JP2010035535A - Vehicle body height-adjusting structure of walking type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body height-adjusting structure of a walking type working machine, which can stably do works in a prescribed working depth in spite of a field having a shallow surface soil layer and a field having a deep surface soil layer without causing the increase in the size, weight and cost of a vehicle body. <P>SOLUTION: There is provided the vehicle body height-adjusting structure of the walking type working machine, which has a transmission case 5 upward or downward shaken on a lateral axis center P1 as a support point, and an operation mechanism E for upward or downward shaking the transmission case 5 on the axis center P1 as a support point within a preliminarily set shaking range, and in which a vehicle body height-adjusting mechanism F for changing the vehicle body height of a driving wheel 6 disposed in the free end portion of the transmission case 5 to adjust the ground height of the vehicle body comprises the transmission case 5 and the operation mechanism E, characterized by disposing a shaking range-changing means G capable of changing the setting of the shaking range in the vehicle body height-adjusting mechanism F. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a transmission case that swings up and down with a horizontally-oriented shaft center as a fulcrum, and an operation mechanism that swings up and down with the shaft center as a fulcrum within a preset swing range of the transmission case. And a vehicle body height adjusting mechanism that adjusts the vehicle ground height by changing the vehicle height of the propulsion wheel provided at the free end of the power transmission case from the transmission case and the operation mechanism. The present invention relates to a body height adjustment structure for a walking machine.

In the vehicle body height adjustment structure of the walking work machine as described above, there is one in which a hydraulic cylinder is installed between the vehicle body fixing portion side and the transmission case side, and the operating stroke of the hydraulic cylinder is set within the swing range of the transmission case. (For example, refer to Patent Document 1).
In addition, there is a type in which a screw feed mechanism is installed over the vehicle body fixing portion side and the transmission case side, and the screw feed range of the screw feed mechanism is set to the swing range of the transmission case (for example, see Patent Documents 2 and 3).
JP 9-168322 A JP-A-8-103117 Japanese Patent Laid-Open No. 5-292815

  According to the above configuration, the height of the vehicle body with respect to the field surface can be maintained constant by adjusting the height of the vehicle body to the ground according to the depth of the soil formation layer in the field. Work can be stably performed at a predetermined work depth regardless of fluctuations.

  By the way, there are various depths of the soil layer, especially in shallow fields with a general soil layer with irrigation equipment and deep soil fields with no irrigation equipment (for example, rainfed paddy fields). Layer depth varies greatly. Therefore, in the conventional vehicle body height adjustment structure described above, in order to enable the vehicle body height adjustment corresponding to those fields, a large hydraulic cylinder with a long operation stroke is adopted, or the screw feed amount is adjusted. It becomes necessary to make improvements such as adopting a long and long feed screw. If such improvements are made, it will lead to an increase in the size and weight of the vehicle body height adjustment mechanism and an increase in the cost required for the vehicle body height adjustment mechanism. As a result, the vehicle body will increase in size and weight. And cost increase.

  The object of the present invention is to stabilize the work at a predetermined work depth regardless of whether the field is shallow or the field is deep, without increasing the body size, weight and cost. It is to be able to do it.

In order to achieve the above object, in the invention according to claim 1 of the present invention,
A transmission case that swings up and down with a left-right axis as a fulcrum, and an operating mechanism that swings up and down with the shaft center as a fulcrum within a preset swing range of the transmission case;
From the transmission case and the operation mechanism, a vehicle body height adjusting mechanism for adjusting the height of the vehicle body to ground by changing the height of the propulsion wheel provided at the free end portion of the transmission case is configured. In the body height adjustment structure for walking work machines,
The vehicle body height adjusting mechanism is provided with a swing range changing means for enabling the setting change of the swing range.

  According to this characteristic configuration, when working in a general field with a shallow soil layer, the swing range changing means can be used to set the swing range in the vertical direction of the transmission case with the horizontal axis as a fulcrum. Therefore, the rocking range can be changed to be suitable for a field with a shallow soil layer. And by adjusting the ground height of the vehicle body within the swing range, the work can be stably performed at a predetermined work depth regardless of the fluctuation of the depth of the soil layer in the field where the soil layer is shallow. Can do.

  When working in fields such as rain-fed paddy fields where the soil is deep, the rocking range changing means can be used to set the rocking range in the vertical direction of the transmission case with the horizontal axis as a fulcrum. It can be changed to a rocking range suitable for deep farm fields. And by adjusting the ground height of the vehicle body within the swing range, the work can be stably performed at a predetermined work depth regardless of the fluctuation of the depth of the soil layer in the field where the soil layer is deep. Can do.

  In addition, by providing a swing range changing means, it is possible to implement soil without making improvements such as using a large hydraulic cylinder with a long operating stroke or a long feed screw with a long screw feed amount. This makes it possible to adjust the height of the vehicle body to the ground corresponding to the fields with greatly different layer depths.

  Therefore, it is possible to stably perform work at a predetermined working depth regardless of whether the field is shallow or deep, without increasing the body size, weight, and cost. Can do.

In the invention according to claim 2 of the present invention, in the invention according to claim 1,
A swing arm that swings integrally with the transmission case with the shaft center as a fulcrum is connected to the transmission case,
The operating mechanism is configured to perform the swing operation of the transmission case via the swing arm;
The swing range changing means changes the swing range by changing the connecting position of the swing arm with respect to the transmission case in the swing direction of the transmission case with the shaft as a fulcrum. It is configured.

  According to this characteristic configuration, it is possible to change the setting of the vertical swing range of the transmission case corresponding to the depth of the soil layer by a simple operation of changing the connecting position of the swing arm with respect to the transmission case.

  Therefore, it is possible to improve workability when changing the setting of the vertical swing range of the transmission case according to the depth of the soil formation layer.

In the invention according to claim 3 of the present invention, in the invention according to claim 1 or 2,
The operation mechanism has a first member mounted on the vehicle body fixing portion via a first pivot portion so as to be swingable about a left-right axis, and a left-right axis as a fulcrum. The second case is installed on the transmission case side through the second pivotal support portion so as to be able to swing, and extends from the vehicle body fixing portion side to the transmission case side along the longitudinal direction of the vehicle body. And the second member is displaced in the erection direction with respect to the first member, so that the swing operation of the transmission case is performed,
The first pivot portion and the second pivot portion are fixed to the vehicle body fixing portion side and the first member, or the shaft member provided on the transmission case side and the second member, and the vehicle body fixing portion. It comprises a holder member provided to be fitted on the shaft member on the other side of the part side and the first member, or on the other side of the transmission case side and the second member,
The shaft member and the holder member of one or both of the first pivot part and the second pivot part are formed to have a larger diameter than the first member or the second member. .

  According to this characteristic configuration, the surface pressure applied to the shaft member and the holder member can be reduced by forming the shaft member and the holder member with a large diameter. Thereby, durability of a shaft member and a holder member can be improved. In addition, it is possible to adopt a resin-made one that is advantageous in terms of weight and molding for either or both of the shaft member and the holder member. Can be facilitated.

  In addition, by configuring the first pivot part and the second pivot part as described above, the assembly of the first member and the second member to the vehicle body can be easily performed by inserting the vehicle body from the lateral direction or the like. .

  Therefore, it is possible to improve durability and assemblability, and to reduce the weight and facilitate molding.

In the invention according to claim 4 of the present invention, in the invention according to any one of claims 1 to 3,
The operating mechanism includes a hydraulic cylinder installed over the vehicle body fixing portion side and the transmission case side along the longitudinal direction of the vehicle body,
The piping is connected to the hydraulic cylinder from above and below the hydraulic cylinder.

