Angled connector and its assembly process

Abstract

The invention relates to an angled connector and an assembly method.The angled connector comprises a housing including a first receiving cavity and a second receiving cavity inclined relative to the first receiving cavity, at the intersection of which a mounting area is formed; a rubber core assembly including a cable and a wiring terminal in the first receiving cavity including a wiring portion connected to the cable and a first fixing portion extending into the mounting area; a receiving terminal in the second receiving cavity, including a contact portion configured to connect to a power outlet terminal and a second fixing portion extending into the mounting area and overlapping the first fixing portion; and a fixing assembly in the mounting area, including a limiting element and a locking element between which the second fixing portion and the first fixing portion are clamped.(Figure to be published for the summary: Figure 1).

Description

Title of the invention: Elbow connector and its assembly method Technical field

[0001] The present invention relates to the technical field of connectors, in particular an angled connector and its assembly method. CONTEXT

[0002] An electronic connector plays a vital role in the electrical connection between wires and can ensure stable transmission of electrical signals. In order to meet installation requirements, angled connectors are commonly used on the market. Elbow connectors are generally used to solve the problem of angle changes between wires, making connections more flexible and convenient. Although useful in many applications, angled connectors are not easy to manufacture, which explains their relatively high price.

[0003] The elbow connectors currently used by most electric vehicles (EVs) on the market have more complex problems. First, since an elbow connector has an elbow-shaped plug-in part, its terminal structure is relatively complex and requires a complex molding and assembly process for manufacturing, which increases the manufacturing difficulty and cost.

[0004] In addition, the structure and manufacturing process of an elbow connector are relatively complex, which increases the assembly difficulty, production cycle and scrap rate, and results in an increase in overall manufacturing costs. SUMMARY

[0005] In order to solve the problems related to the complexity of structures, manufacturing processes and high manufacturing costs of sockets in elbow connectors, the present invention provides an elbow connector and an assembly method thereof.

[0006] The technical diagrams of the present invention are as follows.

[0007] In a first aspect of the present invention, an embodiment provides an angled connector, comprising: a housing, comprising a first receiving cavity and a second receiving cavity, the first receiving cavity and the second receiving cavity being inclined, and a mounting area being formed at an intersection of the first receiving cavity and the second receiving cavity; a rubber core assembly, comprising a cable and a wiring terminal disposed in the first receiving cavity, the wiring terminal comprising a wiring portion and a first fastening portion, the wiring portion being connected to the cable, and the first fastening portion extending into the mounting area; a terminal a docking terminal disposed in the second receiving cavity and comprising a contact portion configured to connect to a socket terminal and a second fastening portion extending into the mounting area and overlapping the first fastening portion; and a fastening assembly, disposed in the mounting area and comprising a limiting member and a locking member, the second fastening portion and the first fastening portion being clamped between the limiting member and the locking member.

[0008] Compared with the related art, the beneficial effects of the present invention are as follows.

[0009] 1. Through the mounting area, the first fixing part of the wiring terminal and the second fixing part of the docking terminal can extend into the mounting area from two directions of the elbow connector and overlap to realize electrical communication between the wiring terminal and the docking terminal which are at an angle in the elbow connector, and a connection structure as well as a simple manufacturing process.

[0010] 2. The first fixing part and the second fixing part can be fixed together through the limiting member and the locking member, so as to fix the wiring terminal and the mooring terminal. The fixing structure and manufacturing process are simple, which can reduce manufacturing costs. BRIEF DESCRIPTION OF THE FIGURES

[0011] In order to more clearly illustrate the technical diagrams of the embodiments of the present invention, the accompanying drawings necessary for describing the embodiments or related art will be briefly described below.

[0012] [Fig.l] is a schematic structural view of the present invention;

[0013] [Fig.2] is an exploded view of the present invention;

[0014] [Fig.3] is a cross-sectional view along AA in [Fig.l];

[0015] [Fig.4] is a cross-sectional view along BB in [Fig.l];

[0016] [Fig.5] is a cross-sectional view along CC in [Fig.l];

[0017] [Fig.6] is a cross-sectional view along DD in [Fig.l];

[0018] [Fig.7] is a schematic structural view of a housing within the framework of the present invention;

[0019] [Fig.8] is a schematic structural view of the housing of the present invention from another perspective;

[0020] [Fig.9] is a cross-sectional view along EE in [Fig.7];

