JP2003097716A - Sealing device for axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable sealing device for an axle capable of preventing leakage of grease from an assembly surface for a metal fitting in a simple structure. SOLUTION: This sealing device 1 for the axle is provided with a metallic circular seal case 2 installed on an end part of an outer ring 202, a reinforcing ring 30 fitted on an inner peripheral side of the circular seal case 2, and a seal member 33 which is a rubber-like elastic body integrally formed with the reinforcing ring 30 and is equipped with a seal lip 34 tightly connecting with an outer periphery surface of an oil thrower 204 slidably. The seal member 33 is provided with a circular protrusion 37 pressed on an inner surface 21a of the circular seal case 2 and sealing between the circular seal case 2 and the reinforcing ring 30.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for sealing between an inner ring and an outer ring of an axle bearing of a railway vehicle or the like. 2. Description of the Related Art An axle bearing portion of a railway vehicle has, for example, a structure as shown in FIG. The bearing 200 includes an inner ring 201 fixed to the outer peripheral surface of the axle 300 and an outer ring 202 fixed to the axle housing. An outward tapered roller 203 is provided between the inner ring 201 and the outer ring 202.
Is provided, whereby the inner ring 201 and the axle 3
00 is rotatable with respect to the outer ring 202 and the axle housing. [0003] At both ends of the inner ring 201, an oil drain 20 as an annular fixing member for fixing the movement of the axle in the thrust direction.
4, a rear lid 205 is provided, and on both ends of the outer ring 202, the oil drain 204, the axle sealing device 100 for sealing between the rear lid 205 and the outer ring 202 are attached. Conventionally, this type of axle sealing device includes:
For example, a configuration as shown in FIG. 4 is known. In addition,
Since the axle sealing devices 100, 100 at both ends of the bearing 200 have a symmetrical configuration, the following description will focus on the axle sealing device 100 on the oil drain 204 side. FIG. 4 is a schematic sectional view of a conventional axle sealing device. Inner ring 201, outer ring 202 and oil drainer 2
04 is also indicated by a two-dot chain line. The axle sealing device 100 is such that a protective ring 104 and a seal body 103 are assembled on an inner peripheral side of a metal annular seal case 102 attached to an end of an outer ring 202. The seal body 103 is made of a metal reinforcing ring 13.
0, a sealing member 133 made of a rubber-like elastic material is integrally formed, and the sealing lip 134, dust lip 135, and sub-lip 1 formed on the sealing member 133 are formed.
The grease 36 is sealed and slid on the outer peripheral surface of the oil drain 204 to prevent leakage of grease from the bearing portion and intrusion of water and foreign matter from the atmosphere side. In addition, the protective ring 104
The cover portion 141 covers the bearing side of the seal body 103 to prevent metal powder and fretting wear powder generated in the bearing portion from entering the sealing sliding portion. [0008] In the axle sealing device constructed by combining a plurality of components as described above, in order to maintain a strong fitting force, each component is metal-fitted. Is performed. In the case of the axle sealing device 100, the fitting portion 140 of the protective ring 104 is provided on the inner peripheral side of the seal cylindrical portion 120 of the annular seal case 102.
