bearing plate

Abstract

End shield (1), consisting of a hard material component (2) which is connected to a soft material component (3) and has at least one feedthrough opening (4) for the feedthrough of a conductor means (21) and a mechanical interface to a housing component, the feedthrough opening (4) is sealed with the soft material component (3) and the interface to the housing component consists of the soft material component (3) to form a housing seal, wherein a feedthrough seal (24) with a housing cover seal (35) and / or a motor housing seal (25) in the form of a sealing ring forms a continuous material region and are connected to one another by one connecting region (26) or several connecting regions (26), and wherein the soft material component (3) is arranged axially and / or radially circumferentially without interruption between the motor housing (20) and the end shield (1).

Description

[0001] The invention relates to a bearing plate (1) consisting of a first hard material component (2) and a second soft material component (3), wherein the hard material component (2) is connected to the soft material component (3).

[0002] DE 42 43 716 A1 discloses a bearing plate consisting of a hard material component which is connected to a soft material component and has at least one through-opening for the passage of a conductor means and a mechanical interface to a housing component, wherein the through-opening is sealed with a soft material component and the interface to the housing component consists of a soft material component to form a housing seal.

[0003] The object of the invention is to provide a bearing plate that can be manufactured economically and using proven methods, with high precision and high functional integration.

[0004] This object is achieved according to the invention by the features of claim 1. By means of the two different material components being connected to one another, different properties such as strength, sealing capacity, damping capacity, tolerance compensation capacity, noise behavior, thermal conductivity properties, etc. can be combined in a compact component. In this way, multiple assembly steps for different components and their separate production can be avoided. Furthermore, the sealing effect can be increased and thus made more reliable by avoiding assembly errors and by the precision of the matching material components. The soft material region forms a continuous material region through a connecting region (26) or through several connecting regions which connect the feedthrough seal (24) to the housing cover seal (35).Likewise, one or more connecting areas between the motor housing seal (25), which is designed in the form of a sealing ring, and the feedthrough seals can form a circumferentially uninterrupted material area.

[0005] Further developments of the invention are presented in the subclaims. The conductor means (21) is preferably electrically connected to a winding wire and / or to an external connection.

[0006] By installing a housing cover, a sealed housing for electronics can be easily created without the need to install a sealing element. A motor housing (20) can also be installed in a similar manner.

[0007] Liquid silicone or thermoplastic elastomers are particularly suitable as sealing materials, and thus for the soft material component. These exhibit sufficient pressure and temperature resistance and particularly good sealing properties.

[0008] The housing cover seal can be arranged either axially or radially, or in a combination of axially and radially, between the housing cover (6) and the bearing plate (1). The selection depends on the geometry and fastening materials of the joining partners.

[0009] Without the need to assemble or manufacture additional parts, the connection areas or other specially shaped areas of the soft material component can be used as a mounting base for a printed circuit board. The flexibility of the soft material component allows for easy compensation of circuit board tolerances.

[0010] Due to their size and weight, electronic power components are often subject to considerable mechanical stress. Therefore, critical components are secured using a holding and / or damping material. However, such securing devices are subject to strict limitations with regard to the pressure force acting on the components. Therefore, it is particularly important that the corresponding holding means be designed with particular precision. In a further development of the inventive concept, it is therefore proposed that the soft material component (3) have a contact contour for an electronic power component (19).

[0011] When using sharp-edged electrical feedthroughs, they cannot be sealed sufficiently even with overmolding. Therefore, a cavity is provided around the sealing area, which can accommodate a potting material if necessary to achieve additional sealing.

[0012] Furthermore, the bearing shield is provided with fastening means that have receptacles for bushings. In many applications, particularly in the automotive sector, components such as the bearing shield are subjected to high mechanical loads. To prevent vibrations from being completely transmitted to sensitive components, it is proposed to incorporate fastening bushings in a soft material component. According to the invention, the soft material component of the bearing shield should be used for this purpose and be continuously connected to the sealing areas.

