Circulation valve core of external electromagnetic valve shock absorber and shock absorber

Abstract

The invention belongs to the technical field of semi-active suspensions, and mainly relates to a circulation valve core of an external electromagnetic valve shock absorber and a shock absorber, the circulation valve core comprises a core body and an annular sealing groove, and the core body comprises a first sleeve, a second sleeve, a third sleeve, a fourth sleeve and a fifth sleeve; the top ends of the second sleeve and the fourth sleeve are flush and higher than the top end of the third sleeve; the bottom ends of the first sleeve and the second sleeve are flush, and the bottom end of the third sleeve is lower than the bottom end of the second sleeve, so that two connected through holes with different diameters are formed; the bottom end of the fifth sleeve is lower than the bottom end of the third sleeve, the bottom of the third sleeve and the bottom of the fifth sleeve are used for forming a connecting groove arranged on the electromagnetic valve in a sleeving mode, the shock absorber comprises a shock absorber assembly and an electromagnetic valve assembly, and the electromagnetic valve assembly comprises the circulation valve element. The oil flows to the expanded hole from the through hole, the flowing speed of the oil is reduced, the pressure is increased, and foam generated by flowing of the oil is eliminated through extrusion of the large pressure.

Description

Technical Field

[0001] The invention belongs to the technical field of semi-active suspension, and mainly relates to a flow valve core and a shock absorber of an external electromagnetic valve shock absorber. Background Art

[0002] The external solenoid valve shock absorber is a device that combines a solenoid valve with a shock absorber. The solenoid valve is installed on the outside of the shock absorber and is connected to the inside of the shock absorber through an oil pipe. As a cost-effective semi-active suspension technology, the connection and assembly of the solenoid valve and the shock absorber have become a crucial part that affects its performance, especially the connection between the solenoid valve and the intermediate cylinder; high-pressure oil flows between the solenoid valve and the intermediate cylinder, and the solenoid valve and the intermediate cylinder are directly connected to the end hole of the intermediate cylinder through the solenoid valve end cover, which is difficult to assemble and has high requirements for the assembly process; the pressure of the intermediate cylinder oil is directly transmitted to the solenoid valve mouth, and the pressure is unstable, resulting in large fluctuations in the performance curve; the solenoid valve end cover is directly assembled with a sealing ring, and the sealing ring is easily directly impacted during the oil impact process and falls off, causing leakage.

[0003] At present, a flow valve core is usually arranged between the solenoid valve and the intermediate cylinder to prevent the pressure of the oil in the intermediate cylinder from being directly transmitted to the mouth of the solenoid valve, thereby preventing the pressure of the oil in the intermediate cylinder from affecting the performance of the external solenoid valve. As provided in the Chinese invention patent document with the authorization announcement number CN218000253U, a shock absorber that is easy to assemble includes a shock absorber assembly and a solenoid valve assembly. The shock absorber assembly includes a working cylinder, an intermediate cylinder and an oil storage cylinder that are sequentially sleeved from the inside to the outside. The side wall of the oil storage cylinder is provided with a solenoid valve connection port, and the side wall of the intermediate cylinder is provided with an oil outlet coaxial with the solenoid valve connection port; the solenoid valve assembly includes a solenoid valve seat connected to the outside of the solenoid valve connection port, a solenoid valve sleeved in the solenoid valve seat, a circulation valve core provided between the solenoid valve and the oil storage cylinder, and a solenoid connected to the solenoid valve; the left end of the circulation valve core abuts against the side wall of the intermediate cylinder outside the oil outlet, an annular groove is provided between the circulation valve core and the side wall of the intermediate cylinder, a first sealing ring is provided in the annular groove, a connecting groove is provided at the right end of the circulation valve core, the connecting groove is sleeved on the solenoid valve, an annular groove is provided in the connecting groove, and a second sealing ring is provided in the annular groove; a guide portion for sleeved into the oil outlet is provided at the end of the circulation valve core away from the solenoid valve. The utility model avoids the middle cylinder being directly connected to the solenoid valve mouth, and avoids the pressure of the oil in the middle cylinder being directly transmitted to the solenoid valve mouth to affect the solenoid valve.

