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US 12,392,265 B2Granted
Hydraulic variable camshaft timing with a temperature based hydraulic switch
AssigneeBorgWarner Inc.
InventorsAdam Bruce, Keith Feldt, Braman Wing
Life of this patent
Estimating the term…
Abstract
A hydraulic variable camshaft timing (VCT) assembly including a stator having at least one fluid chamber; and a rotor, received by and angularly displaceable relative to the stator, having at least one vane positioned within the fluid chamber extending radially outwardly from a hub, and a hydraulic switch assembly positioned in the rotor to regulate a flow of fluid between an advancing chamber and a retarding chamber through the vane.
Claims13
A hydraulic variable camshaft timing (VCT) assembly, comprising:
- a stator having at least one fluid chamber;
- and
- a rotor, received by and angularly displaceable relative to the stator, having at least one vane positioned within the at least one fluid chamber extending radially outwardly from a hub, and a contorted fluid path positioned in the rotor to regulate a flow of fluid between an advancing chamber and a retarding chamber, further comprising a chamber logic valve that controls a flow of fluid to the advancing chamber or the retarding chamber based on a rate of fluid flow through the contorted fluid path and a short logic valve that controls a flow of fluid through a shorting fluid path, wherein the contorted fluid path selectively impedes the flow of fluid through the contorted fluid path depending on temperature.
A hydraulic variable camshaft timing (VCT) assembly, comprising:
- a stator having at least one fluid chamber;
- a rotor, received by and angularly displaceable relative to the stator, having at least one vane positioned within the at least one fluid chamber extending radially outwardly from a hub, and a contorted fluid path positioned in the rotor further comprising a dual logic valve that controls a flow of fluid through a shorting fluid path between advancing and retarding chambers based on a rate of fluid flow through the contorted fluid path as well as a flow of fluid from a control valve to either the advancing chamber or retarding chamber to prevent a flow of fluid between the advancing chamber and the retarding chamber at or below a predetermined temperature and permit the flow of fluid between the advancing chamber and the retarding chamber above the predetermined temperature.
Dependencies are inferred from the claim text.