JP2969246B2 - Bearing seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing seal mounted on a bearing, and more particularly, to a bearing seal excellent in mounting and fixing properties to a bearing.

[0002]

2. Description of the Related Art Conventionally, a bearing seal mounted on a bearing, as shown in FIG. 7, will be described with reference to the accompanying drawings. As shown in FIG. In mounting the elastic body (2), as shown in FIG. 8, the side surface of the bearing seal is pressed with a press-fitting jig (7) (indicated by an arrow) to be provided on the bearing (1). The fitting portion (22) of the bearing seal is press-fitted into the fitting groove (4) to secure it.

[0003]

However, the fitting portion (22) of the bearing seal is designed to exert a certain fixing action when it is fitted at a regular position. In addition, no sufficient consideration has been given to the improvement of workability or the like from the viewpoint of molding or manufacturing cost. That is, in the conventional bearing seal, the fitting portion (2) of the bearing seal is fitted in the fitting groove (4) of the bearing (1).
Since the mounting is performed with the 2) pushed in, the fitting portion (2
As shown in FIG. 8, when the press-fit jig (7) is pressed by the press-fitting jig (7), the bearing (1) is compressed because there is no clearance between the bearing (1) and the fitting opening peripheral surface (11). ′), Deforms laterally outward in the axial direction, and comes into pressure contact with the peripheral surface (11) of the fitting opening of the bearing (1) to make the press force excessive.
When a strong press force is applied to the fitting portion (22) made of the elastic body (2) in this way, a part of the fitting portion (22) is located at the entrance of the fitting groove (4) as shown in FIG. Ear seals (23) remaining outside may be generated, or the bearing seal may jump out to the outer surface due to springback of the fitting portion (22). In the worst case, the fitting portion (22) may be cracked. There is also a risk of inviting.

[0004] In this case, the bearing seal not only causes an eccentricity phenomenon, but also greatly reduces the fixing force thereof, and easily causes a serious problem that the bearing seal may fall off due to co-rotation or slight vibration. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described drawbacks, and has as its object to provide a bearing seal capable of dramatically increasing the insertability and obtaining a strong fitting and fixing force.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, a bearing seal comprising an elastic body (2) and a reinforcing ring (3) is provided. ) Is curved so that the peripheral portion thereof approaches the fitting opening peripheral surface (11) of the bearing (1), and a thick portion (5) is formed outside the thick portion (5). Characterized in that a concave groove (6) is provided.

[0006]

According to the present invention, the above-mentioned structure has the following excellent effects. In the bearing seal of the present invention, FIG.
As shown in (1), a reinforcing ring (3) made of a highly rigid material such as a metal is curved into a shape (32) that is warped to the back of the bearing (1, 1 '), and a surface perpendicular to the axial direction is provided on the fixed portion side. The edge (31) of the bearing (1) is arranged at the back of the bearing (1), and projects from the edge (33) in an outwardly inclined direction and is fitted into the fitting groove (4) of the bearing (1). A thick part (5) made of an elastic body (2) is formed, and a concave groove (6) is provided circumferentially on an inner peripheral side of the thick part (5). The body (2) is inserted with a low pressure input while minimizing the elastic deformation of the body (2), and realizes a strong fitting fixing force with sufficient flexibility in fitting.

In mounting the bearing seal,
As shown in FIG. 2, when the bearing seal is pushed in from outside of the bearing (1, 1 ') with a press-fitting jig (7), the thick portion (5) of the bearing seal comes into contact with the fitting opening peripheral surface (11). Deformation starts, but the bearings (1,
1 ') The edge (31) of the reinforcing ring (3) arranged at the back of
Is passed through the fitting opening peripheral surface (11) first, so that the thick portion (5) that passes therethrough is pulled by the edge portion (31), and its diameter is reduced to be smoothly inserted. You. This action of reducing the diameter is increased by the fact that the concave groove (6) provided on the outer side of the thick part (5) is crushed and deformed, so that it can be mounted more smoothly. (The broken line shows the shape of the thick portion 5 before deformation.) At this time, when the bearing is mounted on the bearing (1), the peripheral surface of the fitting opening (11) of the bearing (1) and the periphery of the reinforcing ring (3) are removed. The peripheral portion (33) fits into the fitting opening peripheral surface (11) with a slight gap, as shown in FIG. A state is formed, and from the fitted state, the fitting opening peripheral surface (11) is formed.
As a guide is inserted by sliding pressure, extremely accurate mounting without eccentricity becomes possible. The bearing seal mounted in the fitting groove (4) in this manner is largely released from the strongly deformed state, and is surely fixed by an appropriate rebound resilience.

During operation of the bearing (1, 1 ') provided with the bearing seal, if the internal pressure increases due to a rise in the temperature of the internal engine or the like, the internal pressure increases as shown by an arrow (b) in FIG. An attempt is made to push the bearing seal outward, but it is sandwiched between the peripheral edge (33) of the reinforcing ring (3) and the corner (41) of the fitting groove (4) of the bearing (1). The thick portion (5) is placed in a state where it is expanded in the radial direction by receiving a compressive force by the close arrangement (a), and is pushed into the fitting groove (4) to expand and deform (broken line portion). It does not allow the pressure to fall off and cause it to fall off.

[0009]

In order to carry out the present invention, the shape of the edge (31) of the reinforcing ring (3) and the thick portion (5) of the elastic body (2) are changed as shown in FIG. ) Exerts an action of pulling most of the thick portion (5) into the fitting groove (4), so that the edge portion (31) is located at the back of the bearing (1) with respect to the elastic body (2). It is important that the reinforcing ring (3) is curved.
Is preferably a deeply curved shape in order to store a large amount of deformation mass of the thick part (5). The thickened portion (5) is provided with a reinforcing ring (3) to prevent cracks and breaks due to the above-described tensile deformation and to minimize the gap (a) between the bearing (1) and the fitting peripheral surface (11). ) Is formed from the end face of the peripheral portion (33). A specific example of the proximity dimension (a) between the edge portion (31) and the fitting opening peripheral surface (11) of the bearing (1) is as follows. In the case of a bearing seal having a diameter of about 30 mm to 60 mm, 0.2 mm to 0 mm. By setting and providing a gap of about 0.4 mm, it is possible to insert with a low press-fit load, and when mounted, high fixation and weakness can be obtained.

The circumferential groove (6) for allowing insertion and pulling deformation is not only a groove formed in an annular shape but also a groove shown in FIG.
Engraved grooves (6) intermittently arranged with a ring like
It is possible to form such as 1) or to provide a convex part (62) partially protruding into the groove as shown in FIG. 6, and it is possible to respond to any required performance by associating the depth with the mouth width. it can.

[0011]

According to the present invention, the mounting of the bearing seal requires only a low pressure input to the bearing (1) from the outside, and the fixation is performed by the thick portion (5) which retains a large elasticity.
Shows a strong springback effect and achieves a firm fixation with a high fixed load,
And a great improvement in the weakness. Further, in the bearing seal of the present invention, since the concave groove (6) of the thick portion (5) is reduced in diameter during the fitting to assist the mounting thereof, it is not necessary to provide the fitting groove (4) of the bearing (1) widely. It is also possible to form a normal groove shape or conversely a narrow groove shape. In addition, the edge (31) of the reinforcing ring (3) is left close to the thick portion (5) in the fitting groove (4) due to its close proximity to the reinforcing ring (3). It is a stiff one.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mounted state of the present invention.

FIG. 2 is an enlarged partial sectional view showing a process leading to FIG. 1;

FIG. 3 is a partial sectional view showing a state before reaching FIG. 2;

FIG. 4 is a partial cross-sectional view showing a state where the present invention is mounted and an internal pressure is applied.

FIG. 5 is a partial plan view showing an embodiment of the present invention.

FIG. 6 is a partial plan view showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a mounting state of a conventional example not using the present invention.

FIG. 8 is an enlarged sectional view showing a process leading to FIG. 7;

FIG. 9 is an enlarged sectional view showing one defective state in mounting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing 11 Fitting opening peripheral surface 2 Elastic body 3 Reinforcement ring 31 Edge end 32 Warped shape 33 Edge peripheral part 4 Fitting groove 41 Corner part 5 Thick part 6 Concave groove 61 Engraved groove 62 Convex part 7 Press-fit jig a Gap between the edge and the fitting surface

Claims (1)

(57) [Claims] 1. A bearing seal comprising an elastic body mounted on a bearing and sealing the inside and outside thereof and a reinforcing ring, wherein the reinforcing ring has a shape that is warped and curved to increase rigidity, and a fixed portion side thereof is perpendicular to the axial direction. The peripheral edge is arranged at the innermost portion of the bearing, and the peripheral edge is disposed close to the peripheral surface of the fitting opening of the bearing. A bearing seal comprising: a thick portion formed of an elastic body; and a concave groove engraved on an inner peripheral side portion of the thick portion.