JPH0337415A - Bearing and seal plate - Google Patents

Abstract

PURPOSE:To improve sealing property and assembling property by forming a guide surface having a diameter gradually reduced from the outer wheel side end to the inner part and a fitting channel in the back end thereof, and forming fitting flanges to be fitted into the fitting channel on the vertical both ends of a synthetic resin seal plate. CONSTITUTION:When a seal plate 40 is pushed in contact with the side part of a bearing 10, the fitting part 41 of the seal plate 41 is fitted to the inside of a guide surface 22 as the diameter of one fitting flange 42 situated on the most outside circumference is smaller than the diameter of the side end 21 side end of the guide surface 22 of an outer wheel 20. When the seal plate 40 is further pushed, the fitting flange 42 at the top is guided by the guide surface 22 and advanced toward the inner part with being elastically deformed, fitted to a fitting channel 23 on the deep end, and stopped. The outside fitting flange 42 is made close to or in contact with the guide surface 22. A cover face part 45 is extended to an inner wheel 30, and its top end clogs the side part of a bearing body 15 through a minute cavity space (s). Hence, a strong sealing performance and a sealing performance never changed even if the both sides are reversed are obtained.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a bearing comprising a rolling body such as a ball or roller interposed between an outer ring and an inner ring, and a bearing for blocking the sides of the bearing. Regarding seal plates.

"Prior Art" As a conventional bearing and seal plate, there is one disclosed in, for example, Japanese Utility Model Publication No. 12906/1983.

That is, the publication discloses a technology related to a seal plate suitable for ultra-small sealed type bearings, and the content thereof is that the seal plate is molded from a thin plate made of elastic synthetic resin. A symmetrical trapezoidal protrusion is formed on the outer periphery of the seal plate, and the inclined surface of the protrusion is fixed to the insertion groove of the outer ring of the bearing.

"Problem to be solved by the invention" However, such conventional technology simply attaches and fixes the inclined surface of the protruding part of the seal plate to the insertion groove of the outer ring of the bearing, and the seal at the outer periphery is made of a thin plate. However, the sealing force may not be sufficient because the outer edge of the seal plate fits into the insertion groove. Since it is designed to deform when it comes into contact with the seal plate, there is a risk of unreasonable deformation of the seal plate.

The present invention has been made in view of these conventional problems, and an object of the present invention is to provide a bearing and a seal plate that have good sealing performance and improved workability when assembling.

"Means for Solving the Problems" The gist of the present invention, which is distantly related to the above object, is as follows: l In a bearing in which a rolling body is interposed between an outer ring and an inner ring, the side of the outer ring A guide surface whose diameter gradually decreases from the end to the inside is formed, and a fitting groove that indents toward the outside diameter is formed at the inner end of the guide surface, and an elastic synthetic resin seal plate is inserted into the fitting groove. The seal plate is installed to fit into the fitting groove and close the side of the bearing body, and the seal plate includes a fitting part having a fitting flange that is guided by the guide surface of the outer ring and fits into the fitting groove; and a cover surface portion extending from the mating portion in the direction of the center line of the bearing, and the mating portion has the mating flanges on both ends in the thickness direction, and is symmetrical in the thickness direction and is open in the radial direction. The fitting flanges have a groove-shaped cross section, and each of the fitting flanges is smaller than the diameter of the side end of the guide surface of the outer ring and larger than the diameter of the rear end, so that either of the fitting flanges can be fitted into the fitting groove of the outer ring. A bearing characterized by forming.

2. Item 1, characterized in that a loose fitting groove is formed by invading the outer peripheral surface of the side end of the inner ring toward the center, and the inner circumferential edge of the cover surface portion is loosely fitted into the loose fitting groove. bearings.

3. A seal plate inserted to close the side of the bearing, the seal plate being made of elastic synthetic resin and having a fitting part having a fitting flange that fits into a fitting groove formed in the outer ring of the bearing. , and a cover surface portion extending from the fitting portion in the direction of the center line of the bearing, the fitting portion being open outward and symmetrical with respect to the center line in the thickness direction, both of which are aligned with the outer ring. The seal plate is characterized in that the fitting flange is formed in a groove-shaped cross section on both sides so as to fit into the fitting groove.

