JPH0361409A - Wheel drive device for riding seedling transplanter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wheel drive device specific to a riding seedling transplanter.

(Prior art) In a traveling vehicle body in which all four wheels are driven, when turning with the rear wheel on the center side stopped, if the circumferential speed of the front wheel is made faster than the circumferential speed of the rear wheel, the front wheel It is known that it reduces mud pushing and allows for tighter turns.・Such small-diameter turns are used for U-turns on headlands, and at this time the work equipment is stopped and the load is lightened, so it is difficult to use a tractor. This is done by increasing the speed of the front wheels (patent @5l-
87213), and because the field is deep and the increase in load required for turning far outweighs the reduction in load due to stopping the seedling transplanter, the rear wheels are slowed down (Utility Model No. 87213). -58033, Utility Model 63-61340, Utility Model 63-148525).

(Problems to be Solved by the Invention) The speed reduction device used in the single-ride seedling transplanter is based on two-stage switching, so there is a shock when switching, and the circumferential speed of the front and rear wheels is Because the difference does not match the turning radius, the front wheels are too fast and wear out, and too slow and difficult to turn.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a means for solving the problems described above.
is equipped with an engine 2, a pair of left and right front axles 4, 4 to be steered, and a pair of left and right rear wheels 5, 5. moving device I
! There is a continuously variable transmission 20 between the engine 2 and the rear differential gear 12, and this continuously variable transmission 20 is connected to the steering wheel of the front axles 4, 4. This wheel drive device in a riding seedling planting machine is characterized in that it is connected to front wheels 4, 4 which are steered so that the rotation speed of a rear differential device 112 decreases as the angle increases.

(Operation and Effect) In the riding seedling transplanter configured as described above, the front wheels 4,
When the vehicle body 1 turns by steering the front wheels 4, the front wheels 4,
The continuously variable transmission 20 operates according to the turning angle of 4, and the differential bag from the engine 2 to the rear! [Lower the rotational speed of the power transmitted to 12.

When the traveling vehicle body l turns with a small radius, the center locus of the front shaft 4°4 becomes a circle with a larger diameter than the center locus of the rear wheels 5, 5, and the difference increases as the turning radius becomes smaller. The difference appears as a difference in circumferential speed between the front wheels 4, 4 and the rear wheels 5, 5.

Here, according to the present invention, as described above, the front shafts 4, 4
As the turning angle becomes larger, that is, as the turning radius becomes smaller, the rotation of the rear wheels 5, 5 is further decelerated, so that the relationship between the front and rear axes is maintained well and the vehicle body 1 always runs smoothly. Turn around.

When a riding seedling transplanter turns on a headland, the field is deep and the wheels rotate as if kneading the mud, requiring a large load. Since the engine speed is slowed down and the load is thereby reduced, the engine 2 does not stop.

(Example> Next, embodiments of the present invention will be described with reference to the drawings.

A running vehicle body 1 includes a pair of left and right front axles 4, 4 and a pair of rear wheels 5, 5, which are steered by an engine 2 and a steering wheel 3.
, and a seedling planting device 7 is attached to the rear with a link 6. The rotational power of the engine 2 is changed to a predetermined speed by the transmission 8 and transmitted to the front differential gear 10 by the front wheel drive shaft 9.
The front wheels 4 are divided into left and right by this differential device 1tlO.
．． It is designed to convey the meaning of 4.

A rear wheel drive shaft 11 is provided parallel to the front wheel drive shaft 9, and its rear end is connected to the rear differential bag w12, and both sides of this differential device 12 are connected to the rear wheels 5, 5.

The front wheel drive shaft 9 has hemispherical plates 13.14 whose outer surfaces face each other, and among these plates 13, 1.4, one plate 13 is fixed to the front wheel drive shaft 9, and the other plate 13 is fixed to the front wheel drive shaft 9. The plate 14 is
It is pressed against the plate 13 by a spring 15. A plate 13 is also attached to the rear wheel drive shaft 11. Similar plate 16 in the same position as '14.
17, the plate 16 is fixed to the rear wheel drive shaft 1]-, the plate 17 can be moved axially by a shifter 18, and a belt 19 is fitted in the grooves of the plates 13.14 and 16.17.
The continuously variable transmission 20 is constructed by winding the wires around each other.

There is a large gear 21 at the lower end of the steering wheel 3, and a chino 23 is hung between this and the small gear 22.
There is a heart cam 25 on the shaft 24 of the shifter 1.
The cam follower 26 at the tip of 8 is in contact with this.

A PTO shaft 27 extending rearward from the transmission 8 is connected to the seedling planting device 7 via a propeller shaft 28.

In the riding seedling planting device configured as described above.

After the rotational power of the engine 2 is adjusted to a predetermined rotational speed by a transmission 8, it enters a front differential device 10 through a front wheel drive shaft 9, and rotates the left and right front shafts 4, 4.

On the other hand, the rotation of the plates 13, 1.4 is transmitted to the plate 16°F by the belt 19, and the rear wheel drive shaft 11 turns the rear differential gear 12, which causes the left and right rear wheels 5, 5 to move around the front shaft 4, Rotates at the same circumferential speed as 4. 1. The vehicle is propelled by a moving vehicle.

At this point, turn the steering wheel 3 to steer the front wheels 4°4. The rotation of this steering wheel 3 is the large gear 21
- When the heart cam 25 is rotated by the transmission to the shaft 24 via the chino 23 and small gear 22, the cam follower 26 pushes the shifter 18, the plate 17 is pushed toward the plate 16, the gap between them narrows, and the belt 19 is released. is pushed out. Then, this belt 19 holds the plate 14 against the spring 15 on the driving side.
In this way, the belt 19 has a smaller radius of gyration on the side of the plate 13.14, and vice versa.

Since the turning radius becomes larger on the sides of the plates 16 and 17, the rotation transmitted from the front wheel drive shaft 9 to the rear wheel drive shaft 11 is decelerated. That is, when the steering wheel 3 is operated to turn the traveling vehicle body 1, the rotation of the rear wheels 5, 5 is decelerated in accordance with the turning angle of the front wheels 4°4.

The figure shows only the minimum functionally necessary elements, and various mechanisms will be added in implementation. Although the continuously variable transmission is shown as a belt type, it is not limited to this, and a cone type or a ring cone type may also be used. rear wheel 5
, 5 are provided with individual braking devices, and when the interlining turns, the center-side braking device stops the rotation of the center-side rear shaft 5. It can also be linked to.

[Brief explanation of drawings]

FIG. 1 is a side view of a riding seedling transplanter according to the present invention, and FIG. 2 is a diagram of its transmission mechanism. The symbols in the figure are as follows. 1 Traveling vehicle body 2 Engine 4 Front wheels 5 Rear shaft 10 Differential device 12 Differential device 20 Continuously variable transmission

Claims (1)

[Claims] A running vehicle body 1 includes an engine 2 and a pair of left and right front wheels 4 to be steered.
. A continuously variable transmission 2 is installed between the engine 2 and the rear differential gear 12.
0, and this continuously variable transmission 20 is connected to the front wheels 4, 4 which are steered so that the rotation speed of the rear differential device 12 decreases as the steering angle of the front wheels 4, 4 increases. A wheel drive device for a riding seedling planting machine characterized by the following.