JPH04123769U - Bearing device for railway vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the durability of a seal member and a bearing in a bearing device for a railway vehicle. [Structure] A free end 26b of a seal member 26 attached to a second metal ring 25 on the axle 20 side is brought into contact with the outer peripheral surface of a cylindrical portion 23c of a first metal ring 23 on the outer ring 16 side from the outside in the radial direction. When the axle 20 is rotating at high speed, the free end 26b of the seal member 26 deforms outward in the radial direction due to centrifugal force, expands in diameter, and comes into contact with the outer peripheral surface of the cylindrical portion 23c of the first metal ring 23. It disappears. Heat generation due to contact friction between the sealing member 26 and the first metal ring 23 is eliminated, and the temperature does not rise.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a bearing device for a railway vehicle with an improved seal structure.

0002

[Conventional technology]

Conventionally, as shown in Fig. 4, a bearing device for a railway vehicle has an outer ring 1 and a rolling element (circular A double-row tapered roller bearing 5 having tapered rollers 2,..., 2, an inner ring 3, and a cage 4 is mounted on an axle 7. The rear cover 6 is placed on the inner end of the bearing 5 with respect to the axle 7, and the front cover is placed on the outer end of the bearing 5. There is one in which a lid (not shown) is provided (see Japanese Utility Model Publication No. 1-174639).

0003 A base 8a of a metal ring 8 is fixed to the inner peripheral surface on the inner end side of the outer ring 1, and this base A sealing member 9 is attached to a mounting portion 8b extending axially outward from 8a. The free end 9a of the lock member 9 is brought into contact with the outer peripheral surface of the rear cover 6 from the outside in the radial direction. Ru. Note that 10 is a spring that presses the seal member 9 against the outer peripheral surface of the rear lid 6.

0004

[Problem that the idea aims to solve]

However, in the conventional railway vehicle bearing device described above, the free end of the seal member 9 Since 9a is pressed against the outer circumferential surface of the rear cover 6 by the spring 10, it is pressed together with the axle 7. When the rear lid 6 rotates at high speed, the contact area between the seal member 9 and the rear lid 6 generates heat due to friction. As a result, the temperature rises, and furthermore, the temperature of the bearing 5 also rises due to heat conduction. this Therefore, the sealing member 9 has durability problems in terms of both heat resistance and abrasion resistance. Ru. Furthermore, since the temperature of the bearing 5 also rises, lubricating grease etc. are likely to deteriorate and the shaft A problem also arises in the durability of the receiver 5.

[0005] Therefore, the purpose of this invention is to improve the durability of seal members and bearings for railway vehicles. The purpose of the present invention is to provide a bearing device.

[0006]

[Means to solve the problem] In order to achieve the above object, the present invention has an outer ring, a rolling element, an inner ring, and an outer ring. a first metal ring fixed to the end and having a cylindrical part axially outward; and a first metal ring fixed to the end of the inner ring; a second metal ring that is fixed and has an attachment portion axially outward; and an attachment portion of the second metal ring; The free end is attached to the outer peripheral surface of the cylindrical portion of the first metal ring from the outside in the radial direction. It is characterized by comprising a contacting seal member.

[0007]

[Effect]

When the axle is stopped or rotating at low speed, the free end of the seal member 1. Since it is in contact with the outer peripheral surface of the cylindrical part of the metal ring, this sealing member This prevents water, etc. from entering the area. If the axle is rotating at low speed, the sealing member There is little heat generation due to contact friction between the contact area of the first metal ring and the first metal ring, and the temperature rise is also small. Therefore, the durability of the seal member and the bearing does not pose much of a problem. On the other hand, if the axle is rotating at high speed, the seal member should be installed on the rotating axle side. Since the free end of the seal member is deformed radially outward by centrifugal force, the diameter expands. However, it does not come into contact with the outer peripheral surface of the cylindrical portion of the first metal ring. This allows the seal member to There is no heat generation due to contact friction of the first metal ring, and there is no rise in temperature, so the system The durability of the roll members and bearings is improved. Note that the free end of the seal member is made of the first metal. Although it is not in contact with the outer circumferential surface of the cylindrical part of the ring, since the axle is rotating at high speed, water etc. are blown away by the centrifugal force of the axle, so there is less risk of them entering through non-contact gaps. do not have.

