Electro-mechanical torque control-elimination of stopping noise

A method of controlling an electro-mechanical axial setting device wherein the axial setting device comprises:

• two setting rings (23, 26) centered on a common axis, one of which is axially held, with the other one being axially displaceably mounted, and one of which is rotationally fixedly held in a housing, with the other one being rotatingly drivable,
• the two setting rings (23, 26), on their respective end faces facing one another, each comprise an identical plurality of circumferentially extending grooves (41, 44),
• the grooves (41, 44), in a plan view of the end faces, comprise depths which rise in the same circumferential direction and form pairs of grooves (41,44) in the two setting rings (23,26) each pair accommodating a ball (29),
• wherein the rotatingly drivable setting ring (23) is connected to an electric motor (11), and the axially displaceable setting ring (26) is loaded by pressure springs towards the axially held setting ring (23),
• the method comprising:
• applying a positive voltage to the electric motor (11) to move the axial setting device into an advanced position;
• disconnecting the positive voltage from the electric motor (11) to return the axial setting device into a starting position;
• and
• during the return motion, shortly before the starting position is reached, applying a positive voltage to the electric motor (11) to generate a braking moment.

An electro-mechanical axial setting device comprising:

• two setting rings (23, 26) centered on a common axis, one of which is axially held, with the other one being axially displaceably mounted, and one of which is rotationally fixedly held in a housing, with the other one being rotatingly drivable.
• the two setting rings (23, 26), on their respective end faces facing one another, each comprise an identical plurality of circumferentially extending grooves (41, 44),
• the grooves (41, 44), in a plan view of the end faces, comprise depths which rise in the same circumferential direction, and form pairs of grooves (41, 44) in the two setting rings (23,26) each pair accommodating a ball (29),
• wherein the rotatingly drivable setting ring (23) is connected to an electric motor (11), and the axially displaceable setting ring (26) is loaded by pressure springs towards the axially held setting ring (23), and
• a rotational position sensor arranged at a rotating part of the axial setting device for controlling a short circuit switching assembly for the electric motor, and
• a control mechanism for applying a positive voltage to the electric motor (11) to move the axial setting device into an advanced position, disconnecting the positive voltage from the electric motor (11) to return the axial setting device into a starting position and, during the return motion, shortly before the starting position is reached, short-circuiting the electric motor (11) to generate a braking moment.

An electro-mechanical axial setting device comprising:

• two setting rings (23, 26) centered on a common axis, one of which is axially held, with the other one being axially displaceably mounted, and one of which is rotationally fixedly held in a housing, with the other one being rotatingly drivable,
• the two setting rings (23, 26), on their respective end faces facing one another, each comprise an identical plurality of circumferentially extending grooves (41, 44),
• the grooves (41, 44), in a plan view of the end faces, comprise depths which rise in the same circumferential direction, and form pairs of grooves (41, 44) in the two setting rings (23,26) each pair accommodating a ball (29),
• wherein the rotatingly drivable setting ring (23) is connected to an electric motor (11), and the axially displaceable setting ring (26) is loaded by pressure springs towards the axially held setting ring (23), and
• a rotational position sensor arranged at one of the rotating parts of the axial setting device for controlling a voltage connection for the electric motor, and
• a control mechanism for applying a positive voltage to the electric motor (11) to move the axial setting device into an advanced position, disconnecting the positive voltage from the electric motor (11) to return the axial setting device into a starting position and, during the return motion, shortly before the starting position is reached, applying a positive voltage to the electric motor (11) to generate a braking moment.