Adjustment device for a valve drive mechanism of an internal combustion engine

摘要

In a phase adjustment device for a valve drive mechanism of an internal combustion engine, in particular a camshaft adjustment device, with a phase adjustment unit which, for adjusting a phase position in a normal operating mode, comprises a coupling unit for controlling an adjustment gear element by applying a braking force, and with a failsafe adjustment arrangement for setting a defined fail-safe phase position in a fail-safe operating mode, the adjustment unit includes mechanical means for varying the braking force of the coupling unit of the phase adjustment unit for setting the phase angle to a controllable failsafe phase angle position.

主权项

1. A camshaft adjustment device for a valve drive mechanism of an internal combustion engine, having a camshaft adjustment mechanism, comprising:
an adjustment gear element (14) with a phase adjustment unit (18) for adjusting a phase position of the camshaft in a normal operating mode, a coupling unit (20) acting on the adjustment gear element (14) with a braking force, and a fail-safe adjustment arrangement (30) for setting a defined fail-safe phase position in a fail-safe operating mode, the failsafe adjustment arrangement (30) including means for continuously varying the braking force of the coupling unit (20) of the phase adjustment unit (18) depending on a momentary phase position of the camshaft for adjusting the fail-safe phase position.