JP2012050409A - Sulky type working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispose a valve unit in a safe state without being interfered by other members in a sulky type agricultural working machine having a hydraulic device such as a lifting cylinder.SOLUTION: The sulky type agricultural working machine includes a traveling body 1 and a seedling planting device. The traveling body 1 has a traveling transmission casing 13, and the power of an engine is input in the traveling transmission casing 13. An HST 33 and a hydraulic pump 41 are attached separately in the lateral direction in the traveling transmission casing 13, and a power steering unit 32 and the valve unit 42 are attached separately in the longitudinal direction. Pressurized oil is fed to the lifting cylinder 6 and the seedling planting device via the valve unit 42. The valve unit 42 is safe as the valve unit 42 is disposed in a stepped part of the traveling transmission casing 13.

Description

  The present invention relates to a riding type work machine such as a riding type rice transplanter.

  An example of a riding type farm working machine is a riding type rice transplanter. This riding type rice transplanter has a traveling machine body on which an engine is mounted and a seedling planting device arranged behind the traveling machine body, and the seedling planting device is connected to the traveling machine body by a link mechanism so as to be movable up and down. The seedling planting device is moved up and down by rotating the link mechanism with a hydraulic lifting cylinder. The traveling machine body has left and right front wheels and rear wheels, and the power of the engine is transmitted to the front wheels and the rear wheels via the traveling transmission.

  The rice transplanter has a traveling transmission device having a traveling mission case as an essential member, and a shaft group, a gear group, a shifter, a traveling clutch, a differential device, a brake, and the like are arranged inside the traveling mission case. The traveling mission case has a strong structure because it places a heavy burden on it. Therefore, the traveling mission case and the rear axle case are connected by a connecting frame, and the traveling mission case is also used as a strength member (framework) of the traveling aircraft. Has been done. With this configuration, the structure of the traveling machine body can be simplified to contribute to weight reduction and cost reduction.

  Now, the seedling planting device has a planting mechanism such as a float, a seedling mount, a rotary type, etc., and the seedlings are scraped from the seedling mat one by one with the planting claws provided in the planting mechanism and planted in the field. However, the planting mechanism is arranged at the rear of the seedling planting device, and there is a front-to-back spacing between the connection point of the seedling planting device and the link mechanism and the planting claw, so the traveling machine body or seedling planting device is When tilting forward or backward due to the unevenness of the plant, the height from the auxiliary surface of the planting mechanism changes, and as a result, the planting depth changes deeper or shallower than the appropriate depth .

  Therefore, the inclination posture of the traveling machine body or the seedling planting device in a side view is detected by an inclination detecting means such as a potentiometer, and the lifting cylinder is extended or contracted based on the detection result, thereby controlling the side view of the seedling planting device. The posture of the plant is made as close to the horizontal as possible, so that the seedling planting depth is made constant. The lifting cylinder is controlled by an electromagnetic valve unit. Conventionally, as shown in Patent Documents 1 and 2, for example, the valve unit is attached to a vehicle body frame via a bracket.

JP-A-11-289826 JP 2001-169621 A

  Now, the body frame of rice transplanters is covered with a body cover (step), so there may be a little space between the body frame and the body cover, but the valve unit is a certain size There were times when it was difficult to select the installation location. In addition, since the hydraulic power source and the valve unit, and the valve unit and the lifting cylinder are connected by a pipe, the valve unit can be arranged at an arbitrary position, but the valve unit is separated from the hydraulic power source and the lifting cylinder. Inconveniences such as troublesome assembly of rice transplanters may occur.

  This invention is made in view of such a present condition, and makes it a subject to provide the riding type working machine improved regarding arrangement | positioning etc. of a valve unit.

  In order to solve the above-mentioned problems, the inventors of the present application have made the invention of each claim. Among these, the riding type working machine according to the invention of claim 1 includes a traveling machine body having a traveling mission case, a hydraulic power source that drives the hydraulic equipment, and a valve unit that controls the hydraulic equipment driven by the hydraulic power source. The valve unit is attached to the traveling mission case.

