Work vehicle

Abstract

To provide a work vehicle that can achieve work efficiency by facilitating an operator's operations on a drive source to generate an output strength suited for a work device attached to the work vehicle.SOLUTION: A work vehicle includes: a machine body; drive sources (29, 31) provided on the machine body; an attachment unit which can attach and detach various work devices W to and from the machine body; and a control unit 40 which controls an output strength of motive power from the drive source (29, 31) to the work device attached to the attachment unit. The control unit 40 has a plurality of output modes with different output strengths and includes a mode selecting unit 41 that selects the output mode to be used from the plurality of output modes.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a work vehicle capable of mounting a work device capable of performing ground work using power from a drive source such as a battery. [Background technology]

[0002] An example of the above-mentioned work vehicle is described in Patent Document 1. Examples of work devices that can be attached to such a work vehicle and that can perform ground work using power from a drive source include a front loader, a mower, and a rotary. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-108214 A Summary of the Invention [Problem to be solved by the invention]

[0004] In such a working device, the optimum power intensity transmitted from the drive source varies depending on the type of working device. In conventional work vehicles, there is room for improvement in that the operator must operate the drive source to obtain an output intensity suitable for each type of working device.

[0005] The object of the present invention is to provide a work vehicle that makes it easy for the operator to operate the drive source to adjust the output strength to suit the work equipment attached to the work vehicle, thereby improving work efficiency. [Means for solving the problem]

[0006] The work vehicle of the present invention comprises a body, a drive source provided on the body, an attachment section which enables various working devices to be attached to the body and detached from the body, and a control section which controls the output strength of power from the drive source to the working devices attached to the attachment section, the control section having a plurality of output modes which differ in output strength, and a mode selection section which selects the output mode to be used from the plurality of output modes.

[0007] According to this invention, it is possible to configure the mode selection unit to select an output mode with an output intensity suited to the working device attached to the work vehicle, which makes it easier for the operator to operate the output intensity of the drive source, thereby improving work efficiency.

[0008] In the present invention, the mounting portion includes a plurality of mounting portions having different mounting positions, It is preferable that the mode selection section selects the output mode based on which of the plurality of attachment sections the working device is attached to.

[0009] According to this configuration, the mode selection unit can realize the function of selecting the output mode with a simple configuration in which the output mode is selected based on which mounting part the working device is attached to.

[0010] In the present invention, it is preferable that the mode selection unit acquires identification information for identifying the working device attached to the attachment portion, and selects the output mode based on the acquired identification information.

[0011] According to this configuration, it is possible to select an output mode for each working device, and it is possible to more appropriately select an output mode based on the strength of the power required by the working device.

[0012] In the present invention, it is preferable that an operation unit capable of manually selecting the output mode is provided, and the mode selection unit selects the output mode based on a selection operation of the operation unit.

[0013] According to this configuration, it is possible to select the output mode based on the operator's judgment.

[0014] In the present invention, it is preferable to provide a display unit capable of displaying the selected output mode.

[0015] According to this configuration, the operator can check the output mode selected by the mode selection section on the display section.

[0016] In the present invention, it is preferable that the drive source is a hydraulic pump, and the control unit controls the output intensity of power to the working device by controlling the amount of hydraulic oil discharged from the hydraulic pump.

[0017] According to this configuration, it is possible to control the output strength of the power to the working device, which has a hydraulic pump as its drive source.

[0018] In the present invention, the machine is provided with a running device that supports the body and a motor that drives the running device, the driving source is the motor, and it is preferable that the control unit controls the output strength of power to the working device by controlling the rotation speed of the motor.

[0019] According to this configuration, it is possible to control the output strength of the power to the working device, which has a motor as a drive source.

[0020] In the present invention, it is preferable that the drive source is an engine, and the control unit controls the output intensity of power to the working device by controlling the rotation speed of the engine.

[0021] According to this configuration, it is possible to control the output strength of the power to the working device, which has an engine as a drive source.

[0022] In the present invention, it is preferable that the control unit has the output mode for each combination of grass hardness and grass height, which can be selected when the working implement is a mower.

[0023] With this configuration, when the working implement is a mower, it is possible to select an output strength suitable for the hardness and height of the grass.

[0024] In the present invention, it is preferable that the control unit has the output mode selectable for each cutting height of the mower when the working implement is a mower.

[0025] With this configuration, when the working implement is a mower, it is possible to select an output intensity suitable for the cutting height of the mower.

[0026] In the present invention, it is preferable that the control unit has the output mode selectable for each size of the front loader when the working implement is a front loader.

[0027] According to this configuration, when the working implement is a front loader, it is possible to select an output strength suitable for the size of the front loader. [Brief description of the drawings]

[0028] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a left side view in vertical section showing the arrangement of a battery, a motor, etc. [Figure 4] FIG. 2 is a block diagram of a control configuration. [Diagram 5] 4 is a flowchart of a mode selection control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of the arrow F in the drawing is "forward", the direction of the arrow B is "backward", the direction of the arrow L is "left", and the direction of the arrow R is "right". Also, the direction of the arrow U in the drawing is "upward", and the direction of the arrow D is "downward".

[0030] [Overall configuration of the tractor] The work vehicle of this embodiment will be described below. Figures 1 and 2 show a tractor as an example of the work vehicle.

[0031] As shown in Figures 1 and 2, right and left front wheels 1 and right and left rear wheels 2 are attached to a machine body 3 as a running device to support the machine body 3. A bonnet 4 is provided at the front of the machine body 3, and a driver's section 5 is provided at the rear of the machine body 3. A steering wheel 6 for steering the front wheels 1, a driver's seat 7, and a ROPS frame 9 are provided at the driver's section 5.

[0032] As shown in Figures 1 and 3, the vehicle body 3 is configured to include right and left vehicle body frames 10, a continuously variable transmission 11, and a transmission case 12. The continuously variable transmission 11 is connected to the front part of the transmission case 12. The vehicle body frame 10 is connected to the continuously variable transmission 11 and the transmission case 12 and is provided along the front-to-rear direction. A front axle case 8 is attached to the front part of the vehicle body frame 10, and a front wheel 1 is attached to the front axle case 8. A rear wheel 2 is attached to the transmission case 12.

[0033] [Configuration of mounting part] The machine body 3 is provided with a plurality of mounting parts T to which various working devices W can be attached to and detached from the machine body 3. The mounting parts T include a plurality of mounting parts Ta, Tb, and Tc to which the working devices W are attached at different mounting positions. The working devices W attached to the mounting parts Ta, Tb, and Tc are located at the front, center, and rear of the machine body 3, respectively. Here, for ease of explanation, in Figs. 1 and 2, the working devices W are attached to all of the mounting parts T.

[0034] The machine body 3 is provided with sensors Ca, Cb, and Cc that detect when the working device W is attached to the attachment parts Ta, Tb, and Tc.

[0035] A top link 13 and right and left lower links 14 are provided at the rear of the fuselage 3. The top link 13 and the lower links 14 are attached to the rear of the transmission case 12 so as to be able to swing up and down. Right and left lift arms 15 are provided at the rear of the transmission case 12, and a rod 16 is connected between the lift arms 15 and the lower links 14.

[0036] Various types of working devices W, such as a rotary, whose position is at the rear of the machine body 3, can be attached to the top link 13 and the lower link 14. In other words, the top link 13 and the lower link 14 are configured as an attachment portion Tc. The working device W is raised and lowered via the top link 13 and the lower link 14 by the lift arm 15 being swung up and down.

[0037] 1 and 2, for example, a front loader 17 is attached to the attachment part Ta as a working device W. In this embodiment, the front loader 17 has a base 18, a boom 19, a bucket 20, a boom cylinder 21, a bucket cylinder 22, a frame 23, etc. The boom cylinder 21 operates to raise and lower the boom 19, and the bucket cylinder 22 operates to scoop and dump the bucket 20.

