JP6700808B2 - Paddy work machine - Google Patents

Description

  The present invention relates to a paddy working machine, and more specifically, to a continuously variable transmission that continuously drives a traveling device while continuously shifting the continuously variable transmission, and a forward operation range for shifting the continuously variable transmission to a forward drive state, and the continuously variable transmission. A reverse operation area for performing a speed change operation of the transmission to a reverse drive state, and a neutral operation area for performing a speed change operation of the continuously variable transmission to a neutral state while being located between the forward operation area and the reverse operation area. The present invention relates to a paddy work machine equipped with a gear shift lever that is manually operated.

  In the riding-type rice transplanter as the paddy working machine described above, conventionally, as shown in, for example, Patent Document 1, the driving force is transmitted to the seedling planting device as the working unit by being switched to the on-state, and then in the cut state. It is equipped with a back clutch that releases the transmission of driving force to the seedling planting device by switching, and with a linkage mechanism that links the on/off operation of the back clutch and the switching operation of the main speed change lever. In some cases, the clutch can be switched to the on state by the linkage mechanism to drive the seedling planting device, and the back clutch can be switched to the disengaged state by the linkage mechanism to stop the seedling planting device when traveling backward.

  In Patent Document 1, specifically, a detection lever that comes into contact with the main shift lever and detects an operation to the reverse shift position side of the main shift lever is swingably provided. A detection lever and a rocking operation member for opening and closing the back clutch are interlockingly connected via a connecting rod and a bell crank.

JP, 2005-113961, A

  In order to control the back clutch to be switched between the engaged state and the disengaged state based on the detection result of the operation position of the speed change lever, when the conventional technique is adopted, when the reverse traveling is switched to the forward traveling, the stepless operation is continuously performed. The back clutch is switched to the engaged state at the timing until the transmission is switched to the forward drive state, that is, at the timing when the continuously variable transmission is still in the neutral state.

  That is, as the operation range of the shift lever, there are a forward operation range, a reverse operation range, and a neutral operation range extending between the forward operation side neutral operation position facing the forward operation range and the reverse side neutral operation position facing the reverse operation range. Is set. When the conventional technique is adopted, when the shift lever is located in the reverse operation range and the neutral operation position on the reverse side, the detection lever comes into contact with the shift lever and the back clutch is controlled to the disengaged state. However, since the detection lever does not move to the forward operation area and the neutral operation position on the forward side, that is, the forward operation area and the neutral operation position on the forward side are outside the detection target range of the detection lever, the shift lever moves backward. By moving from the neutral operation position on the side to the neutral operation position on the forward side, the back clutch is controlled to be switched to the engaged state.

When the back clutch is switched to the engaged state by the speed change lever being located at the forward side neutral operation position, the work unit can be driven even though the speed change lever is located at the forward side neutral operation position. May become.
That is, in the case where the output of the continuously variable transmission is transmitted to the working unit, the continuously variable transmission is generated even if the gearshift lever and the continuously variable transmission are uncoordinated and the gearshift lever is located at the forward operation side neutral operation position. If the device does not enter the neutral state but remains in the transmission state, the working unit may be driven even though the gear shift lever is located at the forward operation neutral position.

  The present invention controls the back clutch to be in the on state based on the detection result of the operation position of the shift lever during forward traveling, and the back clutch is disengaged based on the detection result of the operation position of the transmission lever during reverse traveling. A paddy work machine in which the back clutch is not controlled to be engaged until the continuously variable transmission is switched to the forward drive state when the vehicle is switched from the reverse drive to the forward drive.

A paddy work machine according to the present invention is a continuously variable transmission that drives a traveling device by continuously changing gears,
The driving force is transmitted to the working unit by switching to the ON state based on the operation of the work lever, and the driving force is transmitted to the working unit by switching to the OFF state based on the operation of the working lever. A planted clutch that releases power transmission,
Positioned between a forward operation area for shifting the continuously variable transmission to a forward drive state, a reverse operation area for shifting the continuously variable transmission to a reverse drive state, and a forward operation area and a reverse operation area. In addition, a neutral operation range in which the continuously variable transmission is operated to change gears to a neutral state, and a speed change lever that is operated by human operation,
A back clutch that transmits the driving force to the working unit by being switched to the on state and releases the transmission of the driving force to the working unit by being switched to the off state;
A clutch control mechanism that detects the operation position of the shift lever and controls switching of the back clutch based on the detection result;
In the neutral operation range, the shift lever is operable across a forward operation side neutral operation position facing the forward operation range and a reverse side neutral operation position facing the reverse operation range,
When the shift lever is operated in the forward operation area from the neutral operation position on the forward side and positioned in the forward operation area, the clutch control mechanism controls the back clutch to be switched to the engaged state,
When the speed change lever is located in the neutral operation range, the clutch control mechanism disengages the back clutch regardless of the movement of the speed change lever between the forward side neutral operation position and the reverse side neutral operation position. Switch to state and control
When the shift lever is located in the reverse operation range, the clutch control mechanism controls the back clutch to be switched to the disengaged state.

