Synchronous compression tool for valve spring of engine cylinder cover

Abstract

The utility model provides a synchronous compression tool for an engine cylinder cover valve spring, and relates to the technical field of engine cylinder covers. The bottom plate is used for being placed at the end of a valve spring of an engine cylinder cover to compress the valve spring, four through holes are formed in the bottom plate and penetrate through the bottom plate, and the forming positions of the four through holes correspond to the positions of the valve spring of the engine cylinder cover in a one-to-one mode. The bottom plate is further provided with a connecting hole, the connecting hole penetrates through the bottom plate, and the connecting hole corresponds to a center screw hole of the engine cylinder cover. The connecting screw rod is arranged in the connecting hole in a sliding and penetrating mode, and the connecting screw rod can be in threaded connection with a center screw hole of an engine cylinder cover. The connecting screw on the side, away from the valve spring, of the bottom plate is in threaded connection with a nut, and the nut abuts against the bottom plate. Compared with a traditional manual compression mode or a one-by-one compression mode, the multiple valve springs can be synchronously compressed, the operation time is greatly shortened, and the efficiency of maintaining and replacing valve lock pieces is improved.

Description

Technical Field

[0001] This application relates to the technical field of engine cylinder heads, and more particularly, to a tool for synchronously compressing valve springs of an engine cylinder head. Background Art

[0002] In the oil exploration industry, the imitation V12 truck is an important exploration equipment. With its excellent off-road performance and strong load-bearing capacity, it plays a key role in complex environments such as deserts and the wild, and is known as the "camel of desert exploration". During exploration work, in order to ensure the normal operation of the imitation V12 truck, various maintenance and repairs need to be carried out on a daily basis. And the maintenance and repair of the engine of the imitation V12 truck is an important step in the maintenance and repair.

[0003] During the disassembly and assembly operation of the engine cylinder head valve spring in engine maintenance and repair, the existing valve spring compression equipment requires two people to operate, and only one valve spring can be compressed at a time, resulting in low efficiency. Moreover, during the compression process, continuous downward pressure on the spring is required, resulting in high labor intensity, which not only easily causes fatigue but also poses certain safety risks. Once the operation is improper, accidents such as spring rebound and injury to people may occur. Utility Model Content

[0004] The purpose of this application is to provide a tool for synchronously compressing valve springs of an engine cylinder head, aiming to solve the problem that the existing valve spring compression equipment can only compress one valve spring at a time, resulting in low efficiency.

[0005] The first aspect of this application provides a tool for synchronously compressing valve springs of an engine cylinder head, including:

[0006] A bottom plate and a connecting screw;

[0007] The bottom plate is used to be placed at the end of the valve spring of the engine cylinder head to compress the valve spring;

[0008] The bottom plate is provided with four through holes, the through holes penetrate through the bottom plate, and the positions of the four through holes correspond one by one to the positions of the valve springs of the engine cylinder head;

[0009] The bottom plate is further provided with a connecting hole, the connecting hole penetrates through the bottom plate, and the connecting

[0010] hole corresponds to the central screw hole of the engine cylinder head;

[0011] The connecting screw slides through the connecting hole, and the connecting screw can be threadedly connected to the central screw hole of the engine cylinder head;

[0012] A nut is threadedly connected to the connecting screw rod on the side of the bottom plate away from the valve spring, and the nut abuts against the bottom plate.

[0013] Optionally, two support rods are connected to the bottom plate, and the two support rods respectively correspond to the mounting holes of the engine cylinder head.

[0014] Optionally, the bottom plate is provided with two guide holes, and the guide holes penetrate through the bottom plate, and the support rods are snap-fitted into the guide holes.

[0015] Optionally, the connecting screw rod includes a first part and a second part connected in sequence. The first part can be threadedly connected to the central screw hole of the engine cylinder head. The diameter of the second part is smaller than that of the first part to form a step at the connection between the first part and the second part;

[0016] The inner diameter of the connecting hole is smaller than the outer diameter of the step.

