JPH04312277A - Air cleaner hose - Google Patents

Abstract

PURPOSE:To provide an air cleaner hose which generates no air leakage and furnishes an excellent airtightness even in a severe pressurized or pressure reducing areas more severe than a conventional condition. CONSTITUTION:A resin sheet 31 which consists of a synthetic resin insoluble by the heating in a vulcanization is placed between at least one side of the inner side or the outer side in the axial direction of a wire 1, and airtight cloths 21 and 22.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an air cleaner hose installed between an air cleaner and an engine.

0002

2. Description of the Related Art Conventionally, an air cleaner hose 9 shown in FIG. 3 is known. This air cleaner hose is shown in Figure 4.
As shown, a spiral wire 91 and this wire 9
The airtight fabrics 92 and 93 are impregnated with a rubber adhesive and are interposed on the axially inner and outer sides of 1 to maintain airtightness and flexibility.

[0003] This air cleaner hose is installed between the air cleaner and the engine, and is suitably used in pressurization and depressurization regions of approximately ±9.8 kPa.

0004

[Problems to be Solved by the Invention] However, when the conventional air cleaner hose 9 is used in pressurization and depressurization regions severer than about ±9.8 kPa, air leaks from the texture of the airtight cloths 92 and 93. There was a case. For this reason, due to recent improvements in performance, if a car is equipped with a supercharger, for example, the pressurization and depressurization area in the air cleaner hose 9 due to the supercharger becomes more severe than before, and at this time, the air cleaner hose 9 If an air leak occurs, there will be a difference between the amount of air calculated by the air flow meter installed upstream of the air cleaner hose 9 and the amount of air actually taken into the engine, which may prevent an appropriate air-fuel ratio. Conceivable.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air cleaner hose that does not cause air leakage even in severer pressurization and depressurization regions than conventional hoses and has excellent airtightness.

[0006]

[Means for Solving the Problems] The air cleaner hose of the present invention includes a spiral wire and is interposed on the inside and outside of the wire in the axial direction, and is impregnated with a rubber adhesive to maintain airtightness and flexibility. and a resin sheet that is interposed between the airtight cloth and at least one of the axially inner and outer sides of the wire and is made of a synthetic resin that does not melt when heated during vulcanization and improves airtightness. This is a characteristic feature.

[0007] The wire is a metal wire such as a steel wire wound into a spiral shape. As this wire, a general wire used in conventional air cleaner hoses can be used. This wire maintains the air cleaner hose in a cylindrical shape. The airtight cloth is a cloth made of cotton or the like impregnated with a rubber adhesive. As this airtight cloth, a general one employed in conventional air cleaner hoses can be used. This airtight cloth is interposed between the inside and outside of the wire in the axial direction, and maintains the airtightness and flexibility of the air cleaner hose.

The resin sheet is made of a synthetic resin that does not dissolve when heated during vulcanization of the rubber adhesive impregnated into the airtight cloth. For example, a polyester sheet, a PP (polypropylene resin) sheet, etc. can be used as the resin sheet. This resin sheet is interposed between at least one of the axially inner and outer sides of the wire and the airtight cloth to improve the airtightness of the air cleaner hose. This resin sheet is preferably thin enough to improve the airtightness of the air cleaner hose from the viewpoint of flexibility.

[0009]

[Function] In the air cleaner hose of the present invention, a resin sheet made of a synthetic resin that does not dissolve when heated during vulcanization is interposed between at least one of the axially inner and outer sides of the wire and the airtight cloth. The resin sheet prevents air leaking through the grains of the cloth from coming out to the surface, improving airtightness. For this reason, this air cleaner hose is unlikely to cause air leakage from the surface even if it is used in pressurization and depressurization regions that are more severe than about ±9.8 kPa.

0010

[Embodiments] Hereinafter, embodiments 1 and 2 embodying the present invention will be explained with reference to the drawings. (Example 1) As shown in FIG. 1, this air cleaner hose includes a spiral wire 1, an inner airtight cloth 21 interposed on the axially inner side of the wire 1, and an inner airtight cloth 21 interposed on the axially outer side of the wire 1. The resin sheet 31 is interposed between the inner side of the wire 1 in the axial direction and the inner airtight cloth 21. Note that this air cleaner hose has the same appearance as the conventional air cleaner hose shown in FIG.

