Lossless torque dismounting tool for lower shaft sleeve of oil sprayer
By designing a non-destructive torque disassembly and assembly tool for the lower bushing of the injector, the problems of inaccurate torque application and damage to the lower bushing during independent repair were solved, achieving high-quality and low-cost injector repair.
Patent Information
- Application Number
- CN202423048363.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-11
AI Technical Summary
When repairing the lower bushing of an electronic fuel injector independently, the lack of specialized torque disassembly and assembly equipment makes it impossible to accurately apply the standard torque, affecting the assembly quality of the internal parts of the fuel injector. Furthermore, conventional tools can easily damage and render the lower bushing unusable.
Design a non-destructive torque disassembly and assembly tool for the lower bushing of an injector, including a torque controller, a locking component, and an arc-shaped clamp. The arc-shaped clamp is fixed by the locking component to form a ring sleeve, ensuring non-destructive disassembly and assembly under high torque conditions. Precise torque control is achieved through the cooperation of the torque hole and the torque plug.
It enables non-destructive disassembly and assembly of the lower injector bushing, improves the assembly qualification rate and disassembly accuracy, reduces maintenance costs, avoids damage and scrapping of the lower bushing, and ensures that the repair performance meets the standards.
Smart Images
Figure CN223493166U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical repair tool technology, specifically relating to a non-destructive torque disassembly and assembly tool for the lower bushing of an injector. Background Technology
[0002] Due to the superior power-to-volume ratio and rapid response to load changes of electronic fuel injection diesel generator sets, they are often used as the main power supply equipment in field drilling production. The electronic fuel injector is the core assembly of this type of unit, and its procurement cost is high. In order to reduce the repair and reuse cost of electronic fuel injectors, users usually adopt the method of self-repair.
[0003] However, in the independent repair of electronic fuel injectors for Caterpillar and Volvo diesel engines, the disassembly and reassembly of the lower bushing at the bottom of the electronic fuel injector has become a key factor affecting the repair quality. For example... Figure 8 As shown, in the prior art, the external structure of the lower bushing 2 of the injector 1 is designed as a stepped thin-walled shell, with its outer diameter gradually decreasing from top to bottom. The upper part of the lower bushing 2 is a protruding ring 22 with the largest outer diameter, while the lower part is formed as a conical ring 20, the outer diameter of which also gradually decreases from top to bottom. The lower bushing 2 internally houses a series of precision components, such as the injector nozzle assembly and the delivery valve assembly. Due to the compact installation requirements of these components, the lower bushing 2 has a thin shell wall and lacks conventional rotating structures such as square, hexagonal, octagonal, or dodecagonal shapes for easy rotation and disassembly. The bushing's outer surface is a smooth cylindrical design. In manufacturing, this type of injector requires specialized equipment to apply a standard torque for tightening. When performing repairs independently, due to the lack of access to specialized torque-measuring and disassembling equipment, the repair site can only rely on conventional pipe wrenches and bench vises for operation. Without specialized disassembly and assembly equipment, the following technical problems are likely to occur:
[0004] 1. Due to the stepped cylindrical thin-walled structure of the lower bushing, it is difficult for operators to accurately apply the same torque as the manufacturer's standard torque when using pipe wrenches. This causes high-precision components such as the needle valve assembly and delivery valve assembly inside the injector to fail under incorrect assembly torque, which seriously affects the first-time assembly pass rate of the injector. In addition, excessive installation torque often causes microscopic deformation of high-precision mating parts inside the injector, resulting in the scrapping of high-value precision parts.
[0005] 2. Due to the stepped cylindrical thin-walled structure of the lower bushing, the side-rotation torque of the pipe wrench can easily cause the lower bushing to become out of round and have tooth marks, increasing the risk of scrapping.
