Fixing system and hydraulic device having this fixing system

Abstract

The invention relates to a fastening system (18) for fastening an annular body (16, 17), in particular a cover cap (8, 9), an end shield or the like, to a component (4), in particular a housing, a hydraulic block (3) or the like, in which the annular body (16, 17) has an annular extending side wall (12) with an outer side and an inner side and a flange (20) projecting radially from the outer side, the component (4) having a receiving area for the flange (20), the component (4) being plastically deformed or adapted to be plastically deformed so that the material of the component (4) is or can be displaced so as to snap-fit ​​from behind onto the flange (20) in order to fasten the annular body (16, 17) to the component (4). [Solution] The component (4) has an annular recess (19) with a crimpable outer side wall (22) and a retaining profile (23) radially spaced from the outer side wall (22), the retaining profile (23) being configured to cooperate with the flange (20) in a form-locking manner.

Description

Technical Field

[0001] The present invention relates to a fixing system for fixing an annular body, particularly a cover cap, a terminal shield, etc. to a component, particularly a housing, a hydraulic block, etc., wherein the annular body has an annular side wall extending in a circumferential direction and having an outer side, an inner side, and a flange protruding radially outward from the outer side, and the component has a receiving area for the flange, and the component is plastically deformed or is to be plastically deformed so that the material of the component engages with the flange in a snap - type manner from behind for fixing the annular body to the component.

[0002] Furthermore, the present invention relates to a hydraulic device, particularly a braking device for a motor vehicle, preferably a brake booster, comprising a component configured as a hydraulic block having at least one notch for forming a hydraulic chamber, and at least one annular body configured as a cover cap and / or a terminal shield for closing the notch, and the annular body is fixed to the component by the above - mentioned fixing system.

Background Art

[0003] A fixing system of the type described at the beginning is known from the prior art. In a hydraulic system, for example, a hydraulic braking system, a hydraulic block for guiding and distributing a hydraulic medium is incorporated. For this purpose, for example, holes are provided in the hydraulic block, and these holes form hydraulic chambers. To close the holes or chambers, the holes or chambers are covered by a separate cover cap fixed to the hydraulic block. In this case, it is known to place the cover cap on the hydraulic block and then plastically deform the hydraulic block so that the cover cap is held in a form - fitting manner on the hydraulic block. To simplify this process, known cover caps have a flange protruding radially outward, and this flange is engaged in a snap - type manner from behind by the material of the hydraulic block that has been pushed or caulked by a caulking process. [Overview of the Initiative] [Effects of the Invention]

[0004] The fastening system according to the present invention, having the features of claim 1, has the advantage that the integrity of the main body and components is continuously guaranteed during the connection process and at a later point in time. This can be achieved by making only minor modifications to known fastening systems without incurring significant costs. The fastening system according to the present invention is superior in that the components have an annular recess having a crimpable side outer wall and a retaining contour shape that is radially spaced relative to the side outer wall, wherein the retaining contour shape is configured to cooperate with the flange in a shape-fastening manner, at least in a direction away from the side outer wall. The retaining contour shape prevents the side wall of the annular body from being radially displaced inward when the component is crimped, and thus prevents it from coming off the component. Furthermore, the retaining contour shape ensures that the crimped joint remains continuously airtight and load-bearing even when the system consisting of the annular body and components is operated later. Even when hydraulic pressure acts from the outside or inside, the side wall is prevented from being pushed inward and releasing the crimped joint of the component.

[0005] According to a preferred embodiment of the present invention, the side walls and recesses are configured to extend in an annular shape. The annular shape preferably prevents misassembly between the annular body and its components. On the other hand, the annular shape ensures good cooperation between the components and the annular body, particularly during the crimping process, because forces are uniformly distributed and transmitted.

[0006] Particularly preferable is that the flange terminates with a radial gap from the side outer wall of the recess. As a result, during the crimping process, especially when the annular body is inserted into the recess of the component, the radially outer surface of the flange is not scratched or damaged by the component. This ensures that the crimped material of the component makes airtight contact with the annular body, especially the flange.

[0007] According to an optional embodiment of the present invention, the flange is configured to form a press fit with the side outer wall of the recess. This ensures that the annular element is securely fixed to the component before the crimping process, thus allowing the crimping process to be carried out reliably.

