JP2006345764A - Riding type rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding type rice transplanter so as not to make a worker in contact with an operation lever, when the worker walks on a deck part at the side direction of a front bonnet. <P>SOLUTION: This riding type rice transplanter is provided by making an upper column 46 and a lower column 45 equipped with a handle 24 at its upper end as bendable in front and rear direction through a tilt mechanism 47, protruding the upper column 46 in upper direction from the top part of the front bonnet 19 of a traveling machine body, arranging a composite lever 49 at the one end of the bonnet 19 so that its base end part is protruded in the outward width direction of the traveling machine body from its outer peripheral surface and the free end side of the lever can be rotationally operated in front and rear direction, and by an upper surface view, constituting so that the composite lever 49 approaches to near the center of width direction of the traveling machine body relative to the upper shaft of the steering on rotationally operating the free end side of the composite lever 49 in the front part direction of the traveling machine body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a riding-type rice transplanter that is easy to operate at both positions from above the traveling machine body and from the ground in front of the traveling machine body.

  Conventionally, during normal rice planting operations, the operator can steer the vehicle forward while riding on the traveling machine body, while the operator must be able to put it on or off the transporter such as over a fence or a truck. As a riding type rice transplanter configured to be able to operate a traveling machine body in a state where it is descended from the traveling machine body, in Patent Document 1, an engine and a transmission case are mounted on the rear side of the traveling machine body configured to be a front and rear four-wheel drive. The lower operating shaft standing upright on the front frame of the fuselage and the upper operating shaft with a round handle for steering the front wheels attached to the upper end are connected via a universal joint having a tilt fulcrum, and the forward / backward tilt angle The structure which can change is disclosed.

  And in patent document 1, the main clutch pedal is provided in the one side site | part of the front bonnet of the front part of a traveling body. This main clutch pedal is configured so that power transmission from the engine to the transmission case is cut off when an operator sitting on a seat at the rear part of the round handle of the traveling body steps downward with his / her foot. Further, it is disclosed that the base of the auxiliary lever is fixed to the arm of the main clutch pedal, and the tip end side of the auxiliary lever is passed through the front surface of the front bonnet so as to extend forward from the traveling body (first). (See Figure 1).

  With this configuration, the operator can perform the steering operation with the round handle and the on / off operation of the main clutch even when the operator is on the traveling aircraft body or descends ahead of the traveling aircraft body and from the ground. Also, on the other side of the front bonnet (right side as viewed in the direction of travel), a main clutch lever for turning on and off the transmission of power from the engine to the transmission case, and a planting part elevating lever are arranged, Their operation directions are set along the front-rear direction of the traveling machine body.

On the other hand, in Patent Document 2, substeps (deck portions) through which an operator can pass are provided on the left and right sides of the front bonnet at the front of the traveling machine body, and a seedling mat to be replenished is placed on the outside thereof. A spare seedling stand is provided. A main transmission lever and a seeding lever are disposed at a rear portion of the front bonnet so as to be substantially parallel to the steering column.
Japanese Patent Publication No. 2574680 (refer to FIGS. 1, 4 and 5) Japanese Patent Laid-Open No. 11-318141 (see FIGS. 1, 2, and 21)

  According to the configuration of Patent Document 2, the operation levers such as the main transmission lever and the seedling lever are arranged closer to the center side of the traveling machine body than the outer peripheral surface of the front bonnet in the width direction of the traveling machine body. Since the operation lever rarely touches or collides with the operator's leg or the like passing through the step (deck part), the operation lever is deformed or the operation lever moves inadvertently and malfunctions. Although there is no problem, since the control lever is set to rotate to the side closer to the worker sitting on the seat than the standing posture of the steering column on the rear side of the front bonnet, There was a problem that it was difficult for the operator to operate the operation lever.

  On the other hand, according to the configuration of Patent Document 1, unless the pedal is continuously pressed, the main clutch cannot be held in the disengaged state, and the auxiliary lever for the main clutch protrudes to the front end side of the front bonnet. When the traveling aircraft is stopped and the engine power is required for seeding work, etc., the engine is temporarily stopped and the traveling aircraft is completely stopped. There is a problem that the operation is troublesome, such as operation.

  The present invention has been made to solve the above-described conventional problems, and does not interfere with the walking or farming of the worker on the side of the front bonnet of the traveling machine body, and the worker gets down to the ground. An object of the present invention is to provide a riding type rice transplanter that can ensure the reliability of ground operation in front of a traveling machine body.

  In order to achieve the above object, the riding type rice transplanter according to the first aspect of the present invention is a riding type in which a power unit such as an engine is disposed at the front part of the traveling machine body, and a seedling planting device is connected to the rear part of the traveling machine body so as to be movable up and down. In the rice transplanter, the front bonnet that covers the engine is formed such that the width dimension along the width direction of the traveling machine body is gradually reduced from the lower end of the front bonnet to the upper part of the front bonnet. The steering upper shaft protrudes, and at the upper end of the steering upper shaft, a steering handle that can be steered by an operator sitting on a seat provided on the traveling machine body is provided, and an outer periphery of the front bonnet is provided on one side of the front bonnet. Set the control lever so that the base end protrudes outward from the surface in the width direction of the traveling vehicle body and the free end side rotates in the longitudinal direction of the traveling vehicle body. In the top view, when the free end side of the operation lever is rotated in the front direction of the traveling machine body, it is configured to approach the center of the traveling machine body in the width direction with respect to the steering upper shaft. It is what.