[0011] The wire 1 is a steel wire having a diameter of 2.3 mm that is spirally wound to have an inner diameter of 57 mm and a pitch of 15 mm. The inner airtight cloth 21 and the outer airtight cloth 22 are
Commercially available cotton cloth is impregnated with an unvulcanized acrylic rubber adhesive as a rubber diameter adhesive. The resin sheet 31 is made of polyester and has a thickness of 0.025 mm.

[0012] This air cleaner hose was manufactured as follows. First, an inner airtight cloth 21 impregnated with a rubber adhesive is wrapped around a cylindrical jig having a predetermined outer diameter and length, and then a resin sheet 31 is wrapped around the jig. Next, the wire 1 is wound around a cylindrical jig around which the inner airtight cloth 21 and the resin sheet 31 are wrapped, and in this state, the outer airtight cloth 22 impregnated with a rubber adhesive is wound over the wire 1. Then, the cylindrical jig together with the outer airtight cloth 22, wire 1, resin sheet 31, and inner airtight cloth 21 is heated at a predetermined temperature and time to vulcanize the rubber adhesive. After this, the cylindrical jig is extracted to obtain an air cleaner hose.

[0013] In this air cleaner hose, wire 1
Since a resin sheet 31 made of polyester is integrally interposed between the axially inner side of the inner airtight fabric 21 and the inner airtight fabric 21 by vulcanization of a rubber adhesive, air leaking from the grains of the inner airtight fabric 21 is absorbed into the resin sheet. 31 prevents it from coming out from the outer airtight cloth 22 and improves airtightness. For this reason,
With this air cleaner hose, no air leakage occurred from the surface even when tested in severe pressurization and depressurization ranges of about ±88 kPa.

In addition, in this air cleaner hose, the surface is made of the same outer airtight cloth 22 as the conventional one, and the resin sheet 31 is thin, so other characteristics such as flexibility and durability are different from those of the conventional one. I was able to perform the same. (Example 2) This air cleaner hose has basically the same structure as that of Example 1, but as shown in FIG. The difference is that there is an intervening point between them. Therefore, the same configurations are given the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[0015] This air cleaner hose was manufactured as follows. First, an inner airtight cloth 21 impregnated with a rubber adhesive is wrapped around a cylindrical jig similar to the above,
Furthermore, wire 1 is wound around it. Next, in this state, a resin sheet 32 is wrapped around the wire 1, and an outer airtight cloth 22 impregnated with a rubber adhesive is further wrapped around the resin sheet 32. Then, the outer airtight cloth 22 and the resin sheet 32
, the cylindrical jig together with the wire 1 and the inner airtight cloth 21 is heated at a predetermined temperature and time to vulcanize the rubber adhesive. After this, the cylindrical jig is extracted to obtain an air cleaner hose.

[0016] In this air cleaner hose, wire 1
A resin sheet 32 made of polyester is integrally interposed between the axially outer side and the outer airtight cloth 22 by vulcanization of a rubber adhesive, and the same operation and effect as in Example 1 can be obtained. was completed.

[0017]

As described in detail above, in the air cleaner hose of the present invention, a resin made of a synthetic resin that does not dissolve by heating during vulcanization is provided between at least one of the axially inner and outer sides of the wire and the airtight cloth. Because the sheet is interposed, air leakage does not occur even in pressurization and depressurization areas that are more severe than in the past, and the airtightness is excellent.

Therefore, for example, if this air cleaner hose is adopted in a car equipped with a turbocharger or supercharger, the pressurization and depressurization area in the air cleaner hose due to the turbocharger will be more severe than before. Even so, air leaks are unlikely to occur in the air cleaner hose, and an appropriate air-fuel ratio can be maintained. As a result, the automobile can exhibit excellent running performance and fuel efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an air cleaner hose of Example 1.

FIG. 2 is a sectional view of an air cleaner hose according to a second embodiment.

FIG. 3 is a side view of a conventional air cleaner hose.

FIG. 4 is a sectional view of a conventional air cleaner hose.

[Explanation of symbols]

1...Wire 21, 22...Airtight cloth
31, 32...Resin sheet

Claims (1)

[Claims] Claim 1: A spiral wire, an airtight cloth impregnated with a rubber adhesive to maintain airtightness and flexibility, interposed on the axially inner and outer sides of the wire, and 1. An air cleaner hose comprising a resin sheet interposed between at least one of the outer sides and the airtight cloth and made of a synthetic resin that does not dissolve when heated during vulcanization and improves airtightness.