Fisheye needle applied to welding-free terminal

Abstract

The utility model discloses a fisheye needle applied to a welding-free terminal, which comprises a functional area, and the fisheye needle is sequentially divided into a terminal strength area, a retention area, a transition area, an insertion area and a pre-insertion area by the functional area along the insertion direction of the fisheye needle; the surface of the fisheye needle is concaved to form the inner concave pits, the inner concave pits span the transition area and the insertion area, the two inner concave pits extend in opposite directions, and a central rib sheet is formed between the bottom surfaces of the two inner concave pits; the width of the fisheye needle is gradually reduced from the transition area to the retention area; the width of the fisheye needle is gradually reduced from the insertion area to the pre-insertion area; and the width of the central rib sheet is gradually reduced from the center to the two ends. According to the fisheye needle, the design that the two oppositely-sunken inner pits are separated by the central rib sheet is adopted, so that the fisheye needle has both hardness and elasticity.

Description

Technical Field

[0001] The utility model relates to the field of electronic terminals, in particular to a fisheye needle used for welding-free terminals. Background Art

[0002] Fisheye terminal crimping technology (also known as: Press-fit, fisheye PIN), this technology is an alternative solution to soldering installation. A connection formed by the elastic deformable pin or rigid pin matching the PCB metallized hole.

[0003] Fisheye terminals mainly use cold connection and solder-free method to achieve reliable connection of electrical contacts. When pressing the pin into the plug-in hole, the fisheye end produces elastic deformation and provides low contact impedance and high reliability of tight connection.

[0004] As attached Fig.12 As shown, it is an existing fisheye terminal, which has a typical "pointed ends and bulged middle" shape, is easy to insert and remove, and compresses the spring through the PCB hole to generate a holding force, and then connects the PCB board. It is suitable for assembly terminals, and its structural design is also suitable for processing using metal materials, but it is also limited by its own shape and material. It is not suitable for injection molding materials, and its molding direction is larger than the thickness direction. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a fisheye needle applied to a solder-free terminal, which utilizes a design in which a central rib separates two inner recesses that are recessed toward each other, so that the fisheye needle has both hardness and elasticity.

[0006] In order to solve the above problems, the utility model provides a fisheye needle applied to a solder-free terminal. In order to achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:

[0007] A fisheye needle used for a solder-free terminal comprises: a functional zone, which divides the fisheye needle into a terminal strength zone, a retention zone, a transition zone, an insertion zone and a pre-insertion zone in sequence along the insertion direction of the fisheye needle; an inner pit, the surface of the fisheye needle is sunken with an inner pit, the inner pit spans the transition zone and the insertion zone, the two inner pits extend in opposite directions, and a central rib sheet is formed between the bottom surfaces of the two inner pits; the width of the fisheye needle gradually narrows from the transition zone to the retention zone; the width of the fisheye needle gradually narrows from the insertion zone to the pre-insertion zone; and the width of the central rib sheet also gradually narrows from the center to both ends.

[0008] The beneficial effects of adopting the above technical solution are: the pre-insertion area is responsible for guiding the entire fisheye needle into the PCB hole of the PCB board; the insertion area is responsible for generating the elastic force of the first wave peak; the transition area is responsible for connecting the insertion area and the retention force area to ensure smooth insertion; the retention force area is responsible for generating the elastic force of the second wave peak and the retention force; the terminal strength area provides strength for the fisheye needle as a whole to prevent buckling during insertion.

[0009] Each section of the fisheye needle along a single direction plays a different role. It has good contact stability, simple structure, easy insertion and removal, and its shape is also suitable for assembly type and embedded injection molding terminals, improving the disadvantage of not being suitable for embedded injection molding.

[0010] Secondly, the two concave pits facing each other are equivalent to digging out the material of the fisheye needle here, making the fisheye needle more elastic and flexible. The thicker parts of the transition zone and the insertion zone outside the inner pits are equivalent to the elastic arms that work. In terms of shape, this pair of elastic arms is also equivalent to the "eyelids" of the "fisheye".

[0011] Finally, the center rib piece is equivalent to ensuring the solid structure of the center of the fisheye needle. The solid fisheye needle terminal can enhance the insertion force and holding force. The center rib piece is equivalent to controlling the physical properties of the fisheye needle so that it is not too soft and elastic.

