JPH0563206U - Tractor hitch device - Google Patents

Abstract

(57) [Abstract] [Purpose] A detector that is detachably connected to the rear part of the tractor unit through a hitch frame and has a rear cover that has a rear cover for detecting the working depth, and the amount of rotation is provided on the tractor unit. In order to transmit to the detector, at least from the hitch frame to the detector, the length is expanded and contracted during cultivating work or when moving the cultivating device up and down, and there is little room to accommodate it. The wire is not damaged, is not entangled with the rotating yoke joint, is not caught by the crop during the work, and the water is not accumulated in the wire. [Structure] A cultivating device having a rear cover for detecting a working depth is detachably connected to a rear portion of the tractor main unit via a hitch frame, and at least the amount of rotation thereof is transmitted to a detector provided in the tractor main unit. A wire is transmitted from the hitch frame to the detector. The rear part of the wire is taken out from the hitch frame in a substantially vertical direction to the upper part, and the middle part is crossed at a position higher than the PTO shaft 1a. The part was connected to the detector in a substantially horizontal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tractor hitch device in which a cultivating device is detachably connected to a rear portion of the tractor unit via a hitch frame, and a rotation amount of a rear cover of the cultivating unit is transmitted to a detector of the tractor unit.

[0002]

[Prior Art]

 A tractor with a rear cover that detects the working depth is detachably connected to the rear of the tractor via a hitch frame, and the rotation amount is transmitted from at least the hitch frame to the detector installed on the tractor. The wire is transmitted to the detector.The rear part of the wire is taken out from the hitch frame in a substantially horizontal direction or obliquely upward, and the front part is connected to the detector in a substantially horizontal direction. At least the front part of the wire, rather than the middle part, was placed so as to be almost horizontal in side view.

[0003]

[Problems to be solved by the device]

 As described above, the rear part of the wire is taken out from the hitch frame in a substantially horizontal direction, and the front part is also connected to the detector in a substantially horizontal direction. When lifting up, the rear part of the wire, whose middle part hangs down from the detector part, rises significantly, causing a part where the bending radius becomes extremely small. There was something to do. In addition, since it is close to the rotating yoke joint, it is not only dangerous, but because it is located below, it may be caught by the crop during the work. Furthermore, when water penetrated into the outer wire with the middle part of the wire slackened downward, water was collected in the sagging part in the middle, causing rusting of the inner wire.

[0004]

[Means for Solving the Problems]

 According to the present invention, a hitch frame is attached to the rear part of the tractor via a link, and a cultivating device having a rear cover for detecting the working depth is detachably connected to the hitch frame, and the rotation amount of the rear cover is adjusted. In order to transmit to the detector installed in this machine, at least from the hitch frame to the detector, a wire is transmitted to the detector. The above-mentioned problem was solved by making the section cross above the PTO axis of the tractor and connecting the front section to the detector in a substantially horizontal direction.

[0005]

[Action]

 Tractor When performing plowing work with a tilling device suspended through a hitch frame at the rear of the machine, advance the work by setting the required plowing depth position on the machine side in advance. The amount of soil inside the rear cover changes and the resistance changes the opening of the rear cover. The amount of rotation is transmitted to the detector installed in the tractor, and the tiller is moved up and down by hydraulic pressure until the preset working depth is reached, and automatic control is performed to reach the required working depth. At this time, at least the wire that is transmitted from the hitch frame to the detector is taken out from the hitch frame in a substantially vertical direction to the upper side, and the front part is connected to the detector in a substantially horizontal direction so that the wire is laterally connected. By arranging them in a substantially inverted L-shape, when the tiller is lifted up, the wire only bends gently and the bending radius is small, so that the wire is not damaged. Also, since it is directed almost vertically upward from the hitch frame, it is far from the rotating yoke joint, which is not only safe, but also there is no risk of being caught by crops during work. Furthermore, water does not collect in the middle part of the wire, and even if water enters, it is discharged from the vertical part, so the inner wire will not rust.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. Lower links 2 are axially supported by lower link pins provided on the lower left and right of the rear part of a mission case 1 of an agricultural tractor, and the lower link 2 is provided on the upper left and right of the rear part of the mission case 1. It is connected to the lower link 2 by a pin at the tip of a lift rod 4 which is rotatably supported downward at the tip of a lift arm 3 provided. A top link support 5 that opens rearward is attached to the center of the rear surface of the transmission case 1, and a front portion of the top link 6 is rotatably mounted in a hole at the tip of the top link support 5. The rear end of the link 2 is connected to a hitch frame 7, and a rotary type tiller 9 as a working machine is detachably connected to the hitch frame 7. On the other hand, the PTO shaft 1a projects from the lower center of the rear part of the mission case 1, and the yoke joint 8 transmits power to the cultivating shaft via the gear case 11 and the chain case 10 of the cultivating device 9.

