JP2000270622A - Planting part transmission gear of rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planting part transmission gear of a rice transplanter capable of making the structures of a torque limiter and a clutch on levee side installed in planting transmission case simple and compact and readily repairing when the gear breaks down. SOLUTION: A claw driving shaft 72 provided in the top part of a transplanting transmission case 8 is interlocked at a speed reduction ratio 2 to an input shaft 92 equipped with the base of the transplanting transmission case 8 by chains and a torque limiter 71 is installed in the input shaft 92 and a constant position-stopping type clutch B on levee side is installed in a claw driving shaft 72 provided with a rotary type seedling transplanting mechanism 9. The clutch B on levee side is constituted so as to carry out clutch off operation at only definite position in circumferential direction of the claw driving shaft 72.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planting portion transmission device for a rice transplanter, and more particularly, to a transmission structure of a planting transmission case portion connected to the end of a feed case for transmission to a seedling planting mechanism. The present invention relates to a fixed position stop type ridge-side clutch that stops the planting claw at the ground floating position, a jump clutch that operates when the driving load exceeds a predetermined value, and a transmission mechanism in the planting transmission case.

[0002]

2. Description of the Related Art For example, when a 6-row rice transplanter is used as a 4-row planting on the right side, at the time of planting one step before ridge planting, fractional planting is performed so as to adjust the number of planting rows to the width of the field. In many cases, the planting transmission case is equipped with a ridge-side clutch that interrupts the power to some seedling planting mechanisms.
In addition, the planting drive system is equipped with a jump clutch (safety clutch) that cuts off the transmission when a drive load exceeding a predetermined level acts on the seedling planting mechanism, etc., to prevent damage to the planting claws and the planting transmission system. (See, for example,
178833).

[0003]

In the above prior art, the input shaft is equipped with the torque limiter and the ridge-side clutch in a state where they are partially used as parts, which is preferable in terms of function integration. However, on the other hand, the structure at the base of the planting transmission case is complicated and has many design restrictions, and it is disadvantageous in terms of ease of repair at the time of failure. An object of the present invention is to provide a structure in which the torque limiter and the ridge-side clutch can be configured simply and compactly by reviewing the transmission structure of the planting transmission case, and which can be easily repaired in the event of a failure. is there.

[0004]

According to a first aspect of the present invention, in a planting portion transmission device of a rice transplanter, an input shaft provided at a base portion of the planting transmission case and a tip portion of the planting transmission case are provided. The jaw drive shaft is decelerated and linked, the input shaft is equipped with a torque limiter, and the jaw drive shaft is equipped with a fixed position stop type ridge-side clutch.

According to a second aspect of the present invention, there is provided a planting portion transmission device for a rice transplanter, wherein a claw drive shaft for driving a rotary-type seedling planting mechanism having a pair of planting claws is provided at a distal end portion of the planting transmission case.
The claw drive shaft is equipped with a fixed position stop type ridge-side clutch, and the input shaft provided at the base of the planting transmission case is equipped with a torque limiter.

According to a third aspect of the present invention, in the second aspect, the pawl drive shaft is interlocked with the input shaft in a decelerating manner, and the ridge-side clutch is operated only at a fixed position in the circumferential direction of the pawl drive shaft. There is a feature.

According to a fourth aspect of the present invention, an input shaft provided at a base portion of a planting transmission case and a pawl drive shaft provided at a distal end portion of the planting transmission case are interlocked by a chain transmission mechanism. Is characterized in that a boss formed with a clutch claw and a sprocket tooth formed by fine blanking are welded and integrated with each other.

According to the structure of the first aspect, the ridge-side clutch is arranged on the claw drive shaft of the input shaft and the claw drive shaft which is closer to the seedling planting mechanism. Compared with the one, the interlocking portion between the input shaft and the claw drive shaft is not interposed, so that the inertia when stopping the seedling planting mechanism is reduced, and the clutch capacity and stop shock can be reduced. The input drive shaft is decelerated and linked with the input shaft, and a torque limiter is installed on the input shaft, which is on the high-speed and low-torque side compared to the input drive shaft, so that the set value of the maximum load torque should be lower than before. And the capacity of the torque limiter can be reduced. Further, since the torque limiter and the ridge-side clutch are separately arranged on two shafts, they are structurally independent, and it is also preferable that the cause of the failure can be easily clarified and repaired.

