JP2021133883A - Lower running body of work machine - Google Patents

Abstract

To provide a lower running body of a work machine enhanced in minimum ground clearance and secured in strength without changing a vehicle width.SOLUTION: A lower running body 2 of a work machine comprises: a crawler frame 7 extending in a longitudinal direction of the lower running body; vertical plates 8a and 8b mounted on both front and rear ends of the crawler frame respectively; an idler wheel 10 that is held by a guide frame 9 mounted on the vertical plate 8a at the front side; a sprocket 12 that is held by a running motor housing 11 mounted on the vertical plate 8b at the rear side; and a covering band 13 hung across the idler wheel and the sprocket. The crawler frame 7 and the vertical plates 8a and 8b extend upper than the guide frame 9 and the running motor housing 11. The vertical plates have guide rollers 14 for securing gaps between the crawler frame and the plates and brackets 15 for supporting the rollers, above the guide frame 9 and the motor housing 11 and outside in a longitudinal direction of the crawler frame.SELECTED DRAWING: Figure 5

Description

The present invention relates to a lower traveling body of a work machine.

As a conventional work machine such as a hydraulic excavator, Patent Document 1 describes a first guide roller at a position close to a floating wheel and a second guide roller at a position close to a drive wheel in order to reduce noise during traveling. The track-type traveling device arranged for each is disclosed.

Further, in Patent Document 2, a track receiving member is provided on the bracket of the side frame located near the drive wheel, and the mounting height position of the track receiving member with respect to the track is adjusted between the track receiving member and the bracket. A track-type traveling device provided with height position adjusting means is disclosed.

In such a conventional work machine, the lower traveling body may work over, for example, a ridge in a field. At that time, if high ridges are formed for the purpose of improving soil drainage and cultivating deep-rooted crops, if the minimum ground clearance of the lower traveling body is low, it will not be possible to straddle the high ridges, so at least There was a need for a lower vehicle with a high ground clearance.

Japanese Unexamined Patent Publication No. 2006-151331 Japanese Unexamined Patent Publication No. 9-175453

The first guide roller and the second guide roller of Patent Document 1 are set to have a smaller outer diameter than the upper rolling wheels that support the tracks above the track frame. Therefore, when the height dimension of the traveling device is increased based on the configuration described in Patent Document 1, a large load is applied to the guide roller in connection with the increase in the height dimension, and the strength of the guide roller with respect to the load is applied. There is concern about the shortage of.

Further, when the height dimension of the traveling device is increased by using the track receiving member and the height position adjusting means described in Patent Document 2, there is a problem that the track receiving member comes into contact with the track and wears, which leads to early damage. be.

The present invention has been made in view of the above points, and an object of the present invention is to provide a lower traveling body of a work machine in which the minimum ground clearance is increased and the strength is secured.

In order to achieve the above object, in the present invention, a guide roller for securing a gap with the crawler frame is provided above the floating wheel holding member and the driving wheel holding member and outside the crawler frame in the front-rear direction. bottom.

Specifically, in the first invention, the crawler frames extending in the front-rear direction of the lower traveling body and arranged on the left and right sides of the lower traveling body are connected to the crawler frame to rotatably support the upper rotating body. A car body, vertical plates attached to both front and rear ends of the crawler frame, idle wheels held by a floating wheel holding member attached to the vertical plate on the front side, and a drive attached to the vertical plate on the rear side. The crawler frame and the vertical plate include a drive wheel held by the wheel holding member, the idle wheel, and a crawler band spanned over the drive wheel, and the crawler frame and the vertical plate are more than the idle wheel holding member and the drive wheel holding member. The vertical plate extends upward, and the vertical plate is a guide roller for securing a gap between the crawler frame and the crawler band above the floating wheel holding member and the driving wheel holding member and outside the crawler frame in the front-rear direction. And has a bracket to support the guide roller.

According to the first invention, the crawler frame and the vertical plate extend above the idler wheel holding member and the driving wheel holding member, so that the guide roller can be attached in a state where the strength is secured at a higher position. , The minimum ground clearance can be increased without changing the vehicle width or car body specifications. As a result, it becomes possible to improve the work efficiency of agricultural work and the like. Then, the strength of the lower traveling body is ensured by attaching the bracket and the guide roller to the gap formed above the floating wheel holding member and the driving wheel holding member by extending the crawler frame and the vertical plate. At the same time, a gap is secured between the crawler frame and the vertical plate and the track, the crawler frame and the vertical plate are prevented from interfering with the crawler, and the life of the crawler frame, the vertical plate and the surrounding members is extended. Is possible.

