JP5166362B2 - Rice transplanter - Google Patents

Description

  The present invention relates to a rice transplanter that includes a seedling stage and a seedling planting claw and performs seedling planting work continuously.

  A conventional rice transplanter includes a traveling vehicle on which an engine and a transmission case are mounted, and a planting portion installed on the traveling vehicle via a link mechanism, and supports a front wheel on a front axle case at the front of the traveling vehicle. The rear wheels are supported by the rear axle case at the rear of the traveling vehicle. As the arrangement of the fuel tank in the rice transplanter, a structure (Patent Document 1 etc.) arranged below the step of the driver's seat and a structure (Patent Document 2 etc.) arranged in a front box provided with a steering shaft are known. is there.

JP 2000-31513 A JP 2001-54305 A

  For example, in the conventional structure in which the fuel tank is arranged below the step, the fuel tank cannot be enlarged while maintaining the ground height of the airframe at a predetermined height. Moreover, in the conventional structure which arrange | positions a fuel tank in a front box, it is necessary to form a front box large by the enlargement of a fuel tank. In addition, there is a problem that the weight balance of the traveling vehicle is not maintained due to increase / decrease of fuel in the fuel tank or raising / lowering of the planting part.

  The present invention solves the above-mentioned problem, and can make the airframe composed of a transmission case, a front axle case, and a rear axle case with high rigidity, while utilizing a dead space of the airframe or It is an object of the present invention to provide a rice transplanter in which accessory parts such as a lifting cylinder can be incorporated and the accessory parts can be assembled compactly.

In order to solve the above problems, the inventions of claim 1, the engine (2) and transmission case (4) traveling vehicle equipped with a (1), the link mechanism to the vehicle (1) (26) A front axle case (5) on the front part of the traveling vehicle (1), and a front wheel (6) supported by a front axle case (5) mounted on the front of the traveling vehicle (1). In a rice transplanter in which a rear wheel (8) is supported on a rear axle case (7), the transmission case (4) and the rear axle case (7) are connected by a connecting frame (70), and the connecting frame (70) of between the driver's seat located above the (13) and the connecting frame (70), wherein the planting unit (15) a structure in which the lifting Cylinders (27) for lifting, said in a side view The elevating cylinder (27) is connected to the connecting frame (70). So that the base end side of the elevating cylinder (27) can be turned up and down on a mounting seat (79) projecting from the upper surface of the connecting frame (70) by a fulcrum shaft that is laterally directed to the left and right. It is connected .

According to a second aspect of the present invention, in the rice transplanter according to the first aspect, left and right rising portions (50) are provided on a body frame (3) of the traveling vehicle (1), and the rear axle case (7) is provided. the rear end is connected to the rising portion of the right and left erected the portal frame (53) (50), the rising portion of the left and right of the driver's seat above the (50) (13) provided in the operation is that is disposed the fuel tank (46) during the rising portion of and the right and left below the seat (13) (50).

According to the present invention, since the transmission case and the rear axle case are connected by the connecting frame, the airframe composed of the transmission case, the front axle case, and the rear axle case can be made highly rigid. Also, because by placing the lifting cylinder da between the coupling frame and the driver's seat, the connecting frame upper extra space can effectively utilized, it can be incorporated into the aircraft the lift Cylinders compact. The lifting cylinder da, can be arranged in good balance in surrounded by the connecting frame and the driver's seat position.

Whole side view of rice transplanter. Overall plan view of rice transplanter. The side view of a traveling vehicle body. The top view of a traveling vehicle body. The side view of a vehicle body frame. Side surface explanatory drawing of a drive part. Plane explanatory drawing of a drive part. Side surface explanatory drawing of a side clutch operation system. Plane explanatory drawing of a side clutch operation system. FIG. FIG. FIG. FIG. The perspective explanatory drawing of a raising / lowering link part. Explanatory drawing of a raising / lowering link attaching part. The fuel tank installation side view. The fuel tank installation top view. Cross-sectional explanatory drawing of a mission case. Front explanatory drawing of a mission case. Explanatory drawing of a planetary reduction gear mechanism part. Explanatory drawing of a driving | running | working output shaft part. Cross-sectional explanation of the rear axle case part. Plane explanatory drawing of a cam member part. Front explanatory drawing of a cam member part.

