JP5554127B2 - Railway vehicle axle bearing device - Google Patents

Description

  The present invention relates to a railway vehicle axle bearing device.

  Some bearing devices are used for axle support of railway vehicles as shown in Patent Documents 1 and 2, for example, and this type of bearing device is illustrated in FIG.

  This bearing device includes a bearing 100 and a seal device 150. The bearing 100 is a double row tapered roller bearing which is a kind of rolling bearing, and includes an outer ring 110, an inner ring 120, and a tapered roller 130 as a rolling element. The tapered rollers 130 are interposed between the outer raceway surface of the outer ring 110 and the inner raceway surface of the inner ring 120, and are double rows.

  The seal device 150 is arranged on both sides in the axial direction of the seal case 152 and the seal member 154 fixed to the inner periphery of each seal case 152 and the seal member 152 fixed to the inner periphery of each seal case 152. Oil drainer 162. The seal member 154 constitutes a contact seal with the oil drain 162 when the tip thereof contacts the oil drain 162.

  More specifically, as shown in FIG. 15, the seal member 154 includes a seal lip 154d. The seal lip 154d has a main lip 154a on the inner side of the bearing device and a dust lip 154b on the outer side of the bearing device, and the lips 154a and 154b are in contact with the oil drain 162 at two locations separated in the axial direction.

  On the other hand, the end 152a in the axial direction of the seal case 152 is fitted into a circumferential groove 162a formed in the oil drain 162 via a gap to constitute a non-contact seal. With the contact seal and the non-contact seal, the seal device 150 seals the space between the outer ring 110 and the inner ring 120 of the bearing 100 (the inner space of the bearing 100) at both axial ends. That is, leakage of lubricant such as grease from the internal space of the bearing 100 and intrusion of dust, water and the like into the internal space are prevented. This effect is largely due to the contact seal among the contact seal and the non-contact seal.

JP 2003-336651 A JP 2007-255599 A

  Incidentally, in the bearing device, when the inner ring 120 rotates with respect to the outer ring 110, the temperature rises due to friction between the lips 154a and 154b and the oil drain 162 or the like. As the temperature rises, the lips 154a and 154b deteriorate, and the lips 154a and 154b wear due to friction. The deterioration and wear of these lips 154a and 154b are harmful, and it is difficult to improve the durability of the contact seal. Moreover, the torque with respect to the bearing device increases due to the friction between the lips 154a and 154b and the oil drain 162.

  On the other hand, the non-contact seal constituted by the end 152a of the seal case 152 and the circumferential groove 162a of the oil drain 162 does not increase the torque with respect to the bearing device. Also, no adverse effects due to friction or high temperature occur. However, sufficient sealing performance cannot be expected with this non-contact seal alone. That is, through the gap between the end 152a of the seal case 152 and the circumferential groove 162a of the oil drain 162, leakage of the lubricant from the bearing inner space and intrusion of dust or the like into the bearing inner space can occur.

  This invention makes it a subject to improve the sealing performance of the non-contact seal in the bearing apparatus for railway vehicle axles in view of the said situation.

In order to solve the above problems, a bearing device for a railway vehicle axle according to the present invention includes an outer ring fixed to an axle box of a railway vehicle, an inner ring fixed to the axle and rotating together with the axle , a raceway surface of the outer ring, and an inner ring raceway. A rolling stock axle bearing device having a double row rolling element disposed between the outer ring side seal member and the inner ring side seal member for sealing the inner space of the bearing. Attached to the inner ring, extended toward the end face of the inner ring and made non-contact with the member on the rotating side, and the inner ring side seal member is attached to the inner ring without contacting any member other than the inner ring, A portion extending toward the end surface of the inner ring and the inner ring side seal member are opposed to each other in the radial direction to form a first labyrinth seal, and the outer ring side seal member and another member attached to the axle separately from the inner ring Through an annular gap Is opposed in the radial direction, characterized in that the radial width of the annular gap is larger than the radial width of the first labyrinth seal.

