Butterfly-shaped grounding sheet and grounding structure of motor PCBA

Abstract

The utility model relates to a butterfly ground lug and a grounding structure of a motor PCBA, the butterfly ground lug comprises a pressure contact plate part, wing parts and PCBA connecting pins, the two wing parts are respectively arranged at two sides of the pressure contact plate part, the upper end surfaces of the wing parts are higher than the upper end surface of the pressure contact plate part, and the PCBA connecting pins are arranged at the other side surface of the pressure contact plate part. According to the utility model, the structure of the grounding piece is redesigned, the grounding piece is firmly contacted with the end cover by using the pressing contact plate part and the wing part which are not in the same plane, and meanwhile, the PCBA connecting pin is arranged at the other side of the pressing contact plate part, so that the abnormal pressure of the PCBA is avoided, the risk of damage of PCBA components is avoided, and the risk of failure of the motor is further reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro-motor structures, and in particular relates to a butterfly-shaped grounding sheet and a grounding structure of a motor PCBA. Background Art

[0002] The grounding plate plays an important role in the electromagnetic compatibility (EMC) of the motor. The grounding plate is connected to the capacitor on the PCBA. By properly selecting the capacitor, it plays a filtering role. After the voltage burr is filtered by the capacitor, the clutter is connected to the metal casing through the grounding plate and transmitted to the outside of the motor, which can effectively improve the EMC of the motor.

[0003] Currently available technologies such as Figure 1 and Figure 2 As shown, a bow-shaped grounding plate 5 is used. The grounding plate 5 is a metal part, including an integrally formed grounding plate top 51 and a grounding plate PIN pin 52; the grounding plate PIN pin 52 is connected to the capacitor on the PCBA4, and the grounding plate top 51 is pressed by the front cover 1 to ensure good contact of the grounding plate. Due to its crimping characteristics, the PCBA4 will be stressed after assembly. When the size of the bow-shaped grounding plate 5, the housing 2, the front cover 1 or the carbon brush holder 3 itself is not good, the PCBA4 will be damaged due to abnormal stress, causing motor failure. Utility Model Content

[0004] In order to solve the above technical problems, the first object of the utility model is to provide a butterfly-shaped grounding sheet capable of reducing the risk of damage to PCBA components. The second object of the utility model is to provide a grounding structure of a motor PCBA.

[0005] In order to achieve the above first utility model purpose, the utility model adopts the following technical solutions:

[0006] A butterfly-shaped grounding sheet comprises a pressure-touch plate portion, a wing portion and a PCBA connecting pin, wherein two wings are respectively arranged on both sides of the pressure-touch plate portion, and the upper end surface of the wing portion is higher than the upper end surface of the pressure-touch plate portion, and the PCBA connecting pin is arranged on the other side of the pressure-touch plate portion.

[0007] As a preferred solution: the wing portion and the pressure touch plate portion are integrally formed, and the wing portion and the pressure touch plate portion are connected via an inclined transition.

[0008] As a preferred solution: the upper end surfaces of the two wings are flush, and the two wings are parallel to the touch-pressing plate.

[0009] As a preferred solution: the PCBA connecting foot is located at the lower part of the pressure touch plate part, the PCBA connecting foot is connected to the pressure touch plate part through a step-shaped connecting plate, and the PCBA connecting foot and the pressure touch plate part are integrally formed.

[0010] In order to achieve the above second utility model purpose, the utility model adopts the following technical solutions:

[0011] A grounding structure of a motor PCBA comprises a PCBA and a grounding sheet, wherein the grounding sheet is a butterfly-shaped grounding sheet as described in any one of the above items, and a PCBA connecting foot of the butterfly-shaped grounding sheet is fixed to the PCBA by welding.

[0012] As a preferred solution: a carbon brush holder is also included, the PCBA is longitudinally inserted and fixed in the carbon brush holder, and the pressure contact plate portion of the butterfly-shaped grounding sheet abuts against the upper end surface of the carbon brush holder.

[0013] As a preferred solution: it also includes a front end cover and a casing; the carbon brush holder is fixed in the casing and close to the end, and the front end cover is fixed at one end of the casing and abuts against the wing of the butterfly grounding piece.

[0014] The utility model redesigns the grounding plate structure and utilizes the pressure touch plate portion and the wing portion that are not in the same plane, so that the grounding plate is firmly in contact with the end cover, and at the same time, the PCBA connecting foot is arranged on the other side of the pressure touch plate portion, avoiding abnormal pressure on the PCBA, avoiding the risk of damage to PCBA components, and thus reducing the risk of motor failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0016] Figure 1 It is a schematic diagram of the exploded structure of the casing, end cover, carbon brush holder and grounding plate in the prior art;

[0017] Figure 2 It is a schematic diagram of the structure of a grounding plate in the prior art;

[0018] Figure 3 It is a schematic diagram of the exploded structure of the housing, end cover, carbon brush holder and grounding plate of the utility model;

[0019] Figure 4 It is a schematic diagram of the exploded structure of the end cover, carbon brush holder, PCBA and grounding plate of the utility model;

[0020] Figure 5 It is a schematic diagram of the partially enlarged structure of the installation of the PCBA and the grounding plate on the carbon brush holder of the utility model;

[0021] Figure 6 It is a structural schematic diagram of the grounding sheet of the utility model.

