Small-pitch board-to-board rectangular connector assembly

Abstract

The application relates to the field of connectors and discloses a small-pitch plate-to-plate rectangular connector assembly which comprises a first connector and a second connector; the first connector comprises a first plastic shell and a first conductive terminal mounted on the first plastic shell, and a protruding plug-in part is formed on the first plastic shell; the second connector comprises a second plastic shell and a second conductive terminal mounted on the second plastic shell, and a plug-in cavity is formed on the second plastic shell; a centering part is arranged on the plug-in part, and the centering part is provided with a plurality of elastic centering ends. The centering part is elastically extruded along different directions to the side cavity walls of the plug-in cavity, the plug-in part is passively centered under the mutual extrusion between the elastic centering ends and the plug-in cavity, the plug-in part and the plug-in cavity are gradually aligned in the plug-in process, the cooperation between the first conductive terminal and the second conductive terminal is prevented from having a large deviation to affect the conduction in use, and the reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of connectors, and particularly to a small-pitch board-to-board rectangular connector assembly. Background Technology

[0002] Small-pitch board-to-board rectangular connector assemblies are precision electronic components used to connect two circuit boards, enabling signal and power transmission through their mating. Their core feature is the perfect combination of high-reliability mechanical characteristics and excellent electrical performance through meticulous impedance matching, shielding design, and differential signal transmission schemes. Therefore, small-pitch board-to-board rectangular connector assemblies are widely used in communication base stations, data center servers, industrial equipment, and automotive electronics—fields with stringent requirements for signal integrity and connection durability. To meet the increasing demands for miniaturization and high-density integration in electronic products and effectively save PCB space, the term "small pitch" refers to the extremely small center-to-center distance between the conductive terminals of the connector, typically less than 1 millimeter.

[0003] Existing small-pitch board-to-board connector assemblies typically consist of complementary, mating first and second connectors. Both the first and second connectors include plastic housings and conductive terminals. Connection and mating are achieved by forming a mating cavity on the first connector and a mating portion on the second connector that inserts into the mating cavity. However, to facilitate easy mating between the mating cavity and the mating portion, a certain gap needs to be maintained between the mating portion and the mating cavity to avoid interference between the two plastic housings affecting installation. This can lead to misalignment of the conductive terminals due to misalignment after the mating portion is fitted into the mating cavity. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a small-pitch board-to-board rectangular connector assembly to solve the problem of misalignment between the terminals of the mating cavity and the mating part due to the offset.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: providing a small-pitch board-to-board rectangular connector assembly including a first connector and a second connector; the first connector includes a first plastic housing and a first conductive terminal mounted on the first plastic housing, the first plastic housing having a mating portion protruding along a mating direction; the second connector includes a second plastic housing and a second conductive terminal mounted on the second plastic housing, the second plastic housing having a mating cavity for the mating portion to move through in the mating direction; the mating portion has a centering portion, the centering portion having multiple elastic centering ends for elastically pressing the cavity walls of each side of the mating cavity in multiple directions when the mating portion is inserted into the mating cavity.

[0006] Furthermore, the centering portion includes two centering plates arranged diagonally. Each centering plate includes a base embedded in the outer wall of the insertion portion and two elastic centering ends respectively connected to both ends of the base. The two ends of the base extend to two adjacent outer walls of the insertion portion, and each elastic centering end is located on a different outer wall.

[0007] Furthermore, a fitting groove is provided at two corner positions on the outer side wall of the insertion part, which are diagonally distributed. The two sides of the fitting groove extend to the corresponding two outer side walls to have a first side groove and a second side groove. The base is fixedly installed in the fitting groove. The two elastic centering ends extend from the corresponding ends of the base along the insertion direction to the first side groove and the second side groove, respectively. The elastic centering ends have an outward arch in the middle to extend out of the fitting groove.

[0008] Furthermore, the mating cavity is provided with a guide groove at the position corresponding to each elastic mating end, so that the elastic mating end can extend into it along the insertion direction and communicate with the mating cavity inward. The groove opening of the guide groove has a wide-mouthed guide opening.

[0009] Furthermore, a shielding plate is provided in the guide groove, one end of which is located at the guide opening and has a guide slope that allows the elastic centering end to enter the guide groove inward.

