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Closed Loop Variable Displacement Piston Pump AA4VG

Closed Loop Variable Displacement Piston Pump AA4VG

1.Integrated auxliay pump for boost and piot oilsupply.

2.Flow direcion changes smoothy when the swashplate is moved through the neutral postion

3.High-pressure relief valves with integated boost function.

4.With adjustable pressure cut-off as standard

5.Through drive for mounting of further pumps up to same nominal size

6.Large variety of controls

Detailed description

1.Integrated auxiliary pump for boost and pilot oil supply, which integrates the boost and pilot oil supply functions into a single component, effectively simplifying the overall hydraulic system structure, reducing installation space, and ensuring stable and reliable oil supply for both boost and pilot circuits, thus improving the operational stability of the entire equipment.

2.Flow direction changes smoothly when the swashplate is moved through the neutral position. This design avoids sudden pressure fluctuations and impact during flow direction switching, reduces mechanical wear of internal components, extends the service life of the pump, and ensures smooth and steady operation of the hydraulic system during forward and reverse operation.

3.High-pressure relief valves with integrated boost function, which not only play a role in overpressure protection to prevent damage to the system caused by excessive pressure but also integrate the boost function, realizing the integration of multiple functions, reducing the number of independent components, and lowering the system cost and maintenance difficulty.

4.With adjustable pressure cut-off as standard, allowing users to flexibly adjust the pressure cut-off value according to actual working conditions and load requirements, ensuring the pump operates within the safe pressure range, and adapting to different application scenarios to improve the versatility and applicability of the pump.

5.Through drive for mounting of further pumps up to same nominal size, providing a convenient and compact installation solution for expanding the hydraulic system. It enables the installation of additional pumps of the same nominal size without redesigning the drive structure, enhancing the expandability of the system and meeting the needs of large flow or multi-circuit oil supply.

6.Large variety of controls, including manual, hydraulic, electric and other control modes, which can be selected according to the actual control requirements of the equipment, realizing flexible and precise control of the pump, and adapting to different operating environments and control systems.

Type code

01	02	03	04	05	06	07	08	09		10	11		12	13	14	15	16	17	18	19	20	21	22
AA4V	G			D					/	32		-	N

Axial piston unit

Swashplate design, variable, nominal pressure 5800 psi (400 bar), maximum pressure 6500 psi (450 bar)

AA4V

Operating mode

Pump, closed circuit

Size(NG)

03	Geometric displacement, see "Technical data" on page 8	in3/rev.	1.71	2.44	3.42	4.33	5.49	7.63
03	Geometric displacement, see "Technical data" on page 8	cm3/rev.	28	40	56	71	90	125

Control device

				28	40	56	71	90	125
04	Without control module			●	●	●	●	●	●	NV
	Proportional control, hydraulic	Pilot-pressure related p = 87 to 260 psi (6 to 18 bar)		○	○	●	●	●	●	HD3
	Proportional control, hydraulic	Mechanical servo		●	●	●	●	●	●	HW
	Proportional control, electric		U=12V	●	●	●	●	●	●	EP3
	Proportional control, electric		U=24V	●	●	●	●	●	●	EP4
	Two-point control, electric		U=12V	●	●	●	●	●	●	EZ1
	Two-point control, electric		U=24V	●	●	●	●	●	●	EZ2
	Automatic control, speed related		U=12V	●	●	●	●	●	●	DA1
	Automatic control, speed related		U=24V	●	●	●	●	●	●	DA2
	Hydraulic control, direct operated			○	○	●	●	●	●	DG
	Electric control, direct operated, two pressure reducing valves		U=12V	●	●	●	●	-	-	ET5
			U=24V	●	●	●	●	-	-	ET6

Pressure cut-off

Pressure cut-off (standard)

Neutral position switch

06	Without neutral position switch (without code)	●
06	Neutral position switch (for HW control only)	●	L

Mechanical stroke limiter

07	Without mechanical stroke limiter (without code)	●
07	Mechanical stroke limiter, externally adjustable	●	M

Stroking chamber pressure port

		28	40	56	71	90	125
08	\|Without stroking chamber pressure port X₃, X₄ (without code)	●	●	●	●	●	●
08	Stroking chamber pressure port X₃, X₄	○	○	●	●	●	●	T

DA control valve

			NV	HD	HW	DG	DA	EP	EZ
09	Without DA control valve		●	●	●	●	-	●	●	1
	DA control valve, fixed setting			●	●	●	●	●	-	2
	DA control valve, mechanically adjustable with position lever	direction of actuation, clockwise	-	●	●	●	●	●	-	3R
		direction of actuation, counter-clockwise	-	●	●	●	●	●	-	3L
	DA control valve, fixed setting, ports for pilot control device		-	○	○	-	○	○	-	7
	DA control valve, fixed setting and brake inch valve mounted, control with brake fluid	based on mineral oil	-	-	-	-	●	-	-	8