  According to a second aspect of the present invention, in the riding type rice transplanter according to the first aspect, in the top view, the free end side of the operation lever when the rotary operation is performed in the front direction of the traveling machine body is the steering handle. Is set so that the free end side of the operating lever is positioned outside the outermost diameter of the steering wheel when it is rotated in the rearward direction of the traveling machine body while being positioned on the inner diameter side of the outermost diameter of the steering wheel. It is.

  According to a third aspect of the present invention, in the riding type rice transplanter according to the second aspect, the operation lever simultaneously performs a power transmission on / off operation of the engine and a braking operation of the traveling machine body. Yes, when the operation lever is rotated in the front direction of the traveling machine body, the power transmission from the engine is cut off and the braking operation of the traveling machine body is executed, and the operation lever is moved in the rear direction of the traveling machine body. When the turning operation is performed, power is transmitted from the engine, and a braking release operation of the traveling machine body is performed.

  According to a fourth aspect of the present invention, in the riding type rice transplanter according to any one of the first to third aspects, the steering upper shaft is configured to be bent in the front-rear direction of the traveling machine body, and the operation lever is the steering It is arrange | positioned at the cover body of the said front bonnet which moves back and forth with the bending motion of an upper axis | shaft.

  According to a fifth aspect of the present invention, in the riding type rice transplanter according to any one of the first to fourth aspects, the traveling machine body is provided with a deck portion that allows an operator to pass on both right and left sides of the front bonnet. A spare seedling stand is provided outside the traveling machine body from the deck portion.

  According to the first aspect of the present invention, there is no need to walk on the side deck portion of the front bonnet or the leg portion or waist portion of the worker who performs the farm work, and the operation lever is not prepared. It is possible to eliminate problems such as the operation lever being bent and deformed.

  According to the second aspect of the present invention, when viewed from above, the free end side of the operating lever when rotating in the front direction of the traveling body is set to the inner diameter side from the outermost diameter of the steering handle. On the other hand, since the free end side of the operation lever when rotating in the rear direction of the traveling machine body is set to be positioned outside the outermost diameter of the steering handle, the operator can Since it hits the steering handle before hitting the free end side of the lever, the effect of claim 1 is further ensured.

  According to the third aspect of the present invention, when the operating lever is rotated in the front direction of the traveling machine body, the main clutch mechanism is disengaged and the brake means can maintain the braking state. There is nothing to do.

  According to the fourth aspect of the present invention, since the configuration in which the steering upper shaft can be tilted forward of the traveling machine body is adopted, both the state where the operator is on the traveling machine body and the case where the operator descends the ground and operates the rice transplanter. In this case, the operation lever can be easily operated.

  According to the invention described in claim 5, the legs, waists, etc. of the operator who performs the work for taking out the seedling mat from the outside preliminary seedling stand do not hit the composite lever, and the composite lever moves inadvertently. There is no malfunction, and problems such as bending and deformation of the composite lever can be solved.

  In particular, when the main clutch mechanism is disengaged and the brake means maintains the braking state when rotating in the front direction of the traveling machine body, the malfunction does not occur at the starting position.

  Next, the best embodiment of the present invention will be described with reference to the drawings. 1 is a side view of a riding type rice transplanter, FIG. 2 is a plan view, FIG. 3 is a perspective view of a traveling machine body, FIG. 4 is a side view of the front part of the traveling machine body, FIG. 5 is a side view showing a tilted state, and FIG. 7 is a perspective view of the front wheel differential lock device and its operation interlocking mechanism as viewed from above, FIG. 7 is a perspective view of the front wheel differential lock device and its operation interlocking mechanism as viewed from below, and FIG. 8 shows the operation interlocking state of the tilt portion and the front wheel differential lock. FIG. 9 is a side view, FIG. 10 is a perspective view showing the tilt mechanism and the posture holding means, FIG. 11 is a plan view showing the internal mechanism of the mission case, and FIG. 12 explains the arrangement and operation range of the composite operation lever. FIG. 13 is a perspective view seen from the left side of the mission case showing the interlocking mechanism between the composite lever and the main clutch, FIG. 14 is a perspective view of the interlocking mechanism seen from the right side of the mission case, and FIG. Case Perspective view of the interlocking mechanism, as viewed from the right lower surface, FIG. 16 is an enlarged perspective view of the interlocking mechanism.

  As shown in FIGS. 1 to 3, the traveling machine body in the four-row planted type rice transplanter of the present embodiment includes a main frame 1 a and a subframe 1 b. The main frame 1a is configured by connecting a transmission case 2 to which an engine 21 is fixed on the upper surface and a front axle case 4 is mounted on both right and left sides, and a rear axle case 5 by a metal traveling frame 3 having a longitudinal longitudinal direction. Has been. The sub-frame 1b has a configuration in which rectangular or round-shaped frame members are arranged and connected to the left and right sides of the main frame 1a (see FIGS. 2 and 3).

  A transmission case 2 made of an aluminum alloy or the like and having an integrated case body that is long in the front-rear direction is formed by integrating a divided case divided into the left and right sides of the traveling machine body by bolting the housing of the internal mechanism. A front axle case 4 protrudes from the left and right side surfaces of the middle part of the transmission case 2 in the front-rear direction, and a rear axle case 5 is attached to the rear end of the traveling frame 3. A front wheel 4a is attached to the left and right ends of the front axle case 4, and a rear wheel 5a is attached to the left and right ends of the rear axle case 5, respectively (see FIGS. 1 and 2). The cross section of the traveling frame 3 is formed in an open downward U-shape.

