JP5296648B2 - Ride type rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding type farm working machine having a variable interval between right and left front wheels, in which a mission and a front axle are combinedly used so that its manufacturing cost is reduced for the entire machine group. <P>SOLUTION: An interval of right and left front wheels is changed depending on whether a spacer 77 is interposed between a mission case 17 and a front axle unit 20. In the upper end of the front axle unit 20, a first attaching part 82 is fixed to a side frame 9, or a second attaching part 83 is fixed to an overhanging frame 85, depending on whether the spacer 77 is interposed. In the state of the spacer 77 being interposed, an extension shaft 86 arranged in the spacer 77 is connected to a front wheel drive shaft 68 so that power is transmitted from a mission to the front axle unit 20. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a riding type rice planting machine.

  The riding type rice transplanter has a traveling machine body supported by front wheels and rear wheels, and a seedling planting device is attached to the rear part of the traveling machine body so that the height can be adjusted. The traveling machine body is provided with a seat and a steering handle and is equipped with an engine, and traveling and seedling work are performed by power from the engine. The power of the engine is transmitted to a mission (transmission) having a mission case, and the number of revolutions is appropriately adjusted by the mission.

  In addition, passenger rice transplanters generally have a four-wheel drive system in which the front and rear wheels are driven. For this reason, there are a front axle that drives the front wheels and a rear axle that drives the rear wheels. Power is transmitted from the mission to the axle. In general, the mission is positioned between two front axles that drive the left and right front wheels, and front axle cases are attached to the left and right sides of the mission case.

  And in patent document 1, the cylindrical part is provided in the front axle case, and the cylindrical part is being fixed to the transmission case by flange connection.

JP2000-203285A

Here, there are different types of riding type rice transplanters, such as four-row planting, six-row planting, and eight-row planting, which have different intervals between the left and right front wheels. In this case, since there is a considerable difference in required power and size between the 4-row plant and the 8-row plant, the specifications of the mission case and the front axle case must be different. However, for example, when the number of planted strips is close, such as 4-row planting and 6-row planting, the specifications of the transmission case and the front axle case can be made common because there is not much difference in required power and size.
However, conventionally, separate mission cases and front axle cases have been prepared for four-row planting and six-row planting. For this reason, there are problems that the manufacturing cost increases as a whole model group, and because there are many types of parts, the parts inventory of each model cannot be maintained sufficiently and productivity is lowered.

  In this regard, as shown in Patent Document 1, when a cylindrical portion is provided in the front axle case and the cylindrical portion is fixed to the transmission case with a flange connection, the transmission case can be shared even if the left and right front wheels have different intervals. . However, the front axle case still has to be rebuilt and the cost reduction is not enough. In addition, the traveling body is a front-wheel steering type, and a differential mechanism is integrated into the front-wheel drive shaft that transmits power to the front axle. The shafts have the same length and are specially designed. Therefore, although many parts such as gears are common, the entire mission must be manufactured for each model, which hinders cost reduction.

  In view of the above problems, the problem to be solved by the present invention is to promote the sharing of parts of the transmission and front axle device, including the transmission case and the front axle case, in a model in which the distance between the left and right front wheels is different. The production cost of the entire group is to be reduced.

The riding type rice transplanter according to the present invention includes a travel machine body that is supported by left and right front wheels and a rear wheel and has an engine mounted thereon, and a work device that is disposed behind the travel machine body. And a left and right front axle device that transmits the power adjusted by the transmission to the left and right front wheels. The transmission has a mission case, and each of the left and right front axle devices has a transmission case. It has a front axle case, and the transmission case is disposed between the left and right front axle cases.

  The present invention has a multifaceted spread under the above basic configuration. Among these, in the first invention (invention of claim 1), the front axle case is formed with a flange portion that overlaps the transmission case and can be fastened with a bolt, and the transmission case is provided with the front axle case. Direct fastening of the flange portion or fastening of a spacer to the transmission case and fastening of the flange portion of the front axle case to the spacer can be selected.

