JP2013117145A - Wheel type work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve development efficiency and production efficiency of a wheel type work vehicle by standardizing a chassis, and a front attachment and a rear attachment attached to the chassis in the wheel type work vehicle.SOLUTION: A wheel type work vehicle comprises an upper pivoting body and a lower traveling body which is connected with the upper pivoting body in a round body and includes front wheels and rear wheels. The lower traveling body has a chassis which extends in a longitudinal direction and includes the round body. The chassis is structured while being into three of a center chassis including the round body, a front chassis connected to a front part of the center chassis, and a rear chassis connected to a rear part of the front chassis. A front wheel shaft for rotationally driving the front wheels can be mounted to the front chassis and a front-side attachment can be attached in its front end. A rear wheel shaft for rotationally driving the rear wheels can be mounted to the rear chassis and a rear-side attachment can be attached in its rear end.

Description

  The present invention relates to a wheel-type work vehicle, and more particularly to a wheel-type hydraulic excavator.

  A wheel-type hydraulic excavator, which is a kind of wheel-type work vehicle, has a lower traveling body and an upper turning body. The upper turning body is mounted on the lower traveling body so as to be able to turn, and the working device is attached to the front portion. The lower traveling body includes a chassis extending in the front-rear direction, left and right rear wheels attached to the chassis, and left and right front wheels. Attachment for work or posture maintenance, such as an outrigger device, a soil removal device (blade), and a column pipe, is attached to the chassis.

  When the wheeled excavator has an outrigger, after traveling on the general road toward the work site and arriving at the work site, the outrigger device attached to the chassis of the lower traveling body is grounded to the ground of the work site and Jack up. And in the state which stabilized the vehicle body by the outrigger apparatus, excavation work etc. of earth and sand are performed using a working device.

  An example of such a conventional wheeled work vehicle is described in Patent Document 1. In the work vehicle described in this publication, in order to facilitate positioning of the attachment side end plate with respect to the chassis side end plate, a pin fitting plate having a pin fitting hole is fixed to the lower end side of the chassis side end plate, and the outrigger device is attached. An overhanging plate portion projecting toward the chassis side is provided on the lower end side of the provided attachment side end plate. Furthermore, a guide pin protrudes from the upper surface side of the overhanging plate portion.

  Another example of a conventional wheeled work vehicle is described in Patent Document 2. In the wheel-type construction machine described in this publication, the traveling device mounted on the lower chassis of the wheel-type construction machine configured by the upper-part turning body provided with the working machine and the lower chassis provided with the traveling device is used for rough terrain work. In order to prevent damage due to occasional riding or the like, the frame of the lower chassis is composed of a thin plate-integrated structure and a boat-shaped side plate and a top plate. An axle, a hydraulic motor, a transmission, a propeller shaft, and the like are disposed inside the side plate. The wheel is attached to a bracket fixed to the frame via a support member.

  Still another example of a conventional wheeled work vehicle is described in Patent Document 3. In the wheel type construction machine described in this publication, in order to prevent the components from being pushed up from below, the frame is integrally formed of a front boat type structure part and a rear ladder type structure part. And a radiator, an engine, and a transmission are accommodated in the boat-shaped structure part which consists of a side plate and a bottom plate, and the push-up from the bottom is prevented.

JP2011-12512A JP-A-6-173297 JP 9-316927 A

  By the way, in the wheel type work vehicle, various models are prepared according to the weight of the vehicle body and the work content, and the difference between these models is realized as the difference in the chassis. In other words, various chassis are required depending on the strength required for the chassis and the types of accessories attached to the chassis.

  On the other hand, since the wheel-type work vehicle is capable of traveling on a public road, the rules applied to the public road must be observed, and the work vehicle is provided with various regulations through vehicle inspection and the like. As a result, the size of the front-side attachment and rear-side attachment that can be applied to the wheel-type work vehicle is also limited, and it is preferable to standardize and standardize these attachments. If the chassis is also standardized according to the standardized attachment, it is possible to reduce the number of models, improve the development efficiency, and improve the production efficiency.

