US 7,610,882 B2 · Default device of actuator for variable lift valve operating mechanism

Abstract

In a default device of an actuator for a variable lift valve operating mechanism, in the event of failure of the actuator, a pressed portion of a lever pivotably supported on a support shaft is urged by a resilient force of a coil spring, an arm is pressed by a cam portion of the lever to rotate a control shaft in one direction to prevent valve lift from being a predetermined value or lower. The support shaft that pivotably supports the lever of a default mechanism is placed in a position offset from a rotation axis of the control shaft. Thus, as compared with the case where the support shaft is placed coaxially with the control shaft, a large urging force is input from the lever to the control shaft to reliably prevent the valve lift from being the predetermined value or lower.

Claims19

Dependent claims

A default device of an actuator for a variable lift valve operating mechanism in which in the event of failure of an actuator that rotatably drives a control shaft of a variable lift valve operating mechanism capable of varying valve lift of an engine valve of an internal combustion engine, the control shaft is urged in one direction by an urging member of a default mechanism to prevent the valve lift from being a predetermined value or lower or higher,

wherein a support shaft that pivotably supports the urging member is offset from a rotation axis of the control shaft, and
wherein the urging member is a lever pivotably supported at an intermediate portion thereof by the support shaft, and one end of the lever is urged by a spring and the other end thereof abuts a driven portion of the control shaft.

Dependencies are inferred from the claim text.

Default device of actuator for variable lift valve operating mechanism

Life of this patent

Default device of actuator for variable lift valve operating mechanism

Life of this patent

Abstract

Claims19