Middle VVT (Variable Valve Timing) electromagnetic valve capable of preventing electromagnetic core from clamping stagnation

Abstract

The invention belongs to the technical field of VVT electromagnetic valves, and discloses a middle-mounted VVT electromagnetic valve capable of preventing clamping stagnation of an electromagnetic core. The middle-mounted VVT electromagnetic valve comprises a valve body, limiting valve plates are fixedly mounted on the left side and the right side, close to the middle, of the valve body correspondingly, valve holes are formed in the middles of the limiting valve plates correspondingly, and guide grooves are formed in the sides, relatively close to one ends, of the limiting valve plates correspondingly; a valve opening and closing assembly is arranged between the two limiting valve plates, and an electromagnetic coil is fixedly installed on one side of the middle of the valve body. By arranging the valve opening and closing assembly and matching between the electromagnetic core valve rod and the valve opening and closing assembly, the mode that a traditional electromagnetic core valve rod cuts off a channel is abandoned, cut-off is replaced with the valve opening and closing assembly, the movement direction of a sealing plug is parallel to a valve hole, and gap increase caused by vertical cut-off is avoided; fluid is cut off through relative movement between the sealing plug and the valve hole, abrasion is reduced, the probability of valve leakage is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of VVT solenoid valves, and specifically relates to a central VVT solenoid valve capable of preventing electromagnetic core jamming. Background Art

[0002] The VVT solenoid valve is the core control component of the engine variable valve timing system. Its main function is to adjust the valve opening and closing timing in real time through an electronically controlled hydraulic method to optimize the engine performance. Specifically, the valve drives the spool to move according to the duty cycle signal based on the sensor signals such as engine speed, load, and temperature received by the engine ECU, and switches the flow direction of the hydraulic oil to the advance or retard oil passages of the phaser, thereby controlling the rotation angle of the camshaft relative to the crankshaft. In the advance condition, the engine oil pushes the phaser rotor to open the valve in advance, increasing the intake air volume to improve the torque at medium and low speeds; in the retard condition, the valve overlap time is reduced to improve the power output in the high-speed condition.

[0003] The core component of a conventional VVT solenoid valve is an electromagnetic actuator composed of an electromagnetic coil and a valve stem. It mainly realizes the displacement of the valve stem through the energization of the electromagnetic coil, and closes the valve body by blocking the fluid passage with the valve stem. However, the current valve body and the passage are basically in a vertical relationship, which will cause a certain gap between the valve body and the passage after long-term use, resulting in valve leakage and urgent improvement is needed.

[0004] At the same time, since the valve body will have relative displacement during operation, the valve stem may become jammed after long-term use. In the prior art, balls are used to replace the valve stem to reduce the friction force, but after a long time, the balls will still cause jamming due to lack of lubrication, and urgent solutions are needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a central VVT solenoid valve capable of preventing electromagnetic core jamming to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: a central VVT solenoid valve capable of preventing electromagnetic core jamming, including a valve body. On the left and right sides near the middle of the valve body, limiting valve plates are fixedly installed. Valve holes are provided in the middle of the limiting valve plates. Guide grooves are provided on one side of the limiting valve plates relatively close to one end. A valve opening and closing assembly is arranged between the two limiting valve plates. On one side of the middle of the valve body, an electromagnetic coil is fixedly installed. At the top of the electromagnetic coil, a shielding cover is fixedly installed. In the middle of the electromagnetic coil, a fixing plate is fixedly installed. An electromagnetic core valve rod is movably installed in the middle of the electromagnetic coil. At the bottom end of the fixing plate, a lubricating sleeve is fixedly installed. The bottom end of the electromagnetic core valve rod passes through the bottom end of the lubricating sleeve and is connected to the valve opening and closing assembly. A limiting plate is installed at the top end of the electromagnetic core valve rod. At the top of the shielding cover, an oil delivery assembly is fixedly installed. A limiting spring is movably sleeved on the outer side of the electromagnetic core valve rod. The upper and lower ends of the limiting spring are respectively connected to the bottom end of the limiting plate and the top end of the fixing plate. A self-lubricating assembly located inside the lubricating sleeve is fixedly sleeved on the outer side of the electromagnetic core valve rod. On the left and right sides near the middle of the top end of the fixing plate, oil delivery grooves are provided. The top ends of the oil delivery grooves are communicated with the oil delivery assembly.

