JP2002293253A - Passenger work machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To allow a traveling work machine to easily operate a traveling machine body from the ground and to appropriately support a center mascot. SOLUTION: An operation arm 16 for ground operation is provided at a front portion of the traveling body so as to be switchable between a retracted posture retracted to the traveling body side and an action posture projected forward. A center mascot 21 as an aiming tool indicating the left and right centers of the traveling aircraft,
The operation arm 16 is provided so as to be able to move up and down freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a riding rice transplanter, when a traveling machine is taken in and out of a field or unloaded on a truck bed or the like, the traveling machine may be tilted back and forth. It is desirable that the ship descends on the ground. As a means for responding to such a demand, as disclosed in, for example, JP-A-7-96839 or JP-A-7-96840, an auxiliary handle lever is attached to a pitman arm that steers a front wheel to perform ground work. Means have been proposed in which a pitman arm is forcibly operated by a person swinging an auxiliary handle lever in front of a traveling body.

[0003]

According to the structure described in the prior art, it is necessary for an operator to operate the vehicle from the ground to move the vehicle into and out of the field and to load and unload the vehicle into and from a truck bed. But the auxiliary handle lever swings right and left integrally with the pitman arm,
At the time of normal traveling in which an operator rides on a traveling machine and steers, it is necessary to be configured to be detachable so that the auxiliary handle lever can be detached from the pitman arm. However, in a rice transplanter that performs paddy work,
Mud easily adheres to the pitman arm located at the lower part of the front part of the traveling aircraft, so if mud adheres to the auxiliary handle lever connection part provided on the pitman arm, it may be difficult to attach and detach the auxiliary handle lever, There was a problem in terms.

Since the riding rice transplanter uses the rear wheels as the main propulsion wheels, when the traveling body is driven to climb uphill by forward movement, the front part of the traveling body tends to float due to the propulsion reaction force, and the contact pressure of the front wheels decreases, and the front wheels decrease. Thrust may be reduced. In this case, an operator on the ground pushes down the front part of the traveling body to suppress the rising of the front part of the traveling body, but in the structure described in the related art, the auxiliary handle lever is attached to the pitman arm. Therefore, if an operation such as pushing down the front part of the traveling body with the force applied to the auxiliary handle lever is performed, the pitman arm may be deformed or damaged.

[0005] It is an object of the present invention to provide a riding work machine capable of easily controlling a traveling body from the ground.

[0006]

[Means for Solving the Problems] [Structure] A feature of claim 1 is that a riding work machine is structured as follows. A center mascot as a sighting device that is provided at the front of the traveling aircraft and that can indicate the left and right center of the traveling aircraft so that the operation arm for ground operation can be switched between the retracted attitude toward the traveling aircraft and the operating attitude that projects forward. Is provided on the operation arm so as to be able to pivot up and down.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a riding rice transplanter as an example of a riding work machine according to the present invention. The riding rice transplanter is mounted on a rear part of a four-wheel drive type traveling machine body 3 having a steerable front wheel 1 and a rear wheel 2 as a main propulsion wheel via a hydraulically driven link mechanism 4 and a seedling planting device 5. Are connected so as to be able to move up and down. The engine 6 mounted on the front part of the traveling machine body 3 and the transmission case 7 supporting the front wheels 1 are interlocked via a belt transmission 8, and the transmission case 7 uses the power switched between gear shift and forward / reverse rotation. The front wheel 1 is driven. The driving power taken out of the transmission case 7 is transmitted to the rear transmission case 9,
The rear wheel 2 is driven at a speed synchronized with the front wheel 1, and the working power taken out of the transmission case 7 is supplied to the seedling planting device 5.
Is transmitted to

As shown in FIGS. 2, 3, and 4, an engine hood 10 containing an engine 6 is provided at the front of the traveling body 3.
Is provided on the left and right sides and outside of the engine bonnet 10,
A stand 11 for spare seedlings is provided upright, and a boarding / alighting passage 12 is formed between the engine bonnet 10 and the stand 11 for spare seedlings to allow a walking movement between the front end of the traveling machine body 3 and the operating unit. I have.

As shown in FIGS. 2, 6 (a), 7 (a), and 9, a front frame 13 for mounting a battery is provided at a lower portion of the front end of the traveling body 3, and the front and rear sides of the front frame 13 are laterally laterally outward. A tow frame 15 in which a pipe material is bent in a U-shape is provided at a front portion of a guard frame 14 provided so as to surround. On the left and right sides of the guard frame 14, an operation arm 16 for ground operation is mounted so as to be able to swing up and down around a horizontal fulcrum a. The operation arm 16 is formed by bending a round pipe material into an arch shape extending downward, and the middle portion is provided with a stay 1.
6a, it is configured in an A-shape.

