JPH08182411A - Transmission structure for rice plant transplanter - Google Patents

Abstract

PURPOSE: To provide a transmission structure for rice plant transplanter in which the transmission is reasonably constituted to enable the load prescribed for actuating the overload protection clutch to set to a suitable level for the transplanter as avoiding the structure from becoming complicated as much as possible. CONSTITUTION: The driving force from the engine is transmitted in branches through a plurality of transmission mechanisms 19 to individual transplanting mechanisms and the transmission mechanisms 19 are each equipped with a seedling row number-changing clutch 21 and a overload protection clutch 22. Further, in a couple of rotors 23, 24 in the seedling row number-changing clutch 21, the rotor 24 on the idling side is integrally formed with the transmission 32 on the stationary side in a couple of transmissions 32, 33 in the overload protection clutch using a single body part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a plurality of planting mechanisms and transmits the power of an engine provided in a traveling machine body to each of the planting mechanisms in a state of being branched via a plurality of transmission mechanisms. In the power transmission system in each of the above-mentioned transmission mechanisms, when the drive load is below the set load, the driven side transmission body and the drive side transmission body rotate integrally, and the drive load is set to the set value. If it exceeds, either the driven side transmission body or the driving side transmission body is allowed to retreat in the direction of the axis of rotation relative to the counterpart side in the position-fixed state, allowing relative rotation, and An overload prevention clutch for preventing a load is provided, and each of a plurality of transmission branch portions where the power from the traveling machine body is branched to each of the transmission mechanisms is provided with a driving-side rotating body and a driven-side rotating body. And the transmission state in which they rotate together, To switch to the power cutoff state al is separated, one of the rotating member, about the planting machine is provided with a number of threads changes clutch constructed movably operated by the operating member.

[0002]

2. Description of the Related Art In the rice transplanter having the above structure, conventionally,
The overload prevention clutch is configured to be provided on the power transmission side of a power transmission branch portion where engine power is branched to each power transmission mechanism, and the total load to which each load in a plurality of planting mechanisms is added is added. When the drive load, which is a load, exceeds the set load, each transmission body rotates relative to each other, and it is possible to avoid the disadvantage that power transmission is continued in an overloaded state.

With such a structure, for example, in the case where a foreign matter such as weeds is wound around the planting mechanism or is contacted with a stone or the like and the driving load becomes excessive, power is transmitted. It is designed to prevent inconveniences such as continued operation, overloading the engine and stopping the engine, and applying excessive force to the planting mechanism to damage the engine. .

[0004]

However, in the above-mentioned conventional configuration, the set load for preventing overload is provided to the drive load obtained by adding all the loads of the plurality of planting mechanisms. The set load is much larger than the individual load of each planting mechanism. As a result, if the setting load is set a little higher, one of the multiple planting mechanisms is overloaded,
If other planting mechanisms are under normal rated load, an excessive driving force will be applied to the overloaded planting mechanism, which may damage the planting mechanism. Get higher Also, if the set load is set low,
For example, at the time of starting all planting mechanisms at the same time, a driving load larger than the driving load in the normal operating state may be applied.In such a case, the overload prevention clutch operates, There is a disadvantage that the planting work cannot be performed, and it has been difficult to always set the set load to a value that operates the overload prevention clutch in an appropriate state.

Therefore, as a method for solving the above-mentioned inconvenience, a drive shaft provided for directly driving the planting mechanism in a plurality of transmission mechanisms for each planting mechanism,
A configuration in which the overload prevention clutch is separately provided is conceivable, but in such an improved configuration, it is necessary to newly provide a plurality of members for configuring the overload prevention clutch for each drive shaft, There is a drawback that the number of parts increases and the structure becomes complicated.

The present invention has been made by paying attention to such a point, and an object thereof is to set the operating set load of the overload prevention clutch without causing the structure to be complicated by the rational configuration as much as possible. The point is to provide a power transmission structure for a rice transplanter that can be adapted to the load of the planting mechanism.

