JPH0665242B2 - Link mechanism of two-point link rotary cultivator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a link mechanism for restricting a vertical posture of a rotary tiller in a two-point link type working machine mounting apparatus mounted on a tractor.

(B) Conventional technology Conventionally, there has been a two-point link type working machine mounting apparatus mounted on the rear portion of a tractor. As shown in FIG. 6, these mounting devices are pivotally connected to a lift arm, the other end of the lift link is connected to a case support, etc., and the lift arm is rotated, whereby a hitch fixed to the rear part of the tractor and a case support. The rotary cultivator was rotated around the connection point of and moved up and down.

Further, conventionally, as a technique for interposing a lower link between a lower link and a top link, techniques such as Japanese Patent Publication No. 55-24843 and Japanese Patent Publication No. 56-160903 are known. .

(C) Problems to be Solved by the Invention However, in the technique described in Japanese Patent Publication No. 55-24843 and Japanese Patent Publication No. 56-160903, the rotary tiller is moved to the highest position when traveling at the end of the field. When it rises, it suddenly becomes a forward leaning posture, and is configured to exert the action of reducing the turning radius.

The present invention is configured such that the rotary tiller is moved up and down as parallel to the ground as possible in the vicinity of the working height of the rotary tiller.

(D) Means for Solving the Problems In view of the above points, the present invention is configured as follows.

The top ring bracket 4 and the lower link hitch 15 are projectingly arranged on the rear surface of the tractor mission case, and the case support 3 is pivotally connected to the rear end of the lower link hitch 15. In a configuration in which a bevel gearbox 5 is fixedly installed at the end, and a lower end of a lift link 2 pivotally connected to a lift arm 1 is pivotally supported by a pivotal connection portion 6 provided in the middle of the case support 3, A main beam inner cylinder 17 is provided on the left and right sides, a main beam outer cylinder 16 is loosely fitted on the outer periphery of the main beam inner cylinder 17, and a rotary tilling device is fixedly mounted on the main beam outer cylinder 16 A top link mast 14 is provided so as to project above the cylinder 16, a top link 7 is pivotally connected to the rear end of the top link bracket 4, and a rear link 10 is pivotally connected to a pivotal connection portion 9 at the rear end of the top link 7. The rear end of the rear portion link 10 connected to the top of the top link mast 14, the pivot connection part 9
The lower link 11 is interposed between the case support 3 and the middle part of the case support 3.

(E) Embodiments The purpose and structure of the present invention are as described above, and the structure of the present invention will be described based on the structure of the embodiment shown in the accompanying drawings.

FIG. 1 is a side view of a two-point link type working machine mounting device and a rotary tiller, FIG. 2 is a perspective view of the same, and FIG. 3 is a partial cross-sectional view of a two-point link type working device mounting device, and FIG. Is a cross-sectional view of the bevel gear box portion, FIG. 5 is a side view showing the ascending locus of the rotary tiller, and FIG. 6 is a side view showing the ascending trail of the conventional rotary tiller.

The link mechanism of the present invention is for raising and lowering the rotary tiller approximately in parallel within the range of tillage use, and the link mechanism will be described with reference to FIGS. 1, 2, and 3.

A lift arm 1 is projectingly provided on a hydraulic case of a tractor, a tip of the lift arm 1 and a lift link 2 are pivotally connected, and the other end of the lift link 2 is projectingly provided from a side portion of a bevel gear box 5 of a rotary tiller R. The case support 3 is pivotally connected to the middle of the case support 3 and the rotary tiller R is moved up and down by the rotation of the lift arm 1. A top link bracket 4 is fixed to the rear end of the mission case, and a top link 7 is pivotally supported by a pin 8. The other end of the top link 7 is pivotally connected to a rear link 10 and a lower link 11 by means of a pivoting portion 9, and the other end of the rear link 10 is pivotally supported to a bolt 12, which is the upper arm 13 and the top. Link Mast 14 is pivotally supported. The other end of the lower link 11 is pivotally supported inside the case support 3 by a pivot portion 6, and the front end of the case support 3 and a lower link hitch 15 fixed to the rear end of the transmission case of the tractor are pivoted. The rear end of the case support 3 is fixed to the main beam outer cylinder 16 and the pipe 18.

