JP2000177413A - Transmission structure of running working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission structure of a running working vehicle, capable of mounting a transmission mechanism and an operation system in a space formed under the power steering of a steering wheel, by bringing an engine and a transmission case into close contact with each other. SOLUTION: This running working vehicle 1 includes an engine 1c mounted ahead of a body having a front wheel 1a and a rear wheel 1b, and a steering part 3 behind the engine 1c, wherein a transmission case 4 is mounted on the rear lower part of the engine 1c, a fully hydraulic power steering 31 is used as the steering wheel 3a of the steering part 3, and a transmission mechanism 10 transmitting power from an output shaft 1n protruding behind the engine 1c to an input shaft mounted at the front of the transmission case 4 is disposed in a space formed under the power steering 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission structure of a traveling work vehicle for transmitting the power of an engine 1c to wheels and the like via a transmission case 4.

[0002]

2. Description of the Related Art Conventionally, a spraying vehicle disclosed in JP-A-10-80243 and JP-A-10-42771 has a spraying section and a storage tank for storing a sprayed material such as a chemical solution before and after a control section 3. Direction, and control the aircraft
This is done by using a round handle provided at

[0003] The steering wheel has a steering shaft suspended substantially directly below, and its shaft end is connected to the front wheel 1a or the rear wheel 1a.
In general, a structure is used in which the body is steered by being connected to the b.

[0004]

The traveling work vehicle having the above-mentioned conventional construction has a structure in which the steering shaft of the steering wheel passes vertically through the center of the body, so that the output shaft of the engine and the input of the transmission case are provided. Since the steering shaft has to be detoured by, for example, disposing the shaft to the side, the transmission structure becomes complicated and various operation levers must be installed. There is a problem in that it is difficult to approach the vehicle, and the length of the fuselage becomes longer.

[0005]

According to the present invention, there is provided a transmission structure of a traveling work vehicle for achieving the above object, wherein an engine 1c is mounted in front of an airframe having a front wheel 1a and a rear wheel 1b,
In a traveling work vehicle 1 s having a control section 3 behind the engine 1 c, a transmission case 4 is provided at a lower rear portion of the engine 1 c, and a handle 3 a of the control section 3 is a fully hydraulic power steering 31. A transmission mechanism 10 for transmitting power from an output shaft 1n protruding from a rear portion of the engine 1c to an input shaft provided at a front portion of the transmission case 4 is formed in a space formed below the steering 31.

An operation system such as a shift shifter for operating the transmission case 4 is collectively provided at the front of the transmission case 4.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the structure of a transmission structure for a traveling work vehicle according to the present invention. 1 in the drawing
Denotes a spraying work vehicle. The spraying work vehicle 1 is mounted on a body frame 2 having a front wheel 1a and a rear wheel 1b by covering an engine 1c with a bonnet 1d from the front, and various operation levers and operation switches behind the engine 1c. An operation unit (operation panel) provided with a control unit 3 including a handle 3a and a seat 3b to be described later, an output shaft 1n protruding from the rear of the engine 1c, and an input shaft 4a provided at the front of the transmission case 4. Traveling work vehicle 1 in which
and a storage tank 5b mounted on the front of the body so as to be able to ascend and descend to spray a scattered object such as a medicine, a storage tank 5b mounted on the rear part of the body and storing the scattered object, and the storage tank 5b. And a feeding device 5c for sending the scattered material from the ground, so that the scattered material can be efficiently spread over a predetermined width to the crops in the paddy field or the field by the spraying device 5 while running independently. I have to.

Hereinafter, the detailed configuration and operation of each part will be described. First, with reference to FIGS. 3 and 4, the body frame 2 and its supporting structure and wheel transmission structure will be described. The body frame 2 in the illustrated example has two body side frames 20, which are main outer frames on the left and right sides of the body, and has front and rear ends at front and rear ends thereof.
1 and the rear horizontal frames 23 and 23a, and the middle part is connected above the transmission case 4 by a downward U-shaped bracket frame 22, and the control section 3 is positioned at the horizontal frames 23 and 2a.
3a, and is formed in a rectangular rigid frame surrounding the transmission case 4 in a plan view.
Can be installed detachably. The body frame 2 is provided outside the body side frame 20 with the auxiliary outer frame 2.
Steps 0 and the like are arranged in parallel with each other so that steps and the like can be easily attached.

The body frame 2 is supported by a front axle case 6a, a rear axle case 6b and a transmission case 4 by a support structure 6 as follows.
The disassembly and mounting operations such as those described above can be easily performed, and the aircraft can be stably supported.

That is, a front axle case 6a for supporting left and right front wheels 1a is detachably attached to a front portion of the body frame 2, and a rear axle case 6b for supporting left and right rear wheels 1b is provided at a rear portion of the body frame 2. By being detachably attached and supported, both axle cases 6
The axle cases 6a and 6b can be easily attached to and detached from both the body side frames 20 from below by using mounting screws. Like that.