[0004] However, when the solenoid valve is operated improperly, air may be entrained in the oil, resulting in foam. The flow valve core mentioned above cannot eliminate the foam, thus affecting the performance of the hydraulic cylinder and the solenoid valve. Summary of the invention

[0005] The invention provides a flow valve core and a shock absorber of an external electromagnetic valve shock absorber, so as to solve the problem in the prior art that the flow valve core cannot eliminate bubbles, resulting in low performance of a hydraulic cylinder and an electromagnetic valve.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] A flow valve core of an external electromagnetic valve damper, comprising a first sleeve, a second sleeve, a third sleeve, a fourth sleeve and a fifth sleeve which are coaxial and integrally formed from the inside to the outside; the end of the first sleeve is used to extend into an intermediate cylinder and to be gap-matched with an oil outlet of the intermediate cylinder; the second sleeve is flush with the top of the fourth sleeve and is higher than the top of the third sleeve; the second sleeve, the third sleeve and the fourth sleeve form an annular sealing groove for placing a sealing ring to seal the flow valve core and the intermediate cylinder; the first sleeve and the third sleeve are used to seal the flow valve core and the intermediate cylinder. The bottom ends of the two sleeves are flush, the bottom end of the third sleeve is lower than the bottom end of the second sleeve, the inner side wall of the third sleeve and the bottom walls of the first sleeve and the second sleeve together form an expanded hole with a diameter larger than the inner hole diameter of the first sleeve, and the expanded hole is connected to and communicated with the inner hole of the first sleeve; the bottom end of the third sleeve is used to press on the solenoid valve; the bottom end of the fifth sleeve is lower than the bottom end of the third sleeve, and the inner side wall of the fifth sleeve and the bottom wall of the third sleeve form a connecting groove that is sleeved outside the solenoid valve and has an interference fit with the solenoid valve.

[0008] Beneficial effects: When the present invention is actually used, a sealing ring is inserted into the annular sealing groove and the end of the first sleeve is extended into the oil outlet of the middle cylinder, the top ends of the second sleeve and the fourth sleeve abut against the side wall of the middle cylinder, and the first sleeve is clearance-matched with the oil outlet; the bottom end of the third sleeve presses the solenoid valve and the connecting groove is arranged on the solenoid valve, and the connecting groove and the solenoid valve are interference-fitted.

[0009] The clearance between the first sleeve and the oil outlet of the present invention is matched to facilitate the assembly of the intermediate cylinder and the circulation valve core; the oil flows from the intermediate cylinder to the solenoid valve, and during the flow, the oil flows from the inner hole of the first sleeve to the expansion hole connected to the inner hole of the first sleeve. It can be seen from the Bernoulli equation (p+1 / 2ρv^2+ρgh=C) that if the oil flow rate is low, the pressure is high, and if the oil flow rate is high, the pressure is low; the oil flows from the inner hole of the first sleeve to the expansion hole with a diameter larger than the inner hole of the first sleeve, the oil flow rate decreases, and the pressure increases, so that the high pressure can squeeze and eliminate the foam generated by the oil flow, solving the serious foaming problem of the solenoid valve.

[0010] Furthermore, the expanded hole is a tapered hole, and the minimum hole diameter of the tapered hole is larger than the inner hole diameter of the first sleeve.

[0011] Beneficial effect: The diameter of the expanded hole gradually increases, and the pressure gradually increases during the process of oil flowing to the solenoid valve, which is more conducive to squeezing and eliminating foam.

[0012] Furthermore, the inner cylinder wall of the fifth sleeve is provided with a plurality of oil passage grooves extending along its axial direction and distributed in the circumferential direction of the fifth sleeve.

[0013] Beneficial effect: When the instantaneous oil pressure is very high, a gap will be opened at the connection between the solenoid valve and the bottom end of the third sleeve by the high-pressure oil, and part of the oil will slip away through the oil groove on the fifth sleeve, thereby avoiding the solenoid valve from being damaged by over-pressure; the connecting groove and the solenoid valve have an interference fit, and the setting of the oil groove facilitates reducing the concentration of stress caused by the interference fit between the connecting groove and the solenoid valve, preventing the stress concentration from damaging the circulation valve core and increasing the service life of the circulation valve core.

