Housing assembly for a brake booster having an electric motor and method for producing such a housing assembly

Abstract

The invention relates to a housing assembly (1), comprising a first housing (3) in which an electric machine (7) can be or is arranged, an end shield (9) for the electric machine (7), which end shield is arranged in a first recess (5) of the first housing (3), and a second housing (4) having a second recess (6), wherein the housings (3, 4) can be or are sealingly connected to one another in the region of the respective recesses (5, 6) thereof. According to the invention, a cavity (17) for receiving an, in particular silicone-based, sealant (18) between the end shield (9) and the first housing (3) is formed at least in regions on or in a surface (15) of an outer edge (16) of the end shield (9) facing the second housing (4).

Description

[0001] Description

[0002] title

[0003] Housing arrangement for a brake booster with an electric motor and method for producing such a housing arrangement

[0004] The invention relates to a housing arrangement, comprising a first housing in which an electrical machine can be arranged or is arranged, comprising a bearing plate for the electrical machine arranged in a first recess of the first housing, and comprising a second housing having a second recess, wherein the housings can be or are connected to one another in a sealing manner in the region of their respective recess.

[0005] Furthermore, the invention relates to a brake force generator with such a housing arrangement, as well as a method for producing such a housing arrangement.

[0006] State of the art

[0007] Housing assemblies of the type mentioned above are known from the prior art. For example, such housing assemblies are known for brake force generators of motor vehicle brake systems, in which a sealing agent is used between a motor housing of an electric motor and a bearing plate arranged therein, as well as a housing of the brake force generator connected to the motor housing, in which, for example, a gear assembly connected to the electric motor and an actuating element of the brake force generator are arranged. The resulting sealing distance or sealing length is usually in the range of a few millimeters and is accordingly limited by the geometry of the two housings. Disclosure of the Invention

[0008] The housing arrangement according to the invention with the features of claim 1 is characterized in that a cavity for receiving a sealant, in particular a silicone-based sealant, is formed at least partially on or in a surface of an outer edge of the bearing plate facing the second housing between the bearing plate and the first housing. This advantageously extends the initially mentioned sealing length between the two housings while maintaining the same component size. By correspondingly redesigning the bearing plate (cavity), the sealing surface is enlarged without increasing the overall size of the housing arrangement. The sealant, for example liquid, can penetrate into the cavity, in particular flow into it, and thus improves the sealing effect. In this respect, corresponding sealing surfaces between the two housings are extended towards the bearing plate.The surface is preferably arranged in an edge region of the bearing plate associated with the second housing, in particular in the radial extension of the bearing plate. The cavity is preferably formed by a corresponding geometry of the surface. In particular, a further surface of the bearing plate, for example, adjacent to the surface of the outer edge, can be arranged or is arranged flush with a first sealing surface surrounding the first recess. The bearing plate is designed, in particular, to close the first housing and / or to accommodate a bearing element for a rotor shaft of the electric machine.

[0009] According to a preferred development of the invention, the first housing is at least substantially cylindrical, and the first recess is formed in an end face of the housing. Such a configuration of the housing and recess provides a particularly advantageous and simple way of connecting the two housings. The first housing is thus designed as a pole pot.

[0010] Particularly preferably, the first housing, with a first sealing surface surrounding the first recess, is flanged and / or screwed to a second sealing surface of the second housing surrounding the second recess. The corresponding connection of the housings to one another results in the advantage of further improving the sealing effect. The sealing surfaces surrounding the respective recesses are located opposite one another, so that the corresponding sealing means can be arranged between them.

[0011] According to a preferred development of the invention, the cavity is formed only in a region of the bearing plate assigned to a predetermined region of the first housing, in particular depending on a dimension of a first sealing surface surrounding the first recess. This creates a particularly advantageous possibility for compensating for a missing sealing length by means of the cavity. For example, the cavity is formed only in the region of the bearing plate in which the region of the first housing assigned to it falls below a predetermined minimum size, so that the minimum size of the sealing surface is at least achieved with the cavity as a whole.

[0012] Particularly preferably, the bearing plate is formed as a sheet metal part with at least a largely constant thickness and is pressed into the housing. This results in the advantage that the bearing plate is held particularly securely in the housing, and the cavity is particularly easy to manufacture.

