shock absorber

Abstract

A shock absorber is disclosed. The shock absorber includes a cylinder filled with a fluid, and a piston valve coupled to an end of a piston rod to divide an inside of the cylinder into a rebound chamber and a compression chamber, and a lower gasket is fastened to the piston valve at a lower end of the piston valve, and the shock absorber further includes a guide member disposed to be spaced apart from a lower side of the piston valve so as to be movable forward and backward within the cylinder, and having a connection flow path to communicate a pressurization chamber formed at the lower side and the compression chamber, a bumper member disposed to be compressible in the pressurization chamber to elastically support the guide member, and a support member coupled to an end of the cylinder to support a lower end of the bumper member and having a communication hole to communicate with the pressurization chamber, wherein the bumper member divides the pressurization chamber into a first pressurization chamber and a second pressurization chamber, and has a plurality of side holes to communicate the first pressurization chamber and the second pressurization chamber.

Description

Technical Field

[0001] The present disclosure relates to a shock absorber, and more particularly, to a shock absorber capable of applying an additional damping force to an impact amount transmitted from a road surface during a compression stroke and cushioning the impact at an extremely low speed during the compression stroke, thereby improving ride comfort and steering stability. Background Art

[0002] Generally, a shock absorbing device is installed in a vehicle to improve ride comfort by buffering shock or vibration received by an axle from a road surface during traveling, and a shock absorber is used as one of such shock absorbers.

[0003] The shock absorber operates in response to vibrations of the vehicle depending on road conditions, and in this case, the damping force generated by the shock absorber varies depending on the operating speed of the shock absorber, that is, depending on whether the operating speed is fast or slow.

[0004] Since the ride comfort and driving stability of a vehicle can be controlled depending on how the characteristics of the damping force generated by the shock absorber are adjusted, it is very important to control the damping force characteristics of the shock absorber when designing a vehicle.

[0005] Such a shock absorber generally includes a cylinder filled with working fluid (oil), a piston rod connected to the vehicle body side for reciprocating motion, and a piston valve coupled to the lower end of the piston rod to slide in the cylinder and control the flow of the working fluid.

[0006] Piston valves are designed to have constant damping characteristics using a single flow path at high, medium, and low speeds. However, such piston valves have a structure that makes it difficult to apply damping force when the compression stroke is performed at extremely low speeds.

[0007] In addition, in the case where the piston rod performs a compression stroke exceeding a certain stroke, it is necessary to fix the cylinder to a certain length or more, and this has a disadvantage that the length and volume of the shock absorber are excessively increased.

[0008] Korean Patent Publication No. 10-2018-0083725 has been disclosed as an example of a conventional shock absorber. Summary of the Invention

[0009] One aspect of the present disclosure provides a shock absorber capable of preventing its length and volume from excessively increasing by applying an additional damping force during a compression stroke exceeding a certain stroke.

[0010] One aspect of the present disclosure provides a shock absorber capable of improving ride comfort and regulatory stability of a vehicle by applying a gradual damping force during a compression stroke exceeding a certain stroke.

[0011] Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.

[0012] and a tube connecting the dischar e side of the piston rod and the piston rod of the piston rod, wherein the tube has a lower end for receiving the piston and the piston rod is connected with the tube connecting the dischar e side of the piston rod and the piston rod is connected with the tube connecting the dischar e side of the piston rod.

[0013] The connecting flow path may include a first connecting flow path connecting the compression chamber and the first pressurizing chamber, and a second connecting flow path connecting the compression chamber and the second pressurizing chamber.

[0014] The guide member may include a plurality of upper protrusions formed to protrude from an upper surface thereof and arranged to be spaced apart from each other.

[0015] The guide member may include a plurality of lower grooves formed to be recessed on a lower surface thereof and arranged to be spaced apart from each other.

[0016] The second connection flow path may have an inlet formed at the plurality of upper protrusions and an outlet formed at the plurality of lower grooves.

[0017] The plurality of upper protrusions may be arranged at regular intervals.

