Construction machinery

Abstract

An embodiment relates to a construction machinery including a lower traveling body (200) that travels using a track. The lower traveling body includes a first side frame (210) and a second side frame(220) disposed parallel to each other and respectively equipped with the track; a center frame (250) disposed between the first side frame and the second side frame; and a driving device comprising atrack variable cylinder (350) having one side coupled to one side surface, opposing the center frame (250), of the first side frame (210), and a push rod (310) having one side slidably inserted into another side of the track variable cylinder (350) and another side passing through a side surface, opposing the center frame (250), of the second side frame (220) and coupled to the side frame inside the second frame.

Description

technical field [0001] The present invention relates to a construction machine, and more specifically, to a construction machine in which the width of a crawler belt is variable. Background technique [0002] Construction machinery generally refers to all machinery used in civil construction or building construction. Generally, a construction machine has an engine that burns fuel to supply power, and a hydraulic pump that operates using the power of the engine to discharge hydraulic fluid, and uses the hydraulic fluid discharged from the hydraulic pump to drive various working devices or travel. [0003] For example, a construction machine such as an excavator may include an upper swing body equipped with various working equipment and a cab, and an engine, a hydraulic pump, etc., and a lower traveling body that rotatably supports the upper swing body and has crawlers for traveling. In addition, the lower traveling body may include a center frame supporting the upper traveli...

AI Technical Summary

Problems solved by technology

On the contrary, when the width of the crawler of the excavator is narrow, although the working capacity is reduced, it may be easily thrown into the narrow place of the work site or the width of the access passage for entering the work site.

[0005] However, although the width of the access passage for entering the work site is narrow, a large force is required when performing work at the work site, so an excavator with a wide crawler belt is required to improve work stability.

For example, in the case of performing remodeling work to rebuild the interior of a building, a smaller width of the track is required when entering the interior of the building or moving between multiple work locations within the building, but when performing work on the job site, the track is required wider

However, in conventional excavators, the width of the crawler belt is fixed, so there is a problem that it cannot meet the requirement of changing the length of the crawler belt according to the working environment.

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