WO2021091084A1 - An improved leverage device of a hydraulic pressure remote control valve - Google Patents

An improved leverage device of a hydraulic pressure remote control valve Download PDF

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Publication number
WO2021091084A1
WO2021091084A1 PCT/KR2020/013237 KR2020013237W WO2021091084A1 WO 2021091084 A1 WO2021091084 A1 WO 2021091084A1 KR 2020013237 W KR2020013237 W KR 2020013237W WO 2021091084 A1 WO2021091084 A1 WO 2021091084A1
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Prior art keywords
reciprocating plunger
tilting
reciprocating
involute curve
contact
Prior art date
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PCT/KR2020/013237
Other languages
French (fr)
Inventor
Nag Bok Lim
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Daehyun Hydraulics Co., Ltd.
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Filing date
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Application filed by Daehyun Hydraulics Co., Ltd. filed Critical Daehyun Hydraulics Co., Ltd.
Publication of WO2021091084A1 publication Critical patent/WO2021091084A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
    • F16K11/14—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by one actuating member, e.g. a handle
    • F16K11/16—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by one actuating member, e.g. a handle which only slides, or only turns, or only swings in one plane
    • F16K11/168—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by one actuating member, e.g. a handle which only slides, or only turns, or only swings in one plane only swings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/60—Handles
    • F16K31/602—Pivoting levers, e.g. single-sided
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/0422—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with manually-operated pilot valves, e.g. joysticks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/46—Mechanical actuating means for remote operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K35/00—Means to prevent accidental or unauthorised actuation
    • F16K35/04—Means to prevent accidental or unauthorised actuation yieldingly resisting the actuation

Definitions

  • the present invention relates to a leverage device of a hydraulic pressure remote control valve of a hydraulic actuator in hydraulic equipments. More specifically, the present invention relates to a leverage contact face of a leverage device for operating at least a reciprocating plunger which activates a spool for throttling fluid flow in a system to reduce a high fluid into a pilot pressure of a hydraulic actuator, such as a directional control joystick valve or foot valve, or a break control system of hydraulic equipments.
  • a hydraulic actuator such as a directional control joystick valve or foot valve, or a break control system of hydraulic equipments.
  • a prior art such as U.S. Patent 6,125,886 filed Nov. 18, 1998, discloses a pilot valve having a leverage device, as shown in FIG. 2, used for controlling actuator of hydraulic equipment.
  • a reciprocating plunger (125) in plural with a hemi-spherical contour at a head end portion, is controlled by contacting with a conical face(146) provided on a manipulating disc (143) at a portion of a manipulating lever(40) which is pivoted on a point (148) on a valve body(101).
  • a displacement of said reciprocating plunger(125) by tilting operation of a manipulating disc (143) applies a pushing force downward on a spring(134) biasing a spool(135)
  • a pilot pressure in secondary pressure chamber(104) applies a force up ward at under face of a larger annular ring (137) of said spool, so that said spool is balanced to be located in a throttling position with a couple of concentric internal bore(118,119) of valve body(101) to throttle fluid flow from a primary pressure chamber(103) to said secondary pressure chamber(104) and also from said secondary pressure chamber to said return oil chamber(105), so that a pilot pressure is controlled.
  • a conical face(146) contacts with a hemi-spherical surface of on a head of single reciprocating plunger (125), of which contact point forms a contact trace traveling beyond top dead center.
  • a leverage force on a point being offset from top dead center of the reciprocating plunger (125) generates a longitudinal force including a traverse force on a reciprocating plunger (125).
  • the traverse force causes a friction wear between a peripheral surface of a reciprocating plunger and a cylindrical plug hole (102), which increases a clearance of a sliding surface of a reciprocating plunger during long time operation. Oil leakage through an enlarged hole clearance contaminates an environment in a control cabin of an operator.