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a side view of the whole, FIG. 2 is a plan view of the same, FIG. 3 is a side view of a vehicle body frame, FIG. 4 is a plan view of the vehicle body, and 1 in FIG. Mounted on the vehicle body frame 3, the front wheel 6 for paddy field traveling is supported on the side of the transmission case 4 via the front axle case 5, and the rear wheel 8 for paddy field traveling is supported on the rear axle case 7 behind the transmission case 4. The spare seedling stage 10 is attached to both sides of the bonnet 9 that covers the engine 2 and the like, and the mission case 4 and the like are covered by a vehicle body cover 11 on which an operator rides. A driver's seat 13 is attached, and a steering handle 14 is provided at the rear of the bonnet 9 in front of the driver's seat 13.

  In the figure, reference numeral 15 denotes a planting part having a seedling mounting table 16 for five-row planting and a plurality of seedling planting claws 17. The planting case 20 is supported by the planting case 20 through the lower rail 18 and the guide rail 19 so as to be slidable in the left and right directions, and a rotary case 21 that rotates at a constant speed in one direction is supported by the planting case 20. A pair of nail cases 22 and 22 are arranged at symmetrical positions around the axis, and seedling planting nails 17 and 17 are attached to the tips of the nail cases 22 and 22.

  Further, the hitch bracket 23 on the front side of the planting case 20 is connected to the rear side of the traveling vehicle 1 through an elevating link mechanism 26 including a top link 24 and a lower link 25, and the planting unit 15 is moved up and down via the link mechanism 26. The hydraulic lifting cylinder 27 is connected to the lower link 25, and the front and rear wheels 6 and 8 are driven to move, and at the same time, the seedlings 16 are slid back and forth, and one seedling is planted by the planting claws 17. It is configured to take out and perform seedling planting work continuously.

  In the figure, 28 is a main transmission lever, 29 is a planting lift lever, 30 is a brake pedal, 31 is an accelerator pedal, 32 is a differential lock pedal, 33 is a sensitivity adjustment lever, and 34 is stopped at an arbitrary height position of the planting part 15. The stop lever 35 is a unit clutch lever 35. The main shift and elevating levers 28 and 29 and the brake and accelerator pedals 30 and 31 are disposed near the steering handle 14, and the sensitivity is adjusted near the driver seat 13. In addition, stop and unit clutch levers 33, 34, 35 and a differential lock pedal 32 are provided.

  Further, in the figure, 36 is a center float for leveling of one strip, 37 is a side float for leveling of two strips, 38 is a float 36 through the flexible conveying hose 41 by using the blowing force of the blower 40 for fertilizer in the fertilizer hopper 39. -It is a 5-way side strip fertilizer machine which makes it discharge to 37 side strip groover 42.

  As shown in FIGS. 3 to 5, the vehicle body frame 3 is divided into a front frame 43, an intermediate frame 44, and a rear frame 45. The engine 2 is placed in the front frame 43, and the front axle case 5 is placed in the intermediate frame 44. The rear frame 45 is provided with a rear axle case 7 and a fuel tank 46 for supplying fuel to the engine 2. The front frame 43 has a front frame 47 at the front ends of the left and right frames 43a and 43b, and a base frame 48 at the middle. They are connected to each other to form a quadrangular frame shape in plan view, and the engine 2 is mounted on the fixing bracket 49 and the base frame 48 of the left and right frames 43a and 43b via vibration-proof rubber.

  The rear frame 45 is a portal frame in which the middle rising portions 50 of the left and right frames 45a and 45b are connected in parallel by a pipe frame 51 and a portal frame 52, and the left and right lower ends are fixed to the rear axle case 7. 53, the rear ends of the left and right frames 45a and 45b are integrally connected, and the fuel tank 46 is arranged between the rising portions 50 of the left and right frames 45a and 45b.

  Further, the intermediate frame 44 is configured such that the front and rear ends of the left and right intermediate frames 44 are detachably fixed to the rear ends of the front left and right frames 43a and 43b and the front ends of the rear left and right frames 45a and 45b through bolts 54, and The left and right front axle cases 5 are detachably fixed to the lower surface of the intermediate frame 44 via bolts 55, and the left and right front axle cases 5 are connected and fixed to the transmission case 4.

