JP2006254727A - Riding-type working implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding-type working implement so designed that the appearance of a front hood 19 surrounding at least an engine in front of the traveling machine body and the periphery of the hood is made better and the front hood 19 is easily fixed. <P>SOLUTION: The riding-type working implement is such that the front hood 19 surrounding the engine is provided with an opening 54 through which an upper column 46 is passed forward, and the top face plate 19a of the front hood 19 and a space above the cap body 53 of a fuel tank 22 are integratedly covered with a mobile cover body 25 moving together with the upper column 46, therefore no rain intrudes via a fuel feed port cylinder 22a. On inclining the upper column 46 forward, the mobile cover body 25 acts to automatically make the space above the cap 53 open, thus simplifying fuel replenishing operation. As the top plate 19a of the front hood 19 is held by the fuel feed port cylinder 22a and the cap body 53, the front hood 19 does not come off a vehicle body cover 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a riding-type working machine configured to selectively enable steering operation of a front wheel from above a traveling machine body and from the front of the traveling machine body, and more particularly to a configuration of a front bonnet. It is.

  Conventionally, during normal rice planting work, the operator can steer while riding on the traveling machine. In Patent Document 1, an engine and a transmission case are mounted on the rear side of a traveling machine body equipped with four wheels, and are erected on the front frame of the traveling machine body. The lower operating shaft 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, so that the front and rear tilt angle can be changed and the posture can be maintained. It is disclosed.

  And in the riding type agricultural working machine of Patent Document 1, a plurality of recesses are formed on the upper outer periphery of the fixed cam that is fixed at the lower end of the cylinder (column) in which the upper operation shaft is rotatably mounted and fixed in the vicinity of the tilt fulcrum. Is formed. On the other hand, a lever provided on the inner surface of a bonnet standing upright at the front of the traveling machine body so as to be vertically rotatable is biased downward by a spring, and a protrusion protruding downward on the lever is formed of the plurality of recesses. It can be selectively fitted into one, so that the forward tilt angle of the cylinder can be maintained in an appropriately changed posture. In addition, a long hole is formed in the bonnet in the front-rear direction of the traveling machine body through which the cylinder can pass.

On the other hand, in Patent Document 2, a fixed frame is erected on the front portion of a traveling machine body in a passenger work vehicle, and a support frame that pivotally supports a steering shaft on the other side via a tilt shaft that is lateral to the fixed frame. An opening is provided on the upper surface of the front bonnet that surrounds the fixed frame and the tilt shaft, and a movable cover body whose lower end fits into the opening can be moved back and forth integrally with the steering shaft. Such a mounting arrangement is disclosed.
Japanese Patent Publication No. 2574680 (refer to FIGS. 1, 4 and 5) Japanese Patent Laid-Open No. 09-132150 (see FIGS. 7, 8, and 14)

  However, according to the configuration of Patent Document 1, a part of the front and rear elongated holes formed in the bonnet (portion where the cylinder does not exist) remains exposed during normal travel (during operation). It was bad, and there was a problem that dust, mud, and rain easily entered the inside.

  On the other hand, according to the configuration of Patent Document 2, most of the opening in the front bonnet is covered with the movable cover body, but the lower end of the movable cover body is fitted into the front bonnet through the opening. Because of the arrangement, the gap between the opening and the movable cover body can still be seen from the outside, the appearance is not good, and the problem that dirt, mud, and rain easily enter the inside cannot be solved.

  In addition, when an engine or fuel tank is built in on the inner diameter side of the front bonnet, the fuel supply port cylinder in the fuel tank and the cap body for closing the port are usually placed on the outer surface of the front bonnet so that fuel can be easily supplied. Since they are arranged so as to protrude, special measures have been required to prevent rain from entering from the gap between the fuel supply port tube and the cap body. Furthermore, as a means for fixing the front bonnet, if screws or bolts are fastened to the frame or the like from the outer surface of the front bonnet, many screws or bolts are required, and the heads of the screws or bolts are attached to the outer surface of the front bonnet. There was also a problem that it looked bad because it protruded.