  • said manipulating disc operates two reciprocating plungers in adjacent simultaneously by tilting into a direction between two plungers in adjacent, whereof swing radius of a contact point respectively from a pivot point (148) has a shorter than the one toward a single reciprocating plunger so that a bigger traverse force due to an edge effect is applied on a reciprocating plunger.
  • Korea Patent KR10-1265542 filed May 13, 2013, discloses a leverage contact face characterized by being formed with cycloid curve , contacting with a reciprocating plunger of which head end provides a hemi-spherical surface, however a traverse force on reciprocating plunger due to offset contact from a centerline of reciprocating plunger still remains.
  • the object of the present invention is to provide an improved leverage device of a hydraulic pressure remote control valve having an involute curve (50) which is able to contact on only a point in a centerline(60) of a reciprocating plunger, as shown in FIG.1, on a base of an involute theory that an involute curve of a base circle radius has one vertical taut string regardless tilting angle of a manipulating lever(40), reducing traverse force on a reciprocating plunger, consisting,
  • valve body(1) providing at least a throttle orifice(70,71), reducing high fluid pressure of a high pressure port(10) into a pilot fluid pressure in a reduced pressure port(11,11');
  • a spherical ball(90) provided rotatably at a head portion of a reciprocating plunger, contacting with an involute curve face(46) in a rolling contact;
  • said leverage contact face(45') is characterized by an involute curve surface(46') being formed with at least a singular involute curve(50) duplicated laterally for contacting with a reciprocating plunger(25,25') of which base circle radius defined by a distance from a centerline(60) of a said reciprocating plunger(25) to a tilting center(48).
  • said leverage contact face(45) is characterized by an involute curve surface(46) formed with an involute curve(50,53,55) in plural, of which base circle radius is defined by a perpendicular distance(50', 53', 55') from a centerline(60) of a reciprocating plunger(25) to a tilting axis(47,51,52) respectively, so that each of an involute curve is contained in a theoretical plain(63,64,64') parallel to a tilting direction(56,57,58) of a manipulating disc(43) between adjacent reciprocating plungers for left pair(25,26) or right pair(25,26').
  • involute curves generated as above, having a common initiating point(49) on a centerline(60) of a reciprocating plunger(25) and in different contours due to different base circle radii which are parallel with various tilting direction(56,57,58) of manipulating disc(43) respectively as shown in FIG.4, are rendered to become a involute curve surface(46) in a shape like a clam shell on a portion of manipulating disc(43), of which left side face(46-1) is symmetrically apposite against right side face(46-2) as shown in FIG.
  • a reciprocating plungers(25) located on each of contact points (49) with a reciprocating plungers(25) always lie on a point on the centerline(60) of a reciprocating plunger (25) for operating not only a single reciprocating plunger(25) but also a pair of reciprocating plungers(25,26) in adjacent coincidently, reducing traverse force on reciprocating plunger during operation resulting low wear of sliding surfaces between a reciprocating plunger(25) and a hole(2) of a cylindrical plug(27) otherwise causing fluid leak, contaminating an operator's working environment.
  • FIG. 1 is a sectional view showing first embodiment of a hydraulic pressure remote control valve according to the present invention
  • FIG. 2 is a sectional view showing an embodiment of a hydraulic pressure remote control valve according to a prior art
  • FIG. 3 is a sectional view showing second embodiment of a hydraulic pressure remote control valve according to the present invention.
  • FIG. 4 is a geometric diagram showing an involute curve face(46) consisted with an involute curves in plural defined by a base circle radius on a tilting axis respectively, contacting not only with a single reciprocating plunger but also with a pair of plungers in adjacent according to the present invention
  • FIG. 5 is a bird view showing a bird view of an involute contact face in plural on a portion of manipulating disc(43) of first embodiment, for operating single or double plungers in adjacent coincidently, according to the present invention
  • FIG. 6 is a bird view showing a detachable parts on a portion of manipulating disc, having an involute contact face according to the present
  • FIG. 7 is a bird view showing a bird view of a manipulating lever in a pedal form of second embodiment of a involute contact face consisting an involute curve duplicated in lateral direction on a portion of manipulating lever(40'), for operating single plunger according to the present invention.