[0012] As a further improvement of the utility model, the outer wall of the fisheye needle includes a pair of spindle-shaped planes parallel to each other, the opening of the inner pit is located on the spindle-shaped planes, the outer wall of the fisheye needle also includes a pair of side curved surfaces arranged in mirror symmetry with each other, the spindle-shaped planes and the side curved surfaces are tangently transitioned through a longitudinal outer fillet, and the widths of each part of the longitudinal outer fillet itself are equal.

[0013] The beneficial effect of adopting the above technical solution is that the thickness and thinness of each part of the fisheye needle are determined by measuring the concave-convex relationship between the curved surfaces. From one angle, the fisheye needle is a "fisheye" shape with a thick center and pointed ends. From a 90° angle, the fisheye needle is a product of equal thickness. This facilitates the elastic deformation of the fisheye needle.

[0014] As a further improvement of the utility model, a plurality of pits are recessed on the spindle-shaped plane.

[0015] The beneficial effect of adopting the above technical solution is that the pitting pits not only increase the friction factor, but more importantly, the pitting pits produced by hot pressing are convenient for enhancing the structural strength at this location.

[0016] As a further improvement of the utility model, the contour of the inner pit is an olive shape with rounded corners at both ends, and both sides of the inner pit are respectively provided with a pitting band, and each pitting band is composed of a row of arranged pitting pits.

[0017] The beneficial effect of adopting the above technical solution is that the contour shape of the inner pit is consistent with the shapes of the transition zone and the insertion zone, thereby ensuring the elastic performance of the fisheye needle.

[0018] As a further improvement of the utility model, the spindle-shaped plane forms strip areas of equal width on both sides of the inner pit, and the pitting belt is located on the strip area.

[0019] As a further improvement of the utility model, the surfaces of the holding force zone and the transition zone are recessed with serrated stripes, and the serrated stripes are also recessed on the side curved surface and the longitudinal outer fillet, and the length direction of each serrated stripe is perpendicular to the length direction of the fisheye needle.

[0020] The beneficial effect of adopting the above technical solution is that the added serrated stripes are also for increasing the elastic bending performance here, so that the fisheye needle can adaptively undergo a certain elastic skew swing during the plugging and unplugging operation.

[0021] As a further improvement of the present invention, the junction between the retention zone and the terminal strength zone is provided with an inner fillet zone, and the width of the terminal strength zone is greater than the width of the junction between the transition zone and the insertion zone.

[0022] The beneficial effect of adopting the above technical solution is that the fillet area avoids stress concentration there.

[0023] As a further improvement of the present invention, the fisheye needle can be assembled with the PCB hole, and the sum of the lengths of the transition zone and the insertion zone is greater than the axial length of the PCB hole; when the fisheye needle is assembled with the PCB hole, the pre-insertion zone is exposed from the PCB hole and constitutes an exposed end; when the fisheye needle is not subjected to lateral pressure, the width of the junction between the transition zone and the insertion zone is greater than the inner diameter of the PCB hole, and the widths of the retention force zone and the pre-insertion zone are both smaller than the inner diameter of the PCB hole.

[0024] The beneficial effect of adopting the above technical solution is that the matching size of the fisheye needle and the PCB board can be adjusted according to the size of the PCB hole. The width of the junction between the transition zone and the insertion zone ensures that it will have elastic deformation when inserted into the PCB hole.

[0025] As a further improvement of the utility model, along the insertion direction of the fisheye needle, the pre-insertion area includes an equal-thick section and a sharp section in sequence; the end of the fisheye needle away from the terminal strength zone is a flat end, the outline of the flat end is a rounded rectangle, the outer wall of the sharp section also includes an isosceles trapezoidal surface, and the outer wall of the sharp section is composed of a circle of alternately spaced isosceles trapezoidal surfaces and longitudinal outer rounded corners.

[0026] The beneficial effect of adopting the above technical solution is that the equal-thick section and the sharp section take into account the structural strength and guiding function of the pre-insertion area. The flat end, the isosceles trapezoidal surface, and the longitudinal outer rounded corners are equivalent to forming a rounded prism of the sharp section, taking into account the sharpness, structural strength and angle positioning of the sharp section.

[0027] As a further improvement of the utility model, the terminal strength zone, the retention zone, the transition zone, the insertion zone and the pre-insertion zone of the fisheye pin are made of an integrated plastic material.