  In order to improve the sealing performance with a non-contact seal, a high-precision labyrinth seal is required. However, in contrast to the bearing device described with reference to FIGS. 14 and 15, members such as the oil drain 162 (hereinafter simply referred to as other members) are separate from the bearing device and are not manufactured by the bearing device manufacturer. It is customary. For this reason, it is difficult to accurately manage the labyrinth seal between the bearing device side member and the other member. On the other hand, in this application, in the railway vehicle axle bearing device, the labyrinth seal is formed between the outer ring side seal member attached to the outer ring and the inner ring, so the bearing device manufacturer manages the accuracy of the seal gap of the labyrinth seal. can do. Therefore, the sealing performance of the labyrinth seal can be improved. Further, the outer ring side seal member is formed with a portion that swells outside the bearing inner space because the outer ring side seal member extends toward the end surface of the inner ring. Therefore, the outer ring side seal member has a form similar to a conventional seal assembly including a seal member and a seal case, and can be replaced with a conventional seal assembly without changing the design around the bearing device. In addition, it can be easily attached to and detached from the outer ring.

In the above configuration, of the opposing two surfaces forming a first labyrinth seal, it may be an uneven portion is provided on either one or both (first embodiment, see FIG. 1-3). Further, a concave portion may be provided in the outer ring side seal member, and the tip of the inner ring side seal member may be accommodated in the concave portion (see the second and third embodiments, FIGS. 4 and 5). Moreover, you may form the recessed part of an outer ring | wheel side sealing member with an elastic material (refer 2nd Embodiment and FIG. 4).

  In the above configuration, the outer ring side seal member may be provided with an elastic portion made of an elastic material, and a first labyrinth seal may be formed between the elastic portion and the inner ring side seal member (second, 4-6). Embodiment, see FIGS. 4, 6-8). Further, an elastic part made of an elastic material may be provided on the inner ring side seal member, and a first labyrinth seal may be formed between the elastic part and the elastic part of the outer ring side seal member (fourth embodiment, FIG. 6). reference). Moreover, a lip may be provided in the elastic part of the outer ring side seal member, and the first labyrinth seal may be formed by this lip and the inner ring side seal member (see the fifth and sixth embodiments, FIGS. 7 and 8). Further, a concave portion may be provided on the inner ring end face, and the tip of the outer ring side seal member may be accommodated in the concave portion (see the seventh embodiment, FIG. 9).

Further, in the above configuration, the outer ring side seal member may be formed a second labyrinth seal between the inner ring end face (first 1～4,7 to 11 embodiment, FIG 1～6,9- 13) .

Further, in the above configuration, a third labyrinth seal may be formed between the outer ring side seal member and another member attached to the axle separately from the inner ring (first to fourth, seventh to eleventh embodiments). , See FIGS. 1-6, 9-13 ). Moreover, you may provide an uneven | corrugated | grooved part in one or both of two opposing surfaces which comprise a 3rd labyrinth seal (refer 1st, 11th embodiment, FIGS. 1-3, 13).

  ADVANTAGE OF THE INVENTION According to this invention, the sealing performance of the non-contact seal in a railway vehicle axle bearing device can be improved.

1 is an axial sectional view of a railway vehicle axle bearing device according to a first embodiment of the present invention. It is an enlarged view of B part of FIG. It is C arrow line view of FIG. It is a principal part expanded axial sectional view of the bearing apparatus for railway vehicle axles concerning 2nd Embodiment of this invention. It is a principal part expanded axial sectional view of the bearing apparatus for railway vehicle axles concerning 3rd Embodiment of this invention. It is a principal part expanded axial sectional view of the rolling stock axle bearing device which concerns on 4th Embodiment of this invention. It is principal part expanded axial sectional drawing of the bearing apparatus for railway vehicle axles which concerns on 5th Embodiment of this invention. It is a principal part expanded axial sectional view of the bearing apparatus for railroad vehicle axles concerning 6th Embodiment of this invention. It is a principal part expanded axial sectional view of the bearing apparatus for railroad vehicle axles concerning 7th Embodiment of this invention. It is principal part expanded axial sectional drawing of the bearing apparatus for railway vehicle axles which concerns on 8th Embodiment of this invention. It is a principal part expanded axial sectional view of the bearing apparatus for railroad vehicle axles concerning 9th Embodiment of this invention. It is a principal part expanded axial sectional view of the bearing apparatus for railway vehicle axles concerning 10th Embodiment of this invention. It is a principal part expanded axial sectional view of the bearing apparatus for railroad vehicle axles concerning 11th Embodiment of this invention. It is an axial sectional view of a conventional railway vehicle axle bearing device. It is an enlarged view of A part of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a bearing device according to a first embodiment of the present invention. This bearing device is used for supporting an axle of a railway vehicle, and includes a bearing 1 and a pair of seal devices 50.

