JP2022148701A - Lower traveling body of construction machine - Google Patents

Abstract

To easily remove hardened sediment even when the sediment is accumulated and hardened on a side frame.SOLUTION: On an upper side of a side frame 15 of a lower traveling body 11, a first sediment avoiding member 24 and a second sediment avoiding member 27 for partially avoiding sediment S accumulated on the side frame 15 are attachably/detachably provided. Accordingly, a destruction space 26 can be formed in the accumulated sediment S by removing the first sediment avoiding member 24 after the sediment S is accumulated on the side frame 15. In addition, other destruction space can be formed in the accumulated sediment S by removing the second sediment avoiding member 27.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to an undercarriage of a construction machine that travels by revolving crawler belts.

A hydraulic excavator, which is a representative example of construction machinery, includes a self-propelled undercarriage, an upper revolving body rotatably provided on the lower carriage, and a rotatable front portion of the upper revolving body. a working device;

The lower traveling body includes a center frame positioned in the center of the lower traveling body, side frames provided on both left and right sides of the center frame and extending in the front-rear direction, and driving wheels provided at one ends of the side frames in the longitudinal direction. , an idler wheel provided at the other end in the length direction of the side frame, a crawler belt wound around the drive wheel and the idler wheel, and a crawler belt provided on the upper side of the side frame and supporting the crawler belt from below. and an upper roller.

At a site where a hydraulic excavator works, earth and sand accumulate on the upper surface of the side frame of the undercarriage. Accumulated earth and sand hinder the revolving motion of the crawler belt and the rotating motion of the upper roller. For this reason, hydraulic excavators need to periodically remove the sediment deposited on the side frames. In this case, when the earth and sand accumulated on the side frames are dry, the earth and sand can be removed relatively easily. However, if the soil containing moisture dries after being deposited, the soil will harden in a tightly adhered state, requiring time and effort to remove the soil.

Therefore, in some hydraulic excavators, the top surface of the side frame is inclined to prevent the sediment from accumulating. In addition, some hydraulic excavators are configured to prevent the deposition of earth and sand by covering the side frames with plastic mudguards to which earth and sand do not easily adhere (Patent Document 1).

JP-A-11-268671

Among hydraulic excavators, a so-called large-sized hydraulic excavator is designed so that the attachment position of the side frame with respect to the center frame can be moved in the width direction. Specifically, by arranging the left and right side frames close to each other, it is possible to form a narrow width form that is within the width limit when the undercarriage is loaded on a trailer and transported. On the other hand, when the left and right side frames are arranged with a wider interval, it is possible to achieve a wide configuration that improves stability during work.

Thus, in the configuration in which the mounting positions of the side frames are moved with respect to the center frame, the side frames are slid in the width direction with respect to the center frame, and the side frames are fixed to the center frame using bolts. For this reason, the upper surface of the side frame must be flush with the narrow bolt fastening surface and the wide bolt fastening surface, and a flat surface is formed on the upper surface of the side frame. .

Therefore, even if the upper surface of the side frame is covered with a mudguard plate as in Patent Document 1, the sediment accumulated on the flat mudguard plate is entangled with projections such as bolts, steps, upper rollers, and the like. Since it hardens in a state, there is a problem that it takes time and effort to remove the earth and sand.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art described above. To provide a running body.

The present invention comprises a center frame positioned at the center of a vehicle body, side frames provided on both left and right sides of the center frame and extending in the front-rear direction, drive wheels provided at one end in the length direction of the side frames, an idler wheel provided at the other end in the length direction of the side frame; a crawler belt wound around the drive wheel and the idler wheel; and an upper roller for supporting from the lower traveling body of the construction machine. there is

ADVANTAGE OF THE INVENTION According to this invention, even if earth and sand accumulate and harden on a side frame, the hardened earth and sand can be removed easily.

