JP2005225343A - Riding working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a traveling working vehicle of a high floor type in which the traveling stability is enhanced while using components of a conventional working vehicle of standard specification. <P>SOLUTION: Front wheel transmission shaft cases 3 and 3, and rear wheel transmission shaft cases 5 and 5 are continuously provided from right and left sides of a transmission case 2 of a traveling unit 10 via transmission gear cases 50 and 50 and transmission shaft cases 6 and 6. The front wheel transmission shaft case 3 comprises a transverse extension case 3a, a transmission case 3b fixed to an outer end of the transverse extension case 3a, a longitudinal extension case 3c fixed to a lower portion of the transmission case 3b, and a turning case 3d which is fixed to a lower portion of the longitudinal extension case 3c to support front wheels 4. The transverse extension case 3a is mounted on the transmission case 2 so that the axial direction of a king pin 49 to be supported by the wheel transmission shaft case 3 is protruded forward downwardly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a transmission case that supports a transmission shaft that transmits power from a transmission case to a front wheel and a rear wheel of a small four-wheeled work vehicle. TECHNICAL FIELD The present invention relates to a transmission case technology for front and rear wheel support parts of a high clearance type (high floor type) four-wheel riding management machine with a raised height.

  Conventionally, a transmission case is fixed to the front part of the lower frame of a small passenger work vehicle, and power is transmitted from the engine to the transmission case to change speed. 2. Description of the Related Art Work vehicles configured to drive front wheels and rear wheels from a wheel transmission shaft case) are known.

The four-wheel work vehicle projects a front wheel transmission shaft case laterally from the front part of the transmission case, and the case supporting the king pin of the front wheel transmission case is arranged in the vertical direction when viewed from the side. Also, power is transmitted from the side of the transmission case to the rear axle case via the transmission shaft to drive the rear wheels, and the transmission shaft is arranged in the horizontal direction in the front and rear, and the rear axle case is tilted forward. It was arranged. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 10-316015

  Such a work vehicle is called a standard specification and has a low vehicle height and high stability, but when it is made a high floor type so that it can work across ridges, it remains the standard specification. If the transmission case is simply added and raised, the strength is insufficient, and the transmission case may be broken or bent in the middle. Further, when the height is increased as it is, the wheel base becomes the same, so the running stability is also lowered.

  The present invention intends to provide a traveling work vehicle with high traveling stability by using parts of a conventional standard working vehicle as much as possible when constructing an elevated floor traveling work vehicle.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  That is, in claim 1, the transmission case 2 is arranged at the front left and right center of the traveling unit 10, and the front wheel transmission shaft cases 3, 3, the transmission gear cases 50, 50, and the transmission are transmitted from the left and right sides of the transmission case 2 A four-wheel riding work vehicle in which rear wheel transmission shaft cases 5 and 5 are connected through shaft cases 6 and 6 to transmit power to and support front wheels 4 and 4 and rear wheels 7 and 7. The front wheel transmission via a lateral extension case 3a provided in the horizontal direction with respect to the transmission case 2 so that the axis of the king pin 49 supported in the front wheel transmission shaft case 3 is inclined forward and downward in a side view. The shaft case 3 is attached.

In the second aspect, the transmission shaft case 6 is attached to the transmission case 2 via the transmission extension case 61, and the transmission shaft case 6 is attached so as to be inclined downward and rearward from the horizontal.
In claim 3, the front wheel transmission shaft case 3 is laterally extended case 3a, a transmission case 3b fixed to the outer end of the horizontal extension case 3a, and a vertical extension case fixed to the lower part of the transmission case 3b. 3c and a rotating case 3d that supports the front wheel 4 while being fixed to the lower portion of the longitudinally extending case 3c. A left and right reinforcing frame 43 is interposed between the laterally extending case 3a and the vertically extending case 3c, A front and rear reinforcing frame 48 is interposed between the case 3 c and the transmission shaft case 6.

  In claim 4, the intermediate link that converts the front-rear motion in the front wheel steering mechanism 30 that transmits the rotational motion of the handle 29 to the front wheel 4 via the handle shaft, gear, rod, link, knuckle arm 47, etc., into left-right motion. 70 is pivotally supported on the laterally extending case 3a.

In Claim 5, the transmission case 2 is arrange | positioned in the center of the front part right and left of the traveling part 10, front wheel transmission shaft cases 3 and 3, transmission gear cases 50 and 50, and transmission shaft case from the right and left sides of the transmission case 2 A four-wheeled work vehicle for supporting and transmitting the power to the front wheels 4 and 4 and the rear wheels 7 and 7 by connecting the rear wheel transmission shaft cases 5 and 5 via 6 and 6; The transmission shaft case is divided in half, and one is a frame and the other is a cover.
Further, in claim 6, the transmission case 2 is arranged at the front left and right center of the traveling unit 10, and the front wheel transmission shaft cases 3, 3, the transmission gear cases 50, 50, and the transmission are transmitted from the left and right sides of the transmission case 2 A four-wheel riding work vehicle in which rear wheel transmission shaft cases 5 and 5 are connected through shaft cases 6 and 6 to transmit power to and support front wheels 4 and 4 and rear wheels 7 and 7. The extension cases 3a and 61 are arranged between the transmission case 2 and the transmission cases 3b and 50 to widen the left and right front wheels 4 and 4 and the rear wheels 7 and 7, and on both sides of the extension cases 3a and 61. The flange to be arranged is provided with angle adjusting means.

As effects of the present invention, the following effects can be obtained.
By configuring as in claim 1, the front wheel 4 can be disposed forward of the conventional one, the foil base can be lengthened, and the stability can be enhanced.
By configuring as in claim 2, the conventional rear wheel transmission shaft case of the standard specification can be specified as it is, and the cost can be reduced by sharing the parts. Moreover, the rear wheel transmission case of the conventional standard specification can be made to stand in the vertical direction, and the transmission shaft case can be arranged at a high position, so that it is difficult to hit the crop.

According to the third aspect of the present invention, the truss structure can be formed by the laterally extending case 3a, the vertically extending case 3c, and the left and right reinforcing frames 43, the rigidity can be increased, and the structure can be firmly connected and fixed against the lateral tilt. it can. Further, the longitudinally extending case 3c, the transmission shaft case 6, and the front / rear reinforcing frame 48 can constitute a truss structure to increase rigidity, and can be firmly connected and fixed against a front-back tilt.
By configuring as in claim 4, the intermediate link can be used, so that the conventional standard specification front wheel steering mechanism can be used as it is, the cost can be reduced, and the tread change can be easily handled. can do.

