Work machine

Abstract

To provide a work machine capable of improving operability.SOLUTION: A work machine 100 includes a drive source 11, a travel unit 1, a work unit 2, a first operation unit 50, and a second operation unit 60. The drive source 11 generates a drive force. The travel unit 1 travels by the drive force. The work unit 2 performs work by the drive force. The first operation unit 50 receives operation of changing a travel state of the travel unit 1. The second operation unit 60 receives operation of switching a supply destination of the drive force between the travel unit 1 and the work unit 2.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] The work vehicle described in Patent Document 1 includes a transmission, an actuator, a cross-lever type operating tool, and a control device. The transmission changes the speed of the driving force transmitted from the drive source to the traveling part. The actuator operates the transmission member. The operating tool is movable forwards, backwards, left and right, and is biased to return to a neutral position. The control device differentiates the left and right functions of the operating tool depending on the gear stage of the transmission. When switching to field work, for example seedling replacement work in which seedlings are added to a seedling carrier, the worker operates the operating tool from the neutral speed position to the seedling replacement work position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-202632 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the work vehicle described in Patent Document 1, when the gear shift is changed by operating the operating tool, the operating tool returns to a neutral position after the gear shift. For example, when the seedling changing work is completed and the gear shift is returned to the neutral speed of the travel mode from the work mode, the worker may mistakenly operate the operating tool to the gear shift of the travel mode. Similarly, when switching from the travel mode to the work mode, the operating tool is located in the neutral position, so it is not easy for the worker to intuitively operate the operating tool.

[0005] The present invention provides a work machine that can improve operability. [Means for solving the problem]

[0006] A working machine according to one aspect of the present invention includes a drive source, a traveling unit, a working unit, a first operation unit, and a second operation unit. The drive source generates a driving force. The traveling unit travels by the driving force. The working unit performs work by the driving force. The first operation unit receives an operation to change the traveling state of the traveling unit. The second operation unit receives an operation to switch to a specific mode. The specific mode is a mode that performs at least one of stopping the transmission of the driving force to the working unit and reducing the driving force to put the machine into an idling state. Effect of the Invention

[0007] According to the present invention, a work machine with improved operability can be provided. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view of a working machine according to a first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] 4 is a perspective view showing the lever, the indicator, and the second operating portion. FIG. [Figure 7] 13 is a rear view of the lever, the indicator, and the second operating part. FIG. [Figure 8] FIG. 4 is a side view of the lever, the indicator portion, and the second operating portion. [Figure 9] FIG. 11 is a side view showing the front part of a work machine according to a second embodiment. [Figure 10] FIG. 11 is a perspective view showing a lever, a sign portion, and a second operating portion according to a second embodiment. [Figure 11] FIG. 11 is a schematic block diagram of a main part of a work machine according to a third embodiment. [Figure 12]11 is a graph showing an example of the relationship between the operation amount of an actuator of a work machine according to a third embodiment and the rotation speed of a drive source and the HMT speed ratio of a transmission part. [Figure 13] 11 is a flowchart showing an example of the operation of a work machine according to a third embodiment. [Figure 14] FIG. 11 is a perspective view showing a front part of a work machine according to a modified example. [Figure 15] 13 is a rear view of a lever, a sign portion, and a second operating portion according to another modified example. FIG. [Figure 16] FIG. 11 is a side view of a lever, a sign portion, and a second operating portion according to another modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a working machine 100 according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0010] In this embodiment, for ease of understanding, a front-rear direction X, a left-right direction Y, and an up-down direction Z may be described. The front-rear direction X includes a forward direction X1 and a backward direction X2. The forward direction X1 is the direction in which the working machine 100 moves forward. The backward direction X2 is the opposite direction to the forward direction X1. The left-right direction Y includes a left direction Y1 and a right direction Y2. The left direction Y1 is the left-hand direction toward the front end of the working machine 100. The right direction Y2 is the opposite direction to the left direction Y1. The up-down direction Z includes an upward direction Z1 and a downward direction Z2. The upward direction Z1 is the vertically upward direction. The downward direction Z2 is the opposite direction to the upward direction Z1.

[0011] <Embodiment 1> FIG. 1 is a side view of a work machine 100 according to the first embodiment.

[0012] As shown in Fig. 1, the working machine 100 includes a traveling section 1 and a working section 2. In this embodiment, a riding type rice transplanter on which an operator can ride is shown as an example of the working machine 100. However, the working machine 100 according to the present invention is not limited to this. The working machine 100 may be any working machine used in farm fields, such as a tractor, a seedling transplanter, or a harvester.

[0013] The traveling unit 1 has a frame 10, a driving source 11, a speed change unit 12, front wheels 13, rear wheels 14, and an inter-row speed change device 23. The traveling unit 1 travels by the driving force of the driving source 11.

[0014] The driving source 11 generates a driving force. The driving source 11 drives the front wheels 13 and the rear wheels 14. The driving source 11 is disposed in a central portion in the left-right direction Y in a portion on the front X1 side of the frame 10. The driving source 11 is, for example, an internal combustion engine that uses diesel as fuel. The driving source 11 transmits the driving force to the transmission 12.

[0015] A pair of front wheels 13 and a pair of rear wheels 14 are provided on the left and right sides. The pair of left and right front wheels 13 are attached to both ends of a front axle 13S in the left-right direction Y. The pair of left and right rear wheels 14 are attached to both ends of a rear axle 14S in the left-right direction Y. The front axle 13S is driven by a driving force transmitted from the transmission unit 12. The rear axle 14S is disposed behind the transmission unit 12, X2. The rear axle 14S receives driving force from the transmission unit 12 via a rear wheel drive shaft 15. Note that crawlers (not shown) may be provided instead of the rear wheels 14.

[0016] An operator sits in the driver's seat 16. The driver's seat 16 is disposed above the frame 10 at a position Z1. In front of the driver's seat 16 at a position X1, a dashboard 17, a bonnet 18, an operation panel 19, a steering wheel 20, an axis portion 21, and a spare seedling tray 22 are disposed.

[0017] The steering wheel 20 steers the traveling unit 1. The steering wheel 20 steers, for example, the front wheels 13. The steering wheel 20 is, for example, an annular part. The steering wheel 20 transmits the amount of operation by an operator to a steering mechanism (not shown) via the shaft portion 21. The amount of operation by the operator corresponds to the amount of rotation of the steering wheel 20. The steering mechanism steers the front wheels 13 to a steering angle according to the amount of operation.

[0018] The amount of operation of the steering wheel 20 is the amount of rotation of the steering wheel 20. The axle 21 transmits the amount of rotation of the steering wheel 20 to the front wheels 13. The axle 21 is, for example, a shaft extending upward Z1 from the surface of the operation panel 19. The steering wheel 20 is fixed to the end of the axle 21 on the upper Z1 side. The axle 21 is supported rotatably with respect to the frame 10.

[0019] Seedling mats are placed on the spare seedling trays 22. When seedling transplanting work is performed, the seedling mats are replenished in the working section 2. The spare seedling trays 22 are arranged in a plurality of stages in the up-down direction Z at both ends of the bonnet 18 in the left-right direction Y.

[0020] The inter-plant transmission 23 outputs the changed driving force to the working unit 2. The inter-plant transmission 23 is disposed on one side in the left-right direction Y, above Z1 the rear axle 14S. The inter-plant transmission 23 changes the speed of the driving force transmitted from the transmission unit 12 via a drive shaft (not shown). The inter-plant transmission 23 outputs the changed driving force to the working unit 2 via a drive shaft 35.

