JP5132483B2 - Crawler travel device - Google Patents

Description

  The present invention relates to a crawler traveling device that can be mounted on a rear portion of a tractor.

For example, some crawler traveling devices constitute a semi-crawler tractor by installing as a rear wheel of a tractor or instead of a rear tire wheel.
In the prior art of this type of crawler traveling device, for example, as disclosed in Patent Document 1, the track frame 2 can freely swing with respect to the rear axle case 34 of the traveling machine body 29 via the swing shaft 8. The front and rear driven wheels 3 and 4 are disposed at the front and rear end portions of the track frame 2, and three free-wheeling wheels 5 in the front and rear direction are provided in the middle portion. In a crawler traveling device in which driving wheels 6 to which power is transmitted from a rear axle 33 supported by an axle case 34 are arranged, and a crawler 7 is wound around the driving wheels 6, front and rear driven wheels 3, 4 and idler wheels 5. The two idler wheels 5 on the rear side of the idler wheel 5 are pivotally supported on the equalizer link 20, and the front and rear middle portions of the equalizer link 20 are pivotally supported on the track frame 2 via the pivot shaft 22. (Claimed Circumference).
JP 2008-168876 A

In the prior art, since the track frame is narrower than the wheel rolling surface of the crawler, the earth and sand deposited on the inner peripheral surface of the crawler, the adhering earth and sand is lifted by the running of the crawler, and directly on the wheel rolling surface, It may be difficult to remove the circulating earth and sand from the wheel rolling surface, once it is piled up on the upper surface of the track frame and may be caught between the wheel and the wheel rolling surface while the earth and sand circulate. is there.
In particular, in the case of a plurality of freewheeling wheels in the front-rear direction, adhering soil accumulates while the soil is stepped on, and the crawler is likely to be damaged.

An object of the present invention is to provide a crawler traveling device capable of solving such problems of the prior art.
An object of the present invention is to provide a crawler traveling device that removes soil adhering to the two idle wheels on the rear side in the left and right direction so that damage to the crawler can be prevented.

Specific means for solving the problems in the present invention are as follows.
First, the track frame 2 is swingably supported via the swing shaft 8 with respect to the rear axle case 34 of the traveling body 29, and the front and rear driven wheels 3 and 4 are disposed at the front and rear ends of the track frame 2. In addition, a plurality of front and rear idler wheels 5 are provided in the middle, and a drive wheel 6 for transmitting power from the rear axle 33 supported by the rear axle case 34 is disposed above the middle of the truck frame 2 in the front and rear direction. And a crawler 7 is wound around the driving wheel 6, the front and rear driven wheels 3, 4 and the idler wheel 5.
The two idler wheels 5 on the rear side of the idler wheel 5 are arranged in a pair on the left and right sides of the equalizer link 20 and are pivotally supported on the front and rear parts of the equalizer link 20, respectively. The middle part of 20 is pivotally supported on the track frame 2 via the pivot shaft 22,
The said equalizer link 20, a left idle scraper 45 capable dropping attachment soil idle wheel 5 close simultaneously on the surface to roll on the crawler 7 of idle wheel 5 side two wheels after the left, A right-side idler scraper 45 capable of dropping the soil attached to the idler wheel 5 in close proximity to the surface of the idler wheel 5 of the right rear wheel 5 that rolls on the crawler 7;
The left and right idle scraper 45 is vertically moved with respect to the equalizer link 20 via a fastener 46 directly below the pivot shaft 22 so that the front-rear distance between the idle wheel 5 on the rear two wheels can be adjusted simultaneously. It is characterized in that the position can be adjusted freely .

Secondly, the left and right idle scraper 45 is formed separately, is arranged with the equalizer link 20 interposed therebetween, and is fastened together with a fastener 46 penetrating the equalizer link 20 .
Thirdly, the left and right idle scraper 45 is integrally formed, and is attached to the left and right scraper action portions 45a that are simultaneously close to the rear two idler wheels 5 and the equalizer link 20 and below the equalizer link 20. Left and right attachment portions 45b connected on the side, and the fastener 46 penetrates the left and right attachment portions 45b and the equalizer link 20 .
[Action]
The crawler traveling device configured as described above has the following effects.
A pair of left and right rear driven wheels 4 are arranged on the track frame 2 with a rear end portion interposed therebetween, and a plurality of front and rear wheel idler wheels 5 provided in the middle part are also arranged in a pair of left and right sides. The left and right wheel rolling surfaces 7a are rolled.

