EP2687638A1 - Rotor de roue - Google Patents

Rotor de roue Download PDF

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Publication number
EP2687638A1
EP2687638A1 EP12758204.7A EP12758204A EP2687638A1 EP 2687638 A1 EP2687638 A1 EP 2687638A1 EP 12758204 A EP12758204 A EP 12758204A EP 2687638 A1 EP2687638 A1 EP 2687638A1
Authority
EP
European Patent Office
Prior art keywords
control lever
arm
bucket
mode
grip
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.)
Granted
Application number
EP12758204.7A
Other languages
German (de)
English (en)
Other versions
EP2687638A4 (fr
EP2687638B1 (fr
Inventor
Koji Hyodo
Masaki Yoshikawa
Ei Takahashi
Wataru Isaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KCM Corp
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Publication of EP2687638A1 publication Critical patent/EP2687638A1/fr
Publication of EP2687638A4 publication Critical patent/EP2687638A4/fr
Application granted granted Critical
Publication of EP2687638B1 publication Critical patent/EP2687638B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • E02F3/283—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 with a single arm pivoted directly on the chassis
    • 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
    • E02F3/34—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 with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • 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
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • 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
    • E02F9/02—Travelling-gear, e.g. associated with slewing gears
    • 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
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • E02F9/2066—Control of propulsion units of the type combustion engines
    • 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
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2079—Control of mechanical transmission
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks

Definitions

  • the present invention relates to a wheel loader that scoops up and moves excavated material.
  • Work implements of wheel loaders generally include an arm cylinder that elevates an arm and a bucket cylinder that dumps or crowds a bucket.
  • a known wheel loader includes, as control mechanisms for directing operations of the arm cylinder and the bucket cylinder, two control levers for operating the arm and the bucket, respectively.
  • the two control levers may, for example, be disposed on the right-hand side in the cabin (hereinafter referred to as an "arm control lever” and a “bucket control lever”) (see, for example, patent document 1).
  • Patent document 1 discloses a wheel loader arrangement that includes a kickdown switch for quickly effecting a downshift and a mode changeover switch for temporarily canceling a restriction on the engine maximum speed and thereby increasing the maximum running driving force (changing the running mode), the kickdown switch being disposed at an upper portion of an arm control lever and the mode changeover switch being disposed at an upper portion of a bucket control lever, respectively.
  • This arrangement enables a required large running driving force to be obtained by operating the kickdown switch to shift down to a lower shift speed when the operation is changed from (A) to (B), and an even larger running driving force to be produced by operating the mode changeover switch as appropriate according to the situation upon the operation of (C).
  • the control operation to be performed during the operation of (B) is adjusting posture of the bucket and downshifting. These control operations are to be performed preliminary to the excavating, requiring no delicate adjustments as the work progresses.
  • the control operations can be performed fairly easily with the operator resting his or her hand only lightly on the arm control lever. How the arm control lever is gripped varies depending on each individual operator. One may firmly grip the arm control lever or rest his or her hand lightly thereon, or grip the arm control lever from above or from a side.
  • the control operation to be performed during the operation of (C) is to crowd the bucket and, in parallel therewith, advance the wheel loader, while raising the arm.
  • the greater the maximum running driving force is not necessarily the better.
  • a large running driving force may be required for penetrating the bucket into the material to be excavated; meanwhile, if the wheel loader is made to run with an excessively large running driving force when running load of the excavated material is heavy, the wheels may slip to gouge the road surface, affecting subsequent work.
  • the maximum running driving force needs to be increased as necessary and, at the same time, the foregoing situation is properly avoided.
  • the present invention has been made in view of the foregoing situation and in consideration of the present situation of control operations performed by an operator from a viewpoint of user friendliness and it is an object of the present invention to provide a wheel loader that can improve control operability.
  • the present invention can achieve even better operability by flexibly disposing the kickdown switch and the mode changeover switch according to different modes of operation of the operator.
  • Fig. 1 is a side elevational view showing a wheel loader according to an embodiment of the present invention.
  • a wheel loader 100 shown in Fig. 1 includes a vehicle body 110 and a work implement 120 mounted at a front portion of the vehicle body 101.
  • the vehicle body 110 includes a front vehicle body 111 and a rear vehicle body 112.
  • the front vehicle body 111 and the rear vehicle body 112 include a front wheel (tire) 113 and a rear wheel (tire) 114, respectively.
  • the front vehicle body 111 and the rear vehicle body 112 are mutually bendably connected to each other via a center pin 115 extending in a vertical direction.
  • the front vehicle body 111 and the rear vehicle body 112 are connected to a steering cylinder, not shown. With a telescopic drive of the steering cylinder, the front vehicle body 111 bends to the right or left relative to the rear vehicle body 112.
  • a cabin 116 is mounted at a front portion on the rear vehicle body 112 and an engine compartment 117 is mounted at a rear portion on the rear vehicle body 112.
  • Fig. 2 is a block diagram showing a schematic configuration of a drive system of the wheel loader 100.
  • the drive system 130 of the wheel loader 100 includes the engine 131, a torque converter 132, a transmission 133, the hydraulic pump 134, the control valve 135, a controller 136, an engine control unit 137, and a transmission control unit 138.
  • the hydraulic pump 134 is a variable displacement type driven by the engine 131 to deliver hydraulic fluid.
  • the hydraulic fluid delivered from the hydraulic pump 134 while having its direction and flow rate controlled by the control valve 135, is supplied to work actuators, such as the arm cylinder 123 and the bucket cylinder 124, thereby driving the work actuators.
  • the control valve 135 is operated by an arm control lever 11 and a bucket control lever 12 (to be described later).
  • the control valve 135 controls flow of the hydraulic fluid to the arm cylinder 123 or the bucket cylinder 124 according to an operation signal from the arm control lever 11 or the bucket control lever 12.
  • the hydraulic pump 134 has a pump capacity varied by a regulator (not shown). The regulator varies the pump capacity according to the pump delivery pressure to thereby perform, for example, constant torque control in which work torque remains constant. It is noted that a fixed displacement pump, such as a gear pump, may be used for the hydraulic pump 134.
  • the controller 136 is configured to include an arithmetic processing unit that includes a CPU, a ROM, a RAM, and other peripheral circuits.