  The bearing 1 is a double-row tapered roller bearing that is a kind of rolling bearing, and includes an outer ring 10, a pair of inner rings 20, a plurality of tapered rollers 30 as rolling elements, and a pair of cages 40. Prepare as an element. The outer ring 10 has a double-row conical outer raceway surface 12 on the inner peripheral surface. The pair of inner rings 20 are adjacent to each other in the axial direction via a spacer. Each of the pair of inner rings 20 has a conical inner raceway surface 22 on the outer peripheral surface, and has a double row of inner raceway surfaces 22 as a whole. The tapered rollers 30 are arranged in a double row between the outer raceway surface 12 of the outer ring 10 and the inner raceway surface 22 of the inner ring 20 so as to roll freely. The pair of cages 40 respectively hold a plurality of tapered rollers 30 at equal intervals in the circumferential direction. A space formed between the outer ring 10 and the inner ring 20 (inner space of the bearing 1) is filled with a lubricant such as grease, and the sealing device 50 seals this space at both axial ends. In the present embodiment, a tapered roller bearing is employed as the bearing 1, but the present invention is not particularly limited thereto, and other bearings such as a cylindrical roller bearing may be employed.

  An outer peripheral surface of the outer ring 10 is fixed to an axle box (not shown) of the railway vehicle. An oil drain 62 is disposed in contact with one axial end surface of the pair of inner rings 20. The lid member 64 is disposed in contact with the other axial end surface of the pair of inner rings 20. The lid member 64 is fixed to the shaft end of the axle 2 with a bolt 66, and between the lid member 64 and the shoulder portion of the axle 2, between the oil drain 62 fitted on the outer periphery of the axle 2 and the pair of inner rings 20. The seat 23 is clamped and fixed.

  The pair of sealing devices 50 are respectively disposed at both ends of the bearing 1 in the axial direction. In the following description, only the sealing device 50 on the shaft end side (left side in FIG. 1) of the axle 2 will be described for convenience of description. The sealing device 50 on the opposite side to the sealing device 50 is substantially the same.

  As shown in an enlarged view in FIG. 2, the sealing device 50 includes an outer ring side seal member 51 attached to the outer ring 10 and an inner ring side seal member 52 attached to the inner ring 20. In the present embodiment, a first labyrinth seal LS <b> 1 is formed between the outer ring side seal member 51 and the inner ring side seal member 52. Further, a second labyrinth seal LS <b> 2 is formed between the outer ring side seal member 51 and the axial end surface 24 of the inner ring 20. In addition, a third labyrinth seal LS3 is formed between the outer ring side seal member 51 and the lid member 64. The seal gap is bent between the first labyrinth seal LS1 and the second labyrinth seal LS2 and between the second labyrinth seal LS2 and the third labyrinth seal LS3.

  The outer ring side seal member 51 extends from the outer ring 10 toward the end surface 24 of the inner ring 20. More specifically, the outer ring side seal member 51 is close to the outer peripheral surface of the lid member 64 from the outer ring side mounting portion 51a and the outer ring side mounting portion 51a mounted on the inner periphery of the opening at the axial end of the outer ring 10 by, for example, press fitting. An outer ring side main body portion 51b and an outer ring side seal portion 51c extending from the outer ring side main body portion 51b to the inner ring 20 side. In the present embodiment, the outer ring side main body 51b extends radially inward from the end of the outer ring mounting portion 51a, extends in the axial direction from the tip, and extends radially inward again from the tip. Existing and connected to the end of the outer ring side seal 51c.

  On the other hand, the inner ring side seal member 52 includes an inner ring side mounting portion 52a that is mounted on the outer periphery of the flange portion 20a at the axial end of the inner ring 20 by, for example, press fitting, and an inner ring side that extends radially inward from the inner ring side mounting portion 52a. A main body portion 52b and an inner ring side seal portion 52c extending from the inner ring side main body portion 52b to the side opposite to the inner ring 20 are provided.

  A first labyrinth seal LS1 is formed between the inner peripheral surface of the inner ring side seal portion 52c and the outer peripheral surface of the outer ring side seal portion 51c. A second labyrinth seal LS2 is formed between the front end surface of the outer ring side seal portion 51c and the end surface 24 of the inner ring 20. A third labyrinth seal LS3 is formed between the inner peripheral surface of the outer ring side seal portion 51c and the outer peripheral surface of the lid member 64.