The left and right idler wheels 5 protrude leftward and rightward from the track frame 2, and the earth and sand on the inner peripheral surface of the crawler are lifted by the crawler 7 and are tracked in the vicinity of the rear two idler wheels 5. It falls on the upper surface of the frame 2.
When the earth and sand are placed on the left and right wheel rolling surfaces 7a, the idler wheel 5 steps on it, and the earth adheres to the idler wheel 5, and a pair of left and right idler scrapers 45 provided on the equalizer link 20 are attached to this attached earth. The soil is dropped to the left and right outer sides from the left and right wheel rolling surfaces 7a. Further, the idle scraper 45 can remove the earth and sand falling between the front and rear idle wheels 5 to the left and right outer sides without dropping to the left and right wheel rolling surfaces 7a.

The left and right idle scraper 45 is provided directly below the pivot shaft 22 so that the vertical position can be adjusted with respect to the equalizer link 20, and the proximity position with respect to the front and rear two idler wheels 5 can be adjusted simultaneously.
Also, the pair of left and right idle scrapers 45 can be easily mounted by fastening them together with the fasteners 46 with the equalizer link 20 in between.

  According to the present invention, it is possible to prevent the crawler from being damaged by removing the soil adhering to the two idler wheels on the rear side in the left-right outward direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 8, a tractor T equipped with the crawler traveling device 1 as a rear wheel constitutes a traveling body 29 including an engine 26, a transmission case 27, a front axle frame 28, and the like as steered wheels that can be driven by the front axle frame 28. The front wheel 30 is mounted, the engine 26 is covered with a bonnet 31, the cabin 32 or the lops is mounted, the control part and the driver's seat are covered, and the hydraulic device and the three-point link mechanism are provided at the rear part of the traveling body 29. A rear working machine such as a rotary cultivator is pulled and attached.

1 to 8, a crawler traveling device 1 includes a track frame 2 formed of square material, plate material, pipe material, and the like. A plurality of intermediate idler wheels 5 are arranged and supported in the front-rear direction, a drive wheel 6 is arranged above the idler wheel 5, a crawler 7 is wound around all the wheels, and the track frame 2 is attached to the drive wheel 6 It is configured to be swingable around a swing shaft 8 that is parallel to and below the shaft core.
The front driven wheels 3 are a pair of left and right, and are rotatably supported by a free end of a downwardly inclined tension adjusting mechanism 9 provided on the upper surface of the front end of the track frame 2 via a support shaft 3A.

The tension adjusting mechanism 9 includes a support body 11 fixed to an inclined base 35 that is inclined forward and downward on the upper surface of the track frame 2, and is supported by the support body 11 so as to be slidable in the longitudinal direction. A shaft support 10 that supports the shaft, a tension spring 12 that repels the shaft support 10 toward the front driven wheel 3, and a crawler 7 that moves the shaft support 10 toward the front driven wheel 3 to extend. And a slack correcting means 13 for absorbing.
As shown in FIGS. 2 and 4, the track frame 2 has a pair of left and right side plates 2b fixed on a bottom plate 2a formed of a flat plate, an upper plate 2c fixed on the left and right side plates 2b, and the upper plate 2c. A boss body 2d that is loosely fitted to the swing shaft 8 is fixedly formed.

A support shaft 4A of the rear driven wheel 4 is rotatably supported at the rear end of the track frame 2 via a pair of left and right bearing bodies 14, and the rear driven wheel 4 has a rear end portion of the track frame 2. A pair of left and right are arranged on both sides.
The idler wheel 5 has a smaller diameter than the front driven wheel 3 and the rear driven wheel 4, and is arranged on the track frame 2 via the wheel shaft 5A, and the front and rear wheels 5 are arranged in pairs. Thus, it forms a Matagi rolling wheel and rolls on the left and right wheel rolling surfaces 7 a of the crawler 7 together with the front and rear driven wheels 3 and 4.

