JPH0665243B2 - Link mechanism of two-point link rotary cultivator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a link mechanism for restricting the lifting and lowering of a rotary tiller in a two-point link type working machine mounting device mounted on the rear part of a tractor.

(B) Conventional technology Conventionally, it is well known that a two-point link type work equipment mounting device is mounted on the rear part of a tractor. These mounting devices connect a lift arm and a case support with a lift link. In addition, the hitch fixed to the rear of the mission case and the case support are pivotally supported, and the rotary tiller is rotated about the connection point with the hitch by the rotation of the lift arm to raise and lower the rotary tiller. I was doing it.

(C) Problems to be Solved by the Invention As in the above-mentioned conventional technique, the hitch and the case support are connected to each other, and the rotary tiller is rotated about the rear end of the hitch by the rotation of the lift arm. When,
There was a problem that the difference between the lower end of the gauge wheel that determines the plowing depth and the lower end of the plowing claws increased as the height increased.

The present invention solves the above problems.

(D) Means for Solving the Problems The present invention is configured as follows in order to solve the above problems.

A top link bracket 23 and a hitch 2 are provided at the upper and lower positions of the rear surface of the tractor mission case 1, the front end of the case support 3 is pivotally supported by the hitch 2 arranged below, and the rear end of the case support 3 is attached to the rotary tiller. The supporting side main beam 17 is fixed to the bevel gear box 5, and the supporting side main beam 17 is projectingly provided on the left and right sides of the bevel gear box 5, and the rotating side main beam 16 is fitted to the supporting side main beam 17. The supported cultivator is the main beam on the rotating side.
In a configuration in which the top link 15 is pivoted around the front end of the top link 15, the top link mast 14 projecting upward from the pivot side main beam 16 is provided with a rear end of the rear link 20. The lower end of the lower link 21 is pivotally supported in the middle of the case support 3, and the rear end of the top link 15, the front end of the rear link 20, and the upper end of the lower link 21 are pinned to each other. Pivot at 22, remove the rear link 20 and the top link 15 in addition to the above state,
The lower link 21 is connected between the top link mast 14 and the case support 3 so that the tiller is not rotated.

(E) Embodiment and Action The object of the present invention is as described above, and the structure of the embodiment shown in the accompanying drawings will be described.

Fig. 1 is an overall side view of a tractor equipped with a two-point link type working machine mounting device, Fig. 2 is a sectional view of a gear box, and Fig. 3 is a rear link 20, a lower link 21, a hitch 2, a top link 15, etc. Fig. 4 is a side view showing the ascending locus of the rotary tiller when connected to Fig. 4, Fig. 4 is a side view of the two-point link work implement mounting device and rotary tiller when the lower link 21 and the top link mast 14 are connected, The figure is also a perspective view.

The overall configuration will be described with reference to FIG.

Hitch 2 at the rear of the mission case 1 at the rear of the tractor
Is fixed, and the rear end of the hitch 2 and the front end of the case support 3 are pivotally supported by pivot pins 4. A bevel gear box 5 is fixed to the rear end of the case support 3, and a main beam, which will be described later, is horizontally provided in the bevel gear box 5. A gear case 6 is fixed to the left end of the main beam in the traveling direction, and a rotary drive shaft is mounted on the lower end. Reference numeral 7 denotes a rear cover, which provides feedback for automatic plowing depth control. Reference numeral 8 denotes a gauge wheel. When the working depth is manually set, the working depth can be set by rotating the handle 11 at the tip of the adjusting screw 10 pivotally supported in the middle of the depth frame 9. is there.

In the present invention, as the rotary tiller moves up and down, the rotary etc. rotate around the main beam as shown in FIG. 2 so that the rotary tiller can move up and down in a state as parallel to the ground as possible. It is possible to move.

That is, the left and right main beams are divided into a rotating side main beam 16 and a supporting side main beam 17, respectively, and the inside of the supporting side main beam 17 is fixedly mounted on the bevel gear box 5, and is loosely fitted and supported by the supporting side main beam 17. The pipe 18 is fitted to the outside so as to be rotatable.

A top link mast 14 and a rotation side main beam 16 are fixedly provided outside the loose fitting support pipe 18. A side support 27 is fixed to the right end of the rotating side main beam 16, and a gear case 6 is fixed to the left end.

In addition, the inside of the loose fitting support pipe 18 and the bevel gear box 5
Case supports 3 and 3 are fixed between them, a universal joint is installed between the case supports 3 and 3, the lift link 19 and the lower link 21 are pivotally supported in the middle of the case support 3, and the front end is connected to the hitch 2. It is linked.

