Fixing system and hydraulic device having said fixation system - Patents.com

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 fastening system for fastening an annular body, in particular a cover cap, end shield or the like, to a component, in particular a housing, hydraulic block or the like, in which the annular body has an annular extending side wall with an outer side and an inner side and a flange projecting radially from the outer side, the component having a receiving area for the flange, said component being plastically deformed or adapted to be plastically deformed so that the material of the component is or can be displaced so as to snap-fit ​​from behind onto the flange, in order to fasten the annular body to the component.

[0002] The invention further relates to a hydraulic system, in particular a brake system for a motor vehicle, preferably a brake booster, which comprises a component configured as a hydraulic block having at least one recess for forming a hydraulic chamber and at least one annular body configured as a cover cap and / or as an end shield, closing said recess, the annular body being fixed to the component by means of the above-mentioned fastening system. [Background technology]

[0003] Fastening systems of the type mentioned at the outset are known from the prior art. In hydraulic systems, for example hydraulic brake systems, hydraulic blocks are installed, in particular for guiding and distributing hydraulic medium. For this purpose, for example holes are provided in the hydraulic block, which form hydraulic chambers. To close the holes or chambers, they are covered by separate cover caps which are fastened to the hydraulic block. In this case, it is known to place the cover cap on the hydraulic block and then to plastically deform the hydraulic block so that the cover cap is held in a form-tight manner on the hydraulic block. To simplify this process, the known cover caps have a radially outwardly projecting flange which is snapped in from behind by the material of the hydraulic block which is pushed or crimped in by a crimping process. Summary of the Invention Effect of the Invention

[0004] The fastening system according to the invention with the features of claim 1 has the advantage that the integrity of the body and the component is permanently guaranteed both during the connection process and at a later time. For this purpose, only minor modifications of known fastening systems are necessary without much expense. The fastening system according to the invention is distinguished in that the component has an annular recess with a crimpable lateral wall and a retaining profile that is radially spaced from the lateral wall and that is designed to cooperate in a form-locking manner with the flange at least in the direction away from the lateral wall. The retaining profile ensures that the side walls of the ring body are not displaced radially inwards when the component is crimped and thus do not come off the component. Furthermore, the retaining profile ensures that the crimped joint remains continuously gas-tight and loadable even when the system consisting of the ring body and the component is subsequently put into operation. Even when hydraulic pressure, in particular, acts from the outside or from the inside, the side walls are prevented from being pushed inwards and thus releasing the crimped joint of the component.

[0005] According to a preferred embodiment of the invention, the side wall and the recess are each configured to extend in a circular ring shape. The circular ring shape preferably prevents incorrect assembly of the ring and the component with respect to one another. On the other hand, the circular ring shape ensures a good cooperation of the component and the ring, especially during the crimping process, since the forces are distributed and transmitted evenly.

[0006] Particularly preferably, the flange ends at a radial distance from the outer lateral wall of the recess, so that the radially outer side of the flange is not scratched or damaged by the component during the crimping process, in particular when the annular body is inserted into the recess of the component, thereby ensuring that the crimped material of the component abuts gas-tightly against the annular body, in particular the flange.

[0007] According to an optional embodiment of the invention, the flange forms a press fit with the outer lateral wall of the recess, which ensures that the annular element is securely fixed to the component already before the crimping process, thereby making it possible to carry out the crimping process reliably.

[0008] It is further preferred that the recess has an annular projection which projects radially from the outer lateral wall into the recess in order to form the press fit, i.e. a radial projection which extends in the form of a web over the entire circumference of the outer lateral wall. With such an additional annular projection, a section which is used to form the press fit is formed in the recess, so that a section of the recess which is axially separate from this section, in particular a section of the recess which is axially adjacent to this section, always ensures a play, in particular a radial play, for the flange during assembly. As a result, the flange can be inserted at least in this section without contacting the outer lateral wall. As a result, a section which acts as a press fit and which reaches into the recess without damage, in particular without scratches, is obtained, and during the subsequent crimping operation, the last-mentioned section provides an airtight connection between the component and the ring. In this respect, this contact-free section is a sealing section of the outer lateral wall.

