JPS6361532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an axial spring device used for a bogie of a train or the like.

As shown in FIG. 3, the axle spring device 1 includes a bogie frame 2 that supports the body of a train, etc., and an axle box that pivotally supports a wheel axle 4 in which a wheel and a shaft are integrated. 3. The axle spring device 1 regulates the relative positions of the axle box 3 and wheel set 4 with respect to the bogie frame 2, and allows the wheel set 4 to bear the weight of the bogie body. Various types of such shaft spring devices have been devised.

The present invention relates to an improvement of the conventionally known cylindrical guide type shaft spring device shown in FIGS. 3 and 4.
As a conventional cylindrical guide type shaft spring device, a shaft spring device 1 shown in FIG. 3 or a shaft spring device 20 shown in FIG. 4 are known. Axial spring device 1 shown in FIG.
are the outer member 11, the inner member 12, and the outer member 11.
A sliding member 13 interposed between the outer member 11 and the inner member 12, and an axial spring 14 provided between the spring seats of the outer member 11 and the inner member 12 are embedded, and the outer member 11 and the inner member 12 It consists of a cylindrical rubber coating 15 provided between each spring seat. In this shaft spring device 1, the force applied between the bogie frame 2 and the shaft box 3 is received by the shaft spring 14, and the lateral force is regulated by the sliding surfaces of the outer member 11 and the inner member 12. A rubber coating 15 is provided to prevent dirt, sand, etc. from entering the sliding member 14 between the outer member 11 and the inner member 12. However, in this conventional shaft spring device, since the rubber coating 15 is located outside the shaft spring 14, the entire shaft spring device becomes large, making it difficult to downsize. Further, since the rubber coating 15 is exposed on the outer circumferential surface, there is a problem in that it can be scratched by flying pebbles and sand. Further, the shaft spring device shown in FIG. 4 includes an outer member 21 and an inner member 22.
In order to protect the sliding member 23 interposed between the two from dirt, sand, etc., a ring-shaped sliding member 2 made of felt is attached to the outer peripheral surface of the tip of the cylindrical head 211 of the outer member 21.
6 and a cylindrical protective cover 25 fixed to the spring seat of the inner member 22. This sliding member 26
By sliding with each other, the protective cover 25 absorbs the displacement caused by the relative movement of the inner member 22 and the outer member 21 in the axial direction, and prevents dirt and the like from entering the outer member 21 where the sliding member 23 is provided. Preventing intrusion. However, even in this conventional shaft spring device, the inside of the outer member 21 is connected to the sliding member 2.
It is only isolated from the outside by the contact resistance between 6 and the protective cover 25. Therefore, if a gap is created between the sliding member 26 and the protective cover 25 due to vibration or the like, sand, dust, etc. will be transferred to the outer member 21 from the gap.
There was a risk of intrusion inside. for that,
There are inherent problems in that the sliding member 23 may be damaged by sand or the like entering the inside, increasing sliding resistance, or the sliding member may be worn out, making it impossible to slide smoothly.

The present invention overcomes the drawbacks of conventional axial spring devices mentioned above. That is, the axial spring device of the present invention includes an outer member having a cylindrical portion with an open end and a flange-like spring seat formed on the outer peripheral surface of the cylindrical portion;
an inner member having a rod-shaped central protrusion inserted into the cylindrical part of the outer member and a flange-shaped spring seat formed on the outer peripheral surface of the central protrusion; and an inner periphery of the cylindrical part of the outer member. In an axial spring device comprising: a sliding member interposed between a surface and an outer peripheral surface of the central portion of the inner member; and an axial spring disposed between a spring seat of the outer member and a spring seat of the inner member. , characterized in that a cylindrical closing member made of a porous elastic material is disposed in a compressed state in the axial direction between the open end of the cylindrical portion of the outer member and the inside of the spring seat of the inner member. It is.

