JP2000177650A - Traveling work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traveling work vehicle that can support a main body frame steadily by a front axle case and a rear axle case and can be maintained effectively. SOLUTION: In this travelling work vehicle, a front axle case connecting and supporting a right and a left front wheels 1a is attached at the front of a body frame 2 from the lower side so that they can be attached and removed freely. Also, a rear axle case supporting a right and a left rear wheels 1b is attached at the rear of a body frame 2 from the lower side so that they can be attached and removed freely. In addition, the front axle case 6a is attached from the front of the body frame 2 and the rear axle case 6b is attached from the rear of the body frame 2 to support the body frame 2, so that they can be attached and removed freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling work vehicle capable of installing a working device such as a spraying device for spraying a chemical solution or the like for controlling or a planting device for planting seedlings.

[0002]

2. Description of the Related Art Conventionally, a storage tank for storing a chemical solution and a chemical solution are delivered from the storage tank to a traveling body (traveling work vehicle) in which an engine and a control unit are installed from the front on a body frame having front wheels and rear wheels. There is already known a spraying work vehicle that is provided with a spraying device that includes a feeding pump and a spraying unit that sprays a delivered chemical solution from a nozzle provided on a wide boom to control rice and field crops in paddy fields. ing.

[0003] Such a spraying work vehicle pivotally supports a central portion of a front axle case having front wheels and a rear wheel and a rear axle case with respect to an airframe which integrally connects an engine and a transmission case. The rear axle case and the rear axle case are biased and supported so that they can rotate in the horizontal direction in the horizontal direction with respect to the aircraft frame, so that the aircraft can be maintained in a substantially horizontal posture without receiving a large impact against unevenness or inclination of the ground, etc. Can be performed smoothly.

[0004]

However, in the conventional support structure for the body frame, the weight of the body is concentrated mainly on the center of the front axle case and the rear axle case. Along with increasing the diameter to improve the strength, there is a disadvantage that the pivoting structure for rotating the balance is strong and complicated.

When the front axle case and the rear axle case are rotated left and right with respect to the fuselage, an attempt is made to obtain a predetermined ground clearance. There are problems such as.

[0006]

A traveling work vehicle according to the present invention for achieving the above object comprises a vehicle body frame 2 having a front wheel 1a and a rear wheel 1b, on which an engine 1c and a control section 3 are installed. In the car, the body frame 2
A front axle case 6a for connecting and supporting the left and right front wheels 1a to the front of the vehicle body 2 is detachably attached and supported from below, and a rear axle case 6b for connecting and supporting the left and right rear wheels 1b to the rear of the body frame 2 is mounted from below. It is configured to be detachably attached.

A front axle case 6a is detachably attached to the body frame 2 from the lower front side of the body, and a rear axle case 6b is detachably attached to the body frame 2 from the lower rear side of the body to support the body frame 2. It is configured to be. Further, the body frame 2 includes two body side frames 20, 20, a front side frame 21 and a rear side frame 2.
3 to support the vicinity of both ends of the front axle case 6a and the rear axle case 6b under the front and rear lower portions of the body frame 2.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a traveling work vehicle according to the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a spraying work vehicle, which is mounted on a body frame 2 having a front wheel 1a and a rear wheel 1b by covering an engine 1c from the front with a bonnet 1d, and behind the various operation levers and operations. An operation unit (operation panel) having a switch and the like, a control unit 3 including a handle 3a and a seat 3b, which will be described later, and a traveling work vehicle 1s including a transmission case 4 connected to the engine 1c by a transmission mechanism 10 and the like. On the other hand, a spraying part 5a which is attached to the front of the body so as to be able to ascend and descend and sprays a scattered substance such as medicine, a storage tank 5b mounted on the rear part of the body and stores the scattered matter, and a scattered substance from the storage tank 5b. And a feeder 5c (liquid feed pump) for sending the liquid, and the sprayer 5 is driven by itself.
Thereby, it is possible to efficiently spray the sprayed material over a predetermined width to crops in paddy fields or fields.

The detailed configuration and operation of each section will be described below. First, with reference to FIGS. 2 to 4, a description will be given of the body frame 2, its support structure, wheel transmission structure, and the like.

In the illustrated example of the body frame 2, two body side frames 20, which are main outer frames on the left and right sides of the body, are connected at front and rear ends thereof by a front horizontal frame 21 and rear horizontal frames 23, 23a.
The middle part is connected on the transmission case 4 by a downwardly U-shaped bracket frame 22, and the position of the control unit 3 is set to the horizontal frame 23.
Are connected by Therefore, a rectangular rigid frame enclosing the transmission case 4 in a plan view is formed, and further, a mounting piece 20b is provided at the rear of the control section 3 to form a receiving section, on which the storage tank 5b is attached and detached. It can be installed as much as possible. Further, the body frame 2 is
Auxiliary outer frame 20f is provided in parallel along the outside.