As shown in FIG. 2, the operation arm 16 is configured to have a width that fits within the lateral width of the engine bonnet 10 so as not to hinder walking movement in the getting-in / off passage 12.
As shown in FIG. 2, the upper end of the operation arm 16 in the storage posture standing upright in a substantially vertical position is configured to be located at a height at which a worker sitting on the driver's seat 17 can visually check through the engine hood 10. I have. FIGS. 6A and 7
As shown in (a), the base of the operation arm 16 is mounted on the left and right sides of the guard frame 14 so as to be able to undulate and swing.
Are connected by As shown in FIG.
By tightening the disc spring 19 provided at the connection point 8, an appropriate frictional resistance is given to the oscillating movement of the operating arm 16, and the operating arm 16 can be manually oscillated arbitrarily, and It can be frictionally held in the retracted posture.

As shown in FIGS. 6A and 9, a stopper 20 is fixed to the left and right sides of the guard frame 14, and the base of the operation arm 16 contacts the front end of the stopper 20. The rising limit of the operation arm 16 is set. As shown in FIG. 6B, when the base of the operation arm 16 contacts the lower surface of the stopper 20, a falling limit is set forward of the operation arm 16. The operation arm 16 raised up to the limit has a substantially vertical storage posture, and the operation arm 16 in the operation posture lying down to the limit is inclined slightly upward.

As shown in FIGS. 4 and 5, the distal end of the operating arm 16 has an appropriate width enough to be gripped sideways so that the operating arm 16 in the working posture can be easily pushed down or pulled forward. It is comprised in the horizontal grip part 16b. On the rear surface of the stay 16a of the operation arm 16, a center mascot 21 as an aiming tool indicating the left and right centers of the traveling machine body 3 is provided so as to be able to move up and down around a fulcrum b. As shown in FIG. 2, a nameplate 22 displaying a commercial nickname, a model name, and the like of the operation arm 16 is attached to a front surface of the stay 16a.

Although the operating arm 16 can be manually oscillated arbitrarily, an upright urging mechanism 30 as described below is provided to assist the oscillating operation of the relatively heavy operating arm 16. Provided. As shown in FIGS. 6A and 6B and FIGS. 7A and 7B, a rod 31 is extended rearward from a link fitting 16c provided near a fulcrum a on the left side of the operation arm 16, A rod 31 extends rearward through a fixing bracket 32 provided on the left side of the guard frame 14. A coil spring 34 is provided between the spring receiving washer 33 provided at the distal end of the rod 31 and the fixing bracket 32. Thus, the swinging operation of the operation arm 16 from the retracted position to the front causes the rod 3 to move forward.
1 is pulled out forward, the coil spring 34 is compressed and deformed.
6 is urged in the upright direction.

In the range in which the operation arm 16 is pivoted slightly forward from the retracted position, the frictional resistance of the fulcrum a is set to be larger than the elastic restoring force of the coil spring 34. The operation arm 16 can be held at an arbitrary angle. As a result, the position of the center mascot 21 can be adjusted back and forth within a certain range, and the center mascot 2 can be held.
1 can be set at a position that is easy for the operator to see and use. When the operation arm 16 is largely swung forward, the elastic biasing force of the coil spring 34 is larger than the frictional resistance of the fulcrum a. Rocks.

The assembly of the rod 31 and the coil spring 34 is performed as follows. As shown in FIGS. 6B and 7B, the spring receiving washer 33 is attached to the rod 31 before assembly.
And the coil spring 34 attached thereto, and the coil spring 34 received by the spring receiving washer 33 is compressed using a jig or the like,
A temporary fixing pin 36 is inserted into a pin hole 35 formed beforehand in the middle of the rod 31, so that the compressed coil spring 34 is prevented from restoring. The rod 31 attached by compressing the coil spring 34 is inserted from the side into a rod insertion hole 37 formed by notching the fixing bracket 32 in a lateral direction.
1 is connected to the connection bracket 16c of the operation arm 16 previously attached to the fulcrum a. The operating arm 16 is swung forward largely to move the rod 3 to the position shown in FIG.
Pull 1 forward.

