JP4052974B2 - Paddy field machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a paddy field work machine such as a rice transplanter in which a paddy field work apparatus such as a seedling planting device is connected to a rear portion of a self-propelled machine body so as to be movable up and down.
[0002]
[Prior art]
  In this type of paddy field machine,It is important to stop the paddy field working device when moving backward, and conventionally, a one-way clutch that transmits only forward power to the paddy field working device is provided, and the paddy field working device is stopped when moving backward (for example, patents) Reference 1).
[0003]
  Further, in paddy field machines, a configuration in which a continuously variable transmission for forward and backward switching is provided is often used, and a shift lever for operating the continuously variable transmission, and the up and down movement and driving of the paddy field work device are managed. In order to provide a work lever, conventionally, a shift lever is arranged in the front part of the driver seat, and a work lever is arranged on the left and right side of the driver seat (for example,Patent Document 2reference. ).
[0004]
  Further, in this type of paddy field work machine, backup means for automatically raising the paddy field work apparatus in accordance with the reverse operation of the self-propelled machine body may be employed. And a biasing means for swinging and biasing the work lever that controls the drive to a raised position among a plurality of operation positions, and a member that operates in conjunction with the work lever to act the work lever against the biasing force to each operation position. A detent lever to be held and a shift lever for operating a continuously variable transmission for forward / reverse switching are provided, and an urging force is applied as the shift lever moves from a forward neutral position to a reverse neutral position. Means provided with a link mechanism for operating the detent lever at a detent release position that allows the work lever to swing to the raised position by It has been provided a mechanism for interlocking the detent lever to work the lever using ya. (For example,Patent Document 2reference. ).
[0005]
[0006]
  In addition, in the paddy field work machine, as described above, in order to prevent the unexpected lowering of the paddy field work device, there are often provided a lock valve for preventing drainage from the hydraulic cylinder (for example,Patent Document 2reference. In such a case, conventionally, the lock valve is held at the lock position and the unlock position by frictional force.
[0007]
[Patent Document 1]
        JP 2001-278094 A
[0008]
[Patent Document 2]
        JP 2000-295909 A
[0009]
[Problems to be solved by the invention]
  However, the conventional technique has the following drawbacks.
  When only forward power is transmitted to the paddy field work device via the one-way clutch and the paddy field work device is automatically stopped during reverse travel, the number of transmission elements incorporated in the transmission case increases. As a result, the structure is complicated and large, and the cost is increased.
[0010]
  When the speed change lever is arranged in the front part of the driver seat and the work lever is arranged on the left and right sides of the driver seat, the speed change lever and the work lever are pivotally connected to be swingable around a common axis. Therefore, it is impossible to simplify the lever support structure and reduce the cost by using a common shaft core.
[0011]
  When the detent lever is swung as the shift lever moves from the forward neutral position to the reverse neutral position via the wire and the paddy field work device is automatically raised, the wire will grow with aging. In order to maintain good conditions, it was necessary to perform maintenance such as adjusting the elongation of the wire relatively frequently.
[0012]
[0013]
[0014]
  An object of the present invention is to eliminate the above-mentioned conventional drawbacks.
[0015]
[Means for Solving the Problems]
  The features / actions / effects of the paddy field working machine according to the present invention according to claim 1 are as follows.
[0016]
[0017]
[0018]
[0019]
[0020]
[0021]
[0022]
[0023]
[0024]
〔Characteristic〕
  A paddy field work machine in which a paddy field work device is connected to the rear part of the self-propelled machine body so as to be movable up and down, and a hydrostatic continuously variable transmission that can be switched back and forth to the transmission system to the traveling part of the self-propelled machine body. Providing a work clutch in the transmission system to the paddy field work device, and the work in accordance with the operation movement from the forward neutral position to the reverse neutral position among the shift operation movements of the shift lever for operating the continuously variable transmission A clutch operation link mechanism that cuts and operates the clutch is provided, and the relay link in the speed change interlocking mechanism that interlocks the continuously variable transmission with the speed change operation by the speed change lever on the relay shaft in the clutch operation link mechanism is swingable. It is in the point which is made to support.