  According to this characteristic configuration, the hydraulic cylinder and the piping for the hydraulic cylinder overlap in the vertical direction, and the overhang of the piping in the lateral direction with respect to the hydraulic cylinder can be suppressed or prevented. Thereby, the increase in the left-right width of the vehicle body due to the overhang of the pipe in the lateral direction can be suppressed.

  In addition, since the threaded connection of piping to the hydraulic cylinder, which is generally performed, is performed from the vertical direction to the hydraulic cylinder, the loosening direction of the piping differs from the vibration direction of the hydraulic cylinder. Thus, it is possible to suppress the occurrence of looseness in the connection of the pipe to the hydraulic cylinder due to the vibration of the hydraulic cylinder.

  Therefore, it is possible to suppress a decrease in handling performance as a walking rice transplanter due to an increase in the left-right width of the vehicle body, and the occurrence of loosening at a pipe connection point with respect to the hydraulic cylinder due to vibration of the hydraulic cylinder.

In the invention according to claim 5 of the present invention, in the invention according to claim 4,
Adopting a double acting type as the hydraulic cylinder,
One end portion of the cylinder tube in the hydraulic cylinder is connected to a lower portion of the vehicle body fixing portion located below the swing fulcrum of the transmission case, and the other end portion of the cylinder tube is connected to the transmission case. Connect to the upper part of the transmission case located above the swing fulcrum,
A pipe is connected to one end of the cylinder tube from above the hydraulic cylinder, and a pipe is connected to the other end of the cylinder tube from below the hydraulic cylinder.

  According to this characteristic configuration, transmission with the propulsion wheels is caused by the resistance of the soil formation layer as it is drawn to the rear side of the vehicle body in the field where the soil formation layer is deep, which may be caused when a single-acting hydraulic cylinder is adopted. It is possible to avoid the inconvenience that the case is raised and the vehicle body is lowered.

  In addition, the height position of the piping with respect to the hydraulic cylinder can be set along the height position of the hydraulic cylinder, thereby suppressing the adhesion of mud to the piping connected to one end of the cylinder tube. The piping connected to the other end of the cylinder tube facilitates maintenance from above on various devices arranged around the hydraulic cylinder.

  Accordingly, it is possible to avoid the possibility that the vehicle height is unexpectedly lowered, to suppress the adhesion of mud to the pipe, and to improve the maintainability of the peripheral devices of the hydraulic cylinder.

  Hereinafter, as an example of the best mode for carrying out the present invention, an embodiment in which the vehicle body height adjustment structure of a walking work machine according to the present invention is applied to a walking rice transplanter that is an example of a walking work machine is based on the drawings. I will explain.

  FIG. 1 is an overall left side view of the walking rice transplanter, FIG. 2 is an overall right side view of the walking rice transplanter, and FIG. 3 is an overall plan view of the walking rice transplanter. The walking rice transplanter is configured by mounting a seedling planting device 2 for two-row planting on a one-wheeled and walking traveling vehicle body 1.

  FIG. 4 is a plan view showing the structure of the front half of the walking rice transplanter. As shown in FIGS. 1 to 4, the traveling vehicle body 1 has an engine 3 and a transmission case (hereinafter referred to as T / M) that is also used as a frame. 4) and the like, and a single traveling transmission case 5, a single propulsion wheel 6, a pair of left and right first side frames 7, and a pair of left and right second sides. A frame 8 and the like are equipped, and a control portion 9 is formed at the rear portion.

  FIG. 5 is a left side view of the main part showing the configuration around the engine and around the T / M case. As shown in FIGS. 1 to 5, the engine 3 employs a recoil starter type gasoline engine. The T / M case 4 is connected to the left side. A fuel tank 10 is provided directly above the engine 3 and the upper cover 11 is displaceable between a work position that covers the upper part of the engine 3 and the fuel tank 10 from above and a maintenance position that opens the upper cover. It is.

  The T / M case 4 includes right and left main cases 12 and 13, a gear cover 14 that is detachably attached to the left main case 12, and a right side so as to extend rightward from a front lower portion of the right main case 13. A cylindrical case 15 connected to the main case 13, a gear case 16 connected to the right end, which is an extended end of the cylindrical case 15, and the like. The left main case 12 has a connecting portion 12 </ b> A for the left first side frame 7 formed at the front lower portion of the side wall thereof. The right main case 13 is formed with a cylindrical connecting portion 13A for the transmission case 5 at the rear lower portion of the side wall thereof.

  As shown in FIGS. 1 to 4, the transmission case 5 includes a first gear case 17 connected to the connecting portion 13 </ b> A of the right main case 13 so that the transmission case 5 can be rotated about a left-right axis P <b> 1 as a fulcrum. With a cylindrical shaft case 18 extending rearward from the first gear case 17 and a second gear case 19 connected to the extending end of the shaft case 18, the left-right axis P1 is used as a fulcrum. Thus, it is configured to be able to swing in the vertical direction. The propulsion wheel 6 is supported by the second gear case 19 so that the propulsion wheel 6 is positioned on the left lateral side.

  The left and right first side frames 7 are made of a round pipe material or the like so as to serve also as a transmission case. The left first side frame 7 is connected at its front end to the connecting portion 12A of the left main case 12 so as to extend rearward from the left end of the T / M case 4. The front end of the right first side frame 7 is connected to the gear case 16 so as to extend rearward from the right end of the T / M case 4.

  The left second side frame 8 is formed such that its lower end functions as a transmission case, and is connected to the rear end of the left first side frame 7. The right second side frame 8 is formed so as to function entirely as a transmission case, and is connected to the rear end of the right first side frame 7.

  The control unit 9 includes a pair of left and right handle frames 20, a control handle 21 having a pair of left and right grips 21A and 21B, an operation lever 22 for raising and lowering, an operation lever 23 for adjusting the engine speed, a clutch lever 24 for planting, And the clutch lever 25 for driving | running | working, etc. are arrange | positioned and formed in the rear part of the traveling vehicle body 1. FIG.

  The left and right handle frames 20 extend rearward and upward from the corresponding second side frames 8. The steering handle 21 can be adjusted in height according to the physique by a swinging operation in the vertical direction with a horizontal axis (not shown) as a fulcrum, and the gripping portions 21A and 21B are mounted on the vehicle body. It is constructed over the free end portions of the left and right handle frames 20 so that the posture can be switched between a working posture extending rearward and a retracted posture extending downward.

  As shown in FIGS. 1 to 3, the lifting operation lever 22 is swung in the left-right direction with a vertical axis (not shown) as a fulcrum by the thumb of the hand gripping the left gripping portion 21A. In order to allow operation, the steering handle 21 is disposed in front of the left grip 21A.

  The operation lever 23 for adjusting the engine speed can be swung in the left-right direction with a vertical axis (not shown) as a fulcrum by the thumb of the hand holding the right holding part 21B. Further, the steering handle 21 is arranged at a position in front of the right gripping part 21B.

  The planting clutch lever 24 is operated so that a hand holding the left gripping portion 21A can be gripped in the vertical direction with a horizontal axis (not shown) as a fulcrum. Is extended from the front position of the left gripping portion 21A toward the lower side of the left gripping portion 21A.

  The travel clutch lever 25 is operated so that a hand gripping the right gripping portion 21B can be operated in the vertical direction with a horizontal axis (not shown) as a fulcrum. Is extended from the front position of the right grip 21B toward the lower side of the right grip 21B.

