JP2012245962A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle that can easily switch between connection and non-connection of brake pedals without increasing the burden on a worker and operating according to a work condition.SOLUTION: A travelling vehicle provided with an engine, front wheels, rear wheels, a seedling planting part, right and left side clutches, right and left side brakes, right and left brake pedals 130 that can operate the right and left side clutches and the right and left side brakes, a subsidiary speed change lever and a subsidiary speed change lever sensor includes a switching device 140 for switching the right and left brake pedals 130 between connection and non-connection and a control device for connecting the right and left brake pedals 130 by operating the switching device 140 when the subsidiary speed change lever is at high speed. Stopping operation can be easily carried out since the right and left brake pedals 130 are connected in advance travelling at high speed. Meanwhile, an operation corresponding to the working condition can be carried out since the right and left brake pedals 130 are not connected in low speed.

Description

  The present invention relates to a brake operation mechanism for a work vehicle such as a tractor or a seedling transplanter.

  As a brake operation mechanism for work vehicles such as tractors, the brake operation can be performed simply by depressing the tread surface of the parking brake pedal regardless of the braking operation of the parking brake and the method of pressing the parking brake pedal. There is a configuration in which braking can be released by simply depressing a certain parking brake pedal and then returning it (Patent Document 1 below).

  Specifically, when the left and right side brakes are released, the left and right side brakes enter the braking state when the parking brake pedal is stepped down, and the parking brake pedal is depressed from this braking state. A mechanism is provided for releasing the braking of the side brake in a braking state by depressing the surface again. The left and right side brake pedals are engaged by an engagement lock member, and the left and right side brakes can be simultaneously operated in a braking state by simultaneously depressing both the left and right side brake pedals.

Further, in a work vehicle such as a seedling transplanter, left and right steering brake pedals are connected together by an interlocking rod and used as a brake for stopping traveling (Patent Document 2 below).
And the working vehicle of the agricultural machine shown in patent document 1 and patent document 2 is provided with the left and right brake pedals for operating the left and right side clutches and the side brakes, and the connection of the left and right side brake pedals according to the working conditions. This is a configuration that allows the left / right interlock and the left / right independent operation by switching the unconnected state.

JP 2010-268747 A JP 2009-190616 A

  However, when working vehicles such as agricultural implements travel at high speed on the road, or when traveling on slopes such as farm entrances and loading routes to transportation vehicles, forget to connect the left and right brake pedals If it is in a state where it can be operated, the aircraft will turn suddenly to the left or right when the left or right brake pedal is depressed, and the aircraft will run in a direction not intended by the operator. .

Also, if you forget to release the left and right brake pedals when working on the field, if the left or right brake pedal is depressed while the work vehicle is turning at the end of the field, the running will stop. Therefore, there is a problem that the turning operation intended by the operator cannot be performed, the field edge is roughened, and the end position of the turning is away from the position intended by the operator.
The connection between the left and right brake pedals is often forgotten because the operator manually performs the connection according to the working conditions.

  An object of the present invention is to provide a work vehicle that can easily switch between connection and non-connection of left and right brake pedals without burdening an operator, and that can be operated in accordance with work conditions.

The above-described problems of the present invention are solved by the following solution means.
The invention according to claim 1 includes an engine (20), a pair of left and right traveling devices (10, 11) that travels on a field with the driving force of the engine (20), and the traveling device (10, 11). A vehicle body (2), a working part (4) provided on the rear part of the vehicle body (2) to freely move up and down and planting seedlings in a farm field, and transmission from the engine (20) to the traveling vehicle body (2) are turned on and off. Left and right side clutches (I, I), left and right side brakes (J, J) of the traveling vehicle body (2), the left and right side clutches (I, I) and the left and right side brakes (J, J) Left and right brake pedals (130, 130) that can be operated, a shift lever (16) that can operate the traveling devices (10, 11) at a plurality of shift positions on the high speed side and the low speed side, Shift lever for detecting the operating position of the lever (16) A switching device (140) for switching between a connected state in which the left and right brake pedals (130, 130) are linked and linked and a non-linked state in which the left and right brake pedals (130, 130) are linked in the traveling vehicle provided with the detection means (165); When the position detected by the lever detection means (165) is on the high-speed side, the control device having a shift lever switching function for operating the switching device (140) to connect the left and right brake pedals (130, 130). 100).

  According to a second aspect of the present invention, the left and right brake pedals (130, 130) are provided with brake pedal position detecting means (133) for detecting a distance between the left and right brake pedals (130, 130), and the control device ( 100), when the distance detected by the brake pedal position detecting means (133) is equal to or less than a predetermined value, the switching device (140) is operated to bring the left and right brake pedals (130, 130) into a connected state. The work vehicle according to claim 1, further comprising a brake pedal switching function.

  Invention of Claim 3 provides the alerting | reporting means (145,147) which can alert | report by auditory or visual sense, and the said control apparatus (100) has the distance detected by the said brake-pedal-position detection means (133) predetermined value. And the notification means (145, 147) is turned on until the distance detected by the brake pedal position detection means (133) becomes a predetermined value or less. It is a work vehicle of Claim 2 which has the alerting | reporting function to operate.

  According to a fourth aspect of the present invention, the vehicle body (2) is provided with a front / rear inclination detecting means (151) for detecting an inclination angle of the vehicle body (2) in the front / rear direction with respect to a horizontal plane of the field, and the control device (100) includes: When the inclination angle detected by the front / rear inclination detecting means (151) becomes equal to or greater than a predetermined angle, the front / rear inclination switching function for operating the switching device (140) to connect the left and right brake pedals (130, 130). It is a work vehicle of Claim 1 or 2 which has these.

  According to a fifth aspect of the present invention, the traveling device (10, 11) includes a pair of left and right front wheels (10, 10) and a pair of left and right rear wheels (11, 11), and the pair of left and right rear wheels (11, 11). ) For detecting the number of revolutions of the rear wheel, and the control device (100) determines the traveling speed from the number of revolutions for a predetermined time detected by the means for detecting the number of rear wheel revolutions (153). 2. A travel speed switching function for calculating and operating the switching device (140) to connect the left and right brake pedals (130, 130) when the calculated travel speed exceeds a predetermined speed. 4. The work vehicle according to claim 1.

  According to a sixth aspect of the present invention, steering angle detection is provided in which steering means (34) of the traveling device (10, 11) is provided on the vehicle body (2) and the steering angle by the steering means (34) is detected. Means (157), and the control device (100) determines that the work vehicle is in a straight traveling state when the steering angle detected by the steering angle detection means (157) is less than a predetermined angle. When the switching device (140) is operated to connect the left and right brake pedals (130, 130), the steering angle detected by the steering angle detection means (157) is greater than a predetermined angle. 6. The steering angle switching function according to claim 1, further comprising a steering angle switching function for determining that the vehicle is in a turning state and operating the switching device (140) to disconnect the left and right brake pedals (130, 130). Or a work vehicle according to claim 1. .

  The invention according to claim 7 is provided with a height detecting means (160) for detecting a height from the lowest position in the working state of the working part (4), and the traveling device (10, 11) is provided with a traveling distance. A travel distance detecting means (153) for detecting is provided, and the height detecting means (160) detects that the height of the working part (4) is not less than a predetermined height, and the state exceeds a predetermined time. Or the height detection means (160) detects that the height of the working part (4) is equal to or higher than a predetermined height, and the travel distance detection means (153) determines the travel distance. When it is detected that the distance is equal to or greater than the predetermined distance, the control device (100) determines that the working unit (4) is in a non-working state and operates the switching device (140) to operate the left and right Connect the brake pedal (130, 130). A working vehicle according to any one of claims 1 to 6, having a working unit switching function of the state.

