Poclain Hydraulics

Poclain

Serge B Bacquie

Jean-Francois M Cheylus

Jean M Rouillard

The invention relates to a fluid mechanism supplied with pressurized fluid by means of a 'dis-engageable' valve-seat. Such mechanism further comprises a controlled and independent device for re-engaging the said valve-seat. The invention finds an application in the production of a hydraulic relief engine for use on a trailer pulled by a tractor.

Fluid mechanism with axially movable valve-seat

The invention relates to a drive-assisting device comprising at least a fluid relief engine, a source of pressurized fluid, an engine supply pipe connecting the delivery connector of the fluid source to the inlet connector of the engine, and a calibrated discharge valve, shunt-connected to the supply pipe and provided with means for adjusting its calibration, the control of which is deliberate. Another calibrated discharge valve, so-called check valve, is positioned on the release pipe and is provided with means for adjusting its calibration, the control of which is also deliberate, the calibration control means of the two valves being synchronized by way of a single manipulator with two separate ranges of operation separated by a neutral range, each one of the non-neutral ranges corresponding to substantially nil calibration pressures for one of the valves, and to non-nil calibration pressure for the other, and vice-versa, the neutral range corresponding to a substantially nil calibration pressure for each valve. An application of the invention is found to relieve the drive of a trailer pulled by a tractor.

Drive-assisting system comprising at least a fluid engine

This invention relates to an apparatus for feeding pressurized fluid by a constant c. c. pump and a variable c. c. pump, both driven by a single motor. A valve actuated by a centrifugal governor ensures the feed of a jack adjusting the position of the member for adjusting the cubic capacity of the variable c. c. pump. One application is the drive of pumps of which the sum of the maximum powers is greater than the maximum power of the motor.

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La Croix Saint Ouen, France

Serge B Bacquie