CN208923447U - Electric connector - Google Patents

Abstract

The utility model provides a kind of electric connector, it includes insulating body, several conductive terminals, snap close piece and shielding casing, the conductive terminal includes the first end subgroup and second end subgroup along short transverse in two rows of settings, insulating body includes main part, on front side of the main part and it is formed with the docking section of accommodating space, mounting portion on rear side of main part, described first, second end subgroup includes a pair of of ground terminal on the outermost side and a pair of power source terminals on the inside of ground terminal, wherein the signal terminal on the inside of the quantity with a pair of power source terminals in second end subgroup of the signal terminal on the inside of a pair of power source terminals in first end subgroup is in varying numbers, the back segment of the mounting portion is partly cut away to form scarce portion in the wherein side in short transverse, so that the mounting portion back segment is upper, electric connector is arrived in lower surface The distance of horizontal central plane differs.The insulating body of the utility model electric connector has reliable identification in directionality.

Description

Electric connector

Technical field

The utility model relates to a kind of electric connectors.

Background technique

With the rapid development of electronics industry science and technology, the volume of electronic product is even more along more and more frivolous, short and small Trend development, this also requires the spare part size of electronic product smaller and smaller, and connector industry be even more stand in the breach.

Due to requiring the smaller of USB Type-C connector of new generation, this leads to, production more preferable to mechanical property requirements Product design difficulty is higher.In order to towards more frivolous, more very thin equipment, and guarantee the reliability of product structure, major producer is confused Confusingly release corresponding structure design.

Existing USB Type-C pin connector arranges the quantity of conductive terminal due to the needs of application environment above and below It may be configured as difference, that is, two rows of conductive terminals are in asymmetric relative to the horizontal central plane of USB Type-C pin connector Formula structure, at this point, during automatic assembling, the directionality that insulating body needs to have certain, so as to be correctly oriented It is assembled with conductive terminal and shielding casing.

In view of this, it is necessary to existing electric connector be improved, to solve the above problems.

Utility model content

The purpose of this utility model is to provide it is a kind of can be improved it is when assembled can identification electric connector.

To realize above-mentioned purpose of utility model, the utility model provides a kind of electric connector, with insulating body, admittedly It is described due to several conductive terminals, snap close piece and the shielding casing being coated on outside the insulating body in the insulating body Conductive terminal includes the first end subgroup and second end subgroup along short transverse in two rows of settings, and the insulating body includes main body Portion on front side of the main part and is formed with the docking section of accommodating space, the mounting portion on rear side of the main part, described First, second terminal group includes a pair of of ground terminal on the outermost side and a pair of of power end on the inside of ground terminal Son, wherein a pair of of power supply in the quantity Yu second end subgroup of the signal terminal on the inside of a pair of power source terminals in first end subgroup The quantity of signal terminal on the inside of terminal is unequal, and the back segment of the mounting portion is partially cut in the wherein side in short transverse Except the portion of lacking is formed, so that the distance of horizontal central plane of the upper and lower surfaces of the mounting portion back segment to the electric connector not phase Deng.

As a further improvement of the utility model, the scarce portion extend forward from the rear end of the insulating body so that Its bottom surface is horizontally extending flat surface.

The scarce portion is formed in the roof of the mounting portion, the mounting portion as a further improvement of the utility model, Bottom wall center downwards projection be formed with convex block, the convex block is located at the rear end of the mounting portion, and the shielding casing includes Frame positioned at its front end and a pair of of extension for integrally being extended rearwardly to form from the rear end of the frame, at least within The rear end of one extension also has a notch being located therein in transverse direction, and the notch is from the rear end of shielding casing It is recessed forward, the convex block is limited in the notch.

The frame is sheathed on outside the main part and docking section as a further improvement of the utility model, described Extension adheres on the two sides of the mounting portion in the height direction respectively, and the rear surface of the extension is located at the insulation originally It is on front side of the rear end face of body or coplanar therewith.

The mounting portion, which has from its top, bottom wall, as a further improvement of the utility model, distinguishes projection outward Insertion section, the scarce portion extends forward so that the insertion section of mounting portion two sides has different length.

The mounting portion has the matrix for being located at front and being connected with main part as a further improvement of the utility model, And the limiting section expanded outward from the rear end of matrix.

