Push-pull type three-position electromagnetic valve for automobile

Abstract

The invention discloses a push-pull type three-position electromagnetic valve for an automobile, and belongs to the technical field of electromagnetic valves, the push-pull type three-position electromagnetic valve for the automobile comprises a valve body, a valve channel is arranged in the valve body, a coil is installed in the valve body, a valve core is arranged in the valve channel, a spacer bush is fixedly installed in the valve body, and an armature is slidably connected in the spacer bush; the end of the armature is connected to the end of the valve element through a thread pair, and a first spring is arranged outside the thread pair. According to the electromagnetic valve, the connecting sleeve, the ejector rod, the armature and the valve element are adopted, the service life and the maintenance period of the electromagnetic valve are effectively prolonged, failure caused by clamping stagnation faults of a traditional electromagnetic valve is one of main factors influencing the service life of the electromagnetic valve, the clamping stagnation risk is actively avoided, extra damage caused by hard clamping of the valve element and the valve channel is reduced, and the service life of the electromagnetic valve is prolonged. And the frequency of shutdown maintenance due to faults is reduced, so that the service life of the electromagnetic valve is prolonged, the maintenance cost of the whole vehicle is reduced, and the market competitiveness of the product is improved.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic valve technology, and particularly relates to a push-pull type three-position electromagnetic valve for automobiles. Background Technology

[0002] A three-position four-way directional control valve is a directional control valve consisting of a two-position four-way directional control valve and a stationary position valve. The three-position four-way directional control valve has various neutral position function forms, with its neutral position function being type M. In the working position, the inlet port P is connected to the working port B, while the working port A is connected to the return port T. The three-position four-way directional control valve can be either a spool valve or a switch valve.

[0003] Three-position four-way directional valve: This refers to a valve with three working positions and four oil ports (usually two inlets and two outlets), represented by P, T, A, and B respectively. P is the oil inlet, T is the oil return port, and A and B are connected to the upper and lower chambers of the actuator respectively. The valve is in the neutral position when it is in its natural position.

[0004] Push-pull three-position solenoid valves are key control components in automotive hydraulic and pneumatic systems, and their reliability and response accuracy directly affect the performance and safety of the entire vehicle. However, existing solenoid valves of this type generally suffer from the following technical bottlenecks in practical applications: Firstly, wear between the valve core and valve body causes movement jamming: The core actuator of a solenoid valve, the valve core, undergoes high-frequency reciprocating linear motion within the valve body to switch operating positions. During this process, sliding friction inevitably occurs between the outer surface of the valve core and the inner wall of the valve body, leading to material wear. The resulting metal or non-metal debris becomes trapped in the mating gap between the valve core and the valve body, forming abrasive particles. When the valve core moves again, these particles increase the resistance to movement, and may even cause the valve core to jam in a certain position, preventing it from accurately and smoothly reaching the preset position. In severe cases, this can cause the entire control system to malfunction.

[0005] Secondly, the problem of mid-position function failure caused by the deterioration of the return spring performance: Solenoid valves typically rely on return springs on both sides of the valve body to position the valve core in the center. In actual operation, the working position of the valve core is often not uniformly distributed, but rather biased towards one side for extended periods depending on control requirements. This causes the spring on that side to be under constant compression (or tension), while the spring on the other side remains relatively relaxed. This long-term unbalanced load can cause differences in key performance parameters such as the elastic coefficient and preload of the springs on both sides, resulting in an "asymmetric performance degradation" phenomenon. This asymmetry disrupts the original mechanical balance, preventing the valve core from accurately and reliably returning to the center position after the electromagnetic force is lost, leading to center position malfunction and affecting the system's zero-position stability and control accuracy. Based on this, the present invention designs a push-pull type three-position solenoid valve for automobiles to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a push-pull type three-position solenoid valve for automobiles in order to solve the problems mentioned above in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A push-pull type three-position solenoid valve for automobiles includes a valve body, a valve channel inside the valve body, a coil installed inside the valve body, a valve core inside the valve channel, a spacer fixedly installed inside the valve body, an armature slidably connected inside the spacer, the end of the armature being connected to the end of the valve core via a threaded pair, a first spring being provided outside the threaded pair, two plug assemblies being installed on the valve body, a support pad being installed on the inner wall of the valve body, and the helix angle of the threaded pair being greater than the friction angle.

