JP7098491B2 - Tractor - Google Patents

Description

The present invention relates to a tractor.

Conventionally, a tractor disclosed in Patent Document 1 is known.
The tractor disclosed in Patent Document 1 has a marker member for marking a field. The marker member is attached to the outward side in the vehicle width direction of the rotating rod that projects outward in the vehicle width direction from the front end surface of the step provided on the vehicle body. The rotary rod is rotatably attached to the front end surface of the step around the center of the horizontal axis extending in the vehicle width direction.

By rotating the rotating rod around the center of the horizontal axis, the marker member can be displaced from the action position where the marker is attached to the ground to the lifting position away from the field. The rotary rod abuts on the front end surface of the step and is pressed against the front end surface of the step by the urging force of the spring in the first state where the marker member is located at the action position and the second state where the marker member is located at the lifting position. , Is held in the first state and the second state. That is, the marker member is held at the action position and the lifting position by the urging force of the spring.

Japanese Unexamined Patent Publication No. 56-138509

In the tractor disclosed in Patent Document 1, since the marker member is held at the acting position and the lifting position by the urging force of the spring, there is a possibility that the marker member is accidentally displaced from the acting position to the lifting position.
Therefore, an object of the present invention is to provide a tractor capable of preventing the marker member from being accidentally lifted from the working position to the lifting position.

The tractor according to one aspect of the present invention includes a travelable vehicle body, an arm support shaft supported on the vehicle body side, and a portion protruding outward in the vehicle width direction from the vehicle body side and inward in the vehicle width direction. Is pivotally supported by the arm support shaft so that the outer side portion in the vehicle width direction can swing up and down around the arm support shaft, and the support arm is supported by the outer side portion in the vehicle width direction. The support arm swings upward around the arm support axis so that the marker member can be displaced from the action position where the mark is attached to the field to the lifting position away from the field, and the marker member acts. A lock member is provided above the support arm when in position to regulate the upward swing of the support arm, and the lock member is in a locked state that regulates the upward swing of the support arm. By swinging downward from, it is possible to displace to the unlocked state retracted from the upper position of the support arm.

Further, the lock member is provided with a first urging member that automatically returns the lock member from the unlocked state to the locked state, and the support arm is swung downward from the state where the marker member is in the lifted position. When the support arm presses the lock member in the locked state, the lock member swings downward against the urging force of the first urging member, and the marker member is displaced to the action position.
Further, the lock support shaft that pivotally supports the lock member so as to be able to swing up and down, the first regulating portion that regulates the upward swing of the lock member in the locked state but allows the downward swing, and the lock member. It includes a first urging member that urges in a direction that swings upward.

Further, the support arm is provided with a support attached to a portion on the outer side in the vehicle width direction of the support arm. The marker arm, the second restricting portion that regulates the forward swing of the marker arm when the marker member is in the action position but allows the rear swing, and the urging in the direction of swinging the marker arm forward. It has a second urging member.

Further, the tractor has a travelable vehicle body, an arm support shaft supported on the vehicle body side, and a portion protruding outward in the vehicle width direction from the vehicle body side and having an inward side portion in the vehicle width direction is the arm support shaft. A support arm that is pivotally supported by the vehicle width direction outer side portion can swing up and down around the arm support axis, and the support arm is supported by the vehicle width direction outer side portion of the support arm, and the support arm is said. A marker member that can be displaced to a lifting position away from the field by swinging upward around the arm support axis to make a mark by touching the field, and when the marker member is in the working position. A lock member located above the support arm to regulate the upward swing of the support arm, a mounting body attached to the vehicle body, and a marker member mounted on the mounting body from the action position. A lifting mechanism for lifting to a lifting position is provided, and the lifting mechanism includes a lift arm that is swingably supported around the center of the horizontal axis, an interlocking member that interlocks and connects the lift arm and the support arm, and the lift arm. An operating member that swings the support arm up and down by swinging the marker member at a first position for positioning the marker member at the action position and a second position for positioning the marker member at the lifting position. It has a displaceable operating member, the operating member abuts on the mounting body at the first position and the second position, and the weight of the support arm and the marker member makes the operating member the mounting body. It can be held in the first position and the second position by acting in the direction of contacting the body.

Further, the support arm is fixed to the main arm that is pivotally supported on the arm support shaft so as to be vertically swingable, the first member that is attached to the main arm so that the position can be adjusted in the vehicle width direction, and the first member. It also has a mounting member including a second member in which the marker member is supported so that the vertical position can be adjusted.
Further, the lops attached to the vehicle body and a marker device attached to the lops, including at least one marker member, a support arm, and a lock member, are provided.

Further, the marker device includes the left marker member, the left support arm and the left lock member provided on the left side of the center of the vehicle body in the vehicle width direction, and the marker device on the right side of the center of the vehicle body in the vehicle width direction. The marker member on the right, the support arm on the right, and the lock member on the right are included.
Further, the position detection device for detecting the position of the vehicle body, the steering device for steering the vehicle body, and the steering of the steering device are automatically controlled and set based on the detection value acquired by the position detection device. The marker member includes a control device for traveling the vehicle body along the planned travel route, and the marker member provides a mark as a guide for determining the position of the vehicle body when starting travel along the planned travel route.

According to the above configuration, by restricting the upward swing of the support arm by the lock member, it is possible to prevent the marker member from being accidentally lifted from the action position to the lift position.

It is a side view of a tractor. It is a rear view of the left half of the tractor. It is a rear perspective view with the marker device attached to the rops. It is a perspective view of Lopse. It is a figure which shows the structure of the tractor and the control block diagram. It is a rear perspective view of a support frame. It is a front view of a support frame. It is sectional drawing of the support arm. It is a rear view of a support. It is a side view of a marker body. It is a rear view of a part of a marker device. It is a perspective view of the mounting part of the operation lever. It is a side view of the mounting part of the operation lever. It is a side view of a lock mechanism. It is a front view of the lock mechanism. It is a side view which shows the operation of a lock mechanism. It is a schematic diagram explaining the setting of the planned travel route of a straight line route.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a side view showing a tractor 1 according to the present embodiment.
In the present embodiment, the direction of arrow A1 in FIG. 1 (forward direction of tractor 1) is referred to as forward, the direction of arrow A2 in FIG. 1 (backward direction of tractor 1) is referred to as backward, and the direction of arrow A3 in FIG. .. Therefore, the front side of FIG. 1 is on the left side, and the back side of FIG. 1 is on the right side. Further, the horizontal direction orthogonal to the front-rear direction A3 will be described as the vehicle width direction B3 (see FIG. 2). The direction from the central portion of the vehicle width direction B3 in the tractor 1 toward the right portion or the left portion will be described as the vehicle width direction outer side B1. In other words, the vehicle width direction outer side B1 is the vehicle width direction B3 and is a direction away from the center of the tractor 1. The direction opposite to the outer B1 in the vehicle width direction will be described as the inner B2 in the vehicle width direction. In other words, the vehicle width direction inward B2 is the vehicle width direction B3 and is a direction approaching the center of the tractor 1.

As shown in FIG. 1, the tractor 1 has a traveling device 2 and a vehicle body 3 movably supported by the traveling device 2.
In the present embodiment, the traveling device 2 is a wheel-type traveling device 2 having a plurality of front wheels 8 and a plurality of rear wheels 9. The plurality of front wheels 8 include a left front wheel 8L arranged on the left side of the vehicle body 3 and a right front wheel 8R arranged on the right side of the vehicle body 3. The plurality of rear wheels 9 include a left rear wheel 9L arranged on the left side of the vehicle body 3 and a right rear wheel 9R arranged on the right side of the vehicle body 3. The traveling device 2 may be a full crawler type traveling device or a semi-crawler type traveling device. The full crawler type traveling device is a crawler type traveling device provided from the front portion to the rear portion of the vehicle body 3. The semi-crawler type traveling device 2 is a traveling device having a front wheel 8 and a crawler type traveling mechanism adopted in place of the rear wheel 9.

