JP2002120749A - Agricultural working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural working vehicle having less risk of a mud push phenomenon such as pushing the earth of a paddy field aside to a large extent even when the vehicle makes a spin turn. SOLUTION: A pair of left and a right running parts 2 are installed on the left and right side of a machine body, each consisting of a first a second 22, and a third wheel 21, 21, 22, 22, 23, 23 located in the front, center, and the rear, wherein the first wheels 21 or the third wheels 23 are made non-drive wheels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an agricultural work vehicle.

[0002]

2. Description of the Related Art Conventionally, as an embodiment of an agricultural work vehicle, there has been a configuration in which a traveling unit including a pair of left and right front and rear wheels is driven by four wheels with two pumps and two motors.

In such an agricultural work vehicle, a turning movement of the vehicle body is performed by giving a difference in speed between right and left running parts, and a sharp turn (so-called spinning) is performed by rotating the running parts in mutually opposite directions. Turn).

[0004]

However, in the above-described agricultural work vehicle, since both the front and rear wheels are farther away from the center of gravity and the center of rotation than the center of rotation, the turning resistance tends to increase. Was.

[0005] Therefore, particularly when performing a spin turn, the front and rear wheels slide sideways, causing a significant mud-push phenomenon in which the soil of the field is largely pushed to the side, resulting in a problem that the field is roughened.

On the other hand, when the wheel base (axle distance) is shortened, the overturning angle becomes small, and the problem of lack of stability remains.

An object of the present invention is to provide an agricultural work vehicle that can solve the above-mentioned problems.

[0008]

According to the present invention, a pair of left and right wheels including a front, a center, and a first, second, and third wheels are provided on the left and right sides of the body, respectively. A traveling portion is provided, and the first or third wheel on the left and right is made a non-drive wheel.

According to the present invention, the grounding portion of the non-driving wheel can be arranged at a position higher than the grounding portion of the driving wheel.

According to the present invention, the non-driving wheels can be moved up and down in conjunction with a steering operation.

Further, according to the present invention, the first, second, and rear portions are provided at the front portion, the center portion, and the rear portion, respectively, on the left and right sides of the body.
A pair of right and left running parts including a third wheel is provided, and the first or third wheel on the left and right is a caster wheel.

[0012]

Embodiments of the present invention will be described below.

[0013] The agricultural work vehicle according to the present invention is provided with a pair of left and right traveling parts comprising first, second, and third wheels at the front, center, and rear of each of the left and right sides of the body. One or third wheels are non-drive wheels.

That is, from a different viewpoint, a pair of left and right non-driving wheels is added to the front or rear of the left and right front and rear wheels serving as the driving wheels. The rear side may be determined as a non-drive wheel with a wheel that is farther from the center of gravity of the machine centered on the center second wheel that is necessarily a drive wheel.

That is, the non-drive wheels function only as auxiliary wheels, so that the overturning angle of the vehicle body can be increased and the running stability, particularly the stability during turning, can be improved.

Further, the grounding portion of the non-driving wheel can be arranged above the grounding portion of the driving wheel.

With this configuration, when turning, the drive wheels near the position of the center of gravity of the machine share the turning drive, and the two non-driven wheels have a large side slip, but the sharing load is reduced and the tire surface pressure is naturally reduced. Since the size is reduced, mud pushing is reduced, and good turning performance can be obtained without damaging the field.

When the grounding portion of the non-driving wheel is located above the installation portion of the driving wheel, the non-driving wheel may be fixed, or may be configured to be vertically movable in association with the steering operation. Can also.

Further, only the non-drive wheels may be provided with a suspension so that they can escape upward when receiving a load.

The form of the non-drive wheels may be caster wheels. That is, the left or right first or third wheel is a caster wheel.

In the case of a caster wheel, there is no turning resistance because the wheel is automatically steered so as to be directed to the center of turning at the time of turning. Almost disappears.