[0013] According to a preferred embodiment of the invention, the bearing plate has an at least substantially circular outer contour, and the outer edge is a circumferential outer edge. A bearing plate designed in this way with a circumferential outer edge provides a particularly advantageous and simple way of machining the outer edge or its surface and producing the cavity.

[0014] It is particularly preferably provided that the cavity is formed by reshaping and / or primary shaping of the bearing plate in the region of the outer edge. This creates a particularly advantageous and simple way of producing the cavity. In particular, the bearing plate is correspondingly reshaped or primary shaped on an edge region facing the first housing. If, for example, the bearing plate has an at least substantially circular outer contour, as described above, the corresponding edge region is also a circumferential edge region and thus extends in the radial direction. To produce the cavity, the edge region does not have to be completely machined; reshaping or primary shaping at least in some areas is also expedient in certain cases, in particular when, as described above, an insufficient minimum size of a sealing surface of the first housing is to be compensated for only in some areas.For example, the cavity is created by a stamping process or a milling process.

[0015] According to a preferred development of the invention, the bearing plate has the outer edge in a bent edge region, in particular at a right angle, so that the cavity is formed by a corresponding bending radius of the surface. The correspondingly bent edge region advantageously ensures that the cavity is particularly simple and geometrically uniform. In particular, the edge region is bent by 90°. The correspondingly bent bearing plate preferably corresponds in its outer contour to the corresponding recess in the first housing, which conversely means that the not yet bent bearing plate must initially be larger than the recess, at least in some areas, for example, in the case of a circular bearing plate, it has a larger diameter so that correspondingly excess material is available for forming.

[0016] Particularly preferably, the bearing plate has a recess in the surface of the outer edge that forms the cavity, in particular a circumferential recess or a pocket. Such a recess has the advantage that the cavity is manufactured with particular precision. The correspondingly formed bearing plate preferably corresponds in its outer contour to the corresponding recess in the first housing, which conversely means that the not yet formed bearing plate must initially be larger than the recess, at least in some areas; for example, in the case of a circular bearing plate, it has a larger diameter, so that correspondingly excess material is available for forming.For example, the recess formed as a pocket is provided only in an area of ​​the bearing plate where a corresponding sealing surface of the first housing falls below a specified value in terms of a minimum size, so that, together with the sealing surface extended by the pocket, a sufficient sealing effect is achieved. In particular, the recess is provided in addition to the bent edge area described above. This creates a particularly advantageous possibility of further enlarging the cavity, at least in certain areas, in order to maximize the overall sealing effect.

[0017] According to a preferred development of the invention, the bearing plate has a chamfer on the surface of the outer edge, in particular a circumferential chamfer, forming the cavity. This chamfer advantageously ensures that the cavity is particularly uniform. The chamfer is preferably provided in addition to the recess described above, which further enlarges the cavity at least in some areas to further improve the sealing effect, for example, depending on a minimum sealing surface size to be achieved.

[0018] The brake force generator of a motor vehicle braking system with the features of claim 11 comprises an electric motor and is characterized by the housing arrangement according to the invention. The electric motor is arranged in the first housing of the housing arrangement. This results in the aforementioned advantages. The brake force generator is preferably designed as an electromechanical brake force generator.

[0019] The method with the features of claim 12 for producing the housing assembly according to the invention is characterized in that the surface of the outer edge and / or an edge region of the bearing plate is reshaped or primary formed at least in some regions to produce the cavity. This advantageously ensures that the cavity is produced particularly simply and efficiently, without the need for complex structural changes to the housing assembly itself. For example, the cavity is produced by embossing or milling. It is particularly preferably provided that the edge region is bent, in particular at a right angle. Bending the edge region advantageously ensures that the cavity is produced particularly simply and with a uniform geometric shape.

[0020] According to a preferred embodiment of the invention, the surface of the outer edge is provided with a recess, particularly a circumferential recess or a pocket recess. Providing the surface with such a recess offers the advantage that the cavity is manufactured with particular precision.

[0021] It is particularly preferred that the surface of the outer edge be provided with a chamfer, in particular a circumferential one. Providing the surface with such a chamfer has the advantage that the cavity is produced particularly uniformly.

[0022] Further preferred features and combinations of features emerge from the above description and from the claims. The invention is explained in more detail below with reference to the drawings.

