JPH0441780Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a three-point hitch device for an agricultural work vehicle for mounting various types of work equipment on the work vehicle.

Prior Art For example, Corona Co., Ltd. developed a work equipment mounting device for various agricultural tasks by connecting a work machine to the front of a work vehicle so that it can be freely adjusted up and down.
As described on page 373 of the "Revised Agricultural Machinery Handbook" published on November 30th, a three-point hitch device consisting of one upper link and two lower links has been widely used.

In this conventional three-point hitch device,
A lift arm, whose one end is pivotally connected to the work vehicle, and a pair of left and right lower links, whose ends are pivotally connected to the work vehicle and work equipment, respectively, are connected by a single lifting rod, and the work vehicle and the lift are connected by a single lifting rod. The arm is connected by a hydraulic cylinder, and the working machine can be freely adjusted up and down relative to the working vehicle by the hydraulic operation of the hydraulic cylinder.

Problems to be Solved by the Invention However, in the conventional three-point link hitch device, the lower link is connected to the lift arm by a lifting rod, so the work machine has difficulty adapting to the undulations and unevenness of the ground surface. If the work equipment cannot move up and down, the work equipment may float or push up, making the running position unstable and causing safety hazards, and there is a high risk that the lifting rod may bend or the three-point hitch device may be damaged. Ta.

In view of the shortcomings of the conventional three-point hitch device, the present invention allows the work equipment to move up and down freely to adapt to the undulations and irregularities of the ground surface, and also allows the work equipment to move up and down in accordance with the undulations and unevenness of the ground surface. By appropriately controlling the
It is intended to provide good maneuverability in driving and ensure safety in driving.

Means for Solving the Problems In order to solve the above problems, the present invention configures a three-point hitch device for a working vehicle as follows. That is, the working machine is attached to the front side of the working vehicle via a three-point link hitch mechanism consisting of one upper link and a pair of left and right lower links. Then, a pair of left and right lift arms and a pair of left and right lower links, each of which is rotatably pivoted at one end, are connected to the work vehicle using a lifting chain equipped with a length adjuster and a tensioning machine equipped with a tension adjuster. It is connected.

Operation The three-point hitch device for the work vehicle configured as described above operates as follows.

That is, the working machine 3 is attached to the working vehicle 1 via the three-point linkage device 2, and the lifting chains 10, 10 are attached in advance.
If the length of the work equipment 3 is adjusted using the length adjuster 14 so as to maintain a slight slack even when the work equipment 3 is lowered to the lowest level according to the unevenness of the ground surface A, the work equipment 3 can fit into the recessed part of the ground surface A. Even if the work equipment 3 enters the ground, it does not rise to the surface, and conversely, even if the work equipment 3 runs onto a convex part of the ground surface A, the lifting chain 1
4 is slack, the thrust force is increased by lift arms 8 and 8.
The working machine 3 moves up and down in accordance with the undulations and irregularities of the ground surface A without being affected by the ground surface A. Furthermore, even when the work machine 3 travels on soft ground, the lower links 6, 6 are connected to the lift arms 8, 8 via the tension bombs 16, 16, so that the work machine 3 can be lowered within a lower range. is appropriately regulated, and the gauge wheel 19 of the working machine 3 is prevented from sinking excessively.

Embodiment The present invention will be described with reference to a preferred embodiment shown in the accompanying drawings.