The top link mast 14 is formed in a "ku" shape,
The upper end is pivotally connected to the rear link 10 and the upper arm 13, the central part is fixedly mounted on the bevel gear box 5, and the rear end is bolted.
It is connected to the stay 20 and the depth frame 21 at 19.
A hanger rod 22 is fitted to the rear end of the depth frame 21, and a tail wheel 23 is attached to the lower end of the hanger rod 22.
Further, the middle of the depth frame 21 and the upper end of the stay 20 are connected to an adjusting screw 24, and the height of the tail wheel 23 can be adjusted by rotating a handle 25.

Since these link mechanisms are configured to keep the rotary tiller in parallel as the lower link hitch 15 rotates about the rear end thereof, the rotary etc. rotate around the main beam as shown in FIG. It is possible to move.
That is, the left and right main beams are divided into a main beam outer cylinder 16 and a main beam inner cylinder 17, respectively.
Is fixed to the bevel gear box 5, and the pipe 18 is fitted onto the main beam inner cylinder 17 so as to be rotatable.
A top link mast 14 and a main beam outer cylinder 16 are fixedly provided outside the pipe 18. 26 is a retaining ring. The right end of the main beam outer cylinder 16 is a side support 27.
Is fixed, and the gear case 28 is fixed at the left end. Also,
The case supports 3 and 3 are fixed between the inside of the pipe 18 and the bevel gear box 5, and the universal joint 29 is internally provided between the case supports 3 and 3, and the lift link 2 and the lower link 11 are pivoted in the middle of the case support 3. The lower end is pivotally connected to the lowering hitch 15.

(F) Action With the above-described configuration, the following actions are performed.

That is, as shown in FIG. 5, when the lift arm 1 is rotated, the case support 3 is also rotated via the lift link 2, and the rotation of the case support 3 causes the top link 7 to rotate via the lower link 11. Move. Also the rear link at the same time
Even if 10 regulates the top link mast 14 and the case support 3 rotates, the rotary tiller is loosely fitted between the main beam inner cylinder 17 and the main beam outer cylinder 16 in a rotatable state. Therefore, the forward tilting rotation of the rotary tiller R is restricted, and the posture parallel to the ground is maintained. Therefore,
Within the working range 1, the rotary cultivator can be raised or lowered in parallel.

(G) Structure of the Invention With the structure and operation as described above, the present invention has the following effects.

First, since the movement can be maintained substantially horizontal within the range of use such as tilling work and scraping work, the fluctuations are reduced and the work done by the rotary is improved.

Second, top link 7, rear link 10, and lower link 11
Although it is possible to move parallel to the ground even with only the link mechanism configured by the above, by using a rotary tilling device that rotates integrally with the top link mast 14, the height of further parallel movement can be increased by the working range l. It became possible to make it big.

[Brief description of drawings]

FIG. 1 is a side view of a two-point link type working machine mounting device and a rotary tiller, FIG. 2 is a perspective view of the same, and FIG. 3 is a partial cross-sectional view of a two-point link type working device mounting device, and FIG. Is a cross-sectional view of the bevel gear box portion, FIG. 5 is a side view showing the ascending locus of the rotary tiller, and FIG. 6 is a side view showing the ascending trail of the conventional rotary tiller. 1 …… Lift arm 2 …… Lift link 3 …… Case support 4 …… Bracket 7 …… Top link 10 …… Rear link 11 …… Bottom link 14 …… Top link mast

Claims (1)

[Claims] 1. A tractor mission case is vertically arranged on a rear surface of the tractor to project a top link bracket 4 and a lower link hitch 15, and a case support 3 is pivotally connected to a rear end of the lower link hitch. Bevel gearbox 5 is fixed to the rear end of case support 3, and case support 3
In a structure in which a lower end and a lift link 2 which is pivotally connected to a lift arm 1 are pivotally supported by a pivotal portion 6 provided in the middle of the main beam, a main beam inner cylinder 17 is provided on the left and right of the bevel gear box 5 so as to project from the main body. Main beam outer cylinder on outer circumference of beam inner cylinder 17
16 is loosely fitted, a rotary tilling device is fixedly mounted on the main beam outer cylinder 16, and a top link mast 14 is projecting upward from the main beam outer cylinder 16 to form the top link bracket 4.
The top link 7 is pivotally connected to the rear end of the top link 7, and the rear link 10 is pivotally connected to the pivot connection portion 9 at the rear end of the top link 7.
A two-point link type rotary tiller, characterized in that the rear end of 10 is connected to the upper part of the top link mast 14, and a lower link 11 is interposed between the pivotal connection part 9 and the middle part of the case support 3. Link mechanism.