Is fitted, and the cylindrical portion 131 of the reinforcing ring 130 of the seal main body 103 is fitted into the inner peripheral side thereof, thereby fixing each component. However, in the case of such a structure, a slight gap may be formed on an assembly surface between components. In this method, each part is formed by drawing from a flat metal plate, but it is difficult to keep the inner diameter of the cylindrical part constant at this time because of the processing accuracy. Or unevenness to some extent. [0010] Under normal operating conditions, the minute gap between the parts does not cause any particular problem, but the vent becomes inactive due to some influence, the grease becomes fluid at high temperatures, and the internal pressure of the bearing increases. When grease rises, grease may leak from the gap. In order to avoid such a gap, each component may be assembled by rubber fitting. However, the rubber fitting has a weak fitting force, and there is a concern that the fitting force may decrease due to aging. It is difficult to adopt for axle sealing device. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a highly reliable axle seal that can prevent grease leakage from a metal fitting assembly surface with a simple configuration. It is to provide a device. In order to achieve the above object, according to the present invention, there is provided an annular fixing member for abutting against an end of an inner ring of an axle bearing to fix movement of the axle in a thrust direction. An outer peripheral surface of the bearing and an outer ring of the bearing, and a metal annular seal case attached to an end of the outer ring; and a reinforcing ring metal-fitted to an inner peripheral side of the annular seal case. A sealing member for axle, comprising: a rubber-like elastic body integrally formed with the reinforcing ring; and a sealing member having a sealing lip slidably sealingly contacting the outer peripheral surface of the annular fixing member. The seal member has an annular projection which is pressed against the inner surface of the annular seal case to seal between the annular seal case and the reinforcing ring. According to this configuration, it is possible to prevent the grease from leaking from the assembly surface between the components while maintaining the strong fitting force due to the metal fitting, and to maintain a stable sealing property. In addition, since the seal member has a simple configuration in which an annular projection is provided, manufacture and assembly are easy. Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The axle sealing device of the present embodiment is suitably used for sealing between an inner ring and an outer ring in an axle bearing of a railway vehicle or the like. Since the configuration of the axle bearing portion is the same as that described in the related art, the same member numbers are used here, and detailed description thereof will be omitted. FIGS. 1 and 2 show an axle sealing device according to an embodiment of the present invention. FIG. 1 is a schematic configuration sectional view of the axle sealing device 1, and FIG. 2 is a schematic configuration sectional view showing a state before the axle sealing device 1 is assembled. As shown in FIGS. 1 and 2, the axle sealing device 1 is composed of three parts, an annular seal case 2, a seal body 3 and a protection ring 4, and an inner periphery of the metal annular seal case 2. The protective ring 4 is fitted on the side, and the seal body 3 is further fitted on the inner peripheral side. Each part is firmly fixed by metal fitting. The annular seal case 2 includes a case cylindrical portion 20.
And a case bottom 21 in the form of an inward flange extending radially inward from the air-side edge of the case cylindrical portion 20. The protective ring 4 and the seal body 3 are provided inside the case cylindrical portion 20 and the case bottom 21. Forming a case chamber. A case mounting portion 23 is formed at the bearing-side end of the case cylindrical portion 20 via a step 22. The annular seal case 2 connects the case mounting portion 23 to an end of an outer ring 202 of the bearing. It is fixed by being inserted into the part. The seal body 3 includes a metal reinforcing ring 30,
And a seal member 33 made of a rubber-like elastic material. The reinforcing ring 30 is an annular member having a substantially L-shaped cross section and including a cylindrical portion 31 and an inward flange portion 32 extending radially inward from an end of the cylindrical portion 31 on the atmosphere side. The seal member 33 is integrally formed from the surface on the atmosphere side of the inward flange portion 32 of the reinforcing ring 30 to the inner peripheral surface of the cylindrical portion 31 through the inner end and the surface on the bearing side. On the shaft side of the seal member 33, a seal lip 34, a dust lip 35 and a sub lip 3 which slidably and sealingly contact the outer peripheral surface of an oil drain (annular fixing member) 204.
6 are formed. A predetermined tightening margin is formed at the lip tip of the seal lip 34 with respect to the outer peripheral surface of the oil drain 204, and a garter spring 38 for increasing the tightening force at the lip tip is mounted at the rear position of the lip tip. I have. In operation, water and foreign substances entering from the atmosphere side are sealed by the dust lip 35 and leakage of grease from inside the bearing is prevented by the seal lip 34. By filling grease in the sealed space between the seal lip 34 and the sub lip 36,
Sealability can also be improved. Further, in the present embodiment, the sealing member 33
An annular protrusion 37 is provided on the end face on the atmosphere side. The annular protrusion 37 is arranged near the base of the seal member 33 and is formed so as to protrude from the end face of the inward flange portion 32 of the reinforcing ring 30 on the atmosphere side. In the present embodiment, two annular projections 37 each having a semicircular cross section are arranged side by side. However, the shape, the number, the arrangement, and the like of the annular projections 37 may be appropriately set according to the shape of each component. The protective ring 4 is made of a metal having a substantially L-shaped cross section and having a cylindrical fitting portion 40 and an inward flange-like cover portion 41 extending radially inward from the end of the fitting portion 40 on the bearing side. It is an annular member. The cover portion 41 extends to the vicinity of the outer peripheral surface (sliding surface) of the oil drain 204 and separates between the case chamber of the axle sealing device 1 and the bearing portion. As a result, during operation, metal powder generated in the bearing portion and the inner ring 201
Fretting abrasion powder generated at the mating surface of the oil drain 204 and the like is prevented from entering the sealed sliding portion. As shown in FIG. 1, these three parts are provided with a fitting portion 40 of the protection ring 4 on the inner peripheral side of the case cylindrical portion 20 of the annular seal case 2 and a fitting portion of the protection ring 4. 4
0 on the inner peripheral side of the cylindrical portion 31 of the reinforcing ring 30 of the seal body 3
Are assembled by being fitted respectively.
