Pilot valve of electromagnetic valve shock absorber

Abstract

The invention provides a pilot valve of an electromagnetic valve shock absorber, and relates to the technical field of electromagnetic valve shock absorbers. The pilot valve of the electromagnetic valve shock absorber comprises a piston rod, an oil storage cylinder assembly arranged at the right end of the piston rod and a compression valve assembly arranged at the right end of the oil storage cylinder assembly, the right end of the piston rod extends into the oil storage cylinder assembly, and an electromagnetic valve assembly is arranged at the right end of the piston rod. A pilot valve and circulation screw assembly is arranged on the right side of the electromagnetic valve assembly. By arranging the pilot valve and the circulation screw assembly, the length of the valve system is reduced, when the shock absorber works and the length of the working cylinder of the oil storage cylinder is the same, the effective stroke is longer, meanwhile, the pilot valve system is simpler in structure and higher in reliability, the oil return hole diameter of the circulation screw cover is larger, and the risk of foreign matter blockage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valve shock absorbers, and specifically to a pilot valve of a solenoid valve shock absorber. Background Art

[0002] The use of shock absorbers on automobile suspensions requires the cooperation of solenoid valves. In a shock absorber, the solenoid valve is used to control the inflow and outflow of oil and gas, thereby adjusting the damping force of the shock absorber to control and reduce vehicle body vibration.

[0003] For the solenoid valve shock absorber, the existing pilot valve structure is relatively complex, consisting of two-stage valve systems, opening the valve twice when reaching the pressure value. There are many valve plates in the pilot valve, resulting in high costs and inconvenient assembly. At the same time, due to the large number of valve plates, the overall size of the valve system is longer, occupying the compression stroke and rebound stroke of the shock absorber. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a pilot valve of a solenoid valve shock absorber, which solves the problems that the existing pilot valve structure is relatively complex, consists of two-stage valve systems, opens the valve twice when reaching the pressure value, has many valve plates in the pilot valve, high costs, inconvenient assembly, and at the same time, due to the large number of valve plates, the overall size of the valve system is longer, occupying the compression stroke and rebound stroke of the shock absorber.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: It includes a piston rod, an oil storage cylinder assembly arranged at the right end of the piston rod, and a compression valve assembly arranged at the right end of the oil storage cylinder assembly. The right end of the piston rod extends into the interior of the oil storage cylinder assembly. An electromagnetic valve assembly is arranged at the right end of the piston rod, and a pilot valve and a circulation screw assembly are arranged on the right side of the electromagnetic valve assembly; The pilot valve and the circulation screw assembly include a pilot valve assembly arranged on the right side of the electromagnetic valve assembly. A circulation screw is arranged on the right side of the pilot valve assembly. The pilot valve assembly includes a circulation screw cover arranged on the right side of the electromagnetic valve assembly. An inner ring band and an outer ring band are respectively arranged on the left side of the circulation screw cover. A plurality of oil return holes are opened inside the circulation screw cover. Both sides of the oil return holes penetrate through the left and right ends of the circulation screw cover. A plurality of the oil return holes are all located between the inner ring band and the outer ring band. A multi-groove valve plate is arranged on the right side of the inner ring band and the outer ring band. A first valve plate is arranged on the right side of the multi-groove valve plate. A second valve plate is arranged on the right side of the first valve plate. A third valve plate is arranged on the right side of the second valve plate. The diameter of the second valve plate is smaller than that of the first valve plate and the third valve plate. A washer is arranged on the right side of the third valve plate.

[0006] Through the above technical solutions, by setting the pilot valve and the circulation screw assembly, the length of the valve system is reduced. When the shock absorber works and the lengths of the storage oil cylinder and the working cylinder are the same, the effective stroke is longer. At the same time, the pilot valve system has a simpler structure and higher reliability, and the oil return hole diameter of the circulation screw cover is larger, reducing the risk of foreign object blockage.

[0007] Preferably, a rebound valve assembly is arranged on the outer side of the circulation screw.

