JP3280301B2 - Seal plate for bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a plastic sealing plate used for a sealed bearing.
In particular, it is used for bearings with an annular locking groove formed on the inner peripheral surface of the outer ring.Even if the seal plate expands or contracts due to a thermal cycle load or expands due to water absorption, etc. The present invention relates to a seal plate for a bearing capable of almost completely preventing oozing to the outside.

[0002]

2. Description of the Related Art Generally, in the fields of office equipment and home electric appliances, a large number of ultra-small sealed bearings in which grease (lubricant) is sealed are used. or,
A plastic seal plate is widely used for the seal type bearing because it can be easily inserted and has good sealing performance.

Conventionally, as this kind of plastic sealing plate, for example, one having a structure disclosed in Japanese Utility Model Publication No. 7-32985 is known. That is, the sealing plate 6
As shown in FIG. 8, an annular projection 6a having a substantially trapezoidal cross section is formed on the inner surface of the outer peripheral edge, and a triangular cross section is formed on the outer surface of the outer peripheral edge so as to protrude to the side of the seal plate 6. Are formed integrally with each other.

The cross-sectional shape formed on the inner peripheral surface of the outer race 7 by applying the seal plate 6 to the inner peripheral surface of the side surface of the outer race 7 of the bearing and pressing the outer peripheral edge evenly inward. When inserted into the substantially U-shaped locking groove 7 ', as shown in FIG. 9, the protrusion 6a abuts on the inner side surface 7a of the locking groove 7' in a surface-contact state, and the raised portion 6b engages with the locking groove 7 '. ′ In a bent state.

[0005] As a result, the sealing plate 6 is tightly and firmly inserted into the locking groove 7 'by the elastic force of the raised portion 6b, thereby securely sealing the gap between the outer ring 7 and the inner ring 8. That is, the outer peripheral edge of the seal plate 6 elastically abuts against the inner side surface 7a and the outer side surface 7b of the locking groove 7 '.
A small gap is formed between the inner peripheral edge of the inner ring and the inner ring 8 to prevent the grease sealed between the inner and outer rings 8 and 7 from leaking to the outside and infiltrating dust and the like between the inner and outer rings 8 and 7. are doing. In FIG. 9, reference numeral 9 denotes a plurality of balls rotatably disposed between the inner and outer rings 8, 7, and reference numeral 10 denotes a retainer for holding the balls 9 at equal intervals.

[0006]

As described above, the inside of the seal plate 6 of the bearing is filled with lubricating grease, but leakage of the grease to the outside is mainly caused by the locking groove 7 '. Of inner surface 7a and protrusion 6a of seal plate 6
Surface pressure of the contact surface, the degree of adhesion of the contact surface, the size of the contact area, the surface pressure and the degree of adhesion of the contact surface between the outer surface 7b of the locking groove 7 'and the raised portion 6b of the seal plate 6, etc. The sealing function is improved by increasing the surface pressure and the contact area of the contact surface, so that the leakage (bleeding) of grease is reduced.

However, in reality, in view of the mechanical strength of both end edges of the outer ring 7 and the insertion resistance when the seal plate 6 is inserted, etc.
There is a certain limit to the magnitude of the elastic reaction force that can be held by the protrusion 6a and the protrusion 6b of the seal plate 6. Also, the length l of the contact portion between the inner surface 7a of the locking groove 7 'and the projection 6a of the seal plate 6 is constant in view of the thickness of the bearing outer ring 7, the shape of the locking groove 7', and the like. As a result, there is a certain limit in increasing the length dimension 1 to increase the contact area between the inner side surface 7a and the protrusion 6a. Of course, since the seal plate 6 is formed of a relatively hard engineering plastic, the deformability is low, and it is difficult to completely adhere the seal plate 6 to the locking groove 7 '. As a result, in the conventional seal type bearing using the plastic seal plate 6 as shown in FIG. 9, it is difficult to eliminate the leakage of the grease to the outside, and the centrifugal force due to the rotation of the outer ring 7 makes it extremely small. However, grease oozes out to the outer side of the seal plate 6 through the locking groove 7 '.

