JP2005106070A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately and easily perform positioning of a seal member in the axial direction in relation to a raceway ring, and to reduce the cost in regard to a roller bearing having the seal member. <P>SOLUTION: A peripheral surface 14 of a flange part 10 of an inner ring 2 is formed of a non-polished surface formed by cutting. The peripheral surface 14 is formed with a peripheral groove 15 for fixing the seal member 6. A metal projection part 21 to be engaged with the peripheral groove 15 is provided in an intermediate part in the axial direction of a first peripheral wall 22 of the seal member 6. Position of the seal member 6 in the axial direction S in relation to the inner ring 2 is fixed by engaging the peripheral groove 15 with the projection part 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a roller bearing having a seal member.

As a roller bearing having a seal member, one in which a metal ring of a seal is fitted to each of an outer peripheral surface of an inner ring (track ring) and an inner peripheral surface of an outer ring (track ring) (see, for example, Patent Document 1), A metal ring is held by a ring-shaped member called a holding member (for example, see Patent Document 2) in which a metal ring of a seal is fitted on the inner peripheral surface of a cylindrical seal case held by an outer ring of a bearing. There has been proposed one in which a holding member is fixed to an inner ring by bolting (for example, see Patent Document 3).
JP 2002-333031 A. Japanese Patent Application Laid-Open No. 10-184708. JP2003-4035A.

  By the way, the outer peripheral surface of the inner ring of the roller bearing and the inner peripheral surface of the outer ring are usually finished by turning. Further, as in Patent Documents 1 and 2, when the metal ring is attached to the inner ring, the outer ring, or the seal case of the bearing, in order to prevent displacement of the metal ring with respect to the race ring, The corresponding outer peripheral surface and inner peripheral surface of the outer ring and the seal case are further polished to perform final finishing. Then, the metal ring is press-fitted (tight fit) into the polished portion.

However, in the above configuration, the metal ring mounting portion must be polished in addition to the turning process, which increases the processing cost. Further, since the metal ring is fixed only by press-fitting, it is difficult to accurately set the position of the metal ring in the axial direction with respect to the raceway, and the assembly takes time.
On the other hand, according to the configuration described in Patent Document 3, the metal ring is fixed by a bolt, and the axial position of the metal ring with respect to the race is compared by applying a predetermined fixed tightening torque to the bolt. Can be set accurately. However, the number of parts such as holding members and bolts increases, resulting in high part costs.

  The present invention has been made under such a background, and an object of the present invention is to provide a roller bearing that can accurately and easily position the seal member in the axial direction with respect to the raceway and that is inexpensive. To do.

  In order to achieve the above object, the present invention provides a pair of race rings, a plurality of rollers interposed between the pair of race rings, a cage for holding the rollers, and opposite ends of the pair of race rings. The end of one of the races is formed of a flange, and a circumferential groove for fixing the seal member is formed on the peripheral surface of the flange, and the seal The member provides a roller bearing including a convex portion that engages with the circumferential groove.

  According to the present invention, it is possible to position the seal member in the axial direction with respect to the raceway in an extremely accurate and easy manner only by engaging the convex portion and the circumferential groove. Furthermore, the displacement of the seal member with respect to the raceway can be prevented by the engagement between the convex portion and the circumferential groove. Therefore, the polishing process of the portion where the seal member is fitted on the circumferential surface of the race can be eliminated, and the manufacturing cost can be significantly reduced through the reduction of the processing cost.

For example, when the circumferential surface of the end of the race ring where the circumferential groove is formed is a non-polished surface and the circumferential groove is formed by turning to the non-polish surface, the circumference of the end portion of the race ring is formed. The surface may be a black skin surface after heat treatment, and peripheral groove processing may be performed on the black skin surface.
In the present invention, the sealing member has an annular shape connecting the first peripheral wall forming the convex portion, the second peripheral wall facing the first peripheral wall, and the opposing end portions of the first and second peripheral walls. It may be made of a metal material having a cross-sectional groove shape including a side wall. In this case, the groove-shaped internal space of the seal member can be used as a space for arranging bearing parts.