Thus, the previously compressed coil spring 34
The temporary fixing pin 36 that has received the front end of the rod passes through the rod insertion hole 37 forward. At this time, the coil spring 34 is received by the fixing bracket 32 and further compressed and deformed, while the temporary fixing pin 36 is detached from the coil spring 34 and exposed to the front of the fixing bracket 32, and the reaction force of the coil spring 34 is reduced. Since the temporary fixing pin 36 which is in a free state which is not received can be easily removed from the rod 31, the assembly of the rod 31 and the coil spring 34 is completed.

A steering restraint mechanism 40 for restricting the steering of the front wheel 1 when the operating arm 16 is pivoted forward is provided near the base of the operating arm 16 as follows. As shown in FIGS. 6 (a), (b), 7 (a), (b), and 8, the steering restraint member 42 is attached to the bracket 41 fixed to the front end of the transmission case 7 via the support shaft 43. Heart c
A projection 45 is provided on the upper surface of the pitman arm 44 for steering around the front wheel 1 provided on the transmission case 7 so as to be engaged with the steering restraint member 42. The upper extension end 46a of the torsion spring 46 fitted on the support shaft 43 is wound around the rear end of the rod 31 and is prevented from coming off by the pin 47, and the lower extension end 46b of the torsion spring 46 is operated. It is connected to the direction restraint member 42.

As a result, the upwardly extending end 46a of the torsion spring 46 is pressed and moved forward along with the forward movement of the rod 31, and the entire torsion spring 46 rotates around the support shaft 43. The lower extension end 46b of the torsion spring 46 moves rearward, and the steering restraint member 42 rotates counterclockwise around the axis c in the drawing. The engagement action portion 42a provided at the lower end of the steering restraint member 42 elastically engages with the projection 45 of the pitman arm 44 from the front, and as the forward movement of the rod 31 increases, the torsion increases. The amount of torsional deformation of the resilient spring 46 is increased, and the engaging action of the engaging action portion 42a on the projection 45 is increased.

As shown in FIG. 7A and FIG.
5 is formed in a chevron shape toward the front, and the engaging action portion 42a is formed in a V shape opened backward. Even if the pitman arm 44 is operated slightly to the left or right from the straight-ahead position, the pitman arm 44 is corrected to the straight-ahead position by the V-shaped engaging action portion 42a being pressed by and engaged with the chevron-shaped projection 45. It is stably engaged and held at the position.
As described above, when the operation arm 16 is swung forward,
The pitman arm 44 is stably held at the straight traveling position, and the front wheel 1 is prevented from being steered without permission due to unevenness of the road surface or the like.

Since the engaging portion 42a is elastically engaged with the projection 45, the steering handle 23 of the driving portion is provided.
Is forcibly operated, the protrusion 45 is moved to the steering restraint member 42.
It is possible to operate the pitman arm 44 so that the pitman arm 44 moves over the engaging action portion 42a while pushing forward against the torsion spring 46. Operation arm 16
The front wheel 1 is not steered by itself due to unevenness of the road surface, etc., but another operator forcibly operates the steering handle 23 by turning the steering wheel 23 forward. The front wheel 1 can be steered.

As shown in FIGS. 6 (a) and 6 (b), an upper end 46a of the torsion spring 46 is attached to the distal end of the rod 31 for linking the operating arm 16 and the steering / pulling mechanism 40. The attached position of the pin 47 can be changed, and by changing the attached position of the pin 47, the swing angle of the operation arm 16 when the steering and restraining mechanism 40 starts operating can be adjusted. .

As shown in FIG. 10, the belt transmission 8
Are connected to the output shaft 6a of the engine 6 and the input shaft 7a of the transmission case 7 by two sets of output pulleys 51 having different transmission ratios.
a, 51b and input pulleys 52a, 52b are attached, and output pulleys 51a, 51b and input pulleys 52a,
The belts 53a and 53b are wound around the
A double-tension type shifting function configured to perform two steps of “high” and “low” by selectively operating the tension rollers 54a and 54b with respect to “a” and “53b” is provided. The tension arms 55a and 55b having the tension rollers 54a and 54b
Is linked via two sets of link mechanisms 56a and 56b.

As shown in FIG. 1 and FIG. 5, the main gear transmission of the transmission case 7 is shifted to three speeds, so that "high speed" for traveling and traveling, "low speed" for planting and ridge crossing. A main transmission lever 25 for performing a switching operation of “ultra low speed” for loading / unloading the vehicle is provided at the center front portion of the driving unit step 26 so as to be able to perform a lateral movement operation. As shown in FIGS. 1 and 4, a shuttle lever 2 for performing a gear shift of the transmission case 7 by a forward and backward swing operation to select between forward and reverse travel.
7 is provided on the left side of the steering handle 23.