The bleeding of the grease becomes more severe as the operating temperature of the seal type bearing increases. For example, when the operating temperature is 80 ° C. or higher, the viscosity of the lubricating grease is greatly reduced, and the bleeding becomes easy. Also, the sealing plate 6 itself undergoes a heat cycle of heating and cooling or absorbs moisture in the atmosphere, so that the crystal structure of the resin material is greatly changed. As a result, the outer diameter of the sealing plate 6 is reduced. Fluctuates and grease leakage increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and enhances the sealing function of a sealing plate against leakage of lubricating grease so that a sealed type bearing can be operated at a high temperature. Needless to say, an object of the present invention is to provide a bearing seal plate which can substantially completely prevent seepage of lubricating grease even after long-term use.

[0010]

In order to achieve the above object, a bearing seal plate according to a first aspect of the present invention comprises an inner surface 2b formed at both ends of an inner peripheral surface 2a of an outer race 2.
Inner surface 2b of the cross section consisting of an outer surface 2d which is inclined to the bottom surface 2c and the outer opening shape 'and inserting the outer peripheral edge portion in the locking grooves 2' locking groove second annular generally U-shaped and in Plasti <br/> click made bearing sealing plate 1 annular having an elastic force so as to resiliently contact the outer surface 2d, the
An annular edge portion 2f formed at the boundary between the outer surface 2d of the locking groove 2 'and the inner peripheral surface 2a of the outer ring 2 continuous with the outer surface of the outer peripheral edge of the seal plate 1 is inclined. The biting surface 1d is formed on the inner surface of the outer peripheral edge of the seal plate 1,
The top surface is in close contact with the inner surface 2b of the locking groove 2 'in a state of surface contact.
When the protrusions 1a each having a substantially trapezoidal cross section are formed in an annular shape,
The inner surface of the seal plate 1 on the inner peripheral edge side of the projection 1a.
Forming a protruding sealing piece 1c protruding toward
And, the time of loading of the sealing plate 1 of the locking grooves 2 'in the sea
The edge 2f is cut into the biting surface 1d provided on the outer surface of the outer peripheral edge of the sealing plate 1, and the top surface of the projection 1a provided on the inner surface of the outer peripheral edge of the sealing plate 1 is engaged with the locking groove 2 '. It is in close contact with the inner surface surface contact state to 2b, further protrusion for the sealing
The outer peripheral surface of the piece 1c is brought into close contact with the inner peripheral surface 2a of the outer ring 2.
Thus, the sealing performance of the sealing plate 1 is improved .

According to a second aspect of the present invention, in the first aspect, the inner surface 2b of the locking groove 2 'is continuous with the inner surface 2b.
An annular step 2e is formed at the boundary between the outer ring 2 and the inner peripheral surface 2a.
And the sealing protruding piece 1c is brought into close contact with the step portion 2e.
It is designed to be inserted .

According to a third aspect of the present invention, in the first aspect, the inner peripheral surface 2a of the outer race 2 and the inner side surface 2b and the outer side surface 2d of the locking groove 2 'are barrel-polished to obtain a surface. Roughness small
It is designed to be small .

[0013]

[0014]

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially enlarged sectional view of a bearing (rolling bearing) in which a bearing seal plate 1 according to a first embodiment of the present invention is inserted. In FIG. 1, reference numeral 2 denotes a center of an inner peripheral surface 2a. An outer ring having a raceway surface formed in a portion thereof, an inner ring having a raceway surface formed in a central portion of an outer peripheral surface, a plurality of balls rotatably disposed between the raceways of the inner ring and the outer ring, Are held at equal intervals.

An annular locking groove 2 'having a substantially U-shaped cross section is formed at both ends of the inner peripheral surface 2a of the outer ring 2.
The locking groove 2 ′ is formed in a vertical inner surface 2 b orthogonal to the axis φ of the bearing, a bottom surface 2 c continuous with the inner surface 2 b and parallel to the axis φ of the bearing, and a bottom surface 2 c
And an outer side surface 2d which is formed continuously and inclined in an outwardly opening shape.

An annular step 2e having a lateral length L and a depth h is formed at the boundary between the inner surface 2b of the locking groove 2 'and the inner peripheral surface 2a of the outer race 2 continuing therefrom. Have been. still,
The length L and the depth h of the stepped portion 2e are determined by the size of the internal space of the seal type bearing, that is, for the seal protruding from the inner peripheral edge of the protrusion 1a of the seal plate 1 described later in the direction of the inner surface. It is regulated by the distance between the tip of the protruding piece 1c and the retainer 5, and the like.

