JP2003180116A - Mobile farm machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn mower provided with a suspension height adjusting means for the mower to enable easy adjustment of the height of mowed lawn and the confirmation work of the mowing height after the adjustment work. <P>SOLUTION: The suspension height of a mower 15 is adjusted by the mower suspended in front of front wheels and under a vehicle body 2 supporting front wheels 1 and rear wheels 7 and a link mechanism 16 to suspend the mower 13 under the vehicle body 2. The suspension height of the mower 15 can be changed by changing the stacking number of multiple collars 44 put on a suspension height adjusting shaft 31. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile agricultural machine relating to a tractor equipped with a mid-mower or a front mower for lawn mowing, and more particularly to a mower suspension height adjusting structure.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 11, a front wheel 1 and a rear wheel 7 of a tractor are supported by a vehicle body 2 which is a main frame, and an engine 3 and a mission case 6 are mounted on the vehicle body 2. .

Rotational power of the engine 3 is transmitted to a transmission, a front / rear switching device and the like in the transmission case 6 to drive the front wheels 1 and the rear wheels 7. The tractor shown in FIG. 11 has a front door 15 for lawn mowing arranged at the lower front of the machine body.

[0004]

The height of the lawn mowing is adjusted by the lawn mowing front door 15 provided on the lower front side of the body of the tractor. The left and right arms 17 suspending the lawn mower body and the tip end cylindrical portion 17a. Attached to the shaft 101
Lateral pins 101 to be inserted into the plurality of pin holes 101a
The cutting height of turf was adjusted by replacing the b position. For this reason, the difference between the left and right protruding heights of the shaft 101 protruding upward from the distal end cylinder portion 17a is difficult to understand in terms of the amount of division and the workability is poor.

There is also a method of adjusting the lawn mowing height by inserting and removing a plurality of collars into and from the hanging arm of the lawn mower body, but in this method, the gauge wheel of the caster portion is not completely removed from the hub. And the cutting height could not be changed.

Therefore, the present invention provides a mower for mower provided with a mower suspension height adjusting means for easily adjusting the lawn mowing height and for easily confirming the adjusted lawn mowing height. It is to be.

[0007]

The above-mentioned problems of the present invention can be solved by the following constitutions. According to the first aspect of the present invention, the vehicle body 2 supporting the front wheels 1 and the rear wheels 7, the mower 15 hung below the vehicle body 2 and forward of the front wheel 1, and the mower 15 hung on the vehicle body 2. The link mechanism 16, the link mechanism 16, the gauge wheel 18, and the gauge wheel 1
8 for supporting the arm 8, a boss 45 provided at the tip of the arm 17, a suspension height adjusting shaft 31 of the mower 15 attached to the boss 45, and a top and bottom of the shaft 31 with the boss 45 interposed therebetween. It is a mobile agricultural machine provided with a plurality of stackable collars 44 for adjusting the suspension height position of the mower 15.

According to the first aspect of the present invention, the mower unit 15 is provided.
In order to increase the hanging height of, one or more collars 44 are removed from the shaft 31 (FIG. 4 (b)). Then color 4
By lowering the suspension height of the shaft 31 and lowering the gauge wheel 18 by an amount corresponding to the removal of 4, the ground height of the deck 20 having a cutting blade (not shown) relatively increased, and the grass grass vegetated on the ground is increased. Cut high. At this time, the collar 44 is attached to the shaft portion between the two bosses 42 and 45 provided on the lower shaft 31 (FIG. 4C, FIG.
(D)).

According to the second aspect of the present invention, the vehicle body 2 supporting the front wheels 1 and the rear wheels 7, the mower 47 provided below the vehicle body 2, the link mechanism 48 for suspending the mower 47 on the vehicle body 2, and the link mechanism. A mobile agricultural machine provided with a cylinder 71 for adjusting the suspension height position of the mower 47 by 48 and a suspension height lower limit position restricting member 74 for preventing the suspension height position of the mower 47 by the cylinder 71 from falling below the lower limit value. is there.

According to the second aspect of the invention, the maximum contraction of the piston rod 72 of the cylinder 71 is achieved by the suspension height lower limit position restricting member 74 (the L-shaped arm 76 having an elongated hole is moved by the rotation of the knob 79). The position is restricted so that the mower 47 does not fall too much.

