JPH0923706A - Handle locking device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accomplish higher safety through preventing machine body behavior from abrupt change tending to occur due to light handle operation in a working vehicle where a pair of left and right crawler-type traveling sections are mounted with left and right traveling hydraulic motors, respectively, left and right traveling hydraulic pumps are set up under the floor of the driving section, and there is equipped an operational section to change the revolution ratio for the hydraulic motors and steer/operate a speed change gear to be actuated through synchronizing the hydraulic motors. SOLUTION: A handle lock holding piece 160 is projected on a handle shaft by transversely setting up a handle lock shaft 162 in a freely revolvable way, a handle lock arm 173 is projected to the handle lock shaft 162, and the tip of the handle lock body 174 to make the collocated with a nearly U-shaped handle lock body 174 to make the handle lock holding piece 160 engageable with the handle lock body 174 through the revolving operation of the handle lock shaft 162.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handle lock device for a work vehicle.

[0002]

2. Description of the Related Art Conventionally, hydrostatic transmissions (hereinafter,
There is a work vehicle equipped with an HST), and steering is performed by changing the output rotational speed of the left and right HSTs by steering operation of the steering wheel and by changing the traveling drive speed of the left and right traveling devices.

[0003]

However, in the above work vehicle, since the operator only changes the gear ratio of the HST, the steering wheel operation is extremely light. Therefore, even a slight erroneous operation of the steering wheel causes the aircraft to make a sharp turn. For example, the behavior may change suddenly, which is dangerous.

In particular, when the work vehicle is loaded and unloaded on a truck or the like by using a step board or the like by self-propelled, the steering wheel operation is extremely light. There is a problem in that loading and unloading fails, such as when a person steps on a step board.

[0005]

According to the present invention, a pair of left and right crawler type traveling units are provided with left and right traveling hydraulic motors, respectively, and a left and right traveling hydraulic pump for driving each traveling hydraulic motor is provided on the floor of the operating unit. The steering wheel is installed at the lower part of the section to change the rotation ratio of the left and right traveling hydraulic motors for steering, and the gear shift lever synchronizes the left and right traveling hydraulic motors for steering to accelerate and decelerate. In a work vehicle in which an operation unit for gear shifting operation is provided on the floor, a handle lock locking piece is projected on the handle shaft, and a handle lock shaft linked to a handle lock operation lever is horizontally rotatably mounted. Then, a handle lock arm is projectingly provided on the handle lock shaft, and a substantially U-shaped handle lock body is continuously provided at the tip of the handle lock arm, so that the handle lock shaft can be rotated. A handle lock body can be disengaged / engaged with the handle lock engagement piece, and a fulcrum crossing mechanism for stopping the rotation of the handle lock shaft at either the lock position or the lock release position is provided on the handle lock shaft. The present invention provides a handlebar lock device for a work vehicle, which is provided with handlebar lock means for interlockingly connecting and holding the handlebar in a neutral position.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 is an agricultural tractor equipped with a handle lock device according to the present invention. The agricultural tractor A has three types of work machines such as a rotary tiller B in the rear. A point-link type lifting mechanism C is connected so that it can be moved up and down so that various work machines can be used for work.

As shown in FIGS. 1 to 3, an agricultural tractor A has a vehicle body frame 3 which is horizontally mounted between traveling frames 2 and 2 of a pair of left and right crawler type traveling portions 1 and 1, and 3 is provided with a prime mover section 4 on the front side thereof, while an integral support machine frame 5 is mounted on the rear side thereof via front and rear vibration isolator 6, 6, 7, 7 to form a cabin 8 on the same body support machine frame 5. A fuel tank 9 and a hydraulic oil tank 10 are provided.

As shown in FIGS. 1 and 2, the prime mover section 4 mounts a battery 11 on a lower portion of a front end of a vehicle body frame 3 via a battery mounting base 12, and sequentially from the front end portion of the vehicle body frame 3 toward the rear. , Condenser 13, oil cooler 14, radiator 15, engine 16, muffler 17, main cleaner 18, and precleaner 19 are arranged
Air cut plate 20 between 16 and main cleaner 18
The motive engine part 4 includes a bonnet 21 and a front grille 22 which is attached to a front end edge of the bonnet 21 via a pivot bracket 23 so as to be openable and closable forward. It is covered. Reference numeral 24 denotes an elevating mechanism mounting body which is erected between the rear ends of the body frame 3.

