Electromechanical brake with C-shaped ring between brake calliper housing and brake calliper

Abstract

The invention relates to an electromechanical brake (10) for a motor vehicle. The electromechanical brake (10) comprises a brake calliper (14) which at least partially surrounds a brake disc (18), and a brake calliper housing (22) in which an adjusting unit (30) driven by an electric motor (26) is arranged, via which a braking force (F B ) can be applied to a brake piston (36), so that a brake pad (38) can be applied to the brake disc (18) for braking. The brake calliper housing (22) and the brake calliper (14) are designed as separate components, wherein the brake calliper housing (22) and the brake calliper (14) each form a groove (50a, 50b) in a connecting region (46), wherein a C-shaped ring (54) is provided, which is partially arranged in both grooves (50a, 50b) and at least when the braking force (F B ) blocks a relative movement of the brake calliper (14) to the brake calliper housing (22).

Description

[0001] The present invention relates to an electromechanical brake for a motor vehicle. Furthermore, the invention relates to a motor vehicle having such an electromechanical brake. State of the art

[0002] Typically, the service brake is a brake in which a brake piston, together with a brake pad, is pressed onto a brake disc via brake fluid to brake the vehicle. The parking brake, on the other hand, is designed as an electromechanical brake. With the increasing electrification of motor vehicle components, the service brake is also to be designed as an electromechanical brake, thus eliminating the need for brake fluid and the associated complex valve and line assembly. Such an electromechanical brake could also significantly reduce maintenance requirements.

[0003] EP 1 030 979 B1 discloses an electromechanical braking device for braking a motor vehicle wheel. The braking device comprises a brake caliper in which an electric motor is arranged. The electric motor drives a spindle drive unit, via which brake pads arranged on a brake caliper of the brake caliper can be applied to a brake disc for braking.

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

[0005] US 2019 / 0003535 A1 relates to a clamp for a brake unit for overlapping the outer side of a tensioning pulley of a cabin, comprising an electric motor driving a rotating shaft, a first endless screw geared to a first primary gear, and a second endless screw geared to a second primary gear.

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

[0007] The object is achieved by an electromechanical brake for a motor vehicle having the subject matter of patent claim 1. Preferred embodiments can be found in the dependent claims. Disclosure of the invention

[0008] The invention specifies an electromechanical brake for a motor vehicle. The electromechanical brake comprises a brake caliper which at least partially surrounds a brake disc, and a brake caliper housing in which an adjusting unit driven by an electric motor is arranged, via which a braking force can be applied to a brake piston so that a brake pad can be applied to the brake disc for braking. The brake caliper housing and the brake caliper are designed as separate components, with the brake caliper housing and the brake caliper each forming a groove in a connecting region. A C-shaped ring is provided which is partially arranged in both grooves and blocks relative movement from the brake caliper to the brake caliper housing, at least when the braking force is applied.

[0009] According to the invention, the brake caliper and the brake caliper housing are formed from two separate parts. Accordingly, a lighter material can be used for the brake caliper housing, which is also easier to manufacture. The connection area is therefore an area between the brake caliper and the brake caliper housing where they radially overlap and are fastened to one another. A C-shaped ring is understood to be a ring that is not completely closed. In other words, the ring has two ends that are spaced apart by a gap. Rings with different cross-sections can be used. Advantageously, however, the ring has a round cross-section. The gap has the advantage that the ring can be compressed for assembly and therefore has a smaller diameter.The ring expands again in the groove, forming a permanent connection between the brake calliper housing and the brake calliper.

[0010] By connecting the brake caliper to the brake caliper housing via such a C-shaped ring, they can be connected without tools. This allows for quick and easy assembly of the brake caliper housing with the C-shaped ring. This makes installation of the electromechanical brake more cost-effective.

[0011] In a preferred embodiment of the invention, form-locking elements are formed in the connection area of ​​the brake caliper housing and the brake caliper to block rotation between the brake caliper housing and the brake caliper. Form-locking elements are understood to be component elements on the brake caliper housing and the brake caliper which are designed such that they interact with one another in a form-fitting manner. This makes it possible to fix the brake caliper housing in a predetermined position relative to the brake caliper. By predefined positioning of the form-locking elements, a desired angle can be set between the brake caliper housing and the brake caliper. This makes it possible to easily set a rotation angle between the brake caliper housing and the brake caliper.

[0012] In a further preferred embodiment of the invention, the form-locking elements are designed as knurls on the brake caliper housing and on the brake caliper. A knurl is understood to be a plurality of teeth running in the axial direction, which are arranged on an outer and inner diameter. The knurl of the brake caliper housing engages positively with the knurl of the brake caliper. The design of a knurl has the advantage that the brake caliper housing can be arranged at different angular orientations to the brake caliper. The orientation of the brake caliper housing to the brake caliper can thus be variably adjusted depending on the installation situation. This eliminates the need for separate components for each angular position between the brake caliper and the brake caliper housing. This saves manufacturing costs for different versions of the brake caliper housing and the brake caliper.This means that only a single type of brake caliper and caliper housing is required, reducing manufacturing costs.

