WO2013021692A1 - バックホーローダ - Google Patents
バックホーローダ Download PDFInfo
- Publication number
- WO2013021692A1 WO2013021692A1 PCT/JP2012/060456 JP2012060456W WO2013021692A1 WO 2013021692 A1 WO2013021692 A1 WO 2013021692A1 JP 2012060456 W JP2012060456 W JP 2012060456W WO 2013021692 A1 WO2013021692 A1 WO 2013021692A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- backhoe
- hydraulic
- driver
- loader
- seat
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 27
- 239000010720 hydraulic oil Substances 0.000 claims description 23
- 239000003921 oil Substances 0.000 claims description 16
- 239000000446 fuel Substances 0.000 abstract description 7
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 238000009412 basement excavation Methods 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- 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
- E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
- E02F3/963—Arrangements on backhoes for alternate use of different tools
- E02F3/964—Arrangements on backhoes for alternate use of different tools of several tools mounted on one machine
-
- 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
- E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
-
- 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
- E02F9/16—Cabins, platforms, or the like, for drivers
- E02F9/166—Cabins, platforms, or the like, for drivers movable, tiltable or pivoting, e.g. movable seats, dampening arrangements of cabins
-
- 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
- E02F9/2004—Control mechanisms, e.g. control levers
- E02F9/2012—Setting the functions of the control levers, e.g. changing assigned functions among operations levers, setting functions dependent on the operator or seat orientation
-
- 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
- E02F9/2221—Control of flow rate; Load sensing arrangements
-
- 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
- E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
-
- 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
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
- F16H47/06—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
Definitions
- the present invention relates to a backhoe loader, and more particularly to a backhoe loader having a transmission with a hydraulic clutch.
- the backhoe loader has a loader bucket at the front of the vehicle and a backhoe at the rear.
- the driver's seat provided in the cab is configured to be rotatable so as to face forward when traveling or working with a loader bucket, and to face backward when working with a backhoe.
- the link when the loader bucket is operated from the most hoisted position to the most entrained position, the link is configured so that the excavation force curve at the bucket end becomes flatter. .
- Patent Document 2 discloses a backhoe loader equipped with a power transmission.
- a modulation relief valve is provided between the main transmission operation valve of the power transmission and the hydraulic pump.
- the backhoe loader is provided with a plurality of hydraulic pumps such as a traveling hydraulic pump and a working machine driving hydraulic pump.
- the traveling hydraulic pump is a pump for supplying hydraulic oil to a hydraulic clutch provided in the transmission.
- the working machine hydraulic pump is a pump for supplying hydraulic oil to a hydraulic cylinder for driving the working machine.
- An object of the present invention is to reduce fuel consumption by reducing a load of a hydraulic pump in a backhoe loader.
- the backhoe loader is provided with a transmission having one or more hydraulic clutches, a driver's cab having a driver's seat that can take two positions facing forward and rearward, and a front of the driver's cab.
- Hydraulic pump having a loader provided, a backhoe provided behind the cab, a hydraulic pump for supplying hydraulic oil to the hydraulic clutch, and a relief valve for setting the hydraulic pressure in the circuit to the first hydraulic pressure
- a hydraulic circuit that supplies hydraulic oil from the hydraulic clutch to the hydraulic clutch, an operation mode determination unit that determines whether or not the operation mode is a backhoe operation mode using a backhoe, and a relief valve control unit.
- the relief valve control means controls the relief pressure of the relief valve to a second oil pressure lower than the first oil pressure when the operation mode judging means judges that the operation mode is the backhoe work mode.
- the relief valve is controlled to lower the hydraulic pressure of the hydraulic circuit. For this reason, during work on the backhoe, the load on the hydraulic pump that supplies hydraulic oil to the transmission is reduced. Therefore, fuel consumption can be reduced.
- the backhoe loader according to the second aspect of the present invention is the backhoe loader according to the first aspect, further comprising a driver seat direction detection sensor for detecting the direction of the driver seat, and the work mode determination means includes the driver seat direction detection sensor, By detecting that the seat is facing backward, it is determined that the mode is the backhoe work mode.
