Connection structure of circuit board and terminal shell and brushless motor comprising connection structure

Abstract

The utility model discloses a connecting structure of a circuit board and a terminal shell and a brushless motor comprising the same, the connecting structure comprises a first circuit board, a second circuit board and a terminal shell, the first circuit board is provided with a connecting hole and a bonding pad; one end of the second circuit board is provided with a connector inserted into the connecting hole, and the connector is electrically connected with the first circuit board; a bottom plate of the terminal shell is placed on the first circuit board, the bottom plate is provided with an insertion hole for the second circuit board to be inserted, the terminal shell is provided with an elastic buckle plate and an outer plate which are located on the two sides of the insertion hole, and the insertion terminal is pressed tightly by the elastic buckle plate and the outer plate in the normal direction of the second circuit board; and the second circuit board and the first circuit board are welded and fixed and then assembled with the terminal shell. According to the utility model, the traditional pin is replaced by the second circuit board, and the jack matched with the second circuit board is arranged on the terminal shell, so that the traditional assembly sequence can be changed, the first circuit board and the second circuit board are welded and then assembled with the terminal shell, and the deformation of the terminal shell is avoided.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and in particular to a connection structure between a circuit board and a terminal housing, and a brushless motor containing the same. Background Technology

[0002] With the development of technology, brushless motors are increasingly used in various fields, especially in the dishwasher industry. In order to increase service life, reduce noise, and improve user comfort, brushless motors are increasingly being used in the internal drain pumps of dishwashers to replace the previously used AC synchronous motors.

[0003] Currently, to better match the connection method at one end of a dishwasher, brushless motors often use a soldering method between the circuit board and the pins on the terminal housing. These pins are metal needle-like structures, making it difficult to fix them to the terminal housing through simple plugging; soldering is required. For ease of installation, the pins are typically fixed to the terminal housing at the factory before shipping, and then the terminal housing with the pins is assembled to the circuit board. However, because the terminal housing is made of plastic, prolonged soldering time can cause the terminal housing in contact with the pins to deform due to heat.

[0004] In addition, in the prior art, when the terminal shell and the plug-in terminal are assembled, the plug-in terminal directly contacts the outer shell of the terminal shell. When the terminal shell and the circuit board are integrally injection molded, there may be a risk of material leakage and deformation of the outer shell of the terminal shell. Utility Model Content

[0005] To address the technical problem that the terminal shell deforms due to heat when soldering the pins fixed to the terminal shell to the circuit board due to excessive soldering time in the existing technology, this utility model provides a connection structure between the circuit board and the terminal shell, and a brushless motor containing the same to solve the above problem.

[0006] This utility model proposes a connection structure between a circuit board and a terminal shell, including a first circuit board, a second circuit board, and a terminal shell. The first circuit board has multiple connection holes and pads connected to the connection holes. One end of the second circuit board has a connector for inserting into the connection holes, and the connector is electrically connected to the first circuit board. The bottom plate of the terminal shell is placed on the first circuit board, and the bottom plate has a socket for inserting the second circuit board. The terminal shell has spring-loaded plates and an outer plate located on both sides of the socket. The plug-in terminal is pressed by the spring-loaded plates and the outer plate along the normal direction of the second circuit board. The second circuit board is welded and fixed to the first circuit board and then assembled with the terminal shell.

[0007] In an optional embodiment of this utility model, the welding surface of the connector to the first circuit board is located on the side of the first circuit board opposite to the terminal shell.

[0008] In an optional embodiment of this utility model, the first circuit board is provided with a terminal housing positioning hole, and the bottom plate of the terminal housing has a positioning post that extends into the terminal housing positioning hole.

[0009] In an optional embodiment of this utility model, the terminal housing positioning hole and the connection hole are arranged side by side.

[0010] In an optional embodiment of this utility model, the first circuit board includes a fixing part and a connecting part arranged on the same plane. The connecting hole and the terminal housing positioning hole are located in the connecting part, the solder pad is located in the fixing part, the center of the fixing part has an injection molding through hole, and the surface of the fixing part has a housing positioning hole.

