COMBINATION OF A COVER AND A HOUSING

Description

[0001] The invention relates to a combination of a cover and a housing with features of the preamble of claim 1. State of the art

[0002] US 3,479,068 A discloses an assembly comprising a master cylinder and a reservoir for a hydraulic pressure medium. The reservoir has a pin-shaped projection with which it is held in a receptacle on the master cylinder. The master cylinder and reservoir are firmly connected to one another by an elastic ring arranged in opposing grooves on the outer circumference of the projection and on the inner circumferential wall of the receptacle. A leading groove flank of the groove in the receptacle, in the direction of insertion of the cover, runs obliquely from the inside to the outside in the insertion direction, while the groove flanks of the groove on the projection run perpendicular to the direction of insertion of the cover.

[0003] European patent application EP 0 133 455 A2 discloses a closure with a lid having an axially short, tubular collar that projects into the opening of a plastic container. A clamping ring made of soft, elastic rubber is arranged between the collar and an inner peripheral surface of the container opening. This clamping ring is clamped by an interference fit between the collar of the lid and the inner peripheral surface of the container opening, and connects the lid to the container by friction. The collar of the lid has a circumferential conical surface on the outside, which clamps the rubber-elastic clamping ring radially outward against the inner peripheral surface of the container opening when an outward force is exerted on the lid.The clamping force with which the lid clamps the clamping ring radially outwards is greater the higher the outward-directed force on the lid, so that the lid cannot be removed from the container without being destroyed.

[0004] US Patent No. 3,429,476 discloses a closure of a container with a lid by means of a clamping ring consisting of two half rings that can be pulled apart and together in opposite directions using clamping mechanisms. The two clamping mechanisms are arranged at opposite circumferential points of the clamping ring and each have two pairs of levers and a screw tensioner. The half rings are located in a circumferential groove on the outside of the lid and can be clamped outward in opposite directions using the two clamping mechanisms until they engage a circumferential groove in an inner circumferential surface of an opening in the container, thereby connecting the lid to the container.

[0005] Russian patent application SU 1 569 478 A1 discloses a fastening of a closure in one end of a hydraulic cylinder, wherein the closure has an axial passage for a piston rod. For its fastening, the closure has a circumferential annular step on its outer circumference, and the cylinder has a circumferential groove in its inner circumference opposite the annular step. A radially corrugated and resilient connecting ring is inserted into the groove. Outwardly directed corrugations of the connecting ring engage in the circumferential groove in the end of the cylinder, and inwardly directed corrugations of the connecting ring engage behind the annular step of the closure. Disclosure of the invention

[0006] The combination according to the invention with the features of claim 1 comprises a lid and a housing, wherein the housing has a recess as a receptacle for the lid, into which the lid is inserted completely or preferably partially in an insertion direction and from which the lid can protrude. Inserting the lid into the receptacle of the housing can also be understood as inserting the lid into the receptacle of the housing. An inner peripheral wall of the receptacle of the housing for the lid runs in the insertion direction. In particular, the inner peripheral wall of the receptacle is cylindrical, but it can also have a different round and / or square cross-section that is constant in shape and size over a depth of the receptacle.

[0007] The cover has a circumferential groove on the outside, and the receptacle has a circumferential groove on the inside in its inner circumferential wall. The grooves lie opposite one another when the cover is fastened to the housing, whereby the grooves can be slightly offset in the insertion direction. A connecting ring is arranged in the grooves and is spring-loaded in the radial direction to facilitate fastening. The connecting ring engages both inwardly in the groove of the cover and outwardly in the groove in the inner circumferential wall of the housing receptacle for the cover, and connects the cover to the housing by contacting the groove flanks of the two grooves that are opposite one another in the insertion direction.

[0008] According to the invention, a front groove flank of the groove of the cover in the insertion direction and a rear groove flank of the groove in the insertion direction in the inner circumferential wall of the receptacle of the housing for the cover run obliquely from the inside to the outside in the insertion direction, wherein the front groove flank of the groove of the cover in the insertion direction has a more obtuse cone angle than the rear groove flank of the groove in the inner circumferential wall of the receptacle of the housing for the cover in the insertion direction.