[0008] More preferably, the recess has an annular projection that protrudes radially from the side outer wall into the recess in order to form a press fit, i.e., a radial projection that extends in a web-like manner around the entire circumference of the side outer wall. Because such an additional annular projection forms a section within the recess used to form a press fit, a section of the recess that is axially separate from this section, and in particular a section of the recess that is axially adjacent to this section, always ensures play, especially radial play, with respect to the flange during assembly. This allows the flange to be inserted without contacting the side outer wall, at least within this section. This provides a section that functions as a press fit and a section that can be reached into the recess without damage, especially without scratching, and during the subsequent crimping operation, the last section provides an airtight connection between the component and the annular body. In this respect, this contactless section is a sealing section of the side outer wall.

[0009] More preferably, the retaining contour shape is configured as the inner side wall of a recess facing the outer side wall. Thus, this recess is configured as an annular groove within the component, into which the side wall and flange of the annular body can be inserted axially. This inner side wall supports the side wall of the annular body during the crimping process, thereby ensuring a secure connection between the annular body and the component during crimping of the component.

[0010] More preferably, the inner side wall is configured to extend at least generally parallel to the outer side wall. This allows the crimping force in the inner side wall to be preferably transmitted to the components.

[0011] Particularly preferable, the inner side wall is configured to form a press fit with the inside of the side wall of the annular body. This allows the annular body to be pushed or crimped during assembly, first forming a press fit with the inner side wall. The press fit pre-prepares the annular body in the component, which assists the crimping process on the one hand and improves the sealing performance of the system on the other.

[0012] According to a preferred embodiment of the present invention, the retaining contour shape is formed by the bottom of the recess, which is aligned at an angle. In this case, the recess is a first section of a stepped hole, which also forms a hydraulic chamber, and therefore the recess does not have an inner side wall that extends parallel to the outer side wall. Nevertheless, by aligning the bottom at an angle, the side wall of the annular body provides contact that can support the side wall during the crimping process, particularly during the crimping process.

[0013] Particularly preferably, the retaining contour shape is formed by an annular groove provided at the bottom of the recess, aligned perpendicular to the side outer wall. The flange or side wall preferably has an annular projection on its end face side that can be inserted into the annular groove. This allows the annular projection of the side wall to be inserted into the recess during assembly so that the annular projection reaches into the annular groove and is held to the component in a shape-fastening manner in a lateral direction perpendicular to the insertion direction. In this case as well, the crimping process is improved by a suitable retaining contour shape using the annular groove and annular projection. Preferably, the annular projection is configured in a toothed, conical, V-shaped, or U-shaped manner when viewed in cross-section, so that the annular projection can be pushed into the annular groove in a self-centering manner.

[0014] According to a preferred embodiment of the present invention, the inner side wall has an undercut. The undercut increases the inner width of the recess in the direction of insertion of the annular body. As a result, during the crimping process, the side wall is moved at least regionally into the undercut by the crimping force acting on the annular body, thereby the annular body is connected to the components in a shape-fastening manner both inside its side wall and within the recess. This enhances the load-bearing capacity of the system formed from the annular body and the components in a preferred manner.

[0015] More preferably, the flange has a radially outward projection for forming a press fit and a sealing section positioned axially spaced relative to this projection, the sealing section being configured to work airtightly with the crimped material of the component. As already mentioned above, in relation to the press projection of the recess, the configuration of the press section and the sealing section ensures that the sealing section is not damaged during the assembly of the annular body, thereby ensuring maximum sealing performance after the crimping process.

[0016] According to a preferred embodiment of the present invention, the component or annular body has at least one elastically deformable sealing element, which cooperates airtightly with the annular body or component. For this purpose, the sealing element is arranged to be elastically tightened or deformed between the annular body and the component when the annular body and the component are joined, in order to obtain a high sealing effect. The sealing element is preferably a sealing material or a sealing ring, such as an O-ring. In particular, the sealing element extends around the entire circumference of the annular recess and / or around the entire circumference of the annular side wall of the annular body.