  A seedling planting device 7 is connected to the rear end of the main frame 1a through a parallel link mechanism 6 composed of upper and lower links so as to be moved up and down. The seedling planting device 7 has a conventionally known structure, that is, a pair of left and right planting transmission cases 11 to which power is transmitted via a universal joint shaft from a PTO shaft 9 projecting rearward from the mission case 2, and an upper end of the seedling planting device 7 runs. A seedling stand 12 tilted forward so as to approach the rear part of the machine body, a float 13 placed on the lower surface of each planting transmission case 11, and attached to the left and right sides of each planting transmission case 11, the farm scene and seedlings It consists of a planting mechanism 14 with planting claws that divides and plants one by one from the seedling mat on the seedling mounting table 12 while moving up and down between the lower end of the mounting table 12. And the raising / lowering hydraulic cylinder 15 provided in the rear end of the main frame 1a is attached in connection with the parallel link mechanism 6, and can raise / lower the seedling planting apparatus 7 largely.

  Further, a synthetic resin body cover 16 arranged so as to cover the main frame 1a and the subframe 1b from above is mainly attached to the subframe 1b. On the subframe 1b, a seat body 17 is mounted on a seat support shaft standing from the subframe 1b. In front of it, a lower fixed cover body 19 a of a front bonnet (engine hood) 19 is fixedly erected on the upper surface of the vehicle body cover 16. The front bonnet 19 includes a lower fixed cover body 19a, a movable cover body 25, and an auxiliary cover body 26, which are made of synthetic resin or glass fiber reinforced plastic. Then, an opening 61 having a substantially U shape in a plan view formed in a cutout is formed from the upper surface side to the front end of the lower fixed cover body 19a (see FIG. 5). The opening 61 is covered with a movable cover body 25 attached so as to move back and forth integrally with the upper column 46, and an auxiliary cover body 26 connected to the movable cover body 25 so as to be rotatable upward.

  The front bonnet 19 with the opening 61 covered with the movable cover body 25 and the auxiliary cover body 26 has a dimension along the front-rear direction of the traveling machine body on the lower edge side longer than a dimension along the width direction of the traveling machine body, In addition, the dimension of the front bonnet 19 along the width direction of the traveling machine body is formed so as to be gradually smaller toward the upper side with respect to the dimension of the lower end edge of the front bonnet 19 (FIGS. 1, 2, and 4). reference).

  A plurality of spare seedling mats are placed on the left and right outer sides of the vehicle body cover 16 on the left and right sides of the lower end edge of the lower fixed cover body 19a along the traveling direction of the traveling machine body. Therefore, a preliminary seedling stand 18 is disposed (see FIGS. 1 and 2). The support of each preliminary seedling stand 18 is erected from the subframe 1b.

  A steering lower shaft 20, an engine 21, a fuel tank 22, and the like that are erected from an upper surface front end side of a mission case 2 described later are disposed inside the lower fixed cover body 19 a. A steering upper shaft 23 is connected to the steering lower shaft 20 via a universal shaft joint 27, and a steering upper shaft (handle shaft) 23 having a round handle 24 attached to the upper end thereof is a longitudinal direction of the traveling machine body. It can be bent (tiltable). A tilt mechanism 47 and its upper portion are provided between an upper end of a lower column 45 standing on the front portion of the upper surface of the transmission case 2 and surrounding the outer periphery of the steering lower shaft 20 and an upper column 46 surrounding the outer periphery of the steering upper shaft 23. Posture holding means 48 is provided for holding the inclination angle in a plurality of stages (see FIGS. 3 to 6).

  The transmission case 2 includes a steering drive mechanism 28 for steering in its front part, and a traveling drive system 29 and a power transmission mechanism 31 to the PTO drive system 30 in its middle part to the rear part. (See FIG. 11). The mission case 2 has a step in the middle so that the height of the front part on the upper surface side is low and the height is higher from the middle part to the rear part in a side view. On the stepped portion, a flat foot portion of the engine support member 32 straddling right and left on the upper surface of the mission case 2 is fixed with bolts. A base portion (crankcase portion) of the engine 21 is fixed to the engine support member 32, and a piston cylinder case of the engine 21 is disposed so as to be inclined rearward and upward. The engine 21 may be fixed upright. Pulleys 33a, 34a, belts, which are conventionally known belt transmission mechanisms with a tension type main clutch mechanism 35a, are provided on the output shaft 33 of the engine 21 and the input shaft 34 projecting to one side surface in the longitudinal direction of the transmission case 2. Power is transmitted by providing 35, and power is transmitted from the input shaft 34 to the power transmission mechanism 31 in the mission case 2.

  The power transmission mechanism 31 includes a gear-type transmission mechanism 38 that changes the rotational speed from the input shaft 34. Power is transmitted from the gear-type transmission mechanism 38 to the front axle shaft 39 with the front wheel differential device (differential mechanism) 39a through the transmission shaft 37 having the traveling brake 37a, while the output to the rear wheels is transmitted through the bevel gear 37b. Power is transmitted to the shaft 40 (FIG. 11). Therefore, when the traveling brake means 37a is operated, the front wheel 4a and the rear wheel 5a are braked. The base portion of the horizontally long cylindrical portion 4b of the front axle case 4 is bolted to the side surface of the transmission case 2, and power is transmitted from the front axle shaft 39 disposed in the horizontally long cylindrical portion 4b to the axle of the front wheel 4a. On the other hand, the output shaft 40 protrudes rearward from the right side surface of the transmission case 2, and is transmitted from the output shaft 40 to the transmission shaft 41 via a universal joint, and is transmitted to the rear axle 5 as a traveling drive system to the rear wheels. (See FIGS. 1 and 11).