The vehicle body 3 has, for example, a prime mover 4, a clutch housing 5, a connecting frame 6, and a mission case 7. The prime mover 4 is, for example, an engine, more specifically, a diesel engine. The clutch housing 5 is connected to the rear part of the prime mover 4. The clutch housing 5 houses a flywheel that reduces and stabilizes a change in the rotational force of the prime mover 4, and a clutch that intermittently transmits the power of the prime mover 4 transmitted via the flywheel. The connecting frame 6 connects the clutch housing 5 and the transmission case 7. The mission case 7 accommodates a transmission that shifts the power transmitted via the clutch.

A driver's seat 10 on which an operator (driver) is seated is mounted on the rear portion of the vehicle body 3. The driver's seat 10 is provided between the rear wheels 9L and the rear wheels 9R. In front of the driver's seat 10, a steering handle 11 for steering the steering wheel (front wheel 8 in the present embodiment) is provided. At the rear of the vehicle body 3, a mounting device such as a three-point link mechanism 41 for mounting a working machine (implement) detachably is provided. The three-point link mechanism 41 has one top link 41A and two lower links 41B.

As shown in FIG. 1, a rops (mounting body) 12 is provided behind the driver's seat 10. The rops 12 are attached to the vehicle body 3.
As shown in FIG. 4, the rops 12 has a rops body 13 and a mounting frame 14. The rops main body 13 has a plurality of columns 13A and a connecting portion 13B. The plurality of columns 13A include a left column (first column) 13L and a right column (second column) 13R. The connecting portion 13B connects the upper portions of the first strut 13L and the second strut 13R to each other.

As shown in FIG. 4, the mounting frame 14 has a left frame body 14L, a right frame body 14R, and a connecting frame body 14A that connects the upper portions of the left frame body 14L and the right frame body 14R. The left frame body 14L is arranged on the left side of the rear part of the vehicle body 3, and the lower part is attached to the left side of the mission case 7 by bolts or the like (see FIG. 2). The right frame body 14R is arranged on the right side of the rear part of the vehicle body 3, and the lower part is attached to the right side of the mission case 7 by bolts or the like. A mounting bracket 15L is erected and fixed on the upper portion of the left frame body 14L, and a bolt 16L on which the first support column 13L has a horizontal axis (an axis extending in the vehicle width direction B3) is attached to the mounting bracket 15L. Attached by. A mounting bracket 15R is erected and fixed to the upper portion of the right frame body 14R, and a second support column 13R is attached to the mounting bracket 15R by a bolt 16R having a horizontal axis. The rops main body 13 is restricted from tilting backward by the lock member 30, and can be tilted backward around the axis of the bolts 16L and 16R by releasing the lock by the lock member 30.

As shown in FIG. 5, the tractor 1 has a steering device 17. The steering device 17 includes a steering handle 11, a steering shaft 18 that rotates with the rotation of the steering handle 11, and an auxiliary mechanism (power steering mechanism) 19 that assists the steering of the steering handle 11. The auxiliary mechanism 19 includes a hydraulic pump P1, a control valve 20 to which hydraulic oil discharged from the hydraulic pump P1 is supplied, and a steering cylinder 21 operated by the control valve 20. The control valve 20 is a solenoid valve that operates based on a control signal, and is, for example, a three-position switching valve that can be switched by moving a spool or the like. The control valve 20 can also be switched by steering the steering shaft 18. The steering cylinder 21 is connected to an arm (knuckle arm) 22 that changes the direction of the front wheels 8L and 8R.

When the steering handle 11 is operated, the switching position and opening degree of the control valve 20 are switched according to the operation of the steering handle 11, and the piston rod of the steering cylinder 21 is changed according to the switching position and opening degree of the control valve 20. Move to the left or right. As a result, the steering direction (steering direction) of the front wheels 8 can be changed. The steering device 17 described above is an example, and is not limited to the configuration described above.

As shown in FIGS. 1 and 3, the tractor 1 includes a position detecting device 23 for detecting the position (traveling position) of the tractor 1 (vehicle body 3). In this embodiment, the position detecting device 23 is attached to the rops 12. Specifically, it is attached to the central portion of the connecting portion 13B of the rops main body 13 via the stay member 24.
The position detection device 23 is a device that detects its own position (positioning information including latitude and longitude) by a satellite positioning system. That is, the position detection device 23 receives signals transmitted from the positioning satellite (position of the positioning satellite, transmission time, correction information, etc.), and detects the position (latitude, longitude) based on the received signals. The position detection device 23 may detect the corrected position based on the correction signal from the base station (reference station) capable of receiving the signal from the positioning satellite as its own position (latitude, longitude). .. Further, the position detection device 23 may have an inertial measurement unit such as a gyro sensor or an acceleration sensor, and may detect the position corrected by the inertial measurement unit as its own position.

As shown in FIG. 5, the tractor 1 includes a control device 25.
The position detection device 23, the travel detection device 26 of the travel system, and the work detection device 27 of the work system are connected to the control device 25. Therefore, the control device 25 can acquire the position detected by the position detection device 23, the detection value detected by the travel detection device 26, and the detection value detected by the work detection device 27. The travel detection device 26 is, for example, a crank sensor, a cam sensor, an engine rotation sensor, an accelerator sensor, a vehicle speed sensor, a steering angle sensor, or the like. The work detection device 27 is, for example, a lever detection sensor, a PTO rotation sensor, or the like.

The control device 25 controls the traveling system and the working system in the tractor 1. The control device 25 controls, for example, the rotation speed of the prime mover 4 (engine), the vehicle speed, the steering angle of the steering device 17, and the like based on the detection value detected by the travel detection device 26. Further, the control device 25 controls the elevating device for raising and lowering the work machine mounted on the tractor 1, the PTO rotation speed, and the like, based on the detection value detected by the work detection device 27.

The control device 25 has a steering control unit 28. The steering control unit 28 includes electrical and electronic components provided in the control device 25, a program incorporated in the control device 25, and the like.
The steering control unit 28 (control device 25) can automatically control the steering of the tractor 1 (auto steering control) based on the set planned travel route (scheduled travel route) R1 (see FIG. 17). As shown in FIG. 5, the tractor 1 has, for example, a switch (command switch) 31 for enabling or disabling auto-steering control. The command switch 31 is connected to the control device 25. The command switch 31 is a switch that can be switched ON / OFF, and enables auto-steering control when it is ON and disables auto-steering control when it is OFF. Further, the command switch 31 is installed in the vicinity of the driver's seat 10 and can be operated by the operator.

When the auto steering control is enabled, the steering control unit 28 makes sure that at least the traveling position (position detected by the position detecting device 23) of the tractor 1 (vehicle body 3) and the planned traveling route R1 match, that is, The switching position and opening degree of the control valve 20 are set so that the vehicle body 3 and the planned travel route R1 match. In other words, when the auto steering control is effective, the control device 25 moves the piston rod of the steering cylinder 21 in the moving direction and the moving amount (of the front wheels 8) so that the traveling position of the tractor 1 and the planned traveling route R1 match. Steering direction and steering angle) are set.

Specifically, when the auto steering control is enabled, the steering control unit 28 uses the traveling position of the tractor 1 (vehicle body 3) detected by the position detecting device 23 and the position indicated by the planned traveling route R1 (planned traveling position). ), And if the traveling position and the planned traveling position match, the steering angle and steering direction (steering angle and steering direction of the front wheels 8) of the steering handle 11 in the steering device 17 are held unchanged. (Maintain the opening and switching position of the control valve 20 without changing). Further, when the traveling position and the planned traveling position do not match, the steering control unit 28 has a steering handle 11 in the steering device 17 so that the deviation (deviation amount) between the traveling position and the planned traveling position becomes zero. The steering angle and / or the steering direction of the control valve 20 is changed (the opening degree and / or the switching position of the control valve 20 is changed).