It is a left side view showing a hydraulic excavator applied to an embodiment of the present invention. FIG. 2 is a perspective view showing a lower traveling body in FIG. 1; FIG. 3 is a plan view showing the undercarriage with crawler belts omitted; It is a left view which shows the idler wheel side of a lower traveling body. It is a perspective view which shows the idler wheel side of a lower traveling body. FIG. 6 is a perspective view showing a state in which the first earth and sand avoiding member and the second earth and sand avoiding member are removed from the lower running body in FIG. 5; FIG. 6 is a perspective view showing the first earth and sand avoidance member shown in FIG. 5 alone; FIG. 6 is a perspective view showing a second earth and sand avoidance member in FIG. 5 alone; It is a left view which shows the idler wheel side of a lower traveling body in the state where the earth and sand accumulated around the upper roller. FIG. 10 is a left side view showing a state in which a breaking space is formed by removing the first earth and sand avoiding member from the lower running body shown in FIG. 9;

Hereinafter, as a representative example of the undercarriage of construction machinery according to the embodiment of the present invention, the undercarriage of a hydraulic excavator will be taken as an example and will be described in detail with reference to FIGS. 1 to 10 . Although the front side and the rear side of the lower traveling body change depending on the turning position of the upper rotating body, in this embodiment, the side where the idler wheels are provided is the front side, and the side where the driving wheels are provided is the rear side.

In FIG. 1, a hydraulic excavator 1 includes a lower traveling body 11, an upper revolving body 2 rotatably mounted on the lower traveling body 11, and a rotatable front portion of the upper revolving body 2. and a work device 3 for performing earth and sand excavation work. A cab 4 on which an operator rides is provided on the front left side of the upper revolving body 2 . The hydraulic excavator 1 of this embodiment is, for example, a large-sized model in which the width dimension of the upper revolving body 2 is the maximum dimension within the width limit when loaded on a trailer and transported.

Next, the configuration of the lower traveling body 11 of the hydraulic excavator 1 will be described in detail.

The crawler-type lower traveling body 11 has a width dimension larger than the width dimension of the upper revolving body 2 so as to stably support the upper revolving body 2 and the working device 3 . However, if the width dimension of the lower traveling body 11 is made larger than the width dimension of the upper revolving body 2, the width dimension of the lower traveling body 11 exceeds the width limit during transportation. Therefore, the lower running body 11 is arranged such that the mounting position of the side frames 15 relative to the center frame 12, which will be described later, can be moved in the width direction. Specifically, by arranging the left and right side frames 15 close to each other, the width dimension of the lower traveling body 11 is reduced to be within the width limit for transportation.

The lower traveling body 11 is for traveling on uneven ground, muddy ground, and the like. As shown in FIG. 2, the undercarriage 11 includes a center frame 12, left and right side frames 15, driving wheels 17, idler wheels 18, crawler belts 19, upper rollers 20, lower rollers 21, front leg covers 22, and rear legs. It comprises a cover 23 , a first earth and sand avoiding member 24 and a second earth and sand avoiding member 27 .

As shown in FIG. 3 , the center frame 12 is provided at the center of the lower traveling body 11 . The center frame 12 is formed as a substantially H-shaped can manufacturing structure as a whole by welding a plurality of steel plates. The upper rotating body 2 is attached to the upper side of the center frame 12 so as to be able to rotate. The center frame 12 has a front leg 13 positioned on the front side and extending in the left-right direction, and a rear leg 14 positioned on the rear side and extending in the left-right direction.

The front leg 13 has a flange portion 13A that faces an upper surface 15E of a side frame 15, which will be described later. there is Like the front leg 13, the rear leg 14 has a flange portion 14A and a plurality of bolt insertion holes (not shown).

The side frames 15 are provided on both left and right sides of the center frame 12 so as to extend in the front-rear direction. The side frames 15 are arranged symmetrically on both left and right sides of the center frame 12 . The side frame 15 is formed in a rectangular tubular shape by an upper plate 15A, a lower plate 15B, an outer plate 15C and an inner plate 15D extending in the front-rear direction. The surface of the upper plate 15A is a flat upper surface 15E over a wide area including the portions where the front legs 13 and the rear legs 14 are attached. An idler wheel bracket 15F is provided at the front of the upper plate 15A, the lower plate 15B, the outer plate 15C and the inner plate 15D. A wheel bracket 15G is provided.