  As shown in FIGS. 1 to 4, the seedling planting device 2 is provided with a pair of left and right leveling floats 26 for leveling the seedling planting position in the paddy field on the left and right of the propulsion wheel 6 as the vehicle travels. The seedling stage 27 for placing the mat-like seedlings, the lateral feed mechanism 28 for reciprocating the seedling stage 27 with a constant stroke in the left-right direction, and the seedling stage 27 each time the seedling stage 27 reaches the left and right stroke ends. A vertical feed mechanism 29 that moves each mat-like seedling placed on the seedling base 27 downwardly by a predetermined amount, and a predetermined amount of seedlings from the lower end of the mat-like seedling placed on the seedling placing stand 27 A pair of left and right planting mechanisms 30 that are cut and planted in a paddy field are provided between the left and right second side frames 8 and the control unit 9.

  The left and right leveling floats 26 are equipped to swing up and down with respect to the traveling vehicle body 1 with a horizontal axis (not shown) set at the rear thereof as a fulcrum. The left and right planting mechanisms 30 are arranged so as to be arranged at a predetermined interval in the left-right direction of the traveling vehicle body 1.

  FIG. 6 is a schematic plan view showing the transmission configuration of the walking rice transplanter, FIG. 7 is a vertical right side view of the T / M case 4, and FIG. 8 is an exploded sectional view of a main part showing the transmission configuration for traveling. FIG. 9 is a cross-sectional plan view of the main part showing the transmission configuration for traveling. As shown in these drawings, in this walking rice transplanter, the engine 3 and the output shaft 31 of the left side are T / M. The posture is set so as to extend toward the case 4, the power from the output shaft 31 is shifted by the transmission 32 provided inside the T / M case 4, and the power after the shift is used for the traveling transmission system 33. Is transmitted to the propulsion wheel 6 via.

  As shown in FIGS. 6 to 8, the transmission 32 has a cylindrical shaft that is fitted on the left and right first shaft 34 provided on the upper portion of the T / M case 4, and the output shaft 31 and the first shaft 34 of the engine 3. 35, a key 36 for connecting the shafts 31, 34 and 35 so as to rotate integrally, a second shaft 37 facing left and right provided on the rear side of the intermediate portion in the vertical direction of the T / M case 4, and a first shaft 34 A first transmission gear 38 for low-speed transmission integrally formed, a second transmission gear 39 for high-speed transmission integrally formed with the cylindrical shaft 35, and a second transmission shaft 37 so as to be engaged with the second shaft 37 so as to engage with the first transmission gear 38. The third transmission gear 40 for low-speed transmission and the fourth transmission gear 41 for high-speed transmission that are externally fitted to the second shaft 37 so as to mesh with the second transmission gear 39 and the second shaft 37 are spline-fitted. By sliding the shift member 42 with the shifted shift member 42, etc. A low speed state where the shift member 42 meshes with the third transmission gear 40 and rotates integrally with the third transmission gear 40, and a high speed where the shift member 42 meshes with the fourth transmission gear 41 and rotates integrally with the fourth transmission gear 41. It is configured so that the state can be switched between two levels of high and low.

  The travel transmission system 33 includes a left and right third shaft 43 provided on the rear side of the bottom of the T / M case 4, a front and rear transmission shaft 44 provided on the transmission case 5, and a left and right direction provided on the second gear case 19. The first reduction gear 46 that rotates integrally with the second axle 37, the second reduction gear 47 that is externally fitted to the third shaft 43 so as to be rotatable relative to the first reduction gear 46, and the third shaft 43. The traveling clutch 48 provided in the first gear case 17 and the pair of bevel gears 49 and 50 provided in the first gear case 17 so as to reduce the transmission from the third shaft 43 to the transmission shaft 44. The second gear case 19 includes a pair of bevel gears 51, 52, and the like.

  The travel clutch 48 includes a second reduction gear 47, a shift member 53 that is spline-fitted to the third shaft 43, and a biasing spring 54 that meshes and biases the shift member 53 toward the second reduction gear 47. Due to the sliding operation of the shift member 53 by the biasing of the biasing spring 54, the transmission state in which the shift member 53 meshes with the second reduction gear 47 and rotates together with the second reduction gear 47, and the biasing of the biasing spring 54 The shift member 53 can be switched to a shut-off state in which the shift member 53 disengages from the second reduction gear 47 and stops the integral rotation with the second reduction gear 47 by sliding operation of the shift member 53 against the above. It is.

  10 is a cross-sectional plan view of the main part showing the working transmission configuration, FIG. 11 is a developed cross-sectional view of the main part showing the working transmission configuration, and FIG. 12 shows the transmission to the planting mechanism 30 on the left side. FIG. 13 is a developed cross-sectional view of the main part showing the configuration and the support structure of the lateral feed mechanism 28, and FIG. 13 is a developed cross-sectional view of the main part showing the transmission structure for the right planting mechanism 30 and the lateral feed mechanism 28. 6, FIG. 7 and FIGS. 9 to 13, in this walking rice transplanter, the power after shifting by the transmission 32 is transmitted to the seedling planting device 2 through the planting transmission system 55.

  The planting transmission system 55 includes a left-right stock transmission shaft 56 provided on the front side of the intermediate portion in the vertical direction of the T / M case 4 and a left-right power distribution provided on the front side of the bottom of the T / M case 4. Shaft 57, front-rear transmission shaft 58 provided on each left and right first side frame 7, left-right planting drive shaft 59 provided on each left and right second side frame 8, second shaft 37 and inter-stock transmission shaft 56 A stock transmission 60, a first reduction gear 61 that rotates integrally with the stock transmission shaft 56, a second reduction gear 62 that is relatively rotatable on the power distribution shaft 57 so as to mesh with the first reduction gear 61, A gear case 16 and a connecting portion 12A located at both left and right ends of the T / M case 4 so as to be transmitted from the power distribution shaft 57 to the left and right transmission shafts 58, the torque limiter 63 and the planting clutch 64 provided in the power distribution shaft 57. And in preparation A pair of bevel gears 65, 66, a pair of bevel gears 67, 68 provided on the left and right second side frames 8 for transmission from the left and right transmission shafts 58 to the left and right planting drive shafts 59, and the right second side frame 8 The lateral feed transmission device 69 and the chain transmission type transmission device 70 are provided.

  Then, the transmission shaft 58 provided on the left and right first side frames 7, the planting drive shaft 59 provided on the left and right second side frames 8, and the bevel gears 67 and 68, the corresponding planting from the power distribution shaft 57. Left and right planting transmission mechanisms A that transmit to the mechanism 30 are configured. Further, the left and right first side frames 7 and the left and right second side frames 8 are also used as a transmission case surrounding the corresponding planting transmission mechanism A.

  The stock transmission shaft 56 is cantilevered on the left main case 12 of the T / M case 4. The power distribution shaft 57 includes a left transmission shaft 71 including a torque limiter 63 and a planting clutch 64, and a cylindrical intermediate transmission shaft 72 that is fitted on the right end of the left transmission shaft 71 so as to rotate integrally with the left transmission shaft 71. And a right transmission shaft 73 fitted into the right end portion of the intermediate transmission shaft 72 so as to rotate integrally with the intermediate transmission shaft 72.

  The inter-company transmission 60 is a first inter-gear gear 74 detachably fitted to the left end of the second shaft 35 so as to rotate integrally with the second shaft 35, and an inter-stock shift so as to rotate integrally with the inter-shaft transmission shaft 56. The second inter-gear gear 75 is detachably fitted to the left end portion of the shaft 56. The first inter-gear gear 74 and the second inter-gear gear 75 are arranged in a storage space formed by the left main case 12 and the gear cover 14 in the T / M case 4, and the gear cover 14 is removed from the left main case 12. By removing the gears, the gears can be changed by changing the gear ratio by changing the inter-stock gears 74 and 75 with respect to the second shaft 35 and the inter- stock transmission shaft 56 or replacing them with ones having different numbers of teeth.

