JP3776006B2 - Ride type paddy field work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a body structure in a four-wheel drive type paddy field work vehicle such as a riding type rice transplanter or a riding type direct seeder.
[0002]
[Prior art]
  In a riding paddy field machine such as a riding rice transplanter, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-4610, a body frame extending in the front-rear direction (18 in FIGS. 1, 4 and 6 of the publication). , 23) is arranged at the bottom, and a transmission case (4 in FIGS. 1 and 8 of the above publication) supporting a front wheel that can be steered is connected to the front part of the fuselage frame, and a rear wheel support case ( 1 and FIG. 8 of the above publication are supported by the rear part of the body frame so as to be freely rollable (around the axis in the front-rear direction).
[0003]
  In this case, a support member (25 in FIGS. 1 and 6 in the publication) is fixed to the rear upper part of the body frame, and links (8a and 8b in FIGS. 1 and 6 in the publication) that can swing up and down are provided. In addition, the working member (9 in FIG. 1 of the above-mentioned publication) is connected to the rear part of the link, extending backward in preparation for the support member.
  As a result, the engine power is transmitted to the front wheels via a transmission system disposed inside the transmission case, and the engine power is transmitted from the transmission case via the transmission shaft (24 in FIGS. 1 and 8 of the publication). Is transmitted to the rear axle case and the rear wheel.
[0004]
[Problems to be solved by the invention]
  As described in the prior art, means for connecting a front transmission case and a rear rear axle case by a body frame to form a body structure is suitable for a relatively large model.
[0005]
  In this case, if the above-mentioned means is applied to a relatively small model, the length of the fuselage frame is set to be short so that the front transmission case and the rear rear axle case are brought close to each other. It will be configured. However, in a relatively small model that requires cost reduction with a simple configuration, it is difficult to simplify the body structure with the above-described means.
  An object of the present invention is to simplify the structure of a body in a relatively small model of a riding paddy field work vehicle.
[0006]
[Means for Solving the Problems]
[I]
  Claim 1 (Claim 2)According to the features, the front wheel that can be steered is supported on the front of the mission case,The rear wheel is supported by the rear of the transmission case via the transmission case,The airframe structure is configured, and the engine power is transmitted to the front wheels and the rear wheels via a transmission system arranged inside the transmission case (and inside the transmission case).
[0007]
  ThisClaim 1 (Claim 2)According to the characteristics, by modifying the transmission case which is an existing structure, it is possible to omit the body frame like the structure described in Japanese Patent Laid-Open No. 2000-4610 (refer to the prior art). (Even if equipped with a fuselage frame, a small one is sufficient).
[0008]
[II]
  Claim 1 (Claim 2)According to the features after the mission casePartThe support member is fixed, and a link that can swing up and down is provided on the support member and extends rearward, and the work device is connected to the rear portion of the link. ThisClaim 1 (Claim 2)According to the features after the mission case with sufficient strengthPartThe working device is supported via the support member and the link, and the working device can be supported with sufficient strength.
[0009]
[0010]
[III]
  Claim 1 (Claim 2)According to the features, the left and right axis around the rear of the mission caseToA moving case is provided so as to be swingable up and down independently, extending rearward, and rear wheels are supported on the rear portions of the right and left transmission cases. In this way, by extending the right and left transmission cases supporting the rear wheels to the rear, it is possible to easily construct a body structure having a long wheel base.
[0011]
[IV]
  As described in the prior art, when a rear axle case having right and left rear wheels is supported on the rear part of the body frame so as to be able to roll freely (around the axis in the front-rear direction), for example, the right side rises and the left side When the rear axle case rolls to descend, the right rear wheel ground point moves to the right outside, the right rear wheel tilts to the left inside, and the left rear wheel ground point moves to the right inside The left rear wheel is inclined to the left outer side. For example, when both the right and left rear wheels ride on the convex portion of the work site, the entire rear axle case is raised, and the riding paddy field work vehicle is lifted.
[0012]
  Claim 1 (Claim 2)According to the features, the right and left transmission cases are supported independently around the axis in the left-right direction so that they can swing up and down independently, and the right and left transmission cases are extended rearward. The rear has right and left rear wheels.
  ThisClaim 1 (Claim 2)According to the feature, the right and left transmission cases swing up and down independently around the axis in the left and right direction, so that the right and left rear wheels move up and down. For example, the right transmission case (Right rear wheel) swings upward, and the left transmission case (left rear wheel) swings downward, so that the unevenness of the work area becomes right and left transmission case (right and left This is absorbed by the rear wheels), and the lateral tilt of the riding paddy field work vehicle is suppressed.
[0013]
  Claim 1 (Claim 2)Since the right and left transmission cases swing up and down around the left and right axis instead of the front and rear axis, the right and left transmission cases The ground contact point of the rear wheels does not move to the right and left inner sides and right and left outer sides, and the state where the right and left rear wheels tilt to the right and left inner sides, right and left outer sides does not occur. As a result, the power of the right and left rear wheels can be transmitted to the work site (the contact points of the right and left rear wheels) without waste without being affected by the unevenness of the work site.
[0014]
  Claim 1 (Claim 2)Since the right and left transmission cases swing up and down independently around the left and right axial cores, for example, even if both the right and left rear wheels ride on the convex part of the work site, the right and left As the transmission case (right and left rear wheels) swings upward, the state where both the right and left rear wheels ride on the convex portion of the work area is absorbed. The state of being lifted is suppressed.
