WO2015025713A1 - 建設機械の多連方向切換弁 - Google Patents

建設機械の多連方向切換弁 Download PDF

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Publication number
WO2015025713A1
WO2015025713A1 PCT/JP2014/070728 JP2014070728W WO2015025713A1 WO 2015025713 A1 WO2015025713 A1 WO 2015025713A1 JP 2014070728 W JP2014070728 W JP 2014070728W WO 2015025713 A1 WO2015025713 A1 WO 2015025713A1
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WO
WIPO (PCT)
Prior art keywords
valve
direction switching
pump
pilot
switching valve
Prior art date
Application number
PCT/JP2014/070728
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
泰輔 岡田
Original Assignee
ナブテスコ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ナブテスコ株式会社 filed Critical ナブテスコ株式会社
Priority to KR1020167006953A priority Critical patent/KR101783566B1/ko
Priority to EP14837856.5A priority patent/EP3037676B1/en
Priority to CN201480046270.4A priority patent/CN105492779B/zh
Publication of WO2015025713A1 publication Critical patent/WO2015025713A1/ja

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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
    • 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
    • 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
    • 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
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • 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
    • 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
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • 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 multiple direction switching valve for moving a plurality of hydraulic actuators attached to a construction machine such as a hydraulic excavator.
  • a signal that the arm direction switching valve 8a is operated is sent as a signal to the boom speed increasing direction switching valve 14a. It is conceivable that the boom speed increasing direction switching valve 14a is returned to its neutral position by being inserted from the outside (outside the multiple direction switching valve). However, this method has a problem that external piping is additionally required.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to stop the acceleration of the first actuator when the second actuator is operated without adding external piping. It is to provide a multiple directional control valve.
  • the present invention includes a first circuit in which a first directional switching valve is disposed and pressure oil is supplied from a first pump, and a second circuit in which a second directional switching valve is disposed and pressure oil is supplied from a second pump.
  • a multiple direction switching valve for a construction machine formed in the valve body block wherein the first direction switching valve is a valve for controlling supply and discharge of pressure oil from the first pump to the first actuator.
  • the second direction switching valve is a valve that controls supply and discharge of pressure oil from the second pump to the second actuator.
  • a first actuator speed increasing valve having a speed increasing position for supplying pressure oil from the second pump to the first actuator and a neutral position for not supplying pressure oil from the second pump to the first actuator;
  • a first actuator acceleration release mechanism that is disposed in the valve block and switches the first actuator acceleration valve from the acceleration position to the neutral position when the second direction switching valve is operated; It is provided in the body block.
  • the present invention also includes a first circuit in which a first direction switching valve is arranged and pressure oil is supplied from the first pump, and a second circuit in which a second direction switching valve is arranged and pressure oil is supplied from the second pump.
  • a circuit and a third circuit in which a third direction switching valve is disposed and pressure oil is supplied from a third pump is a multiple direction switching valve for a construction machine formed in a valve body block,
  • the one-way switching valve is a valve that controls the supply and discharge of pressure oil from the first pump to the first actuator
  • the second direction switching valve is the supply of pressure oil from the second pump to the second actuator.
  • the third direction switching valve is a valve that controls supply and discharge of pressure oil from the third pump to the third actuator.
  • a first actuator that switches the flow of pressure oil from the third pump to the first actuator to the flow of pressure oil from the third pump to the second actuator when the second direction switching valve is operated.
  • An acceleration release mechanism is provided in the valve body block.
  • the above-mentioned two inventions have the unity of the invention in that a first actuator speed increasing release mechanism that operates when the second direction switching valve is operated is provided in the valve body block.
  • the acceleration of the first actuator can be stopped when the second actuator is operated without adding external piping.
  • FIG. 1 is a hydraulic circuit diagram illustrating a multiple direction switching valve according to a first embodiment of the present invention. It is a hydraulic circuit diagram which shows the modification of the multiple direction switching valve shown in FIG. It is a hydraulic circuit diagram which shows the multiple direction switching valve which concerns on 2nd Embodiment of this invention.
  • FIG. 4 is a hydraulic circuit diagram showing a modification of the multiple direction switching valve shown in FIG. 3.
  • the hydraulic excavator to which the multiple direction switching valve 101 is applied includes three pumps (hydraulic pumps) 51, 52, and 53. These three pumps 51, 52, and 53 are driven by, for example, an engine (not shown).
