Electromotive furniture drive comprising a drive motor with a brake device
The invention relates to an electromotive furniture drive comprising a drive motor ( 10 ). The drive motor ( 10 ) has a driveshaft ( 11 ) which is mechanically coupled to a brake device ( 13 ), and the brake device ( 13 ) has a looping wrap spring ( 15 ). The electromotive furniture drive is characterized in that the brake device ( 13 ) comprises a brake element ( 17 ) which is designed to apply a braking torque to the drive shaft ( 11 ) in a rotational direction. The brake element ( 17 ) is operatively connected to a coupling element ( 16 ) in a mechanical manner, and the wrap spring ( 15 ) is positioned on an outer lateral surface ( 161 ) of the coupling element ( 16 ).
1. An electromotive furniture drive, comprising:
a brake device including a looping wrap spring;
a drive motor including a drive shaft which is mechanically coupled to the brake device, said brake device including a brake element configured to apply a braking torque to the drive shaft in one direction of rotation;
a coupling element in mechanical operative connection with the brake element, said looping wrap spring being placed on an outer jacket surface of the coupling element; and
an axial bearing arranged centrally on the coupling element.
2. The electromotive furniture drive of claim 1 , wherein the brake element and the coupling element are connected to one another by a positive-locking connection.
3. The electromotive furniture drive of claim 1 , wherein the brake element and the coupling element are connected to one another with play.
4. The electromotive furniture drive of claim 1 , further comprising a claw coupling to connect the brake element and the coupling element to one another.
5. The electromotive furniture drive of claim 4 , wherein the claw coupling is formed by a radially inwardly facing claw of the coupling element and a corresponding recess of the brake element, with the claw engaging in the recess.
6. The electromotive furniture drive of claim 1 , wherein the wrap spring is configured to wrap around the coupling element with more than one turn.
7. The electromotive furniture drive of claim 1 , wherein the looping wrap spring includes a retaining element at a free end of the looping wrap spring.
8. The electromotive furniture drive of claim 7 , wherein the retaining element is fixed via a housing of the brake device in a stationary manner relative to the housing of the drive motor.
9. The electromotive furniture drive of claim 7 , wherein the retaining element is a hook formed from an end section of the looping wrap spring.
10. The electromotive furniture drive of claim 1 , wherein the drive shaft has a toothing for driving a gear stage.
11. The electromotive furniture drive of claim 10 , wherein the brake device and the toothing are arranged on different sides of the drive motor on the drive shaft.
12. The electromotive furniture drive of claim 1 , wherein the axial bearing has a first bearing surface via which the axial bearing rests against an end face of the drive shaft.
13. The electromotive furniture drive of claim 1 , wherein the axial bearing has a second bearing surface on a cover of a housing of the brake device.