CAM OF VALVE TIMING GEAR OF INTERNAL COMBUSTION ENGINE Russian patent published in 2001 - IPC

FIELD: mechanical engineering; internal combustion engines; valve timing gears. SUBSTANCE: purpose of invention is to provide optimum geometric, kinematic and dynamic parameters of cam mechanism by direct setting of shape of cam in analytic form using simple functions, in particular, polynomials. Shape of cam surface is made in form of rising curve of flat tappet containing at least four sections, each described by equation where h_i is height of lift of flat tappet on i-th section; Φ is current value of cam turning angle; a_0i...a_in are coefficients found from boundary conditions. To obtain optimum parameters of cam mechanism over entire working range, number of sections and number of terms of polynomial describing the rise of flat tappet on each of them are within the limits of . Main sphere of application passenger cars. EFFECT: enhanced operation reliability. 4 cl