As described above, a pair of right and left running parts including the first, second and third wheels are provided at the front, center and rear portions on the left and right sides of the body, respectively. Since the wheels are caster wheels that are not driven wheels, the wheelbase (axle distance) / tread (wheel distance) ratio is smaller, the turning resistance is lower, and the wheel sides are smaller than those with a structure in which all six wheels are fixed. It is possible to provide a vehicle having a good turning performance with little mud pushing on the vehicle.

[0023]

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

FIG. 1 is a side view of an agricultural work vehicle according to this embodiment.

The agricultural work vehicle A according to this embodiment has first and second tires mounted on the left and right sides of the body frame 1, respectively.
There is provided a traveling part 2, in which second and third wheels 21, 21, 22, 22, 23, 23 are arranged in order from the front side.

On the body frame 1, a driving unit 3 is provided at a front portion, and a motor room 4 containing a motor unit and a transmission unit (not shown) is provided at a rear portion thereof. , A guard frame 5 having a substantially rectangular shape in a plan view is provided from the motor frame 4 to the engine room 4. 30 is the driving section 3
The steering column, standing at the front of
It is a steering handle attached to the upper end of the.

At the rear of the body frame 1, there is provided a lifting link 6 to which a hitch body 61 for connecting a working machine such as a cultivator is attached, and between the middle part of the lifting link 6 and the guard frame 5. The lifting cylinder 7 is interposed.

In the agricultural work vehicle A having the above configuration, the gist of the present invention is that the first, second, and third wheels 21, 21, 22, 22
Out of 2,23,23, left and right first wheels 21,21 or third wheels
23,23 are non-drive wheels.

That is, the agricultural work vehicle A according to the present embodiment
Is in the form of a six-wheeled vehicle, of which the front wheels,
Four of the first and second wheels 21, 21, 22, and 22 serving as central wheels are used as drive wheels, and two wheels of third wheels 23 and 23 serving as rear wheels are used as non-drive wheels.

That is, first and second wheels 2 serving as driving wheels
The third wheels 23, 23, which are non-drive wheels, are added behind 1,21,22,22.

The non-driven wheels are third wheels 2 which are rear wheels in this case.
3, 23, but there are also cases where the first wheels 21, 21 serving as the front wheels are used, and which one is used as the non-drive wheel is inevitably determined by the center second wheel 22, 22 serving as the drive wheel. And machine weight center position G
The wheels that are farther away are non-drive wheels.

In addition, the traveling section 2, 2 includes first and second wheels 21, 21, 22, 22, which are driving wheels, and a first, second, driving shaft.
・ Attached to the second axles 24 and 25 and connected to the transmission unit via a transmission mechanism.

Therefore, the right and left traveling parts 2, 2 can be individually driven, and if the traveling parts 2, 2 are rotated in mutually opposite directions, a sharp turn called a so-called spin turn is also possible. It is also possible to change directions in a narrow place, thereby improving workability in a field or the like.

At the time of a turning run including such a sharp turn,
The third wheels 23, 23, which are non-drive wheels in the present embodiment, function only as auxiliary wheels, so that the overturn angle of the vehicle body can be increased, and running stability, particularly, stability during turning, is improved. be able to.

Further, as shown in the figure, the ground contact portions 23a, 23a of the third wheels 23, 23, which are non-driving wheels, are connected to the first wheels 23, 23, which are driving wheels.
The second wheels 21, 21, 22, 22 are located above the grounding portions 21a, 21a, 22a, 22a.

In this embodiment, the first, second and third wheels 21, 2
1, 22, 22, 23 and 23 have the same tire diameter, and the mounting shaft 26 of the third wheels 23 and 23 is provided above the first and second axles 24 and 25 by a distance h.

Therefore, when the vehicle turns, the first and second wheels 21, 21, 22, and 22 which are close to the machine center of gravity position G share the turning drive. Since the load is reduced and the surface pressure of the tire is also reduced, the mud pushing is reduced, and good turning performance can be obtained without damaging the field.

Since the third wheels 23, 23 function as auxiliary wheels, the wheel base (wheel base) is substantially the first wheel.
The distance between the wheel 21 and the second wheel 22 is short, so that the wheelbase (axle distance) / tread (wheel distance) ratio is reduced, the turning resistance is small, and the turning performance is also small and the turning performance is high. .

