JPH02225138A - Steering device for tractors, etc. - Google Patents

Abstract

PURPOSE:To facilitate and make smooth the turning of a tractor, etc., by increasing the rotational speed as well as the steeling angle of front wheels following the control by steering front wheels. CONSTITUTION:A speed increasing mechanism 14 is provided on the shaft 12 of a steering wheel 2 in a space toward a power steering 13. When the steering wheel 2 is positioned in a straight-forward neutral zone, the clutch 15 of the speed increasing mechanism 14 is meshed with a low-speed gear 16 and steering operation is made without hanging speed. On the other hand, when the steering wheel 2 is turned in an angular range beyond a specified range, the clutch 15 is meshed with a high-speed gear 17, and interlocking steering operation is made through speed increasing gears 18. Namely, switching of the clutch 15 is made by a shifter 20 operated by a solenoid 16 in an electric circuit 9, and the shifter 20 is turned on and off by a switch 21 interlocked with the steering wheel 2. Thus the operation of the steering wheel and the speed of front wheels 1 are synchronized with each other to make the turning smooth.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a steering device for a tractor or the like.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION In the turning steering operation of a tractor, there is a system in which the inner front wheel to be steered is rotated at high speed in order to improve the steering performance. In this case, the steering angle does not change, so if only the turning speed due to the high speed change of the front wheels changes rapidly with respect to the steering angle, the steering operation feels strange.

Means for Solving the Problems This invention provides a steering wheel (2) for steering the front wheels (1).
) Steering of a tractor, etc., which is constructed in such a manner that the front wheel (1) is increased in speed and the steering angle of the front wheel (1) is also increased when the steering angle is greater than or equal to a predetermined steering angle. The configuration of the device.

Functions and Effects of the Invention During tractor work, the front wheels (1) are steered by operating the steering wheel (2), but when the steering angle of the steering wheel (2) exceeds a predetermined value and the vehicle enters a turn, the front wheels (1) are turned. The transmission rotational speed of the front wheel (1) on the opposite side is increased to make the turn smoother, and at the same time, the steering angle of the front wheel (1) is also increased, so that the steering angle of the steering wheel (2) is increased. As the turning angle of the front wheels (1) increases, the steering angle (2) increases.
) and the turning speed caused by the power transmission of the front wheels (11) can be maintained in harmony, allowing smooth turning operations.

Embodiment When rotating, the tractor body (3) is provided with a pair of left and right front wheels (1) that are linked to the steering wheel (2) at the front, and is equipped with an engine (4) at the rear. A pair of left and right rear wheels (5) are provided to support the engine (4).
), the power is transmitted through four-wheel drive mode, and the driver's seat (6)
has been established. Among these, the transmission device (7) that transmits the front wheel (1) is connected to the rear wheel (5).
A speed increasing device +81 is provided which increases the speed of transmission at approximately twice the speed of the normal transmission rotation. In addition, near the cockpit (6), a switch (Il) is installed in the circuit (9) that can put this speed increaser (8) into a working state, and a solenoid (
11) allows the speed increasing device (8) to be placed in the speed increasing position. Note that this speed increasing device (8) is equipped with a front wheel (1
Using the differential transmission of 1, the front wheel on the outside of the steering wheel (1)
the front wheel (1) from this axle.
In addition to disengaging the transmission clutch to allow free rotation,
The front wheel (1) on the inner side of the steering wheel may be configured to be differentially rotated at a speed twice as high as the steering speed, thereby transmitting high-speed turning.

A speed increasing mechanism 04 is provided between the steering (2) axis 0δ and the power steering (13).
2) In the straight-ahead neutral region, clutch 09 is shifted to low gear (I
The clutch (19) is engaged to the high gear (1η side) and speed is increased by rotating the steering wheel (2) from the neutral range to a predetermined angle range or more. The meshing transmission of gear +Ill is configured to interlock the steering with the high speed gear (Ki), speed increasing gear +11, and low speed gear (IE9, etc.).This clutch (1'9)
The switching of this clutch (19
is configured to operate in conjunction with the high speed gear (m side) by turning on the switch Q1) of the circuit (9).The switch 3
1) is turned ON when the steering angle of the steering wheel (2) reaches a predetermined position. Therefore, only when the switch (211) by the steering wheel (2) and the switch (1[I) by the steering wheel (2) are both ON, the steering angle by the steering wheel (2) is linked to the speed increase.

In addition to the upper part, a hydraulic switching valve may be operated by operating the steering wheel (2) to change the steering interlock ratio by the power steering wheel (13).

At this time, the hydraulic switching valve controls the speed increaser! (8) may be configured to simultaneously increase speed.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a partial side sectional view, and FIG. 3 is a circuit diagram. In the figure, (1) is the front wheel, (2) is the steering wheel, (
8) is a speed increasing device, and Oe is a speed increasing gear.

Claims (1)

[Claims] By operating a steering wheel (2) that steers the front wheel (1) at a steering angle greater than a predetermined value, the speed of the front wheel (1) is increased and the steering angle of the front wheel (1) is also increased. A steering device for a tractor, etc. that has a steering-linked configuration.