Sealing structure of electromagnetic device for shock absorber

Abstract

The utility model discloses a sealing structure of an electromagnetic device for a shock absorber, which relates to the technical field of electromagnetic valves and comprises a magnetic shell, a placing groove is arranged on the left side of a magnetic gasket, a sealing gasket is placed in the placing groove of the magnetic gasket, and a push rod is slidably sleeved with the sealing gasket. One end of the spring is in contact with the outer wall of the armature, the other end of the spring is in contact with the outer wall of the sealing gasket, and an annular groove is formed in the inner wall of the sealing gasket. The plurality of annular grooves are used for throttling oil flowing between the push rod and the sealing washer; due to the fact that the sealing effect is mainly achieved through throttling of the multiple annular grooves, a large gap can be designed between the push rod and the sealing washer, the effect of reducing relative friction force can be achieved while sealing is guaranteed, and the design is not high in requirement for fit clearance tolerance and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a sealing structure of an electromagnetic device for a shock absorber. Background Art

[0002] A controllable damping solenoid valve is a valve device that can achieve fluid damping control. The electromagnetic device inside it applies different magnitudes of electromagnetic force according to the magnitude of the electromagnetic force, and then determines the magnitude of the damping through the magnitude of the electromagnetic force; in this process, to achieve a tight connection between the push rod and its controlled unit, it is necessary to ensure that the electromagnetic part inside the magnetic sleeve element is filled with high-pressure oil. To avoid leakage of high-pressure oil, a high sealing effect usually needs to be achieved.

[0003] For example, the pressure regulator of an actuator is disclosed in the patent document with the publication number CN102803782B. In the specification part of this patent, a thin-walled sealing gasket 18 is used in the electromagnetic part to seal the high-pressure oil in the electromagnetic part to play a role in isolating leakage;

[0004] In fact, to ensure both the sealing and movement effects at the same time, the fitting clearance between the push rod and the sealing gasket is generally designed to be small, and the sealing gasket itself is prone to eccentricity on the surface of the push rod. This causes the push rod to often be subject to the frictional force of the sealing gasket during movement, and thus it is impossible to accurately provide sufficient electromagnetic force to the force-receiving unit of the push rod. Moreover, the small fitting clearance requires high machining accuracy and high cost. To improve such a phenomenon, the utility model proposes a sealing structure of an electromagnetic device for a shock absorber. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies existing in the prior art, and to propose a sealing structure of an electromagnetic device for a shock absorber.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A sealing structure of an electromagnetic device for a shock absorber, including a magnetic housing, a magnetic sleeve is fixedly sleeved inside the magnetic housing, a magnetic gasket is fixedly sleeved at one end of the magnetic sleeve, a push rod is slidably sleeved inside the magnetic gasket, an armature is slidably sleeved inside the other end of the magnetic sleeve, a sleeve hole is opened in the middle of the armature, the other end of the push rod extends into the sleeve hole, a spring is sleeved on the outer wall of the push rod, the spring is located between the armature and the magnetic gasket, a placement groove is opened on the left side of the magnetic gasket, a sealing gasket is placed in the placement groove of the magnetic gasket, the push rod is slidably sleeved with the sealing gasket, one end of the spring contacts the outer wall of the armature, the other end of the spring contacts the outer wall of the sealing gasket, and an annular groove is opened on the inner wall of the sealing gasket.

[0008] Preferably, the size of the placement groove matches that of the annular groove, the placement groove and the annular groove are sleeved with each other, and the left side of the sealing washer is in contact with the inner wall of the magnetic washer.

[0009] Preferably, there are multiple annular grooves, and the multiple annular grooves are arranged equidistantly along the axial direction of the sealing washer.

[0010] Preferably, one end of the spring close to the sealing washer extends into the placement groove.

[0011] Preferably, the magnetic housing and the magnetic sleeve are fixedly sleeved by an interference fit method, and the magnetic washer and the magnetic sleeve are fixedly sleeved by an interference fit method.

[0012] Preferably, oil discharge holes are formed in the outer wall of the armature, and there is at least one oil discharge hole. An electromagnetic coil is sleeved on the inner wall of the magnetic housing, and the electromagnetic coil is located between the magnetic housing and the magnetic sleeve.

[0013] The beneficial effects of the present utility model are as follows:

[0014] In the present utility model, through the design of the sealing washer and the annular groove, multiple annular grooves are arranged inside the sealing washer, and the multiple annular grooves are used to throttle the oil flowing between the push rod and the sealing washer; since its sealing effect is mainly achieved by the throttling of multiple annular grooves, a relatively large gap can be designed between the push rod and the sealing washer, which can achieve the effect of reducing the relative friction while ensuring the sealing, and this design has low requirements for the tolerance of the mating gap and low cost. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0016] Figure 2 It is a right view of a sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0017] Figure 3 It is a Figure 2 cross-sectional view taken along -A of a sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0018] Figure 4 It is a schematic structural diagram of a magnetic washer of a sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0019] Figure 5 It is a cross-sectional view of a magnetic washer of a sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0020] Figure 6Schematic diagram of the sealing washer of the sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0021] Figure 7 Cross-sectional view of the sealing washer of the sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0022] Figure 8 Schematic diagram of the armature of the sealing structure of an electromagnetic device for a shock absorber of the present utility model.

[0023] Reference numerals in the figure: 1, magnetic housing; 2, magnetic washer; 201, placement groove; 3, push rod; 4, spring; 5, magnetic sleeve; 6, armature; 601, sleeve hole; 602, oil drain hole; 7, sealing washer; 701, annular groove; 8, electromagnetic coil. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0025] As shown in the attached Figure 1 to the attached Figure 8 figures:

[0026] A sealing structure of an electromagnetic device for a shock absorber includes a magnetic housing 1. A magnetic sleeve 5 is fixedly sleeved inside the magnetic housing 1. One end of the magnetic sleeve 5 is fixedly sleeved with a magnetic washer 2. A push rod 3 is slidably sleeved inside the magnetic washer 2. The other end of the magnetic sleeve 5 has an armature 6 slidably sleeved inside. A sleeve hole 601 is opened in the middle of the armature 6. The other end of the push rod 3 extends into the sleeve hole 601. A spring 4 is sleeved on the outer wall of the push rod 3. The spring 4 is located between the armature 6 and the magnetic washer 2. A placement groove 201 is opened on the left side of the magnetic washer 2. A sealing washer 7 is placed in the placement groove 201 of the magnetic washer 2. The push rod 3 is slidably sleeved with the sealing washer 7. One end of the spring 4 contacts the outer wall of the armature 6, and the other end of the spring 4 contacts the outer wall of the sealing washer 7. An annular groove 701 is opened on the inner wall of the sealing washer 7. The annular groove 701 in the sealing washer 7 is used for throttling and pressure equalization.

[0027] As shown in the attached Figure 3 to the attached Figure 7 figures, the size of the placement groove 201 matches the size of the annular groove 701. The placement groove 201 and the annular groove 701 are sleeved with each other. The left side of the sealing washer 7 contacts the inner wall of the magnetic washer 2. There are multiple annular grooves 701, and the multiple annular grooves 701 are arranged at equal intervals along the axis direction of the sealing washer 7.

[0028] In the above technical solution, a plurality of annular grooves 701 arranged at equal intervals are disposed inside the sealing washer 7. When the fluid passes through the gap between the push rod 3 and the sealing washer 7, part of the fluid flows through the inside of the annular groove 701, and the fluid forms a vortex inside the annular groove 701. The friction between the vortex and the fluid in the gap reduces the flow efficiency, thereby achieving the effect of reducing the flow rate. By this method, a large sealing effect can be achieved when the gap between the push rod 3 and the sealing washer 7 is large;

[0029] Moreover, when the fluid moves in the sealing washer 7, it will pass through the annular groove 701, forming a uniform pressure on the inner wall surface of the annular groove 701 on the sealing washer 7. Under the action of this equal pressure, the relative movement eccentricity between the sealing piece and the push rod can be avoided, and the relative friction force during movement can be reduced.

[0030] As shown in the attached Figure 3 figure, one end of the spring 4 close to the sealing washer 7 extends into the placement groove 201 for limiting and protecting the spring 4.

[0031] As shown in the attached Figure 3 figure, the magnetic housing 1 and the magnetic sleeve 5 are fixedly sleeved by an interference fit method, and the magnetic washer 2 and the magnetic sleeve 5 are fixedly sleeved by an interference fit method.

[0032] As shown in the attached Figure 1 to the attached Figure 8 figure, an oil drain hole 602 is formed on the outer wall of the armature 6. The oil drain hole 602 is at least one, and the oil drain hole 602 is used to ensure the oil fluid circulation. An electromagnetic coil 8 is sleeved on the inner wall of the magnetic housing 1, and the electromagnetic coil 8 is located between the magnetic housing 1 and the magnetic sleeve 5.

[0033] In the above technical solution, an electromagnetic cavity is formed between the magnetic housing 1 and the magnetic sleeve 5, and the electromagnetic cavity is used to install the electromagnetic coil 8. The push rod 3 and the armature 6 form an armature assembly. When the electromagnetic part of the electromagnetic device is energized with the expected current, the armature assembly is attracted by the electromagnetic force, and the armature assembly moves inside the cavity of the magnetic sleeve 5 to transmit the electromagnetic force outside the electromagnetic part.

[0034] The specific usage method and function of this embodiment:

[0035] The working principle of the present utility model is the same as that of CN102803782B, and will not be elaborated here;

[0036] In the present utility model, a plurality of annular grooves 701 arranged at equal intervals are disposed inside the sealing washer 7. When fluid passes through the gap between the push rod 3 and the sealing washer 7, part of the fluid flows through the inside of the annular grooves 701, and vortices are formed by the fluid inside the annular grooves 701. The flow efficiency is reduced through the friction between the vortices and the fluid in the gap, thereby achieving the effect of reducing the flow rate. Through this method, a large sealing effect can be achieved when the gap between the push rod 3 and the sealing washer 7 is relatively large;

[0037] Moreover, when the fluid moves in the sealing washer 7, it will pass through the annular grooves 701, forming a uniform pressure on the inner wall surface of the annular grooves 701 on the sealing washer 7. Under the action of this equal pressure, the relative movement eccentricity between the sealing piece and the push rod can be avoided, and the relative friction during movement can be reduced.

[0038] Please refer to the above structure and process Figures 1-7 .

[0039] In the present utility model, through the design of the sealing washer 7 and the annular grooves 701, a plurality of annular grooves 701 are disposed inside the sealing washer 7, and the plurality of annular grooves 701 are used for throttling the oil flowing through the gap between the push rod 3 and the sealing washer 7; since its sealing effect is mainly achieved by the throttling of the plurality of annular grooves 701, a relatively large gap can be designed between the push rod 3 and the sealing washer 7, and the effect of reducing the relative friction can be achieved while ensuring the sealing. Moreover, this design has low requirements for the tolerance of the mating gap and low cost.

[0040] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A sealing structure of an electromagnetic device for a shock absorber, comprising a magnetic shell (1), a magnetic sleeve (5) fixedly sleeved inside the magnetic shell (1), a magnetic washer (2) fixedly sleeved on one end of the magnetic sleeve (5), a push rod (3) slidably sleeved inside the magnetic washer (2), an armature (6) slidably sleeved on the other end of the magnetic sleeve (5), a sleeve hole (601) opened in the middle of the armature (6), the other end of the push rod (3) extends into the sleeve hole (601), a spring (4) sleeved on the outer wall of the push rod (3), the spring (4) is located between the armature (6) and the magnetic washer (2), characterized in that: The left side of the magnetic gasket (2) is provided with a placement groove (201), the magnetic gasket (2) is located in the placement groove (201) and a sealing gasket (7) is placed therein, the push rod (3) is slidably sleeved with the sealing gasket (7), one end of the spring (4) contacts the outer wall of the armature (6), the other end of the spring (4) contacts the outer wall of the sealing gasket (7), and the inner wall of the sealing gasket (7) is provided with an annular groove (701).

2. The sealing structure of the electromagnetic device for a vibration absorber according to claim 1, characterized in that: The placement groove (201) matches the size of the annular groove (701), the placement groove (201) and the annular groove (701) are sleeved with each other, and the left side of the sealing gasket (7) contacts the inner wall of the magnetic gasket (2).

3. The sealing structure of the electromagnetic device for a vibration absorber according to claim 2, characterized in that: There are a plurality of annular grooves (701), and the plurality of annular grooves (701) are arranged at equal distances along the axial direction of the sealing gasket (7).

4. The sealing structure of the electromagnetic device for a vibration absorber according to claim 2, characterized in that: One end of the spring (4) close to the sealing gasket (7) extends into the placement groove (201).

5. The sealing structure of the electromagnetic device for a vibration absorber according to claim 1, characterized in that: The magnetic shell (1) and the magnetic sleeve (5) are fixedly sleeved by means of an interference fit, and the magnetic gasket (2) and the magnetic sleeve (5) are fixedly sleeved by means of an interference fit.

6. The sealing structure of the electromagnetic device for a vibration absorber according to claim 1, characterized in that: The outer wall of the armature (6) is provided with an oil drain hole (602), and there is at least one oil drain hole (602). The inner wall of the magnetic shell (1) is sleeved with an electromagnetic coil (8), and the electromagnetic coil (8) is located between the magnetic shell (1) and the magnetic sleeve (5).

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