Drive unit for electromechanical brake, electromechanical brake and vehicle brake system

Abstract

The invention relates to a drive unit for an electromechanical brake, an electromechanical brake and a vehicle brake system, the drive unit (100) for an electromechanical brake having an electric motor (9), a transmission (1) and a control unit (5), the control unit (5) having a circuit board and a housing (12), and the transmission (1) having a housing cover (2), the housing (12) and the housing cover (2) enclose the motor (9) and the circuit board at least partially forming a housing.

Description

Technical Field

[0001] The invention relates to a drive unit for an electromechanical brake, to an electromechanical brake and to a vehicle brake system having at least one such electromechanical brake. Background Art

[0002] The service brake is usually a brake that uses brake fluid to press the brake piston together with the brake lining onto the brake disk to brake the vehicle. However, the parking brake is designed as an electromechanical brake. In the process of increasing electrification of the components in motor vehicles, the service brake should also be designed as an electromechanical brake, so that the brake fluid and the complex valve and line structure associated with it can be omitted. Such an electromechanical brake can also significantly reduce maintenance costs.

[0003] EP 0 944 781 B1 discloses an electromechanically actuatable brake which presses a brake lining against a brake disk for braking. Summary of the invention

[0004] The core of the invention is a drive unit for an electromechanical brake having an electric motor, a transmission and a control unit, wherein the control unit has a printed circuit board and a housing, and the transmission has a housing cover, wherein the housing and the housing cover at least partially form a housing surrounding the motor and the printed circuit board.

[0005] The background of the invention is that the drive unit can be designed to be very compact. The motor can be directly connected to the control unit in the housing.

[0006] Advantageously, the motor, which is uncovered on one side, can be introduced into the housing from one side during assembly of the drive unit and can be simultaneously sealed with the housing of the control unit.

[0007] Further advantageous embodiments of the invention are the subject matter of the dependent claims.

[0008] According to an advantageous embodiment, the motor comprises a rotor, a motor housing, a first bearing and a second bearing, wherein the rotor is supported by means of the first bearing and the second bearing, in particular, wherein the first bearing is accommodated in the housing cover and the second bearing is accommodated in the motor housing. This has the advantage that the number of bearings can be reduced.

[0009] Furthermore, it is advantageous if the motor has a rotation sensor arranged between the motor housing and the housing. Thus, the rotation sensor is arranged outside the motor housing and inside the housing. As a result, the rotation sensor can be directly connected to the control unit.

[0010] Advantageously, a wall is arranged between the circuit board and the motor, by means of which the circuit board can be electrically and / or electromagnetically isolated and / or hermetically sealed, thereby protecting the circuit board from interference currents and dirt.

[0011] In this case, it is advantageous if the wall has a lead-through for the phase and / or ground connection of the motor. As a result, the printed circuit board is contactable and can be connected to the motor.

[0012] According to a further advantageous embodiment, the housing cover is designed integrally with the housing part, in particular wherein a further sealing device is arranged between the housing part and the wall. This has the advantage that the motor and the printed circuit board can be assembled from one side of the drive unit. As a result, the drive unit does not have to be rotated during assembly.

[0013] According to an alternative advantageous design, the wall portion is designed integrally with the housing portion. As a result, the circuit board and the motor are safely separated from each other.

[0014] According to another advantageous embodiment, the control unit has a control section for the parking brake, which is arranged in the housing, in particular, wherein the control section is arranged adjacent to the motor and the housing cover. As a result, the drive unit can be designed to be very compact. Advantageously, the control section is arranged here to be separated from the rotation sensor.

[0015] Furthermore, it is advantageous if the housing has a housing part and a cover part, wherein a second sealing element is arranged between the housing part and the cover part, thereby enabling the housing to be sealed in a gas-tight manner.

[0016] Advantageously, the circuit board is arranged between the wall and the cover part. When assembling the drive unit, the circuit board can therefore be installed from the opening of the housing part facing the cover part before the cover part is connected to the housing part. Advantageously, the motor and the circuit board can be installed from two opposite sides of the housing.

[0017] In this case, it is advantageous if a first sealing element is arranged between the housing, in particular the housing part, and the housing cover, so that the housing can be sealed in a gas-tight manner.