  According to this configuration, when the shift lever is operated in the forward operation range, the back clutch is controlled to the on state by the clutch control mechanism, and when the shift lever is operated in the reverse operation range, the back clutch is disengaged by the clutch control mechanism. Controlled by the state.

  To switch the continuously variable transmission from the reverse drive state to the forward drive state, the speed change lever is moved from the reverse operation range to the neutral operation position on the reverse side and then moved to the neutral operation position on the forward side. To the forward operation area. The back clutch is still switched to the disengaged state when the shift lever is in the reverse operation neutral position or in the forward operation neutral position, and the shift lever is in the forward operation range. For the first time, the back clutch is controlled to the on state.

  Therefore, when traveling forward, the back clutch can be controlled to be in the on state to drive the working unit, and when traveling backward, the back clutch can be controlled to be in the disengaged state to stop the working unit. When switching, even if the continuously variable transmission switches from the reverse drive state to the neutral state, the back clutch is still in the disengaged state, and the back clutch cannot be released until the continuously variable transmission switches from the neutral state to the forward drive state. Since the state is switched to the engaged state, it is possible to avoid the possibility that the back clutch is not engaged in the neutral state before switching to the forward traveling and the working unit is driven in the stopped state.

  In the present invention, the clutch control mechanism includes a detector provided on the lateral side of the operation path of the speed change lever so as to be swingable over a clutch engagement command range and a clutch disengagement command range, and the detection body. An urging mechanism for oscillating in a clutch engagement command range, and when the speed change lever is located in the neutral operation range and the reverse operation range, the detection body is pressed by the speed change lever to cause the clutch disengagement command range. When the gear shift lever is positioned in the forward operation range, the detection body is preferably rocked in the clutch engagement command range by the biasing mechanism.

  According to this configuration, the detection body is swingably provided on the lateral side of the operation path, and the simple and inexpensive structure is provided only by providing the biasing mechanism that swings and biases the detection body in the clutch engagement command range. The back clutch can be held in the disengaged state until the transmission is switched to the forward drive state.

It is a right side view which shows the whole riding type rice transplanter. It is a block diagram showing a power transmission system which transmits a driving force to a front wheel, a rear wheel, and a seedling planting device. It is a diagram showing a power transmission system that transmits a driving force to front wheels and rear wheels. It is a diagram showing a power transmission system that transmits a driving force to a seedling planting device. It is an explanatory view showing a clutch control mechanism in a state where a shift lever is located in a forward operation range. It is an explanatory view showing a clutch control mechanism in a state where a shift lever is located at a neutral operation position on a forward side. It is an explanatory view showing a clutch control mechanism in a state where a shift lever is located in a neutral operation position on a reverse side. It is an explanatory view showing a clutch control mechanism in a state where a shift lever is located in a reverse operation range. It is an explanatory view showing a clutch control mechanism in a state where a shift lever is located in a reverse operation range. It is sectional drawing which shows a fractional thread clutch. FIG. 11 is a sectional view taken along line XI-XI of FIG. 10. It is a top view which shows a passive rotating body. It is explanatory drawing which shows the operation position of a work lever. It is explanatory drawing which shows the operation position of the work lever of the riding type rice transplanter provided with another implementation structure.

  Hereinafter, a case where the embodiment of the paddy field working machine according to the present invention is applied to a riding type rice transplanter as an example of the paddy field working machine will be described with reference to the drawings. FIG. 1 is a right side view showing the entire riding type rice transplanter.

  As shown in FIG. 1, the riding type rice transplanter includes a traveling vehicle body 4 provided with a pair of left and right front wheels 2 (traveling device) and a pair of left and right rear wheels 3 (traveling device) under a vehicle body frame 1. There is. A driving unit 6 having an engine 5 is provided at the front of the traveling vehicle body 4. The traveling vehicle body 4 is self-propelled when the left and right front wheels 2 and the left and right rear wheels 3 are driven by the driving force from the engine 5. A driving unit 8 having a driving seat 7 is provided at the rear of the traveling vehicle body 4. The traveling vehicle body 4 is of a riding type so as to be operated by riding on the driving unit 8.

