Spark plug sleeve with locking function

Abstract

The invention relates to a spark plug sleeve with a locking function, which comprises a sleeve main body and a clamping part arranged in the sleeve main body, one end of the sleeve main body is a knob head matched with a spiral part of a spark plug, and the other end of the sleeve main body is a connector connected with a wrench. A clamping part limiting structure is arranged in the sleeve main body close to the knob head; the clamping part is of a ring structure made of rubber, a plurality of radial clamping feet which are in discontinuous contact with the outer surface of the spark plug are arranged on the inner wall of the ring, the clamping feet are separated from one another, the radial inner end faces of the clamping feet define an inner hole for the spark plug to penetrate through, and the inner hole is provided with a clamping area with the diameter smaller than the outer diameter of a to-be-clamped part of the spark plug. The ring structure helps the clamping component to be uniformly expanded in the sleeve main body, and the inner wall of the ring is provided with the clamping feet which are discontinuously separated, so that the contact area between the clamping component and the spark plug is reduced, the influence on the clamping component is reduced, and the influence on the spark plug is also reduced.

Description

Technical Field

[0001] The present invention belongs to a disassembly and assembly tool, and particularly relates to a spark plug socket with a locking function. Background Art

[0002] As a professional tool for disassembling and installing spark plugs, the spark plug socket plays an important role in the field of automobile maintenance. With the continuous development of the automobile industry, the requirements for the performance and reliability of the spark plug socket are also increasing day by day.

[0003] In the design of traditional spark plug sockets, in order to achieve reliable clamping of the spark plug, methods such as magnetic attraction, rubber rings or elastic sheets are often used. However, these traditional methods all have certain defects.

[0004] For the magnetically attracted spark plug socket, although it can adsorb the spark plug by magnetic force, which facilitates the operation to a certain extent, the magnetic attraction is affected by various factors. For example, when there is oil, impurities on the surface of the spark plug or it works in a high-temperature environment, the magnetic attraction effect will be significantly weakened, resulting in the spark plug being easily detached from the socket during the disassembly or installation process, increasing the operation difficulty and risk of mistakes. In addition, magnetic attraction may also have a potential impact on the electrical performance of the spark plug, interfering with its normal ignition function.

[0005] The application of the rubber ring aims to use its elasticity to achieve tight wrapping and fixation of the spark plug. Moreover, the rubber ring has a loop structure and is tightened around the surface of the spark plug, with a large contact surface between the rubber ring and the spark plug. The high temperature of the spark plug is easily transmitted to the rubber ring, causing the rubber ring to become soft at high temperature, reducing its clamping force and affecting the use of the spark plug socket.

[0006] For the elastic sheet type spark plug socket, it relies on the elastic deformation of the elastic sheet to clamp the spark plug. However, the elastic sheet is made of metal material. When the spark plug is inserted, relative sliding occurs between the spark plug and the elastic sheet, which is likely to cause scratches on the surface of the spark plug and affect the operation of the spark plug. Moreover, the contact between the elastic sheet and the spark plug is a rigid contact. This rigid contact will form local stress concentration at the clamping part when clamping the spark plug, and this stress concentration may cause damage to the spark plug.

[0007] Therefore, there is an urgent need to develop a new spark plug socket to meet the needs of the automobile maintenance industry for efficient and stable tools. Summary of the Invention

[0008] The present invention solves the above-mentioned defects existing in the existing spark plug sockets, and provides a spark plug socket with a locking function. A rubber ring is arranged inside the socket body, and the structure of the rubber ring is improved. Radial clamping feet are arranged on the inner circumferential surface of the rubber ring. The radial end faces of the clamping feet are in contact with the spark plug and clamp the spark plug, thereby reducing the contact area between the rubber ring and the spark plug, reducing the influence on the rubber ring and also reducing the influence on the spark plug.

[0009] The present invention also provides a spark plug socket with a locking function. The width of the clamping feet of the rubber ring gradually increases and the inner diameter gradually decreases, and a radial clamping groove is formed in the part where the width increases. The clamping groove enables the clamping feet to adapt to the size and shape of the spark plug and also forms an anti-retreat contact between the clamping feet and the surface of the spark plug, improving the anti-dropping performance of the spark plug.

[0010] The present invention also provides a spark plug socket with a locking function. An elastic ring is embedded in the clamping feet of the rubber ring. The elastic ring has elastic feet that axially extend obliquely and radially incline inwards. Utilizing the elastic ability of the elastic ring and the elastic feet, the clamping force between the rubber ring and the spark plug is improved.

