JP2013039091A - Paddy working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paddy working machine having a mechanism for holding an operation lever at a predetermined angle.SOLUTION: An operation rod 37 transmits an operation of the operation lever 35 for traveling arranged at a lower side of a steering wheel 45 as a rotation. The operation rod 37 is extended to the lower part of a handle post 32 along from the operation lever 35 to the handle post 32 and the lower part of the operation rod 37 and a part 69 to be operated for traveling are connected by a linking mechanism 55 so that the operation lever 35 can operate the part 69 to be operated. A holding mechanism 68 capable of holding the operation lever 35 at the predetermined angle is arranged at the lower part of the operation rod 37 by holding the operation rod 37.

Description

  The present invention relates to a paddy field work machine such as a riding type rice transplanter or a riding type direct seeder.

  In the riding type rice transplanter as an example of a paddy field work machine, as disclosed in Patent Document 1, a steering handle for steering a front wheel is rotatably provided on a handle post, and a shift lever and an accelerator lever are provided on the steering handle. There is one provided on the lower side of the steering handle so that it can be operated around an axis parallel to the rotation axis. Thus, the shift lever and the accelerator lever are provided in the vicinity of the steering handle, and the operability of the shift lever and the accelerator lever is improved.

JP 2007-276777 A (see FIGS. 1, 2, and 6)

As described in Patent Document 1, when an operation lever such as a shift lever or an accelerator lever is provided, a mechanism for holding the operation lever at a predetermined angle so that the position of the operation lever does not change due to vibration or the like during traveling. I need it.
An object of the present invention is to appropriately provide a mechanism for holding an operation lever at a predetermined angle in a paddy field work machine.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a paddy field work machine.
A handle post that rotatably supports a steering handle that steers the front wheel is provided, and a traveling post provided on the lower side of the steering handle so as to be operable around an axis parallel to the rotation axis of the steering handle. With an operating lever,
An operation rod that transmits the operation of the operation lever as a rotation extends from the operation lever along the handle post to the lower portion of the handle post, and the lower portion of the operation rod and the operated portion for traveling are linked by a linkage mechanism. Connected and configured to operate the operated part by the operation lever,
A holding mechanism capable of holding the operation lever at a predetermined angle by holding the operation rod is provided at a lower portion of the operation rod.

(Function and effect)
According to the first feature of the present invention, the operation of the operation lever is transmitted from the operation lever to the lower part of the operation rod as the rotation of the operation rod, the direction is changed from the lower part of the operation rod and transmitted to the operated part by the linkage mechanism, The operated portion is operated, and the operation lever connected to the operation rod can be held at a predetermined angle by holding the operation rod by the holding mechanism.

  According to the first feature of the present invention, since the operating rod extends from the operating lever along the handle post to the lower portion of the handle post, the holding mechanism provided at the lower portion of the operating rod is also provided at the lower portion of the handle post. Yes, it is possible to arrange the holding mechanism at the lower part of the handle post, which has a relatively large space, without applying structural force, and the operation reliability of the holding mechanism can be improved. It was.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the paddy field working machine of the first feature of the present invention.
The linkage mechanism is connected to an operation arm provided at a lower portion of the operation rod, and the linkage mechanism is pushed and pulled by the swing of the operation arm due to the rotation of the operation rod, so that the operated portion is operated. Configured to be
The holding mechanism is configured such that the operating lever can be held at a predetermined angle by applying a frictional force by a spring to the operating arm.

(Function and effect)
According to the second feature of the present invention, when the operating rod is rotated by the operation of the operating lever, the operating arm below the operating rod is in a state of swinging around the operating rod and is in a state of drawing an arc locus.
As a result, when a friction force is applied to the operating arm of the operating rod by the spring in the holding mechanism, the operating arm of the operating rod is stabilized by applying the spring force along the arc locus of the operating rod of the operating rod. Since the operation lever can be stably held at a predetermined angle, the state in which the position of the operation lever and the operated portion changes due to vibration during traveling is reduced. I was able to.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the paddy field working machine of the second feature of the present invention.
The linkage mechanism is constituted by a wire, and the operated part is an accelerator operating part on an upper part of an engine provided behind the handle post.
The wire extends rearward from the operation arm and is connected to the accelerator operation section from the lower side of the engine through the rear side of the engine.

