Bidirectional low-insertion-force type square pin terminal and through-cylinder connector

Abstract

The utility model relates to a bidirectional low insertion force type square pin terminal and a cylinder penetrating connector. The utility model relates to a bidirectional low insertion force type square pin terminal, comprising a terminal body; the at least one group of clamping point structures are arranged on one outer wall surface of the terminal body; the clamping point structure comprises a first clamping point and a second clamping point which are arranged at an interval along the length direction of the terminal body; the ends, close to each other, of the first clamping point and the second clamping point protrude out of the outer wall face, and the ends, away from each other, of the first clamping point and the second clamping point are connected to the outer wall face in an extending mode. According to the square pin terminal provided by the utility model, the clamping point structure capable of guiding in two directions is arranged, so that the square pin terminal can be inserted into the connector main body from any end part with low insertion force; the square pin terminal has a stable holding force with a connector main body, is applied to a cylinder-penetrating connector, can effectively maintain the stability and sealing performance of the connector, and can improve the production efficiency at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of connectors, in particular to a bidirectional low-insertion-force four-pin terminal and a through-cylinder connector. Background Art

[0002] As a widely used connector terminal, the four-pin terminal is usually used in the field of automotive connectors, such as through-cylinder connectors. The four-pin terminal is usually made of pure copper. By forced extrusion in a mold, a sharp corner or a raised barb is formed in the middle position; or the barb is formed by punching and tearing in the middle of the terminal. The barb can then interfere with the plastic to form a stable holding force to prevent the terminal from falling off. However, in order to facilitate the insertion of the four-pin terminal into the plastic housing, the barbs of the existing four-pin terminal are usually in a single direction. So when inserting the four-pin terminal into the plastic, it is necessary to select the insertion direction, which causes inconvenience in production. If it is inserted in reverse, it is easy to cause the four-pin terminal to not fit tightly with the plastic, resulting in the loosening of the four-pin terminal, which will not only affect the electrical connection performance of the through-cylinder connector, but also affect the sealing performance of the through-cylinder connector. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide a bidirectional low-insertion-force four-pin terminal. By setting a bidirectionally guided card point structure, the four-pin terminal can be inserted into the connector body from either end with low insertion force, thereby simplifying the assembly process. At the same time, a spacing space is provided in the middle of the card point structure for accommodating interference rubber, so that a stable holding force can be maintained with the connector body.

[0004] Another object of the present invention is to provide a through-cylinder connector that can effectively maintain the stability and sealing performance of the connector by providing a bidirectional low insertion force four-pin terminal, while also improving production efficiency.

[0005] A bidirectional low insertion force square pin terminal comprising:

[0006] terminal body;

[0007] At least one set of latching point structures provided on an outer wall surface of the terminal body;

[0008] The card point structure includes a first card point and a second card point spaced apart along the length direction of the terminal body; the ends of the first card point and the second card point that are close to each other protrude from the outer wall surface of the terminal body, and the ends of the first card point and the second card point that are away from each other extend and are connected to the outer wall surface of the terminal body.

[0009] Furthermore, the first clamping point and the second clamping point are arranged at a first angle, and the first angle is 0-180°.

[0010] Furthermore, the first clamping point and the second clamping point are symmetrically arranged relative to a cross section in the width direction of the terminal body.

[0011] Furthermore, the said card point structure further comprises a third card point and a fourth card point;

[0012] The third clamping point is spaced apart from the first clamping point in the width direction of the outer wall surface, the first clamping point and the third clamping point are close to each other at their ends close to the second clamping point, and the first clamping point and the third clamping point are both arranged at a certain angle to the terminal body to form a first accommodation gap close to the middle of the outer wall surface of the terminal body;

[0013] The fourth clamping point and the second clamping point are spaced apart in the width direction of the outer wall, the second clamping point and the fourth clamping point are close to each other at one end close to the first clamping point, and the third clamping point and the fourth clamping point are both set at a certain angle to the terminal body to form a second accommodating gap close to the middle of the outer wall of the terminal body.