According to the second aspect of the present invention, the ridge clutch is provided on the claw drive shaft, which is the lower drive side of the planting transmission case, so that the inertia when the seedling planting mechanism is stopped is reduced, and the crank type is formed. The clutch capacity and the stop shock can be reduced while providing a rotary-type seedling planting mechanism having a large rotational inertia as compared with the above-described planting planting mechanism. In addition, since the input shaft is equipped with a torque limiter, the torque limiter and the ridge-side clutch are separately arranged on two shafts, which are structurally independent. It is also preferable that the repair can be easily performed.

According to the third aspect of the present invention, since the pawl drive shaft is decelerated and linked to the input shaft, a torque limiter is provided on the input shaft which is on a higher speed and lower torque side than the pawl drive shaft. The set value can be made lower than before, and it becomes possible to reduce the torque limiter capacity of the one provided with the rotary type seedling planting mechanism. or,
In the rotary type, it is theoretically possible to provide two stop positions for a pair of planting claws at 180 degrees apart per rotation of the pawl drive shaft, and a notch for entering the clutch shifter in the clutch rotating body of the ridge-side clutch. Can be realized by forming two places in the circumferential direction.

However, according to the present invention, the ridge-side clutch can be disengaged only at a fixed position in the circumferential direction of the pawl drive shaft. 1 in direction
Since it is sufficient to form only a portion, it is possible to increase the strength and reduce the size of the clutch rotating body while providing a fixed position stopping function, as compared with a case where two notches are formed.

According to the fourth aspect of the present invention, the sprocket of the chain mechanism housed in the planting transmission case is welded and integrated with the boss on which the clutch pawl is formed and the sprocket teeth formed by fine blanking. With this configuration, it is possible to follow a rational structure that also functions as a clutch such as a shoreside clutch, and it is possible to reduce the cost and weight while having the necessary functions as compared with a case where the casting is integrated.

[0013] [Effect] In the planting portion transmission of the rice transplanter according to the first aspect, the inertia of the stop is reduced by devising the input shaft provided with the torque limiter and the pawl drive shaft provided with the ridge-side clutch in deceleration. The reliability of the ridge-side clutch, which decreases and operates stably, is improved, and the torque limiter can be made more compact. The separate arrangement of the torque limiter and the ridge-side clutch enables simplification of the structure and quick recovery in the event of a failure. Was made reasonable.

In the planting part transmission device for a rice transplanter according to the second and third aspects of the present invention, while providing a rotary-type seedling planting mechanism,
The inertia of the stop is reduced, the stable operation of the ridge-side clutch is achieved and the reliability is improved, and the separate arrangement of the torque limiter and the ridge-side clutch simplifies the structure and speeds up recovery in case of failure. Was made.

According to the third aspect of the present invention, there is provided an advantage that the torque limiter can be made compact, and the strength and size of the ridge-side clutch having a fixed position stopping function can be improved. There is.

According to a fourth aspect of the present invention, a sprocket is constructed by welding and integrating a boss and a sprocket tooth made of a plate material.
While following the rational structure that also functions as a clutch part, it has the necessary functions and can reduce costs and weight.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, an engine 3 and a transmission case 4 are provided at the front of a body provided with a pair of left and right front wheels 1 and a pair of right and left rear wheels 2 that can be steered.
The driving unit 5 is formed in the center of the fuselage, and the seedling planting device 7 is connected to the rear part of the fuselage via a link mechanism 6 so as to be able to move up and down freely to constitute a riding type rice transplanter. Seedling plant 7
Is configured as six-row planting, three planting transmission cases 8, seedling planting mechanisms a, a provided on both left and right sides of the planting transmission case 8, three ground floats 11, and a seedling mounting table. 16 or the like.

As shown in FIGS. 1 and 4, the PTO input shaft 1
The feed case 14 for transmitting the power input to the plant 3 to the three planting transmission cases 8 is equipped with a three-stage traversing transmission mechanism 15 and a traversing drive for reciprocatingly traversing the seedling mounting table 16. A shaft 17 and a vertical feed shaft 18 for vertically feeding the seedling placement device of the seedling mounting table 16 at the stroke end of the horizontal feed.
And A rear axle case 12 supports the rear wheel 2.

