Double independent adjustment system for independently adjusting the intake and exhaust cam lobes of a concentric camshaft assembly

摘要

A double independent CVD (DIPS) adjuster assembly (120) comprising a first and a second phaser subassembly, each comprising a rotor (122, 128) with outwardly directed wings (124, 136), a stator (128 , 142) having inwardly directed protrusions (130, 144), each of the wings (124, 136) extending between a pair of the inwardly directed protrusions (130, 144) to communicate with chambers (146, 148, 132, 134) for Defining pressurized hydraulic fluid to advance or retain the rotor (122, 128) relative to the stator (128, 142), and front and rear covers (152, 154) covering the front and rear walls of the chambers (146, 148, 132, 134), wherein the rotors (122, 128) are adapted for connection to an inner camshaft (160, 162); a valve pinion (150) or disk that is or with the stator (128, 142) of one of the phaser subassemblies, wherein the valve pinion (150) or disc is configured to transmit radial loads into the outer camshaft (162); and wherein the first and second phaser subassemblies are preassembled as a unit together, characterized in that the second phaser subassembly is radially disposed about the first phaser subassembly and wherein the wings (136) of the second phaser rotor (128) are remote from the stator (128) of the first phaser subassembly extend outwards first adjuster substructure.