  According to a second aspect of the present invention, the hydraulic device controlled by the valve unit is an elevating cylinder for elevating a seedling planting device that is connected to the traveling machine body so as to be movable up and down. Then, the forward / backward tilt attitude of the traveling machine body is detected by an inclination detection means, and the lift cylinder is driven by operating the valve unit based on the inclination detection result.

  The invention of claim 3 embodies claim 1 or 2, and in this invention, the traveling machine body is supported so as to be able to travel by left and right front wheels and left and right rear wheels. A pair of left and right front axle devices that rotatably support the front wheels are attached, and a connecting frame extending rearward is fixed, and the rear wheels are rotatably supported by a rear axle case fixed to the connecting frame. The vehicle body frame is supported by the front axle device, the rear axle case, and the connecting frame, and the rear surface of the traveling mission case is laterally positioned so that the lower part is located behind and the upper part is located in front. The connecting frame is fixed to the lower part of the rear surface, and the valve unit is fixed to the upper part.

  A fourth aspect of the present invention embodies the first to third aspects. In the present invention, a hydraulic pump driven by an input shaft to which power is transmitted from an engine is attached to the traveling mission case, and the hydraulic pump The traveling transmission case is also used as a hydraulic oil tank supplied to the hydraulic pump.

  The invention of claim 5 embodies claim 3 or 4, and in this invention, the input shaft and the output shaft have a horizontally long posture on one side of the left and right sides of the traveling mission case. A transmission is mounted, the hydraulic pump driven by the input shaft of the continuously variable transmission is disposed on the other side of the traveling mission case, and at the front of the traveling mission case A hydraulic power steering unit is attached, and pressure oil generated by the hydraulic pump is supplied to the valve unit via the power steering unit.

  Now, for example, in a riding type rice transplanter, the traveling mission case is disposed below the vehicle body cover, and a dead space often extends outside the traveling mission case. In the invention of claim 1, since the valve unit can be arranged by effectively using the dead space outside the mission case, the design freedom can be improved accordingly. Further, since the traveling mission case and the valve unit can be integrated into one unit, it is possible to reduce the labor of assembling the work machine and the labor of managing and storing the members.

  The invention of claim 2 is applied to a rice transplanter. However, in a rice transplanter, there is often no extra space between the vehicle body cover and the vehicle body frame. Therefore, it can be said that it is particularly beneficial to apply the present invention. .

  If comprised like Claim 3, a driving | running | working mission case can be combined with the intensity | strength member of a traveling body, and it can contribute to the simplification of the structure of a traveling body, and weight reduction. And since the valve unit is fixed to the step of the traveling mission case and is guarded from below by the traveling mission case itself and the connecting frame, for example, even if the stone roller jumps up, it does not hit the valve unit. Therefore, high safety can be secured.

  As a hydraulic source, a hydraulic pump is generally used, and this hydraulic pump keeps rotating as long as the engine is operated. Since the power of the engine is input into the traveling mission case, when configured as in claim 4, the traveling mission case and the hydraulic pump are integrated, and the traveling mission case functions as an oil tank. Thus, the traveling mission case is also used as a hydraulic unit. For this reason, the whole structure can be simplified.

  In recent years, riding-type farming machines such as riding-type rice transplanters are often equipped with continuously variable transmissions such as HST (hydrostatic continuously variable transmission) to improve running feeling. In this case, the continuously variable transmission is generally attached to the traveling mission case, and the engine power is transmitted to the input shaft of the continuously variable transmission. And if the structure of Claim 5 of this application is employ | adopted, since a continuously variable transmission and a hydraulic pump are arrange | positioned in the state distributed to the right-and-left both sides of a driving | running | working mission case, a right-and-left balance is taken and the drive system of a hydraulic pump is impossible. It becomes a simple form without.

  In addition, since the hydraulic drive power steering unit is also attached to the traveling mission case, the hydraulic pump, power steering unit and valve unit are integrated into the traveling mission case. The labor of material management can be greatly reduced. In claim 5, when HST is adopted for the continuously variable transmission, hydraulic fluid of HST can be supplied from the hydraulic pump, so that hydraulic equipment is incorporated in the traveling mission case, and the working machine as a whole is compact. Can further contribute to the development.

