JP2000274442A - Sealed rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent plate rotation of a sealing plate by actively generating unbalance of frictional resistance on the engaging circumference at the engaging time of the sealing plate by engaging the sealing plate with an outer race plate groove having an ellipse in the radial direction or an outer race plate groove having waviness or an inclination in the shaft direction to an outer race end surface. SOLUTION: In a sealed rolling bearing by interposing a large number of rolling bodies 12 held by a cage 13 between an outer ring 1 and an inner ring 11, a sealing plate (a rubber seal or a plastic seal having core metal 10) 8 having an outside diameter part 9 of a true circle is installed by locking fastening in a plate groove 3 of the outer ring 1 having an ellipse in the radial direction. According to this, since the plate groove 3 is formed in an elliptic shape, large stress is generated according to an increase in a locking margin over the circumference toward a part A from a part B, so that when setting stress when installing the sealing plate 8 on the outer ring 1 equal to stress of the part B, a large sealing plate force removing valve can be obtained. An excellent plate rotation preventive effect can also be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed rolling bearing having a sealing plate engaged with an outer ring plate groove.

[0002]

2. Description of the Related Art Conventionally, in a sealed rolling bearing in which a sealing plate (seal, shield) is engaged (locked or caulked) with an outer ring plate groove, an outer ring plate groove 1 formed into a perfect circle is used.
00, the sealing plate 20 whose outer diameter portion 201 is processed into a perfect circular shape.
0 was engaged. 7 to 15 show a conventional technique.

[0003]

However, the outer race plate groove 10
When a sealing plate 200 whose outer diameter portion 201 is a perfect circular shape is attached (locked or swaged) to a shape where 0 is a perfect circle, both are macroscopically identical, so that they are fitted. The outer diameter portion (engaging portion) 201 of the sealing plate 200 follows the outer ring plate groove 100 while undergoing elastic deformation or plastic deformation, and has a perfect circular shape similar to the plate groove 100 (see FIGS. 7 to 15).

[0004] This is because even if the outer diameter portion 20 of the sealing plate 200
Even if a member having an elliptical shape 1 is mounted, the outer diameter portion (engaging portion) 201 follows the plate groove 100 in a mounted state because the shape is macroscopically the same.

[0005] Under such circumstances, the frictional resistance (elastic resistance, dimension allowance) of the engaging portion (the engaging portion between the plate groove and the sealing plate) is increased around the circumference of the plate. It is almost uniform,
The board was easily turned.

More specifically, for example, FIG.
A sealing plate (rubber seal or plastic seal) 200 having a groove is attached to the outer ring plate groove 100 by locking. The plate groove 100 has a perfect circular shape, and the outer diameter part 201 of the sealing plate 200 has a similar perfect circular shape. Therefore, stress was uniformly generated over the circumference of the plate groove 100, and the plate was easily turned.

FIGS. 11 and 12 show a sealing plate (shield) 200 having a perfect circular outer diameter portion 201 shown in FIG.
Are engaged or crimped in the outer ring plate groove 100 having the same circular shape, but the stress caused by the engaging or crimping is substantially uniformly generated in the notches 203 as shown in FIG. Or, as shown in FIG. 12, the curls 204 were formed almost uniformly over the circumference of the plate groove 100 and were easily turned around the plate.

Further, FIG. 14 shows that a sealing plate (shield) 200 having a polygonal outer diameter portion 201 shown in FIG. 13 is attached to a perfectly circular outer ring plate groove 100 by fastening or crimping. Since it has the same shape macroscopically, it has the same shape as the plate groove 100 at the time of mounting, and the stress caused by the engaging or crimping is notched as shown in FIG.
.. Occurred almost uniformly, and it was easy to turn around the board.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reduce friction on the engagement circumference when the sealing plate is engaged with the outer ring plate groove. An object of the present invention is to provide a sealed rolling bearing which positively generates an unbalance of resistance, and can easily and surely obtain a sealing plate detachment value and prevent the sealing plate from rotating around the plate.

[0010]

In order to solve the above-mentioned problems, a technical solution of the present invention is to engage a sealing plate with an outer race plate groove, wherein the outer race plate groove has a radially elliptical shape, or That is, it has undulation or inclination in the axial direction with respect to the outer ring end face.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Note that the present embodiment is for describing one embodiment of the present invention, and is not limited thereto. The sealing rolling provided by engaging the sealing plate with the outer ring plate groove is provided. If it is a bearing, a ball bearing, a roller bearing and the like are also within the scope of the present invention.

In FIG. 1, reference numeral 1 denotes a sealed rolling bearing, 2 denotes an outer ring, 8 denotes a sealing plate, 11 denotes an inner ring, 12 denotes a rolling element, and 13 denotes a cage. Although the description is omitted in the present invention, the inner ring 1
Other bearing components such as the rolling element 12 and the retainer 13 are not particularly limited to the illustrated examples, and can be appropriately changed to other well-known forms within the scope of the present invention.