The first and second axles 24, 25 and the third wheel 2
When setting the mounting positions of the mounting shafts 26 of 3 and 23 at the same
By making the diameters of the wheels 23, 23 smaller than the diameters of the first and second wheels 21, 21, 22, 22, 22, the grounding portions 23a, 23a of the third wheels 23, 23
Grounding portions 21a, 2 of first and second wheels 21,21,22,22 which are driving wheels
It can also be located above 1a, 22a, 22a.

In the above embodiment, the third wheels 23, 23, which are non-drive wheels, are fixed, but the grounding portions 23a, 23a of the third wheels 23, 23 are the first and second drive wheels. Two wheels
In order to be positioned above the grounding portions 21a, 21a, 22a, 22a of 21, 21, 22, 22, for example, as shown in FIG. It can also be configured. In the figure, reference numeral 81 denotes a wheel swing bar, and a swing shaft 82 provided with the base end of the bar 81 behind the second wheels 22,22.
To the end of the bar 81,
Is installed. The rod end 83 of the hydraulic cylinder 8 is located between the swing shaft 82 and the mounting shaft 26 of the third wheel 23.
Are linked.

Further, in this case, the third wheels 23, 23 may be moved up and down so that the hydraulic cylinder 8 is driven in conjunction with the steering operation of the steering handle 31 provided in the driving section 3.

In this way, by linking with the steering operation, stable running with six wheels can be achieved when the vehicle is going straight, and as described above, the load shared by the third wheels 23, 23 is reduced when turning, and the tires Since the surface pressure is also reduced, good turning performance with less mud pushing can be obtained.

As shown in FIG. 3, the third wheels 23, 23
Only the suspension can be configured with a suspension.
That is, the suspension 9 is connected to the wheel swing bar 81 instead of the hydraulic cylinder 8 described above. Reference numeral 91 denotes a connecting portion between the suspension 9 and the wheel swing bar 81.

Further, as another embodiment, the third wheels 23, 23 serving as non-drive wheels may be caster wheels.

FIG. 4 is an explanatory plan view of the vehicle body frame 1 and the traveling portions 2, 2 according to the present embodiment. In the present embodiment, the first wheels 21 ', 21', which are front wheels, are non-drive wheels made of caster wheels. That is, in FIG.
The right side is the traveling direction, and the first wheels 21 ', 21' serving as front wheels are caster-type non-drive wheels, and the second and third wheels 22, 22, 23, 23 serving as center wheels and rear wheels are formed. The drive wheels are linked to the transmission M. In this case, the machine weight center position G
Is located between the second wheels 22,22 and the third wheels 23,23.

As shown in the figure, the driving force transmission structure is configured such that the driving shaft case is provided from the left and right rear portions of the transmission portion M, respectively.
Extend the left and right drive shafts 43, 43 into the respective drive shaft cases 42, 42, and provide the drive sprockets 44, 44 at the outer ends of both drive shafts 43, 43. A second transmission chain 46, between the driving sprockets 44, 44 and second input sprockets 45a, 45a disposed inside sprocket mounting cylinders 45, 45 provided at the outer end of the second axle 25. It has 46 turns.

Further, the sprocket mounting cylinders 45, 4
Third axle transmission sprockets 45b, 45b arranged outside of 5
The third transmission chains 48, 48 are wound between the first transmission sprockets 47, 47 provided at the outer ends of the third axles 26 ', 26'.

With this configuration, four wheels can be driven for the second and third wheels 22, 22, 23, and 23 of the right and left traveling sections 2, 2.

On the other hand, the first wheels 21 ', 2 which are caster wheels
As shown in the drawing, 1 'is a pair of substantially L-shaped caster supports 11, 11 connected to the front ends of a pair of left and right longitudinally extending frame forming pieces 10, 10 extending in the longitudinal direction of the vehicle body frame 1. And caster shafts 27,2 at the outer ends of the supports 11,11.
7 is rotatably inserted and supported.