[0008] As a further description of the above technical solution: A movable support sleeve is installed on the outside of the threaded pair. The movable support sleeve is installed on the inner wall of the valve body. The movable support sleeve includes a positioning seat, which is installed on the inner wall of the valve body. Four second springs are installed inside the positioning seat, and the second springs are installed on the outside of the threaded pair.

[0009] As a further description of the above technical solution: The first spring has a movable support mechanism at its end, which is installed outside the valve core. The movable support mechanism includes a bearing, and an extension ring is fixedly installed on the outer arc surface of the outer ring of the bearing. The extension ring is located at the end of the first spring. A fixing ring is fixedly installed on the inner arc surface of the inner ring of the bearing. The fixing ring is installed at the end of the valve core.

[0010] As a further description of the above technical solution: The threaded pair includes a connecting sleeve, which is installed at the end of the second spring. Guide grooves are provided at the connection points of the connecting sleeve and the positioning seat with the second spring. A push rod is connected to the inner wall of the connecting sleeve by ball thread. The push rod is located at the end of the armature and is fixedly connected to the end of the valve core. A shoulder is provided on the outside of the connecting sleeve, and the first spring is fixedly connected to the outside of the shoulder.

[0011] As a further description of the above technical solution: A movable guide rod is installed on the inner wall of the valve body. A compression ball head is fixedly connected to the bottom end of the movable guide rod. A circular groove is opened on the valve core. The compression ball head is located in the circular groove. The movable guide rod includes a support cylinder installed on the inner wall of the valve body. A vertical rod is slidably connected inside the support cylinder. The vertical rod is fixedly connected to the compression ball head. A third spring is sleeved on the vertical rod. The third spring is fixedly connected to the bottom of the support cylinder.

[0012] As a further description of the above technical solution: The extrusion ball head includes a ball, which is installed at the bottom of the vertical rod. The ball is covered with a ball sleeve, which is located in a circular groove.

[0013] As a further description of the above technical solution: An electromagnet is fixedly connected to the top wall of the inner support cylinder. When the coil on either side of the solenoid valve is energized, the electromagnet is energized, and the vertical rod moves upward by magnetic attraction.

[0014] As a further description of the above technical solution: The valve core has a wear-resistant coating on its shoulder, and the valve passage inner wall has a low-friction coating on the part that contacts the valve core's movement trajectory.

[0015] As a further description of the above technical solution: The positioning seat has a mounting hole on its side, and the positioning seat is installed on the inner wall of the valve body by a positioning bolt.

[0016] As a further description of the above technical solution: The surface of the ball is ground, and both the outer and inner surfaces of the ball sleeve are ground.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, a connecting sleeve, push rod, armature, and valve core are used. By setting a transmission mechanism including a threaded pair between the armature and the valve core, the linear electromagnetic force generated when the coil is energized is cleverly converted into a composite motion of "linear movement + circumferential rotation" of the valve core. When the valve core moves within the valve passage, its synchronous rotational action can effectively agitate, push away, or even crush wear debris or other impurities that may exist in the mating gap. This "self-cleaning" motion mode fundamentally avoids problems such as valve core jamming and poor movement caused by debris accumulation, greatly improving the smoothness and reliability of valve core movement; it also significantly improves the response accuracy and working stability of the solenoid valve, as the movement of the valve core is no longer affected by the randomness of debris. The invention avoids obstruction, ensuring that each position change reaches the predetermined work position accurately and quickly. This guarantees the stability and controllability of the solenoid valve's state adjustment process, avoiding control signal distortion or functional delay caused by jamming or movement delay, thereby improving the control accuracy and dynamic response performance of the entire hydraulic or pneumatic system. It also effectively extends the service life and maintenance cycle of the solenoid valve. In traditional solenoid valves, failure due to jamming is one of the main factors affecting their lifespan. This invention actively avoids the risk of jamming, reducing additional damage to the valve core and valve passage caused by hard jamming, and reducing the frequency of downtime for maintenance due to malfunctions. This not only extends the service life of the solenoid valve itself, but also reduces the maintenance cost of the entire vehicle and enhances the product's market competitiveness.