[0017] The hydraulic device according to the present invention having the features of claim 14 is superior in the configuration of the fixed system according to the present invention. This provides the advantages already mentioned. Other advantages, preferred features and combinations of features are obtained in particular from the above description and from the multiple claims. [Brief explanation of the drawing]

[0018] [Figure 1] This is a simplified longitudinal cross-sectional view of a preferred hydraulic system according to the first embodiment. [Figure 2] This is a detailed diagram of the hydraulic system according to the second embodiment. [Figure 3] This is a detailed diagram of the fixing system for the hydraulic system according to the third embodiment. [Figure 4] This is a detailed diagram of the fixing system for the hydraulic system according to the fourth embodiment. [Figure 5] This is a detailed diagram of the fixing system for the hydraulic system according to the fifth embodiment. [Figure 6] This is a detailed diagram of the fixing system for the hydraulic system according to the sixth embodiment. [Modes for carrying out the invention]

[0019] The present invention will be described in detail below with reference to the drawings.

[0020] Figure 1 shows a simplified longitudinal sectional view of a suitable hydraulic device 1 configured as an electromechanical brake multiplier device 2. The hydraulic device 1 has a component 4 configured as a hydraulic block 3. The hydraulic block 3, particularly made of aluminum, has a through-hole 5, in which a hydraulic piston 6 movable in the axial direction and a spindle transmission device 7 drivable by an electric motor are supported, and the hydraulic piston 6 can be moved by the spindle transmission device 7. A cover cap 8 and a cover cap 9 are correspondingly arranged in the through-hole 5, and a chamber 10 is surrounded by these cover caps 8, 9, and both the hydraulic piston 6 and the spindle transmission device 7 are located in this chamber 10. The cover cap 9, which is also configured as a terminal shield, supports a rolling bearing for bearing the spindle transmission device 7. The cover cap 8 is configured as a closing cap for closing the hydraulic chamber between the cover cap 8 and the hydraulic piston 6. In the hydraulic chamber 11, preferably one or more hydraulic flow paths are open, and these hydraulic flow paths extend through the hydraulic block 3 or the component 4 so that the hydraulic medium can flow into or out of the hydraulic chamber 11 during the movement of the hydraulic piston 6.

[0021] <00OO086>The cover caps 8, 9 are each configured in an annular shape and thus each have an annularly extending side wall 12, 13. Particularly, the side walls 12, 13 are configured to extend in an annular shape. While the cover cap 8 has a closed bottom 14, the cover cap 9 has an opening 15 at its bottom, and a drive shaft for the spindle transmission device 7 can pass through and be guided through this opening 15. Based on the annular configuration of the side walls 12, 13, the cover caps 8, 9 form annular bodies 16, 17 fixed to the component 4. 〈0000088〉 To fix the annular bodies 16, 17 to the component 4, a fixing system 18 is provided in a suitable form, and this fixing system 18 is used for fixing to the two cover caps 8, 9. [[ID=IO]]

[0023] As shown in FIG. 1, the component 4 or the hydraulic block 3 has one annular groove-like recess 19 on its outer wall coaxially with the through-hole 5, and these recesses 19 each extend in an annular shape as well. The fixing system 18 will be described in detail below using the cover cap 8. The fixing system 18 is formed on the side wall 12 and has a flange 20 that protrudes radially outward at the free end of the side wall 12. The recess 19 has a side inner wall 21 and a side outer wall 22, and these side inner wall 21 and side outer wall 22 face each other and are generally aligned parallel to each other. The distance between the side inner wall 21 and the side outer wall 22 with respect to the side outer wall 22, that is, the inner normal width of the recess 19, is at least approximately equivalent to the width of the side wall 12 in the region of the flange 20. In this case, the side inner wall 21 forms a suitable retaining contour shape 23 for the side wall 12 that particularly prevents the side wall 12 of the flange 20 from moving radially inward. In this case, the inward movement is prevented in a form-locking manner.

[0024] FIG. 1 shows the pre-assembly stage in the lower half. At this pre-assembly stage, the cover cap 8 has already been axially pushed or inserted into the recess 19. In a suitable form, the side inner wall 21 has an outer diameter that is slightly larger than the inner diameter of the side wall 12 in the region of the flange 20, so that when the side wall 12 is pushed into the recess 19, a press fit acting radially between the side wall 12 and the side wall 21 is formed. Therefore, the cover cap 8 is axially crimped to the side inner wall 21. Thereby, a firm connection between the cover cap 8 and the component 4 is already obtained during pre-assembly.

