JPH0348426Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the bead structure of an air spring.
In particular, the structure of the bead part of the rubber membrane in a high-pressure, large-capacity diaphragm air spring has been improved.

[Conventional technology]

Conventionally, a diaphragm-shaped air spring has a diaphragm-shaped flexible rubber membrane 30 on a top plate 11 of an outer cylinder 10 and a top plate 21 of an inner cylinder 20, as shown in FIG.
The bead portions 31 and 32 on the inner and outer peripheral sides of the metal fitting 11
a, 21a to form an air chamber 24, and the auxiliary air tank 17 is communicated with the air chamber 24 through the air hole 23 in the top plate 21 of the inner cylinder 20.

This air spring is generally used at an internal pressure of 2 to 6 kgf/cm ² , and the rubber membrane 30 has two to four cord layers as shown in FIG. 6 (the figure shows a case of two layers). ) 33, 34, and the bead portions 31, 32 of the rubber membrane 30 are reinforced by the cord layers 3
The ends of the cord layers 33 and 34 are folded back around the bead 35 and bonded together, and the tension and balance of the rubber film 30 due to internal pressure are balanced by the interlayer adhesive force of the folded parts 33a and 34a of each cord layer 33 and 34. I'm learning to keep it.

[Problem that the invention attempts to solve]

In the above-mentioned air spring, if the pressure and capacity are higher than the normal one, the tension of the rubber membrane 30 will increase according to the internal pressure. Each code layer 3
A measure has been taken to increase the interlayer adhesion force by increasing the bonding length of the folded portions 33a, 34a of No. 3, 34.

However, increasing the bonding length of the folded portions 33a, 34a of each cord layer 33, 34 not only hinders the smooth operation of the rubber membrane 30 and adversely affects the performance of the air spring, but also reduces the cord material. There is a problem that costs increase and the product becomes expensive.

The object of this invention is to solve the above-mentioned problems and provide a bead structure of an air spring in which the required interlayer adhesion force can be obtained even if the length of the folded portion of the cord layer is shortened.

[Means for solving problems]

In the bead structure of the air spring according to this invention, the cord layer for reinforcing the rubber membrane is divided into at least two groups, and the terminal of the cord layer of each group is
Each group is wrapped around the same number of beads as the number of groups.

[Effect]

In this invention, the number of folded parts of the cord layer at the bead part of the rubber membrane can be made as many as the number of divided groups, so the adhesive length required for the folded part is as follows when the end of the cord layer is folded around one bead. can be made shorter than .

〔Example〕

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional side view showing an embodiment in which this invention is applied to the air spring shown in FIG. 5, which is explained as a conventional example.

In this embodiment, the structure other than the bead portion of the rubber membrane is the same as that in FIG. 5, so the main parts are denoted by the same reference numerals and detailed explanation will be omitted.

FIG. 2 is an enlarged sectional view showing the structure of the bead portion 31 on the inner cylinder side of the right side portion of the rubber membrane 30. As shown in FIG. The bead portion 32 on the outer cylinder side has a symmetrical structure.

The rubber membrane 30 is reinforced by eight cord layers, and these cord layers are divided into two groups of four layers each.
3 and the code layer 34 of the second group.

In the bead portion 31 of the rubber membrane 30, two beads 35 and 36, the same number as the number of divided groups, are arranged concentrically in two upper and lower stages, and the terminal of the cord layer 33 of the first group is connected to the lower stage. Fold around the bead 35 and overlap the folded part 33a, and
The cord layer 34 of the group is overlapped with the surface of the folded part 33a of the cord layer 33 of the first group, and its terminal is folded around the upper bead 36.
The folded portions 34a are overlapped.

When the bead portion 31 of the rubber film 30 has the above structure, the first group of cord layers 33 and the second group of cord layers 34 and their folded portions 3
3a and 34a, and the first
The folded part 33a of the code layer 33 of the group and the second
The cord layer 34 of the group is bonded to the cord layer 34 of the group.

Therefore, the code layers 33, 34 of each group
The adhesive length obtained by the folded parts 33a and 34a is 1/3 of the adhesive length obtained by folded parts 33a and 34a when the beads are folded all at once around one bead without dividing into each group. This means that they have the same adhesive strength.

FIG. 3 is a longitudinal sectional side view showing another embodiment of this invention.

In this embodiment, the bead portion 31 of the rubber membrane 30,
32 are arranged vertically and fixed to the side plate 12 of the outer cylinder 10 and the side plate 22 of the inner cylinder 20, respectively.

FIG. 4 is an enlarged sectional view showing the structure of the bead portion 32 on the outer cylinder side of the right side portion of the rubber membrane 30. The bead portion 31 on the inner cylinder side has a symmetrical structure.

