Reciprocating fluid machines

F - Mech Eng,Light,Heat,Weapons – 01 – B

Patent

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F01B 9/04 (2006.01) F01B 1/08 (2006.01) F01B 9/02 (2006.01) F02B 75/22 (2006.01) F02B 75/24 (2006.01) F02B 75/32 (2006.01) F16H 21/36 (2006.01)

Patent

CA 2367987

A scotch yoke type fluid device in which the pistons (32) are decoupled from each other and provides each piston (32) with its own pair of sliding surfaces (30) and its own slider (18). The sliding surface (30) of each piston are disposed on the same side of the big end bearing (16) of the crank (12). The main axis (14) of the crank (12) is movable along a path such that the pistons are neither substantially retarded nor advanced. The effective centre of mass of the crank, piston and slider remains stationary relative to the crank axis. Each piston includes a guide means (2030) for constraining the piston to move along the piston axis, the guide means located transversely of the sliding surfaces (30) and engage guides rigidly mounted on the crankcase. An intermediate member may interconnect the piston and the slides with a means for adjusting the position of the intermediate member in order to change the compression ratio of the device. For a device having opposed pistons, the yoke (6060) attached to the two pistons is split into two parts (6062a, 6062b) releasably held together.

L'invention concerne un dispositif hydraulique (10) de type excentrique Scotch comportant des pistons (32) séparés l'un de l'autre. Chacun desdits pistons (32) est muni de sa propre paire de surfaces coulissantes (30) et de son propre élément coulissant (18). Les surfaces coulissantes (30) de chaque piston sont disposées du même côté que le coussinet de tête de bielle (16) de la manivelle (12). L'axe principal (14) de la manivelle (12) peut être déplacé le long d'une trajectoire de manière que les pistons ne soient ni trop en arrière, ni trop en avant. Le centre de gravité effectif de la manivelle, du piston et de l'élément coulissant reste fixe par rapport à la manivelle qui décrit un mouvement circulaire autour de son axe. Chaque piston comprend des moyens de guidage (2030) contraignant le piston à se déplacer le long de l'axe du piston. Lesdits moyens sont placés transversalement par rapport aux surfaces coulissantes (30) et s'engagent dans des moyens de guidage fixés rigidement au carter. Un élément intermédiaire peut servir à raccorder les pistons et les éléments coulissants : un moyen permettant de régler la position de cet élément intermédiaire de manière à modifier le rapport volumétrique de compression du dispositif. Pour un dispositif comportant des pistons opposés l'un de l'autre, l'excentrique (6060) relié au deux pistons est divisé en deux parties (6062a, 6062b) fixé l'un à l'autre de façon libérale.

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