JP2015047146A - Paddy field working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paddy field working machine capable of rationally performing assembly of a gear shift lever to a gear shift operation rod for performing a gear shift operation of a gear shift mechanism that changes intervals of ground working by a working apparatus.SOLUTION: A paddy field working machine includes: an engine; a machine body frame; a transmission case M fixed to the machine body frame; a seedling planting apparatus; a first gear shift mechanism provided inside the transmission case M that changes intervals of seedling planting by the seedling planting apparatus by gear-shifting the power from the engine to a plurality of stages; a first gear shift operation rod 26 protruded outward from the transmission case M for performing a gear shift operation of the first gear shift mechanism; and a first gear shift lever 28 interlocked and connected to the first gear shift operation rod 26. The first gear shift lever 28 is supported by the transmission case M.

Description

  The present invention relates to a paddy field work machine provided with a speed change mechanism that changes an interval of ground work by a work device by shifting power from an engine in a plurality of stages.

  An example of the paddy field machine is described in Patent Document 1, for example. In the paddy field machine described in Patent Document 1, a transmission mechanism is arranged in the transmission case to change the ground work interval by the work device by shifting the power from the engine in a plurality of stages. A speed change rod for shifting the speed change mechanism ("Patent speed control rod [43]" in Patent Document 1) protrudes outward from the transmission case. The “inter-stock shift lever [46]”) is interlocked. When the speed change lever is swung, the speed change operation rod linked to the speed change lever is operated, and the speed change operation of the speed change mechanism is performed by the speed change operation rod.

Japanese Patent No. 4274969 (FIGS. 10, 11, etc.)

  In the conventional paddy field work machine, the speed change lever is supported by the body frame, so that the gear shift lever is linked to the speed change operation rod protruding outward from the transmission case after the transmission case is fixed to the body frame. . For this reason, for example, if there is an attachment error between the fuselage frame and the transmission case, a position adjustment operation is required when the speed change lever is linked and connected to the speed change operation rod. Further, when the speed change lever is interlocked and connected to the speed change operation rod, the work space may be limited by the body frame or the like, which may require time and effort for assembly.

  In view of the above situation, it has been desired to provide a paddy field work machine capable of rationally assembling the speed change lever with respect to the speed change operation rod for speed changing the speed change mechanism that changes the interval of the ground work by the work device.

  A paddy field work machine according to the present invention includes an engine, a body frame, a mission case fixed to the body frame, a work device that performs ground work, and a power supply from the engine. A speed change mechanism that changes the interval of ground work by the working device by shifting to a stage, a speed change operation rod that protrudes outward from the transmission case to change speed of the speed change mechanism, and is linked to the speed change operation rod. And a shift lever that is supported by the transmission case.

According to the present invention, the speed change mechanism that shifts the power from the engine to a plurality of stages and changes the ground work interval by the work device is disposed in the transmission case, and the speed change operation rod for performing the speed change operation of the speed change mechanism Protrudes outward from the mission case. A speed change lever is linked to the speed change rod, and the speed change lever is supported by a transmission case that supports the speed change rod. That is, before the transmission case is fixed to the body frame, the shift lever can be linked to the shift operation rod. For this reason, it is possible to eliminate an increase in labor due to an attachment error between the airframe and the transmission case when the transmission lever is interlocked and connected to the transmission operation rod. And, since there is no thing that restricts the work space such as the fuselage frame around the transmission case, the interlocking operation of the shift lever with respect to the shift operation rod can be performed, so that the efficiency of the assembly work can be improved.
As described above, according to the present invention, the shift lever can be rationally assembled to the shift operation rod that shifts the shift mechanism that changes the interval of the ground work by the work device.

  In the above-described configuration, it is preferable that a support member fixed to the transmission case is provided, and the shift lever is supported by the support member so as to be rotatable around a vertical axis.

  According to this configuration, since the transmission lever is supported by the transmission case via the support member, the design change of the arrangement mode of the transmission lever is facilitated by the support member. Moreover, for example, since the shift lever is supported by the support member so as to be rotatable about the vertical axis, the shift lever can be easily configured to be swingable along, for example, the surface of the boarding step. For this reason, the shift lever can be assembled so that the operability is good and is supported stably.

