JP2000127983A - Riding work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform machine body maneuvering operation from aboveground by checking/preventing steering actuation of a front wheel by interlocking with this when an operation arm for aboveground maneuvering is switched to an action attitude projecting to the front of a machine body. SOLUTION: A rod 31 is extended backward from a connecting metal fitting 16c provided close to a fulcrum of an operation arm 16. When the operation arm 16 is brought down forward, the upward extending part end 46a of a torsion spring 34 is pressed forward and moved according to a forward movement of the rod 31. Thus, the whole torsion spring 46 rotates around a support shaft 43, and an operation checking member 42 locked with the downward extending end 46b rotates in the counterclockwise direction around the axis (c), so that the downward extending end 46b moves backward. The engaging action part 42a arranged in the lower end part of the operation checking member 42 elastically engages with and acts on a projection 45 of a pitman arm 44 from the front, so that the pitman arm 44 is stably held in a rectilinearly advancing position to check/prevent a front wheel from being freely operated by a recess/ projection of a road surface.

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 seeder.

[0002]

2. Description of the Related Art In a riding rice transplanter, when the machine is taken in and out of a field or unloaded on a truck bed or the like, the machine body may be largely tilted back and forth. It is desirable to get off the ground and steer. As means for responding to such a demand, for example, Japanese Patent Application Laid-Open No. 7-96839 or Japanese Patent Application Laid-Open No. 7-96840.
As disclosed in Japanese Unexamined Patent Application Publication No. H11-163, an auxiliary handle lever is attached to a pitman arm that steers the front wheels, and a worker standing on the ground swings the auxiliary handle lever at the front part of the fuselage, so that the pitman arm is Means for forcibly operating have been proposed.

[0003]

According to the above-mentioned proposed means, the operator can operate the aircraft from the ground to take the aircraft in and out of the field and to load and unload the aircraft on the truck bed. The auxiliary handle lever will rotate left and right integrally with the pitman arm, so that during normal work traveling while riding on the aircraft, this auxiliary handle lever can be detached so that it can be detached from the pitman arm It had to be configured.

However, in a rice transplanter performing paddy work, mud naturally adheres easily to the pitman arm located at the lower part of the front of the machine body, and the mud adheres to the auxiliary handle lever connecting portion provided on the pitman arm. When attached
There is a possibility that attaching and detaching the auxiliary handle lever may be difficult,
There was a problem in practical use.

[0005] Further, since the riding rice transplanter uses the rear wheels as main propulsion wheels, when traveling uphill on forward travel, the front part of the fuselage tends to float due to the propulsion reaction force, and the contact pressure of the front wheels decreases, thereby propelling the front wheels. In such a case, the worker on the ground pushes down the front of the aircraft to suppress the lifting of the front of the aircraft, but the conventional auxiliary handle lever is connected to the pitman arm. Therefore, if an operation of pushing down the front of the fuselage with the force applied to the auxiliary handle lever is performed, the pitman arm may be deformed or damaged.

The present invention has been made in view of such a point, and an object of the present invention is to provide a riding work machine capable of easily performing a body operation operation from the ground.

[0007]

Means for Solving the Problems [Structure, operation and effect of the invention according to claim 1]

(Structure) In the riding work machine according to the first aspect of the present invention, an operation arm for ground operation is provided at a front portion of the traveling body.
A steering control mechanism that is switchable between a retracted position toward the fuselage side and an operating position protruding forward from the fuselage, and interlocks this operating arm with the operating position to prevent the front wheels from being steered. It is characterized by having.

(Operation) According to the above configuration, the traveling body is driven at low speed by itself, the operation arm at the front of the body is switched to the operation posture protruding forward, and the operation arm is pressed down from the ground to operate the front part of the body. While lifting the aircraft, or swinging the operation arm to the left or right to slightly correct the aircraft's direction, cross the ridges and load / unload the aircraft from / to the vehicle. In this case, by switching the operation arm to the action posture protruding forward, a state where the steering operation of the front wheels is restrained is brought about, and the front wheels fall into irregularities on the traveling road surface and are self-reliant due to reaction force due to climbing up. The steering in the direction is avoided beforehand.

(Effects) Therefore, according to the first aspect of the present invention, when the operation arm is operated from the ground with the operating posture, there is a possibility that the traveling body may move in an unexpected direction depending on the road surface condition. This makes it possible to safely and securely cross over the ridges and load and unload the vehicle to and from the vehicle.

[Structure, operation and effect of the invention according to claim 2]

(Structure) According to a second aspect of the present invention, in the riding work machine according to the first aspect of the present invention, the steering restraint mechanism is configured to impart resistance to the steering operation by holding the front wheels in a straight running state. It is composed.

(Operation) According to the above configuration, the operation arm at the front of the fuselage is switched to the operation posture protruding forward, and the operation arm is operated from the ground to move over the ridge or to load / unload the vehicle to / from the vehicle. , The front wheels are always kept straight. Here, since the front wheels are not completely fixed in the straight running state, the steering arm applied to the front wheels is set to be smaller than the steering operation force from the steering handle, so that the operation arm is set to the working posture. Even if it is switched, the front wheels can be steered by the steering wheel.

(Effects) Therefore, according to the second aspect of the present invention, the ground control can be performed while easily recognizing the moving direction of the fuselage, and in the case of emergency, the steering of the fuselage is performed by operating the steering wheel. It is also possible to achieve the above-mentioned effect of the invention of claim 1 more reliably.