[0007]

The features of the first invention are as follows:
A plurality of planting mechanisms are provided, and a power transmission system is configured to transmit the power of the engine provided in the traveling machine body to each of the planting mechanisms in a state of being branched via the plurality of transmission mechanisms. In the power transmission system, when the drive load is below the set load, the driven-side transmission body and the drive-side transmission body rotate integrally, and when the drive load exceeds the set load, the driven-side transmission body and the drive side An overload prevention clutch that prevents overload by allowing either one of the transmission bodies of 1) to retract relative to the other party in the position-fixed state in the direction of the axis of rotation and to rotate relatively is provided. , A driving state in which the driving-side rotating body and the driven-side rotating body rotate integrally with each of the plurality of transmission branch portions where the power from the traveling machine body side branches to the respective transmission mechanisms. , The power cut-off state where they separate In a rice transplanter provided with a number-of-rows changing clutch configured so that any one of the rotating bodies can be moved and operated by an operation tool, the overload prevention clutch is separately provided to each of the transmission branch portions. In addition, the non-operation side rotating body of each rotating body in the thread number changing clutch, and the position fixing side transmission body of each transmission body in the overload prevention clutch are provided as a single member. The point is that they are integrally formed.

The characteristic constitution of the second invention specifies a preferable constitution when the characteristic constitution of the first invention is carried out,
In the overload prevention clutch, a plurality of engaging recesses into which a plurality of balls for torque transmission are inserted and engaged are formed at intervals in a position facing each other of the respective transmission bodies along the circumferential direction, and the drive recesses are formed. When the load exceeds the set load, one of the transmission bodies rides on the ball to allow relative rotation, and the driven side rotation body of the thread number changing clutch is separated from the position fixed side transmission body. It is configured so as to be integrally formed by one member, and a concave portion that allows the moving operation of the operation tool so as to switch to the power cutoff state only in a predetermined rotation phase is formed in a circumferential direction with each of the engagement concave portions. It is formed at a different position so as to be inserted inward in the radial direction with respect to the radial outer end position of each engagement recess.

[0009]

According to the characterizing feature of the first aspect of the invention, in each of the plurality of branch transmission parts in which the power from the traveling machine body is branched to each transmission mechanism, an overload is separately provided for each planting mechanism. Since the prevention clutch is provided, the set load for preventing overload can be set to an appropriate value as an overload state with respect to the normal load of the planting mechanism.

Therefore, it is possible to avoid the inconvenience that power transmission is continued until the load becomes excessive enough to damage the planting mechanism, and the load on the engine does not exceed the total value of the set loads, and the engine overload is prevented. Can be avoided.

In addition, in each of the plurality of branch transmissions, the number-of-rows-changing clutch provided for changing only the number of the number-of-rows to be planted by stopping only one of the plurality-of-row-planting mechanisms is changed. Utilizing the configuration, among the rotating bodies for configuring the clutch in the thread number changing clutch, the rotating body on the non-operating side, that is, the rotating body in the position fixed state and the transmitting body in each overload prevention clutch Since the power transmission member on the position fixing side is integrally formed of a single member, the number of parts can be reduced by that much as compared with the case where all members are newly provided with the overload prevention clutch.

According to the characterizing structure of the second invention, in addition to the function of the characterizing structure of the first invention, there is the following function. In each overload prevention clutch, a ball for torque transmission is engaged in an engagement recess formed at a position facing each other of each transmission body to transmit power, and when an overload state occurs, any transmission body is Relative rotation is allowed on the ball.

The clutch for changing the number of threads is provided with a recess on the driven side that allows the clutch disengaging operation of the operating tool only in the predetermined rotation phase so that the clutch is disengaged only in the predetermined rotation phase. Although the posture is configured to be stopped in a state of being separated from the field, the recesses are provided at different positions in the circumferential direction with respect to the engagement recesses into which the power transmission balls are engaged. Compared with the case where the engaging recess and the recess are provided at different positions in the axial direction of the rotating shaft or in the radial direction, the engaging recess and the recess are formed so as to enter the inner side in the radial direction from the outer end position in the radial direction. The transmission body in the overload prevention clutch can have a small diameter and a small size in the axial direction.

[0014]

According to the characteristic construction of the first aspect of the invention, when an overload is applied to each planting mechanism, the overload prevention clutch is always activated to transmit the power in a state where the overload is applied. However, inconveniences such as damage to the planting mechanism can be avoided, and overload on the engine can be effectively prevented.
In addition, the rational configuration makes it possible to provide a plurality of overload preventing clutches with a simple structure as compared with the case where all members are newly provided.

