Internal-combustion engines – Multiple cylinder – Cylinders radiating
Patent
1997-10-22
1999-08-31
Yuen, Henry C.
Internal-combustion engines
Multiple cylinder
Cylinders radiating
1231974, F01B 902, F02B 7524
Patent
active
059439874
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a reciprocating piston engine having cylinders adjacent in the crankshaft direction in an engine case, particularly an internal-combustion engine, comprising a reciprocating drive system for reciprocating pistons which, by way of piston rods by means of a hypocycloidal straight-line mechanism, are in a driving connection with reciprocating and guide eccentrics which are rotationally movable on a crankshaft, a guide element of the straight-line mechanism cooperating with guide surfaces arranged on the engine case.
GB-1 060 372 describes an embodiment of a reciprocating piston engine having diametrically arranged cylinder pairs whose parallel axes orthogonally intersect the axis of rotation of the crankshaft. This reciprocating piston engine is an internal-combustion engine combined with a reciprocating piston compressor. This known engine comprises a reciprocating drive system with a hypocycloidal straight-line mechanism which comprises eccentrics combined with a crankshaft and non-rotatably connected with one another. Both piston rods, which connect opposing pistons in diametrical cylinders, are jointly in a driving connection with a tube-type reciprocating eccentric constructed of two parts, in whose two end areas one guide eccentric respectively is arranged which has a guide element guided on the engine case side in a straight line in a slidably movable manner.
Cylinder tubes, which in addition are used for the linear guiding of the reciprocating pistons and are arranged to be guided coaxially to the reciprocating pistons in the engine case and, for the slidably movable guiding are in a driving connection with the tube-type reciprocating eccentric are particularly disadvantageous with respect to this known reciprocating drive system. This arrangement results in a reciprocating piston engine which has a long dimension in the longitudinal direction of the crankshaft and disadvantageously large bearing distances for the crankshaft in the engine case.
Another disadvantage is the high-expenditure and complicated construction of this known reciprocating drive system with the hypocycloidal straight-line mechanism with a three-disk eccentric mounted freely rotatably on a crankshaft reciprocating pin and integrally formed.
DE-PS 271 755 describes an embodiment of an internal-combustion engine with a reciprocating piston with diametrically arranged cylinder pairs whose parallel axes extend in a transverse plane with respect to the axis of rotation of the crankshaft. In the case of a reciprocating drive system with a hypocycloidal straight-line mechanism, this arrangement permits the linking of the parallel piston rods to a single guide ring of a reciprocating eccentric non-rotatably arranged in the center between pinions of Cardan's circle pairs.
Although this known arrangement with the hypocycloidal straight-line mechanism results in a reciprocating piston engine which has a short construction in the longitudinal direction of the crankshaft and has relatively short bearing distances of the crankshaft, the low stability of this reciprocating drive system with its toothing is a disadvantage.
Further, DE-A 25 19 908 describes a hypocycloid reciprocating piston engine which, in the plane of the axis of rotation of the crankshaft, has cylinder pairs arranged in an adjacent manner in the direction of the crankshaft, between whose connecting rods another orthogonally directed cylinder pair is provided as the hypocycloidal straight-line mechanism. This cylinder pair has pistons oscillating in additional cylinders of the reciprocating piston engine which are used as guide elements so that this crosswise arrangement of cylinder pairs results in a disadvantageously large-sized internal-combustion engine.
In another embodiment of the species shown in DE-A 25 19 908, instead of guidance by a cylinder pair, a sliding block cooperates with the guide eccentric provided centrally between the piston rods. The block is guided linearly by straight-line mechani
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Bayerische Motoren Werke Aktiengesellschaft
Castro Arnold
Yuen Henry C.
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