Telescopic universal joint

The utility model relates to a transmission field provides a telescopic universal joint, including the initiative universal joint, driven universal joint, pass the power cover and pass the mechanical axis, it is connected with the initiative universal joint to pass power cover one end, and the other end is an open end, the one end that passes the mechanical axis is connected with driven universal joint, the other end stretches into the inside that passes the power cover, it is provided with moment of torsion transfer device to pass the mechanical axis and pass between the power cover, moment of torsion transfer device includes pivot and bearing, pivot one end is with biography mechanical axis fixed connection and follow the radial setting that passes the mechanical axis, the other end and bearing interference fit, the inner wall that passes the power cover is provided with axial rectangular channel, the bearing is installed in the rectangular channel. When the axial displacement compensation that realizes the