  • FIG.1 and FIG.3 there are shown first embodiment and second embodiment of a hydraulic pressure remote control valve, according to the present invention, therein,
  • valve body(1) providing, a tilting center (48) of an manipulating lever (40,40') at a central portion of body, and a vertical cavity (44) in plural arrayed in a distance from said tilting center (48);
  • a secondary pressure chamber(4) in plural for each of a said vertical cavity (44) respectively, at a location between a return oil chamber(5) and a primary pressure chamber (3), provided for a communicating to a working chamber(7) of an external actuator(300) through a communication passage(14) and a secondary pressure port(11) in plural respectively;
  • a spring seat plate (33) in a shape of a circular disc plate with a hole at a center portion, abutted between a bottom end of a said reciprocating plunger (25) and a spring (35), so that a down stroke of a said reciprocating plunger (25) activate a spool(34) being pushed downward, and another spring(42) for pushing a said spring seat plate(33) upward;
  • a spool (34) having two annular rings (37, 38) in a different diameter, inserted movably into concentric internal bores(18,19) of a said sleeve(16), so that annular rings(37,38) and said concentric internal bores(18,19) are forming a couple of throttle orifice(70,71);
  • an involute curve with a base circle radius is contained in a theoretical plain(63,64,64') that is parallel to a tilting direction(56,57,58,) of a manipulating disc(43) respectively, so that said involute curves in different contours due to different base circle radii, initiates on a contact point(49) of a centerline(60) of a reciprocating plunger(25) consisting a surface, in a shape like a clam shell, of which left side face(46-1) is symmetrically apposite against right side face(46-2) as shown in FIG. 6.
  • a manipulating lever(40) is able to be tilted at a pivot center(48) to a direction(56) toward a longitudinal centerline(60) of a reciprocating plunger(25), or tilted into an arbitrary direction (57,58) between reciprocating plungers in adjacent.
  • a spring seat plate (33) is pushed down by a reciprocating plunger(25), a spring force of said spring (35) is increased to push said spool (34) of which annular ring (37) receives a pressure of said secondary pressure chamber (4).
  • said spool (34) move downward, that said annular rings (38) opens said throttle orifice (71) allowing oil flow from a primary pressure chamber (3) to a secondary pressure chamber (4), and in a same time, said annular ring (37) closes said throttle orifice (70) to squeeze a fluid flow from a secondary pressure chamber (4) to a return oil chamber (5).
  • one of said throttle orifices (70,71) is opened and the other is closed in a set and vice versa repeatedly, according to a position of said spool (34) in a balance between a downward force of a spring and upward force of a hydraulic fluid force according to a tilting angle of manipulating disc, so that a secondary pressure is controlled and supplied to an hydraulic actuator (300) via communication passage (14) and connecting port (11).
  • said manipulating disc(43) For returning a neutral position, said manipulating disc(43) is tilted back to a upright position, an elastic force of a spring (42) pushing up a spring seat plate(33) and a reciprocating plunger, and said spool (34) is also lifted up by said spring seat plate(33) abutting with an stop ring (36) at a head portion of said spool(34), so that said throttle orifice (71) between said primary pressure chamber(3) and said secondary pressure chamber(4) is closed to cut off high pressure , and in a same time, said throttle orifice (70) between said secondary pressure chamber(4) and said return oil chamber (5) is opened to recovering neutral position of a external actuator(300).
  • a manipulating lever(40) is able to be tilted at a pivot center(48) to a direction(56) forward(56) or backwards(56'), toward a longitudinal centerline(60) of a single reciprocating plunger(25), as shown in FIG.3, said involute contact face (46) pushes down a reciprocating plungers (25) by contacting with a point(49) included in a longitudinal center line(60) of a reciprocating plunger (25) in a rolling contact, reducing traverse force on reciprocating plunger(25).
