JPH10231718A - Blowby gas flow rate control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of noise and the occurrence of wear of a flow rate control part by preventing the occurrence of resonance of a valve due to intake pulsation. SOLUTION: A blowby gas flow rate control valve is formed such that the inlet 2a side is communicated and connected to a locker cover or the like, the outlet 2b side is communicated and connected to an intake manifold, and by moving an inner valve 3 according to a negative pressure at the intake manifold, the sectional area of an inner flow rate control valve 2c is changed, and a flow rate of blowby gas flowing to the outlet 2b side is controlled. In this case, an orifice 5a to suppress resonance of a valve 3 in a way that the influence of intake pulsation is hardly exercised is formed at least at one of the inlet 2a side and the outlet 2b side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a blow-by gas flow control valve.

[0002]

2. Description of the Related Art Conventionally, a blow-by gas flow control valve has a structure as shown in FIG. 4, and a blow-by gas flow control valve 1 has an inlet 2a at the right end of the case 2 in the drawing.
And an outlet 2b is formed on the left end side, and a flow rate control section 2c is formed in a stepped shape inside. A valve 3 is provided so as to be able to move in and out of the flow rate control section 2c. Reference numeral 3 denotes a tapered shape, which is always housed in a state of being urged via a spring 4 to the opposite side to the flow control unit 2c. A rocker cover, a crankcase, or the like is connected to the inlet 2a side, and an intake manifold is connected to the outlet 2b side. In such a blow-by gas flow control valve 1, the valve 3 moves in response to the intake manifold negative pressure and changes the cross-sectional area of the flow control unit 2c to control the flow of the blow-by gas flowing to the outlet 2b side. However, in the related art, the valve 3 resonates due to the intake pulsation, thereby generating abnormal noise and abrasion of the flow control unit 2c, which may cause a problem such as flow rate deterioration. .

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a blow-by gas flow control valve capable of suppressing valve resonance caused by intake pulsation. The gist is that the inlet side is connected to the rocker cover, the crankcase, etc., and the outlet side is connected to the intake manifold, and the valve disposed inside moves according to the intake manifold negative pressure and is formed inside. In the blow-by gas flow control valve configured to be able to control the flow rate of the blow-by gas flowing to the outlet side by changing the cross-sectional area of the flow rate control unit, the influence of the intake pulsation is exerted on at least one of the inlet side and the outlet side. That is, an orifice is formed to suppress the resonance of the valve by making it difficult to receive the valve.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a blow-by gas flow control valve according to a first embodiment. An inlet 2a and an outlet 2b are formed at both ends of a case 2 of the blow-by gas flow control valve 1, and the inlet 2a is a rocker. The outlet 2b is connected to the cover, and the outlet 2b is connected to the intake manifold. A flow control unit 2c is formed in a stepped manner inside the case 2, and a tapered valve 3 is disposed so as to be movable in the lateral direction with respect to the flow control unit 2c. 4 is always urged to the side opposite to the flow control unit 2c by the urging force.

In this embodiment, an orifice 5a having a reduced inner diameter is formed on the outlet 2b side. This orifice 5a is effective in reducing the influence of intake pulsation on the intake manifold side, that is, the occurrence of resonance in the valve 3. In order to reduce the influence of the intake pulsation and effectively suppress the resonance of the valve 3, the inner diameter and the length of the orifice 5a can be tuned and set. Since the orifice 5a is formed, the resonance of the valve 3 is eliminated, generating abnormal noise,
The wear of the flow control unit 2c due to the contact of the valve 3 with the flow control unit 2c is reduced, and the occurrence of flow rate deterioration can be suppressed well.

FIG. 2 shows a second embodiment. In FIG. 2, an orifice 5b having a reduced inner diameter is formed on the inlet 2a side of the case 2, and this orifice 5b is connected to the intake manifold side. The valve 3 is tuned to have an inner diameter and a length that are less susceptible to intake pulsation from the air, and that can favorably suppress resonance of the valve 3, thereby reducing wear of the flow control unit 2 c of the case 2. The configuration is such that generation of abnormal noise can be prevented well, and generation of flow rate deterioration can be suppressed well.

FIG. 3 shows a third embodiment. In FIG. 3, an inlet orifice 5b is formed on the inlet 2a side of the case 2, and an outlet orifice 5a is formed on the outlet 2b side. The two orifices 5a and 5b reliably reduce the influence of the intake pulsation, suppress the resonance of the internal valve 3, and reduce the generation of abnormal noise and the wear of the flow control unit 2c. The inner diameter and length of the orifices 5a, 5b on both sides are appropriately tuned so that the influence of the intake pulsation is not transmitted to the valve 3.

[0008]

According to the present invention, the inlet side is connected to a rocker cover, a crankcase, and the like, and the outlet side is connected to the intake manifold, so that the valve disposed inside moves in response to the intake manifold negative pressure. In the blow-by gas flow control valve configured to be able to control the flow rate of the blow-by gas flowing to the outlet side by changing the cross-sectional area of the flow control unit formed therein, at least one of the inlet side or the outlet side, By forming an orifice that is less susceptible to intake pulsation and suppresses the resonance of the valve, the orifice prevents the valve from resonating due to intake pulsation, suppressing the generation of abnormal noise and the wear of the flow control unit, This has the effect of suppressing the occurrence of flow rate deterioration.

[Brief description of the drawings]

FIG. 1 is a sectional configuration diagram of a blow-by gas flow control valve of a first embodiment.

FIG. 2 is a sectional configuration diagram of a blow-by gas flow control valve of a second embodiment.

FIG. 3 is a sectional configuration diagram of a blow-by gas flow control valve of a third embodiment.

FIG. 4 is a sectional configuration diagram of a conventional blow-by gas flow control valve.

[Explanation of symbols]

 Reference Signs List 1 blow-by gas flow control valve 2 case 2a inlet 2b outlet 3 valve 4 spring 5a, 5b orifice

Claims (1)

[Claims] An inlet side is connected to a rocker cover, a crankcase, and the like, and an outlet side is connected to an intake manifold, and is formed inside by moving a valve disposed therein in response to the intake manifold negative pressure. In the blow-by gas flow control valve configured to be able to control the flow rate of the blow-by gas flowing to the outlet side by changing the cross-sectional area of the flow rate control unit, the influence of the intake pulsation is exerted on at least one of the inlet side and the outlet side. A blow-by gas flow control valve, wherein an orifice is formed to suppress the resonance of the valve by making the valve difficult to receive.