Electromechanical brake

Abstract

The invention relates to an electromechanical brake (10) for a motor vehicle. The electromechanical brake (10) comprises an electric motor (14) which rotationally drives a spindle drive unit (34) arranged in a caliper housing (42) by means of a transmission (26) so that a brake regulator (54) can move in the axial direction to apply a braking force. Furthermore, the electromechanical brake (10) comprises a parking brake device (62), by means of which the brake actuator (54) can be fixed in an axial position. According to the invention, the parking brake system (62) has a detent pawl device (70), which interacts with a pinion (66) arranged on the spindle drive unit (34) in order to fix the position of the brake actuator (54). The detent pawl device (70) is held by a separate plate (82) inserted into the caliper housing (42).

Description

Technical Field

[0001] This invention relates to an electromechanical brake for a motor vehicle. Furthermore, this invention also relates to a motor vehicle having such an electromechanical brake. Background Technology

[0002] Typically, service brakes are brakes that use brake fluid to press the brake piston and brake pads against the brake disc to stop the vehicle. With the increasing electrification of assemblies in motor vehicles, service brakes should also be constructed as electromechanical brakes, thus eliminating the need for brake fluid and related complex valve and piping structures. Such electromechanical brakes can also significantly reduce maintenance costs.

[0003] Document WO 2020 / 230000 A1 describes an electromechanical disc brake having a brake caliper housing in which a pressure device is arranged to preload the brake pads. The pressure device includes a screw drive unit with a lead screw and a lead screw nut capable of axial movement. The lead screw nut is connected to a reduction gear. Furthermore, an angular contact ball bearing is provided, which rotatably supports the lead screw nut and bears the axial force of the lead screw nut.

[0004] Document EP 1 030 979 B1 discloses an electromechanical braking device for braking wheels. This braking device has a brake caliper in which an electric motor is arranged. The electric motor drives a lead screw transmission unit, which causes brake pads arranged on the brake caliper to press against the brake disc for braking.

[0005] Although electromechanical brakes are well-known in the prior art, there is ongoing effort to provide one that is lighter and cheaper to manufacture than competitors. For example, the economics of electromechanical brakes can be improved by reducing material costs, decreasing the number of parts, making parts easier to manufacture, or making the electromechanical brake easier to assemble. Summary of the Invention

[0006] The purpose of this invention is to provide an electromechanical brake for motor vehicles that can be manufactured more easily and economically.

[0007] This objective is achieved by an electromechanical brake having the subject matter of claim 1. Preferred embodiments are derived from the dependent claims.

[0008] This invention provides an electromechanical brake for a motor vehicle. The electromechanical brake includes an electric motor that drives a screw drive unit disposed in a brake caliper housing to rotate via a transmission device, thereby enabling a brake adjuster to move axially to apply braking force. The electromechanical brake also includes a parking brake device that can fix the brake adjuster in an axial position. The parking brake device has a stop pawl device that works in conjunction with a pinion disposed on the screw drive unit to fix the position of the brake adjuster. The stop pawl device is held by a separate plate fitted into the brake caliper housing.

[0009] The parking brake device refers to a device that keeps the brake in a braking state when the vehicle is parked. According to the invention, the parking brake device has a stop pawl device that works in conjunction with a pinion to lock the rotation of the pinion in at least one direction. According to the invention, the stop pawl device is fastened to a plate. The plate refers to a component whose material thickness is significantly less than its length and width. Advantageously, the normal vector of the plate is parallel to the axis of the lead screw drive unit.

[0010] By fastening the stop pawl device to a separate plate relative to the brake caliper housing, the stop pawl device can be easily secured to the plate outside the brake caliper housing. Therefore, the plate with the stop pawl device can be assembled into the brake caliper housing together, simplifying the assembly process. Consequently, there is no need to consider the fastening of the stop pawl device to the brake caliper housing, making it easier to construct the brake caliper housing. This also reduces the manufacturing and assembly costs of the brake caliper housing.

[0011] In a preferred embodiment of the invention, the plate is form-fitted within the brake caliper housing. Form-fit means that the plate at least partially has the inner contour of the brake caliper housing that accommodates it. Due to the form-fit design of the plate, it cannot rotate within the brake caliper housing. Therefore, no additional fasteners are required to secure the plate to the brake caliper housing. This simplifies the assembly of the plate. Furthermore, the elimination of fasteners reduces weight and cost.

[0012] In another preferred embodiment of the invention, the stop pawl device has a pin and a stop pawl supported on the pin in a rotatable manner, wherein the pin is press-fitted into a plate. By press-fitting the pin into the plate, no fasteners are required to secure the stop pawl device. This simplifies the fastening of the stop pawl device. Since the device is fastened to the plate, it need not be fastened to the brake caliper housing, thus facilitating the construction of the brake caliper housing. Furthermore, the stop pawl device can be easily installed into the brake caliper housing along with the plate, thereby facilitating assembly into the brake caliper housing.

