Features of QJM Hydraulic Motor

The QJM series hydraulic motor can be combined with various oil pumps, valves, and hydraulic accessories to form a hydraulic rotation device, which is adaptable to a wide range of mechanical working conditions. This hydraulic motor boasts a series of advantages, including light weight, compact size, wide speed regulation range, excellent low-speed stability, reliable operation, impact resistance, high efficiency, and long service life. Its main features are as follows:

The rolling element of this motor uses a single steel ball instead of the two or more rollers and crossbeams used in conventional internal-curve hydraulic motors. As a result, it features a simple structure, reliable operation, compact size, and light weight.

With a small moment of inertia and a robust, reliable steel ball, the motor can operate continuously under impact loads.

It has low friction: the oil distribution shaft and rotor are internally balanced; the ball-plunger pair transmits force through a ball pad made of self-lubricating composite material, with hydrostatic balance and good lubrication conditions. A soft plastic piston ring that automatically compensates for wear is used to seal high-pressure oil. Thus, the motor achieves high mechanical and volumetric efficiency, can operate stably at extremely low speeds, and delivers a large starting torque.

Due to its structural characteristics, the motor requires a relatively low return oil backpressure (generally 0.3–0.8 MPa). The higher the rotational speed, the greater the required backpressure.

This motor is available with two-speed and three-speed displacement control, providing a wide speed regulation range.

It has a simple structure, enabling easy disassembly and maintenance. There are no special requirements for oil cleanliness, and the oil filtration precision can be selected according to the requirements of the matched oil pump.

Translation of Hydraulic Motor-Related Text

Vane hydraulic motors are compact in size, have low torque, and feature sensitive response, making them suitable for applications with high commutation frequency. However, they have relatively large leakage and unstable operation at low speeds. Therefore, vane hydraulic motors are generally used in scenarios requiring high speed, low torque, and sensitive response.

What should be the installation tilt angle of the vanes in a hydraulic motor?

Since hydraulic motors are actuators that typically require bidirectional operation, their structure must be completely symmetrical during installation. Consequently, the installation tilt angle of the vanes is zero.

For piston hydraulic motors, when tilted at an angle of 2° to 15° relative to the line toward the center of the circle: a larger tilt angle ensures stable high-speed performance; a smaller tilt angle leads to reduced stability, but the motor has a more compact size with the same displacement, making it an economical option.

The main business of Mingrui Hydraulics includes: piston hydraulic motor product series (including cycloid hydraulic motors, internal five-star hydraulic motors, etc.) and crawler chassis product series (hydraulic crawler chassis, rubber crawler chassis, etc.). Its products are sold across China, and customers are welcome to visit (the original text is incomplete, so the translation ends here).