According to an eighth aspect of the present invention, the switching device (140) is configured by an electromagnet (142) provided on the left and right brake pedals (130, 130), and the control device (100) is connected to the electromagnet (142). By energizing the left and right brake pedals (130, 130), the left and right brake pedals (130, 130) are disconnected from each other by stopping energization of the electromagnet (142). The work vehicle according to claim 1, having an electromagnet switching function.
In the present specification, the left and right directions in the forward direction of the work vehicle are referred to as left and right, respectively.

  According to the first aspect of the present invention, when the operating position of the speed change lever (16) is operated to the high speed side, the left and right brake pedals (130, 130) are connected by the switching device (140). When the vehicle is traveling straight at high speed, the left and right side brakes (J, J) and side clutches (I, I) are operated regardless of which of the left and right brake pedals (130, 130) is depressed. A sudden turn in the left or right direction is prevented, and the aircraft can be easily stopped.

  When the operation position of the speed change lever (16) is not operated to the high speed side, the left and right brake pedals (130, 130) are disconnected by the switching device (140), so that the work vehicle turns at the field end. The turning distance and turning trajectory can be changed by stepping on either the left or right brake pedal (130) and operating the left or right side brake (J, J) and side clutch (I, I). it can. Therefore, since operation according to work conditions, such as a field shape and soil quality, can be performed, the work start position after turning can be easily adjusted to the adjacent strip, and work accuracy is improved.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, when the distance detected by the brake pedal position detecting means (133) is not more than a predetermined value, that is, the left and right brake pedals (130). , 130) are detected to be adjacent to each other, the left and right brake pedals (130, 130) are connected to each other, so that either the left or right brake pedal (130) is left operated. Since it can prevent that a pedal (130,130) will be in a connection state, it does not start turning operation | movement which an operator does not intend, but operativity improves.

  Then, when the adjoining of the left and right brake pedals (130, 130) is detected and the operating position of the speed change lever (16) is operated to the high speed side, the left and right brake pedals (130, 130) are connected. Therefore, when the left and right brake pedals (130, 130) are adjacent to each other, the left and right side clutches (I, I) and the side brakes (J, J) can be engaged regardless of which of the left and right brake pedals (130, 130) is depressed. Since it can be operated, the aircraft can be easily and reliably stopped.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, the distance detected by the brake pedal position detecting means (133) exceeds a predetermined value, and the state is maintained for a predetermined time. If the alarm means (145, 147) is activated, the operator is informed that either one of the left and right brake pedals (130, 130) has been operated. You can be surely noticed. Therefore, it is possible to prevent the operator from forgetting to put the left and right brake pedals (130, 130) in the connected state before the work vehicle travels on the road.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 1 or 2, the longitudinal inclination detecting means (151) detects the inclination of the vehicle body (2) in the front-rear direction that is greater than a predetermined angle. Then, the left and right brake pedals (130, 130) are switched to the connected state, so that the left and right brake pedals (130, 130) can be securely connected when the work vehicle moves through the entrance / exit of the field or loads on the transport vehicle. Since they can be connected, erroneous operation of the left and right brake pedals (130, 130) in a state where they are tilted back and forth is prevented, and work efficiency is improved.

  In the field work, the vehicle body (2) is largely tilted back and forth when traveling on a slope at the entrance / exit of the field or on a transport step for loading onto the truck bed. But no. Therefore, if the left and right brake pedals (130, 130) can be operated separately, the vehicle will turn left or right, but this can be prevented.

  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, the left and right brake pedals (130, 130) when the traveling speed of the work vehicle exceeds a predetermined speed. ) Is switched to the connected state, so that the left and right brake pedals (130, 130) can be reliably interlocked during high-speed traveling, so that the turning operation unintended by the operator is not started and the operation of the work vehicle is performed. Improves.

  According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 5, the steering angle by the steering means (34) is less than a predetermined angle (straight-running state). If there is, the left and right brake pedals (130, 130) are connected, while if the steering angle by the steering means (34) is equal to or greater than a predetermined angle (turning state), the left and right brake pedals (130, 130) are not connected. By being in the connected state, it is possible to prevent the operator from making unintentional turning motions even if the left and right brake pedals (130, 130) are stepped on when the work vehicle is working while traveling straight ahead. It becomes straight and work accuracy is improved.

  Further, during the turning of the work vehicle, the control device (100) accepts the operation of the left and right brake pedals (130, 130) independently, so that the work is performed by the operator operating the left and right brake pedals (130, 130). The turning distance and turning trajectory when the vehicle turns at the field end can be changed. Therefore, it is possible to perform operations in accordance with work conditions such as the shape of the field and soil quality, and it is easy to adjust the work start position after turning to the adjacent strip, and work accuracy is improved.

  According to the invention described in claim 7, in addition to the effect of the invention described in any one of claims 1 to 6, a predetermined time elapses in a state where the working part (4) is raised to a predetermined height or more. If the work vehicle has traveled a predetermined distance with the working unit (4) raised above a predetermined height, the control device (100) is in a non-working state (a state where no planting is performed). Since the left and right brake pedals (130, 130) are switched to the connected state based on the determination, the left and right brake pedals (130, 130) are reliably interlocked when the work vehicle travels with the working unit (4) raised. Therefore, the turning operation unintended by the operator is not started in the non-working state of the work vehicle, and the operability of the work vehicle is improved.

  According to the invention described in claim 8, in addition to the effect of the invention described in any one of claims 1 to 7, the left and right brakes are generated by an electric signal from the control device (100) to the electromagnet (142). Since connection and non-connection of the pedals (130, 130) can be switched, the connection operation of the left and right brake pedals (130, 130) is automated, and the work efficiency is improved.

  In addition, since it is not necessary for the operator to manually operate the connecting member that connects the left and right brake pedals (130, 130), the labor of the operator is reduced and the left and right brake pedals (130, 130) are attached. Forgetting to connect and forgetting to release the connection are prevented, and the operability and work accuracy of the work vehicle are improved.

It is a side view of the riding type seedling transplanter of the Example of this invention. It is a top view of the riding type seedling transplanter of FIG. It is a transmission mechanism figure of the riding type seedling transplanter of FIG. It is sectional drawing of the side clutch and side brake part of the mission case of the riding type seedling transplanter of FIG. FIG. 5 is a partially enlarged view of FIG. 4. A plan view of the left and right brake pedals of the riding seedling transplanter of FIG. 1 (FIG. 6A) and a view taken along the line S-S of FIG. 6A (FIGS. 6B and 6C) It is. It is a block diagram of the control apparatus of the riding type seedling transplanter of FIG. It is the figure which showed an example of the flow by the control apparatus of the riding type seedling transplanter of FIG. It is the figure which showed an example of the flow by the control apparatus of the riding type seedling transplanter of FIG. It is the figure which showed an example of the flow by the control apparatus of the riding type seedling transplanter of FIG. It is the figure which showed an example of the flow by the control apparatus of the riding type seedling transplanter of FIG. It is the figure which showed an example of the flow by the control apparatus of the riding type seedling transplanter of FIG. It is the figure which showed an example of the flow by the control apparatus of the riding type seedling transplanter of FIG. It is a side view of the cockpit of the riding type seedling transplanter of FIG. It is another example of the side view of the cockpit of the riding type seedling transplanter of FIG. It is another example of the side view and rear view of the cockpit of the riding type seedling transplanter of FIG. It is another example of the side view and rear view of the cockpit of the riding type seedling transplanter of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 and 2 are a side view and a plan view of a riding seedling transplanter as an embodiment of a work vehicle. In this riding type seedling transplanter 1, a seedling planting portion 4 as a working portion is mounted on the rear side of the vehicle body frame 2 via a lifting link device 3 so as to be lifted and lowered.

The riding seedling transplanting machine 1 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 as drive wheels, and a transmission case 12 is disposed at the front of the fuselage. Front wheel final cases 13, 13 are provided on the left and right sides of the transmission case 12, and the left and right front wheels project outward from the respective front wheel support portions capable of changing the steering direction of the left and right front wheel final cases 13, 13. The left and right front wheels 10, 10 are respectively attached to the axles 10a, 10a.
A seedling planting portion 4 is mounted on the rear side of the vehicle body frame 2 via the lifting link device 3 so as to be movable up and down, and a main body portion of the fertilizer application device 5 is provided on the rear upper side of the vehicle body frame 2.

  Further, the front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, and a rear wheel rolling shaft (not shown) provided horizontally in the front and rear at the center of the rear end of the main frame 15 is used as a fulcrum. The rear wheel gear cases 18 and 18 are supported in a freely rolling manner, and the rear wheels 11 and 11 are attached to the rear wheel axles 11a and 11a protruding outward from the rear wheel gear cases 18 and 18, respectively.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission case 12 via a hydrostatic continuously variable transmission (HST) 23 and the like. The rotational power transmitted to the transmission case 12 is shifted by the main transmission and the auxiliary transmission in the transmission case 12 and then separated into the traveling power and the external take-out shaft.

 A part of the driving power from the engine 20 through the HST 23 is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the rest is transmitted to the rear wheel gear cases 18 and 18 to transmit the rear wheels 11 and 13. 11 is driven. Further, the external take-out power is transmitted to a planting clutch case (not shown) provided at the rear portion of the vehicle body frame 2, and then transmitted to the seedling planting unit 4 by the planting transmission shaft 26.

A cockpit 31 is installed in the upper part of the engine 20, a front cover 32 incorporating various operation mechanisms is provided in front of the cockpit 31, and a handle 34 for steering the front wheels 10, 10 is provided above the front cover 32. It has been. The left and right sides of the lower end of the front cover 32 are horizontal floor steps 35. The floor step 35 is provided with a number of holes (see FIG. 2), and mud on the shoe of the worker walking through the step 35 falls to the field. The rear part on the floor step 35 is a rear step 36 that also serves as a rear wheel fender.
In addition, on the left and right sides of the front part of the vehicle body frame 2, a spare seedling stage 38 on which supplementary seedlings are placed may be provided. The elevating link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. These links 40, 41, 41 are pivotally attached to a rear-view portal-shaped link base frame 42 erected on the rear end of the main frame 15, and a vertical link 43 is connected to the tip side thereof. ing.

 And the connecting shaft 44 rotatably supported by the seedling planting part 4 is inserted and connected to the lower end part of the vertical link 43, and the seedling planting part 4 is connected so as to be able to roll around the connecting shaft 44. An elevating hydraulic cylinder 46 is provided between a support member fixed to the main frame 15 and a tip of a swing arm (not shown) integrally formed with the upper link 40, and the cylinder 46 is expanded and contracted hydraulically. As a result, the upper link 40 rotates up and down, and the seedling planting part 4 moves up and down while maintaining a substantially constant posture.

  The pair of left and right drawing marker seedling planting parts 4 has a four-row planting structure, a transmission case 50 that also serves as a frame, a mat seedling, and a left-and-right reciprocating movement to each seedling outlet 51a,... When all the seedlings for one horizontal row are supplied to the seedling outlet 51a,..., The seedling stage 51 for transferring the seedlings downward by the seedling feeding belt 54,..., And the seedlings supplied to the seedling outlet 51a,. , And a pair of left and right drawing markers (not shown) for drawing the course of the machine body in the next process to the topsoil surface. In the lower part of the seedling planting part 4, a center float 55 is provided in the center, and side floats 56, 56 are provided on the left and right sides thereof.

  When these floats 55, 56, 56 are grounded on the mud surface of the field, the aircraft moves forward, and the floats 55, 56, 56 slide while leveling the mud surface. Seedlings are planted by. Each of the floats 55, 56, and 56 is rotatably attached so that the front end side thereof moves up and down according to the unevenness of the soil surface of the field, and the vertical movement of the front part of the center float 55 is a float inclination angle sensor during planting work. The planting depth of the seedling is always maintained constant by switching the hydraulic valve that controls the lifting hydraulic cylinder 46 according to the detection result to raise and lower the seedling planting unit 4. To do.

  A rotor 27 (27a, 27b) which is an example of a leveling device is attached to the seedling planting unit 4. A rotor cover 37 is provided on the upper rear side of the leveling rotors 27a and 27b so that mud is not applied to the floats 55 and 56.

  The fertilizer applicator 5 feeds the granular fertilizer stored in the fertilizer hopper 60 by a certain amount by the feeding portions 61,... And applies the fertilizer to the left and right sides of the floats 55, 56, 56 with the fertilizer hoses 62,. Guide to a guide (not shown), ..., and drop into a fertilization groove formed in the vicinity of the side of the seedling planting line by a grooved body 64 (Fig. 1) provided on the front side of the fertilization guide, ... It has become. Air generated by the blower 58 driven by the blower electric motor 53 is blown into the fertilizer hose 62 via the air chamber 59 that is long in the left-right direction, and the fertilizer in the fertilizer hose 62 is forcibly conveyed by wind pressure. It has become.

  FIG. 3 is a transmission mechanism diagram of the riding seedling transplanter 1 of FIG. 1, and FIG. 4 is a cross-sectional view of the side clutch and side brake portion of the transmission case 12 of the riding seedling transplanter 1 shown in FIG. Indicates. FIG. 5 shows a partially enlarged view of FIG.

  The rotational power of the engine 20 is transmitted from a hydraulic continuously variable transmission (HST) 23 to a transmission such as a main transmission (not shown), an auxiliary transmission (not shown), or the like.

  Rear axles 105 and 105 (FIG. 3) and front axles 107 and 107 are supported at the rear of the mission case 12. One of the gears constituting the sub-transmission gear mechanism C meshes with the output gear B mounted on the output shaft of the HST 23, the sub-transmission gear mechanism C and the transmission gear D mesh, and this transmission gear D engages with the front axles 107 and 107. By meshing with the shaft-mounted input gear E, the front wheel axles 10a and 10a rotate via the front axles 107 and 107, and the front wheels 10 and 10 rotate.

  The left and right output bevel gears are attached to the front axles 107, 107, and the input bevel gears that mesh with the output bevel gears are attached to the side clutch shafts 76, 76. Further, the rear output shafts 109, 109 at the rear end portions of the side clutch shafts 76, 76 are connected to the front end portions of the left and right rear wheel input shafts 103, 103. A rear output bevel gear is attached to the rear ends of the rear wheel drive shafts 103, 103. The rear output bevel gear meshes with the rear input bevel gear attached to one side of the rear axles 105, 105, and the other side. The output spur gear is attached to the rear spur gear, and the input spur gear attached to the rear wheel axles 11a, 11a is engaged with the output spur gear, whereby the driving force is transmitted to the rear wheels 11, 11.