[0013] Preferably, the brake caliper housing and / or the brake caliper have at least one shoulder in the connecting area, via which a force opposing the braking force can be absorbed. A force opposing the braking force is a force whose direction is opposite to a direction of the braking force. Such a force does not occur during a braking maneuver. The force opposing the braking force occurs, for example, when a brake pad adhering to the brake disc is retracted after a prolonged period of inactivity. The brake caliper and the brake caliper housing are thereby pulled toward each other.

[0014] A shoulder can be designed in the form of a change in diameter. Such a shoulder allows the brake caliper and the brake caliper housing to support each other. This allows forces opposing the braking force to be easily absorbed.

[0015] In an advantageous further development, the groove of the brake caliper housing is delimited on a side of the C-shaped ring facing away from the brake caliper by a retaining ring pressed onto the brake caliper housing, which cooperates with the C-shaped ring in such a way that a force opposing the braking force can be absorbed via the retaining ring. Such a retaining ring would only have to absorb forces opposing the braking force. Since these forces are significantly lower than the braking forces, they can also be absorbed by the retaining ring. By delimiting the groove with a retaining ring, complex undercut manufacturing for forming the groove can be dispensed with. The brake caliper housing can therefore be designed in a simpler and more economical manner.

[0016] Advantageously, the groove in the brake caliper and the brake caliper housing is designed such that a force opposing the braking force can be absorbed via this groove and the C-shaped ring. Advantageously, the groove is symmetrical. This eliminates the need for a separate shoulder to absorb a force opposing the braking force. This allows for simpler and more cost-effective production of such an electromechanical brake.

[0017] In a further advantageous embodiment, the groove is formed by a forming step. Preferably, the forming step is a forging step. The groove is thus not produced by machining. In contrast to machining, production by such a forming step is significantly lower. Such an electromechanical brake can thus be manufactured more economically. Unlike machining, the forming step does not disrupt fiber orientation in the workpiece. The durability and load-bearing capacity of the workpiece are thus improved.

[0018] The invention also provides a motor vehicle having such an electromechanical brake. Such a motor vehicle has the advantages and properties described above.

[0019] Embodiments of the invention are illustrated in the drawing and explained in more detail in the following description. It shows: Fig. 1 sectional view of an electromechanical brake according to a first embodiment of the invention, Fig. 2 Sectional view of the electromechanical brake according to a second embodiment of the invention, Fig. 3 Perspective view of an embodiment of form-locking elements on the brake caliper housing, and Fig. 4 Sectional view of the electromechanical brake according to a third and fourth embodiment of the invention.

[0020] In Fig. 1 is a sectional view of an electromechanical brake 10 according to a first exemplary embodiment of the invention. The electromechanical brake 10 comprises a brake caliper 14, which partially surrounds a brake disc 18. Furthermore, the electromechanical brake 10 comprises a brake caliper housing 22, which is non-positively connected to the brake caliper 14. An electric motor 26 arranged on the brake caliper housing 22 drives an adjustment unit 30 arranged in the brake caliper housing 22. In the exemplary embodiment shown here, the adjustment unit 30 comprises a ball screw drive 34, via which a brake pad 38 is axially movable by means of a brake piston 36. The electric motor 26 is controlled by a control unit 42, which is also arranged on the brake caliper housing 22.

[0021] The brake caliper housing 22 and the brake caliper 14 are formed as separate parts. Accordingly, the brake caliper housing 22 and the brake caliper 14 can be formed from different materials. In a connecting region 46 between the brake caliper 14 and the brake caliper housing 22, both the brake caliper 14 and the brake caliper housing 22 form a radially opposing groove 50a, 50b. A C-shaped ring 54 is arranged in this groove 50a, 50b and fixes the brake caliper housing 22 and the brake caliper 14 in an assembled position. In the exemplary embodiment shown here, the C-shaped ring 54 has an annular cross-section. The C-shaped ring 54 is not completely closed, but has a gap (not shown). The gap makes it possible to compress the C-shaped ring 54, so that a diameter of the ring 54 is reduced.When the groove 50b of the brake caliper is reached, the ring 54 expands again so that it is positioned in both grooves 50a, 50b.

[0022] In the Fig. 1, it is possible via the C-shaped ring 54 to apply a braking force F acting on the brake caliper 14 B The brake caliper 14 forms a shoulder 58 against which an axial end 62 of the brake caliper housing 22 rests. Via this shoulder 58, the braking force F B opposing forces F G Such forces F G can occur, for example, if after the motor vehicle has been stationary for a long time, the brake pad 38 adhering to the brake disc 18 is actively retracted.

