TW201818616A - Electrical connector including a first socket unit, a second socket unit and a metal cover that can allow insertion of two electronic cards at the same time - Google Patents

Abstract

An electrical connector includes a first socket unit, a second socket unit stacked above and behind the first socket unit, and a metal cover. The first socket unit includes a first insulating shell and a plurality of first terminals. The first insulating shell has two first side portions on the left and right sides, and each first side portion has a first groove. The second socket unit includes a second insulating shell and a plurality of second terminals. The second insulating shell has two second side portions on the left and right sides, and each second side portion has a second groove, and the two second grooves respectively opposite to the two first grooves in the front and the rear directions. The metal cover comprises a main cover body and two side cover bodies respectively located on the left and right sides. Each side cover body has a flat plate portion connecting the main cover body. A limiting portion extends from the bottom end of the flat plate portion and extends into the first groove and the second groove on the corresponding side, the limiting portion can float in the up and down direction in the corresponding first groove and second groove.

Description

Electrical connector and terminal

The invention relates to an electrical connector, in particular to an electrical connector and a terminal for simultaneously inserting two electronic cards.

Generally, the electrical connector for inserting two electronic cards at the same time usually has two slots arranged one above the other. If the insulating shell of the electrical connector is an integral structure, the problem of warpage is easy to occur, and the electrical connector If a plurality of terminals are to be soldered to the circuit board by surface soldering, it is also prone to the problem that the tail portions of the terminals are not completely coplanar, and some of the terminals are free-welded.

An existing electrical connector, such as disclosed in Japanese Patent No. M 368 946 (Chinese Patent No. CN201397923, U.S. Patent No. 7,793,495), includes a first connector, a second connector, and a card ejecting member. The first connecting base and the second connecting base are movably positioned to solve the problem that the terminals are not all coplanar. The first connecting base includes a first body and a plurality of first terminals fixed to the first body, the first body includes a first base and two first sides respectively extending forward from the two ends of the first base arm. The second connecting base includes a second body and a plurality of second terminals fixed to the second body, the second body includes a second base and two second sides extending forward from opposite ends of the second base arm. However, since the second connecting seat is received in the first side arm of the first connecting base and the inner side of the first base, the bottom surface of the second connecting seat cannot be visually inspected from the outside of the first connecting seat. The bottom surface of the connector is coplanar.

Furthermore, in order to position the first connecting seat and the second connecting seat by the ejecting member, the first and second sliding grooves are recessed in each of the first side arms, and the second side arm is recessed in each of the second side arms. The third sliding groove is in parallel with and connected to the second sliding groove. In addition to the first and second sliding slots, the first side arm is provided with two guiding slots for the electronic card to be inserted, and a receiving portion for receiving the second side arm, thereby making the first body The overall structure is complex and relatively difficult to manufacture.

Accordingly, it is an object of the present invention to provide an electrical connector that is easier to manufacture, less prone to warpage, and that is easily visually inspected to avoid void welding.

Accordingly, another object of the present invention is to provide a terminal that can adjust the tail section to be coplanar with the tail sections of other terminals.

Thus, in some embodiments, the electrical connector of the present invention comprises: a first socket unit, a second socket unit, and a metal cover. The first socket unit includes a first insulating shell and a plurality of first terminals disposed on the first insulating shell, the first insulating shell has a first body provided with the first terminals, and two are respectively located a first side portion on the left and right sides, and each of the first side portions has a first outer side surface facing a left-right direction, and a first concave portion extending from the first outer side surface and extending in a front-rear direction a groove. The second socket unit includes a second insulating shell and a plurality of second terminals disposed on the second insulating shell, the second insulating shell has a second body provided with the second terminals, and two of the two are respectively located a second side portion on the left and right sides, and each of the second side portions has a second outer side surface facing the left and right direction, and a second inner side surface recessed in the front and rear direction and elongated a second recess is disposed above the first body, and the two second sides are at least partially located behind the first side portions, respectively, and the second recess on the corresponding side is The first grooves are opposite in the front-rear direction. The metal cover includes a main cover body at least partially covering the second body, and two side cover bodies respectively located on the left and right sides, each side cover body having a connection with the main cover body and at least partially covering the corresponding side a flat portion of the first outer side surface and the second outer side surface, and a limit portion bent from the bottom end of the flat plate portion and extending into the first groove and the second groove on the corresponding side, and The limiting portion may float in a vertical direction in the corresponding first groove and the second groove.

