JP2595260Y2 - Bearing device for railway vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway vehicle bearing device having an improved seal structure.

[0002]

2. Description of the Related Art Conventionally, as a railway vehicle bearing device, as shown in FIG. 4, an outer ring 1 and rolling elements (taper rollers) 2,.
A double-row tapered roller bearing 5 having an inner ring 3, an inner ring 3, and a retainer 4 is mounted on an axle 7, and a rear lid 6 fixed to the axle 7 is disposed on the inner end side of the bearing 5, and on the outer end side. There is one in which a front lid (not shown) is arranged (see Japanese Utility Model Laid-Open No. 4-123770).

A base 8a of a first metal ring 8 is fixed to the inner peripheral surface of the inner end 1a of the outer race 1, and extends from the base 8a outward in the axial direction and bent inward in the radial direction. A bent portion 8b and a cylindrical portion 8c connected to the bent portion 8b inward in the axial direction are formed. Bent portion 8 of first metal ring 8
A cover ring 9 is fixed to the outer peripheral surface of b.

On the other hand, a base 10 a of a second metal ring 10 is fitted on the outer peripheral surface of the axle 7, and the base 10 a is sandwiched between an end of the inner ring 3 and an end of the rear lid 6. Is fixed. In the space between the base portion 10a of the second metal ring 10 and the bent portion 8b of the first metal ring 8 and the cylindrical portion 8c, there is provided an attachment portion 10b that extends outward in the axial direction.

[0005] Further, the annular seal member 11 has a base portion 11 attached to the attachment portion 10b of the second metal ring 10.
a and a free end 11b connected to the base 11a and elastically contacting the outer peripheral surface of the cylindrical portion 8c of the first metal ring 8 from the outside in the radial direction.

According to the above configuration, when the axle 7 stops rotating or rotates at a low speed, the free end portion 11b of the seal member 11 is resiliently attached to the outer peripheral surface of the cylindrical portion 8c of the first metal ring 8. When the axle 7 is rotating at a high speed, the free end 11b of the seal member 11 is deformed radially outward by centrifugal force, while the axle 7 is rotating at a high speed. One of the metal rings 8 rises from the outer peripheral surface of the cylindrical portion 8c, and the heat generated by the contact between the outer peripheral surface and the seal member 11 is eliminated, so that the durability of the seal member 11 is improved.
When the axle 7 is rotating at a high speed, water or the like is flipped off by centrifugal force, so that there is little possibility that water or the like enters through a gap between the cylindrical portion 8c and the seal member 11.

[0007]

By the way, in the conventional bearing device for a railway vehicle, the free end portion 11b of the seal member 11 is moved radially outward by centrifugal force as the rotational speed of the axle 7 increases. It has a floating structure. Therefore, the permanent deformation rate of the seal member 11 increases in proportion to the amount of the floating, and the restoring force of the free end 11b of the seal member 11 may decrease due to creep deformation of the material. In this case, the free end 11b required for a predetermined contact pressure between the free end 11b of the seal member 11 and the cylindrical portion 8c of the first metal ring 8 when the rotation is stopped or rotating at a low speed.
The interference of b cannot be secured. Therefore, the contact pressure between the free end portion 11b of the seal member 11 and the cylindrical portion 8c of the first metal ring 8 when the rotation is stopped or the rotation is performed at a low speed is reduced, and the sealing becomes insufficient. Etc. may enter. It is also conceivable to increase the interference of the seal member 11 in consideration of the permanent deformation of the seal member 11 due to centrifugal force. In this case, however, heat generation due to contact friction during low-speed rotation increases, and durability increases. descend.

Accordingly, the object of the present invention is to prevent the seal member from deforming outwardly in the radial direction when the axle rotates at a high speed and floating from the metal ring to avoid heat generation due to the contact of the seal member, and to permanently deform the seal member. Therefore, it is an object of the present invention to provide a railway vehicle bearing device in which the durability of a sealing member is improved by preventing the above.

