JP2005046062A - Agricultural working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agricultural working vehicle solving the problem that, since a conventional mid-mount type agricultural working vehicle equipped with an operation handle in walking so as to operate the agricultural working vehicle in walking collects various apparatuses at the end part of the vehicle to reduce operation power in walking, a longitudinal weight balance during operation is deviated and the agricultural working vehicle has difficulty in uniform operation and stable traveling especially in a muddy land. <P>SOLUTION: This agricultural working vehicle has constitution that, in its layout, an engine 14 is mounted above right and left front wheels 2 and an operating seat 4 is arranged above the right and left rear wheels 3 on the side view. The agricultural working vehicle is equipped with an operation handle 5 in walking at the front part of a body frame 1 and an operation handle 6 in riding ahead the operating seat 4 in a laid state of the engine in front and in rear. The operation handle 5 in walking is equipped with a side clutch lever 9 for engaging and disengaging traveling power of the front wheels 2 to be driving wheels. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a configuration of a farm vehicle that can be operated while riding and operating a handle, and that can operate a vehicle while walking by operating an operation handle at the front of the vehicle.

  2. Description of the Related Art Conventionally, as a riding type simple farm vehicle, a so-called mid-mount farm vehicle in which a rotary cultivator, a mower and the like are mounted so as to be movable up and down between front and rear wheels in a side view of the vehicle body is known.

In addition, this type of farm work vehicle is equipped with a handle for operation during walking at one end of the vehicle body so that it can be steered well in a narrow field such as in a mountainous area or in a house, and the operator's own power with the driving wheel as a fulcrum. In addition, there is also known one that raises one end of the vehicle body to move the vehicle forward or backward or steer it.
Japanese Patent Laid-Open No. 9-201105 JP 2002-264850 A

  However, as described above, in a configuration in which the operator lifts and operates the front and rear ends of the farm vehicle by his / her own force, a configuration in which the operator can operate with as little force as possible is desirable, but various devices are concentrated on the drive wheel side serving as the fulcrum. If placed, the front / rear weight balance of the vehicle will be biased even during work, and the drive wheel with high ground pressure will sink into the mud, or the driven wheel with low ground pressure will float on uneven parts and slopes, making the vehicle precise. There was a problem that it could not be operated.

  In addition, if the front / rear weight balance of the vehicle is biased, the working section may also be inclined to obstruct uniform work or stable work.

  The present invention takes the following technical means in order to solve the above-described problems.

First, in the invention of claim 1, body frames 1, 1 disposed in the front-rear direction are provided on the left and right sides of the vehicle,
A pair of left and right front wheels 2, 2 serving as driving wheels is provided at the front of the frame 1, 1,
A pair of left and right rear wheels 3, 3 are provided at the rear of the frames 1, 1 as steering wheels.
In a side view of the vehicle, a cockpit 4 is provided above the left and right rear wheels 3, 3, and an engine 14 is provided above the left and right front wheels 1, 1.
With the engine 14 interposed in the front-rear direction, a walking operation handle 5 is provided at the front of the vehicle body frame 1, and a riding operation handle 6 is provided in front of the cockpit 4.
A farm vehicle equipped with a working machine 7 between the front and rear wheels 2, 2, 3, 3 can be moved up and down.

  In the agricultural vehicle according to the present invention, the user performs the riding work by sitting on the cockpit 4 and grasping the operation handle 6 at the time of boarding, and gets off the vehicle body and grasps the operation handle 5 at the time of walking at the front of the vehicle body while walking. Steer.

  Further, according to the present invention of claim 2, the on-board operation handle 6 in front of the cockpit 4 is connected to the rear wheels 3 and 3 serving as steering wheels so as to be able to be steered so that the front body frame 1 can be operated on foot. 2. The agricultural work vehicle according to claim 1, wherein the handle 5 is provided with side clutch operating portions 9 and 9 for intermittently operating the driving power of the front wheels 2 and 2 serving as driving wheels.

  In the agricultural vehicle according to the present invention, the steering operation at the time of boarding and the steering operation at the time of walking can be freely performed. While holding the handle 5 and operating the side clutch, it is possible to perform a small turn or a small steering operation by turning on the spot.

  Next, according to a third aspect of the present invention, the transmission 11 provided in the traveling transmission mechanism 10 extending from the engine 14 to the front wheels 3 and 3 extends to a position in the vicinity of the operation handle 6 when riding in front of the cockpit 4. The shift operation lever 12R for riding and the shift lever 12F for walking operation extended to the vicinity of the walking operation handle 5 at the front part of the body frame 1 are provided so that the shift operation can be performed from the riding position and the walking position, respectively. A farm work vehicle according to claim 1 constituted.