[0028] The beneficial effect of adopting the above technical solution is that compared with the metal terminal in the prior art, the structural shape of the present invention takes into account the possibility of one-piece injection molding, so that the fisheye needle as an injection molded part can maximize its strengths and minimize its weaknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a front view of an implementation method of the utility model;

[0031] Figure 2 It is a three-dimensional diagram of an embodiment of the utility model;

[0032] Figure 3 It is a partial enlarged view of point A of one embodiment of the utility model;

[0033] Figure 4 It is a partial enlarged view of position B of an implementation mode of the utility model;

[0034] Figure 5 This is a front view of an implementation method of the utility model;

[0035] Figure 6 It is a side view of an embodiment of the utility model;

[0036] Figure 7 It is a CC cross-sectional view of an embodiment of the utility model;

[0037] Figure 8 It is a DD cross-sectional view of an embodiment of the utility model;

[0038] Fig. 9 It is an EE cross-sectional view of an embodiment of the utility model;

[0039] Fig.10 It is an application schematic diagram of an implementation mode of the utility model;

[0040] Fig.11 It is an application schematic diagram of an implementation mode of the utility model;

[0041] Fig.12 It is a structural schematic diagram of an implementation method of the prior art.

[0042] 1-terminal strength area; 2-retention force area; 3-transition area; 4-insertion area; 5-pre-insertion area; 501-uniform thickness section; 502-sharp section; 6-flat end; 7-pitting pit; 9-center rib; 10-inner concave pit; 11-serrated stripes; 12-inner fillet area; 13-longitudinal outer fillet; 14-side curved surface; 15-isosceles trapezoidal surface; 16-spindle-shaped plane; 20-PCB hole; 21-exposed end. DETAILED DESCRIPTION

[0043] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0044] In order to achieve the purpose of the utility model, a fisheye needle used for a solder-free terminal comprises: a functional area, along the insertion direction of the fisheye needle, such as Figure 1 As shown, the functional areas divide the fisheye needle into terminal strength area 1, retention area 2, transition area 3, insertion area 4, and pre-insertion area 5 in sequence; the inner pit 10, the surface of the fisheye needle is sunken with the inner pit 10, the inner pit 10 spans the transition area 3 and the insertion area 4, and the two inner pits 10 extend in opposite directions, as shown in FIG. Fig. 9 As shown, a central rib sheet 9 is formed between the bottom surfaces of the two inner pits 10; the width of the fisheye needle gradually narrows from the transition zone to the retention zone; the width of the fisheye needle gradually narrows from the insertion zone 4 to the pre-insertion zone 5; the width of the central rib sheet 9 also gradually narrows from the center to the two ends.

[0045] The beneficial effects of adopting the above technical solution are: the pre-insertion area is responsible for guiding the entire fisheye needle into the PCB hole of the PCB board; the insertion area is responsible for generating the elastic force of the first wave crest; the transition area is responsible for connecting the insertion area and the retention area to make the insertion smooth; the retention area is responsible for generating the elastic force and retention force of the second wave crest; the terminal strength area provides strength for the fisheye needle as a whole to prevent buckling during insertion. The fisheye needle plays different roles in each section along a single direction. It has good contact stability, simple structure, easy insertion and removal, and its shape is also suitable for assembly type and embedded injection molding terminals, improving the disadvantages of being unsuitable for embedded injection molding. Secondly, the two concave pits facing each other are equivalent to digging out the material of the fisheye needle here, making the fisheye needle more elastic and flexible. The thicker parts of the transition zone and the insertion zone outside the inner pit are equivalent to the elastic arms that work. In terms of shape, this pair of elastic arms is also equivalent to the "eyelids" of the "fisheye". Finally, the center rib piece is equivalent to ensuring the solid structure of the center of the fisheye needle. The solid fisheye needle terminal can enhance the insertion force and holding force. The center rib piece is equivalent to controlling the physical properties of the fisheye needle so that it is not too soft and elastic.

[0046] In other embodiments of the present invention, the outer wall of the fisheye needle includes a pair of mutually parallel spindle-shaped planes 16, the opening of the inner pit 10 is located on the spindle-shaped planes 16, and the outer wall of the fisheye needle also includes a pair of side curved surfaces 14 arranged in mirror symmetry with each other. Figure 2 As shown, the spindle-shaped plane 16 and the side curved surface 14 are tangentially transitioned through the longitudinal outer fillet 13, and the widths of each part of the longitudinal outer fillet 13 are equal.