According to a third aspect of the present invention, the vehicle body 2 supporting the front wheels 1 and the rear wheels 7 and the mower 15 provided below the vehicle body 2,
47 and link mechanisms 16 and 48 that suspend the mowers 15 and 47 on the vehicle body 2, and actuators (cylinders 29 and 71) that drive the link mechanisms 16 and 48 to adjust the suspension height position of the mowers 15 and 47. Electric device to control 8
In a moving vehicle equipped with 2, 84, a mower cutting blade drive detection sensor 80 and a predetermined elevated position detection sensor 81 for the mowers 15, 47 are provided, and when both the sensors 80, 81 operate, an actuator (cylinder 29, 71) is a mobile agricultural machine provided with a control means for stopping the ascending operation of 71) via the electric devices 82, 84.

According to the invention of claim 3, the mower 1
When the drive detection sensor 80 for the cutting blades 5 and 47 detects the drive rotation and the predetermined rising position detection sensor 81 detects the predetermined position, the rising of the mowers 15 and 47 is stopped. As a result, when the cutting blade is in the driven state, the mower 15 is moved beyond a predetermined position.
Do not raise 47.

When the drive detection sensor 80 for the cutting blades of the mowers 15 and 47 does not detect the drive rotation (when not working)
Therefore, the rise of the mowers 15 and 47 is not regulated, and the mowers 15 and 47 can be raised to the upper limit position beyond the predetermined rise position.

The invention according to claim 4 is characterized in that the vehicle body 2 supporting the front wheels 1 and the rear wheels 7, the mowers 15 and 47 provided below the vehicle body 2, and the links for suspending the mowers 15 and 47 on the vehicle body 2. In a moving vehicle provided with the mechanisms 16 and 48 and the electric devices 82 and 84 that control the actuators (cylinders 29 and 71) that drive the link mechanisms 16 and 48 to adjust the suspension height position of the mowers 15 and 47, Link mechanism 1
An inclination angle detection sensor 85 for a lift link, which is one of the components 6, 48, is provided. The inclination angle detection sensor 85 causes the mowers 15, 47 to be located at the suspension height position between the upper limit position and the lower limit position. As described above, the mobile agricultural machine is provided with the control device 93 for controlling the up and down operation of the actuator (cylinders 29, 71) via the electric devices 82, 84.

According to the invention of claim 4, the mower 1
The link mechanisms 16 and 48, which are proportionally moved up and down via actuators (cylinders 29 and 71) according to the value of the tilt angle detection sensor 85 that detects the tilt angles of the lift links 5 and 47, have different power transmissions. Whether or not the joint is driven, the value of the tilt angle detection sensor 85, and the like are transmitted to the control device 93, so that the rising positions of the mowers 15 and 47 can be managed according to the tilt angle of the lift link during work or non-work.

[0016]

According to the first aspect of the present invention, the suspension height of the front mower 15 can be easily adjusted by using the plurality of collars 44, and the adjustment collars 44 can be held on the same shaft 31. , It is not necessary to store the unused color 44 of the plurality of colors 44 in another place,
In addition, there is no risk of the collar 44 being lost in such a case. In addition, the set hanging height of the gauge wheels 18 on the left and right of the mower can be known at a glance simply by looking at the number of the collars 44 provided on the upper or lower portion of the boss 45.
It becomes easy to adjust the suspension height of the mower 15.

According to the second aspect of the present invention, the contraction restricting member 74 can restrict the lowering position of the lawn mowing height, and the work vehicle vibrates while moving or oil for the hydraulic circuit leaks to the outside. However, there is no risk that the mower 47 will hit the ground, and the shrinkage restriction member 74 can be retrofitted to an existing tractor, so that there is an advantage that additional installation can be performed as necessary.

According to the inventions of claims 3 and 4,
When the cutting blade drive detection sensor 80 of the mowers 15 and 47 detects the drive rotation and the predetermined rising position detection sensor 81 detects the predetermined position, the rising of the mowers 15 and 47 is stopped. As a result, the mowers 15, 47 are not raised above the predetermined position when the cutting blade is in the driven state.

