Ball-cage type universal joint

The utility model relates to a ball-cage type universal joint. The ball-cage type universal joint is characterized by comprising an inner joint and an outer joint. The outer surface of the inner joint is spherical. Steel ball grooves are uniformly distributed on the spherical surface in a circular way. The inner diameter of the outer joint is provided with steel ball chutes. The inner joint outer surface is sleeved inside the steel ball chutes on the inner diameter of the outer joint in a matching way after being provided with steel balls. By performing transmission between the inner joint and the outer joint through the steel balls simultaneously located inside the steel ball grooves and the steel ball chutes, the ball-cage type universal joint can satisfy requirements of telescoping and bending in any angle while the inner joint and the outer joint are rotating in a synchronous way. The ball-cage type universal joint has the advantages of simple structure, stable reliable transmission and long service lifet