Radial Piston Motor

Radial piston hydraulic motor working principle

When the pressure oil enters the bottom of the plunger in the cylinder through the window of the fixed oil distribution shaft 4, the plunger protrudes outward and tightly supports the inner wall of the stator, because there is an eccentric distance between the stator and the cylinder. At the contact between the plunger and the stator, the reaction force of the stator to the plunger is . The force can be decomposed into two components and . When the oil pressure acting on the bottom of the plunger is p, the diameter of the plunger is d, and the angle between the force and the force is X, the force produces a torque on the cylinder body, causing the cylinder body to rotate. The cylinder body then outputs torque and rotational speed through the transmission shaft connected at the end face.

Classification of hydraulic motors

• According to the structural form, it is divided into several main forms: gear type, vane type and plunger type.
• According to the speed and torque range: high-speed motor and low-speed motor.
• Gear-type hydraulic motor: simple in structure and cheap in price, it is often used in occasions with high speed, low torque and low requirements for motion stability. Such as driving grinders, fans, etc.
  
  

Vane hydraulic motor: small moment of inertia, sensitive action, low volumetric efficiency, soft mechanical characteristics, suitable for occasions above medium speed, small torque, requiring frequent starting and reversing.

Axial plunger motor: high volumetric efficiency, large adjustment range, good low-speed stability, poor impact resistance, often used in high-pressure systems with high requirements.