JPH071281Y2 - Shaft end plug mounting structure for hollow axles for railway vehicles - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a shaft end plug mounting structure for closing a shaft end of a hollow axle for a railway vehicle.

[Conventional technology]

BACKGROUND ART Conventionally, a hollow axle for a railway vehicle is screwed into a shaft end 1a of a hollow axle 1 as shown in FIGS. 7 and 8 in order to prevent rust preventive oil applied to the inside of the hollow axle from leaking. It is closed by the shaft end plug 2 of the formula.

This includes forming a key groove 1b on the shaft end 1a of the hollow axle 1, forming a female screw portion 1c on the inner peripheral wall of the shaft end 1a, and inserting a male screw portion 2a formed on the outer peripheral wall of the shaft portion of the shaft end plug 2 into a female screw. The shaft end 1a of the hollow axle 1 is closed by being screwed into the portion 1c, and the screwed shaft end plug 2 is fitted in the key groove 1b in order to prevent the shaft end plug 2 from turning to the loose side due to vibration during traveling. The rotation stopping member 3 is attached to the outer end surface of the shaft end plug 2 with screws 4, 4.

[Problems to be solved by the device]

However, in the above-mentioned configuration, when the shaft end plug is attached / detached at the time of assembling the vehicle or performing the periodical inspection, it is necessary to perform a complicated work of tightening the detent member, which is troublesome, and a plurality of vehicles are knitted and operated. In some cases, there are inconveniences such as the inspection taking a long time.

In view of this, the present invention provides a shaft end of a hollow axle for a railroad vehicle having a structure in which the shaft end plug can be easily attached and detached, the work time for inspecting the inside of the hollow axle can be shortened, and the shaft end plug does not fall off. It is intended to provide a plug mounting structure.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is configured such that a female screw portion formed on an inner peripheral wall of a shaft end portion of a hollow axle is screwed with a male screw portion formed on an outer peripheral wall of a shaft portion of a shaft end plug, and the hollow end is formed by the shaft end plug. In a shaft end plug mounting structure for a hollow axle for a railway vehicle that closes the shaft end of the axle, an annular recess having a diameter larger than the inner diameter of the female screw portion is formed on the inner peripheral wall on the inner side of the female screw portion of the hollow axle. An elastic body is attached to the shaft portion on the tip side of the male screw portion of the plug so as to protrude from the outer diameter of the male screw portion, and the elastic body is fitted into the annular recess.

[Action]

With this configuration, when the shaft end plug is screwed into the hollow axle, the elastic body attached to the shaft end plug is elastically deformed as the shaft end plug rotates, and the female screw portion of the hollow axle is deformed. After passing through the female screw portion, the elastic deformation is released and the elastic member is fitted into the annular recess on the inner side of the female screw portion while protruding from the outer diameter of the male screw portion.

As a result, even if the shaft end plug tries to rotate toward the loose side due to vibration during traveling, the elastic body comes into contact with the threads of the female threaded portion to restrict the rotation of the shaft end plug. Then, the resistance due to the deformation of the elastic body continues to act as a rotation stopper for the shaft end plug in the entire process of the female screw portion.

Further, when the screwing of the shaft end plug to the hollow axle shaft is completed, the elastic body is not subjected to additional deformation such as compression, so that it is possible to prevent the settling and to maintain the retaining function for a long period of time.

Further, when the shaft end plug is removed, torque is applied to the shaft end plug in the direction opposite to the direction when the shaft end plug is rotated to rotate the elastic body, and the elastic body is elastically deformed to pass through the female screw portion.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

1 to 3 show a first embodiment of the present invention, in which a hollow axle 10 for a railway vehicle has a female screw portion 10b formed on an inner peripheral wall of a shaft end 10a, and the inner portion of the female screw portion 10b. An annular recess 10c having a diameter larger than the inner diameter of the female screw portion 10b is formed on the inner peripheral wall on the side. The annular recess 10c also serves as an escape groove for a cutting tool necessary for threading the internal threaded portion 10b, and suppresses an increase in the number of steps for threading the internal threaded portion.

The shaft end plug 11 that closes the shaft end 10a of the hollow axle 10,
Shaft 11a and head flange 11b having a larger diameter than the shaft 11a
And a male screw portion 11c screwed to the female screw portion 10b is formed on the outer peripheral wall of the shaft portion 11a.

