JP2004182020A - Agricultural work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that an agricultural work vehicle in a small scale field or a plastic greenhouse is required to ridge or weed to immediately before an obstacle and conventionally it has been necessary to switch the direction again and again by retreating the vehicle. <P>SOLUTION: This agricultural work vehicle is provided with right and left front wheels 1F and right and left rear wheels 1R, a driver's seat 2 and a working machine R between the front and rear wheels, and an engine E on a vehicle front part. A steering handle 3A for laterally steering a vehicle body while sitting on the driver's seat is arranged at the back of the engine E, and a pushing type handle 3B for raising and operating a vehicle body rear part while having fulcrums on the front wheels 1F is also arranged at the back of the engine E. A clutch lever 4 for disengaging and operating a steering clutch for the front wheel is provided on the pushing type handle 3B, and a battery B is arranged between handle frames. Thereby, a driver can get off the vehicle body and can raise the vehicle body rear part by a second handle member (3B) while having fulcrums on the front wheels, and can move the vehicle body. Therefore, even when a facility or an obstacle exists in a field or the field is small, it is possible to laterally steer the vehicle body easily and to improve maneuverability. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a configuration of a farm work vehicle in which an operator can operate while walking or riding, and in particular, to improve maneuverability during walking.
[0002]
[Prior art]
Conventionally, left and right front wheels 1F, 1F and left and right rear wheels are provided, a cockpit and a working machine are provided between the front and rear wheels, and an engine is provided at a front portion of a vehicle body. 2. Description of the Related Art A vehicle for agricultural work that travels by transmitting it to a vehicle is known. For example, Japanese Unexamined Patent Application Publication No. 2001-95315 discloses a so-called mid-mounted riding cultivating tractor in which a work machine is mounted below a body frame, that is, a lower abdomen of a vehicle body.
[0003]
[Patent Document 1]
JP-A-2001-95315
[Problems to be solved by the invention]
In the above-mentioned agricultural work vehicle, when working mainly in a small field or a greenhouse, when ridges are formed or weeding is performed immediately before an obstacle such as a facility such as a waterway at the end of the field, or a column in the house. However, there was the inconvenience of moving the vehicle backward and changing the direction many times.
[0005]
[Means for Solving the Problems]
In view of the above problems, the present invention has taken the following technical measures.
That is, according to the first aspect of the present invention, the vehicle includes the left and right front wheels (1F, 1F) and the left and right rear wheels (1R, 1R), the cockpit (2) and the work implement (R) between the front and rear wheels, and The agricultural work vehicle which is equipped with an engine (E) and transmits the rotational power of the engine (E) to at least the front wheels (1F, 1F) of the front and rear wheels (1F, 1F, 1R, 1R).
A first handle member (3A) is provided behind the engine (E) to steer the vehicle body left and right while sitting in a cockpit (2).
A ground contact position of the front wheels (1F, 1F) is disposed behind a center of gravity position (W) of the engine (E), and a rear portion of the vehicle body is provided in front of the engine (E) with the front wheels (1F, 1F) as fulcrums. And a second handle member (3B) is provided for operating the vehicle body left and right by floating operation.
(Operation of Claim 1)
According to the first aspect of the present invention, by pressing the second handle member (3B), the rear portion of the vehicle body is lifted with the front wheels (1F, 1F) as fulcrums, and the vehicle body is steered left and right.
[0006]
In the invention according to claim 2, the second handle member (3B) is constituted by a loop frame member or two left and right frame members in plan view, and between the left and right of the frame member, from the engine (E). The agricultural work vehicle according to claim 1, wherein a battery (B) to be charged is arranged.
[0007]
(Function of Claim 2)
According to the second aspect of the invention, the load of the battery (B) is higher than the ground contact position of the front wheels (1F, 1F), that is, the assisting force when pressing the second handle member (3B). Become.
[0008]
According to a third aspect of the present invention, the second handle member (3B) is provided with a clutch operating portion (4) for turning on and off the power transmission of the front wheels (1F, 1F) individually for right and left. The agricultural work vehicle according to claim 1 or 2 is provided.
(Function of Claim 3)
According to the third aspect of the present invention, the transmission power of the front wheels (1F, 1R) inside the turning is turned off by the clutch operating portion (4), and the vehicle body is steered left and right around the front wheels (1F) as a fulcrum. .
[0009]
According to a fourth aspect of the present invention, the rear wheels (1R, 1R) are configured to have a smaller diameter than the front wheels (1F, 1F) and are driven. 3. The agricultural work vehicle according to any one of (3) and (4).
