JP2009264450A - Rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device capable of suppressing a slight grease leakage.
A rolling bearing device 1 according to the present invention is arranged between an inner ring member 12 and 13 and annular members 50 and 60 arranged at both ends thereof, an outer ring 11 and an inner ring member and a inner ring member so as to freely roll. A tapered roller 14 and a seal case 30 that is provided at the end of the outer ring 11 and holds a first seal member 21 that seals between the inner and outer rings. In the annular members 50 and 60, an annular groove 52 is formed in which the distal end portion 34 of the seal case 30 is inserted to form a labyrinth structure. An annular second seal member that seals between the outer peripheral surface 34 c of the tip end 34 and the outer peripheral annular wall surface 52 c is fixed to the outer peripheral annular wall surface 52 c of the annular groove 52.
[Selection] Figure 2

Description

  The present invention relates to a rolling bearing device that supports an axle or the like of a railway vehicle.

As a bearing device that rotatably supports an axle of a railway vehicle, for example, a double-row tapered roller bearing disposed at an end portion of the axle and an oil disposed at both ends in the axial direction of the double-row tapered roller bearing There is a rolling bearing device with a seal.
The oil seal of such a conventional rolling bearing device is provided inside a cylindrical seal case fixed to the end of the outer ring, and has a seal lip that is in sliding contact with the outer peripheral surface of the relatively rotating inner ring side member. is doing. The oil seal is configured to seal the space between the inner and outer rings by this seal lip and prevent moisture from the outside from entering the bearing device and leakage of grease inside the bearing device.
Further, in the rolling bearing device, the inner ring side member is formed with an annular groove that is inserted into the tip portion of the seal case and forms a labyrinth structure with the tip portion, and grease is supplied from the oil seal. In the case of leakage, measures are taken to prevent the grease from leaking outside.

JP 2003-269471 A

In the rolling bearing device of the above conventional example, the grease leaked from the oil seal is prevented from leaking outside by the labyrinth structure constituted by the tip end portion of the seal case and the annular groove. In particular, since it communicates with the outside, it is difficult to completely block the grease because of its structure, and when the grease passes through the labyrinth, there is a case where it leaks to the outside although it is slightly.
Recently, from the viewpoints of environmental protection, product maintainability, and aesthetics, the demand for product quality has increased, and in rolling bearing devices, there has been a demand for measures to prevent even a small amount of grease from leaking to the outside.
This invention is made | formed in view of such a situation, and it aims at providing the rolling bearing apparatus which can also suppress the leak of slight grease.

  In order to achieve the above object, the present invention provides an inner ring member fixed to a rotating body, an outer ring disposed coaxially with the inner ring member, and a rolling element disposed so as to be freely rollable between the inner ring member and the outer ring. And a cylindrical seal case that is fixed to an end portion of the outer ring and protrudes in the axial direction and is provided with a first seal member therein, and the distal end portion of the seal case is provided on the inner ring member. In the rolling bearing device in which an annular groove that is inserted and forms a labyrinth structure with the tip is formed, at least one of the tip of the seal case and the annular groove has a periphery of the tip. An annular second seal member that seals between the surface and the annular wall surface of the annular groove facing the peripheral surface of the tip portion is fixed.

  According to the rolling bearing device configured as described above, at least one of the tip portion of the seal case and the annular groove is opposed to the peripheral surface of the tip portion and the peripheral surface of the tip portion. Since the second seal member that seals between the annular wall surfaces of the annular grooves is provided, the labyrinth that communicates with the outside, which is constituted by the tip portion of the seal case and the annular groove, can be sealed. As a result, even if the grease for lubricating the rolling bearing device leaks from the first seal member and the leaked grease reaches the tip end portion and the annular groove of the seal case, the grease causes the labyrinth to be absorbed by the second seal member. It is possible to prevent the grease from passing through and to prevent the grease from leaking to the outside.

