Hydraulically biased camshaft phaser
AssigneeDelphi Technologies IP Limited
InventorThomas Howard Lichti
Life of this patent
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Abstract
A camshaft phaser includes a stator having a plurality of lobes; a rotor coaxially disposed within the stator, the rotor having a plurality of vanes interspersed with the plurality of lobes defining a plurality of advance chambers and a plurality of retard chambers such that the plurality of advance chambers and the plurality of retard chambers are arranged in an alternating pattern and such that the rotor rotates within the stator from a full advance position to a full retard position; and a supply passage in continuous fluid communication with one of the plurality of advance chambers, the supply passage being in continuous fluid communication with an oil source.
Claims17
A camshaft phaser for use with an internal combustion engine for controllably varying a phase relationship between a crankshaft and a camshaft in said internal combustion engine, said camshaft phaser comprising:
- a stator having a plurality of lobes, the stator being configured to connect to said crankshaft of said internal combustion engine so as to provide a fixed ratio of rotation between said stator and said crankshaft;
- a rotor coaxially disposed within said stator, said rotor having a plurality of vanes interspersed with said plurality of lobes defining a plurality of advance chambers and a plurality of retard chambers such that said plurality of advance chambers and said plurality of retard chambers are arranged in an alternating pattern and such that said rotor rotates within said stator from a full advance position to a full retard position;
- and
- a supply passage in continuous fluid communication with one of said plurality of advance chambers, said supply passage being in continuous fluid communication with an oil source such that said one of said plurality of advance chambers is in fluid communication with said oil source so as to pressurize said one of said plurality of advance chambers when another one of said plurality of advance chambers is vented so as to prevent pressurization of said another one of said plurality of advance chambers.
A method of using a camshaft phaser for use with an internal combustion engine for controllably varying a phase relationship between a crankshaft and a camshaft in said internal combustion engine, said camshaft phaser comprising a stator having a plurality of lobes, the stator being configured to connect to said crankshaft of said internal combustion engine so as to provide a fixed ratio of rotation between said stator and said crankshaft;
- a rotor coaxially disposed within said stator, said rotor having a plurality of vanes interspersed with said plurality of lobes defining a plurality of advance chambers and a plurality of retard chambers such that said plurality of advance chambers and said plurality of retard chambers are arranged in an alternating pattern and such that said rotor rotates within said stator from a full advance position to a full retard position;
- and a supply passage, said method comprising:
- using said supply passage to provide continuous fluid communication between one of said plurality of advance chambers and an oil source such that said one of said plurality of advance chambers is in fluid communication with said oil source so as to pressurize said one of said plurality of advance chambers when another one of said plurality of advance chambers is vented so as to prevent pressurization of said another one of said plurality of advance chambers.
A camshaft phaser for use with an internal combustion engine for controllably varying a phase relationship between a crankshaft and a camshaft in said internal combustion engine, said camshaft phaser comprising:
- a stator having a plurality of lobes, the stator being configured to connect to said crankshaft of said internal combustion engine so as to provide a fixed ratio of rotation between said stator and said crankshaft;
- a rotor coaxially disposed within said stator, said rotor having a plurality of vanes interspersed with said plurality of lobes defining a plurality of advance chambers and a plurality of retard chambers such that said plurality of advance chambers and said plurality of retard chambers are arranged in an alternating pattern and such that said rotor rotates within said stator from a full advance position to a full retard position;
- and
- wherein one of said plurality of advance chambers is configured to be in continuous fluid communication with an oil source so as to pressurize said one of said plurality of advance chambers when another one of said plurality of advance chambers is vented so as to prevent pressurization of said another one of said plurality of advance chambers.
Dependencies are inferred from the claim text.