[0009] The course of the front groove flank of the cover groove, diagonally from the inside out in the direction the cover is inserted into the receptacle, exerts radial outward pressure on the connecting ring in the sense of widening the connecting ring when the cover is subjected to pressure to be released from the receptacle. In the opposite direction, the course of the rear groove flank in the inner peripheral wall of the housing's receptacle for the cover, diagonally from the inside out in the direction the cover is inserted into the receptacle, exerts radial inward pressure on the connecting ring in the sense of reducing its diameter. Due to the opposing pressure on the connecting ring by the groove flanks of the cover grooves and in the inner peripheral wall of the receptacle, the connecting ring is held in these two grooves in such a way that even under high pressure in the receptacle and in the cover it projects into both grooves and rests against both groove flanks, so that the cover is securely held in the receptacle.

[0010] The invention is particularly intended for fastenings with a receptacle diameter of approximately 26 mm and more, because from such a diameter onwards, fastening and sealing by caulking at an opening of the receptacle requires too high a forming force.

[0011] The invention enables a simple and quick attachment of the cover to the housing by inserting the cover into the housing's receptacle. Furthermore, the invention enables a mechanically stable attachment of the cover to the housing, which withstands high loosening forces directed opposite to the insertion direction.

[0012] The dependent claims relate to further developments and advantageous embodiments of the invention specified in the independent claim.

[0013] The invention is particularly intended for a hydraulic block of a hydraulic unit of a brake pressure control system of a hydraulic vehicle brake system. There, the cover is fastened to, for example, a blind hole which serves, for example, to accommodate a pedal travel simulator, a hydraulic accumulator or a damper chamber. Such a hydraulic block is used for the mechanical fastening and hydraulic interconnection of components of the brake pressure control system, such as solenoid valves, a pedal travel simulator, hydraulic accumulators, damper chambers and other components. Interconnection means a hydraulic connection of the components according to a hydraulic circuit diagram of the brake pressure control system. Equipped with the components of the brake pressure control system, the hydraulic block forms the hydraulic unit of the brake pressure control system. It is connected to a master brake cylinder via brake lines, and hydraulic wheel brakes are also connected to the hydraulic block orconnected to the hydraulic unit.

[0014] "Brake pressure control" refers, for example, to the control of hydraulic brake pressure during power braking and / or wheel slip control. Examples of wheel slip control include anti-lock control, traction control, and vehicle dynamics control, the latter also referred to as electronic stability control and colloquially as anti-skid control. The abbreviations ABS, ASR, FDR, and ESP are commonly used for these wheel slip control systems. Such brake pressure control systems are well known and will not be discussed further here. Short description of the drawing

[0015] The invention is explained in more detail below with reference to an embodiment illustrated in the drawing. In the drawings: Figure 1 shows an axial section through a combination according to the invention; Figure 2 shows an enlarged view of the combination; Figures 3 and 4 show two states during manufacture of the combination; and Figure 5 shows an axial section through a second embodiment of a combination according to the invention. Embodiments of the invention

[0016] Figure 1shows a section of a hydraulic block 1 of a hydraulic unit of a brake pressure control system of a hydraulic vehicle brake system in the area of ​​a so-called pedal travel simulator. The hydraulic block 1 has a cylindrical blind hole 2 for receiving a piston 4 of the pedal travel simulator. Instead of the pedal travel simulator, a hydraulic accumulator and / or a damper chamber can also be arranged in the blind hole 2, for example. The list is exemplary and not exhaustive. The hydraulic block 1 can also be understood as the housing 3 of the pedal travel simulator, hydraulic accumulator, or damper chamber, and generally as the housing 3. The piston 4 has a cylindrical extension 5 with a smaller diameter at an end facing an opening of the blind hole 2.