Further, the mission section 25 is linked to the engine 16 so that the engine 16 and the mission section 25 are integrally supported by the vehicle body frame 3 via a vibration isolator (not shown). Anti-vibration effect is provided by a swing.

As shown in FIGS. 1 to 3, a cabin 8 is placed on the integrated support frame 5, and an operating section M is provided on a floor F in the cabin 8 and the operating section is provided. By using M, the rotation ratio of the hydraulic motors ML, MR for left / right traveling, which will be described later, is changed, and further, the HST as a continuously variable transmission for accelerating and decelerating by synchronizing the hydraulic motors ML, MR for left / right traveling is steered and operated. In addition to the above, the seat 26 is disposed immediately behind the operation unit M via the seat support 27 to form the driving unit Q.

Next, the operating portion M, which is the subject matter of the present invention, will be described with reference to FIGS.

That is, as shown in FIGS. 4 to 7, the operating section M has a handle column 28 standing on an operating table 40, and a circular handle 29 is attached to the upper end of the handle column 28. While attaching the speed change lever 30 to the position near the left side of the handle 29, attach the accelerator lever 81 to the position near the right side,
The PTO on / off lever 82 is located directly below the accelerator lever 81.
And the brake pedal 31 is arranged at the right side position of the operation console 40. 83 is a brake pedal lock mechanism, 83a is a lock hook, 83b is a lock hook rotation operation lever, 84 is an engine starter switch, and a switch operating plate linked to the brake pedal 83 when the engine starter switch 84 is stepped on. The 85 contacts and turns on the switch.

In the handle column 28, as shown in FIGS. 4 to 7, a support shaft insertion tube 32 whose lower end is continuously connected to the ceiling wall of the operation console 40 is erected directly upward and a midway portion. The support shaft insertion tube 32 is formed by extending it obliquely upward and rearward.
The handle shaft 33 is inserted thereinto, and the lower end of the handle shaft 33 is interlockingly connected to a slide acting body 45 which constitutes a part of an HST acceleration / deceleration mechanism N described later, while the upper end of the handle shaft 33 has a circular shape. The center of the handle 29 is attached.

In the condor column 28, as shown in FIG.
As shown in FIG. 7, a support cylinder 34 with its axis lined in the vertical direction is attached to the upper part of the support shaft insertion tube 32 via mounting brackets 35, 35, and a lever support shaft 36 is inserted into the support shaft 34. hand,
The lower end of the lever support shaft 36 is interlockingly connected to a speed change shaft 41 laid horizontally in an operation console 40 described later via an interlocking mechanism 37, while the speed change lever 30 is attached to the upper end of the lever support shaft 36. The gear shift lever 30 has a tip grip portion 30a extending outward from the middle part toward the left side, and the tip grip portion 30a is substantially equal in distance from the grip portion of the circular handle 29 and the axis of the handle shaft 33. It is located directly below the left side.

In this manner, the crawler type left and right traveling parts 1, 1 can be steered by the circular handle 29, so that the steering operation can be performed smoothly and surely even in a muddy wetland. It is possible to improve the operability.

In addition, the gear shift lever 30 for shifting the left and right traveling parts 1 and 1 is arranged near the lower portion of the handle 29, and the tip grip portion 30a of the gear shift lever 30 is handled.
The handle 29 is placed at a position where the grips of the handle 29 and the axis of the handle shaft 33 are substantially equal to each other, and the operator holds the handle 29 with his right hand.
While holding the steering wheel for steering operation, use the left hand
The 30 has been designed so that it is possible to shift gears easily. Therefore, a safe and reliable steering operation can be performed even in a work that requires frequent forward / backward switching operations, and operability can be improved in this respect as well.

