| 摘要 |
<p>The invention relates to an actuating unit for an electromechanically actuated disc brake for motor vehicles. Said actuating unit substantially comprises a drive unit (1) or an electromotor (10), an actuating element (7) which is used to engage one (4) of two friction linings (4, 5) which are displaceably mounted in a brake caliper, with a brake-disc (6) and a reduction gear (2). A freewheel mechanism (35) which co-operates with the electromotor (10) acts as a parking brake. In order to guarantee a high level of operational reliability for the parking brake and to make said parking brake resistant to external influences, in particular, oscillations or vibrations, the invention is characterised in that the freewheel mechanism (35) is configured in such a way, that its clamping action is produced by a positive-fit torque transfer and that, in its actuated state, it prevents a rotational movement of a bearing (24), in which the rotor (11) of the electromotor (10) is mounted.</p> |
