Metal shell and electronic device

Abstract

The utility model provides a metal shell, which comprises a first shell and a second shell, the first shell is provided with a first fixing hole, the inner side of the second shell is provided with a fixing part corresponding to the position of the first fixing hole, and the fixing part is formed by bending the extending part of the side wall of the second shell. The fixing part comprises a fixing plate provided with a second fixing hole and a supporting part, the supporting part is arranged between the fixing plate and the bottom of the second shell, and a self-tapping screw penetrating through the first fixing hole is fixed to the second fixing hole. The utility model also provides an electronic device. According to the metal shell and the electronic device provided by the utility model, the inner side of the shell is provided with the fixing part comprising the fixing plate and the supporting part, the fixing plate is provided with the fixing hole, and the supporting part is arranged between the fixing plate and the bottom of the shell and is used for supporting the fixing plate, so that the fixing plate can be prevented from sinking and deforming when a self-tapping screw is screwed in; and therefore, the flatness of the assembled metal shell is ensured.

Description

Technical Field

[0001] The utility model relates to the field of automobiles, in particular to a metal shell and an electronic device. Background Art

[0002] An electronic device in the automotive field, such as an electronic control unit, has a metal housing including a first housing 1 and a second housing 2. Figure 1 As shown, the first housing 1 is provided with a first fixing hole 11 , the second housing 2 is provided with a second fixing hole 20 , and the self-tapping screw 3 passes through the first fixing hole 11 and is fixed on the second fixing hole 20 .

[0003] The second fixing hole 20 is provided on the second housing 2. When the self-tapping screw 3 is screwed in, the corresponding part of the second housing 2 will sink and deform, affecting the flatness of the metal housing after assembly.

[0004] like Figure 1 As shown, when the self-tapping screw 3 is screwed into the second fixing hole 20, metal debris will be generated. In order to prevent these metal debris from affecting the working reliability of the circuit board inside the electronic control unit, the second fixing hole 20 of the second housing 2 is usually processed into a sunken blind hole to accommodate the metal debris.

[0005] There is a rounded portion 201 at the bottom of the sunken blind hole, which cannot engage with the self-tapping screw 3, thereby reducing the effective matching size of the second fixing hole 20 and the self-tapping screw 3, thereby reducing the connection force between the self-tapping screw 3 and the second fixing hole 20. The bumps and vibrations during the driving of the vehicle may cause the first shell 1 and the second shell 2 to be loosely connected, which may cause the electronic control unit to work unreliably. Summary of the invention

[0006] In view of the problems existing in the prior art, the problem to be solved by the utility model is to provide a metal shell, wherein a fixing portion including a fixing plate and a supporting portion is arranged on the inner side of the shell, the fixing plate is provided with a fixing hole, and the supporting portion is arranged between the fixing plate and the bottom of the shell for supporting the fixing plate, which can prevent the fixing plate from sinking and deforming when the self-tapping screws are screwed in, thereby ensuring the flatness of the metal shell after assembly.

[0007] The utility model provides a metal shell, comprising a first shell and a second shell, the first shell being provided with a first fixing hole, a fixing portion being provided at a position corresponding to the first fixing hole on the inner side of the second shell, the fixing portion being formed by bending a portion extending from a side wall of the second shell, the fixing portion comprising a fixing plate provided with the second fixing hole and a supporting portion, the supporting portion being provided between the fixing plate and the bottom of the second shell and being used for supporting the fixing plate, and the self-tapping screw passing through the first fixing hole being fixed to the second fixing hole.

[0008] Further, the second fixing hole is a through hole, and a side wall of the second fixing hole extends toward the bottom of the second shell.

[0009] Further, a bottom area of ​​the second shell surrounded by the support portion and the side wall of the second shell is provided with a discharge hole for discharging metal scraps.

[0010] Furthermore, a gap between a side edge of the support portion and a side wall of the second shell is less than or equal to 1 mm.

[0011] Furthermore, the width of the fixing plate is greater than the width of the corresponding portion of the supporting portion, and a protrusion facing the supporting portion is provided at a position of the fixing plate corresponding to the first edge of the supporting portion, and an end of the protrusion contacts the first edge of the supporting portion.

[0012] Furthermore, a first bend is formed between the fixing portion and the second shell side wall, and the larger the bending radius of the first bend is, the larger the height of the protrusion is.

[0013] Further, the fixing plate is provided with two protrusions, and the center of the second fixing hole is located on a line connecting the centers of the two protrusions.