[0014] Furthermore, the third clamping point and the first clamping point are symmetrically arranged in the width direction of the outer wall surface, and a second angle is formed between the third clamping point and the first clamping point; the fourth clamping point and the second clamping point are symmetrically arranged in the width direction of the outer wall surface.

[0015] Furthermore, the first angle is greater than or equal to the second angle.

[0016] Furthermore, the first clamping point includes a first connection surface gradually away from the outer wall surface of the terminal body, and the second clamping point includes a second connection surface gradually away from the outer wall surface; the first connection surface and the second connection surface are arc surfaces or plane surfaces.

[0017] Preferably, the number of the clamping point structures is two groups, which are symmetrically arranged on two opposite outer wall surfaces of the terminal body.

[0018] Furthermore, the terminal body further includes introduction portions respectively provided at both ends in the length direction thereof.

[0019] A cylinder connector, comprising:

[0020] A connector body and the four-pin terminals;

[0021] The connector body is provided with a fixed part, a first plug-in part and a second plug-in part; the first plug-in part and the second plug-in part are respectively provided at both ends of the fixed part; the four-pin terminal can be inserted into the connector body via the first plug-in part or the second plug-in part; the card point structure is carded to the fixed part.

[0022] The beneficial effects of the present invention are:

[0023] (1) By providing a bidirectionally guided card point structure, the square pin terminal can be inserted into the connector body from either end with low insertion force and can maintain a stable retention force with the connector body;

[0024] (2) A space is provided between two clamping points in the length direction to accommodate the connector main body material that has been squeezed and deformed. When the four-pin terminal stops sliding, the material that has been squeezed and deformed recovers and is clamped into the space, thereby providing resistance to the withdrawal of the four-pin terminal and improving its stability.

[0025] (3) The terminal wire is drawn through an eye die into a terminal body with a certain width and thickness by a wire drawing process, and then the lead-in parts and the card point structure at both ends of the terminal body are formed by stamping, which can save mold costs and equipment costs;

[0026] (4) The four-pin terminals are independently clamped by the material strip, and the head or tail does not need to be connected, which can avoid the risk of exposed copper at the end;

[0027] (5) By applying bidirectional low insertion force square pin terminals to through-cylinder connectors, the stability and sealing performance of through-cylinder connectors can be effectively maintained while improving production efficiency.

[0028] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 An implementation of the four-pin terminal provided in the embodiment of the present application;

[0030] Figure 2 Another embodiment of the four-pin terminal provided in the embodiment of the present application;

[0031] Figure 3 for Figure 2 A partial enlarged view of

[0032] Figure 4 for Figure 2 Front view of the square pin terminal;

[0033] Figure 5 This is a packaging diagram for the four-pin terminal;

[0034] Figure 6 A schematic structural diagram of a cylinder-penetrating connector provided in an embodiment of the present application;

[0035] Figure 7 It is a cross-sectional view of the cylinder connector;

[0036] Figure 8 for Figure 7 A partial enlarged view of .

[0037] In the figure: 10-square pin terminal; 11-terminal body; 111-first introduction part; 112-second introduction part; 113-outer wall surface; 12-card point structure; 121-first card point; 1211-first connection surface; 122-second card point; 1221-second connection surface; 123-third card point; 124-fourth card point; 125-interval; 126-first accommodating gap; 127-second accommodating gap; 20-connector body; 21-first plug-in part; 211-first slot; 212-elastic arm buckle; 213-first notch; 214-second buckle structure; 215-sealing groove; 22-second plug-in part; 221-second slot; 222-positioning rib; 223-third buckle structure; 23-fixing part; 24-sealing part; 241-annular groove; 242-sealing member; 30-material strip. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In the description of this utility model, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, direct connections, connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] See also Figure 1-5The embodiment of the present application provides a bidirectional low insertion force four-pin terminal, including: a terminal body 11 and a clamping point structure 12 provided on at least one outer wall surface 113 of the terminal body 11; the clamping point structure 12 includes a first clamping point 121 and a second clamping point 122 spaced apart along the length direction of the terminal body 11; the end of the first clamping point 121 and the second clamping point 122 close to each other protrudes from the outer wall surface 113, and the end of the first clamping point 121 and the second clamping point 122 away from each other is extended and connected to the outer wall surface 113.

