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 Text on Five-Star Motors

Five-star motors have long been widely used in our daily work and life. However, when some of these devices are used too frequently, they are prone to malfunctions. Below is a brief explanation of how to test the performance of a five-star motor:

Compared with a pump, a motor operates in the reverse manner. A pump drives hydraulic oil, while a motor is driven by hydraulic oil. A motor converts hydraulic energy into mechanical energy to perform work.

The channel that allows leakage oil to return to the oil tank is called a leakage channel. This provides us with a method to test the performance of a piston motor by comparing the actual amount of oil leaking from the motor housing with the standard oil amount specified in the test. The greater the leakage, the greater the energy loss, which in turn leads to a decrease in motor performance.

What adverse effects does excessive slipping of a five-star motor have on the motor itself? The piston and cylinder block inside a small hydraulic motor will be scratched, resulting in increased leakage and loss of power.