(Function and effect)
When the engine is provided behind the handle post and the accelerator operating part as the operated part for traveling is provided at the upper part of the engine, according to the third feature of the present invention, from the lower part of the handle post (the operating arm of the operating rod) A wire as a linkage mechanism extends rearward, extends upward while drawing a relatively large arc on the lower side and rear side of the engine, and is connected to the accelerator operation unit of the engine.

  As a result, the wire does not interfere with each part of the upper part of the engine by passing through the lower side of the engine, and it can be connected to the accelerator operation part of the engine without difficulty, without bending the wire with a particularly small radius. The operation lever can be used to operate the wire without any trouble, and the operation lever can be used to operate the accelerator operation part of the engine without any trouble, thereby improving the stability and certainty of the operation of the accelerator operation part of the engine by the operation lever. I was able to.

It is the whole left side view of a riding type rice transplanter. It is a whole top view of a riding type rice transplanter. FIG. 3 is an overall plan view of the vicinity of an engine, a transmission case, a front wheel support case, and a rear wheel support case. It is a top view which shows arrangement | positioning of the wire from a holding mechanism and an operation arm to an accelerator operation part. It is a right view which shows arrangement | positioning of the wire from a holding mechanism and an operation arm to an accelerator operation part. It is a right side view of the vicinity of the holding mechanism and the operation arm. It is a top view of the vicinity of a holding mechanism and an operation arm. It is a front view of the vicinity of a driver's seat and a lift lever. It is a front view of the driver's seat of 3rd another form of implementation of invention.

[1]
As shown in FIGS. 1 and 2, the aircraft is supported by the right and left front wheels 1, the right and left rear wheels 2, the step 25 and the driver's seat 16 are supported by the aircraft, and the link mechanism 3 and A hydraulic cylinder 11 that drives the link mechanism 3 to move up and down is provided, and a three-row planting type seedling planting device 4 is supported by the link mechanism 3 to constitute a riding type rice transplanter that is an example of a paddy field work machine. Yes.

  As shown in FIGS. 1 and 2, the seedling planting device 4 includes a planting case 17 and a support case 18, and three crank-type planting arms that are rotatably supported by the planting case 17 and the support case 18. 19. A seedling bed 20 and a float 21 which are driven to reciprocate laterally to the left and right, and a float 21 are provided.

  As shown in FIGS. 1 and 2, when the seedling planting device 4 moves up and down with respect to the float 21 that follows the ground contact with the rice field, this operation is applied to a control valve (not shown) via a wire (not shown). Then, hydraulic oil is supplied to and discharged from the control valve to the hydraulic cylinder 11 so that the height from the surface (float 21) to the seedling planting device 4 is maintained at a set value by the hydraulic cylinder 11. The attaching device 4 automatically moves up and down, whereby the planting depth of the seedling by the planting arm 19 is maintained at the set depth (elevating control function).

  As shown in FIGS. 1 and 2, an elevating lever 9 is provided on the right side of the driver's seat 16, and the elevating lever 9 is configured to be freely operated in an ascending position, a neutral position, a descending position, and a planting position. Yes. When the elevating lever 9 is operated to the raised position, a planting clutch (not shown) that transmits power to the seedling planting device 4 is operated in a disconnected state, and the above-described elevating control function is stopped by the hydraulic cylinder 11. The seedling planting device 4 is raised.

  When the elevating lever 9 is operated to the neutral position, the planting clutch is operated in the disengaged state, and the raising / lowering of the seedling planting device 4 by the hydraulic cylinder 11 is stopped while the elevating control function is stopped. When the raising / lowering lever 9 is operated to the lowered position, the planting clutch is operated in the disengaged state, the raising / lowering control function is stopped, the seedling planting device 4 is lowered by the hydraulic cylinder 11, and the float 21 is brought into contact with the rice field. The aforementioned lifting control function is activated. When the elevating lever 9 is operated to the planting position, the planting clutch is operated to the transmission state in a state where the elevating control function is activated.

