JP2002291305A - Four wheel type vehicle for tilling operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a large change in front and rear balance using a rear axle as the fulcrum between the time of the operation by lowering an implement, and the time of lifting the implement in a flowing walking state, i.e., a large change of handle load, largely affects the fatigue of an operator in a small-type working vehicle in both of sulky and walking types, having a machine body of a four-wheel type steered by the front wheels and driven by the rear wheels, the implement attached by a mid-mount type to be mechanically lifted and lowered, and operation devices both in a boarded state and in a following walking state. SOLUTION: The link and the fulcrum of a hitch for attaching the implement are arranged so that the lifting and lowering locus of the attached implement may be moved nearly in the upper and lower direction in an operating range, and in the direction of going away from the front wheel rearward in a housing range. Means such as the one for movement of weight by opening and closing the driver's seat are used so as to correspond to the change of the balance in the sulky state and the following walking state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding / walking work vehicle capable of working in a driver's seat sitting state or in a state of following the body following walking.

[0002]

2. Description of the Related Art As a conventional technique, a work machine body abdomen-mounted type (mid-mount type) has a three-point hitch system in front of the work machine, which is the same as a tractor. The elevating trajectory is a backward trajectory, i.e., moving or drawing an arc on the right side of the circumference when viewed from the left side of the fuselage, or hanging by a pantograph method, and the elevating trajectory of the working machine generally moves almost up and down. is there.

[0003]

The walk-type cultivators and management machines are used in a field with a narrow road width, a steep hill or a step, and poor carrying conditions, a deformed small section, a soft field, and a narrow space between planting strips. It is often used for work in ridge fields, and requires detailed work in every corner of the field. In addition, since the traveling unit and the working unit are integrated, the reaction force received from the ground by the working unit must be supported by the fuselage, and when moving or turning in poor conditions, the operation of lifting the working unit must be performed manually. May be performed using Therefore, it is important to properly maintain the front-rear balance with the rear axle as a fulcrum in the following walking state, that is, the handle load, even in a small riding / combined tillage work vehicle. A large change depending on the state of the vehicle has a great effect on the driver's fatigue.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. That is, in claim 1, a front-wheel steering / rear-wheel drive four-wheel till having a steering device in a driver's seat sitting state and a steering device in a body following state, and a tillage work machine hung on the abdomen of the body main body. In a work vehicle, that is, a small-sized, mid-mounted, riding-walking and cultivating work vehicle, the work machine mounting device 4 causes the elevating locus of the rotary shaft of the work machine to move substantially vertically in the work range, and rearward from the front wheels in the storage range. This is a tillage work vehicle that uses the function of moving in the direction of moving away, that is, the movement of drawing the left side of the circumference when viewed from the left side of the aircraft.

According to a second aspect of the present invention, when viewed from the side, the front wheel and the rear wheel move up and down within a range where they do not come into contact with the outer periphery of the rotary rotation in the working range. 5. The fulcrum according to claim 3, wherein the momentum is reduced by using the most general and durable link method so that the movement of the working machine moves to the left side of the circumference when viewed from the left side of the machine body. Positioning was used as a means.

According to a fifth aspect of the present invention, the driver's seat is turned back and forth around the lower front portion of the driver's seat in order to reduce the balance between the front and rear in the sitting state with the rear axle as the center and the balance in the walking state. In addition, a weight is detachably fixed to the rear of the driver's seat at the rear, and when maneuvering in a walking state, the driver's seat is tilted forward so that the weight moves greatly, and even a lightweight weight has a large front-back balance. Means to obtain an effect was used.

[0007]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. 1 is an overall side view of a four-wheel tillage work vehicle of the present invention, FIG. 2 is an overall plan view, FIG. 3 is an overall front view, FIG. 4 is a frame and hitch mounting side view, and FIG. 6 is a side view of a frame and a hitch mounting of another embodiment, and FIG. 7 is a plan view of the same.

First, the overall configuration of a four-wheel tillage work vehicle (hereinafter referred to as a work vehicle) equipped with the present invention will be described with reference to FIGS.
This will be described with reference to FIGS. The configuration of the work vehicle 1 includes a drive transmission device 2, a rear wheel 32, a frame 50, a front wheel device 3, a driver's seat 60, a front control device 5, a rear control device 6 in a walking state, and a work implement mounting device 4. And are placed. The drive transmission device 2 for moving the work vehicle 1 includes left and right rear wheels 32L and 32R extending diagonally rearward and rear axles 14L and 14R at the lower end portions of the left and right chain cases 13L and 13R having a power intermittent mechanism therein. And the upper rear ends of the left and right chain cases 13R and 13L are connected to the connecting pipe 12 respectively.
L and 12R are connected to the transmission case 11 and the engine 10 is arranged on the side of the upper extension of the transmission case 11 to form a front open rear connection.
The arrangement of the engine 10 is not particularly limited to the embodiment.