  In the wheel type work machines described in each of the above patent documents, although the assembly accuracy of attachments and prevention of push-up on rough terrain are taken into consideration, the models are standardized and developed using the ability to travel on public roads. There is not enough consideration to improve efficiency and production efficiency.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to enable standardization of a chassis and a front attachment and a rear attachment attached to the chassis in a wheel work vehicle. Is to improve development efficiency and production efficiency. Another object of the present invention is to improve production efficiency and development efficiency by using a chassis as a divided structure in a wheeled work vehicle.

  A feature of the present invention that achieves the above object is that an upper swing body having a cab on which an operator gets on and a work machine used for the work, and a swing wheel provided on the upper swing body and the round body can be turned. In a wheeled work vehicle having a lower traveling body connected and having a front wheel and a rear wheel, the lower traveling body includes a chassis that extends in the front-rear direction and includes the round body, and the chassis includes the round body portion. A central chassis provided, a front chassis connected to a front portion of the central chassis and having an axle mounting portion for the front wheel, and a rear chassis connected to a rear portion of the central chassis and having an axle mounting portion for the rear wheel The front chassis is formed so that a front attachment can be attached to the front end, and the rear chassis is formed so that a rear attachment can be attached to the rear end. It lies in the fact.

  In this feature, the connecting portion between the central chassis and the front chassis is preferably near the portion where the width direction length W of the chassis is smallest in the front-rear direction. A hydraulic hose connecting portion for guiding pressure oil to the front attachment connected to the front chassis is formed in the vicinity of the connecting portion, and the rear attachment pressure oil connected to the rear chassis in the vicinity of the connecting portion between the central chassis and the rear chassis. It is preferable to form a connection part of the hydraulic hose for guiding each of them.

  In the above feature, the front attachment connected to the front chassis and the rear attachment connected to the rear chassis may be any one of a soil removal device, an outrigger device, a crumb pipe, and a bolt-on attachment, The connection between the front chassis and the central chassis and the rear chassis is preferably any one of welding, bolt fastening, pin fastening, and combined use of bolt fastening and pin fastening.

  According to the present invention, the chassis has a three-part structure of a front chassis having an axle mounting portion for a front wheel, a central chassis having a round body portion on which a turning wheel is mounted, and a rear chassis having an axle mounting portion for a rear wheel. The front wheel shaft mounting part can be integrated with the front attachment, and the rear wheel shaft mounting part can be integrated with the rear attachment. And production efficiency is improved.

1 is a side view of an embodiment of a wheeled work vehicle according to the present invention. It is a perspective view of one Example of the chassis of the wheel type work vehicle concerning the present invention. It is a perspective view which shows the combination of the chassis shown in FIG. It is a perspective view which shows the combination of the other Example of a chassis. It is a perspective view which shows the combination of the further another Example of a chassis. It is a perspective view explaining hydraulic piping.

  Hereinafter, an embodiment of a wheeled work vehicle according to the present invention will be described using a wheeled hydraulic excavator. In the following description, a wheel-type hydraulic excavator will be described. However, the wheel-type work vehicle of the present invention is not limited to a hydraulic excavator, and can be applied to a work vehicle that can travel on a public road such as a crane.

  FIG. 1 is a side view of a wheeled hydraulic excavator 50. The wheel-type hydraulic excavator 50 includes a wheel-type lower traveling body 2 having a chassis 11 and an upper revolving body 4 that is mounted on the lower traveling body 2 via a revolving wheel 3 so as to be able to swivel. A proximal end side of the working device 9 is attached to the front portion of the upper swing body 4. An outrigger device 21 that holds the wheel-type hydraulic excavator 50 against the ground when the work device 9 of the wheel-type hydraulic excavator 50 is operated is attached to the front of the chassis 11.