[0042] The four-pin terminal 10 provided in the embodiment of the present application can be inserted from both ends of the four-pin terminal 10 when assembled with the connector body. During the insertion process, the end of the first clamping point 121 or the second clamping point 122 that is extended and connected to the outer wall surface 113 first interferes with the connector body and squeezes the interfering portion, and then serves as a guide to insert the entire four-pin terminal 10 into the connector body. This arrangement allows the four-pin terminal 10 to be inserted into the connector body more smoothly, reducing the insertion force during the assembly of the four-pin terminal 10. After assembly is completed, the first clamping point 121 and the second clamping point 122 squeeze the rubber material of the connector body into the gap 125 between the first clamping point 121 and the second clamping point 122, and the deformation is restored. Therefore, the first clamping point 121 and the second clamping point 122 can respectively provide resistance to the four-pin terminal 10 in its length direction, play a role in preventing retreat, and improve the assembly stability of the four-pin terminal 10.

[0043] See also Figure 2 and Figure 5 Furthermore, the terminal body 11 also includes guides arranged along its length. These guides are chamfered to serve as guides, facilitating the smooth insertion of the square-shaped terminal 10 into the connector body. In this embodiment, the terminal body 11 is formed by drawing the terminal wire through an eye die into a square shape of a certain width and thickness. The guides and the latching structures 12 at both ends of the terminal body 11 are then formed by punching or stamping a die. The square-shaped terminal 10 is then independently clipped together using a material strip 30. It is understood that the material strip 30 is made of thin material, making it easier to cut during subsequent assembly. Compared to traditional square-shaped terminal 10 that is connected through a head or tail, the terminal body 11 formed through a wire drawing process in the present embodiment of the present invention is simple to manufacture, occupies a small space, and has low maintenance costs. Furthermore, during subsequent use, only the thin material strip 30 needs to be cut, ensuring the integrity of the surface treatment of the square-shaped terminal 10 and avoiding the risk of exposed copper at the end.

[0044] See also Figure 1 and Figure 2As an example, the lead-in portion is defined as a first lead-in portion 111 and a second lead-in portion 112, wherein the first lead-in portion 111 is positioned near the first clamping point 121, and the second lead-in portion 112 is positioned into the second clamping point 122. It is understood that the first lead-in portion 111 and the second lead-in portion 112 can be any shape that is convenient for plugging or welding, and can be the same or different.

[0045] See also Figure 2-5 Furthermore, in some embodiments, the first engagement point 121 includes a first connection surface 1211 that gradually moves away from the outer wall surface 113, and the second engagement point 122 includes a second connection surface 1221 that gradually moves away from the outer wall surface 113. During the insertion of the four-pin terminal 10 into the connector terminal, the first connection surface 1211 or the second connection surface 1221 acts as a guide surface, interfering with and squeezing the connector body, causing relative sliding. Preferably, the first connection surface 1211 and the second connection surface 1221 are curved or flat surfaces. This improves the guidance of the first and second engagement points 121, 122, and further reduces the insertion force of the four-pin terminal 10.

[0046] It is understood that for thicker square pin terminals 10, stamping is typically performed from the edge of the outer wall 113 toward the interior of the outer wall 113, causing the material to tear and form a retaining point. In this embodiment, the first and second retaining points 121, 122 are inclined inward along the length of the outer wall 113. The protruding ends of the first and second retaining points 121, 122 gradually converge toward the interior of the outer wall 113, forming a first angle a1 between the first and second retaining points 121, 122. The first angle a1 ranges from 0 to 180 degrees. Preferably, the first angle a1 is 90 to 180 degrees.

[0047] As a preferred embodiment, the first clamping point 121 and the second clamping point 122 are symmetrically arranged relative to a cross section in the width direction of the terminal body 11. Under this arrangement, the insertion force from both ends of the square pin terminal into the connector body can be consistent.

