JP2000296790A - Three-wheeled husbandry work vehicle for riding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve traveling stability by adjusting a front wheel to an inter- ridge position by striding over a ridge by left/right rear wheels and laterlally rotating a front frame, by longitudinally dividing a machine body frame in a midway part, and laterally rotatably connecting a rear part of the front frame in a rear frame front part. SOLUTION: A front wheel 2 of one wheel is supported in a machine body frame front part, and rear wheels 3, 3 of two wheels are supported in a rear part to constitute a three-wheeled driving vehicle. A machine body frame is formed in a step difference shape in a longitudinal directional almost central position, the front side is formed as a front wheel frame 1a, and the rear side is formed as a rear frame. The front wheel frame 1a is laterally rotatably supported, and a work machine frame 1c is projected forward from the lower part. A front case 7 is fixed to a front part of the front wheel frame 1a, and the front wheel 2 is supported in the lower part via a front wheel driving case. A work machine 40 is suspended by a work machine frame 1c to be thereby guided to a proper place of a rice field to reliably perform husbandry work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body frame which is long in the front-rear direction and has one front wheel and two rear wheels arranged at the front and two rear wheels at the rear. The present invention relates to a three-wheeled riding management work vehicle capable of adjusting the right and left positions.

[0002]

2. Description of the Related Art In the prior art, a three-wheel drive type in which a body frame is arranged in the front-rear direction, one front wheel is arranged as a steering wheel at a front part of the body, and two rear wheels are arranged at a rear part. 2. Description of the Related Art A riding type working machine in which a power unit is provided at a rear portion, an operating unit is provided above and in front of the power unit, and a working machine is provided at an abdomen between a front wheel and a rear wheel so as to be able to move up and down is known. Also, the rear wheel is slidably provided on a shaft that transmits driving force to the left and right rear wheels, and the axle that transmits power to the rear wheel is provided so as to be extendable, and the axle case that stores the axle is used as the rear axle case. A technique is also known in which the right and left rear wheels are provided so as to be slidable left and right so that the treads of the right and left rear wheels can be adjusted according to the width of the ridge.

[0003]

However, in a conventional three-wheeled riding management work vehicle, only the treads of the left and right rear wheels are adjusted, and the front wheels are supported by the left and right centers of the body and run in the center. Therefore, it could not be used in the case of a wide ridge, and it was not possible to run over a straddle.
In addition, because it was configured to work while running across the ridge, the vehicle height is high so as not to damage the crop on the ridge, and when working on slopes, the operator on the driver's seat He felt that the inclination was large, the center of gravity was high, and he was working in an unstable state.

[0004]

The present invention uses the following means in order to solve such a problem. That is, a three-wheeled riding system in which a long body frame is provided in the front-rear direction, one front wheel is supported at the front of the body frame, two rear wheels are supported at the rear, and a working machine is suspended between the front and rear wheels. In the mold management work vehicle, the body frame is divided into front and rear portions at front and rear portions, and a rear portion of a front frame is connected to a rear portion of a front portion of the frame so as to be rotatable left and right. Further, the machine frame is divided into front and rear portions in the middle of the front and rear, a working machine frame is protruded forward from a rear front portion of the frame, and the working machine is suspended from the working machine frame.

[0005]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is an overall side view of a riding management work vehicle having a rotary cultivator mounted on an abdomen, FIG. 2 is an overall plan view, FIG. 3 is an overall front view, and FIG. 4 is a diagram in which a front wheel is moved forward of a right rear wheel. Front view of the riding type management work vehicle in the folded state,
FIG. 5 is a plan view of the same, FIG. 6 is a front view of the riding type management work vehicle in a state where the front wheels are moved to the right side from the left and right center positions, and FIG.
8 is a plan view of the same, FIG. 8 is a front view of the riding management work vehicle on a slope, FIG. 9 is a partial side sectional view showing a power transmission configuration to a front wheel in the body frame, and FIG. 10 is a body frame. FIG. 4 is a partial side sectional view showing a configuration for transmitting a handle operation in the inside.

1 to 3, the overall structure of a three-wheeled riding management work vehicle 15 will be described. Driving unit 16
Is disposed at the rear of the body frame 1 which is long in the front-rear direction. An engine 17 is mounted on the rear end of the body frame 1, and a transmission case 18 is provided at an output side of the engine 17.
The transmission speed is transmitted by the transmission case 18, and power is transmitted to the rear wheels 3 via the rear axle cases 4.4 and the drive cases 5.5 arranged below the transmission case 18. On the other hand, a power transmission shaft 9 is inserted into the body frame 1 (FIG. 9), a front case 7 is provided at the front part of the body frame 1, and front wheels are rotatable right and left around a vertical direction below the front case 7 as an axis. A three-wheel drive vehicle is configured by mounting a drive case 8 and supporting and driving one front wheel 2 on the front wheel drive case 8.