As a further improvement of the utility model, in short transverse, the limiting section is upwardly or downwardly extended beyond Described matrix is to form blocking surface, and the limiting section extends downwardly the height beyond described matrix and extends downwardly with it beyond institute The height for stating matrix is unequal.

As a further improvement of the utility model, on front-rear direction, the length of the length of described matrix than limiting section It is long.

The shielding casing is gapless structure made of being drawn as a further improvement of the utility model, comprising Frame and the extension to extend back from the frame, the frame are sheathed on outside the main part and docking section, institute It states extension to be sheathed on the outside of the matrix of the mounting portion, the rear surface of the extension is connected to backward on front side of the limiting section The blocking surface.

As a further improvement of the utility model, in the wherein side in short transverse, the outer surface of the limiting section Distance to the horizontal central plane of electric connector is less than the outer surface of the extension to the horizontal central plane of the electric connector Distance, the other side in the height direction, the distance of the horizontal central plane of the outer surface of the limiting section to electric connector is not Less than the extension outer surface to the electric connector horizontal central plane distance.

The utility model has the beneficial effects that the portion of lacking is arranged by the back segment in insulating body in the utility model electric connector, Make its in directionality have reliably can identification, avoid anti-loaded.

Detailed description of the invention

Fig. 1 is the three-dimensional assembly diagram of the utility model electric connector first embodiment.

Fig. 2 is the view at another visual angle of electric connector shown in Fig. 1.

Fig. 3 is the stereogram exploded view of electric connector shown in Fig. 1.

Fig. 4 is the stereogram exploded view of the insulating body of electric connector shown in Fig. 3.

Fig. 5 is the view at another visual angle of insulating body of electric connector shown in Fig. 4.

Fig. 6 is the main view of electric connector shown in Fig. 1.

Fig. 7 is the rearview of electric connector shown in Fig. 1.

Fig. 8 is the side view after electric connector shown in Fig. 1 removes shielding casing.

Fig. 9 is the three-dimensional assembly diagram of the utility model electric connector second embodiment.

Figure 10 is the view at another visual angle of electric connector shown in Fig. 9.

Figure 11 is the rearview of electric connector shown in Fig. 9.

Figure 12 is the perspective view of the insulating body of electric connector shown in Figure 10.

Figure 13 is the side view after electric connector shown in Fig. 9 removes shielding casing.

Figure 14 is the schematic cross-sectional view of electric connector shown in Fig. 9.

Specific embodiment

The utility model is described in detail below with reference to embodiment shown in the drawings.But the embodiment is not Limit the utility model, structure that those skilled in the art are made according to the embodiment, method or functionally Transformation is all contained in the protection scope of the utility model.

It please join the first embodiment that Fig. 1 to Fig. 8 show the utility model electric connector 100, the electric connector 100 wraps It includes insulating body 1, several conductive terminals 2 being fixed in the insulating body 1, snap close piece 3 and is coated on the insulating body Shielding casing 4 outside 1.

It please join shown in Fig. 1 to Fig. 8, the docking that the insulating body 1 has main part 11, is set to 11 front of main part Portion 12 and it is located at 11 rear of main part and outwardly projecting mounting portion 13, wherein the main part 11 and docking section 12 are on the whole The setting of oval column, the inside of the docking section 12 are formed with the accommodating space 120 of forwards open setting, for patching Base connector is inserted into forward or backwards.

The roof and inside bottom wall of the insulating body 1 are respectively equipped with several terminal containing slots 10, the terminal containing slot 10 extend forwardly into 12 inside of docking section from the rear end face 130 of the insulating body 1 and are connected with accommodating space 120. In the present embodiment, the terminal containing slot 10 being arranged on the roof of the insulating body 1 and terminal containing slot corresponding on bottom wall 10 are connected along short transverse；In other embodiments, the terminal containing slot 10 on roof and terminal corresponding on bottom wall Can also be independent of one another along short transverse between container 10, namely be not connected to.

The docking section 12 has roof 121 and the bottom wall 122 that is oppositely arranged with the roof 121, the roof 121 and Bottom wall 122 is respectively provided with its perforative a pair of of slit 123 along short transverse, a pair of of slit 123 of roof 121 respectively with bottom A pair of of slit 123 on wall 122 is oppositely arranged and is aligned along short transverse, a pair of of the slit 123 being oppositely arranged along short transverse Constitute one group, the docking section 12 has two groups of slits 123 for being located at two sides in transverse direction, each group of slit 123 and its The corresponding terminal containing slot 10 in inside and rear is connected.

