JP6146461B2 - Seedling transplanter - Google Patents

Description

  The present invention relates to a seedling transplanter equipped with a planting device for planting seedlings in a field.

  In the conventional seedling transplanting machine, in a reciprocating planting operation in a farm field, a planting device is controlled by controlling the planting device in conjunction with the turning motion of the machine body, thereby reducing the burden on the operator. In Patent Document 1 below, as a seedling transplanter that can be applied to a wide range of conditions, a control unit having a plurality of swirl patterns provides a planting device in conjunction with the swivel motion of the machine body corresponding to the field situation and work content. A controllable configuration is disclosed.

  According to this configuration, since a preferable turning pattern can be selected when the seedling transplanter turns, a turning operation suitable for the condition is possible.

Japanese Patent No. 4543247

  However, since the seedling transplanter described in Patent Document 1 links the operation control of the planting device with the turning travel of the traveling vehicle body, if the turning trajectory is disturbed, the planting end position of the seedling before the turning and the turning There is a problem that the planting start positions of the subsequent seedlings do not move side by side, and the planting accuracy of the seedlings is lowered.

  In order to prevent this problem from occurring, it is conceivable that the operator manually operates start / stop of traveling and turning on / off of the planting device after turning to change the operation timing. Therefore, it is necessary to quickly start / stop traveling and turn on / off the planting device. This operation requires appropriate skill, and depending on the skill level of the operator, the problem of lowering the seedling planting accuracy cannot be solved.

  The subject of this invention is providing the seedling transplanting machine which can match | combine easily the planting end position of the seedling before turning, and the planting start position of the seedling after turning irrespective of the skill level of an operator.

  The above-described problems of the present invention are solved by the following solution means.

  According to the first aspect of the present invention, a seedling planting part (4) is provided at the rear part of the traveling vehicle body (2) so as to be movable up and down, and a switching device for switching transmission to the traveling vehicle body (2) and the seedling planting part (4). (571), a switching operation member (17) for switching the switching device (571) is provided, a float (55) for grounding on a field scene is provided in the seedling planting part (4), and the float (55 In the seedling transplanting machine provided with the angle detection member (162) for detecting the rotation angle of the planting), a planting operation on / off member (25a) for turning on and off the operation of the seedling planting part (4) is provided, and the switching is performed. When the operation member (17) is operated, a stop planting position (W) is formed in which the planting operation on / off member (25a) is turned on in a state where transmission to the traveling vehicle body (2) is cut off. Stop planting position detection member (430) that detects the operation of the switching operation member (17) to the attachment position (W) Even if the stop planting position detection member (430) is in the detection state, and when the detection angle of the angle detection member (162) is outside the range of a predetermined angle, the planting operation on / off member A seedling transplanter provided with a control device (163) for turning off (25a).

According to the second aspect of the present invention, an engine (20) is provided on the traveling vehicle body (2), and a seedling planting portion (4) is provided at a rear portion of the traveling vehicle body (2) so as to be movable up and down, and the traveling vehicle body (2) and A switching device (571) for switching transmission to the seedling planting unit (4) is provided, a switching operation member (17) for switching the switching device (571) is provided, and a field scene is provided in the seedling planting unit (4). A float (55) for grounding is provided,
In the seedling transplanting machine provided with an angle detection member (162) for detecting the rotation angle of the float (55), a planting operation on / off member (25a) for turning on / off the operation of the seedling planting portion (4) is provided. A continuously variable transmission (23) that transmits power from the engine (20) to the auxiliary transmission (571), a main transmission operating member (16) that performs a shift operation of the continuously variable transmission (23), and A main transmission operation position detection member (16b) for detecting the operation of the main transmission operation member (16) is provided, and the output of the continuously variable transmission (23) is detected based on the detection of the main transmission operation position detection member (16b). A control device (163) to be changed is provided, and in the control device (163), the main transmission switching operation member (16) stops the output of the continuously variable transmission (23) by the main transmission operation position detection member (16b). Detecting operation to neutral position And which, detect and when that, before Symbol SWITCHING operating member (17) and with stop planting position that rotation angle is within a predetermined angular range of the float (55) by the angle detecting member (162) ( It is a seedling transplanting machine which makes the said planting operation on / off member (25a) into an ON state if operated to W).

  According to a third aspect of the present invention, the continuously variable transmission (23) is provided with a trunnion shaft (295) for changing the output of the continuously variable transmission (23), and the trunnion for rotating the trunnion shaft (295). A shaft actuator (103) is provided, a trunnion shaft detection member (113) for detecting the rotational position of the trunnion shaft (295) is provided, and the control device (163) includes the main transmission operation position detection member (16b). When the operation to the neutral position of the main transmission switching operation member (16) is detected and the operation of the trunnion shaft detection member (113) to the neutral position of the trunnion shaft (295) is detected, the planting operation on / off member is detected. The seedling transplanter according to claim 2, wherein (25a) is turned on.

  According to a fourth aspect of the present invention, when the switching operation member (17) is operated, the switching device (571) is switched to a state where transmission to the traveling vehicle body (2) is cut off, and the planting operation on / off member ( 25a) is formed in a neutral operation position (N), the stop operation position (W) is formed on the left and right sides of the neutral operation position (N), and the switching operation member (17) is The seedling transplanter according to claim 1 or 2, further comprising an urging member that urges toward a neutral operation position (N).

According to the first aspect of the invention, that float (55) is grounded when the angle detecting member (162) is not detected, the operation to stop the planting position SWITCHING operating member (17) (W) during turning Even if the planting operation on / off member (25a) is not switched to the on state, the seedling planting unit (4) operates above the farm scene and drops the seedling due to an erroneous operation of the switching operation member (17). This prevents the consumption of excess seedlings.

According to the second aspect of the invention, the main transmission switching operation member (16) is operated to the neutral position, and only when the float (55) is a ground state, stops the switching exchange operation member (17) planted By operating the attachment position (W), the seedling planting section (4) is operated above the farm scene to drop the seedling by moving the planting operation on / off member (25a) to the on state, Since the planting of the seedling while the vehicle body (2) is moving can be prevented, the seedling can be reliably planted at a necessary position, and the planting accuracy of the seedling is improved.

  According to the third aspect of the present invention, in addition to the effect of the second aspect of the invention, the planting operation is turned on only when both the main shift switching operation member (16) and the trunnion shaft (295) are in the neutral position. By setting the cutting member (25a) to the on state, the seedling planting part (4) can be operated only in a state where the traveling power to the traveling vehicle body (2) is not transmitted, so that the traveling vehicle body (2) moves. Therefore, planting seedlings is prevented, so that seedlings can be planted reliably at the necessary positions, and seedling planting accuracy is improved.

  According to the invention of claim 4, in addition to the effect of the invention of claim 1 or 2, by biasing the switching operation member (17) toward the neutral operation position (N) with the biasing member. Since the switching operation member (17) does not move to the stop planting position (W) unless the operator deliberately operates, it is prevented from starting planting of seedlings on the spot due to an erroneous operation. Consumption is prevented.

  Moreover, since it can prevent planting a seedling in the position which does not need to plant, the planting precision of a seedling improves.

Side view of riding rice transplanter Top view of riding rice transplanter The perspective view which shows the steering structure of the right-and-left front wheel of a riding type rice transplanter (A) Plan view of display panel of riding type rice transplanter, (b) Plan view of operation panel Block diagram of control device for riding rice transplanter Schematic plan view showing the transmission configuration of a riding rice transplanter Schematic plan view showing the drive force transmission structure inside the left rear gear case of the riding rice transplanter Schematic plan view showing the drive force transmission structure inside the right rear wheel gear case of the riding rice transplanter Flow chart of control device for riding rice transplanter Plan view showing the transmission mechanism to the drive wheels in the mission case of a riding rice transplanter Operation explanatory diagram of the sub-transmission mechanism in the mission case of the riding rice transplanter Transmission mechanism diagram of the operation position (road speed) of the sub-shift switching operation member Transmission mechanism diagram of the operation position (planting work speed) of the auxiliary gear change switching operation member Transmission mechanism diagram of the operation position (neutral) of the sub-transmission switching operation member Transmission mechanism diagram of the operation position (stop planting) of the sub-transmission switching operation member Flow chart of control device of another configuration example Flow chart of control device of another configuration example Flow chart of control device of another configuration example Flow chart of control device of another configuration example Flowchart of stop planting function of riding type rice transplanter control device Flow chart of stop planting process 0 Flow chart of stop planting process 1 Flow chart of stop planting process 2 Flow chart of stop planting process 3 Flowchart of stop planting process 4 Flowchart summarizing FIGS. 21 to 25 Flowchart summarizing FIGS. 21 to 25 Hydraulic circuit diagram of continuously variable transmission of riding type rice transplanter Side sectional view of continuously variable transmission Cross section of continuously variable transmission Enlarged view of piston part of continuously variable transmission Piston part of continuously variable transmission of another configuration example

  Embodiments of the present invention will be described as follows.

  1 and 2 show a left side view and a plan view of an 8-row riding rice transplanter as a seedling transplanter of the present embodiment. In this specification, the left and right are defined as left and right, respectively, and the front and rear are defined as front and rear, respectively, in the forward direction of the rice transplanter 1.

  In this rice transplanter 1, a seedling planting portion 4 is mounted on the rear side of the traveling vehicle body 2 via an elevating link mechanism 3 so as to be movable up and down, and a main body portion of the fertilizer device 5 is provided on the rear upper side of the traveling vehicle body 2. . The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 as drive wheels, and a transmission case 12 is disposed at the front of the fuselage. A front wheel final case 13 is provided on the left and right sides of the case 12, and a pair of left and right front wheels 10 and 10 are respectively attached to left and right front wheel axles that project outward from a front wheel support portion of the left and right front wheel final case 13.

  Further, the traveling vehicle body 2 has a main frame 15 having a front end portion fixed to the rear surface portion of the transmission case 12 and a base frame disposed in the left-right direction of the traveling vehicle body 2 constituting the rear portion of the main frame 15. 100 (FIG. 2) and a pair of left and right link base frames 42L and 42R that rise upward from both ends of the base frame 100 and are connected to the front end of the lift link mechanism 3.

