Seal assembly for brake piston assembly

Abstract

The invention relates to a seal assembly for a brake piston assembly. The sealing assembly (1) has a circumferential fastening part (10) for fastening the sealing assembly in the brake caliper housing (105) and a sealing part (30) which can be axially stretched and / or compressed. The sealing portion has: a fastener (31) axially spaced apart from the fixed portion (10) by a first distance (a1) and arranged closer to an axial end (131) of the brake piston (130) than the fixed portion (10); and a first connecting portion (32) which is axially spaced apart from the fastener (31) by a second distance (a2) less than the first distance (a1), or which is not axially spaced apart from the fastener (31), by means of which the sealing portion (30) is connected in a circumferential manner to the fixing portion (10).

Description

Field of the Invention

[0001] The present invention relates to a sealing assembly for a brake piston assembly of an electromechanical motor vehicle disc brake. The present invention also relates to a brake piston assembly having such a sealing assembly and an electromechanical motor vehicle disc brake having the above components. Background Art

[0002] This type of sealing assembly is used in an associated brake piston assembly to protect a brake piston that is axially movably received in a brake piston receiver of a brake caliper housing, and also to protect the brake piston receiver from penetrating contamination. An electromechanical motor vehicle disc brake typically includes such a brake piston assembly and a rotation-translation mechanism in the region of the brake piston and in the region of the brake piston receiver or within the brake piston. Such a rotation-translation mechanism is broadly embodied as a spindle drive. Thus, in the case where the disc brake or the brake piston assembly includes a plurality of rotation-translation mechanisms, the associated sealing assembly is also used to protect one or more rotation-translation mechanisms from dirt and dust. In addition, such a sealing assembly performs a guiding function for guiding the brake piston, and in the case where a lubricant is used to lubricate the brake piston guide and the rotation-translation mechanism, they prevent or limit the leakage of the corresponding lubricant.

[0003] This type of sealing assembly is known in the prior art. For example, DE102022119398A1 discloses a corresponding assembly. Summary of the Invention

[0004] The object of the present invention is to provide a sealing assembly for a brake piston assembly of an electromechanical motor vehicle disc brake, which results in simplified assembly and more reliable positioning in the brake piston assembly, and which reliably prevents the penetration of dirt and dust and optimally guides the brake piston.

[0005] The above object is achieved by the sealing assembly according to the present invention, the brake piston assembly according to the present invention, and the electromechanical motor vehicle disc brake according to the present invention.

[0006] When referring to the brake piston assembly and its components or the electromechanical motor vehicle disc brake and its components (such as a brake pad assembly) in the context of this sealing assembly, this is intended to clearly define the different elements of this sealing assembly and to demonstrate the advantages of these elements of this sealing assembly over the prior art. In addition, when referring to the electromechanical motor vehicle disc brake in the context of the brake piston assembly, this is likewise intended to clearly define the different elements of the brake piston assembly and to demonstrate the advantages of the present invention over the prior art.