The body frame 2 formed as described above can be easily disassembled and mounted on the front axle case 6a, the rear axle case 6b, the transmission case 4 and the like by the following support structure 6. At the same time, the aircraft can be stably supported.

That is, a front axle case 6a connected to and supported by the left and right front wheels 1a with respect to the front portion of the body frame 2 is supported by being moved from the front toward the center,
The rear axle case 6b, which is connected to and supported by the left and right rear wheels 1b with respect to the rear portion of the body frame 2, is moved from the rear to the center side and is detachably mounted and supported, so that both the axle cases 6a and 6b support both body side frames. The front and rear portions 20 also serve as reinforcing members for firmly connecting. Further, both axle cases 6a and 6b can be easily attached to and detached from both body side frames 20 from below by mounting screws.

Further, the front axle case 6a and the rear axle case 6b are respectively mounted near the ends of the respective cases by mounting pieces 20a projecting outwardly from the both body side frames 20. As described above, the transmission case 4 is detachably connected to the transmission output shaft 41 projecting from the front surface of the transmission case 4 from the front surface of the transmission case 4 and from the traveling output shaft 41 projecting to the rear surface of the transmission case 4 via the joint 41a and the connection shaft 42. The front axle case 6a is pushed into the center of the body from the front side of the body to be removably mounted on the body frame 2, and the rear axle case 6b
Is pushed into the center of the body frame 2 from the rear side of the body, and is detachably attached to be connected to the body frame 2.

The axle cases 6a and 6b are attached to the body frame 2 so that maintenance work such as disassembly and repair of the body and cleaning and assembling work can be efficiently performed from the front and the rear without greatly lifting the body. Easy to do. Further, since the front axle case 6a and the rear axle case 6b are supported by the body side frame 20 near the ends of the cases, the moment due to the reaction force (body weight) of the front wheel 1a and the rear wheel 1b can be reduced as much as possible. It has features such as being able to provide a stable support structure while adopting a lightweight and simple configuration.

In this case, the front axle case 6a and the rear axle case 6b in the illustrated example move up and down the front wheel 1a and the rear wheel 1b at the ends of the case via a well-known dambar type longitudinal rotation support portion 60. The spraying unit 5a supports the spraying unit 5a so that it does not give a large impact to the fuselage even if the ground is uneven or inclined during running. It is designed to perform well.

As shown in FIGS. 5 and 6, the left and right vertical axis rotation support portions 60 on the front axle case 6a side are connected by the front steering cylinder 30, and the left and right vertical axis on the rear axle case 6b side. The turning support portion 60 is connected by a steering cylinder 30 on the rear side. The front and rear steering cylinders 30 and 30 are operated by a steering amount of a fully hydraulic power steering 31 provided below a steering wheel 4a to be described later. The front wheel 1a and the rear wheel 1b are connected and rotated at a desired cutting angle around the vertical axis rotation support portion 60 to expand and contract by the supply of pressure oil based on So they can do it. In addition, 61 shown in FIGS. 1 and 5 is an angle sensor which detects the cutting angle of the front wheel 1a and the rear wheel 1b.

Next, the support structure of the transmission case 4 and its transmission structure, the installation structure of the handle 3a and the like will be described. Referring to FIGS. 5 and 6, the transmission case 4 is attached to the body frame 2 by a "three-point support structure" that connects both sides of the transmission case 4 and the upper part thereof so that the transmission case 4 is stably supported. is there.

That is, the transmission case 4 has a downward U-shaped bracket frame 22 for connecting upper portions of the transmission case 4 to body side frames 20 provided on both sides of the transmission case 4.
The transmission case 4 is fixed by mounting screws on both sides of the transmission case 4 with mounting brackets 61a extending from the front axle case 6a fixed to the body side frame 20, so that the transmission case 4 is accurately positioned at an appropriate position. Can be installed. Also, the transmission case 4 can be obtained simply by loosening the three mounting screws.
Can be easily removed from the body side frame 20, so that maintenance work can be easily performed.