  • the hydraulic excavator includes hydraulic actuators such as two traveling hydraulic motors 54 and 57, a boom hydraulic cylinder 55, a bucket hydraulic cylinder 56, an arm hydraulic cylinder 59, a turning hydraulic motor 60, and a dozer hydraulic cylinder 61. Can be installed where needed.
  • An optional actuator 58 (service) may be attached to the excavator.
  • the left traveling hydraulic motor 54, the boom hydraulic cylinder 55, and the bucket hydraulic cylinder 56 are respectively a left traveling direction switching valve 1x, a boom direction switching valve 1y, and a boom direction switching valve 1y, which are arranged in the first circuit A, respectively.
  • This is a first actuator whose operation is controlled by the bucket direction switching valve 1z.
  • Each of these directional control valves is a hydraulic pilot type spool valve and is sometimes called a control valve (the same applies to other directional control valves described later).
  • Pressure oil is mainly supplied from the first pump 51 to each directional control valve (first circuit A) arranged in the first circuit A.
  • Each of the left traveling direction switching valve 1x, the boom direction switching valve 1y, and the bucket direction switching valve 1z is a first direction switching valve.
  • the right traveling hydraulic motor 57, the actuator 58, and the arm hydraulic cylinder 59 are respectively a right traveling direction switching valve 2x, a service direction switching valve 2y, and an arm direction switching valve 2z disposed in the second circuit B.
  • the second actuator whose operation is controlled by. Pressure oil is mainly supplied from the second pump 52 to each direction switching valve (second circuit B) arranged in the second circuit B.
  • the right traveling direction switching valve 2x, the service direction switching valve 2y, and the arm direction switching valve 2z are respectively second direction switching valves.
  • the turning hydraulic motor 60 and the dozer hydraulic cylinder 61 are controlled by the turning direction switching valve 3x and the dozer direction switching valve 3y arranged in the third circuit C, respectively. It is. Pressure oil is supplied from the third pump 53 to the turning direction switching valve 3x (third circuit C). Pressure oil is mainly supplied from the third pump 53 to each direction switching valve (third circuit C) arranged in the third circuit C.
  • Each of the turning direction switching valve 3x and the dozer direction switching valve 3y is a third direction switching valve.
  • Each direction switching valve (1x to 1z, 2x to 2z, 3x to 3y) and each circuit (A, B, C) are provided in the valve body block 10.
  • the boom speed increasing valve 4 is disposed downstream of the arm direction switching valve 2z in the unload passage 32 extending from the second pump 52 to the tank T. In addition, you may arrange
  • the boom speed increasing valve 4 is a three-position hydraulic pilot type spool valve, and has a speed increasing position 4a and a neutral position 4b.
  • the speed increasing position 4a is a position for supplying the pressure oil from the second pump 52 to the cylinder chamber 55a on the boom raising side of the boom hydraulic cylinder 55
  • the neutral position 4b is a position for supplying the pressure oil from the second pump 52 to the boom. This is a position where the hydraulic cylinder 55 is not supplied.
  • the boom speed increasing valve 4 is integrally provided with a sub valve 8.
  • a pilot port 9a (pilot chamber 9a) is disposed on one side of the boom acceleration valve 4, and a pilot port 9b (pilot chamber 9b) is disposed on the other side (on the sub valve 8 side).
  • the boom speed increasing valve 4 When the pilot pressure is not introduced into any of the pilot ports 9a and 9b, the boom speed increasing valve 4 is in the neutral position 4b.
  • pilot pressure When pilot pressure is introduced into the pilot port 9a, the position is switched to the acceleration position 4a.
  • the boom acceleration valve 4 When the pilot pressure is introduced into the pilot port 9b in a state where the pilot pressure is introduced into the pilot port 9a, the boom acceleration valve 4 is switched. Returns from the acceleration position 4a to the neutral position 4b.
  • a boom raising pilot line 25 to which a boom operation signal (pilot pressure) for raising the boom is introduced is connected to the pilot port 9a of the boom speed increasing valve 4.
  • a merging valve 5 that supplies pressure oil from the third pump 53 to the first direction switching valve and / or the second direction switching valve is provided.
  • the merging valve 5 is a three-position hydraulic pilot type spool valve, and has a neutral position 5a, an arm merging position 5b (arm and service merging position), and a running position 5c (running independent position).
