JPH0134564B2 - - 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 a planting section and wheels.

Generally, in a walk-behind rice transplanter, a planting part consisting of a planting rod and a seedling tank has a planting clutch and a planting rod for controlling the left and right reciprocating movement of the planting rod or seedling tank, for example. A safety clutch was installed to allow the planting shaft rotating inside the gearbox to idle if the seedling extraction opening in the front plate became clogged with stones and became overloaded.

Therefore, the rear part of the vehicle body is heavy, and the front-rear balance of the vehicle body is poor, making it difficult to operate the steering wheel. Particularly in unicycles, the front-rear balance of the vehicle body is poor.

Additionally, conventional walk-behind rice transplanters have had problems in that the power transmission mechanism is complicated and the price is high.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a power transmission device for a walk-behind rice transplanter that has good body balance, easy handle operation, and has a simple and compact configuration.

An embodiment of 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.

A chain case 4 extends diagonally rearward from the center of the gearbox 1.
A wheel 5 is attached to the rear end of the vehicle.

An arm 6 extends upward at the attachment part of the chain case 4 to the gearbox 1.
The upper end of the gearbox 1 is pivotally connected to a piston shaft 8 via a connecting rod 7 that passes through the gearbox 1 back and forth, and the expansion and contraction of the piston shaft 8 causes the wheels 5 to move up and down depending on the condition of the field.

Further, from both the left and right sides of the gearbox 1, connecting frames 9, 9 which also serve as transmission cases extend rearward along the float 10 on one side, and a planted portion is formed at the rear of the transmission case 9; , 9 are connected by a planting transmission case 37 to form a planting section, and the connecting frames 9, 9 and the planting transmission case 3
Planting devices 11, 11, . . . are provided in the vicinity of the connecting portions 7.

A lower end of a seedling stand 12 faces near the planting device 11, and a handle 13 is provided along the back side of the seedling stand 12.

A transmission belt V is wound between a drive pulley 3b attached to a drive shaft 3a of the engine 3 and a driven pulley 14a attached to an input shaft 14 of the gearbox 1. A hydraulic pump P is formed at the tip of the input shaft 14. A hydraulic cylinder 18 is connected to the hydraulic pump P via a valve 17, and the hydraulic cylinder 18 is formed integrally with the gear box 1.

The piston shaft 8 is slidably inserted into the hydraulic cylinder 18. The valve 17
is connected to the front part of the float 10 via the connecting rod 17a, and the valve 17 is connected to the front part of the float 10 via the connecting rod 17a.
is switched.

A planting side drive shaft 15 for operating the planting section is arranged in parallel to the input shaft 14, and a running shaft 16 for driving the wheels 5 is arranged in parallel to this planting side drive shaft 15.

The input shaft 14 has a small gear go and a lever L.
A plant spacing adjustment driven gear _g1 that slides left and right is attached to the pinion go, and a plant spacing adjustment driven gear _g2 rotatably attached to the end of the planting shaft 15 is provided to the small gear go. An intermediate gear g ₃ is provided adjacent to the adjustment driven gear g ₂ . A large gear g ₄ fixed to the running shaft 16 meshes with the small diameter portion of the intermediate gear g ₃ , and teeth of a clutch member 20 that slides left and right by the teeth on the side of the large gear g ₄ and the lever 19 are engaged. The traveling clutch is turned on and off by contacting and separating from the
This clutch member 20 is biased toward the large gear _g4 by a spring 21. Then, the traveling shaft 16
A sprocket 22 is attached to the opposite end of the
This rotation of sprocket 22 is transmitted to wheel 5 via chain 23. Note that the lever 19 is operated by external operation.

A pawl is provided on the side surface of the interplant adjustment driven gear _g2 , and a pawl of the clutch member 24 splined to the planting side drive shaft 15 is provided in correspondence with the pawl, and the meshing of these pawls allows the planting to be performed. The side drive shaft rotates.

The clutch member 24 is urged toward the stock spacing adjustment driven gear _g2 by a spring 25, and this clutch member 24 slides left and right by a pin 26 that is operated in and out from the outside, and this pin 26 and the clutch member 24
The clutch is disengaged when the planting shaft 15 reaches a predetermined angular position due to the cam action with the circumferential surface of the planting shaft 15. Therefore, the plant spacing adjustment driven gear _g2 and the clutch member 24 form a fixed position stopping clutch mechanism B, whereby the planting device 11 is always stopped at a fixed position.

