KR102373375B1 - Body valve assembly of shock absorber - Google Patents

Abstract

The present invention is installed at the lower end of the inner cylinder of the cylinder of the shock absorber, so that the working fluid flows from the inner cylinder to the reservoir chamber between the inner cylinder and the outer cylinder during the compression and tension strokes of the shock absorber or from the reservoir chamber to the inner cylinder to the valve body; a housing disposed above the valve body and provided therein with an operating space that communicates with a space inside the inner cylinder and communicates with each other between the inner cylinder and the reservoir chamber through the valve body; a free piston embedded in the housing and elevating in the working space according to the compression and tension strokes of the shock absorber; and a regulating unit provided in the housing and the housing and the valve body to prevent the free piston from rising by a predetermined level or more and from descending the free piston by a predetermined level or more, frequency-sensitive The present invention relates to a body valve assembly of a shock absorber capable of not only improving riding comfort through a function, but also improving vehicle performance through a pressure sensitive function.

Description

The body valve assembly of the shock absorber {BODY VALVE ASSEMBLY OF SHOCK ABSORBER}

The present invention relates to a body valve assembly for a shock absorber, and more particularly, to a body valve of a shock absorber that not only improves riding comfort through a frequency response function, but also improves vehicle performance through a pressure response function It's about assembly.

In general, the shock absorber serves to support the weight of the vehicle body and at the same time suppress and attenuate vibration transmitted from the road surface to the vehicle body.

Therefore, since the shock absorber constantly receives vibrations or shocks from the road surface through the wheels while driving, a shock absorber is installed between the vehicle body (or frame) and the axle to prevent the shock or vibration from being directly transmitted to the vehicle body, thereby improving riding comfort.

The suction valve of the existing shock absorber largely includes a piston rod inserted from the outside by sliding and reciprocating an inner tube filled with fluid, and a body valve fixedly installed below the inner tube opposite the piston valve connected to the lower end of the piston rod do.

In this conventional body valve, a flow path is formed in a single unit by the working fluid flowing during the tension and compression strokes, and the damping force in all sections from low speed to high speed is determined by the spring constant of the leaf spring disk above the body valve.

Accordingly, if the damping force in the low-speed section is increased, there is a problem in that the damping force in the high-speed section is excessively increased.

In addition, when the rigidity of the piston compression side among the existing body valves is increased, cavitation occurs and distortion of the damping force graph occurs, so that there is a limitation in smoothly adjusting the damping force.

Patent Publication No. 10-2006-0014637

The present invention was invented to improve the above problems, and the body valve assembly of a shock absorber that not only promotes the improvement of riding comfort through the frequency response function, but also improves the vehicle performance through the pressure response function. is to provide

In order to achieve the above object, the present invention is installed at the lower end of the inner cylinder of the cylinder of the shock absorber, and during the compression and tension stroke of the shock absorber, the working fluid flows from the inner cylinder to the reservoir chamber between the inner cylinder and the outer cylinder, or a valve body to flow from the reservoir chamber to the inner cylinder; a housing disposed above the valve body and provided therein with an operating space that communicates with a space inside the inner cylinder and communicates with each other between the inner cylinder and the reservoir chamber through the valve body; a free piston embedded in the housing and elevating in the working space according to the compression and tension strokes of the shock absorber; and a regulating unit provided in the housing and the housing and the valve body to prevent the free piston from rising to a certain degree or more and from descending the free piston to a certain degree or more. A body valve assembly may be provided.

Here, the housing includes a body body forming the working space, at least one upper main orifice penetrating through the upper surface of the body body to communicate the inner cylinder and the working space with each other, and penetrating through the lower surface of the body body, and at least one lower main orifice communicating with the tension passage and the compression passage of the valve body, respectively, and the lower surface of the body body penetrates a regulating fixing pin of the regulating unit to prevent the free piston from descending by more than a certain degree characterized in that

In this case, the regulating unit includes a lifting regulating step formed to be stepped upward from the inner edge of the lower surface of the body body to a predetermined height, and the outer peripheral surface of the free piston is elevating and reciprocating along the inner peripheral surface of the upward regulating step. do it with

And, the free piston divides the working space into upper and lower spaces, and in contact with the inner circumferential surface of the housing, an elevating body forming an outer circumferential surface for elevating and reciprocating inside the working space, and vertically penetrating through the elevating body A plurality of auxiliary orifices communicating the upper and lower spaces with each other, a protrusion protruding from the lower surface of the elevating body toward the lower surface of the housing, and recessed upward from the lower surface of the protrusion, the valve body and the lower surface of the housing It characterized in that it comprises a pin seating groove formed in a shape corresponding to the upper end of the regulating fixing pin of the regulating unit coupled through it.

