JPS5831682Y2 - Agricultural tractor drawbar hitch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drawbar hitch for a drawbar for towing a trailer or the like to the rear of an agricultural tractor.

Since the drawbar is used to pull heavy-load working equipment such as trailers and plows, it must be securely fixed to a rigid part of the tractor.

For this reason, it is fixed with bolts to the bottom of the rear axle case, which is fixed to the rear of the transmission case.

As seen in the side view of the conventional drawbar hitch shown in Fig. 8, the drawbar hitch is designed to prevent the drawbar from hitting the bolted part of the hitch bracket for fixing the drawbar hit to the lower surface of the rear axle case. The bolts were tightened at different insertion positions.

For this reason, the width of the drawbar hitch bracket parts has increased, making it impossible to reduce the cost of the parts.

The present invention aims to increase the strength by making the drawbar hitch bracket as small as possible and by making the upper part of the drawbar insertion part the bolt fastening part, thereby concentrating the bolt fastening part.

The conventional drawbar has a round bar shape as shown in Fig. 8,
The drawbar hitch 19 is also semicircular, and the bolts for fastening it to the rear axle case 2 are provided three each on the outside of the semicircular shape of the drawbar hitch, and are made of thick plates to increase strength. The drawbar hitch has become larger,
This led to an increase in weight.

The present invention was devised to eliminate these drawbacks, and the configuration of the present invention will be explained based on the configuration of the embodiment shown in the attached drawings.

Figure 1 is a side view of the rear half of the agricultural tractor.

A rear axle case 2 is fixed to the rear surface of a transmission case 1, and rear axle housings 3 are protruded from both sides of the rear axle case.

A rear axle of a rear wheel 4 is supported by a Noah axle housing 3.

1) Protrude the PTO shaft 15 from the rear surface of the rear axle case 2, and cover the PTO shaft 15 with the PTO shaft cover 14.

A hydraulic case 5 is mounted on the upper surface of the axle case 2, and a lift arm 7 rotatably protrudes from the hydraulic case 5.

The seat 6 is provided at the top of the hydraulic case 5.

A top link hinge 8 is provided protruding from the rear surface of the hydraulic case 5, and a top link 9 is pivotally provided to the top link hinge 8.

The lift link 13, which is pivotally supported from the lift arm 7, pivotally connects the middle part of the lower link 10 to its tip, and the lower link 10 is moved up and down by the movement of the hydraulic piston in the hydraulic case 5 and the rotation of the lift arm 7. be moved.

The drawbar hitch of this invention is this rear axle case 2.
is attached to the bottom of the.

FIG. 2 is an enlarged side view showing the three-point link type work machine mounting device and the drawbar hitch.

Figure 3 is a side view with only the drawbar hit part taken out, Figure 4 is a partially sectional side view of the drawbar hit, Figure 5 is a left side view of Figure 4, and Figure 6 is the bottom view of Figure 4. 7 is a right side view of FIG. 4.

The drawbar hitch includes a hitch bracket 17, a drawbar hitch 19, a lower link hinge 16, and a hitch pin 2.
0 and tightening bolt 18, drawbar hitch 19
The drawbar 12 is inserted into the hole, and the hole position is selected and fixed using the hit pin 20.

The drawbar hitch bracket 17 is an inverted U-shaped plate with bends 17 a and 17 a bent downward at the front and rear ends in the direction of travel, and the front part of the drawbar hitch bracket 17 is inserted into the rear axle case 2 from below. to the bottom of 4
The drawbar-hitch bracket is attached with a real fastening bolt 18, and its rear part protrudes slightly beyond the rear end surface of the rear axle case 2, and the insertion hole 17b of the hitch pin 20 is opened, and the drawbar-hitch bracket is left and right under the drawbar hitch bracket in a U-shape. Drover hitch 19
In a structure in which the drawbar 12 is inserted into the frame formed by the drawbar hitch 19 and the drawbar hitch bracket 17, the drawbar hitch bracket 17 is fastened to the lower surface of the rear axle case 2 from below. Bend 17a of the drawbar hitch bracket 17 before and after the head of the bolt 18.

