JPS6343378Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a secondary air introduction device for an internal combustion engine that uses a reed valve that opens and closes in response to exhaust pulsation.

FIG. 1 shows a conventional secondary air introduction device, which includes a casing 2 having an opening fixed to a secondary air chamber 1, a plate-shaped reed valve holder 4 supporting a reed valve 3, It is generally composed of a filter element 5 for filtering the secondary air introduced from the reed valve 3, and a secondary air passage communicating with an exhaust passage of an internal combustion engine (not shown) is located at the outlet of the casing 2. 2a. The above reed valve holder 4 is airtightly mounted inside the casing 2 via a frame-shaped rubber seal 6, and the filter element 5 is held in a filter element case 7 consisting of an outer case 7a and an inner case 7b. It is fitted into the opening side of the casing 2. A rubber seal 8 is further disposed between the inner case 7b and the secondary air chamber 1, and the filter element case 7 is sandwiched between this and the reed valve holder rubber seal 6. It is becoming.

However, in such a conventional configuration, for example,
Similar to the device disclosed in No. 152416, the filter element 5 and reed valve holder 4 are stacked one on top of the other, so there is a problem that the overall height becomes large.

As a means for reducing the overall height of the secondary air introducing device, a filter element may be made to protrude into the secondary air chamber, as shown in, for example, Japanese Utility Model Publication No. 17691/1983.

However, in the structure shown in this publication, the filter element protruding into the chamber is fixed to the casing 2, making it difficult to assemble and, furthermore, making it difficult to clean and replace the filter element. There were flaws.

This idea was devised in view of the conventional problems mentioned above, and its purpose is to reduce the overall height of the secondary air introduction device, improve its assembly ease, and improve cleaning of the filter element.
The purpose is to make replacement easy.

That is, the secondary air introduction device for an internal combustion engine according to this invention includes an opening at one end to which the secondary air passage is connected, and an opening at the other end to which the secondary air supply chamber is attached. a casing, a dish-shaped filter element case protruding into the chamber and fitted into the opening, a filter element fitted into the filter element case, and a filter element case in the opening at the other end. A plate-shaped reed valve holder is disposed above and has a reed valve fixed thereto, and the plate-shaped reed valve holder is fitted onto the outer periphery of the reed valve holder to seal between the reed valve holder and the inner wall of the casing. The present invention is characterized in that it includes a frame-shaped rubber seal whose peripheral edge is held between the opening peripheral edge of the chamber, and the rubber seal has a convex portion that abuts and fixes the filter element.

Hereinafter, a specific embodiment of this invention will be described in detail based on FIG. 2.

First, a casing 11 made of a synthetic resin molded product, etc.
The bolt 1 has an outlet (opening) 11a at one end to which the secondary air passage is connected, and the bolt 1 is arranged such that the opening at the other end covers the opening of the secondary air chamber 12.
It is installed at 3. This casing 11
The plate-shaped reed valve holder 14 housed inside has a
A pair of communication holes 15 are opened, and a reed valve 16 for opening and closing the communication holes 15 is fixed together with a reed valve stopper 17, and the reed valve holder 14 has a frame-shaped structure fitted on its outer periphery. It is clamped and fixed between the casing 11 and the secondary air chamber 12 via a rubber seal 18,
At the same time, it is sealed against the inner wall of the casing 11. Further, a deep dish-shaped filter element case 19 is disposed so as to protrude into the chamber 12 so as to fit inside the opening of the secondary air chamber 12, and a filter element 20 is disposed inside the filter element case 19. It is inserted. The outer peripheral edge of the filter element case 19 is held between the rubber seal 18 and the opening edge of the secondary air chamber 12, and the rubber seal 18 is held at the upper end of the filter element 20.
The convex portion 18a provided on the inner peripheral side of the seal 1 comes into contact with the seal 1.
Filter element case 1 due to the elastic force of 8
The filter element 20 is fixedly held within the case 19 by being pressed toward the lower part of the case 19 .

Therefore, according to this configuration, the filter element case 19 is extremely simple with only one side, and the filter element 20 is securely fixed by the convex portion 18a of the rubber seal 18, so that there is no possibility of looseness or air leakage. There is no reason for this to occur.

In addition, the secondary air introduction device is constructed by fitting the filter element case 19 into the opening of the chamber 12, placing the reed valve holder 14 on which the rubber seal 18 is fitted on the outer peripheral edge of the element 19, and then opening the casing 1.
1 to the chamber 12 via the bolts 13, the assembly is completed with the filter element 20 inside the element case 19 fixed by the protrusion 18a of the rubber seal 18, which simplifies the assembly and reduces the overall height. will also become smaller.

Furthermore, since the filter element 20 is inserted into the element case 19 and is only fixed by the protrusion 18a of the rubber seal 18, the bolt 13
It can be easily taken out by removing the element 2.
0 can be easily cleaned and replaced.

As is clear from the above explanation, the structure of the secondary air introduction device for an internal combustion engine according to this invention is much simpler than that of conventional devices, and the number of parts and costs can be reduced. At the same time, the overall height is reduced, and the filter element can be easily cleaned and replaced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional secondary air introduction device, and FIG. 2 is a sectional view of a secondary air introduction device according to this invention. DESCRIPTION OF SYMBOLS 11...Casing, 12...Secondary air chamber, 14...Reed valve holder, 16...Reed valve, 1
8...Rubber seal, 18a...Protrusion, 19...Filter element case, 20...Filter element.

Claims (1)

[Claims for Utility Model Registration] A casing having an opening at one end to which a secondary air passage is connected and an opening at the other end to be attached to the opening of a chamber for supplying secondary air; A dish-shaped filter element case fitted into the opening at the opening, a filter element fitted into the filter element case, and a reed valve disposed above the filter element at the other end opening. A plate-shaped reed valve holder is fitted onto the outer periphery of the reed valve holder to seal between the reed valve holder and the inner wall of the casing, and the periphery of the filter element case is connected to the periphery of the opening of the chamber. A secondary air introduction device for an internal combustion engine, characterized in that the rubber seal has a convex portion that abuts and fixes the filter element.