JP2016008700A - Axle device for railway vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing seal device for a railway vehicle for preventing water intrusion into the bearing and occurrence of rust or peeling at the bearing.SOLUTION: This invention relates to a bearing seal device for a railway vehicle comprising: an axle device with a step; several rows of rolling bearings installed at the axle; a rear cover provided having an annular groove; a seal outer ring attached to an outer wheel and protruded out of the outer wheel in a width direction; and a seal member fixed to the seal outer ring and in turn slidably contacted with the outer circumferential surface of the rear cover. The extremity end of the seal outer ring is freely fitted into the annular groove to constitute a labyrinth seal. A cover member is fixed to the outer circumferential surface of the rear cover to cover an opening part of the labyrinth seal. With this arrangement, it becomes possible to prevent water intrusion into the roller bearing and to prevent occurrence of rust or peeling at the bearing.

Description

  The present invention relates to a railcar axle device.

  Conventionally, as a railcar axle device, as shown in FIG. 3, a bearing 1 mounted on an axle 10, and a front lid 2 and a rear lid 3 mounted on the axle 10 in contact with both sides of the inner ring 4 respectively. With. The bearing 1 is a rolling bearing, specifically, a double row tapered roller bearing. A split type inner ring 4 in which divided inner rings 4A and 4A are provided for the rollers 6 and 6 in each row, and an integral type outer ring 5; The roller 6, the cage 7, and the seal member 8 that is attached to the outer ring 5 so as to protrude in the width direction. The inner and outer rings 4 and 5 are made of bearing steel, and the front lid 2 and the rear lid 3 are made of normalized carbon steel. The rear lid 3 engages with a step portion of the axle 10 to restrict the position of the inner ring 4 of the bearing 1 in the axial direction, and the front lid 2 is screwed into a male screw portion at the shaft end of the axle 10 to engage with the inner ring 4. Is pressed against the back lid 3.

  The inner ring 4 extends in the width direction from the outer ring 5, and the seal member 8 is in sliding contact with the outer diameter surface of the inner ring extending portion 4a. The inner ring extending portion 4a extends from the flange portion 4b of the inner ring 4, and the outer diameter surface thereof is formed smaller than the flange portion 4b with a step. Further, an annular step portion 9 having a smaller diameter than the sliding contact portion 4c is provided on the center side in the inner ring width direction with respect to the sliding contact portion 4c of the seal member 8 in the inner ring extending portion 4a. The seal member 8 is composed of an oil seal or the like.

  As shown in an enlarged view of the portion B in FIG. 3, the seal member 8 includes a seal outer ring 11 attached to the inner diameter portion of the outer ring 5 and extending in the axial direction from the outer ring 5, and the seal outer ring 11. The seal inner ring 12 is attached to the inner diameter surface of the inner ring 12 and the elastic seal material 13 is attached to the inner diameter surface of the seal inner ring 12. The elastic seal material 13 slides on the outer diameter surface of the inner ring extending portion 4a. Touch. The elastic sealing material 13 has various shapes, but in FIG. 3, the specific shape is omitted and schematically shown. The seal outer ring 11 has a cross-sectional shape bent into a three-stage stepped cylindrical shape, and the tip end portion 11 a is loosely fitted in an annular groove 14 formed in the width surface of the rear lid 3 so that the labyrinth seal 15 is attached. It is composed. (For example, patent document 1).

JP 2000-103335 A

  However, in the railway vehicle bearing device as in Patent Document 1, the outer opening of the labyrinth is substantially exposed to the outside, so that it exceeds the sealing device by a high-pressure shower or the like during the vehicle cleaning operation. There was a risk of water entering the bearing. This water intrusion may cause rusting and peeling of the bearing.

  In view of the above problems, an object of the present invention is to provide a railcar axle device that prevents water from entering the bearing and prevents the bearing from rusting and peeling.

  The present invention includes a stepped axle, an inner ring, an outer ring, and a rolling element, a double row rolling bearing on which the inner ring is mounted on the axle, one end side of the bearing, and a stepped portion of the axle. And a rear cover that is provided with an annular groove on the surface facing the bearing, a seal outer ring that is attached to the outer ring and protrudes in the width direction from the outer ring, and is fixed to the seal outer ring. And a seal member that is slidably contacted with an outer peripheral surface of the rear lid, and a tip end portion of the seal outer ring is loosely fitted in the annular groove to constitute a labyrinth seal. The cover member is fixed to the outer peripheral surface of the rear lid so as to cover the opening of the labyrinth seal.