Further, a sprocket 27 is attached to the end of the planting side drive shaft 15, and this sprocket 27
A disk 28 fixed to the planting side drive shaft 15 is in contact with the side surface of the plant, and the disk 28 and the sprocket 27 are connected by a spring 29. These sprocket 27, disk 28, spring 29, etc. form a safety clutch C of the planting device 11, and the planting device 11 is connected to the seedling extraction openings O, O...O formed in the front plate 12a for some reason. This prevents the planting device 11 from being damaged due to the planting side drive shaft 15 spinning idly when the plant is clogged inside.

A chain 32 is wound between the sprocket 27 and the sprocket 31 of the planting shaft 30, and the rotation of the planting shaft 30 is further transmitted to the seedling stand drive shaft 34 through the chain 33. The guide member 35 is screwed together, and the movement of the guide member 35 from side to side reciprocates the seedling stand 12 from side to side via the connecting rod 36. The rotation of this drive shaft 34 is then transmitted to the planting rod drive shaft 30 on the opposite side.

In this invention, the main gearbox 1, the left and right connecting frames 9, 9, and the planting transmission case 37 are framed in a loop shape in plan view, and the central part is formed into a hollow A, and the running wheels 5 are placed inside the hollow A. Although it has a strong framework structure installed in the main gearbox 1 on the front side, excluding the input shaft 14, there are two shafts, the planting side drive shaft 15 and the running shaft 16, that connect the planting part side and the driving shaft 16. In addition to being able to drive the traveling section, each shaft can be equipped with a planting plant adjustment mechanism, a fixed position stopping mechanism for the planting device 11, a safety clutch mechanism, and a clutch mechanism for the traveling section, making the configuration extremely simple. Since the rear transmission on the planting section side can be simplified, the weight of the rear transmission mechanism can be reduced, and a walking-type rice transplanter with good front-rear balance can be created.

[Brief explanation of drawings]

Fig. 1 is a side view of the walking rice transplanter of the present invention;
The figure is a plan view of the same, and FIG. 3 is a partial cross-sectional view of the power transmission device. 1...Gearbox, 3...Engine, 4...
Chain case, 7... Connecting rod, 8... Piston shaft, 14... Input shaft, 15... Planting side drive shaft, 1
6... Traveling shaft, 24... Clutch member, 27...
Sprocket, 28...disk, 34...seedling stand drive shaft.

Claims (1)

[Claims] 1. An engine 3 is disposed at the front of the gearbox 1, and power is transmitted from the engine 3 to a transmission mechanism in the gearbox 1 via an input shaft 14, and a planted transmission is provided far from the left and right sides of the gearbox 1 to the rear. The case 37 side is connected by the connecting frames 9, 9, and the gear box 1, the connecting frames 9, 9, and the planted transmission case 3 are connected.
7 to form a hollow part A in plan view,
On the side of the planting transmission case 37, a seedling planting device 11 is provided at the connecting portion with the left and right connecting frames 9, 9, and a seedling mounting stand 12 is provided at the connecting portion of the left and right connecting frames 9, 9.
A seedling stand drive shaft 34 is provided to reciprocate from side to side.
Inside the gearbox 1, there is a plant spacing _adjustment driven gear g2 that is transmitted from the input shaft 14 side via a plant spacing adjustment transmission mechanism, and a planting side that is driven from this gear _g2 via a fixed position stop clutch mechanism B. A drive shaft 15, a large reduction gear _G4 which is rotated at a reduced speed through an intermediate gear G3 loosely attached to the drive shaft ₁₅ , and a running shaft 16 which is driven through a clutch member 20 are provided. The drive shaft 15 is provided with a transmission wheel that is driven by a safety clutch C that cuts off the transmission when an overload occurs on the seedling planting device side. A power transmission device for a walk-behind rice transplanter, in which a transmission sprocket 22 of a transmission chain case 4, which transmits power to the seedling planting device side and supports wheels 5 positioned in the hollow portion A, is attached to the traveling shaft 16.