As shown in FIG. 8, an opening 16 c is formed on the right and left upper portions of the backrest portion 16 b of the driver seat 16, and the outer periphery of the opening 16 c is a handle portion 16 d, so that the driver can The handle portion 16d can be used to get on and off.
In the driver's seat 16, right and left concave portions 16 e are formed at the connection portion between the seat portion 16 a and the backrest portion 16 b, and the right concave portion 16 e is positioned at the height of the grip portion 9 a of the elevating lever 9. Thus, when the driver sitting on the driver's seat 16 holds the grip portion 9a of the lifting / lowering lever 9 and operates the lifting / lowering lever 9 as described above, the backrest portion 16b of the driver's seat 16 interferes with the right hand of the driver. I try not to be.

[2]
Next, the structure near the engine 22 will be described.
As shown in FIGS. 1, 3, and 5, the transmission case 5 and the rear wheel support case 6 are integrally configured and disposed at the rear part of the fuselage, and the transmission case 5 is inclined with respect to the rear wheel support case 6. It is located in the upper front. A front wheel support case 12 that supports the right and left front wheels 1 to be steerable left and right is provided, and a support frame 13 is connected across the front wheel support case 12 and the rear wheel support case 6 (mission case 5). Has been. The support frame 13 is formed in a round pipe shape and is positioned at the center of the left and right sides of the machine body. A transmission shaft 14 is disposed inside the support frame 13.

  As shown in FIGS. 3, 4, and 5, a horizontal frame 15 having a U-shaped cross section is fixed to the center portion of the support frame 13, and the right and left support frames 10 having an arch shape in the side view are The right and left side portions of the frame 15 and the right and left side portions of the rear wheel support case 6 are connected. A driver's seat 16 is supported on the front portions of the right and left support frames 10, and the fuel tank 8 is supported on the rear portions of the right and left support frames 10.

  As shown in FIGS. 3, 4, and 5, the engine 22 and the transmission case 5 are arranged below the driver's seat 16, and the crankcase 22 a of the engine 22 is supported on the middle portion of the horizontal frame 15 via the vibration isolation rubber 23. Has been. The engine 22 is tilted rearward so that the crankcase 22a of the engine 22 is located on the front side and the cylinder 22b of the engine 22 is located on the rear side. The mission case 5 is arranged to be inclined forward so that the mission case 5 is located below the rear of the engine 22 and the upper part of the mission case 5 is located on the front side and the lower part of the mission case 5 is located on the rear side. ing.

  As shown in FIGS. 3 and 4, a support plate 24 in the left-right direction of the fuselage is fixed to the upper part of the cylinder 22 b of the engine 22 and the upper part of the transmission case 5, and the right and left vibration-proof rubbers 26 a and 26 b are supported. Mounted between the plates 24, the cylinder 22b of the engine 22 is supported on the upper part of the transmission case 5 via right and left vibration-proof rubbers 26a, 26b.

[3]
Next, the transmission structure from the engine 22 to the mission case 5 will be described.
As shown in FIGS. 3 and 4, an anti-vibration rubber 23 is arranged on the right side in a plan view with respect to the support frame 13 and the crank case 22 a of the engine 22, and the left side of the crank case 22 a of the engine 22. A cam shaft 22c is provided for output at the portion. The input shaft 5a protrudes from the left lateral side of the transmission case 5, and a transmission belt 29 extends over a pulley 27 fixed to the cam shaft 22c of the engine 22 and a pulley 28 fixed to the input shaft 5a of the transmission case 5. Is wound. A support arm 30 is swingably supported by a crankcase 22a of the engine 22, a tension pulley 30a is supported by the support arm 30, and the support arm 30 is spring-loaded so that the tension pulley 30a is pressed against the transmission belt 29. (Not shown).

