JP2000065078A - Rolling bearing for rolling stock axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing for a rolling stock axle, in which a center hole having a cap structure causing no loosening by the rotation, having a low machining cost and easy for detaching, can be exposed. SOLUTION: In the roller bearing for a rolling stock axle, having a shaft 1 in which a center hole 1d is provided on the shaft end, a bearing 2 in which inner rings 2a are fixed to the shaft and an outer ring 2b is fixed to an axle box, seals 5 provided on both ends of the bearing, and a front cover 4 for covering the bearing, the seals and the shaft end side of the shaft extending from the baring, an exposable central hole 7 is provided in the central part of the front cover 4. A cap 8 is provided to have the outer peripheral projecting part 8b to be detachably fitted to the central hole inner periphery 7a and a circumferential groove 7b and made of an elastic material having a recessed section, and a plate-shaped gripping part 9 having its one side 9a to be connected to the cap outer peripheral inner wall 8e and its other side to be fitted in the radial direction of the bottom part 8f is provided on the outer peripheral inner wall side from the cap central part 8g. Moreover, the gripping parts are symmetrically arranged, and the central part is thickened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention covers a hole provided for exposing a center hole at an axle end of a roller bearing device for a railway vehicle axle in which an inner ring is fixed to an axle and an outer ring is fixed to an axle box side. For a cap structure.

2. Description of the Related Art Conventionally, in a roller bearing device for a railway vehicle axle, which includes a bearing in which an inner ring is fixed to an axle and an outer ring is fixed to an axle box or the like, a seal or a front cover is provided to protect the axle end and the bearing. The axle end is protected from the outside. However, in order to grind the treads of the wheels worn by driving, a center hole provided at the end of the axle is exposed, and the axle is supported by the center hole. Therefore, in Japanese Utility Model Laid-Open No. 5-25023, a cover made of rubber, plastics, or the like is provided to cover the shaft end, and the shaft end is exposed by removing the cover. However, this is large because it covers the entire shaft end. In addition, since the stone is large, the hit rate of a flying stone or the like is high, and the probability of breakage increases. Further, there is a problem that the cost is increased.

[0003] On the other hand, in Japanese Utility Model Publication No. 46-20980, a center hole is simply provided in the front lid, and a plug is screwed into the center hole so that the center hole can be exposed. However, in this case, there is a problem that the screw processing is necessary and the cost is high, and since the screw structure is used, it takes a long time to remove. In addition, a detent was required to prevent loosening due to rotation.

[0004]

Therefore, instead of the latter screw structure, the former rubber cover may be provided in the center hole of the latter, but the former cover has a complicated structure as described above, and the cover has a complicated structure. Exposed parts are easily damaged and costly, and if the fitting part is strengthened to strengthen the prevention of falling off during use, it will be more difficult to remove than the screw structure, requiring more power, and However, there is a problem that the material may be damaged.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a roller bearing device for a railway vehicle axle capable of exposing a center hole, which has no loosening due to rotation, has a low processing cost, and is easy to remove. A roller bearing device for a railway vehicle axle having the same.

[0006]

Means for Solving the Problems Accordingly, the present inventors have
Instead of covering like the former, a type that inserts a cap with a concave cross section with less external exposure into the hole, especially a peripheral groove is provided in the center hole to strengthen the fitting of the cap, and a convex that fits into this peripheral groove Various experiments were conducted by inserting a rubber-made cap having a concave section on the outer periphery. The center hole of the railcar axle is large, and the center hole for exposing the center hole has a diameter of 5 mm.
It becomes a large hole of about 0 mm, and it is firmly fitted so that the cap inserted in the hole cannot be removed with bare hands. In this case, the use of a flathead screwdriver easily damages the cap, making it difficult to reuse it. Therefore, a part of the cap is pulled up by a plier or the like. It is not preferable to provide a grip portion on the outer peripheral portion to pull up the outer peripheral portion of the cap, since the number of protrusions to the outside increases. In addition, there is a possibility that the deformation of the outer peripheral portion becomes large and it becomes difficult to re-use the same as with a flathead screwdriver.

In view of the above, a plate-like grip portion is provided at the bottom to lift the cap. However, the cap extends only at the center of the bottom surface, the outer peripheral portion is less deformed, and the cap is hard to come off and a considerable force is required. On the other hand, it has been found that when a plate-shaped grip portion is provided on the outer peripheral side of the cap and the cap is pulled up, the cap is easily detached.

Based on this finding, the present invention provides:
A shaft with a center hole at the shaft end, a bearing with the inner ring fixed to the shaft and an outer ring fixed to the shaft box, etc., seals provided at both ends of the bearing, a bearing, a shaft extending from the seal and the bearing A front cover adapted to cover the shaft end side of the roller bearing device for a railway vehicle axle, wherein a center hole in which a center hole can be exposed is provided at a central portion of the front cover, and a peripheral groove is further provided on the inner periphery of the center hole. A cap made of a resilient material having a concave cross section is provided in which the outer convex portion is fitted to the inner periphery and the peripheral groove of the center hole and is detachable. Further, the above-mentioned problem has been solved by providing a plate-like grip portion in which one side is connected to the inner peripheral wall of the cap and the adjacent side is connected in the bottom radial direction.

As described above, the closer the plate-shaped grip portion is to the inner peripheral wall, the easier it is to separate from the hole. Therefore, the plate-shaped grip portion is provided on the outer peripheral inner wall side from the center portion of the cap.

It is sufficient that the grip portion is only one. However, in consideration of long-term use, breakage of the grip portion due to repeated attachment / detachment, balance as a rotating body, flow of rubber material at the time of molding, etc. It is preferable that the grip portion is a single plate symmetrically arranged with respect to the center of the cap, and two grip portions are provided symmetrically with respect to the center.

In the case where the grip portion is formed as a single plate as described in claim 3, the central portion may be gripped and pulled. In such a case, an extra force is required and the operation is not appropriate. Therefore, a thick portion is provided at the center to indicate that the grip portion is on the outer peripheral wall side. Also, the flow of the rubber material and the like during molding is improved.

[0012]

Embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of a roller bearing device for an axle of a railway vehicle according to the present invention, FIG. 2 is a front view of the cap shown in FIG. 1, (b) is a cross-sectional view taken along line AA of (a),
(C) is a sectional view taken along line BB of (a). In FIG. 1, an axle 1 a of a railway vehicle axle 1 abuts a step portion 1 b on an opposite shaft end side flange portion 3 a, an inner ring 2 a of a tapered roller bearing 2, a spacer 2 e,
The inner ring 2a and the shaft end side flange portion 3b are fitted in this order, and are fixed in the axial direction by bringing the front cover 4 provided at the shaft end into contact with the shaft end side flange portion. The front cover 4 is biased and fixed in the axial direction by screwing three bolts 11 into a screw hole 1c provided at the shaft end. An outer ring 2b is provided via a tapered roller 2c corresponding to the inner ring 2a, and the outer ring is fixed to an underframe or the like via an axle box (not shown), and the axle 1 is rotatable.

An annular bearing seal 5 is provided at both ends 2f of the outer race 2b via a mounting cover 6. The inner peripheral seal portion of the bearing seal 5 is slidably rotatable around the outer periphery of the opposite shaft end side flange portion 3a and the shaft end side flange portion 3b. A center hole 1d is formed in the shaft end of the shaft 1. A center hole 7 is provided at the center of the front lid 4 so that the center hole 1d can be exposed. A circumferential groove 7b is provided in an inner circumference 7a of the center hole 7. A cap 8 is inserted into the center hole 7.
As shown in FIG. 2, the cap 8 has a concave cross section,
An outer peripheral surface 8a is provided with an outer peripheral convex portion 8b, the outer peripheral surface is elastically fitted to the inner peripheral surface 7a of the center hole 7, and the outer peripheral convex portion is fitted and fitted into the peripheral groove 7b.