In the second invention, in the first invention, an urging member which is arranged between the left and right side plates of the crawler frame and enables the idler wheel to move in the front-rear direction is further provided, and the lower end of the car body is the said. It is connected to the crawler frame above the upper end of the urging member.

According to the second invention, by connecting the lower end of the car body to the crawler frame above the upper end of the urging member, it is possible to secure a higher ground clearance than before.

In the third invention, in the second invention, the crawler frame has an upper plate connecting the upper portions of the left and right side plates, and the vertical plate has a plate shape in the vicinity of the weld toe in the lower portion of the bracket. A first reinforcing material is provided, and the first reinforcing material is welded to the inner side surface of the vertical plate in the front-rear direction and the upper plate.

According to the third invention, the vertical plate and the bracket are formed by erection of the first reinforcing material on the upper plate of the crawler frame from the vicinity of the weld toe at the lower part of the bracket, which is the position where the load due to the track is applied most on the vertical plate. It is possible to alleviate the load concentrated on the connecting portion of the.

In the fourth invention, in the third invention, the vertical plate includes a plate-shaped second reinforcing material in the vicinity of the weld toe portion at the lower part of the bracket, and the second reinforcing material extends in the front-rear direction. It is welded to the front and rear vertical plates and the left and right side plates.

According to the fourth invention, since the second reinforcing material extends in the front-rear direction from the vicinity of the weld toe at the lower part of the bracket, which is the position where the load due to the track is most applied on the vertical plate, it is formed at the connecting portion between the vertical plate and the bracket. It is possible to alleviate the concentrated load, and further, it is possible to increase the cross-sectional strength of the crawler frame and secure the rigidity.

In the fifth invention, in the fourth invention, the second reinforcing material is welded to the side plate along the lower end of the connecting portion of the car body in the crawler frame.

According to the fifth invention, the second reinforcing material acts more effectively against the load from the car body, and the strength of the crawler frame can be further increased.

In the sixth invention, in the fourth or fifth invention, the first reinforcing material and the second reinforcing material are welded to the vertical plate above the upper end of the urging member.

According to the sixth invention, the strength of the crawler frame can be increased more effectively by providing the first reinforcing member and the second reinforcing member at positions that do not interfere with the urging member.

As described above, according to the present invention, it is possible to raise the minimum ground clearance of the lower traveling body higher than before without changing the vehicle width and the car body, and it is possible to improve the work efficiency of agricultural work and the like. A gap is secured between the crawler frame and the vertical plate and the crawler belt, the crawler frame and the vertical plate can be prevented from interfering with the crawler belt, and the durability of the crawler frame, the vertical plate, and the members around the crawler frame and the vertical plate can be maintained.

It is a schematic side view of the work machine which concerns on embodiment of this invention. It is a schematic front view of the lower traveling body of the work machine which concerns on embodiment of this invention. It is a schematic plan view of the lower traveling body of the work machine which concerns on embodiment of this invention. FIG. 3 is a sectional view taken along line IV-IV of FIG. It is a side view of the lower traveling body of the work machine which concerns on embodiment of this invention. FIG. 4 is a view corresponding to FIG. 4 according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description of the preferred embodiment is merely an example, and is not intended to limit the present invention, its application, or its use.

In some drawings, the traveling direction of the lower traveling body is shown as an anteroposterior direction, the left and right when the lower traveling body is viewed from the front is shown as a left-right direction, and the vertical direction of the lower traveling body is shown as an up-down direction. Unless otherwise specified, explanations will be given in the directions indicated by these arrows. As shown in FIG. 3, in the front-rear direction of the lower traveling body, the direction away from the turning center O is "outside in the front-rear direction", and the direction approaching the turning center O is "inside in the front-rear direction". Further, in the left-right direction of the lower traveling body, the direction away from the turning center O is "outside in the left-right direction", and the direction approaching the turning center O is "inside in the left-right direction".