  With the above structure, as shown in FIGS. 3 and 4, the power of the engine 22 is transmitted to the transmission case 5 via the transmission belt 29, and a gear transmission (not shown) installed in the transmission case 5 It is transmitted to the right and left rear wheels 2 via a right side clutch 53 that can transmit and shut power to the rear wheel 2 and a left side clutch 53 that can transmit and shut power to the left rear wheel 2. Therefore, the power branched from the gear transmission of the transmission case 5 is transmitted from the transmission shaft 14 to the right and left front wheels 1 via the front wheel support case 12. The power transmitted to the mission case 5 is transmitted to the seedling planting device 4 via the planting clutch and the PTO shaft 31 (see FIG. 1) built in the mission case 5.

  As shown in FIGS. 3, 4, and 5, a support bracket 60 is fixed to a portion of the support frame 13 slightly rearward of the front wheel support case 12, and a pedal arm around the horizontal axis P <b> 1 in the left-right direction of the body of the support bracket 60. 61 is supported swingably up and down and extends forward, a pedal portion 61 a is fixed to the front portion of the pedal arm 61, and a handle portion 61 b is provided at the front end of the pedal arm 61. An operation arm 62 is fixed to the pedal arm 61, an operation rod 63 is connected across the support arm 30 and the operation arm 62, and a spring (not shown) for urging the pedal arm 61 upward is provided. ing. A brake 49 is built in the front axle case 12, and an operation rod 65 is connected across the operation arm 64 and the operation arm 62 of the brake 49.

  The state shown in FIGS. 2, 3 and 5 is a state where the pedal arm 61 is operated to the upper return position, and the support arm 30 and the tension pulley 30a are pressed against the transmission belt 29, and the power of the engine 22 is transmitted. The transmission is transmitted to the transmission case 5 via the belt 29, and the brake 49 is operated to the braking release side.

  As shown in FIGS. 2, 3, and 5, when the pedal arm 61 is operated to the lower step position, the operation rod 63 is pushed, the support arm 30 and the tension pulley 30 a are separated from the transmission belt 29, and the engine 22 is operated. Power to the transmission case 5 is cut off, and the right and left front wheels 1, the right and left rear wheels 2, and the seedling planting device 4 are stopped. At the same time, the operation rod 65 is pushed and braked. 49 is operated to the braking side. When the brake 49 is operated to the braking side, the right and left front wheels 1 are braked, and the right and left rear wheels 2 are braked via the transmission shaft 14. In this case, by engaging the holding lever 66 with the pedal arm 61 in a state where the pedal arm 61 is operated to the lower step position, the pedal arm 61 can be held in the state where the pedal arm 61 is operated to the lower step position.

[4]
Next, the steering structure of the right and left front wheels 1 will be described.
As shown in FIGS. 3, 5, and 6, a support frame 38 is fixed obliquely forward and upward at the front left and right center of the front wheel support case 12, and a support shaft 39 around an oblique longitudinal axis P <b> 2 of the support frame 38. Is supported rotatably, and a fan-shaped gear-shaped steering member 40 is coupled to the lower portion of the support shaft 39. The support frame 38 is integrally formed of cast iron, and the support frame 38 functions as a balance weight. A knuckle arm 33a extends rearward from the right and left front wheel support portions 33, and right and left tie rods 41 are connected across the steering member 40 and the knuckle arms 33a of the right and left front wheel support portions 33. ing.

  As shown in FIG. 3, the right (left) side clutch 53 is configured as a frictional multi-plate type so that power can be transmitted to and cut off from the right (left) rear wheel 2 and is transmitted by a spring. It is energized. A right and left operating arm 48 for operating the right and left side clutches 53 in a disengaged state is provided at the lower portion of the rear wheel support case 6 so as to be swingable. The operating rod 42 is connected. A pair of arc-shaped long holes 40 a centering on the vertical axis P <b> 2 is opened in the steering member 40, and the front end portions of the right and left operating rods 42 are inserted into the long holes 40 a of the steering member 40. Yes.

  As shown in FIGS. 5, 6, and 7, a round pipe-like handle post 32 and a semi-cylindrical rear cover 43 are provided, and a lower portion of the handle post 32 and the rear cover 43 is connected to a support plate 57 to support The plate 57 is bolted to the support frame 38. A support plate 34 also serving as a lever guide is connected across the upper part of the handle post 32 and the upper part of the rear cover 43, and a semicylindrical detachable front cover 47 is attached to the front part of the rear cover 43. . A steering operation shaft 44 is rotatably supported inside the support frame 38 and the handle post 32, and a steering handle 45 is connected to the steering operation shaft 44 at the upper end of the handle post 32, and formed at the lower end of the steering operation shaft 44. The pinion gear 44 a thus engaged is engaged with the gear portion of the steering member 40. Thus, by operating the steering handle 45, the steering member 40 is swung around the vertical axis P2, and the right and left front wheels 1 are steered left and right.

