JPH088345Y2 - Bearing seal structure - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an improvement in a seal structure of a bearing used for a hub unit bearing or the like.

[Prior art]

Conventional bearing seals are shown in Figs. 4 and 5
-117626), FIG. 6 (Actual No. 60-64101)
And FIG. 7 (Japanese Utility Model Laid-Open No. 57-46128). In any of the above-mentioned seals, the core metal 1 of each seal is bent in an L shape in order to improve its rigidity. Then, the rubber material is vulcanized at the tip of the bent portion 1a on the bent side of each core metal 1 to form the lip 2.

[Problems to be solved by the device]

As described above, in each of the above seals, the lip 2 is formed at the tip of the bent portion 1a of the core metal 1. Therefore, in FIG. 4 (b) and FIGS. When the core metal 1 is attached to the outer ring portion 3 and the lip 2 is slidably contacted with the inner ring portion 4, the outer ring portion 3 is used.
Between the inner ring portion 4 and the inner ring portion 4, not only the height of the lip 2 but also the length of the bent portion 1a of the core metal 1 is added. That is, when the seal having the above-described structure is mounted, there is a problem that the seal cannot be mounted on a thin portion in the radial direction of the bearing. Therefore, if a seal is formed without bending the core metal 1 so that the core metal 1 can be attached to a thin portion in the radial direction, sufficient rigidity cannot be obtained (particularly, it is weak against a load in the radial direction).
Therefore, the seal is distorted by the load at the time of press fitting. Further, when the above-mentioned seals are mounted in the state as shown in FIG. 4 (b), when the seals are press-fitted between the outer ring portion 3 and the inner ring portion 4, the seal core is inserted. The thin tip portion 1b of the non-folded side of the gold 1 must be pressed, and the clearance of the press-fitting jig cannot be large. Therefore, there is also a problem that press-fitting defects occur during mass production. Therefore, an object of the present invention is to provide a structure of a sealed bearing that can be mounted on a portion of the bearing that is thin in the radial direction and can eliminate defective press-fitting.

[Means for Solving the Problems]

In order to achieve the above object, the seal structure of the bearing of the present invention is L-shaped and has a base portion extending in the axial direction and a bent portion extending in the radial direction and connected to one end of the base portion. A cored bar having a V-shaped cross section and attached to either the outer ring or the inner ring of the bearing, and an elastic body, and formed at the tip of the base of the cored bar of the inner ring or the outer ring of the bearing. It is characterized in that it is provided with a lip that is in sliding contact with the other peripheral surface.

[Action]

A cored bar is attached to either the outer ring or the inner ring of the bearing, while a lip formed of an elastic body at the tip of the cored bar makes sliding contact with the other of the outer ring or the inner ring of the bearing. Thus, the seal mounted inside the bearing prevents dust and the like from entering the inside of the bearing from the outside and impairing the function of the bearing. At that time, since the lip of the seal is formed at the tip of the base portion of the core metal extending in the axial direction, the lip is formed at the tip of the bent portion extending in the radial direction of the core metal. Also, the radial thickness of the seal is thin.