[0011] In an optional embodiment of this utility model, the inner side of the outer plate has a slot for inserting a snap-fit ​​terminal.

[0012] In an optional embodiment of this utility model, the end of the spring-loaded plate facing the first circuit board has a pressure block that abuts against the plug-in terminal, and the upper surface of the pressure block is chamfered.

[0013] In an optional embodiment of this utility model, a vertically extending mounting plate is connected to the base plate, the top of the mounting plate has a downwardly extending groove, a spring clip is formed between two grooves, and a reinforcing rib is provided on the side of the mounting plate below each groove.

[0014] In an optional embodiment of this utility model, the terminal housing further includes an outer baffle, a spring-loaded plate is located between the outer plate and the outer baffle, and a deformation space is left between the spring-loaded plate and the outer baffle.

[0015] In an optional embodiment of this utility model, the second circuit board is a rectangular panel, and the connector protrudes from the outer edge of the rectangular panel.

[0016] This utility model also proposes a brushless motor, including a stator assembly, a rotor assembly, a motor housing assembly, a first circuit board, a terminal housing, and plug-in terminals. The first circuit board is connected to the stator assembly, and the first circuit board and the terminal housing are connected by the connection structure between the circuit board and the terminal housing described above.

[0017] The beneficial effects of this utility model are:

[0018] (1) This utility model replaces the traditional pin with a second circuit board and sets a socket on the terminal shell to cooperate with the second circuit board, thereby changing the traditional assembly sequence. The first circuit board and the second circuit board are welded together and then assembled with the terminal shell to avoid deformation of the terminal shell. At the same time, the terminal shell achieves the assembly of the plug-in terminal through the cooperation of the spring buckle plate and the outer plate, which reduces the overall injection molding and assembly difficulty.

[0019] (2) The present invention directly attaches the bottom plate of the terminal shell to the surface of the first circuit board, with no gap between them, which greatly increases the reliability during injection molding.

[0020] (3) The present invention has an outer baffle on the outside of the spring buckle plate. When the whole machine is plastic sealed, the outer baffle can block the risk of external material leakage and deformation, avoid deformation of the spring buckle plate, and improve the reliability of the assembly of the terminal shell and the plug terminal. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a front perspective view of the assembly of the first circuit board and the second circuit board in this utility model;

[0023] Figure 2 This is a front perspective view of the first circuit board in this utility model;

[0024] Figure 3 This is a perspective view of the second circuit board in this utility model;

[0025] Figure 4 This is a schematic diagram of the back of the assembly of the first circuit board and the second circuit board in this utility model;

[0026] Figure 5 This is a perspective view of the terminal housing of this utility model viewed from the top;

[0027] Figure 6 This is a perspective view of the terminal housing of this utility model viewed from the bottom;

[0028] Figure 7 This is a perspective view of the terminal housing of this utility model from the top.

[0029] Figure 8 This is an exploded view of the brushless motor in this utility model;

[0030] Figure 9 This is an assembly diagram of the connection structure between the circuit board and the terminal housing described in this utility model.

[0031] In the diagram, 1 is the first circuit board, 101 is the fixing part, 102 is the connecting part, 2 is the second circuit board, 201 is the connector, 3 is the terminal shell, 301 is the base plate, 302 is the insertion hole, 303 is the spring clip plate, 304 is the outer plate, 305 is the reinforcing rib, 306 is the slot, 307 is the positioning post, 308 is the pressure block, 3081 is the chamfer, 309 is the outer baffle, 310 is the deformation space, 311 is the slot, 4 is the connecting hole, 5 is the solder pad, 6 is the injection molding through hole, 7 is the housing positioning hole, 8 is the terminal shell positioning hole, 9 is the stator assembly, 10 is the rotor assembly, and 11 is the motor housing assembly. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] Example 1