In the drawings, reference numeral 1 denotes a self-propelled multi-wheeled working vehicle, and a working machine 3 is attached to the front side of the working vehicle 1 via a three-point hitch device 2 so as to be movable up and down. The three-point hitch device 2 is rotatably pivoted at one end at an appropriate height position on the front side of the work vehicle 1 and at an appropriate height position at the other end at an appropriate height position on the work implement 3 by means of pivots 5, 5, respectively. one upper link 4,
A pair of left and right lower links 6, 6 whose one end is rotatably connected to the lower front side of the work vehicle 1 and the other end is rotatably connected to the lower position of the work implement 3 by pivots 7, 7, respectively.
On the front side of the work vehicle 1 at a higher position than the upper link 4, there is a pair of left and right lift arms 8, 8 whose rotating base ends are integrally connected by a connecting rod 9.
is pivoted. The pair of left and right lift arms 8, 8 and the pair of left and right lower links 6, 6 are connected to lifting chains 10, 10 by pivots 11, 11, and the lift arms 8, 8 are connected to the piston rod of the hydraulic cylinder 12. It is designed to be raised and lowered by the telescopic operation of 13. The lifting chain 10,1
There is an adjuster 1 in the middle of 0 to adjust the length.
4 (for example turnbuckles).
A turnbuckle 15 is also provided in the middle of the upper link 4 to adjust its length. Moreover, tension ammunition 16, 16 is connected between the pair of left and right lift arms 8, 8 and the pair of left and right lower links 6, 6 by pivots 17, 17, respectively, and one end of the tension ammunition 16, 16 are equipped with tension regulators (for example turnbuckles) 18,18. The tension bombs 16, 16 have a tension that restricts the lowering of the work implement 3 within an appropriate range, and the tension can be adjusted by tension adjusters 18, 18. Reference numeral 19 denotes a gauge wheel of the working machine 3, which rolls while touching the ground surface A when the working machine 3 is running. 20 is a loading platform installed at the rear of the work vehicle 1.

Note that although the illustrated working machine 3 is a corn harvester, various types of working machines may be used to attach to the working vehicle 1.

Effects of the present invention In short, the present invention has the above-mentioned technical means, so the work machine can be connected to the front side of the work vehicle via a three-point link hitch mechanism consisting of one upper link and a pair of left and right lower links. If the length of the lifting chains 10, 10 is adjusted in advance using the length adjuster 14 to match the size of the unevenness on the ground surface A, then the gauge wheel 19 can be adjusted to fit the concave portion of the ground surface A. Even when the work machine 3 enters the ground, the work machine 3 does not float up in a suspended state, and can be made to run while following the ground surface A. Furthermore, even if the cage wheel 19 rides on a convex part of the ground surface A, the connecting chains 10, 10
is slackened by that amount, and it is possible to prevent thrusting force from being applied to the lift arms 8, 8. Furthermore, since the descending range of the working machine 3 is appropriately regulated by the tension bombs 16, 16, even when traveling on soft ground, the gauge wheel 19 is prevented from sinking excessively, and the working machine 3 is prevented from sinking excessively. It is possible to maintain the running posture of No. 3 appropriately.

Therefore, according to the present invention, even if the ground surface A has large and small irregularities, or even on soft ground, the running posture of the work implement 3 can be stabilized and work can be performed properly at all times. This has the effect of improving driving maneuverability and ensuring driving safety.

[Brief explanation of the drawing]

The drawing shows one embodiment of a three-point hitch device for a working vehicle according to the present invention, and shows the first embodiment of the three-point hitch device for a working vehicle according to the present invention.
The figure is a side view of the whole, and FIG. 2 is a partially enlarged perspective view. 1... Work vehicle, 2... Three-point link hitch device,
3... Work equipment, 4... Upper link, 6, 6... Lower link, 8, 8... Lift arm, 10, 10
...Elevating chain, 14...Length adjuster, 16,16...
...Tension bullet machine, 18...Tension force regulator.

Claims (1)

[Scope of utility model registration request] A working machine is attached to the front side of the working vehicle via a three-point link hitch mechanism consisting of one upper link and a pair of left and right lower links, and a pair of left and right lifts are rotatably pivoted at one end to the working vehicle. A three-point link hitch device for a working vehicle, characterized in that the arm and the pair of left and right lower links are respectively connected by a lifting chain equipped with a length adjuster and a tension bullet equipped with a tension adjuster.