Further, when the drive detection sensor 80 for the cutting blades of the mowers 15 and 47 does not detect the drive rotation (when not working)
Therefore, the rise of the mowers 15 and 47 is not regulated, and the mowers 15 and 47 can be raised to the upper limit position beyond the predetermined rise position.

Furthermore, the link mechanisms 16 and 48, which are proportionally moved up and down via actuators in accordance with the value of the tilt angle detection sensor 85 for detecting the tilt angle of the lift links of the mowers 15 and 47, are used for different power transmission. Whether or not the joint is driven, the value of the inclination angle detection sensor 85, and the like are transmitted to the control device 93, so that the height of the rising position of the mowers 15 and 47 can be managed according to the inclination angle of the lift link during work or non-work. .

[0021]

1 is a schematic side view of a tractor according to an embodiment of the present invention. The front wheels 1 and the rear wheels 7 of the tractor are supported by a vehicle body 2 which is a main frame, and a cockpit 10, a steering wheel 11, an engine 3, a mission case 6 and the like are mounted on the vehicle body 2. The rotational power of the engine 3 is transmitted to a transmission, a front-rear switching device, and the like (not shown) housed in the transmission case 6 to form a traveling drive system that drives the front and rear wheels.

FIG. 1 is a side view of the tractor in which the front mower 15 is suspended in front of the front wheels 1 via the link mechanism 16 on the vehicle body 2, and FIG. 2 is a front view thereof. Link mechanism 16
Is a pair of left and right suspension links 1 projecting forward from the vehicle body 2.
6a, 16a and a lower link 16 mounted between the rear part of the deck 20 which is a cover body of the front mower 15 and the vehicle body 2.
b and 16b (Fig. 3) as main links, and the suspension link 1
The tip end of 6a is swingably attached to a shaft 20a at the center of the deck 20 in the front-rear direction. The rear portion of the deck 20 and the intermediate portion of the suspension link 16a are connected by a vertical rod 19 so that the length thereof can be adjusted. The rod 19 is provided with a large number of holes 19a, and the horizontal posture of the deck 20 can be changed through the specific holes 19a.

A main arm 17 is projecting from the shaft 20a on the deck 20 to the left and right, and the main arm 17 is fixed to the front portion of the deck 20. A cylindrical boss 45 is integrally provided at the tip of the main arm 17, and the boss 45
A gauge wheel 18 is supported on the. The front mower 15 is provided with a deck 20 which is a cover body having an opening at the lower side, and a rotary blade 23 for lawn mowing in the cover body.
Rollers 21 are installed at the rear of the deck 20,
The roller 21 is supported back and forth together with the gauge wheel 18 attached to the main arm 17, and can run along the unevenness of the ground as shown in FIG.

As shown in the side view of the front mower 15 in FIG. 3, the driving force of the engine 3 is transmitted to the rotary shaft 24 of the propeller-shaped rotary blade 23 through the universal joints 25 and 26 and the power transmission joint 28. . Again deck 20
The main arm 17, which is projected and fixed to the front part of, moves in the same posture as the deck 20 as the link mechanism 16 moves up and down by the hydraulic cylinder 29 that is an actuator.
The cylinder 29 is controlled by oil supply from a hydraulic circuit (not shown) in the transmission. FIG. 3 shows a state in which the front mower 15 is lifted from the ground by the cylinder 29.

The height of the lawn mowing of the front mower 15 is adjusted by the cylinder 29 shown in FIG. 3 in a state of being suspended from the ground. The lawn mowing height of the front mower 15 is a gauge suspended from the tip of the main arm 17. It is determined by the ground contact height of the foil 18.

FIG. 4 is an explanatory view of a structure for adjusting the lifting height of the gauge wheel 18 of the front mower 15 from the ground contact surface. Main arm 1 for supporting the gauge wheel 18
The shaft 31 for adjusting the lifting height is attached to the boss 45 at the tip of the No. 7. The shaft 31 is shown in FIG. 5, and a vertical groove 31c is provided in the vertical direction on the outer periphery of the intermediate portion in the vertical direction of the shaft 31, and the shaft 31 is provided by the tip of the lock bolt 47 with respect to the boss 45.
It can be moved up and down within the range of, and it is attached while being restricted in the direction of rotation. Further, small diameter portions 31e are provided above and below the vertical groove 31c, respectively. Furthermore, at the bottom of the shaft 31,
A large-diameter connecting portion 31d and a small groove 31f for attaching a snap ring are provided.