[Structure, operation and effect of the invention according to claim 3]

(Structure) According to a third aspect of the present invention, in the riding work machine according to the first or second aspect, when the front wheel is steered by a predetermined angle or more, the steering restraint mechanism is restrained. It is configured not to operate.

(Operation) According to the above configuration, even if the operating arm is switched to the operating posture while the front wheels are largely steered, the steering and restraining function of the front wheels by the steering and restraining mechanism is not exhibited. The front wheels cannot be fixed. Therefore, if the vehicle is driven unmanned in such a state, the front wheels become unstable and the moving direction of the aircraft is not stable, so that it is easy to recognize that the vehicle is not suitable for ground control. In such a case, after returning the front wheels to a state close to straight traveling, the operation arm may be switched to the operating posture again.

(Effect) Therefore, according to the third aspect of the present invention, it is effective to prevent ground steering by switching the operation arm to the operating posture while the front wheels are largely steered. Becomes

[Structure, operation and effect of the invention according to claim 4]

(Structure) According to a fourth aspect of the present invention, there is provided a riding work machine according to any one of the first to third aspects, wherein the operation arm has a standing storage posture and a forwardly protruding body. It is configured to be able to swing up and down over the posture, and to be able to adjust the forward tilt angle of the operating arm on which the steering restraint mechanism operates to restrain.

(Operation) According to the above configuration, the operation arm whose posture is switched in an oscillating manner is not always used in the operation posture having a constant inclination angle, but is adjusted according to the inclination angle at the time of use. The timing at which the steering restraint mechanism performs the restraint operation can be adjusted.

(Effects) Therefore, according to the invention of claim 4, the steering restraint mechanism can function properly regardless of the operating posture of the operation arm at any inclination angle. The effects of the inventions of the items 1 to 3 are obtained, and the handleability is excellent.

[Structure, operation and effect of the invention according to claim 5]

(Structure) According to a fifth aspect of the present invention, there is provided the riding work machine according to any one of the first to fourth aspects, wherein the interlocking of the operation arm and the steering restraint mechanism can be intermittently performed. It is composed.

(Operation) According to the above configuration, even when the operation arm is switched to the operation posture, it is possible to bring about a state in which the steering and restraining mechanism does not function, and even when maneuvering from the ground, It is also possible to operate the steering wheel to steer the front wheels and freely change the orientation of the aircraft.

(Effects) Therefore, according to the invention of claim 5, it is possible to obtain a state in which the front wheels can be steered as required even when the operation arm is switched to the operating posture, and If the front wheel steering is urgently required even when the vehicle is steered from the front, it is possible to perform the front wheel steering without returning the operation arm to the stowed posture, thereby further improving the handleability.

[Structure, operation and effect of the invention according to claim 6]

(Structure) According to a sixth aspect of the present invention, there is provided the riding work machine according to the fifth aspect of the present invention, further comprising means for detecting a work condition, and the operating arm and the steering restraint mechanism based on the detection result. It is configured to intermittently link with.

(Operation) According to the above configuration, for example, during normal work traveling or traveling on a road, the aircraft traveling speed is selected to be a high speed that is not suitable for crossing a ridge or loading / unloading a vehicle. When such a driving situation is detected,
It can be set so that the interlock between the operation arm and the steering restraint mechanism is automatically cut off. According to such a setting, the front wheels can be freely steered regardless of the posture of the operation arm. Further, in a model equipped with a work clutch, it is possible to set that the interlock between the operation arm and the steering restraint mechanism is cut off by detecting that the work clutch is engaged. According to the setting, even if the operation arm is inadvertently switched to the operating posture during the work traveling, the state where the front wheels can be freely steered is maintained.

(Effects) Therefore, according to the invention of claim 6, when the vehicle is in a working condition that is not over a ridge or loading / unloading to / from a vehicle, the steering restraint mechanism does not automatically operate, and a desired front wheel steering operation is performed. Direction, and only when the conditions for crossing ridges and loading / unloading vehicles are met,
The steering check mechanism operates in conjunction with the switching operation of the operating arm, and it is now possible to safely cross over ridges and load / unload vehicles without the front wheels being inadvertently steered.

[Structure, operation and effect of the invention according to claim 7]

(Structure) According to a seventh aspect of the present invention, there is provided a riding work machine according to any one of the first to sixth aspects, further comprising a means for detecting a work condition, and The switching of the operation arm to the operation posture is prevented from being restrained.

(Operation) According to the above configuration, for example, during normal work traveling or traveling on a road, the aircraft traveling speed is selected to be a high speed that is not suitable for crossing a ridge or loading / unloading a vehicle. When such a driving situation is detected,
The operation arm can be set so that it cannot be switched to the operation posture. Further, in a model provided with a work clutch, it is possible to set such that it is impossible to switch the operation arm to the operating posture by detecting that the work clutch is in the engaged state. According to this, unless the airframe traveling speed and work clutch are prepared to be suitable for crossing ridges and loading / unloading vehicles, it is possible to obtain a state where the operation arm can be switched to the working posture and control from the ground is possible. It will not be possible.

(Effects) Therefore, according to the invention of claim 7, if the operation arm cannot be operated when it is attempted to switch to the operation posture, the operation arm is prepared in a state suitable for crossing a ridge or loading / unloading a vehicle. It can be easily recognized that there is no operation, and ground control using the operation arm can be performed only in a state where proper preparation has been performed, so that operability is further improved.

[Structure, operation and effect of the invention according to claim 8]

(Structure) According to an eighth aspect of the present invention, there is provided a riding work machine according to any one of the first to seventh aspects, in which the operating arm is operated in conjunction with switching of the operating arm to the operating posture. The speed increasing operation is configured to prevent a check.