[0009]

In order to achieve the above object, a bearing device for a railway vehicle according to the present invention has an outer ring, a rolling element, an inner ring, and a base fixed to the outer ring. A first metal ring having a cylindrical portion outward in the direction, a second metal ring having a base fixed to the inner ring, and having a mounting portion extending axially outward with respect to the base, and a mounting portion of the second metal ring. A seal member whose free end contacts the outer peripheral surface of the cylindrical portion of the first metal ring from the outside in the radial direction, and which is directly or indirectly fixed to the inner ring, and extends radially outward from the free end of the seal member. And a stopper for stopping the lifting of the body by a predetermined amount.

[0010]

In the bearing device for a railway vehicle having the above structure, when the axle stops rotating or rotates at a low speed, the free end of the sealing member comes into contact with the outer peripheral surface of the cylindrical portion of the first metal ring, and the sealing member is closed. The member prevents entry of water or the like from the outside. On the other hand, when the axle rotates at a high speed, the seal member is attached to the rotating axle side, so that the free end of the seal member floats outward in the radial direction due to centrifugal force and expands in diameter, thereby causing the first metal ring to expand. No contact with the outer peripheral surface of the cylindrical portion. For this reason, there is no heat generation due to contact friction between the seal member and the first metal ring, and there is no temperature rise, so that the durability of the seal member is improved. The inner peripheral surface of the free end of the seal member is not in contact with the outer peripheral surface of the cylindrical portion of the first metal ring. However, since the axle is rotating at a high speed, water and the like are generated by centrifugal force of the axle. Since the ball is flipped, there is little risk of intrusion through a gap between the seal member and the cylindrical portion of the first metal ring.

When the axle rotates at a higher speed, the diameter of the free end of the seal member increases further. When the free end rises by a predetermined amount, the outer peripheral surface of the free end comes into contact with the stopper. Then, the floating of the sealing member is stopped. As described above, the lift of the free end of the seal member is suppressed to a predetermined amount by the stopper, so that the seal member is not deformed more than necessary and permanent deformation can be prevented. Therefore, when the rotation of the axle is stopped or at low speed, the interference of the seal member is ensured for a long period of time, and the contact pressure between the seal member and the first metal ring is ensured. Can be.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The bearing device for a railway vehicle of the present invention will be described below in detail with reference to embodiments.

FIG. 1 is a sectional view of a main part of a railway vehicle bearing device according to an embodiment of the present invention, in which an outer ring 21, rolling elements (conical rollers) 22,. Is mounted on the axle 27, and a rear cover 26 fixed to the axle 27 is provided on the inner end side of the bearing 25.
And a front lid (not shown) is arranged on the outer end side.

On the other hand, the first metal ring 28 is connected to a base 28a fixed to the inner peripheral surface of the inner end 21a of the outer race 21 and extends radially inward from the base 28a. A bent portion 28b and a cylindrical portion 28c extending inward in the axial direction from the bent portion 28b are formed. The first
The rear cover 26 is provided on the outer peripheral surface of the bent portion 28b of the metal ring 28.
A cover ring 29 that fits loosely into the coronal slit 26a is fixed.

A second metal ring 30 is fitted on the outer peripheral surface of the axle 27, and is fixed between the end of the inner race 23 and the end of the rear cover 26 by a base 30a. Base 30
a from the bent portion 28b of the first metal ring 28 and the cylindrical portion 28
and a cylindrical portion 30b as a stopper that extends in the axial direction outward in the space between the cylindrical portion 30b and the cylindrical portion 30b. A third metal ring 31 is fitted on the inner periphery of the cylindrical portion 30b of the second metal ring 30. The third metal ring 31 has a mounting portion 31a extending outward in the axial direction. The second metal ring 30
And the third metal ring 31 may have an integral structure.