Similarly to FIG. 2, the eight cord layers are divided into two sets of cord layers 33 and 34, a first group and a second group, and two beads 35 and 36 are attached to the bead portion 32 using a rubber film. They are arranged concentrically on the inner and outer circumferential sides of 30. 1st group code layer 3
The terminals of No. 3 are folded back around the inner bead 35 and the folded portions 33a are overlapped, and the second group of cord layers 34 overlaps the first group of cord layers 33.
The ends are folded back around the bead 36 on the outer peripheral side, and the folded parts 34a are overlapped.

The bead portion 32 of the rubber membrane 30 on the outer cylinder side is
The outer circumferential side of the metal fitting 13 is attached to the side plate 12 of the outer cylinder 10.
It is removably fixed by bolts 14 and 14, and its inner peripheral side is brought into contact with a receiving fitting 15 that is integrally formed with the side body 12 of the outer cylinder 10. Also, the rubber membrane 30
The bead portion 31 on the inner cylinder side has its outer peripheral side connected to the inner cylinder 20.
The inner circumferential side is removably fixed to the side plate 22 of the inner cylinder 20 by a receiving metal fitting 25 and a bolt 26.

In the embodiment described above, the folded portion 3 of the code layers 33 and 34 of each group is similar to the embodiment shown in FIG.
Even if the bonding length of 3a and 34a is shorter than the length of the folded portion when folded all at once without dividing into each group, the same adhesive strength can be obtained, and the following effects can also be obtained.

When tension is applied to the rubber membrane 30 due to the internal pressure acting on the air spring, the bead portions 31 and 32 receive a force pulling downward diagonally, but this pulling force is applied as a vertical component force and a horizontal component force. The receiving metal fittings 13, 23 and the receiving metal fitting 15, respectively.
25, the force acting on the bead portions 31 and 32 is dispersed and the safety factor is improved compared to the bead portion of the structure shown in FIG. 1, which receives the tension of the rubber membrane 30 only in the horizontal direction. .

Note that the bead portion of the rubber film in this example does not necessarily have to be arranged in the vertical direction as shown in the figure, but may be arranged in an oblique direction with respect to the vertical direction, and even in this case, the above-mentioned The same effects can be obtained.

In each of the above embodiments, the case where the cord layers for reinforcing the rubber membrane were divided into two groups was explained. However, depending on the capacity of the air spring, the internal pressure used, etc., a larger number of cord layers may be used to form the rubber membrane. If reinforcement is necessary, divide it into three or more groups, and create a structure in which the terminals of the cord layers of each group are individually folded around beads arranged in the same number as the number of groups, as in the previous embodiment. You can also.

[Effect of idea]

As explained above, in the bead portion of the air spring of this invention, the cord layer for reinforcing the rubber membrane is divided into at least two groups, and the terminals of the cord layers of each group are placed around each bead. Even if the adhesive length at the folded part of each group's cord layer is shorter than the adhesive length when the cord layers are folded all at once without dividing them into groups, the required layer The bead portion can have adhesive strength between the beads. Therefore, this invention provides a bead structure that balances the tension of the rubber membrane without increasing the adhesive length of the folded part of the cord layer when the internal pressure used in the air spring is high and large capacity. Therefore, the rubber membrane can be used as a high-performance air spring without interfering with its normal operation.

In addition, the bead portion having the structure of this invention is arranged vertically or diagonally, and the outer cylinder is connected to the outer cylinder by a receiving metal fitting that supports the vertical component of the force that the bead portion receives and a receiving metal fitting that supports the horizontal component of the force that the bead portion receives. When fixed to the inner cylinder, in addition to the above effects, the force applied to the bead part can be supported as component forces in two directions, and an air spring with a bead part structure having support strength with a high safety factor can be obtained. It will be done.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing an example of an air spring having a bead structure of this invention, and FIG.
FIG. 3 is a longitudinal sectional view showing another example of the air spring having the bead structure of this invention, and FIG.
FIG. 3 is an enlarged sectional view showing the bead portion of the air spring, FIG. 5 is a vertical sectional side view showing an example of an air spring having a conventional bead structure, and FIG.
It is an enlarged sectional view showing a bead part in the air spring of the figure. In the figure, 10 is an outer cylinder, 20 is an inner cylinder, 24 is an air chamber, 30 is a rubber membrane, 31 and 32 are bead parts, 3
3 and 34 are code layers, and 35 and 36 are beads.

Claims (1)

[Claims for Utility Model Registration] (1) An air chamber is formed between the outer cylinder and the inner cylinder by fixing bead portions on the inner and outer sides of a rubber membrane having multiple cord layers. The number of layers of the cord layer is divided into at least two groups, and the terminals of the cord layer of each group are folded around beads arranged in the same number as the number of groups for each group. Air spring bead structure. (2) The bead part of the rubber film made by folding the end of the cord layer of each group around the bead is arranged vertically or diagonally, and is used as a receiving metal fitting to support the vertical component of the force received by the bead part. The bead structure of an air spring according to claim 1, which is fixed to an outer cylinder and an inner cylinder by a receiving metal fitting that supports a horizontal component force.