Frame 5 mainly composed of pipe members
In the case 0, the rear part of the lower frame 51 is bent in a U-shape along the drive transmission device 2, and the front part of the transmission case 11 and the chain case 13 through the connecting pipes 12L and 12R.
The lower part of the front wheel mounting pipes 54L and 54R is fixed to the left and right ends that extend forward while being fastened and fixed to the upper end of the L.13R upper surface, and installed parallel to a position higher than the lower frame 51 at the center of the fuselage. Upper frame 52L / 52R
Is fixed to the rear part of the lower frame 51, while the front end extending forward is fixed to the horizontal pipe 53, and the horizontal pipe 5
3 are fixed to the upper portions of the front wheel mounting pipes 54L and 54R, and the members of the lower frame 51 and the upper frame 52 are formed at positions passing through the trapezoidal intersection in front view. The extension length of the rotary tiller 40 is such that the rotary outer circumference 45 of the tillage implement 40 is close to the front wheel 31 and the rear wheel 32 in the rotary working position so as not to contact the front wheel 31 and the rear wheel 32.

In the front wheel device 3, front wheels 31L and 31R are rotatably mounted on the lower ends of the fork shafts 35L and 35R having a predetermined angle, and these are rotatably mounted on front wheel mounting pipes 54L and 54R of the frame 50, respectively. Into the fork shafts 35L and 35R and the tie rod arms 33L
33R, the tie-lot arm 33 is further oriented rearward, and the tie-lot 34 is rotatably engaged with the pins 36 at the rear end so as to synchronize the movement of the left and right front wheels 31L and 31R. ing. A steering handle 68 that steers the front wheel 31 in a seated state is rotatably inserted into the center of the horizontal pipe 53 at the front lower side at a position angle overlapping the front wheel mounting pipe 54 in a side view, and on the upper surface of the insertion section. An arm 69 parallel to the tie-rot arm 33 is fixed and the tip is engaged with the tie-lot 34, and the upper portion is extended upward and rearward to a position where the driver can easily steer, and is bent so that a moment is obtained. With stopper pin 2
It is regulated by 9L and 29R.

The front steering device 5 includes an upper frame 52L
Driver seat attachment bodies 57aL and 57aR fixed to 52R
The driver's seat 60 is attached to the driver's seat 57 so that the driver's seat 60 can be rotated back and forth around the driver's seat rotation fulcrum 70.
6 is detachably fastened and fixed, and a handle pipe 62 fastened and fixed to the lower frame 51 and the handle 61 is provided in the vicinity of the driver's seat 60, and a front main clutch lever 63 (in the embodiment, at the left front of the handle pipe 62). The main clutch arm 15 on the upper part of the transmission case 11 is provided through the main clutch lot 66.
And a front cultivation depth adjusting lever 64 for raising and lowering the work machine is provided on the right front side, and this movement is electrically connected to the work machine mounting device 4.
To the electric cylinder 41, and the front tillage depth adjusting lever 6
4, the front emergency stop button 65 is provided inside the vehicle, so that the front wheel is located at the position of the driver's seat 60 which is located near the center position of the body over a virtual line connecting the left and right rear axles 14L and 14R in side view. In addition to the steering of the steering wheel 31, it is possible to perform the minimum necessary operations such as intermittent running power, adjusting the working depth of the working machine, and stopping the emergency engine.

The rear steering device 6 has four handle attachment bodies 58aL and 58aR that fix the front lower portion of a loop-shaped handle 61 extending obliquely upward and rearward from below the driver's seat 60 to upper frames 52L and 52R.・ 58bL ・ 5
A main clutch lever 73 fixed to the main clutch arm 15 is engaged with the groove of the main clutch latch 77, and a PTO clutch lever 71 having a fulcrum at the main clutch latch 77. To the PTO clutch inside the transmission case 11, while on the right rear side, a cultivation depth adjusting lever 74 is provided to electrically transmit this motion to the electric cylinder 41, and further to the inside of the cultivation depth adjusting lever 74. Provided with an emergency stop button 75,
Further, side clutch levers 72L and 72R are provided on the lower left and right sides of the rear end of the handle 61, and an accelerator lever 78 is provided on the upper side of the side clutch lever 72R.
This is a configuration in which a shift lever 17 having a fulcrum at the upper portion and extending upward is arranged, and thereby, walking and maneuvering can be performed by the same operation as a walking-type tiller or management machine.