[0018] The core of the invention is an electromechanical brake having a drive unit for an electromechanical brake, in particular a drive unit as described above or according to any of the claims relating to a drive unit for an electromechanical brake.

[0019] The background of the invention is that electromechanical brakes can be designed to be very compact.

[0020] The core of the invention is that a vehicle brake system has at least one electromechanical brake as described above or according to a claim relating to an electromechanical brake.

[0021] Background of the present invention is that the vehicle brake system can be designed very compactly. Here, each electromechanical brake can be controlled individually.

[0022] Advantageously, the vehicle brake system has two electromechanical brakes per axle, in particular one electromechanical brake per wheel of the vehicle.

[0023] As long as it makes sense, the above-mentioned designs and improvements can be combined with each other arbitrarily. Other feasible designs, improvements and embodiments of the present invention also include combinations of features of the present invention described above or below with respect to the embodiments that are not explicitly mentioned. In particular, those skilled in the art also add various aspects as improvements or supplements to the corresponding basic forms of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the following section, the invention is explained using embodiments, from which further inventive features can be derived, but the scope of the invention is not limited thereto. Embodiments are shown in the accompanying drawings. In which:

[0025] Figure 1 An exploded view of a drive unit 100 for an electromechanical brake according to an embodiment of the present invention is shown in an oblique view.

[0026] Figure 2 An exploded view of the drive unit 100 is shown in side view, and

[0027] Figure 3 A cross-sectional view of the drive unit 100 is shown. DETAILED DESCRIPTION

[0028] In the figures, the same reference signs indicate identical or functionally identical elements.

[0029] Figure 1 and Figure 2 The drive unit 100 shown for an electromechanical brake has a transmission 1 , an electric motor 9 and a control unit 5 . The control unit 5 controls the motor 9 , which drives the transmission 1 .

[0030] The transmission 1 comprises a transmission housing 11, a housing cover 2, a drive shaft 10 and an output shaft. The drive shaft 10 is connected to the rotor of the motor 9 in a rotationally fixed manner. Here, the drive shaft 10 can be designed as a pinion shaft.

[0031] The output shaft of the transmission device 1 is connected to a spindle drive assembly (not shown in the drawings), which in turn is connected to a brake piston that can be moved between a braking position and a rest position.

[0032] The control unit 5 has a housing 12, which has a housing part 7 and a cover part 6, and a plug connector connection part 4. The housing part 7 has a first sealing surface 8, by means of which the transmission housing 11 and the housing cover 2 can be connected. The housing part 7 has a second sealing surface, by means of which the transmission housing 11 and the cover part 6 can be connected. In this case, the cover part 6 is arranged opposite the housing cover 2, and the housing part 7 is arranged between the cover part 6 and the housing cover 2. The plug connector connection part 4 is arranged at the cover part 6, in particular next to the housing part 7. In this case, the plug connector connection part 4 and the housing part 7 extend in the same direction.

[0033] The motor 9 has a motor housing 3. The motor 9 is arranged in a housing 12 of the control unit 5. Here, the cover part 6, the housing part 7 and the housing cover 2 at least partially form a housing around the motor 9. A drive shaft 10 extends from the transmission 1 through a recess in the housing cover 2 to the motor 9.

[0034] Figure 3 Further details of the drive unit 100 are shown in a sectional view. Here, a section through the axis of rotation 36 of the motor 9 is shown.

[0035] The motor 9 has a rotor which is supported by means of a first bearing 20 and a second bearing 37. A rotation sensor 21 or a rotation transmitter for determining the position of the rotor is arranged on the outside of the motor housing 3 opposite the second bearing 37. The first bearing 20 extends at least partially into the housing cover 2. Preferably, the first bearing 20 is accommodated in the housing cover 2 so that the first end of the rotor is supported by means of the first bearing 20 in the housing cover 2 and the second end of the rotor is supported by means of the second bearing 37 in the motor housing 3.

[0036] The rotor and stator 40 of the motor 9 are arranged in the motor housing 3 .