[0017] Towards the opening, the blind hole 2 widens to a larger diameter with an annular step. The annular step forms a depth stop 6 for a cover 7. A larger-diameter section of the blind hole 2 between the annular step and the opening of the blind hole 2 forms a recess in the hydraulic block 1 and a receptacle 8 for the cover 7 in the hydraulic block 1, which forms the housing 3 of a combination according to the invention.

[0018] The cover 7 is a cup-shaped, cylindrical hollow body with a closed and an open end, with the open end located in the receptacle 8 of the hydraulic block 1 forming the housing 3. The closed end of the cover 7 protrudes from the hydraulic block 1. Located in the cover 7 is a disc spring assembly 22 serving as a piston spring, which is supported internally on the closed end of the cover 7 and forces the piston 4 into the blind hole 2.

[0019] A perforated disc 10 is arranged between an end edge 9 at the open end of the cover 7 and the annular step of the blind hole 2 forming the depth stop 6, which holds the piston 4 in the blind hole 2. The extension 5 of the piston 4 projects through the perforated disc 10. The end edge 9 at the open end of the cover 7 is also referred to here as the front end edge 9 or, in a direction of insertion of the cover 7 into the receptacle 8 of the hydraulic block 1 forming the housing 3, as the front end edge 9 of the cover 7.

[0020] At some distance from the front edge 9, the cover 7 has a circumferential groove 11 on the outside. The distance of the groove 11 from the front edge 9 is a few millimeters, or a fraction of the diameter of the cover 7.

[0021] Opposite the groove 11 of the cover 7, the receptacle 8 for the cover 7 also has a circumferential groove 12 in an inner peripheral wall 13. The groove 12 in the inner peripheral wall 13 of the receptacle 8 is slightly offset from the groove 11 on the outside of the cover 7 in the direction of the depth stop 6, but in such a way that the two grooves 11, 12 overlap each other.

[0022] A radially resilient connecting ring 14 is arranged in the grooves 11, 12. This resilient connecting ring engages both inwardly in the groove 11 of the cover 7 and outwardly in the groove 12 in the inner circumferential wall 13 of the receptacle 8, thereby holding the cover 7 in the receptacle 8. The connecting ring 14 is a circular ring open at one circumferential point with a circular cross-section, although other open or closed connecting rings are possible. The connecting ring 14 can have a cross-section other than circular and / or can have a radial corrugation running in a circumferential direction for radial resilience (not shown).

[0023] As is particularly evident in the enlargement of the Figure 2As can be seen, a front groove flank 15 of the groove 11 on the outside of the cover 7 in the direction of insertion of the cover 7 into the receptacle 8 of the hydraulic block 1 forming the housing 3 of the combination according to the invention and a rear groove flank 16 of the groove 12 in the inner circumferential wall 13 of the receptacle 8 in the direction of insertion are truncated cone surfaces, i.e. the groove flanks 15, 16 of the grooves 11, 12 of the cover 7 and the receptacle 8 for the cover 7 run obliquely from the inside to the outside in the direction of insertion. The front groove flank 15 of the groove 11 of the cover 7 in the direction of insertion of the cover 7 into the receptacle 8 is located on a side of the groove 11 near the front end edge 9 at the open end of the cover 7. The rear groove flank 16 of the groove 12 in the inner peripheral wall 13 of the receptacle 8 is located on a side of the groove 12 near the mouth of the receptacle 8.The groove flanks 15, 16 of the grooves 11, 12 are the groove flanks 15, 16 against which the connecting ring 14 of the combination according to the invention rests when the cover 7 is subjected to release from the receptacle 8, for example by an internal pressure in the blind hole 2 and in the cover 7.