[0014] The utility model also provides an electronic device, comprising the above-mentioned metal shell and a PCB board arranged in the metal shell.

[0015] Furthermore, a third fixing hole is provided on the PCB board at a position corresponding to the first fixing hole of the first shell of the metal shell, and a self-tapping screw passing through the first fixing hole and the third fixing hole is fixed to the second fixing hole.

[0016] Furthermore, the electronic device is an electronic control unit, an instrument or an infotainment system.

[0017] Compared with the prior art, the metal shell and the electronic device provided by the utility model have the following beneficial effects: a fixing portion including a fixing plate and a supporting portion is arranged on the inner side of the shell, the fixing plate is provided with a fixing hole, and the supporting portion is arranged between the fixing plate and the bottom of the shell for supporting the fixing plate, which can prevent the fixing plate from sinking and deforming when the self-tapping screws are screwed in, thereby ensuring the flatness of the metal shell after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial schematic diagram of the existing metal shell fixation;

[0019] Figure 2 is a schematic diagram of an electronic device according to an embodiment of the utility model;

[0020] Figure 3 yes Figure 2 An exploded view of the electronic device shown;

[0021] Figure 4 yes Figure 2 A cross-sectional view of a fixing portion of a second housing of a metal housing of an electronic device shown;

[0022] Figure 5 It is a schematic diagram of fixing the first housing, the PCB board and the second housing;

[0023] Figure 6 It is the top view of the fixed part;

[0024] Figure 7 yes Figure 6 The cross-sectional view along the BB direction;

[0025] Figure 8 yes Figure 7 Cross-sectional view along CC direction. DETAILED DESCRIPTION

[0026] The electronic device of one embodiment of the present invention, such as an electronic control unit, may also be an instrument or an infotainment system in other embodiments.

[0027] like Figure 2 , Figure 3 As shown, the electronic control unit includes a metal shell and a PCB board 4 arranged in the metal shell, and the metal shell includes a first shell 1 and a second shell 2.

[0028] The first housing 1 is provided with a first fixing hole 11 , and a fixing portion 21 is provided at a position on the inner side of the second housing 2 corresponding to the first fixing hole 11 .

[0029] like Figure 4 , Figure 5 , Figure 6 As shown, the fixing portion 21 is formed by bending a portion extending from the side wall of the second shell 2, and the fixing portion 21 includes a fixing plate 211 provided with a second fixing hole 2111 and a supporting portion 212, wherein the supporting portion 212 is used to support the fixing plate 211, and the supporting portion 212 is arranged between the fixing plate 211 and the bottom 22 of the second shell 2, so that the fixing plate 211 is prevented from sinking and deforming when the self-tapping screw 3 is screwed into the second fixing hole 2111, thereby ensuring the flatness of the metal shell after assembly.

[0030] In this embodiment, the PCB board 4 is provided with a third fixing hole 41 at a position corresponding to the first fixing hole 11, and the self-tapping screw 3 passing through the first fixing hole 11 and the third fixing hole 41 is fixed to the second fixing hole 2111. Figure 5 In other embodiments, the PCB board 4 may not be provided with a fixing hole, and the self-tapping screw 3 passing through the first fixing hole 11 is directly fixed to the second fixing hole 2111 .

[0031] The second fixing hole 2111 is a through hole formed by stamping. In this embodiment, the hole depth of the second fixing hole 2111 is 2.5 mm. The side wall of the second fixing hole 2111 extends toward the bottom 22 of the second housing 2, eliminating the blind hole ( Figure 1 The rounded corner portion 201 at the bottom of the second fixing hole 20) in the middle increases the effective matching size, which correspondingly increases the connection force between the self-tapping screw 3 and the second fixing hole 2111, thereby avoiding the bumps and vibrations during the driving of the vehicle causing the first shell 1 and the second shell 2 to be loosely connected, thereby ensuring that the electronic control unit works reliably.

[0032] The bottom 22 of the second housing 2 surrounded by the support portion 212 and the side wall 23 of the second housing 2 is provided with a discharge hole 221. Figure 5 As shown, it is used to discharge metal chips.

[0033] The gap between the side edge of the support portion 212 and the side wall 23 of the second housing 2 is less than or equal to 1 mm, which can prevent metal debris from affecting the normal operation of the PCB board in the metal housing, thereby ensuring that the electronic control unit works reliably.