  On the other hand, a PTO shaft 9 that protrudes rearward from the rear end of the transmission case 2 via the PTO clutch from the gear-type transmission mechanism 38 is provided (see FIGS. 1 and 4).

  The traveling frame 3 has a U-shaped cross-section with the side plate 3b bent downward from the left and right sides of the upper surface plate 3a (see FIG. 3). The front portion of the traveling frame 3 is covered from the outside to the rear side of the left and right side surfaces of the mission case 2, and both side plates 3 b of the traveling frame 3 are horizontally connected from the left and right outer sides by the connecting bolts 53. Fastened to the side. Further, the rear side of the upper surface plate 3a of the traveling frame 3 is fastened to a pair of bracket portions (not shown) protruding upward from the upper portion of the central case portion 5b of the rear axle case 5 with connecting bolts (not shown). It is connected. Furthermore, the fin pieces 3c on the left and right sides of the traveling frame 3 are fastened and connected by a connecting bolt to a pair of bracket portions 56 protruding forward from the front portion of the central case portion 5b (see FIG. 3).

  The PTO shaft 9 is disposed inside the traveling frame 3 described above, and is pivotally supported by a bearing portion (not shown) that is attached to the rear end of the traveling frame 3 and above the central case portion 5b. The transmission shaft 41 extends along the outside of the right side surface of the traveling frame 3 and is connected to the shaft on the front surface of the central case portion 5 b of the rear axle 5.

  A steering link mechanism 44 such as a pitman arm, a connecting rod, and a tie rod that changes the steering direction of the left and right front wheels 4a is disposed below the steering drive mechanism 28 at the front of the mission case 2 (see FIGS. 3 and 4).

  Next, the upper column 46 is selectively moved back and forth at a rear position where the steering handle (round handle) 24 at the upper end of the upper column 46 approaches the steering seat body 17 and a position where the steering handle body 17 bends forward. A tilt mechanism that can be bent in the direction will be described. A fuel tank 22 is fixed on a frame erected from the main frame 1 in the lower fixed cover body 19a made of synthetic resin (or made of glass fiber reinforced plastic) near the rear.

  A steering lower shaft 20 that is also erected from the transmission case is disposed in a cylindrical lower column 45 that is fixedly erected and fixed to the front end of the upper surface of the transmission case 2 located at the front portion in the lower fixed cover body 19a. Has been. An upper end of the steering lower shaft 20 and a lower end of the steering upper shaft 23 having a steering handle 24 attached to the upper end are connected via a universal shaft joint 27 so as to be bent. The steering upper shaft 23 is rotatably mounted in the upper column 46. An upper column 46 (steering upper shaft 23) is attached to substantially the top of the movable cover body 25 so as to penetrate upward.

  The hook-shaped universal shaft joint 27 has a conventionally known structure, for example, a pair of opposing portions of a cross-shaped connecting bracket 27a and a bifurcated yoke portion 20a at the upper end of the steering lower shaft 20 via a pin. On the other hand, the bifurcated yoke portion 23a at the lower end of the steering upper shaft 23 and the other pair of facing portions of the coupling fitting 27a are rotatably coupled via pins. According to this configuration, when the depression angle θ1 (see FIG. 9) between the axis line of the steering lower shaft 20 and the axis line of the steering upper shaft 23 is equal to or less than a certain angle (for example, approximately 110 degrees or less), the yoke portions 20a and 23a Interferes with (impacts), so that the rotational force of the steering upper shaft 23 cannot be transmitted to the steering lower shaft 20, and a so-called handle lock state is established.

  Further, the upper end of the lower column 45 and the lower end of the cylindrical upper column 46 are connected to each other so as to be able to tilt forward and backward via a tilt mechanism 47, and the tilt angle of the upper column 46 (and thus the depression angle) is provided on the outer periphery of the tilt mechanism 47. ) In a plurality of stages is provided (see FIGS. 6 to 10).

  The tilt mechanism 47 includes a pair of left and right brackets 47a fixed to the upper end of the lower column 45 and a pair of left and right brackets 47b fixed to the lower end of the outer periphery of the upper column 46 via a pivot shaft 47c. In other words, the upper column 46 is connected to the lower column 45 so as to be tiltable (bendable) (see FIGS. 6 to 10).

  As shown in FIGS. 6 to 10, the posture holding means 48 has a plurality of positions (three in the embodiment) that are recessed at positions appropriately separated from each other on the eccentric arc-shaped upper end surface of one side piece of the bracket 47 a. Locking grooves 60 (indicated individually by reference numerals 60a, 60b and 60c), a horizontal shaft 48a pivotally supported by the rear end piece 47d of the upper bracket 47b, and one end of the horizontal shaft 48a. And an urging spring (not shown) wound around the horizontal shaft 48a and urging the engagement hook 48b downward (in the engaging direction of the locking groove 60). When the upper column 46 is changed to a predetermined rearward tilt or forward tilt angle, the engagement hook 48b selectively engages with any one of the locking grooves 60 at a plurality of positions, thereby The tilting posture of the column 46 can be adjusted and held.