[0017] Optionally, a rotating head is provided at one end of the second part away from the first part.

[0018] Optionally, a contact ring is arranged inside each through hole, and one side of the contact ring close to the valve spring of the engine cylinder head extends outside the through hole.

[0019] Optionally, the contact ring is made of plastic.

[0020] Optionally, a contact ring is rotatably sleeved at one end of the nut close to the bottom plate.

[0021] Beneficial effects:

[0022] The engine cylinder head valve spring synchronous compression tool provided by the present application can synchronously compress multiple valve springs. Compared with the traditional manual or one-by-one compression method, the operation time is greatly shortened, and the efficiency of repairing and replacing valve retainers is improved. Description of the drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structure of an engine cylinder head valve spring synchronous compression tool proposed in an embodiment of the present application

[0025] diagram Figure 1 ;

[0026] Figure 2 Schematic diagram of a structure of a synchronous compression tool for engine cylinder head valve springs proposed in an embodiment of the present application Figure 2 .

[0027] Explanation of reference numerals: bottom plate 1, through hole 101, connection hole 102, abutting ring 103, connection screw 2, first part 201, second part 202, rotating head 203, nut 3, abutting ring 301, support rod 4. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] In the related art, the traditional operation method requires compressing each valve spring one by one and disassembling and assembling each valve one by one. The entire operation process takes a long time and usually takes 48 minutes to complete. This inefficient operation method not only affects the overall progress of engine repair but also increases the cost of equipment downtime. During the disassembly and assembly process, usually two operators are required to cooperate. One operator operates the tool to compress the spring, and the other is responsible for installing or removing the valve retainer. This operation mode has a high demand for human resources and increases the labor cost. Since the operator needs to continuously press down the spring with force throughout the process, the labor intensity is high, which not only easily causes fatigue but also poses certain safety risks. Once the operation is improper, accidents such as the spring rebounding and injuring people may occur. Existing tools need to be continuously adjusted during the disassembly and assembly process to adapt to valve springs in different positions, increasing the complexity and inconvenience of the operation.

[0030] In view of this, an embodiment of the present application proposes a synchronous compression tool for engine cylinder head valve springs, as Figure 1 and Figure 2 shown. A synchronous compression tool for engine cylinder head valve springs includes: a bottom plate 1 and a connection screw 2. The bottom plate 1 is used to be placed at the end of the valve spring of the engine cylinder head to compress the valve spring.

[0031] When disassembling the valve spring, first disassemble other outer components of the engine cylinder head to expose the valve spring. The size of the bottom plate 1 matches each valve spring of the engine cylinder head, that is, the bottom plate 1 can completely cover each valve spring at the same time. When compressing the valve spring, place the bottom plate 1 at the end of each valve spring, and then the entire valve spring can be pressed simultaneously by pressing the bottom plate 1.

[0032] Specifically, the valve spring includes: Spring coil: This is the main part of the valve spring and is composed of multiple tightly wound metal coils. These coils are usually made of high-elasticity and high-strength alloy steel to withstand high-speed and high-frequency compression and release. Spring seat: The spring seats are located at both ends of the valve spring and are used to fix the valve spring on the valve stem and the cylinder head or valve tappet. The spring seats are usually made of wear-resistant and corrosion-resistant materials to ensure the stable operation of the valve spring. Valve retainer: Through its special design, such as grooves or snaps, the valve retainer fixes the valve spring on the valve stem to prevent the valve spring from falling off or shifting during compression or release. And other components.

[0033] In order to expose the valve stem and the valve retainer when pressing the valve spring, four through holes 101 are provided in the bottom plate 1. The through holes 101 penetrate through the bottom plate, and the positions where the four through holes 101 are provided correspond one-to-one to the positions of the valve springs of the engine cylinder head.

[0034] In this way, the positions of the four through holes correspond one-to-one to the positions of the valve springs on the engine cylinder head. This ensures that the synchronous compression tool can accurately correspond to each valve spring. When using the synchronous compression tool to compress the spring through threaded connection, as the spring is compressed, the valve stem and the valve retainer will rise relatively. Due to the design of the through holes 101, these components can be exposed from the through holes 101, facilitating the operator to quickly and safely remove the valve retainer, thereby realizing the disassembly and assembly of the valve. And in one press, it can act on multiple valve springs simultaneously, significantly reducing the operation time.

[0035] In order to position and press the bottom plate 1, a connection hole 102 is also provided in the bottom plate 1. The connection hole 102 penetrates through the bottom plate 1, and the connection hole 102 corresponds to the central screw hole of the engine cylinder head. The central screw hole is the threaded hole in the engine cylinder head that connects to the fuel injector, and the central screw hole is provided in the middle of the four valve springs. The position of the connection hole 102 is located in the middle of the four through holes 101. The connection screw 2 slidably penetrates inside the connection hole 102, and the connection screw 2 can be threadedly connected to the central screw hole of the engine cylinder head. The connection screw 2 provides positioning and support for the bottom plate 1, ensuring that the bottom plate 1 does not slide horizontally when pressing the valve spring.

[0036] Specifically, when placing the bottom plate 1 to press the valve spring, insert the connecting screw rod 2 into the connecting hole 102, and then align the connecting hole 102 of the bottom plate 1 with the central screw hole, so that the connecting screw rod 2 can be threadedly connected into the central screw hole. And while aligning the connecting hole 102 of the bottom plate 1 with the central screw hole, align the through hole 101 with the valve spring. At this time, pressing the bottom plate 1 can press the valve spring.

[0037] As Figure 1 shown, a nut 3 is threadedly connected to the connecting screw rod 2 on the side of the bottom plate 1 away from the valve spring. Rotating the nut 3 can move on the connecting screw rod 2, so that the nut 3 abuts against the bottom plate 1. Then continue to rotate the nut 3, and the nut 3 moves and presses the bottom plate 1, so that the bottom plate 1 is pressed in the direction of the valve spring, thereby pressing the valve spring. When the valve spring is compressed to expose the valve lock piece, the valve lock piece can be removed to realize the disassembly of the valve spring. And during installation, when compressed to the point where the valve lock piece can be installed on the valve stem, installing the valve lock piece can complete the installation of the valve spring.

[0038] By rotating the nut 3, the pressing force and distance of the bottom plate 1 on the valve spring can be precisely controlled, making the entire compression process more efficient and controllable. This method avoids the need to continuously adjust the force and position when manually pressing the spring, thus saving a large amount of time and manpower. The traditional manual method of pressing the spring has problems such as high labor intensity and high safety risks. Using the nut 3 in threaded connection with the connecting screw rod 2 and realizing the compression of the valve spring by rotating the nut 3 not only reduces the labor intensity of the operators, but also greatly reduces the safety risks caused by improper force or sudden release of the spring. The threaded connection between the nut 3 and the connecting screw rod 2 has self-locking property, which can maintain a stable pressure during the compression process and avoid pressure fluctuations or deviations caused by manual pressing. At the same time, the threaded connection has high precision, which can ensure that the pressing position of the bottom plate 1 on the valve spring is accurate. After setting the nut 3, the operation process of the entire compression tool is simplified. The operator only needs to rotate the nut 3 to realize the compression and release of the valve spring, without complex adjustments and operations. By adjusting the position of the nut 3 on the connecting screw rod 2, the compression requirements of valve springs of different models and specifications can be adapted. This design enables the tool to be applied in various scenarios, improving its versatility and flexibility.

[0039] Further, in order to prevent the bottom plate 1 from rotating when it is pressed, which may cause the through hole 101 to no longer align with the valve spring, two support rods 4 are connected to the bottom plate 1, and the two support rods 4 respectively correspond to the mounting holes on the engine cylinder head. The mounting holes on the engine cylinder head are threaded holes for connecting the edge area of the engine cylinder head to other components. When disassembling or installing the valve spring, since the engine cylinder head has been disassembled from other components, the mounting holes on the engine cylinder head are vacant and can be used for the support rods 4 to insert, so as to achieve the function of preventing the bottom plate 1 from rotating.

[0040] Specifically, the support rods 4 provide additional support points for the bottom plate 1 by corresponding to the mounting holes on the engine cylinder head (the support rods 4 are inserted into the mounting holes on the engine cylinder head). When compressing the valve spring, these support rods 4 can ensure that the bottom plate 1 remains horizontal and stable, avoiding the bottom plate 1 from shifting or rotating due to uneven force during the compression process. The stable bottom plate 1 can reduce the shaking during the operation process and lower the safety risk caused by the out-of-control tool. The existence of the support rods 4 helps to maintain the precise alignment between the bottom plate 1 and the valve spring, ensuring that each valve spring can be evenly stressed during the compression process. This can not only improve the compression effect but also reduce the spring damage or equipment damage caused by uneven force. By reducing the shaking and friction of the bottom plate 1 during the compression of the valve spring, the support rods 4 help to protect the bottom plate 1 and other components from unnecessary wear, thereby extending the service life of the entire tool.

[0041] Further, two guiding holes are provided on the bottom plate 1, and the guiding holes penetrate through the bottom plate 1. The support rods 4 are snap-fitted into the guiding holes. When the support rods 4 are snapped into the guiding holes, they can be pulled out when not in use. The detachable connection between the support rods 4 and the bottom plate 1 is realized. When the compression tool is not in use or needs to be stored, the support rods 4 can be pulled out from the guiding holes. This can significantly reduce the space occupied by the whole tool, making storage and transportation more convenient. The detachable connection between the support rods 4 and the guiding holes also facilitates the separate maintenance and replacement of the support rods 4. In the case of long-term use or accidental damage, the user can easily remove the damaged support rods 4 and replace them with new support rods 4 without replacing the whole bottom plate or other components, thus reducing the maintenance cost and difficulty. During the installation and disassembly process, the user can easily complete the fixing and releasing of the support rods 4 without complex operations or tools. This design simplifies the use process of the tool and improves the operation convenience and efficiency.

[0042] As Figure 2As shown, further, the connecting screw 2 includes a first part 201 and a second part 202 connected in sequence. The first part 201 can be threadedly connected to the central screw hole of the engine cylinder head. The diameter of the second part 202 is smaller than that of the first part 201, so as to form a step at the connection of the first part 201 and the second part 202. The inner diameter of the connecting hole 102 is smaller than

[0043] the outer diameter of the step.

[0044] The first part 201 has a larger diameter and can be threadedly connected to the central screw hole of the engine cylinder head, thereby ensuring the precise positioning of the connecting screw 2 on the cylinder head. This threaded connection is not only stable but also prevents the connecting screw 2 from slipping or shifting during the compression process. The diameter of the second part 202 is smaller than that of the first part 201, so the step is formed at the connection of the two parts. The inner diameter of the connecting hole 102 is smaller than the outer diameter of the step. The step can be stuck on the edge of the connecting hole 102, thereby preventing the connecting screw 2 from accidentally falling off the bottom plate 1. When picking up and moving the bottom plate 1 and the connecting screw 2, only by lifting the connecting screw 2 can these two components be picked up. It facilitates the overall picking up and placing and prevents the components from scattering during picking up and placing.

[0045] Further, a rotating head 203 is provided at one end of the second part 202 away from the first part 201. The rotating head 203 is a hexagonal cylinder. When installing the connecting screw 2 into the central screw hole of the engine cylinder head or removing the connecting screw 2 from the central screw hole of the engine cylinder head, the connecting screw 2 can be rotated by turning the rotating head 203 with a wrench.

[0046] Specifically, the rotating head 203 is designed as a hexagonal cylinder. This design enables workers to easily clamp and rotate the connecting screw 2 with common tools such as wrenches. Compared with traditional smooth or irregular shapes, the hexagonal design provides better clamping stability and rotation efficiency. When installing the connecting screw 2 into the central screw hole of the engine cylinder head or removing it, the rotation operation can be quickly achieved through the rotating head 203, thereby shortening the installation and disassembly time and improving work efficiency. Since the hexagonal design of the rotating head 203 enables tools such as wrenches to be stably clamped, the possibility of slipping or tool damage caused by unstable clamping is reduced. Using tools such as wrenches to rotate the connecting screw 2 through the rotating head 203 can avoid hand injuries that may be caused by directly operating with hands, increasing the safety during the operation process. The connecting screw 2 can be tightened more evenly through the rotating head 203, ensuring the tight connection between the connecting screw 2 and the central screw hole of the engine cylinder head, thereby improving the reliability and stability of the connection.

[0047] Furthermore, a contact ring 103 is disposed inside each of the through holes 101, and one side of the contact ring 103 close to the valve spring of the engine cylinder head extends outside the through hole 101. The contact ring 103 is used to directly contact the valve spring. The contact ring 103 serves as a medium between the bottom plate 1 and the valve spring, which can reduce the direct friction and damage of the bottom plate 1 to the valve spring. During the compression process, the contact ring 103 can disperse the pressure and prevent the hard material of the bottom plate 1 from causing scratches or indentations on the valve spring. Due to the existence of the contact ring 103, the compression force of the bottom plate 1 on the valve spring can be more evenly distributed over the entire spring. This helps to ensure that all valve springs can be compressed at the same rate and to the same extent, thereby improving the consistency and efficiency of the operation. During the compression process, the valve spring may shift or tilt due to uneven force. The contact ring 103 can closely fit on the valve spring to prevent unnecessary movement, ensuring the stability and safety of the compression process. The contact ring 103 is a wear part, which can, to a certain extent, replace the bottom plate 1 to bear the wear and impact during the compression process. In this way, even if the contact ring 103 wears or is damaged, it can be easily replaced without replacing the entire bottom plate 1, thus extending the overall service life of the tool. Since the design of the contact ring 103 makes the compression process smoother and more uniform, the compression time can be shortened and the operation efficiency can be improved. At the same time, since the rework and repair time caused by improper operation are reduced, the overall work efficiency is further improved.

[0048] Furthermore, the contact ring 103 is made of plastic. The plastic contact ring 103 has good self-lubricity, which can reduce friction and wear when contacting the valve spring, and protect the surface of the valve spring from being scratched or damaged. This is very beneficial for maintaining the performance of the valve spring and extending its service life. Plastic is lighter than materials such as metal. Using the plastic contact ring 103 can reduce the weight of the entire compression tool, making the operation more convenient and reducing the labor intensity of the operator.

[0049] In an alternative embodiment, the contact ring 103 can also be made of rubber or nylon. Rubber also has good elasticity and self-lubricity, which can reduce the friction and wear on the valve spring. In addition, rubber has good shock absorption effect, which can buffer the impact force during the compression process to a certain extent. Nylon is a high-performance engineering plastic with high strength and wear resistance, and also has certain self-lubricity. Using the nylon contact ring can provide sufficient strength and wear resistance while maintaining a relatively light weight, meeting the use requirements of the valve spring compression tool. In addition, nylon also has good chemical corrosion resistance and high temperature resistance, and can adapt to a wider working environment.

[0050] Further, a contact ring 301 is rotatably sleeved at one end of the nut 3 close to the bottom plate 1. The contact ring 301 is used to directly contact the bottom plate 1, and the contact ring 301 is rotatably connected to the nut 3. In this way, when the nut 3 rotates to press the bottom plate 1, the nut 3 will not

[0051] friction with the bottom plate 1.

[0052] Specifically, the setting of the contact ring 301 enables the nut 3 not to directly rub against the surface of the bottom plate 1 when rotating and applying pressure to the bottom plate 1. This reduces the wear that may occur on the surface of the bottom plate 1 due to long-term friction, thereby extending the service life of the bottom plate 1. Since the contact ring 301 is rotatably connected to the nut 3, when an operator rotates the nut 3 with a tool such as a wrench, the rotating head 203 can rotate more smoothly, reducing the resistance generated by direct friction and improving work efficiency. The contact ring 301 can provide a stable and evenly distributed contact surface, enabling the pressure applied by the nut 3 to be transmitted more evenly to the bottom plate 1, thereby ensuring the effect of synchronous compression of the valve spring.

[0053] Specifically, when disassembling, installing, or compressing the valve spring, first insert the connecting screw 2 into the connecting hole 102, then place the bottom plate 1 on the valve spring, align the connecting hole 102 with the central screw hole of the engine cylinder head, and align the through hole 101 with the valve spring. And when placing the bottom plate 1, also insert the support rod 4 into the installation hole of the engine cylinder head. Then rotate the connecting screw 2 to threadedly connect it into the central screw hole of the engine cylinder head. After the connecting screw 2 is stably connected, connect the nut 3 to the connecting screw 2 and rotate the nut 3 to press the bottom plate 1, so that the bottom plate 1 compresses the valve spring until the valve retainer and the valve stem of the valve spring are exposed, completing the compression of the valve spring. Subsequently, the valve retainer can be taken or installed according to the disassembly or installation steps.

[0054] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0055] It should also be noted that in this text, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. In addition, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor can they be construed as indicating or implying relative importance. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the element.

[0056] The technical solutions provided in this application have been introduced in detail above. Specific examples are used in this text to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only for helping to understand this application, and the content of this specification should not be construed as a limitation to this application. At the same time, for those of ordinary skill in the art, based on this application, there will be various forms of changes in the specific implementation manners and application scopes. It is not necessary and impossible to enumerate all the implementation manners here, and the obvious changes or alterations derived therefrom are still within the protection scope of this application.

Claims

1. An engine cylinder head valve spring synchronous compression tool, characterized in that, Comprising: A bottom plate and a connecting screw; The bottom plate is used to be placed at the end of the valve spring of the engine cylinder head to compress the valve spring; Four through holes are formed in the bottom plate, the through holes penetrate through the bottom plate, and the positions where the four through holes are formed correspond to the positions of the valve springs of the engine cylinder head one by one; A connecting hole is further formed in the bottom plate, the connecting hole penetrates through the bottom plate, and the connecting hole corresponds to the central screw hole of the engine cylinder head; The connecting screw is slidably inserted into the connecting hole, and the connecting screw can be threadedly connected to the central screw hole of the engine cylinder head; A nut is threadedly connected to the connecting screw on the side of the bottom plate away from the valve spring, and the nut abuts against the bottom plate.

2. The valve spring synchronous compression tool for an engine cylinder head according to claim 1, characterized in that, Two support rods are connected to the bottom plate, and the two support rods respectively correspond to the mounting holes of the engine cylinder head.

3. The valve spring synchronous compression tool for an engine cylinder head according to claim 2, characterized in that Two guiding holes are formed in the bottom plate, and the guiding holes penetrate through the bottom plate, and the support rods are snap-fitted into the guiding holes.

4. The valve spring synchronous compression tool for an engine cylinder head according to claim 1, characterized in that The connecting screw comprises a first part and a second part which are sequentially connected, the first part can be threadedly connected to the central screw hole of the engine cylinder head, and the diameter of the second part is smaller than that of the first part to form a step at the connection between the first part and the second part; The inner diameter of the connecting hole is smaller than the outer diameter of the step.

5. The engine cylinder head valve spring synchronous compression tool according to claim 4, characterized in that, A rotating head is provided at one end of the second part away from the first part.

6. The valve spring synchronous compression tool for an engine cylinder head according to claim 1, wherein, An abutting ring is arranged inside each through hole, and one side of the abutting ring close to the valve spring of the engine cylinder head extends outside the through hole.

7. The valve spring synchronous compression tool for an engine cylinder head according to claim 6, wherein, The abutting ring is made of plastic.

8. The valve spring synchronous compression tool for an engine cylinder head according to claim 1, wherein, An abutting ring is rotatably sleeved at one end of the nut close to the bottom plate.

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