A longitudinal longitudinal side frame disposed on the left and right outer sides of the transmission case; a longitudinal longitudinal auxiliary frame disposed on the lateral left and right sides of the side frame; and a vehicle body cover supported by the side frames and the auxiliary frame. In the state where the front axle case is directly fastened to the transmission case, the front wheel is located between the side frame and the auxiliary frame, and in the state where the spacer is interposed, the front wheel is Ru set Tei so as to be located on the left and right outer side of the auxiliary frame and the body cover.

A second invention (invention of claim 2 ) is a development of the first invention. In this invention, the transmission case has front and rear longitudinal side frames arranged on the left and right outer sides of the transmission case, and the front An upper end portion of the axle case includes a first attachment portion that can be fixed to the side frame, and a second attachment portion that can be fixed to an extension frame provided to protrude from the side frame to the left and right sides, When the axle case is directly fastened to the transmission case, the first attachment portion is fixed to the side frame, and when the spacer is interposed, the second attachment portion is fixed to the projecting frame.

  In each invention of the present application, the distance between the left and right front wheels is changed by selecting whether the front axle case is fastened directly to the transmission case or via the spacer. That is, it is possible to configure a model in which the distance between the left and right front wheels is different by sharing the transmission case and the front axle case. As a result, it is not necessary to manufacture a mission and a front axle case for each model, and the manufacturing cost can be reduced as a whole model group. In addition, since many common parts can be stocked, it is possible to suppress a decrease in productivity due to a shortage of parts stock when changing models.

Employing first invention, in a state of being interposed spacer, front wheel wear in easily visible front wheels so located outside the vehicle body cover. For this reason, it is easy to check the posture when, for example, a step board is used for loading and unloading on a track.

When the front axle case is attached to the transmission case in a cantilevered state, a large moment acts on the attachment portion of the front axle case. Therefore, conventionally, the upper end portion of the front axle case is fixed to the frame or the like to prevent the moment from acting on the front axle case. When the second invention is adopted, the upper end portion of the front axle case is fixed to the side frame. Or since it is fixed to the overhanging frame, it is possible to prevent the moment from acting on the front axle case as in the prior art. According to a fourth aspect of the present invention, the first mounting portion and the second mounting portion are provided in advance in the front axle case, and the first mounting portion is fixed to the side frame when the front axle case is directly fastened to the transmission case. In the state where the spacer is interposed, the second mounting portion is fixed to the overhanging frame. Therefore, when the front axle case is shared by a plurality of models having different distances between the left and right front wheels, The front axle case can be supported from above in an appropriate state while ensuring design freedom.

It is a side view of a rice transplanter. It is a top view of a 4 row planting rice transplanter. It is a perspective view which shows the framework of a traveling machine body. It is a top view which shows the state which removed the upper member from the vehicle body cover of the traveling machine body for 4 row planting. It is a top view of the traveling machine body for 4 row planting. It is a front view which shows the principal part of 4 row transplanting rice transplanter. It is a partial isolation | separation perspective view which shows the principal part of the 4-row transplanting rice transplanter. It is a front view internal structure figure of the principal part of 4 row transplanting rice transplanter. It is a top view of the main elements which show a power system. It is a top view which shows the state which removed the upper member from the vehicle body cover of the traveling machine body for 6-row planting. It is a top view of the traveling machine body for 6 row planting. It is a front view which shows the principal part of a 6-row planting rice transplanter. It is a partial separation perspective view showing an important section of a 6-row transplanting rice transplanter. It is a front view internal structure figure of the principal part of a 6-row transplanting rice transplanter.

  Hereinafter, an embodiment of a riding type agricultural working machine according to the present invention will be described with reference to the drawings. This embodiment is applied to a riding type rice transplanter (hereinafter simply referred to as “rice transplanter”). In the following description, the terms “front and rear” and “left and right” are used to specify the direction. These terms are based on the direction of the driver sitting in the forward direction unless otherwise specified. Is displayed.