As described above, the boss 42 having the grease inlet 42a is rotatably attached to the shaft 31 which is attached to the boss 45 by a predetermined range so as to be vertically movable and non-rotatable, and is stopped. It is attached so that it does not come off with the wheel 31g. A fork 33 is integrally attached to the boss 42 by welding or the like, and a gauge wheel 18 is attached to the lower end of the fork 33. This constitutes a gauge wheel caster part.

FIG. 5A is a side view and FIG. 5B is a side view.
The cylindrical or substantially cylindrical shaft 31 shown in the side view of the shaft (a) rotated by 90 ° and the horizontal sectional view of FIG. 5 (c) or FIG. 5 (c ') has a small diameter at the top. A hole 31a for inserting the cotter pin 36 is provided in the portion 31e.
A hole 31b into which the spring pin 38 for preventing the cotter pin 36 from coming off can be inserted is provided above a.
Below the two holes 31a and 31b, the above-described rotation restricting vertical groove 31c is provided, and the shaft 31 moves up and down within the range of the vertical groove 31c.

In order to determine the height position of the gauge wheel 18 attached to the lower end of the shaft 31, the vertical movement of the shaft 31 is regulated and fixed to a boss 45 integrated with the tip of the main arm 17, or the gauge wheel relative to the shaft 31 is fixed. It is necessary to regulate the vertical movement of the boss 42 of the caster portion and fix it. Here, the collar 44 that regulates and fixes the upper and lower sides of the shaft 31 will be described.

The collar 44 is C-shaped in plan view, and the opening width of the opening 44a is wider than the narrow diameter portion 31e of the shaft 31 and narrower than the outer diameter of the shaft 31.
The inner diameter 44b of the collar 44 is larger than the outer diameter of the shaft 31.

For this reason, the collar 44 can be inserted from the small diameter portion 31e of the shaft 31 and does not come off when it is vertically slid to the outer diameter portion of the shaft 31 after insertion. In the illustrated example, as shown in FIGS. 5C and 5C, the cross-sectional shape of the small-diameter portion 31e is such that the entire circumference of the shaft 31 is narrowed or cut into parallel widths. Other shapes may be used as long as the opening 44a of 44 can be inserted.

When the shaft 31 is pulled upward without the collar 44 attached, the boss 42 on the gauge wheel caster side is integrally attached to the tip of the main arm 17 by the retaining ring 31g attached to the small groove 31f at the lower end of the shaft 31. It moves up to a position where it contacts the lower surface of the boss 45. As a result, the shaft 31 is provided above the boss 45.
The outer diameter part of the is projected.

Here, the small diameter portion 31e on the upper portion of the shaft 31
When a plurality of collars 44 are sequentially inserted (5 in the example in the figure) and a cotter pin 36 for one-touch attachment / detachment is attached to the hole 31a of the small diameter portion 31e, the collar 44 cannot be removed (state shown in FIG. 4 (a)). ). That is, the main part of this invention is
The small-diameter portions 31e provided above and below the shaft 31 appear when necessary and are covered when unnecessary. Therefore, according to the present invention, by removing the cotter pin 36, one or more gaps of the collar 44 can be formed in this portion. As a result, as shown in FIG. 4B, the small diameter portion 31e of the gap is formed.
The collar 44 can be pulled out from the part. After pulling out the collar 44 and sliding the shaft 31 downward, as shown in FIG.
As shown in (c) and FIG. 4 (d), a small-diameter portion 31e is used in the lower portion of the boss 45, and the collar 44 can be inserted from here in the horizontal direction. In the illustrated example, the lower part of the cotter pin 36 and the boss 45
A washer 46 is attached between the boss 45 and the lower portion of the boss 45 to release the thrust stress due to the rotation with each member.

By the above-mentioned operation, the collar 44 can be freely moved above or below the boss 45 by one-touch operation, and can be operated without touching the grease applied around the shaft 31. When the collar 44 is moved above the boss 45, the shaft 31 moves upward, the gauge wheel caster moves upward, and the deck 20 also moves upward. Therefore, when the gauge wheel 18 is grounded, the rotary blade 23 of the mower 15 is lowered.
The lawn grass can be cut low (short).