[0007] The sealing assembly according to the invention is intended for a brake piston assembly of an electromechanical motor vehicle disc brake. The brake piston assembly includes a brake caliper housing and a brake piston which is axially movable in a brake piston receiver of the brake caliper housing and has an axial end which projects from the brake caliper housing and is capable of applying a driving force in the axial direction to a brake lining assembly which is present and associated with the electromechanical motor vehicle disc brake in a state where the brake piston assembly is installed in the electromechanical motor vehicle disc brake. The sealing assembly has a surrounding fixing part for fixing the sealing assembly in the brake caliper housing, and the sealing assembly has a rotationally symmetric configuration with respect to a symmetry axis. To allow axial movement of the brake piston relative to the brake caliper housing, the sealing assembly further has a sealing part. The sealing part is axially stretchable or compressible, or both axially stretchable and axially compressible. The sealing part includes a fastening member which is axially spaced apart from the fixing part by a first distance a1 and is arranged closer to the axial end of the brake piston than the fixing part, and the fastening member is capable of being fastened to the brake piston in a surrounding and sealing manner. Preferably, the sealing part is fastened to the brake piston in a surrounding and sealing manner by means of an annular groove included in the brake piston. The fastening member is received in the annular groove. The sealing part further has a first connecting part which is axially spaced apart from the fastening member by a second distance a2 which is less than the first distance a1, or the first connecting part is not axially spaced apart from the fastening member, and the sealing part is connected to the fixing part in a surrounding manner by means of the first connecting part. The sealing assembly further has a surrounding sealing lip which is connected to the fixing part in a surrounding manner by means of a second connecting part. The second connecting part is axially spaced apart from the fastening member by a third distance a3 which is greater than the second distance a2, and is arranged further away from the axial end of the brake piston than the fastening member. The sealing lip extends from the second connecting part up to a contact part which is axially spaced apart from the fastening member by a fourth distance a4 which is less than the third distance a3. At least in an uninstalled state of the sealing assembly, the sealing lip has a profile which is inclined with respect to the symmetry axis such that the contact part is at a first radial distance r1 from the symmetry axis, and the second connecting part is at a second radial distance r2 from the symmetry axis which is greater than the first radial distance r1. Thus, in a sectional view, the sealing lip forms an elongated profile, the contact part of which is arranged in an inclined manner towards the symmetry axis and towards the circumferential surface of the brake piston in an installed state. This type of sealing assembly allows for simplified installation and more reliable positioning. In addition, it reliably prevents the penetration of dirt and dust and provides optimal guidance of the brake piston.

[0008] The expressions "axial" or "in the axial direction" refer to being aligned with the longitudinal axis of the brake piston or aligned to the longitudinal axis of the brake piston receiver in the state where the sealing assembly is installed in the corresponding brake piston assembly. That is to say, "in the axial direction" or "axial" means parallel to or extending along the longitudinal axis. The axis of symmetry coincides with or is offset parallel to the longitudinal axis.

[0009] The parts or elements involved in the axial distance indicators a1, a2, a3, and a4 may each have a range in the axial direction. In this case, the corresponding distance reference points refer to the centers of the corresponding ranges.

[0010] In the state where the sealing assembly is installed in the brake piston assembly, the contact part preferably abuts against the piston circumferential surface of the brake piston and applies a first contact force F1 to the piston circumferential surface, where the second connecting part does not abut against the piston circumferential surface or applies a contact force F2 lower than the first contact force F1 to the piston circumferential surface.

[0011] In a preferred embodiment, the sealing lip is made of an elastically deformable elastomer, and the first contact force is generated only based on the deformation of the sealing lip, which deformation occurs in the state where the sealing assembly is installed in the brake piston assembly. This is particularly helpful for simplifying the installation because during installation, only the elastic force generated by the elasticity of the material has to be overcome at the brake piston. This is particularly important for avoiding damage during installation, especially in the case of a brake piston assembly representing a safety-related component.

[0012] Preferably, the sealing assembly is mainly composed of an elastically deformable elastomer. Especially in the case of this type of material, the advantages described in the previous paragraphs are also obtained.

[0013] Preferably, the fixing part has a surrounding metal reinforcement. Preferably, the surrounding metal reinforcement is internal. This means that the metal reinforcement is surrounded by the material of the sealing assembly. In the case of a sealing assembly composed of or including an elastically deformable elastomer, preferably, the internal metal reinforcement can be surrounded by a deformable elastomer.

[0014] Preferably, the surrounding metal reinforcement includes a surrounding metal insert, which is angular or S-shaped when considering the profile. This type of profile is obtained in a cross-section that coincides with the axis of symmetry, or in other words, in the half-section of the sealing assembly. The angular or S-shaped surrounding metal insert helps to simplify the installation because as a result, the sealing assembly has increased stiffness in the area of the fixing part. Therefore, the fixing part can be driven more effectively into the hole part and can thus also be held precisely and reliably in the hole part or the brake piston assembly.

[0015] Preferably, the sealing part includes a bellows which has folding parts, and each folding part has an elongated part and a bent part, and the bent parts connect two adjacent elongated parts arranged adjacent to each other. The elongated parts are arranged substantially parallel to the symmetry axis. Alternatively, the elongated parts can also be arranged substantially transversely to the symmetry axis.

