JP2000342003A - Cultivator - Google Patents

Abstract

(57) [PROBLEM] To provide a tilling cultivator in which operation means such as a main shift lever and a differential lock lever are difficult to operate unless a clutch lever is integrally held with a steering handle. Prevent erroneous operation of the means. The operating unit has a clutch lever that is linked to a clutch for connecting and disconnecting the power of a cultivator and is brought into a “contact” position by being integrally held with a steering handle having a loop shape in plan view. Operating means for operating (main shifting operation means 6
When the clutch lever is at the "disengaged" position 7 'in the tilling machine having the differential lock operating means 8) provided on the operating portion 9, the operating means 6.8 and the clutch lever 7 are at least partially viewed from the side. Arranged to overlap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking type cultivator for performing, for example, medium tillage or tillage work. More specifically, the present invention relates to a technique for providing an easy-to-operate layout in an operation unit of the cultivator and preventing erroneous operation.

[0002]

2. Description of the Related Art Conventionally, a traveling handle is provided diagonally above and behind a transmission case in which traveling wheels are mounted.
BACKGROUND ART The technique of a tiller for performing a tillage operation or the like is known. Also, a tiller having the following configuration is known. That is, a clutch lever for operating a clutch arranged in the power transmission path of the cultivator is provided in the operation unit, and this clutch lever is flipped up to a “disengaged” position when not working. When the clutch lever is pressed against the biasing force by the operator and pressed by the operator, the clutch lever comes to the "contact" position. The clutch lever is formed along the steering handle, and the operator can operate the clutch lever during operation. The direction handle and the clutch lever are configured to be able to be gripped integrally. It is a so-called deadman clutch lever. With the above configuration, at the time of work, the operator grips the steering handle and the clutch lever together to bring the clutch into the "contact" state, transmit the power of the engine to the running wheels and the working machine, and perform tilling work and the like. When the mowing operation is not performed, the operator releases the steering handle and the clutch lever during non-working, and the clutch lever is set to the “disengaged” position by the above-mentioned biasing force, the power transmission is cut off, and the tiller stops. It is configured to be. With this configuration, the clutch is driven when the clutch lever is gripped and stopped when released, so that the drive stop operation is easy to understand, and even an unfamiliar person can operate easily. In addition, since the drive of the cultivator is stopped immediately even when the hand is released from the handle, erroneous operation is prevented and efficient work is enabled.

[0003]

The conventional cultivator as described above has been quite useful in that the operation method is easy to understand, but when the main transmission is a continuously variable transmission,
The gear may be shifted forward or backward just by touching the hand, and there is a risk of sudden movement when the clutch lever is gripped. Therefore, there has been a demand for a technique of a cultivator in which the operation method is easy to understand. The present invention has been made from such a viewpoint, and provides a layout of an operation unit in which a main shift lever and a differential lock lever are difficult to operate unless a clutch lever is integrally held with a steering handle. Things.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in the first aspect, the clutch lever, which is linked to the clutch for connecting and disconnecting the power of the cultivator and is brought into the "contact" position by being integrally held with the loop-like steering handle in plan view, is provided on the operation unit. In a cultivator having a configuration in which an operation unit for performing a traveling operation is provided in the operation unit, when the clutch lever is in the “disengaged” position, the operation unit and the clutch lever are arranged so as to at least partially overlap in a side view. It was done.

According to a second aspect of the present invention, the operation means is a main speed change operation means.

According to a third aspect of the present invention, the operating means is a differential lock operating means.

[0008]

Next, embodiments of the present invention will be described. First, an overall configuration of a cultivator according to an embodiment of the present invention will be described. FIG. 1 is a side view showing an overall configuration of a cultivator according to one embodiment of the present invention, and FIG. 2 is a plan view of the same.

That is, as shown in FIGS. 1 and 2, this cultivator has a pair of left and right running wheels 1.1 mounted on a transmission case 2 via axles 3.3, and a handle stand at the rear of the transmission case 2. The lower part 4 is fixed, and a steering handle 5 having a loop shape in plan view is connected to the upper part of the handle base 4, so that the steering handle 5 is positioned obliquely rearward and above the transmission case 2. Then, a clutch lever 7, a main shift lever 6 as a main shift operating means, a differential lock lever 8 as a differential lock operating means, an accelerator lever 10 for changing the engine speed, and the like are attached to the operating section 9 near the steering handle 5. ing. The main transmission lever 6 is also used for connecting and disconnecting a PTO clutch, which will be described later. The forward and backward tilting of the lever performs the forward and backward movement and speed changing operation of the cultivator, and the left and right tilting performs the connecting and disconnecting operation of the PTO clutch. .