  Further, on the left and right sides of the rear part of the traveling vehicle body 2, a left rear gear case 200 </ b> L that houses a transmission mechanism for transmitting a driving force from the engine 20 to the left and right rear wheels 11, 11, and a right rear wheel gear case 200 </ b> R. Is arranged.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission case 12 via a belt transmission 21 and a continuously variable transmission 23 as a main transmission. Then, the rotational power transmitted to the mission case 12 is taken out by the auxiliary transmission device (switching device) 571 (FIG. 10) in the mission case 12 while being separated into traveling power and external extraction power. In the auxiliary transmission 571, the output of traveling power from the engine 20 to the front wheels 10, 10 and the rear wheels 11, 11 is changed.

  A part of the driving power is transmitted to the front wheel final case 13 to drive the pair of left and right front wheels 10 and 10, and the remaining part of the driving power is left rear gear case 200L via the first transmission shaft 230L, And the right rear wheel gear case 200R via the second transmission shaft 230R to drive the pair of left and right rear wheels 11, 11.

  A part of the traveling power transmitted to the left rear gear case 200L is planted through a leveling clutch mechanism 320 (FIGS. 6 and 7) provided in the left rear gear case 200L. It is transmitted to the leveling rotor 27 (the combination of the first leveling rotor 27a and the second leveling rotor 27b may be simply referred to as leveling rotor 27) attached to the section 4. The leveling clutch mechanism 320 will be described later with reference to FIG.

  Further, a part of the traveling power transmitted to the right rear wheel gear case 200R is transferred to the fertilizer application device 5 via the fertilizer transmission mechanism 420 (FIGS. 6 and 8) provided in the right rear wheel gear case 200R. Be transmitted. The fertilizer transmission mechanism 420 will be described later with reference to FIG.

  The external take-out power is transmitted to a planting clutch case 25 provided at the rear part of the traveling vehicle body 2, and then transmitted to the seedling planting unit 4 by a planting transmission shaft 26.

  The upper part of the engine 20 is covered with an engine cover 30, and a cockpit 31 is installed thereon. A front cover 32 incorporating various operation mechanisms is provided in front of the cockpit 31, and a turning operation member 34 for steering the left and right front wheels 10 and 10 is provided above the front cover 32.

  A main shift switching operation member 16 that switches the output of the continuously variable transmission 23 is provided in the vicinity of the cockpit 31 and is rotated in the front-rear direction along the lever guide 16a (FIG. 4). The trunnion shaft 295 (FIG. 30) for changing the inclination angle of the swash plate 69 (FIG. 29) for adjusting the hydraulic pressure output from the step transmission 23 can be rotated, thereby changing the output of the continuously variable transmission 23. Thus, the traveling vehicle body 2 can be moved forward and backward (start), stopped (neutral), and accelerated and decelerated.

  The operation position of the main transmission switching operation member 16 is detected by a main transmission operation amount detection member 16b provided at the base of the main transmission switching operation member 16. 5 is continuously variable by the trunnion shaft electric motor 103 shown in FIG. 5 by the control device 163 according to the operation amount and the operation direction from the neutral position 16aa (FIG. 4) detected by the main transmission operation amount detection member 16b (FIG. 5). The trunnion shaft 295 of the device 23 is rotated. By changing the inclination angle of the swash plate 69 according to the rotation angle of the trunnion shaft 295, the output of the continuously variable transmission 23 can be changed continuously. The trunnion shaft electric motor 103 operates in the forward direction with forward rotation and the reverse side with reverse rotation.

Further, the sub-transmission device 571 is moved on the road speed (high speed) by moving the switching operation member (hereinafter referred to as sub-transmission switching operation member) 17 (FIG. 2) along the lever guide 17a (FIG. 4). ), A planting work speed (low speed) position for work, and a neutral position not transmitted to the traveling system. The operation position of the auxiliary transmission switching operation member 17 is detected by an auxiliary transmission operation position detection member 17b (FIG. 5) provided at the base of the auxiliary transmission switching operation member 17.

  The engine cover 30 and the front cover 32 have horizontal floor steps 35 on the left and right sides of the lower end. The floor step 35 is partly grid-shaped (see FIG. 2), and mud on the shoe of the worker walking on the floor step 35 falls into the field.

  The elevating link mechanism 3 has a parallel link configuration and includes one upper link 40 and a pair of left and right lower links 41. The upper link 40 and the lower link 41 are rotatable to a pair of left and right link base frames 42L and 42R that form a rear-view portal frame with their base sides standing on the base frame 100 at the rear end of the main frame 15. The vertical link 43 is connected to the tip side. And the connecting shaft 44 rotatably supported by the seedling planting part 4 is inserted and connected to the lower end part of the vertical link 43, and the seedling planting part 4 is connected so as to be able to roll around the connecting shaft 44.

  An elevating hydraulic cylinder 46 is provided between a support member fixed to the main frame 15 and a tip of a swing arm (not shown) integrally formed with the upper link 40, and the elevating hydraulic cylinder 46 is expanded and contracted hydraulically. The upper link 40 pivots up and down, and the seedling planting part 4 moves up and down while maintaining a substantially constant posture.

  The seedling planting section 4 has an eight-row planting structure, a planting transmission case 50 that also serves as a frame, a mat seedling, and a left and right reciprocating motion to feed the seedlings one by one to the seedling outlet 51a of each row. When all the seedlings for one row are supplied to the seedling outlet 51a, a seedling stand (seedling placement unit) 51 for transferring the seedlings downward by the seedling feeding belt 51b, and the seedlings supplied to the seedling outlet 51a are used as the seedling planting tool 52a. Is provided with a planting device 52 and the like for planting in the field.

  In the lower part of the seedling planting part 4, a float 55 is provided in the center, and a middle float 57 and a side float 56 are provided on the left and right sides thereof. When the aircraft is advanced with these floats 55, middle floats 57 and side floats 56 in contact with the mud surface of the field, the floats 55, middle floats 57 and side floats 56 slide while leveling the mud surface. A seedling is planted by the planting device 52 on the leveling mark.

  The float 55, the middle float 57, and the side float 56 are attached so that the front end side is rotatable in the vertical direction corresponding to the unevenness of the field topsoil surface, and the vertical movement of the front part of the float 55 is caused during the planting operation. By detecting the angle detection member 162 provided on the front upper part of the float 55 and switching the electromagnetic hydraulic valve 161 (FIG. 5) that controls the lifting hydraulic cylinder 46 in accordance with the detection result, the seedling planting part 4 is raised and lowered. Keep the seedling planting depth constant.

  The fertilizer applicator 5 feeds granular fertilizer stored in a fertilizer tank 60 by a certain amount by a feeding unit 61 and applies the fertilizer to the left and right sides of the float 55, middle float 57, and side float 56 with a fertilizer hose 62. It guides to a guide (not shown), and is configured to be dropped into a fertilization structure formed in the vicinity of the side portion of the seedling planting line by a grooved body 64 provided on the front side of the fertilization guide. The air generated by the blower 58 driven by the blower electric motor 53 is blown into the fertilizer hose 62 via the air chamber 59 that is long in the left-right direction, and the fertilizer in the fertilizer hose 62 is conveyed by wind pressure. Yes.

  In addition, the seedling platform 51 is configured to slide in the left-right direction, and a pair of spare seedling frames 38, 38 on which supplementary seedlings are placed are provided on the left and right sides of the front part of the traveling vehicle body 2.

  FIG. 3 is a perspective view showing the steering structure of the left and right front wheels 10 and 10 of the riding type rice transplanter shown in FIG. A configuration of a portion where the left and right front wheels 10 and 10 are steered by the turning operation member 34 will be described.

  The turning operation member 34 is fixed to the upper part of the steering shaft provided in the front cover 32, and the rotation of the steering shaft is decelerated via a steering transmission gear provided in the transmission case 12 and transmitted to the output shaft 174. Is done. And the lower end of the output shaft 174 protrudes from the bottom face of the mission case 12, and the pitman arm 175 is fixed. The front left and right sides of the pitman arm 175 and the left and right front wheel final cases 13 and 13 are connected by left and right rods 176 and 176 (FIG. 1).

  Accordingly, when the turning operation member 34 is rotated, the steering shaft, the steering transmission gear, the output shaft 174, the pitman arm 175, the left and right rods 176 and 176, and the left and right front wheel final cases 13 and 13 are transmitted to the left and right The front wheels 10, 10 are steered left and right.

  On the other hand, an operating roller 177 is rotatably provided on the upper surface of the rear portion of the pitman arm 175. A notch 178 that is cut out in a U shape in plan view and surrounds the left and right sides of the operating roller 177 is provided. A follower 179 having the transmission case 12 is rotatably supported on the bottom surface of the mission case 12.

  The left and right sides of the driven body 179 are connected to left and right side clutch operation arms 86 and 86 for operating the left and right side clutches 87 and 87 of the side clutch shafts 586 and 586 (FIG. 10) of the left and right rear wheels 11, respectively. The front portions of the left and right rods 180, 180 are connected. Note that the left and right side clutches 87, 87 are always engaged.

  Therefore, if the turning operation member 34 is turned to the right by a predetermined amount (an amount that the operator turns to the right with the intention of turning the aircraft to the right, for example, 200 degrees), the pitman arm 175 is also turned to the right and operated. In order for the roller 177 to rotate in the (c) direction and push the left side surface 178a of the notch 178 of the driven body 179, the driven body 179 is rotated in the (d) direction to pull the right rod 180 and the right side clutch operation arm. 86 is operated and the right side clutch 87 is disengaged.

  The turning operation member 34, the output shaft 174, the pitman arm 175, the operating roller 177, the driven body 179, the rod 180, the side clutch operation arm 86 for clutch interlocking, and the like are referred to as a steering mechanism S. Since the right rear wheel 11 on the turning center side is in an idle state, the right rear wheel 11 does not damage the cultivator, and the mud surface is not roughened by lifting a large amount of mud, so that the right turning can be performed. It can be done smoothly.

  On the contrary, when the turning operation member 34 is turned to the left by a predetermined amount or more, the pitman arm 175 is also turned to the left, and the operating roller 177 is turned in the opposite direction to (C), so that the right side of the notch 178 of the driven body 179 In order to push the surface 178b, the follower 179 is rotated in the direction opposite to (d), the left rod 180 is pulled, the left side clutch operation arm 86 is operated, the left side clutch 87 is disengaged, and the left rear on the turning center side Since the wheel 11 is in the idle state, the left rear wheel 11 is prevented from damaging the tiller, and the left turn can be smoothly performed without lifting the mud and making the mud surface rough.