  In the present embodiment, uneven portions are provided on the inner peripheral surface of the inner ring side seal portion 52c and the inner peripheral surface of the outer ring side seal portion 51c. More specifically, as shown in FIG. 3, a plurality of rows formed by the groove portions 53 intermittently formed in the circumferential direction are arranged in the axial direction, and the non-groove portions 54 in the rows adjacent in the axial direction are different from each other in the circumferential direction. It is supposed to take a position. However, the shape of the concavo-convex portion is not limited to this, and for example, the portion of the groove 53 may be a convex portion in FIG. Moreover, you may provide a recessed part and a convex part, for example in the shape of a dot on an internal peripheral surface. Moreover, you may provide an uneven | corrugated | grooved part in the outer peripheral surface of the outer ring | wheel side seal | sticker part 51c which opposes 1st labyrinth seal LS1, and the outer peripheral surface of the cover member 64 which opposes 3rd labyrinth seal LS3.

  With the above configuration, the following effects are obtained in the present embodiment.

  In the railway vehicle axle bearing device, the first and second labyrinth seals LS1, LS1, LS1, LS1 are provided between the outer ring 10 and the inner ring 20 with high finishing accuracy by the outer ring side seal member 51, the inner ring side seal member 52, and the inner ring 20. LS2 was formed. For this reason, the bearing device manufacturer can manage at least the accuracy of the seal gap between the first and second labyrinth seals LS1, LS2. Therefore, the sealing performance of the first and second labyrinth seals LS1, LS2 can be improved. Further, because the outer ring side seal member 51 extends from the outer ring 10 toward the end surface 24 of the inner ring 20, the outer ring side seal member 51 is formed with a portion that swells outside the bearing internal space. Therefore, the outer ring side seal member 51 has a form similar to a conventional seal assembly including a seal member and a seal case, and can be replaced with a conventional seal assembly without changing the design around the bearing device. Further, the outer ring 10 can be easily attached and detached.

  In this embodiment, a tapered roller bearing is adopted as the bearing 1 of the railcar axle bearing device. However, the tapered roller bearing is subjected to centrifugal force against the lubricant (grease) sealed inside the bearing during use. As a result, a force directed toward both ends in the axial direction of the bearing 1 works. For this reason, it is particularly important to improve the sealing performance of the non-contact seal with respect to the tapered roller bearing 1, and the seal device 50 according to the present embodiment is suitable because the first and second labyrinth seals LS1 and LS2 are provided. is there.

  Furthermore, since the first and second labyrinth seals LS1 and LS2 are formed between the outer ring 10 and the inner ring 20 in the railway vehicle axle bearing device, the following effects can be obtained. Regardless of the lid member 64, the first and second labyrinth seals LS1, LS2 can be designed. For this reason, the size of the sealing device 50 can be made equal to or smaller than that of a conventional device (for example, the sealing device 150 of FIG. 14). As a result, the conventional sealing device can be replaced with the sealing device 50. Further, since the first and second labyrinth seals LS1 and LS2 are formed regardless of the lid member 64, variations in the sealing performance of the first and second labyrinth seals LS1 and LS2 are reduced.

  Further, in the conventional sealing device 150 shown in FIG. 14, a contact seal is adopted between the oil seal 162 and the oil seal 162. For this reason, when assembling the bearing 100 and the oil drain 162 on the axle, it is necessary to pay attention to the contact state of the contact seal between the seal device 150 and the oil drain 162. On the other hand, the sealing device 50 of the present embodiment does not employ a contact seal with the lid member 64. For this reason, it becomes easy to assemble the bearing 1 and the lid member 64 to the axle 2. Further, when the effect of the third labyrinth seal LS3 is not regarded as important, it is possible to design the radial distance between the sealing device 50 and the lid member 64 to be large. In this case, when the bearing 1 and the lid member 64 are assembled to the axle 2, it is possible to suppress the interference between the seal device 50 and the lid member 64. For these reasons, the workability of assembling the bearing 1 and the lid member 64 to the axle 2 can be improved.

