JP2023030912A - rolling bearing - Google Patents

Abstract

To prevent the generation of a crack caused by the attachment of a snap ring of a bearing ring, and to improve the rotation resistance of a protection member with respect to the bearing ring, in a rolling bearing in which the annular protection member is fixed to the bearing ring by the snap ring.SOLUTION: In an outside bearing ring (outer ring) 2, there are formed an abutment face 10 which opposes an external peripheral part 9 of a protection member 5 in an axial direction at an end part in the axial direction at an internal peripheral side, and a U-shaped attachment groove 11 having a shallow cross section U extending over an entire periphery in the vicinity of an end face. In a snap ring 6, notches 15 are formed at a plurality of points of an external peripheral part of its outside face in a circumferential direction, a caulking part 16 between the notches 15 and an external peripheral edge which approaches the notches 15 is attached to the outside bearing ring 2 by being caulked and fixed to the attachment groove 11 of the outside bearing ring 2, and the external peripheral part 9 of the protection member 5 is thereby pressed to the abutment face 10 of the outside bearing ring 2.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a rolling bearing capable of fixing an annular protective member such as a seal or shield to a bearing ring.

Rolling bearings are protected against water and foreign matter by fixing an annular protective member such as a seal or shield to the bearing ring, that is, the inner ring or the outer ring, and sealing or generally covering the inner space of the bearing between the inner and outer rings with the protective member. are often prevented from entering the space inside the bearing. Hereinafter, the direction along the central axis of a rolling bearing is referred to as the "axial direction," and the direction perpendicular to the central axis of the bearing is referred to as the "radial direction." The direction along is called "circumferential direction".

As this type of rolling bearing, there has been proposed a rolling bearing in which a protective member is fixed by a retaining ring fitted to the bearing ring (see, for example, Patent Document 1), and an example is shown in FIGS. This rolling bearing comprises an outer bearing ring (outer ring) 51, rolling elements 52 arranged on the inner peripheral side of the outer bearing ring 51, and an annular protective member 53, which are cut at one point in the circumferential direction. A wedge-shaped retaining ring 54 and an abutment surface 56 axially opposed to the outer peripheral portion 55 of the protective member 53 are provided at the axial end portion of the inner peripheral side of the outer bearing ring 51 . A ring groove 57 is formed, and the retaining ring 54 is fitted into the retaining ring groove 57 by reducing its diameter while the outer peripheral portion 55 of the protective member 53 is brought into contact with the contact surface 56 thereof from the axial direction. The protective member 53 is fixed by axially pressing the outer peripheral portion 55 of the protective member 53 with the contact surface 56 of the outer bearing ring 51 and the retaining ring 54 .

JP 2017-219129 A

However, the rolling bearing in which the protective member is fixed by the snap ring as described above has room for improvement in the following points. First, it is necessary to fit the retaining ring securely into the wedge-shaped retaining ring groove of the raceway so that it does not fall off. If it becomes large, there is a risk that cracks will occur due to stress concentration at the groove bottom of the retaining ring groove.

In addition, since the retaining ring groove has an inclined surface, complicated processing is required, and the portion where the inclined surface is formed has a large thickness difference, so it is easily affected by heat treatment deformation, etc., ensuring dimensional accuracy. hard to do. Due to variations in dimensional accuracy, the retaining ring pushed into the wedge shape of the retaining ring groove lacks the axial force that presses the protective member against the contact surface of the bearing ring, and when the bearing rotates, the protective member is removed from the bearing ring. may rotate relative to In particular, when the protective member is a contact seal that makes sliding contact with another bearing ring, there is a concern that seal torque will act on the protective member, causing the protective member to rotate together with the other bearing ring.

Furthermore, the bearing ring, the outer peripheral portion of the protective member, and the retaining ring are each made of metal, and the contact portions between the outer peripheral portion of the protective member and the bearing ring and retaining ring are in metal contact. When the force pressing against the bearing ring is reduced, there is a problem that the protective member is more likely to rotate together with other bearing rings.