  A seedling planting device 10 (working part) is connected to the rear part of the traveling vehicle body 4 via a link mechanism 9. The seedling planting device 10 includes a plurality of grounding floats 11 arranged in the lateral width direction of the traveling vehicle body 4, a plurality of seedling planting mechanisms 12 arranged in the lateral width direction of the traveling vehicle body 4, and seedlings supplied to the seedling planting mechanism 12. A mounting table 13 is provided. The ground float 11 is supported on the lower portion of the planting frame 14. The link mechanism 9 is extended from the traveling vehicle body 4 so as to be vertically swingable. In the seedling planting device 10, the link mechanism 9 is oscillated by the hydraulic cylinder 9a, so that the grounding float 11 is in a descending work state in which the grounding float 11 is in contact with the field scene, and the grounding float 11 is in a state in which the grounding float 11 is lifted from the field scene. Ascending/descending operation is performed in the ascending and non-working state.

  The riding-type rice transplanter lowers the seedling planting device 10 to a descending work state, and runs the traveling vehicle body 4 in this state, so that the seedling planting device 10 carries out the planting work of a plurality of rows of rice seedlings.

  Transmission of the driving force to the front wheels 2 and the rear wheels 3 is performed based on the power transmission system shown in FIGS. That is, the driving force of the output shaft 5 a of the engine 5 is transmitted to the input shaft 21 a of the continuously variable transmission 21 via the endless belt 20, and the driving force of the output shaft 21 b of the continuously variable transmission 21 is input to the auxiliary transmission 22. To be done. The output of the auxiliary transmission 22 is input to the traveling auxiliary transmission 23, and the output of the traveling auxiliary transmission 23 is input to the front wheel differential mechanism 24. The driving force of the left and right output shafts 24a of the front wheel differential mechanism 24 is transmitted to the left and right front wheels 2 via the left and right front wheel drive cases 25. The output of the traveling auxiliary transmission device 23 is taken out from the transmission case 27 by the power take-off shaft 26, and the taken-out driving force is transmitted to the input shaft 29a of the rear wheel drive case 29 via the rotary shaft 28. The driving force of the input shaft 29a is distributed and transmitted to the left and right rear wheels 3, 3 by the rotating shaft 30.

  The continuously variable transmission 21 is composed of a hydrostatic continuously variable transmission. The continuously variable transmission 21 drives the front wheels 2 and the rear wheels 3 to the forward side by a gear shift operation in the forward drive state, and shifts the gears in a reverse drive state to the front wheel 2 and the rear wheel 3. Is driven to the reverse side, and the front wheels 2 and the rear wheels 3 are stopped by performing a shift operation to a neutral state. The neutral state is located between the forward drive state and the reverse drive state. In both the forward drive state and the reverse drive state, the continuously variable transmission 21 continuously changes the speed of the front wheels 2 and the rear wheels 3 to drive them.

  The subtransmission device 22 is shifted to a two-stage transmission state of high speed and low speed by sliding the shift gear 22a. The traveling auxiliary transmission device 23 is shifted to a two-stage transmission state of high speed and low speed by sliding the shift gear 23a. The front wheel 2 and the rear wheel 3 can be sub-shifted in four stages by a combination of the two-stage shift of the sub transmission 22 and the two-stage shift of the traveling sub transmission 23.

  Transmission of the driving force to the seedling planting device 10 is performed based on the power transmission system shown in FIGS. That is, the output of the auxiliary transmission 22 is input to the back clutch 31, and the output of the back clutch 31 is input to the first planted transmission 33 via the torque limiter 32. The output of the first planted transmission 33 is input to the second planted transmission 34, and the output of the second planted transmission 34 is input to the planting clutch 35. The output of the planting clutch 35 is taken out from the mission case 27 by the power takeoff shaft 36, and the taken driving force is transmitted to the input shaft 10a of the seedling planting device 10 via the rotary shaft 37.

  The back clutch 31 is switched to the engaged state to transmit the output of the auxiliary transmission 22 to the torque limiter 32, thereby transmitting the driving force to the seedling planting device 10. When the back clutch 31 is switched to the disengaged state, the transmission of the driving force from the sub-transmission device 22 to the torque limiter 32 is cut off to release the transmission of the driving force to the seedling planting device 10.

  The planting clutch 35 is switched between an engaged state and a disengaged state by sliding the shifter 35b with the operation rod 35a. When the planting clutch 35 is switched to the ON state, the output of the second planting transmission 34 is transmitted to the power take-off shaft 36, thereby transmitting the driving force to the seedling planting device 10. The planting clutch 35 is switched to the disengaged state to cut off the transmission of the driving force from the second planting transmission 34 to the power takeoff shaft 36, thereby transmitting the driving force to the seedling planting device 10. To cancel.

  The first planted transmission 33 can shift gears in two stages of high speed and low speed by sliding the shift gear 33b with the shift lever 33a. The second planted transmission 34 can shift to a four-stage shift state by sliding the shift key 34b with the shift lever 34a. By combining the two-step speed change of the first plant-attached transmission 33 and the four-step change of the second plant-attached transmission 34, the drive speed of the seedling planting apparatus 10 can be changed in eight stages, and the plant spacing can be adjusted in eight sizes. Can be changed.

  As shown in FIG. 2, the planting clutch 35 is inserted and a check mechanism 38 is provided. A detection switch 39 is linked to the check mechanism 38. The detection switch 39 detects, based on the operating position of the auxiliary shift lever 23b that shifts the auxiliary drive transmission 23, whether the auxiliary drive transmission 23 is in a high-speed transmission state or a low-speed transmission state. That is, when the auxiliary transmission lever 23b is operated to the high speed position [H], the detection switch 39 comes into contact with the detection portion of the detection switch 39 by the auxiliary transmission lever 23b, so that the traveling auxiliary transmission device 23 enters the high speed transmission state. It becomes a high-speed detection state that detects when it is operated. When the auxiliary shift lever 23b is operated to the low speed position [L], the detection switch 39 releases the contact between the auxiliary shift lever 23b and the detection unit of the detection switch 39, so that the traveling auxiliary transmission device 23 operates at a low speed. The low-speed detection state is detected in which the transmission state is detected. When the detection switch 39 is in the high-speed detection state, the entrainment check mechanism 38 is switched to the on state based on the information from the detection switch 39 to produce the planting clutch 35 for drafting, and the entrainment state of the planting clutch 35 is changed. Disable switching. When the detection switch 39 is in the low speed detection state, the engagement check mechanism 38 switches to the off state based on the information from the detection switch 39, releases the extension production for the planting clutch 35, and engages the planting clutch 35. Allows switching to the state.

  When the traveling auxiliary transmission device 23 is shifted to the low speed transmission state, the engagement check mechanism 38 is switched to the off state and the planting clutch 35 can be operated in the engagement state, so that seedling planting work can be performed. At the time of mobile traveling, it is attempted to carry out seedling planting with the traveling auxiliary transmission 23 that has been shifted to the high speed transmission state in the shifting state, or when the seedling is planted, the traveling auxiliary transmission 23 is mistakenly switched to the high transmission state. When the speed is changed, the entrainment restraint mechanism 38 is switched to the on state and the planting clutch 35 cannot be operated in the engaged state, so that the seedling planting device 10 cannot be driven.

  When the traveling auxiliary transmission device 23 is shifted to a high speed transmission state and the planting clutch 35 is switched to an engaged state, an alarm sound is generated or an error display is displayed. A configuration in which the operation command for switching the planting clutch 35 to the on state is released when the device 23 is shifted to the high speed transmission state may be adopted instead of the on/off control mechanism 38.

  As shown in FIG. 2, a speed change lever 40 is interlocked with a speed change operation portion of the continuously variable transmission 21. The shift operation unit shifts the continuously variable transmission 21 by changing the swash plate angle of the hydraulic pump 21c constituting the continuously variable transmission 21. The gear shift operation portion and the gear shift lever 40 are interlocked and coupled by a mechanical interlocking mechanism 41 using a swinging link (not shown), a rod (not shown), or the like. As shown in FIG. 1, the speed change lever 40 is supported at a portion laterally of the steering handle 42 in the driving unit 8. The continuously variable transmission 21 can be shifted by swinging the shift lever 40 in the operation path 43 shown in FIG.

  That is, as shown in FIGS. 5 to 9, the forward operation area F is set at one end side portion of the operation path 43, the neutral operation area N is set at an intermediate portion of the operation path 43, and the other end side of the operation path 43 is set. The reverse operation area R is set in the section. The forward operation region F and the reverse operation region R are set to extend in the front-rear direction of the traveling vehicle body 4. The neutral operation area N is set to extend in the lateral width direction of the traveling vehicle body 4. The neutral operation area N is provided with a forward operation side neutral operation position nf facing the forward operation area F and a reverse side neutral operation position nr facing the reverse operation area R in different operating positions.

  As shown in FIG. 5, by operating the shift lever 40 in the forward operation range F, the continuously variable transmission 21 can be shifted to the forward drive state. In the forward operation area F, the closer the shift lever 40 is to the end opposite to the neutral operation area side, the more the continuously variable transmission 21 can be operated to the higher speed side in the forward drive state.

  As shown in FIGS. 6 and 7, by operating the shift lever 40 in the neutral operation range N, the continuously variable transmission 21 can be shifted to the neutral state. Even if the speed change lever 40 is moved between the forward operation side neutral operation position nf and the reverse operation side neutral operation position nr, the continuously variable transmission 21 can be changed to the neutral state.

  As shown in FIGS. 8 and 9, by operating the speed change lever 40 in the reverse operation range R, the continuously variable transmission 21 can be changed to the reverse drive state. In the reverse operation range R, the closer the shift lever 40 is to the end on the side opposite to the neutral operation range side, the more the continuously variable transmission 21 can be shifted to the higher speed side in the reverse drive state.

  As shown in FIG. 2 and FIGS. 5 to 9, the back clutch 31 and the shift lever 40 are linked by the clutch control mechanism 50. When the shift lever 40 is located in the forward operation range F as shown in FIG. 5, the clutch control mechanism 50 controls the switching of the back clutch 31 to the engaged state. When the speed change lever 40 is located in the neutral operation range N as shown in FIGS. 6 and 7, the clutch control mechanism 50 moves the speed change lever 40 between the forward side neutral operation position nf and the reverse side neutral operation position nr. Regardless, the back clutch 31 is controlled to be switched to the disengaged state. The clutch control mechanism 50 switches the back clutch 31 to the disengaged state when the shift lever 40 is located in the reverse operation range R as shown in FIGS.

  That is, when performing seedling planting work, the continuously variable transmission 21 is operated to shift to the forward drive state. In this case, the back clutch 31 is engaged by the control of the clutch control mechanism 50. Therefore, by shifting the traveling auxiliary transmission device 23 to a low speed transmission state, the engagement check mechanism 38 is turned off and the planting clutch 35. Since it can be switched to the ON state, the seedling planting device 10 can be driven.

  When traveling backward, the back clutch 31 is disengaged under the control of the clutch control mechanism 50 simply by shifting the continuously variable transmission 21 to the reverse drive state, so that the seedling planting apparatus 10 can be stopped.

  When the speed change lever 40 is operated to the neutral operation range N to stop the traveling vehicle body 4, the speed change lever 40 is moved to any neutral operation position in the range extending from the forward operation side neutral operation position nf to the reverse operation side neutral operation position nr. Even if it is located, the back clutch 31 is disengaged by the control of the clutch control mechanism 50. That is, the seedling planting device 10 can be reliably stopped only by shifting the continuously variable transmission 21 to the neutral state.

  The clutch control mechanism 50 specifically includes a detection unit 51 and a control unit 56, as shown in FIGS. 5 to 9.

  The detection unit 51 includes a detection body 52 and a spring 53. The detection body 52 is swingably supported on the lateral side of the operation path 43 via a support shaft 54, and with the shaft center of the support shaft 54 as the swing center P, the clutch engagement command range A and the clutch disengagement shown in FIG. It swings over the command range B. A first detection portion 52a and a second detection portion 52b are formed on one free end side portion of the detection body 52. The first detector 52a is located closer to the swing center P than the second detector 52b. The first detection unit 52a projects toward the operation path 43 more than the second detection unit 52b. The spring 53 urges the detector 52 to swing into the clutch engagement command range A. In this embodiment, the spring 53 is adopted as the urging mechanism, but various urging means such as rubber may be adopted instead of the spring 53.

  As shown in FIG. 5, when the shift lever 40 is operated in the forward operation range F, the second detection portion 52b is received and supported by the stopper 55 and the first detection portion 52a is not pressed by the shift lever 40. The detection body 52 is in a detection state for detecting that the shift lever 40 is located in the forward operation range F. When it is detected that the shift lever 40 is located in the forward operation range F, the detection body 52 is located in the clutch engagement command range A due to the swinging bias of the spring 53, and the back clutch 31 is switched to the engagement state. A clutch engagement operation force as a clutch engagement command to be performed is applied to the control unit 56.

  As shown in FIGS. 6 and 7, when the shift lever 40 is operated in the neutral operation range N, the first detection portion 52a comes into contact with the shift lever 40 and is pressed by the shift lever 40. The detection state for detecting that the shift lever 40 is located in the neutral operation range N is set. When the shift lever 40 is detected to be located in the neutral operation range N, the detection body 52 is moved from the clutch engagement command range A to the clutch disengagement command range B by the pressing operation of the shift lever 40, and is positioned in the clutch disengagement command range B. A clutch disengagement operation force as a disengagement command is applied to the control unit 56.

  As shown in FIGS. 6 and 7, even if the speed change lever 40 is moved between the forward operation side neutral operation position nf and the reverse speed side neutral operation position nr, the first detection unit 52 a does not press the speed change lever 40. Accordingly, the detection body 52 is located in the clutch disengagement command range B outside the clutch engagement command range A, and applies the clutch disengagement operation force as the clutch disengagement command to the control unit 56.

