WO2011027791A1 - 油圧作業機の油圧駆動装置 - Google Patents
油圧作業機の油圧駆動装置 Download PDFInfo
- Publication number
- WO2011027791A1 WO2011027791A1 PCT/JP2010/064951 JP2010064951W WO2011027791A1 WO 2011027791 A1 WO2011027791 A1 WO 2011027791A1 JP 2010064951 W JP2010064951 W JP 2010064951W WO 2011027791 A1 WO2011027791 A1 WO 2011027791A1
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- WIPO (PCT)
- Prior art keywords
- control valve
- hydraulic
- boom
- direction control
- working element
- Prior art date
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Classifications
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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
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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
-
- 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
-
- 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
-
- 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
-
- 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/31—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
-
- 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
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7058—Rotary 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
- F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
Definitions
- the present invention relates to a hydraulic drive device for a hydraulic working machine that is provided in a hydraulic working machine such as a hydraulic excavator and includes a jack-up switching valve that generates a strong pressing force on a working element such as a boom.
- Patent Document 1 There is a technique disclosed in Patent Document 1 as this type of prior art.
- This prior art is provided in a hydraulic working machine such as a hydraulic excavator, and is capable of raising and lowering working elements such as a first hydraulic pump and a second hydraulic pump that discharge pressure oil that drives a boom, and the first of these.
- a double-acting hydraulic cylinder that is, a boom cylinder, is operated by pressure oil discharged from the hydraulic pump and the second hydraulic pump and drives the boom.
- the first working element directional control valve for controlling the flow of pressure oil supplied from the first hydraulic pump to the bottom chamber and the rod chamber of the boom cylinder, that is, the first boom directional control valve and the second hydraulic pump.
- a second working element direction control valve for controlling the flow of pressure oil supplied to the bottom chamber and rod chamber of the boom cylinder, that is, a second boom direction control valve, a first boom direction control valve and a second boom
- An operating device for switching the direction control valve and a jack-up switching valve that is switched when the pressure in the bottom chamber of the boom cylinder reaches a predetermined pressure are provided.
- the operation is performed in accordance with the switching of the jackup switching valve, and the pressure oil of the first hydraulic pump is supplied to the first boom direction control valve.
- a center bypass switching valve that closes the center bypass passage downstream of the first boom direction control valve.
- the flow control valve causes the pressure oil of the first hydraulic pump to flow.
- the first boom direction control valve is switched to enable supply, and the jack-up switching valve is switched to close the center bypass passage.
- Pressure oil discharged from the first hydraulic pump by the cooperation of the flow control valve and the center bypass switching valve is supplied to the rod chamber of the boom cylinder via the flow control valve and the first boom direction control valve, and A strong pressing force such as a jack-up force can be generated on the boom.
- the above-described conventional technology can supply pressure oil to the rod chamber of the boom cylinder by switching the jack-up switching valve, and generate a strong pressing force such as a jack-up force.
- a strong pressing force such as a jack-up force
- the flow control valve and the center bypass switching valve are switched together in accordance with the switching of the jack-up switching valve, and these flow control valve and the center bypass switching valve are allowed to cooperate with each other.
- the center bypass switching valve may be switched with a slight time delay. In such a case, a response delay occurs in the jackup operation, and the operator who performs the jackup operation It is easy to give an uncomfortable feeling.
- the present invention has been made in accordance with the above-described prior art, and an object of the present invention is to provide a jack without providing a flow rate control valve and a center bypass switching valve that enable supply of pressure oil to the directional control valve for the working element.
- An object of the present invention is to provide a hydraulic drive device for a hydraulic working machine capable of realizing an up operation.
- a hydraulic drive device for a hydraulic working machine includes a first hydraulic pump and a second hydraulic pump that discharge pressure oil that drives a working element capable of raising and lowering, and the first hydraulic pump. Actuated by pressure oil discharged from the first hydraulic pump and the second hydraulic pump, the double-acting hydraulic cylinder that drives the work element, and the first hydraulic pump is supplied to the bottom chamber and the rod chamber of the hydraulic cylinder.
- a directional control valve an operating device for switching between the first working element directional control valve and the second working element directional control valve, and the pressure in the bottom chamber of the hydraulic cylinder has reached a predetermined pressure.
- a hydraulic drive device for a hydraulic working machine having a jack-up switching valve that is switched to, a flow of pressure oil supplied to the bottom chamber and the rod chamber of the hydraulic cylinder is controlled and switched by operation of the operating device.
- a third hydraulic pump for supplying pressure oil to the third working element directional control valve, wherein the jack-up switching valve has a pressure in the bottom chamber of the hydraulic cylinder.
- the directional control valve for the second working element and the directional control valve for the third working element are held neutral, and the directional control valve for the first working element is operated by operating the operating device.
- the direction control for the second work element by the operation of the operating device is performed.
- the second hydraulic pump and the pressure oil discharged from the third hydraulic pump are held so as to be able to be supplied to the rod chamber of the hydraulic cylinder. 2 switching positions.
- the jack-up switching valve is held in the first switching position.
- the oil in the bottom chamber of the hydraulic cylinder can be discharged and the lowering operation in the air can be performed.
- the jack-up switching valve is switched to the second switching position.
- the second working element direction control valve and the third working element direction control valve are switched by operation of the operating device, and the pressure oil discharged from the second hydraulic pump passes through the second working element direction control valve. Is supplied to the rod chambers of the hydraulic cylinders, and the pressure oil discharged from the third hydraulic pump is supplied to the rod chambers of the hydraulic cylinders via the third working element direction control valve.
- the jack-up operation that strongly presses the work element against the ground surface can be performed by the pressure oil supplied to.
- the second working element direction control valve and the third By switching the work element direction control valve, the pressure oil of the second hydraulic pump and the third hydraulic pump can be supplied to the rod chamber of the hydraulic cylinder to perform the jack-up operation. That is, a flow rate control valve that enables supply of pressure oil to the first to third work element direction control valves, and a center disposed downstream of the center bypass passage of the first to third work element direction control valves.
- the jack-up operation can be realized by the switching operation of the second working element direction control valve and the third working element direction control valve without providing the bypass switching valve.
- the hydraulic drive device for a hydraulic working machine is the above-described invention, wherein the right driving motor and the left driving motor that drive the corresponding crawler belt of the pair of crawler belts, and the pressure supplied to the right traveling motor, respectively.
- a directional control valve for traveling right that controls the flow of oil
- a directional control valve for traveling left that controls the flow of pressure oil supplied to the traveling left motor
- the directional control valve for the second work element One of the traveling right direction control valve and the traveling left direction control valve is connected in parallel to the second hydraulic pump.
- the pressure oil of the first hydraulic pump is changed to the traveling right direction control valve by switching between the traveling right direction control valve and the traveling left direction control valve.
- the pressure oil of the second hydraulic pump is supplied to the traveling left direction control valve, and the traveling operation is performed.
- the second working element directional control valve and the third working element directional control valve are switched by operation of the operating device.
- a second hydraulic pump is connected in parallel with the traveling right directional control valve to the second hydraulic pump.
- the working element directional control valve can also be supplied with pressure oil from the second hydraulic pump.
- the second hydraulic pump pressure oil is supplied only to the traveling right directional control valve. Supplied. Accordingly, the pressure oil of the third hydraulic pump is supplied to the rod chamber of the hydraulic cylinder via the third working element direction control valve, thereby performing the jack-up operation. In this way, a smooth combined operation of running and jacking up can be performed.
- the first working element direction control valve is configured such that the pressure oil discharged from the bottom chamber of the hydraulic cylinder is supplied to the rod of the hydraulic cylinder. It has a regeneration circuit that can be supplied to the chamber.
- the pressure oil discharged from the bottom chamber of the hydraulic cylinder is the first work element. It is regenerated to the rod chamber of the hydraulic cylinder via the regenerative circuit of the directional control valve for the operation, whereby the work element can be smoothly lowered in the air. Further, since the pressure oil discharged from the bottom chamber of the hydraulic cylinder by the regeneration circuit is supplied to the rod chamber, the pressure oil discharged from the first hydraulic pump is supplied to the hydraulic cylinder in the lowering operation of the working element in the air. There is no need, and it becomes possible to supply the pressure oil discharged from the first hydraulic pump to the other actuators, and a good combined operation can be performed.
- the hydraulic working machine is composed of a hydraulic excavator
- the working element is composed of a boom
- the hydraulic cylinder is composed of a boom cylinder
- the direction control valve, the second work element direction control valve, and the third work element direction control valve are respectively a first boom direction control valve, a second boom direction control valve, and a third boom direction. It consists of a control valve.
