Hydraulic assembly, housing assembly for hydraulic assembly, and method for producing housing assembly

Abstract

A housing assembly for a hydraulic assembly, the housing assembly comprising a housing portion at least partially defining an interior volume and having a through bore extending between an inner surface of the housing portion facing the interior volume and an outer surface oriented opposite the inner surface, a region of the inner surface surrounding the through hole forms a recess. Further, the housing assembly includes: a tie rod extending with an inner section in the inner volume of the housing portion and protruding through the through hole such that an outer section of the tie rod protrudes beyond the outer surface of the housing portion; the pull rod nut is in threaded connection with the inner section of the pull rod and is provided with a sealing surface; and a sealing element which is arranged in the recess and rests against the inner section of the pull rod, the region of the inner surface surrounding the through-hole, and the sealing surface of the pull rod nut.

Description

Technical Field

[0001] The invention relates to a hydraulic component, in particular for a hydraulic brake system, a housing component for the hydraulic component and a method for producing a housing component. Background Art

[0002] Brake boosters, such as electric brake boosters, are often used in hydraulic brake systems of vehicles. The functional principle of such brake boosters is based on the fact that the force applied to an actuating device, such as a pedal, is amplified by actuating a hydraulic pressure generating device, such as a master brake cylinder, by means of an electric motor via a transmission. In this case, an actuating assembly coupled to the pressure generating device is usually linearly adjusted by a transmission, wherein the actuating assembly is accommodated in a housing part and is mounted in a linearly displaceable manner on at least one tie rod arranged in the housing part.

[0003] Patent document DE 10 2020 206 337 A1 describes a hydraulic assembly having a housing assembly and a master brake cylinder as a hydraulic device. The housing assembly has a housing part and a tie rod extending through an opening of the housing part. The hydraulic device is mounted on the outside of the housing part, wherein the tie rod protrudes through a hole in a flange of the hydraulic device. A sealing element for sealing the housing is arranged between the flange and the outer surface of the housing in order to seal the opening of the housing part in a liquid-tight manner. On the inner side of the housing, a flat tie rod nut is screwed together with the tie rod to fix it. As a result, the tie rod nut has a short structural length, so that a long guide surface is obtained on the tie rod, so as to achieve a sufficient stroke length of the operating assembly guided on the tie rod within a limited structural length. If the hydraulic device is removed from the housing assembly, for example for maintenance or replacement, it is necessary to replace the sealing element. Summary of the invention

[0004] According to the invention, a housing assembly having the features of claim 1 , a hydraulic assembly having the features of claim 9 and a method having the features of claim 10 are proposed.

[0005] According to a first aspect of the invention, a housing assembly for a hydraulic assembly comprises a housing part, which at least partially delimits an inner volume and has a through hole, which extends between an inner surface of the housing part facing the inner volume and an outer surface oriented opposite to the inner surface, wherein a region of the inner surface surrounding the through hole forms a recess. In addition, the housing assembly comprises: a tie rod, which extends with an inner section in the inner volume of the housing part and protrudes through the through hole, so that an outer section of the tie rod protrudes beyond the outer surface of the housing part; a tie rod nut, which is threadedly connected to the inner section of the tie rod and has a sealing surface; and a sealing element, which is arranged in the recess and abuts against the inner section of the tie rod, the region of the inner surface surrounding the through hole, and the sealing surface of the tie rod nut.

[0006] According to a second aspect of the present invention, a hydraulic assembly is provided, in particular a hydraulic assembly for a hydraulic brake system. The hydraulic assembly comprises a housing assembly according to the first aspect of the present invention and a hydraulic device having a flange, on which a hole is formed. An outer section of a tie rod protrudes through the hole of the flange, and the hydraulic device is fixed to the housing assembly by the tie rod.

[0007] According to a third aspect of the present invention, a method for manufacturing a housing assembly according to the first aspect of the present invention is provided. The method comprises: arranging a sealing element in a recess of a housing part; guiding a tie rod through a through hole of the housing part; screwing a tie rod nut onto the tie rod; and bringing the sealing element into contact with a sealing surface of the tie rod nut, a region of the inner surface surrounding the through hole, and an inner section of the tie rod.

