JP2014142068A - Passenger-type rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote easiness in shift operation of a travelling speed in a passenger-type rice transplanter that includes: a travelling machine body 2 having travelling wheels 5 and 6 to be driven by an engine 7; a seedling planting device 3 mounted on the rear; a travelling variable speed transmission 8 for the travelling wheels; and a speed change pedal 12 provided in a driving operation part 9 in the travelling machine body.SOLUTION: There are provided an actuator (28) for shift operating the travelling variable speed transmission (8); detecting means (24) for detecting an operation state of the speed change pedal (12); and a controller (33) for driving the actuator. The controller (33) allows the actuator (28) to drive the travelling variable speed transmission (8) to operate for speeding up or speeding down on the basis of detection results by the detecting means (24) while the unit shifting quantity of the travelling speed for the unit operation quantity of the speed change member (12) being variable.

Description

  The present invention relates to a riding type rice transplanter having a structure in which a seedling planting device is mounted on the rear part of a traveling machine body.

  In Patent Document 1 as a prior art, in the riding-type rice transplanter having the above-described configuration, a gap between a shift lever in a travel shift transmission that performs a shift of the travel and a foot-operated shift pedal provided in a driving operation unit, By mechanically interlocking with a rod or the like, the shift mission operates to increase the traveling speed by depressing the shift pedal, and the shift mission increases the traveling speed by releasing the depressing operation of the shift pedal. It is described that it is configured to operate at a reduced speed to improve its operability.

JP 2003-220933 A

  However, as in the prior art, in the case where the shift lever in the traveling shift transmission and the stepped shift pedal are mechanically connected by a rod or the like, the structure is simple, On the other hand, since the operation of the shift pedal is immediately transmitted to the traveling shift mission without delay, the traveling vehicle suddenly starts or accelerates by the depression of the shift pedal, and the depressing release operation of the shift pedal is performed. Suddenly decelerate or stop.

  In the case of sudden start or rapid acceleration, the front part of the traveling body floats up, and the seedling planting device at the rear part is lowered, resulting in a problem that the seedling planting depth for the field scene becomes deeper than a predetermined value, In addition, when the vehicle suddenly decelerates or stops suddenly, a problem arises that the traveling machine body oscillates laterally.

  Further, in the configuration of the prior art, since the shift lever and the shift pedal in the traveling shift transmission are mechanically connected by a rod or the like, not only the operation of depressing the shift pedal becomes heavy, but also the shift lever is shifted. The impact or load when operating is transmitted to the shift pedal as a so-called kickback, which causes a problem that the shift operability and the operation feeling are lowered.

  It is a technical object of the present invention to provide a traveling operation device that solves these problems.

  In order to achieve this technical problem, the invention of claim 1 includes a traveling machine body (2) having traveling wheels (5) and (6) driven by an engine (7), and a seedling planting device (3) mounted on the rear part. ), A shifting gear transmission (8) for the traveling wheels (5) and (6), and a shifting operation member (12) provided in a driving operation section (9) of the traveling vehicle body (2). In the machine (1), the actuator (28) for shifting the traveling shift transmission (8), the detecting means (24) for detecting the operation state of the shifting operation member (12), and the actuator (28) are driven. A controller (33) for controlling the travel speed change mission (8) to increase or decrease speed based on the detection result of the detection means (24). 28) together with driving the, it is that it is possible to change the unit shift amount of a traveling speed for a unit operation amount of the shift operating member (12).

  According to a second aspect of the present invention, in the riding type rice transplanter according to the first aspect, the controller (33) gradually increases the traveling speed at the initial stage of the speed increasing operation of the speed change operating member (12), In the final stage of the deceleration side operation of the speed change operation member (12), the deceleration of the traveling speed is made gentle.