  • the controller 136 receives inputs of signals from an accelerator operation amount detector 143, a vehicle speed detector 144, a speed detector 145, a speed detector 146, a forward/reverse changeover switch 14, a shift speed position switch 15, kickdown switches 16, 17, a main mode changeover switch 18 (hereinafter referred to as a "main switch 18"), and a sub-mode changeover switch 19 (hereinafter referred to as a "sub-switch 19").
  • the accelerator operation amount detector 143 detects an operation amount of an accelerator pedal 13.
  • the vehicle speed detector 144 detects a rotational speed of the output shaft of the transmission 133 (or the propeller shaft 141) as a vehicle speed.
  • the speed detector 145 detects a rotational speed Ni of the input shaft of the torque converter 132.
  • the speed detector 146 detects a rotational speed Nt of the output shaft of the torque converter 132.
  • the forward/reverse changeover switch 14 selects a forward mode (F), a reverse mode (R), or a neutral mode (N) of the wheel loader 100.
  • the shift speed position switch 15 specifies an upper limit of a shift speed position among 1st to 4th speeds.
  • the kickdown switches 16, 17 direct a changeover of the shift speed to a lower speed.
  • the main switch 18 selects a running mode of either a power mode (hereinafter referred to as a "P mode”) in which emphasis is placed on workability or an economy mode (hereinafter referred to as an "E mode”) in which emphasis is placed on fuel economy.
  • P mode a power mode
  • E mode economy mode
  • the sub-switch 19 also selects the running mode of either the P mode or the E mode.
  • each of the kickdown switches 16, 17 and the sub-switch 19 is a pushbutton switch having therein predetermined play.
  • the switch is designed to have a certain allowance so as not to output the operation signal unless the switch is depressed a required stroke.
  • the torque converter 132 has a function of increasing output torque relative to input torque, specifically, having a torque ratio of 1 or more.
  • the torque ratio decreases with an increase in a torque converter speed ratio e (output rotational speed Nt/input rotational speed Ni), specifically, a ratio of the rotational speed of the input shaft to that of the output shaft of the torque converter 132.
  • e output rotational speed ratio
  • the output rotational speed Nt of the torque converter 132 specifically, the vehicle speed decreases with a resultant small torque converter speed ratio e. Since the torque ratio increases at this time, the vehicle can run with an even greater running driving force (traction force). Specifically, a low vehicle speed results in an increasing running driving force (low speed high torque) and a high vehicle speed results in a decreasing running driving force (high speed low torque).
  • the transmission 133 is an automatic transmission having a clutch and a solenoid valve associated with each shift speed position of the 1st to 4th speeds.
  • Each of the solenoid valves is driven by a control signal output from the controller 136 to the transmission control unit 138, causing hydraulic fluid to act on a corresponding clutch to thereby change a clutch position.
  • the controller 136 stores in advance therein a torque converter speed ratio e1 that serves as a reference for upshifting and a torque converter speed ratio e2 that serves as a reference for downshifting.
  • the controller 136 calculates the torque converter speed ratio e using signals from the speed detectors 145, 146.
  • the controller 136 If the calculated torque converter speed ratio e is greater than the torque converter speed ratio e1, the controller 136 outputs an upshift signal to the transmission control unit 138. If the calculated torque converter speed ratio e is smaller than the torque converter speed ratio e2, the controller 136 outputs a downshift signal to the transmission control unit 138. This allows the shift speed position of the transmission 133 to be automatically changed among the 1st to 4th speeds according to the torque converter speed ratio e.
  • the shift speed position is automatically changed with the shift speed position selected with the shift speed position switch 15 as the upper limit.
  • the shift speed position is either the 1st speed or the 2nd speed according to the torque converter speed ratio e. If the 1st speed is selected with the shift speed position switch 15, the shift speed position is fixed at the 1st speed.
  • the arrangement may include a function that changes from the automatic transmission mode to a manual transmission mode and, in the manual transmission mode, the shift speed position switch 15 or another separately provided switch may be manually operated to select any shift speed position.
  • an upshift or a downshift is effected when the torque converter speed ratio e is greater or smaller than the predetermined value e1 or e2.
  • a gearshift may even be effected when the vehicle speed reaches a predetermined value.
  • Such an arrangement can be achieved by, for example, causing an upshift signal or a downshift signal to be output to the transmission control unit 138 according to a signal from the vehicle speed detector 144.
  • the controller 136 also brings the engine speed to a target engine speed according to the operation amount of the accelerator pedal 13. Specifically, a greater depression amount of the accelerator pedal 13 results in an increased target engine speed and the controller 136 outputs a control signal corresponding to the target engine speed, thereby controlling the engine speed.
  • Fig. 3 is a running performance diagram (torque diagram) showing a relation between the engine speed and torque when the accelerator pedal 13 is fully depressed.
  • characteristics Ap and Ae are torque diagrams when the running mode is the P mode and the E mode, respectively. Whereas the engine maximum speed is not limited in the P mode, the engine maximum speed is limited in the E mode to a point on the low speed side.
