Internal-combustion engines – Transmission mechanism from piston – Crankshaft and connecting rod
Patent
1997-11-20
2000-01-11
McMahon, Marguerite
Internal-combustion engines
Transmission mechanism from piston
Crankshaft and connecting rod
F16H 2136, F01B 108
Patent
active
060124237
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hypocycloidal crank mechanism for piston engines.
For an internal-combustion engine with diametrically arranged cylinder pairs, such crank mechanisms was suggested in German Patent Application 195 04 890.3 in which, for the highest possible simplification of the hypocycloidal crank mechanism or of the lift engine, for two piston rods, which oscillate in the same direction in a plane and carry pistons on both ends, a single, orthogonally directed straight-line mechanism is provided between these piston rods. This straight-line mechanism comprises a single guiding eccentric arranged between piston-rod-side lifting eccentrics, which guiding eccentric interacts with a straight-line guiding element which is guided on the engine compartment side.
According to a first embodiment of the straight-line mechanism, a Watts-type control arm is provided as a guiding element which has a connecting rod which is constructed in one piece and, in whose bearing opening closed on the circumference, a guiding eccentric is arranged which is constructed of axial bisected sections. In another embodiment of the straight-line mechanism, a sliding block is provided as a guiding element which is bisected in the plane of the axis of the bearing opening and which interacts with a one-piece guiding eccentric connected in one piece with compensating masses. In the case of both embodiments, the multi-part combination, which in each case consists of three eccentrics, must be combined to a constructional unit by means of additional elements.
It is an object of the invention to improve the hypocycloidal crank mechanism of the above-mentioned type such that a built-up 3-eccentric combination is avoided and a respective straight-line guiding element can nevertheless be arranged with a circumferentially closed bearing opening on the guiding eccentric.
This object is achieved according to the present invention, specifically such that the three eccentrics form a one-piece component with at least one connection shoulder provided between a lifting eccentric and the adjacent guiding eccentric, which connection shoulder extends such in the crank pin direction that the guiding element with the circumferentially closed bearing opening guided over the shoulder-side lifting eccentric, can be displaced in the area of the connection shoulder transversely toward the guiding eccentric, for the rotationally movable positioning of the guiding element on the guiding eccentric.
The advantage of the invention is a one-piece 3-eccentric combination of a particularly high stability and operational reliability, paired with a straight-line guiding element which has a circumferentially closed opening and can be highly stressed, the pairing of the crank mechanism parts being distinguished by a simple mounting with a first straight-line movement over a lifting eccentric, a subsequent transverse movement in the area of the connection shoulder to the guiding eccentric and finally a further straight-line movement in the direction of the guiding eccentric, whereby the straight-line guiding element is threaded onto it. For further facilitating the mounting, the diameter of each lift eccentric is no more than equal; however, preferably smaller than the diameter of the guiding eccentric.
In the case of a single connection shoulder, which has a correspondingly long design, between a lift eccentric and the guiding eccentric, the invention permits the arrangement of straight-line guiding elements constructed in one piece, as, for example, the connecting rod of a Watts-type control arm, of a sliding block or of a roller bearing with an outer race used for the guiding.
For achieving a symmetrical loading of the crank mechanism, in an advantageous embodiment of the invention, the guiding eccentric is in a one-piece connection with each lifting eccentric by way of a connection shoulder, according to the invention, the guiding element consisting of parts which are dimensioned to be adapted to the courses of the connection shoulders and are divided transversel
REFERENCES:
patent: 3285503 (1966-11-01), Bancroft
patent: 3791227 (1974-02-01), Cherry
patent: 5727513 (1998-03-01), Fischer
Bayerische Motoren Werke Aktiengesellschaft
McMahon Marguerite
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