[V]
  According to the feature of claim 3, as in the case of claim 1 or 2, the "action" described in the preceding paragraphs [I] to [IV] is provided, and in addition to this, the following "action" is provided. ing.
  Since the right and left bosses at the rear part of the mission case are located at positions relatively separated from each other in the left and right directions, as in the feature of claim 3, when the support members are fixed to the right and left boss parts at the rear part of the mission case, The support member is stably fixed in the left-right direction.
[0015]
[VI]
  According to the feature of claim 4, as in the case of any one of claims 1-3,[V]In addition to this, the following “action” is provided.
  According to the features of claim 4AndSince the driver's seat is provided on the support member that supports the work device via the link mechanism, and the support member is also used as the support frame that supports the driver's seat, a dedicated support frame that supports the driver's seat is unnecessary. (Even if a support frame for supporting the driver's seat is provided, a small frame can be used).
[0016]
[VII]
  According to the feature of claim 5, as in the case of any one of claims 1 to 4, the preceding [I] to[VI]In addition to this, the following “action” is provided.
  According to the feature of claim 5, the battery is provided in the support member that supports the working device via the link mechanism, and the support member is also used as the support frame that supports the battery. No support frame is required (even if a support frame for supporting the battery is provided, a small-scale one may be used).
[0017]
[VIII]
  According to the feature of claim 6, as in the case of any one of claims 1 to 3, the preceding [I] to[V]In addition to this, the following “action” is provided.
  According to the feature of claim 6, as in the case of claims 4 and 5, the support member that supports the work device via the link mechanism is provided with the driver seat and the battery, and the support member supports the driver seat and the battery. Therefore, a dedicated support frame for supporting the driver's seat and the battery becomes unnecessary (even if a support frame for supporting the driver's seat and the battery is provided, a small-sized one can be used).
[0018]
  According to the features of claim 6, the driver's seat is provided above the battery, and the driver's seat is configured to be freely changeable between a sitting posture covering the upper portion of the battery and a non-sitting posture opening the upper portion of the battery. When the driver's seat is changed to the non-sitting posture, the upper part of the battery is opened, and maintenance work such as battery replacement can be easily performed.
  When performing maintenance work such as battery replacement as described above, if the driver's seat is changed to the non-sitting position, the negative terminal of the battery is automatically set to the open state, so the driver's seat is set to the non-sitting position. After that, the operator does not need to set the negative terminal side of the battery to the open state by hand.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
[1]
  1 and 2 show a riding type rice transplanter as an example of a riding type work vehicle. First, a support structure for the right and left front wheels 4 and a support structure for the right and left rear wheels 6 will be described.
  As shown in FIGS. 3 and 4, the transmission case 1 is arranged in the front left and right center CL so as to extend in the front-rear direction, and the front wheels are supported on the right and left lateral sides of the front lower portion of the transmission case 1. The case 2 is connected and extends right and left (the front wheel support case 2 does not move up and down with respect to the transmission case 1). A support case 3 is rotatably supported around a longitudinal axis P1 at the end of the front wheel support case 2, and right and left front wheels 4 are supported by the support case 3, and the right and left front wheels 4 are support cases. 3 is configured to be steered right and left around the vertical axis P1.
[0020]
  As shown in FIGS. 3 and 4, boss portions 1 a are formed on the right and left lateral sides of the rear end of the transmission case 1 so as to protrude right and left lateral sides. However, it is supported so that it can swing up and down independently around the axis P2 in the left-right direction of the boss 1a. The right and left transmission cases 5 extend rearward from the boss 1a, and the right and left rear wheels 6 are supported at the rear of the right and left transmission cases 5, and the right and left rear wheels 6 are The steering operation is not performed.
[0021]
  As shown in FIGS. 3 and 5, a support frame 7 formed by bending a flat plate into a box shape is connected to the right and left boss portions 1 a, and brackets 7 a are fixed to the left and right of the rear upper end of the support frame 7. One support shaft 8 is installed over the right and left brackets 7a. In this case, the lateral width of the support frame 7 is narrower than the distance between the right and left transmission cases 5. Suspension springs 9 are attached across the right and left transmission cases 5 and the right and left ends of the support shaft 8. As shown in FIGS. 3 and 4, right and left torsion bars 10 bent in a crank shape in plan view are provided, and one end of the torsion bar 10 is connected to the rear part of the transmission case 1 so as not to rotate. The other end of the torsion bar 10 is attached to the right and left transmission cases 5.
[0022]
  As a result, the load applied to the right and left rear wheels 6 is mainly supported by the suspension spring 9. When the right and left transmission cases 5 swing upward, the elastic resistance of the suspension spring 9 is increased to the right. In addition to being applied to the left transmission case 5, a portion of the torsion bar 10 fixed to the transmission case 1 is twisted, and the elastic resistance of the torsion bar 10 is applied to the right and left transmission cases 5. When a force to displace the right and left transmission cases 5 in the left-right direction is applied, the torsion bar 10 suppresses the displacement of the right and left transmission cases 5 in the left-right direction.
[0023]
  As shown in FIG. 1, one mat-like seedling is placed on each of four seedling placing surfaces of a seedling placing stand 51 of a seedling planting device 41 described later, and one driver is placed on a driver seat 59 described later. The seated state is the normal state, and the suspension spring 9 and the torsion bar 10 are set so that the right and left step portions 30 and the floor 31 described later are substantially horizontal in the above-described normal state.
