switchable tappet for intake/exhaust valve of internal combustion engines and operating system thereof

摘要

The present invention short-stroke cam and the long stroke cam through a change to the overall shape of a switchable tappet which is provided so as to occupy the same width in that, the cylinder head on the intake / exhaust valve switchable tappet and its driving apparatus of an internal combustion engine by expanding the contact area for each of the low-engine, medium and high speed when maximizing a valve lift of each intake / exhaust valves it is an object to make possible to improve the output of the engine.; In order to achieve the above object the present invention, which is arranged in the center in a rectangular shape in contact with the short-stroke cam (22a) Low lift the contact member (36) and; The low lift contact member 36 are arranged in both sides of the high lift rectangular contact piece 38 on the cam in contact with the long stroke (22b) of and; In addition soon as communication with the upper hydraulic pressure line (16a) disposed to the upper side of the cylinder head 14, respectively, provided in the low lift the contact member 36 and the high lift contact member 38, it entered into the first of mutual constraint between these equipped with a mechanism (30a); In addition soon as communication with the lower side of the lower oil pressure line (16b) arranged in the cylinder head 14, inside the second connection mechanism (30b) to said mediated high lift contact member 38 provided in the cylinder head 14, It characterized by being configured to only restraint.