Electromechanical brake having C-ring between brake carrier housing and brake caliper

Abstract

The invention relates to an electromechanical brake with a C-shaped ring between a brake carrier housing and a brake caliper for a motor vehicle, comprising a brake caliper (14) which at least partially surrounds a brake disc (18) and a brake carrier housing (22) in which an adjustment unit (30) driven by an electric motor (26) is arranged, a braking force (FB) can be applied to the brake piston (36) by means of the adjusting unit in such a way that the brake lining (38) can be brought into contact with the brake disc (18) for braking. According to the invention, the brake carrier housing (22) and the brake caliper (14) are designed as separate components, the brake carrier housing (22) and the brake caliper (14) each have a recess (50a, 50b) in the connection region (46), and a C-ring (54) is provided, which is arranged in each of the two recesses (50a, 50b) and prevents a relative movement of the brake caliper (14) with respect to the brake carrier housing (22) at least when a braking force (FB) is applied.

Description

Technical Field

[0001] The invention relates to an electromechanical brake for a motor vehicle and also to a motor vehicle having such an electromechanical brake. Background Art

[0002] Typically, the service brake utilizes brake fluid to press the brake piston and brake lining against the brake disc to brake the vehicle. In contrast, the parking brake is designed as an electromechanical brake. With the increasing electrification of components in motor vehicles, the service brake is also being designed as an electromechanical brake, eliminating brake fluid and the associated complex valve and piping systems. This electromechanical brake also significantly reduces maintenance costs.

[0003] EP 1 030 979 B1 discloses an electromechanical brake device for braking the wheels of a motor vehicle. The brake device comprises a brake support in which an electric motor is disposed. The electric motor drives a spindle drive unit, which causes a brake lining disposed on a brake caliper of the brake support to contact a brake disc, thereby braking the vehicle.

[0004] DE 10 2018 211 443 A1 discloses a pressure generating device for a vehicle brake system.

[0005] US2019 / 0003535 A1 relates to a clamp for a brake unit overlapping the outside of a clamping disc of a compartment, which has an electric motor driving a rotary shaft, a first worm gear meshing with a first main gear and a second worm gear meshing with a second main gear. Summary of the Invention

[0006] The object of the present invention is to provide an electromechanical brake for a motor vehicle which can be assembled more simply and more economically.

[0007] This object is achieved by an electromechanical brake for a motor vehicle having the subject matter of claim 1. Preferred embodiments can be derived from the dependent claims.

[0008] The present invention provides an electromechanical brake for a motor vehicle. The electromechanical brake includes a brake caliper and a brake support housing. The brake caliper at least partially surrounds a brake disc. An adjustment unit driven by an electric motor is disposed in the brake support housing. The adjustment unit can apply a braking force to a brake piston so that a brake lining abuts against the brake disc for braking. The brake support housing and the brake caliper are constructed as separate components. The brake support housing and the brake caliper each have grooves in the connecting region. A C-ring is provided, a portion of which is disposed in each of the two grooves and prevents relative movement of the brake caliper relative to the brake support housing, at least when a braking force is applied.

[0009] According to the present invention, the brake caliper and the brake support housing are formed from two separate parts. Consequently, lighter materials can be used for the brake support housing, which is also simpler to manufacture. The connection area is thus the region between the brake caliper and the brake support housing where they overlap radially and are fixed to one another. A C-ring is understood to be a ring that is not completely closed. In other words, the ring has two ends separated by a gap. Rings with different cross-sections can be used. However, the ring advantageously has a circular cross-section. The gap has the advantage that the ring can be compressed for assembly and thus has a smaller diameter. In the groove, the ring expands again, thus forming a permanent connection between the brake support housing and the brake caliper.

[0010] By connecting the brake caliper and the brake support housing using this C-ring, the brake caliper and the brake support housing can be connected to each other without tools. This allows for quick and easy assembly of the brake support housing and the C-ring. This makes it possible to assemble the electromechanical brake more economically.

[0011] In a preferred embodiment of the present invention, a positive fit is formed in the connection region between the brake support housing and the brake caliper to prevent rotation between them. A positive fit is understood to be a component part on the brake support housing and the brake caliper that is designed so that the brake support housing and the brake caliper interact with each other in a positive-locking manner. This allows the brake support housing to be fixed in a predetermined position relative to the brake caliper. The predetermined positioning of the positive fit allows a desired angle between the brake support housing and the brake caliper to be set. This makes it easy to adjust the rotation angle between the brake support housing and the brake caliper.

[0012] In another preferred embodiment of the present invention, the form-fitting features are configured as ridges on the brake support housing and on the brake caliper. Ridges are understood to be a plurality of axially extending teeth arranged on the outer diameter and inner diameter. The ridges of the brake support housing engage with the ridges of the brake caliper in a form-fitting manner. The advantage of configuring the ridges is that the brake support housing can be positioned at different angular orientations relative to the brake caliper. Thus, the orientation of the brake support housing relative to the brake caliper can be variably adjusted depending on the installation situation. Consequently, no separate components are required for each angular position between the brake caliper and the brake support housing. This saves on the manufacturing costs of different versions of the brake support housing and brake caliper. Consequently, only one type of brake caliper and brake support housing is required, which reduces manufacturing costs.