As shown in FIG.
Is a first shaft 1 that is linked to a PTO input shaft 13 by a bevel gear.
9 and a second shaft 20 to which the transverse drive shaft 17 is connected to the shaft end.
And a chain mechanism 22 for transmitting power to the planting transmission case 3 over the first shaft 19 and the output shaft 21.

Next, the drive structure and the like of the seedling planting mechanism a will be described. As shown in FIG. 4 and FIG. 6, the seedling planting mechanism a
A known rotary type including a rotating case 9 rotatably supported at the rear end (tip) of the planting transmission case 8 and a pair of planting arms 70, 70 provided at both ends of the rotating case 9. And each planting arm 70 has a planting claw 10
Will be equipped. A chain mechanism 7 that drives an output shaft 72 through a jump clutch (an example of a torque limiter) 71 with power from the feed case 14 is attached to the planting transmission case 8.
3 interiors. The output shaft 72 is formed on the left and right sides of the planting transmission case 8 and configured to drive a pair of left and right seedling planting mechanisms a, a. Is housed in the planting transmission case 8.

As shown in FIG. 6, the jump clutch 71
Is an input shaft 92 that receives power from the feed case 14.
A driving-side clutch member 93 provided on the input shaft 92 formed of the output shaft 21 and spline-fitted outside; a driven-side clutch member 94 fitted relatively rotatably on the input shaft 92; A spring 95 for urging the clutch member 93 toward the driven clutch member 94 is provided, and clutch pawls 93a, 94a are formed on the two clutch members 93, 94 so that they engage and rotate integrally. Have been.

As shown in FIG. 7 and FIG.
The occlusal surfaces 3a and 94a are inclined with respect to the axial direction of the input shaft 92.
When the driving load of the seedling planting mechanism a exceeds a predetermined value, the two clutch claws 93a and 94a slide on the occlusal surface, and the clutch member 93 moves in the direction away from the driven clutch member 94 against the spring 95. The two clutch claws 93a, 9
The bite 4a is released, and a clutch disengaged state is brought about.

A driven sprocket 96 is fixed to the driven clutch member 94.
The chain 73a is wound around the output shaft 72 and the driven sprocket 75 to form a chain mechanism 73. The number of teeth of the driven sprocket 75 is set to twice the number of teeth of the driving sprocket 96, and the chain mechanism 73 has an input shaft 92.
Is transmitted to the output shaft 72 after reducing the number of rotations per unit time by half.

As shown in FIG. 9, the ridge-side clutch B is relatively non-rotatable on the output shaft 72, and is spline-fitted to the output shaft 72 so as to be freely slidable in the axial direction. Driven sprocket 75 fitted in
And a cam shaft 76 as a shifter S for shifting the clutch rotating body 74 in the axial direction, and a winding spring 77 for urging the clutch rotating body 74 toward the driven sprocket 75.

The ridge-side clutch B causes the clutch rotator 74 to rotate the driven sprocket 7 by rotating the cam shaft 76.
5, the clutch pawls 74 a, 75 a of the two 74, 75 are engaged with each other so that the clutch pawls 74 a, 75 a are brought into a unitary rotation state. The fixed position stop clutch is configured such that the clutch rotation body 74 and the driven sprocket 75 assume a predetermined relative posture, and the transmission disconnection state in which the engagement of the two clutch claws 74a and 75a is released is freely performed.

As shown in FIGS. 6 and 10, the driven sprocket 75 has a boss 75 having a clutch claw 75 a formed on a side surface thereof for engaging with the clutch claw 74 a of the clutch rotating body 74.
A and a sprocket tooth 75B formed by fine blanking of a plate material are welded and integrated. The boss 75A is formed by cold forging and then carburized and quenched, and is suitable for the clutch pawl 75a having strict strength conditions.

As shown in FIGS. 9 to 11, the clutch rotating body 74 is provided with a boss 7 fitted outside the spline on the output shaft 72.
8, first and second flanges 7 axially separated from each other
9 and 80, and a single notch 80a is formed on the second flange 80 having a diameter larger than that of the first flange 79, over a predetermined angle range in the circumferential direction of the output shaft. The cam shaft 76 is rotatably supported on the planting transmission case 8 about an axis Y intersecting the axis X of the output shaft 72, and a cam disposed between the first and second flanges 79 and 80. A portion (two-plane width portion at the tip of the camshaft) 81 is formed at the shaft end.

