Terminal sealing structure

Abstract

The invention provides a terminal sealing structure, which is used for realizing sealing connection between a busbar terminal and a motor shell with an accommodating space, the shell comprises a shell body and an end cover, the end cover is provided with a terminal outlet hole, the busbar terminal comprises a body part and an extension part, the body part is arranged in the accommodating space, and the extension part is arranged in the accommodating space. The extension part extends from the body part and penetrates out of the terminal hole; the terminal sealing structure comprises a rubber coating body and a soft rubber sleeve sleeved outside the rubber coating body; the rubber wrapping body wraps and covers the peripheral side of the extension part, and the soft rubber sleeve is elastically arranged on the periphery of the rubber wrapping body in a sleeving mode and forms circumferential wrapping; after the rubber coating body and the soft rubber sleeve are assembled in advance, the end cover and the shell body are covered to enable the terminal sealing structure to penetrate through the terminal outlet hole, and the section of the assembly position of the soft rubber sleeve and the terminal outlet hole in the axial direction of the terminal outlet hole is in a wedge shape, so that the hole wall of the terminal outlet hole and the outer wall of the soft rubber sleeve are matched and fixed in a wedge shape. Compared with the prior art, the terminal sealing structure is simple and convenient in installation mode and good in sealing effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor sealing, in particular to a terminal sealing structure applied to the junction of a busbar terminal and a motor housing. BACKGROUND

[0002] The busbar terminal is a core component of motor electrical connection, and its sealing performance with the end cover directly affects the waterproof and dustproof effect, running stability and service life of the motor. Therefore, a reliable sealing structure is needed to block the intrusion of external impurities into the motor interior, while avoiding the influence of assembly on the internal components of the motor.

[0003] In the prior art, the sealing of the busbar terminal and the end cover mainly adopts two structural forms: one is that the busbar terminal rubber body directly realizes sealing with the end cover terminal hole through interference fit; the other is that the motor is first assembled as a whole, and then a sealing sleeve is interference-fitted between the busbar terminal rubber body and the end cover terminal hole to achieve the sealing effect. Among them, the rubber body is formed by directly coating the rubber material on the surface of the busbar terminal through injection molding process, while the soft rubber sleeve is a pre-formed independent rubber sleeve which is sleeved on the surface of the rubber body during use and needs to be assembled additionally.

[0004] However, the above two existing structures have obvious defects: the interference assembly of the former not only increases the difficulty of motor assembly, but also the rubber debris (from the rubber body) generated during the press-fitting process is easy to flow into the motor interior, causing the motor to be stuck, and the stress generated by the interference assembly will cause the rubber body of the busbar terminal to displace and deform, and the sealing effect cannot be flexibly adjusted; the latter interference-fits the sealing sleeve after the motor is assembled as a whole, which also has the problems of difficult assembly and insufficient axial positioning accuracy, and the sealing effect is also difficult to adapt and adjust according to actual needs. The existing designs cannot meet the dual needs of efficient assembly and reliable sealing of the motor.

[0005] Therefore, it is necessary to provide a new terminal sealing structure to solve the above problems. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a terminal sealing structure which is convenient to install and has good sealing effect.

[0007] To solve the above technical problems, the present application provides a terminal sealing structure for realizing the sealed connection between a busbar terminal and a motor housing having a receiving space, the motor housing having a terminal hole passing therethrough, the busbar terminal including a body portion and an extension portion, the body portion being installed in the receiving space, the extension portion being extended from the body portion and partially exposed to the receiving space through the terminal hole, the terminal sealing structure including a rubber body and a soft rubber sleeve sleeved on the peripheral side of the rubber body. The overmolding body wraps around and covers the outer periphery of the extension. The soft rubber sleeve is elastically fitted around the outer periphery of the overmolding body and forms a circumferential covering on the overmolding body. After the overmolding body and the soft rubber sleeve are assembled first, the end cap is then closed to the outer shell body so that the terminal sealing structure passes through the terminal outlet hole. The cross-sectional shape formed by the assembly of the soft rubber sleeve and the terminal outlet hole in the axial direction of the terminal outlet hole is wedge-shaped, so that the hole wall of the terminal outlet hole and the outer wall of the soft rubber sleeve form a wedge-shaped fit and fixation.

