JP2008281025A - Seal for bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove a seal for a bearing without damaging a core. <P>SOLUTION: This seal 5 for a bearing is formed by arranging a plurality of tool hooking openings 56, 56, 56 communicating with the front and back sides of the core 51 at three equidistant points in the circumferential direction. Thereby, an extraction tool 7 is hooked to three positions on the back side of the core 51 of the seal 5 for a bearing by using the respective tool hooking openings 56 with an outer ring 1 positioned, the seal 5 for a bearing is pulled toward the front side by the extraction tool 7 to keep the core 51 in a range of elastic deformation, and thereby the seal 5 for a bearing can be extracted from the outer ring 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a 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. (For example, Patent Document 1).

  In order to avoid an increase in the seal width, bearing seals having a metal plate core are the mainstream. The outer peripheral part of the bearing seal is press-fitted and fixed to the outer ring. The lip of the bearing seal is formed by fixing a rubber material to the whole or a part of the core metal. The lip comes into contact with the inner ring sealing surface, restricts the leakage of the lubricant from the inside of the bearing, and prevents foreign matter that has entered the outside or the sealed bearing box from entering the inside of the bearing. The end portion of the outer ring is an inner peripheral portion located between the spherical raceway and one end surface, and the bearing seal is provided at at least one end portion depending on the housing, the lubricating structure, and the like.

  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.

Japanese Patent Application Laid-Open No. 11-342459

  However, although the above-mentioned bearing seal has obtained strength with a metal core, it is not designed to be removed after being attached to the outer ring once. The outer ring part of the metal core forms a press-fit part on the outer periphery of the bearing seal, so the strength is increased by bending, but the inner ring part extending inwardly from the outer ring part has low strength. . If a jig such as a hook rod or screwdriver is inserted between the lip and the inner ring seal surface and the bearing seal is squeezed out, the inner ring part of the core metal is easily twisted and plastic deformation occurs. End up. When the inner ring portion of the core metal undergoes plastic deformation, the contact of the lip against the inner ring seal surface becomes distorted. Even if correction is made and reused, complete correction is impossible, and it is inevitable that the sealing performance is deteriorated. For this reason, the removal of the bearing seal is not recommended and must be replaced after the removal.

  Accordingly, an object of the present invention is to enable the bearing seal to be removed so as not to damage the core metal.

  In order to achieve the above object, the present invention provides a bearing seal comprising a cored bar made of a metal plate and a rubber material fixed to the cored bar, wherein a lip is formed by the rubber material. A configuration was adopted in which a plurality of jig hanging holes communicating with the front and back of the gold were provided in a distributed manner in the circumferential direction.

By adopting a configuration in which a plurality of jig hooks communicating with the front and back of the core bar are provided in a distributed manner in the circumferential direction, a plurality of jig hooks are used to disperse in the circumferential direction and serve as a bearing seal. A jig can be hung.
That is, if the bearing is sealed using such a bearing seal, when the bearing seal is to be removed, a pulling jig is applied to two or more positions on the back side of the core of the bearing seal. The pulling load can be distributed and received on the cored bar. Thereafter, the bearing seal can be removed so that the core metal is not damaged by pulling the bearing seal to the front side so that the core metal is within the range of elastic deformation by the extraction jig.

  In the above configuration, if the configuration in which the jig hooks are provided at at least three locations in the circumferential direction is employed, it is difficult for the metal core to warp as when the metal core is pulled at two locations, The drawing load can be evenly distributed in the circumferential direction of the cored bar, and it becomes easy to pull out within the range of elastic deformation.

  Here, the jig hook is often used after the operation time of the bearing has elapsed. For this reason, if a configuration in which the jig hook is closed with a lid is employed, it is possible to prevent a decrease in sealing performance.

  If the configuration in which the lid is formed of the rubber material is adopted, the lid can be easily formed simultaneously with the formation of the lip. In addition, since the lid is made of a rubber material, each jig hook can be easily opened by a cutter only when necessary at the site of use.

  If the structure which has the cut | interruption which forms the said lid | cover in the said rubber material is employ | adopted, the effort of the above-mentioned opening will be lost.

  As described above, according to the present invention, by adopting the above configuration, the bearing seal can be removed so that the cored bar is not damaged.

Hereinafter, a rolling bearing according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the rolling bearing according to this embodiment is configured as a self-aligning roller bearing, and includes an outer ring 1 having a spherical raceway 11 and an inner ring 2 having a pair of inner ring raceways 21 and 22 in two rows. A plurality of barrel rollers 3 and 3 interposed between the spherical raceway 11 and each of the inner ring raceways 21 and 22, and a plurality of barrel rollers 3 and 3 in each row in a circumferential direction. 4 and 4 and bearing seals 5 and 5 that are press-fitted and fixed to both ends of the outer ring 1.

