Poclain Hydraulics Industrie

Andre Prigent

Jean Heren

Philippe Raymond Lucienne

Cyrille D'Hersignerie

Benjamin Basson

Julien Lambey

Benjamin Tenaud

The present invention concerns a hydraulic pressure amplifier device comprising a casing () having two chambers () of different cross-sections which house a staged piston () comprising two piston sections () with cross-sections respectively el matching the chambers (), and means () for controlling the movement of the piston (), characterised by the fact that the control means () are formed of an electronic control driven by means for estimating the ends-of-stroke of the piston () without an end-of-stroke sensor or mechanical stop.

Hydraulic pressure amplifier

An emergency braking device including an actuator (), a pressurizing circuit () supplying the actuator () via a control pressure and a discharge circuit (). The discharge circuit () includes restrictors () for controlling the pressure and/or flow rate of the supply fluid of the actuator () during a discharge of the actuator. The restrictors () are configured to define an intermediate pressure between a low pressure level and the control pressure of the actuator ().

Variable-torque emergency brake device

The present invention relates to a hydraulic-assistance system for motor vehicles, comprising a primary motor (M) and two hydraulic machines () connected by a hydraulic circuit such that when a first hydraulic machine () operates as a pump, the second hydraulic machine () operates as a motor. The invention is characterized in that the hydraulic circuit connecting the two machines () is an open circuit passing through a tank (), the hydraulic machine () operating as a motor is a declutchable machine, and the hydraulic machine () operating as a pump is a pump in which the variable displacement is controlled by a device comprising a proportional pressure limiter () placed between a drain line () and the discharge line of the hydraulic machine () operating as a pump, and enabling the assistance pressure to be set, and at least one collection nozzle () placed between the proportional pressure limiter () and the discharge line of the hydraulic machine (), the setpoint pressure controlling the hydraulic machine () operating as a pump being collected between the pressure limiter () and the collection nozzle ().

Hydraulic-assistance system for open-circuit motor vehicles

A hydraulic circuit. The circuit includes a high pressure line and a low pressure line, the pressure in the high pressure line being greater than the pressure in the low pressure line, a hydraulic machine having two ports designed to be connected to the high pressure and low pressure lines, a first of the ports being a hydraulic fluid intake port and the second of the ports being a hydraulic fluid discharge port The circuit includes a sequential connector designed to connect the ports of the hydraulic machine to the high and low pressure lines.

Desynchronized coupling of a hydraulic machine

Hydraulic transmission apparatus including a pressurized fluid source and at least one hydraulic motor fed by said pressurized fluid source. The motor has two motor ducts for feed/discharge, and one casing duct. The motor can be operated in assisted mode, in which it generates torque or in unassisted mode in which it does not generate any torque and its pistons are maintained in the retracted position under the effect of the pressure in the casing duct. The apparatus further includes an accumulator suitable for feeding: This apparatus thus enables the motor to be positively clutched/declutched quickly.

Hydraulic transmission apparatus making quick positive clutching/declutching possible

A hydraulic transmission system for a vehicle is provided. The system includes a main pump serving to feed with fluid at least one hydraulic motor for driving a vehicle mover member; an auxiliary pump, the main pump and the auxiliary pump being suitable for being actuated jointly; and a 'bypass' connection between a delivery orifice of the auxiliary pump and an unpressurized reservoir. In addition, a first constriction is arranged on the bypass connection, and configured to maintain a pump protection pressure in a pump protection portion of the bypass connection. This pressure is applied to the main orifices of the main pump when said pump is actuated but is not delivering, thereby ensuring that the pump is protected.

Hydraulic transmission system having a main pump that can be actuated continuously

A hydrostatic transmission including a main pump, two main ducts serving respectfully as feed and as discharge for first and second hydraulic motors that serve to drive disposed one after the other. A bypass valve can take up a reduced-speed position in which the feed main orifices are connected to the discharge main duct, and an increased-speed position in which one of the motors is bypassed, the feed main orifice of the motor being connected to the discharge main duct via a bypass link, while the other main orifices continue to have their respective links. The apparatus further includes a constriction suitable for being activated to restrict the flow of fluid through the bypass link.

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Verberie, France

Andre Prigent