[0009] More preferably, the retaining profile is configured as an inner lateral wall of the recess facing the outer lateral wall, the recess thus being configured as an annular groove in the component, into which the side wall and the flange of the ring can be axially inserted, the inner lateral wall supporting the side wall of the ring during the crimping process, so that a secure connection between the ring and the component is ensured when the component is crimped.

[0010] It is further preferred that the inner lateral wall is configured to extend at least approximately parallel to the outer lateral wall, whereby the crimping force at the inner lateral wall can be preferably transmitted to the component.

[0011] Particularly preferably, the inner lateral wall is configured to form a press fit with the inside of the side wall of the ring, so that during assembly, the ring can first be pushed or pressed onto the inner lateral wall while forming a press fit therein, whereby a presetting of the ring in the component is already ensured, which on the one hand aids the crimping process and on the other hand improves the sealing of the system.

[0012] According to a preferred embodiment of the invention, the retaining profile is formed by an obliquely aligned bottom of the recess, which in this case does not have an inner lateral wall running parallel to the outer lateral wall, since the recess is in particular a first section of a stepped bore, which also forms a hydraulic chamber, but due to the oblique alignment of the bottom, the side wall of the annular body nevertheless provides an abutment contact during the crimping operation, which can support the side wall, in particular during the crimping operation.

[0013] Particularly preferably, the holding profile is formed by an annular groove in the bottom of the recess, which is aligned perpendicularly to the outer side wall. The flange or the side wall preferably has an annular projection on its end side, which can be inserted into the annular groove. During assembly, the annular projection of the side wall is inserted into the recess in such a way that it reaches into the annular groove and is held in a form-locking manner on the component in a transverse direction perpendicular to the insertion direction. Here too, the crimping process is improved by the preferred holding profile with the annular groove and the annular projection. In a preferred manner, the annular projection is configured tooth-shaped, conical, V-shaped or U-shaped in cross section, so that the annular projection can be pressed into the annular groove in a self-centering manner.

[0014] According to a preferred embodiment of the invention, the inner side wall has an undercut, which increases the clearance width of the recess in the insertion direction of the ring body, so that during the crimping operation, the side wall is at least locally moved into the undercut by the crimping force acting on the ring body, so that the ring body is also form-fittingly connected to the component in the recess on the inside of its side wall, thereby increasing the load-bearing capacity of the system formed by the ring body and the component in a preferred manner.

[0015] More preferably, the flange has a radially outwardly projecting projection for forming a press fit and a sealing section arranged at an axial distance from the projection, the sealing section being configured to cooperate in a gas-tight manner with the crimped material of the component. As already mentioned above, the configuration of the pressing section and the sealing section in conjunction with the press projection of the recess ensures that the sealing section is not damaged during assembly of the annular body, thereby ensuring maximum sealing after the crimping process.

[0016] According to a preferred embodiment of the invention, the component or the ring has at least one elastically deformable sealing element, which cooperates in a gas-tight manner with the ring or the component. For this purpose, the sealing element is arranged in particular so that it is elastically clamped or deformed between the ring and the component when the ring and the component are joined together, in order to obtain a high sealing effect. The sealing element is preferably a seal or a sealing ring, for example an O-ring. In particular, the sealing element extends over the entire circumference of the annular recess and / or the entire circumference of the annular side wall of the ring.

[0017] The hydraulic device according to the invention having the features of claim 14 is distinguished by the configuration of the fastening system according to the invention, which results in the advantages already mentioned. Further advantages, preferred features and feature combinations emerge especially from the above description and from the claims. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a simplified longitudinal cross-sectional view of a preferred hydraulic system according to a first embodiment. [Diagram 2] FIG. 11 is a detailed diagram of a hydraulic system according to a second embodiment. [Diagram 3] FIG. 11 is a detailed view of the locking system of the hydraulic system according to the third embodiment. [Figure 4] FIG. 10 is a detailed view of the fixing system of the hydraulic system according to the fourth embodiment. [Diagram 5] FIG. 10 is a detailed view of the fixing system of the hydraulic system according to the fifth embodiment. [Figure 6] FIG. 13 is a detailed view of the fixing system of the hydraulic system according to the sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0020] 1 shows a simplified longitudinal section of a suitable hydraulic device 1, which is configured as an electromechanical brake booster 2. The hydraulic device 1 has a component 4 configured as a hydraulic block 3. The hydraulic block 3, which is made in particular from aluminum, has a through-bore 5 in which an axially movable hydraulic piston 6 and a spindle gear 7, which can be driven by an electric motor, are supported, and by means of which the hydraulic piston 6 can slide. A cover cap 8 and a cover cap 9 are arranged correspondingly to the through-bore 5, which enclose a chamber 10 in which both the hydraulic piston 6 and the spindle gear 7 are located. The cover cap 9, which is also configured in particular as an end shield, supports a rolling element bearing which supports the spindle gear 7. The cover cap 8 is configured as a closing cap which closes the hydraulic chamber between the cover cap 8 and the hydraulic piston 6. Into the hydraulic chamber 11 preferably one or more hydraulic channels open which extend through the hydraulic block 3 or component 4 in order to allow hydraulic medium to flow into or out of the hydraulic chamber 11 upon movement of the hydraulic piston 6.