[0008] The idea underlying the invention is that, in a housing assembly for a hydraulic assembly, a recess is provided on the inner surface, in the region surrounding a through hole, and a sealing element assigned to the tie rod is arranged in the recess. In this way, the sealing element abuts against the outer circumferential surface of the tie rod extending through the through hole, the inner surface of the housing part, and the sealing surface of a tie rod nut, which is threadedly connected to the tie rod in the interior space of the housing.

[0009] By forming the recess on the inner side of the housing part, the space required for the sealing element in the inner space of the housing part is reduced. Therefore, although the sealing element is arranged in the inner space, the stroke length of the component guided on the tie rod (for example, the sliding bearing of the operating assembly of the brake booster) can be extended. At the same time, the hydraulic device mounted on the tie rod on the outer side of the housing part can be replaced or disassembled and reassembled without replacing the sealing element. Therefore, the sealing element seals the through-hole in a liquid-tight manner, in particular even when the hydraulic device is disassembled and reassembled or replaced. The sealing element is thus protected from damage in an improved manner.

[0010] Advantageous embodiments and developments emerge from the further dependent claims and from the description with reference to the figures in the drawing.

[0011] According to some embodiments, it can be provided that the through-opening is designed to be circular and the recess has a conical section.

[0012] According to some embodiments, it can be provided that the housing part is deformed in the area around the through hole so that a recess is formed on the inner surface and a corresponding protrusion is formed on the outer surface. For example, the housing part can have a substantially flat, in particular plate-shaped cover section, on which a through hole is formed, wherein the cover section is deformed so that the area around the through hole forms a recess on the inner surface and a protrusion or protrusion is formed on the outer surface. For example, the housing part, in particular the cover section, can be formed from a metal sheet, wherein the recess and the protrusion are produced by a press forming process. Optionally, the housing part can have a constant thickness in the area where the recess and the protrusion are formed. In addition to the recess, a protrusion is also provided, which makes manufacturing simpler and at the same time increases the torsional rigidity of the housing part. In addition, the recess around the hole can be formed on the flange of the hydraulic device, for example in the form of a chamfer (bevel) to accommodate the protrusion.

[0013] According to some embodiments, it can be provided that the recess has a depth in the range between 1 mm and 4 mm. In particular, the recess can have a depth in the range between 1.5 mm and 3.5 mm. Within this range, the available stroke on the tie rod is significantly extended, wherein at the same time the dimensions of the sealing element can be designed to be relatively large, which further improves the sealing effect.

[0014] According to some embodiments, it can be provided that the tie rod nut has an inner hole with an internal thread, which is threadedly connected to an external thread formed on the inner section of the tie rod, wherein the sealing surface of the tie rod nut extends at least partially spaced apart from the end of the external thread facing the outer section of the tie rod. As a result, the area of ​​the sealing surface of the tie rod nut, against which the sealing element abuts, is spaced apart from the external thread of the tie rod. In this way, the sealing element is better protected from damage and the sealing effect is further improved.

[0015] According to some embodiments, it can be provided that the internal thread of the tie rod nut has an overlap with the external thread of the tie rod in the range of between 60% and 95% with respect to the total thread length of the internal thread. This means that the nut is screwed beyond the end of the external thread of the tie rod so that the end of the outer section of the nut facing the tie rod is spaced apart from the end of the external thread. This additionally ensures that the sealing element is not damaged by the external thread of the tie rod. At the same time, a relatively large friction surface between the threads is achieved in this overlapping area, which makes it easier to selectively prevent the tie rod nut from rotating.

[0016] According to some embodiments, it can be provided that the inner hole protrudes beyond the end of the outer thread in the direction of the outer section of the tie rod, and the sealing surface of the tie rod nut is formed on the inner hole of the tie rod nut. For example, the tie rod nut can bear against the inner surface of the housing part with the end face, and the sealing surface arranged in the inner hole bears against the sealing element. This facilitates a defined positioning of the tie rod nut and the tie rod relative to the housing part.