  In the embodiment, as shown in FIG. 5, the first posture I in which the upper column 46 is inclined rearward (approximately 30 degrees clockwise with respect to the vertical line) and then travels approximately 60 degrees counterclockwise. The second posture II can be selected from the second posture II tilted forward in front of the vehicle body, and the third posture III can be largely tilted forward from the first posture I in the counterclockwise direction by approximately 88 degrees to the front of the vehicle body. When the upper column 46 is in the first posture I, the engagement hook 48b is fitted in the rearmost locking groove 60a of the upper surface of the lower bracket 47a. When the upper column 46 is in the second posture II, the engaging hook 48b is engaged with the locking groove 60b at the front and rear center position, and when the upper column 46 is in the third posture III, the engaging hook is engaged with the front locking groove 60c. 48b is fitted.

  The auxiliary cover body 26 is provided so as to be rotatable up and down around the front end side of the movable cover body 25. That is, as shown in FIG. 3, the support pipe 62 is fixed laterally at the tip of the support bracket member that protrudes upward from the lower portion of the upper column 46. On the other hand, a pair of left and right shaft portions of a reinforcing and operating member 63 fixed to the back surface of the auxiliary cover body 26 and bent in a U-shape are rotatably inserted into both ends of the support pipe 62.

  The operation member 63 is associated as an operation unit of the posture holding means 48. That is, as shown in FIGS. 9 and 10, a link 64 is rotatably connected to a pin protruding from the shaft portion of the operation member 63 at an eccentric position. The other end of the link 64 is rotatably connected to the tip of an arm 65 fixed to the other end of the horizontal shaft 48a that rotates integrally with the engagement hook 48b. The biasing force of the biasing spring biases the auxiliary cover body 26 and thus the lower end side of the operation member 63 so as to approach the surface of the lower fixed cover body 19a.

  Therefore, when the auxiliary cover body 26 and thus the lower end side of the operation member 63 is turned upward by a predetermined angle so as to be separated from the surface of the lower fixed cover body 19a, the link 64 against the urging force of the urging spring. Since the tip end portion of the engagement hook 48b is rotated (unlocked) via the arm 65 so as to be disengaged from the first locking groove 60a, thereafter, the hand is released from the auxiliary cover body 26 (auxiliary cover). With the lower end side inner surface of the body 26 in sliding contact with the outer edge of the opening 61 of the lower fixed cover body 19a), the operator holds the handle 24 and shifts from the first posture I to the second posture II. it can. In the second posture II, the distal end portion of the engagement hook 48b is engaged with the second locking groove 60b. Further, in order to move to the third posture III, the auxiliary cover body 26 (operation member 63) is again turned upward by a predetermined angle to release the lock, and then the handle 24 is tilted forward. Is engaged with the third locking groove 60c. In this way, the upper column 46 can be largely tilted forward in a stepwise manner in front of the traveling machine body.

  In the present embodiment, from the pivot shaft 47c, which is the center of tilt (bending movement), to the bottom surfaces of the locking grooves 60a, 60b, 60c at a plurality of positions (three positions in the embodiment) formed in the outer peripheral surface of the lower bracket 47a. Is set so as to increase sequentially, the downward angle of the auxiliary cover body 26 (operation member 63) when the tip end of the engagement hook 48b is engaged with the first engagement groove 60a. The auxiliary cover body 26 (operation member 63) has a lower end protruding forward of the traveling machine body (opening of the lower fixed cover body 19a) when engaged with the second locking groove 60b. When the auxiliary cover body 26 (operation member 63) is engaged with the third locking groove 60c, the lower end of the auxiliary cover body 26 (the operation member 63) protrudes greatly forward of the traveling machine body. Posture (opening of the lower fixed cover body 19a It becomes larger apart from that attitude) from the part 61.

  When the upper column 46 is in the first posture I, the auxiliary cover body 26 is substantially vertical in a state in which the front end side of the opening 61 of the lower fixed cover body 19a is tightly covered as shown by the solid line in FIG. In the side view of the riding type rice transplanter, the axis of the upper column 46 and the back surface of the auxiliary cover body 26 are substantially parallel, and the lower end of the auxiliary cover body 26 is larger than the round handle 24 of the steering. It is separated.

  In the state of the second posture II (see the solid line state in FIG. 5), the included angle between the axis of the upper column 46 and the back surface of the auxiliary cover body 26 is narrowed to about 160 degrees, and the auxiliary cover with respect to the steering handle 24. The lower end of the body 26 is closer to the first posture I than the first posture I. In other words, an operator whose depression angle with respect to the back surface of the auxiliary cover body 26 (operation member 63) is approximately 48 degrees and whose lower end is located in front of the traveling machine body. It will be in a state approaching.

  And in the 3rd attitude | position III (refer the two-dot chain line state of FIG. 5) in which the steering handle 24 inclined so that it might be located ahead rather than the front end of a traveling body, the axis line of the upper column 46, the back surface of the auxiliary cover body 26, The included angle is narrowed to about 110 degrees, and the lower end of the auxiliary cover body 26 is closer to the steering handle 24 than in the second posture II. In other words, the depression angle between the back surface of the auxiliary cover body 26 (operation member 63) and the vertical is about 90 degrees, and the lower end of the auxiliary cover body 26 (operation member 63) protrudes in a substantially horizontal shape in front of the traveling machine body. The state becomes closer to the operator.

  Therefore, when the worker is on the ground in front of the traveling machine body and performs the dismounting work, the operator's hand can more easily reach the auxiliary cover body 26 when the upper column 46 is tilted forward. Play.

  Note that the operation of tilting the upper column 46 forward is possible only when the worker is positioned on the ground in front of the traveling machine body. In other words, in the state where the operator is on the traveling machine body. Since tilting (bending movement) is impossible, there is no inconvenience due to an erroneous operation, and the reliability of the ground operation can be ensured.