[0008] Furthermore, the soft rubber sleeve has a stop structure at one end away from the outer shell body, the top surface of the rubber body away from the outer shell body abuts against the stop structure, and the extension passes through the top surface of the rubber body and the inner peripheral side of the stop structure and extends outward from the soft rubber sleeve.

[0009] Furthermore, the soft rubber sleeve includes a first fixing portion and a first connecting portion extending from the first fixing portion. The first fixing portion is closer to the body portion than the first connecting portion. The radius of the first fixing portion gradually increases from its transition position with the first connecting portion toward the body portion. The outer surface of the first fixing part abuts against the wall of the outlet terminal hole to form a wedge-shaped fit for fixing.

[0010] Furthermore, the stop structure is formed by bending and extending the end of the first connecting portion away from the outer shell body towards the extension portion.

[0011] Furthermore, the encapsulated body includes a second fixing part and a second connecting part extending from the second fixing part. The second connecting part is received and fixed inside the first connecting part. The cross-sectional shape of the second fixing part in the axial direction through the outlet terminal hole is wedge-shaped. The outer wall of the second fixing part and the inner wall of the first fixing part form a wedge-shaped fit for fixation.

[0012] Furthermore, the soft rubber sleeve also includes a wedge-shaped limiting groove recessed on the side of the stop structure near the rubber body, and the rubber body also includes a limiting structure formed by the top surface of the second connecting portion protruding and covering the extension portion. After the rubber body and the soft rubber sleeve are assembled, the wedge-shaped limiting groove and the limiting structure form a wedge-shaped fit.

[0013] Furthermore, the soft rubber sleeve also includes a lug structure formed by the outer peripheral side of the first connecting portion protruding radially outward along the extension portion, the lug structure being exposed in the receiving space after the soft rubber sleeve and the end cap are assembled.

[0014] Furthermore, the bus terminal includes multiple terminals, each of which is wrapped by a separate encapsulating body and assembled with a separate soft rubber sleeve. The different soft rubber sleeves are interconnected by crossbeams. After the end cap is assembled with the outer shell body, the crossbeams are housed within the receiving space.

[0015] Furthermore, the outer casing body is recessed on the side near the end cap in a direction away from the end cap to form a mounting groove, and the end cap is protruded on the side near the outer casing body in a direction close to the outer casing body to form a mounting structure. When the end cap is placed on the outer casing body, the mounting structure abuts against the mounting groove.

[0016] Compared with related technologies, the terminal sealing structure of the present invention is used to achieve a sealed connection between a bus terminal and a motor housing with a receiving space. The motor housing has a terminal outlet hole that passes through it. The bus terminal includes a body and an extension. The body is installed in the receiving space, and the extension extends from the body and passes through the terminal outlet hole, partially exposed in the receiving space. The terminal sealing structure includes an overmolded body and a soft rubber sleeve fitted on the outer periphery of the overmolded body. The overmolded body wraps around and covers the outer periphery of the extension. The soft rubber sleeve is elastically fitted on the outer periphery of the overmolded body and forms a circumferential covering on the overmolded body. After the overmolded body and the soft rubber sleeve are assembled first, the end cap is then closed to the outer housing body so that the terminal sealing structure passes through the terminal outlet hole. The cross-sectional shape formed by the assembly of the soft rubber sleeve and the terminal outlet hole in the axial direction of the terminal outlet hole is wedge-shaped, so that the hole wall of the terminal outlet hole and the outer wall of the soft rubber sleeve form a wedge-shaped fit and fixation. Compared with related technologies, this application separates the assembly process of the overmolding body, the soft rubber sleeve, and the terminal hole. When the end cap is closed with the outer shell, the axial assembly relationship of the three is transformed into a radial tightness relationship formed by the wedge structure. This simplifies the installation method and improves the sealing effect. At the same time, the size of the terminal hole of the wedge structure can be freely adjusted by machining without changing the mold size of the overmolding body and the soft rubber sleeve, so as to achieve a better sealing effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a three-dimensional structural diagram of the terminal sealing structure of the present invention; Figure 2 This is a partially exploded structural diagram of the terminal sealing structure of the present invention; Figure 3 For along Figure 1 Sectional view of line AA in the middle; Figure 4 for Figure 3 A magnified view of part B in the image. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-4 As shown, this embodiment of the invention provides a terminal sealing structure 1, which is used to achieve a sealed connection between a bus terminal 3 and a motor housing 2 with a receiving space. In this embodiment, the terminal sealing structure 1, the bus terminal 3, and the motor housing 2 are all described in the form of components of a motor 100. The motor housing 2 includes a housing body 21 and an end cap 22 that forms the receiving space together with the housing body 21. The end cap 22 has a terminal outlet hole 221 that passes through it. The bus terminal 3 includes a body part 31 and an extension part 32. The body part 31 is installed in the receiving space, and the extension part 32 extends from the body part 31 and passes through the terminal outlet hole 221, partially exposed in the receiving space. The terminal sealing structure 1 includes an encapsulated body 11 and a soft rubber sleeve 12 sleeved on the outer periphery of the encapsulated body 11. The encapsulated body 11 wraps around and covers the outer periphery of the extension 32. The soft rubber sleeve 12 is elastically fitted around the outer periphery of the encapsulated body 11 and forms a circumferential covering of the encapsulated body 11. After the encapsulated body 11 and the soft rubber sleeve 12 are assembled first, the end cap 22 is then covered with the outer shell body 21 so that the terminal sealing structure 1 passes through the terminal outlet hole 221. The cross-sectional shape formed by the assembly of the soft rubber sleeve 12 and the terminal outlet hole 221 in the axial direction of the terminal outlet hole 221 is wedge-shaped, so that the hole wall of the terminal outlet hole 221 and the outer wall of the soft rubber sleeve 12 form a wedge-shaped fit and fixation.

