Multi-range, hydromechanical transmission for off-road vehicles

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

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F16H 47/04 (2006.01)

Patent

CA 2254968

A hydromechanical transmission (2) receives split power inputs from a vehicle engine (6), one split input driving a hydrostatic power unit (4) and the other split input driving a mechanical power input (26). The infinitely variable hydrostatic power output (21) is combined in the mechanical power unit (8) with multiple ratios of its split input power to achieve multiple ratios of hydromechanical output power for smoothly propelling a vehicle form rest through multiple transmission ranges to maximum speed, with synchronous shifting between ranges. The hydromechanical transmission (2) is particularly applicable to off-road vehicles, such as agricultural tractors.

Cette transmission hydromécanique (2) reçoit des entrées de puissance divisées à partir d'un moteur (6) de véhicule, une entrée divisée entraînant un bloc moteur hydrostatique (4) et l'autre entrée divisée entraînant un bloc moteur mécanique (26). La sortie de puissance hydrostatique variant à l'infini (21) est combinée, dans le bloc-moteur mécanique (8), avec des rapports multiples de sa puissance d'entrée divisée pour produire des rapports multiples de la puissance de sortie hydromécanique pour faire passer de façon régulière un véhicule à partir d'une position de repos à travers plusieurs plages de transmission jusqu'à une vitesse maximale, un changement synchrone étant effectué entre les plages. Cette transmission hydromécanique (2) s'applique particulièrement à des véhicules tous terrains tels que des tracteurs agricoles.

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