Product Features

The YMS hydraulic motor is an internal-curve, multi-acting radial piston motor. Its main features are as follows:

Modular Design: The overall structure adopts a modular design with a plate-type stacking configuration. It is divided into four parts: the mechanical output module, hydraulic function module, oil distribution module, and mechanical braking module, facilitating compatibility with various mainstream optimized supporting systems.

High Efficiency: It adopts flat oil distribution technology, which has low sensitivity to pressure and temperature. This technology automatically compensates for wear between the oil distribution friction pairs, ensuring the motor maintains high volumetric efficiency for a long time. Meanwhile, the adoption of a roller-plunger structure simplifies the force transmission mechanism and improves mechanical efficiency.

High Operating Pressure and Excellent Low-Speed Performance: The stator curve design has been optimized to ensure output torque and stable rotational speed while reducing stator contact stress. Additionally, the stator is manufactured using new materials and processes, significantly increasing the operating pressure of the hydraulic motor, with a maximum pressure of up to 40 MPa. Due to the low inertia of the force transmission mechanism, the plunger pair is equipped with a sealed piston ring, and the roller stopper is made of friction-reducing material, the motor achieves high starting efficiency and excellent low-speed performance.

Ability to Withstand Radial and Axial Loads: With an independently arranged mechanical output module, as well as a large-diameter output shaft and bearings, the motor can withstand large axial and radial forces. It can be directly connected to a gear output or installed directly on the drive wheel of a vehicle.

Optional Mechanical Brake: It adopts a modular plate-type structure, which allows the integration of a mechanical braking device to achieve direct and safe service braking and parking braking of the output shaft.

Motor Displacement Control: Motors are categorized into single-displacement motors and dual-displacement motors. Single-displacement motors operate with full displacement output. Dual-displacement motors can realize both full-displacement and half-displacement output through control valve regulation, enabling speed control.

Hydraulic transmission, which uses liquid as its working medium, has the advantages of stepless speed change and stable transmission, so it is widely used in grinding machines, honing machines, broaching machines, planers, and other machine tools. Due to its convenient layout and ease of achieving automation, it is also extensively applied in special-purpose machine tools.

Because the output force (or torque) of its actuators is relatively large, control is convenient, and layout is flexible, hydraulic systems can be easily integrated with electrical equipment to achieve automation and remote control. For this reason, hydraulic transmission is widely adopted in numerous control mechanisms of metallurgical equipment, mining equipment, exploration machinery, lifting and conveying machinery, construction machinery, plastic machinery, agricultural machinery, four-column hydraulic presses, forging and casting machines, as well as aircraft and ships.

However, hydraulic transmission is not suitable for long-distance transmission due to its relatively large frictional resistance loss. Therefore, to comprehensively utilize the advantages of both hydraulic transmission and pneumatic transmission, hydro-pneumatic combined transmission is sometimes used for Poclain hydraulic motors. This combination aims to obtain transmission and control devices that are low in cost, durable (for Poclain motors), and stable in operation.