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Item # 70AV, 7.0 Cubic Inch Per Revolution (in³/rev) Displacement Axial Vane Hydraulic Motor

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The ultimate hydraulic design for smooth, precise, repeatable positioning applications such as robotics.




Specifications  · Dimensions  · Advantages  · Benefits  · Industrial Series  · Servo Series  · How the Axial Vane Motors Work  · Hydraulic Motor Options  · Motors with Brakes  · Motor/Gear Box Packages  · Options  · Additional Information

Specifications

Brands
Von Ruden®

Displacement
7.0 in³/rev

Operating Continuous Pressure Δ
2000 psi

Operating Intermittent Pressure Δ
2000 psi

Maximum Continuous Speed
1350 rpm

Maximum Continuous Flow
40.9 gpm

Maximum Intermittent Speed
1500 rpm

Maximum Intermittent Flow
45.5 gpm

Continuous Theoretical Torque
2229 lb·in

Continuous Theoretical Torque at 100 Pounds Per Square Inch (psi) Pressure
111.4 lb·in

Theoretical Power at Continuous Speed and Pressure
47.7 hp

Weight
52 lb

Volume of Oil Under Compression
5.60 in³

Capacity
16 to 115 cm³

Inertia WK2
17.7 lb·in²

Note for Operating Characteristics
  1. Running torque approximately 94% of the theoretical
  2. Stall torque approximately 98% of theoretical
  3. Volumetric efficiency up to 98% depending on speed and pressure
  4. Case drain line not to exceed 25 PSI (optional seals available for 250 PSI)
  5. Intermittent conditions to be less than 10% of every minute
  6. Inlet and return pressures not to exceed the ratings listed above
Shaft will turn clockwise with pressure applied to port (A).

Low Speed High Torque Hydraulic Motor Type
Vane

Industrial Motor Series
10
10A
25
35
50
70

Servo Motor Series
10AS
10S
25S
35S
50S
70S

Motor Shaft
K = Standard Keyed Shaft

R = Splined Shaft to Fit 200 Gear Box - Special Mtg. To 200(Note: When Ordering Replacement Only)

M = Splined Shaft to Fit Radial Load Adaptor (21 Tooth, 20/40 Dp)

U = Splined Shaft (15 Tooth, 16/32 Dp)
Involute (Optional with - 18 Mounting Flange)

Note for Motor Shaft
Omit if motor/gear box

Gear Box
- 2 = MODEL 200

Total Reduction
05 = 5:1
06 = 6:1
07 = 7:1
08 = 8:1
10 = 10:1

Gear Box Shaft
A = 2-1/8 Keyed Std. Length
B = 16 Tooth 8/16 D.p. 2.125" Dia.
C = 1-7/8 Keyed
D = 13 Tooth 8/16 D.p. 1.75" Dia.

Brake
222
223
224
225

Brake with Tach Adaptor Shaft
222S
223S
224S
225S

Holding Capacities 250 Pound Per Square Inch (in) Release
940
1410
1885
2355

Holding Capacities 125 Pound Per Square Inch (in) Release
470
705
940
1177


Dimensions

Dimension A
6.785 in

Dimension B
1.125/1.124 in

Dimension C
0.250/0.125 in

Dimension D
3 in

Dimension E
2 in

Dimension F
0.968 in

Dimension G
1-5/16-12 in

Dimension H
3.7 in

Dimension I
7.6 in


Advantages
Compare with the others - only Von Ruden® Axial Vane hydraulic motors offer all of these advantages.
  1. Hold Position Repeatedly and Accurately
    The case drain leakage in Von Ruden® Axial Vane motors is so low that servo valves can easily compensate for it. Case drain leakage is limited to the amount of fluid that can pass through the very tight diametral clearance between the rotor shaft and journal bearings.
    In servo systems cross port leakage is effectively zero since servo valves apply equal pressure to both motor ports when in the "null" position.
  2. Mechanically "Stiff" when Locked
    Rigid one piece rotor and shaft.
    No internal backlash from keys, splines or gears.
  3. Smooth Starts and Smooth Slow Speed Operation
    Low torque and speed ripple. Breakaway pressure is typically less than 10 psi.
    Mechanically Smooth since:
    • Rotor is 360º pressure balanced.
    • The diametral clearance between the vanes and housing is fixed. There is no metal-to-metal contact.
    • The design incorporates only a few rotating parts.
    • All bearings are pressure lubricated.
  4. Long Life
    A fixed diametral clearance exists between the rotor veins and housing instead of metal-to-metal contact.
    All other rotating parts are pressure lubricated operating on a definite oil film.
    Extremely long life can be expected when properly applied within recommended operating specifications.
    External radial or thrust loads must not be applied to the output shaft.
  5. High Starting Torque
    Typically 97% of the theoretical at rated pressure.
    Due to their mechanical smoothness.
  6. Manifold Port Capability
    For direct valve mounting.
    Or for use with Von Ruden® optional crossover relief valves.