  A third aspect of the present invention is the riding type rice transplanter according to the first or second aspect, further comprising a brake mechanism (19) and a clutch mechanism (18) for the traveling wheels (5) and (6), and the speed change operation member ( 12) is operated in a neutral state, the brake mechanism (19) is turned on and the clutch mechanism (18) is turned off. In the state where the speed change operation member (12) is operated to the speed increasing side, the brake mechanism (19) is operated. ) Is turned off and the clutch mechanism (18) is turned on, and the shift operation member (12), the brake mechanism (19) and the clutch mechanism (18) are interlockedly connected. .

  The invention of claim 4 is the riding type rice transplanter according to claim 3, wherein the brake mechanism (19) is turned on and the clutch mechanism (18) is turned off, and the brake mechanism (19) is turned on. A brake operation member (13) for switching to a running state in which the clutch mechanism (18) is turned off and the clutch mechanism (18) is turned on is further provided. The brake mechanism (19) and the clutch mechanism (18) include the brake operation member ( 13), the brake operation member (13) is interlocked so as to be in the stop state in preference to the speed change operation member (12) by the stop operation of the brake operation member (13).

  In the present invention, if the speed change operation member (12) is operated to the speed increasing side, the operation to the speed increasing side is detected by the detecting means (24), and the actuator (28) is operated according to the detection result, When the speed change operation (8) is accelerated by the operation of the actuator (28), the operation to the speed reduction side is detected by the detection means (24) when the speed change operation member (12) is operated to the speed reduction side. Then, the actuator (28) is operated according to the detection result, and the traveling transmission transmission (8) is decelerated by the operation of the actuator (28).

  That is, both the detection by the detection means (24) and the operation of the actuator (28) based on the detection result between the speed change operation member (12) and the travel speed change mission (8) operated thereby. This avoids sudden acceleration or sudden start when the speed change operation member (12) is operated to the speed increasing side and sudden speed reduction or sudden stop when the speed change operation member (12) is operated to the speed reduction side. Therefore, when starting or accelerating, it is possible to reduce that the seedling planting to the farm scene is deeply planted, and in addition, it is possible to reduce the sideways meandering of the traveling machine body (2) during deceleration or stopping.

  Moreover, the operation of the speed change operation member (12) to the speed increasing side is reduced by the amount of speed change operation of the travel speed change mission (8) by the actuator (28), and in addition, the operation to the speed change operation member (12). Since the load and impact when shifting the shift lever (so-called trunnion lever) of the traveling shift transmission (8) are not transmitted as so-called kickback, the shift operability and the operation feeling can be greatly improved.

  In addition, since the unit shift amount of the travel speed relative to the unit operation amount of the speed change operation member (12) can be changed, for example, at the initial stage (start) of the speed increase side operation of the speed change operation member (12), the travel speed increases. It is possible to arbitrarily set the deceleration of the running speed at the end of the deceleration-side operation (stop) of the speed change operation member (12), so that the planting can be prevented from being deeply planted and stopped. There is an advantage that the effect of preventing the lateral deviation meandering can be further promoted.

  In particular, according to the invention of claim 3, when the speed change operation member (12) is operated to be neutral, the clutch mechanism (18) is turned off, and the power transmission to the traveling wheels (5) (6) is cut off at the same time. Since the mechanism (19) is turned on and the traveling wheels (5) and (6) are stopped, the traveling machine body (2) is reliably stopped to contribute to the improvement of operability.

  Furthermore, according to the invention of claim 4, the traveling stop of the traveling machine body (2) is performed regardless of the operation by the speed change operation member (12), in other words, regardless of the operation by the speed change operation member (12). Since it can be arbitrarily executed by the operation member (13), the operability can be further improved.

It is a side view of a riding type rice transplanter. It is a top view of FIG. It is the schematic which shows a traveling speed change mission. It is a top view which shows a traveling operation apparatus. FIG. 5 is an enlarged sectional view taken along line VV in FIG. 4. FIG. 7 is an enlarged sectional view taken along line VI-VII in FIG. 4. It is a principal part enlarged view of FIG. It is a figure which shows the relationship between the amount of operation of a speed-change pedal, and the amount of shifting of traveling speed.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 and 2, reference numeral 1 denotes a riding-type rice transplanter. The riding-type rice transplanter 1 includes a traveling machine body 2 and a conventionally known multi-row planting seedling planted so as to be movable up and down. The traveling machine body 2 is configured such that the vehicle body frame 4 is supported by a pair of left and right rear wheels 6 as well as a pair of left and right front wheels 5.