  The wheel-type hydraulic excavator 50 can travel on a general road by driving the wheel-type lower traveling body 2. Further, at the work site, the outrigger device 21 is overhanged, the wheel-type hydraulic excavator 50 is fixed, and the work device 9 is used for excavating earth and sand.

  The upper swing body 4 includes a swing frame 5 that is turnably mounted on the chassis 11 via the swing wheel 3, a cab 6 that is provided on the left side of the front portion of the swing frame 5 and serves as a cab, and a rear of the swing frame 5. The counter weight 7 is provided on the end side and balances the weight with the work device 9, and the building cover 8 is provided on the revolving frame 5 and is located on the front side of the counter weight 7. In the cab 6, a driver's seat where an operator is seated, a handle for steering the left and right front wheels 15, an operating lever for operating the work device 9, and the like are arranged, although not shown. Although not shown, the building cover 8 houses an engine, a hydraulic pump, and the like as a prime mover.

  The work device 9 is provided on the front side of the upper swing body 4 so as to move up and down. The working device 9 includes a lower boom 9A whose base end side is pivotally attached to the front side of the revolving frame 5, an upper boom 9B pivotally attached to the distal end side of the lower boom 9A, and an upper boom 9B. An arm 9C that is rotatably attached to the distal end side and a bucket 9D that is rotatably attached to the distal end side of the arm 9C are connected to each other. The arms 9A and 9B and the booms 9C and 9D are driven by a boom cylinder 9E, a positioning cylinder 9F, an arm cylinder 9G, and a bucket cylinder 9H, respectively. That is, when these cylinders 9E to 9H extend and contract, the arms 9A and 9B and the booms 9C and 9D rotate.

  The chassis 11 is a base of the lower traveling body 2. FIG. 2 shows a detailed perspective view of the chassis 11A (see FIG. 2B) and the chassis 11B (see FIG. 2A). Here, the chassis 11A is a large chassis, and the chassis 11B is a small chassis. Each of the chassis 11A and 11B includes a front chassis 120, a central chassis 110 (210), and a rear chassis 130.

  The chassis 110 to 130 and 210 will be described in detail later, but the top plate extending in the front-rear direction, the bottom plate facing the top plate in the vertical direction, the left and right sides arranged between the top plate and the bottom plate and facing in the left-right direction It is formed as a box structure having a square cross section surrounded by side plates. And the rectangular end plate is attached to the front-back direction edge part of each chassis 110-130,210 as needed.

Here, as a characteristic matter of the present invention, in each chassis 11A, 11B, the front chassis 120 and the rear chassis 130 are common to both chassis 11A, 11B. Therefore, the width _{W 1} of the front end plate 325 of the central chassis 210 constituting the width _{W 1} and the chassis 11B of the front end plate 315 of the central chassis 110 constituting the chassis 11A are the same, the center chassis 110 constituting the chassis 11A the width _{W 2} of the side end plate 324 after the center chassis 210 constituting the width _{W 2} and the chassis 11B of the side edge portion 314 after are the same. The vertical heights of the chassis 110 to 130 and 210 are substantially the same.

As described above, the round cylinder 12 for rotatably connecting the upper swing body 4 is provided on the upper surface of each central chassis 110 and 210. The large chassis 11A and the small chassis 11B have different lengths in the front-rear direction. Therefore, each chassis 11A, the center chassis 110 and 210 of the 11B, the length of the longitudinal direction, as long as _{L 1} in the center chassis 110 is shorter and _{L 2} in the central chassis 210. Accordingly, the diameters φD ₁ and φD ₂ of the center portion of the round cylinder 12 are also different.

