Variable velocity universal joint

The cross axle type rigid universal joint is an unequal velocity universal joint widely used in automobiles. The maximum intersection angle between two adjacent shafts is allowed to be 15 ° - 20 °. The cross shaft type universal joint shown in the following figure is composed of a cross shaft, two universal joint yokes and four needle roller bearings. The holes on the two-way joint forks 1 and 3 are respectively sleeved on the two pairs of journals of the cross shaft 2. In this way, when the driving shaft rotates, the driven shaft can not only rotate with it, but also swing in any direction around the center of the cross shaft, so as to meet the needs of simultaneous changes in the included angle and distance. A needle bearing 5 is installed between the cross shaft journal and the universal joint fork hole, and the outer ring of the needle bearing is axially positioned by the snap ring. In order to lubricate the bearing, the cross shaft is generally equipped with an oil nozzle and an oil path leading to the journal. The lubricating oil can be injected into the needle bearing of the cross shaft journal from the oil nozzle.