JPH08507B2 - Agricultural tow truck - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an agricultural tow vehicle, and more particularly to an agricultural tow vehicle equipped with a rice planting device, a seeding device and the like.

[Prior art]

Conventionally, as is clear from JP-A-57-66018, in a riding type rice transplanter, when the rice transplanter unit is raised during turning, the speed change mechanism is decelerated, and the traveling speed becomes slow and slowly and safely. There was one that was configured to turn.

However, the traveling speed was not reduced even if the cultivated surface of the farm field had severe irregularities.

[Problems to be Solved by the Invention]

In the conventional technology, the traveling speed is changed when the pair of left and right drive wheels largely tilts to the left and right, that is, when the road surface itself is tilted and the vehicle body is tilted. It is dangerous because it travels at high speed without moving, and a riding-type rice transplanter or a riding-type seeder where the working machine side is mounted freely in a rolling manner has a high work speed even if the machine leans to the left or right However, there is a problem that there is a situation in which the work cannot be properly performed without any posture correction.

[Means for solving the problem]

The present invention has taken the following technical means in order to solve the problems of the prior art.

That is, according to the present invention, the drive wheels 2, 2, 6, 6 for traveling are transmitted from the prime mover 9 side through the speed change mechanism, and the pair of left and right drive wheels 2, 2 are oriented in the front-rear direction at the left-right intermediate position thereof. In a self-propelled agricultural towing vehicle provided in a balance-like manner up and down freely around 3, there is provided a detection unit for detecting a difference in left and right heights of the left and right drive wheels 2, 2 and the detection unit is driven. When it is detected that the difference between the left and right heights of the wheels 2 and 2 is large, the speed change mechanism is decelerated, and when the detection unit detects that the difference between the left and right heights of the drive wheels 2 and 2 is small, the speed is increased. The agricultural tow truck is characterized in that the section and the speed change mechanism are connected to each other.

[Operation and effect of the invention]

According to the present invention, when the ground during driving is inclined to the left or right or has unevenness and the left and right driving wheels are largely rolled, this is detected and the speed change mechanism is actuated to the deceleration side to slow the running speed.

That is, if the ground is tilted or there are large irregularities,
The traveling speed is automatically reduced to allow safe traveling, and during agricultural work, the work is performed so slowly that accurate work can be performed.

〔Example〕

1 is a towing vehicle. The pair of left and right front wheels 2, 2 are vertically supported so that the center of the left and right is supported by a shaft 3 in the front-rear direction with respect to the vehicle body and can be steered to the lower ends of both ends of a front-view gate-shaped front axle case 4 which is freely rotatable. It is attached via vertical cases 5, 5 that can be rotated around the core.

The pair of left and right rear wheels 6, 6 are drive wheels that are propelled by the rear sides of the chain cases 8, 8 whose base ends are attached to the left and right sides of the transmission case 7 and that propel the vehicle body together with the front wheels 2, 2. Has become.

The motor 9 is mounted on the front part of the vehicle body and is covered with a hood 10.

Reference numeral 11 denotes a steering wheel, which allows the vertical cases 5 and 5 of the front wheels 2 and 2 to be rotated and steered. 12 indicates a driver's seat.

A rice transplanter 13 is attached via a rolling shaft 16 to a hitch 15 which is vertically movable by an elevating link 14.

17 shows a rice transplanter transmission case, 18 shows a seedling tank, and 19 and 20 show a leveled float on the center side.

A hydraulic switching valve 21 is provided between the central grounding float 19 and the transmission case 17, and when the float 19 rises too much, the piston of the hydraulic cylinder device 22 is projected to rotate the elevating link 14 upward so that the rice planting is performed. The valve 21 is switched so that the device 13 is raised and the rice planting device 13 is lowered when the float 19 is lowered too much.

A belt 23 is wound between the output pulley 24 of the prime mover 9 and the input pulley 25 of the transmission case 7.

The output pulley 24 is a split pulley in which the peach circle fluctuates according to the tension of the belt, and when the tension pressure of the tension pulley 26 abutting on the belt 23 is increased, the pitch circle becomes smaller and the transmission case 7 side is moved. The power transmission becomes slower, and conversely, when the tension pressure is small, the pitch circle becomes large and the power is amplified and transmitted. That is, the tension pulley 26 is operated to continuously change the speed.

The attachment arm 27 of the tension pulley 26 is attached to a support shaft 28 which is freely rotatable on the mission case 7 side, and operating arms 29, 29 are integrally provided at both ends of the support shaft 28, and are vertically mounted on the support arm 28. The long holes 30 of 30 are bored.