The mounting portion 13 have from its top, bottom wall be recessed inwardly setting accepting hole 1311 and from its top, bottom wall The insertion section 1312 of projection outward respectively, in the present embodiment, the top of the mounting portion 13, bottom wall are respectively provided with a pair of receipts Hold hole 1311 and a pair of insertion section 1312, and in transverse direction, the accepting hole 1311 is located at the insertion section 1312 inside.The center projection downwards of the bottom wall of the mounting portion 13 is formed with convex block 133, and the convex block 133 is located at described The rear end of mounting portion 13.

Meanwhile there is the mounting portion 13 oneself to be partly cut away forward to form scarce portion 1321 in end face 130 thereafter, the scarce portion 1321 are located at the mounting portion 13 in the wherein side in short transverse, and the scarce portion 1321 extends forward so that mounting portion 13 The insertion section 1312 of two sides has different length, in this way, so that the upper and lower surfaces of 13 back segment of the mounting portion are electrically connected described in The distance for connecing the horizontal central plane of device 100 differs, also, the scarce portion 1321 extends forward from the rear end face 130 so that its Bottom surface is horizontally extending flat surface.In the present embodiment, the scarce portion 1321 is placed in described with the convex block 133 Mounting portion 13 is in the two sides in short transverse.

Two sides in 1 transverse direction of insulating body are respectively equipped with fluting 14, a pair of fluting 14 respectively laterally to Outer opening, and the rear end face 130 of self-insulating ontology 1 extends forwardly into docking section 12, and in the two sides of docking section 12 and institute State 120 cross connection of accommodating space.

It please join shown in Fig. 2 to Fig. 3 and Fig. 6 to Fig. 8, the conductive terminal 2 includes the in two rows of settings along short transverse One terminal group 21 and second end subgroup 22, the first end subgroup 21 arrangement corresponding and reversed with second end subgroup 22.At this In embodiment, the first end subgroup 21 and second end subgroup 22 only illustrate a pair of of ground terminal 20a, a pair of of additional terminal 20b and a pair of power source terminals 20c, and the pair of ground terminal 20a is located at outermost, a pair of of additional terminal 20b is located at adjacent The inside of ground terminal 20a, power supply terminal 20c outside, signal terminal (not indicating) on the inside of power supply terminal 20c can be according to answering It is arranged with needing.

Each conductive terminal 2 has the elastic contact arm 201 for protruding into accommodating space 120, is fixed on insulating body 1 Terminal containing slot 10 in holding parts 202 and from the tail portion that holding parts 202 extend back 203, the contact arm 201 is in two Row is relatively arranged on the upper side and lower side of the accommodating space 120.

In the present embodiment, the contact arm 201 is protruded into upward or downward in accommodating space 120, and is had and be located at it The contact portion 2011 of free end, the contact portion 2011 is towards 201 projection of contact arm corresponding in another row, by a docking The tongue piece (not shown) of connector is held between the contact portion 2011.Meanwhile the terminal containing slot 10 and the conduction About 2011 contact portion of terminal 2 is corresponding, to provide the space that the contact portion 2011 of conductive terminal 2 floats outward, facilitates docking The grafting of connector.Position setting of the contact portion 2011 of first end subgroup 21 and second end subgroup 22 on insulating body 1 is equal It is installed with the docking site of respective terminal on the USB Type-C pin connector of standard identical.

In the present embodiment, ground terminal 20a, additional terminal 20b and the power supply terminal 20c in the first end subgroup 21 Holding parts 202 be integrally connected respectively with the holding parts 202 in second end subgroup 22 along the corresponding conductive terminal of short transverse, from And constitute disjunctor terminal.When assembling, the first, second terminal group 21,22 can be assembled into simultaneously in the insulating body 1, to assembling It brings great convenience.

It is independent of one another to constitute to be located at the signal terminal split settings on the inside of the power supply terminal 20c in two rows of terminal groups Conductive terminal.Also, in the utility model, first end subgroup 21 is different from the quantity of signal terminal in second end subgroup 22, So that the first, second terminal group 21,22 is arranged relative to the horizontal central plane of the electric connector 100 in asymmetric, at this In embodiment, it is provided with three signal terminal 20d in first end subgroup 21 between two power supply terminal 20c, described second The signal terminal 20d is provided between two power supply terminal 20c in terminal group 22.

When assembling, the first end subgroup 21 assembles pair for being fixed on insulating body 1 with second end subgroup 22 from back to front It answers in terminal containing slot 10, wherein the contact arm 201 of the additional terminal 20b and about 123 slit of the insulating body 1 are right It answers, to provide the space that contact arm 201 floats outward, facilitates the grafting of docking connector.

The ground terminal 20a and 201 front end of contact arm of power supply terminal 20c and signal terminal 20d are transversely concordant, and The front end of the contact arm 201 of additional terminal 20b protrudes out forward beyond the front end with other terminals in row's terminal group, namely The head of the additional terminal 20b extends forwardly beyond the head with other terminals in row, so that the institute of additional terminal 20b It states contact portion 2011 and is contacted with the earthing member that the hyoplastron rear portion of butt-joint socket connector (not shown) is arranged.The conductive terminal 2 The tail portion 203 extend back and exceed the insulating body 1 rear end face 130.

It please join Fig. 4 to Fig. 5 and combine shown in Fig. 7 and Fig. 8, the snap close piece 3 is metal material, and is located at along short transverse The center of the insulating body 1.In the present embodiment, the institute that the snap close piece 3 includes base portion 31, extends forward from base portion 31 It states lock catch arm 32 and (does not scheme from the rear end face 130 that base portion 31 extends backward more than insulating body 1 for being welded in circuit board Show) on leg 33 so that snap close piece 3 has both earthing effect.

The base portion 31 and lock catch arm 32 of the snap close piece 3 are bilateral symmetry, and the leg 33 is extended in the same direction and split In circuit board (not shown) in the two sides in short transverse.The base portion 31 is whole in horizontal positioned laminated structure, and including It extends transversely and fixed part 311 in a strip shape and a pair of of the projection 312 for being relatively arranged on 311 two sides of fixed part, institute It states projection 312 and projects the two sides for being formed in the fixed part 311 outward in transverse direction, with electrical with the shielding casing 4 Connection.

The lock catch arm 32 is extended in the same direction from 31 two sides of base portion in pairs, and is transversely set to the conducting end The outside of son 2, each lock catch arm 32 have the cantilever 321 connecting with the base portion 31 and are set to 321 end of cantilever Snap-lock projections 322, the opposite projection of snap-lock projections 322 on the lock catch arm 32 being arranged in pairs.

When the snap close piece 3 is assembled to from back to front in insulating body 1, the base portion 31 is fixed on the insulating body In 1 mounting portion 13, the lock catch arm 32 is inserted into from back to front in the corresponding fluting 14 of 1 two sides of insulating body, and its cantilever 321 Front is exposed in accommodating space 120 to carry out lock fixing with docking connector.The base portion 31 and lock catch arm 32 are vertically Direction is between the first, second terminal group 21,22, and the side surface 3120 of the projection 312 is in being located at institute in transverse direction State 1310 inside of lateral margin of mounting portion 13.

It please join Fig. 1 to Fig. 3 and combine shown in Fig. 6 to Fig. 7, the front end of the shielding casing 4 has the interface frame, mating frame of ellipse Mouthful, positive and negative insertion for butt-joint socket connector consistent with the interface frame, mating frame mouth of USB Type-C pin connector of standard Cooperation, with the applicable sexual clorminance easy to use of positive anti-plug.

The shielding casing 4 include positioned at the frame 41 of its front end and from the rear end of the frame 41 integrally backward A pair of of the extension 42 extended to form, the pair of extension 42 are relatively arranged on the frame 41 in two in short transverse Side, each extension 42 include the rake 421 that extension is tilted backwards from the upside of 41 rear end of frame or downside And continuing horizontal-extending horizontal part 422 backward from the rear end of rake 421, the rake 421 backward and is directed away from institute The direction for stating the horizontal central plane of electric connector 100 extends.

At least side (namely at least one horizontal part of the extension 42 thereon, in downside (namely top, bottom wall) On 422) be equipped at least protruding portion 423 formed towards its internal projection, in the present embodiment, the protruding portion 423 be to The elastic slice of lower bending in other embodiments can also be for from the inner surface of its roof and/or bottom wall to formation prominent inside it The convex structure such as fin, convex closure.The rear end of one of them extension 42 also has to be located therein in transverse direction Notch 424, the notch 424 is recessed forward from the rear end of shielding casing 4；It in other embodiments, can also be in masking shell The corresponding notch 424 is opened up on a pair of of extension 42 of body 4.