  As described above, at the time of turning, the side clutch 87 outside the turning is kept in the on state, but only the side clutch 87 inside the turning can be turned off.

  FIG. 4A shows an example of a plan view of the display panel 80, and FIG. 4B shows an example of a plan view of the operation panel 70. FIG. 5 shows a block diagram of the control device 163 of the rice transplanter 1 in FIG.

  And in the rice transplanter 1 of this embodiment, the operation panel 70 which arrange | positioned various switches, buttons, dials, etc. in the vicinity of the turning operation member 34 of the front cover 32 upper part is provided, and also on the operation panel 70 of the rice transplanter 1 A display panel 80 is provided for displaying work information such as a driving operation position, work, and operation control state.

  As shown in FIG. 4, the main shift switching operation member 16 is arranged on the right side as viewed from the cockpit 31, the auxiliary transmission switching operation member 17 is arranged on the left side, and each saddle clutch (not shown) is arranged on the lower side. A saddle clutch switch 82 to be turned on and off is arranged.畦 Clutch switch 82 has 1 and 2 畦 clutch switches 82a and 3 and 4 畦 clutch switches 82b on the left, and 5 and 6 畦 clutch switches 82c and 7 and 8 on the right. A saddle clutch switch 82d is arranged.

  In addition, on the right side of the guide 17a of the auxiliary transmission switching operation member 17, a turning interlock switch 90 for turning on and off a turning interlocking mode in which the operation of the seedling planting unit 4 and the operation of the fertilizer application device 5 are automatically performed in accordance with the turning. On the upper side of the swivel interlocking switch 90, a planting start adjustment dial 92, a leveling rotor height adjustment dial 94, and the like are arranged.

  “Plant” on the upper side of the monitor 83 of the display panel 80 lights up when the planting operation on / off member 25a in the planting clutch case 25 is turned on, and the turning interlock lamp 84 lights up when the turning interlocking mode is on. To do. The on / off state of the planting operation on / off member 25a is detected by the planting operation detecting member 25ab. Further, the turn interlocking lamp 84 displays “turn” as an example. Further, a lamp that is turned on when the hook clutch is disengaged, when the fertilizer from the fertilizer application device 5 is clogged, or when the fertilizer is exhausted is provided.

  When the turning interlock mode is set by the turning interlock switch 90, the turning interlock mechanism T functions. Specifically, when the turning operation member 34 is operated and the turning traveling is started, the turning interlock mechanism T is operated to switch the electromagnetic hydraulic valve 161 by the control device 163 to contract the lifting hydraulic cylinder 46 and raise the seedling planting unit 4. Let Then, counting of the rotational speed difference between the left and right rear wheel rotation sensors 205 and 205 provided on the rear wheel shaft 341 is started, and the left and right rear wheel rotation sensors 205 and 205 are operated after the turning operation member 34 is operated to the turning end side. When the difference in the rotational speed of 205 becomes less than a certain value, the control device 163 switches the electromagnetic hydraulic valve 161 to extend the lifting hydraulic cylinder 46 to lower the seedling planting unit 4 and to move the left and right rear wheel rotation sensors 205, 205. This is a mechanism for bringing the planting operation on / off member 25a into an on state when the number of rotations reaches a predetermined number. Further details will be described below.

  First, when the operator rotates the turning operation member 34 to the left or right by 200 degrees (the turning operation member 34 rotates 360 degrees to 400 degrees to the left and right), the turning traveling starts. The turning start timing is calculated by the control device 163 based on the detection result of the turning direction detecting member 193 of the turning operation member 34. The turning direction detection member 193 can detect not only the steering angle of the turning operation member 34 but also the turning direction. The turning direction detection member 193 is a potentiometer provided on the steering shaft of the turning operation member 34.

  When turning is started, a signal is output from the control device 163 to control an electromagnetic solenoid (not shown) that operates the electromagnetic hydraulic valve 161 to raise the seedling planting unit 4 and to turn off the planting clutch motor 24. The planting operation on / off member 25a is cut to the side. Further, the steering mechanism S disengages the side clutch 87 on the inner side of the turn among the left and right side clutches 87 and 87 (FIG. 10) built in the transmission case 12.

  Then, counting of the rotational speed difference between the left and right rear wheel rotation sensors 205 and 205 is started, and after the turning operation member 34 is operated to the turning end side, the side clutch 87 inside the turning is engaged and the left and right rear wheels 87 are turned on. When the rotational speed difference between the wheel rotation sensors 205 and 205 becomes less than a certain value, the control device 163 controls the electromagnetic solenoid that operates the electromagnetic hydraulic valve 161 to lower the seedling planting unit 4 and rotate the left and right rear wheels. When the number of rotations of the sensors 205 and 205 reaches a predetermined number of rotations, the planting clutch motor 24 is actuated to the entry side to set the planting operation on / off member 25a.

  When the planting operation on / off member 25a is in the on state, the seedling planting tool 52a of all planting strips is activated, and the seedling platform 51 also starts to move left and right. The seedling feeding belt 51b for all planting strips operates. As a transmission mechanism, it is transmitted from the planting operation on / off member 25a to the seedling planting part 4 by the planting transmission shaft 26, and to each of the corresponding seedling planting tools 52a via each heel clutch in the seedling planting part 4. In the seedling planting portion 4, the power is transmitted to the corresponding seedling feeding belts 51b via the seedling feeding clutches (not shown). As described above, seedling planting is automatically started without operating the seedling planting lever 19 (FIG. 2).

  In addition, although the fertilizer 5 operates also in conjunction with the raising / lowering of the said seedling planting part 4, the structure is mentioned later.

  Next, the transmission configuration of the driving force transmitted from the transmission case 12 side in the left rear gear case 200L will be described with reference to FIGS. FIG. 6 is a schematic plan view showing transmission configurations in the transmission case 12, the left rear wheel gear case 200L, and the right rear wheel gear case 200R, and FIG. 7 is an enlarged view of the left rear wheel gear case 200L in FIG. is there. 6 and 7, the front side, rear side, left side, and right side of the traveling vehicle body 2 are represented by arrows F, B, L, and R, respectively. The same applies to FIG. 8 described later.

  As shown in FIGS. 6 and 7, power is transmitted from the transmission case 12 side to the first input shaft 321L via the first transmission shaft 230L to the leveling clutch mechanism 320 including the first input shaft 321L. The power is transmitted from the first bevel gear 321aL on the rear end side of the first input shaft 321L to the second rotating shaft 340L to which the second bevel gear 330L is fixed, and the small diameter is fixed to the second rotating shaft 340L. The left rear wheel shaft 341L is rotated by being transmitted to the large-diameter gear 332L via the gear 331L.

  Next, the construction of turning on and off the driving force to the rotor transmission shaft 301 by the leveling clutch mechanism 320 will be described.

  The leveling clutch mechanism 320 includes a first input shaft 321L, a leveling rotor on / off clutch 322 slidably connected to the first input shaft 321L, and a leveling rotor on / off clutch 322 on the first bevel gear 321aL side. A biasing spring 323 that constantly biases and a protrusion 324aL that pushes the flange 322a of the leveling rotor on / off clutch 322 against the biasing force of the biasing spring 323 are provided at the tip, as shown in FIG. A shift shifter 324L that shifts the leveling rotor on / off clutch 322 in the direction of arrow E along the axial direction of the shaft 321L and the first input shaft 321L are loosely fitted to the first bevel gear 321aL side of the leveling rotor on / off clutch 322. A first gear 325 is provided.

  A plurality of first clutch pawls 322b are formed on the surface of the leveling rotor on / off clutch 322 on the first gear 325 side, and the surface of the first gear 325 on the leveling rotor on / off clutch 322 side has a first clutch. A plurality of second clutch claws 325a are formed so as to be engaged with the claws 322b. Then, the transmission power generated by the rotation of the first gear 325 is transmitted to the second gear 312 fixed to the rotor transmission shaft 301 via the chain 311. Thereby, driving force is transmitted to the leveling rotor 27 side.

  Further, the base portion 324b side of the switching shifter 324L is connected to a switching interlocking mechanism 326a that is provided on the traveling vehicle body 2 side of the lifting / lowering link mechanism 3 and is composed of a rod, a wire, a spring, and the like. When the seedling planting part 4 is lifted by turning or reversing the airframe or by an operator's operation, when the lifting link mechanism 3 moves upward to a predetermined height, the switching interlock mechanism 326a operates the switching shifter 324L, and the leveling clutch The mechanism 320 is turned off. Thereby, when the seedling planting part 4 rises, the driving of the leveling rotor 27 can be stopped.

  Further, as described above, if the rotor transmission shaft 301 that transmits the driving force to the leveling rotor 27 side is disposed inside the fuselage, the rotor transmission shaft 301 is located on the inner side of the left rear wheel gear case 200L, and the Since the left rear wheel gear case 200L is disposed at a position separated from the left rear wheel 11 located on the outer side of the machine body, mud soil splashed by the rotation of the rear wheel 11 is received by the left rear wheel gear case 200L, and the rotor It becomes difficult to scatter to the transmission shaft 301, and the oil seal of the rotor transmission shaft 301 is prevented from being damaged.

  Lubricating oil for the internal gear mechanism is sealed in the left rear wheel gear case 200L, and an oil seal is provided at a location where the rotor transmission shaft 301 protrudes. If this oil seal is broken, there is a risk that the lubricating oil may come out with the rotation of the rotor transmission shaft 301, but the lubricating oil is difficult to leak out due to the above configuration.

  Further, the rotor transmission shaft 301 may be disposed below the left rear gear case 200L. Thereby, it becomes close to the height at the time of operation of the leveling rotor 27 below the left rear wheel gear case 200L, and transmission loss of driving force can be prevented.

  On the other hand, the rotor transmission shaft 301 may be disposed above the left rear wheel gear case 200L. This makes it difficult for mud to splash on the rotor transmission shaft 301, preventing the oil seal from being damaged by the mud and improving the durability of the rotor transmission shaft 301.

  Next, the transmission configuration in the right rear wheel gear case 200R of the driving force transmitted from the mission case 12 side will be described with reference to FIGS. FIG. 8 is a schematic plan view showing a driving force transmission configuration inside the right rear wheel gear case 200R.

