JP4321141B2 - Farm work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a farm vehicle provided with a working machine that moves up and down independently on the left and right sides of a vehicle body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, farm work vehicles are provided with work machines that can be raised and lowered freely between the rear and front parts of a vehicle body or between front and rear wheels, and these work machines are configured to be raised and lowered by operating switches and levers. For example, in Japanese Patent Laid-Open No. 8-149901, a spiral rotor is provided between front and rear wheels, and a screw elevator provided at the center of the left and right of the vehicle body is rotated to move the spiral rotor up and down.
[0003]
[Patent Document 1]
JP-A-8-149901 (paragraph [0008], FIG. 3)
[0004]
[Problems to be solved by the invention]
However, since the lifting device of the working machine lifts and lowers the entire body with a single lifting operation tool (screw elevator) with respect to the vehicle body, unworked land remains only on one side of the vehicle body, such as dredging work. In some cases, it was not possible to carry out the work of molding the ridges outside the vehicle body. In addition, if the work machine is divided into left and right parts so that it can be moved up and down independently on the side of the vehicle body, the position of the operation unit and the position of the work machine are difficult to see, and the state of the work machine is confirmed. However, it was forced to take a cramped posture to move up and down, and there was a problem that the operability was poor.
[0005]
Therefore, the present invention is intended to improve the operability of the left and right work machines provided in the agricultural work vehicle.
[0006]
[Means for Solving the Problems]
In view of the above-described problems, the present invention is configured as follows.
That is, according to the first aspect of the present invention, the left and right front wheels (11F, 11F), the left and right rear wheels (11R, 11R), and the left and right working machines (3 , 3 ) between the left and right front wheels. The left and right working machines (3 , 3 ) are provided so that they can be moved up and down independently of the left and right sides of the vehicle body, and the left and right working machines (3 , 3) the provided left and right operating device for vertically operating individually (4,4) to the steering wheel (1) near the vehicle, the left and right operating member (4,4) is working Re each Re said lateral husband The ascending and descending commands of the machine (3, 3) are output respectively, and the left and right work tools (3, 3) are individually moved up and down by operating the left and right operation tools (4, 4). Or by operating either one of the operating tools (4, 4) The farm vehicle is provided with a changeover switch (51) for selecting whether to perform the descending operation .
[ 0007 ]
According to a second aspect of the present invention, the work implement (3, 3) is provided so that it can be raised and lowered independently from each other via the upper and lower rotary cases (5, 6) with respect to the vehicle body. The display device (7) indicating the height of the working machine (3, 3) is provided in a refracting portion which is a movable part of the upper and lower rotary cases (5, 6) which operate together. The described agricultural work vehicle.
[0008]
[0009]
[0010]
[0011]
[0012]
[0013]
【The invention's effect】
Thus, according to the first aspect of the present invention, when weeding the ridge groove, when only one remaining line is left or when forming a ridge at the end of the field, the handle (1) is moved along these lines and ridges. If there is an obstacle or the like, it is possible to avoid by moving the right and left working machines (3) up and down as appropriate.
[0014]
[0015]
In addition, since it is possible to switch between the case where the work implement (3) is raised and lowered independently and the case where it is raised and lowered at the same time, for example, when turning at the field end, both the left and right work can be performed simultaneously with one operating tool (4). Since the machine (3, 3) can be moved up and down, the operability of the operation tool (4) is good.
[0016]
The invention of claim 2, it is possible to check the working machine height (3) At the same time, the confirmation work is facilitated when the working machine lifting operation, also configured to include the like to the handle near the separate monitor comparison Thus, the display device can be configured at low cost.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 4, the farm vehicle 10 includes left and right front wheels 11F and 11F at the front part of the vehicle body as a whole, and left and right rear wheels 11R and 11R at the rear part of the vehicle body, and between these front and rear wheels 11F and 11R. The work machines 3 and 3 are provided on the left and right sides of the left and right virtual center line L1 of the vehicle body.
