Patent ID: 9610985
Date: 2017-04-04
CPC Classifications: B62D,E02F

Claim:
1. A truck frame for a hydraulic excavator and which is configured to be divided for transport to a working site, comprising: a center frame of a lower traveling structure on a central part of which a support cylindrical body is disposed which rotatably supports an upper revolving structure, and that includes front legs and rear legs disposed at both sides in left-right directions thereof; and left and right side frames of said lower traveling structure that are respectively positioned at left and right sides of said center frame and extending in front-rear directions, and are respectively mounted to ends of said front legs and said rear legs, wherein said center frame further comprises: an upper plate on an upper surface side of which said support cylindrical body is disposed, and at both sides in the left-right directions of which upper front leg portions and upper rear leg portions are disposed; a lower plate that is disposed to face said upper plate in upper-lower directions and at both sides in the left-right directions of which lower front leg portions and lower rear leg portions are disposed; a front plate that closes a front side position between said upper plate and said lower plate; a rear plate that closes a rear side position between said upper plate and said lower plate; and left and right side plates that respectively close left and right side positions between said upper plate and said lower plate, wherein each of said left and right side frames comprises: an inner surface plate disposed at one of the sides of said center frame; an outer surface plate disposed to face said inner surface plate and to be spaced therefrom; and an upper surface plate that connects an upper end of said inner surface plate and an upper end of said outer surface plate, wherein said center frame further comprises: front flanges protruding in the front-rear directions from said lower front leg portions and rear flanges protruding in the front-rear directions from said lower rear leg portions; and front bolt through holes that penetrate said front flanges in the upper-lower directions and rear bolt through holes that penetrate said rear flanges in the upper-lower directions, wherein each of said left and right side frames further comprises: a front leg mounting member having a front mounting plate that protrudes from said inner surface plate thereof toward said center frame to be mounted to one of said front flanges and a front reinforcing plate fixed to a lower surface of said front mounting plate and said inner surface plate thereof to reinforce said front mounting plate; a rear leg mounting member having a rear mounting plate that protrudes from said inner surface plate thereof toward said center frame to be mounted to one of said rear flanges and a rear reinforcing plate fixed to a lower surface of said rear mounting plate and said inner surface plate thereof to reinforce said rear mounting plate; and a plurality of female bolt holes provided on said front mounting plate and said rear mounting plate respectively and disposed in positions corresponding to said front bolt through holes and said rear bolt through holes, wherein each of said front mounting plate and said rear mounting plate has a base end side that is respectively welded to said inner surface plate of one of said left and right side frames and a front end side that is a flat plate extending horizontally so as to protrude toward said center frame, wherein each of said front reinforcing plate and said rear reinforcing plate is a flat plate respectively extending perpendicular to the lower surface of said front mounting plate and said rear mounting plate, and wherein, in a state where said front and rear flanges of said center frame are placed respectively on said front mounting plate and said rear mounting plate of said front and rear leg mounting members of said left and right side frames, said front bolt through holes, said rear bolt through holes and said female bolt holes are positioned to accept bolts inserted therein to mount said left and right side frames to said center frame to assemble said lower traveling structure at said working site.