Assembly structure of coupling line and brushless motor comprising same

Abstract

The utility model discloses a kind of assembly structure of coupling line and brushless motor comprising it, including wire protection box, control panel and the plastic package shell of wire protection box and control panel plastic package fixed, wire protection box has the wire slot of through both sides, coupling line passes through wire slot, the surface of wire protection box has the vent hole being communicated with wire slot, the vent hole is located at the outside of plastic package shell.The utility model is by being set up the vent hole being communicated with wire slot on wire protection box, gas generated in high temperature during injection molding is discharged along vent hole, solve the problem of overflow and injection molding incompletely of injection molding material through wire slot when high-temperature injection molding.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an assembly structure for a connecting wire and a brushless motor including the same. Background Technology

[0002] In motor assembly, the connecting wires are first connected to the control board and pass through the cable guard box. Finally, the control board, cable guard box, and stator assembly are injection molded into one piece. In the existing technology, the cable passage in the cable guard box and the connecting wires mostly adopt an interference fit design structure. This interference fit design structure will form a relatively closed space inside the cable guard box. The gas generated by the high temperature during the injection molding process cannot be discharged quickly. If the injection pressure is too high, it will break the cable sheath and cause overflow. If the injection pressure is too low, it will reduce the fluidity of the injection molding material and cause defects in the injection molding.

[0003] Secondly, the existing assembly structure of the cable guard box and control board does not take into account the optimization of space utilization. As a result, the overall size after assembly is large, which leads to a noticeable protrusion at the motor cable outlet, which is not conducive to the miniaturization design of the motor and also affects the aesthetic appearance of the motor. Utility Model Content

[0004] To address the technical problem in existing technologies where the connecting wire and the protective box are sealed together, high-temperature gases cannot escape during injection molding, leading to the connecting wire being easily broken or incomplete injection molding, this utility model provides an assembly structure for the connecting wire and a brushless motor containing the same to solve the above problems.

[0005] This utility model proposes an assembly structure for a connecting cable, including a cable guard box, a control board, and a plastic-encapsulated shell that fixes the cable guard box and the control board together. The cable guard box has a through-hole for the cable passing through both sides, and the connecting cable passes through the through-hole. The surface of the cable guard box has a vent hole that communicates with the through-hole, and the vent hole is located outside the plastic-encapsulated shell.

[0006] In an optional embodiment of this utility model, the cable protection box includes an upper box body and a lower box body. The upper box body includes a cable clamp and a fixing plate. The cable clamp has an upper groove forming a cable passage groove. An exhaust hole is located on the cable clamp. The cable clamp and the lower box body are covered by the upper and lower boxes. The fixing plate is located at one end of the cable clamp along the extension direction of the cable passage groove. The end of the lower box body abuts against the control plate. The fixing plate is placed above the control plate.

[0007] In an optional embodiment of this utility model, the lower surface of the fixing plate has a mounting post, and the control plate has a mounting hole that is interference-fitted with the mounting post.

[0008] In an optional embodiment of this utility model, the control board includes a component mounting part and a connecting part connected to the outer edge of the component connecting part. The connecting part is provided with a connecting hole for mounting connecting wires. The mounting hole is located on both sides of the connecting hole. The lower box body abuts against the side of the connecting part, and the fixing plate is placed on the upper surface of the connecting part.

[0009] In an optional embodiment of this utility model, the connecting part is rectangular.

[0010] In an optional embodiment of this utility model, the vent hole passes through the clamp in the vertical direction.

[0011] In an optional embodiment of this utility model, the wire clamp includes two protruding portions on both sides and an inwardly recessed portion located between the two protruding portions. The upper groove is located in the inwardly recessed portion. The fixing plate has a limiting boss located at one end of the inwardly recessed portion and protruding downwards towards the box body. The lower box body includes an abutting portion that abuts against the protruding portion and an outwardly protruding portion that abuts against the inwardly recessed portion. The limiting boss abuts against the side of the outwardly protruding portion.

[0012] In an optional embodiment of this utility model, the protrusion is flush with the lower surface of the fixing plate.

[0013] In an optional embodiment of this utility model, the abutting portion has a positioning post that fits with the vent hole with a clearance.

[0014] In an optional embodiment of this utility model, the inner surface of the wire groove is provided with annular ribs.

[0015] In an optional embodiment of this utility model, the wire clamp and the fixing plate are integrally formed.

[0016] This utility model also proposes a brushless motor, including the assembly structure of the connecting wires described above.

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

[0018] (1) This utility model solves the problem of overflow of the injection molding material and incomplete injection during high-temperature injection by setting an exhaust hole on the wire protection box that is connected to the wire passage groove. The gas generated at high temperature during injection molding is discharged through the exhaust hole.