[0008]

【Example】

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. As shown in Figure 1, double row The tapered roller bearing 15 includes an outer ring 16, rolling elements (tapered rollers) 17,..., 17, and an inner ring 1. 8 and a retainer 19. An axle 20 is fitted into this inner ring 18. A rear cover 21 is arranged on the inner end side of the bearing 15, and a front cover (not shown) is arranged on the outer end side. is located. The rear cover 21 is fixed to the axle 20.

[0009] On the other hand, the first metal ring 23 is fixed to the inner peripheral surface of the inner end 16a of the outer ring 16. A base portion 23a, which extends axially outward from the base portion 23a and is bent radially inwardly. a bent portion 23b, and a cylindrical portion 23c extending axially inward from the bent portion 23b. It is formed by. The outer peripheral surface of the bent portion 23b of the first metal ring 23 has the above-mentioned rear A cover ring 24 that loosely fits into the annular slit 21a of the lid 21 is fixed.

0010 Further, the second metal ring 25 is fitted onto the axle 20 and is connected to the outer end of the inner ring 18 and the rear thereof. A base 25a which is clamped and fixed between the inner end of the lid 21 and the above-mentioned axially outward within the space between the bent portion 23b and the cylindrical portion 23c of the first metal ring 23. It is formed by continuous mounting portions 25b.

[0011] Further, the seal member 26 is attached to the attachment portion 25b of the second metal ring 25. radially outward on the outer peripheral surface of the cylindrical portion 23c of the first metal ring 23. and a free end portion 26b that comes into elastic contact with the free end portion 26b.

0012 According to the above configuration, when the axle 20 stops rotating or rotates at a low speed, The free end 26b of the sealing member 26 presses against the cylindrical portion 2 of the first metal ring 23 due to its elasticity. It is in contact with the outer peripheral surface of 3c. As a result, the sealing member 26 prevents water from entering from the outside. Intrusion is prevented.

[0013] When the axle 20 is rotating at a low speed, the free end 26 of the sealing member 26 Heat generation due to contact friction between the contact portion of b and the outer peripheral surface of the cylindrical portion 23c of the first metal ring 23 is generated. There is also little rise in temperature. This can cause thermal deterioration of the seal member 26, friction, and Deterioration of grease, etc. on the receiver 15 does not pose much of a problem.

[0014] On the other hand, when the axle 20 is rotating at high speed, the base 2 of the seal member 26 6a is attached to the attachment part 25b of the second metal ring 25 on the side of the rotating axle 20. Therefore, the free end 26b of the sealing member 26 is deformed radially outward by centrifugal force. The free end portion 26b contacts the outer peripheral surface of the cylindrical portion 23c of the first metal ring 23. It disappears. Therefore, the free end 26b of the sealing member 26 and the circle of the first metal ring 23 There is no heat generation due to contact friction of the contact portion of the outer peripheral surface of the cylindrical portion 23c, and there is no rise in temperature. This prevents thermal deterioration and friction of the seal member 26 and deterioration of the grease of the bearing 15. Can be stopped.

[0015] As a result, the sealing member 26 and the bearing 15 have durability over the entire rotation range of the axle 20. This improves durability.

[0016] Note that when the axle 20 is rotating at high speed, the free end 26b of the seal member 26 is in a non-contact state with the outer peripheral surface of the cylindrical portion 23c of the first metal ring 23, but the cover ring 24 and the slit 21a of the rear cover 21, and the inside of the cylindrical portion 23c of the first metal ring 23. Due to the labyrinth structure created by the gap between the circumferential surface and the outer circumferential surface of the rear cover 21, The intrusion of water, etc. is prevented. Moreover, since the axle 20 is rotating at high speed, Water, etc. that tries to enter from the axle 20 is repelled by the centrifugal force of the axle 20, so It also prevents water from entering.

