JPH07213117A - Traveling vehicle for agriculture - Google Patents

Abstract

PURPOSE:To provide a traveling vehicle for agriculture, capable of being selectively combined with a planting machine or another working machine and applicable, e.g. to a tilling work, a seedling-planting work or an applying work of a fertilizer, a herbicide or an agrochemical. CONSTITUTION:This traveling vehicle is equipped with an engine 50 at the longitudinal middle part of the machine body and an output shaft is projected from the engine toward the forth and the back. The traveling system and the planting machine are driven by the first output shaft 54 of the engine projected forward and other working machines except the planting machine are driven by the second output shaft 55 of the engine projected toward the back.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural traveling vehicle in which a planting work machine or another work machine is detachably mounted on the rear part of a machine body.

[0002]

2. Description of the Related Art In-field work for rice cultivation includes cultivating work in the field, planting seedlings, and spraying fertilizers / herbicides / pesticides. Generally, farmers usually use a tiller for cultivating work and a rice transplanter for planting work.However, additional fertilizer, herbicide spraying, pesticide spraying, etc. required between planting and mowing are performed. At present, the middle management work is carried out exclusively by hand. Currently, there are many part-time farmers, and this intermediate management work is a heavy burden on farmers, and mechanization of this is desired. Further, if a large-scale towed cultivator is to be introduced in order to improve the efficiency of the tilling work, a tractor for pulling the large-sized cultivator is also required, which causes an increase in economic burden.

[0003]

Therefore, an agricultural traveling vehicle which can be selectively attached with a planting work machine or other farm work machines and which can be used not only for planting work of seedlings but also for tilling work and intermediate management work. Expectations for are increasing. In developing this type of agricultural traveling vehicle, the following points are issues.

That is, the planting work machine must be driven at a speed proportional to the vehicle speed in order to keep the seedling planting interval constant. On the other hand, work machines other than work machines with planting
In order to obtain stable workability, it is desirable to always drive at a constant speed. Therefore, two working machine drive outputs (PTO) for driving the working machine are required, and it is important to make the configuration suitable for it.

[0005]

In order to solve the above-mentioned problems, the present invention has the following constitution. That is, the agricultural traveling vehicle according to the present invention is an agricultural traveling vehicle in which a planting work machine or another work machine is detachably mounted on the rear part of the machine body, and the engine is mounted in the front-rear center part of the machine body. The output shaft is projected forward and backward from the vehicle, the traveling system and the planting work machine are driven by the first engine output shaft projecting forward, and the work other than the planting work machine is driven by the second engine output shaft projecting rearward. It is characterized by being configured to drive the machine.

[0006]

[Function] Since the working machine drive output for the planting work machine is taken out from the first engine output shaft via the traveling transmission, the planting work machine is driven at a speed proportional to the vehicle speed to plant the seedlings. The attachment interval is kept constant. On the other hand, since the working machine drive output for working machines other than the planted working machine is directly taken out from the second engine output shaft, the working machine is always driven with a constant load regardless of the vehicle speed, and stable workability is obtained. . Further, by mounting the engine in the front-rear center of the airframe and projecting the first engine output shaft forward and the second engine output shaft rearward from the engine, the transmission system is simple and balanced. Good placement.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below.

This agricultural traveling vehicle 1 is a four-wheel drive vehicle, and is a pair of left and right front wheels 2, 2 and rear wheels 3, which are drive wheels.
Equipped with 3.

The main frame of the machine body is such that the transmission case 5 provided at the frontmost part of the machine body and the front axle cases 6 and 6 provided behind it are connected by the front frames 7 and 7, and further, the front axle cases 6 and 6 are connected. The rear frames 8 are provided rearward from the back surface, and the rear end portions of the rear frames 8 are connected by a horizontal frame 9. The casing of the mission case 5 has a structure in which it is divided into front and rear parts 5a and 5b, and the front frames 7 and 7 are fixed to the rear surface of the rear casing 5b. Maintenance of the detachment mission is possible.

