US 4,448,164 AGranted

Intake passage construction for internal combustion engines

AssigneeSuzuki Jidosha Kogyo Kabushiki Kaisha

InventorTokuzi Ishida

Life of this patent

Estimating the term…

Loading patent…

Abstract

An intake passage construction for an internal combustion engine has a primary intake passage for supplying an air-fuel mixture when the engine operates under a full range of loads and a secondary intake passage for supplying an air-fuel mixture when the engine operates under relatively high loads. A secondary slow fuel passage has a pair of fuel supply ports opening into the secondary intake passage, and a fuel drain passageway extends from one of the fuel supply ports and has a fuel discharge port opening into the primary intake passage. Ambient air can be introduced into the fuel drain passageway in response to a vacuum developed in the primary intake passage so that fuel can be drained from the secondary slow fuel passage to prevent vapor lock therein. The fuel discharge port of the fuel drain passageway may open into an induction pipe.

Claims9

Dependent claims

An intake passage construction for an internal combustion engine having a combustion chamber, comprising:

(a) a primary intake passage opening into the combustion chamber for supplying an air-fuel mixture when the engine operates under a full range of loads;
(b) a secondary intake passage opening into the combustion chamber for supplying an air-fuel mixture when the engine operates under relatively high loads;
(c) a secondary throttle valve pivotably mounted in said secondary intake passage for controlling the flow of the air-fuel mixture through said secondary intake passage;
(d) a secondary slow fuel passage connected to a fuel supply and having a pair of fuel supply ports opening into said secondary intake passage adjacent to said secondary throttle valve;
(e) a fuel drain passageway means communicating with one of said pair of fuel supply ports for discharging fuel from said secondary slow fuel passage to remove fuel vapors from the secondary slow fuel passage;
and
(f) means for introducing air into said fuel drain passageway means as a result of a vacuum developed in said primary intake passage.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/430,066Filed 30 Sep 1982
Priority: JP 56-18098113 Nov 1981
Granted: 15 May 1984
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02M 3/055
Under conditions where engine is driven instead of driving, e.g. driven by vehicle running down hill: fuel flow cut-off by introducing air, e.g.…
F02B 31/08
Modifying induction systems for imparting a rotation to the charge in the cylinder: having multiple air inlets
F02M 11/00
Multi-stage carburettors, register-type carburettors, i.e. with slidable or rotatable throttling valves in
F02M 11/02
Multi-stage carburettors, Register-type carburettors, i.e. with slidable or rotatable throttling valves in which a plurality of fuel nozzles,…:…