- the driver's seat is set backwards. Therefore, when it is detected that the driver's seat is set backward, it is determined that the mode is the backhoe work mode. Here, it can be easily and reliably determined that the mode is the backhoe work mode.
- the work mode determining means further detects that the engine is operating and determines that it is in the backhoe work mode.
- the driver's seat may be set facing backwards even when the engine is not in operation. Therefore, in the backhoe loader on the third side surface, it is determined that the driver's seat is set backward and the engine is in operation, and the backhoe work mode is determined. For this reason, it can be judged more reliably that it is a backhoe work mode.
- the work mode determining means further detects that no hydraulic oil supply command is issued to the hydraulic clutch and is in the backhoe work mode. to decide.
- a backhoe loader is the backhoe loader according to the first aspect, further comprising a driver seat direction detection sensor that detects the direction of the driver's seat, and the work mode determination means includes the driver seat direction detection sensor, By detecting that the seat is not facing backward, it is determined that the backhoe work mode is not set.
- the operator may operate the backhoe with the driver's seat set forward. In such a case, if the hydraulic pressure of the hydraulic oil to the transmission is lowered, problems such as the hydraulic clutch slipping or the hydraulic clutch does not turn on (power transmission) are caused.
- the backhoe loader of the fifth aspect when the driver's seat is not facing backward, it is determined that the backhoe work mode is not set even if the backhoe can be operated. For this reason, it is possible to avoid problems such as the hydraulic clutch of the transmission not being connected.
- a backhoe loader is the backhoe loader according to any one of the first to fifth aspects, wherein the relief valve control means is provided between the hydraulic pump and the relief valve, and is relieved by the hydraulic pressure of the hydraulic circuit.
- a pilot circuit for controlling the valve is included.
- the relief valve control means can be realized with a simple configuration.
- a backhoe loader is the backhoe loader according to the sixth aspect, wherein the pilot circuit drains hydraulic fluid in the hydraulic circuit when the operation mode is other than the backhoe operation mode, and the operation mode is the backhoe operation mode. In the case, it has an unload valve that prohibits the drain of hydraulic oil in the hydraulic circuit.
- FIG. 1 is an external perspective view of a backhoe loader according to an embodiment of the present invention.
- the control flowchart of an unload process. The figure equivalent to FIG. 4 by other embodiment of this invention.
- FIG. 1 shows an external view of a backhoe loader 1 according to an embodiment of the present invention.
- the backhoe loader 1 is a work vehicle that can perform excavation work and loading work by one unit.
- This backhoe loader mainly includes a main body 2, a loader 3, a backhoe 4, and left and right stabilizers 5.
- the main body 2 includes a frame 10 that supports equipment such as an engine and a transmission 6 (see FIG. 2), a cab 11 mounted on the frame 10, and a pair of front wheels 12 and rear wheels 13, respectively.
- equipment such as an engine and a transmission 6 (see FIG. 2)
- a cab 11 mounted on the frame 10
- the diameter of the rear wheel 13 is larger than the diameter of the front wheel 12. Therefore, the axle connected to the front wheel 12 is disposed at a position lower than the position of the axle connected to the rear wheel 13.
- Devices such as the engine and transmission are covered with an outer cover 14.
- a driver's seat 16 on which an operator is seated is provided inside the cab 11. The driver's seat 16 can rotate between a front-facing position and a rear-facing position.
- An operation member for operating the steering, various pedals, the loader 3 and the backhoe 4 is provided inside the cab 11.
- the engine is mounted on the front part of the frame 10.
- the engine drives the front wheels 12 and the rear wheels 13 via a transmission and an axle, and drives a hydraulic pump for operating various hydraulic devices.
- the transmission 6 has a plurality of shafts as shown in FIG. 2, and a hydraulic clutch is provided on each shaft except the rear output shaft.
- the loader 3 is disposed in front of the cab 11 and is a working machine for performing loading work.
- the loader 3 includes a loader arm 20, a bracket 21, a link 22, a loader bucket 23, a bucket cylinder 24, and an arm cylinder 25.
- the loader arm 20 has a base end portion that is rotatably supported by the frame 10 and a loader bucket 23 that is rotatably mounted at the tip.