[0021] The cover caps 8, 9 are each of annular construction and therefore each have a ring-shaped side wall 12, 13. In particular, the side walls 12, 13 are of circular construction. Whereas the cover cap 8 has a closed bottom 14, the cover cap 9 has an opening 15 at its bottom, through which the drive shaft for the spindle gear 7 can be guided. Due to the annular construction of the side walls 12, 13, the cover caps 8, 9 form ring bodies 16, 17 which are fixed to the component 4.

[0022] For fastening the rings 16,17 to the component 4, a fastening system 18 is provided in a preferred manner, which serves for fastening to the two cover caps 8,9.

[0023] As shown in FIG. 1, the component 4 or the hydraulic block 3 each has an annular groove-like recess 19 in its outer wall coaxially to the through bore 5, which recess 19 also extends in the shape of a ring. The fastening system 18 will be explained in more detail below with the aid of the cover cap 8. The fastening system 18 is formed in the side wall 12 and has a flange 20 which projects radially outwards at the free end of the side wall 12. The recess 19 has an inner lateral wall 21 and an outer lateral wall 22 which face each other and are aligned essentially parallel to each other. The distance of the inner lateral wall 21 to the outer lateral wall 22, i.e. the clearance width of the recess 19, corresponds at least approximately to the width of the side wall 12 in the region of the flange 20. In this case, the inner lateral wall 21 forms a suitable retaining profile 23 for the side wall 12, which in particular prevents the side wall 12 of the flange 20 from moving radially inwards. In this case, the inward movement is prevented in a form-locking manner.

[0024] 1 shows a pre-assembly stage in the lower half, in which the cover cap 8 has already been pushed or inserted axially into the recess 19. In a preferred manner, the inner lateral 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 radially acting press fit is formed between the side wall 12 and the side wall 21. The cover cap 8 is thus axially pressed against the inner lateral wall 21. As a result, a tight connection between the cover cap 8 and the component 4 is already obtained during pre-assembly.

[0025] In the next step, when the fastening system 4 is completed, the material of the component 4 is plastically deformed radially outwards in the direction towards the side wall 12, in particular by a crimping process, so that it snaps into the flange 20 from behind and is thereby fixed in the recess 19 in an axially form-locking manner. This deformed state is shown in the upper part of FIG. 1, whereas the component 4 is shown in the lower part in its still undeformed state. The press fit between the side wall 12 and the lateral inner wall 21 of the component 4 ensures that the cover cap 4 is held securely on the component 4 when the material of the component 4 is crimped, and the material of the component 4 snaps into it from behind. This also ensures that the cover cap 8 is not later accidentally removed, because the lateral inner wall 21 reliably prevents the side wall 12 from retracting radially out of the snap-fit. A high load-bearing capacity of the cover cap 8 in the hydraulic block 3 is thus guaranteed, so that high hydraulic pressures can also be generated and utilized in the hydraulic chamber 11. The same applies for the fastening system 18 of the cover cap 9 which is correspondingly configured for the cover cap 8 .

[0026] Alternative embodiments of the fastening system 18 are described in detail below.

