JP3131476B2 - Work implement coupling device in a tractor. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work implement connecting device for a tractor in which a hitch frame is connected to a rear portion by a top link and a lower link, and a rotary tiller is detachably mounted on the hitch frame.

[0002]

2. Description of the Related Art Conventionally, in a tractor in which a hitch frame is connected to a rear portion by a top link and a lower link, and a rotary cultivator is detachably mounted on the hitch frame,
For example, the tillage detector of the rotary tiller is attached to the rotary tiller itself, and the vertical angle of the rear cover is detected by a potentiometer or the like, and the detection result is transmitted to the tractor body via a cord. It is already known that when a socket is provided and a work machine is attached to and detached from a hitch frame, the operation is interrupted manually or automatically.

[0003]

In the work implement detecting device of the above-mentioned tractor, the type in which the socket is interrupted by hand when the work implement is attached / detached can be accurately connected. It is troublesome because it must be operated down, and the type that automatically attaches and detaches is easy to operate, but usually the detection current is extremely small (in the unit of mmA), so that poor contact easily occurs and it is not practical. Further, when there are a plurality of sensors, the number of sensors may be as high as eight in some cases, and in such a case, the sensor cannot be used.

[0004]

According to the present invention, a hitch frame is connected to a rear portion by a top link and a lower link, a work machine is detachably mounted on the hitch frame, and a state of the work machine is detected to detect the state of the work machine. In the tractor adapted to transmit to the control device, the hitch frame is positioned on both sides sandwiching the central input shaft in plan view.
And a plurality of detectors for detecting the state of the working machine are mounted at substantially the same height as the gear case of the input shaft, and a detected member of the working machine and a driving member for the plurality of detectors distributed to the left and right. The above-mentioned problem has been solved by interlocking and linking through a transmission member such as a wire or a link.

[0005]

[Function] When the work machine is mounted on the hitch frame, the upper part of the work machine
Various coupling portion of the lower the hooked a lock receiving portion of the hitch frame lifted by tractor lifting device is automatically linked to the engagement pin in the. At this time, the drive unit connected to the front end of the transmission member is brought into contact with the passive unit of the detector in an interlockable manner. Then, the operation of the detected part of the working machine is transmitted to the driving body via the transmission member, and the driving body operates, whereby the passive body of the detector operates and detects, and the detection result is displayed in the hitch frame. The information is transmitted from the plurality of mounted detectors to the control operation section of the apparatus.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. Reference numeral 1 denotes a tractor transmission case, and a top link bracket 2 attached to a lower portion and an upper portion thereof has a top link 3 and a lower link. The lift arm 6 is connected to the lower link 4 via a lift rod, and the PTO shaft 7 is connected via a yoke joint 8 whose front part is supported by the hitch frame 5 and a clutch. And is connected to an input shaft of a rotary tiller 10 serving as a working machine.

[0007] The rotary tiller 10 is provided with a rotary cover 1 for covering the upper surface of the rotation trajectory of a tilling claw mounted on a tilling shaft.
1, the rear ends of which are fixed to the horizontal frame 12, and the rotating rails 13, 13 having an arc shape in a side view are fitted to the guide rollers on the rotary cover 11 so that they can be rotated back and forth.
An upper portion of a rear cover 15 is pivotally mounted on the rear surface of the horizontal frame 12 so as to be vertically rotatable, and a lower portion of a lifting cylinder 17 with an electric motor 16 having an upper end pivotally supported by a top mast 14 is connected to an intermediate portion of the horizontal frame 12. When the electric motor 16 is rotated in the forward and reverse directions, the elevating cylinder 17 expands and contracts, so that the rotating rails 13 rotate back and forth, whereby the rear cover 15 moves up and down in an oblique direction.

A bracket 18 erected on the rear surface of the rear cover 15 is attached to the rear end of the bending link 20 by the rod 2.
1, a pipe frame 24 rotatably connected and extending laterally from a side surface of a gear case 22 having the input shaft.
A plate 24a protrudes from the front surface of the drive arm 25, and a bracket 23 screwed to the plate 24a pivotally supports an intermediate portion of a drive arm 25 serving as a drive member.
The lower end of the bending link 20 is connected to the pipe frame 24 by a wire 27 wound around the pipe frame once only in a loop, and the upper end is pulled backward by a spring 28 and is urged to rotate. When the rear cover 15 turns up and down due to the change, the drive arm 25 turns forward and backward in the front-rear direction.

The lower end connecting member of the inverted U-shaped hitch frame 5 sets the input shaft of the working machine at the center thereof.
The yoke joint 8 is supported by a U-shaped (plan view) bracket 30 fixed at a position , and an L-shaped mounting plate 34 in plan view is fixed to one side of the bracket 30. A tillage depth detector 32 composed of a potentiometer is mounted on the inner surface of the plate 34, and a middle part of the passive arm 33 is attached to the shaft 32a so as to rotate integrally with the lower part thereof. Since the upper bent portion of the passive arm 33 is opposed to the drive arm 25 on the same plane, the upper hook of the hitch frame 5 is connected to the front portion of the top mast 14. When the lower connecting portion is connected by lifting it on the upper end pin, the drive arm 25 is pressed against the rear surface of the passive arm 33 as shown in FIG. During operation, when the rear cover 15 rotates up and down due to a change in tillage depth, the operation causes the drive arm 25 to rotate through the refracting link 20, the rod 21, and the wire 27, and the passive arm 33 to follow the rotation. Therefore, the tillage depth detector 32 detects the amount of rotation of the rear cover 15 .

