JP3479491B2 - Crawler type traveling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type traveling device used for a traveling device of a vehicle such as a construction machine such as a backhoe.

[0002]

2. Description of the Related Art Conventionally, in a backhoe, a crawler type traveling device is usually used as a traveling device. This crawler type traveling device is provided with idlers, drive wheels, a plurality of track rollers, etc. on side frames on both left and right sides of a track frame that supports a swivel platform so as to be rotatable about a vertical swing axis. A crawler traveling body, which is an endless track, is wound around the crawler traveling body, and the drive wheels are rotationally driven by a hydraulic motor or the like to circulate the crawler traveling body.

The idler is disposed on the front end side of the side frame, the drive wheel is disposed on the rear end side of the side frame, and the track roller is provided between the idler and the drive wheel at an appropriate distance in the front-rear direction at the lower portion of the side frame. It is placed in advance. In this crawler traveling device, a tension device is provided to apply tension to the crawler traveling body and to adjust the tension. This tension device is provided with a yoke that supports an idler, a grease cylinder that is arranged behind this yoke and pushes the yoke to apply tension, and a grease cylinder that is arranged behind this grease cylinder to back up the grease cylinder. It is mainly configured with a compression damper.

The yoke is housed in the front part of the housing part of the side frame so as to be movable back and forth, and an idler is supported in the front part of the yoke rotatably around a shaft center in the left-right direction via a support shaft. The grease cylinder is housed in the front-rear middle part of the housing part of the side frame so as to be movable back and forth, and is inserted into the cylinder body having an oil chamber inside and retractable from the front end opening of this cylinder body to contact the rear surface of the yoke. It has a corresponding cylinder rod and an oil supply plug.

In this grease cylinder, the front and rear positions of the yoke, that is, the idler is adjusted by supplying or discharging grease from the oil supply plug to the oil chamber in the cylinder body to change the amount of protrusion of the cylinder rod from the cylinder body. Thus, it is possible to give or adjust the tension to the crawler traveling body. The compression damper is housed in the rear part of the side frame housing part, and has a pressing plate that contacts the rear surface of the cylinder body, a support shaft whose front end is fixed to the pressing plate, and the rear part of this support shaft in the axial direction. A spring receiving member that has a through hole that is movably inserted and is in contact with the front surface of the rear wall of the storage unit, and is screwed to a male screw portion formed on the rear end side of the support shaft located behind the spring receiving member. It is mainly composed of an adjusting nut capable of adjusting the compression force (backup force) and a compression spring composed of a coil spring or the like interposed in a compression state between the pressing plate and the spring receiving member, and is stored. An insertion hole for inserting the rear end side of the support shaft and the adjustment nut is formed in the center of the rear wall of the portion.

Therefore, the compression damper is interposed between the grease cylinder and the rear wall of the housing portion to elastically back up the grease cylinder.

[0007]

In the crawler type traveling device, in the tension device, the axis of the grease cylinder, the axis of the support shaft and the axis of the compression spring are concentric. In addition, it is considered that it is arranged so as to be orthogonal to the axis of the support shaft that supports the idler.In this case, the bottom wall of the storage part that stores the tension device and the track roller interfere with each other. To prevent this, a cutout opening is formed in the bottom wall of the storage section. However, if the cutout opening is formed in the bottom wall of the storage section, mud will enter the storage section from here.

Further, when the mud enters the storage section, the mud enters between the spring receiving member and the rear wall of the storage section. When the entering mud increases, the spring receiving member may be bent and deformed. This bending deformation occurs in the portion of the spring receiving member that does not directly receive the pressing force of the spring. Note that it is difficult to reduce the diameter of the track roller to avoid interference with the bottom wall of the storage section due to large vibration of the crawler type traveling device or other circumstances. In view of the above problems, it is an object of the present invention to take measures against mud that enters a storage unit that stores a tension device.

[0009]

The technical means taken by the present invention to achieve the above-mentioned object are: an idler provided on one side of the front and rear of the frame; drive wheels provided on the other side; and these idlers. The crawler traveling body is wound around the track roller provided between the driving wheel and the frame, and the compression spring for urging the idler in the tension direction of the crawler traveling body is provided .
On the bottom wall of the storage unit that stores this compression spring,
In a crawl-type traveling device having a notch opening for avoiding interference with a roller, a spring receiving portion of a spring receiving member that receives a back surface of the compression spring receives a pressing force of the compression spring. It is characterized in that a notch is provided around the.

