Valve train for internal combustion engine
AssigneeHonda Motor Co., Ltd.
InventorMasahiko TASHIRO
Life of this patent
Estimating the term…
Abstract
A valve train includes a primary rocker arm 50 oscillating about a primary oscillating center line L4 in response to the rotation of an inlet cam 21, a secondary rocker arm 60 oscillating about a secondary oscillating center line L5 so as to transmit a valve drive force via the primary rocker arm 50 to the inlet valve 14 and a holder 30 which supports the primary and secondary rocker arms 50, 60 in an oscillatory fashion in such a manner that the primary and secondary oscillating center lines L4, L5 oscillate together. A cam profile 55 has a lost motion profile 55a a drive profile 55b are formed on an abutment portion 54 of the primary rocker arm 50. A sectional shape of the lost motion profile 55a is an arc-like shape which is formed about the primary oscillating center line L4.
Claims4
A valve train for an internal combustion engine, comprising:
- a valve operating cam rotating around a rotational center line in synchronism with a rotation of an engine;
- an engine valve including at least one of an inlet valve and an exhaust valve;
- a transmission mechanism which transmits a valve drive force of the valve operating cam to the engine valve so as to operate the engine valve in open and close states, and comprises:
- a oscillating member which oscillates about a main oscillating center line in accordance with a rotation of the valve operating cam and transmits the valve driving force to the engine valve;
- and
- a holder oscillatably supporting the oscillating member and comprising:
- a pair of side walls on which fulcrum portions oscillatably supporting the holder on a cylinder head of the internal combustion engine are provided;
- and
- a connecting wall which connects the pair of the side walls each other;
- and
- a driving mechanism which applies the driving force to an operation portion provided on the connection wall of the holder to thereby oscillate the holder about the holder oscillating center line so as to control valve properties including opening and closing timings and maximum lift amount of the engine valve in accordance with a position of the holder, wherein
- the holder is oscillated around the holder oscillating center line which differs from the rotation center line of the valve operating cam, and
- the main oscillating center line oscillates together with the holder.
Dependencies are inferred from the claim text.