[0034] like Figure 6 As shown, the width of the fixing plate 211 is greater than the width of the corresponding portion of the support portion 212, and the fixing plate 211 is provided with a protrusion 2112 facing the support portion 212 at a position corresponding to the first edge 2121 of the support portion 212, and the end of the protrusion 2112 contacts the first edge 2121 of the support portion 212, as shown in FIG. Figure 5 As shown, the support portion 212 provides support for the fixing plate 211 at the protrusion 2112 .

[0035] A first bend 231 is formed between the fixing plate 211 and the side wall 23 of the second housing 2. Figure 6 As shown. From the perspective of production and processing, the larger the bending radius of the first bend 231, the easier it is to process. However, the larger the bending radius, the larger the gap between the fixing plate 211 and the first edge 2121 of the support portion 212. The larger the gap, the greater the risk of dust entering. On the other hand, the greater the possibility of failure of electrical experiments, such as EMS, EMC, EMI, etc., so the size range of this gap is generally controlled to be 0.5mm-1.0mm.

[0036] like Figure 7 , Figure 8As shown, the greater the bending radius of the first bend 231, the greater the height of the protrusion 2112, as long as the height of the protrusion 2112 is equal to or close to the gap size between the two surfaces it supports (the fixing plate 211 and the first edge 2121 of the support portion 212). Usually, it is the bending radius of the first bend 231 minus the thickness of the second shell 2, to ensure that the end of the protrusion 2112 is in contact with the first edge 2121 of the support portion 212, so that the support portion 212 can provide support more effectively at the protrusion 2112, and this structure is easier to adapt to the gap size in different situations.

[0037] In this embodiment, the fixing plate 211 is provided with two protrusions 2112, and the center of the second fixing hole 2111 is located on the line connecting the centers of the two protrusions 2112. Figure 6 As shown, when the self-tapping screw 3 is screwed into the second fixing hole 2111 , the support portion 212 can provide support at the protrusion 2112 more effectively.

[0038] Although the utility model has been disclosed as a preferred embodiment, the utility model is not limited thereto. Any changes and modifications made by any person skilled in the art without departing from the spirit and scope of the utility model should be included in the protection scope of the utility model, so the protection scope of the utility model should be based on the scope defined by the claims.

Claims

1. A metal shell, characterized in that: The metal shell includes a first shell and a second shell, the first shell is provided with a first fixing hole, a fixing portion is provided at a position corresponding to the first fixing hole on the inner side of the second shell, the fixing portion is formed by bending a portion extending from the side wall of the second shell, the fixing portion includes a fixing plate provided with the second fixing hole and a supporting portion, the supporting portion is provided between the fixing plate and the bottom of the second shell, and is used to support the fixing plate, and the self-tapping screw passing through the first fixing hole is fixed to the second fixing hole.

2. The metal housing according to claim 1, characterized in that: The second fixing hole is a through hole, and a side wall of the second fixing hole extends toward the bottom of the second shell.

3. The metal housing according to claim 1, characterized in that: A discharge hole is provided in the bottom area of ​​the second housing surrounded by the support portion and the side wall of the second housing for discharging metal scraps.

4. The metal housing according to claim 1, wherein: A gap between a side edge of the supporting portion and a side wall of the second shell is less than or equal to 1 mm.

5. The metal housing according to claim 1, characterized in that: The width of the fixing plate is greater than the width of the corresponding part of the supporting part. The fixing plate is provided with a protrusion facing the supporting part at a position corresponding to the first edge of the supporting part, and an end of the protrusion contacts the first edge of the supporting part.

6. The metal housing according to claim 5, characterized in that: A first bend is formed between the fixing portion and the side wall of the second shell body. The larger the bending radius of the first bend is, the greater the height of the protrusion is.

7. The metal housing according to claim 5, characterized in that: The fixing plate is provided with two protrusions, and the center of the second fixing hole is located on the line connecting the centers of the two protrusions.

8. An electronic device, characterized in that: The electronic device comprises the metal housing according to any one of claims 1 to 7 and a PCB board arranged in the metal housing.

9. The electronic device as claimed in claim 8, characterized in that: The PCB board is provided with a third fixing hole at a position corresponding to the first fixing hole of the first shell of the metal shell, and the self-tapping screw passing through the first fixing hole and the third fixing hole is fixed to the second fixing hole.

10. The electronic device as claimed in claim 8, characterized in that Electronic devices are electronic control units, instruments or infotainment systems.

Images