[0016] Preferably, the fixing part, the sealing part and the sealing lip are integrally connected to each other. Alternatively or additionally, the fastener, the first connecting part and the fixing part are integrally connected to each other. As an alternative or supplement to the above connection, the contact part, the second connecting part and the fixing part are integrally connected to each other. When all the elements mentioned in this paragraph of the present invention are integrally connected to each other, there is an advantage of simplified installation, because in this case the sealing assembly can be installed in one working step.

[0017] The brake piston assembly for an electromechanical motor vehicle disc brake according to the present invention includes a sealing assembly according to the characteristics or features described above or a combination of the features of the sealing assembly described above. It also has the corresponding stated advantages. The brake piston assembly includes a brake caliper housing and a brake piston which can axially move in a brake piston receiver of the brake caliper housing and has an axial end which protrudes from the brake caliper housing and can apply a driving force in the axial direction to a brake lining assembly which exists and is associated with the electromechanical motor vehicle disc brake in a state where the brake piston assembly is installed in the electromechanical motor vehicle disc brake.

[0018] The brake piston receiver is implemented as a hole having a first hole diameter Di1, wherein in a region where the brake piston protrudes from the brake caliper housing, the hole has a hole part which has a second hole diameter Di2, Di2A, Di2B larger than the first hole diameter Di1, and the fixing part has a clamping part which has a first outer diameter Da1, Da1A, Da1B, and the sizes of the second hole diameter Di2, Di2A, Di2B and the sizes of the first outer diameter Da1, Da1A, Da1B are in corresponding ratios to each other, so that the fixing part is axially and radially fixed in the region of the hole part. Alternatively or additionally, the hole part and the clamping part can be in corresponding operative connection with each other, so that the fixing part is axially and radially fixed in the region of the hole part.

[0019] Preferably, the hole wall forming the second hole diameter Di2, Di2A, Di2B of the hole part is provided with a retaining groove which is pressed into the side surface of the clamping part forming the first outer diameter Da1, Da1A, Da1B. As an alternative or supplement to the retaining groove, the above hole wall can be provided with a retaining boss which is pressed into the side surface of the clamping part. These profiles contribute to the reliable positioning of the sealing assembly in the brake piston assembly.

[0020] Preferably, the fixing part has an adjacent flange that protrudes radially outwards and abuts against the brake caliper housing, in particular against the outer side of the brake caliper housing, by means of an adjacent side oriented towards the clamping part. Such an adjacent flange helps to simplify the installation because the adjacent flange forms a stop during the installation process. It also helps to ensure the positioning of the sealing assembly in the brake piston assembly and provides additional protection against the penetration of dirt and dust.

[0021] The electromechanical motor vehicle disc brake according to the invention comprises a brake pad assembly and a brake piston assembly according to the combination of the characteristics or features described above or according to the features of the brake piston assembly described above. It also has the advantages stated accordingly. Thus, the brake piston assembly also has a sealing assembly according to the above-mentioned characteristics and features. Therefore, the brake piston assembly also includes a brake caliper housing and a brake piston that can move axially in the brake piston receiver of the brake caliper housing and has an axial end protruding from the brake caliper housing and can apply a driving force in the axial direction to the brake pad assembly. Description of the Drawings

[0022] Further features, advantages and possible uses of the present invention will become apparent from the following description of exemplary embodiments and schematic Figures 1 to 5 illustrations. For the sake of clarity, not all elements shown in the figures have reference numerals in all cases. However, the corresponding elements or areas are at least designated in another figure, and their importance can be gathered there. In addition, the same reference numerals can represent the same or similar objects in the figures.

[0023] Figure 1 An embodiment of the brake piston assembly according to the present invention is shown.

[0024] Figure 2 A first exemplary embodiment of the sealing assembly according to the present invention in the installed state is shown in cross-section.

[0025] Figure 3 The sealing assembly of the first exemplary embodiment is shown.

[0026] Figure 4 A first exemplary embodiment of the sealing assembly according to the present invention is shown in cross-section.

