WO2008001666A1

WO2008001666A1 - Reed valve

Info

Publication number: WO2008001666A1
Application number: PCT/JP2007/062430
Authority: WO
Inventors: Motomichi Tashiro; Tokichi Hirano
Original assignee: Mikuni Corporation
Priority date: 2006-06-28
Filing date: 2007-06-20
Publication date: 2008-01-03
Also published as: JP2009236123A

Abstract

[PROBLEMS] An inexpensive reed valve not requiring fluorocarbon resin coating nor an elastic member at a valve seat section. [MEANS FOR SOLVING PROBLEMS] A valve body (24) to which a reed-shaped valve body (23) is attached is formed of a ferrous metal material such as a cold roll steel sheet (SPC sheet) with a thickness of about 2 to 3 mm. In the forming process, a valve hole (25) and a screw hole (24H) are prepared by punching. A bolt (26) is screwed to the screw hole (24H) to fix the valve body (23) and a stopper (28) to the valve body (24). When the valve body (23) is not bent, it airtightly closes the valve hole (25), and when the valve body (23) is bent by pressure, the valve hole (25) is opened and secondary air flows through the valve hole (25).

Description

Specification

Reed valve

Technical field

The present invention relates to a reed valve that controls fluid using a reed-shaped valve body.

Background art

[0002] Conventionally, a valve body to which a lead-shaped valve body is attached is made by a die force cast such as aluminum or zinc. Since the valve body using aluminum or zinc is soft, if the valve body is struck against the valve body by opening or closing the lead-shaped valve body, the valve body surface will be worn. To solve this problem, conventional reed valves are provided with a rubber elastic body in the valve seat (Patent Document 1) or with a fluorine resin coating on the valve seat or valve body. JP 2004-232712 A

Disclosure of the invention

Problems to be solved by the invention

[0003] However, the fluororesin coating is expensive, and the rubber elastic body is baked on the valve seat, which increases the manufacturing cost and increases the manufacturing time.

[0004] An object of the present invention is to provide a low-cost reed valve that does not require a fluorine resin coating or an elastic member on a valve seat.

Means for solving the problem

[0005] A reed valve according to the present invention includes a main body provided with a valve hole, and a lead-like valve body that opens and closes the valve hole and has a fixed end that is fixed to the main body. It is characterized by being formed from a metal plate material.

[0006] The main body is, for example, an iron-based metal member having a thickness of 2 to 3 mm. The main body is preferably formed of a rolled steel plate or an iron-based sintered metal.

[0007] It is preferable that a locking portion for locking the valve body is provided integrally with the main body. It is preferable that the main body is formed by punching a sheet metal. At this time, a locking portion for restricting the range in which the valve body warps is formed by punching. ο

The invention's effect

As described above, according to the present invention, it is possible to provide a low-cost reed valve that does not require a fluororesin coating or an elastic member on the valve seat portion.

Brief Description of Drawings

FIG. 1 is a schematic diagram showing an outline of a secondary air system in which a reed valve according to an embodiment of the present invention is used.

FIG. 2 is a side sectional view of the valve main body of the first embodiment excluding a housing portion.

FIG. 3 is a perspective view of the valve body of FIG. 2.

FIG. 4 is a side sectional view of a valve body in a second embodiment.

FIG. 5 is a perspective view of a valve body in a second embodiment.

FIG. 6 is a schematic sectional side view when the valve body of the second embodiment is assembled to a housing.

Explanation of symbols

Sylinder head

11 Intake port

12 Intake pipe

13 Air cleaner

14 Exhaust hoat

15 Exhaust pipe

16 Secondary air supply path

17 Air cleaner

18 Air-cut Banolev

19 Reed valve

23 Disc

23B free end

24 Valve body

25 Valve hole

28 Stopper 30 Small piece (locking part)

31 holes

42 pedestal

43 Seal material

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing an outline of a secondary air system in which a reed valve according to an embodiment of the present invention is used. In this embodiment, the secondary air system will be described as an example. However, the system in which the reed valve is used is not limited to the secondary air system, but may be an exhaust system, for example.

An intake pipe 12 is attached to the intake port 11 of the cylinder head 10 of the engine, and outside air is guided into the cylinder via the air cleaner 13. An exhaust pipe 15 is attached to the exhaust port 14, and the exhaust pipe 15 is connected to an exhaust muffler (not shown).