The front axle case 6a and the rear axle case 6b are each provided with a mounting piece 20a (FIG. 4) projecting outward from both body side frames 20.
a, 6b are attached near the ends. Then, from the front of the transmission case 4, at the transmission connection case portion 40,
Also, by adopting a structure in which the traveling output shaft 41 protruding from the rear surface of the transmission case 4 is detachably connected via a joint 41a and a connecting shaft 42,
The front axle case 6a can be detachably attached to the body frame 2 from the front side of the body, and the rear axle case 6b can be detachably attached to the body frame 2 from the rear side of the body to be connected to the body frame 2. ing.

With this configuration, maintenance work such as disassembly and repair and cleaning of the machine body and assembling work can be efficiently and easily performed from the front and rear of the machine body without greatly lifting the machine body. Further, since the front axle case 6a and the rear axle case 6b are supported by the body side frame 20 near their respective ends, 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 a light and simple structure and a stable support structure.

The front axle case 6a and the rear axle case 6b support the front wheel 1a and the rear wheel 1b at the ends of the case via a damper type longitudinal rotation support portion 60 so that they can move up and down. It is possible to perform a proper spraying operation by the spraying unit 5a without giving a large impact to the body even by the unevenness or inclination of the ground, and by always maintaining the horizontal attitude of the body in a substantially horizontal attitude. I have to.

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 rotation on the rear axle case 6b side. The dynamic support portions 60 are connected by a rear steering cylinder 30. The front and rear steering cylinders 30, 30 expand and contract by being supplied with pressurized oil based on the operation amount of a steering wheel of a fully hydraulic power steering 31 provided at the shaft end of a steering wheel 4a to be described later. The rear wheel 1b and the rear wheel 1b are connected and rotated at a cutting angle about the desired vertical axis rotation supporting portion 60 so that the steering operation of the aircraft can be performed. In addition, 61 is an angle sensor that 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. In the figure, the transmission case 4 is stably supported on the body frame 2 by adopting a “three-point support structure” that connects both sides of the transmission case 4 and the upper part thereof.

That is, the upper part of the transmission case 4 is connected to the lower U-shaped bracket frame 2 for connecting the body side frames 20 provided on both sides of the transmission case 4.
2, and the transmission case 4 is fixed to the case bracket 61 extending from the front axle case 6a fixed to the body frame 20 by mounting screws, so that both sides of the transmission case 4 are accurately fixed to an appropriate position. Can be installed. Then, simply loosening the three mounting screws moves the transmission case 4 to the body side frame 2
It can be easily removed from zero, making maintenance work easier.

Further, the transmission case 4 may be directly attached from both sides of the body side frame 20, but as shown in the illustrated example, the transmission case 4 is attached to the front axle case 6a.
The transmission case 4 is mounted so as to be fitted between the case brackets 61, 61 projecting rearward from the main body 2, so that the transmission case 4 is supported as if it were floating above the body frame 2. That is, even if the body frame 2 has a processing distortion, a twist, or the like at the time of welding or the like, it can be accurately positioned at an appropriate position without being affected by the distortion.

A wheel and a spraying device 5 as a working device
Transmission can be performed well, and at this time,
The transmission case 4 is supported in a suspended manner at a central point above the transmission case 4 via 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 support structure of the transmission case 4 configured as described above, the front axle case 6a and the transmission case 4 are fitted into the body side frame 20 in a state where the transmission case 4 is previously assembled in a three-dimensional manner. There is an advantage that the two can be efficiently and firmly attached by a simple assembling operation in which only the parts 20a, 20a and the bracket frame 22 are fastened with the attaching screws.

At this time, as shown in FIG. 4, if the transmission operation systems such as the main transmission shifter 45, the auxiliary transmission shifter 45a, and the work equipment transmission shifter 46 are provided integrally on the front side of the transmission case 4, the control unit 3 It can be connected to various operation levers (not shown) on the side with good operability by simple connecting means in a short distance.

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, which is a feeding pump for the sprinkled material.

On the other hand, with the above configuration,
When the engine 1c is mounted on the front horizontal frame 21 and the fuselage side frame 20 directly above the front axle case 6a, the transmission case 4 can be arranged at a lower rear portion of the engine 1c. A “large space” can be formed behind the engine 1 c and above the transmission case 4, and a fully hydraulic power steering 31 is placed in the “space” using the bracket frame 22. Can be stably supported on the mounting frame 22a (FIG. 5) extending in a proper position.