[0010] Furthermore, the mating portion has an inner cavity for inserting the second conductive terminal therein along the mating direction. The first plastic housing has a first insertion cavity for inserting the first conductive terminal therein and communicating with the inner cavity. The inner cavity has a mating port that passes through the mating portion and allows the second conductive terminal to pass through. The mating port has an auxiliary part for coating the second conductive terminal with functional liquid when it passes through the mating port.

[0011] Furthermore, the auxiliary part includes a liquid storage cavity opened into the interlocking part and directly opposite the interlocking port, and a liquid outlet hole connecting the liquid storage cavity and the interlocking port. The outer wall of the liquid outlet hole protrudes inward into the interlocking port and forms a first spherical surface that slides in contact with the second conductive terminal.

[0012] Furthermore, the liquid outlet has a tapered structure that gradually narrows towards the side facing the inlet.

[0013] Furthermore, the auxiliary part also includes a wedge-shaped sealing plug that fits into the liquid outlet hole and an elastic strip fixedly disposed in the liquid storage cavity and horizontally blocking the sealing plug at one end facing the liquid storage cavity. The sealing plug is conical and has a conical end that can be moved into the insertion port. The end of the conical end has a second spherical surface that slides in contact with the second conductive terminal. The elastic strip partially blocks the inner end of the sealing plug. When the second conductive terminal squeezes the conical end, a gap is formed between the sealing plug and the liquid outlet hole for the functional liquid to flow out.

[0014] Furthermore, the second conductive terminal has a clearance groove for the conical end to extend into after the mating portion and the mating cavity are installed.

[0015] The small-pitch board-to-board rectangular connector assembly of the present invention has at least the following beneficial effects: By providing a centering portion on the mating portion, and by elastically pressing the side walls of the mating cavity in different directions through the centering portion, the mating portion is passively centered under the mutual pressing action between the elastic centering end and the mating cavity. This gradually aligns the mating portion and the mating cavity during the mating process, preventing large deviations in the fit between the first conductive terminal and the second conductive terminal from affecting the conductivity and improving reliability. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of a structure of an embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 2 This is a half-sectional schematic diagram of an embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 3 This is a schematic diagram of the structure of the first connector in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 4 This is a front view of the first connector in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 5 This is a side sectional view of the first connector in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 6 for Figure 5 An enlarged view of part A shown; Figure 7 This is a schematic diagram of the structure of the second connector in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 8This is a schematic diagram of the structure of the second connector (from another angle) in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 9 This is a side sectional view of the second connector in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 10 This is a schematic diagram of the main housing structure in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention; Figure 11 This is a partial schematic diagram of the second plastic housing in one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention. The meanings of the labels in the attached diagram are as follows: First plastic shell 1, main body 1a, interlocking part 1b, inner cavity 11, interlocking port 111, fitting groove 12, first side groove 121, second side groove 122, first insertion cavity 13, first cavity section 131, second cavity section 132, third cavity section 133, boss 134, first conductive terminal 2, first welding end 21, first tight fitting section 22, elastic arm 23, contact point 231, end point 232, centering part 3, centering plate 3a, base 31, elastic centering end 32, arch 321, auxiliary part 4, liquid storage cavity 41, outlet Liquid hole 42, first spherical surface 421, sealing plug 43, inner end 431, conical end 432, elastic strip 44, second plastic shell 5, interlocking cavity 5a, main shell 5b, secondary shell 5c, inner insertion part 51, second insertion cavity 52, fourth cavity section 521, fifth cavity section 522, guide groove 53, guide opening 531, shielding sheet 54, guide slope 541, third insertion cavity 55, second conductive terminal 6, second welding end 61, second fastening section 62, first section 621, second section 622, third section 623, mating end 63. Detailed Implementation

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Please see Figure 1 and Figure 2 The small-pitch board-to-board rectangular connector assembly of the present invention includes a first connector and a second connector that are mated together. The first connector has a mating portion 1b, and the second connector has a mating cavity 5a corresponding to the mating portion 1b. The mating portion 1b is used to be inserted into the mating cavity 5a to complete the connection and conduction of the first connector and the second connector.

[0019] Please see Figures 3 to 6 The first connector includes a first plastic housing 1 and a first conductive terminal 2 mounted on the first plastic housing 1.