Next, a link mechanism for moving up and down in parallel will be described with reference to FIG. A lift link 19 is pivotally connected to the tip of a lift arm 12 projecting from a hydraulic case provided at the top of the mission case 1, and the other end of the lift link 19 is pinned to the case support 3 by a pin 13
Further, the pin 13 is also pivotally supported at the lower end of the lower link 21.

The upper end of the lower link 21 has a top link 15 and a rear link 20.
And a pin 22, and the other end of the top link 15 is a top link bracket fixed to the rear end of the mission case 1.
It is linked to 23. The other end of the rear link 20 is pivotally connected to the top link mast 14. Therefore, the lift arm 12
The rotary cultivator R is raised by rotating, but is regulated by the top link 15, the rear link 20, and the lower link 21, and the rotation side main beam 16 and the support side main beam are controlled.
17 rotates, and the rotary tiller R moves up and down in a substantially parallel movement state.

According to the present invention, when the main beam rotates and moves up and down in the state of parallel movement as described above, the gauge wheel 8 and the tiller part move differently. Therefore, the gauge wheel 8 supports the rotary tiller. It becomes impossible to control the working depth in this state.

Therefore, in the work for setting the working depth with the gauge wheel, it is necessary to rotate around the rear end of the hitch 2 as in the conventional case.

That is, as shown in FIGS. 4 and 5, the top link 15 and the rear link 20 are removed, and the lower link 21 is rotated to pivotally connect to the upper end of the top link mast 14. Therefore, the case support 3 and the top link mast 14 are fixed, the gauge wheel and the rotary move in the same manner, and the plowing depth control is performed as in the conventional case.

(F) Effects of the Invention With the above-described structure and operation, the present invention has the following effects.

First, the top link 15, the back link 20, and the bottom link 21.
Is connected by a pin 22 so that the rotating main beam 16 and the tiller can be rotated with respect to the supporting main beam 17, and the rotary tiller is moved up and down in parallel to move the rotary tiller to the ground. Since the vertical position of the lower end of the gauge wheel 8 and the lower end of the tilling claws does not change so much in a state substantially parallel to, it is possible to perform highly accurate plowing depth control when the rear cover is used as a sensor. is there.

Secondly, like the existing two-point link type work equipment mounting device,
It is better to fix the rotating main beam 16 so that it does not rotate, rotate it around the rear end of the hitch, and use the gauge wheel to control the working depth. By removing from the rear link 20 and the top link 15 and connecting with the top link mast 14,
It is possible to switch between the rotation-side main beam 16 and the support-side main beam 17 so that they cannot rotate.

According to the present invention, it is possible to perform two types of raising and lowering, that is, the parallel movement raising and lowering and the raising and lowering around the rear end of the hitch, and the working range is widened.

[Brief description of drawings]

Fig. 1 is an overall side view of a tractor equipped with a two-point link type work implement mounting device, Fig. 2 is a sectional view of a gear box part, and Fig. 3 is connected to a rear link 20, a lower link 21, a hitch, a top link, etc. Fig. 4 is a side view showing the ascending trajectory of the rotary cultivator in the case of the above, Fig. 4 is a side view of the two-point link type working machine mounting device and the rotary cultivator when the lower link 21 and the top link mast are connected, and Fig. 5 is the same. It is a perspective view. 2 …… Hitch 3 …… Case support 14 …… Screw support 15 …… Top link 16 …… Rotating main beam 17 …… Supporting main beam 20 …… Rear link 21 …… Lower link

Claims (1)

[Claims] 1. A top link bracket 23 and a hitch 2 are provided above and below the rear surface of the tractor mission case 1,
The front end of the case support 3 is pivotally supported by the hitch 2 arranged below, the rear end of the case support 3 is fixed to the bevel gear box 5 of the rotary tiller, and the supporting main beam 17 is projected to the left and right of the bevel gear box 5. In the configuration in which the rotation-side main beam 16 is fitted to the support-side main beam 17 and the tilling part supported by the rotation-side main beam 16 is rotated around the rotation-side main beam 16, The front end of the top link 15 is pivotally supported by the top link bracket 23, and the rear end of the rear link 20 is pivotally supported by the upper end of the top link mast 14 projecting upward from the main beam 16 on the rotating side. The lower end of the lower link 21 is pivotally supported midway, and the rear end of the top link 15, the front end of the rear link 20, and the upper end of the lower link 21 are pivotally connected to each other by a pin 22, Besides the above Link 20 and the top link
A link mechanism for a two-point-link rotary tiller, characterized in that the lower link 21 is connected between the top link mast 14 and the case support 3 by removing 15 to replace the tiller without rotating.