A grounding structure for a charging station

Abstract

The invention discloses a grounding structure for a charging seat, which relates to the field of automobile technology, and comprises a grounding nut, a welding stud and a grounding terminal, wherein the grounding terminal is sleeved on the welding stud through a grounding hole; the welding stud is connected to the grounding nut through a thread; a backstop clamp is also arranged between the grounding nut and the welding stud, and the welding stud is threadedly connected to the grounding nut after passing through the backstop clamp, and the backstop clamp has a card that abuts and cooperates with the screw rod of the welding stud to prevent the grounding nut from loosening; after the connection part is tightened, the backstop clamp structure in the grounding nut will be deformed when cooperating with the screw rod of the welding stud, and its center position will deform upward, thereby clamping the external thread of the welding stud, limiting the relative displacement of the welding stud and the grounding nut, and ensuring that the grounding nut is not loosened.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, and in particular to a grounding structure for a charging base. Background Art

[0002] The grounding point structure of new energy vehicles (the fixed point where the electrical components are connected to the vehicle body to form a current loop) is usually made of a grounding nut with a welded stud (see Figure 1 ). Its component structure includes a grounding terminal 101, a welding nut 102, a grounding stud 103 and a perforated sheet metal 104.

[0003] However, it was found during a long period of use test that the vibration caused by the driving of the car caused the locking between the welding nut 102 and the grounding stud 103 to loosen, and eventually caused the grounding terminal 101 to loosen. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a new grounding structure, in which an anti-loosening structure is arranged to make the fixed connection between the nut and the stud more stable.

[0005] The specific scheme provided by the present invention is as follows:

[0006] A grounding structure for a charging stand comprises a grounding nut, a welding stud and a grounding terminal, wherein the grounding terminal is sleeved on the welding stud through a grounding hole; the welding stud is connected to the grounding nut through a thread; a backstop clamp is also provided between the grounding nut and the welding stud, and the welding stud is threadedly connected to the grounding nut after passing through the backstop clamp, and the backstop clamp has a card that abuts and cooperates with the screw rod of the welding stud to prevent the grounding nut from loosening.

[0007] Furthermore, the grounding nut includes a screw plug and a base;

[0008] The screw plug comprises a cover portion and a connecting portion, wherein the connecting portion is provided with an internal thread matched with the screw rod of the welding stud;

[0009] The base is provided with a through hole, the through hole includes a first hole position and a second hole position, the diameter of the first hole position is larger than the diameter of the second hole position to form a limiting step;

[0010] The anti-retraction clamp ring is placed on the limiting step; the connecting portion of the screw plug is inserted and fixed to the first hole, and the anti-retraction clamp ring abuts against the limiting step.

[0011] Furthermore, the cover portion is a disc, and the connecting portion is a cylinder with an internal thread.

[0012] Furthermore, the grounding nut also includes a hexagonal flange head, and the base and the hexagonal flange head are respectively fixed to the left and right end surfaces of the screw plug.

[0013] Furthermore, the hexagonal flange head, the screw plug and the base are coaxial.

[0014] Furthermore, the outer circumferential surface of the connecting portion is provided with an external thread, the hole wall of the first hole position is provided with an internal thread, and the connecting portion is threadedly connected to the first hole position.

[0015] Furthermore, the outer diameter of the anti-retraction clamp is adapted to the diameter of the first hole; a gap is formed between each two adjacent cards, and the cards are radially arranged on the anti-retraction clamp to form a center hole; the diameter of the center hole is smaller than the diameter of the second hole, and the screw of the welding stud is interference fit with the center hole when inserted into the center hole.

[0016] Furthermore, a welding ring is provided on the welding head of the welding stud, and the welding ring extends in the length direction of the screw rod;

[0017] The welding stud is fixed to the perforated sheet metal by welding through the welding ring.

[0018] The beneficial effects achieved by adopting this technical solution are:

[0019] 1. The patent of this invention adopts the structure of welding stud + grounding nut. A circular welding ring is set on the welding stud to replace the spot welding part of the prior art, ensuring the sealing with the sheet metal after welding and ensuring that the grounding point does not leak.

[0020] 2. After the connection part is tightened, the retaining ring structure in the grounding nut will deform when it cooperates with the screw of the welding stud, and its center position will deform upward, thereby clamping the external thread of the welding stud, limiting the relative displacement of the welding stud and the grounding nut, and ensuring that the grounding nut does not loosen;

[0021] 3. The screw plug and retaining ring structure of the grounding nut are replaceable structures. Screw plugs and retaining rings with different thread specifications can be selected for welding studs of different specifications to achieve standardization under the premise that the base remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a grounding structure in the prior art.

[0023] Figure 2 The grounding structure provided for this solution.

[0024] Figure 3 This is a cross-sectional view of the grounding structure of this scheme.

[0025] Figure 4This is a diagram of the matching structure of the grounding nut and the retaining ring.

[0026] Figure 5 This is the plan structure diagram of the grounding nut.

[0027] Figure 6 This is a three-dimensional structural diagram of the welding stud.