  Further, since the concave and convex portions are provided by the groove portion 53 on the inner peripheral surface of the inner ring side seal portion 52c and the inner peripheral surface of the outer ring side seal portion 51c, a passage is provided in the axial direction in the first and third labyrinth seals LS1 and LS3. If you think about it, you can always get wide and narrow repetitions. Thereby, the sealing effect of the 1st and 3rd labyrinth seal LS1, LS3 can be improved.

  Although another embodiment will be described below, the same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted.

FIG. 4 shows a bearing device according to a second embodiment of the present invention. In the present embodiment, the outer ring side seal member 51 is provided with a concave portion 51e, and the tip of the inner ring side seal member 52 is accommodated in the concave portion 51e. If specifically, the outer ring side seal member 51, and covers the outer ring side seal portion 51c, such as rubber, the elastic portions 51d provided made of an elastic material such as resin, toward the inner race 20 side in the elastic portion 51d A concave portion 51e that opens is provided. A first labyrinth seal LS1 is formed between the concave portion 51e of the elastic portion 51d of the outer ring side seal member 51 and the front end surface and inner and outer peripheral surfaces of the inner ring side seal portion 52c. A second labyrinth seal LS2 is formed between the radially inner portion of the opening end surface of the concave portion 51e in the elastic portion 51d and the end surface 24 of the inner ring 20. A third labyrinth seal LS3 is formed between the inner peripheral surface of the elastic portion 51d and the outer peripheral surface of the lid member 64.

FIG. 5 shows a bearing device according to a third embodiment of the present invention. Also in the present embodiment, as in the second embodiment, the outer ring side seal member 51 is provided with a concave portion 51e, and the tip of the inner ring side seal member 52 is accommodated in the concave portion 51e. The difference from the second embodiment is that the outer ring side seal member 51 is not provided with the elastic portion 51d, but a separate member 55 is provided on the bearing inner side of the outer ring side main body 51b to constitute the outer ring side seal member 51. Is a point. That is, the recessed portion 51e is configured by a separate member 55, an outer ring side main body portion 51b, and an outer ring side seal portion 51c in the outer ring side seal member 51. A first labyrinth seal LS1 is formed between the concave portion 51e and the front end surface and the outer / inner peripheral surface of the inner ring side seal portion 52c. A second labyrinth seal LS2 is formed between the opening end surface of the concave portion 51e and the end surface 24 of the inner ring 20 in the outer ring side seal portion 51c. A third labyrinth seal LS3 is formed between the inner peripheral surface of the outer ring side seal portion 51c and the outer peripheral surface of the lid member 64.

  FIG. 6 shows a bearing device according to a fourth embodiment of the present invention. In the present embodiment, the outer ring side seal member 51 is provided with an elastic part 51d made of an elastic material, and the inner ring side seal member 52 is provided with an elastic part 52d made of an elastic material. The elastic part 52d and the outer ring side seal member 51 are provided. A first labyrinth seal LS1 is formed between the elastic portion 51d. Specifically, the elastic part 51 d is provided in the outer ring side seal part 51 c of the outer ring side seal member 51. The elastic portion 51d includes an axial portion 51d1 extending in the axial direction from the tip of the outer ring side seal portion 51c toward the inner ring 20, the outer diameter portion 51d2 extending radially outward from the tip, and the tip. And an extending portion 51d3 extending to the side opposite to the inner ring 20 side. On the other hand, the inner ring side seal member 52 as a whole is an elastic portion 52d in the present embodiment. A first labyrinth seal LS1 is formed between the outer peripheral surface of the extending portion 51d3 and the inner peripheral surface of the inner ring side seal portion 52c. A second labyrinth seal LS2 is formed between the outer diameter portion 51d2 and the end surface 24 of the inner ring 20. A third labyrinth seal LS3 is formed between the inner peripheral surface of the outer ring side seal portion 51c and the axial direction portion 51d1 and the outer peripheral surface of the lid member 64.

FIG. 7 shows a bearing device according to a fifth embodiment of the present invention. In the present embodiment, the outer ring side seal member 51 is provided with an elastic portion 51d made of an elastic material, and the elastic portion 51d is provided with a lip 51d4. The lip 51d4 and the inner ring side seal member 52 are used as a first labyrinth seal LS1. Is formed. More specifically, a separate member 56 is provided on the bearing inner side of the outer ring side main body 51b, and the elastic member 51d is provided at the tip of the separate member 56, whereby the outer ring side seal member 51 is provided. Is configured . This elastic part 51d has three lips 51d4 in this embodiment. In the present embodiment, the outer ring side seal member 51 is not provided with the outer ring side seal portion 51c. A narrow portion of the first labyrinth seal LS1 is formed between the tip ends of the three lips 51d4, the tip end of the outer ring side main body portion 51b, and the inner ring side main body portion 52b and the inner ring side seal portion 52c of the inner ring side seal member 52. .