When the auto steering control is invalid, the steering control unit 28 determines the steering direction, steering angle, vehicle speed, etc. of the front wheels 8 based on the operator's operation (operation of the steering wheel 11 by the operator, operation of the accelerator of the operator, etc.). Set. That is, the operator can manually change the direction of the tractor 1 (vehicle body 3) by the steering control unit 28.
As shown in FIG. 5, the tractor 1 includes a display device 32. The display device 32 is arranged, for example, in the vicinity of the driver's seat 10. The operator can visually recognize and operate the display device 32 while seated in the driver's seat 10. The display device 32 is a device capable of displaying various information, and has a display unit (screen) 33 composed of a liquid crystal panel, a touch panel, and the like.

The display device 32 has a reference line setting unit 36 and a travel setting unit 34. The reference line setting unit 36 and the travel setting unit 34 are composed of electrical / electronic parts provided in the display device 32, a program incorporated in the display device 32, and the like. The reference line setting unit 36 sets a reference line K1 (see FIG. 17) that serves as a reference during traveling. The travel setting unit 34 sets the travel of the tractor 1. As shown in FIG. 17, the travel setting unit 34 sets the planned travel route R1 of the tractor 1 (vehicle body 3) based on the reference line K1 set by manual travel. The display unit 33 (display device 32) can display the planned travel route R1.

The display device 32 has a storage unit 35. The storage unit 35 is a non-volatile memory or the like.
The above tractor 1 can be driven along the planned travel route R1 by automatically steering the vehicle body 3 based on the planned travel route R1 by the auto steering control by the steering control unit 28.
Next, the setting of the reference line K1 will be described with reference to FIG.

FIG. 17 shows a case where the reference line K1 of the straight path is set.
When setting the reference line K1, first, the tractor 1 is positioned at the work start position D1 in the field, and the route setting button 37 (see FIG. 5) displayed on the display device 32 is pressed. Then, the start point C1 is stored (registered) in the storage unit 35 as the position information acquired by the satellite positioning system. Next, the tractor 1 is manually driven straight and the work is performed by the work machine 38, and the route setting button 37 is pressed at the work end position D2 at the end of the field. Then, the end point C2 is stored (registered) in the storage unit 35 as position information, and the straight line reference line K1 connecting the start point C1 and the end point C2 is stored (registered) in the storage unit 35.

Next, the tractor 1 is manually operated from the work end position D2 to the unworked area (working area where the work has not been performed yet) next to the work area (existing work area) where the work has already been done (for example, cultivated or ridged). When the command switch 31 is pressed after turning, the planned travel route R1 parallel to the reference line K1 is set, and the auto steering control of the vehicle body 3 is performed based on the planned travel route R1.

The working machine 38 is raised when the tractor 1 is turned, and the working machine 38 is lowered when the work is performed. However, the working machine 38 may be raised or lowered automatically or manually. You may.
When the tractor 1 reaches the end of the planned travel route R1, the auto steering control is canceled. Therefore, after turning the tractor 1 manually to the uncultivated land side, pressing the command switch 31 is based on the planned travel route R1. The auto steering control can be restarted.

The above-mentioned work by setting the planned travel route R1 and the auto steering control based on the planned travel route R1 is an example and is not limited.
As shown in FIG. 1, the tractor 1 is provided with a marker device 46 for marking a field (field scene). In this embodiment, the marker device 46 is attached to the rops 12. Further, the marker device 46 is formed symmetrically with respect to the center line CL (see FIG. 2) extending in the vertical direction in the center of the vehicle width direction B3 of the tractor 1.

As shown in FIG. 3, the marker device 46 includes a support frame 47, a plurality of support arms 48, a plurality of marker bodies 49, a plurality of lifting mechanisms 50, and a plurality of locking mechanisms 51.
First, the support frame 47 will be described.
As shown in FIGS. 6 and 7, the support frame 47 is attached to the rops 12. The support frame 47 has a plurality of attachments 52 and a connecting member 53. The plurality of attachments 52 include a left attachment (first attachment) 52L attached to the lower part of the first support column 13L and a right attachment (second attachment) 52R attached to the lower part of the second support column 13R. including. The fixture 52 has a first plate 54, a second plate 55, a third plate 56, and a guide rod (guide member) 57.

The first plate 54 and the second plate 55 are attached to the support column 13A by sandwiching and connecting the support column 13A. Specifically, the first plate 54 is arranged on the outer side B1 in the vehicle width direction of the lower part of the support column 13A, and the second plate 55 is arranged on the inner side B2 side in the vehicle width direction of the lower part of the support column 13A. The first plate 54 and the second plate 55 are connected by a plurality of fasteners 58. The fastener 58 includes a spacer member 58a made of a tubular member provided between the first plate 54 and the second plate 55, and a bolt member 58b through which the first plate 54, the second plate 55 and the spacer member 58a are inserted. It has a nut member 58c that is screwed (fitting a male screw and a female screw) to the bolt member 58b.

As shown in FIGS. 6 and 7, the third plate 56 is fixed to the side surface of the second plate 55 on the inner side B2 side in the vehicle width direction so that the plate surface faces the front and back. Specifically, the third plate 56 has a vertical plate portion 56a whose upper portion is fixed to the rear portion of the second plate 55 and protrudes downward from the second plate 55, and an inward B2 in the vehicle width direction from the lower end of the vertical plate portion 56a. It has a horizontal plate portion 56b extending to the surface.

As shown in FIG. 6, the guide rod 57 is arranged behind the vertical plate portion 56a. The guide rod 57 includes a first portion 57a arranged at a distance from the vertical plate portion 56a, and a second portion 57b extending forward from the upper end of the first portion 57a and fixed to the upper part of the vertical plate portion 56a. It has a third portion 57c extending forward from the lower end of the first portion 57a and fixed to the lower part of the vertical plate portion 56a.
The connecting member 53 is formed in a channel steel shape that opens forward by a plate material (see FIG. 14), and connects the third plate 56 of the first mounting tool 52L and the second mounting tool 52R to each other. Specifically, the left portion of the connecting member 53 is overlapped with the horizontal plate portion 56b of the first attachment 52L and fixed by a bolt or the like, and the right portion is overlapped with the horizontal plate portion 56b of the second attachment 52R and is bolted or the like. Is fixed by.

As shown in FIGS. 6 and 7, a plurality of arm support shafts 59 are provided side by side in the vehicle width direction B3 at the center of the connecting member 53 in the vehicle width direction B3. The plurality of arm support shafts 59 have a front-rear axis (an axis extending in the front-rear direction A3). The plurality of arm support shafts 59 are the left arm support shaft (first arm support shaft) 59L located to the left from the center of the vehicle width direction B3 of the connecting member 53 and the right from the center of the vehicle width direction B3 of the connecting member 53. Includes the right arm support shaft (second arm support shaft) 59R located at. As shown in FIG. 14, the arm support shaft 59 penetrates the connecting member 53 and projects rearward. A collar 60 and a boss 61 are rotatably fitted around the axis at a portion of the arm support shaft 59 protruding rearward from the connecting member 53. The collar 60 and the boss 61 are retracted from the arm support shaft 59 by a washer 62 and a retaining pin 63.

Next, the support arm 48 will be described.
As shown in FIG. 3, the plurality of support arms 48 include a left support arm (first support arm) 48L and a right support arm (second support arm) 48R. The first support arm 48L is arranged behind the lower part of the first support column 13L, and projects from the vehicle body 3 side to the outside B1 (left side) in the vehicle width direction. The second support arm 48R is arranged behind the lower part of the second support column 13R, and projects outward from the vehicle body 3 side toward B1 (right side) in the vehicle width direction. Specifically, the end of the support arm 48 on the inner B2 side in the vehicle width direction is located substantially at the center of the vehicle width direction B3 of the tractor 1, and the outer B1 side in the vehicle width direction is the vehicle width direction B3 of the rear wheel 9. It protrudes outward B1 in the vehicle width direction from the outer end. The support arm 48 has a main arm 64 that protrudes outward B1 in the vehicle width direction from the arm support shaft 59, and a mounting member 65 that is attached to the main arm 64.

