JP6341414B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device, and more particularly to a sealing device used in a roll bearing device of a Sendima rolling mill that mainly rolls hard steel materials such as electromagnetic steel plates and stainless steel plates that are hard to stretch.

Conventionally, when rolling steel materials such as electromagnetic steel plates and stainless steel plates that are hard and difficult to stretch, such as Sendima rolling mills, it has been necessary to periodically regrind the outer peripheral surface of the outer ring of the bearing that constitutes the roll.
For this reason, when the bearing is removed from the rolling mill and the bearing is removed from the rolling mill, the bearing is also disassembled and cleaned at the same time.

This rolling bearing is provided with a sealing device to prevent foreign matter from entering from the outside.
As this sealing device, one having the structure shown in FIGS. 4 and 5 is known. (Patent Document 1)
In this seed sealing device, a pair of seal members 300 for sealing a lubricant between the inner ring 100 and the outer ring 200 are arranged on the left and right.

  The seal member 300 includes a first seal member 310 held on the inner ring 100 side and a snap ring that is disposed on the inner side in the axial direction of the first seal member 310 and is detachable from the inner peripheral surface of the outer ring 2. The plate-like second seal member 320 is held by the like.

  As shown in FIG. 5, the first seal member 310 has a radially inner end portion 311 having an annular step portion 111 provided on the shoulder portion 110 of the inner ring 100 and an inner side in the axial direction of the annular step portion 111. The elastic seal lip 312 is sandwiched and fixed by a seal fixing member 400 such as a snap ring that is detachably attached to the shoulder 110, and is in elastic contact with the side surface of the second seal member 320. Yes.

  However, the radially inner end portion 311 of the first seal member 310 is fitted and fixed to the outer peripheral surface 113 of the annular step portion 111 provided on the shoulder portion 110 of the inner ring 100.

  For this reason, it is difficult to attach or detach the first seal member 310 with human power.

  As a result, it is necessary to perform cleaning with the first seal member 310 attached, and the bearing portion is not sufficiently cleaned, resulting in poor maintenance of the seal member.

JP 2012-172724 A

  In view of the above-described circumstances, an object of the present invention is to provide a rolling bearing sealing device that facilitates the attachment and detachment of the first seal member held on the inner ring side and improves the maintainability.

  In order to achieve the above object, in the present invention, a seal member for sealing a lubricant is provided between an inner ring and an outer ring, and the seal member is held on the inner ring side. And a second seal member held on the outer ring side in the axial direction inner side than the first seal member, and the first seal member has a radially inner end at the shoulder of the inner ring. An elastic step which is sandwiched and fixed by an annular step portion provided in the portion and a seal fixing member which is detachably attached to the shoulder portion on the inner side in the axial direction than the annular step portion, and which is in elastic contact with the second seal member In a sealing device for a rolling bearing having a seal lip, an elastic end face seal lip that is in elastic contact with an end face of the annular step portion and the annular step portion are provided at a radially inner end portion of the first seal member 31. Bullet in elastic contact with the outer peripheral surface of Wherein the radial seal lip is formed.

The present invention has the following effects.
According to the sealing device of the first aspect of the present invention, the first seal member includes an elastic end face seal lip in which the radially inner end thereof is in elastic contact with the end face of the annular stepped portion, and the outer periphery of the annular stepped portion. Since it is configured to be held by an elastic radial seal lip that is in elastic contact with the surface, there is no need to fit and fix the first seal member to the outer peripheral surface of the annular stepped portion, and the first seal member can be attached and detached. It can be done easily by human power and the maintenance can be improved.
According to the sealing device of the second aspect of the invention, since the elastic end face seal lip is configured to extend outward in the axial direction and radially inward, the first seal member can be attached and detached by human power. In addition, it is possible to maintain a good sealing property between the radially inner end of the first seal member and the inner ring.

Further, according to the sealing device of the third aspect of the present invention, the elastic radial seal lip extends radially inward and is bent axially inward at the distal end portion. Not only can attachment and detachment be easily performed by human power, but also leakage of lubricant from the inside can be reliably prevented.
Moreover, according to the sealing device of the invention described in claim 4, it is suitable for use in a bearing for a roll of a steel rolling mill.

The longitudinal cross-sectional view of the sealing device which concerns on this invention. The principal part enlarged view of FIG. The longitudinal cross-sectional view of the 1st sealing member used for FIG. The longitudinal cross-sectional view of the sealing device which concerns on a prior art. The principal part enlarged view of FIG.

