Electrically actuated friction brake
To reduce the attainable actuation times of an electrically actuated friction brake and simultaneously keep the friction brake inexpensive, an electrically actuated friction brake with a brake pad ( 3 ) actuated by an actuation device ( 10 ) is proposed, wherein for braking the actuation device ( 10 ) is driven by a spring and is held open by an electrical actuator ( 12 ), so that the spring actuates the friction brake ( 1 ) in case of a power loss, wherein a first transmission element ( 5 ), that is connected to the brake pad ( 3 ), and a second transmission element ( 8 ) with an elevation curve ( 17 ) are provided and a coupling element ( 15 ) is provided on the first transmission element ( 5 ), wherein a follower element ( 14 ) is arranged on the coupling element ( 15 ) that follows the elevation curve ( 17 ) under the action of the spring for actuating the first transmission element ( 5 ).
1. An electrically actuated friction brake comprising:
a brake pad that exerts a pad pressing force during brake action;
an electric actuator configured to hold the brake pad in a released state;
a first transmission element connected to the brake pad;
a second transmission element having an elevation curve;
a coupling element connected to the first transmission element and being movable relative to the brake pad;
a follower element arranged on the coupling element and being configured to follow the elevation curve; and
a spring that, in case of loss of power, causes the brake pad to exert brake action by causing movement of the first transmission element.
2. The electrically actuated friction brake according to claim 1 , wherein the coupling element is connected to the follower element.
3. The electrically actuated friction brake according to claim 1 , wherein the spring applies a force to a lever.
4. The electrically actuated friction brake according to claim 1 , wherein the coupling element is connected to a first end of a first lever and a second end of the lever is connected to the first transmission element.
5. The electrically actuated friction brake according to claim 1 , wherein the second transmission element is a cam disc and the spring is configured to cause rotation of the cam disc.
6. The electrically actuated friction brake according to claim 1 , further comprising a third transmission element having a configuration similar to the first transmission element and being connected via a lever to the coupling element.
7. The electrically actuated friction brake according to claim 1 , wherein the coupling element comprises a rocker lever.
8. The electrically actuated friction brake according to claim 1 , wherein the elevation curved comprises a follower element stabilizing indentation.
9. The electrically actuated friction brake according to claim 1 , wherein the first transmission element comprises one of:
an eccentric element; or
a cam element.
10. The electrically actuated friction brake according to claim 1 , wherein the first transmission element is coupled to a cam.
11. The electrically actuated friction brake according to claim 1 , further comprising:
a spring lever having follower element coupled to one end; and
a cam coupled to the first transmission element,
wherein the follower element engages with the cam and the spring applies a spring force to the spring lever.
12. The electrically actuated friction brake of claim 1 , further comprising:
a third transmission element connected to the brake pad; and
a parallelogram device that includes:
a first lever having a first end movably coupled to the coupling element and a second end coupled to the first transmission element; and
a second lever having a first end movably coupled to the coupling element and a second end coupled to the third transmission element.
13. An electrically actuated friction brake comprising:
a brake pad that exerts a pad pressing force during brake action;
an electric actuator configured to hold the brake pad in a released state;
a first transmission element connected to the brake pad;
a spring that biases the first transmission element toward a brake action position and that is configured to cause rotation of the first transmission element about a rotation angle;
a second transmission element having an elevation curve and being rotated by the electric actuator,
a coupling element connected to the first transmission element and being movable relative to the brake pad; and
a follower element arranged on the coupling element and being configured to follow the elevation curve under action of the electric actuator when the electric actuator rotates the second transmission element,
wherein, in case of loss of power, the spring causes movement of the first transmission element which, in turn, causes the brake pad to exert brake action.
14. An electrically actuated friction brake comprising:
a brake pad that exerts a pad pressing force during brake action;
an electric actuator;
a coupling element that is movable relative to the brake pad;
an eccentric element arranged between the brake pad and the coupling element;
a spring capable of applying a force sufficient to cause brake action;
a transmission element having an elevation curve and being rotated by the electric actuator; and
a follower element coupled to the coupling element and being configured to follow the elevation curve under action of the electric actuator when the electric actuator rotates the transmission element,
wherein, in case of loss of power, the eccentric element is caused to move which, in turn, causes the brake pad to exert brake action.
15. The electrically actuated friction brake of claim 14 , further comprising a parallelogram device that includes:
a first lever having a first end rotatably coupled to the coupling element and a second end coupled to the eccentric element; and
a second lever having a first end rotatably coupled to the coupling element and a second end coupled to a third transmission element.
16. The electrically actuated friction brake of claim 14 , wherein the coupling element is a rocker lever having a knee joint, a first leg, and a second leg coupled to the eccentric element.
17. The electrically actuated friction brake of claim 14 , further comprising a spring cam and a spring follower element movably contacting the spring cam, wherein the spring biases the spring follower element toward contact with the spring cam.