CN220234423U - Motor grounding structure, motor and vehicle - Google Patents

Abstract

The utility model provides a motor grounding structure, a motor and a vehicle. The motor grounding structure comprises a containing part arranged on a motor shell and a plug connected with a grounding line on a circuit board of the motor; wherein, be equipped with the accommodation space that holds partial plug on the accommodation portion, and the plug can be followed the direction elasticity that presets, presets the direction for the plug business turn over accommodation space's direction. According to the motor grounding structure, the accommodating part is in plug-in fit with the plug to form electric connection between the motor shell and the grounding line on the circuit board of the motor, so that the grounding arrangement of the motor shell is realized through the grounding line in the external circuit of the motor; by means of the elastic expansion performance of the plug, connection reliability between the plug and the accommodating portion can be guaranteed even under the condition of vehicle vibration, so that reliable grounding of the motor shell is guaranteed, and a grounding scheme suitable for the metal shell of the small-sized motor for the vehicle is provided.

Description

Motor grounding structure, motor and vehicle

Technical Field

The utility model relates to the technical field of motors for vehicles, in particular to a motor grounding structure. In addition, the utility model also relates to an electric motor and a vehicle.

Background

With the increasing intelligence of vehicles, on-board motors are used as an indispensable important driving component and have a great number of applications on vehicles. In particular, the small-power motors are arranged on vehicles in higher and higher number and higher density, and the motors have higher requirements on heat dissipation, shielding, grounding and the like. These small motors basically use metal housings for heat dissipation and grounding purposes.

Due to the limitation of the process and the whole vehicle arrangement, the small motor cannot be directly overlapped with the grounding system of the vehicle body, and is required to be communicated to the grounding circuit system of the vehicle body through a circuit of the small motor. This is a serious challenge for the grounding design of the motor housing.

If the motor housing is poorly grounded, it is easy to accumulate charges on the metal housing of these small motors and cause EMC (Electromagnetic Compatibility ) problems; furthermore, ESD (electrostatic discharge) problems may occur, and in severe cases, the motor may be ablated, resulting in damage to the motor.

Disclosure of Invention

In view of the foregoing, the present utility model is directed to a grounding structure of a motor, so as to provide a grounding scheme suitable for a metal housing of a small-sized motor for a vehicle.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a motor grounding structure comprises a containing part arranged on a motor shell and a plug connected with a grounding line on a circuit board of the motor; the accommodating part is provided with an accommodating space for accommodating part of the plug, and the plug can elastically stretch and retract along a preset direction; the preset direction is the direction of the plug entering and exiting the accommodating space.

Further, the accommodating part comprises a base plate arranged on the motor shell and a clamping piece arranged on the base plate; the clamping pieces are arranged in two rows oppositely, an accommodating space is formed between the two rows of clamping pieces, and part of the plug is clamped in the accommodating space by the two rows of clamping pieces.

Further, each clamping piece comprises a connecting section connected with the substrate and a clamping section connected with the connecting section; the clamping sections are bent and arranged relative to the connecting sections, an included angle is formed between the clamping sections and the connecting sections, and the containing space is defined between the clamping sections on the two rows of clamping sheets.

Further, along the direction that the plug enters the accommodating space, the distance between the clamping sections on the two rows of clamping pieces is gradually reduced.

Further, an included angle between the connecting section and the clamping section on each clamping piece is between 10 degrees and 30 degrees.

Further, the plug comprises an elastic part, and a plug part and a connecting part which are respectively arranged at two ends of the elastic part; the plug part is positioned in the accommodating space, the connecting part is connected with the circuit board, and the elastic part can elastically stretch and retract.

Further, the plug comprises an elongated plate body; the plate body has upper segment, middle section and the hypomere that connects gradually, the upper segment constitutes plug portion, the middle section constitutes elastic part, the hypomere constitutes connecting portion, just the middle section is crooked form.