[0006] Therefore, it is necessary to design a new type of injector lower bushing disassembly and assembly tool to ensure precise torque assembly and non-destructive disassembly and assembly of injector lower bushings during autonomous repair, so as to achieve the goal of cost reduction and efficiency improvement for high-value assemblies with high quality, low cost, and full-process autonomous repair. Utility Model Content
[0007] The purpose of this invention is to solve the aforementioned problems in the existing technology by providing a non-destructive torque disassembly and assembly tool for injector lower bushings. This effectively solves two major technical problems: first, the inability to apply torque consistently with manufacturer standards during independent repairs leads to failure in the needle valve assembly and easy scrapping of high-precision mating parts; second, the side-rotation torque of the pipe wrench easily causes the lower bushing to become out of round and develop tooth marks. This invention achieves the goal of non-destructive disassembly and assembly of the injector's thin-walled lower bushing and accurate torque application during independent repair processes.
[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0009] A non-destructive torque-based tool for installing and removing the lower bushing of an injector includes a torque controller, a locking element, and two symmetrical arc-shaped clamps. The locking element is fixed to the two arc-shaped clamps, and its position on the clamps is adjustable. After being fixed by the locking element, the two arc-shaped clamps form a ring-shaped sleeve for clamping and holding the lower bushing of the injector. After the two arc-shaped clamps are clamped and fixed to the lower bushing of the injector, there is a gap D between the side end faces of the two arc-shaped clamps, where D is in the range of 1mm≤D≤2mm. A torque hole adapted to the torque controller is provided between the top ends of the two arc-shaped clamps. The torque hole and the ring-shaped sleeve are coaxial with the lower bushing of the injector. When the torque controller is subjected to force, it can drive the ring-shaped sleeve to rotate through the torque hole and install or remove the lower bushing of the injector.
[0010] The ring sleeve has an opening that is adapted to the lower bushing of the injector. The opening is provided with a clamping part for clamping and holding the protruding ring body of the lower bushing of the injector. The clamping part is located at the lower part of the opening and the inner surface of the clamping part is smooth. The inner diameter of the clamping part of the opening is equal to the outer diameter of the protruding ring body of the lower bushing of the injector.
[0011] The opening is also provided with a conical abutment part for abutting the lower outer conical surface structure of the lower sleeve of the injector. The conical abutment part is located at the upper part of the opening and is coaxial with the lower sleeve of the injector. The inner diameter of the conical abutment part increases in the direction of the clamping part. The conical abutment part is adapted to the lower outer conical surface structure of the lower sleeve of the injector.
[0012] The arc-shaped hoop has a semi-cylindrical structure. Both the upper and lower parts of the arc-shaped hoop have tapered external threads. The outer diameter of the upper part and the outer diameter of the lower part of the arc-shaped hoop increase towards the middle.
[0013] The locking components consist of two nuts, each with an internal thread, whose internal threads are adapted to the external thread structure. Two symmetrical arc-shaped clamps are used to clamp and hold the lower bushing of the injector through the cooperation of the nuts and the external thread structure.
[0014] The torque controller is a torque wrench. The end of the torque wrench is provided with a torque plug that is adapted to the torque hole. The torque hole and the torque plug are coaxial. When the torque wrench is subjected to force, the torque plug is inserted into the torque hole, which drives the ring sleeve to rotate and disassemble / assemble the lower bushing of the fuel injector.
[0015] The top of each of the two arc-shaped hoops is provided with an axial groove. The cross-section of the axial groove is U-shaped, and the U-shaped opening faces the axis of the arc-shaped hoops. The torque hole is formed by the cooperation of the two arc-shaped hoops' axial grooves.
[0016] The torque hole and torque plug are rectangular in structure.
[0017] The non-destructive torque disassembly and assembly tool also includes a U-shaped elastic clamp for holding the injector in a vise.
[0018] The U-shaped elastic clamp is made of spring steel.
[0019] The advantages of using this utility model are:
[0020] 1. This utility model discloses a non-destructive torque disassembly and assembly tool for the lower bushing of an injector. Firstly, through a combination structure of a torque controller, a locking element, and two symmetrical arc-shaped clamps, and with the two arc-shaped clamps fixed by an adjustable locking element to form a ring sleeve for clamping and holding the lower bushing of the injector, it ensures that the lower bushing of the injector can be stably and firmly held and clamped without damage during disassembly and assembly under high torque conditions. This avoids the biting pressure applied to the lower bushing of the injector, improving the accuracy and safety of disassembly and assembly, and ensuring that the disassembly and assembly work can be completed smoothly without causing any damage. Compared with traditional disassembly and assembly methods, it avoids the problems of the lower bushing becoming out of round, biting, or even scrapped that may occur when using tools such as pipe wrenches and bench vises. Furthermore, it is estimated that the overall manufacturing cost of this utility model is only over 600 yuan, which is only 0.2% of the price of dedicated torque equipment for production lines (260,000 yuan / set) found in the survey, making it extremely economical and significantly reducing maintenance costs.
[0021] Secondly, this utility model designs two arc-shaped clamps to hold and fix the lower bushing of the injector, and ensures that there is a gap D between the side end faces of the two arc-shaped clamps, with a range of 1mm to 2mm. This creates infinite frictional pressure to fit the lower bushing of the injector, achieving good fit conditions for the lower bushing of the injector under high torque rotation conditions, and ensuring the reliability and stability of non-destructive disassembly and assembly under high torque conditions.
[0022] Furthermore, this invention utilizes a torque hole between the tops of two arc-shaped clamps, adapted to a torque controller. The torque hole and the clamp sleeve are coaxial with the lower injector bushing, ensuring precise control of the torque applied to the lower injector bushing. This avoids the inaccurate torque control issues common in traditional pipe wrenches and bench vises, significantly improving the accuracy of assembly for precision parts such as the injector nozzle needle valve assembly and delivery valve assembly during independent repair. It also prevents assembly failures caused by operator experience during torque disassembly of the lower bushing using conventional tools, ensuring that the repaired performance meets standard requirements. Simultaneously, the entire disassembly and assembly operation is simple and efficient. Actual testing by the applicant increased the first-time assembly pass rate from 67% using traditional interlocking experience-based methods to 96% after application, with an operation time of ≤2 minutes per part, demonstrating a significant improvement in assembly quality.
[0023] In summary, this utility model, through the coordinated operation of the torque controller, ring sleeve, and locking component, successfully solves the technical problem of difficulty in matching the torque application to the manufacturer's standard during independent repair, which leads to the failure of the needle valve assembly and the easy damage of high-precision components. It ensures accurate torque control and guarantees the achievement of repair performance standards. At the same time, it also overcomes the problem of damage and scrapping of the lower injector bushing when using conventional pipe wrenches and bench vises for disassembly, realizing non-destructive disassembly and assembly of thin-walled lower bushings in independent repair, and achieving the goal of cost reduction and efficiency improvement through high-quality, low-cost, and fully independent repair of high-value assemblies.
[0024] 2. In this utility model, the ring sleeve is designed with an open mouth shape that matches the lower bushing of the injector. Its interior has a clamping part specifically designed to clamp and hold the protruding ring of the lower bushing. The inner surface of the clamping part is machined to a smooth finish so that it can form surface contact with the smooth protruding ring of the lower bushing during rotation. This maximizes the friction area under full contact, resulting in high frictional force under low pressure. Furthermore, the design that the inner diameter of the clamping part of the open mouth is equal to the outer diameter of the protruding ring of the lower bushing facilitates production by milling a complete hollow cylinder along the axis that perfectly fits the outer surface of the lower bushing, dividing it into two symmetrical arc-shaped hoops. These two arc-shaped hoops, locked by locking components, can tightly clamp and hold the lower bushing, significantly improving the reliability and stability of this utility model.