The engine 17 is provided with a bonnet 10
The vehicle body cover 11 which covers the transmission case 18 and the rear wheels 3.
The driver's seat 12 is placed on the vehicle body cover 11, and a steering column 13 is erected on the body frame 1 in front of the driver's seat 12. A steering handle 14 projects above the steering column 13.

The body frame 1 is formed in a stepped shape at a substantially central position in the front-rear direction, the front side is a front wheel frame 1a, the rear side from the stepped portion is a rear frame 1b, and the rear frame 1b is formed of a horizontal portion and a horizontal portion. The front part is formed in a substantially L-shape when viewed from the side with a vertical part standing upright. A front wheel frame 1a is supported at the front upper part of the vertical part so as to be rotatable left and right, and a working machine frame 1c protrudes forward from the lower part. Have been. A front case 7 is fixed to the front part of the front wheel frame 1a,
The front wheel 2 is supported below the front case 7 via a front wheel drive case 8. The working machine frame 1c
The working machine 40 is suspended from

The front wheel frame 1a and the rear frame 1b
As shown in FIGS. 1 to 5, the connecting bracket 45 has vertically extending support brackets 46 projecting from the front upper portion of the rear frame 1b.
The rear portion of the front wheel frame 1a is inserted between the front wheel frame 1 and the support brackets 46 and 46 and the front wheel frame 1a.
a can be rotated left and right.

An actuator is interposed between the front wheel frame 1a and the rear frame 1b, and in this embodiment, a hydraulic cylinder is disposed on the right side.
That is, a pair of upper and lower brackets 41 is provided on the right side surface of the rear portion of the front wheel frame 1a so as to protrude laterally.
A pair of upper and lower brackets 42 are also provided on the right side of the front upper portion of the rear frame 1b behind 41. The base of a front wheel frame swing cylinder 43 is pivotally supported as an actuator by the brackets 42 and 42 by a support pin, and the rod of the front wheel frame swing cylinder 43 is pivotally supported by the brackets 41 and 41 by a support pin.

The front wheel frame swing cylinder 43 is a double-acting hydraulic cylinder, and can be locked at any position within the stroke. By heightening the rod of the front wheel frame swing cylinder 43, the front wheel frame 1a can be swung to the left, and by contracting the rod, the front wheel frame 1a can be swung to the right, and the front wheel frame 1a can be turned left and right. .

The working machine frame 1c is a front wheel frame 1.
a, which has a width substantially equal to the width a, and is projected forward along the lower surface of the front wheel frame 1a in a side view, and the front end extends to a position immediately below the front case 7 and is bent downward from this position. Thus, an attachment portion is formed. A front part of a parallel link mechanism 20 composed of an upper link and a lower link is connected to the mounting part, and a work implement hitch 21 is mounted on a rear part of the parallel link mechanism 20. A hydraulic cylinder 22 is interposed between the parallel link mechanism 20 and the front of the working machine support frame 1c, so that the working machine 40 attached via a working machine hitch 21 can be moved up and down.

Below the work machine hitch 21, a central portion of a bar-shaped toolbar 23 extending in the left-right direction is fixed. One or a plurality of working machines 40 can be attached to the center portion and the left and right side portions of the toolbar 23 so that the attachment position can be changed.

In the present embodiment, a rotary tiller is mounted as the working machine 40. The rotary tiller,
A mounting portion externally fitted to the toolbar 23, a chain case 25 fixed to the mounting portion, a cultivation claw 26 implanted on a shaft pivotally supported below the chain case 25,
6 is provided with a cover 27 on which the beam is projected.
A cultivation board 31 for performing ridge setting with 0 is fixedly provided. In addition, the working machine 40 is not limited to a rotary tiller, and a rake-shaped rake or the like for removing weeds may be arranged.

A power input case 36 is fixed substantially at the center of the toolbar 23 in the left-right direction, and right and left power shafts 38 are supported by the power input case 36, and a plurality of power shafts 38 are arranged in the left-right direction. Power can be transmitted into the upper part of the chain case 25 of each rotary tiller. The power input case 36 has a universal joint 3 capable of expanding and contracting the power decelerated in the transmission case 18.
The power is transmitted via 7.

