JP2008273310A - Crawler type work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deposition of snow on crawlers of a semi-crawler type tractor for agricultural use. <P>SOLUTION: In a working vehicle having a pair of crawler traveling devices 6 on right and left sides of a vehicle body, a traveling crawler 16 is wound around a driving sprocket 12 to be driven by a rear axle 3 and a front idler wheel 13 and a rear idler wheel 14 supported by a crawler frame 11, a scraper 41 is provided on the crawler frame so as to be located on a front upper part of the rear idler wheel and on a rear lower part of the driving sprocket, and right and left inner ends of right and left scraper plates 41b of the scraper are projected at an obtuse angle and brought close to right and left intermediate parts of the rear idler wheel in plan view. Right and left sides widely extend in a forwardly inclined manner in a flat V-shape forward of the right and left parts of the rear idler wheel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crawler type work vehicle.

In a crawler type agricultural tractor, the drive sprocket is configured to include a disk portion fixed to the drive shaft of the machine body and a drive tooth portion fixed to the disk part, and the drive tooth part is provided on the side surface of the machine body center of the disk unit. A first state in which the interval between the drive teeth of the drive sprocket is reduced, and a second state in which the interval between the drive teeth of the drive sprocket is increased by fixing the drive teeth on the outer surface of the body of the disk portion. The one configured to switch to is known (Patent Document 1).
Japanese Patent Laid-Open No. 11-245859

  The present invention is intended to prevent snow clogging, accumulation, and clogging from occurring on a crawler in a crawler-type work vehicle.

  According to the first aspect of the present invention, in a working vehicle having a pair of crawler travel devices (6, 6) on both right and left sides of the airframe, a drive sprocket (12, 12) driven by the rear axle (3, 3) of the airframe. The traveling crawlers (16, 16) are wound around the front guide wheels (13, 13) and the rear guide wheels (14, 14) supported by the crawler frames (11, 11). 11, 11) is provided with a scraper (41, 41) so as to be located at a front upper part of the rear guide wheel (14, 14) and a rear lower part of the drive sprocket (12, 12), Configuration in which left and right inner ends of left and right scraper plates (41b, 41b) of the scraper (41, 41) project in an obtuse angle toward the left and right intermediate part of the rear guide wheel (14, 14) in a plan view. And A crawler-type work vehicle characterized in that the left and right side portions are widened by extending forward in a flat V shape toward the front of the left and right side portions of the rear guide wheel (14, 14). And

  According to the above configuration, the working vehicle having a pair of crawler traveling devices (6, 6) on both the left and right sides of the airframe includes a drive sprocket (12, 12) driven by the rear axle (3, 3) of the airframe, The left and right traveling crawlers (16, 16) are wound around the front guide wheels (13, 13) and the rear guide wheels (14, 14) supported by the crawler frames (11, 11). 11, 11) is provided with a scraper (41, 41) so as to be located at a front upper part of the rear guide wheel (14, 14) and a rear lower part of the drive sprocket (12, 12). Yes. The scraper (41, 41) is provided with left and right wide left and right scraper plates (41b, 41b), and the snow lifted by the rear guide wheels (14, 14) is transferred to the left and right scraper plates (41b, 41b). 41b) is guided toward the left and right sides from the left and right inner side portions of the left and right rear guide wheels (14, 14).

The invention according to claim 2 is the crawler type work vehicle according to claim 1, wherein the upper edge of the left and right scraper plates (41b, 41b) is configured to be inclined forward and downward in a side view.
According to the above configuration, even when the rear side portion of the crawler frame (11, 11) swings upward during traveling and the left and right scraper plates (41b, 41b) move upward, the upper edge portion of the crawler frame (11, 11) can be seen in a side view. Since it is configured to be inclined forward and downward, collision interference with the drive sprockets (12, 12) located above can be avoided.

  According to the first aspect of the present invention, the snow lifted by the rear guide wheels (14, 14) is guided and removed from the left and right inner sides to the left and right sides by the left and right scraper plates (41b, 41b), and the left and right traveling crawlers (16, 16) are removed. It can be driven smoothly.

  In addition to the effects of the invention of claim 1, the invention of claim 2 can avoid interference between the left and right scraper plates (41b, 41b) and the drive sprocket (12, 12), and can improve durability.