[0013] The exhaust port 14 is provided with a secondary air supply path 16 for supplying secondary air to the exhaust system. Secondary air is supplied to the secondary air supply path 16 via an air cleaner 17, an air cut vano rev 18, and a reed valve 19. The air cut vano rev 18 has a diaphragm chamber that communicates with the intake pipe 12 via the vacuum pipe 20, and when negative pressure is generated at the exhaust port 14, the diaphragm 21 is activated and the control valve 22 of the air cut valve 18 opens. It is said.

[0014] A reed valve 19 provided between the air cut valve 18 and the secondary air supply path 16 is a check valve that allows air to flow from the air cut vane rev 18 toward the secondary air supply path 16, and is an exhaust port. The valve is opened only when negative pressure is generated in 14, the negative pressure is introduced to the air cut vano rev 18, the control valve 22 is opened, and the secondary air is supplied to the exhaust port 14.

Next, the structure of the reed valve 19 of the first embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 is a side sectional view of the reed valve 19 of the first embodiment excluding the housing portion, and shows a state where the valve is slightly opened. FIG. 3 is a perspective view of the reed valve as viewed obliquely from above.

In FIG. 1, since the air cut valve 18 is drawn on the upper side and the secondary air supply passage 16 is drawn on the lower side, the reed valve 19 also supplies the secondary air from the upper side to the lower side. Placed in However, the reed valve 19 in FIGS. 2 and 3 is depicted in such an arrangement that air flows from the lower side to the upper side.

The reed valve 19 is mainly composed of a lead-shaped valve body 23 and a valve body 24 to which the valve body 23 is attached. The valve body 23 is made of a flexible thin plate member (for example, a thin flat stainless steel plate), and the valve body 24 is made of, for example, a ferrous metal material such as a rolled steel plate, more preferably a cold rolled steel plate (SPC plate material). The valve body 24 is formed, for example, by punching an SPC sheet metal having a thickness of about 2 to 3 mm, and a valve hole 25 is formed at the approximate center thereof.

[0018] The valve body 23 is a thin plate large enough to cover the valve hole 25, and is placed so as to cover and close the valve hole 25 on one surface (valve mounting surface) 24S of the valve body 24. One end 23A of the valve body 23 is fixed to the valve body 24 by a fixing means. In this embodiment, the bolt 26 is used as a fixing means, and the valve body 24 is also formed by punching with a screw hole 24H screwed with the bolt 26 together with the valve hole 25.

[0019] The bottom surface of the valve body 23 is brought into close contact with the valve mounting surface 24S by a bolt 26. In FIG. 2, when the air pressure above the valve body 23 (exhaust port side) is higher than the bottom (air cut valve side), the valve body 23 is pressed against the valve mounting surface 24S and passes through the valve hole 25. The flow is interrupted.

On the other hand, in FIG. 2, when the pressure above the valve body 23 (exhaust port side) is lower than that below the air cut valve side (negative pressure is generated in the exhaust system), the valve body 23 has a valve hole. Receive pressure from 25. At this time, since the valve hole 25 is cantilevered at the end 23A, the pressure from the valve hole 25 swells upward in FIG. 2, and the air flows from the lower side (air valve side) to the upper side (exhaust port side). To do. In FIG. 2, the valve body 23 is slightly warped from the valve mounting surface 24S due to the negative pressure generated in the exhaust port 14.

[0021] Note that the valve body 24 is provided with a stopper 28 for restricting the stagnation of the valve body 23 to a certain range. The stopper 28 is made of, for example, a curved plate member, and one end 28A of the stopper 28 is fixed to the valve body 24 by a bolt 26 like the valve body 23. The other end 28B of the stopper 28 is disposed at a position away from the valve mounting surface 24S by a predetermined distance.

That is, the valve body 23 is disposed between the stopper 28 and the valve body 24. When the stagnation of the valve body 23 is increased, the free end 23B of the valve body 23 is connected to the other end 28B of the stopper 28. Contact Thus, the deflection of the valve body 23 is restricted.

[0023] As described above, according to the first embodiment of the present invention, since the valve body is made of a ferrous metal plate that has been subjected to calorie, the wear resistance of the valve body is improved, and the valve of the valve body is improved. It is possible to greatly reduce manufacturing power, cost, and time without the need to provide an elastic member on the seat or to apply a fluororesin coating.