  As shown in FIGS. 8 and 9, when the speed change lever 40 is operated in the reverse operation range R, the first detection unit 52a comes into contact with the speed change lever 40 and receives the pressing operation by the speed change lever 40, or Since the detection unit 52b comes into contact with the speed change lever 40 and receives a pressing operation by the speed change lever 40, the detection body 52 is in a detection state of detecting that the speed change lever 40 is located in the reverse operation range R. When detecting that the shift lever 40 is located in the reverse operation range R, the detection body 52 deviates from the clutch engagement command range A and is located in the clutch disengagement command range B when the shift lever 40 is pressed. The clutch disengagement operation force as a command is applied to the control unit 56.

  As shown in FIGS. 5 to 9, the control unit 56 includes a clutch control member 57, and the clutch control member 57 is operated by the clutch disengagement operation force and the clutch engagement operation force provided by the detection body 52 to operate the back clutch. 31 is switched to the ON state or switched to the OFF state.

  That is, the clutch control member 57 is attached across the detection body 52 and the operation arm 31 a of the back clutch 31. The end of the clutch control member 57 on the side of the detection body relatively swings to the free end side of the detection body 52 opposite to the side on which the first detection unit 52a and the second detection unit 52b are located via the connecting pin 58. It is movably connected. An elongated hole 59 is formed at the end of the clutch control member 57 on the operation arm side. The connecting pin 31b slidably engaged in the long hole 59 is fixed to the operation arm 31a.

  As shown in FIGS. 5 to 9, the operation arm 31a is swingably supported to the outside of the mission case 27 via a shifter support shaft 31c, and the clutch engagement position is about the shaft center of the shifter support shaft 31c as a swing center. It swings between [ON] and the clutch disengagement position [OFF]. When the operation arm 31a is operated to the clutch engagement position [ON], the shifter support shaft (not shown) is rotated to switch the back clutch 31 to the engagement state. When the operation arm 31a is operated to the clutch disengaged position [disengaged], the shifter support shaft is rotated to switch the back clutch 31 to the disengaged state. The operating arm 31a is swingably biased to the clutch disengaged position [disengaged] by disengagement biasing means (not shown). The cutting and urging means is provided inside the mission case 27.

  As shown in FIG. 5, when the shift lever 40 is operated in the forward operation area F and the detection body 52 is positioned in the clutch engagement command area A, the clutch control member 57 is operated by the clutch engagement operation force of the detection body 52 to operate the operation arm 31a. Since the portion of the clutch control member 57 located at the end of the elongated hole 59 pushes the connecting pin 31b, the clutch control member 57 moves the operating arm 31a against the cutting and biasing means. Operate to the clutch engagement position [ON].

  As shown in FIGS. 6 and 7, when the speed change lever 40 is operated in the neutral operation range N and the detection body 52 is located in the clutch disengagement command range B, the clutch control member 57 is operated by the clutch disengagement operation force of the detection body 52. Since the elongated hole portion releases the pressing operation of the connecting pin 31b by pulling to the side opposite to the arm 31a side, the clutch control member 57 operates the operation arm 31a to the clutch disengaged position [disengaged] by the disengagement biasing means. Even if the shift lever 40 is operated to move between the forward operation side neutral operation position nf and the reverse operation side neutral operation position nr, the detection body 52 is positioned in the clutch disengagement command range B, and the clutch control member 57 is operated by the operation arm 31a. Since the slot 59 is pulled to the side opposite to the side and the connecting hole 31b remains, the clutch control member 57 maintains the operating arm 31a in the clutch disengaged position [disengaged].

  As shown in FIGS. 8 and 9, when the shift lever 40 is operated in the reverse operation range R and the detection body 52 is positioned in the clutch disengagement command range B, the shift lever 40 is operated in the neutral operation range N as in the case where the shift lever 40 is operated in the neutral operation range N. In addition, the clutch control member 57 is pulled to the side opposite to the operation arm 31a side by the clutch disengagement operation force of the detection body 52, and the elongated hole 59 leaves the connecting pin 31b. Therefore, the clutch control member 57 moves the operation arm 31a. Operate to the clutch disengagement position [disengagement] by the disengagement biasing means.

  FIG. 10 is a cross-sectional view showing the fraction thread clutch 60. The fractional-number clutch 60 is switched to the on-state to transmit the driving force of the input shaft 10a to two adjacent seedling planting mechanisms 12 out of the plurality of seedling planting mechanisms 12, and thus the two seedlings. The planting mechanism 12 is driven. The fractional-number clutch 60 is switched to the disengaged state to cut off the transmission of the driving force to the two seedling planting mechanisms 12 and stop the two seedling planting mechanisms 12. The fractional-number clutch 60 has a fixed-position stop function for maintaining the seedling planting mechanism 12 in a stopped state in a rotation phase in which the planting claw 12a (see FIG. 1) comes out from the mud portion of the field. ..