(1). Outline of rice transplanter First, the outline of rice transplanter will be explained. As can be easily understood from FIGS. 1 to 3, the rice transplanter has a traveling machine body 1 and a seedling planting device 2 as basic elements, and the seedling planting device 2 is connected to the rear part of the traveling machine body 1 via the link mechanism 3. It is connected to move up and down.

  The traveling machine body 1 is supported by left and right front wheels 4 and rear wheels 5, and the front wheels 4 and the rear wheels 5 are driven by power. The traveling machine body 1 includes a seat 6 with a backrest on which a driver sits and a steering handle 7 disposed in front of the seat. The seat 6 and the steering handle 7 are disposed at the left and right intermediate positions of the traveling machine body 1. Preliminary seedling stands 8 are arranged in front of the seat 6 and on the left and right sides.

  For example, as can be clearly understood from FIG. 3, the traveling machine body 1 includes left and right side frames 9 extending in the front-rear direction, a front frame 10 in which the left and right side frames 9 are connected at the front end portions, and left and right side frames 9. It has a left and right longitudinal rear frame 11 connected to the rear end. The side frame 9, the front frame 10, and the rear frame 11 constitute a vehicle body frame (chassis) that forms the core of the traveling machine body 1. A bumper 12 is disposed at the front end of the side frame 9, and the rear frame 11 is supported by two left and right rear columns 13.

  The side frame 9 is bent so that the front half is in a substantially horizontal posture and the rear half is in a back-tilt posture with a substantially front-rear intermediate portion as a boundary. That is, the rear half of the side frame 9 is an inclined portion 9a that is inclined upward from the front toward the rear. A plurality of outward branch frames 14 projecting outward in the left and right directions are fixed to the horizontal portion of the side frame 9.

  Further, auxiliary frames 15 extending in the front-rear direction are arranged in parallel on the left and right sides of the side frame 9, and the auxiliary frame 15 is welded to the outward branch frame 14 and the rear frame 11. Accordingly, the rear frame 11 protrudes (protrudes) to the left and right outside of the side frame 9. As shown in FIG. 2, in the 4-row rice transplanter, the front wheel 4 and the rear wheel 5 are located between the side frame 9 and the auxiliary frame 15 in a plan view.

  For example, as can be understood from FIG. 1, the engine 16 is disposed in a portion of the side frame 9 positioned below the inclined portion 9 a in a side view, and a gear is disposed in front of the engine 16 and at a position lower than the side frame 9. A mission case 17 containing a group is arranged. The engine 16 is arranged such that the crankshaft 18 extends in the left-right direction, and power is transmitted to the inside of the transmission case 17 by a pulley and a belt 19.

  A front axle device 20 is attached to the left and right side surfaces of the front portion of the transmission case 17, and the front wheel 4 is rotatably supported via the front axle device 20. For example, as shown in FIGS. 6 and 7, the front axle device 20 includes a front axle case including an upper front axle case 20a and a lower front axle case 20b that is suspended from the upper front axle case 20a so as to be horizontally rotatable. A flange portion 20c provided on the upper front axle case 20a is fastened to the transmission case 17, and the front wheel 4 is supported on a front axle 21 that protrudes left and right outward from the lower front axle case 20b.

  For example, as can be understood from FIG. 4, the engine 16 is disposed at a position along the longitudinal center line of the traveling machine body 1 (that is, the left and right intermediate portion of the traveling machine body 1). For example, as shown in FIG. 1, the engine 16 is disposed in a posture in which the crankshaft 18 is positioned in front and the cylinder bore is inclined backward.

  The seat 6 is positioned at a substantially left-right intermediate portion of the traveling machine body 1 and generally above the front half of the inclined portion 9a in the side frame 9 in a side view. As can be understood from FIG. 1, the front portion of the engine 16 overlaps with the seat 6 in plan view, and the engine 16 protrudes greatly behind the seat 6 in plan view and side view. A fuel tank 22 is disposed between the seat 6 and the engine 16. A fertilizer application device 23 is arranged behind the seat 6 as shown in FIG.