As shown in FIG. 10, two sets of tension rollers 54a and 54b for performing two shifts of "high" and "low" function so as to function also as the main clutch 57.
A contact portion 59 is provided on the pedal arm 58a of the main clutch pedal 58 provided at the left front portion of the driving unit step 26, and the extension portions of the base ends of the tension arms 55a and 55b are arranged so as to face the contact portion 59. When the main clutch pedal 58 is depressed, the tension arms 55a and 55b are operated to the clutch disengagement side,
A main clutch 57 of a tension clutch type that interrupts transmission from the engine 6 to the transmission case 7 is configured. As shown in FIGS. 11 (a), (b) and FIG. 12, a brake 60 is provided on the lower side of the transmission of the main clutch 57 to apply a brake to the input shaft 7a of the transmission case 7 to stop the traveling machine body 3. I have.

As shown in FIGS. 11A and 11B and FIG. 12, a stop lever 62 and a brake arm 63 for simultaneously operating the main clutch 57 and the brake 60 are provided on a fulcrum shaft 61 supporting the pedal arm 58a. Is supported and extends forward, and the pedal arm 58a and the stop lever 62 are urged upward by torsion springs 64 and 65. At the tip of the fulcrum shaft 61, a pedal arm 58a, a stop lever 62
Further, a washer 66 for preventing the brake arm 63 from coming off is attached via a bolt 67. As shown in FIG. 14, the extending end of the washer 66 is non-rotatably engaged with a horizontal frame 68 constituting the body frame. Then, a part of the washer 66 is bent so as to engage with the head flat surface of the bolt 67, and the bolt 67 is prevented from rotating.

As shown in FIGS. 11 (a), (b) and FIG. 12, the stop lever 62 is arranged to cross the pedal arm 58a from above, and when the stop lever 62 is operated downward, the pedal arm 58a Is pressed down by the one-side contact of the stop lever 62 from above, and the main clutch 57 is disengaged. When the main clutch pedal 58 is depressed, the stop lever 62 remains at the return position. As shown in FIG. 2 and FIG.
Is arranged close to the left lateral side of the engine hood 10 so as not to hinder the walking movement in the getting-in / off passage 12. The left and right lateral surfaces of the engine bonnet 10 are formed in a curved surface that is three-dimensionally convex outward, and the stop lever 62 extends forward from the convex top of the left lateral surface of the engine bonnet 10. Therefore, the stop lever 62
Even if the main body is arranged close to the left lateral side of the engine hood 10, the lever grip portion 62b of the stop lever 62 can be arranged away from the left lateral side of the engine bonnet 10 so as to be easily gripped.

As shown in FIGS. 11 (a), (b), 12, and 13, the input pulley 52a,
A brake pad 70 acting on a belt winding groove of an outer input pulley 52a of the outer pulley 52b is provided, and a stop lever 62 and a brake arm 63 are connected to a compression coil spring 71.
Are connected via a rod 72 externally fitted. As the stop lever 62 is operated downward and the main clutch 57 is disengaged, the brake arm 63 is also operated downward to apply a brake to the input pulley 52a.
Is configured. When the stop lever 62 is operated downward, the main clutch 57 is actuated so that the brake 60 begins to act before the main clutch 57 is completely disengaged.
And the operation timing of the brake 60 are set.

As shown in FIG.
The brake pad 70 is slightly engaged with the belt winding groove of the input pulley 52a in the brake release position in which the brake pad 63 has returned, so that even when the brake arm 63 moves slightly laterally, the brake pad 70 is correctly input when the brake 60 operates. It is pressed into the belt winding groove of the pulley 52a. Rod 7
The reference position of the brake arm 63 at the brake release position can be adjusted by adjusting the mounting position of the pin 73 provided at the lower end of the second 2, and the timing at which the brake 60 starts to operate can be adjusted. Rod 72
The initial compression state of the compression coil spring 71 can be adjusted by adjusting the position of the spring receiving pin 74 attached to the upper part of the brake 60, and the pressing force of the brake pad 70 on the input pulley 52a when the brake 60 is operated can be reduced. Can be adjusted.

As shown in FIGS. 11 (a), (b) and FIG. 12, a locking lever 75 which engages with a latch 58b of the main clutch pedal 58 which has been depressed is provided on the left elevating passage 12 with a fulcrum d. The main clutch 5 is provided so as to be able to swing back and forth and is urged forward.
7 can be kept in the cut operation state.

As shown in FIGS. 11A, 11B and 12, a locking pin 76 with a head is provided on the side surface of the locking lever 75 on the side of the stop lever 62. Lock pin 76 with head
Is out of the swing operation path of the stop lever 62,
As shown by the two-dot chain line in FIG. 11B and FIG. 12, the stop position (the disengagement state of the main clutch 57 and the brake 6
0 operating state), the stop lever 62 is elastically displaced toward the locking lever 75 side and locked from below by the headed locking pin 76, thereby holding the stop lever 54 in the stopped position. I can put it.

As shown in FIGS. 11A and 11B and FIG. 12, the main clutch pedal 58 is provided above the stop lever 62.
Is provided with a stepped portion 62a that overlaps from the rear at the right end. When the stop lever 62 is depressed by operating the stepping portion 62a of the stop lever 62 held at the stop position by the headed locking pin 76 as described above while the driver is seated on the driver seat 17, the head The stop lever 62 detached from the attached locking pin 76 returns to the original lateral position. When the stepping operation of the stepping portion 62a is stopped in this state, the stop lever 62 returns to the initial position (the engaged state of the main clutch 57 and the released state of the brake 60) without interfering with the locking pin 76 with the head. Accordingly, the main clutch pedal 58 also returns to the clutch engagement position.

As shown in FIGS.
The preliminary seedling rest 11 provided on the outside of the vehicle is provided with a support base 81 having an arch-shaped support 80 fixed to the traveling body 3.
And a plurality of seedling resting plates 82 supported in a cantilever outward shape on a support 80. As shown by the two-dot chain line in FIG. 4 and FIG.
By rotating the rear support 80b backward about the vertical axis e of the rear support 80b by about 180 degrees, the spare seedling rest 11 can be stored in a state in which the seedling rest 82 is prevented from protruding laterally outward. This is convenient when the traveling body 3 is loaded on a vehicle or stored in a garage. In particular, when the reserve seedling rest 13 on the left side is rotated rearward, the periphery of the stop lever 62 is widely vacant, and the operation of the operation lever 16 can be easily performed when operating the ground using the operation arm 16.

As shown in FIG. 2, while the vertical axis e is set to be vertical, the support column 80 is tilted inside the traveling body 3 by a small angle (for example, several degrees) in a normal use posture. When the entire stand 11 is rotated backward by about 180 degrees about the longitudinal axis e, the support column 80 is inclined to the outside of the traveling machine body 3. This avoids that the seedling resting plate 82 of the spare seedling rest 13 that has pivoted rearward enters the inside of the traveling machine body 3 greatly and interferes with the shuttle lever 27 and the like.

The mat-shaped seedling placed on the seedling rake plate 83 is placed on the seedling laying plate 82, and the used seedling rake plate 83 remaining after the mat-shaped seedling is supplied to the seedling planting device 5 is removed. It is configured to keep the seedlings on the uppermost seedling plate 82. As shown in FIGS.
A holding rod 84 bent in an arch shape is installed so as to be vertically rotatable around a fulcrum f in the front-rear direction.
A toggle spring 85 is attached across the rear support 80b, and the holding rod 84 is configured to be able to switch and hold between the non-operation position in which the holding rod 84 is swung upward and the operation position in which the pressing rod 84 is placed on the seedling resting plate 82 beyond the dead point DP. ing. Therefore, when the mat-like seedlings are fully loaded,
When the mat-type seedlings are replenished and the top plate 82 of the top seedling is vacant, the used seedling rake plate 83 is used as the top plate 82 of the top seedling.
Is placed, and the used seedling rake plate 83 is elastically pressed and held by the holding rod 84 switched to the operating position, so that the used seedling rake plate 83 is stored so as not to be blown off by wind or the like.

As shown in FIG. 15, the rear support 80b is
A rear support shaft 86 fixed to the support base 81 is rotatably fitted around a vertical axis e so as to be rotatable around the center, and is supported by a set bolt 87 so as not to come off. The lower end of the front support column 80a is fixed to the support base 81. The front support shaft 88 is connected to the upper end of the front support shaft 88 in a state where the front support shaft 88 is abutted and opposed. As shown in FIGS. 16 and 17, at the lower end of the front support column 80 a, a positioning bracket 89 having a U-shaped cross section opened toward the inside of the traveling body 3 is provided so as to protrude downward. The front support shaft 8
The front support shaft 88 and the front support column 80a are positioned concentrically and abutted up and down by fitting the front support shaft 88 and the front support column 80a to each other.

