Method for adjusting pre-tightening force of elastic member of fuel injector electromagnetic valve

Abstract

The present disclosure relates to a method for adjusting the pre-tightening force of an elastic element of an electromagnetic valve of an oil injector, comprising: assembling an adjusting element into a magnetic head of the electromagnetic valve, the adjusting element having a driving structure; adjusting the position of the adjusting element in the magnetic head by the driving structure so that the elastic element abutting against the adjusting element has an initial pre-tightening force; conducting an energization test on the electromagnetic valve, and monitoring a set parameter of the electromagnetic valve during the test; if the set parameter does not meet the requirements, adjusting the position of the adjusting element by the driving structure so that the elastic element is adjusted from the initial pre-tightening force to a target pre-tightening force; if the set parameter meets the requirements, keeping the position of the adjusting element unchanged, at this time, the initial pre-tightening force is the target pre-tightening force. The adjusting method of the present disclosure can solve the problems in the related art that the adjusting of the pre-tightening force of the elastic element of the electromagnetic valve is complicated and time-consuming, and reduces the production efficiency of the electromagnetic valve.

Description

Technical Field

[0001] This disclosure relates to the field of fuel injector technology, and in particular to a method for adjusting the preload of the elastic element of a fuel injector solenoid valve. Background Technology

[0002] The solenoid valve of the fuel injector is one of the most critical actuators in the electronic fuel injection system. It is mainly used to accurately convert the electrical signals sent by the ECU (Engine Control Unit) into mechanical actions, thereby controlling the timing and quantity of fuel injection.

[0003] However, during the production and power-on testing of solenoid valves, the adjustment of the spring preload is complicated, time-consuming, and inefficient. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the aforementioned background or related technologies.

[0005] To address this issue, this disclosure provides a method for adjusting the preload of the elastic element in an injector solenoid valve. This method solves the problems in related technologies, such as cumbersome and time-consuming procedures that reduce the production efficiency of solenoid valves when adjusting the preload of the elastic element.

[0006] The method for adjusting the preload of the injector solenoid valve elastic element disclosed herein includes: The adjusting component is assembled into the magnetic head of the solenoid valve, and the adjusting component has a drive structure; The position of the adjusting member within the magnetic head is adjusted by the driving structure so that the elastic member abutting against the adjusting member has an initial preload force; The solenoid valve is subjected to an energization test, and the set parameters of the solenoid valve are monitored during the test. If the set parameters do not meet the requirements, the position of the adjusting member is adjusted by the driving structure so that the elastic member is adjusted from the initial preload to the target preload. If the set parameters meet the requirements, the position of the adjusting member remains unchanged. At this time, the initial preload is the target preload.

[0007] In some technical solutions, the adjusting member is threadedly fitted inside the magnetic head, and the adjusting member is rotated manually or by an external driving device to adjust its position inside the magnetic head.

[0008] In some technical solutions, when the solenoid valve is energized for testing, the solenoid valve is placed on an online testing system, which includes the external driving device. If the set parameters detected by the online testing system do not meet the requirements, the external drive device is driven to operate to adjust the position of the adjusting member.

[0009] In some technical solutions, the set parameter is the opening current of the solenoid valve.

[0010] In some technical solutions, the failure of the set parameters to meet the requirements includes a first situation and a second situation. The first situation is when the turn-on current is greater than a first threshold, and the second situation is when the turn-on current is less than a second threshold. The first threshold is greater than the second threshold. If the set parameter is in either the first situation or the second situation, the position of the adjusting member is adjusted.

[0011] In some technical solutions, if the first scenario is true, and the initial preload is greater than the target preload, then the adjusting member is adjusted in a direction away from the elastic member. If it is the second case, and the initial preload is less than the target preload, then the adjusting member is adjusted towards the elastic member.

[0012] In some technical solutions, the setting parameters meet the requirements when the difference between the initial preload and the target preload is less than or equal to a preset difference.

[0013] In some technical solutions, if the set parameters do not meet the requirements, adjusting the position of the adjusting element includes: The position of the adjusting component is adjusted at least once. After each adjustment, the solenoid valve is re-energized and the set parameters are monitored until the set parameters meet the requirements.

[0014] In some technical solutions, a mapping relationship is established between the adjustment stroke of the adjusting member and the preload of the elastic member or the set parameter, and the position of the adjusting member is adjusted according to the mapping relationship.

[0015] In some technical solutions, after the adjusting member adjusts the preload of the elastic member to the target preload, the adjusting member is fixed inside the magnetic head.

[0016] In some technical solutions, the adjusting member is fixed by filling the space between the adjusting member and the magnetic head with an adhesive.

[0017] In some technical solutions, a locking element is installed inside the magnetic head, and the adjusting element is fixed by the frictional action applied by the locking element to the adjusting element.

[0018] In some technical solutions, both the adjusting member and the locking member are threadedly assembled inside the magnetic head, and the thread directions of the adjusting member and the locking member are opposite.