[0022] The accompanying drawings are marked as follows: 1, front cover; 2, housing; 3, brush holder; 4, PCBA; 5, grounding plate; 51, top of grounding plate; 52, grounding plate PIN pin; 501, touch panel; 502, wing; 503, PCBA connecting pin. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0030] like Figures 3 to 5 The grounding structure of a motor PCBA shown in the figure includes a front cover 1, a housing 2, a carbon brush holder 3, a PCBA 4 and a grounding plate, wherein the grounding plate is a butterfly-shaped grounding plate 50, and the butterfly-shaped grounding plate 50 includes a pressure contact plate portion 501, a wing portion 502 and a PCBA connecting pin 503, wherein the two wing portions 502 are respectively arranged on both sides of the pressure contact plate portion 501, and the upper end surface of the wing portion 502 is higher than the upper end surface of the pressure contact plate portion 501, and the PCBA connecting pin 503 is arranged on the other side of the pressure contact plate portion 501 (such as Figure 6 shown).

[0031] The carbon brush holder 3 is fixed in the housing 2 and close to the end, the pressure contact plate portion 501 of the butterfly grounding plate 50 is against the upper end surface of the carbon brush holder 3, and the front end cover 1 is fixed at one end of the housing 2 and against the wing portion 502 of the butterfly grounding plate 50; the PCBA4 is longitudinally inserted and fixed in the carbon brush holder 3, and the PCBA connecting pin 503 of the butterfly grounding plate 50 is welded and fixed to the PCBA4.

[0032] The wing 502 is integrally formed with the pressure contact plate 501, and the wing 502 and the pressure contact plate 501 are connected by an inclined transition. The upper end surfaces of the two wing 502 are flush, and the two wing 502 and the pressure contact plate 501 are parallel to each other.

[0033] The PCBA connecting pin 503 is located at the lower part of the pressure touch plate 501 . The PCBA connecting pin 503 is connected to the pressure touch plate 501 through a stepped connecting plate. The PCBA connecting pin 503 and the pressure touch plate 501 are integrally formed.

[0034] In the utility model, the carbon brush holder is made of plastic, the butterfly grounding piece, the housing and the front end cover are all made of metal, the pressure contact plate portion 501 of the butterfly grounding piece 50 presses on the plane of the carbon brush holder, and when the front end cover is assembled and riveted to the housing, due to the presence of the wing portion of the butterfly grounding piece, the grounding piece is firmly in contact with the front end cover to achieve its function, and because the force-bearing surface of the butterfly grounding piece is on the plane of the carbon brush holder rather than on the PCBA surface, the risk of damage to PCBA components due to abnormal force caused by the grounding piece is avoided.

[0035] The utility model redesigns the grounding plate structure, while ensuring the function of the grounding plate, and solves the risk of damage to components and motor failure caused by abnormal force on the PCBA due to the existence of the grounding plate through the design of the butterfly grounding plate.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A butterfly-shaped grounding plate, characterized in that: It comprises a pressure touch panel portion (501), a wing portion (502) and a PCBA connecting pin (503), wherein the two wing portions (502) are respectively arranged on both sides of the pressure touch panel portion (501), and the upper end surface of the wing portion (502) is higher than the upper end surface of the pressure touch panel portion (501), and the PCBA connecting pin (503) is arranged on the other side of the pressure touch panel portion (501).

2. The butterfly-shaped grounding plate according to claim 1, characterized in that: The wing portion (502) and the pressure touch plate portion (501) are integrally formed, and the wing portion (502) and the pressure touch plate portion (501) are connected via an inclined transition.

3. The butterfly-shaped grounding plate according to claim 1, characterized in that: The upper end surfaces of the two wing portions (502) are flush, and the two wing portions (502) and the pressure contact plate portion (501) are parallel to each other.

4. The butterfly-shaped grounding plate according to claim 1, characterized in that: The PCBA connecting foot (503) is located at the lower part of the pressure touch plate (501), and the PCBA connecting foot (503) is connected to the pressure touch plate (501) through a step-shaped connecting plate, and the PCBA connecting foot (503) and the pressure touch plate (501) are integrally formed.

5. A grounding structure of a motor PCBA, comprising a PCBA (4) and a grounding sheet, characterized in that: The grounding plate is a butterfly-shaped grounding plate (50) according to any one of claims 1 to 4, and the PCBA connecting pin (503) of the butterfly-shaped grounding plate (50) is fixed to the PCBA (4) by welding.

6. The grounding structure of a motor PCBA according to claim 5, characterized in that: It also includes a carbon brush holder (3), the PCBA (4) is longitudinally inserted and fixed in the carbon brush holder (3), and the pressure contact plate portion (501) of the butterfly-shaped grounding sheet (50) abuts against the upper end surface of the carbon brush holder (3).

7. The grounding structure of a motor PCBA according to claim 6, characterized in that: It also includes a front end cover (1) and a casing (2); the carbon brush holder (3) is fixed inside the casing (2) and close to the end, and the front end cover (1) is fixed at one end of the casing (2) and abuts against the wing portion (502) of the butterfly-shaped grounding plate (50).

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