The invention discloses a hydrodynamic
retarder with a front
stator. The
retarder comprises a
retarder shaft, a front bearing, a
stator, a rotor, a
stator end cover, a body, a separation spring, an annular
piston, a meshing gear, a locking sliding framework, a return spring, a synchronous locking ring, a
needle roller bearing, an outer oil seal and the like, wherein a high-pressure oil outlet cavity B is closed by the stator and the stator end cover, a low-pressure oil inlet cavity A is formed by closing the retarder shaft; the stator is arranged in front of the rotor, the rotor is arranged behind the stator, and the stator and the rotor are arranged in a
closed cavity in the body; a sealing ring is arranged between the rotor and the stator and is used for isolating a working cavity C fromthe oil inlet cavity A; when no load exists, a meshing gear is pushed by a separation spring to move rightwards to a right positioning dead point, the meshing gear is separated from the rotor, the rotor does not rotate with the shaft any more, and thereby no-
load loss can be caused even though a small amount of media exist in the working cavity C; an oil duct is arranged in front of the stator, the radial size is reduced, and interference with a transmission shaft is avoided. The retarder is advantaged in that the weight is reduced to the maximum extent,
noise is reduced, strength and reliability are improved, and no-
load loss is reduced.