  • valve body between first embodiment and second embodiment according to the present invention Due to a structural resemblance of valve body between first embodiment and second embodiment according to the present invention, as shown in FIG.1 and FIG.3, said reciprocating plunger has same individual function with related parts, so that further description on valve operation of second embodiment is omitted for a simplicity of description.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

The present invention provides an improved leverage device of a hydraulic pressure remote control valve having a leverage contact face(46) characterized by being constructed with at least an involute curve(53) enabling that a contact point (49) always lies on a centerline(60) of a reciprocating plunger (25) for respectively, for operating not only a single plunger but also a pair of reciprocating plungers in adjacent coincidently, reducing traverse force on reciprocating plunger.

Description

AN IMPROVED LEVERAGE DEVICE OF A HYDRAULIC PRESSURE REMOTE CONTROL VALVE
The present invention relates to a leverage device of a hydraulic pressure remote control valve of a hydraulic actuator in hydraulic equipments. More specifically, the present invention relates to a leverage contact face of a leverage device for operating at least a reciprocating plunger which activates a spool for throttling fluid flow in a system to reduce a high fluid into a pilot pressure of a hydraulic actuator, such as a directional control joystick valve or foot valve, or a break control system of hydraulic equipments.
A prior art, such as U.S. Patent 6,125,886 filed Nov. 18, 1998, discloses a pilot valve having a leverage device, as shown in FIG. 2, used for controlling actuator of hydraulic equipment. Wherein a reciprocating plunger (125) in plural with a hemi-spherical contour at a head end portion, is controlled by contacting with a conical face(146) provided on a manipulating disc (143) at a portion of a manipulating lever(40) which is pivoted on a point (148) on a valve body(101).
Whereby, a displacement of said reciprocating plunger(125) by tilting operation of a manipulating disc (143) applies a pushing force downward on a spring(134) biasing a spool(135), and a pilot pressure in secondary pressure chamber(104) applies a force up ward at under face of a larger annular ring (137) of said spool, so that said spool is balanced to be located in a throttling position with a couple of concentric internal bore(118,119) of valve body(101) to throttle fluid flow from a primary pressure chamber(103) to said secondary pressure chamber(104) and also from said secondary pressure chamber to said return oil chamber(105), so that a pilot pressure is controlled.
Wherein, during said manipulating disc(143) is tilting on a single reciprocating plunger (125), said a conical face(146) contacts with a hemi-spherical surface of on a head of single reciprocating plunger (125), of which contact point forms a contact trace traveling beyond top dead center. So that a leverage force on a point being offset from top dead center of the reciprocating plunger (125) generates a longitudinal force including a traverse force on a reciprocating plunger (125). The traverse force causes a friction wear between a peripheral surface of a reciprocating plunger and a cylindrical plug hole (102), which increases a clearance of a sliding surface of a reciprocating plunger during long time operation. Oil leakage through an enlarged hole clearance contaminates an environment in a control cabin of an operator.
Especially, said manipulating disc operates two reciprocating plungers in adjacent simultaneously by tilting into a direction between two plungers in adjacent, whereof swing radius of a contact point respectively from a pivot point (148) has a shorter than the one toward a single reciprocating plunger so that a bigger traverse force due to an edge effect is applied on a reciprocating plunger.
Korea Patent KR10-1265542 filed May 13, 2013, discloses a leverage contact face characterized by being formed with cycloid curve , contacting with a reciprocating plunger of which head end provides a hemi-spherical surface, however a traverse force on reciprocating plunger due to offset contact from a centerline of reciprocating plunger still remains.