Further, the upper section is U-shaped with an opening facing away from the accommodating space; and/or, the middle section is serpentine; and/or the lower section is in a bent shape and comprises a bottom plate connected with the circuit board and a connecting plate connected with the middle section.

Compared with the prior art, the utility model has the following advantages:

according to the motor grounding structure, the accommodating part is in plug-in fit with the plug to form electric connection between the motor shell and the grounding line on the circuit board of the motor, so that the grounding arrangement of the motor shell is realized through the grounding line in the external circuit of the motor; by means of the elastic expansion performance of the plug, connection reliability between the plug and the accommodating space of the accommodating part can be guaranteed even under the condition of vehicle vibration, so that reliable grounding of the motor shell is guaranteed, and a grounding scheme suitable for the metal shell of the small-sized motor for vehicles is provided.

In addition, two rows of clamping sheets are arranged on the accommodating part at intervals, and the plug part of the plug can be elastically clamped between the two clamping sheets by means of the self-deformation performance of the clamping sheets, so that the reliability of electric connection between the plug and the accommodating part is further guaranteed; moreover, the clamping structure design of the two clamping pieces is simple in structure and convenient to process and construct. In addition, the plug and the clamping piece are made of long strip-shaped metal plates, and the plug and the clamping piece have the advantages of being convenient to process and low in cost.

Another object of the present utility model is to provide a motor having a motor housing made of metal, wherein the motor housing adopts the motor grounding structure as described above. Meanwhile, the utility model also provides a vehicle, and the vehicle is provided with the motor. The motor and the vehicle have the technical advantages of the motor grounding structure.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model, wherein the words of front and back, top and bottom, etc. are used to indicate relative position and are not intended to limit the utility model unduly. In the drawings:

fig. 1 is a schematic view of a grounding structure of a motor according to an embodiment of the utility model;

fig. 2 is a schematic diagram illustrating a plug-in fit between a receiving portion and a plug according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of a receiving portion and a plug according to an embodiment of the present utility model before plugging;

fig. 4 is a partial enlarged view of the portion a shown in fig. 1.

Reference numerals illustrate:

1. a circuit board; 10. a ground wire welding point;

2. a housing part; 20. an accommodation space; 21. a clamping piece; 210. a connection section; 211. a clamping section; 22. a substrate;

3. a plug; 30. a plug part; 31. an elastic part; 32. a connection part; 320. a bottom plate; 321. a connecting plate;

4. a motor housing; 5. an insulating base.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that, if terms indicating an orientation or positional relationship such as "upper, lower, left, right, front, rear, inner, outer" or the like are used, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be constructed or operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, in the description of the present utility model, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in combination with specific cases.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

The embodiment relates to a motor grounding structure, and provides a grounding scheme suitable for a metal shell of a small motor for a vehicle; an exemplary configuration of which is shown in fig. 1 and 2.

The motor grounding structure comprises a containing part 2 arranged on a motor shell 4 and a plug 3 connected with a grounding line on a circuit board 1 of the motor. Wherein, the accommodating part 2 is provided with an accommodating space 20 for accommodating part of the plug 3, and the plug 3 can elastically stretch and retract along a preset direction; the preset direction is the direction in which the plug 3 enters and exits the accommodation space 20.

Specifically, the housing part 2 of the present embodiment includes a base plate 22 fixedly attached to the motor housing 4, and a holding piece 21 provided on the base plate 22; the holding pieces 21 are arranged in two rows opposite to each other, the holding space 20 is formed between the two rows of holding pieces 21, and a part of the plug 3 is held in the holding space 20 by the two rows of holding pieces 21. By arranging two rows of clamping pieces 21 on the accommodating part 2 at intervals, the plug part 30 of the plug 3 can be elastically clamped between the two clamping pieces 21 by means of the self-deformation performance of the clamping pieces 21, so that the reliability of electric connection between the plug 3 and the accommodating part 2 is further guaranteed; moreover, the clamping structure of the two clamping pieces 21 is designed, so that the structure is simple, and the processing structure is convenient.

