JP4423100B2 - Ride type rice transplanter - Google Patents

Description

  The present invention relates to a riding type rice transplanter in which a seedling planting device is connected to the rear part of a four-wheel traveling type traveling machine body.

As a riding type rice transplanter, the engine is housed in a bonnet provided above the front part of the step, and a steering handle is provided on the upper part of the control panel connected to the rear part of the bonnet. It has a front and rear split structure consisting of a front step part with an engine insertion hole and a step main part with raised seat support part and rear wheel fender part. The step main part is centered on the rear fulcrum There is one that can swing and open so that the traveling machine body can be inspected and maintained (see, for example, Patent Document 1).
JP-A-10-191728

  In the above-mentioned riding type rice transplanter, many parts of the traveling machine body are opened by opening the step main part, but it is necessary to separately remove the front step part upward in order to greatly open the engine periphery. There was a lot of work for the step desorption operation.

  This invention is made paying attention to such a point, and it aims at providing the riding type rice transplanter which can make attachment / detachment of a step easy and can improve maintenance property.

The first invention is a riding type rice transplanter in which a seedling planting device is connected to the rear part of a four-wheel traveling type traveling machine body,
An engine is arranged at the rear part of the traveling machine body, and a steering shaft with a steering handle is erected and disposed at the left and right central portions near the front end of the traveling machine body, and steps are detachably disposed on the traveling machine body. A front opening-like recessed portion through which the steering shaft is inserted is cut out at the front end portion, and a central front cover that covers the steering shaft from the periphery is erected at the front end portion of the traveling machine body, and the concave portion is formed by the central front cover. The center front cover is configured in a front-and-rear split structure including a front cover portion and a rear cover portion, and the rear cover portion passes through the concave portion of the step so as to be equipped with a front wheel. The steering shaft is erected from a bracket that is fixed to the axle case and located on the lower side of the step. Rotatably is supported, characterized in that the front cover portion are connected detachably to said rear cover portion.

  According to the above configuration, since the central front cover is merely engaged with the recess at the front end of the step and is not connected to the step, the step can be detached while leaving the central front cover. Then, when the step is removed, the traveling machine body is largely opened over its entire length, and each part of the traveling machine body including the engine at the rear of the machine body can be inspected and maintained in the work space that is largely opened.

  Further, the steering shaft can be erected at the front portion of the traveling machine body to attach the steering handle, and the step can be assembled even when the central front cover is attached so as to cover the steering shaft.

Therefore, according to the first aspect of the invention, it is possible to easily remove and attach the steps to enhance the maintainability, and it is effective in enhancing the assembling workability of the steering operation structure.

  According to the above configuration, the central front cover also functions as a steering post, eliminating the need for a dedicated steering post and contributing to a reduction in the number of parts.

According to a second invention, in the first invention,
Thereby forming the rear cover part sheet metal, it said that you have the front cover portion formed of a resin material.

According to the above configuration, the rear cover portion of the highly rigid sheet metal structure functions as a steering post, and the resin front cover portion whose shape can be set with a high degree of freedom functions as a decorative cover. While providing the above-mentioned effect of the first invention, it is possible to configure the front part of the aircraft having an excellent appearance.

According to a third invention, in the first or second invention,
A fuel tank is connected to and supported at the rear part of the body frame in the traveling body, and the upper part of the fuel tank protrudes upward through an opening formed at the rear part of the step.

According to the above configuration, the step can be removed upward while leaving the fuel tank, and the tank capacity can be increased as compared with the fuel tank in which only the replenishing port is provided in the opening formed at the rear of the step. In addition to providing the above-described effects of the first or second invention, it is effective to improve the work efficiency by reducing the fuel replenishment frequency during the work.

  FIG. 1 shows the entire side surface of the riding type rice transplanter according to the present invention, and FIG. 2 shows the entire plane. This riding type rice transplanter includes a link mechanism 5 that is driven to swing up and down by a hydraulic cylinder 4 at the rear of a four-wheel drive type traveling machine body 3 having a front wheel 1 that can be steered and a rear wheel 2 that cannot be steered. The seedling planting device 6 is connected to the rear of the traveling machine body 3 through an engine, and an engine 7 is provided at the rear of the traveling machine body 3, and a step 8 covering the engine 7 and the upper part of the traveling machine body 3 is detachably provided. The driver seat 9 is provided at the left and right central portion of the rear upper surface in Step 8, and the steering handle 11 is provided on the upper portion of the central front cover 10 erected at the front end portion of the traveling machine body 3.

  The seedling planting device 6 is configured to have a three-row planting specification. A seedling bed 12 on which three mat-like seedlings are placed side by side and reciprocated laterally with a constant stroke, and 1 from the lower end of the seedling bed 12. It consists of three sets of crank-type planting mechanisms 13 that cut out seedlings and plant them on the surface, leveling float 14 that leveles the planting location on the surface, and so on. The hydraulic cylinder 4 is controlled based on the vertical displacement of the swinging leveling float 14 that can swing freely, and the seedling planting device 6 is stably maintained at a height set with respect to the rice field regardless of whether the traveling machine body 3 is raised or lowered. Therefore, automatic planting depth control is performed to maintain a stable planting depth.

