Upper frame for construction machine

Abstract

The invention provides an upper frame for a construction machine which has a side deck on which a cabin is loaded, and allows the side deck to be effectively reinforced. The side deck includes a front beam, a rear beam, a left vertical beam, a right vertical beam, left and right mount holding members disposed on inner sides of left corner portion formed by the front beam and the left vertical beam and the right corner portion formed by the front beam and the right vertical beam respectively to hold cabin mounts, and a reinforcement member extending longitudinally of the side deck to be joined to an inner lateral surface of a beam to be reinforced, the beam to be reinforced selected from the left and right vertical beams. The mount holding member of the left and right mount holding members to be attached to the beam to be reinforced is a cross allowing member which has a shape avoiding the reinforcement member so as to allow the reinforcement member to extend across the mount holding member longitudinally of the side deck. A front end of the reinforcement member is directly joined to the front beam while the reinforcement member extends longitudinally across the cross allowing member.

Description

technical field [0001] The present invention relates to an upper frame of a construction machine such as a hydraulic excavator, and more particularly to an upper frame including a side platform on which a cab is mounted. Background technique [0002] by Figure 8 A hydraulic excavator is shown as an example to illustrate the background of the invention. [0003] This hydraulic excavator includes a crawler-type undercarriage 1 and a revolving upper body 2 mounted on the undercarriage 1 so as to be rotatable about an axis perpendicular to the ground. The upper slewing body 2 has an upper frame 3 constituting its base, and various equipment including a cab 4 are mounted on the upper frame 3 . In addition, a work attachment 5 is attached to the front portion of the upper frame 3 and a portion on the right side of the cab 4 , and a counterweight 6 is attached to the rear end portion of the upper frame 3 . [0004] In addition, in this specification, the position of the cab 4 is...

AI Technical Summary

Problems solved by technology

Specifically, since the assembly support member 17 is thinner than the reinforcing member 22 in plate thickness, its strength and rigidity are lower than that of the reinforcing member 22.

Therefore, in the structure in which the assembly supporting member 17 constitutes a part of the reinforcement member, the reinforcement effect on the front side is low, which may make the overall strength and rigidity of the left platform B insufficient, and may hinder the mechanical ROPS (Roll-Over Protective Struture) is the cab safety standard when dumping

Images