[0037] The control unit 5 has a circuit board 35 arranged in the housing 12. Here, a wall 39 is arranged between the circuit board 35 and the motor 9, which wall is connected to the housing part 7, in particular, wherein the wall 39 and the housing part 7 are designed as one piece. Here, the circuit board 35 is arranged between the wall 39 and the cover part 6, so that the housing part 7, the cover part 6 and the wall 39 surround the circuit board 35 in a manner that forms a housing.

[0038] The stator 40 has a winding 40 which is electrically conductively connected to the printed circuit board 35. For this purpose, the motor 9 has a connection element 41 which is connected to the printed circuit board 35 by means of three phase conductors 34. Preferably, the phase conductors 34 each have a flat plug which is received in a corresponding sleeve of the connection element 41.

[0039] The phase conductors 34 of the printed circuit board 35 and the ground connection 38 which is electrically connected to the motor housing 3 are guided through the wall 39 by means of a lead-through.

[0040] The printed circuit board 35 is connected to the plug connector connection 4 by means of bridges 33 . The bridges 33 are designed as three-phase bridges. The bridges 33 are arranged between the printed circuit board 35 and the cover part 6 .

[0041] The control unit 5 has a control section 31 for the parking brake. Here, the control section 31 is arranged in the housing 12, adjacent to the motor 9 and the housing cover 2. Therefore, the control section 31 is arranged at a distance from the second bearing 37.

[0042] A second seal 32 is arranged between the cover part 6 and the housing part 7. A first seal 30 is arranged between the housing cover 2 and the housing part 7.

[0043] According to an alternative embodiment not shown in the figures, the housing part 7 is designed in one piece with the housing cover 2. In this case, the wall 39 is designed separately and a further seal is arranged between the wall 39 and the housing part 7. For assembly, the housing part 7 and the housing cover 2 are connected to the transmission housing 11 and then the motor 9 is connected to the transmission 1. The wall 39 is then inserted and sealed with respect to the housing part 7 by means of a further seal. Thereafter, the circuit board 35 is assembled and connected. Finally, the housing part 7 is closed with the cover part 6, wherein the second seal 32 is arranged between the cover part 6 and the housing part 7.

Claims

1. A drive unit (100) for an electromechanical brake, comprising an electric motor (9), a transmission (1) and a control unit (5), It is characterized in that The control unit (5) has a circuit board (35) and a housing (12), and the transmission device (1) has a housing cover (2). The housing (12) and the housing cover (2) at least partially form a housing that surrounds the motor (9) and the circuit board (35).

2. The drive unit (100) according to claim 1, characterized in that: The motor (9) comprises a rotor, a motor housing (3), a first bearing (20) and a second bearing (37). wherein the rotor is supported by means of the first bearing (20) and the second bearing (37), In particular, the first bearing (20) is accommodated in the housing cover (2), and the second bearing (37) is accommodated in the motor housing (3).

3. The drive unit (100) according to claim 2, characterized in that: The motor (9) has a rotation sensor (21) arranged between the motor housing (3) and the housing (12).

4. The drive unit (100) according to any one of the preceding claims, characterized in that A wall (39) is arranged between the circuit board (35) and the motor (9), wherein the wall (39) has a lead-through for a phase conductor (34) and / or a ground connection (38) of the motor (9).

5. The drive unit (100) according to any one of the preceding claims, characterized in that The housing (12) comprises a housing part (7) and a cover part (6), wherein in particular a second sealing element (32) is arranged between the housing part (7) and the cover part (6).

6. The drive unit (100) according to claim 5, characterized in that: The housing cover (2) is designed integrally with the housing part (7), in particular wherein a further sealing device is arranged between the housing part (7) and the wall (39).

7. The drive unit (100) according to claim 5, characterized in that: The wall portion (39) is designed integrally with the housing portion (7).

8. The drive unit (100) according to any one of the preceding claims, characterized in that A first sealing element (30) is arranged between the housing (12), in particular the housing part (7), and the housing cover (2).

9. The drive unit (100) according to any one of the preceding claims, characterized in that The control unit (5) has a control section (31) for the parking brake, wherein the control section (31) is arranged in the housing (12), in particular, wherein the control section (31) is arranged adjacent to the motor (9) and the housing cover (2).

10. An electromechanical brake having a drive unit (100) according to any one of the preceding claims. 11 . A vehicle brake system having at least one electromechanical brake according to claim 10 .

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