[0025] 3. In this utility model, by designing a conical abutment part inside the opening, it is adapted to and coaxial with the lower outer conical surface structure of the lower injector bushing, thereby achieving the central stability of the lower injector bushing within the ring sleeve, enhancing the reliability and stability of non-destructive disassembly and assembly, and ensuring that after being clamped and fixed by the two arc-shaped clamps, the conical abutment part can effectively guide and straighten the lower injector bushing, keeping it in a central and stable state within the opening.
[0026] 4. In this utility model, the upper and lower parts of the arc-shaped hoop both have tapered external thread structures, and the outer diameter of the upper and lower parts of the arc-shaped hoop are designed to increase towards the middle. Simultaneously, the locking element is designed as two nuts, each with internal threads, whose internal threads are compatible with the external thread structure. Therefore, when the nuts are rotated to engage with the external thread structure, they can flexibly adapt to and firmly clamp the lower injector bushing, thus significantly improving the stability and reliability of clamping and holding the lower injector bushing.
[0027] 5. In this utility model, the torque wrench, in conjunction with the torque hole and torque plug of the ring sleeve, achieves coaxial rotation, which facilitates precise torque control, stabilizes the rotation of the lower bushing of the injector, and improves the accuracy and efficiency of disassembly and assembly.
[0028] 6. In this utility model, by designing the torque hole and torque plug as a rectangular structure, the torque wrench effectively transmits torque to the ring sleeve, thereby achieving precise rotation control of the lower bushing of the injector.
[0029] 7. In this utility model, by adding a U-shaped elastic clamping component made of spring steel, a stable clamping connection between the injector and the vise is achieved. Its opening size is precisely matched with the injector clamping adapter section, ensuring that the injector body can be stably stopped during rotation operation, which greatly improves the stability and efficiency of the injector lower bushing disassembly and assembly. Attached Figure Description
[0030] Figure 1 This is a cross-sectional structural diagram of the present invention;
[0031] Figure 2 This is a cross-sectional view of the fit between the middle ring sleeve and the lower bushing of the injector in this utility model.
[0032] Figure 3 This is a schematic diagram of the structure of the ring sleeve in this utility model;
[0033] Figure 4 This is a top view of the ring sleeve of this utility model;
[0034] Figure 5 This is a bottom view of the ring sleeve of this utility model;
[0035] Figure 6 This is a schematic diagram of the main structure of this utility model;
[0036] Figure 7 This is a schematic diagram of the U-shaped elastic clamping component in this utility model;
[0037] Figure 8 This is a schematic diagram of the structure of the lower bushing of the injector in the prior art;
[0038] Figure 9 This is a schematic diagram showing the location of the external thread connecting the fuel injector in the prior art.
[0039] The numbers in the diagram are as follows: 1. Injector, 2. Lower bushing, 20. Conical ring, 21. Conical abutment, 22. Protruding ring, 3. Clamping adapter section, 4. Ring sleeve, 5. U-shaped elastic clamping element, 6. Arc-shaped clamp, 7. Opening mouth, 8. Nut, 9. External thread structure, 10. Torque hole, 100. Axial groove, 11. Torque controller, 110. Torque wrench, 12. Torque plug, 13. Clamping part, 14. Locking element, 15. Internal thread, 16. Connecting external thread. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. For ease of description, the description of the relative positional relationships of each component is based on the layout of the accompanying drawings, such as the positional relationships of front, back, top, bottom, left, and right, which are determined according to the layout direction of the accompanying drawings.
[0041] This utility model discloses a non-destructive torque disassembly and assembly tool for the lower bushing of an injector, such as... Figure 1-7 As shown, the device includes a torque controller 11, a locking element 14, and two symmetrical arc-shaped clamps 6. The locking element 14 is fixed to the two arc-shaped clamps 6, and the position of the locking element 14 on the arc-shaped clamps 6 is adjustable. After being fixed by the locking element 14, the two arc-shaped clamps 6 form a ring clamp 4 for clamping and holding the lower bushing 2 of the injector. It should be noted that in some embodiments, the structure of the ring clamp 4 can be modified by changing its specifications and dimensions to form various sizes of tools for disassembling and assembling lower bushings of injectors.
[0042] like Figure 5-6 As shown, after the two arc-shaped clamps 6 are clamped and fixed on the lower injector bushing 2, there is a gap D between the side end faces of the two arc-shaped clamps 6. The preferred value of D is 1mm ≤ D ≤ 2mm. That is to say, when the two symmetrical arc-shaped clamps 6 are locked together by the locking member 14 to form a ring sleeve 4 that wraps and tightens the lower injector bushing 2 in a circumferential state, the joint is not completely closed. This ensures that while the ring sleeve 4 applies the ring friction force, it avoids limiting the effective application and transmission of friction pressure due to complete closure. No gap will not generate unlimited friction pressure, while a slight gap achieves the requirement of applying friction pressure and maximizing the contact area. This gap range ensures both the appropriate application of friction pressure and maximizes the contact area between the arc-shaped clamps 6 and the lower injector bushing 2. Thus, under the premise of ensuring sufficient friction force, the lower injector bushing can be disassembled and assembled without damage, ensuring the reliability and stability of the disassembly and assembly process.
[0043] Between the tops of the two arc-shaped clamps 6 is a torque hole 10 adapted to the torque controller 11. The torque hole 10 and the ring clamp 4 are coaxial with the lower injector bushing. When the torque controller 11 is subjected to force, it can drive the ring clamp 4 to rotate through the torque hole 10 and disassemble the lower injector bushing. In this structural state, the torque controller 11 transmits the same torque as the factory standard of the lower injector bushing through the rotation action of the torque hole 10. This ensures the precise control of the torque applied by this utility model, avoids affecting the assembly accuracy of the precision parts inside the injector, and ensures that the repair performance meets the standards during independent repair. At the same time, it avoids the out-of-roundness and tooth marks that may be caused by the use of traditional pipe wrenches and bench vises for disassembly and assembly, and realizes non-destructive disassembly and assembly of the lower injector bushing under the factory standard torque.
[0044] Furthermore, such as Figure 2 , Figure 4-5 As shown, the ring sleeve 4 has an opening 7 that matches the lower injector bushing 2. The opening end of the opening 7 is located at the bottom end of the ring sleeve 4, and the torque hole 10 is located at the top end of the ring sleeve 4. The opening 7 contains a clamping part 13 for clamping and holding the protruding ring body 22 of the lower injector bushing 2. The clamping part 13 is located at the lower part of the opening 7. The inner surface of the clamping part 13 is precision machined to achieve a smooth surface quality, ensuring it is not rough. Therefore, compared to the line contact produced by the traditional pipe wrench side-rotation method, a surface contact is formed between the inner surface of the clamping part 13 and the protruding ring body 22 of the lower injector bushing 2. This design achieves a stable clamping effect by ensuring surface contact between the clamping part 13 and the smooth outer surface of the protruding ring body of the lower bushing 2, thus providing a condition for the ring sleeve 4 to apply a large torque rotation to the lower injector bushing 2 without damaging friction.
[0045] The inner diameter of the clamping part 13 of the opening 7 is equal to the outer diameter of the protruding ring 22 of the lower injector bushing 2. Specifically, in the actual machining process, the two symmetrical arc-shaped clamps 6 are obtained by milling a complete hollow cylinder that perfectly matches the shape of the outer surface of the lower injector bushing 2 along its axis. It is worth noting that during the milling process, a certain amount of material loss will inevitably occur, and this loss happens to form the aforementioned tiny gap D between the side end faces of the two arc-shaped clamps 6.
[0046] Furthermore, the opening 7 is also provided with a conical abutment part 21 for abutting against the lower outer conical surface structure 20 of the lower injector bushing 2. The conical abutment part 21 is located at the upper part of the opening 7, and the torque hole 10 is located at the top of the conical abutment part 21. The inner diameter of the conical abutment part 21 increases towards the clamping part 13. The conical abutment part 21 is coaxial with the lower injector bushing 2 and is adapted to the lower outer conical surface structure 20 of the lower injector bushing 2. After the two arc-shaped clamps 6 are clamped and fixed on the lower injector bushing 2, the conical abutment part 21 abuts against the lower outer conical surface structure 20 of the lower injector bushing 2 to play a guiding and straightening role, so that the lower injector bushing 2 is kept in a central position and reaches a stable state inside the opening 7 of the ring sleeve 4.
[0047] Continue to refer to Figure 2 The arc-shaped hoop 6 has a semi-cylindrical structure. The upper and lower parts of the arc-shaped hoop 6 are both tapered external thread structures 9. The outer diameter of the upper part and the outer diameter of the lower part of the arc-shaped hoop 6 increase towards the middle.
[0048] like Figure 1-3 , Figure 6 As shown, the locking element 14 consists of two nuts 8, each with an internal thread. The internal threads of the nuts 8 are adapted to the external thread structure 9. Two symmetrical arc-shaped clamps 6 are used to clamp and hold the lower bushing of the injector through the engagement of the nuts 8 and the external thread structure 9. Specifically, the two nuts 8 are connected to the upper and lower parts of the arc-shaped clamps 6, respectively. By rotating the nuts 8, the threads are tightened, and the vertical position is adjusted along the external thread structure 9 of the arc-shaped clamps 6. When combined, the two symmetrical arc-shaped clamps 6 fit tightly together, thereby achieving a non-destructive clamping effect on the smooth, thin-walled outer surface of the lower bushing of the injector 2.
[0049] like Figure 1 , Figure 4 As shown, and with Figure 1 Taking the direction shown as an example, the torque controller 11 is preferably a torque wrench 110. The end of the torque wrench 110 is provided with a torque plug 12 that is adapted to the torque hole 10. The torque hole 10 and the torque plug 12 are coaxial. When the torque wrench 110 is subjected to force, it inserts into the torque hole 10 through the torque plug 12, which drives the ring sleeve 4 to rotate and disassembles the lower bushing 2 of the fuel injector.
[0050] like Figure 4 As shown, the top of each of the two arc-shaped hoops 6 is provided with an axial groove 100. The cross-section of the axial groove 100 is U-shaped, and the U-shaped opening faces the axis of the arc-shaped hoops 6. The torque hole 10 is formed by the cooperation of the two arc-shaped hoops 6 with the axial grooves 100. That is, the two nut 8 locks the two arc-shaped hoops 6 together to form a complete torque hole 10.
[0051] Preferably, in order to ensure that the torque wrench 110 effectively transmits torque to the ring sleeve 4, thereby achieving precise rotation control of the lower bushing of the injector, the torque hole 10 and the torque plug 12 are designed as rectangular structures.
[0052] like Figure 1 , Figure 6-8 As shown, the non-destructive torque disassembly and assembly tool of this utility model also includes a U-shaped elastic clamping component 5. The U-shaped elastic clamping component 5 acts as an intermediary for clamping and fixing the injector and the vise, and is designed to be installed on the vise to specifically clamp such as Figure 8 The clamping adapter section 3 of the injector body is shown. The opening size of the U-shaped elastic clamp 5 is precisely matched with the clamping adapter section 3 of the injector to ensure that the injector body can be firmly stopped and fixed during rotation operation.
[0053] The U-shaped elastic clamp 5 is preferably made of spring steel. Its structural feature is that it forms a high-strength U-shaped elastic structure on three sides, ensuring the tightness of the opening when the U-shaped elastic clamp 5 is clamped under strong force, and the characteristic that the opening size can elastically recover after the force is released. In actual operation, the clamping adapter section 3 of the injector 1 is aligned and inserted into the opening of the U-shaped elastic clamp 5. The U-shaped elastic clamp 5 is placed horizontally in the jaws of the vise, and the two sides of the opening are clamped by the vise jaws. After the injector is firmly inside the U-shaped elastic clamp 5, the clamping force of the vise on the U-shaped elastic clamp 5 is increased, and the elastic inward force on both sides of the U-shaped elastic clamp 5 is used to achieve vertical clamping and fixation of the injector 1.
[0054] In summary, the working process of disassembling and assembling the lower bushing of the fuel injector according to this utility model is as follows:
[0055] 1. Preparation stage: First, install the U-shaped elastic clamp 5 horizontally on the bench vise, ensuring that the opening direction and opening size of the U-shaped elastic clamp 5 match the clamping adapter section 3 of the injector; then, place the injector upside down in the opening of the U-shaped elastic clamp 5, and adjust the force of the bench vise. Utilize the elastic inward force of the U-shaped elastic clamp 5 and the clamping force of the bench vise to securely invert the injector.
[0056] 2. Assemble the ring sleeve 4: Slide the two symmetrical arc-shaped hoops 6 onto the inverted upper section of the injector in a slightly loose but not loose state until the lower outer conical surface structure 20 contacts the conical abutment part 21 on the upper part of the opening 7. At this time, the clamping part 13 and the protruding ring body 22 of the lower bushing 2 of the injector are in relative position. At this time, the torque hole 10 of the ring sleeve 4 should face upwards for subsequent connection with the torque wrench 110.
[0057] 3. Torque Wrench Connection and Torque Transmission: Insert the torque plug 12 of the torque wrench 110 into the torque hole 10 at the top of the ring sleeve 4, ensuring a secure connection. Then tighten the nut 8, causing the two symmetrical arc-shaped clamps 6 to wrap around and tighten, achieving the conditions for high-torque rotational disassembly of the lower injector bushing. At the same time, this process also ensures that the two axial slots 100 enclose and wrap around the torque plug 12.
[0058] 4. Torque Application and Disassembly Operation: First, precisely set the torque value of the torque wrench 110 to the same torque as the factory standard torque of the lower injector bushing; then, according to the rotation direction required for disassembly, operate the torque wrench 110 to apply the torque. This set torque is then effectively transmitted to the circumference of the lower injector bushing through the ring sleeve 4, allowing the lower bushing to rotate smoothly under the tight ring sleeve condition.
[0059] 5. Disassembly Completed and Tool Retrieval: After disassembly, loosen nut 8 to loosen the two symmetrical arc-shaped clamps 6, pull out torque wrench 110, and then pull the ring sleeve 4 off the lower bushing of the injector. Finally, loosen the clamping force of the vise on the U-shaped elastic clamp 5, remove the injector, open the vise clamp, remove the U-shaped elastic clamp 5, close the vise jaws, and complete the entire disassembly process.
[0060] 6. Installation of the lower injector bushing: Connect the inner thread 15 of the protruding ring 22 of the lower bushing 2 (please refer to...). Figure 2 Precisely align the external thread 16 of the injector 1 (please refer to...). Figure 9 Then manually tighten it, and then reverse the above disassembly steps 1 to 5. Then apply torque by rotating the torque wrench 110 in the opposite direction to complete the assembly of the lower bushing 2.
[0061] Through the above working process, this utility model realizes the standard torque non-destructive disassembly and assembly of the lower bushing of the fuel injector, that is, the precise torque non-destructive rotational disassembly and assembly of the smooth surface thin-walled lower bushing.
[0062] The above description is only a specific embodiment of the present utility model. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in all methods or processes disclosed may be combined in any way except for mutually exclusive features and / or steps.
Claims
1. A non-destructive torque disassembly and assembly tool for the lower bushing of an injector, characterized in that: The device includes a torque controller (11), a locking element (14), and two symmetrical arc-shaped hoops (6). The locking element (14) is fixed on the two arc-shaped hoops (6), and the position of the locking element (14) on the arc-shaped hoops (6) is adjustable. After the two arc-shaped hoops (6) are fixed by the locking element (14), they form a ring sleeve (4) for clamping and holding the lower bushing of the injector. After the two arc-shaped hoops (6) are clamped and fixed on the lower bushing of the injector, there is a gap D between the side end faces of the two arc-shaped hoops (6), and the range of D is 1mm≤D≤2mm. A torque hole (10) adapted to the torque controller (11) is provided between the top ends of the two arc-shaped hoops (6). The torque hole (10) and the ring sleeve (4) are coaxial with the lower bushing of the injector. When the torque controller (11) is subjected to force, it can drive the ring sleeve (4) to rotate and disassemble the lower bushing of the injector through the torque hole (10).
2. The non-destructive torque disassembly and assembly tool for the lower bushing of an injector according to claim 1, characterized in that: The ring sleeve (4) has an opening (7) that is adapted to the lower bushing of the injector. The opening (7) is provided with a clamping part (13) for clamping and holding the protruding ring body of the lower bushing of the injector. The clamping part (13) is located at the lower part of the opening (7). The inner surface of the clamping part (13) is smooth. The inner diameter of the clamping part (13) of the opening (7) is equal to the outer diameter of the protruding ring body of the lower bushing of the injector.
3. The non-destructive torque disassembly and assembly tool for the lower bushing of an injector according to claim 2, characterized in that: The opening (7) is also provided with a conical abutment part (21) for abutting the lower outer conical surface structure of the lower sleeve of the injector. The conical abutment part (21) is located at the upper part of the opening (7) and is coaxial with the lower sleeve of the injector. The inner diameter of the conical abutment part (21) increases in the direction of the clamping part (13). The conical abutment part (21) is adapted to the lower outer conical surface structure of the lower sleeve of the injector.
4. The non-destructive torque disassembly and assembly tool for the lower bushing of an injector according to claim 3, characterized in that: The arc-shaped hoop (6) has a semi-cylindrical structure. The upper and lower parts of the arc-shaped hoop (6) are tapered external thread structures (9). The outer diameter of the upper part and the outer diameter of the lower part of the arc-shaped hoop (6) increase towards the middle.
5. The non-destructive torque disassembly and assembly tool for the lower bushing of an injector according to claim 4, characterized in that: The locking element (14) consists of two nuts (8) with internal threads. The internal threads of the nuts (8) are adapted to the external thread structure (9). Two symmetrical arc-shaped clamps (6) are used to clamp and hold the lower bushing of the injector through the nuts (8) and the external thread structure (9).
6. The non-destructive torque disassembly and assembly tool for the lower bushing of an injector according to claim 1, characterized in that: The torque controller (11) is a torque wrench (110). The end of the torque wrench (110) is provided with a torque plug (12) that is compatible with the torque hole (10). The torque hole (10) and the torque plug (12) are coaxial. When the torque wrench (110) is subjected to force, it inserts into the torque hole (10) through the torque plug (12) to drive the ring sleeve (4) to rotate and disassemble the lower bushing of the injector.
7. A non-destructive torque disassembly and assembly tool for a lower bushing of an injector according to claim 6, characterized in that: The top of each of the two arc-shaped hoops (6) is provided with an axial groove (100). The cross-section of the axial groove (100) is U-shaped, and the U-shaped opening faces the axis of the arc-shaped hoops (6). The torque hole (10) is formed by the cooperation of the two arc-shaped hoops (6) with the axial groove (100).
8. A non-destructive torque disassembly and assembly tool for a lower bushing of an injector according to claim 6, characterized in that: The torque hole (10) and torque plug (12) are rectangular structures.
9. A non-destructive torque disassembly and assembly tool for a lower bushing of an injector according to any one of claims 1-8, characterized in that: The non-destructive torque disassembly tool also includes a U-shaped elastic clamp (5) for holding the injector in a vise.
10. A non-destructive torque disassembly and assembly tool for a lower bushing of an injector according to claim 9, characterized in that: The U-shaped elastic clamp (5) is made of spring steel.