公开(公告)号：US3981281A

公开(公告)日：1976-09-21

申请号：US588968

申请日：1975-06-20

申请人： Gerhard Deschler ,  Dieter Wittmann ,  Reinhold Trier

发明人： Gerhard Deschler ,  Dieter Wittmann ,  Reinhold Trier

IPC分类号： F01L1/08 ,  F16H53/00

CPC分类号： F01L1/08 ,  Y10T74/2101

摘要： A cam for controlling the valve of an internal combustion engine which controls the valve by means of a valve tappet having a flat bottom, against the thrust of a closing spring. The acceleration and the deceleration regions are divided into a total of five sections I-V of which the acceleration sections I and V are defined by a Fourier series of the third order represented by the equation:z.sub.J.sub." = a.sub.j.spsb.1.sup.. sin .alpha. + a.sub.j.spsb.2.sup.. sin 2.alpha.+a.sub.j.spsb.3.sup.. sin 3.alpha.in which j represents one of the respective sections I and V, while a.sub.j.spsb.1 to a.sub.j.spsb.3 are selected in conformity with the required conditions, and while .alpha. represents a function of the cam angle x. The section II which follows the opening flank and the section IV preceding the closing flank result in a precisely constant ascent of the lubrication number curve while in connection with the cam stroke to section II the following equation applies:z.sub.II = a.sup.. sin[.sqroot. 0.5( x-WPO)]-SK(x-WPO)+z.sub.A IIand while section IV is represented by the equation:z.sub.IV =a.sub.7.sup.. sin [.sqroot. 0.5( x-SKS)]+a.sub.8.sup.. cos[.sqroot. 0.5(x- SKS)]+SK(x-SKS)+z.sub.A IVthe values a and z.sub.A are obtained from the continuity of the left curve (z) and its first and second derivation z', z" according to the cam angle x. WPO represents the point of reversal with the cam lift at the opening side, whereas SK represents value of ascent, and SKS represents the start of the constant drop of the lubrication number at the closing side. In the section III, within the region of the maximum retardation a constant lubrication number is obtained which is determined by its relationship to the cam stroke or cam lift and expressed by:z.sub.III = a.sub.5.sup.. sin[.sqroot. 0.5(x-SKO)]+a.sub.6.sup.. cos [.sqroot. 0.5(x-SKO)]+Smax+RGin this equation SKOrepresents the end of the constant ascent of the cam, while Smax represents the lubrication value, and RG represents the radius of the base circle of the cam.

摘要翻译： 一种用于控制内燃机的阀的凸轮，该内燃机通过具有平底部的阀挺杆来控制阀，抵靠关闭弹簧的推力。 加速区域和减速区域被分成总共五个部分I-V，其中加速度部分I和V由以下等式表示的三阶傅里叶级数定义：