[0048] Furthermore, in some embodiments, the clamping point structure 12 further includes a third clamping point 123 and a fourth clamping point 124, which are disposed on the same outer wall surface 113 as the first clamping point 121 and the second clamping point 122. The third clamping point 123 is spaced apart from the first clamping point 121 in the width direction of the outer wall surface 113. The first clamping point 121 and the third clamping point 123 gradually approach each other at their ends near the second clamping point 122, and the first clamping point 121 and the third clamping point 123 are both disposed at a certain angle to the terminal body 11, thereby forming a first accommodation gap 126 that gradually approaches the middle of the outer wall surface 113 of the terminal body 11. The fourth clamping point 124 and the second clamping point 122 are spaced apart in the width direction of the outer wall surface 113, and the second clamping point 122 and the fourth clamping point 124 gradually approach one end close to the first clamping point 121, and the third clamping point 123 and the fourth clamping point 124 are both set at a certain angle to the terminal body 11 to form a second accommodating gap 127 that gradually approaches the middle part of the outer wall surface 113 of the terminal body 11.

[0049] When the four-pin terminal 10 is inserted into the connector body with the first introduction portion 111, the first clamping point 121 and the third clamping point 123 interfere with and squeeze the inner wall of the connector body. As the four-pin terminal 10 slides to a fixed position relative to the connector body, the material of the interfering portion of the connector body is squeezed through the first accommodating gap 126 to the spacing space 125, thereby providing resistance to the protruding ends of the first clamping point 121 and the third clamping point 123 to prevent them from retreating. At the same time, resistance can be provided to the protruding ends of the second clamping point 122 and the fourth clamping point 124 to prevent the four-pin terminal 10 from falling out of the connector body.

[0050] Similarly, when the four-pin terminal 10 is inserted into the connector body with the second introduction part 112, the second clamping point 122 and the fourth clamping point 124 first interfere and squeeze with the inner wall of the connector body. As the four-pin terminal 10 slides to a fixed position relative to the connector body, the material of the interfering part of the connector body is squeezed through the second accommodating gap 127 to the spacing space 125, so as to provide resistance to the protruding ends of the first clamping point 121, the third clamping point 123, the second clamping point 122 and the fourth clamping point 124 to prevent the four-pin terminal 10 from falling out of the connector body.

[0051] Furthermore, in some embodiments, the third clamping point 123 and the first clamping point 121 are symmetrically arranged in the width direction of the outer wall surface 113, and a second angle a2 is formed between the third clamping point 123 and the first clamping point 121; the fourth clamping point 124 and the second clamping point 122 are symmetrically arranged in the width direction of the outer wall surface 113.

[0052] Preferably, the first angle a1 is greater than or equal to the second angle a2, thereby reducing resistance in the insertion direction. The second angle a2 is between 0° and 90°. Within this angle range, the structure of the clamping point structure 12 is more stable and the insertion force is lower. More preferably, the second angle a2 is between 15° and 45°.

[0053] Furthermore, in some embodiments, the length L of the space 125 between the first and second gripping points 121, 122 in the lengthwise direction of the terminal body 11 is less than the vertical height of the first and second gripping points 121, 122 in that direction. Within this range, when the four-pin terminal 10 is inserted into the connector body at either end, the material that is squeezed and forced by the interference does not have time to recover and become stuck in the space 125 as the four-pin terminal 10 slides relative to the connector body. This allows the four-pin terminal 10 to be smoothly inserted into a fixed position with a low insertion force. Once the four-pin terminal 10 is inserted into the fixed position and stops sliding, the material that was squeezed and forced by the interference recovers and becomes stuck in the space 125, providing resistance to the four-pin terminal 10's withdrawal and improving its stability.

[0054] Furthermore, in some embodiments, the number of the retaining structure 12 can be multiple groups, each provided on different outer wall surfaces 113 of the terminal body 11. In this embodiment, the number of the retaining structure 12 is two groups, each symmetrically provided on two opposite outer wall surfaces 113 of the terminal body 11, to increase the holding force of the square pin terminal 10.