  • the first and second pilot ports 10a and 10b are arranged on one side of the merging valve 5, and the spring 10c is arranged on the other side.
  • the merging valve 5 When the pilot pressure is not introduced into any of the first to second pilot ports 10a and 10b, the merging valve 5 is in the neutral position 5a by the elastic force of the spring 10c.
  • the joining valve 5 When the pilot pressure is introduced into the first pilot port 10a, the joining valve 5 is switched to the arm joining position 5b, and when the pilot pressure is introduced into the second pilot port 10b, the joining valve 5 is switched to the traveling position 5c.
  • a boom lowering pilot line 26 to which a boom operation signal (pilot pressure) for lowering the boom is introduced is connected to the first pilot port 10a of the junction valve 5.
  • a pilot line 21 (travel independent signal pilot passage) for travel independent signal (pilot pressure) connected to the pilot pump 62 is connected to the second pilot port 10 b of the junction valve 5.
  • pilot line 22 (pilot passage) is connected to the pilot pump 62 in a form branched from the pilot line 21.
  • a side bypass line 24 is connected to the pilot line 21 downstream of the branch position of the pilot line 22 from the pilot line 21.
  • the pilot line 21 and the pilot line 22 are provided with a stop 21a and a stop 22a, respectively.
  • the pilot line 22 passes through the sub valve 8 linked to the boom speed increasing valve 4 and the sub valves 7z and 7y linked to the arm / service direction switching valves 2z and 2y in this order. Is connected to a drain line 27 communicating with.
  • the side bypass line 24 passes through the sub-valves 7x, 6x, 6y, and 6z that are linked to the directional control valves 2x, 1x, 1y, and 1z for right running, left running, boom, and bucket, respectively, in this order.
  • On the downstream side it is connected to a drain line 27 communicating with the tank T.
  • the boom accelerating valve 4 and the sub-valves 8, 7x, 6x of the directional switching valves 2x, 1x for right traveling and left traveling are respectively positioned at the boom accelerating valve 4 and the directional switching valves 2x, 1x.
  • the sub valve 7z, 7y, 6y, 6z of the directional switching valves 2z, 2y, 1y, and 1z for the arm, service, boom, and bucket use the directional switching valves 2z, 2y, 1y and 1z are configured to be opened at the neutral position and closed at the operating position.
  • the boom acceleration release mechanism includes a sub-valve 7z interlocked with the arm direction switching valve 2z, a pilot line 22 connected to the pilot pump 62, and the boom acceleration valve 4 (boom) on the upstream side of the sub-valve 7z of the pilot line 22. It is composed of a speed increase cancellation signal line 23 (speed increase cancellation signal passage) connected to the pilot port 9b of the sub valve 8) interlocked with the speed increase valve 4.
  • the portion to which the speed increasing pressure oil is supplied from the second pump 52 is the supply / discharge passage 34 outside the valve body block 10 with respect to the boom hydraulic cylinder 55, but the second pump The portion to which the speed increasing pressure oil from 52 is supplied may not be the supply / discharge passage 34 (the same applies to modified examples and other embodiments described later).
  • the location where the speed increasing pressure oil from the second pump 52 is supplied is upstream of the boom direction switching valve 1 y in the unload passage 31 of the first pump 51, and the first pump 51. It may be an unload passage 31 portion through which pressure oil flows from the boom hydraulic cylinder 55 to the boom hydraulic cylinder 55.
  • the portion to which the speed increasing pressure oil is supplied from the second pump 52 may be the supply / discharge passage 35 in the valve element block 10 with respect to the boom hydraulic cylinder 55.
  • the speed increasing passage 33 can be formed only in the valve body block 10. By forming the speed increasing passage 33 only in the valve body block 10, external piping can be reduced (the same applies to modified examples and other embodiments described later).
  • the pressure oil from the second pump 52 is not supplied to the boom hydraulic cylinder 55, and the boom hydraulic cylinder 55 operates with the pressure oil from the first pump 51 (boom speed increase stop).
  • the arm hydraulic cylinder 59 is operated by the pressure oil from the second pump 52 and the third pump 53.
  • the boom acceleration canceling mechanism is configured in the valve body block 10, so that the arm hydraulic cylinder 59 is not added without adding external piping.
  • the (second actuator) is operated, the speed increase of the boom hydraulic cylinder 55 (first actuator) can be stopped.