[0021] [Fig. 10] is a cross-sectional view along FF in [Fig.7];

[0022] [Fig. 11] is a schematic structural view of a sealing cover in the within the framework of this disclosure;

[0023] [Fig. 12] is a schematic structural view of a docking station within the scope of the present disclosure;

[0024] [Fig. 13] is a schematic structural view of a front cover within the scope of the present disclosure; and

[0025] [Fig. 14] is a schematic structural view of a rear cover within the scope of the present disclosure. DETAILED DESCRIPTION

[0026] In order to make clearer the technical problems, technical schemes and beneficial effects to be solved by the present invention, the present invention is described in more detail below in connection with the accompanying drawings and embodiments. It should be noted that similar symbols and letters designate similar elements in the following accompanying drawings, so that once an element is defined in an accompanying drawing, it is no longer necessary to define and explain it in the following accompanying drawings. It is also stated that the embodiments described below are used only to explain the present invention and are not intended to limit it.

[0027] Referring to FIGS. 1-10, one embodiment provides an angled connector, comprising a housing 1, a rubber core assembly 2, at least one docking terminal 3, and a fixing assembly. The housing 1 has a first receiving cavity 11 and a second receiving cavity 12. The first receiving cavity 11 and the second receiving cavity 12 form an angle, and a mounting area 13 is formed at the intersection of the first receiving cavity 11 and the second receiving cavity 12. The rubber core assembly 2 comprises at least one cable 21 and at least one wiring terminal 22 which is disposed in the first receiving cavity 11. The wiring terminal 22 comprises a wiring portion 221 and a first fixing portion 222. The wiring portion 221 is connected to the cable 21, and the first fixing portion 222 extends into the mounting area 13.The receiving terminal 3 is arranged in the second receiving cavity 12 and comprises a contact portion configured to fit a socket terminal and a second fastening portion 313 which extends into the mounting area 13 and at least partially overlaps the first fastening portion 222. The fastening assembly is arranged in the mounting area 13 and comprises a limiting element 4 and a locking element 5. The second fastening portion 313 and the first fastening portion 222 are clamped between . the limiting member 4 and the locking member 5. In the present invention, the mounting area 13 is arranged such that the first fixing portion 222 of the wiring terminal 22 and the second fixing portion 313 of the docking terminal 3 can extend into the mounting area 13 from two directions of the elbow connector and overlap at least partially to make an electrical connection between the wiring terminal 22 and the docking terminal 3 which are at an angle in the elbow connector. The first fixing portion 222 and the second fixing portion 313 can be fixed together via the limiting member 4 and the locking member 5, thereby fixing the wiring terminal 22 and the docking terminal 3 in the elbow connector.

[0028] With reference to FIGS. 2 to 10, in one embodiment, the housing 1 comprises a mounting hole 14 disposed in a direction perpendicular to the first receiving cavity 11 and the second receiving cavity 12, and the mounting hole 14 extends to the mounting area 13. The first fixing portion 222 and the second fixing portion 313 overlap in an axial direction of the mounting hole 14. The first fixing portion 222 comprises a first through hole 2221 disposed in the axial direction of the mounting hole 14. The second fixing portion 313 comprises a second through hole 3131 disposed in the axial direction of the mounting hole 14. The first through hole 2221 and the second through hole 3131 completely overlap in the axial direction of the mounting hole 14. One end of the locking member 5 passes through the first through hole 2221 and the second through hole 3131.The locking member 5 comprises a base 51 and a connecting rod 52 projecting inwardly from the base 51. The rod 52 passes through the first through hole 2221 and the second through hole 3131 and is then connected to the limiting member 4 to clamp the second fixing part 313 and the first fixing part 222 between the base 51 and the limiting member 4, thereby firmly fixing the first fixing part 222 and the second fixing part 313 together. The elbow connector has a simple fixing structure and is easy to use. Furthermore, the mounting hole 14 is covered with a sealing cover 6 to seal the mounting hole 14 after the locking member 5 locks the second fixing part 313 and the first fixing part 222, so as to realize sealing when the elbow connector is ready for use, and a good sealing effect is achieved without a complicated glue filling process.