[0025] In the next stage, when the fixing system 4 is completed, the material of component 4 is plastically deformed in the direction from radially outward toward the side wall 12, particularly by the crimping process, so that the material of component 4 snaps into place with the flange 20 from behind, thereby fixing it in the recess 19 in an axial shape-fastening manner. This deformed state is shown at the top of Figure 1, while the undeformed state of component 4 is shown at the bottom. The press fit between the side wall 12 and the inner side wall 21 of component 4 ensures that the cover cap 4 is securely held to component 4 when the material of component 4 is crimped, and the material of component 4 snaps into place from behind. This also ensures that the cover cap 8 does not come off unexpectedly later, because the inner side wall 21 reliably prevents the side wall 12 from retracting radially and disengaging from the snap engagement. Thus, the high load-bearing capacity of the cover cap 8 in the hydraulic block 3 is ensured, so that high hydraulic pressure can be generated and utilized in the hydraulic chamber 11. The same applies to the fixing system 18 for the cover cap 9, which is configured to correspond to the cover cap 8.

[0026] Another embodiment of the fixed system 18 is described in detail below.

[0027] For this purpose, a preferred second embodiment is shown in Figure 2. The second embodiment differs from the previous embodiment in that the flange 20 has a radial projection 24 extending around the entire circumference of the flange 20 at its lower end, i.e., the axially free end face side, in the drawing. This radial projection 24 leaves a section of the flange 20 with a larger radial spacing from the side outer wall 22. This section is used as a sealing section 25 of the flange 20. The radial projection allows the sealing section 25 to maintain a distance from the material of the component 4 when the flange 20 of the side wall 12 is inserted into the recess 19, thereby preventing the material from being damaged, for example, scratched. As shown as an example in Figure 2, in the subsequent crimping process with the crimping tool 26, the material of the component 4 is plastically deformed and pressed or pressed against the sealing section 25, thereby ensuring that the sealing section 25 remains intact and undamaged, thus compensating for a high sealing effect between the component 4 and the cover cap 8.

[0028] Furthermore, Figure 2 shows an optional seal element 33 acting between the side wall 12 and the component 4 within the recess 19. In this embodiment, the seal element 33 is configured as a seal ring, particularly an O-ring, that is tightly held between the inside of the side wall 12 and the inner side wall 21. The seal ring is positioned coaxially with the annular shape of the side wall 12 and is elastically tightly held or deformed between the side wall 12 and the component 4. In particular, the side wall 12 and the component 4 have receiving grooves 34, 35, which are positioned facing each other when the annular body 16 is assembled in the recess 19 and are configured to receive the seal ring regionally, so that the seal ring is securely and continuously held between the two components. Optionally, only the annular bodies 16, 17 or only the component 4 has receiving grooves for the seal element 33. Selectively, the seal element 33 is located at a different location between the annular bodies 16, 17 and the component 4, for example, at the bottom of the recess 19, as described in detail using the embodiment shown in Figure 3. Basically, the sealing element 33 may be positioned and function at various locations between the component 4 and the annular bodies 16 and 17, regardless of the other configurations of the fixing system 18.

[0029] The embodiment shown in Figure 3 differs from the previous embodiment in that, with the side wall 12 incorporated into the recess 19, the side outer wall 22 also has a radial projection 27 located at the same height as the radial projection 24. This radial projection 27 enhances protection against damage to the seal section 25 during assembly. In particular, the inner width of the recess 19 within the area of ​​the radial projection 24 or the exploration section 27 is selected so that the flange 20 is pushed into the recess 19 as a whole, thus creating a press fit that further enhances the subsequent load-bearing capacity or robustness of the fixing system 18, even on the radially outer side or the radial projection 24.

[0030] In the embodiment shown in Figure 3, a seal element 33 is optionally provided. Figure 3 shows examples of positioning the seal element 33 at various locations. In the first location, the seal element 33 is positioned between the inside of the side wall 12 and the inner side wall 21 of the recess 19, similar to the seal ring in the embodiment of Figure 2. However, in this case, unlike the previous embodiment, the seal element is configured as a flat seal or sealing material that is brought to the side wall 12 or the inner side wall 21 before assembly. Selectively, in this embodiment as well, the seal element 33 is configured as a seal ring or an O-ring.

[0031] In another embodiment, the seal element 33 is positioned between the bottom 29, the recess 19, and the axial end face of the side wall 12, or assembled in such a position, that it is tightly compressed and elastically deformed by the side wall 12 and the component 4. In this location as well, the seal element 33 may selectively be configured as the seal ring, particularly an O-ring.