[0028] Figure 7 It is a plan view of the matching structure of the welding stud and the retaining ring.

[0029] Among them: 10 grounding nut, 11 screw plug, 12 base, 13 hexagonal flange head, 20 welding stud, 21 welding ring, 30 grounding terminal, 40 retaining clamp, 41 card, 42 center hole, 102 welding nut, 103 grounding stud, 111 cover part, 112 connecting part, 121 first hole position, 122 second hole position. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] The present embodiment provides a grounding structure for a charging stand. By utilizing the grounding structure, the anti-loosening prevention between the welding stud and the grounding nut can be effectively achieved. At the same time, through further design of the welding stud, a circular welding ring is designed to achieve fully sealed welding with the open hole sheet metal, replacing the spot welding parts of the prior art, thereby ensuring the sealing of the welding position and avoiding water leakage.

[0032] In this proposal, see Figure 2 - Figure 3 The grounding structure provided includes a grounding nut 10, a welding stud 20 and a grounding terminal 30, which is different from the traditional design. The traditional scheme is composed of a grounding stud 103, a welding nut 102 and a grounding terminal 30. The welding nut 102 is threadedly connected to the grounding stud 103 and the welding nut 102 is fixed on the open sheet metal. However, in this scheme, the opposite structural design is adopted, that is, the welding stud 20 is welded and fixed on the open sheet metal, and then the grounding nut 10 is used to achieve spiral fixation.

[0033] Specifically, the solution provided in this embodiment is that the grounding terminal 30 is sleeved on the welding stud 20 through the grounding hole; the welding stud 20 is connected to the grounding nut 10 through a thread; a back-stop clamp 40 is also provided between the grounding nut 10 and the welding stud 20, and the welding stud 20 is threadedly connected to the grounding nut 10 after passing through the back-stop clamp 40, and the back-stop clamp 40 has a card 41 that abuts and cooperates with the screw rod of the welding stud 20 to prevent the grounding nut 10 from loosening.

[0034] In order to introduce the specific working principle of this solution in detail, the following is a specific embodiment as a principle explanation;

[0035] When the present grounding structure is used for installation, the welding stud 20 needs to be passed through the perforated sheet metal first, and the welding head of the welding stud 20 is welded and fixed to the perforated sheet metal, and then the grounding terminal 30 is sleeved on the welding stud 20 through its own grounding hole; then the anti-retraction clamping ring 40 is installed in the grounding nut 10, and the grounding nut 10 and the welding stud 20 are screwed together and fixed. During the continuous tightening process, the card 41 in the anti-retraction clamping ring 40 gradually rises and abuts against the thread of the welding stud 20 until the grounding nut 10 and the welding stud 20 are completely tightened. At this time, the grounding terminal 30 is more stably fixed on the open sheet metal under the dual action of the abutment force of the anti-retraction clamping ring 40 and the tightening force between the grounding nut 10 and the welding stud 20; of course, if the car vibrates, because the card 41 on the anti-retraction clamping ring 40 is always abutted and connected with the thread of the welding stud 20, the possibility of relative looseness between the welding stud 20 and the grounding nut 10 is effectively reduced.

[0036] In this proposal, see Figure 6 A welding ring 21 is also provided on the welding head of the welding stud 20, and the welding ring 21 extends in the length direction of the screw; by providing the welding ring 21 here, when the welding stud 20 and the open hole sheet metal are welded and fixed, the traditional spot welding method can be abandoned, and the welding ring 21 can be used to achieve comprehensive sealing welding, so that the connection between the welding stud 20 and the open hole sheet metal is sealed to avoid water leakage.

[0037] In order to ensure that the retaining ring 40 can be stably installed in the grounding nut 10 , the present solution makes a specific design for the component structure of the grounding nut 10 , that is, the grounding nut 10 includes a screw plug 11 and a base 12 .

[0038] Among them, see Figure 4-Figure 5 The screw plug 11 includes a cover portion 111 and a connecting portion 112, and the connecting portion 112 is provided with an internal thread that matches the screw rod of the welding stud 20; a through hole is provided in the base 12, and the through hole includes a first hole position 121 and a second hole position 122, and the diameter of the first hole position 121 is larger than the diameter of the second hole position 122 to form a limiting step; the retaining clamp 40 can be placed on the limiting step; the connecting portion 112 of the screw plug 11 is inserted and fixed to the first hole position 121, and the retaining clamp 40 abuts against the limiting step.

[0039] It can be understood that when performing combined installation, the anti-retraction clamp 40 is placed on the limit step, and then the connecting part 112 of the screw plug 11 is inserted into the first hole 121, and at the same time, the internal thread in the connecting part 112 is screwed and fixed with the external thread of the welding stud 20. During the screwing process, the connecting part 112 abuts against the anti-retraction clamp 40 so that the middle part of the card 41 gradually rises and abuts against the external thread of the welding stud 20.

[0040] Optionally, the cover portion 111 is a disc, and the connecting portion 112 is a cylinder with an internal thread.

[0041] In order to improve convenience and to be able to replace the grounding nut 10 according to welding studs of different specifications, the outer cylindrical surface of the connecting portion 112 in this solution is provided with an external thread, and the hole wall of the first hole position 121 is provided with an internal thread, and the connecting portion 112 is threadedly connected with the first hole position 121.

[0042] Optionally, the grounding nut 10 further includes a hexagonal flange head 13, and the base 12 and the hexagonal flange head 13 are respectively fixed to the left and right end surfaces of the screw plug 11; and the hexagonal flange head 13, the screw plug 11 and the base 12 are coaxial.

[0043] In this proposal, see Figure 3-Figure 4 , Figure 7 The anti-retraction clamp 40 is a main component to prevent loosening, and its structure is introduced in detail here. Specifically, the outer diameter of the anti-retraction clamp 40 is adapted to the diameter of the first hole 121; a gap is formed between each two adjacent cards 41, and the cards 41 are radially arranged on the anti-retraction clamp 40 to form a center hole 42; the diameter of the center hole 42 is smaller than the diameter of the second hole 122, and the screw of the welding stud 20 is interference fit with the center hole 42 when inserted into the center hole 42.

[0044] In this way, when the welding stud 20 and the grounding nut 10 are spirally locked, the card 41 will be deformed upward due to the welding stud 20 and finally abut against the welding stud 20, effectively further reinforcing the stability of the connection between the welding stud 20 and the grounding nut 10.

[0045] Therefore, in summary, the effects achieved by adopting this technical solution include at least the following points.

[0046] 1. The patent of this invention adopts the structure of welding stud + grounding nut. A circular welding ring is set on the welding stud to replace the spot welding part of the prior art, ensuring the sealing with the sheet metal after welding and ensuring that the grounding point does not leak.

[0047] 2. After the connection part is tightened, the retaining ring structure in the grounding nut will deform when it cooperates with the screw of the welding stud, and its center position will deform upward, thereby clamping the external thread of the welding stud, limiting the relative displacement of the welding stud and the grounding nut, and ensuring that the grounding nut does not loosen;

[0048] 3. The screw plug and retaining ring structure of the grounding nut are replaceable structures. Screw plugs and retaining rings with different thread specifications can be selected for welding studs of different specifications to achieve standardization under the premise that the base remains unchanged.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A grounding structure for a charging stand, comprising a grounding nut (10), a welding stud (20) and a grounding terminal (30), wherein the grounding terminal (30) is sleeved on the welding stud (20) through a grounding hole; the welding stud (20) and the grounding nut (10) are connected by threads; characterized in that: A back-stop ring (40) is also provided between the grounding nut (10) and the welding stud (20); the welding stud (20) is threadedly connected to the grounding nut (10) after passing through the back-stop ring (40); the back-stop ring (40) has a card (41) that abuts against the screw of the welding stud (20) to prevent the grounding nut (10) from loosening; The grounding nut (10) comprises a screw plug (11) and a base (12); The screw plug (11) comprises a cover portion (111) and a connecting portion (112), wherein the connecting portion (112) is provided with an internal thread that matches the screw rod of the welding stud (20); The base (12) is provided with a through hole, the through hole comprising a first hole position (121) and a second hole position (122), the diameter of the first hole position (121) being larger than the diameter of the second hole position (122) to form a limiting step; The anti-retraction clamp ring (40) is placed on the limiting step; the connecting portion (112) of the screw plug (11) is plugged and fixed to the first hole (121) while the anti-retraction clamp ring (40) abuts against the limiting step.

2. A grounding structure for a charging station according to claim 1, characterized in that: The cover portion (111) is a disc, and the connecting portion (112) is a cylinder with internal threads.

3. A grounding structure for a charging stand according to claim 1 or 2, characterized in that: The grounding nut (10) further comprises a hexagonal flange head (13), and the base (12) and the hexagonal flange head (13) are respectively fixed to the left and right end surfaces of the screw plug (11).

4. The grounding structure for a charging stand according to claim 3, characterized in that: The hexagonal flange head (13), the screw plug (11) and the base (12) are coaxial.

5. The grounding structure for a charging stand according to claim 1, characterized in that: The outer circumferential surface of the connecting portion (112) is provided with an external thread, the hole wall of the first hole position (121) is provided with an internal thread, and the connecting portion (112) is threadably connected to the first hole position (121).

6. The grounding structure for a charging station according to claim 1, characterized in that: The outer diameter of the anti-retraction clamp (40) is adapted to the diameter of the first hole position (121); a gap is formed between each two adjacent cards (41), and the cards (41) are radially arranged on the anti-retraction clamp (40) to form a center hole (42); the diameter of the center hole (42) is smaller than the diameter of the second hole position (122), and when the screw of the welding stud (20) is inserted into the center hole (42), it has an interference fit with the center hole (42).

7. The grounding structure for a charging station according to claim 1, characterized in that: A welding ring (21) is also provided on the welding head of the welding stud (20), and the welding ring (21) extends in the length direction of the screw rod; The welding stud (20) is welded and fixed to the perforated sheet metal via the welding ring (21).

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