WO2014024521A1 - 建設機械の油圧回路及びその制御装置 - Google Patents
建設機械の油圧回路及びその制御装置 Download PDFInfo
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- WO2014024521A1 WO2014024521A1 PCT/JP2013/060962 JP2013060962W WO2014024521A1 WO 2014024521 A1 WO2014024521 A1 WO 2014024521A1 JP 2013060962 W JP2013060962 W JP 2013060962W WO 2014024521 A1 WO2014024521 A1 WO 2014024521A1
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- control valve
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- directional control
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2282—Systems using center bypass type changeover valves
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
- E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
- E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- 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
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
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- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/255—Flow control functions
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- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3052—Shuttle valves
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- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
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- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
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- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
- F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple output members
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- 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
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
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- 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
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
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- 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
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
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- 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
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
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- 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
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
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- 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
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
Definitions
- the present invention relates to a hydraulic circuit of a construction machine or a control device thereof.
- Some construction machines perform control (bleed-off control) for returning a part (for example, surplus) of pressure oil discharged from a hydraulic pump to a hydraulic oil tank.
- control bleed-off control
- some construction machines have a clearance (bleed opening) for returning pressure oil in the spool of the direction control valve.
- the construction machine performs bleed-off control by changing the opening area of the bleed opening (for example, Patent Document 1).
- a spool of a directional control valve Vm is provided with a plurality of bleed openings Sbo. At this time, the hydraulic circuit performs bleed-off control by changing the opening area of the bleed opening Sbo.
- a bypass passage that bypasses the center bypass passage (RC) and the cylinder port (CprtBm) is further provided.
- the size of the spool of the direction control valve Vm in the longitudinal direction (or the bridge passage Rbm) may be increased.
- the present invention is a hydraulic circuit of a construction machine or a control device thereof, which is made under such circumstances, includes a center bypass passage to which pressure oil discharged from a hydraulic pump is supplied, and performs bleed-off control, It is an object of the present invention to provide a hydraulic circuit for a construction machine or a control device thereof that can reduce pressure loss of pressure oil passing through a center bypass passage and pressure oil supplied to a cylinder port.
- it is a hydraulic circuit of a construction machine including a center bypass passage to which pressure oil discharged from a hydraulic pump is supplied, and includes a plurality of directional control valves arranged in tandem in the center bypass passage.
- a hydraulic circuit for a construction machine is provided, characterized in that the flow rate is controlled.
- the first internal passage has substantially the same passage area regardless of the spool position of the direction control valve, forms the parallel passage corresponding to the passage area, and the plurality of direction control valves include: A hydraulic circuit for a construction machine is provided, wherein pressure oil is supplied only from the parallel passage.
- each first internal passage of the directional control valve group forms a parallel passage.
- a control device for a hydraulic circuit of a construction machine that controls any one of the above hydraulic circuits is provided. Further, there is provided a control device for a hydraulic circuit of a construction machine, wherein the opening area of the bypass switching valve is changed according to operation information input to the construction machine.
- the pressure loss of the pressure oil passing through the center bypass passage and the pressure oil supplied to the cylinder port can be reduced.
- FIG. 1 is a schematic external view illustrating an example of a construction machine according to an embodiment of the present invention. It is a hydraulic circuit diagram explaining an example of the hydraulic circuit of the construction machine which concerns on embodiment of this invention. It is a schematic block diagram explaining an example of the direction control valve of the hydraulic circuit of the construction machine which concerns on embodiment of this invention. It is a schematic block diagram explaining an example of the direction control valve of the hydraulic circuit of the construction machine which concerns on embodiment of this invention. It is a schematic block diagram explaining an example of the direction control valve of the hydraulic circuit of the construction machine which concerns on embodiment of this invention. It is a schematic sectional drawing explaining an example of the cross section (AA cross section of FIG. 3A to FIG.
- this invention is a construction machine provided with a center bypass passage (center bypass line) other than this embodiment, and tanks a part of pressure oil using a cut valve (bleed-off valve, flow control valve, etc.). Any construction machine can be used as long as it is refluxed (bleed-off control).
- Construction machines that can use the present invention include hydraulic excavators, crane trucks, bulldozers, wheel loaders and dump trucks, pile driving machines, pile removers, water jets, mud drainage treatment equipment, grout mixers, deep Includes foundation and drilling machines.