On the contrary, when the collar 44 is moved and adjusted below the boss 45, the shaft 31 descends and the gauge wheel moves downward with respect to the deck 20, so that the rotary blade 23 of the mower 15 moves upward to raise the lawn mowing ( Mow for a long time.

If the plurality of collars 44 are made the same color and the washers 46 and the bosses 42, 45 are respectively colored with different colors, it is possible to see at a glance how many collars 44 are installed on the shaft 31 and at a glance. The hanging height of the mower 15 can be predicted,
It becomes easy to adjust the suspension height of the mower 15. As described above, the suspension height of the front mower 15 can be easily adjusted by using the plurality of collars 44, and the collar 44 for adjustment can be held on the same shaft 31. Is not stored elsewhere, and the risk of loss of collar 44, which would often occur then, is eliminated.

At this time, the hanging height of the deck 20 which is the cover body by the rod 19 is simultaneously adjusted so that the rotary blade 23 becomes parallel to the ground.

A side view of the tractor according to another embodiment of the present invention is shown in FIG. FIG. 6 is a side view of an example in which the lawnmower is arranged below the body abdomen between the front wheels 1 and the rear wheels 7, and the mid mower 47 is mounted on the vehicle body 2 through the link mechanism 48. FIG. In FIG. 7, a partially enlarged view of FIG. 7 is shown in FIG.
Are shown respectively.

The front and rear sides of the mid mower 47 are supported by a link mechanism 48 composed of front and rear links 49 and 50 provided substantially parallel to the vehicle body 2. Mid moor 4
Front and rear wheels 52 and 53 are provided in front of and behind a deck 51 which is a cover body of No. 7. The deck 51 is open at the bottom, and a lawn mowing blade (rotary blade) (not shown) is installed in the deck body 51. The driving force of the engine 3 is transmitted to the rotary shaft of the rotary blade.

Pulley 5 provided on the output shaft of engine 3
5 and a lower pulley 56 provided below the vehicle body 2, a V belt 58 stretched between the pulleys 55, 56, a lower pulley 56 provided below the vehicle body 2, and the pulley 56.
A center pivot shaft 60 to which is attached, a universal joint 61 sequentially connected to the center pivot shaft 60,
The rotary blade is driven via the power transmission joint 62, the universal joint 63, and the rotary shaft portion 65.

A link mechanism in which one end of the mid mower 47 is swingably supported by the vehicle body 2 via a link 49, and the other end is supported by a link 50 connected to the deck 51, and the rear side of the mid mower 47 is a link 50. The height of the lawn mowing is adjusted so that it can be lifted substantially parallel by 48.

For the swinging of the link 50, an arm 6 with a long hole is supported at the center of the link 50 so that the end is rotatably supported.
7. An arm 68a whose end engages with an elongated hole 67a of the arm 67, and a lower end of the arm 68a is fixed to a support shaft 66 provided on a support member 69 below the vehicle body 2.
Rotate around.

An arm 68 is attached to the support shaft 66 of the arm 68a.
b is further fixed, and the other end of the arm 68b is rotatably connected to the distal end of a piston rod 72 of a cylinder 71 for raising and lowering the mid arm via a connecting shaft 73.

As shown by the arrow in FIG. 8, by extending the piston rod 72 of the cylinder 71, the link 50 is lifted and the lawn mowing height by the rotary blade is increased, and by contracting the cylinder 71, the lawn mowing height is increased. Get lower.

During lawn mowing work of the tractor having the above-described mid mower 47, the weight of the mid mower 47 is received on the ground surface via the front and rear wheels 52 and 53. The mid mower 47 may fall and damage the grass, or the rotary blade may touch the ground and damage it. Further, the height of the rear wheel 53 can be adjusted stepwise up and down by changing the mounting pin removal / insertion position, but it could not be stepped up and down.