[0021] The working unit 2 performs work by using a driving force. The working unit 2 performs field work. The field work is, for example, planting seedlings. As shown in FIG. 1, the working unit 2 has a seedling carrier 30, a main frame 31, a transplanting mechanism 32, a center case 33, and a planting transmission case 34.

[0022] The seedling mat is placed on the seedling carrier 30. The main frame 31 is a rod-shaped member extending in the left-right direction Y. A center case 33 is disposed in the center of the main frame 31 in the left-right direction Y. The main frame 31 supports a planting transmission case 34. A plurality of planting transmission cases 34, for example, four sets, are disposed. The four sets of planting transmission cases 34 are disposed at equal intervals apart in the left-right direction Y with respect to the main frame 31. A pair of transplanting mechanisms 32, one on the left and one on the right, are provided in the planting transmission case 34.

[0023] A drive shaft 35 is connected to the input shaft 33A of the center case 33 via a universal joint. The center case 33 has a gear train (not shown) including a bevel gear. An output shaft (not shown) of the center case 33 is provided along the main frame 31 and connected to the planting transmission case 34. The driving force is transmitted to the transplanting mechanism 32 via the drive shaft 35, the center case 33, and the planting transmission case 34.

[0024] The working unit 2 has a lateral feed drive unit (not shown) that drives the seedling carrier 30 to move in the left-right direction Y. The transplanting mechanism 32, in conjunction with the reciprocating movement of the seedling carrier 30 in the left-right direction Y, removes the seedlings from the seedling carrier 30 and plants them in the field. The working unit 2 has a lifting device 36. The lifting device 36 has a hydraulic cylinder 37, a columnar frame 38, and a link unit 39.

[0025] The rear X2 end of the frame 10 is supported by a columnar frame 38. The joints between the columnar frame 38, the base 30a, and the pair of upper and lower link parts 39 form four vertices of a parallelogram. The seedling carrier 30 is connected to the link part 39 via the base 30a. The hydraulic cylinder 37 has a front X1 end connected to the running part 1 side and a rear X2 end connected to the lower link part 39. The pair of link parts 39 swing in the vertical direction Z with the joints on the columnar frame 38 side as the fulcrum due to the extension and contraction of the rod of the hydraulic cylinder 37. When performing seedling transfer work, the pair of link parts 39 swing upward Z1 to raise the working part 2 including the seedling carrier 30. The worker refills the raised seedling carrier 30 with seedling mats.

[0026] Next, the working machine 100 according to this embodiment will be further described with reference to Fig. 2. Fig. 2 is a perspective view showing the front part of the working machine 100.

[0027] 1, the dashboard 17 is supported by the frame 10 and is located in front of the legs of a seated operator in a direction X1. The dashboard 17 is a surface portion that intersects with the front-rear direction X.

[0028] As shown in Fig. 2, the dashboard 17 is provided with an opening 171 penetrating in the front-rear direction X. A third lever 71 of the third operating unit 70 is disposed inside the dashboard 17. The third lever 71 is inserted through the opening 171 and protrudes rearward X2. The third lever 71 is supported so as to be swingable in the up-down direction Z.

[0029] Various operating devices are arranged on the operation panel 19. The operation panel 19 is connected to an upper Z1 end of the dashboard 17 and an upper Z1 end of the bonnet 18. The operation panel 19 is a surface portion that intersects with the up-down direction Z. On the operation panel 19, a meter panel 191, a shaft portion 21, a support portion 40, and a plurality of buttons are arranged.

[0030] The work machine 100 further includes a first operating unit 50 and a second operating unit 60. The support unit 40 supports the first operating unit 50 and the second operating unit 60. The support unit 40 is disposed along the shaft unit 21 on the left side Y1 of the shaft unit 21. The location of the support unit 40 is not limited to the left side Y1 of the shaft unit 21. The support unit 40 may be disposed on the right side Y2 of the shaft unit 21. The support unit 40 may also be disposed in the front X1 or rear X2 of the shaft unit 21.

[0031] The first operating unit 50 accepts an operation to change the traveling state of the traveling unit 1. The first operating unit 50 has, for example, a first lever 51. The first lever 51 is operated by an operator. The first lever 51 is operated by an operator seated in the driver's seat 16 or an operator who has dismounted. The first lever 51 changes the gear shift state of the transmission unit 12 depending on the position to which it is operated. The first lever 51 corresponds to, for example, a "lever."

[0032] The second operation unit 60 accepts an operation to switch the supply destination of the driving force between the traveling unit 1 and the working unit 2 (hereinafter, referred to as a switching operation). Since the first operation unit 50 and the second operation unit 60 are provided independently, the operation targets operated by the worker are different. Since the operation targets are different, it is possible to avoid an erroneous operation of the first operation unit 50 by mistake when operating the second operation unit 60. Furthermore, by operating the second operation unit 60, a switching operation to switch the supply destination of the driving force between the traveling unit and the working unit can be easily performed. As a result, the operability of the work machine 100 can be improved. The second operation unit 60 has, for example, a push button switch 61 (hereinafter, referred to as a switch 61).

[0033] The first operating unit 50 has a first lever 51 that rotates around the support unit 40. Therefore, the first lever 51 can be easily rotated around the support unit 40. As a result, the first operating unit 50 can be operated simply by rotating the first operating unit 50.

[0034] At least one of the first operating unit 50 and the second operating unit 60 is disposed below the steering wheel 20. At least one of the operating units is disposed within reach of the operator when the operator is holding the steering wheel 20. Therefore, the first operating unit 50 or the second operating unit 60 can be operated consecutively to the operation of the steering wheel 20. As a result, the operability of the first operating unit 50 or the second operating unit 60 can be improved. In this embodiment, both the first operating unit 50 and the second operating unit 60 are disposed below the steering wheel 20. Therefore, the operability can be further improved.

[0035] Next, the transmission 12 according to this embodiment will be described with reference to Fig. 3. Fig. 3 is a plan view showing the transmission 12.

[0036] The transmission unit 12 switches the transmission state of the traveling unit 1. The transmission unit 12 divides the driving force of the driving source 11 into a first mode and a second mode. The first mode includes a neutral state, and indicates a state in which the driving force is transmitted to the front wheels 13 and the rear wheels 14. The first operating unit 50 accepts an operation of the first mode.

[0037] In the first mode, the transmission 12 switches the gear state of the traveling unit 1 among a forward gear F, a neutral gear N, and a reverse gear R by operating the first operating unit 50. The forward gear F is a gear where the traveling unit 1 moves forward in the forward direction X1. The reverse gear R is a gear where the traveling unit 1 moves backward in the backward direction X2. The neutral gear N is a gear where the driving force directed toward the front wheels 13 is cut off and a neutral state is maintained.

[0038] The first operating unit 50 accepts manual operation by the operator. When the first operating unit 50 accepts operation by the operator, the first operating unit 50 changes the position of the first lever 51, which is the target of operation. The forward speed F has a planting speed F1 and a moving speed F2. The planting speed F1 is the forward speed when planting seedlings in a field. The planting speed F1 is switched by swinging or rotating the first lever 51 from the position of the neutral speed N to the horizontal forward direction X1.