[0034] like Figures 1-7 and Figure 8 As shown, a connection structure between a circuit board and a terminal housing includes a first circuit board 1, a second circuit board 2, and a terminal housing 3. The first circuit board 1 has multiple connection holes 4 and solder pads 5 connected to the connection holes 4. One end of the second circuit board 2 has a connector 201 that inserts into the connection holes 4. The connector 201 is electrically connected to the first circuit board 1. There are three connectors 201. The metal part of each connector 201 is connected to three leads of the winding through the solder pads 5 on the first circuit board 1. The plug-in terminal is connected to the first circuit board 1, thereby realizing the electrical connection between the external power supply and the winding. The base plate 301 of the terminal housing 3 is placed on the first circuit board 1. The base plate 301 has a socket 302 for the second circuit board 2 to be inserted. The terminal housing 3 has a spring-loaded plate 303 and an outer plate 304 located on both sides of the socket 302. The plug-in terminal is pressed by the spring-loaded plate 303 and the outer plate 304 along the normal direction of the second circuit board 2. The second circuit board 2 is welded and fixed to the first circuit board 1 and then assembled with the terminal housing 3.

[0035] This invention replaces the three pins in the prior art with a plate-shaped circuit board. Only one elongated insertion hole 302 is needed on the terminal housing 3 for the second circuit board 2 to pass through, thus simplifying the internal structure of the terminal housing 3. Compared with the pins with smaller cross-sectional areas, the contact surface between the second circuit board 2 and the insertion hole 302 of the terminal housing 3 is larger, resulting in a better limiting effect. Initial fixation can be achieved by plugging, without the need for welding. This changes the installation order of the pins, terminal housing 3, and circuit board. The connector 201 (equivalent to the pins in the prior art) of the first circuit board 1 and the second circuit board 2 can be welded and fixed first, and then the second circuit board 2 and the terminal housing 3 can be plugged and initially fixed. Finally, the three are injection molded as a whole. This avoids deformation at the contact point between the metal parts of the terminal housing 3 and the second circuit board 2 when the first circuit board 1 and the second circuit board 2 are welded.

[0036] Furthermore, in the prior art, the plug-in terminal can be fixed to the terminal housing 3 by plugging in with the partition. Since the present invention uses a long strip-shaped plug hole 302, there is no partition separating the plug pins inside the terminal housing 3. Therefore, it is replaced by pressing the plug-in terminal with a spring-loaded plate 303 and an outer plate 304 along the normal direction of the second circuit board 2. The spring-loaded plate 303 refers to a plate with a certain elasticity. The plug-in terminal is pressed by the elasticity of the spring-loaded plate 303.

[0037] The outer side of the plug-in terminal usually has a snap fastener. Therefore, in this embodiment, a slot 311 for inserting the snap fastener of the plug-in terminal is preferably provided on the inner side of the outer plate 304. The slot 311 can limit the left and right direction of the snap fastener, so that the plug-in terminal can accurately contact the metal parts on the second circuit board 2, and can also improve the stability of the connection between the plug-in terminal and the terminal shell 3.

[0038] The second circuit board 2 is typically arranged perpendicular to the first circuit board 1, and the connector 201 is also inserted vertically into the connector hole 4. Therefore, the soldering surface of the connector 201 to the first circuit board 1 is located on the back of the first circuit board 1 (e.g., Figure 4 As shown in the figure, that is, the side of the first circuit board 1 that is opposite to the terminal housing 3. At this time, both sides of the first circuit board 1 are wiring surfaces.