As shown in FIGS. 6 and 8, the main arm 64 is formed of a pipe material, and the vehicle width direction inward side portion 64a is supported on the lops 12 side via the arm support shaft 59. Therefore, the main arm 64 can swing up and down around the arm support shaft 59 on the outer B1 side in the vehicle width direction. Specifically, the portion 64a on the inner side in the vehicle width direction of the main arm 64 of the first support arm 48L is fixed to the boss 61 rotatably fitted around the axis center of the first arm support shaft 59L. The portion 64a on the inner side in the vehicle width direction of the main arm 64 of the second support arm 48R is fixed to a boss 61 rotatably fitted around the axis center of the second arm support shaft 59R. Therefore, the arm support shaft 59 rotatably supports the inward side portion 64a of the support arm 48 in the vehicle width direction toward the vehicle body 3 side (Lopse 12 side) around the front-rear axis center. In other words, the support arm 48 is attached to the rops 12 so as to be swingable up and down around the axis of the arm support shaft 59.

As shown in FIG. 6, the main arm 64 is inserted between the vertical plate portion 56a and the guide rod 57, and can swing up and down between the upper end and the lower end of the guide rod 57. That is, the guide rod 57 guides the main arm 64 (support arm 48) in the swing direction.
As shown in FIGS. 2 and 3, the main arm 64 is provided with a set screw (referred to as a first set screw) 66 and a locking portion 67. The first set screw 66 and the locking portion 67 are provided on the outer B1 side of the main arm 64 in the vehicle width direction. Further, the first set screw 66 and the locking portion 67 are provided on the upper part of the main arm 64. The first set screw 66 is located outside B1 in the vehicle width direction of the locking portion 67.

As shown in FIG. 8, the first set screw 66 has a screw shaft portion 66a that is fitted to a nut member 68 fixed to the upper part of the main arm 64 so that it can be screwed (screwed) and screwed back (loosely). Have. The screw shaft portion 66a inserts the nut member 68 and penetrates the upper part of the main arm 64.
As shown in FIGS. 2 and 3, the mounting member 65 includes a first member 69 mounted on the main arm 64 and a second member (a portion on the outer side in the vehicle width direction) 70 fixed to the first member 69. include.

The first member 69 is attached to the main arm 64 so as to be adjustable in position in the vehicle width direction B3. Specifically, as shown in FIG. 8, the first member 69 is formed by bending a bar, and has a horizontal rod portion 69a extending in the vehicle width direction B3 and a vertical rod portion 69b extending in the vertical direction. , A curved connecting rod portion 69c that connects the horizontal rod portion 69a and the vertical rod portion 69b.
The lateral rod portion 69a is inserted into the main arm 64 from the end portion on the outer side B1 side in the vehicle width direction, is movable in the vehicle width direction B3 with respect to the main arm 64, and is rotatable around the center of the horizontal axis. .. The outer B1 side of the lateral rod portion 69a in the vehicle width direction protrudes outward from the main arm 64. A first contact surface 69d formed on a flat surface is formed on the upper portion of the horizontal rod portion 69a. The first contact surface 69d is formed long in the vehicle width direction B3. The tip (lower end) of the screw shaft portion 66a of the first set screw 66 can be brought into contact with the first contact surface 69d. The lateral rod portion 69a is restricted from moving and rotating in the vehicle width direction B3 with respect to the main arm 64 by screwing the first set screw 66 and pressing the first contact surface 69d with the screw shaft portion 66a. To. Further, by loosening the first set screw 66, the lateral rod portion 69a can be moved with respect to the main arm 64 in the vehicle width direction B3.

As shown in FIG. 8, a second contact surface 69e formed on a flat surface is formed on the lateral rod portion 69a on the outer side B1 side in the vehicle width direction and at the lower portion. The second contact surface 69e is located at a position corresponding to the first set screw 66 with the lateral rod portion 69a inserted into the main arm 64 over substantially the entire length.
As shown in FIG. 2, by pushing the horizontal screw portion 69a into the main arm 64 and rotating it by 180 ° around the center of the horizontal axis, the marker body 49 is shown by a two-dot chain line inverted upward from the usage state Y1 shown by the solid line. The marker body 49 can be displaced to the unused state Y2, and the marker body 49 is pressed by the screw shaft portion 66a by screwing the first set screw 66 in a state of being rotated by 180 °. It can be held in the unused state Y2.

As shown in FIG. 8, the connecting rod portion 69c connects the end portion of the horizontal rod portion 69a on the outer side B1 side in the vehicle width direction and the upper end portion of the vertical rod portion 69b.
As shown in FIG. 8, the second member 70 is formed of a pipe material. A vertical rod portion 69b is inserted in the upper part of the second member 70. The second member 70 is fixed to the vertical rod portion 69b. As a result, the second member 70 is fixed to the first member 69.

As shown in FIG. 2, the second member 70 is located on the outer side B1 of the rear wheel 9 (main arm 64) in the vehicle width direction, and is arranged so as to extend in the vertical direction. Further, as shown in FIG. 1, the second member 70 is located at the rear portion of the rear wheel 9. Further, the second member 70 supports the marker member 72, which will be described later, so that the vertical position can be adjusted.
As shown in FIG. 9, a set screw (referred to as a second set screw) 71 is provided at the lower portion of the second member 70. The second set screw 71 is provided on the outer side B1 side of the second member 70 in the vehicle width direction. The second set screw 71 has a screw shaft portion 71a that can be screwed and retracted into a nut member 39 fixed to the lower portion of the second member 70. The screw shaft portion 71a inserts the nut member 39 and penetrates the second member 70.

Next, the marker body 49 will be described.
As shown in FIG. 3, the plurality of marker bodies 49 include a left marker body (first marker body) 49L arranged on the left side of the tractor 1 and a right marker body (first marker body) 49L arranged on the right side of the tractor 1. Second marker body) 49R and the like. The first marker body 49L is attached (supported) to the first support arm 48L, and the second marker body 49R is attached (supported) to the second support arm 48R.

As shown in FIGS. 2 and 3, the marker body 49 has a marker member 72 that is in contact with the field to mark, and a portion (second member) on the outer side in the vehicle width direction of the support arm 48 that supports the marker member 72. It has a support 73 attached to 70).
As shown in FIG. 2, the marker member 72 is supported by the support arm 48 on the outer side B1 side in the vehicle width direction via the support 73. Further, in the marker member 72, the support arm 48 swings upward around the arm support shaft 59, so that the lifting position X2 (see the solid line) separated from the action position X1 (see the solid line) for grounding and marking the field (see the solid line). It can be displaced (position can be changed) to (see the two-dot chain line).

As shown in FIG. 10, the marker member 72 is rotatably supported around the center of the horizontal axis via a rotary support shaft 74 under the support 73. The marker member 72 is formed of a disk (rotating body) formed by spacing concave portions 75 that are concave inward in the radial direction on the outer periphery of the disk at intervals in the circumferential direction. Further, the marker member 72 is formed in a dish shape (conical shape) that is recessed toward the outer side B1 in the vehicle width direction toward the inner side in the radial direction.

As shown in FIGS. 9 and 10, the support 73 includes a mounting rod 76, a support bracket 77, a stopper member (second regulating portion) 78, a marker arm 79, and a return spring (second urging member). Has 80 and.
As shown in FIG. 9, the mounting rod 76 is formed of a bar member, and the upper portion thereof is inserted into the lower portion of the second member 70. The lower part of the mounting rod 76 projects downward from the second member 70. The mounting rod 76 is movable in the vertical direction with respect to the second member 70 and is rotatable around the center of the vertical axis (the center of the axis extending in the vertical direction). The upper part of the mounting rod 76 has a plurality of regulating surfaces 81 formed on a flat surface. The plurality of regulating surfaces 81 are a first regulating surface 81a formed on one side of the mounting rod 76 (side portion on the outer side B1 side in the vehicle width direction) and another side portion (inward in the vehicle width direction) of the mounting rod 76. It includes a second regulation surface 81b formed on the side portion on the B2 side). The tip of the screw shaft portion 71a of the second set screw 71 can be brought into contact with the regulation surface 81. The regulation surface 81 has a predetermined length in the vertical direction.