- the present invention configured as described above can perform a jack-up operation by a boom lowering operation of a hydraulic excavator.
- a hydraulic drive device for a hydraulic working machine includes a first hydraulic pump, a second hydraulic pump, and a first working element direction that controls a flow of pressure oil discharged from the first hydraulic pump and supplied to a hydraulic cylinder.
- a control valve and a directional control valve for a second working element that controls the flow of pressure oil discharged from the second hydraulic pump and supplied to the hydraulic cylinder, in the bottom chamber and the rod chamber of the hydraulic cylinder
- a third working element direction control valve that controls the flow of the supplied pressure oil and is switched by operation of the operating device; and a third hydraulic pump that supplies pressure oil to the third working element direction control valve.
- the jack-up switching valve when the pressure in the bottom chamber of the hydraulic cylinder is equal to or lower than a predetermined pressure, is accompanied by switching between the second working element direction control valve and the third working element direction control valve by operation of the operating device.
- Second hydraulic port The jack-up switching valve is held at the second switching position since the second switching position for holding the hydraulic oil discharged from the pump and the third hydraulic pump to the rod chamber of the hydraulic cylinder is provided.
- the operation device is operated to switch the direction control valve for the second work element and the direction control valve for the third work element, and the pressure oil of the second hydraulic pump and the third hydraulic pump is supplied to the rod chamber of the hydraulic cylinder.
- FIG. 1 is a side view showing a hydraulic excavator cited as an example of a hydraulic working machine provided with the hydraulic drive device according to the present embodiment.
- the hydraulic excavator provided with the present embodiment is disposed on a traveling body 1 having a pair of crawler belts driven by a traveling right motor 2 and a traveling left motor 3, and an engine.
- a revolving unit 4 having a chamber 4a and the like, and a front work machine 5 attached to the revolving unit 4 are provided.
- the front work machine 5 includes a boom 6 attached to the swing body 4 so as to be rotatable in the vertical direction, an arm 7 attached to the tip of the boom 6 so as to be rotatable in the vertical direction, and a vertical direction at the tip of the arm 7.
- a bucket 8 that is rotatably mounted.
- the front work machine 5 includes a boom cylinder 9 that drives the boom 6, an arm cylinder 10 that drives the arm 7, and a bucket cylinder 11 that drives the bucket 8.
- the boom 6, the arm 7, and the bucket 8 described above constitute work elements that can be raised and lowered.
- the boom cylinder 9, the arm cylinder 10, and the bucket cylinder 11 described above constitute a double-acting hydraulic cylinder that drives the working elements.
- FIG. 2 is a hydraulic circuit diagram showing the configuration of the hydraulic drive device according to the present embodiment.
- the hydraulic drive device includes an engine 20 disposed in the engine chamber 4a of the revolving body 4 described above, and a first hydraulic pump 21, a second hydraulic pump 22, and a third hydraulic pump that are driven by the engine 20. 23 and a pilot pump 24. Further, the first working element direction control valve for controlling the flow of pressure oil supplied from the first hydraulic pump 21 to the bottom chamber 9a and the rod chamber 9b of the boom cylinder 9 described above, that is, the first boom direction control valve 28.
- a second working element direction control valve that controls the flow of pressure oil supplied from the second hydraulic pump 22 to the bottom chamber 9a and the rod chamber 9b of the boom cylinder 9, that is, a second boom direction control valve 29;
- a third working element direction control valve for controlling the flow of pressure oil supplied from the third hydraulic pump 23 to the bottom chamber 9a and the rod chamber 9b of the boom cylinder 9, that is, a third boom direction control valve 30 is provided. Yes. Further, an operation device 32 for switching the first boom direction control valve 28, the second boom direction control valve 29, and the third boom direction control valve 30 is provided.
- a jack-up switching valve 31 that is switched when the pressure in the bottom chamber 9a of the hydraulic cylinder, that is, the boom cylinder 9 reaches a predetermined pressure is provided.
- the jack-up switching valve 31 communicates the control chamber on the right position 29a side of the second boom direction control valve 29 with the tank when the pressure in the bottom chamber 9a of the boom cylinder 9 is greater than a predetermined pressure,
- the control room on the right position 30a side of the three-boom directional control valve 30 is communicated with the tank so that the second boom-directional control valve 29 and the third boom-directional control valve 30 are held neutral and operated.