Benefits
  • Case drain leakage is so low that a servo valve can easily control speed and position.
  • Fewer wearing parts, exceptional life.


Industrial Series
Our standard series, with performance suitable for most high performance industrial applications.


Servo Series
For more demanding applications requiring the highest level of performance.
Servo series motors are obtained by:
  • A tighter diametral "select fit" between the housing and rotor vane assembly.
  • Additional production test requirements. Torque ripple variation, mechanical binding, total cross port leakage and the variation of cross port leakage within a revolution must all be within tight specific limits.


How the Axial Vane Motors Work
Pressure acting on vanes #1 and #4 causes rotation in the clock wise direction and pressure balances the rotor.
Vanes #2 and #5 are inactive in the position shown.
Vanes #3 and #6 have been rotated to the position shown to clear steps on the housing.


Hydraulic Motor Options
  • Choice of motor output shafts
  • Motor mounted dual relief valves
  • Rotor shaft extensions
  • SAE "B" flange mount
  • Tach generator packages


Motors with Brakes
  • Brakes mounted directly on rear of motors.
  • Normally-on brakes with hydraulic pressure release.
  • Optional brake torque capacities.


Motor/Gear Box Packages
  • Gear box torque capacities to 25,000 lb-inches.
  • Gear box ratios up to 10:1.
  • Choice of gear box output shafts.


Options
Dual Relief Valves (-12 Option)
Foot Mounting Bracket (Part No. 60549)
Four Bolt Flange
Radial Load Adaptor (-20 Option)
Rear Shaft Extension (-49 Option)
Tach Package (-32 Option)


Additional Information
Now, a single source for pre-engineered drive packages.
  • Single source responsibility
  • Pre-engineered and tested
  • Reduce your development time
  • Reduce your assembly time
  • Eliminate duplicate shafts and bearings
  • Reduce envelope dimensions
  • Reduce your overall cost
Fluid Cleanliness
A cleanliness of ISO 18/15 (NAS 1638 Class 9, or SAE 749D, Class 6) should be maintained prior to and during operation. A nominal filtration of 25 microns or better is recommended.

Fluids
MOTORS-High grade mineral base hydraulic oil with 75-400 SSU viscosity is recommended. Fluid temperature should be between -40º and 160ºF. Seals are also available for fire resistant fluids such as phosphate esther.

GEARBOX-90 wt. lub. oil above 20ºF; 80 wt. below 20ºF.

Braking Circuits
For hydraulic surge pressure, applied to or generated by the motor, a close coupled direct acting relief valve must be provided in the circuit. This will keep these surges from exceeding the maximum pressure rating.

Overrunning Loads
The inlet must be provided with sufficient oil to prevent cavitation in overrunning loads.

Radial Loads (Output Shaft)
The Axial Vane motors must be protected from any side loads. In applications where this cannot be avoided a radial load adapter must be used.

Start Up of a New System
Be certain the case is full of oil before starting the motor. The case may be filled through the case filling and flushing port. The case may also be filled by subjecting the motor to 200 to 500 PSI "null pressures" (pressure on both ports) with the case filling and flushing port plug back out slightly. When oil begin to flow out of this port, with motor horizontal, the case is assumed to full.
A filter installed in the inlet line is recommended for the first 15 minutes of operation in a new system.

"Null Pressure" (Pressure on Both Ports)
If during Operation, "Null Pressure" are expected to exceed 2000 PSI, connect the case filling and flushing port to a relief valve set at 1000 PSI and drain to the reservoir with a 3/8-inch I.D. line.

Blocked Center Valves
Whenever a block center valve is used, crossover relief valves should be included to protect the motor from excessive pressure surges.


 MORE IMAGES 

·  Model 70 Axial Vane Hydraulic Motor Typical Performance Characteristics


 DOWNLOADS 

Brochure for Axial Vane Hydraulic Motors and Planetary Gear Boxes
(PDF, 1288KB)