JP3808733B2 - Crawler type traveling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crawler type traveling device employed in a traveling unit of a vehicle such as a construction machine such as a backhoe.
[0002]
[Prior art]
The crawler type traveling device employed in the backhoe has a track frame that supports the upper revolving body so as to be able to swivel about a vertical axis.
The track frame is mainly composed of a center frame at the center on which the upper revolving unit is placed, and side frames fixed to the left and right sides of the center frame.
On each of the left and right side frames, a drive sprocket disposed at the rear, an idler disposed at the front, and a plurality of wheels disposed between the drive sprocket and the idler are rotatably supported. At the same time, a crawler belt is wound around the drive sprocket, idler, wheel, etc., and the crawler belt surrounds the side frame, and the drive sprocket is rotated by a hydraulic motor to circulate the crawler belt. It is configured to move forward and backward by rotating.
[0003]
[Problems to be solved by the invention]
However, in the conventional case, since the crawler belt is quite heavy, a relatively large force is required to wrap the crawler belt between the drive wheel and the idler, and the assembly work of the crawler belt is very much. It was troublesome.
The present invention has been made in view of the above-described problems, so that the crawler belt can be easily assembled.
[0004]
[Means for Solving the Problems]
The technical means of the present invention for solving this technical problem is that the driving wheel 10 and the idler 11 are supported on the front and rear sides of the left and right sides of the track frame 9, and the crawler belt extends across the driving wheel 10 and the idler 11. 4 is a crawler type traveling device in which an upper support wall 46 is fixed to the upper part of the opposite side of the inner and outer walls 83 and 84 of the idler holding part 34 of the track frame 9, and the inside and outside of the idler holding part 34 A lower support wall 47 is fixed to a lower portion between the side walls 83 and 84, and a yoke 50 is supported between the upper and lower support walls 46 and 47 so as to be slidable in the front-rear direction. The idler 11 is supported in the yoke 50 in the left-right direction. In the crawler type traveling device attached rotatably through the shaft 51 ,
A bar insertion hole for inserting a bar for winding the crawler belt at a position outside the idler holding portion 34 of the truck frame 9 and vertically disengaged from between the upper support wall 46 and the lower support wall 47 61 is formed.
[0005]
According to another technical means of the present invention, the track frame 9 includes a center frame 13 at a center portion on which the revolving unit 2 is placed, and side frames 14 fixed to the left and right sides of the center frame 13. The bar insertion hole 61 is formed at one end of the outer side wall 84 in the front-rear direction.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a backhoe exemplified as a turning work machine. The backhoe 1 mainly includes an upper turning body 2 (airframe) and a lower traveling device 3, and a turntable 6 is provided around an up and down axis. Is called a small rear small turning backhoe in which the rear surface side of the swivel base 6 is formed in an arc shape in plan view so that the rear surface side of the swivel base 6 does not protrude beyond the lateral width of the traveling device 3 Is.
[0007]
Note that the traveling direction of the backhoe 1 (the left-right direction in FIG. 1) is referred to as the front-rear direction, and the lateral direction orthogonal to the front-rear direction (the paper penetration direction in FIG.
The swivel body 2 includes a swivel base 6 supported on the traveling device 3 so as to be pivotable about a swivel axis in the vertical direction, a work device (excavation device) 7 provided at the front of the swivel base 6, and a swivel base. A driver's seat 8 provided in the engine 6 and various devices mounted on the swivel 6 such as an engine, a fuel tank, a hydraulic pump, a hydraulic oil tank, a control valve, a radiator, an oil cooler, a reserve tank, and a battery. It is configured.
[0008]
The swivel base 6 includes a swivel board 22 that is supported on the traveling device 3 via a bearing body 21 so as to be pivotable about a vertical axis, and for mounting and fixing a reinforcing member, various devices, and the like on the swivel board 22. And a counterweight which is fixedly attached to the rear portion of the swivel frame to balance the weight with respect to the working device 7 and the like at the front portion of the swivel base 6 and constitutes the rear portion of the swivel base 6 20, the left and right side surfaces, the front surface, and the front side of the driver's seat on the upper surface are appropriately covered with a cover body 23 and the like.
[0009]
In addition, the rear part and the right side part on the upper surface side of the turning frame are covered with a bonnet.