  As shown in FIG. 2, the bearing seal 5 includes a metal core 51 made of a metal plate and a rubber material 52 fixed to the metal core 51.

  The cored bar 51 has an inner ring part 54 formed in an inward flange shape from an outer ring part 53 along one end of the outer ring 1. When the strength is obtained only with the rubber material 52, the seal width is increased. Therefore, the strength is secured by the core metal 51 in order to avoid an increase in the bearing width.

  The rubber material 52 is fixed to the metal core 51 by vulcanization adhesion.

  The bearing seal 5 is formed with a lip 55 that protrudes from the inner ring portion 54 of the metal core 51 by a rubber material 52. The lip 55 protrudes toward the inner ring sealing surface. The cored bar 51 supports the lip 55 within a predetermined position and posture range.

  Further, the bearing seal 5 is provided with a press-fit structure portion on the outer periphery by fixing a rubber material 52 so as to cover the outer ring portion 53. The end of the outer ring 1 is a seal groove that is recessed from the spherical track 11 toward the outer diameter side. The bearing seal 5 is press-fitted and fixed to the end portion of the outer ring 1 in a press-fit structure portion composed of a rubber material 52 and an outer ring portion 53 of the core metal 51.

  The rubber material 52 covers the front side of the inner ring portion 54 of the cored bar 51, and protects the cored bar 51 from the outside of the bearing. It is also possible to cover the entire core bar 51 with the rubber material 52.

  As shown in FIGS. 2 and 3, the bearing seal 5 is provided with a plurality of jig hooks 56 in communication with the front and back of the cored bar 51 in a distributed manner in the circumferential direction. In this bearing seal 5, three jig hooks 56, 56, 56 are provided at equal intervals in the circumferential direction.

  The jig hooks 56 can be arranged in four and five in the circumferential direction, and an appropriate arrangement, number, and shape can be adopted as long as the strength, sealing performance, etc. of the cored bar 51 allow. By increasing the circumferential equidistribution of the jig hook 56 after increasing the strength of the core bar 51, it is possible to avoid an increase in local stress due to the distributed load, and the core bar 51 is elastically deformed. It becomes easy to stay within the range.

  In this embodiment, each jig hook 56 is formed as a hole penetrating the metal core 51 on the front and back. Alternatively, if the outer ring portion 53 of the core metal 51 is cut out or recessed into the inner diameter side, a gap communicating between the front and back of the core metal 51 is provided between the core metal 51 and the end of the outer ring 1. The gap can be used as a jig hook.

  If a jig hook is formed on the bearing seal side as described above, it becomes unnecessary to form a retaining hole or a retaining groove for a detachable fixture such as a retaining ring or a screw on the outer ring side. There is no need to change.

  Each jig hook 56 is closed with lids 57a and 57b. Thereby, the fall of the sealing performance accompanying formation of each jig hook 56 is prevented. In addition, as long as the use condition of a bearing permits, it is also possible to employ | adopt the structure with which each jig hook 56 is open | released outside the bearing.

  The lids 57a and 57b are made of a rubber material 52. The rubber material 52 is fixed to the metal core 51 after the molding of the metal core 51 is completed. Accordingly, each jig hook 56 can be easily closed by fixing the rubber material 52, and it is not necessary to prepare the lids 57a and 57b separately.

  Since the lids 57a and 57b are made of the rubber material 52 that forms the lip 55, the lids 57a and 57b can be easily cut open so as to communicate with the jig hooks 56 only when necessary at the site of use. In addition, by forming the external display indicating the portions of the lids 57a and 57b on the bearing seal 5, the above-described slitting is facilitated.

  In addition, it is also possible to employ a configuration in which the lids 57a and 57b are provided separately from the cored bar 51 and the rubber material 52 and are detachable.

  Here, the rubber material 52 has cuts 58 for forming the lids 57a and 57b. Thereby, the labor of the above-mentioned cutting is eliminated. The form of the cut 58 can be determined as appropriate. For example, the cut 58 can be a straight line, an end ring that defines a one-sided lid, or the like.

  Each jig hook 56 is preferably as small as possible from the viewpoint that lubricant leakage is suppressed, the strength of the cored bar 51 is easily maintained, and the formation of a lid with the rubber material 52 is facilitated.

  The bearing seal 5 having the above configuration is removed while the outer ring 1 is positioned. Even if a pulling load is applied to the bearing seal 5, the outer ring 1 does not move, and the jig is not detached and a strange force is not applied to the bearing seal 5. Normally, when the outer ring 1 is tightly fitted, the positioning is sufficiently performed for pulling out the bearing seal 5, and even when the outer ring 1 is loosely fitted, the outer ring pressed against the housing side by the load of the shaft 6 in the load range. 1 is sufficiently positioned for pulling out the bearing seal 5.