As shown in FIG. 1, the work machine 1 is, for example, a hydraulic excavator, and includes a crawler-type lower traveling body 2 and an upper rotating body 3 rotatably mounted on the lower traveling body 2. A cab 4 is arranged on the swivel frame 5 of the upper swivel body 3, and an attachment 6 for performing excavation work or the like is attached to the front of the swivel frame 5.

As shown in FIGS. 2 and 3, the lower traveling body 2 includes a car body 20 that rotatably supports the upper rotating body 3 by a swivel bearing 23, and traveling devices 21 and 22 arranged on both left and right sides of the car body 20. And.

The car body 20 is composed of a base portion 24 to which the swivel bearing 23 is attached, and leg portions 25 that are inclined downward from the base portion 24 and extend diagonally to the right front, diagonally to the left, diagonally to the right, and diagonally to the left. There is. The base portion 24 and the leg portion 25 are formed by welding a vertical plate 26c between the upper upper plate 26a and the lower lower plate 26b. The car body 20 is provided so that the four legs 25 are connected to the crawler frames 7 and 7 arranged on the left and right sides of the lower traveling body 2, respectively, and straddle the left and right traveling devices 21 and 22.

The traveling devices 21 and 22 include a crawler frame 7 extending in the front-rear direction of the lower traveling body 2. As shown in FIG. 4, the crawler frame 7 has two frame members 7a and 7b having an upper plate 70 connecting the upper portions of the left and right side plates 71 and 72 and having an open lower portion having a substantially U-shaped downward shape. It is laminated and connected. In the crawler frame 7, the legs 25 of the car body 20 are connected to the side plates 72 on the inner side in the left-right direction. As shown in FIG. 5, a plurality of lower rollers 16 are attached to the lower portion of the crawler frame 7 in the front-rear direction between the left and right side plates 71 and 72. An upper roller 17 is attached to the upper part of the crawler frame 7 substantially in the center. Vertical plates 8a and 8b are attached to both front and rear ends of the crawler frame 7, respectively.

The vertical plates 8a and 8b are welded to the end portion of the crawler frame 7 facing the front-rear direction of the work machine 1. A guide frame 9 as a floating wheel holding member extending toward the front side is attached to the vertical plate 8a on the front side, and the guide frame 9 rotatably holds the idler wheel 10 as the floating wheel. A traveling motor housing 11 as a driving wheel holding member extending toward the rear side is attached to the vertical plate 8b on the rear side, and the traveling motor housing 11 has a traveling motor 19 and rotationally drives the sprocket 12 as a driving wheel. Holds possible. The vertical plates 8a and 8b extend upward from the lower end of the crawler frame 7, and the upper end extends slightly upward from the upper end of the crawler frame 7. The crawler frame 7 and the vertical plates 8a and 8b extend upward from the guide frame 9 and the traveling motor housing 11.

Further, the vertical plates 8a and 8b support the guide roller 14 and the guide roller 14 for securing a gap with the crawler frame 7 above the guide frame 9 and the traveling motor housing 11 and outside the crawler frame 7 in the front-rear direction. The bracket 15 is provided.

The guide roller 14 is a roller having substantially the same size as the lower roller 16, and is provided above the idler wheel 10 and the sprocket 12, respectively. The brackets 15 that support the guide rollers 14 are provided on the outer front and rear sides of the front and rear vertical plates 8a and 8b, respectively, and extend diagonally upward from the vertical plates 8a and 8b to the front side and the rear side. The bracket 15 is composed of a pair of left and right support arms, and these pairs of support arms support the guide roller 14 so as to be sandwiched from the left and right. Since the guide roller 14 supports the track 13 above the crawler frame 7, a large load is applied from the track 13, but the strength is ensured by using a roller having the same size as the lower roller 16. ing.

Further, the vertical plates 8a and 8b are provided with a plate-shaped first reinforcing member 31 and a second reinforcing member 32 in the vicinity of welding toe portions (two X portions in FIG. 5) at the lower part of the bracket.

The first reinforcing member 31 is welded to the inner side surfaces of the vertical plates 8a and 8b in the front-rear direction and the upper plate 70 of the crawler frame 7. That is, the first reinforcing member 31 extends diagonally upward from the vertical plates 8a and 8b in the vicinity of the welding toe portion X at the lower part of the bracket 15, and is welded to the lower side surface of the upper plate 70 of the crawler frame 7.