A flange 8c is provided along the outer periphery of the open end of the cap, and is brought into contact with the open end face 7c of the center hole 7. Inside the concave portion 8d, there is provided a plate-like grip portion 9 in which one side 9a is connected to the inner wall 8e of the cap and the adjacent side 9b is connected in the radial direction of the bottom portion 8f. It is provided on the inner wall 8e side. Note that an elastic material having elasticity such as rubber or plastic is used as the cap material. More preferably, urethane rubber or the like, which is also used in the above-mentioned conventional cover, is suitable in terms of weatherability, life, and strength. When the diameter D of the center hole 7 is 50 mm, the overall cap length L is 14 mm, the outer diameter D1 of the flange 8c is 53 mm, the height H1 is 2 mm, and the protrusion 8b is provided.
Height h = 0.5 mm, convex part width w = 1.5 mm, width Wt of grip part 9 = 2 mm, height Ht = 10 mm, length Lt =
It was 15 mm.

In the roller bearing device for a railway vehicle axle, the bearing 2 is protected from flying stones, rainwater, dust and the like by bearings 5 extending on both sides of the outer ring. In addition, the shaft end 1a has an opposite shaft end side flange portion 3a, the inner ring 2a of the tapered roller bearing 2,
The spacer 2e, the inner ring 2a, the shaft end side flange 3b, the front lid 4, and the cap 8 inserted into the front lid center hole 7 are hermetically sealed and protected from flying stones, rainwater, and dust. The cap 8 has the outer circumferential projection 8b firmly fitted in the circumferential groove 7b, so that there is no risk of falling off or being accidentally removed.

When the center hole 1d is used at the time of repair or the like, the center hole 1d can be easily removed by holding and pulling the plate-like grip portion 9 of the cap 8 with a plier or the like. Even if a force in the rotating direction is applied to the grip portion 9 or the outer peripheral flange portion 8c is pulled, it cannot be easily removed.

Next, another embodiment will be described.
FIGS. 3A and 3B show a single plate in which two grip portions of the cap to be inserted into the center hole 7 of FIG. 1 are arranged symmetrically with respect to the center of the cap. FIG. 3A is a front view, and FIG. (A) is a sectional view taken along line AA, and (c) is a sectional view taken along line BB in (a). FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted. In the case of FIG. 2, the grip portion 9 is provided at two places. 10 is continuously connected between the grip portion and the grip portion,
As shown, a single plate-like portion 11 is formed.

In this configuration, the grip portion 9 is provided at two places, is symmetrical about the center, has a good rotational balance, and can be removed even if one of the grip portions is damaged due to repeated use and detachment for a long period of time. . If rubber or the like is supplied from the center 12 by connecting between the grip portions 10, the flow of the rubber material or the like at the time of molding is good. It should be noted here that the grip 9
Means that it is on the side of the outer peripheral inner wall 8e from the center and not between the gripping portions (connection portion) 10. If between the grips 1
It is difficult to easily remove the cap 8 from the center hole 7 simply by extending the center even if the area around 0 is pinched by a pliers or the like, and it is several times as large as when the grip on the outer peripheral inner wall side is clamped. It needs the power of

That is, the connecting portion 10 cannot serve as the grip portion 9. Therefore, the central portion is formed into a columnar shape having a diameter of about 5 mm to 10 mm, and a thick portion is provided at the central portion to make it difficult for the pliers or the like to hold the thick portion so as to call attention to an operator. In this case, there is an effect that the flow of the rubber material at the time of molding is made more reliable.

The grips may be further arranged in a cross shape to provide four places, but if the number is increased, the ribs function as ribs, making it difficult for the entire cap to be deformed, making attachment and detachment hard, and increasing the cost. Therefore, about two places are good. In the above description, the roller bearing device for a railway vehicle axle as shown in FIG. 1 has been described. However, a shaft having a center hole at the shaft end, an inner ring fixed to the shaft, and an outer ring mounted to an axle box or the like. For a railway vehicle axle having a fixed bearing, seals provided at both ends of the bearing, and a front lid adapted to cover the shaft end side of the bearing, the seal and a shaft extending from the bearing. It goes without saying that the same applies to various forms of the roller bearing device.