As shown in FIGS. 16 and 17, a horizontal support shaft 90 is slidably penetrated below the front support column 80a, and a hook 91 is attached to a protruding end of the support shaft 90 inside the traveling machine body 3. The latch 91 is urged to the front support shaft 88 together with the support shaft 90 by a spring 92 which is provided and externally fitted to the support shaft 90. The latch 91 is provided with a lever 93. The positioning bracket 89 is fitted to the front support shaft 88 from the lateral outside, and the front support shaft 88 and the front support column 80a are concentrically positioned and vertically moved. With the lever 93
Is pivoted upward about the support shaft 90, so that the latch 91 is locked to the back of the front support shaft 88, and the front support 80 is rotated.
a from the front support shaft 88 in a laterally outward direction.
An engagement groove 94 is formed in an annular shape on the outer peripheral surface of the front support shaft 88,
A locking pin 95 is protruded from the inner surface of the positioning bracket 89,
The locking pin 95 is engaged with the locking groove 94 in a state where the front support 80 a is connected to the front support shaft 88, and the front support 80 a
Are also prevented from coming off with respect to the front support shaft 88. Conversely, by operating the lever 93 forward to remove the latch 91 from the front support shaft 88, the entire stand 11 can be rotated backward about the longitudinal axis e.

As shown in FIG. 3, the rear support shaft 86 is provided with a seedling marker 100 which is used when the traveling machine 3 is moved along a row of seedlings previously planted. The seedling marker 100 has a marker arm 102 swingably connected to a bracket 101 fixed to a rear support shaft 86 around a vertical fulcrum g, and a marker rod 103 attached to the tip of the marker arm 102 is provided with a rubber cap. The marker bar 103 is slid up and down to an arbitrary height by the frictional resistance of the penetrating portion with the rubber cap 104.

As shown in FIG. 18, when the bracket 101 is provided with a locking member 105 made of a spring plate in a cantilever shape, and when the stand 11 for the spare seedling is rotated backward by about 180 degrees, the lower end of the rear column 80b is lowered. Vertical pin 1 fixed nearby
Reference numeral 06 elastically engages with the locking fitting 105, and the spare seedling rest 11 is held in a state of being rotated backward.

The riding rice transplanter according to the present invention is constructed as described above. When the operator normally rides on the driver's seat 17 and steers, as shown in FIGS. Swing to the retracted position and move the center mascot 2
1 is standing. In this case, the main clutch pedal 5
Even if the main clutch 57 is disengaged by depressing the brake pedal 8, the stop lever 62 remains, so that the brake 60 is not operated to the braking side.

It is difficult to operate the traveling machine 3 with the traveling body 3 inclined forward and backward, for example, when moving over the ridges for putting the rice transplanting machine into and out of the field, or when loading and unloading the riding rice transplanter on the bed such as a truck. In this case, the main shift lever 25 is set to "ultra low speed".
Operating the auxiliary transmission lever 24 to "low speed", setting the output of the engine 6 appropriately high by operating the accelerator, and making the traveling body 3 self-propelled in a state where it can travel at a low speed with a high torque. Man descends on the ground and steers. In this case, the front wheel 1 is set in the straight traveling state, and the operation arm 16 is swung to the operation posture that protrudes largely forward.

For example, as shown in FIG. 20, when the vehicle is moving forward with an upward slope, the front part of the traveling machine body 3 may be slightly lifted by the propulsion reaction force.
By pushing down 6 to apply a downward load to the front part of the traveling body 3, the lifting of the front part of the traveling body 3 can be suppressed. When the road surface is bad and it is difficult to climb, the operation arm 16 can be pulled forward to assist climbing. The direction of the traveling body 3 can be forcibly corrected by pushing and pulling the operation arm 16 to the left and right as necessary. In such an operation,
The front wheel 1 is stably held in the straight running direction by the traveling restraint mechanism 40, and the traveling body 3 does not move in an unexpected direction due to the steering operation of the front wheel 1 arbitrarily due to unevenness of the road surface or the like.

When the operator on the ground stops the traveling body 3 while operating the traveling body 3, if the stop lever 62 is operated downward, the main clutch 57 is disengaged and the brake 60 is operated to the braking side. Then, the traveling body 3 stops immediately. In this case, since the brake 60 acts first, only the main clutch 57 is disengaged first, so that the free running body 3 does not slip down.