[0055] See also Figure 6-8 , an embodiment of the present application also provides a through-cylinder connector, one end of which passes through the cylinder body and is sealed and connected to the first female end, and the other end is sealed and connected to the second female end. The through-cylinder connector includes: a connector body 20 and a four-pin terminal 10. The connector body 20 is provided with a fixed portion 23, a first plug-in portion 21 and a second plug-in portion 22; the first plug-in portion 21 and the second plug-in portion 22 are respectively provided at both ends of the fixed portion 23; the four-pin terminal 10 can be inserted into the connector body 20 via the first plug-in portion 21 or the second plug-in portion 22, until the card point structure 12 is carded to the fixed portion 23. The card point structure 12 based on the bidirectional insertion can maintain a low insertion force to improve the assembly efficiency of the through-cylinder connector; at the same time, the bidirectional insertion card point structure 12 can maintain a high pull-out force to avoid the poor sealing of the through-cylinder connector caused by the loosening of the four-pin terminal 10.

[0056] Specifically, a first slot 211 is defined on one end face of the first plug-in portion 21, which is away from the fixing portion 23, for accommodating the first female end. A second slot 221 is defined on one end face of the second plug-in portion 22, which is away from the fixing portion 23, for accommodating the second female end. The sidewall of the first slot 211 is provided with at least one elastic arm buckle 212. When the elastic arm buckle 212 is elastically squeezed, it elastically deforms, allowing the first plug-in portion 21 to pass through the cylinder. After the first plug-in portion 21 passes through the cylinder, the elastic arm buckle 212 elastically recovers and then engages with the first female end.

[0057] Furthermore, in some embodiments, a first notch 213 is cut into the side wall of the first slot 211, and the elastic arm buckle 212 is arranged in the first notch 213 and can undergo elastic deformation in the first notch 213, thereby increasing the deformation space of the elastic arm buckle 212 during the installation process.

[0058] Preferably, the number of the elastic arm buckles 212 is two, and first notches 213 are cut into two opposite side walls of the first slot 211 . The two elastic arm buckles 212 are respectively arranged at the two first notches 213 .

[0059] Furthermore, in some embodiments, the sidewalls of the first slot 211 are further provided with a second snap-fit ​​structure 214 for further snapping with the first female end. The second snap-fit ​​structure 214 and the elastic snap-fit ​​arm 212 are respectively provided on different sidewalls of the first slot 211 to ensure the rigidity of the first slot 211. Preferably, the second snap-fit ​​structure 214 can be a second notch or another snap-fit ​​structure capable of snapping with the first female end.

[0060] Furthermore, a sealing groove 215 is defined at the bottom of the first slot 211. A sealing medium is disposed within the sealing groove 215, into which the four-pin terminal 10 is inserted. The sealing medium is used to fill the gap between the four-pin terminal 10 and the connector body 20, thereby enhancing the sealing performance of the connector body 20. It is understood that the sealing medium may be a potting epoxy resin or other means capable of achieving the same sealing effect.

[0061] Furthermore, a sealing rubber gasket may be provided inside the first slot 211, and when the first female end is inserted, it abuts against the bottom or inner wall of the first slot 211. The sealing rubber gasket is clamped between the first female end and the first slot 211 to achieve sealed abutment between the two.

[0062] Furthermore, the sidewall of the second slot 221 is provided with a third snap-fit ​​structure 223 for engaging with the second female end. Preferably, the third snap-fit ​​structure 223 can be a third notch or other snap-fit ​​structure capable of engaging with the second female end, thereby stably securing the second female end to the connector body 20. Furthermore, the outer surface of the second plug-in portion 22 is provided with several protruding positioning ribs 222 for foolproof positioning of the second female end during insertion.

[0063] Furthermore, the connector body 20 is provided with a sealing portion 24, which is disposed between the fixing portion 23 and the first plug-in portion 21 and is used to seal the insertion gap between the through-cylinder connector and the cylinder body. The sealing portion 24 is provided with at least one annular groove 241 and at least one sealing member 242. The sealing member 242 is correspondingly disposed within the annular groove 241 and protrudes from the notch of the annular groove 241, sealingly abutting against the inner wall of the cylinder body through-hole. Specifically, the sealing member 242 can be an elastic sealing ring such as a silicone ring or a rubber ring.