  An engine 7 is mounted on the vehicle body frame 4 of the traveling machine body 2, and a traveling speed change mission 8 is configured so that power is appropriately shifted from the engine 7 and transmitted to the wheels 5 and 6. Thus, the traveling machine body 2 travels forward in the direction of arrow A by four-wheel drive.

  Furthermore, a driving operation unit 9 including a steering handle 10 and a seat 11 is provided on the upper surface of the vehicle body frame 4 in the traveling machine body 2, and the right side of the steering handle 10 on the floor surface of the driving operation unit 9 is provided. The part is provided with a foot pedal 12 for forward movement and a brake pedal 13 for forward movement, which are arranged side by side, and these pedals 12 and 13 are pivotally attached to the vehicle body frame 4. ing.

  As shown in FIG. 3, the traveling transmission mission 8 includes a variable hydraulic pump 15 that receives power from the engine 7 and a hydraulic motor 16 that is driven by hydraulic pressure from the hydraulic pump 15. The continuously variable transmission mechanism 14 is an HST type continuously variable transmission mechanism 14, and the continuously variable transmission mechanism 14 changes the inclination angle of the swash plate 15 a in the hydraulic pump 15 with the transmission lever 17, thereby changing the traveling speed of the traveling machine body 2. The speed change lever 17 is provided with spring means (not shown) for urging the speed change lever 17 in the deceleration direction.

  Further, as shown in FIG. 3, the traveling transmission mission 8 is provided with a clutch mechanism 18 for turning on / off (interrupting) power transmission to the wheels 5, 6, and the wheels 5. , 6 and a brake mechanism 19.

  Further, the travel transmission mission 8 is provided with a rotary operation shaft 20 for the brake mechanism 19, and the clutch mechanism 18 is connected to one operating member 21 fixed to the operation shaft 20 via a wire or the like. By connecting, when the one actuating member 21 is in a position indicated by a solid line in FIGS. 4 and 7, the brake mechanism 19 is on and the clutch mechanism 18 is off, The brake mechanism 19 is turned off and the clutch mechanism 18 is turned on when the vehicle is rotated backward in the direction indicated by arrow B in FIG. One of the operating members 21 or the operation shaft 20 is provided with spring means (not shown) that urges the operating member 21 to rotate in the direction of the arrow B.

  A laterally extending speed change operation shaft 22 is rotatably supported by a bearing 23 at a front portion of the vehicle body frame 4, and the right end of the speed change operation shaft 22 is connected to the speed change pedal 12. A detecting means 24 for detecting a stepping operation and a stepping release operation (described later in detail) is provided, and a sector gear 25 is fixed to the left end of the speed change operation shaft 22.

  Further, an arm 26 is fixed to the speed change operation shaft 22, and a front end of a speed change rod rod 27 extending rearward is pivotally attached to the tip of the arm 26, and an appropriate length provided at the rear end of the speed change rod rod 27. A pin 17a provided at the tip of the speed change lever 17 in the continuously variable transmission mechanism 14 of the traveling speed change transmission 8 is slidably fitted and engaged with the long groove hole 27a having the length L. The speed change mechanism 14 is in a state in which almost no power is transmitted when the speed change operation shaft 22 does not rotate and, as a result, the speed change rod rod 27 does not move rearward. The movement of the speed change rod rod 27 in the counterclockwise direction indicated by the arrow C in proportion to the rearward movement of the speed change rod rod 27 from the time when the length L of the long groove hole 27a is exceeded. And While continuously increasing the traveling speed, the speed change rod shaft 27 travels in proportion to the forward movement of the speed change rod rod 27 accompanying the clockwise rotation indicated by the arrow D in FIGS. The speed is continuously reduced.

