JPH0451808A - Rice 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] (Industrial Application Field) This invention is used for a riding rice transplanter, which improves the straightness of the traveling vehicle body during seedling planting work in paddy fields, and allows the traveling vehicle body to move into the headland. When turning (U-turn), improve turning performance,
Furthermore, the objective is to improve the running performance when the running vehicle body is operated on hard roads.

(Prior Art) A four-wheel drive is used for a traveling vehicle body used in a rice transplanter because the wheels rotate in muddy soil and have a large resistance. A differential device (differential) and a dog clutch (side clutch) are provided between the left and right wheels. The differential gear is equipped with a locking device (differential lock), and depending on the situation, the differential gear can be used to differentially drive the left and right wheels, or to stop the differential and allow the left and right wheels to rotate at the same rotation rate.

In addition, there is also a system in which the locking device automatically switches the presence/absence of differential in conjunction with other operations, as disclosed in Japanese Patent Laid-Open No. 53-260.
This method has been proposed in Japanese Patent Application Laid-open No. 58-12826 and other publications.

(Problems to be Solved by the Invention) The present invention goes further and automatically switches the two locking devices into three types of states according to the selection of the rice transplanter's work.
This improves the straight-line performance and turning performance of the rice transplanter, and also improves the driving performance when driving on the road.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a traveling vehicle body 1 having a pair of left and right front wheels 2, 2 and a pair of rear wheels 3, 3, respectively;
A transmission 15 that transmits the rotation of the engine 4 to the front wheels 2.2 and the rear wheels 3.3 by switching between a high road speed and a slow rice planting speed, and A pair of differential devices 22 and 29 with lock devices 28 and 35 provided therebetween, and a seedling planting device 42 mounted on the traveling vehicle body 1, and an operating device 19. of the traveling vehicle body 1 or the seedling planting device 42. 5
When 1 is operated in the state of transplanting seedlings, the differentials of all the differential devices 22 and 29 mentioned above are locked by the lock devices 28 and 35, and when operated in the state of turning on the headland, the differentials of the front wheels 2 and 2 are locked. Only the differentials 22 and 29 of the front wheels are locked by the locking device 28, and when operated while driving on the road, the locking devices 28.35 are not activated and all the differential devices 22, 29 are locked.
．． This rice transplanter is characterized in that the rice transplanter 2 and the rear wheels 3 and 3 are provided so as to be differentially driven.

(Operations and Effects) Since this invention is configured as described above, when this rice transplanter is transplanting seedlings in a paddy field, the transmission is at a slow rice planting speed position and the rotation of the engine 4 is The slow rotation is transmitted to the front wheels 2, 2 and rear wheels 3, 3, and the traveling vehicle body 1 moves forward at a slow working speed. The differential gears 22.29 provided between the left and right front wheels 2, 2 and the rear wheels 3.3 are stopped from differentially moving by respective locking devices 28.35.

In other words, when the rice transplanter is transplanting seedlings in a paddy field, the left and right front wheels 2.2 and the left and right rear wheels 3.3 are always rotating at the same number of rotations. The traveling vehicle body l moves straight without being affected by this, and the rows of transplanted seedlings become straight.

When this rice transplanter reaches the headland of the paddy field, it makes a U-turn.

At this time, the differential gear 22 of the front wheels 2.2 locks the differential with its locking device 28, but the differential gear 29 of the rear wheels 3.3 opens the lock with its locking device 35 and enters the differential state. It is in.

Rice transplanters and tractors completely stop rotating their inner rear wheels at the headland, and turn using the rotation of their outer rear wheels. At this point, the inner rear wheel, which has stopped rotating, is turned sideways by the outer rear wheel, which hollows out the tiller and deepens the headland.

When you turn a rice transplanter with differential front wheels on the headland of a paddy field at this depth, the inner rear wheel will stop and the front wheels will be steered to the stopped side, but the front wheel on the side with less resistance will Only one wheel rotates while the others do not.Also, the front wheels are made with a particularly small diameter and sink all the way into the deep mud, and because they are turned sideways due to the above steering, it is difficult to drive the rear wheels. It may not be possible to turn with force.