[0032] Figure 4 shows another embodiment, which differs from the previous embodiment in that the inner side wall 21 has an undercut 28. During the crimping process or deformation of component 4, the side wall 12 is pushed radially into the undercut 28 in order to snap the flange 20 from the rear by the crimping tool, thereby forming a shape-fastened connection between the side wall 12 and the inner side wall 28, preventing the side wall 12 from being pulled out. This further improves the load-bearing capacity of the cover cap 8.

[0033] Figure 5 shows another embodiment of the fixing system 18, which differs from the previous embodiment in that the side inner wall 21 extending parallel to the side outer wall 22 in the recess 19 is omitted. In this embodiment, the bottom 29 of the recess 19, which in the previous embodiment is aligned perpendicular to the axial insertion direction of the side inner wall 21, is inclined at an angle α with respect to the perpendicular to form a retaining contour shape 23 for the flange 20. The flange 20 also has an obliquely inclined lower or contact side 30 that extends at least generally parallel to the bottom 29 when assembled. In this case, the inclination of the bottom 29 is selected such that the bottom 29 and the side outer wall 22 form an angle α less than 90°. As shown in Figure 5 as an example, in the crimping process using the crimping tool 26, the side wall 12 is fixed to the inclined bottom 29 by shape and friction fastening, which prevents the side wall 12 from bending radially inward. Thus, the side wall 12 is snap-fitted from behind by the material of the component 4 or the hydraulic block 3.

[0034] Figure 6 shows another embodiment in which the fixing system 18 also lacks a side inner wall 21. In this embodiment, the flange 20 has an annular projection 31 at its end facing the bottom 29, which engages with an annular groove 32 in the bottom 29 during assembly. This creates a retaining contour shape 23 within the recess 19 by the annular groove 32, which cooperates radially with the projection 31 in a shape-fastening manner. Here again, the side wall 12 is reliably prevented from retracting during the crimping process. [Explanation of symbols]

[0035] 1. Hydraulic device 2. Brake booster 3. Hydraulic block 4 components 5 Through hole 6. Hydraulic piston 7. Spindle transmission 8,9 Cover cap 10 rooms 11. Hydraulic chamber 12,13 side wall 15 Aperture 16,17 Ring bodies 18 Fixed System 19 Annular recess 20 flanges 21 Side interior wall 22 Side exterior wall 23 Retaining contour shape 24 Radial projection 25 Seal Classification 26 Crimping Tools 27 Radial projection 28 Undercut 29 Bottom 30 Matching side 31 Annular projection 32 Annular groove 33 sealing element 34,35 Receiving groove

Claims

1. A fixing system (18) for fixing annular bodies (16, 17) to a component (4), wherein the annular bodies (16, 17) have annularly extending side walls (12) having an outer and inner side and a flange (20) projecting radially from the outer side, the component (4) has a receiving area for the flange (20), and the component (4) is of a type in which the material of the component (4) is pushed and shifted or plastically deformed so as to be pushed and shifted so as to snap-fit ​​with the flange (20) from the rear in order to fix the annular bodies (16, 17) to the component (4), The component (4) has an annular recess (19) comprising a crimpable side outer wall (22) and a retaining contour shape (23) that maintains a radial distance from the side outer wall (22), wherein the retaining contour shape (23) is configured to cooperate with the flange (20) in a shape-fastening manner, at least in a direction away from the side outer wall (22). A fixing system characterized in that the flange (20) forms a press fit with the side outer wall (22) of the recess (19).

2. The fixing system according to claim 1, characterized in that the side wall (12) and the recess (19) are configured to extend in an annular shape.

3. The fixing system according to claim 1 or 2, characterized in that the flange (20) ends with a radial distance from the side outer wall (22) of the recess (19).

4. The fixing system according to claim 1, characterized in that the recess (19) has a radial projection (27) that protrudes radially from the side outer wall (22) into the recess (19) in order to form a press fit.

5. The fixing system according to claim 1 or 2, characterized in that the retaining contour shape (23) is configured as the side inner wall (21) of the recess (19) facing the side outer wall (22).

6. The fixing system according to claim 5, characterized in that the side inner wall (21) is configured to extend at least substantially parallel to the side outer wall (22).

7. The fixing system according to claim 5, characterized in that the side inner wall (21) is configured to form a press fit with the inside of the side wall (12) of the annular body (16, 17).