[0024] The truncated cone shape of the front groove flank 15 of the groove 11 on the outside in the cover 7 or the course of this groove flank 15 from the inside to the outside at an angle in the direction of insertion of the cover 7 into the receptacle 8 acts on the connecting ring 14 radially outwards in the sense of an expansion of the connecting ring 14 when the cover 7 is acted upon to be released from the receptacle 8. In the opposite direction, the truncated cone shape of the rear groove flank 16 of the groove 12 in the inner peripheral wall 13 of the receptacle 8 or the course of this groove flank 16 from the inside to the outside at an angle in the direction of insertion of the cover 7 into the receptacle 8 acts on the connecting ring 14 radially inwards in the sense of a reduction in diameter.Due to the opposing loading of the connecting ring 14 by the groove flanks 15, 16 of the grooves 11, 12 of the cover 7 and in the inner peripheral wall 13 of the receptacle 8, the connecting ring 14 is held in these two grooves 11, 12 in such a way that it projects into both grooves 11, 12 even at high pressure in the blind hole 2 and in the cover 7 and rests against both groove flanks 15, 16, so that the cover 7 is securely held in the receptacle 8.

[0025] The fastening of the cover 7 in the receptacle 8 of the hydraulic block 1 forming the housing 3 is non-detachable, i.e. the cover 7 can only be released from the receptacle 8 by damaging or destroying the receptacle 8 and / or the cover 7.

[0026] In addition, the frustoconical groove flanks 15, 16, which run diagonally from the inside to the outside in the direction in which the cover 7 is inserted into the receptacle 8, ensure that the front end edge 9 of the cover 7 rests against the perforated disc 10 and that the perforated disc 10 rests against the depth stop 6 of the receptacle 8 for the cover 7. This means that the frustoconical groove flanks 15, 16 ensure that the cover 7 is secured in the receptacle 8 without axial play, even with diameter tolerances of the cover 7 in the area of ​​the groove 11 and the receptacle 8.If the diameter of the cover 7 and / or the receptacle 8 is large due to tolerances, the front groove flank 15 of the groove 11 of the cover 7 widens the connecting ring 14 which is resilient in the radial direction, and if the diameter of the cover 7 and / or the receptacle 8 is small due to tolerances, the rear groove flank 16 of the groove 12 in the inner circumferential wall 13 of the receptacle 8 reduces the diameter of the connecting ring 14, so that the connecting ring 14 always projects into both grooves 11, 12 and the front end edge 9 of the cover 7 rests on the perforated disc 10 and the perforated disc 10 rests on the depth stop 6 in the receptacle 8.

[0027] The groove flanks 15, 16 of the two grooves 11, 12 have different angles, namely the front groove flank 15 of the groove 11 on the outside in the cover 7 is flatter, i.e. it has a more obtuse cone angle than the rear groove flank 16 of the groove 12 in the receptacle 8 for the cover 7. The different angles of the groove flanks 15, 16 of the two grooves 11, 12 are in Figure 2illustrated by the two dash-dotted surface lines 23, 24 of the groove flanks 15, 16. The flatter front groove flank 15 of the groove 11 on the outside in the cover 7 acts on the connecting ring 14 outwards, causing the connecting ring 14 to widen. If the connecting ring 14 has a circular ring cross-section, as in the embodiment shown and described, it can possibly roll on the inclined groove flanks 15, 16 of the two grooves 11, 12; otherwise, it slides on the groove flanks 15, 16 or it performs a combined sliding and rolling movement on the groove flanks 15, 16. As it widens, the connecting ring 14 moves outwards on the rear groove flank 16 of the groove 12 in the receptacle 8 for the cover 7. Because the groove flank 16 is inclined, the connecting ring 14 simultaneously moves axially deeper into the holder 8.Because the rear groove flank 16 of the groove 12 in the receptacle 8 is steeper than the likewise sloping front groove flank 15 of the groove 11 on the outside of the cover 7, the connecting ring 14 moves axially further relative to the receptacle 8 than relative to the cover 7 as it widens. This causes the cover 7 to move deeper into the receptacle 8 or forces the cover 7 into the receptacle 8. This ensures that the cover 7 fits in the receptacle 8 without play in the axial direction right from the start and when the blind hole 2 is depressurized.