At this time, the bearing-side edge of the reinforcing ring 30 abuts on the cover portion 41 of the protective ring 4, and the air-side end surface of the inward flange portion 32 of the reinforcing ring 30 faces the case bottom 2 of the annular seal case 2.
By abutting the inner surface 21a of each of the components, the positioning of each component is performed. When the components are assembled in this manner, the annular projection 37 provided on the seal member 33 comes into pressure contact with the inner surface 21a of the case bottom 21 of the annular seal case 2. That is, since the annular projection 37 protrudes from the end face of the inward flange portion 32 of the reinforcing ring 30 in the assembling direction, the annular projection 37 is inserted into the annular seal case by inserting the seal body 3 to the abutting position. 2 is compressed in the thrust direction by the inner surface 21a, and the elastic restoring force seals the space between the annular seal case 2 and the reinforcing ring 30. Therefore, the vent becomes inactive due to some influence, the grease becomes fluid at a high temperature, and even under special operating conditions such as when the internal pressure of the bearing is increased, the assembly surface between the parts is not affected. Grease can be reliably prevented from leaking, and stable sealing performance can be obtained. Further, since a simple configuration in which the annular projection 37 is provided on the seal member 33 is sufficient, the manufacturing is easy, and the cost merit is great because the number of parts and the number of manufacturing steps are not required as compared with the conventional configuration. Further, the sealing performance of the annular projection 37 can be ensured only by inserting the seal body 3 into the annular seal case 2, so that the assembly is easy. Further, since the parts are assembled by metal fitting, a strong fitting force can be maintained for a long period of time. Although an example in which the axle sealing device is applied to a bearing portion of a railway vehicle has been described above, the present invention has a simple configuration and is easy to manufacture and assemble as described above. It can be easily applied to a type of axle sealing device. As described above, according to the present invention, since the seal member is provided with the annular projection for sealing between the annular seal case and the reinforcing ring, a strong fitting force by metal fitting is maintained. In this state, it is possible to prevent grease from leaking from the assembly surface between the components, and to maintain stable sealing performance. Further, since the seal member has a simple configuration in which an annular projection is provided, manufacture and assembly are easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration sectional view of an axle sealing device according to an embodiment of the present invention. FIG. 2 is a schematic sectional view showing a state before the axle sealing device is assembled. FIG. 3 is a schematic cross-sectional view of an axle bearing portion of a railway vehicle. FIG. 4 is a schematic sectional view of a conventional axle sealing device. DESCRIPTION OF SYMBOLS 1 Sealing device for axle 2 Annular seal case 3 Seal body 4 Protective ring 20 Case cylindrical portion 21 Case bottom 21a Inner surface 22 of case cylindrical portion Stepped portion 23 Case mounting portion 30 Reinforcement ring 31 Cylindrical portion 32 Inward flange Part 33 seal member 34 seal lip 35 dust lip 36 sub lip 37 annular protrusion 38 garter spring 40 fitting part 41 cover part 200 bearing 201 inner ring 202 outer ring 203 tapered roller 204 oil drain (annular fixing member) 205 rear lid (annular fixing member) 300 axles

Claims (1)

Claims: 1. A seal is provided between an outer peripheral surface of an annular fixing member which abuts an end of an inner ring of an axle bearing to fix movement of the axle in a thrust direction and an outer ring of the bearing. An annular seal case made of metal attached to the end of the outer ring, a reinforcing ring fitted to the inner peripheral side of the annular seal case with a metal, and a rubber-like elastic body integrally formed with the reinforcing ring. A seal member having a seal lip slidably and sealingly contacting the outer peripheral surface of the annular fixing member.The axle sealing device comprising: a seal member pressed against an inner surface of the annular seal case, An axle sealing device having an annular projection for sealing between the annular seal case and the reinforcing ring.