Hydraulic pressure amplifier arrangement
A hydraulic pressure amplifier arrangement ( 1 ) is described comprising a supply port (A 1 ), a pressure outlet (A 2 ) connected to the supply port via check valve means ( 3 ), an intensifier section ( 5 ) having a high pressure piston ( 6 ) in a high pressure cylinder ( 7 ), a low pressure piston ( 8 ) in a low pressure cylinder ( 9 ) and connected to the high pressure piston ( 6 ), and a control valve ( 12 ) controlling a pressure in the low pressure cylinder ( 9 ), wherein the control valve ( 12 ) comprises a hydraulically actuated valve element ( 13 ). Such a pressure amplifier arrangement should have a good operational behavior in a cost effective manner. To this end the control valve ( 12 ) comprises spring means 16 acting on the valve element ( 1 ) in a direction towards a starting position of the control valve.
1. A hydraulic pressure amplifier arrangement comprising a supply port, a pressure outlet connected to the supply port via check valve means, an intensifier section having a high pressure piston in a high pressure cylinder, a low pressure piston in a low pressure cylinder and connected to the high pressure piston, and a control valve controlling a pressure in the low pressure cylinder, wherein the control valve comprises a hydraulically actuated valve element,
wherein the control valve comprises spring means acting on the valve element in a direction towards a starting position of the control valve,
wherein the starting position is a position in which the lower pressure cylinder and an intermediate space between the high pressure piston and the lower pressure piston are connected to a return port or a tank port, wherein the valve element comprises a pilot pressure area and an inlet pressure area,
wherein a pressure on the inlet pressure area acts in the same direction as a force of the spring means, and a pressure on the pilot pressure area acts in the opposite direction,
wherein the pilot pressure area is larger than the inlet pressure area,
wherein the pressure on the pilot pressure area is the same as the pressure on the inlet pressure area, and
wherein the pressure on the pilot pressure area is the same as the pressure on the inlet pressure area when the intermediate space and the low pressure cylinder are connected to the pilot pressure area and the inlet pressure area, and when the high pressure cylinder is connected to the pilot pressure area and the inlet pressure area.
2. The arrangement according to claim 1 , wherein the inlet pressure area is arranged in an inlet pressure chamber and the spring means are arranged in the inlet pressure chamber.
3. The arrangement according to claim 1 , wherein the spring means generate a preload force which is equal to a difference between the pilot pressure area and the inlet pressure area multiplied with an inlet pressure.
4. The arrangement according to claim 2 , wherein the spring means generate a preload force which is equal to a difference between the pilot pressure area and the inlet pressure area multiplied with an inlet pressure.