  The state shown in FIG. 3 is a state in which the right and left front wheels 1 are steered to the straight traveling position, and the right and left side clutches 53 are operated in the transmission state, and the right and left front wheels 1 and right Power is transmitted to the left rear wheel 2. Even if the steering member 40 is swung by the steering handle 45 and the right and left front wheels 1 are steered in the range of the right and left set angles from the rectilinear position, the elongated holes 40a of the steering member 40 Due to the accommodation, the right and left operation rods 42 are not operated, and the right and left side clutches 53 are maintained in a transmission state.

  As shown in FIG. 3, when the steering member 40 is swung by the steering handle 45 and the right and left front wheels 1 are steered right beyond the right set angle, the steering member 40 The operating rod 42 is pulled and the right side clutch 53 is operated from the transmission state to the cutoff state (power is transmitted to the right and left front wheels 1 and the left rear wheel 2). When the steering member 40 is swung by the steering handle 45 and the right and left front wheels 1 are steered to the left beyond the left set angle, the left operating rod 42 is pulled by the steering member 40. Thus, the left side clutch 53 is operated from the transmission state to the cutoff state (power is transmitted to the right and left front wheels 1 and the right rear wheel 2).

  As described above, when the right and left front wheels 1 are steered to the right (left) beyond the right (left) setting angle, power is transmitted to the right and left front wheels 1 and the rear wheel 2 outside the turn. In this state, the rear wheel 2 on the turning center side is in a free rotating state. As a result, the rear wheel 2 on the turning center side slowly rotates along with the turning, and the state in which the field surface is roughened by the rear wheel 2 on the turning center side is reduced.

  As shown in FIGS. 1 and 2, the operation arm 46 is configured by bending the round pipe into a vertically long arch shape, and the right and left lower portions of the operation arm 46 are connected to the support frame 38. As a result, the driver who has descended from the aircraft to the ground has the operation arm 46, so that it is stable to enter the paddy field and exit from the paddy field while holding the lift of the front of the aircraft by the operation arm 46. You can do it.

[5]
Next, the transmission lever 52 will be described.
As shown in FIG. 7, inside the front and rear covers 47, 43, one round bar-like operation rod 36 is parallel to the handle post 32 and the steering operation shaft 44, and the handle post 32 and the steering operation shaft 44. The support plates 34 and 57 are rotatably supported so as to be positioned on the left lateral side of the.

  As shown in FIGS. 1, 2, and 7, the upper part of the operating rod 36 is bent sideways to form a speed change lever 52, and the speed change lever 52 is located on the lower left side of the steering handle 45 and left outer left side. It is extended towards. An operation arm 36a is connected to the lower part of the operation rod 36, and the operation arm 36a of the operation rod 36 faces the opening 43a on the side of the rear cover 43, and a transmission operation unit (not shown) of the transmission case 5 A linkage rod 54 is connected across the operation arm 36 a of the operation rod 36.

  Thus, by swinging the speed change lever 52 around the axis of the operation rod 36, the gear transmission of the transmission case 5 is moved to the reverse position, neutral via the operation rod 36 (operation arm 36a) and the linkage rod 54. It can be operated to position, planting travel position (medium speed position), heel overpass position (low speed position) and moving position (high speed position).

[6]
Next, the accelerator lever 35 (corresponding to a traveling operation lever) will be described.
As shown in FIGS. 6 and 7, a support plate 50 is connected to the lower part of the handle post 32 inside the front and rear covers 47 and 43, and a single round rod-like operation rod 37 is connected to the handle post 32 and The support plates 34, 50 and 57 are rotatably supported so as to be parallel to the steering operation shaft 44 and located on the right side of the handle post 32 and the steering operation shaft 44.