[0013] Bearing shields typically also have bearing mounts. With the bearing shield according to the invention, the bearing can also be dampened using the soft material component, which also allows for tolerance compensation.

[0014] It is common practice to route cooling elements through the bearing shield to the outside to dissipate heat from power electronics. This may require additional sealing. In this case, the soft material component of the bearing shield is also suitable as a sealing material.

[0015] The same applies to additional ground contacts that are routed through the bearing shield to a stator. Their functionality is similar to the feedthroughs of the conductors mentioned above.

[0016] The hard material component has different functions than the soft material component. In particular, the hard material component forms a stator indexing projection (15) for mounting a stator (16).

[0017] The stator indexing projection (15) also serves as a centering device for the stator (16). Furthermore, a stop (8) is provided for mounting the bearing plate (1) to an electric motor (10).

[0018] The hard material component can be a metal material, a thermoset material or a thermoplastic material.

[0019] Embodiments of the invention are explained in more detail below with reference to the drawings. They show: Fig. 1 a sectional view of an electric motor with a first embodiment of a bearing plate, Fig. 2 a soft material component of the bearing shield, Fig. 3 a sectional view of an alternative electric motor with a second embodiment of a bearing plate, Fig. 4 an external view of the alternative electric motor, Fig. 5 a sectional view of a third embodiment of a bearing plate, Fig. 6 a spatial representation of the third embodiment, Fig. 7 a sectional view of a fourth embodiment of a bearing shield and Fig. 8 a spatial representation of the fourth embodiment.

[0020] Note: Reference symbols with an index and corresponding reference symbols without an index denote details of the same name in the drawings and the drawing description. This refers to the use in a different embodiment, the prior art, and / or the detail is a variant. For the sake of simplicity, the claims, the introduction to the description, the list of reference symbols, and the summary contain only reference symbols without an index.

[0021] Fig. 1 shows a sectional view of an electric motor 10 with a first embodiment of a bearing plate 1. The bearing plate 1 has a hard material component 2 as the main component and a soft material component 3 as a secondary component. The soft material component serves to seal between the bearing plate 1 and a motor housing 20 and to seal between the bearing plate 1 and a conductor means 21. For this purpose, the soft material component 3 has a feedthrough seal 24, a motor housing seal 25, and a connecting region 26, which connects the feedthrough seal 24 to the motor housing seal 25 to form a self-contained material region. In the first embodiment shown, the conductor means 21 consists of the winding wire, which is inserted into a receiving slot 22 of an insulation displacement contact socket 23. The bearing plate 1 further has a bearing receptacle 13 and a stop 8 for contact with the motor housing.The electric motor 10 has a stator 16 with a stator winding 29, a permanent magnet rotor 27, with a rotor shaft 30, a bearing 28 and an end plate 31, which has a bearing shield function.

[0022] Fig. Figure 2 shows a spatial representation of the soft material component 3 of the bearing plate, with the feedthrough openings 4, which are delimited by the feedthrough seal 24, the motor housing seal 25 in the form of a sealing ring, and the connecting region 26, which connects the feedthrough seal 24 to the motor housing seal 25. In the first embodiment shown, there are three feedthrough openings 4, feedthrough seals 24, and connecting regions 25.

[0023] Fig. Figure 3 shows a sectional view of an alternative electric motor 10a with a second embodiment of a bearing plate 1a, with a hard material component 2a, a soft material component 3a, a bearing receptacle 13a, a bearing 28a, a feedthrough opening 4a, and a mechanical interface to a housing cover 6a. The electric motor 10a has a permanent magnet rotor 27a with a rotor shaft 30a, a stator with a stator winding 29a, and a motor housing 20a. The motor housing 20a is designed here as a deep-drawn component with a housing flange 37a and a recess 32a for receiving a housing bearing 33a. The stator winding 29a is electrically connected via a stamped grid 34a. A conductor means 21a, integral with the stamped grid 34a, is passed through the feedthrough opening 4a of the bearing plate 1a and electrically connected to a printed circuit board 18a. The circuit board 18a has, among other things, power components 19a.The feedthrough opening 4a is defined by a feedthrough seal 24a, which seals the conductor means 21a. Adjacent to the feedthrough seal is a connecting region 26a, which establishes a material connection to a motor housing seal 25a on the one hand and to a housing cover seal 35a on the other. In this embodiment, the housing cover seal is arranged axially. The bearing plate 1a has a cylindrical jacket region 40a, which, together with the housing cover 6a, defines an electronics compartment 5a.