The first wheel 21 'comprising such caster wheels,
21 'not only functions as an auxiliary wheel,
As shown in (a) and (b), at the time of turning of the vehicle body, it is automatically turned to the turning center Q, and furthermore, it is automatically steered in a direction substantially perpendicular to the turning center Q, so that turning resistance and In particular, during turning such as a spin turn, there is almost no mud pushing to the side.

Also in this case, since the first wheels 21 'and 21' function as auxiliary wheels, the wheel base (axle distance) is substantially the distance between the first wheel 21 and the second wheel 22. As a result, the wheelbase (wheel axle) / tread (wheel distance) ratio becomes smaller, the turning resistance becomes smaller, and an agricultural vehicle with less turning and high turning performance is obtained.

5 (a) and 5 (b) show a counterclockwise turning state, but in FIG. 5 (a), the inner traveling portion 2 in the turning direction is moved to the outer side. This is a case where the vehicle decelerates by rotating in the same direction as the traveling unit 2 and makes a large turn.

On the other hand, FIG. 5 (b) shows a case where the inner running part 2 is rotated in the decelerating state in a direction opposite to the outer running part 2 with respect to the turning direction to perform a sharp turn, that is, a so-called spin turn. is there.

[0054]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the first, second, and third parts are provided at the front, center, and rear of the body, respectively.
By providing a pair of right and left running parts consisting of wheels and the left or right first wheel or third wheel as non-driving wheels, the wheels serving as non-driving wheels can function as auxiliary wheels to the last. The stability at the time of turning can be improved by increasing the overturning angle.

According to the second aspect of the present invention, the grounding portion of the non-driving wheel can be disposed above the grounding portion of the driving wheel. Sharing the turning drive, the sideslip increases for the two non-driven wheels, but the shared load is reduced, and the surface pressure of the tires is also reduced naturally, so mud pushing is reduced and it is good without damaging the field Turning performance can be obtained.

According to the third aspect of the present invention, since the non-driven wheels are configured to be able to move up and down in conjunction with the steering operation, there is no possibility that the turning performance is improved and the straight running performance is impaired.

According to the fourth aspect of the present invention, the first, second, and third portions are provided at the front, center, and rear of the body, respectively.
By providing a pair of right and left running parts consisting of wheels and the left and right first wheels or third wheels as caster wheels,
At the time of turning, the third wheel is automatically steered so as to be directed to the turning center, so that there is no turning resistance. Especially during turning such as a spin turn, there is almost no mud pushing to the side. Also, because it is a caster wheel, it is a non-drive wheel,
The effects described above can also be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of an agricultural work vehicle according to an embodiment.

FIG. 2 is a side view of an agricultural work vehicle according to a modification of the embodiment.

FIG. 3 is a side view of an agricultural work vehicle according to a modification of the embodiment.

FIG. 4 is an explanatory view in plan view of a vehicle body frame and a traveling unit of an agricultural work vehicle according to another embodiment.

FIG. 5 is an explanatory diagram showing a state of automatic steering of caster wheels when the agricultural work vehicle turns.

[Description of Signs] A Agricultural work vehicle 1 Body frame 2 Running part 21 First wheel 22 Second wheel 23 Third wheel

Claims (4)

[Claims] 1. A pair of right and left running parts comprising first, second, and third wheels at a front part, a center part, and a rear part are provided on left and right sides of an airframe, respectively, and left and right first wheels or third wheels are provided. An agricultural work vehicle having non-drive wheels. 2. The non-driving wheel grounding portion can be arranged at a position higher than the driving wheel grounding portion.
The agricultural work vehicle described. 3. The agricultural work vehicle according to claim 2, wherein the non-driven wheels are configured to be vertically movable in conjunction with a steering operation. 4. A pair of left and right running parts comprising first, second and third wheels at a front part, a center part and a rear part are provided on each of the left and right sides of the body, and the left and right first wheels or third wheels are provided. An agricultural work vehicle having caster wheels.