In addition, the free piston includes a seating protrusion protruding from the upper surface of the elevating body accommodated in the housing, a cap body seating on the seating protrusion, and extending along an edge of the lower end of the cap body to form an integral body with the cap body , It characterized in that it further comprises a cap flange covering the upper end of each of the plurality of auxiliary orifices disposed radially with respect to the seating protrusion.

In addition, the body valve assembly of the shock absorber includes a first spring having a lower end seated on the cap flange and supported by the cap body, and a first spring recessed into the inner upper surface of the housing so that the upper end of the first spring is supported. A seating groove, a second spring seating groove recessed to a predetermined diameter in the lower surface of the elevating body, an upper end portion of which is seated in the second spring seating groove, and a lower end portion further comprising a second spring seated on the inner lower surface of the housing characterized in that

And, the regulating unit includes a regulating fixing pin that penetrates from the center of the lower surface of the valve body and is exposed at a predetermined height to the working space through the lower surface of the housing, and is stepped upward from the inner edge of the lower surface of the housing to a predetermined height. It includes a rising regulating step formed, wherein the outer peripheral surface of the free piston elevates and reciprocates along the inner peripheral surface of the upward regulating step, the free piston is regulated to rise above the upper end of the upward regulating step, the upper end of the regulating pin It is characterized in that the abnormal descending is regulated.

In addition, the regulating fixing pin is characterized in that it further includes a pin through hole that penetrates up and down in a longitudinal direction of the regulating fixing pin to communicate the housing and the inner cylinder with the reservoir chamber.

According to the present invention having the above configuration, the following effects can be achieved.

First of all, the present invention is arranged on the upper part of the valve body to improve riding comfort through the frequency response function over the entire range from low to high frequencies from a structure including a housing in which a free piston built in the working space moves up and down. do.

In addition, the present invention can also promote the improvement of vehicle performance through the pressure response function according to the compression damping force through the valve body.

In addition, according to the present invention, it is possible to increase the durability life by preventing deterioration of the durability of the entire device due to excessive rise and fall of the free piston in advance, and to maintain uniform operating performance over a long period of time.

1 is a cross-sectional conceptual view showing the overall structure of a body valve assembly of a shock absorber according to an embodiment of the present invention;
2 is a cross-sectional conceptual view illustrating the behavior of a working fluid during a compression stroke in a low-amplitude section of a high-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention;
3 is a cross-sectional conceptual view illustrating the behavior of a working fluid during a tensile stroke in a low-amplitude section of a high-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention;
4 is a cross-sectional conceptual view illustrating the behavior of a working fluid during a compression stroke in a high-amplitude section of a low-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention;
5 is a cross-sectional conceptual view illustrating the behavior of a working fluid during a tensile stroke in a high-amplitude section of a low-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention;

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.

In the present specification, the present embodiment is provided to complete the disclosure of the present invention, and to fully inform those of ordinary skill in the art to which the present invention pertains to the scope of the invention.

And the invention is only defined by the scope of the claims.

Accordingly, in some embodiments, well-known components, well-known operations, and well-known techniques have not been specifically described to avoid obscuring the present invention.

In addition, like reference numerals refer to like elements throughout the specification, and terms used (referred to) in this specification are for the purpose of describing the embodiments and are not intended to limit the present invention.

In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase, and elements and operations referred to as 'comprising (or having)' do not exclude the presence or addition of one or more other elements and operations. .

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs.

In addition, terms defined in a commonly used dictionary are not ideally or excessively interpreted unless they are defined.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional conceptual view showing the overall structure of a body valve assembly of a shock absorber according to an embodiment of the present invention.

It can be understood that the present invention has a structure including a valve body 100 , a housing 200 , a free piston 300 , and a regulating unit 500 as shown.

