Timing Phaser With Offset Spool Valve
AssigneeBorgWarner Inc.
InventorsFranklin R. Smith, Peter Chapman
Life of this patent
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Abstract
A variable cam timing phaser for an internal combustion engine with at least one camshaft includes a housing (144), a rotor (138), and a phaser control valve (168). The phase control valve is offset from a center axis of rotation through the camshaft of the phaser and may also be parallel to the center axis of rotation. The phaser control valve directs fluid flow to shift the relative angular position of the rotor relative to the housing. The phaser may be cam torque actuated, oil pressure actuated, or torsion assist.
Claims15
A variable cam timing phaser for an internal combustion engine with at least one camshaft comprising:
- a housing with an outer circumference for accepting a drive force;
- a rotor for connection to a camshaft coaxially located within the housing having at least one vane defining a chamber between the housing and the rotor, the at least one vane separating the chamber into an advance chamber and a retard chamber, the at least one vane being capable of rotation to shift relative angular position of the housing and the rotor;
- and
- a phase control valve offset from a center axis of rotation through the camshaft of the phaser, for directing fluid flow to shift the relative angular position of the rotor relative to the housing.
Dependencies are inferred from the claim text.