JPS6034847Y2 - Check valve device in exhaust air suction of internal combustion engine - Google Patents

Description

[Detailed description of the invention] This invention is a device that performs air suction in an exhaust system by utilizing the exhaust pulsation in order to reduce harmful gases in the exhaust gas of an engine. The present invention relates to a check valve device.

When air suction is performed using exhaust pulsation in an engine's exhaust system, rather than branching from a single check valve and suctioning air to the exhaust pipe of each cylinder of the engine, an independent check valve is installed in each cylinder's exhaust pipe. Air suction from the stop valve eliminates interference from exhaust pulsation in other cylinders, allowing more accurate air suction to the exhaust system.

Therefore, conventionally, this type of check valve has been made by combining two check valves into a double check valve device with two valve bodies.
Air is suctioned from each check valve to each exhaust pipe in each cylinder.

However, with this configuration, two valve boxes are required, which not only requires a large number of parts but also requires a large number of assembly steps, resulting in a significant increase in cost.

Furthermore, a large space is required to install each check valve.

In order to solve the drawbacks of the conventional structure, the present applicant proposed a double valve with a V-shaped valve seat body in an earlier application, Utility Model Application No. 168490/1982. The idea was to combine a plurality of valve seats made of flat plate-shaped members with valve holes in an inclined position to create a frustum-shaped valve with an air distribution chamber shared by each valve hole inside and a retaining flange at the bottom. A valve plate that covers the valve hole and a stopper for the valve plate are provided on the outside of the valve seat body, and the flange of the valve seat body is inserted into the valve seat holding step of the valve box. The valve body and valve seat body are brought into contact with each other in a sealed state, and the space between the inside of the valve body and the outside of the valve seat body is divided into multiple valve chambers corresponding to each valve hole, resulting in a compact design. This provides a multiple valve.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings.

In the figure, 1 is a valve box, and the valve box 1 includes a valve seat storage section 31 that stores a portion of the valve seat body 9 except for the flange, and a step section 1 formed at the open end of the valve box 1. '', and the bottom of the valve seat storage portion is provided with outlet holes 7, 7' connected to the exhaust pipes 3, 3' of each cylinder of the engine 2 via pipes 5, 5'.

9 denotes two valve seat parts 17 and 17' made of flat plate-like members.
The valve seat part 17.17' is provided with valve holes 11, 11', and inside thereof there is an air distribution chamber shared by each valve hole. 30 is formed.

Note that in the embodiment, the air distribution chamber 30 is divided into left and right chambers by a wall 10 so as not to have an adverse effect on other valve plates when the valve plate is seated. In this case, these two chambers are communicated through a space inside the cover 16 of the valve box, and become an air distribution chamber shared by each valve hole.

In other words, the air distribution chamber shared by each valve hole may be any configuration in which air is supplied to each valve hole from the same air supply source with a relatively large capacity, and the method of forming it is limited to that of the embodiment. Instead, it is sufficient to select the most suitable one according to the characteristics of the engine to which it is applied, such as removing the wall 10 or providing a communication hole in a part of the wall 10.

Further, the valve seat body 9 has a flange portion 13, and a ring-shaped rubber gasket 14 having a U-shaped cross section is fitted onto the flange portion 13.
It is positioned to be inserted into the stepped portion 1'' of the valve body 1.

Reference numeral 16 denotes a cover having an air suction hole 15, which is attached by an appropriate method to a mounting flange 1' provided on the valve body 1, and which presses and holds the valve seat body 9 within the stepped portion 1''.

The side and tip surfaces of the valve seat body 9 between the original valve holes 11 and 11' are integrally provided with a sealing portion consisting of a protrusion 19 that comes into contact with the inner surface of the valve box 1, thereby sealing the inside of the valve box 1 and the valve seat body. 9 and the outside into two valve chambers 20 and 20', and both valve chambers 20.
Valve seats 17.1 of both valve holes 11.11' in 20'
7' is provided with elastic valve plates 22 and 22', respectively, and the check valve 24
, 24'.

In the figure, reference numerals 26 and 26' indicate stoppers for the elastic valve plates 22 and 22'.

