JPS6223607Y2 - - Google Patents

Description

[Detailed description of the invention] The invention has a hitch structure that is fixed to a mission case equipped with a power take-off shaft that protrudes rearward. A shaft for pivotally holding a pair of left and right links for mounting, a member for pivotally connecting a working device so as to be swingable from side to side, and a mounting portion for a protector covering above the power take-off shaft. Regarding the hitch structure of a tractor.

In the conventional hitch structure, as shown in FIG. 5, the supporting shafts 10, 10 of the links 2, 2 are attached to the mission case 6 via brackets 15, 15, and the members are attached to the brackets 15, 15. 11
A pair of left and right frames 1 that firmly support both left and right ends of
6 and 16 are attached, and the portion of the transmission case 6 that is higher than the power take-off shaft 5 and the frame 16,
A pair of right and left support frames 17, 17 are hung over the middle part of the support frame 16 in the longitudinal direction, and a protector 12 is attached to the pair of support frames 17, 17. ,
Not only is the manufacturing cost high due to the large number of component parts, but it also requires a great deal of effort to assemble into the transmission case, and is also weak in strength.

In view of these circumstances, the present invention aims to reduce costs and improve assembly workability by significantly reducing the number of component parts, and at the same time, aims to increase overall strength.

Next, an embodiment of the present invention will be described based on the drawings. As shown in FIG. As shown in FIG. 2, in a tractor 4 that can be switched between towing a working device 1' such as a trailer so that it can swing left and right via a link 3, a power take-off shaft 5 that protrudes rearward is attached. The hitch 7 for connecting the working device, which is fixed to the provided mission case 6, is constructed as follows.

A pair of left and right bracket members 8, 8, which are formed from a single plate cut into a substantially right triangular shape when viewed from the side, are attached to the rear edge portions of both left and right sides of the mission case 6, with the oblique sides thereof facing rearward and downward. In this posture, bolt 9 at multiple locations above and below on one side of it...
at a position directly below the mounting portion of the bracket members 8, 8 pairs to the transmission case 6,
The shafts 10, 10 for removably pivotally holding the lower links 2, 2 pairs are fixedly supported, and the shafts 10 of the bracket members 8, 8 pairs are fixedly supported.
Both left and right ends of a group of plate-like members 11, which pivotally connect the link 3 so as to be free to swing left and right, are fixedly supported in a portion located rearward of the links 0 and 10. Attachment parts 14, 14 by bolts 13 of the protector 12, which cover the upper part of the power take-off shaft 5, are formed on the oblique sides of the pair of bracket members 8, 8. In the figure, 16 is a reinforcing member that connects both the bracket members 8, 8, and this is in contact with the lower surface of the mission case 6 when the bracket members 8, 8 are attached to the mission case 6. .

Incidentally, the present invention may be implemented by configuring the two shafts 10, 10 as one shaft extending between the two bracket members 8, 8. In this case, the connection strength between the two bracket members 8, 8 can be improved by having the shaft 10.

In summary, the hitch structure of the tractor according to the present invention includes a pair of left and right single-plate bracket members 8, 8, which are triangular or nearly triangular in side view, attached to the transmission case 6 at one side thereof, upper and lower. A pair of left and right links 2, 2 are fixed at a plurality of locations, and a pair of left and right links 2, 2 are provided for vertically swingably mounting the working device at a position directly below or almost directly below the mounting portion of the bracket members 8, 8 pairs to the mission case 6. It supports the shafts 10, 10 for pivoting and holding, and also supports the shafts 10, 10 of the pair of bracket members 8, 8.
Both left and right ends of a member 11 for pivotally connecting the working device so as to be swingable from side to side are fixedly supported at a portion located further rearward than the above-mentioned bracket member 8,
8 is characterized in that a mounting portion 14 for a protector 12 that covers the upper side of the power extraction shaft 5 is provided on the oblique side portion of the power extraction shaft 5.

That is, since the shafts 10, 10, the member 11, and the protector 12 are attached to the mission case 6 via the pair of left and right bracket members 8, 8,
Compared to the conventional structure described above, the number of component parts can be greatly reduced, manufacturing costs can be reduced, and installation workability can be improved. Moreover, the bracket members 8, 8
The pair is triangular or approximately triangular in side view, and the member 11 and the bracket member 8,
By fixing the eight pairs together, we were able to increase the overall strength.

[Brief explanation of the drawing]

The drawings show an embodiment of the hitch structure of the tractor according to the present invention, in which FIG. 1 is a side view showing the state in which the lifting work device is being towed, FIG. 2 is a side view showing the state in which the left-right swinging work device is being towed, and FIG. FIG. 4 is an enlarged exploded perspective view of the main part, and FIG. 5 is a side view of the main part showing a conventional structure. 2, 2... Link, 5... Power take-off shaft, 6... Mission case, 8, 8... Bracket member, 10, 1
0...Axis, 12...Protector.

Claims (1)

[Claims for Utility Model Registration] This is a structure of a hitch constructed by being fixed to a mission case 6 having a power take-off shaft 5 projecting rearward, the power take-off shaft 5 protruding rearwardly. A pair of triangular or nearly triangular left and right single-plate bracket members 8, 8 are fixed at multiple locations above and below on one side thereof, and the mounting portions of the bracket members 8, 8 pair to the mission case 6 are fixed. The pair of bracket members 8, 8 supports shafts 10, 10 for pivotally holding a pair of left and right links 2, 2 for vertically swingably mounting a working device at a position directly below or almost directly below. Both left and right ends of a member 11 for pivotally connecting the working device so as to be swingable from side to side are fixedly supported on the portion located rearward of the shafts 10, 10, and the oblique side portions of the bracket members 8, 8 are fixedly supported. A hitch structure for a tractor, characterized in that a mounting portion 14 of a protector 12 is provided to cover the upper side of the power take-off shaft 5. A hitch structure for a tractor according to claim 1, wherein the pair of left and right bracket members 8, 8 are formed from a die-cut veneer.