Pin Bush Couplings

Pin bush coupling is a flexible coupling that achieves power transmission through the combination of elastic bushing and pin shaft. Its typical structure includes:

1. Metal wheel hub: usually made of aluminum alloy or steel flange, connected to the driving/driven shaft at both ends through keyway or taper sleeve.
   

2. Elastic lining: mostly made of polyurethane or rubber material, embedded with metal lining to enhance wear resistance, absorb vibration and compensate for axial/radial deviation.
   

3. Pin shaft component: a cylindrical pin made of stainless steel or alloy steel that runs through the bushing and wheel hub, allowing for slight deformation when transmitting torque.

Working principle: When the active shaft rotates, the torque is compressed by the pin shaft to produce deformation of the elastic bushing, thereby buffering the impact load and compensating for installation deviation.

Elastic bushings can convert 30% -50% of torsional vibration energy into thermal energy, making them particularly suitable for scenarios such as motor pump units that are prone to harmonic vibration.

Deviation compensation characteristics

1. Axial deviation: ± 1.5mm
   

2. Radial deviation: ± 0.8mm
   

3. Angular deviation: ± 1.5 °

Polyurethane lining is resistant to oil stains and aging, with a working temperature range of -30 ℃ to+80 ℃ (short-term peak 120 ℃), no need for lubrication, and a lifespan of up to 50000 hours.

Application scenarios

1. Construction machinery: excavator slewing mechanism, loader transmission shaft, using the anti impact characteristics of lining to protect hydraulic motors.
   

2. Automation equipment: The joint connection of the robotic arm and the flexibility of the bushing can reduce the positioning error of the servo motor.
   

3. Energy equipment: The yaw system of the wind turbine, with multiple sets of bushings connected in series, can withstand megawatt level dynamic loads.

The pin bush coupling with its characteristics of "rigid transmission and flexible buffering", is gradually replacing traditional gear couplings and becoming the preferred solution for modern industrial transmission.