The front two wheels and the rear two wheels of the four front and rear idler wheels 5 form a set, and each idler wheel 5 of each set has a wheel shaft 5A connected to an equalizer link (seesaw frame) 20. It is pivotally supported at the front and rear ends. A midway portion of the equalizer link 20 is pivotally supported by a bracket 21 fixed to the track frame 2 via a pivot shaft 22 so that the seesaw can swing.
The bracket 21 is bolted to the lower surface of the bottom plate 2a of the track frame 2. The left and right ends of the pivot shaft 22 are supported by the bracket 21, and the boss portion 20a of the equalizer link 20 is located at the center of the pivot shaft 22 in the left-right direction. It is loosely fitted.

The equalizer link 20 is formed with a bearing portion 20b for supporting the front and rear wheel shafts 5A at the lower portion of the portion protruding forward and backward from the boss portion 20a, and the bracket 21 (or the bottom plate 2a) is placed at the upper portion of the portion protruding forward and backward. A stopper portion 20c that contacts and sets the swing angle of the equalizer link 20 is formed.
The front and rear wheel shafts 5 </ b> A may be horizontally arranged at substantially the same height with respect to the pivot shaft 22, but in the embodiment, the front and rear wheel shafts 5 </ b> A are arranged in a triangular manner below the pivot shaft 22. The distance from the pivot shaft 22 to the front and rear idler wheels 5 is set to be the same, but one may be set longer than the other.

1 to 4, the horizontal distance from the swing shaft 8 to the pivot shaft 22 of the rear equalizer link 20 is set shorter than the horizontal distance from the swing shaft 8 to the pivot shaft 22 of the front equalizer link 20. Thus, the load of the track frame 2 is mainly carried by the idler wheels 5 of the rear two wheels rather than the idler wheels 5 of the front two wheels.
The drive wheel 6 is a drive transmission body mounted on the outer end surface of the rear axle (drive shaft) 33, and has a drive pin 6a between the left and right disks. The rear axle 33 is supported by a rear axle case 34 that protrudes left and right from the rear portion of the mission case 27 that constitutes the traveling body 29.

The rear axle case 34 is fixed to the rear side surface of the transmission case 27, and a final transmission case 51 is fixed to the outer end portion of the rear axle case 34. The final transmission case 51 protrudes upward from the rear axle case 34. A final transmission mechanism (final deceleration mechanism) 52 is built in the final transmission case 51, a transmission shaft 53 is supported as an input shaft, and the rear axle 33 is output as an output shaft. The output shaft 55 of the rear wheel differential device 54 is connected to the transmission shaft 53 in the rear axle case 34.
On the upper portion of the rear axle case 34, a support base 59 is provided for mounting the rear column of the cabin or the rear column of the lops.

A mounting base 57 is fixed to the lower surfaces of the rear axle case 34 and the final transmission case 51 via fasteners, and a swing shaft 8 formed in a cylinder on the left and right support bosses 57a of the mounting base 57. Is fixed through. The mounting bases 57 of the left and right crawler traveling devices 1 are connected to each other by a connecting body 58 that passes below the mission case 27.
The lower part of the final transmission case 51 and the mounting base 57 extend to the lower side of the drive wheel 6, and the boss body 2 d of the track frame 2 swings on the swinging shaft 8 between the left and right support bosses 57 a of the mounting base 57. The track frame 2 is supported by the rear axle case 34 through the swing shaft 8 so as to be swingable up and down.

The upper surface of the lower part of the final speed change case 51 extending to the lower side of the drive wheel 6 is inclined to the left and right outward and downward, and a soil drop portion is provided above the mounting base 57 so as to be continuous with the upper surface inclined to the left and right outer downwards. 61 is formed so that earth and sand do not accumulate on the upper surface of the lower part of the final transmission case 51 and the upper surface of the mounting base 57.
An opening for injecting grease into the rocking shaft 8 through the mounting table 57 is formed in the soil drop portion 61 of the mounting table 57, and this opening is closed with a lid member 62.
A guide mechanism 63 for guiding the crawler 7 is provided between the front portion of the mounting base 57 and the support 11 of the tension adjusting mechanism 9. The guide mechanism 63 includes a guide link 65 having one end pivotally supported by the support 11 and pivotally supporting a guide wheel 64, and a connecting link 66 linking the other end of the guide link 65 and the mounting base 57. doing.