[0029] Referring to FIGS. 2, 5 and 9 to 11, the sealing cover 6 comprises a cover plate 61, an annular first connecting portion 62 projecting inwardly from the cover plate 61, and a plurality of elastic arms 63 projecting inwardly from the first connecting portion 62. Each of the elastic arms 63 is provided with a loop 64 at its end. The first connecting portion connection 62 is concave to form a first sealing ring groove 621. The mounting hole 14 includes a first receiving hole 141 and a second receiving hole 142. The second receiving hole 142 communicates with the first receiving hole 141 and the mounting area 13. A mounting step 143 is formed between the first receiving hole 141 and the second receiving hole 142. The cover plate 61 is received in the first receiving hole 141 and abuts against the mounting step 143. A first sealing ring 622 is disposed between the first sealing ring groove 621 and the second receiving hole 142. The second receiving hole 142 includes a first hole section 1421 near the first receiving hole 141 and a second hole section 1422 near the mounting area 13. The second hole section 1422 has an opening that narrows from the first receiving hole 141 toward the mounting area 13.A first resisting part 144 is formed by an end surface of the second hole section 1422. The buckle 64 passes through the second receiving hole 142 and is then snapped into the first resisting part 144. A first sealing ring 622 is disposed between the first sealing ring groove 621 and the first hole section 1421, so as to seal between the mounting hole 14 and the mounting area 13. With respect to the adjustment of the sealing cover 6 and the mounting hole 14, by gradually reducing the opening of the second hole section 1422 from the outside to the inside, the first resisting part 144 and the buckle 64 have a larger matching area and the two are engaged more strongly. It is also easier for the plurality of elastic arms 63 to enter the mounting area 13 from the second receiving hole 142 to engage the first resisting portion 144.The plurality of elastic arms 63 and the loop 64 at the end of each of the elastic arms 63 are arranged such that when the sealing cover 6 is assembled in the second receiving hole 142, the loop 64 is compressed by a side wall of the second receiving hole 142 and closes with the elastic arms 63, so as to smoothly pass through the second receiving hole 142.

[0030] In one embodiment, the limiting member 4 is a hexagonal nut, and the locking member 5 is a bolt that passes through the first through hole 2221 and the second through hole 3131 to be screwed into the nut. The bolt can be easily screwed into the nut using a screwdriver, so as to firmly fix the first fixing part 222 and the second fixing part 313 together.

[0031] Referring to FIGS. 4 and 7 to 10, in one embodiment, a plurality of first limiting convex ribs 121 are disposed in the second receiving cavity 12. The mooring terminal 3 is clamped between a pair of oppositely disposed first limiting convex ribs 121, one end of each of the first limiting convex ribs 121 extending to the mounting area 13. The second fixing portion 313 and the first fixing portion 222 are clamped between the limiting member 4 and the first limiting convex ribs 121, so that the first fixing portion 222 and the second fixing portion 313 can remain superimposed after the wiring terminal block 22 and the receiving terminal block 3 have been assembled in the housing 1. Several second limiting convex ribs 111 are arranged in the first receiving cavity 11.The wiring terminal 22 is clamped between a pair of oppositely arranged second convex limiting ribs 111, and the second convex limiting ribs 111 extend to the mounting area 13 and abut against the second fixing portion 313, so that the second fixing portion 313 is limited in the mounting area 13 after the docking terminal 3 is assembled in the housing 1.

[0032] Referring to FIGS. 3, 4 and 12, in one embodiment, the receiving terminal 3 is a high-current clamping terminal, which comprises a first clamping piece 31, a second clamping piece 32 opposite the first clamping piece 31, and a second connection portion 33 between the first clamping piece 31 and the second clamping piece 32. The first clamping piece 31 comprises a first main part 311. A first clamp terminal 312 extends from one end of the first main body part 311. The second fixing part 313 is provided at the other end of the first main body part 311. The second clamping piece 32 comprises a second main body part 321. The second main body part 321 and the first main body part 311 are arranged side by side in the direction of their plate surfaces.The second main body part 321 is connected to the first main body part 311 by the second connecting part 33. A second clamping terminal 322 extends from one end of the second main body part 321. The first clamping terminal 312 and the second clamping terminal 322 form the contact part. The first clamping terminal 312 and the second clamping terminal 322 are configured to jointly clamp an end part of the socket terminal. The first fixing part 222 of the wiring terminal 22 is disposed between the first clamping piece 31 and the second clamping piece 32. The space between the first clamping piece 31 and the second clamping piece 32 is fully utilized to place the first fixing part 222, so as to reduce the design space of the elbow connector in the axial direction of the mounting hole 14.