  A rear axle case 25 is disposed behind the transmission case 17 and obliquely behind the engine 16, and the rear wheel 5 is attached to a rear axle 26 that protrudes left and right outward from the rear axle case 25. An auxiliary wheel 27 may be attached to the rear axle 26. Drive power is transmitted from the transmission case 17 to the interior of the rear axle case 25 by the traveling drive shaft 28.

  For example, as can be understood from FIG. 1 and FIG. 3, the top link 30 is connected to the rear frame 11, and the lower link 31 is connected to the left and right rear columns 13. It is connected to the link 31. The top link 30 and the lower link 31 are driven by a hydraulic cylinder 32, whereby the seedling planting device 2 is moved up and down.

  As shown in FIG. 5, the portion of the traveling machine body 1 on which a person rides is covered with an integral body cover 33. The vehicle body cover 33 is supported by the side frame 9, the front frame 10, the branch frame 14, the auxiliary frame 15 and the like described above. A grating-shaped window hole 33 a is provided in a portion of the vehicle body cover 33 positioned between the side frame 9 and the auxiliary frame 15. Therefore, in the four-row transplanting rice transplanter, a person sitting on the seat 6 can visually recognize the front wheel 4 from the window hole 33a.

  When the steering handle 7 is rotated, the front wheels 4 are horizontally rotated via the power steering unit 34 and the like, thereby changing the traveling direction of the traveling machine body 1. For example, as shown in FIG. 1, the power steering unit 34 is disposed below a handle post 35 in which the handle shaft of the steering handle 7 is built, and the handle shaft is coupled thereto. A steering arm 36 is rotatably provided at the lower end of the power steering unit 34, and one end of two left and right steering rods 37 is connected to the steering arm 36 as shown in FIG. The other end of the steering rod 37 is connected to a front wheel arm 38 provided in the lower front axle case 20 b of the front axle device 20.

  As can be understood from FIGS. 1 and 2, the seedling planting device 2 includes a planting arm 41 including a rotary planting device, a seedling mounting table 42 having four belts, a float 43, a leveling rotor 44, and the like. . Two planting devices form a set and are rotatably mounted on the left and right ends of the planting arm 41. Since FIG. 2 is a four-row planting rice transplanter, there are four planting devices, that is, two planting arms 41, and three planting arms 41 for six and eight planting. Four.

(2). Engine and power system As described above, the mission case 17 is disposed in front of the engine 16. For example, as can be understood from FIGS. 1 and 9, the transmission case 17 and the rear axle case 25 are connected by a joint member 45 made of a square pipe, and the engine 16 is supported by the joint member 45 and the rear axle case 25. Has been.

  For example, as can be understood from FIG. 9, the mission case 17 has a long shape in the front-rear direction. Roughly speaking, the two shell structures on the left and right are stacked and tightened together with a bolt group to form a hollow structure. Yes. A left convex portion 46 having a rectangular cross section projecting to the left and a right convex portion 47 having a rectangular cross section projecting to the right are formed on the front portion of the mission case 17, respectively. A front axle case 20a is fastened with a front axle mounting bolt 48 at a flange portion 20c. The flange portion 20c has the same rectangular shape as the end surfaces of the left and right convex portions 46 and 47.

Ribs 49 having a substantially circular cross section are formed at the four corners of the left convex portion 46, that is, at the portion where the bolt 48 is fastened. As shown in FIGS. 6 and 7, the rib 49 is disposed from the end surface of the left convex portion 46 to which the upper front axle case 20a is attached to the base of the left convex portion 46, and from the base of the left convex portion 46 to the end surface. It has a tapered shape that narrows toward it. A tap hole is formed at the tip of the rib 49, and the front axle mounting bolt 48 is screwed into this to fasten the front axle device 20. Thereby, even if it is the mission case 17 formed with a casting, high intensity | strength is obtained.
Similarly, ribs 50 having a substantially circular cross section are formed at the four corners of the right convex portion 47 from the base to the tip. A tapped hole is formed at the tip of the rib 50, and the front axle mounting bolt 48 is screwed to this to fasten the front axle case 20.