  The side clutch shafts 76 and 76 are transmitted to the rear output shafts 109 and 109 via the side clutches I and I. The side clutch I is a multi-plate clutch and includes a friction plate 111. The leaf spring 113 urges the friction plate 111 in a pressing direction (a structure in which the friction plate 111 is pushed by the clutch 113 and the brake case 116 being pushed to the front of the machine body by the spring 113). It is in a state where power is transmitted.

  When the clutch-side shim 115 moves in the direction of the arrow X, the clutch / brake case 116 also moves in the direction of the arrow X, but the position of the fixed plate 114 (not stationary) provided between the side clutch I and the leaf spring 113. Remains unchanged, the leaf spring 113 is compressed by the fixing member. On the other hand, the friction plate 111 is disengaged from the leaf spring 113, disengaged, and the side clutch I is disengaged (power is cut off).

  Further, side brakes J, J are provided on the rear output shafts 109, 109. The side brake J presses the disc 118 attached to the rear output shaft 109 to brake it, and this operation is performed by operating the brake shim 117. That is, the side clutch I is normally engaged and the side brake J is not applied (disengaged). When the clutch-side shim 115 moves in the direction of the arrow X to compress the leaf spring 113, the side clutch I is disengaged. Further, when the shim 117 on the brake side hits the disk 118 and pushes the disk 118, the side brake J is applied (entered).

The on / off operation of the side clutches I and I and the side brakes J and J is performed by the left and right brake pedals 130 (FIG. 1) provided on the floor step 35.
During normal travel when the brake pedal 130 is not depressed, the aircraft travels at the set travel speed.

  When the brake pedal 130 is depressed, the brake arm 120 connected to the brake pedal 130 is activated. The brake arm 120 is a member different from the brake pedal arm 132 shown in FIG. Since the connecting mechanism from the brake pedal 130 to the brake arm 120 is complicated, the illustration is omitted.

  When the brake pedal 130 is depressed and the brake arm 120 is operated to the A stage and rotated to the front side of the machine body, the half-moon shaped brake arm shaft 122 also rotates and the flat portion of the brake arm shaft 122 pushes one side of the shim 115 to the left and right. By moving in the direction (rear side of the machine) (moving from the reference point O to the dotted line A1), the side clutch I is disengaged. When the side clutch I is disengaged, the driving force is not transmitted to the rear wheel 11. If only one of the left and right side clutches I is disengaged, the vehicle is turned. If both the side clutches I and I are disengaged simultaneously, the inertial drive is performed. Stop after. In the case of the riding seedling transplanter 1, since it travels at a low speed, it stops at a relatively short distance. At this time, since the side brake J is off, there is no braking action by the side brake J.

  When the brake pedal 130 is further depressed and the brake arm 120 is operated to the B stage, the clutch-side shim 115 moves to the dotted line B1, and the brake-side shim 117 pushes the disc 118, whereby the side brake J is applied. At this time, the side clutch I is turned off, the side brake J is turned on, and the rotation of the rear wheel 11 is forcibly stopped. Therefore, when either the left or right side brake J is operated, the aircraft turns more rapidly. If both side brakes J and J are engaged at the same time, the vehicle stops almost on the spot.

  FIG. 6A shows a plan view of the left and right brake pedals 130 and 130 (seen from above while sitting on the cockpit 31). 6 (b) and 6 (c) show arrow SS line arrow views of FIG. 6 (a), and FIG. 7 shows a control device (CPU) 100 of the riding seedling transplanter 1. The block diagram of is shown. 6C is the position of the pedal 130 when the vehicle stops when the brake pedal 130 is depressed. In this figure, the right brake pedal 130 is depressed, and the left brake pedal 130 is depressed. The state where it is necessary to adjust the left and right positions by stepping on is shown.

The riding seedling transplanter 1 according to this embodiment includes a switching device 140 that switches between a connected state in which the left and right brake pedals 130 are connected and interlocked and a non-connected state in which the left and right brake pedals 130 are not interlocked.
The switching device 140 is composed of electromagnets 142 provided on the left and right brake pedals 130, 130. Specifically, the electromagnet 142 is attached to either the left or right brake pedal arms 132, 132 by a fixture such as a pin 135. It is attached.

  The control device (CPU) 100 energizes the electromagnet 142 to bring the left and right brake pedals 130 and 130 into a connected state where they are adjacent to each other, while the electromagnet 142 is deenergized so that the left and right brake pedals 130 and 130 are connected. It has an electromagnet switching function for disengagement that is not interlocked.

  As shown in FIG. 6, an electromagnet 142 is attached to the right side of the left brake pedal arms 132, 132. The tip of the pin 135 penetrates the left brake pedal arm 132 and is fitted into the electromagnet 142. When the electromagnet 142 is energized by the control device 100, the electromagnet 142 adheres to the right brake pedal arm 132. In the illustrated example, the electromagnet 142 is attached to the left brake pedal arm 132, but it may be attached to the right brake pedal arm 132.

  Normally, the left and right brake pedals 130 and 130 are connected by a brake connecting member such as a plate, and the left and right brake pedals 130 and 130 are connected or disconnected by attaching or removing the plate. Yes. However, the operator may forget to operate this plate.

  If you have forgotten the operation of connecting the plates, stepping on the left or right brake pedal 130 (also referred to as a single brake) when the riding seedling transplanter 1 travels on the road (non-working travel) causes the aircraft to move to the left or right There is a case where the vehicle turns suddenly in the direction, and there is a problem that the aircraft travels in a direction not intended by the operator.

  In addition, when forgetting to release (disconnect) the brake pedal 130 when working in the field, when the riding seedling transplanter 1 turns at the field end, the left and right brake pedals 130, When stepping on 130, the traveling stops, the turning operation intended by the operator cannot be performed, the field edge is roughened, and the end position of the turning is away from the position intended by the operator. is there.

  However, according to this configuration, since the switching device 140 for the left and right brake pedals 130 and 130 is configured by the electromagnet 142, the connection of the left and right brake pedals 130 and 130 by the electrical signal from the control device 100 to the electromagnet 142. Since the connection between the left and right brake pedals 130 and 130 can be automated, the work efficiency can be improved.

Therefore, it is possible to easily switch between connection and disconnection of the left and right brake pedals 130 and 130 without imposing a burden on the operator, and an operation according to the work conditions can be performed.
Examples of work vehicles include tractors (cultivators), management machines (controlling machines, chemical spreaders), rice transplanters, and the like. Switching between connection and disconnection of the left and right brake pedals 130 and 130 suitable for work travel and road travel can be performed automatically and easily.

  In the vicinity of the cockpit 31, an auxiliary transmission lever 16 (FIG. 1) is provided. The auxiliary transmission lever 16 is rotated along a lever guide (not shown), so that the auxiliary transmission device can operate as “road speed on the road”. ”,“ High speed ”,“ Neutral ”, and“ Low speed ”. The speed decreases in the order of road running speed, high speed, and low speed. The operation position of the auxiliary transmission lever 12 can be detected by an auxiliary transmission lever sensor (such as a potentiometer that detects the operation angle of the lever) 165 provided on the base side of the auxiliary transmission lever 16.

  For example, when the operation position detected by the auxiliary transmission lever sensor 165 is a high-speed road traveling speed, the auxiliary transmission lever switching function for operating the switching device 140 to connect the left and right brake pedals 130 and 130 is controlled. It may be provided in the device 100.

