Variable cylinder device for internal combustion engines

Claim 1

A variable cylinder device for an internal combustion engine, comprising: a valve lift mechanism having a rocker arm which rocks around a rocker shaft and causes an intake or exhaust valve to operate in response to a rotary movement of a camshaft; an oil-supplying type lash adjuster fixed to a housing at its upper portion and fitted to a rocker support at its lower end portion, said rocker shaft being fixed to said rocker support; a mechanism for shifting the rocking fulcrum of said rocker arm so that the rocker arm rocks around its one end which is in contact with the upper end of a valve stem of said intake or exhaust valve, causing said rocker support to be movable up-and-down with the rocker shaft, thereby maintaining a closed position of said intake or exhaust valve; said rocker support having a pipe protruding upwards and slidably inserted into a longitudinal hole formed in said housing and a lubrication oil passage which connects said pipe with a sliding surface between said rocking shaft and said rocker arm; said housing having a main oil passage for supplying oil to said lash adjuster and a lubrication oil passage which connects said main oil passage with said longitudinal hole in the housing; and said sliding surface between the rocking shaft and the rocker arm being supplied with lubrication oil from said main oil passage through said lubrication oil passage in said housing, said pipe protruding from the rocker support and said lubrication oil passage in said rocker support.