Next, a reed valve according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a side sectional view of the valve body of the second embodiment, and FIG. 5 is a perspective view thereof.

The reed valve of the second embodiment is the same as that of the first embodiment except that the stopper 28 used in the first embodiment is omitted, and a new configuration that replaces the stopper 28 is used. Therefore, the same reference numerals are used for the same configurations as in the first embodiment, and the description thereof is omitted.

[0026] Similar to the first embodiment, the valve body 24 'of the reed valve of the second embodiment is also made of an iron-based metal material such as a cold rolled steel plate (SPC plate material), for example, an SPC of about 2 to 3 mm. The valve hole 25 and the screw hole 24H are formed by punching a sheet metal.

[0027] Further, in the valve body 24 'of the second embodiment, the valve body attached to the valve body 24'.

At the position corresponding to the free end 23B of 23, a locking portion for restricting the warping of the valve body 23 is formed by punching. That is, at the position adjacent to the valve hole 25 of the valve body 24 ′, three sides are punched out in a U-shape to form a U-shaped small piece (locking portion) 30. At this time, the small piece portion 30 is pushed out to the valve mounting surface 24S side and is deformed into, for example, an S shape.

As shown in FIGS. 4 and 5, the lower end portion of the small piece portion 30 is connected to the valve body 24 ′, and the upper end portion extends above the free end 23 B of the valve body 23. . The valve body 23 is disposed between the valve body 24 ′ and the upper end portion of the small piece portion 30, and the warping of the valve body 23 is within a range until the free end 23B is locked by the upper end portion of the small piece portion 30. Be regulated. That is, the small piece portion 30 performs the same function as the stopper 28 of the first embodiment.

[0029] It should be noted that, by punching out the small piece portion 30, the valve body 24 'is formed with a hole 31 penetrating from the opposite surface (upstream surface) of the valve mounting surface 24S to the valve mounting surface 24S. Is done. Therefore, it is necessary to hermetically isolate the hole 31 from the flow path of the reed valve. FIG. 6 shows a schematic cross-sectional view of the configuration when the valve body 24 ′ of the second embodiment is housed in the reed valve housing 40. As shown in FIG. 6, the hole 31 is a hole that communicates from the upstream side to the downstream side of the valve body 24 ′, so that the valve body 23 is blocked unless it is isolated from the flow path 41 of the reed valve. Even when the air is flowing, air will flow through the hole 31.

Therefore, in the reed valve housing 40 of the second embodiment, as shown in FIG. 6, the pedestal portion 42 of the partition wall portion 24A of the valve main body 24 ′ that separates the valve hole 25 and the hole 31 from each other. Is provided. As a result, the hole 31 is isolated from the flow path 41, and the air in the flow path 41 is prevented from flowing downstream through the hole 31. A seal member 43 is interposed between the housing 40 and the valve body 24 ′.

[0032] As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and a separate valve body stopper as in the prior art is not required, which is simplified. The configuration can reduce the number of parts and reduce assembly costs. Further, unlike the prior art, since the stopper extends from the fixed portion to the tip of the valve body and does not require a stopper covering the valve body, the air permeability when the valve hole is opened is improved.

[0033] In the first and second embodiments, the valve body is formed by stamping a rolled steel sheet. However, the valve body may be formed using, for example, an iron-based sintered metal. . Further, the number and shape of the locking portions formed on the valve body of the second embodiment are not limited to those of the present embodiment as long as they can be formed when the valve body is heated.

Claims

The scope of the claims

[1] A main body provided with a valve hole, and a lead-like valve body that opens and closes the valve hole and has a fixed end fixed to the main body. The main body is an iron-based metal plate member. A reed valve characterized by being formed from.

[2] The reed valve according to claim 1, wherein the main body is an iron-based metal member having a thickness of 2 to 3 mm.

[3] The reed valve according to claim 1, wherein the main body is formed of a rolled steel plate or an iron-based sintered metal.

4. The reed valve according to claim 1, wherein a locking portion for locking the valve body is provided integrally with the main body.

[5] The invention according to claim 4, wherein the main body is formed by punching a sheet metal, and a locking portion for restricting a range in which the valve body warps is formed on the main body by the punching process. Reed valve as described.