Method for connecting metal housing and plastic cover, and metal housing comprising plastic cover
By plastic deformation on the shoulder of the metal ring between the metal shell and the plastic cover, forming a connection between the shape and the force fit, the problem of insufficient connection retention force between the metal shell and the plastic cover in the prior art is solved, and the problem of insufficient connection retention force between the metal shell and the plastic cover is realized. High durable connection.
Patent Information
- Application Number
- CN202380047039.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-07-01
- Filing Date
- 2023-06-02
- Publication Date
- 2025-02-07
AI Technical Summary
In the prior art, the connection between the metal shell and the plastic cover is smaller due to different materials, and it is easy to cause damage to the plastic cover.
By plastic deformation on the shoulder of the metal ring, the metal shell enters the recess of the metal ring, thereby forming a connection between shape fit and force fit, improving the durability and retention force of the connection.
High retention and durable connection between the metal housing and the plastic cover is achieved, ensuring the safety and stability of the plastic cover.
Smart Images
Figure CN119404418A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a method for connecting a metal housing and a plastic cover. The invention also relates to a metal housing with a plastic cover. Background Art
[0002] Usually, the metal housing and the plastic cover are screwed together or connected so that the form-fitting elements on the metal housing and the plastic cover interact with each other. However, due to the different materials of metal and plastic, the connection using the form-fitting element is disadvantageous and can cause the retention force to be reduced.
[0003] DE 10 2020 131 326 A1 discloses an electric motor for driving an actuating device of a motor vehicle. The electric motor has a housing having a housing base body and a plug-in module, which forms a housing wall of the housing and encloses an interior space together with the housing base body. The plug-in module has a connector located outside the interior space. In addition, a screw with a screw head is provided, by means of which the plug-in module is fastened to the housing base body, wherein the screw is completely arranged in the interior space. Summary of the invention
[0004] The object of the invention is to provide an alternative method for connecting a metal housing and a plastic cover and an alternative metal housing with a plastic cover. In particular, the connection of the metal housing and the plastic cover should have a high holding force and be particularly durable. These objects are achieved by the subject matter of claims 1 and 7. Preferred embodiments can be found in the dependent claims.
[0005] According to the method for connecting a metal housing and a plastic cover according to the invention, a metal housing substantially made of a metal material is provided, wherein a metal ring having a shoulder extending at least partially in the circumferential direction is at least partially overmolded with a plastic material in order to form a plastic cover, wherein the plastic cover is pushed axially into the metal housing so that the metal ring is located on at least a portion of the circumference of the metal housing, wherein the metal housing is plastically deformed by applying a force so that the metal housing at least partially enters a recess formed by the shoulder on the metal ring.
[0006] In other words, the cylindrical metal ring has a shoulder, wherein the shoulder is designed to face the recess of the metal shell, ie, is spaced apart from the metal shell, so that a groove-shaped cavity is spatially formed between the shoulder on the metal ring and the metal shell.
[0007] The connection between the metal ring and the plastic is a positive fit, since the metal ring is at least partially or completely overmolded with the plastic material. Furthermore, the connection between the metal ring and the metal housing is at least a positive fit, since forces acting on the metal housing cause the metal housing to deform plastically, so that the metal housing at least partially enters the groove-like recess formed by the shoulder on the metal ring, i.e., the cavity between the metal ring and the metal housing.
[0008] The metal ring between the metal housing and the plastic cover creates a particularly durable connection between the metal housing and the plastic cover and has a high holding force. In addition, the metal ring reliably prevents damage to the plastic cover. Preferably, the metal housing and / or the metal ring are formed from a steel alloy. For example, the metal housing and the metal ring are formed from the same material and therefore have the same material properties.
[0009] The axial insertion of the plastic cover into the metal housing means that the plastic cover and the metal housing are axially displaced relative to each other, i.e. the two components are moved towards each other or at least one of the two components is moved in the direction of the other component. Thus, it makes no difference whether the plastic cover is pushed axially into the metal housing or the metal housing is pushed axially onto the plastic cover. In particular, both the metal housing and the plastic cover are cylindrical.
[0010] Preferably, the metal shell and the plastic cover are connected by pressing the metal shell and the metal ring. By pressing, a force-fit and form-fit connection is established between the metal shell and the metal ring by at least plastically deforming the metal shell, in particular only the metal shell. For example, the metal shell is plastically deformed by applying a force at a specified embossing point, so that a part of the metal shell is displaced into a groove-shaped cavity between the metal ring and the metal shell, and is in force-fit contact with the side wall of the cavity, i.e., the side wall on the shoulder of the metal ring. For example, a force is applied to the outer peripheral surface of the metal shell in a radially inward direction, so that a protrusion is formed on the inner peripheral surface of the metal shell in a radially inward direction, wherein the protrusion is engaged in a recess formed by the shoulder of the metal ring in a form-fit and force-fit manner.