The second reinforcing member 32 extends in the front-rear direction from the vicinity of the weld toe X below the bracket 15 in the vertical plates 8a and 8b, and extends in the front-rear direction and the front-rear inner surfaces of the front-rear vertical plates 8a and 8b and the left and right side plates of the crawler frame 7. It is welded to 71 and 72. In the present embodiment, since the crawler frame 7 is formed by connecting two substantially U-shaped frame members 7a and 7b vertically, the upper plate of the lower frame member 7a acts as the second reinforcing member 32.

Tracks 13 are laid on the idler wheel 10, the sprocket 12, the upper roller 17, the lower roller 16, and the guide roller 14. Although the track 13 is illustrated in detail only in a part of FIG. 5, a plurality of shoes 13a are connected in an annular shape. The tension of the track 13 is adjusted by an urging member 18 that allows the idler wheel 10 to move in the front-rear direction.

As shown in FIG. 3, the urging member 18 is composed of a spring and a rod, and is arranged between the left and right side plates 71 and 72 of the crawler frame 7 on the front side of the central portion in the front-rear direction of the crawler frame 7. When the tension of the crawler belt 13 is reduced, the idler wheel 10 is pressed forward by the action of the urging member 18, and the tension of the crawler belt 13 is adjusted by increasing the separation distance between the idler wheel 10 and the sprocket 12. As shown in FIG. 4, the lower end of the car body 20 is connected to the side plate 72 of the crawler frame 7 above the upper end of the urging member 18. Further, above the upper end of the urging member 18, the first reinforcing member 31 and the second reinforcing member 32 are welded to the vertical plates 8a and 8b.

In the present embodiment configured as described above, the crawler frame 7 and the vertical plates 8a and 8b are extended above the guide frame 9 which is a floating wheel holding member and the traveling motor housing 11 which is a driving wheel holding member. , The minimum ground clearance higher than before was secured without changing the vehicle width and the specifications of the car body 20. Further, by attaching the guide roller 14 having the bracket 15 to the gap between the crawler frame 7 and the vertical plates 8a and 8b formed by extending the crawler frame 7 and the vertical plates 8a and 8b, the lower traveling body 2 The strength was secured. Further, the guide rollers 14 and the brackets 15 provided above the guide frame 9 and the traveling motor housing 11 and outside the crawler frame 7 in the front-rear direction provide a gap between the crawler frame 7 and the vertical plates 8a and 8b and the crawler belt 13. The guide roller 14 and the bracket 15 are secured, and the crawler frame 7 and the vertical plates 8a, 8b are prevented from interfering with the crawler frame 13 by supporting the crawler frame 13 at a position away from the crawler frame 7 and the vertical plates 8a, 8b. be able to.

Further, even if an obstacle such as a rock is involved, the gap between the crawler frame 7 and the vertical plates 8a and 8b and the track 13 prevents the obstacle from hitting the frame of the upper swing body 3 on which the engine or the like is mounted. Therefore, the risk of damage can be reduced.

By attaching the guide roller 14 to a higher position, the load from the track band 13 is concentrated on the connecting portion of the vertical plates 8a and 8b with the bracket 15 via the bracket 15, but the first reinforcing member 31 is attached to the bracket 15. By welding from the vertical plates 8a and 8b near the weld toe X at the lower part to the lower side surface of the upper plate 70 of the crawler frame 7, the load concentrated on the connecting portion of the vertical plates 8a and 8b with the bracket 15 is alleviated. can do. Further, the second reinforcing member 32 extends in the front-rear direction from the vicinity of the weld toe X below the bracket 15 in the vertical plates 8a and 8b, and the inner side surfaces of the front and rear vertical plates 8a and 8b in the front-rear direction and the left and right sides of the crawler frame 7. By being welded to the side plates 71 and 72 of the above, the load generated at the connecting portion between the car body 20 and the crawler frame 7 can be alleviated. In this way, the first reinforcing material 31 and the second reinforcing material 32 welded into the crawler frame 7 reinforce the vertical plates 8a and 8b at the positions where the load from the track band 13 is most concentrated, and further, the crawler frame 7 The cross-sectional strength can be increased.

(Other embodiments)
The present invention may have the following configuration with respect to the embodiment.

