A high current torsion spring contact

Abstract

The utility model relates to electric automobile connector technical field especially relates to a kind of large-current torsion spring contact piece.Large-current torsion spring contact piece includes sleeve, torsion spring is sleeved in the inside of sleeve, torsion spring front end has several rearward bending's cantilever, each cantilever hooks sleeve front end outer circumferential surface, sleeve front end outside is sheathed with sheath and each cantilever is pressed tightly and adhered on sleeve front end outer circumferential surface, sleeve front end outer circumferential surface is equipped with anti-drop limiting structure, anti-drop limiting structure is stopped from front side to cantilever and prevents torsion spring from being loosened forward.By the stop of anti-drop limiting structure from front side to cantilever and prevent torsion spring from being loosened forward, it can be guaranteed that after being plugged in and unplugged for many times, due to the stop effect of anti-drop limiting structure, torsion spring is not prone to loosening forward, and further guarantee connection reliability.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle connector technology, and in particular to a high-current torsion spring contact. Background Technology

[0002] Electric vehicle charging sockets use circular contacts (female terminals) as an indispensable part of the power connection. Torsion spring contacts are widely used in the power connection of electric vehicle charging sockets due to their advantages such as multiple contact points, low contact resistance, long mechanical life, and resistance to oblique insertion. A common existing torsion spring contact consists of an outer sleeve and a torsion spring coaxially fitted inside the outer sleeve. The outer sleeve's insertion end is fitted with a protective sleeve, and the front end of the protective sleeve has an inwardly folded-down buckle structure. This buckle presses against the inside of the torsion spring's front end, thus limiting the torsion spring's movement. The problem with existing torsion spring contacts is that when the insulating cap on the charging gun pins is damaged and flipped outwards, or when the pin contact itself is severely worn, the charging gun may easily touch the buckle of the protective sleeve during removal, causing the inner opening of the protective sleeve to flip outwards. This results in the loss of the torsion spring's limiting function, leading to connection failure due to the torsion spring's inability to hold.

[0003] Chinese utility model patent CN214153248U discloses a single-piece coiled torsion spring socket contact. This socket contact includes a sleeve containing a torsion spring. The torsion spring has several backward-bent coils (i.e., suspension plates) at its front end, which hook onto the outer edge of the sleeve's insertion end. A retaining ring (i.e., a protective sleeve) is fitted around the outside of the coils, pressing them tightly against the outer edge of the sleeve's insertion end, thus limiting the torsion spring's position. This socket contact has no undercut structure at the front end of the retaining ring, allowing for smoother insertion and removal and eliminating the risk of the retaining ring being hooked off. However, during insertion and removal, the torsion spring needs to withstand a certain insertion and removal force. After repeated insertion and removal operations, the torsion spring may still loosen, leading to connection failure. Utility Model Content

[0004] The purpose of this invention is to provide a high-current torsion spring contact to solve the problem that existing torsion spring contacts are prone to loosening after repeated insertion and removal, leading to connection failure.

[0005] The present invention adopts the following technical solution:

[0006] A high-current torsion spring contact includes a sleeve, inside which a torsion spring is fitted. The front end of the torsion spring has several rearwardly bent suspension plates, each of which hooks onto the outer peripheral surface of the front end of the sleeve. A protective sleeve is fitted on the outer side of the front end of the sleeve to press each suspension plate tightly against the outer peripheral surface of the front end of the sleeve. An anti-disengagement limiting structure is provided on the outer peripheral surface of the front end of the sleeve. The anti-disengagement limiting structure blocks the suspension plates from the front to prevent the torsion spring from loosening forward.

[0007] Furthermore, a rearward-facing shoulder is provided on the outer peripheral surface of the front end of the sleeve, and the shoulder constitutes the anti-detachment limiting structure.

[0008] Furthermore, the front end of the sleeve has a forward-facing protective sleeve positioning surface, the protective sleeve is fixed at the protective sleeve positioning surface, and the length of the protective sleeve is less than the distance between the anti-detachment limiting structure and the protective sleeve positioning surface.