In some implementations, the first socket unit further includes two first fixing members respectively disposed on the bottom sides of the two first side portions, and the second socket unit further includes two second side portions respectively disposed on the two second sides a second fixing member on the bottom side of the portion.

In some embodiments, the second insulative housing further has two cylindrical portions extending from the two second side portions and located in front of the first side portion on the corresponding side, each of the columnar portions and the corresponding side The second side portion collectively defines a recess to receive the first side portion on the corresponding side.

In some implementations, the first socket unit further includes two first fixing members respectively disposed on the bottom sides of the two first side portions, and the second socket unit further includes two second side portions respectively disposed on the two second sides a second fixing member on the bottom side of the portion, and two third fixing members respectively disposed on the bottom sides of the two column portions.

In some embodiments, the second socket unit further includes two stops, and each of the second side rear sides of the second insulating case forms a limit extending in the up and down direction and accommodating one of the stops a groove, such that the blocking member straddles the corresponding rear surface of the second groove in the up-and-down direction, thereby stopping the metal cover from moving backward, and the second insulating shell further has a convex upward and close The upper flange of the front side, the front edge of the main cover abuts against the upper flange, thereby stopping the metal cover from moving forward.

In some embodiments, the second socket unit further includes two stops, and each of the second side rear sides of the second insulating case forms a limit extending in the up and down direction and accommodating one of the stops a groove, such that the blocking member straddles the corresponding second groove in the up-and-down direction, thereby stopping the corresponding positional portion from moving backward, and the column portion on the corresponding side blocks the The limit unit moves forward.

In some embodiments, each of the first grooves penetrates the corresponding first side portion in the front-rear direction, and each of the second grooves penetrates the corresponding second side portion in the front-rear direction, so as to be located The first groove on the corresponding side is in communication with the second groove.

In some embodiments, the main cover has a top plate portion above the second body, and a rear plate portion extending rearward and downward from the top plate portion.

In some embodiments, the rear plate portion has a plurality of venting holes.

In some embodiments, the first body has a first base, and a first abutting portion extending forwardly from the first base, the first butting portion has a first slot with a socket facing forward, The second body has a second base portion and a second abutting portion extending forwardly from the second base portion, the second mating portion having a second slot with the socket facing forward.

In some embodiments, the first body further has a plurality of first reinforcing ribs connected between the first base and the first abutting portion, the second body further having a plurality of connected to the second base a second reinforcing rib between the second abutting portions.

In some embodiments, at least a portion of the first reinforcing ribs extend to a leading edge of the first abutting portion, at least a portion of the second reinforcing ribs extending to a leading edge of the second abutting portion.

In some embodiments, each of the first terminals has a first body segment fixed to the first body, a first contact segment connecting the one end of the first body segment and extending into the first slot, and Connecting the other end of the first body segment and extending out of the first tail segment of the first body, each second terminal has a second body segment fixed to the second body, and a second body segment connected One end extends into the second contact section of the second slot, and a second end of the second body segment is connected to the other end of the second body segment.

In some embodiments, each of the second terminals is formed into a flat shape by punching a metal piece, and each of the second terminals further has a curved connection between the second body segment and the second tail segment. Adjusting the segment, and the width of the adjusting segment is smaller than the second body segment and the second tail segment for deformably adjusting the second tail segment closer to or farther from the second body segment.

In some embodiments, each of the second tail segments has a downwardly facing arcuate contact surface for contacting a circuit board.

In some embodiments, the ends of the adjustment segment are gradually widened toward a width that is respectively connected to the second body segment and the second tail segment.

In some embodiments, the surface area of the second tail section is greater than the surface area of the adjustment section.

In some embodiments, the width of the adjustment segment is from 1 to 1.1 times the thickness of the second terminal plate body.

In some embodiments, each of the first side portions further has a dovetail-shaped projection protruding rearward, and each of the second side portions further has a dovetail groove recessed toward the rear to correspond to the corresponding side The dovetail-shaped bumps on one side are engaged in the up-and-down direction, and the first insulative housing and the second insulative housing are relatively fixed in the front-rear direction and the left-right direction.

Therefore, in some embodiments, the terminal of the present invention is formed into a flat shape by punching a metal sheet, and has a main body section, a contact section connecting one end of the main body section, and a other end connected to the main body section. The first tail section is characterized in that: the terminal further has an adjustment section that is bently connected between the main body section and the tail section, and the width of the adjustment section is smaller than the main body section and the tail section, The tail section is deformably adjusted closer to or away from the body section.