The object of the present invention is to provide an improved leverage device of a hydraulic pressure remote control valve having an involute curve (50) which is able to contact on only a point in a centerline(60) of a reciprocating plunger, as shown in FIG.1, on a base of an involute theory that an involute curve of a base circle radius has one vertical taut string regardless tilting angle of a manipulating lever(40), reducing traverse force on a reciprocating plunger, consisting,
a valve body(1) providing at least a throttle orifice(70,71), reducing high fluid pressure of a high pressure port(10) into a pilot fluid pressure in a reduced pressure port(11,11');
at least a reciprocating plunger(25,25',26,26'), provided movably through a hole (2) of a cylindrical plug(27,27') in plural which is inserted respectively into a vertical cavity(44) of a valve body(1), of which displacement due to a tilting angle of an involute curve face(46), enables to adjust a least a throttle orifice (70,71) formed between a spool(34) and a sleeve(16) respectively, achieving reduced pressure in a reduced pressure port (11);
a spherical ball(90) provided rotatably at a head portion of a reciprocating plunger, contacting with an involute curve face(46) in a rolling contact;
a manipulating disc(43) on a manipulating lever(40) tilting at a tilting center(48) at a portion of said valve body(1);and
a leverage contact face(45) provided on a portion of said manipulating disc(43), contacting with a said reciprocating plunger,
Wherein, for an operation of a singular reciprocating plunger, a manipulating disc tilts forward(56) or backward(56') as shown in FIG.3 and FIG.7, said leverage contact face(45') is characterized by an involute curve surface(46') being formed with at least a singular involute curve(50) duplicated laterally for contacting with a reciprocating plunger(25,25') of which base circle radius defined by a distance from a centerline(60) of a said reciprocating plunger(25) to a tilting center(48).
For an operation of a pair of reciprocating plunger coincidently, as shown in FIG.1 and FIG.4, a manipulating lever(40) tilts into a inter-direction(57,58) between two reciprocating plungers contacting with reciprocating plungers(25& 26,25&26') coincidently, said leverage contact face(45) is characterized by an involute curve surface(46) formed with an involute curve(50,53,55) in plural, of which base circle radius is defined by a perpendicular distance(50', 53', 55') from a centerline(60) of a reciprocating plunger(25) to a tilting axis(47,51,52) respectively, so that each of an involute curve is contained in a theoretical plain(63,64,64') parallel to a tilting direction(56,57,58) of a manipulating disc(43) between adjacent reciprocating plungers for left pair(25,26) or right pair(25,26').
Whereby, involute curves, generated as above, having a common initiating point(49) on a centerline(60) of a reciprocating plunger(25) and in different contours due to different base circle radii which are parallel with various tilting direction(56,57,58) of manipulating disc(43) respectively as shown in FIG.4, are rendered to become a involute curve surface(46) in a shape like a clam shell on a portion of manipulating disc(43), of which left side face(46-1) is symmetrically apposite against right side face(46-2) as shown in FIG. 6, located on each of contact points (49) with a reciprocating plungers(25) always lie on a point on the centerline(60) of a reciprocating plunger (25) for operating not only a single reciprocating plunger(25) but also a pair of reciprocating plungers(25,26) in adjacent coincidently, reducing traverse force on reciprocating plunger during operation resulting low wear of sliding surfaces between a reciprocating plunger(25) and a hole(2) of a cylindrical plug(27) otherwise causing fluid leak, contaminating an operator's working environment.
The novel feature of this invention itself, both as to its construction and its method of operation, together with objects and advantages thereof, will become apparent from the following detailed description of specific embodiments when considered in conjunction with the accompanying drawings, wherein;
FIG. 1 is a sectional view showing first embodiment of a hydraulic pressure remote control valve according to the present invention;
FIG. 2 is a sectional view showing an embodiment of a hydraulic pressure remote control valve according to a prior art;
FIG. 3 is a sectional view showing second embodiment of a hydraulic pressure remote control valve according to the present invention;
FIG. 4 is a geometric diagram showing an involute curve face(46) consisted with an involute curves in plural defined by a base circle radius on a tilting axis respectively, contacting not only with a single reciprocating plunger but also with a pair of plungers in adjacent according to the present invention;
FIG. 5 is a bird view showing a bird view of an involute contact face in plural on a portion of manipulating disc(43) of first embodiment, for operating single or double plungers in adjacent coincidently, according to the present invention;
FIG. 6 is a bird view showing a detachable parts on a portion of manipulating disc, having an involute contact face according to the present
invention; and
FIG. 7 is a bird view showing a bird view of a manipulating lever in a pedal form of second embodiment of a involute contact face consisting an involute curve duplicated in lateral direction on a portion of manipulating lever(40'), for operating single plunger according to the present invention.