In FIG. 8, an example of the flow by the control apparatus 100 of the riding type seedling transplanter 1 of FIG. 1 is shown.
When the operating position of the auxiliary transmission lever 16 is operated to the road traveling speed, the left and right brake pedals 130 and 130 are connected, so that the left and right brake pedals can be used when the riding seedling transplanter 1 travels straight ahead at high speed. Since the left and right side brakes J and J and the left and right side clutches I and I are operated by stepping on either of 130 and 130, the aircraft is prevented from turning sharply in the right or left direction, and the operation of stopping the aircraft is prevented. Easy to do.

  Further, when the operation position of the auxiliary transmission lever 16 is not the road traveling speed, that is, the working traveling speed in which the seedlings are planted in the field, the fine adjustment of the straight traveling operation or the turning operation at the field end is performed. Since the left and right brake pedals 130 and 130 are frequently used independently for fine adjustment, the switching device 140 is operated to bring the left and right brake pedals 130 and 130 into a disconnected state. When turning at the end of the field, the turning distance and turning locus can be changed by stepping on the left or right brake pedal 130 and operating the left or right side brake J or side clutch I. Therefore, since operation according to work conditions, such as a field shape and soil quality, can be performed, it is easy to adjust the work start position after turning to an adjacent strip, and work accuracy improves.

  It should be noted that the left and right brake pedals 130 and 130 are connected when the operation position of the auxiliary transmission lever 16 is high speed and the traveling speed on the road, and the left and right brake pedals 130 and 130 are connected when the operation position of the auxiliary transmission lever 16 is low. It may be in an unconnected state. Some workers may operate at a high work traveling speed instead of the road traveling speed even when traveling on the road. In addition, if the reference and boundary of the operation position in which the left and right brake pedals 130 and 130 are connected (or not connected) can be selected in this way, the range of operations preferred by the operator is widened, so that the operability is improved.

  Further, an approach sensor 133 (brake pedal position detecting means) for detecting the distance between the left and right brake pedals 130, 130 is provided below the left and right brake pedals 130, 130, and the distance detected by the approach sensor 133 is less than a predetermined value. In other words, that is, when the left and right brake pedals 130 and 130 are in the same position (when they are adjacent to each other), the control sensor 100 detects the proximity sensor 133 and connects the left and right brake pedals 130 and 130. May be provided.

When the proximity sensor 133 detects that the left and right brake pedals 130 and 130 are adjacent to each other, the control device 100 operates the switching device 140 to bring the left and right brake pedals 130 and 130 into a connected state.
With this configuration, it is possible to prevent the left and right brake pedals 130 and 130 from being connected in a state where one of the left and right brake pedals 130 is operated, so that an unintended turning operation is not started by the operator. , Operability is improved.

  When leaving the field after finishing rice planting, it is not normal to change the operation speed from the work speed to the road speed without stopping. When switching and starting, either the left or right brake pedal 130 applies the side brake J to prevent the aircraft from turning left or right.

  Since the proximity sensor 133 detects even a slight deviation, the fact that the proximity sensor 133 does not detect the adjoining of the left and right brake pedals 130 and 130 means that the positions of the left and right brake pedals 130 and 130 are slightly deviated. The pedals 130 and 130 are not connected, and the side brake J can work. Therefore, the left and right brake pedals 130 and 130 are connected only at a position where the effects of the left and right side brakes are exactly the same. When the proximity sensor 133 does not detect the adjoining left and right brake pedals 130 and 130, the operator needs to lightly step on the left and right brake pedals 130 and 130 to align the left and right positions after stopping traveling.

  Further, when the left and right brake pedals 130 and 130 are adjacent to each other, the left and right side clutches I and I and the side brakes J and J can be operated regardless of which of the left and right brake pedals 130 and 130 is depressed. Can be easily and reliably performed.

  When the distance detected by the proximity sensor 133 exceeds a predetermined value, the left and right brake pedals 130 and 130 are in a disconnected state, but the disconnected state exceeds a predetermined time (for example, 20 seconds). When it continues, the control apparatus 100 may be provided with a notification function in which a notification means capable of notification by hearing or vision is activated.

  It should be noted that it is unlikely that either the left or right brake pedal 130 will continue to work during the work beyond the predetermined time, and this may be the case when the operator connects the left and right brake pedals 130 and 130 to each other. The brake pedal 130 is depressed (actually, it is slightly shifted and slightly shifted to the left or right), or the brake pedals 130 and 130 are out of order. is there. A warning buzzer 145 is provided to notify that this is an abnormal state.

  The notification means may be a sound such as a warning buzzer 145 or may be displayed on the monitor 147 or the like. These may be used in combination. For example, FIG. 7 shows a warning buzzer 145 mark and a display example of the monitor 147 (squares indicate left and right brake pedals, and X indicates a state where they are not connected).

  When the distance between the left and right brake pedals 130, 130 detected by the approach sensor 133 exceeds a predetermined value, and the state continues for a predetermined time, notification means such as a warning buzzer 145 is activated. By doing so, it is possible to surely make the operator aware that either one of the left and right brake pedals 130, 130 has been operated. Accordingly, it is possible to prevent the left and right brake pedals 130 and 130 from being forgotten to be connected before the riding seedling transplanter 1 travels on the road.

  Then, by operating the notification means such as the warning buzzer 145 until the distance detected by the proximity sensor 133 is equal to or less than a predetermined value, the left and right brake pedals 130 and 130 are poorly adjusted, or the operator When the brake pedal 130 is continuously depressed, the automatic connection state can be prevented.

In FIG. 9, an example of the flow by the control apparatus 100 of the riding type seedling transplanter 1 of FIG. 1 is shown.
When the distance between the left and right brake pedals 130, 130 detected by the approach sensor 133 is not less than or equal to a predetermined value, the connected state of the left and right brake pedals 130, 130 becomes invalid (non-connected state), and the state is not longer than a predetermined time. When it continues exceeding, the warning buzzer 145 act | operates by the control apparatus 100. FIG. When the distance between the left and right brake pedals 130, 130 detected by the proximity sensor 133 becomes equal to or less than a predetermined value, the warning buzzer 145 stops sounding.

  With this configuration, since the operator can immediately determine that the left and right brake pedals 130 and 130 are not adjacent to each other, the left and right brake pedals 130 and 130 are forgotten to be connected before the riding seedling transplanter 1 travels on the road. There is nothing. Therefore, workability and safety are improved.

  In addition, the body frame 2 is provided with a pitching sensor 151 (front / rear inclination detecting means) for detecting an inclination angle in the front-rear direction with respect to the horizontal surface of the field (horizontal level), and the inclination angle detected by the pitching sensor 151 is equal to or greater than a predetermined angle. Then, the control device 100 may be provided with a forward / backward tilt switching function for operating the switching device 140 to connect the left and right brake pedals 130, 130.

  When the pitching sensor 151 detects an inclination in the front-rear direction that is equal to or greater than a predetermined angle of the machine body, the control device 100 causes the left and right brake pedals 130 and 130 to be in a connected state, so that the riding seedling transplanter 1 opens the entrance of the field. The left and right brake pedals 130 and 130 can be securely connected when moving or loading on a transport vehicle. Therefore, erroneous operation of the left and right brake pedals 130, 130 in a state where they are tilted back and forth is prevented, and work efficiency is improved.

  If only one of the left and right brake pedals 130, 130 is operated on a slope, the straight running posture is disturbed, and it takes more time to climb the slope. In particular, when going out of the field, it is often moved with reference to the saddle of the place that passed when entering the farm, but if either one of the left and right brake pedals 130, 130 is effective, it will move away from this fence. It ’s harder to climb.