  The present invention has been made to solve the above-described conventional problems, and the front bonnet and its peripheral members have a good appearance, and the structure of the fuel supply port cylinder and the cap body for closing the port is also provided. It is an object of the present invention to provide a riding type work machine that can be simplified and can easily maintain an engine in a front bonnet.

  In order to achieve the object, the invention according to claim 1 is a riding type work machine in which a power unit such as an engine is disposed in a front part of a traveling machine body, and the front part of the traveling machine body is located on a front side of a position where the engine is disposed. A steering wheel shaft for steering the front wheels and an upper column provided with a handle are connected to be able to bend in the front-rear direction of the traveling machine body so that they can be selectively operated on the traveling machine body and in front of the traveling machine body. A front bonnet that covers the engine and the fuel tank is provided with an opening through which the upper column can pass forward, and a fuel supply port cylinder of the fuel tank is provided on an upper surface plate of the front bonnet adjacent to the opening. The upper column is provided with a movable cover body so as to move back and forth integrally with the upper column. The movable cover body is configured such that the upper column tilts backward. When, in which it is formed so as to cover a part of the upper at least the opening of the cap body for closing the fuel supply port cylinder.

  According to a second aspect of the present invention, in the riding type working machine according to the first aspect, the front bonnet cannot be detached by sandwiching the upper surface plate portion between the fuel supply port tube and a cap body that closes the fuel supply port tube. It is composed.

  According to a third aspect of the present invention, in the riding-type work machine according to the first or second aspect, a display portion that shows a remaining amount of fuel is provided on a side surface of the fuel tank, and the display portion is formed in a front bonnet. It is the one that faced the opened window hole.

  According to a fourth aspect of the present invention, in the riding work machine according to any one of the first to third aspects, a lower end of the front bonnet is provided on a step plate that is an upper surface of the traveling machine body and supports the front bonnet. A guide groove into which an edge is fitted is formed, and a locking hole is formed in the guide groove so that an engaging projection piece protruding from a lower end edge of the front bonnet can be locked.

  According to a fifth aspect of the present invention, in the riding work machine according to any one of the first to fourth aspects, the upper column is provided with an adjustment unit for operating the work machine, below the movable cover body. On the other hand, the adjustment part of the engine is arranged in the inner diameter part from the front bonnet.

  According to the first aspect of the present invention, the movable cover body that moves back and forth integrally with the upper column can integrally cover the upper surface plate of the front bonnet and the cap body of the fuel tank. There is no need for a special mechanism for preventing rain from entering between the mouthpiece and the cap body. Further, since the fuel supply port cylinder and the cap body are not always exposed on the outer surface of the front bonnet, the appearance of the front bonnet is good. When fuel is supplied to the fuel tank, the upper cover is tilted forward so that the movable cover body can automatically open above the cap body, so that the fuel supply operation can be simplified.

  According to the second aspect of the present invention, the front bonnet is fixed by the fuel supply port cylinder and the cap body that closes the fuel supply port cylinder so that the front bonnet cannot be detached. There is an effect that a separate part is not required.

  According to the third aspect of the present invention, the side of the fuel tank is provided with a display portion that shows the remaining amount of fuel, and the display portion faces the window hole formed in the front bonnet. The remaining fuel amount can be easily confirmed without shifting the movable cover body.

  According to the fourth aspect of the present invention, the step plate that is the upper surface of the traveling machine body and supports the front bonnet is formed with a guide groove into which a lower end edge of the front bonnet is fitted, and the guide groove The front bonnet which is fixed so as not to move upward by the cap body is not displaced because the engagement hole for engaging the engagement projection piece protruding from the lower edge of the front bonnet is formed. There is an effect.

  According to the fifth aspect of the present invention, when the upper column is largely tilted forward, the opening in the front bonnet can be greatly opened, so that the adjustment of the adjustment unit for operation of the work implement can be performed without removing the front bonnet. In addition, there is an effect that the replacement / adjustment work of the adjusting portion of the engine can be easily performed.