  FIG. 8 shows a bearing device according to a sixth embodiment of the present invention. In the present embodiment, similarly to the fifth embodiment, the outer ring side seal member 51 is provided with an elastic portion 51d made of an elastic material, the elastic portion 51d is provided with a lip 51d4, and the lip 51d4 and the inner ring side seal member 52 are provided. Thus, a first labyrinth seal LS1 is formed. The difference from the fifth embodiment is that the outer ring side seal member 51 is not provided with a separate member 56, is provided with an outer ring side seal part 51c, and an elastic part 51d is provided at the tip thereof. is there. Moreover, the narrow part of the 1st labyrinth seal LS1 is not provided between the front-end | tip of the outer ring | wheel side main-body part 51b and the inner ring | wheel side seal part 52c.

  FIG. 9 shows a bearing device according to a seventh embodiment of the present invention. In the present embodiment, a circumferential groove 24a as a concave portion is provided on the end surface 24 of the inner ring 20, and the tip of the outer ring side seal portion 51c of the outer ring side seal member 51 is accommodated in the circumferential groove 24a. A second labyrinth seal LS2 is formed between the tip of the outer ring side seal portion 51c and the circumferential groove 24a. The configuration of the first and third labyrinth seals LS1, LS3 is the same as that of the first embodiment except that the groove 53 is not provided.

  FIG. 10 shows a bearing device according to an eighth embodiment of the present invention. In the present embodiment, both the outer ring side seal member 51 and the inner ring 20 are provided with uneven portions, and the both uneven portions are engaged with each other to form the second labyrinth seal LS2. More specifically, an elastic portion 51d is provided on the outer peripheral side of the outer ring side seal portion 51c of the outer ring side seal member 51, and two convex portions 51d5 protruding toward the inner ring 20 are provided on the elastic portion 51d. On the other hand, the end surface 24 of the inner ring 20 is provided with two circumferential grooves 24a as concave portions. A part of the second labyrinth seal LS2 is formed by accommodating one end of the outer ring side seal portion 51c and the convex portion 51d5 in the two circumferential grooves 24a. Further, a part of the second labyrinth seal LS2 is formed between one of the convex portions 51d5 and the outer peripheral surface of the inner ring 20. A third labyrinth seal LS3 is formed between the inner peripheral surface of the outer ring side seal portion 51c and the outer peripheral surface of the lid member 64.

  FIG. 11 shows a bearing device according to a ninth embodiment of the present invention. In the present embodiment, the outer ring side seal member 51 is provided with an uneven portion, and the uneven portion is opposed to the end surface 24 of the inner ring 20 to form the second labyrinth seal LS2. More specifically, an elastic part 51d is provided from the front end to the outer periphery of the outer ring side seal part 51c of the outer ring side seal member 51, and three convex parts 51d5 protruding toward the inner ring 20 are provided on the elastic part 51d. . The narrow portions of the second labyrinth seal LS2 are formed by the tips of the three convex portions 51d5 facing the end surface 24 of the inner ring 20. A third labyrinth seal LS3 is formed between the inner peripheral surface of the outer ring side seal portion 51c and the elastic portion 51d and the outer peripheral surface of the lid member 64.

  In the present embodiment, the convex portion 51d5 is provided on the elastic portion 51d, but the portion of the elastic portion 51d facing the second labyrinth seal LS2 is flattened, and, for example, a circumferential groove is formed on the end surface 24 of the inner ring 20. For example, the uneven portion may be provided.

FIG. 12 shows a bearing device according to a tenth embodiment of the present invention. Also in the present embodiment, as in the ninth embodiment, the outer ring side seal member 51 is provided with an uneven portion, and the uneven portion of the outer ring side seal member 51 faces the end surface 24 of the inner ring 20 so that the second labyrinth seal. LS2 is formed. The difference from the ninth embodiment is that one of the convex portions 51d5 of the elastic portion 51d is opposed to the outer peripheral surface of the inner ring 20 via a gap so that a part of the second labyrinth seal LS2 is formed. . Since other configurations are the same as those of the ninth embodiment, description thereof is omitted.