[0064] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0065] (1) By providing a bidirectionally guided card point structure, the square pin terminal can be inserted into the connector body from either end with low insertion force and can maintain a stable retention force with the connector body;

[0066] (2) A space is provided between two clamping points in the length direction to accommodate the connector main body material that has been squeezed and deformed. When the four-pin terminal stops sliding, the material that has been squeezed and deformed recovers and is clamped into the space, thereby providing resistance to the withdrawal of the four-pin terminal and improving its stability.

[0067] (3) The terminal wire is drawn through an eye die into a terminal body with a certain width and thickness by a wire drawing process, and then the lead-in parts and the card point structure at both ends of the terminal body are formed by stamping, which can save mold costs and equipment costs;

[0068] (4) The four-pin terminals are independently clamped by the material strip, and the head or tail does not need to be connected, which can avoid the risk of exposed copper at the end;

[0069] (5) By applying bidirectional low insertion force square pin terminals to through-cylinder connectors, the stability and sealing performance of through-cylinder connectors can be effectively maintained while improving production efficiency.

[0070] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the concept of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A bidirectional low insertion force square pin terminal, characterized in that: include: terminal body; At least one set of latching point structures provided on an outer wall surface of the terminal body; The card point structure includes a first card point and a second card point spaced apart along the length direction of the terminal body; the ends of the first card point and the second card point that are close to each other protrude from the outer wall surface of the terminal body, and the ends of the first card point and the second card point that are away from each other extend and are connected to the outer wall surface of the terminal body.

2. The bidirectional low insertion force square pin terminal according to claim 1, characterized in that: The first clamping point and the second clamping point are arranged at a first angle, and the first angle is 0-180°.

3. The bidirectional low insertion force square pin terminal according to claim 2, characterized in that: The first clamping point and the second clamping point are symmetrically arranged relative to a cross section in a width direction of the terminal body.

4. The bidirectional low insertion force square pin terminal according to claim 2, characterized in that: The card point structure further includes a third card point and a fourth card point; The third clamping point is spaced apart from the first clamping point in the width direction of the outer wall surface, the first clamping point and the third clamping point are close to each other at their ends close to the second clamping point, and the first clamping point and the third clamping point are both arranged at a certain angle to the terminal body to form a first accommodation gap close to the middle of the outer wall surface of the terminal body; The fourth clamping point and the second clamping point are spaced apart in the width direction of the outer wall, the second clamping point and the fourth clamping point are close to each other at one end close to the first clamping point, and the third clamping point and the fourth clamping point are both set at a certain angle to the terminal body to form a second accommodating gap close to the middle of the outer wall of the terminal body.

5. The bidirectional low insertion force square pin terminal according to claim 4, characterized in that: The third clamping point and the first clamping point are symmetrically arranged in the width direction of the outer wall surface, and a second angle is formed between the third clamping point and the first clamping point; the fourth clamping point and the second clamping point are symmetrically arranged in the width direction of the outer wall surface.

6. The bidirectional low insertion force square pin terminal according to claim 5, characterized in that: The first angle is greater than or equal to the second angle.

7. The bidirectional low insertion force square pin terminal according to claim 1, characterized in that: The first clamping point includes a first connection surface gradually away from the outer wall surface of the terminal body, and the second clamping point includes a second connection surface gradually away from the outer wall surface of the terminal body; the first connection surface and the second connection surface are arc surfaces or plane surfaces.

8. The bidirectional low insertion force square pin terminal according to claim 1, characterized in that: The number of the clamping point structures is two groups, which are symmetrically arranged on two opposite outer wall surfaces of the terminal body.

9. The bidirectional low insertion force square pin terminal according to any one of claims 1 to 8, characterized in that: The terminal body further includes introduction portions respectively provided at both ends in the length direction of the terminal body.

10. A cylinder connector, characterized in that: include: A connector body and a four-pin terminal according to any one of claims 1 to 9; The connector body is provided with a fixed part, a first plug-in part and a second plug-in part; the first plug-in part and the second plug-in part are respectively provided at both ends of the fixed part; the four-pin terminal can be inserted into the connector body via the first plug-in part or the second plug-in part; the card point structure is carded to the fixed part.

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