As described above, the work machine 40 is suspended from the work machine support frame 1c, and the work machine support frame 1c is fixed to the rear frame 1b. As described above, the front wheel frame 1a is fixed to the rear frame 1b. The working machine 40 arranged below the front wheel frame 1a does not shift left and right with respect to the driving unit 16 and the rear wheel 3.3 position (running position of the body) even if the working machine 40 is swung right and left. The management work can be surely performed by guiding to.

Next, a configuration for transmitting power to the front wheels 2 and the rear wheels 3 will be described. In the mission case 18,
As shown in FIGS. 1 and 9, the power of the engine 17 is input via pulleys, belts and the like (not shown). An HST transmission 19 as a main transmission mechanism is disposed on a side portion of the transmission case 18, and the power from the engine 17 is continuously variable by the HST transmission 19, and the power after the continuously variable transmission is transmitted to the transmission. The sub speed is changed in the case 18,
Power is transmitted into the drive case 5 via an axle or the like (not shown) in the rear axle case 4, and drives the rear wheel shaft 3 a pivotally supported below the drive case 5 to drive the rear wheel 3 to travel.

An axle or the like in the rear axle case 4 is configured to be extendable and contractable, and an axle case (not shown) for housing the axle is slidably supported in the rear axle case 4 to the left and right, and not shown. The axle and the like are expanded and contracted by the power taken out through the clutch mechanism, and the drive case 5.5 and the rear wheels 3.3
Is moved left and right to adjust the tread. The configuration for adjusting the tread of the rear wheels 3, 3 is not limited to the above-described adjustment configuration in which the axle or the like expands and contracts. The configuration for adjusting the rear wheel 3 to the axle 3a that supports the rear wheel 3 below the drive case 5 is provided. The mounting position may be changed to the left and right to perform tread adjustment.

As shown in FIGS. 1, 5 and 9, a PTO shaft 35 is provided in front of the lower portion of the transmission case 18.
And the power synchronized with the engine output is taken out.
Power can be transmitted to 0.

Further, as shown in FIG. 9, the power having undergone the sub-shift is taken out from an output shaft 73 which is supported at the front of the transmission case 18. The driving force is transmitted from the output shaft 73 to the front wheels 2 via the first power transmission shaft 9a and the like. That is, the output shaft 73 is operatively connected to the rear portion of the first power transmission shaft 9a housed inside the rear frame 1b. A transmission case 50 is housed vertically in the front part of the rear frame 1b, and a shaft 50 in which the front part of the first power transmission shaft 9a is supported at the lower part of the transmission case 50.
a, and a shaft 50b which is supported on the upper part of the transmission case 50
Power can be taken out more toward the front wheel frame 1a.

On the other hand, a second power transmission shaft 9b is accommodated along the front wheel frame 1a, and a shaft 50b supported on the upper part of the transmission case 50 and a rear portion of the second power transmission shaft 9b are connected via a universal joint 51. Interlock and link. The universal joint 51 is configured to be expandable and contractable from a spline shaft and a cylindrical shaft that is slidably fitted to the shaft so that the shaft cannot rotate relative to the spline shaft. 51 for the second power transmission shaft 9
b can transmit power.

As shown in FIG. 10, the lower portion of the handle shaft 14a of the steering handle 14 is inserted into the upper front portion of the rear frame 1b, while the front frame 1a is inserted.
A steering transmission shaft 52 for steering and rotating the front wheel 2 is rotatably supported therein, and a universal joint 54 is interposed between a rear portion of the steering transmission shaft 52 and a lower portion of the handle shaft 14a. Even when the steering wheel 14a is rotated left and right, the rotation when the steering handle 14 is steered and rotated is transmitted into the front case 7.

With this configuration, FIGS.
As shown in FIG. 3, when there is a ridge at substantially the center between the left and right rear wheels 3, 3, the front wheel frame swing cylinder 43
Is expanded and contracted so that the front wheel frame 1a and the rear frame 1b are aligned in the front-rear direction, so that the front wheel 2 can travel in the furrow. Then, management work such as middle tillage can be performed by adjusting the working machines 40, 40, 40 to the ridge position.

4 and 5 when the width of the ridge is large.
As shown in the figure, the treads of the rear wheels 3 are also matched to the ridges on both sides. Then, the front wheel frame swing cylinder 43 is tall or reduced, and the front wheel frame 1a is turned right or left to be positioned in one of the left and right ridges.
Adjustment is made so that the front wheel 2 is located in front of the rear wheel 3 (the right rear wheel 3 in the figure). Then, the right and left positions of the working machines 40 are also set so as to be in front of the rear wheels 3. Thus, the management operation can be performed by adjusting the left and right positions.