FIG. 1 is an overall side view of a semi-crawler type agricultural tractor equipped with the present invention.
A pair of left and right front wheels 2 and 2 are provided on the front side of the machine body of the agricultural tractor 1, and a pair of left and right crawler traveling devices 6 and 6 are mounted on the left and right rear axles 3 and 3 provided on the rear side of the machine body. 1 and the driver's seat part 7 is covered with a cabin 8. Although not shown, a working machine such as a rotary tiller is connected to the rear side of the machine body via a three-point link mechanism, and is lifted and lowered by a lift arm and a lift rod that are rotated up and down by a hydraulic lifting cylinder. It is configured.

  As shown in FIG. 2, the left and right crawler travel device 6 is driven by the crawler frame 11 that is rotatably attached to the left and right rear axle 3 supporting cylinders in the rear axle case 4 and the rear axle 3. The driving sprocket 12, the front guide wheel 13 supported on the front side portion of the lower frame portion 11b of the crawler frame 11 so as to be movable in the front-rear direction, and the rear guide wheel supported on the rear portion of the lower frame portion 11b of the crawler frame 11 14, a plurality of intermediate rollers 15, which are supported on the lower frame portion 11 b of the crawler frame 11 along the front-rear direction, a drive sprocket 12, a front guide wheel 13, a rear guide wheel 14 and an intermediate wheel. The travel crawler 16 is wound around 15.

Next, the drive sprocket 12 of the crawler traveling device 6 will be described with reference to FIGS. 3 and 4.
The drive sprocket 12 drives a rubber traveling crawler 16 with a core metal to rotate. The drive sprocket 12 is fixed to the base sprocket 12a and bolts 12f and 12f on the left and right sides of the outer peripheral end of the base sprocket 12a. Left and right ring plates 12b, 12c, left and right mounting bolts 12d,..., Left and right nuts 12e,..., 12e,. Are formed by circular collars 12g,... That are fitted and supported so as to cover the space between the left and right ring plates 12b and 12c. The hub portion of the base sprocket 12a is fixed to the hub 3a of the left and right rear axles 3 with bolts and nuts.

  Further, the mounting bolt 12d is configured as a small-sized left and right screw portion on both the left and right sides and a stepped bolt having a large diameter in the middle portion, and both the left and right screw portions are engraved with screws in the same direction. In A), when the left and right nuts 12e, 12e,... Rotate in the clockwise direction, they are configured to receive a force in the tightening direction of the screw to prevent loosening.

  Therefore, the traveling crawler 16 is driven while the left and right intermediate portions of the wide collars 12g,... Adjacent to the rotation direction of the outer peripheral portion of the driving sprocket 12 mesh with the claw portions 16a of the left and right intermediate portions of the traveling crawler 16. When the left and right thread portions of the mounting bolt 12d are both screws in the same direction, and the left and right nuts 12e, 12e,... 12e, 12e,..., Bolts 12f,.

  In addition, left and right ring plates 12b and 12c are fixed to the left and right sides of the wide outer peripheral end portion of the base sprocket 12a with M12 bolts 12f,..., And left and right stepped attachments are provided on the outer peripheral portions of the left and right ring plates 12b and 12c. The bolts 12d,... Are sandwiched and supported so that the left and right screw portions protrude from the left and right sides, and are fixed by, for example, M6 left and right nuts 12e,... And between the left and right ring plates 12b, 12c of the stepped mounting bolts 12d,. The collar 12g is fitted and supported.

  The length of the collar 12g is slightly narrower than the distance between the left and right ring plates 12b and 12c so that the collar 12g can be rotated with respect to the mounting bolt 12d, and the collar 12g is longer than the outer peripheral end surfaces of the left and right ring plates 12b and 12c. The outer peripheral end surface of 12g is positioned on the outer peripheral side in the radial direction, and the left and right ends of the collar 12g, the outer peripheral ends of the left and right ring plates 12b and 12c, and the outer peripheral ends of the left and right nuts 12e and 12e Is configured.

  According to the above configuration, the claw portion 16a of the traveling crawler 16 is not directly received by the sprocket, but is received by the rotating collar 12g, the left and right ends of the collar 12g, the outer peripheral ends of the left and right ring plates 12b and 12c, the left and right nuts 12e, Since the outer peripheral end surface of 12e forms inclined surfaces that are lower on the left and right sides, deformation of the traveling crawler 16 to the inner sides of the left and right sides is facilitated, and wear and cracks can be prevented.