Reference numerals 31 and 31 denote rods, the bases of which are attached to the left and right sides of the front axle case 4, and the front end of the vertical rods 31 and 31 are bent and inserted into the long holes 30 and 30. Belt when turning around 3
When the tension pressure of 23 increases and the power is decelerated and transmitted to the input shaft side, and when the left and right front wheel heights are almost the same without turning, the tension pressure decreases and the power is transmitted more speedily. Is configured.

That is, the support shaft 28 and the operating arms 2 provided at both ends of the support shaft 28.
9 ・ 29, vertical long hole 30.3 on the operating arm 29 ・ 29
0, and the vertical rods 31 and 31 which are engaged with the long holes 30 and 30 and whose lower ends are attached to the left and right sides of the front axle case 4,
A detection unit is configured to detect a difference in height between the left and right front wheels 2, 2. Further, by operating the mounting arm 27 of the tension pulley 26 provided on the support shaft 28 of the detection section, the detection section is linked to the transmission mechanism.

To describe the operation of the above example, the front wheels 2 and 2 and the rear wheels 6 and 6 both come into contact with the cultivating surface of the paddy field and are transmission-rotated to propel the towing vehicle 1.

At this time, when the front wheels 2 and 2 rotate around the shaft 3 due to the unevenness of the cultivating surface, one of the rods 31 and 31 attached to the front axle case 4 is pushed upward and the other moves downward. . At this time, the rod 31 on the moving up side has the long hole 30.
The support shaft 28 is rotated by hitting the upper end surface of the belt, and the tension pulley 26 is rotated via the mounting arm 27 to increase the tension force of the belt 23.

At this time, the pitch circle of the output pulley 24 on the side of the prime mover 9 becomes smaller, and the power transmission to the side of the mission case 7 is decelerated. Therefore, the traveling speed is naturally slowed down, and the field with larger unevenness is traveled more slowly.

If a spring as a cushioning member is interposed in the middle of the rod 31, the operation during rapid rolling can be reduced and smooth running can be achieved.

The rotation of the front axle case 4 is electrically detected by the switch SW1, and when the detection is continued by the timer T relay for a certain period of time, the solenoid is not excited until the solenoid hydraulic pressure is switched as shown in FIG. valve
Switch the tension pulley 26 to the hydraulic cylinder.
It may be configured to operate at 33 and have the same function as the front side.

Further, when changing the contacting force of the tension pulley 26 with the hydraulic cylinder 33, as shown in FIG. 5, when the vertical case 5 of the front wheel is rotated more than a certain amount, the switch SW2 is turned on.
Alternatively, the solenoid hydraulic pressure switching valve 32 may be switched to N to reduce the traveling speed.

In this way, if the front axle case 4 tilts when the traveling ground is uneven or when crossing a ridge, the traveling speed is automatically reduced and safe traveling is performed.
Moreover, accurate work can be performed even in such a bad field.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a simplified front view of the main part, FIG. 3 is a perspective view of the main part, and FIG. 4 is another example. 5 is a front view of a main part of another example. In the figure, 1 is a towing vehicle, 2 is a front wheel (driving wheel), 3 is a shaft,
6 is a rear wheel (driving wheel), and 9 is a prime mover.

 ─────────────────────────────────────────────────── --Continued from the front page Judgment panel for referees Judge Akira Shiozaki Judge Judge Yoshikazu Iguchi Judge Toshiaki Tsukiyama (56) References JP-A-57-66018 (JP, A) Shoukai 56-96927 (JP, U) Japanese Patent Sho 57-38209 (JP, B2)

Claims (1)

[Claims] 1. A shaft 3 which transmits drive wheels 2, 2, 6, 6 for traveling from a side of a prime mover 9 through a speed change mechanism, and a pair of left and right drive wheels 2, 2 which are in the front-rear direction at an intermediate position between the left and right sides thereof. In a self-propelled agricultural towing vehicle that is vertically movable around a shaft, a detection unit for detecting a difference in left and right heights of the left and right drive wheels 2, 2 is provided, and the detection unit is a drive wheel. The detection unit decelerates the transmission mechanism when it detects that the difference between the left and right heights of the two wheels 2 and 2 is large, and increases the speed when the detection unit detects that the difference between the left and right heights of the drive wheels 2 and 2 is small. An agricultural towing vehicle, which is characterized by connecting a gearbox and a speed change mechanism.