Therefore, in this embodiment, the shrinkage restricting member 74 of the piston rod 72 of the cylinder 71 is provided. The shrinkage restricting member 74 of the piston rod 72 is the cylinder 71.
One end is fixed to the base of the cylinder 71 along the side surface of the cylinder 71, and the other end is a gauged L-shaped arm 75 with a bent portion 75a facing the tip apex of the piston rod 72 of the cylinder 71 and one end. Engages with the tip apex of the piston rod 72 via the connecting shaft 73, and the bent portion 76a faces the position where the other end faces the tip apex of the piston rod 72, similarly to the L-shaped arm 75 with a gauge. The L-shaped arms with long holes 76 are arranged in parallel.

FIG. 8B shows a view of the L-shaped arm 76 with the long hole from the direction of the arrow A. The L-shaped arm 76 with the long hole is shown in FIG.
Through the elongated hole 76b of the cylinder 71 and the L-shaped arm 75 with a gauge is rotatably connected to the tip apex of the piston rod 72 of the cylinder 71 by a connecting shaft 73 (there is an elongated hole (not shown) corresponding to the elongated hole 76b). . Further, a knob 79 is provided at an end of a rod 78, which is a screw body through which bent portions 75a and 76a of the L-shaped arm with gauge 75 and the L-shaped arm with long hole 76, which are opposite to the tip apex of the piston rod 72, are passed. Is provided
The rod 78 is a bent portion 75a of an L-shaped arm 75 with a gauge.
It is idle and immovable in the axial direction, and is screwed and attached to the bent portion 76a.

Therefore, the knob 79 is rotated to rotate the L with the long hole.
When the character arm 76 is moved, the maximum contracted position of the piston rod 72 is restricted. The amount of rotation of the knob 79 can be set by a mark provided on the L-shaped arm 76 with a long hole and a scale provided on the L-shaped arm 75 with a gauge, and the cutting height of lawn can be easily adjusted.

If the ground is soft, the mid-mower 47 may fall due to its own weight during lawn mowing work of the tractor, and the lawn may be damaged.
Although there is a risk that the rotary blade may touch the ground and be damaged, due to the above configuration, it is possible to regulate the lowering position of the lawn mowing height by the shrinkage regulating member 74 of the piston rod 72.
Since the shrinkage restricting member 74 of the piston rod 72 of the cylinder 71 can be retrofitted to an existing tractor, there is an advantage that it can be additionally installed if necessary.

In the tractor equipped with the front mower 15 shown in FIG. 1 or the mid mower 47 shown in FIG. 6, universal joints 25, 26 (FIG. 3) or 61, 63 are used in the link mechanism 16 or 48. But universal joints 25, 26 or 61, 63
Is not a problem when it is not rotating, but the maximum operating bending angle θ (Fig. 6) during driving rotation is fixed, and when working at a bending angle θ larger than that, abnormal vibration occurs or the universal joint 25, 26 or 61 , 63 may be damaged.

Therefore, for example, in the tractor shown in FIG. 6, when the operation bending angle θ of the universal joint 61 exceeds a certain value, a predetermined rising position detection including a limit switch is detected on the lower surface portion of the vehicle body 2 with which the rotary shaft portion 65 of the rotary blade comes into contact. Sensor 8
1 (Fig. 9) is placed and the universal joint 6
The magnitude of the bending angle θ of 1 should be electrically detected. The operation of the predetermined rising position detection sensor 81 controls the movement of the working machine during lawn mowing by the relay so that the bending angle θ of the universal joint 61 does not become abnormal. At this time, the solenoid of the hydraulic circuit for controlling the operation of the cylinder 71 is connected to the relay.

FIG. 9 shows an example of the mower up-stop circuit. A switch consisting of one coil and one switch (one is N
O (S2) and one NC (S1) are arranged in parallel. If the switch that is the drive detection sensor 80 of the PTO (for lawnmower operation) is on and the switch that is the predetermined lift position detection sensor 81 of the mower lift is on, a current flows through the relay R2. When a current flows through the relay R2, the switch S2 closes the contact, and regardless of the position of the lift switch 83, a current is passed through the solenoid (lower) 82 that switches the hydraulic circuit, and the mower 47 is switched in the lowering direction. Moor 4
When 7 is lowered, the predetermined lift position detection sensor 81 of the mower lift is turned off. That is, the mower is lowered to a position where it does not hinder the drive rotation of the power transmission joint 62 during the cutting operation, and the bending angle θ of the universal joint 61 remains small. At that time, when the lift switch 83 is pushed to the raised position, a shunt current is generated. Therefore, the relay R1 and the switch S1 are arranged for prevention, and while the relays R2 and S2 are operating, the lift solenoid (up ) 84 is canceled.

