ELECTROMECHANICAL DISK BRAKE HAVING A PARKING BRAKE ACTUATOR FOR MOTOR VEHICLES

Abstract

The disclosure relates to an electromechanical disk brake having a parking brake actuator for motor vehicles. Parking brake actuators are used to prevent a vehicle from rolling away from the stationary state. In conventional disk brakes, a brake cylinder which is assigned to the disk brake is generally equipped with a mechanically actuated parking brake function. At the same time, the principle of the parking brake function used in a conventional disk brake cannot be used. It is an object of the disclosure to provide an electromechanical disk brake having a parking brake actuator, which is cost-effective and needs little construction space. The object can, for example, be achieved via an electromechanical disk brake having a parking brake actuator embodied as an electromagnetic linear drive.

Claims

1. An electromechanical disk brake for motor vehicles, the electromechanical disk brake comprising: an electromechanical actuator having an electric motor with an electric motor housing and a rotor; a transmission configured to apply a brake pad to a brake disk of the electromechanical disk brake; said transmission being configured to convert a rotating movement of said electric motor into a translatory movement; said electromechanical actuator having an electromagnetic linear drive; and, wherein said electric motor can be arrested by said electromechanical linear drive.

2. The electromechanical disk brake of claim 1, wherein said linear drive has a plunger and said rotor has latching grooves; and, said plunger is configured to engage said latching grooves of said rotor in order to arrest said electric motor.

3. The electromechanical disk brake of claim 1, wherein said linear drive is embodied as a solenoid.

4. The electromechanical disk brake of claim 2, wherein said linear drive is arranged radially, in a direction of said latching grooves, in said electric motor housing.

5. The electromechanical disk brake of claim 2, wherein said electric motor is an external-rotor motor; and, said latching grooves are arranged on said rotor in a form-fitting manner in a radial direction.

6. The electromechanical disk brake of claim 2, wherein said linear drive is arranged axially parallel to an electric motor axis (AEM), in a direction of said latching grooves, in said electric motor housing.

7. The electromechanical disk brake of claim 6, wherein said electric motor is an external-rotor motor; and, said latching grooves are arranged on said rotor in a form-fitting manner in an axially parallel direction.

8. The electromechanical disk brake of claim 6 further comprising: a motor control unit; and, said linear drive being, for an electrical activation of said linear drive, connected to said motor control unit.

9. The electromechanical disk brake of claim 8, wherein said motor control unit has a baseplate; and, said baseplate is at least in sections part of said electric motor housing.

10. The electromechanical disk brake of claim 9, wherein said baseplate has bores; said bores are configured to provide a passage of a connecting line; and, said bores have a thermoplastic compound for sealing said bores.

11. The electromechanical disk brake of claim 10, wherein said linear drive is fixed in said electric motor housing by said thermoplastic compound.

12. The electromechanical disk brake of claim 1, wherein said transmission has a cam disk for converting the rotating movement of the electric motor into the translatory movement; and, the electromechanical disk brake is a sliding calliper disk brake.

13. The electromechanical disk brake of claim 1 further comprising: a motor control unit; a cable connection; and, said linear drive being connected to said motor control unit via said cable connection for an electrical activation of said linear drive.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The invention will now be described with reference to the drawings wherein:

[0024] FIG. 1 shows a schematic illustration of an electromechanical disk brake, known from the prior art, with an electromechanical actuator;

[0025] FIG. 2 shows a sectioned side view of an electromechanical actuator according to FIG. 1 with a parking brake actuator, which is embodied as a linear drive and is integrated, according to a first embodiment; and,

[0026] FIG. 3 shows a sectioned side view of the electromechanical actuator according to FIG. 1 with a parking brake actuator, which is embodied as a linear drive and is integrated, according to a second embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] FIG. 1 shows an electromechanical disk brake 1. The disk brake 1 is embodied as a sliding calliper disk brake. A calliper 21 is mounted so as to slide axially on a brake anchor plate 23 via two plain bearings 22, 22a. An electromechanical actuator 20 applies a brake disk 32 via a rim-side brake pad 25 and an application-side brake pad 25a.