  A pinion 29 that is rotationally driven by an electric actuator 28 meshes with the sector gear 25, and the speed change operation shaft 22 is moved by the electric actuator 28 via the sector gear 25 to the arrow C. And a counterclockwise direction indicated by the arrow D and a clockwise direction indicated by the arrow D.

  A shift pedal shaft 30 parallel to the shift operation shaft 22 is rotatably supported at the right end portion of the shift operation shaft 22, and the shift pedal shaft 30 is linked to the shift pedal 12 via an interlock mechanism 31. As a result, the shift pedal 12 is rotated clockwise as indicated by an arrow E by a stepping operation of depressing the shift pedal 12 from a standing state against a spring means (not shown), and the shift pedal 12 is released. In the step release operation of returning to the original standing posture direction by the spring means from the stepped-on position, the rotation is made in the counterclockwise direction indicated by the arrow F.

  The detection means 24 at the right end of the speed change operation shaft 22 includes a box 24a fixed to the speed change operation shaft 22, a rotor 24b rotatably provided on the box 24a, and a radially outward direction from the rotor 24b. The bifurcated arm 24c protrudes and a pair of switches 24d and 24e provided on both sides of the bifurcated arm 24c in the box 24a. The bifurcated arm 24c is connected to the shift pedal shaft 30. When the tip of the projecting arm 32 is engaged, the bifurcated arm 24c and the rotor 24b are rotated counterclockwise as indicated by an arrow E 'by a stepping operation on the speed change pedal 12. One switch 24d is switched from OFF to ON, and the shift pedal 12 is depressed from the depressed state. Rotates in a clockwise direction as indicated by an arrow F 'in releasing operation, the other switch 24e is configured to switch ON from OFF.

  The controller indicated by reference numeral 33 in FIG. 4 receives signals from both switches 24d and 24e of the detecting means 24 as input, and appropriately changes the input to output to the electric actuator 28. Both switches 24d, When one switch 24d of 24e is turned from OFF to ON, the electric actuator 28 rotates the speed change operation shaft 22 in the direction of arrow C via the sector gear 25, so that the speed change rod rod 27 is 4, as shown by a solid arrow G in FIG. 6 and FIG. 7, when the other switch 24e of both the switches 24d, 24e is turned from OFF to ON, the shift rod rod 27 is moved to FIG. As shown by a dotted arrow H in FIGS. 6 and 7, it is configured to move forward.

  As shown in FIG. 8, one operating member 21 for both the clutch mechanism 18 and the brake mechanism 19 is integrally provided with a receiving piece 21a, on which the speed change rod rod 27 is slid. A stopper piece 27b that comes into contact with the receiving piece 21a is provided at the rear end of the speed change rod rod 27 so that the speed change operation shaft 22 does not rotate, and thus the speed change rod rod 27 is provided. Is not moved backward, that is, when the shift pedal 12 is not depressed, the stopper piece 27b causes the one actuating member 21 to be turned on while the brake mechanism 19 is ON and the clutch mechanism 18 is OFF. The one actuating member 21 is shown by a two-dot chain line in FIG. 7 against its spring means by holding it in the stopped state and moving the shift rod rod 27 backward. Rotates behind the urchin arrow B, the brake mechanism 19 is configured such that the clutch mechanism 18 is OFF becomes a traveling state is ON.

  The brake pedal 13 provided in parallel with the speed change pedal 12 is configured to rotate on the brake shaft 34 that is rotatably supported on the vehicle body frame 4 by depressing the brake pedal 13. A brake rod rod 36 extending rearward is connected to the tip of an arm 35 fixed to the brake shaft 34, and the rear end portion of the brake rod rod 35 is connected to the one end as shown in FIG. In a state where the brake pedal 13 is not depressed, the stop state of the one actuating member 21 is established by slidably penetrating the locking piece 21b provided on one actuating member 21 and providing a stopper 36a at the rear end thereof. While allowing free operation from the position (shown by the solid line in FIG. 7) to the running state (position shown by the two-dot chain line in FIG. 7), When the moving member 21 is in the traveling state, the brake pedal 13 is depressed against the spring to operate the one actuating member 21 regardless of the speed change rod rod 27, in other words, the speed change gear 21. Prior to the operation on the pedal 12, the stop state can be forcibly set.