In some embodiments, the tail section has an arcuate contact surface for contacting a circuit board.

In some embodiments, the ends of the adjustment segment are gradually widened toward the width of the junction with the body segment and the tail segment, respectively.

In some embodiments, the surface area of the tail section is greater than the surface area of the adjustment section.

In some embodiments, the width of the adjustment segment is from 1 to 1.1 times the thickness of the terminal plate body.

The invention has the following effects: after the first socket unit and the second socket unit are respectively manufactured and assembled, and then assembled together with the metal cover, it is not only convenient to manufacture, but also not easy to cause warping deformation. Furthermore, the first socket unit and the second socket unit are floatable relative to the metal cover to adjust the coplanarity of the first socket unit and the second socket unit bottom when combined with the circuit board, and the first side portion and the second side portion The front and rear parts are arranged, and the portions below the first groove and the second groove are exposed, and it is convenient to visually check whether the bottom of the first socket unit and the bottom of the second socket unit are all flat on the circuit board, thereby avoiding The case of void welding occurs in the process of surface soldering. In addition, the longer second terminal has an adjustment section to easily adjust the contact surface of the second tail section to be coplanar with the contact surfaces of the other second terminals, further ensuring avoidance of empty welding.

Referring to Figures 1 through 3, an embodiment of the electrical connector of the present invention is mounted to a circuit board 8 by surface soldering. Referring to FIGS. 2 to 5 , the electrical connector includes a first socket unit 1 , a second socket unit 2 , and a metal cover 3 .

Referring to FIG. 6 and FIG. 7 , the first socket unit 1 includes a first insulating shell 4 and a plurality of first terminals 5 disposed on the first insulating shell 4 . The first insulative housing 4 has a first body 41 provided with the first terminals 5, and two first side portions 42 respectively located on the left and right sides, and each of the first side portions 42 has a facing orientation a first outer side surface 421 of the direction X, and a first recess 422 recessed by the first outer side surface 421 and extending in a front-back direction Y. The first body 41 has a first base portion 411 and a first abutting portion 412 extending forward from the first base portion 411. The first docking portion 412 has a first slot 413 with a socket facing forward for insertion of a plug connector (not shown). The first body 41 further has a plurality of first reinforcing ribs 414 connected between the first base portion 411 and the first abutting portion 412, and at least a portion of the first reinforcing ribs 414 extend to be close to the first docking portion. The leading edge of the portion 412 serves to strengthen the structural strength of the first insulating case 4 to avoid warping deformation. Moreover, the first insulating shell 4 has some hollow reduction design, which is also used to avoid warping deformation. The first insulative housing 4 further has two first positioning protrusions 43 respectively protruding downward from the two first side portions 42 for penetrating the corresponding perforations of the circuit board 8 (see FIG. 1). As shown in the figure, when the electrical connector is mounted on the circuit board 8, the electrical connector is first positioned opposite the circuit board 8. The first socket unit 1 further includes two first fixing members 11 respectively disposed on the bottom sides of the two first side portions 42 for soldering and fixing to the circuit board 8. Each of the first side portions 42 further has a dovetail-shaped projection 423 protruding rearward for engaging with the second socket unit 2, which will be described in detail below.

The first terminal 5 is mounted on the first body 41 in two rows, and each of the first terminals 5 has a first body segment 51 fixed to the first body 41 and a first body segment 51 connected thereto. One end extends into the first contact section 52 of the first slot 413, and a first end section 53 that connects the other end of the first body section 51 and protrudes outside the first body 41. The first socket unit 1 further includes a first terminal locating member 12, and the first terminal locating member 12 is disposed between the first side portions 42 and behind the first body 41 for A terminal 5 is positioned proximate to the first tail section 53 and the first tail section 53 of the two rows of first terminals 5 are spaced back and forth.

