JP2008249034A - Bearing seal and rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing seal comprising a ring having an outer diameter portion to be pressed into the inner peripheral end of an outer ring, and a lip integrated with the ring, capable of being removed from the inner peripheral end of the outer ring without giving damage to the seal surface of an inner ring, using a tool. <P>SOLUTION: In the bearing seal 1, the ring 2 has a tool latch port 6 inserted through the surface and the reverse of the seal and the tool latch port 6 is closed with a solid lubricant 7. After the solid lubricant 7 is removed from the mounted bearing seal 1, the tool is inserted from the outer diameter portion 2a of the ring 2 through an introduction portion 6a partially recessed in the inner diameter side and latched to the reverse side of the seal and the tool is raised up with the inner peripheral edge of the outer ring as a lever supporting point. Thus, the bearing seal 1 can be pushed out to the surface side and removed therefrom. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing seal interposed between inner and outer races of a rolling bearing and a rolling bearing provided with the bearing seal.

  Rolling bearings with seals are recommended for use in poor conditions such as pinch rolls and cast slab guide rolls in continuous casting equipment, such as high temperature, water cover, steam atmosphere, and places with a lot of foreign matter. ing.

  As the bearing seal, a seal having an outer diameter portion fixed to the inner peripheral end portion of the outer ring and a lip integrated with the ring is frequently used. The inner peripheral end of the outer ring is an inner peripheral portion located between the spherical track and one end surface.

  This type of bearing seal is provided at least on the inner peripheral end of one axial end depending on the housing, the lubricating structure, and the like. For example, as shown in FIG. 3, when supporting a pinch roll 31 or the like of a continuous casting facility, water and foreign matter easily pass through the seal 32 a of the bearing box 32 on the roll center side of the rolling bearing. For this reason, a bearing seal 34 is provided at least on the inner peripheral end of the outer ring 33 on the roll center side.

  The ring 35 of the bearing seal 34 illustrated in FIG. 3 is formed using a metal plate 36. In this type of bearing seal 34, the outer diameter portion 37 of the ring 35 is attached by being press-fitted into the inner peripheral end portion of the outer ring 33. The lip 38 is integrated by fixing a rubber material to the metal plate 36. The lip 38 comes into contact with the inner ring seal surface 39, restricts leakage of the lubricant from the inside of the bearing, and prevents foreign matter that has entered the outside or the sealed type bearing box from entering the inside of the bearing ( For example, Patent Document 1).

By the way, in rolling bearings, there are cases where it is desired to remove the bearing seal for reasons such as replenishing grease, internal observation for timing of bearing replacement, and measurement of internal clearance.
In order to meet such demands, conventionally, the ring and lip of the bearing seal have been integrally formed of rubber material. The outer ring is fixed to the inner peripheral end with a retaining ring, and the retaining ring is removed. There is a bearing seal that can be removed (for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 11-342459 JP-A-7-269575

However, the bearing seal as in the above-mentioned Patent Document 2 is expensive because it includes a retaining ring. For this reason, as the bearing seal, a seal that is press-fitted into the inner peripheral end of the outer ring and fixed as in FIG. 3 is preferred.
On the other hand, the bearing seal as shown in FIG. 3 is not supposed to be removed. At the site of use, a jig such as a hook rod or a screwdriver of a minus head is inserted between the lip and the inner ring seal surface to Peeling the seal for the front side is done. If such removal is performed, the inner ring seal surface may be damaged with a jig, and even if the bearing seal is replaced with a new one, there is a risk that the lip will be worn away quickly and seal leakage may occur.

  Accordingly, an object of the present invention is to prevent damage to the inner ring seal surface in a bearing seal composed of a ring having an outer diameter portion press-fitted into the inner peripheral end portion of the outer ring and a lip integrated with the ring. It is to remove from the inner peripheral end of the outer ring with a jig.

  To achieve the above object, the present invention is characterized in that the ring is provided with a jig hanging hole communicating with the seal front and back, and the jig hanging hole is closed with a solid lubricant. The configuration is adopted.

If the bearing is sealed using the bearing seal having the structure of the present invention, the ring is provided with a jig hook that communicates with the front and back of the seal. It is blocked with a drug. For this reason, if the solid lubricant is used at a temperature and a bearing operating condition such that the solid lubricant is softened and does not come off from the jig hanging hole, foreign matter can enter from the seal front side through the jig hanging hole with the solid lubricant. In addition, the lubricant inside the bearing is prevented from leaking from the back side of the seal through the jig hook. That is, the sealing performance of the bearing seal is maintained as in the conventional product. Further, when the jig hook is closed with the solid lubricant, an external force is applied and the lubricant is discharged when deformed, so that the solid lubricant can be easily removed.
When removing the bearing seal, the jig hook can be opened by drawing or crushing the solid lubricant.
The opened jig hook is in communication with the front and back sides of the seal, and a jig is put on the seal back side of the ring by inserting a jig from the seal front side. After that, it becomes possible to remove the bearing seal with the jig to the front side of the seal or to pull it out.
Therefore, the bearing seal can be removed without inserting a jig between the lip and the inner ring seal surface. That is, according to this configuration, the jig can be removed from the inner peripheral end of the outer ring with a jig so as not to damage the inner ring seal surface.