Accordingly, in a rolling bearing in which an annular protective member is fixed to a bearing ring by a retaining ring, the present invention prevents the occurrence of cracks due to attachment of the retaining ring to the bearing ring, and also improves the rotational resistance of the protective member to the bearing ring. The task is to improve

In order to solve the above problems, the present invention provides an inner bearing ring, an outer bearing ring, a plurality of rolling elements interposed between the inner bearing ring and the outer bearing ring, a retainer that retains the rolling elements; a pair of protective members that seal an annular inner bearing space formed between the inner bearing ring and the outer bearing ring; The protective member has an outer peripheral side or an inner peripheral edge that abuts the bearing ring in the axial direction, and the bearing ring is axially attached to the peripheral edge of the protective member. and a mounting groove for mounting the retaining ring, wherein the retaining ring is cut at a plurality of locations in the circumferential direction on the outer peripheral side or the inner peripheral side of the outer surface. A notch is formed, and a crimping portion between the notch and a peripheral edge adjacent to the notch is crimped and fixed to the mounting groove of the bearing ring to attach the bearing ring to the bearing ring. A configuration is adopted in which the peripheral portion of the protective member is pressed against the contact surface of the bearing ring.

According to the above configuration, the fixing state of the crimped portion of the retaining ring to the bearing ring can be visually confirmed, so that the retaining ring can be reliably attached to the bearing ring. In addition, since the mounting groove of the bearing ring to which the caulked part of the retaining ring is fixed can be made much shallower than the conventional wedge-shaped retaining ring groove, stress concentration during mounting of the retaining ring can be suppressed. It is possible to prevent the occurrence of cracks. In addition, since the mounting groove of the bearing ring has a shallow and simple shape and the difference in the thickness of the surrounding portion can be reduced, the influence of heat treatment is small, and it is easy to ensure dimensional accuracy. In addition, by having a notch on the outer surface of the retaining ring, when fitting the retaining ring, it is possible to moderately elastically deform easily, thereby improving the mountability. Therefore, the protective member is more reliably pressed against the bearing ring by the retaining ring than in the conventional art, and the resistance to rotation of the protective member against the bearing ring can be improved.

Here, the conventional retaining ring as shown in FIG. 5 needs to have circumferential cuts for diameter reduction, but the retaining ring of the present invention is formed in an annular shape without any circumferential cuts. can be used. This is because there is no need to reduce the diameter when attaching to the bearing ring.

Further, a rubber portion is provided in at least one opposing region of the opposing region between the contact surface of the bearing ring and the peripheral edge portion of the protective member and the opposing region between the retaining ring and the peripheral edge portion of the protective member. By adopting the provided configuration, it is possible to further improve the resistance to rotation of the protection member with respect to the bearing ring. In this case, the rubber portion may be attached to the peripheral edge portion of the protective member, may be attached to the contact surface of the bearing ring, or may be attached to the retaining ring. good.

By adopting the above configuration, the present invention can prevent the occurrence of cracks due to attachment of the retaining ring to the bearing ring, and can improve the resistance to rotation of the protective member for the bearing ring. Further, when the protective member comes into sliding contact with another bearing ring, it is possible to prevent the protective member from rotating together with the other bearing ring due to the improved anti-rotation property of the protective member.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the rolling bearing which concerns on embodiment of this invention Enlarged view of the vicinity of the retaining ring in Fig. 1 FIG. 2 is an enlarged partial cross-sectional view showing a part of the right side surface of the rolling bearing shown in FIG. Cross-sectional view near the retaining ring of a conventional rolling bearing FIG. 5 is an enlarged partial cross-sectional view showing a part of the right side surface of the rolling bearing shown in FIG.

A rolling bearing according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

This rolling bearing, as shown in FIG. , a retainer 4 for holding these rolling elements 3, a pair of protective members 5 for sealing the annular inner space of the bearing formed between the inner and outer bearing rings 1, 2, and each protective member 5 on the outer raceway. It is a self-aligning roller bearing with a pair of retaining rings 6 fixed to the ring 2 .

