WO2013187091A1 - 建設機械の油圧回路 - Google Patents
建設機械の油圧回路 Download PDFInfo
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- WO2013187091A1 WO2013187091A1 PCT/JP2013/056194 JP2013056194W WO2013187091A1 WO 2013187091 A1 WO2013187091 A1 WO 2013187091A1 JP 2013056194 W JP2013056194 W JP 2013056194W WO 2013187091 A1 WO2013187091 A1 WO 2013187091A1
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- control valve
- passage
- directional control
- construction machine
- bleed
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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
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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
- E02F9/2264—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
- E02F9/2282—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
- E02F9/2278—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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
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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
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
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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
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-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
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
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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
- F15B2211/31582—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 having multiple pressure sources and a single output member
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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
- F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
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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
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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
- F15B2211/78—Control of 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
- F15B2211/781—Control of multiple output members one or more output members having priority
Definitions
- the present invention relates to a hydraulic circuit of a construction machine.
- 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.
- Patent Document 1 JP-A-11-257302
- an embodiment of the present invention is a hydraulic circuit of a construction machine that includes a center bypass passage to which pressure oil discharged from a hydraulic pump is supplied and performs bleed-off control, and passes through the center bypass passage. It is an object of the present invention to provide a hydraulic circuit for a construction machine that can reduce the pressure loss of pressure oil.
- a hydraulic circuit for a construction machine including a plurality of directional control valves arranged in tandem in a center bypass passage of the construction machine, and the directional control valve group.
- a bleed-off valve disposed in the downstream center bypass passage, and the direction control valve includes a first internal passage that discharges pressure oil supplied to the direction control valve to the center bypass passage;
- a parallel passage is formed by the center bypass passage and the first internal passage, and the bleed-off valve is connected to the bleed-off valve.
- the pressure loss of the pressure oil passing through the center bypass passage 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 hydraulic circuit diagram explaining the other example of the hydraulic circuit of a construction machine. It is a schematic block diagram explaining an example of the direction control valve of the hydraulic circuit which concerns on the Example of this invention. It is a schematic sectional drawing explaining an example of the cross section (AA cross section of FIG. 4) of the direction control valve of the hydraulic circuit which concerns on the Example of this invention. It is a schematic block diagram explaining the other example of the direction control valve of a hydraulic circuit. It is a schematic sectional drawing explaining an example of the cross section (BB cross section of FIG. 6) of the other example of the direction control valve of a hydraulic circuit.
- 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.). As long as it is refluxed (bleed-off control), any of them can be used.
- 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 in the present embodiment.
- 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 is controlled by a boom direction control valve (for example, Vb1 and Vb2 in FIG. 2 (described later)) that is controlled according to an operation amount (and an operation direction) of an operation lever of an operator (operator, operator).
- the hydraulic oil supplied to the boom cylinder 11c is controlled.
- 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) to form an arm cylinder 12c and a bucket cylinder 13c.
- the hydraulic fluid supplied to the 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).
- the hydraulic circuit 20 of the construction machine 100 will be described with reference to FIG.
- the solid line described in FIG. 2 indicates an oil passage (pressure oil passage).
- a solid line added with // 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.
- the hydraulic circuit to which the present invention can be applied is not limited to one having 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 (a first bleed-off valve Vbo1 and a second bleed-off valve Vbo2) disposed downstream (for example, the most downstream) of the center bypass passage RC. Further, the hydraulic circuit 20 generates a pressure to be input to the pilot port (control port) of the bleed-off valve Vbo (discharges the pressure oil) pilot pump Pp (first pilot pump Pp1 and second pilot pump Pp2).
- a bleed-off valve Vbo a first bleed-off valve Vbo1 and a second bleed-off valve Vbo2 disposed downstream (for example, the most downstream) of the center bypass passage RC. Further, the hydraulic circuit 20 generates a pressure to be input to the pilot port (control port) of the bleed-off valve Vbo (discharges the pressure oil) pilot pump Pp (first pilot pump Pp1 and second pilot pump Pp2).
- 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 includes a first traveling direction control valve (for example, a left traveling direction control valve) Vt1 and a preliminary direction in a first center bypass passage RC1 corresponding to the first hydraulic pump P1.