  An operator can steer the riding type rice transplanter while boarding the traveling machine body, and an operator who has descended from the traveling machine body to the ground moves the steering wheel round handle 24 while being positioned in front of the traveling machine body. It is possible to carry the riding-type rice transplanter over the field or to put it on a truck.

  Further, since the auxiliary cover body 26 is provided at the front end portion of the movable cover body 25, it is possible to make it easier for the operator who has descended to the ground to adjust the tilt while being positioned in front of the traveling machine body. When the upper column 46 is in the first posture I toward the control seat 17 on the traveling machine body, the movable cover body 25 and the auxiliary cover body 26 completely cover the opening 61 of the lower fixed cover body 19a. Therefore, air resistance during traveling can be reduced, and rain and dust do not enter the front bonnet 19.

  Next, in conjunction with tilting the steering handle 24 and thus the upper column 46 to the front of the traveling machine body, a differential lock device 66 for operating the front wheel differential device 39a as a differential lock (differential restriction), and this differential lock device 66, An interlocking mechanism (device) 67 for operating (diff lock operation) in conjunction with the forward tilt of the handle 24 will be described. The differential lock device 66 is provided with an engagement cam 72 on the back surface of the differential small gear 71 in the gear box 70 in the front wheel differential device 39a, and a drive cam 73 fitted on one front axle shaft 39 so as to be slidable only. Then, it is slid by the action pin 74 that penetrates the inside and outside of the mission case 2 and rotates around the axis. When the drive cam 73 is engaged with the engagement cam 72, the left and right front axle shafts 39, 39 can be driven with the same torque (that is, a diff lock operation). On the other hand, the differential action of the front wheel differential device 39a can be exerted by releasing the engagement between the drive cam 73 and the engagement cam 72 (see FIGS. 7 and 11).

  On the other hand, on the outer surface of one bracket 47 a at the upper end of the lower column 45, a rotating arm 75 in a link type interlocking mechanism 67 is pivotally supported by a horizontal shaft 76 so as to be able to rotate back and forth. On one side piece 75a of the rotating arm 75, an operating pin 77 is provided in front of the front end face of the one bracket 47a so as to protrude in the forward direction of the universal joint 27 (FIGS. 6 to 9). reference). The lower end of the rotating arm 75 and the action arm 78 attached to the upper end of the action pin 74 are connected by a link rod 79. When the depression angle (the depression angle in the claims) between the axis line of the lower column 45 and the axis line of the upper column 46 when the upper column 46 is rotated forward is fixed to a predetermined value or less, the upper column 46 is fixed to the lower end of one side surface. The operation pin 77 is pushed on the front surface of the lower bracket 47b (refer to the two-dot chain line in FIG. 9), whereby the lower end side of the rotating arm 75 rotates to the rear side of the traveling machine body, and the link rod 79 faces rearward. Move. Thus, the action pin 74 is rotated around the axis via the action arm 78, and the drive cam 73 is configured to engage with the engagement cam 72. In this way, the link type interlocking mechanism 67 is configured.

  According to the above configuration, when riding over the riding type rice transplanter or climbing an inclined stepping board from the road and placing it on a truck, the worker (worker) who gets off the traveling machine turns forward in front of the traveling machine, The upper column 46 is tilted forward so that the steering handle 24 approaches the front of the traveling machine body. As shown in FIG. 5, when the upper column 46 is tilted forward (bent) to the posture (third posture III) greatly tilted forward to the left end side, the differential lock device 66 is operated, and the left and right front wheels 4a, 4a are integrated. Thus, the slip phenomenon of only one of the front wheels does not occur, so that it is possible to reliably carry out the overpass work and the work of placing on the truck. At this time, as described above, since the handle lock function can be exhibited at the position of the universal shaft joint 27, even if the steering handle 24 is gripped and rotated, it is locked and the left and right front wheels 4a and 4a are fixed in the straight direction. (Locked). Therefore, the straight running performance of the rice transplanter can be further improved and the work can be performed more reliably. In the state of the second posture II and the first posture I, neither the above-described differential lock action nor the handle lock action is realized.

  In this way, the state of the field (slack) can be selected between the differential lock operation state (and the handle lock operation state) and the non-diff lock operation state (and the non-handle lock operation state) depending on the degree of the forward tilting posture of the upper column 46. The operator can select the forward tilting posture of the upper column 46 according to the working conditions of the traveling machine body (rice transplanter), and the operability of the rice transplanter can be improved.

  It should be noted that the main clutch mechanism 35a of the traveling system is turned on and off and the transmission shaft 37 is braked on one side of the upper column 46 (on the left side of the machine body as viewed from the operator sitting on the seat body 17 in the embodiment). And a main shift lever 50 for switching the gear-type transmission mechanism 38 of the transmission case 2 to the forward two-stage, the neutral stage and the reverse one-stage. An elevating operation lever 51 (shown in FIG. 3) for driving a hydraulic cylinder 15 for elevating the seedling planting device 7 is disposed on the other side of the column 46 (in the embodiment, also on the right side of the machine body). These levers 49, 50, 51 are provided in association with each other so that the posture can be changed in the front-rear direction integrally with the upper column 46. That is, the base end portions of the levers 49 to 51 are attached to a bracket or the like provided near the outer periphery of the upper column 46 in a side view, and the free end sides of the operation levers 49 to 51 protrude from the outer surface of the movable cover body 25. Yes. Corresponding levers 49 to 51 are connected to wire operating means 80, 81, and 82 each composed of a flexible outer guide tube and inner wire (see FIGS. 6, 8, 9, and 13). ).

