JPH0595231U - Planting clutch structure in transplanter - Google Patents

Abstract

(57) [Summary] [Purpose] When adding a torque limiter function to a planting clutch mechanism equipped with a fixed position stop mechanism, the torque limiter operation is always allowed to reliably prevent damage to the planting mechanism. [Structure] Intermediate clutch wheel 2 meshing with drive-side clutch wheel 12 and driven-side clutch wheel 13
0, and the clutch wheel 20 is configured to be movable in and out of contact with the driven clutch wheel 13 while maintaining the meshed state, and the intermediate clutch wheel 20 due to overloading.
Always allow the torque limiter operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a planting clutch structure in a transplanter such as a rice transplanter.

[0002]

[Problems to be Solved by Prior Art and Invention]

 Generally, the planting clutch mechanism of this type of transplanter includes a drive clutch wheel and a driven clutch wheel that mesh with each other. It is configured to cut off power transmission by separating it from the drive side clutch wheel based on this, but this planted clutch mechanism can also be used as a torque limiter that cuts off power transmission based on automatic disengagement due to overload. Be proposed. However, the normal planting clutch mechanism is equipped with a so-called fixed-position stop mechanism that allows the driven-side clutch wheel to be separated only at a predetermined rotational position in order to always stop the planting mechanism at a predetermined position. At a position other than the predetermined rotation position of the clutch wheel, even if a temporary overload is applied, the separation operation of the driven clutch wheel is restricted, and the torque limiter does not operate.

[0003]

[Means for Solving the Problems]

 The present invention was devised with the object of providing an implanting clutch structure in an implanter capable of eliminating these drawbacks in view of the above-mentioned circumstances, and a driven clutch that meshes with a drive clutch wheel. The wheel is separated from the drive-side clutch wheel based on the operation of the clutch operation tool so as to cut off the power transmission, and a planting clutch mechanism is provided.The planting clutch mechanism is equipped with a clutch on the driven side associated with the cutting operation of the clutch operating tool. In a transplanter equipped with a fixed-position stop stopper that restricts the wheel separation operation at positions other than the predetermined rotation position of the driven clutch wheel, the planting clutch mechanism is based on automatic disengagement due to overload. In order to add a torque limiter function that cuts off power transmission, An intermediate clutch wheel that engages with both clutch wheels to relay power transmission when the clutch operation tool is inserted between the drive side clutch wheel and the drive side clutch wheel, and cuts off power transmission by separating from the drive side clutch wheel when overloaded. In addition, the intermediate clutch wheel is configured so that it can be brought into and out of contact with the driven clutch wheel while maintaining the meshing state, so that the intermediate clutch wheel can be separated from the driven clutch wheel due to overload. It is characterized by being always allowed regardless of the above. With this configuration, the present invention adds the torque limiter function to the planting clutch mechanism equipped with the fixed position stop mechanism, while at the same time permitting the operation of the torque limiter to reliably prevent damage to the planting mechanism. I was able to do so.

[0004]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 is a walk-type rice transplanter. The rice transplanter 1 is equipped with an engine 2 in the front, and a seedling stand 3 of low front and rear height is provided in the rear of the rice transplanter, and the timing for traveling the aircraft is provided. The planting claws 4 are combined with each other to scrape the unit planted seedlings from the seedling mounting table 3 and plant the seedlings on the rice field, but the basic configurations of these are all the same.

Reference numeral 5 is a transmission case for inputting the power of the engine 2, and the transmission case 5 is a first to fifth transmission shafts S1 to S1 that constitute a traveling transmission mechanism and a planted transmission mechanism. S5 is installed inside, and the engine power input by the first speed change shaft S1 is output from the third speed change shaft S3 to the running system, while it is output from the sprocket 6 provided on the fourth speed change shaft S4 to the planting system. It is about to do.