As shown in FIG. 1, an engine 11 is mounted and fixed on a substantially horizontal surface 2a on the upper surface of the transmission case 2, and the output of the engine 11 is continuously variable. HST ”) 12 for Mission Case 2
The output shaft 17 of the engine 11 and the input shaft 1 of the HST 12 are provided on the right and left sides of the rear part (the right side in the traveling direction in this embodiment).
8 and the output pulley 15, the input pulley 16, the belt 14
Are linked by A fuel tank 34 is provided above the engine 11. Further, a belt tension clutch 13 for connecting and disconnecting power transmission between the two shafts 17 and 18 is provided, and the tension clutch 13 is linked to the clutch lever 7 of the operation unit 9 via a link mechanism, a wire, and the like (not shown). The clutch lever 7 operates to connect or disconnect the tension clutch 13. Further, a brake that performs braking in conjunction with the switching of the tension clutch 13 to “disengage” is provided on the input shaft 18 of the HST 12, and the rotation by the inertia force immediately after the clutch “disengage” operation is braked to stop the drive. I try to do it quickly.

The transmission case 2 is formed in an "L" shape when viewed from the side, and the rear side is projected downward to form a vertically extending portion 19, and left and right axles 3, 3 are provided at the lower portion on the rear side of the transmission case 2. The transmission transmission mechanism 20 is provided in the vertically extending portion 19 at the rear of the transmission case 2, and the input shaft 18 is disposed almost directly above the axles 3, 3, and the output is output almost directly above the input shaft 18. A shaft 17 is provided. Further, the HST 12 is disposed below the engine 11, the axles 3 are disposed below the HST 12, and the driving force of the engine 11 is transmitted from above to below to drive the traveling wheels 1.1. With this configuration, the transmission layout can be simplified, and the maintainability can be improved. Further, the transmission case 2 can be made compact, and the size of the aircraft can be reduced.

Further, the upper portion of the transmission case 2 is projected forward to form a front-rear extension portion 28, and a PTO
The shaft 21 is pivotally supported, and as shown in FIG. 2, pipe members 99 are projected to the left and right of the front of the transmission case 2, and the transmission case 22 and the side frame 23 are moved to the front of the transmission case 2 via the pipe members 99. To the working machine 24 via the transmission case 22 and the side frame 23.
A work machine 24 is mounted on the front side of the transmission case 2 and both ends of a rotary shaft 25 are rotatably supported on the transmission case 22 and the side frame 23. The work machine 24 serves as a rotary tilling device and a mower. I have. In other words, a plurality of cutting rotary blades 26 used for plowing and mowing are also used.
Is attached to a rotary shaft 25, and each cutting rotary blade 26
The upper surface and the left and right of 26 are closed by a rotary cover 27.

A PTO transmission mechanism 29 including a PTO clutch, a forward / reverse switching mechanism, a speed reduction mechanism, and the like is provided in a front-rear extension portion 28 of the transmission case 2.
A PTO shaft 21 is provided in front of the rotary shaft 2 of the working machine 24.
5 by rotating the cutting rotary blades 26 at a low speed in the same direction as the forward rotation of the traveling wheels 1.1 (the direction of arrow A, hereinafter referred to as "forward rotation direction"). In the opposite direction (hereinafter "reverse direction")
The cutting rotary blades 26 are rotated at high speed to perform mowing work.

Further, this cultivator is provided with a post-working machine 30 for performing the banking work at the same time as the cultivation work of the working machine 24 (FIG. 1). The post-working machine 30 is detachably provided, and the post-working machine 30 is rotated around the hitch pin 32 so as to be able to move up and down. The rear work machine 30 is lifted to the side to be supported in the non-work position.

Next, the configuration of the working machine 24 will be described mainly with reference to FIGS. FIG. 3 is a side view showing a configuration of a working machine attached to a front part of the cultivator, and FIG. 4 is a plan view of the same. FIG. 5 is a side view, partly in section, showing the mounting configuration of the rotary blade in the working machine.

That is, the height adjusting arms 39, 39 and the gauge frames 35, 35 are pivotally supported at the appropriate positions on the left and right of the working machine 24 via the support shafts 40, 40, and the tips of the gauge frames 35, 35 are Gauge wheel 36.3 projected forward
6 are mounted so as to be able to change directions, so that a gauge wheel 36 can be moved up and down via a gauge frame 35. Further, a bracket 81 is fixed to the gauge frames 35, 35, and both left and right ends of a front cover 45 having a gate shape in a plan view are rotatably attached to the bracket 81 via support shafts 46. The front cover 45 is raised or lowered in conjunction with the vertical tilting operation.