[0020] In this embodiment, the first plastic housing 1 is made of plastic and has a first surface and a second surface that are relatively distributed along a mating direction, wherein the thickness direction of the first plastic housing 1 is configured as the mating direction. A mating portion 1b is protruding from the first surface along the mating direction, and the mating portion 1b has a geometrical three-dimensional structure, such as a cuboid shape. An inner mating cavity 11 is formed within the mating portion 1b, making the interior of the mating portion 1b hollow. The inner mating cavity 11 is uniformly formed along the mating direction and extends through the side of the mating portion 1b away from the second surface to form a mating opening 111. The mating opening 111 is used to mate with the second connector so that the corresponding part of the second connector passes through it. The mating opening 111 is also formed uniformly from the inner mating cavity 11 along the mating direction. The surface portion of the mating portion 1b located between the mating opening 111 side and the side near the second surface is configured as an outer wall. To facilitate the mating and engagement between the mating portion 1b and the second connector, the outer wall of the mating portion 1b can be made to gradually narrow towards the mating opening 111 side. The size of the insertion part 1b is smaller than the size of the first surface, so that a stepped surface is formed between each outer wall and the first surface.

[0021] In order to achieve centering effect when the mating part 1b is inserted into the mating cavity 5a and to ensure that the first conductive terminal 2 and the second connector are aligned and engaged, the mating part 1b is provided with a centering part 3, which is used to perform passive centering when the mating part 1b is inserted into the mating cavity 5a.

[0022] In this embodiment, for ease of understanding, the insertion portion 1b is configured as a cuboid with four corners on its outer side wall, each corner being rounded and configured as a corner portion. The outer side walls are sequentially configured as a first side wall, a second side wall, a third side wall, and a fourth side wall. The center portion 3 includes two diagonally distributed centering pieces 3a. Specifically, the two centering pieces 3a are distributed at two of the diagonally distributed corner positions of the insertion portion 1b. To facilitate the installation of the centering pieces 3a and avoid excessive interference between the centering pieces 3a and the insertion cavity 5a, fitting grooves 12 are provided on the outer side wall of the insertion portion 1b at the two diagonally distributed corner positions. The two sides of the fitting groove 12 extend to the corresponding two outer side walls, respectively, to form a first side groove 121 and a second side groove 122. The first side groove 121 of one fitting groove 12 extends to one side of the first side wall, and the second side groove 122 extends to one side of the second side wall. The first side groove 121 of the other fitting groove 12 is opened to one side of the third side wall, and the second side groove 122 is opened to one side of the fourth side wall.

[0023] Both pairs of middle pieces 3a include a base 31 embedded in the outer wall of the interlocking portion 1b and two elastic centering ends 32 respectively connected to both ends of the base 31. The entire base 31 is located within the fitting groove 12 and faces outward, flush with or recessed into the outer wall. The two ends of the base 31 extend to the two adjacent outer walls of the interlocking portion 1b and extend into the first side groove 121 and the second side groove 122, so that the two elastic centering ends 32 on each pair of middle pieces 3a are respectively located in the first side groove 121 and the second side groove 122, so that each elastic centering end 32 is located on a different outer wall, that is, a total of four elastic centering ends 32 are respectively located on the first side wall, the second side wall, the third side wall and the fourth side wall.

[0024] Specifically, each elastic pair 32 has an outwardly curved section 321 extending out of the fitting groove 12, and the end of the elastic pair 32 away from the base 31 is spaced in the corresponding side groove, so that the curved section 321 of the elastic pair 3 can deform and be housed in the fitting groove 12 after being squeezed.

[0025] In use, the insertion part 1b is inserted into the insertion cavity 5a. When the four arched ends 321 come into contact with the cavity wall of the insertion cavity 5a, they elastically squeeze the cavity wall against each other, thereby squeezing the insertion cavity 5a from the four sides of the insertion part 1b. Through the elastic squeezing and reaction force from different directions of the four arched ends 321, the insertion part 1b is passively centered relative to the insertion cavity 5a. While maintaining the gap to facilitate the fit, the four elastic centering ends 32 also preliminarily position the insertion part 1b in the insertion cavity 5a to a certain extent.