[0007] When the device is in normal use, the upper and lower ends of the valve body can be connected to the liquid flow channels of the engine system, and the power supply of the device is turned on. In the initial state, the two valve holes are in a conducting state, and the fluid can flow through the valve body from top to bottom and be discharged from the bottom end of the device.

[0008] As a further technical solution of the present invention, the valve opening and closing assembly includes two first fixed seats, which are symmetrically installed on both sides of the bottom end of the electromagnetic core valve rod. At the ends of the first fixed seats far from the electromagnetic core valve rod, connecting rods are respectively connected through rotating shafts. At the ends of the connecting rods far from the first fixed seats, second fixed seats are respectively connected through rotating shafts.

[0009] As a further technical solution of the present invention, limiting columns are fixedly installed at the ends of the second fixed seats far from the connecting rods. The limiting columns are movably clamped with the guide grooves. The limiting columns move up and down relative to the guide grooves. Sealing plugs are fixedly installed at the ends of the limiting columns far from the second fixed seats.

[0010] As a further technical solution of the present invention, the sealing plugs are movably sleeved with the valve holes. The sealing plugs move up and down relative to the valve holes and are mutually adapted to the valve holes.

[0011] As a further technical solution of the present invention, the electromagnetic core valve rod and the electromagnetic coil adsorb each other. When the limiting spring is stretched to the limit state, the sealing plug is located directly below the valve hole and disengages from the inside of the valve hole, and the upper and lower valve holes are in a conducting state.

[0012] When the valve body needs to be closed, the power supply of the electromagnetic coil can be turned on. At this time, the electromagnetic coil generates magnetic force and adsorbs the electromagnetic core valve stem. At this time, the electromagnetic core valve stem moves toward the electromagnetic coil, and the limit spring is stretched accordingly. At the same time, the electromagnetic core valve stem moves away from the valve body. At this time, the first fixed seat moves away from the valve body synchronously, and the two connecting rods are deflected toward the middle, and tension is applied to the two limit columns. At this time, the two limit columns are relatively close, and finally drive the two sealing plugs to be relatively close until the sealing plug is separated from the inside of the valve hole. At this time, the channel between the two valve holes is opened, and the valve body is in an open state;

[0013] When the power supply of the electromagnetic coil is cut off, the magnetic force disappears, the limit spring automatically resets, and at the same time drives the electromagnetic core valve stem to automatically reset. At this time, the two connecting rods deflect in the direction away from the middle, and finally drive the two sealing plugs to move relatively away from each other, the sealing plug and the valve hole are connected, the channel between the two valve holes is cut off, and the valve body is closed.

[0014] By providing a valve opening and closing assembly and through the cooperation between the electromagnetic core valve stem and the valve opening and closing assembly, the traditional method of using the electromagnetic core valve stem to cut off the channel is abandoned, and the valve opening and closing assembly is used instead of cutting off. The movement direction of the sealing plug is parallel to the valve hole, thereby avoiding the increase of the gap caused by vertical cutting. The fluid is cut off through the relative movement between the sealing plug and the valve hole, thereby reducing wear, reducing the probability of valve leakage, and increasing the service life.

[0015] As a further technical solution of the present invention, the self-lubricating component includes a mounting sleeve, which is fixedly sleeved with the outer side surface of the electromagnetic core valve stem, and balls are movably installed axially and evenly spaced inside the mounting sleeve. Oil inlet holes are provided on both sides of the top of the mounting sleeve. When the mounting sleeve is located at the top, the oil inlet hole is connected to the oil delivery groove.

