Bent Axis Piston Pump, A7V Manufacturer

Bent Axis Piston Pump, A7V

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, A7V

Descriptions
1. OSA7V is a variable displacement pump with axial piston and bent axis design. The bent axis piston pump is used for hydrostatic transmissions in open circuit operation.
2. The flow is in proportion to the drive speed and the displacement and is steplessly variable at constant drive speed.
3. Thebent axis pump comes with a complete range of control devices for all kinds of control and adjustment.
4. It runs on mineral oil and fire resistant fluid.
5. With large size and robust casing, the bent axis hydraulic pump can meet the working requirements in various extreme working conditions.

Applications
The OSA7V bent axis piston pump is mainly used in the hydraulic systems of metal forming machinery, natural gas refueling equipment, construction machinery (pile driver), etc.

Section View

Structural Features
1. The axial piston pump is equipped with high performance rotating group and valve plate in spherical surface design, realizing automatic centering, low peripheral speed and high efficiency.
2. Drive shaft can bear radial load.
3. Long service life;
4. Low noise

Stroke limiter
Shaft end (Splined shaft)

Notes:
Casing drainage oil temperature is influenced by pressure and pump speed and is always higher than the circuit temperature. However, at no point in the circuit may the temperature exceed 90℃.

The minimum pressure at the suction port of the pump≥ 0.08MPa (Absolute pressure), and the drain pressure (Maximum allowable casing pressure) is 0.2MPa (absolute pressure). The pressure in the housing must be the same or greater than the external pressure to the shaft seal.

Technical Parameters

1. Inlet Operating Pressure Range (Absolute Pressure)
Minimum pressure: Ps min=0.08 bar
Maximum pressure: Ps max=0.2 bar

2. Outlet Operating Pressure Range
Nominal pressure: Pn=35 bar
Peak pressure: Pmax=40 bar

3. Technical Parameter List
(Nominal data, without considering mechanical efficiency and volumetric efficiency)

Size				20	28	40	55	58	80	78	107	117	160
Displacement	Vgmax mL /r			20.5	28.1	40.1	54.8	58.8	80	78	107	117	160
Displacement	Vgmin mL /r			0	8.1	0	15.8	0	23.1	0	30.8	0	46.2
Control devices ● = Available	LV			●	●	●	●	●	●	●	●	●	●
	LVS											●
	DR			●		●		●		●		●
	DRS											●
	MA			●	●	●	●	●	●	●	●	●	●
Max. Speed	0.09MPa	nmax0.09	r/min	3800	2800	3200	2360	2850	2120	2540	1900	2240	1650
	0.1 MPa	Nmax 0.1	r/min	4100	3000	3400	2500	3000	2240	2700	2000	2360	1750
	0.15MPa	Nmax 0.15	r/min	4750	3600	3750	3000	3350	2750	3000	2450	2650	2100
Max. Flow	Nmax0.09	Qmax0.09	L/min	76	76	124	125	161	164	192	197	254	256
	Nmax0.1	Qmax0.1	L/min	82	82	132	133	170	174	204	208	267	271
	Nmax0.15	Qmax0.15	L/min	94	98	146	160	190	213	227	254	300	326
Max. Power (△ p=35MPa)	Qmax0.09	P max0.09	KW	45	46	75	75	97	99	116	119	153	154
	QmaxO.1	P max0.1	KW	49	49	80	80	102	105	123	125	161	163
	Qmax0.15	Pmax0.15	KW	57	59	88	96	114	128	136	153	181	196
Flow	NE=1450r/min	Q	L/min	28.8	39.5	56.4	77.1	82.3	112.5	109.7	150.5	164.6	225
Power (△ p=35MPa)	NE=1450r/min	P	KW	17	24	34	46	50	68	66	91	99	135
Torque (△ p=10MPa)	Vgmax	M	Nm	32.6	44.6	63.7	87	93.2	127.5	124	169.7	186	254
Torque (△ p=10MPa)	Vgmin	M	Nm	-	12.9	-	25.1	-	36.8	-	49	-	73.5
Torque (△ p=35MPa)	Vgmax	M	Nm	114	156	223	305	326	446	431	594	651	889
Torque (△ p=35MPa)	Vgmin	M	Nm	-	45	-	88	-	129	-	171	-	257
Moment		J	kgm²	0.0017	0.0017	0.0052	0.0052	0.0109	0.0109	0.0167	0.0167	0.0322	0.0322
Weight	Kg			19	19	28	28	44	44	53	53	76	76

Type Code

OS7V	55	LV	1	l L	Z	F	O	O
1	2	3	4	5	6	7	8	9

1- Machinery Type

Axial piston, bent axis, variable

OS7V

2- Size

Displacement mL /r

107

117

160

3- Control Device

Constant power control	LV
Constant power control with load sensing	LVS
Constant pressure control	DR
Constant pressure control with load sensing	DRS
Manual control	MA

4- Series

---

5- Rotating Direction (View on Shaft End)

Clockwise	R
Counterclockwise	L

6- Shaft End

Splined shaft DIN 5480	Z
Splined shaft GB 3478.1-83	S
Keyed shaft GB1096-79	P

7- Ports Type

Pressure port: SAE flange, on side Suction port: SAE flange, on side	F
Pressure port: threaded, on side Suction port: SAE flange, on side	G

8- Stroke Limiter

5SW none	O
Stroke limiter, mechanically adjustable (for LV and DR)	M
Stroke limiter, hydraulic (for LV)	H

9- Auxiliary Equipment

None	O
With pressure cut-off	D

Ordering Example： OS7V.55.LV.1 .L.Z.F.0.0
Axial piston variable displacement pump 0S7V, size 55. With constant power control, series 1.

Anti-clockwiserotation, splined shaft, SAE flange connections, without stroke limiter and auxiliary equipment.

LV Constant Power Control

LV Constant power control

The constant power control controls flow in relation to pressure, thereby maintaining hydraulic power constant. (Provided that the drive speed is constant)
P=p*Q/60= Constant
P~ power[KW]
p~ pressure[MPa]
Q~ flow[L/min]
Commencement of control: Min. 5MPa
Total power control can be realized by throttles via port G.

OS7V Bent Axis Piston Pump with Constant Power Control

No.	Model	Specifications
1	OS7V Bent Axis Pump	OS7V 40 LV(DR) 1R(L) P(Z;S)F(G)OO
2		OS7V 55 LV(DR) 1R(L) P(Z;S)F(G)OO
3		OS7V 58 LV(DR) 1R(L) P(Z;S)F(G)OO
4		OS7V 80 LV(DR) 1R(L) P(Z;S)F(G)OO
5		OS7V 78 LV(DR) 1R(L) P(Z;S)F(G)OO
6		OS7V 107 LV(DR) 1R(L) P(Z;S)F(G)OO
7		OS7V 117 LV(DR) 1R(L) P(Z;S)F(G)OO
8		OS7V 160 LV(DR) 1R(L) P(Z;S)F(G)OO

Stroke Limiter
By means of a mechanical or hydraulic stroke limiter, the maximum displacement can be infinitely varied or limited. Adjustment range from Vgmax to Vgmin.

Mechanical Stroke Limiter

Size	20	40	58	78	117
Size	28	55	80	107	160
Spindle Revolutions	23	21	28	31	26
Required Torque (approx. JNcm	80	140	500	630	-

Constant power control with mechanical stroke limiter

Constant power control with hydraulic stroke limiter

Hydraulic Stroke Limiter
A pilot pressure (port X1) that is not less than 10% of the operating pressure is required for the hydraulic stroke limiter. Maximum allowable pressure at port X1 is 30MPa (for all sizes). If it is required to limit the flow at an operating pressure of less than 5MPa, an oil supply pressure that is not less than 5MPa must be applied at port X2 (pressure of port X1 is 10% pressure of port X2, namely 5MPa×10%=0.5MPa)

Auxiliary Equipment
Pressure cut-off
For all sizes with Vgmin=0

The pressure cut-off is a constant pressure control superposed on the constant power control and is carried out by means of a sequence valve. When the set maximum pressure is reached (adjustment range up to 315MPa), the valve opens and the flow is automatically reduced to zero. The sequence valve is mounted separately from the pump. It can be mounted on a subplate in any suitable location (remote control).

When using the constant power control with pressure cut-off unit, the pump control time will be approximately 3 times longer than that of constant pressure control pump.

Important: Port T from the sequence valve and port T1 from the pilot oil return line must be directly connected to the oil tank.

Ports
B Pressure port
S Suction port
G Port for summation power control line
X1 Pilot pressure port
X2 Remote control pressure port
A1,X3 Ports for remote control valve
T1 Pilot oil return port
R Airbleed port

Constant power control with pressure cutoff (remote control) and hydraulic stroke limiter

DR Constant Pressure Control

In its control range, the constant pressure control device maintains the system pressure constant without impact by pump flow change. The variable displacement bent axis piston pump only supplies a necessary volume of fluid. If the operating pressure exceeds the preset valve, the pump is automatically swiveled back to a smaller angle.

The required pressure can be directly set on the pump (built in valve, standard) with 5-35MPa range. For remote control type, it can be set independently on the sequence valve with 5-31.5MPa range.

Constant pressure control DR (valve built-in)

Constant pressure control DR (remote controlled)

Note: Sequence valve and subplate should be ordered separately. The maximum single pipe length should not exceed 5m. Sequence valve Port T must be piped separately to tank. Pressure of the relief valve installed in the system for pressure protection must be 2MPa higher than the pressure of the constant pressure control.

Constant Pressure Control DR Size (Standard, Remote Control, Z-Axis)

Size	a	A1	A2	A3	A4	A5	A6	A7
20	9°	251	134	95	106	38	-	-
40	9°	315	166	107	127	40	14	53
58	9°	372	160	107	138	62	15	69
78	9°	380	180	114	147	60	14	70
117	9°	441	199	132	165	65	14	83

Adjustment Times

Size	20	40	58	78	117
Vgmin^_Vgmax te (S) 35-5MPa Pressure unloading	0.16	0.2	0.25	0.25	0.3
Vgmax-Vgmin ta (S) 5-35MPa Pressure built-up	0.03	0.04	0.05	0.05	0.06

The values in the table are increased by 3 times for remote control.

Parallel Operation
When several 0S7V constant pressure variable displacement pumps operate in parallel, the constant pressure curve will be respectively steep. Please specify "parallel operation" when ordering. For parallel operation each individual pump requires its own sequence valve.

Stroke Limiter
The maximum displacement can be steplessly limited from Vgmax to Vgmin by means of a mechanical stroke limiter. For details see control device LV.

Continuous Operation in Zero Position

Zero stroke operation without flushing of housing

Short period (< 10min)	Max. allowable pressure P_max (MPa)	31.5
Short period (< 10min)	Max. allowable temperature P_max (℃)	50
Long periods	Max. allowable pressure P_max (MPa)	20
Long periods	Max. allowable temperature T_max (℃)	50

Zero stroke operation without flushing of housing

Long periods	Max. allowable pressure P_max (MPa)	31.5
Long periods	Max. tank temperature P_max (℃)	50

Flushing Fluid Port

Flushing Flow

Size	20	40	58	78	117
flow Qsp L/min	2	4	6	8	12

Note: When the 0S7V bent axis piston pump is mounted on top of tank and works for a long time with zero stroke under 31.5MPa Pmax, a certain flow of flushing fluid that is equal to or more than the flushing flow as indicated for each size in the above table must be provided for flushing pump casing.

Temperature of flushing fluid: ≤tank temperature

MA Manual control

By turning the handwheel, it enables the piston to move in an axial direction with the help of a screw, and moves the valve plate on its sliding plane via carrier pin, thus allowing the pump to change its displacement steplessly from Vgmin to Vgmax. The pump position indicator is located in the handwheel.

Manual control

Ports
B Pressure port
S Suction port
R Air bleed

Handwheel Downwards

Size	a	A1	A2	A3	A4
20	9°	251	108	175	95
28	16°	260	108	190	80
40	9°	315	134	197	108
55	16°	323	134	215	89
58	9°	327	155.5	215	107
80	16°	380	155.5	235	86
78	9°	380	169	246	144
107	16°	390	169	270	92
117	9°	441	192	261	132
160	16°	450	192	285	107

Handwheel Upwards

Size	a	A1	A2	B1	B2
20	9°	-	-	-	-
28	16°	-	-	-	-
40	9°	317	100	175	132.5
58	9°	-	-	-	-
80	16°	-	-	-	-
78	9°	315	1000	180	157.5
107	16°	383	100	270.5	132.5
117	19°	-	-	-	-
160	16°	445	100	225	143
250	26.5°	584	120	320	230

Please specify whether the handwheels are upwards or downwards when you order goods!