[0020] In this embodiment of the invention, the assembly of the rubber coating 11, the soft rubber sleeve 12, and the motor housing 2 has a specific order. After the rubber coating 11 covers the busbar terminal 3, the rubber coating 11 and the soft rubber sleeve 12 are first assembled. Then, the terminal sealing structure 1, formed by the combination of the rubber coating 11 and the soft rubber sleeve 12, is installed as a whole into the terminal outlet hole 221 of the motor housing 2. The terminal sealing structure 1 is fixed to the terminal outlet hole 221 through a wedge-shaped structure, avoiding the debris problem caused by interference fit installation and ensuring that the operation of the motor 100 is not affected by the sealing installation.

[0021] Furthermore, combined Figure 3 As shown in the embodiment of the present invention, the soft rubber sleeve 12 has a stop structure 121 at one end away from the outer shell body 21, the rubber body 11 abuts against the stop structure 121 at one end away from the outer shell body 21, and the extension 32 passes through the top surface of the rubber body 11 and the inner peripheral side of the stop structure 121 and extends outward from the soft rubber sleeve 12.

[0022] During implementation, the overmolded body 11 is elastically fitted and fixed by the soft rubber sleeve 12. This embodiment of the invention, by providing a stop structure 121, can prevent displacement of the relative positions between the soft rubber sleeve 12, the overmolded body 11, and the bus terminal 3 during assembly. Simultaneously, the annular stop structure 121 formed on the end side of the soft rubber sleeve 12 simplifies the manufacturing process of the soft rubber sleeve 12 while achieving axial positioning.

[0023] Furthermore, the soft rubber sleeve 12 includes a first fixing part 122 and a first connecting part 123 extending from the first fixing part 122. The first fixing part 122 is closer to the body part 31 than the first connecting part 123. The radius of the first fixing part 122 gradually increases from the position where it transitions with the first connecting part 123 toward the body part 31. The outer surface of the first fixing part 122 abuts against the hole wall of the outlet terminal hole 221 to form a wedge-shaped fit for fixing.

[0024] During implementation, the outer diameter of the first connecting part 123 can be designed to be the same as or slightly larger than the diameter of the terminal hole 221 located on the outer surface of the end cover 22, thereby ensuring the sealing effect of the first connecting part 123 and the terminal hole 221 on the outside of the motor housing 2; and since the first fixing part 122 and the terminal hole 221 form a wedge-shaped fit for fixing, such as Figure 4 As shown, the outer diameter of the end of the first fixing part 122 near the body part 31 can be designed to be larger than the diameter of the outlet terminal hole 221 located on the inner surface of the end cover 22, so as to ensure the sealing effect of the first fixing part 122 and the outlet terminal hole 221 inside the motor housing 2. Meanwhile, the wedge angle of the terminal hole 221 is conducive to the adjustment of subsequent processing. Since the soft rubber sleeve 12 and the terminal hole 221 are fixed by wedge shape, the sealing effect can be adjusted by processing the motor housing 2 without changing the soft rubber sleeve 12 and the membrane of the coating body 11.