- the control valve Vop, the turning direction control valve Vsw, the second boom direction control valve Vb2, the first arm direction control valve Va1, and the first bleed-off valve Vbo1 are arranged in series.
- 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.
- 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 in accordance with the remote control pressure introduced at both ends of the spool (flow rate control spool), and the flow rate (operation amount) and direction (operation direction) of the pressure oil (hydraulic oil) To control.
- operation information for example, information about the operation amount, information about the operation direction
- operation information for example, information about the operation amount, information about the operation direction
- the direction control valve switches the position of the spool in accordance with the remote control pressure introduced at both ends of the spool (flow rate control spool), and the flow rate (operation amount) and direction (operation direction) of the pressure oil (hydraulic oil) To control.
- 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). Accordingly, the construction machine 100 can control the flow rate of the hydraulic oil (pressure oil) supplied to the hydraulic cylinder (for example, 11c), and can control the drive (operation) of the hydraulic actuator (for example, 11 in FIG. 1). .
- Vbo for example, Vbo1
- 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 controlled by the control device 30 described later, and 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 includes a directional control valve group (a plurality of directional control valves). Further, the directional control valve according to the present embodiment has, as the internal passage RV, a first internal passage that flows the supplied pressure oil to the center bypass passage RC, and a second that supplies the supplied pressure oil to the hydraulic actuator. And an internal passage. That is, the plurality of directional control valves constituting the directional control valve group are each provided with a first internal passage and a second internal passage.
- the first internal passage causes the pressure oil discharged from the hydraulic pump to flow out to the center bypass passage RC downstream of the direction control valve, whereby a parallel passage is formed by the center bypass passage RC and the first internal passage.
- a parallel passage is formed by the center bypass passage RC and the first internal passage.
- the shape of the internal passage of the direction control valve (the shape of the spool) or the like may be the shape of an embodiment (FIG. 4) described later.
- the first internal passage is an internal passage (for example, RV1 in FIG. 2) for supplying pressure oil to the bleed-off valve Vbo.
- the first internal passage flows the pressure oil discharged from the hydraulic pump P connected upstream of the center bypass passage RC to the center bypass passage RC downstream of the direction control valve (Va1 and the like).
- the opening of the first internal passage is not fully closed even when the spool position of the directional control valve is switched. That is, in the present embodiment, the first internal passage has substantially the same passage area regardless of the spool position of the direction control valve. Note that substantially the same passage area means that the effective passage area through which the pressure oil actually passes does not change substantially compared to the increase / decrease amount of the passage area that changes due to the displacement of the spool position.
- 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. Further, 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. Furthermore, the hydraulic circuit 20 according to the embodiment of the present invention can supply pressure oil to the directional control valve group (a plurality of directional control valves) only from the formed parallel passage.
- the traveling direction control valves (for example, Vt1 and Vt2 in FIG. 2) among the plurality of direction control valves may have a configuration in which the opening of the first internal passage is fully closed (for example, RV1t in FIG. 2).
- 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 (spool) of the directional control valve 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.
- bleed opening a gap
- the hydraulic circuit 20 according to the present embodiment can perform 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 according to the embodiment of the present invention 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).
- the second internal passage supplies pressure oil discharged from the hydraulic pump P to a hydraulic cylinder (such as the arm cylinder 12c in FIG. 2).
- the second internal passage according to the present embodiment changes the path of the internal passage and supplies the hydraulic oil (hydraulic oil) supplied to the hydraulic cylinder. ) Is changed in flow rate (operation amount) and direction (operation direction).
- the direction control valve construction machine 100
- Fig. 3 shows another example of the hydraulic circuit of a construction machine.
- bleed openings for example, Sbo of FIG. 6
- Va1 of FIG. 3, etc. the construction machine including the hydraulic circuit of FIG. 3 can perform bleed-off control by changing the opening area of the bleed opening.
- the pressure loss of the pressure oil passing through the directional control valve may occur. That is, in the construction machine provided with the hydraulic circuit of FIG. 3, even when the opening degree of the bleed opening of the direction control valve is the upper limit, the opening degree of the internal passage of the direction control valve is designed to be narrowed. Compared with the case of the hydraulic circuit according to (FIG. 2), the pressure loss of the pressure oil passing through the center bypass passage may increase.