The front final case 11, which is provided at the end of the front axle cases 6 and 6,
The front wheels 2, 2 are attached to front wheel axles 2 a, 2 a protruding from the lower end outer side portion of 11. As shown in FIG. 5, the front final case 11 is a front axle case 6
The upper case 12 and the lower case 13 supporting the front wheel 2 are integrally formed with each other.
3 is slidable up and down and rotatable about the central axis. A front wheel transmission shaft 15 penetrating vertically is supported in both cases 12 and 13. An upper portion of the front wheel transmission shaft 15 is transmission-coupled to a front axle 6a in the front axle case 6 by gears 17 and 18, and a lower portion thereof is connected. The front axle 2a is transmission-coupled with gears 20 and 21.

In the upper case 12, a cylinder 23 is integrally provided on an outer peripheral portion of a cylindrical portion 12a that houses the front wheel transmission shaft 15, and an annular cylinder chamber 24 is formed between the cylindrical portion 12a and the cylinder 23. ing. This cylinder chamber 2
The piston 4 is partitioned by a piston 25, and is kept airtight with the outside. A suspension spring 26 is interposed between the piston 25 and the step portion 13a of the lower case 13. By moving oil into and out of the cylinder chamber 24 by the hydraulic device 28, the piston 25 slides up and down between the cylinder portion 12a and the cylinder 23, and the lower case 13 moves up and down with respect to the upper case 12 to move the front wheel 2 , 2, the height of the aircraft changes. The front final case 11
The gear 17 is spline-fitted to the front-wheel transmission shaft 15 so as to be slidable up and down in order to adapt to the change in the length.

Steering arms 30 and 30 are fixed to the outer peripheral portions of the lower cases 13 and 13. The tip ends of the steering arms 30 and 30 and the left and right end portions of a pitman arm 32 provided below the steering case 31 are provided. They are connected by tie rods 33, 33. When the steering wheel 72, which will be described later, is operated, the gear mechanism in the steering case 31 decelerates to rotate the pitman arm 32, and the left and right front wheels 2 and 2 are deflected.

A rear wheel rolling shaft 40 having an axial center oriented in the front-rear horizontal direction is fixedly fitted to the left and right central portions of the horizontal frame 9, and the rear wheel frame 41 is fitted to the protruding portion of the rear wheel rolling shaft.
Is supported for rolling freely. Rear axle cases 43, 43 are integrally provided on the rear sides of the left and right end portions of the rear wheel frame 41 via mounting metals 43a, 43a, and the swing case 4 is provided on the outer side of the rear axle case.
4, 44 are rotatably provided, and the rear wheels 3, 3 are attached to the rear wheel axles 3a, 3a protruding outward from the outer end portion of the front wheels. Then, the piston side of rear wheel elevating cylinders 47, 47, whose bases are pivotally attached to columns 46, 46 protruding upward from the left and right ends of the rear wheel frame 41, are connected to the swing cases 44, 44. By expanding and contracting the rear wheel elevating cylinders 47, 47, the swing cases 44, 44 rotate up and down, and the rear wheels 3, 3 with respect to the machine body.
Height changes. The rear wheel lift cylinders 47, 47 are controlled by a rear wheel lift valve 48 (see FIG. 6).

The swing range of the swing cases 44, 44 is within the range of α in FIG. 2, and when the rear wheels 3, 3 are raised (the body is lowered), the rear wheels 3, 3 rotate about the swing cases 44, 44. It is located in front of. At that time, the mounting metal 43 of the rear axle case 43, 43
a, 43a, swing cases 44, 44, and rear wheel lifting cylinders 47, 47 are arranged in a triangle in a side view, and the force applied to the swing cases 44, 44 is applied to the rear wheel lifting cylinder 4
Since it is shared and supported by 7, 47, the structure has sufficient rigidity.

The engine 50 includes left and right rear frames 8,8.
It is mounted in the middle of the fuselage between the front and rear. A radiator 51 is provided on the rear side of the radiator 51. Further, a fuel tank 52 is provided behind it at substantially the same height as the rear frames 8, 8.