  In addition, the front left and right frames 43a and 43b have a larger cross-sectional area than the rear left and right frames 45a and 45b, so that the front frame 43 on which the heavy engine 2 is mounted is made rigid. The intermediate frame 44 and the rear frame 45 that do not require strength as compared with the front frame 43 are formed to be light in weight so that the front-rear balance and the strength balance are good. Further, by assembling and integrating the engine 2, the front axle case 5, the transmission case 4, the rear axle case 7, etc. into the divided front frame 43, intermediate frame 44, and rear frame 45, respectively, Maintainability can be improved.

  Then, step frames 56, 57, and 58 project from the front and rear outer sides of the front frame 43 and the front and outer sides of the rear frame 45, and the outer sides of these frames 56, 57, and 58 are connected by a front pipe 59, The left and right rear pipes 62 are connected to the step frame 61 fixed between the upper sides of the rising parts 50 via the bracket 60 and the left and right outer sides of the frame 58, and the rear sides of the left and right rear pipes 62 are connected to each other by the horizontal frame 62a. The upper horizontal portion of the portal frame 53, the horizontal frame 62a, and the substantially central portion of the step frame 61 are connected by two frames 62b in the front-rear direction, and the footrest 63 is attached to the lower horizontal portion of the front side of the rear pipe 62. When the detachable bolt is fixed, and the driver's seat 13 is supported by the portal frame 52 and the step frame 61 via the seat frame 12. To constitute the top surface of each frame 56, 57, 58, 61 so as to freely fix hold removed body cover 11.

  As shown in FIGS. 6 to 13, the transmission case 4 has a power steering case 64 on the left side of the front surface and a hydraulic continuously variable transmission mechanism (HST) 65 on the right side. 66 is protruded in the front direction of the vehicle body, the input shaft 66 is connected to the counter shaft 67 in the front-rear direction at the lower side of the engine 2, and the counter shaft 67 is connected to the engine output shaft 68 via the transmission belt 69. Is transmitted to the transmission case 4 via the continuously variable transmission mechanism 65.

  Further, the transmission case 4 and the rear axle case 7 are integrally connected by a connecting frame 70 made of pipe on the center line of the vehicle body, and the rear traveling output shaft 71 and the PTO output shaft 72 are projected behind the transmission case 4 so that the rear axle case is 7. The output shaft 71 is connected to the input shaft 73 protruding forward through the transmission shaft 74, and the PTO output shaft 72 is connected to the intermediate shaft 76 provided on the bearing 75 at the upper part of the rear axle case 7 through the universal joint shaft 77. The intermediate shaft 76 is connected to the input shaft of the planting case 20 via a universal joint shaft 78.

  The connecting frame 70 is connected to the front and rear axle cases 5 and 7, a cylinder mounting seat 79 is fixed on the upper surface of the rear portion of the connecting frame 70, and the base end of the elevating cylinder 27 is mounted on the mounting seat on the center line of the vehicle body. 79 is configured to be supported. The inside of the connecting frame 70 may be used as a hydraulic oil tank such as the elevating cylinder 27, and the connecting frame 70 is connected to the front and axle cases 5 and 7 so that the inside of the cases 5 and 7 and the connecting frame 70 are connected. May be used in an oil tank.

  As shown in FIGS. 14 and 15, the rear axle case 7 is formed in a gate shape in a plan view, and rope hooks 81 are fixed to the outer surfaces of the left and right gear case portions 80 on both sides of the case 7 and are formed between the left and right gear case portions 80. The lower link 25 is disposed in the portal space 82, and the link bearing member 84 is fixed to the central upper surface of the axle case 7 via a bolt 83 which is a fixing means. 85, the front end side of the lower link 25 is connected, the tip of the piston rod 86 of the elevating cylinder 27 is connected to a pivot plate 25a fixed to the lower link 25, and the lower link 25 is connected to the hitch bracket 23 via the rear fulcrum shaft 88. The rear end side is connected and the planting part 15 is lifted and lowered by the top link 24 that connects the gate frame 53 and the hitch bracket 23. It is configured to perform.