  In the agricultural work vehicle according to the present invention, the speed change operation is performed by freely selecting the traveling speed from both the boarding position in which the driver sits in the cockpit 4 and the walking work position holding the operation handle 5 during walking. be able to.

  Thus, according to the first aspect of the present invention, in comparison with the configuration in which the engine and the cockpit, that is, the weight of the operator is concentrated on the drive wheel side as described above, the weight of the operator The weight of the rear wheel is approximately equal to the left and right front and rear wheels 2 and 3, and the weight of the rear wheel is reduced by the weight of the operator during walking operation. Can be lifted.

  According to the second aspect of the present invention, the vehicle body is steered by the operating handle 6 when riding, and the side clutch is intermittently operated by operating the operating portion provided on the operating handle 6 when walking. Therefore, when you reach the edge or corner of the field, you can get off the vehicle, grasp the handle 6 when walking, and turn the side clutch while turning the side clutch. Detailed maneuvering is possible.

  According to the third aspect of the present invention, it is possible to select a traveling speed and freely perform a speed change and switching operation from either the boarding position where the operator sits in the cockpit 4 or the walking work position where the operation handle 5 is held during walking. It has a practical effect that can be performed.

  The present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 4, the body frame 1 of the farm vehicle is arranged in the front-rear direction with a space between the left and right sides, and a plurality of horizontal frames 1 b, 1 b are crossed in the horizontal direction and integrated. It is structured to be linked to the framework. The body frame 1 supports a pair of left and right front wheels 2 and 2 serving as driving wheels at the front portion via brackets 20 and 20, and a pair of left and right rear wheels 3 and 3 serving as steering wheels as shafts at the rear portion. It is constructed so that it can run on a rack.

  A support base is provided at the foremost part of the vehicle body frame 1 and a battery 13 is mounted. A loop-like operation handle 5 for walking at the base is fixed to the right and left sides immediately behind the body frame. 14 and a transmission case 15 on the rear side. The cockpit 4 has a structure in which a seat support 16 is provided on the rear upper side of the vehicle body frame 1 on which the rear wheels 3 and 3 are pivoted, and is attached to and supported by the seat support 16.

  The front wheels 2 and 2 are pivotally provided at lower ends of front portal portal axles 17 and 17 disposed on both the left and right sides, and extend laterally and horizontally on the lower side of the body frame 1. The portal axles 17 and 17 are attached to and supported by hexagonal shafts 19 and 19 inserted into the provided hexagonal tube 18 from both the left and right sides through axle brackets 20 and 20. In this case, the left and right hexagon shafts 19, 19 are slidably inserted into the hexagon tube 18 having the positioning pin holes 21 from both the left and right sides, and the locking pins (not shown) are detachably tightened to enable tread adjustment. It is composed.

  The hexagonal tube 18 is configured by providing a push bolt 22 for killing the outer side of the positioning pin hole 21. The positioning pin hole 21 is provided at a position that maintains an angle of approximately 90 degrees with respect to the extending direction of the axle brackets 20 and 20 so that the strength can be ensured.

  As shown in FIGS. 2 and 4, the front wheels 2 and 2 are slidable in the axial direction to transmit the traveling power between the transmission case 15 and the upper portions of the portal cases 17 and 17. Are connected to each other, and driving power is transmitted via a driving power transmission mechanism 10 to be described later.

  Next, a description will be given of the operation handle for riding (hereinafter referred to as the steering handle 6).

  As shown in FIG. 2, the steering handle 6 is disposed upright in front of the cockpit 4 and behind the engine 14, and is connected to rear wheels 3 and 3 that are non-driven and serve as steering wheels via wires. It is said. In this case, since the steering interlocking mechanism uses a conventionally known configuration, only the outline of the configuration will be described.

  First, as shown in FIGS. 1 and 2, the steering force of the steering shaft 24 is transmitted from the left and right push-pull wires to the rear left and right tie rods 25 and 25 via the speed reduction mechanism. Are transmitted to the rear wheels 3 and 3 via the knuckle arms 26 and 26 and are steered.

  Next, as shown in FIG. 3, the traveling power transmission mechanism 10 receives the rotational power of the engine 14 from the belt transmission mechanism 27 and is input to the main transmission 11, and further the power transmitted through the auxiliary transmission 28. It is configured to be transmitted from the intermediate shaft 29 to the center gear 31 of the side clutch shaft 30. The pair of left and right front wheels 2 and 2 are connected to the front wheel input shaft 23 (see FIG. 4) via a side clutch 32 and a side brake 33 provided on the side clutch shaft 30 on both the left and right sides of the center gear 31. And the power is transmitted through the portal cases 17 and 17 as traveling power.