[0025]
[Action]
  Because the clutch operation link mechanism is provided so that the work clutch is disengaged and operated as the shift lever moves from the forward neutral position to the reverse neutral position, the paddy field work device is automatically stopped during reverse travel. The one-way clutch, which was necessary in the past, is not necessary while automatically stopping the paddy field work machine when going backward.
  Moreover, the relay shaft in the clutch operation link mechanism is pivotably supported by the relay link in the speed change interlocking mechanism that interlocks the continuously variable transmission with the speed change operation by the shift lever, and the relay shaft is connected to the relay link. Since it is used as a pivot shaft, the member can be shared between the clutch operation link mechanism and the speed change interlocking mechanism.
[0026]
〔effect〕
  Therefore, the structure of the transmission mechanism in the transmission case can be simplified and reduced in size, and the structure of the link mechanism for operation can be simplified and the cost can be reduced by using the members in common.
[0027]
  Claim 2The features / actions / effects of the paddy field working machine according to the present invention are as follows.
[0028]
〔Characteristic〕
  In the paddy field machine according to the present invention according to claim 1,A shift lever for operating a continuously variable transmission for traveling freely switching between forward and backward movement of the self-propelled aircraft body and a work lever for controlling the raising and lowering and driving of the paddy field work device are arranged in the front part of the driver seat, and these The shift lever and the working lever are pivotally supported around the same left-right axis.
[0029]
[Action]
  Since the shift lever and work lever are pivotally supported around the same left-right axis around the front of the driver's seat, the shift lever is designed to simplify the pivot structure by sharing the axis. And the working lever can be pivotally supported.
[0030]
〔effect〕
  Therefore, the structure of the shift lever and the operation lever can be easily supported.
[0031]
  Claim 3The features / actions / effects of the paddy field working machine according to the present invention are as follows.
[0032]
〔Characteristic〕
  The paddy field work machine according to the second aspect of the present invention is characterized in that the traveling control lever system for the traveling portion of the self-propelled machine body includes a sub-transmission lever for operating the transmission lever and the sub-transmission device for traveling, A hydraulic lock lever for operating a lock valve that prevents the lowering of the paddy field work device by closing an oil passage to a hydraulic cylinder that lifts and lowers the work lever and the paddy field work device in the work operation lever system for the work device; SaidTraveling lever systemof Levers and the aboveWork control lever systemLeversAnd are arranged in a distributed manner on the left and right.
[0033]
[Action]
  Of the travel control lever systemLeversAnd planting lever systemLeversAre arranged to the left and right, so the travel control lever systemLeversIs summarized in the travel control lever system and planting control lever systemLeversCan be gathered together with a planting operation lever system to reduce the messiness associated with traveling operation and planting operation.
[0034]
〔effect〕
  Therefore, the running operation and the planting operation can be performed with good operability.
[0035]
  Claim 4The features / actions / effects of the paddy field working machine according to the present invention are as follows.
[0036]
〔Characteristic〕
  In the paddy field working machine according to the present invention according to claim 1 or 2, 3,A biasing means that swings and biases a work lever that controls the raising and lowering and driving of the paddy field working device to a raised position among a plurality of operation positions, and a biasing force that acts on an arm member that is linked to the work lever. A detent lever that is held at each operation position against the above and a shift lever for operating a continuously variable transmission for traveling that can be switched forward and backward are provided. A link mechanism is provided to operate the detent lever at a detent release position that allows the work lever to swing to the raised position due to the urging force as the operation moves to the reverse neutral position. This link mechanism is integrated with the detent lever. A passive arm is integrally connected to one end of the operating shaft that swings in the middle. The passive arm and the shift lever are detented by operating the shift lever to the reverse neutral position. In that it is configured to provide a rod for interlocking so as to swing the location.
[0037]
[Action]
  As a link mechanism that operates the detent lever to the detent release position as the shift lever moves from the forward neutral position to the reverse neutral position, a passive arm is integrally connected to one end of the operating shaft that swings integrally with the detent lever. Since a non-wire-use link mechanism is provided which is configured by providing a rod for interlocking the passive arm and the speed change lever, the deterioration is very small with the aging of the interlock.