In FIG. 10, an example of the flow by the control apparatus 100 of the riding type seedling transplanter 1 of FIG. 1 is shown.
For example, when the body frame 2 senses an inclination of 5 degrees (± 5 degrees) or more by the pitching sensor 151, the left and right brake pedals 130 and 130 are automatically connected by the control device 100.

  When the riding seedling transplanter 1 is loaded into the transport vehicle or lowered, the left and right brake pedals 130 and 130 are securely connected to improve safety. Further, when the front-rear direction inclination angle of the vehicle body frame 2 detected by the pitching sensor 151 is less than a predetermined angle, the left and right brake pedals 130 and 130 are not connected. The aircraft can be controlled at an angle that does not tilt. Therefore, an operation suitable for a farm field or a road condition is possible.

  Further, a rear wheel input shaft 103 for transmitting a driving force to the rear wheel gear cases 18, 18 by means of a rear wheel rotational speed sensor 153 (rear wheel rotational speed detecting means) for detecting the rotational speed (rpm) of the rear wheels 11, 11. 103, which is provided on the front side 103a (FIGS. 1 and 2) of the vehicle 103, calculates a traveling speed from the rotational speed of a predetermined time detected by the rear wheel rotational speed sensor 153, and switches when the calculated traveling speed exceeds a predetermined speed. The control device 100 may be provided with a traveling speed switching function for operating the device 140 to connect the left and right brake pedals 130, 130.

In FIG. 11, an example of the flow by the control apparatus 100 of the riding type seedling transplanter 1 of FIG. 1 is shown.
For example, when the traveling speed of the riding seedling transplanter 1 is 8.6 km / h or more, the left and right brake pedals 130 are connected. In this case, if the rear wheel rotational speed sensor 153 detects that the traveling speed of the riding seedling transplanter 1 is 10 km / h, the speed is 8.6 km / h or more. The left and right brake pedals 130 are connected.

When the traveling speed of the riding seedling transplanter 1 is equal to or higher than a certain level, it may be a speed that cannot be traveled in the field. Therefore, the control device 100 recognizes that the traveling is on the road, and the left and right brake pedals 130, 130. Are connected.
With this configuration, the left and right brake pedals 130 and 130 can be reliably interlocked while the riding seedling transplanting machine 1 is traveling at high speed, so that a turning operation unintended by the operator is not started, and the riding seedling transplanting machine is performed. The operability of 1 is improved.

  In addition, a switching device switch 155 may be provided in various switches in the vicinity of the driver's seat 11 and the switching device 140 may be operated by this switch operation.

  The switching device switch 155 is a switch that can be operated by an operator when working in a wetland. When the switching device switch 155 is pressed, the electromagnet 142 is not energized and the magnetic force is lost. When the switching device switch 155 is turned off, the electromagnet 142 is energized and magnetized. In the case of a wet field, mud clings to the wheels, so steering by the handle 34 is likely to be hindered, making it difficult to perform a straight-ahead operation. Therefore, it is necessary to finely adjust the left and right brake pedals 130, 130 by disconnecting them and turning the side brakes J on and off.

On the other hand, in a soil field that is difficult to muddy, the steering by the handle 34 is accepted almost as it is, so that the left and right brake pedals 130 and 130 are connected and when turning, the vehicle may turn to the left or right by mistake. To prevent.
Whether or not the field is a wet field is determined by an operator, not by a sensor or the like provided on the machine body. Since the worker usually knows the nature of the field he has, he can leave the operation.

  According to this configuration, the left and right brake pedals 130 and 130 can be switched between connection and non-connection by a switch operation, so that the operator does not need to perform switching manually and the burden on the operator is reduced.

Further, a turning angle sensor 157 (steering angle detecting means) for detecting the steering angle of the handle 34 for steering the front wheels 10 and 10 is provided, and the steering angle detected by the turning angle sensor 157 is a predetermined angle ( If it is less than 90 to 150 degrees, for example, it is determined that the riding seedling transplanter 1 is in a straight traveling state (non-turning state), and the switching device 140 is operated to bring the left and right brake pedals 130 and 130 into a connected state. At the same time, when the steering angle detected by the cutting angle sensor 157 is equal to or greater than a predetermined angle, it is determined that the riding seedling transplanter 1 is in a turning state, and the switching device 140 is operated to disconnect the left and right brake pedals. The control device 100 may be provided with a steering angle switching function for setting the state.
The cutting angle sensor 157 detects an angle from the center line of the handle 34 and may be a potentiometer or the like.

In FIG. 12, an example of the flow by the control apparatus 100 of the riding type seedling transplanter 1 of FIG. 1 is shown.
If the steering angle of the handle 34 is less than a predetermined angle (straight-running state), the left and right brake pedals 130 and 130 are connected, while if the steering angle by the handle 34 is equal to or greater than the predetermined angle (turning state), Since the brake pedals 130 and 130 are in a non-connected state, when the riding seedling transplanting machine 1 performs a work while going straight ahead, even if the left and right brake pedals 130 are stepped on, an unintended turning operation by the operator is prevented. As a result, the trajectory of the airframe is substantially linear, and the work accuracy is improved.

  Further, since the operator operates the left and right brake pedals 130 and 130 while the riding seedling transplanting machine 1 is turning, in this case, the control device 100 receives the operation of the left and right brake pedals 130 and 130 independently. It is good to have such a configuration. By doing in this way, the turning distance and turning locus | trajectory at the time of the riding type seedling transplanter 1 turning at the field end can be changed by operation of the left and right brake pedals 130 and 130 by the operator. Therefore, it is possible to perform operations in accordance with work conditions such as the shape of the field and soil quality, and it is easy to adjust the work start position after turning to the adjacent strip, and work accuracy is improved.

  In addition, an elevating link sensor 160 (height detecting means) for detecting the height of the seedling planting unit 4 is provided between the upper link 40 and the link base frame 42 of the elevating link device 3. It is detected that the height of the appendage 4 is equal to or higher than a predetermined height (for example, 30 to 50 cm, depending on the field and model), and the state continues for a predetermined time (for example, 60 seconds). Or when the height of the seedling planting unit 4 is detected to be equal to or higher than the predetermined height by the lift link sensor 160 and the traveling distance of the riding seedling transplanter 1 is detected to be equal to or longer than the predetermined distance. May determine that the seedling planting unit 4 is in a non-working state and operate the switching device 140 to provide a working unit switching function for connecting the left and right brake pedals 130 and 130 to the control device 100.

In the above case, 60 seconds are allowed, and the connection state is established at 61 seconds. However, the setting of the control device 100 may be changed and the determination may be made in units of 0.1 seconds.
Moreover, the height of the seedling planting part 4 is the height from the lowest position when performing work, and in the case of the seedling planting part 4, the state lowered to the planting position is set as a reference (zero).

In FIG. 13, an example of the flow by the control apparatus 100 of the riding type seedling transplanter 1 of FIG. 1 is shown.
The travel distance of the riding seedling transplanter 1 is calculated from the rotational speed detected by the rear wheel rotational speed sensor 153. Therefore, the rear wheel speed sensor 153 also functions as a travel distance detecting means.

The riding seedling transplanter 1 has traveled a predetermined distance when a predetermined time has passed with the seedling planting part 4 raised to a predetermined height or higher, or with the seedling planting part 4 raised to a predetermined height or higher. In this case, the control device 100 determines that the control device 100 is in a non-working state (a state in which planting is not performed) and switches the left and right brake pedals 130 and 130 to the connected state. Since the left and right brake pedals 130 and 130 can be reliably interlocked when the seedling transplanter 1 travels, a turning operation unintended by the operator is not started in the non-working state of the riding seedling transplanter 1, The operability of the riding seedling transplanter 1 is improved.
For example, in the case of a work vehicle provided with a working unit such as a lawn mower, a snowplow, a cleaning machine, a tiller, a control machine, a chemical spreader, etc. But the same is true.