For example, one end of the cage may be disposed between the first and second peripheral walls of the seal member. In this case, the space between the peripheral walls can be used as the space for arranging the cage, and the entire bearing can be made smaller.
In the present invention, the seal member may be made of a metal material having an L-shaped cross section including a peripheral wall forming the convex portion and an annular side wall extending from one end of the peripheral wall. In this case, when the bearing is driven, foreign matters such as dust can be blown outward in the radial direction of the race by the annular side wall to reliably prevent foreign matters from entering the bearing.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional side view of a roller bearing 1 according to an embodiment of the present invention. Referring to FIG. 1, a roller bearing 1 is a tapered roller bearing, and includes a plurality of tapered rollers 4 (in FIG. 1, 1) interposed between an inner ring 2 and an outer ring 3 as a pair of race rings and inner and outer rings 2 and 3. Two tapered rollers are shown), a cage 5 for holding each tapered roller 4, and a seal member 6 made of, for example, a seal for sealing between the inner and outer rings 2 and 3. In the following, the axial direction S, the first axial direction S1, the second axial direction S2, and the radial direction R of the roller bearing 1 are simply referred to as “axial direction S”, “first axial direction S1”, “second axial direction”. Also referred to as “S2” and “radial direction R”.

A track 8 having a groove-shaped cross section is formed over the entire circumference in the axial direction intermediate portion of the outer peripheral portion 7 of the inner ring 2, and each tapered roller 4 is disposed on the track 8. By forming the track 8, flanges 9 and 10 are formed on both sides of the track 8 in the axial direction S, that is, on both ends of the outer peripheral portion 7 of the inner ring 2.
The outer peripheral surface 11 of one flange 9 is inclined with respect to the inner peripheral surface 13 of the inner ring 2 together with the raceway surface 12 of the track 8, and the outer peripheral surface 14 of the other flange 10 is an inner peripheral surface of the inner ring 2. 13 is formed in parallel. A circumferential groove 15 having a V-shaped cross section for fixing the seal member 6 is formed in the axially intermediate portion of the outer peripheral surface 14 over the entire circumference. The outer peripheral surface 14 of the collar part 10 consists of the black skin surface in which the black skin after heat processing remains in the turning surface formed by turning, ie, the non-polishing surface which is not grind | polished. The circumferential groove 15 is formed by turning the outer circumferential surface 14.

The outer ring 3 concentrically surrounds most of the inner ring 2 excluding the flange part 10, and the end 16 on the second axial direction S2 side of the outer ring 3 is positioned on the first axial direction S1 side with respect to the flange part 10. doing. A raceway surface 18 is formed on the inner circumference of the outer ring 3. The raceway surface 18 is formed of an inclined surface inclined in a conical taper shape with respect to the outer circumference surface 17 of the outer ring 3. It is in contact.
The cage 5 is formed in an annular shape and disposed between the inner and outer rings 2 and 3, and an end 19 on the second direction S <b> 2 side as one end of the cage 5 is a diameter of the flange portion 10 of the inner ring 2. It is arranged outward in the direction.

  The seal member 6 is fitted on the outer peripheral surface 14 of the flange portion 10 of the inner ring 2 in order to seal between the opposing ends 16 and 20 on the second axial direction S2 side of the inner ring 2 and the outer ring 3. Moreover, the end 19 on the second axial direction S2 side of the cage 5 is accommodated. FIG. 2 is an enlarged view around the seal member 6 of FIG. Referring to FIG. 2, the feature of the present embodiment is that the seal member 6 is provided with a metal convex portion 21 that engages with the circumferential groove 15 of the flange portion 10 of the inner ring 2, and these circumferential grooves. 15 is that the position of the seal member 6 in the axial direction S with respect to the inner ring 2 is kept constant by the engagement of 15 and the convex portion 21.

  Specifically, the seal member 6 is made of a plate-like metal material (sheet metal member) having a cross-sectional groove shape, and forms the convex portion 21 and is fitted to the outer peripheral surface 14 of the flange portion 10 of the inner ring 2. An annular first peripheral wall 22, an annular second peripheral wall 23 that is disposed radially outward of the first peripheral wall 22 and faces the first peripheral wall 22, and the first and second peripheral walls An annular side wall 26 connecting the end portions 24 and 25 on the second axial direction S2 side as opposed end portions 22 and 23 is provided.