[0038]
〔effect〕
  Accordingly, the so-called link mechanism for raising the paddy field work apparatus during reverse travel can be made maintenance-free, and the maintainability of the link mechanism can be improved.
[0039]
[0040]
[0041]
[0042]
[0043]
[0044]
[0045]
[0046]
[0047]
DETAILED DESCRIPTION OF THE INVENTION
  As shown in FIG. 1 and FIG. 2, a riding type rice transplanter, which is an example of a paddy field work machine, has a four-row seedling planting device 2, which is an example of a paddy field work device, at the rear of the self-propelled machine 1. It is connected via a link mechanism 3 so as to be able to move up and down, and is provided with a hydraulic cylinder 4 that raises the seedling planting device 2 with pressure oil supply and lowers the seedling planting device 2 by weight with oil drainage, and is provided with a fertilizer application device Has been.
[0048]
  The self-propelled airframe 1 has an engine 8 mounted on the front portion of a body frame 7 having a pair of left and right driving front wheels 5 and a pair of left and right driving rear wheels 6, and is driven at the rear of the body frame 7. The seat 9 is mounted, and the boarding step 10 is attached to the body frame 7.
[0049]
  The seedling planting device 2 prepares a planting planned farm scene by sliding the farm scene with the seedling platform 2A that reciprocates left and right with a set stroke in a state where a plurality of seedlings are mounted side by side. A plurality of leveling floats 2B on the left and right sides, and in conjunction with the movement of the seedling setting stage 2A, are circulated between the seedling take-out port from the seedling setting stage 2A and the field where the leveling planting is planned to be performed on the seedling setting stage 2A. A seedling planting mechanism 2C for taking out and planting seedlings in units of planting units is provided. Of the leveling float 2B, the one located at the center of the left and right swings up and down with respect to the seedling planting mechanism 2C in response to a change in the height of the seedling planting mechanism 2C, that is, a change in contact pressure due to a variation in planting depth. Therefore, it is also used as a ground pressure sensor that detects the planting depth.
  In addition, the seedling planting device 2 is swingably switched between an inclining action posture and an upright storage posture that draws an index line for the next planting run on the field, and is fixed to the upright storage posture as the seedling planting device 2 is raised. A pair of left and right drawing markers 2m is attached.
[0050]
  The fertilizer is applied to each of the right and left sides of each planting line as planting travels. The feeding device 50 is mounted on the rear part of the self-propelled machine 1, and the seedling planting device 2 is used for planting travel. Accordingly, a fertilizer groove is formed on each of the left and right sides of each planting line in the field, and a plurality of right and left groovers 51 for feeding the fertilizer being fed into the groove are mounted and fed from the feeding machine 50. An electric centrifugal blower 53 that generates an air flow for pumping the fertilizer through the supply pipe 52 to the grooving device 51 is mounted on the rear portion of the self-propelled machine body 1. The feeding machine 50 is composed of a fertilizer hopper 50a for storing granular fertilizer and a feeding device 50b for feeding the fertilizer from the fertilizer hopper 50a.
[0051]
  The body frame 7 is constructed by connecting an engine mounting frame 12 to the front part of a transmission case 11 having a transmission unit and a transmission mechanism for the seedling planting device 2 and connecting a rear frame 13 to the transmission case 11. Has been. The rear frame 13 is a frame for attaching the driver's seat 9 and the four-link mechanism 3, and is composed of left and right columns and braces that prevent the columns from falling down.
[0052]
  Each of the driving front wheels 5 is supported by the transmission case 11 via a front axle case 14, and each of the driving rear wheels 6 is a swing case 15 that can swing up and down around a front-left-right axis. Is supported by the mission case 11 so as to be movable up and down. The swing case 15 is urged to swing downward via a suspension spring 16. The front axle case 14 includes a transmission mechanism from the transmission case 11 to the driving front wheel 5, and the swing case 15 includes a transmission mechanism from the transmission case 11 to the driving rear wheel 6.