Further, for example, a sensor, which is a potentiometer for continuously detecting the suspension height of the mower 47, is provided on the swing base of the lift link mechanism 48 (for example, the installation part of the link 49 of FIG. 6 on the vehicle body 2), and The suspension height position of the mower 47 is automatically detected from the signal, and depending on the ON / OFF of the drive detection sensor 80 of the PTO within the preset upper limit position or lower limit position of the suspension height of the mower 47. You may employ | adopt the structure which controls a raising / lowering height position automatically. FIG. 10 shows an example of a mower suspension height control circuit.

A sensor 8 for detecting the hanging height of the mower 47.
In the case where the control device 93 sets the upper limit position and the lower limit position in 5, when a signal is transmitted at the upper limit position of the mower 47, a current is passed through the raising solenoid 86 to cause the mower 47 to move.
When a signal is transmitted at the lower limit position of
Apply current to 7. The switches S1 '(NC) and S2' (NC) corresponding to the solenoids 86 and 87 are shown in FIG.
When the mower 47 reaches the upper limit position or the lower limit position, the lifting lift solenoid S1 ′ or the lowering solenoid S2 ′ is shut off, and the vertical movement of the mower 47 is stopped. Sensor 85 for detecting the hanging height of the mower 47
When it detects that the mower 47 is currently within the upper and lower limit positions, the control device 93 detects the self position, and changes the suspension height of the mower 47 to the set upper limit position or the lower limit position. , Solenoids 86 and 87, respectively
Operate. It should be noted that when the suspension height of the mower 47 exceeds the upper limit at the time of ascending according to the setting, the solenoid 88 operates and returns to the ascending position. If it is less than the lower limit, the solenoid 89 operates to raise it to the lower limit position, thereby maintaining the safety when driving the power transmission joint 62.

Further, a shock sensor (not shown) for detecting a collision with an obstacle during traveling of the tractor is incorporated in the lift cylinder circuit using the lift solenoids 82 and 84 shown in FIGS. By incorporating a circuit in which the lift solenoids 82 and 84 do not operate when they are activated, the lift solenoids 82 and 84 do not oversense. Further, an inexpensive limit switch may be used instead of the expensive sensor 85 for detecting the hanging height of the mower.

[Brief description of drawings]

FIG. 1 is a side view of a tractor according to an embodiment of the present invention.

2 is a front view of the tractor of FIG. 1. FIG.

3 is a side view of the mower of the tractor of FIG. 1. FIG.

4 is an explanatory diagram of a mower gauge wheel cutting height adjusting device for the mower of the tractor of FIG. 1. FIG.

5 is an explanatory view of a mower gauge wheel cutting height adjusting device for the mower of the tractor of FIG. 1. FIG.

FIG. 6 is a side view of the tractor according to the embodiment of the present invention.

FIG. 7 is a plan view showing a mounting portion for mounting the mid mower on the tractor of FIG.

8 is a partially enlarged view of FIG. 7 (FIG. 8A) and FIG.
It is the figure which looked at the L-shaped arm with a long hole in (a) from the arrow A direction (FIG.8 (b)).

FIG. 9 is a mower up-stop circuit diagram of the tractor according to the embodiment of the present invention.

FIG. 10 is a suspension height control circuit diagram of the mower of the tractor according to the embodiment of the present invention.

FIG. 11 is a side view of a conventional tractor.

