JPS6115242Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention mainly relates to a secondary air supply device for an internal combustion engine for an automobile.

Conventional internal combustion engine for automobiles (hereinafter referred to as engine)
uses an electric air control valve (hereinafter referred to as EACV) to supply clean air to the intake manifold of the intake system. This EACV is attached to the car body, separate from the engine itself, and sucks in clean air from the clean side of the engine's air cleaner, adjusts the amount, and supplies it to the engine's intake manifold. For this reason, a hose from the air cleaner to the EACV and a hose from the EACV to the intake manifold were necessary and long, and there was a delay in the response of the air sent from the EACV to changes in engine operating conditions. As a countermeasure to this problem, it is possible to increase the diameter of the hose, but this may not be possible because of the hose routing, and it is also disadvantageous in terms of weight and cost.

Furthermore, in order to attach the EACV to the body side, brackets were added, and measures against noise from the EACV were also required.

The purpose of this invention is to shorten the length of hoses, reduce the use of brackets, and provide a noiseless secondary air supply device for engines.

This invention will be explained below based on drawings showing embodiments. In the figure, numerals 1 and 2 indicate the cylinder head and head cover of the engine, respectively, and numeral 3 is a ventilation chamber provided in the upper part of the head cover 2 for draining oil from the blow pie gas. 4
is an air cleaner attached to the upper end of the carburetor 5. The air cleaner 4 is formed by an air cleaner case 4a and a cap 4b, and its interior is divided by a ring-shaped filter element 4c into a dirty side 4d outside the element 4c and a clean side 4e inside.
The clean side 4e communicates with a carburetor 5. 4f is an air cleaner nose. EACV6 is attached to the bottom plate of the air cleaner case 4a. The intake port 6a of the EACV 6 opens upward in the clean side 4e of the air cleaner 4 at a position above the center of the opening of the nose 4f to the case 4a, and the discharge port 6b is connected to the intake manifold 8 of the engine via a pipe or hose 7. is connected to. 6c is a connector connected to a power source. 9
is a heat insulator provided between the carburetor 5 and the intake manifold 8. 10 is a pipe that supplies fresh air from the clean side 4e of the air cleaner 4 to the ventilation chamber 3;
A pipe 1 supplies a mixture of fresh air and blow pie gas from the ventilation chamber 3 to the inside of the heat insulator 9. Note that the suction port 6a of the EACV 6 is located as far away as possible from the opening of the pipe 10 to the clean side 4e so as not to suck in oil due to blowback of the blow pie gas.

In the above configuration, the EACV 6 directly takes in fresh air from the clean side 4e of the air cleaner 4 through its upward intake port 6a, and uses the amount of air required to optimize the air-fuel ratio according to the engine operating conditions. , or the amount of air for exhaust gas purification)
is adjusted and supplied to the intake manifold 8 via the discharge port 6b and the pipe 7. The EACV6 directly sucks in fresh air from the clean side 4e of the air cleaner 4 without going through a pipe, etc. Therefore, fresh air is supplied to the EACV6 without delay in response to changes in engine operating conditions, and the required air amount can be adjusted by the EACV. Can be done. Also, since the pipe or hose 7 is also short,
Fresh air is supplied from the EACV 6 to the intake manifold 8 without delay. Furthermore, since the EACV 6 is built into the air cleaner 4, the noise generated by the EACV 6 is blocked by the air cleaner 4 and does not go outside. In addition, since the intake port 6a of the EACV 6 faces upward and is located above the center of the opening of the air cleaner 4, impurities such as dust in the air flow that enters the case 4a from the nose 4f and is decelerated fall to the bottom of the air cleaner 4 due to its own weight. Also, the air is not inhaled from the suction port 6a. In addition, since the suction port 6a faces upward, it is perpendicular to the air flow sucked into the clean side 4e from the nose 4f of the air cleaner 4 via the element 4c, so that dust and water particles in the air are less likely to be sucked in. . It also has the effect of making it difficult for fuel vapor to be sucked into the EACV 6 when it blows back from the engine to the air cleaner side.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of an embodiment of this invention. 4...Air cleaner, 4c...Clean side, 6...Electric air adjustment valve, 7...Pipe or hose (passage), 8...Intake manifold.

Claims (1)

[Scope of utility model registration request] An electric air regulating valve is installed on the clean side of the air cleaner of an internal combustion engine and has an inlet that opens upward at a position above the center of the opening to the air cleaner in the nose, and the outlet of this air regulating valve is connected to the engine's intake manifold. A secondary air supply device for an internal combustion engine, comprising a passage communicating with the.