JPH08198109A - Bearing seal device for railroad car - Google Patents

Abstract

PURPOSE: To reduce the number of components used and simplify the processes of processing and assembly by axially dislocating the seal surface forming region from the shroud part forming region. CONSTITUTION: A ring-shaped recess 9a is formed at the end face of a rear lid 9, and a ring-shaped extension part 9b extended to the bearing 1 side is furnished in the upper part of the rear lid 9. The extension part 9b constitutes a shroud part A where the other end of a seal case 7 is enclosed from the outer diameter side while a small gap is reserved in between. The other end 7a of the seal case 7 is bent inward in the internal space of the part 9b, extends in the axial direction, and intrudes into a recess 9a formed in the rear lid (slinger) 9 so that a labyrinth seal part B is formed. At the periphery of the rear lid 9, a seal surface 9c is provided where the lip part of a resilient seal 8 is in slide contact. The seal surface 9c is ground to be smooth, and its region is dislocated toward the bearing 1 side from the end face of the extension part 9b. Therefore, the seal surface 9c forming region and shroud part A forming region are dislocated from each other in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail vehicle bearing seal device.

[0002]

2. Description of the Related Art As a seal device for a railroad vehicle bearing, for example, a structure shown in FIG. 2 is known. In this sealing device, one end of a seal case 17 is fitted to an outer ring 14 of a bearing 11 fitted to an axle 12, and an elastic seal 18 attached to the inner diameter of the seal case 17 is fitted to a shoulder portion of the axle 12. The slinger is slidably contacted with the sealing surface 19c of the rear lid 19. Furthermore, for the purpose of dust protection, snow protection, etc.,
The other end 17a of the seal case 17 is adapted to the recessed portion 19a provided on the end surface of the rear lid 19 to form the labyrinth seal portion B ', and in order to enhance the sealing function, the rear lid 1
An annular side plate 20 is fixed to the upper part of 9 by a stop pin 21, and one end 20b thereof is covered with a seal case 17 to form a shroud portion A '(shroud type). Side plate 20
One end portion 20b of the rear cover 19 extends to the vicinity of the substantially central portion of the seal case 17, and therefore a part of the sealing surface 19c of the rear lid 19 is covered by the one end portion 20a from the outer diameter side.

[0003]

In the sealing device having the above structure, the rear cover 1 is provided in order to provide the shroud portion A '.
Although a separate side plate 20 is fixed to the upper part of 9, the rear cover 19 and the side plate 20 are separated from each other because this is a structure in which a part of the sealing surface 19c is covered from the outer diameter side by the shroud portion A '. This is because unless the body is left, grinding of the seal surface 19c cannot be performed (the grinding wheel cannot enter the seal surface 19c unless the side plate 20 is removed). Therefore, three parts, that is, the rear lid 19, the side plate 20, and the stop pin 21, are required, which is one of the factors that increase the number of processing and assembling steps.

An object of the present invention is to reduce the number of parts in the shroud type sealing device as described above and to simplify the working / assembling process.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a shroud by extending an upper portion of a slinger toward a bearing to provide an annular extending portion, and covering the extending portion with a seal case. And the sealing surface of the slinger and the formation region of the shroud portion are axially displaced from each other.

[0006]

By forming the shroud part by covering the seal case with the annular extending part in which the upper part of the slinger is extended to the bearing side, the slinger part has an integral structure, and the number of parts is reduced as compared with the conventional case. Further, by making the seal surface of the slinger and the formation region of the shroud portion mutually offset in the axial direction, it is possible to grind the seal surface even though it is an integral structure.

[0007]

Embodiments of the present invention will be described below.

FIG. 1 exemplifies a railcar bearing 1 incorporating double-row tapered rollers 5. It should be noted that the figure shows only one end side of the bearing 1 (shoulder side of the axle 2: peripheral portion of the rear lid 9), but the other end side (axle end side of the axle 2: peripheral portion of the front lid).
It is good to have a similar configuration. The bearing 1 includes a pair of inner rings 3 fitted to an axle 2, an outer ring 4 fitted to a bearing box (not shown), double row tapered rollers 5 interposed between the inner and outer rings 3 and 4, and tapered rollers 5. The retainer 6 for holding is used as a main component. Sealing devices are provided at both ends of the bearing 1 to seal the inside of the bearing.

The seal device includes a seal case 7 whose one end is fixed to the inner diameter of the end of the outer ring 4, an elastic seal 8 attached to the inner diameter of the seal case 7, and a slinger fitted to the shoulder of the axle 2. It is composed of the rear lid 9 as. The axial length of the seal case 7 is larger than that of the seal case 17 of the conventional configuration shown in FIG.

An annular recess 9a is provided on the end surface of the rear lid 9, and an annular extension 9b extending toward the bearing 1 is provided on the upper portion of the rear lid 9. The extending portion 9b covers the other end of the seal case 7 from the outer diameter side with a slight gap therebetween,
It constitutes the shroud section A. In addition, the seal case 7
The other end 7a of the above is bent toward the inner diameter side in the inner diameter side space of the extending portion 9b and then extends in the axial direction to enter the recess 9a of the slinger 9 to form a labyrinth seal portion B. Furthermore, the outer diameter of the rear lid 9 is provided with a sealing surface 9c with which the lip portion of the elastic body seal 8 is in sliding contact. The seal surface 9c is smoothly ground, and the region thereof is displaced from the end surface of the extending portion 9b toward the bearing 1 side. Therefore, the seal surface 9c and the formation region of the shroud portion A are axially displaced from each other.

In the sealing device of this embodiment, since the annular extending portion 9b forming the shroud portion A is provided integrally with the rear lid 9, the number of parts is smaller than that of the conventional structure. Also,
Since the seal surface 9c and the formation region of the shroud portion A are axially displaced from each other so that they do not overlap each other in the radial direction, it is possible to grind the seal surface 9c.

In the present invention, the bearing type is not particularly limited (for example, a double-row cylindrical roller bearing may be used), and the shape of the seal case, the elastic body seal, the slinger and the like are not particularly limited.

[0013]

As described above, according to the present invention,
The upper part of the slinger is extended to the bearing side to provide an extension part, and the extension part is covered with a seal case to form a shroud part, and the seal surface and the formation region of the shroud part are axially displaced from each other. Therefore, the number of parts is reduced and the processing / assembly process is simplified as compared with the conventional configuration. Moreover, it does not hinder the grinding process of the sealing surface of the slinger.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional sealing device.

[Explanation of symbols]

 1 Bearing 2 Axle 4 Outer Ring 7 Seal Case 7a Other End 8 Elastic Seal 9 Rear Lid (Slinger) 9a Recess 9b Extension 9c Sealing Surface

Claims (1)

[Claims] 1. An outer ring of a bearing fitted to an axle is fixed at one end of a seal case, and an elastic body seal attached to an inner diameter of the seal case is slidably brought into contact with a sealing surface of a slinger fixed to the axle, and the seal is also attached. The labyrinth seal part is configured by matching the other end of the case with the recess provided on the end surface of the slinger, and the shroud part is covered by covering the seal case with an annular extension part that extends the upper part of the slinger toward the bearing side. A seal device for a railroad vehicle bearing, wherein the seal surface and the formation region of the shroud portion are axially displaced from each other.