Drive shaft support structure for use in industrial vehicle

Abstract

The invention provides a rotating shaft supporting structure in an industrial vehicle which comprises a shaft case wiht shaft hole, a rotating shaft supported to the shaft case through rolling bearings, a seal member mounted to the shaft case on the outside of the rolling bearings, and the seal cover mounted to the rotating shaft on the outside of the seal member. The seal cover has a mounting part mounted to the rotating shaft, an inclined part extended to the seal member side from the mounting part side, and a curved edge part extended from the inclined part. The inclined part has a shaft side inclined surface inclined by diameter enlargement, and the curved edge part has a convex surface enlarged in diameter continuously with the shaft side inclined surface. The seal member has the lip part brought into sliding contact with the shaft side inclined surface.

Description

technical field [0001] The present invention relates to a rotary shaft support structure of an industrial vehicle, and more particularly, to a rotary shaft support structure of an industrial vehicle having a seal cover for protecting a sealing member. Background technique [0002] FIG. 7 shows a known rotary shaft support structure 70 of an industrial vehicle, which includes a shaft housing 71 , a rotary shaft 74 and an annular sealing member 76 . The shaft housing 71 has a shaft hole 72 and a roller bearing 73 installed in the shaft hole 72 . The rotary shaft 74 is supported by the shaft housing 71 via a roller bearing 73 , and protrudes toward the outside of the shaft housing 71 at one end thereof. The seal member 76 is located on the outer side of the roller bearing 73 and is installed inside the shaft housing 71 so as to be in sliding contact with the peripheral surface of the rotary shaft 74 . The flange 75 radially extends from the end of the rotary shaft 74 protrudi...

AI Technical Summary

Problems solved by technology

[0007] But in the prior art shown in Figs. 7 and 8, they do not prevent the elongated foreign matter from wrapping around the protruding lip of the sealing cap and prevent dust from entering due to the sliding contact between the protruding lip and the sealing cap at the same time, while Regardless of the axial error of the rotating shaft

In other words, the prior art shown in FIG. 7 prevents entry of dust only by the contact of the protruding lip of the sealing member with the rotating shaft, but elongated foreign matter is easily wound around the protruding lip.

The prior art shown in Fig. 8 prevents the slender foreign matter from winding through the sealing cover that protects the protruding lip, but the sealing cover is not in sliding contact with the protruding lip, so it cannot prevent dust from entering

On the other hand, publication No. 9-292032 does not describe the protruding lip, which can cause problems when it is too much affected by the axial error of the rotating shaft, and does not disclose how to prevent the winding of the elongated foreign matter, and how to Use a sealing member with a protruding lip of the type here to prevent the ingress of dust

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