At the rear part of the hitch frame 7, a top mast 12 formed by joining two L-shaped plates in a side view is erected, and the arm of the lower tiller 9 is mounted via the left and right mast stays 13. While supporting, it also forms a fulcrum for the rear electric cylinder 16 and the tail wheel adjustment handle outer cylinder.

On the upper surface of the rotary cover 14 supported by the gear case 11 and the chain case 10, a rotating rail 15 having an arcuate shape in a laterally symmetrical side view is arranged, and the rotating rail 15 is fitted to a guide roller. It is possible to move back and forth along the rotary cover 14 by being guided, and a horizontal frame 17a pivotally attached to the upper end of the rear cover 17 is fixed to the rear ends of the horizontal frame 17a. A pin is rotatably connected to the lower end of the electric cylinder 16. A bracket 18 which is erected on the left side of the upper surface of the rear cover 17 is connected to a link 23 via a rod 19, a link 20 and a wire 21, and the link 23 is an input shaft fixed to the front surface of the gear case 11. The right side surface of the cover 22 is pivotally supported by a pin 22a.

A roller that pivotally attaches the intermediate portion of the link arm 26 to the lower portion of the bracket 25 fixed to the right side surface of the transmission bracket 7 a at the center of the hitch frame 7 by a pin, and rotates the tip end of the link arm 26. 27 is attached, the other end is connected to the rear end of the inner of the wire 28 connected to the tilling depth detection sensor 29 mounted on the left side surface of the front mission case, and the roller 27 is connected to the upper part by the return spring 24. The upper front surface of the link 23, which is urged to move forward, is brought into contact with the upper side of the mounting plate 25a provided on the bracket 25. Is supported by being screwed so that it can be moved forward and backward, and the lower end serves as a stopper that receives the upper surface of the front part of the link arm 26. At that time, the wire 28 is used for detecting the working depth. The outer arm is adjusted so that the link arm 26 can be received by the stopper while the sensor arm 38 of the sensor 29 is pulled most forward by the spring 39. This adjustment was performed before mounting the tiller 9, and this was used as the detection starting end point of the cultivation depth detecting sensor 29. Further, the length of the wire 21 is adjusted by the nut of the outer stopper so that the link 23 comes into contact with the roller 27 of the link arm 26 in the starting end value posture with the turning rail in the frontmost position. ..

The wire 28 is taken out from the hitch frame 7 obliquely upward in a substantially vertical shape, extends over the top link 6 beyond the center line of the machine body, and extends forward in a substantially horizontal direction. It is connected substantially horizontally to the sensor arm (pulled forward by a spring) of the cultivation depth detecting sensor 29 provided on the left side surface of No. 1 and has a substantially inverted L shape in a side view.

The turning rail 15 moves back and forth in an arc shape along the upper surface of the rotary cover 14 as described above, but the amount of movement is to the left of the horizontal frame 15a connecting the rear ends of the turning rail 15. From the provided bracket, the lower part is transmitted to the upper part of a link arm 31 whose lower part is pivotally supported by a bracket 22a on the left side surface of the input shaft cover 22 fixed to the front part of the gear case 11 via a link rod 30.

On the left side surface of the transmission bracket 7a at the center of the hitch frame 7, an intermediate portion of a link arm 31 pivotally urged by a return spring 24 to move rearward is pivotally supported. The roller 34 axially supported on the upper end of the link arm 33 is pressed against the front surface of the link arm 31, and the outer of the wire 35 whose inner end is connected to the lower end of the link arm 31 stands up from the transmission bracket 7. The mounting plate 32 is screwed to the upper end bent portion so that it can be moved forward and backward, and the lower end of the mounting plate 32 serves as a stopper.

The above-mentioned link arm 26 is designed so that the state in which the link arm 33 is in contact with the stopper at the lower end of the mounting plate 32 is the rotation detection starting point of the rotation detection sensor 36 attached to the other side of the mission case. In the same manner as described above, adjustment is made against the tension spring attached to the sensor arm of the rotation detection sensor 36, and the link arm 31 is connected to the hitch frame 7 so that the rotation rail 15 is connected to the link arm 31. The length of the link rod 30 is adjusted so as to contact the roller of the link arm 33 when the rear cover 17 is turned to the rearmost position by the electric cylinder 16 and is in the lowest position where the rear cover 17 is at the lowest position. To do.

The wire 35 is taken out from the hitch frame 7 obliquely upward in a substantially vertical manner, and in symmetry with the plowing depth control wire 28, it passes over the center line of the machine body and passes over the top link 6 to move forward. The tractor is connected substantially horizontally to the rotation detection sensor 36 provided on the right side surface of the mission case 1 of the main body, and has a substantially inverted L shape when viewed from the side.

[0015]

[Effect of the device]

 According to the present invention, as described above, the hitch frame 7 is attached to the rear portion of the tractor main body via a link, and the tiller 9 having the rear cover 17 for detecting the working depth is detachably connected to the hitch frame 7. In order to transmit the rotation amount of the rear cover 17 to the detector provided in the tractor main unit, at least the wire is transmitted from the hitch frame to the detector. To the upper part in the vertical direction, the middle part is crossed at a position above the PTO shaft 1a of the tractor, and the front part is connected to the detector in the substantially horizontal direction, so that the turning radius of the wire expands and contracts. However, there is enough room to allow the deformation, and the wire will not be damaged. Further, since the middle portion does not hang down in a concave shape, the wire does not come into contact with the rotating yoke joint 8, which is not only safe, but also there is no fear of being caught by crops during work. Furthermore, water does not collect in the middle part of the wire, and even if water enters the wire, it is discharged from the vertical part, so the inner wire does not rust.

[Brief description of drawings]

FIG. 1 is a side view in which a cultivator is attached to a tractor.

FIG. 2 is a plan view of the front part of the tiller.

FIG. 3 is a side view of the tilling depth control device.

FIG. 4 is a side view of a turning rail control device.

FIG. 5 is a front view of the front part of the tiller.

FIG. 6 is a front view of a hitch frame.

FIG. 7 is a plan view of a working machine connecting portion.

[Explanation of symbols]

 1 Mission Case 6 Top Link 7 Hitch Frame 9 Tillage Device 11 Gear Case 15 Rotating Rail 17 Rear Cover 20 Link 21 Wire 22 Input Shaft Cover 27 Roller 29 Rolling Depth Detection Sensor 36 Rotation Detection Sensor

Claims (1)

[Scope of utility model registration request] 1. A tractor main body of the tractor is equipped with a hitch frame 7 via a link, and a cultivating device 9 having a rear cover 17 for detecting the working depth is detachably connected to the hitch frame 7.
The amount of rotation of the rear cover 17 is transmitted to a detector provided in the tractor main body by a wire from at least the hitch frame 7 to the detector, and the rear portion of the wire is transmitted from the hitch frame 7 to the detector. A hitch device for a tractor, characterized in that it is taken out in a substantially vertical direction to an upper part, an intermediate part is made to cross at a position above the PTO shaft 1a of the tractor, and a front part is connected to the detector in a substantially horizontal direction.