JPS5915848Y2 - Traction device for traveling work vehicles - Google Patents

Description

[Detailed description of the invention] This invention relates to a traction device for a traveling work vehicle.
When a fertilizer tank trailer, wagon trailer, pest control machine, etc. is towed and connected to a traveling work vehicle, even if the trailer falls into an obstacle such as a mud pit or a ditch, the lifting device installed on the work vehicle can be used to raise the trailer. Not only is it extremely easy to escape by traveling while being lifted up by lifting force, but when a tilling machine such as a plow or rotary is connected to a working vehicle with a three-point linkage mechanism and lifted up, the tilling machine can be lifted from the ground. The purpose is to make it possible to ascend to high and high levels.

In order to achieve such an object, the present invention provides a work vehicle equipped with a work equipment lifting device and a three-point link mechanism on the vehicle body, in which a traction rod is pivotally attached to the vehicle body in the lifting direction, and a towed rod is connected to the traction rod. The top link of the three-point link mechanism is provided with a section for pivoting in the swing direction, the top link of the three-point link mechanism is a telescopic cylinder, and the section for attaching and detaching the link is provided on the traction rod. It is.

Hereinafter, specific examples of the present invention will be described in detail according to the drawings.

Figures 1 to 4 show a case where a tank trailer is towed by a traveling work vehicle, and Figure 5 shows a case where a rotary tilling device is connected to a traveling work vehicle. , 1 is a traveling work vehicle shown as a wheeled tractor, 2 is a rear wheel, and 3 is a transmission case, which is the structure of the vehicle body.

Reference numeral 4 denotes a hydraulic work equipment lifting device, which is provided on the vehicle body 3 and has a pair of left and right lift arms 5.

Reference numeral 6 denotes a top link mounting base, which is provided at the upper center of the rear part of the vehicle body 3. A bracket 7 is detachably attached to the base 6 with a pin 8, and the bracket 7 largely protrudes rearward.

9 is a top link, which is a hydraulic telescopic cylinder; in the embodiment, a tube 10 is removably pivoted to the bracket 7 through a pin body 11; a ball joint 13 is provided at the tip of the piston ram 12; The joint 13 is removably pivoted to the traction rod or the top mast by means of a pin body 14.

The top link 9 may be a single-acting or double-acting cylinder, and although not shown, a control valve device for pressure or flow rate control is provided in the middle of the liquid supply oil path to the cylinder, and the lifting Expansion and contraction can be freely adjusted using a control lever provided on the device 4 or a dedicated control lever.

In addition, the top link 9 may pivot the ram 12 to the bracket 7, and the pivot portion of the top link 9 may be attached to the base 6.
It may be a pin 8 insertion hole.

Reference numeral 15 designates a pair of left and right lower links, which are pivotally connected to the vehicle body 3 via a pin body 16, extend rearward, have a ball joint 17 at each extending end, and link the lift arm 5 with the lift rod 18 midway in the longitudinal direction. are connected to each other.

Note that 19 is a check chain.

Reference numeral 20 denotes a traction rod mounting base, which is provided on the vehicle body 3 at the lower part of the PTO device 21. A bracket 22 is pivotally connected to the base 20 with respect to the lifting direction by a horizontal shaft 23, and the bracket 22 has a rear part. It has a bifurcated connecting part 24.

Reference numeral 25 denotes a traction rod, which is detachably connected to the connecting portion 24 of the bracket 22 with a pin body 26 and is swingable in the swing direction.
is formed at the rear.

28 is a towed rod, and the pin body 2 is attached to the connecting portion 27 of the traction rod 25.
It is detachably connected by 9 and is swingable in the swing direction.

30 is a tank trailer, and 31 is its wheels.

Reference numeral 32 denotes a towing receiver, in which a frame 33 extends rearward from both side walls of the vehicle body 3, and the frames 33 are connected by a plate 34 to receive the bracket 22, etc., and 35 indicates each frame 3.
3 and a diagonal member connected to the vehicle body 3.

Reference numeral 36 denotes a top link attachment part, which is formed protrudingly from the upper part of the longitudinal direction of the traction rod 25, and the above-mentioned ball joint 13 is detachably attached to the hole in the attachment part 36 using the pin body 14.

