Patent ID: 7131407
Filing Date: 2006-11-07
Classification: F01L,F02D,F02M,Y02T

Abstract:
1. A valve operating system for an internal combustion engine comprising: a camshaft interlocked with a crankshaft; and an intake cam follower member and an exhaust cam follower member that follow an intake cam and an exhaust cam formed on the camshaft to open and close an intake valve and an exhaust valve, respectively, wherein the valve operating system further comprises: a decompression cam member that is provided on the camshaft, and moves between an operative position C where the exhaust cam follower member is operated in an opening direction of the exhaust valve in a compression stroke of the engine and an inoperative position D where the exhaust cam follower member is released; an exhaust gas recirculation cam member that is provided on the camshaft, and moves between an inoperative position F where the exhaust cam follower member is released and an operative position G where the exhaust cam follower member is operated in an opening direction of the exhaust valve in an intake stroke of the engine; and a common centrifugal mechanism that is driven by the camshaft to operate the decompression cam member to the operative position C in a starting rotation region of the engine and to the inoperative position D after the starting, and operate the exhaust gas recirculation cam member to the inoperative position F in a low speed operation region of the engine and to the operative position G in a high speed operation region.