The transmission case 4 may be directly attached from both sides of the body frame 20. However, as shown in the illustrated example, the transmission case 4 is attached to the front axle case 6a.
The transmission case 4 is fitted and mounted between the case brackets 61, 61 extending rearward away from the main body, so that even if the machine body frame 2 has a processing distortion, a twist or the like at the time of welding or the like. Without being affected by this, it can be accurately positioned at an appropriate position, and the transmission of the wheel and the spraying device 5 as a working device can be favorably performed. Further, at this time, the transmission case 4 is fixed by suspending a point at the upper central portion thereof through the bracket frame 22, so that the transmission case 4 can be stably supported without being greatly affected by processing distortion.

Further, according to the structure for supporting the transmission case 4 configured as described above, the front axle case 6a and the transmission case 4 are arranged between the body side frames 20 in a state where the transmission case 4 is assembled in three dimensions in advance. With a simple assembling operation in which the mounting pieces 20a, 20a and the bracket frame 22 are simply fastened with mounting screws, there is an advantage that they can be efficiently and firmly mounted and supported.

At this time, as shown in FIG. 4, the main transmission shifter 45, the sub transmission shifter 45a, and the work machine transmission shifter 46
The transmission operation system such as the above can be collectively provided on the front side of the transmission case 4 so that it can be connected to various operation levers (not shown) on the control unit 3 side with a short distance and simple connection means with good operability. It is.

The working machine output shaft 47 protruding from the rear surface of the transmission case 4 is connected to the belt transmission mechanism 4 via a joint 48a and a connecting shaft 48 as shown in FIG.
9 and detachably connected thereto, and drives a feeding device 5c as a feeding pump for the sprinkled material.

On the other hand, when the engine 1c is mounted on the front horizontal frame 21 and the fuselage side frame 20 immediately above the front axle case 6a due to the above configuration, the transmission case 4 is arranged at the lower rear part of the engine 1c. be able to. Therefore, a large space can be formed behind the engine 1 c and above the transmission case 4, and the all-hydraulic power steering 31 described above is extended upward by using the bracket frame 22 in this space. It can be stably mounted on the provided mounting frame 22a in a proper driving posture. Further, since the power steering 31 of the full hydraulic type does not extend the steering shaft below the mechanical device, the lower and front sides of the power steering 31 can be easily opened, and the rear part of the engine 1c and the transmission case can be easily opened. The transmission mechanism 10 including the belt and the pulley can be easily installed under the power steering 31 between the four, and the machine body can be configured with a margin while being compactly assembled.

Accordingly, a transmission case 4 is provided at a lower rear portion of the engine 1c, and a control unit 3 is provided.
The steering wheel 3a is a fully hydraulic power steering 31, and a transmission mechanism 10 for transmitting power from the engine 1c to the transmission case 4 is arranged in a space formed below the power steering 31, so that the transmission 3 The transmission of Case 4
The overall length of the fuselage can be shortened to prevent overhang on the engine 1c side, and the sprinkling section 5a can be mounted satisfactorily without shifting the weight center of the machine forward.

Further, by providing an operation system such as a shift shifter for operating the transmission case 4 at the front of the transmission case 4, the operation systems are centralized at one place and connected to operation levers. It has advantages such as a simple and inexpensive structure. Next, with reference to FIGS. 1, 2, 5, and 6, each configuration of the seat 3 b of the control section 3 and its surroundings will be described.

First, the seat 3b is supported at the center of the body frame 2 in the width direction on an upper portion of a box frame 24 installed on the horizontal frames 23, 23a. By disposing the fuel tank 1e, the fuel tank 1e is provided on the body frame 2 so that the height above the ground can be made as high as possible. In a space formed on both sides of the seat 3b, there are provided a feeding device 5c including a feed pump or the like for feeding a sprinkle material such as a chemical solution stored in the storage tank 5b into a space on the left side thereof, and a spraying unit. The lifting cylinder 5 described below, which raises and lowers 5a by hydraulic pressure
An elevating valve 5v for s is arranged. On the other hand, in the space on the right side, a switching valve (switching cock) 51 for desirably switching and feeding the scattered material manipulated by the feeding device 5c to the scatter pipe 50 of the scatter portion 5a constituting the scatter device 5 described later. Has been arranged.

Therefore, the heavy structures are combined at the central abdomen of the fuselage so that operability and maintenance work are improved, and the weight balance between the right and left of the fuselage is adjusted by the variation of the fuel in the fuel tank 1e and the dispersion of the spray in the storage tank 5b. So that it can be improved without being greatly affected.

At this time, the feeding device 5 of the spraying device 5
c is the mounting piece 2 of the body frame 2 behind the seat 3b.
0b, and is connected to the outlet by a short delivery pipe 52, so that the sprayed product can be delivered by the negative pressure generated when the delivery device 5c (liquid delivery pump) is driven. This is ensured, and the negative pressure line resistance can be reduced.