[0053]
  A steering handle 18 for steering the driving front wheel 5 via a power steering device 17 is disposed in front of the driver seat 9. The power steering device 17 is bolted while being mounted on the upper surface of the mission case 11. The steering handle 18 is mounted on an upper portion of a columnar lever support frame 19 bolted to the power steering device 17.
[0054]
  On one of the left and right side surfaces of the transmission case 11, a hydrostatic continuously variable transmission that is driven by the engine 8 via a belt transmission device 20 and that outputs shifting power into the transmission case 11 can be switched forward and backward. HST) 21 is attached. On the other hand, on the other left and right side surfaces of the transmission case 11, a hydraulic pump 22 that is driven by the input shaft in conjunction with an extended end portion of the input shaft of the continuously variable transmission 21 is mounted.
[0055]
  The transmission case 11 includes a gear shift type sub transmission 23 that shifts the input from the continuously variable transmission 21 in two steps, and a multi-plate type travel that can brake the cylindrical output shaft 23 b of the sub transmission 23. A brake 24, a front wheel differential 25 with a differential lock function that distributes the output of the auxiliary transmission 23 to the left and right driving front wheels 5, a chain transmission 26 that guides the output of the auxiliary transmission 23 rearward, and the chain transmission 26 Left and right steering clutches 27 for intermittently transmitting / receiving outputs to the left and right driving rear wheels 6 are provided as elements of the traveling system transmission mechanism.
[0056]
  In addition, the transmission case 28 is capable of shifting the output to the seedling planting device 2 in three stages of high and low by performing transmission using one of the three transmission gear pairs 28a, and the seedling planting. A torque limiter 29 that automatically cuts off the transmission of the output of the inter-variety transmission device 28 to the lower transmission side when the load of the device 2 exceeds a set value, and the output from the torque limiter 29 to the seedling planting device 2 side A planting clutch 30 that interrupts transmission is internally provided as an element of the planting transmission mechanism.
[0057]
  The planting clutch 30 is energized by a spring S, and when the output shaft rotates to the set phase after the cutting operation force is applied to the clutch cutting operation pin 30a, the clutch cutting operation pin 30a is turned off. The fork 30e has a fixed position stop function for moving to the clutch disengagement position against the urging force and moving the output body 30c away from the input body 30d via the cam mechanism 30b by the clutch disengagement operation pin 30a to cut off the transmission. When the fork 30e is turned off, the output body 30c is immediately moved away from the input body 30d against the urging force by the fork 30e to be turned off, and an immediate stop function for cutting off the transmission regardless of the phase of the output body 30c is provided. ing.
[0058]
  The hydraulic pump 22 generates pressure oil for the hydraulic cylinder 4 and the power steering device 17, and includes a control valve V that controls supply and discharge of hydraulic oil to the hydraulic cylinder 4 and hydraulic oil supply to the hydraulic cylinder 4. It is configured as one hydraulic device together with a lock valve RV that artificially closes the drainage path and prevents the seedling planting device 2 from moving up and down. The spool 31 of the lift valve V is spring-biased on the oil draining side, that is, the descending side.
[0059]
  The speed change operation device for operating the continuously variable transmission 21 is arranged with the speed change lever 33 in the front part of the driver seat 9 in a state where the grip operating part 33a is located on the left or right side of the steering handle 18. The shift lever 33 and the continuously variable transmission 21 are provided with a shift interlocking mechanism.
[0060]
  The shift lever 33 is integrally pivoted around a plate-like base end member 34 mounted on the lever support frame 19 so as to be swingable back and forth about a left-right axis x1 for shifting. It is configured to be movable along a crank-shaped speed change operation path by being mounted so as to be able to swing left and right around an axis y1 for forward / reverse switching orthogonal to the left-right axis x1 in a moving state. It is guided to move along the speed change operation path by a speed change guide plate 35 having a crank-shaped speed change guide groove 35a through which the intermediate portion is inserted.
[0061]
  The speed change operation path includes a forward zone F formed at the forward neutral position fn where the front end is formed at the maximum forward speed position and the rear end at the travel stop, and the rear end is formed at the maximum reverse speed position and the front end stops running. A reverse region R formed at the reverse neutral position rn, and a neutral region N whose left and right ends are formed at the forward neutral position fn and whose left and right other ends are formed at the reverse neutral position rn. That is, the shift lever 33 moves along the forward and backward regions F and R by swinging back and forth about the left-right axis x1, and is neutralized by swinging left and right around the axis y1. It moves along the area N and switches forward and backward.