  In this configuration, when the speed change pedal 12 is not depressed, the speed change operating shaft 22 does not rotate and the speed change rod rod 27 does not move rearward. The shift lever 17 is not rotated.

  In addition, when the shift pedal 12 is not depressed, the one actuating member 21 is in a stopped state indicated by a solid line in each figure, and the power transmission is cut off when the brake mechanism 19 is ON and the clutch mechanism 18 is OFF. Therefore, the traveling machine body 2 does not travel.

  Next, when the shift pedal 12 is depressed, the shift pedal shaft 30 first rotates in the direction of arrow E. Based on this rotation, the bifurcated arm 24c and the rotor 24b in the detecting means 24 are moved in the direction of arrow E '. By rotating in the direction, one of the switches 24d and 24e in the detection means 24 is switched from OFF to ON, so that the electric actuator 28 is instructed by the controller 33, Since the speed change operation shaft 22 rotates in the direction of arrow C, the speed change rod rod 27 starts to move backward as indicated by the solid arrow G.

  When the initial movement of the speed change rod rod 27 to the rear reaches the length L of the long slot 27a at the rear end, the stopper 27b is moved rearward from the receiving piece 21a of the one actuating member 21, thereby Since one actuating member 21 rotates in a traveling state along a two-dot chain line, the brake mechanism 19 is OFF and the clutch mechanism 18 is ON.

  The rearward movement of the speed change rod rod 27 is continued by continuing the depression operation of the speed change pedal 12, and when the rearward movement exceeds the length L of the long groove hole 27a, the speed change lever 17 is Since the HST type continuously variable transmission mechanism 14 is actuated for power transmission, the traveling machine body 2 starts traveling.

  The travel speed during this travel is proportional to the further rearward movement of the speed change rod rod 27 and, consequently, the depression of the speed change pedal 12.

  When the depressing operation of the speed change pedal 12 is stopped, the controller 33 continues the rotation of the speed change operation shaft 22 in the direction of the arrow C by the electric actuator 28, so that one switch 24d in the detecting means 24 is turned on. From the ON state to the OFF state, the instruction of the controller 33 stops the rotation of the speed change operation shaft 22 in the direction of the arrow C by the electric actuator 28. As a result, the speed change rod rod 27 moves backward. Since the vehicle stops at the position, the traveling speed corresponding to the depressed position of the shift pedal 12 can be maintained.

  Next, when a depressing release operation is performed by removing the foot from the speed change pedal 12 to return the speed change pedal 12 to the original standing position with its spring means from the position where the speed change pedal 12 is stepped on to the speed change position, The pedal shaft 30 rotates in the direction of the arrow F, and based on this rotation, the bifurcated arm 24c and the rotor 24b in the detection means 24 rotate in the direction of the arrow F ', thereby both switches 24d in the detection means 24, When the other switch 24e of 24e is switched from OFF to ON, the electric actuator 28 rotates the shift operation shaft 22 in the direction of the arrow D in response to an instruction from the controller 33. The rod rod 27 moves forward as indicated by the dotted arrow H.

  As the speed change rod rod 27 moves forward as indicated by the dotted arrow H, the speed change lever 17 rotates rearward and the HST type continuously variable speed change mechanism 14 operates to decelerate. Decelerated.