  Next, the best embodiment when the present invention is applied to a riding type rice transplanter 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 showing a traveling body of the riding type rice transplanter, FIG. 4 is a side view of the front part of the traveling body, and FIGS. FIG. 9 is a front perspective view of the front bonnet, FIG. 10 is a side view showing the tilt position of the steering handle, and FIG. 11 is an opening of the front bonnet with the movable cover body and the auxiliary cover body removed. FIG. 12 is a perspective view seen from below with the movable cover body and the auxiliary cover body attached to the upper column, FIG. 13 is a perspective view showing the components arranged around the upper column, and FIG. Is a side view showing components arranged around the upper column, FIG. 15 is a perspective view showing a tilt mechanism and a posture holding means, FIG. 16 is a cross-sectional view showing a fixing portion of the front bonnet, and FIG. Fit FIG. 18 is an enlarged sectional view taken along the line XVIII-XVIII in FIG. 16, FIG. 19 is a plan view showing the inside of the opening of the front bonnet, and FIG. 20 is an upright view of the upper column. It is a top view which shows the inside of the opening part of a front bonnet in the state made into.

  As shown in FIG. 1 to FIG. 3, the traveling machine body in the four-row planted rice transplanter of this embodiment includes a main frame 1 composed of a pair of left and right frames that are long in the front-rear direction, and the main frame 1. It consists of a transmission case 2 formed of an integral case body that is long in the front-rear direction and a transmission section frame 3 having a U-shaped cross section that is connected to the rear thereof.

  The mission case 2 made of aluminum alloy or the like is obtained by integrating a divided case divided into left and right sides of a traveling machine body by bolting the housing into an internal mechanism. A front axle case 4 protrudes from the left and right sides 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 transmission part 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 to 3).

  A seedling planting device 7 is connected to the rear end of the main frame 1 through a parallel link mechanism 6 composed of upper and lower links so as to be movable 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 10 from a PTO shaft 9 projecting to the rear end of the mission case 2, and an upper end. Are attached to both the left and right sides of each planting transmission case 11, a seedling stage 12 that is forwardly inclined so as to approach the rear part of the traveling machine body, a float 13 that is disposed on the lower surface of each planting transmission case 11, And a planting mechanism 14 with a planting claw for planting the seedling mat on the seedling platform 12 while dividing it up and down and planting it one by one. And the raising / lowering hydraulic cylinder 15 provided in the rear end of the main frame 1 is attached in connection with the parallel link mechanism 6, and can raise / lower the seedling planting apparatus 7 largely.

  A seat body 17 can be horizontally rotated on a seat support shaft (not shown) erected from the main frame 1 on a synthetic resin vehicle body cover 16 attached so as to cover the main frame 1 from above. It is attached to. In front of it, a front bonnet (engine hood) 19 is fixed and erected on the upper surface of the vehicle body cover 16.

  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 FIGS. 7 and 8). The mission case 2 is formed with a step 2a 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 (see FIG. 7). The foot of the flat engine support member 32 straddling the left and right on the upper surface of the mission case 2 is bolted to the step 2a on the lower side (see FIGS. 4 and 6). A base portion (crankcase portion) 21a of the engine 21 is fixed to the engine support member 32, and the cylinder case 21b side of the engine 21 is inclined so as to face upward. The engine 21 may be fixed upright. Pulley belts 33a, 34a, 35, which are conventionally known belt transmission mechanisms with a slack adjusting 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. To transmit power from the input shaft 34 to the power transmission mechanism 31.

  The power transmission mechanism 31 includes a main clutch 36 that turns on / off power transmission from the input shaft 34, a brake mechanism 37, a gear-type transmission mechanism 38 that changes the rotational speed, and a front axle shaft 39 with a differential mechanism 39a. An output shaft 41 as a traveling drive system from the gear-type transmission mechanism 38 to the rear wheels to which power is transmitted through the chain transmission mechanism 40, and a rear end of the transmission case 2 from the gear-type transmission mechanism 38 through the PTO clutch 42. And a PTO shaft 9 projecting rearwardly (see FIGS. 7 and 8). The chain transmission mechanism 43 that transmits power from the output shaft 41 to the rear axle case 5 is disposed on the inner diameter portion of the transmission section frame 3 (see FIGS. 1 and 4). 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.

  A steering link mechanism 44 such as a pitman arm 44a, a connecting rod, and a tie rod for changing 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 (FIGS. 4, 6, and FIG. 7).