[0033] Referring to FIGS. 4 and 8 to 10, the mounting area 13 further comprises a limiting groove 131 configured to install the limiting member 4. The shape of the limiting groove 131 matches that of the limiting member 4 in order to prevent rotation of the limiting member 4 when the locking member 5 is connected to the limiting element 4. The limiting groove 131 communicates with the second receiving cavity 12. The second part of the main body 321 has a second resistant part 3211 opposite the limiting groove 131 and against the limiting element 4. The second resistant part 3211 corresponds to a shape of the limiting element 4. The second resistant part 3211, associated with the limiting groove 131, limits the limiting element 4 inside the mounting area 13.

[0034] Referring to FIGS. 1, 2, 6 and 13, in one embodiment, the elbow connector further comprises a front cover 7 and a second sealing ring 8. The housing 1 has a first plug-in cavity 15 for receiving a second plug-in portion of the socket terminal, and a second plug-in cavity is formed in the second plug-in portion of the socket terminal. The first plug-in cavity 15 comprises a first plug-in portion 16 which is plugged into the second plug-in cavity of the socket terminal. A signal terminal receiving cavity 17 is provided in the first plug-in portion 16. A signal terminal holder 18 configured to receive a signal terminal is disposed in the signal terminal receiving cavity 17. The signal terminal receiving cavity 17 is adjacent to the second receiving cavity 12.The front cover 7 is placed on a port of the first plug-in part 16 and covers a port of the second receiving cavity 12 and a port of the receiving cavity of the signal terminal 17. The first plug-in part 16 comprises a second sealing groove 161. One end of the second sealing ring 8 is inserted into the second sealing groove 161, and the other end of the second sealing ring 8 is leaned against a side wall of the front cover 7, so as to fix the second sealing ring 8. When the first plug-in part 16 is plugged into the second plug-in cavity of the socket terminal, the second sealing ring 8 is clamped between the second plug-in cavity and the first plug-in part 16 to achieve a sealed connection between the two.

[0035] More specifically, a pair of first fixing arms 71 are provided on opposite sides of the front cover 7. The first plug-in portion 16 includes a pair of fixing grooves 162 corresponding to the pair of first fixing arms 71. The front cover 7 includes a signal terminal hole 72 corresponding to the signal terminal receiving cavity 17 and two opposing cantilever arms 73 extending from the signal terminal hole 72 toward the signal terminal receiving cavity 17. The two cantilever arms 73 rest on the signal terminal holder 18 to limit the signal terminal holder 18 in the signal terminal receiving cavity 17. One end of each of the two cantilever arms 73 connected to the front cover 7 includes a reinforcing convex rib 74, in order to strengthen the strength of each of the two cantilever arms 73 and prevent them from being easily deformed. In addition, the widths of the two cantilever arms 73 are different, so that an assembler can identify a correct assembly direction of the front cover 7 based on the different widths of the two cantilever arms 73, in order to avoid reverse assembly.

[0036] Referring to FIGS. 1 to 3, 6 and 14, in one embodiment, the elbow connector further comprises a rear cover 9 and a third sealing ring 10. The housing 1 has a third plug-in portion 19. The third plug-in portion 19 and the first plug-in portion 16 form an angle. The first receiving cavity 11 is formed in the third plug-in portion 19. The rear cover 9 covers the first receiving cavity 11, and the third plug-in portion 19 is sleeved outwardly with a side wall of the rear cover 9. A safety notch 91 is formed in the side wall of the rear cover 9, and the third plug-in portion 19 comprises a safety boss 191 which corresponds to the safety notch 91, in order to prevent the rear cover 9 from being mounted upside down.The third sealing ring 10 is arranged in the first receiving cavity 11 and comprises a wire hole 101 for the cable 21 to pass through, so that the cable 21 can be smoothly assembled into the housing 1 and the first receiving cavity 11 can also be sealed.

[0037] A method of assembling the above elbow connector comprises the following steps.

[0038] 1) a limiting element 4 is installed in a limiting groove 131 from of a second receiving cavity 12.

[0039] 2) a pre-installed rubber core assembly 2 with a third ring sealing member 10 and a docking terminal 3 is installed on a mounting area 13 respectively from a first receiving cavity 11 and a second receiving cavity 12, so that a first fixing portion 222 of a wiring terminal 22 and a second fixing portion 313 of the docking terminal 3 at least partially overlap and are clamped between a pair of first limiting convex ribs 121 and the limiting member 4.

