Multicylinder engine intake system
First Claim
1. A multicylinder engine intake system comprising:
- a plurality of throttle bodies having intake paths communicating with intake ports of a multicylinder engine, and throttle valves for opening and closing the intake paths;
a plurality of bypasses provided in the throttle bodies, having upstream ends opened to atmosphere or the intake paths on upstream sides of the throttle valves, and having downstream ends opened to the intake paths on downstream sides of the throttle valves; and
a common bypass control valve which opens and closes the bypasses, wherein the bypass control valve is mounted on any of the plurality of throttle bodies;
downstream ends of the bypasses opened in the throttle bodies are formed as throttle holes; and
the diameter of the throttle hole on a side of the throttle body on which the bypass control valve is mounted is smaller than diameters of the throttle holes on other throttle bodies.
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Accused Products
Abstract
A multicylinder engine intake system includes: first and second throttle bodies; bypasses provided in the first and second throttle bodies and having downstream ends opened to intake paths on downstream sides of throttle valves; and a common bypass control valve which opens and closes the bypasses. The bypass control valve is mounted on the first throttle body. Downstream ends of the bypasses opened in the first and second throttle bodies are formed as throttle holes. The diameter of the throttle hole on the side of the first throttle body is smaller than the diameter of the throttle hole on the second throttle body. Thus, it is possible to equalize amounts of first idling air supplied to a plurality of cylinders irrespective of arrangement of the cylinders in an engine even if lengths of a plurality of bypass downstream paths are not equal to each other, while the bypass control valve is mounted on any of the throttle bodies.
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Citations
4 Claims
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1. A multicylinder engine intake system comprising:
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a plurality of throttle bodies having intake paths communicating with intake ports of a multicylinder engine, and throttle valves for opening and closing the intake paths;
a plurality of bypasses provided in the throttle bodies, having upstream ends opened to atmosphere or the intake paths on upstream sides of the throttle valves, and having downstream ends opened to the intake paths on downstream sides of the throttle valves; and
a common bypass control valve which opens and closes the bypasses, wherein the bypass control valve is mounted on any of the plurality of throttle bodies;
downstream ends of the bypasses opened in the throttle bodies are formed as throttle holes; and
the diameter of the throttle hole on a side of the throttle body on which the bypass control valve is mounted is smaller than diameters of the throttle holes on other throttle bodies. - View Dependent Claims (2, 3, 4)
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Specification