  Next, the structure of the front bonnet (engine hood) 19 made of synthetic resin (or glass fiber reinforced plastic) and the structure to be fixed will be described. As shown in FIGS. 16, 17, and 19, a substantially U-shaped opening 54 that is notched from the upper surface side to the front end of the front bonnet 19 in a plan view. It is formed (see FIGS. 11, 16, and 19). A plurality of engaging protrusions 66 are integrally formed downward at the lower edge of the front bonnet 19 at appropriate intervals (see FIG. 16). On the other hand, as shown in FIGS. 17 and 18, components such as the engine 21 and the lower column 45 for steering are arranged in the step portion 16 a extending from the left and right side portions of the traveling machine body to the front end in the vehicle body cover body 16. In order to mount the front bonnet 19 so as to surround the large-diameter hole 67, an upward rib 67a is integrally formed on the periphery of the large-diameter hole 67, and A mounting groove 68 in which the entire lower end edge of the front bonnet 19 is fitted downward is formed in the outer peripheral portion of the rib 67a. The mounting groove 68 is formed with a locking hole 69 for locking each of the engaging protrusions 66. With this configuration, the lower end of the front bonnet 19 can be mounted without being displaced with respect to the vehicle body cover 16.

  Inside the front bonnet 19, the fuel tank 22 is fixed on the portal frame 52 erected from the main frame 1 near the rear part. A fuel supply port cylinder 22 a that opens to the upper surface of the fuel tank 22 faces upward from a mounting hole 19 b that is formed in the upper surface plate portion 19 a of the front bonnet 19. Then, the upper plate 19a of the front bonnet 19 in the vicinity of the mounting hole 19b is sandwiched between the screw-type cap body 53 for opening and closing the fuel supply port cylinder and the stepped portion of the fuel supply port cylinder 22a larger than the diameter of the mounting hole 19b. By pressing, the front bonnet 19 cannot be moved upward (see FIGS. 11 and 16). The rear surface of the fuel tank 22 is provided with a vertically long display portion 22b that can display the remaining amount of fuel, and the display portion 22b is exposed to a window hole 19c formed in the rear surface of the front bonnet 19. The remaining fuel amount can be easily confirmed by an operator sitting on the seat body 17 (see FIG. 16). In that case, at least the display portion 22b in the fuel tank 22 may be formed of a transparent or translucent member, or the entire fuel tank 22 may be formed of a translucent synthetic resin material.

  In the space inside the front bonnet 19 below the fuel tank 22, there are a four-cycle air-cooled engine 21 and its accessories 56, such as a carburetor, speed governor, air muffler, starter coiler (rope starter), silencer, etc. Is arranged.

  Next, the upper column 46 can be selectively bent in the front-rear direction to a rear position where the steering handle (round handle) 24 at the upper end of the upper column 46 faces the steering seat body 17 and a position on the front side of the traveling machine body. The tilt mechanism that performs this will be described.

  A steering lower shaft 20 that is also erected from the mission 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 mission case 2 located in the front part of the front bonnet 19. . An upper end of the steering lower shaft 20 and a lower end of the handle shaft 23 having a steering handle (round handle) 24 attached to the upper end are connected via a universal joint 27 so as to be bent. The handle shaft 23 is rotatably mounted in the upper column 46. Further, the upper end of the lower column 45 and the lower end of the cylindrical upper column 46 are connected via a tilt mechanism 47 so as to be able to tilt in the front-rear direction. Posture holding means 48 for holding the posture is provided (see FIGS. 4 to 6, 10, and 12 to 15).

  The tilt mechanism 47 rotates a pair of left and right lower brackets 47a fixed to the upper end of the lower column 45 and a pair of left and right upper brackets 47b fixed to the lower end of the outer periphery of the upper column 46 via a pivot shaft 47c. It is the structure connected so that movement was possible (refer FIGS. 12-14).