In addition, it is not limited to two valve chambers, but one valve chamber may be divided into three or more valve chambers, and each valve chamber may be provided with an outlet hole to the exhaust passage. In order to partition the valve chamber, a member corresponding to the protrusion 19 may be attached to the inside of the valve box, contrary to the embodiment.

Further, the valve box 1 may be directly attached to the air cleaner instead of the cover 16.

Therefore, by simply inserting the valve seat body 9 into the valve box 1, the inside of the valve box 1 can be divided into a plurality of valve chambers 20 corresponding to each valve hole 11, 11'.
20', and when the valve seat body is inserted, it is positioned by the valve seat holding step 1'' of the valve box, so it can be assembled very easily.

As described above, according to the present invention, the plurality of slanted valve seats each having an air distribution chamber shared by each valve hole and a retaining flange at the bottom, each having a plurality of slanted valve seats made of a flat member having valve holes, are provided. A valve box is composed of a frustum-shaped valve seat body configured with a frustum-shaped valve seat body, and a valve box that includes a valve seat body holding step portion and a valve seat storage portion that accommodate the frustum-shaped valve seat body,
A valve plate that covers the valve hole and a stopper for the valve plate are provided on the outside of the valve seat body, and the valve seat storage portion is arranged such that the retaining flange of the valve seat body is connected to the valve seat retaining stage of the valve box. When inserted into the valve seat part, the valve seat part and the valve seat storage part come into contact, and the shape is such that the space between the inside of the valve box and the outside of the valve seat body is divided into a plurality of valve chambers corresponding to each valve hole. At the same time, each valve chamber has an outlet hole connected to the exhaust passage of each cylinder, so just by inserting the valve seat body into the valve box, the inside of the valve box can be reliably aligned with each valve hole. The valve chamber can be divided into multiple valve chambers, and the valve seat holding step is provided, so positioning is easy and the valve seat does not shift in position, making assembly extremely easy. It can be done.

In addition, according to the present invention, the space inside the valve seat body surrounded by the valve seat parts can be used as an air distribution chamber for each valve chamber by combining a plurality of valve seats in a frustum shape, and the air distribution chamber can be used to some extent. Since it can be formed large, the whole can be made very compact, and even if the outlet holes of each valve chamber are connected to the exhaust passages of cylinders with different phases, there is almost no interference between the valves corresponding to each cylinder, and air suction can be achieved properly. It is also possible to make the volume of the air distribution chamber act as a resonator to eliminate pulsations and reduce noise.

Furthermore, since it does not have a structure in which bolts or the like are directly tightened, it is easy to equalize the contact surface load between the valve seat body and the valve box, and the sealing performance is also extremely excellent.

Therefore, since the number of parts can be reduced and it can be formed in a narrow space, superior effects not found in conventional devices can be obtained in terms of ease of assembly, cost, space, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line 1--2 of FIG. 1... Valve box, 1''... Valve seat holding step, 2... Engine, 3, 3'... Exhaust pipe,
5, 5'... Pipe line, 7.7'... Outlet hole, 9... Valve seat body, 11, 11'...
Valve hole, 13... Flange, 17, 17'...
・Valve seat part, 20.20'... Valve chamber, 22, 22
'... Valve plate, 26, 26'... Stopper, 30... Air distribution chamber, 31... Valve seat storage section.

Claims (1)

[Scope of utility model registration request] A truncated conical valve seat body, which has an air distribution chamber shared by each valve hole inside and a holding flange at the bottom, and is composed of a plurality of inclined valve seat parts made of a flat plate-like member having valve holes; , a valve box consisting of a valve seat holding step portion for housing the frustum-shaped valve seat body and a valve seat storage portion, and a valve plate covering a valve hole and a valve plate disposed outside the valve seat body. A plate stopper is provided, and the valve seat storage section is arranged so that when the retaining flange of the valve seat plate is inserted into the valve seat body holding stepped section of the valve box, the valve seat and the valve seat storage section are connected to each other. are in contact with each other, dividing the space between the inside of the valve box and the outside of the valve seat body into a plurality of valve chambers corresponding to each valve hole, and each valve chamber has an exhaust passage for each cylinder. A check valve device in the exhaust air suction of an internal combustion engine that has a connected outlet hole.