JPH03277202A - Lower link sensor of tractor - Google Patents

Abstract

PURPOSE:To maintain accurate detection and to simplify constitution of a connecting part of working device of the rear part of body, by connecting a left and a right lower links to a link sensor to detect difference in relative vertical movement between the left and the right lower links with wires. CONSTITUTION:Vertical movement of a left and a right lower links 3 and 4 ire interlocked through wires 6 and 7 to a link sensor 5 to detect difference in rotation between a potensioarm 20 and a potensioshaft 21. When the difference in rotation becomes a value corresponding to an angle of inclination of body while inputting the difference in rotation to a controller, expansion and contraction of expansion controller is stopped and a power tiller is maintained in a tilling attitude of left and right horizontal shape.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a lower link sensor for a tractor, and is used when performing work while controlling and maintaining a working device connected to the rear of the tractor body in a horizontal horizontal position. , a link sensor for detecting the left and right inclination angle of the working device with respect to the vehicle body. It can be used when cultivating while maintaining the tilling device in a horizontal position regardless of whether the vehicle body is tilted left or right.

(Prior art and problem to be solved by the invention) By detecting the relative vertical movement difference between a pair of left and right lower links,
Alternatively, some systems for detecting the left and right inclination angle of the working device with respect to the vehicle body include a detection link mechanism extending between left and right lower links, and a sensor that detects the difference in operation of the detection links. In such a configuration, the detection link mechanism may not move smoothly due to friction, dirt, etc., resulting in errors in detection.

Accurate horizontal control may not be maintained.

(Means for Solving Problem 11) The present invention includes a pair of left and right lower links 3.4 that are rotated relative to the vehicle body 2 by the vertical movement of the lift arm 1, and a pair of left and right lower links 3.4 that are attached to the vehicle body 2 side and The lower link sensor of the tractor is configured to detect the difference in relative vertical movement between the lower links 3 and 4, and to connect it to the link sensor 5 with a wire 6.7.

(Function) When performing work by connecting a working device between the lower links 3 and 4, if the relationship between the vehicle body 2 and the working device is parallel to each other, the lower links 3 and 4 are connected to the left and right lower links. Wire 6.
7 is pulled by the same amount, and the link sensor 5 does not detect the relative vertical movement difference between the left and right lower links 3 and 4, but the vehicle body 2
When a relative inclination angle between the lower link and the working device is generated, a difference in vertical movement occurs between the left and right lower links 3.4, which is detected by the link sensor 5 via the wire 6.7. By detecting the vertical movement difference between the left and right lower links 3 and 4 by the link sensor 5, the left and right lower links 3 and 4 are controlled to move up and down, thereby controlling the left and right horizontal posture of the working device.

(Effects of the Invention) In this way, the vertical movement difference between the left and right lower links 3, 4 is detected by the wires 6.7 connected to the lower links 3, 4 in conjunction with the link sensor 5. The interlocking of the sensor 5 is smooth, and there is little resistance that occurs when a link mechanism or the like is used, accurate detection can be maintained, and the configuration of the working device connection section at the rear of the vehicle body 2 can be simplified.

(Example) In FIGS. 1 and 2, a tractor body 2 has a pair of left and right front wheels 8 provided at the front portion thereof, which can be freely steered by a steering handle 9, and also has an engine 10 mounted thereon.

A pair of left and right rear axles 11 are provided at the rear, and a driver's seat 12. And at the bottom of the rear fender 13, etc., there is a hydraulic system! 14 and a controller 1 having a microcomputer
There is a 5th class.

A lift arm 1 is provided on the rear end of the vehicle body 2 and is moved up and down by the hydraulic device 14, and a pair of left and right lower links 3 and 4 are provided below to be able to move up and down. are connected by lift rods 16 and 17. These lift rods 16 and 17 are equipped with telescopic cylinders j8.
, 19 are provided to connect the lift arm l and each lower link 3.4.
It is provided to control the expansion and contraction of the distance between the two. The vertical movement of the lift arm 1 raises and lowers the pair of left and right lower links 3.4 at the same time by the same amount, and the height of each lower link 3.4 relative to the lift arm 1 is changed by hydraulic expansion and contraction of the telescopic cylinder 18.1'9.

