JPH0516411Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> This invention relates to a sealed rolling bearing.

<Prior art> Recently, there has been a strong demand for high precision outer ring roundness in sealed rolling bearings.
In the case of small sealed rolling bearings, the amount of deformation of the outer ring is required to have an accuracy of 1/1000 mm or less.

However, in conventional sealed rolling bearings, as shown in FIG. 4, external pressure is applied to the peripheral bent portion 1a of the seal plate 1 made of mild steel using a jig 2 to cause it to elastically deform, thereby forming the circumferential groove 4 of the outer ring 3. It is attached to.
Therefore, tensile force is generated from the peripheral bent portion 1a of the seal plate 1 to the outer ring 3. Since this tensile force acts in the normal direction to the inclined surface 6 formed in the circumferential groove 4 of the outer ring 3, deformation occurs in the raceway part 8 and the outer diameter part 9 of the outer ring 3. For this reason, there is a problem that the roundness of the outer ring 3 cannot be maintained with high precision as described above.

<Purpose of the invention> Therefore, the purpose of this invention is to prevent deformation of the outer diameter portion and raceway by acting in the axial direction of the outer ring when the peripheral bent portion of the seal plate is installed in the circumferential groove of the outer ring. The objective is to improve the roundness of the outer ring.

<Structure of the invention> In order to achieve the above object, the structure of this invention is such that a peripheral bent part of a metal seal plate is attached to the circumferential groove of the outer ring, and the grease is surrounded by the outer ring, the inner ring, and the seal plate. In a sealed rolling bearing that is sealed in a region where rolling elements are present, the outer ring has a circumferential groove and an inner circumferential surface of the circumferential groove is formed so as to curve outward, and the seal plate has a gap on the outside in the radial direction. A peripheral projection is formed at the end of the outer ring to press the peripheral bent portion of the seal plate toward the inner side in a substantially axial direction of the outer ring, and a peripheral projection is formed inside the peripheral projection. The direction of the pressing surface is oriented at 15 degrees to 30 degrees with respect to the direction perpendicular to the axis of the outer ring, and the outer peripheral surface of the outer ring is provided with a chamfered portion starting from at least the center position of the circumferential groove. It is characterized by becoming.

<Example> This invention will be explained in detail below with reference to the illustrated example.

In FIG. 2, 21 is an outer ring, 22 is a wide ring-shaped seal plate made of mild steel, 31 is an inner ring, and 32 is a plurality of seal plates arranged at predetermined intervals in the circumferential direction between the outer ring 21 and the inner ring 31. A ball is an example of a rolling element.

As shown in FIGS. 1 and 3, at both ends 21a, 21a of the outer ring 21, an inner circumferential surface 24 curved toward the outside and an inner surface 2 of a peripheral protrusion 25 connected thereto.
5a forms a circumferential groove 26. Above peripheral protrusion 2
The inner surface 25a of the outer ring 21 is inclined by α (15 degrees≦α≦30 degrees) with respect to the direction perpendicular to the axial direction of the outer ring 21.
This is because when α is less than 15 degrees, the seal plate 22 cannot be fixed in the radial direction. Also, α
If the angle exceeds 30 degrees, the direction of the force pushing the peripheral protrusion 25 of the plate 22 will be radially directed, making it impossible to achieve the object of the present invention. The outer diameter of the circumferential groove 26 is larger than the outer diameter of the seal plate 22. Also, the outer peripheral surface 21 of the outer ring 21
A rounded chamfer 29 starting from the inside of the center line A of the circumferential groove 26 is formed in b. on the other hand,
The seal plate 22 has a curled peripheral bent portion 22b at the tip of its outer peripheral portion 22a. Further, the width of the circumferential groove 26 in the inward direction is slightly smaller than the width of the circumferential bent portion 22b of the seal plate 22 in the thickness direction.

