JP2501435Y2 - Secondary air supply device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for supplying secondary air for purifying exhaust gas in an exhaust system to an exhaust system in an internal combustion engine.

[Conventional technology]

In recent internal combustion engines, a check valve that is separate from the internal combustion engine is provided in the secondary air supply line connected to the exhaust system of the internal combustion engine. The secondary air is introduced into the exhaust system by opening and closing by utilizing the pulsation of (1) to purify unburned harmful components in the exhaust gas by oxidation reaction.

Further, Japanese Utility Model Laid-Open No. 63-108510 as a prior art is, in the above-mentioned secondary air supply device, at a site upstream of the check valve in the secondary air supply pipeline to the exhaust system,
It is proposed to increase the supply amount of the secondary air and reduce the noise generated by the introduction of the secondary air by providing a chamber having an appropriate internal volume which is configured separately from the internal combustion engine. .

[Problems to be solved by the device]

However, in this prior art, when a check valve and a chamber, which are separately formed from the internal combustion engine, are provided in series in the secondary air supply line to the exhaust system, each of them is separately provided. The check valve is required to have its valve case and a lid for the valve case, while the chamber also has a hollow body. In addition to the need for a lid for the hollow body, the check valve and the chamber need brackets for supporting each separately, and in addition to this, a check valve and a chamber are required. Since a pipe line to be connected is also required, the number of parts is remarkably increased, the number of assembling steps and the number of mounting steps are increased, and not only the manufacturing cost is significantly increased, but also the size is increased.

The present invention solves the problems of the prior art in the case where a check valve and a chamber, which are separate from the internal combustion engine, are provided in series in the secondary air supply line to the exhaust system, respectively. It is an object of the present invention to provide such a device.

[Means for Solving the Problems]

In order to achieve this object, the present invention provides, in a secondary air supply conduit from an intake point of atmospheric air such as an air cleaner to an exhaust system of an internal combustion engine, a check valve configured separately from the internal combustion engine, In the secondary air supply device, which is also provided with a chamber that is formed separately from the internal combustion engine so that the chamber is located on the upstream side of the check valve, a valve case in the check valve, and the chamber While forming a main body portion integrally formed with the hollow body in the above, the lid portion joined to the main body portion is integrated with a lid body for the valve case in the check valve and a lid body for the hollow body in the chamber. And a secondary air introducing passage from the inside of the chamber to the check valve is further provided in the lid portion. "

[Operation and effect of device]

According to this structure, the valve case in the check valve and the hollow body in the chamber can be made into one part called a main body portion, while the lid body in the check valve and the lid body in the chamber can be combined with each other. In addition to being able to be one part called, by providing a secondary air introduction passage from the inside of the chamber to the check valve in the lid portion,
Since the chamber and the check valve can be connected simply by joining the lid portion to the main body portion, a component for connecting the chamber and the check valve can be omitted. Both the chamber and the chamber can be supported simultaneously.

Therefore, according to the present invention, when the check valve and the chamber, which are separate from the internal combustion engine, are provided in series in the secondary air supply line from the air cleaner to the exhaust system, the check valve and the parts of the chamber are provided. Since the number of points can be reduced and the number of steps required for assembling and mounting can be reduced, the manufacturing cost can be greatly reduced and the size can be reduced.

〔Example〕

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings (FIG. 1). In the drawing, reference numeral 1 indicates an air cleaner for an internal combustion engine (not shown), and reference numeral 2 indicates an exhaust system from the internal combustion engine. Reference numeral 3 indicates a check valve, and reference numeral 4 indicates a chamber.

The chamber 4 is connected with a secondary air introduction pipe line 5 from the air cleaner 1, and the check valve 3 is connected with a secondary air supply pipe line 6 to the exhaust system 2. .

The main body portion 10 is formed by integrating the valve case 8 having the valve body 7 of the check valve 3 and the hollow body 9 of the chamber 4, and a plurality of main body portions 10 are provided. Lid part joined with bolt 11 of
Reference numeral 12 denotes a lid body for the valve case 8 of the check valve 3.
13 and a lid for the hollow body 9 in the chamber 4
14 is integrally formed, and a secondary air introduction port 16 is provided to connect the inside of the chamber 4 and the inlet chamber 15 to the valve body 7 of the check valve 3.