  In the above configuration, the speed change operation rod protrudes outward from the lateral side surface of the transmission case, and the speed change mechanism is operated to change speed by sliding movement of the speed change operation rod in the lateral direction of the machine body. It is preferable that

  According to this configuration, the speed change operation rod protrudes from the lateral side surface of the transmission case, and the speed change operation of the speed change mechanism is performed by sliding in the body lateral direction of the speed change operation rod. Generally, there are relatively few obstacles on the lateral side of the mission case. For this reason, the speed change rod protrudes from a place with few obstacles, and the speed change lever is linked to such speed change operation rod. Can be placed.

The whole side view of a riding type rice transplanter. The whole top view of a riding type rice transplanter. A side view of a mission case. The perspective view which shows the periphery of an operation groove. The top view of the periphery of a 1st transmission lever and a 2nd transmission lever. The disassembled perspective view of the periphery of a 1st transmission lever. The exploded perspective view of the circumference of the 2nd speed change lever. A diagram of a driving transmission system. Diagram of planting transmission system. Sectional drawing of the periphery of a 1st transmission mechanism and a 2nd transmission mechanism. Sectional drawing of the periphery of a travel output shaft.

[Schematic configuration of riding rice transplanter]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a riding type rice transplanter as an example of the “paddy field machine” of the present invention. This riding type rice transplanter includes a traveling machine body 13 that is self-propelled by a pair of left and right steering and driveable front wheels 11 and a pair of left and right driveable rear wheels 12, and an engine E mounted on the traveling machine body 13; The link mechanism 14 supported by the rear part of the traveling machine body 13 so as to be movable up and down, the hydraulic cylinder 15 that drives the link mechanism 14 to move up and down, and the eight-row planting seedling planting device 16 supported up and down by the link mechanism 14 ( An example of a “working device”. The riding type rice transplanter is configured to perform planting work of seedlings such as rice on the field as “ground work” by the seedling planting device 16.

  As shown in FIGS. 1, 2, and 9, the seedling planting device 16 has a seedling placing stand 17 on which seedlings are placed, and seedling planting in which seedlings placed on the seedling placing stand 17 are planted on a field surface. A mechanism 18, a grounding float 19 and the like are provided. The seedling planting mechanism 18 includes four transmission cases 20. A pair of left and right rotary cases 21 are rotatably supported at the rear of each transmission case 20. Each rotary case 21 is provided with a pair of planting arms 22. A planting claw 23 is attached to each planting arm 22.

  In the seedling planting mechanism 18, when the rotary case 21 is driven to rotate, the rotary case 21 and the planting arm 22 are rotated around the rotational axis of the rotary case 21 and the rotary case 21 is not illustrated. The planting arm 22 is rotated with respect to the rotary case 21 by driving by the arm driving mechanism. Thereby, one stock from the lower end portion of the mat-like seedlings placed on the seedling placing stand 17 alternately by the planting claws 23 of one planting arm 22 and the planting claws 23 of the other planting arm 22. Minute block seedlings are cut and taken out and transported to the planting soil surface for planting.

  As shown in FIGS. 1 and 2, a transmission case M is fixed to the body frame 25 of the traveling body 13. In the mission case M, by changing the ratio of the planting speed to the traveling speed in the seedling planting device 16 in a plurality of stages, the seedling planting interval (between plants) by the seedling planting device 16 is increased or decreased to a plurality of types of distances. And a second transmission mechanism S2 (an example of a “transmission mechanism”) (see FIGS. 9 and 10; details will be described later). The first speed change mechanism S1 is configured to perform a two-stage speed change operation, and the second speed change mechanism S2 is configured to be capable of a four-speed speed change operation. The speed change operation of the first speed change mechanism S1 is performed by a first speed change operation rod 26 (an example of a “speed change operation rod”). The speed change operation of the second speed change mechanism S2 is performed by a second speed change operation rod 27 (an example of a “speed change operation rod”). As shown in FIGS. 3, 5, and 6, a first speed change lever 28 (an example of a “speed lever”) is interlocked with the first speed change operation rod 26. As shown in FIGS. 3, 5, and 7, a second shift lever 29 (an example of a “shift lever”) is interlocked with the second shift operation rod 27.

[Connection structure of first speed change rod and first speed change lever]
As shown in FIGS. 3, 5, 6, 9, and 10, the first speed change operation rod 26 has one end linked to the first speed change mechanism S <b> 1 inside the transmission case M, and the other end. The side protrudes outward from the right lateral surface of the mission case M. The first speed change operation rod 26 is adapted to perform a speed change operation of the first speed change mechanism S1 by sliding in the lateral direction of the machine body. A first tip hole 26 a is formed at the tip of the first speed change operation rod 26 in the vertical direction.