[0019] (2) The present invention uses a protruding fixing plate in the upper box to enable the wire protection box and the control board to be installed in a staggered manner, thereby saving space after the parts are assembled, improving installation flexibility, and saving product cost.

[0020] (3) In this utility model, the upper box and the lower box can be quickly installed and positioned through the design of positioning columns and limiting bosses, thereby improving assembly efficiency and installation yield. 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 perspective view of the assembly structure of the connecting wire described in this utility model (not shown in the plastic casing);

[0023] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the assembly structure of the connecting line shown;

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

[0025] Figure 4 This is a perspective view of the upper box body in this utility model;

[0026] Figure 5 This is a perspective view of the lower box body of this utility model;

[0027] Figure 6 This is an external view of a specific embodiment of the brushless motor described in this utility model;

[0028] Figure 7 This is an axial sectional view of the brushless motor described in this utility model.

[0029] In the diagram, 1. Cable guard box, 101. Upper box body, 102. Lower box body, 1021. Abutting part, 1022. Outer protrusion, 2. Control board, 201. Component mounting part, 202. Connecting part, 203. Mounting hole, 204. Connecting hole, 3. Plastic encapsulated shell, 4. Cable groove, 401. Upper groove, 402. Lower groove, 5. Connecting wire, 6. Vent hole, 7. Wire clamp, 701. Protrusion, 702. Inner recess, 8. Fixing plate, 801. Mounting post, 802. Limiting boss, 9. Positioning post, 10. Semi-circular rib, 11. Stator assembly, 12. Rotor assembly, 13. Front cover plate, 14. Rear cover plate. Detailed Implementation

[0030] 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.

[0031] Example 1

[0032] An assembly structure for a connecting wire, such as Figure 1 and Figure 6As shown, the assembly of the connecting wire 5 with the control board 2 and the wire protection box 1 is encapsulated in a single piece. The assembly includes the wire protection box 1, the control board 2, and the encapsulated housing 3 that fixes the wire protection box 1 and the control board 2 in a plastic seal. After encapsulation, part of the structure of the wire protection box 1 is exposed. The wire protection box 1 has a wire passage groove 4 that runs through both sides. One end of the connecting wire 5 is fixed to the control board 2, and the other end passes through the wire passage groove 4 and is led outward. The surface of the wire protection box 1 has a vent hole 6 that communicates with the wire passage groove 4. The vent hole 6 is located outside the encapsulated housing 3.

[0033] When the connecting cable 5 is installed and injection molding is performed, the exposed part of the cable protection box 1 is separated by the limiting of the injection mold, so that the vent 6 is located outside the plastic encapsulation shell 3. The high temperature gas generated during the encapsulation process enters the cable groove 4 and can be quickly discharged out through the vent 6, thereby reducing the impact on the connecting cable 5. When selecting the injection pressure, the primary condition can be whether the injection plastic can fill the entire injection space, without worrying that the injection pressure will damage the connecting cable 5.

[0034] The cable protection box 1 can be a one-piece structure. However, to facilitate the installation of the connecting wire 5, the cable protection box 1 typically adopts a split structure, comprising an upper box body 101 and a lower box body 102. This utility model uses... Figure 1 and Figure 2 The orientation shown is the arrangement in the working state. The upper box 101 is located above the lower box 102. The upper groove 401 at the bottom of the upper box 101 and the lower groove 402 at the top of the lower box 102 form the wire passage groove 4. The vent 6 can be located in the upper box 101 or the lower box 102, as long as it is connected to the wire passage groove 4.

[0035] The control board 2 typically includes a component mounting section 201 and a connecting section 202 that connects to one side of the outer edge of the component connecting section 202. The connecting section 202 is provided with a connecting hole 204 for mounting the connecting wire 5, such as... Figure 3 As shown, there are three connection holes 204 for welding and fixing with three-phase leads. The component mounting part 201 is used to fix various components. The component mounting part 201 is adapted to the inner surface of the motor housing.

[0036] The cable protection box 1 can be directly stacked on the control board 2 in the same way as in the conventional method.

[0037] Example 2

[0038] The improvement in this embodiment lies in the positional relationship between the cable guard box 1 and the control board 2. In traditional motors, the cable guard box 1 has a relatively flat surface and is often directly stacked on the control board 2 without considering the spatial layout. With the development of motor miniaturization, the arrangement of various components inside the motor needs to be rationally designed. In addition, the cable guard box 1 in the traditional structure often protrudes as a whole on the surface of the motor, affecting the aesthetic appearance of the motor.