The sealed rolling bearing 1 is mounted in a plate groove 3 provided in the outer ring 2 by engaging (clamping or caulking) an outer diameter portion 9 of a sealing plate 8.

The outer race 2 is formed with a plate groove 3 having a desired depth in the circumferential direction. The plate groove 3 has a structure having an ellipse in the radial direction, or has a structure with respect to the end face 4 of the outer race 2. A structure that gives an inclination and swell 5 in the axial direction is adopted.

It is also within the scope of the present invention that the plate groove 3 of the outer ring 2 has a radial ellipse, and the end surface 4 of the outer ring 2 has an axial inclination and swell 5.

It is to be noted that any structure having at least the above-described plate groove 3 is within the scope of the present invention, and other outer ring structures are optional. The ellipse in the radial direction, the inclination and the undulation in the axial direction may be extremely small.

In order to give the plate groove 3 of the outer ring 2 an elliptical or axial inclination and undulation 5 in the radial direction, deformation of the outer ring after turning is controlled by its own weight in heat treatment, or a load is intentionally applied to the outer ring. It becomes possible by giving. Further, the above-mentioned ellipse, inclination, and the like can be easily measured, such as by Roncom and Tarilond.

The ellipse is, for example, within the range of 0.15 to 60 μm when the outer diameter of the bearing is 20 or less, within the range of 0.15 to 100 μm when the outer diameter is 20 to 40 or less, and 0.15 to 200 μm when the outer diameter is 40 or more. (JIS radius method).

At least, if the plate groove 3 of the outer ring 2 has an elliptical shape in the radial direction or has an inclination or waviness in the axial direction with respect to the end surface of the outer ring, the sealing plate 8 has an outer diameter portion 9 having an elliptical shape. Or an approximately circular shape (substantially perfect circular shape), and the outer diameter portion 9 may be a polygon, and may have any outer diameter shape. Are also within the scope of the present invention.

The sealing plate 8 may be a seal such as a rubber seal or a plastic seal (which may be one having the core metal 10 or one not having the core metal), or a shield. It is not limited within the scope of the invention.

Accordingly, when an ellipse is given to the plate groove 3 of the outer ring 2 by such a configuration, a large compressive stress is generated in the engaging portion of the sealing plate 8 in the vicinity of the short-diameter portion 6. It is possible to obtain a larger de-force value and a plate turning prevention effect than engagement with a conventional outer ring having a perfect circular plate groove. In the figure, reference numeral 7 denotes a long diameter portion.

Further, in the plate groove 3 of the outer ring 2 having an ellipse,
By engaging the sealing plate 8 having an ellipse with the outer diameter portion 9, a large number of unbalanced portions of the frictional resistance on the engagement circumference are generated, and it is possible to obtain a further force-releasing value and a plate rotation preventing effect. Become.

The undulation or inclination is determined by, for example, the bearing outer diameter φ.
In the case of 20 or less, φ in the range of 0.15 to 60 μm
When the diameter is 20 to 40 or less, the diameter is in the range of 0.15 to 100 μm;

As described above, by giving the end surface (flat portion) 4 of the outer race 2 an inclination or undulation 5 in the axial direction, a large compressive stress is generated in the vicinity of the highest portion 5a and the deepest portion 5b of the inclination or undulation 5. As a result, it is possible to obtain a larger de-force value and a plate rotation preventing effect than engagement with a conventional outer ring having a perfect circular plate groove.

Further, a sealing plate 8 having an outer diameter portion 9 having an ellipse is engaged with a plate groove 3 of the outer ring 2 having an axially inclined or undulating surface 5 with respect to an end surface (flat portion) 4 of the outer ring 2. This makes it possible to obtain a large force-releasing value and a plate rotation preventing effect.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIGS. 1 and 2 show a first embodiment of a sealed rolling bearing 1 according to the present invention. A sealing plate (a rubber seal or a plastic seal having a metal core 10) 8 whose outer diameter portion 9 is a perfect circle is attached to the plate groove 3 of the outer ring 2 having an elliptical shape in a radial direction by locking.

According to the present embodiment, from the part B shown in FIG.
A large stress is generated due to the increase in the allowance over the circumference toward the part. Accordingly, if the stress when the sealing plate is attached to the outer ring having a perfect circular groove in the radial direction (in the case of the prior art) is set to the stress of the portion B, a large sealing plate (seal) force can be obtained. Becomes possible.

Further, according to the present embodiment, a large stress is generated as the interference of the sealing plate 8 increases from the part B to the part A in the circumference. Accordingly, when the engagement allowance in the case where the sealing plate is attached to the outer race having a plate groove having a perfect circular shape in the radial direction (in the case of the related art) = the engagement allowance of the portion B,
It is possible to obtain a large circumferential mounting force (plate turning force) over the circumference toward section A.