[0027] Figure 5 A second exemplary embodiment of the sealing assembly according to the present invention in the installed state is shown in cross-section. Detailed Description

[0028] Figure 1Shows the overall structure of the brake piston assembly 100 according to the present invention. Here, the sealing assembly 1 is shown only in a relatively small scale and is therefore described in more detail with reference to other drawings ( Figures 2 to 5 ). The brake piston assembly 100 includes a brake caliper housing 105, and only a part of the brake caliper housing 105 is shown here, in particular the area of the brake piston receiver 106. The brake piston receiver 106 is a cylindrical hole in which a brake piston 130 is received in a manner that it can move axially in the axial direction 101. That is, the brake piston can move in the direction of the symmetry axis 5. In a state where the brake piston assembly is installed in a disc brake, on the side of the brake piston receiver 106 facing the brake lining assembly and the brake disc, an axial end 131 of the brake piston 130 protrudes from the brake caliper housing 105 by a certain amount. This axial end 131 of the brake piston 130 has a closed design, and therefore the axial end 131 of the brake piston 130 can be driven against the brake lining assembly by the actuation of the disc brake and can generate a braking effect (the disc brake, the brake lining assembly, and the brake disc are not shown). On the side of the brake piston 130 opposite to the axial end 131 in the axial direction, the piston has an open design, and therefore it is possible to install a rotation-translation mechanism or a spindle drive within the brake piston 130. The open end of the brake piston 130 is thus oriented towards the electromechanical drive.

[0029] The rotationally symmetric sealing assembly 1 is installed in the area of the axial end 131. Here, it is in the form of two parts. The sealing part 30 is fastened in the annular groove 133 of the brake piston 130 by means of a surrounding thick-edge type fastener 31. The fixing part 10 is pressed into the hole part 115 of the brake piston receiver 106. Since the drawings are schematic illustrations, the components of the sealing assembly 1 are not always shown in the form they are actually adopted. Therefore, any overlap of materials that may exist in the illustration is only required by the drawing and does not actually occur in this form.

[0030] In Figure 2In the first embodiment of the sealing assembly 1 and also of the brake piston assembly 100 shown, the brake piston 130 is likewise received so as to be axially movable in the brake piston receiver 106 of the brake caliper housing 105. The circumferential thick-edge type fastener 31 of the rotationally symmetric sealing assembly 1 is received in the annular groove 133 at the axial end 131. There is a bellows 35 which adjoins the fastener 31 continuously in the axial direction 101. The folds 36 of the bellows 35 are arranged transversely to the axis of symmetry 5. The bellows 35 and the fastener 31 are components of the sealing part 30. Immediately following in the axial direction 101, the fixing part 10 adjoins the bellows 35 by means of a first connecting part 32 which extends radially outwards from the fixing part 10 and thus forms an adjoining flange, and the fixing part 10 extends into the hole part 115 of the brake caliper housing 105 in the axial direction 101 by means of a clamping part 15. The hole part 115 has an inner diameter Di2. The inner diameter Di2, which is greater than the inner diameter Di1 of the brake piston receiver, is formed by the hole wall 116 and the annular offset surface 118. The hole wall 116 has a circumferential serrated holding groove 117 which ensures a firm seating of the fixing part 10 in the hole part 115. The axial extent of the hole part 115 is much greater than the axial extent of the clamping part 15, so that a gap remains between the end face 17 of the clamping part 15 and the offset surface 118 of the hole part 115. The outer diameter Da1 of the clamping part 15 abuts against the inner diameter Di2 of the hole part 115. This contributes to good positioning and sealing of the sealing assembly. On the one hand, the adjoining flange 18 forms a positioning aid and an additional position fixing means during the installation of the sealing assembly 1, since the flange abuts against the outer side 119 of the brake caliper housing 105 by means of the adjoining side 19. On the other hand, the adjoining flange 18 forms an additional sealing position.