[0039] Therefore, this embodiment adopts a structure in which the cable protection box 1 and the control board 2 are staggered, that is, the upper box body 101 and the lower box body 102 in the cable protection box 1 are of different lengths, thus forming a stagger. The specific structure is as follows:

[0040] like Figures 2-4 As shown, the upper box 101 includes a wire clamp 7 and a fixing plate 8. The wire clamp 7 and the fixing plate 8 are preferably integrally formed. The wire clamp 7 has an upper groove 401 that forms a wire passage groove 4. The function of the wire clamp 7 is to form a wire passage groove 4 that clamps the connecting wire 5 after it is closed with the lower box 102. The vent hole 6 is located on the wire clamp 7. The vent hole 6 only needs to be able to connect the wire passage groove 4 and the outside of the wire clamp 7. The vent hole 6 can be arranged to extend along the wire clamp 7 in any direction. In this embodiment, the vent hole 6 passes through the wire clamp 7 in the vertical direction. In other optional embodiments, the vent hole 6 can also extend in the form of a broken line or a curve. The plastic-encased shell 3 covers part of the wire clamp 7, but does not cover the location of the vent 6. The fixing plate 8 is located at one end of the wire clamp 7 along the extension direction of the wire groove 4. The function of the fixing plate 8 is to connect with the control plate 2. The fixing plate 8 protrudes outward relative to the lower box 102. That is, in the axial direction of the wire groove 4, the length of the upper box 101 is greater than the length of the lower box 102, thus forming a misaligned structure between the two. The fixing plate 8 and the lower box 102 form an L-shaped misaligned space, which is respectively attached to the two vertical surfaces of the control plate 2. The end of the lower box 102 abuts against the side of the control plate 2, and the fixing plate 8 is placed above the control plate 2.

[0041] like Figure 2 As shown, the side of the connecting part 202 of the control board 2 is attached to the side of the lower box 102, and the upper surface is attached to the fixing plate 8. The surface of the connecting part 202 that is attached to the lower box 102 and the fixing plate 8 is a plane. Other surfaces of the connecting part 202 can be irregular surfaces. Since the connecting part 202 needs to extend outside the motor, for aesthetic reasons and to facilitate the processing of wiring holes on the motor, the connecting part 202 is preferably rectangular.

[0042] This structural design allows half the height of the cable guard box 1 to coincide with the control board 2, thereby reducing the overall thickness of the cable guard box 1 and the control board 2, and consequently reducing the thickness of the plastic encapsulation shell 3. This not only saves space but also saves injection molding materials. Furthermore, since the cable guard box 1 extends along the direction parallel to the control board 2, after the motor is assembled, there is only a thin protruding structure on the outside of the motor, which is more suitable for the design of micro motors.

[0043] Example 3

[0044] To accelerate the assembly speed and improve the assembly accuracy of the cable protection box 1 and the control board 2, this embodiment adds a positioning and limiting structure based on embodiment two.

[0045] Regarding the installation of the upper housing 101 and the control board 2:

[0046] The lower surface of the fixing plate 8 has a mounting post 801, and the control plate 2 has a mounting hole 203 that is interference-fitted with the mounting post 801. Figure 2 and Figure 3 As shown, the mounting hole 203 is a round hole, and there are two mounting holes 203, located on both sides of the three connecting holes 204. The upper box 101 and the control board 2 are fixed by the interference fit between the mounting post 801 and the mounting hole 203 to prevent relative movement between the two during the plastic sealing process.

[0047] Installation of the upper housing 101 and the lower housing 102:

[0048] like Figure 4 and Figure 5 As shown, the wire clamp 7 includes two protrusions 701 on both sides and a recessed portion 702 located between the two protrusions 701 and recessed inward. The upper groove 401 is located in the recessed portion 702. The fixing plate 8 has a limiting boss 802 located at one end of the recessed portion 702 and protruding downward toward the lower housing 102. The lower housing 102 includes an abutting portion 1021 that abuts against the protrusions 701 and an outer protrusion 1022 that abuts against the recessed portion 702. The limiting boss 802 abuts against the side of the outer protrusion 1022. The recessed portion is recessed inward relative to the protrusions 701 and the limiting boss 802, thereby limiting the protrusions 701 and the limiting boss 802 in the lateral and longitudinal directions of the outer protrusion 1022. This allows for accurate control of the misalignment length between the upper housing 101 and the lower housing 102, facilitating quick installation and improving installation accuracy.

[0049] In a further design, the abutment part 1021 has a positioning post 9 that fits with the vent hole 6 with a clearance, which initially positions the lower box 102 and the upper box 101 to prevent the lower box 102 from being displaced by impact during the injection molding process.

[0050] In a preferred embodiment, the protrusion 701 and the lower surface of the fixing plate 8 are flush. When assembled with the control plate 2, the lower surface of the fixing plate 8 is attached to the upper surface of the connecting part 202, and the abutting part 1021 of the lower box 102 can be flush with the upper surface of the control plate 2. At this time, when the thickness of the control abutting part 1021 is the same as that of the control plate 2, the wire protection box 1 can be flush with the lower surface of the control plate 2. After the two are assembled, they are superimposed to form a regular rectangle.