In addition, the shaft end 11a on the tip side of the male screw part 11c has a shaft end plug.
An annular recess 11d corresponding to the annular recess 10c is formed adjacent to the male screw portion 11c when screwing of the hollow axle 11 is completed.
An O-ring 12 having a circular cross section, which is an elastic body, is fitted and attached to the annular recess 11d.

The relationship between the width and the depth of the O-ring 12 and the annular recess 11d is that the O-ring 12 has an outer diameter larger than the outer diameter of the male screw portion 11c in a normal state where the O-ring 12 is attached to the annular recess 11d. The O-ring 12 is elastically deformed to pass through the female screw portion 10b while passing along the shaft end plug 11 while passing therethrough.

On the outer end surface of the head flange portion 11b of the shaft end plug 11,
A jig engaging hole 11e for attaching / detaching the shaft end plug 11 to / from the hollow shaft 10,
11e is provided.

When the shaft end plug 11 configured as described above is mounted on the hollow axle 10, a jig (not shown) is engaged with the jig engaging holes 11e, 11e of the shaft end plug 11 to form the hollow axle 10. When screwed into
As shown in FIG. 2, the ring 12 elastically deforms and passes through the entire female screw portion 10b of the hollow axle 10 by the rotation torque of the shaft end plug 11, and after passing, as shown in FIG. It reaches the position of the annular recess 10c on the inner side of the portion 10b, the elastic deformation is released, and the elastic recess 11c protrudes from the outer diameter of the male screw portion 11c and is fitted into the annular recess 10c.

In this state, even if the shaft end plug 11 tries to rotate toward the loose side due to vibration during traveling, the O-ring 12 comes into contact with the innermost thread of the female screw portion 10b to restrict the rotation of the shaft end plug 11, It can play the role of a rotation stopping member. Further, even if the vibration during traveling is severe and a large force that elastically deforms the O-ring 12 acts and the shaft end plug 11 tries to turn to the loose side,
Since the resistance due to the elastic deformation of the O-ring 12 continues to act as a frictional force in the entire process of the female screw portion 10b and plays the role of a rotation stopping member, the shaft end plug 11 does not actually fall off.

Also, when screwing of the shaft end plug 11 to the hollow axle 10 is completed,
Since the O-ring 12 does not undergo additional deformation such as compression,
Settling is prevented and the retaining function can be maintained for a long time.

Further, when the shaft end plug 11 is intentionally removed, a required torque is applied by a jig (not shown) to rotate the shaft end plug 11 in the direction opposite to that when the O-ring 12 is screwed.
Since it can be elastically deformed to pass through the female screw portion 10b, the shaft end plug 11 can be easily removed from the hollow axle 10.

Therefore, while ensuring a sufficient retaining function for a long period of time,
Since the shaft end plug 11 can be easily attached to and detached from the hollow axle 10, the work can be performed in a short time even at the time of the periodic inspection for organizing and operating a plurality of railway vehicles.

Further, the outer peripheral portion and the inner peripheral portion of the O-ring 12 at the time of assembly shown in FIG. 3 slightly press-contact with the annular recesses 10c and 11d, respectively, to enhance the prevention of leakage of rust preventive oil in the hollow axle 10. You can

FIG. 4 shows a second embodiment of the present invention.
Instead of the O-ring 12 having a circular cross section in the embodiment, an O ring having a square cross section is used.
Since the ring 13 is fitted to the shaft end plug 11 as an elastic body, the same function and effect as those of the first embodiment can be produced.

The O-rings used in both of the above examples can be easily replenished because ordinary rubber commercial products can be used. Further, urethane rubber may be used as the material of the O-ring in order to increase the resistance to loosening.

FIG. 5 shows a third embodiment of the present invention, in which the shaft end plug 11 is
Male screw 11c Radial bottomed hole 11f in shaft 11a on the tip side
And a rod-shaped elastic body 14 projecting from the outer diameter of the male screw portion 11c is planted and attached to the hole 11f.
By fitting 14 into the annular recess 10c of the hollow axle 10, rotation of the shaft end plug 11 due to vibration or the like during traveling is restricted.