[0009] Furthermore, the sheath includes a front large-diameter section, a rear small-diameter section, and a middle tapered section that transitions between the front large-diameter section and the rear small-diameter section. The front large-diameter section and the rear small-diameter section are respectively pressed against the front and rear sections of the suspension plate, and the middle tapered section is pressed against the middle of the suspension plate, causing the middle of the suspension plate to bend inward and form a stop fit with the anti-slip limiting structure.

[0010] Furthermore, the front end of the sheath has an inward flange, which is pressed against the front end face of the torsion spring. The diameter of the circle formed by the inward flange is greater than or equal to the diameter of the torsion spring insertion hole.

[0011] Furthermore, the sheath is riveted to the sleeve.

[0012] Furthermore, the torsion spring includes a front spring coil, a rear spring coil, and several spring strips connected between the two spring coils. Several spring sheets are evenly distributed along the circumference of the front spring coil, and the spring sheets are bent backward to form the suspension sheet.

[0013] Beneficial effects: This utility model of a high-current torsion spring contact is an improved invention. The suspension plate at the front end of the torsion spring hooks onto the outer circumferential surface of the front end of the sleeve. A protective sleeve is fitted on the outer side of the front end of the sleeve to press each suspension plate tightly against the outer circumferential surface of the front end of the sleeve. Based on this, an anti-disengagement limiting structure is provided on the outer circumferential surface of the front end of the sleeve. The anti-disengagement limiting structure stops the suspension plate from the front, preventing the torsion spring from loosening forward. This ensures that after multiple insertion and removal operations, the torsion spring is not easy to loosen forward due to the blocking effect of the anti-disengagement limiting structure, thereby ensuring the reliability of the connection. Attached Figure Description

[0014] Figure 1 This is an exploded view of Embodiment 1 of the high-current torsion spring contact component of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the high-current torsion spring contact component of this utility model;

[0016] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0017] Figure 4 This is an exploded view of Embodiment 2 of the high-current torsion spring contact component of this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the high-current torsion spring contact component of this utility model;

[0019] Figure 6 for Figure 5 Enlarged view at point B in the middle;

[0020] In the diagram: 1. Sleeve; 1-1. Shoulder; 1-2. Sheath positioning surface; 2. Torsion spring; 2-1. Suspension plate; 2-2. Front spring ring; 2-3. Spring bar; 2-4. Rear spring ring; 3. Sheath; 3-1. Front large diameter section; 3-2. Middle tapered section; 3-3. Rear small diameter section; 3-4. Inner flange. Detailed Implementation

[0021] Existing torsion spring contacts use a sleeve on the outer side of the sleeve's front end to limit the torsion spring's position within the sleeve by pressing the sleeve against the spring's front end suspension plate. During insertion and removal, the torsion spring needs to withstand a certain insertion and removal force, and after repeated insertion and removal operations, the torsion spring is prone to loosening, leading to connection failure. Therefore, this invention provides a high-current torsion spring contact that improves the reliability of the torsion spring's position. The basic inventive concept of this invention is: based on the existing torsion spring contact structure, an anti-disengagement limiting structure is set on the outer circumferential surface of the sleeve's front end. This anti-disengagement limiting structure blocks the spring's front end suspension plate from the front, thereby preventing the torsion spring from loosening forward.

[0022] Based on the above inventive concept, the embodiments of this utility model are described in detail below.

[0023] Example 1 of the high-current torsion spring contact of this utility model:

