JPH0213811Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil seal, and more particularly, to an oil seal having a compact structure and requiring a small space for installation.

In a normal oil seal, the main lip seals against internal lubricant leakage, and the auxiliary lip prevents external dust from entering, which are arranged as one body, resulting in axial and radial dimensions. However, in cases where the space for installation is limited, sealing performance may have to be sacrificed.

In the present invention, a first sealing lip made of a rubber-like elastic material is integrally connected to an end of a first radial part extending radially from one end of the first cylindrical part. and a rubber-like elastic material extending radially from one end of the second cylindrical portion facing the first radial portion and extending radially from one end of the second radial portion facing the first radial portion. A second seal member is formed by integrally joining a plurality of pieces of second seal lips arranged in parallel in the axial direction. The second seal lip is bent so as to extend toward the second cylindrical portion, and comes into elastic contact with the circumferential surface of the second cylindrical portion.
bent so as to extend toward the end side of the cylindrical portion, and combined so as to come into elastic contact with the circumferential surface of the first cylindrical portion;
One sealing member is fitted and fixed to one of the two members making relative rotational movement, and the other sealing member is fitted and fixed to the other of the two members making relative rotational movement, so that the occupied space is suppressed to a minimum. , to maintain good sealing performance.

Additionally, annular grooves are provided on one side of each of the plurality of second seal lips arranged in parallel in the axial direction at different positions in the radial direction, thereby preventing interference between the seal lips. .

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment shown in FIG. 1, at the radially inner end of the first ring, which has a first cylindrical portion 1 and a first radial portion 2 and has an approximately inverted L-shaped cross-sectional shape, A first sealing member 5 made of a rubber-like elastic material and integrally baked with a first sealing lip 3 having a substantially frustoconical shape, a second cylindrical portion 6, and a second radial direction. At the outer end of the second ring, which has a generally L-shaped cross-sectional shape and has a section 7, the second ring is made of a rubber-like elastic material, extends radially outwardly, and is axially juxtaposed. The second sealing member 10 is formed by integrally baking two pieces of the second sealing lip 9, and the first sealing lip 3 is bent toward the end of the second cylindrical portion 6 to form the second cylindrical portion 6. The second seal lip 9 is bent toward the end of the first cylindrical portion 1 and elastically contacts the circumferential surface of the first cylindrical portion 1, thereby forming an oil seal. , the first cylindrical part 1 is placed on the outer side of the two members that are arranged concentrically with each other and makes relative rotational movement, and the second cylindrical part 6 is placed on the inner side of the two members that make relative rotational movement. The first seal lip 3 performs a sealing action against the lubricant on the right side of the figure, and the second seal lip 9 seals dust etc. in the atmosphere on the left side of the figure. The lubricant is configured to prevent intrusion into the lubricant side.

The second seal lip 9, which has two pieces arranged in parallel, has annular grooves 13 formed on one side surface at different positions in the radial direction, so that the second seal lip 9 comes into contact with the circumferential surface of the first cylindrical portion 1. This prevents them from interfering with each other when bending and deforming. That is, when the two pieces of second seal lip 9 that are not provided with the annular groove 13 or that are provided at the same position in the radial direction are bent and deformed due to contact with the mating peripheral surface, as shown in FIG. Since the radial positions of the deformed parts are approximately the same, they cause mutual interference and hinder the maintenance of normal sealing performance, but as shown in Fig. 1, the first radial part 2 side second seal lip 9
As shown in FIG. Compared to the position of the bending deformation part of the second seal lip 9, the bending deformation position of the second seal lip 9 on the first radial part 1 side is located radially outward. Seal lip 9
However, the second seal lip 9 on the first radial portion 1 side
It now shows an attitude tilted more towards the atmosphere than before.
As a result, mutual interference between the two seal lips 9, 9 is avoided, and sealing performance is maintained at a high level.

As described above, the oil seal of the present invention includes a first seal member having a seal lip made of a rubber-like elastic material coupled to an end of a radial portion of a first ring having a substantially inverted L-shaped cross section; a second seal member, each of which has a plurality of rubber-like elastic material seal lips arranged in parallel in the axial direction, coupled to the end of the radial portion of the second ring having a substantially L-shaped cross section; The sealing lip of the cylindrical part is pressed toward the end of the other cylindrical part and combined so as to come into elastic contact with the circumferential surface of the other cylindrical part, so that the structure is compact and the space occupied is suppressed to a minimum. Moreover, the functions of preventing internal lubricant leakage and preventing external dust from entering are both maintained well. In addition, since annular grooves were provided at different radial positions on one side of the plurality of second seal lips arranged in parallel in the axial direction, the positions of bending deformation of each seal lip were shifted in the radial direction, so that the seal lips were mutually aligned. Therefore, it is possible to obtain a compact structure while maintaining the necessary sealing performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the structure of an oil seal according to the present invention, and FIGS. 2 and 3 are partial sectional views showing bending deformation of parallel seal lips. 1... First cylindrical part, 2... First radial part,
3...First seal lip, 5...First sealing member, 6...Second cylindrical part, 7...Second radial part, 9...Second seal lip, 10...Second sealing member Seal member, 13... annular groove.

Claims (1)

[Scope of utility model registration request] A first sealing member comprising a first sealing lip 3 made of a rubber-like elastic material integrally coupled to an end of a first radial portion 2 extending in the radial direction from the first cylindrical portion 1. 5, and a rubber-like member is provided at the end of a second radial portion 7 extending radially from a second cylindrical portion 6 facing the first radial portion 2 and facing the first cylindrical portion 1. A second sealing member 10 is made of an elastic material and is integrally connected with a plurality of pieces of second sealing lips 9 arranged in parallel in the axial direction. Cylindrical part 6
The second sealing lip 9 is bent to extend toward the end of the second cylindrical portion 6 and comes into elastic contact with the circumferential surface of the second cylindrical portion 6.
The second sealing lip 9 is bent so as to extend toward the end thereof, and is assembled so as to come into elastic contact with the circumferential surface of the first cylindrical portion 1. Annular grooves 1 at different positions, respectively.
Oil seal with 3.