  FIG. 14 is a cross-sectional plan view of the main part showing the configuration of the torque limiter 63 and the planting clutch 64. As shown in FIGS. 6, 11, and 14, the torque limiter 63 includes the second reduction gear 62, the power A cylindrical shaft 76 interposed between the distribution shaft 57 and the second reduction gear 62 so as to be relatively rotatable, a shift member 77 spline-fitted to the cylindrical shaft 76, and the shift member 77 are engaged with the second reduction gear 62. The shift member 77 is engaged with the second reduction gear 62 by the action of the urging spring 78 by the urging spring 78 that urges and the spring receiving member 79 that is spline-fitted to the cylinder shaft 76. The shift member 53 releases the meshing with the second reduction gear 62 against the urging of the urging spring 78 on the basis of the transmission state that rotates integrally with the 62 and the overload on the planting mechanism 30. Stops integral rotation with reduction gear 62 In a cutoff state that, and are configured to switch.

  The planting clutch 64 includes a spring receiving member 79 of the torque limiter 63, a shift member 80 that is spline-fitted to the power distribution shaft 57, and a biasing spring 81 that meshes and biases the shift member 80 toward the spring receiving member 79, For example, when the shift member 80 is slid by the urging of the urging spring 81, the shift member 80 meshes with the spring receiving member 79 and rotates together with the spring receiving member 79, and the urging spring 81 is attached. The shift member 80 can be switched to a shut-off state in which the shift member 80 releases the engagement with the spring receiving member 79 and stops the integral rotation with the spring receiving member 79 by sliding operation of the shift member 80 against the force. is there.

  The lateral feed transmission 69 rotates integrally with the first transmission gear 82 detachably fitted to the right end of the planting drive shaft 59 and the relay shaft 83 so as to rotate integrally with the right planting drive shaft 59. Thus, the second transmission gear 84 is detachably fitted to the right end of the relay shaft 83. The first transmission gear 82 and the second transmission gear 84 are arranged in a storage space formed by the right second side frame 8 and the gear cover 85, and the gear cover 85 is removed from the right second side frame 8. Thus, it is possible to change the gear ratio by changing the gears 82 and 84 with respect to the right planting drive shaft 59 and the relay shaft 83 or replacing them with gears having different numbers of teeth.

  The chain transmission type transmission device 70 transmits the power after the shift by the lateral feed transmission device 69 to the lateral feed drive shaft 86 of the lateral feed mechanism 28. At both ends of the lateral feed drive shaft 86, a drive arm 87 that drives the longitudinal feed mechanism 29 whenever the seedling stage 27 reaches the left and right stroke ends is equipped so as to rotate integrally with the lateral feed drive shaft 86. is there.

  As shown in FIG. 11, the torque limiter 63 and the planting clutch 64 are positioned inside the T / M case 4 and between the left and right first side frames 7, which are transmission cases provided at the left and right outer ends of the vehicle body. It is arranged as follows. That is, the heavy torque limiter 63 and the planting clutch 64 of the transmission system 88 provided inside the T / M case 4 are positioned on the left and right center side of the vehicle body. As a result, the left / right balance of the vehicle body can be improved.

  Further, the transmission system 88 provided in the inside of the T / M case 4 is arranged so as to be located on the inner side of the vehicle body with respect to the laterally outermost ends of the left and right first side frames 7 in the vehicle body direction. Thereby, in the T / M case 4, there is no portion that protrudes laterally outward from the left and right first side frames 7. As a result, the left / right balance of the vehicle body can be improved. Further, when the vehicle body is tilted in the left-right direction during turning, the T / M case 4 can be made difficult to be immersed in the mud surface of the paddy field, and the T / M caused by the T / M case 4 being immersed in the mud surface. A decrease in the durability of the case 4 can be prevented.

  And as mentioned above, by installing the heavy torque limiter 63 and the planting clutch 64 on the power distribution shaft 57 arranged at the bottom of the T / M case 4, the center of gravity of the vehicle body can be lowered, The stability of the vehicle body can be improved.

  As shown in FIGS. 6, 7, 10, and 11, in this walking rice transplanter, as described above, the inter-shaft transmission shaft 56 is cantilevered on the left main case 12 in the T / M case 4. is there. Thereby, the freedom degree of arrangement | positioning of the inter-shaft transmission shaft 56 can be raised compared with the case where the inter-shaft transmission shaft 56 is supported by the T / M case 4 at both ends. And since the freedom degree of arrangement | positioning becomes high in this way, with respect to the 3rd transmission gear 40 and the 4th transmission gear 41 with which the 2nd axis | shaft 35 was equipped, each inter-company gears 74 and 75 of the inter-company transmission 60 are side surfaces. The T / M case 4 can be made compact by this arrangement, and the amount of oil stored in the T / M case 4 can be reduced by this compaction. The weight of the vehicle body can be reduced by reducing the amount of oil and making the T / M case 4 compact.

  Further, as described above, in this walking rice transplanter, the inter-shaft transmission 60 is provided across the second shaft 37 and the inter-shaft transmission shaft 56. On the other hand, for example, when the inter-equipment transmission 60 is configured to be installed across the inter-variety transmission shaft 56 and the power distribution shaft 57, in order to enable shifting by changing or exchanging the inter-gear gears 74 and 75, It is necessary to arrange the inter-shaft transmission 60 so as to be located on the left outer side with respect to the bevel gear 65 provided at the left end portion of the power distribution shaft 57 for transmission to the transmission shaft 58 provided in the left first side frame 7. Arise. As a result, it is necessary to form a portion of the T / M case 4 that protrudes from the left first side frame 7 to the left outer side of the vehicle body. Sometimes, when the vehicle body is tilted in the left-right direction, the T / M case 4 is likely to be immersed in the mud surface of the paddy field, and the durability of the T / M case 4 due to the T / M case 4 being immersed in the mud surface. It tends to cause a decrease.

  In other words, by installing the inter-equipment transmission 60 across the second shaft 37 and the inter-variety transmission shaft 56, it is possible to improve the left-right balance of the vehicle body while enabling shifting by changing or exchanging the inter-gear gears 74 and 75. In addition, it is possible to prevent a decrease in durability of the T / M case 4 due to the T / M case 4 being immersed in the mud surface.

  As shown in FIGS. 5 and 7, the transmission 32 rotates the eccentric cam type operation member 89 provided on the upper portion of the T / M case 4 with its axis (not shown) as a fulcrum. Thus, the shift member 42 is configured to slide along the second shaft 37. The operation member 89 is linked to a speed change lever (not shown) provided in the control unit 9 via an operation rod 90 or the like.

  15 is a longitudinal left side view of the main part showing the operation structure of the travel clutch 48, and FIG. 16 is a rear view of the main part showing the operation structure of the travel clutch 48. FIG. 2, FIG. 8, FIG. As shown in FIG. 16, an operation arm 91 as an operation unit for the traveling clutch 48 provided inside the T / M case 4 is arranged at the rear part of the T / M case 4 facing the propulsion wheel 6. The operation arm 91 is connected to the shift fork 92 via a support shaft 93 facing forward and backward so as to swing integrally with the shift fork 92 provided inside the T / M case 4. The free end of the operation arm 91 is linked to a traveling clutch lever 25 provided in the control unit 9 via an operation wire 94. The shift fork 92 is engaged with the shift member 53 of the travel clutch 48.