  The lower link 25 is formed of a square pipe, and fulcrum cylinder shafts 89 and 90 to which the front and rear fulcrum shafts 85 and 88 are fitted are provided on the front and rear end sides of the lower link 25, thereby reducing the weight of the parts and rigidity against rolling. It is configured to improve.

  As shown in FIGS. 16 and 17, the fuel tank 46 is disposed in a surplus space between the rising portions 50 of the rear left and right frames 45 a and 45 b below the driver's seat 13. The front end of the tank 46 is fixed detachably via a bolt 92, and the left and right protruding edges 46 a in the middle of the tank 46 are connected via a bolt 95 to a tank mounting plate 94 fixed to the lower side of the step frame 61 via a bolt 93. The tank 46 is disposed in a well-balanced manner in a dead space surrounded by the driver's seat 13, the connecting frame 70, and the left and right frames 45a and 45b on the vehicle body center line in the rising portion 11a on the rear side of the vehicle body cover 11. It is configured to do.

  As shown in FIGS. 8 and 9, the power steering case 64 has a torque generator 96 on the upper side and a planetary reduction gear mechanism 97 on the lower side, and is provided in a vertically long shape. The width is made small and a compact arrangement is possible, so that the narrow tread of the left and right front wheels 6 can be handled well.

  The cam member 101 for operating the left and right side clutches in the rear axle case 7 is connected to the steering arm 98 below the power steering case 64 via the first and second rods 99, 100. The vertical swing arms 103 and 104 are fixed to the vertical projecting ends of the vertical axis 102 penetrating in the direction, and the first rod 99 and the upper swing arm are pivoted between the steering arm 98 and the lower swing arm 104 at a position on the right side of the connecting frame 70. The movable arm 103 and the cam member 101 are connected by the second rod 100 so that the left and right side clutch on / off operation linked to the operation of the steering handle 14 is performed.

  As is clear from the above, the vehicle body frame 3 constituting the airframe is divided into three parts, a front frame 43, an intermediate frame 44, and a rear frame 45. , Handling and assembly can be improved.

  Further, the front axle case 5 is connected to the intermediate frame 44, and the engine 2 and the like are connected to the front frame 43, and the transmission case 4 and the front axle case 5 are integrally attached and detached. Therefore, the maintenance of the transmission case 4 and the front axle case 5 can be improved.

  Further, the cross-sectional area of the front frame 43 is formed larger than that of the rear frame 45, and the engine 2 is supported by the front frame 43. The heavy engine 2 is supported by the front frame 43 with good strength. The stability of the aircraft can be improved by improving the front-rear balance with the planting portion 15 to be equipped on the rear side of the aircraft.

  In addition, a connecting frame 70 for integrally connecting the mission case 4 on the front side of the fuselage and the rear axle case 7 on the rear side of the fuselage is provided, and a planting lifting cylinder 27 for lifting the planting part 15 is attached to the coupling frame 70. Cylinder load is prevented from being applied to the body frame 3, and the body frame 3 can be easily and easily reduced in weight, and the cylinder load is supported by the front and rear wheels 6 and 8 through the connecting frame 70 and lifted up and down. The mounting strength of the cylinder 27 can be improved, and the heavy lifting cylinder 27 can be easily mounted.

  Further, a mounting seat 79 for the planting elevating cylinder 27 is provided on the upper surface of the connecting frame 70, and the elevating cylinder 27 is supported on the connecting frame 70 with good strength. Can be protected without damage, and the performance of the cylinder 27 can be stably maintained.

  Further, the transmission case 4 and the rear axle case 7 are connected to each other via the rear frame 45 above the connection frame 70, and the transmission case 4, the rear axle case 7, the connection frame 70, and the rear frame 45 (including the gate-shaped frame 53). Thus, it is possible to easily reduce the weight and rigidity of the machine frame structure formed by the transmission case 4, the rear axle case 7, the connecting frame 70, and the rear frame 45.

  Further, a fuel tank 46 is disposed in the vehicle body cover 11 from the cover rising portion 11a on the rear side of the vehicle body cover 11 as a step to the lower side of the driver's seat 13, and the dead space below the driver's seat 13 is effectively used. The large-capacity fuel tank 46 can be easily installed, the vapor lock phenomenon of the fuel is prevented to improve the heat balance, and the fuel tank 46 is arranged at a substantially central position of the airframe to increase or decrease the fuel. The stability of the fuselage can be improved by preventing the deterioration of the front and rear and left / right balance.

