BREATHER STRUCTURE OF IN-WHEEL MOTOR DRIVE UNIT

摘要

PROBLEM TO BE SOLVED: To provide an improved breather structure which can surely prevent that oil in an in-wheel motor drive unit is ejected from a breather.;SOLUTION: A breather structure 71 comprises: a first internal pressure release hole 72 which penetrates a speed reduction part casing 22b, and releases the internal pressure of the speed reduction part to the outside; a catch tank 73 which is arranged outside the speed reduction part, and connected to an outlet 72b of the first internal pressure release hole; a reflux passage 74 in which an inlet 74a is connected to a bottom of the catch tank, and the outlet 74b is connected to the reduction part side; a oneway valve 76 which is arranged at the reflux passage, permits a flow to the outlet from the inlet, and blocks a reverse flow; and a second internal pressure release hole 75 which is formed at an upper part rather than the bottom of the catch tank, and releases the internal pressure of the catch tank to the outside.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2016,JPO&INPIT