  With this linkage, the travel clutch 48 can be switched from the transmission state to the disconnected state by operating the clutch lever 25 for traveling toward the grip portion 21B of the steering handle 21 together. And the clutch lever 25 for driving | running | working can be hold | maintained in the interruption | blocking position by the effect | action of the holding mechanism (not shown) with which the control part 9 was equipped, and the driving | running | working clutch 48 can be maintained in the interruption | blocking state. Further, by holding the release lever 95 provided on the right grip 21B toward the grip 21B, the holding of the clutch lever 25 by the holding mechanism can be released, and the biasing spring 54 of the travel clutch 48 can be released. As a result, the traveling clutch 48 can be returned from the disconnected state to the transmission state, and the clutch lever 25 can be returned from the disconnected position to the transmission position.

  Further, by disposing the operation arm 91 for the traveling clutch 48 at the rear part of the T / M case 4 positioned above the lower part of the T / M case 4, mud splash from the mud surface with respect to the operation arm 91 and the like. As a result, it is possible to suppress the operation failure of the traveling clutch 48 due to the mud adhering to the operation arm 91 or the like.

  As shown in FIGS. 8, 15 and 16, mud splash from the propulsion wheel 6 to the engine 3, the T / M case 4, etc. between the T / M case 4 and the propulsion wheel 6 located behind the T / M case 4. A mud cover 96 is provided to prevent this. The operation wire 94 for the travel clutch 48 is arranged so that the inner wire 97 is connected to the operation arm 91 so that the end of the operation wire 94 moves in and out of the outer wire 98 within a predetermined area covered by the mudguard cover 96. I'm looking for it. As a result, even if the space between the T / M case 4 and the propulsion wheel 6 is narrowed to shorten the overall length of the vehicle body, mud splashing from the propulsion wheel 6 to the inner wire 97 can be reliably prevented. Further, it is possible to effectively prevent the operation failure of the traveling clutch 48 due to mud adhering to the inner wire 97 while reducing the size of the vehicle body.

  As shown in FIGS. 1, 5, 7, and 14, an operation shaft 97 as an operation unit for the planting clutch 64 provided inside the T / M case 4 is provided on the front surface of the T / M case 4. It has been deployed. The operation shaft 97 is slidable so that it can be slidably moved between a working position that contacts the riding-type cam surface 80A formed on the shift member 80 of the planting clutch 64 and a retracted position that is separated from the cam surface 80A. / M is supported by the case 4. A front end portion of the operation shaft 97 is linked to a planting clutch lever 24 provided in the control unit 9 via a swing arm 98 and an operation wire 99. The swing arm 98 is supported by the T / M case 4 so as to swing about a horizontal axis (not shown) as a fulcrum. An urging spring 100 that urges the operation shaft 97 to return to the retracted position is installed over the T / M case 4 and the swing arm 98.

  With this linkage, the planting clutch 64 can be switched from the transmission state to the shut-off state by operating the planting clutch lever 24 together with the gripping portion 21A of the steering handle 21. The planting clutch lever 24 can be held in the shut-off position by the action of a holding mechanism (not shown) provided in the control unit 9, and the planting clutch 64 can be maintained in the shut-off state. Further, by holding the release lever 101 provided on the left gripping portion 21A toward the gripping portion 21A, the holding of the clutch lever 24 by the holding mechanism can be released, and the biasing spring of the planting clutch 64 can be released. By the action of 81 and the urging spring 110 for operation, the planting clutch 64 can be returned from the disconnected state to the transmission state, and the clutch lever 24 can be returned from the cutoff position to the transmission position.

  Further, the operation shaft 97 for the planting clutch 64 is provided on the front surface portion of the T / M case 4 where the operation member 89 for the transmission 32 and the operation arm 91 for the traveling clutch 48 do not exist. An operation mechanism B for a planting clutch including a moving arm 98 and an operation wire 99, an operation mechanism C for shifting including an operation rod 90 for the transmission 32, an operation arm 91 and an operation wire 94 for the traveling clutch 48, and the like. Therefore, the operation mechanism B for the planting clutch can be used as the operation mechanism C for the shift clutch or the operation mechanism for the travel clutch. The possibility of interfering with D can be effectively prevented.

  Further, by arranging the operation shaft 97 for the planting clutch 64 on the front surface portion of the T / M case 4 where the propulsion wheel 6 does not exist, mud splashing from the propulsion wheel 6 to the operation shaft 97 and the like can be prevented. Occurrence of poor operation of the planting clutch 64 due to mud adhering to the operation shaft 97 or the like can be effectively prevented.

  Moreover, in order to equip the front part of the T / M case 4 with the operation shaft 97 for the planting clutch 64, a heavy planting clutch 64 and the like are arranged on the front side of the T / M case 4, As a result, it is possible to improve the front-rear balance of the traveling vehicle body 1 in which the engine 3 and the T / M case 4 are arranged on the front side and the seedling planting device 2 and the like are arranged on the rear side. Can be improved.

  The planting clutch 64 has a planting operation locus (not shown) drawn by each planting mechanism 30 when the cam surface 80A of the shift member 80 is switched from the transmission state to the shut-off state by riding on the operation shaft 97. ), The operation is stopped in a state of being located at the upper part. That is, the planting clutch 64 is configured to have a function as an upper limit stop mechanism that stops the operation of each planting mechanism 30 at the upper limit position.

  As shown in FIGS. 5 and 7, a partition wall 103 for forming a breather chamber 102 is formed inside the T / M case 4 thereafter. A breather 104 extending from the breather chamber 102 is mounted on the rear upper part of the T / M case 4. The breather 104 is formed in a U-shape by a round pipe material, and both ends of the breather 104 are directed downward, and the exposed end is positioned rearward of the T / M case 4 in a T / M position. It is attached to the case 4.

  Accordingly, it is possible to prevent the oil stored in the T / M case 4 from being leaked from the breather 104 by being scraped up by the third transmission gear 40, the fourth transmission gear 41, or the like during traveling. Further, even when the vehicle body is switched to the inverted posture that is raised with the front portion of the vehicle body facing down for transportation, the oil stored in the T / M case 4 leaks from the breather 104. The fear can be prevented.

  17 is a longitudinal rear view of the main part showing the hydraulic configuration, FIG. 18 is a cross-sectional plan view of the upper side of the main part showing the hydraulic configuration, FIG. 19 is a vertical left side view of the main part showing the hydraulic configuration, FIG. 20 is a cross-sectional plan view of the lower part of the main part showing the hydraulic configuration. As shown in FIGS. 4 to 6, 8 and 17 to 20, a hydraulic unit 105 is provided on the upper left side of the T / M case 4. It has been deployed.

  The hydraulic unit 105 includes a first recess 106A for forming a hydraulic pump, a second recess 106B for forming a control valve, and a third recess 106C for forming a relief valve in a hydraulic block 106 connected to the left side of the T / M case 4. , A supply oil passage 106D, a return oil passage 106E, a first supply / discharge oil passage 106F, a second supply / discharge oil passage 106G, and a discharge oil passage 106H are formed, and a trochoidal hydraulic pump 107 is formed in the first recess 106A. The second recess 106B is provided with a spool 108, and the third recess 106C is provided with a relief valve 109.

  The hydraulic pump 107 may have a different structure such as a gear pump, a plunger pump, or a vane pump.

  As shown in FIGS. 8 and 17 to 20, the first recess 106 </ b> A is configured so that the hydraulic pump 107 can be driven by the first shaft 34 projecting from the T / M case 4 toward the left outer side. It is formed on the right side surface of the hydraulic block 106 connected to the T / M case 4. As a result, the first shaft 34 of the T / M case 4 can also be used as a pump shaft.