The thickness (width dimension) of the cam portion 81 is set to be slightly smaller than the interval between the first and second flanges 79, 80. Only when it is located in the notch portion 80a, the cam portion 81 is set so that the cam shaft 76 can be turned to perform the clutch disengagement operation by pressing the first flange 79.

The cam portion 81 has two vertical plane portions, a pressing surface 81a having a diameter passing through the axis Y of the cam shaft 76 and a cut surface 81b which is a surface shifted by an appropriate thickness from the diameter portion. Have. Then, on the pressing surface 81a, a first lateral surface 76a which is a curved surface facing the peripheral surface of the first flange 79 with a slight gap therebetween in the cam axis direction is successively formed to pass the first flange 79. Similarly, a second horizontal surface 76b, which is a curved surface for passing the second flange 80, is formed on the cut surface 81b. Next, the operation of the clutch releasing operation of the ridge-side clutch B will be described.

Normally, as shown in FIG. 12A, the teeth 75a of the driven sprocket 75 and the clutch rotating body 74
A clutch-engaged state in which the winding spring 77 keeps urging the clutch rotating body 74 appears in the direction in which the tooth portion 74a formed at the lateral end of the clutch engages with the tooth portion 74a, and the cam portion 81 includes the first and second flanges. 79 and 80, the clutch rotating body 7
4 free rotations are allowed. In this state, the cam portion 81 has its pressing surface 81a shifted or pressed against the first flange 79, and a gap between the cut surface 81b and the second flange 80 in the axis X direction of the output shaft 73. Are aggregated.

Next, when the cam shaft 76 is turned, the cam 81 cannot be turned if the cam portion 81 is located between the first flange 79 and the second flange 80 at that time.
As shown in FIG. 12B, the rotation of the cam shaft 76 is started as soon as the cam portion 81 is positioned in the notch portion 80a of the second flange 80, as shown in FIG. The corner of the pressing surface 81a starts pressing the first flange 79, and starts moving the clutch rotating body 74 to the clutch disengagement side against the urging force of the winding spring 77.

When the cam portion 81 pushes the clutch rotating body 74 by a predetermined distance (4 mm) by the continued rotation of the cam shaft 76, the bite of the teeth 74a, 75a of both teeth is released, and the clutch is disengaged. . Then, as shown in FIG. 12C, when the cam portion 81 is still rotated and the clutch rotator 74 is pushed the maximum distance (5 mm), the clutch disengagement operation is completed, and the cam portion 81 is rotated about 40 degrees. Move and stop.

Even after the clutch is disengaged, the clutch rotator 74 rotates due to inertia. However, as shown in FIG. 12D, the second flange 80 enters into the second lateral surface 76b and turns to turn obliquely. The cut surface 81 of the cam portion 81 in the state
Due to the interference between b and the second flange 80 at the end of the notch 80a, the clutch rotator 74 always stops in a state where the cam portion 81 is located at the notch 80a, whereby the fixed position stop is realized. You.

When the clutch rotator 74 rotates in the reverse direction due to the inertia of collision between the cut surface 81b and the second flange 80, as shown in FIG. The outer peripheral surface and the second flange 80 come into contact with each other, and the rotation of the clutch rotator 74 is stopped in a state where the second flange 80 is prevented from entering the cam shaft 76.
That is, in the radial direction of the output shaft 72, the first
Since a step is provided between the lateral surface 76a and the second lateral surface 76b, the second flange 80 cannot enter below the first lateral surface 76a.
Is devised so as not to cause a disadvantage that the return rotation of the motor cannot be performed.

As shown in FIGS. 4 and 13, three ridge-side clutch levers 82 corresponding to three ridge-side clutches B are provided on the back side of the seedling mounting table 16. Cam lever 83 fixed to cam shaft 76 provided in transmission case 8
Are connected to each other by a first wire 84 having a Bowden wire structure including an inner wire 84a and an outer wire 84b.

The inner wire 84a and the cam lever 83 are connected via a flexible spring 85. Even when the cam portion 81 is not located in the notch portion 80a, the ridge-side clutch lever 82 swings toward the clutch disengagement side. Operation is possible.
In other words, the elastic spring 85 is extended and the accumulated urging force acts to automatically rotate the cam shaft 76 when the cam portion 81 is located at the notch portion 80a. What is necessary is just to swing the clutch lever 82 to the disengagement side.