[0018] 2. In this invention, a positioning seat, a second spring, and a connecting seat are used. In traditional solenoid valves, the valve core and armature are mostly rigidly connected. This requires the valve body, valve core, and related transmission components to have extremely high machining and assembly precision. Any slight coaxiality deviation may cause the valve core to be in an eccentric position within the valve passage, resulting in unilateral contact or interference, thus causing the risk of jamming. This invention innovatively sets up a positioning seat, a second spring, and a connecting seat to construct a radial floating support structure. This structure allows the connecting seat to move slightly within the radial gap formed by the positioning seat and the valve body, achieving dynamic centering of the valve core and fundamentally reducing the probability of jamming. The second spring continuously applies a center-directing elastic preload to the connecting seat. When the valve core moves within the valve passage, if it contacts the inner wall of the valve passage due to machining errors or installation misalignment, the floating structure will immediately respond: the connecting seat will... The radial yielding, coupled with the spring force of the second spring pushing it in the opposite direction, forms an automatic centering feedback mechanism. This allows the valve core to dynamically find and maintain its position in the center of the valve passage during movement, avoiding rigid friction and compression with the valve passage wall, thus greatly reducing the probability of jamming due to eccentricity. It also reduces the stringent requirements for component precision, improving product yield and economy. Because the radial adaptive structure of this invention can actively compensate for errors, the requirements for the machining and assembly precision of core components such as the valve body, valve core, and positioning seat can be appropriately relaxed. This not only reduces the difficulty and cost of production and increases the success rate of first-time assembly, but also ensures that the solenoid valve can maintain good working condition even after long-term use due to minor gap changes caused by wear, further enhancing the reliability and service life of the product.

[0019] 3. In this invention, bearings, extension rings, and fixing rings are used. The valve core undergoes a complex motion during position adjustment. Without special measures, the first spring, which directly contacts the valve core end face, will rotate with the valve core or generate severe sliding friction with the rotating valve core end face. This frictional force increases significantly with the rotation of the valve core, not only hindering its smooth movement but also requiring the solenoid coil to provide greater driving force to overcome this resistance, resulting in slow solenoid valve response and increased energy consumption. This invention fundamentally solves the risk of component overheating and burnout caused by excessive friction. The continuously increasing frictional force means the solenoid coil needs to continuously input excessive current, leading to severe coil heating and a rapid temperature rise. Prolonged exposure to this will accelerate the aging of the coil insulation layer and may even directly burn out the coil and other driving components, posing a serious risk. To address the safety hazards, this invention cleverly solves this problem by incorporating a bearing, an extension ring, and a fixing ring. It decouples rotation from the application of elastic force, ensuring smooth and safe operation. Specifically, the fixing ring rigidly connects the inner ring of the bearing to the valve core end face, allowing the bearing to rotate synchronously with the valve core. Simultaneously, the extension ring fixes the outer ring of the bearing to the first spring. Thus, the force of the first spring is transmitted through the outer ring of the bearing, while the rotation of the valve core is borne by the inner ring. The rolling characteristics of the bearing transform the original sliding friction into minimal rolling friction, enabling the first spring to stably apply axial elastic force to the valve core even when it does not need to rotate. This "separation of dynamic and static forces" design ensures that the valve core's position adjustment process is both smooth and safe, greatly improving the reliability and service life of the solenoid valve.