  As shown in FIGS. 3 and 6, the right side surface of the mission case M has a U-shaped plate-shaped first support member 30 (“support member” with a convex portion on the lateral side of the fuselage on the mission case M side. Is fixed). The first support member 30 has an attachment part 31, an upper side part 32, and a lower side part 33. The attachment portion 31 is fastened and fixed to the right lateral surface of the transmission case M by two bolts 35 that are laterally aligned in the vertical direction. The upper side portion 32 is bent at a substantially right angle from the upper end portion of the attachment portion 31, and extends toward the lateral outer side of the body so that the plate surface is along the longitudinal direction of the body. The lower side portion 33 is bent at a substantially right angle from the lower end portion of the attachment portion 31, and extends toward the lateral side of the body so that the plate surface is along the longitudinal direction of the body. The upper side portion 32 is formed with a circular first upper hole portion 32a oriented in the vertical direction. The lower side portion 33 is formed with a circular first lower hole portion 33a facing in the vertical direction.

  As shown in FIGS. 3, 5, and 6, a first arm member 37 is engaged with the first speed change operation rod 26. The first arm member 37 has a U-shaped plate shape with a convex portion on the front side of the machine body. The first arm member 37 includes a plate-like upper fixing portion 38 whose plate surface extends in the longitudinal direction of the machine body, and a plate-like lower fixing portion 39 disposed substantially parallel to the upper fixing portion 38. The upper fixed portion 38 is formed with a first upper elongated hole 38a opened in the vertical direction with the radial direction of the circle centering on the first vertical axis X1 (an example of “vertical axis”) as the longitudinal direction. ing. The lower fixed portion 39 is formed with a first lower elongated hole 39a opened in the vertical direction with the radial direction of the circle centered on the first vertical axis X1 as the longitudinal direction. The first upper long hole 38a and the first lower long hole 39a overlap each other in plan view. The top end portion of the first speed change operation rod 26 is sandwiched in the vertical direction by the upper fixing portion 38 and the lower fixing portion 39. The first support pin 40 is inserted in the vertical direction across the first upper long hole 38a, the first tip hole 26a, and the first lower long hole 39a. A circular upper insertion hole 38b facing in the up-down direction is formed in the front side portion of the upper fixing portion 38. A circular lower insertion hole 39b facing in the up-down direction is formed in the front side portion of the lower fixing portion 39.

  As shown in FIG. 6, the first upper hole portion 32a, the first lower hole portion 33a, the upper insertion hole 38b, and the lower insertion hole 39b are positioned on the first vertical axis X1.

  As shown in FIGS. 3 and 6, the first speed change lever 28 is formed by bending a rod having a circular cross section, and is attached to the transmission case M via the first support member 30 and the first arm member 37. It is supported. The first speed change lever 28 includes a rotation part 41, an arm part 42, and an operation part 43. The rotating portion 41 extends in the vertical direction, and is inserted through the first upper hole portion 32a, the first lower hole portion 33a, the upper insertion hole 38b, and the lower insertion hole 39b. The rotating part 41 is fixed to and integrated with the first arm member 37 by welding or the like in the vicinity of the upper insertion hole 38b and the lower insertion hole 39b. The arm portion 42 is bent in a direction in which the upper end portion of the rotating portion 41 is separated from the transmission case M, and extends in a substantially horizontal shape toward the lateral outer side of the body. The operation portion 43 is bent upward from the lateral outer end of the arm portion 42 and extends along the vertical direction. Thus, the first speed change lever 28 is supported by the transmission case M so as to be swingable around the first vertical axis X1.

  According to such a structure, when the first speed change lever 28 is swung around the first vertical axis X 1, the first arm member 37 is swung integrally with the first speed change lever 28, and the first arm member 37 is moved. In conjunction with this, the first speed change operation rod 26 is slid in the lateral direction of the machine body, and the first speed change operation rod 26 is moved out of the mission case M. As a result, the four shift positions of the first transmission mechanism S1 can be switched.