By configuring as in claim 5, maintenance of the transmission shaft can be easily performed by removing the cover, and the rear wheel can be supported by using the frame. It is possible to simplify, reduce the number of parts, and reduce costs.
Further, when the extension case is attached to the transmission case or the transmission case, the angle can be changed from the standard specification to the high floor specification simply by changing the attachment angle of the flange portion. The standard specification and high floor specification parts can be shared, and the cost can be reduced. Further, the angle changing means of the flange can easily change the angle by changing the bolt hole, and by making the flange according to the specification easy, the angle can be easily changed by selecting the flange.

Next, embodiments of the invention will be described.
1 is an overall side view of a passenger work vehicle according to the present invention, FIG. 2 is a plan view of a fuselage frame and a transmission shaft case, FIG. 3 is a side view, FIG. 4 is a rear view, and FIG. FIG. 6 is a lower perspective view of the front wheel transmission shaft case and the front wheel steering mechanism, FIG. 7 is a perspective view of the transmission shaft case portion, FIG. 8 is an overall side view of the passenger work vehicle without the side frame, and FIG. Is a rear view of the mounting table on the rear wheel support frame, FIG. 10 is a plan view of the front wheel steering mechanism, FIG. 11 is a perspective view of the auxiliary frame provided with a locking body, and FIG. FIG. 13 is a plan view of an embodiment in which the boom of the spraying device is divided into three parts, and FIG. 14 is a plan view of the example in which the boom of the spraying device is divided into four parts.

First, an overall configuration will be described with reference to FIG. 1 using a four-wheel riding management machine as an example of the passenger work vehicle of the present invention.
The riding management machine according to the present invention is provided with a work implement mounting device 17 at the rear portion of the traveling unit 10 capable of self-propelling, and various work implements can be mounted on the work implement mounting device 17. The working machine mounting device 17 pivotally supports a lifting link 11 on a lower frame 21 to be described later, and a hitch 18 is mounted on the rear part of the lifting link 11. In this embodiment, the working tank is supported by the hitch 18 as a working machine. A frame 13 is attached. A hydraulic cylinder 14 is interposed between the lifting link 11 and the body frame 20 so that the working machine can be raised and lowered. A control work machine 8 is attached to the front of the traveling unit 10 and communicates with the chemical tank 12 through a hose (not shown).

  The traveling unit 10 has a transmission case 2 disposed at a substantially central portion in the front, rear, left, and right on the body frame 20, and front wheel transmission shaft cases (front axle cases) 3 and 3 are respectively disposed on the left and right sides of the front of the transmission case 2. The front wheels 4 and 4 are attached to the outer ends of the front wheel transmission shaft cases 3 and 3 via the front axles 4a and 4a. A cross frame 19 is provided laterally on the left and right sides of the rear part of the body frame 20, and rear wheel transmission shaft cases (rear axle cases) 5 and 5 are provided on the outer ends of the cross frame 19, respectively. -Rear wheels 7 and 7 are attached to 5 via rear axles 7a and 7a, and between the left and right sides of the transmission case 2 and the left and right rear wheel transmission shaft cases 5 and 5, respectively, A vehicle body support structure is configured by interposing the frames 16 and 16.

  An operation unit 9 is provided on the front part of the body frame 20, and an engine 24 is disposed on the rear part and covered with a bonnet 25. The engine 24 is disposed at the rear of the mission case 2 above the cross frame 19 and inside an outer peripheral frame 22 described later. Both sides of the bonnet 25 and the front thereof are covered with side covers 31. A fuel tank 27 is disposed below the engine 24, and the power is transmitted from the output shaft of the engine 24 to the transmission in the transmission case 2 via power transmission means such as a belt, and power transmission means such as a belt or a chain is transmitted. In this configuration, power is transmitted to the PTO shaft 15 disposed at the rear.

  As shown in FIGS. 1 to 3, the body frame 20 is composed of a lower frame 21, an outer peripheral frame 22, and an auxiliary frame 23. The front portion is low and is positioned in front of the front wheel 4 and the rear portion is gradually increased so as to extend to a position higher than the rear wheel 7 by a predetermined distance. The rear portion of the outer peripheral frame 22 is connected by a sub-frame 22a that is horizontally provided in the left-right direction. The lower frame 21 is formed by bending a pair of left and right pipe-shaped steel materials in a substantially L shape when viewed from the side, and the rear upper end is connected and fixed to the left and right central portion of the subframe 22a in a shape that protrudes downward. . The lower frame 21 extends downward from the left and right middle portions of the subframe 22a located at the rear end of the outer peripheral frame 22, bends near the upper position of the wheel shaft 7a of the rear wheel 7 in a side view, and extends forward. It is connected and fixed to the rear lower surface of the mission case 2. The front portion of the transmission case 2 is connected to the outer peripheral frame 22 via the front wheel transmission shaft case 3 and the like, and the rigidity of the body frame 20 is obtained. A cross frame 19 is horizontally provided in the left and right direction at the bent portions of the left and right lower frames 21 and 21, and the lower frame 21 is raised rearward and upward from this portion.

  The outer peripheral frame 22 is connected to the left and right of the main frame configured in a substantially U shape in plan view by connecting the subframes 22a and 22b and the auxiliary frame 23 at the rear and middle portions in the front-rear direction to increase rigidity. In a side view, the front portion of the outer peripheral frame 22 is bent in an inverted “h” shape, and a floor frame for footrest is fixed in a space surrounded by the front portion of the outer peripheral frame 22 that is bent. A step 34 projects from the front part of the lower surface of the frame or the front side part of the outer peripheral frame 22 outwardly and downwardly. That is, as shown in FIG. 5, the step 34 is disposed so as to protrude obliquely outward and downward from the body frame 20 side between the outer peripheral frame 22 and the rotating case 3 d of the front wheel transmission shaft case 3 in a front view. The step 34 is formed in an inverted U shape when viewed from the side, and its upper end is fixed inside the outer peripheral frame 22. The step 23 is obliquely projected outward and downward in a front view so that it does not get in the way when working across a fence, and the lower end extends to the same height as the upper part of the front wheel 4 to Do not get caught in the top edge of. Further, when viewed from the side, step 34 is viewed from the side so that the lower rear portion of step 34 is positioned at the front upper side of the front wheel 4 and does not interfere when the handle 29 is rotated during turning and the front wheel 4 is rotated left and right. It is placed outside the projection range of the wheel.