It is a side view of the rice transplanter concerning an embodiment. It is a top view of the whole rice transplanter. It is a side view which shows the outline of a traveling body. It is a bottom view which shows the outline of a traveling body. (A) is a partial top view of a traveling body, (B) is a top view of a traveling mission case. It is a perspective view which shows the framework of a traveling machine body. It is a hydraulic circuit diagram. FIG. 6 is a separated plan view of a traveling mission case and a member attached to the traveling mission case. It is a figure which shows an raising / lowering mechanism, (A) is the perspective view seen from the right side, (B) is the isolation | separation perspective view seen from the left side. It is a separation perspective view of the important section in the state where piping was displayed. (A) is the isolation | separation perspective view of the principal part in the state which abbreviate | omitted piping, (B) is an isolation | separation side view.

  Next, an embodiment in which the present invention is applied to a riding type rice transplanter (hereinafter simply referred to as “rice transplanter”) will be described with reference to the drawings. In the following description, the words “front and rear” and “left and right” are used to specify the direction, which is based on the posture of the operator facing the forward direction.

(1). Overview of rice transplanter As shown in FIGS. 1 and 2, the rice transplanter has a traveling machine 1 and a seedling planting device 2 disposed behind it. The traveling machine body 1 is supported by left and right front wheels 3 and left and right rear wheels 4 so as to freely travel. The seedling planting device 2 is connected to the traveling machine body 1 through a lifting link mechanism 5 so as to be movable up and down. The seedling planting device 2 is lifted and lowered by rotating the lifting link mechanism 5 with a hydraulic lifting cylinder 6.

  Although not clearly shown, the seedling planting device 2 has a frame structure, and the frame structure is provided with a rotary type planting mechanism 7, a seedling stage 8, a float 9, and the like. A leveling rotor 12 is also provided. The rice transplanter of this embodiment is eight-row planting, and thus has eight planting mechanisms 7. Although not shown, a fertilizer application device can be attached to the rear part of the traveling machine body 1.

  As shown in FIGS. 3 to 6, the traveling machine body 1 has a machine body frame 10, and an engine 12 is supported by a front portion of the machine body frame 10. A traveling mission case 13 is disposed behind the engine 12, and left and right front axle devices 15 are attached to the front portion of the traveling mission case 13 via spacers 14. The front wheels 3 are attached to the left and right front axle devices 15. Is mounted so that it can swivel horizontally. The rear wheel 4 is attached to a rear axle case 16, and the traveling mission case 13 and the rear axle case 16 are connected by a cylindrical connecting frame 17.

  For example, as shown in FIG. 4, the body frame 10 includes left and right front side frames 10 a positioned at the front of the traveling body 1, left and right front frames 10 b connected to the front ends of the left and right front side frames 10 a, and left and right front sides. Left and right horizontally long middle frame 10c connected to the rear end of the side frame 10a, left and right rear side frames 10d extending rearward from the middle frame 10c, and left and right horizontally long rear frame 10e fixed to the rear end of the rear side frame 10d The rear frame 10 e is supported by the rear axle case 16 via the rear column 18. A laterally long stay 19 is fixed to the rear axle case 16, and a lower end of the rear column 18 is fixed to the stay 19.

  The connection frame 17 and the middle frame 10c are connected by a first reinforcing frame 21 that is U-shaped in a front view and tilted forward in a side view. Although not shown, the fuel tank is disposed in a state surrounded by the first reinforcing frame 21 from the front side in a plan view. The first reinforcing frame 21 and the rear axle case 16 are connected by a pair of left and right first reinforcing frames 22. The middle frame 10c projects to the left and right outside of the front side frame 10a, and auxiliary frames are attached to the projecting portion.

  Two front and rear engine frames 23 having an opening U shape are fixed to the left and right front side frames 10a upward, and the engine frame 23 supports the engine 12. The engine 12 is placed horizontally so that the crankshaft is directed in the left-right direction. The engine 12 and the traveling mission case 13 are connected via a front bracket 24.

