US20100034630A1 - Hydraulic shovel - Google Patents
Hydraulic shovel Download PDFInfo
- Publication number
- US20100034630A1 US20100034630A1 US12/450,556 US45055608A US2010034630A1 US 20100034630 A1 US20100034630 A1 US 20100034630A1 US 45055608 A US45055608 A US 45055608A US 2010034630 A1 US2010034630 A1 US 2010034630A1
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- US
- United States
- Prior art keywords
- boom
- bucket
- control valve
- arm
- hydraulic
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
-
- 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
- E02F9/14—Booms only for booms with cable suspension arrangements; Cable suspensions
-
- 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
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
-
- 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
-
- 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
-
- 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
Definitions
- This invention relates to a hydraulic shovel in which a front attachment constituted by a boom, an arm, and a bucket is driven by a hydraulic cylinder.
- control valves are disposed in the vicinity of the respective hydraulic cylinders that drive the front attachment.
- control valves are disposed in series on an outer side of the boom.
- control valves are provided on the outside of the front attachment, and therefore the control valves, pipes thereof, and so on may be damaged through contact with an obstruction during an operation.
- This invention has been designed in consideration of these problems, and it is an object thereof to provide a hydraulic shovel with which the weight balance of a front attachment can be improved and damage to control valves and pipes can be prevented.
- This invention is a hydraulic shovel in which a vehicle body is provided revolvably on a traveling body.
- the hydraulic shovel comprises a boom connected rotatably to the vehicle body, an arm connected rotatably to the boom, a bucket connected rotatably to the arm, a boom hydraulic cylinder that drives the boom, an arm hydraulic cylinder that drives the arm, a bucket hydraulic cylinder that drives the bucket, and a boom control valve, an arm control valve and a bucket control valve which respectively control a flow of a working oil supplied to and discharged from the respective hydraulic cylinders, wherein the boom is formed to be hollow, and the bucket control valve is disposed in an interior of the boom.
- the weight of the bucket control valve is not applied to the arm, and therefore the weight balance of the front attachment improves, leading to an improvement in the operational stability of the front attachment. Furthermore, damage to the bucket control valve and pipes or the like connected thereto through contact with an obstruction is prevented.
- FIG. 1 is a side view showing a hydraulic shovel according to an embodiment of this invention.
- FIG. 2 shows a hydraulic circuit for supplying and discharging working oil to and from a bucket hydraulic cylinder.
- a vehicle body (revolving body) 2 is provided revolvably on an upper portion of a traveling body 6 .
- the hydraulic shovel 1 includes a boom 3 connected rotatably to the vehicle body 2 via a boom support shaft 7 , two boom hydraulic cylinders 10 for driving the boom 3 , an arm 4 connected rotatably to a tip end of the boom 3 via an arm support shaft 38 , an arm hydraulic cylinder 9 for driving the arm 4 , a bucket 5 connected rotatably to a tip end of the arm 4 via a bucket support shaft 51 , and a bucket hydraulic cylinder 8 for driving the bucket 5 .
- An oil pressure supply unit 21 is installed in the vehicle body 2 .
- the hydraulic cylinders 8 - 10 are caused to expand and contract by working oil introduced from the oil pressure supply unit 21 .
- the hydraulic cylinders 8 - 10 By causing the hydraulic cylinders 8 - 10 to expand and contract, the bucket 5 , arm 4 , and boom 3 are respectively rotated, whereby the hydraulic shovel performs operations such as ground excavation and earth transportation.
- An articulated front attachment is constituted by the boom 3 , arm 4 , and bucket 5 .
- the bucket 5 connected to the tip end of the arm 4 is not limited to ground excavation and earth transportation operations, and may perform other operations.
- the boom hydraulic cylinders (actuators) 10 provided in a pair are disposed on either side of the boom 3 .
- Each boom hydraulic cylinder 10 expands and contracts when a piston rod 12 is moved relative to a cylinder tube 11 by an oil pressure received by a piston (not shown) provided in the interior of the boom hydraulic cylinder 10 .
- a base end portion of each cylinder tube 11 is connected rotatably to the vehicle body 2 via a support shaft 13
- a tip end portion of each piston rod 12 is connected rotatably to the boom 3 via a support shaft 14 .
- the two boom hydraulic cylinders 10 drive the boom 3 by expanding and contracting synchronously in accordance with working oil pressure supplied and discharged via a control valve 15 .
- the arm hydraulic cylinder (actuator) 9 that drives the arm 4 is disposed on a back portion of the boom 3 .