Further, the power steering 31 of the full hydraulic type does not extend the steering shaft downward unlike a mechanical steering device, so that the lower and front sides of the power steering 31 can be easily opened. . Therefore, the engine 1c is located below the power steering 31 between the rear of the engine 1c and the transmission case 4.
A transmission mechanism 10 composed of a belt and a pulley for transmitting power from an output shaft 1n provided at a rear portion of the transmission case 4 to an input shaft 4a of the transmission case 4 can be installed. it can.

As described above, the transmission case 4 is provided at the lower rear portion of the engine 1c,
The steering wheel 3a is constituted by an all-hydraulic power steering 31, a "space" is formed below the power steering 31, and power is transmitted from the engine 1c to the transmission case 4 using this space. Mechanism 1
By disposing 0, the transmission of the transmission case 4 from the engine 1c can be performed without shortening the overall length of the fuselage and preventing overhang on the engine 1c side, and mounting the spraying portion 5a without biasing the machine center of gravity forward. be able to.

In addition, an operation system such as a shift shifter for operating the transmission case 4 is collectively provided at a front portion of the transmission case 4, so that the operation system is concentrated at one place and the operation levers and the like are integrated. Can be made simple and inexpensive. Next, FIG.
2, 5 and 6, the seat 3b of the control unit 3 will be described.
And each configuration around it will be described.

First, the seat 3b is fixed to the upper part of a box frame 24 installed on the horizontal frames 23, 23a at the center of the body frame 2 in the width direction. By installing the fuel tank 1e, the fuel tank 1e is provided on the body frame 2 so that the height above the ground is made as high as possible.

In a space formed on both sides of the seat 3b, there is provided a feeding device 5c including a feeding pump or the like for spraying a chemical solution or the like stored in a storage tank 5b in a space on the left side thereof. And an elevating valve 5v for an elevating cylinder 5s, which will be described later, which raises and lowers the spraying unit 5a with hydraulic pressure. In the space on the right side, a switching valve (switching cock) 5 for desirably switching and feeding the scattered material manipulated by the feeding device 5c to a scatter pipe 50 of a scatter portion 5a constituting the scatter device 5 described later.
1 and place each heavy structure in the center of the fuselage,
In addition, the operability and maintenance work are improved so as to be better.
The improvement can be made without being largely affected by the fluctuation of the fuel in the tank or the spatter in the storage tank 5b.

Further, the feeding device 5c of the spraying device 5 is arranged to be close to the storage tank 5b mounted and mounted on the mounting piece 20b of the body frame 2 behind the seat 3b, and to have a short outlet. The connection by the delivery pipe 52 ensures the delivery of the sprinkled material by the suction negative pressure generated when the feeding device 5c is driven, and reduces the negative pressure pipeline resistance.

Then, the long delivery pipe 53 provided at the delivery section of the feeding device 5c is connected to the distribution pipe 50 of the distribution section 5a through the switching valve 51 in the middle thereof. In addition, the sprayed material can be sprayed from the nozzle 50a of the spraying tube 50 by the discharge pressure of the feeding device 5c 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 by the long delivery pipe 52, so that the negative pressure is maintained. There is an advantage that the spraying operation can be favorably performed even with the long delivery pipe 53 by the static pressure while reducing the pipeline resistance due to the pressure.

The seat 3b of the control section 3 is provided substantially at the center of the body width, and a fuel tank 1e is installed in a space formed below the seat 3b, and is formed on both sides of the seat 3b. Feeding device 5c
And a switching valve 5 for the scattered material delivered from the feeding device 5c.
By arranging 1 in a distributed manner, it is possible to suppress the fluctuation of the center of gravity due to the fluctuation of the fuel and to smoothly perform the traveling and the spraying operation.

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, as shown in FIGS. 1, 2 and 5, the handle 9 can stably receive and support the movable boom 55a for folding the spraying portion 5a in its retracted position as shown in FIGS. By providing the receiving device 90 that can be used, both the handle and the receiving device can be used in a simple configuration.

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 body frame 2 formed in a square shape
The microcomputer unit 92,
In addition, various harnesses 93 wired to the control unit 3 are inserted and provided, and the oil pipes 95 and the like of the hydraulic device are collectively provided along the left auxiliary outer frame 20f to confuse the piping with the wiring. Without doing so, maintenance work is facilitated (FIG. 6).

The hydraulic pump 96 of each hydraulic device is provided integrally with the engine 1c. Next, means for installing the spraying device 5 on the traveling work vehicle 1s configured as described above will be described.