[0024] Fig. Figure 4 shows an external view of the alternative electric motor 10a, including the motor housing 20a, the bearing plate 1a, and the housing cover 6a. The bearing plate 1a is arranged between the housing flange 37a and the housing cover 6a and is screwed together using screws 36a. Furthermore, fastening means 12a are provided for securing the electric motor 1a.

[0025] Fig. Figure 5 shows a sectional view of a third embodiment of a bearing plate 1b, comprising a hard material component 2b, a soft material component 3b, conductor means 21b, a cylinder jacket region 40b, and a bearing receptacle 13b. The conductor means 21b are formed here as overmolded contact elements, which, on the one hand, have an insulation displacement contact 39b and, on the other hand, a press-in contact 38b for electrical and mechanical connection to a circuit board. The soft material component 3b forms a feedthrough opening 4b, a feedthrough seal 24b, a connection region 26b, and a motor housing seal 25b.In this embodiment, the motor housing seal 25b is arranged in a radially outer region of the bearing plate 1b. The conductor means 21b are overmolded using a two-component process, in which the conductor means are inserted into an injection mold, and then the two material components of the bearing plate are injected one after the other. Also shown are a ground contact 17b and stator indexing projections 15b, which enable the angularly correct assembly of a stator. This also ensures centering of the stator.

[0026] Fig. Figure 6 shows a three-dimensional representation of the third embodiment of the bearing plate 1b, with the hard material component 2b, the soft material component 3b, the cover seal 25b, the feedthrough seal 24b, the conductor means 21b, and the press-in contacts 38b. The feedthrough seal 24b is surrounded by an edge 11b of the hard material component. This edge 11b serves to define a cavity 7b and potentially accommodate a potting material. This can, if necessary, improve the sealing properties of the feedthrough seal. Cooling elements 14b are also provided, which are used to contact a printed circuit board in order to conduct the heat generated there radially outward to the fastening means 12b. The cooling elements 14b are overmolded and consist of a copper sheet. The fastening means 12b have receptacles 9b into which sockets can be mounted.These sockets can also be made of a thermally conductive material and absorb and transfer heat from the cooling elements 14b. In addition to the conductor means 21b, a ground contact 17b is similarly connected and sealed to the bearing plate 1b. Furthermore, a circuit board indexing projection 41b is provided, which enables the correct mounting of the circuit board.

[0027] Fig. 7 shows a sectional view of a fourth embodiment of a bearing shield 1c, comprising a hard material component 2c, a soft material component 3c, a bearing receptacle 13c, a cylinder jacket region 40c, fastening means 12c, and receptacles 9c. Conductor means 21c, each with a press-in contact 38c and an insulation displacement contact 39c, as well as a ground contact 17c, are injected into the bearing shield 1c. The soft material component consists of feedthrough seals 24c, a housing cover seal 35c, and a plurality of connecting regions 26c, which connect the housing cover seal 35c to the various feedthrough seals 24c. In this embodiment, the housing cover seal 35c is arranged in a radial inner region of the bearing shield 1c.