- the base end of the bracket 21 is rotatably supported by the loader arm 20, and the tip of the rod of the bucket cylinder 24 and one end of the link 22 are rotatably connected to the tip.
- a base end portion of the bucket cylinder 24 is rotatably supported by the frame 10.
- the tip of the link 22 is rotatably connected to the bucket 23.
- the arm cylinder 25 has a base end portion rotatably supported by the frame 10, and a distal end of a rod of the arm cylinder 25 is rotatably connected to an intermediate portion in the longitudinal direction of the loader arm 20.
- the backhoe 4 is disposed behind the cab 11 and is a work machine for performing excavation work.
- the backhoe 4 includes a boom 30, an arm 31, a bucket link 32, a backhoe bucket 33, a boom cylinder 34, an arm cylinder 35, and a bucket cylinder 36.
- the boom 30 is supported by the frame 10 so as to be rotatable in the left-right direction through a bracket (not shown).
- the base end portion of the arm 31 is rotatably connected to the distal end portion of the boom 30, and the backhoe bucket 33 is rotatably connected to the distal end of the arm 31.
- One end of the boom cylinder 34 is rotatably connected to a bracket (not shown) fixed to the frame 10, and the other end is rotatably connected to a boom bracket 37 fixed to the boom 30.
- One end of the arm cylinder 35 is rotatably connected to the boom bracket 37, and the other end is rotatably connected to the base end portion of the arm 31.
- the bucket cylinder 36 has a base end portion rotatably connected to the arm 31 and a tip end rotatably connected to the bucket link 32.
- the boom 30 rotates downward when the rod of the boom cylinder 34 protrudes, and the boom 30 rotates upward when the rod of the boom cylinder 34 retracts.
- the arm 31 rotates downward, and when the rod of the arm cylinder 35 retracts, the arm 31 rotates upward.
- the backhoe bucket 33 rotates via the bucket link 32, and the opening of the backhoe bucket 33 approaches the arm 31.
- the rod of the bucket cylinder 36 moves backward, the backhoe bucket 33 rotates through the bucket link 32, and the opening of the backhoe bucket 33 is separated from the arm 31.
- the backhoe 4 has a bracket cylinder for rotating the boom bracket connecting the boom 30 to the frame 10 in the left-right direction.
- One end of the bracket cylinder is rotatably connected to the frame 10, and the other end is rotatably connected to the boom bracket.
- the left and right stabilizers 5 are used to stabilize the posture of the backhoe loader 1 and prevent it from falling during work by the backhoe 4.
- the left and right stabilizers 5 are provided at the rear left part and the rear right part of the frame 10, respectively.
- the stabilizer 5 is grounded in a state of projecting to the left and right sides of the backhoe loader 1 and the body of the backhoe loader 1 is lifted until the rear wheel 13 is separated from the ground, thereby stabilizing the posture of the backhoe loader 1 during excavation work. Can be made.
- FIG. 2 schematically shows the transmission 6 and the torque converter 40, and also shows a hydraulic pump 50 and a hydraulic circuit 52 for supplying hydraulic oil to them.
- the transmission 6 has a first shaft 41 to a fifth shaft 45 arranged in parallel to each other.
- the first shaft 41 is an input shaft to which power from an engine (not shown) is input.
- Both the second shaft 42 and the third shaft 43 are intermediate shafts.
- the fourth shaft 44 is a front output shaft connected to the front wheel 12.
- the fifth shaft 45 is a rear output shaft connected to the rear wheel 13.
- the first shaft 41 is provided with a hydraulic clutch CL for forward low speed and a hydraulic clutch CR for reverse.
- the second shaft 42 is provided with a hydraulic clutch CH for forward high speed and a hydraulic clutch C1 for first speed.
- the third shaft 43 is provided with a second speed hydraulic clutch C2 and a third speed hydraulic clutch C3.
- the fourth shaft is provided with a hydraulic clutch CS for switching between two-wheel drive and four-wheel drive.
- the torque converter 40 has a known impeller, turbine, and stator, and also has a lock-up clutch LC.
