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.

To better meet the requirements of forward and reverse rotation, the gear motor has the following structural characteristics: its oil inlet and outlet ports are identical and symmetrical, and it is equipped with an independent drain port to lead the leakage oil from the bearing part out of the housing. To reduce the starting friction torque, roller bearings are adopted. For planetary hydraulic motors, the number of teeth of the gear hydraulic motor is more than that of the pump to reduce torque ripple.

Due to poor sealing performance, the gear hydraulic motor has relatively low volumetric efficiency. The input oil pressure cannot be too high, so it cannot generate large torque. Moreover, the instantaneous rotational speed and torque change with the position of the meshing point. Therefore, the planetary motor gear hydraulic motor is only suitable for high-speed and low-torque occasions. It is generally used in construction machinery, agricultural machinery, and industrial equipment that do not have high requirements for torque uniformity.