In addition, an annular seal groove that is recessed radially outward is formed on an annular wall surface of the annular groove that faces the outer peripheral surface of the tip portion, and the second seal member is formed of the annular groove. It is preferable to be fixed to the seal groove in a state of protruding from the annular wall surface on the outer peripheral side of the groove.
In this case, since the second seal member protrudes from the annular wall surface on the outer periphery side of the annular groove, the grease flowing along the annular wall surface on the outer periphery side can be reliably shielded by the centrifugal force caused by the rotation of the inner ring member. Passage can be reliably prevented. As a result, the grease leakage suppressing effect can be further enhanced.

  The second seal member may be formed in an end string shape, and may be formed into an annular shape by connecting both ends thereof. In this case, the second seal member formed by connecting both ends into an annular shape is used. It can also be provided at the tip of the seal case or in the annular groove, and after the end-shaped string-like second seal member is installed in the tip or the annular groove, the two ends are joined together to form an annular second seal member Therefore, the degree of freedom in manufacturing the rolling bearing device is increased.

  According to the rolling bearing device of the present invention, it is possible to prevent slight leakage of grease.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a configuration of a rolling bearing device for a railway vehicle according to an embodiment of the present invention. The rolling bearing device 1 supports an axle S of a railway vehicle so as to be rotatable with respect to a vehicle body.

In FIG. 1, a rolling bearing device 1 includes a double-row tapered roller bearing 10 that is externally fixed to an end portion of an axle S on which wheels of the railway vehicle are fixed so as to be integrally rotatable, and both ends of the tapered roller bearing 10. A pair of sealing devices 20.
The tapered roller bearing 10 includes an outer ring 11 that is fixed to the vehicle side, a pair of inner rings 12 and 13 that are fixed to the axle S so as to be integrally rotatable, and a roller that is freely rollable between the inner and outer rings. Tapered rollers 14 and 15 as moving bodies and retainers 16 and 17 for holding the tapered rollers 14 and 15 respectively are provided.
The outer ring 11 is a member integrally formed in a cylindrical shape using alloy steel for machine structure, bearing steel or the like, and a pair of outer ring raceways 11a and 11b are provided on the inner peripheral surface thereof. The pair of inner rings 12 and 13 are members formed in a cylindrical shape using alloy steel for machine structure, bearing steel, or the like, and are fitted and fixed to the axle S. Inner ring raceways 12a and 13a facing the outer ring raceways 11a and 11b are provided on the outer peripheral surfaces of the inner races 12 and 13, respectively. The above-mentioned tapered rollers 14 and 15 are rotatably arranged between the outer ring raceways 11a and 11b and the inner ring raceways 12a and 13a, and the outer ring 11 and the inner rings 12 and 13 are rotatable relative to each other. . An annular spacer 18 is disposed between the pair of inner rings 12 and 13.

The sealing device 20 is fixed to both axial ends of the outer ring 11, a seal case 30 fixed to the end of the outer ring 11, and a first seal member 21 that is an oil seal provided inside the seal case 30. And.
The seal case 30 is a member formed by, for example, pressing a cold-rolled steel plate such as SPCC, a cylindrical fixing portion 31 that is fitted and fixed to the inner peripheral surface 11c of the end portion of the outer ring 11, and this A cylindrical holding portion 32 that extends from the fixed portion 31 to the outer side of the outer ring 11 and holds the first seal member 21 axially outside the end surface of the outer ring 11, and an annular ring that connects the fixed portion 31 and the holding portion 32. Part 33.

  The first seal member 21 is held and fixed on the inner peripheral surface of the holding portion 32, and a seal lip (not shown) that is in sliding contact with the outer peripheral surface of an annular member 50 (60) that is externally fitted and fixed to an axle S described later. have. The first seal member 21 seals between the outer ring 11 and the outer peripheral surface of the annular member 50 (60) by the seal lip, and seals between the inner and outer rings. The sealing device 20 prevents the grease for lubricating the space between the inner and outer rings 11, 12, 13 and the tapered roller 14 from leaking to the outside by the first seal member 21.