According to this invention, even in paddy fields with deep headlands as described above, the left and right front wheels 2.2 are constantly rotating, so while the front wheels 2.2 are scraping the mud, they are faster than the outer rear wheels 3. It turns by exerting great propulsive force.

Furthermore, when a rice transplanter that has climbed from a paddy field onto the road is moved to its next destination using its own blades, its transmission is switched to a higher speed on the road.

Then, the front wheels 2.2 and rear wheels 3.3 are driven by the engine 4 at a high rotational speed, and the traveling vehicle body 1 moves forward at high speed, and the respective locking devices 28.35 unlock the front wheels 2.2 and 3.3.
The rear wheels 3 and 3 are both differentially driven and smoothly steered.

(Example) Next, this invention will be explained in detail.

As shown in the figure, the traveling vehicle body 1 includes a pair of left and right front wheels 2.2 and a rear wheel 3.3 at the front and rear, respectively.

The rotation of the engine 4 is transmitted to the main shaft 6 via the clutch 5. Front and rear small gears 7 and a large gear box 8 are made integrally and attached to the main shaft 6 with splines so as to move back and forth. Reverse gear 9, large gear 10 and small gear 1
1 is made integrally and is rotatably attached to a speed change shaft 12 parallel to the main shaft 6. An intermediate gear 13 is provided on the intermediate shaft 14 and meshes with the reverse gear 9. When the small gear 7 moves to the left end in FIG. 2, it meshes with the intermediate gear 13, and at the intermediate position it meshes with the large gear IO as shown in the figure, and when it moves to the right end, the large gear 8 meshes with the small gear 11. The transmission 15 is now configured.

The gears 7, 8 are moved as described above by the shifter 16, and their positions are transmitted to the control device 18 by the sensor 17. This shifter 16 is moved by an operating lever 19.

The gear 21 fixed to the wheel transmission shaft 20 is the small gear 1 described above.
It meshes with 1. The ring gear 23 of the differential device 22 of the front wheels 2.2 meshes with the bevel gear 24 at the tip of the wheel transmission shaft 20, and a pair of front wheel shafts 25.25 extend left and right from this differential device 22, and each outer end is connected to the The front wheel is different from 2.2. A clutch 26 is attached to the inner end of the right front wheel axle 25 with a spline so that it can be moved by a shifter 27, and when the clutch 26 is moved, it engages or separates from the pawl 22a of the differential device 22, and is connected to a locking device 28. It has become.

The ring gear 30 of the differential device 29 of the rear wheels 3, 3 meshes with the bevel gear 31 of the rear wheel of the wheel transmission shaft 20, and this differential device 2
A pair of rear wheel shafts 32, 32 extend from 9 to the left and right, and their respective outer ends are connected to the rear wheels 3, 3. Left rear wheel axle 3
A clutch 33 is attached to the inner end of the clutch 29 by a spline so that it can be moved by a shifter 34, and its movement causes the differential gear 29 to move.
The locking device 35 is made so that it can be bitten into and released from the claw 29a of the device.

Gears 36 and 37 of different diameters are fixed to the rear end of the main shaft 6, and a high-speed gear 38 that is always meshed with the gear 37 is connected to the speed change shaft 12.
It is rotatably mounted on the

A low speed gear 39 is attached to the speed change shaft 12 with a spline,
It is designed so that it bites into the gear 36 when moving forward and backward, and the pawl on its right side bites the pawl on the left side of the low-speed gear 39.

A PTO shaft 40 extends further behind the speed change shaft 12, and the two can be connected or separated by a working clutch 41.

The seedling planting device 42 includes a gear box 43, a seedling platform 44 that moves from side to side on the gear box 43, and a seedling planting rod 45 that rotates through the lower part of the platform.
A link 47 is provided with a float 46 that slides on the mud surface.
It is attached to the rear of the traveling vehicle body 1. PTO shaft 40
The rotation is introduced to a group of transmission gears in a gear box 43 through a transmission shaft 48, and the seedling mounting stand 44 and seedling planting rod 45 are operated.

Both ends of the cylinder 49 and a piston rod 50 protruding from the cylinder 49 are attached to the traveling vehicle body 1 and the link 47, and when a lever 51 is operated, a valve 52 is actuated to send oil discharged by a pump (not shown) into the cylinder 49. Also, the oil in this cylinder 49 is returned to the tank.

