Internal-combustion engines – Rotating cylinder – Parallel to shaft
Patent
1999-02-09
2000-12-05
Koczo, Michael
Internal-combustion engines
Rotating cylinder
Parallel to shaft
F02B 7526
Patent
active
061552143
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
Very useful forms of axial piston rotary engines were described and illustrated in U.S. Pat. No. 5,813,372, as apparent especially from the assembly drawing of FIG. 11 thereof, and it is to be understood that all the disclosures of that specification are to be deemed part of the disclosure herein to the extent that the same may be pertinent and/or desirable. In such engines a plurality of pistons are mounted in cylinders as part of a rotor assembly, the pistons cooperating with a cam track to cause rotation of the rotor assembly upon combustion of fuel in the cylinder in a manner typical of piston type internal combustion engines. In this specification, the terms "top end" and "bottom end" are used to refer to the combustion end and drive end of the engine as will be understood by those familiar with piston type internal combustion engines.
It is an object of the invention to provide an axial piston rotary engine of the general type described in the said PCT application in which the thrust on the inlet and/or exhaust port seals is reduced.
It is another object of the invention to provide an axial piston rotary engine of the general type described in the said PCT application in which the bottom end of the engine is sealed from the top end so that lubricant required for the cam track, cam follower, cylinder walls and other bottom end components is prevented or at least substantially prevented from entering the combustion chamber via the inlet ports.
It has been known for a considerable period that timing of opening and closing of inlet and exhaust ports has a significant effect on the operation of internal combustion engines and that the efficiency of internal combustion engines can be increased by varying the timing particularly the timing of opening of the inlet ports in operation. It is thus an object of the present invention to provide an axial piston rotary engine of the general type described in the said PCT application which lends itself to variable inlet timing.
It is another object of the invention to provide an axial piston rotary engine which lends itself to variable length piston stroke for varying the compression ratio whereby different fuels can be used effectively.
DISCLOSURE OF THE INVENTION
With the foregoing and other objects in view, this invention in one aspect resides broadly in a rotary internal combustion engine of the type having a rotor assembly supported in a housing for rotation about a longitudinal axis, said housing having two spaced apart end plates and said axis being the axis of rotation of an output shaft operatively connected at one end to said rotor assembly, the other end being free and passing through an aperture in one of said end plates, said rotor assembly including a plurality of pistons mounted for reciprocating movement in respective cylinders arranged in spaced relation around said longitudinal axis, and cam follower means operatively connected to each piston and adapted to coact with undulating cam track means supported around said axis of rotation and between said end plates, means being provided for conveying combustible fuel to and for conveying exhaust gases from the operative ends of the cylinders whereby cyclical combustion of said fuel in said cylinders may impart reciprocation to said pistons with resultant thrust against said cam track means so as to cause rotation of said rotor assembly and output shaft; characterised in that said undulating cam track means includes an annular track mounted to a support stem or shaft disposed substantially centrally thereof and extending in the direction of said longitudinal axis, said support stem or shaft being supported at one end by the other of said end plates and the axis of said annular cam track means being the axis of rotation of said rotor assembly.
In another aspect the invention resides broadly in a rotary internal combustion engine of the type having a rotor assembly supported in a housing for rotation about a longitudinal axis, said housing having two spaced apart end plates and said axis
REFERENCES:
patent: 4213427 (1980-07-01), Di Stefano
patent: 4250843 (1981-02-01), Chang
patent: 5813372 (1998-09-01), Manthey
Advanced Engine Technology Pty LTD
Koczo Michael
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