Another technical means is to use a frame
An idler provided on one side of the front and rear, drive wheels provided on the other side,
The crawler traveling body is wound around the idler and the track roller provided between the driving wheels, and the frame is provided with a compression spring for urging the idler in the tension direction of the crawler traveling body , and the compression spring is stored. On the bottom wall of the storage part,
A notch opening is formed to prevent interference with the track roller.
In the crawler type traveling device, the spring receiving member that receives the back surface of the compression spring includes a spring receiving portion that receives the pressing force of the compression spring and a plurality of leg portions that extend from the periphery of the spring receiving portion to position the spring receiving member. It is composed of and.

Another technical means includes an idler provided on one front and rear side of the frame, a drive wheel provided on the other side, and a track roller provided between the idler and the lower portion of the drive wheel. Wrap the crawler running body around the frame,
A crawler type traveling device having a tension device for urging an idler in the tension direction of the crawler traveling body, and a cutout opening portion for preventing interference with a track roller is formed in a bottom wall of a storage portion for accommodating the tension device. In the above, there is provided mud intrusion prevention means for preventing intrusion of mud from the cutout opening.

Another technical means includes an idler provided on one front and rear side of the frame, a drive wheel provided on the other side, and a track roller provided below the idler and the drive wheel. Wrap the crawler running body around the frame,
A crawler type traveling device having a tension device for urging an idler in the tension direction of the crawler traveling body, and a cutout opening portion for preventing interference with a track roller is formed in a bottom wall of a storage portion for accommodating the tension device. In the above, a mud intrusion prevention wall covering above the cutout opening is provided.

Further, another technical means is characterized in that a blocking wall for closing the front and back of the space between the cutout opening and the mud intrusion prevention wall is provided. Another technical means is to run a crawler over an idler provided on one side of the front and rear of the frame, drive wheels provided on the other side, and a track roller provided between the idler and the lower portion of the drive wheel. The body is wrapped around the frame, and the frame is equipped with a tension device that biases the idler in the tension direction of the crawler traveling body.The bottom wall of the storage unit that stores this tension device has a notch opening for avoiding interference with the track rollers. In the crawler type traveling device having the above-mentioned structure, a mud intrusion prevention member is provided before and after the cutout opening to prevent the entry of mud into the storage section from the cutout opening.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 4, reference numeral 1 denotes a backhoe which is exemplified as a turning work machine. The backhoe 1 is mainly composed of an upper turning body 2 and a lower traveling device 3, and a turning base 6 turns around a vertical axis. However, the rear surface side of the swivel base 6 should not extend beyond the lateral width of the traveling device 3,
This is called a small rear small swing backhoe in which the rear surface side of the swivel base 6 is formed in an arc shape in plan view.

The running direction of the backhoe 1 (the left-right direction in FIG. 4) is called the front-rear direction, and the lateral direction orthogonal to this front-back direction (the paper-penetrating direction in FIG. 4) is the left-right direction. The revolving structure 2 includes a revolving base 6 which is supported on a traveling device 3 so as to be revolvable around a vertical revolving axis, a working device (excavation device) 7 provided in front of the revolving base 6, and a revolving base. A driver's seat 8 provided on 6 and an engine, a fuel tank, a hydraulic pump, a hydraulic oil tank, a control valve, a radiator, an oil cooler, a reserve tank, various devices mounted on the swivel base 6 such as a battery. Is configured.

The swivel base 6 has a swivel base plate 22 which is supported on the traveling device 3 via a bearing body 21 so as to be freely swiveled around the vertical axis.
And a swivel frame including a reinforcing member and a mounting member for mounting and fixing various devices and the like on the swivel board 22, and a swivel base 6 front part that is mounted and fixed to a rear portion of the swivel frame. And a counterweight 20 which constitutes a rear part of the swivel base 6 and balances the weight of the swivel base 6 with respect to the working device 7 and the like. Covered by etc.