In the present embodiment, the shielding casing 4 is additionally provided with joint close 43 in the wherein side in short transverse, in addition, The roof and/or bottom wall of the shielding casing 4 are additionally provided with a pair of of slit 44, and this is located at the ipsilateral extension to slit 44 42 in transverse direction on two sides.

When assembling, the shielding casing 4 is sheathed on the outside of the insulating body 1 from front to back, wherein the frame 41 are sheathed on outside the main part 11 and docking section 12, and the convex block 133 is limited in the notch 422.The mounting portion 13 The insertion section 1312 of outside setting is inserted into from back to front and is contained in corresponding slit 44, and the extension 42 adheres on respectively The two sides of the mounting portion 13 in the height direction, and after the rear surface 420 of the extension 42 is located at the insulating body 1 130 front side or coplanar therewith of end face.The contact arm 201 of the additional terminal 20b to the earthing member on docking connector It is in contact, the elastic slice 421 of the shielding casing 4 is protruded into respectively inwards in the accepting hole 131 of the insulating body 1.

It please join the second embodiment that Fig. 9 to Figure 14 show the utility model electric connector 100 ', the electric connector 100 ' basic structure and assembled relation is identical as electric connector 100 in first embodiment comprising insulating body 1 ' is fixed In in the insulating body 1 ' several conductive terminals 2 ', snap close piece 3 ' and be coated on the shielding casing of the insulating body 1 ' outside 4'.The insulating body 1 ' also including main part 11 ', the docking section 12 ' being located on front side of the main part 11 ' and is located at main part Mounting portion 13 ' on rear side of in the of 11 ', with the electric connector 100 ' in first embodiment the difference is that:

The mounting portion 13 ' has the matrix 131 ' for being located at front and being connected with main part 11 ' and from after matrix 131 ' The limiting section 132 ' expanded outward is held, the limiting section 132 ' is located at the back segment of the mounting portion 13 ', further, Yu Qianhou On direction, the length of described matrix 131 ' is longer than the length of limiting section 132 '.The elliptical in its outer shape of the limiting section 132 ', Two sides in top surface, bottom surface and transverse direction are located at outside correspondence top surface, bottom surface and the two sides of described matrix 131 ' Side, so to form the circle blocking surface 1320 ' for being located at 131 ' periphery of described matrix in the front end face of the limiting section 132 '.Institute Stating matrix 131 ' has at least accepting hole 1311 ' for be recessed inwardly from its roof and/or bottom wall and being arranged.

In the present embodiment, in short transverse, the limiting section 132 ' upwardly or downwardly extends beyond described matrix 131, and the limiting section 132 ' is partly cut away to form scarce portion 1321 ' in the wherein side in short transverse.In other words, institute It states limiting section 132 ' and extends downwardly the height beyond described matrix 131 ' and extend downwardly the height beyond described matrix 131 ' with it It differs, namely forms the limiting section 132 that side is high, the other side is low.

The shielding casing 4 ' is gapless structure made of being drawn comprising frame 41 ' and from the frame 41 ' The extension 42 ' to extend back, in the present embodiment, the extension 42 ' are integrally to expand outwardly shape from frame 41 ' At expand structure, wherein the height of the extension 42 ' is big compared with the height of the frame 41 ', and the extension 42 ' is big in the distance expanded outwardly in transverse direction compared with it in the distance expanded outwardly in short transverse.

At least side of the extension 42 ' thereon, in downside (namely top, bottom wall) towards its internal projection formed to A few protruding portion 423 ', in the present embodiment, the protruding portion 423 ' is the elastic slice bent downward, in other embodiments, It can be for from convex structures such as fin from the inner surface of its roof and/or bottom wall to prominent formation inside it, convex closures.