[0019] Beneficial effects: The technical solution disclosed herein has a driving structure on the adjusting component. During the energization test of the solenoid valve, the adjusting component can be directly driven to move through the driving structure, thereby adjusting the elastic preload of the elastic component. This avoids the cumbersome disassembly and assembly issues associated with the adjustment method of pushing the shim with a locking screw in related technologies, thus avoiding the problems of complicated procedures and long adjustment time during testing, and improving the testing and production efficiency of the solenoid valve. Attached Figure Description

[0020] The following description and accompanying drawings will better aid in understanding these and other features and advantages of the various embodiments disclosed herein, wherein the same reference numerals in the drawings consistently denote the same parts, wherein: Figure 1 This is a flowchart illustrating the debugging method according to this disclosure; Figure 2 This is an axial cross-sectional schematic diagram of a solenoid valve according to an embodiment of the present disclosure; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is an axial cross-sectional schematic diagram of a solenoid valve according to another embodiment of the present disclosure; Figure 5 for Figure 4 A magnified view of a portion of point B in the middle; Figure 6 for Figure 4 A magnified view of a portion of point C.

[0021] Figure label: 1-Magnetic head; 11-Through hole; 111-First threaded hole section; 112-Annular gap; 113-Second threaded hole section; 114-Enlarged hole section; 12-Sealing groove; 13-Connecting hole; 2-Elastic element; 3-Adjusting component; 30-Drive structure; 31-First hole; 32-Stud section; 33-End; 331-First end section; 332-Second end section; 34-Necked section; 35-First annular groove; 36-Second annular groove; 4-Valve needle; 41-First valve needle section; 411-Circumferential annular groove; 42-Second valve needle section; 43-Circumferential groove; 5-Armature; 51-Annular groove; 52-Inner edge; 6-coil; 7- Lock nut; 8-Locking element; 81-Second hole; 9-Seals. Detailed Implementation

[0022] The technical solutions of this disclosure will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of this disclosure with reference to the accompanying drawings is intended to explain the overall inventive concept of this disclosure and should not be construed as a limitation thereof.

[0023] It should be noted that this disclosure was made by the inventors based on the following facts, problems, and discoveries: In related technologies, the preload spring of a solenoid valve is adjusted to the target spring force through a spring force shim. After the spring force shim is installed, it needs to be locked with a locking screw.

[0024] When the solenoid valve is energized for testing, the oil level may be unqualified. In this case, the locking screw needs to be removed and the spring force washer replaced. Then the locking screw needs to be tightened again. The whole process is cumbersome and time-consuming, which affects production efficiency.

[0025] Based on the above, this disclosure proposes a method for adjusting the preload of the elastic element of an injector solenoid valve (hereinafter referred to as the adjustment method), such as... Figure 1 As shown, the debugging methods include: S1: The regulating component is assembled into the magnetic head of the solenoid valve, and the regulating component has a drive structure.

[0026] For example, the adjusting component can be a screw, etc., and the magnetic head can have a through hole, part of which can be a threaded hole. The adjusting component can be threaded into the threaded hole of the through hole. The driving structure can be a slot, hole, or other structure located at the end of the adjusting component.

[0027] After the adjustment component is assembled into the magnetic head, it can abut against the elastic element inside the magnetic head. The elastic element can be a spring. The abutting action of the adjustment component can limit the end of the elastic element.

[0028] S2: The position of the adjusting element inside the magnetic head is adjusted by the drive structure so that the elastic element that abuts against the adjusting element has an initial preload.

[0029] For example, the adjusting component can be rotated using a wrench or other tools, thereby adjusting its vertical position within the magnetic head. As the adjusting component is adjusted, when it moves to its initial position (which can be preset or the position corresponding to the number of rotations of a wrench or other tool), the preload generated by the elastic element under the abutment of the adjusting component is the initial preload.

[0030] S3: Perform an energization test on the solenoid valve, and monitor the solenoid valve's set parameters during the test. For example, after the above-mentioned regulating components are assembled to the initial position, the solenoid valve can be placed or fixed to the corresponding online testing system. The online testing system can perform an energization test on the solenoid valve, and during the energization test, electrical or non-electrical parameters such as the solenoid valve's opening current and voltage can be monitored. These monitored parameters can all be regarded as set parameters.

[0031] S4: If the set parameters do not meet the requirements, the position of the adjusting component is adjusted by the drive structure to adjust the elastic component from the initial preload to the target preload.

[0032] It should be noted that the above-mentioned online testing system may include an external drive device, which may specifically be a servo motor, etc.

[0033] If the above-mentioned monitoring settings are not within the corresponding value range, it can be determined that the settings do not meet the requirements. The control device of the online testing system can control the operation of the external drive device. The external drive device can be connected to the above-mentioned drive structure, so that the adjustment component can be driven by the external drive device, and the preload of the elastic component can be adjusted. After one or more adjustments, the preload of the elastic component can be finally adjusted to the target preload.

[0034] S5: If the set parameters meet the requirements, keep the position of the adjusting part unchanged. At this time, the initial preload is the target preload.

[0035] For example, if the monitored set parameters do not exceed the corresponding numerical range, it can be determined that the set parameters meet the requirements. At this time, the online testing system will not start the external drive device, the relative position of the adjusting component inside the magnetic head remains unchanged, and the aforementioned initial preload of the elastic component is also the target preload.

[0036] In some embodiments, the adjusting member is threadedly fitted inside the magnetic head, and its position inside the magnetic head is adjusted by manually or externally driving the adjusting member to rotate.

[0037] For example, the above embodiments have described the situation where the adjusting member is moved by an external driving device. In other embodiments, the adjusting member can also be rotated by a hand-held tool or other means, thereby achieving the movement and adjustment of the adjusting member.

[0038] The threaded assembly method not only meets the need for position adjustment of the adjusting component, but also, through the friction between the threads of the adjusting component and the magnetic head, can also achieve the positioning effect of the adjusting component in its initial position. This allows the adjusting component to be kept in the aforementioned initial position, thereby reducing the differences in the initial assembly of different solenoid valves and improving the efficiency of subsequent testing and adjustment.