[0011] The specific technical solution of the present invention is: a spark plug socket with a locking function, including a socket body and a clamping component arranged inside the socket body. One end of the socket body is a knob head that cooperates with the spiral part of the spark plug, and the other end of the socket body is a connection head for connecting a wrench. A clamping component limiting structure is arranged at a position inside the socket body close to the knob head; the clamping component is a ring structure made of rubber, and a plurality of radial clamping feet that are intermittently in contact with the outer surface of the spark plug are arranged on the inner wall of the ring. The clamping feet are separated from each other, and the radial inner end faces of the clamping feet enclose an inner hole for the spark plug to pass through. The inner hole has a clamping area with a diameter smaller than the outer diameter of the part of the spark plug to be clamped.

[0012] The knob head at one end of the sleeve body is engaged with the spiral part of the spark plug, and the wrench is connected to the connector at one end of the sleeve body. By rotating the sleeve body, the spark plug can be rotated through the knob head. A clamping component is arranged inside the sleeve body. When the spark plug is inserted into the sleeve body and the spiral part of the spark plug is engaged with the knob head, the head of the spark plug penetrates into the clamping component, and the clamping component clamps the spark plug. A clamping component limiting structure is arranged inside the sleeve body to limit the clamping component and prevent the clamping component from axially moving. This clamping component limiting structure can be a convex ring structure or a surface with increased roughness. The clamping component is a ring structure made of rubber material. The rubber material itself has elasticity, which is convenient for the clamping component to be placed into the sleeve body. The contact between the rubber and the surface of the spark plug is a soft-hard contact, which will not damage the surface of the spark plug. The ring structure helps the clamping component to be evenly expanded inside the sleeve body. Clamping feet are arranged on the inner wall of the ring. The clamping feet are in contact with the outer surface of the spark plug. In this application, the clamping feet are arranged in an intermittent and separated structure, and each clamping foot independently contacts the outer surface of the spark plug through its respective radial inner end face. In this way, the contact area between the clamping component and the spark plug is reduced, the influence on the clamping component is reduced, and the influence on the spark plug is also reduced. The clamping component uses radially arranged clamping feet to clamp the spark plug. The clamping feet are radial, and the direction of the acting force generated by deformation is exactly in the radial direction. The acting force generated by deformation can act on the outer surface of the spark plug, improving the utilization rate of the acting force. At the same time, the clamping feet are separated from each other, which provides space for the circumferential deformation of the clamping feet, facilitating the clamping of a spark plug with an incorrect position or a deformed outer surface. After the clamping feet are separated from each other, once a problem occurs with one of the clamping feet, the influence will be limited to that clamping foot and will not affect the other clamping feet, especially the clamping feet in the adjacent parts. The spark plug penetrates into the inner hole, and the diameter of the clamping area of the inner hole is smaller than the outer diameter of the part of the spark plug to be clamped. In this way, the radial inner end faces of the clamping feet clamp the spark plug. The axial length of the clamping area is less than or equal to the axial length of the inner hole. If the axial length of the clamping area is equal to the axial length of the inner hole and the entire axial part of the inner hole is the clamping area, it means that the entire radial inner end faces of the clamping feet are in contact with the outer surface of the spark plug. If the axial length of the clamping area is less than the axial length of the inner hole, it means that the diameter of the part outside the clamping area of the inner hole is equal to or greater than the outer diameter of the part of the spark plug to be clamped, and the larger diameter facilitates the insertion of the spark plug.

[0013] Preferably, the knob head of the sleeve body adopts a spline tooth structure, and the connecting head adopts a square head structure; a first convex ring protruding radially inward is provided on the inner wall of the sleeve body near the spline teeth, and a clamping component embedding area is provided on the inner wall of the sleeve body on the side of the first convex ring closer to the connecting head. The inner diameter of the clamping component embedding area is larger than that of the first convex ring. The outer diameter of the clamping component is adapted to the inner diameter of the clamping component embedding area, and the inner diameter of the first convex ring is larger than the diameter of the inner hole. The knob head adopting a spline tooth structure facilitates the cooperation with the spiral part of the spark plug; the clamping component embedding area inside the sleeve body is used to install the clamping component. The clamping component is held in the clamping component embedding area by the frictional force generated by its own radial elastic force, ensuring that the clamping component will not move axially. A first convex ring is provided between the clamping component embedding area and the knob head. After the clamping component is installed, it is limited by the first convex ring. The inner diameter of the first convex ring does not affect the passage of the spark plug. When the spark plug is withdrawn, the clamping component still remains in the clamping component embedding area.

[0014] Preferably, a second convex ring protruding radially inward is further provided inside the sleeve body. The second convex ring and the first convex ring are located at both ends of the clamping component embedding area. The inner diameter of the clamping component embedding area is larger than that of the second convex ring, and the inner diameter of the second convex ring is larger than the diameter of the inner hole. The second convex ring is provided inside the sleeve body. The second convex ring is located at the other end of the clamping component embedding area and also limits the clamping component, preventing the clamping component from moving axially when the spark plug is inserted. The second convex ring and the first convex ring cooperate to limit the axial two ends of the clamping component.

[0015] Preferably, the clamping component has a circular ring structure, the cross-section of the clamping foot is rectangular, the radially inner end surface of the clamping foot is flat, the axial thickness of the clamping foot is equal, and the two axial side edges of the radially inner end surface of the clamping foot are rounded. The clamping foot is rectangular, which is convenient for processing. The rectangular radiality is better, making the clamping foot generate a radially accurate force; the radially inner end surface of the clamping foot is flat, so that after contacting the outer surface of the spark plug, it will produce extrusion deformation to ensure effective clamping, and it can ensure that there is always a part in this plane in contact with the spark plug. The two side edges of the radially inner end surface are rounded to improve the safety of the clamping foot. Preferably, the radial heights of the clamping feet are equal, the inner hole surrounded by the radially inner end surface of the clamping feet is cylindrical, and the entire radially inner end surface of the clamping feet forms the clamping area.

[0016] Or the radial heights of the clamping feet are variable, the inner hole surrounded by the radially inner end surface of the clamping feet is conical, and the axial length of the clamping area is at least 1 / 2 of the axial length of the clamping feet. The inner hole is conical, and the large-diameter end faces the knob head side of the sleeve body, which is convenient for the insertion of the spark plug.

[0017] As a preferred embodiment, the clamping component is a circular ring structure, the cross section of the clamping foot is rectangular, the thickness of the clamping foot is variable, the radial height of the clamping foot is variable, the thickness and radial height of the end of the clamping foot that is biased towards the connector are the largest, the inner hole surrounded by the radial inner end face of the clamping foot is conical, and the radial inner end face of the clamping foot corresponding to the clamping area is in a radially convex arc shape. The thickness of the clamping foot in the clamping area increases, and the radial inner end face of the clamping foot in the clamping area is in an arc shape, the diameter of the arc is consistent with the aperture of the inner hole, as the spark plug is inserted, the arc is stretched open, and the two side edges of the radial inner end face of the clamping foot are folded circumferentially, so that the radial inner end face of the clamping foot has more inclusive contact surfaces, and the radial inner end face of the clamping foot forms a conical contact surface after contacting the outer surface of the spark plug, and the two side edges are at an angle relative to the axis of the spark plug, thereby improving the centering of the spark plug, improving the stability of the spark plug clamping, and also increasing the spark plug anti-slip resistance to prevent the spark plug from falling out.

[0018] Preferably, a cavity is provided inside the clamping foot, and one end of the cavity facing the connector is open. The cavity inside the clamping foot improves the deformation capacity of the radial inner end surface of the clamping foot. In order to improve the contact fit, a convex point can be provided on the radial inner end surface of the clamping foot.

[0019] Preferably, the clamping foot is provided with a clamping groove with an opening, the clamping groove is triangular, the opening of the clamping groove faces one side of the connector, and the axial length range of the clamping groove corresponds to the range of the clamping area. The clamping groove greatly improves the deformation capacity of the radial inner end surface of the clamping foot, and it is easy to be stretched open after contacting the outer surface of the spark plug. At the same time, the groove edge of the clamping groove forms a radial and circumferential composite clamping with the outer surface of the spark plug, so that the clamping groove and the outer surface of the spark plug form a stop contact, thereby improving the anti-drop performance.

[0020] Preferably, an elastic ring is embedded in the clamping foot, and the elastic ring is in a ring shape, and the position of the elastic ring is where the clamping area is located. The elastic ring is generally made of metal, and has greater elastic deformation than the rubber clamping foot, but the elastic ring does not directly contact the surface of the spark plug, and will not damage the surface of the spark plug on the basis of improving the clamping force of the clamping foot; if the elastic force of the rubber decreases, the elastic ring can also provide sufficient clamping force to prevent the spark plug from falling out, thereby ensuring the safety of the spark plug.

[0021] Preferably, two elastic feet with acute angles are arranged on the side of the elastic ring, and the two elastic feet are located on both sides of the clamping groove in the clamping foot, and the ends of the elastic feet are radially inwardly inclined relative to the elastic ring body. The elastic feet extend to both sides of the clamping groove to provide elastic reinforcement to the radial inner end faces of the clamping feet on both sides of the clamping groove.

[0022] The beneficial effects of the present invention are as follows: 1. The loop structure helps the clamping component to be evenly expanded inside the sleeve body. The clamping feet are arranged discontinuously and separately on the inner wall of the loop, reducing the contact area between the clamping component and the spark plug, reducing the influence on the clamping component and also reducing the influence on the spark plug; 2. The clamping feet are radially shaped, and the direction of the acting force generated by deformation is exactly in the radial direction. The acting force generated by deformation can act on the outer surface of the spark plug, improving the utilization rate of the acting force. At the same time, the clamping feet are separated from each other, providing space for the circumferential deformation of the clamping feet, which is beneficial for clamping spark plugs with incorrect positions or deformed outer surfaces; 3. After the clamping feet are separated from each other, there will be no linkage influence between them, ensuring the clamping safety of the clamping component; 4. The setting of the clamping component embedding area and the first convex ring improves the stability of the clamping component; 5. The clamping groove enables the clamping feet to change according to the size and shape of the spark plug. The clamping groove also forms an anti-withdrawal contact between the clamping feet and the surface of the spark plug, improving the anti-falling performance of the spark plug; 6. An elastic ring is embedded in the clamping feet of the rubber ring. The elastic ring has elastic feet. By using the elastic ability of the elastic ring and the elastic feet, the clamping force between the rubber ring and the spark plug is improved. Description of the Drawings

[0023] Figure 1 is an axial sectional view of one embodiment of the present invention; Figure 2 is an axial view of the connection head of the sleeve body of the present invention; Figure 3 is an axial view of the knob head of the sleeve body of the present invention; Figure 4 is a structural view of one clamping component of the present invention; Figure 5 is a structural view of the second clamping component of the present invention; Figure 6 is a structural view of the third clamping component of the present invention; Figure 7 is a structural view of the fourth clamping component of the present invention; Figure 8 is of the present invention Figure 7 shown sectional view of the clamping component; Figure 9 is a structural view of an elastic ring of the present invention; In the figures: 1. Sleeve body, 2. Clamping component embedding area, 3. Clamping component, 4. First convex ring, 5. Knob head, 6. Second convex ring, 7. Connection head, 8. Groove, 9. Clamping foot, 10. Inner hole, 11. Radial inner end face, 12. Clamping groove, 13. Cavity, 14. Elastic ring, 15. Elastic foot. Detailed Implementation Modes

[0024] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings. Embodiment 1:

[0025] As Figure 1 、 Figure 2 、 Figure 3 shown, a spark plug socket with a locking function includes a socket body 1 and a clamping component 3 arranged inside the socket body. The socket body is in the shape of a cylindrical rod, with a through hole penetrating both ends at the axis part. One end of the socket body is a knob head 5 that cooperates with the spiral part of the spark plug, and the other end of the socket body is a connection head 7 for connecting a wrench. The knob head of the socket body adopts a spline tooth structure, and the connection head adopts a square head structure. Grooves 8 are arranged on four side surfaces of the inner wall of the connection head. Knurling is provided on the outer surface of the socket body corresponding to the connection head.

[0026] A first convex ring 4 with a radially inward protrusion is arranged inside the socket body near the knob head. The cross-section of the first convex ring is trapezoidal, and both axial side surfaces of the first convex ring are conical surfaces. The first convex ring forms a circular hole inside the socket body. A clamping component embedding area 2 is arranged inside the socket body on the side of the first convex ring closer to the connection head. The inner diameter of the clamping component embedding area is larger than the diameter of the circular hole, and the diameter of the circular hole is smaller than the inscribed circle diameter of the knob head. A second convex ring 6 is arranged at the other end of the socket body corresponding to the clamping component embedding area. The second convex ring forms a circular hole inside the socket body, and the diameter of the circular hole formed by the second convex ring is smaller than the inner diameter of the clamping component embedding area. The first convex ring and the second convex ring form a clamping component limiting structure inside the socket body.

[0027] The clamping component 3 is arranged in the clamping component embedding area inside the socket body. As Figure 4 shown, the clamping component is a circular ring structure made of rubber. A plurality of radially arranged clamping feet 9 for intermittently contacting the outer surface of the spark plug are arranged on the inner wall of the ring. The clamping feet are separated from each other in the circumferential direction inside the ring. The radially inner end surfaces 11 of the clamping feet enclose an inner hole 10 for the spark plug to pass through. The cross-section of the clamping feet is rectangular, and the radial heights are equal. The inner hole enclosed by the radially inner end surfaces of the clamping feet is cylindrical. The inner diameter of the clamping area formed by the entire radially inner end surface is smaller than the outer diameter of the part of the spark plug to be clamped. The radially inner end surfaces of the clamping feet are flat, the axial thicknesses of the clamping feet are equal, and the two axial side edge parts of the radially inner end surfaces of the clamping feet are in fillet transition. In this embodiment, there are 8 clamping feet inside the ring, and the 8 clamping feet are evenly distributed in the circumferential direction.

[0028] The grounding nut of the spark plug is inserted from the knob head end of the socket body, passes through the inner hole of the clamping component, and then the radially inner end surface of the clamping foot contacts and clamps the spark plug, and the inner wall of the spline teeth of the knob head cooperates with the hexagonal spiral part of the spark plug. Embodiment 2:

[0029] The difference between this embodiment and Embodiment 1 lies in the structure of the clamping component. As Figure 5 shown, the thick bottom of the clamping feet is equal along the axial direction, the height of the clamping feet is variable, the height of the clamping feet gradually increases from one end to the other end, the inner hole 10 surrounded by the radial inner end faces 11 of the clamping feet is conical, the diameter of the large diameter end of the conical inner hole is larger than the outer diameter of the part of the spark plug to be clamped, the diameter of the small diameter end of the conical inner hole is smaller than the outer diameter of the part of the spark plug to be clamped, the part where the diameter at the inner hole is smaller than the outer diameter of the part of the spark plug to be clamped forms a clamping area, and the axial length of the clamping area is at least 1 / 2 of the axial length of the clamping feet. After the clamping component is installed on the sleeve body, the small diameter end of the inner hole faces the connecting head end of the sleeve body. Embodiment 3:

[0030] The difference between this embodiment and Embodiment 1 lies in the structure of the clamping component. As Figure 6 shown, the thick bottom of the clamping feet is variable along the axial direction, the thickness of the clamping feet gradually increases from one end to the other end, the height of the clamping feet is variable, the height of the clamping feet gradually increases from one end to the other end, the end with a smaller thickness and the end with a smaller height are the same end, the inner hole 10 surrounded by the radial inner end faces 11 of the clamping feet is conical, the diameter of the large diameter end of the conical inner hole is larger than the outer diameter of the part of the spark plug to be clamped, the diameter of the small diameter end of the conical inner hole is smaller than the outer diameter of the part of the spark plug to be clamped, the part where the diameter at the inner hole is smaller than the outer diameter of the part of the spark plug to be clamped forms a clamping area, and the axial length of the clamping area is at least 1 / 2 of the axial length of the clamping feet. The radial inner end face of the clamping area is in an arc shape that bulges radially outward. After the clamping component is installed on the sleeve body, the small diameter end of the inner hole faces the connecting head end of the sleeve body. Embodiment 4:

[0031] The difference between this embodiment and Embodiment 3 lies in the structure of the clamping component. As Figure 7 , Figure 8 shown, a cavity 13 is arranged inside the clamping feet, the cavity is open towards the end with the largest thickness of the clamping feet, and the axial length of the cavity corresponds to the range of the clamping area.

[0032] Furthermore, a clamping groove 12 to be opened is arranged on the radial inner end face of the clamping feet, the clamping groove is triangular, the clamping groove is communicated with the cavity inside the clamping feet, the opening of the clamping groove and the opening of the cavity are at the same end, and the axial length range of the clamping groove is smaller than the axial length of the cavity. Embodiment 5:

[0033] On the basis of Embodiment 4, an elastic ring 14 is arranged inside the clamping feet. As Figure 9As shown, the elastic ring is annular in shape, and the position of the elastic ring is at the position where the clamping area is located. The axial length of the elastic ring is less than the axial length of the cavity. Two elastic feet 15 forming an acute angle are provided on the side of the elastic ring. The two elastic feet are respectively located on both sides of the clamping groove within the clamping feet, and the end portions of the elastic feet are radially inclined inwards relative to the elastic ring body. The position of the elastic ring is outside the clamping groove, and the clamping groove is between the two elastic feet.