  Although there are these differences, the large chassis 11A and the small chassis 11B are substantially the same in other respects. This is because the wheel-type hydraulic excavator 50 equipped with these chassis 11A and 11B must satisfy various regulations in order to be able to travel on public roads. For example, it is necessary to satisfy regulations such as vehicle width and height. In order to attach the front wheel 15 and the rear wheel 16 to the wheel-type hydraulic excavator 50, brackets 181 which are axle mounting portions for holding the front wheel shaft and the rear wheel shaft are respectively provided on the lower surface of the front chassis 120 and the lower surface of the rear chassis 130. , 182 are attached by bolt fastening or welding.

  FIG. 3 is a perspective view showing a first embodiment of the chassis according to the present invention. FIG. 3A is a perspective view of a rear chassis 130 used in common for a large chassis 11A for a large work vehicle and a small chassis 11B for a small work vehicle. FIG. It is a perspective view of the front chassis 120 used in common with the small chassis 11B. FIG. 3B is a perspective view of the intermediate chassis 210 used for the small chassis 11B, and FIG. 3C is a perspective view of the intermediate chassis 110 used for the large chassis 11A. Therefore, when configuring the large chassis 11A, the chassis 130, 110, 120 shown in FIGS. 3A, 3C, and 3D are connected in the front-rear direction to configure the small chassis 11B. In such a case, the chassis 130, 210, 120 shown in FIGS. 3A, 3B, and 3D are connected in the front-rear direction.

  In the first embodiment, the connections between the chassis 130 and 110 (210), and 110 (210) and 120 are connected by welding. That is, the front chassis 120 includes a front end plate 327 that is a vertically arranged flat plate and a U-shaped chassis portion 347 that is attached to the end plate 327, and the front surface of the chassis portion 347 and the end plate 327 are formed. Joined by welding. Similarly, the rear chassis 130 is composed of a rear end plate 332 and a U-shaped chassis portion 352 arranged vertically, and the rear surface of the chassis portion 352 and the end plate 332 are welded. The end plate 327 of the front chassis 120 and the end plate 332 of the rear chassis 130 are used as flanges for connection to the attachment. Therefore, the front surface 120c of the end plate 327 and the rear surface 130c of the end plate 332 are flat.

  The central chassis 110 for a large machine includes a box-shaped chassis portion 345 having a narrow front portion and end plates 315 and 314 disposed at both front and rear ends of the chassis portion 345. The chassis 345 includes a top plate 310, a bottom plate 313 parallel to the top plate 310, and left and right side plates 311 and 312 that connect the top plate 310 and the bottom plate 313. The part is provided with a round cylinder 12 provided with a turning wheel 3 for attaching the upper turning body 4 in a turnable manner.

  The top plate 310 has a substantially constant width direction from the position of the rear end plate 314 to the position of a straight line passing through the center of the round cylinder 12 and parallel to the front and rear end plates 315 and 314. The width up to the plate 315 gradually decreases, and the front end plate 315 can be attached to the front chassis 120. Since the front and rear end plates 315 and 314 act as flanges for attaching the front and rear chassis 120 and 130, the front surface 110a of the front end plate 315 and the rear surface 110b of the rear end plate 314 are flat.

  Here, as a feature of the present embodiment, the front chassis 120 and the central chassis 110 and the rear chassis 130 and the central chassis 110 are connected by welding. That is, the end surface 120a of the front chassis 120 is welded to the end surface 110a of the end plate 315 of the central chassis. Similarly, the end surface 130 a of the rear chassis 130 is welded to the end surface 110 b of the end plate 314 of the central chassis 110.

  As in the case of the central chassis 110 for large work vehicles, the end surface 120a of the front chassis 120 is welded to the end surface 210a of the front end plate 325, and the end surface 210b of the rear end plate 324 is also welded to the central chassis 210 for small work vehicles. The end surface 130a of the rear chassis 130 is welded. A central chassis 210 for a small work vehicle connects a top plate 320 with a round cylinder 12 attached to an intermediate portion in the front-rear direction, a bottom plate 323 arranged parallel to the top plate 320, and the top plate 320 and the bottom plate 323. The left and right side plates 321 and 322 and the end plates 325 and 324 disposed at the front and rear ends are the same as the central chassis 110 for a large work vehicle, but the lengths in the front and rear directions are different. The front and rear end plates 325 and 324 have the same shape as the front and rear end plates 315 and 314 for a large work vehicle. Thereby, the front and rear chassis 120 and 130 can be made common in both large and small work vehicles.