The planting system power output from the sprocket 6 is transmitted to the sprocket 8 via the chain 7, and is transmitted to the fifth transmission shaft S 5 which is also used as the planting transmission shaft and then transmitted. It is transmitted to the planting claws 4 and the like at the rear of the fuselage through the chain 10 in the case 9, but between the sprocket 8 and the fifth speed changing shaft S5, the planting clutch mechanism 11 for connecting and disconnecting the planting system power. Is installed. This planting clutch mechanism 11 comprises a drive side clutch wheel 12 and a driven side clutch 13, and the drive side clutch wheel 12 is integrally connected to the sprocket 8, while the driven side clutch wheel 13 is the fifth speed changing shaft S5. It is fitted with a spline and is movable in the axial direction. That is, a shift fork 14 is connected to the driven clutch wheel 13 so that the planting system power can be intermittently operated based on the movement of the driven clutch wheel 13 accompanying the operation of the shift fork 14. Further, reference numeral 15 is a shift lever integrally connected to the shift fork 14 via a shift shaft 16, and the shift lever 15 is operated based on the operation of a planting clutch lever 18 connected to the shift rod 15 via a connecting rod 17. The driven clutch wheel 13 is swung and moved in the direction of approaching the drive clutch wheel 12 when the planting clutch lever 18 is turned on, while the driven clutch wheel 13 is moved when the planting clutch lever 18 is cut. The clutch wheel 12 on the driving side is moved away from the clutch wheel 12. Reference numeral 19 is a returning ammunition for constantly urging the shift lever 15 toward the entering side.

Further, 20 is an intermediate clutch wheel provided between the drive-side clutch wheel 12 and the driven-side clutch wheel 13 so as to be movable in the axial direction, and the intermediate clutch wheel 20 and the drive-side clutch wheel 20. The inclined meshing claws 20a, 12a (for generating thrust force in association with overload) that mesh with each other are formed on the facing surfaces of 12, while the driven clutch wheel is on the other end surface of the intermediate clutch wheel 20. A plurality of meshing pins 20b, which are fitted in the meshing holes 13a formed in the shaft 13 so as to be slidable in the axial direction, are provided in a protruding manner. Further, between the intermediate clutch wheel 20 and the drive side clutch wheel 12, an intermediate clutch wheel 20 is provided. An ammunition 21 is provided for urging the clutch wheel 20 toward the clutch wheel 12 on the constantly driving side. The intermediate clutch wheel 20 meshes with both clutch wheels 12 and 13 to relay power transmission when the planting clutch lever 18 is in the on-operating state, while it engages with the meshing pin 20b and the meshing hole when the planting clutch lever 18 is in the cutting operation state. Power transmission is cut off based on the release of meshing with 13b. However, if thrust force is generated between the inclined meshing pawls 20a and 12a due to overload, the urging force of the ammunition 21 is resisted. It is separated from the drive side clutch wheel 12 to cut off the power transmission. That is, the intermediate clutch wheel 20 constitutes a torque limiter mechanism that cuts off power transmission due to overload, but when it is separated from the drive side clutch wheel 12 against the urging force of the bullet 21. Since the meshing pin 20b slides in the meshing hole 13a, the driven clutch wheel 13 is prevented from moving.

On the other hand, reference numeral 22 denotes a stopper projectingly provided in the transmission case 5, the stopper 22 being provided so as to face the flange portion 13b of the driven clutch wheel 13, and the flange portion 13b and the flange portion 13b. In the contacting state, the movement of the driven clutch wheel 13 to the cut side is restricted, while in the state where it is aligned with the notch 13c position of the flange portion 13b, this is allowed. That is, the notch 13c of the flange portion 13b is formed so as to coincide with the stopper position in a state where the planting claw 4 is located at the top dead center. However, when the torque limiter is actuated as described above, that is, when the intermediate clutch wheel 20 is moved, the driven clutch wheel 13 is not moved to the cutting side, so that the torque limiter operation is allowed regardless of the position of the planting pawl 4. It is becoming like this.