A pair of upper and lower support brackets 26 are provided on the front part of the swivel board 22 so as to project forward from the swivel base 6,
A swing bracket 27 is supported on the support bracket 26 so as to swing left and right around a vertical axis. A boom 28 rotatably supported by the swing bracket 27 about the horizontal axis, an arm 29 rotatably supported on the tip side of the boom 28 about the horizontal axis, and a tip side of the arm 29. The working device 7 is mainly composed of a bucket 30 squeezed and dumped so that the boom 28, the arm 29, and the bucket 30 are respectively a boom cylinder 31, an arm cylinder 32, and a bucket which are hydraulic cylinders. It is operable by a cylinder 33.

The backhoe 1 of the present embodiment is of a so-called small rear swing type in which the swing locus drawn by the rear end of the swing structure 2 is not deviated from the lateral width and the front-back width of the traveling device 3. However, it may be a standard backhoe in which the excavation device 7 is provided at the front end of the revolving structure 2, and the revolving trajectory drawn by the rear end of the revolving structure 2 projects from the left and right width and the front and rear width of the traveling device. Alternatively, a so-called ultra-small turning type backhoe having the vertical swing axis of the excavating device 7 on the side of the driver's seat 8 on the turning body 2 may be used. The traveling device 3 rotatably supports a drive wheel 10, an idler 11 (idling wheel), a carrier roller 18, and a plurality of track rollers 12 on both left and right sides of a track frame 9, and these are endless made of rubber or iron. The crawler traveling body 4 is wound around the belt, and the drive wheels 10 are driven by a hydraulic motor or the like to circulate and rotate the crawler traveling body 4. Is equipped with a dozer 5.

The track frame 9 is shown in FIGS.
As shown in FIG. 3, the center frame 13 and the side frames 14 arranged at the left and right ends of the center frame 13 are provided. Center frame 1
3 is an upper frame member 15, a lower frame member 16,
The upper and lower frame members 15 and 16 are erected upright between the inner surfaces of the upper and lower frame members 15 and 16 facing each other, and the upper and lower end edges thereof are provided.
A plurality of vertical walls 17A, 17B, 17C fixed to the upper and lower frame members 15, 16 and the vertical wall 17
A, 17B, and 17C are formed of an iron plate, a steel plate, or the like.

That is, in the center frame 13, the upper and lower frame members 15 and 16 are connected to the vertical walls 17A, 17B and 17C.
The three-dimensional structure connected by
7B and 17C serve as ribs for the upper and lower frame members 15 and 16. Center frame 1
3, the central portion is formed in a substantially rectangular shape in plan view,
The revolving structure 3 is rotatably supported on the upper surface thereof via a bearing body 21, and the dozer 5 is supported on the front part thereof.

Specifically, the upper frame member 15 at the center of the center frame 13 is formed with a circular opening 13C penetrating in the vertical direction, and the opening 1
A large number of bolt holes for attaching the bearing body 21 are formed around 3C, and this portion constitutes the bearing body receiving portion A. Further, at the front part of the center of the center frame 13, a support bracket 42 that supports the support arm of the dozer 5 so as to be vertically swingable, and a support bracket 43 that supports a dozer cylinder that raises and lowers the dozer 5 so as to be vertically swingable. And are provided.

On the left and right sides of the center portion of the center frame 13, there are provided leg portions C1, C2, C3 and C4 which project to the left and right and are connected to the left and right side frames 14. The legs C1, C2, C3, C4 are the center frame 1
Left front and rear legs C1 protruding from the left front and rear of the central portion of 3,
C2 and right and left front and rear legs C3, C4 projecting from the right front and rear of the central portion are inclined so as to project to the front or rear, respectively, and the center frame 13 as a whole is flat. It has a substantially X shape when viewed.

The lower frame member 16 is formed of a single plate member from the central portion of the center frame 13 to the four leg portions C1 to C4, while the upper frame member 15 is A central portion 15A where the bearing body receiving portion A is formed and a portion 15 that constitutes the upper surface of the leg portions C1 to C4.
B is formed as a separate member, which is fixed by welding to be integrated. However, both the upper and lower frame members 15 and 16 may be formed of a single plate, or the legs C1 to C1 of the lower frame member 16 may be formed.
C4 may be formed as a separate member. Further, the center frame 13 may be substantially H-shaped in a plan view.

