- You do not have any products in your shopping cart yet.
CPRM Hydraulic motor
CPRM hydraulic motors deliver maximum performance in the smallest space and are ideal for demanding mobile as well as stationary applications. The compact gerotor motors impress with high torque, low starting resistance, and high efficiency thanks to spool valve technology. Learn more...
1 to 16 (from a total of 59)
With a wide variety of shaft, flange, and port options, the motors can be precisely adapted to individual requirements – perfect for precise torque and speed control in vehicle and machinery drives. Our CPRM hydraulic motors are interchangeable with hydraulic motors from manufacturers such as Danfoss, Eaton, White, Bosch-Rexroth, etc.
Frequently Asked Questions (FAQ) about the CPRM Hydraulic Motor
What are the main features of the CPRM hydraulic motors?
The CPRM hydraulic motors are designed as spool valve motors with geroller design, which allows for low starting torque and high efficiency. They feature a compact design, making them ideal for tight installation spaces. An internal check valve is integrated, allowing use without a case drain connection. As standard, the motors are equipped with a high-pressure shaft seal rated up to 150 bar.What different shaft configurations are available for the CPRM motors and what are their torque limits?
Various shaft configurations are available for CPRM motors, each with different maximum torque ratings:- C-shaft (Ø 25 mm cylindrical with key A8 x 7 x 32): Max. torque 34 daNm.
- Co-shaft (Ø 25.4 mm (1") cylindrical with key ¼" x ¼" x 1¼"): Max. torque 34 daNm.
- SH-shaft (splined SAE 6B): Max. torque 40 daNm.
- K-shaft (tapered 1:10 with key B5 x 5 x 14): Max. torque 40 daNm.
- CB-shaft (Ø 32 mm cylindrical with key A10 x 8 x 45): Max. torque 77 daNm.
- SB-shaft (Ø 31.75 mm splined, 14 teeth, DP 12/24): Max. torque 77 daNm.
- S-shaft (Ø 31.75 mm (1¼") splined, 14 teeth, DP 12/24): Max. torque 77 daNm.
- C1-shaft (Ø 1¼" cylindrical with key ⁵⁄16" x ⁵⁄16" x 1¼"): Max. torque 77 daNm.
- Ka-shaft (tapered 1:8, SAE J 501, with key ⁵⁄16" x ⁵⁄16" x 1¼"): Max. torque 77 daNm.
What is the difference between continuous, intermittent, and peak operation for CPRM motors?
These terms describe the permissible operating conditions of the motor:- Continuous operation (Cont.): Maximum values at which the motor can safely operate over extended periods without interruption.
- Intermittent operation (Int.): Performance values for a maximum operating time of 6 seconds per minute; allows for higher short-term loads.
- Peak operation (Peak): Very short-term loads up to a maximum of 0.6 seconds per minute; the highest torque and pressure differential can be reached here.
What are the advantages of a case drain connection for the CPRM hydraulic motor?
Although the CPRM motor can be used without a case drain connection thanks to an internal check valve, routing the leakage oil from the case offers several advantages:- Flushing: Drained leakage oil carries away contaminants that may accumulate in the case.
- Cooling: Removing leakage oil helps regulate the motor temperature and prevent overheating.
- Seal life extension: Effective leakage oil removal reduces pressure in the seal area, contributing to longer shaft seal life.
How is the rotation direction of a CPRM hydraulic motor defined as standard, and can it be changed?
The standard rotation direction of the CPRM hydraulic motor is clockwise when port "A" is pressurized. If port "B" is pressurized instead, the motor rotates counterclockwise. A reversed rotation direction can be selected as an option when ordering.What factors must be considered when using the motor in vehicles to calculate tractive effort and torque?
When using CPRM motors in vehicles to calculate drive and tractive effort, the following key factors must be considered:- Vehicle speed and gear ratio: Determines the required motor speed.
- Rolling resistance (RR): Resistance force due to wheel contact with the surface (depends on vehicle gross weight and surface rolling resistance coefficient).
- Grade resistance (GR): Force needed to overcome inclines (depends on gross weight and slope angle).
- Acceleration force (Fa): Force to accelerate the vehicle from 0 to maximum speed within a specified time.
- Additional tractive effort (dP): In trailer operation, the additional pulling force of the trailer must be considered.
- Total tractive effort (TE): Sum of the above forces, increased by 10 % for air resistance.
- Motor torque (M): Required torque per hydraulic motor, calculated from total tractive effort, wheel rolling radius, number of motors, gear ratio, and mechanical efficiency of the transmission.
- Wheel adhesion (MW): Must be greater than motor torque to avoid wheel slip (depends on weight over the wheels and surface friction coefficient).
What connection types and mounting flanges are available for the CPRM motors?
The CPRM motors offer various options for connections and mounting flanges to allow flexible integration:Mounting flanges:
- Oval flange (2-bolt, SAE A)
- Magneto flange (4-bolt)
- Square flange (4-bolt)
Connection types (for main ports P(A,B) and case drain port T):
- G ½" / G ¼"
- M22 x 1.5 / M14 x 1.5
- ⁷⁄8-14 O-Ring / ⁷⁄16-20 UNF
- ½-14 NPTF / ⁷⁄16-20 UNF
Port positions: Side ports are standard; end ports are available upon request.
What options are available for the shaft seal and how does this affect the maximum return pressure?
There are two main shaft seal options for CPRM motors:- High-pressure shaft seal up to 150 bar (standard): Standard design, sufficient for most applications.
- High-pressure shaft seal 200 bar: For applications requiring higher pressures.
The maximum return pressure depends on whether a case drain line is used:
- Without case drain line or maximum pressure in the case drain line: Max. return pressure 160 bar in continuous operation, 175 bar short-term, and 210 bar peak.
- With case drain line: The maximum return pressure is significantly higher and is influenced by the seal specifications.