(Operation) According to the above configuration, for example, when operating the vehicle from the ground by switching the operation arm to the operation posture at a low speed suitable for moving over the ridge and loading / unloading the vehicle, Even if an external force in the speed increasing direction is accidentally applied to the speed change lever for traveling, the speed increasing operation is prevented from being restrained.

(Effects) Therefore, according to the seventh aspect of the present invention, during operation from the ground while the operation arm is switched to the operation posture, it is possible to operate safely without increasing the vehicle running speed. .

[Structure, operation and effect of the invention according to claim 9]

(Structure) According to a ninth aspect of the present invention, in the riding work machine according to any one of the first to eighth aspects, the steering and restraining mechanism is operated by a pitman arm for steering a front wheel. It is configured to check.

(Operation / Effect) According to the above configuration, the pitman arm for steering the front wheels is often provided at the front part of the fuselage, so that the operation arm and the pitman arm provided near the front end of the fuselage are relatively easy to approach. As a result, the steering restraint mechanism provided over the pitman arm and the operation arm can be reduced in size.

[0042]

FIG. 1 shows a riding rice transplanter as an example of a riding work machine according to the present invention. This riding rice transplanter has a steerable front wheel 1 and a rear wheel 2 as a main propulsion wheel.
A seedling planting device 5 is connected to a rear portion of a four-wheel drive type traveling body 3 having a hydraulically driven link mechanism 4 so as to be able to move up and down. Engine 6 mounted on the front of traveling body 3 and transmission case 7 supporting front wheels 1
The front wheels 1 are driven by the gears and forward / reverse switching power in the transmission case 7, and the traveling speed power taken out of the transmission case 7 is transmitted to the rear transmission. The shaft is transmitted to the case 9, the rear wheel 2 is driven at a speed synchronized with the front wheel 1, and the working power taken from the rear of the transmission case 7 is transmitted to the seedling planting device 5 by shaft. ing.

As shown in FIGS. 2 to 4, an engine bonnet 1 containing the engine 6 is provided at a front portion of the traveling body 3.
0, a stand 11 for spare seedlings is erected on the left and right sides, and the engine bonnet 10
An entry / exit passage 12 for allowing walking movement between the front end of the fuselage and the driving section is formed between the vehicle and the spare seedling rest 11.

A front frame 13 for mounting a battery is provided below the front end of the traveling machine body 3, and a front portion of a guard frame 14 provided so as to surround the left and right sides from the front of the front frame 13 is a pipe. The traction frame 15 is formed by bending a material into a U shape. On the left and right outer sides of the guard frame 14, an operation arm 1 for ground operation is provided.
Reference numeral 6 is attached so as to be able to swing up and down around a horizontal fulcrum a. The operation arm 16 bends a round pipe material into an arch shape extending downward, and a middle portion thereof is a stay 16a.
And has a width that fits within the lateral width of the engine bonnet 10 so as not to hinder the walking movement in the getting-in / off passage 12, and the operating arm 16 is vertically erected. The upper end of the driver seat 17
It is configured to be located at a height at which a worker sitting on the vehicle can be visually confirmed through the engine hood 10. Also,
The left and right base ends of the operation arm 16 are pivotally connected to the left and right sides of the front frame 14 by bolts 18 so as to be able to undulate and swing, and the disc spring 19 provided at one of the bolt connection points is tightened to operate. Appropriate frictional resistance is given to the up-and-down swing of the arm 16, so that the up-and-down operation can be manually performed arbitrarily and the upright posture can be maintained by friction.

A stopper 20 is welded and fixed to the left and right outer sides of the front frame 14. The base of the operation arm 16 contacts the front end of the stopper 20 as shown in FIG. The rising limit of the operating arm 16 is restricted, and as shown in FIG.
The base extension of 8 abuts against the lower surface of the stopper 20, so that the falling limit forward of the operation arm 16 is regulated. Then, the operation arm 16 that has been raised up to the limit has a substantially vertical storage posture, and the operation arm 16 in the operation posture that has fallen down to the limit has a slightly upwardly inclined state.

The distal end of the operating arm 16 is formed with a lateral grip portion 16b having an appropriate width enough to be able to be gripped sideways so that the operating arm 16 in the lying action posture can be easily pushed down and pulled forward. Have been. Also,
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 center of the fuselage is provided so as to be able to move up and down around a fulcrum b. A nameplate 22 displaying a commercial nickname of the printer, a model name of the apparatus, and the like is affixed.

The operation arm 16 can be manually arbitrarily raised and lowered. In order to assist the relatively heavy operation arm 16 in raising and lowering, the following upright urging mechanism 30 is provided. Is provided. That is, as shown in FIG. 6 and FIG. 7, the rod 31 extends rearward from the link fitting 16 c provided near the left fulcrum of the operation arm 16, and the rod 31 is provided on the left side of the front frame 14. The coil spring 34 projects between the fixed bracket 32 and the spring receiving washer 33 provided at the distal end of the rod 31.
The rod 31 is pulled out forward as the operation arm 16 is tilted forward and downward from the standing posture, and the coil spring 34 is compressed and deformed. The elastic restoring force of the coil spring 34 causes the operation arm 16 to stand in the upright direction. Is to be energized.