  The auxiliary frame 23 is configured as a frontal portal type, and when the lower part of the outer peripheral frame 23 is attached to be tiltable rearward on the front and rear halfway part of the outer peripheral frame 22 at the rear side position of the seat 35 and stored in a warehouse or the like When the upper end of the auxiliary frame 23 is likely to hit a duck or the like, it can be rotated backward. Further, a locking body 39 that supports the tip of the nozzle boom 83 of the control work machine 8 at the time of storage is disposed on the outside of the auxiliary frame 23 in the vicinity of the rotation base.

  The operating portion 9 is disposed on the front portion of the outer peripheral frame 22, and as shown in FIG. 1, a handle post 26 is erected on the floor frame at the front portion of the outer peripheral frame 22, and the handle post 26 is placed inside the handle post 26. A handle support shaft 28 is supported, and a handle 29 is attached to the upper end of the handle support shaft 28. A PTO clutch lever 32, a brake lever, an accelerator lever, and the like are disposed on the side of the handle post 26. A front wheel steering mechanism 30 is interposed between the lower end of the handle support shaft 28 and the lower portion of the transmission case 2.

  A seat 35 is placed on the upper part of the transmission case 2 via a seat support machine frame. A main speed change operation lever and an auxiliary speed change operation lever are arranged on the right side in the traveling direction of the seat 35, while the work is on the left side. A lifting / lowering operation lever 38 of the machine, a tilling depth adjusting lever, and the like are provided.

Next, the support structure of the front wheel 4 will be described.
As shown in FIGS. 2, 5, 6, and 7, front wheel transmission shaft cases 3 and 3 are connected and fixed to both front side portions of the transmission case 2. Since the front wheel transmission shaft case 3 is configured substantially symmetrically, the right side in the traveling direction will be described.
The front wheel transmission shaft case 3 includes a lateral extension case 3a, a transmission case 3b, a vertical extension case 3c, and a rotation case 3d. The transmission case 3b and the rotation case 3d use the same case as the transmission case of a standard four-wheel riding management machine that does not increase the vehicle height in the past, thereby reducing costs.

The lateral extension case 3a is formed in a pipe shape, has flange portions on both sides, one end is fixed to the front side portion of the transmission case 2, and the other end is inside the transmission case 3b (on the left and right center side of the body). It is fixed. A front wheel drive transmission shaft 58 is accommodated in the lateral extension case 3a. Thus, the treads of the front wheels 4 and 4 are widened on both the left and right sides so that the vehicle can travel across the eaves, and the width is increased to improve the running stability.
A support stay 41 is protruded from the outer peripheral upper portion of the laterally extending case 3a so as to be connected and fixed to the lower surface of the floor frame. Further, a support stay 42 is projected below the lower outer periphery near the outside of the laterally extending case 3a, and the upper ends of the left and right reinforcing frames 43 are fixed by bolts or the like. The lower ends of the left and right reinforcing frames 43 are fixed by bolts or the like to support stays 45 projecting inwardly from the support pipes 44 that are rotatably fitted to the lower portions of the longitudinally extending case 3c. As shown in FIG.
In this way, the lateral extension case 3a arranged in the left-right direction, the vertical extension case 3c arranged in the up-down direction, and the left-right reinforcing frame 43 arranged obliquely are connected and fixed in a triangular shape, By doing so, they are firmly connected to each other to increase rigidity.

The transmission case 3b is configured as a substantially L-shaped hollow case when viewed from the front, the horizontal inner side is fixed to the end of the lateral extension case 3a, and the lower end is rotatably connected to the upper part of the vertical extension case 3c. ing. A bevel gear is housed in the transmission case 3b so that power for driving the front wheels can be transmitted from the front wheel drive transmission shaft 58 housed in the lateral extension case 3a to the transmission shaft 49 serving as a king pin.
Further, a mounting plate 46 is fixed to the front or rear surface of the transmission case 3b as left and right surfaces and extends upward, and the front end of the side frame 16 is fixed to the upper portion of the mounting plate 46. Thus, the rigidity of the wheel support system can be increased by using the left and right side frames 16, 16, the front wheel transmission shaft cases 3, 3 and the rear wheel transmission shaft cases 5, 5 as a frame structure.

The longitudinally extending case 3c is configured in a pipe shape and houses a transmission shaft 49. The transmission case 49b is supported to be rotatable about the transmission shaft 49 with respect to the transmission case 3b, and a knuckle arm 47 projects forward from the upper end. ing. A front wheel steering mechanism 30 (to be described later) is connected to the knuckle arm 47 so that the front wheel 4 can be turned left and right by operating the handle 29.
Further, as shown in FIG. 3, the longitudinally extending case 3c has a predetermined angle α in which the axis of the transmission shaft 49 serving as a king pin supported in the longitudinally extending case 3c in the side view is forward and downward from the transmission case 3b with respect to the vertical direction. The longitudinally extending case 3c is configured to incline and project so as to incline forward and lower than the conventional standard specification, so that the longitudinally extending case 3c becomes higher upward and straddles the heel. In addition, the center of gravity increases as the height increases, but as the front wheel 4 tilts forward as described above, the wheel base moves forward and the wheel base becomes longer, improving stability. If the transmission case 3b is attached with the standard specification, the longitudinal extension case 3c will be in the vertical direction. Therefore, the angle of attachment around the front wheel drive transmission shaft 58 is set at the flange portion of the lateral extension case 3a with respect to the transmission case 2. The vertical extension case 3c is tilted forward by changing and attaching.