  Further, the planting lift cylinder 27 and the driver's seat 13 that lift and lower the planting portion 15 with respect to the fuel tank 46 are vertically wrapped in a side view, and the driver seat 13, the lift cylinder 27, and the fuel tank 46 are It is possible to easily incorporate a compact aircraft with a small front-rear length, and to reduce the size of the aircraft.

  Further, a fuel tank 46 is disposed above a connecting frame 70 that integrally connects the mission case 4 on the front side of the aircraft and the rear axle case 7 on the rear side of the aircraft. It is possible to protect the tank 46 and prevent damage to the fuel tank 46.

  Further, in the rice transplanter in which the planting part 15 is supported on the machine side via the lifting link mechanism 26 so as to be lifted and lowered, a link bearing member 84 which is a machine side mounting part of the lower link 25 constituting the lifting link mechanism 26 is provided. It is provided on the rear axle case 7, and the load of the planting part 15 applied to the lower link 25 when planting is raised is favorably supported by the solid rear axle frame 7 to improve the support strength of the planting part 15, Compared with the conventional structure in which the lower frame 25 is supported on the vehicle body frame 3, the weight of the vehicle body frame 3 can be easily reduced, and the lower link 25 can be easily removed and attached to maintain the lower link 25. Can be improved.

  Further, a cylindrical shaft 89 that is a lower link fulcrum portion is integrally formed on the lower link 25, and a lower link fulcrum cylindrical shaft 89 on the front side of the lower link 25 is rotatably supported on the rear axle case 7 via an attachment portion 84. Therefore, the lower link 25 can be favorably supported on the rear axle case 7 with a simple structure with a reduced number of parts, and the planting portion 15 can be reliably held.

  Further, the rear axle case 7 is formed in a gate shape in plan view, and a lower link fulcrum cylinder shaft 89 is arranged in the portal space portion 82 of the rear axle case 7, and the lower link fulcrum cylinder shaft 89 is formed on the rear wheel 8 axles. The machine body and the planting part 15 can be brought close to the maximum so that the total length of the rice transplanter body can be easily reduced, and the machine body can be reduced in size.

  Further, the lower link 25 is formed of a single pipe member, and front and rear lower link fulcrum cylinder shafts 89 and 90 of the lower link 25 are provided at the front and rear ends of the pipe member. Therefore, the connecting structure of the lower link 25 can be simplified, and the weight of the lower link 25 can be reduced to easily reduce the size and weight of the fuselage.

  As shown in FIGS. 18 to 21, the transmission input shaft 66 and the output shaft 105 of the transmission mechanism 65 are provided in two stages on the same line in the front-rear direction, and the input shaft 66 that projects forward of the transmission mechanism 65 is the counter shaft. An output shaft 105 that is connected to 67 and protrudes rearward of the speed change mechanism 65 is connected to the mission input shaft 107 in the mission case 4 via the planetary reduction gear mechanism 106. The gear mechanism 106 is connected to a transmission output shaft 105, an internal gear 110 connected to the sun gear 108 through a planetary gear 109, a carrier gear 111 that supports the planetary gear 109, and a transmission input shaft 66. 111 has a carrier rotation gear 112 to be coupled, and is configured to connect the internal gear 110 to the mission input shaft 107 and transmit the deceleration output from the planetary reduction gear mechanism 106 to the mission input shaft 107. .

  A transmission input shaft 66 is connected to a pump shaft 114 of a hydraulic pump 113 that penetrates the transmission case 4 in the front-rear direction, and a fertilizer application PTO output for the rear travel output shaft 71, the PTO output shaft 72, and the fertilizer applicator 38. The mission input shaft 107 is connected to the shaft 115 via each gear mechanism 116, and the rear running output shaft 71 is connected to the mission input shaft 107 via the counter shaft 117 to perform forward running, and to the mission input shaft 107. The rear traveling output shaft 71 is directly connected to perform backward traveling.

  Further, the front travel output shaft 119 is connected to the rear travel output shaft 71 via a pair of gears 118, and the left and right wheel shafts 122 of the front wheels 6 are connected to the front travel output shaft 119 via a pair of reduction bevel gears 120 and a differential mechanism 121. The front wheel 6 is connected to drive the counter wheel 117, the PTO output shaft 72 is connected to the counter shaft 117 via the inter-shaft transmission shaft 123, and the inter-shaft transmission shaft 123 is connected to the fertilizer PTO output shaft 115 via the transmission chain 124. The PTO output shafts 72 and 115 are driven.

  As described above, the engine 2, the continuously variable transmission mechanism 65, the planetary reduction gear mechanism 106, and the transmission gear mechanism 116 of the transmission case 4 are sequentially arranged in a vertical line in the front-rear direction, and the drive output system of this engine output is arranged. In addition to simplification, the variable speed input / output shafts 66 and 105, the front and rear output shafts 71 and 119, and the PTO output shafts 72 and 115 of the continuously variable transmission mechanism 65 are arranged in the front-rear direction of the fuselage to reduce the use of bevel gears. Thus, the structure of the gear mechanism 116 is simplified, and the transmission case 4 is configured to be light and small.

  As shown in FIG. 6, the continuously variable transmission mechanism 65 is disposed in the vicinity of the engine intake port 125 for taking in cooling air on the rear side of the engine 2 and enhances the cooling effect by the flow of cooling air around the transmission mechanism 65. Thus, the transmission mechanism 65 is configured to stably maintain the performance.

  As apparent from the above, in the rice transplanter provided with the hydraulic continuously variable transmission mechanism 65 for continuously changing the engine driving force, the input shaft 66 and the output shaft 105 of the continuously variable transmission mechanism 65 are provided in the longitudinal direction of the machine body. The transmission output shaft 71 and the PTO output shaft 2 of the mission case are arranged in the longitudinal direction of the machine body, and the input / output shafts 66 and 105 of the continuously variable transmission mechanism 65 and the directions of the traveling and PTO output shafts 71 and 72 coincide. Thus, it is possible to easily simplify these drive structures by performing simple connection with less use of a bevel gear or the like.

  In addition, the input shaft 66 and the output shaft 105 of the continuously variable transmission mechanism 65 are arranged up and down, and the left and right width of the continuously variable transmission mechanism 65 is reduced, and the surplus space near the continuously variable transmission mechanism 65 is increased. For example, the compact body of the continuously variable transmission mechanism 65 that can easily incorporate other components such as the steering device 64 can be implemented.

  Further, a power steering case 64 as a steering device is provided on one side of the left and right of the continuously variable transmission mechanism 65. For example, the left and right widths of the continuously variable transmission mechanism 65 and the power steering case 64 are provided at predetermined locations such as the front surface of the transmission case 4. Therefore, the continuously variable transmission mechanism 65 and the steering device 64 can be easily assembled into a compact body.

  Further, the continuously variable transmission mechanism 65 is provided at the engine intake port 125 on the intake side of the engine 2, and the continuously variable transmission mechanism 65 is effectively cooled by the intake action of the engine 2, so that the continuously variable transmission mechanism 65 is cooled. Stable performance can be maintained.

  Further, the drive system is arranged in the order of the continuously variable transmission mechanism 65, the planetary reduction gear mechanism 106, and the transmission gear mechanism 116 on the rear side of the engine 2, so that the transmission system of the engine driving force is simplified, and the fuselage Can be easily reduced in size and weight.

  As shown in FIGS. 7, 13, and 14, the front axle case 4 and the rear axle case 7 and the front and rear ends of the connection frame 70 are fixed with bolts for dimensional stable mounting, and the universal joint Compared to a structure in which the bearing 75 of the intermediate shaft 66 connected to the shaft 77 and the link bearing member 84 of the lower link 25 are attached to the rear axle case 7 with good strength and are attached to the conventional vehicle body frame 3, It is configured to reduce weight.

  Further, the universal joint shaft 77 and the yokes 126 at both ends are integrally formed so as to reduce the number of parts and the number of assembling steps and facilitate the assembly.