- a first switching position 31a is provided for holding the first boom direction control valve 28 by the operation of the device 32 so as to be switched.
- the jack-up switching valve 32 is provided with the second boom direction control valve 29 and the third boom direction control valve 30 by the operation of the operation device 32 when the pressure in the bottom chamber 9a of the boom cylinder 9 is equal to or lower than a predetermined pressure.
- the second switching position 31b that enables the supply of the pressure oil discharged from the second hydraulic pump 22 and the third hydraulic pump 23 to the rod chamber 9b of the boom cylinder 9 is provided.
- the second switching position 28b of the first boom direction switching valve 28 has a regeneration circuit 28c that can supply pressure oil discharged from the bottom chamber 9a of the boom cylinder 9 to the rod chamber 9b of the boom cylinder 9. Yes.
- the second switching position 28b has a center bypass passage through which the pressure oil discharged from the first hydraulic pump 21 is released to the tank.
- the traveling right direction control valve 25 for controlling the flow of pressure oil supplied to the traveling right motor 2 provided in the traveling body 1 and the pressure oil supplied to the traveling left motor 3 are also described.
- a left direction control valve 29 for controlling the flow, and one of the second direction control valve 29, the right direction control valve 25 and the left direction control valve 26, for example, the left direction control valve 26. are connected in parallel to the second hydraulic pump 22.
- a communication valve 27 for communicating the upstream side of the traveling right direction control valve 25 and the upstream side of the traveling left direction control valve 26, the first hydraulic pump 21, the second hydraulic pump 22, and the third hydraulic pump 23.
- a main relief valve 33 that regulates the maximum discharge pressure.
- Other circuit configurations are omitted for the sake of simplicity.
- the second boom direction control valve 29 is switched to the left position 29b, and the pressure oil of the second hydraulic pump 22 is supplied to the bottom chamber 9a of the boom cylinder 9 via the second boom direction control valve 29. Further, the third boom direction control valve 30 is also switched to the left position 30 b, and the pressure oil of the third hydraulic pump 23 is supplied to the bottom chamber 9 a of the boom cylinder 9 through the third boom direction control valve 30.
- the oil in the rod chamber 9a of the boom cylinder 9 is the right position 28a of the first boom direction control valve 28, the left position 29b of the second boom direction control valve 29, and the left position 30b of the third boom direction control valve 30. After that, it is returned to the tank. In this way, the combined pressure oil from the first hydraulic pump 21, the second hydraulic pump 22, and the third hydraulic pump 23 is supplied to the bottom chamber 9a of the boom cylinder 9, and the boom cylinder 9 extends to FIG.
- the pressure in the bottom chamber 9a of the boom cylinder 9 is maintained at a pressure higher than a predetermined pressure, that is, a pressure higher than the switching pressure of the jackup switching valve 31, and the jackup switching valve 31 is at the first switching position 31a.
- a predetermined pressure that is, a pressure higher than the switching pressure of the jackup switching valve 31, and the jackup switching valve 31 is at the first switching position 31a.
- the control chamber on the right position 29a side of the second boom direction control valve 29 communicates with the tank in the same manner as the control chamber on the left position 29b side, and similarly, on the right position 30a side of the third boom direction control valve 30.
- the control chamber on the left position 30b side the control chamber is communicated with the tank, and the second boom direction control valve 29 and the third boom direction control valve 30 are held neutral.
- the pressure oil of the first hydraulic pump 21 is returned to the tank via the center bypass passage included in the left position 28b of the traveling right direction control valve 25 and the first boom direction control valve 28.
- the pressure oil of the second hydraulic pump 22 is returned to the tank through the second boom direction control valve 29 and the traveling left direction control valve 26.
- the pressure oil of the third hydraulic pump 23 is returned to the tank via the third boom direction control valve 30. Therefore, the pressure oil discharged from the first hydraulic pump 21, the second hydraulic pump 22, and the third hydraulic pump 23 is not supplied to the rod chamber 9 b of the boom cylinder 9.
- the first boom direction control valve 28 is switched to the left position 28b by the operation of the operation device 32 described above, and the second boom direction control valve 29 is supplied by the pilot pressure supplied via the jack-up switching valve 31. Is switched to the right position 29a, and the third boom direction control valve 30 is also switched to the right position 30a.
- the pressure oil of the first hydraulic pump 21 is returned to the tank through the center bypass passage at the left position 28b. Is not supplied to the boom cylinder 9.