  • the first actuator acceleration release mechanism of the multiple direction switching valve of the present invention may be a bucket acceleration release mechanism instead of the boom acceleration release mechanism shown in the present embodiment (the modification examples described later and The same applies to other embodiments).
  • the second actuator when the second actuator is operated by the first actuator acceleration release mechanism provided in the valve block without adding external piping, The speed increase can be stopped.
  • the boom acceleration cancellation mechanism (first actuator acceleration cancellation mechanism) of the present embodiment uses the sub valve 7z interlocked with the arm direction switching valve 2z (second direction switching valve) as one component of the mechanism. Used. By using the sub-valve linked to the second direction switching valve, it is easy to generate a speed increase cancellation signal for returning the boom speed increasing valve 4 (first actuator speed increasing valve) from the speed increasing position 4a to the neutral position 4b.
  • the pilot line 22 that is a component of the boom speed increasing / disengaging mechanism (first actuator speed increasing / releasing mechanism) is connected to the traveling independent signal pilot path (pilot line 21) connected to the pilot pump 62. Branched. By diverging the pilot line 22 from the existing pilot line 21, the enlargement of the valve body block 10 can be suppressed.
  • a multiple direction switching valve 102 according to a modification of the first embodiment will be described with reference to FIG.
  • a main difference between the first embodiment shown in FIG. 1 and the modification shown in FIG. 2 is a branching point (upstream end) of the pilot line 22.
  • the configuration (circuit configuration) of the merging valve 5 is slightly different between the first embodiment shown in FIG. 1 and the modification shown in FIG. 2, but the description thereof will be omitted.
  • the functions at the neutral position 5a of the merging valve 5 shown in FIG. 2, the arm merging position 5b (arm and service merging position), and the traveling position 5c (running independent position) are the functions of the merging valve 5 shown in FIG. It is almost the same as the function.
  • the first pilot port 10a of the merging valve 5 in this modification is connected to a pilot line 25 (a merging switching signal pilot passage) for a merging switching signal (pilot pressure) connected to the pilot pump 62.
  • the pilot line 22 (pilot passage) is connected to the pilot pump 62 in a form branched from the pilot line 25.
  • the pilot line 25 is provided with a diaphragm 25a.
  • the boom acceleration cancellation mechanism (first actuator acceleration cancellation mechanism) in this modification is the same as in the first embodiment, the sub valve 7z interlocking with the arm direction switching valve 2z, and the pilot line 22 connected to the pilot pump 62. And an acceleration cancellation signal line 23 (acceleration cancellation signal path) for connecting the upstream side of the sub valve 7z of the pilot line 22 to the pilot port 9b of the boom acceleration valve 4 (sub valve 8 linked to the boom acceleration valve 4); Consists of.
  • the pilot passage is a pilot line that is a component of the boom acceleration release mechanism (first actuator acceleration release mechanism) from the merge switching signal pilot passage (pilot line 25) connected to the pilot pump 62. 22 is branched. By diverging the pilot line 22 from the existing pilot line 25, the enlargement of the valve body block 10 can be suppressed.
  • the multiple direction switching valve 103 of the second embodiment will be described with reference to FIG.
  • the difference between the modification of the first embodiment shown in FIG. 2 and the second embodiment shown in FIG. 3 is the position of the speed increasing valve 4.
  • the speed increasing valve 4 is disposed in the third circuit C in the valve body block 10.
  • the speed increasing valve 4 is arranged on the downstream side of the turning direction switching valve 3x in the unload passage 36 extending from the third pump 53 to the tank T.
  • the speed increasing valve 4 may be arranged in the unload passage 36 upstream of the turning direction switching valve 3x or upstream of the dozer direction switching valve 3y.
  • the speed increasing valve 4 is a three-position hydraulic pilot type spool valve, and has a speed increasing position 4a and a second speed increasing position 4b.
  • the second acceleration position 4b is also a neutral position.
  • the speed increasing position 4 a is a position for supplying pressure oil from the third pump 53 to the cylinder chamber 55 a on the boom raising side of the boom hydraulic cylinder 55
  • the second speed increasing position 4 b is a pressure from the third pump 53. This is the position where oil is supplied to the second actuator (arm hydraulic cylinder 59, actuator 58 (service)) via the merging valve 5.
  • the speed increasing valve 4 is integrally provided with a sub valve 8.
  • a pilot port 9a is disposed on one side of the speed increasing valve 4, and a pilot port 9b (pilot chamber 9b) is disposed on the other side (on the sub valve 8 side).