"Operation" To attach the seal plate to the bearing body, place the seal plate against the side of the bearing and push it in. Since the diameter of the fitting flange is smaller than the diameter of the side edge of the guide surface of the outer ring, the seal plate The fitting part on the outer periphery fits inside the guide surface.

If you push the seal plate in as it is, the leading mating flange will be guided by the guide surface, and the seal plate will elastically deform and move towards the back, and when it is pushed in enough, the mating flange will fit into the back end of the guide surface. It fits into the matching groove and stops.

When the fitting flange is securely fitted into the fitting groove of the outer ring, there is almost no elastic deformation of the seal plate, and the outer fitting flange that is not fitted into the fitting groove approaches or contacts the guide surface. The cover surface extends to the inner ring and the side of the bearing body is closed, completing the installation of the seal plate.

The fitting part of the seal plate is symmetrical in the thickness direction, so even if it is installed face down or reversed, it will fit into the fitting flange or fitting groove on the advancing side, so there will be no difficulty in assembling it. There isn't.

When the seal plate is inserted into the loose fitting groove of the inner ring, the inner periphery of the cover surface hits the inner ring and is deformed, and then it is pushed forward into the fitting flange or the fitting groove of the outer ring. When fitted, the inner peripheral edge of the cover surface part also fits into the loose fitting groove of the inner ring.

In a bearing equipped with a seal plate, dust that tries to enter from the side of the bearing is blocked by the outer fitting flange that does not fit into the fitting groove of the outer ring, and the part of the groove in the fitting part is roughly blocked. Then, it reaches the inner fitting flange, where the fitting flange or fitting groove fits into the fitting groove and is strongly protected from dust.

When the inner circumferential edge of the cover surface part is fitted into the loose fitting groove of the inner ring, dust trying to enter must bend through the gap between the loose fitting groove and the inner circumferential edge of the cover surface part. The sides are also prevented from entering dust, and the bearings are kept clean.

"Example" Hereinafter, various embodiments of the present invention will be described based on the drawings.

1 and 2 show a first embodiment of the invention.

The bearing 10 is constructed by interposing a ball 11 as a rolling body between a bearing body 15 or an outer ring 20 and an inner ring 30, and a seal plate 40 is attached to close the side of the bearing body 15. The center of the inner ring 30 forms a shaft hole 31 that supports a rotating shaft (not shown). Note that it is common to have a retainer for holding the balls 11, but this is not shown.

A guide surface 22 whose diameter gradually decreases from the side end 21 toward the inside is formed on the inner surface of the outer ring 20. Guide surface 2
A fitting groove 23 is formed at the rear end of the groove 2 so as to recess toward the outer diameter side.

The seal plate 40 is in the form of a link disk made of synthetic resin and has elasticity to the extent that it does not cause problematic distortion in the bearing body 15, and its outer periphery is fitted into the fitting groove 23 of the outer ring 2o, and the seal plate 40 is attached to the side of the bearing body 15. It is attached to cover the area.

As the synthetic resin, a wide variety of materials can be used, such as polyurethane, polypropylene, polyamide, etc., which have heat resistance, oil resistance, and other attributes depending on the conditions of use.

The outer peripheral portion of the seal plate 40 has a fitting flange 42.42 that is guided by the guide surface 22 of the outer ring 20 and fitted into the fitting groove 23.
A cover surface portion 45 is formed to extend from the fitting portion 41 in the direction of the center line of the bearing 10 .

The fitting part 41 has a groove-shaped cross section that opens in the radial direction, and fitting flanges 42 and 42 are formed at both ends in the thickness direction, and are formed symmetrically in the thickness direction.

Both fitting flanges 42.42 of the fitting part 41 are smaller than the diameter of the end of the guide surface 22 of the side end 21 of the outer ring 20 and larger than the diameter of the inner end. It is formed so that it can fit into the fitting groove 23 of.

When one fitting flange 42 is fitted into the fitting groove 23 of the outer ring 20, the other fitting flange 42 is either slightly in contact with the guide surface 22 or is in contact with the guide surface 22 with a slight gap.
is coming.

In this embodiment, the cover surface portion 45 has the same thickness as the fitting portion 41 and has a symmetrical shape in the thickness direction, and is similar to the outer circumferential surface 3 of the inner ring 30.
2, and extends from the tip 46 to the outer peripheral surface 32 through a small gap S.
is coming.