Then, the long delivery pipe 53 provided in the delivery section of the feeding device 5c is connected to the distribution pipe 50 of the distribution section 5a by providing the switching valve 51 in the middle thereof. The sprayed material can be sprayed from the nozzle 50a of the spraying tube 50 by the static pressure of the feeding device 5c from the nozzle 50a of the spraying tube 50 without causing clogging or the like of the pipeline.

Therefore, the feeding device 5c is arranged near the storage tank 5b and connected to the storage tank 5b, and the feeding device 5c and the spraying portion 5a are connected to each other by the long delivery pipe 52, so that suction is performed. There is an advantage that the spraying operation can be performed favorably while reducing the pipeline resistance due to the negative pressure and reliably feeding the sprayed object even with the long delivery pipe 53 by the static pressure.

As shown in FIG. 2, a seat 3b of the control section 3 is provided substantially at the center of the body width, a fuel tank 1e is installed in a space formed below the seat 3b, and both sides of the seat 3b are provided. By distributing the feed device 5c and the switching valve 51 for the spatter to be sent out from the feed device 5c in the space formed in the space, the fluctuation of the center of gravity due to the fluctuation of the fuel is suppressed. There are features such as running and spraying operations can be performed smoothly.

Further, the feeding device 5c and the elevating valve 5
A handle 9 for getting on and off is set up from the body frame 2 outside the v and outside the switching valve 51, and an auxiliary step 20s is provided on the auxiliary outer frame 20f on both sides of the seat 3b, so that the operator can use Easy to get on and off.

In this embodiment, the handle 9 should stably receive and support the folding movable boom 55a of the spraying portion 5a in its retracted position as shown in FIGS. 1, 2 and 5 in the middle thereof. Is provided.

The battery 91 for the engine 1c is mounted on the left auxiliary step 20s in consideration of the weight balance. A microcomputer unit 92 for controlling the electrical control of each unit is provided below the left handle 9.

The microcomputer unit 92 and the various harnesses 93 wired to the control unit 3 are provided along the inside of the body side frame 20 on the right side of the body frame 2 formed in a rectangular shape as described above. In addition to the provision, the oil pipes 95 of the hydraulic device and the like are provided along the left auxiliary outer frame 20f so as to facilitate maintenance work without confusing piping and wiring. The hydraulic pump 96 of each hydraulic device is provided integrally with the engine 1c.

Next, the traveling work vehicle 1 constructed as described above
The means for installing the spraying device 5 at s will be described. The spraying device 5 includes a storage tank 5b, a feeding device 5c, and a switching valve 51.
Is installed as described above, and the spraying part 5a is of a known structure and is moved up and down by columns 21a (FIG. 1) erected on the left and right sides of the front horizontal frame 21 by expansion and contraction of the lifting cylinder 5s. A parallel link type lifting link 54 is provided, and the left and right lifting links 54 are connected by a fixed boom 55,
On both sides of the fixed boom 55, the movable boom 55a is configured to be switchable from a storage position indicated by a solid line in FIG. 2 to an extended operation position indicated by a dotted line.

The movable boom 55a and the fixed boom 5
5 is a spray tube 5 with a nozzle connected to the delivery tube 53.
0 along the entire length, the spreading part 5a is lowered, and the movable boom 55a is expanded and extended.
The nozzle No. 0 is directed downward so that a predetermined object can be satisfactorily sprayed. The fixed boom 55
The switching of the supply of the sprinkled material to the sprinkling tube 50 mounted on the movable boom 55a is performed by the switching valve 51 as desired.

Next, the spraying work vehicle 1 constructed as described above
A pest control operation for controlling a rice cultivation in a paddy field by storing a chemical solution as a spray in the storage tank 5b using the method described above will be described.
First, the front wheel 1a and the rear wheel 1b are advanced so as to be arranged between the rice streaks, and after the spraying section 5a is in the working posture and the machine is run while driving the feeding device 5c (pump), the spraying in the storage tank 5b is started. The product is sucked out through the delivery pipe 52, is fed to the spraying pipe 50 via the switching valve 51 and the delivery pipe 53, and is evenly sprayed from the nozzle to a plurality of rice plants to efficiently perform the control work. be able to.

At this time, the engine 1c and the storage tank 5
Since b is located immediately above the front axle case 6a and the rear axle case 6b, the overall length of the fuselage can be reduced while preventing overhang.
Further, a fuel tank 1e is provided below the seat 3b,
Since the feeding device 5c and the switching valve 51 are arranged on both sides in a well-balanced manner, it is possible to prevent the running performance from being deteriorated even when the remaining amount of the fuel and the scattered material is fluctuated, and the body is lowered. Pest control work can be performed stably and smoothly even in paddy fields that are easy to do.