"Second Embodiment" FIGS. 3 to 5 show a second embodiment of the present invention, which specifically describes the sealed rolling bearing 1. FIG.
A sealing plate (shield) 8 having a polygonal outer diameter portion 9 is attached to the plate groove 3 of the outer ring 2 having a radially elliptical shape by caulking or engaging.

According to the present embodiment, the stress caused by caulking or engaging is determined by the notch C, D, and E relative to the portion C.
D part> E part is balanced. Thereby, when the stress uniformly applied to the outer ring plate groove in the radial direction (in the case of the prior art) is set to the E portion, a large stress is obtained in the C portion and the D portion. Therefore, it is possible to obtain a large sealing plate (shield) weakness value.

Furthermore, when the outer ring 2 having a radially elliptical shape is crimped or engaged with the plate groove 3, the outer diameter of the sealing plate (shield) 8 after crimping or engaging is F>G> H.
Becomes Accordingly, when the outer dimensions of the sealing plate (which is uniform over the entire outer diameter) = F when mounted on the outer ring plate groove having a perfect circular shape in the radial direction (in the case of the prior art), H, H
In G, a large mounting force (plate turning force) in the circumferential direction of the sealing plate (shield) is obtained, and a large plate turning value can be obtained.

[Third Embodiment] FIG. 6 shows a third embodiment of the present invention, which specifically describes the sealed rolling bearing 1 of the present invention. A sealing plate (shield) 8 is attached by crimping to the plate groove 3 of the outer ring 2 having a swell (inclination) 5 around the circumference.

According to this embodiment, the sealing plate (shield) 8
The outer diameter portion 9 is mounted following the plate groove 3. This allows
A large stress is generated at the highest portion 5a and the deepest portion 5b of the undulation 5, so that a large sealing plate (shield) force can be obtained.

Further, with respect to the periphery of the plate, since the outer diameter portion 9 of the sealing plate (shield) 8 after being attached is elastically deformed in accordance with the undulation 5 of the plate groove 3, the highest portion 5a of the undulation 5 is formed. A large circumferential mounting force can be obtained by the wedge effect of the deepest portion 5b.

[0035]

The present invention is constructed as described above, and positively generates an imbalance in frictional resistance on the engagement circumference when the sealing plate is engaged with the outer ring plate groove. A rolling bearing having a sufficient plate release force and preventing the sealing plate from rotating around the plate can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG.
FIG. 2 is a longitudinal sectional side view of the sealing plate, in which FIG.

FIG. 2 is a partially omitted front view showing a state in which a sealing plate is attached to an outer race plate groove.

FIG. 3 is a front view of a sealing plate having a polygonal outer diameter portion.

FIG. 4 is a partially omitted front view showing the relationship between the sealing plate and the outer race plate groove shown in FIG. 4;

FIG. 5 is a partially omitted front view showing a state where the sealing plate shown in FIG. 4 is attached to an outer race plate groove.

FIGS. 6A and 6B are schematic views showing a state in which a sealing plate is attached to an outer ring plate groove having undulation on the circumference, wherein FIG. 6A shows a state before crimping and FIG.

FIG. 7 is a partially omitted longitudinal sectional view of a sealed rolling bearing showing a conventional technique.

8A and 8B show a conventional technique, in which FIG. 8A shows an outer race plate groove and FIG. 8B shows a sealing plate.

9A and 9B show a prior art, in which FIG. 9A is a partially omitted front view showing a state in which a sealing plate having a perfect circular outer diameter portion is attached to an outer ring having a perfect circular plate groove, and FIG. FIG. 4 is a longitudinal side view of a sealing plate having a circular outer diameter portion.

FIG. 10 is a front view of a sealing plate having a perfect circular outer diameter portion.

FIG. 11 is a partially omitted front view showing a state in which the sealing plate shown in FIG. 10 is mounted in a perfectly circular outer ring plate groove.

FIG. 12 is a partially omitted front view showing a state where the sealing plate shown in FIG. 10 is mounted in a perfect circular outer ring plate groove.

FIG. 13 is a front view of a sealing plate having a perfect circular outer diameter portion.

FIG. 14 is a partially omitted front view showing a state in which the sealing plate shown in FIG. 13 is attached to a perfect circular outer ring plate groove.

FIG. 15 is a schematic view showing a part of the related art by omitting it.
(A) shows before crimping and (b) shows after crimping.

[Explanation of symbols]

 1: outer ring 3: plate groove 8: sealing plate 9: outer diameter portion 11: inner ring 12: rolling element 13: retainer

Claims (1)

[Claims] 1. A sealing plate is engaged with an outer ring plate groove, and the plate groove has an elliptical shape in a radial direction, or has an undulation or inclination in an axial direction with respect to an end surface of the outer ring. Sealed rolling bearing.