  As shown in FIG. 6, in the fertilization transmission mechanism 420, power is transmitted from the mission case 12 side to the second input shaft 321R via the second transmission shaft 230R. The power is transmitted from the first bevel gear 321aR on the rear end side of the second input shaft 321R to the second rotating shaft 340R to which the second bevel gear 330R is fixed, and the small diameter is fixed to the second rotating shaft 340R. The right rear wheel shaft 341R is rotated by being transmitted to the large-diameter gear 332R via the gear 331R.

  Next, the structure of turning on and off the driving force to the fertilization transmission member 401 by the fertilization transmission mechanism 420 will be described.

  The fertilization transmission mechanism 420 includes a second input shaft 321R, a fertilization transmission on / off member 422 slidably connected to the second input shaft 321R, and a fertilization transmission on / off member 422 on the first bevel gear 321aR side. A fertilizer biasing spring 423 that constantly biases to the opposite side and a protrusion 324aR that pushes the fertilizer trough 422a of the fertilizer transmission on / off member 422 against the biasing force of the fertilizer biasing spring 423 are provided at the tip, as shown in FIG. As shown, the shift shifter 324R that shifts the fertilization transmission on / off member 422 in the direction of arrow E along the axial direction of the second input shaft 321R and the second input shaft 321R are loosely fitted to the fertilizer transmission on / off member 422. A third bevel gear 425 provided on the opposite side of the one bevel gear 321aR is provided.

  A plurality of third clutch claws 422b are formed on the surface of the fertilization transmission on / off member 422 on the third bevel gear 425 side, and the surface of the third bevel gear 425 on the fertilization transmission on / off member 422 side is A plurality of fourth clutch claws 425a are formed so as to be fitted to the three clutch claws 422b.

  Further, the root portion 324bR of the switching shifter 324R is connected to a fertilization transmission actuator 426a that switches the driving force of the fertilizer application device 5 via a cable 427, and in conjunction with the raising and lowering of the seedling planting unit 4, the fertilization transmission actuator 426a. Thus, the fertilization transmission on / off member 422 is switched.

  The control device 163 is configured to operate the planting clutch motor 24 in accordance with the raising and lowering of the seedling planting unit 4 and to operate the fertilization transmission actuator 426 a in accordance with the operation of the planting clutch motor 24. However, when the seedling planting part 4 is lowered (at the time of planting), the fertilization transmission actuator 426a is turned on and off by the fertilization transmission switch 428 as shown in FIG. The configuration is as follows.

  When the switching shifter 324 is switched to one side, that is, the right side of FIG. 8 by the fertilization transmission actuator 426a, the fertilization transmission on / off member 422 is switched to the same direction, that is, the right side of FIG. Since the engagement of the 4-clutch pawl 425a is released, the driving force generated by the rotation of the input shaft 321 is not transmitted to the third bevel gear 425. Therefore, the driving force is not transmitted to the fertilizer application 5 side.

  On the other hand, as shown in FIG. 8, when the switching shifter 324 is switched to the other side, that is, the left side of FIG. 8 by the fertilization transmission actuator 426a, the fertilization transmission on / off member 422 is switched to the same direction, that is, the left side of FIG. Since the third clutch pawl 422b and the fourth clutch pawl 425a are fitted, the driving force generated by the rotation of the input shaft 321 is transmitted to the third bevel gear 425. Then, the power transmitted by the rotation of the third bevel gear 425 is transmitted to the fourth bevel gear 412 fixed to the fertilization transmission member 401. Thereby, driving force is transmitted to the fertilizer application 5 side.

  Note that the right rear wheel gear case 200R and the left rear wheel gear case 200L may be interchanged, and the right rear wheel gear case 200R is provided with a leveling clutch mechanism 320, and the left rear wheel gear case 200L A fertilizer transmission mechanism 420 may be provided.

  In the rice transplanter 1, when it is detected that the angle detection member 162 has an angle that can be regarded as being in contact with the agricultural field, the entire area before and after the float 55 is detected when the turning interlocking mechanism T functions. The fertilizer transmission actuator 426a of the fertilizer applicator 5 switches the fertilizer transmission on / off member 422 to the on state, and the fertilizer applicator 5 is driven. Further, when the fertilizer transmission on / off member 422 is turned on, the blower electric motor 53 is also operated at the same time, thereby generating fertilizer transport air and improving the fertilizer transport efficiency.

  Further, when it is detected by the angle detection member 162 that the float 55 is separated from the field scene, that is, when the ground contact is not detected, the fertilization transmission on / off member 422 is cut by the fertilization transmission actuator 426a, and the blower The electric motor 53 operates in conjunction with each other, and the fertilizer application device 5 is not driven. The flowchart at this time is shown in FIG.

  When it is detected by the angle detection member 162 that the float 55 is in contact with the farm scene, the on / off state of the fertilization drive at that time is determined, and the state is maintained as it is when the fertilizer application 5 is operating. On the other hand, when the fertilizer application 5 is not operating, the drive is switched to operate the fertilizer transmission actuator 426a.

  In addition, when the angle detection member 162 does not detect that the float 55 is in contact with the farm scene, that is, when the separation is detected, the fertilizer application device 5 is activated by determining the on / off state of the fertilizer driving at that time. If so, switch the drive to stop. On the other hand, when the fertilizer 5 is not operating, the state is maintained as it is. The fertilization drive on / off state is determined by providing a fertilizer transmission on / off member 422 with a sensor (not shown) that detects the on / off state of the fertilization transmission on / off member 422 and the on / off state of the fertilization transmission switch 428. And

  The angle at which the float 55 is considered to be separated from the farm scene by the angle detection member 162 is, for example, −3 to 5 degrees when the entire area before and after the float 55 is in contact with the farm scene is ± 0 degrees (reference value). This should be done. Since the up / down pivot point of the float 55 is at the rear part of the float, this angle is expressed by the idea that the front end of the float 55 is negative when it is lowered from the reference value, and positive when it is raised.

  When the angle detection member 162 detects that the float 55 is separated from the farm scene, the fertilizer 5 stops, and when the seedling planting unit 4 starts to rise, the supply of fertilizer from the fertilizer 5 stops. The fertilizer is prevented from being released at a position away from the surface, and excessive diffusion of the fertilizer is prevented.

  Further, when the angle detection member 162 detects that the float 55 is in the ground contact state, the fertilizer application device 5 is activated so that the fertilizer application device 5 is activated prior to the start of planting of the seedling after turning. Since the feeding of the fertilizer can be started, the fertilizer is supplied to the field at the start of planting of the seedling after turning. Therefore, the generation | occurrence | production of the area where fertilizer is not supplied is prevented. Further, since the fertilizer is supplied in a state where the float 55 is grounded, the fertilizer is not sprinkled into the air.

  In addition, regarding the stoppage of the operation of the fertilizer application device 5 when the seedling planting unit 4 is raised, the planting operation on / off member 25ab that detects the on / off of the planting operation on / off member 25a is used instead of the angle detection member 162. When the cutting state of the planting operation on / off member 25a is detected, the fertilizer transmission actuator 426a may be in a cut state so that the operation of the fertilizer applying device 5 is stopped.

  By stopping the fertilizer 5 after stopping the planting device 52 in which the planting operation on / off member 25a is cut, the seedling planting unit 4 transfers the fertilizer being transferred from the fertilizer hose 62 of the fertilizer 5 to the field scene. Since it can be supplied to the field while ascending to the maximum position, it is prevented that fertilizer is supplied more than necessary at the start of fertilizer supply after turning, and supply of excess fertilizer is prevented.

  In addition, when the seedling planting unit 4 is lowered, as described above, when the angle detection member 162 detects that the float 55 is in a grounded state, the fertilizer application device 5 is activated to generate a section in which no fertilizer is supplied. And fertilizer is prevented from spreading in the air and spreading.

  Although these controls are performed by the control device 163, the operation stoppage of the fertilizer device 5 when the seedling planting unit 4 is raised is based on the result detected by the angle detection member 162 or by the planting operation on / off member 25ab. Whether to be based on the detected result can be selected by the operator according to the work condition, the field condition, and the like by a selection switch 432 provided on the operation panel 70 shown in FIG. When the selection switch 432 is operated to the left side, the configuration is based on the result detected by the planting operation on / off member 25ab based on the result detected by the angle detection member 162, and when operated to the right side.

  As described above, the fertilization transmission mechanism 420 and the fertilization transmission member 401 are provided on the left and right rear wheel gear cases 200 (right rear wheel gear case 200R in the illustrated example), and the planting clutch case 25 and planting The fertilization transmission mechanism independent of the planting transmission mechanism to the seedling planting part 4 via the transmission shaft 26 is comprised.

  That is, since the turning on / off of the drive of the fertilizer 5 can be performed independently, the start and end of the fertilizer supply can be operated regardless of the turning on / off of the planting device 52, Occurrence of sections where no fertilizer is supplied is prevented.

  A fertilizer transmission switch 428 for turning on and off the fertilizer transmission mechanism 420 is provided on the operation panel 70, and the fertilizer transmission actuator 5 can be operated by the fertilizer transmission actuator 426a when the operator presses the fertilization transmission switch 428. .

  Then, based on the on / off operation of the fertilization transmission switch 428, the detection result by the angle detection member 162, the detection result by the planting operation on / off member 25ab, etc., the fertilization transmission actuator 426a is operated to perform on / off of the fertilization transmission mechanism 420. Thus (fertilization transmission function), the on / off of the fertilization transmission mechanism 420 is easily automated, so that the working efficiency is improved and the on / off of the fertilizer 5 is reliably performed.

  And as shown in FIG. 6, the fertilization transmission member 401 which transmits a driving force to the fertilizer application apparatus 5 side is arrange | positioned inside the body, ie, the opposite side to the side which provides the rear wheel 11 on the basis of the right rear wheel gear case 200R. As a result, the mud that is flipped up by the rotation of the rear wheel 11 is received by the outer surface of the right rear wheel gear case 200R, so that mud is prevented from adhering to the fertilizer transmission member 401.

