Internal-combustion engines – Multiple cylinder – Having rotary output shaft parallel to cylinders
Patent
1989-11-13
1990-12-04
Okonsky, David A.
Internal-combustion engines
Multiple cylinder
Having rotary output shaft parallel to cylinders
123 58A, 123 58AM, F02B 7524
Patent
active
049745557
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a piston engine with parallel cylinders arranged around the driving shaft.
Engines (and pumps) with a so-called tumbling disc are known, in which the longitudinal axis of each cylinder is directed substantially parallel to the driving shaft, and the free extremity of the piston rod of each cylinder engages a surface portion of a disc mounted on such a shaft, such a surface portion including such an angle with said shaft that a reciprocating movement of a piston rod is transformed into a rotating movement of said disc and vice versa.
In such an engine the crank shaft of the normal piston engines having a plurallity of cranks and, as the case may be, a plurallity of bearings, is replaced by the tumbling disc which, in fact, serves as a single crank for all the piston rods, which may lead to a more favourable force distribution, and the above-mentioned structure of such an engine can provide a better space utilization.
Manufacturing such a tumbling disc arranged at the correct angle on the shaft is not simple, and, furthermore, its operation has, with respect to the length of the piston strokes and the piston velocity, must, in each stroke completely correspond with the operation of a crank-shaft engine.
It is an object of the invention to provide an engine of this kind in which the piston movement in each stroke can be fully adapted to the operation desired in that stroke.
To that end the engine according the invention is characterized in that the disc is directed transversely to the shaft, its lateral surface directed to the cilinders being provided with a corrugated surface portion engaged by the extremity of each piston rod, and in that the corrugated surface portion is shaped in such a matter that during each piston stroke the stroke length and/or the piston velocity are adapted to the operation to be performed during the respective stroke.
In particular the reversal joint at the end of the active stroke of a piston can be positioned at a larger distance from the cylinder head than the corresponding point at the end of the suction stroke so that, then, in the vicinity of the former point, an additional exhaust port can be provided in the cylinder wall, by means of which the discharge of the combustion gases can be expedited.
The corrugated surface portion can, in particular, be a separately manufactured part which can consist of a strip which is pressed in the desired shape, and which, if required with the interposition of filling elements, is fixed on the plane disc.
Furthermore the free extremity of each driving rod can be hingedly connected with a guiding arm, which, on the other hand, is hingedly connected with a fixed part of the engine, and, in particular each guiding arm can be provided with a pressure piece contacting the corrugated surface portion of said disc, and, more in particularly, the distance between the fixed hinge point of the guiding arm and the connecting point of the driving rod can be larger than the distance thereof to the pressure piece, and, during the combustion stroke, the pressure piece may assume an orientation which is favourable for the transfer of forces to the corrugated disc portion, and, because of the difference in length of the arms of the lever thus formed, the corrugations can be made less deep for obtaining the same piston displacement.
For obtaining an unambiguous engagement of the driving rod and/or pressure piece, a spring acting thereon can be used.
If required, and for anabling to take up force components directed transversely to the disc in a better way, for each cylinder a supporting means can be provided at the opposite side of said disc, and it is also possible to make said disc symmetrical in respect of the transversal median plane, and to provide, at both sides thereof, cylinders aligned in paris so that the longitudinal component of the forces exerted thereby will be balanced.
The invention will be elucidated below in more detail by reference to a drawing, showing in:
FIG. 1 is a simplified diagrammatical representations of eng
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