[0018]
Further, on the virtual center line L1 on the left and right sides of the vehicle body, a pressing handle 12, an engine E, a steering handle 1 serving as a steering wheel according to the present invention, and a cockpit 2 are provided in order from the front. The steering wheel 12 is pressed to move the rear part of the vehicle body with the front wheel 11F as a fulcrum, and the steering wheel 1 is rotated from the cockpit 2 to steer the rear wheel 11R left and right. In this configuration, the vehicle body is steered from side to side.
[0019]
More specifically, the agricultural vehicle 10 is provided with front frames 15a arranged in the front-rear direction on the left and right sides of the front part, and a rear frame 15c is connected to the rear part of the frame 15a via an intermediate frame 15b in the vertical direction. A vehicle body frame 15 is constructed by bridging a plurality of connecting plates or connecting frames between the left and right frames.
[0020]
The front frame 15a has front ends connected to each other by a battery support plate 15d, a battery 16 is mounted on the plate 15d, and a pressing handle 12 having a loop shape in a plan view is supported on both the left and right sides. It has become.
Further, a main clutch lever 14 is provided on the right side of the grip as viewed from the cockpit 2 of the pressing handle 12, and the transmission power from the rotational power of the engine E to the front wheels 11F is turned on and off. In this state, the left and right clutch levers 17L and 17R provided on the left and right of the grip portion of the handle 12 are configured to individually turn on and off the transmission power to the front wheels 11F and 11F serving as driving wheels.
[0021]
Thus, the operator presses the pressing handle 12, raises the rear part with the front wheel 11F as a fulcrum, and moves the vehicle forward by turning the driving force of the front wheel 11F on and off independently. You can steer left and right.
Further, the rotational power of the engine E is taken out by the tool bar 40 at the lower end portion through the transmission mechanism in the transmission case 18, and the work machine 3 is connected through the chain transmission mechanism in the upper and lower chain cases 5 and 6 described later. It is the structure which drives.
[0022]
Further, the front frame 15a has a connecting frame 15e bridged over the front part, and the engine E is mounted on the frame 15e, and a side view bent between the left and right of the rear part of the frame 15a. The transmission case 18 is arranged. Further, a base portion of a working machine lifting / lowering electric cylinder 19 is rotatably supported on the outer surface of each of the left and right front frames 15e via bracket members. By the ON / OFF operation, the piston 19a is expanded and contracted to raise and lower the working machines 3 and 3. A front wheel support bracket 20 extending toward the rear of the vehicle body is connected to the lower portion of the bracket. A portal case 21 for supporting the front wheel 11F is attached to the rear portion of the bracket 20, and the pressing handle 12 is attached to the lower portion of the bracket. It is configured to support the caster wheel 22 that maintains the forward leaning posture of the vehicle body when the vehicle body is lifted with the front wheel 11F as a fulcrum by pressing.
[0023]
Further, a handle post 23 is provided on the left and right side surfaces of the transmission case 18, and the steering handle 1 is rotatably supported on the post 23.
Further, a connecting plate 15f is bridged between the left and right frames at the rear portion of the rear frame 15c, and a seat support frame 24 for supporting the cockpit 2 is attached in the vicinity of the plate 15f.
[0024]
The rear end of the rear frame 15c is located below the seat surface 2a of the cockpit 2, and the rear ends are connected to each other by a rear wheel support rod 25 projecting left and right of the vehicle body. The rear wheel 11 is supported at the left and right ends so as to be rotatable left and right about the upper and lower support shafts 26.
[0025]
Here, the rear wheel steering mechanism A of the agricultural work vehicle 10 will be described with reference to FIGS. 5 and 6.
The rear wheel steering mechanism A includes a small-diameter gear 31 provided on the support shaft 30 of the steering handle 1, a large-diameter gear 32 that meshes with the gear 31, and a deceleration that supports the large-diameter gear 32. The rear wheel steering arm 34 rotates integrally with the shaft 33 and the coaxial shaft 33.