8. A fastening system (18) for fixing an annular body (16, 17) to a component (4), wherein the annular body (16, 17) has an annularly extending side wall (12) having an outer and inner side and a flange (20) projecting radially from the outer side, the component (4) has a receiving area for the flange (20), and the component (4) is plastically deformed or plastically deformed so that the material of the component (4) is pushed and shifted so as to snap-fit ​​to the flange (20) from the rear in order to fasten the annular body (16, 17) to the component (4), The component (4) has an annular recess (19) comprising a crimpable side outer wall (22) and a retaining contour shape (23) that maintains a radial distance from the side outer wall (22), wherein the retaining contour shape (23) is configured to cooperate with the flange (20) in a shape-fastening manner, at least in a direction away from the side outer wall (22). A fixing system characterized in that the retaining contour shape (23) is formed by the bottom portions (29) of the recess (19) which are aligned at an angle.

9. A fastening system (18) for fixing an annular body (16, 17) to a component (4), wherein the annular body (16, 17) has an annularly extending side wall (12) having an outer and inner side and a flange (20) projecting radially from the outer side, the component (4) has a receiving area for the flange (20), and the component (4) is plastically deformed or plastically deformed so that the material of the component (4) is pushed and shifted so as to snap-fit ​​to the flange (20) from the rear in order to fasten the annular body (16, 17) to the component (4), The component (4) has an annular recess (19) comprising a crimpable side outer wall (22) and a retaining contour shape (23) that maintains a radial distance from the side outer wall (22), wherein the retaining contour shape (23) is configured to cooperate with the flange (20) in a shape-fastening manner, at least in a direction away from the side outer wall (22). A fixing system characterized in that the retaining contour shape (23) is formed by an annular groove (32) provided in the bottom portion (29) of the recess (19) which is aligned at a particular right angle to the side outer wall (22), and the flange (20) and / or the side wall (12) have an annular projection (31) on their end face side that can be inserted into the annular groove (32).

10. The fixing system according to claim 5, characterized in that the side inner wall (21) has an undercut (28).

11. A fastening system (18) for fixing an annular body (16, 17) to a component (4), wherein the annular body (16, 17) has an annularly extending side wall (12) having an outer and inner side and a flange (20) projecting radially from the outer side, the component (4) has a receiving area for the flange (20), and the component (4) is plastically deformed or plastically deformed so that the material of the component (4) is pushed and shifted so as to snap-fit ​​to the flange (20) from the rear, in order to fasten the annular body (16, 17) to the component (4), The component (4) has an annular recess (19) comprising a crimpable side outer wall (22) and a retaining contour shape (23) that maintains a radial distance from the side outer wall (22), wherein the retaining contour shape (23) is configured to cooperate with the flange (20) in a shape-fastening manner, at least in a direction away from the side outer wall (22). A fastening system characterized in that the flange (20) has a radially outward projection (24) for forming a press fit, and a seal section (25) positioned at an axial distance from the projection (24), wherein the seal section (25) is configured to cooperate in an airtight manner with the crimped material of the component (4).

12. A fastening system (18) for fixing an annular body (16, 17) to a component (4), wherein the annular body (16, 17) has an annularly extending side wall (12) having an outer and inner side and a flange (20) projecting radially from the outer side, the component (4) has a receiving area for the flange (20), and the component (4) is plastically deformed or plastically deformed so that the material of the component (4) is pushed and shifted so as to snap-fit ​​to the flange (20) from the rear, in order to fasten the annular body (16, 17) to the component (4), The component (4) has an annular recess (19) comprising a crimpable side outer wall (22) and a retaining contour shape (23) that maintains a radial distance from the side outer wall (22), wherein the retaining contour shape (23) is configured to cooperate with the flange (20) in a shape-fastening manner, at least in a direction away from the side outer wall (22). A fixing system characterized in that the component (4) or the annular body (16, 17) has at least one elastically deformable sealing element (33), and the sealing element (33) works in an airtight manner with the annular body (16, 17) or the component (4).

13. A hydraulic device (1), a brake device, preferably a brake booster (2), comprising a component (4) configured as a hydraulic block (3) having at least one notch for forming a chamber (10), and at least one annular body (16, 17) configured as a cover cap (8, 9) and / or an end shield for closing the chamber (10), wherein the annular body (16, 17) is fixed to the component (4) by a fixing system (18), A hydraulic device (1) characterized in that the fixing system (18) is the fixing system according to any one of claims 1, 8, 9, 11, and 12.

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