- the directional control valve of the hydraulic circuit of FIG. 3 since the bleed opening is provided in the spool of the directional control valve, the length of the directional control valve in the longitudinal direction increases. That is, in the directional control valve of the hydraulic circuit of FIG. 3, 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). , Making it uneasy.
- 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.
- the controller 30C changes the pressure oil pressure of the pilot pump Pp (Pp1, Pp2) input to the bleed-off valves Vbo (Vbo1, Vbo2) based on the information input to the construction machine 100.
- 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 discharge from the hydraulic pump P is performed using the first internal passage of the direction control valve without performing the bleed-off control by the direction control valve. Since the compressed pressure oil can be supplied downstream of the center bypass passage RC, the pressure loss of the pressure oil passing through the center bypass passage RC can be reduced.
- the bleed-off control is not performed by the directional control valve using the bleed-off valve Vbo disposed downstream of the center bypass passage RC (each direction The bleed-off control can be performed downstream of the center bypass passage RC (without providing a bleed opening in the control valve).
- the opening area of the internal passage (for example, the first internal passage) of the directional control valve is reduced. Since it can be enlarged, the pressure loss of the pressure oil passing through the center bypass passage RC can be reduced.
- the directional control valve since the directional control valve is not provided with the bleed opening, the size of the directional control valve in the longitudinal direction can be reduced.
- a direction control valve can be reduced in size and the manufacture can be made easy.
- the configuration and the like of the construction machine 100E according to the present 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. 4 shows a schematic configuration diagram of a directional control valve (control valve) arranged in the hydraulic circuit 20 of the construction machine 100E according to the present embodiment.
- the directional control valve V of the hydraulic circuit 20 is supplied from the inlet port PIprt supplied with pressure oil via the center bypass passage RC and the inlet port PIprt.
- Outlet port POprt for flowing the pressurized oil into the center bypass passage RC
- cylinder port Cprt for supplying the pressure oil supplied to the directional control valve V to the hydraulic cylinder, and hydraulic oil discharged from the hydraulic cylinder for the hydraulic oil tank
- a tank port Tprt for discharging to the tank.
- the directional control valve V uses a check valve (check valve) for the pressure oil (working oil) Oc supplied from the center bypass passage RC when the spool is displaced (Mb).
- the valve is supplied from the cylinder port CprtB to the hydraulic cylinder (for example, 11c in FIGS. 1 and 2) via the Vch and the second internal passage RV2.
- the pressure oil (hydraulic oil) Ot discharged from the hydraulic cylinder to the cylinder port CprtA is discharged from the tank port Tprt to the hydraulic oil tank.
- the hydraulic circuit 20 of the construction machine 100E according to the embodiment of the present invention does not perform bleed-off control with the directional control valve V (because the directional control valve V does not have a bleed opening).
- the opening area of the first internal passage RV1 of the direction control valve V can be increased.
- the hydraulic circuit 20 of the construction machine 100E according to the present embodiment can increase the opening area of the first internal passage RV1 of the direction control valve V, the pressure of the pressure oil passing through the center bypass passage RC is increased. Loss can be reduced.
- the hydraulic circuit 20 of the construction machine 100E arranges a plurality of directional control valves V in series with the center bypass passage RC, whereby 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.
- the hydraulic circuit 20 according to the present embodiment does not need to provide a separate parallel passage, and can reduce the size of the direction control valve V (reducing the size of the spool in the axial direction and the radial direction).
- the hydraulic circuit 20 according to the present embodiment can reduce the size of the bridge passage Rb (FIG. 4A), for example.
- the hydraulic circuit 20 of the construction machine 100E flows the pressure oil into the center bypass passage RC using the direction control valve group Gv.
- the hydraulic circuit 20 in which the directional control valve group Gv (a plurality of directional control valves V) is arranged has the same passage area regardless of the spool position of the directional control valve.
- a parallel passage can be formed by one internal passage and the center bypass passage RC.
- the hydraulic circuit 20 flows out the pressure oil Op supplied from the inlet port PIprt to the outlet port POprt via the first internal passage RV1 of the direction control valve V, and flows out to the center bypass passage RC.
- the hydraulic circuit 20 of the construction machine 100E according to the embodiment of the present invention does not need to provide a plurality of bleed openings in the spools of the plurality of directional control valves V (directional control valve group Gv).