[0018] The second connecting flow path can be opened and closed by rising and falling of the lower gasket.

[0019] One end of the buffer member may be coupled to the guide member and the other end coupled to the support member.

[0020] The buffer member may include a bellows portion configured to generate elastic force due to a restoring force against contraction or expansion, and a protrusion protruding from an outer surface of the bellows portion to restrict movement of the buffer member in the width direction.

[0021] A sealing member provided to seal a gap between an outer peripheral surface of the guide member and an inner peripheral surface of the cylinder may be mounted on the outer peripheral surface of the guide member.

[0022] The shock absorber may further include an outer tube disposed to be spaced apart from the outside of the cylinder to form a storage chamber between the cylinder and the outer tube.

[0023] The shock absorber may further include a body valve coupled to a lower end of the support member to communicate the connection flow path with the reservoir chamber and generate a damping force.

[0024] According to another aspect of the present disclosure, a shock absorber includes: a cylinder body filled with fluid; a piston rod, which is configured to be vertically movable in the cylinder body, and a piston valve is connected to the piston rod at one side of the piston rod, the piston valve is configured to divide the interior of the cylinder body into a rebound chamber and a compression chamber, and a lower gasket is fastened to the piston valve at the lower end of the piston valve; and a valve assembly, which is connected to one end of the cylinder body to change the damping force according to the stroke length of the piston rod, wherein the valve assembly includes a guide member, which is configured to be movable back and forth in the cylinder body and has a first connecting flow path formed to vertically pass through its central portion and a second connecting flow path formed to vertically pass through the guide member at a peripheral portion of the first connecting flow path; a buffer member, which is configured to be cylindrical to elastically support the lower surface of the guide member and has a plurality of side holes formed on its side surface; and a support member, which is connected to the end of the cylinder body to support the lower end of the buffer member and has a connecting hole formed to vertically pass through the support member.

[0025] The guide member may include a plurality of upper protrusions formed to protrude from an upper surface thereof and arranged to be spaced apart from each other; and a slit flow path formed between the plurality of upper protrusions.

[0026] The second connection flow path may be formed on the upper protrusion to be opened and closed by the lower gasket.

[0027] The buffer member may include a bellows portion configured to generate elastic force due to a restoring force against contraction or expansion, and a protrusion protruding from an outer surface of the bellows portion to restrict movement of the buffer member in the width direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] These and / or other aspects of the present disclosure will become apparent and more readily understood from the following description of embodiments, taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 is a cross-sectional view of a shock absorber according to an embodiment of the present disclosure;

[0030] Figure 2 is an enlarged cross-sectional view of a shock absorber according to an embodiment of the present disclosure;

[0031] Figure 3is an exploded perspective view showing a valve assembly of a shock absorber according to an embodiment of the present disclosure;

[0032] Figure 4 is a perspective view illustrating an upper surface of a guide member of a shock absorber according to an embodiment of the present disclosure;

[0033] Figure 5 is a perspective view illustrating a lower surface of a guide member of a shock absorber according to an embodiment of the present disclosure;

[0034] Figure 6 A schematic diagram illustrating the operation of a shock absorber during a compression stroke according to an embodiment of the present disclosure;

[0035] Figure 7 a schematic diagram illustrating the operation of a shock absorber during a compression stroke according to an embodiment of the present disclosure; and

[0036] Figure 8 A schematic diagram illustrating operation of a shock absorber during a compression stroke according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present disclosure to those skilled in the art. The present disclosure is not limited to the embodiments shown here, but may be embodied in other forms. The accompanying drawings are not intended to limit the scope of the present disclosure in any way, and the dimensions of components may be exaggerated for clarity of illustration.

[0038] Figure 1 is a cross-sectional view of a shock absorber according to an embodiment of the present disclosure, Figure 2 is an enlarged cross-sectional view of a shock absorber according to an embodiment of the present disclosure, Figure 3 is an exploded perspective view of a valve assembly of a shock absorber according to an embodiment of the present disclosure, Figure 4 is a perspective view illustrating an upper surface of a guide member of a shock absorber according to an embodiment of the present disclosure, and Figure 5 is a perspective view illustrating a lower surface of a guide member of a shock absorber according to an embodiment of the present disclosure.

[0039] Reference Figures 1 to 5The shock absorber 1 according to an embodiment of the present disclosure may include: a piston rod 30 configured to reciprocate within a cylinder 10 filled with fluid; a piston valve 31 mounted on the piston rod 30 to divide the interior of the cylinder 10 into a rebound chamber 11 and a compression chamber 12, and a lower gasket 32 ​​fastened to the piston valve at a lower end thereof; and a valve assembly 100 coupled to an end of the cylinder 10 to change the damping force according to the stroke length of the piston rod 30. The shock absorber 1 according to an embodiment of the present disclosure may further include: an outer tube 20 provided outside the cylinder 10 and having a reservoir chamber 21 formed therein; and a body valve 40 coupled to the lower end of the valve assembly 100 to communicate the reservoir chamber 21 and the valve assembly 100 and generate the damping force.

[0040] The cylinder 10 may be provided in a cylindrical shape with a space formed therein, and the interior of the cylinder 10 is filled with a working fluid (oil). The interior of the cylinder 10 may be partitioned into a compression chamber 12 formed on the lower side and a rebound chamber 11 formed on the upper side by a piston valve 31.

[0041] One end of the piston rod 30 is located inside the cylinder 10, and the other end extends to the outside of the cylinder 10 to be connected to the vehicle body (not shown) or the wheel side. In this case, the piston valve 31 is installed on one end of the piston rod 30.

[0042] The piston valve 31 is configured to reciprocate together with the piston rod 30 within the cylinder 10 filled with fluid while passing through the piston rod 30 and being coupled to the piston rod 30. In this case, at least one compression flow path and a rebound flow path are formed perpendicularly through the piston valve 31 so that the fluid can move through the piston valve 31 during the compression stroke or the rebound stroke. As described above, the piston valve 31 generates a damping force within the cylinder 10 due to the resistance of the fluid while the fluid flows into the compression chamber 12 or the rebound chamber 11 during the compression stroke or the rebound stroke.

[0043] An upper gasket 33 and a lower gasket 32 ​​may be mounted on upper and lower sides of the piston valve 31 , respectively, and fastened by nuts 34 to be fixed to the piston rod 30 .

[0044] An annular hole through which the piston rod 30 passes may be provided at the center of the lower washer 32. In this case, the outer diameter of the lower washer 32 may be formed to extend in the radial direction so as to be in close contact with the upper protrusion 122 during the compression stroke.

[0045] The valve assembly 100 may be coupled to the end of the cylinder 10 to generate an additional damping force according to the stroke length of the piston rod 30. Specifically, the valve assembly 100 may generate an additional damping force according to the stroke length of the piston rod 30 during the compression stroke of the piston valve 31. A detailed description of the valve assembly 100 will be provided later.

[0046] The body valve 40 can be coupled to the lower end of the valve assembly 100 to generate additional damping force. Specifically, the body valve 40 can include: a body portion 41, which is interposed between the valve assembly 100 and the valve housing 50 and has one or more flow paths formed vertically therethrough; a plurality of discs 42, which are respectively provided at the upper and lower ends of the body portion 41 to generate damping force by regulating the flow of fluid passing through the flow paths; and a fastening member 43, which is provided to fasten the plurality of discs 42 to the body portion 41.

[0047] The outer tube 20 may be provided in a cylindrical shape forming a space therein, and the inner diameter of the outer tube 20 may be larger than the inner diameter of the cylinder block 10 so as to accommodate the cylinder block 10 therein. In this case, a storage chamber 21 filled with a working fluid (oil) is formed between the inner side of the outer tube 20 and the outer side of the cylinder block 10. The storage chamber 21 is provided so as to communicate with the cylinder block 10 through the body valve 40 and the valve assembly 100.

[0048] According to an embodiment of the present disclosure, the valve assembly 100 may include a guide member 120, which is arranged to be spaced apart from the lower side of the piston valve 31 so as to be movable back and forth in the cylinder body 10 and has a connecting flow path 121 for connecting the pressurization chamber 13 and the compression chamber 12 formed on the lower side; a buffer member 130, which is arranged to be compressed in the pressurization chamber 13 to elastically support the guide member 120; and a support member 110, which is connected to the end of the cylinder body to support the lower end of the buffer member 130 and has a connecting hole 111 connected to the pressurization chamber 13.

[0049] During the compression stroke, the valve assembly 100 may additionally apply a damping force according to the stroke length of the piston rod 30. A detailed description of the operation of the valve assembly 100 will be provided later.

[0050] The valve assembly 100 may be coupled to the cylinder 10 in a state of being assembled into one component through assembly of the support member 110 , the guide member 120 , and the buffer member 130 .

[0051] One side of the support member 110 may be coupled to the end of the cylinder 10 to support the lower end of the buffer member 130 , and the other side is provided so that the body valve 40 is coupled thereto.

[0052] Specifically, the support member 110 may include: a small diameter portion 110a, which is configured to be press-fitted into the end of the cylinder body 10; and a large diameter portion 110b, which is configured to have a larger radius than the small diameter portion 110a, having a hollow lower chamber 14 formed at its lower end, and the body valve 40 is connected to the lower chamber.

[0053] The support member 110 may have a communication hole 111 formed vertically through the center thereof to allow fluid to flow in. Thus, the communication hole 111 communicates the pressurizing chamber 13 and the lower chamber 14 .

[0054] The support member 110 may be provided with a mounting groove 112 formed on the upper surface to receive and support the lower end of the buffer member 130. The mounting groove 112 may be formed by being recessed in a circumferential direction around the communication hole 111 of the support member 110 so that the lower end of the buffer member 130 is press-fitted thereto.

[0055] The guide member 120 is provided to be spaced apart from the lower side of the piston valve 31 so as to be movable forward and backward within the cylinder 10 .

[0056] The guide member 120 separates the compression chamber 12 from the pressurizing chamber 13 and includes a connecting flow path 121 for connecting the compression chamber 12 and the pressurizing chamber 13. A portion of the connecting flow path 121 is opened and closed by the rise and fall of the lower gasket 32, so that a high pressure can be formed in the pressurizing chamber 13.

[0057] The connecting flow path 121 includes a first connecting flow path 121a provided at a central portion of the guide member 120 to connect the compression chamber 12 and the pressurizing chamber 13, and a second connecting flow path 121b provided on a radially outer side of the guide member 120 to be opened and closed by the lower gasket 32. Therefore, the valve assembly 100 according to the present disclosure can change the damping force of the shock absorber 1 depending on whether the first connecting flow path 121a and the second connecting flow path 121b are opened or closed (i.e., depending on the active cross-sectional areas (or effective cross-sectional areas) of the first connecting flow path 121a and the second connecting flow path 121b).

[0058] The first connection flow path 121 a is formed in a hole shape vertically passing through a central portion of the guide member 120 so as to communicate the compression chamber 12 with the inner space (first pressurizing chamber 13 a ) of the buffer member 130 .

[0059] The second connecting flow path 121b is formed in a hole shape that vertically passes through the radially outer side of the guide member 120 to connect the compression chamber 12 with the external space (second pressurized chamber 13b) of the buffer member 130. A plurality of second connecting flow paths 121b may be arranged to be spaced apart from each other at regular intervals along the circumferential direction of the guide member 120, and may have an inlet formed on the upper protrusion 122 and an outlet formed on the lower groove 126.

[0060] Guide member 120 may include a plurality of upper protrusions 122 formed to protrude from its upper surface and spaced apart from each other, and slit flow paths 127 formed as spaces between the plurality of upper protrusions 122. Preferably, the plurality of upper protrusions 122 may be radially arranged at regular intervals. Therefore, since guide member 120 connects compression chamber 12 and pressurization chamber 13 via slit flow paths 127, the formation of negative pressure can be prevented.

[0061] The plurality of upper protrusions 122 are provided to be in close contact with the lower surface of the lower gasket 32 ​​during the compression stroke. An inlet of each of the second connection flow paths 121b may be provided on each of the upper protrusions 122.

[0062] Therefore, during the compression stroke, the lower gasket 32 ​​is in close contact with the upper protrusion 122 so that the second connecting flow path 121 b can be closed, while the first connecting flow path 121 a can communicate the compression chamber 12 and the pressurizing chamber 13 through the slit flow path 127 .

[0063] A mounting portion 125 protruding to be coupled to one end of the buffer member 130 may be provided at the lower end of the guide member 120. The outer diameter of the mounting portion 125 has a size corresponding to the inner diameter of the upper end of the buffer member 130, so that the mounting portion 125 can be press-fitted into the interior of the buffer member 130, and the first connecting flow path 121a can be formed to pass through the center of the mounting portion 125.

[0064] The guide member 120 may have a plurality of lower grooves formed to be recessed on its lower surface and arranged to be spaced apart from each other. Preferably, the plurality of lower grooves 126 may be radially arranged to be arranged at regular intervals. Each of the lower grooves 126 may be provided with an outlet of each of the second connecting flow paths 121b.

[0065] Therefore, even if the buffer member 130 is mounted on the lower end of the guide member 120 , the second connection flow path 121 b may be provided to communicate with the second pressurizing chamber 13 b through the lower groove 126 .

[0066] The guide member 120 may be provided with a coupling groove 124a formed in a ring-shaped recess on an outer circumferential surface thereof, and a sealing member 124 provided to seal a gap between the inner circumferential surface of the cylinder body 10 and the outer circumferential surface of the guide member 120 may be inserted into the coupling groove 124a.

[0067] The buffer member 130 is provided in the pressurizing chamber 13 to elastically support the guide member 120 .

[0068] One end of the bumper member 130 is inserted into the mounting portion 125 of the guide member 120, and the other end is inserted into the mounting groove 112 of the support member 110 to elastically support the guide member 120 upward with respect to the support member 110.

[0069] The bumper member 130 can be made of a plastic material having rubber properties to have elasticity, and can be made of, for example, a TPE (thermoplastic elastomer) material.

[0070] Accordingly, the shock absorber 1 according to the embodiment of the disclosure can adjust the damping force by changing the modulus of elasticity by changing the material of the bumper member 130.

[0071] The bumper member 130 is provided in a compressible cylindrical shape to divide the pressurizing chamber 13 into the inner first pressurizing chamber 13a and the outer second pressurizing chamber 13b, and is provided with a plurality of side holes 133 on a side surface thereof to communicate the first pressurizing chamber 13a and the second pressurizing chamber 13b.

[0072] The bumper member 130 can include a bellows portion 131 provided to generate an elastic force due to a restoring force against contraction or expansion, and a protrusion 132 protruding from an outer surface of the bellows portion 131 to limit movement of the bumper member 130 in a width direction. The side holes 133 can be formed at each of the protruding portions extending outward when the bellows portion 131 contracts. The positions, sizes, and numbers of the side holes 133 shown in the drawings are merely exemplary, and various modifications can be made.

[0073] Accordingly, when high pressure is formed in the second pressurizing chamber 13b during the compression stroke, the bumper member 130 can generate an additional damping force by causing the working fluid contained in the second pressurizing chamber 13b to flow to the first pressurizing chamber 13a through the plurality of side holes 133.

[0074] Accordingly, the shock absorber 1 according to the embodiment of the disclosure can adjust the damping force by changing the size, shape, and number of the side holes 133 of the bumper member 130.

[0075] Hereinafter, the operation of the shock absorber 1 according to the embodiment of the disclosure during the compression stroke will be described.

[0076] Figures 6 to 8 is a sequence illustrating the operation of the valve assembly 100 of the shock absorber 1 according to the embodiment of the disclosure during the compression stroke.

[0077] Referring to Figures 6 to 8 , the shock absorber 1 according to the embodiment of the disclosure can generate different damping forces according to the stroke length or displacement during the compression stroke.

[0078] Referring toFigure 6 During the compression stroke, when the fluid contained in the compression chamber 12 passes through the piston valve 31 and moves to the rebound chamber 11, the shock absorber 1 generates a damping force due to the resistance of the fluid. Simultaneously, during the compression stroke, a portion of the fluid contained in the compression chamber 12 passes through the body valve 40 through the valve assembly 100 and moves to the reservoir chamber 21 to be compressed, generating a damping force due to the resistance of the fluid.

[0079] At this time, since the connection flow path 121 of the valve assembly 100 is fully opened and the buffer member 130 is in a state of not being elastically deformed, almost no additional damping force is applied.

[0080] That is, in the shock absorber 1 , only the damping forces of the piston valve 31 and the body valve 40 act, and the damping force of the valve assembly 100 hardly acts.

[0081] Reference Figure 7 and Figure 8 , in the shock absorber 1 , since the lower washer 32 is in close contact with the guide member 120 by the stroke of the piston rod 30 during the compression stroke, the additional damping force of the valve assembly 100 acts.

[0082] Specifically, when the lower washer 32 presses the guide member 120 through the compression stroke, the buffer member 130 contracts due to material characteristics to generate an elastic repulsive force, thereby serving as an additional damping force.

[0083] At the same time, when the lower gasket 32 ​​is in close contact with the upper protrusion 122 while the guide member 120 is pressed through the compression stroke, the inlet of the second connecting flow path 121b is closed. Therefore, when the guide member 120 descends through the compression stroke, the second pressurized chamber 13b is in a high-pressure state, and the working fluid contained in the second pressurized chamber 13b generates resistance while flowing toward the first pressurized chamber 13a through the side hole 133, thereby acting as an additional damping force.

[0084] Therefore, the shock absorber 1 according to the embodiment of the present disclosure may generate an additional damping force when the stroke reaches an extent to which the lower washer 32 presses the guide member 120 during the compression stroke.

[0085] Therefore, the shock absorber 1 according to the embodiment of the present disclosure can achieve a stronger damping force than a conventional shock absorber by applying an additional damping force according to the stroke length during the compression stroke.

[0086] In addition, by applying additional damping force when the stroke length is greater than or equal to a certain length, the shock absorber 1 according to the embodiment of the present disclosure can improve the ride comfort of medium and large vehicles and prevent damage to components due to excessive stroke when driving in harsh road environments.

[0087] Furthermore, the shock absorber 1 according to the embodiment of the present disclosure can achieve additional damping force using a simple structure of the valve assembly 100 and is excellent in modification, thereby reducing product costs and improving commercial value.

[0088] As can be seen from the above, the shock absorber according to the embodiment of the present disclosure can prevent its length and volume from increasing excessively by applying an additional damping force during a compression stroke exceeding a certain stroke.

[0089] Furthermore, the shock absorber according to the embodiment of the present disclosure may improve the ride comfort and regulatory stability of a vehicle by applying a gradual damping force during a compression stroke exceeding a certain stroke.

[0090] The embodiments disclosed above have been described with reference to the accompanying drawings. However, it will be understood by those skilled in the art that various modifications in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims.

[0091] CROSS-REFERENCE TO RELATED APPLICATIONS

[0092] This application is based on and claims the benefit of priority from Korean Patent Application No. 10-2021-0064287 filed in the Korean Intellectual Property Office on May 18, 2021, the disclosure of which is incorporated herein in its entirety by reference.

Claims

1. A shock absorber comprising a cylinder body and a piston valve, the cylinder body being filled with fluid, the piston valve being coupled to an end of a piston rod to partition the interior of the cylinder body into a rebound chamber and a compression chamber, and a lower gasket being fastened to the piston valve at a lower end of the piston valve, the shock absorber further comprising: a guide member provided so as to be spaced apart from a lower side of the piston valve so as to be movable back and forth within the cylinder, the guide member having a connecting flow path connecting the compression chamber and a pressurizing chamber formed on a lower side; a buffer member configured to be compressible in the pressurized chamber to elastically support the guide member; as well as a support member coupled to an end portion of the cylinder to support a lower end of the buffer member, and having a communication hole communicating with the pressurizing chamber, wherein the buffer member divides the pressurized chamber into a first pressurized chamber and a second pressurized chamber, and the buffer member has a plurality of side holes for connecting the first pressurized chamber and the second pressurized chamber; The connecting flow path includes a first connecting flow path connecting the compression chamber and the first pressurizing chamber, and a second connecting flow path connecting the compression chamber and the second pressurizing chamber.

2. The shock absorber according to claim 1, wherein: The guide member includes: a plurality of upper protrusions formed to protrude from an upper surface of the guide member and arranged to be spaced apart from each other; and a plurality of lower grooves formed to be recessed on a lower surface of the guide member and arranged to be spaced apart from each other, and The second connection flow path has an inlet formed at the plurality of upper protrusions and an outlet formed at the plurality of lower grooves.

3. The shock absorber according to claim 2, wherein: The plurality of upper protrusions are arranged at regular intervals.

4. The shock absorber according to claim 1, wherein: The second connecting flow path is opened and closed by rising and falling of the lower gasket.

5. The shock absorber according to claim 1, wherein One end of the buffer member is coupled to the guide member, and the other end of the buffer member is coupled to the support member.

6. The shock absorber according to claim 5, wherein: The buffer member includes a bellows portion configured to generate elastic force due to a restoring force against contraction or expansion, and a protrusion protruding from an outer surface of the bellows portion to restrict movement of the buffer member in a width direction.

7. The shock absorber according to claim 1, wherein: A sealing member provided to seal a gap between an outer peripheral surface of the guide member and an inner peripheral surface of the cylinder is mounted on the outer peripheral surface of the guide member.

8. The shock absorber according to claim 1, further comprising: An outer tube is provided to be spaced apart from an exterior of the cylinder to form a storage chamber between the cylinder and the outer tube.

9. The shock absorber according to claim 8, further comprising: A body valve is coupled to a lower end of the support member to communicate the connecting flow path with the reservoir chamber and generate a damping force.

10. The shock absorber according to claim 1, wherein The first connecting flow path is provided in the form of a hole vertically passing through a central portion of the guide member.

11. The shock absorber according to claim 10, wherein: The second connecting flow path is provided in the form of a plurality of holes vertically penetrating the guide member and radially outside the first connecting flow path.

12. The shock absorber according to claim 1, wherein The shock absorber changes a damping force according to effective cross-sectional areas of the first connecting flow path and the second connecting flow path.

13. The shock absorber according to claim 1, wherein The guide member includes a mounting portion formed to protrude from a lower end of the guide member to be coupled with one end of the buffer member.

14. The shock absorber according to claim 13, wherein: The outer diameter of the mounting portion is set to have a size corresponding to the inner diameter of the upper end of the buffer member.

15. The shock absorber according to claim 7, wherein The guide member is provided with a coupling groove formed to be recessed in a ring shape on an outer circumferential surface thereof so that the sealing member is inserted into the coupling groove.

16. The shock absorber according to claim 9, wherein The support member includes: a small diameter portion, which is configured to be press-fitted into the end of the cylinder body; and a large diameter portion, which is configured to have a larger radius than the small diameter portion, the large diameter portion having a hollow lower chamber formed at its lower end, and the body valve is connected to the lower chamber.

17. The shock absorber according to claim 1, wherein The lower gasket is formed to extend in a radial direction.

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