Here, in a range where the operation arm 16 is slightly swung forward from the vertical standing limit position, the coil spring 3
The frictional resistance at the fulcrum a is set to be larger than the upright urging force by 4, and the operating arm 16 can be held at an arbitrary upright angle in this swing range. That is, the position of the center mascot 21 can be adjusted forward and backward within a certain range and held, and the center mascot 21 can be set and used at a position that is easy for the driver to see. In a state where the operation arm 16 is largely lowered forward, the coil spring 3
Since the upright urging force by 4 is larger than the frictional resistance at the fulcrum a, when the operation arm 16 is released, it automatically returns to a position where it stands up to a certain extent.

The assembly of the rod 31 and the coil spring 34 is performed as follows. That is, first, FIG.
As shown in (b), the spring receiving washer 33 and the coil spring 34 are attached to the rod 31 before assembly, and the coil spring 34 received by the spring receiving washer 33 is compressed using a jig or the like, and the rod 31 is fixed. A temporary fixing pin 36 is inserted into a pin hole 35 formed in advance in the middle, so that the compressed coil spring 34 is prevented from restoring. Next, the rod 31 on which the coil spring 34 is compressed is mounted on the fixed bracket 3.
2 is inserted from the side into a rod insertion hole 37 formed by cutting out horizontally, and the front end of the rod 31 is pivotally connected to the lower end of the operation arm 16 previously mounted on the fulcrum a. Next, the operation arm 16 is largely lowered forward around the fulcrum a,
The rod 31 is pulled out to the position shown in FIG. As a result, the temporary fixing pin 36 that has received the front end of the coil spring 34 that has been compressed in
Through the rod insertion hole 37. At this time, the coil spring 34 is received by the fixing bracket 32 and further compressed and deformed, whereas the temporary fixing pin 36 is released from the coil spring 34 and is exposed in front of the fixing bracket 32, and the reaction force of the coil spring 34 The temporary fixing pin 36 in a free state that is not affected by the rod 31 can be easily pulled out from the rod 31, whereby the assembly of the rod 31 and the coil spring 34 is completed.

Also, near the base of the operation arm 16, a steering restraint mechanism 40 for restricting the steering of the front wheel 1 when the operation arm 16 is lowered forward is constructed and arranged as follows. I have. That is, as shown in FIGS. 6 and 7, 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 so as to be rotatable around the horizontal axis c. In addition, a projection 45 on which the steering restraint member 42 is engaged is provided on the upper surface of the pitman arm 44 for steering the front wheels provided on the transmission case 7. The upper extension end 46a of the torsion spring 46 externally fitted to the support shaft 43 is wound around the rear end of the rod 31 and is prevented from coming off by a pin 47. Lower extension end 46
b is locked and connected to the steering restraint member 42, and the upwardly extending end 46 a of the torsion spring 34 is pressed forward by the forward movement of the rod 31, whereby the torsion spring 46 is moved.
The entirety rotates around the support shaft 43, and the lower extension end 46b moves rearward, so that the steering restraint member 42 locked to the lower extension end 46b rotates around the axis c in the counterclockwise direction in the figure. Is rotated in the direction, the engaging action portion 42a provided at the lower end portion of the steering restraint member 42 elastically engages with the projection 45 of the pitman arm 44 from the front, and the forward movement amount of the rod 31 increases. As a result, the amount of torsional deformation of the torsion spring 46 increases, and the engagement pressing action of the engagement action portion 42a on the projection 45 increases.

As shown in FIG. 7 (a), the projection 45 is formed in a chevron shape directed forward, and the engaging action portion 42a of the steering restraint member 42 is a V-shaped open rearward. Pitman arm 44
The V-shaped engaging action portion 42a is pressed and engaged with the chevron 45, so that the pitman arm 44 is corrected to the straight-ahead position and is stabilized at that position even if is steered to the right or left from the straight-ahead position. Good engagement and retention. Therefore, the operation arm 1
6 greatly falls forward, the pitman arm 44
Is stably held in 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.

However, the engaging action portion 4 of the steering restraint member 42
2a is elastically engaged with the projection 45 of the pitman arm 44. Therefore, if the steering handle 23 of the driver is forcibly rotated, the projection 45 causes the steering restraint member 42 to resist the torsion spring 46. The pitman arm 44 can be steered so that the pitman arm 44 moves over the engaging action portion 42a while pushing forward. That is, when the operation arm 16 is operated to fall down and the steering restraint mechanism 40 is in the operating state, the front wheel 1 is not steered without permission due to unevenness of the road surface, but another operator can forcibly turn the steering handle 23. For example, the front wheels 1 can be steered.

The operation arm 16 and the steering restraint mechanism 40
The pin 47 mounted on the tip of the rod 31 for receiving the upper extending end 46a of the torsion spring 46 can change its mounting position. The tilt angle of the operation arm 16 when the direction restraining mechanism 40 starts the restraining operation can be adjusted.

As shown in FIG. 10, the belt transmission device 8 comprises two sets of output pulleys 51a, 51b and input pulleys having different transmission ratios on the output shaft 6a of the engine 6 and the input shaft 7a of the transmission case 7, respectively. The belts 53a and 53b are wound around the respective belts 53a and 52b.
a, 53b acting on the tension rollers 54a, 54b
, A so-called double-tension type shift function configured to perform a two-step “high” or “low” shift by selectively operating any of the tension rollers 54.
tension arms 55a, 55b provided with a, 54b
Is the auxiliary transmission lever 2 disposed on the left side of the driver's seat 17
4 are linked via two sets of link mechanisms 56a and 56b. In addition, the main gear transmission in the transmission case 7 is shifted to three speeds, so that "high speed" for traveling and traveling is performed.
A main transmission lever 25 for selecting between "low speed" for planting and "ultra low speed" for crossing ridges and loading / unloading a vehicle is provided at the center front portion of the driving unit step 26 so as to be capable of lateral movement operation. In addition, the shuttle lever 27 for performing forward and backward selection by performing a gear shift in the transmission case 7 by swinging back and forth is operated by the steering handle 23.
It is deployed on the left side of.