[Explanation of symbols]

1 Front Wheel 2 Body 3 Engine 6 Mission Case 7 Rear Wheel 10 Steering Seat 11 Handle 15, 47 Mower 15a Deck 16, 48 Link Mechanism 16a Suspended Link 16b Lower Link 17 Main Arm 17a Tip Cylinder 18 Gauge Wheel 19 Rod 19a Hole 20 Deck 20a Shaft 21 Roller 23 Rotating blade 24 Rotating shaft 25, 26, 61, 63 Universal joint 28 Power transmission joint 29, 71 Actuator (cylinder) 31 Suspending height adjustment shuff 31a, 31b Hole 31c Vertical groove 31d Connection portion 31e Fine Diameter part 31f Small groove 31g Stop ring 32, 33 Fork 36 Cotta pin 38 Spring pin 42, 45 Boss 42a Grease inlet 44 Collar 44a Opening 44b Inner diameter 46 Washer 49, 50 Link 51 Deck 52, 53 Wheel 55, 6 Pulley 58 V Belt 60 Center Pivot Shaft 62 Power Transmission Joint 65 Rotating Blade Rotation Shaft 66 Support Shaft 67 Arm with Long Hole 67a Long Hole 68a, 68b Arm 69 Supporting Member 71 Cylinder 72 Piston Rod 73 Connecting Shaft 74 Hanging Height Lower limit position regulation member 74 Shrinkage regulation member 75, 76 L-shaped arms 75a, 76a Bent portions 76a, 76b Long hole 78 Rod 79 Knob 80 Drive detection sensor 81 Predetermined raised position detection sensor 82, 84 Electric device (lift solenoid) 83 Lift Switch 85 Tilt angle detection sensors 86 to 91 Solenoid (electric device) 93 Control device 101 Shaft 101a pin hole 101b pin

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuo Enomoto             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. (72) Inventor Tomio Kiyokawa             No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department Co., Ltd. F term (reference) 2B083 AA02 BA12 BA15 DA02 HA05                       HA06 HA32 HA34

Claims (4)

[Claims] 1. A vehicle body 2 for supporting a front wheel 1 and a rear wheel 7, a mower 15 suspended below the vehicle body 2 and forward of the front wheel 1, and a link mechanism 16 for suspending the mower 15 on the vehicle body 2. And the linkage mechanism 16 includes a gauge wheel 18
An arm 17 for supporting the gauge wheel 18, a boss 45 provided at the tip of the arm 17, a suspension height adjusting shaft 31 for the mower 15 attached to the boss 45, and a shaft 31 sandwiching the boss 45. A mobile agricultural machine comprising a plurality of stackable collars 44 for adjusting the suspension height position of the mower 15 by being attached to and detached from above and below. 2. A vehicle body 2 for supporting front wheels 1 and rear wheels 7, a mower 47 provided below the vehicle body 2 and the mower 47.
And a cylinder 71 for adjusting the suspension height position of the mower 47 by the link mechanism 48 and a suspension height lower limit position for preventing the suspension height position of the mower 47 by the cylinder 71 from falling below the lower limit value. Regulation member 7
A mobile agricultural machine characterized by comprising: 3. A vehicle body 2 supporting front wheels 1 and rear wheels 7, mowers 15 and 47 provided below the vehicle body 2 and the mowers 15,
Link mechanisms 16, 48 for suspending 47 on the vehicle body 2 and electric devices 82, 84 for controlling actuators 29, 71 for driving the link mechanisms 16, 48 to adjust the suspension height position of the mowers 15, 47 are provided. In the moving vehicle, the mower cutting blade drive detection sensor 80 and the mowers 15, 47
Is provided with a predetermined rising position detection sensor 81
When 0 and 81 operate together, the actuators 29 and 71
A mobile agricultural machine comprising a control means for stopping the ascending operation of the electric motors via the electric devices 82, 84. 4. A vehicle body 2 supporting front wheels 1 and rear wheels 7, mowers 15, 47 provided below the vehicle body 2, and the mowers 15,
Link mechanisms 16, 48 for suspending 47 on the vehicle body 2 and electric devices 82, 84 for controlling actuators 29, 71 for driving the link mechanisms 16, 48 to adjust the suspension height position of the mowers 15, 47 are provided. In the moving vehicle, an inclination angle detection sensor 85 of a lift link, which is one of the members of the link mechanisms 16 and 48, is provided, and the inclination angles detection sensor 85 causes the mowers 15 and 47 to detect the upper limit position and the lower limit position. A mobile agricultural machine comprising a control device 93 for controlling the lifting and lowering operation of the actuators 29, 71 via the electric devices 82, 84 so that the actuators 29, 71 are located at a suspended height position therebetween.