JPS6224138Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention provides air suction using the exhaust pulse in the exhaust system in order to reduce harmful gases in the exhaust gas of an internal combustion engine. The present invention relates to a check valve device provided in the air suction passage.

(b) Prior art When air suction is performed using exhaust pulsation in the exhaust system of an internal combustion engine, rather than branching from a single check valve and directing air suction to the exhaust pipe of each cylinder of the engine, air suction is applied to the exhaust pipe of each cylinder. It is better to provide air suction from an independent check valve for each cylinder, without interference from exhaust pulsation in other cylinders, and to ensure accurate air suction to the exhaust system. However, providing an independent check valve for each cylinder not only increases cost, but also allows for more accurate air suction to the exhaust system. , it takes a lot of man-hours to assemble, and also requires a large space to install each check valve.

Therefore, conventionally, this type of check valve, as shown in Japanese Utility Model Application Publication No. 51-42328, has been constructed 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, since this double check valve device also requires two valve boxes, it not only has a large number of parts, but also requires many man-hours for assembly, resulting in a significant increase in cost.

In addition, when using a multiple system with two or more valves, the opening timing of the elastic valves that open and close due to exhaust pulsation may overlap even in different cylinders, so the opening and closing vibrations of each elastic valve resonate with each other and amplify each other. This propagates to the valve box, which is made of thin sheet metal, etc., and vibrates, which generates radiated noise, which becomes a source of large noise.

(c) Purpose of the invention The present invention was made in order to solve the above-mentioned drawbacks of the conventional device, and provides an air suction check valve device that is extremely compact, easy to assemble, and has low noise. It is something to do.

(d) Structure of the device In order to achieve the above-mentioned purpose, this device has a plurality of valve holes, surrounds a gasket with a U-shaped cross section, is formed into a flat plate, and is arranged in the direction of flow of the air suction. A valve seat body installed substantially vertically, a valve box provided with a stepped portion for holding the valve seat body, and the inside of the valve box divided into a plurality of valve chambers corresponding to a plurality of valve holes. a protrusion that protrudes from the valve seat body, the valve box, or both, and whose tip abuts a sealing material;
It consists of a cover member having an air inlet, which is attached to the valve box with the valve seat body sandwiched therebetween, and an outlet hole connected to each valve chamber and the exhaust passage of each cylinder.

(E) Embodiments The present invention will be explained below based on embodiments shown in the drawings.

In the figure, 1 is a valve box with outlet holes 1a, 1a', 1a'' connected to exhaust pipes 3, 3', 3'' in each cylinder of the engine 2 via pipes 4, 4', 4''. In addition, a stepped portion 1b for holding a valve seat body 6, which will be described later, is provided.

Reference numeral 6 denotes a valve seat body formed in a flat plate shape, which has three valve holes 6a, 6a', 6a'', elastic valve plates 6b, 6b', 6b'' for opening and closing each valve hole, and each valve Stoppers 6c, 6c'6c'' for regulating the opening degree of the plate are provided.The peripheral edge 6d of the valve seat body 6 is connected to the stepped portion 1 of the valve body 1 via a rubber packing 7 having a U-shaped cross section.
inserted into b. At this time, the flat valve seat body 6 is substantially perpendicular to the flow of air suction from the air inlet 10a to the outlet holes 1a, 1a', 1a''.

The valve body 1 has valve holes 6a, 6a', 6 inside the valve body.
Partition wall 1 partitioning into valve chambers 8, 8', 8'' corresponding to a''
c, 1c' are integrally formed, and this partition wall 1
By bringing c, 1c' into contact with the valve seat body 6 through sealing materials 9, 9', sealing between the valve chambers 8, 8', 8'' is ensured.

Reference numeral 10 denotes a cover having an air introduction hole 10a, which is attached to the flange 1d of the valve body 1 in such a manner as to sandwich the valve seat body 6 with the stepped portion 1b.

In the above structure, the function and effect of the valve seat body 6 are very easy to position because the valve seat body 6 is inserted into the stepped portion 1b of the valve box 1, and the inside of the valve body 1 is Simply insert the valve hole 6 into each valve hole.
Since it is divided into valve chambers 8, 8', and 8'' corresponding to valve chambers a, 6a', and 6a'', there is no need to use multiple valve boxes.
It is extremely superior in terms of number of parts, ease of assembly, cost, space, etc. In addition, once the valve seat body 6 is inserted into the valve box 1, it is fixed by the elasticity of the packing 7, so when the cover 10 is attached, the position of the valve seat body 6 may shift, or the valve seat body 6 may be inserted into the valve box 1. It will not get caught in the cover 10. Even when replacing the valve seat body 6, it can be replaced regardless of the orientation of the valve device. In addition, since there is a packing 7 and sealing materials 9, 9' in the contact area between the valve seat body 6 and the valve box 1, the vibrations of the elastic valve plates 6b, 6b', 6b'' are directly transmitted to the valve box. Therefore, the amount of noise generated is extremely low.

In addition, inserting the valve seat body 6 into the stepped portion 1b of the valve box 1,
Since it is pressed down by the cover 10, the valve body and the valve seat body come into contact with each other in an L-shaped cross section, and the load on the contact area is also uniform, so it is extremely excellent in terms of sealing performance. .

The valve seat body 6 has air inlets 10 to outlet holes 1a, 1.
Since it is approximately perpendicular to the air suction flow to a', 1a'', the length of the valve body can be shortened compared to the case where the valve seat body 6 is oblique to the flow, and the valve device can be made compact.

Further, the valve chambers are not limited to three, but may be divided into two valve chambers or four or more valve chambers. A protrusion may be provided between the valves to seal the valve body and the valve seat body.

Note that the air cleaner body may be used as the cover.

(c) Effects Because the present invention has the above-described configuration, it is possible to provide an air suction check valve device that is extremely compact, easy to assemble, and produces little noise.

[Brief explanation of the drawing]

The drawing is a sectional view of the apparatus according to the present invention. 1... Valve box, 1a, 1a', 1a''... Outlet hole, 1
b...Valve seat body holding stepped part, 1c, 1c'...Protrusion part,
3, 3', 3''...exhaust pipe, 6...valve seat body, 6a,
6a', 6a''... Valve hole, 7... Packing, 8,
8', 8''... Valve chamber, 9, 9'... Seal material, 10
......Cover member, 10a...Air introduction hole.

Claims (1)

[Scope of utility model registration request] A valve seat body that has a plurality of valve holes, surrounds a gasket having a U-shaped cross section, is formed into a flat plate, and is installed approximately perpendicular to the flow direction of the air suction; and a valve seat body that holds the valve seat body. a valve box having a stepped section for separating the valve box into a plurality of valve chambers corresponding to a plurality of valve holes; An internal combustion engine consisting of a protrusion that comes into contact with a material, a cover member that has an air inlet that is attached to the valve box while holding the valve seat body, and an outlet hole that is connected to the exhaust passage of each cylinder in each valve chamber. check valve device in the exhaust air suction of