[0031] In the radially inner region of the clamping part 15, i.e., in the region closer to the brake piston 130, the sealing part 30 includes a sealing lip 40 that adjoins the clamping part 15 by means of a second connecting part 41. Starting from the second connecting part 41, the sealing lip 40 extends longitudinally away from the end face 17 towards the contact part 42, and the contact part 42 abuts against the piston circumferential surface 132 in a surrounding and sealing manner. Starting from the second connecting part 41, the elongate sealing lip 40 is further inclined towards the contact part 42 such that the contact part 42 is closer to the symmetry axis 5 or closer to the piston circumferential surface 132 in the radial direction than the second connecting part 41. The sealing lip 40 acts like an elastic lever arm (which is mounted on the second connecting part 41 and elastically abuts against the piston circumferential surface 132), forms a seal between the contact part 42 and the piston circumferential surface 132, and also guides the brake piston 130. The elasticity of the sealing lip 40 is generated by the elastically deformable elastomer that manufactures the sealing assembly 1. In addition to the S-shaped metal insert 12 cast or vulcanized into the fixed part 10, the sealing assembly 1 is integrally manufactured from an elastically deformable elastomer. The S-shaped metal insert 12 has a central part that rests in the clamping part 15 in a sleeve shape. Starting from the sleeve-shaped central part of the metal insert, branches extending radially inwards extend to the second connecting part 41, and branches extending radially outwards extend into the adjoining flange 18. The metal insert 12 constructed in this way imparts stability to the sealing assembly 1 in a special way, such that the sealing assembly 1 can be installed in a particularly effective manner and also provides reliable positioning.

[0032] In Figure 3 FIG. fully shows the sealing assembly 1 according to the first exemplary embodiment, and it can be seen that the sealing assembly 1 has a rotationally symmetric and integral configuration.

[0033] The construction of the first exemplary embodiment of the sealing assembly 1 is shown in Figure 4The middle is shown in an enlarged scale in a half-section. The sealing assembly 1 has a surrounding fixing part 10 for fixing the sealing assembly 1 in the brake caliper housing 105, and the sealing assembly 1 has a configuration that is rotationally symmetric with respect to the symmetry axis 5. To allow the brake piston 130 to axially move relative to the brake caliper housing 105, the sealing assembly 1 further includes a sealing part 30. The sealing part 30 can be axially stretched or compressed, or both axially stretched and axially compressed. The sealing part 30 includes a fastener 31 that is axially spaced from the fixing part 10 by a first distance a1 and is arranged closer to the axial end 131 of the brake piston 130 than the fixing part 10, and the fastener can be fastened in the annular groove 133 of the brake piston 130 in a surrounding and sealing manner. The sealing part 30 also has a first connecting part 32 that is axially spaced from the fastener 31 by a second distance a2 that is less than the first distance a1, and the sealing part 30 is connected to the fixing part 10 by means of the first connecting part 32. The sealing assembly 1 also has a sealing lip 40 that is connected to the fixing part 10 by means of a second connecting part 41. The second connecting part 41 is axially spaced from the fastener 31 by a third distance a3 that is greater than the second distance a2, and is arranged farther from the axial end 131 of the brake piston 130 than the fastener 31. The sealing lip 40 extends from the second connecting part 41 to a contact part 42 that is axially spaced from the fastener 31 by a fourth distance a4 that is less than the third distance a3. The sealing lip 40 has a profile that is inclined with respect to the symmetry axis 5 such that the contact part 42 is at a first radial distance r1 from the symmetry axis 5, and the second connecting part 41 is at a second radial distance r2 from the symmetry axis 5 that is greater than the first radial distance r1. The sealing part 30 includes a bellows 35 that has folding parts 36, and the folding parts 36 have elongated parts 37 and curved parts 38, and the curved parts 38 connect two adjacent elongated parts 37 that are arranged. The elongated parts 37 are arranged substantially transversely to the symmetry axis 5. However, alternatively, the elongated parts 37 can also be arranged substantially parallel to the symmetry axis 5.