【Example】

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is a sectional view of the seal of this invention. In FIG. 1, a core metal 11 of a seal has a ring shape and includes a base portion 11a extending in an axial direction and a bent portion 11b extending in a radial direction.
And is bent so as to have an L-shaped cross-sectional shape. In this way, sufficient rigidity is obtained to withstand the load (especially the load in the radial direction) during press fitting. Then, the rubber material 12 is formed so as to cover the inner surface of the base 11a along the inner surface from the curved portion 11c of the cored bar 11 to the unbent base portion 11a. And rubber material
The tip end of 12 is made to project from the tip of the base 11a of the cored bar 11, and the lip 13 is integrally formed at the tip of the rubber material 12. At that time, as described above, by forming the rubber material 12 so as to cover the inner surface of the base portion 11a, the adhesion of the rubber material 12 to the core metal 11 is strengthened, and the core material 11 of the rubber material 12 is removed. It prevents peeling. As shown in FIG. 2, the seal 10 having the above-described structure includes an outer ring 15 and an inner ring 16 in a bearing such as a hub unit bearing.
It is installed between and. In that case, the seal 10 is press-fitted into the inner ring 16 by pushing the bent portion 11b of the core metal 11 of the seal 10 with a jig. Therefore, the area of the push-in portion when the seal 10 is press-fitted can be made wider than in the case where the tip of the base 11a of the cored bar 11 is pushed in as in the conventional case. By doing so, the clearance of the jig used when press-fitting the seal 10 can be made large, so that press-fitting defects can be reduced. FIG. 3 is a diagram showing a state in which a seal is mounted between the outer ring 15 and the inner ring 16 of the bearing as described above, in comparison with the conventional example. FIG. 3 (a) shows the mounted state in this embodiment, and FIG. 3 (b) shows the mounted state in the conventional example shown in FIG. It will be apparent from a comparison of FIGS. 3 (a) and 3 (b), but in the seal 10 of this embodiment, the lip 13 is formed at the tip of the base 11a of the core metal 11, The distance A between the outer ring 15 and the inner ring 16 is the distance between the outer ring 15 'and the inner ring 16' when the lip 2 is formed at the tip of the bent portion 1a of the core metal 1 as in the case of the conventional seal 5. It can be made sufficiently smaller than B. That is, according to the bearing seal structure of the present embodiment, L
By forming the lip 13 at the tip of the base 11a of the cored bar 11 bent in a V shape, a thin-walled type seal can be formed. Therefore, by using the thin-walled seal thus formed, it becomes possible to mount the seal on a thin portion in the radial direction of the bearing without processing the outer ring 15 or the inner ring 16. Further, according to the seal structure of the bearing of the present embodiment, the seal 10 can be press-fitted into the bearing by pushing the bent portion 11b of the L-shaped cored bar, so that the clearance of the press-fitting jig should be large. The seal 10 can be correctly press-fitted, and press-fitting defects can be eliminated. In the above embodiment, the rubber material 12 is formed so as to cover the inner surface of the base portion 11a of the core metal 11, and the lip is integrally formed at the tip portion thereof.
Forming thirteen. However, the present invention is not limited to this, and the lip 13 may be directly formed at the tip of the base 11a of the cored bar 11, for example.

[Effect of device]

As is clear from the above, the bearing seal structure of the present invention has the lip formed at the tip of the base portion extending in the axial direction in the core bar formed in the L-shaped cross section, so that the radial direction in the core bar is improved. The thickness of the seal in the radial direction can be reduced as compared with the case where a lip is formed at the tip of the extending bent portion. Therefore, the seal according to the present invention can be mounted on a portion of the bearing that is thin in the radial direction. Further, when the seal according to the present invention is press-fitted into the bearing, the bent portion of the core metal extending in a radial direction in a wide area is inevitably pushed, so that the seal is securely press-fitted. It is possible to eliminate defective press-fitting.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of a seal structure for a bearing according to the present invention, FIG. 2 is a mounting view of the seal shown in FIG. 1 on a bearing, and FIG. FIG. 4 is a sectional view of a conventional seal, and FIGS. 4 to 7 are diagrams showing a state in which the seal is attached and a comparative view. 10 ... Seal, 11 ... Core metal, 11a ... Base, 11b ... Bent, 12 ...
Rubber material, 13 ... Lip, 15 ... Outer ring, 16 ... Inner ring.

Claims (1)

[Scope of utility model registration request] 1. An outer ring of a bearing which is formed in an L-shaped cross section having a ring-shaped base portion extending in the axial direction and a bent portion extending in the radial direction and connected to one end of the base portion. A core bar attached to one of the inner rings and an elastic body, and a lip formed at the tip of the base of the core bar and slidingly contacting the other peripheral surface of the inner ring or the outer ring of the bearing. A bearing seal structure characterized by being provided.