  Also, as shown in FIG. 3, hubs 3a are formed on the left and right sides of the rear axle 3 of the agricultural tractor 1, and the outer surface of the hub 3a of the rear axle 3 is joined to the inner surface of the base sprocket 12a of the sprocket 12. For example, it is detachably attached with eight bolts and nuts 22 of M22. Further, the inner side surface of the hub of the outer axle 23 is joined to the outer side surface of the hub of the base sprocket 12a and attached with, for example, M22 bolts and nuts 24,..., And the bolts and nuts 22,. They are arranged alternately so as not to interfere.

According to the above configuration, the crawler traveling device 6 attached to the hub 3a of the rear axle 3 and the rear wheel (not shown) can be easily replaced.
Also, as shown in FIGS. 3 and 4, the outer peripheral end of the base sprocket 12a is configured as a wide plate that expands on both the left and right sides, and the outer peripheral end is configured as a corrugated uneven portion in a side view. The left and right ring plates 12b, 12c are fixed to the left and right sides of the tip of the convex portion by bolts 12f,... And left and right openings 12h,... Are formed between the concave portions and the lower ends of the left and right ring plates 12b, 12c.

  Further, as shown in FIG. 3A, in the side view, the shape of the concave portion of the base sprocket 12a and the shape of the claw portion 16a of the traveling crawler 16 are similar to each other, and the concave portion is configured to be slightly larger. Is configured so that it does not come into contact with the recess when it is fitted.

  According to the above configuration, even when the claw portion 16a of the traveling crawler 16 is fitted into the recess at the outer peripheral end portion of the base sprocket 12a during driving, the claw portion 16a does not contact the base sprocket 12a, thereby preventing the traveling crawler 16 from being worn. can do. Since the left and right openings 12h are formed between the recess of the base sprocket 12a and the lower ends of the left and right ring plates 12b and 12c, mud or the like caught in the recess of the base sprocket 12a is left and right. , ... can be discharged smoothly to prevent accumulation of mud and the like.

  Further, as shown in FIG. 4, the outer peripheral end of the base sprocket 12a is configured as a wide plate extending to both the left and right sides, and the radial outer peripheral surface of the plate is inclined downward from the center to the left and right sides. The radial outer periphery of the hub portion of the base sprocket 12a is bent toward the left and right outer sides. Therefore, the falling and discharging of mud etc. of the base sprocket 12a can be made smooth to prevent accumulation.

  Further, as shown in FIG. 2A, the front support 13a of the front guide wheel 13 is supported on the crawler frame 11 of the crawler traveling device 6 so as to be adjustable in the front-rear direction, and the front guide wheel 13 is appropriately adjusted by the adjusting bolt 13b. The rear support 14a is fixed to the crawler frame 11 with bolts and nuts so as to be fixed at the adjustment position.

  According to the above configuration, the traveling crawler 16 is loosened by moving the front guide wheel 13 to the rear side by the adjusting bolt 13b with respect to the crawler frame 11 with the base sprocket 12a attached to the rear axle 3, and loosening the traveling crawler 16. Can be attached to the sprocket by moving the left and right sides toward the center, and when the front guide wheel 13 is returned to the front side, the traveling crawler 16 is in a traveling state, and the assembly work is facilitated.

  Further, as shown in FIG. 2, a mounting bracket 26 is attached to the lower rear portion of the cabin 8, and the intermediate frame portion 11a of the crawler frame 11 is supported by the intermediate portion of the swing arm 27 with a shaft 27a. 27 is pivotally connected to the lower frame portion 11b via a shaft 27b, the rear end portion of the swing arm 27 and the mount bracket 26 are connected by a spring 28, and the front side portion of the crawler frame 11 is connected to the lower frame portion 11b. Pressing downward, the ground contact surface is expanded so that the crawler traveling device 6 is always in contact with the ground, and the contact pressure is reduced.

  Also, as shown in FIG. 5, a vertically adjustable stopper 29 is extended upward on the front side of the swing arm 27, and when the horizontal lower frame portion 11b rotates upward by a predetermined angle, the stopper 29 The upper end portion of the contact portion is in contact with the intermediate frame 11a and restricts the crawler frame 11 from rotating upward. Thus, the movement of the spring 28 during reverse travel is restricted, the upward rotation of the front side portion of the crawler travel device 6 is restricted, and the increase in the ground pressure of the crawler is restrained.

