A10VER series 52

Specially developed for hydrostatic fan drives
The A10VER variable motor is equipped with an overcenter rotary group with a maximum displacement of +/- 100 % Vg max. This allows reversing operation without the need for costly additional components to reverse the air flow and to clean the cooler from contaminations which leads to fuel savings due to improved cooling performance.
The energy efficiency of hydraulic fan drives is increased due to the elimination of external reversing valves.
Robust bearing for long service life
High maximum permissible output speed
Favorable power-to-weight ratio – compact dimensions
Low noise
Swashplate design

Table of values

Size				18	23	28	37	45
Displacement		+100 % Vg max	cm³	18	23	28	37	45
Displacement		-100 % Vg max	cm³	18	23	28	37	45
Nominal pressure		pnom	bar	280	280	280	280	280
Maximum pressure		pmax	bar	350	350	350	350	350
Rotational speed 1)	maximum, at Vg max	nnom	rpm	3000	3000	3000	2200	2000
Rotational speed 1)	minimum, at permanent operation	nmin	rpm	250	250	250	250	250
Torque	at Vg max and pnom	M	Nm	80	102	125	165	200
Rotary stiffness of drive shaft	C	c	kNm/rad	24.16	24.16	24.16	32.38	32.38
Rotary stiffness of drive shaft	Y	c	kNm/rad	24.16	24.16	24.16	32.38	32.38
Moment of inertia for rotary group		JTW	kg·m²	0.0017	0.0017	0.0017	0.0033	0.0033
Maximum angular acceleration 2)		a	rad/s²	5500	5500	5500	4000	4000
Case volume		V	l	0.6	0.6	0.6	0.7	0.7
Weight (approx.)		m	kg	14	14	14	18	18

1)	These values are valid at: - an absolute pressure of pabs = 2 bar at low-pressure port A - for the optimum viscosity range from vopt = 36 to 16 mm2/s - with hydraulic fluid based on mineral oils
2)	The data are valid for values between the minimum required and maximum permissible rotational speed. It applies for external stimuli (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 connection parts must be considered.

Notice

The table values are theoretical values without consideration of efficiencies and tolerances. The values are 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 recommends testing the loads by means of experiment or calculation / simulation and comparison with the permissible values.

Determining the operating characteristics
Inlet flow		[l/min]
Rotational speed		[rpm]
Torque		[Nm]
Power		[kW]

Key
Vg	Displacement per revolution [cm3]
Δp	Differential pressure [bar]
n	Rotational speed [rpm]
ηv	Volumetric efficiency
ηhm	Hydraulic-mechanical efficiency
ηt	Total efficiency (ηt = ηv • ηhm)

Hydraulic fluid

The axial piston unit is designed for operation with HLP mineral oil according to DIN 51524. See the following data sheet for application instructions and requirements for selecting hydraulic fluid, behavior during operation as well as disposal and environmental protection before you begin project planning:

90220:Hydraulic fluids based on mineral oils and related hydrocarbons

90221: Environmentally acceptable hydraulic fluids

Selection of hydraulic fluid

Bosch Rexroth evaluates hydraulic fluids on the basis of the Fluid Rating according to the technical data sheet 90235.

Hydraulic fluids with positive evaluation in the Fluid Rating are provided in the following technical data sheet:

90245: Bosch Rexroth Fluid Rating List for Rexroth hydraulic components (pumps and motors)

The hydraulic fluid should be selected so that the operating viscosity in the operating temperature range is within the optimum range (νopt; see selection diagram).