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

Series

Series 3, index 2

Direction of rotation

11	Viewed on drive shaft	clockwise	R
		counter-clockwise	L

Sealing material

NBR (nitrile rubber), shaft seal in FKM (fluoroelastomer)

Drive shaft

			28	40	56	71	90	125
13	Splined shaft ANSIB92.1a	for single pump	●	●	●	●	●	●	S
		for combination pump - 1st pump	_1)	_1)	●	●	_1)	●	T
		only for combination pump -2nd pump	-	●	-	-	●	-	U

Mounting flange

			28	40	56	71	90	125
14	SAEJ744	2-hole	●	●	●	-	-	-	C
14	SAEJ744	2+4-hole	-	-	-	●	●	●	F

Working port

			28	40	56	71	90	125
15	SAE working port A and B, top and bottom	Suction port S bottom	-	●	●	●	●	●	52
	SAE working port A and B, top and bottom	Suction port S top	-	○	●	-	-	○	53
	SAE working port A and B, same side right²⁾	Suction port S bottom	●	-	-	-	-	-	60
	SAE working port A and B, same side left²⁾	Suction port S bottom	-	-	-	●	-	-	60
	SAE working port A and B, same side right²⁾	Suction port S top	-	-	-	-	-	○	63

Boost pump

16	Without integrated boost pump	without through drive	N
	Without integrated boost pump	with through drive	K
	Integrated boost pump	with and without through drive	F

Through drives³⁾

			28	40	56	71	90	125
17	Without through drive, versions N and F (no. 16) only		●	●	●	●	●	●	00
	Flange SAE J744⁴⁾	Hub for splined shaft
	82-2 (A)	5/8 in 9T 16/32DP⁵⁾	●	●	●	●	●	●	01
	101-2 (B)	7/8 in 13T 16/32DP⁵⁾	●	●	●	●	●	●	02
	101-2 (B)	1in 15T 16/32DP⁵⁾	●	●	●	●	●	●	04
	127-2 (C)⁶⁾	1 1/4 in 14T 12/24DP⁵⁾	-	-	●	●	●	●	07
	152-2/4 (D)	13/4 in 13T 8/16DP⁵⁾	-	-	-	-	-	●	69

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

1) Standard for combination pump - 1st pump: Shaft S

2) Only possible without attachment filter

3) Specifications for version with integrated boost pump, please contact us for version without boost pump

4) 2 = 2-hole; 4 = 4-hole

5) Hub for splined shaft to ANSI B92.1a

6) NG90 to 125 with additional 4-hole-flange (127-4)

High-pressure relief valve

		Setting range Δp		28	40	56	71	90	125
18	High pressure relief valve, pilot operated	1450 to 6100 psi (100 to 420 bar)	with bypass	-	-	-	●	●	●	1
	High-pressure relief valve, direct operated, fixed setting	3600 to 6100 psi (250 to 420 bar)	without bypass	●	●	●	-	-	-	3
		3600 to 6100 psi (250 to 420 bar)	with bypass	●	●	●	-	-	-	4
		1450 to 3600 bar (100 to 250 bar)	without bypass	●	●	●	-	-	-	5
		1450 to 3600 bar (100 to 250 bar)	with bypass	●	●	●	-	-	-	6

Filtration boost circuit/external boost pressure supply

		28	40	56	71	90	125
19	Filtration in the boost pump suction line	●	●	●	●	●	●	S
	Filtration in the boost pump pressure line Ports for external boost circuit filtration (F_e and F_a)	●	●	●	●	●	●	D
	Mounted cold start valve and ports for external boost circuit filtration	-	●	●	-	-	-	K
	Attachment filter with cold start valve	-	●	●	●	●	●	F
	Attachment filter with cold start valve and visual contamination indicator	-	●	●	●	●	●	P
	Attachment filter with cold start valve and electric contamination indicator	-	●	●	●	●	●	B
	External boost pressure supply (version without integrated boost pump - NO0, K...)	●	●	●	●	●	●	E

Swivel angle sensor

		28	40	56	71	90	125
20	Without swivel angle sensor (without code)	●	●	●	●	●	●
20	Electric swivel angle sensor⁷⁾	○	○	●	○	○	○	R

Connector for solenoids⁸⁾

21	Without connector (without code), only for purely hydraulic control		●
	DEUTSCH molded connector, 2-pin	without suppressor diode	●	P
	DEUTSCH molded connector, 2-pin	with suppressor diode (only for EZ and DA)	●	Q

Standard / special version

22	Standard version	without code
	Standard version	combined with attachment part or attachment pump	-K
	Special version		-S
	Special version	combined with attachment part or attachment pump	-SK

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

Notice

▶Note the project planning notes on page 68.