The connecting link 66 is formed by a turnbuckle, and the length can be artificially adjusted. The adjusted link length is constant, and the guide ring 64 is pressed against the crawler 7. Even if it vibrates finely, the guide wheel 64 does not follow the vibration.
The center in the left-right direction of the drive wheel 6 substantially coincides with the center in the left-right direction of each of the track frame 2, the front and rear driven wheels 3, 4 and the idler wheel 5, and the center line thereof is the left-right support boss of the mounting base 57. It passes between 57a.

Since the driving wheel 6 is disposed above the idler wheel 5, the front driven wheel 3 and the rear driven wheel 4 are triangularly arranged, and the driving wheel 6 forms an upper apex of the triangle, and the front driven wheel 3 and The rear driven wheels 4 each form a lower vertex. The crawlers (elastic crawler belts) 7 wound around these wheels have a substantially triangular shape (a rice ball shape) in a side view, and the idler wheel 5 is positioned at the bottom of the substantially triangular shape.
The axis of the swing shaft 8 is parallel to and below the axis of the rear axle 33, and may be directly below the rear axle 33, but it is offset by a dimension K forward from directly below the rear axle 33. It is the center of swinging of the track frame 2 in the front-rear direction (vertical direction at the front-rear end).

In the crawler traveling device 1 having a substantially triangular shape when viewed from the side, the horizontal distance from the rear axle 33 to the front driven wheel 3 is set to be longer than the horizontal distance from the rear axle 33 to the rear driven wheel 4. The horizontal distance L 1 from the front driven wheel 3 to the front driven wheel 3 is also set longer than the horizontal distance L 2 from the swing shaft 8 to the rear driven wheel 4.
The shaft center of the swing shaft 8 is located immediately below or in front of the rear axle 33, and the horizontal distance L1 of the front portion from the shaft center of the swing shaft 8 of the crawler travel device 1 is greater than that of the rear portion. If the crawler 7 is lifted when the crawler 7 is lifted, the crawler 7 is balanced with the tension between the driving wheel 6 and the front driven wheel 3 and the rear driven wheel 4. The front part will be lifted so as to be, and if it is grounded in this state, an upward force is applied to the front part of the traveling device. This upward force makes it easy to climb onto an obstacle, and the crawler traveling device 1 can improve traveling performance in the field, and can improve traveling stability and traction force.

As shown in FIG. 1, the front and rear driven wheels 3, 4 are positioned higher than the horizontal tangent line (inner peripheral surface of the crawler 7) on the ground side of the idler wheel 5 by a height adjustment. Even if the front driven wheel 3 moves farther downward from the center side of the crawler 7, the front driven wheel 3 is always present above the tangent line.
The crawler 7 may be an iron crawler, but here, a rubber crawler in which a circumferential tensile body is embedded is used, and a drive pin 6a of the drive wheel 6 is engaged at the center in the width direction of the inner peripheral surface. Engaging protrusions 7b are formed at equal intervals in the circumferential direction, and the left and right sides of the engaging protrusions 7b are wheel rolling surfaces 7a on which the front and rear driven wheels 3, 4 and the idler wheels 5 roll, A lug 7c having a pattern such as a horizontal character or a letter C is formed to protrude. The crawler 7 may be formed by embedding a core metal, which is a tensile body in the width direction, at equal intervals in the circumferential direction.

1 to 7, the rear end of the track frame 2 supports a pair of left and right rear driven wheels 4 via bearings 14, and the upper surface of the upper end of the rear end of the track frame 2 is inclined backward and downward. However, a projection 2A having a mountain shape when viewed from the side is formed on the upper surface, and the rear surface of the projection 2A is an inclined surface 2p inclined downward in the rearward direction, and an inclined surface 2q in which the front surface is inclined downward in the forward direction. Yes.
The inclined surface 2p on the back surface guides the earth falling from the crawler 7 to the rear between the left and right rear driven wheels 4 without dropping left and right, and the earth and sand are as much as possible on the wheel rolling surface 7a. Do not be placed on.