[0017] According to some embodiments, it can be provided that the sealing surface of the tie rod nut is designed as a chamfer on the inner hole of the tie rod nut. The angled extension of the sealing surface thus ensures that forces in the axial direction (i.e. forces along the tie rod) and in the radial direction (i.e. in a direction transverse to the tie rod) are applied to the sealing element. The sealing element is thus pressed against the inner surface of the housing part and the outer circumference of the tie rod in a further improved manner.

[0018] According to some embodiments, it can be provided that the tie rod nut is fixed on the tie rod to prevent relative rotation, in particular by a crimping connection to prevent relative rotation. Therefore, the method may include fixing the tie rod nut threadedly connected to the tie rod on the tie rod to prevent relative rotation. For example, the tie rod nut may be provided with an outer hexagon on its outer circumference, at least two, preferably three sides of the outer hexagon are plastically extruded in the radial direction so as to achieve plastic deformation of at least the internal thread and, optionally, the external thread of the tie rod. The advantage of this connection, which is called crimping, is that there is no need to insert additional components to fix the nut, while providing a reliable anti-rotation portion. Alternatively, other anti-rotation devices may also be provided.

[0019] According to some embodiments, it may be provided that the sealing element is designed in an annular shape. For example, the sealing element may be designed as an O-ring.

[0020] According to some embodiments, it can be provided that the hydraulic device is constructed in the form of a hydraulic pressure generating device. For example, the hydraulic device can be a tandem master brake cylinder, a plunger, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is explained below with reference to the accompanying drawings. In the accompanying drawings:

[0022] Figure 1 shows a schematic cross-sectional view of a hydraulic assembly according to an embodiment of the present invention;

[0023] Figure 2 A perspective view showing the outside of a housing portion of a housing assembly according to an embodiment of the present invention;

[0024] Figure 3 Shows Figure 1 a detailed view of the area of ​​the hydraulic assembly shown marked by the letter X; and

[0025] Figure 4A flow chart of a method for manufacturing a housing assembly according to an embodiment of the present invention is shown.

[0026] In the figures, unless otherwise indicated, the same reference signs denote identical or functionally identical components. DETAILED DESCRIPTION

[0027] Figure 1 The sectional view of the hydraulic assembly 200 is schematically shown. The hydraulic assembly 200 has a housing assembly 100 and a hydraulic device 210. The hydraulic assembly 200 may be used as a component in an electric motor brake booster of a vehicle, for example, or such a brake booster may have the hydraulic assembly 200.

[0028] The hydraulic device 210 Figure 1 2 and has a flange 212 in which at least one hole 214 is formed. The hydraulic device 210 can be, for example, a hydraulic pressure generating device, such as a master brake cylinder, in particular a tandem master brake cylinder, a plunger, etc. The hydraulic device 210 can be mechanically actuated, in particular, by means of an actuating assembly 220. The actuating assembly 220 is Figure 1 The hydraulic device 210 is also only partially shown and can have, for example, a connecting arm 221 shown by way of example and a sliding bearing 222 connected to the connecting arm 221. The connecting arm 221 can be linearly moved by means of an electric motor (not shown) for actuating the hydraulic device 210, which is kinematically coupled to the actuating assembly, for example, via a transmission (not shown).

[0029] like Figure 1 As shown, the housing assembly 100 has a housing part 1 , a tie rod 2 , a tie rod nut 3 and a sealing element 4 .

[0030] The housing part 1 is Figure 1 Only partially shown. Figure 2 Schematically, a partial perspective view of the housing part 1 is shown. Typically, the housing part 1 at least partially defines or delimits an interior volume 10. Figure 1 and Figure 2 As shown by way of example, the housing part 1 can, for example, have a substantially flat or plate-shaped cover section 14 and a circumferential (peripheral) section 16 extending transversely to the cover section. Typically, the housing part 1 has an inner surface 1i facing the inner volume 10 or defining the inner volume 10 and an outer surface 1a oriented opposite to the inner surface. Figure 1 and Figure 2As further shown, the housing part 1 has a through hole 11, which extends between the inner surface 1i and the outer surface 1a of the housing part 1 and which can be formed in particular in the cover section 14. The through hole 11 can in particular have a circular circumference. In addition, a central connecting opening 18 can be formed in the cover section 14, which extends between the inner surface 1i and the outer surface 1a of the housing part 1 and is used to accommodate an operating interface of the hydraulic device 210. The housing part 1 can be formed, for example, from a metal material, in particular a metal sheet. However, the present invention is not limited thereto.