According to the characterizing structure of the second invention, the following effects are obtained in addition to the effects of the characterizing structure of the first invention. By reasonably configuring the structure of the overload prevention clutch and the structure for operating the clutch for changing the number of threads only at a predetermined rotation phase, it becomes possible to fit the overload prevention clutch in a compact shape. It was

[0016]

Embodiments will be described below with reference to the drawings. Figure 5
As shown in (1), a riding type rice transplanter is shown in which a rear part of the traveling machine body 1 is connected to a seedling planting device 3 via a parallel four-link mechanism 2 so as to be vertically movable.

The traveling machine body 1 has an engine 4 mounted on the front portion thereof, and the power of the engine 4 is transmitted to the front and rear wheels 6 and 7 via a transmission 5 to be driven for traveling. A transmission system is configured so that the power from the engine 4 and the power after being shifted by the transmission 5 is transmitted to the seedling planting device 3 via the power take-off shaft 8. A transmission system for planting work is configured.

In the seedling planting device 3, a feed case 10 into which power from the machine body is input and a plurality of transmission cases for planting are provided in each pipe-shaped main frame 9 arranged along the machine body lateral direction. 11 and 11 are fixedly connected to each other to form a frame portion, and a plurality of seedling placing bases 12 that reciprocally move laterally in a state where the planting seedlings are placed, a plurality of seedlings are taken out from the lower end of the seedling placing base 12 and are planted in the field The planting mechanism 13 and the grounding float 14 for leveling are provided. Each planting mechanism 13
In the rear part of the planted transmission case 11, a rotary case 15 which is rotationally driven around the horizontal axis is provided. At both ends of the rotary case 15, the planted claw support cases 16 are relatively rotatable around the horizontal axis. In addition to being pivotally supported, the tip of the planting claw 17 attached to the planting claw support case 16 along with the rotational drive of the rotary case 15 draws a substantially elliptical seedling takeout locus in a side view. As described above, a relative rotation mechanism (not shown) that relatively rotates the planting claw support case 16 is provided.

As shown in FIG. 4, the feed case 1
0 is connected and fixed to the main frame 9 at approximately the central portion in the lateral direction of the machine body, and the transmission case 11 with the plant is 3 at each side portion in the lateral direction of the machine body and at each central portion in the lateral direction.
They are connected and fixed in a state of being installed in parallel. Further, a pair of planting mechanisms 13 are arranged on both left and right sides of each planting transmission case 11 in a state of being rotationally driven around the same axis. Therefore, in this embodiment, the six-row planting work is performed by each planting mechanism 13 as the machine runs.

Next, the transmission structure will be described. As shown in FIG. 4, the power from the traveling machine body 1 side is transmitted to the lateral transmission shaft 18 via the power take-out shaft 8 and the feed case 10, and from the lateral transmission shaft 18, each of the planted transmission cases 11 is transferred. The power is transmitted in a state of being branched to each transmission chain 19 as a transmission mechanism provided inside. Then, the number of clutches 21 for changing the number of threads, which allows the power to be intermittently operated, is provided at each of three transmission branch portions 20 from the lateral transmission shaft 18 to each transmission chain 19.
And when the drive load of the planting mechanism 13 exceeds the set load, the driven-side transmission member and the drive-side transmission member are allowed to rotate relative to each other, and the overload prevention clutch 22 for preventing overload is provided. It is installed separately.

That is, as shown in FIG. 1, in the transmission branch portion 20 inside the front portion of the machine body of the planted transmission case 11, the laterally extending transmission shaft 18 is integrally rotatable and slidable in the axial direction. The drive-side rotating body 23 of the changing clutch 21 is externally fitted to the spline, and the driven-side rotating body 24 of the thread-number changing clutch 21 is driven by the stopper 41 on the lateral side in the axial direction of the drive-side rotating body 23. Rotating body 23
With the movement to the side being blocked, the lateral transmission shaft 18 is freely fitted to the outer side, and the driving side rotating body 23 is configured to be biased by the coil spring 25 toward the driven side rotating body 24. An occlusal portion 26 is formed at a position where the rotating bodies 23 and 24 face each other so as to integrally rotate in an occlusal state.
Then, the shift fork 27, which is an operation tool that can be freely rotated about the vertical axis P, is rotated against the spring biasing force of the coil spring 25, and the shift fork 27 is operated at the occlusal portion 26 of each of the rotating bodies 23 and 24. By releasing the occlusion, each rotating body 23, 24
Are separated from each other so that the power is cut off. Therefore, the clutch 21 for changing the number of threads is used for the shift fork 2
In the non-operation state of 7, the power transmission state is maintained, and the shift fork 27 is rotated by an operation force from the outside to switch to the power interruption state.

