Patent ID: 7328674
Filing Date: 2008-02-12
Classification: F01B,F01L,F02B,F02D,F02F,F02G,Y02T

Abstract:
1. A rotary valve system for controlling communication with a port in an internal combustion engine, comprising: an outer valve member which is rotatively mounted in a bore and has an opening which moves into and out of communication with the port as the outer valve member rotates, an inner valve member rotatably mounted within the outer valve member with an opening at least partly overlapping the opening in the outer valve member, an endless drive element trained about a drive wheel and a wheel connected to one of the valve members with runs of the drive element between the wheels on opposite sides of the wheel connected to the one valve member, and means for differentially varying the relative lengths of the runs to advance and retard the one valve member relative to the drive wheel to change the degree of overlap between the openings and thereby control the timing and duration of communication between the openings and the port.