[0028] The groove 12 in the receptacle 8 is so deep that the connecting ring 14 has sufficient radial play outwards for all tolerances of the receptacle 8, including its depth stop 6, the cover 7 in the area of ​​the fastening and the perforated disc 10, that it is spread open by an axial load on the cover 7 so far that it presses the cover 7 against the perforated disc 14 without axial play and the perforated disc 14 against the annular step forming the depth stop 6 of the receptacle 8.

[0029] Applying pressure or, in general, applying pressure in the sense of releasing the cover 7 from the receptacle 8 increases the effect: a force acting axially from the receptacle 8 and acting on the cover 7 presses the connecting ring 14 more strongly outwards via the inclined front groove flank 15 of the groove 11 on the outside of the cover 7 and against the likewise inclined rear groove flank 16 of the groove 12 in the receptacle 8, which, because it is steeper, exerts a greater axial pressure on the cover 7 into the receptacle 8. The axially play-free fit of the cover 7 in the receptacle 8 of the housing 3 or the hydraulic block 1 is guaranteed at any pressure.

[0030] The cover 7 clamps the perforated disc 10 securely between its front edge 9 and the annular step forming the depth stop 6. Even if the combination according to the invention were implemented without the perforated disc 10 between the cover 7 and the depth stop 6, the cover 7 would rest directly against the depth stop 6 without any axial play.

[0031] Roundings at transitions of the groove flanks 11, 12, 15, 16 to the groove bases of the two grooves 11, 12 have a radius at least as large as the ring cross-section of the connecting ring 14, so that the connecting ring 14 is not lifted off the groove flanks 11, 12, 15, 16.

[0032] To produce the combination according to the invention, the cover 7 is moved in the insertion direction, namely axially into the receptacle 8 of the hydraulic block 1 forming the housing 3, until the front end wall 9 of the cover 7 rests against the perforated disc 10 and the perforated disc 10 rests against the depth stop 6 of the receptacle 8. This movement can also be understood as inserting the cover 7 into the receptacle 8 of the housing 3. When inserting the cover 7 into the receptacle 8, the connecting ring 14 is located in the groove 11 of the cover 7. It reaches, as in Figure 3 As can be seen, it rests against an insertion bevel 17, by which it is pressed together until its outer diameter is as large as a diameter of the inner peripheral wall 13 of the receptacle 8, whereby the connecting ring 14 can be pushed into the receptacle 8. The insertion bevel 17 is a chamfer, i.e. a frustoconical surface at a transition from the receptacle 8 to an outer surface of the hydraulic block 1.

[0033] The circumferential groove 11 on the outside of the cover 7 is at least as deep as the diameter of the annular cross-section of the connecting ring 14. If the connecting ring 14 has a cross-section other than circular, the groove 11 on the outside of the cover 7 is at least as deep as the width of the annular cross-section of the connecting ring 14 in the radial direction. This allows the connecting ring 14 to be completely countersunk into the groove 11 in the cover 7, so that it can be pushed into the receptacle 8 in the hydraulic block 1 forming the housing 3.

[0034] It is also possible to arrange the connecting ring 14 in order to produce the combination according to the invention in the groove 12 in the inner peripheral wall 13 of the receptacle 8. In this case, the insertion bevel is arranged on the front end edge 9 of the cover 7 and the groove 12 in the inner peripheral wall 13 of the receptacle 8 is at least as deep as the diameter or the width of the ring cross-section of the connecting ring 14 (not shown), so that the insertion bevel in this case of the cover 7 presses the connecting ring 14 into the groove 12 in the inner peripheral wall 13 of the receptacle 8 and the cover 7 can be pushed into the connecting ring 14 in the groove 12 in the inner peripheral wall 13 of the receptacle 8.

