Hydraulic drive system for a vehicle

B - Operations – Transporting – 60 – K

Patent

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Details

B60K 17/356 (2006.01) B60K 17/10 (2006.01) F16H 61/44 (2006.01) B60K 6/12 (2006.01)

Patent

CA 2219284

This system provides a hydraulic drive system for a vehicle wherein the system will be user-friendly so as to not require any additional training for use and will represent a drive system that exceeds potential alternatives with respect to operation efficiency. A hydraulic drive system for a vehicle includes a pressurizing circuit and a working circuit that are interconnected by suitable valving. The pressurizing circuit incorporates a fixed displacement pump which is driven by a prime mover having a nominal horsepower rating. The prime mover is shifted between an idling speed when the pressure sensed within the pressurizing circuit is within a desired range and an optimum high RPM range when the pressure within the pressurizing circuit falls below the desired range. At least one accumulator is provided in the pressurizing circuit. The working circuit includes a plurality of motor units for driving the vehicle wheels and a plurality of motor control valves which can be placed in a de-activated position to isolate the associated motor unit from the flow of pressurized fluid and an activated position wherein the motor unit aids in driving the vehicle. The vehicle is shifted between various gear ranges by controlling the activation/deactivation of the motor control valves such that, as vehicle speed and drive resistance decreases, the number of motor units being used to propel the vehicle is reduced from a maximum number of four motor units to a single motor unit. A flow control valve is provided to alter the volume of fluid flowing to the various motor units based on desired speed/acceleration parameters as determined by the vehicle operator through a conventional accelerator pedal.

l'invention concerne un système d'entraînement hydraulique (2) pour un véhicule comportant un circuit de mise en pression (5, 5'') et un circuit de travail (7, 7', 7'', 7...). Une pompe (11), mue par un machine motrice (20) ayant une puissance nominale en cheval-vapeur, est incorporée au circuit de mise en pression. Cette machine motrice, qui est coupée ou bien tourne au ralenti lorsque la pression détectée dans le circuit de mise en pression se trouve à l'intérieur d'une plage souhaitée, fonctionne dans une plage optimale de régime élevé lorsque la pression tombe en dessous de la plage souhaitée. Le circuit de mise en pression, qui comporte également au moins un accumulateur (29), est pourvu de plusieurs moteurs (107, 108, 128, 129; 606-609; 651-654; 687a-692b), destinés à entraîner au moins une roue de véhicule, ainsi que d'un agencement de soupapes régulatrices (97, 133, 134; 621-624; 666-669; 710-716) qui isolent un ou plusieurs moteurs du débit de fluide sous pression lorsqu'elles sont désactivées et entraînent les moteurs lorsqu'elles sont activées. Au fur et à mesure que s'accroît la vitesse du véhicule et que décroît la résistance à l'entraînement, le nombre de moteurs propulsant le véhicule diminue progressivement. Une soupape régulatrice modifie le débit du fluide vers les moteurs.

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