Constant-velocity joint

A constant velocity joint, and constant velocity joint is a hinge for uniform angular velocity and torque transmission from one shaft to a second shaft angle thereto attached.

Tasks

CV joints are in engineering and used as drive shafts in the automotive industry. Transfer - unlike simple universal joints - the rotation uniform, that is, the angular velocities of the input and output side do not differ from each other. Thus irregularities in the drive train and an additional burden on surrounding components can be avoided. The most widespread are constant velocity joints in vehicle. There are many types, for example in automobiles, when the deflection angle on both sides is equal and the inner plugs and are located in a diffraction plane (Z - W- arrangement ). The following types are listed a selection of the many designs.

Species

Wide joints

Wide joints are typically required for vehicles with front wheel drive. They allow the required deflection for steering axles of the wheels and thereby bending angle up to approximately 50 °.

• A constant velocity universal joint - a special version of the double universal joint
• Tracta Joint - used in 1931 when DKW F1. It consists of forks and sliding spacers.
• Wide-angle ball joint. The staff employed by the U.S. manufacturer Ford engineer Alfred Hans Rzeppa invented in 1928 a constant velocity joint with running in a cage balls. It is characterized by large deflection angle, relatively simple production and good service life. Meanwhile, it is installed in almost all front-wheel drive cars.

Slip joints

At most during compression wheel drives the wheel, the change in length of the drive shaft needs to be compensated. This type of joint is used on the transmission side in front-wheel drive and rear -wheel drive cars in general. They allow angular displacements to about 20 °, and shifts to 30 mm.

• Tripod joint comprises between the inner and outer portions of three cambered rollers.
• Constant velocity joint with the balls in a cage similar to the Rzeppa joint. Patent Offenbach company Löhr and Bromkamp ( LÖBRO - now part of GKN Driveline Germany )

Maintenance

CV joints must be lubricated by a grease pack, which is why they are encapsulated in a rule with a bellows (rubber or TPE material ) against pollution. This is usually carried out in one piece and is placed for mounting on the shaft, so the shaft must be ( the car front wheel for example ) reduced for this purpose by the driven element.