[0035] When the grooves 11, 12 of the cover 7 and the receptacle 8 reach each other when the cover 7 is inserted into the receptacle 8, the connecting ring 14 springs up so that it projects into both grooves 11, 12 and fastens the cover 7 in the receptacle 8 and thus connects it to the hydraulic block 1 forming the housing 3.

[0036] A rear groove flank 18 of the groove 11 of the cover 7 in the insertion direction is a radial surface, i.e., it runs perpendicular to the insertion direction so that it pushes the connecting ring 14 into the receptacle 8 when the cover 7 is inserted into the receptacle 8. A front groove flank 19 of the groove 12 in the inner peripheral wall 13 of the receptacle 8 in the insertion direction is also a radial surface running perpendicular to the insertion direction.

[0037] On a side of the groove 11 facing away from the front edge 9 of the cover 7, the cover 7 has a further circumferential groove on the outside, which is referred to here as a sealing groove 20. A sealing ring 21 is arranged in the sealing groove 20, which seals between the cover 7 and the receptacle 8 of the hydraulic block 1 forming the housing 3. In the illustrated and described embodiment, the sealing ring 21 is an O-ring, but other sealing rings such as a quad ring or a ring with a square or rectangular cross-section can also be used. As in Figure 4 As can be seen, when the cover 7 is inserted into the receptacle 8, the sealing ring 21 is pressed into the sealing groove 20 by the insertion bevel 17, so that it comes into sealing contact with the inner peripheral wall 13 of the receptacle 8.

[0038] The inner peripheral wall 13 of the receptacle 8 is cylindrical and coaxial with the blind hole 2 in the hydraulic block 1 and with the cover 7. The inner peripheral wall 13 thus runs in the direction of insertion of the cover 7 into the receptacle 8.

[0039] The hydraulic block 1 is a cuboid metal block made of an aluminum alloy, although manufacture from metal is not mandatory for the invention. The hydraulic block 1 serves for the mechanical attachment and hydraulic interconnection of components of the brake pressure control of the hydraulic vehicle brake system (not shown). The brake pressure control can be a control of a hydraulic brake pressure, including the generation of the hydraulic brake pressure during external power braking, and / or a slip control, wherein for slip control, wheel brake pressures are preferably controlled individually in hydraulic wheel brakes. Slip control systems include anti-lock control, traction control, and vehicle dynamics control, which is also referred to as an electronic stability program and colloquially as anti-skid control. The abbreviations ABS, ASR, FDR or ESP are commonly used for these systems.Such brake pressure controls are known and are not explained here.

[0040] Hydraulic components for brake pressure control include solenoid valves, check valves, hydraulic pumps, hydraulic accumulators, damper chambers, pedal travel simulators, and pressure sensors. This list is not necessarily exhaustive. Equipped with these components, the hydraulic block forms a hydraulic unit for brake pressure control of the hydraulic vehicle brake system (not shown).

[0041] "Hydraulic interconnection" means a hydraulic connection of the components according to a hydraulic circuit diagram of the brake pressure control.

[0042] The combination according to the invention is not only possible for the cover 7 of the pedal travel simulator, but in principle enables the fastening of any cover 7 or generally of a component in the receptacle 7 of the hydraulic block 1, the housing 3 or generally of any other component. Figure 5 shows a Figure 1 corresponding axial section of an embodiment of the invention without the piston 4, the perforated disc 10 and the disc spring assembly 22. The cover 7 is as above to Figures 1 and 2 explained with the connecting ring 14 in the receptacle 8 of the housing 3 or hydraulic block 1. In this embodiment of the invention, the cover 7 is not mechanically acted upon by the disc spring assembly 22 or, when the piston 4 is in contact with the perforated disc 10, mechanically by the perforated disc 10, but hydraulically by a hydraulic pressure prevailing in the blind hole 2, which the cover 7 closes, and in the cover 7. The connecting ring 14 holds, as shown Figures 1 and 2explains the cover 7 axially free of play against the hydraulic pressure prevailing in it in the receptacle 8 of the hydraulic block 1 forming the housing 3.