Viscosity and temperature of hydraulic fluids

	Viscosity	Shaft seal	Temperature1)	Comment
Cold start	νmax ≤ 1600 mm²/s	FKM	ϑSt ≥ -25 °C	t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 rpm, permissible temperature difference between axial piston unit and hydraulic fluid max. 25 K
Warm-up phase	ν = 400 … 1600 mm²/s			t ≤ 15 min, p ≤ 0.7 • pnom and n ≤ 0.5 • nnom
Continuous operation	ν = 10 … 400 mm²/s2)	FKM	ϑ ≤ +110 °C	measured at port L
	νopt = 16 … 36 mm²/s			range of optimum operating viscosity and efficiency
Short-term operation	νmin = 7 … 10 mm²/s	FKM	ϑ ≤ +110 °C	t ≤ 3 min, p ≤ 0.3 • pnom measured at port L

1)	If the specified temperatures cannot be maintained due to extreme operating parameters, please contact us.
2)	Equates e.g. with the VG 46 a temperature range of +5 °C to +85 °C (see selection diagram)

Selection diagram

Notice

For applications in the low-temperature range down to -40°C, please contact us.

Filtration of the hydraulic fluid

Finer filtration improves the cleanliness level of the hydraulic fluid, which increases the service life of the axial piston unit.

A cleanliness level of at least 20/18/15 is to be maintained according to ISO 4406.

At a hydraulic fluid viscosity of less than 10 mm²/s (e.g. due to high temperatures in short-term operation) at the drain port, a cleanliness level of at least 19/17/14 according to ISO 4406 is required.

For example, the viscosity is 10 mm²/s at:

HLP 32 a temperature of 73°C

HLP 46 a temperature of 85°C

Operating pressure range

Pressure at working port B			Definition
Nominal pressure	pnom	280 bar	The nominal pressure corresponds to the maximum design pressure. The series control of motors is not permissible.
Maximum pressure	pmax	350 bar	The maximum pressure corresponds to the maximum operating pressure within the single operating period. The sum of the single operating periods must not exceed the total operating period.
Single operating period		2.5 ms
Total operating period		300 h
Minimum pressure	pB abs	20 bar	Minimum pressure on the high-pressure side (port B) which is required in order to prevent damage to the axial piston unit.
Reversing pressure (high-pressure side)	pRev abs	<50 bar	The Δ pressure between A and B at which the system switches from fan operation to reversing operation and then from reversing operation back to fan mode is between 30 to 45 bar relative. The pressure in B must be less than 50 bar.
Rate of pressure change	RA max	16000 bar/s	Maximum permissible rate of pressure build-up and reduction during a pressure change over the entire pressure range.
Pressure at the low-pressure port A			Definition
Minimum pressure	pND min	2 bar absolute	Minimum pressure at the low-pressure port A (outlet) that is required in order to avoid damage to the axial piston unit.
Maximum pressure	pND max	30 bar absolute
Case pressure at port L			Definition
Maximum pressure Operation as a motor, open circuit	pL max	2 bar

Notice

Working pressure range applies when using mineral oil-based hydraulic fluids. Please contact us for values for other hydraulic fluids.

In addition to the hydraulic fluid and the temperature, the service life of the shaft seal is influenced by the rotational speed of the axial piston unit and the case pressure.

The case pressure must be greater than the ambient pressure.

Pressure definition

1)	Total operating period = t1 + t2 + ... + tn

Rate of pressure change

Direction of flow

Motor direction of rotation with unchanged pressure side B	at Vg max + +100 %	at Vg max - -100 %
(de-energized) clockwise	B to A
(energized) counter-clockwise		B to A

Permissible radial and axial forces of the drive shaft

Size			18	23	28	37	45
Maximum radial force with distance a/2 (to the shaft collar)	Fq max	N	1200	1200	1200	1500	1500
Maximum axial force	- Fax max	N	1000	1000	1000	1500	1500

Notice

The values given are maximum values and do not apply to continuous operation.

For output drives with radial loading, please contact us.