On the outer end side of each of the inner rings 12 and 13, annular members 50 and 60 that are externally fitted and fixed to the axle shaft S so as to be integrally rotatable are disposed in contact with the inner rings 12 and 13. , 60 together with the inner rings 12, 13 constitute an inner ring member.
The annular member 60 arranged on the base end side of the axle S is in contact with a step s1 formed on the axle S, and movement to the base end side in the axial direction is restricted. Further, a lid member 71 fixed by a bolt 70 is disposed at the tip of the axle shaft S. The lid member 71 is disposed in contact with the annular member 50 disposed on the tip end side of the axle S, and the rolling bearing device 1 and the annular members 50 and 60 disposed at both ends thereof are connected to the stepped portion of the axle S. The position of the rolling bearing device 1 in the axial direction is held by sandwiching it with s1.

The annular members 50 and 60 are respectively formed with annular convex portions 51 and 61 protruding outward in the radial direction. The annular protrusions 51 and 61 are respectively formed with annular grooves 52 and 62 opened to the outer ring 11 side.
The holding portion 32 of the seal case 30 is formed with a cylindrical tip portion 34 that extends to the tip side in the axial direction via an annular ring portion 35, and the tip portion 34 has an annular groove 52. , 62 are inserted.

FIG. 2 is an enlarged cross-sectional view showing the tip portions of the annular member 50 and the seal case 30 in FIG. Here, since the annular member 50 located on the distal end side of the axle S and the annular member 60 located on the proximal end side of the axle S have the same configuration, the annular member located on the distal end side will be described below. Only the structure of 50 and the seal case 30 will be described.
In FIG. 2, the tip end portion 34 is inserted into the annular groove 52 as described above. A slight gap is secured between the annular groove 52 and the tip portion 34. Specifically, between the inner peripheral surface 34a of the tip portion 34 and the inner peripheral side annular wall surface 52a of the annular groove 52, between the tip surface 34b of the tip portion 34 and the bottom wall 52b of the annular wall 52, and the tip A gap is provided between the outer peripheral surface 34c of the portion 34 and the outer peripheral side annular wall surface 52c of the annular groove 52 with a predetermined dimension. These gaps constitute a labyrinth that connects the space on the inner peripheral side of the seal case 30 and the outside of the rolling bearing device 1. The annular groove 52 and the tip end portion 34 inserted in the annular groove 52 are defined as follows. Constitutes the labyrinth structure.

In addition, an annular seal groove 53 that is recessed outward in the radial direction is formed on the outer peripheral side annular wall surface 52c facing the outer peripheral surface 34c of the tip end portion 34 with the gap. An annular second seal member 40 is fixed in the seal groove 53.
The second seal member 40 is a member formed of an elastomer material such as rubber. The second seal member 40 is fixed to the seal groove 53 and fixed to the seal groove 53. And a lip portion 42 in sliding contact with the outer peripheral surface 34c. The second seal member 40 is fixed to the seal groove 53 with the lip portion 42 protruding from the outer peripheral annular wall surface 52c, and the outer peripheral surface 34c of the tip end portion 34 by the lip portion 42 that is in sliding contact with the outer peripheral surface 34c. And the outer peripheral side annular wall surface 52c are sealed.

FIG. 3 is an external view of the second seal member 40. On both side surfaces 41 a of the fixing portion 41 of the second seal member 40, return portions 43 are provided so as to prevent the fixing portion 41 from coming out of the sealing groove 53 when fitted into the sealing groove 53. Yes.
The second seal member 40 used in the present embodiment is formed in an end string shape, and is cut into a required length, and then is made into an annular shape by joining both ends thereof.
Therefore, the second seal member 40 that is formed by joining both ends into an annular shape can be fixed to the seal groove 53, or after the second seal member 40 in a state of an end string is fixed to the seal groove 53, It can also be made circular by connecting both ends. For this reason, for example, when it is difficult to fix the second seal member 40 in an annular state to the seal groove 53, the second seal member 40 can be fixed to the seal groove 53 in a state of an end string. Depending on the configuration of the rolling bearing device 1, the fixing method of the second seal member 40 can be selected, and the degree of freedom in manufacturing the rolling bearing device 1 is increased. As a result, an increase in manufacturing cost of the rolling bearing device 1 due to the provision of the second seal member 40 can be suppressed.

