JPH057403A - Sensor for lift-arm angle of tractor - Google Patents

Abstract

PURPOSE:To facilitate fine control by readily attaching and detaching a lift arm sensor for detection of the rotational angle of the lift arm capable of elevating a working machine combined with a tractor. CONSTITUTION:A setting stay 4 is attached to the machine body 3 on the outside of the arm shaft 2 of a lift arm 1 and a guide edge 5 having a semicircular shape around the above-mentioned arm shaft 2 is formed on the setting stay 4. A lift arm sensor 6 is engaged with the guide edge 5 so as to be set to the arm shaft 2 in a state where its position around the shaft center can be freely controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift arm angle sensor for detecting a vertical rotation angle of a lift arm of a tractor.

[0002]

2. Description of the Related Art The lift arm of a tractor is used for raising and lowering a working machine and for controlling the working depth by vertically adjusting the working machine. For control, a lift arm sensor for detecting the angle of the lift arm is provided. However, although this lift arm sensor needs to be finely adjusted, this operation is troublesome and its configuration tends to be complicated.

[0003]

According to the present invention, a semi-circular arc around the arm shaft 2 is formed on a mounting stay 4 fixed to a machine body 3 outside the arm shaft 2 of a lift arm 1 which rotates up and down. A lift arm angle sensor for a tractor, which is provided so that a lift arm sensor 6 for detecting the rotation angle of the arm shaft 2 is fitted and guided to the guide edge 5 and the position of the lift arm sensor 6 is adjustable around the axis of the arm shaft 2. The configuration is as follows.

[0004]

[Advantageous Effects and Effects of the Invention] As the lift arm 1 is vertically rotated, the lift arm sensor 6 mounted on the mounting stay 4 is interlocked with the lift arm 1 to detect the rotation angle of the lift arm 1. The detection value detected by the lift arm sensor 6 is fed back to the control device. The attachment and detachment of the lift arm sensor 1 is performed by fitting into and detaching from the guide edge 5 of the attachment stay 4, and the attachment position is adjusted by loosening the fastening tool and pressing the lift arm sensor 1 against the guide edge 5. In this state, if the lift arm sensor 1 is rotated along the guide edge 5, the lift arm sensor 1 can be rotated around the axis of the arm shaft 2 and fine adjustment can be performed.

In this way, with the lift arm sensor 6 fitted to the guide edge 5 of the mounting stay 4, the lift arm sensor 6 is rotated while being guided by the guide edge 5 to finely adjust the mounting position. Therefore, not only the mounting of the lift arm sensor 6 but also the mounting position can be adjusted easily and easily, and the configuration can be simplified.

[0006]

EXAMPLE A tractor vehicle body 7 is provided with a rear axle housing 8 in the left-right direction at a rear portion thereof, a rear wheel 10 provided at an axle 9, a hydraulic case 11 at an upper portion thereof, and a hydraulic cylinder, a control valve and the like inside. Provided and equipped with a control device. 12 is a cockpit and 13 is a fender.

A pair of left and right lower links 14, a top link 15, a power take-off shaft 16 and the like are provided on the rear side of the vehicle body 7, and the lift arm 1 is integrated with the left and right ends of the arm shaft 2 at the rear of the hydraulic case 11. It is mounted to rotate. The left and right lift arms 1 are connected by a lower link 14 and a lift rod 17 on the opposite side.
Lower link 14 and top link 15 by lifting and lowering
Can be moved up and down, and a working machine mounted on the rear side of them, for example, the tiller 18 can be moved up and down. The cultivating device 18 has a cultivating claw 20 arranged around a cultivating shaft 19 and a flat plate 22 movably provided up and down on the rear side of the cultivating cover 21 to flatten the cultivated trace. Reference numeral 23 is a tilling depth sensor for detecting the rotation angle of the flat plate 22, and is for detecting the tilling depth. 24 is a gauge wheel.

The lift arm sensor 1 is composed of a potentiometer and is fixed to the mounting stay 4 with a case 25.
Has a guide surface 27 formed in a circular surface around the sensor rotation shaft 26 in the central portion, a mounting arm 28 protruding outward, and the like, and the sensor rotation shaft 2 formed on the mounting arm 28.
The bolts 30 are inserted through the elongated holes 29 around 6 and further inserted through the mounting stays 4 so that the nuts 31 are tightened and fixed. An arm 33 having a long hole 32 is integrally attached to the arm shaft 2 side of the rotating shaft 26, and the arm 33 is engaged with an engaging pin 34 protruding from the lift arm 1 to rotate the lift arm 1. The sensor rotation shaft 26 is configured so as to be concentrically rotatable.

