Patent ID: 10619524

Abstract:
A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having at least one recess for receiving the at least one vane of the rotor, wherein the at least one vane divides the at least one recess into a first chamber and a second chamber; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a cam torque actuation control valve comprising a valve body and a hydraulic shuttle element. The HSE shuttles between two positions in response to overpressure in the first or second chamber, which prevents flow between the chambers. Deploying a blocking device blocks the HSE from attaining one of the two positions, thereby allowing unidirectional flow between the two chambers. By timing the deployment of the blocking device, the direction of flow can be controlled.