Further, the inner diameter d ₁ at the end of the inner peripheral surface 2a of the outer ring 2
(The inner diameter of the inner peripheral surface 2a outside the locking groove 2 ')
Slightly larger than the inner diameter d ₂ of the portion forming a raceway surface of the ball 4, sediment is and formed slightly smaller than the outer diameter D of the sealing plate 1, inserting the seal plate 1 to the locking grooves 2 ' It is easy to do.

The inner peripheral surface 2a of the outer ring 2 and the inner surface 2b and the outer surface 2d of the locking groove 2 'are polished by barrel processing to have extremely small surface roughness. It comes into close and good contact with the peripheral portion. The annular edge portion 2f formed at the boundary between the outer surface 2d of the locking groove 2 'and the inner peripheral surface 2a of the outer ring 2 which is continuous with the outer surface 2d is formed to have a very small arc-shaped cross section. Even if the seal plate 1 bites into a biting surface 1d of the seal plate 1 described later, the seal plate 1 is not damaged.

The seal plate 1 according to the first embodiment of the present invention has elasticity, flexibility, resilience, flex fatigue, creep resistance, sealability, heat resistance, chemical resistance, abrasion resistance and the like. The base material is an engineering plastic material with excellent oil resistance and extremely low surface hardness, and mixed with glass fiber that is extremely low in expansion and contraction and has excellent heat resistance, oil resistance and rigidity in an amount of about 5 to 15% by weight. The intermediate portion and the inner peripheral portion facing the retainer 5 are formed thinner than the outer peripheral portion so as not to contact the retainer 5.

The engineering plastic material has an extremely low surface hardness (measurement method is ASTM D22).
An engineering plastic (for example, a polyester resin) having a surface hardness of 30 to 80 at 40 is used. As the glass fiber, a glass fiber having a fiber diameter of 3 to 20 μm and a fiber length of 30 to 50 μm is used.

As described above, a glass fiber having extremely small expansion and contraction and excellent in heat resistance and rigidity is mixed into a base material made of an engineering plastic material having excellent elasticity, flexibility, heat resistance and mechanical properties. As a result, the seal plate 1 having both appropriate rigidity and elasticity, good dimensional accuracy, and small dimensional change can be obtained. as a result,
This seal plate 1 prevents warpage after being inserted into the locking groove 2 'of the bearing, and has extremely good adhesion to the locking groove 2' of the bearing.

On the inner surface of the outer peripheral edge of the seal plate 1,
As shown in FIGS. 1 to 3, a protrusion 1a having a substantially trapezoidal cross-sectional shape, which is in close contact with the inner surface 2b of the locking groove 2 'in a surface contact state, is formed in an annular shape. The surface is in close contact with the inner side surface 2b of the locking groove 2 'in a surface contact state. In addition, the inclined surface on the outer peripheral side of the protrusion 1a is an insertion inclined surface 1b.

On the inner peripheral edge side (inside of the flat surface) of the projection 1a of the seal plate 1, a length protruding toward the inner side surface of the seal plate 1 (leftward in FIG. 1) is substantially equal. An annular sealing projection 1c having a smooth outer peripheral surface close to L is provided. When the sealing plate 1 is inserted into the locking groove 2 ', the outer peripheral surface of the sealing projection 1c is Inner peripheral surface 2a of outer ring 2
Step 2 provided at the boundary between the locking groove 2 'and the inner surface 2b
e is brought into close contact with the inner peripheral surface of e. As a result, the movement of the seal plate 1 in the diametrical direction is restricted, and as a result, the insertion position of the seal plate 1 is necessarily concentric with the axis φ of the bearing.

Furthermore, an annular edge formed at the boundary between the outer surface 2d of the locking groove 2 'and the inner peripheral surface 2a of the outer race 2 continuing to the outer surface of the outer peripheral edge of the seal plate 1. An inclined biting surface 1d that bites into 2f is formed, and when the seal plate 1 is inserted into the locking groove 2 ', the edge portion 2f bites into the biting surface 1d.
The bite of the edge 2f into the bite surface 1d seals the gap between the outer peripheral edge of the seal plate 1 and the outer surface 2d of the locking groove 2 ', thereby preventing grease from seeping out. or,
An annular concave portion 1e having a substantially trapezoidal cross section is formed on the outer surface of the seal plate 1 and at an inner position of the biting surface 1d, and is used when the seal plate 1 is inserted into the locking groove 2 '. The outer peripheral edge of the seal plate 1 can be easily reduced in diameter.