As shown in FIG. 2, the shift fork 2 is
The support shaft 29, which is inserted into and fitted into the oval-shaped insertion hole 28 formed on the base end side of 7, is rotatably supported while vertically penetrating the planted transmission case 11. The shift fork 27 is preassembled together with each member mounted on the lateral transmission shaft 18, and then the shift fork 27 is inserted from the outside of the planted transmission case 11 to be assembled. The support shaft 29 is adapted to be retained and supported by a retaining device 30 at a tip end portion in the insertion direction that protrudes outward from the planting transmission case 11, and the planting on the opposite side of the retaining portion is possible. A rotating operation arm 31 for rotating the shift fork 27 is provided on the outside of the transmission case 11 so as to be integrally rotatable.

Next, the structure of the overload prevention clutch 22 will be described. The non-operating side rotating body of the thread number changing clutch 21, that is, the driven side rotating body 24 and the driving side transmission body 32 integrally formed by a single member are externally fitted to the lateral transmission shaft 18 at the free ends thereof. The drive side transmission body 3
2, the driven side transmission body 33 adjacent to the lateral side in the direction of the rotation axis center,
It is provided in a state where the free end is fitted onto the lateral transmission shaft 18.
Engagement recesses 35, into which a plurality of balls 34 for torque transmission are inserted and engaged, are formed at appropriate positions in the circumferential direction at opposed positions of each of the transmission bodies 32 and 33. The driven-side transmission body 33 is configured so as to be pressed and urged toward the drive-side transmission body 32 by the coil springs 38 supported on both sides by the spring receiving members 36 and 37. Each transmission 32,3
3 is integrally rotated by the engagement state with each ball 34. Incidentally, the driven sprocket 39 for driving the transmission chain 19 is integrally formed on the driven side transmission body 33, and in the above-mentioned integral rotation state, power is transmitted to the planting mechanism 13.
Will be transmitted to.

On the side of the planting mechanism 13, for example, when the planting claw 17 comes into contact with a stone or the like and the driving load (driving torque) exceeds the set load (set torque), an abnormal state occurs. In the engagement portion of the drive side rotating body 33, the torque that can be transmitted exceeds the torque that can be transmitted, and the driven side rotating body 33 moves in the direction in which the driven side rotating body 33 separates from the drive side rotating body 32 against the spring biasing force of the coil spring 38. 32 is a ball 34
As a result, the relative rotation of the rotating bodies 332, 33 is allowed. Therefore, in such an overloaded state, the rotational power is not transmitted to the side of the planting mechanism 13, and the planting mechanism 1
It is possible to avoid the possibility of damaging the planting claw 17 and the like without applying excessive force to 3.

In the overloaded state, the sprocket 3
9 will also move laterally integrally, but transmission chain 1
Since 9 is constructed so as to be wound and stretched over a sufficiently long distance with respect to the diameter of the sprocket 39, problems such as the transmission chain 19 coming off from the sprocket 39 do not occur.

As shown in FIG. 3, the ball 3 for torque transmission is provided on the outer peripheral portion of the driven body 33.
4 engages with the engaging recesses 35 at different positions in the circumferential direction in a circumferential direction within a predetermined range in the radial inward direction with respect to the radially outer end position of each engaging recess 35. Only the recess 40 is formed. And the shift fork 2
7, an operation restricting portion 27a that contacts the outer peripheral portion of the driven side transmission body 33 is integrally formed, and when the shift fork 27 is in the clutch engaged position (non-operating state), the operation restricting portion 27a. 27a is provided so as to come into contact with the arcuate outer peripheral portion 33a of the driven side transmission body 33, and the shift fork 27 is placed at the clutch disengagement position (rotation operation position).
When it is turned toward, the operation restricting portion 27a must enter the recess 40. Therefore, the thread number changing clutch 21 can be operated only when the rotation case 15 of the planting mechanism 13 is in the predetermined rotation phase. This predetermined rotation phase is determined by the pair of planting claws 17 attached to the rotation case 15.
However, the planting claws 17 in the drive stopped state are set so as to be separated from the field scene upward as much as possible.

