Three-piece spark plug shell

Abstract

This utility model belongs to the field of spark plug sleeves, specifically a three-section spark plug sleeve, including a front rod, a rear rod, and a connecting rod. A sleeve head is fixed to the bottom end of the front rod. Both the front and rear rods have through cavities. A U-shaped groove communicating with the cavity is formed at one end of each of the front and rear rods. Both ends of the connecting rod rotate within the U-shaped grooves on the front and rear rods, respectively. Limiting mechanisms are provided at both ends of the outer wall of the connecting rod. Through the three-section structural design of the front rod, rear rod, and U-shaped groove, the overall length of the device can be adjusted according to usage requirements, eliminating the need to disassemble the engine when replacing spark plug wear parts, reducing the difficulty of replacement, improving work efficiency, and facilitating carrying and storage.

Description

Technical Field

[0001] This utility model relates to the field of spark plug sleeves, specifically a three-section spark plug sleeve. Background Technology

[0002] Water-cooled engines are widely used in motorcycles, small generator sets, garden machinery, and other equipment due to their high heat dissipation efficiency and strong operational stability. Spark plugs, as a core consumable component of the engine ignition system, directly affect the engine's power output and combustion efficiency, requiring regular replacement (typically every 5,000-10,000 kilometers or 200 hours of operation). Therefore, convenient spark plug replacement is crucial for the daily maintenance of equipment. Currently, the main spark plug removal tool is an integrated straight rod socket. Its structure typically includes a socket head for fitting the spark plug head, a rigid straight rod for transmitting torque, and a handle. These three components are either integrally formed or fixedly connected. This type of tool can be used normally in conventional engines (such as air-cooled engines with ample space at the top of the cylinder head and a large distance between the frame and the cylinder head): the socket head is inserted into the spark plug mounting hole in the cylinder head via the straight rod, and the handle applies a turning torque to complete the removal or installation.

[0003] However, most existing water-cooled engine spark plugs have a deep cut at the top of the cylinder head, and the distance between the chassis and the cylinder head is relatively close. Traditional spark plug wrenches cannot be used to remove them, and spark plug wrenches are too long to be convenient to use, which is not conducive to the replacement of easily damaged spark plug parts. Therefore, a three-section spark plug socket is proposed to address the above situation. Utility Model Content

[0004] To address the problems of existing spark plug wrenches being unable to be disassembled, being too long and inconvenient to use, and hindering the replacement of easily damaged spark plug parts, this utility model proposes a three-section spark plug sleeve.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a three-section spark plug sleeve, including a front end rod, a rear end rod and a connecting rod, wherein a sleeve head is fixed at the bottom end of the front end rod, and a cavity is opened through the front end rod and the rear end rod, and a U-shaped groove communicating with the cavity is opened at one end of the corresponding front end rod and the rear end rod.

[0006] The two ends of the connecting rod rotate within the U-shaped grooves on the front and rear ends of the rod, respectively, and both ends of the outer wall of the connecting rod are provided with limit mechanisms.

[0007] Preferably, a rotating shaft is rotatably mounted on the U-shaped groove, and the connecting rod is a hollow rod with circular openings at both ends. One end of the connecting rod has an assembly port that is interference-fitted with the rotating shaft.

[0008] Preferably, the limiting mechanism includes a fixed ring and a threaded ring, the fixed ring being fixed to the outer wall of the connecting rod, and a limiting groove being formed on the fixed ring.

[0009] Preferably, the threaded ring is threaded onto the outer wall of the connecting rod, and the bottom of the threaded ring is rotatably connected to a limiting plate. There are two limiting plates, and the limiting plates are slidably engaged with the limiting grooves. The bottom of the limiting plates extends through the limiting grooves to below the fixed ring.

[0010] Preferably, the outer wall of the connecting rod is provided with an external thread adapted to the threaded ring, and a rubber ring is fixed to the outer wall of the threaded ring, with anti-slip texture on the rubber ring.

[0011] Preferably, when the threaded ring rotates down to contact the top of the fixed ring, the limiting plate extends into the front rod.

[0012] Preferably, the limiting plate is an arc-shaped plate structure.