[0013] Preferably, the brake caliper housing has an opening in the area of ​​the stop pawl device to allow manual unlocking of the stop pawl device. The advantage of such an opening is that the stop pawl device can be unlocked without disassembling the brake caliper housing. Therefore, the stop pawl device can be quickly unlocked from the outside to allow, for example, towing of the vehicle. Advantageously, the opening is closed only by a removable closure. This closure protects the interior of the brake caliper housing from dirt and moisture.

[0014] In an advantageous improvement, the brake caliper housing consists of two interconnected housing components, wherein the housing component in which the parking brake device is housed is closed at one axial end. Dividing the brake caliper housing into two housing components has the advantage that each housing component can be better constructed to meet requirements. Consequently, the housing component connected to the brake caliper can be constructed from a more robust material. In contrast, the housing component housing the braking device can be constructed from a lighter material with a smaller wall thickness. This reduces the weight of the electromechanical brake and lowers material costs.

[0015] An additional advantage of dividing the housing into two parts is that components can be more easily installed into the housing component of the brake caliper housing. The housing component housing the parking brake device is advantageously can-shaped. At its open end, this housing component connects to another housing component of the brake caliper housing. This eliminates the need for a cover, thus simplifying assembly. More precisely, the housing component housing the parking brake device is closed through its connection to the other housing component.

[0016] Advantageously, the housing component in which the parking brake device is housed is a deep-drawn part. Here, a deep-drawn part is a component manufactured using a deep-drawing process. Deep-drawing is a simple and economical method for manufacturing components. This housing component can be produced quickly and in large quantities through the deep-drawing process.

[0017] In another advantageous embodiment, the parking brake device has a parking brake actuator to actuate a stop pawl device, wherein the parking brake actuator is fastened to a plate. Therefore, the parking brake actuator is not fastened to a housing. Accordingly, there is no need to provide a fastening area or fastening device for the parking brake actuator via the brake caliper housing. This simplifies the manufacture of the brake caliper housing. Furthermore, by fastening the parking brake actuator to a plate, the parking brake actuator can be easily installed into the brake caliper housing along with the plate during assembly. This simplifies the assembly of the electromechanical brake.

[0018] According to a suitable embodiment, the electrical connection lines between the control unit that controls the electric motor and the electric motor are arranged on a plate. These connection lines can be securely fastened to the plate. Alternatively, the connection lines can be constructed as conductive rails on the plate. By designing the connection lines and plate in this way, both components can be arranged in a space-saving manner within the brake caliper housing. Accordingly, the brake caliper housing can be constructed to be smaller. Furthermore, it is easier to integrate the connection lines into the brake caliper housing, thereby simplifying the manufacture of the electromechanical brake.

[0019] According to another suitable embodiment, the sheet metal has multiple material cutouts. These material cutouts refer to areas where no material is present. Therefore, the weight and material cost of the sheet metal can be reduced by using these material cutouts.

[0020] Advantageously, the sheet metal is a stamped part. A stamped part, as used herein, refers to a component manufactured by a stamping method. This method is a simple manufacturing method that allows for the rapid and economical production of such sheet metal.

[0021] The present invention also provides a motor vehicle having such an electromechanical brake. Such a motor vehicle can achieve the advantages and features described above. Attached Figure Description

[0022] Embodiments of the present invention are shown in the accompanying drawings and explained in more detail in the following description. The drawings show:

[0023] Figure 1 This is a longitudinal section view of an electromechanical brake according to an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the housing component of the parking brake device;

[0025] Figure 3 This is a longitudinal cross-sectional view of the housing component of a parking brake device according to another embodiment of the present invention;

[0026] Figure 4 This is a perspective view of a housing component according to another embodiment of the present invention; and

[0027] Figure 5 It is based on Figure 4 Another view of the housing component shown. Detailed Implementation

[0028] Figure 1 A longitudinal sectional view of an electromechanical brake 10 according to an embodiment of the present invention is shown. The electromechanical brake 10 includes [missing information - likely referring to a feature or function] only [missing information - likely referring to a feature or function] Figure 2The electric motor 14 shown drives a transmission device 26 consisting of a worm gear 18 and a worm wheel 22. The worm wheel 22 is fixed to the lead screw 30 of the lead screw drive unit 34 in a non-rotatable manner. Accordingly, the lead screw 30 of the lead screw drive unit 34 can also be driven by rotating the worm wheel 22. In the illustrated embodiment, the lead screw drive unit 34 is a ball screw driver. The lead screw 30 is supported in a brake caliper housing 42 in a rotatable manner by means of an angular contact ball bearing 38. The brake caliper housing 42 is connected to the brake caliper 46 of the electromechanical brake 10. By rotating the lead screw 30, the lead screw nut 50 of the lead screw drive unit 34 can be adjusted axially. A brake adjuster 54 is mounted at one axial end of the lead screw nut 50, which can move axially together with the lead screw nut 50 to apply braking force.