A plate-like member 82 is projected from the upper edge of the left and right side surfaces of the front cover 45, and a pin 83 is projected from the plate-like member 82. The two concave portions 39a and 39b are provided. With this configuration, by locking the pin 83 in the upper concave portion 39a, the gauge frame 35 is tilted upward so that the gauge wheel 3
6 can be held and fixed while being raised to the tilling work position Na. On the other hand, by locking the pin 83 to the lower concave portion 39b, the gauge frame 35 is tilted downward so that the gauge wheel 36 can be held and fixed in a state of being lowered to the mowing work position Nb. Gauge wheel 36
Of the height of the grip 8 provided on the front of the front cover 45 can be changed.
4 is carried out by the operator holding and raising / lowering operation. A wire 85 is connected to the bracket 81, and is linked to a forward / reverse switching clutch slider (reference numeral 78 in FIG. 6), which will be described later, provided on the PTO transmission mechanism 29 of the transmission case. When the wheel 36 is in the tilling operation position Na, the low-speed rotation in the normal rotation direction is transmitted to the rotary shaft 25, and when the gauge wheel 36 is in the mowing operation position Nb, the high-speed rotation in the reverse rotation direction is transmitted to the rotary shaft 25. Like that.

With the above structure, when the operator grips and lifts the grip portion 84 of the front cover 45, the gauge frame 35 is tilted upward, the gauge wheel 36 is raised to the tilling operation position Na, and the rotary shaft 25 is The relative height with respect to the gauge wheel 36 is reduced, so that the cutting rotary blade 26 can penetrate into the ground at a depth suitable for tilling work, and the front cover 45 is also raised and retracted so as not to hinder the tilling work. ing. Further, the pulling of the wire by the bracket 81 is released, and in conjunction with this, the forward / reverse rotation clutch slider 78 in the PTO transmission mechanism 29 is slid to disengage the clutch, and the tiller is driven in this state. In this case, the low-speed rotation in the normal rotation direction (arrow A) is transmitted to the rotary shaft 25 so that the tilling operation is performed. On the other hand, when the user presses down while holding the grip portion 84,
The gauge frame 35 is tilted downward, the gauge wheel 36 is lowered to the mowing work position Nb, the relative height of the rotary shaft 25 with respect to the gauge wheel 36 increases, and the position becomes suitable for mowing work. The rotary cover 27 is lowered to shield the front part of the rotary cover 27, thereby preventing the cut grass and the like from scattering. Further, since the bracket 81 pulls the wire, the clutch in the PTO transmission mechanism 29 is disengaged in conjunction therewith, and in this state, when the cultivator is driven, the rotary shaft 25 rotates at a high speed in the reverse direction. It is transmitted and mowing work is performed.

As described above, since the switching operation between the mowing operation and the tilling operation of the cultivator is performed by the gripping portion 84 in front of the cultivator, this switching operation can be performed by the operator at the rear portion of the cultivator. This operation must be performed by once leaving the operation unit 9 and rotating the front of the work machine 24 to operate the grip unit 84. This means that the switching operation must be performed in a state where the hand is released from the clutch lever 7 of the operation unit 9 of the cultivator. Therefore, the switching is always performed by the work machine 24 and the traveling wheels 1.1. Is not transmitted, erroneous operation or the like is prevented, and the possibility of failure or the like is reduced.

Further, a height adjustment handle shaft 42a is rotatably and non-slidably mounted on a receiving base 41 fixed to a middle portion of one of the left and right pipe members 99, 99. A screw portion 44 is provided at the front end, and the left and right adjusting arms 39 are connected at their upper portions by a connecting pipe 80. The screw portion 44 is screwed to a screw 43 attached to an intermediate portion of the connecting pipe 80. The gauge frame 35 is swung around the support shaft 40 by the rotation operation of the height adjustment handle 42 that fixes the base end to the rear end of the height adjustment handle shaft 42a so that the height of the gauge wheel 36 can be finely adjusted. ing.

As shown in FIGS. 3 and 4, a claw 49 is fixed to the rotary shaft 25, and the support shaft 5 is fixed to the claw 49.
0, the cutting rotary blade 26 is pivotally supported, and during mowing work, the rotary shaft 25 is rotated in the reverse direction (the direction opposite to the arrow A).
By rotating the cutting rotary blade 26 at high speed, the cutting rotary blade 26 rotates while being held in the radiation direction by centrifugal force. Further, even if the cutting rotary blade 26 hits a stone or the like during mowing work, the impact is absorbed by the rotation of the cutting rotary blade 26 around the support shaft 50, so that the working machine 24 is prevented from being damaged. ing. On the other hand, a retraction stopper 51 is fixed to the claw base 49, and when the rotary shaft 25 is rotated forward in the direction of arrow A to perform tilling work, the cutting rotary blade 26 abuts on the stopper 51. In addition, the cutting rotary blade 26 is held in a backward tilted posture, and the tilling resistance is reduced by the formed receding angle, and the tilling force (tiling depth) is secured.

