Pin And Bush Couplings

Pin and bush coupling is a mechanical transmission device that connects two halves of the coupling through elastic elements (such as rubber sleeves, nylon column pins), and has both torque transmission and displacement compensation functions. It is mainly divided into the following two categories:

Elastic sleeve column pin coupling (TL/LT type)

1. Structure: The column pin is covered with a rubber sleeve, which absorbs vibration through compression deformation and does not require lubrication.
   

2. Features: Simple structure but limited compensation capability (radial 0.2-0.6mm, angular 0.5 ° -1.5 °), suitable for small and medium power transmission (such as water pumps and fans).

Elastic column pin toothed coupling (ZL type)

1. Structure: Nylon column pins are embedded in tooth shaped grooves, the baffle prevents detachment, and the drum shaped design enhances compensation capability.
   

2. Features: Maintenance free, temperature resistant -20 ℃~80 ℃, can replace some gear couplings, suitable for frequent forward and reverse working conditions.

Core performance advantages

1. Vibration damping and buffering: Elastic components consume vibration energy through deformation, reducing impact loads by more than 30%.
   

2. Displacement compensation: It can adapt to axial, radial, and angular deviations, protecting the alignment error of the shaft system.
   

3. Economy: Low manufacturing cost and convenient maintenance.

Selection principle

1. Load characteristics: ZL type is preferred for impact loads, and TL type should be used with caution in high-frequency start stop scenarios.
   

2. Environmental adaptation: For high temperatures (>80 ℃), heat-resistant nylon column pins should be selected, and stainless steel material is recommended for corrosive environments.

Installation specifications

1. Alignment calibration: The radial deviation should be ≤ 0.1mm, and the angular deviation should be ≤ 0.5 °. Use a laser alignment instrument to improve accuracy.
   

2. Maintenance cycle: Check the wear of elastic components every 6 months.

The pin and bush coupling with its modular design and adaptability, continues to play a key role in industrial transmission and will develop towards high-performance materials and digital monitoring in the future.