IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0831873
(2010-07-07)
|
등록번호 |
US-8276841
(2012-10-02)
|
우선권정보 |
DE-10 2009 032 077 (2009-07-07) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Ingrassia Fisher & Lorenz P.C.
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
A hydraulic actuator includes, but is not limited to a first outflow and a second inflow and outflow as well as a closure device for closing the second inflow and outflow in the direction of outflow. The first outflow an outflowing hydraulic fluid is subjected to flow resistance. When a switching po
A hydraulic actuator includes, but is not limited to a first outflow and a second inflow and outflow as well as a closure device for closing the second inflow and outflow in the direction of outflow. The first outflow an outflowing hydraulic fluid is subjected to flow resistance. When a switching position is reached, the second inflow and outflow is closed in the direction of outflow so that the hydraulic fluid has to be discharged through the first outflow while overcoming the flow resistance. This damps the movement of the hydraulic actuator in the region of an end position.
대표청구항
▼
1. A hydraulic actuator, comprising: a cylinder with a first inflow, a first outflow, a second inflow, and a second outflow for a hydraulic fluid;a closure device for closing the second inflow and second outflow in a direction of an outflow;a resistance device for generating flow resistance;a piston
1. A hydraulic actuator, comprising: a cylinder with a first inflow, a first outflow, a second inflow, and a second outflow for a hydraulic fluid;a closure device for closing the second inflow and second outflow in a direction of an outflow;a resistance device for generating flow resistance;a piston that is movably held in the cylinder;a piston rod connected to the piston and protruding from the cylinder;a first non-return valve connected to the first inflow for preventing the outflow of the hydraulic fluid through the first inflow; anda second non-return valve connected to the first outflow and connected in series with the resistance device for closing the first outflow when the hydraulic fluid is fed in through the first inflow;wherein the resistance device is designed to subject the hydraulic fluid flowing through the first outflow to flow resistance, andwherein the closure device is connected to the piston and is equipped, in a region between a switching position and an end position of the piston, to close the second inflow and outflow in the direction of outflow, and to open it between an initial position and a switching position. 2. The hydraulic actuator of claim 1, wherein the resistance device is a diaphragm with a predetermined flow resistance. 3. The hydraulic actuator of claim 1, wherein the resistance device is a throttle with an infinitely adjustable flow resistance. 4. The hydraulic actuator of claim 1, wherein the closure device is implemented by combining a second inflow aperture and an outflow entrance aperture with a cross-sectional profile of the piston rod,wherein the second inflow and the outflow entrance aperture corresponds to the second inflow and outflow, is arranged in the cylinder between the piston and a guide device of the piston rod, and comprises an aperture cross section for taking up outflowing of the hydraulic fluid,wherein the piston rod comprises a first section, which faces away from the piston, with a constant cross section that is smaller than the aperture cross section, and comprises a second section, which faces the piston, with a cross section that is approximately similar to the aperture cross section and comprises a shape that corresponds to that of the aperture so that the second inflow and the outflow entrance aperture and thus the second inflow and outflow closes in the direction of outflow when the second section enters the second inflow and outflow entrance aperture, wherein a position of the switching position is predetermined by a largest cross section of the second section. 5. The hydraulic actuator of claim 4, wherein the cross section of the first section of the piston rod gradually approximates the cross section of the second section of the piston rod so that a damping effect occurs gradually. 6. The hydraulic actuator of claim 4, wherein the piston rod furthermore comprises a third section that is arranged between the second section of the piston rod and the piston and that comprises a constant cross section that is similar to the cross section of the second inflow and outflow entrance aperture. 7. The hydraulic actuator of claim 1, wherein the hydraulic actuator is adapted to move an object on a vehicle. 8. An aircraft, comprising: at least one space;a flap adapted to close the at least one space;a hydraulic actuator that moves said flap;a cylinder with a first inflow, a first outflow, a second inflow, and a second outflow for a hydraulic fluid;a closure device for closing the second inflow and outflow in a direction of outflow;a resistance device for generating flow resistance;a piston that is movably held in the cylinder;a piston rod that protrudes from the cylinder and the piston rod is connected to the piston;a first non-return valve connected to the first inflow for preventing the outflow of the hydraulic fluid through the first inflow; anda second non-return valve connected to the first outflow and connected in series with the resistance device for closing the first outflow when the hydraulic fluid is fed in through the first inflow;wherein the resistance device is designed to subject the hydraulic fluid flowing through the first outflow to flow resistance, andwherein the closure device is connected to the piston and is equipped, in a region between a switching position and an end position of the piston, to close the second inflow and outflow in the direction of outflow, and to open it between an initial position and a switching position. 9. The aircraft of claim 8, wherein the resistance device is a diaphragm with a predetermined flow resistance. 10. The aircraft of claim 8, wherein the resistance device is a throttle with an infinitely adjustable flow resistance. 11. The aircraft of claim 8, wherein the closure device is implemented by combining a second inflow aperture and outflow entrance aperture with a cross-sectional profile of the piston rod,wherein the second inflow and outflow entrance aperture corresponds to the second inflow and outflow, is arranged in the cylinder between the piston and a guide device of the piston rod, and comprises an aperture cross section for taking up outflowing of the hydraulic fluid,wherein the piston rod comprises a first section, which faces away from the piston, with a constant cross section that is smaller than the aperture cross section, and comprises a second section, which faces the piston, with a cross section that is approximately similar to the aperture cross section and comprises a shape that corresponds to that of the aperture so that the second inflow- and outflow entrance aperture and thus the second inflow and outflow closes in the direction of outflow when the second section enters the second inflow- and outflow entrance aperture, wherein a position of the switching position is predetermined by a largest cross section of the second section. 12. The aircraft of claim 11, wherein the cross section of the first section of the piston rod gradually approximates the cross section of the second section of the piston rod so that a damping effect occurs gradually. 13. The aircraft of claim 11, wherein the piston rod furthermore comprises a third section that is arranged between the second section of the piston rod and the piston and that comprises a constant cross section that is similar to the cross section of the second inflow and outflow entrance aperture. 14. The aircraft of claim 8, wherein the hydraulic actuator is adapted to move an object on a vehicle.
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