The mounting rod 76 is restricted from moving and rotating in the vertical direction with respect to the second member 70 by screwing the second set screw 71 and pressing the regulation surface 81 with the screw shaft portion 71a. Further, by loosening the second set screw 71, the mounting rod 76 is allowed to move in the vertical direction with respect to the second member 70. As a result, the position of the support 73 (mounting rod 76) can be adjusted in the vertical direction with respect to the second member 70 (support arm 48).

Further, the mounting rod 76 is allowed to rotate about the vertical axis with respect to the second member 70 by loosening the second set screw 71. Therefore, by rotating the mounting rod 76 by 180 °, the marker body 49 can change the working mode between the first form and the second form. The first form is a form in which the marker body 49 is fixed to the mounting member 65 by pressing the second set screw 71 against the first regulation surface 81a, and is a form in which the tractor 1 is advanced to perform the work. The second form is a form in which the marker body 49 is fixed to the mounting member 65 by pressing the second set screw 71 against the second regulation surface 81b, and is a form in which the tractor 1 is moved backward to perform the work.

As shown in FIGS. 9 and 10, the support bracket 77 is formed of a plate material. The support bracket 77 is fixed to the rear part of the lower part of the mounting rod 76 and protrudes rearward. A support boss 82 is fixed to the support bracket 77. The support boss 82 is formed of a tubular member having a horizontal axis, penetrates the support bracket 77, and projects from the support bracket 77 on both sides of the vehicle width direction B3.

The stopper member 78 is formed of a plate material and is fixed to the rear portion of the support bracket 77. The stopper member 78 is located behind and above the support boss 82. Further, the stopper member 78 projects from the support bracket 77 on both sides of the vehicle width direction B3. Further, the stopper member 78 has a first contact portion 78a whose plate surface faces the front-rear direction A3, and a second contact portion 78b extending rearward from the lower end of the first contact portion 78a.

The marker arm 79 has a strip-shaped first arm 79A and a second arm 79B that are long in the vertical direction. The first arm 79A and the second arm 79B are arranged so as to face each other at intervals in the vehicle width direction B3. The upper portion of the marker arm 79 is pivotally supported by the support bracket 77 around the center of the horizontal axis and can swing back and forth. Specifically, the upper part of the first arm 79A is located on the outer side B1 side of the support boss 82 in the vehicle width direction, and the upper part of the second arm 79B is located on the inner side B2 side of the support boss 82 in the vehicle width direction. .. A pivot 83 is rotatably inserted around the axis of the first arm 79A, the second arm 79B, and the support boss 82. As a result, the marker arm 79 is supported by the support bracket 77 so as to be swingable back and forth around the axis of the pivot 83 (support boss 82).

A marker member 72 is attached to the lower portion of the marker arm 79. Specifically, the marker member 72 has a central portion arranged between the lower portions of the first arm 79A and the second arm 79B, and is rotatably supported by the marker arm 79 around the horizontal axis center via the rotation support shaft 74. There is.
The upper part of the marker arm 79 can come into contact with the stopper member 78. Specifically, the marker arm 79 abuts on the first contact portion 78a in a vertical posture extending downward from the pivot 83 as shown by a solid line in FIG. 10, and as shown by a two-dot chain line in FIG. It abuts on the second contact portion 78b in a backward posture extending rearward from the pivot 83. The marker arm 79 is restricted from swinging forward by abutting on the first contact portion 78a, and can swing backward (backward and upward) from the vertical posture. Further, when the marker arm 79 is oriented vertically, the marker member 72 is located at the action position X1 (see the solid line in FIG. 2) where the marker member 72 touches the field. In other words, the stopper member 78 regulates the forward swing around the horizontal axis center of the marker arm 79 when the marker member 72 is in the action position, but allows the backward swing around the horizontal axis center of the marker arm 79.

Further, the marker arm 79 is restricted from swinging backward and upward by abutting on the second contact portion 78b. Therefore, the marker arm 79 can swing within a range between the position where it abuts on the first contact portion 78a and the position where it abuts on the second contact portion 78b.
In the present embodiment, the marker arm 79 is slightly forward tilted in a vertical posture (inclined shape that shifts backward as it goes downward).

The return spring 80 is formed by a tension coil spring. One end side (upper end side) of the return spring 80 is hooked on the first spring hooking portion 84 provided at the lower part of the mounting rod 76, and the other end side is the second spring hooking portion 85 provided in the middle part of the marker arm 79. Is hooked on. The first spring hooking portion 84 is formed of a pin and is fixed to a fixing piece 42 fixed to the lower portion of the mounting rod 76. The first spring hooking portion 84 is arranged in front of and below the pivot 83. Second
The spring hooking portion 85 is formed of a pin and is fixed to an intermediate portion in the longitudinal direction of the marker arm 79. The return spring 80 urges the marker arm 79 so that the lower portion of the marker arm 79 swings forward around the axis 83. A plate member 86 located behind the return spring 80 and connecting the first arm 79A and the second arm 79B is provided in the middle of the marker arm 79.

Next, the lifting mechanism 50 will be described.
As shown in FIG. 2, the lifting mechanism 50 is a mechanism for lifting the marker member 72 (marker body 49) from the action position X1 to the lifting position X2. As shown in FIG. 3, the plurality of lifting mechanisms 50 include a left lifting mechanism (first lifting mechanism) 50L for lifting the first marker body 49L and a right lifting mechanism (second lifting mechanism) for lifting the second marker body 49R. ) 50R and included.

As shown in FIG. 11, the lifting mechanism 50 includes a mounting tool 87, an operating lever (operating member) 88, a lift arm 89, and an interlocking member 90.
As shown in FIG. 12, the fixture 87 has a first plate 91, a second plate 92, and a plurality of fasteners 93. The first plate 91 and the second plate 92 are attached to the support column 13A by sandwiching and connecting the support column 13A. Specifically, the first plate 91 is arranged so as to abut on the side surface of the support column 13A on the outer side B1 side in the vehicle width direction. The second plate 92 is arranged in contact with the side surface of the support column 13A on the inner side B2 side in the vehicle width direction. The first plate 91 and the second plate 92 project back and forth from the support column 13A. The attachment 87 is attached to the upper part of the support 13A by connecting the front and rear portions of the first plate 91 and the second plate 92 protruding from the support with the fastener 93. The fastener 93 is configured in substantially the same manner as the fastener 58. A lever support shaft (support shaft) 94 is fixed to the first plate 91 so as to project outward B1 in the vehicle width direction.

As shown in FIG. 12, the operating lever 88 is arranged on the upper part of the support column 13A. The operating lever 88 has a lever body 96 formed by bending a bar, and a boss portion 97 fixed to the lever body 96. The boss portion 97 is formed of a tubular member having a horizontal axis, and is rotatably fitted around a lever support shaft 94 around the axis. Therefore, the operating lever 88 can be swung around the lever support shaft 94.

The lever body 96 has a base portion 96a, a grip portion 96b, and a connecting portion 96c. The base portion 96a is arranged on the outer side B1 side of the support column 13A in the vehicle width direction, and is fixed to the boss portion 97. Further, the base portion 96a projects radially outward from the boss portion 97. The grip portion 96b is arranged on the inner side B2 side of the support column 13A in the vehicle width direction. Further, the grip portion 96b is located radially outward of the boss portion 97 from the base portion 96a and extends in parallel with the extension line of the base portion 96a. The connecting portion 96c connects the upper end of the base portion 96a and the lower end of the grip portion 96b. Further, the connecting portion 96c extends in the vehicle width direction B3 across the front of the support column 13A.