- the hydraulic circuit 52 includes a main relief valve 53, a plurality of electromagnetic proportional control valves ECMV and one electromagnetic control valve ECV, a pilot circuit 55 including an unload valve 54, and a torque converter relief valve 56. Yes.
- the main relief valve 53 is connected to the hydraulic pump 50 through a filter 58.
- the main relief valve 53 controls the hydraulic oil discharged from the hydraulic pump 50 to a predetermined pressure.
- the electromagnetic proportional control valve ECMV and the electromagnetic control valve ECV are provided via a filter 62 in a branch oil passage 61 branched from an oil passage 60 connecting the hydraulic pump 50 and the main relief valve 53.
- the plurality of electromagnetic proportional control valves ECMV supplies hydraulic oil to a plurality of hydraulic clutches CL, CH, CR, C1 to C3 excluding the two-wheel drive / four-wheel drive switching hydraulic clutch CS.
- the electromagnetic control valve ECV supplies hydraulic oil to the two-wheel drive / four-wheel drive switching hydraulic clutch CS.
- the pilot circuit 55 is provided between the branch oil passage 61 and the main relief valve 53.
- the pilot circuit 55 is provided with an unload valve 54 and an orifice 64.
- the unload valve 54 has a solenoid, and the main relief valve 53 is controlled by turning on and off the solenoid.
- the orifice 64 is provided between the unload valve 54 and the branch oil passage 62.
- the torque converter relief valve 56 is provided in an oil passage between the main relief valve 53 and the torque converter 40 and controls the hydraulic pressure of the torque converter 40.
- hydraulic oil branched before the torque converter 40 or the hydraulic oil discharged from the torque converter 40 is supplied as lubricating oil to each of the shafts 41 to 45 through an oil passage for lubricating oil.
- the backhoe loader 1 has a control unit 70 as shown in FIG.
- the control unit 70 includes an engine speed detection sensor 71 for detecting whether or not the engine is in operation, a driver seat direction detection sensor 72 for detecting whether the driver seat is facing forward or backward, A position detection sensor 73 for the travel operation member is connected.
- the travel detection member position detection sensor 73 includes sensors for detecting the positions of the forward / reverse switching operation member, the two-wheel drive / four-wheel drive switching operation member, the shift speed switching lever, and the like.
- the electromagnetic proportional control valve ECMV, the electromagnetic control valve ECV, and the unload valve 54 are connected to the control unit 70.
- the control unit 70 receives signals from the sensors, and outputs control signals to the electromagnetic proportional control valves ECMV, the electromagnetic control valve ECV, and the unload valve 54 to the shafts 41 to 44 of the transmission 6.
- the plurality of hydraulic clutches provided are controlled on / off and the unload valve 54.
- FIG. 4 shows a flowchart for executing the unloading process, that is, the process for reducing the hydraulic pressure of the hydraulic circuit during the backhoe operation.
- the unload processing will be described based on this flowchart.
- the command is not output from the control unit 70 to the solenoid of the unload valve 54 when the operation mode is not the backhoe operation mode.
- the solenoid of the unload valve 54 is off and the spool is located at the A stage.
- the hydraulic pressure (for example, 20 kg / cm 2 ) set by the main relief valve 53 is set on the branch oil passage 61 side of the orifice 64.
- the hydraulic oil is connected to the drain 66 through the unloading valve 54, so that substantially no hydraulic pressure acts on the spool of the main relief valve 53. For this reason, the hydraulic circuit 52 is maintained at the hydraulic pressure set by the main relief valve 53.
- step S1 it is determined in step S1 based on the detection signal from the engine speed detection sensor 71 whether or not the engine is operating.
- step S ⁇ b> 2 whether or not the driver's seat is facing backward is determined based on a detection signal from the driver's seat orientation detection sensor 72.
- a limit switch or a proximity switch is used as the driver seat direction detection sensor 72, but in this case, it is necessary to define the rear direction by designating an angle.
- step S3 If YES is determined in each of the above steps S1 and S2, the process proceeds to step S3, and an ON command is output to the solenoid of the unload valve 54.
- the unload valve 54 moves to the B stage.