[0014] Furthermore, a circle of flange is integrally formed on the inner cylinder wall of the fifth sleeve, the bottom of the flange is flush with the bottom wall of the fifth sleeve, the top of the flange is lower than the bottom of the third sleeve, and the flange is provided with a flaring groove corresponding to and connected to the oil groove one by one, and the groove area of ​​the flaring groove is larger than the groove area of ​​the oil groove.

[0015] Beneficial effect: the setting of the expanded groove increases the groove opening of the oil groove, thereby preventing the groove opening of the oil groove from being blocked by impurities in the oil.

[0016] Furthermore, the annular sealing groove is a dovetail groove structure.

[0017] Beneficial effect: The dovetail groove structure can further prevent the sealing ring from falling off.

[0018] In order to solve the above problems, the technical solution of a shock absorber provided by the present invention is as follows:

[0019] A shock absorber, comprising a shock absorber assembly and a solenoid valve assembly, wherein the shock absorber assembly comprises a working cylinder, an intermediate cylinder and an oil storage cylinder which are sequentially sleeved from the inside to the outside, a solenoid valve connection port is arranged on the side wall of the oil storage cylinder, and an oil outlet which is coaxial with the solenoid valve connection port is arranged on the side wall of the intermediate cylinder; the solenoid valve assembly comprises a solenoid valve seat connected to the outside of the solenoid valve connection port, a solenoid valve sleeved in the solenoid valve seat, a flow valve core of an external solenoid valve shock absorber arranged between the solenoid valve and the oil storage cylinder, and a solenoid connected to the solenoid valve; the flow valve core of the external solenoid valve shock absorber comprises a first sleeve, a second sleeve, a third sleeve, a fourth sleeve and a fifth sleeve which are coaxial and integrally formed from the inside to the outside; the end of the first sleeve is used to extend into the intermediate cylinder and to be spaced with the oil outlet of the intermediate cylinder The second sleeve is flush with the top end of the fourth sleeve and is higher than the top end of the third sleeve. The second sleeve, the third sleeve and the fourth sleeve form an annular sealing groove for placing a sealing ring to seal the circulation valve core and the intermediate cylinder; the bottom ends of the first sleeve and the second sleeve are flush, the bottom end of the third sleeve is lower than the bottom end of the second sleeve, the inner side wall of the third sleeve and the bottom walls of the first sleeve and the second sleeve together form an expanded hole with a diameter larger than the inner hole diameter of the first sleeve, and the expanded hole is connected to and communicated with the inner hole of the first sleeve; the bottom end of the third sleeve is used to press on the solenoid valve; the bottom end of the fifth sleeve is lower than the bottom end of the third sleeve, and the inner side wall of the fifth sleeve and the bottom wall of the third sleeve form a connecting groove that is sleeved outside the solenoid valve and has an interference fit with the solenoid valve.

[0020] Beneficial effects: When the present invention is actually used, a sealing ring is inserted into the annular sealing groove and the end of the first sleeve is extended into the oil outlet of the middle cylinder, the top ends of the second sleeve and the fourth sleeve abut against the side wall of the middle cylinder, and the first sleeve is clearance-matched with the oil outlet; the bottom end of the third sleeve presses the solenoid valve and the connecting groove is arranged on the solenoid valve, and the connecting groove and the solenoid valve are interference-fitted.

[0021] The clearance between the first sleeve and the oil outlet of the present invention is matched to facilitate the assembly of the intermediate cylinder and the circulation valve core; the oil flows from the intermediate cylinder to the solenoid valve, and during the flow, the oil flows from the inner hole of the first sleeve to the expansion hole connected to the inner hole of the first sleeve. It can be seen from the Bernoulli equation (p+1 / 2ρv^2+ρgh=C) that if the oil flow rate is low, the pressure is high, and if the oil flow rate is high, the pressure is low; the oil flows from the inner hole of the first sleeve to the expansion hole with a diameter larger than the inner hole of the first sleeve, the oil flow rate decreases, and the pressure increases, so that the high pressure can squeeze and eliminate the foam generated by the oil flow, solving the serious foaming problem of the solenoid valve.

[0022] Furthermore, the expanded hole is a tapered hole, and the minimum hole diameter of the tapered hole is larger than the inner hole diameter of the first sleeve.

[0023] Beneficial effect: The diameter of the expanded hole gradually increases, and the pressure gradually increases during the process of oil flowing to the solenoid valve, which is more conducive to squeezing and eliminating foam.

[0024] Furthermore, the inner cylinder wall of the fifth sleeve is provided with a plurality of oil passage grooves extending along its axial direction and distributed in the circumferential direction of the fifth sleeve.

[0025] Beneficial effect: When the instantaneous oil pressure is very high, a gap will be opened at the connection between the solenoid valve and the bottom end of the third sleeve by the high-pressure oil, and part of the oil will slip away through the oil groove on the fifth sleeve, thereby avoiding the solenoid valve from being damaged by over-pressure; the connecting groove and the solenoid valve have an interference fit, and the setting of the oil groove facilitates reducing the concentration of stress caused by the interference fit between the connecting groove and the solenoid valve, preventing the stress concentration from damaging the circulation valve core and increasing the service life of the circulation valve core.

[0026] Furthermore, a circle of flange is integrally formed on the inner cylinder wall of the fifth sleeve, the bottom of the flange is flush with the bottom wall of the fifth sleeve, the top of the flange is lower than the bottom of the third sleeve, and the flange is provided with a flaring groove corresponding to and connected to the oil groove one by one, and the groove area of ​​the flaring groove is larger than the groove area of ​​the oil groove.

[0027] Beneficial effect: the setting of the expanded groove increases the groove opening of the oil groove, thereby preventing the groove opening of the oil groove from being blocked by impurities in the oil.

[0028] Furthermore, the annular sealing groove is a dovetail groove structure.

[0029] Beneficial effect: The dovetail groove structure can further prevent the sealing ring from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0031] Figure 1 is a schematic diagram of a three-dimensional structure of the present invention from a first viewing angle;

[0032] Figure 2 is a schematic diagram of a three-dimensional structure of the present invention from a second viewing angle;

[0033] Figure 3 A bottom view of the present invention;

[0034] Figure 4 for Figure 3 AA section view in;

[0035] Figure 5 It is a schematic diagram of the assembly of the circulation valve core, the intermediate cylinder and the solenoid valve.

[0036] Description of reference numerals:

[0037] 1. First sleeve; 2. Second sleeve; 3. Third sleeve; 4. Fourth sleeve; 5. Fifth sleeve; 6. Expanding groove; 7. Expanding hole; 8. Through hole; 9. Flange; 10. Annular sealing groove; 11. Oil through groove; 12. Oil outlet; 13. Intermediate cylinder; 14. Sealing ring; 15. Solenoid valve; 16. Connecting groove. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] Various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0040] An embodiment of a flow valve core of an external solenoid valve damper provided by the present invention:

[0041] like Figure 1 , Figure 3 and Figure 4 As shown, the flow valve core of the external solenoid valve damper includes a first sleeve 1, a second sleeve 2, a third sleeve 3, a fourth sleeve 4 and a fifth sleeve 5 which are coaxial from inside to outside and integrally formed.

[0042] like Figure 1 , Figure 4 and Figure 5 As shown, the top of the first sleeve 1 is higher than the top of the second sleeve 2, and the top of the first sleeve 1 extends into the middle cylinder 13 and is in clearance with the oil outlet 12 of the middle cylinder 13, so as to facilitate the assembly of the middle cylinder and the circulation valve core. The top of the second sleeve 2 is flush with the top of the fourth sleeve 4 and is higher than the top of the third sleeve 3. The second sleeve 2, the third sleeve 3 and the fourth sleeve 4 together form the above-mentioned annular sealing groove 10, which is used to place the sealing ring 14 to seal the circulation valve core and the working cylinder. The tops of the second sleeve 2 and the fourth sleeve 4 abut against the side wall of the middle cylinder 13; the dovetail groove structure adopted in the annular sealing groove 10 further prevents the sealing groove from falling off. The top of the fifth sleeve 5 is lower than the top of the fourth sleeve 4, saving materials and space and reducing costs.

[0043] like Figure 1 , Figure 4 and Figure 5 As shown, the bottom ends of the first sleeve 1 and the second sleeve 2 are flush, and the bottom end of the third sleeve 3 is lower than the bottom end of the second sleeve 2, forming two through holes of different diameters and connected, wherein the inner hole of the first sleeve 1 is a through hole 8, and the upper and lower hole edges of the through hole 8 are chamfered, and the inner side wall of the third sleeve 3 and the bottom of the first sleeve 1 and the second sleeve 2 together form an expanded hole 7, and the expanded hole 7 is a tapered hole, and the minimum diameter of the expanded hole 7 is greater than the diameter of the through hole 8. The oil flows from the middle cylinder 13 to the solenoid valve 15, and the flow During the process, the oil flows from the through hole 8 to the expanded hole 7, and the aperture becomes larger. Through the Bernoulli equation (p+1 / 2ρv^2+ρgh=C), it can be known that if the oil flow rate is low, the pressure is high, and if the oil flow rate is high, the pressure is low; the oil flows from the through hole 8 to the expanded hole 7, the aperture becomes larger, the oil flow rate decreases, and the pressure becomes high, so that the high pressure can squeeze and eliminate the foam generated by the oil flow, solving the problem of serious foaming of the solenoid valve 15; the bottom end of the third sleeve 3 is pressed on the solenoid valve 15.

[0044] like Figure 1 , Figure 4 and Figure 5 As shown, the bottom end of the fifth sleeve 5 is lower than the bottom end of the third sleeve 3 , and the bottom wall of the third sleeve 3 and the inner side wall of the fifth sleeve 5 form a connecting groove 16 sleeved on the solenoid valve 15 , and the connecting groove 16 and the solenoid valve 15 are interference fit.

[0045] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the inner wall of the fifth sleeve 5 is provided with six oil-passing grooves 11 arranged at equal intervals in the circumferential direction thereof, and each oil-passing groove 11 extends along the axial direction of the fifth sleeve 5. When the instantaneous pressure of the oil is very high, a gap will be opened by the high-pressure oil at the connection between the solenoid valve 15 and the bottom end of the third sleeve 3, and part of the oil will slip through the oil-passing grooves 11 on the fifth sleeve 5, thereby preventing the solenoid valve 15 from being damaged by overpressure; the connection groove 16 and the solenoid valve 15 are interference-fitted, and the provision of the oil-passing grooves 11 facilitates reducing the concentration of stress generated by the interference fit between the connection groove 16 and the solenoid valve 15, preventing the stress concentration from damaging the circulation valve core, and increasing the service life of the circulation valve core.

[0046] A circle of flange 9 is integrally formed on the inner cylinder wall of the fifth sleeve 5, the bottom of the flange 9 is flush with the bottom wall of the fifth sleeve 5, the top of the flange 9 is lower than the bottom of the third sleeve 3, and a flared groove 6 corresponding to and communicating with the oil groove 11 is opened on the flange 9, the groove area of ​​the flared groove 6 is larger than the groove area of ​​the oil groove 11, the setting of the flared groove 6 increases the groove of the oil groove 11, and avoids the clogging of the groove of the oil groove 11 caused by impurities in the oil.

[0047] The working process of the present invention is as follows:

[0048] When the present invention is actually used, the sealing ring 14 is inserted into the annular sealing groove 10 and the end of the first sleeve 1 is extended into the oil outlet 12 of the intermediate cylinder 13, the top ends of the second sleeve 2 and the fourth sleeve 4 abut against the side wall of the intermediate cylinder 13, and the first sleeve 1 is clearance-fitted with the oil outlet 12; the bottom end of the third sleeve 3 presses the solenoid valve 15 and the connecting groove 16 is sleeved on the solenoid valve 15, and the connecting groove 16 and the solenoid valve 15 are interference-fitted.

[0049] The first sleeve 1 of the present invention is clearance-matched with the oil outlet 12 to facilitate the assembly of the intermediate cylinder 13 and the circulation valve core; the oil flows from the intermediate cylinder 13 to the solenoid valve 15, and during the flow, the oil flows from the inner hole of the first sleeve 1 to the expansion hole 7 connected to the inner hole of the first sleeve 1. It can be seen from the Bernoulli equation (p+1 / 2ρv^2+ρgh=C) that if the oil flow rate is low, the pressure is high, and if the oil flow rate is high, the pressure is low; the oil flows from the inner hole of the first sleeve 1 to the expansion hole 7 with a diameter larger than the inner hole of the first sleeve 1, the oil flow rate decreases, and the pressure increases, so that the high pressure can squeeze and eliminate the foam generated by the oil flow, thereby solving the serious foaming problem of the solenoid valve.

[0050] When the instantaneous oil pressure is very high, the connection between the solenoid valve 15 and the bottom end of the third sleeve 3 will be flushed open by the high-pressure oil to form a gap, and part of the oil will slip away through the oil groove 11 on the fifth sleeve 5, thereby preventing the solenoid valve 15 from being damaged by over-pressure; the connecting groove 16 and the solenoid valve 15 have an interference fit, and the setting of the oil groove 11 facilitates reducing the concentration of stress caused by the interference fit between the connecting groove 16 and the solenoid valve 15, preventing the stress concentration from damaging the circulation valve core, and increasing the service life of the circulation valve core.

[0051] Embodiment 2 of a flow valve core of an external solenoid valve damper provided by the present invention:

[0052] The main difference between this embodiment and the first embodiment is that in the first embodiment, the top of the fifth sleeve is lower than the top of the fourth sleeve. In this embodiment, the top of the fifth sleeve may also be flush with the top of the fourth sleeve.

[0053] An embodiment of a vibration damper provided by the present invention:

[0054] The shock absorber includes a shock absorber assembly and a solenoid valve assembly. The shock absorber assembly includes a working cylinder, an intermediate cylinder 13 and an oil storage cylinder which are sequentially arranged from the inside to the outside. The oil storage cylinder is provided with a solenoid valve 15 connection port on the side wall, and the intermediate cylinder 15 is provided with an oil outlet 12 coaxial with the solenoid valve 15 connection port on the side wall; the solenoid valve assembly includes a solenoid valve seat connected to the outside of the solenoid valve 15 connection port, a solenoid valve 15 arranged in the solenoid valve seat, a flow valve core of an external solenoid valve shock absorber arranged between the solenoid valve 15 and the oil storage cylinder, and a solenoid connected to the solenoid valve; the structure of the flow valve core of the external solenoid valve shock absorber is the same as the structure of the above-mentioned flow valve core embodiments, which will not be described in detail here.

Claims

1. A flow valve core of an external solenoid valve damper, characterized in that: It includes a first sleeve, a second sleeve, a third sleeve, a fourth sleeve and a fifth sleeve which are coaxial from inside to outside and integrally formed; The end of the first sleeve is used to extend into the middle cylinder and to be in clearance with the oil outlet of the middle cylinder; The second sleeve is flush with the top of the fourth sleeve and is higher than the top of the third sleeve. The second sleeve, the third sleeve and the fourth sleeve form an annular sealing groove for placing a sealing ring to seal the flow valve core and the intermediate cylinder. The bottom ends of the first sleeve and the second sleeve are flush, the bottom end of the third sleeve is lower than the bottom end of the second sleeve, the inner side wall of the third sleeve and the bottom walls of the first sleeve and the second sleeve together form an expanded hole with a diameter larger than the inner hole diameter of the first sleeve, and the expanded hole is connected to and communicated with the inner hole of the first sleeve; the bottom end of the third sleeve is used to press on the solenoid valve; The bottom end of the fifth sleeve is lower than the bottom end of the third sleeve, and the inner side wall of the fifth sleeve and the bottom wall of the third sleeve form a connecting groove which is sleeved outside the solenoid valve and has an interference fit with the solenoid valve.

2. The flow valve core of the external solenoid valve damper according to claim 1, characterized in that: The expanded hole is a tapered hole, and the minimum hole diameter of the tapered hole is larger than the inner hole diameter of the first sleeve.

3. The flow valve core of the external solenoid valve damper according to claim 2, characterized in that: The inner cylinder wall of the fifth sleeve is provided with a plurality of oil passage grooves extending along the axial direction thereof and distributed in the circumferential direction of the fifth sleeve.

4. The flow valve core of the external solenoid valve damper according to claim 3, characterized in that: A circle of flange is integrally formed on the inner cylinder wall of the fifth sleeve, the bottom of the flange is flush with the bottom wall of the fifth sleeve, the top of the flange is lower than the bottom of the third sleeve, and the flange is provided with a flared groove corresponding to and connected to the oil groove one by one, and the groove area of ​​the flared groove is larger than the groove area of ​​the oil groove.

5. The flow valve core of the external electromagnetic valve shock absorber according to any one of claims 1 to 4, characterized in that: The annular sealing groove is a dovetail groove structure.

6. A shock absorber, comprising a shock absorber assembly and a solenoid valve assembly, wherein the shock absorber assembly comprises a working cylinder, an intermediate cylinder and an oil storage cylinder which are sequentially sleeved from the inside to the outside, the oil storage cylinder side wall is provided with a solenoid valve connection port, and the intermediate cylinder side wall is provided with an oil outlet coaxial with the solenoid valve connection port; the solenoid valve assembly comprises a solenoid valve seat connected to the outside of the solenoid valve connection port, a solenoid valve sleeved in the solenoid valve seat, a flow valve core of an external solenoid valve shock absorber arranged between the solenoid valve and the oil storage cylinder, and a solenoid connected to the solenoid valve; the flow valve core of the external solenoid valve shock absorber comprises a first sleeve, a second sleeve, a third sleeve, a fourth sleeve and a fifth sleeve which are coaxial and integrally formed from the inside to the outside; the end of the first sleeve is used to extend into the intermediate cylinder and to have a gap with the oil outlet of the intermediate cylinder Match; the top ends of the second sleeve and the fourth sleeve are flush and higher than the top end of the third sleeve, and the second sleeve, the third sleeve and the fourth sleeve form an annular sealing groove for placing a sealing ring to seal the circulation valve core and the intermediate cylinder; the bottom ends of the first sleeve and the second sleeve are flush, and the bottom end of the third sleeve is lower than the bottom end of the second sleeve, and the inner side wall of the third sleeve and the bottom walls of the first sleeve and the second sleeve together form an expanded hole with a diameter larger than the inner hole diameter of the first sleeve, and the expanded hole is connected to and communicated with the inner hole of the first sleeve; the bottom end of the third sleeve is used to press on the solenoid valve; the bottom end of the fifth sleeve is lower than the bottom end of the third sleeve, and the inner side wall of the fifth sleeve and the bottom wall of the third sleeve form a connecting groove that is sleeved outside the solenoid valve and has an interference fit with the solenoid valve.

7. A shock absorber according to claim 6, characterized in that: The expanded hole is a tapered hole, and the minimum hole diameter of the tapered hole is larger than the inner hole diameter of the first sleeve.

8. A vibration absorber according to claim 6, characterized in that: The inner cylinder wall of the fifth sleeve is provided with a plurality of oil passage grooves extending along the axial direction thereof and distributed in the circumferential direction of the fifth sleeve.

9. A vibration absorber according to claim 6, characterized in that: A circle of flange is integrally formed on the inner cylinder wall of the fifth sleeve, the bottom of the flange is flush with the bottom wall of the fifth sleeve, the top of the flange is lower than the bottom of the third sleeve, and the flange is provided with a flared groove corresponding to and connected to the oil groove one by one, and the groove area of ​​the flared groove is larger than the groove area of ​​the oil groove.

10. A vibration absorber according to any one of claims 6 to 9, characterized in that: The annular sealing groove is a dovetail groove structure.

Images