- Construction machine configuration A schematic configuration of a construction machine 100 in which the present invention can be used will be described with reference to FIG.
- the construction machine is a machine that performs a desired operation using a hydraulic actuator (a boom or the like described later).
- the construction machine 100 includes, as hydraulic actuators, a boom 11 whose base end is pivotally supported on the upper swing body 10Up, an arm 12 pivotally supported on the distal end of the boom 11, and a distal end of the arm 12. And a bucket 13 that is pivotally supported.
- the construction machine 100 extends and contracts the boom cylinder 11c in the longitudinal direction by supplying hydraulic oil to the boom cylinder 11c disposed in the gap between the boom 11 and the upper swing body 10Up. At this time, the boom 11 is driven in the vertical direction by expansion and contraction of the boom cylinder 11c.
- the construction machine 100 includes boom direction control valves (for example, Vb1 and Vb2 in FIG. 2 (described later)) that are controlled according to the operation amount (and operation direction) of the operation lever of the operator (driver or operator). Used to control the hydraulic oil supplied to the boom cylinder 11c. As a result, the construction machine 100 performs a desired operation according to the operation amount of the operation lever of the operator.
- the construction machine 100 drives the arm 12 and the bucket 13 by the expansion and contraction of the arm cylinder 12c and the bucket cylinder 13c as in the case of the boom 11.
- the construction machine 100 uses an arm direction control valve (for example, Va1 and Va2 in FIG. 2) and a bucket direction control valve (for example, Vbk in FIG. 2), and the arm cylinder 12c and the bucket.
- the hydraulic fluid supplied to the cylinder 13c is controlled.
- the construction machine 100 travels (moves back and forth, left and right) and rotates (turns, etc.) the main body of the construction machine 100 using wheels and a turning device.
- the construction machine 100 uses, for example, a traveling direction control valve (for example, Vt1, Vt2, and Vst in FIG. 2) to run the construction machine 100 according to the amount of operation of the operation lever of the operator.
- a traveling direction control valve for example, Vt1, Vt2, and Vst in FIG. 2
- a construction machine 100 that can use the present invention includes a hydraulic circuit (described later) 20 that supplies hydraulic oil (pressure oil) from a hydraulic pump to a hydraulic actuator, and a control device (described later) that controls the operation of each component of the construction machine 100. 30).
- a hydraulic circuit 20 that supplies hydraulic oil (pressure oil) from a hydraulic pump to a hydraulic actuator
- a control device that controls the operation of each component of the construction machine 100. 30.
- the hydraulic circuit 20 of the construction machine 100 according to the embodiment of the present invention will be described with reference to FIG.
- the solid line described in FIG. 2 indicates an oil passage (pressure oil passage).
- a solid line to which // is added indicates an electric control system.
- the hydraulic circuit to which the present invention can be applied is not limited to that shown in FIG. That is, the present invention can be applied to any hydraulic circuit as long as it is provided with a center bypass passage and a cut valve is arranged in the center bypass passage on the downstream side of the direction control valve.
- 2 includes two hydraulic pumps, the hydraulic circuit to which the present invention can be applied is not limited to one including two hydraulic pumps. That is, you may use this invention for a hydraulic circuit (construction machine) provided with 1 or 3 or more hydraulic pumps.
- the hydraulic circuit 20 of the construction machine 100 includes two hydraulic pumps mechanically connected to an output shaft of a power source (a prime mover, an engine, a motor, etc.) not shown.
- P first hydraulic pump P1 and second hydraulic pump P2
- two center bypass passages RC first hydraulic pump supplied with pressure oil (operating oil) respectively discharged from the two hydraulic pumps P
- a direction control valve such as the first traveling direction control valve Vt1 that controls the hydraulic actuator (such as the boom 11 in FIG. 1)
- a control valve (straight-running valve) Vst.