[0039] In addition, the threaded assembly method can also serve as a seal, thereby preventing oil from flowing through the through-hole of the magnetic head.

[0040] In some embodiments, the set parameter is the opening current of the solenoid valve. In other embodiments, the set parameter may also be a parameter such as voltage or fuel injection quantity.

[0041] In some embodiments, setting parameters that do not meet the requirements includes a first case and a second case. The first case is when the turn-on current is greater than a first threshold, and the second case is when the turn-on current is less than a second threshold. The first threshold is greater than the second threshold.

[0042] The condition in which the set parameters meet the requirements is that the set parameters are within a certain numerical range, and the two endpoints of this numerical range can be the first threshold and the second threshold, respectively.

[0043] If the set parameter is in either the first or second scenario, the position of the adjusting element is adjusted. For example, if the monitored set parameter is greater than the first threshold or less than the second threshold, it indicates that the set parameter is not within the required numerical range, and the position of the adjusting element needs to be adjusted in both cases.

[0044] In some embodiments, if the initial preload is greater than the target preload, the adjusting member is adjusted away from the elastic member.

[0045] For example, if the monitored set parameter is greater than the first threshold mentioned above, it indicates that the initial preload of the elastic element is large, that is, the abutting force applied by the adjusting element to the elastic element is large. At this time, the adjusting element can be turned and driven to move upward, thereby reducing the abutting force applied by the adjusting element to the elastic element, so that the large initial preload can be transformed into a smaller target preload.

[0046] If it is the second case, and the initial preload is less than the target preload, then adjust the adjusting member towards the elastic member.

[0047] For example, if the monitored setting parameter is less than the second threshold mentioned above, it indicates that the initial preload of the elastic element is small, that is, the abutting force applied by the adjusting element to the elastic element is small. At this time, the adjusting element can be turned and driven to move downward, thereby increasing the abutting force applied by the adjusting element to the elastic element, so that the small initial preload can be transformed into a larger target preload.

[0048] In some embodiments, the parameter setting meets the requirements when the difference between the initial preload and the target preload is less than or equal to a preset difference.

[0049] Since the set parameters meet the requirements, they can be within the corresponding numerical range. This situation can be determined by the difference between the initial preload and the target preload. If the difference is less than the preset difference (the preset difference can be a range value determined according to the above numerical range), it indicates that the initial preload is close to the target preload, and the position of the adjusting component does not need to be adjusted.

[0050] If the difference is greater than the preset difference, it indicates that the gap between the initial preload and the target preload is large, and the position of the adjusting component needs to be adjusted.

[0051] This condition also simplifies the determination of whether adjustment is needed for the regulating component. This condition can also be used simultaneously with other determination methods, thereby improving the precision and accuracy of adjusting the regulating component.

[0052] In some embodiments, if the set parameters do not meet the requirements, adjusting the position of the adjusting member includes: adjusting the position of the adjusting member at least once, and after each adjustment of the position of the adjusting member, re-energizing the solenoid valve and monitoring the set parameters, until the set parameters meet the requirements.

[0053] For example, if the monitored opening current is not within the specified range, the adjusting element can be adjusted once, and then the solenoid valve needs to be energized and tested again. If the monitoring result of the opening current during the test still does not meet the requirements, the position of the adjusting element needs to be adjusted again, and so on, until the set parameters monitored during the energizing test meet the requirements. This ensures that the final preload of the solenoid valve's elastic element is the required preload.

[0054] In some embodiments, a mapping relationship is established between the adjustment stroke of the adjusting member and the preload or set parameter of the elastic member, and the position of the adjusting member is adjusted according to the mapping relationship.

[0055] For example, the adjustment stroke of the adjusting member can be the displacement length that the adjusting member can move along the extension direction of the through hole. The preload of the elastic member and the adjustment stroke can have a positive correlation. For example, the adjustment stroke can specifically be the amount of downward displacement that the adjusting member can make. In this case, as the adjusting member moves downward, the compression of the elastic member will gradually increase, that is, the preload of the elastic member will also gradually increase.

[0056] By establishing a positive correlation function and mapping relationship between the preload and the adjustment stroke, a positional adjustment of the adjusting component can be calculated based on this mapping relationship. Then, an external drive device, such as the one described above, can be used to adjust the component according to the predetermined position. This simplifies the overall adjustment efficiency and improves the reliability of the adjustment, thereby further enhancing production efficiency.

[0057] In some other embodiments, the above-mentioned adjustment stroke may also have a positive or negative correlation with the above-mentioned turn-on current. By determining this correlation, the displacement that the adjustment element needs to be adjusted can be calculated in advance, and then the position of the adjustment element can be adjusted according to the displacement.

[0058] In some embodiments, after the adjusting member adjusts the preload of the elastic member to the target preload, the adjusting member is fixed inside the magnetic head. For example, since the adjusting member is installed in the aforementioned through hole of the magnetic head by means of threaded assembly, the adjusting member as a whole is not completely fixed, and therefore, there is still a risk of the adjusting member moving during use.

[0059] Therefore, after adjusting the preload of the elastic element to the target preload by moving the adjusting element, the adjusting element and the magnetic head can be fixed, thereby ensuring the stability and reliability of the position of the adjusting element during use, and thus ensuring the fuel injection effect of the fuel injector.

