JPS6233111B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an axle box support device for a bogie for a railway vehicle, and particularly to an axle spring used therein.

[Background of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Different embodiments of the prior art of an axle box support device for a bogie for a railway vehicle are shown in FIGS. 1 and 2, respectively. In FIG. 1, a bogie frame 1 is supported on an axle box body 2 using a synthetic spring in which a coil spring 4 is covered with a vibration-proof rubber 3. The spring constant of this composite spring in the vertical direction can be selected to any desired value, but the spring constant in the longitudinal and lateral directions is too soft due to the collapse of the coil spring and cannot be used for positioning the axle box body 2.
Generally, the pedestal 5 is made to protrude further and the axle box 2 is positioned by sliding the axle box 2 and the pedestal 5.

Figure 2 shows a rubber spring in which anti-vibration rubber 8 is vulcanized and bonded between a partially conical outer cylinder 7 and a partially conical core 9. Vertical spring characteristics are obtained by the wedge effect associated with the directional movement, and the spring constants in the longitudinal and lateral directions are also set high by the anti-vibration rubber 8, and the positioning of the axle box 11 is also performed. 6 is a truck frame, and 10 is a nut.

In the method shown in Fig. 1, the upper and lower spring constants can be made soft or hard as necessary, and there is a high degree of freedom in setting the spring constants, but in addition, members such as the pedestal 5 for positioning the axle box body 2 are used. The drawback was that the structure of the truck was complicated.

In addition, in the method shown in Fig. 2, the vertical, front and rear, and left and right spring effects are obtained using only rubber springs, and the axle box 11
Since no other device is used for positioning, the structure is extremely simple. However, due to the performance of the rubber, it is not possible to take a large amount of deflection of the anti-vibration rubber 8, especially in the vertical direction, which can lead to problems such as increased ride quality, increased chatter vibration, and increased wheel unloading. Due to its problems, it was rarely used for anything other than special vehicles.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an axle box support device that has no sliding parts, has a simple structure, and allows the spring constant to be set to an arbitrary value and is easy to handle.

[Summary of the invention]

The main point of the present invention is that it combines the performance of a conventional rubber spring with the performance of a metal coil spring, and is characterized by a high degree of freedom in setting the spring constant and a simple structure.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIG. The outer cylinder 13 has a partially conical shape, and has a flange at the upper end for attachment to the bogie frame 12. Dolly frame 12
Attachment is carried out using bolts (not shown) or the like. The core metal 16 is sufficiently thinner than the inner diameter of the outer cylinder 13 and has a partially conical shape, and its lower end is fixed to the axle box body 17 with bolts (not shown), and
It has a length sufficient to overlap with 3.
The coil spring 15 is covered with a vibration isolating rubber 14, and the outer diameter side of this synthetic spring is precompressed by the outer cylinder 13 and positioned on the bogie frame 12 side.
The inner diameter side is preloaded by a mandrel 16 and positioned on the axle box body 17 side.

The rubber spring configured as described above is used for the shaft box body 1.
7 and performs spring action and positioning of the axle box body 17. However, since a coil spring 15 is embedded inside the vibration isolating rubber 14, a portion of the vertical load is borne by the coil spring 15. As a result, the load on the vibration isolating rubber 14 is reduced, which extends the life of the rubber and increases the degree of freedom in design, allowing the upper and lower spring constants to be made sufficiently soft.

Further, since the positioning of the axle box body in the longitudinal and lateral directions is performed by the vibration isolating rubber 14 between the outer cylinder 13 and the mandrel 16, no other parts are required, resulting in a very simple structure. The notch 22 is provided to make the rigidity in the left-right direction somewhat softer than that in the front-back direction.

FIG. 4 shows another embodiment, in which the outer cylinder 18 and the mandrel 2
1. The coil spring 20 is integrally vulcanized and bonded with the vibration isolating rubber 19, and its function and effect are the same as the embodiment shown in FIG.

In the above embodiments, an elastic body such as a polymer elastomer may be used in place of the vibration-proof rubber, and although both the outer cylinder and the core are partially conical, this is not the case. It is also possible to use a cylindrical or cylindrical shape.

〔Effect of the invention〕

Since the present invention is as described above, it has the advantage of providing an axle box support device that has no sliding parts, has a simple structure, allows the spring constant to be selected to an arbitrary value, and is easy to handle. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of an axle box support device according to the prior art, FIG. 2 is a longitudinal sectional view of another embodiment, and FIG. 3 is a longitudinal sectional view of an embodiment of an axle box support device according to the present invention. FIG. 4 is a longitudinal sectional view of the same other embodiment. 13, 18... Outer cylinder, 14, 19... Anti-vibration rubber, 15, 20... Coil spring, 16, 21...
Core metal, 17...Axle box body, 22...Notch.

Claims (1)

[Scope of Claims] 1. A cylindrical body is formed by covering a metal coil spring with an elastic body, and the outer periphery of one end of the cylindrical body is arranged so as to apply a preload displacement in the direction of reducing the outer diameter of the cylindrical body. A railway vehicle characterized in that the outer cylinder and the mandrel have a length sufficient to overlap with each other, the other end being fitted with a mandrel so as to apply a preload displacement in a direction to enlarge the inner diameter of the cylindrical body. Axle box support device for truck. 2. The axle box support device for a railway vehicle bogie according to claim 1, wherein the elastic body is vulcanized and bonded to an outer cylinder and a core metal, and a metal coil spring and the elastic body are vulcanized and bonded.