17a protrudes downward, and the drawbar hitch 19
When the drawbar 12 inserted therein is rotated up and down, the upper surface of the drawbar 12 bends 17a, 17a.
It is configured to be in contact with the

Further, a lower link hinge 16 is welded and fixed to a portion of the rear part of the drawbar hitch bracket 17 that protrudes from the rear end surface of the rear axle case 2.

That is, the bends 17a, 17a have a length that extends beyond the head of the bolt 18, and the fastening bolt 1
It also serves to protect 8's head.

In order to obtain a working space for tightening the fastening bolts 18, the drawbar hitch 19 was shortened, so in order to reinforce this, the lower link hinge 16 was fixed to the hitch bracket 17 in the shape of a box, and the left and right sides of the drawbar were fixed to the hitch bracket 17. It also serves as a steady rest.

Conventionally, the lower link hinge was fixed to the rear surface of the rear axle case, but in the present invention, it is specifically fixed to the drawbar hitch bracket.

16b is a hole into which a lower link hinge is inserted.

Among the holes drilled in the drawbar hitch bracket 17, 17C is a hole for inserting a fastening bolt 18, and 17b
is a hole for inserting a hitch pin, and there is also a hole 16 for inserting a hitch pin 20 at the bottom of the lower link hinge 16.
A is opened.

FIG. 8 is a side view showing a conventional drawbar hitch device.

The conventional lower link hinge 16 is fixed to the rear axle case 2 and is not connected to the drawbar hitch.

Further, the drawbar 12 and the fastening bolt 18 of the drawbar hitch bracket are not located in vertically overlapping positions, and the drawbar hit 19 is wide.

As described above, the present invention has a drawbar hitch bracket that is shaped like an inverted U with its front and rear ends bent downward relative to the direction of travel, and its front part is attached from below to the bottom surface of the rear axle case using fastening bolts. In a structure in which a U-shaped drawbar hit is fixed to the left and right below the drawbar hitch bracket by protruding from the rear end surface of the rear axle case to open a hitch pin insertion hole, the front and rear ends of the drawbar hitch bracket are folded. When attaching the bend to the rear axle case, make it protrude beyond the head of the fastening bolt, so that when the drawbar inserted into the drawbar hitch rotates up and down, the top surface of the drawbar will come into contact with the bend. Since the bends 17a and 17a can be used to reinforce the drawbar hitch bracket in the left-right direction, the bends can also be used to prevent the drawbar 12 from moving in the vertical direction. It also serves to protect the head of No. 18 from being hit by the drawbar.

Furthermore, since the surface of the drawbar hitch bracket serves as the flange for the fastening bolt 18, there is no need to extend the flange for the fastening bolt 18 wide as in the conventional case, so the drawbar hitch bracket 17 can be made narrower and smaller. It was possible to configure it as follows.

[Brief explanation of drawings]

Fig. 1 is a side view of the rear half of an agricultural tractor, Fig. 2 is an enlarged side view showing the three-point link type work equipment mounting device and the drawbar hitch, and Fig. 3 is a side view with only the drawbar hitch section taken out. , FIG. 4 is a partially sectional side view of the drawbar hitch, FIG. 5 is a left side view of FIG. 4, FIG. 6 is a bottom view of FIG. 4, and FIG. 7 is a right side view of FIG. 4. FIG. 8 is a drawing showing a conventional drawbar hitch. 12... Drawbar, 16... Lower link hinge, 17... Drawbar hitch bracket, 18... Fastening bolt, 19...
・Drawbar hitch.

Claims (1)

[Scope of utility model registration request] The drawbar hitch bracket has an inverted U-shape with the front and rear ends bent downward relative to the direction of travel, and its front part is attached from below to the bottom surface of the rear axle case with fastening bolts, and the rear part is attached to the rear end surface of the rear axle case. In a structure in which a U-shaped drawbar hit is fixed to the left and right below the drawbar hitch bracket by opening the insertion hole for the hitch pin, the front and rear ends of the drawbar hitch bracket are bent and attached to the rear axle case. The drawbar is protruded beyond the head of the fastening bolt for mounting the drawbar hitch, and when the drawbar inserted into the drawbar hit is rotated up and down, the top surface of the drawbar comes into contact with the bend. Agricultural tractor drawbar hitch.