[0026]
Further, at the rear of the vehicle body, a steering shaft 35 is erected at the same position of the upper and lower support shafts 26 of the rear wheel 11R below the cockpit 2 and on the vehicle body left-right center line L1 in a side view. Further, the rear wheel steering plate 36 is supported. Further, the front left and right of the plate 35 are connected to the left and right ends of the rear wheel steering arm 34 via push-pull wires 37, 37, and the knuckle arm of the rear wheel 11 is connected to the rear left and right of the plate 35 via tie rods 38, 38. 39 is connected.
[0027]
Reference numeral S in the figure denotes a neutral return spring for returning the rear wheel steering plate 36 to the neutral position, that is, for returning the rear wheel 11 and the steering handle 1 to the straight position.
Thereby, when the steering handle 1 is rotated, this operation is transmitted to the steering support shaft 30, the small diameter gear 31, the large diameter gear 32, and the rear wheel steering arm 34, and further via the push-pull wires 37, 37. The rear wheel 11R is transmitted to the rear wheel steering plate 36 to steer the rear wheel 11R to the opposite side to the rotation direction of the handle 1.
[0028]
The tie rods 38 and 38 are divided into a pipe member and a support member inserted therethrough together with the rear wheel support rod 25, and the left and right rear wheels are adjusted by adjusting the protruding amounts of the rods 38 and 25 of both types. 11R tread is adjusted.
[0029]
Next, the working machine lifting device B of the agricultural work vehicle 10 and the operation unit will be described.
As shown in FIGS. 3 and 4, the working machine lifting device B of the agricultural work vehicle 10 includes a tool bar 40 protruding from the lower left and right sides of the mission case 18 and two rotary cases (upper rotary case 5, lower rotary case 6). ) And an internal chain transmission mechanism, and a working machine lifting / lowering electric cylinder 19 or the like serving as the working machine lifting / lowering actuator.
[0030]
The upper rotary case 5 is provided with an input cylinder shaft 5a through which the tool bar 40 is inserted, and an output shaft 5b projecting from the lower portion. Further, the lower rotary case 6 is provided with an input cylinder shaft 6a for fitting and supporting the output shaft 5b at the upper portion, and the tilling shaft 6b serving as an output shaft is provided at the lower portion so as to project from the left and right.
[0031]
Furthermore, a piston tip of the electric cylinder 19 is connected to the upper part of the upper rotary case 5, and a link plate 43 connected to the rear frame 15c is connected to an intermediate part of the lower rotary case 6. The upper rotary case 5, the lower rotary case 6, the link plate 43, and the bracket 44 that supports the toolbar 40 constitute a parallel link mechanism R.
[0032]
Further, when the working machine 3 is lifted up on the left and right sides of the floor 45 of the agricultural work vehicle 10 and the working machine 3 is lifted, the upper rotary case 5 and the lower rotary case 6 are placed in the bulged part 45a. The upper part is stored.
As a result, the work implement 3 can be raised higher on the side of the vehicle body and below the floor, and mud adhering to the chain cases 5 and 6 can be prevented from splashing and scattering to the operator side.
[0033]
Moreover, the raising / lowering switch 4 used as the operation tool of the said working machine raising / lowering apparatus B becomes a structure provided in the vicinity of the steering handle 1, as shown in FIG. 1 and FIG.
The steering handle 1 is provided with a switch mounting plate 50 at the center of rotation so as to be rotatable integrally with the handle 1, and is a seesaw type on the left-right virtual center line L1 of the vehicle body. The lift switches 4 and 4 are attached. The wires of the switches 4 and 4 are routed through the support shaft 30 of the steering handle 1 and connected to a switch circuit that connects the battery 16 and the electric cylinder 19.
[0034]
Further, on the upper surface of the handle post 23, the operation symmetry of the left and right work machines 3, 3 is switched to a position inside the ring portion 1a of the handle 1 and facing the handle spoke 1b and the switch mounting plate 50. An “independent / simultaneous” changeover switch 51 is provided, and the left and right lifting switches 4, 4 are used to individually move the left and right working machines 3 up or down, or one of the lifting switches 4 (4). Is configured to select whether or not the two working machines 3 and 3 are simultaneously lifted / lowered.