[0039] First circuit board 1:

[0040] The terminal housing 3 is typically mounted on one side of the first circuit board 1; therefore, the first circuit board 1 typically includes a fixing portion 101 and a connecting portion 102 arranged on the same plane, such as... Figure 1 and Figure 2 As shown, the connecting hole 4 is located in the connecting part 102, and the solder pad 5 is located in the fixing part 101. The fixing part 101 has an injection molding through hole 6 at its center. The shape of the fixing part 101 is set according to the shape of the stator assembly 9 and the position of the winding lead wire. The connecting part 102 is used to install the terminal assembly. The terminal assembly consists of a terminal shell 3, a pin, and a plug-in terminal. The injection molding through hole 6 is used to allow the first circuit board 1 to pass through the molding die post, facilitating demolding. The surface of the fixing part 101 can also be provided with a housing positioning hole 7, which is used to facilitate determining the welding height between the first circuit board 1 and the stator assembly 9 and increase welding efficiency.

[0041] The main body of the second circuit board 2 is a rectangular thin plate, the connector 201 extends from the bottom of the second circuit board 2, and the socket 302 is a rectangular hole that matches the second circuit board 2.

[0042] The spring clip plate 303 can be formed in the following way:

[0043] like Figure 5 and Figure 7As shown, a vertically extending mounting plate is connected to the base plate 301. The top of the mounting plate has a downwardly extending slot 306, and a spring-loaded plate 303 is formed between two slots 306. That is, there is no connecting structure to support the two sides of the spring-loaded plate 303, so that the spring-loaded plate 303 can have elasticity to move back and forth. In order to avoid the spring-loaded plate 303 from deforming under pressure when installing the plug-in terminal and causing the connection between the mounting plate and the base plate 301 to break, it is preferable to provide a reinforcing rib 305 on the side of the mounting plate located below each slot 306. In a further design, in order to enhance the clamping effect, the end of the spring-loaded plate 303 facing the first circuit board 1 has a pressure block 308 that abuts against the plug-in terminal. The pressure block 308 can reduce the distance between the spring-loaded plate 303 and the outer plate 304, and can clamp the plug-in terminal pressure block 308 without the spring-loaded plate 303 needing to deform too much. The upper surface of the pressure block 308 preferably has a chamfer 3081 to provide a guiding function for the installation of the plug-in terminal.

[0044] The terminal housing 3 includes a base plate 301 and four side plates. The second circuit board 2 and the plug-in terminals can be enclosed in the space formed by the four side plates. In this embodiment, the outer plate 304 is one of the side plates of the terminal housing 3, and the spring-loaded plate 303 can be another side plate of the terminal housing 3 that is directly opposite the outer plate 304.

[0045] Example 2

[0046] Based on Example 1, such as Figure 2 and Figure 6 As shown, the first circuit board 1 is provided with a terminal housing positioning hole 8, and the bottom plate 301 of the terminal housing 3 has a positioning post 307 that extends into the terminal housing positioning hole 8. This allows for quick positioning of the terminal housing 3 and the first circuit board 1, and also makes the assembly of the terminal housing 3 and the second circuit board 2 more stable, preventing the terminal housing 3 from shaking or shifting during injection molding. The terminal positioning hole is located on the connecting part 102, and preferably the terminal housing positioning hole 8 and the connecting hole 4 are arranged side by side.

[0047] Example 3

[0048] In the above embodiments, such as Figure 5 As shown, when the terminal housing 3 is integrally injection molded with the circuit board, there is a risk of material leakage and deformation on the side plate of the terminal housing 3. If the spring-loaded plate 303 is a side plate, its elasticity will make it more prone to deformation, thereby reducing the installation space of the plug-in terminal and making it easy for the plug-in terminal to fail to be installed. Therefore, this embodiment makes the following improvements based on embodiment one or embodiment two:

[0049] The terminal housing 3 also includes an outer baffle 309, and a spring-loaded plate 303 is located between the outer plate 304 and the outer baffle 309, with a deformation space 310 between the spring-loaded plate 303 and the outer baffle 309. The outer baffle 309 can resist the risk of deformation caused by material leakage during molding. Even if the outer baffle 309 undergoes slight deformation, it will not come into contact with the spring-loaded plate 303, thus protecting the spring-loaded plate 303.