Referring to FIG. 8 to FIG. 12 , the second socket unit 2 includes a second insulating shell 6 and a plurality of second terminals 7 disposed on the second insulating shell 6 . The second insulative housing 6 has a second body 61 provided with the second terminals 7, and two second side portions 62 respectively located on the left and right sides, and each of the second side portions 62 has a direction toward the left and right sides a second outer side surface 621 of the direction X, and a second recess 622 recessed by the second outer side surface 621 and extending in the front-back direction Y. The second body 61 is stacked above the first body 41 (see FIG. 4), and the two second side portions 62 are at least partially located behind the two first side portions 42, respectively, and are located on the corresponding side (the same side) The second groove 622 is opposite to the first groove 422 in the front-rear direction Y. In this embodiment, each of the first recesses 422 extends through the corresponding first side portion 42 in the front-rear direction Y, and each of the second recesses 622 extends through the corresponding second side in the front-rear direction Y. The first groove 422 and the second groove 622 on the corresponding side penetrate the first side portion 42 and the second side portion 62 together, that is, the first groove 422 on the corresponding side is The second grooves 622 are in communication.

The second insulative housing 6 further has two columnar portions 63 extending from the two second side portions 62 and located in front of the first side portion 42 on the corresponding side, each of the columnar portions 63 and the corresponding side The second side portions 62 collectively define a recess 64 to receive the first side portion 42 on the corresponding side such that the stacked structure is more stable. The second socket unit 2 further includes two blocking members 21, and the rear side of each second side portion 62 of the second insulating housing 6 defines a limiting slot extending in an up-and-down direction Z and accommodating one of the blocking members 21 623, such that the blocking member 21 straddles the corresponding rear side of the second recess 622 in the up-and-down direction Z (see FIG. 3). The second socket unit 2 further includes two second fixing members 22 respectively disposed on the bottom sides of the two side portions 62, and two third fixing members 23 respectively disposed on the bottom sides of the two column portions 63. The second fixing member 22 and the third fixing member 23 are soldered and fixed to the circuit board 8 (see FIG. 1). Similarly, the second insulative housing 6 further has two second positioning protrusions 65 extending downwardly from the two second side portions 62 for penetrating the corresponding through holes of the circuit board 8 (not shown). ). Moreover, each of the second side portions 62 further has a dovetail groove 624 recessed toward the rear to engage with the dovetail-shaped projections 423 on the first side portion 42 of the corresponding side in the up-and-down direction Z (see FIG. 14). The first insulating case 4 and the second insulating case 6 are relatively fixed in the front-rear direction Y and the left-right direction X.

The second body 61 has a second base portion 611 and a second abutting portion 612 extending forwardly from the second base portion 611. The second mating portion 612 has a second slot 613 with a socket facing forward. A plug connector (not shown) is inserted. The second body 61 further has a plurality of second reinforcing ribs 614 connected between the second base portion 611 and the second abutting portion 612, and at least a portion of the second reinforcing ribs 614 extend to the second butt joint. The leading edge of the portion 612 serves to strengthen the structural strength of the second insulating case 6 to avoid warping deformation. Moreover, the second insulating shell 6 has some hollow reduction design, which is also used to avoid warping deformation.

The second terminals 7 are mounted on the second body 61 in two rows. In addition, referring to FIG. 13 , each of the second terminals 7 is formed by punching a metal sheet and has a flat shape. a second body segment 71 of the second body 61, an end connecting the second body segment 71 and extending into the second contact portion 72 of the second slot 613, and a connecting end of the second body segment 71 A second tail section 73 outside the second body 61 has a downwardly facing arcuate contact surface 731 for contacting the circuit board 8 (see FIG. 1). Moreover, each of the second terminals 7 further has an adjustment section 74 bently connected between the second body section 71 and the second tail section 73, and the width of the adjustment section 74 is smaller than the second body section 71 and The second tail section 73 is configured to deformably adjust the second tail section 73 closer to or away from the second body section 71, that is, the position of the second tail section 73 can be fixed after adjustment to adjust the The contact surface 731 of the two terminals 7 and the contact surface 731 of the other second terminals 7 may be coplanar. The width of the adjustment section 74 is 1 to 1.1 times, preferably about 1 time, the thickness of the second terminal 7 plate body, so that the adjustment section 74 can be easily fine-tuned and the position of the second tail section 73 can be fixed. Moreover, the contact surface 731 of the second tail section 73 is curved, and the circuit board 8 can be contacted at different positions on the contact surface 731 after the adjustment position. Both ends of the adjustment section 74 are gradually widened toward the joint with the second body section 71 and the second tail section 73 to strengthen the joint force at the joint. In addition, the surface area of the second tail section 73 is larger than the surface area of the adjustment section 74 for improving signal integrity (SI). In this embodiment, the second socket unit 2 further includes a second terminal locating member 24, and the second terminal locating member 24 is disposed between the two second side portions 62 and behind the second body 61. The second tails 7 of the second terminals 7 are positioned adjacent to the second tail section 73, and the second tail sections 73 of the two rows of second terminals 7 are spaced back and forth. Moreover, the second socket unit 2 further includes a plurality of grounding members 25 for connecting the second terminals 7 therein for grounding.

