JPH0110968Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an agricultural vehicle in which a working device is attached to a vehicle body so as to be able to roll freely, and a braking device for preventing rolling of the working device is provided.

The above-mentioned agricultural vehicles include those that allow the working equipment connected in a free rolling state to follow the ground in the field, and those that detect the relative horizontal inclination angle between the field and the working equipment, and the absolute horizontal inclination angle of the working equipment to control the working equipment. There are some that automatically control the desired left and right tilt angle, and all of them are equipped with a braking device to prevent the working device from rolling unexpectedly when it is not running. For example, in the case of a free rolling system, when the work equipment is lifted to the non-working height when not working, the stoppers provided on the vehicle body and work equipment are brought into contact with each other near the highest position, and the work equipment is brought into contact with the work equipment. The device is brake-locked in a fixed position. For automatic rolling control systems, when the work equipment is lifted, the control mechanism is interlocked to prevent rolling, or the work equipment is controlled to roll to a certain position relative to the vehicle body and then interlocked. It has a built-in braking device.

However, in a contact-type braking device using a stopper, the brake is not applied until the working device reaches the highest position, so when making a U-turn while raising the working device at the edge of a ridge, etc., the working device must be at the highest position. It was unstable until it reached the top, and when making rapid turns, the work equipment could become unstable, which could be dangerous. Also,
When the working device is located at an intermediate height, there is a drawback that braking is not possible. In the case of automatic attitude control systems, even if you want to slightly change the rolling attitude of the working equipment during repair and inspection work with the engine stopped, the rolling attitude of the working equipment may change slightly because the control system is not operating. could not be changed freely.

In view of the above points, it is an object of the present invention to improve the rolling braking structure so that quick braking and posture change in the braking state can be easily performed, and the structure is simple.

A characteristic feature of the present invention is that in the agricultural vehicle described above, the braking device is a friction brake.

The effects of the characteristic configuration of the present invention are as follows. In other words, since a friction type brake is used as the rolling braking device, the working equipment can be rolled and locked at the same time as the braking operation is performed, and the braking state can be maintained even when stopped at an arbitrary height. In addition to this, the sliding effect of the friction brake allows for easy posture changes, which is convenient for inspection and maintenance.

Next, embodiments of the present invention will be described based on the drawings.

As shown in Figure 1, at the rear of the vehicle body 1, three ground floats 2 and 3, which can swing up and down within a certain range using a fulcrum near the rear end, are arranged side by side in four rows. The planting device 4 is connected so as to be movable up and down via a parallel quadruple link mechanism 5 consisting of one top link 5A and a pair of left and right lower links 5B, and the planting device 4 is connected to the parallel quadruple link mechanism 5. The ground float 2 is configured to be able to roll freely around one longitudinal axis P, and the ground float 2 located at the center of the width of the planting device 4 is used as an elevation control sensor that detects changes in ground pressure. Again, the planting device 4 is arranged so that its ground pressure is maintained constant or nearly constant.
Further, the traveling vehicle body 1 includes a pair of left and right driving front wheels 9 and rear wheels 10, a driver's seat 11 in the center, and a steering handle 13 for vehicle direction in front of the driver's seat 11. , a driving unit 12, and a spare seedling stand 14 are arranged to constitute a riding-type rice transplanter.

The connection portion between the link mechanism 5 and the planting device 4 is
As shown in FIG. 2, a pivot boss 15 is fixed to the lower end of the vertical link 5C at the rear of the link mechanism 5, and the planting device 4
A rolling shaft 16 protruding forward from the left and right center portions of P is passed through the boss 15 to
It is pivoted around it so that it can rotate freely. Further, a braking drum 17 is fixed to the rolling shaft 16, and a braking belt 1 wound around the braking drum 17 is fixed to the rolling shaft 16.
8 is fixed to a mounting member 19 protruding from the rear surface of the vertical link 5C, and further, the brake belt 1
8 is linked to an operating lever 23 provided near the driver's seat 11 via a release wire 21,
A friction type braking device 20 is configured to prevent rolling of the planting device 4 from the hand.

The operating lever 23 is operatively connected to a control valve 27 of a hydraulic cylinder 8 that raises and lowers the planting device 4, and is also operatively connected to a planting clutch 24 that connects and disconnects power to the planting device 4. 2
3 is at position 22a, raise the planting device 4, 22
The planting clutch 24 is set to stop at position b and lowered at position 22c, and the planting clutch 24 is set to ``off'' at position 22d and ``engaged'' at position 22e, and further brakes rolling. is set so that it is in the braking state at the 22f position and in the braking release state at the 22g position. Therefore, after completing one stroke of planting, the operation lever 2 is turned on at the headland.
3 to the position 22a and the planting clutch 24 is "disengaged" and the planting device 4 is raised, rolling braking is immediately possible.

FIGS. 3 and 4 show another embodiment, in which, in addition to the braking device 20 configured as described above, the following attitude correction means is provided. That is, the scale arm 25 is fixed to the front end of the pivot shaft 16, and the left and right lower links 5B, 5B are respectively provided with stopper bolts 26, 26 whose heights are adjustable. Even if the planting device 4 is frictionally locked by the braking device 20 while being tilted due to the raising operation, if the planting device 4 is raised to near the upper limit, the balance tilted together with the planting device 4 will be lifted. The shaped arm 25 is brought into contact with one stopper bolt 26 in advance to rotate the pivot shaft 16, and the planting device 4 is forcibly corrected to a posture parallel to the vehicle body 1 while slipping in the braking device 20. be.

In addition, in the embodiment, the braking device 20 is linked to the operating lever 23 which serves as both a planting clutch lever and a lifting lever, but the braking device 20 may also be linked to a dedicated planting clutch lever or a dedicated lifting lever. It is also possible to provide a dedicated control lever for the braking device.

As the braking device 20, in addition to the band brake type, any well-known friction type brake such as a shoe brake type or a disc brake type can be selected and used.

In addition, in the embodiment, a planting device 4 as a working device
We have described a rice transplanter that is equipped with a tiller that can be rolled freely, but this book also applies to agricultural vehicles that are equipped with various working devices that can be rolled freely, such as agricultural tractors that are equipped with a tilling device that can be rolled freely, and reaping harvesters that are equipped with a reaping section that can be rolled freely. Can apply ideas.

[Brief explanation of the drawing]

The drawings show an example of implementation of an agricultural vehicle according to the present invention, in which FIG. 1 is an overall side view, FIG. 2 is a perspective view of a rolling brake device, and FIG. 3 is a side plan view of main parts in another embodiment, and FIG. Figure 4 is its side view. 1... Vehicle body, 4... Working device, 20... Braking device.

Claims (1)

[Scope of utility model registration request] This agricultural vehicle is characterized in that a working device 4 is attached to a vehicle body 1 so as to be able to roll freely, and a braking device 20 is provided to prevent rolling of the working device 4, and the braking device 20 is a friction brake.