As shown in FIG. 6 and FIG. 7, when work is performed at a time while straddling three ridges with a small gap between the ridges, the treads of the left and right rear wheels 3.3 are adjusted to the ridge width of three ridges. At the same time, the front wheel 2 rotates the front wheel frame 1a slightly to the left or right from the left / right center position, and is set between the ridges on the side of the center ridge.
The work machine 40 is disposed in front of the left and right rear wheels 3 and at equal intervals therebetween to perform management work.

In the case where the management work is performed by running the sloping field on a contour line, as shown in FIG. 8, the front wheel frame 1a is rotated to the upper side of the slope, and The vehicle travels with the front wheel 2 positioned in front of the wheel 3. When the front wheel 2 and the front wheel frame 1a are rotated to the mountain side in this manner, the center of gravity moves to the mountain side, the allowable fall angle increases, and the vehicle can run stably.

As described above, the treads of the rear wheels 3 are adjusted according to the ridge width, and at the same time, the support position of the front wheel 2 is moved to the right and left appropriate positions, so that the ridge width varies depending on the type of crop and its cultivation method. The wheeled management work vehicle 15 can perform management work such as middle tillage, weeding, and cultivation in various fields, thereby increasing versatility.

[0028]

The following effects can be obtained by the above-described configuration. First, as described in claim 1, a long body frame in the front-rear direction is provided, one front wheel is supported at a front part of the body frame, two rear wheels are supported at a rear part, and a working machine is provided between front and rear wheels. In the suspended three-wheeled riding management vehicle, the body frame was divided into front and rear parts at the front and rear, and the rear part of the front frame was connected at the front part of the rear frame so that the rear part of the front frame could be rotated to the left and right. The left and right rear wheels straddle a plurality of ridges or wide ridges, and the front frame is rotated left and right to adjust the front wheel to the ridge position, thereby improving running stability. In addition, by moving the front wheel to the left and right so that the front wheel does not step on the ridge, all the wheels of the three-wheeled riding management work vehicle can be adjusted to various ridge shapes that differ depending on the type of crop and the cultivation method. In addition, various work machines can be attached to this riding-type management work vehicle to perform management work such as middle tillage, weeding, and cultivation, thereby increasing versatility.

Further, as set forth in claim 2, the machine body frame is divided into front and rear portions at the front and rear portions, and a work machine frame is projected forward from a rear frame front portion, and the work machine is suspended from the work machine frame. Because it was installed, even if the front frame located above the working machine is turned to the left and right, it can work according to the ridge shape and can be supported at the left and right center of the abdomen of the riding type management work vehicle,
It is possible to stably support the work, and it is possible to reliably perform the management work by positioning the work machine in the ridge.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding management work vehicle having a rotary tiller mounted on its abdomen.

FIG. 2 is an overall plan view of the same.

FIG. 3 is an overall front view of the same.

FIG. 4 is a front view of the riding management work vehicle in a state where a front wheel is moved forward of a right rear wheel.

FIG. 5 is a plan view of the same.

FIG. 6 is a front view of the riding-type management work vehicle in a state where the front wheels have been moved rightward from the left and right center positions.

FIG. 7 is a plan view of the same.

FIG. 8 is a front view of the riding management work vehicle in a state where the vehicle is running on a slope.

FIG. 9 is a partial cross-sectional side view showing a configuration for transmitting power to a front wheel in a body frame.

FIG. 10 is a partial side sectional view showing a transmission configuration of a handle operation in the body frame.

[Description of Signs] 1 Body frame 1a Front wheel frame 1b Rear frame 1c Work machine frame 2 Front wheel 3 Rear wheel 15 Riding management work vehicle 40 Work machine 45 Front wheel frame support bracket

Claims (2)

[Claims] 1. A three-wheeled vehicle having a long body frame in the front-rear direction, one front wheel supported at the front of the body frame, two rear wheels supported at the rear, and a working machine suspended between the front and rear wheels. A three-wheeled riding-type management work vehicle, wherein the body frame is divided into front and rear portions at the front and rear portions, and a rear portion of a front frame is connected to a rear portion of a front frame so as to be rotatable left and right. Ride-type management work vehicle. 2. The work machine frame is divided into front and rear portions at front and rear portions, and a work machine frame is projected forward from a rear frame front portion, and the work machine is suspended from the work machine frame. The three-wheeled riding management vehicle according to claim 1.