Reference numeral 37 denotes a traction force detector, and as shown in FIGS. 3 and 4, a hole 38 is formed in the bifurcated connecting portion 27 to mount a long pin in the front and back direction for inserting the traction pin body 29. A strain gauge 39 is installed inside the connecting part 27 and is inserted into the spectacle part 28a of the towed rod 28 and connected to the pin body 29, and this strain gauge 39 is connected to the control valve device of the top link 9. 40 is a feedback body.

41 is a rotary tiller, to which the ball joints 17 of the lower link 15 of the three-point link are connected, and the joint 13 of the piston ram 12 of the top link 9 is connected.
is connected to the working vehicle 1 so as to be movable up and down, and is capable of receiving power from the PTO device 21 via the joint shaft 42.

In the specific example of the above configuration, in order to tow the trailer 30, the traction rod 25 is connected to the bracket 22 with the pin body 26,
A towed rod 28 is connected to the traction rod 25 by a pin body 29 so as to be swingable in the swing direction, and the ram 12 of the top link 9 is connected to a mounting portion 36 of the traction rod 25 by a pin body 14.

When the traveling work vehicle 1 travels in such a connected position, the trailer 30
Since the trailer 30 is towed and can be swung by the pin body 29, there is no problem in turning the working vehicle 1.

Here, work vehicle 1 is used to transport harvested products, transport agricultural tools,
It can be used as a carrier for fertilizers, etc.

During such transportation, if the wheels 31 of the trailer 30 encounter an obstacle such as falling into mud or a ditch, the wheels 21 will slip and the rear wheels 2 will slip, making escape impossible or difficult.

At this time, if the operator operates the control valve device to operate the top link 9 in the retracting direction, the traction rod 25 will be raised relative to the mounting base 20, and the trailer 30 will also be lifted thereby, facilitating escape. do.

In the embodiment, a detection body 37 is provided at the connection between the traction rod 25 and the towed rod 28, and when the above situation occurs, the strain gauge 39 is distorted, which causes the feedback body 40 to transmit the displacement to the valve device. , the top link 9 can be automatically reduced, and escape can be automated here.

Of course, after the escape, the strain displacements of the three strain gauges become the set values, so the top link 9 extends and stops at a predetermined position.

Note that the detection body 37 may be provided at the connection portion between the bracket 22 and the traction rod 25.

As shown in FIG. 5, the tilling device 41 is connected to the traveling work vehicle 1 with a three-point link so that it can be raised and lowered to carry out tilling work.
When the traveling work vehicle 1 is turning on a headland or driving on a general road, the tilling device 41 is raised during the work.

At the time of this elevation, in the embodiment, the top link bracket 7
Since the top link 9 protrudes significantly rearward, the axial length of the top link 9 is shorter when installed than when installed on the stand 6, so the lifting height (self) becomes longer compared to when lifting the lift arm 5. .

To lift the tiller 41 further beyond this lifting height, by applying hydraulic pressure to reduce the top link 9, the top mast moves downward and the tiller 41 is lifted further.

The present invention is as described above, and by making the top link telescopic and providing it selectively on the traction rod and the top mast, it is possible for the trailer to escape even if it encounters an obstacle, and the tilling device is more efficient. It is also possible to lift it high.

[Brief explanation of the drawing]

Figure 1 is the overall configuration diagram when towing a trailer, Figure 2 is the
3 is a plan view of FIG. 2, FIG. 4 is a cross-sectional view of the towed rod connecting portion, and FIG. 5 is a diagram of the overall configuration of the tilling device when it is installed. 3...Vehicle body, 4...Lifting device, 9.
・Curved top nonch, 10... Cylinder tube, 12... Curved piston ram, 14... Ball joint, 15... Curved lower link, 25... Traction rod, 27...・Curved connection part, 28・Curved/towed rod, 29...
... Connecting pin body, 3o... curved trailer, 36... top link installation part.

Claims (1)

[Scope of utility model registration request] In a work vehicle equipped with a work equipment lifting device and a three-point link mechanism on the vehicle body, a traction rod is pivotally attached to the vehicle body in the lifting direction, and a towed lever is pivotally attached to the traction lever in the swing direction. A traction device for a traveling working vehicle, characterized in that the top link of the three-point link system is a compressible cylinder, and a section for attaching and detaching the link is provided on a traction rod.