Here, the two sets of tension rollers 54a and 54b for performing a two-step speed change are configured to also function as the main clutch 57. That is, the contact portion 59 is provided on the pedal arm 58a of the main clutch pedal 58 provided on the left front portion of the driving section step 26,
Both tension arms 55 in the belt transmission 8
The base end extension portions of a and 55b are provided opposite to the contact portion 59, and when the main clutch pedal 58 is depressed, both tension arms 55a and 55b are both operated to the "clutch disengagement" side. A so-called tension clutch-type main clutch 57 that cuts off transmission from the engine 6 to the transmission case 7 is configured. In addition, a brake 60 that brakes the input shaft 7a of the transmission case 7 to stop the machine body is provided on the lower transmission side of the main clutch 57.

As shown in FIGS. 11 and 12, a fulcrum shaft 61 which loosely supports the main clutch pedal arm 58a.
A stop lever 62 for simultaneously operating the main clutch 57 and the brake 60, and a brake arm 63 are each loosely supported and extend forward, and the main clutch pedal arm 58a and the stop lever 62 are The torsional springs 64 and 65 respectively urge upward to return. A main clutch pedal arm 58a, a stop lever 62, and a washer 66 for preventing the brake arm 63 from coming off are attached to the distal end of the fulcrum shaft 61 via bolts 67, as shown in FIG. The extended end of the washer 66 is non-rotatably engaged with a horizontal frame 68 constituting the body frame, and a part of the washer 66 is
The head 67 is bent so as to engage with the head uneven surface, so that the bolt 67 is prevented from rotating.

The stop lever 62 is disposed so as to cross the main clutch pedal arm 58a from above.
When the stop lever 62 is pivoted downward, the main clutch pedal arm 58a is pushed down by a one-sided contact of the stop lever 62 to disengage the main clutch 57 and stop when the main clutch pedal 58 is depressed. The lever 62 is left at the return position. The stop lever 62 is provided close to the left side of the engine hood 10 so as not to hinder the walking movement in the getting-in / off passage 12. Here, the left and right side surfaces of the engine bonnet 10 are formed as curved surfaces that are three-dimensionally convex outward, and the stop lever 62 extends forward from the convex top of the bonnet side surface. Even if the lever main body is arranged close to the side of the bonnet, the lever grip 62a can be arranged away from the side of the bonnet so that it can be easily gripped.

Further, at the tip of the brake arm 63, the input pulley 52a,
A brake pad 70 acting on a belt winding groove of the outer pulley 52a of the pulley 52b is provided, and a stop lever 62 and a brake arm 63 are interlocked and connected via a rod 72 with a compression coil spring 71 fitted externally. The brake 60 is configured so that the brake arm 63 is also operated downward as the stop lever 62 is depressed to operate the main clutch 57 and the input pulley 52a is braked. Here, the stop lever 62
Is operated, the operation timing of the main clutch 57 and the brake 60 is set so that the brake 60 starts working before the main clutch 57 is completely disengaged.

As shown in FIG. 13, even at the brake release position where the brake arm 63 has returned, the brake pad 70 is slightly engaged in the groove of the input pulley 52a, and the brake arm 63 is moved slightly. Even
During the braking operation, the brake pad 70 is properly pressed into the groove of the input pulley 52a. Further, by adjusting the mounting position of the pin 73 provided at the lower end of the rod 72, the reference position of the brake arm 63 at the brake release position can be adjusted, and the timing at which the brake starts to work can be adjusted. Further, by adjusting the position of the spring receiving pin 74 mounted on the upper part of the rod 72, the initial compression state of the compression coil spring 71 can be adjusted, whereby the brake pad 70 is applied to the input pulley 52a during the braking operation. The pressing force can be adjusted.

As shown in FIGS. 11 and 12,
A locking lever 75 that engages with the latch 58b of the depressed main clutch pedal 58 is provided in the left entry / exit passage 12.
The main clutch pedal 58, which is swingable back and forth around the fulcrum d and is urged forward, is locked and held by the locking lever 75 so that the main clutch disengaged state can be maintained. Has become.

The stop lever 6 of the locking lever 75
A locking pin 76 with a head is provided on the two side surfaces.
Although the locking pin 76 with the head is out of the swing operation path of the stop lever 62, as shown by phantom lines in FIG. 11B and FIG. The stop lever 62 that has been swung to the brake operating state) is forcibly elastically deformed toward the locking lever 75 and locked to the locking pin 76 with the head from below, so that the stop lever 54 is moved to the stop position. It is possible to keep it.

Further, an upper portion of the stop lever 62 is provided with a stepped portion 62a which is overlapped from the rear at the right end of the main clutch pedal 58 so as to be seated on the driver's seat 17 as described above. When the stepping portion 62a of the stop lever 62 locked and held at the stop position by the headed locking pin 76 is depressed to swing the stop lever 62 further downward, the stop coming off the headed locking pin 76 is stopped. The lever 62 elastically returns to the original lateral position. When the depression of the step portion 62a is released in this state, the stop lever 62 is moved to the initial position without interfering with the locking pin 76 with the head (the main clutch is engaged and the brake is released). ), The main clutch pedal 58 also returns to the clutch engaged position.

