JPS63287680A - Steering gear of movable agricultural machine - Google Patents

Abstract

PURPOSE:To facilitate turning operation of a vehicle by contriving the deflection degree of an working equipment towed by a chassis to be bigger when the vehicle is making a turn than when it is progressing straight ahead. CONSTITUTION:A cam 32 of a cylindrical shape having a partially notched portion 31 is provided on the top end of a final case 30 of a front axle 29 which is moved rotationally around a kingpin 28 by a steering wheel shaft 27 through a steering link 26. The tip portion of an arm 35 fixed rotatably on a front shaft case 33 that supports the final case 30 is adjacently engaged with the notched portion of the cam 32. An arm 38 projecting to the side from a machine 16 is actuated by the rotational movement of the arm 35 through rods 36, 37. As the front wheel of this mechanism is steered, a working unit 6 makes a rotational movement around a yawing shaft 17 causing the deflection link motion to make the working equipment turn toward the direction opposite to that of the chassis 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a steering device for mobile agricultural machinery, and can be used in seedling planting machines, fertilizing and seeding machines, transport vehicles, and other tractor working machines.

Prior Art and Problems to be Solved by the Invention Work that involves planting seedlings on the soil surface while pulling a working device by sliding a float part on the rear side of a tractor to the ground, like a seedling transplanter. In some aircraft configurations, in order to reduce the steering or turning radius and make steering easier, there is a configuration in which the working device for the vehicle body is deflected in the opposite direction to the steering direction as the steering operation is performed. Since the steering and turning radius are significantly different between the straight-line movement for seedling planting and the turning movement at the edge of the field, it is difficult to perform the deflection operation of the working device at the same rate in the straight movement configuration and the turning movement. This is undesirable as it causes the shoots of the seedlings to be greatly bent.

Means for Solving the Problems The present invention provides a front wheel (2) steered by a steering wheel (1) and a rear wheel (4) operated by a steering brake (3).
) to the vehicle body (5), the control handle (1
A steering system for a mobile agricultural machine is provided with a steering interlocking device (7) that is interlocked to decrease the steering brake depending on the steering of the steering brake (3) and increase it depending on the steering of the steering brake (3).

Effect of the Invention A predetermined work is carried out while towing the working device (6) by the traveling propulsion of the vehicle body (5). During work traveling in a straight line, steering is mainly performed only by operating the steering wheel (1), and the steering interlocking device N (7) is used to control the steering interlocking of the front wheels (2) as well as the working device W (6). The rear side of the vehicle is slightly swung toward this steering side to deflect it and align it with the desired straight running direction.

Also, when turning at the edge of the field after straight-ahead work, the operating angle of the steering handle +1) is increased to interlock the steering of the front wheels (2).

When the steering brake (3) is applied, the rear wheel (4) on the turning side
) is braked to turn the vehicle body (5), and at the same time, the steering interlocking device i (7) greatly deflects the work device (6) with respect to the vehicle body (5), resulting in one work device t+
Reduce the turning radius of 61.

Effects of the Invention As described above, by the steering operation in the straight traveling stroke and the turning operation in the turning stroke, the degree of deflection of the working device (6) towed by the vehicle body (5) can be controlled by controlling the steering handle (1) or the steering wheel by these operations. Steering interlocking devices (7) such as steering brakes (3)
), it is linked and deflected differently,
When working with the work equipment W (6) in a straight stroke, the deflection of this work equipment (6) can be reduced to reduce the bending of the work line, and when making large turns such as turning, , the deflection of the working device (6) can be increased to facilitate turning, and the turning radius of the working device (6) can be reduced.

Embodiment 1 In FIGS. 1 to 4, the vehicle body (5) has a pair of left and right front wheels (2) at the front that are steered by a steering handle (1), and a rear has a pair of left and right rear wheels (4) which are equipped with a steering clutch and a steering brake (3) and are rotated in conjunction with each other, and these front wheels (2) and rear wheels (4) are connected to the driver's seat ( 8) Rotation is driven by the prime mover (9) mounted below. A pair of left and right steering pedals (1υ0δ) are provided at the front of the control floor fl [I. When the left steering pedal (I+) is stepped on, the left steering clutch is disengaged, and when it is further depressed, the left steering clutch is disengaged. The vehicle body ( At the rear of the vehicle body (5), an upper link (13) and a lower link (toward) are pivotally attached to the rear so as to be able to move up and down, and a lift cylinder (19) connected to the vehicle body (5) is raised and lowered by expanding and contracting hydraulic pressure. The rear link (Ill.
The main body of the seedling planting device (IQ), which is the working device (6), is connected to a vertical yawing axis (allowing it to rotate left and right around the field).