- the arm hydraulic cylinder 9 expands and contracts when a piston rod 32 is moved relative to a cylinder tube 31 by an oil pressure received by a piston (not shown).
- a base end portion of the cylinder tube 31 is connected rotatably to the boom 3 via a support shaft 33
- a tip end portion of the piston rod 32 is connected rotatably to the arm 4 via a support shaft 34 .
- the arm hydraulic cylinder 9 drives the arm 4 by expanding and contracting in accordance with working oil pressure supplied and discharged via a control valve 35 .
- the bucket hydraulic cylinder (actuator) 8 that drives the bucket 5 is disposed on a back portion of the arm 4 .
- a base end portion of a cylinder tube 41 is connected rotatably to the arm 4 via a support shaft 43
- a tip end portion of a piston rod 42 is connected rotatably to the bucket 5 via a support shaft 44 .
- FIG. 2 shows a hydraulic circuit for supplying and discharging working oil to and from the bucket hydraulic cylinder 8 .
- the piston rod 42 is inserted into the cylinder tube 41 of the bucket hydraulic cylinder 8 to be free to advance and retreat, and a piston 46 is connected to a base end portion of the piston rod 42 .
- the piston 46 is interposed into an inner periphery of the cylinder tube 41 to be free to slide, and divides the interior of the cylinder tube 41 into an anti rod-side oil chamber 47 and a rod-side oil chamber 48 .
- the working oil is supplied to and discharged from the anti rod-side oil chamber 47 and the rod-side oil chamber 48 via a control valve 45 , and the bucket hydraulic cylinder 8 drives the bucket 5 by expanding and contracting in accordance with the pressure of this working oil.
- the control valve 45 is constituted by four solenoid valves V 1 to V 4 interposed into a bridge circuit.
- the solenoid valves V 1 to V 4 are opened and closed in accordance with an output signal from a controller 30 , thereby causing the hydraulic cylinder 8 to expand and contract.
- a supply passage 25 through which the working oil to be supplied to the hydraulic cylinder 8 flows is connected to a discharge side of a hydraulic pump 22 , and the supply passage 25 is connected to branch passages 26 , 27 that bifurcate in two directions.
- the branch passages 26 , 27 then re-converge so as to join a return passage 23 through which the working oil that is discharged from the hydraulic cylinder 8 flows.
- the return passage 23 is connected to a suction side of the hydraulic pump 22 .
- a meter-in solenoid valve V 1 that controls the flow of the working oil supplied to the anti rod-side oil chamber 47 of the hydraulic cylinder 8 and a meter-in solenoid valve V 3 that controls the flow of the working oil supplied to the rod-side oil chamber 48 are interposed in parallel in the branch passages 26 , 27 .
- a meter-out solenoid valve V 2 that controls the flow of the working oil discharged from the anti rod-side oil chamber 47 of the hydraulic cylinder 8 and a meter-out solenoid valve V 4 that controls the flow of the working oil discharged from the rod-side oil chamber 48 are interposed in parallel in the branch passages 26 , 27 .
- the meter-in solenoid valve V 1 and the meter-out solenoid valve V 2 are interposed in series in the branch passage 26
- the meter-in solenoid valve V 3 and the meter-out solenoid valve V 4 are interposed in series in the branch passage 27 .
- a first supply/discharge passage 28 that communicates with the anti rod-side oil chamber 47 is connected between the meter-in solenoid valve V 1 and the meter-out solenoid valve V 2 in the branch passage 26 .
- a second supply/discharge passage 29 that communicates with the rod-side oil chamber 48 is connected between the meter-in solenoid valve V 3 and the meter-out solenoid valve V 4 in the branch passage 27 .
- the meter-in solenoid valve V 1 , meter-out solenoid valve V 2 , meter-in solenoid valve V 3 , and meter-out solenoid valve V 4 are solenoid control valves (flow control valves). Each solenoid valve V 1 to V 4 is driven by a control current output from the controller 30 such that an opening area thereof is adjusted in accordance with the control current. Hence, the controller 30 adjusts the opening areas of the respective solenoid valves V 1 to V 4 individually such that the flow of the working oil passing through the respective solenoid valves V 1 to V 4 is controlled individually. Signals from pressure sensors 18 , 19 that detect the pressure in the first supply/discharge passage 28 and the second supply/discharge passage 29 , respectively, are input into the controller 30 .
- the boom control valve 15 and the arm control valve 35 are constituted similarly to the bucket control valve 45 , and are controlled by control currents output from the controller 30 .