- the hydraulic circuit 20 includes a bleed-off valve Vbo (first bleed-off valve Vbo1 and second bleed-off valve Vbo2) disposed downstream (for example, the most downstream) of the center bypass passage RC, and a bleed-off valve Vbo. And a pilot pump Pp (a first pilot pump Pp1 and a second pilot pump Pp2) that generates pressure (discharges pressure oil) to be input to the pilot port (control port). Further, in the present embodiment, the hydraulic circuit 20 further includes a bypass passage RBp for supplying (bypassing) the pressure oil in the center bypass passage RC to the cylinder port, and a bypass switching valve Vps disposed in the bypass passage RBp.
- the bypass passage RBp (and the bypass switching valve Vps) is arranged upstream of the first boom direction control valve Vb1 and the first arm direction control valve Va1.
- the bypass passage of the hydraulic circuit to which the present invention can be applied is not limited to those disposed at these positions. That is, the hydraulic circuit to which the present invention can be applied may be provided with a bypass passage (bypass switching valve) on the upstream side or the downstream side of any directional control valve.
- the hydraulic circuit 20 can use a proportional valve, a proportional control valve, a switching valve, or the like as the bypass switching valve Vps. Further, the hydraulic circuit 20 may use a pre-arranged load check valve as the bypass switching valve Vps.
- a directional control valve (Vt1 or the like) is arranged in series with the center bypass passage RC, and a bleed-off valve Vbo is arranged downstream of the center bypass passage RC.
- the hydraulic circuit 20 has a first travel direction control valve (for example, left travel direction control) in a first center bypass passage RC1 corresponding to the first hydraulic pump P1.
- Valve Vt1, preliminary direction control valve Vop, turning direction control valve Vsw, second boom direction control valve Vb2, first arm direction control valve Va1, and first bleed-off valve Vbo1 in series. It is arranged.
- the hydraulic circuit 20 includes a second traveling direction control valve (for example, a right traveling direction control valve) Vt2 and a bucket direction control valve Vbk in the second center bypass passage RC2 corresponding to the second hydraulic pump P2.
- the first boom direction control valve Vb1, the second arm direction control valve Va2, and the second bleed-off valve Vbo2 are arranged in series.
- the hydraulic circuit 20 has a straight running valve Vst disposed upstream of the second center bypass passage RC2.
- the hydraulic circuit 20 has a plurality of directional control valves arranged in series in the center bypass passage RC. Further, the hydraulic circuit 20 arranges the directional control valves in tandem by arranging a plurality of directional control valves in series in the two center bypass passages RC1, RC2. In the following description, a group composed of a plurality of directional control valves arranged in tandem in the center bypass passage RC is referred to as a “directional control valve group”.
- the hydraulic circuit 20 has a remote control pressure (secondary pressure of the remote control valve) generated according to operation information (for example, information about the operation amount, information about the operation direction) corresponding to the operation of the operator's operation lever. Is input to the directional control valve (Vt1, etc.) corresponding to the operated operating lever. At this time, the direction control valve switches the position of the spool and changes the area of the opening of the spool in accordance with the remote control pressure introduced at both ends of the spool (flow rate control spool).
- the directional control valve allows the flow rate (operation amount) of the pressure oil (hydraulic oil) supplied from the center bypass passage RC to the hydraulic actuator (for example, the cylinder port Cprt in FIGS. 3A to 3C) through the opening of the spool, and The direction (operation direction) can be controlled.
- the hydraulic circuit 20 uses the bleed-off valve Vbo (for example, Vbo1) disposed downstream of the center bypass passage RC (for example, RC1), and the pressure oil discharged from the hydraulic pump P (for example, P1). Part (surplus) of the oil is returned to the hydraulic oil tank Tnk (bleed-off control is performed).
- Vbo for example, Vbo1
- the construction machine 100 can control the flow rate of the hydraulic oil (pressure oil) supplied to the hydraulic cylinder (for example, 11c) and control the drive (operation) of the hydraulic actuator (for example, the boom 11 in FIG. 1). it can.
- the bleed-off valve Vbo includes an unload position where the opening area is maximized and a block position where the opening area is zero.
- the bleed-off valve Vbo is switched from the unload position to the block position using the pressure oil of the pilot pump Pp via an electromagnetic proportional pressure reducing valve or the like (not shown) controlled by the control device 30 described later. , Its opening area is changed.
- the bleed-off valve Vbo can return (return) the pressure oil having a desired flow rate corresponding to the changed opening area to the hydraulic oil tank Tnk.