  As shown in FIGS. 2 and 5, the upper part of the operation rod 37 is bent sideways to constitute an accelerator lever 35, and the accelerator lever 35 is located on the lower right side of the steering handle 45 and is It is extended outward. Accordingly, by operating the accelerator lever 35 back and forth, the operation rod 37 is rotated around an axis parallel to the rotation axis of the steering handle 45 (steering operation shaft 44).

  As shown in FIGS. 6 and 7, an operation arm 51 having an L-shape in plan view is connected to the lower portion of the operation rod 37, and the operation arm 51 is disposed so as to contact the lower surface of the support plate 50. An L-shaped bracket 56 in side view is supported on the first arm portion 51a of the operation arm 51 by a pin 56a so as to be rotatable around the longitudinal axis P3, and the end portion of the outer 55b of the wire 55 (corresponding to the linkage mechanism). Is attached to the bracket 56, and the tip of the inner 55 a of the wire 55 is attached to the arm portion 50 a of the support plate 50.

  As shown in FIGS. 6 and 7, the support plate 50 is formed with an arc-shaped long hole 50 b centering on the position of the operation shaft 37. A bolt 58 is connected to the second arm portion 51 b of the operation arm 51 and is inserted into the elongated hole 50 b of the support plate 50 from below, and a nut 59 is attached to the upper portion of the bolt 58. A coil-type spring 64 and a washer 67 are fitted on the bolt 58 so as to be positioned between the nut 59 and the upper surface of the support plate 50, and the second arm portion 51 b of the operation arm 51 and the lower surface of the support plate 50 are A washer 67 is fitted around the bolt 58 so as to be positioned between them.

  As a result, as shown in FIGS. 6 and 7, by operating the accelerator lever 35 back and forth, the operating rod 37 and the operating arm 51 are rotated (oscillated), and the outer 55b of the wire 55 is pushed and pulled. The operation range of the accelerator lever 35 (the operation rod 37 and the operation arm 51) is determined by the long hole 50b of the support plate 50.

  As shown in FIGS. 6 and 7, since the support plate 50 (the long hole 50b) is sandwiched between the washers 67 by the biasing force of the spring 64, the accelerator lever 35 and the operating rod are released even if the hand is released. 37 and the operation arm 51 are frictionally held at a predetermined angle, and by rotating the nut 59, the pressing force of the spring 64 can be changed and the frictional force can be adjusted to be large or small. Thus, the holding mechanism 68 is constituted by the bolt 58, the nut 59, the spring 64, and the washer 67.

[7]
Next, a link structure between the accelerator lever 35 and the accelerator operation part 69 (corresponding to the operated part) will be described.
As shown in FIGS. 6 and 7, the wire 55 is attached to the opening of the rear cover 43 by a rubber grommet 70 and extends rearward. As shown in FIGS. 4 and 5, the wire 55 extends rearward on the right lateral side of the support frame 13 while passing over the front axle case 12 and the pedal arm 61. A resin attachment member 71 is attached to a portion of the horizontal frame 15 between the right support frame 10 and the vibration isolating rubber 23, and a wire 55 is attached to the attachment member 71.

  As shown in FIGS. 4 and 5, a cooling fan (not shown) and a cover 22d for covering the cooling fan are provided on the right side of the engine 22 (crankcase 22a). A fuel discharge hose 72 extends downward from the bottom of the fuel tank 8, and a fuel cock 73 is connected to the right lateral side of the support frame 13 (below the cylinder 22 b of the engine 22) via a stay 74. The hose 72 is connected to the fuel cock 73.

  As shown in FIGS. 4 and 5, the wire 55 passes from the attachment member 71 to the lower side of the cover 22 d of the engine 22 and passes between the fuel cock 73 and the hose 72 (support frame 13) on the lower side of the stay 74. And enters the rear side of the engine 22. The wire 55 passes between the engine 22 (cylinder 22 b) and the transmission case 5, passes between the left vibration-proof rubber 26 b and the hose 72 between the transmission case 5 and the support plate 24, and passes through the fuel tank 8. The hose 72 enters the rear side on the lower side. The wire 55 that has entered the rear side of the hose 72 enters the right side of the hose 72 so as to make a U-turn, extends forward from the upper side of the support plate 24, and an accelerator operation unit 69 provided at the upper part of the engine 22. It is connected to the.