[0027] For this purpose, a second preferred embodiment is shown in FIG. 2. The second embodiment differs from the previous embodiment in that the flange 20 has, at its lower end in the drawing, i.e. on the axially free end face, a radial projection 24 which extends over the entire circumference of the flange 20. This radial projection 24 leaves the flange 20 with a section which has a larger radial distance from the lateral outer wall 22. This section serves as a sealing section 25 of the flange 20. The radial projection allows the sealing section 25 to be spaced apart from the material of the component 4 when the flange 20 of the side wall 12 is inserted into the recess 19, so that this material is not damaged, for example scratched. In the subsequent crimping process with the crimping tool 26, as shown by way of example in FIG. 2, the material of the component 4 is plastically deformed and pressed or pushed over the sealing section 25, so that the sealing section 25 remains intact and undamaged, thus ensuring a high sealing effect between the component 4 and the cover cap 8.

[0028] FIG. 2 further shows an optional sealing element 33 acting in the recess 19 between the side wall 12 and the component 4. According to this embodiment, the sealing element 33 is designed as a sealing ring, in particular an O-ring, which is clamped and held between the inside of the side wall 12 and the inner lateral wall 21. The sealing ring is arranged coaxially with the annular shape of the side wall 12 and is elastically clamped 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, when the ring 16 is mounted in the recess 19, lie opposite one another and are each designed to receive a sealing ring locally, so that the sealing ring is securely and permanently held between the two components. Optionally, only the rings 16, 17 or only the component 4 have a receiving groove for the sealing element 33. Alternatively, the sealing element 33 is arranged elsewhere between the rings 16, 17 and the component 4, for example at the bottom of the recess 19, as will be explained in more detail with the embodiment shown in FIG. 3. Basically, the sealing element 33 may be arranged and act at various points between the component 4 and the annular bodies 16, 17, independently of the other configurations of the fastening system 18.

[0029] 3 differs from the previous embodiment in that, when the side wall 12 is installed in the recess 19, the lateral outer wall 22 also has a radial projection 27 which is located at the same height as the radial projection 24. This radial projection 27 increases the protection against damage to the sealing section 25 during assembly. In particular, the clearance width of the recess 19 in the region of the radial projection 24 or the search portion 27 is selected in such a way that the flange 20 is pressed entirely into the recess 19, so that even the radially outer side or radial projection 24 creates a press fit which further increases the subsequent load-bearing capacity or robustness of the fastening system 18.

[0030] The embodiment of FIG. 3 is also optionally provided with a sealing element 33. FIG. 3 shows examples of the positioning of the sealing element 33 at various locations. In the first location, the sealing element 33 is located between the inside of the side wall 12 and the inner lateral wall 21 of the recess 19, just like the sealing ring in the embodiment of FIG. 2. However, in this case, unlike the previous embodiment, the sealing element is configured as a flat seal or a sealing material that is applied to the side wall 12 or the inner lateral wall 21 before assembly. Alternatively, in this embodiment too, the sealing element 33 is configured as a sealing ring or an O-ring.

[0031] According to another embodiment, the sealing element 33 is arranged between the bottom 29, the recess 19 and the axial end side of the side wall 12 or is in the assembled position clamped and elastically deformed, in particular by the side wall 12 and the component 4. Here too, the sealing element 33 can alternatively be designed as a sealing ring, in particular an O-ring.

[0032] 4 shows another embodiment, which differs from the previous one in particular in that the lateral inner wall 21 has an undercut 28. During the crimping process or deformation of the component 4, the side wall 12 is forced radially into the undercut 28 in order to snap-fit ​​the flange 20 from behind by the crimping tool, whereby the side wall 12 is connected in a form-locking manner at the lateral inner wall 28 and is prevented from being pulled out. This further increases the load-bearing capacity of the cover cap 8.

[0033] 5 shows another embodiment of the fastening system 18, which differs from the previous one in that the inner lateral wall 21 extending parallel to the outer lateral wall 22 in the recess 19 is omitted. In this embodiment, the bottom 29 of the recess 19, aligned perpendicular to the axial insertion direction of the inner lateral wall 21 in the previous embodiment, is inclined by an angle α to the vertical in order to form a retention profile 23 for the flange 20. The flange 20 also has an obliquely inclined lower or contact side 30 which extends at least approximately parallel to the bottom 29 in the assembled state. In this case, the inclination of the bottom 29 is selected so that the bottom 29 and the outer lateral wall 22 form an angle α that is smaller than 90°. As also shown by way of example in FIG. 5, during the crimping process with the crimping tool 26, the side wall 12 is form- and friction-fitted with the inclined bottom 29, preventing the side wall 12 from bending radially inward, so that the side wall 12 is snap-fitted from behind by the material of the component 4 or hydraulic block 3.