  The engine 12 is covered with a bonnet 25, and spare seedling stands 26 are arranged on the left and right sides of the bonnet 25. A driver's seat 27 is arranged behind the bonnet 25. The traveling machine body 1 has a vehicle body cover (step) 28 on which an operator is placed. A rotary steering handle 29 is disposed in front of the driver seat 27.

  As shown in FIGS. 5A and 6, the front axle device 15 is fixed to the front side frame 10a via a bracket 30, and is attached to the fixed support portion 15a so as to be substantially horizontally rotatable. The front wheel 3 is attached to a front axle provided on the rotation support portion 15b. A tie rod 31 is connected to the rotation support portion 15b so as to be relatively rotatable. When the steering handle 19 is rotated, the left and right tie rods 31 are simultaneously moved in the opposite directions via the power steering unit 32, whereby the left and right front wheels 3 are horizontally turned in the same direction.

  For example, as shown in FIG. 7, an HST 33 is attached to the left side surface of the traveling mission case 13. The HST 33 includes a hydraulic pump 33a driven by the input shaft 34 and a hydraulic motor 33b driven by the hydraulic pump 33a. Power is transmitted to the input shaft 34 from the output shaft of the engine 12 via the belt 35. A cooling fan 36 is fixed to the input shaft 34. The power of the hydraulic motor 33 b is output via the planetary gear mechanism 73. Therefore, the HST 33 and the planetary gear mechanism 73 work together to constitute an HMT (hydraulic mechanical continuously variable transmission).

  The power changed by the HST 33 is transmitted to the front wheels 3 via the front axle device 10 via a sub-transmission mechanism consisting of a gear group, and the rear axle case 16 via the drive shaft 40 (see, for example, FIG. 6). It is transmitted to the inside and from here to the rear wheel 4. For example, as shown in FIG. 5, a work power shaft 40 'projects rearward from the right side surface of the traveling mission case 13, and the rotation of the work power shaft 40' rotates between the stock case 16 '(see FIG. 6) and the PTO. It is transmitted to the seedling planting device 2 via a shaft 40 ″ (see FIG. 1).

  Needless to say, the input shaft 34 and the output shaft of the HST 33 are horizontally long. The HST 33 is arranged so that the hydraulic pump 33a is in front and the hydraulic motor 33b is in the rear.

  As is well known, the HST 33 incorporates a swash plate for controlling the rate at which the power of the hydraulic pump is transmitted to the hydraulic motor. This swash plate is shown in FIG. 5B, for example. It is driven by rotating the control shaft 37. On the other hand, as shown in FIG. 4, a shift pedal 38 is provided on a portion of the control floor on the right side of the traveling mission case 13 in plan view. The rotation angle (depression amount) of the shift pedal 38 is detected by a potentiometer.

  Then, a control motor (not shown) is driven based on the detection signal of the potentiometer, and the control shaft 37 is rotated by a link device (not shown) moved by this control motor, so that the hydraulic pump in the HST 33 is changed from the hydraulic pump. As a result, the vehicle speed is steplessly adjusted according to the depression amount of the shift pedal 38.

  As shown in FIG. 3, the steering handle 29 is attached to the handle post 39. When the steering handle 29 is rotated, the handle shaft built in the handle post 39 rotates, and the rotational torque of the handle shaft is controlled by the power steering unit. Amplified at 32 and transmitted to the tie rod 31.

  For example, as shown in FIGS. 5 and 6, a pump unit 41 as an example of a hydraulic power source is attached to the right side surface of the traveling mission case 13, and a valve unit 42 is fixed to the rear end of the traveling mission case 13. Has been.

(2) Details of Structure Next, details of a part centering on the valve unit 42 will be described with reference to the drawings of FIG. For example, as shown in FIG. 8, the traveling mission case 13 is composed of a main body portion 13a having a deep depth and a lid portion 13b that closes the main body portion 13a. Inside, a shaft, gears, a traveling clutch, a frame, a differential device, and the like are provided. Has been placed. The traveling mission case 13 also serves as an oil tank, and hydraulic oil is supplied to the pump unit 41 via an oil filter 43 (see FIG. 7).