[0013] Preferably, the brake support housing and / or the brake caliper have at least one shoulder in the connection region, via which a force opposing the braking force can be absorbed. A force opposing the braking force is a force that acts in the opposite direction to the braking force. Such a force is not present during brake actuation. For example, a force opposing the braking force occurs when a brake lining that has adhered to the brake disc retracts from the disc after a prolonged period of inactivity. This causes the brake caliper and brake support housing to be pulled toward each other.

[0014] The shoulder can be designed with a variable diameter. The brake caliper and the brake support housing can support each other via this shoulder. Thus, forces opposing the braking force can be easily absorbed via this shoulder.

[0015] In an advantageous refinement, the recess in the brake support housing is defined on the side of the C-ring facing away from the brake caliper by a retaining ring press-fitted onto the brake support housing. The retaining ring and the C-ring cooperate to absorb forces opposing the braking force. Only the retaining ring needs to absorb the forces opposing the braking force. Because these forces are significantly smaller than the braking force, they can also be absorbed by the retaining ring. By defining the recess with the retaining ring, the complex recessing process required to form the recess is eliminated. Consequently, the brake support housing can be formed more simply and economically.

[0016] Advantageously, the recesses are designed in the brake caliper and brake support housing so that forces opposing the braking force can be absorbed via them and the C-ring. Advantageously, the recesses are designed symmetrically. This eliminates the need for a separate shoulder for absorbing forces opposing the braking force. This makes the electromechanical brake simpler and more economical to manufacture.

[0017] In another advantageous embodiment, the groove is formed by a forming step. Preferably, the forming step is a forging step. Thus, the groove is not formed by machining. Compared to manufacturing by machining, manufacturing by this forming step is significantly more cost-effective. This allows for more economical production of the electromechanical brake. Compared to manufacturing by machining, the forming step does not disrupt the fiber orientation in the workpiece, thereby improving the durability and load-bearing capacity of the workpiece.

[0018] Additionally, the present invention provides a motor vehicle having such an electromechanical brake. Such a motor vehicle has the advantages and properties described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Embodiments of the present invention are shown in the accompanying drawings and are further described in the following description.

[0020] Figure 1 shows a cross-sectional illustration of an electromechanical brake according to a first embodiment of the invention,

[0021] Figure 2 shows a cross-sectional illustration of an electromechanical brake according to a second embodiment of the invention,

[0022] Figure 3 A perspective view of an embodiment of a form-fit on a brake support housing is shown, and

[0023] Figure 4 A cross-sectional illustration of an electromechanical brake according to a third and a fourth embodiment of the invention is shown. DETAILED DESCRIPTION

[0024] exist Figure 1 is a cross-sectional view of an electromechanical brake 10 according to a first embodiment of the present invention. The electromechanical brake 10 includes a brake caliper 14, which partially surrounds a brake disc 18. The electromechanical brake 10 also includes a brake support housing 22, which is non-positively connected to the brake caliper 14. An electric motor 26, located in the brake support housing 22, drives an adjustment unit 30, which is located in the brake support housing 22. In the embodiment shown here, the adjustment unit 30 includes a ball screw drive 34, which rotates a brake lining 38 axially via a brake piston 36. The electric motor 26 is controlled by a control unit 42, which is also located in the brake support housing 22.

[0025] The brake support housing 22 and the brake caliper 14 are designed as separate components. Accordingly, the brake support housing 22 and the brake caliper 14 can be formed from different materials. In the connection region 46 between the brake caliper 14 and the brake support housing 22, both the brake caliper 14 and the brake support housing 22 are provided with diametrically opposed grooves 50a, 50b. A C-ring 54 is disposed in the grooves 50a, 50b, securing the brake support housing 22 and the brake caliper 14 in the assembled position. In the embodiment shown here, the C-ring 54 has an annular cross-section. The C-ring 54 is not completely closed, but rather has a gap (not shown). This gap allows the C-ring 54 to compress, thereby reducing its diameter. Upon reaching the groove 50b of the brake caliper, the ring 54 expands again, positioning itself in both grooves 50a, 50b.

[0026] exist Figure 1 In the embodiment shown, the braking force F acting on the brake caliper 14 can be received by the C-ring 54. B The brake caliper 14 is formed with a shoulder 58 against which the axial end 62 of the brake support housing 22 rests. B The opposite force F G Such a force F can occur, for example, if, after a prolonged standstill of the motor vehicle, the brake lining 38 adhering to the brake disc 18 actively recedes. G .