FIGS. 3 to 5 show a device for detecting the supporting height of the rear cover 15. A receiving member 36 is erected on the horizontal frame 12 and the front surface of the pipe frame 24 extending from the gear case 22 to the other side. A bracket 38 having a front portion bent outwardly is screwed to a plate 37 integrated with the bracket 37, a lower portion of a lifting / lowering drive arm 39 is pivotally attached to the bracket 38 by a fulcrum pin 40, and an upper end is provided with the receiving bracket 36. Are linked to each other via a rod 36a. A height detector 41 corresponding to the elevation drive arm 39 is mounted on the inner side of an L-shaped mounting plate 42 fixed to the other side of the bracket 30. The other passive arm 43 attached to the shaft and having an inverted L-shape in a front view is urged by a spring 45 so as to rotate until the upper portion comes into contact with a stopper 46, and is folded outward at the lower end. The lower part of the lifting drive arm 39 is configured to contact the bent and substantially horizontal portion when the working machine is connected, and the electric motor 16 rotates forward and reverse to extend and retract the lifting cylinder 17. When activated, the rotating rails 13 and 13 rotate back and forth, and accordingly the rear cover 15 moves up and down.
6a moves back and forth, the drive arm 39 for lifting and lowering and the passive arm 43 rotate, and the amount of movement of the rear cover 15 is detected by the height detector 41, and this detection signal is electrically transmitted to the control device of this machine by a code. Is transmitted to

The electric motor 16 is provided on the front surface of a portion of the bracket 38 which is bent outward (the front surface is preferably inclined at about 70 degrees with respect to the front-rear direction). Socket 5 connected to electrical wiring 48
0, and an L-shaped plate 51 (an angle of the front surface with respect to the front-rear direction is set to approximately 70 degrees) protrudes inward on the inner surface of the rectangular tube portion 5a at the lower right side when viewed from the front of the hitch frame 5. And a socket 52 corresponding to the socket 50 is screwed to a protruding portion thereof. The socket 52 has a ring 53 made of a cushioning material such as rubber adhered to a rear surface of the plate body. A two-pole (+-) connection terminal 55, 55 to which an electric wiring 54 connected to a control device of the present machine is connected, and a two-pole (+-) connection terminal The pins 56, 56 are urged to project by springs 57, 57. When the sockets 50, 52 are connected, the ring 53 prevents rainwater from entering the inside.

Further, it is connected to the two detectors 32 and 41.
The wires 27 and the links are located to the left and right across the central input shaft.
It is distributed and covers the outer circumference of the input shaft.
Safety is improved. Furthermore, the drive arm 2
5, the passive arm 33, the tillage detector 32, the drive arm 39 for lifting and lowering, the height detector 41, the passive arm 43, the sockets 50, 52, etc., are provided with a rotary cover in a state where the rotary tiller 10 is connected to the hitch frame 5. Since it is located on the upper surface 11, even if the tilling nail throws the soil during the operation, the soil does not fall down, and it is possible to always accurately transmit and detect the operation amount.

[0013]

According to the present invention, a hitch frame 5 is connected to a rear portion by a top link 3 and a lower link 4, a work machine is detachably mounted on the hitch frame 5, and the state of the work machine is detected to detect the state of the work machine. In the tractor that transmits the center input shaft to the hitch frame 5 in a plan view.
A plurality of detectors for detecting the state of the work machine are mounted at substantially the same height as the gear case 22 of the input shaft, and the plurality of detections distributed to the detected part of the work machine and the left and right. Since the drive member for the detector is interlocked to the drive member via the transmission member such as the wire 27 or the link, when the work machine is attached or detached, the detection result transmission means of the detector can be automatically switched on and off. Further, a detector for detecting the state of the working machine without attaching the working machine as in the prior art, mounted on hitch frame 5, since transmitted to the detector by mechanical means sensing operation of the working machine, the detection result transmission Even if the means is an electric transmission means, there is no need to interrupt the electric transmission means, and no connection failure occurs. Further, a wire 27 or a wire connected to a plurality of detectors is used.
Link is distributed right and left across the central input shaft,
Covers the outer circumference of the input shaft, improving safety for the input shaft
Is what you do .

[Brief description of the drawings]

FIG. 1 is a side view of a tractor having a rotary tiller connected to a rear portion.

FIG. 2 is a side view showing a connection state of a rear cover rotation amount transmission device.

FIG. 3 is a side view of the rear cover moving amount transmission device in a state where the rear cover is at its highest position.

FIG. 4 is a side view of the same lowest state.

FIG. 5 is a side view of the rotary tiller just before connecting to a hitch frame.

6 is a plan elevation view shows the connection state of each interlocking portion.

FIG. 7 is a plan view showing the above-mentioned separated state.

FIG. 8 is a front view of the same.

FIG. 9 is a sectional view of the front and rear sockets.

[Explanation of symbols]

Reference Signs List 5 hitch frame 10 rotary tiller 11 rotary cover 12 horizontal frame 15 rear cover 17 lifting cylinder 25 drive arm 27 wire 28 spring 32 tillage depth detector 33 passive arm 35 spring 39 lifting drive arm 41 height detector 43 passive arm 50 socket 52 socket

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A01B 59/043

Claims (1)

(57) [Claims] 1. A hitch frame 5 is connected to a rear portion by a top link 3 and a lower link 4. A work machine is removably mounted on the hitch frame 5, and a state of the work machine is detected to provide a control device for the machine. In the tractor configured to transmit, the hitch frame 5 is positioned on both sides of the center input shaft in plan view, and
A plurality of detectors for detecting the state of the working machine are mounted at substantially the same height as the gear case 22 of the input shaft, and the detected portion of the working machine and the driving member for the plurality of detectors distributed to the left and right are connected to the wire 27 or A work implement coupling device for a tractor, which is interlocked and connected via a transmission member such as a link.