Then, the support pipe 44 cannot be slid vertically and is rotatably fitted to the lower part of the vertically extending case 3c, and the support stay 45 is projected inward from the support pipe 44 to connect the left and right reinforcing frames 43. In addition, the lower front end of the front and rear reinforcing frame 48 is fixed to the rear surface of the support stay 45, the lower rear surface of the left and right reinforcing frame 43, or the rear surface of the plate fixed to the supporting pipe 44. The upper rear end of the front and rear reinforcing frame 48 is fixed to the lower surface of the transmission shaft case 6. The front end of the transmission shaft case 6 is fixed to the transmission gear case 50, and the transmission gear case 50 and the transmission case 3 b are integrally fixed to the connecting plate 51.
With this configuration, the longitudinally extending case 3c disposed substantially in the vertical direction, the front / rear reinforcing frame 48 disposed obliquely, and the transmission shaft case 6 disposed in the front / rear direction are connected in a triangular shape. By being fixed and having a truss structure, they are firmly connected to each other to increase the rigidity.
A rotating case 3d is fixed to the lower end of the vertically extending case 3c, and a front axle 4a is supported on the rotating case 3d.

Next, the support structure of the rear wheel 7 will be described.
2, 3, 4, and 7, a cross frame 19 is horizontally provided at the lower rear portion of the lower frames 21 and 21, and inside the rear wheel support frames 52 and 52 on both sides of the cross frame 19. The end is fixed. The rear wheel support frame 52 is composed of a horizontal frame 52a and an upper and lower frame 52b. The horizontal frame 52a is composed of a square pipe and the rear wheel 7 is arranged outward, that is, the tread is widened to straddle the heel. The mounting plates 53 and 54 are fixed to the inner end surface and the outer end surface of the horizontal frame 52a in the vertical direction in the front-rear direction, and are supported on the other surface side of the mounting plate 53. A frame 19 is fixed.

  The mounting plate 54 is fixed to the outer end surface of the horizontal frame 52a, and the lower portion of the support frame 55 is fixed to the upper portion of the other surface of the mounting plate 54. The support frame 55 projects obliquely outward and upward, and the rear portion of the side frame 16 is fixed to the upper end of the support frame 55. Thus, the side frame 16 extends in the front-rear direction and connects the support portions of the front wheel 4 and the rear wheel 7 to increase the strength.

  In this way, by connecting the upper portions of the front and rear front wheel transmission shaft cases 3 and the rear wheel transmission shaft case 5 in the front-rear direction with the side frames 16 at positions outside the body frame 20, A space can be formed above the side frame 16. That is, a space is formed between the side cover 31 and the rear wheel 7 that are disposed in the lower part inside the bonnet 25 or the outer peripheral frame 22. As shown in FIG. 4, a chemical tank 56 serving as a storage container in which the space shape is combined is disposed in a space above the side frame 16 inside the outer ends of the front wheels 4 and the rear wheels 7 on the side of the body frame 20. As a result, it is not necessary to mount the chemical tank 12 on the work machine mounting device 17 as shown in FIG. 1, the space can be used effectively, and the frame for supporting the chemical tank 56 also supports the machine body and increases rigidity. It can also be used as a frame. And, in the riding management machine that can work across the eaves as in this embodiment, the tread is widely configured, and a large bending force acts on the cross frame 19 and the rear wheel support frame 52 provided in the left and right horizontal direction. However, the chemical tank 56 serving as a storage container is disposed above the position close to the rear wheel 7 and is stored on the side frame 16 that connects the front and rear wheel transmission shaft cases 3 and 5 so that it is stored. The load of the container in the state is distributed to the front and rear wheels 4 and 7, and the bending force can be reduced. The chemical liquid tank 56 may be configured to be detachable, and a hopper for storing fertilizer, chemicals, or the like may be attached instead of attaching the chemical liquid tank 56. In this case, the work implement mounting device 17 is mounted with a fertilizer (medicine) feeding device. Moreover, the storage container according to work may be attached and what integrated the fertilizer supply apparatus and the hopper may be attached.

  In addition, a chemical tank, a hopper, a medicine feeding device, or the like is attached in a space formed on the rear wheel support frame 52 and between the rear wheel support frame 52 and the bonnet 25 or the side cover 31 and the rear wheel 5. It is also possible to attach a mounting table 57, a tool box, a storage container, or the like instead of these. That is, as shown in FIG. 9, a mounting table 57 is fixed on the rear wheel support frame 52 by welding or the like, and a tool box, a work machine, accessories, and a harvested product necessary for work are placed on the mounting table 57. Etc. can be placed. The mounting table 57 can be reinforced by being connected to the mounting plates 53 and 54 and the support frame 55, and a belt, a locking tool or the like is attached to the mounting table 57 to fix the mounted table. It can also be configured. With this configuration, the bent portion of the lower frame 21 and the rear wheel transmission shaft case 5 positioned on the side of the bent portion are connected by a frame, and the frame, the rear wheel 5 and the fuselage frame 20 are connected to each other. Parts, accessories, luggage, and the like necessary for various operations can be placed and stored in a placement space formed therebetween. That is, in the same manner as placing the container on the side frame 16, placing the fertilizer, luggage, etc. on the placing table 57 lowers the center of gravity downward and enables stable steering. In addition, since fertilizer, luggage and the like can be placed at a low position, loading and unloading can be performed easily, and when a fertilizer hopper is arranged, replenishment is facilitated. 7 and 9 show an embodiment in which the side frame 16 is not provided.

  The upper and lower frames 52b are formed in a "<" shape when viewed from the rear, with the upper end fixed to the outer lower surface of the horizontal frame 52a, the lower portion extending obliquely outward, and the end surface being a vertical surface. The inner surface of the rear wheel transmission shaft case 5 is fixed to the lower outer end surface of the upper and lower frames 52b. The mounting plate 54 is configured according to the shape of the outer surface of the upper and lower frames 52b, and is connected and fixed to increase the strength.

  The rear wheel transmission shaft case 5 has an input shaft mounted on the upper portion thereof, one end thereof projecting inward, and is linked to the transmission shaft 60 via a bevel gear or the like. The lower part of the upper and lower frame 52b is fixed to the inner surface of the middle part of the rear wheel transmission shaft case 5 and the rear axle 7a is horizontally mounted on the lower part, and one end protrudes outward to pivotally support the rear wheel 7. ing. The rear wheel transmission shaft case 5 uses the rear wheel transmission shaft case 5 that has been adopted in the conventional standard specification management machine with a low vehicle height to reduce the cost. The width of the left and right is increased. Conventionally, since the vehicle height is kept low, the rear wheel transmission shaft case 5 is disposed obliquely in a side view so as to tilt forward. Since the management machine of the present embodiment needs to increase the vehicle height, the rear wheel transmission shaft case 5 is attached so as to face substantially vertical. At this time, since the horizontal frame 52a has a quadrangular sectional view, the upper and lower surfaces are fixed so as to face the horizontal direction. However, in the present embodiment, since it is necessary to mount with inclination, the horizontal frame 52a remains inclined and is adjusted to the inclination with the attachment portion of the attachment pulley 53. That is, by changing the mounting position of the mounting pulley 53 around the axis, the conventional rear wheel transmission shaft case 5 can be mounted as it is.

