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Abstract

The invention relates to an assembly (10; 10a) comprising at least two components (12; 12a, 13; 13a, 14) which are connected to one another in a connecting region (18; 18a), wherein the at least two components (12; 12a, 13; 13a, 14) have sealing surfaces (22, 29, 48, 49; 54, 55) arranged opposite one another in the connecting region (18; 18a), between which at least one first wet seal (30; 30a) made of a first material (31) is arranged at least in sections.

Description

Technical area

[0001] The invention relates to an assembly consisting of at least two components, which can be sealed in a particularly simple and effective manner against different media acting from different sides in a connection area between the components. State of the art

[0002] An assembly is known from DE 10 2013 201 790 A1 by the applicant. In the known assembly, two components are connected to one another in a connecting area, whereby the assembly forms a housing. In the connecting area, the housing has two sealing surfaces that run radially around a longitudinal axis of the housing, between which a wet seal is arranged. The known assembly or the wet seal prevents the ingress of media from the environment into the interior of the housing. Such a wet seal has the advantage that, compared to a rigid, prefabricated seal, it can be adapted particularly easily to different geometries of the connecting area or the components. This is advantageous, for example, in the case of seal geometries that are not flat or have steps between the sealing surfaces. Disclosure of the invention

[0003] The assembly according to the invention with the features of claim 1 has the advantage that it enables, in a particularly simple manner, an optimization of the protection of the assembly against different media which act on the connection area from different sides or areas.

[0004] The invention is based on the idea of ​​enabling an optimized seal over the service life of the assembly by means of several wet seals, the different materials of which are adapted to the medium acting on the wet seal.

[0005] Against the background of the above explanations, an assembly having the features of claim 1 therefore comprises at least two components that are connected to one another in a connecting region. In the connecting region, the at least two components have opposing sealing surfaces, between which at least one first wet seal made of a first material is arranged, at least in sections. The assembly according to the invention is characterized in that a second wet seal made of a different material from the first material is additionally arranged in the connecting region.

[0006] Advantageous further developments of the assembly according to the invention are listed in the subclaims.

[0007] In a first variant of the assembly, two components can be connected to each other in the connection area, and the two wet seals can be arranged side by side in the area of ​​the sealing surfaces. The lateral arrangement of the two wet seals prevents mixing of the wet seal materials, allowing them to maintain their optimal chemical composition and thus sealing properties.

[0008] A further preferred embodiment of the assembly provides that three components are connected to one another in the connection region, wherein a first component and a third component are arranged on opposite sides of a second component, wherein two first sealing surfaces are formed between the first component and the second component and two second sealing surfaces are formed between the second component and the third component, and that the two wet seals are arranged between the first sealing surfaces and / or the second sealing surfaces.

[0009] In a preferred geometric design of the sealing surfaces, these are flat in the area of ​​at least one of the two wet seals and preferably run perpendicular to a longitudinal axis of the assembly. This enables optimal distribution of the wet seal material when joining the components and easy metering of the material of the respective wet seals in the area of ​​the sealing surfaces.

[0010] It can also be provided that the sealing surfaces in the area of ​​the two wet seals are offset from each other in a direction perpendicular to the sealing surfaces. This allows for particularly easy spatial separation of the two wet seals, and the stepped offset between the sealing surfaces enables a geometric configuration between the two components, which, in the case of cylindrical components, allows them to be particularly easily positioned and centered radially relative to each other.

[0011] In order to optimally protect the assembly against the influence of the different media in the circumferential direction of the assembly, it can also preferably be provided that the sealing surfaces and / or the wet seals are annular.

[0012] Another application of the assembly is that it has a channel penetrating the sealing surfaces in the region of the sealing surfaces, which channel is preferably arranged perpendicular to the sealing surfaces. In this case, it is also particularly preferred that one of the wet seals is arranged radially circumferentially in the channel.

[0013] It can also be provided that one of the sealing surfaces extends to an inner or outer boundary wall of the components, and that at least one of the components has a sealing bevel in the area between the inner or outer boundary wall and the sealing surface. Such a sealing bevel has the advantage of allowing optimized curing of the wet seal material, since, for example, air acts particularly easily on the wet seal material and allows for a large contact surface in the area of ​​the material.