  As shown in FIG. 6, in order to interlock the first speed change lever 28 to the first speed change operation rod 26, first, the first support member 30 is fastened and fixed to the outer surface of the transmission case M with bolts 35. Then, by inserting the first support pin 40 through the first upper elongated hole 38a and the first lower elongated hole 39a of the first arm member 37 and the first tip hole 26a of the first speed change operating rod 26, One arm member 37 and the first speed change operation rod 26 are engaged. Then, after the rotation portion 41 of the first shift lever 28 is inserted into the first upper hole portion 32 a of the upper side portion 32 of the first support member 30, a pair of upper insertion holes 38 b on the upper and lower sides of the first arm member 37 and the lower It is inserted through the insertion hole 39 b and inserted into the first lower hole portion 33 a of the lower side portion 33 of the first support member 30. Then, the first shift lever 28 and the first arm member 37 are fixed by welding. Thereby, the interlocking connection of the first speed change lever 28 to the first speed change operation rod 26 is completed. As described above, since the first speed change lever 28 is supported by the transmission case M, the first speed change lever 28 with respect to the first speed change operation rod 26 in a state where the transmission case M is not yet attached and fixed to the body frame 25. It is possible to perform the interlocking connection work.

  As shown in FIG. 3, the first support member 30, the first arm member 37, and the substantially entire portion of the first shift lever 28 are positioned below the boarding step 45 that forms a substantially horizontal surface. doing. In order to operate the first speed change lever 28, the boarding step 45 is formed with an operation groove 45a that exposes the operation portion 43 of the first speed change lever 28, as shown in FIGS. The operation groove 45a has an arcuate shape that is located forward along the swing direction of the operation portion 43 of the first speed change lever 28 from the inner side of the airframe toward the outer side of the airframe.

  As shown in FIGS. 2 and 4, a flexible sheet-like floor mat 46 is laid on the upper surface of the boarding step 45. Usually, the operation groove 45 a and the first speed change are performed on the floor mat 46. The operation part 43 of the lever 28 is covered. The floor mat 46 has a lid portion 46a positioned in the vicinity of the upper side of the operation groove 45a by cutting. By turning up the lid portion 46a, the operation groove 45a and the operation portion 43 of the first speed change lever 28 can be exposed as necessary.

[Display label]
As shown in FIG. 4, a display label 47 is attached to the boarding step 45 in the vicinity of the operation groove 45a so as to follow the arc shape of the operation groove 45a. The display label 47 is divided into two cases when the stock is widened and the stock is narrowed by the second speed change mechanism S2, and each of the four levels according to the number of steps of the first speed change mechanism S1 is displayed. Information indicating the distance of the planting interval (between stocks) of the displayed stock is displayed.

[Connection structure of second speed change rod and second speed change lever]
As shown in FIGS. 3, 5, 7, 9, and 10, the second speed change operation rod 27 has one end linked to the second speed change mechanism S <b> 2 inside the transmission case M, and the other end. The side protrudes outward from the right side surface of the mission case M. The second speed change operation rod 27 performs a speed change operation of the second speed change mechanism S2 by sliding in the lateral direction of the machine body. A second tip hole 27 a is formed at the tip of the second speed change rod 27 in the vertical direction. Further, a second support member 50 (an example of a “support member”) that is located in front of the second speed change operation rod 27 in the mission case M and that projects integrally outward with the mission case M is vertically A circular through hole 50a facing the direction is opened.

  As shown in FIGS. 3 and 7, the second speed change lever 29 has a lever portion 51 and a second arm member 52. The lever portion 51 is formed in a bar shape facing the aircraft body. The second arm member 52 has a U-shaped plate shape in a side view with the front side of the machine body as a convex portion. The convex portion of the second arm member 52 is welded and fixed to the rear end portion of the lever portion 51 to be integrated. The second arm member 52 has an upper surface portion 53 and a lower surface portion 54. A circular second upper hole portion 53a facing in the up-down direction is opened in the upper surface portion 53 at a location on the inner side of the aircraft in the middle in the longitudinal direction of the aircraft. A circular second lower hole portion 54a facing in the up-down direction is opened in the lower surface portion 54 at a position on the inner side of the aircraft in the middle in the longitudinal direction of the aircraft. Further, the upper surface 53 has a radial direction of a circle centered on the second vertical axis X2 (an example of “vertical axis”) as a longitudinal direction at a laterally inner portion of the rear part in the longitudinal direction of the aircraft, A second upper long hole 53b opened in the vertical direction is opened. In the lower surface portion 54, a second lower long hole opened in the vertical direction with the radial direction of the circle centering on the second vertical axis X2 as the longitudinal direction at the laterally inner portion of the rear portion in the longitudinal direction of the aircraft. 54b is opened. Between the upper surface portion 53 and the lower surface portion 54, the second speed change operating rod 27 is sandwiched in the vertical direction, and the second support member 50 of the transmission case M is sandwiched.