[0026] The portion between the first and second surfaces of the first plastic housing 1 is configured as a main body 1a. A first insertion cavity 13 is formed within the first plastic housing 1 for inserting a first conductive terminal 2 and communicating with an inner insertion cavity 11. The first insertion cavity 13 includes a first cavity segment 131 extending to the second surface, a second cavity segment 132 formed within the main body 1a, and a third cavity segment 133 formed within the insertion portion 1b. The first cavity segment 131 penetrates the second surface along the insertion direction and penetrates the main body 1a along a first direction perpendicular to the insertion direction. The second cavity segment 132 penetrates the second surface along the insertion direction and communicates with the first cavity segment 131. The first conductive terminal 2 is inserted into the cavity from one side of the second surface. In one embodiment, to secure the first conductive terminal 2, first tight-fitting grooves adapted to fit the first conductive terminal 2 are formed on two opposite sides of the second cavity segment 132 for tight insertion. The two first tight-fitting grooves communicate with each other and penetrate the second surface along the insertion direction. The third insertion cavity 55 connects to the second cavity segment 132 along the insertion direction and connects to the inner insertion cavity 11 inward along the first direction. The dimension of the third cavity segment 133 in the first direction is smaller than that of the second cavity segment 132. A boss 134 is provided on the side of the third cavity segment 133 away from the second cavity segment 132 and close to the inner insertion cavity 11. The boss 134 is used to block the end of the first conductive terminal 2 and provides space for the terminal of the first conductive terminal 2 to pass through between it and the third cavity segment 133. It should be noted that the first insertion cavities 13 are provided in multiple quantities corresponding to the number of first conductive terminals 2, and can be set in two groups. The two groups of first insertion cavities 13 are spaced apart along the first direction, and each group has multiple first insertion cavities 13 along a second direction. The second direction is perpendicular to the insertion direction and the first direction. It should be noted that the first direction can be the direction of the width of the first plastic shell 1, and the second direction can be the direction of the length of the first plastic shell 1.

[0027] To extend service life, an auxiliary part 4 is provided at the mating joint 111. This auxiliary part 4 is used to apply a functional fluid to the second connector during installation, thereby improving the overall service life of the second connector. Specifically, the auxiliary part 4 includes a reservoir 41 extending into the mating joint 1b and directly opposite the mating joint 111; a liquid outlet 42 connecting the reservoir 41 and the mating joint 111; a wedge-shaped sealing plug 43 fitted into the liquid outlet 42; and an elastic strip 44 fixedly disposed within the reservoir 41 and horizontally blocking the sealing plug 43 at one end 431 of the reservoir 41. Two reservoirs 41 are provided, located on either side of the mating joint 1b along a first direction. Both reservoirs 41 extend along a second direction to cover the mating joint 111. A functional fluid, which is a liquid that does not affect the use of the connector, such as a lubricant and / or cleaner, for example, Novec from 3M Company, is contained within the liquid outlet. TMThis series of contact cleaners / lubricants are non-flammable, have extremely low toxicity, and are material compatible. They penetrate and clean, leaving a thin protective layer. Their descriptions clearly state their use in sensitive devices such as electrical components, connectors, and switches. For example, electronic fluorinated fluid, model: Novec 7100, brand: 3M electronic fluorinated fluid. The outlet holes 42, corresponding to the number of the first conductive terminals 2, are located on the inner walls of the two sides of the socket 111, which has a reservoir 41, to allow functional fluid to seep into the socket 111 through the reservoir holes.

[0028] To facilitate easier contact between the second connector and the outlet hole 42, a hemispherical protrusion is formed on the inner wall of the mating port 111, surrounding the outlet hole 42. This allows the outer wall of the outlet hole 42 to protrude inward (towards the mating port 111) and form a first spherical surface 421 that slides in contact with the corresponding structure of the second connector. To slow down the flow rate of the functional fluid and prevent excessive leakage, the outlet hole 42 has a tapered structure that gradually narrows towards the mating port 111. This allows the functional fluid to more easily form an oil film at the outlet hole 42, preventing leakage. However, when the second connector comes into contact with it, a small amount of functional fluid may transfer to the second connector due to the fluid's extensibility.

[0029] To prevent the functional fluid from clogging the outlet hole 42 and to prevent leakage when the insertion port 111 is not in use (i.e., the second connector and the insertion part 1b are not mated), a sealing plug 43 is movably installed inside the outlet hole 42. The sealing plug 43 is conical and has an inner end 431 facing the liquid storage cavity 41 and a conical end 432 that movably penetrates into the insertion port 111. The end of the conical end 432 has a spherical second spherical surface. When the insertion port 111 is not in use, the conical end 432 protrudes from the outlet hole 42 and is located inside the insertion port 111. When the second connector is inserted into the inner insertion cavity 11, the corresponding structure of the second connector presses against the second spherical surface and slides against it, causing the sealing plug 43 to be pressed and moved toward the liquid storage cavity 41. After the sealing plug 43 moves, a gap is formed between the sealing plug 43 and the outlet hole 42 for the functional fluid to flow out.