[0029] In the embodiment shown here, the brake caliper housing 42 is constructed in two parts. Two housing components 42a and 42b are connected to each other in a connection area 58. To fix the axial position of the brake adjuster 54, a parking brake device 62 is arranged in housing component 42a, which is opposite to the brake caliper 46. This parking brake device 62 includes a pinion 66, which is fixed in a non-rotatable manner to the axial end of the lead screw 30 opposite to the brake adjuster 54. The pinion 66 works in conjunction with the stop pawl device 70 to lock the axial movement of the brake adjuster 54 in the brake release direction.

[0030] The stop pawl device 70 includes a stop pawl 74, which is supported by a pin 78 in a rotatable manner. The pin 78 is press-fitted into a separate plate 82 arranged in a housing component 42a of the brake caliper housing 42. Thus, the stop pawl device 70 is held in the brake caliper housing 42 by the plate 82. For inserting the plate 82 into the housing component 42a, the housing component has a cover 86 at its axial end opposite the connection area 58.

[0031] Figure 2 A cross-sectional view of the housing component 42a of the parking brake device 62 is shown. This view shows a plate 82 inserted into the housing component 42a. The plate 82 is shaped-fittingly arranged within the housing component 42a such that the pin 78 can transmit torque to the housing component 42a via the plate 82. Therefore, the general outer contour of the plate 82 corresponds to the inner contour of the housing component 42a. The plate 82 also has multiple material cutouts 90, which reduce the weight of the plate 82.

[0032] The figure also shows a parking brake adjuster 94 fastened to plate 82. This parking brake adjuster 94 allows the stop pawl 74 to move, thereby engaging with the pinion 66 to lock the axial movement of the brake adjuster 54. Furthermore, an electrical connection line 98 is arranged on plate 82, through which the electric motor 14 is connected to the control unit 102. The connection line 98 can be fastened to plate 82 or constructed as a conductive rail on the plate.

[0033] Figure 3 A longitudinal sectional view of the housing component 42a of a parking brake device 62 according to another embodiment of the present invention is shown. The embodiment shown in this figure is similar to... Figure 1 The difference from the initial example shown is that housing component 42a does not have a lid 86. Instead, housing component 42a is closed and can-shaped. Thus, housing component 42a can be a simple deep-drawn part. In this embodiment, the connecting line 98 is not arranged on the plate 82, but extends as a separate line below the plate 82.

[0034] Figure 4 A perspective view of a housing component 42a according to another embodiment of the present invention is shown. In this embodiment, it can be seen that the housing component 42a has an opening 106. Figure 5 As shown, the opening 106 is constructed in the area of ​​the parking brake device 62. For example, when being towed, the parking brake device 62 can be unlocked through the opening 106.

Claims

1. An electromechanical brake (10) for a motor vehicle, the electromechanical brake comprising an electric motor (14) that drives a screw drive unit (34) arranged in a brake caliper housing (42) to rotate via a transmission device (26), thereby enabling a brake adjuster (54) to move axially to apply braking force, wherein, A parking brake device (62) is provided, which can fix the brake adjuster (54) in an axial position. Its features are, The parking brake device (62) has a stop pawl device (70) that works in conjunction with a pinion (66) arranged on the lead screw drive unit (34) to fix the position of the brake adjuster (54), wherein the stop pawl device (70) is held by a separate plate (82) inserted into the brake caliper housing (42).

2. The electromechanical brake (10) according to claim 1, characterized in that, The plate (82) is held in the brake caliper housing (42) in a shape-fitting manner.

3. The electromechanical brake (10) according to claim 1 or 2, characterized in that, The stop claw device (70) has a pin (78) and a stop claw (74) rotatably supported on the pin (78), wherein the pin (78) is press-fitted into the plate (82).

4. The electromechanical brake (10) according to any one of the preceding claims, characterized in that, The brake caliper housing (42) has an opening (106) in the area of ​​the stop pawl device (70) to allow manual unlocking of the stop pawl device (70).

5. The electromechanical brake (10) according to any one of the preceding claims, characterized in that, The brake caliper housing (42) is composed of two housing parts (42a, 42b) connected to each other, wherein the housing part (42a) in which the parking brake device (62) is arranged is closed at one axial end.

6. The electromechanical brake (10) according to claim 5, characterized in that, The housing component (42a) is a deep-drawn part, and the parking brake device (62) is arranged in the housing component.

7. The electromechanical brake (10) according to any one of the preceding claims, characterized in that, The parking brake device (62) has a parking brake actuator (94) to actuate the stop pawl device (70), wherein the parking brake actuator (94) is fastened to the plate (82).

8. The electromechanical brake (10) according to any one of the preceding claims, characterized in that, The electrical connection line (98) between the control unit (102) that controls the electric motor (14) and the electric motor (14) is arranged on the plate (82).

9. The electromechanical brake (10) according to any one of the preceding claims, characterized in that, The plate (82) has multiple material cutouts (90).

10. The electromechanical brake (10) according to any one of the preceding claims, characterized in that, The sheet metal part is a stamped part.

11. A motor vehicle, said motor vehicle comprising an electromechanical brake (10) according to any one of the preceding claims.

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