Basic forms: gear type, vane type, axial piston type

Main features: high speed, small moment of inertia, easy starting and braking, high adjustment sensitivity, low output torque

Basic form: radial plunger type

Main features: large displacement, large volume, low speed, large output torque

Advantages: small size, small moment of inertia, sensitive action, suitable for high commutation frequency

Disadvantages: Large leakage, poor low-speed stability, often used in high-speed and low-torque applications

Working pressure: the actual pressure of the oil input into the motor, the size is determined by the motor load

Motor pressure difference: the difference between input pressure and outlet pressure

Rated pressure: the highest pressure for the motor to operate continuously and normally. If it exceeds this value, it is overloaded.

Displacement: The volume of oil required for one revolution of the motor output shaft when there is no internal or external leakage.

Theoretical flow rate: The flow rate of oil input when the motor reaches the required speed when there is no leakage.

Actual flow: Enter the actual flow of the motor

Volumetric efficiency

Rotating speed

Torque

Mechanical efficiency

total efficiency

Double rod piston cylinder

Single rod piston cylinder

Differential hydraulic cylinder

The plunger hydraulic cylinder is single-acting, and its return stroke needs to be completed with the help of its own weight or other external forces such as springs.

If you want to obtain two-way motion, two-piston hydraulic cylinders can be used in pairs. In order to reduce the weight of the plunger, a hollow plunger is sometimes made.

single blade type

Double blade type

Compact structure, large output torque, but difficult to seal, generally only suitable for medium and low pressure systems

Type

Used in certain hydraulic systems that require high-pressure liquid for a short period of time or locally.

Pressure ratio: represents the pressurization capacity

It is composed of two or more piston hydraulic cylinders. The piston of the previous stage piston cylinder is the cylinder barrel of the subsequent stage piston steel.

Features: The extended stroke of the piston rod is long, and the structural size after contraction is small.

Connection between cylinder barrel and cylinder head

Piston and piston rod connection

Sealing device: To prevent oil leakage, dynamic seals at the piston and piston rod and static seals at the cylinder head

Buffer device: seals part of the oil at the end of the stroke, forcing it to squeeze out from small holes or slits, generating oil return resistance, braking the working parts, gradually slowing down the movement speed, and preventing the piston and cylinder head from colliding with each other.

Exhaust device: For hydraulic cylinders with high speed stability requirements, special exhaust devices, such as exhaust plugs and exhaust valves, are often installed at the highest point of the hydraulic cylinder.