Poclain Hydraulics Industrie

Luka Peternel

Ante Bozic

Matej Erznoznik

Franc Majdic

Anze Celik

Alen Ljoki

The invention relates to a pressure-limiting device designed to be installed in a system comprising a first line () and a second line () that can comprise pressurised oil, as well as comprising a discharge and/or booster line (). The limiting device is characterised in that it comprises means () forming two valves, each associated with one of the two lines and adapted to open in the event of an overpressure above a pre-determined threshold on the associated line, so as to discharge the corresponding overpressure towards the discharge and/or booster line, said two valves comprising a common support stem () that operates in traction under the action of at least one spring defining a pressure corresponding to the pre-determined threshold. The invention also relates to a hydraulic assist system and to a vehicle comprising such a device.

Pressure limiting device, in particular for a hydraulic assist system for vehicles

The invention relates to a flow control valve adapted for use as a flow-dividing and flow-combining valve in hydraulic devices, comprising: a valve body having a first longitudinally extending bore, an outer spool slidably positioned within the bore, the outer spool having an axially extending passageway, a pair of axially extending inner spools slidably positioned within the passageway, the valve body having a first port and a pair of second ports, the outer spool having at least a first opening communicating with the first port and with the passageway, and at least two pairs of second openings therethrough. At least one second opening of each pair is of non-constant longitudinal section narrowing from the outer face of the outer spool on at least a part of the thickness of the second opening, so that a lateral side of the second opening offers an obstacle where a part of the fluid flow entering the second opening crashes before entering the inner spool.

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Verberie, France

Luka Peternel