When it is desired to maintain the stopped state of the traveling machine body 3, the stop lever 62 at the stop position is elastically displaced slightly laterally as it is, and the locking pin 76 with the head of the locking lever 75 is provided.
Can be locked and held. To release the stop lever 62 from the stop position, the stop lever 62 may be manually released from the locking pin 76 with the head, or may be returned from the driver's seat 17 by depressing the step portion 62a once.

[Another Embodiment of the Invention] The present invention can also be carried out in the following modes. As shown in FIG. 21, a torsion spring 4 is attached to the tip of a rod 31 for linking the operation arm 16 and the steering restraint mechanism 40.
Nut with washer 108 for receiving the upper extension end 46a of the nut 6
The swing angle of the operation arm 16 when the steering restraint mechanism 40 starts operating can be adjusted steplessly by adjusting the position of the nut 108 by attaching. If the nut 108 is largely moved rearward, even if the operation arm 16 is rocked to the limit, the steering restraint mechanism 4
It is also possible to set a state where 0 does not operate.

As shown in FIG. 22, the steering restraint member 4
The stopper 109 for preventing the rotation of the actuator 2 from the retracted position to the restraint position is connected to the actuator 11 such as a solenoid.
The actuator 110 may be connected to the control device 111 so that the stopper 109 can be moved back and forth in accordance with the working conditions as described below so as to be able to move back and forth in the front and back directions of the drawing.
A main shift sensor S1 for detecting whether the main shift lever 25 is at the "ultra low speed" position and a sub shift sensor for detecting whether the auxiliary shift lever 24 is at the "low speed" position S2: It is detected whether or not the planting lever 112 arranged on the right side of the driver's seat 17 for raising and lowering the seedling planting device 5 and transmitting power to the seedling planting device 5 is in the "planting" position. A planting sensor S3, a seat sensor S4 for detecting sitting on the driver's seat 17, and a spare seedling rest sensor S5 for detecting whether the left spare seedling rest 11 is rotated rearward are connected. The main transmission lever 25 is in the “ultra low speed” position, the sub transmission lever 24 is in the “low speed” position,
Is not in the “planting” position, the operator is not seated on the driver's seat 17, and the spare seedling rest 11 is rotated rearward, that is, when moving over ridges or loading / unloading the vehicle. When it is recognized that the suitable condition is satisfied, the stopper 109 is controlled to retreat, the turning of the steering restraint member 42 becomes possible, and the steering restraint mechanism 40 is activated.

In a normal planting operation state or a traveling traveling state on a road, the above-mentioned conditions are not satisfied. Therefore, even if the stopper 109 is controlled to protrude and the operation arm 16 is switched to the operating posture, the torsion spring is not used. 46 is torsionally deformed, the rotation of the steering restraint member 42 is prevented from contacting, and the steering restraint mechanism 4
0 does not operate.

A control release switch SW for releasing the operation of the steering control mechanism 40 by causing the stopper 109 to protrude is connected to the control device 111. Even if the operation arm 16 is switched to the operating posture, the steering is controlled. It is possible to arbitrarily set a restraint release state in which the restraint mechanism 40 is not operated.

As shown in FIG. 23, the operation arm 16
A stopper 113 for preventing the switch from being switched from the storage position to the operation position is provided so as to be able to move back and forth by an actuator 114 such as a solenoid.
May be connected to the control device 111 to control the movement of the stopper 113 depending on the working conditions as follows. As described above, the main transmission sensor S1, the auxiliary transmission sensor S2, the planting sensor S3, the seat sensor S4, and the spare seedling cradle sensor S5 are connected to the control device 111, and the main transmission lever 25 is in the "ultra low speed" position. , The auxiliary transmission lever 24 is in the “low speed” position, the planting lever 112 is not in the “planting” position, the operator is not seated on the driver seat 17, and the spare seedling rest 1
When it is recognized that 1 is rotated rearward, that is, it is recognized that the conditions suitable for moving over a ridge or unloading a vehicle are satisfied, the stopper 113 is controlled to retreat,
The operation arm 16 is allowed to be switched to the operating posture. In a normal planting operation state or a traveling traveling state on a road, the above-described conditions are not satisfied.
13 is controlled to protrude, and the operation arm 16 cannot be switched to the operating posture.

