Patent ID: 9562608
Date: 2017-02-07
CPC Classifications: B60B,B60K,F16C,F16J

Claim:
1. A rotary shaft seal structure for a drive system of a vehicle, the rotary shaft seal structure comprising: a case having a shaft hole at an end of the case; a rotary shaft supported by the case, the rotary shaft extending into outside air outside the case via the shaft hole; and a seal mechanism interposed between the shaft hole and the rotary shaft, wherein the case includes a canopy portion and a recessed portion, the canopy portion extends in an axial direction of the rotary shaft so as to surround the rotary shaft, and the recessed portion is recessed coaxially with the canopy portion from an end face of the canopy portion in the axial direction, and the seal mechanism includes a deflector and a seal member, the deflector includes an expanded portion and a penetration portion, the expanded portion is fixed to the rotary shaft in a liquid-tight manner and expands radially outward, the penetration portion bends from the expanded portion in the axial direction and extends into the recessed portion, the seal member is an elastic body, and includes a rotary shaft sliding contact portion and an extended portion, the rotary shaft sliding contact portion is fixed in the shaft hole in a liquid-tight manner on a case side with respect to the deflector between the case and the rotary shaft, and is in sliding contact in a liquid-tight manner with the rotary shaft, the extended portion extends in the axial direction and is in sliding contact in a liquid-tight manner with the expanded portion, wherein the canopy portion has a cutout at its lower portion, and wherein the rotary shaft is a rear wheel-side drive axle, and the canopy portion has the cutout at its vehicle rear-side portion.