[0038] 1 and 2, a mower 24 is attached to the attachment part Tb where the working implement W is located at the center of the machine body 3 in the front-rear direction. In this embodiment, the mower 24 is attached to the machine body frame 10 so as to be able to rise and lower, and is disposed between the front wheels 1 and the rear wheels 2.

[0039] The mower 24 has three blades (not shown) that are rotated around an axis that runs vertically, and are arranged inside the mower 24 so that they are lined up in the left-right direction. Grass cut by the blades is discharged to the right side from the right discharge section 24a of the mower 24.

[0040] [Configuration of the transmission system] 3, a battery 27, an inverter 28, a motor 29, a battery 33, etc. are provided at the front of the aircraft body 3. Power from the battery 27 is supplied to the inverter 28, and the inverter 28 converts the DC power of the battery 27 into AC power and supplies it to the motor 29, causing the motor 29 to operate.

[0041] 3, the power of a motor 29, which is a drive source, is transmitted to the continuously variable transmission 11 via a transmission shaft 34. The continuously variable transmission 11 is configured as a hydrostatic type, and is capable of continuously changing the speed between the forward and reverse sides.

[0042] The power changed in speed by the continuously variable transmission 11 is transmitted to the rear wheels 2 via an auxiliary transmission (not shown) and a rear wheel differential (not shown) provided inside the transmission case 12. The power branched off immediately before the rear wheel differential is transmitted via transmission shafts 35, 36 to a front wheel differential (not shown) provided inside the front axle case 8, and then transmitted from the front wheel differential to the front wheels 1 (see FIG. 1). In other words, the front wheels 1 and the rear wheels 2 are driven by the power of the motor 29. In addition, the hydraulic pump 31 (see FIG. 4) is driven by the power of the hydraulic pump motor 30.

[0043] The PTO shaft 37 is provided at the bottom of the front part of the transmission case 12 facing forward, and the PTO shaft 38 is provided at the rear part of the transmission case 12 facing backward. Of the power transmitted by the transmission shaft 34, power that is not subjected to speed change by the continuously variable transmission 11 is transmitted to the PTO shafts 37, 38.

[0044] The power of the PTO shaft 37 is transmitted to the mower 24 via a transmission shaft (not shown). The power of the PTO shaft 38 is transmitted to the working device W attached to the top link 13 and the lower link 14 via a transmission shaft (not shown). In addition, hydraulic oil from a hydraulic pump 31 (see FIG. 4), which is a drive source, operates a hydraulic cylinder (not shown) that swings the boom cylinder 21 and bucket cylinder 22 of the front loader 17 and the lift arm 15.

[0045] [Control system configuration] As shown in Fig. 4, the tractor is provided with a control unit 40 that controls the output intensity of power from the motor 29 and hydraulic pump 31, which are drive sources, to the work implement W attached to the attachment part T. The control unit 40 has a plurality of output modes with different output intensities. Here, the output modes may be pre-stored in the control unit 40, or may be pre-stored in a storage device separate from the control unit 40. Furthermore, the control unit 40 may be configured to allow update processing such as addition and deletion of output modes.

[0046] The tractor is provided with a mode selection unit 41 that selects an output mode to be used from a plurality of output modes. In this embodiment, the mode selection unit 41 selects the output mode based on which of a plurality of mounting parts T the working implement W is attached to.

[0047] For example, when a front loader 17, which is a working device W, is attached to the attachment part Ta, the mode selection unit 41 selects an output mode based on the detection result of a sensor Ca provided on the attachment part Ta. In this embodiment, the control unit 40 controls the discharge amount of hydraulic oil from the hydraulic pump 31 based on the control content of the output mode selected by the mode selection unit 41, and controls the output strength of power to the front loader 17.