[0034] Figure 5Shows a second embodiment of the sealing assembly 1 and the brake piston assembly 100 according to the present invention. The essential difference from the above-mentioned first exemplary embodiment is that, without considering the metal reinforcement 11, the sealing assembly 1 is a two-part design, and the hole part 115 has a two-stage configuration, that is, having two diameters Di2A and Di2B. The hole stage with diameter Di2B is machined deeper into the brake caliper housing 105 than the hole stage with diameter Di2A. Di2B is greater than Di2A, and both Di2A and Di2B are greater than the diameter Di1 of the brake piston receiver 106. The fixing part 10 including the clamping part 15, the second connecting part 41 and the sealing lip 40 is pressed into the hole stage with diameter Di2A. The clamping part 15 abuts against Di2A by means of the outer diameter Da1A. Except for the abutting flange not included in the fixing part 10 of the second exemplary embodiment, the structure of the fixing part 10 is equivalent to that of the first exemplary embodiment.

[0035] The sealing part 30 of the second exemplary embodiment is connected to the other part of the fixing part via the first connecting part 32, and the other part is received in the hole stage with diameter Di2B by means of the outer diameter Da1B. Here, the elongated part 37 of the bellows 35 is arranged substantially parallel to the symmetry axis 5, but can also be configured to be arranged transversely to the symmetry axis 5. Here, the sealing part 30 is also fastened in the annular groove 133 by means of the fastener 31, and the annular groove is machined at the axial end 131 of the brake piston 130.

Claims

1. A sealing assembly (1) for a brake piston assembly (100) of an electromechanical motor vehicle disc brake, wherein, the brake piston assembly (100) includes a brake caliper housing (105) and a brake piston (130) which is axially movable in a brake piston receiver (106) of the brake caliper housing (105) and has an axial end (131) that projects from the brake caliper housing (105) and is capable of applying a driving force in the axial direction (101) to a brake lining assembly which is present and associated with the electromechanical motor vehicle disc brake when the brake piston assembly (100) is installed in the electromechanical motor vehicle disc brake; wherein the sealing assembly (1) has a rotationally symmetric configuration with respect to a symmetry axis (5) and has a surrounding fixing part (10) for fixing the sealing assembly (1) in the brake caliper housing (105); wherein, in order to allow the brake piston (130) to axially move relative to the brake caliper housing (105), the sealing assembly (1) has a sealing part (30) that can be axially stretched and / or compressed, and the sealing part includes: a fastening member (31) which is axially spaced from the fixing part (10) by a first distance (a1) and is arranged closer to the axial end (131) of the brake piston (130) than the fixing part (10), and the fastening member can be fastened to the brake piston (130) in a surrounding and sealing manner, specifically by means of an annular groove (133) included in the brake piston (130); and a first connecting part (32) which is axially spaced from the fastening member (31) by a second distance (a2) less than the first distance (a1), or the first connecting part is not axially spaced from the fastening member (31), and the sealing part (30) is connected to the fixing part (10) in a surrounding manner by means of the first connecting part; wherein the sealing assembly (1) has a surrounding sealing lip (40) which is connected to the fixing part (10) in a surrounding manner by means of a second connecting part (41), the second connecting part is axially spaced from the fastening member (31) by a third distance (a3) greater than the second distance (a2), and is arranged farther from the axial end (131) of the brake piston (130) than the fastening member (31), and Wherein, the sealing lip (40) extends from the second connecting portion (41) to a contact portion (42) that is axially spaced from the fastener (31) by a fourth distance (a4) less than the third distance (a3). At least in the uninstalled state of the sealing assembly (1), the sealing lip (40) has a profile that is inclined with respect to the symmetry axis (5), such that the contact portion (42) is at a first radial distance (r1) from the symmetry axis (5), and the second connecting portion (41) is at a second radial distance (r2) from the symmetry axis (5) that is greater than the first radial distance (r1).

2. The sealing assembly (1) according to claim 1, wherein, in a state where the sealing assembly (1) is installed in the brake piston assembly (100), the contact portion (42) abuts against the piston circumferential surface (132) of the brake piston (130) and exerts a first contact force on the piston circumferential surface, and the second connecting portion (41) does not abut against the piston circumferential surface (132) or exerts a contact force lower than the first contact force on the piston circumferential surface (132).

