초록 ▼

Cut-in-cut-out valves for hydraulic circuits. The hydraulic circuits include a hydraulic pump outputting a variable pressure controlled by a slaving line, an accumulation circuit, a return line to the reservoir, a cut in-cut-out valve. The hydraulic circuits also include a cut-in-cut-out valve havin

Cut-in-cut-out valves for hydraulic circuits. The hydraulic circuits include a hydraulic pump outputting a variable pressure controlled by a slaving line, an accumulation circuit, a return line to the reservoir, a cut in-cut-out valve. The hydraulic circuits also include a cut-in-cut-out valve having four orifices, a first orifice connected to the supply line, a second orifice connected to the slaving line, a third orifice connected to the return line leading to the reservoir, and a fourth orifice connected to the accumulation circuit. The cut-in-cut-out valve alternates between two positions as a function of the pressure in the accumulation circuit, a cut-in position in which the first, second and fourth orifices are connected to each other, and a cut-out position in which the first and fourth orifices are closed.

대표청구항 ▼

1. Hydraulic circuit comprising: a hydraulic pump outputting a variable pressure, said hydraulic pump supplying a supply line and being controlled by a slaving line,an accumulation circuit comprising at least one accumulator,a return line to the reservoir connected to an atmospheric pressure reservo

1. Hydraulic circuit comprising: a hydraulic pump outputting a variable pressure, said hydraulic pump supplying a supply line and being controlled by a slaving line,an accumulation circuit comprising at least one accumulator,a return line to the reservoir connected to an atmospheric pressure reservoir,a cut-in-cut-out valve,wherein the cut-in-cut-out valve comprises four orifices:a first orifice connected to the supply line,a second orifice connected to the slaving line,a third orifice connected to the return line leading to the reservoir,a fourth orifice connected to the accumulation circuit,said cut-in-cut-out valve having two positions:a cut-in position in which the first, second and fourth orifices are connected to each other, while the third orifice is closed,a cut-out position in which the first and fourth orifices are closed, while the second orifice is connected to the third orifice, so as to isolate the accumulation circuit from the supply line;said cut-in-cut-out valve being adapted to change from the cut-in position to the cut-out position when the pressure in the accumulation circuit reaches a threshold value. 2. Hydraulic circuit according to previous claim 1, also comprising a priority slide comprising three orifices: a priority slide first orifice connected to the pump through the supply line,a priority slide second orifice connected to an output line,a priority slide third orifice connected to a load line, itself connected to the first orifice of the cut-in-cut-out valve,the priority slide having two positions;a filling position in which the first priority slide orifice is connected only to the third priority slide orifice,a supply position, in which the first priority slide orifice is connected to both the second and third priority slide orifices,the output line being connected to at least one auxiliary device with an auxiliary load line connected to the slaving line. 3. Hydraulic circuit according to claim 1, also comprising a non-return valve placed on the accumulation circuit so that the hydraulic fluid can only circulate from the first orifice of the cut-in-cut-out valve to the accumulation circuit. 4. Hydraulic circuit according to claim 1, comprising a circuit breaking distributor (90), said circuit breaking distributor comprising three orifices: a circuit breaking distributor first orifice connected to the second orifice of the cut-in-cut-out valve,a circuit breaking second orifice connected to the slaving line,a circuit breaking distributor third orifice connected to the reservoir return line,said circuit breaking distributor being provided with two positions:a closed position in which the first circuit breaking distributor orifice is connected to the second circuit breaking distributor orifice, while the third circuit breaking distributor orifice is closed,an open position in which the second circuit breaking distributor orifice is connected to the third circuit breaking distributor orifice, while the first circuit breaking distributor orifice is closed. 5. Hydraulic circuit according to claim 1, in which the slaving line is connected to an auxiliary load line of an auxiliary device through a selector. 6. Hydraulic circuit according to claim 1, in which the accumulation circuit comprises at least one assembly comprising an accumulator associated with a brake valve with positive or negative braking. 7. Hydraulic circuit according to claim 1, comprising two assemblies comprising an accumulator associated with a brake valve with positive or negative braking, mounted in parallel and connected to the fourth orifice of the cut-in-cut-out valve through a selection valve.