  On the other hand, the fertilizer transmission member 401 is arranged on the outer side of the machine body, that is, the fertilizer transmission member 401 is arranged on the rear wheel 11 side (right side) with the right rear wheel gear case 200R as a reference, so that the operator Since it becomes easy to perform the maintenance of the fertilization transmission member 401 and its periphery from the outside of the machine body, the maintenance workability is improved.

  Further, by disposing the fertilization transmission member 401 above the right rear wheel gear case 200R, the distance to the feeding portion 61 of the fertilizer application device 5 disposed on the traveling vehicle body 2 can be shortened, so that transmission loss of driving force Can be suppressed.

  Further, when the fertilization transmission actuator 426a is arranged above the right rear wheel gear case 200R and below the floor step 35, mud soil that is spun up by the rotation of the rear wheel 11 becomes difficult to reach the fertilization transmission member 401, and the fertilization transmission member The mud is prevented from adhering to 401.

  Further, a rod (not shown) is attached to the lower link 41 of the lifting / lowering link mechanism 3, the rod is connected to the base portion 324 b R of the switching shifter 324 R via the cable 427, and the fertilization transmission on / off member 422 is turned on / off. You may have the function to perform.

  Furthermore, it is good also as a structure which can mount | wear with the manual operation member 426 to the fertilization transmission member 401, and can let out a fertilizer manually. FIG. 8 shows a configuration in which the fertilization transmission member 401 protrudes on the inner side (that is, the left side) of the right rear wheel gear case 200R. If the manual operation member 426 is attached to the protrusion, the fertilizer supply of the fertilizer application device 5 can be manually operated.

  The fertilizer supplied by the fertilizer application device 5 is changed according to the components of the field and the crops to be cultivated by the operator, but the specific gravity of the fertilizer varies depending on the components. Thereby, even if the setting of the fertilizer supply amount of the fertilizer application device 5 is the same, the amount of fertilizer that is actually supplied may be larger or smaller than the setting, and the supply of fertilizer to the field Excess or deficiency of volume may occur. In order to prevent this, a so-called “trial feeding” operation is performed in which the fertilizer 5 is operated before planting seedlings in the field, and the amount of fertilizer released from the fertilizer 5 within a predetermined time is confirmed. It is necessary to set the supply amount of fertilizer to an amount suitable for the working conditions.

  On the other hand, since the fertilizer application device 5 is configured not to be driven unless the seedling planting unit 4 is driven, when performing the “trial feeding” operation, it is performed before placing the seedlings on the seedling planting unit 4 or once seedlings. It is necessary to lower the seedling from the planting part 4, and there is a problem of spending extra work time. Further, if the seedling is placed on the seedling planting unit 4, there is a problem that the seedling is scraped off during the trial feeding and the seedling is consumed excessively. Furthermore, since it is necessary to operate the engine, there is a problem that excess fuel is consumed and fuel consumption is reduced.

  However, as described above, if one end of the fertilization transmission member 401 protrudes to the right from the right rear wheel gear case 200R, and the manual operation member 426 is attached to this protrusion, the “ The “trial feeding” operation can be performed.

  Therefore, when the operator performs a “trial feeding” operation by a manual operation using the manual operation member 426, excessive fuel consumption of the traveling vehicle body 2 is suppressed, and fuel consumption is improved.

  Further, by providing the manual operation member 426 in the vicinity of the right rear gear case 200R on the right side, the driving force supply distance to the fertilizer device 5 at the rear of the machine body can be shortened, so that the transmission loss of the driving force is small and the operating efficiency is small. And the force for operating the manual operation member 426 is reduced, so that the labor of the operator is reduced.

  Further, when the right rear wheel gear case 200R side rear wheel 11 provided with the fertilization transmission member 401 turns while turning inside, the left rear wheel gear case 200L side rear wheel without the fertilization transmission member 401 is provided. The operation timing of the fertilization transmission actuator 426a after turning is made earlier than when turning 11 is inside the turning.

  During turning, the side clutch 87 inside the turning is disengaged by the steering mechanism S, so that the transmission of the driving force to the right rear wheel gear case 200R located inside the turning is cut off. Therefore, when turning to the right side where the fertilization transmission member 401 is provided, the rotation speed of the fertilization transmission member 401 when the fertilization transmission on / off member 422 is turned on is lower than when turning to the left side. There is a problem that the timing at which the fertilizer application device 5 is activated is delayed, the fertilizer supply start position changes depending on the turning direction, and a position where no fertilizer is supplied is generated.

  However, by making the operation timing of the fertilization transmission actuator 426a after the right turn faster than the operation timing after the left turn, the rotation speed at which the fertilization transmission can be started after the turn can be reliably ensured. Supply start timing can be stabilized, and the occurrence of a section where no fertilizer is supplied is prevented.

  In the above, since the fertilization transmission member 401 is provided on the right rear wheel gear case 200R, the operation timing of the fertilization transmission actuator 426a is advanced when turning rightward than when turning leftward (for example, 3 Control is performed by the controller 163. Specifically, when turning right, the on-time of the rotation pulse of the fertilizer transmission member 401 after the float 55 contacts the ground is set shorter than when turning left, and the fertilization transmission actuator 426a is activated at an early timing to transmit fertilization. The on / off member 422 is turned on.

  When turning right, the output rotation speed of the fertilization drive to the right rear wheel gear case 200R decreases along with the disconnection of the right side clutch 87, so the start point of fertilization is lower than when turning left. Although it tends to be delayed, the driving of the fertilizer application device 5 can be made constant regardless of the turning direction.

  Further, when the worker makes the sub-shift switching operation member 17 neutral along the lever guide 17a, it is detected that the sub-shift operation position detecting member 17b is operated to the neutral position N as shown in FIG. Then, the operation of the planting device 52 is stopped by stopping the planting operation on / off member 25a by operating the planting clutch motor 24 to the cut side by the control device 163 (stop function). On the other hand, when the auxiliary transmission switching operation member 17 is operated to the stop planting position W next to the neutral position, the supply of driving force to the left and right front wheels 10 and 10 and the left and right rear wheels 11 and 11 of the traveling vehicle body 2 is stopped. In this state, the planting device 52 can be operated. This is referred to as “stop planting work”.

  The stop planting position W is provided with a stop planting position detection member 430 which is a sensor switch. When the sub shift change operation member 17 hits, the stop planting position W is turned on and a signal is input to the control device 163. And the signal which operates the planting clutch motor 24 to an entrance side is output from the control apparatus 163, the planting operation on / off member 25a will be in an ON state, and the planting apparatus 52 will operate | move. This is called a stop planting function.

  The auxiliary transmission switching operation member 17 is always urged from the stop planting position W to the neutral position N by an urging member such as a torque spring (not shown), and when the operator releases the auxiliary transmission switching operation member 17. The configuration immediately returns to the neutral position N. As a result, if the operator does not intentionally operate the sub-transmission switching operation member 17 to the stop planting position W, the sub-transmission switching operation member 17 is not detected by the stop planting position detection member 430, and the planting device 52 is Does not work.

  FIG. 10 is a plan view showing a transmission mechanism for driving wheels in the transmission case 12. The actual transmission shafts are not arranged on the same plane, but in order to explain the transmission mechanism, they are displayed on the same plane. In FIG. 10, the upward direction in the drawing is the right side of the vehicle body, and the downward direction is the left side of the vehicle body.

  The mission case 12 receives the rotational power from the continuously variable transmission 23 by a mission input shaft 583, and the left and right front wheels 10 and 10 and the left and right rear wheels 11 are driving wheels via the auxiliary transmission 571, the differential device 585, and the like. , 11 are driven.

  The sub-transmission device 571 has a mechanism for switching the traveling state of the traveling vehicle body 2 to “planting work speed”, “road speed”, and “traveling neutral”, and a sub-transmission switching shaft 572 that rotates at a rotational speed after shifting. A switching member 573 fitted on the auxiliary transmission switching shaft 572, a planting speed transmission member 574, a road speed transmission member 575, and a relay shaft 576 are included. The traveling state is changed by changing the ratio of the rotational speeds of the relay shaft 576 and the auxiliary transmission switching shaft 572. The auxiliary transmission switching shaft 572 and the switching member 573 are configured to be operable in the axial direction of the auxiliary transmission switching shaft 572 by spline processing, and the operator operates the auxiliary transmission switching operation member 17 to operate the switching member 573. The traveling state of the traveling vehicle body 2 is switched.

  The relay shaft 576 has two gears with different diameters, one of which receives the rotational power from the mission input shaft 583. Of the two gears, the one with the larger diameter is a road speed transmission member 575, which meshes with the gear of the switching member 573 when the operation position of the sub-transmission switching operation member 17 is “road speed”. The thing with a small diameter always meshes with the planting speed transmission member 574. By this meshing, the relay shaft 576 transmits power to the planting speed transmission member 574 and the road speed transmission member 575.

  The planting speed transmission member 574 meshes with a gear having a small diameter of the relay shaft 576 and is provided on the right side coaxial with the auxiliary transmission switching shaft 572. The planting speed transmission member 574 and the auxiliary transmission switching shaft 572 are configured to be relatively rotatable with each other by a metal bearing. Further, a planting main transmission shaft 582 that transmits a driving force to the seedling planting unit 4 is coaxially and rotatably coupled to the planting speed transmission member 574. As a result, the planting main transmission shaft 582 can rotate relative to each other on the same axis as the auxiliary transmission switching shaft 572.

  On the right side surface of the switching member 573, a meshing portion of a claw clutch coupled to the planting speed transmission member 574 is provided, and teeth that mesh with the road speed transmission member 575 are formed on the outer periphery.

  A part of the rotational power from the auxiliary transmission switching shaft 572 is distributed and transmitted to the left and right front wheel axles 584, 584 by the differential device 585, and further transmitted to the front wheel final cases 13, 13 by the front wheel axles 584, 584. 10 and 10 are driven. Then, the rear-wheel drive power extracted from the rear surface of the transmission case 12 via the left and right front wheel axles 584, 584 is transmitted to the rear wheel gear cases 200L, 200R via the rear wheel transmission shafts 230L, 230R. The wheels 11 and 11 are driven. The transmission case 12 is provided with a brake device 581 for restricting the rotation of the front wheels 10 and 10 and the rear wheels 11 and 11 on the left side of the auxiliary transmission switching shaft 572.