(Function of Claim 4)
According to the fourth aspect of the present invention, the weight of the rear wheels (1R, 1R) is reduced as compared with the front wheels, and the weight of the rear portion of the vehicle body is reduced.
[0010]
【The invention's effect】
Thus, in the invention of claims 1 to 4, it is possible to get down from the vehicle body, lift the rear part of the vehicle body to the fulcrum by the second handle member (3B) with the front wheel as a fulcrum, and move the facility or the facility to the field as described above. Even in a place where there is an obstacle, that is, in a narrow space, the vehicle body can be easily steered left and right to improve operability.
[0011]
According to the second aspect of the present invention, the battery (B), which is a heavy object, is located on the second handle member (3B) side with respect to the ground position of the front wheels (1F, 1F), so that the operator can minimize the trouble. The rear portion of the vehicle body can be levitated with a small force, and the operability during the steering can be further improved.
[0012]
According to the third aspect of the present invention, the second handle member (3B) is provided with the clutch operating portion (4) for turning on and off the power of the front wheels (1F, 1F) individually for the left and right sides. The vehicle body can be steered left and right with as little force as possible.
According to the invention of claim 4, the rear wheels (1R, 1R) are reduced in weight and the power transmission mechanism is also reduced, so that the rear portion of the vehicle body is further reduced in weight, and when the second handle member (3B) is pressed, The rear part of the vehicle body can be lifted with as little force as possible to improve operability.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the agricultural work vehicle T has a front frame 11 made of a square pipe arranged in the front part of the vehicle body in the front-rear direction, and two front and rear front frames 11 are provided between the left and right front frames 11. The auxiliary frames 12a and 12b for mounting the engine are bridged, and the rear end of the front frame 11 is connected to a rear frame 14 via an intermediate frame 13 arranged in a vertical direction. Two auxiliary frames 15a and 15b for mounting the seat are bridged, and the rear ends of the rear frame 14 are connected to each other by a rear wheel support frame 16 to form a vehicle body frame.
[0014]
The front ends of the left and right front frames 11 are connected by an L-shaped battery mounting plate 17 in a side view, and a battery B charged by the engine E is mounted and fixed to an intermediate portion of the plate 17. The front handle 11 has a configuration in which the pressing handle 3B (second handle member) of the loop frame in plan view is attached.
[0015]
This allows the pressing handle 3B to be used as a bumper for protecting the front part of the vehicle body while the operator is riding, or as a narrow guide for distributing a tall crop to the left and right so as not to damage the crop. Can be.
On both left and right sides of the pressing handle 3B, a clutch operating section (hereinafter, clutch levers 4, 4) for individually engaging and disengaging clutches 5L, 5R of left and right front wheels 1F, 1F, which will be described later, and both clutches are provided. The vehicle is provided with a vehicle stop lever 18 that holds the vehicle at a turning position.
[0016]
The front frame 12a of the two engine mounting auxiliary frames 12a and 12b is formed of a square pipe similarly to the frame of the vehicle body, and a horizontal shaft 20 in the left-right direction is bridged inside the pipe. In addition to providing reinforcement between the front frames 11 and 11, both ends of the coaxial 20 protrude outward from the front frame 11, and a lifting electric cylinder 21 serving as a working machine lifting actuator is attached.
[0017]
The left and right electric cylinders 21 are provided with an electric cylinder position adjusting mechanism 6 that can adjust the right and left mounting positions. The right and left electric cylinders 21 are slid laterally on the shaft 20 so as to be fixed to the fixing holes provided in the base of the electric cylinder 21. The right and left mounting positions are adjusted by mutually fixing the pins 6 in correspondence with the fixing holes 6b on the side.
[0018]
A handle post 25 is provided behind the engine E, a rotary steering handle 3A (first handle member) is provided at an upper end of the post 25, and a clutch for the left and right front wheels 1F is provided on a side of the post 25. At the same time, the clutch lever 27 to be disengaged is supported so as to be rotatable up and down. Wires 29a, 29b for transmitting and pushing the rotation of the steering shaft 28 are provided below the handle post 25, and the left and right clutches 5L, 5R provided in the traveling system power transmission mechanism for the front wheels 1F, 1F are individually provided. It is configured to switch on and off.
[0019]
Thus, when the steering wheel 3A is turned leftward, the clutch 5L of the left front wheel 1F is disengaged, and the vehicle is steered leftward with the left front wheel 1F as a fulcrum, and when the steering wheel 3B is turned rightward, the right front wheel 1F side. Is disengaged, and the vehicle can be steered rightward with the right front wheel 1F as a fulcrum.