[0030] To prevent the sealing plug 43 from retracting directly into the liquid storage chamber 41, an elastic strip 44 is fixedly installed inside the liquid storage chamber 41 and partially blocks the inner end 431 of the sealing plug 43. The elastic strip 44 can be in the shape of a straight line or a cross, etc., and is placed horizontally on the inner end 431. The elastic strip 44 can be made of elastic metal wire or nitrile rubber, etc., which can drive the sealing plug 43 to reset after being squeezed, and at the same time prevent the sealing plug 43 from retracting directly into the liquid storage chamber 41. To facilitate the processing of the sealing plug 43, a horizontal strip can be integrally formed between two adjacent sealing plugs 43 in each group. The setting of the conical end 432 and the opening of the liquid outlet 42 must ensure that their insertion depth in the socket 111 can contact the corresponding structure of the second connector.

[0031] In this embodiment, the first conductive terminal 2 includes a first welding end 21 for mounting in the first cavity 131, a first fitting section 22 for mounting in the second cavity 132, and an elastic arm 23 for mounting in the third cavity 133. The first welding end 21 extends out of the first plastic housing 1 from the first cavity 131 along a first direction and is used to weld to the circuit board to achieve conductivity. The opposite sides of the first fitting section 22 protrude backward to form a first widened side, which is used to be inserted into the first fitting groove along the insertion direction. Barbs may be provided on the first widened side to abut against the first fitting groove, thereby achieving initial positioning of the first conductive terminal 2. The elastic arm 23 extends from the first tight fitting end along the insertion direction toward the side away from the first welding end 21, and the end of the elastic arm 23 away from the first tight fitting section 22 is inclined to one side along the first direction or its thickness direction. The elastic arm 23 has a contact point 231 that is arched in the middle along the first direction toward one side and an end point 232 that is bent in the opposite direction from the contact point 231 and used to abut against the boss 134.

[0032] When the first conductive terminal 2 is installed, the first solder end 21 is located in the first cavity 131, the first tight fitting section 22 is located in the second cavity 132 and the first widened side is tightly fitted in the first tight fitting groove, the elastic arm 23 passes into the third cavity 133 and the end point 232 passes into the space between the boss 134 and the third cavity 133 and abuts against the boss 134, and the contact point 231 protrudes into the mating cavity 5a for mating with the second connector.

[0033] Please see Figures 7 to 11 The second connector includes a second plastic housing 5 and a second conductive terminal 6 mounted on the second plastic housing 5.

[0034] In this embodiment, the second plastic housing 5 includes a main housing 5b and a secondary housing 5c ​​for increasing the overall height of the second plastic housing 5. The main housing 5b has a third surface and a fourth surface that are relatively distributed along the insertion direction. A mating cavity 5a is formed inside the main housing 5b to accommodate the mating part 1b for insertion. The mating cavity 5a extends through the third surface. An inner insertion part 51 is provided in the mating cavity 5a at its central position, protruding from the side near the fourth surface towards the third surface along the insertion direction. The inner insertion part 51 is used to be inserted into the inner insertion cavity 11. Second insertion cavities 52 are provided on both sides of the inner insertion part 51 corresponding to the two sets of first conductive terminals 2. The number of second insertion cavities 52 corresponds to the number and position of the first conductive terminals 2 and extends through the inner insertion part 51 and the fourth surface along the insertion direction. Each second insertion cavity 52 is connected to the mating cavity 5a along the first direction. The second insertion cavity 52 includes a fourth cavity segment 521 formed on the inner insertion portion 51 and a fifth cavity segment 522 penetrating the fourth surface. The fourth cavity segment 521 connects to the insertion cavity 5a. The fifth cavity segment 522 has second tight-fitting grooves formed on opposite sides by back-facing recesses. The second tight-fitting grooves are provided to penetrate the fourth surface along the insertion direction. The secondary housing 5c ​​is block-shaped and has a third insertion cavity 55 formed thereon.

