METHOD INCREASING DURABILITY OF PARTS OF MOVABLE JOINTS OF MECHANISMS IN MACHINES Russian patent published in 1998 - IPC

FIELD: mechanical engineering. SUBSTANCE: method involves determination of length b and radius r of one of parts of joint before "shaft-bushing" joint is set in motion and in calculation of wear coefficient K of part from dependence K = I/P_av.pr.,, where P_av.pr. is average pressure in joint per cycle equal to 2Q_av.r./πbr,, where Q_av.r. is arithmetic mean of reaction force in joint per cycle; J is intensity of wear-out and cycle is time of one revolution of shaft. Before determination of distribution of wear-out of friction surface this surface of part is divided into i sections and wear-out is found in points on boundary of each section from dependence , where dϕ₁ is increment of turning angle of shaft of machine; N_c is specified calculated number of loading cycles; V_ck= V₁-V₂ are absolute linear velocity in point of contact; α is angular coordinate of point lying on friction surface of part in system of coordinates couped to joint. Summary wear-out U_sum of friction surface is defined as sum of wear-outs in points on boundary of each section, average wear-out Uavi,i+1

is found from dependence , average summary wear-out Uavsum is found from dependence Uavsum= and wear coefficient K_i in each section is obtained from dependence by which distribution of wear-out is evaluated. Deposition of coat is carried out depending on value K_i. Sections having greater K_i are deposited with more wear resistant coat. Then all these operations are repeated for another member of joint. EFFECT: increased durability of parts of movable joints. 2 cl, 12 dwg , 1 tbl