  The transmission shaft 60 is housed in the transmission shaft case 6 and, as shown in FIG. 2, the transmission shaft in the transmission extension case 61 extending from the side portion of the transmission case 2 to the side, Power is transmitted through gears and the like, and is transmitted to the rear axle 7a through gears and transmission shafts in the rear wheel transmission shaft case 5 so that the rear wheels 7 can be driven.

  The transmission extension case 61 is provided parallel to the lateral extension case 3a of the front wheel transmission shaft case 3 and laterally at the rear thereof, and the transmission extension case 61 and the outer side of the lateral extension case 3a are connected by a connecting plate 51. So that the rigidity can be increased by reinforcing each other and the mounting portion for attaching the transmission case 3b and the transmission gear case 50 can be used as it is on the side surface of the transmission case 2 that has been conventionally employed. The flanges at both ends of the transmission extension case 61 and the lateral extension case 3a are shaped to match the mounting portion. That is, flanges are provided on both sides of the extension cases 3a and 61, and bolt holes serving as angle adjusting means are provided on the flanges so as to open at predetermined angles around the axis of the extension cases 3a and 61, respectively. ing. The bolt holes of the flange provided at one end of the extension cases 3a and 61 are fixed by bolts in accordance with the bolt holes opened on the side surface of the transmission case 2, and the bolt holes of the other flange are aligned with the bolt holes of the connecting plate 51. Secure with bolts. In this way, the rotation case 3d and the transmission shaft case 6 can be attached at a desired angle. That is, even if the mounting angle is different between the transmission case 3 and the transmission case 3a / 50 in the standard specification and the raised floor specification, the bolt hole is opened in accordance with the angle in the flange provided in the extension case 3a / 61. Thus, the angle can be easily changed. Therefore, even if other specifications exist, it is possible to easily change the specifications using the same parts only by facilitating an extension case having flanges with bolt holes opened at different angles.

The transmission shaft case 6 can be formed of a single pipe-like member, but the side frame 16 can be omitted by increasing the rigidity of the transmission shaft case 6. That is, as shown in FIGS. 2 and 7, the transmission shaft case 6 is divided into left and right halves and is combined with a bowl-like member, and the upper and lower ends are bent in the vertical direction to increase the rigidity and form an edge. The upper and lower edges are combined and fixed with bolts or the like. And the rigidity is increased by using a member having higher rigidity than the case 6b on the other side so that the case 6a on the left and right side is a frame that supports the front wheel 4 side and the rear wheel 7 side in a row. Yes. In this embodiment, the thickness of the case 6a inside the machine body is increased, and the case 6a is bent and formed in a hat shape in sectional view. The outer case 6b is a cover that covers the open side of the case 6a. The thin plate is bent into an Ω shape, and a light member is used for easy handling. The outer case 6b is fitted from the side and fixed with bolts or the like. Therefore, the assembly of the transmission shaft 60 and the like is facilitated, and the outer case 6b is attached and detached at the time of maintenance so that the work can be performed more easily from the outside than the open space on the side of the machine body.
By increasing the rigidity of the shaft case 6 in this way, as shown in FIG. 8, the side frame 16 can be omitted, and the number of parts and the number of assembly steps can be reduced.

Next, the front wheel steering mechanism 30 will be described with reference to FIGS. Since the front wheel steering mechanism 30 is configured substantially symmetrically, the right side in the traveling direction will be described.
A handle support shaft 28 fixed to the handle 29 extends downward through the handle post 26 and is linked to a pinion 64 disposed at the front left and right center of the lower surface of the handle post support. The pinion 64 is engaged with a semicircular arc-shaped rack 65 disposed in the rear portion thereof, and the arc-shaped rack 65 is pivoted on a pivot fulcrum shaft 66 whose center of the arc protrudes from the lower surface of the handle post support. It is supported.

  On both sides of the arc-shaped rack 65, pivot shafts 67 and 67 are provided to link the connecting rods 68 and 68, respectively. Note that side clutch connecting rods 69 and 69 are pivotally connected to the arc-shaped rack 65 on the center side of the machine body from the connecting rods 68 and 68. An intermediate link 70 is pivotally connected to the rear end of the connecting rod 68, and the intermediate link 70 is formed in a substantially triangular shape. One end of the connecting rod 68 is pivotally connected to one apex, and the other apex is the lateral apex. It is pivotally supported by the extension case 3a, and is pivotally supported by one end of the extension rod 71 at the remaining vertex.

A pivot fulcrum shaft 72 that pivotally supports the top of the intermediate link 70 is suspended below a mounting body 73 provided on the lower surface of the left and right middle portion of the lateral extension case 3a, and the connecting rod 68 and the intermediate link 70 are pivoted. The supporting fulcrum shaft 74 is disposed on the inner side of the machine body from the rotating fulcrum shaft 72, and the rotating fulcrum shaft 75 that pivots the intermediate link 70 and the extension link 71 is disposed forward of the rotating fulcrum shaft 72.
The other end of the extension link 71 is pivotally connected to the knuckle arm 47. In other words, the extension link 71 is arranged in the left-right direction in parallel with the lateral extension case 3 a, the body inner end is pivotally supported by the intermediate link 70, and the aircraft outer end is pivotally supported by the front portion of the knuckle arm 47.

With this configuration, when the handle 29 is rotated during turning, the pinion 64 provided at the lower end of the handle support shaft 28 is rotated, and the arcuate rack 65 meshed with the pinion 64 is rotated by the rotation support shaft 66. Is turned around. By this rotation, the connecting rod 68 pivotally supported by the arc-shaped rack 65 is moved in the front-rear direction, and the intermediate link 70 is rotated around the rotation fulcrum shaft 72. This rotation further moves the extension rod 71 left and right. The knuckle arm 47 is rotated by moving. By rotating the knuckle arm 47, the longitudinal extension case 3c is rotated and the front wheel 4 is rotated left and right to be directed in the traveling direction.
In this way, even when the tread of the traveling wheel of the management machine is expanded in the left-right direction, the intermediate link 70 that converts the front-rear movement into the left-right movement is pivotally supported by the lateral extension case 3a and connected to the intermediate link 70. By providing the extension link 71 to be parallel to the lateral extension case 3a, the rotation of the handle 29 can be accurately transmitted to the wheel.