The mounting stay 4 is formed with an arcuate guide edge 5 into which the guide surface 27 can be fitted, and is attached to the machine body 3 such as a transmission case integrated with the vehicle body 7 with a fastener 35. The lift arm sensor 1 is attached and detached with a bolt 30 and a nut 31, and by loosening the bolt 30, the case 25 is rotated along the guide edge 5 to be fixed at a proper position by tightening the bolt 30. ..

Reference numeral 36 denotes a sensor cover, which is constructed so as to cover the sensor rotation shaft 26 side of the mounting stay 4, and a long hole 37 is provided in the rotation range of the engagement pin 34. Reference numeral 38 denotes a changeover switch which can be operated from the cockpit 12 and drives the traveling wheels of the tractor such that the rear wheels 10 only drive the rear wheels (2W).
D), front and rear wheel drive mode in which both the front wheel and the rear wheel 10 are driven (4WD), and mode in which one side of the front wheel is braked and the front wheel on the other side is driven at high speed to perform turn steering (full turn)
And is switched.

This changeover switch 38 is used for the controller 3
9, a front and rear wheel drive clutch 42 operated by solenoid valves 40 and 41 and a full turn clutch 43 are provided. In the circuit of the changeover switch 38, there is a steering switch 44 which is turned on by a turning angle of a steering wheel for steering a front wheel, and a one-side brake switch 45 which is turned on by braking a wheel brake on the steering wheel of the front wheel, for example. And the like, and the rear wheel drive mode (2
WD), front and rear wheel drive mode (4WD), and full-turn steering.

A clutch case 47 is provided on a part of the transmission case 46 of the vehicle body 7, and a part of the front wheel take-out gear 48 of the transmission for driving the rear wheels 10 is connected to an intermediate shaft 49.
And a front wheel drive shaft 52 which is interlocked with a differential device of the front wheels via the intermediate gears 50 and 51, and is of a friction plate type which is turned on and off by the solenoid valves 40 and 41 on the front wheel drive shaft 52. A front and rear wheel drive clutch 42 and a full turn clutch 43 are provided.

When the front and rear wheel drive clutch 42 is operated to be engaged, the front and rear wheel drive gear 53 passes through the clutch 42 from the front and rear wheel drive gear 53 which is always meshed with the small diameter intermediate gear 5 on the intermediate shaft 49, and the front wheel drive shaft 52. Is linked to. At this time, the front wheels and the rear wheels 10 have substantially the same rotation ratio. When the full turn clutch 43 is operated to be engaged, the full turn gear 55, which is always meshed with the intermediate gear 50 having a large diameter (for example, twice the gear 51) on the intermediate shaft 49, is passed through the clutch 43 and the clutch body 54, the front. It is interlocked with the wheel drive shaft 52. At this time, the front wheels are transmitted to the rear wheels 10 at high speed (double).

When both of the clutches 42 and 43 are disengaged, the front wheels are not driven, and therefore the rear wheel drive mode (2WD) is used. Therefore, if one of the driving forms is selected by the changeover switch 38 during steering turning, the steering wheel steering switch 44 by the steering wheel and the one side brake switch 4 by one side brake (steering brake).
The selected turning is carried out by turning ON 5 or the like.

[Brief description of drawings]

 The figure shows an embodiment of the invention.

FIG. 1 is a rear cross-sectional view of a main part.

FIG. 2 is a side view thereof.

FIG. 3 is a side sectional view of a front wheel drive unit.

FIG. 4 is a block diagram of switches and hydraulic pressure.

FIG. 5 is a side view of a part of the tractor.

[Explanation of symbols]

 1 Lift arm 2 Arm axis 3 Airframe 4 Mounting stay 5 Guide edge 6 Lift arm sensor

Claims (1)

Claims: 1. A guide formed in a semi-circular arc around the arm shaft 2 on a mounting stay 4 fixed to the machine body 3 outside the arm shaft 2 of the lift arm 1 that rotates up and down. A lift arm angle sensor for a tractor, which is provided with a lift arm sensor 6 for detecting the rotation angle of the arm shaft 2 fitted and guided on the edge 5 so as to be positionally adjustable around the axis of the arm shaft 2.