Next, based on FIG.2 and FIG.6, the axial support structure to the rear axle 3 of the crawler frame 11 is demonstrated.
A sleeve that integrally connects the front side portions of the inner intermediate frames 11c and 11c of the left and right crawler frames 11 and 11 by the left and right connecting frames 11d and covers the rear axles 3 and 3 at the rear side portions of the inner intermediate frames 11c and 11c. It is supported by the fitting shaft. Further, the outer axles 23 and 23 are fixed to the left and right sides of the left and right base sprockets 12a and 12a with bolts and nuts, and the outer axles 23 and 23 are attached to the cylindrical bodies 11f and 11f of the shaft support frames 11e and 11e. It is pivoted through.

  Left and right bearings 32, 32 are disposed on the left and right sides of the central protrusion 11g of the cylinder 11f, and an inner unitite seal 33a is interposed between the hub 23a of the outer axle 23 and the inner end of the cylinder 11f. Disguise. A large-diameter lid 34 is fitted and attached to the left and right outer surfaces of the cylinder 11f and the left and right sides of the outer axle 23, and a nut 37 is screwed to the end of the outer axle 23 to fix the lid 34. is doing.

  An outer unitite seal 33 b is interposed between the outer end of the cylinder 11 f and the lid 34, and an O-ring 38 is interposed between the inner periphery of the lid 34 and the outer peripheral surface of the outer axle 23. And a lubricating oil inlet 36 is provided between the outer bearing 32 and the outer unitite seal 33b.

According to the said structure, the drive sprocket 12 can be supported firmly, sealing the outer side axle 23 reliably, and durability can be improved.
Next, the structure for preventing snow from adhering to the traveling crawler 16 will be described with reference to FIGS.

  The lower frame portion 11b of the crawler frame 11 is provided with a scraper 41 so as to be positioned at the front upper portion of the rear guide wheel 14 and the rear lower portion of the drive sprocket 12 and is swung above the rear guide wheel 14. It is configured to eliminate the snow on both sides.

  The scraper 41 includes an attachment portion 41a attached to the upper side surface of the lower frame portion 11b with bolts and nuts 42 and 42, and left and right scraper plates 41b and 41b wide in the left-right direction.

  The left and right scraper plates 41b and 41b are formed in a flat V shape in a plan view, and the left and right inner ends thereof are positioned at the left and right intermediate portions of the left and right guide wheel portions 14a and 14a of the rear guide wheel 14 and are rearward. The left and right side portions are inclined so as to be separated from the left and right guide wheel portions 14a and 14a toward the front left and right sides, and the left and right end portions thereof are left and right of the left and right guide wheel portions 14a and 14a. The left and right scraper plates 41b and 41b are configured so as to protrude to the left and right sides from both sides, and are inclined downward so that the left and right inner portions of the left and right scraper plates 41b and 41b are higher in the rear view and lower in the left and right sides. The left and right scraper plates 41b and 41b are attached to the attachment portion 41a on the lower side, and the attachment portion 41a is joined to the upper side surface of the lower frame portion 11b and fixed with bolts and nuts 42 and 42.

  According to the above configuration, when the left and right guide wheel portions 14a and 14a of the rear guide wheel 14 are rotated in the counterclockwise direction in FIG. 7, the snow attached to the left and right guide wheel portions 14a and 14a is moved to the left and right scraper. It is scraped off by the plates 41b and 41b, and is eliminated while being guided to the left and right sides along the left and right scraper plates 41b and 41b that are inclined to the front in the plan view, so that snow falls to the lower frame portion 11b below. Can be reduced. Further, the snow overflowing upward during the removal can escape from the upper side of the left and right scraper plates 41b and 41b to the front side, and the snow can be smoothly eliminated, so that the left and right scraper plates 41b and 41b and the left and right guide wheel portions 14a and 14a The snow can be smoothly removed without the snow being squeezed in between.

  In addition, the left and right scraper plates 41b and 41b are configured to be inclined downward so that the left and right central portions are high and the left and right sides are low when viewed from the front, and the upper edges of the left and right scraper plates 41b and 41b are configured to be inclined forward and downward in a side view. Therefore, even if the rear portion of the lower frame portion 11b swings upward during traveling, collision interference with the drive sprocket 12 positioned above can be avoided.

