CN111059189A

CN111059189A - Shaft spring

Info

Publication number: CN111059189A
Application number: CN201910145305.4A
Authority: CN
Inventors: 筱原克行
Original assignee: Neda Chemical Co Ltd
Current assignee: Neda Chemical Co Ltd
Priority date: 2018-10-16
Filing date: 2019-02-27
Publication date: 2020-04-24
Also published as: JP2020063761A

Abstract

The technical problem is as follows: the invention aims to provide a shaft spring which is light and can inhibit the reduction of the productivity. The solution is as follows: the shaft spring is provided with a shaft core (1), an outer cylinder (2), and an elastic part (3) clamped between the shaft core (1) and the outer cylinder (2), wherein the elastic part (3) is provided with a laminated rubber structure in which an elastic layer (4) and a partition (55) are alternately laminated in the radius direction, and the partition (5) is provided with: the main body part (6) and the flange part (7) which is formed on the upper edge part and the lower edge part of the main body part (6) and extends along the radius direction preferably have a structure of a plurality of reinforcing parts (13) formed on the middle part of the main body part (6) in the vertical direction X.

Description

Shaft spring

Technical Field

The invention relates to a shaft spring which is suitable for a vehicle, in particular for a railway vehicle.

Background

For example, in a railway vehicle, in order to alleviate a collision during a vertical movement, an axle spring interposed between a bogie frame and an axle-side member is used. As a specific structure of the shaft spring, as shown in patent document 1, there is known a laminated rubber structure in which elastic portions are interposed between a shaft core (shaft core) and an outer cylinder having the same axial center as the shaft core, the elastic portions being alternately laminated in the radial inner and outer directions in a state where a plurality of rubber layers and one or more partition walls (intermediate hard cylinders) are concentric with the shaft core. As a method for manufacturing the above-described shaft spring, as shown in fig. 3 and 4 of patent document 1, there is known a method in which the shaft core 1, the outer cylinder 2, and the hard partitioning wall 5 are provided in a mold, and after the mold is closed, unvulcanized rubber is injected into the mold, thereby vulcanizing and molding the rubber layer 4.

Documents of the prior art

Patent document

Patent document 1: japanese patent publication 2011-127627

Disclosure of Invention

Technical problem to be solved

In recent years, weight reduction has been demanded as a shaft spring. However, the change in the thickness of the rubber layer constituting the elastic portion of the shaft spring affects the rubber properties and durability. Therefore, it is difficult to reduce the thickness of the rubber layer while maintaining the characteristics of the shaft spring. On the other hand, if the thickness of the partition wall constituting the elastic portion of the shaft spring is reduced, the strength of the partition wall is reduced, which causes the following problems.

That is, since the partition wall and the rubber layer are vulcanization-bonded, the surface of the partition wall is subjected to an injection treatment in order to improve the adhesiveness. In the ejection process, the pellets are ejected onto the partition walls while rotating the partition walls by an endless belt, a rotating drum, or the like. In this case, the strength of the partition walls is reduced by merely reducing the thickness of the partition walls, and the partition walls may be deformed by contact with each other. In addition, there is also a problem that the partition wall is locally deformed by an external force when the product is used.

Therefore, an object of the present invention is to provide a shaft spring that is reduced in weight, suppresses local deformation of the shaft spring during use, and can suppress a decrease in productivity.

(II) technical scheme

In order to achieve the above object, a shaft spring according to an aspect of the present invention includes: the elastic portion has a laminated rubber structure in which an elastic layer and a partition wall are alternately laminated in a radial direction, and the partition wall includes: the flange portion is formed at an upper edge portion and a lower edge portion of the main body portion and extends in a radial direction.

The partition wall may include: and a plurality of reinforcing portions formed at vertically intermediate portions of the main body portion, the reinforcing portions being raised strip portions or recessed groove portions formed on an outer surface of the main body portion in a vertical direction of the main body portion.

In addition, an upper end portion of the reinforcing portion may be formed so as to converge on the outer surface of the main body portion up to an upper edge portion of the main body portion, and a lower end portion of the reinforcing portion may be formed so as to converge on the outer surface of the main body portion up to a lower edge portion of the main body portion.