[0028] Fig.8 shows a spatial representation of the fourth embodiment, with the bearing plate 1c, the hard material component 2c, the soft material component 3c, the housing cover seal 35c, the connecting regions 26c, the feedthrough seals 24c, the edges 11c, the cavities 7c, the cooling elements 14c, the conductor means 21c, the ground contact 17c, the receptacles 9c and the fastening means 12c. List of reference symbols 1 bearing plate 2 hard material components 3 soft material components 4 Feed-through opening 5 Electronics room 6 housing cover 7 Cavity 8 stop 9 Recording 10 Electric motor 11 Edge 12 fasteners 13 Stock recording 14 Cooling element 15 Indexing advantage 16 Stator 17 Ground contact 18 circuit board 19 Power component 20 engine housing 21 ladder means 22 Recording slot 23 insulation displacement contact socket 24 Feedthrough seal 25 Engine housing gasket 26 Connection area 27 Permanent magnet rotor 28 warehouses 29 Stator winding 30 Rotor shaft 31 End plate 32 Deepening 33 housing bearings 34 punched grids 35 Cover seal 36 screw 37 Housing flange 38 press-in contact 39 insulation displacement contact 40 cylinder jacket area 41 PCB indexing projection

Claims

[1] Bearing plate (1), consisting of a hard material component (2) which is connected to a soft material component (3) and has at least one feedthrough opening (4) for the passage of a conductor means (21) and a mechanical interface to a housing component, the feedthrough opening (4) is sealed with the soft material component (3) and the interface to the housing component consists of the soft material component (3) to form a housing seal, wherein a feedthrough seal (24) with a housing cover seal (35) and / or a motor housing seal (25) in the form of a sealing ring forms a continuous material region and are connected to one another by a connecting region (26) or several connecting regions (26), and wherein the soft material component (3) is arranged axially and / or radially circumferentially without interruption between the motor housing (20) and the bearing plate (1). [2] Bearing plate according to claim 1, characterized by that the conductor means (21) is electrically connected to a winding wire and / or to an external terminal. [3] Bearing plate according to claim 1 or 2, characterized by that the housing component is a housing cover (6) and / or a motor housing (20). [4] End shield according to claim 1, 2 or 3, characterized by that the housing seal is a housing cover seal (35) and / or a motor housing seal (25). [5] End shield according to claim 1, 2, 3 or 4, characterized by that the soft material component consists of liquid silicone or a thermoplastic elastomer. [6] End shield according to claim 1, 2, 3, 4 or 5, characterized by that the housing cover seal (35) is arranged axially and / or radially between the housing cover (6) and the bearing plate (1). [7] Bearing plate according to at least one of the preceding claims, characterized bythat a connecting region (26) between a feedthrough seal (24) and the housing cover seal (35) serves as a receiving means for a printed circuit board (18). [8] Bearing plate according to at least one of the preceding claims, characterized by that the soft material component (3) has a contact contour for an electronic power component (19). [9] Bearing plate according to at least one of the preceding claims, characterized by that it additionally has a cavity (7), in particular a circumferential groove around a contact feedthrough, such as a press-in contact (38), in which a seal is mounted or which is filled with a potting. [10] Bearing plate according to at least one of the preceding claims, characterized by that it has fastening means (12) with receptacles (9) for bushings. [11] Bearing plate according to claim 10, characterized bythat the soft material component (3) is / are arranged between the fastening means (12) and the bushings. [12] End shield according to at least one of the preceding claims, characterized by that it has a bearing holder (13) and the soft material component (3) is arranged between the bearing holder (13) and a bearing (28). [13] Bearing plate according to at least one of the preceding claims, characterized by that it has cooling elements (14), in particular cooling fins or heat-conducting elements. [14] End shield according to at least one of the preceding claims, characterized by that it has a sealed passage for a ground contact (17) to the stator (16), wherein the sealing material consists of the soft material component (3). [15] End shield according to at least one of the preceding claims, characterized by that it has a stator indexing projection (15) for the correct angle mounting of a stator (16). [16] End shield according to at least one of the preceding claims, characterized by that the stator indexing projection (15) additionally serves as a centering means for the stator (16). [17] End shield according to at least one of the preceding claims, characterized by that its hard material component (2) has a stop (8) for mounting on an electric motor (10). [18] Bearing plate according to at least one of the preceding claims, characterized by that the hard material component (2) is a metal material, a thermoset material or a thermoplastic material.

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