  • the speed increasing valve 4 When the pilot pressure is not introduced into any of the pilot ports 9a and 9b, the speed increasing valve 4 is in the second speed increasing position 4b.
  • pilot pressure is introduced into the pilot port 9a, the position is switched to the acceleration position 4a.
  • the acceleration valve 4 is The speed increasing position 4a returns to the second speed increasing position 4b.
  • a boom raising pilot line 25 to which a boom operation signal (pilot pressure) for raising the boom is introduced is connected to the pilot port 9a of the speed increasing valve 4.
  • valve body block 10 when the arm direction switching valve 2z (second direction switching valve) is operated, the pressure oil from the third pump 53 to the boom hydraulic cylinder 55 (first actuator). Is provided with a boom speed increasing release mechanism (first actuator speed increasing releasing mechanism) for switching the flow of the flow to the flow of pressure oil from the third pump 53 to the arm hydraulic cylinder 59 (second actuator).
  • the boom acceleration release mechanism increases the acceleration valve 4 when the arm direction switching valve 2z (second direction switching valve) is operated. The position is switched (returned) from the position 4a to the second acceleration position 4b.
  • the boom speed increasing release mechanism includes a sub valve 7z linked to the arm direction switching valve 2z, a pilot line 22 connected to the pilot pump 62, and a speed increasing valve 4 (speed increasing) on the upstream side of the sub valve 7z of the pilot line 22.
  • the speed increasing cancellation signal line 23 (speed increasing cancellation signal passage) connected to the pilot port 9b of the sub valve 8) interlocked with the valve 4 is constituted.
  • the pressure oil from the second pump 52 is not supplied to the boom hydraulic cylinder 55, and the boom hydraulic cylinder 55 operates with the pressure oil from the first pump 51 (boom speed increase stop).
  • the arm hydraulic cylinder 59 is operated by the pressure oil from the second pump 52 and the third pump 53.
  • the boom acceleration canceling mechanism is configured in the valve body block 10, so that the arm hydraulic cylinder 59 is not added without adding external piping.
  • the (second actuator) is operated, the speed increase of the boom hydraulic cylinder 55 (first actuator) can be stopped.
  • the second actuator when the second actuator is operated by the first actuator acceleration release mechanism provided in the valve block without adding external piping, The speed increase can be stopped.
  • the speed increasing valve 4 is arranged in the third circuit C in the valve body block 10. Since other configurations are the same as those of the multiple direction switching valves 101 and 102 of the first embodiment and its modifications, the multiple direction switching valve 103 of the present embodiment is also the same as the multiple direction switching valves 101 and 102. It has the effect of.
  • the pilot line 22 (pilot passage) is connected to the pilot pump 62 in a form branched from the pilot line 25 (joint switching signal pilot passage) connected to the pilot pump 62. ), But, as in the first embodiment, the boom speed increasing release mechanism (first actuator speed increasing) is connected from the pilot line 21 (travel independent signal pilot path, see FIG. 1) connected to the pilot pump 62.
  • the pilot line 22 which is one component of the release mechanism may be branched.
  • a multiple direction switching valve 104 according to a modification of the second embodiment will be described with reference to FIG.
  • the first actuator speed increase release mechanism provided in the valve body block 10 4 is common in that the flow of pressure oil from the third pump 53 to the first actuator is switched to the flow of pressure oil from the third pump 53 to the second actuator.
  • the second embodiment shown in FIG. 3 is different from the modification example shown in FIG. 4 in that a valve dedicated to speed increase is not provided.
  • the merging valve 5 has the function of the speed increasing valve 4 shown in FIG. That is, the merging valve 5 also serves as the speed increasing valve 4 and is a speed increasing and merging valve.
  • the merging valve 5 can also be understood as a speed increasing valve having a merging valve function.
  • the merging valve 5 is a four-position hydraulic pilot type spool valve, and includes an acceleration position 5a, a neutral position 5b, an arm merging position 5c (arm and service merging position), And a position 5d (travel independent position).
  • the first and second pilot ports 10a and 10b are arranged on one side of the merging valve 5, and the pilot port 10d for increasing the first actuator speed is arranged on the other side.
  • the speed increasing position 5a is a position for supplying the pressure oil from the third pump 53 to the cylinder chamber 55a on the boom raising side of the boom hydraulic cylinder 55
  • the arm joining position 5c is the pressure oil from the third pump 53. This is the position to be supplied to the second actuator (arm hydraulic cylinder 59, actuator 58 (service)).