[0039] The travel speed F2 is the forward speed when travelling outside a field or when only traveling within a field. The travel speed F2 is a higher gear than the planting speed F1. As shown in FIG. 2, the travel speed F2 is switched by the third lever 71. When switching from the planting speed F1 to the travel speed F2, the third lever 71 is pushed downward Z2 while the planting speed F1 is being performed. When switching from the travel speed F2 to the planting speed F1, the third lever 71 is pushed upward Z1.

[0040] The reverse speed R is switched by swinging or rotating the first lever 51 backward in the horizontal direction X2 from the position of the neutral speed N. The neutral speed N is switched by disposing the first lever 51 in a position along the left-right direction Y.

[0041] The support unit 40 supports the first lever 51 so as to be movable between a first position, a second position, and a third position. For example, the first position corresponds to the planting speed F1, the second position corresponds to the neutral speed N, and the third position corresponds to the reverse speed R. In other words, the traveling unit 1 switches the traveling state in response to the movement of the first lever 51. The support unit 40 moves the first lever 51 from the first position to the third position. The traveling state can be switched by moving the position of the first lever 51. As a result, the traveling state can be easily switched.

[0042] Here, the first lever 51 is supported at the position operated by the operator, and does not automatically return to the neutral speed N position (second position) or the like without the operator's operation. In other words, when the operator operates the first lever 51 to the planting speed F1 position (first position), even if the operator releases the first lever, the first lever 51 does not automatically return to the neutral speed N position (second position) or the like, and the first lever 51 is supported at the planting speed F1 position (first position). This makes it easy for the operator to intuitively operate the first lever 51.

[0043] The support unit 40 has a detection unit 41 that detects the position of the first lever 51. The detection unit 41 is, for example, a proximity sensor. The detection unit 41 detects the position of the moved first lever 51. The detection unit 41 outputs the detected position information of the first lever 51 to the gear shifting unit 12.

[0044] The second mode indicates a state in which driving force is transmitted to a portion other than the wheels 13 to perform field work or work related to the field work. In the second mode, driving by the wheels 13 is restricted. The second operating unit 60 accepts operations related to the working unit 2 on the condition that the first operating unit 50 has accepted an operation to change gears to neutral speed N. When performing field work or work related to the field work, erroneous operation of the first operating unit 50 can be avoided because the first operating unit 50 and the second operating unit 60 are physically separated.

[0045] The second operation unit 60 accepts a switching operation. The switching operation corresponds to a switching operation from the first mode to the second mode, or a switching operation from the second mode to the first mode. The switch 61 is, for example, an alternate switch. When the second mode is executed by turning on the switch 61, the switch 61 is lit. When the execution of the second mode is terminated by turning off the switch 61, the switch 61 is turned off. The lighting of the switch 61 makes it easy to visually confirm that the second mode is in effect.

[0046] As shown in FIG. 3, the transmission unit 12 has an input shaft 121, an actuator 130, an input side fork shaft 131, an output shaft 141, and an output side fork shaft 151.

[0047] The input shaft 121 has a planting speed gear 122, a moving speed gear 123, a reverse speed gear 124, and a ball clutch 125. As shown in Fig. 1, the driving force of the driving source 11 is transmitted to the input shaft 121 via a hydrostatic continuously variable transmission, a planetary gear mechanism, and a clutch (all of which are not shown).

[0048] As shown in FIG. 3, the ball clutch 125 has a shifter 125S. When the first lever 51 is located at the neutral speed N position, the shifter 125S is located, for example, at the center position of the input shaft 121 in the left-right direction Y in which the input shaft 121 extends. The center position of the input shaft 121 is, for example, a position where the distance between the moving speed gear 123 and the ball clutch 125 and the distance between the ball clutch 125 and the reverse speed gear 124 are approximately equal. When the shifter 125S is located at the center position of the input shaft 121, neither the planting speed gear 122 nor the reverse speed gear 124 is connected to the input shaft 121. Note that, at the time of the neutral speed N, the shifter 125S may be located at a position other than the center position of the input shaft 121.

[0049] When the shifter 125S slides to the left Y1 from the center position, the planting speed gear 122 is connected to the input shaft 121. This allows the planting speed F1 to be performed. When the shifter 125S slides to the right Y2 from the center position, the reverse speed gear 124 is connected to the input shaft 121. This allows the reverse speed R to be performed.

[0050] The input fork shaft 131 has a fork 132, a pivot 133, and a rod 134. The actuator 130 is operated based on position information of the first lever 51.

[0051] When the first lever 51 is operated to the position of the planting speed F1, the actuator 130 retracts the rod 134 to the rear X2. When the actuator 130 shortens the rod 134 to the rear X2, the pivot 133 swings around the fulcrum, and the input side fork shaft 131 and the shifter 125S slide to the left Y1. When the first lever 51 is operated to the position of the reverse speed R, the actuator 130 pushes the rod 134 forward X1. When the actuator 130 extends the rod 134 to the front X1, the pivot 133 swings around the fulcrum, and the input side fork shaft 131 and the shifter 125S slide to the right Y2.

[0052] The output shaft 141 has a slide gear 142 and a brake 143. The slide gear 142 includes a planting speed gear 142a and a moving speed gear 142b. The slide gear 142 is connected to the output shaft 141 by a spline and is slidable in the left-right direction Y.

[0053] The output-side fork shaft 151 has a fork 152, a pivot 153, and a rod 154. The fork 152 is coupled to the slide gear 142. A rear X2 end of the rod 154 is swingably coupled to a left Y1 end of the pivot 153. A front X1 end of the rod 154 is connected to a base end of the third lever 71 via a rod, a wire, or the like.

[0054] As shown in FIG. 2, when the first lever 51 is operated from the neutral speed N position to the planting speed F1 position, the detection unit 41 detects that the first lever 51 has been operated to the planting speed F1 position. When the first lever 51 is operated to the planting speed F1 position, the actuator 130 retracts the rod 134. As shown in FIG. 3, the input side fork shaft 131 and the shifter 125S slide to the left Y1, so that the planting speed gear 122 is connected to the input shaft 121, and the driving force is transmitted to the planting speed gear 142a of the output shaft 141. As a result, the working machine 100 moves forward at the planting speed F1.

[0055] As shown in FIG. 2, when the first lever 51 is operated from the neutral speed N position to the reverse speed R position, the detection unit 41 detects that the first lever 51 has been operated to the reverse speed R position. When the first lever 51 is operated to the reverse speed R position, the actuator 130 pushes out the rod 134. As shown in FIG. 3, the input side fork shaft 131 and the shifter 125S slide to the right Y2, so that the reverse speed gear 124 is connected to the input shaft 121, and the driving force is transmitted to the output shaft 141 via the reverse gear. As a result, the working machine 100 moves backward at reverse speed R.

[0056] When the first lever 51 is positioned at the planting speed F1, if the third lever 71 is operated from the upper Z1 to the lower Z2, the rod 154 slides forward X1. As a result, the pivot 153 swings around the fulcrum, and the output side fork shaft 151 and the slide gear 142 slide to the right Y2. Then, the planting speed gear 142a disengages from the planting speed gear 122, and the moving speed gear 142b connects to the moving speed gear 123. The driving force is transmitted to the moving speed gear 142b of the output shaft 141, and the working machine 100 moves forward at the moving speed F2.