A pair of upper and lower support brackets 26 are provided in front of the swivel board 22 so as to protrude forward from the swivel base 6, and a swing bracket 27 is supported on the support bracket 26 so as to be swingable left and right around the vertical axis. ing.
A boom 28 supported by the swing bracket 27 so as to be swingable about the horizontal axis, an arm 29 supported so as to be swingable about the horizontal axis on the tip side of the boom 28, and a tip side of the arm 29. The working device 7 is mainly composed of a bucket 30 attached so as to be capable of squeezing and dumping. The boom 28, the arm 29, and the bucket 30 are a boom cylinder 31, an arm cylinder 32, and a bucket cylinder, which are hydraulic cylinders, respectively. 33 is operable.
[0010]
Note that the backhoe 1 of the present embodiment is a so-called rear small turning type configured such that the turning locus drawn by the rear end of the turning body 2 does not protrude from the left and right widths and the front and rear widths of the traveling device 3. However, it may be a standard backhoe in which the excavator 7 is provided at the front end of the revolving unit 2 and the trajectory drawn by the rear end of the revolving unit 2 protrudes from the left and right widths and the front and rear widths of the traveling device. It is good also as what is called a very small turning type backhoe provided with the up-and-down swing axis of the boom of the excavator 7 in the side of the driver's seat 8 on 2 side.
The traveling device 3 is disposed on the left and right sides of the track frame 9, the driving wheel 10 disposed at the rear, the idler 11 (idling wheel) disposed at the front, and between the driving wheel 10 and the idler 11. A plurality of wheels 12 and a carrier roller 18 are rotatably supported, and a rubber or iron endless belt-like crawler belt 4 is wound around the driving wheel 10, the idler 11, the carrier roller 18 and the rollers 12; A crawler traveling device configured to drive the driving wheel 10 by a hydraulic motor M or the like to circulate and rotate the crawler belt 4 is employed, and a dozer 5 is provided at a front portion of the traveling device 3.
[0011]
As shown in FIGS. 2 to 5, the track frame 9 is roughly configured to include a center frame 13 and side frames 14 disposed on both left and right sides of the center frame 13.
The center frame 13 is erected between the upper frame member 15, the lower frame member 16, and the opposed inner surfaces of the upper and lower frame members 15, 16, and the upper and lower edges thereof are fixed to the upper and lower frame members 15, 16. It has a plurality of vertical walls 17A, 17B, 17C. The upper and lower frame members 15 and 16 and the vertical walls 17A, 17B, and 17C are formed of an iron plate or a steel plate.
[0012]
The vertical walls 17A, 17B, and 17C include left and right side vertical walls 17A, a rear vertical wall 17B, and a front vertical wall 17C.
That is, the main part of the center frame 13 constitutes a three-dimensional structure in which the upper and lower frame members 15 and 16 are connected by the vertical walls 17A, 17B and 17C, and the vertical walls 17A, 17B and 17C are the ribs of the upper and lower frame members 15 and 16. As a role.
The center portion of the center frame 13 is formed in a substantially rectangular shape in plan view. The center frame 13 rotatably supports the swivel body 3 via a bearing body 21 on the upper surface, and a dozer 5 at the front thereof. To support.
[0013]
Specifically, a circular opening 13C penetrating in the vertical direction is formed in the upper frame member 15 at the center of the center frame 13, and a bolt hole for attaching the bearing body 21 around the opening 13C. Are formed, and this portion constitutes the receiving portion A of the bearing body 21.
A pair of left and right support brackets 43 are provided at the center of the center frame 13 at the center in the left-right direction, and a pair of left and right support brackets 42 are provided on both left and right sides of the support bracket 43. Yes.
[0014]
The rear end side of the dozer cylinder that raises and lowers the dozer 5 is pivotally supported by the central support bracket 43 so as to be rotatable about a horizontal axis, and the right and left support brackets 42 swing the dozer 5. The rear end sides of the left and right support arms constituting the frame are pivotally supported so as to be rotatable around a horizontal axis.
As shown in FIG. 1, the dozer 5 is mainly composed of a blade 74 and a swing frame 24 having a blade 74 fixed to the front portion.
The left and right side portions of the center frame 13 have left and right leg portions C1 and C2 that project outward from the center portion in the left-right direction and are connected to the left and right side frames 14, respectively.
[0015]
The lower frame member 16 is formed of a single plate material from the center portion of the center frame 13 to the leg portions C1 and C2, and the leg portions C1 and C2 are formed at the left and right side portions of the lower frame member 16. On the other hand, the upper frame member 15 includes a central portion 15A in which the bearing body receiving portion A is formed and an upper wall 15B made of a plate material constituting the upper surfaces of the leg portions C1 and C2. It is formed as a separate member, which is fixed by welding or the like and integrated.
The center portion of the center frame 13 is positioned higher than the side frame 14, and the legs C1 and C2 (outer portions of the center frame 13) are arranged in the left-right direction as shown in FIGS. It is formed in an inclined shape that moves downward as it goes.
[0016]
However, the upper and lower frame members 15 and 16 may be formed of a single plate, or the leg C1 and C2 components of the lower frame member 16 may be formed of separate members.
As shown in FIG. 3, the left and right side frames 14 are arranged on the side of the center frame 13 and connected to the legs C1 and C2 and are long in the front-rear direction, and the rear end side of the main frame 35 And a motor case 36 provided in the main structure.
The upper surface 35a of the main frame 35 of the side frame 14 is inclined so as to gradually descend toward the outer side so as to be continuous with the upper surface 13a of the outer portion (leg portions C1, C2) of the center frame 13.
[0017]
As shown in FIGS. 4 and 6, the main frame 35 includes an upper wall 82, an inner wall 83 extending downward from the inner side of the upper wall 82 in the horizontal direction, and a lower side of the upper wall 82 from the outer side in the horizontal direction. And an outer wall 84 extending in the main direction.
The upper wall 82 is formed in an inclined shape that moves downward as it goes outward in the left-right direction, and the upper wall 15B (plate material) that constitutes the upper surface of the legs C1, C2 is the inner wall of the upper wall 82 of the main frame 35. The side 82a is polymerized and fixed by welding or the like.
In the lower part of the main frame 35 between the inner and outer walls 83, 84, the wheel 12 is disposed with a space in the front-rear direction, and is supported so as to be rotatable about an axis in the left-right direction.
[0018]
The carrier roller 18 is supported on the upper wall 82 of the main frame 35 so as to be rotatable about a horizontal axis.
A front end portion of the main frame 35 is an idler holding portion 34. As shown in FIGS. 2 to 5 and 6 to 9, the upper wall 82 of the idler holding portion 34 has a notch groove 41 that is open front and U-shaped in plan view in order to avoid interference with the idler 11. A U-shaped reinforcing plate 49 in a plan view is provided inside the notch groove 41.
[0019]
Further, an upper support wall 46 is fixed to the upper portion of the idler holding portion 34 on the opposite side of the inner and outer walls 83 and 84, and the upper support wall 46 also has a U-shape in plan view corresponding to the U-shaped notch groove 41. Notch groove 40 is formed.
A lower support wall 47 is also fixed to a lower portion between the inner and outer walls 83 and 84 of the idler holding portion 34. The lower support wall 47 also has a U-shaped cutout groove 48 corresponding to the U-shaped cutout groove 41. Is formed.
An upper support plate 46A is provided behind the upper support wall 46 between the inner and outer walls 83, 84. A lower support plate 47 </ b> A is provided behind the lower support wall 47 between the inner and outer walls 83 and 84. A bar insertion hole 61 for inserting a crawler belt winding bar is formed at the front end of the outer wall 84 of the side frame 14 (main frame 35).
[0020]
As shown in FIGS. 2, 3, 5, and 7, the motor case 36 is made of a cast product, and more specifically, is made of cast steel. The motor case 36 is made of, for example, lost wax, SC450. The motor case 36 is formed in a box shape having a side wall 63, an upper wall 64, a bottom wall 65, a front wall 66, and a rear wall 67. The side wall 63 has an opening 68 for attachment. The hydraulic motor M is supported on the motor case 36 through the mounting opening 68 so as to protrude inward and outward. A protrusion 69 that protrudes outward is provided at the front end of the motor case 36.