Referring now to the drawings in detail and initially to FIG.1 and FIG.3, there are shown first embodiment and second embodiment of a hydraulic pressure remote control valve, according to the present invention, therein,
a valve body(1) providing, a tilting center (48) of an manipulating lever (40,40') at a central portion of body, and a vertical cavity (44) in plural arrayed in a distance from said tilting center (48);
a return oil chamber(5) in an internal portion of valve body(1), communicating with each of a said vertical cavity(44), having a return oil passage (15) which communicates with oil tank reservoir (not shown);
a primary pressure chamber(3) in an internal portion of said valve body(1) communicating with each of a said vertical cavity(44), having a communication passage (13) and a high pressure port(10) communicating with a pressure source(6);
a secondary pressure chamber(4) in plural for each of a said vertical cavity (44) respectively, at a location between a return oil chamber(5) and a primary pressure chamber (3), provided for a communicating to a working chamber(7) of an external actuator(300) through a communication passage(14) and a secondary pressure port(11) in plural respectively;
a manipulating disc(43) on a portion of said manipulating lever;
a cylindrical plug(27) in plural having a hole (2) with a couple of sealing elements(30,31) inserted respectively in a said vertical cavity(44);
a reciprocating plunger(25) in plural installed movably in a said hole(2) respectively;
a sleeve (16) in plural contained in a said vertical cavity (44) respectively having concentric internal bores(17, 18, 19) in different diameter with a radial passage (22,23,24) in plural respectively, which is communicating with said return oil chamber(5), said secondary pressure chamber(4) and said primary pressure chamber (3) respectively;
a spring seat plate (33) in a shape of a circular disc plate with a hole at a center portion, abutted between a bottom end of a said reciprocating plunger (25) and a spring (35), so that a down stroke of a said reciprocating plunger (25) activate a spool(34) being pushed downward, and another spring(42) for pushing a said spring seat plate(33) upward;
a spool (34) having two annular rings (37, 38) in a different diameter, inserted movably into concentric internal bores(18,19) of a said sleeve(16), so that annular rings(37,38) and said concentric internal bores(18,19) are forming a couple of throttle orifice(70,71); and
an involute curve face (46) in plural, in a first embodiment according to the present invention, located on said manipulating disc(43), as shown in FIG 5, at a position of contacting with a said reciprocating plunger, is formed with an involute curve(50,53,55) in plural, of which base circle radius is defined by a perpendicular distance(50', 53', 55') from a centerline(60) of a said reciprocating plunger(25) to a tilting axis(47,51,52) respectively. Wherein an involute curve with a base circle radius is contained in a theoretical plain(63,64,64') that is parallel to a tilting direction(56,57,58,) of a manipulating disc(43) respectively, so that said involute curves in different contours due to different base circle radii, initiates on a contact point(49) of a centerline(60) of a reciprocating plunger(25) consisting a surface, in a shape like a clam shell, of which left side face(46-1) is symmetrically apposite against right side face(46-2) as shown in FIG. 6.
An involute curve face (46'), in a second embodiment according to the present invention, for a reciprocating plunger operation that a manipulating disc tilts forward or backward, similar as in a pedal control as shown in FIG.3 and FIG.7, is constructed with a singular involute curve(50) duplicated in lateral direction on a portion of manipulating lever(40') tilting at a tilting center(48) in a tilting axis( 47), for contacting with a reciprocating plunger(25,25') of which base circle radius defined by a distance between a centerline(60,60') of a said reciprocating plunger(25) and said tilting center(48);
Hereinafter a description about an operation of a preferred embodiment according to the present invention will be made.