Next, the vertically extending portion 1 of the transmission case 2
The above-mentioned traveling speed change mechanism 20 disposed in the interior 9 will be described. FIG. 6 is a developed plan sectional view showing the configuration of the transmission system inside the transmission case.

That is, as shown in FIG. 6, the HST 12 is provided with a trunnion lever 12a for changing the rotation direction and the rotation speed of the output shaft 52. The trunnion lever 12a is provided with a wire, a link mechanism or the like. Through
It is linked to the main shift lever 6 of the operation unit 9. The output shaft 52 of the HST 12 has a pipe-shaped deceleration output shaft 53.
Are mounted so that they cannot rotate relative to each other, and a gear 53 a is engraved on the outer peripheral surface of the reduction output shaft 53. A reduction intermediate shaft 65 is provided below the reduction output shaft 53 (upper in FIG. 6), and a gear 66 is fixed to the reduction intermediate shaft 65.
The gear 66 is engaged with the gear 53a of the reduction output shaft 53. A gear 65a is formed on the reduction intermediate shaft 65,
The gear 65a is meshed with a gear 67 fixed on a deceleration final shaft 70 loosely fitted on the deceleration output shaft 53. A sprocket 68 is integrally formed with the final deceleration shaft 70. The sprocket 68 is driven by an input sprocket 69 provided in a ball differential mechanism 55 for differentially connecting the left and right axles 3, 3 with each other. They are linked and connected via a chain 54. The ball differential mechanism 55 is provided with a differential lock mechanism 55a which is linked to the differential lock lever 8 provided on the operation unit.

With the above configuration, the power of the engine 11 input to the input shaft 18 via the input pulley 16 is HST
After the control of the rotation speed and the rotation direction is performed at 12, a reduction output shaft 53 from the output shaft 52 → a gear 53a → a gear 66 →
After being transmitted to the reduction intermediate shaft 65 and decelerated, the gear 65a
The gears are transmitted from the gear 67 to the final deceleration shaft 70, and drive the left and right axles 3.3 from the sprocket 68 via the traveling drive chain 54 and the ball differential mechanism 55.

Next, the front and rear extending portions 2 of the transmission case 2
The above-mentioned PTO speed change mechanism 29 disposed in the inside 8 will be described. That is, as shown in FIG.
An output sprocket 71 is integrally formed, and a transmission shaft 72 provided in front of the input shaft has an input sprocket 7
3 is freely rotatably fitted to the two sprockets 71.7
3 are interlocked via a PTO input chain 56.
The transmission shaft 72 has a PTO clutch slider 7.
The clutch slider 74 is provided with a pawl clutch 74a. Therefore, when the PTO clutch slider slides rightward in FIG.
4a is engaged with the input sprocket, the PTO clutch is brought into "contact", and the rotation of the input sprocket 73
The power is transmitted to the transmission shaft 72 via the O clutch slider 74. The PTO clutch slider 74 has a reverse rotation gear 7.
7 is fixed. The PTO clutch slider is linked to the main speed change lever 6 of the operation section 9 via a link mechanism, and the main speed change lever 6 is tilted in the lateral direction of the machine so that the PTO clutch can be connected and disconnected. ing.

Further, a tilling-side output sprocket 75 is formed integrally with the transmission shaft 72, and the sprocket 75 is rotatably mounted on the above-mentioned PTO shaft 21 which is rotatably supported in front of the transmission shaft 72. 76 is interlocked and connected via a low-speed normal rotation chain 61. And PTO
A forward / reverse switching clutch slider 78 is spline-fitted to the shaft 21 so as to be relatively non-rotatable and slidable in the axial direction. The forward / reverse switching clutch slider 78 includes a tilling-side input claw clutch 78a and a mowing-side input gear 78b. Provided.

With the above configuration, when the forward / reverse switching clutch slider 78 slides rightward in FIG. 6, the engagement between the reverse rotation gear 77 and the mowing side input gear 78b is released, and the sprocket 76 is moved to the tilling side. Input claw clutch 7
8a is engaged, the rotation of the sprocket 76 is transmitted to the PTO shaft 21 via the forward / reverse switching clutch slider 78, and the rotary shaft 25 rotates forward at a low speed to perform the tilling operation. On the other hand, when the forward / reverse switching clutch slider slides to the left in FIG. 6, the engagement between the sprocket 76 and the tilling-side input pawl clutch 78a is released,
The reverse rotation gear 77 and the mowing side input gear 78b mesh with each other, and the rotation of the reverse rotation gear 77 is transmitted to the PTO shaft 21 via the forward / reverse switching clutch slider 78, thereby rotating the rotary shaft 25 at a high speed. The mowing work is performed.