A cover C is provided at the rear of the track frame 2 to cover the upper surface and the left and right side surfaces. The cover C includes a rear upper cover 41 provided at the rear portion of the track frame 2 and side covers 43 provided on the left and right sides. The rear upper cover 41 and the side cover 43 are made of sheet metal (or synthetic resin).
A rear upper cover 41 is mounted on the rear upper part of the track frame 2 so as to be adjacent to the front side of the inclined surface 2p. Thereafter, the upper cover 41 has an upper portion 41u having a mountain shape when viewed from the front, and a lower portion 41d extending downward from both left and right ends of the upper portion 41u to form a pair of left and right vertical walls along the side surface of the track frame 2.

The upper portion 41u has a sloped upper and lower inclined surface 41p on both sides of the chevron and downwardly in the laterally outward direction. The earth and sand falling thereon can be guided to fall from the track frame 2 to the laterally outward side. ing.
In addition, the rear end portions of the upper portion 41u and the lower portion 41d of the rear upper cover 41 have a rising shape along the inclined surface 2q of the protruding portion 2A, and the rear end portion includes the rear upper inclined surface 41p. An eaves portion 41 </ b> A projecting to the vicinity of the outer surface of the left and right rear driven wheels 4 is formed.
As shown in FIGS. 5 to 7, the eaves portion 41A has an upper edge 41Aa at the same height as the top of the upper portion 41u, and a lower end having the same height as the lower ends of the left and right vertical walls from the upper edge 41Aa to the lower portion 41d. 41Ab is inclined downward in the forward direction, and further, a hanging part 41Ac hanging from the lower end 41Ab is formed. The lateral width gradually decreases from the upper edge 41Aa to the lower end 41Ab, and falls on the left and right rear driven wheels 4 The falling earth and sand can be guided to the front side.

A side cover 43 is provided below the rear upper cover 41 on the left and right side surfaces of the track frame 2. This side cover 43 is the second idler wheel 5 from the front of the rear driven wheel 4 (or the third idler wheel 5 from the front as shown by the dotted line in FIGS. 1 and 2 and the solid line in FIG. 6). ) And the left and right side covers 43 have side inclined surfaces 43p that are inclined downward in the left and right outward directions below the mounting portion 43a.
The side inclined surface 43p of the side cover 43 covers at least the left and right upper sides of the idler wheels 5 of the rear two wheels protruding in the left and right outward direction from the track frame 2, and the rear upper inclined surface 41p of the rear upper cover 41 and The earth and sand that have been guided to drop by the eaves portion 41A can be further guided to drop in the left and right directions.

Thereby, even if the earth and sand are guided to the left and right outer direction of the wheel rolling surface 7a and the earth and sand enters the inner peripheral surface side of the crawler 7, the positions of the rear driven wheel 4 and the wheel rolling surface 7a while the earth and sand circulates. Can be gradually eliminated from left to right.
The side cover 43 has an upper mounting portion 43a fastened to the left and right side surfaces of the track frame 2 with bolts and the like, and a stay 48 is provided at the rear end on the lower surface side. doing.
A notch 43b is formed at the rear end portion of the side cover 43 so that a tool for mounting the stay 48 can be inserted, and a rear scraper 42 that can blind the notch 43b is provided.

The rear scraper 42 is provided on the left and right side covers 43 so that the front and rear positions (distance between the rear driven wheels 4) can be adjusted and replaced, and the rear edge of the rear scraper 42 has a side inclined surface 43p. Along and near the rear driven wheel 4, the soil adhering to the rear driven wheel 4 is scraped off and tilted downward in the laterally outward direction, so that the soil falls to the laterally outward direction of the wheel rolling surface 7a. Guide is available.
The equalizer link 20 is provided with a pair of left and right idle scrapers 45 immediately below the pivot shaft 22. The idle scrapers 45 are formed by bending strips formed in an L-shape and are connected to each other. One piece is adjacent to the idler wheels 5 of the rear two wheels at the same time, and the idle wheels 5 are attached. It is a scraper action part 45 a that scrapes off the soil, and another piece is an attachment part 45 b that is attached to the equalizer link 20 and attached thereto.