- the connection of the pilot circuit 55 to the drain 66 is cut off. Therefore, the hydraulic pressure of the hydraulic circuit 52 instantaneously acts on the main relief valve 53 through the pilot circuit 55. Thereby, the spool of the main relief valve 53 moves, and the main relief valve 53 is opened. Therefore, the hydraulic pressure of the hydraulic circuit 52 becomes the hydraulic pressure corresponding to the resistance of the hydraulic circuit provided downstream from the main relief valve 53, and the load on the hydraulic pump 50 is significantly reduced.
- step S4 the solenoid of the unload valve 54 is turned off, whereby the unload valve 54 shifts to the A stage. Therefore, as described above, the hydraulic circuit 52 is set to the hydraulic pressure set by the main relief valve 53 (for example, 20 kg / cm 2 ).
- the operator may operate the backhoe with the driver's seat set forward.
- the backhoe is selected by a switch that selects either the loader bucket or the backhoe.
- the driver's seat is set forward, even if the backhoe can be operated, the backhoe work cannot be performed in earnest, and it is not in the backhoe work mode.
- the driver's seat direction detection sensor 72 can also detect the front direction of the driver's seat, and when detecting that the driver's seat is facing forward, the backhoe loader can be driven. Therefore, in the present embodiment, the hydraulic oil pressure to the transmission is reduced only when the rearward direction of the driver's seat is detected, so that the hydraulic clutch slips or the hydraulic clutch is turned on (power transmission). ) So that there are no problems with driving. In other words, if the driver's seat direction detection sensor 72 detects that the driver's seat direction is not rearward of the driver's seat (that is, detects that the detected value is OFF), it is determined that the mode is not the backhoe work mode, and the operation to the transmission is performed. The oil pressure of the oil is not lowered.
- the pilot circuit 55 is provided between the hydraulic pump 50 and the main relief valve 53 to control the main relief valve 53, the main relief valve 53 can be controlled with a simple configuration.
- the pilot circuit is provided to control the main relief valve, but the configuration for controlling the main relief valve is not limited to this embodiment.
- the conditions for determining the backhoe work mode are not limited to the above embodiment.
- a condition that a hydraulic clutch on command is not output from the control unit to the electromagnetic proportional control valve and the electromagnetic control valve may be added.
- a control flowchart in this case is shown in FIG.
- step S1 and step S2 YES is determined under the same conditions as in FIG. 4 (step S1 and step S2), and it is determined at step S5 that the hydraulic clutch ON command is not output to the electromagnetic proportional control valve ECMV and the electromagnetic control valve ECV. If so, the same step S3 as described above is executed. Even if YES is determined in steps S1 and S2, step S3 is not executed if a hydraulic clutch on command is output to the electromagnetic proportional control valve ECMV and the electromagnetic control valve ECV.
- the hydraulic pressure of the hydraulic oil to the transmission is reduced only when the driver seat direction detection sensor 72 detects the rear direction of the driver seat, but the driver seat direction detection sensor 72 indicates the front direction of the driver seat.
- the hydraulic pressure of hydraulic oil to the transmission may not be reduced.
- the driver's seat orientation detection sensor 72 detects that the driver's seat is not facing backward, it is determined that it is not in the backhoe work mode, and the hydraulic oil pressure to the transmission It can be said that it is not lowered.
- the driver's seat direction detection sensor 72 detects that the driver's seat is not rearward at a predetermined intermediate angle position between the driver's seat rearward and frontward, and detects that the driver's seat is not rearward, It may be determined that the operation mode is not the backhoe operation mode, and the hydraulic pressure of the hydraulic oil to the transmission may not be reduced.