- the pressure oil of the second hydraulic pump 22 is supplied to the rod chamber 9b of the boom cylinder 9 through the right position 29a of the second boom direction control valve 29.
- the pressure oil of the third hydraulic pump 23 is supplied to the rod chamber 9 b of the boom cylinder 9 through the right position 30 a of the third boom direction control valve 30.
- the boom cylinder 9 is contracted by the pressure oil of the second hydraulic pump 22 and the third hydraulic pump 23, and the boom cylinder 6 is driven in the downward direction to generate a pressing force against the ground surface, so that the jack up single operation is performed. Is called.
- the pressure oil from the hydraulic pump 23 is supplied to the rod chamber 9b of the boom cylinder 9 so that jack-up operation can be performed. That is, the jack-up operation is realized by the switching operation of the second boom direction control valve 29 and the third boom direction control valve 30 without providing the flow control valve and the center bypass switching valve as described in Patent Document 1. Can be made. Therefore, there is no fear of causing a mismatch in switching timing at the time of jackup operation due to the provision of the flow control valve and the center bypass switching valve, and the shock of the hydraulic excavator accompanying this jackup operation can be suppressed. In addition, it is possible to eliminate an uncomfortable feeling of the operator due to a response delay during the jackup operation.
- the pressure oil from the third hydraulic pump 23 is supplied to the rod chamber 9b of the boom cylinder 9 via the third boom direction control valve 30 to perform the jacking up operation. It is possible to perform a smooth combined operation of running and jacking up.
- the hydraulic oil discharged from the bottom chamber 9a of the boom cylinder 9 is connected to the boom cylinder via the regeneration circuit 28c included in the left position 28b of the first boom direction control valve 28. 9 is supplied to the rod chamber 9b and regenerated, whereby the boom 6 can be smoothly lowered in the air.
Abstract
Description
図1は、本実施形態に係る油圧駆動装置が備えられる油圧作業機の一例として挙げた油圧ショベルを示す側面図である。
図2は、本実施形態に係る油圧駆動装置の構成を示す油圧回路図である。