[0062]
  The shift interlock mechanism pivotally supports a bell crank 36 that is an example of a relay link that is swingable about a left-right axis x3 in the transmission case 11, and one end of the bell crank 36 is interposed via a first interlock rod 37. The base end member 34 is interlockedly connected, and the other end of the bell crank 36 is interlockedly connected to the speed change arm 21A integrally swinging with the trunnion shaft 21a of the continuously variable transmission 21 via the second interlocking rod 38. ing. In other words, the trunnion shaft 21a is moved forward by the rocking movement of the base end member 34 accompanying the forward / backward rocking movement of the speed change lever 33 in the forward movement area F, and the base end member accompanying the forward / backward rocking movement of the speed changing lever 33 in the reverse movement area R. The trunnion shaft 21a is operated in reverse gearing by swinging 34.
[0063]
  In addition, the shift interlock mechanism holds the shift lever 33 at a plurality of shift positions against the return force to the neutral state of the continuously variable transmission 21 in a state in which the shift swing associated with the operation of the shift lever 33 is allowed. That is, detent means is provided for holding the continuously variable transmission 21 in a plurality of shift states.
[0064]
  The detent means includes a plurality of concave portions 39 that are selectively located at specific positions in association with the swinging of the base end member 34 around the axis x1 in the left-right direction. An engagement member 40 made of a leaf spring that automatically and elastically engages with the recess 39 that is in the swinging position and holds the swinging posture of the base end member 34 around the left and right axis x1 against the return force. The shift guide plate 35 is attached.
[0065]
  The auxiliary transmission operating device for operating the auxiliary transmission 23 has an auxiliary transmission lever 41 disposed in the front portion of the driver seat 9 in a posture in which the grip operation portion 41a protrudes backward. An auxiliary transmission interlocking mechanism for interlockingly connecting the auxiliary transmission 23 is provided.
[0066]
  The auxiliary transmission lever 41 is pivotally supported by the lever supporting frame 19 so as to be swingable up and down around the second left and right axis x2.
[0067]
  The sub-transmission interlocking mechanism swings right and left to shift a shift fork 23A that shifts and shifts the shift gear 23a of the sub-transmission device 23 between a low speed position and a high speed position. 11 and a sub-shifting interlocking rod 43 that interlocks the sub-transmission intermediate link 42 and the sub-transmission lever 41 to each other.
[0068]
  The travel brake operating device for operating the travel brake 24 is configured by arranging a brake pedal 44 to be depressed at the left and right other side of the foot portion of the driver seat 9 and rotating around the axis. A brake operation cam shaft 45 is provided for pressing the braking plate group of the traveling brake 24 against the transmission case 11 to actuate the traveling brake 24. When the brake pedal 44 is depressed, the brake operation cam shaft 45 is moved in the brake operating direction. A brake rod 46 is provided for rotation.
[0069]
  A pedal shaft 47 that swings integrally with the brake pedal 44 is disposed so as to cross the transmission case 11, and the brake pedal 44 is attached to one end, and the other end is used for shifting neutral operation. The arm 48 is connected and fixed. The shift neutral operation arm 48 is used to operate the continuously variable transmission 21 to a shift neutral state when the brake pedal 44 is depressed, and is moved forward and backward around the second left-right axis x2. A forced neutral lever 49 pivotally supported is interlocked and connected via a linkage rod 54.
[0070]
  The forced neutral lever 49 is forcibly swung backward in conjunction with the depression of the brake pedal 44, and is disposed above and below the bell crank 36 in the shift interlock mechanism when the forced neutral lever 49 swings backward. By pressing the pair of contact pins 36a and 36b, the bell crank 36 is returned to the neutral position for shifting with the shift lever 33 regardless of whether the bell crank 36 is in the forward shift position or the reverse shift position. It is configured as follows.