[0060] In some embodiments, the adjustment member is fixed by filling the gap between the adjustment member and the magnetic head with an adhesive. For example, the adhesive can be an adhesive glue, etc. By filling the gap between the adjustment member and the magnetic head with the adhesive, and after the adhesive has cured, the adjustment member and the magnetic head can be bonded and fixed with the adhesive.

[0061] In some embodiments, a locking element is assembled inside the magnetic head, and the adjusting element is fixed by the frictional action applied by the locking element to the adjusting element.

[0062] For example, both the adjusting and locking components are threaded into the magnetic head, and their threads are in opposite directions. Specifically, both the adjusting and locking components can be stud structures, where the adjusting component's thread can rotate in the forward direction, and the locking component's thread can rotate in the reverse direction. When the locking component is screwed into the aforementioned through hole, it can contact and abut against the end face of the adjusting component, thereby locking and fixing the adjusting component through friction. This fixing method also facilitates subsequent disassembly and maintenance.

[0063] It should be noted that the above-described debugging method of this disclosure is based on the solenoid valve proposed in this disclosure, and the specific structure of the solenoid valve is as follows: Figures 2 to 6 As shown. For example, the solenoid valve of this disclosure includes a magnetic head 1, an elastic element 2, and an adjusting element 3.

[0064] The magnetic head 1 is provided with a through hole 11. For example, as Figure 2 As shown, the magnetic head 1 can be an integral structure. For example, the material of the magnetic head 1 can be metal and can be processed by casting or other methods.

[0065] The through-hole 11 can be the center hole of the magnetic head 1, that is, the through-hole 11 extends along the central axis of the magnetic head 1. The axis of the magnetic head 1 can be vertical, such as... Figure 2 As shown, the through hole 11 can penetrate the magnetic head 1 in the vertical direction, that is, the top opening of the through hole 11 can be located on the top side end face of the magnetic head 1, and the bottom opening of the through hole 11 can be located on the bottom side end face of the magnetic head 1.

[0066] The elastic element 2 is assembled inside the through hole 11. For example, as... Figure 2 As shown, the elastic element 2 can be a spring, and the elastic element 2 can be assembled in the middle section of the through hole 11 and extend along the vertical direction.

[0067] Adjusting member 3 is assembled inside through hole 11 and abuts against elastic member 2. For example, as Figure 2 As shown, the adjusting component 3 can be a columnar structure. The adjusting component 3 can be threaded into the through hole 11. In use, the vertical position of the adjusting component 3 can be adjusted by rotating the adjusting component 3.

[0068] In some other embodiments, the adjusting member 3 can also be assembled in the through hole 11 by means of snap-fit ​​or the like. For example, some elastic protrusions can be provided on the outer periphery of the adjusting member 3, and multiple recesses can be provided on the inner wall of the through hole 11 along the vertical direction. When the adjusting member 3 is driven to move, the adjusting member 3 can be pressed and the different elastic protrusions can be snapped into the recesses of different heights.

[0069] After the adjustment member 3 of this disclosure is adjusted in vertical position, the adjustment member 3 can be maintained in the adjusted position relative to the magnetic head 1. That is, the adjustment member 3 has a certain self-locking function after adjustment and will not be reset by the reverse force applied by the elastic member 2.

[0070] The adjusting member 3 of this disclosure is provided with a driving structure 30, which is adapted to drive the adjusting member 3 to move along the extension direction of the through hole 11 during the solenoid valve test so as to adjust the abutting force applied by the adjusting member 3 to the elastic member 2.

[0071] For example, such as Figure 3 As shown, the drive structure 30 can be a hole, slot, or other structure provided at the top of the adjusting member 3. When it is necessary to move the adjusting member 3, an external tool such as a motor can cooperate with the drive structure 30. For example, the motor shaft of the motor can be inserted into the drive structure 30 and engage with the drive structure 30 to prevent rotation, thereby adjusting the position of the adjusting member 3 by means of the running motor.

[0072] It should be noted that a valve needle 4, described later, is also installed in the through hole 11. The valve needle 4 is movably installed in the through hole 11 and can reciprocate within the through hole 11 in the vertical direction. The top end of the elastic member 2 can abut against the adjusting member 3, and the bottom end of the elastic member 2 can abut against the valve needle 4.

[0073] When the position of the adjusting member 3 is adjusted in the vertical direction, the magnitude of the abutting force applied by the adjusting member 3 to the elastic member 2 is also adjusted, thereby adjusting the magnitude of the elastic preload applied by the elastic member 2 to the valve needle 4.

[0074] The solenoid valve disclosed herein has a driving structure 30 on its regulating component 3. The driving structure 30 can directly drive the regulating component 3 to move, thereby adjusting the magnitude of the elastic preload of the elastic element 2. This integrates the driving function and the function of stopping the elastic element 2 on the regulating component 3, and avoids the need to disassemble and replace the locking screw and the gasket, which is required by the adjustment method of pushing the shim with the locking screw in the related technology. This avoids the problems of cumbersome process and long adjustment time during testing, and improves production efficiency.

[0075] In some embodiments, the adjusting member 3 is provided with a first hole 31, which extends through the adjusting member 3 along its extending direction. For example, as Figure 3 As shown, the first hole 31 can extend along the central axis of the adjusting member 3. Specifically, the first hole 31 can penetrate the adjusting member 3 in the vertical direction.

[0076] A portion of the upper part of the first hole 31 can be an internal hexagonal hole, which can form the aforementioned drive structure 30. During adjustment, the motor shaft of the motor can be inserted into the internal hexagonal hole and engage with the internal hexagonal hole to prevent rotation.