[0025] Furthermore, such as Figure 3 As shown, the stop structure 121 is formed by bending and extending the first connecting portion 123 away from the outer shell body 21 towards the extension portion.

[0026] The encapsulated body 11 includes a second fixing part 111 and a second connecting part 112 extending from the second fixing part 111. The second connecting part 112 is received and fixed inside the first connecting part 123. The cross-sectional shape of the second fixing part 111 in the axial direction through the outlet terminal hole 221 is wedge-shaped. The outer wall of the second fixing part 111 and the inner wall of the first fixing part 122 form a wedge-shaped fit and fix.

[0027] Through the above design, when the rubber body 11 is first assembled with the soft rubber sleeve 12, the second connecting part 112 and the stop structure 121 achieve axial assembly limitation. When the rubber body 11, the soft rubber sleeve 12 and the terminal hole 221 are assembled as a whole, the wedge-shaped fit between the external soft rubber sleeve 12 and the terminal hole 221 causes a certain deformation, so that the second fixing part 111 of the rubber body 11 also fits tightly with the first fixing part 122 of the soft rubber sleeve 12, thereby optimizing the sealing effect.

[0028] Please refer to Figure 4 The soft rubber sleeve 12 also includes a wedge-shaped limiting groove 1211 recessed on the side of the stop structure 121 near the rubber body 11. The rubber body also includes a limiting structure 1121 formed by the top surface of its second connecting portion 112 protruding and covering the extension portion 32. After the rubber body 11 and the soft rubber sleeve 12 are assembled, the wedge-shaped limiting groove 1211 and the limiting structure 111 form a wedge-shaped fit.

[0029] Preferably, the soft rubber sleeve 12 further includes a lug structure 1231 formed by the outer peripheral side of the first connecting portion 123 protruding radially outward along the extension portion 32. The lug structure 1231 is exposed in the receiving space after the soft rubber sleeve 12 and the end cap 11 are assembled. The lug structure 1231 provides a certain limiting effect between the assembled soft rubber sleeve 12 and the end cap 22, which helps to maintain assembly stability.

[0030] like Figure 2 and Figure 4As shown, the busbar terminal 1 includes multiple terminals, each of which is wrapped by a separate encapsulating body 11 and assembled with a separate soft rubber sleeve 12. The different soft rubber sleeves 11 are interconnected by a crossbeam 13. After the end cap 222 is assembled with the outer shell body 21, the crossbeam 13 is housed within the receiving space. In practice, the crossbeam 13 and the multiple soft rubber sleeves 12 can be integrally formed, reducing manufacturing steps.

[0031] Furthermore, the outer casing 21 has a recessed mounting groove 211 on the side near the end cover 22, moving away from the end cover 22. The end cover 22 has a protruding mounting structure 222 on the side near the outer casing 21, moving closer to the outer casing 21. When the end cover 22 is placed on the outer casing 21, the mounting structure 222 abuts against the mounting groove 211. The separate motor housing 2 design facilitates the sealed installation of the busbar terminals 3, and the raised stepped mounting structure allows for convenient installation between the outer casing 21 and the end cover 22.

[0032] Compared with related technologies, the terminal sealing structure of the present invention is used to achieve a sealed connection between a bus terminal and a motor housing with a receiving space. The motor housing has a terminal outlet hole that passes through it. The bus terminal includes a body and an extension. The body is installed in the receiving space, and the extension extends from the body and passes through the terminal outlet hole, partially exposed in the receiving space. The terminal sealing structure includes an overmolded body and a soft rubber sleeve fitted on the outer periphery of the overmolded body. The overmolded body wraps around and covers the outer periphery of the extension. The soft rubber sleeve is elastically fitted on the outer periphery of the overmolded body and forms a circumferential covering on the overmolded body. After the overmolded body and the soft rubber sleeve are assembled first, the end cap is then closed to the outer housing body so that the terminal sealing structure passes through the terminal outlet hole. The cross-sectional shape formed by the assembly of the soft rubber sleeve and the terminal outlet hole in the axial direction of the terminal outlet hole is wedge-shaped, so that the hole wall of the terminal outlet hole and the outer wall of the soft rubber sleeve form a wedge-shaped fit and fixation. Compared with related technologies, this application separates the assembly process of the overmolding body, the soft rubber sleeve, and the terminal hole. When the end cap is closed with the outer shell, the axial assembly relationship of the three is transformed into a radial tightness relationship formed by the wedge structure. This simplifies the installation method and improves the sealing effect. At the same time, the size of the terminal hole of the wedge structure can be freely adjusted by machining without changing the mold size of the overmolding body and the soft rubber sleeve, so as to achieve a better sealing effect.