  • the arm joining position 5c is the second acceleration position of the acceleration valve 4 in the second embodiment. That is, the arm joining position 5c corresponds to the second acceleration position of the acceleration valve 4 in the second embodiment.
  • the merging valve 5 When the pilot pressure is not introduced into any of the pilot ports 10a, 10b, and 10d, the merging valve 5 is in the neutral position 5b. When pilot pressure is introduced into the pilot port 10d, the position is switched to the acceleration position 5a. When the pilot pressure is introduced into the first pilot port 10a in a state where the pilot pressure is introduced into the pilot port 10d, the merging valve 5 Switches from the acceleration position 5a to the arm joining position 5c.
  • the merging valve 5 If pilot pressure is introduced into the first pilot port 10a in a state where pilot pressure is not introduced into the pilot port 10d, the merging valve 5 is switched from the neutral position 5b to the arm merging position 5c. Further, when the pilot pressure is introduced to the second pilot port 10b, the merging valve 5 is switched to the traveling position 5d.
  • a boom raising pilot line 25 to which a boom operation signal (pilot pressure) for raising the boom is introduced is connected to the pilot port 10d of the junction valve 5.
  • the boom acceleration cancellation mechanism (first actuator acceleration cancellation mechanism) is operated when the arm direction switching valve 2z (second direction switching valve) is operated while the boom raising operation is performed. Then, the merging valve 5 is switched from the acceleration position 5a to the arm merging position 5c.
  • one configuration of the boom acceleration release mechanism (first actuator acceleration release mechanism) from the pilot line 21 connected to the pilot pump 62 (running independent signal pilot passage, see FIG. 1).
  • the pilot line 22 as an element may be branched.
  • the pressure oil from the third pump 53 is not supplied to the boom hydraulic cylinder 55, and the boom hydraulic cylinder 55 operates with the pressure oil from the first pump 51 (boom speed increase stop).
  • the arm hydraulic cylinder 59 operates with pressure oil from the second pump 52 and the third pump 53.
  • valve body block 10 can be further prevented from being enlarged by using the valve having both the speed increasing valve function and the merging valve function. .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
PCT/JP2014/070728 2013-08-20 2014-08-06 建設機械の多連方向切換弁 WO2015025713A1 (ja)

Priority Applications (3)

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KR1020167006953A KR101783566B1 (ko) 2013-08-20 2014-08-06 건설 기계의 다연 방향 전환 밸브
EP14837856.5A EP3037676B1 (en) 2013-08-20 2014-08-06 Multidirectional switching valve for construction machine
CN201480046270.4A CN105492779B (zh) 2013-08-20 2014-08-06 建筑机械的多联换向阀

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JP2013-170695 2013-08-20
JP2013170695A JP6196499B2 (ja) 2013-08-20 2013-08-20 建設機械の多連方向切換弁

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US11591775B2 (en) * 2019-03-19 2023-02-28 Yanmar Power Technology Co., Ltd. Hydraulic circuit for construction machine, and hydraulic circuit

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JP6873726B2 (ja) * 2017-02-09 2021-05-19 ナブテスコ株式会社 油圧システム
JP6869829B2 (ja) * 2017-06-29 2021-05-12 株式会社クボタ 作業機の油圧システム
JP7001554B2 (ja) * 2018-06-27 2022-01-19 ヤンマーパワーテクノロジー株式会社 クレーン機能付き油圧ショベル
CN108757651A (zh) * 2018-08-20 2018-11-06 杭叉集团股份有限公司 电动叉车及其液压控制系统
JP7373406B2 (ja) * 2020-01-08 2023-11-02 ナブテスコ株式会社 油圧回路および建設機械
JP2024008539A (ja) * 2022-07-08 2024-01-19 株式会社小松製作所 油圧バルブ装置

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CN105492779A (zh) 2016-04-13
JP6196499B2 (ja) 2017-09-13
KR20160043106A (ko) 2016-04-20
CN105492779B (zh) 2017-06-09
EP3037676A4 (en) 2017-04-26
EP3037676A1 (en) 2016-06-29
JP2015040575A (ja) 2015-03-02
KR101783566B1 (ko) 2017-09-29
EP3037676B1 (en) 2019-02-27

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