[0035] To prevent the centering portion 3 from shifting, guide grooves 53 are provided on the insertion cavity 5a at positions corresponding to each elastic centering end 32, allowing the elastic centering end 32 to extend into it along the insertion direction and communicate inwardly with the insertion cavity 5a. Specifically, the insertion cavity 5a is configured as a first cavity wall, a second cavity wall, a third cavity wall, and a fourth cavity wall, corresponding to the four outer walls of the insertion portion 1b, and a guide groove 53 is provided on each cavity wall at a position corresponding to each elastic centering end 32. The guide groove 53 communicates inwardly with the insertion cavity 5a and extends through the third surface along the insertion direction to form a slot. To allow the arched portion 321 to quickly enter it, the slot of the guide groove 53 is formed into a wide-mouthed guide opening 531. A shielding plate 54 is provided in the guide groove 53. One end of the shielding plate 54 is located at the guide opening 531 and has a guide slope 541 that allows the elastic centering end 32 to enter the guide groove 53 inward. The guide slope 541 and the guide opening 531 allow the measured arch 321 to slide quickly into the guide groove 53. The shielding plate 54 can cooperate with the centering part 3, which is made of metal, to a certain extent to shield electromagnetic interference.

[0036] In this embodiment, the second conductive terminal 6 includes a second welding end 61, a second fastening section 62, and a mating end 63. The second welding end 61 is located outside the sub-housing 5c ​​and extends from the end of the second fastening section 62 along a first direction after being bent, for welding to another circuit board.

[0037] The second fastening section 62 includes a first section 621 for insertion into the third insertion cavity 55, a second section 622 located between the secondary housing 5c ​​and the main housing 5b, and a third section 623 for insertion into the fifth cavity section 522. The second section 622 is exposed and its length can be adjusted according to the overall height requirements of the second connector, reducing the material used for the second plastic housing 5. The opposite sides of the third section 623 protrude in opposite directions to form a second widened side, which is used to insert into the second fastening groove to achieve a tight fit between the second conductive terminal 6 and the second plastic housing 5. Similarly, barbs can be formed on the second widened side for abutment fit.

[0038] The mating end 63 extends from the third segment 623 along the insertion direction and is located within the fourth cavity segment 521. To avoid interference between the mating end 63 and the mating cavity 5a when the mating part 1b and the mating cavity 5a are mated, and between the inner insertion part 51 and the inner insertion cavity 11 when mated, thus affecting the installation, the end of the mating end 63 away from the second welding end 61 is inclined towards the center of the inner insertion part 51 in the first direction so that it does not contact the contact point 231. The end of the mating end 63 close to the second welding end 61 must be able to compress the contact point 231 and the conical end 432 of the sealing plug 43.

[0039] In order to prevent the functional fluid from continuously seeping out of the liquid outlet 42 when the first connector and the second connector are connected, a relief groove is provided on the mating end 63 near the second welding end 61 for the conical end 432 to extend into after the mating part 1b and the mating cavity 5a are installed. The relief groove is curved or spherical to facilitate the sliding of the conical end 432 in and out.

[0040] The operation of one embodiment of the small-pitch board-to-board rectangular connector assembly of the present invention is as follows: After the first surface and the third surface are aligned, the mating part 1b is inserted into the mating cavity 5a. During the insertion process, each arch 321 slides quickly into the corresponding guide groove 53 through the corresponding guide opening 531 and guide slope 541. Each elastic centering end 32 passively centers the mating part 1b in the mating cavity 5a by pressing the shielding sheet 54, ensuring that the spacing between the outer wall of the mating part 1b and each cavity wall of the mating cavity 5a is uniform; internal insertion Part 51 and the second conductive terminal 6 pass through the insertion port 111 and enter the insertion cavity 5a. The second insertion cavity 52 prevents the inner insertion part 51 from contacting the conical end 432. The mating end 63, which is close to the second welding end 61, gradually contacts and squeezes the conical end 432, causing the functional liquid in the liquid storage cavity 41 to seep out from the liquid outlet 42 and be coated on the mating end 63 through contact with the second conductive terminal 6. After the insertion part 1b and the insertion cavity 5a are installed, the conical end 432 aligns with the relief groove, and the sealing plug 43 blocks the liquid outlet 42 under the rebound of the elastic strip 44.