[0021]
The motor case 36 is disposed inward in the left-right direction with respect to the main frame 35, and is fixed to the rear end of the main frame 35 by welding, fasteners, or other fixing means. As a result, the motor case 36 is attached in a rear protruding shape from the rear end of the outer portion of the center frame 13 to the rear end of the main frame 35 of the side frame 14, and the protruding portion 69 is attached to the rear end of the side frame 14. It is held in the box. The upper surface 36 a of the motor case 36, that is, the upper surface of the upper wall 64 and the upper surface of the projecting portion 69 are arranged on the outer portion of the center frame 13 so as to be continuous with the upper surface 13 a of the outer portion of the center frame 13 and the upper surface 35 a of the main frame 35. The upper surface 13a and the upper surface 35a of the main frame 35 are inclined in the same direction. Accordingly, both side portions of the center frame 13 and the upper surface of the side frame 14 are inclined so as to gradually descend toward the outside over substantially the entire region. This inclination extends from the idler holding portion 34 of the main frame 35 of the side frame 14 to the motor case 36.
[0022]
Further, as shown in FIG. 3, the center frame 13 is also inclined so as to gradually descend backward from the upper surface 13 a of the outer portion of the center frame 13 to the upper surface 36 a of the motor case 36.
A hydraulic motor M for driving the drive wheels 10 is held in the motor case 36 so as to protrude outward in the left-right direction, and the drive wheels 10 are attached and fixed to the protruding portions. It is wound around the drive wheel 10, the idler 11, the wheel 12, and the carrier roller 18 so as to enclose it.
[0023]
The drive wheel 10 is rotationally driven by a hydraulic motor M so as to be able to rotate forward and backward. In FIG. 1, the crawler belt 4 circulates counterclockwise by the counterclockwise rotation of the drive wheel 10 and the backhoe 1 moves forward. The crawler belt 4 circulates clockwise by the clockwise rotation of the drive wheel 10 and the backhoe 1 moves backward.
A yoke 50 is supported between the upper and lower support walls 46 and 47 so as to be slidable in the front-rear direction. An idler 11 is rotatably attached to the front portion of the yoke 50 via a support shaft 51 in the left-right direction. ing.
[0024]
As shown in FIGS. 10 to 13, the yoke 50 mainly includes a pair of left and right brackets 52 and a connecting body 53 that connects the rear end sides of the left and right brackets 52. The bracket 52 is a connecting body 53. It is detachably fixed by a fastener 44 such as a bolt.
A bearing portion 55 that supports the support shaft 51 is formed at the front portion of each of the left and right brackets 52. As shown in FIG. 9, the left and right brackets 52 are held by upper and lower support walls 46 and 47 so as to be slidable back and forth.
[0025]
A tension device 57 shown in FIG. 10 is housed in front of each of the left and right main frames 35 in order to apply tension to the crawler belt 4 and adjust the tension.
The tension device 57 is disposed behind the yoke 50 to urge the idler 11 in the tension direction of the crawler belt 4, and is disposed behind the compression damper 60 to push the compression damper 60. The main structure includes a grease cylinder 59. The compression damper 60 and the grease cylinder of the tension device 57 are held movably back and forth between the upper support plate 46A and the lower support plate 47A of the main frame 35.
[0026]
The coupling body 53 of the yoke 50 is made of a cast product together with the left and right brackets 52, and more specifically is made of cast steel. For example, the bracket 52 is composed of FC50 and FCD450, and the connection body 53 is composed of lost wax and SC450. The connecting body 53 connects the pair of left and right side walls 91, the pair of upper and lower upper and lower walls 92, and the pair of left and right side walls 91 and the pair of upper and lower upper and lower walls 92 on the side opposite to the pair of brackets 52 (rear end side). The ceiling wall 93 is provided. Each side wall 91 is formed in a trapezoidal plate shape in which the bracket 52 side is gradually widened, and a pair of left and right side walls 91 is formed by a pair of left and right side walls 91 and a part of a pair of upper and lower upper and lower walls 92. Is formed in a circular arc plate shape.
[0027]
Mounting plate portions 96 project outwardly in the left-right direction at the end portions of the pair of left and right side walls 91 on the bracket 52 side, and the mounting plate portions 96 are on both left and right end portions on the bracket 52 side of the pair of upper and lower walls 92. They are linked together. Each mounting plate 96 is superposed on the end of the bracket 52 on the connecting body 53 side, and each mounting plate 96 is fastened and fixed to the end of the bracket 5 on the connecting body 53 side by a fastener 44. A cylindrical portion 97 is fitted on the top wall 93 of the connection body 53 so that an end portion of a coil spring 100 to be described later is fitted outside.