FIG. 6 shows a fourth embodiment of the present invention, which is a shaft end plug.
11 is a through hole 11 in the radial direction in the shaft portion 11a on the tip side of the male screw portion 11c.
A bar-shaped elastic body 15 protruding from the outer diameter of the male threaded portion 11c is inserted into the through hole 11g and attached to the through hole 11g, and the bar-shaped elastic body 15 is fitted into the annular recess 10c of the hollow axle 10. The attachment restricts the rotation of the shaft end plug 11 due to vibration during traveling.

[Effect of device]

As described above, the shaft end plug mounting structure for a hollow axle for a railroad vehicle of the present invention has an annular recess having a diameter larger than the inner diameter of the female screw portion formed on the inner peripheral wall on the inner side of the female screw portion of the hollow axle. Since the elastic body is attached to the shaft portion on the tip side of the female screw portion of the shaft end plug that closes the end so as to protrude from the outer diameter of the male screw portion, and the elastic body is fitted into the annular recess, the shaft is adopted. When the end plug is screwed onto the hollow axle, the elastic body attached to the shaft end plug passes through the female screw portion of the hollow axle while elastically deforming as the shaft end plug rotates, and after passing through the female screw portion, elastically deforms. Is released and protrudes from the outer diameter of the male screw portion and is fitted into the annular portion on the inner side of the female screw portion.

As a result, even if the shaft end plug tries to rotate toward the loose side due to vibration during traveling, the elastic body comes into contact with the threads of the female threaded portion and restricts the rotation of the shaft end plug, and the elastic body is deformed and the female threaded Even if it is pulled out to a part, the resistance due to elastic deformation of the elastic body continues to act as frictional force in the entire process of the female screw part and plays a role of a rotation stop member, so that the shaft end plug does not actually come off. .

Further, when the screwing of the shaft end plug to the hollow axle shaft is completed, the elastic body is not subjected to additional deformation such as compression, so that it is possible to prevent the settling and to maintain the retaining function for a long period of time.

Furthermore, when the shaft end plug is intentionally removed, the required torque is applied by a jig and the shaft end plug is rotated in the opposite direction to that when screwed, and the elastic body is elastically deformed to facilitate the female screw portion. Since it can be passed, the shaft end plug can be easily removed from the hollow axle.

Therefore, the retaining function can be sufficiently secured for a long period of time, and it does not take time to attach and detach the shaft end plug, and the work time can be shortened even at the time of a periodic inspection in which a plurality of railway vehicles are organized and operated. Moreover, the number of the rotation preventing parts is small, the structure is simple and the cost can be reduced.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a perspective view of a shaft end plug, FIG. 2 is a sectional view showing a process of screwing the shaft end plug, and FIG. FIG. 4 is a sectional view showing a screwed state of the shaft end plug, FIG. 4 is a front view showing a second embodiment of the shaft end plug, and FIG. 5 is a partial sectional front view showing a third embodiment of the shaft end plug. , FIG. 6 is a partially sectional front view showing a fourth embodiment of the shaft end plug, FIGS. 7 and 8 are conventional examples, FIG. 7 is a side view, and FIG. 8 is a sectional view. is there. 10: Hollow axle, 10a: Shaft end, 10b: Internal thread, 10c
…… Annular recess, 11 …… Shaft end plug, 11c …… Male thread, 1
2,13 …… O-ring, 14,15 …… Bar-shaped elastic body

Claims (1)

[Scope of utility model registration request] 1. A male screw portion formed on an outer peripheral wall of a shaft portion of a shaft end plug is screwed into a female screw portion formed on an inner peripheral wall of a shaft end portion of the hollow axle, and the shaft end plug is used to form a shaft end of the hollow axle shaft. In a shaft end plug mounting structure of a hollow axle for a railway vehicle that closes the inner peripheral wall of the hollow axle on the inner side of the female screw portion of the hollow axle, an annular recess having a diameter larger than the inner diameter of the female screw portion is formed, and the male screw portion of the shaft end plug is formed. A shaft end plug mounting structure for a hollow axle for a railway vehicle, characterized in that an elastic body is attached to the shaft portion on the tip side so as to protrude beyond the outer diameter of the male screw portion, and the elastic body is fitted into the annular recess.