[0011] Preferably, the at least partially circumferential shoulder on the metal ring is formed by deforming the metal ring. In particular, the metal ring is formed from a steel sheet or a steel tube, wherein the at least partially circumferential shoulder on the metal ring is preferably formed by cold forming. For example, the shoulder on the metal ring is completely circumferential. Alternatively, a plurality of shoulders are arranged spaced apart from each other in the circumferential direction and / or in the axial direction.
[0012] According to a preferred embodiment, the shoulder formed as a protrusion on the inner peripheral surface of the metal ring is completely overmolded with plastic material. Thus, the radially inwardly extending protrusion is completely surrounded by the plastic material and is thus connected to the plastic material in a form-fitting manner. Preferably, the groove-like recess formed on the outer peripheral surface established by the shoulder is free of plastic material.
[0013] For example, the shoulder on the metal ring has a rectangular, semicircular, elliptical or trapezoidal cross section open on one side, wherein the cross section is open toward the metal shell, thereby forming a recess. In particular, the recess formed by the shoulder is groove-shaped around the outer peripheral surface of the metal ring.
[0014] Preferably, the metal shell is at least partially pressed, in particular locally restrained, in the radial direction on the outer peripheral surface so as to at least partially enter radially into the recess formed by the shoulder on the metal ring. For example, the metal shell is pressed around the entire outer peripheral surface or in several areas defined in the peripheral direction, preferably in at least three areas evenly spaced apart in the peripheral direction, so that the metal shell is plastically deformed only in these areas.
[0015] Preferably, the plastic cover is pushed axially into the metal housing until it is pushed against a shoulder formed in the metal housing. Thus, a shoulder is formed on the inner peripheral surface of the metal housing, so that this reduction in the inner diameter in the metal housing forms an axial stop for the plastic cover. This ensures an exact positioning of the metal housing and the plastic cover during assembly. For example, the metal ring of the plastic cover rests on a shoulder in the metal housing at the front. Furthermore, the connection of the metal housing and the plastic cover is simplified by the plastic deformation of the metal housing.
[0016] The metal housing with a plastic cover according to the present invention has a metal ring, which is at least partially arranged between the metal housing and the plastic cover, wherein the metal ring has a shoulder extending at least partially along the periphery, wherein the shoulder forms a recess for receiving at least part of the plastic deformation area of the metal housing. Therefore, the recess formed by the shoulder is formed on the peripheral surface of the metal ring forming the metal housing. Since the plastically deformed metal of the metal housing enters the recess during the assembly process, the metal housing and the plastic cover are indirectly connected via the metal ring at least in a form-fitting manner.
[0017] According to a preferred embodiment, the metal shell is at least partially plastically deformed in the region of the shoulder on the metal ring on the outer peripheral surface. This plastic deformation is visible as a recess in the outer peripheral surface of the metal shell. The metal ring is arranged on the inner peripheral surface of the metal shell, wherein the material displaced on the outer peripheral surface of the metal shell has entered the recess formed by the shoulder on the metal ring to connect the metal shell to the plastic cover.
[0018] The electric machine according to the invention has a metal housing with a plastic cover according to the invention. In particular, the metal housing with a plastic cover according to the invention is produced according to the method according to the invention. For example, the electric machine is intended for use in a motor vehicle, in particular for driving an actuator. The plastic cover of the metal housing is designed specifically as a plug-in module. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Other measures for improving the present invention are shown in more detail below in conjunction with the description of the preferred embodiments of the present invention based on the accompanying drawings. In the accompanying drawings:
[0020] Figure 1 shows a schematic perspective cross-sectional view of a metal ring;
[0021] Figure 2 shows a schematic perspective cross-sectional view of a plastic cover;
[0022] Figure 3 Shows that according to Figure 2 A schematic three-dimensional cross-sectional view of a metal housing with a plastic cover; and
[0023] Figure 4 A schematic perspective cross-sectional view of a metal housing with a plastic cover after making a connection is shown. DETAILED DESCRIPTION
[0024] Figures 1 to 4 The method steps for connecting the metal housing 1 and the plastic cover 2 are shown by means of a metal ring 3 which is arranged partially between the metal housing 1 and the plastic cover 2 .