  The second recess 106B is formed in the left-right direction from the left side surface of the hydraulic block 106 toward the inside of the hydraulic block 106 so that the left outer side portion of the hydraulic unit 105 can be used as a spool operation unit. . Then, the spool 108 is mounted on the second recess 106B so that the spool 108 can be rotated about its axis (not shown) as a fulcrum, so that the spool 108 can be adjusted as a control valve for adjusting the vehicle body height. Can function as.

  The third recess 106C extends from the right side surface of the hydraulic block 106 connected to the T / M case 4 to the supply oil passage 106D and the return oil passage 106E formed in the left-right direction toward the inside of the hydraulic block 106. It is formed vertically from the upper surface of 106 toward the inside of the hydraulic block 106. Thereby, substantially the entire third recess 106C can be used as a part of the return oil passage. The relief valve 109 is configured by disposing the poppet 110 and a biasing spring 111 for closing and biasing the poppet 110 in the third recess 106C, and closing the third recess 106C with the plug 112 serving as a spring receiver. can do.

  That is, in the hydraulic unit 105, the relief valve 109 is equipped so that the axial center direction of the poppet 110 is the vertical direction perpendicular to the first shaft 34. As a result, the left and right direction of the hydraulic unit 105 is compared with the case where the relief valve 109 is mounted so that the axial direction of the poppet 110 is the left and right direction along the axial center (not shown) of the first shaft 34. The center of gravity of the hydraulic unit 105 can be brought closer to the left and right center of the vehicle body. By adjusting the position of the center of gravity, the moment of inertia is less likely to act when the vehicle body is tilted in the left-right direction, and as a result, the handleability as a walking rice transplanter can be improved.

  Further, by installing a relief valve 109 on the hydraulic unit 105 disposed on the left side of the T / M case 4 in the vertical direction, the third recess 106C is connected to the supply oil passage 106D communicating with the inside of the T / M case 4. It can be formed so as to extend over the return oil passage 106E, thereby reducing the number of holes drilled when forming the return oil passage 106E compared to the case where the relief valve 109 is installed in the left-right direction, Manufacturing can be facilitated and costs can be reduced.

  In addition, since the plug position of the relief valve 109 is not located on the left outer side of the hydraulic unit 105 used as the spool operation portion, the operation system for the spool 108 is less likely to become an obstacle when performing maintenance on the relief valve 109. As a result, the maintainability of the relief valve 109 can be improved.

  Incidentally, the relief valve 109 may be provided in the hydraulic unit 105 so that the axial center direction of the poppet 110 is the front-rear direction orthogonal to the first shaft 34.

  As shown in FIGS. 1, 3, 4, 17, and 20, a swing arm 113 that moves integrally with the spool 108 is connected to the left end portion of the spool 108 with the shaft center of the spool 108 as a fulcrum. is there. The swing arm 113 is linked to an operation lever 22 for raising and lowering provided in the control unit 9 via an operation wire 114. That is, the spool 108 can be turned by operating the operation lever 22 for raising and lowering.

  21 is a longitudinal left side view of the main part showing the operation of the spool 108, and FIG. 22 is a right side view of the main part showing the hydraulic piping for adjusting the vehicle body height, as shown in FIGS. As shown in 18 to 22, the hydraulic unit 105 is connected to a double-acting hydraulic cylinder 115 provided for adjusting the vehicle body height on the right side of the traveling vehicle body 1 through a pair of metal pipes 116 and 117. It is. With this connection, when the spool 108 of the hydraulic unit 105 is switched from the neutral position to the raised position by operating the raising / lowering operating lever 22, the hydraulic cylinder 115 is operated to extend the oil pumped by the hydraulic pump 107. The oil is supplied to the oil chamber (not shown) and is expelled when the oil is discharged from the oil chamber (not shown) for shortening operation. When the spool 108 is switched from the neutral position to the lowered position, the oil pumped by the hydraulic pump 107 is supplied to the oil chamber for shortening operation, and the oil is discharged from the oil chamber for extension operation. This shortens the operation. When the spool 108 is switched from the raised position or the lowered position to the neutral position, the operation is stopped by stopping the supply and discharge of oil to the oil chamber for extension operation and the oil chamber for shortening operation.

  The hydraulic cylinder 115 is disposed so as to be positioned on the right outer side of the engine 3 in a posture along the longitudinal direction of the vehicle body. A pipe 116 connected to the oil chamber for the extension operation of the hydraulic cylinder 115 passes through the front of the engine 3 from the hydraulic unit 105 and passes from the right outer side of the hydraulic cylinder 115 to the upper side of the hydraulic cylinder 115. The chamber is connected by screwing from above. A pipe 117 connected to the oil chamber for shortening operation of the hydraulic cylinder 115 passes through the front of the engine 3 from the hydraulic unit 105 and passes below the hydraulic cylinder 115 to be connected to the oil chamber for shortening operation by screwing from below. It is.

  That is, the pipes 116 and 117 are arranged so as to bypass the engine 3 so as to overlap the hydraulic cylinder 115 in the vertical direction, whereby the recoil rope 118 extending from the right side portion of the engine 3 is provided. In addition, it can be routed toward the control unit 9 without interfering with the hydraulic cylinder 115 and the pipes 116 and 117.

  Further, by connecting the pipes 116 and 117 to the hydraulic cylinder 115 from above and below, the loosening direction can be made different from the vibration direction of the hydraulic cylinder 115, resulting in the vibration of the hydraulic cylinder 115. Thus, it is possible to prevent the connection of the pipes 116 and 117 to the hydraulic cylinder 115 from being loosened.

  FIG. 23 is a plan view of the main part showing the vehicle body height adjustment structure, and FIGS. 24 and 25 are right side views of the main part showing the vehicle body height adjustment structure, as shown in FIGS. 4 and 22 to 25. In addition, the hydraulic cylinder 115 has an end portion on the piston rod side so as to span the swing arm 119 that swings integrally with the transmission case 5 and the first side frame 7 on the right side with the left and right axis P1 as a fulcrum. Is pivoted on the swing arm 119 and the end on the cylinder tube side is pivotally supported on the first side frame 7 on the right side. The swing arm 119 is detachably attached to the right side of the transmission case 5 on the swing start end side so as to extend upward. As a result, the hydraulic cylinder 115 is mounted on the traveling vehicle body 1 in a forwardly raised posture in which the piston rod 121 as the second member extends from the cylinder tube 120 as the first member toward the front upper side.

  Then, the piping 117 is connected to the oil cylinder for shortening operation positioned on the upper side of the hydraulic cylinder 115 set in this way from below as described above, so that the piping 117 is connected to the hydraulic cylinder 115. It becomes possible to pass through a relatively low position similar to the piping 116 for the oil chamber for the extension operation located on the lower side, and as a result, maintenance of the engine 3 and its peripheral devices is facilitated.

  Further, with the configuration described above, the transmission case 5 is swung up and down around the axial center P1 as a fulcrum by operating the operating lever 22 for raising and lowering to expand and contract the hydraulic cylinder 115. Due to this up and down disturbance, the height of the propulsion wheel 6 with respect to the vehicle body can be changed, and the height of the vehicle body with respect to the ground can be adjusted. As a result, seedlings can be stably applied at a predetermined planting depth regardless of variations in the depth of the soil layer in the paddy field.

  In other words, the operation lever 22 for lifting and lowering, the swing arm 113, the operation wire 114, the hydraulic unit 105, the pipes 116 and 117, the hydraulic cylinder 115, and the like are transmitted within the swing range set by the operating stroke of the hydraulic cylinder 115. An operation mechanism E that swings the case 5 in the vertical direction is configured, and the vehicle body height adjusting mechanism F is configured by the operation mechanism E, the transmission case 5, the swing arm 119, and the like.