[0016] When the solenoid valve stem moves up and down, it can synchronously drive the mounting sleeve to move up and down. At this time, the ball inside the mounting sleeve can roll and contact the inner side of the lubricating sleeve, replacing the sliding friction of the solenoid valve stem and converting it into rolling friction, thereby reducing the friction during displacement.

[0017] As a further technical solution of the present invention, the oil delivery assembly includes a temporary storage tube, the bottom end of the temporary storage tube is connected to the top end of the shielding cover, the interior of the temporary storage tube is movably sleeved with a piston plate, the bottom end of the piston plate is fixedly mounted with a piston rod located inside the temporary storage tube, the bottom end of the piston rod passes through the bottom end of the temporary storage tube and the top end of the shielding cover and is connected to the top end of the electromagnetic core valve stem.

[0018] As a further technical solution of the present invention, the top of the temporary storage pipe is fixedly connected to an oil drain valve, the top of the oil drain valve is fixedly connected to a three-way valve, the left and right ends of the three-way valve are fixedly connected to oil pipes, and the other end of the oil pipe passes through the top of the shielding cover and is connected to the oil tank.

[0019] As a further technical solution of the present invention, an oil inlet valve is fixedly connected to one side of the temporary storage tube near the top, an oil storage tank is fixedly installed on the top of the shielding cover, the oil inlet valve is connected to the oil storage tank, the oil inlet valve and the oil drain valve are both one-way valves, and the directions of the valves are inward conduction and outward blockage, and outward conduction and inward blockage, respectively.

[0020] As a further technical solution of the present invention, the electromagnetic core valve stem and the electromagnetic coil are attracted to each other, and when the limit spring is stretched to the limit state, the piston plate is at the highest point and the valves at the left and right ends of the three-way valve are opened.

[0021] When the solenoid valve stem is at the highest displacement point, that is, the valve body is in the open state, the oil inlet hole is located directly below the oil delivery groove and is connected to the oil delivery groove, and the piston rod and the piston plate are synchronously driven to move upward. At this time, the lubricating oil in the temporary storage tube can be pressed out through the oil discharge valve, and the lubricating oil enters the interior of the three-way valve, and is discharged through the oil delivery pipes at both ends of the three-way valve, and drips onto the surface of the ball through the oil delivery groove and the oil inlet hole, completing self-lubrication and further reducing friction;

[0022] When the solenoid valve stem descends, that is, the valve body is in a closed state, the piston rod and the piston plate automatically reset to complete the descent, and negative pressure is generated inside the temporary storage tube. The lubricating oil is sucked into the temporary storage tube through the oil storage tank through the oil inlet valve to complete temporary storage, thereby completing the automatic replenishment of the lubricating oil.

[0023] By utilizing the opening and closing process of the valve body, that is, utilizing the action of the electromagnetic core valve stem when being adsorbed by the electromagnetic coil to complete the automatic extraction of the lubricating oil, and acting on the self-lubricating component to achieve self-lubrication, and the resetting process of the electromagnetic core valve stem can realize the automatic replenishment of the lubricating oil, the entire self-lubricating process can be completed automatically, which can effectively reduce the friction when the valve body is opened and closed, prevent the electromagnetic core valve stem from getting stuck, improve stability, and at the same time increase the service life.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1) The present invention abandons the traditional method of using an electromagnetic core valve stem to cut off the channel by providing a valve opening and closing assembly and cooperating between the electromagnetic core valve stem and the valve opening and closing assembly. Instead, the valve opening and closing assembly is used instead of cutting off the channel. The movement direction of the sealing plug is parallel to the valve hole, thereby avoiding the increase of the gap caused by vertical cutting off. The fluid is cut off by the relative movement between the sealing plug and the valve hole, thereby reducing wear, reducing the probability of valve leakage, and increasing the service life.

[0026] (2) By utilizing the opening and closing process of the valve body, the present invention automatically discharges the lubricating oil by the action when the electromagnetic core valve stem is adsorbed by the electromagnetic coil, and acts on the self-lubricating component to achieve self-lubrication. The reset process of the electromagnetic core valve stem can realize the automatic replenishment of the lubricating oil. The whole self-lubrication process can be automatically completed, which can effectively reduce the friction during the opening and closing of the valve body, prevent the electromagnetic core valve stem from jamming, improve the stability, and at the same time extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a side cross-sectional view of the internal structure of the valve body of the present invention;

[0029] Figure 3 is a schematic diagram of the other side cross-sectional view of the internal structure of the valve body of the present invention;

[0030] Figure 4 is Figure 3 an enlarged schematic diagram of the structure at A in

[0031] Figure 5 is a cross-sectional view of the internal structure of the electromagnetic coil of the present invention;

[0032] Figure 6 is a cross-sectional view of the internal structure of the lubricating sleeve of the present invention;

[0033] Figure 7 is a separate cross-sectional view of the structure of the self-lubricating component of the present invention.

[0034] In the figure: 1, valve body; 2, limit valve plate; 3, guide groove; 4, valve hole; 5, valve opening and closing assembly; 501, first fixing seat; 502, second fixing seat; 503, connecting rod; 504, limit column; 505, sealing plug; 6, electromagnetic coil; 7, shielding cover; 8, oil storage tank; 9, self-lubricating component; 901, mounting sleeve; 902, oil inlet hole; 903, ball; 10, electromagnetic core valve stem; 11, limit spring; 12, lubricating sleeve; 13, oil delivery component; 131, temporary storage pipe; 132, piston rod; 133, piston plate; 134, oil inlet valve; 135, oil discharge valve; 136, three-way valve; 137, oil delivery pipe; 14, fixing plate; 15, oil delivery groove. DETAILED DESCRIPTION OF THE INVENTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figures 1 to 7 shown, in the embodiment of the present invention, a central VVT solenoid valve capable of preventing electromagnetic core jamming includes a valve body 1. On the left and right sides near the middle of the valve body 1, limiting valve plates 2 are fixedly installed. Valve holes 4 are opened in the middle of the limiting valve plates 2. Guide grooves 3 are opened on one side of the limiting valve plates 2 relatively close to one end. A valve opening and closing assembly 5 is arranged between the two limiting valve plates 2. On one side of the middle of the valve body 1, an electromagnetic coil 6 is fixedly installed. At the top of the electromagnetic coil 6, a shielding cover 7 is fixedly installed. In the middle of the electromagnetic coil 6, a fixing plate 14 is fixedly installed. An electromagnetic core valve rod 10 is movably installed in the middle of the electromagnetic coil 6. At the bottom of the fixing plate 14, a lubricating sleeve 12 is fixedly installed. The bottom end of the electromagnetic core valve rod 10 penetrates through the bottom end of the lubricating sleeve 12 and is connected to the valve opening and closing assembly 5. A limiting plate is installed at the top end of the electromagnetic core valve rod 10. At the top of the shielding cover 7, an oil delivery assembly 13 is fixedly installed. A limiting spring 11 is movably sleeved on the outer side of the electromagnetic core valve rod 10. The upper and lower ends of the limiting spring 11 are respectively connected to the bottom end of the limiting plate and the top end of the fixing plate 14. A self-lubricating assembly 9 located inside the lubricating sleeve 12 is fixedly sleeved on the outer side of the electromagnetic core valve rod 10. On the left and right sides near the middle of the top end of the fixing plate 14, oil delivery grooves 15 are opened. The top ends of the oil delivery grooves 15 are communicated with the oil delivery assembly 13.

[0037] When the device is in normal use, the upper and lower ends of the valve body 1 can be connected to the liquid flow channels of the engine system, and the power supply of the device is turned on. In the initial state, the two valve holes 4 are in a conducting state, and the fluid can flow through the valve body 1 from top to bottom and be discharged from the bottom end of the device.

[0038] As Figure 2 and Figure 3 as well as Figure 4As shown, the valve opening and closing assembly 5 includes a first fixed seat 501, the number of the first fixed seats 501 is two and they are symmetrically installed at the two sides of the bottom end of the electromagnetic core valve stem 10, the end of the first fixed seat 501 away from the electromagnetic core valve stem 10 is movably connected to the connecting rod 503 through a rotating shaft, the end of the connecting rod 503 away from the first fixed seat 501 is movably connected to the second fixed seat 502 through a rotating shaft, and the end of the second fixed seat 502 away from the connecting rod 503 is fixedly installed with a limiting column 504, and the limiting column 504 is movably locked with the guide groove 3. Then, the limit column 504 moves up and down relative to the guide groove 3, and a sealing plug 505 is fixedly installed at one end of the limit column 504 away from the second fixed seat 502. The sealing plug 505 and the valve hole 4 are movably connected. The sealing plug 505 moves up and down relative to the valve hole 4 and the sealing plug 505 and the valve hole 4 are adapted to each other. The electromagnetic core valve stem 10 and the electromagnetic coil 6 are adsorbed on each other, and when the limit spring 11 is stretched to the limit state, the sealing plug 505 is located directly below the valve hole 4 and is separated from the inside of the valve hole 4, and the upper and lower valve holes 4 are in a conducting state.

[0039] Embodiment: When the valve body needs to be closed, the power supply of the electromagnetic coil 6 can be turned on. At this time, the electromagnetic coil 6 generates magnetic force and adsorbs the electromagnetic core valve stem 10. At this time, the electromagnetic core valve stem 10 moves toward the electromagnetic coil 6, and the limit spring 11 is stretched. At the same time, the electromagnetic core valve stem 10 moves away from the valve body 1. At this time, the first fixed seat 501 moves away from the valve body 1 synchronously, and the two connecting rods 503 are deflected toward the middle, and tension is applied to the two limit columns 504. At this time, the two limit columns 504 are relatively close, and finally drive the two sealing plugs 505 to be relatively close, until the sealing plug 505 is separated from the inside of the valve hole 4. At this time, the channel between the two valve holes 4 is opened, and the valve body 1 is in an open state;

[0040] When the power supply of the electromagnetic coil 6 is cut off, the magnetic force disappears, the limit spring 11 automatically resets, and at the same time drives the electromagnetic core valve stem 10 to automatically reset. At this time, the two connecting rods 503 deflect in the direction away from the middle, and finally drive the two sealing plugs 505 to move relatively away from each other, the sealing plug 505 is clamped with the valve hole 4, the channel between the two valve holes 4 is cut off, and the valve body 1 is closed.

[0041] By providing a valve opening and closing component 5 and through the cooperation between the electromagnetic core valve stem 10 and the valve opening and closing component 5, the traditional method of cutting off the channel by the electromagnetic core valve stem 10 is abandoned, and the valve opening and closing component 5 is used instead of cutting off, and the movement direction of the sealing plug 505 is parallel to the valve hole 4, so as to avoid the increase of the gap caused by vertical cutting, and the fluid is cut off by the relative movement between the sealing plug 505 and the valve hole 4, thereby reducing wear, reducing the probability of valve leakage, and improving the service life.

[0042] like Figure 6and Figure 7 As shown in Figure 7 , the self-lubricating assembly 9 includes a mounting sleeve 901 which is fixedly sleeved on the outer side of the electromagnetic core valve stem 10. A plurality of balls 903 are axially and equidistantly movably installed inside the mounting sleeve 901. Oil inlet holes 902 are formed on both the left and right sides at the top of the mounting sleeve 901. When the mounting sleeve 901 is at the uppermost position, the oil inlet holes 902 communicate with the oil delivery groove 15.

[0043] When the electromagnetic core valve stem 10 moves up and down, the mounting sleeve 901 can be driven to move up and down synchronously. At this time, the balls 903 inside the mounting sleeve 901 can roll and contact the inner side surface of the lubricating sleeve 12, replacing the sliding friction of the electromagnetic core valve stem 10 with rolling friction and reducing the friction during displacement.

[0044] As Figure 1 and Figure 2 as well as Figure 5 shown in Figure 2 and Figure 5 , the oil delivery assembly 13 includes a temporary storage pipe 131. The bottom end of the temporary storage pipe 131 is connected to the top end of the shielding cover 7. A piston plate 133 is movably sleeved inside the temporary storage pipe 131. A piston rod 132 located inside the temporary storage pipe 131 is fixedly installed at the bottom end of the piston plate 133. The bottom end of the piston rod 132 penetrates through the bottom end of the temporary storage pipe 131 and the top end of the shielding cover 7 and is connected to the top end of the electromagnetic core valve stem 10. An oil discharge valve 135 is fixedly communicated with the top end of the temporary storage pipe 131. A three-way valve 136 is fixedly communicated with the top end of the oil discharge valve 135. Oil delivery pipes 137 are fixedly communicated with both the left and right ends of the three-way valve 136. The other ends of the oil delivery pipes 137 penetrate through the top end of the shielding cover 7 and are communicated with the oil delivery groove 15. An oil inlet valve 134 is fixedly communicated with one side of the temporary storage pipe 131 close to the top end. An oil storage tank 8 is fixedly installed at the top end of the shielding cover 7. The oil inlet valve 134 is communicated with the oil storage tank 8. Both the oil inlet valve 134 and the oil discharge valve 135 are one-way valves, and the directions of the valves are respectively inward conduction and outward cut-off, and outward conduction and inward cut-off. The electromagnetic core valve stem 10 and the electromagnetic coil 6 adsorb each other. When the limit spring 11 is stretched to the limit state, the piston plate 133 is at the highest point and the valves at both the left and right ends of the three-way valve 136 are opened.

[0045] Embodiment: When the electromagnetic core valve stem 10 is at the highest displacement point, that is, when the valve body 1 is in the open state, at this time, the oil inlet holes 902 are located directly below the oil delivery groove 15 and are communicated with the oil delivery groove 15. At the same time, the piston rod 132 and the piston plate 133 are driven to move upward synchronously. At this time, the lubricating oil inside the temporary storage pipe 131 can be pressed out through the oil discharge valve 135. The lubricating oil enters the inside of the three-way valve 136 and is discharged through the oil delivery pipes 137 at both ends of the three-way valve 136, and drips onto the surface of the balls 903 through the oil delivery groove 15 and the oil inlet holes 902, completing self-lubrication and further reducing friction.

[0046] When the electromagnetic core valve stem 10 descends, that is, when the valve body 1 is in the closed state, at this time, the piston rod 132 and the piston plate 133 automatically reset and complete the descent, generating a negative pressure inside the temporary storage pipe 131, and sucking lubricating oil into the temporary storage pipe 131 through the oil inlet valve 134 from the oil storage tank 8 to complete the temporary storage, thus completing the automatic replenishment of the lubricating oil.

[0047] By utilizing the opening and closing process of the valve body 1, that is, using the action when the electromagnetic core valve stem 10 is adsorbed by the electromagnetic coil 6 to complete the automatic derivation of the lubricating oil, and acting on the self-lubricating component 9 to achieve self-lubrication. The reset process of the electromagnetic core valve stem 10 can achieve the automatic replenishment of the lubricating oil. The entire self-lubrication process can be automatically completed, which can effectively reduce the friction during the opening and closing of the valve body 1, prevent the electromagnetic core valve stem 10 from getting stuck, improve stability, and at the same time increase the service life.

[0048] Working principle and usage process:

[0049] When the device is in normal use, the upper and lower ends of the valve body 1 can be connected to the liquid flow channel of the engine system, and the power supply of the device is turned on. In the initial state, the two valve holes 4 are in a conducting state, and the fluid can flow from the top to the bottom of the device through the valve body 1 and be exported from the bottom end of the device;

[0050] When it is necessary to close the valve body, the power supply of the electromagnetic coil 6 can be turned on. At this time, the electromagnetic coil 6 generates a magnetic force and adsorbs the electromagnetic core valve stem 10. At this time, the electromagnetic core valve stem 10 moves towards the electromagnetic coil 6 accordingly, and the limit spring 11 is stretched accordingly. At the same time, the electromagnetic core valve stem 10 moves away from the valve body 1. At this time, the first fixed seat 501 moves away from the valve body 1 synchronously, and both connecting rods 503 deflect towards the middle, and apply a pulling force to the two limit posts 504. At this time, the two limit posts 504 approach relatively, and finally drive the two sealing plugs 505 to approach relatively until the sealing plugs 505 are separated from the inside of the valve holes 4. At this time, the channel between the two valve holes 4 is opened, and the valve body 1 is in the open state;

[0051] When the power supply of the electromagnetic coil 6 is cut off, the magnetic force disappears, the limit spring 11 automatically resets, and at the same time drives the electromagnetic core valve stem 10 to automatically reset. At this time, the two connecting rods 503 deflect away from the middle accordingly, and finally drive the two sealing plugs 505 to move away relatively. The sealing plugs 505 are engaged with the valve holes 4, and the channel between the two valve holes 4 is cut off, completing the closing of the valve body 1;

[0052] When the electromagnetic core valve stem 10 moves up and down, it can synchronously drive the mounting sleeve 901 to move up and down. At this time, the balls 903 located inside the mounting sleeve 901 can roll, and come into contact with the inner side surface of the lubricating sleeve 12, replacing the sliding friction of the electromagnetic core valve stem 10 with rolling friction, reducing the friction during displacement;

[0053] When the electromagnetic core valve stem 10 is displaced to the highest point, that is, when the valve body 1 is in the open state, at this time, the oil inlet hole 902 is located directly below the oil delivery groove 15 and is in communication with the oil delivery groove 15. At the same time, the piston rod 132 and the piston plate 133 are synchronously driven to move upward. At this time, the lubricating oil inside the temporary storage pipe 131 can be pressed out through the oil discharge valve 135, and the lubricating oil enters the inside of the three-way valve 136 and is led out through the oil delivery pipes 137 at both ends of the three-way valve 136, and drips onto the surface of the ball 903 through the oil delivery groove 15 and the oil inlet hole 902, completing self-lubrication and further reducing friction;

[0054] When the electromagnetic core valve stem 10 descends, that is, when the valve body 1 is in the closed state, at this time, the piston rod 132 and the piston plate 133 automatically reset and descend, and a negative pressure is generated inside the temporary storage pipe 131, and the lubricating oil is sucked into the temporary storage pipe 131 through the oil inlet valve 134 from the oil storage tank 8 to complete temporary storage, completing the automatic replenishment of the lubricating oil.

[0055] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A central VVT solenoid valve capable of preventing electromagnetic core jamming, including a valve body (1), characterized in that: On both the left and right sides near the middle of the valve body (1), limit valve plates (2) are fixedly installed. Valve holes (4) are formed in the middle of the limit valve plates (2). Guide grooves (3) are formed on one side of the limit valve plates (2) relatively close to one end. A valve opening and closing assembly (5) is arranged between the two limit valve plates (2). On one side of the middle of the valve body (1), an electromagnetic coil (6) is fixedly installed. At the top of the electromagnetic coil (6), a shielding cover (7) is fixedly installed. In the middle of the electromagnetic coil (6), a fixing plate (14) is fixedly installed. An electromagnetic core valve rod (10) is movably installed in the middle of the electromagnetic coil (6). At the bottom end of the fixing plate (14), a lubricating sleeve (12) is fixedly installed. The bottom end of the electromagnetic core valve rod (10) penetrates through the bottom end of the lubricating sleeve (12) and is connected to the valve opening and closing assembly (5). A limit plate is installed at the top end of the electromagnetic core valve rod (10). At the top of the shielding cover (7), an oil delivery assembly (13) is fixedly installed. A limit spring (11) is movably sleeved on the outer side of the electromagnetic core valve rod (10). The upper and lower ends of the limit spring (11) are respectively connected to the bottom end of the limit plate and the top end of the fixing plate (14). A self-lubricating assembly (9) located inside the lubricating sleeve (12) is fixedly sleeved on the outer side of the electromagnetic core valve rod (10). On both the left and right sides near the middle of the top end of the fixing plate (14), oil delivery grooves (15) are formed. The top ends of the oil delivery grooves (15) are communicated with the oil delivery assembly (13).

2. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 1, characterized in that: The valve opening and closing assembly (5) includes first fixing seats (501). The number of the first fixing seats (501) is two, and they are symmetrically installed on both sides of the bottom end of the electromagnetic core valve rod (10). At the ends of the first fixing seats (501) away from the electromagnetic core valve rod (10), connecting rods (503) are movably connected through rotating shafts. At the ends of the connecting rods (503) away from the first fixing seats (501), second fixing seats (502) are movably connected through rotating shafts.

3. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 2, wherein: At the ends of the second fixing seats (502) away from the connecting rods (503), limit posts (504) are fixedly installed. The limit posts (504) are movably clamped with the guide grooves (3). The limit posts (504) move up and down relative to the guide grooves (3). At the ends of the limit posts (504) away from the second fixing seats (502), sealing plugs (505) are fixedly installed.

4. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 3, wherein: The sealing plugs (505) are movably sleeved with the valve holes (4). The sealing plugs (505) move up and down relative to the valve holes (4), and the sealing plugs (505) are mutually adapted to the valve holes (4).

5. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 4, wherein: The electromagnetic core valve rod (10) and the electromagnetic coil (6) adsorb each other. When the limit spring (11) is stretched to the limit state, the sealing plug (505) is located directly below the valve hole (4) and is separated from the inside of the valve hole (4), and the upper and lower valve holes (4) are in a conducting state.

6. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 1, wherein: The self-lubricating assembly (9) includes a mounting sleeve (901) fixedly sleeved on the outer side of the electromagnetic core valve stem (10). A plurality of balls (903) are movably installed in the mounting sleeve (901) at equal intervals along the axial direction. Oil inlet holes (902) are formed in the left and right sides of the top end of the mounting sleeve (901). When the mounting sleeve (901) is at the uppermost position, the oil inlet holes (902) are in communication with the oil delivery groove (15).

7. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 1, wherein: The oil delivery assembly (13) includes a temporary storage pipe (131) whose bottom end is connected to the top end of the shielding cover (7). A piston plate (133) is movably sleeved in the temporary storage pipe (131). A piston rod (132) is fixedly installed at the bottom end of the piston plate (133) inside the temporary storage pipe (131). The bottom end of the piston rod (132) penetrates through the bottom end of the temporary storage pipe (131) and the top end of the shielding cover (7) and is connected to the top end of the electromagnetic core valve stem (10).

8. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 7, wherein: A drain valve (135) is fixedly communicated with the top end of the temporary storage pipe (131). A three-way valve (136) is fixedly communicated with the top end of the drain valve (135). Oil delivery pipes (137) are fixedly communicated with the left and right ends of the three-way valve (136). The other ends of the oil delivery pipes (137) penetrate through the top end of the shielding cover (7) and are in communication with the oil delivery groove (15).

9. The center-mounted VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 8, wherein: An oil inlet valve (134) is fixedly communicated with one side of the temporary storage pipe (131) near the top end. An oil storage tank (8) is fixedly installed at the top end of the shielding cover (7). The oil inlet valve (134) is in communication with the oil storage tank (8). Both the oil inlet valve (134) and the drain valve (135) are one-way valves, and the directions of the valves are inward conduction and outward cut-off, and outward conduction and inward cut-off respectively.

10. The in - line VVT solenoid valve capable of preventing electromagnetic core jamming according to claim 9, characterized in that: The electromagnetic core valve stem (10) and the electromagnetic coil (6) attract each other. When the limit spring (11) is stretched to the limit state, the piston plate (133) is at the highest point and the valves at the left and right ends of the three-way valve (136) are opened.

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