  As shown in FIG. 7, the first spigot recess 51 is formed on the mounting surface of the transmission case 17, and the first first spigot protrusion 52 that fits into the first spigot recess 51 is formed on the flange portion 20 c of the upper front axle case 20 a. Is formed. As a result, when the front axle device 20 is attached to the transmission case 17, the first spigot protrusion 52 can be easily positioned by inserting the first spigot protrusion 52 into the first spigot recess 51, and the attachment strength is increased. In addition, an O-ring 53 is attached to the first spigot convex portion 52, and the fitting portion between the first spigot concave portion 51 and the first spigot convex portion 52 is sealed, so that the transmission case 17 and the front axle device 20 Prevents oil leaks, rainwater and muddy water from entering.

  An HST (hydrostatic continuously variable transmission) 55 is attached to the left side surface of the middle portion of the transmission case 17 in the front-rear direction, and the power from the engine 16 is transmitted to the input shaft 56 of the HST 55 by the belt 19 described above. The A hydraulic pump 57 driven by the input shaft 56 of the HST 55 is attached to the left side surface of the middle part of the mission case 17 in the front-rear direction. The aforementioned hydraulic cylinder 40 and power steering unit 34 are driven by the pressure oil from the hydraulic pump 57. A work power output unit 58 projects from the right side of the rear part of the mission case 17. An inter-strain adjustment device 59 is disposed behind the work power output unit 58. From the inter-strain adjustment device 59, a planting shaft (PTO shaft) 60 for driving the seedling planting device 2 protrudes backward, A fertilization drive shaft 61 that drives the fertilizer application 23 protrudes upward. The inter-strain adjustment device 59 is fixed to the rear axle case 25 and the joint member 45.

  8, the internal structure of the mission case 17 and the front axle device 20 is viewed from the front. The power input from the input shaft 56 is speed-adjusted by the HST 55 and the planetary gear mechanism 62 and is output to a first rotation shaft (not shown) located inside the hollow second rotation shaft 63. Further, power is transmitted from the first rotation shaft to the second rotation shaft 63 via the clutch 64 and is transmitted to the third rotation shaft 67 via the transmission gear groups 65 and 66. By sliding the transmission gear group 65 provided on the second rotation shaft 63 or the transmission gear group 66 provided on the third rotation shaft 67, high speed traveling during road traveling, low speed traveling during seedling work, and stopping Switching between neutral and reverse is performed.

  Power is transmitted from the third rotating shaft 67 to the front wheel drive shaft 68. The front wheel drive shaft 68 includes a right front wheel drive shaft 68a for driving the right front wheel 4 and a left front wheel drive shaft 68b for driving the left front wheel 4. A differential case 69 to which the differential gear 69 and the differential gear 69 are fixed is incorporated as a differential mechanism. Yes. A spur gear (not shown) fixed to the third rotating shaft 67 meshes with the differential gear 69. The number of rotations of the right front wheel drive shaft 68a and the left front wheel drive shaft 68b changes (differentiates) according to the rotation angle of the steering handle 7.

  Spline which meshes with the spline formed inside the drive shaft bevel gear 71 built in the upper front axle case 20a is formed at the left and right outer ends of the front wheel drive shafts 68a and 68b, and the front wheel drive shafts 68a and 68b. Is removable with respect to the drive shaft bevel gear 71 and is not rotatable relative to the drive shaft bevel gear 71. The drive shaft bevel gear 71 meshes with a rotation shaft bevel gear 73 that rotates the longitudinal rotation shaft 72 of the front axle device 20. The lower end of the vertically long rotating shaft 72 is a front axle bevel gear 74 that transmits power to the front axle 21. The vertically long rotating shaft 72 is slidable with respect to the front axle bevel gear 73 and is not rotatable relative to the front axle bevel gear 73 and is supported from above by a spring 75, and the spring 75 absorbs the impact received by the front wheel 4 from the road surface.

