Patent ID: 7325520
Filing Date: 2008-02-05
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, a first drive gear affixed to the inner valve member, a second drive gear affixed to the outer valve member, and a variable gear train interconnecting the drive gears for rotation in unison while permitting the drive gears to be advanced and retarded relative to each other to change the degree of overlap between the openings and thereby control the timing and duration of communication between the openings and the port.