- the hydraulic circuit 20 uses a bypass passage RBp (and a bypass switching valve Vps) disposed on the upstream side of the direction control valve (for example, Vb1 or Va1 in FIG. 2), and uses a hydraulic pump P (P2 or P2). A part of the pressure oil discharged from P1) is directly supplied to a cylinder port (for example, Cprt in FIGS. 3A to 3C). Further, the hydraulic circuit 20 changes the opening area of the bypass switching valve Vps based on information input to the construction machine 100. That is, the hydraulic circuit 20 according to the present embodiment causes the bypass switching valve Vps to function as a load check valve and also functions as a switching valve that directly supplies hydraulic oil (pressure oil) to the hydraulic actuator using the bypass passage RBp.
- a bypass switching valve Vps disposed on the upstream side of the direction control valve (for example, Vb1 or Va1 in FIG. 2), and uses a hydraulic pump P (P2 or P2). A part of the pressure oil discharged from P1) is directly supplied to a
- a direction control valve disposed in the hydraulic circuit 20 of the construction machine 100 according to the embodiment of the present invention will be described with reference to FIGS. 3A to 3C and FIG. 4.
- the hydraulic circuit 20 includes a directional control valve V that controls hydraulic oil (pressure oil) supplied to a hydraulic actuator (hydraulic cylinder), and a pressure oil via a center bypass passage RC. Is supplied from the inlet port PIprt, the outlet port POprt through which the pressure oil supplied to the inlet port PIprt flows out to the center bypass passage RC, the cylinder port Cprt supplying the hydraulic oil to the hydraulic cylinder, and the hydraulic cylinder discharged from the hydraulic cylinder And a tank port Tprt for discharging the pressure oil to the hydraulic oil tank.
- V hydraulic oil supplied to a hydraulic actuator (hydraulic cylinder) supplied to a hydraulic actuator (hydraulic cylinder), and a pressure oil via a center bypass passage RC. Is supplied from the inlet port PIprt, the outlet port POprt through which the pressure oil supplied to the inlet port PIprt flows out to the center bypass passage RC, the cylinder port Cprt supplying the hydraulic oil to the
- the directional control valve V supplies, as the internal passage RV, the first internal passage RV1 through which the supplied pressure oil flows out to the center bypass passage RC, and the supplied pressure oil to the hydraulic actuator. And a second internal passage RV2.
- the hydraulic circuit 20 according to the present embodiment includes a directional control valve group Gv including a plurality of directional control valves V. That is, the plurality of directional control valves V configuring the directional control valve group Gv include the first internal passage RV1 and the second internal passage RV2, respectively.
- the first internal passage RV1 of the direction control valve V is an internal passage (for example, RV1 in FIG. 2) for supplying pressure oil downstream (for example, the bleed-off valve Vbo) of the center bypass passage RC. .
- the first internal passage RV1 flows the pressure oil discharged from the hydraulic pump P into the center bypass passage RC downstream of the direction control valve V. Further, even when the spool position of the direction control valve V is switched, the opening of the first internal passage RV1 is not fully closed. That is, the first internal passage RV1 has substantially the same passage area regardless of the spool position of the direction control valve V.
- the hydraulic circuit 20 according to the embodiment of the present invention can form a parallel passage by the center bypass passage RC and the first internal passage RV1. Moreover, the hydraulic circuit 20 according to the embodiment of the present invention can form a parallel passage corresponding to the passage area of the first internal passage RV1. Furthermore, the hydraulic circuit 20 according to the embodiment of the present invention can supply pressure oil to the directional control valve group Gv (a plurality of directional control valves V) only from the formed parallel passage.
- the traveling direction control valves (for example, Vt1 and Vt2 in FIG. 2) of the plurality of direction control valves V are also configured so that the opening of the first internal passage RV1 is fully closed (for example, RV1t in FIG. 2). Good.
- the construction machine 100 (the hydraulic circuit 20 thereof) can ensure traveling stability (flow rate of hydraulic oil necessary for traveling) during traveling.
