Product Features of HCM Hydraulic Motor

The HCM hydraulic motor is a new-type product independently developed by our company with design improvements based on Italian technology, integrating years of practical experience. Its main features are as follows:

There is no lateral force between the piston and the swing cylinder; the bottom of the piston is designed with hydrostatic balance; and torque is transmitted between the piston and the crankshaft via rolling bearings. All these design elements reduce friction losses during power transmission. Therefore, the HCM series hydraulic motor features high mechanical efficiency and a high starting torque (with a mechanical efficiency of over 0.92 during startup).

The flat port plate is simple and reliable, which enhances sealing performance—resulting in excellent low-speed stability and minimal leakage. A plastic piston ring is used to seal the gap between the piston and the swing cylinder, achieving zero leakage. Thus, the motor boasts high volumetric efficiency (up to 0.98).

The structural design reduces friction losses and improves sealing performance, ensuring excellent low-speed stability. The motor can operate stably at a working condition of 1 r/min and has a wide speed regulation range (with a speed adjustment ratio of up to 1000).

The piston and bearing sleeve are tightly attached via a snap ring with no clearance. As a result, this series of hydraulic motors can operate under pump working conditions; when the oil inlet is closed, the motor can run at high speed under free-wheel working conditions.

The HCM series hydraulic motor supports high operating pressure, with a maximum pressure of up to 45 MPa. It also features light weight, compact size, and high power density.

Owing to its simple structure, reasonable design, and adoption of bearings with high load-carrying capacity, the motor ensures reliable operation, long service life, and low noise. Its drive shaft can withstand radial loads, and the rotation direction is reversible.

hcm_00.pdf

Precautions for Installing Bolts and Nuts

(1) The contact surfaces of bolts, nuts, and components shall be smooth and flat; otherwise, the bolts may easily loosen or bend after installation (applicable to swing-cylinder hydraulic motors).(2) When tightening the combined bolts and nuts on the same plane, you must follow the specified sequence and tighten them gradually in a staggered manner. Failure to do so will cause uneven stress on the components and bolts, or even deformation.(3) Dirt and debris on the threads (related to hydraulic motor performance) must be cleaned thoroughly; otherwise, the tightening torque will be affected or the threads may be damaged.(4) The tightening torque of bolts and nuts must comply with the specifications. Excessive torque will stretch or even break the bolts, or cause mechanical rupture during operation; insufficient torque will result in low friction torque of the thread pair, easily leading to loosening, which fails to ensure the stability and accuracy of the machinery during operation.

All high-speed parts shall be adjusted in accordance with the specifications. After installation, a comprehensive and careful inspection shall be conducted on the position, tightness, and adjustment of all components to confirm they are correct and in place. This is to prevent component damage and faults caused by incorrect installation.