JPH0629538Y2 - Bearing seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a seal member that is mounted between two relatively rotating members and seals the inside and the outside thereof, and more specifically, a bearing that is a bearing portion. To improve the shape of the bearing seal attached to the.

[Prior Art] Conventionally, most bearing seals are made of an elastic body such as synthetic rubber and a reinforcing ring for reinforcing the elastic body, and a sealing lip formed of the elastic body is slidably contacted with a mating member to perform a sealing action. Is done. In recent years, various improvements in performance have been demanded for the bearing seal, and those having a plurality of seal lips and those having side lips protruding in the axial direction have been developed and implemented.

[Problems to be Solved by the Invention] However, although the elastic body used here is formed of a rubber-like material, the rubber-like material retains a large amount of tackiness even after formation and curing, so that it is being stacked or machined. However, the bearing seals with complicated seal lips or axially protruding seal lips have the disadvantage that the stacked laps are joined to each other when they are attached to each other and the workability is significantly reduced. There are serious drawbacks that interfere with each other and induce shape deformation.

In order to solve this drawback, a structure has been developed in which a protrusion is provided on the end surface as seen in JP-B-58-50148, but a structure that merely protrudes to one side does not function more than an anti-adhesion function. Moreover, its shape is also limited, so that it is inferior in general versatility, and the protective action of the seal lip protruding in the axial direction was only desired.

The present invention has been made in view of such drawbacks, and an object thereof is to provide a bearing seal which is free from shape deformation and has excellent workability.

Hereinafter, a detailed description will be given with reference to the drawings.

[Means for Solving the Problems] As shown in FIG. 1, the present invention comprises a reinforcing ring 1 having sufficient rigidity such as metal and an elastic body such as synthetic rubber or synthetic resin, and projects in the axial direction. A bearing seal (A) having a seal lip (2), wherein a projection ring (3) having a projection size (a) projecting axially on the back side of the bearing seal (A) and a projection size (b) projecting axially on the regular side surface of the bearing seal (A) is provided. The end surface of the protruding ring 3 is formed to have the same diameter portion so that the protruding dimension a + b of the protruding ring 3 is larger than the axial dimension c of the overhanging seal lip 2.

Further, as shown in FIG. 3, a projecting ring 3 having a projecting dimension a projecting axially on the back side surface and a projecting dimension b projecting axially on the regular side surface is provided, and the end rings of the projecting rings 3 on both sides have the same diameter. A bearing seal A having a portion with a protrusion dimension a + b of the protrusion ring 3 and a dimension greater than or equal to the axial dimension c of the overhanging seal lip 2 is formed, and the bearing seal A has a substantially L-shaped slinger 4. It is also possible to combine the above and to make the seal lip 2 slidably contact the inner peripheral surface thereof.

[Operation] The present invention having the above structure has the following excellent operation.

That is, when the bearing seals A of the present invention are stacked as shown in FIG. 2, since the projecting rings 3 on the front and back sides have end portions having the same diameter portion, the projecting rings 3 come into contact with each other, and the seal lips projecting axially here. Since the projecting dimension c of 2 is smaller than the total dimension a + b projecting to the spine / regular side surface of the projecting ring 3, the projecting ring 3 is wrapped inside and is kept in an unloaded state, avoiding contact with the body of the bearing seal A. Get burned.

Further, in the anti-adhesion structure, as described above, since only a part of the protruding ring 3 is in contact therewith, a small ground contact area can be maintained, so that the adhesive action due to the close contact is not achieved and a good separation is achieved. Close.

Next, as shown in FIG. 3, in the case of combining the substantially L-shaped slinger 4 with the bearing seal A having the protruding ring 3 on the back / regular side surface and the protruding seal lip 2,
After assembling the two members A and 4 in advance, the outer surface of the slinger 4 is pressed and fitted. In this structure, first, the peripheral portion of the bearing seal A comes into contact with the outer ring end surface of the bearing and refuses to press-fit it, but here the seal lip 2 protruding in the axial direction and the rigid protruding ring 3 (projecting size) protruding to the regular side surface are provided. (Part b) comes into contact with the inner surface of the slinger 4, and when this is further pressed in, the entire bearing seal A is pushed and moved to the fitting portion, so that the bearing seal A can be mounted at an appropriate position.

[Embodiment] In carrying out the present invention, the protruding dimension a or b of the protruding ring 3 may be overhanging on either the front or back side, and it does not particularly matter. However, when the slinger 3 is combined, the sealing lip protruding in the axial direction is used. It is preferable to have a large number of parts on the second side, that is, on the regular side surface, because the press-fitting operation can be reliably performed.

Further, the slinger 4 may be shaped so as not to contact the protruding ring 3 as shown in FIG. 4, and in this structure, a fitting method in which the protruding ring 3 and the slinger 4 are simultaneously pushed is a preferable method.

Further, in the description of the present invention and the drawings, the seal lip 2 protruding in the axial direction is used, but the seal lip extending in the radial direction may be used in any direction.

[Advantages of the Invention] According to the present invention, the bearing seal A, which is superposed during stacking or mounting on a mechanical device, is placed in a free state without the seal lip 2 contacting other members, and has a performance that can be held immediately after mounting. It can be demonstrated. In addition, because of the small contact area at the time of stacking, the anti-adhesion effect is great.

Further, the bearing seal A, which is press-fitted and mounted in combination with the slinger 4, self-slides into the fitting groove of the bearing immediately before mounting and is separated from the protruding ring 3 to form a small gap with the slinger 4, so that the small gap The part is useful because it can be expected to have a labyrinth seal action.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the bearing seal of the present invention. FIG. 2 is a partial sectional view showing a state where the bearing seals of FIG. 1 are stacked. FIGS. 3 and 4 are partial cross-sectional views of another embodiment of the present invention while being mounted on a bearing. A …… Bearing seal, a ・ b …… Projection size, c ……
Axial dimension of seal lip, 1 ... Reinforcement ring, 2 ... Seal lip, 3 ... Projection ring, 4 ... Slinger

Claims (2)

[Scope of utility model registration request] 1. A reinforcing ring 1 and an elastic body such as synthetic rubber,
In a bearing seal A having a seal lip 2 that projects in the axial direction; a protruding ring 3 having a protruding dimension a projecting axially on the back side surface of the bearing seal A and a protruding dimension b projecting axially on the regular side surface. The end faces of the projecting rings 3 on both sides are formed to have the same diameter portion so that the projecting size a + b of the projecting ring 3 is greater than the axial size c of the projecting seal lip 2. Bearing seal. 2. A projecting ring 3 having a projecting dimension a projecting in the axial direction on the back side surface and a projecting dimension b projecting in the axial direction on the regular side surface is provided, and end portions of the projecting rings 3 on both sides have the same diameter portion. A bearing seal A having a dimension greater than or equal to the axial dimension c of the protruding seal lip 2 is formed by the protrusion dimension a + b of the protrusion ring 3, and the bearing seal A is combined with a slinger 4 having a substantially L shape. A bearing seal characterized in that the seal lip 2 is brought into sliding contact with the inner peripheral surface.