[0024]
  In the state where the right and left front wheels 4 are set to the straight traveling position in the normal state described above, as shown in FIG. 3, the axle 4a and the boss portion 1a (the axis P2 in the left-right direction) of the right and left front wheels 4 ) And the distance L2 in the front-rear direction between the axle 6a of the right and left rear wheels 6 and the boss 1a (left and right axis P2) is larger than the distance L1 in the front-rear direction. As shown in FIGS. 1 and 4To the rightThe distance L2 in the front-rear direction between the axle 6a of the left rear wheel 6 and the boss 1a (left-right axial core P2) is larger than the outer diameter of the right and left rear wheels 6.
[0025]
[2]
  Next, the structure near the engine 16 and the hydrostatic continuously variable transmission 11 will be described.
  As shown in FIGS. 1 and 7, the hydrostatic continuously variable transmission 11 is connected to the left lateral surface of the front upper portion of the transmission case 1 so as to be located on the left side of the left and right center CL. The input shaft 11a and the output shaft 11b of the hydrostatic continuously variable transmission 11 are located at substantially the same height in the left-right direction, and the input shaft 11a of the hydrostatic continuously variable transmission 11 projects leftward. The output shaft 11 b of the hydrostatic continuously variable transmission 11 is located inside the mission case 1. The input shaft 11a of the hydrostatic continuously variable transmission 11 is provided with an input pulley 12 and a cooling fan 13 (see FIG. 6). As a result, the hydrostatic continuously variable transmission 11 is projected forward from the front surface of the transmission case 1, and the front wheel support case is placed on the lower part of the transmission case 1 of the hydrostatic continuously variable transmission 11. 2 is located.
[0026]
  As shown in FIGS. 7 and 8, an engine support frame 14 facing obliquely upward and forward is connected to the front portion of the transmission case 1, and the substantially horizontal engine support base 15 is located slightly to the left of the left and right center CL. Thus, it is connected to the engine support member 14 (see FIG. 4). The crankcase 16a of the engine 16 is supported by the engine support 15 via the anti-vibration rubber 17, the output shaft 16c of the engine 16 protrudes leftward in the left-right direction, and the cylinder 16b of the engine 16 is obliquely rearward and upward It is arranged so as to be inclined. As a result, as shown in FIG. 7, the cylinder 16 b of the engine 16 is positioned diagonally forward and upward of the hydrostatic continuously variable transmission 11. In other words, the hydrostatic continuously variable transmission 11 enters a lateral V-shaped space formed by the cylinder 16b of the engine 16 and the engine support frame 14 in a side view.
[0027]
  As shown in FIGS. 7 and 8, the output pulley 18 is fixed to the output shaft 16 c of the engine 16, and the transmission belt 19 is wound around the output pulley 18 and the input pulley 12. A tension arm 20 is swingably supported around the horizontal axis P3 of the engine support frame 14, a tension pulley 20a is provided at the tip of the tension arm 20, and the tension pulley 20a is pressed against the transmission belt 19. The tension arm 20 is urged clockwise by the spring 21 in FIG.
[0028]
  With the above structure, the power of the engine 16 is transmitted to the hydrostatic continuously variable transmission 11 through the transmission belt 19, and the power of the hydrostatic continuously variable transmission 11 is disposed in the transmission case 1. To a transmission (not shown). The power of the transmission is transmitted from the front wheel differential mechanism (not shown) to the right and left front wheels 4 via a transmission shaft (not shown) disposed inside the front wheel support case 2. The power of the transmission is transmitted to the right and left via a transmission chain (not shown), right and left side clutches (not shown), and a transmission chain (not shown) arranged inside the transmission case 5. It is transmitted to the rear wheel 6.
[0029]
[3]
  Next, the structure of the frame 23 and the rear frame 24 arranged so as to surround the fuel tank 22 and the engine 16 will be described.
  As shown in FIGS. 7, 8, and 9, a fuel tank 22 is provided at the upper part of the engine 16, and a frame 23 that covers the upper side of the fuel tank 22 from the right and left sides of the fuel tank 22 and the engine 16 is provided. Yes. The frame 23 is formed by bending a single round pipe, and the lower portions of the right and left lateral portions 23a of the frame 23 are connected to the front portion of the engine support base 15 and extend in the right and left directions. It extends backward. The right and left lateral portions 23a of the frame 23 extend obliquely rearward and upward from the vicinity of the crankcase 16a and the output pulley 18 of the engine 16, and pass through the right and left lateral sides of the cylinder 16b of the engine 16 and the fuel tank 22. Yes.
[0030]
  As shown in FIGS. 7, 8, and 9, the upper portion 23 b of the frame 23 is constructed over the right and left lateral portions 23 a of the frame 23, and the upper portion 23 b of the frame 23 is located above the fuel tank 22. Is arranged. As shown in FIG. 8, the middle portion of the right and left lateral portions 23 a of the frame 23 is bent to the left and right central sides, and the frame 23 is more than the distance between the lower portions of the right and left lateral portions 23 a of the frame 23. The distance between the upper portions of the right and left lateral portions 23a is narrow.
[0031]
  As shown in FIGS. 7, 8, and 9, a rear frame 24 is provided on the rear side of the fuel tank 22 and the engine 16. The rear frame 24 is configured by bending one round pipe, and the lower portions of the right and left lateral portions 24 a of the rear frame 24 are connected to the upper portion of the transmission case 1 via a bracket 25. The right and left lateral portions 24a of the rear frame 24 extend obliquely forward and upward from the vicinity of the cylinder 16b of the engine 16, and on the rear side of the fuel tank 22, above the right and left lateral portions 24a of the rear frame 24. The upper portion 24b of the rear frame 24 is constructed over the span. The right and left side portions of the fuel tank 22 are connected to the right and left lateral portions 23 a of the frame 23 and the right and left lateral portions 24 a of the rear frame 24.
