Multicylinder two-stroke engine intake manifold

Details Multicylinder two-stroke engine intake manifold Multicylinder two-stroke engine intake manifold

1993-08-30

1995-01-03

Kamen, Noah P.

Internal-combustion engines

Intake manifold

Passage to crankcase

123 73R, F02B 7518

Patent

active

053776305

DESCRIPTION:

BRIEF SUMMARY
This invention relates to the construction of the induction manifold through which the incoming air is distributed to the respective crankcase cavities of a multi-cylinder crankcase compression two stroke cycle engine.


BACKGROUND OF THE INVENTION

In many multi cylinder two stroke cycle engines, individual carburetors are provided to regulate the fuel and air supply to the respective crankcase cavities from which the fuel and air is supplied to the respective cylinders of the engine. In fuel injected engines it is customary to provide an air induction manifold having a single air inlet, with each crankcase cavity of the engine communicating directly with the interior of the manifold through a respective one-way valve.
In a two stroke cycle multi-cylinder engine it is known that from the point of view of performance considerations, where the intake of air to the cylinders is provided from a common manifold, the common manifold should have a capacity at least equal to the total swept volume of the engine, and preferably 1.2 to 1.5 times the total swept volume of the engine. The provision of a manifold of this capacity currently substantially increases the overall physical dimensions of the engine assembly together with increases in weight and material costs.


SUMMARY OF THE INVENTION

It is therefore the object of the present invention to provide a two stroke cycle multi-cylinder engine having an air intake manifold construction that has an air capacity appropriate for acceptable performance with limited increase in the overall physical dimensions of the engine.
With this object in view, there is provided a multi-cylinder two stroke cycle internal combustion engine comprising a cylinder block having at least two cylinders therein, an individual crankcase cavity for each cylinder to receive the incoming air charge for the respective cylinder, said crankcase cavities each having respective valve controlled intake ports in a common wall of the cylinder block, an air induction manifold detachably mounted to said common wall of the cylinder block to form therewith a single air induction cavity communicating with each crankcase cavity inlet port, at least part of said air induction cavity being formed within the cylinder block, and at least one inlet port in said manifold for the entry of air to said induction cavity.
Preferably individual passages are formed within the induction manifold to provide the communication between air induction cavity and the respective intake ports.
Conveniently, the cylinder block has a planar face with a first opening therein communicating with an internal cavity within the confines of the block, that cavity being closed apart from said first opening, and respective second openings therein forming, or communicating with, said air intake ports to the respective crankcase cavities. The manifold may also have a planar face complementary to the cylinder block planar face, and complementary first and second openings therein so that with said respective planar faces in abutting relation the two first openings and the respective second openings in the cylinder block and manifold are in registration with one another.
The incorporation of part of the required air capacity of the induction manifold within the cylinder block reduces the overall dimension of the engine assembly in width and/or height across the induction manifold without a sacrifice in the capacity of the air induction cavity and a consequent detraction in engine performance. There is also a resultant saving in material and weight.
The present invention is also applicable to engines operating on cycles other than the two stroke cycle, such as on the four stroke cycle, and thus the invention includes a multi cylinder internal combustion engine comprising a cylinder block having at least two cylinders therein, an air induction manifold mounted on said block to define therewith a single air induction cavity with at least part thereof formed within the confines of the cylinder block, at least one inlet port in said manifold for t

REFERENCES:
patent: 3060914 (1962-10-01), Morand

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