The getting on / off passage 12 beside the engine hood 10
The preliminary seedling rest 11 arranged outside the erection stands upright on an arch-shaped support 80 on a support 81 fixed to the fuselage side, and the support 80 has a plurality of stages of seedling rest 82 facing outward. It is configured to be cantilevered, and the entire seedling rest 11 is rotated about 180 degrees rearward about the longitudinal axis e of the support 80 on the side of the rear support 80b, so that the seedling is placed. The spare seedling rest 11 can be stored in a state in which the plate 82 is prevented from protruding laterally outward of the machine, which is convenient when the machine is loaded on a vehicle or stored in a garage. In particular, when the spare seedling rest 13 on the left side is rotated and retracted rearward, the periphery of the stop lever 62 is widely vacant, and the lever operation becomes easy when the ground operation is performed using the operation arm 16 as described above.

The support 80 of the stand 11 for the spare seedlings
The vertical axis e, which is the axis of rotation, is set vertically, whereas the normal use posture is inclined by a small angle (for example, several degrees) to the inside of the fuselage. Stand 1
1 is about 18 around the longitudinal axis e of the rear support 80b.
When it is rotated backward by 0 degrees, the column 80 is inclined to the outside of the fuselage. As a result, the seedling resting plate 82 of the spare seedling rest 13 that has been rotated rearward enters the inside of the machine greatly,
Interference with the shuttle lever 27 and the like is avoided.

A mat-shaped seedling placed on and supported by a seedling rake plate 83 is placed and accommodated in the seedling resting plate 82 of the spare seedling rest 11, and the spare seedling is supplied to the seedling planting apparatus 5 and remains. Place the used seedling rake plate 83 on the top seedling plate 82
It is configured to be kept on top. That is, on the upper part of the column 80, a holding rod 84 formed in an arch shape is inserted and erected around the fulcrum f around the column so as to be rotatable up and down, and the holding rod 84 and the rear column 80b are connected to each other. A toggle spring 85 is mounted over the
As shown in FIG. 7, the non-operation position in which the presser rod 84 is swung upward and the operation position in which the press rod 84 is placed on the seedling placing plate 82 can be switched and held beyond the dead point DP. Therefore, when the spare seedlings are fully loaded, the holding rod 84 is switched to the non-operation position in which the holding rod 84 is swung upward and held, and when the seedlings are replenished and the top-most seedling resting plate 82 becomes empty, this seedling resting plate is opened. The used seedling rake plate 83 is placed on the reference numeral 82, and as shown by the phantom line in FIG. 19, the used seedling rake plate 83 is elastically pressed and held by the holding rod 84 switched to the working posture, and the used seedling rake plate 83 is held. The seedling rake plate 83 is collected and stored so as not to be blown off by wind or the like.

As shown in FIG. 15, the rear support 80b of the spare seedling rest 11 is rotatably fitted to the rear support shaft 86 erected on the support 81 so as to be rotatable around the vertical axis e. While being supported by the set bolt 87, the lower end of the front support column 80 a is connected to the upper end of the front support shaft 88 erected and fixed to the support base 81 in a state where the lower end of the front support shaft 88 abuts and opposes. That is, as shown in FIGS. 16 and 17, a positioning bracket 89 having a U-shaped cross section opened toward the inside of the fuselage is provided at the lower end of the front column 80 a so as to protrude downward. The front support shaft 88 and the front support column 8 are fitted by fitting the front support shaft 89 to the front support shaft 88 from the lateral outside.
0a is concentrically positioned and abutted up and down.

A horizontal support shaft 90 is provided below the front support column 80a so as to be slidable in the horizontal direction.
The latch 91 is loosely fitted to the protruding end inside the fuselage 0, and the latch 91 is urged together with the spindle 90 toward the front spindle 88 by a spring 92 which is externally fitted to the spindle 90. . A lever 93 is connected to the latch 91, and a positioning bracket 89 is fitted to the front support shaft 88 from the lateral outer side to position the front support shaft 88 and the front support column 80a concentrically. 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 to prevent the front support column 80a from being laterally and outwardly detached from the front support shaft 88. A locking groove 94 is formed in an annular shape on the outer peripheral surface of the front support shaft 88, and a locking pin 95 is protruded from the inner surface of the positioning bracket 89 so that the front support 80 a is connected to the front support 80 a. Axis 88
In the state where the front supports 80a are butt-connected, the locking pins 95 are engaged with the locking grooves 94 so that the front support columns 80a do not come off with respect to the front support shafts 88.

Also, the lever 93 is swung forward to remove the latch 91 from the front support shaft 88, thereby rotating the entire spare seedling rest 11 rearward around the rear vertical axis e. be able to.

The rear support shaft 86 is provided with a seedling marker 100 which is used when the aircraft is moved along the row of seedlings previously planted. The seedling marker 100 connects a marker arm 102 to a bracket 101 fixed to a rear support shaft 86 so as to be swingable about a vertical fulcrum g, and attaches a marker rod 103 attached to the tip of the marker arm 102 to a rubber rod. The marker cap 103 is slid up and down to an arbitrary height by friction resistance of a penetrating portion with the rubber cap 104 so that the position can be held. .

As shown in FIG. 18, the bracket 101 is provided with a locking member 105 made of a spring plate in a cantilever shape, and the stand 11 for the spare seedlings is moved backward by about 18 degrees.
When it is turned by 0 degree, the vertical pin 106 fixed near the lower end of the rear support 80b is elastically engaged with the locking fitting 105, and the spare seedling rest 11 is held in the backward turning state. ing.