  According to the rolling bearing device 1 configured as described above, the outer peripheral side wall surface 52c of the annular groove 52, the outer peripheral surface 34c of the tip portion 34, and the outer peripheral side annular wall surface 52c facing the outer peripheral surface 34c, Since the second seal member 40 that seals the gap is provided, the labyrinth that is configured by the tip portion 34 and the annular groove 52 and communicates with the outside can be sealed. As a result, even if the grease for lubricating the rolling bearing device 1 leaks from the first seal member 21 and the leaked grease reaches the front end portion 34 and the annular groove 52 of the seal case 30, the second seal member. It is possible to prevent the grease from passing through the labyrinth by 40 and to prevent the grease from leaking to the outside.

In the present embodiment, the second seal member 40 is fixed to the seal groove 53 with the lip portion 42 protruding from the outer circumferential wall surface 52 c of the annular groove 52. Thus, the grease flowing along the outer peripheral side annular wall surface 52 of the annular groove 52 can be reliably shielded and the passage thereof can be reliably prevented. As a result, the grease leakage suppressing effect can be further enhanced.
Moreover, in the said embodiment, although the 2nd seal member 40 was fixed to the annular groove 52, the seal | sticker which seals the outer peripheral surface 34c of the front-end | tip part 34 and the outer peripheral side annular wall surface 52c to the outer peripheral surface 34c of the front-end | tip part 34, for example. The member may be fixed by vulcanization adhesion or the like.

The present invention is not limited to the above embodiment. In the above embodiment, the second seal member 40 is fixed so as to protrude from the outer peripheral annular wall surface 52c. However, as shown in FIG. 4, for example, by forming the seal groove 54 on the inner peripheral annular wall surface 52a, The two seal members 40 may be protruded and fixed from the inner circumferential side annular wall surface 52a, and the space between the inner circumferential surface 34a of the tip end portion 34 and the inner circumferential side annular wall surface 52a of the annular groove 52 may be sealed.
Moreover, in the said embodiment, although the 2nd seal member 40 which has the fixing | fixed part 41 and the lip | rip part 42 which were fixed to the seal groove 53 was used, if the space | interval between the front-end | tip part 34 and the annular groove 52 can be sealed. The cross-sectional shape of the seal member is not particularly limited, and those formed in a circular shape or a polygonal shape can also be used.

It is sectional drawing which shows the structure of the rolling bearing apparatus for rail vehicles which concerns on one Embodiment of this invention. It is sectional drawing which expands and shows the front-end | tip part of an annular member and a seal case in FIG. It is an external view of a 2nd seal member. It is sectional drawing which showed the other aspect of the 2nd seal member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 11 Outer ring 12, 13 Inner ring (inner ring member)
14, 15 Tapered rollers (rolling elements)
21 First seal member 30 Seal case 34 Tip 34c Outer peripheral surface 40 Second seal member 50, 60 Annular member (inner ring member)
52 annular groove 52c outer peripheral side annular wall 53 seal groove

Claims (3)

An inner ring member fixed to the rotating body;
An outer ring disposed coaxially with the inner ring member;
A rolling element that is freely rollable between the inner ring member and the outer ring;
A cylindrical seal case fixed to the end of the outer ring and protruding in the axial direction and provided with a first seal member inside;
In the rolling bearing device in which the tip portion of the seal case is inserted into the inner ring member and an annular groove that forms a labyrinth structure together with the tip portion is formed,
At least one of the front end portion of the seal case and the annular groove is sealed between the peripheral surface of the front end portion and the annular wall surface of the annular groove facing the peripheral surface of the front end portion. A rolling bearing device, characterized in that an annular second seal member is fixed. An annular seal groove that is recessed radially outward is formed on the annular wall surface of the annular groove facing the outer peripheral surface of the tip portion,
2. The rolling bearing device according to claim 1, wherein the second seal member is fixed to the seal groove in a state of protruding from an annular wall surface on an outer peripheral side of the annular groove.   3. The rolling bearing device according to claim 2, wherein the second seal member is formed in an end string shape and is formed into an annular shape by joining both ends thereof.

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