[0017] In the above embodiment, as shown in FIG. 2, the free end 26b side of the sealing member 26 By providing an appropriate number of recesses 26c on the outer peripheral surface of the free end 26b, the elasticity of the free end 26b is weakened. It becomes easier to deform outward in the radial direction due to centrifugal force. In addition, as shown in Figure 3, the seal part The free end 26b of the material 26 is attached to the cylindrical portion 23 of the first metal ring 23. If a spring 30 is provided to press against the outer peripheral surface of c, the spring 3 The free end 26b of the sealing member 26 is pressed against the cylindrical portion 23c of the first metal ring 23 with a spring force of 0. In addition to being able to press strongly against the outer peripheral surface of the spring 30, the weight of the spring 30 is The amount facilitates the free end 26b being deformed radially outward by centrifugal force.

[0018] In the above embodiment, the seal structure was on the rear lid 21 side, but the seal structure on the front lid side Needless to say, it can be applied in the same way.

[0019]

[Effect of the idea]

As is clear from the above explanation, the railway vehicle bearing device of the present invention has a Connect the free end of the seal member attached to the second metal ring to the cylindrical part of the first metal ring on the outer ring side. It is made to contact the outer circumferential surface from the outside in the radial direction. Therefore, according to the present invention, when the axle stops rotating or rotates at a low speed, In this case, the sealing member contacts the cylindrical portion of the first metal ring, preventing water from entering from the outside. Prevented. At this time, since it is stopped or rotating at low speed, the sealing member and the first metal There is little heat generation due to contact friction at the contact part of the ring, and there is also little temperature rise. On the other hand, the axle When rotating at high speed, the free end of the seal member is deflected radially outward by centrifugal force. The seal member expands in diameter and does not come into contact with the outer peripheral surface of the cylindrical portion of the first metal ring. There is no heat generation due to contact friction between the contact portion of the first metal ring and the first metal ring, and there is no rise in temperature. The durability of the seal member and bearing is improved. At this time, foreign matter may enter due to centrifugal force. can be prevented.

[Brief explanation of drawings]

[Fig. 1] Cross-sectional view of main parts of a bearing device for a railway vehicle according to the present invention

[Fig. 2] A perspective view of the main parts of the second embodiment of the sealing member

[Figure 3] Cross-sectional view of main parts of the third embodiment of the sealing member

[Figure 4] Cross-sectional view of the main parts of a conventional bearing device for railway vehicles

[Explanation of symbols]

15... Bearing, 16... Outer ring, 16a... Inner end, 17... Rolling element, 18... Inner ring, 20... Axle, 23... First metal ring, 23
c... Cylindrical part, 25... Second metal ring, 25b... Mounting part, 26
...Sealing member, 26b...Free end.

Continuation of front page (72) Creator Ayao Kuwabara 3-5-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka Prefecture Within Koyo Seiko Co., Ltd. (72) Creator Takeshi Teramoto 3-5-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka Prefecture Within Koyo Seiko Co., Ltd. (72) Creator Takato Kondo Shinsaibashisuji 1-9-10, Chuo-ku, Osaka-shi, Osaka Prefecture No. 8 Koyo Chicago Rawhide Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An outer ring, a rolling element, an inner ring, a first metal ring fixed to an end of the outer ring and having a cylindrical part axially outward, and a first metal ring fixed to an end of the inner ring and axially a second metal ring having an attachment portion on the outside; and a seal member attached to the attachment portion of the second metal ring, the free end of which contacts the outer circumferential surface of the cylindrical portion of the first metal ring from the outside in the radial direction. A bearing device for a railway vehicle, characterized by comprising: