JPH09149703A - Tractor hitch electrical coupler - Google Patents

Abstract

(57) Abstract: When a working machine is connected to a tractor and the fitting connection of the electrical coupler 8 is incorrect, this is detected and the connection is stopped. SOLUTION: A lower link vertically moved by a lift arm and a top hook at an upper end of a hitch 4 connected to a rear end of a top link are scooped up to engage a lower hook arranged at a lower part of the hitch 4. In the tractor hitch for connecting the working machine and fitting and connecting the electric coupler 8, the coupler sensor 10 for detecting the bending of the elastic support 9 for mounting and supporting the electric coupler 8 and stopping the lifting of the lift arm is provided. The configuration of the electrical coupler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor hitch electrical coupler, and when the working machine is not correctly connected, the working machine is temporarily stopped to connect the working machine. It is intended to eliminate the damage of.

[0002]

2. Description of the Related Art In a work machine hitch using a three-point link mechanism composed of a top link, a lower link, etc., by scooping up the work machine side with a top hook at the upper end of the hitch, Due to the lift of the hitch, the working machine tends to descend due to gravity, and the lower hook portion is engaged to automatically connect the working machine. At this time, in a form in which an electric equipment coupler for controlling the working machine is provided between the hitch and the working machine to be fitted and connected, it is necessary to accurately perform fitting of the electric equipment coupler at the same time as the working machine is connected.

However, when the position of the connection between the hitch and the working machine is changed, or the cover or cap is attached to the electric coupler, the electric coupler cannot be fitted accurately, and the electric coupler is not properly fitted. It can also be deformed or damaged by crushing.

[0004]

The present invention is scooped up by a top hook 5 at the upper end of a hitch 4 connected to the rear ends of a lower link 2 and a top link 3 which are vertically moved by a lift arm 1. In a tractor hitch in which a lower hook 6 arranged at a lower portion of the hitch 4 is engaged to connect the working machine 7 and an electric coupler 8 is fitted and connected, a bending of an elastic support body 9 for mounting and supporting the electric coupler 8 is detected. Then, the electrical coupler is provided with the coupler sensor 10 for stopping the lifting of the lift arm 2.

[0005]

When the work implement 7 is connected,
The hitch 4 of the tractor is brought close to the connecting portion on the side of the working machine 7, and the lift arm 1 is raised while the top hook 5 of the hitch 4 is scooped up. When the top hook 5 is lifted, the connecting portion of the working machine 7 tries to rotate around the top hook 5 portion by its own weight, and the lower portion of the connecting portion is brought closer to the lower hook 6 side and engaged, and The electrical coupler 8 between the hitch 4 and the connecting portion of the working machine 7 is also fitted and put in a transmission state.

The electrical coupler 8 in such a hitch 4
If for some reason the two do not fit correctly, the elastic support 9 is pushed and bends, and the coupler sensor 10 detects this bend. The lift arm 1 is stopped from rising or lowered by the detection of the coupler sensor 10. In this way, when the work machine 7 is connected by the hitch 4, the electrical coupler 8
Is not correctly fitted, the coupler sensor 10 detects this and stops the ascending of the hitch 4 to stop the unreasonable coupling action, preventing damage to the electrical component coupler 8 and ensuring safety. Can be planned.

[0007]

EXAMPLE A tractor 11 is a four-wheeled vehicle for traveling and has a pair of left and right rear wheels 12 at a rear portion of a vehicle body. A top link 3 is provided at an upper portion and a lower link 2 is vertically shaken at both left and right lower portions. The lower link 2 and the lift arm 1 which is vertically moved by the expansion and contraction of the hydraulic cylinder are connected by a lift rod 13 so as to be movable. The hitch 4 is formed in an arch shape in a front view, and has an upper end portion connected to the top link 3 and a lower end portion connected to the rear ends of the left and right lower links 2. An upward top hook 5 is formed at the upper end of the hitch 4 so that the mast pin 14 on the working machine 7 side can be picked up and engaged.