- the respective control valves 15 , 35 , 45 can be disposed discretely.
- the discretely disposed control valves are provided in the vicinity of the respective hydraulic cylinders in an attempt to reduce the length of hydraulic pipes connecting the control valves to the hydraulic cylinders.
- the bucket control valve when the bucket control valve is provided in the vicinity of the bucket hydraulic cylinder, the bucket control valve moves together with the arm, and therefore the bucket control valve and pipes or the like connected thereto may be damaged through contact with an obstruction.
- this invention improves the weight balance of the front attachment and prevents damage to the bucket control valve 45 and pipes connected thereto by providing the discretely disposed bucket control valve 45 in the interior of the boom 3 .
- the discretely disposed control valves 15 , 35 , 45 are all provided in the interior of the boom 3 .
- the boom 3 is formed in a hollow box shape from steel plate, and the respective control valves 15 , 35 , 45 are accommodated in an interior space thereof.
- Each control valve 15 , 35 , 45 is supported via a support member (not shown).
- the control valves 15 , 35 , 45 are disposed above the boom support shaft 7 that supports the boom 3 rotatably on the vehicle body 2 . More specifically, each control valve 15 , 35 , 45 is disposed in a higher position than the boom support shaft 7 , which serves as a rotary axis of the front attachment, regardless of a rotation position of the boom 3 , and each control valve 15 , 35 , 45 is disposed so as to be positioned vertically above the boom support shaft 7 in accordance with the rotation position of the boom 3 . As a result, a force generated in a rotation direction of the front attachment weakens. In other words, the weight balance of the front attachment improves, leading to operational stability.
- Each control valve 15 , 35 , 45 is accommodated in a rear portion of the boom 3 , or in other words a position close to a revolving central axis O of the vehicle body 2 .
- a free end side of the front attachment decreases in weight and a side thereof close to the vehicle body 2 increases in weight.
- the weight balance of the front attachment improves, leading to operational stability.
- the center of gravity of the hydraulic shovel 1 is positioned close to the revolving central axis O, and therefore the traveling stability of the hydraulic shovel 1 also improves.
- a direction extending from the boom support shaft 7 to the arm support shaft 38 forms the front of the boom 3 and an opposite direction thereto forms the rear of the boom 3 .
- the bucket control valve 45 is preferably disposed vertically above the boom support shaft 7 in a state where the boom hydraulic cylinders 10 are positioned in near a neutral state. By disposing the bucket control valve 45 in this manner, the weight balance of the front attachment is improved even further.
- the control valves 15 , 35 , 45 are disposed in series in a front-rear direction of the boom 3 .
- the bucket control valve 45 is disposed between the boom control valve 15 and the arm control valve 35 .
- the boom control valve 15 is disposed to the rear of the bucket control valve 45
- the arm control valve 35 is disposed to the front of the bucket control valve 45 .
- Supply/discharge passages 16 , 17 , 36 , 37 , 28 , 29 extending respectively from the control valves 15 , 35 , 45 to the hydraulic cylinders 10 , 9 , 8 are partially accommodated in the interior of the boom 3 .
- the hydraulic shovel 1 constituted as described above causes the hydraulic cylinders 10 , 9 , 8 to expand and contract by switching supply and discharge of the working oil to and from the hydraulic cylinders 10 , 9 , 8 through the respective control valves 15 , 35 , 45 .
- the articulated front attachment constituted by the boom 3 , arm 4 , and bucket 5 is driven to perform ground excavation and earth transportation operations via the bucket 5 connected to the tip end of the arm 4 .
- the bucket control valve 45 is disposed in the interior of the hollow box-shaped boom 3 , and therefore the weight of the bucket control valve is not applied to the arm 4 . Hence, the weight balance of the front attachment improves, leading to an improvement in the operational stability of the front attachment. Furthermore, damage to the bucket control valve 45 and pipes or the like connected thereto through contact with an obstruction can be prevented.
- the bucket control valve 45 is disposed above the boom support shaft 7 , thereby improving the weight balance of the front attachment and leading to operational stability.
- the boom control valve 15 and the arm control valve 35 are disposed in the interior of the boom 3 in series with the bucket control valve 45 , leading to a further improvement in the weight balance of the front attachment. Hence, operations of the front attachment are stabilized, and damage to the respective control valves 45 , 15 , 35 and pipes or the like connected thereto is prevented.
