Rexroth A4VTG Series Axial Piston Variable Displacement Hydraulic Pump

A4VTG series is swash-plate axial pistonvariable-type pump.It is used for hydrostatictransmission in closed circuits.The flow isproportional to the driving speed and displacementThe output flow increases from zero to maximumwith the swash plate swing Angle.It providesa variety of control and regulation functionsfor various of high compatibility controlequipment.Two overflow valves which are equippedon each side of the pump are used to preventthe static hydraulic drive (pump and motor)fromoverload,and also have the function of filling oil.

Technical parameter
Data sheet (theoretical values, excluding coefficients and tolerances; Approximate value)
Specification				NG		71	90
Displacement Variable pump				Vg max	cm³	71	90
Refill pump (at p=20 bar Hour)				Vgsp	cm³	20.5	27
Speed at Vgmax				Nnom	rpm	3300	3050
Minimum speed				Nmin	rpm	500	500
Flow rate NnomH and Vgma				9 max	I/min	234	275
Power) Nnom H.Vgmax		△p=400 bar		Pm	kW	156	183
Torque 1) Vg max and		△p=400 bar		Tma	Nm	452	573
		△p=100 bar		T	Nm	113	143
Rotational stiffness drive shaft V8				C	Nm/rad	120900	一
Drive shaft V9				C	Nm/rad	一	150896
The moment of inertia of the rotor group				JGR	kgm²	0.0097	0
Maximum angular acceleration 2				0	rad/s2	21000	18000
Filling capacity				V	L	1.3	1
Approximate weight (without band-pass shaft drive)				m	kg	51	53
1) No refill pump
2 The effective area is between the minimum required speed and the maximum allowable speed.
It is suitable for external excitation (e.g. engine rotation frequency of 2 to 8 times the original, cardan shaft rotation frequency of 2 times the original). Limit values apply to single stage pumps only. The load capacity of the connector must be considered.
Attention
"Operating above or below the maximum value may result in loss of function, shortened service life or damage to the axial plunger unit. We recommend by experiment or calculation/model The load test is carried out in an equal manner and compared with the allowable values."
Determine the specification
Flow rate			[L/min]	Vg= displacement per revolution (cm3
				△p = Differential pressure(bar
Torque			[Nm]	n = Rotational speed(rpm)
				nv= Volumetric efficiency
Power			[KW]	nmh= Mechanical - hydraulic efficiency
				7t= Overall efficiency(n=n·nmh

Low speed and high torque hydraulic motor, capable of outputting the same high torque power at very low hydraulic flow rates without experiencing hydraulic motor shaking or crawling!

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