  As shown in FIGS. 22 to 25, the swing fulcrum portion of the swing arm 119 is a pair of one pair, and two sets in which the positions in the swing direction with the axis P <b> 1 facing the left and right as the fulcrum are different. A total of four connecting holes 119A to 118D are formed. That is, in the case where the swing arm 119 is attached to the transmission case 5 using the first set of connection holes 119A and 119C and the case where the swing arm 119 is attached using the second set of connection holes 119B and 119D, The mounting position of the swing arm 119 with respect to 5 differs depending on the swing direction thereof, so that the swing range in the vertical direction of the transmission case 5 set by the operating stroke of the hydraulic cylinder 115 is set to two levels. The setting can be changed to the swing range.

  Specifically, when the swing arm 119 is attached to the transmission case 5 using the first set of connection holes 119A and 119C, the swing range of the transmission case 5 is set to the swing range on the higher side with respect to the vehicle body. When the swing arm 119 is attached to the transmission case 5 using the second set of connection holes 119B and 119D, the swing range of the transmission case 5 is set to the lower side swing relative to the vehicle body. The moving range can be set.

  As a result, when working in a general paddy field where the soil layer extending from the cultivator to the paddy surface is relatively shallow, the swing arm 119 is attached to the transmission case 5 using the first set of connecting holes 119A and 119C. By attaching it, the height of the vehicle body can be adjusted appropriately according to the depth of the soil layer in this paddy field. Also, when working in Fukada, such as rainfed paddy fields (paddy fields without irrigation equipment), where the soil layer extending from the cultivator to the paddy field is relatively deep, swing using the second set of connection holes 119B and 119D. By attaching the arm 119 to the transmission case 5, it is possible to appropriately adjust the height of the vehicle body according to the depth of the soil layer in Fukada.

  That is, the four connecting holes 119A to 119D drilled in the swing fulcrum portion of the swing arm 119 are the swing arm with respect to the transmission case 5 in the swing direction of the transmission case 5 with the left and right axis P1 as a fulcrum. By changing the connecting position of 119, it functions as a swing range changing means G that changes the swing range of the transmission case 5 with the left and right axis P1 as a fulcrum. By the action of this swing range changing means, Regardless of the general paddy field and the Fukada field, the propulsion wheel 6 can be properly grounded to the tiller without immersing the upper side of the vehicle body in the paddy field, and the planting operation can be performed satisfactorily.

  Further, as the hydraulic cylinder 115, it is not necessary to employ a large hydraulic cylinder having a large operation stroke that can cope with a rocking range with respect to a general paddy field as well as a rocking range with respect to Fukada. It is possible to avoid an increase in vehicle body weight, a decrease in left / right balance, and an increase in cost, etc., which are caused by adopting 115.

  FIG. 26 is a vertical right side view of the main part showing the support structure of the hydraulic cylinder 115, and FIG. 27 is a vertical rear view of the main part showing the support structure of the hydraulic cylinder 115, as shown in FIGS. 4 and 22 to 27. As described above, the cylinder tube 120 of the hydraulic cylinder 115 is pivotally supported by the first side frame 7 on the right side via the first pivotal support portion 122. The piston rod 121 of the hydraulic cylinder 115 is pivotally supported by the swing arm 119 via the second pivotal support portion 123.

  The first pivot portion 122 includes a support shaft 124 as a shaft member extending leftward from the first side frame 7 on the right side so as to support the cylinder tube 120 of the hydraulic cylinder 115, and the support shaft 124. It is comprised by the holder part 125 as a holder member formed in the rear-end part of the cylinder tube 120 so that relative rotation around the axis P2 may be carried out relatively. The second pivotal support 123 swings so as to be fitted on the shaft member 126 so as to be relatively slidable with respect to the piston rod 121 of the hydraulic cylinder 115 and to be rotatably fitted around the shaft center P3 about the axis P3. A holder member 127 extending rightward from the arm 119 is configured.

  In the second pivotal support 123, the shaft member 126 is made of a resin having a large diameter substantially the same as that of the cylinder tube 120, and receives and supports a suspension spring 128 externally fitted to the tip of the piston rod 121. 126A is formed. The holder member 127 is made of a sheet metal having a C-shaped cross section, and has a long hole 127A that allows the piston rod 121 to be inserted and relatively oscillated.

  Since the shaft member 126 is formed to have a large diameter as described above, the surface pressure applied to the shaft member 126 can be reduced, which is advantageous for the shaft member 126 in terms of cost and molding. High durability can be obtained while reducing the weight by adopting resin. Further, by using the shaft member 126 also as a spring receiver, it is possible to improve the assemblability and reduce the cost by reducing the number of parts.

  In addition, since the first pivot support portion 122 and the second pivot support portion 123 are configured as described above, the hydraulic cylinder 115 can be easily assembled to the vehicle body by insertion from the right side of the vehicle body.

  The piston rod 121 includes a bearing tool 129 that receives the shaft member 126 of the second pivotal support 123 via a suspension spring 128, a holder receiver 130 that receives the holder member 127 of the second pivotal support 123, and the like. Yes.

  FIG. 28 is a right side view of the main part showing the self-supporting holding structure of the walking rice transplanter, and FIG. 29 is a plan view of the main part showing the self-supporting holding structure of the walking rice transplanter, FIGS. As shown in FIG. 29, the left and right first side frames 7 are equipped with stands 131 for holding the walking rice transplanter independently. The left and right stands 131 are substantially attached to the first side frame 7 on the front side of the vehicle body and the acting posture of hanging on the front side of the vehicle body with the horizontal axis (not shown) of the left and right first side frames 7 as a fulcrum. It is configured so that the posture can be switched between the storage posture and the storage posture. In addition, a tension spring 132 is installed between the left and right first side frames 7 and the corresponding left and right stands 131 to enable the posture of the stand 131 to be maintained by exceeding the dead point.

  With this configuration, the walking rice transplanter can be held independently by switching the stand 131 to the action posture. When the vehicle body is moved forward and enters the paddy field while maintaining the self-supporting state, the stand 131 automatically moves from the working posture to the retracted posture due to resistance from the mud of the paddy field on the stand 131. It will be switched. As a result, it is possible to prevent the vehicle body from sinking due to the stand 131 being switched to the action posture even after entering the paddy field.

  FIG. 30 is a longitudinal rear view of the main part showing the suspension support structure of the walking rice transplanter. As shown in FIGS. 1, 2, and 28 to 30, the walking rice transplanter can be suspended and conveyed. A plurality of hooks 133 are provided. Two of these hooks 133 on the front side of the vehicle body are formed on brackets 134 provided for connection to the T / M case 4 at the front end portions of the left and right first side frames 7. Further, the two on the rear side of the vehicle body are formed on a pair of left and right handle frames 20 and brackets 135 provided for supporting the leveling float 26, seedling mount 27 and the like.

  As a result, it is not necessary to equip dedicated parts for hanging and conveying, and as a result, it is possible to improve assembling and reduce costs by reducing the number of parts.

  FIG. 31 is a front view of the main part showing the fuel supply structure. As shown in FIGS. 1, 2, and 31, the fuel tank 10 is formed so that the discharge port 10A is inclined toward the lower right. In addition, the discharge port 10A is arranged near the carburetor 136 of the engine 3. Thereby, even if the fuel tank 10 is brought close to the upper end of the engine 3, piping from the discharge port 10A of the fuel tank 10 to the carburetor 136 can be easily performed.