[0008] Preferably, the circulation screw cover is specifically a metal machined part.

[0009] Preferably, an oil seal is arranged on the left side inside the storage oil cylinder assembly, a guide seat is arranged on the right side of the oil seal, a working cylinder is fixedly arranged inside the storage oil cylinder assembly, and an outer cavity is formed between the working cylinder and the inner wall of the storage oil cylinder assembly.

[0010] Preferably, the outer wall of the rebound valve assembly is in contact with the inner wall of the working cylinder, a lower cavity is formed on the right side of the rebound valve assembly inside the working cylinder, and an upper cavity is formed on the left side of the rebound valve assembly inside the working cylinder.

[0011] The present invention provides a pilot valve of a solenoid valve shock absorber. It has the following beneficial effects: For the pilot valve of the solenoid valve shock absorber, by setting the pilot valve and the circulation screw assembly, the length of the valve system is reduced. When the shock absorber works and the lengths of the storage oil cylinder and the working cylinder are the same, the effective stroke is longer.

[0012] For the pilot valve of the solenoid valve shock absorber, the pilot valve system has a simpler structure and higher reliability, and the oil return hole diameter of the circulation screw cover is larger, reducing the risk of foreign object blockage.

[0013] For the pilot valve of the solenoid valve shock absorber, since the oil return hole is optimized, the ring band of the circulation screw cover is reduced, and the outer diameter of the valve system becomes smaller, effectively preventing the valve disc from rubbing against the internal thread of the circulation screw cover in extreme cases and causing poor product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the external appearance display diagram of the present invention; Figure 2 is the internal display diagram of the storage oil cylinder assembly of the present invention; Figure 3 is the display diagram of the solenoid valve assembly of the present invention; Figure 4 is the structural diagram of the circulation screw cover of the present invention; Figure 5 is the side view of the circulation screw cover of the present invention; Figure 6 is the display diagram of the circulation screw of the present invention.

[0015] Among them, 1. piston rod; 2. oil seal; 3. guide seat; 4. oil storage cylinder assembly; 5. working cylinder; 6. compression valve assembly; 7. lower chamber; 8. upper chamber; 9. outer chamber; 11. solenoid valve assembly; 12. pilot valve and flow screw assembly; 13. return valve assembly; 121. pilot valve assembly; 122. flow screw; 1211. flow screw cover; 1212. multi-groove valve plate; 1213. first valve plate; 1214. second valve plate; 1215. third valve plate; 1216. washer; 1217. inner ring band; 1218. outer ring band; 1219. oil return hole. Specific embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figure 1 - Figure 6 shown, the embodiments of the present invention provide: including a piston rod 1, an oil storage cylinder assembly 4 provided at the right end of the piston rod 1, and a compression valve assembly 6 provided at the right end of the oil storage cylinder assembly 4. The right end of the piston rod 1 extends into the interior of the oil storage cylinder assembly 4. A solenoid valve assembly 11 is provided at the right end of the piston rod 1, and a pilot valve and flow screw assembly 12 is provided on the right side of the solenoid valve assembly 11; The pilot valve and flow screw assembly 12 includes a pilot valve assembly 121 provided on the right side of the solenoid valve assembly 11. A flow screw 122 is provided on the right side of the pilot valve assembly 121. The pilot valve assembly 121 includes a flow screw cover 1211 provided on the right side of the solenoid valve assembly 11. An inner ring band 1217 and an outer ring band 1218 are respectively provided on the left side of the flow screw cover 1211. A plurality of oil return holes 1219 are opened inside the flow screw cover 1211. Both sides of the oil return holes 1219 penetrate through the left and right ends of the flow screw cover 1211. The plurality of oil return holes 1219 are all located between the inner ring band 1217 and the outer ring band 1218. A multi-groove valve plate 1212 is provided on the right side of the inner ring band 1217 and the outer ring band 1218. A first valve plate 1213 is provided on the right side of the multi-groove valve plate 1212. A second valve plate 1214 is provided on the right side of the first valve plate 1213. A third valve plate 1215 is provided on the right side of the second valve plate 1214. The diameter of the second valve plate 1214 is smaller than that of the first valve plate 1213 and the third valve plate 1215. A washer 1216 is provided on the right side of the third valve plate 1215.

[0018] This product optimizes the pilot valve assembly 121 and the flow-through screw cover 1211, reducing the number of valve plates. As a result, the flow-through screw cover 1211 is easier to machine, reducing material costs and assembly time costs. The length of the valve system is decreased. When the working cylinder of the shock absorber has the same length as the oil storage cylinder during operation, the effective stroke is longer, which is more beneficial for the layout of the shock absorber on the vehicle. The oil return hole 1219 is optimized to reduce the ring band of the flow-through screw cover and the outer diameter of the valve system, effectively preventing the valve plate from scraping against the internal thread of the flow-through screw cover in extreme cases, which could cause poor product performance.

[0019] A rebound valve assembly 13 is arranged on the outer side of the flow-through screw rod 122.

[0020] The flow-through screw cover 1211 is specifically a metal machined part.

[0021] An oil seal 2 is arranged on the left side inside the oil storage cylinder assembly 4. A guide seat 3 is arranged on the right side of the oil seal 2. A working cylinder 5 is fixedly arranged inside the oil storage cylinder assembly 4. An outer cavity 9 is formed between the working cylinder 5 and the inner wall of the oil storage cylinder assembly 4.

[0022] The outer wall of the rebound valve assembly 13 contacts the inner wall of the working cylinder 5. A lower cavity 7 is formed inside the working cylinder 5 on the right side of the rebound valve assembly 13. An upper cavity 8 is formed inside the working cylinder 5 on the left side of the rebound valve assembly 13.

[0023] Working principle: When the shock absorber works, the piston rod 1 and the rebound valve assembly 13 reciprocate along the inner wall of the working cylinder 5. The lower chamber 7, upper chamber 8 and outer chamber 9 inside the shock absorber are filled with oil and compressed gas. During the movement, the oil passes through the throttling gaps of the rebound valve and compression valve to generate damping force. The solenoid valve shock absorber can control the throttling gap by changing the current magnitude, thereby controlling the damping force of the shock absorber. The pilot valve mainly affects the compression stroke of the shock absorber. During compression, the piston rod 1 and the rebound valve assembly 13 move downward along the inner wall of the working cylinder 5. At this time, since a part of the volume of the piston rod 1 moves into the cylinder, the oil pressure in the lower chamber 7 increases. The oil will flow from the high-pressure area to the low-pressure area through the throttling hole. At this time, the lower chamber 7 is the high-pressure area, the upper chamber 8 is the low-pressure area, and the outer chamber 9 is the low-pressure area. A part of the oil flows from the lower chamber 7 to the outer chamber 9 through the throttling gap of the compression valve assembly 6 to relieve pressure. A part of the oil first passes through the rebound valve assembly 13 and then through the pilot valve assembly 121 and the flow-through screw 122 and returns to the upper chamber. Since the valve system stiffness of the compression valve assembly 6 is relatively large, the flow rate of the oil flowing through this oil circuit is small, and the amount of oil passing through the rebound valve assembly 13 is large. Thus, the main compression damping force is generated. During compression, the piston rod 1 and the rebound valve assembly 13 move downward, and the oil in the lower chamber 7 is compressed, and the pressure becomes higher. The oil pushes open the core rod through the rebound valve assembly 13 and flows into the pilot valve assembly 121 from the throttling gap between the core rod and the flow-through screw 122, making the chamber between the flow-through cover 1211 and the electromagnet filled with oil. The oil will flow out from the oil return hole of the flow-through cover 1211 through the throttling grooves of the multi-groove valve plate 1212. As the oil continues to increase, the pressure in the chamber increases, and the throttling groove area is not enough to relieve the pressure in the chamber. At this time, the first valve plate 1213 will warp and deform, forming a circumferential gap with the outer ring band 1218 of the flow-through cover 1211. The circumferential gap area is much larger than the sum of the multi-groove areas. The pressure is relieved in this way and a certain damping force is generated. At the same time, the oil flows through the pilot valve assembly 121 and returns to the upper chamber 8 to prepare for the rebound stroke. By optimizing the pilot valve assembly 121 and the flow-through cover 1211 in this way, the number of valve plates is less, the flow-through cover 1211 is easier to process, the material cost and assembly time cost are reduced, the length of the valve system is reduced. When the shock absorber works and the lengths of the oil storage cylinder and the working cylinder are the same, the effective stroke is longer, which is more beneficial to the layout of the shock absorber on the vehicle. The oil return hole 1219 is optimized to make the ring band of the flow-through cover shrink and the outer diameter of the valve system become smaller, effectively preventing the valve plate from rubbing against the internal thread of the flow-through cover in extreme cases, resulting in poor product performance.

[0024] 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 pilot valve of a solenoid valve shock absorber, characterized in that, It includes a piston rod (1), an oil storage cylinder assembly (4) arranged at the right end of the piston rod (1), and a compression valve assembly (6) arranged at the right end of the oil storage cylinder assembly (4). The right end of the piston rod (1) extends into the interior of the oil storage cylinder assembly (4). An electromagnetic valve assembly (11) is arranged at the right end of the piston rod (1), and a pilot valve and circulation screw assembly (12) is arranged on the right side of the electromagnetic valve assembly (11). The pilot valve and circulation screw assembly (12) includes a pilot valve assembly (121) arranged on the right side of the electromagnetic valve assembly (11). A circulation screw (122) is arranged on the right side of the pilot valve assembly (121). The pilot valve assembly (121) includes a circulation screw cover (1211) arranged on the right side of the electromagnetic valve assembly (11). An inner ring band (1217) and an outer ring band (1218) are respectively arranged on the left side of the circulation screw cover (1211). A plurality of oil return holes (1219) are formed inside the circulation screw cover (1211). Both sides of the oil return holes (1219) penetrate through the left and right ends of the circulation screw cover (1211). A plurality of the oil return holes (1219) are all located between the inner ring band (1217) and the outer ring band (1218). A multi-groove valve plate (1212) is arranged on the right side of the inner ring band (1217) and the outer ring band (1218). A first valve plate (1213) is arranged on the right side of the multi-groove valve plate (1212). A second valve plate (1214) is arranged on the right side of the first valve plate (1213). A third valve plate (1215) is arranged on the right side of the second valve plate (1214). The diameter of the second valve plate (1214) is smaller than that of the first valve plate (1213) and the third valve plate (1215). A washer (1216) is arranged on the right side of the third valve plate (1215).

2. The pilot valve of a solenoid valve shock absorber according to claim 1, characterized in that: A restoration valve assembly (13) is arranged on the outer side of the circulation screw (122).

3. The pilot valve of a solenoid valve shock absorber according to claim 2, characterized in that: The circulation screw cover (1211) is specifically a metal machined part.

4. The pilot valve of a solenoid valve shock absorber according to claim 3, characterized in that: An oil seal (2) is arranged on the left side inside the oil storage cylinder assembly (4). A guide seat (3) is arranged on the right side of the oil seal (2). A working cylinder (5) is fixedly arranged inside the oil storage cylinder assembly (4). An outer cavity (9) is formed between the working cylinder (5) and the inner wall of the oil storage cylinder assembly (4).

5. The pilot valve of a solenoid valve shock absorber according to claim 4, characterized in that: The outer wall of the restoration valve assembly (13) is in contact with the inner wall of the working cylinder (5). A lower cavity (7) is formed inside the working cylinder (5) on the right side of the restoration valve assembly (13). An upper cavity (8) is formed inside the working cylinder (5) on the left side of the restoration valve assembly (13).

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