JPS6044630A - Pneumatic spring - Google Patents

Abstract

PURPOSE:To improve the accuracy of positioning at the time of fixing work by inserting a rubber bellows of a pneumatic spring in a circular groove of a metal fitting to be fixed by caulking. CONSTITUTION:A circular groove 12 at least one side of which is a caulking wall 11 is formed on pneumatic spring metal fittings 10, 10'. The end portion of a rubber bellows 13 is inserted in the circular groove 12 and caulked, and a wall 11 is bent to the circular groove side 12 as shown by one-dotted line, so that the rubber bellows 13 is fixed to the metal fittings 10, 10'. Thus the end surface of the rubber bellows 13 is brought into contact with the base of the circular groove 12 and fixed there so as to improve the accuracy of positioning.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to air splashes, and in particular to a fixing structure for its rubber bellows.

(b) Prior Art FIG. 1 shows an example of a conventional air spring. Generally, an air spring is made by fixing each end of Nicom Heroes 2 between a pair of opposing air spring fittings 1 and 1', and fitting an appropriate valve device into an air hole 3 provided in one fitting 1. By sealing air inside, a buffering effect is achieved. The rubber bellows 2 used is one in which a reinforcing cord 4 is embedded, but in the air spring targeted by this invention, it does not have a reinforcing core (bead, etc.) for fixing, and the crimping ring 5 It is fixed to both metal fittings 1,1.

(c) Problems to be solved by the invention In the above air spring, the longitudinal positioning accuracy of the rubber bellows 2 is required to be quite strict, but the dimensions of the caulking ring 5, the bellows 2, and the metal fitting 1.1' There is a problem in that it is difficult to achieve sufficient accuracy due to variations in accuracy and positioning accuracy during fixing work.

If the reinforcing cord 4 is exposed from the end surface of the rubber bellows 2, there is a problem in that moisture in the atmosphere or the like can enter the rubber bellows 2 along the cord, causing fatigue failure.

Therefore, an object of the present invention is to provide an air spring that solves the above problems.

2) Means for Solving the Problems The basic structure of the present invention adopted to solve the above problems is as shown in FIG. The rubber bellows 13 is fixed to the metal fitting 10 by forming a certain annular groove 12, inserting the end of the rubber bellows 13 into the annular groove 12, and bending the caulking wall 11 toward the groove 12 as shown by the dashed line. The structure is as follows.

(e) Examples FIG. 3 shows an embodiment employing the above basic configuration.

This air spring has a rubber bellows 13 fixed between a pair of opposing air spring fittings io, io, as in the conventional case, and one fitting 10 has a recess 14 in the center of the opposing surface. One end of a rubber bellows 13 is fixed to the end surface of the peripheral wall 15. Furthermore, a screw hole 16 for fixing is provided on the opposite surface of the recess 14.

The other metal fitting 10 is provided with a convex portion 16 in the center of the opposing surface that fits into the concave portion 14 with sufficient margin, and the convex portion 1
A circumferential wall 17 is provided around 6 at a distance such that the circumferential wall 15 of the metal fitting 10 fits thereinto, an air hole 18 is provided in the circumferential wall 17, and the other end of the bellows 13 is fixed to the end surface of the circumferential wall 17. Furthermore, a fixing screw hole 19 is provided on the opposite surface of the convex portion 16.

The means for fixing the bellows 13 to these peripheral walls 15, 17 is similar to that described with reference to FIG.
The bellows 1
3 is fixed.

Although the bellows 13 has a structure in which the end face of the reinforcing cord 20 is not exposed from the end in the illustrated case, it may have a structure in which the end face of the reinforcing cord 20 is exposed. Even if the reinforcing cord 20 is exposed, the exposed end is sealed within the annular groove 12 and shielded from the atmosphere, so moisture will not infiltrate from the exposed end. On the contrary, if the reinforcing cord 20 is exposed, the end of the bellows 13 will be securely connected to the reinforcing cord 2.
This is desirable because it can be confirmed that 0 exists.

FIG. 4 shows another embodiment, in which one metal fitting 10 is provided with a flange 21 and a mounting hole 22 is provided in this. The fixing structure of the bellows 13 is the same as that described above.

In each of the above embodiments, the caulking wall 11 is provided on the outside of the annular groove 12, but the caulking wall 11 is formed on the inside of the annular groove 12, as shown in FIG. The bellows 13 may be fixed by bending in the direction.

Furthermore, as shown in FIG. 6, caulking walls 11.11 may be formed on both the inner and outer sides of the annular groove 12, and both may be bent and fixed.

Furthermore, in either case of FIG. 5 or FIG. 6, the structure may be such that the end surface of the reinforcing cord 13 is exposed from the end of the bellows 13, as described above.

(F) Effects As mentioned above, in this invention, the rubber bellows is inserted into the annular groove of the metal fitting and fixed by caulking.
During fixing work, positioning can be achieved by placing the end face of the rubber bellows against the bottom of the annular groove. Therefore, there is an effect that the fixed positioning accuracy is improved. Furthermore, since it is fixed by a caulking wall that is a part of the metal fitting, there is an advantage that a caulking ring is not required.

Furthermore, as shown in the embodiment, even if a rubber bellows with the end face of the reinforcing cord exposed from the end is used, the end of the rubber bellows is enclosed within the annular groove and is shielded from the outside air, so it will not absorb atmospheric moisture. can be prevented from entering the inside of the bellows along the cord.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted sectional view of a conventional example, Fig. 2 is a partially sectional view showing the basic structure of the present invention, Fig. 3 is a sectional view of an embodiment, and Fig. 4 is a sectional view of another embodiment. A partially omitted sectional view, and FIGS. 5 and 6 are partially sectional views of other modifications. 10.10...Metal fittings, 11...Caulking wall, 12...
- Annular groove, 13...Rubber bellows, 20...Reinforcement cord. Patent applicant: Sumitomo Electric Industries, Ltd. Agent: Kama 1) Bun 2

Claims (1)

[Claims] (11) In an air spring in which a rubber bellows is fixed between a pair of opposing metal fittings, an annular groove having at least one side as a caulking wall is formed in the metal fitting, and an end of the rubber bellows is inserted into the annular groove. An air spring characterized in that the rubber bellows is fixed to the metal fitting by bending the caulking wall toward the groove. (2) The caulking wall is provided outside the annular groove and is bent in the direction of diameter reduction. The air spring according to claim 1, characterized in that the rubber bellows is fixed to the metal fitting by: (3) providing the caulking wall inside the annular groove and bending it in the direction of diameter expansion; (4) The caulking walls are provided on both sides of the annular groove, and the outer caulking walls are oriented in the diametrical direction. The air spring according to claim 1, characterized in that the rubber bellows is fixed by bending the inner caulking wall in the direction of diameter expansion. The air spring according to any one of claims 1 to 4, wherein the air spring is exposed at an end portion inserted into the air spring.