[0047] The beneficial effect of adopting the above technical solution is that the thickness and thinness of each part of the fisheye needle are determined by measuring the concave-convex relationship between the curved surfaces. From one angle, the fisheye needle is a "fisheye" shape with a thick center and pointed ends. From a 90° angle, the fisheye needle is a product of equal thickness. This facilitates the elastic deformation of the fisheye needle.

[0048] In some other embodiments of the present invention, a plurality of pits 7 are recessed on the spindle-shaped plane 16 .

[0049] The beneficial effect of adopting the above technical solution is that the pitting pits not only increase the friction factor, but more importantly, the pitting pits produced by hot pressing are convenient for enhancing the structural strength at this location.

[0050] In some other embodiments of the present invention, the contour of the inner pit 10 is an olive shape with rounded corners at both ends, and each side of the inner pit 10 is provided with a pitting band, and each pitting band is composed of a row of pitted pits 7.

[0051] The beneficial effect of adopting the above technical solution is that the contour shape of the inner pit is consistent with the shapes of the transition zone and the insertion zone, thereby ensuring the elastic performance of the fisheye needle.

[0052] In other embodiments of the present invention, the spindle-shaped plane 16 forms strip areas of equal width on both sides of the inner pit 10, and the pitted belt is located on the strip area.

[0053] In other embodiments of the present invention, Figure 3 As shown, the surfaces of the holding force zone 2 and the transition zone 3 are recessed with sawtooth stripes 11, and the sawtooth stripes 11 are also recessed on the side curved surface 14 and the longitudinal outer fillet 13, and the length direction of each sawtooth stripe 11 is perpendicular to the length direction of the fisheye needle.

[0054] The beneficial effect of adopting the above technical solution is that the added serrated stripes are also for increasing the elastic bending performance here, so that the fisheye needle can adaptively undergo a certain elastic skew swing during the plugging and unplugging operation.

[0055] In other embodiments of the present invention, the junction between the retention zone 2 and the terminal strength zone 1 is provided with an inner fillet zone 12 , and the width of the terminal strength zone 1 is greater than the width of the junction between the transition zone 3 and the insertion zone 4 .

[0056] The beneficial effect of adopting the above technical solution is that the fillet area avoids stress concentration there.

[0057] In other embodiments of the present invention, Fig.10 , Fig.11 As shown, the fisheye needle can be assembled with the PCB hole 20, and the sum of the lengths of the transition area 3 and the insertion area 4 is greater than the axial length of the PCB hole 20; Fig.11 As shown, when the fisheye needle is assembled with the PCB hole 20, the pre-insertion area 5 is exposed from the PCB hole 20 and forms an exposed end 21; when the fisheye needle is not subjected to lateral pressure, the width of the junction between the transition area 3 and the insertion area 4 is greater than the inner diameter of the PCB hole 20, and the widths of the retention area 2 and the pre-insertion area 5 are both smaller than the inner diameter of the PCB hole 20.

[0058] When the fisheye needle is inserted into the PCB hole 20, the width of the inner pit 10 will also be elastically narrowed.

[0059] The beneficial effect of adopting the above technical solution is that the matching size of the fisheye needle and the PCB board can be adjusted according to the size of the PCB hole. The width of the junction between the transition zone and the insertion zone ensures that it will have elastic deformation when inserted into the PCB hole.

[0060] In other embodiments of the present invention, along the direction of insertion of the fisheye needle, such as Figure 1 As shown, the pre-insertion area 5 includes an equal-thick section 501 and a sharp section 502 in sequence; the end of the fisheye needle away from the terminal strength area 1 is a flat end 6, and the outline of the flat end 6 is a rounded rectangle. Figure 4 As shown, the outer wall of the sharp section 502 also includes an isosceles trapezoidal surface 15 , and the outer wall of the sharp section 502 is composed of a circle of alternately spaced isosceles trapezoidal surfaces 15 and longitudinal outer rounded corners 13 .

[0061] The beneficial effect of adopting the above technical solution is that the equal-thick section and the sharp section take into account the structural strength and guiding function of the pre-insertion area. The flat end, the isosceles trapezoidal surface, and the longitudinal outer rounded corners are equivalent to forming a rounded prism of the sharp section, taking into account the sharpness, structural strength and angle positioning of the sharp section.

[0062] In other embodiments of the present invention, the terminal strength zone 1, the retention zone 2, the transition zone 3, the insertion zone 4, and the pre-insertion zone 5 of the fisheye needle are made of an integrated plastic material.