Next, the effect will be explained.

To attach the seal plate 40 to the bearing body 15, place the seal plate 40 against the side of the bearing 10 and push it in. The diameter of one fitting flange on the outermost periphery matches the side edge of the guide surface 22 of the outer ring 20. The diameter of the seal plate 40 is smaller than the diameter of the 0 end on the 21 side.
1 or fit inside the guide surface 22.

Since the seal plate 40 is symmetrical as a whole, and especially the fitting portion 41 is symmetrical in shape, it is possible to convey the seal plate 40 without distinguishing between the front and the back when it is fed by a parts tweeter or the like.

If the seal plate 40 is pushed in as it is, it will be guided by the leading fitting flange 42 or the guide surface 22, and the seal plate 40 will advance to the back while being elastically deformed, and when it is pushed in enough, the leading side will be fitted. The flange 42 returns due to elastic force, fits into the fitting groove 23 at the rear end of the guide surface 22, and stops.

When the fitting flange 42 is securely fitted into the fitting groove 23 of the outer ring 20, the elastic deformation of the seal plate 40 is almost completely eliminated, and the outer fitting flange 42 that is not fitted into the fitting groove 23 is removed.
．． 42 is close to or in contact with the guide surface 22.

The cover surface part 45 extends to the inner ring 30 so as to occupy the space between the outer ring 20 and the inner ring 30, and its tip faces the outer circumferential surface 32 through a small gap S and closes the side of the bearing body 15. There is.

This completes the attachment of the seal plate 40.

Since the fitting portion 41 and the cover surface portion 45 of the seal plate 40 are symmetrical in the thickness direction, the fitting flange 42, 42 or the fitting groove 23 will be on the advancing side even if the seal plate 40 is installed front and back or reversed.
There is no problem with assembly as it fits perfectly.

The bearing 10 is used by inserting and supporting a rotating shaft (not shown) into a shaft hole 31 of an inner ring 30. When the rotating shaft rotates, the inner ring 30 rotates relative to the outer ring 20, and the balls 11
or roll over to ease the resistance.

Dust that tries to enter from the side of the bearing 10 is blocked by the outer fitting flange 42 that does not fit into the fitting groove 23 of the outer ring 20, and roughly passes through the groove of the fitting part 41 and enters the inner side. This leads to the fitting flange 42, where the fitting flange 42 is fitted into the fitting groove 23 and is strongly controlled to prevent dust from entering.

3 and 4 show a second embodiment. In this embodiment, the structure of the outer ring 20 of the bearing body 15 and the fitting part 41 of the seal plate 40 is the same as in the first embodiment, so similar parts are given the same reference numerals and only the characteristic structure will be explained. .

In this embodiment, a thin cover surface portion 45a is formed from the fitting portion 41 of the seal plate 40 via the tapered portion 47. In addition, a loose fitting groove 34 is formed by recessing from the outer circumferential surface 32 of the side end 33 of the inner ring 30 toward the center, and the cover surface portion 4
The inner peripheral edge 48 of 5a is loosely fitted into the loose fitting groove 34.

To assemble the seal plate 40, the fitting part 41 is the same as in the first embodiment, and when the seal plate 40 is pushed in, the inner peripheral edge 48 of the cover surface part 45a hits the inner ring 30 and is pushed forward while being deformed. Fitting flange 4 of fitting part 41
2 is fitted into the fitting groove 23 of the outer ring 20, the inner circumferential edge 48 of the cover surface portion 45a also returns with elasticity and fits into the loose fitting groove 34 of the inner ring 30.

Dust trying to enter from the inner circumferential side of the seal plate 40 has to bend through the gap between the loose fitting groove 34 and the inner circumferential edge 3 48 of the cover surface portion 45a, so it is difficult to prevent dust from entering even from the center side. The bearing 10 is kept clean.

FIGS. 5 and 6 show a third embodiment.

This embodiment is a modification of the second embodiment, in which a cover surface portion 45b is formed to extend directly from the fitting portion 41 without providing a tapered portion. In this way, the form of assembly can be changed as appropriate depending on the object. For example, the cover surface portion may be made gradually thinner toward the inner peripheral edge of the meng.

FIGS. 7 and 8 show a fourth embodiment.