The compression damper 60 of the tension device 57 includes a mandrel shaft 99 made of bolts and the like, and a coil spring 100 externally fitted to the mandrel shaft 99, and the mandrel shaft 99 is slidable back and forth on the top wall 93 of the connector 53. The nut 101 is screwed into the insertion end portion of the mandrel shaft 99 on the inner side of the coupling body 53 to prevent the top wall 93 from coming off, and the spring receiver 102 is fitted and held on the rear end portion of the mandrel shaft 99. ing. The coil spring 100 is held between the top wall 93 and the spring receiver 102, and the mandrel shaft 99 is pushed forward by the grease cylinder 59, so that the coupling body 53 is urged forward by the coil spring 100. ing.
[0028]
According to the above embodiment, since the motor case 36 is made of cast steel, which is a cast product, the motor case 36 has a complicated shape with high accuracy, unlike the conventional case that is formed by press forming with a sheet metal. Thus, the shape of the motor case 36 can be more accurately matched to the outer portion of the center frame 13 and the side frame 14. Therefore, the upper surface 36a of the motor case 36, that is, the upper surface of the upper wall 64 and the upper surface of the protruding portion 69 are continuous with the upper surface 13a of the outer portion of the center frame 13 and the upper surface 35a of the main frame 35 with high accuracy. The upper surface 13a of the outer side of the center frame 13 and the upper surface 35a of the main frame 35 can be inclined in the same direction. As a result, both side portions of the center frame 13 and the upper surface of the side frame 14 can be inclined so as to gradually descend outward over substantially the entire area. The idler holding portion 34 can be reliably extended to the motor case 36.
[0029]
Further, it gradually descends toward the rear with high accuracy from the upper surface 13a of the outer portion of the center frame 13 to the upper surface 36a of the motor case 36, that is, the upper surface of the upper wall 64 and the upper surface of the protruding portion 69. Can be tilted.
Therefore, even if the soil scraped up by the crawler belt 4 falls forward and adheres to the upper surfaces on the left and right sides of the track frame 9, it falls on both the left and right sides of the track frame 9 due to vibration during traveling. The soil can be discharged to the outside by the inclination of the upper surface of the outer portion of the center frame 13 and the upper surface of the side frame 14 and can be smoothly discharged from the track frame 9.
[0030]
Further, the connecting body 53 of the yoke 50 is made of a cast product together with the left and right brackets 52, and more specifically, is made of cast steel. Unlike the above, the connecting body 53 can be configured in a complicated shape with high accuracy.
Therefore, each upper and lower wall 92 of the connecting body 53 can be easily formed in a trapezoidal plate shape in which the bracket 52 side is gradually widened, and the cylindrical portion is formed by the pair of left and right side walls 91 and a part of the pair of upper and lower upper and lower walls 92. Thus, the pair of left and right side walls 91 can be easily formed into an arc plate shape. In addition, mounting plate portions 96 project outwardly in the left-right direction at the bracket side end portions of the pair of left and right side walls 91, and the left and right end portions on the bracket 52 side of the pair of upper and lower walls 92 at the mounting plate portions 96. They can be linked together. Accordingly, the side wall 91, the upper and lower walls 92, the top wall 93 and the side wall 91 are prevented from easily deforming even when the connecting body 53 is pressed against the left and right brackets 52 by the tension device 57 with a considerably strong force. The attachment plate portion 96 can sufficiently increase the rigidity of the connecting body 53, and can make the connecting body 53 compact and can have a structure capable of holding the coil spring 100 reliably and easily.
[0031]
Further, as shown in FIGS. 3 and 9, since a bar insertion hole 61 for inserting a crawler belt winding bar is formed in the front end portion of the outer wall 84 of the side frame 14, for example, the crawler belt 4, the end of the crawler belt winding bar 105 is inserted into the bar insertion hole 61 and the front end of the crawler belt 4 is inserted into the bar 105 as shown in FIG. The crawler belt 4 can be easily hooked on the idler 11 with a relatively small force by swinging the bar 105 in the direction of arrow a with the bar insertion hole 61 as a fulcrum. It can be easily wound around the drive wheel 10 and the idler 11.