The upper plate 15A of the side frame 15 has a plurality of bolt insertion holes ( not shown) are provided.

The upper surface 15E of the side frame 15 configured in this way is brought into contact with the flange portion 13A of the front leg 13 and the flange portion 14A of the rear leg 14 of the center frame 12, and the bolts provided on the flange portions 13A and 14A are inserted. A nut (not shown) is fastened to the bolt 16 inserted through the hole and the bolt insertion hole provided in the upper plate 15A. As a result, the side frames 15 can be attached to the front legs 13 and rear legs 14 of the center frame 12 .

In addition, the side frames 15 are laterally displaced with respect to the front legs 13 and the rear legs 14, and the bolts 16 are inserted into different bolt insertion holes and tightened. Or it can be installed by moving inside. That is, when the side frames 15 are arranged on the inner side in the left-right direction, the width of the lower traveling body 11 can be reduced by bringing the left and right side frames 15 closer together. On the other hand, when the side frames 15 are arranged on the outer side in the left-right direction, the width of the lower traveling body 11 can be increased by widening the interval between the left and right side frames 15 .

The drive wheel 17 is provided on a drive wheel bracket 15G located at the rear end, which is one end of the side frame 15 in the length direction. The driving wheels 17 are rotationally driven by a hydraulic motor as a power source. The idler wheel 18 is provided on an idler wheel bracket 15F located at the front end, which is the other end of the side frame 15 in the length direction. Furthermore, the crawler belt 19 is wound over the drive wheel 17 and the idler wheel 18 .

The upper roller 20 is provided above the side frame 15 . The upper roller 20 supports the crawler belt 19 from below. The upper rollers 20 are installed, for example, at three locations across the front leg 13 and the rear leg 14 of the center frame 12 . Since the three upper rollers 20 have the same configuration, the upper roller 20 located on the front side will be described, and the description of the other upper rollers 20 will be omitted.

As shown in FIGS. 5 and 6, the upper roller 20 includes a supporting member 20A attached to the upper surface 15E of the side frame 15 and a roller rotatably supported by the supporting member 20A at a position spaced upward from the upper surface 15E. A main body 20B is provided. Further, a screw seat 20C is provided at the lower portion of the front side of the support member 20A. The screw seat 20C is provided with one or a plurality of, for example, two screw holes (not shown) spaced apart in the left-right direction. Bolts 28 for attaching the front leg cover 22 and the second earth and sand protection member 27, which will be described later, are screwed into these two screw holes.

The lower roller 21 is provided on the lower plate 15B of the side frame 15. As shown in FIG. The lower roller 21 presses the crawler belt 19 against the ground from above. For example, a plurality of, for example, nine lower rollers 21 are provided at intervals in the front-rear direction.

The front leg cover 22 is provided on the side frame 15 so as to cover the front leg 13 of the center frame 12 and the support member 20A of the upper roller 20 located on the front side. The front leg cover 22 includes a large box-shaped large box portion 22A that covers the front legs 13 and the plurality of bolts 16, and a lower portion of the support member 20A that extends forward from the lower front portion of the large box portion 22A. It has a thin box-shaped thin box part 22B that is flat in the vertical direction.

The front leg cover 22 has the large box portion 22A attached to the front leg 13 or the side frame 15 using bolts (not shown). Further, the thin box portion 22B is fastened together with the bracket 27A of the second earth/sand protection member 27 by means of a bolt 28 screwed onto the screw seat 20C of the upper roller 20. As shown in FIG.

Here, the front leg cover 22 is provided with one or more, for example, two screw seats 22C. The two screw seats 22C are arranged on the front side and laterally outside of the large box portion 22A on the upper side of the side frame 15, and on the rear side and laterally outside of the thin box portion 22B. The two screw seats 22C are positioned on the exit side of the space surrounded by the large box portion 22A, the thin box portion 22B, and the roller body 20B of the upper roller 20. As shown in FIG. The two screw seats 22C are provided with screw holes, and the bolts 25 inserted through the bolt insertion holes 24D of the first earth and sand protection member 24 are screwed thereon.