  As shown in FIG. 7, the second upper hole portion 53a, the through hole 50a, and the second lower hole portion 54a are located on the second vertical axis X2. A second support pin 55 that faces in the vertical direction is inserted through the second upper hole portion 53a, the through hole 50a, and the second lower hole portion 54a in a state in which the second support pin 55 is prevented from coming off. A third support pin 56 facing the up and down direction is inserted through the second upper long hole 53b, the second tip hole 27a, and the second lower long hole 54b in a state of being prevented from coming off. Thus, the second speed change lever 29 is supported by the transmission case M so as to be swingable around the second vertical axis X2.

  According to such a structure, when the second speed change lever 29 is swung around the second vertical axis X2, the second speed change rod 27 is slid in the lateral direction by the second arm member 52 of the second speed change lever 29. Then, the second speed change operation rod 27 is moved out of the mission case M. Thereby, the two-stage shift position of the second transmission mechanism S2 can be switched.

  As shown in FIG. 7, in order to interlock the second speed change lever 29 to the second speed change operation rod 27, the second arm member 52 of the second speed change lever 29 is connected to the second speed change operation rod 27. Engage with the support pin 55 and engage with the second support member 50 of the mission case M with the third support pin 56 to complete. As described above, since the second speed change lever 29 is supported by the transmission case M, the second speed change lever 29 with respect to the second speed change operation rod 27 in a state where the transmission case M is not yet attached and fixed to the body frame 25. It is possible to perform the interlocking connection work.

The transmission structure of the riding type rice transplanter including the first transmission mechanism S1 and the second transmission mechanism S2 will be described in detail below. First, the transmission structure of the traveling system will be described.
[Transmission structure of traveling system]
As shown in FIG. 8, a pair of left and right front axle cases 60 </ b> F are provided on the left and right sides of the transmission case M. The front wheel case 60F supports the front wheel 11 so that the front wheel 11 can rotate and rotate around an axis along the vertical direction.

  A hydrostatic continuously variable transmission 61 is connected to the transmission case M in a state of being located on the left side on the upper side of the transmission case M. The hydrostatic continuously variable transmission 61 has a neutral stop position, and is configured to be steplessly variable from the neutral stop position to the forward side and the reverse side. The hydrostatic continuously variable transmission 61 has a transmission input shaft 61a and a transmission output shaft 61b that extend to the outside. The power of the engine E is transmitted to the transmission input shaft 61a of the hydrostatic continuously variable transmission 61 through the belt transmission mechanism 61c. The portion of the transmission input shaft 61a located on the opposite side of the belt transmission mechanism 61c and the transmission output shaft 61b are disposed so as to enter the inside of the transmission case M.

  A hydraulic pump 62 is connected to the right side portion of the transmission case M. The pump input shaft 62 a of the hydraulic pump 62 is disposed so as to enter the inside of the mission case M. The pump input shaft 62a is arranged concentrically with the speed change output shaft 61b, and is splined so as to rotate integrally with the speed change output shaft 61b by an extension input shaft 61d. As a result, the power of the engine E is transmitted from the transmission input shaft 61a of the hydrostatic continuously variable transmission 61 to the hydraulic pump 62, and the hydraulic pump 62 is driven.

  A first transmission shaft 63 that is rotatably supported inside the transmission case M is splined to the transmission output shaft 61b. The first transmission shaft 63 is provided with a first shift gear 64 that rotates integrally with the first transmission shaft 63 and is slidable with respect to the first transmission shaft 63 by a spline structure. . The first shift gear 64 is integrally provided with a first high speed gear 64a and a first low speed gear 64b having a diameter larger than that of the first high speed gear 64a.

  On the lower transmission side of the first transmission shaft 63, a second transmission shaft 65 parallel to the first transmission shaft 63 is supported and provided in the transmission case M. The second transmission shaft 65 is provided with a large-diameter gear 65 a and a medium-diameter gear 65 b smaller in diameter than the large-diameter gear 65 a fixed to the second transmission shaft 65. By shifting the first shift gear 64, one of the meshing of the first high speed gear 64a and the large diameter gear 65a and the meshing of the first low speed gear 64b and the medium diameter gear 65b is selected. Power can be transmitted from the transmission shaft 63 to the second transmission shaft 65. A small-diameter gear 65c having a smaller diameter than the medium-diameter gear 65b is fixed to the second transmission shaft 65.

