EP3460260A1 - Linearer hydraulikaktuator - Google Patents

Linearer hydraulikaktuator Download PDF

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Publication number
EP3460260A1
EP3460260A1 EP17799570.1A EP17799570A EP3460260A1 EP 3460260 A1 EP3460260 A1 EP 3460260A1 EP 17799570 A EP17799570 A EP 17799570A EP 3460260 A1 EP3460260 A1 EP 3460260A1
Authority
EP
European Patent Office
Prior art keywords
flow path
cavity
connection pin
hydraulic actuator
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17799570.1A
Other languages
English (en)
French (fr)
Other versions
EP3460260A4 (de
Inventor
Sung Moo Ryu
Jeong Whan Moon
Chae Hyeuk LEE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knr Systems Inc
Original Assignee
Knr Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Knr Systems Inc filed Critical Knr Systems Inc
Publication of EP3460260A1 publication Critical patent/EP3460260A1/de
Publication of EP3460260A4 publication Critical patent/EP3460260A4/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/04—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member with oscillating cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members

Definitions

  • the present invention relates to a linear hydraulic actuator, and more particularly, to a linear hydraulic actuator that supplies a hydraulic pressure using a flow path formed within a structure thereof.
  • a hydraulic actuator is an element that receives a hydraulic pressure to finally perform a movement among elements of a hydraulic pressure apparatus.
  • a linear actuator includes a housing and a piston provided within the housing, and when a hydraulic pressure is applied to a bi-direction of the piston, the piston may perform a linear reciprocating motion.
  • a hydraulic pressure is supplied to a chamber within the housing in a state pressed by a hydraulic pressure pump, and in order to transfer a fluid, a tube is used from the pump to the actuator.
  • a linear actuator having a hydraulic pressure tube is disclosed.
  • the present invention has been made in an effort to provide a linear hydraulic actuator for transferring a hydraulic pressure without a hose in order to solve a problem of a conventional linear hydraulic actuator.
  • a hydraulic actuator includes a housing having an internal space that may receive a fluid; a piston that receives a pressure from the fluid received at the internal space to perform a reciprocating motion in a length direction; a piston load that penetrates the housing to be connected to the piston; and an internal flow path that receives a fluid from a hinge portion connected to the outside at an external end portion of the housing or the piston load.
  • the hinge portion may be connected to a connection pin inserted in a orthogonal direction to a length direction of the actuator, and the internal flow path may be connected to a connection pin flow path formed in the connection pin in order to receive a fluid through the connection pin.
  • connection flow path may be formed in a rotation direction in a connection portion of the connection pin flow path and the internal flow path in order to connect a flow path when the connection pin rotates.
  • connection flow path may be formed between an inner surface of the hinge portion and an outer surface of the connection pin.
  • the connection flow path may include a first cavity and a second cavity formed in a ring shape at an inner surface of the hinge portion.
  • the first cavity and the second cavity each may be separated at a predetermined distance in order to form an independent fluid path, and the hydraulic actuator may further include a first sealing member for preventing a fluid from being leaked between the first cavity and the second cavity.
  • the hydraulic actuator may further include second sealing members provided at the outside of a length direction of each of the first cavity and the second cavity in order prevent the fluid from being leaked in a length direction of the connection pin from the first cavity or the second cavity when the connection pin is fastened.
  • the internal space may be divided into a first chamber and a second chamber by the piston, and the internal flow path may include a first internal flow path and a second internal flow path formed in a length direction from the hinge portion in order to supply the fluid to each of the first chamber and the second chamber.
  • One side of the first internal flow path may be connected to the first cavity and be formed in a length direction within the housing, and the other side thereof may be connected to the first chamber, and one side of the second flow path may be connected to the second chamber and be formed in a length direction within the housing, and the other side thereof may be connected to the second chamber.
  • the hydraulic actuator may further include a wear ring provided at a periphery of the first cavity and the second cavity between the connection pin and the hinge portion in order to support a load of a length direction operating to the actuator.
  • a hydraulic actuator in accordance with another exemplary embodiment, includes a housing having an internal space that may receive a fluid; a piston that receives a pressure from the fluid received at the internal space to perform a reciprocating motion in a length direction; a hinge portion configured at an external end portion of the housing; a connection pin inserted into the hinge portion to be rotated; and a flow path formed through the connection pin, the hinge portion, and the housing such that the fluid is supplied to the internal space or is returned from the internal space.
  • the internal space may be divided into a first chamber and a second chamber by the piston, and the flow path may include: a first flow path that fluidically communicates with the first chamber and the outside; and a second flow path that fluidically communicates with the second chamber and the outside.
  • the first flow path and the second flow path may include a first cavity and a second cavity, respectively, configured with an inner surface of the hinge portion and an outer surface of the connection pin in order to fluidically communicate even when the connection pin rotates within the hinge portion.
  • the first cavity and the second cavity are formed in a ring shape between an inner surface of the hinge portion and an outer surface of the connection pin.
  • the hydraulic actuator may further include second sealing members spaced from the first cavity and the second cavity in an axial direction of the connection pin in order to prevent the fluid from being leaked to the outside when the connection pin rotates.
  • a linear hydraulic actuator may transfer a hydraulic pressure to a hinge portion or a joint using an actuator structure without a hose, an influence of elasticity of the hose may be ignored and thus control rigidity is enhanced and a precise and robust control performance can be thus secured, and upon designing, a hose may be ignored and thus the degree of freedom of a design can be enhanced.
  • a linear hydraulic actuator according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.
  • a name of each constituent element may be referred to as a different name in the art.
  • the constituent elements may be regarded as equivalent elements.
  • a reference numeral is added to each constituent element.
  • contents shown on a drawing having these reference numerals do not limit a range of each constituent element to a range within the drawing.
  • constituent elements may be regarded as equivalent elements.
  • constituent element is recognized as a constituent element that should be naturally included in a level of a person of ordinary skill in the art, a detailed description thereof will be omitted.
  • FIG. 1 is a perspective view illustrating a linear hydraulic actuator according to a first exemplary embodiment.
  • the linear hydraulic actuator may include a housing 100, a piston 310, a piston load 320, a hinge portion 200, a connection pin 400, and a flow path.
  • a location of the piston 310 is changed according to a supply direction of a hydraulic pressure, and the piston load 320 may finally linearly move.
  • the hinge portion 200 is provided at each of both ends of the linear hydraulic actuator, i.e., an end portion of the housing 100 and an end portion of the piston load 320, and the linear hydraulic actuator is connected to an external structure or a link to transfer power to the outside.
  • the housing 100 forms an entire external form of the actuator and is configured in a long pillar shape in an operation direction of the actuator.
  • a cylinder-shaped chamber is provided such that the piston 310 performs a linear reciprocating motion.
  • a first chamber 510 and a second chamber 520 may be divided by the piston 310.
  • the hinge portion 200 for connecting with the outside at one side may be provided.
  • the piston 310 is configured to receive a pressure from a fluid within the chamber to generate a force.
  • the piston 310 may have a cross-section of a cylinder shape, and in order to prevent a fluid from being leaked between each chamber within the housing 100 and to reduce a friction upon moving, a seal complex may be provided at an edge of a circumferential direction of the piston 310.
  • the piston load 320 is provided to operate a force generated in the piston 310 to the outside.
  • One side of the piston load 320 is connected to the piston 310 and is installed to penetrate the housing 100 in a length direction, and the hinge portion 200 may be provided such that the other side of the piston load 320 is connected to an external structure.
  • a seal kit may be provided not to leak a fluid within the chamber.
  • a general configuration of the housing 100 and the piston 310 is a widely used configuration and therefore a detailed description thereof may be omitted.
  • connection pin 400 is inserted into the hinge portion 200 provided in the housing 100 to be connected to an external structure, and is inserted into the hinge portion 200 in a pin form and is configured to rotate in a connection portion when an entire length is changed according to an operation of the actuator to perform a smooth mechanical movement.
  • a connection pin flow path 630, 730 may be provided within the connection pin 400 and this will be described in detail later.
  • a flow path that supplies a hydraulic pressure is formed within the housing 100. Such an internal flow path will be described in detail hereinafter.
  • FIG. 2 is a diagram illustrating an internal flow path of FIG. 1
  • FIG. 3 is a cross-sectional view illustrating the linear hydraulic actuator taken along line A-A' and B-B' of FIG. 1 .
  • the internal flow path may include a first flow path 600 that forms a path for fluidical communication of the first chamber 510 and the outside and a second flow path 700 that forms a path for fluidical communication of the second chamber 520 and the outside.
  • the first flow path 600 and the second flow path 700 each form a independent path of a fluid, and a hydraulic pressure may be selectively transferred by a valve provided at the outside of the actuator.
  • the first flow path 600 may include a first internal flow path 610, a first cavity 620, and a first connection pin flow path 630
  • the second flow path 700 may include a second internal flow path 710, a second cavity 720, and a second connection pin flow path 730 to correspond thereto.
  • a flow of a fluid entered from the outside may be performed in order of a connection pin flow path, a cavity, an internal flow path, and a chamber.
  • a fluid flows in an opposite direction. That is, when a fluid increases to the first chamber 510, the piston 310 moves toward the second chamber 520, and a fluid received in the second chamber 520 is discharged to the outside. In this case, a fluid is discharged to the outside in order opposite to the foregoing order.
  • the first connection pin flow path 630 and the second connection pin flow path 730 are extended in an axial direction from a central portion of the connection pin 400 to be formed to a predetermined length.
  • the first connection pin flow path 630 and the second connection pin flow path 730 are not directly connected to be each extended in a radial direction, and both sides communicate with the outside of the connection pin 400, respectably.
  • One side of each each connection pin flow path 630, 730 communicates with the outside of the actuator, and the other side thereof communicates with the first cavity 620 and the second cavity 720, respectably to be described.
  • connection pin flow path 630, 730 are extended in an axial direction to be connected to the outside or when the connection pin 400 is fixed not to rotate to the outside, the flow path of the connection pin 400 may be extended in an axial direction to be connected to a flow path of the outside.
  • the first cavity 620 and the second cavity 720 may be a space formed by an outer surface of the connection pin 400 and an inner surface of the hinge portion 200.
  • the first cavity 620 and the second cavity 720 become a ring-shaped space in a rotation direction at an outer surface of the connection pin 400 in order to enclose the connection pin 400 to each be a connection flow path.
  • the first cavity 620 and the second cavity 720 each are disposed to secure an independent fluid path at a distance separated by a predetermined distance in an axial direction of the connection pin 400.
  • a concave groove may be formed along an inner surface of the hinge portion 200. Therefore, a flow cross-sectional area may be secured to smoothly move a fluid of a predetermined flow rate or more.
  • the first connection pin flow path 630 and the second connection pin flow path 730 may be connected to the first cavity 620 and the second cavity 720, respectively. That is, a point communicated in an axial direction in the first connection pin flow path 630 and the second connection pin flow path 730 may be a point on the first cavity 620 and the second cavity 720.
  • the first internal flow path 610 and the second internal flow path 710 connect the first cavity 620 and the second cavity 720; and the first chamber 510 and the second chamber 520, respectively.
  • the first internal flow path 610 is formed from an inside of the hinge portion 200 so as to be connected to the first cavity 620, is formed from one point of the first cavity 620 in a radial direction of the hinge portion 200, and is extended by a predetermined distance in a length direction of the housing 100. Thereafter, the first internal flow path 610 may be formed in a radial direction of the housing 100 to be connected to the first chamber 510 within the housing 100.
  • the second internal flow path 710 is formed within the housing 100 so as to connect the second cavity 720 and the second chamber 520.
  • first internal flow path 610 and the second internal flow path 710 may be connected to the opposite end portion side of the first chamber 510 and the second chamber 520.
  • first internal flow path 610 and the second internal flow path 710 may include various shapes and paths according to a shape and a connection pipe of the hinge portion 200 and a cylinder and a shape of the housing 100.
  • the first flow path 600 and the second flow path 700 may be formed at the inside of the housing 100, the hinge portion 200, and the inside of the connection pin 400.
  • the first connection pin flow path 630 and the second connection pin flow path 730 are formed in a radial direction of the connection pin 400, even if the connection pin 400 rotates, the first connection pin flow path 630 and the second connection pin flow path 730 may be continuously connected to the first cavity 620 and the second cavity 720.
  • FIG. 3 a portion of the first connection pin flow path 630, the first cavity 620, the first internal flow path 610, and the housing 100 are shown.
  • a first flow path 600 is formed in which the first connection pin flow path 630 formed in a radial direction is continuously connected to the first cavity 620 and thus the first connection pin flow path 630 and the first chamber 510 are finally connected.
  • FIG. 3b illustrates a configuration in which the second connection pin flow path 730 is connected to the second chamber 520 through the second cavity 720, and even if the connection pin 400 rotates, the second flow path 700 may continuously be connected to the second chamber 520.
  • first cavity 620 the second cavity 720, a first sealing member 810, and second sealing members 820 will be described in detail with reference to FIGS. 4 and 5 .
  • FIG. 4 is a cut-away perspective view illustrating a hinge portion 200 taken along line C-C' of FIG. 1
  • FIG. 5 is a cross-sectional view illustrating the linear hydraulic actuator taken along line C-C' of FIG. 1 .
  • the first cavity 620 and the second cavity 720 maybe separated by a predetermined distance in an axial direction of the connection pin 400.
  • the first sealing member 810 may be provided.
  • a type of the first sealing member 810 may be selected according to a fluid kind, and as the first sealing member 810 is formed in a ring shape, even if the connection pin 400 rotates, the first sealing member 810 prevents a fluid from moving in an axial direction.
  • the second sealing members 820 are provided at the outside of each of the first cavity 620 and the second cavity 720, respectably. Each second sealing member 820 prevents a fluid from being leaked in an axial direction, as in the first sealing member 810 and may be configured to seal even when the connection pin 400 rotates.
  • a wear ring 900 is provided within the hinge portion 200 and is configured to prevent the hinge portion 200 or the connection pin 400 from being damaged by a friction when the connection pin 400 rotates. Further, when a force operates in a length direction of the actuator, i.e., a radial direction of the connection pin 400, the wear ring 900 is provided to uniformly support. A plurality of wear rings 900 may be provided to be separated by a predetermined gap in a length direction of the connection pin 400. Such a wear ring 900 is a generally much used configuration and therefore a detailed description of a material and a shape thereof may be omitted.
  • the present exemplary embodiment may include constituent elements corresponding to those of the foregoing exemplary embodiment, and in order to avoid a repeated description, a detailed description thereof is omitted, and only dissimilar constituent elements will be described.
  • FIG. 6 is a conceptual diagram illustrating a linear hydraulic actuator according to a second exemplary embodiment
  • FIG. 7 is a cross-sectional view illustrating the linear hydraulic actuator taken along line A-A' and B-B' of a second exemplary embodiment.
  • connection pin 400 is connected to the hinge portion 200 provided toward the piston load 320, and a configuration is shown that supplies a fluid to each chamber through the first internal flow path 610 and the second internal flow path 710 formed within the piston load 320.
  • the first internal flow path 610 communicates with the first chamber 510 through the the piston 310, and the second internal flow path 710 passes through the piston 310 to communicate with the second chamber 520 side.
  • first internal flow path 610 and the second internal flow path 710 may be extended in a length direction from the hinge portion 200 of the piston load 320 through the piston 310 and be separated by a predetermined distance in a thickness direction.
  • connection pin 400 rotates within the hinge portion 200, for continuous inflow and outflow of a fluid, cavities 620 and 720 and connection pin flow paths 630 and 730 may be provided, as in a first exemplary embodiment.
  • FIG. 8 is a cross-sectional view illustrating a linear hydraulic actuator according to a third exemplary embodiment.
  • the present exemplary embodiment may include constituent elements corresponding to those of the foregoing exemplary embodiment, and in order to avoid a repeated description, a detailed description thereof is omitted, only dissimilar constituent elements will be described.
  • the first cavity 620 and the second cavity 720 are formed in an arc shape instead of a ring shape when viewed from an axial direction of the connection pin 400.
  • a relative rotation angle of the fixed hinge portion 200 may be 360° or less, and even when a stroke of the piston 310 is maximum-minimum, the hinge portion 200 moves only a predetermined angle ⁇ . Therefore, because the connection pin 400 rotates within a predetermined angle, a cavity is formed to correspond to a predetermined angle ⁇ and thus even when the connection pin 400 is rotating, the cavity may continuously fluidically communicate.
  • the connection pin 400 is fixed to an external structure, and a flow path of the connection pin 400 formed in a radial direction moves only within an angle in which a cavity is formed when the actuator drives.
  • a linear hydraulic actuator according to the present invention is configured to receive a hydraulic pressure from the hinge portion 200 and the connection pin 400, an influence of elasticity of a hose may be ignored and thus by enhancing control rigidity, a precise and robust control performance can be secured, and upon designing, a hose may be ignored and thus the degree of freedom of a design can be enhanced.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP17799570.1A 2016-05-20 2017-04-14 Linearer hydraulikaktuator Withdrawn EP3460260A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020160061843A KR101768620B1 (ko) 2016-05-20 2016-05-20 선형 유압 액추에이터
PCT/KR2017/004051 WO2017200212A1 (ko) 2016-05-20 2017-04-14 선형 유압 액추에이터

Publications (2)

Publication Number Publication Date
EP3460260A1 true EP3460260A1 (de) 2019-03-27
EP3460260A4 EP3460260A4 (de) 2019-12-11

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ID=59753151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17799570.1A Withdrawn EP3460260A4 (de) 2016-05-20 2017-04-14 Linearer hydraulikaktuator

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EP (1) EP3460260A4 (de)
KR (1) KR101768620B1 (de)
WO (1) WO2017200212A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11187206B2 (en) * 2017-10-17 2021-11-30 Vestas Wind Systems A/S Pitch system for a wind turbine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4718330A (en) * 1982-01-18 1988-01-12 Eltra Corporation Hydraulic cylinder
JPH01148105U (de) * 1988-04-01 1989-10-13
JP2989461B2 (ja) * 1994-01-24 1999-12-13 三菱重工業株式会社 ジャッキ
DE9411004U1 (de) * 1994-06-22 1994-08-18 Blüthgen, Wilfried, Dipl.-Ing., 38102 Braunschweig Maschine mit einem hydraulisch in seiner Länge veränderbaren, um einen Kolbenbolzen schwenkbaren Hebel
SE510463C2 (sv) * 1996-11-26 1999-05-25 Pos Line Ab Förfarande och anordning för att eliminera kolvstångsrusning vid start av pneumatisk motor
KR100488207B1 (ko) * 1998-06-15 2005-07-07 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비의 붐과 아암의 연결구조
AT408209B (de) * 2000-03-23 2001-09-25 Hoerbiger Hydraulik Betätigungsanordnung für bewegbare teile an fahrzeugen
JP4525155B2 (ja) * 2004-04-26 2010-08-18 Ｓｍｃ株式会社 リニアアクチュエータ
DE202007005803U1 (de) * 2007-04-19 2007-09-20 Berends, Reiner Zylindermedienversorgung mittels Kugeldrehdurchführung und doppeltem Zylinderrohr
US8715132B2 (en) * 2010-12-31 2014-05-06 Woodward Hrt, Inc. Linear actuator and method of operation thereof

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Publication number Publication date
WO2017200212A1 (ko) 2017-11-23
KR101768620B1 (ko) 2017-08-17
EP3460260A4 (de) 2019-12-11

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