[0057] As shown in FIG. 2, when the switch 61 is turned on while the first lever 51 is in the neutral speed N position, the transmission 12 maintains the neutral speed N state. The working unit 2 performs an operation related to the second mode, for example, seedling succession work. Specifically, as shown in FIG. 1, the hydraulic cylinder 37 is operated to swing the pair of link parts 39 upward Z1, thereby lifting the working unit 2 including the seedling carrier 30. The operator refills the raised seedling carrier 30 with seedling mats.

[0058] Next, the first operating unit 50 and the second operating unit 60 according to this embodiment will be described in detail with reference to Fig. 4 to Fig. 8. Fig. 4 is a plan view showing the front part of the working machine 100. Fig. 5 is a side view showing the front part of the working machine 100. Fig. 6 is a perspective view showing the first lever 51, the sign part 80, and the second operating unit 60. Fig. 7 is a view of the first lever 51, the sign part 80, and the second operating unit 60 as viewed from the rear. Fig. 8 is a view of the first lever 51, the sign part 80, and the second operating unit 60 as viewed from the side.

[0059] 4, the support part 40 is included in the area surrounded by the annular steering wheel 20 in a plan view. The support part 40 is located below the steering wheel 20 at a position Z2. The support part 40 supports an end part on the right Y2 side of the first lever 51 at an end part on the upper Z1 side. The support part 40 houses a detection part 41 that detects the position of the first lever 51 at an end part on the upper Z1 side.

[0060] 4 to 6, the work machine 100 further includes a sign unit 80. As shown in Figures 4 and 6, the sign unit 80 guides the operation direction of the first lever 51. The sign unit 80 has a main body portion 81 and an extension portion 82.

[0061] 7, the left Y1 end of the sign portion 80 is located further to the left Y1 than the left Y1 end of the first lever 51. In other words, in the radial direction of the rotation axis C of the first lever 51, the outer end 81a of the sign portion 80 is located further outward than the outer end 51a of the first lever 51. Therefore, when the worker gets on the work machine 100, the sign portion 80 protects the first lever 51. As a result, interference between the worker's legs and the first lever 51 can be more reliably avoided.

[0062] The sign portion 80 is disposed below the first lever 51 at a position Z2. Therefore, since the sign portion 80 does not cover the upper side Z1 of the first lever 51, the visibility of the first lever 51 by the worker can be ensured. In addition, since the sign portion 80 is located below the first lever 51 at a position Z2, it is possible to avoid contact between the first lever 51 and the leg of the worker, for example, when the worker gets on the work machine 100 or passes by the side of the hood 18. Therefore, while ensuring the visibility of the first lever 51, it is possible to suppress interference between the worker and the first lever 51, for example.

[0063] The main body 81 extends in the front-rear direction X. As shown in Fig. 4 and Fig. 8, the main body 81 has an area corresponding to the first position A1 of the first lever 51, an area corresponding to the second position A2 of the first lever 51, and an area corresponding to the third position A3 of the first lever 51. The area corresponding to the first position A1 is located further forward in the X1 direction than the area corresponding to the second position A2. The area corresponding to the second position A2 is located further forward in the X1 direction than the area corresponding to the third position A3.

[0064] As shown in FIG. 4 and FIG. 6, the main body 81 has a first mark M1, a second mark M2, and a third mark M3. The first mark M1 is a mark indicating the planting speed F1. The first mark M1 corresponds to the first position A1. The second mark M2 is a mark indicating the neutral speed N. The second mark M2 corresponds to the second position A2. The third mark M3 is a mark indicating the reverse speed R. The third mark M3 corresponds to the third position A3. Therefore, since the sign part 80 guides the operation direction of the first lever 51, it becomes easier for the operator to operate the first lever 51. Moreover, as shown in FIG. 8, the center part of the first lever 51 is shaped to protrude upward Z1, so that it is easy to hook the fingertips and to operate it further.

[0065] The extension 82 has an end on the right side (Y2) supported by the support part 40. The end on the left side (Y1) of the extension 82 is connected to the center position of the main body part 81 in the front-rear direction (X). As shown in Figs. 6 and 7, the extension 82 supports the second operating part 60. That is, the sign part 80 supports the second operating part 60. Therefore, the second operating part 60 and the sign part 80 can be integrated into one part. In other words, the second operating part 60 and the sign part 80 can be integrated into one part, which can reduce the size. Furthermore, by integrating them into one part, the number of parts can be reduced.

[0066] The sign unit 80 is disposed between the first lever 51 and the second operating unit 60. The sign unit 80 can be interposed between the first operating unit 50 and the second operating unit 60. When operating the second operating unit 60, interference between the operator's hand and the first operating unit 50 can be suppressed. As a result, erroneous operation of the first operating unit 50 can be further suppressed. Similarly, erroneous operation of the second operating unit 60 can be further suppressed.

[0067] The second operating unit 60 has a switch 61 and an attachment portion 62. As shown in Figs. 7 and 8, the second operating unit 60 is located below the sign portion 80 in the Z2 direction. The attachment portion 62 is attached to the lower surface of the extension portion 82. The switch 61 is supported by the end portion on the left Y1 side of the attachment portion 62. Therefore, the second operating unit 60 is located below the first lever 51 in the Z2 direction, at a position that partially overlaps with the first lever 51 in a plan view. Since it is easy to shorten the distance between the first lever 51 and the second operating unit 60, operability can be improved.

[0068] 4 and 6, the second operating unit 60 is disposed at a position overlapping with the first lever 51 located at the second position A2 in a plan view. Since the distance from the first lever 51 located at the second position A2 to the second operating unit 60 can be shortened, the operability of the second operating unit 60 can be improved.

[0069] <Embodiment 2> Next, a second embodiment of the work machine 100A will be described with reference to Figs. 9 and 10. Fig. 9 is a side view showing the front of the work machine 100A according to the second embodiment. Fig. 10 is a perspective view showing the first lever 51, the marker unit 80, and the second operating unit 60A according to the second embodiment. The second embodiment differs from the first embodiment mainly in the position and shape of the second operating unit 60A. Below, the differences between the second embodiment and the first embodiment will be described, and the rest of the description of the first embodiment will be applied to the second embodiment.

[0070] The second operation unit 60A receives an operation to switch the supply destination of the driving force between the traveling unit 1 and the working unit 2. The switching operation corresponds to switching from the first mode to the second mode, or switching from the second mode to the first mode. As shown in FIGS. 9 and 10, the second operation unit 60A is disposed on the operation panel 19. The second operation unit 60A has a switch 61A.

[0071] 9 and 10, switch 61A is disposed on operation panel 19. When switch 61A is turned on to execute the second mode, switch 61A is lit. When switch 61A is turned off to end execution of the second mode, switch 61A is turned off. The lighting of switch 61A notifies execution of the second mode.

[0072] The switch 61A is located on the left side Y1 of the shaft 21, below the marker 80 (Z2). By separating the first lever 51 and the switch 61A, contact between the operator's hand and the switch 61A is avoided.

[0073] The switch 61A is disposed at a position overlapping with the first lever 51 at the second position A2 in a plan view. The second position A2 of the first lever 51 corresponds to the neutral speed N. The positional relationship between the first lever 51 at the second position A2 and the switch 61A can be set in the vertical direction Z, so that the movement path can be simplified. As a result, the operability of the second operating unit 60A can be improved.