  On the lower transmission side of the second transmission shaft 65, a third transmission shaft 67 parallel to the second transmission shaft 65 is supported and provided in the transmission case M. The third transmission shaft 67 is provided with a second shift gear 68 that rotates integrally with the third transmission shaft 67 and is slidable with respect to the third transmission shaft 67 by a spline structure. . The second shift gear 68 is integrally provided with a second high speed gear 68a and a second low speed gear 68b having a diameter larger than that of the second high speed gear 68a. By shifting the second shift gear 68, either the meshing of the medium-diameter gear 65b and the second high-speed gear 68a or the meshing of the small-diameter gear 65c and the second low-speed gear 68b is selected and the second transmission is selected. Power can be transmitted from the shaft 65 to the third transmission shaft 67. A transmission gear 69 is fixed to the third transmission shaft 67. A first bevel gear 70 is fixed to the third transmission shaft 67.

  On the lower transmission side of the third transmission shaft 67, a pair of front transmission shafts 71 are arranged in contact with each other in parallel with the third transmission shaft 67. A differential mechanism 72 is provided between the pair of front transmission shafts 71. A differential case 72 a of the differential mechanism 72 is rotatably supported inside the mission case M. A transmission gear 69 fixed to the third transmission shaft 67 is meshed with a driven gear 72b fixed to the differential case 72a.

  A differential lock body 72c is externally fitted to one front transmission shaft 71 of the pair of front transmission shafts 71 so as to be integrally rotatable and slidable by a key structure. The differential lock body 72c can be switched between a differential enabled state (diff lock released state) released from the differential case 72a and a differential disabled state (diff locked state) engaged with the differential case 72a. It is configured.

  As shown in FIGS. 8 and 11, a traveling output shaft 74 that protrudes rearward from the rear end of the mission case M is provided at the rear of the mission case M. The travel output shaft 74 is provided with a second bevel gear 75. The second bevel gear 75 is meshed with the first bevel gear 70 fixed to the third transmission shaft 67, whereby power is transmitted from the third transmission shaft 67 to the travel output shaft 74.

  A rear axle case 60R that supports the pair of left and right rear wheels 12 is provided, and a rear transmission shaft 77 is interlocked and linked between the travel output shaft 74 and the rear transmission shaft 76 of the rear axle case 60R. . The power transmitted to the rear transmission shaft 76 is transmitted to the left and right rear wheels 12 via the side clutch 73, respectively.

  As a result, the power of the engine E causes the transmission output shaft 61b, the first transmission shaft 63, the second transmission shaft 65, the third transmission shaft 67, the differential mechanism 72, and the front transmission shaft 71 of the hydrostatic continuously variable transmission 61 to be transmitted. To the pair of left and right front wheels 11, and to the pair of left and right rear wheels 12 via the differential case 72 a of the differential mechanism 72, the travel output shaft 74, and the rear transmission shaft 76.

〔sleeve〕
Here, as shown in FIG. 11, an oil seal 78 is disposed on the travel output shaft 74 at the rear end of the transmission case M. The travel output shaft 74 is fitted with a wear-resistant sleeve 79. The sleeve 79 is disposed so that the outer peripheral surface of the sleeve 79 is in contact with the inner peripheral surface of the oil seal 78. By arranging such a sleeve 79, wear of the oil seal 78 due to rotation of the travel output shaft 74 can be prevented, oil leakage from the rear end of the transmission case M, It is possible to effectively prevent soil and mud from entering the mission case M from the rear end.

Next, the planting transmission structure will be described.
[Transplant structure of planting system]
As shown in FIGS. 9 and 10, a fourth transmission shaft 80 parallel to the second transmission shaft 65 is supported and provided in the transmission case M on the lower transmission side of the second transmission shaft 65. A work output gear 81 is fixed to the second transmission shaft 65. The power of the second transmission shaft 65 is configured to be transmitted from the work output gear 81 to the fourth transmission shaft 80 via the torque limiter T.

  The fourth transmission shaft 80 is provided with a planting shift gear 84 that rotates integrally with the fourth transmission shaft 80 and is slidable with respect to the fourth transmission shaft 80 by a spline structure. Yes. The planting shift gear 84 is integrally provided with a first planting low speed gear 84a and a first planting high speed gear 84b having a smaller diameter than the first planting low speed gear 84a.