Further, the sealing member 41 is provided with the third member.
Base 41a attached to attachment portion 31a of metal ring 31
And a free end 41b connected to the base 41a and elastically contacting the outer peripheral surface of the cylindrical portion 28c of the first metal ring 28 from the outside in the radial direction, and a rectangular section extending radially outward from the free end 41b. The projection 41c is formed. The outer peripheral surface of the convex portion 41c of the seal member 41 faces the inner peripheral surface of the cylindrical portion 30b of the second metal ring 30 at an interval. In a state where the first metal ring 28 is not provided and the seal member 41 is free, the seal member 41 is free.
The dimension A of the gap between the convex portion 41c and the cylindrical portion 30b of the second metal ring 30 is set so as to be the sum of a predetermined interference of the seal member 41 and a value α having a labyrinth effect.

According to the above configuration, when the axle 27 is stopped rotating or rotating at a low speed, the free end 41b of the seal member 41 is moved by the elasticity of the first metal ring 2
8 contacts the outer peripheral surface of the cylindrical portion 28c to prevent water or the like from entering from outside. On the other hand, when the axle 27 is rotating at a high speed, the seal member 41 is attached to the rotating axle 27 side.
1b rises radially outward by centrifugal force and expands in diameter,
No contact is made with the outer peripheral surface of the cylindrical portion 28c of the first metal ring 28. Therefore, there is no heat generation due to contact friction between the seal member 41 and the first metal ring 28, and there is no temperature rise.
The durability of the seal member 41 is improved. Although the inner peripheral surface of the free end portion 41b of the seal member 41 is not in contact with the outer peripheral surface of the cylindrical portion 28c of the first metal ring 28, the axle 27
Is rotating at a high speed, water and the like are flipped off by the centrifugal force of the axle.

When the axle 27 rotates at a higher speed, the free end portion 41b rises, and the outer peripheral surface of the convex portion 41c of the seal member 41 is brought into contact with the cylindrical portion 3 of the second metal ring 30.
0b, and suppresses further deformation of the seal member 41. On the other hand, the free end 4 of the sealing member 41
The dimension of the gap between 1b and the cylindrical portion 28c of the first metal ring 28 is substantially α, forming a labyrinth seal. As described above, since the lift of the seal member 41 is suppressed to a predetermined amount, the seal member 41 does not undergo large deformation, and permanent deformation can be prevented.

Therefore, when the rotation of the axle 27 is stopped or at a low speed, the interference of the seal member 41 is ensured for a long time, and the seal member 41 and the first metal ring 2 are secured.
Since the contact pressure with the sealing member 8 is ensured, the sealing can be completely performed over a long period of time.

FIG. 2 is a cross-sectional view of a main part of a railway vehicle bearing device according to another embodiment of the present invention. Components identical to those in FIG. 1 are denoted by the same reference numerals. Is omitted. Second metal ring 32 of the railway vehicle bearing device of this embodiment
The base 32 a is fitted to the outer peripheral surface of the axle 27 and is fixed between the end of the inner race 23 and the end of the rear lid 26.
And a mounting portion 32 extending axially outward from the base portion 32a.
b. Further, the annular seal member 42 is free to elastically contact the base 42a attached to the attachment portion 32b of the second metal ring 32 and the outer peripheral surface of the cylindrical portion 28c of the first metal ring 28 from the radial outside. End 42
b. A cylindrical stopper 33 is fixed to the outside of the base 42a of the seal member 42 so as to surround the stopper 33. The stopper 33 extends outward in the axial direction, and is provided with a bent portion 28b and a cylindrical portion 28c of the first metal ring 28. And a bent portion 33a that is bent inward in the radial direction in the space between them. A radially inward end surface of the bent portion 33a of the stopper 33 faces the outer peripheral surface of the free end portion 42b of the seal member 42 at an interval. When the first metal ring 28 is not provided and the seal member 42 is free, the dimension of the gap between the free end 42b of the seal member 42 and the stopper 33 is set to A, which is the same as FIG.