At this time, in a traveling work vehicle in which the engine 1c and the control unit 3 are installed on the body frame 2 having the front wheels 1a and the rear wheels 1b, the left and right front wheels 1a are connected and supported to the front part of the body frame 2. A front axle case 6a is detachably attached to and supported from below, and a rear axle case 6b that connects and supports the left and right rear wheels 1b to the rear of the body frame 2 is detachably attached from below.

Further, the front axle case 6a is detachably attached to the body frame 2 from the front side of the body, and the rear axle case 6b is detachably attached to the body frame 2 from the rear side of the body, and connected to the body frame 2. Therefore, the spraying vehicle 1 has the body frame 2 joined to the front axle case 6a and the rear axle case 6b by a simple structure while having a predetermined ground clearance, and does not raise the machine body weight center unlike the conventional device. It is possible to perform stable running or control work.

[0042]

As described above, the traveling work vehicle according to the present invention is a traveling work vehicle in which the engine 1c and the control unit 3 are installed on the body frame 2 having the front wheels 1a and the rear wheels 1b. A front axle case 6a for connecting and supporting the left and right front wheels 1a to the front part of the frame 2 is detachably attached and supported from below, and a rear axle case 6b for connecting and supporting the left and right rear wheels 1b to the rear part of the body frame 2. It is configured to be detachably attached from below.

Accordingly, the rigidity of the body frame 20 in the width direction can be improved by the two axle cases 6a and 6b, and the moment applied to the shaft ends of the both axle cases 6a and 6b can be reduced to make the structure lightweight. . Further, disassembly and assembly of the traveling body can be easily performed.

Then, the front axle case 6a is detachably attached to the body frame 2 from the front side of the body, and the rear axle case 6b is detachably attached to the body frame 2 from the rear side of the body to support the body frame 2. Thus, the front axle case 6a and the rear axle case 6b can be moved to the front side and the rear side thereof and can be easily removed by only slightly lifting the body frame 2, so that the transmission case 4 mounted on the abdomen of the body. Etc. can be performed efficiently.

Further, a front axle case 6a and a rear axle case 6b are arranged before and after the body frame 2 in which two body side frames 20, 20 are connected by a front side frame 21 and a rear side frame 23, 23a. Because they are connected near each other, the body frame / and both axle cases 6a,
Since the attachment to the axle case 6a and the axle cases 6a and 6b are connected to the fuselage frame 2, the vehicle can run stably.

[Brief description of the drawings]

FIG. 1 is a side view of a traveling work vehicle according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view showing a configuration of a body frame of the traveling work vehicle shown in FIG. 1;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side view showing a main structure of the traveling work vehicle shown in FIG.

FIG. 6 is a plan view of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spreading work vehicle 1a Front wheel 1b Rear wheel 1c Engine 1e Fuel tank 1s Traveling work vehicle 2 Body frame 3 Operating part 3a Handle 3b Seat seat 4 Transmission case 5 Spreading device 5a Spreading part 5b Storage tank 5c Feeding device 5s Lifting cylinder 6 Structure 6a Front axle case 6b Rear axle case 9 Handle 10 Transmission mechanism 20 Body side frame 22 Bracket frame 31 Power steering 42 Connecting shaft 50 Spreading tube 51 Switching valve 52, 53 Delivery tube

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D003 AA00 AA01 AA04 AA15 BB12 CA18 CA53 CA54 CA59 DA01 DA02

Claims (3)

[Claims] 1. A traveling work vehicle in which an engine 1c and a control unit 3 are installed on a body frame 2 having a front wheel 1a and a rear wheel 1b, the left and right front wheels 1a are connected and supported to the front part of the body frame 2. Front axle case 6
and a rear axle case 6b which detachably attaches and supports the rear wheel 1b to the rear part of the body frame 2 and detachably attaches the rear axle case 6b to the rear part of the body frame 2 from below. 2. A front axle case 6a is detachably attached to the body frame 2 from the lower front side of the body, and a rear axle case 6b is detachably attached to the body frame 2 from the lower rear side of the body and connected to the body frame 2. The traveling work vehicle according to claim 1. 3. The body frame 2 includes two body side frames 20,
2. The traveling system according to claim 1, wherein the front and rear axle cases 20 and 20 are connected by a front horizontal frame 21 and a rear horizontal frame 23, and the front axle case 6a and the rear axle case 6b are connected to the lower front and rear portions of the body frame 2, respectively. Working vehicle.