  As shown in FIGS. 22 to 24, the rear axle case 7 has an input shaft 73 connected to a rearward drive shaft 128 in the left-right direction via a pair of bevel gears 127, and left and right side clutch shafts via left and right side clutches 129 and 130. A rear drive shaft 128 is connected to 131, a left and right side clutch shaft 131 is connected to the left and right reduction shaft 132 via a pair of reduction gears 133, and a left and right side axle 134 of the left and right rear wheels 8 is connected to a left and right side reduction shaft 135. The speed reduction shaft 132 is connected to each other, and the driving force from the input shaft 73 is transmitted to the left and right rear wheels 8 via the left and right side clutches 129 and 130 to synchronize the left and right rear wheels 8 and to drive the rear of either the left or right. The wheel 8 is configured to be driven.

  Also, left and right clutch operating members 136 that are slidably supported on the rear driving drive shaft 128 and that turn on and off the left and right side clutches 129 and 130 are provided, and left and right arm shafts that join the lower end cam portion 137 to the operating member 136. The upper end of the rear axle case 7 protrudes outward from the upper surface of the rear axle case 7 and the base end of the left and right operation arm 140 having a roller 139 at the distal end is fixed to the upper end of the left and right arm shaft 138, while the fulcrum shaft on the upper surface of the rear axle case 7 A roller operation cam 142 that contacts the roller 139 is formed on the left and right ends of the cam member 101 that is horizontally swingably mounted on the 141. When the steering handle 14 is turned over a certain steering angle, the left and right operation arms 140, the operation cam 142 of the cam member 101 is brought into contact with the roller 139, and the operation arm 140 is rotated. Thus by the arm shaft 138 the lower end of the cam portion 137 is brought into contact with the clutch operating member 136, is a switching to one of the left and right side clutch 129 or 130 are configured to swirl fuselage switching side.

  Further, the operation cams 142 on both the left and right sides of the cam member 101 are formed in an arcuate surface with the fulcrum shaft 141 as the center, and the cam member 101 horizontally rotates around the fulcrum shaft 141 so that the operation cam 142 and the roller 139 are in contact with each other. Thereafter, the operation arm 140 is kept at a constant rotation position, and the disengagement operation amount of the side clutches 129 and 130 is kept constant.

  As is clear from the above, in the rice transplanter that interlocks the steering handle 14 that is the steering operation unit and the left and right side clutches 129 and 130, the clutch operating force from the steering handle 14 is controlled by the cam and roller mechanism. It is transmitted to the side clutches 129 and 130 via the cam 142 and the roller 139, and does not require a separate regulating member and ensures a certain amount of clutch operation that is not related to the amount of operation of the steering handle. The turning performance of the airframe can be improved by turning on and off the side clutches 129 and 130.

  Further, the arm shaft 138 which is a fulcrum shaft of the clutch operation arm 140 having the roller 139 and the fulcrum shaft 141 of the operation cam 142 are provided in the rear axle case 7, and the accuracy between the shaft centers of the operation arm 140 and the operation cam 142 is improved. The accuracy in the side clutch operation can be improved.

  By the way, conventionally, since the input / output shaft of a continuously variable transmission that performs shifting of traveling output or the like is arranged in the left-right direction of the fuselage, the output shaft in the front-rear direction of the transmission case has no bevel gear. The drive transmission structure between the continuously variable transmission mechanism and the transmission case has become complicated due to the necessity to connect the output shaft of the step transmission.

  As described above, in the rice transplanter provided with the hydraulic continuously variable transmission mechanism 65 for continuously changing the engine driving force, the input shaft 66 and the output shaft 105 of the continuously variable transmission mechanism 65 are provided in the longitudinal direction of the machine body, and the transmission case. Since the traveling output shaft 71 and the PTO output shaft 2 are arranged in the longitudinal direction of the machine body, the input / output shafts 66 and 105 of the continuously variable transmission mechanism 65 and the traveling and PTO output shafts 71 and 72 are aligned with each other. Thus, the drive structure can be easily simplified by performing simple connection with less use of a bevel gear or the like.

  In addition, since the input shaft 66 and the output shaft 105 of the continuously variable transmission mechanism 65 are arranged vertically, the left and right width of the continuously variable transmission mechanism 65 is reduced, and the excess space in the vicinity of the continuously variable transmission mechanism 65 is made effective. Thus, for example, it is possible to incorporate a continuously variable transmission mechanism 65 in a compact body that can easily incorporate other components such as the steering device 64.