  A rear wheel drive bevel gear 76 for rotating the traveling axle 28 that transmits the drive to the rear axle case 25 is fitted to the left end of the third rotation shaft 67. The power transmitted from the travel drive shaft 28 is transmitted to the rear axle 26 via the rear axle case 25. The third rotary shaft 67 is provided with a brake 77 at the right end so that the rotation is completely stopped.

(3). Common use of members in different models Although the rice transplanter of this embodiment has been described as a four-row planting rice transplanter, the traveling machine body 1 of this embodiment has the right and left intervals of the front wheels 4 and the rear wheels 5 By changing the distance between the left and right, it can be used for 5-row and 6-row planting. The front wheel 4 and the rear wheel 5 are positioned between the side frame 9 and the auxiliary frame 15 in plan view as described above in the case of four-row planting, and in the case of six-row planting, FIG. As shown in FIG. 11, the auxiliary frame 15 and the vehicle body cover 33 are disposed on the left and right outer sides. By changing the length of the rear axle 26 protruding from the rear axle case 25, the rear wheel 5 can be changed in the left-right distance.

  The left-right distance between the front wheels 4 can be changed depending on how the front axle device 20 is attached. As described above, in the four-row planting, the flange portion 20c of the front axle device 20 is directly fastened to the left and right convex portions 46, 47 of the transmission case 17.

On the other hand, in the case of 6-row planting, as shown in FIGS. 10 and 12, a bottomless cylindrical spacer 78 having an inner flange 78a and an outer flange 78b at both ends is provided between the mission case 17 and the front axle device 20. The space between the left and right front wheels 4 is widened by interposing.
The inner flange 78a of the spacer 78 is fastened to the end surfaces of the left and right projections 46, 47 of the mission case 17 with a spacer mounting bolt 79, and the flange 20c of the front axle device 20 is connected to the outer flange 78b of the spacer 78 with the front axle mounting bolt 48. It is concluded with. The inner flange 78a and the outer flange 78b have a rectangular shape so as to overlap the left and right convex portions 47, 48 and the flange portion 20c, and through holes are provided in the four corners of the inner flange 78a, and taps are provided in the four corners of the outer flange 78b. A hole is formed. The spacer mounting bolt 79 is screwed into the tap hole of the ribs 49 and 50, and the front axle mounting bolt 48 is screwed into the tap hole of the flange 78b.

  The inner flange 78a of the spacer 78 has a second spigot projection 80 fitted to the first spigot recess 51 of the left and right projections 46, 47 of the transmission case 17, and the outer flange 78b has a flange of the upper front axle case 20a. A second spigot recess 81 that fits with the first spigot protrusion 52 of the portion 20c is formed. Thus, when the spacer 78 is attached to the transmission case 17, the second spigot projection 80 can be easily positioned by inserting it into the first spigot recess 51. When the front axle device 20 is attached to the spacer 78, the first spigot projection 52 can be easily positioned by inserting it into the second spigot recess 81. Moreover, since it fits in the inlay part, attachment strength increases.

  An O-ring 82 is attached to the second spigot projection 80 to seal the fitting portion between the first spigot recess 51 and the second spigot projection 80. The fitting portion between the first spigot convex portion 52 and the second spigot concave portion 81 is sealed with an O-ring 53. As a result, oil leakage from the mission case 17, the spacer 78, and the front axle device 20, and intrusion of rainwater and muddy water are prevented.

  A protrusion 78c extending over the entire length is formed on the side surface of the cylindrical portion of the spacer 78, and a bracing 78d is formed at the corner portion formed by the side surface of the cylindrical portion and the inner flanges 78a and 78b. Is secured.