  The posture holding means (posture adjusting means in the claims) 48 has a plurality of (three in the embodiment) locking grooves formed in a recessed manner at positions appropriately separated from each other in the arcuate upper end surface of the lower bracket 47a. 55, a horizontal shaft 48a pivotally supported on the rear end piece 47d of the upper bracket 47b, an engagement hook 48b fixed to one end of the horizontal shaft 48a, and a wound around the horizontal shaft 48a. And a biasing spring 48c that biases the engagement hook 48b downward. When the upper column 46 is changed to a predetermined rearward tilt or forward tilt angle, the engagement hook 48b has a plurality of positions of the locking grooves 55. By selectively engaging any one of them, the tilting posture of the upper column 46 can be adjusted and held (FIGS. 12 to 15). In the embodiment, as shown in FIG. 10, the first column I in which the upper column 46 is inclined rearward (approximately 30 degrees clockwise relative 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 opening 54 that is substantially U-shaped in plan view is connected to the movable cover body 25 that moves back and forth integrally with the upper column 46 and is pivotable upward. It is covered with the auxiliary cover body 26. The movable cover body 25 and the auxiliary cover body 26 are made of synthetic resin or glass fiber reinforced plastic, like the front bonnet 19. Further, in the first posture I, the rear portion of the movable cover body 25 is formed so as to integrally cover the upper surface plate 19a of the front bonnet 19 and the cap body 53 of the fuel tank 22, so that the fuel supply A special mechanism for preventing rain from entering between the mouthpiece 22a and the cap body 53 is not required. Further, since the fuel supply port cylinder 22a and the cap body 53 are not always exposed on the outer surface of the front bonnet 19, the appearance of the front bonnet 19 is good. When refueling the fuel tank 22, the movable cover body 25 can automatically open above the cap body 53 by tilting the upper column 46 forward to about the second posture II (see FIG. 20). Refueling can be done easily.

  Since the upper surface plate portion 19a of the front bonnet 19 is sandwiched between the fuel supply port cylinder 22a on the upper surface of the fuel tank 22 and the cap body 53, the front bonnet 19 does not come off from the vehicle body cover 16, and the vehicle body cover Since the engagement protrusion 66 on the lower end edge of the front bonnet 19 is engaged with the engagement hole 69 formed in the 16, even if there is vibration during traveling, the front bonnet 19 is in contact with the vehicle body cover 16. There is an effect that the mounting position does not shift.

  The auxiliary cover body 26 is provided so as to be vertically rotatable around the front end side of the movable cover body 25. That is, as shown in FIGS. 11 to 14, a support pipe 57 a is fixed laterally at the tip of a support bracket member 57 that protrudes upward from the lower portion of the upper column 46. On the other hand, a pair of left and right shaft portions 58a of a reinforcing and operating member 58 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 57a. .

  The operation member 58 is associated as an operation unit of the posture holding means 48. That is, as shown in FIGS. 12 to 14, the other end of the link 60 rotatably connected to the pin 58 b protruding from the shaft portion 58 a of the operation member 58 at the eccentric position is integrated with the engagement hook 48 b. It is rotatably connected to the tip of an arm 59 fixed to the other end of the horizontally rotating horizontal shaft 48a. The urging force of the urging spring 48 c urges the auxiliary cover body 26 and thus the lower end side of the operation member 58 to approach the surface of the front bonnet 19 and close it.

  In the present embodiment, as shown in FIG. 15, a plurality of positions (in the embodiment, 3) are formed by recessing on the outer peripheral surface of the lower bracket 47 a from the horizontal shaft 48 a that is the center of rotation of the engaging hook 8 b as a tilt. Since the distance to the bottom surface of the locking groove 55 is set to increase sequentially, the tip of the engaging hook 48b is engaged with the first locking groove 55 (position near the rear portion of the traveling machine body). When the auxiliary cover body 26 (operation member 58) is engaged with the second locking groove 55 at the center in the front-rear direction rather than the downward angle of the auxiliary cover body 26 (operation member 58), ) Is in a posture in which the lower end protrudes forward of the traveling vehicle body (an attitude that is separated from the opening 54 of the front bonnet 19) and engages with the third locking groove 55 at a position closer to the front portion of the traveling vehicle body. The auxiliary cover body 26 (operation part) 58) will position (greatly apart from that posture from the opening 54 of the front hood 19) whose lower end is greatly protruded forwardly of the traveling machine body (see FIG. 10).

  When the upper column 46 is in the first posture I, the auxiliary cover body 26 is in a substantially vertical posture on the front end side of the opening 54 of the front bonnet 19 as shown by a two-dot chain line in FIG. In the side view of the machine, 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 greatly separated from the steering handle 24 (see FIG. 10).