The ridge-side clutch lever 82 includes a plate-shaped lever main body 82a rotatably supported by a support bracket 86 at a fulcrum Z, and an operating portion 82b protruding from the plate main body 82a.
And a cover 82 covering the fulcrum Z portion, and a support bracket 86 is fixed to the back surface of the seedling mounting table 16. In addition to the ridge-side clutch B, the operation unit 82b includes a vertical feed clutch 88 that is responsible for transmission and disconnection of two rows of the seedling vertical feed mechanism b, and a fertilizer device c.
A second wire 90 and a third wire 91 for turning on and off the fertilizer clutch 89 for intermittently transmitting and disconnecting the thread are interlocked and connected.

As shown in FIG. 13 (a), the first to first positions on the operating portion 82b at the positions where the clutch is engaged and disengaged, respectively.
The third inner wires 84a, 90a, 91a are connected to the first to third outer wires 84b, 9 in the support bracket 86.
0b and 91b are distributed to both sides of a line connecting the outer receiving portion and the lever swing fulcrum Z.

Then, the wires 84, 90, and 84 are set such that the clutches B, 88, and 89 are all on the clutch engagement side.
Since the tension 91 is urged, the ridge-side clutch lever 82 is configured as a dead-point type lever that is urged and maintained at both the on position and the off position.

[Another Embodiment] Input Shaft 92 and Claw Drive Shaft 72
The characteristic configuration according to claim 1 may be applied to a device including a seedling planting mechanism of a crank mechanism type in which a reduction ratio of the above is set to a value other than 2 (for example, 1.5 or the like).

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of a riding rice transplanter.

FIG. 3 is a side view of the planting section.

FIG. 4 is a system diagram showing a schematic transmission system and a clutch operation system of the planting section.

FIG. 5 is a development view showing a schematic structure inside the feed case.

FIG. 6 is a development view showing the internal structure of the planting transmission case.

FIG. 7 is a diagram showing a main part of a jump clutch.

8A is a side view showing a driven clutch member, and FIG. 8B is a side view showing a driven clutch member.

FIG. 9 is a cross-sectional view showing the structure of a ridge-side clutch.

FIG. 10 is an exploded perspective view showing a main part of a ridge-side clutch.

FIG. 11 is a side view showing a relationship between a cam shaft and a clutch rotating body.

FIG. 12 is a series of action diagrams showing a disengagement operation state of a ridge-side clutch

FIG. 13 shows the structure of a clutch lever portion on the ridge side,
(A) is a partially cutaway front view, (b) is a partially cutaway side view.

[Explanation of symbols]

 8 Planting Transmission Case 10 Planting Claw 71 Torque Limiter 72 Claw Drive Shaft 73 Chain Transmission Mechanism 75 Sprocket 75A Boss 75B Sprocket Teeth 75a Clutch Claw 92 Input Shaft B Ridge Clutch a Seedling Planting Mechanism

Claims (4)

[Claims] 1. An input shaft provided at a base of a planting transmission case is interlocked with a pawl drive shaft provided at a distal end of the planting transmission case, and the input shaft is equipped with a torque limiter. Planting section transmission of rice transplanter equipped with fixed position stop type ridge-side clutch on the drive shaft. 2. A ridge-side clutch which is provided with a nail driving shaft for driving a rotary-type seedling planting mechanism having a pair of planting claws at a distal end portion of a planting transmission case, and wherein the nail driving shaft has a fixed position stop type. And a transmission device for a rice transplanter, wherein an input shaft provided at a base of the transplantation transmission case is provided with a torque limiter. 3. The device according to claim 2, wherein the pawl drive shaft is decelerated and linked to the input shaft, and the ridge-side clutch is operated only at a fixed position in a circumferential direction of the pawl drive shaft. The planting unit transmission of a rice transplanter according to item 5. 4. An input shaft provided at a base portion of the planting transmission case and a pawl drive shaft provided at a distal end portion of the planting transmission case are interlocked by a chain transmission mechanism, and the input shaft or the pawl driving shaft is connected to the input shaft. A planting section transmission device for a rice transplanter, in which a sprocket to be mounted is formed by welding and integrating a boss having a clutch claw and a sprocket tooth formed by fine blanking.