[0035]
In the work implement lifting apparatus B configured as described above, when the “independent / simultaneous” switch 51 is switched to the “independent” position and the upper side of the right lift switch 4 is pushed in, the electric cylinder 19 When the piston is shortened and the working machine 3 on the right side of the vehicle body is raised and the lower side of the right raising / lowering switch 4 is pushed in, the piston of the electric cylinder 19 is extended to lower the working machine 3 on the right side of the vehicle body. it can. When the upper side of the left lift switch 4 is pushed in, the piston of the electric cylinder 19 is shortened to raise the work implement 3 on the left side of the vehicle body. When the lower side of the left lift switch 4 is pushed in, the electric cylinder 19 is pushed. As a result, the working machine 3 on the left side of the vehicle body can be lowered.
[0036]
Further, when the “independent / simultaneous” changeover switch 51 is set to the “simultaneous” position and the upper side of either one of the left and right lifting switches 4 is pushed in, the work implements 3 on both the left and right sides are raised simultaneously, When the lower side of the lift switch 4 is pushed in, the work machines 3 on both the left and right sides can be lowered simultaneously.
[0037]
Thereby, in the agricultural work vehicle 10, the “independent / simultaneous” changeover switch 51 is normally set to the “simultaneous” position, and the left and right working machines 3 and 3 are simultaneously moved up and down to perform the work. For example, when only one item is left at the end, or when an outside dredging operation is performed on the vehicle body, the “independent / simultaneous” changeover switch is set to the “independent” position, and the working machine 3 on one side only is set. It is possible to work by lifting and lowering.
[0038]
The up / down switch 4 is arranged on the left and right sides of the steering ring 1a across the virtual left and right virtual center line L1, so that the operator can operate the switch even during the steering operation. The lifting / lowering operation of the work machine 3 can be performed and operability is good. Further, the lifting / lowering state of the work implement 3 can be confirmed in the same direction while pressing one switch 4. For example, the work implement 3 can be lifted and lowered with an easy posture as compared with the case where the switches are centrally arranged on the left and right. Can be operated.
[0039]
Next, the height display device 6 of the work implement 3 and the stopper mechanism C of the work implement lifting device B will be described.
The left and right upper and lower rotary cases 5 and 6 form the parallel link mechanism R and move the work implement 3 up and down as described above, but they become movable parts as shown in FIG. The display device 7 for displaying the height of the work implement 3 is provided at a position that is refracted by the upper and lower rotary cases 5 and 6 and is visible from the cockpit 2.
[0040]
Specifically, the upper rotary case 5 is marked with a triangular arrow 7b, the lower case 6 is marked with the scale 7a, and the arrow 7b moves along the scale 7a when the working machine 3 is lifted and lowered. Thus, the height of the work machine 3 is displayed.
[0041]
The notation corresponding to the arrow 7a may be another mark or a protruding piece having a small window, and the notation corresponding to the scale 7b may be a number or the like. It is good also as a symbol which shows the volume of. Moreover, it is good also as a structure which describes these on a label and affixes on the said case.
As a result, the display device is set to a position that is always visible from the cockpit 2 regardless of the lift position of the work implement 3, and always confirms the state of the link mechanism R and the height of the work implement 3 at the same time. Therefore, the confirmation work at the time of raising and lowering the work implement is facilitated, and the display device can be configured at a lower cost compared to a configuration in which a monitor or the like is separately provided near the handle.
[0042]
Further, as shown in FIGS. 7 and 8, the elevation height of the work machine 3 is limited by the restriction position of the stopper mechanism C.
The stopper mechanism C is provided on the outer surface of the upper rotary case 5, and can adjust the length of the rotary adjustment knob 8 a and the knob 8 a, and the lower end can be connected to the link plate 43. And a guide tube 8c attached to the side surface of the upper rotary case 5 by inserting and supporting the rod portion 8b. Further, the lower end portion of the rod portion 8b is provided with an enlarged portion 8d having the same diameter as that of the guide tube 8c.