  Then, as shown in FIG. 3, the main transmission 11 has large, medium, and small gears that are alternately meshed with the three transmission gears 35, 36, and 37 that are mounted on the transmission shaft 34 on the upper transmission side. The three transmission gears 38, 39, and 40 are mounted on the transmission shaft 41 so as to be freely slidable in the axial direction so that a three-stage transmission can be performed.

  The sub-transmission 28 is disposed between the transmission shaft 41 of the main transmission 11 and the intermediate shaft 29 on the lower transmission side, and is configured to be capable of two-stage shifting at high speed and low speed. Therefore, the traveling transmission mechanism 10 is configured to be capable of six-stage shifting by combining three-stage shifting by the main transmission 11 and two-stage shifting by the auxiliary transmission 28.

  The power take-off shaft 42 is configured to take out the power branched from the transmission shaft 34 and transmit it to the work machine drive shaft 43 that is pivoted on the lower transmission side, and is provided with a clutch 44 in the middle.

  The main transmission 11 has a shifter for operating the three transmission gears 38, 39, 40 provided on the transmission shaft 41 so as to be freely slidable in the axial direction by means of a bifurcated transmission lever 12F, 12R. It is connected so that it can be operated, and can be operated freely from either the front or rear lever. As shown in FIG. 2, the front shift lever 12F extends to a position near the walking operation handle 5 provided at the front portion of the vehicle body frame 1 and holds the walking operation handle 5. The shift operation can be performed from the position of the operator. The rear shift lever 12R is provided so as to extend to a position below the steering handle 6 so that a shift operation can be performed from a riding position sitting on the cockpit 4.

  The walking operation handle 5 protrudes forward from the handle 5, and comes into contact with the operator's body. The emergency stop lever 5a operates to disengage the main clutch and the side clutch 32 of the left and right front wheels 2, 2. , 32 are supported and supported by side clutch operating portions 9, 9 (hereinafter referred to as side clutch levers 9, 9). Further, in this case, the side brakes 33, 33 of the front wheels 2, 2 are the side on which the traveling power is cut when the side clutch levers 9, 9 are gripped and the side clutch 32 is disengaged and then the levers 9, 9 are gripped further. The front wheels 2 and 2 are braked.

  The farm vehicle has a small diameter at the lower side of the front part in a state where the steering wheel 5 is grasped and pushed down, the rear part of the vehicle body is lifted with the front wheel as a fulcrum, and the rear wheels 3 and 3 as steering wheels are floated from the ground. The pair of auxiliary wheels 62 can be grounded and can be driven while walking while driving the front wheels 2 and 2. At that time, if the operator grasps the side clutch lever 9 on one side of the left and right sides (turning inside), the operated one side clutch 32 is disengaged, and the traveling power to one of the front wheels 2 and 2 is interrupted. The braking force by the side brake 33 works to make a brake turn, and the vehicle body turns on the spot.

  In addition, the farm work vehicle has, for example, the weight of the operator and the weight of the engine 14 in the state where the operator is on board in comparison with a configuration in which the weight of the engine and the cockpit, that is, the operator is concentrated on the driving wheel side. Since the weight on the side of the rear wheel 3 is reduced by an amount corresponding to the weight of the operator during the walking operation, the rear part of the vehicle body can be lifted with a small force using the front wheel 2 as a fulcrum. it can. Therefore, the posture of the vehicle during work, and thus the posture of the working unit, is stable, and uniform work or stable running can be performed.

  Next, the work implement mounting portion 8 will be described.

  As shown in FIG. 2, the work implement mounting portion 8 is configured using a space portion formed between the front wheels 2, 2 and the rear wheels 3, 3 below the body frame 1. However, in the illustrated example, the two work machines 7 and 7 can be separately transmitted to the left and right, and can be mounted freely up and down.

  Hereinafter, transmission and raising / lowering of the work machine 7 on one side will be described.

  First, as shown in FIG. 2, the chain case 45 is provided with a work gear 7 (in the embodiment, a rotary tiller) in the lower part and a swing transmission case 47 in which the upper part is formed as a parallel link together with the link 46. Are connected to each other. The elevating electric cylinder 48 is configured such that the base is attached to the front side of the body frame 1 and the tip is connected to the outer peripheral portion of the swing fulcrum 47a of the swing transmission case 47.