That is, in the above embodiment, as shown in FIG. 4, the crawler frame 7 has an upper plate 70 connecting the upper portions of the left and right side plates 71 and 72 as shown in FIG. Two of the character-shaped frame members 7a and 7b are laminated one above the other and connected to each other, and the upper plate of the lower frame member 7a acts as the second reinforcing member 32. As another embodiment, FIG. As shown in the above, a crawler frame 80 composed of one member may be used. When the crawler frame 80 is composed of one member, the second reinforcing member 832 is welded as a separate member between the left and right side plates 81 and 82 of the crawler frame 80.

The second reinforcing member 832 is along the lower end Y of the connecting portion of the car body 20 in the side plate 82 located inside in the left-right direction, that is, along the portion where the lower plate 26b of the car body 20 is connected to the side plate 82. It is preferable that the side plate 82 is welded to the side plate 82. By welding the second reinforcing material 832 along the lower end Y of the connecting portion of the car body 20, the second reinforcing material 832 acts more effectively against the load from the car body 20, and the crawler frame 80 The strength can be further increased.

Although the work machine 1 is a hydraulic excavator, it is not particularly limited as long as it is a work machine including a crawler type lower traveling body 2.

1 Work machine
2 Lower running body
3 Upper swivel body
4 cab
5 swivel frame
6 attachment
7 crawler frame
8a vertical board
8b vertical board
9 Guide frame (floating wheel holding member)
10 idler wheel (floating wheel)
11 Traveling motor housing (driving wheel holding member)
12 Sprocket (driving wheel)
13 Tracks
14 Guide roller
15 bracket
16 Down wheel
17 Upper wheel
18 Biasing member
20 car body
31 First reinforcement
32 Second reinforcement
70 Top plate
71 side plate
72 side plate
80 crawler frame
81 side plate
82 side plate
832 Second reinforcement
X Weld toe
Lower end of Y connection

Claims (6)

Crawler frames extending in the front-rear direction of the lower traveling body and arranged on the left and right sides of the lower traveling body,
A car body that is connected to the crawler frame and supports the upper swivel body so that it can swivel.
Vertical plates attached to the front and rear ends of the crawler frame, respectively,
The floating wheel held by the floating wheel holding member attached to the vertical plate on the front side, and
The drive wheels held by the drive wheel holding member attached to the vertical plate on the rear side,
The crawler belt spanning the floating wheel and the driving wheel is provided.
The crawler frame and the vertical plate extend upward from the floating wheel holding member and the driving wheel holding member.
The vertical plate includes a guide roller and a guide roller for securing a gap between the crawler frame and the crawler band above the floating wheel holding member and the driving wheel holding member and outside the crawler frame in the front-rear direction. A lower traveling body of a work machine characterized by having a supporting bracket. In the lower traveling body of the work machine according to claim 1,
Further provided with an urging member arranged between the left and right side plates of the crawler frame and allowing the idler wheel to move in the front-rear direction of the lower traveling body.
A lower traveling body of a work machine, wherein the lower end of the car body is connected to the crawler frame above the upper end of the urging member. In the lower traveling body of the work machine according to claim 2.
The crawler frame has an upper plate that connects the upper portions of the left and right side plates.
The vertical plate is provided with a plate-shaped first reinforcing material in the vicinity of the welding toe portion at the lower portion of the bracket, and the first reinforcing material is welded to the inner side surface in the front-rear direction of the vertical plate and the upper plate. The lower traveling body of the work machine characterized by that. In the lower traveling body of the work machine according to claim 3.
The vertical plate includes a plate-shaped second reinforcing material in the vicinity of the weld toe at the lower portion of the bracket, and the second reinforcing material extends in the front-rear direction of the lower traveling body, and the front-rear vertical plate and left and right. A lower traveling body of a work machine, characterized in that it is welded to the side plate of the above. In the lower traveling body of the work machine according to claim 4.
The lower traveling body of the work machine, wherein the second reinforcing material is welded to the side plate along the lower end of the connecting portion of the car body in the crawler frame. In the lower traveling body of the work machine according to claim 4 or 5.
The lower traveling body of the work machine, wherein the first reinforcing material and the second reinforcing material are welded to the vertical plate above the upper end of the urging member.

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