That is, the power transmitted from the input shaft 18 to the PTO output sprocket 71 → the PTO input chain 56 → the input sprocket 73 → the PTO clutch slider 74 is branched into two parts, one of which is the transmission shaft 72 → the sprocket 75 → low speed. The transmission is performed while reducing the speed from the forward rotation chain 61 to the sprocket 76, and the other is accelerated by the reverse rotation gear 77 and forward / reverse conversion of the rotation direction is performed. And sprocket 7
6 or the power of the reverse rotation gear 77 is alternatively input to the forward / reverse switching clutch slider 78 to transmit the low-speed forward or high-speed reverse power to the PTO shaft 21.

Also, as shown in FIG.
1 is inserted into one side of the pipe members 99, 99 and protrudes into the transmission case 22. A sprocket 90 is attached to the protruding portion, and a base shaft 91 is attached to the rotary shaft 25 of the working machine. A sprocket 92 is attached via a transmission chain 63 so that the sprockets 90 and 92 are interlockingly connected.
The rotation of the shaft 21 is transmitted to the rotary shaft 25. Further, a braking member 58 is provided on the inner wall of the transmission case, and when the PTO clutch slider 77 is "disengaged", the braking member 58 is pressed against the side surface of the reverse gear 77 to perform a braking action. In particular, the cutting rotary blade 2 immediately after the PTO clutch “disconnect” operation in the mowing operation
The rotation due to the inertial force of No. 6 is quickly stopped.

Next, the layout of the operation unit 9 as a main part of the present invention will be described in detail. FIG. 7 is a side view showing a layout of each lever of the operation unit.

That is, as shown in FIG. 2, the steering handle 5 of the cultivator has a loop shape in a plan view, and both ends of the clutch lever 7 are pivotally supported on the steering handle 5, and the clutch lever 7 is also Steering handle 5 configured as a loop in plan view
To match the shape. When the clutch lever 7 is not in operation, the clutch lever 7 is erected upward by an unillustrated urging spring, and is set to a "disengaged" position indicated by reference numeral 7 'in FIG. 7, and the operator opposes the urging spring. When the clutch lever 7 is depressed to the “contact” position, the clutch lever 7 is configured so as to substantially follow the steering handle 5, and the operator grips the clutch lever 7 integrally with the steering handle 5. Is possible. The main transmission lever 6 is provided with the HST 12
The tiller is moved forward and backward and the speed is adjusted by tilting forward and backward. In this embodiment, the lever 6 is further moved by a PT in the PTO transmission mechanism 29.
The PTO clutch is linked to the O-clutch slider 74 and is also used for connecting and disconnecting the PTO clutch. The PTO clutch is set to “closed” when tilted to the left, and the PTO clutch is set to “disconnected” when tilted to the right. I have. The differential lock lever 8 is arranged at the center of the fuselage so that it can be easily operated from either the left or right.
Is tilted forward to a "straight forward" position 8s, the differential lock mechanism 55a is activated to prevent slippage of one of the running wheels 1, and tilted rearward to a "turn" position 8t. , The differential lock mechanism 55a
Is released so that turning can be performed smoothly.

As shown in FIG. 7, when the clutch lever 7 is at the "disengaged" position 7 ', the main shift lever 6 and the clutch lever 7 are arranged so as to at least partially overlap in a side view. It is doing. With this configuration, when the clutch lever is in the “disengaged” position 7 ′, the clutch lever 7 can hinder the operation of the main speed change lever 6 and provide a layout in which the main speed change lever is disengaged. 6 is configured to prevent erroneous operation.

The clutch lever 7 is in the "disengaged" position 7 'and the differential lock lever 8 is in the "straight-forward" position 8s.
, The differential lock lever 8 and the clutch lever 7
Are arranged so as to at least partially overlap in side view. With this configuration, the clutch lever is moved to the "disengaged" position 7 '.
In the case of, it is possible to provide a layout in which the clutch lever 7 is in the way and it is difficult to operate the differential lock lever 8,
The configuration is such that an erroneous operation of operating the differential lock lever 8 with the clutch 13 disengaged is prevented.
In this embodiment, the clutch lever 7 overlaps the clutch lever 7 in side view only when the differential lock lever 8 is at the "straight-forward" position 8s, and does not overlap the clutch lever 7 in side view when it is at the "turn" position 8t. However, a configuration in which the clutch lever 7 overlaps with the clutch lever 7 in a side view even at the "turning" position 8t is also possible, and is not limited to the above embodiment.