  Next, another embodiment of the chassis of the wheel type work vehicle according to the present invention will be described with reference to FIG. This embodiment differs from the embodiment shown in FIG. 3 in that the front chassis 121 (122) and the rear chassis 131 are attached to the central chassis 110 (210) with bolts instead of welding. FIG. 4 also shows the front (front side) attachment. As the attachments, earth removing devices 140 and 141 and outrigger devices 150 and 151 are shown.

  The structure (FIGS. 4B and 4C) of the central chassis 110 (210) is the same as that shown in FIG. 3, but the front and rear end plates 315 and 314 (325 and 324) have flange portions. A plurality of bolt holes 111a and 111b (211a and 211b) are formed in the upper surface. On the other hand, the end plates 326 and 331 of the front and rear chassis 121 (122) and 131 are formed with a plurality of through holes (bolt holes) 121b, 122b, and 130b at the periphery (FIGS. 4A and 4D). ) To (g)).

  The front chassis 121 (122) and the central chassis 110 (210) and the central chassis 110 (210) and the rear chassis 131 are formed in the bolt holes formed in the end plates 314, 315 (324, 325), 326, 331, respectively. The fastening bolts 122d and 130d are connected by screwing. Thus, also in the present embodiment, the front chassis 121 (122) and the rear chassis 131 can be shared by the large work vehicle and the small work vehicle.

  Note that the difference between the front chassis 121 and the front chassis 122 is due to the difference in the attachment method. In the case of the front chassis 121 (FIGS. 4D and 4G), the soil removal device 140 or the outrigger 151 device, which is an attachment, is bolted to the front chassis 121. Therefore, the peripheral edge portion of the front end plate 327 of the front chassis 121 has a flange shape and a plurality of bolt holes (not shown) are formed, and are bolted by fastening bolts 142 and 155. 4 (h) shows an X portion of FIG. 4 (d), and FIG. 4 (j) shows an enlarged view of the Y portion of FIG. 4 (g).

  The soil removal device 140 has a soil removal plate 144 at the front, and its posture is changed by a hydraulic cylinder (not shown). The earth removing device 140 is used for work such as scraping the ground surface. The outrigger 1 device 151 has an outrigger float 152 that can rotate around a rotation shaft 153 on both right and left sides thereof, and is driven by an outrigger cylinder (not shown). The outrigger device 151 holds the wheel-type hydraulic excavator 50 stably. In the outrigger device 151, an end plate 328 having a bolt hole formed in the peripheral portion is provided at the rear end portion for fastening with the front chassis 121.

  On the other hand, in the case of the front chassis 122 (FIGS. 4E and 4F), the soil removal device 141 or the outrigger device 150 as an attachment on the front side is welded to the front chassis 122. Others are the same as the case of bolt fastening. Here, the end plate 328 of the outrigger device 150 and the end plate 329 of the earth removing device are also made common, and when fastening bolts, if the bolt holes are processed in the end plates 328 and 329, the types of attachments can be further reduced. Is possible.

  Still another embodiment of the chassis of the wheeled work vehicle 50 according to the present invention will be described with reference to FIG. This embodiment is different from the above embodiments in that the mounting method of the central chassis 110 (210) and the front and rear chassis 120, 130 is a pin connection instead of welding or bolt fastening.