When the center hole 7 has a diameter D = 50 mm
Various experiments were conducted for the cap of
Urethane rubber is manufactured by NOK Iron Rubber 80
0 series U801 (hardness JIS A 94, 100%
Modulus 130 kg / cm ^Two, 300% modulus 2
00kg / cm^Two, Tensile strength 440kg / cm^Two, Growth 4
80%, tear strength 140kg / cm, rebound resilience 40
%, Compression set 30% 80 ° C. × 70 Hrs).

[0022]

As described above, in the roller bearing device for a railway vehicle axle according to the present invention, the center hole of the front cover provided at the shaft end having the center hole, the inner periphery of the center hole and the outer periphery of the peripheral groove are provided. A cap made of a resilient material having a concave cross section that is fitted and detachable with a convex portion is provided, and a plate-like grip portion is formed in which one side is connected to an outer peripheral inner wall of the cap and an adjacent side is connected to a bottom radial direction. Provided is a roller bearing device for a railway vehicle axle that has a cap structure that has a cap structure that is easily fitted in an attached state, has no looseness due to rotation, has a low processing cost, and is easy to operate when being removed because the detachment from a hole is facilitated. It became something to do.

By providing the plate-like gripping part on the outer peripheral inner wall side from the center part of the cap, it can be more easily removed.

Further, since the plate-like grip portion is provided in two places in the form of a single plate arranged symmetrically with respect to the center of the cap, it is possible to cope with damage to the grip portion due to long-term use and repeated attachment and detachment. The balance as well as the maintenance was good. In addition, the flow of the rubber material and the like was good at the time of cap molding, and it was easy to manufacture.

Further, if a thick portion is provided at the center to make it difficult for the pliers or the like to pinch it and to alert the operator, the effects such as easier handling can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a roller bearing device for a railway vehicle axle, showing an embodiment of the present invention.

2 (a) is a front view of the cap shown in FIG. 1, and FIG. 2 (b) is an AA of FIG. 1 (a).
FIG. 3C is a sectional view taken along line BB of FIG.

FIG. 3 is another embodiment of the cap of the present invention,
(A) is a front view, (b) is a sectional view taken along line AA of (a),
(C) is a sectional view taken along line BB of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Railway vehicle axle 1a Shaft 1b Step part 1d Center hole 2 Roller bearing (tapered roller bearing) 2a Inner ring 2b Outer ring 2c Roller (tapered roller) 2e Spacer 2f Both ends of outer ring 3a Non-shaft end side flange 3b Shaft end side flange Reference Signs List 4 Front lid 5 Bearing seal 6 Mounting cover 7 Center hole 7a Inner circumference of center hole 7b Peripheral groove 8 Cap 8a Cap outer peripheral surface 8b Cap outer peripheral convex part 8d Inside of cap concave part 8e Cap outer peripheral inner wall 8f Cap bottom part 8g Cap central part 9 Gripping part 9a One side of the gripping part 9b Adjacent side of one side of the gripping part 10 Between the gripping parts 11 One sheet-like part

Claims (4)

[Claims] A shaft having a center hole at the shaft end; a bearing having an inner ring fixed to the shaft and an outer ring fixed to a shaft box or the like;
A roller bearing device for a railway vehicle axle, comprising: a seal provided at both ends of the bearing; and a front lid configured to cover a shaft end side of the bearing, the seal, and a shaft extending from the bearing. A center hole where the center hole was exposed was provided at the center of the front lid, a peripheral groove was provided on the inner periphery of the center hole, and an outer peripheral convex portion was fitted on the inner periphery and the peripheral groove of the front hole to be detachable. A cap made of an elastic material having a concave cross section is provided, and the cap is provided with a plate-like grip portion having one side connected to the inner wall of the cap outer circumference and the adjacent side connected to the bottom radial direction. Roller bearing device for railway vehicle axles. 2. The roller bearing device for an axle of a railway vehicle according to claim 1, wherein the plate-shaped grip portion is provided on an outer peripheral inner wall side from a center portion of the cap. 3. The roller bearing device for an axle of a railway vehicle according to claim 2, wherein said plate-shaped grip portion is arranged symmetrically with respect to the center of the cap and is formed in one plate shape. 4. The roller bearing device for a railway vehicle axle according to claim 3, wherein the single plate-shaped grip portion according to claim 3 is provided with a thick portion at a central portion. .