[0074] <Embodiment 3> Next, a working machine 100 according to a third embodiment will be described with reference to Figures 11 to 13. The working machine 100 according to the third embodiment differs from the working machine 100 according to the first embodiment mainly in the operation when the second operating unit 60 is operated. Below, the differences from the first embodiment will be described, and other explanations of the first embodiment will be applied to the third embodiment as appropriate.

[0075] In this embodiment, the second operation unit 60 accepts an operation to switch to the specific mode. The specific mode is a mode in which at least one of the following is performed: the transmission of the driving force of the drive source 11 to the working unit 2 is stopped, or the driving force of the drive source 11 is reduced to an idling state. In this embodiment, the working machine 100 is a rice transplanter, and a mode (seedling succession mode) suitable for seedling succession work in which an operator refills seedling mats on the seedling carrier 30 of the working unit 2 is an example of the specific mode. That is, the second operation unit 60 is operated to switch the operation mode of the working machine 100 to the specific mode (seedling succession mode) suitable for seedling succession work.

[0076] In this embodiment, as an example, the specific mode (seedling succession mode) executes both of stopping the transmission of the driving force of the drive source 11 to the working unit 2 and reducing the driving force of the drive source 11 to an idling state. That is, in the specific mode (seedling succession mode), the working machine 100 in this embodiment stops the transmission of the driving force of the drive source 11 to the working unit 2, and reduces the driving force of the drive source 11 to an idling state. As a result, in the specific mode, for example, the operation of the working unit 2 is disabled, and unintentional operation of the working unit 2 can be prevented, and further, the idling state of the drive source 11 can reduce fuel consumption and noise in the drive source 11.

[0077] More specifically, the working machine 100 according to this embodiment includes, as operating parts operated by an operator, a fourth operating part 90 in addition to a first operating part 50 and a second operating part 60, as shown in Fig. 11. The fourth operating part 90 has, for example, a speed change pedal for operating the working part 2, which is provided at the feet (floor) of an operator seated in the driver's seat 16. The speed change pedal operates the working part 2 by the driving force from the driving source 11 according to the amount of depression of the speed change pedal.

[0078] The work machine 100 includes a control unit 91 and an actuator 92. To the control unit 91, at least the first operation unit 50, the second operation unit 60, and the fourth operation unit 90 are electrically connected.

[0079] The control unit 91 mainly comprises a computer system having one or more processors such as a CPU (Central Processing Unit) and one or more memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and executes various processes (information processing). In this embodiment, since the control unit 91 mainly comprises a computer system having one or more processors, the control unit 91 is realized by the one or more processors executing a control program. In this embodiment, the control unit 91 is an integrated controller that controls the entire working machine 100, and is composed of, for example, an electronic control unit (ECU). However, the control unit 91 may be provided separately from the integrated controller.

[0080] The control unit 91 is configured to be able to communicate with devices provided in each part of the work machine 100. In addition to the first operation unit 50, the second operation unit 60, and the fourth operation unit 90, at least an actuator 92 is electrically connected to the control unit 91. This allows the control unit 91 to control the actuator 92 and obtain the operating state of the actuator 92 using a sensor (or an encoder) provided in the actuator 92. Here, the control unit 91 may exchange various information (data) with each device directly, or indirectly via a relay or the like.

[0081] The actuator 92 is controlled by an electric signal (current output) from the control unit 91, and controls the driving source 11 and the transmission unit 12. The actuator 92 is, for example, an electric motor, and controls the driving source 11 by wire operation and the transmission unit 12 by rod operation.

[0082] In this embodiment, as an example, the driving source 11 is an internal combustion engine (engine). The actuator 92 is configured to be able to control at least the rotation speed of the driving source 11 (engine). This allows the control unit 91 to control the driving source 11 via the actuator 92, and to control at least the rotation speed of the driving source 11 to a target rotation speed.

[0083] In the present embodiment, as an example, the transmission 12 is a hydraulic mechanical transmission (HMT). This transmission 12 changes the operating speed of the working unit 2 while transmitting the driving force of the driving source 11 to at least the working unit 2. In particular, a continuously variable transmission is used as the transmission 12 here, and even if the rotation speed of the driving source 11 (engine) is constant, the transmission 12 can continuously change the operating speed of the working unit 2. This allows the control unit 91 to control the transmission 12 via the actuator 92, and to control at least the operating speed of the working unit 2.

[0084] 12 shows an example of a control pattern of the driving source 11 and the transmission unit 12 by the actuator 92. In Fig. 12, the horizontal axis represents the operation amount of the actuator 92, and the rotation speed G1 of the driving source 11 (engine) and the HMT speed ratio G2 of the transmission unit 12 are shown.

[0085] As is clear from Fig. 12, when the actuator 92 is in the range from the seedling succession idling position P1 to the normal idling position P2, the HMT speed ratio G2 is fixed to "0". Similarly, the rotation speed G1 of the driving source 11 (engine) changes in proportion to the operation amount of the actuator 92 so that the driving source 11 (engine) is in an idling state (minimum rotation speed R1) at the seedling succession idling position P1 and in a normal idling state (idling rotation speed R2) at the normal idling position P2. On the other hand, when the actuator 92 is in the range from the normal idling position P2 to the maximum speed position P3, both the rotation speed G1 of the driving source 11 (engine) and the HMT speed ratio G2 change in proportion to the operation amount of the actuator 92.

[0086] Here, in the present embodiment, the control unit 91 is configured to be able to switch among three modes as operation modes: a specific mode (seedling transfer mode), a normal mode, and a standby mode. In the normal mode, the control unit 91 operates the actuator 92 between the normal idling position P2 and the maximum speed position P3 according to the depression amount of the shift pedal of the fourth operation unit 90. That is, in the normal mode, as the depression amount of the shift pedal of the fourth operation unit 90 increases, the rotational speed G1 of the drive source 11 (engine) and the HMT speed ratio G2 increase while being interlocked with each other, and the operating speed of the working unit 2 gradually becomes higher.

[0087] Also, in the standby mode, the control unit 91 fixes the actuator 92 at the normal idling position P2. That is, in the standby mode, regardless of the depression amount of the shift pedal of the fourth operation unit 90, the HMT speed ratio G2 is fixed at "0", and the rotational speed G1 of the drive source 11 (engine) is fixed at the idling rotational speed R2 (>R1).

[0088] In addition, in the specific mode (seedling transfer mode), the control unit 91 fixes the actuator 92 at the seedling transfer idling position P1. That is, in the specific mode, regardless of the depression amount of the shift pedal of the fourth operation unit 90, the HMT speed ratio G2 is fixed at "0", and the rotational speed G1 of the drive source 11 (engine) is fixed at the minimum rotational speed R1 (<R2). In the present embodiment, if the HMT speed ratio G2 is "0", the transmission of the driving force of the drive source 11 is stopped not only to the working unit 2 but also to the traveling unit 1. Therefore, in the specific mode (seedling transfer mode), the transmission of the driving force of the drive source 11 to the working unit 2 and the traveling unit 1 is stopped, and the driving force of the drive source 11 decreases to an idling state. As a result, in the specific mode, the operation of not only the working unit 2 but also the traveling unit 1 can be invalidated to prevent the working unit 2 and the traveling unit 1 from operating unintentionally.

[0089] Below, the conditions under which the control unit 91 switches the operation mode among the specific mode (seedling succession mode), the normal mode, and the standby mode will be described with reference to Fig. 13. Basically, the control unit 91 switches between the specific mode, the normal mode, and the standby mode depending on the operation states of the first operation unit 50 and the second operation unit 60.