Next, a description will be given of the structure of the main transmission lever 6 which is also used for connecting and disconnecting the PTO clutch. 8 is a plan view of the operation unit, FIG. 9 is a plan view of the steering handle (an operation table is not shown), FIG. 10 is a rear view of the operation unit, FIG. 11 is a right side view of the operation unit, and FIG. FIG. 13 is an enlarged view of a main part, showing a wire cable.

As shown in FIG. 8 and FIG. 9, a pipe 132 is provided laterally on the steering handle 5 in the left-right direction. The main shift lever 6 of the operation unit 9
The operation console 130 on which the components are arranged is mounted. Operation console 13
As shown in the figure, reference numeral 0 is mounted on two support plates 131 fixed to a pipe 132, and the main shift lever 6, the differential lock lever 8 and the like are arranged on the operation table 130. I have. The differential lock lever 8 is connected to the operation console 1
On the upper side 30, the steering wheel 5 is located at the center side in the left-right direction of the steering handle 5. Thus, the operator can operate the differential lock lever 8 with either the left or right hand, and when the steering handle 5 has a loop shape as in the present embodiment, the operator operates with the left and right sides of the handle. In some cases, however, the differential lock lever 8 is easy to operate, thus improving workability.

As shown in FIGS. 8 and 10, the lever shaft 6a of the main transmission lever 6 extends downward through a lever guide hole 140 provided in the operation table 130.
The lower part is bent to the right, and the wire support plate 14
1 is fixed. As shown in FIG. 8, the lever guide hole 140 has a main transmission guide hole 140a for a speed change operation for controlling the rotation direction and the number of rotations of the HST 12, and a work guide hole 140b for a mowing operation and a tilling operation, respectively. Are arranged. When the main shift lever 6 is in the neutral position 140N in the main shift guide hole 140a, the HST
12 to shut off the cultivator, neutral position 14
The forward speed is increased by tilting forward from 0N, and the reverse speed is increased when tilting backward from the neutral position 140N. The neutral position 140N and the rear end of the work guide hole 140b are connected to form a PTO clutch switching path 140c. Since the work guide hole 140b is formed only in front of the connecting portion of the PTO clutch switching path 140c, the speed is not shifted to the reverse when the PTO clutch is "contacted".
The length of the work guide hole 140b in the front-rear direction is made shorter than the main speed change guide hole 140a so that an appropriate work speed (hereinafter referred to as work speed) can be secured so as not to run at high speed during work. I have.

Further, the wire support plate 141 is provided as shown in FIG.
As shown in FIG. 12 to FIG. 12, two discs are joined together, and the outer peripheral ends thereof are bent outward to form a wire groove having a substantially V-shaped cross section on the outer peripheral portion of the wire support plate 141. 141a. Then, the wire cable 144 is wound around the wire groove 141a,
The wire cable 144 is fixed at a fixing point 141b on the rear end side of the wire support plate 41a.
1u · 141d toward the front and downward, the wire cable 1
44 are extended. Then, the wire cable 144
Are the wire support portions 142u of the bracket 142 described later.
142d, the outer wires 144a.
The HST1 is mounted on the HST1
The HST 12 is connected to the second trunnion lever 12a to control the rotation speed and rotation direction of the HST 12.

Further, as shown in FIG.
The end of the lever shaft 6a to which the wire shaft 1 is fixed is further extended, penetrates a bracket 142 provided on the right side of the wire support plate 141, and supports the bracket 142 with a friction member, a bolt or the like. The lever shaft 6a is configured to be rotatable relative to the bracket 142 while giving some resistance. The bracket 142 is a substantially L-shaped member in plan view composed of a front plate 142a and a side plate 142b, and a rear end of the side plate 142b is rotatably supported by the lever shaft 6a. On the other hand, as shown in FIGS. 8 and 9, a support bracket 133 is attached to the pipe 132 between the support plates 131. The support bracket 133 is a substantially U-shaped member in a plan view, and includes plates 133f and 133r before and after the support bracket 133.
Are projected upward, and are attached so as to sandwich the pipe 132 from the front and rear at the projected portion. Then, as shown in FIG.
3 extends downward from the pipe 132, and at a lower portion thereof, the pipe 1 extends between the front and rear plates 133f and 133r.
34b is supported and fixed, and a rotation fulcrum pin 134a is rotatably inserted into the pipe 134b. The front plate 142a of the bracket 142 is fixed to the rear end of the pivot pin 134a.