- the bucket control valve 45 is constituted by the solenoid valves V 1 to V 4 which are opened and closed individually by a control current output from the controller 30 , and therefore the bucket control valve 45 can be disposed in the interior of the boom 3 without disposal constraints.
- This invention may be applied to a hydraulic shovel that performs operations such as ground excavation and earth transportation.
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
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Abstract
A hydraulic shovel (1) in which a vehicle body (2) is provided revolvably on a traveling body (6) includes a boom (3) connected rotatably to the vehicle body (2), an arm (4) connected rotatably to the boom (3), a bucket (5) connected rotatably to the arm (4), a boom hydraulic cylinder (10) that drives the boom (3), an arm hydraulic cylinder (9) that drives the arm (4), a bucket hydraulic cylinder (8) that drives the bucket (5), and a boom control valve (15), an arm control valve (35) and a bucket control valve (45) which respectively control a flow of a working oil supplied to and discharged from the respective hydraulic cylinders (8, 9, 10), wherein the boom (3) is formed to be hollow, and the bucket control valve (45) is disposed in an interior of the boom (3).
Description
- This invention relates to a hydraulic shovel in which a front attachment constituted by a boom, an arm, and a bucket is driven by a hydraulic cylinder.
- In a conventional hydraulic shovel, discretely disposed control valves are provided in the front attachment, and a flow of working oil supplied to and discharged from respective hydraulic cylinders is controlled by the respective control valves (see JP2004-293089A and JP2005-68718A).
- In the hydraulic shovel disclosed in JP2004-293089A, the control valves are disposed in the vicinity of the respective hydraulic cylinders that drive the front attachment.
- In the hydraulic shovel disclosed in JP2005-68718A, the control valves are disposed in series on an outer side of the boom.
- However, in this type of conventional hydraulic shovel, the control valves are provided on the front attachment, and therefore the weight balance of the front attachment deteriorates due to the weight of the control valves.
- Furthermore, the control valves are provided on the outside of the front attachment, and therefore the control valves, pipes thereof, and so on may be damaged through contact with an obstruction during an operation.
- This invention has been designed in consideration of these problems, and it is an object thereof to provide a hydraulic shovel with which the weight balance of a front attachment can be improved and damage to control valves and pipes can be prevented.
- This invention is a hydraulic shovel in which a vehicle body is provided revolvably on a traveling body. The hydraulic shovel comprises a boom connected rotatably to the vehicle body, an arm connected rotatably to the boom, a bucket connected rotatably to the arm, a boom hydraulic cylinder that drives the boom, an arm hydraulic cylinder that drives the arm, a bucket hydraulic cylinder that drives the bucket, and a boom control valve, an arm control valve and a bucket control valve which respectively control a flow of a working oil supplied to and discharged from the respective hydraulic cylinders, wherein the boom is formed to be hollow, and the bucket control valve is disposed in an interior of the boom.
- According to this invention, the weight of the bucket control valve is not applied to the arm, and therefore the weight balance of the front attachment improves, leading to an improvement in the operational stability of the front attachment. Furthermore, damage to the bucket control valve and pipes or the like connected thereto through contact with an obstruction is prevented.
-
FIG. 1 is a side view showing a hydraulic shovel according to an embodiment of this invention. -
FIG. 2 shows a hydraulic circuit for supplying and discharging working oil to and from a bucket hydraulic cylinder. - An embodiment of this invention will be described below with reference to the drawings.