The outer diameter D of the seal plate 1 is slightly larger than the inner diameter d _{1 of the} end of the inner peripheral surface 2a of the outer race 2 (the inner diameter of the inner peripheral surface 2a outside the locking groove 2 '). Being formed,
It is configured to allow a slight gap G ₁ between the bottom surface 2c of 'locking grooves 2 when inserted into' locking groove 2. Further, the inner diameter of the sealing plate 1 is also set to allow a slight gap G ₂ between the outer peripheral surface of the inner ring 3 when inserted into the locking grooves 2 '. Further, the thickness of the outer peripheral edge portion of the seal plate 1 is set such that the edge portion 2f bites into the biting surface 1d when the sealing plate 1 is inserted into the locking groove 2 '.

In this example, the outer diameter D of the seal plate 1 is 14.
0 mm, the thickness t ₁ of the outer peripheral edge of the seal plate ₁ is 0.75
mm, the thickness t ₂ of the intermediate portion and the inner peripheral edge portion of the seal plate 1.
Is 0.38 mm, and the height H of the sealing projection 1c is 0.3 mm.
Each is set to 15 mm. Also, the inclined surface for insertion 1b
Inclination angle alpha ₁ of 30 ° to the axis of the sealing plate 1 phi
The inclination angle α ₂ of the biting surface 1 d is set to 30 ° with respect to the side surface of the seal plate 1, and the inclination angle α ₃ of the outer surface 2 d of the locking groove 2 ′ is set to 20 ° with respect to the side surface of the outer ring 2. Have been. Furthermore, when the sealing plate 1 is inserted into the locking groove 2 'of the outer race 2, the outer peripheral surface of the sealing plate 1 and the bottom surface 2c of the locking groove 2'
Gap G ₁ of 0.05mm between the, 0.1 mm of gap G ₂ between the inner circumferential surface 2a and the outer peripheral surface of the inner ring 3 of the sealing plate 1
Are formed respectively.

When the above-mentioned seal plate 1 is inserted into the bearing, first, the insertion inclined surface 1b is applied to the inner peripheral edge of the outer surface of the outer ring 2, and the outer peripheral edge of the seal plate 1 is And press evenly. Then, after the sealing plate 1 is bent naturally due to its elasticity, the outer peripheral edge portion is inserted into the locking groove 2 ′ of the outer ring 2.

That is, after the sealing plate 1 is inserted into the locking groove 2 ', as shown in FIG. 1, the top surface of the projection 1a is in close contact with the inner surface 2b of the locking groove 2'. At the same time, the sealing protruding piece 1c is closely fitted and inserted into a step 2e provided at the boundary between the inner peripheral surface 2a of the outer race 2 and the inner surface 2b of the locking groove 2 '. At the same time, the biting surface 1 of the seal plate 1
d, the outer surface 2d of the locking groove 2 'and the outer ring 2 continuous therewith.
Annular edge portion 2f formed at the boundary with inner peripheral surface 2a
The outer peripheral edge of the sealing plate 1 is inserted into the locking groove 2 ′ in a compressed state, and is tightly and firmly inserted into the locking groove 2 ′ by the elastic force of the seal plate 1. Will be done.