[0050] Example 4

[0051] A type of brushless motor, such as Figure 8 As shown, it includes a stator assembly 9, a rotor assembly 10, a motor housing assembly 11, a first circuit board 1, a terminal housing 3, and plug-in terminals. The first circuit board 1 is connected to the stator assembly 9, and the first circuit board 1 and the terminal housing 3 are connected by the circuit board and terminal housing connection structure described above.

[0052] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0054] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A connection structure between a circuit board and a terminal housing, characterized in that, include: The first circuit board (1) has a plurality of connection holes (4) and solder pads (5) connected to the connection holes (4); The second circuit board (2) has a connector (201) with an insertion connection hole (4) at one end, and the connector (201) is electrically connected to the first circuit board (1); Terminal housing (3); The base plate (301) of the terminal housing (3) is placed on the first circuit board (1), the base plate (301) has a socket (302) for the second circuit board (2) to be inserted, the terminal housing (3) has a spring-loaded plate (303) and an outer plate (304) located on both sides of the socket (302), and the plug-in terminal is pressed by the spring-loaded plate (303) and the outer plate (304) along the normal direction of the second circuit board (2); The second circuit board (2) is welded and fixed to the first circuit board (1) and then assembled with the terminal shell (3).

2. The connection structure between the circuit board and the terminal housing according to claim 1, characterized in that: The welding surface of the connector (201) to the first circuit board (1) is located on the side of the first circuit board (1) that is opposite to the terminal shell (3).

3. The connection structure between the circuit board and the terminal housing according to claim 1, characterized in that: The first circuit board (1) is provided with a terminal housing positioning hole (8), and the bottom plate (301) of the terminal housing (3) has a positioning post (307) that extends into the terminal housing positioning hole (8).

4. The connection structure between the circuit board and the terminal housing according to claim 3, characterized in that: The terminal housing positioning hole (8) and the connection hole (4) are arranged side by side.

5. The connection structure between the circuit board and the terminal housing according to claim 3, characterized in that: The first circuit board (1) includes a fixing part (101) and a connecting part (102) arranged on the same plane. The connecting hole (4) and the terminal housing positioning hole (8) are located in the connecting part (102). The solder pad (5) is located in the fixing part (101). The center of the fixing part (101) has an injection molding through hole (6). The surface of the fixing part (101) has a housing positioning hole (7).

6. The connection structure between the circuit board and the terminal housing according to claim 1, characterized in that: The inner side of the outer plate (304) has a slot (311) for inserting a snap-fit ​​terminal.

7. The connection structure between the circuit board and the terminal housing according to claim 1, characterized in that: The snap plate (303) has a pressure block (308) at one end facing the first circuit board (1) that abuts against the plug-in terminal, and the upper surface of the pressure block (308) is provided with a chamfer (3081).

8. The connection structure between the circuit board and the terminal housing according to claim 1, characterized in that: A vertically extending mounting plate is connected to the base plate (301). The top of the mounting plate has a downward extending slot (306), and a snap-fit ​​plate (303) is formed between the two slots (306). A reinforcing rib (305) is provided on the side of the mounting plate below each slot (306).

9. The connection structure between the circuit board and the terminal housing according to claim 1, characterized in that: The terminal housing (3) also includes an outer baffle (309), a spring-loaded plate (303) is located between the outer plate (304) and the outer baffle (309), and a deformation space (310) is left between the spring-loaded plate (303) and the outer baffle (309).

10. The connection structure between the circuit board and the terminal housing according to claim 1, characterized in that: The second circuit board (2) is a rectangular panel, and the connector (201) protrudes from the outer edge of the rectangular panel.

11. A brushless motor, characterized in that: It includes a stator assembly (9), a rotor assembly (10), a motor housing assembly (11), a first circuit board (1), a terminal housing (3), and plug-in terminals. The first circuit board (1) is connected to the stator assembly (9), and the first circuit board (1) and the terminal housing (3) are connected by the connection structure of the circuit board and the terminal housing as described in any one of claims 1-10.

Images