In an operation of a first embodiment as shown in FIG.1 and FIG.4, a manipulating lever(40) is able to be tilted at a pivot center(48) to a direction(56) toward a longitudinal centerline(60) of a reciprocating plunger(25), or tilted into an arbitrary direction (57,58) between reciprocating plungers in adjacent.
When a manipulating lever(40) is tilted at a tilting center(48) to a direction(56) toward a longitudinal centerline(60) of a reciprocating plunger(25), as shown in FIG1 and FIG.4, said involute contact face (46) pushes down a reciprocating plungers (25) by contacting with a contact point(49) which is included in a longitudinal center line(60) of a reciprocating plunger (25) in a rolling contact, reducing traverse force on reciprocating plunger(25).
When a manipulating lever(40) is tilted to an direction(57,58) between reciprocating plungers in adjacent as shown in FIG. 4, said involute contact face (46) pushes down a pair of a reciprocating plungers in left side (25,26) or right side(25,26') respectively by contacting with a point(45,45',49) included in a longitudinal center line(60, 61,61') of a reciprocating plunger (25, 26,26') in a rolling contact, reducing traverse force on reciprocating plunger(25,25').
Whereby, a spring seat plate (33) is pushed down by a reciprocating plunger(25), a spring force of said spring (35) is increased to push said spool (34) of which annular ring (37) receives a pressure of said secondary pressure chamber (4). In a start stage, said spool (34) move downward, that said annular rings (38) opens said throttle orifice (71) allowing oil flow from a primary pressure chamber (3) to a secondary pressure chamber (4), and in a same time, said annular ring (37) closes said throttle orifice (70) to squeeze a fluid flow from a secondary pressure chamber (4) to a return oil chamber (5). As thus, a pressure in said secondary oil chamber increases until said annular ring (37) receives a secondary pressue enough to resist against a force of spring (35) so that said spool moves upward to close orifice(71) to squeeze a fluid flow from said primary pressure chamber (3) and in a same time said throttle orifice(70) is opended reducing secondary oil pressue untill maintaining a pressure level. Whereby, one of said throttle orifices (70,71) is opened and the other is closed in a set and vice versa repeatedly, according to a position of said spool (34) in a balance between a downward force of a spring and upward force of a hydraulic fluid force according to a tilting angle of manipulating disc, so that a secondary pressure is controlled and supplied to an hydraulic actuator (300) via communication passage (14) and connecting port (11).
For returning a neutral position, said manipulating disc(43) is tilted back to a upright position, an elastic force of a spring (42) pushing up a spring seat plate(33) and a reciprocating plunger, and said spool (34) is also lifted up by said spring seat plate(33) abutting with an stop ring (36) at a head portion of said spool(34), so that said throttle orifice (71) between said primary pressure chamber(3) and said secondary pressure chamber(4) is closed to cut off high pressure , and in a same time, said throttle orifice (70) between said secondary pressure chamber(4) and said return oil chamber (5) is opened to recovering neutral position of a external actuator(300).
In an operation of a second embodiment , a manipulating lever(40) is able to be tilted at a pivot center(48) to a direction(56) forward(56) or backwards(56'), toward a longitudinal centerline(60) of a single reciprocating plunger(25), as shown in FIG.3, said involute contact face (46) pushes down a reciprocating plungers (25) by contacting with a point(49) included in a longitudinal center line(60) of a reciprocating plunger (25) in a rolling contact, reducing traverse force on reciprocating plunger(25).
Due to a structural resemblance of valve body between first embodiment and second embodiment according to the present invention, as shown in FIG.1 and FIG.3, said reciprocating plunger has same individual function with related parts, so that further description on valve operation of second embodiment is omitted for a simplicity of description.

