JPS5834964Y2 - Tractor - Google Patents

Description

[Detailed description of the invention] In the conventional tractor support device, the lower link is shaped like a crank, as shown in Fig. 4, in order to connect the lift rod and the lower link of the three-point link in the same plane as much as possible. Because the lower link was bent, a large moment was applied to the joint between the lower link and the lift rod. The connecting hole of the link was abnormally worn in the vertical direction, causing rattling, and as a result, the part t, where the lower link was bent laterally (to form a crank shape), was unable to pull up the rotating work machine. There was a drawback that would go away.

Therefore, in order to improve the above-mentioned drawbacks, the lower link is formed into a straight line, and the middle part is connected to the lower end of the lift rod suspended from the rear end of the lift arm with a horizontal axis. Since the rod rotates in an inclined plane in which the lower part is deviated outward from the upper part with respect to the lower link, another drawback arises in that the rod is forced to rotate and move up and down.

The purpose of the present invention is to improve the above-mentioned drawbacks, and in a tractor in which a working machine is supported so as to be able to be raised and lowered by a three-point link at the rear of the machine body, the lower link of the three-point link is constructed in a straight line. , a lift rod is suspended from the tip of a lift arm that extends rearward from the rear of the aircraft.
The lower end of the lift rod is provided in the middle of the lower link and viewed from the length direction of the lower link 3,
It is characterized by being connected by a shaft rod to a horizontal bearing 3a which is inclined so that the inner side is lower.

An embodiment of the present invention will be explained with reference to the drawings. Reference numeral 1 denotes a tractor body, and a top link 2 with a turnbuckle and a straight lower link 3 are connected to the rear of the tractor to connect an appropriate working machine. .

Reference numeral 4 denotes a lift arm that vibrates up and down by a hydraulic device, and a lift rod 6 is connected to the rear end via a universal joint 5, and the lower link 3
A bearing 3a is provided at a slightly rearward position in the intermediate portion of the bearing 3a, which is inclined so as to be perpendicular to the lift rod 6 in a plane substantially perpendicular to the lateral direction.

Since the lower end of the lift rod 6 is rotatably connected to the bearing 3a by a shaft I, the lower link 3 can be tilted up and down by the lift arm 4 via the lift rod 6. When pressed, the work equipment attached to the rear of the top link 2 and lower link 3 will move up and down, but
At this time, the connecting portion between the lift rod 6 and the lower link 3 rotates without difficulty.

In addition, in order to attach the bearing 3a to the lower link 3 in an inclined manner, as shown in FIGS. 3a and 3b, the lower link 3
A long hole with the same width as the outer diameter of the bearing 3a and long in the vertical direction is provided in the hole, and after inserting the bearing 3a into the long hole with the top and bottom of the bearing 3a in contact with each other in an inclined manner as shown in the figure, the upper and lower blank spaces ( It can be firmly attached by welding the parts (areas surrounded by dotted lines).

As mentioned above, the present invention is a tractor in which a three-point link at the rear of the machine body supports a working machine so that it can be raised and lowered. A lift rod is suspended from the tip of the lift arm, and the lower end of the lift rod is inclined so that the inner side is lower when viewed from the length direction of the lower link 3, which is provided in the middle of the lower link. The conventional lower link is bent into a crank shape at the connecting portion between the lift rod 6 and the lower link 3 when the work machine is raised or lowered by the lift arm 4. It is possible to work smoothly and lightly without causing any twisting phenomenon, and wear of the connecting portion can be significantly reduced.

In addition, even if the above-mentioned connecting part wears out, the lifting amount of the work equipment only decreases by the amount of wear, and does not drop as much as the conventional crank-shaped lower link shown in Fig. 5, allowing accurate lifting and lowering. It can be performed.

Furthermore, the lift rod 6 rotates in relation to the lower link 3 as shown in FIG. is a horizontal bearing 3a that is inclined so that the inner side is lower.
Since it rotates around the shaft rod 7 inserted through the lift rod, it is possible to raise and lower the straight lower link 3 smoothly by rotating it diagonally inward and upward and pulling it up. There is no twisting or other forced mutual rotation at the connecting portion between the lower link 6 and the lower link 3, and it is possible to prevent the rotating portion from being abnormally worn or broken.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the tractor, Fig. 2 a is a plan view of the main parts, Fig. 2 is a rear view of the same, and Fig. 3 a is a lower link. 3 is a rear view of the same as above, FIG. 4a is a plan view of the conventional example, FIG. FIG. 6 is a rear view showing the extent to which the lower link descends when worn. 1... Tractor body, 3... Lower link, 4... Lift arm, 6...
・Lift rod, 3a...Bearing, 7...
・Axle rod.

Claims (1)

[Scope of utility model registration request] In a tractor that supports a working machine so that it can be raised and lowered by a three-point link at the rear of the machine, the lower link 3 of the three-point link is used.
is configured in a straight line, and a lift rod 6 is suspended from the tip of a lift arm 4 extending rearward from the rear of the aircraft body,
The lower end of the lift rod 6 is connected by a shaft rod 7 to a horizontal bearing 3a that is provided in the middle of the lower link 3 and is inclined so that the inner side is lower when viewed from the length direction of the lower link 3. A work implement support device for a tractor, characterized by: