Hydraulic actuator arrangement
A hydraulic actuator arrangement ( 1 ) is described comprising a hydraulic actuator having a pressure chamber ( 2 ), a cylinder ( 3 ) in a cylinder housing ( 4 ), and a piston ( 5 ) connected to a piston rod, a hydraulic pump ( 7 ) connected to the pressure chamber ( 2 ) and an electric motor ( 8 ) driving the hydraulic pump ( 7 ), wherein the pump ( 7 ) and the motor ( 8 ) are arranged within the actuator. Such an actuator arrangement should have many application possibilities. To this end, a hydraulic pressure amplifier ( 10 ) is arranged between the hydraulic pump ( 7 ) and the pressure chamber ( 2 ).
1. A hydraulic actuator arrangement comprising a hydraulic actuator having a pressure chamber, a cylinder in a cylinder housing, and a piston connected to a piston rod, a hydraulic pump connected to the pressure chamber, and an electric motor driving the hydraulic pump, wherein the pump and the motor are arranged within the actuator, wherein a hydraulic pressure amplifier is arranged within the hydraulic actuator between the hydraulic pump and the pressure chamber, and wherein the hydraulic pressure amplifier is a pressure amplifier cartridge.
2. The actuator arrangement according to claim 1 , wherein the pressure amplifier is arranged in the piston rod.
3. The actuator arrangement according to claim 2 , wherein the motor and the pump are arranged in the piston rod.
4. The actuator arrangement according to claim 2 , wherein the pressure amplifier comprises switching means which in response to a pressure in the pressure chamber activate or inactivate the pressure amplifier.
5. The actuator arrangement according to claim 2 , wherein the motor is arranged in a section of the piston rod extending out of the cylinder in an extracted state of the piston rod.
6. The actuator arrangement according to claim 1 , wherein the motor and the pump are arranged in the piston rod.
7. The actuator arrangement according to claim 6 , wherein the pressure amplifier comprises switching means which in response to a pressure in the pressure chamber activate or inactivate the pressure amplifier.
8. The actuator arrangement according to claim 1 , wherein the pressure amplifier comprises switching means which in response to a pressure in the pressure chamber activate or inactivate the pressure amplifier.
9. The actuator arrangement according to claim 1 , wherein the motor is arranged in a section of the piston rod extending out of the cylinder in an extracted state of the piston rod.
10. The actuator arrangement according to claim 1 , wherein the motor is arranged in a section of the piston rod surrounded by an oil volume, when the piston rod is in a retracted position.
11. The actuator arrangement according to claim 10 , wherein the oil volume is unpressurized in the retracted position of the piston rod.
12. The actuator arrangement according to claim 1 , wherein an accumulator is arranged within the cylinder housing.
13. The actuator arrangement according to claim 12 , wherein the accumulator is arranged between the cylinder housing and the cylinder.
14. The actuator arrangement according to claim 12 , wherein the accumulator is ring-shaped.
15. The actuator arrangement according to claim 12 , wherein the accumulator extends over the length of the cylinder.
16. The actuator arrangement according to claim 1 , wherein the pressure chamber is arranged within the piston rod.
17. The actuator arrangement according to claim 16 , wherein a retraction chamber surrounds the piston rod, wherein a first pressure area of the retraction chamber is equal to a second pressure area of the pressure chamber.
18. The actuator arrangement according to claim 16 , wherein a buffer tank is provided.
19. The actuator arrangement according to claim 18 , wherein a volume of compressed air limits the buffer tank.
20. The actuator arrangement according to claim 1 , wherein the motor and pump travel with the piston rod.
21. The actuator arrangement according to claim 1 , wherein the hydraulic pressure amplifier comprises a control valve configured to connect a low-pressure cylinder of the hydraulic pressure amplifier to a supply line in a first position and to connect the low-pressure cylinder to a drain line in a second position.
22. A hydraulic actuator arrangement comprising a hydraulic actuator having a pressure chamber, a cylinder in a cylinder housing, and a piston connected to a piston rod, a hydraulic pump connected to the pressure chamber, and an electric motor driving the hydraulic pump, wherein the pump and the motor are arranged within the actuator, wherein a hydraulic pressure amplifier is arranged within the hydraulic actuator between the hydraulic pump and the pressure chamber, and wherein the motor is arranged in a section of the piston rod extending out of the cylinder in an extracted state of the piston rod.