Intake vacuum control device for internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsTakao Fukuhara, Yoshio Iwasa
Life of this patent
Estimating the term…
Abstract
An internal combustion engine is provided with an intake vacuum control device through which the upstream and downstream sides of an intake passageway with respect to a throttle valve are communicable with each other, so that additional air is supplied to the intake passageway downstream of the throttle valve during engine deceleration. The intake vacuum control device is composed of a valve member which is normally biased to be closed by a coil spring which is guided by a cylindrical guide member.
Claims10
In an internal combustion engine having a combustion chamber, means defining an intake passageway providing communication between the combustion chamber and ambient air, and a throttle valve rotatably disposed in the intake passageway,
- an intake vacuum control device comprising:
- an outer cylindrical member formed at its first end with an air inlet opening through which the inside of said outer cylindrical member is communicable with the intake passageway upstream of the throttle valve;
- a valve seat secured to the inner surface of the first end of said outer cylindrical member and adjacent the air inlet opening, said valve seat being made of an elastomeric material;
- a movable valve member seatable on said valve seat;
- a coil spring disposed in said outer cylindrical member to bias said valve member to be seated on said valve seat;
- a cylindrical spring guide member disposed inside the coils of said coil spring, defining a chamber between it and said outer cylindrical member, said chamber being communicated with the intake passageway downstream of the throttle valve and communicable through the air inlet opening with the intake passageway upstream of the throttle valve, said spring guide member having a first end which faces to and is spaced from said valve member to restrict the movement of said valve member;
- and a valve stopper made of an elastomeric material and secured at the first end of said spring guide member so that said valve member is movable between said valve seat and said valve stopper.
In an internal combustion engine having a combustion chamber, means defining an intake passageway providing communication between the combustion chamber and ambient air, a throttle valve rotatably disposed in the intake passageway,
- an intake vacuum control device comprising:
- a casing having air inlet and outlets which are communicated with the intake passageway upstream and downstream of the throttle valve, respectively;
- and
- a vacuum control valve assembly securely disposed in said casing, said assembly including,
- an outer cylindrical member formed at its first end with an air inlet opening located in the vicinity of and communicated with the air inlet of said casing, said outer cylindrical member being formed at its first end with an annular portion defining the air inlet opening of circular shape at the central portion thereof,
- a valve seat secured to the inner surface of the first end of said outer cylindrical member and adjacent the air inlet opening, said valve seat being made of an elastomeric material and of annular shape, said valve seat being secured to the inner surface of said annular portion of said outer cylindrical member and located around the circular air inlet opening,
- a movable valve member seatable on said valve seat, said valve member being formed of a plate and including a circular portion and a plurality of radial projecting portions which are integral with said circular portion, said radial projecting portions being located generally equidistant from each other,
- a coil spring disposed in said outer cylindrical member to bias said valve member to be seated on said valve seat, a cylindrical spring guide member disposed inside the coils of said coil spring, defining a chamber between it and said outer cylindrical member, said chamber being communicated with the air outlet of said casing and communicable through the air inlet opening of said outer cylindrical member with the air inlet of said casing, said spring guide member having a first end which faces to and is spaced from said valve member to restrict the movement of said valve member, and a valve stopper made of an elastomeric material and secured at the first end of said spring guide member so that said valve member is movable between said valve seat and said valve stopper.
Dependencies are inferred from the claim text.