In this embodiment, while the aforementioned embodiments are symmetrical in the thickness direction as a whole, the cover surface portion is asymmetrical.

That is, is the fitting part 41 the same as in each of the above embodiments?
A thin plate-shaped cover surface portion 45c is extended along the side of the hair ring body 15, and bent toward the center in the thickness direction at the tip to form an inner peripheral edge 48a oriented toward the center in the radial direction.

In the inner ring 30, a loose fit groove 34a is formed, which is enlarged in diameter with respect to the center of the outer circumferential surface 32a of the side end portion 33, and is recessed toward the center at the inner end of the outer circumferential surface 32a. The inner surface forms a sealing surface 35 that faces the inner peripheral edge 48a of the cover surface portion 45.

In this embodiment, the sealing surface 35 and the inner circumferential edge 48a of the cover surface portion 45 face each other over a large area, which has the advantage that the sealing performance at the center portion is the same.

"Effects of the Invention" According to the bearing and seal plate according to the present invention, when forming the seal plate made of synthetic resin that has an elasticity that does not cause problematic distortion in the bearing body, it is possible to Strong sealing performance can be obtained by providing a fitting part with a groove-shaped cross section that is symmetrical in the thickness direction of the opening, and sealing the outer periphery with fitting flanges provided at both ends of the fitting part. It is possible to obtain sealing performance that does not change even if the surface is turned upside down or reversed.

5. If the inner ring is provided with a loose fitting groove so that the inner circumferential edge of the cover surface part is loosely fitted, the sealing performance on the center side is also improved.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of the bearing, FIG. 2 is a front view with a part of the seal plate cut away, and FIG. 3 and 4 show the second embodiment, FIG. 3 is a vertical sectional view of the bearing, and FIG.
The figure is a partially cutaway front view of the seal plate, Figures 5 and 6 show the third embodiment, Figure 5 is a longitudinal sectional view of the bearing, and Figure 6 is a part of the seal plate. 7 and 8 show the fourth embodiment, FIG. 7 is a vertical sectional view of the bearing, and FIG. 8 is a front view showing a part of the seal plate cut away. It is a diagram. 10... Bearing 11... Ball 15.
... Bearing body 20 ... Outer ring 22 ... Guide surface 23 ... Fitting groove 30 ... Inner ring
31...Shaft hole 32...Outer peripheral surface
34... Loose fitting groove 6 35... Seal surface 40... Seal plate 41
... Fitting part 42.42 ... Fitting flange 45.45a-C ... Cover surface part 46 ... Tip 47 ... Taper part 48
...Inner peripheral edge 7

Claims (1)

[Scope of Claims] 1. A bearing in which a rolling body is interposed between an outer ring and an inner ring, in which a guide surface whose diameter gradually decreases from the side end of the outer ring toward the inside is formed, and the guide surface A fitting groove is formed at the rear end to recess toward the outer diameter side, and a sealing plate made of an elastic synthetic resin is fitted to fit into the fitting groove to close the side of the bearing body, and the sealing plate The fitting portion includes a fitting portion having a fitting flange that is guided by the guide surface of the outer ring and fitted into the fitting groove, and a cover surface portion extending from the fitting portion in the direction of the center line of the bearing. , each having the fitting flanges on both ends in the thickness direction, each having a groove-shaped cross section that is symmetrical in the thickness direction and opened toward the radial direction, and the fitting flanges are located on the guide surface of the outer ring. A bearing characterized in that the diameter of the bearing is smaller than the diameter of the side end and larger than the diameter of the rear end, and either of the diameters is formed so that it can fit into the fitting groove of the outer ring. 2. Claim 1, characterized in that a loose fitting groove is formed by indenting from the outer circumferential surface of the side end of the inner ring toward the center, and the inner circumferential edge of the cover surface portion is loosely fitted into the loose fitting groove. Bearings listed. 3. A seal plate inserted to close the side of the bearing, wherein the seal plate is made of elastic synthetic resin and has a fitting part having a fitting flange that fits into a fitting groove formed in the outer ring of the bearing. , a cover surface portion extending from the fitting portion in the direction of the center line of the bearing, the fitting portion being open outward and symmetrical with respect to the center line in the thickness direction; A seal plate characterized in that the seal plate is formed in a groove-shaped cross section with the fitting flanges on both sides so as to fit into the fitting groove.