  A bracket 118 having pin attachment holes 119 formed at two positions in the width direction or a bracket 218 having pin holes 219 is attached to the front face 110a (210a) of the front end plate 315 of the central chassis 110 (210). The pin hole 119 (219) is a hole penetrating in the width direction of the central chassis 110 (210). Similarly, brackets 116 (216) having pin holes 117 (215) formed on the rear surface 110b (210b) of the rear end plate 314 of the central chassis 110 (210) are attached to two places in the width direction. The penetrating direction of the pin hole 117 (215) is also the width direction.

  On the other hand, on both side plates 343 and 344 of the front chassis 120, pin holes 126 which are through holes are formed. Then, the rear end surface 120a of the front chassis 120 is brought into contact with the front surface 110a (210a) of the front end plate 315 (325) of the central chassis 110 (210), and pin holes 126 formed in the side plates 343 and 344 of the front chassis 120 are formed. The fastening pin 125 is driven in the width direction. Thereby, the front chassis 120 and the center chassis 110 (210) are firmly fastened.

  Similarly, pin holes 136 that are through holes are formed in both side plates 341 and 342 of the rear chassis 130. Then, the front end surface 130a of the rear chassis 130 is brought into contact with the rear surface 110b (210b) of the rear end plate 314 (324) of the central chassis 110 (210) to form pin holes 136 formed in the side plates 341 and 342 of the rear chassis 130. The fastening pin 135 is driven in the width direction. Thereby, the rear chassis 130 and the central chassis 110 (210) are firmly fastened. Also in the present embodiment, the front chassis 120 and the rear chassis 130 can be shared by both the large work vehicle and the small work vehicle. As a result, the front attachment and the rear attachment can be shared by both the large work vehicle and the small work vehicle.

  In each of the above-described embodiments, the description of the rear attachment is omitted, but the rear attachment is attached to the rear end plate 332 of the rear chassis 130 by welding or bolt fastening, like the front attachment. As the attachment, an outrigger device, a soil removal device, a crumb pipe for holding the work machine during traveling, and a bolt-on attachment are used. In the above embodiment, pins and bolts are used separately, but it goes without saying that the center chassis 110 (210) and the front and rear chassis 120, 130 may be connected using both pins and bolts. .

  FIG. 6 is a perspective view showing an example of hydraulic piping when the outrigger device 160 is attached to the rear chassis 130 as an attachment. An outrigger cylinder 161 for driving the outrigger device 160 is disposed in the vicinity of the outrigger float, and one end of a hydraulic hose 162 that guides pressure oil to the outrigger cylinder 161 is connected to the outrigger cylinder 161. A hydraulic connector 163 is attached to the other end of the hydraulic hose 162, and pressure oil is guided by a hydraulic hose 165 from a hydraulic pump (not shown). A hydraulic connector 164 that engages with the hydraulic connector 163 is attached to the end of the hydraulic hose 165. These hydraulic connectors 163 and 164 are detachable near the connection portion between the rear chassis 130 and the central chassis 110. Also in the case of the front side attachment, the connector of the hydraulic hose is detachable near the connecting portion between the front chassis 120 and the central chassis 110. The same applies to the case where the central chassis 210 of the small machine is used.

  According to each of the above embodiments, the wheel-type work vehicle is divided into three parts, and the chassis before the front attachment is attached and the chassis after the rear attachment attachment is standardized. By simply changing it, the front chassis, rear chassis, and front / rear attachments can be shared, and the design efficiency and production efficiency of wheeled work vehicles can be improved.

