A contact piece, a plug sleeve structure and a composite hole sleeve structure

Abstract

The present invention discloses a contact piece, comprising a metal cylinder, a gap is provided in the axial direction of the metal cylinder, and a plurality of mutually separated bending spring pieces are provided at both ends of the metal cylinder, and the bending direction of the bending spring pieces is bent from the center of the metal cylinder to the outer wall of the metal cylinder. The present invention provides a contact piece with a short structure and excellent conductive effect.

Description

Technical Field

[0001] The present invention relates to the technical field of contact pieces, and in particular to a contact piece, a plug-in sleeve structure and a composite hole sleeve structure. Background Art

[0002] With the rapid development of electronic products, the parts and components related to electronic products have also developed rapidly, especially the electrical connector contacts.

[0003] The contact parts of existing electrical connectors are mainly divided into two categories: the first category adopts a spring structure. The main factors affecting the contact resistance R (Ω) of the contact part itself are: a. The effective conductive distance L (m) of the conductor, b. The resistivity ρ (Ω·mm 2 / m), c. Conductor effective conductive cross-sectional area A (mm 2 ).

[0004] Its principle expression is:

[0005] When the materials of the contacts are the same (ie, the resistivity ρ is the same) and the length L of the contacts is the same, the factor affecting the contact resistance R of the contacts is the conductive cross-sectional area A. Since the contact area A of the spring is relatively small, the conductive effect of the spring-type contacts is poor.

[0006] The second category adopts a compact jack contact such as that disclosed in Chinese patent CN201010614586.2, which includes an integrally formed metal cylindrical body, the cylindrical wall of which is composed of a plurality of bars connected at both ends, and the bars are evenly distributed, the metal cylindrical body is spiral-shaped as a whole, and the projection of the axial section of the cylindrical wall is a hyperbolic waisted structure.

[0007] This type of contact is in contact with the plug-in connector through the waisted portion. When the materials of the contact are the same (i.e., the resistivity ρ is the same), although this type of contact can ensure that its conductive area A is increased, the extension of the conductive distance L from the waisted portion to the two ends will inevitably increase the contact resistance R of the contact. In addition, in order to ensure that the waisted portion has good elasticity, the second type of contact must be made relatively long. Therefore, it is difficult to adapt to the insertion of a short plug-in, and more materials will be consumed.

[0008] Therefore, inventing a contact piece with a short structure and excellent conductive effect is the primary technical problem to be solved by those skilled in the art. Summary of the invention

[0009] The object of the present invention is to provide a contact piece with a short structure and excellent conductive effect.

[0010] The technical solution adopted by a contact member disclosed in the present invention is:

[0011] A contact piece comprises a metal cylinder, wherein a gap is arranged in the axial direction of the metal cylinder, and a plurality of mutually separated bending spring pieces are arranged at both ends of the metal cylinder, wherein the bending direction of the bending spring pieces is bent from the center of the metal cylinder to the outer wall of the metal cylinder.

[0012] As a preferred solution, the distances between two adjacent bent spring sheets are the same.

[0013] As a preferred solution, the multiple bent spring pieces at both ends of the metal tube are arranged symmetrically.

[0014] As a preferred embodiment, the bent spring sheet includes a first end, a second end and a first bent portion, the first bent portion is located between the first end and the second end, the first end is connected to the end of the metal tube, and the second end is away from the outer wall of the metal tube.

[0015] As a preferred solution, the second end portion is bent toward the metal tube to form a second bent portion.

[0016] As a preferred solution, the metal tube and the bent spring sheet are integrally formed.

[0017] The technical solution also provides a socket structure, including a socket, a receiving groove is provided at one end of the socket, and at least a first annular groove is provided on the groove wall of the receiving groove; it also includes a contact piece as mentioned above, the contact piece is inserted into the first annular groove, the bent spring sheet is in contact with the bottom of the first annular groove at one end away from the outer wall of the metal tube, and the bending corner of the bent spring sheet is tilted out of the notch of the first annular groove.

[0018] As a preferred embodiment, the distance from the metal cylinder to the second bent portion is greater than the depth of the first annular groove, the axial length of the contact piece is greater than the width of the first annular groove, the second bent portion contacts the bottom of the first annular groove, the second end portion contacts the opening of the first annular groove, the first bent portion is warped and extends out of the opening of the first annular groove, and the first end portion forms an angle with the inner wall of the metal cylinder.