  As shown in FIG. 7, the pump unit 41 is a tandem type in which a charge pump 41 a and an auxiliary pump 41 b are arranged in parallel, and both pumps 41 a and 41 b are driven by the input shaft 34 of the HST 24. The HST 33 is fixed to the main body 13 a of the traveling mission case 13, and the hydraulic pump 41 is fixed to the lid 13 b of the traveling mission case 13.

  Oil is sucked into the charge pump 41 a and the auxiliary pump 41 b through the oil filter 43. The input shaft 34 of the HST 33 is always rotating as long as the engine is operated. Therefore, the charge pump 41a and the auxiliary pump 41b are always rotating. The pressure oil generated by the charge pump 41a is sent to the hydraulic oil supply port of the HST 33 through the first pipe 53. The pressure oil generated by the auxiliary pump 41 b is sent to the power steering unit 32 through the second pipe 54. Excess oil or leak oil discharged from the HST 33 returns to the traveling mission case 9 through the third pipe 55.

  In addition, as shown by a one-dot chain line in FIG. 5, it is also possible to arrange a cooling means between the HST 33 and the steeric support portion 44 such that an oil cooler 55 ′ is interposed in the middle portion of the third pipe 55. is there.

  A steering support 44 is provided on the lower part of the front end surface of the main body 13 a in the traveling mission case 13, and the power steering unit 32 is attached to the steering support 44. Further, the above-described front bracket 24 (see FIG. 5) is connected to the steering support portion 44 of the main body portion 13a by a bolt. The power steering unit 32 has a hydraulic pump, a steering gear, and the like.

  For example, as can be clearly understood from FIG. 10, the rear surface of the main body FIG. 13 a constituting the traveling mission case 13 is a lower portion constituting the substantially lower half portion with the upper rear surface 45 constituting the substantially upper half portion positioned in front. The rear surface 46 is located behind, and therefore the rear surface of the main body 13a is uneven. In other words, there is a step between the upper and lower rear surfaces 45 and 46. The valve unit 42 is fixed to the upper rear surface 45, and the connection frame 10 is fixed to the lower rear surface 46. A flange 17a is provided at the front end of the connection frame 17, and the flange 17a is fastened to the lower rear surface 46 of the traveling mission case 13 with a bolt 17b.

  The upper and lower rear surfaces 45, 46 are formed with voids opened rearward (to equalize the wall thickness as much as possible), and female screw holes 47 are formed in the periphery and boss portions. The valve unit 42 has a main body block 49. As shown in FIG. 11B, a flange 49 a is formed at the lower end of the main body block 49, and the flange 49 a is fixed to the upper rear surface 45 with a headed bolt 50. On the other hand, a recess 51 is formed in the upper portion of the main body block 49 so as to open upward and to the left and right sides. A nut 52 disposed in the recess 51 is provided on a stud bolt 52 ′ protruding from the upper rear surface 45. Screwed in.

  The hydraulic oil discharged from the power steering unit 32 is sent to the input port of the valve unit 42, branched from here and sent to the lifting cylinder 6 by the fourth pipe 56, and rolling for the seedling planting device by the fifth pipe 57. It is sent to the control device 58 '. The elevating cylinder 6 and the traveling mission case 13 are connected by a seventh pipe 59 that is a drain pipe, and the rolling control device 58 ′ and the traveling mission case 13 are also connected by an eighth pipe 60 that is a drain pipe. .

  For example, as shown in FIG. 9, the elevating cylinder 6 is arranged in a posture tilted backward with respect to the vertical node in a side view, and is connected via a bracket 62 so as to tilt in a side view with the base end as a center. It is attached to the frame 17. On the other hand, for example, as shown in FIG. 6, the elevating link mechanism 5 includes a top link 63 and a lower link 64, and the rear ends of both links 63, 64 are connected to a hitch 65 so as to be relatively rotatable. . Although not described in detail, a seedling planting device is connected to the hitch 65 via a kingpin.