[0028] FIG. 2 shows the electromechanical actuator 20 having a parking brake actuator in a first embodiment for an electromechanical disk brake 1 according to FIG. 1 in detail. The electromechanical actuator 20 has an electric motor 2 axially along an electric motor axis AEM. The electric motor 2 is connected axially via a shaft 26 to a cam disk 18. Starting from the electric motor axis AEM, the cam disk 18 is arranged radially in the electromechanical actuator 20. The cam disk 18 which is operatively connected to the electric motor 2 is configured to convert a drive torque, that is, a rotating movement of the electric motor 2 about the electric motor axis AEM, into a translatory movement, that is, a linear movement, for actuating a brake plunger 27. The brake plunger 27 serves for actuating a rotary lever, not shown, for applying the brake disk 32. Furthermore, the electric motor 2 includes a transmission 5 which is arranged axially along the electric motor axis AEM and which is intended for applying a desired drive torque. A motor control unit 13 for regulating the actuator 20 is arranged in the electric motor housing 15 radially above the transmission 5. The motor control unit 13 is therefore integrated in a space-saving manner in the electric motor 2. A rotor 13 which is provided with latching grooves 10 is arranged in the electric motor 2 axially between the transmission 5 and the cam disk 18. During an actuation movement of the electromechanical actuator 20, the rotor 3 rotates about the electric motor axis AEM. The latching grooves 10 are arranged at uniform intervals along a circumferential surface 30 of the rotor 3. The rotor 3 surrounds an electromagnetic stator 29, referred to below as stator 29, of the electric motor 2. The rotor 3 predominantly takes on no electromagnetic function, contrary to the stator 29, and therefore the latching grooves 10 are arranged directly on the circumferential surface 30 of the rotor 3. For the engagement of a parking lock, a linear drive 6 which is configured as a parking brake actuator is arranged in the actuator 20 radially above the rotor 3. The linear drive 6 is embodied as a solenoid 6. For electrical activation of the solenoid 6, a cable connection 12 is connected to the solenoid 6 and to the motor control unit 13. For the engagement of the parking lock function, the rotor 3 rotates into a position in which a latching groove 10 and a plunger 7 of the solenoid 6 are arranged radially in a line so that the plunger can engage in the latching groove 10 on the rotor 3 and secures the electric motor 2 against rotation about the electric motor axis AEM. To release the parking lock function, the magnetic field of the solenoid 6 is changed so that the plunger 7 is moved back radially into the starting position, that is, out of the latching groove 10.

[0029] FIG. 3 shows the electromechanical brake actuator 20 according to FIG. 1 in a second alternative embodiment. The electromechanical actuator 20 is shown in a laterally sectioned view. In the second embodiment, the linear drive 6, which is configured as a parking brake actuator 6, is arranged in the electric motor 2 axially parallel to the electric motor axis AEM. In the second embodiment, the linear drive 6 is also embodied as a solenoid 6. The solenoid 6 is at the same time part of the electric motor housing 15. In more precise terms, the solenoid 6 is arranged axially between the motor control unit 13 and the rotor 3. A coil 31 for generating an electromagnetic field encases the plunger 7. Connecting lines 19 for connecting the solenoid 6 to the motor control unit 13 are guided through the baseplate 14 of the motor control unit 13 via bores 16. The bores 16 and the coil 31 are potted with a thermoplastic compound 17, wherein the coil 31 is fixed at the same time by the thermoplastic compound 17. In the second embodiment, the latching grooves 10 for engagement of the plunger 7 are arranged axially parallel on the rotor 3.

[0030] It is understood that the foregoing description is that of the preferred embodiments of the invention and that various changes and modifications may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.

LIST OF REFERENCE SIGNS AS PART OF THE DESCRIPTION

[0031] 1 Electromechanical disk brake [0032] 2 Electric motor [0033] 3 Rotor [0034] 5 Transmission [0035] 6 Parking brake actuator, linear drive, solenoid [0036] 7 Plunger [0037] 10 Latching grooves [0038] 12 Cable connection [0039] 13 Motor control unit [0040] 14 Baseplate of the motor control unit 13 [0041] 15 Electric motor housing [0042] 16 Bores [0043] 17 Thermoplastic compound [0044] 18 Cam disk [0045] 19 Connecting line of the motor control unit 13 [0046] 20 Electromechanical actuator [0047] 21 Calliper [0048] 22, 22a Plain bearings [0049] 23 Brake anchor plate [0050] 25 Rim-side brake pad [0051] 25a Application-side brake pad [0052] 26 Shaft [0053] 27 Brake plunger [0054] 29 Stator [0055] 30 Circumferential surface of the rotor 3 [0056] 31 Coil [0057] AEM Electric motor axis