Oil rail oil injector connecting structure
By setting the positioning pin, pin hole, slot, partition and anti-rotating nose in the oil rail injector connection structure, the problem of external force interference during assembly and use of the oil rail injector is solved, and good sealing effect and installation simplicity is achieved.
Patent Information
- Application Number
- CN202422410304.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The prior art cannot effectively deal with excessive external interference caused by the oil rail injector during assembly and use, resulting in the sealing ring being easily damaged and unable to maintain a good sealing state.
The oil rail injector connection structure is adopted, including oil rail, cup holder, fuel injector and sealing ring. By setting positioning pins, pin holes and slots on the cup holder and fuel injector, the sealing ring is protected by the partition and anti-rotating nose structure to avoid damage during installation.
It effectively avoids axial rush, radial movement and swing caused by external forces, maintains a good sealing state, eliminates the risk of fuel leakage, and simplifies the installation process to avoid damage to the sealing ring.
Smart Images
Figure CN223035156U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, and more specifically, to a connection structure between an oil rail and an injector. Background Art
[0002] In-cylinder direct injection engines improve the power performance and fuel economy of the engines by directly injecting fuel into the cylinders. Since high pressure is generated by the compressed gas in the cylinders, the pressure of the fuel direct injection system usually reaches dozens of megapascals, which puts strict requirements on the sealing performance of the system. When excessive unbalanced forces are applied during the assembly process of the oil rail injector assembly, or when the vibration is too large during the operation of the engine, the centering effect between the injector and the oil rail cup seat will be damaged, resulting in the compression ring being offset, deformed or damaged. In severe cases, fuel leakage may occur, affecting the normal operation of the engine and vehicle safety.
[0003] In the current technology, in order to strictly center the injector and the oil rail cup seat to achieve a good sealing effect, the following two methods are often used: One method is to use multiple O-rings, which improves the centering effect to a certain extent, but cannot cope with the interference of excessive external forces; the other method is to use a threaded connection to achieve good centering, but the structure is too complex, and during the process of screwing in the thread, the compression ring is easily deformed and damaged. Summary of the Utility Model
[0004] The purpose of the utility model is to overcome the deficiencies of the prior art that it cannot cope with the interference of excessive external forces and the compression ring is easily deformed and damaged during the installation process, and to provide a connection structure between an oil rail and an injector, which can cope with the interference of excessive external forces and will not damage the compression ring during the installation process.
[0005] To solve the above technical problems, the technical solution adopted by the utility model is:
[0006] Provide a connection structure between an oil rail and an injector, including an oil rail, a cup seat, an injector and a compression ring. The cup seat is arranged on the oil rail, the injector is placed in the cup seat, the injector is communicated with the oil rail through the cup seat, the compression ring is arranged between the cup seat and the injector, and both the cup seat and the injector are hermetically connected with the compression ring; it further includes a positioning pin. A pin hole is arranged on the cup seat, a clamping groove is arranged on the injector, and the positioning pin is inserted into the pin hole and the clamping groove.
[0007] The connection structure of the fuel rail injector of the present utility model, when installing the injector, the injector is placed into the cup seat, and the sealing ring is located between the cup seat and the injector to form a seal. The injector is further placed into the cup seat to make the positions of the pin holes and the card slots correspond to each other. The positioning pins are passed through the pin holes and the card slots to fix the position of the injector in the cup seat. The structure is simple and the installation process is simple, and the sealing ring will not be damaged during the installation process. By setting the positioning pins, good centering of the injector and the cup seat is ensured, and the connection stability is improved. It can effectively avoid the influence of unbalanced forces and vibrations on the fuel rail injector during assembly and engine operation, effectively avoid axial movement, radial movement and swing caused by external forces, can cope with the interference of excessive external forces, and can maintain a good sealing state to eliminate the risk of fuel leakage.
[0008] Further, a plurality of the positioning pins, the pin holes and the card slots are provided. Through a plurality of pin holes and card slots, and by inserting a plurality of positioning pins, the centering effect can be better.
[0009] Further, the positioning pin is set as a U-shaped pin, two pin holes are provided, and the card slot is set as a U-shaped groove; the U-shaped pin is inserted into the U-shaped groove, and both ends respectively pass through the two pin holes. By setting the U-shaped pin and the U-shaped groove, the positioning accuracy can be improved, and the movement, rotation and swing of the injector can be better restricted.
[0010] Further, the positioning pin is set as a U-shaped pin, two pin holes are provided, and the card slot is set as an annular groove; the U-shaped pin is inserted into the annular groove, and both ends respectively pass through the two pin holes. The annular groove can be conveniently realized by cutting on the injector. The process is simple, the manufacturing difficulty is reduced, and the production efficiency is high.
[0011] Further, it further includes an anti-rotation nose, one end of the anti-rotation nose is connected to the injector, and the other end of the anti-rotation nose is located between the two ends of the U-shaped pin. When installing, the anti-rotation nose is located between the U-shaped pins to restrict the rotation of the injector around the axis. The installation is simple and the structure is simple.
[0012] Further, the injector sequentially includes a first installation part and a second installation part from the communication end of the cup seat and the fuel rail to the opening end of the cup seat. The sealing ring is sleeved on the first installation part, and the card slot is arranged on the second installation part. Making the sealing ring close to the communication end of the cup seat and the fuel rail can improve the sealing effect.
[0013] Further, the injector further includes a partition part, and the partition part is located between the first installation part and the second installation part. By setting the partition part, the sealing ring and the positioning pins are separated to prevent the positioning pins from colliding with the sealing ring and damaging the sealing ring during installation.
[0014] Further, the outer diameter of the separating portion is equal to the inner diameter of the cup seat. When the fuel injector is inserted into the cup seat, the separating portion abuts and slides inside the cup seat, which can assist in restricting the radial movement of the fuel injector along the cup seat and can play a guiding role during the assembly process, making it more conducive to the automatic centering of the fuel injector.
[0015] Further, the first mounting portion sequentially includes a limiting portion, a sleeving portion, and a sealing portion. The sealing portion is located between the sleeving portion and the second mounting portion. The outer diameter of the sealing portion gradually increases from the sleeving portion to the second mounting portion. The sealing ring is sleeved on the sleeving portion and the sealing portion, and the sealing ring is sealingly connected to the sealing portion. The position of the sealing ring is limited by the limiting portion, and the sealing ring can better contact and cooperate with the fuel injector through the sealing portion, so as to facilitate the sealing ring to form a good sealing surface.
[0016] Further, the sealing ring is in interference fit with both the fuel injector and the cup seat. This allows the sealing ring to form two inner and outer sealing surfaces, enhancing the sealing effect.
[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0018] 1. For the fuel rail fuel injector connection structure of the present utility model, by setting the positioning pin, the structure is simple and the installation process is simple. The sealing ring will not be damaged during the installation process, ensuring good centering of the fuel injector and the cup seat, and improving the connection stability; it can effectively avoid the influence of unbalanced forces and vibrations on the fuel rail fuel injector during assembly and engine operation, effectively avoiding axial movement, radial movement, and swing caused by external forces, being able to cope with the interference of excessive external forces, and maintaining a good sealing state to eliminate the risk of fuel leakage.
[0019] 2. For the fuel rail fuel injector connection structure of the present utility model, by setting the card slot as an annular slot, it can be conveniently achieved by cutting on the fuel injector, with a simple process, reducing the manufacturing difficulty, and high production efficiency; by setting the anti-rotation nose to restrict the rotation of the fuel injector, it better restricts the movement, rotation, and swing of the fuel injector.
[0020] 3. For the fuel rail fuel injector connection structure of the present utility model, by setting the separating portion to separate the sealing ring and the positioning pin, so as to prevent the positioning pin from colliding with the sealing ring and damaging the sealing ring during installation; by making the outer diameter of the separating portion equal to the inner diameter of the cup seat, it can assist in restricting the radial movement of the fuel injector along the cup seat and can play a guiding role during the assembly process, making it more conducive to the automatic centering of the fuel injector. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 is a schematic structural diagram of the fuel rail fuel injector connection structure;
[0022] Figure 2It is a schematic structural diagram of the pin hole in the oil rail injector connection structure;
[0023] Figure 3 It is a schematic structural diagram of the oil rail injector connection structure in Embodiment 2;
[0024] Figure 4 It is a schematic structural diagram of the injector in Embodiment 2;
[0025] Figure 5 It is a schematic structural diagram of the oil rail injector connection structure in Embodiment 3;
[0026] Figure 6 It is a schematic structural diagram of the injector in Embodiment 3;
[0027] Figure 7 It is a schematic structural diagram of the anti-rotation positioning structure in the oil rail injector connection structure.
[0028] In the drawings: 1. Oil rail; 2. Cup seat; 201. Pin hole; 3. Injector; 301. First installation part; 311. Limiting part; 312. Sleeving part; 313. Sealing part; 302. Second installation part; 321. Card slot; 303. Partition part; 4. Sealing ring; 5. Positioning pin; 6. Anti-rotation nose. Detailed implementation manners
[0029] The following further describes the present utility model in conjunction with the detailed implementation manners. Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0030] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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, so the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0031] Embodiment 1
[0032] This embodiment is the first embodiment of an oil rail injector connection structure, as shown in Figure 1 and Figure 3As shown in the figure, it includes an oil rail 1, a cup holder 2, an injector 3 and a sealing ring 4. The cup holder 2 is arranged on the oil rail 1, the injector 3 is placed inside the cup holder 2, and the injector 3 is communicated with the oil rail 1 through the cup holder 2. Specifically, an oil hole is provided at the connection between the oil rail 1 and the cup holder 2, which enables fuel to flow from the oil rail 1 to the injector 3 through the oil hole. The sealing ring 4 is arranged between the cup holder 2 and the injector 3, and both the cup holder 2 and the injector 3 are hermetically connected to the sealing ring 4. The sealing ring 4 is an O-ring, forming a seal between the cup holder 2 and the injector 3. It also includes a positioning pin 5, and the specific shape of the positioning pin 5 is not limited here. For example, Figure 2 As shown in the figure, a pin hole 201 is provided on the cup holder 2. The pin hole 201 is a through hole, enabling the positioning pin 5 to enter the inside of the cup holder 2 through the pin hole 201 and contact the injector 3 located inside the cup holder 2. For example, Figure 3 As shown in the figure, a clamping groove 321 is provided on the injector 3, and the positioning pin 5 is inserted through the pin hole 201 and the clamping groove 321. In this embodiment, the size of the clamping groove 321 is preferably just large enough to allow the positioning pin 5 to pass through without leaving too much clearance, so as to better improve the centering effect of the injector 3, and at the same time, it can also reduce the movable space of the injector 3, effectively avoiding axial movement, radial movement and swing caused by external forces.
[0033] The working principle of the oil rail injector connection structure in this embodiment is as follows:
[0034] When installing the injector 3, place the injector 3 into the cup holder 2, and the sealing ring 4 is located between the cup holder 2 and the injector 3 to form a seal. Further place the injector 3 into the cup holder 2 to make the positions of the pin hole 201 and the clamping groove 321 correspond. Insert the positioning pin 5 through the pin hole 201 and the clamping groove 321 to fix the position of the injector 3 in the cup holder 2. Only the positioning pin 5, the pin hole 201 and the clamping groove 321 are needed to realize the restriction of the axial, radial and swing of the injector 3. The structure is simple, easy to manufacture and use, the installation process is simple, and the sealing ring will not be damaged during the installation process. By setting the positioning pin 5, the good centering of the injector 3 and the cup holder 2 can be continuously maintained, improving the connection stability. It solves the problem that during the assembly and use of the oil rail injector, since the injector 3 is floatingly installed in the cup holder 2, when it is subjected to external force impact, relative swing or movement is likely to occur between the head of the injector 3 and the cup holder 2, resulting in the sealing ring 4 being pressed, deformed or damaged, causing seal failure and fuel leakage. It can effectively avoid the influence of unbalanced force and vibration during the assembly of the oil rail injector and the operation of the engine, effectively avoid axial movement, radial movement and swing caused by external forces, can cope with the interference of excessive external forces, and can maintain a good sealing state, eliminating the risk of fuel leakage.
[0035] Embodiment Two
[0036] This embodiment is the second embodiment of an oil rail injector connection structure. On the basis of Embodiment One, in this embodiment, for example,Figure 2 and Figure 3 As shown in Figure 3 , there are multiple positioning pins 5, pin holes 201, and card slots 321. Through the multiple pin holes 201 and card slots 321, by inserting multiple positioning pins 5, the centering effect can be better. As Figure 1 and Figure 3 shown, the positioning pin 5 is a U-shaped pin, and there are two pin holes 201. The two pin holes 201 are preferably symmetrically arranged at the lower part of the cup holder 2. As Figure 4 shown, the card slot 321 is a U-shaped groove; the U-shaped pin is inserted into the U-shaped groove, and both ends pass through the two pin holes 201 respectively. The size of the U-shaped groove is the same as that of the U-shaped pin, allowing the U-shaped pin to pass through without leaving too much clearance. Pass the positioning pin 5 through the pin hole 201 and lock it in the card slot 321. The upper end face and the lower end face of the U-shaped pin are respectively abutted against the upper end face and the lower end face of the U-shaped groove. Axial positioning of the fuel injector 3 can be achieved by relying on the upper end face and the lower end face of the U-shaped groove. The rotation of the fuel injector 3 can be restricted by relying on the semi-circular surface on the outer diameter of the U-shaped groove. At the same time, the swing of the fuel injector 3 around its own axis can be restricted by relying on the overall U-shaped groove. By setting the U-shaped pin and the U-shaped groove, the positioning accuracy can be improved, and the movement, rotation, and swing of the fuel injector 3 can be better restricted.
[0037] As Figure 3 and Figure 4 shown, the fuel injector 3 successively includes a first installation part 301 and a second installation part 302 from the communication end of the cup holder 2 and the fuel rail 1 to the opening end of the cup holder 2. The sealing ring 4 is sleeved on the first installation part 301, and the card slot 321 is arranged on the second installation part 302. Placing the sealing ring 4 close to the communication end of the cup holder 2 and the fuel rail 1 can improve the sealing effect. The fuel injector 3 further includes a partition part 303, and the partition part 303 is located between the first installation part 301 and the second installation part 302. By setting the partition part 303, the sealing ring 4 and the positioning pin 5 are separated, so as to prevent the positioning pin 5 from colliding with the sealing ring 4 and damaging the sealing ring 4 during installation, and avoid adverse effects between the sealing ring 4 and the positioning pin 5. The outer diameter of the partition part 303 is equal to the inner diameter of the cup holder 2. This equality can also mean that the outer diameter of the partition part 303 is close to the inner diameter size of the cup holder 2, as long as the partition part 303 can provide a guiding effect on the axial movement of the fuel injector 3. When inserting the fuel injector 3 into the cup holder 2, the partition part 303 abuts and slides inside the cup holder 2, which can assist in restricting the radial movement of the fuel injector 3 along the cup holder 2 and can play a guiding role during the assembly process, making it more conducive to the automatic centering of the fuel injector 3.
[0038] As Figure 4As shown, the first installation part 301 sequentially includes a limiting part 311, a sleeving part 312, and a sealing part 313. The sealing part 313 is located between the sleeving part 312 and the second installation part 302. The outer diameter of the sealing part 313 gradually increases from the sleeving part 312 to the second installation part 302. The sealing ring 4 is sleeved on the sealing part 313. In the form of transition through the sleeving part 312 and the sealing part 313, when installing, the sealing ring 4 is first sleeved on the sleeving part 312, and the fuel injector 3 is further moved towards the inside of the cup seat 2, that is, further moved towards the connection between the cup seat 2 and the fuel rail 1. The sealing ring 4 sleeved on the sleeving part 312 will move towards the sealing part 313 due to friction, so that the sealing ring 4 is sleeved on the sealing part 313. The sealing part 313 with a gradually increasing outer diameter enables the sealing ring 4 to better contact and cooperate with the fuel injector 3, which is conducive to the sealing ring 4 forming a good sealing surface. The position of the sealing ring 4 is limited by the limiting part 311 to prevent the sealing ring 4 from detaching from the fuel injector 3 along the axial direction of the fuel injector 3. The sealing part 313 enables the sealing ring 4 to better contact and cooperate with the fuel injector 3, which is conducive to the sealing ring forming a good sealing surface. As Figure 3 shown, the sealing ring 4 is in an interference fit with both the fuel injector 3 and the cup seat 2, that is, the sealing ring 4 is interference-fitted on the sealing part 313, and the sealing ring 4 is in interference contact with the inner wall surface of the cup seat 2. The sealing ring 4 can form two inner and outer sealing surfaces, enhancing the sealing effect.
[0039] Embodiment Three
[0040] This embodiment is the third embodiment of an oil rail fuel injector connection structure. This embodiment is similar to Embodiment Two. On the basis of Embodiment One, in this embodiment, as Figure 2 and Figure 5 shown, there are multiple positioning pins 5, pin holes 201, and card slots 321. Through multiple pin holes 201 and card slots 321, by inserting multiple positioning pins 5, a better centering effect can be achieved. As Figures 5 to 7 shown, the positioning pin 5 is set as a U-shaped pin, there are two pin holes 201, and the card slot 321 is set as an annular groove; the U-shaped pin is inserted into the annular groove, and both ends pass through the two pin holes 201 respectively. The width of the annular groove is consistent with the outer diameter of the positioning pin 5. The annular groove can achieve axial positioning of the fuel injector 3 through the upper end face, lower end face, and inner wall surface, and limit the radial movement and swing of the fuel injector 3. Compared with a U-shaped groove, the annular groove can be conveniently realized by cutting on the fuel injector 3, with simple process, reduced manufacturing difficulty, and high production efficiency.
[0041] As Figure 7As shown, it further includes an anti-rotation nose 6. One end of the anti-rotation nose 6 is connected to the fuel injector 3, and the other end of the anti-rotation nose 6 is located between the two ends of the U-shaped pin. During installation, the anti-rotation nose 6 is located between the U-shaped pins. In this embodiment, the width of the anti-rotation nose 6 is preferably set to be the same as the width of the two ends of the U-shaped pin, which restricts the rotation of the fuel injector 3 around the axis, and the installation is simple and the structure is simple. The anti-rotation nose 6 can be located inside or outside the cup seat 2. In this embodiment, a limiting hole is formed between the connecting end of the U-shaped pin and the outer wall surface of the cup seat 2, and the anti-rotation nose 6 passes through the limiting hole. The outer wall surfaces of the U-shaped pin and the cup seat 2 limit the movement of the anti-rotation nose, thereby restricting the rotation of the fuel injector 3.
[0042] As Figure 5 and Figure 6 shown, the fuel injector 3 sequentially includes a first installation portion 301 and a second installation portion 302 from the communication end of the cup seat 2 and the fuel rail 1 to the open end of the cup seat 2. The sealing ring 4 is sleeved on the first installation portion 301, and the card slot 321 is provided on the second installation portion 302. Placing the sealing ring 4 close to the communication end of the cup seat 2 and the fuel rail 1 can improve the sealing effect. The fuel injector 3 further includes a separating portion 303, and the separating portion 303 is located between the first installation portion 301 and the second installation portion 302. By providing the separating portion 303, the sealing ring 4 and the positioning pin 5 are separated, so that the positioning pin 5 does not collide with the sealing ring 4 and damage the sealing ring 4 during installation, and adverse effects between the sealing ring 4 and the positioning pin 5 are avoided. The outer diameter of the separating portion 303 is equal to the inner diameter of the cup seat 2. This equality can also mean that the outer diameter of the separating portion 303 is close to the inner diameter of the cup seat 2, as long as the separating portion 303 can provide a guiding effect on the axial movement of the fuel injector 3. When the fuel injector 3 is inserted into the cup seat 2, the separating portion 303 abuts and slides inside the cup seat 2, which can assist in restricting the radial movement of the fuel injector 3 along the cup seat 2 and can play a guiding role during the assembly process, making it more conducive to the automatic centering of the fuel injector 3.
[0043] As Figure 6As shown, the first installation part 301 successively includes a limiting part 311, a sleeving part 312, and a sealing part 313. The sealing part 313 is located between the sleeving part 312 and the second installation part 302. The outer diameter of the sealing part 313 gradually increases from the sleeving part 312 to the second installation part 302. The sealing ring 4 is sleeved on the sleeving part 312 and the sealing part 313, and the sealing ring 4 is sealingly connected to the sealing part 313. Through the form of transition between the sleeving part 312 and the sealing part 313, when installing, the sealing ring 4 is first sleeved on the sleeving part 312, and when the fuel injector 3 is further moved into the interior of the cup seat 2, that is, further moved towards the connection between the cup seat 2 and the fuel rail 1, the sealing ring 4 sleeved on the sleeving part 312 will move towards the sealing part 313 due to friction, so that the sealing ring 4 is partially or completely sleeved on the sealing part 313. The sealing part 313 with a gradually increasing outer diameter enables the sealing ring 4 to better contact and cooperate with the fuel injector 3, which is conducive to the sealing ring 4 forming a good sealing surface. The position of the sealing ring 4 is limited by the limiting part 311 to prevent the sealing ring 4 from disengaging from the fuel injector 3 along the axial direction of the fuel injector 3. The sealing part 313 enables the sealing ring 4 to better contact and cooperate with the fuel injector 3, which is conducive to the sealing ring forming a good sealing surface. As Figure 3 shown, the sealing ring 4 is in interference fit with both the fuel injector 3 and the cup seat 2, that is, the sealing ring 4 is interference-fitted on the sealing part 313, and the sealing ring 4 is in interference contact with the inner wall surface of the cup seat 2. This enables the sealing ring 4 to form two inner and outer sealing surfaces, enhancing the sealing effect.
[0044] In the specific content of the above specific implementation manner, each technical feature can be combined arbitrarily without contradiction. For the sake of concise description, not all possible combinations of the above technical features are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as within the scope described in this specification.
[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.
Claims
1. A fuel rail and fuel injector connection structure, comprising a fuel rail (1), a cup holder (2), a fuel injector (3) and a sealing ring (4), wherein the cup holder (2) is arranged on the fuel rail (1), the fuel injector (3) is placed in the cup holder (2), the fuel injector (3) is connected to the fuel rail (1) through the cup holder (2), the sealing ring (4) is arranged between the cup holder (2) and the fuel injector (3), and the cup holder (2) and the fuel injector (3) are both sealed and connected to the sealing ring (4); characterized in that: It also comprises a positioning pin (5), the cup holder (2) is provided with a pin hole (201), the fuel injector (3) is provided with a slot (321), and the positioning pin (5) is inserted into the pin hole (201) and the slot (321).
2. The fuel rail injector connection structure according to claim 1, characterized in that: The positioning pin (5), the pin hole (201) and the clamping groove (321) are each provided in plurality.
3. The fuel rail injector connection structure according to claim 2, characterized in that: The positioning pin (5) is configured as a U-shaped pin, two pin holes (201) are provided, and the clamping groove (321) is configured as a U-shaped groove; the U-shaped pin is inserted into the U-shaped groove, and both ends thereof pass through the two pin holes (201) respectively.
4. The fuel rail injector connection structure according to claim 2, characterized in that: The positioning pin (5) is configured as a U-shaped pin, two pin holes (201) are provided, and the clamping groove (321) is configured as an annular groove; the U-shaped pin is inserted into the annular groove, and both ends thereof pass through the two pin holes (201) respectively.
5. The fuel rail injector connection structure according to claim 4, characterized in that: The fuel injector (3) is provided with an anti-rotation nose (6), and the anti-rotation nose (6) is located between the two ends of the U-shaped pin.
6. The fuel rail injector connection structure according to any one of claims 1 to 5, characterized in that: The fuel injector (3) comprises a first mounting portion (301) and a second mounting portion (302) in sequence from the connecting end of the cup holder (2) and the fuel rail (1) to the opening end of the cup holder (2); the sealing ring (4) is sleeved on the first mounting portion (301), and the clamping groove (321) is provided on the second mounting portion (302).
7. The fuel rail injector connection structure according to claim 6, characterized in that: The fuel injector (3) further comprises a partition (303), wherein the partition (303) is located between the first mounting portion (301) and the second mounting portion (302).
8. The fuel rail injector connection structure according to claim 7, characterized in that: The outer diameter of the partition (303) is equal to the inner diameter of the cup holder (2).
9. The fuel rail injector connection structure according to claim 6, characterized in that: The first mounting portion (301) comprises a limiting portion (311), a sleeve portion (312) and a sealing portion (313) in sequence; the sealing portion (313) is located between the sleeve portion (312) and the second mounting portion (302); the outer diameter of the sealing portion (313) gradually increases from the sleeve portion (312) to the second mounting portion (302); the sealing ring (4) is sleeved on the sleeve portion (312) and the sealing portion (313); and the sealing ring (4) is sealed and connected to the sealing portion (313).
10. The fuel rail injector connection structure according to any one of claims 1 to 5, characterized in that: The sealing ring (4) is in interference fit with the fuel injector (3) and the cup seat (2).