Also, the thin box portion 22B is provided with two bolt insertion holes 22D corresponding to the screw holes at positions overlapping the front side of the screw seat 20C of the upper roller 20. As shown in FIG. As a result, the front portion of the thin box portion 22B is formed by inserting a bolt 28, which will be described later, through the bolt insertion hole 27D and the bolt insertion hole 22D of the second earth and sand avoidance member 27 and screwing it onto the screw seat 20C, thereby forming the upper roller 20. is attached to the support member 20A.

As shown in FIGS. 1 and 2, the rear leg cover 23 is provided on the side frame 15 so as to cover the rear leg 14 of the center frame 12 and the support member 20A of the upper roller 20 positioned on the rear side. there is The rear leg cover 23 is formed so as to be symmetrical with the front leg cover 22 in the front-rear direction, and thus description thereof will be omitted.

Next, the structure and function of the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 as earth and sand avoiding members that characterize this embodiment will be described in detail.

The first earth and sand avoidance member 24 is detachably provided on the upper side of the side frame 15 . The first earth and sand avoiding member 24 is arranged at a position adjacent to the upper roller 20 on the front side. The first earth and sand avoiding member 24 partially avoids the earth and sand S deposited on the side frame 15 .

Specifically, the first earth and sand avoiding member 24 is placed in the space surrounded by the large box portion 22A and the thin box portion 22B of the front leg cover 22 and the roller main body 20B of the upper roller 20 when the earth and sand S accumulate in this space. Due to the pre-existence, sediment S can be partially avoided. In other words, after the earth and sand S have accumulated in the space surrounded by the large box portion 22A and the thin box portion 22B of the front leg cover 22 and the roller body 20B of the upper roller 20, the first earth and sand avoiding member 24 is removed to remove the earth and sand. A rupture space 26, which will be described later, can be formed in the mass of S.

As shown in FIG. 7, the first earth and sand avoiding member 24 is composed of a flat bracket 24A, a projection 24B extending from one surface of the bracket 24A, and a handle 24C provided on the other surface of the bracket 24A. It is configured. The bracket 24</b>A is provided with two bolt insertion holes 24</b>D corresponding to the two screw seats 22</b>C provided on the front leg cover 22 .

The bracket 24</b>A is arranged at an angle when the first earth/sand protection member 24 is attached to the upper side of the side frame 15 . This makes it difficult for earth and sand S to accumulate on the bracket 24A.

Here, the protrusion 24B has a large cross-sectional area on the side of the bracket 24A (base end), which is the outer side in the left-right direction, in the direction of movement when it is removed from the side frame 15, and is broken on the tip side opposite to the bracket 24A. It is formed as a tapered structure that reduces the area.

The first earth and sand avoiding member 24 has a projecting portion 24B extending in the left-right direction at the corner between the front surface of the large box portion 22A and the upper surface of the thin box portion 22B of the front leg cover 22, and the bracket 24A is attached to the screw seat 22C. face it. In this state, the bolt 25 inserted through the bolt insertion hole 24D is screwed into the screw seat 22C. As a result, the first earth and sand avoiding member 24 is positioned near the upper roller 20 where the removal operation is required when the earth and sand S accumulates, that is, between the large box portion 22A and the thin box portion 22B of the front leg cover 22 and the upper roller 20. The protrusion 24B can be installed in advance in the space surrounded by the roller body 20B.

As shown in FIG. 9, when earth and sand S accumulates in the space surrounded by the large box portion 22A and the thin box portion 22B of the front leg cover 22 and the roller main body 20B of the upper roller 20, the bolt 25 is removed. After the removal, the handle 24C is grasped and pulled outward in the left-right direction. As a result, as shown in FIG. 10, a destruction space 26 is formed in the earth and sand S at the portion where the projecting portion 24B is removed. In the work of pulling out the first earth and sand avoiding member 24, since the handle 24C is provided and the projecting portion 24B is formed as a tapered structure, it can be easily pulled out.