[0043] The front edge 9 at the open end of the lid 7 made of Figure 5 has no ring step for the perforated disc 10, which it Figure 5 does not exist, but the front edge 9 of the cover 7 lies directly against the annular step forming the depth stop 6 in the receptacle 8 for the cover 7. As explained, when hydraulic pressure is applied to the cover 7 from the inside, the connecting ring 14 presses the cover 7 with the front edge 9 against the annular step forming the depth stop 6 in the receptacle 8 without axial play.

Claims

1. Combination of a cover (7) and a housing (3), wherein, for fastening of the cover (7) to the housing (3), the housing (3) has a depression as a receptacle (8) for the cover (7), into which the cover (7) is introduced in a direction of introduction, wherein an inner circumferential wall (13) of the depression of the housing (3) that forms the receptacle (8) extends in the direction of introduction, wherein the cover (7), at the outside, and the receptacle (8), in the inner circumferential wall (13), have a respective encircling groove (11, 12), in which grooves there lies a radially resilient connecting ring (14) which projects inwards into the encircling groove (11) of the cover (7) and outwards into the encircling groove (12) in the inner circumferential wall (13) of the receptacle (8) of the housing (3) for the cover (7) and as a result connects the cover (7) to the housing (3), characterized in that a front groove flank (15) in the direction of introduction of the groove (11) of the cover (7) and a rear groove flank (16) in the direction of introduction of the groove (12) in the inner circumferential wall (13) of the receptacle (8) of the housing (3) for the cover (7) extend from the inside outwards obliquely in relation to the direction of introduction, wherein the front groove flank (15) in the direction of introduction of the groove (11) of the cover (7) has a larger cone angle than the rear groove flank (16) in the direction of introduction of the groove (12) in the inner circumferential wall (13) of the receptacle (8) of the housing (3) for the cover (7).

2. Combination according to Claim 1, characterized in that the receptacle (8) of the housing (3) for the cover (7) has a depth stop (6) which limits a depth of introduction of the cover (7) into the receptacle (8) of the housing (3).

3. Combination according to Claim 2, characterized in that the receptacle (8) of the housing (3) has, as a depth stop (6) for the cover (7), a step projecting inwards from its inner circumferential wall (14).

4. Combination according to one or more of the preceding claims, characterized in that a rear groove flank (18) in the direction of introduction of the groove (11) of the cover (7) and / or a front groove flank (19) in the direction of introduction of the groove (12) in the inner circumferential wall (13) of the receptacle (8) of the housing (3) for the cover (7) extend(s) perpendicularly to the direction of introduction.

5. Combination according to one or more of the preceding claims, characterized in that the radially resilient connecting ring (14) is open at a circumferential position and / or has a round ring cross section.

6. Combination according to one or more of the preceding claims, characterized in that the cover (7), at the outside, and / or the receptacle (8) of the housing (3) for the cover (7) have / has a sealing groove (20) in which a sealing ring (21) is arranged.

7. Combination according to one or more of the preceding claims, characterized in that the depth of the groove (11) on the outside of the cover (7) and / or the depth of the groove (12) in the inner circumferential wall (13) of the receptacle (8) of the housing (3) for the cover (7) are / is at least equal to a radial width of a ring cross section of the connecting ring (14), so that the connecting ring (14) can be sunk into the groove (7, 8).

8. Combination according to one or more of the preceding claims, characterized in that the cover (7), at a transition from a front end edge (9) in the direction of introduction to an outer circumference, and / or the receptacle (8) of the housing (3) for the cover (7), at a mouth of the receptacle (8), have / has an introduction bevel (17) which, during the introduction of the cover (7) into the receptacle (8) of the housing (3), pushes the connecting ring (14) into the groove (11) of the cover (7) or into the groove (12) in the inner circumferential wall (13) of the receptacle (8).

9. Combination according to one or more of the preceding claims, characterized in that the housing (3) is a hydraulic block (1) of a brake pressure control system of a hydraulic vehicle brake system.