[0023] Fig. Figure 2 shows a sectional view of the electromechanical brake 10 according to a second embodiment of the invention. The embodiment according to Fig. 2 differs from the embodiment in Fig. 1, in this embodiment, a shoulder 58 is formed through the brake caliper housing 22. The brake caliper 14 rests against this shoulder 58, so that the braking force F B opposing forces F G can be accommodated. In addition, form-locking elements 66 are formed in the connecting region 46 between the brake caliper 14 and the brake caliper housing 22, by means of which rotation between the brake caliper housing 22 and the brake caliper 14 is blocked.

[0024] An embodiment of such a form-locking element 66 is shown in Fig. 3. This figure shows a perspective view of the brake caliper housing 22. The positive locking element 66 is designed in the form of a knurl. Teeth 70 of the knurl 66 run in the axial direction of the brake caliper housing 22. A corresponding knurl 66 is also formed on the brake caliper 14. After the brake caliper housing 22 is mounted on the brake caliper 14, both knurls 66 engage with each other, thus preventing rotation. By designing the positive locking elements 66 as a knurl, it is possible to set a different rotation between the brake caliper 14 and the brake caliper housing 22 for different installation positions.

[0025] Fig.Figure 4 shows a sectional view of the electromechanical brake 10 according to a third and fourth embodiment of the invention. The third embodiment is shown on a left side of the electromechanical brake 10. In this embodiment, no shoulder 58 is formed. The groove 50a, 50b of the brake caliper 14 and the brake caliper housing 22 is each semicircular, so that together they form an annular groove 50a, 50b for the C-shaped ring 54. Thus, not only a braking force F B , but also a force F opposite to the braking force G Accordingly, paragraph 58 can be omitted.

[0026] The embodiment shown on the right side of the electromechanical brake 10 differs from the previous embodiments in that the groove 50a formed on the brake caliper housing 22 is limited on only one side. On a side of the C-shaped ring 54 axially facing away from the brake caliper 14, a gap 74 is thus provided between the brake caliper 14 and the brake caliper housing 22. In this gap 74, on a side of the C-shaped ring 54 axially facing away from the brake caliper 14, a retaining ring 78 is applied to the brake caliper housing 22. In the embodiment shown here, the retaining ring 78 is pressed onto the brake caliper housing 22. The groove 50a of the brake caliper housing 22 is thus limited on this side by the retaining ring 78. The retaining ring 78 is arranged axially adjacent to the C-shaped ring 54. By means of such an arrangement, both braking forces F B as well as the braking forces F Bopposing forces F G recordable. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 1 030 979 B1

[0003] DE 10 2018 211 443 A1

[0004] US 2019 / 0003535 A1

[0005]

Claims

[1] Electromechanical brake (10) for a motor vehicle, comprising a brake calliper (14) which at least partially surrounds a brake disc (18) and a brake calliper housing (22) in which an adjusting unit (30) driven by an electric motor (26) is arranged, via which a braking force (F B ) can be applied to a brake piston (36) so that a brake pad (38) can be applied to the brake disc (18) for braking, characterized by that the brake calliper housing (22) and the brake calliper (14) are designed as separate components, wherein the brake calliper housing (22) and the brake calliper (14) each form a groove (50a, 50b) in a connecting region (46), wherein a C-shaped ring (54) is provided, which is partially arranged in both grooves (50a, 50b) and at least when the braking force (F B ) blocks a relative movement of the brake calliper (14) to the brake calliper housing (22). [2] Electromechanical brake (10) according to claim 1, characterized by in that form-locking elements (66) are formed in the connecting region (46) of the brake calliper housing (22) and the brake calliper (14) to block rotation between the brake calliper housing (22) and the brake calliper (14). [3] Electromechanical brake (10) according to claim 1 or 2, characterized by that the form-locking elements (66) are designed as knurls on the brake calliper housing (22) and on the brake calliper (14). [4] Electromechanical brake (10) according to one of the preceding claims, characterized by that the brake calliper housing (22) and / or the brake calliper (14) has at least one shoulder (58) in the connecting region (46), via which a braking force (F B ) opposing force (F G ) can be recorded. [5] Electromechanical brake (10) according to one of the preceding claims, characterized bythat the groove (50a) of the brake calliper housing (22) is delimited on a side of the C-shaped ring (54) facing away from the brake calliper (14) by a retaining ring (78) pressed onto the brake calliper housing (22), which cooperates with the C-shaped ring (54) in such a way that a braking force (F B ) opposing force (F G ) can be received via the retaining ring (78). [6] Electromechanical brake (10) according to one of the preceding claims, characterized by that the groove (50b) in the brake calliper (14) and the brake calliper housing (22) is designed in such a way that a braking force (F B ) opposing force (F G ) can be recorded. [7] Electromechanical brake (10) according to one of the preceding claims, characterized by that the groove (50a, 50b) is formed by a forming step. [8] Motor vehicle comprising an electromechanical brake (10) according to one of the preceding claims.

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