As shown in FIGS. 4 and 6, the interlocking mechanism 37 attaches the arm 65 to the lower end of the lever support shaft 36 while fixing the rear end to the support shaft insertion tube 32 and projecting the front end forward. The middle part of the triangular plate 67 is pivotally supported on the fixed plate 68 by a pivot shaft 69 having an axis lined in the left-right width direction, and a connecting rod is provided between one top of the triangular plate 67 and the arm 65.
66 is provided, and a connecting rod 70 is provided between the other top of the triangular plate 67 and one end of a cam plate 71 disposed directly below the triangular plate 67. Is formed into a substantially fan shape, and is pivotally supported by a support shaft 72 via a fulcrum boss portion 71b provided at the center thereof.The cam plate 71 extends in the radial direction from the vicinity of the support shaft 72 and gradually An arcuate cam groove 71c that curves in the tangential direction is opened, and a sliding roller 73 is engaged with the cam groove 71c so that the sliding roller 73 can slide along the cam groove 71c, while the sliding roller 73 has an arm 74. The other end of the arm 74 is supported by a horizontal shaft 75 rotatably mounted above the operation console 40.
The arm 74 is fixed so that the rotation direction of the arm 74 is perpendicular to the rotation direction of the cam plate 71. That is, the rotation locus of the sliding roller 73 is set to be substantially in the radial direction about the support shaft 72. An arm 79 is fixedly mounted on the horizontal shaft 75, one end of a connecting rod 80 is pivotally connected to the arm 79, and the other end of the connecting rod 80 is provided at an end of the transmission shaft 41. It is pivotally connected to an arm 78 projecting from the portion 41a.

With this structure, the lever support shaft 36 is rotated by rotating the shift lever 30, and the triangular plate 67 is rotated via the arm 65 and the connecting rod 66. Rotation is via a connecting rod 70 and a cam plate.
When the cam plate 71 rotates, the sliding roller 73 slides along the cam groove 71c, and the arm 74 rotates to rotate the arm 74.
The main transmission shaft 41 is rotated via 79, the connecting rod 80, and the arm 78.

Here, in the embodiment of the present invention, as shown in FIGS. 4 and 14, a two-pump / two-motor type HST is used as a continuously variable transmission, and the left and right traveling sections 1 and 1 travel separately. It is drivable, and the handle 29 is of a rotary type, and by changing the number of rotations and the direction of rotation of each crawler of the left and right traveling units 1 and 1 in accordance with the amount of rotation, the aircraft can be turned, and at the same time. By rotating the shift lever 30, the rotation speed and rotation direction of the left and right traveling hydraulic motors ML and MR can be changed.

The gear shift lever 30 and the handle 29 are constructed so that they can be operated separately, and they are interlocked with a pair of left and right HST acceleration / deceleration mechanisms N and N in the operation console 40.
As shown in FIG. 14, the ST acceleration / deceleration mechanism N, N
The left and right traveling hydraulic pumps PL, PR are linked to the left and right swash plates 98, 99, and the left and right traveling hydraulic motors ML, MR are connected to the respective hydraulic pumps PL, PR. By controlling the swash plates 101 and 102 respectively, the left and right traveling parts 1 and 1 can be moved forward, backward and stopped.

That is, as shown in FIGS. 8 and 9, since the internal structure of the operation console 40 is substantially symmetrical, one side will be described. A slide shaft 44 is laid horizontally in parallel with 41. A pair of left and right slide bodies 43, 43 as steering switching bodies are externally fitted to the transmission shaft 41 so as to be slidable in the axial direction, and a slide acting body 45 is interlocked with the handle 29 between the slide bodies 43, 43. Is installed on each slide body 43, 43
The T acceleration / deceleration mechanism N and N are interlockingly connected, and the HST acceleration / deceleration mechanism N includes a guide body 50, a rotor 51, and a rotor support arm.
52, an arm 55 for swash plate operation, a first connecting rod 56, a first arm 86, an intermediate shaft 87, a second arm 88 and a second rod 89.

The slide acting body 45 is a base 45b slidably attached to the slide shaft 44 in the axial direction, and a main body 45 integrally attached to the base 45b and arranged directly below the transmission shaft 41.
The main body 45c has a substantially L-shaped cross-section that is bent downward from the side of the main transmission shaft 41, and a rack 45a is fixed to the lower surface in the left-right direction.

A pinion gear 46 is meshed with the rack 45a. The pinion gear 46 is fixed to the pinion shaft 46a, and the pinion shaft 46a is arranged above the handle 29.
It is attached to the lower end of the handle shaft 33. Therefore, when the handle 29 is rotated, the pinion gear 46 is rotated and the rack is rotated.
45a interlocks and slides in the left-right direction, and the sliding action body 45 slides accordingly, pushing one of the slide bodies 43, 43 via the guide support arm 47.

