JPH085403Y2 - Coil spring insulator - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a coil spring insulator having improved releasability from a core after molding.

[Prior Art] In a conventional coil spring insulator, as shown in FIG. 5, an annular plate-shaped flange portion 52 is formed at one end and extends to the other end to form a hollow bellows-shaped dust cover. The portion 53 is formed, and the flange portion 52 and the dust cover portion 53 are connected to each other to form a thick portion 54, which is integrally molded from a rubber elastic body.

By the way, conventionally, mold release of a hollow rubber molded product such as a coil spring insulator having a thick wall portion and a bellows-shaped dust cover portion and a molding core is performed by holding one open end of the rubber molded product, A mold release process is performed in which pressurized air is sent between the molded product and the molding core to expand the rubber molded product in the circumferential direction while pulling it out of the molding core. For example, a mold releasing device for bringing a suction cylinder having a suction hole into contact with the outer periphery of a rubber molded product and vacuum suction from the suction hole to hold one open end of the rubber molded product (Japanese Patent Laid-Open No. 55-159959). Or a mold releasing apparatus and a mold releasing method (see Japanese Utility Model Publication No. 61-6095), which are composed of an inner cylinder and an outer cylinder inward annular projections that move in the axial direction relatively.

[Problems to be solved by the device]

However, in the above-described conventional coil spring insulator, the compressed air does not uniformly expand over the entire length, and the convex portion of the bellows-like dust cover portion 53 easily expands locally at one location. Further, the flange portion 52 and the thick portion 54 are formed thick, and only the groove 55 is provided on the outer surface of the flange portion 52. Therefore, in the conventional coil spring insulator, the thick portion 4 is very difficult to expand, the molding core is not smoothly separated and separated, a strong force is required, or the core must be extracted by force. In the automatic mold release, there are problems in that the workability of the mold release operation is particularly poor and the coil spring insulator is damaged.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a coil spring insulator that can easily release the coil spring insulator even in automatic release, and that has good workability in release operation. The purpose is to

[Means for solving the problem]

The gist of the present invention is to provide an annular plate-shaped flange portion formed at one end portion, a hollow bellows-shaped dust cover portion formed to extend to the other end portion, the flange portion and the dust cover portion. In a coil spring insulator integrally formed with a thick wall portion connecting from a rubber elastic body, a plurality of recessed grooves that open inward and extend in parallel to the axial direction from the flange portion to the thick wall portion are formed on the flange portion. And the wall thickness between the outer peripheral surface of the thick portion and the outer peripheral surface is 5 mm or less.

[Action / effect]

According to the present invention, an annular plate-shaped flange portion formed at one end portion, a hollow bellows-shaped dust cover portion extending to the other end portion, and the flange portion and the dust cover portion are connected to each other. In a coil spring insulator integrally formed with a thick portion of a rubber elastic body, a concave groove that opens inward from the flange portion formed from the rubber elastic body to the thick portion extends in parallel to the axial direction. To drill. This groove is designed so that the wall thickness between the flange portion and the outer peripheral surface of the thick wall portion is 5 mm or less, so that the thick wall portion of the coil spring insulator easily expands and deforms, and local Since the expansion is eliminated and the core is easily separated from the core, the mold releasability is improved and the coil spring insulator can be prevented from being damaged.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In the figure, 1 is a coil spring insulator. This coil spring insulator 1 has an annular plate-shaped flange portion 2 formed at one end and a hollow bellows-shaped dust cover portion 3 extending to the other end in the axial direction. The dust cover portion 3 is connected to the thick portion 4 and is integrally formed from a rubber elastic body.
Three recessed grooves 6 that open inward and extend in the axial direction from the flange portion 2 to the thick wall portion 4 have a wall thickness of 5 mm or less between the flange portion 2 and the thick wall portion 4 and the outer peripheral surface thereof. Has been drilled.

As shown in FIG. 2, the flange portion 2 has a plurality of radially extending grooves 5 formed on the outer surface thereof at predetermined intervals in the circumferential direction.

Further, the thick portion 4 extends in the axial direction from the surface of the flange portion 2 where the plurality of grooves 5 are not formed, and is connected to the thick portion 4 so that the other side of the flange portion 2 in the axial direction. The dust cover portion 3 extends to the outside, and these are integrally formed. In this example, the thick portion 4 is formed with an inclination.