  As shown in FIG. 10, the fractional thread clutch 60 includes a driving rotary body 61, a passive rotary body 62, and a meshing type clutch body 63. The clutch body 63 is provided across the drive rotary body 61 and the passive rotary body 62. The drive rotator 61 is supported at the end of the output side rotation shaft 64 so as to be relatively rotatable. The drive rotating body 61 is interlockingly connected to the input shaft 10a (see FIG. 4) via the gear 65 and the input side rotating shaft 66, and is driven by the driving force of the input shaft 10a. The output side rotation shaft 64 is interlockingly connected to the two seedling planting mechanisms 12 (see FIG. 1) adjacent to each other at the end opposite to the end supporting the drive rotor 61.

  The passive rotating body 62 is supported by the spline portion 64a of the output side rotation shaft 64 so as to be relatively non-rotatable and slidable. A spring 67 is mounted across a side portion of the passive rotary body 62 opposite to the clutch body 63 side and a spring receiving portion 64b of the output side rotation shaft 64. The spring 67 slides and biases the passive rotary body 62 toward the drive rotary body 61, and biases the clutch body 63 into the engaged state. An operation recessed portion 68 as shown in FIGS. 11 and 12 is formed on the peripheral portion of the passive rotary body 62. An inclined cam surface portion 69, a positioning surface portion 70, and a stopper portion 71 are provided inside the operation recessed portion 68. As shown in FIG. 12, the inclined cam surface portion 69 is inclined with respect to the rotation direction Z of the passive rotary body 62. As shown in FIGS. 11 and 12, the positioning surface portion 70 is located on the upstream side of the inclined cam surface portion 69 in the rotation direction of the passive rotor 62. As shown in FIG. 10, the operation pin 73 is supported by the tubular support portion 72 a of the power transmission case 72 so as to be slidable in the radial direction of the passive rotor 62.

  The operation pin 73 is slid toward the passive rotary body 62, and the distal end portion 73a of the operation pin 73 enters the operation recessed portion 68, so that the passive rotary body 62 rotates in the rotation direction Z and operates with the inclined cam surface portion 69. When the tip 73a of the pin 73 abuts and the cutting operation force generated by the cam action of the inclined cam surface 69 causes the passive rotor 62 to slide toward the side away from the drive rotor 61 against the spring 67, and the clutch The main body 63 is turned off. That is, the fractional thread clutch 60 is switched to the disengaged state. When the seedling planting mechanism 12 reaches a rotation phase for stopping, the tip 73a is positioned on the positioning surface 70, and the tip 73a contacts the stopper 71 to position the passive rotor 62.

  The operation pin 73 is slid in a direction away from the passive rotary body 62, and the tip portion 73a is pulled out from the operation recessed portion 68, so that the passive rotary body 62 is slid by the spring 67 toward the drive rotary body 61. The clutch body 63 is in the engaged state. That is, the fractional thread clutch 60 is switched to the engaged state. When the positioning surface portion 70 is inclined with respect to the radial direction of the passive rotary body 62, when the operation pin 73 is operated to come out of the operation recessed portion 68 and the tip portion 73a slides on the positioning surface portion 70, the positioning surface portion 70 Due to the inclination of 70, the passive rotary body 62 may slide toward the drive rotary body 61 by the operating force of the spring 67, and the clutch main body 63 may start to bite by the time the operating pin 73 is completely removed from the operating recessed portion 68. Easy to get out. The positioning surface 70 extends along the radial direction of the passive rotor 62, as shown in FIGS. Accordingly, when the tip portion 73a slides on the positioning surface portion 70, the passive rotary body 62 is not slid toward the drive rotary body 61 by the spring 67. That is, the passive rotary body 62 is slid toward the drive rotary body 61 only after the operation pin 73 has completely slipped out of the operation recessed portion 68, and the clutch body 63 bites before the operation pin 73 slips out of the operation recessed portion 68. The risk of fitting can be reduced.

  FIG. 13 is an explanatory diagram showing the operating position of the work lever 77. As shown in FIG. 13, by operating the working lever 77 to switch between a raised position [raised] and a lowered position [descended], the seedling planting apparatus 10 is lifted and lowered between a non-raising working state and a lowering working state. it can. By operating the work lever 77 to the neutral position [N], the raising and lowering seedling planting device 10 can be stopped at an arbitrary position. By operating the working lever 77 to the first planting position [planting I] after passing the left marker position [left marker] from the descending position [down], the left line drawing marker can be brought into the descending use state. At the same time, the planted clutch 35 can be switched to the on state. By moving the work lever 77 from the lowered position [down] to the right marker position [right marker] to the second planted position [planted II], the right line drawing marker 78 (see FIG. 1) is used for descending. It is possible to put the planting clutch 35 into the engaged state as well as to put the planted clutch 35 into the engaged state.

