ENSEMBLE D'ENTRAINEMENT HYDRAULIQUE POUR ASSISTER DES FONCTIONS AUXILIAIRES DANS DES VEHICULES MOTORISES, ET PROCEDE POUR AJUSTER EN CONTINU LE REFOULEMENT D'UNE POMPE POUR UN DISPOSITIF AUXILIAIRE

摘要

A hydraulic drive assembly includes a variable displacement pump fluidly connected in a closed loop circuit with a motor for driving an ancillary device, such as a fan. An auxiliary pump can be operatively connected to the pump, the motor and a reservoir for replenishing fluid losses in the closed loop circuit. An auxiliary circuit connected to the pump has a recirculating passage fluidly connected to the closed loop circuit downstream of the motor to reduce the necessary reservoir volume. A method for smoothly and continuously adjusting the output of the pump to drive the ancillary device is also disclosed.