  In the above configuration, when the configuration in which the jig hook has an introduction portion that is partially recessed from the outer diameter portion of the ring toward the inner diameter side, the jig hook is removed when the solid lubricant is removed. The inlet of the mouth is opened as a gap between the inner peripheral end of the outer ring and the ring. For this reason, it is possible to insert the jig from the introduction portion and raise the jig with the inner peripheral edge of the outer ring as a fulcrum of the rod. In this way, the bearing seal can be removed by simply extruding the ring from the back side to the front side with a jig.

  As described above, the present invention provides a bearing seal having an outer diameter portion that is press-fitted into an inner peripheral end portion of an outer ring, and a lip integrated with the ring. By adopting it, it can be removed from the inner peripheral end of the outer ring with a jig so as not to damage the inner ring sealing surface.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the bearing seal 1 according to this embodiment includes a ring 2 having an outer diameter portion 2 a to be press-fitted into an inner peripheral end portion 11 of an outer ring 10 of a rolling bearing, and the ring 2. It consists of an integrated lip 3.

  The type of rolling bearing is not particularly limited as long as the bearing seal 1 can be mounted.

  The ring 2 uses a cored bar 4 made of a metal plate, and is formed by fixing a rubber material 5 to the cored bar 4. The rubber material 5 is fixed to the core metal 4 by vulcanization adhesion.

  The outer diameter portion 2a of the ring 2 is constituted by a cored bar 4 and is formed so as to follow the inner peripheral end portion 11 of the outer ring 10 formed in a cylindrical shape with an axial width as a whole. The outer diameter portion 2 a of the ring 2 may be covered with the rubber material 5 and may be configured to be press-fitted and fixed in a seal groove formed in the inner peripheral end portion 11 of the outer ring 10.

  The ring 2 includes the outer diameter portion 2a and the inner ring portion 2b extending from the outer diameter portion 2a toward the inner diameter side. The inner ring portion 2b is composed of a cored bar 4 and a rubber material 5 that covers the inner end of the seal front side and the seal back side of the cored bar 4. By obtaining strength with the cored bar 4, the expansion of the width of the ring 2 that supports the lip 3 is prevented. Thereby, the bearing seal 1 is prevented from protruding in the axial direction from the end face 12 of the outer ring 10 to prevent an increase in bearing width. It is also possible to provide the ring 2 with only the rubber material 5.

  Moreover, if the seal surface side of the metal core 4 is covered with the rubber material 5, the metal core 4 is protected from the outside of the bearing. It is also possible to cover the entire core metal 4 with the rubber material 5.

  The lip 3 protrudes from the inner end of the cored bar 4 by the rubber material 5 and comes into contact with the inner ring sealing surface 13. The ring 2 supports the lip 3 within a predetermined position and posture range.

The ring 2 is formed with a jig hook 6 communicating with the front and back of the seal. The jig hook 6 has an introduction portion 6 a that is partially recessed from the outer diameter portion 2 a of the ring 2 toward the inner diameter side.
The introduction part 6a of this embodiment is recessed in a semi-cylindrical shape, and the axial width is narrower than that of the outer diameter part 2a by notching the cored bar 4 to the seal front side. Thus, the introduction portion 6 a communicates with the seal back side through a gap 6 b generated between the outer ring 10 and the introduction portion 6 a.

  The amount of dent in the introduction portion 6a is shallower than the radial step between the inner peripheral end 11 of the outer ring 10 and the outer ring raceway. Thereby, as shown in FIG. 2, the front-end | tip part of the jig | tool J inserted from the introducing | transducing part 6a hits said level | step difference, and is restrict | limited. By performing the entry restriction in this way, it is possible to prevent the outer ring raceway and the rolling element from being damaged by mistake when the jig J is inserted.

  In this embodiment, the jig hook 6 as described above is provided at one place in the circumferential direction. However, as long as the strength of the ring 2 allows, an appropriate arrangement, number, and shape can be adopted. For example, as shown by a two-dot chain line in FIG. 1 (a), another jig hook 6 'can be provided at equal intervals in the circumferential direction.

  The jig hook 6 is closed with a solid lubricant 7. The solid lubricant 7 is solidified so as to block the introduction portion 6a. This solidification can be performed either in a state where the bearing seal 1 is alone or in a state where the bearing seal 1 is attached to the inner peripheral end portion 11 of the outer ring 10.