[0019] The present technical scheme also provides a composite hole sleeve structure, including a hole sleeve, a rotating spring is arranged in the hole sleeve, hollow pressure covers are arranged at both ends of the hole sleeve, the hollow pressure covers fix and press the ends of the rotating spring and the ends of the hole sleeve, and a second annular groove is opened in the middle of the inner wall of the hole sleeve; it also includes a contact piece as mentioned above, the contact piece is sleeved in the middle of the rotating spring, the contact piece is inserted into the second annular groove, the bent spring sheet is in contact with the bottom of the second annular groove at one end away from the outer wall of the metal cylinder, the bending angle of the bent spring sheet is tilted out of the notch of the second annular groove, and is in contact with the outer wall of the rotating spring.

[0020] As a preferred embodiment, the distance from the metal tube to the second bent portion is greater than the depth of the second annular groove, the axial length of the contact piece is greater than the width of the second annular groove, the second bent portion contacts the bottom of the second annular groove, the second end portion contacts the opening of the second annular groove, the first bent portion extends out of the opening of the second annular groove, and the first bent portion contacts the outer wall of the rotation spring.

[0021] A contact disclosed in the present invention has the following beneficial effects: a gap is provided in the axial direction of the metal cylinder, and a plurality of mutually separated bent spring sheets are provided at both ends of the metal cylinder, and the bending direction of the bent spring sheets is from the center of the metal cylinder toward the outer wall of the metal cylinder; when the external pin is inserted, the pin contacts the inner wall of the metal cylinder and one end of the bent spring sheet respectively, and when the contact material is the same (that is, the resistivity ρ is the same), its effective conductive length L is the length of the bent spring sheet away from one end of the metal cylinder, that is, the conductive length L is shortened, and at the same time, the current is conducted together by the plurality of bent spring sheets at both ends of the metal cylinder, that is, the conductive cross-sectional area A is increased. Combining the above structure and the contact resistance formula, it can be seen that the contact resistance R of the contact piece will be greatly reduced; and the axial length of the metal cylinder in the structure is shorter than that of the existing contact piece, and therefore, the contact piece has a better conductive effect when applied to a short plug connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a contact piece according to an embodiment of the present invention.

[0023] Figure 2 4 is a cross-sectional view of a contact member according to an embodiment of the present invention.

[0024] Figure 3 It is an enlarged view of region A of a contact element according to an embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of the assembly structure of a socket structure according to the second embodiment of the present invention.

[0026] Figure 5 It is a cross-sectional view of a socket structure according to the second embodiment of the present invention.

[0027] Figure 6 It is an enlarged view of area B of a socket structure according to the second embodiment of the present invention.

[0028] Figure 7 It is a schematic diagram of the matching between a socket structure and a plug pin according to the second embodiment of the present invention.

[0029] Figure 8 It is a cross-sectional view of a socket structure and a plug pin in accordance with a second embodiment of the present invention.

[0030] Fig. 9 It is an enlarged view of area C of a plug-in structure according to the second embodiment of the present invention.

[0031] Fig.10 It is a schematic diagram of the assembly structure of a composite hole sleeve structure according to embodiment 3 of the present invention.

[0032] Fig.11 It is a cross-sectional view of a composite hole sleeve structure according to embodiment 3 of the present invention.

[0033] Fig.12 It is an enlarged view of the D area of ​​a composite hole sleeve structure in Example 3 of the present invention.

[0034] Fig.13 It is a schematic diagram of the cooperation between a composite hole sleeve structure and a plug pin according to the third embodiment of the present invention.

[0035] Fig.14 It is a cross-sectional view of a composite hole sleeve structure and a pin in accordance with a third embodiment of the present invention.

[0036] Fig.15 It is an enlarged view of the E area of ​​a composite hole sleeve structure in Example 3 of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0038] Example 1: Please refer to Figure 1 and Figure 2 A contact piece 10 includes a metal tube 11 and a plurality of bent spring pieces 12.

[0039] A slit 111 is provided in the axial direction of the metal cylinder 11. The width of the slit 111 changes with the squeezing of the outer wall of the metal cylinder 11, thereby fine-tuning the diameter of the metal cylinder 11. Therefore, the metal cylinder 11 can enter a slightly narrow space, and then the slit 111 can be expanded by its own recovery ability, and the metal cylinder 11 can be stuck to the limit end of the slightly narrow space.

[0040] A plurality of mutually separated bending spring pieces 12 are respectively disposed at both ends of the metal cylinder 11 . The bending direction of the bending spring pieces 12 is from the center of the metal cylinder 11 to the outer wall of the metal cylinder 11 .

[0041] When the external pin is inserted, the pin contacts the inner wall of the metal tube 11 and one end of the bent spring sheet 12 respectively. When the material of the contact 10 is the same (i.e. the resistivity ρ is the same), its effective conductive length L is the length of the bent spring sheet 12 away from the end of the metal tube 11, that is, the conductive length L is shortened; at the same time, the multiple bent spring sheets 12 at both ends of the metal tube 11 conduct current together, that is, the conductive cross-sectional area A is increased. Combining the above structure and the contact resistance formula, it can be seen that the contact resistance R of the contact 10 will be greatly reduced. In addition, the axial length of the metal tube 11 in this structure is shorter than that of the existing contact 10. Therefore, the contact 10 has a better conductive effect when applied to short plug connectors.