- As shown in
FIG. 1 , in a hydraulic shovel (construction machine) 1 according to an embodiment of this invention, a vehicle body (revolving body) 2 is provided revolvably on an upper portion of a travelingbody 6. - The
hydraulic shovel 1 includes aboom 3 connected rotatably to thevehicle body 2 via aboom support shaft 7, two boomhydraulic cylinders 10 for driving theboom 3, anarm 4 connected rotatably to a tip end of theboom 3 via anarm support shaft 38, an armhydraulic cylinder 9 for driving thearm 4, abucket 5 connected rotatably to a tip end of thearm 4 via abucket support shaft 51, and a buckethydraulic cylinder 8 for driving thebucket 5. - An oil
pressure supply unit 21 is installed in thevehicle body 2. The hydraulic cylinders 8-10 are caused to expand and contract by working oil introduced from the oilpressure supply unit 21. By causing the hydraulic cylinders 8-10 to expand and contract, thebucket 5,arm 4, andboom 3 are respectively rotated, whereby the hydraulic shovel performs operations such as ground excavation and earth transportation. - An articulated front attachment is constituted by the
boom 3,arm 4, andbucket 5. It should be noted that thebucket 5 connected to the tip end of thearm 4 is not limited to ground excavation and earth transportation operations, and may perform other operations. - The boom hydraulic cylinders (actuators) 10 provided in a pair are disposed on either side of the
boom 3. Each boomhydraulic cylinder 10 expands and contracts when apiston rod 12 is moved relative to acylinder tube 11 by an oil pressure received by a piston (not shown) provided in the interior of the boomhydraulic cylinder 10. A base end portion of eachcylinder tube 11 is connected rotatably to thevehicle body 2 via asupport shaft 13, while a tip end portion of eachpiston rod 12 is connected rotatably to theboom 3 via asupport shaft 14. The two boomhydraulic cylinders 10 drive theboom 3 by expanding and contracting synchronously in accordance with working oil pressure supplied and discharged via acontrol valve 15. - The arm hydraulic cylinder (actuator) 9 that drives the
arm 4 is disposed on a back portion of theboom 3. The armhydraulic cylinder 9 expands and contracts when apiston rod 32 is moved relative to acylinder tube 31 by an oil pressure received by a piston (not shown). A base end portion of thecylinder tube 31 is connected rotatably to theboom 3 via asupport shaft 33, while a tip end portion of thepiston rod 32 is connected rotatably to thearm 4 via asupport shaft 34. The armhydraulic cylinder 9 drives thearm 4 by expanding and contracting in accordance with working oil pressure supplied and discharged via acontrol valve 35. - The bucket hydraulic cylinder (actuator) 8 that drives the
bucket 5 is disposed on a back portion of thearm 4. A base end portion of acylinder tube 41 is connected rotatably to thearm 4 via asupport shaft 43, while a tip end portion of apiston rod 42 is connected rotatably to thebucket 5 via asupport shaft 44. -
FIG. 2 shows a hydraulic circuit for supplying and discharging working oil to and from the buckethydraulic cylinder 8. - The
piston rod 42 is inserted into thecylinder tube 41 of the buckethydraulic cylinder 8 to be free to advance and retreat, and apiston 46 is connected to a base end portion of thepiston rod 42. Thepiston 46 is interposed into an inner periphery of thecylinder tube 41 to be free to slide, and divides the interior of thecylinder tube 41 into an anti rod-side oil chamber 47 and a rod-side oil chamber 48. The working oil is supplied to and discharged from the anti rod-side oil chamber 47 and the rod-side oil chamber 48 via acontrol valve 45, and the buckethydraulic cylinder 8 drives thebucket 5 by expanding and contracting in accordance with the pressure of this working oil. - The
control valve 45 is constituted by four solenoid valves V1 to V4 interposed into a bridge circuit. The solenoid valves V1 to V4 are opened and closed in accordance with an output signal from acontroller 30, thereby causing thehydraulic cylinder 8 to expand and contract. - A
supply passage 25 through which the working oil to be supplied to thehydraulic cylinder 8 flows is connected to a discharge side of ahydraulic pump 22, and thesupply passage 25 is connected tobranch passages branch passages return passage 23 through which the working oil that is discharged from thehydraulic cylinder 8 flows. Thereturn passage 23 is connected to a suction side of thehydraulic pump 22. - A meter-in solenoid valve V1 that controls the flow of the working oil supplied to the anti rod-
side oil chamber 47 of thehydraulic cylinder 8 and a meter-in solenoid valve V3 that controls the flow of the working oil supplied to the rod-side oil chamber 48 are interposed in parallel in thebranch passages - Further, a meter-out solenoid valve V2 that controls the flow of the working oil discharged from the anti rod-
side oil chamber 47 of thehydraulic cylinder 8 and a meter-out solenoid valve V4 that controls the flow of the working oil discharged from the rod-side oil chamber 48 are interposed in parallel in thebranch passages - Hence, the meter-in solenoid valve V1 and the meter-out solenoid valve V2 are interposed in series in the
branch passage 26, while the meter-in solenoid valve V3 and the meter-out solenoid valve V4 are interposed in series in thebranch passage 27. - A first supply/
discharge passage 28 that communicates with the anti rod-side oil chamber 47 is connected between the meter-in solenoid valve V1 and the meter-out solenoid valve V2 in thebranch passage 26. A second supply/discharge passage 29 that communicates with the rod-side oil chamber 48 is connected between the meter-in solenoid valve V3 and the meter-out solenoid valve V4 in thebranch passage 27. - The meter-in solenoid valve V1, meter-out solenoid valve V2, meter-in solenoid valve V3, and meter-out solenoid valve V4 are solenoid control valves (flow control valves). Each solenoid valve V1 to V4 is driven by a control current output from the
controller 30 such that an opening area thereof is adjusted in accordance with the control current. Hence, thecontroller 30 adjusts the opening areas of the respective solenoid valves V1 to V4 individually such that the flow of the working oil passing through the respective solenoid valves V1 to V4 is controlled individually. Signals frompressure sensors discharge passage 28 and the second supply/discharge passage 29, respectively, are input into thecontroller 30. - The
boom control valve 15 and thearm control valve 35 are constituted similarly to thebucket control valve 45, and are controlled by control currents output from thecontroller 30. Hence, in thehydraulic shovel 1, therespective control valves - In a conventional hydraulic shovel, the discretely disposed control valves are provided in the vicinity of the respective hydraulic cylinders in an attempt to reduce the length of hydraulic pipes connecting the control valves to the hydraulic cylinders.
