VEHICLE FRAME Russian patent published in 1995 - IPC

FIELD: automotive industry. SUBSTANCE: cross frame of vehicle is made in form of -shaped section with ends bent outside through 90 degrees and is coupled with brackets of suspension spring supports. Height of section of crossmember in its middle portion is calculated by formula where T thickness of section; [σ] - tolerable stress; L width of crossmember; R radius of crossmember curvature; P value of side load. Height h of crossmember section from its middle portion towards sidemembers changes according to the following law: h = [h2с

_р+ 0,75·P·R/t·[σ]·(cosϕ - sin ϕ +1)]^1/2 where ϕ angle. Width b of section of crossmember in its middle portion is equal to 1,47 h 1,4h_m, and width of section webs in this section is 0.37 h 0,37h_m. EFFECT: reduced metal usage by decreasing stressed state. 3 dwg