[0042] The distance between two adjacent bent spring pieces 12 is the same, and the multiple bent spring pieces 12 at both ends of the metal tube 11 are arranged symmetrically, so that the force on each bent spring piece 12 is more uniform, the number of deformations is increased, and the service life is further extended.

[0043] Please refer to Figure 3 The bent spring piece 12 includes a first end 121, a second end 122 and a first bent portion 123. The first bent portion 123 is located between the first end 121 and the second end 122. The first end 121 is connected to the end of the metal cylinder 11, and the second end 122 is away from the outer wall of the metal cylinder 11. The cross-section of the first end 121 and the cross-section of the second end 122 are both arc-shaped, and the curvature of the arc of the first end 121 is the same as the curvature of the arc of the inner wall of the metal cylinder 11. In other words, the first end 121 is on the axial extension line of the inner wall of the metal cylinder 11. The bending angle range of the first bent portion 123 is 10° to 60°.

[0044] The second end portion 122 is bent toward the metal tube 11 to form a second bent portion 124. Specifically, the second bent portion 124 contacts with other connector surfaces through its smooth arc surface. When the bent spring piece 12 is squeezed and deformed, the second bent portion 124 moves more smoothly on the connector surface. The bending angle range of the second bent portion 124 is 0° to 60°.

[0045] In this embodiment, the metal tube 11 and the bent spring piece 12 are integrally stamped and formed, thereby enhancing the toughness and elasticity of the contact member 10 .

[0046] Example 2: Please refer to Figure 4-Figure 6 On the basis of the first embodiment, the present technical solution further provides a socket structure, including a socket 20 and the contact member 10 disclosed in the first embodiment.

[0047] One end of the plug sleeve 20 is provided with a receiving groove 21, and the groove wall of the receiving groove 21 is provided with at least one first annular groove 22. By the method of compressing the gap 111, the contact 10 is squeezed into the first annular groove 22 with a slight tilt.

[0048] Since the distance from the metal cylinder 11 to the second bent portion 124 in this embodiment is greater than the depth of the first annular groove 22, the axial length of the contact member 10 is greater than the width of the first annular groove 22. Therefore, when the second bent portion 124 contacts the bottom of the first annular groove 22, the second end portion 122 touches the notch of the first annular groove 22, and the first bent portion 123 is tilted and extends out of the notch of the first annular groove 22. At the same time, the first end portion 121 forms an angle with the inner wall of the metal cylinder 11. The angle ranges from 0° to 15°.

[0049] Please refer to Figure 7-Figure 9 When the external pin 30 is inserted, the first bent portion 123 of the multiple bent spring sheets 12 at one end of the metal cylinder 11 first contacts the pin 30. As the pin 30 goes deeper, the first bent portion 123 bends, and the distance between two adjacent bent spring sheets 12 gradually decreases; due to the limiting effect of the notch of the first annular groove 22, the second end 122 will press the notch of the first annular groove 22, and the second bent portion 124 will be pressed to bend toward the outer wall of the metal cylinder 11, and the first end 121 will rotate toward the pin 30 as the first bent portion 123 bends. When the pin 30 goes deeper into the metal cylinder 11, the first end 121 of the multiple bent spring sheets 12 that first contact the pin 30 is completely attached to the outer wall of the pin 30, and at this time, the first end 121 is restored to the extension line of the axial direction of the inner wall of the metal cylinder 11. When the pin 30 is fully inserted, the first ends 121 of the bent springs 12 at both ends of the metal tube 11 are completely attached to the outer wall of the pin 30. At this time, the first ends 121 at both ends of the metal tube 11 are on the axial extension line of the inner wall of the metal tube 11, that is, the inner wall of the contact 10 is in contact with the pin 30.

[0050] At this time, without considering the material of the contact piece 10 (that is, the resistivity ρ1 is the same), its effective conductive length L1 is the top contact line from the first bend portion 123 to the second bend portion 124 and the bottom of the first annular groove 22. Compared with the conductive length in the prior art, the conductive length L1 in this embodiment is greatly shortened; at the same time, combined with the arc shape of the second end portion 122 disclosed in Example 1, it is completely fitted in the notch of the first annular groove 22, and its effective conductive cross-sectional area A1 can be approximated as a circular line. Compared with the existing multi-point contact, the conductive cross-sectional area A1 is actually increased; therefore, the contact resistance R1 in this embodiment is greatly reduced.

