CN201374449Y - Electrical connector cam structure - Google Patents

Abstract

The utility model discloses an electrical connector, which comprises a base containing a plurality of conductive terminals, a cover movably assembled on the base, and a cam accommodated between the cover and the base. The cover and the base are respectively provided with a cover hole and a seat hole for accommodating the cam, and the relative displacement between the cover and the base is caused by the rotation of the cam. The first-order cylinder and the fourth-order cylinder, the diameter of the first-order cylinder is greater than the diameter of the other-order cylinder, the diameter of the second-order cylinder is less than or equal to the diameter of the third-order cylinder, and the cam structure design can be The operation torque required to rotate the cam is reduced, and the operation of the cam is facilitated.

Description

The cam of electric connector structure

[technical field]

The utility model relates to a kind of electric connector, refers in particular to a kind of chip module to be installed and connected in electric connector on the printed circuit board (PCB).

[background technology]

The electric connector relevant with the utility model generally include a tabular pedestal, be installed on conducting terminal in the pedestal, be assembled in the tabular lid on the pedestal and run through lid and the drive unit of pedestal, as the 92nd page of several electric connectors that disclosed of " Electronic Design " (" ELECTRONIC DESIGN ") of 7 Japan-US states distribution January in 2002.Lid is used to accept chip module, pedestal then with the circuit board winding, drive unit is a rotatable cam normally, utilizes the rotation of cam can drive lid and slides with respect to pedestal.For electric connector, because the spatial limitation demand is high, therefore the cam design in most of electric connectors becomes the column external form, to reduce required the taking up room of start.

The continuous diameter of one successively decreased successively about cam generally included single order, second order, three rank and quadravalence cylinder, wherein the single order cylinder is positioned at the lid upper outer, the second order cylinder is contained in the lid, three rank cylinders are contained in the pedestal, and protruding being exposed to outside the pedestal of quadravalence cylinder matched with fixture (as pad).Usually by instrument (as bottle opener) rotating cam, to promote pedestal and lid generation relative displacement.Therefore, the operation torsion that acts on the cam is more little, and then rotating cam will become easy more.Generally by reducing to act on the push-on force on the pin in the chip module or reducing coefficient of friction between described second order cylinder and the lid to reach the purpose that reduces operation torsion, yet, continuous increase along with pin number in the chip module, in assembling process, the push-on force that acts on the pin has increasing trend, be difficult to reduce this push-on force, and second order cylinder and lid be because the restriction of selection, reducing of the coefficient of friction between between the two also is quite limited.Therefore, along with the continuous increase of pin in the chip module, the required operation torsion of rotating cam has increasing trend, makes assembling process become complicated.

Therefore, be necessary to provide a kind of new cam of electric connector structure, to reduce the required operation torsion of rotating cam.

[utility model content]

The technical problems to be solved in the utility model is to provide a kind of electric connector that is provided with cam, and this cam can reduce the required operation torsion of rotating cam.

For solving the problems of the technologies described above, the utility model adopts following technical scheme: a kind of electric connector, it comprises the pedestal that contains plurality of conductive terminals, movably be mounted on the lid on the pedestal, and be contained in cam between lid and the pedestal, lid and pedestal are respectively equipped with the lid hole and the seat hole of accommodating cam, make between lid and the pedestal by cam rotation and to produce relative displacement, this cam comprises the first rank cylinder at least successively, the second rank cylinder, the 3rd rank cylinder and quadravalence cylinder, the diameter of the first rank cylinder is greater than the diameter of other rank cylinder, and the diameter of the described second rank cylinder is less than or equal to the diameter of the 3rd rank cylinder.

Compared to prior art, the utility model is by reducing the diameter of second order cylinder, and then can reduce the required operation torsion of rotating cam.

[description of drawings]

Fig. 1 is the stereogram of the utility model electric connector.

Fig. 2 is the exploded view of electric connector shown in Figure 1.

Fig. 3 is the stereogram of electric connector cam shown in Figure 1.