3. The sealing assembly (1) according to claim 2, wherein, the sealing lip (40) is made of an elastically deformable elastomer, and the first contact force is generated only based on the deformation of the sealing lip (40), which deformation occurs in a state where the sealing assembly (1) is installed in the brake piston assembly (100).

4. The sealing assembly (1) according to one of the preceding claims, wherein, the sealing assembly (1) is mainly composed of an elastically deformable elastomer.

5. The sealing assembly (1) according to one of the preceding claims, wherein, the fixing portion (10) has a surrounding metal reinforcement (11), in particular an internal metal reinforcement (11).

6. The sealing assembly (1) according to claim 5, wherein, the surrounding metal reinforcement (11) includes a surrounding metal insert (12), which is angular or S-shaped when considered in terms of its profile.

7. The sealing assembly (1) according to one of the preceding claims, wherein, the sealing portion (30) includes a bellows (35) that has folding portions (36), and each folding portion has an elongated portion (37) and a bent portion (38). The bent portions connect two adjacent elongated portions (37) arranged adjacent to each other. Wherein, the elongated portions (37) are arranged substantially parallel to the symmetry axis (5), or wherein the elongated portions (37) are arranged substantially transverse to the symmetry axis (5).

8. The sealing assembly (1) according to one of the preceding claims, wherein, The fixed part (10), the sealing part (30) and the sealing lip (40) are integrally connected to each other, and / or wherein the fastening member (31), the first connecting part (32) and the fixed part (10) are integrally connected to each other, and / or wherein the contact part (42), the second connecting part (41) and the fixed part (10) are integrally connected to each other.

9. A brake piston assembly (100) for an electromechanical motor vehicle disc brake, the brake piston assembly having a sealing assembly (1) according to one of claims 1 to 8, wherein, the brake piston assembly (100) includes a brake caliper housing (105) and a brake piston (130) which can axially move in a brake piston receiver (106) of the brake caliper housing (105) and has an axial end (131) which protrudes from the brake caliper housing (105) and can apply a driving force in the axial direction (101) to a brake lining assembly which is present and associated with the electromechanical motor vehicle disc brake when the brake piston assembly (100) is installed in the electromechanical motor vehicle disc brake.

10. The brake piston assembly (100) according to claim 9, wherein, the brake piston receiver (106) is implemented as a hole having a first hole diameter (Di1), wherein in the region where the brake piston (130) protrudes from the brake caliper housing (105), the hole has a hole portion (115) which has a second hole diameter (Di2, Di2A, Di2B) larger than the first hole diameter (Di1), wherein the fixed part (10) has a clamping part (15) which has a first outer diameter (Da1, Da1A, Da1B), wherein the size of the second hole diameter (Di2, Di2A, Di2B) and the size of the first outer diameter (Da1, Da1A, Da1B) are in a corresponding ratio to each other and / or the hole portion (115) and the clamping part (15) are in corresponding operative connection to each other such that the fixed part (10) is axially and radially fixed in the region of the hole portion (115).

11. The brake piston assembly (100) according to claim 10, wherein, the hole walls (116, 116A, 116B) forming the second hole diameter (Di2, Di2A, Di2B) of the hole portion (115) are provided with a retaining groove (117) and / or a retaining boss (117), and the retaining groove and / or the retaining boss are pressed into the side surfaces (16, 16A, 16B) forming the first outer diameter (Da1, Da1A, Da1B) of the clamping part (15).

12. The brake piston assembly (100) according to one of claims 10 and 11, wherein, The fixed part (10) has an adjacent flange (18) which projects radially outwards and abuts against the brake caliper housing (105), in particular against the outer side (119) of the brake caliper housing (105), by means of an adjacent side (19) oriented towards the clamping part (15).

13. An electromechanical motor vehicle disc brake having a brake lining assembly, having a sealing assembly (1) according to one of claims 1 to 8 and having a brake piston assembly (100) according to one of claims 9 to 12, wherein the brake piston assembly (100) comprises a brake caliper housing (105) and a brake piston (130) which is axially movable in a brake piston receiver (106) of the brake caliper housing (105) and has an axial end (131) which projects from the brake caliper housing (105) and is able to apply a driving force in the axial direction to the brake lining assembly.

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