  Further, if both ends 142a, 142a of the adhesion surface of the electromagnet 142 of the switching device 140 are tapered, the left or right brake pedal arm, to which the adhesion surface of the electromagnet 142 is an adhesion partner when the left and right brake pedals 130, 130 are connected. It is possible to prevent the 132 from being damaged. If there are corners at both ends 142a, 142a of the bonding surface of the electromagnet 142 of the switching device 140, the brake pedal arm 132 may be damaged at the corners when the left and right brake pedals 130, 130 are connected. No problem arises.

  A gap W <b> 1 (FIG. 6) is provided between the head of the pin 135 and the left brake arm 132 so that the electromagnet 142 can move toward the right brake pedal arm 132, which is the bonding partner. Further, a gap W <b> 2 is provided between the electromagnet 142 and the right brake arm 132 to prevent the electromagnet 142 from strikingly hitting the left side surface of the right brake arm 132.

  When the electromagnet 142 moves to the right brake arm 132 side by energization of the control device 100 and the head of the pin 135 hits the left brake pedal arm 132, the movement of the electromagnet 142 stops. If the gap W1 is smaller than the gap W2, that is, if the gap between the electromagnet 142 and the right brake pedal arm 132 is large, the electromagnet 142 cannot be bonded to the left side surface of the right brake pedal arm 132.

  However, by making the gap W1 larger or the same as the gap W2 (W1 ≧ W2), the electromagnet 142 is securely bonded to the right brake pedal arm 132. Therefore, the left and right brake pedals 130 and 130 can be reliably connected. On the other hand, even if the adhesive surface of the electromagnet 142 and the brake pedal arm 132 are in contact with each other by tapering both ends of the adhesive surface of the electromagnet 142, as shown in the state diagram during one-brake operation in FIG. Since the electromagnet 142 moves in the direction of the arrow D, the electromagnet 142 and the brake pedal arm 132 are prevented from being engaged with each other, and it is possible to smoothly depress the left and right brake pedals 130.

  When the electromagnet 142 is not formed with a tapered portion, even if the electromagnet 142 is configured to move in the D direction, the corner portions of the square electromagnet 142 and the brake pedal arm 132 are engaged with each other, and are difficult to move in the arrow D direction. There is a possibility. However, by forming the taper portion, even if the electromagnet 142 and the brake pedal arm 132 come into contact with each other, it becomes difficult to engage with each other. Therefore, the electromagnet 142 is easily retracted in the direction of arrow D, and the one side brake J on the side to be operated is effective. It becomes easy. Further, when the brake pedal arm 132 is formed into a pipe shape without corners, the effect is further enhanced.

Further, when both ends 132a and 132a of the adhesive surface of the brake pedal arm 132 to which the electromagnet 142 is bonded are tapered (FIG. 6C), the same as when both ends 142a and 142a of the adhesive surface of the electromagnet 142 are tapered. In addition, even when the adhesive surface of the electromagnet 142 and the brake pedal arm 132 are in contact with each other, it is possible to smoothly step on the left or right brake pedal 130.
Further, both ends 142a and 142a of the adhesive surface of the electromagnet 142 and both ends 132a and 132a of the adhesive surface of the brake pedal arm 132 may be tapered.

On the other hand, the riding seedling transplanter 1 may be configured such that the cockpit 31 can move (slide) in the front-rear direction. FIG. 14A shows a side view of the cockpit 31 and FIG. 14B shows a cross-sectional view taken along line S1-S1.
For example, the pilot seat 31 can be slid in the front-rear direction by changing the attachment position of the attachment piece 31 a in the lower front part of the cockpit 31 and the support piece 161 standing on the engine cover 30. Attachment of the attachment piece 31a to the support piece 161 can be easily performed with a fixture (bolt, nut, etc.).

  FIG. 14 shows a case of sliding in three stages. When the position of the cockpit 31 is behind the standard time (center), it is configured to tilt backward (reclining). For example, the reclining can be easily performed by devising the shape of the engine cover 30 below the cockpit 31.

  As shown in FIG. 14, the side surface of the engine cover 30 is stepped, and a recess 30 a is provided in the step portion. When the cockpit 31 is slid rearward, the leg portion 31b behind the cockpit 31 is fitted into the recess 30a, so that the cockpit 31 becomes a reclining seat by tilting backward.

Thus, reclining can be easily performed by devising the shape of the engine cover 30 without providing a special mechanism.
For example, when a large operator lowers the cockpit 31 backward, the cockpit 31 is reclined backward relative to the standard time, and a space is generated between the cockpit 31 and the handle 34. Therefore, the worker's habitability is ensured and the operation can be performed comfortably.

FIG. 15 shows a side view of another example of the cockpit 31. FIG. 15A shows the state of the normal cockpit 31, FIG. 15B shows the state of the cockpit 31 during refueling, and the round frame portion Z in FIG. The figure of the attachment plate 163 seen from S2 direction is shown.
A fuel tank 24 is provided below the engine cover 30 below the cockpit 31.

  A mounting plate 163 having an L-shaped cross section may be provided in the lower part of the cockpit 31, and an insertion port for the fuel supply hose 167 to the fuel tank 24 may be provided in front of the mounting plate 163.

  The mounting plate 163 has one L-shaped surface (the larger surface in the illustrated example) attached to the lower portion of the cockpit 31 by a fixture 159 such as a bolt or a nut, and the other L-shaped surface (illustrated example). The smaller surface is the leg of the cockpit 31. A support column 168 erected on the engine cover 30 abuts against the larger L-shaped surface from below to support the cockpit 31.

  An opening 163a through which the fuel supply hose 167 of the fuel tank 24 can pass is provided on the smaller L-shaped surface as indicated by the round frame portion Z. Then, when refueling the fuel tank 24, the refueling hose 167 is inserted into the opening 163 a of the mounting plate 163. A mounting piece 31a at the lower front portion of the cockpit 31 is rotatably connected to the support piece 161. By tilting the cockpit 31 forward with this connecting portion as a fulcrum, the mounting plate 163 is separated from the engine cover 30, The oiling hose 167 can be inserted into the opening 163 a of the mounting plate 163.

  Since the oil supply hose 167 is fixed by the mounting plate 163, the oil supply hose 167 is stabilized, so that the operator can supply oil without supporting the oil supply hose 167 during oil supply. Usually, during refueling, an operator often supports the refueling hose 167 with one hand and holds a refueling tank (not shown) with the other hand. However, according to this configuration, since the operator can hold the fuel tank with both hands and supply fuel to the fuel tank 24, the fuel can be supplied in a stable state. Therefore, workability and safety are improved.

Further, FIG. 16 shows a side view (FIG. 16A) and a rear view (FIG. 16B) of another example of the cockpit.
The mounting plate 163 has an I-shaped cross section, and a column 168 erected on the engine cover 30 abuts from below to support the cockpit 31.
By tilting the cockpit 31 forward, the mounting plate 163 can be removed and replaced to change the position of the drink holder 169 on the left and right so that it can be used by both right-handed and left-handed people.