  Further, as shown in FIG. 8, the attachment portion 41 a of the scraper 41 is provided with a front attachment hole 41 c and a rear attachment hole 41 d that are long in the front-rear direction so that the attachment position of the scraper 41 relative to the crawler frame 11 can be adjusted in the front-rear direction. It is configured. According to the said structure, the space | interval of the scraper 41 and the rear side guide wheel 14 can be adjusted, and it can respond to the adhesion condition of snow.

Next, a configuration for adjusting the left and right widths of the left and right crawler travel devices 6 and 6 will be described with reference to FIGS. 5, 9, and 10.
A spacer 46 is interposed between the inner surface of the hub of the base sprocket 12a of the drive sprocket 12 and the hub 3a of the rear axle 3, and is fixed with bolts and nuts, so that the lateral width is adjusted. . The mount bracket 26 attached to the lower rear portion of the cabin 8 and the lower frame 11 b of the crawler frame 11 are connected to each other by upper and lower swing arms 27 and 27 and a spring 28.

  An intermediate portion of the upper swing arm 27 is pivotally supported by a pin 27a on the inner intermediate frame portion 11c, and a cylindrical portion of the upper swing arm 27 and a cylindrical portion of the lower swing arm 27 are pivotally connected by a pin 27b, thereby lower swing arm. The rear end portion of the upper swing arm 27 is pivotally connected to the lower frame portion 11b by a pin 27c, and the rear end portion of the upper swing arm 27 and the mount bracket 26 are connected by a spring 28.

  Further, when the left and right crawler travel devices 6 and 6 are widened with the spacer 46 interposed, the pivot connecting pins 27b of the upper swing arm 27 and the lower swing arm 27 are long and wide. Change to Then, a washer 47 is interposed in the middle portion of the long pin 27b to pivotally support the cylindrical portion of the upper swing arm 27 and the cylindrical portion of the lower swing arm 27, and left and right stop plates 48, 48 is secured with bolts to prevent it from coming off.

  Moreover, as shown in FIG. 11, the drive sprocket 12 can be removed from the rear axle 3 and a rear wheel 49 can be attached to the rear axle 3 to change to a wheel type tractor. When the wheel type is thus changed, the inner intermediate frames 11c and 11c and the left and right connecting frames 11d of the crawler frames 11 and 11 located inside the left and right rear wheels 49 and 49 are left as they are, and the inner intermediate frame 11c is left as it is. If the outer side of the pin 27a is covered with the cover 50, it is possible to prevent rust and mud from adhering to the pin 27a.

  In addition, as shown in FIG. 12, if the breather 51 is attached to the left and right outer portions of the cylindrical body 11f that supports the outer axle 23, it is possible to prevent damage to the seal due to oil expansion during high-speed and long-time operation.

  Moreover, when attaching the breather 51, you may comprise as shown in FIG. In forming the breather 51 mounting hole 52 in the cylindrical body 11f, the inner small diameter hole 52a and the outer large diameter hole 52b are configured, and the breather 51 is mounted. According to the said structure, even if oil expand | swells at the time of high-speed long-time driving | operation, the rebound to the peripheral part of the breather 51 can be decreased, and the rebound to the cap 51c part can be decreased.

  Moreover, you may comprise the breather 51 as shown in FIG. The left and right bearings 32 and 32 are disposed on the left and right sides of the pillow portion 11h at the center of the left and right of the cylindrical body 11f to support the outer axle 23, and a breather 51 is provided so as to face the pillow portion 11h. The breather 51 is mounted on the cylindrical body 51d, the movable body 51f (constituted by concatenating the cones up and down) disposed in the middle part of the cylindrical body 51d, and the left and right sides of the movable body 51f. The left and right O-rings 51g and 51g, the inner spring 51h and the outer spring 51i mounted inside and outside the moving body 51f, and the inner air hole 51j and the outer air hole 51j provided in the cylinder 51d are configured.

  According to the above configuration, when the internal pressure of the cylinder 11f decreases, the moving body 51f moves inward by the action of the inner spring 51h and the outer spring 51i, and the moving body 51f and the cylinder are formed by the inner portions of the left and right O-rings 51g and 51g. When the space between 51d is closed and the internal pressure of the cylinder 11f rises, the moving body 51f moves to the outside by the action of the inner spring 51h and the outer spring 51i, and is moved by the outer portions of the left and right O-rings 51g and 51g. The space between 51f and the cylinder 51d is closed, air flow is promoted by the air holes 51j and 51j, the internal pressure of the cylinder 11f can be stopped within a predetermined range, and the durability of the breather 51 can be enhanced.