[0040] 3) a locking element 5 is installed on the mounting area 13 from of a mounting hole 14, and passes through a first through hole 2221 of the first fixing part 222 and a second through hole 3131 of the second fixing part 313 to be screwed with the limiting member 4, so that the first fixing part 222 and the second fixing part 313 can be fixed together.

[0041] 4) the mounting hole 14 is covered by a pre-installed sealing cover 6 with a first seal 622 to complete the seal between the mounting area 13 and the mounting hole 14.

[0042] 5) the third sealing ring 10 is installed in the first receiving cavity 11, then an orifice of the first receiving cavity is covered by a rear cover 9 to complete the sealing of the first receiving cavity.

[0043] 6) a second sealing ring 8 is installed on a second groove sealing ring 161, then a front cover 7 covers the second receiving cavity 12 and rests against the second sealing ring 8, so as to complete the assembly of the angled connector.

[0044] In summary, in the elbow connector provided in the present invention, the mounting area 13 is arranged such that the first fixing portion 222 of the wiring terminal 22 and the second fixing portion 313 of the docking terminal 3 can extend into the mounting area 13 from two directions of the elbow connector and overlap at least partially to realize the electrical communication between the wiring terminal 22 and the docking terminal 3 which are at an angle to each other in the elbow connector. The connection structure and manufacturing process of the elbow connector are simple. The first fixing portion 222 and the second fixing portion 313 can be fixed together via the limiting member 4 and the locking member 5, so as to fix the wiring terminal 22 and the docking terminal 3.The fixing structure and manufacturing process are simple, which reduces manufacturing costs. The sealing cover 6, the third sealing ring 10 and the second sealing ring 8 are respectively arranged in the mounting hole 14, the first receiving cavity 11 and the first plug-in part 16, so that the sealing of the elbow connector can be realized by sealing structural members when the elbow connector is ready for use, without a complicated process of filling glue for sealing. The manufacturing process is simple and the material costs for manufacturing are low, which reduces production costs.

[0045] It is understood that those of ordinary skill in the art may make improvements or modifications based on the above description, and that all such improvements and modifications shall fall within the scope of the appended claims of this disclosure.

Claims

Claims

1. An angled connector, comprising: a. a housing comprising a first receiving cavity and a second receiving cavity, the first receiving cavity and the second receiving cavity forming an angle, and a mounting area formed at the intersection of the first receiving cavity and the second receiving cavity; b. a rubber core assembly, comprising a cable and a wiring terminal disposed in the first receiving cavity, the wiring terminal comprising a wiring portion connected to the cable and a first attachment portion extending into the mounting area; c. a docking terminal disposed in the second receiving cavity, comprising a contact portion configured to connect to a socket terminal and a second attachment portion extending into the mounting area and at least partially overlapping the first attachment portion; and d. a fastening assembly disposed in the mounting area, comprising a limiting element and a locking element, the second fastening part and the first fastening part being clamped between the limiting element and the locking element.

2. The elbow connector according to claim 1, wherein the housing comprises a mounting hole arranged in a direction perpendicular to the first receiving cavity and the second receiving cavity, the mounting hole extends to the mounting area, the mounting hole is covered with a sealing cover, the first fixing portion and the second fixing portion at least partially overlap in an axial direction of the mounting hole, the first fixing portion comprises a first through hole in the axial direction of the mounting hole, the second fixing portion comprises a second through hole in the axial direction of the mounting hole, the first through hole and the second through hole completely overlap in the axial direction of the mounting hole, and a end of the locking member passes through the first through hole and the second through hole and is then connected to the limiting member.

3. The elbow connector according to claim 2, wherein the locking member comprises a base and a connecting rod protruding toward the inside of the base, the connecting rod passes through the first through hole and the second through hole to connect to the limiting member, and the second fixing portion and the first fixing portion are clamped between the base and the limiting member.