[0077] The first hole 31 facilitates the installation of the aforementioned drive structure 30 and allows oil to flow along it, thus meeting subsequent usage needs. Specifically, the first hole 31 can serve as a return oil hole. A small amount of fuel from the injector may enter the solenoid valve, and this hole can return the excess fuel to the fuel tank, preventing the obstruction of this passage from affecting the normal operation of the product.

[0078] In some embodiments, the through hole 11 includes a first threaded hole section 111, the adjusting member 3 is threadedly fitted into the first threaded hole section 111, and the adjusting member 3 is position-adjustable by rotation.

[0079] For example, such as Figure 3 As shown, the first threaded hole section 111 can be located in the middle of the through hole 11. A portion of the hole wall of the through hole 11 can be provided with internal threads to form the first threaded hole section 111, and the peripheral side of the adjusting member 3 can be provided with external threads. During assembly, the adjusting member 3 can be directly threaded into the first threaded hole section 111.

[0080] During adjustment, the position of the adjusting member 3 can be adjusted by rotating it. After adjustment, the friction between the adjusting member 3 and the first threaded hole section 111 also gives the adjusting member 3 a certain self-locking function, thereby preventing it from moving on its own under the action of the elastic member 2.

[0081] In some embodiments, the solenoid valve includes an adhesive disposed within the through hole 11, and the adhesive adheres and fixes the adjusted member 3, after position adjustment, within the through hole 11.

[0082] For example, the adhesive can be a fixing glue, etc. After the position of the adjustment member 3 is adjusted, the adhesive can be filled into the through hole 11. After the adhesive is cured, at least part of the adjustment member 3 can be bonded and fixed to the inner wall of the through hole 11, thereby improving the fixing effect of the adjustment member 3 and further preventing the adjustment member 3 from moving spontaneously in the through hole 11, thus ensuring the structural stability under actual working conditions.

[0083] In some embodiments, the adjusting member 3 includes a stud section 32 and an end 33. The stud section 32 is threadedly fitted into the first threaded hole section 111, and the end 33 is connected to the stud section 32. An annular gap 112 is formed between at least a portion of the end 33 and the hole wall of the through hole 11, and an adhesive is disposed in the annular gap 112.

[0084] For example, such as Figure 3 As shown, the stud section 32 and the end 33 can be integrally formed. The outer periphery of the stud section 32 can be provided with the aforementioned external thread. The adjusting member 3 can be threaded into the aforementioned first threaded hole section 111 through the stud section 32.

[0085] The end 33 can be located above the stud section 32. The overall radial dimension of the end 33 can be smaller than the radial dimension of the stud section 32. In this way, an annular gap 112 can be defined between the end 33 and the wall of the through hole 11. The adhesive can be filled in the annular gap 112, thereby providing space for the adhesive and ensuring the contact area between the adhesive and the inner wall of the end 33 and the through hole 11, thus ensuring the fixing effect of the adhesive on the adjusting member 3.

[0086] In some embodiments, the adjusting member 3 includes a necked section 34 connected between the stud section 32 and the end 33. The radial dimension of the necked section 34 is smaller than either the radial dimension of the stud section 32 or the end 33. The necked section 34, the stud section 32, and the end 33 define a first annular groove 35 on the outer periphery of the adjusting member 3. The first annular groove 35 communicates with the annular gap 112.

[0087] For example, such as Figure 3 As shown, the necked section 34 can be integrally formed between the stud section 32 and the end 33. The radial dimension of the necked section 34 is smaller than the radial dimension of the stud section 32. At the same time, the radial dimension of the necked section 34 is also smaller than the radial dimension of the end 33.

[0088] The first annular groove 35 can be distributed on the periphery of the necked section 34, and the first annular groove 35 is located between the end faces of the stud section 32 and the end head 33 in the vertical direction.

[0089] During assembly and adjustment, the first annular groove 35 will always remain in communication with the aforementioned annular gap 112. In this way, a portion of the adhesive will enter the first annular groove 35, and this portion of the adhesive will contact the internal thread of a portion of the first threaded hole section 111. Since the contact area between the adhesive and the internal thread is large, the fixing effect of the adhesive on the adjusting member 3 is further enhanced.

[0090] In some embodiments, the end 33 includes a first end segment 331 and a second end segment 332, the second end segment 332 being located between the first end segment 331 and the stud segment 32, the radial dimension of the first end segment 331 being smaller than the radial dimension of the second end segment 332, the first end segment 331 and the second end segment 332 defining a second annular groove 36 in the circumferential direction of the end 33, the second annular groove 36 communicating with the annular gap 112.

[0091] For example, such as Figure 3 As shown, according to the different radial dimensions, the end 33 can be divided into two end segments 33, namely the first end segment 331 and the second end segment 332. The first end segment 331 can be connected to the upper side of the second end segment 332, and the aforementioned necked segment 34 can be connected to the lower side of the second end segment 332. The radial dimension of the second end segment 332 must be larger than both the first end segment 331 and the necked segment 34.

[0092] This facilitates the formation of the aforementioned first annular groove 35. Secondly, a second annular groove 36 can also be defined around the periphery of the first end section 331, specifically located on the upper side of the upper end face of the second end section 332. During assembly and adjustment, the second annular groove 36 will always remain in communication with the annular gap 112, allowing some of the adhesive to fill the second annular groove 36, thereby further enhancing the fixing effect on the adjusting member 3.

[0093] In addition, the arrangement of the first annular groove 35 and the second annular groove 36 can also cause the annular space (including the above-mentioned annular gap 112) between the adjusting member 3 and the through hole 11 to be misaligned or undulated in the radial direction. This misalignment or undulation will increase the complexity of the adhesive distribution, thereby enabling the adhesive to meet the requirements of force in various directions such as radial and axial directions, and fully improving the fixing structure strength of the adjusting member 3.

[0094] In some embodiments, the solenoid valve includes a locking member 8, which is fitted into the through hole 11 and abuts against the adjusted member 3 after position adjustment to fix the adjusted member 3.

[0095] For example, such as Figure 4 As shown, the locking member 8 can also be a columnar structure. After the position of the adjusting member 3 is adjusted, the locking member 8 can be assembled into the through hole 11. By the locking member 8 abutting against the adjusting member 3, the upward movement of the adjusting member 3 can be restricted, thereby also playing a role in fixing the adjusting member 3.

[0096] In some embodiments, the through hole 11 includes a second threaded hole section 113, and the locking member 8 is threadedly fitted into the second threaded hole section 113. The locking member 8 abuts against the adjusting member 3 by rotation.

[0097] For example, such as Figure 5 As shown, the second threaded hole section 113 can be located above the first threaded hole section 111, and the second threaded hole section 113 can also be formed by providing an internal thread on the inner wall of the through hole 11. The locking member 8 as a whole can have a screw-like structure, that is, the locking member 8 has external threads on its circumference.

[0098] During assembly, the locking member 8 can be screwed into the second threaded hole section 113 by rotation. As the locking member 8 is screwed in, it can abut against the adjusting member 3, thereby fixing the adjusting member 3.

[0099] In some embodiments, the threads of the first threaded hole section 111 and the second threaded hole section 113 have opposite directions of rotation. For example, the internal thread of the first threaded hole section 111 can be spiraled in the forward direction in a plane perpendicular to the vertical direction, while the internal thread of the second threaded hole section 113 can be spiraled in the reverse direction in a plane perpendicular to the vertical direction. This difference in thread rotation direction enables the abutting locking member 8 and adjusting member 3 to have a self-locking function, thereby further ensuring the fixing effect and stability of the adjusting member 3.

[0100] In some embodiments, the first threaded hole segment 111 and the second threaded hole segment 113 are arranged at intervals in the extension direction of the through hole 11, and the abutting position of the locking member 8 and the adjusting member 3 is located between the first threaded segment and the second threaded hole segment 113.

[0101] For example, such as Figure 5 As shown, there may be a section with a smooth inner wall between the first threaded hole section 111 and the second threaded hole section 113. When assembling the locking member 8, the abutting surfaces of the locking member 8 and the adjusting member 3 can be located within the range of this smooth hole section.

[0102] The spacing between the first spiral hole section and the second threaded hole section 113 can provide a certain margin of travel for the movement of the locking member 8, avoiding the situation where the locking member 8 cannot abut against the adjusting member 3 and fix the adjusting member 3 due to the different directions of the threads when the two threaded hole sections are in direct contact.

[0103] In some embodiments, the through hole 11 includes an enlarged section 114 located between a first threaded hole section 111 and a second threaded hole section 113, wherein the radial dimension of the enlarged section 114 is greater than the radial dimension of either the first threaded hole section 111 or the second threaded hole section 113.

[0104] For example, such as Figure 5 As shown, the enlarged hole section 114 can be disposed between the first threaded hole section 111 and the second threaded hole section 113. The radial dimension of the enlarged hole section 114 must be greater than the radial dimensions of both the first threaded hole section 111 and the second threaded hole section 113. The enlarged hole section 114 can form an outwardly expanding groove on the inner wall of the through hole 11. The mating surfaces of the locking member 8 and the adjusting member 3 can correspond to the enlarged hole section 114 in the horizontal direction.

[0105] The enlarged hole section 114 can, on the one hand, prevent the locking member 8 from being unable to move up and down and fix the adjusting member 3 due to the mismatch of the thread direction between the locking member 8 and the first threaded hole section 111; on the other hand, the enlarged hole section 114 can also provide a certain cavity structure at the docking position of the locking member 8 and the adjusting member 3, thereby providing movement space for the docking position of the locking member 8 and the adjusting member 3, avoiding the situation where the movement is easily interfered with and affected by the limited space.

[0106] In some embodiments, the radial dimension of the first threaded hole section 111 is smaller than the radial dimension of the second threaded hole section 113, and the radial dimension of the adjusting member 3 is smaller than the radial dimension of the locking member 8.

[0107] For example, such as Figure 5 As shown, the inner diameter of the first threaded hole section 111 is generally smaller than the inner diameter of the second threaded hole section 113. Correspondingly, the outer diameter of the adjusting member 3 is also smaller than the outer diameter of the locking member 8.

[0108] This difference in size allows the lower end face of the locking member 8 to fully contact the upper end face of the adjusting member 3, thereby maximizing the contact area between the locking member 8 and the adjusting member 3 and ensuring the fixing effect on the adjusting member 3.

[0109] On the other hand, due to the mismatch between the outer diameter of the locking member 8 and the inner diameter of the first threaded hole section 111, the locking member 8 has a limit position for downward movement, which can prevent the locking member 8 from being screwed into the first threaded hole section 111, and thus prevent the locking member 8 from damaging the threads of the first threaded hole section 111.

[0110] In addition, the radial dimension of the second threaded hole section 113 is larger than that of the first threaded hole section 111, which allows the adjusting member 3 to pass smoothly through the second threaded hole section 113. This facilitates the assembly of the adjusting member 3 into the first threaded hole section 111 via the second threaded hole section 113, and avoids the situation where the adjusting member 3 cannot be assembled if the radial dimension of the second threaded hole section 113 is less than or equal to that of the first threaded hole section 111.

[0111] In some embodiments, the contact surfaces of the adjusting member 3 and the locking member 8 are planar, and the adjusting member 3 is fixed by friction with the contact surface of the locking member 8.

[0112] For example, such as Figure 5 As shown, the upper end face of the adjusting member 3 and the lower end face of the locking member 8 can both be planes. This allows the interaction force between the adjusting member 3 and the locking member 8 to be a force along the vertical direction, rather than a large component force along the radial direction. This facilitates the screwing in of the locking member 8 and, consequently, the fixing of the adjusting member 3.

[0113] In some embodiments, the adjusting member 3 is provided with a first hole 31, which extends through the adjusting member 3 along the extending direction, and the locking member 8 is provided with a second hole 81, which extends through the locking member 8 along the extending direction, and the first hole 31 and the second hole 81 are connected.

[0114] For example, such as Figure 5As shown, the first hole 31 can pass through the adjusting member 3 in the vertical direction, and the second hole 81 can pass through the locking member 8 in the vertical direction. The first hole 31 and the second hole 81 can be arranged coaxially, and the first hole 31 and the second hole 81 are vertically connected. This also meets the needs of subsequent use such as oil flow.

[0115] The radial dimension of the second hole 81 is greater than the radial dimension of the first hole 31.

[0116] In some embodiments, the solenoid valve includes a valve needle 4 and an armature 5. The valve needle 4 is fitted into a through hole 11 and is movable along the extension direction of the through hole 11. An elastic element 2 is fitted between an adjusting element 3 and the valve needle 4. The elastic preload is the force applied to the valve needle 4 by the elastic element 2. The armature 5 is connected to the valve needle 4 and is located outside the through hole 11. The armature 5 and the end face of the magnetic head 1 abut against each other.

[0117] For example, such as Figure 2 and Figure 4 As shown, the valve needle 4 can be a columnar structure. The valve needle 4 can be installed in the through hole 11 and can slide back and forth in the vertical direction. The top end of the elastic member 2 can abut against the bottom side of the adjusting member 3, and the bottom end of the elastic member 2 can abut against the top end of the valve needle 4. A part of the valve needle 4 can be inserted into the elastic member 2, thereby enhancing the stability of the elastic member 2 and the valve needle 4. The valve needle 4 also plays a guiding role for the elastic member 2.

[0118] The armature 5 can be mounted on the outer periphery of the valve needle 4. For example, the assembly of the armature 5 and the valve needle 4 can be a clearance fit. In some other embodiments, the armature 5 can be fixedly connected to the valve needle 4 or an interference fit.

[0119] The overall radial dimension of the armature 5 can be larger than the diameter of the through hole 11. This allows the armature 5 to be stopped and limited by the bottom end face of the magnetic head 1.

[0120] In use, the valve needle 4 and the armature 5 can move up and down synchronously. During the upward movement, the upper surface of the armature 5 can abut against the lower end face of the magnetic head 1, thereby playing a limiting role.

[0121] In some embodiments, the valve needle 4 includes a first valve needle segment 41 and a second valve needle segment 42. The second valve needle segment 42 is connected to the end of the first valve needle segment 41 away from the elastic member 2. The elastic member 2 abuts against the first valve needle segment 41. The first valve needle segment 41 is slidably fitted into the through hole 11. The armature 5 is fitted onto the outer periphery of the second valve needle segment 42. A circumferential annular groove 411 is provided on the outer periphery of the first valve needle segment 41. The circumferential annular groove 411 extends circumferentially around the first valve needle segment 41.

[0122] For example, such as Figure 4As shown, the second valve needle segment 42 is connected to the bottom end of the first valve needle segment 41, and the elastic element 2 can abut against the top end of the first valve needle segment 41. The valve needle 4 mainly achieves overall sliding fit through the assembly of the first valve needle segment 41 and the through hole 11. The second valve needle segment 42 can be located outside the through hole 11, and the armature 5 can be clearance-fitted or fixed to the outer periphery of the second valve needle segment 42.

[0123] A circumferential groove 411 may be provided in the middle of the first valve needle section 41, and the cross-section of the circumferential groove 411 may be a semi-circular groove. The circumferential groove 411 can improve the moving speed and efficiency of the valve needle 4 in the through hole 11.

[0124] Secondly, the design of the circumferential groove 411 allows the valve needle 4 to have two guiding structures, which helps guide the movement.

[0125] In some embodiments, the radial dimension of the first valve needle segment 41 is greater than the radial dimension of the second valve needle segment 42, and a circumferential groove 43 is provided on the periphery of the end of the second valve needle segment 42 that is connected to the first valve needle segment 41, and the circumferential groove 43 is provided around the circumference of the second valve needle segment 42.

[0126] For example, such as Figure 6 As shown, the circumferential groove 43 can be a trapezoidal groove with a cross-section similar to a trapezoid. The circumferential groove 43 can correspond to the top edge of the inner hole (inner edge 52) of the inner hole of the armature 5 in the inner and outer directions. This can avoid the inner edge 52 and facilitate the assembly of the armature 5 and the valve needle 4.

[0127] Secondly, the circumferential groove 43 also facilitates the precision machining of the second valve needle section 42.

[0128] In addition, since the bottom end face of the first valve needle section 41 of the valve needle 4 needs to contact the upper end face of the armature 5, the setting of this circumferential groove 43 can prevent the rounded corner here from being too large, which would cause assembly interference, and thus effectively reduce the risk of assembly interference.

[0129] In some embodiments, an annular groove 51 is provided on the end face where the armature 5 and the magnetic head 1 abut. A coil 6 is assembled inside the magnetic head 1. The coil 6 surrounds the periphery of the through hole 11. The annular groove 51 is arranged opposite to the coil 6 in the extending direction.

[0130] For example, such as Figure 2 and Figure 4 As shown, the upper end face of the armature 5 may be provided with an annular groove 51, which may surround the periphery of the inner hole of the armature 5, and the annular groove 51 may extend around the circumference of the armature 5 in a circle.

[0131] The magnetic head 1 may be fitted with a coil 6. The coil 6 is ring-shaped and can be embedded in the magnetic head 1. For example, a groove may be provided on the bottom side of the magnetic head 1 so that the coil 6 can be embedded in the magnetic head 1 from the bottom side.

[0132] The annular groove 51 on the armature 5 can be arranged opposite to the coil 6 in the vertical direction.

[0133] The end face of armature 5 is a raised structure, specifically a small ring-shaped protrusion, designed to contact the lower end face of the magnetic head 1. This reduces the contact area and improves the closing response speed. The gap between the large surface of armature 5 and the magnetic head 1 is small. The function of the annular groove 51 is to reduce the hydraulic pressure between the large surface of armature 5 and the magnetic head 1, thereby improving the opening, closing, and response time of the product. This annular groove 51 has a positive effect on response time.

[0134] The cross-section of the annular groove 51 can be rectangular, crescent-shaped, semi-circular, etc.

[0135] It should be noted that, in this disclosure, each numerical range, except where it is explicitly stated that it does not include endpoint values, can be either endpoint values ​​or the median of each numerical range. Furthermore, the specific numerical values ​​in this disclosure are not intended to limit the corresponding size parameters in this disclosure, and all allowed values ​​are within the protection scope of this disclosure.

[0136] Although embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for adjusting the preload of the elastic element of an injector solenoid valve, comprising: The adjusting component is assembled into the magnetic head of the solenoid valve, and the adjusting component has a drive structure; The position of the adjusting member within the magnetic head is adjusted by the driving structure so that the elastic member abutting against the adjusting member has an initial preload force; The solenoid valve is subjected to an energization test, and the set parameters of the solenoid valve are monitored during the test. If the set parameters do not meet the requirements, the position of the adjusting member is adjusted by the driving structure so that the elastic member is adjusted from the initial preload to the target preload. If the set parameters meet the requirements, the position of the adjusting member remains unchanged. At this time, the initial preload is the target preload.

2. The debugging method according to claim 1, wherein: The adjusting member is threadedly fitted inside the magnetic head, and its position inside the magnetic head can be adjusted by manually or by an external driving device.

3. The debugging method according to claim 2, wherein: When performing an energization test on the solenoid valve, the solenoid valve is placed on an online testing system, which includes the external drive device. If the set parameters detected by the online testing system do not meet the requirements, the external drive device is driven to operate to adjust the position of the adjusting member.

4. The debugging method according to claim 1, wherein: The set parameter is the opening current of the solenoid valve.

5. The debugging method according to claim 4, wherein: The setting parameters not meeting the requirements include a first situation and a second situation. The first situation is when the turning current is greater than a first threshold, and the second situation is when the turning current is less than a second threshold. The first threshold is greater than the second threshold. If the set parameter is in either the first situation or the second situation, the position of the adjusting member is adjusted.

6. The debugging method according to claim 5, wherein: If the first scenario applies, and the initial preload is greater than the target preload, then the adjusting member is adjusted in a direction away from the elastic member. If it is the second case, and the initial preload is less than the target preload, then the adjusting member is adjusted towards the elastic member.

7. The debugging method according to claim 4, wherein: The condition that the set parameters meet the requirements is: the difference between the initial preload and the target preload is less than or equal to the preset difference.

8. The debugging method according to claim 1, wherein: If the set parameters do not meet the requirements, adjusting the position of the adjusting component includes: The position of the adjusting component is adjusted at least once. After each adjustment, the solenoid valve is re-energized and the set parameters are monitored until the set parameters meet the requirements.

9. The debugging method according to claim 1, wherein: Establish a mapping relationship between the adjustment stroke of the adjusting member and the preload of the elastic member or the set parameter, and adjust the position of the adjusting member according to the mapping relationship.

10. The debugging method according to any one of claims 1-9, wherein: After the adjusting member adjusts the preload of the elastic member to the target preload, the adjusting member is fixed inside the magnetic head.

11. The debugging method according to claim 10, wherein: The adjusting member is fixed by filling the space between the adjusting member and the magnetic head with adhesive.

12. The debugging method according to claim 10, wherein: A locking element is assembled inside the magnetic head, and the adjusting element is fixed by the frictional action applied by the locking element to the adjusting element.

13. The debugging method according to claim 12, wherein: Both the adjusting member and the locking member are threadedly assembled inside the magnetic head, and the threads of the adjusting member and the locking member are in opposite directions.

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