[0031] like Figure 1 As shown, the area of ​​the inner surface 1i surrounding the through hole 11 forms a recess 12. Therefore, the through hole 11 is disposed or arranged on the bottom or base 12B of the recess 12 formed on the inner surface 1i. Figure 1 and Figure 3 As shown, the recess 12 may have a conical section 12A. The opening angle of the conical section 12A may be, for example, in the range between 70 degrees and 90 degrees. Further optionally, the recess 12 may have a substantially flat bottom section 12B in which the recess 12 is formed. Figure 2 As shown by way of example, the housing part 1 may also have a protrusion 13 on the outer surface 1a in the area surrounding the through hole 11. Figure 1 As shown schematically, the housing part 1 can thus be deformed such that a recess 12 is formed on the inner surface 1i and a corresponding, complementary protrusion 13 is formed on the outer surface 1a. The recess 12 can, for example, have a depth t12 ( Figure 3 ).

[0032] The pull rod 2 is configured as a rod-shaped elongated member extending along the longitudinal axis A2. Figure 1 As shown, the tie rod 2 extends in the inner volume 10 and extends through the through hole 11. The area of ​​the tie rod 2 located in the inner volume 10 forms the inner section 2A, and the area of ​​the tie rod 2 defined outside the outer surface 1a of the housing part 1 forms the outer section 2B of the tie rod 2. Therefore, the tie rod 2 extends transversely to the cover section 14. The outer section 2B of the tie rod 2 protrudes beyond the outer surface 1a of the housing part 1, in particular the cover section 14.

[0033] like Figure 1 As shown, the inner section 2A of the tie rod 2 can have an external thread 20 in the area close to the through hole 11. In addition, the tie rod 2 can have a guide section 22 on its inner section 2A, on which the sliding bearing 222 is guided linearly or displaceably along the longitudinal axis A2. The outer section 2B of the tie rod 2 simultaneously forms the end section of the tie rod and can also be optionally provided with an external thread 24. Figure 1It can be seen that the diameter of the outer section 2B can be smaller at least in places, in particular in the region of the thread 24 , than the diameter of the inner section 2A in the region of the thread 20 .

[0034] The tie rod nut 3 is configured as a screwable sleeve. Therefore, the tie rod nut 3 has an inner hole 30 with an inner thread 31. In addition, the tie rod nut 3 has a sealing surface 3a, which can be arranged on the inner hole 30, for example. Figure 1 and Figure 3 As shown in the exemplary embodiment, the sealing surface 3a can be formed, for example, as a chamfer 32 on the inner hole 30 of the tie rod nut 3. Therefore, the chamfer 32 defines a conical contact surface or sealing surface 3a, which can have an opening angle in the range of 100 degrees to 140 degrees, for example. In addition, the tie rod nut 3 can optionally be provided with an outer hexagon on its outer circumference.

[0035] like Figure 1 As shown schematically, the tie rod nut 3 is threadedly connected to the outer thread 20 of the tie rod 2 arranged on the inner section 2A. Optionally, the tie rod nut 3 can be fixed to the tie rod 2 in a rotationally fixed manner, in particular by a crimping connection. To this end, the outer circumference of the tie rod nut 3 can have at least one plastic deformation in the form of a recess 34, which causes a plastic deformation 35 on the inner thread 31. Figure 1 As can be further seen, the tie rod nut 3 rests with its end face 3 b against the inner surface 1 a of the housing part 1 .

[0036] like Figure 1 As further shown, the outer section 2B of the tie rod 2 protrudes through the hole 214 of the flange 212. In order to fix the flange 212 on the housing part 1, an external nut 216 can be provided, which is screwed to the external thread 24 of the outer section 2B of the tie rod 2 and clamps the flange 212 between itself and the housing part 1, in particular its cover section 14. Optionally, the external nut 216 can also be prevented from rotating by a crimped connection with the tie rod 2. Figure 1 It can also be seen that the flange 212 can have a recess 215 on the contact surface 212a facing the housing part 1 in the area around the hole 214, in which the optional protrusion 13 of the housing part 1 is accommodated. However, the recess 215 can also be provided independently of the protrusion of the housing part 1.