[0051] Example 3: Please refer to Figure 10-12 On the basis of the first embodiment, the present technical solution further provides a composite hole sleeve structure, including a hole sleeve 40, a rotation spring 50, a plurality of hollow pressure covers 60 and the contact member 10 disclosed in the first embodiment.

[0052] The rotary spring 50 in this embodiment has a waisted structure with larger diameters at both ends and a smaller diameter in the middle. A second annular groove 41 is provided in the middle of the inner wall of the hole sleeve 40 .

[0053] The contact member 10 is sleeved in the middle of the rotating spring 50, and both are arranged in the hole sleeve 40. The contact member 10 is correspondingly inserted into the second annular groove 41. The hollow pressure cover 60 presses the end of the rotating spring 50 and the end of the hole sleeve 40 together.

[0054] The installation method of the composite hole sleeve 40 is as follows:

[0055] First, the gap 111 of the contact piece 10 is enlarged to increase the diameter of the metal tube 11, and then the contact piece 10 is sleeved on the middle part of the rotating spring 50; then the two are squeezed into the inside of the hole sleeve 40 from one end of the hole sleeve 40, and the contact piece 10 is correspondingly inserted into the second annular groove 41; finally, the end of the rotating spring 50 and the end of the hole sleeve 40 are pressed together through the hollow pressure cover 60.

[0056] Since the distance from the metal cylinder 11 to the second bent portion 124 in this embodiment is greater than the depth of the second annular groove 41, the axial length of the contact member 10 is greater than the width of the second annular groove 41. Therefore, the second bent portion 124 contacts the bottom of the second annular groove 41, the second end portion 122 contacts the notch of the second annular groove 41, the first bent portion 123 extends out of the notch of the second annular groove 41, and the corner of the first bent portion 123 contacts the outer wall of the rotation spring 50.

[0057] Please refer to Figure 13-Figure 15 When the external pin 70 is inserted, the middle of the rotating spring 50 is squeezed toward the surroundings until it is completely fitted with the contact piece 10.

[0058] At this time, without considering the material of the contact piece 10 (i.e. the resistivity ρ is the same). Its partial effective conductive length L2 is the top contact line between the first bend 123 and the second bend 124 and the bottom of the second annular groove 41, and its other part of the effective conductive length L3 is the length between the middle of the rotating spring 50 and the two ends of the rotating spring 50, which shortens part of the conductive length compared with the prior art. At the same time, combined with the arc shape of the second end 122 disclosed in the first embodiment, it is completely fitted in the notch of the second annular groove 41, and its conductive cross-sectional area A2 can be approximated as a circular line; plus the original conductive cross-sectional area A3; the conductive cross-sectional area A2 and the conductive cross-sectional area A3 are superimposed to obtain the total effective conductive cross-sectional area A4, so that the total effective conductive cross-sectional area A4 is increased. Therefore, the contact resistance R2 in this embodiment is greatly reduced.

[0059] The present invention provides a contact piece, wherein a gap is provided in the axial direction of a metal cylinder, and a plurality of mutually separated bent spring sheets are provided at both ends of the metal cylinder, and the bending direction of the bent spring sheets is bent from the center of the metal cylinder toward the outer wall of the metal cylinder; when an external pin is inserted, the pin contacts the inner wall of the metal cylinder and one end of the bent spring sheet respectively, and under the condition that the contact piece material is the same (that is, the resistivity ρ is the same), its effective conductive length L is the length of the bent spring sheet away from one end of the metal cylinder, that is, the conductive length L is shortened, and at the same time, the current is conducted together by the plurality of bent spring sheets at both ends of the metal cylinder, that is, the conductive cross-sectional area A is increased. Combining the above structure and the contact resistance formula, it can be seen that the contact resistance R of the contact piece will be greatly reduced; and the axial length of the metal cylinder in the structure is shorter than that of the existing contact piece, and therefore, the contact piece has a better conductive effect when applied to a short plug connector.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A composite hole sleeve structure, comprising a hole sleeve, a rotating spring is arranged inside the hole sleeve, and hollow glands are arranged at both ends of the hole sleeve, and the hollow glands are fixedly pressed together with the ends of the rotating spring and the ends of the hole sleeve, characterized in that: A second annular groove is provided in the middle of the inner wall of the hole sleeve; The cam is an angular channel formed between a first end and a second end of the cam, the second end of the cam being abutted against the bottom of the cam and against the bottom of the cam.

2. A composite hole sleeve structure according to claim 1, characterized in that: The distance from the metal tube to the second bent portion is greater than the depth of the second annular groove, the axial length of the contact piece is greater than the width of the second annular groove, the second bent portion contacts the bottom of the second annular groove, the second end portion contacts the opening of the second annular groove, the first bent portion extends out of the opening of the second annular groove, and the first bent portion contacts the outer wall of the rotation spring.

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