  Next, the control work machine will be described. As shown in FIG. 1, the control work machine includes a control work machine 8 attached to the front part of the machine frame 20, and a chemical liquid tank 12 attached to the rear work machine mounting device 17, and the chemical liquid tank 12 is left and right as described above. It can also be arranged between the lower frame 21 and the outer frame 22 on both sides. The control work machine 8 and the chemical tank 12 are communicated by a chemical hose (not shown).

  The control work machine 8 includes a power sprayer 81, an engine 82 that drives the power sprayer 81, a boom 83 that spreads chemicals, a mounting base 84 that supports these, and the like. 85, a mounting base 84 is fixed to the front of the hitch 85, a mounting base 86 is provided in the horizontal direction at the upper end of the mounting base 84, and a power sprayer 81 and an engine 82 are mounted on the mounting base 86. It is mounted and fixed. The power from the engine 82 is transmitted to the input shaft of the power sprayer 81 through power transmission means such as a belt and a pulley. However, the means for driving the power sprayer 81 is not limited to the engine but may be a motor. Moreover, it is good also as a structure which transmits motive power from the engine 24 which drives the driving | running | working part 10. FIG. Further, the power sprayer 81 and the engine 82 can be fixed as they are by using a well-known set dynamic spray.

  A boom 83 is attached to the front portion of the mounting table 86 via a vertical position adjusting portion 87. The vertical position adjusting unit 87 has a round bar member or a square bar member 87a arranged in the vertical direction and fixed to the front part of the mounting table 86, and a round pipe or a square pipe 87b is attached to the round bar member or the square bar member 87a. Fit externally and fix with bolts etc. at desired height position. The boom 83 is attached to the round pipe or the square pipe 87b.

  The boom 83 includes a middle boom 83M at the center of the left and right sides and side booms 83L and 83R disposed on both sides of the middle boom 83M. A spray pipe is attached in parallel or integrally with the boom 83, and the base of the spray pipe Is connected to the discharge port of the power sprayer 81 through a valve and a connecting hose, and a plurality of nozzles (jet ports) 88, 88,... Are attached to the spray pipe at predetermined intervals along the longitudinal direction. It is possible to spray medicines.

  The boom 83 is provided with a rotation fulcrum on both sides of the middle boom 83M, and pivotally supports one end of the side booms 83L and 83R at both ends of the middle boom 83M. The storage position can be switched to the rear horizontal direction around the pivot point.

  A locking body 39 is provided on the auxiliary frame 23 so that the side booms 83L and 83R are stably supported in a state where the side booms 83L and 83R are rotated to the storage positions. That is, when the side booms 83L and 83R are pivoted back and forth on the side of the machine body and folded, the side booms 83L and 83R are bent by 90 degrees with respect to the middle frame 83M. The rear part of the side booms 83L and 83R needs to be sturdyly manufactured, and the rear end may be shaken by vibration or vertical movement during running or the like, and may contact or be damaged by other members.

  Therefore, in order to support the rear part of the side booms 83L and 83R on the outer side part of the machine body frame 20, as shown in FIGS. 1 and 11, a locking body 39 is arranged. In addition, although attached to the auxiliary | assistant frame 23 in a present Example, it can also comprise so that it may attach to the outer periphery frame 22. When the rear portions of the side booms 83L and 83R are supported by the locking bodies 39, the rear end positions of the side booms 83L and 83R are positioned forward of the rear ends of the outer peripheral frames 22, as shown in FIG. It is arranged at the front of the storage space. The outer peripheral frame 22 is disposed below the upper end. With this configuration, the boom 83 does not get in the way when performing maintenance by opening and closing the bonnet 25, or during operations such as attaching / detaching the chemical tank 12 or loading / unloading the placement unit disposed in the storage space. I am doing so.

The locking body 39 includes an attachment portion 39a, an upper hook portion 39b, and a lower hook portion 39c. An attachment hole is opened in the attachment portion 39a, and a U-shaped bolt 89 is fitted into the auxiliary frame 23 so as to fit into the attachment hole. It is configured to be inserted and fixed with a nut. However, it can also be set as the structure which inserts a volt | bolt in an attachment hole and is directly screwed and fixed to the auxiliary | assistant frame 23, and can also fix by welding.
An upper hook portion 39b and a lower hook portion 39c are attached to the side surface of the attachment portion 39a, and the upper hook portion 39b is configured to have a substantially L shape when viewed from the front, and a bent portion is formed at the distal end portion and the boom 83 is mounted. Sometimes it can be locked to prevent it from falling. The lower hook portion 39c is configured to have a substantially J-shape when viewed from the front, and has a configuration in which the boom 83 is placed on the lower portion and locked so as not to fall.

  With this configuration, when the side booms 83L and 83R are rotated backward during storage, the square pipe 87b is fixed at a high position with respect to the square bar member 87a, and the boom 83 is set at a high position. When the boom 83 is set at a low position by fixing the end of the side booms 83L and 83R on the upper hook portion 39b and locking the square pipe 87b at a low position with respect to the square bar member 87a. The top of the side booms 83L and 83R is placed on the lower hook portion 39c and locked. As shown in FIG. 1, even when the auxiliary frame 23 is tilted rearward during storage, the upper hook portion 39b and the lower hook portion 39c constitute an engaging portion that is bent upward outward. Therefore, the boom does not slide down.

  Further, when the boom 83 is configured to be folded and housed on both sides of the operation unit 9, the operator gets in the way of getting on and off, and strides in an unreasonable posture. Therefore, it is possible to fold it obliquely upward, but it is necessary to pass under the boom, and there is a possibility that the rear end becomes high and becomes a tree during storage. Therefore, it is configured to be foldable to the left and right sides. At this time, as shown in FIGS. 12, 13, and 14, when the boom 83 is divided into a plurality of parts and each boom 83 is folded to the left and right sides with the fulcrum shaft as the center, the folded boom is separated from the outer frame 22 and the front wheel 4 and the outer side of the rear wheel 5, the rear end of the boom is located in front of the rear end of the rear wheel 7 and the outer frame 22, and the height is the upper end of the outer frame 22 as described above. It is set as the act which stores it so that it may become a lower position. In the present embodiment, a configuration that is folded to the right in the traveling direction will be described.

