JPH0134565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device for a walking rice transplanter for transmitting power from an engine to wheels and a planting rod.

Generally, in walk-behind rice transplanters, the hydraulic pump for moving the wheels up and down is separate from the gearbox, or they are integrated, but in this case, the power from the engine is derived from the hydraulic pump. The power is transmitted from the pulley that rotates the drive shaft via a transmission belt to the running shaft that drives the wheels and the planting shaft that operates the planting rod.

Such conventional power transmission devices have the drawbacks of not only a complicated structure but also a high price.

In view of the above, an object of the present invention is to provide a power transmission device for a walking rice transplanter that has a simple structure and is inexpensive.

The present invention will be described below with reference to the drawings.

1 to 3, a gearbox 1 is provided in the center of the walk-behind rice transplanter, an engine stand 2 extends forward from the gearbox 1, and an engine 3 is mounted on the engine stand 2. It is placed.

Chain cases 4, 4 extend diagonally rearward from both left and right sides of the gearbox 1, and wheels 5, 5 are attached to the rear ends of the chain cases 4.

Arms 6, 6 extend upward at the attachment portion of the chain case 4 to the gearbox 1, and the upper ends of the arms 6 are connected to both left and right ends of the balance rod 8 via connecting portions 7, 7.

The center of the balance rod 8 is pivotally connected to a piston shaft 9, and as the piston shaft 9 expands and contracts, the left and right wheels move up and down while maintaining balance according to the condition of the field.

Also, conduction cases 10 extend rearward from the inside of the chain case 4 along the float 11, and a planting rod 12 is attached to the rear of the conduction case 10.
is installed.

A lower end of a seedling tank 13 faces near the planting rod 12, and a handle 14 is provided along the back side of the seedling tank 13.

A transmission belt 16 is wound between a drive pulley 3b attached to a drive shaft 3a of the engine 3 and a driven pulley 15a attached to an input shaft 15 of the gear case 1. A hydraulic pump P is formed at the tip of the input shaft 15, and this hydraulic pump P has a valve 17.
A hydraulic cylinder 18 is connected through the gearbox 1, and this hydraulic cylinder 18 is formed integrally with the gearbox 1.

Then, a piston 1 is placed in the hydraulic cylinder 18.
9 is slidably inserted into the piston 19, and the piston shaft 9 is connected to this piston 19. The valve 17
is connected to the front part of the float 11 via a connecting rod 20, and the valve 17 is switched in accordance with the vertical movement of the float 11.

The rotation of the input shaft 15 is transmitted to the running shaft 21 which drives the wheels 5 via gears go, g ₁ and g ₂ .
The gear _g1 is attached to an intermediate shaft 22, and a sliding gear _g3 is provided on the running shaft ₂₁ opposite to _the gear _g2 . The rotation of the running shaft 21 is controlled, and these two gears g ₂ and g ₃ form a running clutch. Said sliding gear g ₃ is moved by a link 23 which is actuated by a lever 24 attached to the handle 14.

A planting shaft 25 is attached in parallel to the traveling shaft 21, and a gear g ₄ and a spring 26 are attached to this planting shaft 25.
A clutch gear g ₅ is attached to the gear g ₄ side, and these gears g ₄ and g ₅ form a planting clutch. The clutch gear _g5 is pin 27
This pin 27 is controlled by the entry and exit of
is actuated by a lever 28 supported on the handle 14.

A sprocket 29 is attached to the tip of the planting shaft 25, and a chain 32 is wound between the sprocket 29 and the sprocket 31 of the planting rod drive shaft 30, and the rotation of the planting rod drive shaft 30 is controlled by the chain 33. is transmitted to the seedling tank drive shaft 34 through the drive shaft 34, and a guide member 35 is screwed into the drive shaft 34.
This movement of the guide member 35 from side to side causes the seedling tank 13 to reciprocate from side to side via the connecting rod 36.

The rotation of this drive shaft 34 is transmitted to the planting rod drive shaft 30 on the opposite side.

A sprocket 37 is also attached to the end of the running shaft 21, and the rotation of the sprocket 37 is transmitted to the wheel 5 via a chain 38.

In this way, the hydraulic pump P is directly connected to the input shaft 15, the hydraulic pump, the gearbox, and the hydraulic cylinder 18 are integrally formed, and the traveling shaft 21 is provided with a travel clutch, and the planting rod 25 is provided with a planting clutch. If so, the entire transmission mechanism will be consolidated, making it more compact and lower in price. Furthermore, each input shaft 15, traveling shaft 21, and planting rod 25 are connected by gears, and no transmission belt is used, so the movement of each shaft becomes accurate and the entire transmission mechanism becomes simple.

Furthermore, since the traveling clutch and the planting clutch are provided within the gearbox, the planting part side becomes lighter, the longitudinal balance of the vehicle body is improved, and the steering wheel 14 can be operated easily.

As explained above, the present invention operates a hydraulic pump that moves wheels up and down using an input shaft that inputs power from an engine, and this hydraulic pump is used to switch valves that are switched by the up and down movement of a float. The plant has a hydraulic cylinder integrally formed with a gearbox to which pressure oil is supplied in response to the pressure, and a running clutch is provided on the wheel drive running shaft provided in the gearbox, and the planting bar is operated to plant the plants. Since a clutch is provided and the input shaft, traveling shaft, and planting shaft are interlocked by gears, the structure is simple, the price is low, and the front-rear balance of the vehicle body is also good.

[Brief explanation of drawings]

FIG. 1 is a side view of the walk-behind rice transplanter of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a cross-sectional view of the vicinity of the gearbox. 1...Gearbox, 5...Wheel, 6...Arm, 10...Transmission case, 11...Float, 1
2...Planting rod, 15...Input shaft, 16...Transmission belt, 17...Valve, 18...Hydraulic cylinder,
21... Travel axis, 25... Planting axis.

Claims (1)

[Claims] 1 A hydraulic pump that moves the wheels up and down is operated by an input shaft that inputs power from the engine, and pressure oil is supplied to this hydraulic pump in response to switching of a valve that is switched by the vertical movement of a float. It has a hydraulic cylinder integrally formed with the gearbox, and a travel clutch is provided on the travel shaft of the wheel drive provided in the gearbox, and a planting clutch is provided on the planting shaft that operates the planting rod, and these input shafts, travel A power transmission device for a walking rice transplanter, characterized in that a shaft and a planting shaft are interlocked by gears.