[0032]
  As shown in FIG. 8, the rear frame 24 is formed so that the interval between the right and left lateral portions 24a of the rear frame 24 is narrower than the interval between the right and left lateral portions 23a of the frame 23. The rear frame 24 is formed such that the position of the upper portion 24b of the rear frame 24 is lower than the position of the upper portion 23b of the frame 23. As shown in FIGS. 7, 8, and 9, a U-shaped bracket 26 is connected to the upper portion 23 b of the frame 23, and the bracket 27 extends between the upper portion 24 b of the rear frame 24 and the bracket 26. It is connected.
[0033]
  As shown in FIGS. 1, 2, and 6, a front bonnet 28 and a rear bonnet 29 that cover the engine 16, the fuel tank 22, the frame 23, and the rear frame 24 are provided. The front bonnet 28 is configured to cover the front part of the crankcase 16 a of the engine 16, the front and upper parts of the fuel tank 22, the vicinity of the upper part 23 b of the frame 23, and the vicinity of the upper part 24 b of the rear frame 24. It is fixed (cannot be removed). The rear bonnet 29 includes the right and left lateral sides of the crankcase 16a and the cylinder 16b of the engine 16, the right and left lateral portions 23a of the frame 23, the right and left lateral portions 24a of the rear frame 24, and the cylinder 16b of the engine 16. The rear side is configured to cover the rear side of the fuel tank 22 and is configured to be detachable from the front bonnet 28.
[0034]
  As shown in FIGS. 1, 2, and 6, a step unit 30 for getting on and off is provided on the right and left lateral sides of the front and rear bonnets 28 and 29, and a floor 31 connected to the right and left step units 30. Are provided on the rear side of the front and rear bonnets 28 and 29. As shown in FIGS. 1, 2, and 4, the arm 85 is connected to the vicinity of the boss 1a on the lateral outer surface of the right and left transmission cases 5 by bolts, and the arm 85 is disposed on the right and left lateral sides. The step part 86 for getting on and off is fixed to the arm 85 by being extended. As a result, as shown in FIGS. 1 and 2, the right and left step portions 86 are located in the vicinity of the laterally outer side of the floor 31 in plan view, and are located slightly below the floor 31 in side view.
[0035]
[4]
  Next, the steering structure of the right and left front wheels 4 will be described.
  As shown in FIGS. 4 and 9, a rack and pinion type steering gear case 32 is connected to the engine support frame 14, and a rod-shaped rack gear 32 a is slidably supported on the steering gear case 32. The rack gear 32 a is disposed below the front and rear bonnets 28 and 29 and the right step portion 30. A linkage rod 33 is connected across the knuckle arm 3a fixed to the left support case 3 and the rack gear 32a, and a linkage rod 34 is connected across the knuckle arms 3a of the right and left support cases 3. ing.
[0036]
  As shown in FIGS. 7, 8, 9, and 10, a U-shaped bracket 35 is swingably supported around the horizontal axis P <b> 4 of the bracket 26, and the steering handle 36 and the steering shaft 37 are attached to the bracket 35. It is supported for free rotation. A universal joint 39 is provided at the position of the horizontal axis P4 below the steering shaft 37, and a fastening bolt 38 capable of fixing the bracket 35 to the bracket 26 at a desired angle is provided on the bracket 26. Yes.
[0037]
  As shown in FIGS. 4, 7, 8, and 9, a pinion gear shaft 32 b that meshes with the rack gear 32 a is provided in the steering gear case 32, and in the front and rear bonnets 28 and 29, the pinion gear shaft 32 b is the engine 16. It arrange | positions so that it may be located in the right side, and is arrange | positioned so that it may be located in the rear side of the right side part 23a of the flame | frame 23. FIG. A universal joint 39 is provided at an upper portion of the pinion gear shaft 32b, and an interlocking shaft 40 is connected across the steering shaft 37 and the universal joint 39 of the pinion gear shaft 32b inside the front and rear bonnets 28 and 29. . As shown in FIGS. 8 and 9NiheiAn L-shaped recess 22 a in a plan view is formed on the right side of the rear portion of the fuel tank 22, and the interlocking shaft 40 is disposed so as to enter the recess 22 a of the fuel tank 22 obliquely.
[0038]
  With the above structure, when the steering handle 36 is rotated, the rotation of the steering handle 36 is transmitted to the pinion gear shaft 32b via the steering shaft 37 and the interlocking shaft 40, and the rack gear 32a is slid to link the connecting rods 33, 34. As a result, the right and left front wheels 1 are steered right and left. In this case, it is possible to change the angle of the steering handle 36 (bracket 35) around the horizontal axis P4 by loosening the tightening bolt 38. By tightening the tightening bolt 38, the steering handle 36 ( The bracket 35) can be fixed at a desired angle.
[0039]
[5]
  Next, the support structure of the seedling planting apparatus 41 and the seedling planting apparatus 41 will be described.
  As shown in FIGS. 1, 2, 3, and 5, one top link 42 is supported on the support shaft 7 so as to be vertically swingable on the support frame 7, and is fixed to the lower end of the rear portion of the support frame 7. The right and left lower links 43 are supported by the bracket 7 b so as to be swingable up and down, and a support member 44 is connected to the rear ends of the top link 42 and the lower link 43. A single-acting lift cylinder 45 is supported on the support shaft 8 so as to be swingable up and down, and a cylinder rod 45a of the lift cylinder 45 is connected to the lower link 43 and the support member via a suspension rubber 46 and a C-shaped connecting member 47. 44.