Of course, there are various designs of the clamping pieces 21, in this embodiment, as shown in fig. 3 and 4, each clamping piece 21 includes a connection section connected to the base plate 22, and a clamping section 211 connected to the connection section. The clamping sections 211 are bent relative to the connecting sections 210 and form an included angle a with the connecting sections 210, and the holding sections 211 on the two rows of clamping pieces 21 define a containing space 20 therebetween. In this embodiment, each row of the clamping pieces 21 is one, and the two clamping pieces 21 are symmetrically arranged left and right; on the two clamping pieces 21, two clamping sections 211 are located between the two connecting sections 210, and an accommodating space 20 is formed between the two clamping sections 211. The clamping piece 21 adopts a bending structure, the clamping section 211 bends towards the rear (namely the inserting direction of the plug 3) relative to the connecting section 210, the connecting part between the connecting section 210 and the clamping section 211 protrudes towards the direction of the plug 3, the plug part 30 is easier to slide into the accommodating space 20 formed between the two clamping sections 211 when being inserted into the accommodating space 20, and the situation that the plug part 30 is hard to press one clamping piece 21 is difficult to occur.

And, on the two grip pieces 21, the grip section 211 of one grip piece 21 extends along the insertion direction and is inclined toward the side where the other grip piece 21 is located, the two grip pieces 21 are arranged in a bilateral symmetry manner; in this way, the distance between the clamping sections 211 on the two clamping pieces 21 on both sides of the accommodation space 20 is set to be smaller along the direction in which the plug 3 enters the accommodation space 20. The clamping sections 211 are arranged in an inclined manner, so that the width dimension of the accommodating space 20 between the two clamping sections 211 is gradually reduced along with the depth, the plug part 30 can be more reliably clamped between the two clamping sections 211 after being inserted, and the connection stability between the plug part 30 and the clamping sections 211 is further improved.

Based on the above arrangement, on the same clamping piece 21, an included angle a is formed between the connecting section 210 and the clamping section 211, and preferably, the included angle a is set as: a is more than or equal to 10 degrees and less than or equal to 30 degrees. The inclination angle of the clamping sections 211 is set within a reasonable range, so that good balance can be achieved between the insertion resistance of the plug part 30 and the elastic clamping force of the two clamping sections 211 on the plug part 30, and under the condition that the insertion force of the plug part 30 is moderate, the enough elastic clamping force of the two clamping sections 211 on the plug part 30 is ensured. For example, the above-described angle a may be set to 10 °, 15 °, 18 °, 25 °, or 30 °.

As shown in fig. 3 and 4, in the present embodiment, the plug 3 includes an elastic portion 31, and a plug portion 30 and a connection portion 32 provided at both ends of the elastic portion 31, respectively; the plug part 30 is inserted into the accommodating space 20, the connecting part 32 is connected with the grounding line of the circuit board 1, and the elastic part 31 can be elastically deformed to change the distance between the plug part 30 and the connecting part 32. The plug 3 is designed into three parts of the plug part 30, the elastic part 31 and the connecting part 32, so that the functions of connection, insertion and elastic expansion are respectively realized, the overall structural arrangement of the plug 3 is more reasonable, and the design and the construction are convenient.

Of course, the plug 3 may take various forms, for example, a spring-plug combination may be provided. However, the plug 3 of the present embodiment is formed by bending an elongated plate body having an upper section, a middle section and a lower section connected in order, the upper section constituting the plug portion 30, the middle section constituting the elastic portion 31, the lower section constituting the connecting portion 32; and the middle section is in a curved shape. The plug 3 is manufactured by adopting a strip-shaped metal plate body, and has the advantages of convenience in processing and low cost; preferably, a metal plate made of steel or copper alloy can be adopted, so that good conductivity and certain elasticity of the metal plate are guaranteed. The thickness d1 and the width W1 of the metal plate of the plug 3 may be set reasonably according to the load current condition of the motor ground, for example, d1 is set to 0.5 to 2mm, and W1 is set to 5 to 15mm.