Then, the circumferential bent portion 22b of the seal plate 22 is pressed with a jig 35 having an approximately 40-degree inclined surface 35a on the front surface of the circumferential groove 26 of the outer ring 21, thereby elastically deforming the seal plate 22 and converting the outer circumferential portion 22a into the outer ring. 2
1, and the corner 22c of the peripheral bent portion 22b is brought into close contact with the inner surface 25a of the peripheral protrusion 25. In this way, with the gap 40 formed in the circumferential groove 26 of the outer ring 21 on the outside in the radial direction, the circumferential bent portion 22b of the seal plate 22 is connected to the inclined surface 25a of the peripheral protrusion 25 and the end 2 of the outer ring 21.
1c and are sandwiched and fixed in the axial direction. Therefore, the peripheral bent portion 22b of the seal plate 22 generates a bending moment that bends the peripheral protrusion 25 outward, but the outer peripheral surface 21b of the outer ring 21
Since a substantially rounded chamfered portion 29 starting from inside the center line A of the circumferential groove 26 is formed in the outer ring end portion 21a, the distortion occurring in the outer ring end portion 21a due to the bending moment is absorbed by the chamfered portion 29, and the outer circumferential surface 21b does not increase in size. In other words, the roundness of the outer diameter of the outer ring 21 does not change before and after the peripheral bent portion 22b of the seal plate 22 is attached to the circumferential groove 26 of the outer ring 21, and good roundness is maintained. . Further, since the force in the direction indicated by the arrow X from the peripheral bent portion 22b is substantially axial, it hardly affects the inner diameter dimension of the outer ring 21. Further, since the gap 40 exists between the peripheral bent portion 22b and the inner peripheral surface 24, no force is applied to the outer ring 21 in the radial direction, and the end 21c of the outer ring 21 and the raceway surface 30 do not change. .

In the above embodiment, the chamfered portion 29 has a substantially rounded shape, but it may also have a planar shape.

<Effects of the invention> As is clear from the above explanation, in the sealed rolling bearing of this invention, the inner circumferential surface of the outer ring curves outward as the inner circumferential surface of the circumferential groove faces outward, leaving a gap in the radial direction of the seal plate. A peripheral protrusion is formed at the end of the outer ring to press the peripheral bent part of the seal plate inward in the approximately axial direction of the outer ring, and the direction of the pressing surface of the peripheral protrusion is set as above. While forming an angle of 15 degrees to 30 degrees with respect to the direction perpendicular to the axis of the outer ring,
A chamfered portion starting from at least the center position of the circumferential groove is formed on the outer circumferential surface of the outer ring.

Therefore, according to this invention, when the peripheral bent portion of the seal plate is elastically deformed and installed in the peripheral groove of the outer ring, a gap is created on the radially outer side of the seal plate, and the peripheral protrusion is pushed approximately in the axial direction, causing the radial Changes in the inner and outer diameters of the outer ring can be prevented without applying any directional force. In addition, the force that pushes the peripheral protrusion in the axial direction generates a bending moment that bends it outward, but the bending moment causes deformation in the chamfered part of the outer circumferential surface of the outer ring, so that the outer diameter size can be prevented from increasing. As a result, deformation of the raceway and the outer ring can be prevented and the roundness of the outer ring can be maintained with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a local sectional view showing an embodiment of this invention.
FIG. 2 is an overall sectional view of the above embodiment, FIG. 3 is a sectional view of the outer ring of the above embodiment, and FIG. 4 is a partial sectional view of a conventional example. 21...Outer ring, 21a...End, 21b...Outer peripheral surface, 22...Seal plate, 22b...Peripheral bent portion, 25...Peripheral projection, 26...Peripheral groove, 29
... Chamfered portion, 31 ... Inner ring, 32 ... Rolling element,
40...Gap.

Claims (1)

[Claims for Utility Model Registration] A sealed type roller in which a peripheral bent portion of a metal seal plate is attached to a circumferential groove of an outer ring to seal grease into an area surrounded by the outer ring, inner ring, and seal plate where the rolling elements exist. In the bearing, the circumferential groove of the outer ring is formed such that an inner circumferential surface of the circumferential groove is curved outward, and has a shape that accommodates the seal plate with a gap radially outward. A peripheral protrusion is formed at the end of the outer ring to press the peripheral bent part of the seal plate inward in a substantially axial direction of the outer ring, and the direction of the pressing surface formed inside the peripheral protrusion is The chamfer is formed at an angle of 15 degrees to 30 degrees with respect to the direction perpendicular to the axis of the outer ring, and the outer circumferential surface of the outer ring is formed with a chamfered portion that starts from at least the center position of the circumferential groove. Sealed rolling bearing.