[0023] Figure 1 shows a housing arrangement,

[0024] Figure 2 shows a first embodiment of the housing arrangement in a detailed view,

[0025] Figure 3A shows a second embodiment of the housing arrangement in a first detailed view,

[0026] Figure 3B shows a variant of the second embodiment in a second detailed view,

[0027] Figure 4 shows a third embodiment of the housing arrangement in a detailed view, and

[0028] Figure 5 shows a method for manufacturing the housing assembly. Figure 1 shows a housing assembly 1, in the present case as part of a brake booster 2 (not shown in detail) of a braking system of a motor vehicle. The housing assembly 1 has a first housing 3 and a second housing 4. The first housing 3 has a first recess 5. The second housing 4 has a second recess 6. The housings 3, 4 are sealingly connected to one another in the region of their respective recesses 5, 6.

[0029] The first housing 3 is at least substantially cylindrical and designed as a pole pot, with the first recess 5 formed in an end face 12 of the housing 3. In this case, the first housing 3 is flanged and screwed to a second sealing surface 14 of the second housing 4, which second sealing surface 14 surrounds the second recess 6, by means of a first sealing surface 13 surrounding the first recess 5.

[0030] An electric machine 7 is arranged in the first housing 5. The electric machine 7 has a rotor shaft 8. A bearing plate 9 of the housing assembly 1, formed here as a sheet metal part with at least a largely constant thickness, is arranged in the first recess 5, in this case pressed in, and is assigned to the electric machine 7.

[0031] The geometric relationships relating to the bearing plate 9 are illustrated in the following exemplary embodiments of Figures 2, 3A and 4, each of which shows a detailed view identical in terms of the section in the form of a sectional view in the dashed-bordered area A of Figure 1. Figure 3B shows a corresponding section in area A in which the second housing 4 has been omitted.

[0032] Thus, the bearing plate 9 carries a bearing element 10, in this case designed as a ball bearing, through which the rotor shaft 8 is mounted. The bearing plate 9 has an at least substantially circular outer contour and, for receiving the bearing element 10, a bearing receptacle 11 that geometrically corresponds to an outer contour of the bearing element 10. On or in a surface 15 of an outer edge 16 of the bearing plate 9 facing the second housing 4, a cavity 17 is formed, at least in some regions, for receiving a sealing agent 18, in particular a silicone-based one, between the bearing plate 9 and the first housing 3. Due to the circular outer contour of the bearing plate 9, the outer edge 16 is a circumferential outer edge 16. A further surface 19 of the bearing plate 9 adjacent to the surface 15 is, in this case, at least approximately at the same height, i.e., flush with the first sealing surface 13.

[0033] The cavity 17 is formed by forming and / or primary forming the bearing plate 9 in the area of ​​the outer edge 16. The embodiments differ accordingly in the design of the cavity 17.

[0034] Thus, in the first embodiment shown in Figure 2, the bearing plate 9 has the outer edge 16 in a bent edge region 20, in this case at a right angle, so that the cavity 17 is formed by a corresponding bending radius of the surface 15.

[0035] In the second embodiment shown in Figure 3A, the bearing plate 9 has a recess 21 in the surface 15 of the outer edge 16 forming the cavity 17, in particular a circumferential recess or a recess formed as a pocket.

[0036] In the third embodiment shown in Figure 4, the bearing plate 9 has a chamfer 22, in particular a circumferential one, forming the cavity 17 on the surface 15 of the outer edge 16.

[0037] In particular, the cavity 17—formed by edge region 20, recess 21, and / or chamfer 22—is formed circumferentially along the surface 15; alternatively, it is provided only in certain regions. Preferably, at least two of the variants are combined, for example, a circumferential chamfer 22 with an additional recess 21 provided only in certain regions. In the case of a cavity 17 provided only in certain regions, the cavity 17 is preferably formed only in a region of the bearing plate 9 assigned to a predetermined region of the first housing 3, in particular depending on a dimension of the first sealing surface 13 surrounding the first recess 5.

[0038] This is illustrated in Figure 3B, which in this respect describes a variant or further development of the second embodiment shown in Figure 3A. It can be seen that the corresponding recess 21 is formed only in the region of the bearing plate 9 in which the sealing surface 13 has only a small extent, or in which the corresponding housing flange formed thereby has its smallest extent. The recess 21 is thus designed as a pocket.

[0039] An advantageous method for manufacturing the housing assembly 1 is described below with reference to Figure 5. Figure 5 illustrates the method using a flow chart. In particular, the method ensures that a sealing length between the two housings 3, 4 is increased while maintaining the same component size.