An arm support portion 47a of a guide support arm 47 is loosely fitted inside the outer peripheral surface of the slide body 43, and a detent body 47b is extended from the front outer peripheral surface portion of the arm support portion 47a toward the slide shaft 44. The same rotation stopper body 47b as the slide shaft.
It fits loosely in 44 to slide in the left and right direction. On the other hand, the arm support 47a extends rearward and downward from the rear, and a boss 47c is attached to the tip of the arm support 47a. A pivot pin 47d having an axis in the front-rear direction is rotatably mounted on the boss 47c. The center of the front wall of the guide body 50 is fixed to the rear end of the pivot pin 47d. The guide body 50 extends in the left-right direction, and is formed in a U-shape in cross section with an open rear surface.

A swing arm 48 extends rearward from the outer periphery of the slide body 43, and an upper end of a swing link 48c, which is adjustable in expansion and contraction, is connected to a tip of the swing arm 48 by a connecting pin 48.
The lower end of the swing link 48c pivotally supports one end of the front wall of the guide body 50 via a connecting pin.

A rotatable rotor 51 is inserted into the recess of the guide body 50 and is slidably fitted in the left-right direction. The rotor 51 has an axial center in the left-right direction. The rotor support arm 52 extends and is attached to one end of the rotor support arm 52. The other end of the rotor support arm 52 has a boss portion 53 fixed to the rear wall of the operation table 40 and an axis line in the front-rear direction. An end of a swash plate actuating arm 55, which is vertically pivotably supported by an arm support shaft 54, which extends vertically to the end of the arm support shaft 54 on the outside of the operation table 40, has a fixing bolt 55a. Fixed by
One end of the first connecting rod 56 is connected to the other end through a connecting pin 56a, and the other end of the first connecting rod 56 has an L-shaped lever 105 having an intermediate portion pivotally supported on the bottom of the operation console 40. One end is connected, and the second connecting rod 106 is connected to the other end of the L-shaped lever 105.
Of the first arm 86 is connected to the other end of the second connecting rod 106, and the base end of the first arm 86 is H-shaped.
It is attached to the upper end of an intermediate shaft 87 which is attached to ST with the axis line up and down, the base end of a second arm 88 is attached to the lower end of the intermediate shaft 87, and the second rod is attached to the tip of the second arm 88.
One end of 89 is connected, and the other end of the second rod 89 is connected to the swash plate connecting arm 100 of HST. 107 is an L-shaped lever spindle.

In such a structure, the rotation of the handle 29 causes the slide action body 45 to slide, and one of the slide bodies 43, 43 is pushed via the guide support arm 47 along the slide shaft 44 and the speed change shaft 41. Moved, slide body 43
The guide body 50 provided integrally with the
・ Slides in the a direction.

When the speed-changing shaft 41 is rotated by the speed-changing lever 30, the guide body 50 is moved through the swing link 48c connected to the slide body 43 so that the arrow b.
The swash plate operating arm 55 is oscillated about the arm support shaft 54 as shown by arrows c and c.

Next, the state of the guide body 50 when the handle 29 and the shift lever 30 are operated will be described with reference to FIGS. That is, when the speed change lever 30 is in the neutral state and the rotary handle 29 is also in the neutral state at the same time, the left and right guide bodies 50, 50, the rotor support arms 52, 52 and the swash plate operating arms 55, 55 are As shown in FIG. 10, it maintains a horizontal posture. When the shift lever 30 is shifted from this state to the forward shift position, the shift shaft 41 is rotated, and the left and right slide bodies 43, 43, the swing arms 48, 48, and the swing link 48.
c, 48c are interlocked, and the left and right guide bodies 50, 50 are connected to the pivot pin 47d,
As shown in FIG. 11, the rotor support arms 52, 52, the arm support shafts 54, 54, and the swash plate actuating arms 55, 55 are rotated via the left and right rotors 51, 51 by rotating them around the center of the shaft 47d. Then, it becomes a tilted posture. In this case, the left and right swash plates 101 and 102 that control the left and right traveling hydraulic motors ML and MR have the same inclination angle, the left and right traveling units 1 and 1 travel forward at the same speed, and the machine body travels straight.