The work implement mounting device 4 includes an upper frame 52L.
Front link fulcrum seats 55L and 55R and rear link fulcrum seats 56L and 56R that are connected to 52R and extend downward and are provided side by side.
This is a device that is engaged with and attached to the lower end of the device. The structure is such that a hitch d body 4 in which one end of the front link 46L / 46R is engaged with the lower end of the front link fulcrum seat 55L / 55R and the other end is connected to the hitch c body 47cL / 47cR.
7d is engaged with the rear link fulcrum seats 56L and 56L.
One end of the rear link 43L / 43R is engaged with the lower end of the R, the other end is engaged with the right and left hitch c bodies 47cL / 47cR, and the front link 46L / 46R and the rear link 43L /
43R and a link lot 48L / 48R at the upper portion are engaged and synchronized and connected to each other, and a hitch a body 47 to which a tillage machine 40 is attached.
a is a configuration in which the two hitch b bodies 47bL and 47bR are connected to the hitch c bodies 47cL and 47cR.
On the other hand, the cylinder mounting bodies 59L and 59R that engage with the upper frames 52L and 52R via members and the upper part of the electric cylinder 41 are engaged, and the axis of the electric cylinder 41 passes above the hitch c body 47c and the distal end thereof. Hitch c body 47c
L. 47cR is engaged with the hitch e-body 47e.
7 moves in the left arc of the circumference.

Another embodiment of the work machine mounting device 4 will be described with reference to FIGS. The structure is the upper frame 52
The roller guides 85L and 85R are formed in a U-shape in a side view, and the rollers 81L and 81R are positioned in front of the top of the hitch and supported by a roller shaft 82 that is connected to the hitch d body 87d. At the same time, the crank arms 83L and 83R are engaged with the distal ends of the crank fulcrum seats 86L and 86R that are connected to the upper frames 52L and 52R behind the hitch a body 87a and extend downward. A hitch a body 87a which is engaged with a hitch c body 87cL / 83cR whose other end is connected to a hitch d body 87d and which mounts the tillage implement 40 is a hitch d body via two hitch b bodies 87bL / 87bR. 87dL ・ 8
This is a configuration combined with 7dR. On the other hand, the upper frame 52
Cylinder mounting body 5 connected to L · 52R via a member
9L / 59R and the upper part of the electric cylinder 41 are engaged, and the tip of the electric cylinder 41 is engaged with the hitch d body 87d. Each of the engaging portions has a smooth rotatable structure.

[0015]

The present invention has the above-described configuration,
The following effects can be obtained. That is, the front steering device 5 in the driver's seat sitting state, and the rear steering device 6 in the body following walking state in which the front of the body is lifted and turned around the rear wheels 32.
In a front-wheel steering / rear-wheel drive four-wheel tillage work vehicle in which a tillage work machine 40 is hung on the body abdomen between the front wheel 31 and the rear wheel 32, the rotary shaft elevating locus of the tillage work vehicle The work equipment mounting device has a structure that is almost vertical in the range and away from the front wheel in the storage range, so the change in the front-rear balance caused by the change in the front-rear position of the work equipment due to the tillage depth is small, and the tillage depth is also small. It is possible to obtain sufficient effects, and the working depth becomes wider according to the work content, and at the time of storage, the working machine approaches the rear axle.

Also, in side view, the tillage machine 40
At the time of lowering, the rear portion of the front wheel 31 and the rotary outer circumference 45 approach each other so as not to come into contact with each other.
And the rear wheel 32 are arranged to overlap with each other, so that the moment with respect to the rear axle of the tilling work machine is reduced, so that effects such as a reduction in handle load and a reduction in the overall length of the machine body can be obtained.