- the first internal passage RV1 (the spool thereof) of the directional control valve V according to the present embodiment does not include a gap (hereinafter referred to as “bleed opening”) for returning the pressure oil to the hydraulic oil tank. That is, as described above, the hydraulic circuit 20 according to the present embodiment performs bleed-off control (unified bleed-off control) using the bleed-off valve Vbo disposed on the most downstream side of the center bypass passage RC.
- the second internal passage RV2 of the directional control valve V is an internal passage (for example, RV2 in FIG. 2) for supplying pressure oil to a hydraulic cylinder (for example, the arm cylinder 12c in FIG. 2). is there.
- the second internal passage RV2 supplies the pressure oil discharged from the hydraulic pump P to the hydraulic cylinder.
- the second internal passage RV2 has a flow rate (operating amount) of pressure oil (operating oil) supplied to the hydraulic cylinder when the area of the spool opening of the direction control valve V is changed by the input remote control pressure. The direction (operation direction) is changed.
- the second internal passage RV2 directly uses a bypass passage RBp (and a bypass switching valve Vps) to directly transfer part (or all) of the pressure oil discharged from the hydraulic pump P to the cylinder port Cprt. (Hydraulic cylinder).
- the directional control valve V is in the case of spool displacement (Mb), and when the bypass passage RBp is closed (when the bypass switching valve Vps is closed), Via the second internal passage RV2 and the opening of the spool (f1 in the figure), the pressure oil (hydraulic oil) supplied from the center bypass passage RC is supplied to the cylinder port CprtB (hydraulic cylinder). At this time, the pressure oil (operating oil) discharged from the hydraulic cylinder to the cylinder port CprtA is discharged from the tank port Tprt to the operating oil tank.
- Mb spool displacement
- the directional control valve V is in the case of the spool displacement (Mb), and when the bypass passage RBp is opened (when the bypass switching valve Vps is opened), the bypass passage RBp. (F2 in the figure) and the opening of the spool (f1 in the figure) are supplied to the cylinder port CprtB (hydraulic cylinder) with the pressure oil (hydraulic oil) supplied from the center bypass passage RC.
- the hydraulic oil when the spool position is in the neutral position (when the spool is closed), the hydraulic oil is supplied from the center bypass passage RC via the bypass passage RBp (and the bypass switching valve Vps) only. It may be supplied to the cylinder port Cprt.
- the hydraulic circuit 20 in which the directional control valve group Gv (a plurality of directional control valves V) according to the embodiment of the present invention is arranged forms a parallel passage by the plurality of directional control valves V and the center bypass passage RC.
- the hydraulic circuit 20 has a first internal passage (RV1 in FIGS. 3A to 3C) of the directional control valve V having substantially the same passage area regardless of the spool position of the directional control valve V.
- the pressure oil Op supplied from the inlet port PIprt flows out to the outlet port POprt and flows out to the center bypass passage RC.
- the hydraulic circuit 20 of the construction machine 100 according to the embodiment of the present invention can simplify the shape of the center bypass passage RC. Moreover, since the hydraulic circuit 20 according to the present embodiment can reduce the bent portion of the center bypass passage RC, the pressure loss of the pressure oil passing through the center bypass passage RC can be reduced.
- the directional control valve V since the bleed-off control is not performed by the directional control valve V (because the directional control valve V does not have a bleed opening), the directional control valve V The opening area of the first internal passage RV1 can be increased. That is, according to the hydraulic circuit 20, since the opening area of the first internal passage RV1 of the direction control valve V can be increased, the pressure loss of the pressure oil passing through the center bypass passage RC can be reduced.
- the hydraulic circuit 20 since the plurality of directional control valves V can be arranged in series with the center bypass passage RC, the center bypass passage RC and the plurality of first internal passages RV1 (directions) The passage formed by the control valve V) can function as a parallel passage. For this reason, according to the hydraulic circuit 20, it is not necessary to provide a parallel passage separately, and the direction control valve V can be reduced in size (the size of the spool in the axial direction and the radial direction is reduced). For example, the hydraulic circuit 20 can reduce the size of the bridge passage Rb (FIG. 3A).
- the flow rate of hydraulic oil (pressure oil) supplied to the hydraulic cylinder (11c, etc.) is controlled using the bypass passage RBp (and the bypass switching valve Vps), The drive (operation) of the hydraulic actuator (11 etc.) can be controlled.