The center frame 13 has the highest center portion, and the legs C1 to C4 are formed so as to be inclined downward so that the center frame 13 becomes lower toward the tips of the four leg portions C1 to C4 from the center portion. The upper and lower thicknesses of the frame 13 are thickest at the central portion and become thinner from the central portion toward the tips of the four leg portions C1 to C4. The vertical walls 33A, 3
3B and 33C are the left and right vertical walls 33A and the rear vertical wall 33B.
And the front vertical wall 30C. Left and right side frames 1
As shown in FIG. 5, reference numeral 4 denotes a main frame 35 which is arranged laterally of the center frame 13 and which is connected to the legs C1, C2, C3, and C4 and which is long in the front-rear direction, and a rear end side of the main frame 35. And a motor holder 36 connected to the left and right rear legs C2 and C4.

In the motor holder 36, a hydraulic motor for driving the drive wheels 10 provided on the outer side surface of the motor holder 36 is housed. The main frame 35 is shown in FIGS.
As shown in FIGS. 3 and 6 to 10, it is mainly configured by an upper wall portion 35A and left and right side wall portions 35B extending downward from both left and right ends of the upper wall portion 35A. The upper wall portion 35A
Has an inclined shape that shifts downward as it extends outward in the left-right direction.

The left and right side wall portions 35 of the main frame 35
The idler 11 is arranged on the front end side between B and the left and right side wall portions 3
The track rollers 12 are arranged at appropriate intervals in the front-rear direction in the lower portion between 5B and are rotatably supported via a support shaft 44, and are mounted on a bracket 37 fixed to an intermediate portion of the upper wall portion 35A in the front-rear direction. A carrier roller 18 is attached. On the front end side of the upper wall portion 35A, a notched groove 3 having a U-shape in a front view in plan view for avoiding interference with the idler 11 is formed.
8 is formed, and the reinforcing plate 3 extending from the upper wall portion 35A to the left and right side wall portions 35B is provided on the rear side of the cutout groove 38.
9 is provided. A guide plate 40 is attached and fixed to the lower portions of the left and right side walls 35B on the front end side.

A tension device 41 shown in FIGS. 2 and 3 is housed in the front portion of each of the left and right main frames 35 in order to apply tension to the crawler traveling body 4 and adjust the tension. This tension device 41
An upper wall 47 that constitutes an upper part of a tension device housing portion 45 (hereinafter, simply referred to as a housing portion) that houses the tension device 41 is provided above the left side wall portion 35B.
The bottom wall 48 constituting the lower part of the storage portion 45 is provided below the tension device 41 by welding or the like, and is fixed to the left and right side wall portions 35B or the like by welding or the like to store the tension device 41. The left and right sides of the portion 45 are configured by the left and right side wall portions 35B of the main frame 35, and the rear wall 49 (supporting wall) is provided at the rear portion of the storage portion 45 and the upper wall portion 35A of the main frame 35 and It is fixed to the left and right side wall portions 35B, the upper wall 47 and the bottom wall 48 of the storage portion 45 by welding or the like.

The front ends of the upper wall 47 and the bottom wall 48 reach the front end of the main frame 35, and the upper wall 47 and the bottom wall 48 are formed.
On the front end side of each of the notch grooves 50 and 51, which are U-shaped in a plan view and have an open front shape, are formed in an open front shape to prevent interference with the idler 11.
Bending pieces 47A, 47B upward from both left and right edges and rear edge of 0
Has been extended. The tension device 41 is an idler 1
1 and a grease cylinder 54 arranged behind the yoke 53 to push the yoke 53.
And a compression damper 55 arranged behind the grease cylinder 54 to back up the grease cylinder 54 and urge the idler 11 in the tension direction of the crawler traveling body 4.

The yoke 53 is housed in the front part of the housing part 45 so as to be movable back and forth, and the idler 11 is housed in the front part of the yoke 53.
Are rotatably supported around a shaft center in the left-right direction via a support shaft 52. The grease cylinder 54 is housed in the front-rear intermediate portion of the housing part 45 so as to be movable back and forth, has an oil chamber inside, and has a cylinder body 54A through which one front and rear guide plate 56 is inserted, and a cylinder body 54A is extended from a front end opening. A cylinder rod 54B, which is removably inserted into contact with the rear surface of the yoke 53, and an oil supply plug 54C are provided.