[0034] The above are only the preferred embodiments of the present invention and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent transformations made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A spark plug socket with a locking function, characterized in that, It includes a sleeve body (1) and a clamping component (3) arranged inside the sleeve body. One end of the sleeve body is a knob head (5) that mates with the helical part of the spark plug, and the other end of the sleeve body is a connection head (7) for connecting a wrench. A clamping component limiting structure is arranged at a position inside the sleeve body close to the knob head; the clamping component is a ring structure made of rubber, and several clamping feet (9) that are radial and intermittently contact the outer surface of the spark plug are arranged on the inner wall of the ring. The clamping feet are separated from each other, and the radial inner end surfaces of the clamping feet enclose an inner hole (10) for the spark plug to pass through. The inner hole has a clamping area with a diameter smaller than the outer diameter of the part of the spark plug to be clamped.

2. The spark plug socket with a locking function according to claim 1, wherein The knob head of the sleeve body adopts a spline tooth structure, and the connection head adopts a square head structure; a first convex ring (4) that protrudes radially inward in a circle is arranged on the inner wall of the sleeve body close to the spline teeth. The inner wall of the sleeve body on the side of the connection head where the first convex ring is biased is provided with a clamping component embedding area. The inner diameter of the clamping component embedding area is larger than the inner diameter of the first convex ring. The outer diameter of the clamping component is adapted to the inner diameter of the clamping component embedding area. The inner diameter of the first convex ring is larger than the diameter of the inner hole.

3. The spark plug socket with a locking function according to claim 2, wherein, A second convex ring (6) that protrudes radially inward in a circle is also arranged inside the sleeve body. The second convex ring and the first convex ring are located at both ends of the clamping component embedding area. The inner diameter of the clamping component embedding area is larger than the inner diameter of the second convex ring. The inner diameter of the second convex ring is larger than the diameter of the inner hole.

4. A spark plug socket with a locking function according to claim 1, wherein, The clamping component is a circular ring structure. The cross-section of the clamping foot is rectangular. The radial inner end surface (11) of the clamping foot is flat. The axial thicknesses of the clamping feet are equal. The two axial side edges of the radial inner end surface of the clamping foot are in fillet transition.

5. A spark plug socket with a locking function according to claim 4, characterized in that, The radial heights of the clamping feet are equal. The inner hole enclosed by the radial inner end surfaces of the clamping feet is cylindrical. The entire radial inner end surface of the clamping feet forms the clamping area; or the radial heights of the clamping feet are variable. The inner hole enclosed by the radial inner end surfaces of the clamping feet is conical. The axial length of the clamping area is at least 1 / 2 of the axial length of the clamping feet.

6. A spark plug socket with a locking function according to claim 1, characterized in that, The clamping component is a circular ring structure. The cross-section of the clamping foot is rectangular. The thickness of the clamping foot is variable. The radial height of the clamping foot is variable. The thickness and radial height of the end of the clamping foot biased towards the connection head are the largest. The inner hole enclosed by the radial inner end surfaces of the clamping feet is conical. The radial inner end surface of the clamping foot corresponding to the clamping area is in an arc shape that protrudes radially outward. The axial length of the clamping area is at least 1 / 2 of the axial length of the clamping feet.

7. The spark plug socket with a locking function according to claim 6, characterized in that, A cavity (13) is arranged inside the clamping foot. One end of the cavity facing the connection head is open.

8. A spark plug socket with a locking function according to claim 6 or 7, characterized in that, A clamping groove (12) with an opening is arranged on the clamping foot. The clamping groove is triangular. The opening of the clamping groove faces the connection head side. The axial length range of the clamping groove corresponds to the range of the clamping area.

9. The spark plug socket with a locking function according to claim 8, characterized in that, An elastic ring (14) is embedded in the clamping foot. The elastic ring is in a ring shape. The position of the elastic ring is at the position of the clamping area.

10. A spark plug socket with a locking function according to claim 8, characterized in that, Two elastic feet (15) that form an acute angle are arranged on the side of the elastic ring. The two elastic feet are located on both sides of the clamping groove inside the clamping foot. The ends of the elastic feet are radially inclined inward relative to the elastic ring body.

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