The inner and outer bearing rings 1 and 2 are each made of a metallic bearing part formed in an annular shape. The outer bearing ring 2 has a spherical raceway surface 7 on its inner circumference, and the inner bearing ring 1 has two rows of raceway surfaces 8 on its outer circumference. The plurality of rolling elements 3 are composed of spherical rollers and arranged in two rows between the raceway surfaces 7 and 8 .

A predetermined amount of grease (not shown) is placed between the raceway surfaces 7 and 8, and this grease acts as an initial lubricant.

As shown in FIGS. 1 and 2, the outer bearing ring 2 has an axial end portion on the inner peripheral side that abuts against an outer peripheral portion (peripheral edge portion on the outer peripheral side) 9 of the protective member 5 in the axial direction. A surface 10 and a mounting groove 11 for mounting a retaining ring 6 as described later are formed. The mounting groove 11 has a shallow U-shaped cross section and extends all around near the end surface of the outer bearing ring 2 .

The protective member 5 includes a metal core 12 formed of an annular metal plate, and a seal lip 13 attached to the core metal 12 from the center in the radial direction to the inner peripheral portion thereof and in sliding contact with the outer peripheral surface of the bearing ring 1 on the inner side. , and rubber portions 14 attached to both side surfaces of the outer peripheral portion 12a of the core metal 12. The outer peripheral portion 12a of the core metal 13 and the rubber portion 14 form the outer peripheral portion 9 of the protective member 5. As shown in FIG. The seal lip 13 and the rubber portion 14 are made of the same material, and can be attached to the core metal 12 by contacting the core metal 12 during molding of the vulcanized rubber. Although the protective member 5 has a contact-type seal lip as an example, it can be a non-contact seal or a shield.

As shown in FIGS. 2 and 3, the retaining ring 6 is made of an annular metal member that is continuous in the circumferential direction. A notch 15 is formed. Then, by crimping and fixing the crimping portion 16 between the notch 15 and the outer peripheral edge adjacent to the notch 15 to the mounting groove 11 of the outer raceway ring 2, the retaining ring 6 is secured to the outer raceway. It is attached to the ring 2 so as to press the outer peripheral portion 9 of the protective member 5 against the abutment surface 10 of the outer bearing ring 2 . The shape of the notch 15 is a V-shaped notch (V notch) for ease of processing. A notch or the like may be used. That is, the outer peripheral portion 9 of the protective member 5 is axially pressed by the contact surface 10 of the outer bearing ring 2 and the retaining ring 6 , thereby being fixed to the outer bearing ring 2 . .

This rolling bearing has the structure described above, and the caulked portion 16 formed on the outer peripheral portion of the retaining ring 6 is caulked and fixed to the mounting groove 11 of the outer bearing ring 2. It can be confirmed visually. Therefore, the retaining ring 6 can be reliably attached to the outer bearing ring 2, and the retaining ring 6 can be prevented from coming off.

In addition, the mounting groove 11 of the outer bearing ring 2 may have a depth that allows the caulked portion 16 of the retaining ring 6 to enter, and can be made much shallower than the conventional wedge-shaped retaining ring groove. Almost no stress concentration occurs in the outer bearing ring 2 at the time of mounting, and the occurrence of cracks can be prevented.

In addition, the mounting groove 11 of the outer bearing ring 2 is formed to have a shallow U-shaped cross section, and compared to the conventional wedge-shaped retaining ring groove, the difference in wall thickness around the groove is small. The effect of heat treatment is small, and it is easy to ensure dimensional accuracy.