  As shown in FIGS. 1 to 3 and FIG. 5, this walking rice transplanter is equipped with a work light 137. The work lamp 137 is supported by the hydraulic unit 105 protruding from the upper cover 11 via the support bracket 138 so that the direction of the work lamp 137 can be changed in the vertical and horizontal directions. Accordingly, the irradiation range can be widened and the degree of freedom in setting the irradiation direction can be increased as compared with the case where the work lamp 137 is provided inside the upper cover 11, and as a result, the work lamp 137 is used. It is possible to improve workability during night work.

    [Another embodiment]

[1] The walking work machine may be a walking tillage device or a binder.

[2] As the operation mechanism E, the hydraulic cylinder 115 may be a single-acting type. Further, instead of the hydraulic cylinder 115, a hydraulic motor or an electric motor may be adopted.

[3] The operation mechanism E is constructed such that a screw feed mechanism is installed over the vehicle body fixing portion side and the transmission case side, and the screw feed range of the screw feed mechanism is set to the swing range of the transmission case. There may be. In this configuration, one of the first member 120 and the second member 121 serves as a screw feed shaft, and the other serves as a screwing member that is screwed by the screw feed shaft.

[4] The hydraulic cylinder 115 may be equipped such that its piston rod serves as the first member 120 and its cylinder tube serves as the second member 121.

[5] As the swinging range changing means G, by changing the mounting position of the piston rod (second member) 121 with respect to the swinging arm (transmission case side) 119, transmission using the left and right axis P1 as a fulcrum. The case 7 may be configured to change the swing range in the vertical direction.

[6] The swing range changing means G may be configured to change the swing range in the vertical direction of the transmission case 7 using the left and right axis P1 as a fulcrum in three or more stages. Good.

[7] The support shaft 124, which is a shaft member of the first pivot support portion 122, may be formed to have a large diameter that is substantially the same diameter as the cylinder tube 120. Further, either one or both of the support shaft (shaft member) 124 of the first pivot support portion 122 and the shaft member 126 of the second pivot support portion 123 may be formed to have a larger diameter than the cylinder tube 120.

[8] Either one or both of the holder part (holder member) 125 of the first pivotal support part 122 and the holder member 127 of the second pivotal support part 123 are formed to have a large diameter substantially the same diameter as the cylinder tube 120. Also good.

Overall left side view of walking rice transplanter Overall right side view of walking rice transplanter Overall view of walking rice transplanter Plan view showing the configuration of the first half of the walking rice transplanter Left side view of the main part showing the configuration around the engine and around the T / M case Schematic plan view showing the transmission structure of walking rice transplanter T / M case vertical right side view Expanded sectional view of the main part showing the transmission configuration for traveling Cross-sectional plan view of the main part showing the transmission configuration for traveling Cross-sectional plan view of the main parts showing the work transmission configuration Expanded cross-sectional view of the main parts showing the work transmission configuration Expanded cross-sectional view of the main parts showing the transmission structure for the left planting mechanism and the support structure for the lateral feed mechanism Expanded cross-sectional view of the main parts showing the transmission configuration for the right planting mechanism and transverse feed mechanism Cross-sectional plan view of the main parts showing the configuration of the torque limiter and planting clutch Longitudinal left side view of the main part showing the operating structure of the travel clutch Rear view of the main part showing the operating structure of the travel clutch Longitudinal rear view of the main part showing the hydraulic configuration Transverse plan view of the main part upper side showing the hydraulic configuration Longitudinal left side view of the main part showing the hydraulic configuration Transverse plan view below the main part showing the hydraulic configuration Longitudinal left side view of the main part showing the operation of the spool Right side view of the main part showing hydraulic piping for vehicle body height adjustment Plan view of the main part showing the vehicle height adjustment structure Right side view of the main part showing the vehicle height adjustment structure Right side view of the main part showing the vehicle height adjustment structure Longitudinal right side view of the main part showing the support structure of the hydraulic cylinder Longitudinal rear view of main part showing support structure of hydraulic cylinder Right side view of the main part showing the self-supporting structure of the walking rice transplanter Top view of the main part showing the self-supporting structure of the walking rice transplanter Longitudinal rear view of the main part showing the suspension support structure of a walking rice transplanter Front view of main parts showing fuel supply structure

Explanation of symbols

5 Transmission case 7 Lower part 6 Propulsion wheel 115 Hydraulic cylinder 116 Piping 117 Piping 119 Upper part (swinging arm)
120 First member (cylinder tube)
121 2nd member 122 1st pivot part 123 2nd pivot part 124 Shaft member 125 Holder member 126 Shaft member 127 Holder member E Operation mechanism F Vehicle body height adjustment mechanism G Swing range change means P1 Left-right axis P2 Left-right direction Axis P3 Left and right axis

Claims (5)

A transmission case that swings up and down with a left-right axis as a fulcrum, and an operating mechanism that swings up and down with the shaft center as a fulcrum within a preset swing range of the transmission case;
From the transmission case and the operation mechanism, a vehicle body height adjusting mechanism for adjusting the height of the vehicle body to ground by changing the height of the propulsion wheel provided at the free end portion of the transmission case is configured. A vehicle body height adjustment structure for a walking work machine,
A vehicle body height adjustment structure for a walking work machine, characterized in that the vehicle body height adjustment mechanism is provided with a rocking range changing means for changing the setting of the rocking range. A swing arm that swings integrally with the transmission case with the shaft center as a fulcrum is connected to the transmission case,
The operating mechanism is configured to perform the swing operation of the transmission case via the swing arm;
The swing range changing means changes the swing range by changing the connecting position of the swing arm with respect to the transmission case in the swing direction of the transmission case with the shaft as a fulcrum. The structure for adjusting the vehicle body height of a walking work machine according to claim 1, characterized in that it is configured. The operation mechanism has a first member mounted on the vehicle body fixing portion via a first pivot portion so as to be swingable about a left-right axis, and a left-right axis as a fulcrum. The second case is installed on the transmission case side through the second pivotal support portion so as to be able to swing, and extends from the vehicle body fixing portion side to the transmission case side along the longitudinal direction of the vehicle body. And the second member is displaced in the erection direction with respect to the first member, so that the swing operation of the transmission case is performed,
The first pivot portion and the second pivot portion are fixed to the vehicle body fixing portion side and the first member, or the shaft member provided on the transmission case side and the second member, and the vehicle body fixing portion. It comprises a holder member provided to be fitted on the shaft member on the other side of the part side and the first member, or on the other side of the transmission case side and the second member,
The shaft member and the holder member of one or both of the first pivot part and the second pivot part are formed to have a larger diameter than the first member or the second member. The vehicle body height adjusting structure for a walking work machine according to claim 1 or 2. The operating mechanism includes a hydraulic cylinder installed over the vehicle body fixing portion side and the transmission case side along the longitudinal direction of the vehicle body,
The structure for adjusting the vehicle body height of a walking work machine according to any one of claims 1 to 3, wherein a pipe is connected to the hydraulic cylinder from above and below the hydraulic cylinder. Adopting a double acting type as the hydraulic cylinder,
One end portion of the cylinder tube in the hydraulic cylinder is connected to a lower portion of the vehicle body fixing portion located below the swing fulcrum of the transmission case, and the other end portion of the cylinder tube is connected to the transmission case. Connect to the upper part of the transmission case located above the swing fulcrum,
The pipe is connected to one end of the cylinder tube from above the hydraulic cylinder, and the pipe is connected to the other end of the cylinder tube from below the hydraulic cylinder. Item 5. A vehicle body height adjustment structure for a walking work machine according to Item 4.

Images