[0071]
  The planting clutch 30 and the lift valve 31 are operated in a related manner, and the related operating device is in a state in which the operation lever 55a is positioned on the left and right side of the steering handle 18 by gripping the work lever 55 in the front portion of the driver seat 9. An operation interlocking mechanism is provided to link the planting clutch 30 and the lift valve 31 to the operation movement of the work lever 55 and to link the lift valve 31 to the ground pressure detection operation of the leveling float 2B as the ground pressure sensor. It is configured.
[0072]
  The work lever 55 is attached to an arm member 56 mounted on the lever support frame 19 so as to be able to swing back and forth around a work-oriented horizontal axis x1 so as to be able to swing left and right around a longitudinal axis y2. Thus, it is supported so as to be swingable in the front-rear and left-right directions, and can be moved along a T-shaped guide groove 57 a formed in the guide plate 57.
[0073]
  The T-shaped operation path formed by the guide groove 57a moves and guides the operation lever 55 to the planting position, the lowered position, the neutral position, and the raised position of the rear end at the front end, and the detailed structure is omitted. However, the selection of the drawing marker 2m to be protruded by the left and right operation at the “planting” position at the front end of the path is performed.
[0074]
  When the operation lever 55 is located at the raised position, the work interlocking mechanism operates to disengage the planting clutch 30 and actuate the lift valve 31 to the raised position. When the work lever 55 is located at the neutral position, the planting clutch 30 is operated. When the operation lever 55 is in the lowered position and the work lever 55 is in the lowered position, the planting clutch 30 is turned off and the planting depth is set in preference to the work lever 55. The lift valve 31 is operated based on the ground pressure detection operation of the leveling float 2B for maintaining the ground level float 2B, and when the work lever 55 is located at the planting position, the planting clutch 30 is engaged and activated, and the work lever 55 is prioritized. The lifting / lowering valve 31 based on the ground pressure detection operation of the leveling float 2B for maintaining the planting depth within the set range. It is a mechanism to perform the work.
[0075]
  Specifically, the first rod 61 pushed and pulled as the work lever 55 swings around the left and right axis x1 is engaged and interlocked with the first rod 61 from the lowered position of the work lever 55. An intermediate link 62 that swings in one direction due to the movement of the first rod 61 accompanying the swing to the neutral position and the swing from the neutral position to the raised position, and the swing of the intermediate link 62 in the one direction. A second rod 63 for cutting and operating the clutch disconnection operation pin 30a of the planting clutch 30 is provided, and the planting clutch 30 is configured to be disconnected and operated when the operation lever 55 is in the neutral position and the raised position. In addition, the engagement hole 64 with the first rod 61 of the intermediate link 62 has a swing of the work lever 55 from the neutral position to the lowered position and the swing of the first rod 61 from the lowered position to the planting position. It is formed in a long hole that maintains the planting clutch 30 in the engaged state without swinging the intermediate link 62 regardless of the movement.
[0076]
  In addition, the relay link 66 interlocked with the leveling float 2B via the wire 65, the third rod 67 pushed and pulled by the swing of the relay link 66, and swung by being pushed and pulled by the third rod 67. Thus, an operation link 68 for switching the lifting valve 31 is provided, and the ground pressure is maintained within the set range in conjunction with the vertical movement of the leveling float 2B, that is, the planting depth is within the set range. Configured to maintain.
[0077]
  When the work lever 55 is operated to the neutral position, the operation link 68 is operated to the neutral position against the bias, and when the work lever 55 is operated to the lowered position, the operation link 68 is biased. The first rod 61 is engaged with the operation link 68 so as to be operated to the lowered position against the operation. The engagement hole 69 of the operation link 68 with the first rod 61 is formed as a long hole that allows the operation link 67 to swing for valve operation when the operation lever 55 is positioned at the lowered position and the planting position. ing.