  • Characteristics B0 to B2 are exemplary input torque values when the transmission 133 is driven by the engine 131, indicating that the input torque increases with an increasing engine speed.
  • This input torque includes input torque of the hydraulic pump 134 and varies as shown by the characteristics B0 to B2 according to the torque converter speed ratio e and suction torque of the hydraulic pump 134. Specifically, a smaller torque converter speed ratio e results in greater input torque (the characteristic B0) and a greater torque converter speed ratio e results in smaller input torque (the characteristic B2).
  • Fig. 4 is a graph showing a relation between the vehicle speed and the running driving force at each of different shift speeds.
  • solid lines represent characteristics in the P mode and dotted lines represent characteristics in the E mode.
  • a comparison made at the same shift speed in Fig. 4 reveals that the running driving force is greater at a lower vehicle speed (low speed high torque) and smaller at a higher vehicle speed (high speed low torque). Additionally, the lower the shift speed position, the greater the running driving force obtained at the same vehicle speed. Specifically, the maximum running driving force is greater and the maximum vehicle speed is higher in the P mode than in the E mode. At the 2nd speed position, for example, a maximum running driving force F2 in the P mode is greater than a maximum running driving force F2' in the E mode and a maximum vehicle speed V2hi in the P mode is higher than a maximum vehicle speed V2'hi in the E mode.
  • Fig. 5 is a plan view showing a configuration of the cabin 116.
  • a side console panel 22 and a work implement control device 20 are disposed on the right of a driver's seat 21.
  • a front panel 23 forward of the driver's seat 21 includes a steering wheel 27, the forward/reverse changeover switch 14, and a monitor panel 24.
  • the monitor panel 24 includes a display 25 that indicates whether the E mode or the P mode is selected.
  • the forward/reverse changeover switch 14 has the shift speed position switch 15 disposed at a leading end thereof.
  • the accelerator pedal 13 and right and left brake pedals 26 are disposed forwardly of the driver's seat 21 and downwardly of the front panel 23.
  • the abovementioned mode changeover main switch 18 (see Fig. 6 also) is disposed on the side console panel 22.
  • the main switch 18 is an alternate switch that is placed in either a P position indicating the P mode or an E position indicating the E mode.
  • the work implement control device 20 is disposed forwardly of the side console panel 22.
  • the work implement control device 20 includes the bucket control lever 12 that directs an operation of the bucket cylinder 124, the arm control lever 11 that directs an operation of the arm cylinder 123, the sub-switch 19 that selects either the E mode or the P mode, the two modes having an engine maximum speed upper limit value different from each other, and the two kickdown switches 16, 17 that forcibly effect a downshift.
  • Fig. 7 is a schematic rear elevational view showing an appearance of the work implement control device 20.
  • the arm control lever 11 is in juxtaposition on the right with the bucket control lever 12 disposed on the right-hand side of the driver's seat 21.
  • the kickdown switches 16, 17 described earlier are disposed at an upper surface (apex) and a left side surface (the side surface on the side of the driver's seat 21) of a grip 11a of the arm control lever 11.
  • the mode changeover sub-switch 19 described earlier is disposed at a left side surface (the side surface on the side of the driver's seat 21) of a grip 12a of the bucket control lever 12.
  • the sub-switch 19 may be disposed at an upper surface of the grip 12a of the bucket control lever 12 instead of, or in addition to, the left side surface of the grip 12a of the bucket control lever 12 (specifically, the sub-switch 19 may be disposed only at the upper surface (apex) of the grip 12a, or at the upper surface and the left side surface of the grip 12a as with the kickdown switches 16, 17).
  • the arm control lever 11 further includes a detent mechanism 11b (schematically shown in Fig. 2 ) that maintains posture at a position at which an arm raising operation is directed.
  • the kickdown switches 16, 17 and the sub-switch 19 are each a pushbutton switch and, in this embodiment, are each an alternate pushbutton.
  • the controller 136 outputs a downshift signal to the transmission control unit 138 according to the operation signal and a downshift is effected one speed position each to a lower speed. If either one of the kickdown switches 16, 17 is operated at the 1st shift, the shift speed position selected with the shift speed position switch 15 is reselected.
  • the depression of the sub-switch 19 during running causes the controller 136 to output a mode changeover signal to the engine control unit 137, thus changing the running mode to the P mode. If the sub-switch 19 is then depressed a second time, the running mode is returned to the E mode.
  • the maximum speed of the engine 131 is limited to the low speed side, so that the maximum running driving force and the maximum vehicle speed are limited, thus improving fuel economy. Thereafter, too, each time the sub-switch 19 is operated with the main switch 18 in the E position, the running mode is repeatedly changed to the P mode, the E mode, the P mode,..
  • Fig. 8 is a schematic view showing how material to be excavated, such as sand and gravel, is scooped up during loading of the material onto, for example, a dump truck using the wheel loader 100.
  • the wheel loader 100 moves forward at, for example, the 2nd speed toward a mound P of the material to be excavated (hereinafter referred to simply as the "mound P") and approaches the mound P.
  • the main switch 18 is placed in the E position and the E mode is selected for the running mode.
  • the arm control lever 11 and the bucket control lever 12 are operated to lower the arm 121 and face an open mouth of the bucket 122 forward; immediately before penetration into the mound P, the kickdown switch 16 or 17 is depressed to kick down from the 2nd speed to the 1st speed.
  • the kickdown to the 1st speed is to allow a large running driving force required for loading the material in the bucket 122 to be extracted.
  • the arm raising operation is retained using the detent mechanism 11b of the arm control lever 11. This allows the arm 121 to continue performing the arm raising operation even when the operator releases the arm control lever 11.
  • the bucket control lever 12 is operated to crowd the bucket 122 to thereby scoop up and capture the material to be excavated in the bucket 122.
  • the amount of depression of the accelerator pedal 13 is appropriately varied to thereby adjust the running driving force (traction force). It is to be noted at this time that the running driving force may be better to be held below a predetermined level or increased to a greater level depending on the property of the material to be excavated or the road surface condition during the scooping and capturing operation.
  • the operator thus needs to scoop and capture the material to be excavated in the bucket 122 by selecting the E mode or the P mode as appropriate depending on the situation to prevent the road surface from being gouged by a slipping wheel.
  • the operator (D) operates the forward/reverse changeover switch 14 to select a reverse motion and reverses to be moved away from the mound P; the operator then reselects a forward motion to move to a location near a dump truck (not shown) and, operating the arm control lever 11 and the bucket control lever 12, dumps the material into, for example, a cargo deck of the dump truck.
  • the selection of the E mode or the P mode as the running mode is displayed on the display 25 forward of the driver's seat 21 by a display signal output from the controller 136 based on an operation signal from the main switch 18 and the sub-switch 19.
  • the embodiment can achieve the following effects.
  • the depression of the sub-switch 19 allows the running mode to be changed to the P mode. This eliminates the need for releasing the work implement control device 20 and operating the main switch 18 of the side console panel 22 to thereby select the P mode during the excavating operation. This achieves good workability.
  • the depression of the sub-switch 19 allows the running mode to be instantly changed to the P mode regardless of the shift speed position. This is useful when, for example, increasing the running driving force temporarily during running on an uphill road at the 2nd speed.
  • a second operation on the sub-switch 19 can return the running mode back to the E mode. The operator can therefore change the running mode as desired with the main switch 18 left in the E position. Mode changing operations can thus be performed promptly and easily and the running driving force can be flexibly controlled.
  • the bucket control lever 12 is disposed on the left-hand side near the operator, and the arm control lever 11 is disposed on the right-hand side farther away from the operator;
  • the kickdown switches 16, 17 for forcibly effecting a downshift are disposed at the upper surface and the left side surface (specifically, the side surface closer to the driver's seat), respectively, of the grip 11a of the arm control lever 11, to thereby allow either one of the kickdown switches 16, 17 to be operated for performing the kickdown operation.
  • the kickdown switch 17 disposed at the left side surface of the grip 11a can be more easily operated with the thumb of the right hand that is located on the left side of the grip 11a; if the grip 11a is gripped from a side (the right-hand side), the kickdown switch 16 disposed at the upper surface of the grip 11a can be more easily operated with the thumb of the right hand. Disposing the two kickdown switches 16, 17 on the upper surface and the left side surface, respectively, of the grip 11a of the arm control lever 11 as described above enables a downshift operation to be performed easily regardless of how the grip 11a is gripped.
  • the sub-switch 19 disposed at the left side surface of the grip 12a facilitates a running mode changeover operation to be performed with the thumb of the right hand placed on the grip 12a.
  • the embodiment can improve operability even further.
  • a need may arise to increase the running driving force temporarily as when, for example, climbing an uphill road during running at times other than the excavating work when the work implement control device 20 is not to be operated.
  • the running mode changeover operation can be performed easily even at such a time, because the mode changeover sub-switch 19 is disposed on the bucket control lever 12 that is closer to the operator. This is useful for achieving good operability.
  • the embodiment has been described so that the speed detectors 145, 146 detect the torque converter speed ratio e; however, the speed ratio detecting device may have any configuration.
  • the rotation of the engine 131 has been described to be transmitted to the front wheel 113 and the rear wheel 114 via the torque converter 132, the transmission 133, the propeller shaft 141, and the axles 142.
  • the mechanism for transmitting the running driving force may nonetheless have any configuration.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Operation Control Of Excavators (AREA)
  • Component Parts Of Construction Machinery (AREA)
EP12758204.7A 2011-03-15 2012-03-15 Rotor de roue Active EP2687638B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011057076 2011-03-15
PCT/JP2012/056714 WO2012124767A1 (fr) 2011-03-15 2012-03-15 Rotor de roue