- the pressure oil supplied to the hydraulic actuator can be controlled independently of the control of the stroke of the direction control valve V.
- the hydraulic circuit 20 can control the pressure oil supplied to the hydraulic actuator using the bypass switching valve Vps, for example, even after deviating from the upper limit of the stroke control range of the direction control valve V.
- the pressure oil is directly supplied to the hydraulic cylinder (cylinder port Cprt) using the bypass passage RBp (and bypass switching valve Vps) without passing through the opening of the spool of the direction control valve V. Therefore, the pressure loss of the supplied pressure oil can be reduced.
- FIG. 5 shows another example of the hydraulic circuit of the construction machine.
- a bleed opening for example, Sbo in FIG. 6
- Va1, etc. the direction control valve
- pressure loss of the pressure oil that passes through the directional control valve may occur. That is, in construction machines having other hydraulic circuits, the opening degree of the internal passage of the direction control valve is designed to be narrowed even when the opening degree of the bleed opening of the direction control valve is the upper limit. Compared to the case of the hydraulic circuit (FIG. 2), the pressure loss of the pressure oil passing through the center bypass passage may increase.
- the directional control valve of the other hydraulic circuit since the bleed opening is provided in the spool of the directional control valve, the length in the longitudinal direction of the directional control valve increases. That is, in the directional control valve of the other hydraulic circuit, since the bleed opening is provided in the spool of the directional control valve, the directional control valve becomes larger than the hydraulic circuit according to the present invention (FIG. 2), Its production is not easy.
- the controller 30 of the construction machine 100 uses a controller 30C (FIG. 2) that is mounted to control the operation of the entire construction machine 100.
- the controller 30 ⁇ / b> C is a device that instructs each component of the construction machine 100 to operate and controls the operation of each component.
- the controller 30C (control device 30) can be configured by an arithmetic processing device including a CPU (Central Processing Unit), a memory, and the like.
- the controller 30C controls the operation of the regulator R (R1, R2) based on information input to the construction machine 100 (for example, operation information regarding the operation amount and operation direction of the operation lever).
- the discharge amount of the hydraulic pump P (P1, P2) is controlled by the regulator R.
- the controller 30C generates a remote control pressure using a remote control valve or the like based on information input to the construction machine 100.
- the controller 30C inputs the generated remote control pressure to the direction control valve (Vt1 etc.) using the remote control circuit.
- the direction control valve can switch the spool position and control the hydraulic oil supplied to the hydraulic actuator by using the input remote control pressure.
- controller 30C based on information input to the construction machine 100, pilot pilots Pp (Pp1, Pp2) that are input to the bleed-off valves Vbo (Vbo1, Vbo2) via an electromagnetic proportional pressure reducing valve (not shown). Change the pressure oil pressure.
- the bleed-off valve Vbo can change the opening degree using the input pressure.
- the bleed-off valve Vbo can control the flow rate of the pressure oil that returns to the hydraulic oil tank by changing the opening degree.
- the controller 30C controls the opening area of the bypass switching valve Vps (FIGS. 3A to 3C) based on information input to the construction machine 100.
- the controller 30C changes the pressure oil pressure of the pilot pump Pp (Pp1, Pp2 in FIG. 2) input to the control port of the bypass switching valve Vps, for example, to change the opening area of the bypass switching valve Vps.
- Control via (not shown).
- the controller 30C can control the flow rate of the pressure oil flowing through the bypass passage RBp by changing the opening area of the bypass switching valve Vps. That is, the controller 30C can control the pressure oil supplied directly to the cylinder port Cprt.
- the controller 30C changes the opening area of the bypass switching valve Vps when the pressure oil is not supplied to the cylinder port Cprt via the opening of the spool of the direction control valve V, so that the pressure supplied to the cylinder port Cprt is changed.
- the oil may be controlled.
- the configuration and the like (FIGS. 1 to 4) of the construction machine 110 according to the example are basically the same as the configuration and the like of the construction machine 100 of the embodiment, and thus description thereof is omitted.
- FIG. 1 An example of the direction control valve (control valve) arranged in the hydraulic circuit 20 of the construction machine 110 according to the present embodiment is shown in FIG.
- the hydraulic circuit 20 has a plurality of directional control valves V arranged on a plane perpendicular to the center bypass passage RC.