[0040]
  As shown in FIGS. 1 and 2, a four-row type seedling planting device 41 is connected to a lower portion of a support member 44 so as to be able to roll around a longitudinal axis. The seedling planting device 41 includes a feed case 48 connected to the support member 44, right and left planting transmission cases 49 extending rearward, and planting that is rotationally driven on the right and left sides of the planting transmission case 49. A case 50, a planting arm 50a supported by the planting case 50, a seedling platform 51 provided with four seedling mounting surfaces and driven to reciprocate laterally in the horizontal direction, a grounding float 52 supported so as to freely move up and down, and the like. It is prepared for.
[0041]
  As shown in FIGS. 3 and 4, the PTO shaft 53 extends rearward and passes through the lower part inside the support frame 7 from the position shifted to the right side from the left and right center CL in the upper part of the mission case 1. A universal joint 54 is provided at the end of the PTO shaft 53 in the vicinity of the lower portion between the left bracket 7b and the left bracket 7b. A PTO shaft 55 is connected across the universal joint 54 of the PTO shaft 53 and the universal joint 54 of the input shaft 48a of the feed case 48. As shown in FIG. 2, the right and left lower links 43 are seen in plan view. A PTO shaft 55 is disposed between them. With the structure described above, the power of the transmission case 1 is transmitted to the seedling planting device 41 via the PTO shafts 53 and 55, and the planting arm is moved as the seedling platform 51 is driven to reciprocate laterally. 50a alternately takes out the seedlings from the bottom of the seedling platform 51 and plantes them on the rice field.
[0042]
  As shown in FIGS. 3, 4, and 5, a control valve 56 is attached to the upper part of the mission case 1 between the PTO shaft 53 and the left side portion of the support frame 7. The lifting cylinder 45 is expanded and contracted by the operation, and the seedling planting device 41 is driven to move up and down. A support base 57 is fixed to a portion of the support frame 7 diagonally above and behind the control valve 56, and a battery 58 is mounted on the support base 57 and fixed. As shown in FIGS. A driver seat 59 is attached to the support frame 7.
[0043]
[6]
  Next, the structure of the lifting lever 60 that operates the control valve 56 will be described.
  As shown in FIGS. 10, 11, and 12, a support plate 61 is connected to the right lateral portion 24 a of the rear frame 24, and an operation plate 62 is swingably supported on a support shaft 61 a connected to the support plate 61. The control valve 56 (see FIGS. 3 and 5) and the operation arm 62a of the operation plate 62 are linked via a wire 64. A planting clutch (not shown) capable of transmitting and receiving the power of the engine 16 to the PTO shaft 53 (seedling planting device 41) is disposed inside the mission case 1, and an operation arm 62a of the operation plate 62 is provided. Are connected to each other via a wire 64.
[0044]
  As shown in FIGS. 10, 11, 12, and 14, a support shaft 60a is supported on the operation plate 62 so as to be rotatable around its own axis, and an elevating lever 60 is connected to an end of the support shaft 60a. The support plate 61 is provided with a lever guide 63. The lift lever 60 and the operation plate 62 are moved to the raised position U, the neutral position N, the lowered position D, and the planting position A around the support shaft 61a along the lever guide 63. Can be operated. At the planting position A, the elevating lever 60 can be operated around the axis of the support shaft 60a to the right and left marker positions MR, ML.
[0045]
  In this case, as shown in FIGS. 11 and 12, the ascending position U is arranged on the rear side (driver seat 59 side), and the planting position A (right and left marker positions MR, ML) is arranged on the front side. Yes. As shown in FIG. 11, in a state in which the steering handle 36 (bracket 35) is set at a standard angle, the lowered position D and the planting position A (right) are located on the side near the center of the steering handle 36 in a side view. And a left marker position MR, ML), and a neutral position N is located on the lateral side of the rear portion of the steering handle 36 in a side view.
[0046]
  As shown in FIGS. 11, 12, and 13, a detent arm 65 is swingably supported around the horizontal axis P4 of the support plate 61, and a tension spring 66 is connected across the detent arm 65 and the support shaft 61a. The detent arm 65 is urged upward by the tension spring 66 so that the roller 65a of the detent arm 65 enters the three recesses formed in the outer peripheral portion of the operation plate 62. As a result, when the roller 65a of the detent arm 65 enters the recess of the operation plate 62, the elevating lever 60 and the operation plate 62 are held at the neutral position N, the lowered position D, and the planting position A. A tension spring 67 is connected across the right lateral portion 23 a of the frame 23 and the operation plate 62, and the lifting lever 60 and the operation plate 62 are biased to the raised position U by the tension spring 67.
[0047]
  As shown in FIG. 1 and FIG. 2, markers 69 are provided on the right and left side portions of the seedling planting device 41 for forming an index of the next planting process on the rice field during the traveling of one planting process. Yes. The right and left markers 69 are configured to be freely operated in a working posture for entering the rice field to form an index, and in a retracted posture away from the rice field, and the seedling planting device 41 is driven to rise greatly from the rice field. Then, the right and left markers 69 are operated to the retracted posture, and the right and left markers 69 are held in the retracted posture by the right and left lock mechanisms (not shown). When the right or left lock mechanism is released when the seedling planting device 41 is driven down to the surface, the right or left marker 69 is operated from the retracted position to the working position.