操作装置32が図2の矢印A方向に操作されると、パイロットポンプ24から吐出されるパイロット圧油が、第1ブーム用方向制御弁28の右位置28a側の制御室に与えられ、また、第2ブーム用方向制御弁29の左位置29b側の制御室に与えられ、また、第3ブーム用方向制御弁30の左位置30b側の制御室に与えられる。これにより、第1ブーム用方向制御弁28は右位置28aに切換えられ、第1油圧ポンプ21の圧油が走行右用方向制御弁25、第1ブーム用方向制御弁28を経てブームシリンダ9のボトム室9aに供給される。また、第2ブーム用方向制御弁29は左位置29bに切換えられ、第2油圧ポンプ22の圧油が第2ブーム用方向制御弁29を経てブームシリンダ9のボトム室9aに供給される。また、第3ブーム用方向制御弁30も左位置30bに切換えられ、第3油圧ポンプ23の圧油が第3ブーム用方向制御弁30を経てブームシリンダ9のボトム室9aに供給される。
操作装置32が図2の矢印B方向に操作されると、パイロット圧油が第1ブーム用方向制御弁28の左位置28b側の制御室に与えられて、この第1ブーム用方向制御弁28が左位置28bに切換えられる。これによってブームシリンダ9のボトム室9aがタンクに連通するとともに、ボトム室9aからの戻り油の一部が、第1ブーム用方向制御弁28の左位置28bに含まれる再生回路28cを介してブームシリンダ9のロッド室9bに供給され、再生が行なわれる。これによってブームシリンダ9が収縮して、ブーム6を含むフロント作業機5の自重によるブーム下げ単独操作が行われる。
フロント作業機5のバケット8等が接地面に押し当てられた状態で操作装置32が図2の矢印B方向に操作されて、車体を浮き上がらせるジャッキアップ単独操作が行われるときには、ブームシリンダ9のボトム室9aの圧力が所定圧以下に低下する。これに伴ってジャッキアップ切換弁31は、そのばね力により第2切換位置31bに切換えられる。
図示しない走行用の操作装置が操作されて走行右用方向制御弁25、及び走行左用方向制御弁26が切換えられると、第1油圧ポンプ21及び第2油圧ポンプ22の圧油が、これらの走行右用方向制御弁25、及び走行左用方向制御弁26を経て走行右モータ2及び走行左モータ3に供給される。すなわち、走行右モータ2及び走行左モータ3が作動して一対の履帯が駆動され、走行が行われる。
図示しない走行用の操作装置の操作とともに、操作装置32が図2の矢印A方向に操作されると、第1油圧ポンプ21及び第2油圧ポンプ22の圧油が、走行右用方向制御弁25及び走行左用方向制御弁26を経て走行右モータ2及び走行左モータ3に供給される。すなわち、第1油圧ポンプ21と第2油圧ポンプ22の圧油によって走行が行われる。第3油圧ポンプ23の圧油は、第3ブーム用方向制御弁30の左位置30bを経てブームシリンダ9のボトム室9aに供給される。すなわち、第3油圧ポンプ23の圧油によってブーム上げが行われる。
図示しない走行用の操作装置の操作とともに、操作装置32が図2の矢印A方向に操作されると、第1油圧ポンプ21及び第2油圧ポンプ22の圧油が、走行右モータ2及び走行左モータ3に供給されて走行が行なわれ、また、第1ブーム用方向制御弁28の第2切換位置28bに含まれる再生回路28cを介してブームシリンダ9aの圧油がロッド室9bに再生され、フロント作業機5の自重によるブーム下げ操作が行われる。
図示しない走行用の操作装置の操作とともに、操作装置32が図2の矢印A方向に操作されると、第1油圧ポンプ21及び第2油圧ポンプ22の圧油が、走行右モータ2及び走行左モータ3に供給されて走行が行なわれる。また、第3油圧ポンプ23の圧油が第3ブーム用方向制御弁30の左位置30bを経てブームシリンダ9のロッド室9bに供給され、この第3油圧ポンプ23の圧油によるジャッキアップ操作が行われる。
以上のように構成した本実施形態によれば、ジャッキアップ単独操作時には、ブームシリンダ9のボトム室9aの圧力が所定圧以下になると、ジャッキアップ切換弁31が第2切換位置31bに切換えられ、操作装置32による第2ブーム用方向制御弁29及び第3ブーム用方向制御弁30の切換え操作によって、第2油圧ポンプ22及び第3油圧ポンプ23の圧油がブームシリンダ9のロッド室9bに供給され、ジャッキアップ単独操作を実施させることができる。また、走行・ジャッキアップ複合操作時には、第1油圧ポンプ21及び第2油圧ポンプ22の圧油が走行右モータ2及び走行左モータ3に供給されて走行操作を実施させることができるとともに、第3油圧ポンプ23の圧油がブームシリンダ9のロッド室9bに供給されてジャッキアップ操作を実施させることができる。すなわち、特許文献1に記載のような流量制御弁、センタバイパス切換弁を設けることなく、第2ブーム用方向制御弁29及び第3ブーム用方向制御弁30の切換え操作によって、ジャッキアップ操作を実現させることができる。したがって、流量制御弁及びセンタバイパス切換弁を設けることに起因するジャッキアップ操作時の切換えタイミングの不一致を生じる懸念がなく、このジャッキアップ操作に伴う油圧ショベルのショックを抑えることができる。また、ジャッキアップ操作時の応答遅れによる操作者の違和感を解消させることができる。
2 走行右モータ
3 走行左モータ
4 旋回体
5 フロント作業機
6 ブーム(作業要素)
9 ブームシリンダ(油圧シリンダ)
9a ボトム室
9b ロッド室
21 第1油圧ポンプ
22 第2油圧ポンプ
23 第3油圧ポンプ
24 パイロットポンプ
25 走行右用方向制御弁
26 走行左用方向制御弁
28 第1ブーム用方向制御弁(第1作業要素用方向制御弁)
28a 右位置
28b 左位置
28c 再生回路
29 第2ブーム用方向制御弁(第2作業要素用方向制御弁)