(III) advantageous effects

According to the shaft spring of one aspect of the present invention, since the flange portions are provided at the upper and lower edge portions of the partition wall, the rigidity can be increased as compared with a simple cylindrical partition wall, and local deformation when used as a product can be suppressed, so that the strength and durability can be improved. Further, since the areas of the upper edge portion and the lower edge portion of the partition wall are increased by the flange portion of the partition wall, it is possible to suppress the risk of damage to or deformation of another partition wall due to contact between the upper edge portion or the lower edge portion of the partition wall and another partition wall when the blast treatment is performed. This can suppress a drop in productivity.

Drawings

Fig. 1 is a bottom view showing a first embodiment of a shaft spring according to the present invention.

Fig. 2 is a sectional view taken along line a-a of the shaft spring of fig. 1.

Fig. 3 is a bottom view showing a shaft spring according to a second embodiment of the present invention.

Fig. 4 is a sectional view taken along line B-B of the shaft spring of fig. 3.

Detailed Description

(first embodiment)

A first embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a bottom view showing an embodiment of a railway vehicle axle spring as an axle spring according to the present invention. Fig. 2 is a sectional view taken along line a-a of fig. 1. The axle spring for railway vehicles is interposed between both sides of an axle box supporting an axle and a bogie frame.

As shown in fig. 1 and 2, the shaft spring of the present embodiment includes: the elastic member 3 has a laminated rubber structure in which elastic layers 4 and partition walls 5 are alternately laminated in a radial direction. The shaft core 1, the rubber layer 4, the partition 5, and the outer cylinder 2 all have the same shaft center P. In the figure, arrow X indicates the vertical direction.

The partition wall 5 is formed of a metal cylindrical body, and includes: a main body portion 6 having a conical tube shape which gradually decreases in diameter from one side to the other side in the axial direction P, and a flange portion 7 formed at an upper edge portion and a lower edge portion of the main body portion 6 and extending in the radial direction. As the partition wall 5, four having different diameters are used. In the present embodiment, the flange portion 7 is formed as an inner flange portion 7a extending radially inward at the upper edge portion of the partition wall 5, and an outer flange portion 7b extending radially outward at the lower edge portion of the partition wall 5, but the present invention is not limited thereto, and the flange portions may be oriented in opposite directions or in the same direction at the upper edge portion and the lower edge portion of the partition wall 5.

The surface of the partition wall 5 is roughened by the blasting treatment. In the ejection process, as described above, the pellets are ejected while rotating the plurality of partition walls 5 by the endless belt, the rotary drum, or the like. In the present embodiment, since the flange portions 7 are provided at the upper edge portion and the lower edge portion of the partition wall 5, the flange portions 7 function as reinforcing ribs, and the strength of the partition wall 5, particularly the strength of the upper edge portion and the lower edge portion of the partition wall 5, can be increased. Further, by increasing the areas of the upper edge portion and the lower edge portion of the partition wall 5 with the flange portion, it is possible to suppress the risk of the other partition wall 5 being damaged or deformed by the upper edge portion or the lower edge portion of the partition wall 5 coming into contact with the other partition wall 5. This can reduce the weight of the partition wall 5 and suppress a decrease in the productivity of the shaft spring.

The spindle 1 is fitted to the axle box together with a pin 8 having a lower end projection projecting downward. A disc-shaped mounting plate 9 is fitted into an upper opening of the outer cylinder 2. A cylindrical portion 10 is connected to the center of the mounting plate 9, and when the shaft spring is in use, the upper end of the shaft core 1 enters the cylindrical portion 10, and when the horizontal relative displacement between the outer cylinder 2 and the shaft core 1 reaches a certain range, the upper end of the shaft core 1 contacts the inner wall of the cylindrical portion 10, and restricts further relative displacement.

That is, the mounting plate 9 functions as a restricting member that restricts the horizontal relative displacement of the shaft spring together with the shaft core 1. A plurality of fixing portions 12 having through holes 11 are provided on the outer peripheral surface of the outer tube 2, and in a state where the mounting plate 9 is fitted into the outer tube 2, the fixing portions are screwed to the bogie frame by screws such as bolts (not shown) inserted through the through holes 11.