Referring to FIG. 3 to FIG. 5 and FIG. 11 , the metal cover 3 includes a main cover 31 at least partially covering the second body 61 , and two side covers 32 respectively connected to the left and right sides of the main cover 31 . . The main cover 31 has a top plate portion 311 located above the second body 61, and a rear plate portion 312 extending rearward and downward from the top plate portion 311. The rear plate portion 312 has a plurality of ventilation holes 313 to facilitate heat dissipation. The second insulative housing 6 further has an upper flange 66 projecting upwardly and adjacent to the front side. The front edge of the main cover 31 abuts against the upper flange 66 to prevent the metal cover 3 from moving forward. Each of the side cover bodies 32 has a flat plate portion 321 that connects the main cover body 31 and at least partially covers the first outer side surface 421 and the second outer side surface 621 on the corresponding side, and a bottom portion bent by the flat plate portion 321 And extending and extending into the first recess 422 and the limiting portion 322 of the second recess 622 on the corresponding side, and the limiting portion 322 can be in the corresponding first recess 422 and the second recess The inner portion 622 floats in the up and down direction Z. That is, the width of the first groove 422 and the second groove 622 in the up and down direction Z is greater than the thickness of the plate body of the limiting portion 322, so that the first socket unit 1 and the second socket unit 2 can pass through the metal cover 3 The combination does not separate, but the first socket unit 1 and the second socket unit 2 can still move relatively slightly relative to each other to adjust the coplanarity of the bottom when combined with the circuit board 8. Moreover, in the embodiment, the portions of the first side portion 42 of the first socket unit 1 and the second side portions 62 of the second socket unit 2 below the first recess 422 and the second recess 622 are All of them are exposed, and it is convenient to visually inspect whether the bottom of the first socket unit 1 and the bottom of the second socket unit 2 are all flat on the circuit board 8, so as to avoid the occurrence of empty welding in the surface soldering process.

In the embodiment, the first side portion 42 and the second groove 622 are inserted through the first side portion 42 and the second groove 622 in the front-rear direction Y through the second side portion 62. In the assembly, the first socket unit is first assembled. 1 is stacked with the second socket unit 2, and then the metal cover 3 is placed behind the second socket unit 2, and the two limiting portions 322 of the metal cover 3 are respectively aligned with the second grooves 622 on the left and right sides, and then The metal cover 3 is moved from the back to the front, so that the two limiting portions 322 respectively enter the second groove 622 and the first groove 422 on the left and right sides. The columnar portion 63 on the corresponding side can block the restricting portion 322 from moving forward, in which case the upper flange 66 of the second insulating case 6 can be selectively removed. Then, the two stoppers 21 are respectively placed in the limiting slots 623, thereby stopping the corresponding limiting portions 322 from moving backward, that is, stopping the metal cover 3 from moving backward. In this way, the first socket unit 1, the second socket unit 2, and the metal cover 3 can be assembled without being separated, and the assembly process is simple.