In the shaft spring device of the present invention, the outer member, inner member, sliding member, etc. are completely the same as the outer member, inner member, sliding member, etc. of the conventional cylindrical guide type shaft spring device. In the present invention, a closing member is provided between the outer member and the inner member in order to protect the sliding member from sand, dust, etc. The closing member is arranged in an axially compressed state between the open end of the cylindrical portion of the outer member and the inside of the spring seat of the inner member, and has a cylindrical shape made of a porous elastic material. Since this closure member is made of a poroelastic material, even if an axial displacement occurs between the outer member and the inner member, the cylindrical closure member will not extend in the axial direction.
It is compressed and absorbs the displacement. That is, the hole portion of the porous elastic material constituting the closing member is compressed to absorb displacement. Therefore, even if a large displacement occurs between the outer member and the inner member, the closing member always protects the inside of the outer member 21 and isolates it from the outside. As the porous elastic material constituting this closing member, soft urethane foam or porous rubber is used. The shape of this closing member is cylindrical. The wall thickness of this closure member needs to be thick enough to prevent buckling even when the closure member is compressed in the axial direction. In an axial spring device used in a bogie for a regular train, etc., the thickness of the wall of the closing member is preferably 3 mm or more. Note that the closing member itself is locked between the outer member and the inner member by its compressed reaction force. In order to ensure the connection between one end of the closing member and the cylindrical head tip of the outer member that is in contact with it, the tip of the closing member is connected to the head tip surface of the outer member and the inner circumferential surface or outer periphery that is in contact with the tip of the outer member. It is preferable that it be formed in a stepped or grooved shape so as to be in contact with at least one of the surfaces. Note that a metal engagement member may be fixed to the above-mentioned tip of the closing member, and this engagement member may be engaged with the outer head opening end. In this case, the engaging portion preferably has a ring-shaped groove or a flange-shaped guide surface that engages with the open end of the head of the outer member. The circular end of this closure may be made of metal or synthetic resin. Regarding the surface of the closing member that comes into contact with the inner member, the tip thereof may be similarly formed into a shape along the contact surface of the inner member. In the locking member of the present invention, since the locking member itself is interposed between the outer member and the inner member in a compressed state, no other fixing means is required. However, depending on the application and necessity, it is also possible to bond the locking member to the outer member and the inner member at their contact surfaces using an adhesive or the like.

In the axial spring device of the present invention, the closing member is always interposed between the outer member and the inner member, and the axial displacement of the outer member and the inner member is absorbed by the compressive displacement of the closing member, so that the seal is completely sealed. And garbage,
There is no risk of sand or the like entering the inside of the outer member 21. Furthermore, since the closing member does not have any sliding parts, there is no fear that a gap will be created due to vibration or the like. Furthermore, since the closing member is provided inside the shaft spring, the entire shaft spring device can be configured compactly. Further, since the flying sand and the like are temporarily stopped by the shaft spring, there is less of the flying sand and the like that directly hits the closing member, and there is less risk that the closing member will be damaged by the flying sand and the like.

Examples will be explained below.

FIG. 1 shows a shaft spring device according to a first embodiment of the present invention. This axial spring device has an outer member 31, an inner member 32, a sliding member 33, an axial spring 34, and a closing member 35 as main components. The outer member 31 includes a cylindrical head 311 with an open upper end and a spring seat 312 integrally provided on the outer peripheral surface of the head 311.

The inner member 32 includes a rod-shaped central protrusion 321 inserted into the head 311 of the outer member 31 and a flange-shaped spring seat 322 formed on the upper outer peripheral surface of the central protrusion 321.

The sliding member 33 is a ring-shaped sliding member 331 made of a resin with excellent sliding properties such as polyacetal.
and a cylindrical buffer body 332. The sliding member 331 is inserted along the inner circumferential surface of the cylindrical portion 311 of the outer member 31 and is locked to the inner circumferential surface of the cylindrical portion 311 with a retaining ring 314 . The buffer body 332 has a buffer rubber 3 between an inner sleeve 333 and an outer sleeve 334.
35, the central protrusion 32 of the inner member 32
The inner member 32 is secured to the central protrusion 321 by a presser foot 325 that is fitted onto the outer peripheral surface of the inner member 32 and fixed with a spacer 323 and a bolt 324 at the upper end. The outer member 31 and the inner member 32 are arranged such that the outer circumferential surface of a buffer body 332 held on the outer circumferential surface of the central protrusion of the inner member 32 is fixed to the inner circumferential surface of the sliding member 331. It is possible to slide in the axial direction between and. Further, the force perpendicular to the axial direction of this axial spring device, that is, the force from left to right in FIG. 1, is elastically received by the buffer rubber 335 of the buffer body 332.

The shaft spring 34 is provided between the spring seat 312 of the outer member 31 and the spring seat 322 of the inner member 32, and supports the load applied to the bogie frame.