- However, when the bucket control valve is provided in the vicinity of the bucket hydraulic cylinder, the weight balance of the front attachment constituted by the boom, arm, and bucket deteriorates due to the weight of the bucket control valve. In other words, a center of gravity of the
hydraulic shovel 1 shifts forward, causing thehydraulic shovel 1 to become unstable. - Furthermore, when the bucket control valve is provided in the vicinity of the bucket hydraulic cylinder, the bucket control valve moves together with the arm, and therefore the bucket control valve and pipes or the like connected thereto may be damaged through contact with an obstruction.
- In response to this problem, this invention improves the weight balance of the front attachment and prevents damage to the
bucket control valve 45 and pipes connected thereto by providing the discretely disposedbucket control valve 45 in the interior of theboom 3. - In this embodiment, the discretely disposed
control valves boom 3. - The
boom 3 is formed in a hollow box shape from steel plate, and therespective control valves control valve - The
control valves boom support shaft 7 that supports theboom 3 rotatably on thevehicle body 2. More specifically, eachcontrol valve boom support shaft 7, which serves as a rotary axis of the front attachment, regardless of a rotation position of theboom 3, and eachcontrol valve boom support shaft 7 in accordance with the rotation position of theboom 3. As a result, a force generated in a rotation direction of the front attachment weakens. In other words, the weight balance of the front attachment improves, leading to operational stability. - Each
control valve boom 3, or in other words a position close to a revolving central axis O of thevehicle body 2. As a result, a free end side of the front attachment decreases in weight and a side thereof close to thevehicle body 2 increases in weight. Thus, the weight balance of the front attachment improves, leading to operational stability. Furthermore, the center of gravity of thehydraulic shovel 1 is positioned close to the revolving central axis O, and therefore the traveling stability of thehydraulic shovel 1 also improves. It should be noted that in theboom 3, a direction extending from theboom support shaft 7 to thearm support shaft 38 forms the front of theboom 3 and an opposite direction thereto forms the rear of theboom 3. - As shown in
FIG. 1 , thebucket control valve 45 is preferably disposed vertically above theboom support shaft 7 in a state where the boomhydraulic cylinders 10 are positioned in near a neutral state. By disposing thebucket control valve 45 in this manner, the weight balance of the front attachment is improved even further. - The
control valves boom 3. Thebucket control valve 45 is disposed between theboom control valve 15 and thearm control valve 35. Theboom control valve 15 is disposed to the rear of thebucket control valve 45, and thearm control valve 35 is disposed to the front of thebucket control valve 45. - Supply/
discharge passages control valves hydraulic cylinders boom 3. - The
hydraulic shovel 1 constituted as described above causes thehydraulic cylinders hydraulic cylinders respective control valves boom 3,arm 4, andbucket 5 is driven to perform ground excavation and earth transportation operations via thebucket 5 connected to the tip end of thearm 4. - According to the embodiment described above, the following effects are obtained.
- The
bucket control valve 45 is disposed in the interior of the hollow box-shapedboom 3, and therefore the weight of the bucket control valve is not applied to thearm 4. Hence, the weight balance of the front attachment improves, leading to an improvement in the operational stability of the front attachment. Furthermore, damage to thebucket control valve 45 and pipes or the like connected thereto through contact with an obstruction can be prevented. - Moreover, the
bucket control valve 45 is disposed above theboom support shaft 7, thereby improving the weight balance of the front attachment and leading to operational stability. - Furthermore, the
boom control valve 15 and thearm control valve 35 are disposed in the interior of theboom 3 in series with thebucket control valve 45, leading to a further improvement in the weight balance of the front attachment. Hence, operations of the front attachment are stabilized, and damage to therespective control valves - Further, the
bucket control valve 45 is constituted by the solenoid valves V1 to V4 which are opened and closed individually by a control current output from thecontroller 30, and therefore thebucket control valve 45 can be disposed in the interior of theboom 3 without disposal constraints. - This invention is not limited to the embodiment described above, and may be subjected to various modifications within the scope of the technical spirit thereof.