[0078]
  The lock valve RV is operated via a hydraulic lock lever 70 pivotally supported on the lever support frame 19 so as to be swingable about the left-right axis x2. The means for interlocking the hydraulic lock lever 70 and the lock valve RV is means for interlocking the operation lever 32 of the lock valve RV and the hydraulic lock lever 70 via the interlock rod 71, and the operation lever 32a and the lock valve RV. The detent mechanism that holds the hydraulic lock lever 70 in the locked position and the unlocked position in a state in which the swinging associated with the operation of the hydraulic lock lever 70 is allowed between the valve box and the valve box VC of the hydraulic device. Is provided. That is, this detent mechanism is configured with the valve box VC as a constituent element, and specifically, at a location corresponding to the operation lever 32 in the direction along the lever axis of the valve box VC. When the ball 72 is held in a direction along the lever shaft so as to be freely retractable and a spring 73 is provided to project and urge the ball 72, the operation lever 32 is swung to the lock position. A locking recess 74 for engaging the ball 72 and a release recess 75 for engaging the ball 72 when the operation lever 32 swings to the unlocking position are formed. The operation lever 32 is held in the locked position by the engagement of the ball 72, and the operation lever 32 is held in the unlocked position by the engagement of the ball 72 with the release recess 75.
[0079]
  Further, the working lever 55 is oscillated and urged to the raised position at the rear end of the operation path by the urging means 79, and is held at each operation position via the detent means. Here, the urging means 79 is constituted by a hydraulic damper spring that swings the working lever 55 toward the raised position at a slow speed. The detent means holds the work lever 55 at each operation position against the urging force of the urging means 79 in a state in which the swing associated with the operation of the work lever 55 is allowed. A recess 76 is formed in each part of the member 56 that corresponds to the fixed specific position when the work lever 55 swings to each operation position, and the recess 56 is swung around the left and right axis x2. A detent lever 77 for holding the arm member 56 in its operating position is provided by engaging and disengaging the one corresponding to the fixed specific portion of 76 through an engagement pin 77a. Is provided with a detent spring 78 for moving and biasing in the engagement direction.
[0080]
  In the shift operation movement of the shift lever 33, the detent release position that allows the work lever 55 to swing to the raised position by the urging force in accordance with the operation movement from the forward neutral position fn to the reverse neutral position rn. A link mechanism that operates the detent lever 77 and a clutch operation link mechanism that disconnects and operates the planting clutch 30 as the shift lever 33 is operated from the forward neutral position fn to the reverse neutral position rn are provided. .
[0081]
  The link mechanism and the clutch operation link mechanism are configured to share members. These are provided with a rod 80 that reversibly moves downward as the shift lever 33 swings about the axis y1 from the forward neutral position fn to the reverse neutral position rn. The passive arm 81 that is engaged and interlocked with the pin 80a and swings downward about the left and right axis x2 in accordance with the downward movement of the pin 80a is connected to the operation shaft 82 that swings integrally with the detent lever 77. It is configured to be integrally connected to one end. The pivot connection hole 81a with the pin 80a of the passive arm 81 allows a single swing of the detent lever 77 accompanying an operation on the work lever 55 in a state in which the speed change lever 33 is positioned in the forward travel region F. It is formed in a long hole in the vertical direction.
  Further, one end of the relay shaft 83 pivotally supported by the bell crank 36 of the speed change interlocking mechanism is pivotably connected to a driven arm 84 pivotally connected to the lower end of the rod 80 so as to integrally swing. At the other end of the relay shaft 83, a clutch operating arm 85 that engages and disengages the fork 30e of the planting clutch 30 is fixedly connected to an operating arm 87 that is interlocked via an interlocking rod 86 so as to integrally swing. ing. That is, as the rod 80 moves downward, the clutch operating arm 85 is swung from the on position to the off position.
  In short, as the shift lever 33 is operated from the forward neutral position fn to the reverse neutral position rn, the planting clutch 30 is immediately turned off and the seedling planting device 2 is raised.
[0082]
  In addition, the transmission lever 33 and the work lever 55 are swingable about the same left and right axis x1, and the auxiliary transmission lever 41, the forced neutral lever 49, the hydraulic lock lever 70, and the detent. The lever 77 is swingable about the same left-right axis x2 and simplifies the structure by sharing the axes x1 and x2.
[0083]
  A travel operation lever system including the speed change lever 33 and the auxiliary speed change lever 41 is disposed on the left and right sides of the self-propelled machine body 1, and a work operation lever system including the work lever 55 and the hydraulic lock lever 70 is It is arranged on the left and right other side of the self-propelled aircraft 1.