Publications (3)

Publication Number Publication Date
EP2687638A1 true EP2687638A1 (fr) 2014-01-22
EP2687638A4 EP2687638A4 (fr) 2014-12-17
EP2687638B1 EP2687638B1 (fr) 2017-05-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12758204.7A Active EP2687638B1 (fr) 2011-03-15 2012-03-15 Rotor de roue

Country Status (6)

Country Link
US (1) US20140003900A1 (fr)
EP (1) EP2687638B1 (fr)
JP (1) JP5814258B2 (fr)
KR (1) KR101882406B1 (fr)
CN (1) CN103370479B (fr)
WO (1) WO2012124767A1 (fr)

Cited By (1)

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JP6587279B2 (ja) * 2015-07-03 2019-10-09 キャタピラー エス エー アール エル 建設機械における走行制御システム
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JP6487822B2 (ja) * 2015-11-05 2019-03-20 ヤンマー株式会社 トラクタ
CN108301457B (zh) * 2018-03-14 2021-02-19 华侨大学 一种挖掘机启停控制方法
JP6806726B2 (ja) * 2018-03-27 2021-01-06 日立建機株式会社 作業車両
WO2020003948A1 (fr) * 2018-06-29 2020-01-02 株式会社クボタ Machine de travail
CN109515537B (zh) * 2018-11-16 2020-06-09 中联重科股份有限公司 履带式车辆行走机构的控制方法、系统及履带式车辆
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CN112982538B (zh) * 2021-02-24 2022-06-21 索特传动设备有限公司 一种轮式装载机的控制方法、装置、轮式装载机及存储介质
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Publication number Publication date
KR101882406B1 (ko) 2018-07-26
KR20140051120A (ko) 2014-04-30
EP2687638A4 (fr) 2014-12-17
CN103370479B (zh) 2016-06-01
JPWO2012124767A1 (ja) 2014-07-24
EP2687638B1 (fr) 2017-05-10
JP5814258B2 (ja) 2015-11-17
CN103370479A (zh) 2013-10-23
WO2012124767A1 (fr) 2012-09-20
US20140003900A1 (en) 2014-01-02

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