  Next, a drawing jig 7 is prepared. The drawing jig 7 is hung at two or more positions behind the cored bar 51 of the bearing seal 5 using each jig hanging opening 56, and the hanging portions are in the same parallel stroke in the axial direction, and What can be moved forward and backward simultaneously is used. When such a drawing jig 7 is used, uniform pulling can be easily applied to each jig hook 56 and the drawing work becomes easy.

  In this embodiment, the extraction jig 7 includes a support leg 71 that is concentric with the shaft center on the end surface of the shaft 6, and a nut 72 that can be moved forward and backward in the axial direction by rotating the handle with respect to the support leg 71. And two or more hook arms 73, 73, 73 supported by the nut 72 so as to be swingable in the radial direction. Each hook arm 73 is equally distributed around the support leg 71 at three locations in the circumferential direction. It is a thing. The pulling jig 7 having such a configuration is known for pulling out the inner ring, and can be easily obtained by changing its hook arm to a hook that can be hung on the jig hook 56.

  The support leg 71 of the extraction jig 7 is set on the end face of the shaft 6, and the circumferential direction phases of the three hook arms 73 and the jig hooks 56 are made to coincide with each other. Then, the hook portion of the corresponding hook arm 73 is inserted into the bearing and is hung on the back surface of the core metal 51. At this time, the hook portion of the hook arm 73 does not hit the lip 55. Thereby, damage to the lip 55 is prevented. When three jig hooks 56, 56, 56 are used in this way, the drawing jig 7 is hung at three circumferentially equidistant positions on the back of the core bar 51 of the bearing seal 5.

  In this embodiment, the hook arm 73 is directly hooked on the back surface of the inner ring portion 54 of the core metal 51, but the portion is covered with the rubber material 52 and the rubber material 52 is interposed between the hook arm 73 and the core metal 51. It is possible to disperse the pulling load and prevent the hook arm 73 from slipping.

As described above, when the hook arm 73 of the extraction jig 7 has been engaged with each jig hook 56, the nut 72 is retracted to the front side in parallel with the axial direction by rotating the handle of the extraction jig 7. Accordingly, the hook arms 73 are simultaneously retracted to the front side in parallel with the axial direction with the same stroke. During this time, the bearing seal 5 is pulled to the front side by the drawing jig 7 so that the cored bar 51 is within the range of elastic deformation. Thereby, the rubber material 52 of the press-fitting and fixing portion of the bearing seal 5 is elastically deformed and removed from the seal groove of the outer ring 1, and the bearing seal 5 is pulled out from the end of the outer ring 1.
If it carries out as mentioned above, the seal 5 for bearings can be removed so that the metal core 51 and the lip | rip 55 may not be damaged. Plastic deformation of the core metal 51 does not occur.

  Thereafter, when the extraction jig 7 is removed, the lids 57a and 57b are naturally closed by the elasticity of the rubber material 51, and each jig hook 56 is closed.

From the open side of the bearing, the internal clearance can be measured with a clearance gauge to check the residual clearance.
It is also possible to perform internal observation from the open bearing side. 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.

The longitudinal cross-sectional view which shows the whole structure of the rolling bearing which concerns on embodiment a is an enlarged view of the seal of FIG. 1, b is a front view of the jig hanging portion of a a is an operation diagram showing a state in which a pulling jig is hung on the rolling bearing of FIG. 1, b is an operation diagram showing an enlarged view of the jig hooking portion of a, and c is an imaginary line showing the drawing jig in the state of a. Front view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Roller-shaped roller 4 Cage 5 Seal 6 Shaft 7 Drawing jig 11 Spherical raceway 21 and 22 Inner ring raceway 51 Core metal 52 Rubber material 53 Outer ring part 54 Inner ring part 55 Lip 56 Jig hook 57a, 57b Lid 58 Cut 71 Support leg 72 Nut 73 Hook arm

Claims (5)

In a seal for a bearing comprising a metal bar made of a metal plate and a rubber material fixed to the metal core, and a lip formed by the rubber material,
A bearing seal, wherein a plurality of jig hooks communicating with the front and back of the core bar are provided in a distributed manner in the circumferential direction.   The bearing seal according to claim 1, wherein the jig hooks are provided at at least three locations at equal intervals in the circumferential direction.   The bearing seal according to claim 1, wherein the jig hook is closed with a lid.   The rolling bearing according to claim 3, wherein the lid is made of the rubber material.   The rolling bearing according to claim 4, wherein the rubber material has a cut forming the lid.

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