JP2002012174A - Crawler type travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive crawler type travel device allowed to apply lower rollers as a part when replacing the lower rollers. SOLUTION: This crawler type travel device is provided with a truck frame 5 having a pair of left and right side frames 7 for arranging an idler on one end side and arranging a sprocket on the other end side, the plural lower rollers 12 arranged on the under surface side of the respective side frames 7 and a crawler belt 10 extended all the way to the outer periphery of the respective side frames 7, and adjusting members 15 for adjusting an installing position of the lower roller 12 are respectively interposed between an under surface of the respective side frames 7 and the plural lower rollers 12, and the installing position of the respective lower rollers 12 to the side frames 7 can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track-type traveling device used for construction machines such as hydraulic excavators and cranes.

[0002]

2. Description of the Related Art An endless track type traveling device in a construction machine such as a hydraulic excavator or a crane is disclosed, for example, in Japanese Utility Model Laid-Open No. 7-403.
The structure is as shown in JP-A-79. In other words, the endless track type traveling device is disposed on a track frame including a pair of left and right side frames in which idle wheels are disposed on one end side and drive wheels are disposed on the other end side, and is disposed on the lower surface side of each side frame. And a plurality of lower rollers, and a crawler belt wrapped around the outer periphery of each side frame.

The plurality of lower rollers are rotatably mounted by bearings at appropriate intervals on the lower surfaces of a pair of left and right side frames disposed on both sides of the track frame. The plurality of lower rollers roll while guiding the crawler belt to the side frames while receiving the weight of the entire construction machine.

[0004]

By the way, there are many types of construction machines equipped with endless track type traveling devices according to vehicle weight or bucket capacity, and new products are regularly improved and released. There are very many models that have been produced to date, including new and old models. When comparing the new model with the old model for the lower roller of the same model,
Each time a new product is released due to improvements in manufacturing costs and other reasons, the rolling diameter of the lower roller decreases, and the distance (mounting height) from the bearing mounting surface to the lower roller rolling surface decreases. The new model is not compatible with the old model.

On the other hand, since the lower roller has a role of guiding a crawler belt of a hydraulic shovel or the like and a role of taking charge of the entire weight, wear due to rotation is unavoidable. Amounts can reach usage limits.
The lower roller that has reached the use limit must be replaced with a new one. In practice, however, the lower roller and the bearing are often replaced together with a new one.

As a result, the lower roller of the old model has a larger rolling diameter of the lower roller than the lower roller of the new model, and the excess thickness of each part is large, so that the weight is heavy and the manufacturing cost is increased.

[0007] The lower roller of the old model is not a mass-produced product but a non-mass-produced product that is produced only occasionally, so that the manufacturing cost is high. Further, it is necessary to stock all the lower rollers of the new and old models, and there is a problem that management becomes extremely difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to allow a lower roller of a new model to be attached instead of a lower roller of a construction machine of an old model. Accordingly, it is an object of the present invention to provide an endless track type traveling device to which an inexpensive lower roller can be applied as a part when replacing the lower roller.

[0009]

In order to achieve the above-mentioned object, a track frame having a pair of left and right side frames having an idler wheel disposed at one end and a drive wheel disposed at the other end is provided. In an endless track type traveling device including a plurality of lower rollers disposed on a lower surface side of a frame and a crawler belt wrapped around the outer periphery of each side frame, a space between the lower surface of each side frame and the lower rollers is provided. Further, an adjusting member for adjusting the mounting position of the lower roller is interposed therebetween to adjust the mounting position of each lower roller with respect to the side frame.

[0010]

By adjusting the height between the bearing and the side frame by the adjusting member, the lower roller having a smaller diameter than the current lower roller can be replaced and mounted. In addition, by adjusting the mounting height of the lower roller by using the height adjusting member, the rolling surface of the lower roller that has worn down within the usage limit can be adjusted to the proper position.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given with reference to FIG. FIG. 1 is a side view of a hydraulic excavator provided with a tracked traveling device, and FIG. 2 shows an embodiment of the present invention.
FIG. 3 is an enlarged perspective view showing the adjusting member of FIG. 2; FIG. 4 is an enlarged side view showing a part of the endless track type traveling device of FIG. 2; 5 is a front view showing the lower roller and the bearing of FIG.

In the drawing, reference numeral 1 denotes a hydraulic excavator which is one of construction machines. The hydraulic excavator 1 is mounted on a lower traveling body 2 provided with an endless track traveling device, and is rotatably mounted on the lower traveling body 2. Upper revolving superstructure 3
A work device 4 for performing an excavation operation is provided at the front portion so as to be able to move up and down. Reference numeral 5 denotes a track frame that constitutes the lower traveling body 2. The track frame 5 includes a center frame 6 and a pair of side frames 7 disposed on both left and right sides of the center frame 6 and extending in the front-rear direction (only one is shown). ).

A sprocket 8 serving as a driving wheel is provided at one end of the side frame 7, and an idler 9 serving as an idler wheel is provided at the other end.

