KR101001669B1 - Solenoid valve for a shock absorber - Google Patents

Abstract

The present invention relates to a solenoid valve of a shock absorber, wherein a separator tube (1) is inserted between an outer tube (4) and an inner tube (2) so that an inner high pressure passage (2a) and an inner low pressure passage (4a) are provided. In the solenoid valve 10 in which the one side of the housing 14 is directly coupled to the shock absorber is formed, and communicates with the high-pressure flow path 2a through the hollow hole formed by the retainer guide 12, the housing 14 The outer tube 4 is characterized in that the low pressure holes 14b and 4b are formed on the side walls, respectively, and include a solenoid cap 7 which is hermetically enclosed so as to communicate the low pressure holes 14b and 4b. Accordingly, the solenoid valve of the shock absorber according to the present invention forms a passage for communicating with the solenoid valve separately for the high pressure passage and the low pressure passage, thereby securing a wider communication path, thereby stably generating the damping force. In the case where the retainer guide and the housing are finely overlapped and the housing is strongly coupled by the nut, the structure is deformed by bending, and the flow path formed by the finely spaced overlap is also deformed so that the damping force is changed. It is fundamentally blocked by the housing structure to obtain structural stability, and the solenoid valve is installed to protrude from the shock absorber, so that the effective space can be secured through a simple structure.

Description

Solenoid valve of shock absorber {SOLENOID VALVE FOR A SHOCK ABSORBER}

1 is a cross-sectional view of a solenoid valve of a conventional shock absorber,

2 is a cross-sectional view showing a solenoid valve of a shock absorber according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1: Separator Tube 2: Inner Tube

2a: high pressure flow path 4: outer tube

4a: low pressure flow path 10: solenoid valve

12: retainer guide 14: housing

16: adjusting screw 18: plug

19, 29: elastic spring 20: fastening nut

22: Spool Load 24: Spool

26: operating rod 32: upper retainer

34: main valve 36: lower retainer

The present invention relates to a solenoid valve of a shock absorber, and more particularly, a stable damping force by changing the overlapping structure of the shock absorber and the solenoid valve into a single housing structure and separately forming a communication passage between the high pressure passage or the low pressure passage and the solenoid valve. The present invention relates to a solenoid valve of a shock absorber capable of improving durability and durability and obtaining a compact shape.

As the vehicle is popularized, the knowledge and demand level of the customer's vehicle is gradually increasing, and the functional performance such as output, quietness, ride comfort, and steering stability as well as the use, convenience, and economy of the vehicle have a great influence on purchasing the car. Crazy

Since the vehicle constantly receives vibrations or shocks from the road surface while driving, a shock absorber is installed between the vehicle body (or frame) and the axle to prevent the shock or vibrations from being transmitted directly to the vehicle body, thereby improving ride comfort, and also to prevent irregular vibration of the vehicle body. By suppressing, the driving stability is improved, and suspension is collectively referred to as a connecting device between the body and the axle including such a shock absorber, which controls the free vibration of the chassis spring and the chassis spring to alleviate the shock, thereby improving the riding comfort. It consists of an absorber (or shock absorber), a rolling stabilizer, a rubber bushing and a control arm.

In particular, the shock absorber serves to suppress and attenuate vibrations from the road surface and is mounted between the vehicle body or the frame and the wheels, and in particular, by absorbing the up and down vibration energy of the vehicle body to suppress the vibration and improve the riding comfort, It protects the cargo and reduces the dynamic stress of each part of the body to increase the endurance life. At the same time, it prevents the movement of the unsprung mass to secure the tire's foldability and prevent the change of posture by the inertia force. Inhibition improves the motor performance.

In this way, the shock absorber is required to improve the function of the suspension itself as it plays the biggest role in vibration attenuation, and the mounting of solenoid valve to generate the damping force variably as a means for improving the damping force is common. have.

The solenoid valve controls the flow of fluid by restricting the movement of the fluid through the installation of a valve installed in the middle of the flow path and the flow path, or a spool for selectively communicating the flow path. It is operated to attenuate.

Next, the structure and operation of the solenoid valve of the conventional shock absorber will be described with reference to the drawings.

1 is a cross-sectional view of a solenoid valve of a conventional shock absorber.

As shown, the solenoid valve of the conventional shock absorber is disposed in the retainer guide 12 and downstream of the retainer guide 12 in communication with the high pressure flow passage 2a formed between the inner tube 2 and the separator tube 1. And an spool rod 22 for guiding the spool 24 and the spool 24 which are slid and elastically moved hydraulically, and an upper part for variably adjusting the outlet opening degree of the variable flow paths 22a and 22b formed in the spool rod 22. It includes a retainer 32 and a lower retainer 34, and a housing 13 that surrounds the upper and lower retainers 32, 36 so as to form a high-pressure flow path and forms an appearance of the solenoid valve 10.

The retainer guide 12 is supported by the sealing member 5 and is hermetically mounted by the 0-ring 6 to be connected to the inner tube 2, and is partitioned from the outer tube 4 by the separator tube 1. In communication with the flow path. The housing 13 supported and mounted on the outer tube 4 is formed to be spaced apart from the retainer guide 12, and an adjustment screw 16 and an adjustment screw 16 for adjusting an initial position of the spool 24 are inserted and fastened. The spool rod 22 provided below from the plug 18 and the spool rod 22 are inserted to completely enclose an integrally formed interior of the upper retainer 32 and the lower retainer 36.

The spool rod 22 is supported and fixed to the mounting member 21, and the spool 24 is slidably inserted therein, and the plug 18 is provided on the upper side of the spool 24 with the operating rod 26 downward. Is elastically contact-supported by an elastic spring.

In addition, the spool rod 22 is formed with a series of first to third variable orifices 22a, 22b, 22c sequentially communicating the outside and the inside, and preferably, the spool 24 has a circular groove partially formed on the outer circumferential surface thereof. do.

Upper and lower retaining orifices 32a and 36a are formed in the upper retainer 32 and the lower retainer 36, each of which is inserted into the spool rod 22 and is arranged in close contact with the upper and lower sides, and the upper retainer 32 extends from the inner circumferential surface to the outer circumferential surface thereof. A through hole 32b penetrates, and a lower portion of the upper disk 34 is provided with a main disk 34 for generating a flow resistance to the fluid flowing from the fixed orifice 32a. The pilot chamber 36b is formed by being spaced apart from the upper side of the lower retainer 36 while being supported by the valve seat protruding from the lower side.

The pilot outlet valve 38 contacted and supported by the valve seat protruding from the lower retainer 36 is arranged to elastically block the fluid flowing through the lower fixed orifice 36a.

The operation of the solenoid valve of the conventional shock absorber having such a structure is performed as follows.

The fluid pressurized by the pressure generated inside the shock absorber (not shown) flows in through the retainer guide 12 of the solenoid valve 10 through the high pressure flow path 2a, and part of the fluid flowing therein is a plug 18. ) While the other part flows through a flow path formed along the inner surface of the retainer guide 12.

The high pressure fluid flowing along the inner surface of the retainer guide 12 passes through the upper fixing orifice 32a of the upper retainer 32 and enters the pilot chamber 36b while pressing and pushing the main valve 34 to partially pass the pressure. Flows through the lower stationary orifice 36a of the lower retainer 36 and the other part flows into the spool rod 22 through the second variable orifice 22b of the spool rod 22.

The fluid passing through the second variable orifice 22b flows into the first variable orifice 22a through a groove formed irregularly on the inner circumferential surface of the spool 24 and passes through the outlet hole 32b of the upper retainer 32. It flows out into the low pressure flow path 4a along the flow path formed between the upper retainer 32 and the housing 13.

Here, since the spool 24 is elastically supported to be slidable up and down by the elastic springs 19 and 29 installed at the upper and lower sides, the spool 24 is variable in position according to the pressing force of the fluid acting on the plug 18, and thus irregularly. The groove of the outer peripheral surface to be formed is positioned relative to the first to third variable orifices 22a to 22c formed in the spool rod 22, thereby opening and closing the flow and adjusting the magnitude of the flow resistance.

In addition, the fluid passing from the pilot chamber 36b through the lower fixed orifice 36a flows out by pressing and pushing the pilot outlet disk 38, which is spaced apart from the bottom of the lower retainer 36, to the inner peripheral surface of the housing 13. It flows out into the low pressure flow path 4a along the flow path formed closely.

In this way, the fluid circulating in the solenoid valve 10 flows out in a state where the high pressure action force when flowing from the shock absorber is significantly reduced. Therefore, the external force applied to the shock absorber is sufficiently reduced in the circulation process of the shock absorber and solenoid valve 10, thereby improving the riding comfort.

However, in the conventional solenoid valve 10, since the retainer guide 12 and the housing 13 are finely spaced apart to form a flow path therebetween, an increase in volume due to the overlapping structure and a finely formed flow path are fastened. In the case of strong bending by the nut 20 and overall bending, the flow path is not sufficiently secured or deformed to a desired degree by deformation, and thus it is not possible to guarantee the occurrence of precise damping force, and also the low pressure flow path 4a and the high pressure flow path 2a. Additional components, such as the sealing member 5 and the 0-ring 6, must be added between them to form a communication flow path with the solenoid valve 10 for each of the high or low pressure flow paths 2a and 4a. There is a problem that the rise, the difficulty of the manufacturing and assembly process is increased and the structural stability is reduced.

 SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simpler structure, but forms a sufficiently large communication flow path with the solenoid valve for each of the high pressure or low pressure flow paths so that a damping force is generated stably and is structurally stable. It is to provide a solenoid valve of the absorber.

In the solenoid valve of the shock absorber of the present invention for realizing such an object, one side of the housing is directly connected to the shock absorber in which an inner high pressure flow path and an outer low pressure flow path are formed by inserting a separator tube between an outer pipe and an inner pipe. A solenoid valve coupled and communicating with a high pressure flow path through a hollow hole formed by a retainer guide, wherein the housing and the outer tube each have a low pressure hole formed in a side wall, and each includes a solenoid cap which is hermetically surrounded to communicate the low pressure hole. It is characterized by.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

The same reference numerals refer to the same parts as in the related art, and description thereof will be omitted.

2 is a cross-sectional view showing a solenoid valve of a shock absorber according to the present invention.

In the shock absorber, the separator tube 1 is inserted between the outer tube 4 and the inner tube 2 to form an inner high pressure passage 2a and an outer low pressure passage 4a.

The solenoid valve 10 is directly coupled to one side of the housing 14 to the outer circumferential surface of the outer tube 4 of the shock absorber, and the retainer guide 12 is provided inside the side to which the housing 14 of the solenoid valve 10 is coupled. Is communicated with the high pressure flow path (2a) through a hollow hole formed through the outer tube (4) and the inner tube (2) of the shock absorber.

That is, the retainer guide 12 does not have an overlap with the housing 14 and forms only a hollow hole with the high pressure flow passage 2a extending from the inner tube 2 of the shock absorber.

Preferably, the retainer guide 12 penetrates through the outer tube 4 and the separator tube 1 to form a hollow hole between the high pressure passage 2a and the solenoid valve 10, while still being airtight with respect to the low pressure passage 4a. It may include a sealing member (12a) which is superimposed in order to be installed.

The housing 14 and the outer tube 4 are formed with low pressure holes 14b and 4b on the sidewalls, respectively, and the solenoid caps 7 are covered to surround the low pressure holes 14b and 4b, and the solenoid caps 7 are blocked. The communication path with the low pressure flow path 4a is secured through the inner space of the circumference.

The upper retainer 32, which primarily generates the damping force with respect to the high pressure fluid flowing into the solenoid valve 10, is directly supported by the housing 14 so that the fluid circulating inside the solenoid valve 10 receives the upper retainer 32. Passing through) blocks the introduction of the retainer guide 12 into the hollow hole.

The adjusting screw 16, the plug 18, the spool rod 22, the spool 24, the actuating rod 26 and the elastic springs 19, 29 disposed inside the solenoid valve 10 are conventional solenoid valves. Since it is the same as, the description is omitted.

The operation of the solenoid valve of the shock absorber having such a structure is performed as follows.

The fluid stored in the shock absorber is pressurized when a high pressure action force is applied from the outside to access the solenoid valve 10 through the high pressure flow path 2a and through the hollow hole formed by the retainer guide 12. 10) It is introduced inside.

The high pressure fluid flowing into the solenoid valve 10 passes through the upper fixing orifice 32a formed in the upper retainer 32 which is in direct contact with the inner circumferential surface of the housing 14, and the lower side of the upper retainer 32. The main valve 34, which is contacted and supported at a distance from the outlet, is pushed out.

A part of the fluid which flows out to the main valve 34 passes through the lower fixed orifice 36a of the lower retainer 36 and the other part passes through the second variable orifice 24b formed in the spool rod 22 to spool ( 24, the first variable orifice 24a enters through the groove of the surface and passes through the outlet hole 32b of the upper retainer 32 to the space formed by the side of the housing 14 and the upper retainer 32.

Since the low pressure hole 14b is formed in the housing 14, the fluid passes through the low pressure hole 14b and passes through the inner space of the solenoid cap 7 which surrounds the outside of the low pressure hole 14b so as to be blocked from the outside. It flows into the low pressure flow path 4a through the low pressure hole 4b formed in 4).

As described above, according to the preferred embodiment of the present invention, the passages for communication with the high pressure passage 2a or the low pressure passage 4a are separately spaced apart from each other without being formed in a narrow space adjacent to each other to ensure a sufficiently large flow passage. To stabilize the flow.

What has been described above is only one embodiment for implementing the solenoid valve of the shock absorber according to the present invention, the present invention is not limited to the above-described embodiment, the field to which the present invention belongs without departing from the gist of the present invention Anyone skilled in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, the solenoid valve of the shock absorber according to the present invention forms a passage for communicating with the solenoid valve separately for the high pressure passage and the low pressure passage to ensure a wider communication path and thus the flow is stable and thus the damping force is stable. When the retainer guide and the housing are finely spaced apart and the housing is strongly coupled by the fastening nut, the structure is deformed by bending, and the flow path formed by the fine spaced overlap is also deformed to change the damping force. The possibility is fundamentally blocked by a single housing structure to obtain structural stability, and since the solenoid valve is installed to protrude from the shock absorber, the effective space can be secured through a simple structure.

Claims (2)

The separator tube is inserted between the outer tube and the inner tube so that one side of the housing is directly coupled to the shock absorber in which the inner high pressure passage and the outer low pressure passage are formed, and communicate with the high pressure passage through the hollow hole formed by the retainer guide. In the solenoid valve The housing and the outer tube are each formed with a low pressure hole in the side wall, And a solenoid cap hermetically surrounding the low pressure hole to communicate with the solenoid valve. The method of claim 1, The solenoid valve of the shock absorber, characterized in that the upper retainer for generating a damping force primarily against the high-pressure fluid flowing into the solenoid valve is directly in close contact with the housing.

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