  As described above, the differential gear 69 and the differential case 70 are integrated into the front wheel drive shaft 68 as a differential mechanism (FIG. 8). In the four-row transplanting rice transplanter, as shown in FIGS. 7 and 8, a drive shaft bevel gear 71 incorporated in the upper front axle case 20a is inserted at the outer end of the front wheel drive shaft 68 in the left-right direction. Power is transmitted directly from the front wheel drive shaft 68 to the device 20.

  On the other hand, in the six-row transplanting rice transplanter, as shown in FIGS. 13 and 14, an extension shaft 86 disposed in the spacer 78 is connected to the front end of the front wheel drive shaft 68 in the left-right direction by a coupling 87. The front wheel drive shafts 68a and 68b and the coupling 87, and the coupling 87 and the extension shaft 86 are relatively unrotatable by splines. That is, the extension shaft 86 is not rotatable relative to the front wheel drive shafts 68a and 68b. The front wheel drive shafts 68a and 68b and the coupling 87, and the coupling 87 and the extension shaft 86 are detachable. The portions of the front wheel drive shafts 68a and 68b where the splines are formed at the outer ends in the left and right direction and the inner ends of the extension shafts 86 are formed from the respective tips to a predetermined length (for example, about half of the coupling 87). Misalignment of the ring 87 is prevented. The coupling 87 and the extension shaft 86 may be welded. A spline that meshes with a spline formed inside the drive shaft bevel gear 71 built in the upper front axle case 20 a is formed at the outer end in the left-right direction of the extension shaft 86. The extension shaft 86 is connected to the drive shaft bevel gear 71. On the other hand, it is insertable / removable and cannot be rotated relative to it. Accordingly, power is transmitted from the front wheel drive shaft 68 to the front axle device 20 via the extension shaft 86.

  A first mounting portion 88 located on the outer side in the left-right direction and a second mounting portion 89 located on the inner side in the left-right direction are provided at the upper end of the upper front axle case 20a. Each of the first mounting portion 88 and the second mounting portion 89 is a bottomless cylindrical shape whose bottom surface is positioned in the front-rear direction, and the first mounting portion 88 is formed at a position slightly lower than the second mounting portion 89.

In the four-row transplanting rice transplanter, as shown in FIG. 6, a bracket 90 in which the upper front axle case 20 a is directly fastened to the mission case 17 by the flange portion 20 c and the first attachment portion 88 is attached to the lower side of the side frame 9. It is fixed using.
As shown in FIGS. 6 and 9, the bracket 90 has a U shape in which the upper end is attached to the lower surface of the side frame 9 and the left and right inner sides are opened in a bottom view. The front and rear side plates of the bracket 90 are provided with holes through which the first mounting portion support bolts 84a are inserted. The first mounting portion support bolts 84a are inserted into the front and rear side plates of the bracket 90 from the front and rear. The upper front axle case 20a is supported and fixed to the left and right inner sides of the side frame 9 by being inserted into the mounting portion 88 and fastened with a nut.

In the six-row planting rice transplanter, as shown in FIG. 12, the upper front axle case 20a is fastened to the mission case 17 via the spacer 78, and the second mounting portion 89 projects from the side frame 9 to the left and right outer sides. It is fixed to the exit frame 91.
As shown in FIGS. 12 and 16, the overhanging frame 91 has a U-shape with the bottom opened in a side view, and the left and right inner ends are attached to the outer side surface of the side frame 9. The upper surface of the overhanging frame 91 is located at substantially the same height as the upper surface of the side frame 9. The left and right ends of the front and rear side plates of the overhang frame 91 are provided with holes through which the second mounting portion support bolts 85a are inserted, and the second mounting portion 89 is sandwiched from the front and rear by the front and rear side plates of the overhang frame 91. The upper front axle case 20a is supported and fixed to the left and right outer sides of the overhanging frame 91 by inserting the mounting portion supporting bolts 85a through the second mounting portions 89 and fastening them with nuts.