  As a result, as shown in FIGS. 2, 6, and 7, when the accelerator lever 35 is operated backward, the operation rod 37 and the operation arm 51 are rotated (oscillated) in the clockwise direction in FIG. The outer 55b is pushed backward, the inner 55a of the wire 55 is pulled, and the accelerator operating portion 69 is operated to the high speed side. When the accelerator lever 35 is operated forward, the operation rod 37 and the operation arm 51 are rotated (oscillated) in the counterclockwise direction in FIG. 7, and the outer 55 b of the wire 55 is pulled backward, so that the wire 55 The inner 55a is pushed and the accelerator operation unit 69 is operated to the low speed side (because the accelerator operation unit 69 is biased to the low speed side).

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the accelerator lever 35, the operating rod 37, and the wire 55 are provided on the left side of the handle post 32 and the support frame 13, and the wire 55 is provided on the right side of the support frame 13. The engine 22 may be configured to pass under the crankcase 22a of the engine 22.
Although the upper portion of the operation rod 37 is bent and the accelerator lever 35 is integrally formed with the operation rod 37, the accelerator lever 35, which is a separate member from the operation rod 37, may be connected to the operation rod 37 by welding, bolts, or the like. Instead of the wire 55, a linkage mechanism may be configured by an operating rod.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment], the wire 55 does not pass between the hose 72 or the transmission case 5 and the support plate 24, and the engine 22 ( You may comprise so that it may be directly connected to the accelerator operation part 69 from between the cylinder 22b) and the mission case 5. FIG.
The configurations of [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] and [Second Alternative Embodiment of the Invention] may be applied to the transmission lever 52.

[Third Another Embodiment of the Invention]
As shown in FIG. 9, the handle portion 16 d, which is a separate member from the back portion 16 b of the driver seat 16, is connected to the back portion 16 b of the driver seat 16 without forming the opening 16 c in the back portion 16 b of the driver seat 16. You may comprise.
The driver's seat 16 may be formed in a hollow shape by blow molding or the like, and the driver's seat 16 may be used as a fuel tank. In this case, the fuel tank 8 shown in FIGS. 1 and 2 is not necessary.

  The present invention can be applied not only to a riding type rice transplanter but also to a paddy field working machine such as a riding type direct seeding machine or a riding type management machine.

DESCRIPTION OF SYMBOLS 1 Front wheel 22 Engine 32 Handle post 35 Operation lever 37 Operation rod 45 Steering handle 51 Operation arm 55 Linking mechanism, wire 64 Spring 68 Holding mechanism 69 Operated part, accelerator operating part

Claims (3)

A handle post that rotatably supports a steering handle that steers the front wheel is provided, and a traveling post provided on the lower side of the steering handle so as to be operable around an axis parallel to the rotation axis of the steering handle. With an operating lever,
An operation rod that transmits the operation of the operation lever as a rotation extends from the operation lever along the handle post to the lower portion of the handle post, and the lower portion of the operation rod and the operated portion for traveling are linked by a linkage mechanism. Connected and configured to operate the operated part by the operation lever,
A paddy field work machine provided with a holding mechanism capable of holding the operation lever at a predetermined angle by holding the operation rod at a lower portion of the operation rod. The linkage mechanism is connected to an operation arm provided at a lower portion of the operation rod, and the linkage mechanism is pushed and pulled by the swing of the operation arm due to the rotation of the operation rod, so that the operated portion is operated. Configured to be
The paddy field work machine according to claim 1, wherein the holding mechanism is configured so that the operating lever can be held at a predetermined angle by applying a frictional force by a spring to the operating arm. The linkage mechanism is constituted by a wire, and the operated part is an accelerator operating part on an upper part of an engine provided behind the handle post.
The paddy field work machine according to claim 2, wherein the wire extends rearward from the operation arm and is connected to the accelerator operation unit from the lower side of the engine through the rear side of the engine.

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