The equalizer link 20 is formed with a long groove 20d that is vertically long, and is fastened together with a fastener 46 such as a bolt that penetrates the long groove 20d of the equalizer link 20 and the left and right scraper 45.
The left and right idle scraper 45 can be adjusted in the vertical position with respect to the equalizer link 20 by the long groove 20d, and by adjusting the vertical position, the distance from the idler wheel 5 positioned in the front and rear can be adjusted.
Since the left and right idle scraper 45 is attached to the equalizer link 20, even if the equalizer link 20 swings and the idler wheel 5 moves up and down, the positional relationship with the idler wheel 5 remains unchanged and travels. The soil adhering to the idler wheel 5 can be scraped off at all times.

FIG. 9 shows a modification of the present invention, wherein the cover C is integrally formed without forming the rear upper cover 41 and the side cover 43 separately, and one sheet metal is viewed from the front in the left-right direction center. The upper and lower inclined surfaces 41p of the rear upper cover 41 and the connection side surface Cp that also serves as an attachment portion are formed, and the left and right skirts are extended from the lower end of the connection side surface Cp downward to the left and right. Thus, the left and right inclined surfaces 43p of the side cover 43 are formed, and the rear scraper 42 is detachably attached to the rear end of the side cover 43.
The eaves portion 41A is inclined downward in the forward direction from the upper edge 41Aa to the vicinity of the left and right rear upper inclined surface 41p, and further hangs down from the inclined lower end 41Ab to form a hanging portion 41Ac, and the left and right sides from the upper edge 41Aa to the lower edge 41Ab The edge interval is substantially the same.

The idle scraper 45 is formed by connecting the lower ends of the left and right attachment portions 45b, that is, a band plate is bent into a crank shape, and the left and right scraper action portions 45a and the left and right attachment portions 45b are integrated. Molded and fitted to the equalizer link 20 from below.
In the left and right idle scraper 45 of the embodiment and the modified example, the scraper action part 45a is disposed substantially horizontally, but, like the rear scraper 42, may be inclined downward in the left and right directions.
The sediment removal operation in the crawler traveling device 1 having the above-described configuration will be described.

The earth and sand adhering to the inner peripheral surface of the crawler and the adhering earth and sand are rotated around the rear driven wheel 4 by the forward traveling of the crawler 7 and are lifted from the bottom to the top and fall to the rear upper part of the track frame 2. Circulate on the surface.
The earth and sand that has fallen to the upper part of the rear end of the track frame 2 between the left and right rear driven wheels 4 falls rearward by the inclined surface 2p on the back side of the projection 2A, and the crawler inner circumference between the left and right wheel rolling surfaces 7a. It becomes earth and sand which lies on the surface and circulates without being deposited on the track frame 2.
The earth and sand that has fallen on the rear upper cover 41 is guided to fall outward in the left-right direction by the rear upper inclined surface 41p, is excluded from the upper surface of the track frame 2, and does not accumulate.

The earth and sand removed from the upper surface of the track frame 2 by the rear upper inclined surface 41p is further guided to drop outward by the side inclined surfaces 43p of the side covers 43 provided on the left and right side surfaces of the track frame 2, and the rear side 2 It is prevented that the free wheel 5 and the left and right wheel rolling surfaces 7a of the wheel are mounted.
A protuberance 41A at the rear end of the rear upper cover 41 is positioned in front of the inclined surface 2p of the protrusion 2A. The eaves 41A eliminates the sediment falling to the left and right rear driven wheels 4 side. Drop guidance is performed on the side inclined surface 43 p of the side cover 43.

The soil adhering to the left and right rear driven wheels 4 is scraped off by the scraper 42 provided at the rear ends of the left and right side covers 43, and is dropped and guided to the left and right wheel rolling surfaces 7a in the same manner as the side inclined surfaces 43p. Prevents it from appearing.
The soil adhering to the rear two idler wheels 5 is scraped off by a pair of left and right idler scrapers 45 provided on the equalizer link 20, and falls to the left and right outer sides from the left and right wheel rolling surfaces 7a.
Since the earth and sand that have fallen outward from the left and right wheel rolling surfaces 7a on the inner peripheral surface of the crawler 7 are not stepped on by the rear driven wheel 4 and the idler wheel 5, the crawler 7 is not damaged. The earth and sand on the inner peripheral surface of the crawler 7 is circulated by running, but is gradually removed from the crawler 7 by the side inclined surfaces 43p of the left and right side covers 43.