DESCRIPTION OF SYMBOLS 2 ... Lower traveling body, 3 ... Turning wheel, 4 ... Upper turning body, 5 ... Turning frame, 6 ... Cab, 7 ... Counterweight, 8 ... Building cover, 9 ... Working apparatus, 9A ... Lower boom, 9B ... Upper boom, 9C ... arm, 9D ... bucket, 9E ... boom cylinder, 9F ... positioning cylinder, 9G ... arm cylinder, 9H ... bucket cylinder, 11 ... chassis, 11A ... large chassis set, 11B ... small chassis set, 12 ... round cylinder, 15 ... Front wheel, 16 ... rear wheel, 21 ... outrigger device (attachment), 34 ... soil removal device (attachment) 50 ... wheel excavator (work vehicle), 110 ... central chassis (large), 110a ... front surface, 110b ... rear surface, 111a, 111b ... bolt hole, 116 ... bracket (axle mounting portion), 117 ... pin hole, 118 ... bracket, 119 Pin hole, 120 ... front chassis, 120a ... rear face, 120c ... front face, 121 ... front chassis, 121a ... rear face, 121b ... bolt hole, 122a ... rear face, 122b ... bolt hole, 122d ... fastening bolt, 125 ... fastening pin , 126 ... pin hole, 130 ... rear chassis, 130a ... front face, 130b ... bolt hole, 130c ... rear face, 130d ... fastening bolt, 135 ... fastening pin, 136 ... pin hole, 140 ... earth removal device (attachment), DESCRIPTION OF SYMBOLS 141 ... Earth removal apparatus (attachment), 142 ... Fastening bolt, 144 ... Earth removal board, 210 ... Central chassis (small), 150, 151 ... Outrigger apparatus (attachment), 152 ... Outrigger float, 153 ... Rotating shaft, 155 ... fastening bolts, 160 ... rear outrigger device (attachment), 161 ... outrigger cylinder, 162 ... oil Hose, 163, 164 ... hydraulic connector, 165 ... hydraulic hose, 181, 182 ... axle holding bracket, 210a ... front, 210b ... rear, 211a, 211b ... bolt hole, 215 ... pin hole, 216 ... bracket, 218 ... bracket, 219 ... Pin hole, 310 ... Top plate, 311, 312 ... Side plate, 313 ... Bottom plate, 314 ... (Rear side) end plate, 315 ... (Front side) End plate, 320 ... Top plate, 321, 322 ... Side plate, 323 ... Bottom plate, 324 ... (rear side) end plate, 325 ... (front side) end plate, 326 ... (rear side) end plate, 327 ... (front side) end plate, 328, 329 ... end plate, 331 ... (front side) end plate 332 (rear side) end plates, 341 to 344 side plates, 345, 347, 352.

Claims (5)

An upper swing body having a cab on which an operator is boarded and a work machine used for work, and a lower traveling body having a front wheel and a rear wheel that are connected to each other via a swing wheel provided on the upper swing body and the round body portion. In a wheeled work vehicle equipped with
The lower traveling body includes a chassis that extends in the front-rear direction and includes the round body. The chassis is connected to a central chassis that includes the round body, and a front portion of the central chassis. The front chassis having a mounting portion and the rear chassis connected to the rear portion of the central chassis and having the rear wheel axle mounting portion have a three-part structure, and the front chassis can be attached to the front side attachment at the front end. A wheeled work vehicle, wherein the rear chassis is formed so that a rear attachment can be attached to a rear end thereof.   2. The wheeled work vehicle according to claim 1, wherein a connection portion between the central chassis and the front chassis is in the vicinity of a portion where the width direction length W of the chassis is smallest in the front-rear direction.   A hydraulic hose connection for guiding pressure oil to a front attachment connected to the front chassis is formed in the vicinity of the connection between the central chassis and the front chassis, and the rear in the vicinity of the connection between the central chassis and the rear chassis. The wheel type work vehicle according to claim 1 or 2, wherein a connecting portion of a hydraulic hose for guiding pressure oil to a rear attachment connected to the chassis is formed.   4. The front attachment connected to the front chassis and the rear attachment connected to the rear chassis are any one of a soil removal device, an outrigger device, a crumb pipe, and a bolt-on attachment. The wheel type work vehicle according to item 1.   The connection between the central chassis and the front chassis and between the central chassis and the rear chassis is any one of welding, bolt fastening, pin fastening, and combined use of bolt fastening and pin fastening. The wheel type work vehicle according to any one of the above.

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