Accordingly, the clamping piece 21 is also preferably formed by bending an elongated metal plate, and the thickness d2 and the width W2 of the metal plate of the clamping piece 21 can be set with reference to the case of the plug 3, however, W2 is preferably greater than W1 to ensure that the two clamping sections 211 can completely clamp the plug portion 30.

Specifically, the upper section of the plug portion 30, the middle section of the elastic portion 31, and the lower section of the connecting portion 32 are preferably bent as follows for the entire plug 3. The upper section is U-shaped with an opening facing away from the accommodating space 20; the middle section is curvedly arranged in the inserting direction and is in a serpentine bending shape; the lower section is in a bent shape and comprises a bottom plate 320 which is abutted on the circuit board 1 and a connecting plate 321 which is connected with the bottom end of the middle section, and the bottom plate 320 is welded and connected with the grounding circuit of the circuit board 1 at the ground wire welding point 10. It should be noted in particular that the middle section of the elastic portion 31 of the present embodiment is longest in distance, and the elastic expansion and contraction is effected thereby; the middle section part is in a serpentine bending structure design, and can be used for designing 3-6 roundabout bends, so that the elasticity of the structure is further enhanced, and the electric connection stability of the whole grounding structure under mechanical disturbance such as vehicle vibration is ensured, so that the motor grounding structure of the embodiment has locally good mechanical disturbance resistance. With the above-described structure, not only the insertion reliability of the plug portion 30 and the excellent elastic expansion and contraction ability of the elastic portion 31 in the insertion direction can be ensured, but also the processing structure is facilitated.

Furthermore, the width D of the plug portion 30 of the present embodiment and the spacing T between the two connection sections 210 preferably satisfy: t is more than or equal to 1.8D and less than or equal to 2.2D. The above-described multiple relationship is adopted between the interval T between the two connection sections 210 and the width D of the plug portion 30, so that the clamping sections 211 are obliquely disposed between the two connection sections 210, thereby forming the accommodation space 20 between the two clamping sections 211, which is sized appropriately for the plug portion 30 to be inserted. Preferably, t=2d is taken.

In summary, in the motor grounding structure of the embodiment, the accommodating portion 2 and the plug 3 are in plug-in fit to form the electrical connection between the motor housing 4 and the grounding line on the circuit board 1 of the motor, so as to realize the grounding arrangement of the motor housing 4 through the grounding line in the external circuit of the motor; by means of the elastic expansion and contraction performance of the plug 3, connection reliability between the plug 3 and the accommodation space 20 of the accommodation portion 2 can be ensured even in the case of vibration of a vehicle to ensure reliable grounding of the motor housing 4, thereby providing a grounding scheme suitable for a metal housing of a small-sized motor for a vehicle.

Example two

The present embodiment relates to a motor and a vehicle, the motor has a motor housing 4 made of metal, and the motor housing 4 adopts the motor grounding structure provided in the first embodiment; the motor of the embodiment is arranged on the vehicle. In this way, in the case where the circuit board 1 is disposed on the insulating base 5, and the circuit board 1 and the motor housing 4 are insulated from each other by the insulating base 5, communication between the motor housing 4 and the ground line on the circuit board 1 is achieved by the ground structure.

With the grounding structure, the accommodating part 2 and the plug 3 are in a pressure connection state, the clamping pieces 21 on the left side and the right side of the accommodating part 2 deform, the plug part 30 is elastically clamped in the left-right direction, and the contact area between the clamping section 211 and the plug part 30 is increased due to the sheet-shaped structure; meanwhile, the elastic structure of the elastic part 31 of the plug 3 ensures good contact between the plug 3 and the accommodating part 2 in the up-down direction (i.e., the insertion direction of the plug 3), allows a certain degree of freedom in deformation, has good vibration resistance, and enhances the durability and reliability of the structure.