  In the traveling machine body 3, a transmission case 21 that pivotally supports the rear wheel 2 is connected to a rear end of a main frame 20 made of a pipe material, and a front axle case 22 equipped with a front wheel 1 is attached to the front end of the main frame 20. The main frame 20 has a function as a transmission case through which a front wheel drive shaft 23 that transmits power from the transmission case 21 to the front axle case 22 is inserted.

  As shown in FIG. 4, the engine 7 uses an air-cooled gasoline engine with an output shaft 7 a protruding on the left side surface. The output shaft 7a and the input shaft 21a protruding from the left side surface of the transmission case 21 are interlocked and connected by a belt transmission mechanism 25 having a tension type main clutch 24. The main clutch 24 is mechanically linked to a main clutch / brake pedal 26 provided at the foot on the right front side of step 8.

  As shown in FIG. 3, the engine power input to the mission case 21 is branched into a traveling system and a working system, and the traveling system power is gear-shifted into a plurality of stages and then left and right through the left and right side clutches 27. While being transmitted to the wheel 2, a part of the traveling system shift power is taken forward and transmitted to the front axle case 22 via the front wheel drive shaft 23, and the working system power branched in the transmission case 21. Is taken out from the upper part of the mission case 21 and transmitted to the seedling planting device 6 via the telescopic transmission shaft 15.

  The front axle case 22 is not equipped with a differential mechanism, and the transmitted power is branched to the left and right via a lateral transmission shaft 29 inserted through the front axle case 22 so that the left and right front wheels 1 are always driven at a constant speed. It has come to be. In addition, a multi-plate brake 30 that acts on the lateral transmission shaft 29 is provided at the input portion of the front axle case 22. The brake 30 is mechanically linked to the main clutch / brake pedal 26 so that when the main clutch / brake pedal 26 is depressed, the main clutch 24 is disengaged and the brake 30 is braked. It has become. The main clutch / brake pedal 26 is provided with an operation lever 26a, so that even when driving down to the ground, the main clutch / brake pedal 26 can be manually depressed to stop traveling. ing.

  A pair of left and right body frames 33 made of pipe material are installed across the left and right ends of the front stay 31 horizontally connected to the main frame 20 and the left and right ends of the rear stay 32 horizontally connected to the rear portion of the transmission case 21; The rear part of the step 8 formed by sheet metal pressing is placed and connected to the upper part of the body frame 33. In step 8, the rear part is raised to a height exceeding the engine 7, and an opening 34 through which a part of the engine 7 and the fuselage frame 33 is inserted is formed in the left and right central part of the raised part 8a. 34 is closed by a resin bonnet cover 35 that is detachably locked. A pair of left and right connecting fittings 36 extending from the body frame 33 project upward through a slit 37 formed in the bonnet cover 35, and the driver seat 9 can be turned back and forth on the connecting fitting 36. The pins are connected so that the front and rear positions can be changed. The driver's seat 9 turned to the seating posture is elastically received and supported by left and right cushion springs 38 attached to the upper surface of the raised portion 8a.

  On the right side of the raised portion 8a in step 8, there are a planting lever 41 for moving the seedling planting device 6 up and down and powering the seedling planting device 6 and a sensitivity adjusting lever 42 for adjusting the sensitivity of the planting depth automatic control. Each of them protrudes so as to be swingable back and forth, and a rectangular opening 43 is formed at the rear part of the raised portion 8 a, and the upper half of the fuel tank 44 connected to and supported by the body frame 33 extends upward from the opening 43. It is protruding.

The fuel tank 43 is formed of a translucent resin material through which the liquid level inside can be seen through, and in addition to the remaining amount display scale M1 as shown in FIG. Reference information scale M2, such as the area that can be planted with fuel or the operating time that can be planted with the remaining fuel, is also shown.

  In addition, on the left and right ends of the raised portion 8a in step 8, a reserve seedling table 45 for placing and supporting the spare seedling F is provided so as to be able to stand up and retract, and in the rear central portion of the raised portion 8a in step 8, A preliminary seedling storage frame 46 for receiving and supporting F in a horizontally long standing posture is provided. Further, a recoil knob 47 for starting the engine is provided at the right rear portion of the footrest surface in Step 8, and the left side of the raised portion 8a is formed as a flat auxiliary step surface, and a replenishment tank for refueling (Not shown) is used for mounting. In addition, the supply port 44a of the fuel tank 44 is provided to be deviated to the left side so as to approach the supply tank placed on the left side of the raised portion 8a. Further, as shown in FIG. 2, overhanging portions 8b projecting toward the front wheel 1 are formed on the left and right sides of the front portion of the step 8, and mud lifted by the front wheel 1 adheres to the upper surface of the step. Is prevented.