This grease cylinder 54 is used for the oil supply plug 5
The cylinder body 54 of the cylinder rod 54B by supplying or discharging grease from the 4C to the oil chamber in the cylinder body 54A.
By adjusting the amount of protrusion from A, the front and rear positions of the yoke 53, that is, the idler 11, can be adjusted to give or adjust the tension to the crawler traveling body 4. The compression damper 55 is substantially housed in the rear part of the housing part 45, is located behind the rear guide plate 56 and contacts the rear surface of the cylinder body 54A, and the pressing plate 57.
A support shaft 58 whose front end is fixed, a spring receiving member 59 which has an insertion hole through which a rear portion of the support shaft 58 is axially movably inserted, and which abuts on the front surface of the rear wall 49 of the storage portion.
An adjusting nut 60, which is located behind the spring receiving member 59 and is screwed into a male screw portion formed on the rear end side of the support shaft 58 to adjust the compression force (backup force) of the spring, and the pressing plate 57. It is mainly composed of a compression spring 61 composed of a coil spring or the like that is interposed between the spring receiving member 59 and the spring receiving member 59, and the rear end side of the support shaft 58 is located at the center of the rear wall 49 of the housing portion 45. Also, an insertion hole 49A through which the adjustment nut 60 is inserted is formed.

Therefore, the compression damper 55 is interposed between the grease cylinder 54 and the rear wall 49 of the accommodating portion to elastically back up the grease cylinder 54, and the crawler traveling body 4
The idler 11 is urged in the tension direction. Further, the shaft center of the grease cylinder 54, the shaft center of the support shaft 58, and the compression spring 61.
Is substantially concentric, and its extension line is orthogonal to the shaft center of the support shaft 52 supporting the idler 11.
As shown in FIG. 1, the spring receiving member 59 is made of a plate material, and the spring receiving portion 59 is in contact with and receives the compression spring 61.
A, and a pair of upper and lower leg portions 62A, 62B, 62C, 62D extending radially outward of the compression spring 61 from the spring receiving portion 59A and extending in the left-right direction and the vertical direction. .

The spring receiving portion 59A has a circular shape formed to have a diameter (slightly larger) substantially the same as the outer diameter of the compression spring 61, and an insertion hole 63 for inserting the support shaft 58 is formed in the center portion thereof. There is. The left and right legs 62A and 62B are the side wall 3 of the storage portion.
5B (the side wall 35B of the main frame 35) is abutted to regulate the lateral movement of the spring receiving member 59 (to regulate the left and right positions), and the upper and lower leg portions 62C and 62D are the storage portion upper wall 47 and the storage portion bottom. It contacts the wall 48 and regulates vertical movement (regulates vertical position).

Further, between the leg portions 62A, 62B, 62C and 62D which are adjacent to each other in the circumferential direction of the compression spring 61, there is a notched portion 70 which is widely opened. By providing the notched portion 70, mud is springed. There is no accumulation between the receiving member 59 and the storage part rear wall 49. That is, there is no cutout 70, and therefore the legs 62A, 62B, 62C, 62
If the space between D is continuous, the mud that has entered the storage section 45 enters the space between the spring receiving member 59 and the rear wall 49 of the storage section (mainly the lower side of the spring receiving member 59), and the invading mud When the pressure increases, the intruding mud may press and bend the portion of the compression spring 61 that is not directly pressed by the compression spring 61 in the direction away from the rear wall 49 of the storage portion (forward direction). Since the leg portions 62A, 62B, 62C, and 62D are notched portions 70 that are wide open, the spring receiving member 59 is provided.
The spring receiving member 59 is prevented from being bent and deformed by the mud that has entered between the housing and the rear wall 49 of the storage portion.

The upper and lower leg portions 62C and 62D may be omitted, and the spring receiving portion 59A may be formed to have a slightly larger diameter so that the vertical position of the spring receiving portion 59A may be restricted. As shown in FIGS. 2, 3, and 7 to 10, the storage section bottom wall 48.
A pair of left and right cutout openings 64 and 65 are formed in the front and rear so that the large diameter portions 12A on the left and right sides of the two front track rollers 12 do not interfere with each other. If no measures are taken, the mud enters the storage section 45 through the notch openings 64 and 65. In the present embodiment, however, mud intrusion prevention measures are taken. explain.