With the above construction, the main shift lever 6, the wire support plate 141, and the bracket 142 are
It is possible to rotate integrally with the center 4a in the direction of arrow R3 shown in FIG. Further, by tilting the main shift lever 6 in the front-rear direction, the main shift lever 6 and the wire support plate 141 are pivoted about the fixed portion of the main shift lever 6 and the wire support plate 141 as shown in FIGS. It rotates in the direction of arrow R6 in FIG. Thereby, the wire cable 1
The operation on the trunnion lever 12a of 44 is performed,
The rotation speed and rotation direction of the HST 12 can be adjusted.

As described above, the wire cable 144 for operating the HST 12 includes a wire support plate 141 supporting the inner cable 144 and a bracket 142 supporting the outer wire 144a.
It is integrated as a unit. This prevents the wire cable 144, which is the main transmission wire, from being twisted by the PTO clutch operation, thereby ensuring the reliability of the main transmission operation. Further, as shown in FIG. 13, in this embodiment, two wires are connected to one wire cable 144.
Since the configuration is such that the outer wires 144a are set, the number of parts can be reduced by reducing the number of parts by reducing the number of parts to one by using the wire cable 144, which was conventionally required two.

The side plate 142 of the bracket 142
A pin 143 protrudes in a direction substantially perpendicular to the side surface of the side plate 142b, and extends to the right side of the side plate 142b. On the other hand, a support shaft 135 is provided on the right side of the pipe 134b attached to the lower portion of the support bracket 133.
Is fixed. The support shaft 135 is, as shown in FIG.
The left end is fixed to the pipe 134b, the front side is fixed to the front plate 133f of the support bracket 133, and extends rightward.
Is loosely fitted. An interlocking plate 1 for interlocking the main transmission lever PTO clutch is provided at the right end of the rotary pipe 150a.
50 is fixed. As shown in FIGS. 11 and 12, the interlocking plate 150 is a plate having a substantially triangular shape in a side view, and a guide groove 150b is formed in a rear portion thereof, and the bracket 142 is formed in the guide groove 150b.
The pin 143 protruding from is inserted.

With the above configuration, the main shift lever 6 is moved to the position shown in FIG.
In the case of turning in the direction of arrow R4 at 0 and moving from the main transmission guide hole 140a side to the work guide hole 140b side via the PTO clutch switching path 140c, the rotation fulcrum pin 134a is Lever shaft 6 in the center
a, wire support plate 141, bracket 142, pin 14
3 integrally rotates upward in the figure in the direction of arrow R3. As a result, the pin 143 is rotated upward in the direction of arrow R3 in the state locked in the guide groove 150b of the interlocking plate 150, and the interlocking plate 150 is rotated by the pivotal movement of the pin 143. Fig. 1
1 and in the direction of arrow R5 in FIG. The wire cable 106, which is a cable for operating the PTO clutch mechanism described above, is connected to the front lower portion of the interlocking plate 150.
0, the wire cable 106 is moved rearward (FIG. 1).
1 and to the right in FIG.
The switching of the TO clutch “contact” is performed.

As described above, in this embodiment, HST1
The main speed change lever 6 for controlling the vehicle speed by controlling the number of rotations and the rotation direction of the motor 2 is also used as an operation lever for switching connection / disconnection of the PTO clutch. For this reason, the operation is simple and the workability is good, and the number of levers of the operation unit 9 can be reduced, so that the operation unit 9 can be made compact and the cultivator can be downsized. During the traveling movement of the cultivator, the state of the PTO clutch “disengaged” is maintained, and in the state of the PTO clutch “closed”, the above-described operation speed can be maintained. It is possible. Further, as described above, the operation of the main shift lever 6 toward the “contact” side of the PTO clutch can always be operated only when the main shift lever 6 passes through the neutral position 140N in the main shift guide hole 140a. Therefore, it is possible to prevent erroneous operation such as erroneous operation of the PTO clutch “connection” during high-speed movement and the like, thereby enabling stable work.

Since the wire cable 106 is constantly urged to the clutch "disengaged" side by the spring force of the above-mentioned PTO clutch mechanism, the urging force causes the wire cable 106 to move forward (to the left in FIGS. 11 and 12). Direction). As a result, the interlocking plate 150 rotates in the direction opposite to the direction of arrow R5, so that the pin 143 protruding from the bracket 142 is rotated downward, and the main speed change lever 6 is moved to the right in FIG. That is, it is tilted toward the main transmission guide hole 140a. With such a configuration, the main transmission lever 6 does not switch in the direction of “contact” of the PTO clutch due to an unintended operation of the operator, and erroneous operation can be prevented, and workability can be stably improved. I try to keep it.