  Further, since the steering device 64 is arranged on the left and right sides of the continuously variable transmission mechanism 65, the left and right widths of the continuously variable transmission mechanism 65 and the steering device 64 are reduced to a predetermined location such as the front surface of the transmission case 4, for example. A compact installation is possible, and the continuously variable transmission mechanism 65 and the steering device 64 can be easily incorporated into a compact body.

  Furthermore, since the continuously variable transmission mechanism 65 is disposed on the intake side 125 of the engine 2, the continuously variable transmission mechanism 65 is effectively cooled by the intake action of the engine 2, and the performance of the continuously variable transmission mechanism 65 is improved. Can be maintained stably.

  Further, since the drive systems are arranged in the order of the continuously variable transmission mechanism 65, the planetary reduction gear mechanism 106, and the transmission gear mechanism 116 on the rear side of the engine 2, the transmission system of the engine driving force is simplified. Therefore, it is possible to easily reduce the size and weight of the fuselage.

As is clear from the above embodiment, the vehicle 1 includes the traveling vehicle 1 on which the engine 2 and the transmission case 4 are mounted, and the planting portion 15 that is installed on the traveling vehicle 1 via a link mechanism 26. In the rice transplanter in which the front wheel 6 is supported by the front axle case 5 at the front and the rear wheel case 7 is supported by the rear axle case 7 at the rear of the traveling vehicle 1, the transmission case 4 and the rear axle case 7 are connected to the frame 70. And the elevating cylinder 27 or the fuel tank 46 is disposed between the connecting frame 70 and the driver's seat 13. Also, left and right rising portions 50 are provided on the vehicle body frame 3 of the traveling vehicle 1, and the rear end sides of the left and right rising portions 50 are connected to the rear axle case 7 via a gate-shaped frame 53. The driver's seat 13 is provided above, and the fuel tank 46 is disposed below the driver's seat 13 and between the left and right rising portions 50. Accordingly, since the elevating cylinder 27 or the fuel tank 46 is disposed between the connecting frame 70 and the driver's seat 13, the surplus space above the connecting frame 70 can be used effectively, and the elevating cylinder 27 or the fuel tank 46 can be compactly assembled. Can be built in. The elevating cylinder 27 or the fuel tank 46 can be arranged in a balanced manner at a position surrounded by the driver's seat 13, the vehicle body frame 3, and the connecting frame 70.

1 traveling vehicle 2 engine 4 transmission case 5 front axle case 6 front wheel 7 rear axle case 8 rear wheel 13 driver's seat 15 planting portion 26 lifting link mechanism 27 lifting cylinder 46 fuel tank 50 rising portion 52 portal frame 65 hydraulic stepless transmission Mechanism 70 connection frame

Claims (2)

A traveling vehicle (1) equipped with an engine (2) and a transmission case (4); and a planting portion (15) installed on the traveling vehicle (1) via a link mechanism (26). In a rice transplanter in which a front wheel case (5) is supported by a front axle case (5) at the front portion of a car (1) and a rear wheel case (8) is supported by a rear axle case (7) at the rear portion of the traveling vehicle (1). ,
The transmission case (4) and the rear axle case (7) are connected by a connecting frame (70) , and a driver seat (13) located above the connecting frame (70) and the connecting frame (70) are connected . during the planting unit (15) a structure in which the lifting Cylinders (27) for lifting,
A mounting seat (protruding) projecting the base end side of the elevating cylinder (27) on the upper surface of the connecting frame (70) so that the elevating cylinder (27) does not overlap the connecting frame (70) in a side view. 79) is connected to the left and right fulcrum shafts so as to be vertically rotatable.
Rice transplanter. Rising portions of the left and right in the vehicle body frame (3) and (50) provided in said vehicle (1), wherein the left and right rising portions to the rear axle erected case (7) has been portal frame (53) (50) The rear end side is connected, the driver seat (13) is provided above the left and right rising portions (50), and the fuel is provided below the driver seat (13) and between the left and right rising portions (50). A tank (46) is arranged ,
The rice transplanter according to claim 1.

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