Patent ID: 7406824
Filing Date: 2008-08-05
Classification: B60K,F16H

Abstract:
1. A hydrostatic transmission circuit for a vehicle having at least one first displacement member and at least one second displacement member disposed one after the other in the direction of travel of said vehicle, the circuit comprising at least one main hydraulic pump, two main ducts which are respectively a feed main duct and a discharge main duct, and a first hydraulic motor and a second hydraulic motor for driving respective ones of said first and of said second displacement members, at least the first hydraulic motor being a dual motor made up of two elementary motors, each elementary motor having a feed or discharge first elementary connection and a discharge or feed second elementary connection, the first elementary connections being united to form a common first main connection for the first hydraulic motor, while the second elementary connections are mutually separate and form respective ones of the second and third main connections of the first hydraulic motor, the first main connection of the first hydraulic motor being connected to the first main duct while the second main connection of said first motor is connected to a first feed or discharge additional duct; and the third main connection of said first motor is connected to the second main duct, the second hydraulic motor having a first main connection which is connected to the second main duct and a second main connection which is connected to a second feed or discharge additional duct the circuit further comprising booster means for boosting the feed or discharge ducts and at least one replenishing valve suitable for being connected to one of the main ducts and suitable for taking up an open configuration in which it enables a replenishing link to be established between the main duct to which it is connected and a pressure-free reservoir, and a closed configuration in which it prevents said link from being established, said circuit further comprising means for preventing the replenishing link from being established on detecting a condition that reveals a spin situation.