▶In addition to the type code, please specify the relevant technical data when placing your order.

7)Please contact us if the swivel angle sensor is used for control

8) Connectors for other electric components may deviate

Technical data

Size				NG	28	40	56	71	90	125
Displacement, geometric, per revolution			V_{g ma}_x	in³	1.71	2.44	3.42	4.33	5.49	7.63
	variable pump		V_{g ma}_x	cm³	28	40	56	71	90	125
	boost pump (at p = 290 psi (20 bar))		V_g_Sp	in³	0.37	0.52	0.71	1.20	1.20	1.73
	boost pump (at p = 290 psi (20 bar))		V_g_Sp	cm³	6.1	8.6	11.6	19.6	19.6	28.3
Rotational speed¹⁾	maximum at V_{g max}		n_nom	rpm	4250	4000	3600	3300	3050	2950
	limited, maximum²⁾		n_max1	rpm	4500	4200	3900	3600	3300	3250
	intermittent, maximum³⁾		n_max2	rpm	5000	5000	4500	4100	3800	3450
	minimum		n_min	rpm	500	500	500	500	500	500
Flow	at n_nom and V_{g max}		q_v	gpm	31.4	42.3	53.4	61.8	72.6	94
Flow	at n_nom and V_{g max}		q_v	I/min	119	160	202	234	275	356
Power⁴⁾	at n_nom, V_{g max}and	Δp = 5800 psi	P	hp	106	143	180	209	245	319
Power⁴⁾	at n_nom, V_{g max}and	Δp =400 bar	P	kW	79	107	134	156	183	238
Torque⁴⁾	at V_{g max}and	Δp =5800 psi	T	Ib-ft	131	188	263	333	423	587
		Δp =400 bar	T	Nm	178	255	357	452	573	796
		Ap =1450 psi	T	lb-ft	33	47	66	83	105	147
		Ap =100 bar	T	Nm	45	64	89	113	143	199
Rotary stiffness of drive shaft		S	c	lb-ft/rad	23159	50892	59595	72871	116609	161010
		S	c	kNm/rad	31.4	69	80.8	98.8	158.1	218.3
		T	c	lb-ft/rad	-	-	70068	89171	-	185939
		T	c	kNm/rad	-	-	95	120.9	-	252.1
		U	c	lb-ft/rad	-	37468	-	-	79362	-
		U	c	kNm/rad	-	50.8	-	-	107.6	-
Moment of inertia for rotary group			J_TW	lbs-ft²	0.0522	0.0902	0.1566	0.2302	0.3536	0.5505
Moment of inertia for rotary group			J_TW	kgm²	0.0022	0.0038	0.0066	0.0097	0.0149	0.0232
Maximum angular acceleration⁵⁾			α	rad/s²	38000	30000	24000	21000	18000	14000
Case volume			V	gal	0.24	0.29	0.40	0.34	0.40	0.55
Case volume			V	I	0.9	1.1	1.5	1.3	1.5	2.1
Weight (without through drive) approx.			m	Ibs	64	68	84	110	132	176
Weight (without through drive) approx.			m	Kg	29	31	38	50	60	80

Notice

▶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. Bosch Rexroth recommend testing the loads by means of experiment or calculation / simulation and comparison with the permissible values.

Determining the operating characteristics

Flow	q_v=(V_g∙ n ∙ η_v) /231	gpm	(V_g∙ n ∙ η_v) / 1000	I/min
Torque	T=(V_g ∙ Δp) /(24 ∙ π ∙ η_h_m)	lb-ft	(V_g ∙ Δp) /(24 ∙ π ∙ η_h_m)	Nm
Power	P=(2π ∙ T ∙ n)/33000=(q_v∙ Δp)/(1714 ∙ η_t)	HP	(2π ∙ M ∙ n)/60000=(q_v∙ Δp∙ η_t)/600	kW

Key

V_g Displacement per revolution [in³(cm³)]

Δp Differential pressure [psi(bar)]

n Rotational speed [rpm]

η_v Volumetric efficiency

η_h_m Hydraulic-mechanical efficiency

η_t Total efficiency (η_t= η_v*η_hm)

1)The values are applicable:

- for the optimum viscosity range from Vopt = 170 to 82 SUS(36 to 16 mm2/s)

- for hydraulic fluid based on mineral oils (for HF hydraulic fluids,observe the technical data in 90225)

2)Valid at half corner power (e.g. at V_{g max} and p_N/2)

3) Valid at Δp = 1000 to 2200 psi (70 to 150 bar) or Δp < 4350 psi(300 bar) and t < 0.1 s

4)Without boost pump

5)The data are valid for values between the minimum required and maximum permissible rotational speed.