Moreover, the first earth and sand avoidance member 24 has a small cross-sectional area on the tip side, that is, the tip side is sharp. Thus, by piercing the earth and sand S with the tip side of the first earth and sand avoiding member 24, it can be used as a tool for breaking down the solidified earth and sand S. Further, when breaking down the earth and sand S using the first earth and sand avoiding member 24, the first earth and sand avoiding member 24 can be easily handled by grasping the handle 24C.

The second earth and sand avoidance member 27 is detachably provided on the upper side of the side frame 15 . The second earth and sand avoiding member 27 is arranged at a position adjacent to the upper roller 20 on the front side. The second earth and sand avoiding member 27 partially avoids the earth and sand S deposited on the side frame 15 .

Specifically, when the earth and sand S accumulate in the space between the thin box portion 22B of the front leg cover 22 and the roller main body 20B of the upper roller 20, the second earth and sand avoiding member 27 is pre-existing in this space. The sedimentary sand S can be partially avoided. In other words, after the earth and sand S have accumulated in the space between the thin box portion 22B of the front leg cover 22 and the roller main body 20B of the upper roller 20, by removing the second earth and sand avoiding member 27, the earth and sand S are collected. Other rupture spaces similar to rupture space 26 described above can be formed.

As shown in FIG. 8, the second earth and sand avoidance member 27 is composed of a flat bracket 27A, a protrusion 27B extending from one surface of the bracket 27A, and a handle 27C provided on the other surface of the bracket 27A. It is configured. The bracket 27A is provided with two bolt insertion holes 27D corresponding to the two screw holes provided in the screw seat 20C of the upper roller 20. As shown in FIG.

The bracket 27A extends vertically when the second earth/sand protection member 27 is attached to the upper side of the side frame 15 . This makes it difficult for earth and sand S to accumulate on the bracket 27A.

Here, the protrusion 27B has a large cross-sectional area on the side of the bracket 27A (base end side), which is the front side, and a small cross-sectional area on the tip side opposite to the bracket 27A in the moving direction when removed from the side frame 15, that is, on the front side. It is formed as a tapered structure.

The second earth and sand avoiding member 27 has a projecting portion 27B extending in the front-rear direction at the corner between the supporting member 20A of the upper roller 20 and the upper surface of the thin box portion 22B, and the bracket 27A is attached to the thin box portion 22B. It faces the screw seat 20C of the upper roller 20. - 特許庁In this state, the bolt 28 inserted through the bolt insertion hole 27D is screwed into the screw seat 20C. As a result, the second earth/sand avoiding member 27 is positioned near the upper roller 20 where removal work is required when the earth/sand S accumulates, that is, between the thin box portion 22B of the front leg cover 22 and the roller main body 20B of the upper roller 20. A protrusion 27B can be installed in advance in the space between them.

When earth and sand S accumulate in the space between the thin box portion 22B of the front leg cover 22 and the roller main body 20B of the upper roller 20, the bolt 28 is removed, and then the handle 27C is grasped and pulled forward. As a result, another destruction space is formed in the earth and sand S at the portion where the projecting portion 27B is removed. In the work of pulling out the second earth and sand avoiding member 27, since the handle 27C is provided and the projecting portion 27B is formed as a tapered structure, it can be easily pulled out like the first earth and sand avoiding member 24. can.

Moreover, the second earth and sand avoidance member 27 has a sharp tip end side, like the protrusion 24B of the first earth and sand avoidance member 24 . Thus, by piercing the earth and sand S with the tip side of the second earth and sand avoiding member 27, it can be used as a tool for breaking down the solidified earth and sand S. Further, when using the second earth and sand avoidance member 27 to crush the earth and sand S, the second earth and sand avoidance member 27 can be easily handled by grasping the handle 27C.

In addition, since the second earth and sand avoiding member 27 is arranged in a recessed position, it may be buried when the earth and sand S accumulate thereon, as shown in FIG. In such a case, the second earth and sand avoidance member 27 is removed after the first earth and sand avoidance member 24 is removed to remove part of the earth and sand S to expose the bracket 27A of the second earth and sand avoidance member 27.例文帳に追加

The hydraulic excavator 1 according to this embodiment has the configuration as described above, and the operation thereof will be described next.