[0037] The sealing element 4 can be designed in an annular shape, for example, as an O-ring. Figure 1 and Figure 3 As shown in the example. Figure 1 As shown, the sealing element 4 is arranged in a recess 12 on the inner surface 1i of the housing part 1 and thus surrounds the through hole 11. In addition, the sealing element 4 surrounds the inner section 2A of the tie rod 2 and contacts the sealing surface 3a of the tie rod nut 3. In particular, Figure 3As can be seen in FIG, the sealing element 4 is therefore located in the recess 12 on the inner surface 1i of the housing part 1, on the outer circumference of the tie rod 2 and on the sealing surface 3a of the tie rod nut 3. The sealing element 4 thus seals the through-opening 11 in a liquid-tight manner, for example to prevent liquid from escaping from the interior volume 10 or to prevent liquid from penetrating into the interior volume 10. The sealing element 4 is squeezed or compressed in particular between the sealing surface 3a of the tie rod nut 3 and the region of the inner surface 1i forming the recess 12. Figure 3 In FIG. 4 , the sealing paths sealed by the sealing element 4 are shown by arrows P1 and P2 .

[0038] By arranging the sealing element 4 in the recess 12 on one side of the inner surface 1i of the housing part 1, the space required for the sealing element 4 in the inner volume 10 relative to the longitudinal axis L1 is reduced. As a result, the guide section 22 of the tie rod 2 can be relatively close to the inner surface 1i of the housing part 1 or the cover section 14 in the axial direction. As a result, the stroke, i.e. the distance that the sliding bearing 222 can travel on the tie rod 2, can be effectively extended. Arranging the sealing element 4 in the recess 12 on one side of the inner surface 1i of the housing part 1 also provides the advantage that the sealing element 4 is well protected from external influences. In particular, when the hydraulic device 210 is flanged again or a new hydraulic device 210 is installed, the hydraulic device 210 can be removed without damaging the sealing element 4 and / or without the need to replace the sealing element 4.

[0039] like Figure 1 and Figure 3 As shown in the exemplary embodiment, the tie rod nut 3 can be positioned relative to the tie rod 2 so that the sealing surface 3a of the tie rod nut 3 at least partially extends spaced apart from the end of the external thread 20 facing the outer section 2B of the tie rod 2. Figure 3 As can be seen in the drawing, for example, the inner hole 30 of the tie rod nut 3 can be arranged so that in this case the conical sealing surface 3a protrudes beyond the end of the external thread 20 of the tie rod 2. This can reliably prevent the sealing element 4 from being damaged by the external thread 20.

[0040] Figure 4 The flow of a method M for manufacturing a housing component 100 is schematically shown. The method M is explained below by way of example with reference to the housing component 100 described above. The method M comprises a step M1 of arranging a sealing element 4 in a recess 12 of a housing part 1 and a step M2 of passing a tie rod 2 through a through hole 11 of the housing part 1, in particular such that the external thread 20 and the guide section 22 are positioned in the inner volume 10 of the housing part 1. Steps M1 and M2 can in particular be performed in such a way that the sealing element 4 is pushed onto the tie rod 2 and positioned in the recess by passing the tie rod 2 through the through hole 11. Alternatively, however, the sealing element 4 can first be positioned in the recess 12 and then in step M2 the tie rod 2 can be pushed through the sealing element 4.

[0041] In a further step M3, the tie rod nut 3 is screwed onto the tie rod 2 as described above. The screwing M2 can be performed before or after the tie rod 2 is passed through the through hole 11 (step M2).

[0042] In addition, step M4 is performed to bring the sealing element 4 into contact with the sealing surface 3a of the tie rod nut 3, the area of ​​the inner surface 1i surrounding the through hole 11, and the inner section 2A of the tie rod 2. Step M4 can be performed simultaneously with the execution of steps M1 to M3. For example, the contact of the sealing element 4 with the inner section 2A of the tie rod 2 can be performed during step M2. The contact of the sealing element 4 with the sealing surface 3a of the tie rod nut 3 and the area of ​​the inner surface 1i surrounding the through hole 11 can be completed, for example, by screwing in step M3.