Valid for external excitation (e.g. diesel engine 2 to 8 times rotary frequency, cardan shaft twice the rotary frequency).

The limit value is only valid for a single pump.

The load capacity of the connecting parts must be considered.

Permissible radial and axial forces on the drive shaft

▼Splined shaft ANSI B92.1a

Size	NG		28	40	40	56	56	71
Drive shaft		in	1	1	1 1/4	1 1/4	1 3/8	1 1/4
Maximum radial force at distance a(from shaft collar)	F_qmax	lbf	671	958	766	1073	975	1360
	F_qmax	N	2983	4261	3409	4772	4338	6050
	a	in	0.75	0.75	0.94	0.94	0.94	0.94
	a	mm	19	19	24	24	24	24
Maximum axial force	+F_{ax max}	lbf	350	477	477	654	654	954
	+F_{ax max}	N	1557	2120	2120	2910	2910	4242
	-F_{ax max}	lbf	94	198	198	355	355	620
	-F_{ax max}	N	417	880	880	1490	1490	2758

Size	NG		71	90	90	125	125
Drive shaft		in	1 3/8	1 1/4	1 3/4	1 3/4	2
Maximum radial force at distance a(from shaft collar)	F_qmax	lbf	1236	1724	1232	1711	1497
	F_qmax	N	550	7670	5478	7609	6658
	a	in	0.94	0.94	1.32	1.32	1.57
	a	mm	24	24	33.5	33.5	40
Maximum axial force	+F_{ax max}	lbf	954	973	973	1361	1361
	+F_{ax max}	N	4242	4330	4330	6053	6053
	-F_{ax max}	lbf	620	600	600	797	797
	-F_{ax max}	N	2758	2670	2670	3547	3547

Notice

▶The axial and radial forces generally influence the service life of the bearings.

▶Special requirements apply in the case of belt drive and cardan shaft. Please contact u

Size			NG		28	40	56	71	90	125
Torque at Vg max and	Δp = 5800 psi¹⁾		T	lb-ft	131	188	263	333	423	587
Torque at Vg max and	Δp = 400 bar¹⁾		T	Nm	178	255	357	452	573	796
Maximum input torque at drive shaft²⁾ ANSI B92.1a (SAE J744)		S	T_E_max	lb-ft	232	444	444	444	1210	1210
				Nm	314	602	602	602	1640	1640
				in	1	1 1/4	1 1/4	1 1/4	1 3/4	1 3/4
		T	T_E_max	lb-ft	-	-	715	715	-	1969
				Nm	-	-	970	970	-	2670
				in	-	-	1 3/8	1 3/8	-	2
		U³⁾	T_E_max	lb-ft	-	232	-	-	444	-
				Nm	-	314	-	-	602	-
				in	-	1	-	-	1 1/4	-
Maximum through-drive torque⁴⁾			T_D_max	lb-ft	170	232	384	487	606	819
Maximum through-drive torque⁴⁾			T_D_max	Nm	231	314	521	660	822	1110

Distribution of torques

Torque at 1st pump	T₁
Torque at 2nd pump	T₂
Torque at 3rd pump	T₃
Input torque	T_E=T₁₊T₂₊T₃
Input torque	T_E< T_{E max}
Through∙drive torque	T_D=T₂₊T₃
Through∙drive torque	T_D< T_{D max}

1) Efficiency not considered

2) For drive shafts free of radial force

3) Shaft "U" is only permitted as drive shaft on the 2nd pump on a combination pump of the same size.

4)Note maximum input torque for shaft S!

Closed Loop Variable Displacement Piston Pump AA4VG

Detailed description

Type code

Axial piston unit

Operating mode

Size(NG)

Control device

Pressure cut-off

Neutral position switch

Mechanical stroke limiter

Stroking chamber pressure port

DA control valve

Series

Direction of rotation

Sealing material

Drive shaft

Mounting flange

Working port

Boost pump

Through drives3)

Filtration boost circuit/external boost pressure supply

Swivel angle sensor

Connector for solenoids8)

Standard / special version

Notice

Technical data

Notice

Determining the operating characteristics

Key

Permissible radial and axial forces on the drive shaft

Notice

Distribution of torques

Through drives³⁾

Connector for solenoids⁸⁾