[0048]
  As shown in FIGS. 10, 11, and 12, a fan-shaped operation plate 68 is swingably supported around the support shaft 61 b fixed to the support plate 61 in a front view. An operation plate 68 is connected via right and left wires 70, and a tension spring 71 that biases the operation plate 68 to a neutral position is connected across the operation plate 68 and the support plate 61.
[0049]
  With the above structure, when the elevating lever 60 is operated to the raised position U, hydraulic oil is supplied from the control valve 56 to the elevating cylinder 45, and the elevating cylinder 45 contracts to drive the seedling planting device 41 up. When the elevating lever 60 is operated to the neutral position N, the operation oil supply / discharge operation of the control valve 56 is stopped, the elevating cylinder 45 is stopped, and the seedling planting device 41 is stopped. When the elevating lever 60 is operated to the lowered position D, the hydraulic oil is discharged from the elevating cylinder 45 via the control valve 56, the elevating cylinder 45 is extended, and the seedling planting device 41 is driven downward. In the raised position U, neutral position N, and lowered position D, the planting clutch is operated to the transmission cut-off side, and the right and left markers 69 are held in the retracted posture.
[0050]
  When the elevating lever 60 is operated to the planting position A, the planting clutch is operated to the transmission side and planting of the seedling by the seedling planting device 41 is started, and the seedling planting device 41 is set to a set height from the rice field. Thus, the seedling planting device 41 is automatically driven up and down by the lifting cylinder 45.
  in this caseInAs described in [5] above, the grounding float 52 is supported by the seedling planting device 41 so as to be movable up and down, and the grounding float 52 and the control valve 56 are linked via a wire (not shown). . Thus, when the seedling planting device 41 moves up and down with respect to the grounding float 52 that follows the ground contact with the rice field, the vertical movement of the seedling planting device 41 is transmitted to the control valve 56 by the wire, and the control valve 56 is operated to move up and down. The seedling planting device 41 is automatically driven up and down by the cylinder 45, and the height from the paddy field (grounding float 52) to the seedling planting device 41 is maintained at the set height, so that the seedling planting depth is maintained. Is maintained at the set depth.
[0051]
  As shown in FIG. 13, since the lower end 60b of the lifting lever 60 is engaged with the operation plate 68 at the planting position A, the operation plate 68 is supported when the lifting lever 60 is operated to the right or left marker position MR, ML. The swinging operation is performed around the shaft 61b, the right or left wire 70 is pulled, and the right or left locking mechanism is released. As a result, the right or left marker 69 is operated from the retracted position to the working position.
[0052]
  As described above, when the seedling planting device 41 is driven up to the upper limit, the riding type rice transplanter can be placed on the loading platform of a light truck (not shown). In the state where the seedling planting device 41 is driven up to the upper limit, the height from the ground to the bottom surface of the grounding float 52 is about 800 mm, and the length from the front end of the front bonnet 28 to the rear end of the grounding float 52 Is about 2200 mm.
[0053]
[7]
  NextQuietThe structure of the transmission lever 72 that operates the hydraulic continuously variable transmission 11 will be described.
  As shown in FIGS. 10 and 16, a support bracket 73 is fixed to the left lateral portion 24 a of the rear frame 24, and an operation shaft 74 is rotatably supported around the axis of the support bracket 73. The hydrostatic continuously variable transmission 11 is configured to be capable of stepless shifting to the forward side and the reverse side across the neutral position, and is connected to a trunnion shaft (not shown) that operates the hydrostatic continuously variable transmission 11. The connected operation shaft 75 extends upward. As shown in FIGS. 10 and 15 (A) and (B), the upper portion of the operation shaft 75 is rotatably supported by a bracket 76 fixed to the left lateral portion 24 a of the rear frame 24. The end portion 74 a is bent downward, and the end portion 74 a of the operation shaft 74 is engaged with the arm 75 a fixed to the upper end of the operation shaft 75.
[0054]
  As shown in FIGS. 10 and 16, a fan-shaped operation plate 77 is fixed to the operation shaft 74 in a side view, and a speed change lever 72 is swingably supported around an axis P5 of the operation plate 77 to change the speed. A spring 78 that urges the lever 72 to the right (left side) in FIG. 10 is attached. A large number of recesses are formed on the outer periphery of the operation plate 77, and a plate spring 79 is fixed to the left lateral portion 24 a of the rear frame 24 so that the roller 79 a at the tip of the plate spring 79 enters the recess of the operation plate 77. It is configured.
[0055]
  As shown in FIGS. 10, 16, and 17 (a), a lever guide 80 is fixed to the left lateral portion 24a of the rear frame 24, and a crank-shaped opening formed by the neutral position N1, the forward region F, and the reverse region R. A lever 80 is provided in the lever guide 80, and the transmission lever 72 is inserted into the opening 80 a of the lever guide 80. in this caseIn16 and 17 (a), the forward region F is disposed on the front side, the reverse region R is disposed on the rear side (the driver seat 59 side), and the reverse region R with respect to the forward region F. Is disposed on the steering handle 36 side, and the shift lever 72 is urged by the spring 78 toward the forward movement region F side (downward in FIG. 17A).
[0056]
  As shown in FIGS. 10, 16, and 17 (A), the lever guide 80 has a longitudinal axis P6 around it.,An operation arm 81 is swingably supported, and the operation arm 81 and the detent arm 65 (see FIGS. 11, 12, and 13) are connected via a wire 82. A stopper 83 that stops the operation arm 81 in the posture shown in FIG. 17A is fixed to the lever guide 80, and the limit switch 84 is fixed to the position of the lever guide 80 corresponding to the end of the reverse travel region R. Yes.