[0024] like Figure 1-3As shown, the high-current torsion spring contact of this utility model includes a sleeve 1, with a plug-in end at the front end of the sleeve 1. A torsion spring 2 is fitted inside the sleeve 1. The front end of the torsion spring 2 has several rearwardly bent suspension plates 2-1 in the circumferential direction. Each suspension plate 2-1 hooks onto the outer circumferential surface of the front end of the sleeve 1. A protective sleeve 3 is fitted onto the outer side of the front end of the sleeve 1 to press each suspension plate 2-1 tightly against the outer circumferential surface of the front end of the sleeve 1, thereby fixing the torsion spring 2. A rearwardly facing shoulder 1-1 is provided on the outer circumferential surface of the front end of the sleeve 1. When the protective sleeve 3 is fitted onto the outer circumferential surface of the front end of the sleeve 1, it squeezes each suspension plate 2-1, causing the suspension plate 2-1 to deform and form a stop engagement with the shoulder 1-1 along the axial direction. The shoulder 1-1 stops the deformed suspension plate 2-1 from the front, preventing the torsion spring 2 from loosening forward. During insertion and removal, the torsion spring 2 needs to withstand a certain insertion and removal force. The shoulder 1-1 on the outer circumferential surface of the sleeve 1 stops and limits the suspension plate 2-1 from the front, preventing the torsion spring 2 from easily coming loose and ensuring connection reliability. Machining the shoulder 1-1 on the outer circumferential surface of the sleeve 1 forms an anti-loosening limiting structure, which is simple in structure, easy to manufacture, and the shoulder 1-1 is integrally formed with the sleeve 1 body, making the limiting of the torsion spring 2 more reliable. Of course, in other embodiments, the shoulder 1-1 may not be made on the outer circumferential surface of the sleeve 1. For example, a limiting ring can be welded to the outer circumferential surface of the sleeve 1 as an anti-loosening limiting structure, using the limiting ring to stop and limit the suspension plate 2-1 from the front.

[0025] The sleeve 1 has a forward-facing sheath positioning surface 1-2 at its front end, and the sheath 3 is fixed at the sheath positioning surface 1-2. For example... Figure 3 As shown, the sheath 3 includes a front large-diameter section 3-1, a rear small-diameter section 3-3, and a middle tapered section 3-2 that transitions between the front large-diameter section 3-1 and the rear small-diameter section 3-3. The front large-diameter section 3-1 and the rear small-diameter section 3-3 are respectively pressed against the front and rear sections of the suspension plate 2-1. The middle tapered section 3-2 is pressed against the middle of the suspension plate 2-1, causing the middle of the suspension plate 2-1 to bend inward and form a stop fit with the shoulder 1-1. This structure of the sheath 3 ensures that it has the largest possible pressing surface with the suspension plate 2-1, making the pressing of the suspension plate 2-1 more secure. Moreover, the pressing of the middle tapered section 3-2 against the middle of the suspension plate 2-1 makes the stop and limit between the deformed part of the middle of the suspension plate 2-1 and the shoulder 1-1 more reliable. The suspension plate 2-1 is less likely to break free from the pressing action of the sheath 3 and loosen forward, further improving the reliability of the anti-disengagement limit of the torsion spring 2. The shoulder 1-1 on the outer circumferential surface of the front end of the sleeve 1 also plays a certain role in preventing the sleeve 3 from slipping off.

[0026] In a more optimized design, the front end of the sheath 3 also has an inwardly turned-up flange 3-4, which presses against the front surface of the torsion spring 2. The diameter of the circle formed by the inwardly turned-up flange 3-4 is larger than the diameter of the insertion hole of the torsion spring 2. The inwardly turned-up flange 3-4 at the front end of the sheath 3 can stop the torsion spring 2 from the front, further improving the reliability of limiting the torsion spring 2. The diameter of the circle formed by the inwardly turned-up flange 3-4 is larger than the diameter of the insertion hole of the torsion spring 2, ensuring that the sheath 3 will not be hooked during the insertion and removal of the charging gun, thus preventing it from becoming loose. The inwardly turned-up flange 3-4 will also not cause interference or wear to the insulating cap on the charging gun pin or the pin contact itself. Of course, in other embodiments, the diameter of the circle formed by the inwardly turned-up flange 3-4 can also be equal to the diameter of the insertion hole of the torsion spring 2; the front end of the sheath 3 may also omit the inwardly turned-up flange 3-4.

[0027] The sheath 3 is riveted to the sleeve 1, making assembly convenient. Of course, other fixing methods can also be used, such as crimping or welding.

[0028] like Figure 1 As shown, the torsion spring 2 includes a front spring coil 2-2, a rear spring coil 2-4, and several spring strips 2-3 connecting the two spring coils. Several spring sheets are evenly distributed circumferentially on the front spring coil 2-2, and the spring sheets are bent backward to form a suspension plate 2-1. By cutting several spring sheets from the spring coil and bending them backward to form the suspension plate 2-1, compared with the structure where the front end of the spring strip 2-3 is directly bent backward to form the suspension plate 2-1, the suspension plate 2-1 has higher strength and is more reliably fixed after being pressed against the outer circumferential surface of the front end of the sleeve 1 by the sheath 3.