From the left and right lower links 3 and 4 are wires 6.7,
It is connected to a link sensor 5 consisting of a potentiometer provided at the rear of the vehicle body. This link sensor 5 has a wire 6 on one side connected to a potentiometer arm 20 on the outer periphery, and a wire 7 on the other side connected to an arm 22 of a potentiometer shaft 21 at the rotation center of the arm 20.
0 and the potentiometer shaft 21, the angle is measured by the potentiometer, and this detected value is input to the controller 15. Reference numeral 23 denotes a bracket attached to the side of the vehicle body 2. The potentio arm 5 is attached to a mounting plate 24 which is rotatable with respect to the bracket 23 with bolts 2.
Install in step 5. 26 and 27 are outer wires that cover the outer periphery of each inner wire 6.7.

One example of working equipment is a tiller! 28 is attached across the rear ends of the lower links 3, 4 and the top link 29. Further, the power intake shaft at the rear of the vehicle body 2 and the input shaft 30 of the tilling device 28 are connected by an interlocking shaft to transmit tilling power.

To explain the horizontal control by the tilling device 28 as an example, when the inclination sensor detects the inclination angle of the vehicle body 2 or the tilling device 28 to the left or right, the controller 15 expands and contracts the telescopic cylinders 18 and 19, and the vehicle body 2 The lower links 3 and 4 are moved up and down corresponding to the inclination angle of , the tilling device 28 is rolled and its attitude is controlled horizontally in the left and right directions, and the soil surface is tilled horizontally in the left and right directions. By moving the left and right lower links 3 and 4 up and down in this way, the link sensor 5 is linked via the wire 6.7 to detect the rotation difference between the potentiometer arm 20 and the potentiometer shaft 21, and this rotation While inputting the difference into the controller 15,
When this rotation difference reaches a value corresponding to the inclination angle of the vehicle body 2,
After stopping the expansion and contraction of the telescopic cylinders 18 and 19, the tilling device 2
8 is maintained in a left and right horizontal plowing posture.

In Figs. 3 and 4, what is different from the upper side?

The link sensor 5 is replaced with a potentiometer type and is a stroke sensor, and a telescopic cylinder 31 is used.
The wire 6 on the lower link 3 side is connected to the piston 32, and the wire 7 on the lower link 4 side is connected to the cylinder 31. Further, this link sensor 5 is provided directly below the cockpit 12 so as to be slidable in the direction of the cylinder.

In addition, FIGS. 5 to 7 show the rear fender 13.

An operation box 3 that houses operation switches 33 such as controllers, especially hydraulic control device-related switches and dials.
4, it has a lid 35 that can be opened and closed, and a connector 36 for connecting a checker for checking the functions of the operation switches 33 is provided inside the operation switches 33. This allows you to easily connect the checker, and when the checker is not in use, use the lid 3.
5 can make the connector 36 waterproof.

37 is a lift lever, and 38 is a position lever, both of which are provided outside the operation box 34.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view of a tractor, Fig. 2 is an exploded slope view of a portion thereof, Fig. 3 is a side view showing a partially separate embodiment, and Fig. 4 is a side view of a tractor. is a partial plan view, 5th
The figure is an enlarged side view of a part, FIG. 6 is a front sectional view thereof, and FIG. 7 is a plan view. (Explanation of symbols) 1 Lift arm 2 Vehicle body 3.4 Lower link 5 Link sensor 6.7 Wire

Claims (1)

[Claims] Difference in relative vertical movement between a pair of left and right lower links 3, 4 that are rotated relative to the vehicle body 2 by the vertical movement of the lift arm 1, and these left and right lower links 3, 4 that are attached to the vehicle body 2 side. Wires 6 and 7 are connected between the link sensor 5 that detects
Tractor lower link sensor connected with