  The first transmission shaft 63 includes a first loose-fitting gear 85a, a second loose-fitting gear 85b, a third loose-fitting gear 85c, a fourth loose-fitting gear 85d, and a fifth loose-fitting gear 85e. On the other hand, it is supported so as to be relatively rotatable. The first loose-fitting gear 85a, the second loose-fitting gear 85b, the third loose-fitting gear 85c, the fourth loose-fitting gear 85d, and the fifth loose-fitting gear 85e are fixed to each other so as to rotate together. The diameters of the gears are set such that the first loose-fit gear 85a, the second loose-fit gear 85b, the third loose-fit gear 85c, the fourth loose-fit gear 85d, and the fifth loose-fit gear 85e increase in order. .

  The planting shift gear 84 is engaged with the first planting low-speed gear 84a and the first loose-fitting gear 85a and the first planting high-speed gear 84b by sliding the second speed change operation rod 27. And meshing with the fifth loose-fitting gear 85e can be selected. Thus, the power transmitted from the planting shift gear 84 to the lower transmission side can be shifted in two steps. As described above, the planting shift gear 84, the second speed change operating rod 27, the first loosely fitting gear 85a, the fifth loosely fitting gear 85e, and the like constitute the second speed change mechanism S2 disposed in the transmission case M. Yes. In other words, the second speed change mechanism S2 shifts the power from the engine E to two stages (an example of “multiple stages”), whereby the seedling as “ground work” by the seedling planting device 16 which is the “work apparatus”. The planting interval (between stocks) is changed in two stages.

  A fifth transmission shaft 86 parallel to the first transmission shaft 63 is supported in the transmission case M on the lower transmission side of the fourth transmission shaft 80 and the first transmission shaft 63. The fifth transmission shaft 86 is provided with a first transmission gear 87a, a second transmission gear 87b, a third transmission gear 87c, and a fourth transmission gear 87d that are supported in a relatively rotatable manner. The diameters of the gears are such that the first transmission gear 87a, the second transmission gear 87b, the third transmission gear 87c, and the fourth transmission gear 87d become smaller in this order. The first transmission gear 87a is always meshed with the first loose fitting gear 85a, the second transmission gear 87b is always meshed with the second loose fitting gear 85b, and the third transmission gear 87c is meshed with the third loose fitting gear 85c. The fourth transmission gear 87d is always meshed with the fourth loosely engaging gear 85d. A third bevel gear 88 is fixed to the fifth transmission shaft 86.

  The fifth transmission shaft 86 is provided by a large-diameter cam portion 26b provided on one end side of the first transmission operation rod 26 by sliding the first transmission operation rod 26 inserted in the center of the fifth transmission shaft 86 in the axial direction. The transmission ball 87e engaged with and supported by is pushed outward in the radial direction and displaced. By engaging the transmission ball 87e with the central hole of any one of the first transmission gear 87a, the second transmission gear 87b, the third transmission gear 87c, and the fourth transmission gear 87d, Only one of them is selected to engage and transmit power, and the power transmitted to the driven fifth transmission shaft 86 can be shifted in four stages. As described above, the first transmission gear 87a, the second transmission gear 87b, the third transmission gear 87c, the fourth transmission gear 87d, the first transmission operation rod 26, the transmission ball 87e, and the like are arranged in the transmission case M. A single transmission mechanism S1 is configured. In other words, the first speed change mechanism S1 shifts the power from the engine E to four stages (an example of “multiple stages”), whereby the seedling as “ground work” by the seedling planting device 16 which is the “work apparatus”. Change the planting interval (between stocks) in four stages.

  In this way, the power of the planting system is changed to a total of eight speeds by combining the four speeds by the operation of the first speed change operation rod 26 and the two speeds by the operation of the second speed change operation rod 27. It is configured to be able to do.

  On the rear side of the mission case M, a cylindrical body 90 supported so as to be rotatable relative to the mission case M is provided. The cylindrical body 90 is provided with a fourth bevel gear 91. The fourth bevel gear 91 is meshed with a third bevel gear 88 fixed to the fifth transmission shaft 86.

