Patent ID: 11946395
Assignee: BORGWARNER INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 19:
20. A variable cam timing phaser of a variable cam timing system including a camshaft, said variable cam timing phaser comprising:
a housing disposed about an axis and having an inner housing surface defining a housing interior;
a rotor at least partially disposed within said housing interior and moveable with respect to said housing between an advance position and a retard position different from said advance position, wherein said rotor comprises a hub and a vane extending from said hub away from said axis toward said inner housing surface, with said rotor and said housing defining a chamber that is fillable with hydraulic fluid for rotating said rotor about said axis with respect to said housing between said advance and retard positions, and with said vane being disposed in said chamber and further defining said chamber into an advance chamber and a retard chamber;
a control valve assembly, comprising,
a valve housing defining a valve housing interior, and
a control piston disposed in said valve housing interior and between at least a first and second position with respect to said valve housing to control a flow of hydraulic fluid through said valve housing interior; and

a chamber biasing assembly disposed in one of said advance and said retard chambers and configured to bias said rotor into a predetermined position between said advance and said retard positions;
wherein said chamber biasing assembly comprises a chamber piston, a chamber biasing member, and a chamber check valve; and
wherein said valve housing is disposed outside of said rotor.