METHOD FOR ACTUATING A BLOCKING TAPPET, ACTUATION UNIT AND VEHICLE BRAKE

1 . A method for actuating a blocking slide ( 40 ) which is actuatable by means of an electromagnet ( 45 ) and which, in at least one position, engages into a structured surface, whereby the blocking slide ( 40 ) prevents a rotation of the structured surface ( 37 ) in at least one direction of rotation,

wherein the method comprises the following steps:

moving the structured surface ( 37 ) into a specified orientation, and then

applying a supply voltage to the electromagnet ( 45 ) such that the blocking slide ( 40 ) engages with the structured surface ( 37 ) whilst the structured surface ( 37 ) remains in the specified orientation.

2 . The method as claimed in claim 1 ,

wherein the structured surface ( 37 ) is formed on a shaft ( 30 ) or on a ratchet wheel ( 35 ) that is connected rotationally conjointly to the shaft ( 30 ).

3 . The method as claimed in any one of the preceding claims ,

wherein the orientation is a specified angular position or lies within a specified range of angular positions.

4 . The method as claimed in any one of the preceding claims ,

wherein the orientation of the structured surface ( 37 ) or of the shaft ( 30 ) is monitored by means of an angular position sensor ( 25 ).

5 . The method as claimed in claim 4 ,

wherein the angular position sensor ( 25 ) defines multiple segments within which it can distinguish angular positions, wherein the angular position sensor ( 25 ) cannot distinguish the segments from one another.

6 . The method as claimed in claim 5 ,

wherein the structured surface ( 37 ) has, along a circumference, a number of teeth and/or recesses that is equal to the number of segments multiplied by a natural number.

7 . The method as claimed in claim 2 or any claim dependent thereon,

wherein, for calibration, the shaft ( 30 ) is rotated, whilst the blocking slide ( 40 ) is in engagement, in the blocked direction as far as a stop, and

the angular position sensor ( 25 ) is calibrated on the basis of said stop.

8 . The method as claimed in any one of the preceding claims ,

wherein, during the orientation, the blocking slide ( 40 ) engages into a recess of the structured surface ( 37 ).

9 . The method as claimed in any one of the preceding claims ,

wherein the blocking slide ( 40 ), when engaged, prevents a rotation only in one direction of rotation.

10 . The method as claimed in any one of the preceding claims ,

wherein the structured surface ( 37 ), before a release of the blocking slide ( 40 ), is moved into a release orientation, and

the blocking slide ( 40 ) is moved out of engagement whilst the structured surface ( 37 ) remains in the release orientation.

11 . An actuating unit ( 10 ) for a vehicle brake, comprising

an electromagnet ( 45 ),

a shaft ( 30 ) having a structured surface ( 37 ),

a blocking slide ( 40 ) which is actuatable by means of the electromagnet ( 45 ) and which, in at least one position, engages into the structured surface ( 37 ), wherein the blocking slide ( 40 ) prevents a rotation of the structured surface ( 37 ) in at least one direction of rotation, and

a control device ( 50 ) that is configured to execute a method as claimed in any one of the preceding claims .

12 . The actuating unit ( 10 ) as claimed in claim 11 ,

which furthermore comprises an electric motor ( 20 ) for driving the shaft ( 30 ).

13 . The actuating unit ( 10 ) as claimed in either one of claims 11 and 12 ,

which comprises an angular position sensor ( 25 ) for detecting an orientation of the shaft ( 30 ).

14 . The actuating unit ( 10 ) as claimed in claim 12 and claim 13 ,

wherein the angular position sensor ( 25 ) is a motor angle sensor of the electric motor ( 20 ).

15 . A vehicle brake ( 5 ), comprising

at least one brake shoe ( 7 ), and

at least one actuating unit ( 10 ) as claimed in any one of claims 11 to 14 ,

wherein the shaft ( 30 ) is designed to actuate the brake shoe ( 7 ).