Editing Constant-velocity joint (section)

=== CV boots and lubrication ===
A separate flexible cover is usually installed over the CV joint, to protect it from foreign particles and prevent the lubricating grease from leaking out.<ref>{{cite web |title=CV Joint: how it works, symptoms, problems |url=https://www.samarins.com/glossary/cv_joint.html |website=www.samarins.com |access-date=14 February 2023}}</ref> This cover is usually made of rubber and called a "CV boot" or "CV gaiter". Cracks and splits in the boot will allow contaminants in, which would cause the joint to wear quickly or completely fail. An all-metal [[universal joint]] or CV located inside and protect by a [[Beam axle|solid axle]] (housing), swivel hub or closed knuckle may be desirable in harsh operating environments, where rubber is prone to physical or chemical damage. Metal armour and [[kevlar]] sleeves/covers may be used to protect rubber CV boots.

The CV joint is usually lubricated by [[molybdenum disulfide]] grease. The six spheres are bounded by an anti-fall gate that prevents the spheres from falling when the shaftings are perfectly aligned.