Further, FIG. 17 shows a side view (FIG. 17A) and a rear view (FIG. 17B) of another example of the cockpit.
The mounting plate 163 is also of an I-shaped cross section, and a support column standing on the engine cover 30 abuts from below to support the cockpit 31.
A leg portion 170 fixed to the mounting plate 163 side is in contact with a support portion 172 fixed to the engine cover 30 side. The leg portion 170 of the cockpit 31 is made of an elastic body (such as rubber), and absorbs an impact when the cockpit 31 is returned to the working position. The support portion 172 is made of resin (integrated molding) like the engine cover 30, but if a concave portion (not shown) having the same shape as the lower portion of the leg portion 170 is formed on the contact surface (upper surface). The leg portion 170 and the support portion 172 are less likely to shake back and forth and left and right, and the cockpit 31 is less likely to shake.

  The present invention is not limited to a riding-type seedling transplanter equipped with a seedling planting unit, and can be used for other work vehicles.

DESCRIPTION OF SYMBOLS 1 Riding type seedling transplanter with fertilizer 2 Body frame 3 Elevating link device 4 Seedling planting part 5 Fertilizer 10 Front wheel 11 Rear wheel 11a Rear wheel drive shaft 12 Mission case 13 Front wheel final case 15 Main frame 16 Sub shift lever 18 Rear Wheel gear case 18a Transmission shaft 20 Engine 23 Hydrostatic continuously variable transmission (HST)
24 Fuel tank 26 Planting transmission shaft 27 (27a, 27b) Leveling rotor 30 Engine cover 31 Pilot seat 32 Front cover 34 Handle 35 Floor step 36 Rear step 37 Rotor cover 38 Spare seedling stand 40 Upper link 41 Lower link 42 Link base Frame 43 Vertical link 44 Connecting shaft 46 Elevating hydraulic cylinder 50 Transmission case 51 Seedling stage 51a Seedling outlet 52 Seedling planting device 53 Blower electric motor 54 Seedling feed belt 55 Center float 56 Side float 58 Blower 59 Air chamber 60 Fertilizer Hopper 61 Feeding portion 62 Fertilizer hose 64 Groove body 76 Side clutch shaft 100 Control device (controller) 103 Rear wheel input shaft 105 Rear axle 107 Front axle 109 Rear output shaft 111 Friction plate 113 Plate spring 114 Fixed plate 115, 117 Shim 116 Clutch / brake case 118 Disc 120 Brake arm 122 Brake arm shaft 130 Brake pedal 132 Brake pedal arm 133 Proximity sensor 135 Pin 140 Switching device 142 Electromagnet 145 Warning buzzer 147 Monitor 151 Pitching sensor 153 Rear wheel rotation speed Sensor 155 Wet pad switch 157 Cutting angle sensor 159 Fixing tool 160 Lifting link sensor 163 Mounting plate 165 Sub-shift lever sensor 167 Refueling hose 168 Strut 169 Drink holder 170 Leg 172 Supporting part I Side clutch J Side brake

Claims (8)

An engine (20), a pair of left and right traveling devices (10, 11) that travels on a field with the driving force of the engine (20), a vehicle body (2) including the traveling device (10, 11), and the vehicle body (2) A rear working part (4) provided so as to be movable up and down, and a left and right side clutch (I,) that engages and disengages transmission from the engine (20) to the traveling vehicle body (2). I), left and right side brakes (J, J) of the traveling vehicle body (2), left and right brakes capable of operating the left and right side clutches (I, I) and the left and right side brakes (J, J) A shift lever (16) capable of operating the pedals (130, 130), the speed of the traveling devices (10, 11) to a plurality of shift positions on the high speed side and the low speed side, and an operation position of the shift lever (16). Shift lever detection means for detecting (165) The traveling vehicle provided with,
A switching device (140) for switching between a connected state in which the left and right brake pedals (130, 130) are connected to each other and a non-connected state in which the left and right brake pedals are connected to each other;
Control having a shift lever switching function for operating the switching device (140) to connect the left and right brake pedals (130, 130) when the position detected by the shift lever detection means (165) is on the high speed side. A traveling vehicle comprising the device (100). Brake pedal position detection means (133) for detecting the distance between the left and right brake pedals (130, 130) is provided on the left and right brake pedals (130, 130),
When the distance detected by the brake pedal position detecting means (133) is equal to or less than a predetermined value, the control device (100) operates the switching device (140) to operate the left and right brake pedals (130, 130). The work vehicle according to claim 1, further comprising a brake pedal switching function for bringing the vehicle into a connected state. An informing means (145, 147) capable of informing through hearing or sight is provided,
The control device (100) detects the brake pedal position when the distance detected by the brake pedal position detecting means (133) exceeds a predetermined value and the state continues for a predetermined time. The work vehicle according to claim 2, further comprising a notification function for operating the notification means (145, 147) until the distance detected by the means (133) becomes a predetermined value or less. The vehicle body (2) is provided with a front / rear inclination detection means (151) for detecting a front / rear inclination angle of the vehicle body (2) with respect to the horizontal plane of the field,
The control device (100) operates the switching device (140) to turn the left and right brake pedals (130, 130) when the tilt angle detected by the front / rear tilt detection means (151) is equal to or greater than a predetermined angle. The work vehicle according to claim 1, wherein the work vehicle has a forward / backward inclination switching function to be in a connected state. The travel device (10, 11) includes a pair of left and right front wheels (10, 10) and a pair of left and right rear wheels (11, 11).
A rear wheel rotational speed detection means (153) for detecting the rotational speed of the pair of left and right rear wheels (11, 11) is provided;
The control device (100) calculates a traveling speed from the rotational speed of a predetermined time detected by the rear wheel rotational speed detecting means (153), and when the calculated traveling speed becomes equal to or higher than the predetermined speed, the switching device (100) The work vehicle according to any one of claims 1 to 4, further comprising a traveling speed switching function that activates 140) to connect the left and right brake pedals (130, 130). Steering means (34) of the travel device (10, 11) is provided on the vehicle body (2),
A steering angle detecting means (157) for detecting a steering angle by the steering means (34) is provided;
When the steering angle detected by the steering angle detection means (157) is less than a predetermined angle, the control device (100) determines that the work vehicle is in a straight traveling state and operates the switching device (140). When the left and right brake pedals (130, 130) are connected to each other and the steering angle detected by the steering angle detection means (157) is equal to or larger than a predetermined angle, the work vehicle is in a turning state. 6. A steering angle switching function for determining and operating the switching device (140) to disengage the left and right brake pedals (130, 130). The work vehicle according to the item. A height detecting means (160) for detecting the height from the lowest position in the working state of the working section (4);
The travel device (10, 11) is provided with travel distance detection means (153) for detecting a travel distance,
When the height detecting means (160) detects that the height of the working part (4) is equal to or higher than a predetermined height and the state continues for a predetermined time or more, or the height detection If the means (160) detects that the height of the working part (4) is greater than or equal to a predetermined height, and the travel distance detection means (153) detects that the travel distance is greater than or equal to a predetermined distance ,
The control device (100) determines that the working unit (4) is in a non-working state and operates the switching device (140) to bring the left and right brake pedals (130, 130) into a connected state. The work vehicle according to claim 1, further comprising a part switching function. The switching device (140) is constituted by an electromagnet (142) provided on the left and right brake pedals (130, 130),
The controller (100) energizes the electromagnet (142) to place the left and right brake pedals (130, 130) in a connected state, while stopping energization of the electromagnet (142). The work vehicle according to any one of claims 1 to 7, further comprising an electromagnet switching function for disengaging the brake pedals (130, 130).

Images