  That is, in the case of the boom 92 configured in two parts, as shown in FIG. 12, the left and right booms 92L and 92R are configured in an L shape in a plan view, and each boom 92L and 92R has a spraying portion 92La and a nozzle 88 disposed therein. 92Ra and arm portions 92Lb and 92Rb attached to the vertical position adjusting portion 87. In the state of the spreading operation in which the booms 92L and 92R are projected in the horizontal direction, the arm 92Rb of the right boom 92R on the folding side (right side in this embodiment) is arranged in the front-rear direction and protrudes rearward and is provided at the rear end. The rotation fulcrum 92Rc is arranged closer to the right side (folding side) within the vehicle width of the traveling portion. The length of the arm 92 </ b> Rb is set so that the spraying portion 92 </ b> Ra is positioned on the side portion of the body frame 20 in the front-rear direction in the folded state. That is, the length is about ¼ to １ ／ of the left-right width D of the body frame 20.

  The left boom 92L opposite to the folding side is arranged in the horizontal direction so that the spreading part 92La is positioned on the extension of the spreading part 92Ra in the state of the spreading work, and the arm 92Lb protrudes forward, and its length Is configured to be substantially the same as or slightly longer than the arm 92Rb, and in the folded state, overlaps or is located outside or inside the spreading portion 92Ra. The rotation fulcrum 92Lc arranged on the front end side of the arm 92La and the rotation fulcrum 92Rc are attached to a support body arranged in the front-rear direction on a vertical position adjustment unit 87 (not shown).

  With this configuration, when the work is completed or stored, the left and right booms 92L and 92R projecting in the horizontal direction are rotated counterclockwise about the rotation fulcrums 92Lc and 92Rc, and the spraying unit 92La・ 92Ra can be stored in the side of the aircraft in the front-rear direction. Thus, the boom can be stored as before, and the operator gets on and off from the left side at the end of the work or at the time of storage, and the boom does not get in the way.

  Next, in the case of the boom 93 configured in three parts, as shown in FIG. 13, the left and right booms 93L and 93R are configured in an L shape in plan view, and the middle middle boom 93M is configured in a concave shape in plan view. Yes. Each of the booms 93L, 93M, and 93R includes a spraying portion 93La, 93Ma, and 93Ra in which the nozzle 88 is disposed, and an arm portion 93Lb, 93Mb, and 93Rb that is attached to the rotation fulcrum 93Lc, 93Mc, and 93Rc.

  The arm 93Rb of the right boom 93R on the folding side (right side in the present embodiment) is arranged in the front-rear direction and protrudes rearward in the state of the spreading work in which the booms 93L, 93M, 93R extend in the horizontal direction. The rotation fulcrum 93Rc is arranged on the right side in the vehicle width of the traveling portion. The length of the arm 93 </ b> Rb is set so that the spraying portion 93 </ b> Ra is positioned on the side portion of the body frame 20 in the front-rear direction in the folded state. That is, the length is about 1/3 of the left-right width D of the body frame 20.

  The middle boom 93M at the center of the left and right has a spraying portion 93Ra arranged in the horizontal direction in the state during the spraying operation, projects arms 93Mb and 93Mb forward from both sides of the spraying portion 93Ra, and a pivot fulcrum 93Mc · 93Mc is disposed, and the length thereof is slightly shorter than that of the arm 93Rb to suppress forward protrusion. The length of the spreading part 93Ma is about 1/3 of the left-right width D of the body frame 20.

  The left boom 93L on the opposite side to the folding side is arranged in the horizontal direction so that the spreading part 93La is positioned on the extension of the spreading parts 93Ma and 93Ra in the state of the spreading work, and the arm 93Lb projects forward, The length is configured to be substantially the same as that of the arm 93Mb, and in the folded state, the length is overlapped with, or outside or inside, the spraying portion 93Ra. The rotation fulcrum 93Rc of the arm 93Ra and the rotation fulcrum 93Mc of the arm 93Mb are attached to a support body arranged in the front-rear direction on an unillustrated vertical position adjustment unit 87, and the other of the rotation fulcrum 93Lc of the arm 93Lb and the other of the middle boom 93M. The rotation fulcrum 93Mc is configured to be detachable from the support.

  With this configuration, when the work is completed or stored, the right boom 93R and the middle boom 93M projecting in the horizontal direction are rotated counterclockwise around the pivot fulcrum 93Rc / 93Mc, and the left boom The 93L rotation fulcrum 93Lc is unlocked and rotates counterclockwise together with the middle boom 93M. Then, the spreading unit 93Ra is positioned in the front-rear direction on the machine body side, and the spraying unit 93Ma and the spreading unit 93La are rotated about the rotation fulcrum 93Lb so that the spreading unit 93L is positioned in the front-rear direction on the machine body side. Fold and store. Thus, the boom can be stored as before, and the operator gets on and off from the left side at the end of the work or at the time of storage, and the boom does not get in the way.

  Next, in the case of the boom 94 configured in four parts, as shown in FIG. 14, the left and right booms 94L and 94R are configured in an L shape in plan view, and the middle boom 94M on the opposite side to the center folding side is a flat surface. The middle boom 94F that is configured to have a concave shape and is folded is configured to be linear. The booms 94L, 94M, and 94R are composed of spraying portions 94La, 94Ma, and 94Ra on which the nozzles 88 are disposed, and arm portions 94Lb, 94Mb, and 94Rb that are attached to the rotation fulcrums 94Lc, 94Mc, and 94Rc. It cannot be moved and is fixed.

  The arm 94Rb of the right boom 94R on the folding side (right side in the present embodiment) is arranged in the front-rear direction and protrudes rearward in the state of the spreading work in which the booms 94L, 94M, 94R are projected in the horizontal direction. The rotation fulcrum 94Rc is arranged near the right side in the vehicle width of the traveling portion. The length of the arm 94 </ b> Rb is set so that the spraying portion 94 </ b> Ra is positioned on the side portion of the body frame 20 in the front-rear direction in the folded state. That is, since the rotation fulcrum 94Rc is close to the right end of the machine body, the length of the arm 94Rb may be short.