[0090] Specifically, the control unit 91 switches between a seedling succession disallowed state and a seedling succession allowed state in response to the operation of the switch 61 of the second operation unit 60. In this embodiment, the switch 61 is a momentary switch, and the control unit 91 switches between a seedling succession disallowed state and a seedling succession allowed state every time the switch 61 is pressed.

[0091] Here, in the default (i.e., when the working machine 100 is started), the operation mode of the control unit 91 is the normal mode (S1) and is in a seedling succession disallowed state (S2). At this time, the control unit 91 operates the actuator 92 between the normal idling position P2 and the highest speed position P3 according to the amount of depression of the speed change pedal of the fourth operation unit 90 to operate the working unit 2. In this state, when the switch 61 of the second operation unit 60 is pressed (turned on) (S3: Yes), the control unit 91 switches from the seedling succession disallowed state to the seedling succession allowed state (S4). On the other hand, if the switch 61 of the second operation unit 60 is not pressed (S3: No), the control unit 91 maintains the seedling succession disallowed state (S2).

[0092] In the seedling succession permitted state, when the first lever 51 of the first operation unit 50 is in the neutral speed N position (second position) (S5: Yes), the control unit 91 switches the operation mode from the normal mode to the standby mode (S6). The standby mode is an operation mode in which the operation mode is on standby to transition to a specific mode (seedling succession mode). At this time, the control unit 91 fixes the HMT speed ratio to "0" regardless of the amount of depression of the speed change pedal of the fourth operation unit 90, thereby stopping the transmission of the driving force of the driving source 11 to the working unit 2 and reducing the rotation speed of the driving source 11 (engine) to the idling rotation speed R2. On the other hand, when the first lever 51 is in a position other than the neutral speed N (S5: No), the control unit 91 continues the normal mode.

[0093] Then, when a certain time (for example, 2 seconds) has elapsed (S7: Yes), the control unit 91 switches the operation mode from the standby mode to a specific mode (seedling succession mode) (S8). At this time, the control unit 91 further reduces the rotation speed of the drive source 11 (engine) from the idling rotation speed R2 to the minimum rotation speed R1 while fixing the HMT speed ratio at "0", regardless of the amount of depression of the speed change pedal of the fourth operation unit 90. Until the certain time has elapsed (S7: No), the control unit 91 continues the standby mode (S6).

[0094] However, the flowchart shown in FIG. 13 is merely an example, and processes may be added or omitted as appropriate, and the order of processes may be changed as appropriate.

[0095] For example, although not included in FIG. 13, when the switch 61 of the second operation unit 60 is pressed after the first lever 51 of the first operation unit 50 is operated to the neutral speed N position (second position), the operation mode of the control unit 91 is switched to the specific mode (seedling succession mode). Specifically, when the first lever 51 of the first operation unit 50 is operated to the neutral speed N position (S5: Yes) while the seedling succession is not permitted, and the switch 61 of the second operation unit 60 is pressed in this state, the operation mode of the control unit 91 is switched from the normal mode to the specific mode, skipping the standby mode. In other words, when the switch 61 of the second operation unit 60 is pressed while the first lever 51 of the first operation unit 50 is in the neutral speed N position, the operation mode of the control unit 91 is immediately switched to the specific mode without waiting for a certain time to elapse.

[0096] Furthermore, when the operation mode of the control unit 91 is in the specific mode, if the first lever 51 of the first operating unit 50 is switched to a position other than the neutral speed N, that is, to the planting speed F1 position (first position) or the reverse speed R position (third position), the release condition is met and the specific mode is released. In other words, when the first lever 51 of the first operating unit 50 is operated to a position other than the neutral speed N in the specific mode, the release condition is met and the control unit 91 switches the operation mode from the specific mode to the normal mode. When the operation mode is switched to the normal mode, the control unit 91 resumes the transmission of the driving force of the driving source 11 to the working unit 2 and increases the rotation speed of the driving source 11 (engine).

[0097] Furthermore, the release condition is also satisfied when the switch 61 of the second operation unit 60 is pressed while the operation mode of the control unit 91 is in the specific mode. In other words, when the switch 61 of the second operation unit 60 is pressed while the first lever 51 of the first operation unit 50 is fixed at the neutral speed N position in the specific mode, the release condition is satisfied and the control unit 91 switches the operation mode from the specific mode to the normal mode.

[0098] As described above, when the first operating unit 50 is in a specific operating state while the second operating unit 60 is operated, the mode is switched to the specific mode. In this embodiment, an example of the specific operating state is when the first lever 51 of the first operating unit 50 is in the neutral speed N position. As a result, for example, by operating the switch 61 of the second operating unit 60 in advance to set the seedling succession permitted state, the operation mode can be switched to the specific mode simply by operating the first lever 51 of the first operating unit 50 to the neutral speed N position. Therefore, it is possible to switch to the specific mode with a relatively simple operation.

[0099] Moreover, if the switch 61 of the second operation unit 60 is operated to set the seedling succession disallowed state, the operation mode will not be switched to the specific mode simply by operating the first lever 51 of the first operation unit 50 to the neutral speed N position. Therefore, it is possible to prevent the operation mode from being switched to the specific mode unintentionally by the operator.

[0100] Furthermore, in this embodiment, the specific mode is switched to after a certain time has elapsed since the first operating unit 50 entered a specific operating state. That is, for example, when the switch 61 of the second operating unit 60 is operated to enter a seedling succession permitted state and the first lever 51 of the first operating unit 50 is in the neutral speed N position, the specific mode is not switched to immediately, but is switched to after a certain time has elapsed. Therefore, for example, when the first lever 51 of the first operating unit 50 is switched from the planting speed F1 position (first position) to the reverse speed R position (third position), it is possible to avoid switching to the specific mode simply by passing through the neutral speed N position (second position). Therefore, it is possible to suppress switching to the specific mode unintentionally by the operator.

[0101] Also, when the first operating unit 50 is in a specific operating state, if the second operating unit 60 is operated, the mode is switched to the specific mode. That is, as described above, even if the switch 61 of the second operating unit 60 is pressed after the first lever 51 of the first operating unit 50 is operated to the neutral speed N position (second position), the operation mode of the control unit 91 is switched to the specific mode (seedling succession mode). As a result, when the first lever 51 of the first operating unit 50 is in the neutral speed N position, it is possible to switch to the specific mode by a relatively simple operation of simply operating the second operating unit 60.

[0102] Furthermore, when the specific operation state of the first operating unit 50 is released in the specific mode, the specific mode is terminated. That is, as described above, when the operation mode of the control unit 91 is in the specific mode and the first lever 51 of the first operating unit 50 is switched to a position other than neutral speed N, the release condition is satisfied and the specific mode is released. This makes it relatively easy to end the specific mode and return to the normal mode.

[0103] The operation mode of the control unit 91 is displayed, for example, by the lighting state (light-emitting state) of a light-emitting unit (LED) integrated with or adjacent to the switch 61. As an example, when the control unit 91 is in the normal mode, the light-emitting unit is turned on or off, whereas when the control unit 91 is in the specific mode, the light-emitting unit flashes. Furthermore, the seedling succession non-permitted state / seedling succession permitted state may be displayed by turning the light-emitting unit off when the control unit 91 is in the seedling succession permitted state, and by turning the light-emitting unit on when the control unit 91 is in the seedling succession permitted state. This allows the operator to easily visually check the operation mode, etc., by the lighting state of the light-emitting unit.