- the backhoe loader of the present invention it is possible to reduce the load on the hydraulic pump, particularly during backhoe work, and to reduce fuel consumption.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
図1に本発明の一実施形態によるバックホーローダ1の外観図を示している。バックホーローダ1は、1台で掘削作業及び積み込み作業を行うことができる作業車両である。このバックホーローダは主に、本体2と、ローダ3と、バックホー4と、左右のスタビライザ5と、を備えている。
図2に、トランスミッション6及びトルクコンバータ40を模式的に示すとともに、これらに作動油を供給するための油圧ポンプ50及び油圧回路52を示している。
このバックホーローダ1は、図3に示すように、制御部70を有している。制御部70には、エンジンが稼働中であるか否かを検出するためのエンジン回転数検出センサ71、運転席が前方向きであるか後方向きであるかを検出する運転席向き検出センサ72、走行用操作部材の位置検出センサ73が接続されている。走行用操作部材の位置検出センサ73は、前進・後進切換用操作部材、2輪駆動・4輪駆動切換用操作部材、変速段切換用変速レバー等の位置をそれぞれ検出するセンサを含んでいる。また、制御部70には、各電磁比例制御弁ECMV及び電磁制御弁ECV、アンロード弁54が接続されている。そして、制御部70は、各センサからの信号を受けて、各電磁比例制御弁ECMV及び電磁制御弁ECVと、アンロード弁54とに制御信号を出力し、トランスミッション6の各軸41~44に設けられた複数の油圧クラッチのオン/オフ、アンロード弁54を制御する。
図4に、アンロード処理、すなわち、バックホー作業時に、油圧回路の油圧を低下させるための処理を実行するためのフローチャートを示している。以下、このフローチャートに基づいてアンロード処理について説明する。
(1)バックホー4を使用した作業を行っていると判断された場合は、メインリリーフ弁53を制御して、油圧回路52の油圧を低下させている。このため、バックホー4での作業中は、油圧ポンプ50の負荷が低減されて燃費を低減することができる。
本発明は以上のような実施形態に限定されるものではなく、本発明の範囲を逸脱することなく種々の変形又は修正が可能である。
3 ローダ
4 バックホー
6 トランスミッション
11 運転室
12 前輪
13 後輪
16 運転席
50 油圧ポンプ
52 油圧回路
52を示している。
53 メインリリーフ弁
54 アンロード弁
55 パイロット回路
70 制御部
71 エンジン回転数検出センサ
72 運転席向き検出センサ
CL,CH,CR,C1~C3 油圧クラッチ
Claims (7)
- 1つ以上の油圧クラッチを有するトランスミッションと、
前方向き及び後方向きの2位置を取り得る運転席を有する運転室と、
前記運転室の前方に設けられたローダと、
前記運転室の後方に設けられたバックホーと、
前記油圧クラッチに作動油を供給するための油圧ポンプと、
回路内の油圧を第1油圧に設定するためのリリーフ弁を有し、前記油圧ポンプからの作動油を前記油圧クラッチに供給する油圧回路と、
運転モードが前記バックホーを使用したバックホー作業モードであるか否かを判断する作業モード判断手段と、
前記作業モード判断手段により、運転モードがバックホー作業モードであると判断されたとき、前記リリーフ弁のリリーフ圧を前記第1油圧より低い第2油圧に制御するリリーフ弁制御手段と、
を備えたバックホーローダ。 - 運転席の向きを検出する運転席向き検出センサをさらに備え、
前記作業モード判断手段は、前記運転席向き検出センサが、運転席が後方向きであることを検出することで、バックホー作業モードであると判断する、請求項1に記載のバックホーローダ。 - 前記作業モード判断手段は、さらに前記エンジンが稼働中であることを検出してバックホー作業モードであると判断する、請求項2に記載のバックホーローダ。
- 前記作業モード判断手段は、さらに前記油圧クラッチに作動油の供給指令がなされていないことを検出してバックホー作業モードであると判断する、請求項3に記載のバックホーローダ。
- 運転席の向きを検出する運転席向き検出センサをさらに備え、
前記作業モード判断手段は、前記運転席向き検出センサが、運転席が後方向きでないことを検出することで、バックホー作業モードでないと判断する、請求項1に記載のバックホーローダ。 - 前記リリーフ弁制御手段は、前記油圧ポンプと前記リリーフ弁との間に設けられ、前記油圧回路の油圧によって前記リリーフ弁を制御するパイロット回路を有している、請求項1から5のいずれかに記載のバックホーローダ。
- 前記パイロット回路は、運転モードがバックホー作業モード以外の場合は前記油圧回路の作動油をドレインし、運転モードがバックホー作業モードの場合は前記油圧回路の作動油のドレインを禁止するアンロード弁を有している、請求項6に記載のバックホーローダ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2012800012968A CN103109024A (zh) | 2011-08-08 | 2012-04-18 | 反向铲装载机 |
US13/817,204 US8483917B2 (en) | 2011-08-08 | 2012-04-18 | Backhoe loader |
GB1221542.2A GB2496763B (en) | 2011-08-08 | 2012-04-18 | Backhoe Loader |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011172751A JP5106662B1 (ja) | 2011-08-08 | 2011-08-08 | バックホーローダ |
JP2011-172751 | 2011-08-08 |
Publications (1)
Publication Number | Publication Date |
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WO2013021692A1 true WO2013021692A1 (ja) | 2013-02-14 |
Family