[0063] The beneficial effect of adopting the above technical solution is that compared with the metal terminal in the prior art, the structural shape of the present invention takes into account the possibility of one-piece injection molding, so that the fisheye needle as an injection molded part can maximize its strengths and minimize its weaknesses.

[0064] like Figure 7 As shown, the thickness of the central rib 9 is greater than the depth of each inner recess 10 .

[0065] The material thickness T of the fisheye needle is 0.25mm to 0.80mm.

[0066] Each pit 7 is a hemispherical cavity.

[0067] The two spindle-shaped planes 16 are flattened on both sides to increase the shaping ability of the fisheye needle, thereby improving the holding force.

[0068] Fig.10 This is a state diagram before assembly with PCB hole 20. Fig.11 This is a state diagram after the assembly with the PCB hole 20 has been completed.

[0069] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A fisheye needle for a solder-free terminal, characterized in that: include: Functional areas, along the insertion direction of the fisheye needle, the functional areas sequentially divide the fisheye needle into a terminal strength area, a retention area, a transition area, an insertion area, and a pre-insertion area; An inner pit, wherein the surface of the fish-eye needle is sunken with an inner pit, the inner pit spans the transition zone and the insertion zone, the two inner pits extend in opposite directions, and a central rib sheet is formed between the bottom surfaces of the two inner pits; The width of the fisheye needle gradually narrows from the transition zone to the holding force zone; the width of the fisheye needle gradually narrows from the insertion zone to the pre-insertion zone; and the width of the central rib sheet also gradually narrows from the center to both ends.

2. The fisheye pin for solder-free terminal according to claim 1, characterized in that: The outer wall of the fisheye needle includes a pair of spindle-shaped planes parallel to each other, and the opening of the inner pit is located on the spindle-shaped planes; the outer wall of the fisheye needle also includes a pair of side curved surfaces arranged in mirror symmetry with each other, and the spindle-shaped planes and the side curved surfaces are tangently transitioned through longitudinal outer fillets, and the widths of each part of the longitudinal outer fillet itself are equal.

3. The fisheye pin for solder-free terminal according to claim 2, characterized in that: A plurality of pits are recessed on the spindle-shaped plane.

4. The fisheye needle for solder-free terminal according to claim 3, characterized in that: The inner concave pit has an olive shape with rounded corners at both ends, and each of the two sides of the inner concave pit is provided with a pitting belt, and each pitting belt is composed of a row of arranged pitting pits.

5. The fisheye needle for solder-free terminal according to claim 4, characterized in that: The spindle-shaped plane forms strip areas of equal width on both sides of the inner pit, and the pitted belt is located on the strip area.

6. The fisheye needle for solder-free terminal according to claim 2, characterized in that: The surfaces of the holding force zone and the transition zone are recessed with sawtooth stripes, and the sawtooth stripes are also recessed on the side curved surface and the longitudinal outer rounded corners. The length direction of each sawtooth stripe is perpendicular to the length direction of the fisheye needle.

7. The fisheye pin for solder-free terminal according to claim 1, characterized in that: The junction of the retention zone and the terminal strength zone is provided with an inner fillet zone, and the width of the terminal strength zone is greater than the width of the junction of the transition zone and the insertion zone.

8. The fisheye pin for solder-free terminal according to claim 1, characterized in that: The fisheye needle can be assembled with a PCB hole, and the sum of the lengths of the transition zone and the insertion zone is greater than the axial length of the PCB hole; when the fisheye needle is assembled with the PCB hole, the pre-insertion zone is exposed from the PCB hole and constitutes an exposed end; when the fisheye needle is not subjected to lateral pressure, the width of the junction between the transition zone and the insertion zone is greater than the inner diameter of the PCB hole, and the widths of the retention force zone and the pre-insertion zone are both smaller than the inner diameter of the PCB hole.

9. The fisheye needle for solder-free terminal according to claim 2, characterized in that: Along the insertion direction of the fisheye needle, the pre-insertion area includes an equal-thick section and a sharp section in sequence; the end of the fisheye needle away from the terminal strength zone is a flat end, the outline of the flat end is a rounded rectangle, the outer wall of the sharp section also includes an isosceles trapezoidal surface, and the outer wall of the sharp section is composed of a circle of alternately spaced isosceles trapezoidal surfaces and longitudinal outer rounded corners.

10. The fisheye pin for solder-free terminal according to claim 1, characterized in that: The terminal strength zone, retention zone, transition zone, insertion zone and pre-insertion zone of the fisheye needle are made of an integrated plastic material.

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