- This invention may be applied to a hydraulic shovel that performs operations such as ground excavation and earth transportation.
Claims (4)
1. A hydraulic shovel (1) in which a vehicle body (2) is provided revolvably on a traveling body (6), comprising:
a boom (3) connected rotatably to the vehicle body (2);
an arm (4) connected rotatably to the boom (3);
a bucket (5) connected rotatably to the arm (4);
a boom hydraulic cylinder (10) that drives the boom (3);
an arm hydraulic cylinder (9) that drives the arm (4);
a bucket hydraulic cylinder (8) that drives the bucket (5); and
a boom control valve (15), an arm control valve (35) and a bucket control valve (45) which respectively control a flow of a working oil supplied to and discharged from the respective hydraulic cylinders (8, 9, 10),
wherein the boom (3) is formed to be hollow, and
the bucket control valve (45) is disposed in an interior of the boom (3).
2. The hydraulic shovel as defined in claim 1 , further comprising a boom support shaft (7) that supports the boom (3) rotatably on the vehicle body (2), wherein the bucket control valve (45) is disposed above the boom support shaft (7).
3. The hydraulic shovel as defined in claim 2 , wherein the boom control valve (15) and the arm control valve (35) are disposed in the interior of the boom (3) in series with the bucket control valve (45).
4. The hydraulic shovel as defined in claim 1 , wherein an anti rod-side oil chamber (47) and a rod-side oil chamber (48) defined by a piston (46) are provided in an interior of the bucket hydraulic cylinder (8), and the bucket control valve (45) comprises:
a first meter-in solenoid valve (V1) that controls the flow of the working oil supplied to the anti rod-side oil chamber (47);
a first meter-out solenoid valve (V2) that controls the flow of the working oil discharged from the anti rod-side oil chamber (47);
a second meter-in solenoid valve (V3) that controls the flow of the working oil supplied to the rod-side oil chamber (48);
a second meter-out solenoid valve (V4) that controls the flow of the working oil discharged from the rod-side oil chamber (48); and
a controller (30) that controls the flow of the working oil passing through the respective meter-in solenoid valves (V1, V3) and the respective meter-out solenoid valves (V2, V4) individually.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-108204 | 2007-04-17 | ||
JP2007108204A JP5238181B2 (en) | 2007-04-17 | 2007-04-17 | Excavator |
PCT/JP2008/057368 WO2008129990A1 (en) | 2007-04-17 | 2008-04-09 | Hydraulic shovel |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100034630A1 true US20100034630A1 (en) | 2010-02-11 |
Family
ID=39875518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/450,556 Abandoned US20100034630A1 (en) | 2007-04-17 | 2008-04-09 | Hydraulic shovel |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100034630A1 (en) |
JP (1) | JP5238181B2 (en) |
KR (1) | KR101142667B1 (en) |
CN (1) | CN101641481B (en) |
GB (1) | GB2460569B (en) |
WO (1) | WO2008129990A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140088839A1 (en) * | 2011-03-08 | 2014-03-27 | Sumitomo (S.H.I.) Construction Machinery Co., Ltd. | Shovel and method for controlling shovel |
US20150284931A1 (en) * | 2012-12-21 | 2015-10-08 | Sumitomo(S.H.I.) Construction Machinery Co., Ltd. | Shovel and method of controlling shovel |
US20200299933A1 (en) * | 2017-12-12 | 2020-09-24 | Sumitomo Heavy Industries, Ltd. | Shovel |
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GB2477759B (en) * | 2010-02-11 | 2015-02-18 | Bamford Excavators Ltd | Working machine |
KR20120072521A (en) | 2010-12-24 | 2012-07-04 | 두산인프라코어 주식회사 | Method for auto controlling transmission of wheel loader |
