Poclain Hydraulics Industrie

André Prigent

Jean Heren

Julien Lambey

Philippe Raymond Lucienne

Jean-Philippe Raisin

Cyrille D'Hersignerie

Pierre-Louis Houillon

Marko Zust

Romain Gostomski

Benjamin Basson

Bertrand Lemaitre

Antoine Desmyttere

Terence Herbert Collins

Philippe Lucienne

Benjamin Tenaud

Lilian Charlier

Alexandra Bertaux

A method for driving a braking circuit for a vehicle equipped with a coupling is disclosed. The vehicle includes a hydraulic supply circuit and a hydraulic control circuit equipped with a driving device. The coupling includes a hydraulic braking circuit linked to the hydraulic supply circuit and to the hydraulic control circuit and includes a hydraulic accumulator.

Method and system of hydraulic braking for vehicle with coupling

A method for driving a parking brake of a vehicle (V) wherein:

Emergency hydraulic braking method and circuit for coupling

A driver circuit for driving a brake having a first orifice adapted to be connected to a pressure source, a second orifice connected to a reservoir, a third orifice receiving a braking setpoint, and a fourth orifice connected to a brake. The driver circuit includes a proportional solenoid valve connected to the first orifice; an on/off solenoid valve connected to the third orifice; and a proportional braking valve provided with an actuator and configured in such a manner as to connect a brake selectively to a pressure source or to a reservoir. The actuator is configured in such a manner as to be driven by the higher of the two pressures delivered by the proportional solenoid valve and delivered by the on/off solenoid valve.

Hydraulic brake circuit

Hydraulic transmission apparatus () including a pump () having a variable cylinder capacity and feeding one or more hydraulic motors (A,B), and a control unit (). In the apparatus, the feed and discharge orifices of the motors are arranged in such a manner that, when the pressures at said orifices are equal, the outlet torque from the motors is zero. To make the apparatus inactive, without physically bypassing the motors, the control unit is suitable for operating the apparatus in a 'torque-free' mode by regulating the cylinder capacity of the pump in such a manner that the pressures at said feed and discharge orifices remain substantially equal.

Hydraulic transmission device

A hydraulic transmission apparatus having at least one declutchable hydraulic motor having radial pistons and connected via two motor ducts, and a casing duct connected to the inside of the casing. The apparatus further has clutching means that, in order to perform the clutching of the motor, are suitable for bringing a first one of the motor ducts to a 'clutching' first pressure that is higher than the pressure in the casing while also making it possible to remove fluid via the casing duct. Disposed on the casing duct, the apparatus further has means for limiting the flow of fluid in said casing duct, in a manner such as to cause the pressure inside the casing to increase during the clutching operation. This apparatus enables clutching to take place gently.

Hydraulic transmission device allowing relatively quiet coupling

The present disclosure is directed to a hydrostatic transmission apparatus including a pump, a first motor, and a second motor having two elementary motors. Each of the motors having first and second enclosures for feed/discharge. In work mode and in road mode, the second enclosure of the first elementary motor of the second motor and the first enclosure of the first motor are connected together in series, the second enclosure of the first motor being connected to the second port of the pump, and the second enclosure of the second elementary motor of the second motor is connected to the second port of the pump. In work mode, the first enclosure of each of the two elementary motors of the third motor is connected to the first port of the pump.

Hydrostatic transmission device ensuring good driveability

Hydrostatic transmission apparatus for a vehicle having a front group of drive members and a rear group of drive members, a pump, a front motor and a rear motor contributing to driving respective ones of the front and rear groups of drive members; a first one of the motors and a second one of the motors connected to the first motor via a series duct also being connected to the main orifices of the pump, thereby constituting a closed transmission circuit; at least one pressure-limiting valve being interposed between the series duct and a low-pressure circuit, and being suitable for connecting the series duct to the low-pressure circuit while being controlled as a function of the high pressure of the pump. The pressure in the series duct is thus effectively limited to a pressure representative of the pressure necessary for driving the vehicle.

Hydrostatic transmission device for a mobile machine

A hydraulic circuit having a brake pipe suitable for being connected to a pressurized fluid source or to a pressure-free reservoir, i.e. to a reservoir without excess pressure, via a proportional pressure reducer controlled by an electronic control unit (ECU). The circuit includes link solenoid-valve means suitable for connecting the proportional pressure reducer to the reservoir or, via a calibrated pressure reducer, to the pressurized fluid source.

Device for controlling hydraulic braking of a trailer hitched to a tractor

The circuit comprises a main hydraulic pump (), two main ducts (), a booster pump (), a hydraulic motor () which comprises two elementary motors () for driving a first displacement member (), and a second hydraulic motor () for driving a second displacement member (). The second elementary motor () is in parallel with the second main motor () while the first elementary motor () and the second main motor () are connected to a feed or discharge additional duct, e.g. via a series link between them. The booster pump () is connected to the additional duct, e.g. an interconnection duct () for interconnecting the first elementary motor () and the second main motor (). A replenishing valve () is suitable for connecting one of the main ducts to a pressure-free reservoir () and the circuit further comprises means () for preventing said replenishing link from being established on detecting a condition that reveals a spin situation.

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Saintines, France

André Prigent