  Accordingly, when the auxiliary cover body 26 and thus the lower end side of the operation member 58 are rotated upward by a predetermined angle so as to be separated from the surface of the front bonnet 19, the link 60 and the arm 59 are resisted against the urging force of the urging spring 48c. Since the tip of the engagement hook 48b is pivoted (unlocked) so as to be disengaged from the locking groove 55, the operator removes his / her hand from the auxiliary cover body 26 and then the operator handles the steering handle 24. Can be shifted from the first posture I to the second posture II. Further, in order to move to the third posture III, the auxiliary cover body 26 (operation member 58) is again turned upward by a predetermined angle to unlock, and then the steering handle 24 is tilted forward. In this way, the upper column 46 can be largely tilted forward in a stepwise manner in front of the traveling machine body.

  Since the operation of tilting the upper column 46 forward is possible only when the operator is located on the ground in front of the traveling aircraft, in other words, the operator can tilt the vehicle while riding on the traveling aircraft. Since this is impossible, there is no inconvenience due to erroneous operation, and the reliability and safety of ground operation can be ensured.

  The operator can steer the riding type rice transplanter while boarding the traveling machine body, and the operator who descends from the traveling machine body to the ground holds the steering handle 24 while being positioned in front of the traveling machine body. It is possible to move the rice transplanter over the field or put it on a truck.

  Furthermore, since the auxiliary cover body 26 is provided at the front end portion of the movable cover body 25, it is even easier for the operator descending on 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 are formed so as to completely cover the opening 54 of the front bonnet 19. Therefore, air resistance during traveling can be reduced, and rain and dust do not enter the front bonnet 19.

  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), the main clutch lever 49 of the traveling system and the gear type speed change mechanism 38 of the transmission case 2 are moved forward two stages and neutral stages. A main transmission lever 50 for switching to the first reverse gear is disposed, and a hydraulic cylinder 15 for raising and lowering the seedling planting device 7 is provided on the other side of the upper column 46 (also in the embodiment, on the right side of the machine body). The lift operation lever 51 to be driven is arranged, and these levers 49 to 51 are provided in association with the upper column 46 so that the posture can be changed in the front-rear direction. That is, the bases of the levers 49 to 51 are attached to a bracket 61 provided near the outer periphery of the upper column 46 in a side view. Corresponding levers 49 to 51 are connected to wire operating means 62, 63, and 64 each composed of a flexible outer guide tube and inner wire (see FIGS. 12 to 14). The operation unit on the mission case 2 side is not shown. And the front-end | tip part (operator's grip part) side of each lever 49-51 is located in the outer surface of the movable cover body 25. FIG.

  An engine stop switch 65 for emergency stop of the engine 21 is also provided in association with the upper column 46 so as to move back and forth integrally with the upper column 46. As one embodiment thereof, on one side outer surface (in the embodiment, the right side of the machine body as viewed from the operator sitting on the seat body 17) along the front-rear movement direction of the movable cover body 25 that moves integrally with the upper column 46, An engine stop switch 65 is provided, and the push button 65a is provided so as to protrude (expose) the outer surface of the movable cover body 25 (see FIGS. 9, 10 and 12). By pushing or hitting the push button 65a, the electric system related to the engine 21 is cut and the engine 21 can be stopped quickly.

  With this configuration, the engine stop switch 65 can be operated both when the operator is on the traveling machine body and when the operator descending from the traveling machine body is standing in front of the riding rice transplanter. The type rice transplanter can be operated safely (see FIG. 10).

  In the upper column 46, below the movable cover body 25, wire operating means 62 associated with the main clutch lever 49, the main transmission lever 50, and the lifting operation lever 51 as an adjustment unit for operating the work machine. 63, 64 are arranged on the inner diameter portion of the front bonnet 19, the carburetor, the speed governor, the air muffler, the starter coiler (rope starter) which are the adjusting portion or accessory 56 of the engine 21, Since the silencer and the like are arranged, when the upper column 46 is tilted forward to the third posture III (see FIG. 19), the opening 54 can be opened widely, so that the front bonnet 19 is removed from the vehicle body cover 16. In addition, the wire operating means 62, 63, 64 can be adjusted and the accessory 56 can be exchanged / adjusted.