[0032]
In the above embodiment, the motor case 36 is made of cast steel. However, the motor case 36 is not limited to cast steel, and may be made of iron or other cast products (cast).
In the above-described embodiment, the motor case 36 is made of cast steel in the connecting body 53 of the yoke 50. However, the motor case 36 is not limited to cast steel but may be made of iron or other cast products (cast). May be.
Further, in the above embodiment, the bar insertion hole 61 for inserting the crawler belt winding bar is formed at the front end portion of the outer wall 84 of the side frame 14. A bar insertion hole 61 for inserting a crawler belt winding bar may be formed in the rear end portion of the outer wall 84 or the motor case 36. In this case, the bar insertion hole 61 is supported by the crawler belt winding bar 105. The crawler belt 4 may be hooked on the driving wheel 10 instead of the idler 11. Further, the bar insertion holes 61 may be provided on both the front end side and the rear end side of the side frame 14.
[0033]
In the above embodiment, the idler 11 is attached to the front end side of the side frame 14 and the drive wheel 10 is attached to the rear end side. Conversely, the drive wheel 10 is attached to the front end side of the side frame 14. The idler 11 may be attached to the rear end side. In this case, the motor case 36 may be attached to the front end side of the side frame 14.
[0034]
【The invention's effect】
According to the present invention, the end portion of the crawler belt winding bar 105 is inserted into the bar insertion hole 61 and the front end portion of the crawler belt 4 is hung on the bar 105 so that the crawler belt 4 is relatively small by the bar 105. The crawler belt 4 can be easily wound between the driving wheel 10 and the idler 11 by being supported by force, and the assembly operation of the crawler belt 4 can be easily performed.
[Brief description of the drawings]
FIG. 1 is an overall side view of a backhoe.
FIG. 2 is a plan view of a traveling device and the like.
FIG. 3 is a side view of a track frame.
FIG. 4 is a front view of a track frame.
FIG. 5 is a plan view of a track frame.
FIG. 6 is a front sectional view of an outer portion of the track frame.
FIG. 7 is a plan sectional view of a motor case portion of a track frame.
FIG. 8 is a plan view of the front side of the outer side of the track frame.
FIG. 9 is a side view of the front portion of the track frame.
FIG. 10 is a plan view of a holding portion of an idler.
FIG. 11 is a side sectional view of a holding portion of an idler.
FIG. 12 is a plan sectional view of a holding portion of an idler.
FIG. 13 is a perspective view of a holding portion of an idler.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Backhoe 2 Revolving body 3 Traveling apparatus 4 Crawler belt 9 Track frame 10 Drive wheel 11 Idler 13 Center frame 14 Side frame 34 Idler holding part 35 Main frame 36 Motor case 44 Fastening tool 50 Yoke 51 Support shaft 52 Bracket 53 Connection body 61 Bar Insertion hole 91 Side wall 92 Upper and lower walls 93 Top wall 95 Cylindrical portion 96 Mounting plate portion 97 Cylindrical portion 100 Coil spring

Claims (2)

Drive wheels (10) and idlers (11) are supported on the left and right sides of the track frame (9), and a crawler belt (4) is wound around the drive wheels (10) and idlers (11). An upper support wall (46) is fixed to an upper portion of the opposed surface side of the inner and outer walls (83, 84) of the idler holding portion (34) of the track frame (9). A lower support wall (47) is fixed to the lower part between the inner and outer walls (83, 84) of the holding part (34), and the yoke (50) is slidable in the front-rear direction between the upper and lower support walls (46, 47). In the crawler type traveling device, which is supported and the idler (11) is rotatably attached to the yoke (50) via a left and right support shaft (51) ,
A bar for winding the crawler belt on the outer side of the idler holding part (34) of the truck frame (9) at a position vertically deviated from between the upper support wall (46) and the lower support wall (47). A crawler type travel device characterized in that a bar insertion hole (61) for inserting a bar is formed.   The track frame (9) includes a center frame (13) at the center portion on which the revolving body (2) is placed, and side frames (14) fixed to the left and right sides of the center frame (13). The crawler type traveling device according to claim 1, wherein the bar insertion hole (61) is formed on one end side of the outer wall (84) in the front-rear direction.

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