Next, when the handle 29 is rotated to the right from the above-mentioned straight traveling state to rotate right, the pinion shaft 46a rotates, and the rack 45a meshing with the pinion gear 46 moves to the right, A slide acting body 45 pushes and slides the slide body 43 to the left side together with the rack 45a. Then, the right guide body 50 moves integrally with the slide body 43 in the right direction,
The guide body 50 slides rightward in the tilted posture. Then, as shown in FIG. 12, the rotor 51, which has been fitted to the right guide body 50, is pushed downward to fit into the substantially central position of the right guide body 50, Right rotor support arm 52 and swash plate actuating arm 55
Is rotated and approaches a horizontal position, and the right-hand drive hydraulic motor MR
The right swash plate 102 for controlling the swash plate is brought close to the neutral state. In this case, the right-hand traveling unit 1 is decelerated or stopped from the straight traveling state, and the left traveling unit 1 keeps moving forward, so that the aircraft slowly turns right.

Next, in the right turning state, the handle 29
When the is rotated further to the right, the right guide unit
The reference numeral 50 slides further to the right in the tilted posture, and the right rotor 51 is fitted to the left side portion of the guide body 50 as shown in FIG. The swash plate actuating arm 55 is in a tilted posture of left high and right low, and the right swash plate 102 is tilted toward the reverse control side. In this case, the right-side traveling unit 1 travels backward, while the left-side traveling unit 1 travels forward, so that the body makes a spin turn.

Next, the hydraulic circuit K will be described with reference to FIG. That is, the hydraulic circuit K connects the HST hydraulic circuit 90 to the hydraulic tank T, connects the left side traveling unit driving hydraulic circuit 91 and the right side traveling unit driving hydraulic circuit 92 to the HST hydraulic circuit 90, respectively. Hydraulic pump for left and right running of circuit 90
While connecting the working machine lifting hydraulic circuit 93 to the working machine lifting hydraulic pump P1 linked to PL and PR, connect the work machine lifting hydraulic circuit 93 to the charge pump P2 linked to the left and right hydraulic pumps PL and PR via the rotary valve 94. The hydraulic circuit 9 for driving the left and right side traveling parts.
Brake devices 95 and 96 provided at 1,92 are connected. 97 is a bypass operation switching valve.

The brake pedal 31 is connected to the rotary valve 94 in an interlocking manner, and the rotary valve 94 is switched and linked to the depression operation of the brake pedal 31, so that the brake devices 95 and 96 are braked. I am configuring.

That is, the brake devices 95, 96 are provided with piston rods 95c, 96c biased in the extension direction by springs 95b, 96b in cylinders 95a, 96a, respectively, and press-contact bodies are attached to the tips of the piston rods 95c, 96c. 95d, 96d are attached, and each pressure contact body 95d, 96d is connected to the drive wheel 1a, 1a of each traveling section 1, 1.
By supplying oil into each cylinder 95a, 96a, the piston rods 95c, 96c are shortened against the bias of the springs 95b, 96b, and the pressure contact bodies 95d, 96d are driven by the drive wheels. The cylinders 95a, 96a are separated from 1a, 1a so that they can be brought into a non-brake operating state.
By discharging the oil from the inside, the piston rods 95c, 96c are extended by the biasing force of the springs 95b, 96b, and the pressure contact bodies 95d, 96d are in pressure contact with the drive wheels 1a, 1a, and the brakes are activated. I am able to

In this way, by depressing the brake pedal 31, the driving of the left and right running parts 1, 1 can be stopped at the same time by the left and right brake devices 95, 96. Brake depressing operation can be performed with the same pedal operation feeling, and good safety can be ensured.

In the combine A, the gist of the present invention is that the handle locking means G provided in the steering mechanism.
In the following, referring to FIG. 15, the handle lock means G
Will be described.

The handle lock means G has a substantially plate-like handle lock locking piece 160 projecting rearward on the rear surface of the handle shaft 33 when the handle 29 is in the neutral position, and the handle shaft 33 The plate-shaped left and right bases 16
1,161 are installed upright with a predetermined interval, and left and right bases 161,16
A handle lock shaft 162 is rotatably and rotatably inserted through the upper end of the handle lock shaft 162, and one end of the handle lock shaft 162 is bent upward to form a substantially L-shaped handle lock operation lever 163.
And the fulcrum crossing mechanism on the other end of the handle lock shaft 162.
164 are installed in series.