[0048] For example, when the mower 24, which is the working device W, is attached to the attachment part Tb, the mode selection part 41 selects an output mode based on the detection result of the sensor Cb provided on the attachment part Tb. In this embodiment, the control part 40 controls the rotation speed of the motor 29 based on the control content of the output mode selected by the mode selection part 41, and controls the output strength of the power to the mower 24.

[0049] For example, when a working device W such as a rotary is attached to the attachment part Tc, the mode selection part 41 selects an output mode based on the detection result of a sensor Cc provided on the attachment part Tc. In this embodiment, the control part 40 controls the rotation speed of the motor 29 based on the control content of the output mode selected by the mode selection part 41, and controls the output strength of the power to the working device W via the PTO shaft 38.

[0050] As shown in Fig. 1, the driving unit 5 is provided with a display unit 42 capable of displaying a selected output mode. The operator can confirm the selected output mode by checking the display on the display unit 42.

[0051] [Control Flow] The control unit 40 and the mode selection unit 41 are configured to perform control in accordance with the control flow shown in FIG.

[0052] The mode selection unit 41 selects an output mode based on the detection results of the sensors Ca, Cb, and Cc and on which of the multiple attachment parts T the working device W is attached to (step S01).

[0053] The mode selection unit 41 notifies the control unit 40 of the selected output mode (step S02).

[0054] The control unit 40 causes the display unit 42 to display the selected output mode (step S03).

[0055] The control unit 40 controls the output intensity of the power from the motor 29 and hydraulic pump 31, which are the drive sources, to the working device W, based on the selected output mode (step S04).

[0056] The above-described control flow is executed when the tractor is powered on, when the work implement W is replaced, etc.

[0057] [Another embodiment] Hereinafter, another embodiment in which the above embodiment is modified will be described.

[0058] (1) In the above embodiment, the mode selection unit 41 is configured to select the output mode based on which of the multiple mounting parts T the working device W is attached to. However, the present invention is not limited to the above embodiment, and may be configured to include an operation unit that can manually select and operate the output mode, and the mode selection unit 41 selects the output mode based on the selection operation of the operation unit. In addition, when the mower 24, which is the working device W, is attached to the mounting part Tb, these output modes may be stored in advance in the control unit 40 or the like so that an output mode can be selected for each combination of grass hardness (hard / soft) and grass height (high / low), and when the front loader 17, which is the working device W, is attached, these output modes may be stored in advance in the control unit 40 or the like so that an output mode can be selected for each size of the front loader 17.

[0059] The mode selection unit 41 may be configured to acquire identification information for identifying the working device W attached to the attachment portion T, for example, using an IC chip provided on the working device W and an antenna provided on the machine body 3, and to select an output mode based on the acquired identification information. In this case, the model number of the working device W may be used as the identification information. Also, the mowing height of the mower 24 and the output mode for each size of the mower 24 that can be selected when it is determined that the mower 24 is attached to the attachment portion Tb based on the identification information may be stored in advance in the control unit 40, etc. An output mode for each size of the front loader 17 that can be selected when it is determined that the front loader 17, which is the working device W, is attached, may be stored in advance in the control unit 40, etc. Also, the identification information may be configured to identify an attachment that can be attached to the front loader 17, and the mode selection unit 41 may be configured to select an output mode for each attachment attached to the front loader 17 based on the identification information.

[0060] (2) In the above embodiment, a configuration in which the working device W is attached to any one of the mounting parts Ta, Tb, or Tc has been described as an example. However, the present invention is not limited to the above embodiment, and the working device W may be configured to be attached to a plurality of mounting parts T.

[0061] (3) In the above embodiment, the control unit 40 is described as having the motor 29 and the hydraulic pump 31 as the drive source, but the present invention is not limited to the above embodiment, and may be configured, for example, as a drive source including an engine. In this case, the control unit 40 may be configured to control the engine speed and control the output strength of the power to the working device W based on the control content of the output mode selected by the mode selection unit 41.