- the shape of RC can be simplified.
- 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 center bypass passage RC and the first internal passage RV1 are arranged by arranging the plurality of directional control valves V in series with the center bypass passage RC.
- a passage formed by the (direction control valve V) can function as a parallel passage.
- the direction control valve V can be reduced in size.
- the hydraulic circuit 20 of the construction machine 100E according to the embodiment of the present invention has advantageous effects with respect to downsizing, manufacturing ease, and cost reduction of the entire construction machine 100E.
Abstract
Description
添付の図面を参照しながら、本発明の限定的でない例示の実施形態について説明する。なお、添付の全図面の中の記載で、同一又は対応する部材又は部品には、同一又は対応する参照符号を付し、重複する説明を省略する。また、図面は、部材もしくは部品間の相対比を示すことを目的としない。したがって、具体的な寸法は、以下の限定的でない実施形態に照らし、当業者により決定することができる。
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。また、//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の内部通路RVを、下記に説明する。
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。
本実施例に係る建設機械100Eの構成等は、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100E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)の概略構成図を図4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 : 制御手段
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)
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)
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)
- 建設機械の油圧回路であって、
前記建設機械の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、前記圧油を前記建設機械の油圧アクチュエータに供給する第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、
前記ブリードオフ弁は、該ブリードオフ弁の開口面積を変化させることによって、前記パラレル通路を介して供給される圧油をブリードオフ制御する、
ことを特徴とする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。 - 前記方向制御弁グループは、走行用方向制御弁と前記ブリードオフ弁との間の前記センターバイパス通路に配置されている、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。
- 前記ブリードオフ弁は、前記開口面積が最大となるアンロード位置と、該開口面積がゼロとなるブロック位置とを備え、前記アンロード位置から前記ブロック位置へと切り換えることによってブリードオフ制御する、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。
- 前記ブリードオフ弁は、前記建設機械に入力される操作情報に応じて、前記開口面積を変化する、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。
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KR1020167022610A KR101893072B1 (ko) | 2012-06-15 | 2013-03-06 | 건설기계의 유압회로 |
EP17162921.5A EP3203086B1 (en) | 2012-06-15 | 2013-03-06 | Hydraulic circuit for construction machine |
KR1020147028303A KR101653364B1 (ko) | 2012-06-15 | 2013-03-06 | 건설기계의 유압회로 |
EP13804191.8A EP2863066B1 (en) | 2012-06-15 | 2013-03-06 | Hydraulic circuit for construction maschine |
CN201380020041.0A CN104246234B (zh) | 2012-06-15 | 2013-03-06 | 施工机械的液压回路 |
US14/536,776 US9903097B2 (en) | 2012-06-15 | 2014-11-10 | Hydraulic circuit for construction machine |
US15/686,369 US10443213B2 (en) | 2012-06-15 | 2017-08-25 | Hydraulic circuit for construction machine |
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JP2012136351A JP5758348B2 (ja) | 2012-06-15 | 2012-06-15 | 建設機械の油圧回路 |
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US14/536,776 Continuation US9903097B2 (en) | 2012-06-15 | 2014-11-10 | Hydraulic circuit for construction machine |
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JP5758348B2 (ja) | 2015-08-05 |
KR20160103152A (ko) | 2016-08-31 |
US10443213B2 (en) | 2019-10-15 |
JP2014001768A (ja) | 2014-01-09 |
EP2863066A4 (en) | 2015-12-02 |
US9903097B2 (en) | 2018-02-27 |
US20180002897A1 (en) | 2018-01-04 |
EP3203086B1 (en) | 2018-12-05 |
EP2863066B1 (en) | 2017-05-31 |
US20150059332A1 (en) | 2015-03-05 |
KR101653364B1 (ko) | 2016-09-02 |
CN107587548B (zh) | 2021-03-30 |
CN107587548A (zh) | 2018-01-16 |
CN104246234B (zh) | 2017-09-29 |
KR20140138265A (ko) | 2014-12-03 |
EP2863066A1 (en) | 2015-04-22 |
CN104246234A (zh) | 2014-12-24 |
EP3203086A1 (en) | 2017-08-09 |
KR101893072B1 (ko) | 2018-08-29 |
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