The engine 50 includes a first engine output shaft 54 protruding forward and a second engine output shaft 5 protruding rearward.
It is equipped with 5. The rotational power extracted from the first engine output shaft 54 is transmitted to the mission in the mission case 5 via the HST 56. And HST56
And the power changed in the mission is transmitted to the front axles 6a, 6a by the front wheel drive shaft 58 and to the rear wheel drive shaft 5
It is transmitted to the rear axles 43a and 43a by 9, 59, respectively, and is transmitted to the planting clutch 61 by the first working machine drive shaft 60. A planted PTO shaft 61a and a fertilizer application PTO shaft 61b are provided as output shafts of the planted clutch 61. On the other hand, the rotational power taken out from the second engine output shaft 55 is directly transmitted to the load work clutch 63 by the second work machine drive shaft 62 without shifting. Load work PTO as output shaft of load work clutch 63
A shaft 63a is provided. In FIG. 1, reference numeral 65 is a front differential device, and 66 is a rear differential device.

The control seat 70 is installed on an engine cover 71 that covers the upper side of the engine 50. In front of it, the steering handle 72, various operation levers 73, ...
The operation pedals 74, ..., And the instrument panel 75 are provided. The work implement lifting lever 73 (1) is provided on the side portion of the seat 70. The operating mechanism, wiring, etc. are covered with a front cover 77. Around the lower part of the engine cover 71 and the front cover 77, a horizontal floor step 78 is formed, on which the operator can walk or the like.

At the rear of the machine body, upper links 80, 80 and a lower link 8 for mounting the working machine in a vertically movable manner.
1, 81 are provided. These links 80, 80,
The bases 81 and 81 are rotatably attached to a link base frame 82 erected on the horizontal frame 9, and a link frame 83 for attaching a planting work machine or another work machine is attached to the tip side thereof. The hitch 84 is connected. A work machine lifting cylinder 87 is interposed between the support members fixed to the rear frames 8 and 8 and the upper links 80 and 80. By expanding and contracting the cylinder, the upper links 80 and 80 rotate up and down. , The work machine moves up and down with a certain posture. The working machine lifting cylinder 87 is controlled by a working machine lifting valve 88 (see FIG. 6).

The bases of the upper links 80,80 and the lower links 81,81 are left and right rear axle cases 43,4.
Since the links are arranged in the space between 3 and the rear axle case does not interfere with each other in a plan view, the pivot fulcrum of the links can be lowered and the airframe can have a low center of gravity. ing.

The working machine lifting lever 73 is used for raising and lowering the working machine.
Operate in (1). When the work implement lift lever 73 (1) is in the neutral position, oil does not flow to the work implement lift valve 88, and the work implement lift lever 73 (1) is rotated upward with the "work implement fixed" operation. The oil flows in the direction in which the machine lifting cylinder 87 extends to “work machine up”, and when the work machine lifting lever 73 (1) is rotated downward, the oil flows in the direction in which the work machine lifting cylinder 87 contracts “work machine down”. It will be.

The work implement lift lever 73 (1) is also linked to the rear wheel lift valve 48, and the work implement lift lever 7
When 3 (1) is operated to "raise the work implement", the rear wheel raising / lowering valve 48 is switched in the direction in which the rear wheel raising / lowering cylinders 47, 47 extend. Therefore, the planting work machine 90
At the time of rice planting work with wearing the, when the planting work machine 90 is lifted when turning the machine body at the end of the field or the like, at the same time, the rear wheels 3 and 3 descend to the machine body and the machine body posture is lowered frontward. The front part of the machine body does not lift, and stable turning is possible. Further, by lowering the rear wheels 3 and 3 with respect to the machine body, the lift amount of the planting work machine 90 is larger than the lift only by the links 80, 80, 81, 81. Therefore, the machine body is swung in the vicinity of the ridge. Also, the planting work machine 90 is less likely to come into contact with the ridge. Therefore, it is possible to reduce the area of the non-planting portion (headland) accompanying the turning on the edge of the ridge. Furthermore, since the lifting motion of the aircraft is quick, the float 90a,
The mud pushing by 90b and 90b can be reduced as much as possible.

