CPMT Hydraulic motors

The CPMT hydraulic motor is designed for efficiency and durability:

• Planetary roller motor with disc valve: Ensures low starting torque and high efficiency.
• Optimized for small spaces: Ideal for applications with limited space.
• Internal check valve: Simplifies installation by eliminating the need for an external check valve.
• Operation without a drain line possible: Offers flexibility in system design.
• Tapered roller bearings for high radial load: Provides robustness and long service life.

A comprehensive application calculation guide is available in the CPMT hydraulic motor documentation. The calculation considers factors such as:

• Vehicle speed and wheel rolling radius: To determine the required motor speed.
• Rolling resistance and grade resistance: To calculate forces opposing vehicle motion.
• Acceleration force and drawbar pull: To account for dynamic loads.
• Total tractive effort: The total force required to move the vehicle.
• Motor torque and tire-road cohesion: To ensure adequate traction.
• Radial motor load: To select a motor that can handle the load.

By following the calculation steps, you can determine the appropriate motor size based on your specific vehicle parameters.

CPMT motors offer a variety of output shafts to meet different requirements:

• Cylindrical shafts with keys: Available in Ø 40 mm and Ø 38.1 mm (1 1/2").
• Power take-off shaft: Ø 34.85 mm, compliant with DIN 9611 Form 1.
• Splined shaft: Ø 1 1/2", 17 teeth, DP 12/24, ANSI B92.1-1976.
• Tapered shafts with keys: Available with tapers of 1:10 and 1:8.

Each shaft type has a defined maximum torque capacity.

CPMT motors are equipped with tapered roller bearings that allow them to handle large axial and radial loads. The allowable radial shaft load is determined by the distance between the point of load application and the mounting surface. The product documentation includes a diagram showing the maximum allowable radial load and permissible loads for a service life of 3000 hours at 200 rpm.

Yes, the standard rotation direction can be reversed. By default, the motor rotates clockwise when port A is pressurized and counterclockwise when port B is pressurized. To reverse the direction of rotation, simply switch the pressure port. The ordering information section of the documentation describes how to specify the reversed rotation direction when placing an order.

Although the CPMT motor can be used without a drain line due to its internal check valves, using a drain line offers several advantages:

• Cleaning: The drain line removes contaminants from inside the motor, promoting longevity.
• Cooling: Oil flow through the drain line helps dissipate heat and lower operating temperature.
• Extended seal life: Reducing the return pressure with a drain line minimizes stress on the shaft seal, thereby extending its service life.

The maximum return pressure varies depending on operating conditions and whether a drain line is used.

• Without a drain line: The maximum return pressure depends on the motor speed. Specific values can be found in the "Return Pressure" table in the catalog.
• With a drain line: The maximum return pressure is generally higher. Refer to the catalog for applicable limits.

For CPMTS short motors, the maximum pressure is limited by the specifications of the attached gearbox.

CPMT motors offer flexibility in mounting with various flange options:

• Square flange (4 holes)
• SAE C flange (4 holes)
• Wheel flange

Additionally, short versions with square flanges or without flanges are available. The catalog includes detailed dimensions for each mounting option.