(4) Summary As can be understood from the above description, the front axle device 20 is directly fastened to the transmission case 17 and power is directly transmitted from the transmission to the front axle device 20 or is fastened via the spacer 78 and the extension shaft 86 is fastened. Since the left and right distances of the front wheels 4 are changed depending on whether power is transmitted through the 4-wheel transplanting rice transplanter and the 6-row transplanting rice transplanter, the mission and the front axle device 20 can be shared as they are. Further, since the first mounting portion 88 and the second mounting portion 89 are provided at the upper end portion of the upper front axle case 20a, even if the bracket 90 and the overhanging frame 91 are different in height and shape, four rows are planted. It is not necessary to remake the upper front axle case 20a between the rice transplanter and the 6-row transplanter. Furthermore, in the case of a six-row transplanting rice transplanter that fastens the front axle device 20 via the spacer 78, an extension shaft 86 is connected to the front end of the front wheel drive shaft 68 to cope with an increase in the left-right distance of the front wheel 4. The front wheel drive shaft 68 in which the differential gear 69 is integrated is also shared with that of the four-row planting rice transplanter, so there is no need to redesign the mission for each model having a different number of planting strips.

  In the present embodiment, the rice transplanter corresponding to 4-6 strip planting is used. However, the present invention is not limited to this. For example, if the output of the engine and the strength of the traveling machine are within the allowable range, It can be applied to a rice transplanter corresponding to up to 8 plants. Moreover, it is applicable not only to a rice transplanter but also to other agricultural machines such as a vegetable seedling transplanter.

Industrial article availability

  As described above, the present invention can be embodied in a riding-type farm work machine such as a rice transplanter and can exhibit high utility. Therefore, it has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Seedling planting device 4 Front wheel 5 Rear wheel 9 Side frame 15 Auxiliary frame 16 Engine 17 Transmission case 20 Front axle device 20a Upper front axle case 20b Lower front axle case 20c Flange part 33 Vehicle body cover 33a Window hole 68 Front wheel drive shaft 69 differential gear 70 differential case 78 spacer 86 extension shaft 88 first mounting portion 89 second mounting portion 91 projecting frame

Claims (2)

A traveling machine body supported by left and right front wheels and rear wheels and mounted with an engine, and a working device disposed behind the traveling machine body,
A transmission for adjusting the power of the engine, and a left and right front axle device for transmitting the power adjusted by the transmission to the left and right front wheels,
The mission has a mission case, the left and right front axle devices each have a front axle case, and the mission case is a riding type rice transplanter disposed between the left and right front axle cases,
The front axle case is formed with a flange portion that can be fastened with a bolt overlapping the transmission case,
And entering into the flange portion of the front axle case to the transmission case directly state, and are a selectable entering into the flange portion of the front axle case to the spacer by fastening a spacer to the transmission case,
A longitudinal longitudinal side frame disposed on the left and right outer sides of the mission case, a longitudinal longitudinal auxiliary frame disposed on the left and right outer sides of the side frame, and a vehicle body cover supported by the side frame and the auxiliary frame. And
In the state where the front axle case is directly fastened to the transmission case, the front wheel is located between the side frame and the auxiliary frame,
In the state where the spacer is interposed, the front wheel is set to be positioned on the left and right outer sides of the auxiliary frame and the vehicle body cover.
Riding type rice transplanter . It has longitudinal longitudinal side frames arranged on the left and right outside of the mission case,
At the upper end of the front axle case,
A first mounting portion that can be fixed to the side frame;
A second mounting portion that can be fixed to an overhanging frame provided to protrude from the side frame to the left and right sides;
In a state where the front axle case is directly fastened to the transmission case, the first mounting portion is fixed to the side frame,
The riding type rice transplanter according to claim 1, wherein the second mounting portion is fixed to the projecting frame in a state where the spacer is interposed .

Images