First, the valve body 100 is installed at the lower end of the inner cylinder 410 of the cylinder 400 of the shock absorber, and the working fluid during the compression and tension stroke of the shock absorber is transferred from the inner cylinder 410 to the inner cylinder 410 and the outer cylinder 420. It is to flow to the reservoir chamber 415 between, or to flow from the reservoir chamber 415 to the inner cylinder (410).

That is, the valve body 100 is intended to improve vehicle performance through a compression damping force like the conventional body valve for a shock absorber.

And, the housing 200 is disposed on the upper part of the valve body 100 and communicates with the space inside the inner cylinder 410 and, at the same time, between the inner cylinder 410 and the reservoir chamber 415 through the valve body 100. A working space 201 that communicates with each other is provided therein.

And, the free piston 300 is built in the housing 200, it is to rise and fall in the working space 201 according to the compression and tension stroke of the shock absorber.

That is, the housing 200 in which the free piston 300 is accommodated is intended to improve riding comfort through a frequency response function over the entire range from low to high frequencies.

In addition, the regulating unit 500 is provided in the housing 200, the housing 200, and the valve body 100, and the free piston 300 rises to a certain degree or more, and the free piston 300 rises to a certain degree or more. to prevent it from descending.

That is, the regulating unit 500 is provided to prevent deterioration of the overall durability of the device due to the excessive rise and fall of the free piston 300 in advance to increase the durability, and to maintain uniform operating performance over a long period of time.

It goes without saying that the present invention can be applied to the above-described embodiments, and can also be applied to the following various embodiments.

First, it can be understood that the valve body 100 has a structure in which the compression passage 120 and the tension passage 130 are largely provided in the valve body 110 .

The valve body 110 has a press-fitting step 111 on which the lower end of the inner cylinder 410 is seated and fixed, and a regulation fixing pin 510 of the regulation unit 500 to be described later passes through the center.

At least one compression passage 120 vertically penetrates the valve body 110 with the regulating fixing pin 510 as a center, so that the working fluid flows from the inner cylinder 410 to the reservoir chamber 415 during the compression stroke. will do

At least one tension passage 130 vertically penetrates through the valve body 110 with the regulation fixing pin 510 as the center, so that the working fluid flows from the reservoir chamber 415 to the inner cylinder 410 during the tension stroke. will do

Here, the valve body 100 is caught and fixed by the head portion 512 of the regulation fixing pin 510 in order to improve vehicle performance through the implementation of the compression damping force, and at least one disk-S and a plurality of disks are multi-staged. It may further include a disc assembly 150 that is stacked and opens and closes the lower ends of each of the one or more compression passages 120 and tension passages 130 .

At this time, the valve body 100 is extended from the lower end edge of the valve body 110 for seating and fixing of the valve body 110 to further include a skirt portion 140 fixed to the bottom surface of the outer cylinder 420 of the shock absorber. can

In addition, the valve body 100 is cut from the edge of the lower end of the skirt portion 140 to allow the circulation of the working fluid during the compression stroke and the tension stroke, and a cutout 141 for communicating the inner cylinder 410 and the reservoir tank with each other. Of course, it is also possible to provide more.

On the other hand, it can be understood that the housing 200 has a structure having upper and lower main orifices 220 and 230 on the upper and lower surfaces of the body body 210 .

The body body 210 forms the working space 201 , and by allowing the inflow and discharge of the working fluid into the working space 201 , it is possible to realize damping performance according to frequency response.

At least one upper main orifice 220 penetrates through the upper surface of the body body 210 to communicate the inner cylinder 410 and the working space 201 with each other.

At least one lower main orifice 230 penetrates the lower surface of the body body 210 to communicate with the tension passage and the compression passage of the valve body 100 , respectively.

Here, the lower surface of the body body 210 prevents the free piston 300 from descending to a certain extent or more by passing a regulating fixing pin 510 of a regulating unit 500 to be described later.

At this time, the body main body 210 includes at least one relief groove 211 recessed to a predetermined depth from the edge of the lower end of the lift control step 520 to a predetermined height, and the relief step 211 from the upper end of the relief groove 211 . It is also possible to apply the embodiment further including the inclined groove portion 212 formed to be inclined to the inner circumferential surface of the 520 .

In addition, the relief groove portion 211 and the inclined groove portion 212 are provided to relieve to a certain extent the pressure pulsation caused by the rapid circulation of the working fluid during the compression and tension strokes of the shock absorber, and at the same time, the shock absorber in the high amplitude section of the low frequency region. When is a compression stroke, a flow path (refer to FIG. 4 below) for allowing the working fluid to flow through the lower main orifice 230 is provided.

On the other hand, the free piston 300 is to improve riding comfort through the implementation of damping performance according to frequency response, and divides the working space 201 into upper and lower spaces 201a and 201b, and the housing 200 . In contact with the inner peripheral surface of the working space 201 includes an elevating body 310 forming an outer peripheral surface that reciprocates.

In addition, the free piston 300 includes a plurality of auxiliary orifices 311 penetrating vertically through the elevating body 310 to communicate the upper and lower spaces 201a and 201b with each other.

In addition, the free piston 300 includes a protrusion 320 protruding from the lower surface of the elevating body 310 toward the lower surface of the housing 200 .

In addition, the free piston 300 is recessed upward from the lower surface of the protrusion 320 , and the regulating fixing pin 510 of the regulating unit 500 to be described later is coupled through the lower surface of the valve body 100 and the housing 200 . ) includes a pin seating groove 330 formed in a shape corresponding to the upper end.

That is, the lifting body 310 is regulated to be lowered beyond the position where the upper end of the regulating fixing pin 510 is coupled to the pin seating groove 330 .

On the other hand, the free piston 300 allows the working fluid to flow through the auxiliary orifice 311 during the tensile stroke in the high amplitude section of the low frequency region (refer to FIG. 5 below), but in other sections, that is, the high amplitude section of the low frequency region In the compression stroke, or during the compression and tension strokes in the low-amplitude section of the high-frequency region, the seating protrusion 312, the cap body 340, and the cap flange 350 to block the working fluid from flowing through the auxiliary orifice 311. may further include.

That is, the seating protrusion 312 protrudes from the upper surface of the elevating body 310 accommodated in the housing 200 , and the cap body 340 is seated on the seating protrusion 312 .

In addition, the cap flange 350 extends along the edge of the lower end of the cap body 340 to form an integral body with the cap body 340 , and a plurality of auxiliary orifices 311 radially arranged around the seating protrusion 312 . It covers the top of each.

Accordingly, the cap body 340 and the cap flange 350 move upward through the plurality of auxiliary orifices 311 from the lower part of the elevating body 310 during the tensile stroke of the shock absorber in the high amplitude section of the low frequency region as shown in FIG. 5 . By being spaced apart from the seating protrusion 312 by the flowing working fluid, the working fluid is allowed to flow through the outside of the housing 200 through the upper portion of the lifting body 310 through the plurality of auxiliary orifices 311 .

On the other hand, the present invention will be described in more detail with reference to FIG. 1 again, so that the free piston 300 can return to the neutral position as shown in FIG. 1 in compression and tension strokes corresponding to various amplitudes in various frequency regions A first spring 610 and a second spring 620 are further provided, and the first and second spring seating grooves 213 and 313 may be further provided as a support structure of the first and second springs 610 and 620 . There will be.

That is, the lower end of the first spring 610 is seated on the cap flange 350 and supported by the cap body 340 , and the first spring mounting groove 213 is a housing such that the upper end of the first spring 610 is supported. (200) is depressed in the inner upper surface.

In addition, the second spring seating groove 313 is recessed to a predetermined diameter in the lower surface of the elevating body 310, the upper end of the second spring 620 is seated in the second spring seating groove 313, the second spring The lower end of the 620 is to be seated on the inner lower surface of the housing 200 .

In the present invention, the diameter of the first spring 610 is shown to be smaller than that of the second spring 620, but it is not necessarily limited to this structure, and the diameters of the first and second springs 610 and 620 are the same. Of course, it is also possible to design and modify applications such as making and disposing the first spring 610 larger than the diameter of the second spring 620 and disposing it.

In addition, by making the spring stiffness of the first spring 610 and the second spring 620 the same or different from each other, it will be able to serve as a frequency-sensitive device to respond widely to various frequency ranges and various amplitude sections. .

On the other hand, the regulating unit 500 is a regulating fixing pin 510 that penetrates from the center of the lower surface of the valve body 100 , that is, the valve body 110 , and is exposed to the working space 201 at a predetermined height through the lower surface of the housing 200 . ), and the housing 200 , that is, it can be understood that the structure includes a lift regulating step portion 520 that is stepped upward from the inner edge of the lower surface of the body body 210 to a predetermined height.

Here, it can be understood that the free piston 300 , that is, the outer circumferential surface of the elevating body 310 has a structure that elevates and reciprocates along the inner circumferential surface of the lift regulating step 520 .

At this time, the lifting body 310 of the free piston 300 is regulated to rise above the upper end of the rise regulating step portion 520 , and to be lowered above the upper end of the regulating fixing pin 510 , thereby regulating the free piston 300 . ), it is possible to increase the durability by preventing deterioration of the durability of the entire device due to excessive rise and fall, and to maintain uniform operating performance over a long period of time.

In addition, it is preferable that the regulating pin 510 further form a pin through hole 511 to allow the working fluid to flow into the inner space of the inner cylinder 410 from the reservoir chamber 415 during the tensile stroke.

The pin through hole 511 penetrates vertically along the longitudinal direction of the regulating fixing pin 510 to communicate the housing 200 and the inner cylinder 410 with the reservoir chamber 415 .

Using the body valve assembly of the shock absorber according to an embodiment of the present invention having the above configuration, the behavior of the working fluid and the operating mechanism for each component will be described with reference to FIGS. 2 to 5 .

For reference, FIG. 2 is a cross-sectional conceptual view illustrating a behavior of a working fluid during a compression stroke in a low-amplitude section of a high-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention.

And, FIG. 3 is a cross-sectional conceptual view illustrating the behavior of a working fluid during a tensile stroke in a low-amplitude section of a high-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention.

And, FIG. 4 is a cross-sectional conceptual view showing the behavior of a working fluid during a compression stroke in a high-amplitude section of a low-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention.

5 is a cross-sectional conceptual view illustrating a behavior of a working fluid during a tensile stroke in a high-amplitude section of a low-frequency region using the body valve assembly of a shock absorber according to an embodiment of the present invention.

For reference, reference numerals not indicated in FIGS. 2 to 5 refer to FIG. 1 .

First, the working fluid is introduced into the upper space 201a of the working space 201 through the upper main orifice 220 from the inner space of the inner cylinder 410 during the compression stroke in the low-amplitude section of the high-frequency region as shown in FIG. 2 , The introduced working fluid acts as a pressure for lowering the lifting body 310 of the free piston 300 .

At the same time, the first spring 610 is extended and the second spring 620 is contracted by the pressure of the working fluid pressed down in the upper space 201a.

Thereafter, the working fluid accommodated in the lower space 201b under the elevating body 310 passes through the compression passage 120 of the valve body 110 through the lower main orifice 230 and the cutout 141 of the valve body 100 . ) through the reservoir chamber 415 .

Continuing, immediately before conversion to the tensile stroke in the low amplitude section of the high frequency region, the first and second springs 610 and 620 generate elastic restoring force to move the lifting body 310 of the free piston 300 to the initial stage as shown in FIG. 1 . momentarily return to position.

However, since the amount of the working fluid flowing into the upper space 201a during the compression stroke in the low-amplitude section of the high-frequency region is relatively small compared to the high-amplitude section of the low-frequency region to be described later, the pin seating groove 330 of the elevating body 310 is ) does not descend enough to come into contact with the upper end of the regulating fixing pin 510 .

On the other hand, the working fluid is temporarily returned from the state of FIG. 2 to the state of FIG. 1, and as shown in FIG. 3, during the tensile stroke in the low-amplitude section of the high frequency region, the working space from the reservoir chamber 415 through the pin through hole 511 ( The working fluid flows into the lower space 201b of the 201 , and applies a pressure to raise the lifting body 310 .

At the same time, the second spring 620 is extended and the first spring 610 is contracted by the pressure of the working fluid pushed up in the lower space (201b).

Thereafter, the working fluid accommodated in the upper space 201a of the upper part of the elevating body 310 flows into the inner space of the inner cylinder 410 through the upper main orifice 220 .

Here, the lifting body 310 is pushed up to the upper end of the ascending regulating step 520 , but is not raised excessively by the ascending regulating step 520 and is caught.

Continuing, immediately before conversion to the compression stroke in the low-amplitude section of the high-frequency region, the first and second springs 610 and 620 generate elastic restoring force to move the lifting body 310 of the free piston 300 to the initial stage as shown in FIG. momentarily return to position.

On the other hand, the working fluid is introduced into the upper space 201a of the working space 201 through the upper main orifice 220 from the inner space of the inner cylinder 410 during the compression stroke in the high amplitude section of the low frequency region as shown in FIG. 4, The introduced working fluid acts as a pressure for lowering the lifting body 310 of the free piston 300 .

At the same time, the first spring 610 is extended, and the second spring 620 is contracted by the pressure of the working fluid pressed down in the upper space 201a.

Thereafter, the working fluid accommodated in the lower space 201b under the elevating body 310 passes through the compression passage 120 of the valve body 110 through the lower main orifice 230 and the cutout 141 of the valve body 100 . ) through the reservoir chamber 415 .

Continuing, immediately before conversion to the tensile stroke in the low-amplitude section of the high-frequency region, the first and second springs 610 and 620 generate elastic restoring force to move the lifting body 310 of the free piston 300 to the initial stage as shown in FIG. momentarily return to position.

However, since the amount of the working fluid flowing into the upper space 201a during the compression stroke in the high-amplitude section of the low-frequency region is relatively large compared to the low-amplitude section of the high-frequency region, the pin seating groove 330 of the elevating body 310 is It descends until it comes into contact with the upper end of the regulation fixing pin 510 .

In addition, since the amount of inflow of the working fluid is large in the high amplitude section of the low frequency region as described above, the lifting body 310 descends to the vicinity of the point where the inclined groove 212 and the relief groove 211 meet, at this time the working fluid is discharged through the lower space 201b and the lower main orifice 230 through the inclined groove portion 212 and the relief groove portion 211 .

As such, the working fluid discharged through the lower main orifice 230 is controlled through the disk assembly 150 under the valve body 110 to generate a compression damping force, that is, a damping force.

On the other hand, the working fluid is temporarily returned from the state of FIG. 4 to the state of FIG. 1, and as shown in FIG. 5, during the tensile stroke in the high amplitude section of the low frequency region, the working space from the reservoir chamber 415 through the pin through hole 511 ( The working fluid flows into the lower space 201a of the 201 , and applies a pressure to raise the lifting body 310 .

At the same time, the second spring 620 is extended and the first spring 610 is contracted by the pressure of the working fluid pushed up in the lower space (201b).

Thereafter, the working fluid accommodated in the upper space 201a of the upper part of the elevating body 310 flows into the inner space of the inner cylinder 410 through the upper main orifice 220 .

Here, the lifting body 310 is pushed up to the upper end of the ascending regulating step 520 , but is not raised excessively by the ascending regulating step 520 and is caught.

However, since the amount of the working fluid flowing into the lower space 201b during the tensile stroke in the high-amplitude section of the low-frequency region is relatively larger than that of the low-amplitude section of the high-frequency region, the rising pressure by the working fluid acts more.

Accordingly, the working fluid introduced into the lower space 201b acts as a pressure to push up the cap flange 350 through the auxiliary orifice 311 , and the cap body 340 together with the cap flange 350 also has a seating protrusion. While being spaced apart from the 312 , the working fluid additionally flows through the upper space 201a and into the inner space of the inner cylinder 410 through the upper main orifice 220 .

Continuing, immediately before conversion to the compression stroke in the high amplitude section of the low frequency region, the first and second springs 610 and 620 generate elastic restoring force to move the lifting body 310 of the free piston 300 to the initial stage as shown in FIG. 1 . momentarily return to position.

As described above, the present invention is a basic technical idea to provide a body valve assembly of a shock absorber that not only promotes the improvement of riding comfort through the frequency response function, but also improves the vehicle performance through the pressure response function. can be known

And, within the scope of the basic technical spirit of the present invention, many other modifications and applications are also possible for those of ordinary skill in the art.

100...valve body
110...valve body
111...press-fitting step
120...compression passage
130...tensile passage
140... Skirt
141...incision
150...disc assembly
200...housing
201...working space
201a, 201b...Upper, lower space
210...body
211...Relief Home
212... Inclined groove
213...First spring seating groove
220...upper main orifice
230...lower main orifice
300...free piston
310...Elevating body
311...Auxiliary Orifice
312...seated stone
313...Second spring seating groove
320...Protrusion
330...pin seating groove
340...Cap body
350...cap flange
400...cylinder
410...inner pain
415...reservoir chamber
420...outer cylinder
500...regulatory units
510...regulatory retaining pins
511...pin through hole
512... head
520...Rise regulation step part
610...first spring
620...second spring

Claims (8)

A valve body that is installed at the lower end of the inner cylinder of the cylinder of the shock absorber and causes a working fluid to flow from the inner cylinder to the reservoir chamber between the inner cylinder and the outer cylinder during the compression and tension strokes of the shock absorber or to flow from the reservoir chamber to the inner cylinder ;
a housing disposed above the valve body and provided therein with an operating space that communicates with a space inside the inner cylinder and communicates with each other between the inner cylinder and the reservoir chamber through the valve body;
a free piston embedded in the housing and elevating in the working space according to the compression and tension strokes of the shock absorber; and
and a regulating unit provided in the housing and the housing and the valve body to prevent the free piston from rising to a certain degree or more and from descending the free piston to a certain degree or more,
The free piston
an elevating body dividing the working space into upper and lower spaces, and forming an outer circumferential surface for elevating and reciprocating inside the working space by contacting the inner circumferential surface of the housing;
A plurality of auxiliary orifices passing vertically through the elevating body to communicate the upper and lower spaces with each other;
a seating protrusion protruding from the upper surface of the elevating body accommodated in the housing;
a cap body that is seated on the seating protrusion;
a cap flange extending along the edge of the lower end of the cap body to form an integral body with the cap body, and covering the upper end of each of the plurality of auxiliary orifices radially arranged around the seating protrusion;
The cap body and the cap flange are
A body valve assembly of a shock absorber that may be provided to be spaced apart from the seating protrusion by a working fluid flowing upward through the plurality of auxiliary orifices from a lower portion of the lifting body.
The method according to claim 1,
The housing is
a body body forming the working space;
At least one upper main orifice penetrating through the upper surface of the body body to communicate the inner cylinder and the working space with each other;
and at least one lower main orifice that penetrates through the lower surface of the body body and communicates with the tension passage and the compression passage of the valve body, respectively,
The body valve assembly of the shock absorber, characterized in that the lower surface of the body body, the regulating fixing pin of the regulating unit to prevent the free piston from descending more than a certain degree.
3. The method according to claim 2,
The regulatory unit is
It includes a rising regulating step portion formed to be stepped upward from the inner edge of the lower surface of the body body to a predetermined height,
The outer peripheral surface of the free piston is a shock absorber body valve assembly, characterized in that the lifting and reciprocating along the inner peripheral surface of the lifting regulation step.
The method according to claim 1,
The free piston is
a protrusion protruding from the lower surface of the elevating body toward the lower surface of the housing;
It further comprises a pin seating groove recessed upward from the lower surface of the protrusion and formed in a shape corresponding to the upper end of the regulating fixing pin among the regulating units coupled through the lower surface of the valve body and the housing. The body valve assembly of the shock absorber.

delete The method according to claim 1,
The body valve assembly of the shock absorber,
a first spring having a lower end seated on the cap flange and supported by the cap body;
a first spring seating groove recessed in the inner upper surface of the housing so that the upper end of the first spring is supported;
a second spring seating groove recessed to a predetermined diameter in the lower surface of the elevating body;
The body valve assembly of the shock absorber, characterized in that the upper end portion is seated in the second spring seating groove, the lower end further comprises a second spring seated on the inner lower surface of the housing.
The method according to claim 1,
The regulatory unit is
a regulating fixing pin penetrating from the center of the lower surface of the valve body and exposed at a predetermined height to the working space through the lower surface of the housing;
It includes a rising regulating step portion formed to be stepped upward from the inner edge of the lower surface of the housing to a certain height,
The outer circumferential surface of the free piston reciprocates up and down along the inner circumferential surface of the rise regulating step portion,
The free piston body valve assembly of the shock absorber, characterized in that it is regulated to rise above the upper end of the upward regulating step portion, and to descend more than the upper end of the regulating fixing pin.
8. The method according to any one of claims 2, 4 or 7,
The regulation fixing pin,
The body valve assembly of the shock absorber further comprises a pin through hole penetrating vertically along the longitudinal direction of the regulating pin to communicate the housing and the inner cylinder with the reservoir chamber.

Images