[0014] In particular, the difference between the two materials of the two wet seals is that the first material exhibits high resistance to a polar medium, and the second material exhibits high resistance to a non-polar medium. Such a non-polar medium can be, for example, an ATF oil, in which case the material of the wet seal is, for example, an acrylate. The polar medium can be, for example, a coolant, such as a water-glycol mixture, in which case the material of the wet seal is, for example, silicone.

[0015] To optimise the adhesion of the wet seal material to the sealing surfaces, it can also be provided that the sealing surfaces in the area of ​​the different wet seals have different roughness depths or roughnesses

[0016] Furthermore, the invention also comprises a motor housing, in particular a motor housing of an electric motor, with an assembly designed according to the invention as described so far.

[0017] In a structurally advantageous embodiment of the electric motor, it is provided that the motor housing has a system housing as the first component, a stator housing as the second component, and a bearing plate as the third component, wherein the stator housing is partially surrounded radially by the system housing, wherein a first medium, in particular a cooling medium, is arranged between the stator housing and the system housing in contact with the connecting region, and that a channel is formed which crosses the three components in the region of the sealing surfaces and through which a second medium, in particular an oil, flows.

[0018] In a further development of the electric motor, it is provided that the second component has a radially circumferential sealing flange which forms sealing surfaces with opposite end faces formed on the first component and the third component.

[0019] In order to ensure the desired mechanical connection between the components and the compression / distribution of the wet seals between the sealing surfaces, the three components are connected to each other in the connection area by fastening screws and clamped axially.

[0020] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments of the invention and from the drawings. Short description of the drawings Fig. 1 shows a perspective view of a motor housing of an electric motor used to drive a vehicle in an exploded view and Fig. 2 and Fig. 3 a section through two components of an assembly before and after they are joined. Embodiments of the invention

[0021] Identical elements or elements with the same function are provided with the same reference numbers in the figures.

[0022] In the Fig. 1 shows an assembly 10 in the form of a motor housing 1 of an electric motor 100. The electric motor 100 is preferably designed as a drive motor for driving an electric vehicle. However, the invention is not intended to be limited to the design of assemblies 10 in the form of motor housings 1 or electric motors 100. Rather, the assembly 10 can also be designed, for example, as an electric axle or form a fuel cell.

[0023] The assembly 10 according to the Fig. 1 has three components 12, 13 and 14, which adjoin one another along a longitudinal axis 16 of the assembly 10 and are connected to one another in a connecting region 18. In the exemplary embodiment, the three components 12, 13 and 14 are each designed, for example, as metal components in the form of die-cast parts, in particular made of aluminum. The first component 12 forms a so-called system housing 20 of the motor housing 1 and has, radially encircling the longitudinal axis 16 in the connecting region 18, a flat first sealing surface 22 arranged perpendicular to the longitudinal axis 16. The second component 13 forms a stator housing 24 of the motor housing 1. The stator housing 24 has a hollow-cylindrical cooling section 25, which has at least one cooling channel 26 on its outer surface for guiding a first medium, in particular a coolant.

[0024] The coolant is, for example, a water / glycol mixture with polar properties. When the two components 12, 13 are assembled, the first component 12 surrounds the cooling section 25 of the second component 13 with its inner surface at a small radial distance or in contact, so that the coolant is arranged in contact with the facing surfaces of the two components 12, 13 and the connecting area 18.

[0025] The second component 13 has, on the end face facing away from the first component 12, a sealing flange 28 extending radially around the longitudinal axis 16. The sealing flange 28 forms, on the side facing the first sealing surface 22, a further first planar sealing surface 29, which interacts with the first sealing surface 22 on the first component 12, wherein the two first sealing surfaces 22, 29 are arranged overlapping one another and are each annular.

[0026] A first wet seal 30 is arranged between the two first sealing surfaces 22, 29. The first wet seal 30 consists of a first material 31, which is adapted or optimized for the first medium with regard to its sealing function. In the case of the coolant mentioned or its polar properties, the first material 31 therefore consists of silicone, for example. The first wet seal 30 is preferably applied in the form of a closed adhesive bead 33 on at least one of the two first sealing surfaces 22, 29, wherein in the illustration of the Fig. 1 For reasons of simplification, the adhesive bead 33 on the first sealing surface 22 of the first component 12 is shown only in sections.