[0034] 6 shows another embodiment in which the fastening system 18 likewise does not have a lateral inner wall 21. According to this embodiment, the flange 20 has at its end facing the bottom 29 an annular projection 31 which engages in an annular groove 32 in the bottom 29 during assembly. A retaining profile 23 is thereby formed in the recess 19 by the annular groove 32, which cooperates radially with the projection 31 in a form-locking manner. Here too, it is reliably prevented that the side wall 12 retracts 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 Cyclic bodies 18 Fastening System 19 Annular recess 20 Flange 21 Side inner wall 22 Side exterior wall 23 Retaining contour shape 24 Radial projection 25 Seal Classification 26 Crimping tool 27 Radial projection 28 Undercut 29 Bottom 30 Contact side 31 Annular protrusion 32 Annular groove 33 Sealing element 34,35 Receiving groove

Claims

1. 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 annularly 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 pushed or pushed back into a snap-fit ​​engagement with the flange (20) from behind, in order to fasten the annular body (16, 17) to the component (4), 1. A fastening system according to claim 1, wherein the component (4) has an annular recess (19) with a crimpable outer lateral wall (22) and a retaining profile (23) radially spaced from the outer lateral wall (22), the retaining profile (23) being configured to cooperate in a form-locking manner with the flange (20) at least in a direction away from the outer lateral wall (22).

2. The fastening system according to claim 1, characterized in that the side wall (12) and the recess (19) are configured to extend in a circular ring shape.

3. A fastening system according to any one of the preceding claims, characterized in that said flange (20) terminates at a radial distance from said lateral outer wall (22) of said recess (19).

4. A fastening system according to claims 1 and 2, characterized in that said flange (20) forms a press fit with said lateral outer wall (22) of said recess (19).

5. 5. The fastening system according to claim 4, characterized in that the recess (19) has an annular projection (27) projecting radially from the lateral outer wall (22) into the recess (19) to form a press fit.

6. 10. The fastening system according to claim 1, characterized in that the retaining profile (23) is configured as an inner lateral wall (21) of the recess (19) facing the outer lateral wall (22).

7. 7. The fastening system according to claim 6, characterized in that the inner lateral wall (21) is configured to extend at least approximately parallel to the outer lateral wall (22).

8. 8. A fastening system according to claim 6 or 7, characterized in that the inner lateral wall (21) is configured to form a press fit with the inside of the side wall (12) of the annular body (16, 17).

9. 10. Fastening system according to any one of the preceding claims, characterized in that the retention profile (23) is formed by an obliquely aligned bottom (29) of the recess (19).

10. 10. The fastening system according to claim 9, characterized in that the retaining profile (23) is formed by an annular groove (32) in the bottom (29) of the recess (19) aligned in a perpendicular manner to the lateral outer wall (22), and the flange (20) and / or the side wall (12) have, on their end faces, an annular projection (31) which can be inserted into the annular groove (32).

11. Fastening system according to any one of the preceding claims, characterized in that the lateral inner wall (21) has an undercut (28).

12. 10. The fastening system according to claim 9, characterized in that the flange (20) has a radially outwardly projecting projection (24) for forming a press fit and a sealing section (25) arranged axially spaced from the projection (24), the sealing section (25) being configured to cooperate in an airtight manner with the crimped material of the component (4).

13. 10. The fastening system according to claim 1, characterized in that the component (4) or the annular body (16, 17) has at least one elastically deformable sealing element (33), which cooperates in a gas-tight manner with the annular body (16, 17) or with the component (4).

14. A hydraulic system (1), in particular a brake system for a motor vehicle, preferably a brake booster (2), comprising a component (4) configured as a hydraulic block (3) having at least one recess for forming a chamber (10) and at least one ring-shaped body (16, 17) configured as a cover cap (8, 9) and / or as an end shield, closing said chamber (10), said ring-shaped body (16, 17) being fixed to said component (4) by a fastening system (18), Hydraulic device (1), characterized in that the fastening system (18) is constructed according to one or more of claims 1 to 13.

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