As shown in FIG. 13, the operating lever 88 can be displaced to the first position W1 shown by the solid line and the second position W2 shown by the two-dot chain line. The first position W1 is a position where the marker member 72 is operated to the action position X1. The second position W2 is a position where the marker member 72 is lifted and operated to the lifting position X2.
In the first position W1, the operating lever 88 is located above the lever support shaft 94, and in the side view of FIG. 13, the operating lever 88 shifts forward from the boss portion 97 diagonally upward (as it moves upward). It is protruding (in the direction of inclination) and abuts on the front side of the support column 13A. Further, in the first position W1, as shown in FIG. 13, the operating lever 88 is in a direction of pulling up the operating lever 88, which is the direction indicated by the arrow F1, when the connecting portion 96c abuts on the support column 13A (first position W1). The rotation of the operation lever 88 in the direction in which the operation lever 88 is brought into contact with the support column 13A) is restricted.

On the other hand, in the second position W2, the operating lever 88 is located below the lever support shaft 94, and in the side view of FIG. 13, the boss portion 97 is directed diagonally forward and downward (forward as it goes downward). It is protruding (toward the direction of the transition) and abuts on the front side of the column 13A. Further, in the second position W2, the operation lever 88 is in the direction indicated by the arrow F2 in the direction in which the connecting portion 96c abuts on the support column 13A to pull down the operation lever 88 (the operation lever 88 in the second position W2 is used as the support column). The rotation in the direction of contact with 13A) is restricted.

The grip portion 96b can be gripped by an operator seated on the driver's seat 10 side. The operator can operate the operation lever 88 to the first position W1 and the second position W2.
As shown in FIGS. 12 and 13, the lift arm 89 has a base portion 89a fixed to the boss portion 97 and is rotatably supported by the rops 12 around the center of the horizontal axis. Therefore, the lift arm 89 swings integrally with the operating lever 88. That is, the lift arm 89 can be swung by the operating lever 88.

As shown by the solid line in FIG. 13, the lift arm 89 projects rearward from the boss portion 97 when the operating lever 88 is in the first position W1. Further, as shown by the two-dot chain line in FIG. 13, the lift arm 89 protrudes diagonally upward from the boss portion 97 when the operating lever 88 is in the second position W2. The lift arm 89 has a connecting portion 98 on the distal end side.
The interlocking member 90 is a member that interlocks and connects the tip end side of the lift arm 89 and the support arm 48 (main arm 64). The interlocking member 90 is formed by a cord. Specifically, the interlocking member 90 is formed of a cable, a wire, or the like. As shown in FIG. 11, a connecting member 90a is provided on one end side of the interlocking member 90, and the connecting member 90a is connected to the connecting portion 98 of the lift arm 89. A connecting member 90b is also provided on the other end side of the interlocking member 90, and the connecting member 90b is connected to a locking portion 67 provided on the main arm 64.

When the lift arm 89 is swung up and down by the operating lever 88, the support arm 48 swings up and down in conjunction with the up and down swing of the lift arm 89, and the marker member 72 is displaced to the action position X1 and the lifting position X2. ..
Specifically, when the marker member 72 is at the action position X1, the operation lever 88 is located at the first position W1 and the main arm 64 is the vehicle width of the support arm 48, as shown by the solid line in FIGS. 11 and 13. It is in a downward swing position extending in the direction B3. When the marker member 72 is in the action position X1 and the operating lever 88 is swung downward from the first position W1 and operated to the second position W2 as shown by the two-dot chain line in FIGS. 11 and 13. The support arm 48 (main arm 64) is pulled by the interlocking member 90 and swings upward from the downward swing position around the arm support shaft 59. As a result, as shown by the two-dot chain line in FIG. 2, the marker member 72 is lifted from the action position X1 to the lifting position X2 and separates from the field.

Further, when the marker member 72 is at the action position X1, as shown by the solid line in FIG. 13, the interlocking member 90 is located behind the lever support shaft 94, and the weights of the support arm 48 and the marker body 49 are reduced. It acts in the direction of rotating the operating lever 88 in the F1 direction. That is, the weights of the support arm 48 and the marker body 49 act in the direction of bringing the operating lever 88 into contact with the rops 12. As a result, the operating lever 88 is held at the first position W1. Further, by holding the operation lever 88 at the first position W1, the marker member 72 is restricted from being lowered from the action position X1.

Further, when the marker member 72 is at the lifting position X2, the interlocking member 90 is located on the front side of the lever support shaft 94, as shown by the two-dot chain line in FIG. 13, and the support arm 48 and the marker body 49 The weight acts in the direction of rotating the operating lever 88 in the F2 direction. That is, the weights of the support arm 48 and the marker body 49 act in the direction of bringing the operating lever 88 into contact with the rops 12. As a result, the operating lever 88 is held at the second position W2. By holding the operating lever 88 at the second position W2, the marker member 72 is held at the lifting position X2.

As described above, the operating lever 88 abuts on the lops 12 at the first position W1 and the second position W2, and the weights of the support arm 48 and the marker member 72 act in the direction of abutting the operating lever 88 on the lops 12. By doing so, it can be held at the first position W1 and the second position W2.
Next, the lock mechanism 51 will be described.
The lock mechanism 51 is a mechanism that regulates the upward swing of the support arm 48 (main arm 64) when the marker member 72 is at the action position X1.

As shown in FIG. 3, the plurality of lock mechanisms 51 regulate the upward swing of the left lock mechanism (first lock mechanism) 51L that regulates the upward swing of the first support arm 48L and the upward swing of the second support arm 48R. Includes the right locking mechanism (second locking mechanism) 51R.
As shown in FIGS. 14 and 15, the lock mechanism 51 includes a lock support shaft 101, a lock member 102, an operation handle 103, a contact member (first regulating portion) 104, and a return spring (first urging member). ) 105.

The lock support shaft 101 is provided near the rear of the lower part of the first plate 54. One end side of the lock support shaft 101 is fixed to the outer surface of the first plate 54 (the side surface on the outer side B1 side in the vehicle width direction), and the lock support shaft 101 projects from the first plate 54 toward the outer side B1 in the vehicle width direction. The lock support shaft 101 is located in front of and above the main arm 64.
The upper part (front upper part) of the lock member 102 is rotatably supported by the lock support shaft 101 around the center of the horizontal axis and can swing up and down. That is, the lock support shaft 101 pivotally supports the lock member 102 so as to be able to swing up and down. The operation handle 103 is fixed to the upper part (front upper part) of the lock member 102. The operation handle 103 can be operated by an operator seated in the driver's seat 10.

As shown in FIG. 14, the lock member 102 is held by the contact member 104 and the return spring 105 in the locked state Y3 that regulates the upward swing of the support arm 48 (main arm 64).
Specifically, the contact member 104 is located above the lock member 102 and is fixed to the lower outer surface of the first plate 54. Further, the hit member 104 abuts on the lock member 102 in the locked state Y3, and restricts the upward swing of the lock member 102. Further, the hit member 104 allows the lock member 102 to swing downward (swing in a direction away from the hit member 104) from the locked state Y3. The return spring 105 urges the lock member 102 in a direction of swinging upward. The locking member 102 is held in the locked state Y3 by the urging force of the return spring 105.

As shown in FIG. 15, the return spring 105 is formed by a torsion coil spring, and the coil portion 105a is fitted to a tubular member 106 fitted to the outside of the lock support shaft 101. One end 105b of the return spring 105 is hooked on the operation handle 103, and the other end 105c is hooked on the hook hole 107 formed in the first plate 54.
As shown in FIG. 14, in the locked state Y3, the lock member 102 has an inclined shape that shifts downward as it goes backward. In other words, it has an inclined shape extending from the arm support shaft 59 toward the main arm 64 in a state of extending in the vehicle width direction B3. Further, in the locked state Y3, the lock member 102 is located above the support arm 48 (main arm 64) in the downward swing position. Therefore, when the support arm 48 comes into contact with the lock member 102, the upward swing of the support arm 48 is restricted. Specifically, when the lock member 102 is in the locked state Y3, the rear portion on the lower end side of the lock member 102 is located close to the upper portion of the front portion of the main arm 64, and the main arm 64 swings upward. By abutting on the lower part of the lock member 102, the upward swing of the main arm 64 is restricted.