[0043] Furthermore, an additional step M5 can optionally be provided, in which the tie rod nut 3 is fixed to the tie rod in a rotationally fixed manner (for example by crimping).

[0044] Although the present invention has been exemplarily explained above using the embodiments, the present invention is not limited thereto but can be modified in various ways. In particular, combinations of the above embodiments are also conceivable.

Claims

1. A housing assembly (100) for a hydraulic assembly (200), the housing assembly comprising: A housing part (1) at least partially delimiting an inner volume (10) and having a through hole (11) extending between an inner surface (1i) of the housing part (1) facing the inner volume (10) and an outer surface (1a) oriented opposite to the inner surface, wherein a region of the inner surface (1i) surrounding the through hole (11) forms a recess (12); a tie rod (2), which extends with an inner section (2A) in the inner volume (10) of the housing part (1) and projects through the through hole (11), so that an outer section (2B) of the tie rod (2) projects beyond the outer surface (1a) of the housing part (1); a tie rod nut (3) which is threadedly connected to the inner section (2A) of the tie rod (2) and has a sealing surface (3a); and A sealing element (4) is arranged in the recess (12) and abuts against an inner section (2A) of the tie rod (2), a region of the inner surface (1i) surrounding the through hole (11) and a sealing surface (3a) of the tie rod nut (3).

2. The housing assembly (100) according to claim 1, wherein: The housing part (1) is deformed in a region surrounding the through-opening (11) so that the recess (12) is formed on the inner surface (1i) and a corresponding projection (13) is formed on the outer surface (1a).

3. The housing assembly (100) according to claim 1 or 2, wherein: The recess (12) has a depth (t12) in the range between 1 mm and 4 mm.

4. The housing assembly (100) according to any one of the preceding claims, wherein: The tie rod nut (3) has an inner hole (30), the inner hole has an internal thread (31), and the internal thread (31) is threadedly connected to an external thread (20) formed on an internal section (2A) of the tie rod (2), wherein the sealing surface (3a) of the tie rod nut (3) extends at least partially separated from the end of the external thread (20) facing the external section (2B) of the tie rod (2).

5. The housing assembly (100) according to claim 4, wherein: The inner hole (30) protrudes beyond the end of the external thread (20) in the direction of the outer section (2B) of the tie rod (2), and the sealing surface (3a) of the tie rod nut (3) is formed on the inner hole (30) of the tie rod nut (3).

6. The housing assembly (100) according to claim 5, wherein: The sealing surface (3a) of the tie rod nut (3) is configured as a chamfer (32) on the inner hole (30) of the tie rod nut (3).

7. The housing assembly (100) according to any one of the preceding claims, wherein: The tie rod nut (3) is fixed on the tie rod (2) to prevent relative rotation, in particular, to prevent relative rotation through a crimping connection.

8. The housing assembly (100) according to any one of the preceding claims, wherein: The sealing element (4) is designed to be annular, in particular to be designed as an O-ring.

9. A hydraulic assembly (200), in particular a hydraulic assembly for a hydraulic brake system, the hydraulic assembly comprising: The housing assembly (100) according to any one of the preceding claims; as well as a hydraulic device (210), in particular in the form of a pressure generating device, having a flange (212) in which a hole (214) is formed; The outer section (2B) of the tie rod (2) protrudes through the hole (214) of the flange (212) and the hydraulic device (210) is fixed to the housing assembly (100) via the tie rod (2).

10. A method (M) for manufacturing a housing assembly (100) according to any one of claims 1 to 8, the method comprising: Arranging (M1) the sealing element (4) in a recess (12) of the housing part (1); guiding the pull rod (2) to pass through (M2) the through hole (11) of the housing part (1); Screwing (M3) the tie rod nut (3) onto the tie rod (2); and The sealing element (4) is brought into contact (M4) with the sealing surface (3a) of the tie rod nut (3), the area of ​​the inner surface (1i) surrounding the through hole (11), and the inner section (2A) of the tie rod (2).

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