JPH0532261Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a mold device for molding a flexible boot used as a dust cover for a constant velocity joint.

PRIOR TECHNOLOGY Generally, flexible boots used for constant velocity joints, etc. are bellows-shaped and are designed to undergo elastic expansion, contraction, bending, and other movements. When this changes, the pressure in the inner space, that is, the internal pressure of the flexible boot changes. The change in internal pressure also occurs when air flows into and out of the flexible boot through the rubber wall of the flexible boot due to a change in temperature difference between the inside and outside of the flexible boot. If such a change in internal pressure, particularly a phenomenon in which the internal pressure decreases significantly, occurs, problems such as the flexible boot denting and coming into contact with a movable member within the inner space occur. Therefore, in order to eliminate such inconveniences, a configuration is widely adopted in which a small hole is provided in the rubber wall of the flexible boot to communicate the inner space with the outside and to maintain the inner space at atmospheric pressure at all times. Further, Japanese Utility Model Publication No. 62-2380 discloses a configuration in which a filter is attached to the small hole in order to prevent dust and the like from entering the inner space together with the air through the small hole. That is, the configuration described in this publication is such that a filter member made of a mesh-like metal or the like is attached to a tubular main body having a through hole so as to cross the through hole, and the filter member is attached to a tubular main body having a through hole. It was installed on.

Conventionally, the above-mentioned flexible boots having small holes have been manufactured using an upper mold, a lower mold, and a core mold which is arranged between the upper mold and the lower mold and forms a mold cavity between these molds. The flexible boot was manufactured by molding the flexible boot using a mold device having a mold and then forming small holes through machining. Further, the filter member described in the above-mentioned publication is manufactured as a separate part from the flexible boot, and is designed to be attached to a small hole in the flexible boot.

Problems to be Solved by the Invention The configuration shown in the above-mentioned Japanese Utility Model Publication No. 62-2380 involves manufacturing the filter member as a separate part from the flexible boot, and reducing the size by machining after molding the flexible boot. There was a problem in that the manufacturing process required a large number of man-hours, in which the filter member was attached to the small hole after the hole was formed. Furthermore, since the filter member was attached to the small hole by fitting using elastic force, there was a problem that the filter member might come off from the flexible boot when the flexible boot was used.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a mold device that can easily mold a flexible boot in which a filter is integrally and firmly fixed.

Means for Solving the Problems The present invention provides the above-mentioned mold device with a protrusion protruding into the mold cavity on at least one of the upper mold and the lower mold, and on the core mold. The above problem is solved by providing a protrusion that protrudes into the mold cavity and holds the filter between the protrusion and the protrusion when the mold device is in the mold clamping state.

Effect: According to the mold device of the present invention, the filter is held between both projections so that the peripheral edge of the filter protrudes outward from the peripheral surfaces of the projections, and in this state, the mold cavity is covered with rubber. By injecting the material and performing molding, a flexible boot is molded in which a filter is provided so as to cross small holes that are complementary to both of the protrusions.

Embodiment FIGS. 1 and 2 show a mold apparatus for molding flexible boots according to an embodiment of the present invention. That is, this mold device is arranged between an upper mold 2 and a lower mold 3, and between the upper mold 2 and the lower mold 3.
Core mold 1 forming a mold cavity 4 between 3 and 3.
It has The mold 2 is formed with a protrusion 2a that protrudes into the mold cavity 4, and the core mold 1 has a protrusion 2a that protrudes into the mold cavity 4. A protrusion 1a is formed between which the filter 6 is held between the protrusion 2a and the protrusion 2a when the filter is in the tightened state.

The mold apparatus of the illustrated embodiment has the above-mentioned configuration, and when molding a flexible boot, first, when the upper mold 2 is in the open state above the position shown in FIG. The filter 6 is placed on the protrusion 1a, and then the upper mold 2 is lowered and the first
The mold is in the clamped state shown in the figure, and the filter 6 is fixed by sandwiching it between the protrusions 1a and 2a. In this state, by injecting rubber material into the mold cavity 4 through the injection hole 5 and performing molding, small holes complementary to the protrusions 1a and 2a are formed, and a filter crosses the small holes. 6 can be obtained.

As the filter 6, mesh-shaped metal, cloth, fiber, etc. can be used.
In addition, the filter 6 has an outer dimension of the protrusion 1
a and 2a, and when the filter 6 is held between the protrusions 1a and 2a, the peripheral edge of the filter 6 protrudes outward from the circumferential edge of the protrusions 1a and 2a, and the protruding portion is arranged in the mold apparatus such that it is located in the mold cavity 4.

In the illustrated embodiment, the upper mold 2 and the core mold 1 are provided with projections 2a and 1a, respectively, but instead of this construction, the lower mold 3
A similar protrusion may be provided on the core mold 1 and the core mold 1. In this case, the filter 6 is placed on the protrusion of the lower mold 3 while the mold device is in the open state and the core mold 1 is not placed on the lower mold 3,
After that, the core mold 1 is placed on the lower mold 3, a filter is held between the protrusion of the lower mold and the protrusion of the core mold, and the mold is clamped in this state to perform molding. become. In addition, by providing one protrusion on each of the upper mold and the lower mold, and providing a protrusion on the core mold that holds the filter between each of these protrusions, a filter can be attached to each of the upper and lower molds. It is also possible to mold a flexible boot with two small holes provided with.

Magnets 8 are attached to the tips of the protrusions 1a and 2a.
By fixing magnets 8a and 8b and using a filter 6 made of a metal material, magnets 8a and 8b can be
The filter 6 is attached to the protrusions 1a and 2a due to the suction force of b.
It is also possible to ensure that they are fixed in between. Also, attach the magnet to both protrusions 1a and 2a.
The magnet 8a is provided only on the lower protrusion, that is, the protrusion 1a of the core mold 1, and the filter 6 placed on the protrusion 1a is attached to the magnet 8a.
The filter 4 may be fixed by the adsorption force to prevent the filter 4 from moving during subsequent mold clamping work.

Effects of the invention As is clear from the above, the mold device of the invention has the following effects:
This has the effect of making it possible to extremely easily mold a flexible boot in which a filter is provided across the small hole.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a mold device for molding a flexible boot according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts thereof. 1... Core mold, 1a... Projection, 2... Upper mold, 2a... Projection, 3... Lower mold, 4... Mold cavity, 6... Filter.

Claims (1)

[Scope of utility model registration request] In a mold device for molding flexible boots, the mold device includes an upper mold, a lower mold, and a core mold disposed between the upper mold and the lower mold and forming a mold cavity between the molds. At least one of the upper mold and the lower mold is provided with a protrusion that protrudes into the mold cavity, and the core mold protrudes into the mold cavity so that the mold device is in a mold clamping state. A mold device for molding flexible boots, characterized in that a protrusion is provided to sandwich a filter between the protrusion and the protrusion.