  FIG. 11 is an operation explanatory diagram of the auxiliary transmission mechanism in the mission case 12 of FIG. FIG. 11A shows a meshing diagram when the operation position of the auxiliary transmission switching operation member 17 is “road speed”, and FIG. 11B shows that the operation position of the auxiliary transmission switching operation member 17 is “neutral”. FIG. 11 (c) shows an engagement diagram when the operation position of the auxiliary transmission switching operation member 17 is “planting work speed”. In FIG. 11, the upward direction in the drawing is the right side of the vehicle body, and the downward direction is the left side of the vehicle body.

  At the “road speed”, the teeth on the outer periphery of the switching member 573 mesh with the teeth of the road speed transmission member 575 of the relay shaft 576. With this configuration, rotational power is transmitted to the switching member 573, and the auxiliary transmission switching shaft 572 that meshes with the switching member 573 by the spline rotates together with the switching member 573, and the differential device 585 is driven by the gear located on the left side of the switching member 573. Rotational power is transmitted to At this time, the planting speed transmission member 574 is rotated by the relay shaft 576, but rotates at a different rotational speed from the auxiliary transmission switching shaft 572 that is relatively rotatable.

  When “neutral”, the switching member 573 does not mesh with any of the planting speed transmission member 574 and the road speed transmission member 575. Although the planting speed transmission member 574 is rotated by the relay shaft 576, the auxiliary transmission switching shaft 572 to which the rotational power is not transmitted remains stopped. At this time, the planting speed transmission member 574 and the planting main transmission shaft 582 are coaxially and rotatably coupled so that only the seedling planting unit 4 can be operated. A similar mechanism is obtained when the auxiliary transmission switching operation member 17 is operated to the stop planting position W.

  At the “planting operation speed”, the right side of the switching member 573 is engaged with the left side of the planting speed transmission member 574 with a claw clutch and connected to each other. The planting speed transmission member 574 is rotated by the relay shaft 576, the switching member 573 connected by the claw clutch is rotated, and the auxiliary transmission switching shaft 572 that is meshed with the switching member 573 by the spline is rotated. Is transmitted from the relay shaft 576 to the auxiliary transmission switching shaft 572, and the rotational power is transmitted to the differential device 585 by the gear located on the left side of the switching member 573.

  In addition, when the sub-transmission switching operation member 17 is in the neutral position N, it is transmitted to the seedling planting unit 4, but is transmitted to the seedling planting unit 4 because the planting operation on / off member 25a is cut. Is cut off. Therefore, even when in the neutral position N, if the planting operation on / off member 25a is connected, that is, in the on state, the seedling planting unit 4 is in a driving state. As a result, when the auxiliary transmission switching operation member 17 is operated to the stop planting position W, the planting operation on / off member 25a is in the on state while maintaining the above-mentioned "traveling neutral" state. The planting device 52 operates in a stopped state.

  FIGS. 12 to 15 show transmission mechanism diagrams (schematic diagrams) corresponding to the operation positions of the auxiliary transmission switching operation member 17.

  The gear mechanism of the sub-transmission device 571 differs only between the high-speed side and the low-speed side when the operation position of the sub-transmission switching operation member 17 shown in FIG. 12 is the road speed and at the planting work speed shown in FIG. In other traveling systems, planting systems, fertilizing systems, etc., all clutches are engaged. However, when traveling on the road, it is basically a non-working traveling, so the seedling planting part 4 is raised, and the planting operation on / off member 25a, the fertilizer transmission on / off member 422 and the leveling rotor on / off clutch 322 are It is turned off.

  And when the operation position of the sub-transmission switching operation member 17 shown in FIG. 14 is neutral, it is not transmitted to the traveling system, so that the driving force is not transmitted to the leveling system or fertilization system on the lower transmission side. Moreover, since the planting operation on / off member 25a is also in the cut state, traveling stops and the planting device 52, the fertilizer application device 5 and the like are not operated.

  On the other hand, when the operation position of the sub shift switching operation member 17 shown in FIG. 15 is stop planting, the transmission to the traveling system is cut off as in the neutral state, but the planting operation on / off member 25a is Since it is in the on state, the power from the engine 20 is transmitted to the planting system and the planting device 52 operates. In addition, since it is not transmitted to a driving | running | working system | strain, a driving force is not transmitted to the fertilizing system and leveling system | strain which branch from the rear-wheel gear case 200R on the right side.

  As described above, when the auxiliary transmission switching operation member 17 is operated to the stop planting position W, the planting operation can be performed in a state in which traveling is stopped. The plant can be planted and is excellent in workability, and it is not necessary to manually plant seedlings, thereby reducing the labor of the operator.

  At the beginning of seedling planting, when the position where the planting device 52 plants the first plant does not match the planting end position of the adjacent strip, the seedling can be planted without moving from the place, Improves seedling planting accuracy. In particular, the position is likely to be disturbed when the body turns 90 ° in the corner of the field, and the seedling can be reliably planted at a position where the seedling can be planted.

  Normally, when planting seedlings, it must travel, so in order to plant seedlings without moving from the place, it is necessary to quickly start, stop, and planting and turning operations, and it is difficult unless you are an expert. With this configuration, anyone can plant seedlings easily.

  However, if the seedling planting operation is performed in a state where the float 55, the middle floats 57, 57, and the side floats 56, 56 are not in contact with the ground, the seedling planting tool 52a operates above the field scene, and the seedling is removed. It may be dropped. Therefore, if the angle detection member 162 does not detect that the float 55 is in a grounded state, the planting device 52 does not operate even if the sub shift switching operation member 17 is operated to the stop planting position W. This is called a stop planting invalid function.

  According to this configuration, it is possible to prevent the seedling from being dropped above the farm scene due to an erroneous operation, so that consumption of excess seedling is prevented.

  In addition, by enabling the stop planting function and the stop planting invalid function in the turn interlocking mode, the seedlings are planted in the air at the time of turning at the shore, that is, the seedlings are separated above the farm scene, etc. The malfunction of the planting apparatus 52 can be prevented. This flowchart is shown in FIG.

  It is detected by the stop planting position detection member 430 that the auxiliary gearshift switching operation member 17 is at the stop planting position W (precondition). At this time, the swing interlocking switch 90 is turned on, and the float 55 is When the angle detection member 162 detects that the grounding state is established, the stop planting function is enabled (permitted), and a signal for operating the planting clutch motor 24 to the input side is output from the control device 163, and planting is performed. The attached operation on / off member 25a enters and the seedling is planted.

  On the other hand, when it is not in the turn interlocking mode or when the float 55 is in the separated state, the stop planting function does not work (prohibited), and the control device 163 outputs a signal for operating the planting clutch motor 24 to the cutting side. Since the planting operation on / off member 25a is cut, seedlings are not planted.

  As described above, it is possible to prevent a decrease in work efficiency by setting whether or not the planting operation (stop planting operation) in the state where the traveling of the traveling vehicle body 2 is stopped is based on the grounding of the float 55.

  Further, the stop planting function shown in FIG. 1 does not operate when the brake pedal 110 is operated, and the planting device 52 does not operate even if the sub shift switching operation member 17 is operated to the stop planting position W. Good. This flowchart is shown in FIG.

  The operation amount of the brake pedal 110, that is, the depression amount is detected by a brake pedal sensor 110a provided at the base of the brake pedal 110 shown in FIG. The brake pedal sensor 110a may be of a type that comes into contact when depressed to some extent, but may be a stroke sensor or the like. When the brake pedal 110 is depressed, the stop planting function does not work, so that an erroneous operation when the rice transplanter 1 is stopped can be prevented, which is safe.

  Further, the rice transplanter 1 switches the output of the continuously variable transmission 23 by driving the trunnion shaft electric motor 103 (FIG. 5) in the forward or reverse direction by the operation of the main transmission switching operation member 16 (the continuously variable transmission). 23, the number of rotations and the direction of rotation of the output shaft are changed), and the trunnion shaft electric motor is configured in accordance with the operation position of the main transmission switching operation member 16 detected by the main transmission operation amount detection member 16b. 103 is configured to output a drive command signal. The trunnion shaft actuator 103 is provided outside the continuously variable transmission 23 and operates in conjunction with the operation amount of the main transmission switching operation member 16 detected by the main transmission operation amount detection member 16b.

  Then, the trunnion shaft actuator 103 rotates the trunnion shaft 295, operates a trunnion arm (not shown) directly connected to the trunnion shaft 295, and rotates until the rotation angle of the trunnion shaft 295 reaches a predetermined angle. Let The rotation direction and rotation angle of the trunnion shaft 295 are detected by a trunnion shaft detection member 113 provided on the trunnion arm.

  And even if it is detected by the angle detection member 162 that the float 55 is in the grounding state when the turning interlocking switch 90 is in the turning interlocking mode, the operation position of the main shift switching operation member 16 shown in FIG. May be configured such that the stop planting function is effective only when the is at the neutral position 16aa and the trunnion shaft 295 is also at the neutral position. This is called a stop planting neutral function. This flowchart is shown in FIG.

  The turning interlocking switch 90 is in the turning interlocking mode, and the angle detection member 162 detects that the float 55 is in the grounded state, and the main transmission switching operation member 16 detected by the main transmission operation amount detection member 16b. When the operation position is the neutral position and the trunnion shaft detection member 113 detects that the trunnion shaft 295 is the neutral position, the stop planting function is enabled (permitted), and the sub-transmission switching operation member 17 is moved. When operated to the stop planting position W, the planting operation on / off member 25a enters the on state, and seedlings are planted.

  On the other hand, when the operation position of the main transmission switching operation member 16 detected by the main transmission operation amount detection member 16b is not the neutral position 16aa, or the rotation direction and rotation of the trunnion shaft 295 detected by the trunnion shaft detection member 113 When the angle is not the neutral position 16aa, the stop planting function does not work (prohibited) even if the sub shift switching operation member 17 is operated to the stop planting position W, and the planting operation on / off member 25a is in the cut state. So seedlings are not planted.

  As described above, if the traveling of the traveling vehicle body 2 is not completely stopped, the planting operation is not performed, so that a malfunction of the planting device 52 can be prevented. For example, during planting work (work travel), the side shift switching operation member 17 is operated to the stop planting position W by an erroneous operation, and the side shift switching operation member 17 comes into contact with the stop planting position detection member 430. No change occurs in the seedling planting operation travel even if operated, so that a reduction in work efficiency and seedling planting accuracy due to an erroneous operation is prevented.