With this structure, as is apparent from FIG. 3, the diameter of the driven-side transmission member 33 needs only to be formed with the engagement recess 35 with which the ball 34 for torque transmission is engaged. The size can be set to the minimum size, and the diameter can be smaller than that of the structure in which the recess 40 is formed on the outer side in the radial direction with respect to the engagement recess 35. As compared with the case where the recess 40 is formed by shifting the position in the direction of the rotation axis, the thickness in the direction of the rotation axis can be reduced.

[Other Embodiments] (1) In the above embodiment, the overload preventing clutch 22 has the structure in which the balls 34 for torque transmission are engaged with the transmission members 32 and 33. May be configured so that power is transmitted by a shear pin that is sheared when the set load is exceeded.

(2) In the above embodiment, the case where the overload prevention clutch 22 is provided on the transmission lower side of the thread number changing clutch 21 is illustrated, but the overload prevention clutch 22 is provided on the transmission upper side of the thread number changing clutch 21. It may be provided.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a transmission branch section.

FIG. 2 is a vertical sectional view of a support portion of a shift fork.

FIG. 3 is a side view of the driven side rotating body.

FIG. 4 is a plan view showing a branch transmission structure.

[Figure 5] Overall side view of rice transplanter

[Explanation of symbols]

 13 Planting mechanism 21 Number-of-rows changing clutch 22 Overload prevention clutch 23, 24 Rotating body 27 Operating tool 32, 33 Transmission body 34 Ball 35 Engaging recessed portion 40 Recessed portion

Claims (2)

[Claims] 1. A plurality of planting mechanisms (13) are provided, and the power of an engine (4) provided in a traveling body (1) is branched via a plurality of transmission mechanisms (19). A transmission system is configured to transmit to the mechanism (13), and in the power transmission system of each of the transmission mechanisms (19), when the driving load is below the set load, the driven side transmission body (3
3) and the drive side transmission body (32) rotate integrally, and when the drive load exceeds the set load, the driven side transmission body (33).
One of the drive side and the drive side transmission body (32) is allowed to retreat in the direction of the rotation axis relative to the counterpart side in the position-fixed state and relatively rotate to prevent overload. A load prevention clutch (22) is provided, and power from the traveling machine body (1) side is applied to each transmission mechanism (1).
9) In each of the plurality of transmission branch portions (20) branched, the driving-side rotating body (23) and the driven-side rotating body (24) are integrally rotated, In order to switch to a power cut-off state in which any of the rotating bodies (23) and (24) is separated, there is provided a thread number changing clutch (21) configured to move and operate one of the rotating bodies (23) and (24) by an operating tool (27). A rice transplanter, wherein the overload preventing clutch (22) is separately provided in each of the transmission branch portions (20), and the rotating bodies (23) and (24) in the thread number changing clutch (21) are provided. Of the non-operation side of ()
And the power transmission body (32) on the position fixed side of the respective transmission bodies (32), (33) in the overload prevention clutch (22) are integrally formed by a single member. Machine transmission structure. 2. A plurality of balls (34) for torque transmission are inserted into and engaged with portions of the transmission bodies (32), (33) facing each other in the overload prevention clutch (22). Engagement recesses (35) are formed at intervals along the circumferential direction, and when the drive load exceeds a set load, one of the transmission bodies (32) rides on the ball (34) and allows relative rotation. And the driven-side rotating body (24) of the thread number changing clutch (21) is integrally formed with the position-fixing-side transmission body (32) by a single member, The transmission member (33) on the other side is provided with a recess (40) for allowing the moving operation of the operation tool (27) so as to switch to the power cutoff state only in a predetermined rotation phase, and each engagement recess (35). ) At different positions in the circumferential direction, Transmission structure of rice planting machine according to claim 1, wherein is formed in a state to enter the radially inner side of the radially outer end position of the engaging inlet recess (35).