[0027] Figure 2 1 shows a cross-sectional view of an electromechanical brake 10 according to a second embodiment of the invention. Figure 2 Examples and Figure 1 The embodiment in FIG. 1 is different in that, in this embodiment, the shoulder 58 is formed by the brake support housing 22. The brake caliper 14 rests against the shoulder 58 so as to withstand the braking force F. B The opposite force F G Furthermore, a positive fit 66 is formed in the connecting region 46 between the brake caliper 14 and the brake support housing 22 , by which a rotation between the brake support housing 22 and the brake caliper 14 is prevented.

[0028] exist Figure 3 An embodiment of such a form-fitting portion 66 is shown in FIG. Figure 3A perspective view of the brake support housing 22 is shown. Here, the form-fitting portion 66 is configured as a ridge. Here, the teeth 70 of the ridge 66 extend in the axial direction of the brake support housing 22. A corresponding ridge 66 is also configured on the brake caliper 14. After the brake support housing 22 is mounted on the brake caliper 14, the two ridges 66 engage with each other, thereby preventing rotation. By configuring the form-fitting portion 66 as a ridge, different rotational conditions between the brake caliper 14 and the brake support housing 22 can be set for different installation positions.

[0029] Figure 4 The following diagram shows a cross-sectional view of an electromechanical brake 10 according to a third and fourth embodiment of the present invention. The third embodiment is shown on the left side of the electromechanical brake 10. In this embodiment, the shoulder 58 is not formed. Here, the recesses 50a, 50b of the brake caliper 14 and the brake support housing 22 are each designed in a semicircular manner, so that they together form an annular recess 50a, 50b for the C-ring 54. Therefore, the C-ring 54 not only absorbs the braking force F B , and bears the force F opposite to the braking force G Accordingly, the shoulder 58 can be omitted.

[0030] The embodiment shown on the right side of the electromechanical brake 10 differs from the preceding embodiments in that the recess 50a formed on the brake support housing 22 is delimited only on one side. Therefore, a gap 74 is provided between the brake caliper 14 and the brake support housing 22 on the side of the C-ring 54 axially facing away from the brake caliper 14. A retaining ring 78 is arranged in the gap 74 on the side of the C-ring 54 axially facing away from the brake caliper 14 on the brake support housing 22. In the embodiment shown here, the retaining ring 78 is press-fitted onto the brake support housing 22. The recess 50a of the brake support housing 22 is thus delimited on this side by the retaining ring 78. Accordingly, the retaining ring 78 is arranged so as to abut axially against the C-ring 54. Consequently, this arrangement allows the braking force F to be absorbed. B and the braking force F B The opposite force F G .

Claims

1. An electromechanical brake (10) for a motor vehicle, comprising a brake caliper (14) which at least partially surrounds a brake disc (18) and a brake support housing (22), wherein an adjustment unit (30) driven by an electric motor (26) is arranged in the brake support housing and by means of which the braking force (F B ) is applied to the brake piston (36) so that the brake lining (38) can abut against the brake disc (18) to perform braking, It is characterized in that The brake support housing (22) and the brake caliper (14) are constructed as separate components, wherein the brake support housing (22) and the brake caliper (14) are respectively constructed with grooves (50a, 50b) in the connection area (46), wherein a C-shaped ring (54) is provided, which is partially arranged in the two grooves (50a, 50b) and is at least when the braking force (F) is applied. B ) to prevent the relative movement of the brake caliper (14) relative to the brake support housing (22).

2. The electromechanical brake (10) according to claim 1, characterized in that In order to prevent rotation between the brake support housing (22) and the brake caliper (14), a positive fit (66) is formed in the connecting region (46) of the brake support housing (22) and the brake caliper (14).

3. The electromechanical brake (10) according to claim 1 or 2, characterized in that The form-fitting portion (66) is configured as a ridge-like protrusion on the brake support housing (22) and on the brake caliper (14).

4. The electromechanical brake (10) according to any one of the preceding claims, characterized in that The brake support housing (22) and / or the brake caliper (14) have at least one shoulder (58) in the connection region (46), by means of which the braking force (F B ) Opposing force (F G ).

5. The electromechanical brake (10) according to any one of the preceding claims, characterized in that The groove (50a) of the brake support housing (22) is delimited on the side of the C-ring (54) facing away from the brake caliper (14) by a retaining ring (78) pressed onto the brake support housing (22), which cooperates with the C-ring (54) so that the retaining ring (78) can withstand the braking force (F B ) Opposing force (F G ).

6. The electromechanical brake (10) according to any one of the preceding claims, characterized in that The groove (50b) in the brake caliper (14) and the brake support housing (22) is configured so that the braking force (F B ) Opposing force (F G ).

7. The electromechanical brake (10) according to any one of the preceding claims, characterized in that The grooves (50a, 50b) are formed by a molding step.

8. Motor vehicle comprising an electromechanical brake (10) according to any one of the preceding claims.

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