- the hydraulic circuit 20 can arrange the plurality of directional control valves V of the directional control valve group Gv (FIG. 4) arranged in tandem at positions corresponding to the cylinder ports Cprt (hydraulic actuators). That is, the hydraulic circuit 20 can optimally design the shape, length, wiring, and the like of the oil passage (RC, RBp, etc. in FIG. 2).
- the hydraulic circuit 20 has the bypass passages RBp (and the bypass switching valve Vps) arranged in the plurality of directional control valves V arranged in a plane perpendicular to the center bypass passage RC. Thereby, the hydraulic circuit 20 can control the pressure oil supplied to the cylinder port Cprt from the plurality of directional control valves V arranged on a plane perpendicular to the center bypass passage RC.
- the hydraulic circuit that can use the present invention is not limited to a circuit in which two directional control valves V are arranged on the same plane perpendicular to the center bypass passage RC as shown in FIG. That is, in the hydraulic circuit in which the present invention can be used, for example, three or more directional control valves V may be arranged on the same plane perpendicular to the center bypass passage RC.
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Abstract
Description
本発明を用いることができる建設機械100の概略構成を、図1を用いて説明する。ここで、建設機械とは、本実施形態では、油圧アクチュエータ(後述するブーム等)を用いて、所望の作業を実施する機械である。
本発明の実施形態に係る建設機械100の油圧回路20を、図2を用いて説明する。ここで、図2に記載した実線は、油路(圧油の通路)を示す。//を付加している実線は、電気制御系を示す。
本発明の実施形態に係る建設機械100の油圧回路20に配置された方向制御弁を、図3Aから図3C及び図4を用いて説明する。
建設機械100の制御装置30は、本実施形態では、建設機械100全体の動作を制御するために搭載されているコントローラ30C(図2)を用いる。ここで、コントローラ30C(制御装置30)は、建設機械100の各構成に動作を指示し、各構成の動作を制御する装置である。コントローラ30C(制御装置30)は、CPU(Central Processing Unit)及びメモリ等を含む演算処理装置で構成することができる。
実施例に係る建設機械110の構成等(図1~図4)は、実施形態の建設機械100の構成等と基本的に同様のため、説明を省略する。
本実施例に係る建設機械110の油圧回路20に配置された方向制御弁(コントロールバルブ)の一例を図8に示す。
11 : ブーム, 11c : ブームシリンダ
12 : アーム, 12c : アームシリンダ
13 : バケット, 13c : バケットシリンダ
20 : 油圧回路
30 : 制御装置, 30C : コントローラ
Gv : 方向制御弁グループ
V : 方向制御弁(コントロールバルブ)
Va1,Va2,Vb1,Vb2,Vbk,Vsw,Vop,Vt1,Vt2:油圧アクチュエータ用方向制御弁
Vst : 走行直進用方向制御弁(走直弁)
Vbo : ブリードオフ弁(カット弁)
Vps : バイパス切換弁
Vch : チェック弁(逆止弁)
RC,RC1,RC2: センターバイパス通路(センターバイパスライン)
RV1 : 第1の内部通路(ブリードオフ用内部通路,PT開口用内部通路)
RV2 : 第2の内部通路(油圧アクチュエータ用内部通路,シリンダポート用内部通路)
RBp : バイパス通路
PIprt:入口ポート
POprt:出口ポート
Tprt :タンクポート
Cprt,CprtA,CprtB :シリンダポート
P,P1,P2: 油圧ポンプ
R,R1,R2: レギュレータ
Tnk : 作動油タンク(タンク)
Pp,Pp1,Pp2: パイロットポンプ
Claims (6)
- 油圧ポンプから吐出される圧油が供給されるセンターバイパス通路を備える建設機械の油圧回路であって、
前記センターバイパス通路にタンデムに配置された複数の方向制御弁からなる方向制御弁グループと、
前記方向制御弁グループの下流の該センターバイパス通路に配置されたブリードオフ弁と
を有し、
前記方向制御弁は、該方向制御弁に供給された圧油を前記センターバイパス通路に流出する第1の内部通路と、該圧油をシリンダポートに供給する第2の内部通路とを備え、