  FIG. 3 is a partial side view of the seal member 6 along the first axial direction S1. Referring to FIGS. 2 and 3, the convex portion 21 has a V-shaped cross section. For example, by pressing, the convex portion 21 is circumferentially equidistant (for example, circumferential 4) in the middle portion in the axial direction of the annular first peripheral wall 22. -16, in this embodiment, a plurality of circumferences are formed at the circumference of 8 circumferences. Each protrusion 21 protrudes radially inward from the inner peripheral surface 38 of the first peripheral wall 22.

FIG. 4 is a partial cross-sectional side view in which the inner ring 2 and the seal member 6 that is not fitted to the inner ring 2 (free state) are arranged coaxially. Referring to FIG. 4, inner ring 2 and seal member 6 satisfy the relationship of the following expression (1).
A> B-2C (1)
A: the outer diameter of the flange 10 of the inner ring 2, B: the inner diameter of the first peripheral wall 22 of the seal member 6, and C: the convex portion 21 from the outer peripheral surface 38 of the first peripheral wall 22 in the radial direction R. height.

By satisfy | filling said Formula (1), the outer diameter A of the collar part 10 of the inner ring | wheel 2 can be made larger than the distance (B-2C) from the axis D of the sealing member 6 to the front-end | tip part 28 of the convex part 21. . Thereby, when the 1st surrounding wall 22 of the sealing member 6 is engage | inserted in the outer peripheral surface 14 of the collar part 10 of the inner ring | wheel 2, the convex part 21 can be reliably engaged with the circumferential groove 15. FIG.
The height C of the convex portion 21 is set in a range of 50% to 100% of the thickness E of the first peripheral wall 22 of the seal member 6. In the present embodiment, the height C of the convex portion 21 is set. The value of the height C is set to 100% (for example, 0.3 mm) of the wall thickness E. The reason why the height C of the convex portion 21 is set in the above range is as follows. That is, when the height C of the convex portion 21 exceeds 100% of the wall thickness E, the amount of plastic deformation of the seal member 6 is large when the seal member 6 is fitted to the outer peripheral surface 14 of the flange portion 10 of the inner ring 2. Therefore, the accuracy of the seal member 6 is deteriorated, and if it is less than 50%, the convex portion 21 and the circumferential groove 15 cannot be reliably engaged, and the convex portion 21 may be detached from the circumferential groove 15. In addition, if the height C of the convex part 21 is the range of 50 to 80% of the thickness E, it is more preferable.

  Referring to FIG. 2 again, the second peripheral wall 23 surrounds the first peripheral wall 22 and the end portion 19 on the second axial direction S2 side of the cage 5. Thereby, the end portion 19 on the second axial direction S2 side of the cage 5 is disposed between the first and second peripheral walls 22 and 23 of the seal member 6. The end 31 on the first axial direction S1 side of the second peripheral wall 23 and the end 16 on the second axial direction S2 side of the outer ring 3 are adjacent to each other in the axial direction S with a predetermined gap. .

  As described above, according to the present embodiment, the seal member for the inner ring 2 can be obtained simply by engaging the convex portion 21 of the first peripheral wall 22 of the seal member 6 with the peripheral groove 15 of the flange portion 10 of the inner ring 2. The axial positioning of 6 can be performed very accurately and easily. Further, the engagement between the convex portion 21 and the circumferential groove 15 can prevent the positional displacement of the seal member 6 with respect to the inner ring 2. Therefore, the polishing process of the outer peripheral surface 14 of the flange portion 10 of the inner ring 2 can be abolished, and the manufacturing cost can be significantly reduced through the reduction of the processing cost. That is, the outer peripheral surface 14 of the collar portion 10 of the inner ring 2 may be a black skin surface after heat treatment, and only one peripheral groove 15 may be formed on the black skin surface, which is inexpensive.

  Furthermore, by making the sealing member 6 into a groove shape in cross section, it becomes possible to utilize the groove-shaped internal space of the sealing member 6 as a space for arranging bearing parts. That is, by arranging the end portion 19 on the second axial direction S2 side of the cage 5 between the first and second circumferential walls 22 and 23 of the seal member 6, the space between the circumferential walls 22 and 23 is retained in the cage 5. The entire bearing can be made smaller.