The spraying device 5 includes a storage tank 5b and a feeding device 5
c and the switching valve 51 are installed as described above, and the spraying portion 5a adopts a known structure, and is extended and contracted by the elevating cylinder 5s on the columns 21a erected on the left and right sides of the front horizontal frame 21. A vertically movable parallel link type elevating link 54 is provided, and the front ends of the left and right elevating links 54 are connected by fixed booms 55. The movable boom 55a is stored on both sides of the fixed boom 55 in a storage position shown by a solid line in FIG. , The movable boom 55a and the fixed boom 55 are provided with a nozzle-equipped scatter pipe 50 connected to the delivery pipe 53 along the entire length thereof.
In the working posture, the nozzle of the spray pipe 50 is directed downward so that the predetermined spraying object can be satisfactorily sprayed. It should be noted that the switching of the supply of the scattered articles to the scatter pipes 50 mounted on the fixed boom 55 and the movable boom 55a can be performed as desired by the switching valve 51.

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 will be described. First, when the front wheel 1a and the rear wheel 1b enter the rice streak, the spraying section 5a is set to the working posture, and then the machine is run, the sparged material in the storage tank 5b is simultaneously driven by the feeding device 5c.
2, which is pressure-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, so that the controlling operation can be performed efficiently. It is.

At this time, the engine 1c and the storage tank 5
b are located immediately above the front axle case 6a and the rear axle case 6b, respectively, to prevent overhang and reduce the overall length of the body. And fuel tank 1
e is provided below the seat 3b, and the feeding device 5c and the switching valve 51 are arranged on both sides of the seat 3b in a well-balanced manner. This makes it possible to smoothly perform the work of controlling paddy fields where the aircraft is likely to sink.

In particular, in the present invention, a traveling work vehicle 1s having an engine 1c mounted in front of an airframe having a front wheel 1a and a rear wheel 1b, and having a control unit 3 installed behind the engine 1c.
, A transmission case 4 is provided at a lower rear portion of the engine 1c, and the handle 3a of the control unit 3 is a fully hydraulic power steering 31, and a space formed below the power steering 31 is provided with a space for the engine 1c. Since the transmission mechanism 10 for transmitting power from the output shaft 1n protruding at the rear to the input shaft provided at the front of the transmission case 4 is arranged to form the transmission structure of the traveling work vehicle, the engine 1c and the transmission 4 , The transmission mechanism 10 between them can be formed in a simple configuration, and the assembling and adjustment work becomes easy.

The transmission case 4 and the control unit 3 are formed at the front of the transmission case 4 by forming a transmission structure of a traveling work vehicle in which an operation system such as a shift shifter for operating the transmission case 4 is collectively provided. With various operation levers between and short distance,
In addition, since the devices can be connected in an orderly manner, a device excellent in operability and assemblability can be obtained.

[0042]

As described above, the transmission structure of the traveling work vehicle according to the present invention is a traveling work vehicle 1s in which the engine 1c and the control unit 3 are installed from the front on the body frame 2 having the front wheels 1a and the rear wheels 1b. , A transmission case 4 is provided at a lower rear portion of the engine 1c,
A steering mechanism 3a of the control section 3 is formed on a power steering 31 of a fully hydraulic type, and a transmission mechanism 10 for transmitting power from the engine 1c to the transmission case 4 is formed in a space formed below the power steering 31. Features.

Therefore, the engine 1c and the transmission case 4 are made as close as possible while forming a sufficient space below the power steering 31, and the transmission mechanism 10 is provided in this space without difficulty. Therefore, the size of the body can be reduced, and the transmission can be performed well. In addition, 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 structure of the operation system can be simplified.

[Brief description of the drawings]

FIG. 1 is a side view of a traveling work vehicle according to 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 the configuration 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 1n Engine output shaft 2 Body frame 3 Operating part 4 Transmission case 4a Input shaft 5 Spraying device 5a Spraying part 5b Storage tank 5c Feeding device 5s Elevating Cylinder 6 Support structure 6a Front axle case 6b Rear axle case 9 Handle 10 Transmission mechanism 20 Airframe side frame 22 Bracket frame 31 Power steering 42 Connecting shaft 50 Spreading tube 51 Switching valve 52, 53 Delivery tube 61a Case bracket

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shuji Tanaka 667 Iya-cho, Iza-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 F term (reference) 3D039 AA03 AA04 AB11 AC21 AC64 AC77 AD22 AD26 AD34 AD54

Claims (2)

[Claims] 1. A traveling work vehicle 1s in which an engine 1c is mounted in front of an airframe having a front wheel 1a and a rear wheel 1b, and a steering unit 3 is installed behind the engine 1c, a transmission case is provided at a lower rear portion of the engine 1c. 4 and a handle 3a of the control unit 3 is a fully hydraulic power steering 31, and a transmission case is provided in a space formed below the power steering 31 from an output shaft 1n protruding from a rear portion of the engine 1c. 4 is a transmission structure of a traveling work vehicle in which a transmission mechanism 10 for transmitting power to an input shaft provided at a front portion is disposed. 2. At the front of the transmission case 4,
The transmission structure for a traveling work vehicle according to claim 1, wherein an operation system such as a shift shifter for operating the transmission case (4) is provided collectively.