Sleeve and cotter joint is a type of joint used to typically connect two similar coaxial cylindrical rods. It contains a sleeve and two wedge shaped tapered cotters. Appropriate slots are cut in the sleeve and in the cylindrical rods. The cotters are assembled into these slots.
The following sections explain the sleeve and cotter joint in detail:
As stated in the introduction above, a typical sleeve and cotter joint contains the following parts:
- A Sleeve
- Two wedge shaped tapered cotters
The exploded view shown below will help you to visualize the parts of a sleeve and cotter joint:
In the above exploded view you can find the cut slots (sockets) in the sleeve and in the cylindrical rods.
Two cylindrical rods, which are to be joined, are aligned coaxially. Their similar ends are made to touch each other and their slots are made symmetrical with respect to each other (preferably pointing upwards). Sleeve is then placed over them. Its slots are aligned with the slots of the cylindrical rods. Two cotters are inserted into the aligned slots. An assembled view found below will help you understand this assembly process.
In a sleeve and cotter joint, the cut slots are always made a little bit wider than the width of the cotters in order to promote wedging action of the cotters over the slots. This clearance is called cotter clearance.
- This joint is the simplest cotter joint in existence.
- It is quite rigid and can take both tensile and compressive loads.
- It can be easily assembled and dismantled.
- The joint can also be used to connect similar pipes, tubes
- Rectangular rods and dissimilar cylindrical rods cannot be connected using this joint.
- Unlike the universal joint, a sleeve and cotter joint does not allow angular misalignment between its cylindrical members.
- It cannot connect cylindrical members which undergo rotation.