  By holding the shift pedal 12 in a state in which the stepping release operation is stopped halfway, the controller 33 continues to rotate the shift operation shaft 22 in the direction of the arrow D by the electric actuator 28. The other switch 24e in the detecting means 24 is turned from ON to OFF, and the instruction of the controller 33 stops the rotation of the speed change operation shaft 22 in the direction of the arrow D by the electric actuator 28. Since the forward movement of the rod rod 27 stops at that position, the traveling speed can be maintained in the decelerated state described above.

  When the shift pedal 12 returns to the original standing position, the shift lever 17 returns to the original position so that the HST continuously variable transmission mechanism 14 hardly transmits power. Since the two actuating members 21 are in a stopped state in which the brake mechanism 19 is ON and the clutch mechanism 18 is OFF, the traveling of the traveling machine body 2 is stopped.

  In this way, when starting and accelerating by depressing the shift pedal 12, the depressing of the shift pedal 12 is detected by the detecting means 24, and based on this detection, the actuator 28 is driven by the travel shift mission via the controller 33. 8 is operated by increasing the speed. On the other hand, the depressing release operation is detected by the detecting means 24 at the time of decelerating and stopping by depressing the shift pedal 12, and the actuator 28 travels in response to the detection. The speed change mission 8 is operated by decelerating. Between the speed change pedal 12 and the travel speed change mission 8 operated thereby, the detection by the detecting means 24 and the actuator 28 based on the detection are detected. Both of the operation and the operation of the shift pedal 12 when the depressing operation is performed. Rapid acceleration or sudden acceleration of Te, and can avoid abrupt deceleration or sudden stop of the time depressing the releasing operation of the shift pedal.

  In addition to this, the depressing operation force on the shift pedal 12 can be reduced by the shift operation of the travel transmission mission 8 by the actuator 28. In addition, the shift lever 17 of the travel shift mission 8 is attached to the shift pedal 12. It can be avoided that the load and impact during the shifting operation are transmitted as so-called kickback.

  By the way, the controller 33 has a function that can change the unit shift amount at the traveling speed with respect to the unit operation amount at the shift pedal 12.

  That is, FIG. 8 is a diagram showing the relationship between the operation amount S of the shift pedal 12 and the shift amount W of the traveling speed, and the relationship is the primary straight line X indicated by a solid line, whereby the shift pedal 12 is shown. The unit shift amount ΔW at the running speed with respect to the unit operation amount ΔS at is set so as to be linearly proportional over the entire region, or is set as a downwardly convex quadratic curve Y indicated by a two-dot chain line. The unit shift amount at the running speed with respect to the unit operation amount ΔS in the pedal 12 is reduced from ΔW when the linear proportional operation is performed to ΔW ′ in the initial region of the depression operation of the shift pedal 12, and then the depression operation of the shift pedal 12 is performed. It can be set to increase in proportion to the amount.

  By setting the latter, the speed increase of the traveling speed is moderated at the initial stage of the operation of depressing the shift pedal 12 (when starting), and the travel is performed at the end of the depressing operation of the shift pedal 12 (when stopping). Since the deceleration of the speed can be made gentle, it is possible to further promote the effects of preventing deep planting at the start and preventing lateral slippage at the time of stopping.

  Further, when setting the relationship between the operation amount S of the shift pedal 12 by the controller 33 and the shift amount W of the traveling speed, in addition to the primary straight line X or the downward convex quadratic curve Y, the primary straight line X , The shape of the downward convex quadratic curve Y can be changed, or an upward convex quadratic curve can be used, and a primary straight line or a quadratic curve can be used for the depression operation of the shift pedal 12. It is possible to set so that the time is different from that at the time of the depression release operation.

  In the above-described embodiment, the drive rotational speed of the engine 7 is automatically changed according to the shift operation in the traveling shift transmission 8.

  That is, as shown in FIG. 6, when the cam gear 37 is provided with a cam groove 37 extending in the circumferential direction, the cam gear 37 is provided with the speed change operating shaft 22 whose start end 37a is the center of the fan gear 25. The rotation direction of the sector gear 25 in the direction of the arrow C, that is, the traveling speed is increased so that the end 37b is located at a portion of a small radius R2 from the speed change operation shaft 22 while being located at a portion of a large radius R1. It is configured to incline so as to gradually approach the center of rotation as the rotational direction increases.