Claims (3)

  1. An improved leverage device of a hydraulic pressure remote control valve comprising,
    a valve body(1) providing at least a throttle orifice(70,71) reducing a fluid pressure from a high pressure to a pilot pressure;
    at least a reciprocating plunger(25) provided movably through a hole (2) respectively on said valve body(1);
    a manipulating lever(40) having a manipulating disc(43) tilting at a tilting center(48) at a portion of said valve body(1); and
    at least a leverage contact face(45), provided on said manipulating disc(43) contacting with a said reciprocating plunger(25) at a contact point(49), characterized by said leverage contact face(45) is constructed with at least an involute curve(50) forming an involute curve face(46), enabling to contact with only a contact point(49) on a centerline(60) of a said reciprocating plunger (25) during said manipulating lever (40) is tilting for operations.
  2. An improved leverage device of a hydraulic pressure remote control valve of claim 1, wherein an involute curve face(46), for operating a singular reciprocating plunger(25) tilting at a tilting axis(48) perpendicular to a tilting direction forward(56) or backwards(56'), characterized by being constructed with at least a singular involute curve (50), of which base circle radius(50') is defined by a distance between a center line(60) of said reciprocating plunger(25) to said tilting center(48), enabling to contact with only said contact point(49) on said centerline(60) of a said reciprocating plunger (25) respectively during said manipulating lever (40) is tilting for operations, reducing traverse force on reciprocating plunger during operation.
  3. An improved leverage device of a hydraulic pressure remote control valve of claim1, wherein an involute curve face(46) for operating not only a single reciprocating plunger but also a pair of reciprocating plungers in adjacent coincidently, characterized by being constructed with an involute curve (50, 53, 55) in plural, of which base circle radius(50', 53', 55') is defined by a distance between said center line(60) of said reciprocating plunger(25) to a tilting axis(47, 51,52,) in vertical angle(47', 51', 52',) respectively which is varying according to a tilting direction(56) of said manipulating lever (40) to said center line(60) of said reciprocating plunger(25) or in a tilting direction(57,58) between adjacent reciprocating plungers for right pair(25,26') or left pair(25,26), enabling to contact with only said contact point(49) on said centerline(60) of a said reciprocating plunger (25) respectively for operating a pair of reciprocating plungers in adjacent coincidently, reducing traverse force on reciprocating plunger during operation.
PCT/KR2020/013237 2019-11-04 2020-09-28 An improved leverage device of a hydraulic pressure remote control valve WO2021091084A1 (en)

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KR10-2019-0139545 2019-11-04
KR1020190139545A KR102257572B1 (en) 2019-11-04 2019-11-04 An improved leverage device of a remote hydraulic pressure of control valve

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CN115324963B (en) * 2022-08-18 2023-04-11 杭州爱力智控技术有限公司 Hydraulic power-assisted proportional valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4566492A (en) * 1983-02-15 1986-01-28 Rexroth Sigma Fluid distributing device, more especially for remote control
JP2893426B2 (en) * 1994-11-14 1999-05-24 株式会社小松製作所 Hydraulic pilot valve
KR20000033074A (en) * 1998-11-19 2000-06-15 슈조 수세이 Pilot valve
KR101265542B1 (en) * 2012-12-06 2013-05-20 주식회사 상아정공 Joystick pilot pressure conversion valve for excavator
KR20170078147A (en) * 2015-12-29 2017-07-07 한국산업기술대학교산학협력단 Leakage prevention structure for remote control valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4566492A (en) * 1983-02-15 1986-01-28 Rexroth Sigma Fluid distributing device, more especially for remote control
JP2893426B2 (en) * 1994-11-14 1999-05-24 株式会社小松製作所 Hydraulic pilot valve
KR20000033074A (en) * 1998-11-19 2000-06-15 슈조 수세이 Pilot valve
KR101265542B1 (en) * 2012-12-06 2013-05-20 주식회사 상아정공 Joystick pilot pressure conversion valve for excavator
KR20170078147A (en) * 2015-12-29 2017-07-07 한국산업기술대학교산학협력단 Leakage prevention structure for remote control valve

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