Continuously variable hydrostatic transmission having...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 39/10 (2006.01)

Patent

CA 2189845

A hydrostatic transmission (10) includes wedge-shaped swashplate (54) operatively positioned between a hydraulic pump unit (28) driven by an input shaft (14) and a grounded hydraulic motor unit (40) to accomodate pumped exchanges of hydraulic fluid between the units (28, 40). The swashplate (54), drivingly coupled to an output shaft (16), is angularly adjustable about a pivot axis (57) oriented in intersecting, orthogonal relation to the output shaft axis (17) to infinitely variable transmission ratios. Pilot bearings (72, 75), mounted by the swashplate (54), support cylinder blocks (36, 48) of the hydraulic pump and motor units (28, 40) for nutating motions centered on the swashplate pivot axis (57) to minimize the resultant moment on the swashplate (54). Piston rods (32, 44) in the hydraulic pump and motor units (28, 40) are oriented in outwardly flared, acute angles to the output shaft axis (17) to expand the range of permissible angular adjustement of the swashplate (54) by a ratio controller (68).

Cette transmission hydrostatique (10) comprend un plateau oscillant cunéiforme (54), placé de manière fonctionnelle entre une unité pompe hydraulique (28) entraînée par un arbre d'entrée (14) et une unité moteur hydraulique (40) mis à la terre, afin de loger des échanges pompés de fluide hydraulique entre ces unités (28, 40). On peut régler de manière angulaire le plateau oscillant (54), lequel est couplé de manière menante à un arbre secondaire (16), autour d'un axe (57) de pivotement orienté perpendiculairement à l'axe (17) de l'arbre secondaire et entrecoupant cet axe, afin de permettre une infinité de rapports de transmission variable. Des roulements guides (72, 75), sur lesquels on a monté le plateau oscillant (54), supportent des blocs (36, 48) de culasse des unités (28, 40) pompe hydraulique et moteur, aux fins de déplacements oscillants centrés sur l'axe (57) pivotant du plateau oscillant, afin de minimiser le moment résultant sur ce plateau (54). Des tiges (32, 44) de piston des unités (28, 40) pompe hydraulique et moteur sont orientées pour former des angles aigus évasés vers l'extérieur avec l'axe (17) de l'arbre mené, afin d'accroître la gamme de réglages angulaires possibles du plateau oscillant (54) à l'aide d'un dispositif (68) de commande de rapports.

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