[0020]
A step floor 19 is supported above the rear frame 14, and the cockpit 2 is provided above the floor 19, and the rear ends of the frame 14 are located outside the width of the frames 14, 14. The left and right rear wheels 1R of a caster type are attached to the frame 16 by connecting them with a rear wheel supporting frame 16 protruded long. The rear wheel 1R is also provided with a rear wheel position adjusting mechanism 7 comprising a fixing pin 7a and a plurality of mounting holes 7b so that the left and right positions can be adjusted, similarly to the electric cylinder 21. The tread can be adjusted according to the width.
[0021]
The rear wheel 1R has a smaller diameter than the front wheel 1F and is not provided with a drive mechanism. Therefore, the rear wheel 1R has a lighter configuration. When the operator gets off the vehicle, the weight of the rear portion of the vehicle body, The ground load of the wheel 1R is configured to be extremely small.
[0022]
Accordingly, even when the operator pushes the pressing handle 3B to lift the vehicle around the front wheel 1F, the operator can operate with as small a force as possible to improve operability during steering.
Next, the power transmission mechanisms of the traveling system and the working system will be described with reference to FIGS.
[0023]
As shown in FIGS. 3 and 4, the power transmission mechanism of the traveling system sequentially rotates the output shaft 30 of the engine E through the belt mechanism 31, the transmission case 32, and the transmission mechanism in the front wheel supporting portal case 33 through the respective transmission mechanisms. The transmission is performed to drive the front wheel 1F.
[0024]
More specifically, on one side of the engine E, an engine output shaft 30 protrudes toward the outside of the vehicle body, and rotates the coaxial 30 by a driving pulley 24a and a driven pulley 24b in a belt case 31; The transmission is transmitted to a first shaft 40 serving as an input shaft of the rear transmission case 32 via a rubber belt 39 connecting the two pulleys 24a and 24b.
[0025]
The transmission case 32 is a metal case that is bent in the shape of a letter “reverse” when viewed from the side. Each of the transmission mechanisms transmits power through rotation of the chain 62.
[0026]
The upper enlarged portion of the transmission case 32 is configured to receive six gear shafts including the first shaft 40 (hereinafter, first shaft 40, second shaft 41,..., Sixth shaft 45). I have. Reduction gear sets 46 and 47 are provided between the first shaft 40 and the second shaft 41 and between the second shaft 41 and the third shaft 42, respectively, to reduce the rotation of the first shaft 40. It has a configuration. Also, one end of the third shaft 42 is protruded from the case side opposite to the side where the first shaft 40 protrudes, and is protruded as a working machine output shaft, that is, a PTO shaft. Various working machines are driven via a power transmission mechanism.
[0027]
The fourth shaft 43 is provided with a first transmission gear 50 and a two-stage gear type second transmission gear 51. Both gears 50 and 51 are pivoted by a main transmission lever 52 projecting rearward from the handle post. It is configured to slide on top. Then, the first transmission gear 50 is moved rightward to mesh with the low speed reverse gear 53 on the second shaft 41, or the gear 50 is moved leftward to engage the low speed gear 55 for forward movement on the third shaft 42. Or the second transmission gear 51 is moved to the right to engage with the reverse high-speed gear 54 on the second shaft 41, or the gear 51 is moved to the left to The gear is meshed with the forward high-speed gear 56 to select one of the two front and rear speeds.
[0028]
Between the fourth shaft 43 and the fifth shaft 44, a high-speed gear set 57 for transmitting the rotation speed at a high speed and a low-speed gear set 58 for transmitting the rotation speed at a low speed are provided. The fifth clutch 44 is driven by engaging one of the clutches by moving the transmission clutch 59.
[0029]
Thereby, the agricultural work vehicle T can obtain four forward speeds and four reverse speeds.
Further, a reduction gear set 60 is provided between the fifth shaft 44 and the sixth shaft 45 to drive the drive sprocket 61 provided on the sixth shaft 45 to rotate the chain 62. ing.
[0030]
In the enlarged portion at the lower part of the case, a driven-side sprocket 63 that meshes with the chain 62 is supported, and ball-type clutches 5L and 5R are formed on left and right sides of a shaft that supports the sprocket 63, respectively. A traveling output shaft 64 is provided on the driven shaft side of the clutches 5L and 5R so as to protrude to the outside of the front frame 11.
[0031]
As a result, the clutch levers 4, 4 provided on the pressing handle 3B are connected to the clutches 5L, 5R via wires in the same manner as the rotation operation of the steering handle 3A, and the gripping operation of the lever 4 allows The vehicle body can be steered left and right with one of the left and right front wheels 1F being driven.