As described above, the seal plate 1 is formed of a plastic material having an extremely low surface hardness and elasticity, and the edge portion 2f bites into the biting surface 1d, and the projection 1a is formed by the locking groove. 2 'is elastically abutted against the inner side surface 2b of the sealing plate 1 in a state of surface contact, and the projection 1c for sealing is inserted into the stepped portion 2e in close contact with the inner peripheral surface 2b of the sealing plate 1 so that the outer peripheral edge of the sealing plate 1 is locked. The surface pressure and the degree of adhesion of the contact surface between the inner surface 2b and the outer surface 2d of the groove 2 'are increased, and the contact area between the seal plate 1 and the locking groove 2' is also increased. As a result, the outer peripheral edge of the seal plate 1 is brought into good and reliable close contact with the inner side surface 2b and the outer side surface 2d of the locking groove 2 ', and the sealability of the seal plate 1 is greatly improved. . In particular,
The inner peripheral surface 2a of the outer ring 2 and the inner surface 2b and the outer surface 2d of the locking groove 2 'are polished by barrel processing to have extremely small surface roughness. The inner side surface 2b and the outer side surface 2d of the stop groove 2 'are more securely brought into close contact with each other, and the sealing performance is further improved. Further, since the sealing plate 1 is formed of a material having a small dimensional change and the edge portion 2f bites into the biting surface 1d, even if a large temperature change occurs during use of the bearing, the sealing surface 1d and the edge portion 2d are cut off. 2f does not come into a non-contact state, and a decrease in sealing performance can be prevented. That is, the seal plate 1 can prevent the grease from seeping out from between the biting surface 1d and the edge portion 2f as long as the edge portion 2f bites into the biting surface 1d. Furthermore, since the annular edge portion 2f formed at the boundary between the outer surface 2d of the locking groove 2 'and the inner peripheral surface 2a of the outer ring 2 which is continuous with the outer surface 2d is formed in a very small arc shape, the seal plate 1 is formed. The seal plate 1 is not damaged even if it bites into the outer peripheral edge of the seal plate.

By the way, the elastic reaction force caused by the edge portion 2f bite the bite surface 1d seal plate 1, the axis φ of the bearing to the inclination angle alpha ₃ of the outer side surface 2d is small locking grooves 2 ' It looks good along. That is, since the component force acting from the outer peripheral edge portion to the inner peripheral edge portion of the seal plate 1 becomes smaller, the seal plate 1 is biased toward the locking groove 2 ′ of the outer ring 2 depending on how the seal plate 1 is inserted. Attempts to be inserted.

However, the sealing plate 1 has a sealing projection 1c inserted into the step 2e on the outer ring 2 side as described above.
Is provided, even if the sealing plate 1 is inserted into the locking groove 2 ′ in a state of being biased when the sealing plate 1 is inserted into the locking groove 2 ′ of the outer ring 2, the sealing protruding piece 1 c is sealed. The sealing plate 1 is positioned so that the plate 1 is concentric with the axis φ of the bearing. As a result, even if the inclination angle α ₃ of the outer surface 2 d of the locking groove 2 ′ is small, the sealing plate 1 is not inserted into the locking groove 2 ′ in a biased manner, and the sealing plate 1 There is no variation in the gap between the inner peripheral edge portion 1 and the inner ring 3. As a result, it is possible to prevent a decrease in sealing performance, a drop of the seal plate 1 from the locking groove 2 ′, a decrease in roundness of the outer ring 2, and the like.

Since the above-mentioned seal plate 1 is made of a plastic material having a very low surface hardness and a flexible plastic material, the seal plate 1 is not inserted into the locking groove 2 '. The diameter of the outer peripheral edge portion is easily reduced, and the resistance at the time of insertion is reduced, so that the outer peripheral edge portion can be easily and easily inserted into the locking groove 2 'with a small force. In addition, in this seal plate 1, the pushing amount is regulated by the substantially trapezoidal projection 1a at the time of insertion into the locking groove 2 ', so that the pressing force applied to the temporary seal plate 1 becomes excessive. However, the seal plate 1 is not partially crushed, and the seal plate 1 is not damaged or distorted.
Furthermore, in this seal plate 1, since the outer peripheral edge thereof is brought into contact only with the inner surface 2b and the outer surface 2d of the locking groove 2 ', a large force acts on the outer ring 2 in the radial direction. Never do. As a result, the sealing plate 1 engages with the locking groove 2 '.
Even when the outer ring 2 is inserted, the roundness of the outer ring 2 is not reduced. In addition, since the sealing plate 1 contains glass fibers, the sealing plate 1 has both appropriate rigidity and elasticity and a small dimensional change. As a result, even if the seal plate 1 is inserted into the locking groove 2 ', the warpage of the seal plate 1 is prevented. Also, even if a large temperature change occurs during use of the bearing, the deformation of the seal plate 1 becomes small, and the adhesion between the seal plate 1 and the locking groove 2 'does not deteriorate.