  Furthermore, the planting of the seedling at this time may be configured to be performed by setting the planting operation on / off member 25a to the on state after the trunnion shaft 295 is at a predetermined angle. This flowchart is shown in FIG.

  That is, the operation is stopped when the operation position of the main transmission switching operation member 16 detected by the main transmission operation amount detection member 16b is the neutral position and the trunnion shaft 295 detected by the trunnion shaft detection member 113 is the neutral position. A signal for operating the planting clutch motor 24 to the input side is output from the control device 163 by enabling the planting function. The operation signal of the planting clutch motor 24 is determined by the control device 163 to validate the stop planting function, and the operation signal is output to the trunnion shaft actuator 103 so that the trunnion shaft 295 has a predetermined angle (target value). It is the configuration that is output after Then, the fertilization transmission actuator 426a is operated to bring the fertilization transmission on / off member 422 into the on state. This is called a stop planting operation function.

  By raising the output of the continuously variable transmission 23 to a predetermined value and then supplying driving force to the planting device 52, the planting device 52 can be reliably operated in a state where traveling is stopped. Improves application accuracy and fertilization accuracy.

  First, the rotation speed of the seedling planting tool 52a of the planting device 52 is gradually increased when the planting operation on / off member 25a is inserted and then output to the trunnion shaft actuator 103 of the trunnion shaft 295. The control process becomes, and the operation is not stable. However, with this configuration, the rotation speed of the seedling planting tool 52a is smoothly rotated from the beginning by setting the planting operation on / off member 25a to the on state after being first output to the trunnion shaft actuator 103. Stabilize.

  That is, when the output of the continuously variable transmission 23 is increasing, the rotation speed of the seedling planting tool 52a also increases stepwise, so that the operation of the seedling planting tool 52a becomes unstable. As described above, when the output of the continuously variable transmission 23 has reached a constant value, the rotational speed of the seedling planting tool 52a is stabilized relatively quickly, so that a smooth movement is achieved.

  Further, after the previous trunnion shaft 295 has reached the target value, the planting operation on / off operation is performed during the on / off process of the planting operation on / off member 25a when the signal for operating the planting clutch motor 24 to the on side is output. If the control is stopped before the member 25a enters the engaged state (corresponding to “a continuously variable transmission forward output” and “planting delay timer up” in FIG. 22 described later), the planting clutch motor 24 is turned off. It is set as the structure which outputs the signal operated to the side and cuts the planting operation on / off member 25a. The time when this control is stopped is when it is too short by measuring the ON time of the stop planting position detecting member 430, that is, the time during which the auxiliary transmission switching operation member 17 is pressed against the stop planting position W with a timer (not shown). and so on.

  Even when the planting operation on / off member 25a is in the process of being turned on, if the control stops, the planting operation on / off member 25a is returned to the off state, thereby switching the sub planting position detection member 430 to the sub-shift. The planting operation on / off member 25a is prevented from being turned on and off every time the operation member 17 hits, and a malfunction is prevented.

  And when control stops and the planting operation on / off member 25a is turned off during the on / off process of the planting operation on / off member 25a, after the planting operation on / off member is in the off state, it is constant. After rotating the seedling planting tool 52a for a time (for example, about 0.5 to 2 seconds) (rotating by inertia), the trunnion shaft 295 is output to the trunnion shaft actuator 103 and the trunnion shaft 295 is set to the previous target value (stop planting operation) In this configuration, the trunnion arm can be secured at the neutral position from which the output of the continuously variable transmission can be secured.

  When the trunnion shaft 295 is set to the neutral position and the planting operation on / off member 25a is turned off, the driving position is not supplied to the seedling planting tool 52a, so that the stop position becomes the position at that time. The seedling planting tool 52a does not stop at the position.

  Therefore, the seedling planting tool 52a is stopped at the normal stop position by turning the seedling planting tool 52a for a certain time after the planting operation on / off member 25a is turned off. This regular stop position is designed by a combination of gears in the seedling planting tool 52a. Therefore, the stop position of the seedling planting tool 52a is stabilized.

  After the planting operation on / off member 25a is turned off and the trunnion shaft 295 is set to the neutral position, the planting clutch motor 24 is operated to set the planting operation on / off member 25a to the on state. deep. An operator may forget to put the planting operation on / off member 25a when the sub-shift switching operation member 17 is operated to the stop planting position W to plant only one stock and then the operation is resumed. However, after the stop planting operation, the planting operation on / off member 25a is automatically turned on so that the operation can be resumed simply by traveling at the planting speed.

  In addition, a specific flowchart according to the stop planting function when the auxiliary transmission switching operation member 17 is operated to the stop planting position W is shown below.

  FIG. 20 shows a rough flowchart of processing by the stop planting function. This process has five types of stop planting processes 0 to 4, and is performed in the order of the stop planting processes 0 to 1, 2, 3, and 4. FIG. 21 shows the flow of the stop planting process 0, FIG. 22 shows the flow of the stop planting process 1, FIG. 23 shows the flow of the stop planting process 2, and FIG. The flow of the stop planting process 3 is shown, and the flow of the stop planting process 4 is shown in FIG.

  In the stop planting process 0 in FIG. 21, the stop planting function is effective when the operation position of the main transmission switching operation member 16 is the neutral position and the operation position of the auxiliary transmission switching operation member 17 is also the neutral position. Becomes (permitted) and enters a standby state. Then, when the stop planting position detection member 430 detects that the sub shift switching operation member 17 has been operated to the stop planting position W, the stop planting process 1 is set. Then, a planting insertion delay timer of a signal for operating the planting clutch motor 24 from the control device 163 is set (predetermined time, for example, 1 second), and then the flow proceeds to the stop planting process 1 in FIG.

  In the stop planting process 1, the trunnion shaft actuator 103 is rotated forward (forward side), and the trunnion shaft 295 of the continuously variable transmission 23 is rotated. At this time, the position of the main transmission switching operation member 16 remains in the neutral position, and only the trunnion shaft 295 is rotated forward by the trunnion shaft actuator 103 so that power is transmitted to the seedling planting unit 4. Become.

  Then, when the set time of the previous planting / delay timer has elapsed (timer up), the stop planting process 2 is set, and the planting operation on / off member 25a is activated (for example, 1-2 seconds). And a signal for operating the planting clutch motor 24 is output from the control device 163. Then, the process proceeds to the flowchart of the stop planting process 2 in FIG.

  In the stop planting process 2, when the planting clutch motor 24 is operated and the planting operation on / off member 25a is turned on, the stop planting process 3 is set, and then the flowchart of the stop planting process 3 in FIG. Move on. In the stop planting process 3, when the previous operation time has elapsed (timer up), the stop planting process 4 is set and the trunnion shaft 295 is set to the neutral position after the planting operation on / off member 25a is turned off. After setting the time to return (for example, 1-2 seconds), the planting operation on / off member 25a is turned off, and then the process proceeds to the flowchart of the stop planting process 4 in FIG.

  In the stop planting process 4, when the time until the previous trunnion shaft 295 is returned has elapsed, the trunnion shaft 295 rotates from the forward side to the stop side, and then reaches the neutral position, thereby completing the flowchart.

  FIG. 26 and FIG. 27 below show the overall flow of the above flowcharts. The end of the stop planting operation is when the seedling planting tool 52a of the planting device 52 is rotated once or when the time for finishing planting has elapsed, and when the operation of the auxiliary transmission switching operation member 17 is stopped halfway. The former flowchart is shown in FIG. 26, and the latter flowchart is shown in FIG. FIG. 27 shows not only the latter but also the entire flow.

  In FIG. 26, when the trunnion shaft 295 of the continuously variable transmission 23 is rotating forward or backward, when the stop planting process is not being performed, the normal continuously variable transmission output process is performed. That is, a driving force corresponding to the operation position of the main transmission switching operation member 16 is output. On the other hand, when the stop planting process is in progress (during one of the above processes 0 to 4) and the trunnion shaft 295 is being output to the stop side by the trunnion shaft actuator 103 (see “Continuously Variable Transmission” in FIG. 25). "Equipment stop output") is determined whether the trunnion shaft 295 is in the neutral position, and when the trunnion shaft detection member 113 detects that the trunnion shaft 295 is in the neutral position, the stop planting process is performed. finish.

  Then, after the stop planting process is finished, it is determined whether or not the stop planting process 4 has already been performed. When the stop planting process 4 has already been performed, the planting clutch motor 24 is operated to plant the planting process. The auxiliary operation on / off member 25a is turned on. In the state of FIG. 26, since the seedling is normally planted normally, the routine is shifted to normal planting work after the stop planting process is completed. At this time, if the planting operation on / off member 25a remains in the off state, there is a possibility that the start of planting may be delayed at the start of traveling. .

  By setting the planting operation on / off member 25a to the on state, the sub-transmission switching operation member 17 is operated to the planting work speed position, and when the main transmission switching operation member 16 is operated forward, the planting is immediately performed. You can start working. Thereafter, the stop planting process 0 is set, and the next stop planting process is reset so as to start from the stop planting process 0.

  In addition, when the trunnion shaft 295 is output to the forward side (or the reverse side) even during the stop planting process, it is output up to a certain opening (previous target value).

  In FIG. 27, first, during the stop planting process in which the sub-transmission switching operation member 17 is operated to the stop planting position W, the sub-transmission switching operation member 17 is detached from the stop planting position W and the stop planting position detection member 430. When it is detected that the stop planting position W is not present, it is determined which stage the stop planting process at that time is.

  At this time, when the stop planting process 1 is in progress, the stop planting process 0 is set, and the trunnion shaft actuator 103 outputs the trunnion shaft 295 to the stop side (“continuously variable transmission stop output” in FIG. 25). Equivalent). On the other hand, when the stop planting process is not the stop planting process 0, it is determined whether or not it is the stop planting process 2 or 3, and when it is the stop planting process 2 or 3, the planting operation on / off member The stop planting process 0 is set after 25a is turned off (corresponding to “planting operation on / off member cutting output” in FIG. 24), and the trunnion shaft 295 is output to the stop side by the trunnion shaft actuator 103.

  FIG. 28 shows the configuration of the hydraulic circuit of the continuously variable transmission 23 of the rice transplanter 1 of this embodiment, FIG. 29 shows a side sectional view of the continuously variable transmission 23, and FIG. 30 shows the continuously variable transmission. A plan sectional view of the transmission 23 is shown.