The fulcrum crossing mechanism 164 has a handle lock shaft 16
A fulcrum crossing lever 165 extending diagonally upward is connected to the other end of 2, and a lever-side spring locking body 166, which is a substantially round bar, projects from the tip of the fulcrum crossing lever 165. Between the locking body 166 and the fixed side spring locking body 167 protruding from the outer surface of the left base 161, the tension spring 16
8 is stretched in advance by applying a predetermined tensile biasing force.
Further, stoppers 169 and 170 are provided on the outer surface of the left base 161 so that the rotation of the handle lock shaft 162 is stopped at the lock position 171 or the unlock position 172 by abutting the fulcrum crossing lever 165. ing.

Then, a handle lock arm 173 extending in the forward direction is projectingly provided at an intermediate position between the left and right bases 161, 161 in the middle of the handle lock shaft 162, and the handle lock arm 173 is opened in the forward direction at the tip thereof. A substantially U-shaped handle lock body 174 is continuously provided.

With this structure, when the handle 29 is operated to the neutral position and the handle lock operating lever 163 is pivoted rearward to bring the handle lock operating lever 163 to the lock position 171, the handle lock shaft is released. 162
The handle lock body 174 protruding from the upper part of the handle pivots upward to the engagement position with the handle lock engagement piece 160, and locks and locks the handle lock engagement piece 160 with the opening of the handle lock body 174. The handle is locked. Therefore, the turning operation of the handle 29 is restricted, and the straight traveling state of the machine body is maintained.

When the handle lock operation lever 163 is rotated forward from the above handle lock state to bring the handle lock operation lever 163 to the unlocked position 172, the handle lock body 174 rotates downward, The engagement state between the handle lock engagement piece 160 and the handle lock body 174 is released, and normal handle operation becomes possible.

Further, since the handle lock is released while the handle lock operating lever 163 is rotated forward, the lever 163 does not interfere with the handle operation, and the lever 163 is touched carelessly. It is possible to prevent the erroneous operation from occurring.

If a play 175 is set between the handle lock engagement piece 160 and the inner surface of the opening of the handle lock body 174, a slight steering operation can be performed even while the handle is locked. Therefore, it is possible to finely adjust the traveling direction of the aircraft even when the steering wheel is locked. The amount of the play 175 can be appropriately set based on the size of the machine body, the response of the steering device, the usage state, and the like.

Further, since the fulcrum crossing mechanism 164 is continuously provided at one end of the handle lock shaft 162, the locked or unlocked state can be held by stopping the rotation by the stoppers 169 and 170, so that the position of the detent mechanism or the like can be maintained. No holding mechanism is required.

16 and 17, when the reel 181 of the reaping / conveying device D is raised to the highest position, the power transmission to the reel 181 is cut off and the rotation of the reel 181 is stopped so that the worker can thresh. It shows a general-purpose combine equipped with a reel automatic stop device 180 for ensuring safety when throwing an object into the reaping and conveying device D, and a partially cutaway side view of the reel automatic stop device 180. The reel 181
A passive side pawl clutch urged outward by a return spring 183 at one end of a reel drive shaft 182 linked to
184 is spline-fitted so that it can slide and cannot rotate in the axial direction.
Further, a driving side pawl clutch 185 is fitted so as not to be slidable in the axial direction and rotatable, and a pulley 186 for interlockingly connecting with the engine E is formed outside the driving side pawl clutch 185.

On the other hand, a pivot 187 is projected on the airframe to
A substantially L-shaped power cut lever 188 is rotatably and pivotally attached to the 187, and a shift fork 190 having a tip portion inserted into a shift groove 189 formed in the passive side claw clutch 184 is provided at a lower end of the power cut lever 188. Power cut lever 188
The contact body mounting plate 191 is connected to the upper end of the
A contact member 195 located above the reel arm 194 supporting the reel 181 via the bolt 192 and the nut 193 on the 191.
Is detachably attached.

Therefore, together with the reel 181, the reel arm 19
When 4 rises and reaches the highest position, the reel arm 194 pushes the contact body 195 upward, and the power cut lever 188
The power transmission to the reel 181 is cut off by moving the passive side claw clutch 184 inward via the shift fork 190 and separating it from the driving side claw clutch 185.
The rotation of the 181 can be stopped.