With this operation, the rear end of the link 47 moves up and down and the seedling planting device 42
The rice-planting position is lowered and the non-working position is raised (including the turning position).

A sensor 53 is provided at the tip of the cylinder 49 and is configured to transmit information about the appearance and retraction of the piston rod 50, that is, the up and down movement of the seedling planting device 42, to the control device 18.

Solenoids 54 and 55 are adapted to actuate shifters 27 and 34, respectively, with signals from controller 18.

In this control device 18, the shifter 16 sets the transmission 15 to a slow rice planting speed (the small gear 7 meshes with the large gear 10) by operating the operating lever 19, and the lever 51 operates the valve 52 to move the rice into the cylinder 49. When the oil is returned to the tank (the seedling planting device 42 descends), the respective solenoids 54 and 55
operates the respective shifters 27 and 34, and the clutch 26
．． 33 bites into the claws 22a and 29a, locking device 28°3
The differential gears 22 and 29 are provided so that the front wheels 2, 2 and the rear wheels 3, 3 are not differentially operated by the differential gears 22, 29.

In addition, this control device 18 causes the shifter 16 to set the transmission device 15 to a slow rice planting speed by operating the operating lever 19, and the lever 5
1 operates the valve 52 and the oil discharged by the pump is transferred to the cylinder 4.
9 (the seedling planting device 42 rises), the solenoid 54 stops (locks) the differential by the differential device 22 in the same way as above, and the solenoid 55 moves the shifter 34 to the left from the above state. the clutch 33 to the pawl 29a.
A differential device 29 is provided so as to differentially drive the left and right rear wheels 3, 3 apart from each other.

Furthermore, when the control device 18 sets the transmission 15 to a high road speed (the large gear 8 meshes with the small gear 11) by operating the operating lever 19 and raises the seedling planting device 42 as described above, each Solenoid 54.55 is shifter 27
, 34 to engage the clutch 26.33 with the pawls 22a, 29.
Separated from a, a differential 22.29 is configured to differentially drive the front wheels 2.2 and the rear wheels 3.3.

Note that the state of transplanting seedlings in the paddy field in the rice transplanter is not limited to the lowering of the seedling transplanting device 42 described above, but is also indicated by, for example, turning on and off of the work clutch 41, and instead of information on the top and bottom of the seedling transplanting device 42, Alternatively, information on whether the clutch 41 is on or off may also be transmitted to the control device 18.

Information on the turning of the traveling vehicle body 1 can also be obtained from information on the operation of the steering wheel and information from the left and right brake pedals. Further, instead of the control device, mechanical interlocking may be used.

[Brief explanation of the drawing]

FIG. 1 is a side view of a rice transplanter according to the present invention, FIG. 2 is a layout diagram of its components, and FIG. 3 is a diagram showing combinations of operations. The symbols in the figure are as follows. 1 Traveling vehicle body 2 Front wheel 3 Rear wheel 4 Engine 15 Transmission device 19 Operation lever 22 Differential device 28 Lock device 29 Differential device 35 Lock device 42 Seedling device representative Eihisa Mizuta

Claims (1)

[Claims] A traveling vehicle body 1 has a pair of left and right front wheels 2, 2 and rear wheels 3, 3, and the rotation of the engine 4 is switched between a fast road speed and a slow rice planting speed, and the front wheels 2, 2 and rear wheels 3, 3 are a transmission 15 that transmits information to the left and right front wheels 2, 2, and rear wheels 3;
, a pair of differential devices 22, 29 with lock devices 28, 35 provided between the two, and a seedling planting device 42 mounted on the traveling vehicle body 1, and the operation of the traveling vehicle body 1 or the seedling planting device 42 is provided. When the devices 19 and 51 are operated to the state of transplanting seedlings, the differentials of all the differential devices 22 and 29 are locked to the lock devices 28 and 35.
When the front wheel 2 is locked and operated to turn at the headland, the front wheel 2,
Only the differential of the second differential device 22 is locked by the locking device 28, and when operated to drive on the road, the locking device 28,
A rice transplanter characterized in that all the differential devices 22, 29 are provided to differentially drive the front wheels 2, 2 and the rear wheels 3, 3, respectively, without the operation of the rice transplanter 35.