[0104] Incidentally, during the lifting operation of the working unit 2 by the lifting device 36, it is preferable to exceptionally prohibit switching to the specific mode (seedling succession mode). That is, during the lifting operation of the working unit 2, even if a certain time has passed after the seedling succession permission state is set by operating the second operating unit 60 and the first lever 51 of the first operating unit 50 is in the position of neutral speed N, the mode is not switched to the specific mode, and the rotation speed of the driving source 11 (engine) is not reduced. In this case, when the lifting operation of the working unit 2 ends or when a certain time has passed after the lifting operation ends, the control unit 91 may switch to the specific mode and reduce the rotation speed of the driving source 11 (engine).

[0105] In short, if the rotation speed of the drive source 11 (engine) decreases during the lifting operation of the working unit 2 by the lifting device 36, the lifting speed of the working unit 2 may decrease, or the working unit 2 may not be able to be lifted. In this embodiment, during the lifting operation of the working unit 2, switching to a specific mode (seedling succession mode) is exceptionally prohibited, so that these problems caused by the reduction in the rotation speed of the drive source 11 (engine) can be avoided.

[0106] Furthermore, in this embodiment, when an operation to raise the working unit 2 is performed while the operation mode of the control unit 91 is in a specific mode and the rotation speed of the driving source 11 (engine) is at the minimum rotation speed R1, the control unit 91 returns the rotation speed of the driving source 11 (engine) to the idling rotation speed R2. At this time, the control unit 91 increases the rotation speed of the driving source 11 (engine) while stopping the transmission of the driving force of the driving source 11 to the working unit 2 by fixing the HMT speed ratio to "0". In this case, the control unit 91 may reduce the rotation speed of the driving source 11 (engine) to the minimum rotation speed R1 when the lifting operation of the working unit 2 ends or when a certain time has elapsed after the lifting operation ends.

[0107] Thus, in this embodiment, the working unit 2 is supported relative to the traveling unit 1 so that it can be raised and lowered. If the driving force is in an idling state when the working unit 2 is raised, the driving force is increased to a normal state. Here, a state in which the rotation speed of the driving source 11 (engine) is at the minimum rotation speed R1 is an example of an idling state of the driving force, and a state in which the rotation speed of the driving source 11 (engine) is at the idling rotation speed R2 is an example of a normal state of the driving force.

[0108] In short, if the rotation speed of the driving source 11 (engine) is at the minimum rotation speed R1 during the lifting operation of the working unit 2 by the lifting device 36, there is a possibility that the lifting speed of the working unit 2 will decrease or the working unit 2 will not be able to be lifted. In this embodiment, the driving force of the driving source 11 is exceptionally increased from the idling state to the normal state during the lifting operation of the working unit 2, thereby avoiding these problems.

[0109] In addition, the specific mode only needs to perform at least one of stopping the transmission of the driving force of the drive source 11 to the working unit 2 and reducing the driving force of the drive source 11 to put it into an idling state, and it is not essential to perform both of these. For example, the first operation unit 50 may have an operation lever that can change the speed like an HST operation lever, in addition to switching between forward speed F, neutral speed N, and reverse speed R. In this case, since the speed change pedal of the fourth operation unit 90 is omitted, in the specific mode (seedling change mode), there is no function of stopping the transmission of the driving force of the drive source 11 to the working unit 2, and the driving force of the drive source 11 is only reduced to put it into an idling state.

[0110] The configuration according to the third embodiment can be adopted in appropriate combination with the various configurations (including modified examples) described in the first or second embodiment.

[0111] The embodiments of the present disclosure have been described above with reference to the drawings. However, the present disclosure is not limited to the above embodiments, and can be implemented in various aspects without departing from the spirit of the present disclosure. In addition, the components disclosed in the above embodiments can be modified as appropriate. For example, a certain component among all the components shown in one embodiment may be added to a component of another embodiment, or some components among all the components shown in one embodiment may be deleted from the embodiment.

[0112] In addition, the drawings are mainly schematic illustrations of each component to facilitate understanding of the present disclosure, and the thickness, length, number, spacing, etc. of each illustrated component may differ from the actual ones due to the convenience of creating the drawings. In addition, the configurations of each component shown in the above embodiment are merely examples and are not particularly limited, and it goes without saying that various modifications are possible within a range that does not substantially deviate from the effects of the present disclosure.

[0113] (1) As described with reference to Figs. 1 to 10, in the above embodiment, when the second mode is executed, the switch 61 or the switch 61A is turned on, and when the execution of the second mode is terminated, the switch 61 or the switch 61A is turned off. However, this is not limited to the above. As shown in Fig. 14, an indicator lamp 191a may be arranged in a meter panel 191. When the second mode is executed, the indicator lamp 191a is turned on, and when the execution of the second mode is terminated, the indicator lamp 191a is turned off. As a result, the execution of the second mode can be easily recognized. Moreover, the indicator lamp is not limited to being arranged in the meter panel 191. It may be arranged in any part of the operation panel 19.

[0114] (2) As described with reference to Figs. 1 to 8, in the above embodiment, the second operation unit 60 is supported by the sign unit 80 via the attachment unit 62, but this is not limited thereto. As shown in Figs. 15 and 16, the second operation unit 60B and the sign unit 80 may be separated and supported by the support unit 40. The second operation unit 60B has a switch 61 and an attachment unit 62B. The attachment unit 62B has an end portion on the right side (Y2) supported by the support unit 40. The switch 61 is supported by an end portion on the left side (Y1) of the attachment unit 62. This allows the second operation unit 60B to be formed rotatable around the support unit 40.

[0115] (3) In the above embodiment, the first operating unit 50 and the second operating unit 60 are supported by the support unit 40 on the left Y1 side of the shaft portion 21, but this is not limited to the above. The support unit 40 may be disposed on the right Y2 side of the shaft portion 21. It is also possible to omit the support unit 40. In the case where the support unit 40 is omitted, the first operating unit 50 and the second operating unit 60 may be supported by the shaft portion 21.

[0116] (4) In the above embodiment, an example has been described in which the first lever 51 is located above the sign unit 80 at Z1 and the switch 61 is located below the sign unit 80 at Z2, but this is not limiting. The first lever 51 may be located below the sign unit 80 at Z2 and the switch 61 may be located above the sign unit 80 at Z1. The first lever 51 and the switch 61 may also be located above the sign unit 80 at Z1. The first lever 51 and the switch 61 may also be located below the sign unit 80 at Z2.

[0117] (5) In the above embodiment, when the first lever 51 is operated to either the first position A1 or the second position A2, the mechanism remains in the operated position. However, the present invention is not limited to this. When the first lever 51 is operated, the mechanism may be configured to return to the second position A2 corresponding to the neutral speed N after the gear shift is performed. In this case, the type of the operated gear may be displayed on the meter panel 191.

[0118] (6) In the above embodiment, an example has been described in which the switch 61 is an alternate switch that is separate from the steering wheel 20. However, this is not limited to this. The switch of the second operation unit may be configured as a paddle switch and disposed on the steering wheel 20.

[0119] (7) In the above embodiment, the driving source 11 is an internal combustion engine, but the present invention is not limited to this. The driving source 11 may be an electric motor.

