Internal-combustion engines – Multiple cylinder – Cylinders radiating
Patent
1998-02-13
1999-11-23
Kamen, Noah P.
Internal-combustion engines
Multiple cylinder
Cylinders radiating
123 555, 123 557, 1231973, 1231974, F16H 2134
Patent
active
059881216
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a Diston engine having a hypocycloidal piston stroke transmission with a Watt's guide, particularly with pistons in opposed cylinders. An engine of this type is known from German Patent Document DE-A 41 08 311.
It is known that the connecting center point of a Watt's guide describes a precise straight-line path only by means of connecting control arms of an infinite length, whereas, in the case of real control arms of particularly short lengths, as, for example, on a piston engine, the connecting center point, along the overall stroke of the oscillating connecting rod, describes a path curve which is curved several times with respect to the fictitious or ideal straight guiding line and changes this straight guiding line.
The essay "Calculating Watt's Straight-Line Transmissions" in Volume 1/1980 of the journal of the German Democratic Republic with the title "Maschinenbautechnik" ("Mechanical Engineering Technology") shows particularly by means of a nomogram illustrated in Page 27 possibilities of adapting such a path curve in its deviations and courses according to the application of the Watt's guide as a function of its transmission parameters to the desired quality, of straight line guiding. It is the main goal to minimize the transverse deviations of the path curve of the connecting center point from the fictitious or ideal straight guiding line and to render the deviations uniform.
As it was found, such a design of a Watt's guide used in a hypocycloidal piston stroke transmission results in transverse displacements of such different dimensions of the stroke eccentric connected with respect to the drive with a piston push rod that any piston guiding is affected negatively.
It is an object of the invention to improve, in the case of a piston engine of the above-mentioned type having a hypocycloidal piston stroke transmission with a Watt's guide, the moving course of stroke eccentric transversely to its moving path such that, with respect to the amount, transverse displacements of the stroke eccentric which are approximately identical are achieved and thus also, by way of the piston stroke, of the piston connected with it.
This object is achieved by providing a piston engine having a hypocycloidal piston stroke transmission with a Watt's guide, particularly with pistons in opposed cylinders. A stroke eccentric is connected, with respect to the drive, with a push rod of a piston guided in a cylinder. A guide eccentric is guided orthogonally to the stroke eccentric path or piston path by means of the Watt's guide. The stroke eccentric and guide eccentric are arranged on the crank pin of a crankshaft. The guide eccentric is non-rotatably connected with the stroke eccentric and is rotatably disposed in a Watt's connecting rod controlled by way of control arms swivellably disposed on the motor housing. Parameters of the Watt's guide are selected such that a path course is forced upon the guide eccentric, which oscillates orthogonally with respect to the path of the stroke eccentric or piston, along each moving range close to its respective reversal point by means of the Watt's connecting rod which progressively deviates from the ideal orthogonal guide path such that, during each passage of the stroke eccentric through the intersection point of the guide path with the path of the stroke eccentric or piston path the guide eccentric has a maximal deviation .increment.q.sub.F from the ideal guide path.
By means of the invention, the transverse deviations of the stroke eccentric which is connected with the piston push rod with respect to the drive, which differ considerably particularly with respect to the amounts, are advantageously rendered uniform to an advantageously selectable extent of transverse deviation which significantly reduces the influence on a transverse displacement/slant of the piston in the respective cylinder. This is achieved by means of a course of the path of the connecting center point which deviates in a targeted manner and t
REFERENCES:
patent: 4779472 (1988-10-01), Brackett
patent: 5727513 (1998-03-01), Fischer
"Calculating Watt's Straight-Line Transmissions" vol. 1/1980, German Democratic Republic with German title "Maschinenbautechnik" ("Mechanical Engineering Technology").
Fischer Gert
Hoehl Johannes
Bayerische Motoren Werke Aktiengesellschaft
Huynh Hai
Kamen Noah P.
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