[0057]
  The state shown in FIGS. 16 and 17 (a) is a state where the shift lever 72 is operated to the neutral position N1, and the hydrostatic continuously variable transmission 11 is operated to the neutral position and is stopped. When the shift lever 72 is operated from the neutral position N1 to the forward movement region F, as shown in FIGS. 10 and 15 (A) and (B), the hydrostatic continuously variable transmission 11 via the operation shafts 74 and 75. Since the roller 79a of the leaf spring 79 enters the recess of the operation plate 77 even when the release lever 72 is released, the transmission lever 72 is held at a desired position. .
[0058]
  When the speed change lever 72 is operated from the neutral position N1 to the reverse region R in the state shown in FIGS. 16 and 17 (a), the operation arm 81 is moved counterclockwise by the speed change lever 72 as shown in FIG. By swinging, the operation arm 81 contacts the limit switch 84, the wire 82 is pulled by the operation arm 81, and the detent arm 65 shown in FIGS. . As a result, the elevating lever 60 is operated to the ascending position U by the spring 67, and the seedling planting device 41 is largely driven to rise, and a buzzer (not shown) is activated by a signal from the limit switch 81.
[0059]
  When the shift lever 72 is operated from the neutral position N1 to the reverse region R, as shown in FIGS. 10 and 15 (B) and (B), the hydrostatic continuously variable transmission 11 through the operation shafts 74 and 75. Since the roller 79a of the leaf spring 79 enters the concave portion of the operation plate 77 even when the release lever 72 is released, the transmission lever 72 is held at a desired position. .
[0060]
[Another Embodiment of the Invention]
  In the above-mentioned [Embodiment of the invention], the structure of the driver seat 59 and the battery 58 shown in FIGS. 1, 2, and 3 may be configured as shown in FIGS.
  As shown in FIG. 18 (a), the seating posture and the battery covering the upper side of the battery 58 by supporting the driver seat 59 on the support frame 7 so as to be swingable around the horizontal axis P 7 at the front portion of the driver seat 59. The driver's seat 59 is configured to be freely changeable to a non-sitting posture that opens above 58. A connecting portion 59 a that can be connected to and separated from the negative terminal 58 a of the battery 58 is provided on the back surface of the driver seat 59.
[0061]
  As a result, as shown in FIG. 18 (a), when the driver's seat 59 is set to the seated posture, the connecting portion 59a of the driver's seat 59 is connected to the negative terminal 58a of the battery 58 and is brought into an electrically conductive state. As shown in FIG. 18 (b), when the driver's seat 59 is set to the non-sitting posture, the connecting portion 59a of the driver's seat 59 is separated from the minus terminal 58a of the battery 58, and the minus terminal 58a side of the battery 58 is opened. The support base 57 is automatically raised by the spring 57a.
[0062]
  The present invention is not limited to a riding type rice transplanter, but also a riding type direct seeding machine in which a direct seeding device is connected instead of the seedling planting device 41, or a riding type paddy field management machine in which a chemical spraying device is connected instead of the seedling planting device 41. Is also applicable.
[0063]
【The invention's effect】
  Claim 1 (Claim 2)According to the feature, in the riding paddy field work vehicle, the front wheel that can be steered is supported by the front part of the transmission case,The rear wheel is supported by the rear of the transmission case via the transmission caseBy configuring the fuselage structure, it is possible to omit the fuselage frame such as the structure described in Japanese Patent Application Laid-Open No. 2000-4610 (refer to the prior art). Even if it was equipped with a small one), the aircraft structure could be simplified.
[0064]
  Claim 1 (Claim 2)According to the characteristics of the rear of the mission case with sufficient strengthSupportThe work device is supported via the holding member and the link, and the work device can be supported with sufficient strength, so that the operation of the work device can be stabilized.did it.
[0065]
  Claim 1 (Claim 2)According to the features, the left and right axis around the rear of the mission caseToIt was possible to simplify the structure of the long body of the wheel base by providing a moving case that can swing up and down independently, extending backward, and supporting the rear wheels at the rear of the right and left transmission cases.
[0066]
  Claim 1 (Claim 2)According to the characteristics of the paddy field work vehicle, the right and left rear wheel power is not wasted without being affected by the unevenness of the work area while suppressing the right and left tilt of the riding paddy field work vehicle. The driving performance of the riding paddy field vehicle was improved.
  Claim 1 (Claim 2)For example, even if both the right and left rear wheels ride on the convex portion of the work site, the right and left transmission cases (right and left rear wheels) swing upward, The situation where both the left rear wheel rides on the convex part of the work area is absorbed, and the state that the riding paddy work vehicle is lifted is suppressed, so the driving performance of the riding paddy work vehicle is improved in this respect as well. I was able to.
  According to the feature of claim 3, the “effect of the invention” of claim 1 or 2 is provided as in the case of claim 1 or 2, and in addition to the “effect of invention”, the following “ The effect of the invention is provided.
  According to the third aspect of the present invention, the support member is stably fixed in the left-right direction by fixing the support member at positions relatively left and right, which are the right and left boss portions of the rear portion of the mission case. Therefore, it was possible to further stabilize the operation of the working device.
[0067]
  According to the feature of claim 4, the “effect of the invention” of the above-described claims 1 to 3 is provided as in the case of any one of claims 1 to 3. The following “effects of the invention” are provided.