When the operating arm 16 is switched to the operating position in a state where the above conditions are satisfied, the operation path of the main transmission lever 25 and the operation path of the auxiliary transmission lever 24 are provided by the detection of the falling sensor S6 composed of a potentiometer. The stoppers 115 and 116 are controlled to protrude by actuators 117 and 118 such as solenoids, so that the main transmission lever 25 is prevented from moving from the “ultra low speed” position to the speed increasing side (transition to the neutral position is possible), and The shift lever 24 is configured to prevent the shift from the "low speed" position to the high speed side, and the operation arm 16 is switched to the operating posture to perform the operation from the ground to move over the ridges and unload the vehicle. On the way, the traveling speed change may not be carelessly operated from the extremely low speed state to the high speed side.

As means for releasing the operation of the steering restraint mechanism 40, in addition to the means for preventing rotation of the steering restraint member 42 as described above, a protrusion 45 provided on the pitman arm 44 is used by an actuator. It is also possible to leave.

As the operation arm 16, the traveling body 3
It is not limited to the one provided at the front end portion so as to be able to swing up and down. For example, as shown in FIG. It can also be configured and implemented. In this case, the front end of the operation arm 16 in the retracted storage position can be used as a protector at the front end of the traveling machine body 3.

The steering restraint mechanism 40 that operates when the operating arm 16 is switched to the operating position is configured to stably hold the front wheel 1 in a straight-ahead state. The front wheel 1 may be fixed or braked.

The steering restraint mechanism 40 may be configured to engage, fix, elastically hold, or frictionally hold the attitude of the front wheel 1 when the operating arm 16 is switched to the operating attitude.

In addition to acting on the pitman arm 44, the steering restraint mechanism 40 may be configured to have a structure in which the steering handle shaft is engaged or frictionally locked.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a front view of a front portion of the traveling body.

FIG. 3 is a perspective view of a front portion of the traveling body.

FIG. 4 is a plan view of a front portion of the traveling body.

FIG. 5 is a side view of a front portion of the traveling body in a state where the operation arm is switched to an operation posture.

FIG. 6 is a side view of the base of the traveling arm in the retracted position and the operating position.

FIG. 7 is a plan view showing a procedure for assembling the base of the operation arm and the coil spring.

FIG. 8 is a perspective view showing components of the steering restraint mechanism.

FIG. 9 is a front view showing a base of the operation arm.

FIG. 10 is a side view showing a belt transmission and an operation structure of the belt transmission.

FIG. 11 is a side view showing the brakes in a braking release state and a braking state.

FIG. 12 is a plan view showing an operation structure of a main clutch and a brake.

FIG. 13 is a front view of a brake.

FIG. 14 is a side view of a fulcrum of a brake arm.

FIG. 15 is a side view of the lower portion of the reserve seedling rest on the left side as viewed from the inside of the traveling vehicle.

FIG. 16 is a cross-sectional view taken along the line XX in FIG. 15;

FIG. 17 is a cross-sectional plan view showing the fixing structure of the front support of the preliminary seedling rest.

FIG. 18 is a cross-sectional plan view of the lower portion of the rear support of the reserve seedling rest.

FIG. 19 is a vertical sectional front view of the upper part of the stand for the spare seedlings.

FIG. 20 is a side view showing an example of a state in which an operator on the ground operates the traveling aircraft.

FIG. 21 is a side view showing a steering and restraining mechanism according to another embodiment of the invention;

FIG. 22 is a configuration diagram showing a steering and restraining mechanism according to another embodiment of the present invention.

FIG. 23 is a configuration diagram showing a steering and restraining mechanism according to another embodiment of the invention;

FIG. 24 is a perspective view of a front portion of a traveling vehicle according to another embodiment of the invention.

[Explanation of symbols]

 3 traveling body 16 operation arm 21 center mascot b fulcrum

Continued on front page (72) Inventor Kazuo Aoki 64 Ishizu-Kitamachi, Sakai City, Osaka, Japan Kubota Sakai Works, Ltd. 72) Inventor Tsuyoshi Inoue 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture F-term in Kubota Sakai Works (reference) 3D030 DH21

Claims (3)

[Claims] An operation arm for ground operation is provided at a front portion of a traveling body so as to be switchable between a retracted posture toward a traveling body side and an operating posture protruding forward, and a sight indicating a left and right center of the traveling body. A riding work machine comprising a center mascot as a tool, which is provided on the operation arm so as to be rotatable up and down. 2. The center mascot can be raised and lowered and rotated so that the center mascot projects above the upper end of the operation arm and the center mascot does not project above the upper end of the operation arm. The riding work machine according to claim 1 provided in the operation arm. 3. The riding work machine according to claim 1, wherein the center mascot is provided at a fulcrum below an upper end of the operation arm so as to be able to move up and down.