Housings are mechanisms used in mechanical construction to support and guide, in rotation, transmission shafts.
Depending on the desired use, these housings may be:
- smooth where the shafts resting on the bushings are subjected to sliding friction between the surfaces in contact with one another
- rolling where the contact occurs through balls or rollers contained in cages.
Here rolling friction occurs, allowing for greater charge on the housings and faster rotation speed.