[0032]
Further, the traveling output shaft 64 is formed in a hollow shape, and has a configuration in which the input shaft 71 of the front wheel supporting portal case 70 is inserted and fixed.
As shown in FIG. 4, a plurality of fixing holes 8b, 8b... Are formed at predetermined intervals in the portal case input shaft 71, and a fixing pin 8a is penetrated and fixed to one of the fixing holes 8b. , That is, a configuration in which the front wheel position adjusting mechanism 8 is provided.
[0033]
Thereby, the right and left positions of the tread of the rear wheel 1R and the working machine R can be adjusted together with the left and right positions, and the traveling work can be performed in accordance with various ridge widths at the time of work or the row width of planted crops.
Further, the portal case 33 is formed so as to be inclined rearward from the support portion of the portal case support shaft 71 downward in a side view, and axle shafts 74 that support the front wheel 1F are supported at the lower portion of the case. ing.
[0034]
Thereby, the ground contact position of the front wheel 1F can be located as much as possible behind the center of gravity W of the engine E, and the weight of the engine E assists the pressing force when the pressing handle 3A is pressed downward. Thus, the rear portion of the vehicle can be lifted with the front wheel 1F as a fulcrum with a minimum force.
[0035]
Further, since the front wheel 1F is supported inside the portal case 33 in the lateral direction of the vehicle body, the vehicle width is reduced as much as possible, for example, as compared with a configuration in which the front wheel 1F is supported outside the case 33. The vehicle can travel even between narrow ridges.
Next, the working machine power transmission mechanism will be described.
[0036]
The power transmission mechanism of the working machine system sequentially transmits the rotation output of the engine E to the belt case 31, the transmission case 32, the first rotary case 34, and the left and right second rotary cases 35, 35, The power is transmitted through each transmission mechanism in the rotary cases 36, 36, and further transmitted to the work implement R. In the illustrated example, a so-called cult rotary working machine R for weeding between ridges is mounted, and a rotary shaft 38 having a rotary claw 37 is rotated.
[0037]
More specifically, as shown in FIGS. 3 and 5, a first rotary case 34 is provided in contact with one side of the transmission case 32, and a first rotary shaft 34 serving as an upper input shaft is provided in the case 34. The shaft 80, the second shaft 82, which extends parallel to the first shaft, and the lower third shaft 90 are supported. The first shaft 80 is formed in a hollow shape and spline-fits the protruding portion of the third shaft 42 of the transmission case 32, and drives the second shaft 82 from the coaxial 80 via a constant meshing gear set 83. Configuration.
[0038]
The second shaft 82 is provided with a drive gear 85 which constantly meshes with the idle gear 84 on the first shaft 80, and the drive gear 85 is provided on the second shaft 82 with a clutch (hereinafter referred to as work on / off). The transmission power is turned on and off by sliding the clutch 86).
[0039]
The work on / off clutch 86 may be configured such that a work clutch on / off lever is provided on the handle post 25 and the slide operation is performed via a mechanical interlocking mechanism such as a wire or a rod. May be provided, and a slide operation may be performed via an electric interlocking mechanism such as an electric motor.
[0040]
Further, a driving sprocket 87 is integrally formed with the idle gear 84, and a driven sprocket 89 and a third shaft 90 at a lower portion of the case are driven via a chain 88. Further, the third shaft 90 is formed in a pipe shape, and has a configuration in which a toolbar 9 serving as a frame member for mounting a working machine described later is penetrated and fixed inside the shaft 90.
[0041]
Since the first rotary case 34 configured as described above is configured to be detachable from the third shaft 42 (PTO shaft) of the transmission case 32, the transmission mechanism in the first rotary case 34 is changed. For example, the specification can be changed at low cost by changing to a so-called reverse rotation PTO specification in which the input rotation is reversed and outputting it, or a specification having a shift stage and projecting the toolbar 9 at the same position.
[0042]
At the left and right ends of the toolbar 9, a plurality of working machine fixing holes 10b are provided in correspondence with the tread changing fixing holes 7b, 8b of the front and rear wheels 1F, 1R. And the right and left positions of the working machine R are adjusted by inserting the pins 10a through the holes.
[0043]
The cult rotary working machine R is mounted on each of the toolbars 9 symmetrically with respect to the left and right sides. The cult rotary working machine R is mounted on the second rotary case 35, the third rotary case 36, and the rotary portion 96 below the third rotary case 36. It is configured. The upper end of the second rotary case 35 is connected to the distal end of the piston of the electric cylinder 21, and the case 35 is vertically rotated about the toolbar 9 by the expansion and contraction operation of the piston (arrow A1 in FIG. 1). In addition to being freely configured, the lower part of the second rotary case 35 and the upper part of the third rotary case 36 are connected by a rotating shaft 97 also serving as a transmission shaft.