Size	18	23	28	37	45
Displacement	+100 % Vg max	cm³	18	23	28	37	45
-100 % Vg max	cm³	18	23	28	37	45
Nominal pressure	pnom	bar	280	280	280	280	280
Maximum pressure	pmax	bar	350	350	350	350	350
Rotational speed 1)	maximum, at Vg max	nnom	rpm	3000	3000	3000	2200	2000
minimum, at permanent operation	nmin	rpm	250	250	250	250	250
Torque	at Vg max and pnom	M	Nm	80	102	125	165	200
Rotary stiffness of drive shaft	C	c	kNm/rad	24.16	24.16	24.16	32.38	32.38
Y	c	kNm/rad	24.16	24.16	24.16	32.38	32.38
Moment of inertia for rotary group		JTW	kg·m²	0.0017	0.0017	0.0017	0.0033	0.0033
Maximum angular acceleration 2)		a	rad/s²	5500	5500	5500	4000	4000
Case volume		V	l	0.6	0.6	0.6	0.7	0.7
Weight (approx.)		m	kg	14	14	14	18	18

Determining the operating characteristics
Inlet flow		[l/min]
Rotational speed		[rpm]
Torque		[Nm]
Power		[kW]

Key
Vg	Displacement per revolution [cm3]
Δp	Differential pressure [bar]
n	Rotational speed [rpm]
ηv	Volumetric efficiency
ηhm	Hydraulic-mechanical efficiency
ηt	Total efficiency (ηt = ηv • ηhm)

	Viscosity	Shaft seal	Temperature1)	Comment
Cold start	νmax ≤ 1600 mm²/s	FKM	ϑSt ≥ -25 °C	t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 rpm, permissible temperature difference between axial piston unit and hydraulic fluid max. 25 K
Warm-up phase	ν = 400 … 1600 mm²/s			t ≤ 15 min, p ≤ 0.7 • pnom and n ≤ 0.5 • nnom
Continuous operation	ν = 10 … 400 mm²/s2)	FKM	ϑ ≤ +110 °C	measured at port L
	νopt = 16 … 36 mm²/s			range of optimum operating viscosity and efficiency
Short-term operation	νmin = 7 … 10 mm²/s	FKM	ϑ ≤ +110 °C	t ≤ 3 min, p ≤ 0.3 • pnom measured at port L

Pressure at working port B	Definition
Nominal pressure	pnom	280 bar	The nominal pressure corresponds to the maximum design pressure. The series control of motors is not permissible.
Maximum pressure	pmax	350 bar	The maximum pressure corresponds to the maximum operating pressure within the single operating period. The sum of the single operating periods must not exceed the total operating period.
Single operating period	2.5 ms
Total operating period	300 h
Minimum pressure	pB abs	20 bar	Minimum pressure on the high-pressure side (port B) which is required in order to prevent damage to the axial piston unit.
Reversing pressure (high-pressure side)	pRev abs	<50 bar	The Δ pressure between A and B at which the system switches from fan operation to reversing operation and then from reversing operation back to fan mode is between 30 to 45 bar relative. The pressure in B must be less than 50 bar.
Rate of pressure change	RA max	16000 bar/s	Maximum permissible rate of pressure build-up and reduction during a pressure change over the entire pressure range.
Pressure at the low-pressure port A	Definition
Minimum pressure	pND min	2 bar absolute	Minimum pressure at the low-pressure port A (outlet) that is required in order to avoid damage to the axial piston unit.
Maximum pressure	pND max	30 bar absolute
Case pressure at port L	Definition
Maximum pressure Operation as a motor, open circuit	pL max	2 bar

Motor direction of rotation with unchanged pressure side B	at Vg max + +100 %	at Vg max - -100 %
(de-energized) clockwise	B to A
(energized) counter-clockwise		B to A

Size	18	23	28	37	45
Maximum radial force with distance a/2 (to the shaft collar)		Fq max	N	1200	1200	1200	1500	1500
Maximum axial force		- Fax max	N	1000	1000	1000	1500	1500

1)	Additional sizes available on request
2)	Additional directions of rotation available on request
3)	Specify type code of sensor DSM according to data sheet 95132 and/or DSA 95133 separately and observe the requirements on the electronics.

Notice

Observe the information in the project planning notes chapter.

Please note the information on project planning and commissioning of the axial piston variable motor A10VER in the project planning instructions 90363.