In practical application, the connection portion 32 of the plug 3 must be soldered to a ground line on the circuit board 1, and the following rule is referred to for position selection:

the welding point is close to the connector of the motor as much as possible so as to shorten the distance between the plug 3 and the external grounding line;

the grounding circuit for the soldering plug 3 on the circuit board 1 should be avoided as much as possible from being parallel to other circuits, so that the risk of short-circuiting is reduced.

After welding and plug 3 and the grafting of holding part 2 are accomplished, static on the motor casing 4 just can link to each other through the earth connection on holding part 2, plug 3 and circuit board 1, the PIN foot of the connector of motor to link to each other with the automobile body earth connection system of vehicle through the external circuit of motor, ensure that static charge can pass through the automobile body that the PIN foot was released.

With the motor of the present embodiment, the problem of charge accumulation of the motor housing 4, and thus EMC problems, which may be caused when the motor is arranged in, for example, a non-sheet metal region or a plastic bracket must be used, is solved. The design of the metal elastic structure also successfully avoids the problem of insufficient reliability of the relief structure caused by mechanical shake such as vibration.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The utility model provides a motor grounding structure which characterized in that:

comprises a containing part (2) arranged on a motor shell (4) and a plug (3) connected with a grounding line on a circuit board (1) of the motor;

the accommodating part (2) is provided with an accommodating space (20) for accommodating part of the plug (3), and the plug (3) can elastically stretch and retract along a preset direction;

the preset direction is the direction of the plug (3) entering and exiting the accommodating space (20).

2. The motor grounding structure as in claim 1, wherein:

the accommodating part (2) comprises a base plate (22) arranged on the motor shell (4) and a clamping piece (21) arranged on the base plate (22);

the clamping pieces (21) are arranged in two rows oppositely, the accommodating space (20) is formed between the two rows of the clamping pieces (21), and a part of the plug (3) is clamped in the accommodating space (20) by the two rows of the clamping pieces (21).

3. The motor grounding structure as claimed in claim 2, wherein:

each clamping piece (21) comprises a connecting section (210) connected with the base plate (22), and a clamping section (211) connected with the connecting section (210);

the clamping sections (211) are bent relative to the connecting sections (210), an included angle is formed between the clamping sections (211) and the connecting sections (210), and the containing space (20) is defined between the clamping sections (211) on the two rows of clamping sheets (21).

4. A motor grounding structure as set forth in claim 3, wherein:

the distance between the clamping sections (211) on the two rows of clamping pieces (21) is gradually reduced along the direction that the plug (3) enters the accommodating space (20).

5. The motor grounding structure as in claim 4, wherein:

an angle between the connecting section (210) and the clamping section (211) on each clamping piece (21) is between 10 DEG and 30 deg.

6. The motor grounding structure according to any one of claims 3 to 5, characterized in that:

the plug (3) comprises an elastic part (31), a plug part (30) and a connecting part (32) which are respectively arranged at two ends of the elastic part (31);

the plug part (30) is positioned in the accommodating space (20), the connecting part (32) is connected with the circuit board (1), and the elastic part (31) can elastically stretch and retract.

7. The motor grounding structure as in claim 6, wherein:

the plug (3) comprises an elongated plate body;

the plate body has upper segment, middle section and the hypomere that connects gradually, the upper segment constitutes plug portion (30), the middle section constitutes elastic part (31), the hypomere constitutes connecting portion (32), just the middle section is crooked form.

8. The motor grounding structure as in claim 7, wherein:

the upper section is U-shaped with an opening facing away from the accommodating space (20);

and/or, the middle section is serpentine;

and/or the lower section is bent and comprises a bottom plate (320) connected with the circuit board (1) and a connecting plate (321) connected with the middle section.

9. An electric motor having a motor housing (4) of metallic material, characterized in that:

the motor housing (4) employs the motor grounding structure of any one of claims 1 to 8.

10. A vehicle, characterized in that:

the motor of claim 9 is provided on the vehicle.