  The left and right central portions at the front end of step 8 are formed with a recessed portion 50 that is released forward, and the recessed portion 50 is blocked by inserting the central front cover 10 erected on the front end portion of the traveling machine body 3 up and down. It has come to be.

  The central front cover 10 is configured in a front-and-back split structure including a front cover portion 10F formed of a resin material and a rear cover portion 10R formed of a sheet metal material, and the lower end of the rear cover portion 10R is a front axle case. The front cover portion 10F is detachably locked and connected to the front portion of the rear cover portion 10R. Note that the lower end of the front cover portion 10F extends downward so as to cover the bracket 51 from the front.

  The rear cover portion 10R is formed in a half-cylinder shape that is open forward and is given high rigidity, and a steering shaft 52 having the steering handle 11 at the upper end is provided at the upper portion of the rear cover portion 10R. It is supported via a bearing 53 so as to be rotatable. Further, a shift lever 54 for operating a traveling gear transmission mechanism built in the transmission case 21 is provided on the left side of the rear cover portion 10R, and on the right side of the rear cover portion 10R, the engine 7 A hand accelerator lever 55 linked to the accelerator device is provided.

  The lower part of the steering shaft 52 is vertically supported by the bracket 51 so that the steering shaft 52 is pivotably supported. As shown in FIG. 3, a pinion gear 56 integrally formed at the lower end of the steering shaft 52 includes a bracket 51. The sect gear 57 and the knuckle arm 58 that rotates the left and right front wheels are interlocked and connected by a tie rod 59.

  As shown in FIG. 3, a pair of left and right operation rods 60 extending rearward from the sect gear 57 are linked to left and right side clutches 27 provided in the transmission case 21 so that the sect gear 57 rotates. When the front wheel 1 is steered to the left or right from the straight position beyond the set angle by being operated, the side clutch 27 of the rear wheel 2 on the inside of the turn is automatically turned off in conjunction with this. A small turn is performed in a three-wheel drive state with the left and right front wheels 1 and the one rear wheel 2 on the outside of the turn.

  The riding type rice transplanter according to the present invention is configured as described above, and it is only necessary to remove the bonnet cover 35 at the time of normal maintenance such as plug cleaning of the engine 7, plug replacement, air cleaner element replacement, and the like. When performing a large-scale maintenance of the traveling machine body 3, step 8 is removed. In this case, if the driver's seat 9 is removed from the connecting bracket 36 and the connection between the step 8 and the traveling machine body 3 is released, the step 8 can be removed with the central front cover 10 and the fuel tank 44 left.

  [Another Example]

  (1) It is possible to carry out the entire step 8 by resin molding.

  (2) It is possible to configure the entire step 8 in a sheet metal structure and mount and connect the driver seat 9 directly to the upper surface of the step 8.

Overall side view of riding rice transplanter Overall plan view of riding rice transplanter Plan view of traveling system Side view of the rear of the aircraft Front view of fuel tank attachment Longitudinal side view of the front end of the traveling aircraft Exploded perspective view of steps Transverse plan view of the center front cover Front view showing a display example attached to the fuel tank

DESCRIPTION OF SYMBOLS 1 Front wheel 3 Traveling machine body 6 Seedling planting device 7 Engine 8 Step 8a Raised part 9 Driver's seat 10 Center front cover 10F Front cover part 10R Rear cover part 11 Steering handle
22 Front axle case 33 Airframe frame 43 Opening 44 Fuel tank 50 Recess
51 Bracket 52 Steering shaft

Claims (3)

In the riding type rice transplanter with the seedling planting device connected to the rear of the four-wheel traveling vehicle,
An engine is arranged at the rear part of the traveling machine body, and a steering shaft with a steering handle is erected and disposed at the left and right central portions near the front end of the traveling machine body, and steps are detachably disposed on the traveling machine body. A front opening-like recessed portion through which the steering shaft is inserted is cut out at the front end portion, and a central front cover that covers the steering shaft from the periphery is erected at the front end portion of the traveling machine body, and the concave portion is formed by the central front cover. Configured to close ,
The central front cover is configured in a front / rear split structure consisting of a front cover portion and a rear cover portion,
The rear cover portion is erected from a bracket that passes through the recess of the step, is fixed to a front axle case equipped with a front wheel, and is positioned below the step;
The steering shaft is rotatably supported on the upper part of the rear cover part,
The riding type rice transplanter, wherein the front cover part is detachably connected to the rear cover part . The riding type rice transplanter according to claim 1, wherein the rear cover portion is made of a sheet metal material, and the front cover portion is made of a resin material . The riding type according to claim 1 or 2, wherein a fuel tank is connected and supported at a rear portion of a body frame in the traveling body, and an upper portion of the fuel tank protrudes upward through an opening formed at a rear portion of the step. Rice transplanter.

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