Poclain Hydraulics Industrie

Loic Bonnard

Dominique Costaz

Julien Viard

Julien Engrand

Gilles Grillon

Sébastien Gonzalez

Philippe Telega

Sebastien Gonzalez

A hydraulic machine including an improved sweep circuit, adapted to form a primary sweep stream circulating from an inlet orifice successfully in a proximal portion, in a middle portion and in a distal portion of the hydraulic machine, then in the middle portion and in the proximal portion up to an outlet orifice.

Flushing circuit for a hydraulic machine

A braking device may include a brake casing rotatably assembled with respect to a shaft along an axis of rotation, first braking elements and second braking elements, forming a stack, an elastic return element configured to exert an application force on the first and second braking elements, and a brake release actuator, adapted to bias the elastic return element along a direction opposing the application direction. The braking device a may include a diffusion wedge and a pressure wedge positioned respectively to bear against the stack and against the elastic return element. The diffusion wedge and the pressure wedge may have contact surfaces defining an annular linear contact about the axis of rotation.

Braking device

The machine comprises distribution ducts connected to respective ones of first, second, and third enclosures (), and a cylinder-capacity selector () suitable for being caused to take up a large cylinder capacity configuration in which the second enclosure () is connected to one of the main ducts (), while the first and third enclosures () are connected to the other main duct (), and a small cylinder capacity configuration in which the second and third enclosures () are connected to said one of the main ducts (), while the first enclosure is connected to the other main duct (). The machine further comprises a safety valve () having at least a first port () connected to said one of the main ducts (), and a second port () connected to the third enclosure (). Said safety valve is suitable, when the cylinder-capacity selector () is caused to go into the large cylinder capacity, for being caused to go into a first configuration that isolates the first and second ports () from each other, and, when the cylinder-capacity selector is caused to go into its small cylinder capacity, for being caused to go into a second configuration that interconnects the first and second ports ().

Hydraulic machine having two cylinder capacities and a safety valve

The devices comprises a distributor () that presents distribution ducts opening out into a radial distribution face (A), and a distributor-counterpart engaged in each other in such a manner that two main enclosures () are provided between their opposite axially-extending faces. The device comprises a cylinder-capacity selector comprising two slides () arranged after the other in a bore () of the element engaged in the other, to which are connected the main enclosures () and at least some of the distribution ducts (). The slides are able to adopt at least three distinct configurations establishing different connections between the main ducts () and the distribution ducts via the main enclosures, in order to be able to obtain at least three distinct operating cylinder capacities.

Distribution device for a hydraulic machine and a hydraulic machine fitted with such a device

A selection system, comprising: a sheath defining an internal housing extending in a longitudinal direction; a link rod disposed in said internal housing, and extending in the longitudinal direction; and a selection slide mounted to slide in the internal housing, about the link rod; the link rod being held stationary relative to the sheath against movement in translation in the longitudinal direction by stop means; the system being characterized in that the stop means comprise: a base that is a body of revolution and includes a conical portion; and a shell comprising two shell portions each including a conical portion configured to come to bear in plane manner against the conical portion of the base.

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Verberie, France

Loic Bonnard