  At the rear part of the mission case M, a planting output shaft 92 that protrudes rearward from the rear end part of the mission case M and that is concentrically with the cylindrical body 90 and is located inside the cylindrical body 90 is provided. A planting clutch 93 that rotates integrally with the planting output shaft 92 and is slidable with respect to the planting output shaft 92 is externally fitted to the planting output shaft 92 by a spline structure. . The planting clutch 93 can be switched between an engagement state in which the planting clutch 93 is engaged and a disengagement state in which the planting clutch 93 is not engaged with the cylinder 90. When the planting clutch 93 is engaged, the power of the fifth transmission shaft 86 is transmitted to the planting output shaft 92 via the third bevel gear 88, the fourth bevel gear 91, the cylindrical body 90, and the planting clutch 93. Communicated. On the other hand, when the planting clutch 93 is disengaged, power transmission from the fifth transmission shaft 86 to the planting output shaft 92 can be cut off. The planting clutch 93 is biased toward the engaged state, and is configured to switch between the engaged state and the disengaged state by withdrawing and retracting the operation shaft 94.

〔bush〕
Here, as shown in FIG. 10, a bush 95 is fitted on the operation shaft 94. The operation shaft 94 is suitably positioned with respect to the transmission case M by the bush 95. Further, the bush 95 prevents the outer peripheral surface of the operation shaft 94 from sliding directly on the transmission case M, so that the durability of the operation shaft 94 can be improved.

  As shown in FIG. 9, the power of the planting output shaft 92 is transmitted to the input shaft 98 of the feed case 97 via the rotation transmission shaft 96. By the power input to the input shaft 98, the seedling placing table 17 is reciprocated in conjunction with the seedling planting mechanism 18 and the seedling planting operation by the seedling planting mechanism 18. As a result, seedlings are planted on the farm surface at the planting speed shifted by the first transmission mechanism S1 and the second transmission mechanism S2 corresponding to the traveling speed of the traveling machine body 13. Thereby, rice planting can be performed at a desired planting interval (between plants) by operating the first transmission mechanism S1 and the second transmission mechanism S2.

[Another embodiment]
(1) In the above-described embodiment, the “transmission lever” is supported so as to be rotatable about the first transmission lever 28 and the second vertical axis X2 that are rotatably supported around the first vertical axis X1. The second shift lever 29 is shown as an example, but is not limited thereto. For example, it may be a first speed change lever or a second speed change lever supported around the horizontal axis or the front and rear axis.

  (2) In the above embodiment, as the “speed change operation rod”, the first speed change operation rod 26 and the second speed change operation rod 27 protruding outward from the lateral side surface of the transmission case M are shown as an example. Not limited to. For example, the first speed change operation rod and the second speed change operation rod that protrude outward from the front surface or the rear surface of the mission case M may be used.

  (3) In the said embodiment, although the 1st arm member 37 made into the U shape which makes the front side of a body the convex part was shown as an example, it is not restricted to this. For example, the first arm member may be formed in a U-shape having a convex portion on the other side such as the rear side of the fuselage, the lateral side of the fuselage, and the lateral side of the fuselage.

  (4) In the above embodiment, the riding type rice transplanter is shown as an example of the “paddy field machine”, but is not limited thereto. For example, other paddy field machines such as a walking type rice transplanter, a riding type direct seeder, and a walking type direct seeder may be used. In the case of a direct sowing machine, a sowing apparatus for directly sowing seeds in a field corresponds to a “working apparatus”.

16: Seedling planting device (working device)
25: Airframe frame 26: First speed change operation rod (speed change operation rod)
27: Second speed change rod (speed change rod)
28: First shift lever (shift lever)
29: Second shift lever (shift lever)
30: First support member (support member)
50: Second support member (support member)
E: Engine M: Mission case S1: First transmission mechanism (transmission mechanism)
S2: Second transmission mechanism (transmission mechanism)
X1: First vertical axis (vertical axis)
X2: Second vertical axis (vertical axis)

Claims (3)

An engine,
The fuselage frame,
A mission case fixed to the aircraft frame;
A working device that performs ground work;
A speed change mechanism that is arranged in the transmission case and changes the interval of ground work by the work device by shifting the power from the engine in multiple stages;
A speed change operation rod that protrudes outward from the transmission case to change speed of the speed change mechanism;
A shift lever interlocked with the shift operation rod, and
A paddy field machine in which the transmission lever is supported by the transmission case. A support member fixed to the mission case is provided,
The paddy field work machine according to claim 1, wherein the shift lever is supported by the support member so as to be rotatable about a vertical axis. The speed change operation rod protrudes outward from the lateral side surface of the mission case,
The paddy field work machine according to claim 1 or 2, wherein the shifting mechanism is configured to perform a shifting operation by a sliding movement of the shifting operation rod in a lateral direction of the machine body.

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