In addition, this invention is not limited to the content of the above embodiment, A various change is possible within the range of a claim statement.
For example, instead of the seal member 6, a seal member 32 shown in FIG. The seal member 32 is made of an annular metal material having an L-shaped cross section, a peripheral wall 33 having the same configuration as the first peripheral wall 22 of the seal member 6, and a second axial direction S 2 as one end portion of the peripheral wall 33. And an annular side wall 26 extending radially outward from the end 34 on the side. In this case, when the roller bearing 1 is driven, that is, when relative rotation occurs between the inner ring 2 and the outer ring 3, foreign matters such as dust are blown out radially outward of the outer ring 3 by the annular side wall 26. It is possible to reliably prevent foreign matter from entering the inside.

  Further, as shown in FIG. 6, a raceway 8 is formed on the outer ring 3, and a flange part 10 is formed on the end part 16 on the second axial direction S <b> 2 side of the outer ring 3, and an inner peripheral surface 35 of the flange part 10 is formed. The circumferential groove 15 may be formed. In this case, the seal member 36 has the first peripheral wall 22 disposed radially outward of the second peripheral wall 23, and the convex portion 21 protrudes radially outward from the first peripheral wall 22. The convex portion 21 is engaged with the peripheral groove 15 of the inner peripheral surface 35 of the flange portion 10.

Further, as shown in FIG. 7, a metal having an L-shaped cross section, including a peripheral wall 33 and an annular side wall 26 extending radially inward from the end 34 on the second axial direction S2 side of the peripheral wall 33. The convex portion 21 of the seal member 37 made of a material may be engaged with the inner peripheral surface 35 of the flange portion 10 of the outer ring 3.
Moreover, in each said embodiment, you may form the convex part 21 in the perimeter of the 1st surrounding wall 22 and the surrounding wall 33 which respond | correspond. Furthermore, each sealing member 6, 32, 36, 37 and the convex portion 21 may be formed of a resin member. Each of the seal members 6, 32, 36, and 37 may be a non-contact type shield as in each of the above embodiments, or may be a seal having a contact lip. Furthermore, a cylindrical roller bearing may be configured using cylindrical rollers instead of the tapered rollers 4.

It is a partial cross section side view of the roller bearing concerning one embodiment of the present invention. FIG. 2 is an enlarged view around a seal member in FIG. 1. It is a partial side view in alignment with the 1st axis direction of a sealing member. It is the partial cross section side view which arranged the inner ring and the seal member in the state (free state) which is not fitted to the inner ring on the same axis. It is a partial cross section side view of the roller bearing concerning other embodiment of this invention. It is a partial cross section side view of the roller bearing concerning other embodiment of this invention. It is a partial cross section side view of the roller bearing concerning other embodiment of this invention.

Explanation of symbols

1 Roller bearing 2 Inner ring (Raceway ring)
3 Outer ring (Raceway)
4 Tapered rollers (rollers)
5 Cage 6 Sealing member 10 Hook 14 Outer peripheral surface (circumferential surface, non-polished surface)
15 circumferential groove 16 end (end facing each other)
19 End (one end)
20 ends (opposite ends)
21 convex part 22 1st peripheral wall 23 2nd peripheral wall 24 End part (opposite end part)
25 End (opposite end)
26 annular side wall 32 seal member 33 peripheral wall 34 end (one end)
35 Inner peripheral surface (peripheral surface, non-polished surface)
36 Seal member 37 Seal member

Claims (5)

A pair of races, a plurality of rollers interposed between the pair of races, a retainer for holding the rollers, and a seal member for sealing between opposing ends of the pair of races ,
The end of any one of the races is composed of a collar, and a circumferential groove for fixing the seal member is formed on the circumferential surface of the collar,
The roller bearing, wherein the seal member includes a convex portion that engages with the circumferential groove.   2. The roller bearing according to claim 1, wherein the peripheral surface of the end portion of the race ring where the peripheral groove is formed is a non-polished surface, and the peripheral groove is formed by turning the non-polished surface.   3. The seal member according to claim 1, wherein the seal member connects between the first peripheral wall forming the convex portion, the second peripheral wall facing the first peripheral wall, and the opposing end portions of the first and second peripheral walls. A roller bearing comprising a metal material having a groove shape in cross section including an annular side wall.   4. The roller bearing according to claim 3, wherein one end of the cage is disposed between the first and second peripheral walls of the seal member.   3. The sealing member according to claim 1, wherein the sealing member is made of a metal material having an L-shaped cross section including a peripheral wall that forms the convex portion and an annular side wall that extends from one end of the peripheral wall. Roller bearing.

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