A front link fulcrum seat 55 fixed to the upper frame 52 at the abdomen of the fuselage body and extending downward and attached to the front and rear.
In a work implement mounting structure in which the hitch 47 is swingably engaged with the lower end of the rear link fulcrum 56 via the front link 46 and the rear link 43, the rear link fulcrum 56 is provided behind the hitch 47; The operation trajectory of the front link 46 and the rear link 43 is above the front fulcrum 90 and the rear fulcrum 91 from the front, or the roller guide 85 fixed to the upper frame 52 of the abdomen of the body shown in another embodiment, and the lower part At the lower end of the crank fulcrum seat 86, a roller 81 at the front and
In the working machine mounting structure in which the rear side of the hitch 87 is swingably engaged via the crank arm 83, the crank arm fulcrum seat 86 is provided rearward of the hitch 87, and the operating locus of the crank arm 83 is higher than the crank fulcrum 89. , The vertical trajectory of the rotary shaft 39 of the tillage machine is substantially vertical in the working range, and the front wheel 31 in the storage range.
The work machine mounting device has a structure moving in a direction of moving further backward, so that the overall length of the machine body can be shortened, the handle load can be appropriately maintained, and furthermore, the most general and durable link structure can be combined.

Further, the driver's seat mounting members 57aL, 57aR, 57b are provided on the upper frames 52L, 52R, and the driver's seat 60 is mounted so as to be rotatable back and forth around the driver's seat rotation fulcrum 70. The weight 76 is detachably fastened and fixed to the rear of the driver's seat rear, so it moves backwards when seated, and moves forward when the driver's seat is tilted forward while walking. The effect is obtained, and further, there is an effect that the field of view in front is easy to see.
By improving these balances, the handle load in the following walking state is properly maintained, the total length is shortened to almost the same size as the tiller, and it is possible to cultivate in a stable state near the ridge and to perform detailed work in every corner of the field In addition, it has become a small riding-walking-type work vehicle with the possibility of extending the tillage width and increasing efficiency in light work.

[Brief description of the drawings]

FIG. 1 is an overall side view of a four-wheel tillage work vehicle according to the present invention.

FIG. 2 is an overall plan view of the same.

FIG. 3 is an overall front view of the same.

FIG. 4 is a side view of a frame and a hitch attachment.

FIG. 5 is a plan view of the same.

FIG. 6 is a side view of a frame and a hitch attachment according to another embodiment.

FIG. 7 is a plan view of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 work vehicle 2 drive transmission device 3 front wheel device 4 work implement mounting device 5 front steering device 6 rear steering device 19 battery

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B62D 49/08 B62D 49/08 FF term (Reference) 2B041 AA07 AA15 AB04 AB05 AC03 CA07 CA14 CC02 CC08 CD13 2B304 KA08 LA01 LA02 LA06 LB04 LB13 PC12 RA09 RA21

Claims (5)

[Claims] The vehicle has a front steering device 5 in a driver's seat sitting state, a rear steering device 6 in a body following walking state in which the front of the body is lifted and turned around a rear wheel 32, and a front wheel 31 is provided.
In a front-wheel steering / rear-wheel drive four-wheel tillage machine with a tillage machine hung on the abdomen of the body of the machine between the and the rear wheels 32, the lifting locus 37 of the rotary shaft 39 of the work machine is substantially vertical in the working range. The tillage work vehicle described above, further comprising a work implement mounting device 4 having a structure in which the storage device is located away from the front wheels 31 in a storage range. 2. In a side view, the rear part of the front wheel 31 and the rotary outer circumference 45 are approached when the tillage work machine 40 is lowered at the lowest position, and the rotary rotary outer circumference 45 and the rear wheel 32 are arranged so as to overlap when the tillage work machine 40 is raised. The work vehicle according to claim 1, wherein: 3. A front link 46 and a rear link 4 are fixed to the upper frame 52 of the abdomen of the fuselage body, and extend downward and are provided at the lower ends of a front link fulcrum seat 55 and a rear link fulcrum seat 56 which are provided before and after.
3, the rear link fulcrum seat 56 is provided behind the hitch 47, and the operating trajectory of the front link 46 and the rear link 43 is adjusted to the front fulcrum 90 and the rear. The work vehicle according to claim 1, wherein the work vehicle is located above the fulcrum 91 from the front. 4. A roller guide 85 fixed to the upper frame 52 at the abdomen of the fuselage body and a hitch 87 extending downward at the lower end of a crank fulcrum seat 86 via a roller 81 and a crank arm 83 at the rear. 2. The work machine mounting structure in which the crank arm fulcrum seat 86 is provided rearwardly of the hitch 87, and the operating locus of the crank arm 83 is above the crank fulcrum 89 in the work machine mounting structure which is engaged. Working vehicle. 5. A driver's seat mounting body 57aL, 57aR is provided on the upper frame 52L, 52R, and the driver's seat rotation fulcrum 7 is provided.
0 enables the driver's seat 60 to rotate back and forth.
The work vehicle according to claim 1, wherein the weight (76) moves rearward when the driver is seated, and moves forward when the driver's seat (60) is tilted forward.