Further, the lock member 102 can be displaced to the unlocked state (see the two-dot chain line in FIG. 16) Y4 retracted from above the main arm 64 (support arm 48) by swinging downward from the locked state Y3. .. By displacing the lock member 102 to the unlocked state Y4, the support arm 48 is allowed to swing upward, and the marker member 72 can be lifted to the lifting position X2.

To bring the lock member 102 into the unlocked state Y4, as shown by the arrow G1 in FIG. 14, by lifting the operation handle 103, the lock member 102 swings downward and the unlocked state Y4 (two-dot chain line in FIG. 16). See). Further, when the marker member 72 is moved from the lifted position X2 to the action position X1, as shown in FIG. 16, the main arm 64 abuts on the lock member 102 in the locked state Y3 from above, so that the lock member 102 becomes the main. It is pressed by the arm 64 and swings downward to enter the unlocked state Y4. When the support arm 48 is lowered to the downward swing position, the lock member 102 is automatically returned to the locked state Y3 by the urging force of the return spring 105.

In order to mark the field with the marker device 46 having the above configuration, as shown by the solid line in FIG. 1, the marker member 72 is set to the action position X1 and the tractor 1 is advanced. Then, the marker member 72 makes a streak-shaped mark on the field while rolling the field. When the marker member 72 comes into contact with an obstacle such as a stone while rolling in the field, the marker arm 79 swings backward (backward and upward) against the urging force of the return spring 80. As a result, the impact load acting on the marker member 72 is alleviated, and damage to the marker member 72 and the like is prevented.

Further, by adjusting the position of the mounting member 65 with respect to the main arm 64, the position of the marker member 72 in the vehicle width direction B3 can be adjusted. Further, by adjusting the vertical position of the mounting rod 76 with respect to the mounting member 65, the depth of action of the marker member 72 with respect to the field can be adjusted.
Next, the work by the tractor 1 of this embodiment will be described with reference to FIG.

As described above, the tractor 1 is manually driven from the work start position D1 to the work end position D2 in the field, the work is performed by the work machine 38 to set the reference line K1, and then the tractor is set on the headland on the work end side. The vehicle body 3 is driven by auto-steering control based on the planned travel route R1 on the unworked land next to the work site where the work was performed by turning 1.

The work on this unworked area is carried out by driving the vehicle body 3 by auto steering control based on the planned travel route R1. Hereinafter, the work by this auto steering control is repeated, and the tractor 1 is reciprocated to perform the work on the field.
In the following description, going work (work performed from bottom to top in FIG. 17) is referred to as outward work, and return work (work performed from top to bottom in FIG. 17) is referred to as return work.

When performing outbound work, the marker member 72 is an unworked area next to the work area where the work is performed, and the marker member 72 on the unworked area side where the work is performed next (in the figure, the marker member 72 on the left). ) Is set to the action position X1, and the marker member 72 (in the figure, the right marker member 72 in the figure) on the opposite side to the marker member 72 set to the action position X1 is set to the lift position X2. When performing the return route work, the left marker member 72 is lifted to the lifting position X2 and the right marker member 72 is set to the acting position X1.

When the tractor 1 reaches the work end position D2, the marker member 72 set to the action position X1 is lifted to the lift position X2, and the tractor 1 is swiveled to the unworked ground side where the work is to be performed, and the work is started. At this time, the traveling start position of the tractor 1 is determined by aligning a part of the tractor 1, for example, a part of the front wheel 8 with the mark H1 attached by the marker member 72. When the travel start position is determined, the command switch 31 is pressed at the travel start position to set the travel schedule route R1, and the vehicle body 3 is driven by auto steering control based on the travel schedule route R1 to perform the work. Therefore, the marker member 72 in the present embodiment is a member that attaches a mark H1 that serves as a guide for determining the position of the vehicle body 3 when starting traveling along the planned traveling route R1.

In this way, by attaching the mark H1 to the field, which serves as a guide for determining the position of the vehicle body 3 when starting traveling along the planned traveling route R1, the vehicle body 3 when starting traveling along the planned traveling route R1. The positions of the ridges can be easily and accurately determined. For example, when the ridges are erected, the ridges can be accurately formed at predetermined intervals.
In the present embodiment, the marker body 49, the support arm 48, the lifting mechanism 50, and the locking mechanism 51 are provided on both the left side and the right side of the tractor 1, but depending on the work or the operator, the work end side of the field. When the work is done to the end, the tractor 1 may be moved backward and returned to the end on the work start side to work on the unworked area. Therefore, the marker body 49, the support arm 48, the lifting mechanism 50 and the lock mechanism may be used. The 51 may be provided only on the left side of the tractor 1 or only on the right side. In other words, the marker device 46 may have at least one marker body 49, a support arm 48, a lifting mechanism 50, and a locking mechanism 51.

Further, in the present embodiment, the embodiment in which the marker device 46 is attached to the rops 12 is exemplified, but the present invention is not limited to this, and the marker device 46 may be attached to a portion of the tractor 1 other than the rops 12. good. Further, in the present embodiment, an example in which the marker device 46 is attached to the rear of the driver's seat 10 is shown, but the present invention is not limited to this, and the marker device 46 may be attached to the front side of the driver's seat 10.

Next, the effect of the tractor 1 of the present embodiment will be described.
The tractor 1 has a travelable vehicle body 3, an arm support shaft 59 supported on the vehicle body 3 side, a protrusion from the vehicle body 3 side toward the outer B1 in the vehicle width direction, and an arm on the inner side portion 64a in the vehicle width direction. A support arm 48 that is pivotally supported by a support shaft 59 and has an outer side portion in the vehicle width direction (second member 70) that can swing up and down around the arm support shaft 59, and an outer side portion in the vehicle width direction of the support arm 48. A marker member that is supported by the support arm 48 and swings upward around the arm support shaft 59 so that the marker member can be displaced from the action position X1 that touches the field to mark H1 to the lifting position X2 that is separated from the field. 72 is provided with a lock member 102 that is located above the support arm 48 when the marker member 72 is at the action position X1 and regulates the upward swing of the support arm 48.

According to this configuration, the lock member 102 can prevent the marker member 72 from being accidentally lifted from the action position X1 to the lifting position X2.
Further, the lock member 102 can be displaced from the locked state Y3 that restricts the upward swing of the support arm 48 to the unlocked state Y4 retracted from the upper position of the support arm 48 by swinging downward.

According to this configuration, the restriction on the upward swing of the support arm 48 by the lock member 102 can be released by a simple operation.
Further, the lock support shaft 101 that pivotally supports the lock member 102 so as to be able to swing up and down, and the first regulating portion (hit member 104) that regulates the upward swing of the lock member 102 in the locked state Y3 but allows the downward swing. And a first urging member (return spring 105) that urges the lock member 102 in a direction of swinging upward.

According to this configuration, when the support arm 48 is swung downward from the position where it is swung upward, the lock member 102 is swung downward from the locked state Y3 and displaced to the unlocked state Y4 by being pressed by the support arm 48. Then, when the support arm 48 passes through the lock member 102, the lock member 102 returns to the locked state Y3 by the urging force of the first urging member. As a result, the marker member 72 can be easily displaced from the lifted position X2 to the action position X1.

Further, the support 73 is provided with a support 73 attached to a portion of the support arm 48 on the outer side in the vehicle width direction. The marker arm 79, the second restricting portion (stopper member 78) that regulates the forward swing of the marker arm 79 when the marker member 72 is at the action position X1, but allows the rear swing, and the marker arm 79 forward. It has a second urging member (return spring 80) that urges the vehicle in a swinging direction.

