Internal-combustion engines – Rotating cylinder – Parallel to shaft
Patent
1996-10-24
1998-09-29
McMahon, Marguerite
Internal-combustion engines
Rotating cylinder
Parallel to shaft
123 43AA, 123 43C, F02B 5700
Patent
active
058133720
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
THIS INVENTION relates to rotary internal combustion engines, and more particularly it relates to an engine having different basic principles from the many rotary engines currently being developed.
BACKGROUND ART
In recent years, the most popular types of rotary engines which have been devised utilise a rotating block having radially disposed cylinders with pistons therein having their outer ends movable relative to guide tracks as shown, for example, in German specification No. 619,955 of Bodda, as well as many United States patents such as U.S. Pat. Nos. 4,003,351, 4,023,536 and 4,974,553. Quite sophisticated design details have been associated with these several proposals which make a useful contribution to the field of such types of rotary engines, including suitable ancillary mechanisms essential to their operation, such as means permitting periodic introduction of air and fuel into the combustion chamber for each cylinder and piston; means for causing combustion of a compressed mixture of air and fuel within the respective combustion chamber, and means permitting periodic exhaust of products of combustion of air and fuel.
We have recently developed a radial-piston type rotary engine of the aforementioned general type, as disclosed in our Australian Provisional Patent Application No. PN6474 which we believe exhibits a number of advantages over current proposals in relation to rotary engines having radial pistons.
Nevertheless, our developments in this currently-popular field of engines has caused us to review another type of rotary engine in which the cylinders are arranged in equally-spaced relationship around a central axis, the pistons being parallel to one another and said axis, drive means being provided for the pistons so that they co-operate with cam track means which will cause a rotor assembly to rotate to drive an output shaft. Examples of this basic type of parallel-cylinders rotary engine are to be found in United States patent specifications such as U.S. Pat. Nos. 4,287,858 of Anzalone, 4,250,283 of Chang and 4,022,167 of Kristiansen. However, all of these are of very cumbersome construction, the pistons requiring elaborate mounting and guiding so that the assemblies are unduly long. This applies particularly where the co-acting cam arrangements are disposed medially of the apparatus as in U.S. Pat. No. 4,287,858. Where separate pistons are employed, each mounted independently, all the usual piston skirts and axial guidance means must be provided so that the assemblies are heavy, costly and cumbersome. It will be noted that disclosures can be derived from the prior published specifications so as to make it unnecessary for our detailing at length the corresponding arrangements in our present proposal where these are similarly required in our ancillary mechanisms, permitting this specification to concentrate on the broad principles, differences and aspects.
The present invention has been devised with the aim of overcoming or alleviating the problems presently encountered with the known types of engines having their piston axes parallel to one another and arranged around a central axis, and it has as its principal object to provide novel drive means which will ensure that maximum efficiency may be obtained using cylinders and pistons of relatively short length.
Another object of the invention is to provide such an engine which will be light in weight, small in size, and consist of a minimum number of parts particularly in respect of the wearing parts.
Yet another object of the invention is to provide such an engine capable of running on petrol or any combustible fuel, but which is particularly suited to slow burning fuels such as diesel.
Yet another object of the invention is to provide a rotary invention of the aforementioned type whereby all fuel will be burned for maximum economy and reduced exhaust emissions. Other objects and advantages of the invention will be hereinafter apparent.
DISCLOSURE OF THE INVENTION
With the foregoing and other objects
REFERENCES:
patent: 3807370 (1974-04-01), Baugh
patent: 4022167 (1977-05-01), Kristiansen
patent: 4287858 (1981-09-01), Anzalone
patent: 5103778 (1992-04-01), Usich
patent: 5209190 (1993-05-01), Paul
Advanced Engine Technology Pty Ltd.
McMahon Marguerite
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