JPS61164061A - Inlet pipe of engine - Google Patents

Abstract

PURPOSE:To reduce man-hour and cost by providing a gap between a spacer and a synthetic resin core and filling a portion of rubber forming a pipe body in the gap to provided a combined medium of the spacer and core. CONSTITUTION:A pipe body 1 is formed of rubber and a core 3 formed of phenole resin is interposed in a flange portion 2 extending from a portion of said body, while a pipe-like metal spacer 5 is interposed in the inner peripheral of a bolt inserting hole 4 disposed in the flange portion 2. In this case, a gap 7 is set between the spacer 5 and a rough hole 6 for the core 3 and filled with a portion of rubber for forming the pipe body 1 to provided a combined medium of spacer and core 5, 3. That is, the core 3 and spacer 5 are disposed in metal molds 8, 9 to be molded integrally with the pipe body 1 by rubber so that the gap 7 is filled with vulcanized rubber 11 which as medium couples the spacer 5 with the rough hole 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an engine inlet pipe that connects a capretor and an inlet boat.

[Technical background of the invention and its problems]

The inlet vibe that connects the carburetor and inlet boat is often made of rubber for vibration-proofing and other reasons. In this case, a synthetic resin core material is used for the flange part to be fastened to the cylinder with bolts, and a metal spacer is interposed on the inner circumferential surface of the bolt insertion hole of the flange part to form an integral structure. . An example thereof is shown in FIG.

The synthetic resin (phenolic resin) core material is molded,
At this time, a metal spacer C is inserted.

In the next step, this core material is integrally molded into the rubber pipe body a.

In the above structure, since the spacer is inserted into the core material, the number of molding steps and cost increases, and since the thermal shrinkage of the synthetic resin and the metal do not match, the space between them loosens after molding and is likely to separate. In addition, when baking and molding the rubber in the next process, the molding is performed as shown in Figure 9, but as shown in Figure 10, there is a protrusion of rubber 9 on the tightening seat of the spacer C, which must be removed one by one. Another problem was that it required a lot of man-hours. d indicates an upper die, e indicates a lower die, and f indicates a guide bin.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an engine inlet pipe whose structure is improved so as to reduce man-hours and costs.

[Summary of the invention]

In order to achieve the above object, the present invention has a pipe body made of rubber, a core material made of synthetic resin arranged in a flange section extending from one end of the pipe body, and a bolt insertion hole formed in the flange section on the inner circumferential surface of the pipe body. In the case where a metal spacer is interposed between the spacer and the core material, a gap is set between the spacer and the core material, and a part of the rubber that forms the pipe body is filled into the gap to join them together. It has a structure characterized by being a medium for

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1, 2, and 3, a pipe body 1 is molded from rubber, and a core material 3 molded from phenol resin is interposed in a flange portion 2 extending from a part of the pipe body 1. A metal pipe-shaped spacer 5 is interposed on the inner peripheral surface of the bolt insertion hole 4 disposed in the portion 2 . This spacer 5
A gap 7 is set between the pipe body 1 and the pilot hole 6 of the core material 3, and is filled with a portion of the rubber of the pipe body 1 to serve as a coupling medium between the two.

That is, the core material 3 is molded with synthetic resin with a prepared hole 6 formed therein.
A spacer 5 is also provided separately. These are placed in a mold as shown in FIG. 3, and integrally molded with the pipe body 1 from rubber. 8 is an upper mold, 9 is a lower mold, and 10 is a guide bin. In this way, the vulcanized rubber 11 is filled in the gap 7, and the spacer 5 is connected to the prepared hole 6 using this as a medium.

FIGS. 4 and 5 show another embodiment. A plurality of vertical slit grooves 12 are formed on the inner peripheral surface of the pilot hole 6a of the bolt insertion hole of the core material 3, and a spacer 5a having the same diameter as the pilot hole 6a is inserted. Vulcanized rubber is filled into the slit groove 12 during rubber molding.

FIGS. 6 and 7 show other embodiments. The figure shows a metal spacer 5b, which has a plurality of vertical slit grooves 13 arranged on its outer surface. As a result, the slit groove 13 is filled with vulcanized rubber to serve as a bonding medium, similar to the previous embodiment.

〔Effect of the invention〕

In the engine inlet pipe of the present invention configured as described above, the step of inserting a spacer when molding the core material is omitted. When molding synthetic resin, especially when using injection molding, it takes a lot of man-hours to place insert parts into the mold one by one, which hinders production automation, but this invention simplifies the production process. . In addition, when rubber is baked and molded, there is an escape route by filling the gap, which prevents the spacer from protruding onto the tightening seat surface, eliminating the need for post-correction of the product, increasing productivity and helping to reduce costs. In terms of product performance, the spacer and core metal are bonded using vulcanized rubber as a medium, so they will not come apart, and when the flange is installed, the tightening force of the bolt is relaxed by the vulcanized rubber layer, and the core metal is bonded to the spacer. Since it does not act directly on the surface, it has the effect of improving durability.

[Brief explanation of drawings]

Fig. 1 is a front view of an inlet pipe showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is an enlarged cross-section of the flange portion showing the state during molding. Figure, 4th
The figure is a front view of the main part of the core material showing another embodiment, FIG. 5 is a sectional view taken along arrow B-8 in FIG. , FIG. 7 is a rear view as viewed from arrow C in FIG. 6, FIG. 8 is a cross-sectional view showing a conventional inlet pipe packaged, and FIG. 9 is a cross-sectional view showing the state of the flange portion during molding.
FIG. 10 is a sectional view of the product. DESCRIPTION OF SYMBOLS 1... Pipe body, 2... Flange part, 3... Core material, 4... Bolt insertion hole, 5.5a, 5b... Spacer, 7... Gap, 12.13...・Slit groove. Vines 1st A Sheep 2nd B 3rd

Claims (1)

[Claims] The pipe body is made of rubber, a synthetic resin core material is interposed in the flange extending from one end, and a metal spacer is interposed on the inner circumferential surface of the bolt insertion hole in the flange. The structure is characterized in that a gap is set between the spacer and the synthetic resin core material, and a part of the rubber forming the pipe body is filled into the gap to serve as a medium for bonding the two. Engine inlet pipe.