[0120] (8) In the above embodiment, the seedling succession work is performed in the second mode, but the present invention is not limited to this. Any work related to field work or field work may be performed, including spraying work, threshing work, etc.

[0121] (9) In the above embodiment, an example has been described in which the third lever 71 of the third operation unit 70 is disposed on the dashboard 17, but this is not limiting. The third lever 71 may be disposed on the operation panel 19. The third lever 71 may also be disposed on the support portion 40, similar to the first lever 51. The first lever 51 and the third lever 71 may be a common lever, and the first lever 51 may have a function of shifting to the travel speed F2.

[0122] This application discloses the following supplementary notes, which are not intended to limit the present invention.

[0123] (Appendix 1) A driving source that generates a driving force; A traveling unit that travels by the driving force; A working unit that performs work using the driving force; A first operation unit that receives an operation to change a traveling state of the traveling unit; a second operation unit that receives an operation for switching to a specific mode that executes at least one of stopping the transmission of the driving force to the working unit and reducing the driving force to put the working unit into an idling state; A work machine comprising:

[0124] (Appendix 2) The running part has wheels, The working machine further includes a steering wheel for steering the wheels, 2. The work machine according to claim 1, wherein at least one of the first operating unit and the second operating unit is disposed below the steering wheel.

[0125] (Appendix 3) Further comprising a support portion for supporting the first operation portion, 3. The work machine according to claim 1, wherein the first operating part has a lever that rotates around the support part.

[0126] (Appendix 4) the support portion supports the lever so as to be movable among a first position, a second position, and a third position; 4. The work machine according to claim 3, wherein the traveling unit switches the traveling state in response to movement of the lever.

[0127] (Appendix 5) Further, a sign portion is provided to guide the operation direction of the lever, The label portion is A first mark shown at the first position; A second mark shown at the second position; A third mark shown in the third position; 5. The work machine according to claim 3 or 4,

[0128] (Appendix 6) 6. The work machine according to claim 5, wherein the sign portion is positioned lower than the lever.

[0129] (Appendix 7) The work machine according to claim 5 or 6, wherein the sign portion supports the second operating portion.

[0130] (Appendix 8) 8. The work machine according to claim 5, wherein an outer end of the sign portion is positioned outer than an outer end of the lever in a radial direction of a rotation axis of the lever.

[0131] (Appendix 9) The work machine according to claim 3 or 4, wherein the second operating part is arranged below the lever and at a position partially overlapping with the lever in a plan view.

[0132] (Appendix 10) The work machine according to any one of claims 3 to 9, wherein the second operating part is arranged at a position overlapping with the lever located at the second position in a plan view.

[0133] (Appendix 11) Further, a sign portion is provided to guide the operation direction of the lever, The work machine according to any one of claims 3 to 10, wherein the sign portion is disposed between the lever and the second operating portion.

[0134] (Appendix 12) 12. The work machine according to any one of claims 1 to 11, wherein when the first operation unit is in a specific operation state while the second operation unit is being operated, the work machine switches to the specific mode.

[0135] (Appendix 13) The work machine according to claim 12, wherein the work machine is switched to the specific mode after a certain time has elapsed since the first operating unit was in the specific operating state.

[0136] (Appendix 14) 14. The work machine according to any one of claims 1 to 13, wherein when the second operation unit is operated while the first operation unit is in a specific operation state, the work machine is switched to the specific mode.

[0137] (Appendix 15) 15. The work machine according to any one of claims 12 to 14, wherein the specific mode is terminated when the specific operation state of the first operation section is released in the specific mode.

[0138] (Appendix 16) The working unit is supported so as to be liftable and lowerable relative to the traveling unit, 16. The work machine according to any one of claims 1 to 15, wherein when the working part is raised, if the driving force is in the idling state, the driving force is increased to a normal state.

[0139] (Appendix 17) A driving source that generates a driving force; A traveling unit that travels by the driving force; A working unit that performs work using the driving force; A first operation unit that receives an operation to change a traveling state of the traveling unit; a second operation unit that receives an operation to switch a supply destination of the driving force between the traveling unit and the working unit; A work machine comprising: [Industrial Applicability]

[0140] The present invention is a work machine and has industrial applicability. [Explanation of symbols]

[0141] 1: Running part 2: Working section 11: Driving source 13: Front wheel (wheel) 14: Rear wheel (wheel) 20: Steering wheel 40: Support part 50: 1st operation section 51: First lever (lever) 51a: (1st operation part) outer end 60: 2nd operation section 60A: Second operating section 60B: 2nd operation section 80: Sign part 81a: (Sign part) Outer edge 100: Work machine 100A: Work machine A1 :1st position A2: 2nd position A3 :3rd position C: Rotation axis M1: First mark M2: Second mark M3: 3rd mark

Claims

1. A driving source that generates a driving force; A traveling unit that travels by the driving force; A working unit that performs work using the driving force; A first operation unit that receives an operation to change a traveling state of the traveling unit; a second operation unit that receives an operation for switching to a specific mode that executes at least one of stopping transmission of the driving force to the working unit and reducing the driving force to bring the working unit into an idling state; A work machine comprising:

2. The working machine further includes a steering wheel for steering the traveling unit, The work machine according to claim 1 , wherein at least one of the first operating part and the second operating part is disposed below the steering wheel.

3. A support portion that supports the first operation portion is further provided. The work machine according to claim 1 , wherein the first operating portion has a lever that rotates around the support portion.

4. the support portion supports the lever so as to be movable among a first position, a second position, and a third position; The work machine according to claim 3 , wherein the traveling section switches the traveling state in response to movement of the lever.

5. Further, a sign portion is provided to guide the operation direction of the lever, The label portion is a first mark corresponding to the first position; a second mark corresponding to the second position; a third mark corresponding to the third position; The work machine according to claim 4 , further comprising:

6. The work machine according to claim 5 , wherein the indicator portion is disposed below the lever.

7. The work machine according to claim 5 or 6, wherein the sign portion supports the second operation portion.

8. 7. The work machine according to claim 5, wherein an outer end of the sign portion is positioned outer than an outer end of the lever in a radial direction of a rotation axis of the lever.

9. The work machine according to claim 4 , wherein the second operating portion is disposed below the lever and at a position that partially overlaps with the lever in a plan view.

10. The work machine according to claim 9 , wherein the second operating portion is disposed at a position overlapping, in a plan view, with the lever located at the second position.

11. Further, a sign portion is provided to guide the operation direction of the lever, The work machine according to claim 9 or 10, wherein the indicator portion is disposed between the lever and the second operating portion.

12. The work machine according to any one of claims 1 to 6, wherein when the first operation unit is in a specific operation state while the second operation unit is being operated, the work machine switches to the specific mode.

13. The work machine according to claim 12, wherein the work machine is switched to the specific mode after a certain time has elapsed since the first operation unit was placed in the specific operation state.

14. The work machine according to any one of claims 1 to 6, wherein when the second operating section is operated while the first operating section is in a specific operating state, the work machine is switched to the specific mode.

15. The work machine according to claim 12, wherein the specific mode is terminated when the specific operation state of the first operation unit is released in the specific mode.

16. The working unit is supported so as to be liftable and lowerable relative to the traveling unit, The work machine according to any one of claims 1 to 6, wherein when the working part is raised, if the driving force is in the idling state, the driving force is increased to a normal state.

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