  The present invention further includes a stepped axle, an inner ring, an outer ring, and a rolling element, a double row rolling bearing on which the inner ring is mounted on the axle, one end of the bearing, and a stage of the axle. A rear cover that is sandwiched between the attached portion and provided with an annular groove on the surface facing the bearing, a seal outer ring that is attached to the outer ring and protrudes in the width direction from the outer ring, and a seal outer ring. And a seal member that is slidably brought into contact with the outer peripheral surface of the rear lid, and a front end portion of the seal outer ring is loosely fitted in the annular groove to constitute a labyrinth seal. In the apparatus, a cover member is fixed to the outer peripheral surface of the rear lid so as to cover the opening portion of the labyrinth seal, the claws are provided on the cover member, and the outer peripheral surface of the rear lid is A groove that engages the claw is formed. The features.

  With this railcar axle device, it is possible to prevent water from entering the inside of the rolling bearing and to prevent the bearing from rusting and peeling.

1 is a cross-sectional view of a railcar axle device according to an embodiment of the present invention. 1 is an enlarged view of a periphery of a sealing device according to an axle device for a railway vehicle of the present invention. It is sectional drawing of the conventional axle apparatus for rail vehicles. It is a sealing device periphery enlarged view concerning the conventional railcar axle device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the double-row tapered roller bearing 20 for a railway vehicle includes an outer ring 21, two rows of rolling elements (conical rollers) 22, an inner ring 23, and a cage 25. An axle 26 is attached to the inner rings 23, 23. A rear lid 27 is disposed on the inner end side of the axle 26 of the roller bearing 20, and a front lid 28 is disposed on the outer end side. Between the outer ring 21 and the rear lid 27 and between the outer ring 21 and the front lid 28, there are provided railway vehicle bearing sealing devices 29, respectively.

  FIG. 2 shows the sealing device 29 on the rear lid 27 side in detail. The sealing device 29 includes a seal outer ring 31 attached to the inner diameter portion of the outer ring 21 and extending in the axial direction from the outer ring 21, a seal inner ring 32 attached to the inner diameter surface of the seal outer ring 31, The elastic sealing material 33 is attached to the inner diameter surface of the ring 32, and the elastic sealing material 33 is in sliding contact with a sleeve 37 provided on the outer diameter surface of the rear lid. Here, the sleeve 37 has a folding ring portion 37 a that is folded back in a U-shaped cross section toward the bearing center side on the bearing end side, and is attached to the outer peripheral surface of the rear lid 27 by press-fitting. . Further, the seal outer ring 31 has a cross-sectional shape bent into a three-stepped cylindrical shape, and the tip end portion 31a is loosely fitted in an annular groove 27a formed in the width surface of the rear lid 27 to be a labyrinth seal. 35.

  Moreover, although the opening of the labyrinth seal 35 opens in the radial direction of the axle 26, a resin cover 36 is disposed so as to cover the opening. The cover 36 is provided with an engaging claw 36a, and the claw 36a is engaged with a concave groove 27b provided on the outer peripheral surface of the rear lid, or the cover is fixed by caulking or the like.

  According to the configuration of the present invention, it is possible to prevent water from entering the inside of the rolling bearing and to prevent the bearing from being rusted or peeled off. In addition, the cover made of resin contributes to the weight reduction of the railcar axle device. Furthermore, although the present invention is an example in which the cover is applied to the labyrinth of the rear lid, the same effects as the present invention can be obtained even when applied to the front lid.

20 Roller Bearing 21 Outer Ring 22 Rolling Element 23 Inner Ring 24 Spacer 25 Cage 26 Axle 27 Rear Cover 28 Front Cover 29 Sealing Device

Claims (2)

  A stepped axle, an inner ring, an outer ring, and rolling elements are provided, and the inner ring is sandwiched between a double row rolling bearing mounted on the axle, one end side of the bearing, and a stepped portion of the axle. And a rear lid disposed with an annular groove on a surface facing the bearing, a seal outer ring attached to the outer ring and projecting in a width direction from the outer ring, and fixed to the seal outer ring, A seal member that is slidably contacted with an outer peripheral surface of the rear lid, and a tip of the seal outer ring is loosely fitted in the annular groove to form a labyrinth seal. An axle device for a railway vehicle, wherein a cover member is fixed to an outer peripheral surface of the rear lid so as to cover an opening portion of the labyrinth seal.   The railcar axle device according to claim 1, wherein the cover member is provided with a claw, and an outer peripheral surface of the rear lid is formed with a concave groove to be engaged with the claw.

Images