  The middle boom 94M at the center of the left and right has a spraying portion 94Ra arranged in the horizontal direction in the state of spraying work, projects arms 94Mb and 94Mb forward from both sides of the spraying portion 94Ra, and a pivot fulcrum 94Mc · 94Mc is arranged, and the length thereof is configured to be shorter than the arm 93Mb of the three-part boom 93 to suppress forward projection. The length of the spreading portion 94Ma is substantially the same as that of the middle boom 94F, and is about ¼ or more and ½ or less of the lateral width D of the body frame 20.

  The left boom 94L on the opposite side to the folding side is arranged in the horizontal direction so that the spreading part 94La is positioned on the extension of the spreading parts 94Ma and 94Ra and the middle boom 94F in the state during the spreading work, and the arm 94Lb is located on the front side. The length of the arm 94 </ b> Mb is substantially the same as that of the arm 94 </ b> Mb, and in a folded state, overlaps with the spreading portion 94 </ b> Ra or is positioned outside or inside. The pivot fulcrum 94Rc of the arm 94Ra and the pivot fulcrum 94Mc of the arm 94Mb are attached to a support body arranged in the front-rear direction on a vertical position adjusting unit 87 (not shown), and the other pivotal support 94Lc of the arm 94Lb and the other of the middle boom 94M. The rotation fulcrum 94Mc is configured to be detachable from the support.

    With this configuration, the right boom 94R and the middle boom 94M projecting in the horizontal direction are rotated counterclockwise around the rotation fulcrum 94Rc / 94Mc when the work is finished or stored, and the left boom The 94L rotation fulcrum 94Lc is unlocked and rotates counterclockwise together with the middle boom 94M. Then, the spraying part 94Ra is positioned in the longitudinal direction on the machine body side, and the spraying part 94Ma and the spraying part 94La are rotated around the pivot fulcrum 94Lb so that the spraying part 94L is positioned in the longitudinal direction on the machine body side. Fold and store. Thus, the boom can be stored as before, and the operator gets on and off from the left side at the end of the work or at the time of storage, and the boom does not get in the way.

Overall side view of a passenger work vehicle of the present invention The top view of a body frame and a transmission shaft case. Similarly side view. Similarly rear view. The front view of a front-wheel drive shaft case. The lower perspective view of a front-wheel transmission shaft case and a front-wheel steering mechanism. The perspective view of a transmission shaft case part. The whole side view of the passenger work vehicle which lost the side frame. The rear view which provided the mounting base on the rear-wheel support frame. The top view which shows a front wheel steering mechanism. The perspective view which provided the latching body in the auxiliary | assistant frame. The top view of the Example which divided the boom of the spraying apparatus into two. The top view of the Example which divided the boom of the spraying apparatus into three parts. The top view of the Example which divided the boom of the spraying apparatus into four parts.

Explanation of symbols

2 Transmission case 3 Front wheel transmission shaft case 3a Lateral extension case 3b Transmission case 3c Vertical extension case 3d Rotation case 4 Front wheel 5 Rear wheel transmission shaft case 6 Transmission shaft case 7 Rear wheel 10 Traveling portion 29 Handle 30 Front wheel steering mechanism 47 Knuckle arm 48 Front / rear reinforcement frame 49 Kingpin 50 Transmission gear case 61 Transmission extension case 70 Intermediate link

Claims (6)

  A transmission case 2 is arranged at the front left and right center of the traveling unit 10, and from both left and right sides of the transmission case 2 through front wheel transmission shaft cases 3, 3, transmission gear cases 50, 50, and transmission shaft cases 6, 6. A rear wheel transmission shaft case 5, 5 is a four-wheel riding work vehicle that transmits and supports power to the front wheels 4, 4 and the rear wheels 7, 7 and includes the front wheel transmission shaft case 3. The front wheel transmission shaft case 3 is attached via a laterally extending case 3a provided in the left-right horizontal direction with respect to the transmission case 2 so that the axis of the king pin 49 supported on the front side is inclined forward and downward in a side view. A passenger work vehicle.   2. The passenger work vehicle according to claim 1, wherein a transmission shaft case 6 is attached to the transmission case 2 via a transmission extension case 61, and the transmission shaft case 6 is attached to be inclined downward and rearward from the horizontal. .   The front wheel transmission shaft case 3 is laterally extended case 3a, a transmission case 3b fixed to the outer end of the horizontal extension case 3a, a vertical extension case 3c fixed to the lower part of the transmission case 3b, and the vertical extension The rotating case 3d is fixed to the lower portion of the case 3c and supports the front wheel 4. A left and right reinforcing frame 43 is interposed between the laterally extending case 3a and the vertically extending case 3c, and the vertically extending case 3c and the transmission shaft case are provided. The passenger work vehicle according to claim 1, wherein a front-rear reinforcing frame is interposed between the front and rear reinforcement frames.   The intermediate link 70 that converts the front-rear movement in the front wheel steering mechanism 30 that transmits the rotational movement of the handle 29 to the front wheel 4 via the handle shaft, gear, rod, link, knuckle arm 47, etc., is converted into the left-right movement. The passenger work vehicle according to claim 3, wherein the work vehicle is pivotally supported by the case 3 a.   A transmission case 2 is arranged at the front left and right center of the traveling unit 10, and from both left and right sides of the transmission case 2 through front wheel transmission shaft cases 3, 3, transmission gear cases 50, 50, and transmission shaft cases 6, 6. A rear wheel transmission shaft case 5, 5 is connected to the front wheels 4, 4 and the rear wheels 7, 7, and is a four-wheel riding work vehicle that supports and divides the transmission shaft case in half. A passenger work vehicle characterized in that one is a frame and the other is a cover. A transmission case 2 is arranged at the front left and right center of the traveling unit 10, and from both left and right sides of the transmission case 2 through front wheel transmission shaft cases 3, 3, transmission gear cases 50, 50, and transmission shaft cases 6, 6. A four-wheel riding work vehicle in which rear wheel transmission shaft cases 5 and 5 are connected in series to transmit power to and support the front wheels 4 and 4 and the rear wheels 7 and 7. The transmission case and the transmission case The extension cases 3a and 61 are arranged between the 3b and 50 to increase the width of the left and right front wheels 4 and 4 and the rear wheels 7 and 7, and angle adjusting means are provided on the flanges arranged on both sides of the extension cases 3a and 61. A passenger work vehicle characterized by being provided.

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