  As can be understood from FIG. 6, the front ends of the top link 63 and the lower link 64 are rotatably connected to the left and right rear columns 15 via horizontally upper support shafts 66 and lower support shafts 67 (see also FIG. 9). Has been. A longitudinally long drive link 68 is rotatably connected to the rear end portion of the lower link 64 by a laterally long shaft 69, and the upper end of the auxiliary link 70 projecting obliquely upward from the front end of the lower link 64 is driven. The front end of the link 68 is connected by a horizontally long pin 71, and the pin 71 is passed through the tip of the piston rod 6 a in the elevating cylinder 6.

  Therefore, when the piston rod 6a is retracted, the drive link 68 is rotated so that the rear end thereof is raised, and thereby the seedling planting device 1 is raised. The fifth pipe 57 is connected to the front end portion of the elevating cylinder 6, and the seventh pipe 59 is connected to the base end portion of the elevating cylinder 6. That is, the piston rod 6a always moves forward by the weight of the seedling planting device 2, and by sending pressure oil to the front end portion of the lifting cylinder 6, the piston rod 6a moves backward to raise the seedling planting device 2. When the pressure oil returns from the fifth pipe 57, the piston rod 6a moves forward and the seedling planting device 2 descends. Therefore, the seedling planting device 2 can be raised and lowered by controlling the supply of pressure oil to the fifth pipe 57.

  The seedling planting device 2 is connected to the hitch 65 so as to be able to roll left and right. Then, by driving the seedling planting device rolling control device 58 ′ based on a signal from a tilt sensor (not shown) in the left and right direction, the planting depth of each row of seedlings is corrected by correcting the left and right tilt of the seedling planting device 2. Can be equalized.

  The valve unit 42 includes a flow dividing valve 74 that divides the flow of pressure oil into the lift cylinder 6 and the seedling planting rolling control device 58 ′, a lift control valve 75 that controls the flow of pressure oil to the lift cylinder 6, and a lift solenoid valve 76. A pair of electromagnetic control valves 77 for controlling the flow direction of the pressure oil to the lift control electromagnetic valve 75 and a relief valve 78 for returning the pressure oil to the traveling mission case 13 are provided. The diversion valve 74 also corresponds to a control member of the hydraulic device.

  Supply / stop / return of pressurized oil to the lifting / lowering cylinder 6 is selected by moving the sprue of the lifting / lowering control valve 75 in the axial direction by controlling the electromagnetic control valve 77 ON / OFF. The posture in side view is controlled. The electromagnetic control valve 77 is often performed by a signal from a potentiometer (or tilt sensor: not shown) provided in the traveling machine body 1 or the seedling planting device 2, but can also be driven by mechanical interlocking means.

  In the present embodiment, the elevation control valve 75 has a sudden rise port 79, a slowly rise port 80, a slowly descend port 81, and a sudden drop port 82. The pressure oil supply port and the return port from the elevation control valve 75 are used as these. The raising / lowering control of the seedling planting device 2 is accurately performed by selectively communicating with the other port. The seedling planting device 2 may be manually operated for adjustment, for example. Therefore, the lift control valve 75 is provided with a manual operation rod 83. The manual operation rod 83 can be operated by a person reaching out from the side of the traveling machine body 1.

  The seedling planting rolling control device 58 has a rolling cylinder 84 and an electromagnetic valve 85 for controlling the rolling cylinder 84. The rolling cylinder 84 has a pair of piston rods 85a protruding from both ends thereof, and the rolling posture is controlled by changing the protruding state of the piston rod 85a with the neutral position as a boundary.

(3) Summary In the above configuration, the traveling mission case 13 is disposed below the vehicle body cover 28, but the periphery of the traveling mission case 13 is a wide dead space. Since the valve unit 42 is fixed to the traveling mission case 13 using a wide dead space below the vehicle body cover 28, the valve unit 42 having a certain size can be disposed without any trouble.

  Further, since the valve unit 42 is fixed to the upper rear surface of the traveling mission case 13, the valve unit 42 is protected from below by the traveling mission case 13 itself and the connecting frame 17, so that, for example, pebbles bounce up. Even if there is, it is protected properly.

