JPS5856363Y2 - Air cleaner for engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cleaner for an engine, and more particularly to an air cleaner for an engine equipped with an air-fuel ratio control valve.

In order to prevent the air-fuel mixture supplied to the engine from becoming too rich when the engine decelerates, conventional air-fuel ratio control valves introduce additional air into the engine's intake system to optimize the air-fuel mixture at that time. known from.

BACKGROUND ART Conventionally, an air-fuel ratio control valve is generally attached to an outer wall of an engine or the like via a fitting.

Therefore, a dedicated air filter must be provided at the air intake port of the air-fuel ratio control valve, which increases the size of the device and requires cleaning of the air filter.

In addition, the air-fuel ratio control valve produces intake noise when introducing additional air,
Unfavorable in terms of noise reduction.

In view of the above-mentioned points, it is an object of the present invention to provide an engine air cleaner that can omit the air filter of the air-fuel ratio control valve and can promote noise reduction.

According to the present invention, this purpose is to provide an engine air cleaner which has an annular filter element, the inside of the ring of the filter element is a clean side, and an air outlet opening to the clean side is provided. This is achieved by an engine air cleaner characterized in that an air-fuel ratio control valve for supplying additional air to the engine intake system during deceleration is disposed in a space inside the ring of the filter element.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

The attached FIG. 1 is a plan sectional view showing one embodiment of the engine air conditioner according to the present invention, and FIG. 2 is a sectional view taken along line II--II in FIG. 1.

In the figure, reference numeral 1 indicates a cylindrical casing of an air cleaner, and one end of an air intake nose 2 is connected to a part of the outer periphery of the casing 1.

Inside the casing 1 is an annular filter element 3.
An air outlet 4 is provided in the center of the clean side inside the filter element 3, and this air outlet 4 is connected to a horn portion of a vaporizer 5.

The carburetor 5 has a primary bore 6 and a secondary bore 7 in parallel along an imaginary axis that is perpendicular to the cylinder arrangement direction of the engine.

At the periphery of the air outlet 4 on the clean side, an air-fuel ratio control valve 8 and a hot idle compensator 15 are located at substantially symmetrical positions with respect to an imaginary plane perpendicular to the cylinder arrangement direction of the engine. It is located.

The air-fuel ratio control valve 8 has a port 11 in its diaphragm device 9 for introducing intake pipe negative pressure, and one end of a hose 12 for supplying the intake pipe negative pressure is connected to this port 11.

The air-fuel ratio control valve 10 opens for a predetermined period of time when a relatively large intake pipe negative pressure is introduced into the diaphragm chamber 9, and supplies air from the air intake port 10 to the air supply port 13 on the clean side of the air cleaner. It is designed to be supplied to

The air supply port 13 is connected by a hose (not shown) to an additional air injection port used in the intake system of the engine.

Further, the hot idle compensator 15 has a thermowax element 16, which opens as the intake air temperature rises and guides the air from the clean side to the port 20 through the atmospheric intake port 17. .

The port 20 is connected to the port 14 provided in the air-fuel ratio control valve 8 by a hose 21, and the air guided to the port is passed through the hose 21. Air-fuel ratio control valve 8 via port 14
from which air is supplied via an air supply port 13 and a hose (not shown) to an additional air injection port of the engine.

The hot idle compensator 15 is also provided with a port 18, which is connected via a hose 19 to a diaphragm chamber of a negative pressure motor for controlling warm air introduction, which is not shown in the figure, and is connected to the diaphragm chamber of a negative pressure motor for controlling the intake air. The intake pipe negative pressure or the atmosphere is introduced into the diaphragm chamber.

Further, a blow-by port 23 is provided at the periphery of the air outlet 4 on the clean side.

In this case, in order to prevent impurities contained in the blow-by gas from the blow-by port 23 from adhering to the valve seat of the air-fuel ratio control valve 8,
0 is the blow-by port 23 as shown in the figure.
It is preferable that the filter element 3 is open toward the filter element 3 on the side opposite to the side on which the filter element 3 is provided.

Further, in view of the distribution characteristics between the cylinders of the engine, the blow-by port 23 is arranged so that its center is located on a virtual plane that includes the central axis of the air outlet 4 and is perpendicular to the cylinder arrangement direction of the engine. It is preferable.

As mentioned above, since the air-fuel ratio control valve and the hot idle compensator are provided on the clean side of the air cleaner, it is no longer necessary to provide an air filter at the air intake port of each of these valves, simplifying their structure. can.

Furthermore, since the air cleaner acts as a muffler, the level of intake noise from each valve leaking to the outside is reduced.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view showing one embodiment of an engine air cleaner according to the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.
FIG. 1-Casing, 1-Air intake nose, 3-Filter element, 4-Air outlet, 5-Carburetor, 6-Primary bore, 7-Secondary bore, 8-Air-fuel ratio control valve,
9~Diaphragm device, 10~Atmospheric intake port, 11
~Intake pipe negative pressure intake port, 12~Hose, 13~Air supply port, 14~Port, 15~Hot idle compensator, 16~Thermowax element, 17~
Atmospheric intake port, 18~port, 19~hose, 20
~Port, 21~Hose, 23~Blow-by port.

Claims (1)

[Scope of utility model registration request] An engine air cleaner that has an annular filter element, the inside of the ring of the filter element has a clean side, and is provided with an air outlet that opens on the clean side to supply additional air to the engine intake system during deceleration. An air cleaner for an engine, characterized in that an air-fuel ratio control valve for supplying the air-fuel ratio is arranged in a space inside a ring of the filter element.