  According to the fourth aspect of the present invention, the support member is also used as a support frame that supports the driver's seat, and a dedicated support frame that supports the driver's seat becomes unnecessary (the support frame that supports the driver's seat is provided). Even if it was small, it was advantageous in terms of simplification of the structure.
[0068]
  According to the feature of claim 5, the “effect of the invention” of the above-mentioned claim 1 to 4 is provided as in the case of any one of claims 1 to 4, and in addition to this “effect of the invention”. The following “effects of the invention” are provided.
  According to the feature of claim 5, the support member is also used as a support frame for supporting the battery, and a dedicated support frame for supporting the battery becomes unnecessary (even if a support frame for supporting the battery is provided). It became advantageous in terms of simplification of structure).
[0069]
  According to the feature of claim 6, the “effect of the invention” of the above-described claims 1 to 3 is provided as in the case of any one of claims 1 to 3, and in addition to this “effect of the invention”. The following “effects of the invention” are provided.
  According to the feature of claim 6, the support member is also used as a support frame for supporting the driver seat and the battery, and a dedicated support frame for supporting the driver seat and the battery becomes unnecessary (the driver seat and the battery are installed). Even if a supporting frame is provided, it can be small-scale), which is advantageous in terms of simplification of the structure.
[0070]
  According to the feature of claim 6, when a driver's seat is provided above the battery, the upper part of the battery is opened by changing the driver's seat to a non-sitting position, and the negative terminal side of the battery is automatically opened. Thus, maintenance work such as battery replacement can be easily performed, and workability can be improved. According to the sixth aspect of the present invention, since the negative terminal side of the battery is in an open state relatively frequently as every time the driver's seat is changed to the non-sitting state, the discharge of the battery can be suppressed.
[Brief description of the drawings]
[Fig. 1] Overall side view of a riding rice transplanter
[Figure 2] Overall plan view of the riding rice transplanter
[Fig. 3] Side view of the vicinity of the transmission case, front wheel support case, transmission case, support frame, top link and lower link
FIG. 4 is a plan view of the vicinity of the transmission case, front wheel and front wheel support case, rear wheel and transmission case.
FIG. 5 is a plan view of the vicinity of the support frame, battery, top link, and lower link.
6 is a left side view of the front bonnet and the vicinity of the engine.
FIG. 7 is a left side view of the engine, the frame, and the vicinity of the rear frame.
FIG. 8 is a front view of the vicinity of the engine, the frame, and the rear frame.
FIG. 9 is a right side view of the engine, the frame, and the vicinity of the rear frame.
FIG. 10 is a front view of the vicinity of the lift lever and the shift lever.
FIG. 11 is a right side view of the vicinity of the lifting lever and the steering handle.
FIG. 12 is a right side view of the vicinity of the lifting lever.
FIG. 13 is a front view of the vicinity of the lifting lever.
FIG. 14 is a plan view of the lever guide of the lifting lever
FIG. 15 is a cross-sectional plan view and a side view in the vicinity of the operating shaft of the shift lever.
FIG. 16 is a left side view of the vicinity of the speed change lever and the steering handle.
FIG. 17 is a plan view of a lever guide of a shift lever.
FIG. 18 is a side view of the vicinity of a driver's seat and a battery according to another embodiment of the invention.
[Explanation of symbols]
  1 Mission case
  1a Boss
  4 Front wheels
  5 Transmission case
  6 Rear wheel
  7 Support members
  16 engine
  41 Work equipment
  42, 43 links
  58 battery
  58a Negative terminal
  59 Driver's seat
  P2 Horizontal axis

Claims (6)

A mission case that extends in the front-rear direction is arranged at the bottom, and a front wheel that can be steered is supported at the front of the mission case,
Right and left transmission cases are provided independently and vertically swingable around a left and right axial center of the rear portion of the transmission case, the right and left transmission cases extend backward, and the right and left transmission cases Support the rear wheel at the rear,
The distance in the front-rear direction between the rear wheel axle and the left-right axis is greater than the distance in the front-rear direction between the front wheel axle and the left-right axis.
The power of the engine is configured to be transmitted to the front wheels and the rear wheels via a transmission system disposed inside the transmission case, the right and left transmission cases ,
A support member is fixed to the rear part of the transmission case, and a link that can swing up and down is provided in the support member and extends rearward, and a work device is connected to the rear part of the link ,
A riding-type paddy field work vehicle in which a suspension spring is attached across the support member and the right and left transmission cases . The riding paddy field vehicle according to claim 1, wherein the support member extends rearward from the transmission case, and the link is provided at a rear portion of the support member . Boss portions projecting to the right and left lateral sides are provided on the right and left lateral sides of the rear portion of the mission case, and the right and left transmission cases are independently provided around the right and left axial centers of the right and left boss portions. While being able to swing up and down,
The riding paddy field work vehicle according to claim 1 or 2, wherein a support member is fixed to the right and left boss portions .   The riding paddy field work vehicle according to any one of claims 1 to 3, wherein the support member includes a driver's seat.   The riding paddy field work vehicle according to any one of claims 1 to 4, wherein the support member includes a battery. A battery is provided in the support member, and a driver seat is provided in a portion of the support member above the battery.
The driver's seat is configured to be freely changeable to a sitting posture covering the upper side of the battery and a non-sitting posture opening the upper side of the battery,
The negative terminal side of the battery is in an electrically conductive state when the driver seat is seated, and the negative terminal side of the battery is open when the driver seat is not seated. The riding paddy field work vehicle as described in one.

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