Title:
HYDRAULIC ACTUATOR TO WHICH LIMIT-ADJUSTABLE MECHANICAL LOCK DEVICE IS APPLIED
Document Type and Number:
WIPO Patent Application WO/2017/086594
Kind Code:
A1
Abstract:
The present invention relates to a hydraulic actuator to which a limit-adjustable mechanical lock device is applied, the actuator comprising: a housing having a first hole in which a piston, having a rack gear formed on one side thereof such that a pinion gear for shaft-fixing a valve shaft is gear-coupled thereto, is accommodated so as to be movable at a predetermined length, the piston of which both end portions are recessed at a predetermined depth, and a ball insertion groove formed on the inner peripheral surface of a recessed part; side covers coupled at both sides of the housing, and having holder insertion holes formed to be opened toward the first hole side of the housing, and plugs coupled, by screw coupling, to the cross sections thereof, which are opposite to the housing, such that the holder insertion holes are blocked from the outside; a first holder of which one side of the outer peripheral surface is inserted into the holder insertion hole at the plug side of the side cover by screw coupling, having a second hole of which the inside is empty such that the second hole is opened toward the first hole side, and allowing hydraulic pressure to flow in and out at the peripheral surface of the second hole; a second holder fitted and coupled to the inner peripheral surface of the side cover and having one end thereof screw-coupled to the second hole of the first holder, and having a third hole opened toward the first hole side and allowing a cross section of the second hole side to be penetrated at an inner diameter smaller than that of the second hole; a locking means into which a rod is inserted so as to be movable in an axial direction at a predetermined length across the second hole of the first holder and the third hole of the second holder, wherein the rod allows a ball to be inserted into or separated from the ball insertion hole of the piston by the elasticity of a spring and the hydraulic pressure of predetermined pressure or higher, which is supplied to the first holder, such that the piston is locked or unlocked; and a flow path enabling fluid to pass both the second hole of the first holder and the housing through the side covers and be supplied to the first hole at the front end of the second holder.
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Inventors:
LEE YONG JUN (KR)
Application Number:
PCT/KR2016/011022
Publication Date:
May 26, 2017
Filing Date:
September 30, 2016
Export Citation:
Assignee:
LEE YONG JUN (KR)
International Classes:
F15B15/20; F15B15/06; F15B15/08; F15B15/14; F15B15/24; F16K31/12
Foreign References:
| KR20010087319A | 2001-09-15 | |||
| JPH11247959A | 1999-09-14 | |||
| JP2000199503A | 2000-07-18 | |||
| KR101006896B1 | 2011-01-13 | |||
| KR101424423B1 | 2014-08-01 |
Other References:
See also references of EP 3255286A4
None
None
Attorney, Agent or Firm:
CHOI, Sung-Keun (KR)
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