The closing member 35 consists of a cylindrical main body 351 made of soft urethane foam and a circular metal end 352 bonded to the lower end of the main body 351 with an adhesive.
This circular end portion 352 has an outer circumferential surface protruding outward,
The cross section is L-shaped. Therefore, the whole becomes lid-shaped,
It is adapted to be fitted into the upper end of the cylindrical portion 311 of the outer member 31. Since this closing member 35 is arranged in a compressed state, it is interposed between the outer member 31 and the inner member 32 due to a reaction force against the compression of the closing member 35 itself.

The shaft spring device of this embodiment has the above configuration. Since this axial spring device is interposed between the outer member 31 and the inner member 32 by the compression reaction force of the closing member 35 itself, no special bonding, adhesive, etc. are required. Further, the circular end portion 352 attached to the lower end of the closing member 35 allows the cylindrical portion 311 of the outer member 31 to be easily closed.
Easy to install. Also,
Since the shielding effect on the inside of the outer member 31 is protected by the relatively thick cylindrical urethane foam main body 351, there is almost no fear that dust, dirt, etc. will break through the closing member and enter the inside. Therefore, the sliding member 33 held inside the outer member 31 is not damaged by dust, sand, etc., and always maintains its predetermined function. In addition, the closing member 35
is located inside the shaft spring 34, so the entire shaft spring device becomes compact.

Example 2 A cross-sectional view of the shaft spring device of this example is shown in FIG. This axial spring device has an outer member 41, an inner member 42, a sliding member 43, an axial spring 44, and a closing member 45 as main components.

This shaft spring device is similar to the shaft spring device shown in Example 1, but differs in the spring seat and closing member.
That is, in the shaft spring device of this embodiment, the spring seat 44
A cushioning rubber ring 443 is disposed between the outer member 41 and the outer member 41 .

The closing member 45 is made of one piece of soft urethane foam, and a ring-shaped groove that engages with the tip of the cylindrical portion of the outer member 41 is formed on the lower end surface of the closing member 45 . The tip of the cylindrical portion of the outer member 41 is inserted into this ring-shaped groove, and the two are strongly connected.

In the shaft spring device of this embodiment, the closing member 45 is made of soft urethane foam in one piece, so the number of component parts is reduced and simplified compared to the closing member 35 used in the shaft spring device of Example 1. There is.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an axial spring device according to a first embodiment of the present invention, FIG. 2 is a sectional view of an axial spring device according to a second embodiment of the invention, and FIG. 3 is a sectional view of a conventional axial spring device. FIG. 4 is a cross-sectional view of a main part of the truck used, and FIG. 4 is a cross-sectional view of a conventional shaft spring device. 1... Axle spring device, 2... Bogie frame, 3... Axle box, 4...
Wheel, 11, 21, 31, 41...Outer member, 1
2, 22, 32, 42...inner member, 13, 23,
33, 43...Sliding member, 14, 24, 34, 44
... Axial spring, 35, 45... Closing member.

Claims (1)

[Scope of Claims] 1. An outer member having a cylindrical portion with an open end and a flange-like spring seat formed on the outer peripheral surface of the cylindrical portion, and a rod-shaped spring seat inserted into the cylindrical portion of the outer member. an inner member having a central protrusion and a flange-shaped spring seat formed on an outer peripheral surface of the central protrusion; an inner peripheral surface of the cylindrical portion of the outer member and an outer periphery of the central protrusion of the inner member; In an axial spring device comprising: a sliding member interposed between surfaces; and an axial spring disposed between a spring seat of the outer member and a spring seat of the inner member, the opening end of the cylindrical portion of the outer member; An axial spring device characterized in that a cylindrical closing member made of a porous elastic material is disposed in a compressed state in the axial direction between the inner member and the inner side of the spring seat. 2. The shaft spring device according to claim 1, wherein the porous elastic material constituting the closing member is a soft urethane foam. 3. The circular end of the closing member that contacts the open end of the cylindrical portion of the outer member has a circular stepped shape or a circular end that abuts the tip surface of the open end of the cylindrical portion and at least one of the upper outer surface and the upper inner surface connected to the tip. The shaft spring device according to claim 1, which has a circular groove shape. 4. The shaft spring device according to claim 3, wherein the circular end portion of the closing member is made of metal or synthetic resin.