29a 右位置
29b 左位置
30 第3ブーム用方向制御弁(第3作業要素用方向制御弁)
30a 右位置
30b 左位置
31 ジャッキアップ切換弁
31a 第1切換位置
31b 第2切換位置
32 操作装置
Claims (4)
- 上げ下げ動作が可能な作業要素を駆動する圧油を吐出する第1油圧ポンプ及び第2油圧ポンプと、これらの第1油圧ポンプ及び第2油圧ポンプから吐出される圧油によって作動し、上記作業要素を駆動する複動式の油圧シリンダと、上記第1油圧ポンプから上記油圧シリンダのボトム室及びロッド室に供給される圧油の流れを制御する第1作業要素用方向制御弁と、上記第2油圧ポンプから上記油圧シリンダの上記ボトム室及び上記ロッド室に供給される圧油の流れを制御する第2作業要素用方向制御弁と、上記第1作業要素用方向制御弁及び上記第2作業要素用方向制御弁を切換え操作する操作装置と、上記油圧シリンダの上記ボトム室の圧力が所定圧に達したときに切換えられるジャッキアップ切換弁とを備えた油圧作業機の油圧駆動装置において、
上記油圧シリンダの上記ボトム室及び上記ロッド室に供給される圧油の流れを制御し、
上記操作装置の操作によって切換えられる第3作業要素用方向制御弁と、この第3作業要素用方向制御弁に圧油を供給する第3油圧ポンプとを備え、
上記ジャッキアップ切換弁は、
上記油圧シリンダの上記ボトム室の圧力が上記所定圧より大きいときに、上記第2作業要素用方向制御弁及び上記第3作業要素用方向制御弁を中立に保持し、上記操作装置の操作による上記第1作業要素用方向制御弁の切換えを可能に保持する第1切換位置と、
上記油圧シリンダの上記ボトム室の圧力が上記所定圧以下のときに、上記操作装置の操作による上記第2作業要素用方向制御弁及び上記第3作業要素用方向制御弁の切換えに伴って、上記第2油圧ポンプ及び上記第3油圧ポンプから吐出される圧油の上記油圧シリンダの上記ロッド室への供給を可能に保持する第2切換位置とを有することを特徴とする油圧作業機の油圧駆動装置。 - 請求項1に記載の油圧作業機の油圧駆動装置において、
それぞれ一対の履帯のうちの該当する履帯を駆動する走行右モータ及び走行左モータと、上記走行右モータに供給される圧油の流れを制御する走行右用方向制御弁と、上記走行左モータに供給される圧油の流れを制御する走行左用方向制御弁とを備え、上記第2作業要素用方向制御弁と、上記走行右用方向制御弁及び上記走行左用方向制御弁のうちの一方とを、上記第2油圧ポンプに対してパラレル接続したことを特徴とする油圧作業機の油圧駆動装置。 - 請求項1に記載の油圧作業機の油圧駆動装置において、
上記第1作業要素用方向制御弁は、上記油圧シリンダの上記ボトム室から排出される圧油を上記油圧シリンダの上記ロッド室に供給可能な再生回路を有することを特徴とする油圧作業機の油圧駆動装置。 - 請求項1~3のいずれか1項に記載の油圧作業機の油圧駆動装置において、
上記油圧作業機は油圧ショベルから成り、
上記作業要素はブームから成り、
上記油圧シリンダはブームシリンダから成り、
上記第1作業要素用方向制御弁、上記第2作業要素用方向制御弁、及び上記第3作業要素用方向制御弁のそれぞれは、第1ブーム用方向制御弁、第2ブーム用方向制御弁、及び第3ブーム用方向制御弁から成ることを特徴とする油圧作業機の油圧駆動装置。
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US13/393,752 US8650778B2 (en) | 2009-09-02 | 2010-09-01 | Hydraulic drive device for hydraulic working machine |
EP10813740.7A EP2474746B1 (en) | 2009-09-02 | 2010-09-01 | Hydraulic drive device for hydraulic working machine |
CN201080039152.2A CN102575691B (zh) | 2009-09-02 | 2010-09-01 | 液压作业机的液压驱动装置 |
KR1020127007928A KR101316416B1 (ko) | 2009-09-02 | 2010-09-01 | 유압 작업기의 유압 구동 장치 |
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EP2474746B1 (en) | 2017-11-15 |
US20120163949A1 (en) | 2012-06-28 |
JP5356159B2 (ja) | 2013-12-04 |
JP2011052766A (ja) | 2011-03-17 |
KR20120053060A (ko) | 2012-05-24 |
EP2474746A4 (en) | 2016-03-30 |
CN102575691B (zh) | 2015-06-10 |
KR101316416B1 (ko) | 2013-10-08 |
EP2474746A1 (en) | 2012-07-11 |
CN102575691A (zh) | 2012-07-11 |
US8650778B2 (en) | 2014-02-18 |
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