As the solid lubricant 7, conventionally known ones can be used. However, as the solid lubricant 7, it is preferable that the solid lubricant 7 is easy to fill the narrow introduction portion 6 a and stays at the filling portion. For example, a lubricating composition for bearings as proposed in JP-A-6-41569 can be used.
Further, the usable temperature condition of the bearing seal 1 is substantially determined by the softening temperature of the solid lubricant 7. For this reason, it is possible to adapt the bearing seal 1 to a wide range of temperature conditions by using a solid lubricant 7 having as high a softening temperature as possible.

  As shown in FIG. 2, the bearing seal 1 having the above configuration is attached by being press-fitted into the inner peripheral end portion 11 of the outer ring 10. The rolling bearing provided with the bearing seal 1 is used at such a temperature and bearing operating conditions that the solid lubricant 7 is softened and does not come off the jig hook 6. Here, when the outer ring 10 is in a bearing operating condition fixed to a housing (not shown), there is no fear that the solid lubricant 7 is detached from the jig hook 6 under the influence of centrifugal force. Temporarily, when it is set as bearing operation conditions of outer ring rotation, since solid lubricant 7 is between inner peripheral end 11 and ring 2 of outer ring 10, it is pressed against inner peripheral end 11 of outer ring 10 by centrifugal force. It is necessary to consider the impact. For this reason, this bearing seal 1 is particularly suitable for a rolling bearing fixed to the outer ring.

  As long as it is used under the above conditions, the jig hook 6 communicating with the front and back of the seal is closed with the solid lubricant 7, so the solid lubricant 7 passes the jig hook 6 from the front side of the seal. Thus, foreign matter can be prevented from entering, and the lubricant in the bearing can be prevented from leaking from the back side of the seal through the jig hook 6. That is, the sealing performance of the bearing seal 1 is maintained as in the conventional product.

  When the bearing seal 1 is removed from the inner peripheral end portion 11 of the outer ring 10, first, the solid lubricant 7 is removed by drawing or the like. Thereby, the introduction part 6 a of the jig hook 6 is opened as a gap between the inner peripheral end part 11 of the outer ring 10 and the ring 2. Since the solid lubricant 7 applies an external force and discharges the lubricating oil when it is deformed, the solid lubricant 7 can be easily removed from the jig hook 6.

  If the jig J is inserted from the introduction part 6a, the tip part enters the gap 6b on the back side of the seal. For this reason, the jig J can be hung on the back side of the bearing seal 1. The jig J may be any one as long as it is inserted into the jig hook 6 from the front side of the seal, such as a screwdriver of a minus head, an insertion jig of the same shape, a hook bar, etc., and hung on the back side of the bearing seal 1. .

  Thereafter, as shown by a two-dot chain line in FIG. 2, when the jig J is raised with the inner peripheral edge of the outer ring 10 as a fulcrum fulcrum, the ring 2 can be easily pushed out from the back side of the seal to the front side by the jig J. it can. As a result, the press-fitting of the ring 2 is released, and the bearing seal 1 can be removed.

  As described above, according to this embodiment, the bearing J is sealed with the jig J without inserting the jig J between the lip 3 and the inner ring seal surface 13, that is, without damaging the inner ring seal surface 13. 1 can be removed.

  From the opened bearing side surface, for example, it is possible to observe the inside of the bearing. This makes it possible to determine whether or not the bearing can still be used, and it is not necessary to set the replacement time at an early stage in anticipation of safety, as in the case where internal observation is not possible. it can.

  Thereafter, a new bearing seal 1 may be attached. In addition, it is thought that the core metal 4 is plastically deformed by pushing out the removed bearing seal 1 with the jig J. If such a thing is reused, since the contact condition of the lip 3 against the inner ring seal surface 13 becomes distorted, it is preferable to replace it with a new one.

a is a back view of the bearing seal according to the embodiment, b is a longitudinal sectional view of the bearing seal, and c is a plan view of a jig hook of the bearing seal. Action diagram showing the removal work of the bearing seal of FIG. a is a longitudinal sectional view of a conventional rolling bearing with a seal, and b is a longitudinal sectional view of a conventional bearing seal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing seal 2 Ring 2a Outer diameter part 2b Inner ring part 3 Lip 4 Core metal 5 Rubber material 6 Jig hook 7 Solid lubricant 10 Outer ring 11 Inner peripheral edge 12 End face 13 Inner ring seal surface

Claims (3)

In a bearing seal consisting of a ring having an outer diameter portion press-fitted into the inner peripheral end of the outer ring, and a lip integrated with the ring,
A bearing seal, wherein the ring is provided with a jig hook that communicates with the front and back surfaces of the seal, and the jig hook is closed with a solid lubricant.   The bearing seal according to claim 1, wherein the jig hook has an introduction portion that is partially recessed toward the inner diameter side from the outer diameter portion of the ring.   A rolling bearing comprising the bearing seal according to claim 1.

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