JP2002364613A - Ring caulking structure of cylindrical rubber part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems in a ring caulking structure wherein right hexagonal caulking can be performed one time by an upper and lower type press and is suitable for mass production, but its deviation load is small and it is limited to a part having a small load, flat hexagonal caulking can obtain comparatively high deviation load, but a entirely satisfactory value cannot be obtained, circular caulking can obtain high deviation strength, but it must be performed by dividing caulking work into several processes if the upper and lower type press is used and it is not suitable for mass production, and, swaging system caulking is complicated is processing and it is not suitable for mass production as same as above. SOLUTION: A cylindrical rubber part 3 having a core material 2 is compressed and fitted into a metallic ring 3 having a modified triangle shape in which each corner part of an equilateral triangle forms sides close to the center of the equilateral triangle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a cylindrical rubber part containing a core material is caulked with a metal ring.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a rubber rubber boot 3 is fitted and fixed to a flexible outer tube 2 into which an inner cable 1 is slidably inserted. To fix the parts to the core, use a metal ring 4
Is crimped, and is generally crimped into a regular hexagon or a circle.

[0003]

A regular hexagonal caulking can be performed by one vertical press and is suitable for mass production, but is limited to a light load with a small displacement load. A flat hexagonal caulking can provide a relatively high load, but does not provide a sufficiently satisfactory value. Circular caulking can provide high strength, but upper and lower presses need to be performed in several steps,
Not suitable for mass production. There is another swaging method, but the process is complicated and is not suitable for mass production.

[0004] It is an object of the present invention to provide a caulking structure capable of obtaining a high load equivalent to a circular caulking in one vertical press.

Here, the shift load means a minimum load at which a core material such as an outer tube shifts with respect to a cylindrical rubber part such as a boot.

[0006]

According to a first aspect of the present invention, there is provided a method of forming an irregular triangle metal in which each corner of an equilateral triangle forms a side close to the center of the equilateral triangle. A cylindrical rubber part containing a core material is compressed and fitted into the ring made of a metal.

According to a second aspect of the present invention, in the first aspect of the present invention, the first die having the first trapezoidal groove is formed, the opening width substantially matches the first trapezoidal groove, and the depth is equal to the first trapezoidal groove. Around a cylindrical rubber part containing a core material, between the second die having a second trapezoidal groove deeper than the first trapezoidal groove and having a groove bottom width narrower than the first trapezoidal groove. , A cylindrical body fitted with a metal ring was inserted thereinto, and pressed by the first and second molds.

According to a third aspect of the present invention, in the first or second aspect, the core material is an outer tube of the control cable.

[0009]

According to the first aspect of the present invention, since the cylindrical rubber part is compressed and fitted into the irregular triangular metal ring, the sectional area of the cylindrical rubber part in the metal ring is reduced. The metal ring is strongly caulked and the displacement load is large.

According to the second aspect of the present invention, it is possible to perform caulking without generating burrs by a single pressing force of the first die and the second die.

The invention according to claim 3 is suitable for caulking cylindrical rubber parts such as rubber boots since the core material is an outer tube.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a cross-sectional shape before caulking. A cylindrical rubber part 3 which is an end of a soft rubber boot is provided around the outer periphery of a synthetic resin outer tube which is a core material 2 having a hollow inner cable 1 inserted therein. A ring 4 made of aluminum is fitted around the outer periphery thereof, and its dimensions are as shown in the figure.

FIG. 2 shows a state immediately before caulking the structure. The first die 6 in which the first trapezoidal groove 7 is formed is an upper die, and the opening width is substantially equal to that of the first trapezoidal groove 7. The depth is first
Of the first trapezoidal groove 7 that is deeper than the trapezoidal groove 7
When the structure is pressed with the second die 8 having the narrower second trapezoidal groove 9 formed therein as the lower die, the structure is crimped into an irregular triangle whose corners are crushed as shown in FIG.

FIG. 5 shows a cylinder obtained by caulking the above-mentioned structure into a regular hexagon A, a flat hexagon B, an irregular triangle C of the present embodiment, a circle D having an outer diameter of 6 mm, and a circle E having an outer diameter of 5.5 mm. The cross-sectional area after crimping of the rubber-shaped rubber part 3 is shown, and () is a graph showing the ratio of the cross-sectional area after crimping to the cross-sectional area before crimping.

According to this graph, it is clear that the irregular triangle C of the present embodiment is caulked more strongly than the regular hexagon A and the flat hexagon B, and is caulked similarly to the case of the circle D having an outer diameter of 6 mm. is there.

FIG. 6 shows, similarly to FIG. 5, the above-mentioned structure as a regular hexagon A, a flat hexagon B, an irregular triangle C of the present embodiment, a circle D having an outer diameter of 6 mm, and a circle E having an outer diameter of 5.5 mm. It is a graph which shows the shift | offset | difference load from the cylindrical rubber part 2 of the core material 1 at the time of each caulking.

According to this graph, the irregular triangle C caulking of this embodiment has a significantly higher displacement load than the regular hexagon A and the flat hexagon B caulking, and the circle D which needs to be subjected to multiple press caulking or swaging. It is clear that a large displacement load close to the caulking of E can be secured.

As described above, when caulking into an irregular triangle, a single load is applied, so that a displacement load substantially equivalent to the circular caulking method in which the pressure is applied a plurality of times can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view before pressing.

FIG. 2 is a cross-sectional view of a state in which the sheet is put in a press die.

FIG. 3 is a sectional view immediately after pressing.

FIG. 4 is a cross-sectional view showing a state in which a boot, which is a cylindrical rubber part, is caulked with a ring on an outer tube, which is a core material.

FIG. 5 is a graph showing a cross-sectional area of a cylindrical rubber component when caulked into various shapes, and a graph in parentheses shows a ratio of a cross-sectional area after caulking to a cross-sectional area before caulking.

FIG. 6 is a graph showing a shift load of a core material from a cylindrical rubber part when caulking into various shapes.

[Explanation of symbols]

 2: Core material 3: Cylindrical rubber part 4: Ring (made of aluminum) 6: First mold 7: First trapezoidal groove 8: Second mold 9: Second trapezoidal groove

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Claims (3)

[Claims] 1. A cylindrical shape in which a cylindrical rubber part containing a core material is compressed and fitted into an irregular triangular metal ring in which each corner of the equilateral triangle is close to the center of the equilateral triangle. Ring caulking structure for rubber parts. 2. A first mold having a first trapezoidal groove formed therein,
A second trapezoidal groove having an opening width substantially coincident with the first trapezoidal groove, a depth being deeper than the first trapezoidal groove, and a groove bottom having a width smaller than that of the first trapezoidal groove was formed. 2. The method according to claim 1, wherein a cylindrical body containing a core material in which a metal ring is fitted around a cylindrical rubber component is inserted between the second mold and the first mold and the first and second molds are pressed. A ring caulking structure for the cylindrical rubber part described. 3. The caulking structure of a cylindrical rubber part according to claim 1, wherein the core material is an outer tube of a control cable.