  In the work machine 7 thus mounted, the rotational power extracted from the power take-off shaft 42 described with reference to FIG. 3 passes from the swinging power transmission case 47 through the chain case 45 to the work machine drive shaft 43 on the lower transmission side. Be transmitted. On the other hand, when the work implement 7 is lowered to the working position, if the lifting / lowering electric cylinder 48 is extended by a switch operation not shown, the swing transmission case 47 forms a parallel link with the swing fulcrum 47a as a fulcrum. The chain case 45 that rotates together with the link 46 that is connected to the front end portion is pushed down and lowered.

  As described above, when the working machine mounting portion 8 operates the lifting / lowering electric cylinder 48 to the expansion side or the reduction side by, for example, a switch operation provided on the handle portion, the swinging mechanism forming a parallel link with the link 46 is formed. The power transmission case 47 can move the chain case 45 up and down with the swinging fulcrum 47a as a fulcrum, and can freely operate the work implement 7 connected to the lower part.

  As shown in FIG. 5, the lifting / lowering electric cylinder 48 is configured to be replaceable by providing a mounting portion 51 on the lower machine casing 50 of the walking operation handle 5, and jacking up the grounding portion at the lower end. The base 52 can be attached and the front part of the vehicle body can be jacked up. In this case, the body frame 1 can be jacked up safely because the pair of left and right rear wheels 3 and 3 and the front wheel 2 on one side are in contact with the ground.

  The above-described configuration can easily adjust the tread of the front wheels 2 and 2 described above with simple means of providing the mounting portion 51 on the lower machine casing 50 of the walking operation handle 5.

  Next, a configuration in which a chemical tank 53 is mounted will be described as a modified example of the farm work vehicle.

  First, as shown in FIG. 6, the chemical liquid tank 53 has a flat side shape between the front wheels 2, 2 and the rear wheels 3, 3 that is long in the front-rear direction and has a lateral width equivalent to the width of the vehicle body frame 1. It is formed and placed on the upper side of the body frame 1, and the upper surface is also used as the operator's step floor. Moreover, the said chemical | medical solution tank 53 forms the protruding expansion part 53a in the front part and the rear part, and is set as the structure which can increase the chemical | medical solution amount to store.

  The chemical liquid tank 53 configured as described above has an advantage that it can be formed compactly with a relatively simple shape and can be mounted with a low center of gravity. In the conventional case, the chemical liquid tank is mounted on the front part or the rear part of the vehicle body frame. Compared to the above, there is a feature that even if the chemical solution increases or decreases, the weight balance between the front and rear and the left and right of the vehicle body is hardly affected. Therefore, even if the control work advances and the chemical solution in the tank decreases, this chemical tank 53 does not lose its working posture and can keep the spraying posture constant.

  When the chemical tank 53 is not mounted, the step floor 54 has a work machine 7 attached to the lower side between the front wheels 2 and 2 and the rear wheels 3 and 3, as shown in FIGS. In this configuration, a plate formed of a transparent material such as resin is attached to the body frame 1.

  With this configuration, when the operator gets on the work, for example, when performing a rotary tillage work, the operator works while visually observing the lower work state through the step floor 54 made of a transparent material. Can be done. Therefore, the operator has a feature that the operator can work accurately while adjusting the direction of the vehicle body and adjusting the speed of the vehicle and the work speed in accordance with the work state on the lower side of the vehicle body frame 1.

  Next, two embodiments for attaching the work implement 7 to the work implement mounting portion 8 will be described.

  First, as shown in FIGS. 9 to 11, the first embodiment is configured by connecting parallel links 55 and 55 to the front ends of the elevating electric cylinders 48 and 48 provided on the left and right sides of the vehicle body frame 1, respectively. is doing. As shown in FIG. 10, the tool bar 56 is configured to freely move up and down by connecting the distal end portion of a link arm 57 having a base portion pivotally connected to the left and right parallel links 55. As shown in the drawing, the work machine 7 is configured by arranging a plurality of devices 7, 7, 7 side by side on the toolbar 56.

  In the agricultural vehicle configured as described above, the lifting cylinders 48 and 48 provided on the left and right sides of the body frame 1 are used, and the tool bar is connected to each other via the parallel links 55 and 55 and the link arms 57 and 57, respectively. 56 is connected and the left and right are integrally formed. A plurality of work machines 7, 7, and 7 are attached in a horizontal arrangement on the toolbar 56 that connects the left and right sides as described above, so that crops can be cultivated and weeded.

  As described above, the work implement 7 can be lifted up and down integrally with each other by connecting the lifting electric cylinders 48 on the left and right sides of the body frame 1 as described above, and can perform a wide work at once.