4. The elbow connector according to claim 2, wherein the sealing cover comprises a cover plate, a first annular connection part protruding inwardly from the cover plate, and a plurality of elastic arms protruding inwardly from the first connection part, each of the plurality of elastic arms being provided with a loop at one end of the plurality of elastic arms, and the first connection part being concave to form a first sealing ring groove; and a.wherein the mounting hole comprises a first receiving hole and a second receiving hole, communicating with the first receiving hole and the mounting area, a mounting step is formed between the first receiving hole and the second receiving hole, the cover plate is received in the first receiving hole and abuts against the mounting step, a first sealing ring is disposed between the first groove of the sealing ring and the second receiving hole, a first resisting portion is formed by an end surface of the second receiving hole, and the buckle passes through the second receiving hole to snap into the first resisting portion; b.wherein the second receiving hole comprises a first hole section proximate the first receiving hole and a second hole section proximate the mounting area, the second hole section comprises an opening tapering from the first hole section. toward the mounting area, the first resisting portion is formed by an end surface of the second hole section, and the first sealing ring is disposed between the first sealing ring groove and the first hole section.

5. The elbow connector according to claim 1, wherein a plurality of first limiting convex ribs are disposed in the second receiving cavity such that the receiving terminal is clamped between a pair of the plurality of first limiting convex ribs, one end of each of the plurality of first limiting convex ribs extends to the mounting area, and the second fixing portion and the first fixing portion are clamped between the limiting member and the plurality of first limiting convex ribs.

6. The elbow connector according to claim 1, wherein a plurality of second convex limiting ribs are disposed in the first receiving cavity such that the wiring terminal is clamped between a pair of second convex limiting ribs, and the plurality of second convex limiting ribs extends to the mounting area and abuts against the second fixing portion.

7. The elbow connector according to claim 1, wherein the mounting area comprises a limiting groove configured to install the limiting member, and a shape of the limiting groove corresponds to the limiting member; a. wherein the docking terminal is a high-current clamping terminal, comprising a first clamping piece, a second clamping piece opposite the first clamping piece, and a second connection portion between the first clamping piece and the second clamping piece; the first fixing portion is disposed between the first clamping piece and the second clamping piece; the first clamping piece comprises a first main body portion, a first clamp terminal extends from one end of the first main body portion, and the second fixing portion is disposed at the other end of the first main body portion; main body; the second clamping part comprises a second main body part, the second main body part and the first main body part are arranged side by side in a direction of plate surfaces of the first main body part, the second main body part is connected to the first main body part by the second connecting part, a second clamping terminal extends from one end of the second main body part, and the first clamping terminal and the second clamping terminal form the contact part; b.wherein the limiting groove communicates with the second receiving cavity, a second resisting portion is formed on the second portion of the main body, the second resisting portion is disposed opposite the limiting groove and abuts against the limiting member, the second resisting portion matches a shape of the limiting member, and the second resisting portion and the limiting groove together limit the limiting member within the mounting area.

8. The elbow connector according to claim 1, further comprising a front cover and a second sealing ring, wherein the housing comprises a first plug-in cavity for receiving a second plug-in portion of the socket terminal, the first plug-in cavity comprises a first plug-in portion plugged into a second plug-in cavity of the socket terminal, the front cover is disposed on a port of the first plug-in portion and covers a port of the second receiving cavity, the first plug-in portion comprises a second sealing groove, one end of the second sealing ring is plugged into the second sealing groove, and the other end of the second sealing ring abuts against a side wall of the front cover;further comprising a rear cover, wherein the housing comprises a third plug-in portion which is at an angle to the first plug-in portion, the first receiving cavity is formed; in the third plug-in part, the rear cover covers the first receiving cavity, and the third plug-in part is sleeved outwardly with a side wall of the rear cover.

9. The elbow connector of claim 1, further comprising a third sealing ring disposed in the first receiving cavity and comprising a hole for the passage of the cable.

10. A method of assembling the angled connector according to any one of claims 1 to 9, comprising: a. installing a limiting element in a limiting groove from a second receiving cavity; b. installing a pre-installed rubber core assembly, a third sealing ring and a docking terminal to a mounting area respectively from a first receiving cavity and the second receiving cavity, such that a first fixing portion of a wiring terminal and a second fixing portion of the docking terminal at least partially overlap each other and are clamped between a pair of first limiting convex ribs and the limiting member; c. installing a locking member on the mounting area from a mounting hole, and passing the locking member through a first through hole of the first fixing part and a second through hole of the second fixing part to screw it with the limiting member; d. installation of a mounting hole with a pre-installed sealing cover with a first sealing ring to complete the seal between the mounting area and the mounting hole; e. installing the third sealing ring in the first receiving cavity and covering an orifice of the first receiving cavity with a rear cover; and f. installing a second seal in a second sealing groove, and covering the second cavity for receiving a front cover which rests against the second sealing gasket.

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