Construction machine

Abstract

An object of the present invention is to provide a construction machine in which a load acting on a vehicle body during an operation is transferred appropriately, thereby ensuring the strength of the vehicle body and improving reliability, and in which welding reliability can also be improved. In the construction machine according to the present invention, a frame of a crawler-type traveling body comprises a box-shaped center frame, a pair of truck frames disposed on the outside of opposite side portions of the center frame, and a hollow connecting member for connecting the center frame to the truck frames, in which least one of the height differences between an upper face or a lower face of the center frame at a joining portion between the center frame and the connecting member and an upper face or a lower face of a center joining portion of the connecting member is set respectively at a dimension that is approximately equal to or less than the thickness of an upper face plate or a lower face plate of the center frame.

Description

technical field [0001] The invention relates to a construction machine such as a hydraulic excavator, in particular to the structure of the frame of the lower walking body in the construction machine. Background technique [0002] In the past, hydraulic excavators 11, such as Figure 8 As shown in the side view, there is a lower walking body 12 for moving and an upper rotating body 13 rotatably assembled on its upper part. [0003] The lower running body 12 has a driving wheel 15 and a driven wheel (floating wheel) 16 respectively attached to both ends of the track frame 14 , and a crawler belt 17 is wound between the driving wheel 5 and the driven wheel 6 . [0004] The hydraulic excavator 11, by driving the engine of the power source, is converted into oil pressure by the hydraulic pump, drives the travel motor, rotates the drive wheel 15, rotates and moves the crawler belt 17, and travels. [0005] According to special wish No. 2002-332379, the framework 12F of the lower...

AI Technical Summary

Problems solved by technology

[0014] However, in the past, if Figure 9 As shown, since the cover 21 and 22 of the plate-like sheet metal processing of one plate connects the track frame 14 and the rotation box 20 to which an excessive load may be applied, the stress of the load applied to the track frame 14 is transmitted to a plate extending in the plane direction. plate covers 21, 22, so there is a problem of strength

[0015] However, in the above-mentioned structure, since the crawler frame portion to which the load is applied and the rotating box portion at the central portion are connected by an additional connecting member, there is a possibility that the connection structure between the connecting member and the rotating box portion at the central portion may be damaged. Hull damage

Images