In the present invention, the shape of each member and the positional relationship between the front, back, left, and right in the above embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, if an upward force is applied to the front portion of the crawler traveling device 1 when tension is applied to the crawler 7, the swing shaft 8 is positioned below the center of the drive wheel 6 and slightly rearward from just below. There is no problem, and the idler wheels 5 may support only the rear two wheels with the equalizer link 20 and individually support the remaining two front wheels on the track frame 2.

Further, the cover C may be formed by forming a rear upper inclined surface 41p, a connection side surface Cp, and a side inclined surface 43p on each of the pair of left and right plate members, and fastening or welding the two plate members on the upper part.
Further, the eaves portion 41A of the rear upper cover 41 is formed separately from the member having the left and right rear upper inclined surfaces 41p, and the rear downward piece protrudes rearward and downward from the member having the eaves portion 41A, and then inclines to the lower protrusion portion. The surface 2p may be formed.

It is a side view which shows embodiment of this invention. It is an enlarged side view of the principal part. It is a cross-sectional rear view of a crawler traveling device. It is a cross-sectional back view of the principal part. It is a cross-sectional rear view of a cover and a scraper. It is a perspective view from the side of the principal part of this invention. It is a perspective view from the rear upper direction of the principal part of this invention. It is a side view of the whole tractor. It is a cross-sectional back view which shows the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crawler traveling apparatus 2 Track frame 2A Protrusion part 2p Inclined surface 4 Rear driven wheel 5 Free-wheeling wheel 6 Drive wheel 7 Crawler 8 Oscillating shaft 20 Equalizer link 22 Pivoting shaft 41 Rear upper cover 41A Eave part 41p Rear upper inclined surface 42 Rear scraper 43 side cover 43p side inclined surface 45 idle scraper 46 fastener C cover Cp connection side

Claims (3)

The track frame (2) is swingably supported via the swing shaft (8) with respect to the rear axle case (34) of the traveling machine body (29), and the front and rear ends of the track frame (2) are front and rear. The moving wheels (3, 4) are arranged, and a plurality of idler wheels (5) in the front-rear direction are provided in the middle, and are supported by the rear axle case (34) above the middle in the front-rear direction of the track frame (2). A drive wheel (6) to which power is transmitted from the rear axle (33) is arranged, and a crawler (7) is wound around the drive wheel (6), the front and rear driven wheels (3, 4) and the idler wheel (5). And
The two idler wheels (5) on the rear side of the idler wheel (5) are arranged in a pair on the left and right sides of the equalizer link (20), and the front and rear parts of the equalizer link (20). The equalizer link (20) is pivoted to the track frame (2) via the pivot shaft (22).
On the equalizer link (20), the adhering soil of the idler wheel (5) can fall at the same time close to the surface of the left two idler wheels (5) on the crawler (7) rolling on the left side. The left idler scraper (45) and the right two rear idler wheels (5) on the crawler (7) are simultaneously close to the rolling surface and the dirt on the idler wheel (5) is dropped. A possible right-hand idle scraper (45) ,
The left and right idle scraper (45) can be adjusted at the same time with the rear two idler wheels (5) at the same time by a fastener (46) directly below the pivot shaft (22). The crawler type traveling device is provided so that the vertical position can be adjusted with respect to the equalizer link (20) . The left and right idle scraper (45) is formed separately, is arranged with an equalizer link (20) interposed therebetween, and is fastened together with a fastener (46) penetrating the equalizer link (20). The crawler type traveling device according to claim 1. The left and right idle scraper (45) is integrally formed, and is in contact with the left and right scraper action portions (45a) and the equalizer link (20) adjacent to the rear two idler wheels (5) at the same time, and the equalizer. It has left and right attachment parts (45b) connected on the lower side of the link (20), and the fastener (46) penetrates the left and right attachment parts (45b) and the equalizer link (20). The crawler type traveling device according to claim 1 .

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