[0043]
As a result, when the work implement 3 is raised, the rod portion 8b moves upward, and the enlarged portion 8d at the lower end and the guide tube 8c come into contact with each other to restrict the rise of the work implement 3 (FIG. 7). When the work implement 3 is lowered, the rod portion 8c moves downward, and the lower end portion of the knob portion 8a and the guide tube 8c come into contact with each other to restrict the descent of the work implement 3 (FIG. 8).
[0044]
Thereby, the lowered position (working position) of the working machine 3 is adjusted by changing the mounting length of the rod part 8b with respect to the knob part 8a according to the height of work and the vertical width of the working machine 3. be able to. Further, as described above, the stopper mechanism C is provided on the side surface of the work machine 3 and can be adjusted from the cockpit 2, so that the operability is good.
[0045]
Next, the fertilizer applicator attached to the agricultural work vehicle 10 will be described.
A farm work vehicle 10 shown in FIG. 9 shows an example in which fertilizer hoppers 52 are mounted on the left and right sides of the vehicle body, and is configured to spread fertilizer and the like in front of the tillage portion of the cultivator work machine 3.
[0046]
Specifically, a hopper mounting bracket 53 is erected on the front frame 15 a, and the spraying hopper 52 is detachably mounted on the bracket 53. Further, the hopper 52 is provided on both the left and right sides of the handle post 23 and above the grounding position of the front wheel 11F, and the discharge port is placed in front of the tillage part along the rear side of the front wheel 11R. It is configured to open.
[0047]
Thereby, since the weight is applied to the front wheel 11F side and acts as an auxiliary force when the pressing handle 12 is operated, the hopper 52 can reduce the operation force during the walking operation of the farm vehicle 10. In addition, since the hopper 52 is mounted on the left and right sides of the vehicle body, the remaining amount can be always confirmed while the operation is continued, so that the workability is good.
[0048]
In the figure, reference numeral 54 denotes an electric motor for feeding fertilizer in the hopper. In this example, the lifting switches 4 and 4 of the work machine 3 are provided on the left and right sides of the rear surface of the handle post 23, respectively.
[Brief description of the drawings]
FIG. 1 is a front view of a steering handle.
FIG. 2 is a side view of a steering handle.
FIG. 3 is a plan view showing a working height display device.
FIG. 4 is an overall side view of an agricultural work vehicle.
FIG. 5 is a plan view showing a rear wheel steering mechanism.
FIG. 6 is a rear view showing a rear wheel steering mechanism.
FIG. 7 is a side view showing a stopper at the time of rising restriction.
FIG. 8 is a side view showing a stopper when lowering is restricted.
FIG. 9A is a plan view of a farm vehicle equipped with a fertilizer hopper.
(B) The side view of the agricultural working vehicle provided with the fertilizer hopper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steering handle 2 Pilot seat 3 Working machine 4 Lift switch 6 Working machine height display device 6a Scale notation 6b Arrow notation 10 Agricultural work vehicle

Claims (2)

Left and right front wheels (11F, 11F) and left and right rear wheels (11R, 11R) and, in the left-right each Re each Re of the working machine (3, 3) and agricultural vehicles with a between front and rear wheels of the right and left, the right and left The respective working machines (3 , 3 ) are provided so that they can be moved up and down independently of the left and right sides of the vehicle body, and the left and right working machines (3, 3) are individually moved up and down. Left and right operation tools (4, 4) are provided in the vicinity of the steering handle (1) of the vehicle , and the left and right operation tools (4, 4) are commands for raising the left and right work machines (3, 3). And a lowering command are output respectively,
By operating the left and right operation tools (4, 4), the left and right work machines (3, 3) are individually moved up and down, or one of the operation tools (4, 4) is operated. Thus, there is provided a changeover switch (51) for selecting whether or not both work machines (3, 3) are operated to be lifted / lowered simultaneously . Upper and lower rotary cases that are provided with work machines (3, 3) that can be moved up and down independently from each other via upper and lower rotary cases (5, 6) with respect to the vehicle body, and that operate as the work machines are raised and lowered. The agricultural work vehicle according to claim 1, wherein a display device (7) indicating the height of the work machine (3, 3) is provided in the refracting portion which is a movable part of (5, 6) .

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