Since the dimensional accuracy of the outer bearing ring 2 is high as described above, the outer peripheral portion 9 of the protective member 5 is reliably pressed against the outer bearing ring 2 by the retaining ring 6 . In addition, in the opposing region between the contact surface 10 of the outer bearing ring 2 and the outer peripheral portion 9 of the protective member 5 and the opposing region between the inner surface of the retaining ring 6 and the outer peripheral portion 9 of the protective member 5, the protective member 5 Since the rubber portion 14 of the rubber portion 14 is in a compressed state and is in close contact with the contact surface 10 of the outer bearing ring 2 and the inner surface of the retaining ring 6, respectively, the outer peripheral portion 9 of the protective member 5 and the outer bearing ring 2 and the retaining ring 6 is higher than in the case where the contact portions between the outer peripheral portion of the protective member and the bearing ring and the retaining ring are metal contacts. Due to these two factors, the resistance to rotation of the protective member 5 with respect to the outer bearing ring 2 is high, and as the seal lip 13 of the protective member 5 and the inner bearing ring 1 slide, the protective member 5 is Even if the seal torque acts, the outer peripheral portion 9 of the protective member 5 does not easily slip in the circumferential direction against the contact surface 10 of the outer raceway ring 2 and the inner surface of the retaining ring 6, and the protective member 5 is prevented from sliding on the inner side. Co-rotation with the bearing ring 1 on the other side is prevented.

In addition, since the contact surface 10 of the outer bearing ring 2 and the outer peripheral portion 9 of the protective member 5 are sealed by the rubber portion 14 as described above, the grease in the inner space of the bearing is transferred to the outer side. It also has the advantage of preventing leakage from occurring between the contact surface 10 of the bearing ring 2 and the outer peripheral portion 9 of the protective member 5, and leakage from the inside of the retaining ring 6 to the outside of the bearing.

1 to 3 described above, the rubber portion 14 is attached to the outer peripheral portion 12a of the core metal 12 of the protective member 5, but the rubber portion may be attached to the contact surface of the bearing ring, It may be attached to the inner surface of the retaining ring.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. Therefore, the scope of the present invention is indicated by the claims, and is intended to include all changes within the meaning and range of equivalents of the claims.

For example, in the above-described embodiment, the protective member and retaining ring are attached to the inner circumference of the outer bearing ring. can be applied.

In addition, the present invention is not limited to self-aligning roller bearings as in the embodiments, and can be applied to appropriate types of radial bearings such as cylindrical roller bearings, tapered roller bearings, and ball bearings.

1 Inner bearing ring (inner ring)
2 Outer bearing ring (outer ring)
5 Protective member 6 Retaining ring 9 Outer peripheral portion 10 Contact surface 11 Mounting groove 12 Metal core 12a Outer peripheral portion 13 Seal lip 14 Rubber portion 15 Notch 16 Crimping portion

Claims (6)

an inner bearing ring, an outer bearing ring, a plurality of rolling elements interposed between the inner bearing ring and the outer bearing ring, a cage that holds the rolling elements, and the inner a pair of protective members for sealing an annular bearing inner space formed between the outer bearing ring and the outer bearing ring; and a retaining ring for fixing the protective member to the bearing ring,
The protection member has an outer peripheral side or an inner peripheral edge portion that abuts on the bearing ring in the axial direction,
A rolling bearing in which the bearing ring has an abutting surface axially facing the peripheral edge portion of the protective member and a mounting groove for mounting the retaining ring,
The retaining ring has notches formed at a plurality of locations in the circumferential direction on the outer peripheral side or the inner peripheral side of the outer surface of the retaining ring. is attached to the bearing ring by caulking and fixing to the mounting groove of the bearing ring, and presses the peripheral edge portion of the protective member against the contact surface of the bearing ring. rolling bearing. 2. A rolling bearing according to claim 1, wherein said retaining ring is formed in an annular shape with no discontinuities in the circumferential direction. A rubber portion is provided in at least one opposing region of the opposing region between the contact surface of the bearing ring and the peripheral edge portion of the protective member and the opposing region between the retaining ring and the peripheral edge portion of the protective member. 3. A rolling bearing according to claim 1 or 2. 4. A rolling bearing according to claim 3, wherein said rubber portion is attached to said peripheral portion of said protective member. 4. A rolling bearing according to claim 3, wherein said rubber portion is attached to said contact surface of said bearing ring. 4. A rolling bearing according to claim 3, wherein said rubber portion is attached to said retaining ring.

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