JP2016038056A - Rolling bearing with seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing with a seal which can secure seal performance in both use conditions at shaft rotation and an outer ring rotation.SOLUTION: A rolling bearing with a seal comprises: an outer ring 20 composed of a plurality of rollers 11, a cylinder part 21 having raceway surfaces 21a of a plurality of the rollers 11 at an internal peripheral face, and a pair of flange parts 22 extending to the inside in a radial direction at both end parts of the cylinder part 21 in an axial direction; and an annular seal 30. The seal 30 seals a clearance between a shaft member S which is inserted into the rolling bearing 10 and an internal peripheral face of the outer ring 20, and has a seal base part 32 which co-rotates together with the shaft member S, and a seal lip 33 which extends to the outside in the radial direction and to the outside in the axial direction from the seal base part 32, and contacts with the internal peripheral face of the outer ring 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rolling bearing with a seal.

  As a seal used in a conventional rolling bearing, one having a seal lip disposed on one end or both ends in the axial direction of a shell of a needle roller bearing and having an inner diameter side is known (for example, Patent Document 1, 2).

  For example, in the shell-type roller bearing described in Patent Document 1, the shell is press-molded into a bottomed cylindrical shape, the opening side formed into a stepped thin wall is bent to form a collar portion, and carburizing and quenching is performed. Harden. Then, needle rollers and a cage are mounted inside the shell, and the outer diameter of the seal that does not have a cored bar is reduced so that the collar portion is passed through and the shell is mounted.

  Further, in the shell-type roller bearing described in Patent Document 2, after a cage, a roller, and a seal member are incorporated into the shell in which one collar portion is formed, the thin end portion of the shell is bent (curled). By doing so, the other collar part is formed.

Japanese Patent No. 4380262 JP 2004-293620 A

  By the way, when the seal having the seal lip on the inner diameter side described in Patent Documents 1 and 2 above is used for shaft rotation, the contact condition intended by the design can be maintained, so that sealing performance can be secured. When used in (shell rotation), the seal lip on the inner diameter side is deformed radially outward by the centrifugal force, so that the sealing performance has been lowered.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a rolling bearing with a seal that can ensure sealing performance under both use conditions of shaft rotation and outer ring rotation.

The above object of the present invention can be achieved by the following constitution.
(1) An outer ring comprising a plurality of rollers, a cylindrical portion having raceway surfaces of the plurality of rollers on the inner peripheral surface, and a pair of collar portions extending radially inward at both axial end portions of the cylindrical portion, And a seal that seals between the shaft member inserted into the seal-equipped rolling bearing and the inner peripheral surface of the outer ring, and is a seal that rotates together with the shaft member. A rolling bearing with a seal, characterized by having a base, and a seal lip extending from the seal base to the radially outer side and the axially outer side, or radially outward and axially inner, and contacting the inner peripheral surface of the outer ring.

  According to the present invention, the seal seals between the shaft member inserted into the roller bearing with seal and the inner peripheral surface of the outer ring, and includes a seal base that rotates together with the shaft member, and a diameter from the seal base. It has a seal lip that extends outward in the direction and axially outside, or radially outward and inward in the axial direction and contacts the inner peripheral surface of the outer ring, thus ensuring sealing performance under both axial rotation and outer ring rotation conditions. can do.

It is a sectional view explaining a 1st embodiment of a rolling bearing with a seal concerning the present invention. It is an expanded sectional view of the periphery of the seal | sticker shown in FIG. It is an expanded sectional view explaining 2nd Embodiment of the rolling bearing with a seal | sticker which concerns on this invention.

  Hereinafter, each embodiment of the rolling bearing with a seal concerning the present invention is described in detail based on a drawing.

(First embodiment)
First, with reference to FIG.1 and FIG.2, 1st Embodiment of the rolling bearing with a seal | sticker which concerns on this invention is described.

  The rolling bearing 10 of the present embodiment is a needle roller bearing, and as shown in FIG. 1, a shell (outer ring) 20 having a cylindrical portion 21, a plurality of needle rollers 11 incorporated in the shell 20, and a plurality of needle rollers A cage 12 that holds the needle rollers 11 at substantially equal intervals in the circumferential direction, and annular seals 30 that are respectively disposed at both axial ends of the inner circumferential surface of the shell 20 are provided.

  Examples of the material of the shell 20 include low carbon steel such as SPCC having good cold workability. Examples of the material of the needle roller 11 include SUJ2. Examples of the material of the cage 12 include low carbon steel such as SPCC having good cold workability.

  The inner peripheral surface of the cylindrical portion 21 of the shell 20 is a raceway surface 21a on which the plurality of needle rollers 11 roll. A pair of collar portions 22 extending inward in the radial direction are respectively formed at both axial ends of the cylindrical portion 21. The method of processing the collar portion 22 of the present invention is arbitrary, but usually one collar portion 22 is formed by deep drawing, and the other collar portion 22 is formed by hot curl or cold curl. In addition, in this embodiment, although the axial direction both ends of the shell 20 are opening, it is not limited to this, One axial direction edge part may be obstruct | occluded. In this case, the seal 30 is disposed only on the open side.

