JPH10318269A - Bearing seal with axial lip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost bearing seal to be excellent in molding workability freed from abnormal deformation of a bearing seal, in a sealing material to be mounted between two members effecting relative rotation and effect cut-off and sealing of the internal part and the external part thereof. SOLUTION: In a bearing seal having an axially protruding axial lip 2a consisting of a reinforcing ring 1 and an elastic substance 2, during stacking, a protrusion 2b is provided to constrain the tip part 21a of the axial lip 2a being formed in an accurate shape on the back of the bearing seal. This constitution, when a number of pieces are stacked in the same train, maintains a lip shape, stopping an axially constrained expansion deformation force, by the axial lip 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal member which is mounted between two members which rotate relative to each other and which seals the inside and the outside of the member, and more specifically, the shape of a bearing seal attached to a bearing which is a bearing portion. Regarding improvement.

[0002]

2. Description of the Related Art Conventionally, most bearing seals comprise an elastic body such as synthetic rubber or synthetic resin and a reinforcing ring using a rigid material for reinforcing the elastic body. A seal lip formed of the elastic body is used as a mating member. To make a sealing effect. In recent years, various improvements in performance have been demanded for the bearing seal, and a type provided with a plurality of seal lips and a type provided with an axial lip extending in the axial direction have been developed and implemented.

[0003]

However, the elastic body used here is formed of a rubber-like material, but the rubber-like material is deformed under a certain load or more even after molding and curing. It has a major drawback that it will leave deformation forever (permanent deformation). In the case of a bearing seal that has an axial lip that protrudes in the axial direction during storage in a stacked state or mounting on a mechanical device, the axial lip However, there was no possibility that the lip would contact and interfere with each other and cause abnormal deformation of the lip.

In order to eliminate such a serious drawback,
A bearing seal structure having a protruding ring (2c) that forms a large space capable of holding an axial lip (2a) on an end face as shown in Japanese Utility Model Laid-Open No. 1-24855 of FIG. 3 has been developed. However, the projecting ring (2c) projecting in the axial direction is inevitably large in shape, and the location of the axially projecting ring (2c) is also large.
Therefore, the degree of freedom in designing the bearing seal itself is greatly restricted, and it is naturally disadvantageous in weight and molding workability. The present invention has been made in view of the above-mentioned many disadvantages, and has as its object to provide an inexpensive bearing seal excellent in molding workability without abnormal deformation.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a reinforcing ring (1) made of metal or the like having sufficient strength and an elastic body (such as synthetic rubber or synthetic resin) are used. Axial lip (2)
a) wherein a projection (2b) for radially restraining a tip (21a) of the axial lip (2a) when the bearing seal is superimposed on the back surface of the bearing seal is provided. It is characterized by:

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention having the above structure has the following excellent functions. That is, the present invention relates to FIGS.
As shown in FIG. 1, the axially extending axial lip (2a) provided on the bearing seal is provided with a projection (2b) for radially restraining the distal end (21a) of the axial lip (2a).
When many pieces are stacked in the same row during storage or transportation, as shown in FIG.
When a) comes into contact with the back surface of the bearing seal, the tip (21a) fits into the projection (2b) and is fixed. Even when a large axial load is applied from this state, the distal end portion (21a) of the axial lip (2a) is restrained in the radial direction by the projection (2b) and the deformation force for expanding the diameter is stopped. The lip shape is maintained as it is, and the entire axial lip (2a) receives the load and prevents deformation. Such an axial restraining action is to make the axial lip (2a) projecting in a funnel shape into a triangular strong structure, so that even if a large axial load is applied for a long period of time, it does not allow a settling deformation,
The tip (21a) of the axial lip (2a) keeps the same smooth contact state as it is mounted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a ring-shaped projection (2b) is formed on the back surface of a bearing seal for the purpose of suppressing deformation of an axial lip (2a) extending in the axial direction. When the tip (21a) of the axial lip (2a) is
It is important to have a positional relationship of being arranged to fit inside of b), and it is not necessary to protrude greatly in the axial direction if they can be superposed smoothly. As shown in FIG. 2, this small protruding shape is formed by forming the protrusion (2b) in a ring shape (22b), and in the case where strong weight reduction is required, it is formed to protrude at an indefinite or constant interval to form an axial lip (2a). )
It may be an uneven shape (23b) that partially restricts the tip portion (21a) in the radial direction.

[0008]

According to the above configuration, the following excellent effects can be obtained. In the present invention, the axial lip (2a) is not positively contacted with another bearing seal during stacking, and the axial lip (2a) is positively stacked.
a) is a space-saving structure for contacting other members. Even if this structure is used, the lip is restrained to prevent its deformation, and this fitting structure has a great advantage also in stacking workability. The axial lip (2
The tip (21a) of (a) is in a restrained state of fitting into the projection (2b), so that the lip shape retention is strong, and even if a large axial load is applied for a long period of time, it does not allow the settling deformation. Furthermore, the protrusion (2b) of the present invention requires only a small protruding shape, so that there is no disadvantage in weight and the degree of freedom in designing the bearing seal is large. Also, as described above, since each bearing seal has a very small contact area, it does not allow any viscous adhesion peculiar to the elastic body, and furthermore, the alignment of the cores of each bearing seal and the elimination of the inclination due to deformation eliminate the device. Dramatically improves handling when mounting

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a conventional structure example not using the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement ring 2 Elastic body 2a Axial lip 21a Tip 2b Projection 2c Projection ring

Claims (3)

[Claims] 1. A bearing seal comprising a reinforcing ring made of metal or the like and an elastic body made of synthetic rubber or the like and having an axial lip extending in an axial direction, wherein the axial direction is formed when the bearing seal is superimposed on the back surface of the bearing seal. A bearing seal with an axial lip, characterized in that a projection for restricting the tip of the lip in the radial direction is provided. 2. The bearing seal with an axial lip according to claim 1, wherein said projection is formed in a ring shape. 3. The bearing seal with an axial lip according to claim 1, wherein said projections are formed in an irregular shape at regular intervals.