EP2730704B1 (en) * | 2011-07-06 | 2017-08-30 | Sumitomo Heavy Industries, Ltd. | Regenerative hydraulic circuit for a shovel and method for controlling a shovel |
US10601281B2 (en) | 2012-03-26 | 2020-03-24 | Joy Global Surface Mining Inc. | Modular direct drive system for an industrial machine |
CN103321267B (en) * | 2013-06-24 | 2018-04-20 | 上海三一重机有限公司 | A kind of variable hinge scraper bowl and excavator |
CN103452162A (en) * | 2013-08-19 | 2013-12-18 | 山重建机有限公司 | Negative-flow energy saving device of hydraulic excavator |
KR102083687B1 (en) * | 2013-12-26 | 2020-04-14 | 두산인프라코어 주식회사 | Combined operation controlling appratus of construction machine |
CN104164896B (en) * | 2014-08-19 | 2016-06-29 | 广西大学 | The multi-freedom-degreecontrollable controllable mechanism type excavator that a kind of single action source drives |
CN105649133B (en) * | 2015-12-31 | 2018-08-17 | 太原重工股份有限公司 | Mine mechanical face digger and its dipper crowding gear lost-control protection method, apparatus |
CN107574847A (en) * | 2016-07-05 | 2018-01-12 | 天津卡斯特机械有限公司 | A kind of digging arm of excavator |
CN107700578A (en) * | 2017-09-30 | 2018-02-16 | 山东临工工程机械有限公司 | Loading machine hydraulic system of working |
CN114775712A (en) * | 2022-04-18 | 2022-07-22 | 柳州柳工挖掘机有限公司 | Digging machine |
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JP2553234Y2 (en) * | 1992-01-16 | 1997-11-05 | 株式会社クボタ | Backhoe |
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- 2008-04-09 KR KR1020097023803A patent/KR101142667B1/en active IP Right Grant
- 2008-04-09 CN CN2008800097353A patent/CN101641481B/en not_active Expired - Fee Related
- 2008-04-09 US US12/450,556 patent/US20100034630A1/en not_active Abandoned
- 2008-04-09 GB GB0916681A patent/GB2460569B/en not_active Expired - Fee Related
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US3556322A (en) * | 1969-05-15 | 1971-01-19 | Waite Inc J P | Hydraulic system for a power operated apparatus |
US20050175485A1 (en) * | 2002-09-05 | 2005-08-11 | Tsutomu Udagawa | Hydraulic driving system of construction machinery |
US20060162545A1 (en) * | 2003-03-26 | 2006-07-27 | Masaki Dohgami | Hydraulic cylinder device |
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US20140088839A1 (en) * | 2011-03-08 | 2014-03-27 | Sumitomo (S.H.I.) Construction Machinery Co., Ltd. | Shovel and method for controlling shovel |
US8972122B2 (en) * | 2011-03-08 | 2015-03-03 | Sumitomo (S.H.I.) Construction Machinery Co., Ltd. | Shovel and method for controlling shovel |
US20150284931A1 (en) * | 2012-12-21 | 2015-10-08 | Sumitomo(S.H.I.) Construction Machinery Co., Ltd. | Shovel and method of controlling shovel |
US9382687B2 (en) * | 2012-12-21 | 2016-07-05 | Sumitomo(S.H.I.) Construction Machinery Co., Ltd. | Shovel and method of controlling shovel |
US10132056B2 (en) | 2012-12-21 | 2018-11-20 | Sumitomo(S.H.I.) Construction Machinery Co., Ltd. | Shovel |
EP3561184A1 (en) * | 2012-12-21 | 2019-10-30 | Sumitomo (S.H.I.) Construction Machinery Co., Ltd. | Drag and lift control of a shovel |
US20200299933A1 (en) * | 2017-12-12 | 2020-09-24 | Sumitomo Heavy Industries, Ltd. | Shovel |
US11572676B2 (en) * | 2017-12-12 | 2023-02-07 | Sumitomo Heavy Industries, Ltd. | Shovel |
Also Published As
Publication number | Publication date |
---|---|
GB2460569A (en) | 2009-12-09 |
CN101641481B (en) | 2011-12-28 |
KR101142667B1 (en) | 2012-05-11 |
JP2008266909A (en) | 2008-11-06 |
WO2008129990A1 (en) | 2008-10-30 |
GB2460569B (en) | 2011-12-07 |
JP5238181B2 (en) | 2013-07-17 |
KR20100007877A (en) | 2010-01-22 |
GB0916681D0 (en) | 2009-11-04 |
CN101641481A (en) | 2010-02-03 |
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Owner name: KAYABA INDUSTRY CO., LTD.,JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KOBATA, HIROSHI;REEL/FRAME:023327/0397 Effective date: 20090820 |
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