  As shown in FIG. 2, the seal 30 is made of a cored bar 31 in which a metal plate such as a steel plate is formed in an annular shape and an elastic material such as rubber or elastomer, and is fixed to the cored bar 31 and extends outward in the axial direction. An annular seal base portion 32 and a seal lip 33 that extends while inclining radially outward and axially outward and contacts the inner peripheral surface of the cylindrical portion 21 of the shell 20 are provided. The cored bar 31 may not be provided.

  The inner diameter of the seal base 32 is set smaller than the outer diameter of the shaft member S inserted into the bearing 10, and when the shaft member S is inserted, the seal base 32 is elastically deformed. Therefore, when the shaft member S rotates, the seal base 32 rotates together with the shaft member S. When the shaft member S is used for rotating the outer ring without rotating, the seal base 32 is not rotated together with the shaft member S. Therefore, even in such a case, it is expressed that the shaft member S rotates together.

  In the rolling bearing 10 configured in this way, when used in outer ring rotation, the seal 30 does not rotate and centrifugal force does not act on the seal lip 33, so that the intended contact state of the design can be maintained and sealing performance can be maintained. Can be secured. Further, when used in shaft rotation, the seal 30 rotates and the seal lip 33 is deformed radially outward by centrifugal force, so that the sealing performance can be improved. Therefore, it is possible to ensure sealing performance under both use conditions of shaft rotation and outer ring rotation.

  As described above, according to the rolling bearing 10 of the present embodiment, the seal 30 has the seal lip 33 that extends radially outward and axially outside and contacts the inner peripheral surface of the shell 20. Sealability can be ensured under both usage conditions of outer ring rotation.

(Second Embodiment)
Next, a second embodiment of the rolling bearing with seal according to the present invention will be described with reference to FIG. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same or equivalent reference numerals in the drawings, and description thereof is omitted or simplified.

  In the present embodiment, as shown in FIG. 3, a seal 50 is used instead of the seal 30. This seal 50 is made of an elastic material such as rubber or elastomer, and extends in a radially outward direction and an axially outward direction from a seal base 51 formed along the axial direction and an axially outer end of the seal base 51. And a seal lip 52. The seal lip 52 contacts the inner peripheral surface of the cylindrical portion 21 of the shell 20. Note that a core metal may be incorporated in the seal base 51.

  The inner diameter of the seal base 51 is set smaller than the outer diameter of the shaft member S inserted into the bearing 10, and when the shaft member S is inserted, the seal base 51 is elastically deformed. Therefore, when the shaft member S rotates, the seal base 51 rotates together with the shaft member S. Note that, when the shaft member S is used in the outer ring rotation in which the shaft member S does not rotate, the seal base 51 does not rotate together with the shaft member S. Therefore, even in such a case, it is expressed that the shaft member S rotates together.

  In the case of the rolling bearing 10 configured as described above, when the outer ring is used for rotation, the seal 50 does not rotate and the centrifugal force does not act on the seal lip 52. Therefore, the intended contact state of the design can be maintained and the sealing performance can be maintained. Can be secured. Further, when used in shaft rotation, the seal 50 rotates and the seal lip 52 is deformed radially outward by centrifugal force, so that the sealing performance can be improved. Therefore, it is possible to ensure sealing performance under both use conditions of shaft rotation and outer ring rotation.

As described above, according to the rolling bearing 10 of the present embodiment, the seal 50 has the seal lip 52 that extends radially outward and axially outside and contacts the inner peripheral surface of the shell 20. Sealability can be ensured under both usage conditions of outer ring rotation.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the said embodiment, although the seals 30 and 50 are arrange | positioned at the axial direction both ends of the shell 20, it is not limited to this, You may arrange | position at the axial direction one end part.
Moreover, in the said embodiment, although the single row rolling bearing was employ | adopted as a rolling bearing, it is not limited to this, You may employ | adopt a double row or more rolling bearing.
Moreover, although the said embodiment demonstrated the rolling bearing using a holder | retainer, the same effect can be acquired also in the case of a rolling bearing which does not have a holder | retainer.
In the above embodiment, the outer seal lip extends radially outward and axially outward, but the same effect can be obtained even when extending radially outward and axially inside.
The rolling bearing may also be a rolling bearing using a seal having a seal base that rotates together with the shaft member, and a seal lip that extends radially outward and axially outward from the seal base and contacts the inner peripheral surface of the outer ring. For example, the same effect can be obtained without being limited to the seal shape of the above embodiment.

DESCRIPTION OF SYMBOLS 10 Rolling bearing 11 Needle roller 12 Cage 20 Shell (outer ring)
21 Cylindrical part 22 Collar part 30 Seal 31 Core 32 Seal base 33 Seal lip 50 Seal 51 Seal base 52 Seal lip S Shaft member

Claims (1)

With multiple times,
An outer ring including a cylindrical portion having raceway surfaces of the plurality of rollers on an inner peripheral surface, and a pair of flange portions extending radially inward at both axial end portions of the cylindrical portion;
A rolling bearing with a seal comprising an annular seal,
The seal seals between a shaft member inserted into the sealed rolling bearing and an inner peripheral surface of the outer ring, and includes a seal base that rotates together with the shaft member, and a radial direction from the seal base. A rolling bearing with a seal, characterized by having a seal lip that extends outward and axially outward, or radially outward and axially inward, and is in contact with the inner peripheral surface of the outer ring.

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