In such a configuration, the pulsation of the exhaust gas in the exhaust system 2 is transmitted to the valve body 7 in the check valve 3 via the secondary air supply pipe line 6, and the valve body 7 is repeatedly opened and closed, whereby the air cleaner is released. The secondary air from 1 flows into the chamber 4 through the secondary air introducing pipe 5, and from the inside of the chamber 4 through the secondary air introducing port 16 to the valve body 7 of the check valve 3. After flowing into the inlet chamber 15, it passes through the valve body 7 and is supplied into the exhaust system 2 through the secondary air supply pipe line 6.

In this case, the valve case 8 in the check valve 3 and the hollow body 9 in the chamber 4 are integrated into one component called the main body portion 10, and the lid 13 in the check valve 3 and the chamber 4 are integrated. That the lid 14 and the lid portion 12 are integrated into one component, and the lid portion 12
In addition, since the secondary air introducing port 16 for guiding the secondary air from the chamber 4 to the check valve 3 is bored, the number of parts can be significantly reduced as compared with the case where these are formed as separate parts. Also, both the check valve 3 and the chamber 4 can be simultaneously supported by one support member.

In the above embodiment, the case where the control valve for adjusting the supply amount of the secondary air to increase / decrease according to the load of the internal combustion engine is not provided is shown. Can also be provided.

FIG. 2 shows an embodiment in this case, and the lid portion 12
In the inside of the lid 13 for the check valve 3, a valve seat 17a is formed, and a diaphragm 17c is installed inside a diaphragm case 17b that is hermetically sealed above the valve seat 17a. Further, inside the diaphragm case 17b, The diaphragm 17c is provided with a spring 13d configured to urge the diaphragm 17c against the valve seat 17a so as to close the valve seat 17a, thereby constituting a control valve 17 for secondary air. In the diaphragm case 17b, an intake negative pressure in an intake manifold (not shown) in the internal combustion engine is transferred to the negative pressure transmission passage 18
In the low load region in which the intake negative pressure increases toward the vacuum side, the diaphragm 17c is separated from the valve seat 17a against the spring 17d by the intake negative pressure, and the secondary air to the exhaust system 2 is introduced. It is configured to supply air.

The embodiment shown in FIG. 2 has a secondary air control valve for the lid portion 12 in the embodiment shown in FIG.
Since 17 is provided, the lid portion 12 provided with the secondary air control valve 17 and the lid portion 12 not provided with the secondary air control valve 17 need only be appropriately replaced with respect to the main body portion 10. ,
A secondary air supply device with a secondary air control valve or a secondary air supply device without a secondary air control valve can be easily formed.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional front view of the first embodiment, and FIG. 2 is a vertical sectional front view of the second embodiment. 1 ... Air cleaner, 2 ... Exhaust system, 3 ... Check valve, 4
…… Chamber, 5 …… Secondary air introduction line, 6 …… Secondary air supply line, 7 …… Check valve valve body, 8 …… Check valve valve case, 9 …… Cavity cavity Body, 10 ... main body part,
12 …… Lid part, 13 …… Check valve lid, 14 …… Chamber lid, 16 …… Secondary air inlet port, 17 …… Secondary air control valve.

Claims (1)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. A secondary air supply conduit from an intake point of atmospheric air such as an air cleaner to an exhaust system of an internal combustion engine,
Secondary air supply in which a check valve formed separately from the internal combustion engine and a chamber also formed separately from the internal combustion engine are provided so that the chamber is located upstream of the check valve. In the device, a main body portion is formed by integrating a valve case in the check valve and a hollow body in the chamber, and a lid portion joined to the main body portion is provided with a lid for the valve case in the check valve. A body and a lid for a hollow body in the chamber are integrally provided, and further, a secondary air introduction passage from the inside of the chamber to the check valve is provided in the lid portion. Secondary air supply device.