According to this configuration, when the marker member 72 comes into contact with an obstacle such as a stone, the marker member 72 can be released backward, and damage to the marker member 72 can be prevented.
Further, a mounting body (rops 12) mounted on the vehicle body 3 and a lifting mechanism 50 mounted on the mounting body and lifting the marker member 72 from the action position X1 to the lifting position X2 are provided, and the lifting mechanism 50 is a horizontal axis. A lift arm 89 that is supported so as to be swingable around, an interlocking member 90 that interlocks and connects the lift arm 89 and the support arm 48, and an operation member that swings the lift arm 89 to swing the support arm 48 up and down. (Operating lever 88) having an operating member that can be displaced to a first position W1 that positions the marker member 72 at the action position X1 and a second position W2 that positions the marker member 72 at the lifting position X2. The operating member abuts on the mounting body at the first position W1 and the second position W2, and the weights of the support arm 48 and the marker member 72 act in a direction in which the operating member abuts on the mounting body. It can be held at the 1st position W1 and the 2nd position W2.

According to this configuration, the marker member 72 can be held at the action position X1 and the lifting position X2 with a simple configuration.
Further, the support arm 48 includes a main arm 64 pivotally supported on the arm support shaft 59 so as to be vertically swingable, a first member 69 attached to the main arm 64 so as to be adjustable in position in the vehicle width direction B3, and a first member. A second unit that is fixed to 69 and the marker member 72 is supported so that the vertical position can be adjusted.
It has a mounting member 65 including the member 70.

According to this configuration, the position of the marker member 72 can be adjusted in the vehicle width direction B3, and the depth can be adjusted with respect to the field.
Further, the lops 12 attached to the vehicle body 3 and a marker device 46 attached to the lops 12 including at least one marker member 72, a support arm 48, and a lock member 102 are provided. ..

According to this configuration, by attaching the marker device 46 to the rops 12, the marker device 46 can be easily attached to the vehicle body 3.
Further, the marker device 46 is provided from the left marker member 72, the left support arm 48 and the left lock member 102 provided on the left side of the center of the vehicle body 3 in the vehicle width direction B3, and the center of the vehicle body 3 in the vehicle width direction B3. It includes a right marker member 72 provided on the right side, a right support arm 48, and a right lock member 102.

According to this configuration, it is possible to correspond to the case where only the left marker member 72 is used, the case where only the right marker member 72 is used, and the case where both the left and right marker members 72 are used.
Further, the position detection device 23 that detects the position of the vehicle body 3, the steering device 17 that steers the vehicle body 3, and the steering of the steering device 17 are automatically controlled and set based on the detection value acquired by the position detection device 23. A control device 25 for traveling the vehicle body 3 along the planned travel route R1 is provided, and the marker member 72 serves as a guide for determining the position of the vehicle body 3 when starting travel along the planned travel route R1. Turn on H1.

According to this configuration, the position of the vehicle body 3 when starting traveling along the planned traveling route R1 can be easily determined.
Although one embodiment of the present invention has been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

3 Body 12 Mounting body (Lops)
17 Steering device 23 Position detection device 25 Control device 46 Marker device 48 Support arm 50 Lifting mechanism 59 Arm support shaft 64 Main arm 64a Inward side part in vehicle width direction 65 Mounting member 69 First member 70 Outer side part in vehicle width direction ( 2nd member)
72 Marker member 73 Support 78 Second regulation part (stopper member)
79 Marker arm 80 Second urging member (return spring)
88 Operation member (operation lever)
89 Lift arm 90 Interlocking member 102 Lock member 101 Lock support shaft 104 First regulation part (hit member)
105 First urging member (return spring)
B1 Outside in the vehicle width direction H1 Mark R1 Scheduled travel route W1 1st position W2 2nd position X1 Action position X2 Lifting position Y3 Locked state Y4 Unlocked state

Claims (9)

With a car body that can run
The arm support shaft supported on the vehicle body side and
It protrudes outward in the vehicle width direction from the vehicle body side, and the inner side portion in the vehicle width direction is pivotally supported by the arm support shaft, and the outer side portion in the vehicle width direction swings up and down around the arm support shaft. With possible support arms,
The support arm is supported by a portion on the outer side in the vehicle width direction, and the support arm swings upward around the arm support axis, so that the support arm is displaced from the action position where it touches the field and marks the field. A marker member that can be displaced to the lifting position and
A lock member located above the support arm when the marker member is in the action position and restricting the upward swing of the support arm.
Equipped with
The lock member is a tractor that can be displaced from the locked state that restricts the upward swing of the support arm to the unlocked state retracted from the upper position of the support arm by swinging downward . A first urging member that automatically returns the lock member from the unlocked state to the locked state is provided.
By swinging the support arm downward from the state where the marker member is in the lifting position, the support arm presses the lock member in the locked state to resist the urging force of the first urging member. The tractor according to claim 1, wherein the lock member swings downward and the marker member is displaced to the action position . A lock support shaft that pivotally supports the lock member so that it can swing up and down,
The first regulating unit that regulates the upward swing of the lock member in the locked state but allows the downward swing,
A first urging member that urges the lock member in a direction of swinging upward,
The tractor according to claim 1 or 2. A support attached to a portion of the support arm on the outer side in the vehicle width direction is provided.
The support is
A marker arm that is ANDed at the upper part and can swing back and forth, and the marker member is attached to the lower part.
A second regulating unit that regulates forward swing of the marker arm but allows backward swing when the marker member is in the action position.
The tractor according to any one of claims 1 to 3, further comprising a second urging member for urging the marker arm in a direction of swinging forward. With a car body that can run
The arm support shaft supported on the vehicle body side and
It protrudes outward in the vehicle width direction from the vehicle body side, and the inner side portion in the vehicle width direction is pivotally supported by the arm support shaft, and the outer side portion in the vehicle width direction swings up and down around the arm support shaft. With possible support arms,
The support arm is supported by a portion on the outer side in the vehicle width direction, and the support arm swings upward around the arm support axis, so that the support arm is displaced from the action position where it touches the field and marks the field. A marker member that can be displaced to the lifting position and
A lock member located above the support arm when the marker member is in the action position and restricting the upward swing of the support arm.
The mounting body attached to the vehicle body and
It is equipped with a lifting mechanism that is attached to the mounting body and lifts the marker member from the action position to the lifting position.
The lifting mechanism is
A lift arm that is swingably supported around the center of the horizontal axis,
An interlocking member that interlocks and connects the lift arm and the support arm,
An operation member for swinging the lift arm to swing the support arm up and down, the first position for positioning the marker member at the action position and the second position for positioning the marker member at the lift position. It has a position and an operating member that can be displaced.
The operating member abuts on the mounting body at the first position and the second position, and the weights of the support arm and the marker member act in a direction in which the operating member abuts on the mounting body. , A tractor that can be held in the first position and the second position. The support arm
A main arm that is pivotally supported on the arm support shaft so that it can swing up and down,
An attachment member including a first member attached to the main arm so as to be adjustable in position in the vehicle width direction, and a second member fixed to the first member and supported by the marker member so as to be vertically adjustable.
The tractor according to any one of claims 1 to 5. The rops attached to the car body and
A marker device attached to the rops, the marker device including at least one marker member, the support arm, and the lock member.
The tractor according to any one of claims 1 to 6, comprising the tractor. The marker device is
The left marker member, the left support arm, and the left lock member provided on the left side of the center of the vehicle body in the vehicle width direction.
The tractor according to claim 7, further comprising the right marker member, the right support arm, and the right lock member provided on the right side of the center in the vehicle width direction of the vehicle body. A position detection device that detects the position of the vehicle body and
The steering device that steers the vehicle body and
A control device that automatically controls the steering of the steering device to drive the vehicle body along a planned travel route set based on a detection value acquired by the position detection device.
Equipped with
The tractor according to any one of claims 1 to 8, wherein the marker member is a mark that serves as a guide for determining a position of a vehicle body when starting traveling along the planned traveling route.

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