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A universal joint (also called a universal coupling or U-joint) is a joint or coupling connecting rigid shafts whose axes are inclined to each other. It is commonly used in shafts that transmit rotary motion .
Repeated joints may be summarized by their number; so that joint notation for the SCARA robot can also be written 2RP for example. Joint notation for the parallel Gough-Stewart mechanism is 6-UPS or 6(UPS) indicating that it is composed of six identical serial limbs, each one composed of a universal U, active prismatic P and spherical S joint.
Also, although universal joints are simple to produce and can withstand large forces, universal joints often become "notchy" and difficult to rotate as the angle of operation increases. The first type of constant-velocity joint was the Double Hooke's (Double Cardan) Joint which was invented by Robert Hooke in the 17th century. This design uses ...
the cylindric joint consists of an RP or PR serial chain constructed so that the axes of the revolute and prismatic joints are parallel, the universal joint consists of an RR serial chain constructed such that the axes of the revolute joints intersect at a 90° angle;
Hardy Spicer is a brand of automotive transmission or driveline equipment best known for its mechanical constant velocity universal joint originally manufactured in Britain by Hardy employing patents belonging to US-based Spicer Manufacturing. Hardy and Spicer soon became partners. Later Spicer became Dana Holding Corporation.
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