The operator can get on the cab 4, sit in the driver's seat, start the engine, and operate the lever/pedal device for traveling to cause the lower traveling body 11 to travel. On the other hand, the operator can perform the revolving motion of the upper revolving body 2, the earth and sand excavation work by the work device 3, and the like by operating the operation lever device for work (neither is shown). When the hydraulic excavator 1 is traveling or working, earth and sand S may accumulate on the side frame 15 and the like, as shown in FIG.

Therefore, an example of the work for removing the accumulated earth and sand S will be described as an example of the work for removing the earth and sand S accumulated around the upper roller 20 positioned on the front side of the upper side of the side frame 15 .

First, after removing the bolt 25, the operator grabs the handle 24C and pulls it outward in the left-right direction. As a result, as shown in FIG. 10, a breaking space 26 is formed in the deposited earth and sand S. After the first earth and sand avoiding member 24 is pulled out to form a breaking space 26 in the earth and sand S, the earth and sand S is broken by piercing the pulled out first earth and sand avoiding member 24 and another tool such as a crowbar into the earth and sand S. In this case, the breaking space 26 can allow the earth and sand S to collapse downward when the earth and sand S are knocked down from above. In addition, a burr can be inserted into the breaking space 26, and by moving the burr upward or the like, the earth and sand S can be broken up using a lever. In this manner, the solidified earth and sand S can be easily broken by forming the breaking space 26 by pulling out the first earth and sand avoiding member 24 .

After part of the earth and sand S is removed to expose the bracket 27A of the second earth and sand avoiding member 27, the bolt 28 is removed, and then the handle 27C is grasped and the second earth and sand avoiding member 27 is pulled forward. After another destruction space is formed in the deposited earth and sand S, the earth and sand S is destroyed by piercing the earth and sand S with a crowbar, for example. Alternatively, the second earth and sand avoiding member 27 from which the bolt 28 has been removed is held by the handle 27C and pulled outward in the horizontal direction to break the earth and sand S. After destroying the accumulated earth and sand S in this manner, fine earth and sand are removed from the upper side of the side frame 15 .

Thus, according to this embodiment, the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 for partially avoiding the earth and sand S deposited on the side frame 15 are provided on the upper side of the side frame 15 of the lower traveling body 11 . is detachably provided. Therefore, by removing the first earth and sand avoidance member 24 after the earth and sand S have accumulated on the side frame 15, the destruction space 26 can be formed in the accumulated earth and sand S. Further, by removing the second earth/sand avoidance member 27, another breaking space can be formed in the accumulated earth/sand S.

As a result, even when the earth and sand S accumulates and solidifies on the upper side of the side frame 15, the earth and sand S can be destroyed starting from the destruction space 26 and other destruction spaces. As a result, even if the earth and sand S accumulate and harden on the side frame 15, the hardened earth and sand S can be easily removed, and workability can be improved.

Further, in the deposited earth and sand S, two of a destruction space 26 and another destruction space can be formed by the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 . Thereby, the worker can break the solidified sand S more easily, and the workability of the removal work can be improved.

On the other hand, the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 are arranged at positions adjacent to the upper roller 20 . Therefore, the earth and sand S accumulated in the complicated space formed around the upper roller 20 can be easily removed. Moreover, the first earth and sand avoiding member 24 is provided so as to extend in the left-right direction, and the second earth and sand avoiding member 27 is provided so as to extend in the front-rear direction. As a result, the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 can be efficiently arranged in the complicated space formed around the upper roller 20, and in this respect also the work of removing the earth and sand S can be facilitated. Workability can be improved.

The front leg cover 22 positioned above the side frame 15 is provided with a screw seat 22C into which a bolt 25 is screwed for detachably attaching the first earth and sand protection member 24 . Further, the support member 20A of the upper roller 20 located above the side frame 15 is provided with a screw seat 20C into which a bolt 28 is screwed for detachably attaching the second earth and sand avoiding member 27. As shown in FIG. As a result, the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 can be easily attached and detached, and the work of removing the earth and sand S can be performed efficiently.