[0029] This utility model of a high-current torsion spring contact component utilizes the sheath 3 to press inward against the suspension plate 2-1 at the front end of the torsion spring 2, thereby limiting the torsion spring 2 to the upper limit of the sleeve 1. In addition, a shoulder 1-1 is provided on the outer circumferential surface of the front end of the sleeve 1. The shoulder 1-1 is used to stop the suspension plate 2-1 at the front end of the torsion spring 2 from the front side, further preventing the torsion spring 2 from loosening forward, thereby greatly improving the connection reliability.

[0030] Embodiment 2 of the high-current torsion spring contact of this utility model:

[0031] like Figure 4-6 As shown, the main difference between this embodiment and Embodiment 1 above lies in the structure of the sheath 3. In this embodiment, the length of the sheath 3 is less than the distance between the shoulder 1-1 and the positioning surface 1-2 of the sheath. The sheath 3 is a circular ring with equal diameters at all parts. After being assembled onto the sleeve 1, the sheath 3 is pressed against the rear section of each suspension piece 2-1. When the sheath 3 is assembled onto the sleeve 1, it squeezes each suspension piece 2-1, causing each suspension piece 2-1 to deform. Under the squeezing action of the sheath 3, the middle part of the suspension piece 2-1 bends inward, forming a stop fit with the shoulder 1-1 on the sleeve 1. The structure of the sheath 3 in this embodiment is simpler and easier to process. Other structures are the same as in Embodiment 1 above and will not be repeated here.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A high-current torsion spring contact, comprising a sleeve (1), a torsion spring (2) fitted inside the sleeve (1), the front end of the torsion spring (2) having a plurality of rearwardly bent suspension plates (2-1), each suspension plate (2-1) hooking onto the outer peripheral surface of the front end of the sleeve (1), and a sheath (3) fitted on the outer side of the front end of the sleeve (1) to press each suspension plate (2-1) tightly against the outer peripheral surface of the front end of the sleeve (1), characterized in that: The sleeve (1) has an anti-detachment limiting structure on the outer circumference of the front end. The anti-detachment limiting structure blocks the suspension plate (2-1) from the front to prevent the torsion spring (2) from loosening forward.

2. The high-current torsion spring contact element according to claim 1, characterized in that: The sleeve (1) has a rearward shoulder (1-1) on the outer peripheral surface of the front end, and the shoulder (1-1) constitutes the anti-detachment limiting structure.

3. The high-current torsion spring contact according to claim 1 or 2, characterized in that: The sleeve (1) has a forward-facing protective sleeve positioning surface (1-2) at the front end, and the protective sleeve (3) is fixed at the protective sleeve positioning surface (1-2). The length of the protective sleeve (3) is less than the distance between the anti-detachment limiting structure and the protective sleeve positioning surface (1-2).

4. The high-current torsion spring contact according to claim 1 or 2, characterized in that: The sheath (3) includes a front large-diameter section (3-1), a rear small-diameter section (3-3), and a middle tapered section (3-2) that transitions between the front large-diameter section (3-1) and the rear small-diameter section (3-3). The front large-diameter section (3-1) and the rear small-diameter section (3-3) are pressed against the front and rear sections of the suspension plate (2-1), respectively. The middle tapered section (3-2) is pressed against the middle of the suspension plate (2-1), causing the middle of the suspension plate (2-1) to bend inward and form a stop fit with the anti-slip limiting structure.

5. The high-current torsion spring contact element according to claim 4, characterized in that: The front end of the sheath (3) has an inner flange (3-4), which is pressed against the front end face of the torsion spring (2). The diameter of the circle formed by the inner flange (3-4) is greater than or equal to the diameter of the insertion hole of the torsion spring (2).

6. The high-current torsion spring contact according to claim 1 or 2, characterized in that: The sheath (3) is riveted to the sleeve (1).

7. The high-current torsion spring contact according to claim 1 or 2, characterized in that: The torsion spring (2) includes a front spring coil (2-2), a rear spring coil (2-4), and several spring strips (2-3) connected between the two spring coils. Several spring sheets are evenly distributed along the circumference on the front spring coil (2-2), and the spring sheets are bent backward to form the suspension sheet (2-1).

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