公开(公告)号：US5152261A

公开(公告)日：1992-10-06

申请号：US790619

申请日：1991-11-07

Applicant: Roger P. Butterfield ,  Franklin R. Smith

Inventor： Roger P. Butterfield ,  Franklin R. Smith

IPC: F01L1/34 ,  F01L1/344 ,  F01L1/348 ,  F02B67/06

CPC classification number: F01L1/34409 ,  F01L1/348

Abstract: A driveshaft in the form of a crankshaft (12) or a camshaft (212) drives a camshaft (16, 216) by means of a chain (20, 220) which is trained around a sprocket (14, 214) on the driveshaft and another sprocket (18, 218) on the driven camshaft. The driven camshaft is selectively advanced or retarded in its position by lengthening or shortening one portion (20a, 220a) of the chain and simultaneously lengthening or shortening another portion (20b, 220b) thereof by extending one hydraulic tensioning device (22, 122, 222, 322) and simultaneously retracting another hydraulic tensioning device (24, 124, 224, 324). A spool valve member (50) is controllably positioned within a valve body (48), in response to instructions from an engine control unit (58) which acts through a pulse width modulated solenoid (56) to increase or decrease a load acting on one end of the spool, to permit or prevent hydraulic fluid from flowing from one tensioner to another as a result of a pressure differential between the tensioners. The pressure differential exists as a result of torque reversals in the driven camshaft during its normal rotation, the torque reversals having the effect of changing the levels of tension within the portions of the chain that are engaged by the tensioners.

Abstract translation: 曲轴（12）或凸轮轴（212）形式的驱动轴通过围绕驱动轴上的链轮（14,214）而被训练的链条（20,220）驱动凸轮轴（16,216），并且 在从动凸轮轴上的另一个链轮（18,218）。 被驱动的凸轮轴通过延长或缩短链条的一部分（20a，220a）而选择性地前进或延迟，同时通过延伸一个液压张紧装置（22,122,222）来延长或缩短另一部分（20b，220b） ，322）并且同时缩回另一液压张紧装置（24,124,224,324）。 响应来自发动机控制单元（58）的指令，滑阀构件（50）被可控地定位在阀体（48）内，发动机控制单元（58）通过脉宽调制螺线管（56）作用，以增加或减少作用在一个 从而允许或防止液压流体由于张紧器之间的压力差而从一个张紧器流到另一张紧器。 由于在正常旋转期间从动凸轮轴中的扭矩反转的结果，存在压力差，扭矩反转具有改变由张紧器接合的链条部分内的张力水平的效果。