The shielding casing 4 ' is sheathed on the outside of the insulating body 1 ' from front to back, wherein the frame 41 ' covers Outside set on the main part 11 ' and docking section 12 ', the extension 42 ' is sheathed on the matrix 131 ' of the mounting portion 13 ' outside Side, meanwhile, the protruding portion 423 ' is protruded into respectively inwards in the accepting hole 1311 ' of the insulating body 1 ', the extension 42 ' Rear surface 420 ' be connected to the blocking surface 1320 ' on front side of the limiting section 132 ' backward.Further, in short transverse On wherein side (upside as shown in figure 14), the horizontal centre of the outer surface of the limiting section 132 ' to electric connector 100 ' The distance in face be less than the extension 42 ' outer surface to the electric connector 100 ' horizontal central plane distance, highly The distance of the other side on direction, the horizontal central plane of the outer surface of the limiting section 132 ' to electric connector 100 ' is not less than institute State the outer surface of extension 42 ' to the electric connector 100 ' horizontal central plane distance.In this way, so that insulating body 1 ' has There is the relativity of both forward and reverse directions, facilitates identification of the product in automatic assembling to its direction, avoid anti-loaded.

Above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although referring to preferred embodiment pair The utility model is described in detail, those skilled in the art should understand that, it can be to the technology of the utility model Scheme is modified or replaced equivalently, without departing from the spirit and scope of the technical scheme of the present invention.

Claims (10)

1. a kind of electric connector, with insulating body, several conductive terminals being fixed in the insulating body, snap close piece and The shielding casing being coated on outside the insulating body, the conductive terminal include the first terminal along short transverse in two rows of settings Group and second end subgroup, the insulating body include main part, on front side of the main part and are formed with pair of accommodating space Socket part, the mounting portion on rear side of the main part, first, second terminal group include a pair of of ground connection on the outermost side Terminal and a pair of power source terminals on the inside of ground terminal, the wherein signal on the inside of a pair of power source terminals in first end subgroup The quantity of terminal and the quantity of the signal terminal on the inside of a pair of power source terminals in second end subgroup are unequal, it is characterised in that: The back segment of the mounting portion is partly cut away to form scarce portion in the wherein side in short transverse, so that the mounting portion back segment Upper and lower surfaces to the electric connector horizontal central plane distance it is unequal.

2. electric connector as described in claim 1, it is characterised in that: the scarce portion from the rear end of the insulating body forward Extend so that its bottom surface is horizontally extending flat surface.

3. electric connector as claimed in claim 2, it is characterised in that: the scarce portion is formed in the roof of the mounting portion, institute The center projection downwards for stating the bottom wall of mounting portion is formed with convex block, and the convex block is located at the rear end of the mounting portion, the masking Shell includes a pair of of the extension for being located at the frame of its front end and integrally extending rearwardly to form from the rear end of the frame, The rear end of extension described at least one of which also has the notch being located therein in transverse direction, and the notch covers shell certainly The rear end of body is recessed forward, and the convex block is limited in the notch.

4. electric connector as claimed in claim 3, it is characterised in that: the frame is sheathed on the main part and docking section Outside, the extension adheres on the two sides of the mounting portion in the height direction respectively, and the rear surface of the extension is located at institute It states on front side of the rear end face of insulating body or coplanar therewith.

5. electric connector as claimed in claim 4, it is characterised in that: the mounting portion has outside from its top, bottom wall difference The insertion section that pleurapophysis is stretched, the scarce portion extends forward so that the insertion section of mounting portion two sides has different length.

6. electric connector as claimed in claim 1 or 2, it is characterised in that: the mounting portion, which has, is located at front and and main body Limiting section portion connected matrix and expanded outward from the rear end of matrix.

7. electric connector as claimed in claim 6, it is characterised in that: in short transverse, the limiting section is upwardly or downwardly Described matrix is extended beyond to form blocking surface, and the limiting section extend downwardly height beyond described matrix and its to downward It is unequal to stretch the height beyond described matrix.

8. electric connector as claimed in claim 7, it is characterised in that: on front-rear direction, the length of described matrix is than limit The length in portion is long.

9. electric connector as claimed in claim 8, it is characterised in that: the shielding casing is gapless knot made of being drawn Structure comprising frame and the extension to extend back from the frame, the frame are sheathed on the main part and right Outside socket part, the extension is sheathed on the outside of the matrix of the mounting portion, and the rear surface of the extension is connected to described backward The blocking surface on front side of limiting section.

10. electric connector as claimed in claim 9, it is characterised in that: in the wherein side in short transverse, the limiting section Outer surface to electric connector horizontal central plane distance be less than the extension outer surface to the electric connector water The distance of flat median plane, the other side in the height direction, the horizontal central plane of the outer surface of the limiting section to electric connector Distance not less than the extension outer surface to the electric connector horizontal central plane distance.