Claims

1. A terminal sealing structure, wherein the terminal sealing structure is used to achieve a sealed connection between a bus terminal and a motor housing having a receiving space, the motor housing including a housing body and an end cap forming the receiving space together with the housing body, the end cap having a terminal outlet hole therethrough, the bus terminal including a body portion and an extension portion, the body portion being installed within the receiving space, the extension portion extending from the body portion and partially exposed through the terminal outlet hole into the receiving space, the terminal sealing structure including an overlay body and a soft rubber sleeve fitted around the periphery of the overlay body; characterized in that, The overmolding body wraps around and covers the outer periphery of the extension. The soft rubber sleeve is elastically fitted around the outer periphery of the overmolding body and forms a circumferential covering on the overmolding body. After the overmolding body and the soft rubber sleeve are assembled first, the end cap is then closed to the outer shell body so that the terminal sealing structure passes through the terminal outlet hole. The cross-sectional shape of the soft rubber sleeve and the terminal outlet hole in the axial direction of the terminal outlet hole is wedge-shaped, so that the hole wall of the terminal outlet hole and the outer wall of the soft rubber sleeve form a wedge-shaped fit and fixation.

2. The terminal sealing structure according to claim 1, characterized in that, The soft rubber sleeve has a stop structure at one end away from the outer shell body. The top surface of the rubber body away from the outer shell body abuts against the stop structure. The extension passes through the top surface of the rubber body and the inner peripheral side of the stop structure and extends outward from the soft rubber sleeve.

3. The terminal sealing structure according to claim 2, characterized in that, The soft rubber sleeve includes a first fixing part and a first connecting part extending from the first fixing part. The first fixing part is closer to the body part than the first connecting part. The radius of the first fixing part gradually increases from the position where it transitions with the first connecting part toward the body part. The outer surface of the first fixing part abuts against the wall of the outlet terminal hole to form a wedge-shaped fit for fixing.

4. The terminal sealing structure according to claim 3, characterized in that, The stop structure is formed by bending and extending the first connecting portion away from the outer shell body towards the extension portion.

5. The terminal sealing structure according to claim 3, characterized in that, The encapsulated body includes a second fixing part and a second connecting part extending from the second fixing part. The second connecting part is received and fixed inside the first connecting part. The cross-sectional shape of the second fixing part in the axial direction through the outlet terminal hole is wedge-shaped. The outer wall of the second fixing part and the inner wall of the first fixing part form a wedge-shaped fit for fixation.

6. The terminal sealing structure according to claim 5, characterized in that, The soft rubber sleeve also includes a wedge-shaped limiting groove recessed on the side of the stop structure near the rubber body. The rubber body also includes a limiting structure formed by the top surface of the second connecting portion protruding and covering the extension portion. After the rubber body and the soft rubber sleeve are assembled, the wedge-shaped limiting groove and the limiting structure form a wedge-shaped fit.

7. The terminal sealing structure according to claim 3, characterized in that, The soft rubber sleeve also includes a lug structure formed by the outer peripheral side of the first connecting portion protruding radially outward along the extension portion, the lug structure being exposed in the receiving space after the soft rubber sleeve and the end cap are assembled.

8. The terminal sealing structure according to claim 1, characterized in that, The busbar terminals include multiple terminals, each of which is wrapped by a separate encapsulating body and assembled with a separate soft rubber sleeve. The different soft rubber sleeves are connected to each other by crossbeams. After the end cap is assembled with the outer shell body, the crossbeams are housed in the receiving space.

9. The terminal sealing structure according to claim 1, characterized in that, The outer casing body is recessed on the side near the end cap to form a mounting groove in the direction away from the end cap, and the end cap is protruded on the side near the outer casing body to form a mounting structure. When the end cap is placed on the outer casing body, the mounting structure abuts against the mounting groove.

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