Lower hooks 6 are provided at the lower left and right ends of the hitch 4, and hook pins 16 of the working machine frame 15 are provided.
Can be engaged with. 17 is a turning hook that can be turned back and forth,
The hook pin 16 can be engaged. When the hook pin 16 is fitted to the lower hook 6, the rotary hook 17 is automatically pushed open against the spring 18 and, at the same time, the spring 1 is fitted.
Engaged by 8. Further, the engagement with the hook pin 16 can be released by manually opening the rotating hook 17.

The working machine 7 is a rotary tiller in the example shown in the figure. A tiller 19 having tillers arranged in the left-right direction is provided at the lower portion of the frame 15, a mast 20 is provided at the upper portion, and a mast 20 is provided at the rear portion. A tail wheel 21 that can be adjusted up and down with a handle 22 is provided. By picking up the mast pin 14 on the mast 20 by the top hook 5 of the hitch 4,
The lower hook pin 16 is pivoted by the weight of the tilling device 19 so that the lower hook pin 16 is pulled toward the lower hook 6 side, and is engaged and connected.

At the center of the hitch 4, the transmission coupler 2
3 is provided so as to be interlocked with the power takeoff shaft 24 on the tractor 11 side, and can be transmitted by spline fitting with the input shaft 25 interlocked with the cultivating device 19 side. This transmission coupler 23
Can be engaged with and disengaged from the input shaft 25 at the same time when the hitch 4 is connected and disconnected from the working machine 7. An inner coupler 8A of the electrical coupler 8 is provided on one side of the transmission coupler 23 of the hitch 4, and an outer coupler 8B provided opposite to the inner coupler 8A of the work equipment 7 side of the frame 15 on the working machine 7 side. They can be fitted and connected so as to face each other. The elastic support body 9 for mounting and supporting the convex inner coupler 8A of the electric coupler 8 is attached to the hitch 4 with the bolt 26 so that the elastic support body 9 can be bent back and forth by the spring material. 8A is provided facing the front side of
When A contacts the coupler sensor 10 due to the flexure D of the elastic support 9, this limit switch is turned on, and the lift arm 1 is stopped from moving up or is stopped moving down and is controlled to move down. Work together. Note that such an elastic support 9 may be elastically provided by providing a spring between the support 9 and the inner coupler 8A even if the elastic support 9 itself is not made of an elastic body.

Further, the concave outer coupler 8B has a support body 27 attached to a frame 15 which is a cultivating transmission case, and a spring 2 is attached.
8, it is elastically attached via the guide rod 29 and the like. 30 is the cover of the inner coupler 8A, 31 is the outer coupler 8B
Is the cover of. The terminal 3 connected to the inner coupler 8A by the harness 34 and the controller 34 on the tractor 11 main body side
3, the outer coupler 8B is provided with a terminal 36 which is connected to an actuator, a sensor, etc. on the working machine 7 side by a harness 35, and the inner and outer couplers 8A and 8B are fitted to each other to provide opposing terminals. The configuration is such that power is supplied by fitting connection between 33 and 36.

In fitting the electric coupler 8 as described above,
The outer coupler 8 is fitted to the outer circumference of each of the guide rods 29.
The spiral-shaped spring 28 that presses B to the front side has the maximum opening C1 when not fitted with the inner coupler 8A, but is fitted with the inner coupler 8A and the terminals 33 and 36 are in a joined state. When the outer coupler 8B is excessively pressed to bend the elastic support body 9 and the D coupler sensor 10 is turned on, the spring 28 almost eliminates the distance C3.

When the coupler sensor 10 which resists the elasticity of the support 9 is turned on, the electromagnetic control valve 38 is output via the controller 37 to stop the operation of the hydraulic cylinder 39 or discharge the hydraulic pressure of the hydraulic cylinder 39. The lift arm 1 is controlled so as to stop rising or descend. The operation of the lift arm 1 by the coupler sensor 10 as described above is performed while the lift arm 1 is lifted from the lowest position by operating the position lever or the like, and is lifted by the top hook 5 to scoop up the mast pin 14. It is something that can be made. Therefore, the outer coupler 8B is replaced by the inner coupler 8B.
When it is displaced laterally with respect to A, the spring 28 comes into contact with the cover 30 to reach C3 from C1 through C2, and is further deflected against the elasticity of the support body 9 and the coupler sensor 10.
Will be detected (ON). Also, the coupler sensor 1
When 0 is not detected (OFF), the working machine 7 can be raised by operating the position lever or the like.

Reference numeral 40 denotes a lever, which is provided on one side of the pair of left and right rotating hooks 17 and can be operated and rotated against the tension of the spring 18 when the engagement with the hook pin 16 is released. 41 and 42 are caps made of rubber or the like, which are used to separate the terminals 33 and 36 when the electric couplers 8A and 8B are separated when not in use.
It is covered with to prevent dust and water. When the working machine 7 is connected to the tractor 11, the caps 41 and 42 are removed from the electric couplers 8A and 8B. Holding caps 43 and 44 are provided on each of the caps 41 and 42, and are connected to the covers 30 and 31 of the electric couplers 8A and 8B and held so as not to drop. When connecting the working machine 7 with such caps 41 and 42 attached, as shown in FIGS. 6 and 7, the coupler sensor 10 operates to lift the lift arm 1 in the same manner as described above.
Can restrain the rise of.

In FIG. 8, the difference from the above example is that the concave outer coupler 8A of the electric coupler 8 is attached to the hitch 4 side, and the convex inner coupler 8B is provided on the working machine 7 side, and the outer coupler 8A is provided. The switch D of the coupler sensor 10 is turned on and detected by the operation D against the spring 28 of the spring support 28 and the guide rod 2.
9. Therefore, the support body 45 to which the outer coupler 8A is attached may be rigid and not elastically supported.

In FIG. 9, the difference from the above example is that the cap 43 of the outer coupler 8A is provided with a plate contact 46 and the cap 42 of the inner coupler 8B is made to project a pin contact 47 so that these caps 42, 43 are provided. Even when the working machine is connected in a random state, the pin contacts 47 come into contact with the plate contacts 46 to stop the lift arm 1 from rising as shown in FIG. . With this pin contact 47 and plate contact 46, the coupler sensor 10
Is configured. The pin contact 47 is attached to the inner coupler 8B by a spring 48.
It is elastically supported by and is projected from the pin hole 49 of the cap 42 to the front surface. 50 is a harness for this pin contact 47. Reference numeral 51 is a harness for the plate contacts 46, which is provided integrally with the cap 41.

[Brief description of the drawings]

FIG. 1 is a partial plan view of a hitch portion and an enlarged plan view showing the action of the portion.

FIG. 2 is a side view of an electric coupler section.

FIG. 3 is a control flow chart.

FIG. 4 is a perspective view of a hitch portion.

FIG. 5 is a side view of the tractor working machine.

FIG. 6 is a side view showing the operation of the electrical coupler section.

FIG. 7 is a side view showing the operation of the electrical coupler section.

FIG. 8 is a side view of an electric coupler section showing another embodiment.

FIG. 9 is a side view of an electric coupler section showing another embodiment.

[Explanation of symbols]

 1 Lift Arm 2 Lower Link 3 Top Link 4 Hitch 5 Top Hook 6 Lower Hook 7 Working Machine 8 Electrical Coupler 9 Elastic Support 10 Coupler Sensor

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tsune Takahashi 1-Yachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. A lower hook which is scooped up by a top hook 5 at the upper end of a hitch 4 which is connected to the rear ends of a lower link 2 and a top link 3 which are vertically moved by a lift arm 1 and which is arranged below the hitch 4. 6 is engaged and the working machine 7
In the tractor hitch that connects the electric component coupler 8 and the electric component coupler 8, the coupler sensor 10 that detects the bending of the elastic support 9 that mounts and supports the electric component coupler 8 and stops the lifting of the lift arm 2 is provided. Electrical coupler.