Hydraulic variable speed drive

Details Hydraulic variable speed drive Hydraulic variable speed drive

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 39/32 (2006.01) F04C 11/00 (2006.01)

Patent

CA 2180576

It comprises an integral block of a variator assembly which includes a hydropump cylinder (29), a hydromotor cylinder (39) the end-plates (30, 55) and a intermediary plate (38, 43) with ports for the fluid from the hydropump to the hydromotor at high pressure and from the hydromotor to the hydropump at low pressure to close the circuit. The shafts of the rotors (40, 50) of the hydropump and of the hydromotor have a common geometrical axis (22) which is static with respect to the outside and on which they may rotate independently, said rotation motion being the only motion possible. The variator assembly has as unique possible motion the rotation with respect to a geometrical axis (23) which is fixed with respect to the outside and different from the geometrical axis (65) of the cylinder (29) of the hydropump, different also from the geometrical axis (66) of the cylinder of the hydromotor (39) and different from the common geometrical axes (22) of the rotors. A rotation of the variator assembly is caused from the outside and causes the geometrical axes of the cylinder (29) of the hydropump and of the cylinder (39) of the hydromotor to come closer to or move away from the geometrical axes of their respective rotors (40, 50), thereby causing the variation in the ratio between the rotation speeds of the hydropump rotor (40) and the hydromotor rotor (50).

Il comprend un bloc solidaire d'un ensemble variateur qui englobe un cylindre (29) d'une hydropompe, un cylindre (39) d'un hydromoteur, ses plaques extrêmes (30, 55) et une plaque intermédiaire (38, 43) avec des lumières ou passages du fluide depuis l'hydropompe à l'hydromoteur en haute pression et de l'hydromoteur à l'hydropompe en basse pression pour fermer le circuit. Les arbres des rotors (40, 50) de l'hydropompe et de l'hydromoteur ont un axe géométrique commun (22) qui est statique par rapport à l'extérieur et sur lequel ils peuvent tourner indépendamment, ce mouvement de rotation étant le seul mouvement possible. L'ensemble variateur a également comme seul mouvement possible la rotation par rapport à un axe géométrique (23) fixe par rapport à l'extérieur et distinct de l'axe géométrique (65) du cylindre (29) de l'hydropompe, distinct de l'axe géométrique (66) du cylindre de l'hydromoteur (39) et également distinct de l'axe géométrique commun (22) des rotors. La rotation de l'ensemble variateur est provoquée depuis l'extérieur et fait que les axes géométriques du cylindre (29) de l'hydropompe et du cylindre (39) de l'hydromoteur se rapprochent ou s'éloignent des axes de leurs rotors respectifs (40, 50), provoquant ainsi la variation du rapport entre les vitesses de rotation du rotor (40) de l'hydropompe et du rotor (50) de l'hydromoteur.

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