In the first embodiment, an annular stepped portion 2e is formed at the boundary between the inner surface 2b of the locking groove 2 'and the inner peripheral surface 2a of the outer ring 2, and this step is formed. Although the sealing protruding piece 1c formed on the sealing plate 1 is inserted into the portion 2e in a close contact state, in another embodiment, the stepped portion 2e is omitted and the sealing protruding portion of the sealing plate 1 is omitted. The piece 1c may be directly inserted into the inner peripheral surface 2a of the outer race 2 so that the outer peripheral surface of the sealing projection 1c is brought into close contact with the inner peripheral surface 2a of the outer race 2.

In the first embodiment, the outer race 2
Although only one annular step 2e is formed on the inner surface of the outer ring 2, the inner surface 2b of the locking groove 2 'and the inner peripheral surface 2a of the outer ring 2 are not shown in other embodiments. And a stepped portion 2e (two stepped portions 2e) is formed at the boundary between the stepped portion 2e and the stepped portion 2e inserted into the stepped stepped portion 2e on the seal plate 1.
You may form the sealing protrusion 1c which has a step-shaped outer peripheral surface. In this case, the contact area between the step portion 2e and the protruding piece for sealing 1c increases, and the leakage passage of the grease becomes bent to increase the passage resistance, thereby preventing the grease from seeping out more effectively. be able to.

In the first embodiment, the thickness of the middle portion of the seal plate 1 and the thickness of the inner peripheral edge portion are formed to be the same. In other embodiments, the thickness of the seal plate 1 is changed. The middle part of the first part may be formed thinner than the outer peripheral part, and the inner part may be formed thicker than the intermediate part. Further, the inner peripheral edge of the seal plate 1 is formed thick, and a step is formed on the inner surface of the inner peripheral edge, and a maze-shaped gap is formed between the inner peripheral edge and the step formed on both ends of the outer peripheral surface of the inner ring 3. May be formed.

FIGS. 4 and 5 are partially enlarged sectional views of a bearing (rolling bearing) in which a bearing seal plate 1 according to a second embodiment of the present invention is inserted. It is formed of the same material as the seal plate 1 according to the first embodiment so that its cross-sectional shape is symmetrical with respect to the center line in the thickness direction. Biting surfaces 1d and 1f are respectively formed.

That is, the outer peripheral surface of the seal plate 1 is in close contact with the outer surface 2d of the locking groove 2 'in a surface contact state, and is continuous with the outer surface 2d of the locking groove 2'. Edge portion 2 formed at the boundary with inner peripheral surface 2a of outer ring 2
An inclined biting surface 1d into which f bites is formed. The inner surface of the outer peripheral edge of the seal plate 1 is in close contact with the inner surface 2b of the locking groove 2 'in a surface contact state, and the inner surface 2b of the locking groove 2' Inner circumference 2
An inclined biting surface 1f into which an annular edge portion 2g formed at the boundary with a is cut is formed. Further, insertion inclined surfaces 1 b are formed at both ends of the outer peripheral surface of the seal plate 1, and each insertion inclined surface 1 b is also formed symmetrically with respect to the center line of the seal plate 1.

On the other hand, both the inner surface 2b and the outer surface 2d of the locking groove 2 'of the outer ring 2 are formed so as to be inclined with respect to the widthwise center line of the locking groove 2'. The angle is set to be the same as the inclination angle of the biting surfaces 1d and 1f of the seal plate 1. Also, the inner peripheral surface 2a of the outer ring 2 and the locking groove 2 '
The inner side surface 2b and the outer side surface 2d are polished by barrel processing so that the surface roughness is extremely small, so that the inner side surface 2b and the outer side surface 2d are in close contact with the outer peripheral edge of the seal plate 1 in an excellent and reliable manner. Further, an annular edge portion 2f formed at the boundary between the outer surface 2d of the locking groove 2 'and the inner peripheral surface 2a of the outer ring 2 continuing thereto, and the inner surface 2b of the locking groove 2' and the continuation thereof. The annular edge portion 2g formed at the boundary with the inner peripheral surface 2a of the outer ring 2 has a very small arc shape in cross section, and even if it cuts into both biting surfaces 1d and 1f of the seal plate 1, the sealing is performed. The plate 1 is not damaged.

