Bushes in the bushed pin type of flexible coupling are typically made of rubber.

Explanation:

The bushed pin type of flexible coupling is a type of mechanical device used to connect two shafts together in order to transmit torque while allowing for angular misalignment and axial movement. It consists of two hubs or flanges, connected by a pin or bolt, with bushes or sleeves inserted between the pin and the flanges.

The purpose of the bushes in the flexible coupling is to provide a flexible connection between the two shafts, allowing for misalignment and movement while transmitting torque. The material used for the bushes needs to be able to withstand the forces and stresses experienced during operation, as well as provide the necessary flexibility.

Rubber is commonly used as the material for the bushes in flexible couplings due to its unique properties. Some of the reasons why rubber is chosen for this application include:

1. Flexibility: Rubber is a highly flexible material, allowing it to absorb and dampen vibrations and shocks. This flexibility helps to reduce wear and tear on the coupling and other connected components.

2. Damping properties: Rubber has excellent damping properties, meaning it can effectively absorb and dissipate energy. This helps to reduce noise and vibrations, improving the overall performance and lifespan of the coupling.

3. Resilience: Rubber is known for its resilience, or its ability to return to its original shape after being deformed. This property allows the rubber bushes to withstand repeated movements and misalignments without permanent damage.

4. Chemical resistance: Rubber is resistant to a wide range of chemicals, oils, and solvents, making it suitable for various industrial applications where exposure to these substances is common.

Overall, the use of rubber bushes in the bushed pin type of flexible coupling helps to provide a reliable and flexible connection between shafts, allowing for efficient torque transmission while accommodating misalignment and movement.