[Another embodiment]
(1) FIG. 14 is an explanatory view showing the operating position of the work lever 77 of the riding type rice transplanter having another embodiment structure. In the riding type rice transplanter equipped with another implementation structure, the work lever 77 is moved from the lowered position [down] to the left marker position [left marker] and then moved to the planting position [planted] to draw the left line. The marker can be put into the lowered use state and the planting clutch 35 can be switched to the put state. By operating the working lever 77 to the planting position [planting] after passing the right marker position [right marker] from the descending position [Descending], the right line drawing marker 78 can be put down and used. The clutch 35 can be switched to the on state.

(2) In the above-described embodiment, the operation path 43 is configured such that the forward operation area F and the reverse operation area R are displaced in the lateral width direction of the traveling vehicle body 4, and the neutral operation area N is the lateral width of the traveling vehicle body 4. Although the example extending in the direction is shown, the forward operation area F and the reverse operation area R are aligned in the front-rear direction of the traveling vehicle body 4, and the neutral operation area N travels along the forward operation area F and the reverse operation area R. You may employ|adopt the structure extended in the front-back direction of the vehicle body 4.

(3) In the above-described embodiment, the back clutch 31 is provided on the power transmission direction side of the first planted transmission 33, the second planted transmission 34, and the planting clutch 35. Not limited to this, between the first planted transmission 33 and the second planted transmission 34, between the second planted transmission 34 and the planting clutch 35, on the lower side in the transmission direction than the planting clutch 35, and the like. It may be provided at any place.

(4) In the above-described embodiment, the traveling vehicle body 4 is provided with the front wheels 2 and the rear wheels 3, but instead of the wheels, a crawler traveling device, or a traveling device in which the crawler and the wheels are combined, You may implement by providing various traveling devices.

  INDUSTRIAL APPLICABILITY The present invention can be applied to various paddy field working machines provided with various paddy field working units, such as a riding type rice transplanter and a direct seeding machine equipped with a seeding device.

10 Working department (planting equipment)
21 continuously variable transmission 31 back clutch
Reference Signs List 35 clutch with plant 40 gear shift lever 43 operation path 50 clutch control mechanism 52 detector 53 biasing mechanism (spring)
77 Work lever A command area B B command area F Forward operation area N Neutral operation area
R Reverse operation area nf Forward operation neutral position nr Reverse operation neutral position

Claims (2)

A continuously variable transmission that continuously drives the traveling device by shifting the speed,
The driving force is transmitted to the working unit by being switched to the ON state based on the operation of the work lever, and the driving force is transmitted to the working unit by being switched to the OFF state based on the operation of the work lever. A planted clutch that releases power transmission,
Positioned between a forward operation area for shifting the continuously variable transmission to a forward drive state, a reverse operation area for shifting the continuously variable transmission to a reverse drive state, and the forward operation area and the reverse operation area. In addition, a neutral operation range in which the continuously variable transmission is operated to change gears to a neutral state, and a speed change lever that is operated by human operation,
A back clutch that transmits the driving force to the working unit by being switched to the on-state, and releases the transmission of the driving force to the working unit by being switched to the off-state;
A clutch control mechanism that detects the operation position of the shift lever and controls switching of the back clutch based on the detection result;
In the neutral operation range, the speed change lever is operable across a forward operation side neutral operation position facing the forward operation range and a reverse side neutral operation position facing the reverse operation range,
When the shift lever is operated from the neutral operation position on the forward side to the forward operation range and positioned in the forward operation range, the clutch control mechanism controls the back clutch to be switched to the engaged state,
When the shift lever is in the neutral operation range, the clutch control mechanism disengages the back clutch regardless of the movement of the shift lever between the forward neutral position and the reverse neutral position. Control to switch to the state,
The paddy work machine in which the clutch control mechanism controls switching of the back clutch to the disengaged state when the shift lever is located in the reverse operation range. The clutch control mechanism includes a detector provided on the side of the operation path of the shift lever so as to be swingable over a clutch engagement command range and a clutch disengagement command range, and the detection body in the clutch engagement command range. An urging mechanism that oscillates and urges,
When the speed change lever is positioned in the neutral operation range and the reverse operation range, the detection body is rocked in the clutch disengagement command range by being pressed by the speed change lever,
The paddy work machine according to claim 1, wherein when the shift lever is located in the forward operation range, the detection body is operated to swing in the clutch engagement command range by the biasing mechanism.

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