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Short description of joint discs / rag joints

In most cases, the joint disk is made of an elastic material, such asas rubber. It sits between the drive shaft and the differential, as well as between drive shaft and gearbox. The disc has metal sleeves, which ensures that the angle differences between the connected shaft are compensated. At the same time, the flexible coupling dampensthe torque shocks which occur at a speed change or the start of the shaft.Sometimes it is necessary to give this part a central extra grip, especially in rapidly rotating or very long shafts.

Rag joint function and responsibility

The rag disc was created by an inventor named Hardy, who registered a patent for it in 1938. This joint disc allows the compensation of axial, radial and angular misalignment, dampens the driveline torque spikes, ensures precise vibrational tuning of the drivetrain and isolates the electrical parts of it. The connection of joint discs is done via joint discs or steel flanges and can be adjusted in their stiffness. The classic use of rag joints is at the transmission output of vehicles with rear-wheel drive or all-wheel drive. Another alternative is to use them between the steering gear and the steering wheel. Well-known manufacturers of joint discs and drive components include LEMFÖRDER, FEBI BILSTEIN, SWAG, VAICO, JAPANPARTS, JURID and BLUEPRINT.

If the rag jointis defective

A worn-out joint disk is a serious issue and a car will not pass its MOT. A defective rag joint manifests itself by jerking while starting the car. At faster speeds you'll hear a loud noise and vibrations. At about 80 km / h metallic clicks can be heard, these are the loose sockets in damaged rubber of the joint disc.If it is completely torn, the disc does not transfer any more power. If you are tech-savvy, you can change a rag joint yourself, but that is only possible with good and proper tools.If in doubt, leave the replacement of this technically important part to a specialist workshop. In our online shop you can find joint discs from European suppliers and order all the necessary parts at cheap prices. You can also find many other parts for cars and for many car makes and models.