  The cam arm 37 is slidably engaged with a tip of a first arm 39 protruding from a horizontal shaft 38 rotatably supported on the vehicle body frame 4, and a second arm 40 fixed to the horizontal shaft 38. And the accelerator lever 7a in the engine 7 are connected by a wire 41 or the like.

  In this configuration, the accelerator lever 7a moves against the return spring means 7b in the cam groove 37 in accordance with the rotation direction of the sector gear 25 in the direction of the arrow C, that is, in accordance with the increase in travel speed. Since the engine 7 rotates in the direction indicated by J, the rotational speed of the engine 7 is automatically increased in proportion to the increase in traveling speed from the idle rotation.

  On the other hand, according to the direction of rotation of the sector gear 25 in the direction of the arrow D, that is, in accordance with the reduction of the traveling speed, the accelerator lever 7a is returned by the return spring means 7b in the cam groove 37. Therefore, the rotational speed of the engine 7 is automatically reduced in proportion to the reduction in travel speed, and becomes idle when travel stops.

  Of course, the rotational speed of the engine 7 can be arbitrarily changed by manually rotating the accelerator lever 7a.

DESCRIPTION OF SYMBOLS 1 Riding type rice transplanter 2 Traveling machine body 3 Seedling planting device 4 Body frame 5 Front wheel 6 Rear wheel 7 Engine 8 Traveling transmission mission 9 Driving operation part 12 Shift pedal 13 Brake pedal 14 HST type continuously variable transmission mechanism 17 Shift lever 18 Crack mechanism 19 Brake mechanism 21 Actuating member 22 Shifting operation shaft 24 Detecting means 25 Shifting fan-shaped gear 27 Shifting rod rod 28 Actuator 33 Controller

Claims (4)

A traveling machine body (2) having traveling wheels (5) and (6) driven by an engine (7), a seedling planting device (3) mounted on the rear portion, and a traveling shift with respect to the traveling wheels (5) and (6) In a riding type rice transplanter (1) comprising a mission (8) and a speed change operation member (12) provided in a driving operation section (9) in the traveling machine body (2),
An actuator (28) for shifting the travel transmission mission (8), a detecting means (24) for detecting an operating state of the shifting operation member (12), and a controller (33) for driving the actuator (28); With
The controller (33) drives the actuator (28) so as to speed up or decelerate the traveling speed change mission (8) based on the detection result of the detection means (24), and the speed change operation member ( 12) The unit shift amount of the traveling speed with respect to the unit operation amount can be changed.
Riding type rice transplanter. The controller (33) moderates the increase in travel speed at the initial stage of the speed increase operation of the speed change operation member (12), and reduces the travel speed at the end of the speed reduction operation of the speed change operation member (12). Gradual,
The riding type rice transplanter according to claim 1. A brake mechanism (19) and a clutch mechanism (18) for the traveling wheels (5) and (6);
When the speed change operation member (12) is operated in a neutral state, the brake mechanism (19) is turned on and the clutch mechanism (18) is turned off. When the speed change operation member (12) is operated to the speed increasing side, The shift operation member (12), the brake mechanism (19) and the clutch mechanism (18) are interlocked and connected so that the brake mechanism (19) is turned off and the clutch mechanism (18) is turned on. Yes,
The riding type rice transplanter according to claim 1 or 2. Switching operation between a stop state in which the brake mechanism (19) is turned on and the clutch mechanism (18) is turned off, and a running state in which the brake mechanism (19) is turned off and the clutch mechanism (18) is turned on. A brake operating member (13)
The brake mechanism (19) and the clutch mechanism (18) stop the brake operation member (13) in preference to the speed change operation member (12) by a stop operation of the brake operation member (13). Linked to be in a state,
The riding type rice transplanter according to claim 3.

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