ID=47528539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2012/060456 WO2013021692A1 (ja) | 2011-08-08 | 2012-04-18 | バックホーローダ |
Country Status (5)
Country | Link |
---|---|
US (1) | US8483917B2 (ja) |
JP (1) | JP5106662B1 (ja) |
CN (1) | CN103109024A (ja) |
GB (1) | GB2496763B (ja) |
WO (1) | WO2013021692A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2498247A (en) * | 2011-11-30 | 2013-07-10 | Deere & Co | Work vehicle with charge pressure reduction circuit which improves transmission efficiency |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2525190A (en) * | 2014-04-14 | 2015-10-21 | Jc Bamford Excavators Ltd | A vehicle |
US10443699B2 (en) * | 2017-05-26 | 2019-10-15 | Cnh Industrial America Llc | Hydraulic torque converter for work machine |
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US6923285B1 (en) * | 2000-02-01 | 2005-08-02 | Clark Equipment Company | Attachment control device |
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JP4734196B2 (ja) * | 2006-08-10 | 2011-07-27 | 日立建機株式会社 | 大型油圧ショベルの油圧駆動装置 |
US20090171482A1 (en) * | 2007-12-31 | 2009-07-02 | Spencer Mindeman | Attachment controller |
JP5368752B2 (ja) * | 2008-09-02 | 2013-12-18 | ヤンマー株式会社 | 作業車両の油圧回路 |
JP5528276B2 (ja) * | 2010-09-21 | 2014-06-25 | 株式会社クボタ | 作業機の油圧システム |
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- 2011-08-08 JP JP2011172751A patent/JP5106662B1/ja not_active Expired - Fee Related
-
2012
- 2012-04-18 WO PCT/JP2012/060456 patent/WO2013021692A1/ja active Application Filing
- 2012-04-18 GB GB1221542.2A patent/GB2496763B/en not_active Expired - Fee Related
- 2012-04-18 US US13/817,204 patent/US8483917B2/en not_active Expired - Fee Related
- 2012-04-18 CN CN2012800012968A patent/CN103109024A/zh active Pending
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JPH0379369U (ja) * | 1990-10-12 | 1991-08-13 | ||
WO2006098085A1 (ja) * | 2005-03-14 | 2006-09-21 | Yanmar Co., Ltd. | 作業車両の油圧回路構造 |
WO2009116249A1 (ja) * | 2008-03-21 | 2009-09-24 | 株式会社小松製作所 | 作業車両、作業車両の制御装置、及び作業車両の作動油量制御方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2498247A (en) * | 2011-11-30 | 2013-07-10 | Deere & Co | Work vehicle with charge pressure reduction circuit which improves transmission efficiency |
US8528684B2 (en) | 2011-11-30 | 2013-09-10 | Deere & Company | Charge pressure reduction circuit for improved transmission efficiency |
GB2498247B (en) * | 2011-11-30 | 2014-12-31 | Deere & Co | Charge pressure reduction circuit for improved transmission efficiency |
Also Published As
Publication number | Publication date |
---|---|
US8483917B2 (en) | 2013-07-09 |
JP2013036220A (ja) | 2013-02-21 |
US20130144496A1 (en) | 2013-06-06 |
GB2496763A (en) | 2013-05-22 |
GB2496763B (en) | 2013-10-23 |
JP5106662B1 (ja) | 2012-12-26 |
CN103109024A (zh) | 2013-05-15 |
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