[embodiment]

Please refer to shown in Figure 1, electric connector 1 of the present utility model can electrically connect chip module (not shown) to printed circuit board (PCB) (not shown), it comprises the pedestal 2 that contains plurality of conductive terminals (not shown), movably be mounted on the lid 3 on the pedestal 2, and be contained in the cam 4 between lid 3 and the pedestal 2.

See also shown in Figure 2, pedestal 2 is made by insulating material, it comprises roughly rectangular flat matrix 21, and matrix 21 is provided with and somely runs through matrix 21 and be arranged terminal accommodation holes separated from one another (not label), and terminal accommodation holes is used to accommodate the conducting terminal of respective number.Pedestal 2 also comprises the carrier 22 that extend to be provided with by matrix 21 1 sides, runs through pedestal 2 carriers 22 at the middle position of pedestal 2 carriers 22 and is provided with roughly rounded seat hole 23, is used for accommodating the counterpart of cam 4.

Please refer to shown in Figure 3, cam 4 comprises that one from top to bottom links to each other and is the first rank cylinder 41, the second rank cylinder 42, the 3rd rank cylinder 43 and the quadravalence cylinder 44 of cylindrical configuration, wherein the diameter of the first rank cylinder 41 is greater than the diameter of other rank cylinder, the diameter of the second rank cylinder 42 is less than or equal to the diameter of the 3rd rank cylinder 43, and the diameter of quadravalence cylinder 44 is less than the diameter of the 3rd rank cylinder 43.In the present embodiment, the diameter of the second rank cylinder 42 is less than the diameter of the 3rd rank cylinder 43.The end face of the first rank cylinder 41 is concaved with the instrument accepting hole 411 that roughly is in-line, can be by instrument (as playing bottle opener etc.) rotating cam 4 by instrument accepting hole 411.The perisporium side one of the first rank cylinder 41 protrudes out block stop part 412, and the upper surface of this stop part 412 is concordant with the end face of the first rank cylinder 41.The first rank cylinder 41 and the second rank cylinder 42 are coaxial design, the 3rd rank cylinder 43 and quadravalence cylinder 44 are coaxial design, be provided with and be eccentric between the second rank cylinder 42 and the 3rd rank cylinder 43, i.e. the certain distance of column axis phase deviation of the axis of the first rank cylinder 41 and the second rank cylinder 42 and the 3rd rank cylinder 43 and quadravalence cylinder 44.The step A that contracts in forming between the second rank cylinder 42 and the 3rd rank cylinder 43, like this owing to the off-centre setting between the second rank cylinder 42 and the 3rd rank cylinder 43, rotating cam 4 makes pedestal 2 and lid 3 that certain relative displacement take place.

Lid 3 is used to carry the chip module of computer, it comprises matrix 21 shapes and the roughly the same base portion 31 of size with pedestal 2, base portion 31 is being provided with some through holes 32 with the corresponding position of the terminal accommodation holes of pedestal 2, is used to accommodate the conductive base pin (not shown) of chip module.Lid 3 base portions 31 both sides offer pick-up slots 36, are convenient to take out chip module.Lid 3 comprises also with the corresponding positions of the carrier 22 of pedestal 2 and extends the protuberance 33 that is provided with that protuberance 33 is slightly higher than base portion 31.Lid 3 protuberances 33 are provided with in the seat 23 corresponding positions, hole with pedestal 2 carriers 22 and cover hole 34.When lid 3 was installed on the pedestal 2, lid hole 34 connected mutually with seat hole 23, and cam 4 runs through these two holes and is contained in wherein.The lid hole 34 of lid 3 comprises top and lower part, top is made up of two different semicircles of diameter, be formed with block wall 35 perpendicular to lid 3 surfaces in the junction of two semicircles, the first rank cylinder 41 rotatably is contained in this upper strata, the lower part in lid hole 34 is made up of three parts, the semicircle of the second rank cylinder, 42 correspondences, the semicircle of the 3rd rank cylinder 43 correspondences, and the straightway that connects this two semicircle, the length of this straightway equals the eccentric throw of the second rank cylinder 42 and three rank cylinders 43, the second rank cylinder 42 rotatably is contained in this lower part, the 3rd rank cylinder rotatably is contained in the seat hole 23 on the pedestal 2, and hole 23, the quadravalence cylinder place of protruding out is used for matching with fixture.Protuberance 33 bottoms of lid 3 are provided with around the some conduits (not shown) that cover hole week side, these conduits are used to accommodate bonding jumper (not label), to prevent wearing and tearing lid 3 and pedestal 2 in the lid moving process, wherein a conduit is positioned on the tangent line of the described second rank cylinder, 42 determined semicircles.

