JPH0329768U

JPH0329768U -

Info

Publication number: JPH0329768U
Application number: JP1989090150U
Authority: JP
Priority date: 1989-07-31
Filing date: 1989-07-31
Publication date: 1991-03-25

Description

[Brief explanation of drawings]

第１図ないし第３図は本考案の一実施例を示す
ものであり、第１図は内燃機関の一部縦断面図、
第２図は非装着状態でのオイルシールの縦断面図
、第３図は装着状態でのオイルシールの縦断面図
、第４図は従来のオイルシールの第３図に対応し
た縦断面図である。２……回転軸としてのクランク軸、２３……オ
イルシール、３５……第１テーパ面、３６……第
２テーパ面、３７……回転方向、３８……第１溝
、３９……第２溝。 1 to 3 show an embodiment of the present invention, and FIG. 1 is a partial vertical sectional view of an internal combustion engine;
Figure 2 is a vertical cross-sectional view of the oil seal in the uninstalled state, Figure 3 is a vertical cross-sectional view of the oil seal in the installed state, and Figure 4 is a vertical cross-sectional view of a conventional oil seal corresponding to Figure 3. be. 2... Crankshaft as a rotating shaft, 23... Oil seal, 35... First tapered surface, 36... Second tapered surface, 37... Rotation direction, 38... First groove, 39... Second groove.

Claims

[Scope of utility model registration request]

The inner surface of the lip portion that is in sliding contact with the outer surface of the rotating shaft includes a first tapered surface that has a tapered shape that becomes larger in diameter as it goes inward in the axial direction of the rotating shaft when the lip is not attached to the rotating shaft, and In the oil seal, the oil seal has a second tapered surface that becomes larger in diameter toward the outside in the axial direction, and has a smaller diameter end connected to the smaller diameter end of the first tapered surface. A plurality of first grooves are provided in the tapered surface at intervals in the circumferential direction and are inclined forward in the rotational direction of the rotational shaft as they go inward in the rotational axis direction.
An oil seal characterized in that the tapered surface is provided with a plurality of second grooves that are inclined forward in the rotational direction as they go inward in the axial direction and are spaced apart in the circumferential direction.