacement per revolution [cm³]

Δp = Differential pressure [bar]

n = Rotational speed [rpm]

η_v = Volumetric efficiency

η_mh = Hydraulic-mechanical efficiency

η_t = Total efficiency (η_t= η_v*η_mh)

Notes

▶Theore tical 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 P_abs = 1 bar at suction port S

- For the optimal viscosity range of v_opt = 36 to 16 mm²/s

-For hydraulic fluid based on mineral oils.

2) Maximum rotational speed (speed limit) for increased inlet pressure P_abs at suction port S and V_g < V_g_max, see diagram.

Bent Axis Variable Piston Pump A7VO

Detailed description