[0062] (4) In the above embodiment, an example was described in which three mounting parts T, namely mounting parts Ta, Tb, and Tc, were provided. However, the present invention is not limited to the above embodiment, and the mounting part T may be provided with one or two mounting parts T, or may be provided with four or more mounting parts T.

[0063] (5) In the above embodiment, a configuration including a display unit 42 capable of displaying a selected output mode has been described as an example. However, the present invention is not limited to the above embodiment. A configuration not including a display unit 42 may be used. Further, instead of the display unit 42, a configuration including a sound generating device that notifies the user of the selected output mode by voice may be used.

[0064] (6) In the above embodiment, a configuration in which the running device is equipped with right and left front wheels 1 and right and left rear wheels 2 is described as an example. However, the present invention is not limited to the above embodiment, and the running device may be equipped with, for example, a crawler-type running device.

[0065] (7) In the above embodiment, a configuration in which a front loader 17, a mower 24, a rotary, etc. are attached as the working device W has been described as an example, but the present invention is not limited to the above embodiment, and the working device W may be, for example, a rear cutter, a snow blower, a box blade, a plow, a sprayer, a hole digger, etc.

[0066] The configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, unless a contradiction occurs. In addition, the embodiments disclosed in this specification are merely examples, and the present invention is not limited to these embodiments, and can be appropriately modified within the scope of the present invention. [Industrial Applicability]

[0067] The present invention can be used not only in tractors, but also in various work vehicles such as combine harvesters and rice transplanters. [Explanation of symbols]

[0068] 1: Front wheel (running gear) 2: Rear wheel (running gear) 3: Aircraft 17: Front loader 24: Moore 29: Motor (drive source) 31: Hydraulic pump (drive source) 40: Control section 41: Mode selection section 42: Display section T(Ta,Tb,Tc): Mounting part W: Work equipment

Claims

1. The aircraft and A drive source provided on the aircraft body; A mounting portion that allows various working devices to be attached to and detached from the machine body; a control unit that controls an output intensity of power from the drive source to the working device attached to the attachment unit, the control unit has a plurality of output modes with different output intensities, A work vehicle comprising a mode selection unit that selects the output mode to be used from a plurality of output modes.

2. The mounting portion includes a plurality of mounting portions having different mounting positions, The work vehicle according to claim 1 , wherein the mode selection unit selects the output mode based on which of the plurality of mounting parts the working device is attached to.

3. The work vehicle according to claim 1 , wherein the mode selection unit acquires identification information that identifies the work device attached to the attachment unit, and selects the output mode based on the acquired identification information.

4. An operation unit is provided that allows the output mode to be selected by manual operation, The work vehicle according to claim 1 , wherein the mode selection unit selects the output mode based on a selection operation of the operation unit.

5. The work vehicle according to claim 1 , further comprising a display unit capable of displaying the selected output mode.

6. the drive source is a hydraulic pump, The work vehicle according to claim 1 , wherein the control unit controls a discharge amount of hydraulic oil from the hydraulic pump to control a strength of power output to the work device.

7. A traveling device that supports the machine body; A motor that drives the traveling device is provided, the driving source is the motor, The work vehicle according to claim 1 , wherein the control unit controls a rotation speed of the motor to thereby control a strength of the power output to the work device.

8. the drive source is an engine, The work vehicle according to claim 1 , wherein the control unit controls a rotation speed of the engine to thereby control a power output intensity to the work device.

9. The work vehicle according to claim 1 , wherein the control unit has the output modes for each combination of grass hardness and grass height, which are selectable when the work implement is a mower.

10. The work vehicle according to claim 1 , wherein the control unit has the output mode selectable for each cutting height of the mower when the work implement is a mower.

11. 2. The work vehicle according to claim 1, wherein the control unit has the output mode selectable for each size of the front loader when the work implement is a front loader.

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