  More specifically, the main transmission lever 50 is disposed on the rear side facing the seat body 17 on the outer surface of the movable cover body 25. On the other hand, the base end portion of the composite lever 49 protrudes outward in the width direction of the traveling machine body from the left side surface of the movable cover body 25, and the protruding direction is as seen in a plan view (top view) as shown in FIG. The traveling machine body is appropriately deviated by an angle θ2 in the forward direction of the traveling machine body with respect to the reference line B in the width direction of the traveling machine body orthogonal to the center line A along the traveling direction of the traveling machine body. The free end side of the composite lever 49 is bent upward from the base end portion. Then, by rotating the free end side of the composite lever 49 in the front-rear direction of the traveling machine body, the main clutch mechanism 35a is turned on and off via the interlocking mechanism 100 described later, and the left and right front wheels 4a and both rear wheels 5a. The brake means 37a for applying braking is activated. When the free end side of the composite lever 49 faces the rear side of the traveling aircraft body, the free lever side of the composite lever 49 faces the front side of the traveling aircraft body, or when the composite lever 49 is operated in a substantially upright state, the composite lever 49 The free end (grip portion) is configured to approach the center line A by a dimension H2 (see FIG. 12).

  Further, in a plan view, when the free end side of the composite lever 49 faces the rear side of the traveling machine body, the free end side (grip part) of the composite lever 49 is outside the outermost peripheral edge of the steering handle 24 (radially outside). ) And the free end side of the composite lever 49 faces the front side of the traveling vehicle body or is substantially upright, the free end side (grip part) of the composite lever 49 has an inner diameter from the outermost peripheral edge of the steering handle 24. Set to be on the side.

  In the embodiment shown in FIGS. 13 to 16, when the free end side of the composite lever 49 faces the rear side of the traveling machine body, the main clutch mechanism 35a is in the engaged state and the brake means 37a is in the brake released state. When the free end side of the composite lever 49 is directed to the front side of the traveling machine body or is operated in a substantially upright state, the main clutch mechanism 35a is disengaged and the brake means 37a is in the braking state. Next, the interlocking mechanism 100 will be described. One end of the wire 81a in the wire operating means 81 is connected to the lower end of the arm 83 interlocking with the rotation of the base end portion of the composite lever 49 about the axis. As shown in FIGS. 13 to 16, the wire operating means 81 is routed to the rear side of the right side surface of the mission case. The other end of the wire 81a is connected to a bracket arm 85 fixed to one end of a rotating shaft 84 extending parallel to the reference line B on the upper surface of the mission case 2. A rotation arm 86 in the main clutch mechanism 35 a is attached to the other end of the rotation shaft 84, and a pressing wheel 87 that can be brought into contact with and separated from the belt 35 is provided at the front end of the rotation shaft 84. The pressing wheel 87 is configured to be pressed (clutched) on the outer periphery of the belt 35 by the urging force. The tip end side of the brake operation arm 91 is connected to the bracket arm 85 via a length adjusting bolt 89 and a coil spring 90. Thus, the interlocking mechanism 100 is configured.

  According to the above configuration, when the composite lever 49 is rotated in the forward direction of the traveling machine body, the wire 81a is pulled, and the rotating shaft 84 and the rotating arm 86 are rotated against the urging force of the torsion coil spring 88. Then, the pressing wheel 87 is separated from the outer periphery of the belt 35 so that the main clutch mechanism 35a is disengaged, and the rotation of the rotating shaft 84 causes the bracket arm 85, the length adjusting bolt 89, and the coil spring 90 to pass through. The brake operation arm 91 is activated, and the brake means 37a is held in the braking state. Conversely, when the composite lever 49 is rotated in the rearward direction of the traveling machine body, the wire 81a is loosened, the rotating arm 86 is rotated by the biasing force of the torsion coil spring 88, and the pressing wheel 87 is pressed against the outer periphery of the belt 35. The power transmission state is maintained from the output shaft pulley 33a of the engine 21 to the transmission case input shaft pulley 34a, and the brake means 37a is maintained in the brake release state.

  In the case of the operation mode of the composite lever 49 as described above, if the composite lever 49 is provided on the outer surface of the movable cover body 25 so as to move to the front of the traveling machine body as the upper column 46 is bent forward, When the operator descends to the ground and operates the steering handle 24 from the front of the traveling machine body during the work such as crossing over the bridge or changing the truck, the main clutch mechanism 35a is quickly turned off and the braking operation of the brake means 37a is performed quickly. There is an effect that it can be done reliably.

  When the mounting direction of the wire operating means 81 and the interlocking mechanism 100 is reversed and the composite lever 49 is rotated in the forward direction of the traveling machine body, the main clutch mechanism 35a is in a power transmission state and the brake means. 37a is held in a brake-released state, and when the composite lever 49 is rotated backward in the traveling body, the main clutch mechanism 35a is in a power transmission cut-off state, and the brake means 37a is in a brake state. Also good.