The projecting portion 24B of the first earth and sand avoiding member 24 and the projecting portion 27B of the second earth and sand avoiding member 27 have a large cross-sectional area on the base end side, which is the moving direction when removed from the side frame 15, and are on the opposite side to the base end side. It is formed as a tapered structure in which the cross-sectional area becomes smaller on the tip end side. Therefore, the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 can be easily pulled out without generating frictional resistance with the earth and sand S. Moreover, since the projections 24B and 27B have sharp tips, the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 can be used as tools for breaking down the earth and sand S.

The first earth and sand avoidance member 24 has a handle 24C that is gripped when it is attached or detached. Thus, the first earth/sand protection member 24 can be easily and reliably handled by gripping the handle 24C. Further, the second earth and sand avoiding member 27 has a handle 27C to be gripped when attaching and detaching. Thus, by gripping the handle 27C, the second earth/sand protection member 27 can be handled easily and reliably.

In the embodiment, the case where the first earth and sand avoiding member 24 and the second earth and sand avoiding member 27 are provided adjacent to the upper roller 20 has been described as an example. However, the present invention is not limited to this, and for example, the earth and sand avoiding member may be provided at a location away from the upper roller as long as it is likely that earth and sand will accumulate.

In the embodiment, the front leg cover 22 is provided with the screw seat 22C for attaching the first earth and sand avoiding member 24, and the upper roller 20 is provided with the screw seat 20C for attaching the second earth and sand avoiding member 27. explained. However, the present invention is not limited to this. For example, when the front leg cover is abolished, a configuration may be adopted in which a screw seat for attaching the first earth and sand protection member is provided on another member such as a side frame. Similarly, a configuration may be adopted in which a screw seat for attaching the second earth and sand protection member is provided on another member such as a side frame.

Further, in the embodiment, the case where the lower traveling body 11 is configured such that the attachment position of the side frame 15 with respect to the center frame 12 can be moved in the width direction has been described as an example. However, the present invention is not limited to this, and the side frames may be attached to the center frame in a non-movable manner.

Furthermore, in the embodiment, the undercarriage 11 of the hydraulic excavator 1 has been described as an example of the undercarriage of the construction machine. However, the present invention is not limited to this, and can be widely applied to undercarriages of other construction machines having crawler belts, such as bulldozers.

1 Hydraulic excavator (construction machinery)
2 Upper revolving body (body)
11 lower running body (body)
12 center frame 15 side frame 17 driving wheel 18 idler wheel 19 track 20 upper roller 20C, 22C screw seat 24 first earth and sand avoiding member (earth and sand avoiding member)
24C, 27C Handle 27 Second earth and sand avoidance member (earth and sand avoidance member)
25, 28 bolt S earth and sand

Claims (5)

A center frame located in the center of the vehicle body,
side frames provided on both left and right sides of the center frame and extending in the front-rear direction;
a drive wheel provided at one end in the length direction of the side frame;
an idler wheel provided at the other end in the length direction of the side frame;
a crawler belt wound around the driving wheel and the idler wheel;
an upper roller provided on the upper side of the side frame and supporting the crawler belt from below;
An undercarriage for a construction machine comprising:
An undercarriage for a construction machine, wherein a sediment avoiding member is detachably provided on the upper side of the side frame for partially avoiding sediment deposited on the side frame. In the undercarriage of the construction machine according to claim 1,
The undercarriage of a construction machine, wherein the earth and sand avoidance member is arranged at a position adjacent to the upper roller. In the undercarriage of the construction machine according to claim 1,
An undercarriage for a construction machine, wherein a screw seat into which a bolt for detachably attaching the earth and sand protection member is screwed is provided on the upper side of the side frame. In the undercarriage of the construction machine according to claim 1,
The earth and sand protection member is formed as a tapered structure having a large cross-sectional area on the base end side in the moving direction when removed from the side frame and a small cross-sectional area on the tip side opposite to the base end side. An undercarriage for construction machinery characterized by: In the undercarriage of the construction machine according to claim 1,
The undercarriage of a construction machine, wherein the earth/sand avoidance member has a handle to be gripped when it is attached or detached.

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