When pedestal 2 and lid 3 fit together, rotation by driving cam 4 can make pedestal 2 and lid 3 be in two states: under first state, this electric connector 1 is in open mode, lid 3 is positioned at the top of pedestal 2, and being offset specific distance with respect to pedestal 2, the conductive base pin of chip module (not shown) is separated with the conducting terminal of electric connector 1; When chip module is placed the top of lid 3, utilize operation tool (as bottle opener) to force cam 4 to rotate a certain angle to block wall 35 places in lid hole 34, at this moment, by the promotion of cam 4 and lid 3 is moved with respect to pedestal 2, pedestal 2 and lid 3 offset distances are disappeared, electric connector 1 is in closed condition, makes that finally the conducting terminal in the conducting terminal accepting hole of conductive base pin and pedestal 2 of chip module contacts, and formation electrically conducts.

The operation torsion industry that acts on described cam 4 is calculated usually as follows: ActuationTorque=AF * [u * (E+B+C)+D], wherein AF represents the chip module push-on force; U represents the coefficient of friction between the second rank cylinder and lid; E, B represent the second rank cylinder/three rank cylinder radiuses respectively; C, D represent respectively be parallel to/perpendicular to the cam eccentric throw of lid 3 directions of advance.

The radius E of the second rank cylinder is greater than the diameter B of the 3rd rank cylinder in the prior art, the rotation of cam needs bigger operation torsion, can find out from the computing formula of described operation torsion, the operation torsion that acts on the cam 4 is directly proportional with the radius of second rank/three rank cylinders, therefore under the situation of ceteris paribus, the utility model is by dwindling the radius E of the second rank cylinder, make it be less than or equal to the radius B of the 3rd rank cylinder, reduce to be used for the used operation torsion of rotating cam, therefore made things convenient for the installation of chip module.

Claims (6)

1. An electrical connector, comprising a base containing a plurality of conductive terminals, a cover movably assembled on the base, and a cam accommodated between the cover and the base, the cover and the base A cover hole and a seat hole for accommodating the cam are respectively provided, and the relative displacement between the cover body and the base is generated by the rotation of the cam. The cam at least includes a first-stage cylinder, a second-stage cylinder, and a third-stage cylinder , the diameter of the first-order cylinder is greater than the diameter of the other-order cylinders, and there is a certain eccentric distance between the second-order cylinder and the third-order cylinder, and it is characterized in that: the diameter of the second-order cylinder is less than or Equal to the diameter of the third order cylinder. 2. The electrical connector according to claim 1, characterized in that: the first-stage cylinder and the second-stage cylinder are coaxially designed, and the third-stage cylinder and the fourth-stage cylinder are coaxially designed , the axes of the first and second order cylinders are offset by a specific distance from the axes of the third and fourth order cylinders. 3. The electrical connector according to claim 2, characterized in that: from the first-stage column to the fourth-stage column, a constriction is formed between the second-stage column and the third-stage column steps. 4. The electrical connector as claimed in claim 3, wherein the first-stage, second-stage, third-stage and fourth-stage columns are integrally formed. 5. The electrical connector according to claim 1, wherein the cover hole includes a semicircle corresponding to the second-order cylinder, a semicircle corresponding to the third-order cylinder, and a straight line connecting the two semicircles, the The length of the straight line segment is equal to the eccentricity of the second-order cylinder and the third-order cylinder. 6. The electrical connector according to claim 5, wherein the bottom of the cover is provided with several grooves surrounding the circumference of the cover hole, one of which is located in the semicircle corresponding to the second-order column on the tangent.

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