The main transmission lever 6 is connected to the work guide hole 1.
When the tilting operation is performed in the front-rear direction in the inside of the main transmission lever 40, the main transmission lever 6 is moved to the neutral position 140N of the main transmission guide hole 140.
Since the tilting operation is performed only on the front side, the operation can be stably performed without being operated by mistake on the reverse side during the operation. The tilting operation of the main shift lever 6 in the main shift guide hole 140 and the tilting operation of the work guide hole 140b are performed in the side view because the rotation axis is located on the extension of the straight portion of the lever. The operability is good because the protrusion length of the lever from the lever guide does not change due to the tilting.

As shown in FIG. 8, a locking guide 140S is provided on the left side of the work guide hole 140b slightly forward of the center in the front-rear direction. By providing this locking guide 140S, the PTO clutch “contact”
In order to tilt the main shift lever 6 toward the high speed side in the state of (1), the operator must actively perform the operation of tilting the main shift lever 6 forward while avoiding the locking guide 140S. The workability was improved without accidentally increasing the vehicle speed during the tilling work performed in the forward rotation. In this manner, the main transmission lever 6 is connected to the locking guide 1.
Tilling work by operating on the front side of 40S,
The mowing operation is performed by operating the locking guide 140S on the front side.

[0047]

The present invention is configured as described above.
The following effects are obtained.

That is, as described in claim 1, the clutch lever which is linked to the clutch for connecting and disconnecting the power of the cultivator and which is brought into the "contact" position by grasping integrally with the steering handle having a loop shape in plan view is operated. In a cultivator having a configuration having an operation unit for performing a traveling operation in an operation unit, when the clutch lever is at the “disengaged” position, the operation unit and the clutch lever at least partially overlap in a side view. When the clutch lever is in the "disengaged" position, the clutch lever is in the way and the operating means is difficult to operate, so the operating means is operated with the hand released from the clutch lever. Inadvertent erroneous operation is prevented.

According to the second aspect of the present invention, since the operating means is the main shift operating means, when the clutch lever is in the "disengaged" position, the clutch lever is in the way and it is difficult to operate the main shift operating means. With this configuration, an erroneous operation of operating the main shift operation unit with the hand released from the clutch lever is prevented.

Since the operating means is a differential lock operating means, when the clutch lever is in the "disengaged" position, the clutch lever interferes and the differential lock operating means is difficult to operate. Therefore, an erroneous operation of operating the differential lock operating means with the hand released from the clutch lever is prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a cultivator according to one embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view showing a configuration of a working machine attached to a front part of the cultivator.

FIG. 4 is a plan view of the same.

FIG. 5 is a partial cross-sectional side view showing a mounting configuration of a rotary blade in a work machine.

FIG. 6 is a developed plan sectional view showing the configuration of a transmission system inside the transmission case.

FIG. 7 is a side view showing a layout of each lever of the operation unit.

FIG. 8 is a plan view of an operation unit.

FIG. 9 is a plan view of a steering handle. However, the operation console is not shown.

FIG. 10 is a rear view of the operation unit.

FIG. 11 is a right side view of the operation unit.

FIG. 12 is an enlarged view of a main part in the same manner.

FIG. 13 is a view showing a wire cable.

[Explanation of symbols]

 Reference Signs List 5 Steering handle 6 Main shift lever (Main shift operating means) 7 Clutch lever 8 Diff lock lever (Diff lock operating means) 9 Operating section 13 Clutch (belt tension clutch)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiromitsu Hayata 1-32 Chaya-cho, Kita-ku, Osaka-shi, Osaka F-term in Yanmar Agricultural Machinery Co., Ltd. 2B033 AA06 AB01 AB11 AB18 AC05 AC08 BA01 BB04 BB08 BC03 BC12 CA21 CA22 CA32 DA01 DA02 DB03 ED01 ED04

Claims (3)

[Claims] An operation unit includes a clutch lever which is linked to a clutch for connecting and disconnecting the power of a cultivator and is brought into a “contact” position by being integrally gripped with a steering handle having a loop shape in a plan view to perform a traveling operation. In the cultivator having the configuration in which the operation unit is provided in the operation unit, when the clutch lever is at the “disengaged” position, the operation unit and the clutch lever are arranged so as to at least partially overlap in a side view. Tiller. 2. The cultivator according to claim 1, wherein said operation means is a main speed change operation means. 3. The cultivator according to claim 1, wherein said operating means is a differential lock operating means.