  Regardless of the operation mode of the composite lever 49, the shape of the front bonnet 19 is formed so that the width dimension along the width direction of the traveling body gradually decreases as it goes above the lower end of the front bonnet 19. A steering upper shaft 23 and an upper column 46 protrude from a substantially top portion of the front bonnet 19, and an operator sitting on a seat provided on the traveling machine body can perform a steering operation on the upper end of the steering upper shaft 23. A steering handle 24 is provided, and on one side of the front bonnet 19, a base end protrudes outward in the width direction of the traveling vehicle body from the outer peripheral surface of the front bonnet 19, and the free end side rotates in the front-rear direction of the traveling vehicle body The composite lever 49 is arranged so as to be operated, and the free end side of the composite lever 49 in the plan view (top view) When it is configured to move closer to the center in the width direction of the traveling machine body with respect to the steering upper shaft, the front deck side 16a on the side of the front bonnet 19 is walked, The legs, waist, etc. of the operator who performs the seed mat removal work from the outside seedling stand 18 do not hit the composite lever 49, and the composite lever 49 does not move accidentally and malfunctions. Problems such as bending and deformation of the composite lever 49 can also be solved.

  In particular, when the main clutch mechanism 35a is disengaged and the brake means 37a maintains the braking state when the turning operation is performed in the front direction of the traveling machine body, the vehicle is not inadvertently started in that state.

  In addition, if the structure in which the steering upper shaft 23 and the upper column 46 can be tilted forward of the traveling machine body is adopted, the composite lever can be used both when the operator is on the traveling machine body and when the operator descends the ground and operates the rice transplanter. There exists an effect that operation of 49 can be performed easily.

It is a side view of the riding type rice transplanter according to the present invention. It is a top view of a riding type rice transplanter. It is a perspective view of the traveling machine body in a state where a vehicle body cover or the like is removed. FIG. 3 is a left side view of a front part of a traveling machine body such as a transmission case, an engine, a front axle case, and a steering. It is a side view which shows the tilting state of an upper column. It is a perspective view which shows the interlock mechanism of a diff lock. It is a perspective view which shows the diff lock apparatus which cuts and shows the inside of a part of mission case, and its interlocking mechanism. It is a front view which shows the interlock mechanism of a tilt mechanism, an attitude | position holding means, and a differential lock | rock. It is a left view of a tilt mechanism. It is a perspective view of a tilt mechanism and a posture holding means. It is a partially notched top view which shows the internal mechanism of a mission case. It is a top view explaining arrangement | positioning and the operation range of a composite operation lever. It is the perspective view seen from the left side of the mission case which shows the interlock mechanism between a compound lever and a main clutch. It is a perspective view of the interlocking mechanism seen from the right side of a mission case. It is a perspective view of the interlocking mechanism seen from the lower right side of the mission case. It is a principal part expansion perspective view of an interlocking mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Main frame 1b Subframe 2 Mission case 3 Traveling frame 4 Front axle case 5 Rear axle case 7 Seedling planting device 9 PTO shaft 19 Front bonnet 19a Lower fixed cover body 20 Steering lower shaft 21 Engine 23 Steering upper shaft 24 Steering handle 29 Traveling Drive system 30 PTO drive system 31 Power transmission mechanism 35a Main clutch mechanism 37a Brake means 38 Gear-type transmission mechanism 40 Output shaft 41 Transmission shaft 45 Lower column 46 Upper column 47 Tilt mechanism 48 Posture holding mechanism 49 Composite lever 81 Wire operation means 81a Wire 83 Arm 84 Rotating shaft 85 Bracket arm 86 Rotating arm 87 Pressing wheel 88 Torsion coil spring 89 Length adjusting bolt 90 Coil spring 100 Interlocking mechanism

Claims (5)

In a riding type rice transplanter in which a power unit such as an engine is arranged at the front part of the traveling machine body and a seedling planting device is connected to the rear part of the traveling machine body so as to be movable up and down
The front bonnet that covers the engine is formed such that the width dimension along the width direction of the traveling body gradually decreases as it goes upward from the lower end of the front bonnet,
A steering handle that can be steered by an operator sitting on a seat provided on a traveling body is provided at the upper end of the steering upper shaft at a substantially top portion of the front bonnet.
An operation lever is arranged on one side of the front bonnet so that the base end protrudes outward in the width direction of the traveling vehicle body from the outer peripheral surface of the front bonnet, and the free end side rotates in the front-rear direction of the traveling vehicle body And
When viewed from above, when the free end side of the operating lever is rotated in the front direction of the traveling machine body, the operation lever is configured to approach the center of the traveling machine body in the width direction with respect to the steering upper shaft. Riding type rice transplanter.   When viewed from above, the free end of the operating lever when rotating in the front direction of the traveling machine body is positioned closer to the inner diameter side than the outermost diameter of the steering handle, while rotating in the rear direction of the traveling machine body The riding type rice transplanter according to claim 1, wherein a free end side of the operation lever when operated is set to be positioned outside an outermost diameter of the steering handle. The operation lever is for simultaneously executing a power transmission on / off operation from the engine and a braking operation of the traveling machine body,
When the operation lever is rotated in the front direction of the traveling machine body, the power transmission from the engine is cut off, and the braking operation of the traveling machine body is executed,
The power transmission from the engine is turned on when the operation lever is rotated in the rear direction of the traveling machine body, and the braking release operation of the traveling machine body is performed. The riding rice transplanter as described in 2.   The steering upper shaft is configured to be bent in the front-rear direction of the traveling machine body, and the operation lever is disposed on a cover body of the front bonnet that moves back and forth as the steering upper shaft bends. The riding type rice transplanter according to any one of Items 1 to 3.   The traveling machine body is provided with a deck portion through which an operator can pass on both right and left sides of the front bonnet, and a spare seedling stand is provided outside the traveling machine body from the deck portion. The riding type rice transplanter according to any one of 1 to 4.

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