Reference numeral 10 denotes a traveling crawler belt that is hung between the sprocket 8 and the idler 9. 12, the lower traveling body 2 is made to travel.

Each lower roller 12 has a bearing 13 and a bolt 14 with an adjusting member 15 for adjusting a mounting position interposed on the lower surface of a lower plate 7a constituting the lower surface of each side frame 7.
Are provided. Each track roller 1 of the crawler belt 10 is formed on each of the lower rollers 12 so as to be spaced apart left and right.
0a is provided with a pair of rolling surfaces 12a that are in sliding contact with the leading end side.
b is formed integrally. And each lower roller 12
Rotates while sliding the leading end side of each track link 10a against each rolling surface 12a, and moves the crawler belt 10 to each side frame 7a.
It is to guide to.

The adjusting member 15 is made of a rectangular metal plate, and has two bolt holes 14a and 14b into which the bolts 14 are inserted. The mounting height of each lower roller 12 with respect to each side frame 7 is adjusted by the thickness C of the adjusting member 15.

In the above configuration, each lower roller 12 of a construction machine of an old type endless track type traveling device, for example, a hydraulic shovel.
When the lower roller 12 is mounted on the lower surface of the lower plate 7a of each side frame 7, when replacing the lower roller 12 with each bearing 13, each bearing 13 supporting each lower roller 12 and the lower plate 7a of each side frame 7 The height is adjusted by appropriately selecting and sandwiching the adjusting members 15 having different thicknesses between them. That is, by appropriately selecting the adjusting member 15, as shown in FIG. 5, when the mounting height H of each lower roller 12 is compared with the old model and the old model is larger, as shown in FIG. Between the mounting surface of each lower roller 12 and the lower surface of the lower plate 7a of each side frame 7,
5, the mounting height is adjusted, and the conventional excavator of the endless track type traveling device is tightened and fixed to the hydraulic excavator with the bolt 14 in the same manner as before. With this, the new and old lower rollers 1
2 compatibility can be provided.

At this time, depending on the thickness C of the adjusting member 15, the screwed length of the bolt 14 at the time of mounting may not be sufficiently obtained. In this case, it is necessary to replace the bolt 14 with a longer one.

The adjusting member 15 is, as shown in FIG.
A hole having the same size as the bolt hole diameter B and the pitch P of the bearing 13 is provided, and the thickness C is a height adjusting member having a different thickness for each model.

Also, when the rolling surface of each lower roller 12 is worn out with respect to each of the lower rollers 12 of the new and old models, the thickness C corresponding to the amount of wear is limited to the amount of wear within the use limit. The height can be adjusted by attaching the adjusting member 15.

As a result, the lower roller 12 of the new model can be mounted on the old model having a different mounting height, and it is not necessary to use the lower roller of the old model which is not a mass-produced product, so that an inexpensive lower roller can be provided.

[0022]

According to the endless track type traveling device of the present invention described above, the lower roller mounting height can be adjusted between the bearing supporting the lower roller and the lower surface of the side frame by adjusting members having different thicknesses. Since the configuration is such that the lower roller can be adjusted, the lower roller of the new model can be mounted on the endless track type traveling device of the old model, and the lower roller can be provided at low cost because it is a mass-produced product. Further, the number of lower rollers to be stocked can be reduced, which leads to a reduction in man-hours for management. In addition, the rolling surface can be adjusted to the original proper position by replacing the lower roller worn out within the usage limit.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic excavator provided with a tracked traveling device.

FIG. 2 shows an embodiment of the present invention, and is an enlarged cross-sectional view of the tracked traveling apparatus of FIG. 1 as viewed from the direction of arrows II-II.

FIG. 3 is an enlarged perspective view showing an adjustment member of FIG. 2;

FIG. 4 is an enlarged side view showing a part of the endless track traveling device of FIG. 2 in an enlarged manner.

FIG. 5 is a front view showing a lower roller and a bearing of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Undercarriage 3 Upper revolving superstructure 4 Working device 5 Track frame 6 Center frame 7 Side frame 8 Sprocket 9 Idler 10 Crawler belt 11 Upper roller 12 Lower roller 13 Bearing 14 Bolt 15 Adjusting member

Claims (2)

[Claims] 1. A track frame having a pair of left and right side frames having idle wheels disposed on one end side and driving wheels disposed on the other end side, and a plurality of lower rollers disposed on the lower surface side of each side frame. In the endless track type traveling device including a crawler belt wrapped around the outer periphery of each side frame, between the lower surface of each side frame and the plurality of lower rollers,
An endless track type traveling device, wherein an adjusting member for adjusting a mounting position of a lower roller is interposed therebetween to adjust a mounting position of each lower roller with respect to a side frame. 2. An adjusting member for adjusting a mounting position of the lower roller is interposed between a lower surface of each of the side frames and a bearing for supporting the plurality of lower rollers, and the bearing and the adjusting member are provided with a plurality of bolts. The endless track type traveling device according to claim 1, wherein the left and right side frames are attached to lower surfaces of the left and right side frames by means of a lever.