[Brief description of the drawings]
[Fig. 1] Overall side view of a riding rice transplanter
[Fig. 2] Overall plan view of the riding rice transplanter
[Figure 3] Front view of the self-propelled aircraft
[Fig. 4] Overall plan view of the transmission system
[Figure 5] Left side view of the front of the aircraft
[Fig. 6] Right side view of the self-propelled aircraft
[Fig. 7] Plan view across a part of the mission case
FIG. 8 is a cross-sectional plan view showing a part of the rear wheel transmission system.
FIG. 9 is a side view showing a shifting operation structure for traveling.
FIG. 10 is a side view showing a lifting operation structure.
FIG. 11 is a rear view of the operation structure around the steering wheel.
FIG. 12 is a plan view of a planting clutch operating structure.
FIG. 13 is a plan view showing a lever guide portion around a steering handle.
FIG. 14 is a side view of a control valve.
FIG. 15 is a cross-sectional view of a detent mechanism for a lock valve
[Explanation of symbols]
  1 Self-propelled aircraft
  2 Paddy field equipment
  4 Hydraulic cylinder
  70 Hydraulic lock lever
  23 Sub-transmission
  41 Sub-shift lever
  21 continuously variable transmission
  33 Shift lever
  48 Shifting neutral operation arm
  55 Working lever
  56 Arm members
  77 Detent lever
  9 Driver's seat
  79 Energizing means
  82 Operation axis
  81 Passive arm
  80 rod
  30 Working clutch
  83 Relay shaft
  36 Relay link
  x1 Left-right axis
  x2 shaft core
  fn Forward neutral position
  rn Backward neutral position
  RV lock valve
  VC valve box

Claims (4)

A paddy field work machine in which a paddy field work device is connected to the rear part of the self-propelled machine body so as to be movable up and down,
A hydrostatic continuously variable transmission that can be switched forward and backward is provided in the transmission system to the traveling part of the self-propelled machine body, a working clutch is provided in the transmission system to the paddy field working device, and the continuously variable transmission is operated. the clutch operating link mechanism for actuating off the working clutch from the forward neutral position of the shift operation moves with the operation moves to the reverse neutral position of the shift lever provided for, the relay shaft in the clutch operating link mechanism, shift A paddy field work machine that pivotally supports a relay link in a speed change interlocking mechanism that interlocks a continuously variable transmission with a speed change operation by a lever. A shift lever for operating a continuously variable transmission for traveling freely switching between forward and backward movement of the self-propelled aircraft body and a work lever for controlling the raising and lowering and driving of the paddy field work device are arranged in the front part of the driver seat, paddy working machine according to claim 1, wherein swingably are pivoted to the shift lever and the working lever and the same laterally extending axis around. The travel control lever system for the traveling portion of the self-propelled machine body is provided with a sub-transmission lever for operating the shift lever and the travel sub-transmission device, and the work lever and the paddy field are included in the work operation lever system for the paddy field work device. A hydraulic lock lever for operating a lock valve for preventing the lowering of the paddy field work device by closing an oil passage to a hydraulic cylinder for raising and lowering the work device, and levers of the travel operation lever system and the work operation lever system The paddy field work machine according to claim 2 , wherein the levers are arranged in a left-right manner. A biasing means that swings and biases a work lever that controls the raising and lowering and driving of the paddy field working device to a raised position among a plurality of operation positions, and a biasing force that acts on an arm member that is linked to the work lever. A detent lever that is held at each operation position against the above and a shift lever for operating a continuously variable transmission for traveling that can be switched forward and backward are provided. A link mechanism is provided to operate the detent lever at a detent release position that allows the work lever to swing to the raised position due to the urging force as the operation moves to the reverse neutral position. This link mechanism is integrated with the detent lever. A passive arm is integrally connected to one end of the operating shaft that swings in the middle. The passive arm and the shift lever are detented by operating the shift lever to the reverse neutral position. Paddy working machine according to claim 1 which is formed by providing a rod to link to swing location.

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