  A push button 65a is provided on one side outer surface (in the embodiment, the right side) of both side outer surfaces along the front-rear movement direction of the movable cover body 25 with the upper column 46 interposed therebetween, and the other side outer surface (in the embodiment, By providing the main clutch lever 49 on the left side), the operator can stop traveling and stop the engine without hesitation.

  It goes without saying that the present invention can be applied not only to a riding type rice transplanter but also to a riding type management machine, a transport vehicle, and the like.

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 which shows the whole structure of a traveling body. It is a side view which shows the structure of the front part of a traveling body. It is the perspective view seen from the front left of the traveling body with the transmission case, the engine, and the handle attached. It is a perspective view which shows the attachment state of a mission case, an engine, a front axle case, and a steering mechanism. It is a side view which shows the internal mechanism of a mission case. It is a top view which shows the internal mechanism of a mission case. It is a front perspective view of a front bonnet. It is a side view which shows the position of the tilt of a steering handle. It is a perspective view which shows the opening part of the front bonnet of the state which removed the movable cover body and the auxiliary cover body. It is the perspective view seen from the bottom of the state where the movable cover body and the auxiliary cover body were attached to the upper column. It is a perspective view which shows the components arrange | positioned around the upper column. It is a side view which shows the components arrange | positioned around the upper column. It is a top view which shows a tilt mechanism and an attitude | position holding means. It is sectional drawing which shows the fixing | fixed part of a front bonnet. It is a top view of the front part of the body cover which shows the position where the lower end of a front bonnet fits. FIG. 17 is an enlarged sectional view taken along line XVIII-XVIII in FIG. 16. It is a top view which shows the inside of the opening part of a front bonnet. It is a top view which shows the inside of the opening part of a front bonnet in the state which made the upper column the substantially upright state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main frame 2 Mission case 7 Seedling planting device 16 Body cover 19 Front bonnet 19a Top plate 19b Mounting hole 20 Steering lower shaft 21 Engine 22 Fuel tank 22a Fuel supply port cylinder 23 Handle shaft 24 Steering handle 25 Movable cover body 26 Auxiliary cover body 45 Lower column 46 Upper column 47 Tilt mechanism 48 Posture holding means (posture adjusting means)
48a Horizontal shaft 48b Engagement hook 48c Biasing spring 53 Cap body 66 Engagement protrusion 68 Mounting groove 69 Locking hole

Claims (5)

In a riding type work machine in which a power unit such as an engine is arranged at the front of the traveling machine
An upper column having a steering wheel shaft and a steering wheel for steering the front wheels is connected to the front part of the traveling machine body so as to be bent in the front-rear direction of the traveling machine body and on the traveling machine body. The front bonnet that covers at least the engine and the fuel tank is provided with an opening through which the upper column can pass forward,
The upper bonnet of the front bonnet adjacent to the opening is provided with a mounting hole for fitting the fuel supply port tube of the fuel tank,
The upper column is provided with a movable cover body so as to move back and forth integrally therewith,
The movable cover body is formed to cover an upper part of a cap body that closes the fuel supply port cylinder and at least a part of the opening when the upper column is in a backward tilted posture. Mold work machine.   The riding type work machine according to claim 1, wherein the front bonnet is configured not to be detached by sandwiching the upper surface plate portion between the fuel supply port tube and a cap body that closes the fuel supply port tube.   The riding type work according to claim 1 or 2, wherein a display portion on which a fuel remaining amount can be seen is provided on a side surface of the fuel tank, and the display portion faces a window hole formed in a front bonnet. Machine.   A guide plate on the upper surface of the traveling machine body that supports the front bonnet is formed with a guide groove into which the lower end edge of the front bonnet is fitted, and the guide groove projects from the lower end edge of the front bonnet. The riding type work machine according to any one of claims 1 to 3, wherein a locking hole capable of locking the engaging projection piece is formed.   The upper column is provided with an adjustment portion for operating the work machine below the movable cover body, and an adjustment portion for the engine is disposed on an inner diameter portion of the front bonnet. The riding type work machine according to any one of claims 1 to 4.

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