  Further, in the present embodiment, not only the HST 33, the power steering unit 32, the hydraulic pump 41, and the valve unit 42 are attached to the traveling mission case 13 as hydraulic equipment, but the traveling mission case 13 also serves as an oil tank. Therefore, hydraulic-related members and devices are unitized with the traveling mission case 13 as the center, so that it is possible to reduce the labor of assembling the rice transplanter and also the labor of managing and storing the members.

  The valve unit 42 can be provided on the lid 13b of the traveling mission case 13. However, when the valve unit 42 is provided on the main body 13a as in the present embodiment, the lid 13b can be removed while the valve unit 42 is fixed. There is an advantage that it is possible to reduce the trouble of maintenance and replacement of the members arranged in the traveling mission case 13. In the present embodiment, the valve unit 42 is merely provided with the diverter valve 74 in relation to the seedling planting rolling control device 58, but the control valve 85 of the seedling planting rolling control device 58 is provided in the valve unit 42. It is also possible to provide it.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the application target is not limited to the rice transplanter, but can be applied to other riding-type agricultural machines. Furthermore, the structure and function of the valve unit can be selected as required. Furthermore, the arrangement position of the valve unit is not limited to the rear surface of the traveling mission case, and can be fixed to other parts such as the side surface of the traveling mission case.

  It is also possible to provide a cover for protecting the valve unit. In the case where the valve unit is disposed on the stepped portion of the traveling mission case, the stepped portion may be provided on the front surface of the traveling mission case provided on the left or right side surface.

  The invention of the present application is embodied in a riding-type farm work machine such as a rice transplanter and exhibits utility. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Seedling planting device 5 Lifting link mechanism 6 Lifting cylinder 12 Engine 13 Traveling mission case 15 Front axle device 16 Rear axle case 17 Body frame 28 Body cover (step)
32 Power steering unit 33 HST as an example of continuously variable transmission
34 HST input shaft 41 Hydraulic pump as hydraulic source 42 Valve unit 45 Upper rear surface of traveling mission case 46 Lower rear surface of traveling mission case 49 Main body block 58 Seedling device rolling control device 75 Lift control valve 84 Seedling device rolling control device Control valve

Claims (5)

A traveling machine body having a traveling mission case; a hydraulic power source that drives a hydraulic device; and a valve unit that controls the hydraulic device driven by the hydraulic power source; and the valve unit is attached to the traveling mission case. Yes,
Riding type work machine. The hydraulic device controlled by the valve unit is an elevating cylinder for elevating a seedling planting device that is connected to the traveling machine body so as to be movable up and down. The elevating cylinder is driven by operating the valve unit based on a detection result.
The riding type rice transplanter as a riding type agricultural working machine as the riding type working machine according to claim 1. The traveling machine body is supported by a left and right front wheel and a left and right rear wheel so as to be able to travel freely, and the traveling mission case is provided with a pair of left and right front axle devices that rotatably support the front wheels and facing backward. A connecting frame extending to the rear frame is fixed, a rear axle case fixed to the connecting frame supports a rear wheel rotatably, and a vehicle body frame is supported by the front axle device, the rear axle case, and the connecting frame. ,
Furthermore, the rear surface of the traveling mission case is stepped in a side view so that the lower part is located at the rear and the upper part is located at the front, and the connecting frame is fixed to the lower part of the rear surface. Fixing the valve unit,
The riding type work machine according to claim 1 or 2. A hydraulic pump driven by an input shaft to which power is transmitted from an engine is attached to the traveling mission case, and the hydraulic pump serves as the hydraulic power source, while the traveling mission case is supplied to the hydraulic pump. Which is also used as a hydraulic oil tank
The riding type work machine according to any one of claims 1 to 3. A continuously variable transmission having an input shaft and an output shaft in a horizontally long posture is attached to one of the left and right side surfaces of the traveling mission case, and the continuously variable transmission is disposed on the other side surface of the traveling mission case. The hydraulic pump driven by the input shaft of the machine is disposed, and a hydraulic power steering unit is attached to the front of the traveling mission case, and the pressure oil generated by the hydraulic pump is the power Being supplied to the valve unit via a steering unit,
The riding type work machine according to claim 3 or 4.

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