[0044]
Further, the third rotary case 36 is vertically rotated in response to the rotation of the second rotary case 35, that is, the rotary portion 96 is moved up and down in the direction of arrow A2 in FIG.
Further, the lower portion of the second rotary case 35 and the intermediate portion 36 of the third rotary case 36 are connected by a link mechanism 95, and the rotary portion 96 is connected regardless of the rotation of the upper and lower rotary cases 35, 36. It is configured to be maintained substantially parallel to the vehicle body.
[0045]
The rotary part 96 has a configuration in which the upper part and the side part are covered with a rotary cover 98, a single cultivation soil plate 100 is provided at the rear part of the cover 98, and the plowed soil is pressed against the ridge side to form a new ridge. I have.
In the agricultural work vehicle configured as described above, during normal operation, the steering wheel 1A is rotated while the driver sits on the cockpit 2 to steer the vehicle body left and right, and at the very end of facilities and obstacles in the field. When the vehicle is operated close to and steered or turned in a place where the maneuvering space is limited, the user must get off the vehicle and lift the front wheels 1F, 1F to the fulcrum using the pressing handle 3B to move the rear of the vehicle to the fulcrum. And the operability of the vehicle can be improved.
[0046]
Also, when the pressing handle 3B is pressed, the battery B, which is particularly heavy, is positioned forward of the ground contact position of the front wheels 1F and 1F and in the handle 3B, so that the operator can minimize the force. The rear portion of the vehicle body can be raised, and the operability during the steering can be further improved.
[0047]
Further, since the clutch lever 4 for turning on / off the power of the front wheels 1F and 1F is separately provided on the pressing handle 3B, it is necessary for the operator to perform left and right steering with a minimum force, that is, the operator's own power at the time of steering. And the operability of the vehicle body can be improved.
[0048]
As another form of the present invention, as shown in FIG. 2, the pressing handle 3B may be formed in a forked shape by two left and right frame members 3B ', or a power transmission mechanism of the front wheel 1F. , A differential device may be provided to steer the front wheels 1F left and right.
[Brief description of the drawings]
FIG. 1 is a side view of an agricultural work vehicle.
FIG. 2 is a plan view showing the arrangement of a body frame and various transmission cases of the agricultural work vehicle.
FIG. 3 is a diagram showing a power transmission mechanism.
FIG. 4 is a diagram showing a power transmission mechanism of a traveling system.
FIG. 5 is a diagram showing a power transmission mechanism of a working system.
[Explanation of symbols]
B Battery E Engine R Work implement T Farm work vehicle W Center of gravity of engine 1F Front wheel 1R Rear wheel 2 Cockpit 3A First handle member (steering handle)
3B Second handle member (handle for pressing)
Reference Signs List 4 clutch lever 5L left front wheel clutch 5R right front wheel clutch 6 cylinder position adjustment mechanism 7 rear wheel position adjustment mechanism 8 front wheel position adjustment mechanism 9 work implement mounting toolbar 10 work implement position adjustment mechanism

Claims (4)

The vehicle has left and right front wheels (1F, 1F) and left and right rear wheels (1R, 1R), a cockpit (2) and a working machine (R) between the front and rear wheels, and an engine (E) at a front portion of a vehicle body. An agricultural work vehicle that travels by transmitting the rotational power of the engine (E) to at least the front wheels (1F, 1F) among the front and rear wheels (1F, 1F, 1R, 1R).
A first handle member (3A) is provided behind the engine (E) to steer the vehicle body left and right while sitting in a cockpit (2).
A ground contact position of the front wheels (1F, 1F) is disposed behind a center of gravity position (W) of the engine (E), and a rear portion of the vehicle body is provided in front of the engine (E) with the front wheels (1F, 1F) as fulcrums. An agricultural work vehicle provided with a second handle member (3B) for performing a floating operation on the vehicle and steering the vehicle body left and right. The second handle member (3B) is formed of a loop frame member or two left and right frame members in plan view, and a battery (B) charged from the engine (E) is provided between the left and right frame members. The agricultural work vehicle according to claim 1, wherein the agricultural work vehicle is arranged. The said 2nd handle member (3B) was provided with the clutch operation part (4) which performs on-off operation of power transmission of the said front wheel (1F, 1F) right and left individually. The described agricultural work vehicle. The agricultural work according to any one of claims 1 to 3, wherein the rear wheel (1R, 1R) is configured to have a smaller diameter than the front wheel (1F, 1F) and is configured to be driven. car.

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