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

Sizes 18, 23, 28

EZ6/EZ7 - Two-point control with DEUTSCH connector
Clockwise rotation
Port plate 10N00/60N00

Tapered shaft with shaft key

C - Shaft with UNF threaded bolt
Y - Shaft with metric threaded bolt

1)	Thread according to ASME B1.1
2)	Thread according to DIN 13
3)	For maximum tightening torques, see instruction manual.

Ports and fastening threads port plate 10

Size			18	23	28
A	Working port (high-pressure series)	Size	3/4 in
		Standard 1)	SAE J518
		Fastening thread 2)	M10 × 15; 17 mm deep
		State on delivery	With protective cover (must be connected)
B	Working port (high-pressure series)	Size	3/4 in
		Standard 1)	SAE J518
		Fastening thread 2)	M10 × 15; 17 mm deep
		State on delivery	With protective cover (must be connected)
L or L1	Drain port	Size	3/4-16UNF-2B; 15 mm deep
		Standard 3)	ISO 11926
		State on delivery	With protective cover (observe installation instructions)

1)	Metric fastening thread is a deviation from standard.
2)	Thread according to DIN 13
3)	The spot face can be deeper than specified in the appropriate standard.

Ports and fastening threads port plate 60

Size			18	23	28
A	Working port (high-pressure series)	Size	3/4 in
		Standard	SAE J518
		Fastening thread 1)	3/8-16UNC-2B; 21 mm deep
		State on delivery	With protective cover (must be connected)
B	Working port (high-pressure series)	Size	3/4 in
		Standard	SAE J518
		Fastening thread 1)	3/8-16UNC-2B; 21 mm deep
		State on delivery	With protective cover (must be connected)
L or L1	Drain port	Size	3/4-16UNF-2B; 15 mm deep
		Standard 2)	ISO 11926
		State on delivery	With protective cover (observe installation instructions)

1)	Thread according to ASME B1.1
2)	The spot face can be deeper than specified in the appropriate standard.

Size 37, 45

EZ6/EZ7 - Two-point control with DEUTSCH connector
Clockwise rotation
Port plate 10N00/60N00

Tapered shaft with shaft key

C - Shaft with UNF threaded bolt
Y - Shaft with metric threaded bolt

1)	Thread according to ASME B1.1
2)	Thread according to DIN 13
3)	For information on the tightening torques, refer to the instruction manual.

Ports and fastening threads port plate 10

Size			37	45
A	Working port (high-pressure series)	Size	3/4 in
		Standard 1)	SAE J518
		Fastening thread 2)	M10 × 15; 17 mm deep
		State on delivery	With protective cover (must be connected)
B	Working port (high-pressure series)	Size	3/4 in
		Standard 1)	SAE J518
		Fastening thread 2)	M10 × 15; 17 mm deep
		State on delivery	With protective cover (must be connected)
L	Drain port	Size	7/8-14UNF-2B; 17 mm deep
		Standard 3)	ISO 11926
		State on delivery	With protective cover (observe installation instructions)

1)	Metric fastening thread is a deviation from standard.
2)	Thread according to DIN 13
3)	The spot face can be deeper than specified in the appropriate standard.

Ports and fastening threads port plate 60

Size			37	45
A	Working port (high-pressure series)	Size	3/4 in
		Standard	SAE J518
		Fastening thread 1)	3/8-16UNC-2B; 21 mm deep
		State on delivery	With protective cover (must be connected)
B	Working port (high-pressure series)	Size	3/4 in
		Standard	SAE J518
		Fastening thread 1)	3/8-16UNC-2B; 21 mm deep
		State on delivery	With protective cover (must be connected)
L	Drain port	Size	7/8-14UNF-2B; 17 mm deep
		Standard 2)	ISO 11926
		State on delivery	With protective cover (observe installation instructions)

1)	Thread according to ASME B1.1
2)	The spot face can be deeper than specified in the appropriate standard.

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A10VER series 52

Table of values