The agricultural traveling vehicle 1 is constructed as described above, and the vehicle height is adjusted by raising and lowering the wheels 2, 2, 3, 3 with respect to the machine body in accordance with the purpose of work.

When used as a rice transplanter, as shown in FIG. 2, the vehicle height is lowered and the link frames 83 are attached to the upper links 80, 80 and the lower links 81, 81, and the planting work machine is attached to the link frames. 90 can be freely rolled.
The planting work machine 90 is driven via a planting drive shaft 91 connected to the planting PTO shaft 61a. In addition, planting work machine 9
0 is equipped with a center float 90a for leveling and side floats 90b, 90b, and moves the planting work machine 90 up and down according to the unevenness of the field scene detected by the center float 90a so that the planting depth of seedlings is always constant. Is configured to maintain.

When performing fertilization work at the same time as planting work, a fertilizer application device 93 is installed on the rear side of the control seat 70, and fertilizer fed from the hopper 93b by the feeding device 93a is passed through the fertilization hoses 93c. It should be guided near the side of the planting position. The feeding device 93a, ... Is the fertilizer application P
It is driven from the TO shaft 61b via a fertilization drive mechanism (not shown).

When used for intermediate management work such as topdressing and spraying of chemicals, the vehicle height is increased and the upper links 80, 80 and the lower links 81, 81 are hitch 8 as shown in FIG.
4 and attach the spreader 100 to the hitch. The fertilizer application hoses 93c of the fertilizer application device 93 are connected to the spraying booms 100a of the spraying machine 100. A blower 100b for blowing air for transporting fertilizer or the like into the spray booms 100a, ... Is driven via a load work drive shaft 101 connected to the load work PTO shaft 63a.

When used for cultivating work, as shown in FIG. 4, the vehicle height is lowered, the hitch 84 is attached to the upper links 80, 80 and the lower links 81, 81, and the cultivator 110 is attached to the hitch. . This tiller 110 is also driven via the load work drive shaft 101 connected to the load work PTO shaft 63a.

[0027]

As described above, in the agricultural traveling vehicle according to the present invention, the planting work machine is driven at a speed proportional to the vehicle speed, and the working machines other than the planting work machine are always constant regardless of the vehicle speed. It can be driven by the load of the field, and can cultivate fields, plant seedlings, spray fertilizers, herbicides and pesticides, etc., and the transmission system is simple and well-balanced. Arranged.

[Brief description of drawings]

FIG. 1 is a plan view of an agricultural traveling vehicle.

FIG. 2 is a side view of a state where the agricultural traveling vehicle is used for fertilizing rice planting work.

FIG. 3 is a side view showing a state where the agricultural traveling vehicle is used for intermediate management work.

FIG. 4 is a side view of a state where the agricultural traveling vehicle is used for tilling work.

FIG. 5 is a front cross-sectional view of a front wheel support portion.

FIG. 6 is a hydraulic circuit diagram for lifting a link and lifting a rear wheel.

[Explanation of symbols]

 1 Agricultural traveling vehicle 2 Front wheel 3 Rear wheel 5 Mission case 50 Engine 54 First engine output shaft 55 Second engine output shaft 56 HST 90 Planted work machine 100 Spreader 110 Tiller

Claims (1)

[Claims] 1. In an agricultural traveling vehicle in which a planting work machine or another work machine is detachably attached to the rear part of the machine body, an engine is mounted in the front-rear center part of the machine body, and the engine outputs forward and backward. The shaft is projected, and the traveling system and the planting work machine are driven by the first engine output shaft projecting forward,
An agricultural traveling vehicle characterized in that the second engine output shaft protruding rearward is configured to drive a working machine other than the planted working machine.