FIG. 3 is a sectional view of a main part of a bearing device for a railway vehicle according to another embodiment of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals. Is omitted. Second metal ring 34 of bearing device for railway vehicle of this embodiment
Has a base portion 34a fitted on the outer peripheral surface of the axle 27, and a mounting portion 34b extending axially outward from the base portion 34a. Further, the annular seal member 43 has a base 43 attached to the attachment portion 34b of the second metal ring 34.
a and a free end 43b connected to the base 43a and elastically contacting the outer peripheral surface of the cylindrical portion 28c of the first metal ring 28 from the outside in the radial direction. The stopper 35 is provided between the end of the inner ring 23 and the base 3 of the second metal ring 34.
4a, and a base 35a fixed and sandwiched between the base 35a and the base 35a, extending outward in the axial direction, and radially inward in the space between the bent portion 28b and the cylindrical portion 28c of the first metal ring 28. And a bent portion 35b that bends into a bent shape. The end face of the bent portion 35a of the stopper 35 facing inward in the radial direction faces the outer peripheral surface of the free end portion 43b of the seal member 43 at an interval. In the state where the first metal ring 28 is not provided and the seal member 43 is free, the dimension of the gap between the free end 42b of the seal member 43 and the stopper 35 is set to the same A as in FIG.

In each of the above embodiments, the seal structure on the rear lid 26 side is used, but it goes without saying that the seal structure on the front lid side can be similarly applied.

Further, the sealing member 41 shown in FIG.
Of course, the dimension A of the gap between the metal ring 30 and the cylindrical portion 30b may be an appropriate dimension. Similarly, FIGS. 2 and 3
The dimension A shown in FIG.

[0024]

As is apparent from the above description, in the bearing device for a railway vehicle of the present invention, the free end of the seal member attached to the second metal ring on the axle side is connected to the cylindrical portion of the first metal ring on the outer ring side. A stopper is provided so as to elastically contact the outer peripheral surface from the radial direction, and stops a predetermined amount of floating of the free end of the seal member.

Therefore, according to the railway vehicle bearing device of the present invention, when the axle rotates at high speed, the free end of the seal member floats due to the centrifugal force. However, the lift is suppressed to a predetermined amount by the stopper. In addition, the seal member is not deformed more than necessary, and permanent deformation can be prevented. Therefore, when the axle is stopped or when rotating at a low speed, the interference of the seal member is stabilized, and a decrease in the contact pressure between the seal member and the first metal ring is prevented. Can be improved in durability.

When the axle rotates at high speed,
Since the seal member is mounted on the rotating axle side, the free end of the seal member rises radially outward due to centrifugal force and expands in diameter. Therefore, the seal member does not contact the first metal ring, and there is no heat generation due to contact friction.
Since there is no rise in temperature, the durability of the sealing member is improved. The inner peripheral surface of the free end of the seal member is not in contact with the outer peripheral surface of the cylindrical portion of the first metal ring. However, since the axle is rotating at a high speed, water and the like are generated by centrifugal force of the axle. Since it is flipped, water or the like does not enter through a gap between the seal member and the cylindrical portion of the first metal ring.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a railway vehicle bearing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a railway vehicle bearing device according to another embodiment of the present invention.

FIG. 3 is a sectional view of an essential part of a railway vehicle bearing device according to another embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a conventional bearing device for a railway vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 ... Outer ring, 22 ... Rolling element, 23 ... Inner ring, 24 ... Cage, 25 ... Bearing, 26 ... Rear lid, 27 ... Axle, 28 ... First
Metal ring, 28c cylindrical part, 30 second metal ring, 30b
Cylindrical part, 31 ... third metal ring, 41 ... sealing member, 41b
… Free end.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B61F 15/20-15/28 F16C 33/76

Claims (1)

(57) [Scope of request for utility model registration] An outer ring, a rolling element, an inner ring, a base fixed to the outer ring, a first metal ring having a cylindrical portion axially outward with respect to the base, and a base fixed to the inner ring; A second metal ring having an attachment portion outward in the axial direction with respect to the base portion; and a second metal ring attached to the attachment portion of the second metal ring, with a free end radially outwardly attached to the outer peripheral surface of the cylindrical portion of the first metal ring. And a stopper fixed directly or indirectly to the inner ring and stopping the floating end of the free end of the seal member outward in a radial direction by a predetermined amount. Bearing device.