In summary, after the first socket unit 1 and the second socket unit 2 are respectively manufactured and assembled, they are assembled together with the metal cover 3, which is not only convenient to manufacture, but also less likely to cause warping deformation. Furthermore, the first socket unit 1 and the second socket unit 2 can float relative to the metal cover 3 to adjust the coplanarity of the bottom of the first socket unit 1 and the second socket unit 2 when combined with the circuit board 8, and first The side portion 42 and the second side portion 62 are arranged one behind the other, and the portions below the first groove 422 and the second groove 622 are exposed, and the bottom of the first socket unit 1 and the second socket unit 2 can be visually inspected visually. Whether the bottom is flat on the circuit board 8 to avoid the occurrence of empty soldering in the surface soldering process. In addition, the longer second terminal 7 has an adjustment section 74 to facilitate adjustment of the contact surface 731 of the second tail section 73 to be coplanar with the contact surface 731 of the other second terminal 7, further ensuring that void welding is avoided.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧First outlet unit
11‧‧‧First fixture
12‧‧‧First terminal positioning piece
2‧‧‧second socket unit
21‧‧‧ §
22‧‧‧Second fixture
23‧‧‧ Third fixture
24‧‧‧Second terminal locator
25‧‧‧ Grounding parts
3‧‧‧Metal cover
31‧‧‧Main cover
311‧‧‧Top Board
312‧‧‧ Rear Plate Department
313‧‧‧Ventinel
32‧‧‧ side cover
321‧‧‧ Flat section
322‧‧‧Limited
4‧‧‧First Insulation Shell
41‧‧‧First Ontology
411‧‧‧ first base
412‧‧‧First docking
413‧‧‧first slot
414‧‧‧First rib
42‧‧‧ first side
421‧‧‧ first outer side
422‧‧‧first groove
423‧‧‧Bumps
43‧‧‧First positioning stud
5‧‧‧First terminal
51‧‧‧First main body segment
52‧‧‧First contact segment
53‧‧‧First tail paragraph
6‧‧‧Second insulation shell
61‧‧‧Second ontology
611‧‧‧ Second base
612‧‧‧Second docking department
613‧‧‧second slot
614‧‧‧second reinforcement rib
62‧‧‧ second side
621‧‧‧Second outer side
622‧‧‧second groove
623‧‧‧Limited slot
624‧‧‧鸠尾槽
63‧‧‧ Column
64‧‧‧Depression
65‧‧‧Second positioning stud
66‧‧‧Upper flange
7‧‧‧second terminal
71‧‧‧Second main body
72‧‧‧second contact section
73‧‧‧second tail paragraph
731‧‧‧Contact surface
74‧‧‧Adjustment section
8‧‧‧ boards
X‧‧‧ direction
Y‧‧‧ direction
Z‧‧‧Up and down direction

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a front view of an embodiment of an electrical connector of the present invention; 3 is a perspective view of FIG. 2; FIG. 4 is an exploded perspective view of the embodiment; FIG. 5 is another perspective view of FIG. 4; Figure 7 is another perspective view of the second socket unit of the embodiment; Figure 8 is an exploded perspective view of the second socket unit of the embodiment; Figure 9 is another perspective view of Figure 8; FIG. 11 is a perspective view of one of the embodiments; FIG. 12 is a side view of FIG. 11; FIG. 13 is a side view of the second terminal of the embodiment; 14 is another angle view of FIG. 2.

Claims (24)

