Valve train for internal combustion engine

Details Valve train for internal combustion engine Valve train for internal combustion engine

F - Mech Eng,Light,Heat,Weapons

01

L

F01L 13/00 (2006.01)

Patent

CA 2556507

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 and a drive profile 55b 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.

Une commande de soupape comprend un bras poussoir primaire (50) oscillant autour d~une ligne primaire centrale d~oscillation (L4) en réaction à la rotation d~une came d~admission (21), un bras poussoir secondaire (60) oscillant autour d~une ligne secondaire centrale d~oscillation (L5) de façon à transmettre une force d~entraînement de soupape au travers du bras poussoir primaire (50) à la soupape d~admission (14) et un maintien (30) qui supporte les bras poussoirs, primaire et secondaire, (50, 60) de façon oscillante de manière telle que les lignes, primaire et secondaire, centrales d~oscillation (L4, L5) oscillent ensemble. Un profil de came (55) possède un profil mort (55a), un profil d~entraînement (55b) qui sont formés sur une partie d~appui (54) du bras poussoir primaire (50). Une forme de section du profil mort (55a) est de type « arc », formé autour de la ligne primaire centrale d~oscillation (L4).

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