(second embodiment)

Fig. 3 is a bottom view of a shaft spring according to a second embodiment of the present invention, and fig. 4 is a sectional view taken along line B-B of fig. 3. In the present embodiment, a reinforcement portion is formed in the partition wall 5, and the other configuration is the same as that of the first embodiment.

As shown in the drawing, in the present embodiment, a plurality of reinforcing portions 13 are formed in the intermediate portions in the vertical direction X of the main body portion 6 of the partition wall 5. The reinforcing portions 13 are formed in plurality at equal intervals in the circumferential direction of the main body portion 5 as raised portions extending in the vertical direction on the outer surface of the main body portion 6 of the partition wall 5. The inner surface of the main body 6 of the reinforcing portion 13 is formed into a groove portion. That is, the reinforcing portion 13 is formed so that a part of the main body portion 6 bulges outward.

According to the above configuration, the strength of the partition wall 5 can be improved by the reinforcement portion 13 functioning as a rib. The reinforcing portion 13 can further suppress deformation of the partition wall 5 at the time of the injection treatment, and can particularly improve the strength of the intermediate portion of the partition wall 5, and therefore can effectively suppress deformation of the partition wall 5 due to unvulcanized rubber pressure unevenly applied to the partition wall 5, which is generated when unvulcanized rubber is press-fitted into a mold in which the partition wall 5 is provided.

The reinforcing portion 13 may be formed as a ridge portion on the outer surface of the main body portion 6, or may be formed as a groove portion. In addition, a part of the plurality of reinforcing portions 13 may be a ridge portion and the rest may be a groove portion. The reinforcing portion 13 is formed at an intermediate portion in the vertical direction X of the main body portion 6. The upper end of the reinforcing portion 13 is formed so as to converge on the outer surface of the main body 6 up to the upper edge of the main body 6, and the lower end of the reinforcing portion 13 is formed so as to converge on the outer surface of the main body 6 up to the lower edge of the main body 6.

According to the above configuration, since the flange portion 7 and the reinforcing portion 13 are disposed at positions not in contact with each other, that is, the flange portion 7 and the reinforcing portion 13 are disposed separately from each other, a sufficient space can be secured therebetween, and occurrence of unfilled unvulcanized rubber can be suppressed.

The reinforcing portion 13 is preferably formed in a shape continuous with the main body portion 6 in the vertical direction X and the circumferential direction of the partition wall 5. That is, the occurrence of unfilled unvulcanized rubber can be further suppressed by arranging the steps or other discontinuous shapes. In the present embodiment, the reinforcement portion 13 is formed so as to have a gentle curve in both the vertical direction X and the circumferential direction cross section of the partition wall 5.

The embodiments of the present invention have been described above, but the scope of the present invention is not limited to these, and various modifications can be made without departing from the scope of the present invention. For example, in the present embodiment, the partition walls are cylindrical, but the present invention is not limited to this, and may be a shape divided into a plurality of parts in the circumferential direction of the partition walls 5.

The constituent elements disclosed in the present embodiment and the modifications described above can be combined with each other, and new technical features can be formed by combining them.

Description of the reference numerals

1-an axial core;

2-outer cylinder;

3-an elastic part;

4-an elastic layer;

5-a partition wall;

6-a main body portion;

7-a flange portion;

8-pin;

9-mounting a plate;

10-a cylindrical portion;

11-a through hole;

12-a fixed part;

13-a reinforcement;

p-axis.

Claims

1. A shaft spring is characterized by comprising: a shaft core, an outer cylinder, and an elastic part interposed between the shaft core and the outer cylinder, the elastic part having a laminated rubber structure in which an elastic layer and a partition wall are alternately laminated in a radial direction,

the partition wall includes: the flange portion is formed at an upper edge portion and a lower edge portion of the main body portion and extends in a radial direction.

2. Shaft spring according to claim 1,

the partition wall includes: and a plurality of reinforcing portions formed at vertically intermediate portions of the main body portion, the reinforcing portions being raised strip portions or recessed groove portions formed on an outer surface of the main body portion in a vertical direction of the main body portion.

3. Shaft spring according to claim 1 or 2,

the upper end portion of the reinforcing portion is formed so as to converge on the outer surface of the main body portion up to the upper edge portion of the main body portion, and the lower end portion of the reinforcing portion is formed so as to converge on the outer surface of the main body portion up to the lower edge portion of the main body portion.