When assembled to a metal fitting on the vehicle body side (not shown), a groove of a predetermined size is formed between the groove 5 and the metal fitting on the vehicle body side. The spring characteristics and the like can be tuned by appropriately setting the size, the arrangement interval, and the like. Further, the dust cover portion 3 integrally formed so as to extend in the axial direction in the direction opposite to the side where the flange portion 2 is formed is connected to the thick portion 4, and the dust cover portion 3 is exposed. It covers the rod part. The dust cover portion 3 is formed in a hollow bellows shape and is capable of expanding and contracting as the shock absorber expands and contracts.

Further, the coil spring insulator 1 is provided with a plurality of recessed grooves 6 opening inward from the flange portion 2 to the thick portion 4 in parallel to the axial direction. Moreover, the first
As shown in the figure, the thickness t of the outer peripheral wall 2a, 4a of the flange portion 2 and the thick wall portion 4 of the coil spring insulator 1 on the bottom side of the groove 6 is set to 5 mm or less.
The number of the grooves 6 and the wall thickness with the outer peripheral surface of the bottom are appropriately set according to the required spring characteristics and dimensions of the coil spring insulator 1, but if the wall thickness exceeds 5 mm, the number of the grooves 6 is increased. 5m because I have to do
less than m.

The coil spring insulator 1 having such a structure is molded by a vulcanizing press (not shown) and taken out together with the molding core 12 as shown in FIG. Is held concentrically with the rear end being fixed. Next, the inner cylinder 13 is advanced along the outer periphery of the molding core 12 from the base portion (right side of the drawing) by a driving device (not shown), and the molding core 12 and the coil spring insulator 1 are placed in the outer cylinder 14. Then, one end of the molding core 12 is inserted into the inner cylinder 13. After the opening end of the dust cover part 3 is scooped up from the molding core 12 by the inner cylinder 13, the movement of the inner cylinder 13 is stopped, and the coil spring insulator 1 is clamped by the clamp claw 15 by a driving device such as a driving cylinder.
The scooped-up portion of is pressed against the inner cylinder 13 to be gripped.

Then, pressurized air is sent from the base to the air supply port 16 to expand the coil spring insulator 1 in the circumferential direction.

Then, since the crank claws 15 are gripped on the opening end side of the dust cover portion 3 of the coil spring insulator 1, expansion of this end portion side is suppressed, while the thick portion 4 connected to the dust cover portion 3 and Due to the concave groove 6 that opens inside the thick portion on the flange portion 2 side, the portions 2a and 4a whose wall thickness with the outer peripheral surface is thin are expanded and deformed, and the coil spring insulator 1 is easily moved. Further, even if local expansion occurs due to a convex portion of the bellows, the external cylinder 14 surrounding the outer circumference of the coil spring insulator 1 at a predetermined interval suppresses excessive local expansion, so the coil spring insulator 1 Expand uniformly in the circumferential and longitudinal directions. In this state, the inner cylinder 13 is retracted toward the base to separate the coil spring insulator 1 from the molding core 12.

As described above, since the coil spring insulator of the present embodiment has a good mold release from the molding core, it is possible to solve the problems of equipment trouble and product damage which are obstacles to the automation of the mold release work.

[Brief description of drawings]

1 is a sectional view showing an embodiment of a coil spring insulator according to the present invention, FIG. 2 is a side view of the coil spring insulator shown in FIG. 1, and FIG. 3 is a side view of FIG.
4 is a sectional view taken along the line IV-IV, FIG. 4 is a sectional view for explaining a releasing operation of the coil spring insulator, and FIG. 5 is a sectional view of a conventional example of the coil spring insulator. 1 ... Coil spring insulator 2 ... Flange part 3 ... Dust cover part 4 ... Thick part 6 ... Recessed groove

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area B29K 105: 24

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped plate-shaped flange portion formed at one end, a hollow bellows-shaped dust cover portion extending to the other end, the flange portion and the dust cover portion. In a coil spring insulator integrally formed with a thick portion to be connected from a rubber elastic body, a plurality of recessed grooves that open inward and extend in parallel to the axial direction from the flange portion to the thick portion are formed on the flange portion. A coil spring insulator, characterized in that the wall thickness between the thick wall portion and the outer peripheral surface is 5 mm or less.