Internal combustion engine with variable compression, provided w

Details Internal combustion engine with variable compression, provided w Internal combustion engine with variable compression, provided w

1993-06-03

1995-08-22

Argenbright, Tony M.

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

123195H, F02B 7504

Patent

active

054430437

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to an internal combustion engine and, more particularly, to an internal combustion engine having a cylinder section which may be pivoted with respect to the crankcase section thereof to vary the compression ratio of the engine.
An in-line engine of the above type has a cylinder receiving section (a cylinder block) which is connected tiltably to the crankshaft supporting crankcase section of the engine by a hinge shaft bearing arrangement connecting the parts on one side of the engine. The cylinder receiving section supports a cylinder head which forms the cylinder head of the engine. On the other side of the engine there is a tilting mechanism arranged between the cylinder receiving section and the crankcase section, with which mechanism the cylinder receiving section and the cylinder head connected to it can be inclined laterally relative to the crankcase section.
Because the cylinder receiving section can be inclined (tilted) relative to the crankcase section, the distance between the crankshaft (with adhering pistons) and the cylinders will be variable. The volume of that part of the combustion chamber which is located above the upper limiting surface of the respective pistons, in the upper turning position of the piston (upper dead centre) can therefore be increased by the lateral inclination of the cylinder receiving section relative to the crankcase section. This means that the compression ratio of the engine will be variable, enabling the efficiency of the engine to be optimized for varying driving loads, which results in improved engine performance.
The tilting shaft bearing arrangement between the crankcase section and the cylinder receiving section is, as already mentioned, arranged on one side of the engine, while the tilting mechanism with which the cylinder receiving section can be inclined relative to the crankcase section is arranged on the opposite side of the engine. The tilting shaft bearing arrangement suitably incorporates a lateral inclination shaft which runs parallel with the crankshaft and which is housed in axially separated bearing brackets, which are rigidly connected to the crankshaft section and are positioned in line with each other along the outside of the cylinder receiving section, preferably in its lower region. In the intervals between the bearing brackets are situated bearing lugs in the cylinder receiving section mounted on the sections of the lateral inclination shaft located there. The tilting shaft bearing arrangement therefore consists of the bearing brackets, the lateral inclination shaft and the bearing lugs, which together form a type of longitudinal hinge mechanism between the crankcase section end the cylinder receiving section.
The tilting mechanism on the opposite side of the engine may, for example, incorporate essentially vertically directed rods resembling connecting rods, whose upper ends are swivelled on an upper bearing shaft parallel to the crankshaft and passing along the cylinder receiving section. The lower ends of the rods may then be eccentrically mounted on an eccentric shaft, which is in turn swivelled in bearing brackets rigidly connected to the crankcase section. The upper bearing shaft is in this case supported in the upper region of the cylinder receiving section by means of bearing brackets which are rigidly connected to the cylinder receiving section. The distance between the upper bearing shaft and the bearing brackets housing the eccentric shaft in the crankshaft section may therefore be varied by rotating the eccentric shaft. By varying this distance this side of the cylinder receiving section can be raised (or lowered) relative to the crankcase section, which gives rise to lateral inclination/tilting of the cylinder receiving section relative to the crankcase section.
The bearing brackets connected to the crankcase section for the lateral inclination shaft on one side of the engine, and the bearing brackets similarly connected to the crankcase section for the eccentric shaft, on the o

REFERENCES:
patent: 2770224 (1956-11-01), Ericson
patent: 3633552 (1972-01-01), Huber
patent: 4189193 (1980-02-01), Schumaker
patent: 5025757 (1991-06-01), Larsen
patent: 5218938 (1993-06-01), Miller et al.
patent: 5222467 (1993-06-01), Sasada

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