The seedling planting device is equipped with a float (Fj and float sensor (to) at the bottom of the IG that can swing up and down around the rear spindle G!1), and a seedling tank at the top that stores the seedlings. A planting device N (23) for separating and planting seedlings supplied from this seedling tank (2δ) is installed at the rear, and the configuration is such that seedlings are planted while sliding on the soil surface. )
is interlocked with the lift cylinder provided at the rear of the vehicle body (5) + the lift control valve of the hydraulic circuit 19 through the link mechanism Q4. When the control well 4 is switched from the neutral position to the raised position, the seedling planting device is raised by extending the lift cylinder (19), and conversely, when the aircraft aS rises higher,
Switch from the neutral position to the lowered position and control the raising and lowering of the seedling planting device to lower it, maintaining the height of the seedling planting device at a constant height, and maintaining the seedling planting depth at a constant level. It consists of

Regarding the steering linkage device (7), the final case (to) of the front wheel axle (to) rotated from the handle shaft (5) of the steering handle (1) to the kingpin (to) via the steering link (to) A circular cam (to) that partially forms a notch part OrJ is provided at the upper end, and is pivoted to the front wheel axle case (to) that supports this final case (to) so as to be freely rotatable back and forth.
The distal end of the arm (to) is brought into close engagement with the notch Gυ of the cam (2). Front wheel (2) king pin (to)
The arm (to) can be rotated back and forth by an appropriate angle by the steering rotation, and by the rotation of this arm (to), it is possible to move from the body +IQ to the side via the rod (to) (5). By operating and rotating the control handle 1) 1, the front wheel (2) is steered and the working device (6) is rotated around the yawing axis (m) toward the steering side. Deflection is interlocked so that the direction of the working device (6) is directed in the opposite direction to the direction of the vehicle body (5).

One end of the bell crank (to) is loosely engaged with the connecting portion of the front and rear rods (to), and this bell crank (to) is pivotally attached to the rear of the vehicle body (5), and Said steering pedal (
1)) (The bell crank ■ which is pivoted (1) to the vehicle body (5) so as to rotate in forward and reverse directions from 121 through the rod ao14a and the bell crank (to) is connected by the rod ■,
By stepping on the steering pedal (1υ or tapping) the rod ■,
The seedling planting device is provided in such a manner that the seedling planting device is deflected around the yawing axis (one direction) to a greater extent than the deflection rotation by the control handle (1).The beak is a power extraction shaft that transmits the working device (6). be.

In addition, the notch angle of the notch 0υ of the cam (to) is appropriately larger than the width of the arm (to), so that when the steering rotation of the front wheel (2) turns more than a predetermined angle, the arm (to) This notch O
The steering interlocking device (7) may be provided in an interlocking relationship by being engaged with the edge of B. In this configuration, in the straight-ahead process, steering operation within a predetermined range is performed only by steering the front wheels, and when this range is exceeded, deflection rotation of the working device (6) is performed.

In FIGS. 5 to 7, the difference from the upper side is as follows.

If the boss part at the front end of the machine body (lB) is supported by a spring (a) with respect to the yawing axis (field), and the seedling planting device is supported by raising the link Tl31 (+4 by the lifting cylinder (1g), this boss The boss part moves downward against the spring), and by this downward movement, the regulating cam (G) regulates the directional position of the boss part. By moving, the seedling planting device can be fitted and guided by the cam groove mallet and returned to the position on a straight line in the front and back direction with respect to the vehicle body (5). When the position is moved to , the boss part (3) moves to the upper part, and the deflection control is performed.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partial plan view, Fig. 2 is a partially enlarged plan view, Fig. 3 is a partial side view, and Fig. 4 is a side view. , FIG. 5 is a side view showing a part of another embodiment, FIG. 6 is a front sectional view thereof, and FIG. 7 is a plan view thereof. In the figure, (1) is the steering wheel, (2) is the front wheel, (
31 is the steering brake, (4) is the rear wheel, (5) is the vehicle body,
(6) indicates a working device, and (7) indicates a steering interlock device.

Claims (1)

[Claims] A vehicle body (5) equipped with a front wheel (2) that is steered by a steering handle (1) and a rear wheel (4) that is operated by a steering brake (3) is attached to the vehicle body (5). The vehicle body (5) of the work device (6) that performs a predetermined work while being towed
A mobile agricultural machine is provided with a steering interlocking device (7) which is configured to reduce the left and right deflection of the steering wheel (1) depending on the steering of the steering handle (1) and to increase it depending on the steering of the steering brake (3). Steering device.