[0013] The advantages of this utility model are: 1. This utility model adopts a three-section structural design of front rod, tail rod and U-shaped groove. When in use, the overall length of the device can be adjusted according to the usage requirements, so that when replacing spark plug wear parts, it is not necessary to disassemble the engine, which reduces the difficulty of replacement, improves work efficiency, and is also easy to carry and store. 2. Through the structural design of the fixed ring, threaded ring, limiting plate and external thread, this utility model can restrict the circumferential rotation between the segments when the three-segment sleeve is extended and aligned. This can prevent the connection part from rotating when turning the spark plug, ensure that the torque applied by the handle can be efficiently transmitted to the sleeve head, and improve the reliability of operation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the limiting mechanism of this utility model in its non-working state; Figure 2 This is a schematic diagram of the limiting mechanism of this utility model in its working state; Figure 3 This is a schematic diagram of the disassembled structure of this utility model; Figure 4 This is a schematic diagram of the connection structure between the threaded ring and the limiting plate of this utility model; Figure 5 This is a schematic diagram of the structure of the fixed ring of this utility model.

[0016] In the diagram: 1. Front rod; 10. Sleeve head; 2. Tail rod; 3. U-groove; 4. Connecting rod; 40. Assembly port; 5. Limiting mechanism; 50. Fixing ring; 500. Limiting groove; 51. Threaded ring; 52. Limiting plate; 53. External thread. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0018] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail. This application discloses a three-section spark plug sleeve. (Refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A three-section spark plug sleeve includes a front rod 1, a rear rod 2, and a connecting rod 4. A sleeve head 10 is welded to the bottom end of the front rod 1. A cavity is provided through the front rod 1 and the rear rod 2. A U-shaped groove 3 communicating with the cavity is provided at one end of the front rod 1 and the rear rod 2 to provide clearance space for the rotation of the connecting rod 4.

[0019] Both the front rod 1 and the rear rod 2 are forged from No. 45 steel (with chrome plating for rust prevention). The through-hole is used to reduce weight. The end of the front rod 1 away from the U-shaped groove 3 is fixed to the sleeve head 10 by welding. The sleeve head 10 is made of high carbon steel and quenched to a hardness of HRC55-58. The inner wall is provided with axial anti-slip teeth to fit M12 / M14 spark plug heads. The end of the rear rod 2 away from the U-shaped groove 3 has a through hole for mounting a handle.

[0020] The two ends of the connecting rod 4 rotate within the U-shaped grooves 3 on the front end rod 1 and the tail end rod 2, respectively, and both ends of the outer wall of the connecting rod 4 are provided with limit mechanisms 5.

[0021] Reference Figure 3A rotating shaft is rotatably mounted on the U-shaped groove 3. The rotating shaft can be a damping rotating shaft. Holes for assembling the rotating shaft are opened on both sides of the inner wall of the U-shaped groove 3. The connecting rod 4 is a hollow rod with circular openings at both ends. An assembly port 40 is opened at one end of the connecting rod 4. The assembly port 40 is interference-fitted with the rotating shaft.

[0022] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The limiting mechanism 5 includes a fixed ring 50 and a threaded ring 51. The fixed ring 50 is fixed to the outer wall of the connecting rod 4. A limiting groove 500 is provided on the fixed ring 50 to guide the sliding of the limiting plate 52.

[0023] Reference Figure 3 , Figure 4 and Figure 5 The threaded ring 51 is threaded onto the outer wall of the connecting rod 4. The bottom of the threaded ring 51 is rotatably connected to a limiting plate 52. There are two limiting plates 52. The limiting plates 52 are slidably engaged with the limiting groove 500. The bottom of the limiting plate 52 extends through the limiting groove 500 to below the fixed ring 50.

[0024] Among them, a "T"-shaped annular groove is machined around the bottom surface of the threaded ring 51, and the center of the annular groove is coaxial with the threaded ring. A "T-shaped protrusion" is fixed at the top of the limiting plate 52. The protrusion is embedded in the T-shaped annular groove of the threaded ring, forming an axial limiting (cannot be disengaged vertically) but circumferential sliding fit.

[0025] Reference Figure 3 and Figure 4 The outer wall of the connecting rod 4 is provided with an external thread 53 adapted to the threaded ring 51. A rubber ring is fixed on the outer wall of the threaded ring 51. The rubber ring is provided with anti-slip texture to facilitate anti-slip when manually rotating.

[0026] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 When the threaded ring 51 rotates and descends to contact the top of the fixed ring 50, the limiting plate 52 extends into the front end rod 1. The limiting plate 52 has an arc-shaped plate structure. After extending into the cavity of the front end rod 1, the arc-shaped outer wall fits against the inner wall of the front end rod 1.

[0027] Working principle: The three-section sleeve is initially folded: the front rod 1 and the rear rod 2 are connected by the rotation of the connecting rod 4. At this time, the overall length is shortened, which can easily pass through the narrow gap between the frame and the cylinder head and the deep groove of the cylinder head, avoiding interference with surrounding parts.

[0028] However, when unfolding and using it, manually bend the front rod 1 and the tail rod 2 so that they rotate around the axis of the connecting rod 4 until they are collinear with the connecting rod 4 (the three segments are in a straight line). At this time, the axes of the front rod 1, the connecting rod 4, and the tail rod 2 coincide. Hold the rubber ring of the threaded ring 51 and rotate it clockwise. The threaded ring 51 moves downward along the external thread 53, causing the bottom limiting plate 52 to slide down along the limiting groove 500 of the fixed ring 50. When the bottom of the threaded ring 51 is in contact with the top of the fixed ring 50, the bottom of the limiting plate 52 extends into the inner wall of the front rod 1, and its arc surface is in contact with the inner wall of the rod. Through the contact between the limiting plate 52 and the inner wall of the front rod 1, the circumferential rotation of the front rod 1 and the connecting rod 4 (and the tail rod 2 and the connecting rod 4) is restricted, and the linear locking of the three-segment sleeve is achieved.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A three-section spark plug sleeve, characterized in that, include: The front end rod (1) and the tail end rod (2) are provided with a sleeve head (10) fixed at the bottom end of the front end rod (1). Both the front end rod (1) and the tail end rod (2) are provided with cavities. Both the front end rod (1) and the tail end rod (2) are provided with U-shaped grooves (3) that connect the cavities. The connecting rod (4) has two ends that rotate in the U-shaped grooves (3) on the front end rod (1) and the tail end rod (2), respectively. Both ends of the outer wall of the connecting rod (4) are provided with limit mechanisms (5).

2. A three-section spark plug sleeve according to claim 1, characterized in that: A rotating shaft is rotatably mounted on the U-shaped groove (3). The connecting rod (4) is a hollow rod with circular openings at both ends. One end of the connecting rod (4) is provided with an assembly port (40), which is interference-fitted with the rotating shaft.

3. A three-section spark plug sleeve according to claim 2, characterized in that: The limiting mechanism (5) includes a fixed ring (50) and a threaded ring (51). The fixed ring (50) is fixed to the outer wall of the connecting rod (4), and a limiting groove (500) is provided on the fixed ring (50).

4. A three-section spark plug sleeve according to claim 3, characterized in that: The threaded ring (51) is threaded onto the outer wall of the connecting rod (4). The bottom of the threaded ring (51) is rotatably connected to a limiting plate (52). There are two limiting plates (52). The limiting plate (52) is slidably engaged with the limiting groove (500). The bottom of the limiting plate (52) extends through the limiting groove (500) to the bottom of the fixed ring (50).

5. A three-section spark plug sleeve according to claim 4, characterized in that: The outer wall of the connecting rod (4) is provided with an external thread (53) adapted to the threaded ring (51), and a rubber ring is fixed on the outer wall of the threaded ring (51), and anti-slip texture is provided on the rubber ring.

6. A three-section spark plug sleeve according to claim 5, characterized in that: When the threaded ring (51) rotates and descends to contact the top of the fixed ring (50), the limiting plate (52) extends into the front end rod (1).

7. A three-section spark plug sleeve according to claim 6, characterized in that: The limiting plate (52) is an arc-shaped plate structure.

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