[0041] Compared with the prior art, the small-pitch board-to-board rectangular connector assembly of the present invention enables the mating part 1b and the mating cavity 5a to achieve self-alignment even when there is a large gap between them, ensuring the alignment and cooperation of the first conductive terminal 2 and the second conductive terminal 6, and improving reliability. The auxiliary part 4 can coat the second conductive terminal 6 with functional liquid during the assembly of the second conductive terminal 6 and the first conductive terminal 2, and the contact between the first conductive terminal 2 and the second conductive terminal 6 can also make the first conductive terminal 2 locally coated with functional liquid, thereby improving the reliability and service life of the first conductive terminal 2 and the second conductive terminal 6.

Claims

1. A small-pitch board-to-board rectangular connector assembly, characterized in that: The device includes a first connector and a second connector. The first connector includes a first plastic housing and a first conductive terminal mounted on the first plastic housing. The first plastic housing has a mating portion protruding along a mating direction. The second connector includes a second plastic housing and a second conductive terminal mounted on the second plastic housing. The second plastic housing has a mating cavity for the mating portion to move through in the mating direction. The mating portion has a centering portion with multiple elastic centering ends for elastically pressing the side walls of the mating cavity in multiple directions when the mating portion is inserted into the mating cavity.

2. The small-pitch board-to-board rectangular connector assembly as described in claim 1, characterized in that: The centering portion includes two centering plates arranged diagonally. Each centering plate includes a base embedded in the outer wall of the insertion portion and two elastic centering ends respectively connected to both ends of the base. The two ends of the base extend to two adjacent outer walls of the insertion portion, and each elastic centering end is located on a different outer wall.

3. The small-pitch board-to-board rectangular connector assembly as described in claim 2, characterized in that: The two corners of the outer side wall of the insertion part are provided with fitting grooves. The two sides of the fitting grooves extend to the corresponding two outer side walls to have a first side groove and a second side groove. The base is fixedly installed in the fitting groove. The two elastic centering ends extend from the corresponding ends of the base along the insertion direction to the first side groove and the second side groove, respectively. The elastic centering ends have an outward arch in the middle to extend out of the fitting groove.

4. The small-pitch board-to-board rectangular connector assembly as described in any one of claims 1 to 3, characterized in that: The interlocking cavity is provided with guide grooves at the positions corresponding to each elastic centering end, allowing the elastic centering end to extend into it along the interlocking direction and communicate with the interlocking cavity inward. The groove opening of the guide groove has a wide-mouthed guide opening.

5. The small-pitch board-to-board rectangular connector assembly as described in claim 4, characterized in that: The guide groove is provided with a shielding plate, one end of which is located at the guide opening and has a guide slope that allows the elastic centering end to enter the guide groove inward.

6. The small-pitch board-to-board rectangular connector assembly as described in claim 1, characterized in that: The mating part has an inner cavity for inserting the second conductive terminal in the mating direction. The first plastic housing has a first insertion cavity for inserting the first conductive terminal and communicating with the inner cavity. The inner cavity has a mating port that passes through the mating part and allows the second conductive terminal to pass through. The mating port has an auxiliary part for coating the second conductive terminal with functional liquid when it passes through the mating port.

7. The small-pitch board-to-board rectangular connector assembly as described in claim 6, characterized in that: The auxiliary part includes a liquid storage cavity opened into the interlocking part and facing the interlocking port, and a liquid outlet hole connecting the liquid storage cavity and the interlocking port. The outer wall of the liquid outlet hole protrudes inward into the interlocking port and forms a first spherical surface that slides in contact with the second conductive terminal.

8. The small-pitch board-to-board rectangular connector assembly as described in claim 7, characterized in that: The liquid outlet has a tapered structure that gradually narrows towards the insertion port.

9. The small-pitch board-to-board rectangular connector assembly as described in claim 8, characterized in that: The auxiliary part also includes a wedge-shaped sealing plug that fits into the liquid outlet hole and an elastic strip fixedly disposed in the liquid storage cavity and horizontally blocking the sealing plug at one end facing the liquid storage cavity. The sealing plug is conical and has a conical end that can be moved into the insertion port. The end of the conical end has a second spherical surface that slides in contact with the second conductive terminal. The elastic strip partially blocks the inner end of the sealing plug. When the second conductive terminal squeezes the conical end, a gap is formed between the sealing plug and the liquid outlet hole for the functional liquid to flow out.

10. The small-pitch board-to-board rectangular connector assembly as described in claim 9, characterized in that: The second conductive terminal has a clearance groove for the conical end to extend into after the mating part and the mating cavity are installed.

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