Hereinafter, the best mode for carrying out the present invention will be described.
As shown in FIGS. 1 to 3, the sealing device according to the present invention includes a seal member 3 for sealing a lubricant between the inner ring 1 and the outer ring 2, and the seal member 3 is disposed on the inner ring 1 side. The first seal member 31 that is held, and the second plate-like second plate that is detachably held by a snap ring or the like on the inner peripheral surface of the outer ring 2 that is axially inner than the first seal member 31. The seal member 32 is constituted.

  The first seal member 31 includes an annular step 111 having a radially inner end 311 provided on the shoulder 11 of the inner ring 1 and a detachable attachment to the shoulder 11 on the axially inner side of the annular step 111. It has a basic configuration including an elastic seal lip 312 that is sandwiched and fixed by a seal fixing member 4 such as a snap ring to be attached and that is in elastic contact with the second seal member 32.

  Further, the radially inner end 311 of the first seal member 31 has an elastic end face seal lip 33 elastically contacting the end face 112 of the annular step 111 and an elastic contact with the outer peripheral face 113 of the annular step 111. An elastic radial seal lip 34 is formed.

  In this way, the radially inner end 311 of the first seal member 31 is not fitted and fixed to the outer peripheral surface 113 of the annular step portion 111 but is elastically formed by the elastic end face seal lip 33 and the elastic radial seal lip 34. Therefore, the first seal member 31 can be easily attached and detached by human power, and the maintainability can be improved.

  In the first seal member 31, an elastic seal lip 312 made of a rubber-like elastic material, an elastic end face seal lip 33, and an elastic radial seal lip 34 are integrally formed on an annular plate-like member made of a metal material.

  Further, since the elastic end face seal lip 33 is configured to extend outward in the axial direction and radially inward, the first seal member 31 can be easily attached and detached by human power. Good sealing performance between the radially inner end of the seal member 31 and the inner ring can be maintained.

  Further, since the elastic radial seal lip 34 extends radially inward and is bent axially inward at the tip 341, the first seal member 31 can be easily attached and detached by human power. In addition, leakage of lubricant from the inside can be reliably prevented.

  Furthermore, it can be optimally used for a bearing for a roll of a steel rolling mill that needs to be periodically cleaned and maintained.

  As the rubber material for the elastic seal lip 312, the elastic end face seal lip 33, and the elastic radial seal lip 34, various rubber-like elastic bodies such as fluoro rubber, silicone rubber, EPDM, nitrile rubber, acrylic rubber, and HNBR are appropriately selected. However, fluororubber is preferred from the viewpoint of heat resistance when it is exposed to high temperatures as in the roll of a steel mill.

  It is suitably used as a sealing device used for a bearing for a roll of a steel rolling mill.

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Seal member 4 Seal fixing member 11 Shoulder part 31 First seal member 33 Elastic end face seal lip 34 Elastic radial seal lip 111 Annular step part 112 End face 113 Outer peripheral face 311 Radial inner end part 312 Elastic seal lip 341 Tip

Claims (4)

A seal member (3) for sealing a lubricant is provided between the inner ring (1) and the outer ring (2), and the seal member (3) is held on the inner ring (1) side. The first seal member comprises a member (31) and a second seal member (32) held on the outer ring (2) side on the axially inner side of the first seal member (31). (31) is an annular step (111) whose radially inner end (311) is provided on the shoulder (11) of the inner ring (1) and the inner side in the axial direction from the annular step (111). A rolling bearing having an elastic seal lip (312) elastically contacting the second seal member (32) while being clamped and fixed by a seal fixing member (4) removably attached to the shoulder (11) Sealing device for
The radially inner end (311) of the first seal member (31) has an elastic end face seal lip (33) in elastic contact with the end face (112) of the annular step (111) and the annular step. A sealing device characterized in that an elastic radial seal lip (34) is formed in elastic contact with the outer peripheral surface (113) of the portion (111).   The sealing device according to claim 1, wherein the elastic end face seal lip (33) extends outward in the axial direction and radially inward.   The sealing device according to claim 1 or 2, wherein the elastic radial seal lip (34) extends radially inward and is bent axially inward at a tip end (341).   It uses for the bearing for the roll of the rolling mill for steel, The sealing device as described in any one of Claims 1-3 characterized by the above-mentioned.

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