The invention discloses a transmission shaft support unit, belongs to the technical field of bearing production, and mainly solves the problem of damage of the transmission shaft support unit caused by easy release of a support bearing and function loss of a rubber pad in the prior art. The transmission shaft support unit is characterized by comprising a support base, a rubber shock pad, a support bearing and a sealing ring, wherein two snap spring grooves and a large inner snap spring are arranged in an inner hole of the support base;
honeycomb blind hole grooves are formed in two
peripheral end surfaces of the rubber shock pad; two snap spring grooves, a small inner snap spring and a waveform spring are arranged in an inner hole of a
metal ring; the support bearing adopts an inner-outer ring integrated four-
point contact ball bearing; an outer lip of the sealing ring is fixed in the inner hole of the
metal ring; and the inner
diameter of a sealing lip is lightly contacted with and fits the outer
diameter of the inner race of the support bearing. The transmission shaft support unit has the characteristics of improving the axial
bearing capacity of the bearing, reducing the axial
impact load, improving the torque resistance and preventing the release of the support bearing to prolong the service life of the bearing, and is mainly applied to an
automotive transmission shaft support unit.