The riding rice transplanter according to the present invention is constructed as described above. When a worker works on a driver's seat 17 during a normal operation, the operation is performed as shown in FIGS. The arm 16 is switched to the upright posture and held, and the center mascot 21 is upright. In this case, the main clutch pedal 58 is depressed and the main clutch 5
Since the stop lever 62 remains even when the switch 7 is turned off, the brake 60 is not braked.

When the traveling machine 3 is inclined forward and backward, such as when the rice transplanter moves over a ridge for putting the rice transplanter into and out of the field, or when loading and unloading the rice transplanter on a carrier such as a truck, it is difficult to carry on board. Selects the main transmission lever 25 to "ultra low speed" and sets the sub transmission lever 24 to "low speed".
, And the engine output is set appropriately high by operating the accelerator, and the worker descends on the ground and steers while self-propelling the passenger traveling vehicle body 3 in a state where it can travel at a very high speed with a high torque. In this case, the front arm 1 is set in the straight traveling state, and the operation arm 16 is switched to the operation posture in which the operation arm 16 largely projects forward.

For example, as shown in FIG. 20, when the vehicle travels forward with an upward inclination, the front part of the passenger traveling machine body 3 may be slightly lifted by the propulsion reaction force. By applying a downward load to the front part of the body by pressing down on the front part, the lifting of the front part of the body can be suppressed. When the road surface is bad and it is difficult to climb, the operation arm 18 can be pulled forward to assist climbing. In addition, the direction of the machine body can be forcibly corrected by pushing and pulling the operation arm 16 right and left as necessary. In such an operation, the front wheels 1 are stably held in the straight traveling direction by the traveling restraint mechanism 40, and the front wheels 1 are not automatically steered due to unevenness of the road surface, and the aircraft does not move in an unexpected direction. .

In order to stop the aircraft during operation from the ground, if the stop lever 62 is pressed down, the main clutch 57 is disengaged, and the brake 60 is braked to immediately stop the aircraft. In this case, since the brake 60 works first, only the main clutch 57 is disengaged first, and the freed aircraft does not slip down.

When it is desired to maintain the stopped state of the machine, the stop lever 62 at the stop position may be slightly displaced laterally and locked and held by the locking pin 76 of the locking lever 75 with the head. The release of the stop lever 62 from the stop position can be manually released from the headed locking pin 76 or
What is necessary is just to step on the stepping part 62a once from the driver seat 17, and to return.

[Other Embodiments] The present invention can also be carried out in the following modes.

As shown in FIG. 21, the operation arm 16
At the tip of the rod 31 which links the steering control mechanism 40 with
By mounting a nut 108 with a washer for receiving the upper extension end 46a of the torsion spring 46, the nut 108
By adjusting the position, the tilt angle of the operation arm 16 when the steering and restraining mechanism 40 starts the restraining operation can be continuously adjusted. Further, if the nut 108 is largely displaced rearward, it is possible to bring about a state in which the steering and restraining mechanism 40 does not function even if the operation arm 16 is tilted to the limit.

As shown in FIG. 22, a stopper 109 for preventing the steering restraint member 42 from swinging from the retracted position to the towing position can be moved back and forth in the front and rear directions of the paper by an actuator 110 such as a solenoid. And the actuator 110 is connected to the control device 11.
1 and the stopper 109 may be controlled to move in and out as follows depending on the working conditions. That is, the control device 111 includes a main shift sensor S1 for detecting whether or not the main shift lever 25 is at the "ultra low speed"position;
An auxiliary transmission sensor S2 for detecting whether or not the engine 4 is at the "low speed"position; and a planting lever disposed on the right side of the driver's seat 17 for controlling the raising and lowering of the planting device 5 and the transmission of power to the planting device 5. A planting sensor S3 for detecting whether 112 is in the "planting" position, a seat sensor S4 for detecting seating on the driver's seat 17, and whether the left spare seedling rest 11 is rotated backward. Spare seedling stand sensor S5
Are connected, 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,
It is recognized that the operator is not seated on the vehicle and the stand 11 for the spare seedlings is rotated rearward, that is, the conditions suitable for crossing the ridges and moving the vehicle in and out are satisfied. Then, the stopper 109 is controlled to retreat, and the steering and restraining member 42 can be rocked, so that the steering and restraining mechanism 40 functions.

Further, the above condition is not satisfied in a normal planting operation state or a traveling traveling state on a road, so that even if the stopper 109 is controlled to protrude and the operation arm 16 is lowered to the working posture, the twisting is not performed. Only the spring 46 is torsionally deformed so that the swinging movement of the steering restraint member 42 is prevented from contacting,
Thus, a state where the steering restraint mechanism 40 does not function is brought about.

Further, the control device 111 is connected with a check release switch SW for releasing the steering and restraining function of the steering and restraining mechanism 40 by projecting the stopper 109 so that the operation arm 16 is in the operating posture. Even if it is switched, it is possible to arbitrarily appear a restraint release state in which the steering restraint mechanism 40 is not operated.