In the embodiment of the present invention configured as described above, when the planting clutch lever 18 is operated to the entry side, the intermediate clutch wheel 20 meshes with both the clutch wheels 12 and 13 to transmit the planting power. In addition, when the planting clutch lever 18 is operated to the cutting side, the power transmission is cut off based on the disengagement of the meshing pin 20b of the intermediate clutch wheel 20 and the meshing hole 13b of the driven clutch wheel 13. The planting claw 4 stops at a predetermined top dead center position based on the movement regulation of the driven clutch wheel 13 by the stopper 22. Further, if the planting claw 4 is overloaded while the planting clutch lever 18 is in the on-operation state, the intermediate clutch wheel 20 automatically moves against the biasing force of the ammunition 21, and based on this, The power transmission is cut off by this, but at this time the driven clutch wheel 13 is located at the entry position, so there is no restriction by the stopper 22. Therefore, the planting clutch mechanism 11 provided with the fixed position stop mechanism is also used as the torque limiter that cuts off power transmission due to overload, but the torque limiter operation is always permitted regardless of the operating position of the planting claw 4. As a result, when an overload occurs, the power transmission is surely cut off based on the torque limiter operation that is always allowed, and the inconvenience that an abnormal load is applied to the planting claw 4 is eliminated, and the planting claw 4 is removed. It can be surely protected.

Moreover, the ammunition 21 for urging the intermediate clutch wheel 20 toward the entry side is not provided as the return ammunition 19 of the shift lever 15 but provided independently, so that the shift lever 15 is There is no inconvenience of increasing the operating force of the planting clutch lever 18 to be operated, and the operability can be improved.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the intermediate clutch wheel 20 and the driven clutch are not limited to the second embodiment shown in FIGS. 7 and 8, for example. The power transmission to the wheel 13 may be performed by the meshing claws 20c and 13d that mesh with each other. In other words, the meshing claws 20c and 13d have long claw lengths, and normally, the meshing of the tip portions of the claws is shallowly meshed with each other. It is acceptable.

[0012]

[Operation effect]

 In short, since the present invention is configured as described above, the planting clutch mechanism equipped with the fixed-position stop mechanism is added with the torque limiter function. The intermediate clutch wheel, which is provided so as to be separated, can be brought into and out of contact with the driven clutch wheel while maintaining the meshed state, so there is no need for a stopper that stops at a fixed position based on the movement restriction of the driven clutch wheel. It is possible to always perform the separating operation without being restricted. In other words, when an overload occurs, the power transmission can be cut off regardless of the rotational position of the driven clutch wheel, which eliminates the inconvenience of overloading the planting mechanism and reliably protects the planting mechanism. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view of a walk-behind rice transplanter.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of an essential part of the same.

FIG. 4 is a developed sectional view of a main part of a transmission case.

FIG. 5 is a cross-sectional view of a planting clutch mechanism.

FIG. 6 is a side view of the same.

FIG. 7 is a sectional view of a planting clutch mechanism showing a second embodiment.

FIG. 8 is an enlarged view of a main part of the same.

[Explanation of symbols]

 1 Rice transplanter 11 Planting clutch mechanism 12 Drive side clutch wheel 13 Driven side clutch wheel 18 Planting clutch lever 20 Intermediate clutch wheel 21 Ammo 22 Stopper

Claims (1)

[Scope of utility model registration request] 1. A planting clutch mechanism for cutting off power transmission by separating a driven clutch wheel, which meshes with the driving clutch wheel, from the driving clutch wheel based on the operation of a clutch operating tool, and the planting clutch mechanism. In the transplanter provided with a fixed-position stop stopper for restricting the separation operation of the driven clutch wheel associated with the cutting operation of the clutch operating tool at a position other than the predetermined rotational position of the driven clutch wheel, the planting clutch mechanism is provided. When adding a torque limiter function that cuts off power transmission based on automatic disengagement due to overload,
Between the drive-side clutch wheel and the driven-side clutch wheel, when the clutch operating tool is turned on and off, the clutch wheels engage with each other to relay the power transmission, and when overloaded, the power transmission is separated from the drive-side clutch wheel. An intermediate clutch wheel to be disconnected is provided, and the intermediate clutch wheel is configured to come into contact with and separate from the driven clutch wheel while maintaining a meshed state, so that the intermediate clutch wheel is separated from the driven clutch wheel due to overload. The planting clutch structure in the transplanter, which is always allowed regardless of the rotational position of the plant.