  As shown in FIG. 28, a variable displacement hydraulic pump that adjusts the amount and direction of hydraulic oil discharged by reciprocating movement of a plurality of pistons 248 arranged in parallel in conjunction with an input shaft 274 for inputting power from the engine 20. A and a continuously variable hydraulic motor B, which changes the rotational speed and direction of the output shaft 275 in accordance with the amount of oil discharged from the hydraulic pump A and the direction of oil discharge, are connected via hydraulic closed circuits 266 and 267. A transmission 23 is configured.

  Further, as shown in FIGS. 29 and 30, a part of the hydraulic closed circuits 266 and 267 are provided inside, and a port block 271 is arranged in a direction orthogonal to the input shaft 274 and the output shaft 275, and the port block 271 and the hydraulic pressure The hydraulic closed circuits 266 and 267 are formed by connecting the inside of the block of the hydraulic pump side cylinder 247a with the pump A and the inside of the block of the hydraulic motor side cylinder 247b with the hydraulic motor B, respectively.

  When the hydraulic circuit 266 and the hydraulic circuit 267 shown in FIG. 28 form a closed circuit, and the swash plate 69 on the variable displacement hydraulic pump A side shown in FIG. 29 increases the inclination angle to the forward rotation side, the hydraulic circuit 266 is fixed via the hydraulic circuit 266. The hydraulic pressure acting on the displacement hydraulic motor B side becomes high, and at this time, the hydraulic circuit 267 on the opposite side of the hydraulic circuit 266 has a low pressure so that the oil discharged from the fixed displacement hydraulic motor B side is variable displacement hydraulic pump A. Inhaled to go.

  The port block 271 shown in FIGS. 29 and 30 is integrated with a case of a continuously variable transmission case 272 and a boost pump 273 (see FIG. 28) in which a variable displacement hydraulic pump A and a fixed displacement hydraulic motor B are housed. An input shaft 274 and an output shaft 275 whose axial directions are parallel to each other are supported. A trochoid rotor (not shown) of the hydraulic pump A and the boost pump 273 is provided around the input shaft 274, and a hydraulic motor B is provided around the output shaft 275.

  In these hydraulic pump A and hydraulic motor B, a number of cylinders 247 are arranged around the input shaft 274 and the output shaft 275 in parallel with the axial direction to form a cylinder block, and each cylinder 247 slides in the axial direction. A moving piston 248 is provided. Each of the pistons 248 is supported at its tip by a ball joint of the joint disk 277 so as to be swingable, and is provided so as to be rotatable around the shafts 274 and 275 with respect to the thrust plate 278 of the swash plate 69.

  The boost pump 273 replenishes oil into the hydraulic circuits 266 and 267 from the tank port T, and passes through an oil filter 280, a main relief valve 281, field valves (check valves) 282a and 282b, a neutral valve 283, and the like. The hydraulic circuits 266 and 267 communicate with each other. A high-pressure relief valve 285 is provided between the hydraulic circuits 266 and 267.

  The trunnion shaft 295 is provided in a direction orthogonal to the input shaft 274, and a pin slider 298 of a crank arm 296 integrated with the trunnion shaft 295 is engaged with a roller groove 69 a formed in the swash plate 69 at the tip of the trunnion shaft 295. In combination, the trunnion shaft 295 is operated to operate the trunnion shaft actuator 103 and the trunnion arm is rotated, so that the pin slider 298 is swung to adjust the inclination angle of the swash plate 69.

  When the angle of the swash plate 69 is changed by rotating the trunnion shaft 295, the pressing position of the piston 248 changes, and the high pressure and low pressure of the hydraulic pump A are switched.

  FIG. 31 shows an enlarged view of the piston 248 portion. Generally, as shown in FIG. 31 (a), a dome-shaped piston is used. However, if the R dimension at the piston tip is small, the surface pressure becomes high and the strength is weakened. There is a problem that the reaction force of the swash plate 69 increases and the operation load of the trunnion shaft 295 becomes heavy.

  Therefore, as shown in FIGS. 31B and 31C, the piston 248a on the hydraulic pump A side uses a piston having a small R dimension to reduce the operation load of the trunnion shaft 295 by the trunnion shaft actuator 103, and always has a constant angle. The piston 248b on the side of the hydraulic motor B that contacts the joint disk 277 is preferably secured by using a piston having a large R dimension.

  FIG. 31B shows the piston 248a on the hydraulic pump A side, and FIG. 31C shows the piston 248b on the hydraulic motor B side. For example, the R dimension of the piston 248a is 24 (mm), and the R dimension of the piston 248b is 28 (mm).

  Normally, the piston 248a of the hydraulic pump A and the piston 248b of the hydraulic motor B use the same shape piston, but the R dimension of the tip of the piston 248 is changed as described above between the hydraulic pump A side and the hydraulic motor B side. By doing so, the following effects are exhibited.

  That is, with respect to the hydraulic pump A side, the contact position of the joint disk 277 and the R portion at the tip of the piston 248a fluctuates due to the movement of the swash plate 69. A piston with a small R dimension with a small force is adopted, and on the hydraulic motor B side, the joint disk 277 and the R portion at the tip of the piston 248b are always in contact with each other at a constant angle. By using a piston with a large size, it is possible to provide a continuously variable transmission 23 having a light operation load on the trunnion shaft 295 and high pressure resistance.

  FIG. 32 shows an example different from the piston 248 of FIG.

  Further, as shown in FIG. 32A, a spiral groove 248c may be provided on the outer peripheral surface (side surface) of the piston 248. In the dome type piston, if the sliding part U on the side surface causes the oil film to run out, it may cause problems such as abnormal wear and seizure between the dome type piston and the cylinder block, but a spiral groove should be provided on the outer peripheral surface. Therefore, formation of an oil film can be facilitated and these problems can be prevented.

  In other words, hydraulic oil is introduced into the groove 248c in accordance with the longitudinal movement of the piston 248, thereby promoting the formation of an oil film and preventing problems such as abnormal wear.

  The shape of the groove is not limited to a spiral shape, and may be a lattice-shaped groove 248d as shown in FIG. 32B or a wedge-shaped groove 248e as shown in FIG. 32 is common to both the piston 248a of the hydraulic pump A and the piston 248b of the hydraulic motor B.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a riding seedling transplanter equipped with a fertilizer application device and a seedling planting unit.

2 traveling vehicle body 4 seedling planting part 16 main transmission switching operation member 16b main transmission operation position detecting member 17 switching operation member (sub-transmission switching operation member)
20 engine 23 continuously variable transmission 25a planting operation on / off member 55 float 103 trunnion shaft electric motor 113 trunnion shaft detection member 162 angle detection member 163 controller 295 trunnion shaft 430 stop planting position detection member 571 switching device (sub transmission) )

Claims (4)

A seedling planting part (4) is provided at the rear of the traveling vehicle body (2) so as to be movable up and down, and a switching device (571) for switching transmission to the traveling vehicle body (2) and the seedling planting part (4) is provided. A switching operation member (17) for switching the device (571) is provided, and a float (55) for grounding the field scene is provided in the seedling planting part (4), and the rotation angle of the float (55) is detected. In the seedling transplanter provided with the angle detection member (162),
A planting operation on / off member (25a) for turning on and off the operation of the seedling planting part (4) is provided,
When the switching operation member (17) is operated, a stop planting position (W) is formed that places the planting operation on / off member (25a) in an on state in a state where transmission to the traveling vehicle body (2) is cut off, A stop planting position detection member (430) for detecting an operation of the switching operation member (17) to the stop planting position (W) is provided;
Even if the stop planting position detecting member (430) is in a detection state and the detected angle of the angle detecting member (162) is out of a predetermined angle range, the planting operation on / off member (25a). A seedling transplanting machine provided with a control device (163) for turning off the machine. An engine (20) is provided on the traveling vehicle body (2), and a seedling planting portion (4) is provided at the rear part of the traveling vehicle body (2) so as to be movable up and down, to the traveling vehicle body (2) and the seedling planting portion (4). Is provided with a switching device (571) for switching the transmission of the switch, a switching operation member (17) for switching the switching device (571), and a float (55) for grounding the field scene on the seedling planting part (4). In a seedling transplanting machine provided with an angle detection member (162) for detecting the rotation angle of the float (55),
A planting operation on / off member (25a) for turning on and off the operation of the seedling planting part (4) is provided,
A continuously variable transmission (23) that transmits power from the engine (20) to the auxiliary transmission (571) is provided, and a main transmission operating member (16) that operates the continuously variable transmission (23) is provided. A main transmission operation position detection member (16b) for detecting the operation of the operation member (16) is provided, and the output of the continuously variable transmission (23) is changed based on the detection of the main transmission operation position detection member (16b). A control device (163) is provided;
The control device (163) detects that the main transmission switching operation member (16) is operated to a neutral position for stopping the output of the continuously variable transmission (23) by the main transmission operation position detection member (16b). to which, when detected in the previous SL sWITCHING operating member (17) and with stop planting position that rotation angle is within a predetermined angular range of the float (55) by the angle detecting member (162) The seedling transplanting machine, wherein when operated in (W), the planting operation on / off member (25a) is turned on. The continuously variable transmission (23) is provided with a trunnion shaft (295) for changing the output of the continuously variable transmission (23), and a trunnion shaft actuator (103) for rotating the trunnion shaft (295), A trunnion shaft detection member (113) for detecting the rotational position of the trunnion shaft (295) is provided;
In the control device (163), the main transmission operation position detecting member (16b) detects an operation to the neutral position of the main transmission switching operation member (16), and the trunnion shaft detection member (113) is a trunnion shaft (113). 295) When the operation to the neutral position is detected, the seedling transplanter according to claim 2, wherein the planting operation on / off member (25a) is turned on. When the switching operation member (17) is operated, the switching device (571) is switched to a state in which transmission to the traveling vehicle body (2) is cut off, and the planting operation on / off member (25a) is set to a neutral state. Forming an operation position (N), forming the stop planting position (W) on the left and right sides of the neutral operation position (N),
The seedling transplanter according to claim 1 or 2, further comprising a biasing member that biases the switching operation member (17) toward the neutral operation position (N).

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