  Next, in the second embodiment, as shown in FIGS. 12 to 14, when installing the spatula rotor 58 on the left side, the work machine drive shaft 43 of the left chain case 45 is mounted in an inclined state so as to be driven. To do. The right chain case 45 is configured by mounting a rotary tiller 59 and a groove raising device 60 behind it.

  As described above, in the second embodiment, a series of work can be performed by mounting the related separate working machines 7 and 7 performed before and after as work procedures on the left and right. For example, in the case of correcting paddy field, in the forward process, the left side cutting rotor 58 cuts the slope of the process and removes the coating allowance and scrapes the weeds. Next, in the return process, the rotary tiller 60 Then, it is possible to cultivate the edge, and then immediately raise the soil by the grooving device 60 to dug the groove, and work on a sheet such as a cold sheet.

  Agricultural work vehicle constructed as described above is equipped with separate related work machines on the left and right sides, making use of the reciprocation process, plucking on the forward path, and grooving on the return path to complete a series of operations. There is a feature that can be completed by (round trip).

  As described above, the embodiment of the present invention is an agricultural work vehicle having a small and simple structure, and can be provided to general consumers at a low cost because the manufacturing cost is relatively low. The farm work vehicle according to the embodiment is configured such that the cockpit 4 is disposed above the rear part of the vehicle body frame 1 and can be used for riding by grasping the steering handle 6. If the handle 5 is grasped, it is possible to carry out a walking operation, and it is easy to use.

  During the riding operation, the steering operation is performed by the steering handle 6 while maintaining the ground pressure of the front and rear wheels 2 and 3 substantially equally. During the walking operation, the side clutch 32 is operated by operating the lever 9 provided on the operation handle 5 during walking. Can be turned by a brake turn with the side brake 33 applied, and when riding, when it reaches the end of the field, the corner, it gets down and holds the operation handle 5 when walking. By operating the side clutch 32 and combining the small turn by the turn on the spot, the maneuvering in a narrow field can be easily performed.

Then, from either side of the boarding position sitting on the cockpit 4 and the walking work position holding the operation handle 5 during walking, the traveling speed is selected by the shift levers 12F and 12R to freely change and change the operation. It has become something that can be done.

It is a top view of an agricultural work vehicle. It is a side view which shows the frame structure of an agricultural work vehicle. It is a diagram which expands and shows a run transmission mechanism. It is a top view of a body frame. It is a side view of a front wheel side jack-up state. It is a side view of an agricultural work vehicle. It is a top view of an agricultural work vehicle. It is a side view of an agricultural work vehicle. It is a side view of an agricultural work vehicle. It is a rear view of a working machine mounting part. It is a rear view of a working machine. It is the top view which mounted | wore the work machine with 2 stations | sets. It is a rear view which shows the working state of a left working machine. It is a rear view which shows the working state of a right working machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body frame 1b Horizontal frame 2 Front wheel 3 Rear wheel 4 Driver's seat 5 Handle for operation at the time of walk 6 Handle for operation at the time of riding 7 Work machine 8 Work machine mounting part 9 Side clutch lever 10 Traveling transmission mechanism 11 Transmission 12F For operation at the time of walk Shift lever 12R Shift lever for riding

Claims (3)

Body frames 1, 1 are provided on the left and right sides of the vehicle in the front-rear direction.
A pair of left and right front wheels 2, 2 serving as driving wheels is provided at the front of the frame 1, 1,
A pair of left and right rear wheels 3, 3 are provided at the rear of the frames 1, 1 as steering wheels.
In a side view of the vehicle, a cockpit 4 is provided above the left and right rear wheels 3, 3, and an engine 14 is provided above the left and right front wheels 1, 1.
With the engine 14 interposed in the front-rear direction, a walking operation handle 5 is provided at the front of the vehicle body frame 1, and a riding operation handle 6 is provided in front of the cockpit 4.
A farm vehicle equipped with a working machine 7 between the front and rear wheels 2, 2, 3 and 3. A steering operation handle 6 in front of the cockpit 4 is connected to the rear wheels 3 and 3 serving as steering wheels so that the steering operation can be performed. The agricultural work vehicle according to claim 1, further comprising side clutch operating portions (9, 9) for intermittently operating the traveling power of the front wheels (2, 2). A transmission 11 provided in the traveling transmission mechanism 10 from the engine 14 to the front wheels 3 and 3 includes a riding operation speed change lever 12R extended to a position near the riding time operation handle 6 in front of the cockpit 4. 2. The agricultural work vehicle according to claim 1, wherein a walking operation speed change lever 12F extended to a position near the walking operation handle 5 at the front of the body frame 1 is provided so that a speed change operation can be performed from the boarding position and the walking position.

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