[0027] Furthermore, the first component 12 has two channels 34, 35 arranged side by side in the region of the first sealing surface 22, which extend perpendicular to the first sealing surface 22. The two channels 34, 35 serve to convey a second medium, in particular an oil with non-polar properties. Through-bores 37, 38 for conveying the second medium are formed in the sealing flange 28 of the second component 13, aligned with the two channels 34, 35.

[0028] The two channels 34, 35 are, for example, surrounded at a small radial distance by two annular second wet seals 39, 40, each made of a different second material 43 than the first material 31 of the first wet seal 30. The second material 43 is adapted or optimized for the second medium with regard to its sealing function and, when oil is used as the second medium, consists, for example, of an acrylate. The two second wet seals 39, 40 are preferably also each metered in the form of a closed adhesive bead on one of the two first sealing surfaces 22, 29, so that the two second wet seals 39, 40 are arranged laterally next to the first wet seal 30.

[0029] The second component 13 is connected to the third component 14 in the area of ​​the sealing flange 28. The third component 14 forms a bearing plate 41. The three components 12, 13 and 14 are connected by means of several fastening screws 42 which are arranged parallel to the longitudinal axis 16. The fastening screws 42 penetrate through holes 44, 45 on the third component 14 and on the sealing flange 28 of the second component 13, and engage in threaded holes 46 in the area of ​​the end face of the first component 12. The fastening screws 42 (axially) clamp the three components 12 to 14 in the connecting area 18, wherein the connecting area 18 comprises both the connection between the first component 12 and the second component 13, and between the second component 13 and the third component 14.

[0030] The second component 13 has, on the side facing the third component 14 in the region of the sealing flange 28, a second, flat sealing surface 48 which is annular and runs perpendicular to the longitudinal axis 16. The first second sealing surface 48 interacts with a further, likewise flat second sealing surface 49 which is formed on the end face of the third component 14 facing the sealing flange 28. The third component 14 has, in alignment with the through holes 37, 38 on the second component 13 in the Fig. 1 undetectable channels for guiding the second medium.

[0031] In order to seal the through holes 37, 38 for the channels 34, 35 between the second component 13 and the third component 14, at least one further second wet seal 51, 52 in the form of a bead is metered between the two second sealing surfaces 48, 49.

[0032] In the Fig. 2 and Fig.In the assembly 10a shown in Figure 3, the two components 12a, 13a, which are connected to one another in the connecting region 18a, are each annular. The two sealing surfaces 54, 55, which interact with one another in the connecting region 18a, each have a step 56, 57, which serve to radially center the two components 12a, 13a relative to a longitudinal axis 16a. The two sealing surfaces 54, 55 each have flat partial surfaces 58, 59 and 60, 61, which are offset from one another in the direction of the longitudinal axis 16a. On the side facing the longitudinal axis 16a, the components 12, 13a form an inner boundary wall 64, and on the side facing away from the longitudinal axis 16a, they form an outer boundary wall 65. In the area between the partial surfaces 58 and 60, the first, annularly arranged wet seal 30a made of the first material 31 is arranged, and between the two partial surfaces 59, 61, an annular second wet seal 39a made of the second material 43 is arranged around the channel 34a.The first component 12a has, in the region of the inner boundary wall 64, a sealing chamfer 68 extending radially around the longitudinal axis 16a, starting from the sealing surface 54. The sealing chamfer 68 allows improved access of air to the material 31 of the first wet seal 30a after the two components 12a, 13a have been joined, in order to enable improved or faster curing.

[0033] It should also be noted that, in order to optimize the sealing effect and / or the curing of the materials 31, 43 of the two wet seals 30, 30a and 39, 39a, 40, the roughness depths in the area of ​​the sealing surfaces 22, 29, 48, 49 and 54, 55 can be different. In particular, the sealing surfaces 22, 29, 54, 55 in the area of ​​the first wet seal 30, 30a have a greater roughness depth, for example R z 10-25, while the roughness depth in the area of ​​the second wet seal 39, 39a, 40 is lower and, for example, as R z 6-10 is trained.