[0020] 4. In this invention, an electromagnet, a vertical rod, a third spring, a ball, a ball sleeve, and a circular groove are used. Traditional solenoid valves rely on the perfect symmetry of the return springs on both sides to ensure the valve core returns to center. However, over long-term use, the performance of the springs inevitably varies, leading to inaccurate valve core centering and zero-position drift. This invention innovatively introduces an "active centering mechanism" composed of a third spring, a ball, a ball sleeve, and a circular groove. When the valve core is near the center position, the third spring continuously applies a downward elastic force to the ball sleeve through the ball. This force acts on the edge of the circular groove of the valve core through the ball sleeve, forming a continuous corrective torque pointing towards the center of the valve passage. Even if there is a slight imbalance in the elastic force of the first springs on both sides, this corrective torque can automatically adjust the position of the valve core, ensuring that it is accurately pushed back and locked in the center position of the valve body, fundamentally solving the center position drift problem; significantly reducing the load when the valve core moves, and improving response speed and energy efficiency. Effectively, when the valve core needs to switch positions, the electromagnet and coil of this invention are energized synchronously. The magnetic force generated by the electromagnet immediately attracts the vertical rod, causing the ball sleeve to move upward and disengage the ball from the groove. This "electromagnetic unlocking" action instantly eliminates the additional frictional resistance that the active centering mechanism may generate when the valve core moves. This allows the valve core to move more smoothly and quickly when switching positions, only needing to overcome its own inertia and fluid resistance. This reduces the driving current of the electromagnetic coil, speeds up the response, and reduces energy consumption. Integrating the advantages of high-precision positioning and low-resistance movement, this invention perfectly solves the contradiction between "precise positioning" and "smooth movement" through the ingenious design of "power-off correction and power-on unlocking". When a stable center position needs to be maintained, the active centering mechanism intervenes to provide high-precision position locking; when rapid movement is required, the mechanism automatically retracts, eliminating movement resistance. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a push-pull type three-position solenoid valve for automobiles proposed in this invention; Figure 2 This is a three-dimensional cross-sectional structural diagram of a push-pull type three-position solenoid valve for automobiles proposed in this invention; Figure 3 This invention proposes a push-pull type three-position solenoid valve for automobiles. Figure 2 Enlarged structural diagram of section A; Figure 4 This is a three-dimensional structural diagram of the valve core of a push-pull type three-position solenoid valve for automobiles proposed in this invention; Figure 5 This is a side-view perspective three-dimensional structural diagram of the valve core of a push-pull type three-position solenoid valve for automobiles proposed in this invention; Figure 6 This is a three-dimensional cross-sectional view of the movable support sleeve of a push-pull type three-position solenoid valve for automobiles proposed in this invention; Figure 7 This is a three-dimensional cross-sectional view of the movable support mechanism of a push-pull type three-position solenoid valve for automobiles proposed in this invention; Figure 8 This is a three-dimensional cross-sectional view of the valve core structure of a push-pull type three-position solenoid valve for automobiles proposed in this invention; Figure 9 This is a three-dimensional cross-sectional view of the movable guide rod of a push-pull type three-position solenoid valve for automobiles proposed in this invention.

[0022] Legend: 1. Valve body; 2. Valve passage; 3. Valve core; 4. Coil; 5. Spacer; 6. Armature; 7. Threaded pair; 71. Connecting sleeve; 72. Push rod; 73. Shoulder; 8. First spring; 9. Support pad; 10. Movable support mechanism; 101. Bearing; 102. Extension ring; 103. Fixing ring; 11. Movable support sleeve; 111. Positioning seat; 112. Second spring; 12. Wear-resistant coating; 13. Low-friction coating; 14. Circular groove; 15. Movable guide rod; 151. Support cylinder; 152. Vertical rod; 153. Third spring; 154. Electromagnet; 16. Extrusion ball head; 161. Ball; 162. Ball sleeve; 17. Plug assembly. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see the appendix Figure 1 - Appendix Figure 9 This invention provides a technical solution: a push-pull type three-position solenoid valve for automobiles, including a valve body 1, a valve channel 2 inside the valve body 1, a coil 4 installed inside the valve body 1, a valve core 3 inside the valve channel 2, a spacer 5 fixedly installed inside the valve body 1, an armature 6 slidably connected inside the spacer 5, the end of the armature 6 being connected to the end of the valve core 3 via a threaded pair 7, a first spring 8 being provided outside the threaded pair 7, two plug assemblies 17 being installed on the valve body 1, a support pad 9 being installed on the inner wall of the valve body 1, and the helix angle of the threaded pair 7 being greater than the friction angle.

[0025] When the valve core 3 moves inside the valve channel 2, debris may get stuck between the valve core 3 and the valve channel 2, preventing the valve core 3 from moving smoothly to adjust its working position. When the coil 4 is energized, it will drive the valve core 3 to move through the threaded pair 7. When the threaded pair 7 moves, its interior will rotate, which will control the horizontal movement of the valve core 3 while rotating it. The valve core 3 can rotate and move inside the valve channel 2, avoiding the situation where the valve core 3 gets stuck during the movement.

[0026] A movable support sleeve 11 is installed on the outside of the threaded pair 7. The movable support sleeve 11 is installed on the inner wall of the valve body 1. The movable support sleeve 11 includes a positioning seat 111. The positioning seat 111 is installed on the inner wall of the valve body 1. Four second springs 112 are installed inside the positioning seat 111. The second springs 112 are installed on the outside of the threaded pair 7.

[0027] The traditional fixed connection between the valve core 3 and the armature 6 results in the valve core 3 being fixed in a certain position inside the valve passage 2. Due to the installation accuracy or the machining accuracy of the valve core 3, the valve core 3 may get stuck in a certain position inside the valve passage 2. The setting of the positioning seat 111 and the second spring 112 allows the threaded pair 7 to move radially to a certain extent, which facilitates the dynamic adjustment of the valve core 3 inside the valve passage 2, so that the valve core 3 can be adjusted to the center position of the valve passage 2, reducing the probability of the valve core 3 getting stuck.

[0028] The first spring 8 has a movable support mechanism 10 at its end. The movable support mechanism 10 is installed outside the valve core 3. The movable support mechanism 10 includes a bearing 101. An extension ring 102 is fixedly installed on the outer arc surface of the outer ring of the bearing 101. The extension ring 102 is located at the end of the first spring 8. A fixing ring 103 is fixedly installed on the inner arc surface of the inner ring of the bearing 101. The fixing ring 103 is installed at the end of the valve core 3.

[0029] When the coil 4 is energized, the first spring 8 is compressed and shortened, and is pressed more tightly against one end of the valve core 3. When the valve core 3 rotates and moves to the left, the friction between the first spring 8 and the rotating valve core 3 gradually increases due to the compression of the first spring 8 on the left side. This makes it more difficult to adjust the position of the valve core 3, and the current required for the armature 6 increases, which may even cause the components to burn out. By using the bearing 101 and the extension ring 102, the inner ring of the bearing 101 is fixed to the end face of the valve core 3 by the fixing ring 103, and the outer ring of the bearing 101 is fixedly connected to the first spring 8 by the extension ring 102. This ensures that the first spring 8 does not need to rotate during the rotation of the valve core 3, and can still apply elastic force to the valve core 3. It does not require overcoming the frictional resistance between the first spring 8 and the rotating valve core 3, and does not require a greater force to control the movement of the valve core 3 or a larger current to control the movement of the armature 6. This allows the armature 6 to operate smoothly and safely, reducing the probability of it burning out.

[0030] The threaded pair 7 includes a connecting sleeve 71, which is installed at the end of the second spring 112. Guide grooves are provided at the connection points of the connecting sleeve 71 and the positioning seat 111 with the second spring 112. A push rod 72 is connected to the inner wall of the connecting sleeve 71 by ball thread. The push rod 72 is located at the end of the armature 6 and is fixedly connected to the end of the valve core 3. A shoulder 73 is provided on the outside of the connecting sleeve 71, and the first spring 8 is fixedly connected to the shoulder 73.

[0031] Ball bearings are used for the threaded connection between the positioning seat 111 and the push rod 72, making the relative rotation process between the push rod 72 and the connecting seat smoother. The resistance during the rotation of the threaded pair 7 is reduced, and the armature 6 does not need to overcome a large resistance when moving. This means that the solenoid valve does not need a large current when it is working, making the overall operation safer. A movable guide rod 15 is installed on the inner wall of the valve body 1. A compression ball head 16 is fixedly connected to the bottom end of the movable guide rod 15. A circular groove 14 is opened on the valve core 3. The compression ball head 16 is located in the circular groove 14. The movable guide rod 15 includes a support cylinder 151 installed on the inner wall of the valve body 1. A vertical rod 152 is slidably connected inside the support cylinder 151. The vertical rod 152 is fixedly connected to the compression ball head 16. A third spring 153 is sleeved on the vertical rod 152. The third spring 153 is fixedly connected to the bottom of the support cylinder 151.

[0032] Because the solenoid valve operates primarily on the open position of one side, the frequency of use of the two first springs 8 differs significantly. This results in different elastic forces applied by the two first springs 8 to the valve core 3. Consequently, when the two armatures 6 are de-energized, the first springs 8 cannot apply the same elastic force to the valve core 3, preventing the valve core 3 from moving precisely to the center position of the valve body 1. The third spring 153 applies a downward elastic force to the compression ball head 16, allowing the compression ball head 16 to smoothly press against the edge of the circular groove 14. When the circular groove 14 and the valve core 3 are slightly off-center from the valve passage 2, the compression ball head 16 smoothly presses against the circular groove 14, adjusting the valve core 3 to move precisely to the center position of the valve body 1. This allows the solenoid valve to smoothly and accurately complete the closing process. Even if there is a slight imbalance in the elastic forces of the two first springs 8, the position of the valve core 3 can be automatically adjusted to ensure that it is accurately pushed back and locked in the center position of the valve body 1.

[0033] The extrusion ball head 16 includes a ball 161, which is installed at the bottom of the vertical rod 152. The ball 161 is covered with a ball sleeve 162, which is located in the circular groove 14.

[0034] Traditional ball heads and grooves 14 experience sliding friction. Over long-term use, this friction causes wear on the grooves 14, altering their shape and making it impossible to precisely engage with the extrusion ball head 16 to center the valve core 3. In contrast, a ball 161 and a ball sleeve 162 are used, allowing rotation between them. When the ball sleeve 162 contacts the groove 14, it rotates on the surface of the ball 161, resulting in rolling friction between them. This improves the wear resistance of the groove 14, ensuring proper engagement between the ball sleeve 162 and the groove 14. This precise control of the valve core 3 to the center position in the valve passage 2 guarantees the accuracy and reliability of the valve core 3's movement to the center position.

[0035] An electromagnet 154 is fixedly connected to the top wall of the inner support cylinder 151. When the coil 4 on either side of the solenoid valve is energized, the electromagnet 154 is energized. When the electromagnet 154 is energized, it uses magnetic force to attract the vertical rod 152 to move upward.

[0036] If the electromagnet 154 does not attract the vertical rod to move upward, the valve body 1 will push the extrusion ball head 16 upward through the circular groove 14 when it rotates, increasing the resistance to the movement of the valve body 1 and increasing the load on the armature 6 during its movement. When the coil 4 on either side of the solenoid valve is energized, the electromagnet 154 is also energized. When the electromagnet 154 is energized, it uses magnetic force to attract the vertical rod 152 and the extrusion ball head 16 to move upward out of the circular groove 14, reducing the resistance that the valve core 3 needs to overcome during its movement, reducing the driving current of the solenoid coil, accelerating the response speed, and reducing energy consumption, thus ensuring that the solenoid valve is in a safe working state.

[0037] The shoulder of the valve core 3 is provided with a wear-resistant coating 12, and the inner wall of the valve passage 2 is provided with a low-friction coating 13 in contact with the moving trajectory of the valve core 3.

[0038] The wear-resistant coating 12 is made of polytetrafluoroethylene or polyetheretherketone polymer material. The wear-resistant coating 12 is positioned forward at the shoulder of the valve core 3, reducing the friction between the valve core 3 and the valve passage 2 in the valve body 1 during the movement process, while increasing the wear resistance of the valve core 3 itself. The wear rate of the valve core 3 during the movement process is reduced. The low-friction coating 13 is made of diamond coating, which reduces the friction between the valve core 3 and the valve passage 2, making the movement process of the valve core 3 smoother and reducing the resistance during the movement process of the valve core 3. This reduces the current and energy consumption required when the solenoid valve is working, making the overall operation safer and more energy-efficient.

[0039] The side of the positioning seat 111 has a mounting hole, and the positioning seat 111 is installed on the inner wall of the valve body 1 by a positioning bolt.

[0040] The use of a positioning bolt and mounting holes facilitates the smooth assembly of the positioning seat 111 onto the inner wall of the valve body 1.

[0041] The ball bearing surface is ground, and both the outer and inner surfaces of the ball sleeve 162 are ground.

[0042] Working principle and usage: When the opening state of the solenoid valve needs to be adjusted, the coil 4 on the right side is directly energized. At this time, the armature 6 inside the coil 4 moves to the left, and the electromagnet 154 is energized. The magnetic force generated by the electromagnet 154 attracts the vertical rod 152 and the extrusion ball 16 to move upward, and the extrusion ball 16 separates from the circular groove 14. When the armature 6 moves to the left, it will extrude the push rod 72 to move to the left. Since the push rod 72 and the connecting sleeve 71 are threaded, the push rod 72 moves to the left and drives the valve core 3 to rotate, adjusting the valve core 3 to the preset position. At the same time, the first spring 8 on the left side is compressed and shortened. The first spring 8 can be kept stable when the valve core 3 rotates through the extension coil 102, avoiding the situation where the valve core 3 has to overcome the frictional resistance between itself and the first spring 8 when it rotates. When the solenoid valve needs to be closed, the coil 4 is de-energized, and the elastic force of the two first springs 8 acts on the valve core 3, causing the valve core 3 to move to the middle position of the valve channel 2. At the same time, since the electromagnet 154 is de-energized, the elastic force of the third spring 153 drives the vertical rod 152 and the extrusion ball head 16 to move downward until the extrusion ball head 16 is in contact with the surface of the valve core 3. If the circular groove 14 does not move to the position directly below the extrusion ball head 16, it indicates that there is a slight deviation in the position of the valve core 3. At this time, the extrusion ball head 16 contacts the edge of the circular groove 14, and the elastic force will control the extrusion ball head 16 to move downward. The extrusion circular groove 14 and the valve core 3 adjust their positions so that the valve core 3 moves precisely to the middle position of the valve channel 2.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A push-pull type three-position solenoid valve for automobiles, comprising a valve body (1), characterized in that, The valve body (1) is provided with a valve passage (2), a coil (4) is installed in the valve body (1), a valve core (3) is provided in the valve passage (2), a spacer (5) is fixedly installed in the valve body (1), an armature (6) is slidably connected in the spacer (5), the end of the armature (6) is connected to the end of the valve core (3) through a threaded pair (7), a first spring (8) is provided outside the threaded pair (7), two plug assemblies (17) are installed on the valve body (1), a support pad (9) is installed on the inner wall of the valve body (1), and the helix angle of the threaded pair (7) is greater than the friction angle.

2. The push-pull type three-position solenoid valve for automobiles according to claim 1, characterized in that, A movable support sleeve (11) is installed outside the threaded pair (7). The movable support sleeve (11) is installed on the inner wall of the valve body (1). The movable support sleeve (11) includes a positioning seat (111). The positioning seat (111) is installed on the inner wall of the valve body (1). Four second springs (112) are installed inside the positioning seat (111). The second springs (112) are installed outside the threaded pair (7).

3. The push-pull type three-position solenoid valve for automobiles according to claim 1, characterized in that, The first spring (8) has a movable support mechanism (10) at its end. The movable support mechanism (10) is installed outside the valve core (3). The movable support mechanism (10) includes a bearing (101). An extension ring (102) is fixedly installed on the outer arc surface of the outer ring of the bearing (101). The extension ring (102) is located at the end of the first spring (8). A fixing ring (103) is fixedly installed on the inner arc surface of the inner ring of the bearing (101). The fixing ring (103) is installed at the end of the valve core (3).

4. A push-pull type three-position solenoid valve for automobiles according to claim 2, characterized in that, The threaded pair (7) includes a connecting sleeve (71), which is installed at the end of the second spring (112). The connecting sleeve (71) and the positioning seat (111) are both provided with guide grooves at the connection points with the second spring (112). The inner wall of the connecting sleeve (71) is connected to a push rod (72) by ball thread. The push rod (72) is located at the end of the armature (6) and is fixedly connected to the end of the valve core (3). The connecting sleeve (71) is provided with a shoulder (73), and the first spring (8) is fixedly connected to the outside of the shoulder (73).

5. A push-pull type three-position solenoid valve for automobiles according to claim 4, characterized in that, The valve body (1) has a movable guide rod (15) installed on its inner wall. The bottom end of the movable guide rod (15) is fixedly connected to a compression ball head (16). The valve core (3) has a circular groove (14) and the compression ball head (16) is located in the circular groove (14). The movable guide rod (15) includes a support cylinder (151) installed on the inner wall of the valve body (1). A vertical rod (152) is slidably connected inside the support cylinder (151). The vertical rod (152) is fixedly connected to the compression ball head (16). A third spring (153) is sleeved on the vertical rod (152). The third spring (153) is fixedly connected to the bottom of the support cylinder (151).

6. A push-pull type three-position solenoid valve for automobiles according to claim 5, characterized in that, The extrusion ball head (16) includes a ball (161), which is installed at the bottom end of the vertical rod (152). The ball (161) is covered with a ball sleeve (162), which is located in the circular groove (14).

7. A push-pull type three-position solenoid valve for automobiles according to claim 5, characterized in that, An electromagnet (154) is fixedly connected to the top wall of the inner support cylinder (151). When the coil (4) on any side of the solenoid valve is energized, the electromagnet (154) is energized. When the electromagnet (154) is energized, it uses magnetic force to attract the vertical rod (152) to move upward.

8. A push-pull type three-position solenoid valve for automobiles according to claim 1, characterized in that, The valve core (3) is provided with a wear-resistant coating (12) at the shoulder, and the valve channel (2) is provided with a low-friction coating (13) at the part in contact with the movement trajectory of the valve core (3).

9. A push-pull type three-position solenoid valve for automobiles according to claim 2, characterized in that, The side of the positioning seat (111) is provided with an installation hole, and the positioning seat (111) is installed on the inner wall of the valve body (1) by a positioning bolt.

10. A push-pull type three-position solenoid valve for automobiles according to claim 6, characterized in that, The ball surface is ground, and both the outer and inner surfaces of the ball sleeve (162) are ground.

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