  Moreover, you may comprise the breather 51 as shown in FIG. The breather 51 includes a cylindrical body 51d, a movable body 51f (a shape in which cones are vertically coupled) arranged at an intermediate portion of the cylindrical body 51d, and an inner rubber film attached to the inner side and the outer side of the movable body 51f. 51k, an outer rubber film 51m, inner springs 51h and outer springs 51i mounted inside and outside the moving body 51f, and air moving slits 51n and 51n provided on both upper and lower sides of the moving body 51f. ing. Then, holes 51o and 51o are fitted to the inner and outer conical portions of the moving body 51f at the center of the inner rubber film 51k and the outer rubber film 51m. According to the said structure, the moving body 51f moves in and out by raising / lowering of an internal pressure, and there exists an effect similar to the said embodiment.

As shown in FIG. 16, even if slits 51n having a predetermined length are continuously formed in the upper and lower intermediate portions of the outer peripheral surface of the moving body 51f, the same effects as those of the above-described embodiment are obtained.
Moreover, you may comprise as shown in FIG. A conical portion 51p is provided on the outer side of the cylindrical body 51d of the breather 51 so as to protrude downward, and a hole portion of the rubber film 51q is fitted into the lower protruding portion of the conical portion 51p, so that the outer peripheral portion of the conical portion 51p. A slit 51n having a predetermined length is provided in the upper and lower intermediate portions, and an air moving hole 51s is provided in the outer peripheral portion of the lid of the breather 51. According to the above configuration, the central hole of the rubber film 51q moves up and down by raising and lowering the internal pressure, and the internal pressure is kept constant, and the same effect as in the above embodiment is achieved.

  Moreover, you may comprise as shown in FIG. A plurality of air movement holes 51s,... Are provided on the outer peripheral portion of the lid of the breather 51, an exhaust cylinder 53 is provided to guide the air in the air movement holes 51s,. It is configured to bend downward. According to the said structure, there exists an effect similar to the said embodiment, preventing the penetration | invasion of the mud and water to the breather 51. FIG.

Whole side view of semi-crawler type agricultural tractor Side view, cut back view, cut front view of crawler travel device Side view and cut front view of crawler travel device Cutting front view of crawler traveling device and drive sprocket Side view of crawler traveling device Cut front view of outer axle (A) Side view of the crawler traveling device (B) Cutting plan view Top view, side view and back view of scraper Cutting plan view of crawler traveling device Cut back view of crawler travel device Cutting plan view of rear axle Cut back view of crawler travel device Cut rear view of outer axle Cutting plan view of rear axle, cutting side view of breather Breeder cutting side view, cutting plan view Breeder cutting side view, cutting plan view Breeder cutting side view, cutting plan view Breeder cutting side view, cutting plan view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Agricultural tractor 3 Rear axle 3a Hub 6 Crawler traveling device 11 Crawler frame 12 Drive sprocket 13 Front guide wheel 14 Rear guide wheel 16 Travel crawler 41 Scraper 41b Scraper plate

Claims (2)

  In a working vehicle having a pair of crawler traveling devices (6, 6) on both the left and right sides of the airframe, a drive sprocket (12, 12) driven by a rear axle (3, 3) of the airframe, a crawler frame (11, 11) ), The traveling crawler (16, 16) is wound around the front guide wheels (13, 13) and the rear guide wheels (14, 14) supported by the crawler frame (11, 11). A scraper (41, 41) is provided so as to be positioned at a front upper part of the rear guide wheel (14, 14) and a rear lower part of the drive sprocket (12, 12), and the scraper (41, 41). The left and right scraper plates (41b, 41b) are configured so that the left and right inner ends project in an obtuse angle toward the left and right intermediate portions of the rear guide wheel (14, 14) in a plan view, Above Crawler-type work vehicle, characterized in that the left and right sides flattened V-shape toward the front and wider constructed by extending the inclined forward side induction wheels (14, 14).   The crawler-type work vehicle according to claim 1, wherein upper side edges of the left and right scraper plates (41b, 41b) are configured to be inclined forward and downward in a side view.

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