An electrical connector includes: a first socket unit including a first insulative housing and a plurality of first terminals disposed on the first insulative housing, the first insulative housing having a first terminal a body, and two first side portions respectively located on the left and right sides, and each of the first side portions has a first outer side surface facing a left-right direction, and a first outer side surface is concave and along The second socket unit includes a second insulative housing and a plurality of second terminals disposed on the second insulative housing, the second insulative housing having one of the second recesses a second body of the second terminal, and two second side portions respectively located on the left and right sides, and each of the second side portions has a second outer side surface facing the left and right direction, and a second outer side surface a second recess that is concave and extends in the front-rear direction, the second body is stacked above the first body, and the two second sides are at least partially behind the two first sides, respectively. And causing the second groove on the corresponding side to be in the front-rear direction with the first groove And a metal cover comprising a main cover body at least partially covering the second body, and two side cover bodies respectively located on the left and right sides, each side cover body having a connection to the main cover body and at least partially covering a first flat portion on the corresponding side and a flat portion on the second outer side, and a limit extending from the bottom end of the flat portion and extending into the first recess and the second recess on the corresponding side a position portion, and the limiting portion is floatable in an up and down direction in the corresponding first groove and the second groove. The electrical connector of claim 1, wherein the first socket unit further comprises two first fixing members respectively disposed on the bottom sides of the two first side portions, and the second socket unit further comprises two a second fixing member on the bottom side of the two second side portions. The electrical connector of claim 1, wherein the second insulative housing further has two cylindrical portions extending from the two second side portions and located in front of the first side portion on the corresponding side, each columnar The portion and the second side portion on the corresponding side define a recess portion to receive the first side portion on the corresponding side. The electrical connector of claim 3, wherein the first socket unit further comprises two first fixing members respectively disposed on the bottom sides of the two first side portions, and the second socket unit further comprises two a second fixing member on the bottom side of the two second side portions, and two third fixing members respectively disposed on the bottom sides of the two column portions. The electrical connector of claim 1, wherein the second socket unit further comprises two blocking members, and each of the second side rear sides of the second insulating housing defines a rear side extending in the up and down direction and accommodating one of the two a limiting slot of the blocking member, such that the blocking member spans the rear of the corresponding second recess in the up and down direction, thereby stopping the metal cover from moving backward, and the second insulating housing further has a An upper flange projecting upwardly and adjacent to the front side, the leading edge of the main cover abuts against the upper flange, thereby stopping the metal cover from moving forward. The electrical connector of claim 1, wherein the second socket unit further comprises two blocking members, and each of the second side rear sides of the second insulating housing defines a rear side extending in the up and down direction and accommodating one of the two a limiting slot of the blocking member, such that the blocking member straddles the corresponding rear side of the second groove in the up-and-down direction, thereby stopping the corresponding positional portion from moving backward, and the column on the corresponding side The portion stops the limit portion from moving forward. The electrical connector according to any one of claims 1 to 6, wherein each of the first grooves penetrates the corresponding first side portion in the front-rear direction, and each of the second grooves is in the front-rear direction Through the corresponding second side portion, the first groove on the corresponding side communicates with the second groove. The electrical connector of claim 7, wherein the main cover has a top plate portion above the second body and a rear plate portion extending rearwardly and downwardly from the top plate portion. The electrical connector of claim 8, wherein the rear plate portion has a plurality of vent holes. The electrical connector of claim 1, wherein the first body has a first base portion and a first abutting portion extending forwardly from the first base portion, the first butting portion having a socket facing forward a slot, the second body has a second base, and a second abutment extending forwardly from the second base, the second mating portion having a second slot with the socket facing forward. The electrical connector of claim 10, wherein the first body further has a plurality of first reinforcing ribs connected between the first base and the first abutting portion, the second body further having a plurality of connections a second reinforcing rib between the second base and the second abutting portion. The electrical connector of claim 11, wherein at least a portion of the first reinforcing ribs extend to a leading edge of the first abutting portion, at least a portion of the second reinforcing ribs extending to the second abutting portion The leading edge. The electrical connector of claim 1, wherein each of the first terminals has a first body segment fixed to the first body, an end connecting the first body segment and extending into the first slot a contact segment, and a first end segment connecting the first body segment and extending out of the first body, each second terminal has a second body segment fixed to the second body, a connection One end of the second body segment extends into the second contact portion of the second slot, and a second end portion of the second body segment is connected to the second body segment. The electrical connector of claim 13, wherein each of the second terminals is formed into a flat shape by punching a metal piece, and each of the second terminals further has a curved connection to the second body segment and the second An adjustment section between the tail sections, and the width of the adjustment section is smaller than the second body section and the second tail section for deformably adjusting the second tail section to be closer to or farther from the second body section. The electrical connector of claim 14 wherein each of the second tail segments has a downwardly facing arcuate contact surface for contacting a circuit board. The electrical connector of claim 15, wherein both ends of the adjustment section are gradually widened toward a width at a junction with the second body segment and the second tail segment, respectively. The electrical connector of claim 16, wherein the second tail section has a surface area greater than a surface area of the adjustment section. The electrical connector of claim 17, wherein the width of the adjustment segment is from 1 to 1.1 times the thickness of the second terminal plate body. The electrical connector of claim 1, wherein each of the first side portions further has a dovetail protrusion protruding rearward, and each of the second side portions further has a dovetail groove recessed to the rear to The dovetail-shaped bumps on the first side portion on the corresponding side are engaged in the up-and-down direction, and the first insulative housing and the second insulative housing are relatively fixed in the front-rear direction and the left-right direction. A terminal formed in a flat shape for punching a metal sheet, and having a main body section, a contact section connecting one end of the main body section, and a first tail section connecting the other end of the main body section; The terminal further has an adjustment section bently connected between the main body section and the tail section, and the adjustment section has a width smaller than the main body section and the tail section for deformably adjusting the tail section to be closer or Farther away from the main body segment. The terminal of claim 20, wherein the tail section has an arcuate contact surface for contacting a circuit board. The terminal of claim 20, wherein both ends of the adjustment section are gradually widened toward a width at a junction with the body section and the tail section, respectively. The terminal of claim 20, wherein the surface area of the tail section is greater than the surface area of the adjustment section. The terminal of claim 20, wherein the width of the adjustment segment is 1 to 1.1 times the thickness of the terminal plate body.