Internal-combustion engines – Multiple cylinder – Cylinders in-line
Patent
1991-10-16
1993-03-02
Okonsky, David A.
Internal-combustion engines
Multiple cylinder
Cylinders in-line
123 65S, F02B 7520
Patent
active
051899957
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION OF INVENTION
This invention relates to a stepped piston engine.
According to the invention 1 provide a stepped piston engine comprising first, second and third stepped cylinders, each cylinder having a larger diameter pumping part, and a smaller diameter working part, and a piston slidable in the cylinder, each piston being coupled to an output shaft of the engine, first transfer passage means to transfer precompressed charge from the larger diameter pumping part of the first cylinder to the smaller diameter working part of the second cylinder, second transfer passage means to transfer precompressed charge from the larger diameter pumping part of the second cylinder to the smaller diameter working part of the third cylinder, and third transfer passage means to transfer precompressed charge from the larger diameter pumping part of the third cylinder to the smaller diameter working part of the first cylinder.
The charge may comprise air, or a mixture of air and fuel.
The invention will now be described with reference to the accompanying drawings in which:
FIG. 1 is an illustrative side view of an engine in accordance with the invention with the pistons shown at 90.degree. to their true positions, so as to illustrate the phase relationship between the pistons and the operating cycle of the engine.
FIG. 2 is an illustrative plan view of an engine in accordance with the invention, showing the arrangement of transfer passage means between the cylinders.
FIG. 3 is an illustrative perspective view of part of an engine of the invention showing in perspective a possible layout of transfer passages.
FIG. 4 is a series of cross sections taken through a practical version of a manifold which may provide the transfer passage layout of FIG. 3.
Referring first to FIGS. 1 to 3 of the drawings, a stepped pist engine comprises first, second and third cylinders 10, 11, 12, each cylinder being of stepped configuration having a larger diameter pumping part 10p,11p,12p and a smaller diameter working part 10w,11w,12w and a respective piston 13,14,15, slidable therein.
Each piston has a larger diameter part 13p,14p,15p, generally of corresponding dimension to the larger diameter pumping part 10p,11p,12p, of the respective cylinders 10,11,12, with appropriate piston rings (not shown) received in grooves in the pumping parts 10p,11p,12p, and a smaller diameter part 13w,14w,15w generally of corresponding diameter to the smaller diameter working parts 10w,11w,12w of the respective cylinders 10,11,12, again with appropriate piston rings (not shown) received in grooves in the working parts 13w,14w,15w.
Each of the pistons 13,14,15, is connected to a common crank shaft 16 which comprises an output shaft from the engine, by respective connecting rods 17, as is well known in the art.
The first cylinder 10 comprises an outlet part 10a which communicates with the larger diameter pumping part 10p leading to a first transfer passage means 20 which comprises an inlet passage part 20i which communicates with the part 10a, and a main passage part 20m from which a pair of branches 20a,20b, extend. The branches 20a,20b extend to opposite sides of the smaller diameter working part 11w of the second cylinder 11 with which they communicate by respective parts 11b,11c.
The second cylinder 11 comprises an outlet part 11a which communicates with the larger diameter pumping part 11p and leads to a second transfer passage means 21 which comprises an inlet passage part 21i which communicates with the part 11a and a main passage part 21m from which a pair of branches 21a,21b extend. The branches 21a,21b, extend to opposite sides of the smaller diameter working part 12w of the third cylinder 12 with which they communicate via respective parts 12b,12c.
The third cylinder 12 comprises an outlet port 12a which communicates with the larger diameter pumping part 12p leading to a third transfer passage means 22 which comprises an inlet passage part 22i which communicates with the part 12a and a main passage part 22m from which a pair of branches 22a,22b
REFERENCES:
patent: 1465885 (1923-08-01), Wege
patent: 1624583 (1927-04-01), Burtnett
patent: 1624584 (1927-04-01), Burtnett
patent: 2230308 (1941-02-01), Olds
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