前記第1の内部通路は、前記油圧ポンプから吐出された圧油を該方向制御弁に対して下流の該センターバイパス通路に流出させることにより、該センターバイパス通路と該第1の内部通路とによってパラレル通路を形成し、
前記第2の内部通路は、スプールの開口及び/又はバイパス通路を経由して、前記センターバイパス通路から前記シリンダポートに圧油を供給する、
ことを特徴とする建設機械の油圧回路。 - 前記バイパス通路は、バイパス切換弁を配置され、
前記バイパス切換弁は、該バイパス切換弁の開口面積を変化させることによって、前記バイパス通路を経由して前記シリンダポートに供給される圧油の流量を制御する、
ことを特徴とする、請求項1に記載の建設機械の油圧回路。 - 前記第1の内部通路は、前記方向制御弁のスプール位置に関わらず略同一の通路面積を有し、該通路面積に対応する前記パラレル通路を形成し、
前記複数の方向制御弁は、前記パラレル通路のみから圧油の供給を受ける、
ことを特徴とする、請求項1に記載の建設機械の油圧回路。 - 複数の前記方向制御弁グループと複数の前記センターバイパス通路とを有し、
複数の前記方向制御弁グループは、複数の前記センターバイパス通路毎に夫々配置され、
複数の前記センターバイパス通路と複数の前記方向制御弁グループの各第1の内部通路とが、夫々パラレル通路を形成する、
ことを特徴とする、請求項1に記載の建設機械の油圧回路。 - 請求項1に記載の建設機械の油圧回路を制御する建設機械の油圧回路の制御装置。
- 請求項2に記載の建設機械の油圧回路を制御する建設機械の油圧回路の制御装置であって、
前記建設機械に入力された操作情報に応じて、前記バイパス切換弁の開口面積を変更する、ことを特徴とする、建設機械の油圧回路の制御装置。
Priority Applications (4)
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EP13827990.6A EP2884117B1 (en) | 2012-08-07 | 2013-04-11 | Hydraulic circuit for construction machine and control device for same |
KR1020147028306A KR101642900B1 (ko) | 2012-08-07 | 2013-04-11 | 건설기계의 유압회로 및 그 제어장치 |
CN201380020039.3A CN104220762B (zh) | 2012-08-07 | 2013-04-11 | 施工机械的液压回路及其控制装置 |
US14/540,226 US9657461B2 (en) | 2012-08-07 | 2014-11-13 | Hydraulic circuit for construction machine and control device for same |
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JP2012175170A JP5978056B2 (ja) | 2012-08-07 | 2012-08-07 | 建設機械の油圧回路及びその制御装置 |
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JP6514522B2 (ja) * | 2015-02-24 | 2019-05-15 | 川崎重工業株式会社 | アンロード弁および油圧ショベルの油圧駆動システム |
JP6304273B2 (ja) * | 2016-02-05 | 2018-04-04 | コベルコ建機株式会社 | 作業機械の油圧駆動装置 |
EP3225583B1 (en) * | 2016-03-31 | 2019-02-13 | Cargotec Research & Development Ireland Limited | A sectional hydraulic valve and a truck mounted forklift incorporating such a valve |
KR102357613B1 (ko) | 2016-07-29 | 2022-01-28 | 스미토모 겐키 가부시키가이샤 | 쇼벨, 쇼벨용 컨트롤밸브 |
JP7297596B2 (ja) * | 2019-08-23 | 2023-06-26 | 川崎重工業株式会社 | 建設機械の油圧システム |
WO2023018125A1 (ko) * | 2021-08-10 | 2023-02-16 | 현대두산인프라코어(주) | 유압 시스템 |
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Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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US9657461B2 (en) | 2017-05-23 |
US20150068200A1 (en) | 2015-03-12 |
KR101642900B1 (ko) | 2016-07-26 |
KR20140138268A (ko) | 2014-12-03 |
EP2884117B1 (en) | 2016-11-23 |
JP2014034990A (ja) | 2014-02-24 |
CN104220762B (zh) | 2016-08-17 |
JP5978056B2 (ja) | 2016-08-24 |
EP2884117A1 (en) | 2015-06-17 |
CN104220762A (zh) | 2014-12-17 |
EP2884117A4 (en) | 2015-09-09 |
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