Camshaft phaser bias spring mechanism
AssigneeDelphi Technologies, Inc.
InventorsPaul A. Armour, Natalie G. Payne, Dominic Borraccia
Life of this patent
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Abstract
In a prior art camshaft phaser having a biasing spring, the stator spring tang is anchored to a first binder screw passing through a stator lobe adjacent the locking pin-containing vane of the rotor, and the rotor spring tang is anchored to a first target wheel protrusion opposite such a vane. In an improved installation method in accordance with the invention, during assembly of an improved phaser the biasing spring is rotated about 180° from the prior art position such that the stator spring tang is anchored to a first fixed stop generally opposite the pin-containing vane, and the rotor spring tang is anchored to a second fixed stop generally adjacent such a vane.
Claims19
A vane-type camshaft phaser for varying the timing of combustion valves in an internal combustion engine, comprising:
- a stator having a plurality of angularly spaced-apart lobes extending inwards defining a cavity therewithin;
- a rotor disposed within said stator cavity and having a plurality of vanes equal in number to the number of said plurality of lobes extending outwards of a rotor hub, said vanes being interspersed with said stator lobes to define a plurality of alternating rotor-advancing and rotor-retarding chambers, one of said plurality of rotor vanes being larger than any of the other rotor vanes;
- a first fixed stop associated with said rotor and being aligned with one of said plurality of stator lobes adjacent said larger rotor vane;
- a second fixed stop associated with said stator and being generally diametrically opposed to said first fixed stop;
- a coiled spring having a first tang and a second tang, wherein said first tang is axially spaced apart from said second tang, wherein said first tang is grounded to said first fixed stop, and wherein said second tang is grounded to said second fixed stop.
A vane-type camshaft phaser for varying the timing of combustion valves in an internal combustion engine, comprising:
- a drive wheel having a sealing hub;
- a stator disposed on said sealing hub and having a plurality of angularly spaced-apart lobes extending inwards defining a cavity therewithin;
- a rotor disposed within said stator cavity and having a plurality of vanes equal in number to the number of said plurality of lobes extending outwards of a rotor hub, said vanes being interspersed with said stator lobes to define a plurality of alternating rotor-advancing and rotor-retarding chambers, one of said plurality of rotor vanes being larger than any of the other rotor vanes, each of the vanes having a surface associated with said sealing hub;
- a coiled spring having a first tang and a second tang, wherein said first tang is axially spaced apart from said second tang;
- and
- means for grounding said spring to said stator and said rotor to prevent oil leakage across said surface of said large vane and said sealing hub.
A method for installing a rotor-biasing spring into a vane-type camshaft phaser, the camshaft phaser including a stator and a rotor, the stator having a plurality of angularly spaced-apart lobes extending inwards defining a cavity therewithin, the rotor being disposed within the stator cavity and having a plurality of vanes equal in number to the number of the plurality of lobes extending outwards of a rotor hub, the vanes being interspersed with the stator lobes to define a plurality of alternating rotor-advancing and rotor-retarding chambers, one of the plurality of the rotor vanes being larger than any of the other rotor vanes, the spring having a first tang axially spaced apart from a second tang, the method comprising:
- providing a first fixed stop associated with the rotor and positioned generally adjacent the larger rotor vane;
- providing a second fixed stop associated with the stator and positioned generally diametrically opposed to said first fixed stop;
- grounding the first tang against one of the first or second fixed stops;
- and
- grounding the second tang against the other of the first or second fixed stops.
Dependencies are inferred from the claim text.