If the diameter of the track roller 12 is reduced and the position of the track roller 12 is moved to the lower side, it is not necessary to form the notch openings 64 and 65 in the bottom wall 48 of the storage portion, but the diameter of the track roller 12 is small. If set to, there is a fear of large vibration. Also,
It is not necessary to form the notch openings 64 and 65 in the storage unit bottom wall 48 by moving the tension device 41 to the upper side and moving the storage unit bottom wall 48 upward. The extension line of the shaft center is no longer orthogonal to the support shaft 52 supporting the idler 11, and the yoke 53 and the grease cylinder 5
Moment load is generated between 4 and.

As shown in FIGS. 2 and 7 to 9, the front left and right cutouts 64 (of the front track roller 12) are formed.
A front open U-shaped reinforcing member 66, which is fixed to the lower surface of the housing bottom wall 48 by welding or the like and reinforces the periphery of the cutout groove 51, is provided on the front side. The outer surface side of the portion 66A is formed so as to follow the outer surface shape of the track roller 12, and is made as close to the track roller 12 as possible, so that the inside of the storage section 45 is passed (through) through the left and right notch openings 64 on the front side. We try to prevent mud from entering.

Further, on the rear side (of the front track roller 12) of each of the left and right cutout openings 64 on the front side, the storage section bottom wall 4 is provided.
A baffle plate 67, which is fixed to the lower surface of 8 by welding or the like and extends downward from the lower surface of the bottom wall 48 of the storage portion, is provided. The mud is prevented from entering the storage section 45 through the (through). Therefore, the reinforcing member 66 and the baffle plate 67 serve as a mud intrusion prevention member (mud intrusion prevention means) that prevents the infiltration of mud from the cutout opening 64 into the storage portion 45.

As shown in FIGS. 1, 7 and 10, the rear left and right cutouts 65 (the rear track roller 12
On the upper side, a mud intrusion prevention wall 68 (a mud intrusion prevention means) that covers above the notch opening 65 is provided. The mud intrusion prevention wall 68 is arranged in an inclined shape that moves upward as it goes outward in the left-right direction, and the inner end in the left-right direction contacts the edge of the cutout opening 65, and the outer end in the left-right direction. Is in contact with the storage portion side wall 35B, and the rear end side is in contact with the storage portion rear wall 49. The mud intrusion prevention wall 68 is
It is fixed to the storage part bottom wall 48, the storage part rear wall 49, the storage part side wall 35B, etc. by welding or the like. Also, the mud intrusion prevention wall 68
May be formed integrally with the storage section bottom wall 48. That is, by cutting and raising the storage part bottom wall 48, the mud intrusion prevention wall 6
8 may be formed.

The mud intrusion prevention wall 68 and the cutout opening 65 are also provided.
The rear surface side of the space portion between and is closed by the storage portion rear wall 49 as described above, and thus the storage portion rear wall 4
9 forms a closing wall (a mud intrusion preventing means) that closes the rear surface side of the space between the mud intrusion preventing wall 68 and the notch opening 65. In addition, the mud intrusion prevention wall 68 and the notch opening 65
The front surface side of the space portion between and is closed by a closing wall 69 (a mud intrusion preventing means). The closing wall 69
Is the mud intrusion prevention wall 68, the storage section side wall 35B, the storage section bottom wall 4
It is fixed to 8 etc. by welding or the like.

[0040]

According to the present invention, a notch is provided in a spring receiving member that receives a back surface of a compression spring that biases an idler in a tension direction of a crawler traveling body. The spring receiving member is formed by a spring receiving portion that receives the pressing force of the compression spring and a plurality of legs that project from the periphery and that positions the spring receiving member. It is possible to prevent the spring receiving member from being bent and deformed by the mud that has entered between the support wall and the support wall that backs it up.

Further, the bottom wall of the accommodating portion for accommodating the tension device is closed by blocking the notch opening formed so as to avoid interference with the track roller, or the entry of mud from the notch opening into the accommodating portion is prevented. By providing the mud intrusion prevention member for preventing the mud from entering the storage portion through the cutout opening.

[Brief description of drawings]

FIG. 1 is a front sectional view of a rear portion of a storage portion of a side frame.

FIG. 2 is a side sectional view of a front portion of a side frame.

FIG. 3 is a plan sectional view of a front portion of a side frame.

FIG. 4 is an overall side view of a backhoe.