[0025] according to Figure 1 , a partially shown cylindrical metal ring 3 is manufactured to have a shoulder 4 extending in the peripheral direction. The shoulder 4 has a substantially trapezoidal cross section and is formed radially inwardly on the metal ring 3 so that a circumferential groove-like recess is formed on the outer peripheral surface of the metal ring 3. The shoulder 4 is manufactured, for example, by cold forming the metal ring 3.
[0026] Figure 2 A plastic cover 2 is shown, which is formed by using plastic Figure 1 The metal ring 3 shown in the figure is produced by overmolding. In other words, the metal ring 3 is placed in an injection mold and overmolded with plastic to produce the plastic cover 2. The shoulder 4 formed as a projection on the inner peripheral surface of the metal ring 3 is completely overmolded with plastic material. No plastic material is provided on the outer peripheral surface of the metal ring 3.
[0027] Figure 3A plastic cover 2 is shown which is arranged in a metal housing 1, wherein a metal ring 3 is arranged with its outer peripheral surface on the inner peripheral surface of the metal housing 1. The plastic cover 2, i.e. the metal ring 3 which is overmoulded with plastic, has, for example, a transition fit with the metal housing 1. Alternatively, a clearance fit or an interference fit between the plastic cover 2 and the metal housing 1 is also conceivable. The metal housing 1 has a shoulder 5, i.e. a reduction in the inner diameter, on the inner peripheral surface, wherein the plastic cover 2 is pushed axially into the metal housing 1 until it reaches the shoulder 5 formed in the metal housing 1. The shoulder 5 in the metal housing 1 thus serves as an axial stop surface for positioning the plastic cover 2 in the metal housing 1.
[0028] Figure 4 The metal shell 1 and the plastic cover 2 are shown in a connected state, i.e. after compression of the metal shell 1 and the metal ring 3. In other words, the metal shell 1 is plastically deformed by applying a force to a plurality of embossing points 6 provided for this purpose on the outer peripheral surface, so that the metal shell 1 at least partially enters the recess formed by the shoulder 4 on the metal ring 3. For example, the metal shell 1 and the metal ring 3 are made of the same steel alloy.
[0029] Reference numerals list
[0030] 1 Metal housing
[0031] 2 Plastic cover
[0032] 3 Metal rings
[0033] 4 Shoulders on metal ring
[0034] 5 Shoulder in metal housing
[0035] 6 Embossing Points
Claims
1. A method for connecting a metal shell (1) and a plastic cover (2), in which the metal shell (1) is provided, in which a metal ring (3) having a shoulder (4) extending at least partially in the peripheral direction is at least partially overmolded with a plastic material to form the plastic cover (2), in which the plastic cover (2) is axially pushed into the metal shell (1) together with the metal ring (3) so that the metal ring (3) is located on at least a part of the periphery of the metal shell (1), and in which the metal shell (1) is plastically deformed by applying a force so that the metal shell (1) at least partially enters a recess formed by the shoulder (4) on the metal ring (3).
2. The method according to claim 1, It is characterized in that The metal shell (1) and the plastic cover (2) are connected by pressing the metal shell (1) and the metal ring (3).
3. The method according to any one of the preceding claims, It is characterized in that An at least partially circumferential shoulder (4) on the metal ring (3) is formed by deforming the metal ring (3).
4. The method according to any one of the preceding claims, It is characterized in that The shoulder (4) formed as a projection on the inner peripheral surface of the metal ring (3) is completely over-molded with plastic material.
5. The method according to any one of the preceding claims, It is characterized in that The metal shell (1) is at least partially pressed in the radial direction on the outer peripheral surface so as to at least partially enter the recess formed by the shoulder (4) on the metal ring (3) in the radial direction.
6. The method according to any one of the preceding claims, It is characterized in that The plastic cover (2) is pushed axially into the metal housing (1) until it reaches a shoulder (5) formed in the metal housing (1).
7. A metal housing (1) with a plastic cover (2), wherein: A metal ring (3) is at least partially arranged between the metal shell (1) and the plastic cover (2), wherein the metal ring (3) has a shoulder (4) extending at least partially along the periphery, and the shoulder forms a recess for accommodating at least a portion of the plastic deformation area of the metal shell (1).
8. The metal housing (1) according to claim 7, It is characterized in that The metal shell (1) and / or the metal ring (3) are made of a steel alloy.
9. The metal housing (1) according to claim 7 or 8, It is characterized in that The metal housing (1) is at least partially plastically deformed in the region of the shoulder (4) on the metal ring (3) on the outer peripheral surface.
10. An electric machine having a metal housing (1) according to any one of claims 7 to 9.