When the reel 181 is lowered, the passive side pawl clutch 18 is urged by the return spring 183.
4 moves outward and engages with the driving side claw clutch 185, power is transmitted to the reel 181, and the reel 181 can be rotated.

In order to harvest tall crops such as coix and sunflower, the abutment body 195 can be removed when the reel 181 is raised to the highest position.

[0051]

According to the present invention, the left and right traveling hydraulic motors are provided on the pair of left and right crawler type traveling portions respectively, and the left and right traveling hydraulic pumps for driving the respective traveling hydraulic motors are located below the floor portion of the operating portion. In order to operate the steering gear and shift gears, the steering gear is used to change the rotation ratio of the left and right traveling hydraulic motors for steering, and the gear shift lever synchronizes the left and right traveling hydraulic motors for acceleration and deceleration. In a work vehicle in which the operating part of is provided on the floor, a handle lock locking piece is provided to project on the handle shaft, and a handle lock shaft interlocked with a handle lock operating lever is rotatably laid horizontally.
A handle lock arm is protrudingly provided on the handle lock shaft, and a substantially U-shaped handle lock body is continuously provided at the end of the handle lock arm, and a handle is locked to a handle lock locking piece by rotating the handle lock shaft. Since the lock body can be disengaged and held, and the handle can be held in the neutral position, for example, when loading and unloading on a truck using a step board by self-propelled, the handle lock operation lever is operated to operate the handle. If the vehicle is locked in the straight-ahead position, the work vehicle keeps the straight-ahead state, so that the work vehicle can be safely loaded and unloaded without stepping on the step board or the like.

If the handle locking means is provided with appropriate play, the handle can be finely adjusted, so that steering can be performed within a safe range.

Furthermore, a position holding mechanism such as a detent is required by interlocking with the handle lock shaft a fulcrum crossing mechanism for stopping the rotation of the handle lock shaft at either the lock position or the lock release position. The structure can be simplified without doing so.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an agricultural tractor including a handle lock device according to the present invention.

FIG. 2 is a plan view of the agricultural tractor.

FIG. 3 is a rear view of the agricultural tractor.

FIG. 4 is a left side view of the operation unit.

FIG. 5 is a right side view of the operation unit.

FIG. 6 is a front view of the operation unit.

FIG. 7 is a plan view of the operation unit.

FIG. 8 is a cross-sectional plan view showing the structure inside the operation console.

FIG. 9 is a partial perspective view showing the internal structure of the operation console.

FIG. 10 is a partial front view of the operation console in a neutral state.

FIG. 11 is a partial front view of the operation console in a straight traveling state.

FIG. 12 is a partial front view of the operation console in a right turning state.

FIG. 13 is a partial front view of the operation console during a pivot turn.

FIG. 14 is a hydraulic circuit diagram.

FIG. 15 is an explanatory perspective view of a handle lock unit.

FIG. 16 is a side view of a general-purpose combine having a reel automatic stop device.

FIG. 17 is a partially cutaway front view of the reel automatic stop device.

[Explanation of reference symbols] G handle locking means 29 handle 33 handle shaft 160 handle lock locking piece 161 base 162 handle lock shaft 163 handle lock operating lever 164 fulcrum crossing mechanism 173 handle lock arm 174 handle lock body

Claims (1)

[Claims] 1. A pair of left and right crawler type traveling parts are provided with respective left and right traveling hydraulic motors, and a left and right traveling hydraulic pump for driving the respective traveling hydraulic motors is disposed below the floor of the operating portion. , The steering wheel is used to change the rotation ratio of the left and right traveling hydraulic motors for steering, and the gear shift lever synchronizes the left and right traveling hydraulic motors for acceleration and deceleration. In a work vehicle provided on the floor, a handle lock locking piece is provided on the handle shaft,
A handle lock shaft linked to the handle lock operation lever is rotatably mounted horizontally, and a handle lock arm is projected on the handle lock shaft, and a handle lock body of a substantially U shape is attached to the tip of the handle lock arm. The handle lock body can be disengaged / engaged with the handle lock locking piece by rotating the handle lock shaft, and the rotation of the handle lock shaft can be locked to the lock position with the handle lock shaft. A handle lock device for a work vehicle, comprising: a handle lock means for holding the handle at a neutral position by interlockingly connecting a fulcrum crossing mechanism that stops at either a release position.