[0034] The assembly 10, 10a described so far can be modified or altered in many different ways without deviating from the inventive concept. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2013 201 790 A1

[0002]

Claims

[1] Assembly (10; 10a) comprising at least two components (12; 12a, 13; 13a, 14) which are connected to one another in a connecting region (18; 18a), wherein the at least two components (12; 12a, 13; 13a, 14) have sealing surfaces (22, 29, 48, 49; 54, 55) arranged opposite one another in the connecting region (18; 18a), between which at least one first wet seal (30; 30a) made of a first material (31) is arranged at least in sections, characterized by that in the connecting region (18; 18a) there is additionally arranged a second wet seal (39; 39a; 40, 51, 52) made of a second material (43) different from the first material (31). [2] Assembly according to claim 1, characterized by that two components (12, 13; 12a, 13a) are connected to one another in the connecting region (18; 18a), and that the two wet seals (30; 30a, 39; 39a, 40) are arranged laterally next to one another in the region of the sealing surfaces (22, 29; 54, 55). [3] Assembly according to claim 1 or 2, characterized by in that three components (12, 13, 14) are connected to one another in the connecting region (18), wherein a first component (12) and a third component (14) are arranged on opposite sides of a second component (13), wherein two first sealing surfaces (22, 29) are formed between the first component (12) and the second component (13) and two second sealing surfaces (48, 49) are formed between the second component (13) and the third component (14), and in that the two wet seals (30, 39, 40, 51, 52) are arranged between the first sealing surfaces (22, 29) and / or the second sealing surfaces (48, 49). [4] Assembly according to one of claims 1 to 3, characterized by that the sealing surfaces (22, 29, 48, 49; 54, 55) in the region of at least one of the two wet seals (30; 30a; 39; 39a; 40, 51, 52) are flat and preferably run perpendicular to a longitudinal axis (16; 16a) of the assembly (10; 10a). [5] Assembly according to one of claims 1 to 4, characterized by that the sealing surfaces (54, 55) in the region of the two wet seals (30a, 39a) are arranged offset from one another in a direction perpendicular to the sealing surfaces (54, 55). [6] Assembly according to one of claims 1 to 5, characterized by that the sealing surfaces (22, 29, 48, 49; 54, 55) and / or the wet seals (30; 30a; 39; 39a; 40, 51, 52) are annular. [7] Assembly according to one of claims 1 to 6, characterized by that in the region of the sealing surfaces (22, 29, 48, 49; 54, 55) at least one channel (34; 34a, 35) is arranged which passes through the sealing surfaces (22, 29, 48, 49; 54, 55) and preferably runs perpendicular to the sealing surfaces (22, 29, 48, 49; 54, 55). [8] Assembly according to claim 7, characterized by that one of the wet seals (39; 39a; 40, 51, 52) extends radially around the at least one channel (34; 34a, 35). [9] Assembly according to one of claims 1 to 8, characterized by that one of the sealing surfaces (54) extends to an inner or outer boundary wall (64, 65) of the components (12a, 13a), and that at least one of the components (12a, 13a) has a sealing chamfer (68) in the region between the inner or outer boundary wall (64, 65) and the sealing surface (54). [10] Assembly according to one of claims 1 to 9, characterized by that the first material (31) has a high resistance to a polar medium, and that the second material (43) has a high resistance to a non-polar medium. [11] Assembly according to one of claims 1 to 10, characterized by that the sealing surfaces (22, 29, 48, 49; 54, 55) in the area of ​​the wet seals (30; 30a; 39; 39a; 40, 51, 52) have different roughness depths (R Z ). [12] Electric motor (100), in particular drive motor for an electric vehicle, with an assembly (10; 10a) forming a motor housing (1), which is designed according to one of claims 1 to 11. [13] Electric motor according to claim 12, characterized by in that the motor housing (1) has a system housing (20) as the first component (12), a stator housing (24) as the second component (13), and a bearing plate (41) as the third component (14), the stator housing (24) being radially surrounded in regions by the system housing (20), a first medium, in particular a cooling medium, being arranged in contact with the connecting region (18) between the stator housing (24) and the system housing (20), and in that a channel (34, 35) is formed which passes through the three components (12, 13, 14) in the region of the sealing surfaces (22, 29, 48, 49) and through which a second medium, in particular an oil, flows. [14] Electric motor according to claim 13, characterized bythat the second component (13) has a radially circumferential sealing flange (28) which forms sealing surfaces (29, 48) with opposite end faces formed on the first component (12) and the third component (14). [15] Electric motor according to claim 13 or 14, characterized by that the three components (12, 13, 14) are connected to one another in the connecting area (18) by fastening screws (42).

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