[0040] In a step S1, the corresponding bearing plate 9 is provided and the surface 15 of the outer edge 16 and / or an edge region 20 of the bearing plate 9 is at least partially reshaped or primary formed in order to produce the cavity 17 as described above.

[0041] For the first embodiment, the edge region 20 is bent, in particular at a right angle. For the second embodiment, the surface 15 of the outer edge 16 is provided with the recess 21, in particular a circumferential recess or a pocket recess. For the third embodiment, the surface 15 of the outer edge 16 is provided with the chamfer 22, in particular a circumferential recess. Corresponding combinations are possible, as described above.

[0042] In a step S2, the correspondingly machined bearing plate 9 is inserted, in particular pressed, into the provided first housing 3. Finally, in a step S3, the two housings 3, 4 are sealingly connected to one another by means of the sealing agent 18, wherein the sealing agent 18 flows into the resulting cavity 17 to extend the length of the sealing surfaces 13, 14, as described above.

Claims

Claims 1. Housing arrangement (1), with a first housing (3) in which an electrical machine (7) can be or is arranged, with a bearing plate (9) for the electrical machine (7) arranged in a first recess (5) of the first housing (3), and with a second housing (4) having a second recess (6), wherein the housings (3, 4) can be or are connected to one another in a sealing manner in the region of their respective recesses (5, 6), characterized in that on or in a surface (15) of an outer edge (16) of the bearing plate (9) facing the second housing (4), at least in some regions, a cavity (17) for receiving a, in particular silicone-based, sealing means (18) is formed between the bearing plate (9) and the first housing (3).

2. Housing arrangement according to claim 1, characterized in that the first housing (3) is at least substantially cylindrical, and that the first recess (5) is formed in an end face (12) of the housing (3).

3. Housing arrangement according to one of the preceding claims, characterized in that the first housing (3) is flanged and / or screwed with a first sealing surface (13) surrounding the first recess (5) to a second sealing surface (14) of the second housing (4) surrounding the second recess (6).

4. Housing arrangement according to one of the preceding claims, characterized in that the cavity (17) is formed only in a region of the bearing plate (9) assigned to a predetermined region of the first housing (3), in particular depending on a dimension of a first sealing surface (13) surrounding the first recess (5).

5. Housing arrangement according to one of the preceding claims, characterized in that the bearing plate (9) is designed as a sheet metal part with at least largely constant thickness and is pressed into the housing (3).

6. Housing arrangement according to one of the preceding claims, characterized in that the bearing plate (9) has an at least substantially circular outer contour, and that the outer edge (16) is a circumferential outer edge (16).

7. Housing arrangement according to one of the preceding claims, characterized in that the cavity (17) is formed by reshaping and / or primary shaping of the bearing plate (9) in the region of the outer edge (16).

8. Housing arrangement according to one of the preceding claims, characterized in that the bearing plate (9) has the outer edge (16) in a bent edge region (20), in particular at a right angle, so that the cavity (17) is formed by a corresponding bending radius of the surface (15).

9. Housing arrangement according to one of the preceding claims, characterized in that the bearing plate (9) has a recess (21) in the surface (15) of the outer edge (16) forming the cavity (17), in particular a circumferential recess or a recess designed as a pocket.

10. Housing arrangement according to one of the preceding claims, characterized in that the bearing plate (9) has a chamfer (22) on the surface (15) of the outer edge (16) forming the cavity (17), in particular a chamfer running all around.

11. Brake force generator (2) of a braking system of a motor vehicle, with an electric machine (7), characterized by a housing arrangement (1) according to one of claims 1 to 10.

12. Method for producing a housing arrangement (1) according to one of claims 1 to 10, characterized in that the surface (15) of the The outer edge (16) and / or an edge region (20) of the bearing plate (9) is at least partially reshaped or primary formed to produce the cavity (17).

13. Method for producing a housing arrangement (1) according to claim 12, characterized in that the edge region (20) is bent, in particular at a right angle.

14. A method for producing a housing arrangement (1) according to one of claims 12 and 13, characterized in that the surface (15) of the outer edge (16) is provided with a recess (21), in particular a circumferential recess or a recess formed as a pocket.

15. Method for producing a housing arrangement (1) according to one of claims 12 to 14, characterized in that the surface (15) of the outer edge (16) is provided with a, in particular circumferential, chamfer (22).

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