As shown in FIG. 23, the stopper 113 for preventing the operation arm 16 from swinging from the standing posture to the operating posture is connected to the actuator 1 such as a solenoid.
14, the actuator 114 may be connected to the control device 111, and the stopper 113 may be controlled to move in and out as follows depending on working conditions. That is, similarly to the previous example, the main shift sensor S1, the auxiliary shift sensor S2, the planting sensor S3, the seat sensor S4, and the spare seedling rest sensor S5 are connected to the control device 111. In the "super low speed" position, the auxiliary transmission lever 24 is in the "low speed" position, the planting lever 112 is not in the "planting" position, no operator is seated on the driver's seat 17, and the spare seedling rest 11 Is recognized to be in a state of being rotated backward, that is, the conditions suitable for moving over the ridge and moving the vehicle in and out are satisfied, the stopper 113 is controlled to retreat, and the operation arm 16 is controlled.
Is brought into a state in which the swinging of the switch to the action posture is permitted. In the normal planting operation state or the traveling traveling state on the road, the above condition is not satisfied, so that the stopper 113 is controlled to protrude, so that the operation arm 16 cannot fall down to the working posture.

When the operating arm 16 is lowered to the operating position in a state where the above conditions are satisfied, this is detected by a falling sensor S6 composed of a potentiometer, and the operation path of the main transmission lever 25 and the operation path of the auxiliary transmission lever 24 are detected. Are controlled by the actuators 117 and 118 such as solenoids to prevent the main shift lever 25 from shifting from the “ultra low speed” position to the speed increasing side (to the neutral position). (The shift is possible), and it is configured to prevent the sub-shift lever 24 from shifting from the “low speed” position to the high speed side.
It is also possible to prevent the user from inadvertently switching the traveling speed change from the extremely low speed state to the high speed side while moving over the ridges or loading / unloading the vehicle by maneuvering from the ground by operating the vehicle from the ground.

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

The operating arm 16 is not limited to an arm mounted on the front end portion of the fuselage so as to be able to swing up and down. For example, as shown in FIG. It is also possible to configure and implement a U-shaped one equipped so as to be able to slide in and out. 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 fuselage.

As the steering restraint mechanism 40 that operates when the operation arm 16 is switched to the operating posture, the front wheel 1
May be fixed or braked to the front wheel posture at the time when the operation arm 16 is switched to the operating posture.

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 operation arm 16 is switched to the operating attitude.

In addition to acting on the pitman arm 44, the steering restraint mechanism 40 may have a structure in which a 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 the front part of the fuselage.

FIG. 3 is a perspective view of a front part of the aircraft.

FIG. 4 is a plan view of a front part of the fuselage.

FIG. 5 is a side view of a front portion of the aircraft body in which an operation arm is switched to an operation posture.

FIG. 6A is a side view showing the base of the operation arm in the retracted position. FIG. 6B is a side view showing the base of the operation arm in the operation position.

FIG. 7A is a plan view showing the base of the operation arm in the retracted position.

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

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

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

11A is a side view showing a brake in a braking released state. FIG. 11B is a side view showing a brake in a braking state.

FIG. 12 is a plan view showing an operation unit 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 shaft end;

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

16 is a sectional view taken along line xx in FIG.

FIG. 17 is a cross-sectional plan view showing a front column fixing structure.

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

FIG. 19 is a vertical sectional front view of the upper portion of the reserve seedling rest.

FIG. 20 is a side view showing an example of a ground operation state.

FIG. 21 is a side view showing a modification of the steering restraint mechanism.

FIG. 22 is a configuration diagram showing another embodiment of the steering restraint mechanism.

FIG. 23 is a configuration diagram showing still another embodiment of the steering restraint mechanism;

FIG. 24 is a perspective view of a front portion of an airframe provided with an operation arm according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 3 Riding body 16 Operating arm 40 Steering restraint mechanism

Continued on the front page (72) Inventor Kazuo Aoki 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture, Kubota Sakai Works, Ltd. 72) Inventor Tsuyoshi Inoue 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture F-term in Kubota Sakai Works Co., Ltd. (Reference) 3D030 DB95 DH21 3D037 FA23 FB00

Claims (9)

[Claims] An operating arm for ground operation is provided at the front of a traveling body so as to be switchable between a retracted attitude toward the fuselage side and an operating attitude protruding forward from the aircraft, and an operating attitude of the operating arm. A riding work machine comprising a steering and restraining mechanism for preventing a steering operation of a front wheel from being restrained in conjunction with a switch to a steering wheel. 2. The riding work machine according to claim 1, wherein the steering restraint mechanism is configured to impart resistance to the steering operation by holding the front wheels in a straight running state. 3. The riding work machine according to claim 1, wherein the steering restraint mechanism is configured not to perform a restraint operation when the front wheels are steered by a predetermined angle or more. 4. The operating arm is configured to be able to swing up and down between an upright stowed posture and an operating posture protruding forward of the fuselage, and the forward tilt angle of the operating arm at which the steering restraint mechanism performs a restraint operation. The riding work machine according to any one of claims 1 to 3, wherein the riding work machine is configured to be adjustable. 5. The riding work machine according to claim 1, wherein the operation arm and the steering restraint mechanism are intermittently interlocked. 6. The riding work machine according to claim 5, further comprising means for detecting a working condition, wherein the operation of the operating arm and the steering restraint mechanism is intermittently connected based on the detection result. 7. The apparatus according to claim 1, further comprising: means for detecting a work condition, wherein switching of the operation arm to the operation posture is prevented from being restrained based on the detection result. Riding work machine. 8. The riding operation according to claim 1, wherein an operation for increasing the vehicle running speed is prevented from being restrained by interlocking with the switching of the operation arm to the operation posture. Machine. 9. The riding work machine according to claim 1, wherein the steering restraint mechanism is configured to restrain an operation of a pitman arm for steering a front wheel.