Electromechanical braking device for a motor vehicle and method of operating an electromechanical braking device

An electromechanical braking device for a motor vehicle, comprising:

• an actuating device;
• and
• a brake part connected to the actuating device;
• wherein the brake part is adjustable along an axis by the actuating device and can be brought into braking engagement with a counter-braking part;
• wherein the actuating device has a first actuating drive and a second actuating drive coupled in series with the first actuating drive;
• wherein the first actuating drive has a rotationally drivable first drive wheel and the second actuating drive has a rotationally drivable second drive wheel, which is coaxial to the first drive wheel;
• wherein a clutch device is arranged between the first drive wheel and the second drive wheel;
• wherein the clutch device is designed as a friction clutch with a friction element, which is frictionally connectable to a counter-friction element during the engagement of the clutch.

A method for operating an electromechanical braking device which has an actuating device, comprising a first actuating drive and a second actuating drive coupled in series to the first actuating drive, and which actuating device acts on a brake part, which can be brought into braking engagement with a counter-brake part in the direction of an axis, wherein the first actuating drive has a rotationally drivable first drive wheel, to which a first driving torque can be applied for actuation, and the second actuating drive has a rotationally drivable second drive wheel, which is coaxial to the first drive wheel and to which a second driving torque can be applied for the actuation, wherein a clutch device is arranged between the first drive wheel and the second drive wheel, wherein the clutch device is designed as a friction clutch and has a predeterminable clutch torque, in the event of the exceeding of which the first drive wheel slips slidingly relative to the second drive wheel, the method comprising:

• driving the first drive wheel and the second drive wheel synchronously, thereby actuating the first actuating drive while the second actuating drive remains unactuated;
• and
• driving the second drive wheel and stopping the first drive wheel relative to the second drive wheel such that the friction clutch slips, thereby actuating the second actuating drive while the first actuating drive remains unactuated.