[0051] The fixed plate 8 can be a regular rectangular plate or an irregular plate, such as... Figure 4 As shown, one end of the fixing plate 8 connecting the clamp 7 is a long strip plate, the middle of which is a limiting boss 802. The other end of the fixing plate 8 is a rectangular plate that extends with the same width as the two protrusions 701. A mounting post 801 is provided on each of the two rectangular plates.

[0052] Normally, the inner surface of the wire groove 4 is provided with annular ribs, which press the connecting wire 5 tightly. In this utility model, the annular ribs are composed of semi-annular ribs 10 in the upper groove 401 and the lower groove 402 respectively.

[0053] Example 4

[0054] A type of brushless motor, such as Figure 6 and Figure 7 As shown, the assembly structure includes a stator assembly 11, a rotor assembly 12, a front cover plate 13, a rear cover plate 14, and the aforementioned connecting wires. A plastic-encapsulated housing 3 encapsulates the stator assembly 11 and the control board 2 and the cable guard box 1 within the connecting wire assembly structure, forming a single unit. Figure 7 As can be seen, the cable protection box 1 and the plastic-encased shell 3 are relatively thin and have a short protrusion length, thus occupying less space.

[0055] In the description of this utility model, it should be understood that the terms "length", "thickness", "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] 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.

[0057] 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. An assembly structure for a connecting wire, characterized in that: The device includes a cable guard box (1), a control board (2), and a plastic-sealed housing (3) that fixes the cable guard box (1) and the control board (2) in plastic. The cable guard box (1) has a cable passage groove (4) that runs through both sides. The connecting wire (5) passes through the cable passage groove (4). The surface of the cable guard box (1) has an exhaust hole (6) that communicates with the cable passage groove (4). The exhaust hole (6) is located outside the plastic-sealed housing (3).

2. The assembly structure of the connecting wire according to claim 1, characterized in that: The cable protection box (1) includes an upper box body (101) and a lower box body (102). The upper box body (101) includes a wire clamp (7) and a fixing plate (8). The wire clamp (7) has an upper groove (401) forming a wire passage groove (4). An exhaust hole (6) is located on the wire clamp (7). The wire clamp (7) and the lower box body (102) are covered by each other. The fixing plate (8) is located at one end of the wire clamp (7) along the extension direction of the wire passage groove (4). The end of the lower box body (102) abuts against the control plate (2). The fixing plate (8) is placed above the control plate (2).

3. The assembly structure of the connecting wire according to claim 2, characterized in that: The lower surface of the fixing plate (8) has a mounting post (801), and the control plate (2) has a mounting hole (203) that is interference-fitted with the mounting post (801).

4. The assembly structure of the connecting wire according to claim 3, characterized in that: The control board (2) includes a component mounting part (201) and a connecting part (202) connected to one side of the outer edge of the component connecting part (202). The connecting part (202) is provided with a connecting hole (204) for mounting connecting line (5). The mounting hole (203) is located on both sides of the connecting hole (204). The lower box body (102) abuts against the side of the connecting part (202). The fixing plate (8) is placed on the upper surface of the connecting part (202).

5. The assembly structure of the connecting wire according to claim 4, characterized in that: The connecting part (202) is rectangular.

6. The assembly structure of the connecting wire according to claim 2, characterized in that: The vent (6) passes through the clamp (7) in the vertical direction.

7. The assembly structure of the connecting wire according to claim 2, characterized in that: The wire clamp (7) includes two protrusions (701) on both sides and an inwardly recessed portion (702) located between the two protrusions (701). The upper groove (401) is located in the inwardly recessed portion (702). The fixing plate (8) has a limiting boss (802) located at one end of the inwardly recessed portion (702) and protruding towards the lower box body (102). The lower box body (102) includes an abutting portion (1021) that abuts against the protrusions (701) and an outwardly protruding portion (1022) that abuts against the inwardly recessed portion (702). The limiting boss (802) abuts against the side of the outwardly protruding portion (1022).

8. The assembly structure of the connecting wire according to claim 7, characterized in that: The protrusion (701) and the lower surface of the fixing plate (8) are flush.

9. The assembly structure of the connecting wire according to claim 7, characterized in that: The abutment part (1021) has a positioning post (9) that fits with the vent hole (6) with a clearance.

10. The assembly structure of the connecting wire according to claim 1, characterized in that: The inner surface of the wire groove (4) is provided with annular ribs.

11. The assembly structure of the connecting wire according to claim 2, characterized in that: The wire clamp (7) and the fixing plate (8) are integrally formed.

12. A brushless motor, characterized in that: The assembly structure includes the connecting wire as described in any one of claims 1-11.

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