초록 ▼

An actuating unit for an electromechanically actuatable disk brake for motor vehicles consists essentially of a drive unit (1), i.e., an electric motor (11); an actuating element (7), by means of which one (4) of two friction linings (4, 5) mounted with limited freedom of movement in a brake caliper

An actuating unit for an electromechanically actuatable disk brake for motor vehicles consists essentially of a drive unit (1), i.e., an electric motor (11); an actuating element (7), by means of which one (4) of two friction linings (4, 5) mounted with limited freedom of movement in a brake caliper can be brought into engagement with a brake disk (6); and a first and a second reducing gear (2, 3). An electronic controller (8), which serves to drive the electric motor (11), is assigned to the actuating unit. To realize an actuating unit of compact axial dimensions which is also optimally designed with respect to packaging, at least part of the electronic controller (8) is mounted between the electric motor (11) and the housing (25) which holds the second reducing gear (3).

대표청구항 ▼

The invention claimed is: 1. An actuating unit for an electromechanically actuatable disk brake for motor vehicles mounted on a brake caliper, with two friction linings (4, 5) being mounted in the caliper with freedom to move within a limited range, each of which works together with one of the late

The invention claimed is: 1. An actuating unit for an electromechanically actuatable disk brake for motor vehicles mounted on a brake caliper, with two friction linings (4, 5) being mounted in the caliper with freedom to move within a limited range, each of which works together with one of the lateral surfaces of a brake disk (6), where an actuating element (7) of the actuating unit brings one of the friction linings (4) into engagement with the brake disk (6) directly, whereas the other friction lining (5) is brought into engagement with the brake disk (6) indirectly through the action of the reaction force applied by the brake caliper, where the actuating unit consists of an electric motor (11); a first reducing gear (2), which acts between the electric motor (11) and the actuating element (7); and a second reducing gear (3), which acts between the electric motor (11) and a part of the first reducing gear (2) and is held in place by a housing, and where an electronic controller, which serves to drive the electric motor, is also assigned to the actuating unit, wherein at least part of the electronic controller (8) is mounted between the electric motor (11) and the housing (25) which holds the second reducing gear (3). 2. The actuating unit according to claim 1, wherein the electronic controller (8) has a housing (23) with a flange (24), which is mounted between the electric motor (11) and the housing (25) for the second reducing gear (3) and holds all of the electrical interfaces between the electric motor (11) and the electronic controller (8) and the mechanical interfaces between the electric motor (11) and the second reducing gear (3). 3. The actuating unit according to claim 2, wherein the electrical interface between the electric motor (11) and the electronic controller (8) is designed as a plug-and-socket connection (28, 29). 4. The actuating unit according to claim 3, wherein the plug or male part (28) is assigned to the electric motor (11), whereas the socket or female part (29) is assigned to the electronic controller (8). 5. The actuating unit according to claim 4, wherein the socket or female part (29) is molded into the flange (24). 6. The actuating unit according to claim 3, wherein the electrical interface (28, 29) serves to supply power to the electric motor (11). 7. The actuating unit according claim 1, wherein the electric motor (11) is designed as a brushless, electronically commutated direct-current motor, and wherein a sensor arrangement (26, 27) is provided for sensing the position of the rotor of the electric motor (11). 8. The actuating unit according to claim 7, wherein the sensor arrangement (26, 27) for sensing the position of the rotor of the electric motor (11) comprises an encoder wheel (26) mounted on the shaft (13) of the electric motor (11) and a sensor element (27), which cooperates with the encoder wheel (26). 9. The actuating unit according to claim 8, wherein the sensor element (27) is mounted on an end plate (30), which closes off the electric motor (11), carries an electrical connector (28), and serves to support the shaft (13) of the electric motor (11). 10. The actuating unit according to claim 9, wherein the electrical connector is a plug (28) which serves as an electrical contact for the sensor element (27). 11. The actuating unit according to claim 8, wherein the sensor element (27) is permanently connected to the housing (23) of the electronic controller (8). 12. The actuating unit according to claim 8, wherein the sensor element (27) is mounted with a certain limited freedom of movement with respect to the housing (23) of the electronic controller (8) and is connected to it by means of an elastic fastening. 13. The actuating unit according to claim 1, wherein a torque-free plug-in connection (20), is provided between the first (2) and the second reducing gear (3). 14. The actuating unit according to claim 13, wherein the plug-in connection (20) is designed at the end of the drive element (spindle) (17) of the first reducing gear (2). 15. The actuating unit according to claim 1, wherein the electric motor (11) and a part of the second reducing gear (3) are radially offset from the longitudinal axis of the first reducing gear (2). 16. The actuating unit according to claim 15, wherein the electric motor (11) and a part of the second reducing gear (3) are axially parallel to the longitudinal axis of the first reducing gear (2). 17. The actuating unit according to claim 1, wherein an additional electrical interface is provided between the first gear and the second gear to connect electrically a force-sensing element mounted in the first gear to the electronic controller. 18. The actuating unit according to claim 17, wherein the interface also serves the additional purpose of fastening the electronic controller mechanically to the brake caliper.