FIG. 13 shows a bearing device according to an eleventh embodiment of the present invention. In the present embodiment, the outer ring side seal member 51 is provided with an elastic part 51d, and the elastic part 51d of the outer ring side seal member 51 forms a second labyrinth seal LS2. More specifically, an elastic portion 51d provided on the outer ring side main body 51b of the outer ring side seal member 51 extends to the inner ring 20 side, and its front end surface 51d6 faces the end surface 24 of the inner ring 20 via a gap. To do. A second labyrinth seal LS <b> 2 is formed by facing the tip surface 51 d <b> 6 and the end surface 24. On the other hand, a third labyrinth seal LS3 is formed between the inner peripheral surface of the elastic portion 51d and the outer peripheral surface of the lid member 64. A circumferential groove 51d7 is formed on the inner peripheral surface of the elastic portion 51d, whereby an uneven portion is provided on the inner peripheral surface of the elastic portion 51d. A wide portion of the third labyrinth seal LS3 is formed between the circumferential groove 51d7 and the outer peripheral surface of the lid member 64. Moreover, such an uneven | corrugated | grooved part may be provided in the outer peripheral surface of the cover member 64 facing the 3rd labyrinth seal LS3. Moreover, the shape of an uneven | corrugated | grooved part is not specifically limited, What was demonstrated in FIG. 3 may be sufficient, for example, the convex part and the recessed part may be provided in the shape of a dot.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Bearing 2 Axle 10 Outer ring 12 Outer raceway surface 20 Inner ring 22 Inner raceway surface 24 End surface 24a Circumferential groove 30 Rolling body 50 Sealing device 51 Outer ring side seal member 51d Elastic part 51d4 Lip 51d5 Protrusion part 51e Concave part 52 Inner ring side seal member 52d Elastic part 53 Groove part 64 Lid member (other member)
LS1 Labyrinth seal LS2 Labyrinth seal LS3 Labyrinth seal

Claims (9)

A railway vehicle having an outer ring fixed to an axle box of the railway vehicle, an inner ring fixed to the axle and rotating together with the axle, and a double row rolling element disposed between the raceway surface of the outer ring and the raceway surface of the inner ring. In the axle bearing device,
An outer ring side seal member and an inner ring side seal member for sealing the bearing internal space;
The outer ring side seal member is attached to the outer ring, extends toward the end surface of the inner ring, and is not in contact with the member on the rotating side,
The inner ring side seal member is attached to the inner ring without coming into contact with any member other than the inner ring,
A portion extending toward the end surface of the inner ring of the outer ring side seal member and the inner ring side seal member are opposed in the radial direction to form a first labyrinth seal ,
The outer ring side seal member and another member attached to the axle separately from the inner ring are opposed to each other in the radial direction via the annular gap, and the radial width of the annular gap is larger than the radial width of the first labyrinth seal. A bearing device for a railway vehicle axle characterized by being enlarged .   The bearing device for a railway vehicle axle according to claim 1, wherein an uneven portion is provided on one or both of two opposing surfaces forming the first labyrinth seal.   The bearing device for a railway vehicle axle according to claim 1 or 2, wherein a concave portion is provided in the outer ring side seal member, and a tip of the inner ring side seal member is accommodated in the concave portion.   The bearing device for a railway vehicle axle according to claim 3, wherein the concave portion of the outer ring side seal member is formed of an elastic material.   The railcar axle shaft bearing according to any one of claims 1 to 4, wherein the outer ring side seal member is provided with an elastic portion made of an elastic material, and a first labyrinth seal is formed between the elastic portion and the inner ring side seal member. apparatus.   The bearing device for a railway vehicle axle according to claim 1, wherein a concave portion is provided on an inner ring end face, and a tip of an outer ring side seal member is accommodated in the concave portion.   The bearing device for a railway vehicle axle according to claim 1, wherein a second labyrinth seal is formed between the outer ring side seal member and the end surface of the inner ring. The railway vehicle axle bearing device according to any one of claims 1 to 7 , wherein a third labyrinth seal is formed by the annular gap . The bearing device for a railway vehicle axle according to claim 8 , wherein an uneven portion is provided on one or both of two opposing surfaces constituting the third labyrinth seal.

Images