FIG. 5 is a plan view of a track frame.

FIG. 6 is a front view of a track frame.

FIG. 7 is a side sectional view of a lower front portion of the track frame.

FIG. 8 is a plan sectional view of a front portion of a storage unit.

FIG. 9 is a front cross-sectional view of the front portion of the storage section.

FIG. 10 is a plan sectional view of a rear portion of the storage section.

[Explanation of symbols]

4 crawler running body 10 drive wheels 11 idlers 12 track rollers 14 Side frame 59 Spring receiving member 59A Spring receiver 61 compression spring 62 legs 64 Notch opening 65 Notch opening 66 Reinforcement member (Muddy soil intrusion prevention member) 67 Baffle plate (Muddy soil intrusion prevention member) 68 Mud intrusion prevention wall 69 Blocking wall 70 Notch

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teruo Kunizawa 64 Ishizukita-machi, Sakai-shi, Osaka Inside the Kubota Sakai Plant (72) Inventor Kenzo Koga 64, Ishizukita-machi, Sakai-shi, Osaka Kubota Sakai Manufacturing Co., Ltd. In-house (72) Tomoaki Miyake 64 Ishizukita-machi, Sakai-shi, Osaka In-house at Kubota Sakai Manufacturing Co., Ltd. (56) Reference JP-A-11-91657 (JP, A) Jitsuko Sho 38-18808 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 55/088 B62D 55/10 B62D 55/30 E02F 9/02

Claims (6)

(57) [Claims] 1. A crawler traveling body is wound around an idler provided on one front and rear side of a frame, drive wheels provided on the other side, and a track roller provided between the idler and the drive wheel. frame, comprising a compression spring for biasing the idler into tension direction of the crawler traveling body, the compression spring yield
Avoid interference with the track rollers on the bottom wall of the storage compartment.
In the crawler type traveling device in which a notch opening for forming is formed , a notch is provided around a spring receiving member that receives a back surface of the compression spring and that receives a pressing force of the compression spring. Characteristic crawler type traveling device. 2. A crawler traveling body is wound around an idler provided on one front and rear side of a frame, a drive wheel provided on the other side, and a track roller provided between the idler and the drive wheel. frame, comprising a compression spring for biasing the idler into tension direction of the crawler traveling body, the compression spring yield
Avoid interference with the track rollers on the bottom wall of the storage compartment.
In a crawler type traveling device having a cutout opening for holding, a spring receiving member that receives the back surface of the compression spring is extended from the spring receiving portion that receives the pressing force of the compression spring and the periphery thereof. And a plurality of legs for positioning the crawler type traveling device. 3. A crawler traveling body is wound around an idler provided on one front and rear side of a frame, a drive wheel provided on the other side, and a track roller provided between the idler and the lower portion of the drive wheel. The frame is provided with a tension device for urging an idler in the tension direction of the crawler traveling body, and a cutout opening for avoiding interference with the track roller is formed in the bottom wall of the storage part for storing this tension device. In the crawler type traveling device, a crawler type traveling device is provided with a mud intrusion preventing means for preventing the intrusion of mud from the cutout opening. 4. A crawler traveling body is wound around an idler provided on one front and rear side of a frame, a drive wheel provided on the other side, and a track roller provided between the idler and a lower portion of the drive wheel. The frame is provided with a tension device for urging an idler in the tension direction of the crawler traveling body, and a cutout opening for avoiding interference with the track roller is formed in the bottom wall of the storage part for storing this tension device. In the crawler type traveling device, a crawler type traveling device is provided with a mud intrusion prevention wall that covers above the cutout opening. 5. A method according to claim, characterized in that a closing wall for closing the front and rear of the space between the cutout opening and mud invasion preventing wall
4. The crawler type traveling device according to 4 . 6. A crawler traveling body is wound around an idler provided on one front and rear side of a frame, drive wheels provided on the other side, and a track roller provided between the idler and a lower portion of the drive wheel. The frame is provided with a tension device for urging an idler in the tension direction of the crawler traveling body, and a cutout opening for avoiding interference with the track roller is formed in the bottom wall of the storage part for storing this tension device. In the crawler type traveling device, a crawler type traveling device is provided, before and after the cutout opening portion, with a mud intrusion prevention member for preventing the entry of the mud into the storage portion from the cutout opening portion.