This seal plate 1 can also provide the same functions and effects as those of the seal plate 1 according to the first embodiment. Particularly, since the sealing plate 1 has the biting surfaces 1d and 1f formed on both side surfaces of the outer peripheral edge portion, it is possible to more effectively prevent the grease from seeping out through the locking groove 2 '. . Further, since the seal plate 1 is formed symmetrically to the left and right, there is no need to consider the front and back of the seal plate 1 when inserting the seal plate 1 into the locking groove 2 ′. This is unnecessary, and the trouble required for this can be saved.

In the second embodiment, the thickness of the seal plate 1 is made the same except for the outer peripheral edge portion. However, in other embodiments, the thickness is shown in the drawings. However, the middle part of the seal plate 1 may be formed thinner than the outer peripheral part, and the inner peripheral part may be formed thicker than the intermediate part. Further, the intermediate portion and the inner peripheral edge of the seal plate 1 may be formed to be thinner than the outer peripheral edge.

FIGS. 6 and 7 are partially enlarged sectional views of a bearing (rolling bearing) in which a bearing seal plate 1 according to a third embodiment of the present invention is inserted. The seal protruding piece 1c and the concave portion 1e of the seal plate 1 according to the first embodiment are omitted, and the thickness of the intermediate portion and the inner peripheral edge portion of the seal plate 1 according to the first embodiment is reduced. It is made thinner than the wall thickness.
In this seal plate 1, since the protruding piece 1c for sealing is omitted, the step portion 2e is also omitted from the outer ring 2. This seal plate 1 can also provide the same operation and effects as those of the seal plate 1 according to the first embodiment.

In each of the above embodiments, a polyester-based resin is used. However, the material of the plastic material is not limited to the above-mentioned one, and the elasticity, flexibility, rebound Properties, flex fatigue resistance, creep resistance, sealability, heat resistance, chemical resistance, abrasion resistance, oil resistance, etc., and a very low surface hardness, polyamide-based or polyurethane-based It may be a plastic material.

In each of the above embodiments, the seal plate 1 is formed by integrally molding a material obtained by mixing a glass material with a plastic material as a base material. In the form of, omit the glass fiber,
The seal plate 1 may be formed only of a plastic material.

[0045]

As described above, in the bearing seal plate of the present invention, the seal plate is formed of a plastic material having an extremely low surface hardness and elasticity, and the outer peripheral edge of the seal plate is formed. The edge formed at the boundary between the outer surface of the outer ring locking groove and the inner peripheral surface of the outer ring is cut into the biting surface formed on the outer surface, and the inner surface of the outer peripheral edge of the seal plate is inserted into the locking groove. Since the sealing plate is brought into close contact with the side surface in a surface contact state, the surface pressure, the degree of adhesion, and the like of the contact surface between the outer peripheral edge of the seal plate and the inner and outer surfaces of the locking groove are increased. as a result,
The outer peripheral edge of the seal plate is brought into good and reliable close contact with the inner side surface and the outer side surface of the locking groove, and the sealability of the seal plate is greatly improved. In addition, since the sealing plate has an edge portion that bites into the biting surface, even if the sealing plate itself is slightly reduced in diameter due to a temperature change, the biting surface and the edge portion do not come into a non-contact state. In addition, a reduction in sealing performance can be prevented.

Further, the seal plate for bearing of the present invention comprises:
The following effects are further obtained in addition to the above effects . That is,
On the inner surface of the outer peripheral edge of the seal plate, a substantially trapezoidal cross-sectional shape that is in close contact with the inner surface of the locking groove in a surface contact state is formed in an annular shape. Forming a protruding piece for sealing protruding toward the inner side surface, when the seal plate is inserted into the locking groove, the outer peripheral surface of the protruding piece for sealing is brought into close contact with the inner peripheral surface of the outer ring, or The protruding piece is tightly inserted into an annular step formed at the boundary between the inner surface of the locking groove and the inner peripheral surface of the outer ring. As a result, when the sealing plate is inserted into the locking groove, the diametrical insertion position is regulated by inserting the sealing protruding piece into the inner peripheral surface of the outer ring or the step portion, There is no case where the seal plate is inserted in a state of being deviated in the axial direction of the bearing. Further, the sealing protruding piece is inserted and adhered to the inner peripheral surface or the step portion of the outer ring, so that the airtight contact area between the sealing plate and the outer ring increases, and the sealing performance of the sealing plate is greatly improved. . As a result, even when the bearing is operated at a high temperature, it is possible to effectively prevent the internal lubricating grease from oozing out through the locking groove.

[0047]

Further, in the bearing seal plate of the present invention , the inner peripheral surface of the outer race and the inner and outer surfaces of the locking groove are barrel-polished to reduce the surface roughness. The outer peripheral edge of the seal plate and the inner side surface and the outer side surface of the locking groove are more securely brought into close contact with each other, and the sealing performance is further improved.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a bearing in which a seal plate according to a first embodiment of the present invention is inserted.

FIG. 2 is an enlarged sectional view of a seal plate.

FIG. 3 is an enlarged sectional view of a main part of the seal plate.

FIG. 4 is a partially enlarged cross-sectional view of a bearing with a seal plate inserted therein according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of the seal plate in FIG. 4;

FIG. 6 is a partially enlarged sectional view of a bearing having a seal plate according to a third embodiment of the present invention inserted therein.

FIG. 7 is an enlarged sectional view of the seal plate in FIG. 6;

FIG. 8 is a partially broken enlarged side view of a conventional seal plate for a bearing.

FIG. 9 is a partially enlarged sectional view of a bearing in which a conventional seal plate is inserted.

[Explanation of symbols]

1 is a sealing plate, 1a is a projection, 1c is a sealing projection, 1
d is a biting surface, 1f is a biting surface, 2 is an outer ring, 2 'is a locking groove, 2a is an inner peripheral surface of an outer ring, 2b is an inner surface of a locking groove,
2c is the bottom surface of the locking groove, 2d is the outer surface of the locking groove, 2e is the step of the outer ring, 2f is the edge of the outer ring, 2g is the edge of the outer ring, and φ is the axis of the bearing.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 33/78

Claims (3)

(57) [Claims] 1. A cross-sectional shape consisting of both end portions in the formed inner surface and (2b) a bottom (2c) inclined outwardly opening shape and outer surface and (2d) of the outer ring (2) the inner peripheral surface of (2a) is The outer peripheral edge is inserted into the substantially U-shaped annular locking groove (2 ') so as to elastically contact the inner surface ( 2b ) and the outer surface (2d) of the locking groove (2'). in plastic annular bearing seal plate (1) with the elastic force, the
A locking groove (2 ') is formed on the outer surface of the outer peripheral edge of the seal plate (1 ).
Annular edge portion (2f) formed at the boundary between the outer surface (2d) of the outer ring (2d) and the inner peripheral surface (2a) of the outer ring (2) connected thereto.
Inclined bite plane bites the (1d), also Sea
The inner surface of the outer peripheral edge of the metal plate (1) has a locking groove (2 ').
The cross-sectional shape of the top surface in close contact with the side surface (2b)
Each of the substantially trapezoidal projections (1a) is formed in an annular shape, and
The inner surface of the seal plate (1) on the inner peripheral edge side of the protrusion (1a)
The sealing projection (1c) projecting in the direction
Formed locking grooves sealing plates to (2 ') in the time of loading of (1), food <br/> narrowing have a surface provided on the outer surface of the outer peripheral edge of the sealing plate (1) (1d) A protrusion provided on the inner surface of the outer peripheral edge of the seal plate (1), while the edge (2f) is cut into
The top surface of (1a) is brought into close contact with the inner side surface (2b) of the locking groove (2 ') in a state of surface contact, and the sealing protruding piece (1c) is further provided.
Of the outer ring (2) to the inner peripheral surface (2a) of the outer ring (2).
With this configuration, the sealing performance of the sealing plate (1) is improved.
A seal plate for a bearing, characterized in that: 2. An annular step (2e) is formed at the boundary between the inner surface (2b) of the locking groove (2 ') and the inner peripheral surface (2a) of the outer ring (2) connected thereto. 請 you to inserted sealing protruding piece (1c) adhesion shape to the stepped portions (2e) in
The seal plate for a bearing according to claim 1 . 3. The inner peripheral surface (2a) of the outer ring (2) and the inner surface (2b) and the outer surface (2d) of the locking groove (2 ') are barrel-polished to reduce the surface roughness . The seal plate for a bearing according to claim 1, wherein: