Damping force control shock absorber

Abstract

The present disclosure relates to a shock absorber, and more particularly, to a damping force control shock absorber that can appropriately adjust a damping force characteristic. The damping force control shock absorber according to the present disclosure includes a cylinder formed in a double structure of an inner portion and an outer portion, having an inner space divided into a compression chamber and a rebound chamber by a piston valve, and having a reservoir chamber in an outer space, a compression electromagnetic valve installed on the cylinder, a rebound electromagnetic valve installed on the cylinder, and a check valve provided in the rebound electromagnetic valve and opening and closing a passage connecting the reservoir chamber and the rebound chamber.

Description

Technical Field

[0001] This disclosure relates to a shock absorber, and more specifically, to a damping force controlled shock absorber with adjustable damping force characteristics. Background Technology

[0002] As vehicles become more common, consumers' understanding and demands regarding them are gradually increasing. Not only are the vehicle's purpose, convenience, and economy considered important factors in consumers' vehicle purchasing decisions, but also features such as power, comfort, ride comfort, and steering stability.

[0003] During driving, a vehicle constantly receives vibrations and impacts from the road surface through its wheels. When these vibrations and impacts are fully transmitted to the vehicle body and steering wheel, ride comfort and driving stability are significantly reduced. Therefore, vehicles must be equipped with a suspension system. Shock absorbers, springs, and suspension arms are the main components of a suspension system.

[0004] A shock absorber consists of a cylinder, piston rod, piston valve, etc. The piston valve is connected to the piston rod and is located in the cylinder, and generates damping force.

[0005] Shock absorbers possess the following characteristics: when the damping force is set to a low level, the shock absorber can improve ride comfort by absorbing vibrations caused by uneven road surfaces; while when the damping force is set to a high level, it can suppress changes in vehicle body posture, thereby improving driving stability. Therefore, depending on the intended use of the vehicle, shock absorbers with different damping force characteristics are typically used selectively in the prior art.

[0006] Recently, a damping force control shock absorber has been developed. This shock absorber can be equipped with a variable damping force valve to appropriately adjust the damping force characteristics according to the road surface condition, driving conditions, etc. The variable damping force valve can appropriately adjust the damping force characteristics of the shock absorber.

[0007] For example, a damping force control shock absorber with a dual solenoid valve structure has been developed, which includes a rebound solenoid valve for adjusting the damping force during the rebound stroke and a compression solenoid valve for adjusting the damping force during the compression stroke.

[0008] The cylinder inside the shock absorber is divided into a compression chamber and a rebound chamber by a piston valve, and each of these chambers is filled with a fluid such as oil.

[0009] During the compression stroke, the piston valve compresses the fluid in the compression chamber, thereby increasing the pressure in the compression chamber and relatively decreasing the pressure in the springback chamber. During the springback stroke, the piston valve compresses the fluid in the springback chamber, thereby increasing the pressure in the springback chamber and relatively decreasing the pressure in the compression chamber.

[0010] The operating structure of a damping force control shock absorber with a dual solenoid valve structure in the prior art is described.

[0011] During the compression stroke, the fluid in the compression chamber moves to the reservoir chamber through the compression solenoid valve, and a portion of the fluid moves to the springback chamber through the bypass passage of the piston valve.

[0012] During the springback stroke, the fluid in the springback chamber moves to the reservoir chamber through the springback solenoid valve, and a portion of the fluid moves to the compression chamber through the bypass passage of the piston valve.

[0013] According to existing damping force control shock absorbers with this operating structure, during the compression stroke, when a portion of the fluid in the compression chamber is delivered to the rebound chamber through the bypass passage of the piston valve, the passage of the rebound solenoid valve connected to the reservoir chamber is opened under low pressure relative to the rebound chamber. Therefore, there is a problem that the damping force generated during the compression stroke depends on the rebound solenoid valve, thus reducing the independence of the compression solenoid valve.

[0014] On the other hand, when the amount of fluid moving to the springback chamber during the compression stroke is small, the amount of fluid in the springback chamber may become insufficient, and hysteresis may occur when the compression stroke transitions to the springback stroke. This phenomenon may depend on the type of valve used to open / close the bypass passage in the piston valve.

[0015] For example, the compression stroke can be set to a hard mode to overcome the operating characteristics. To do this, the bypass channel shut-off valve can be constructed as a jacketed type with a disk stack structure. In this case, the amount of fluid delivered is inevitably smaller compared to a shut-off valve with a lift structure.

[0016] As mentioned above, when hysteresis occurs, the damping force inevitably decreases, but there are alternative measures to prevent hysteresis in existing damping force control shock absorbers.

[0017] (Related technical documents)

[0018] (Patent Document 1) Korean Patent, Patent No.: 10-0842031 (published on June 27, 2008). Summary of the Invention

[0019] This disclosure aims to solve the problems of the prior art described above, and its purpose is to provide a damping force control shock absorber that can prevent the reduction of damping force by improving the operational independence of the compression solenoid valve and the rebound solenoid valve.

[0020] Another object of this disclosure is to provide a damping force control shock absorber that can prevent hysteresis upon entering the rebound stroke by preventing the amount of fluid in the rebound chamber from becoming insufficient during the compression stroke.

[0021] To achieve these objectives, a damping force controlled shock absorber according to a preferred embodiment of the present disclosure includes: a cylinder having a dual structure of internal and external components, having an internal space divided into a compression chamber and a rebound chamber by a piston valve, and having a reservoir in the external space; a compression solenoid valve mounted on the cylinder; a rebound solenoid valve mounted on the cylinder; and a check valve disposed in the rebound solenoid valve, which opens and closes the passage connecting the reservoir and the rebound chamber.

[0022] The damping force control shock absorber according to a preferred embodiment of the present disclosure further includes a column member mounted outside the cylinder and fixing and supporting the solenoid valve with a gap therebetween.

[0023] A connecting hole for the solenoid valve is formed in the column component.

[0024] The spring-loaded solenoid valve has a spring-loaded port connected to the spring-loaded chamber, through which fluid flows inward and outward, and a channel connecting the reservoir and the spring-loaded chamber is formed in the spring-loaded port.

[0025] The check valve is installed in the channel.

[0026] The check valve includes: a shut-off member, providing opening and closing channels; and a resilient member, providing resilient support for the shut-off member.

[0027] A check valve allows fluid to flow from the reservoir to the spring chamber and prevents fluid from flowing in the opposite direction.

[0028] The check valve opens during the compression stroke and closes during the springback stroke.

[0029] The springback solenoid valve includes: a springback valve body that forms the exterior of the valve and in which fluid in the springback chamber flows and circulates during the springback stroke; and a springback port located at the inlet of the springback valve body, and a check valve installed between the springback port and the springback valve body.

[0030] The spring-loaded port includes: a spring-loaded body, formed in the shape of a hollow tube and connected to a spring-loaded chamber at a first end; a spring-loaded flange, extending outward from a second end of the spring-loaded body and having a spring-loaded hole connected to a liquid reservoir; and an annular protrusion, which protrudes from the spring-loaded flange toward the spring-loaded valve housing, having a channel in the annular protrusion and forming a space for installing a check valve, and the channel connecting to the liquid reservoir, the spring-loaded hole, the internal space of the protrusion, the interior of the spring-loaded body, and the spring-loaded chamber.

[0031] The shut-off member of the check valve is configured to open and close the upper end of the spring-loaded orifice in the check valve mounting space, and the elastic member elastically supports the shut-off member relative to the spring-loaded valve housing in the check valve mounting space.

[0032] The fluid in the reservoir flows into the interior through the lower end of the spring orifice and pushes the stop member, causing the spring orifice to open during the compression stroke.

[0033] The stop member is an annular disk, and a mounting surface is formed on the spring-loaded flange, on which the stop member is mounted in close contact.

[0034] The elastic member includes: an annular fixing portion fixed to the rebound valve housing; a plurality of elastic support portions formed to be inclined from the annular fixing portion toward the stop member, radially formed from the center of the annular fixing portion, and elastically supporting the stop member; and a contact portion bent from the end of the elastic support member to contact the stop member.

[0035] The column component includes: a hollow first fixing member in which a compression solenoid valve is inserted and fixed; a hollow second fixing member in which a rebound solenoid valve is inserted and fixed; and a connector that connects the first and second fixing members and has a communicating hole.

[0036] The compression solenoid valve controls the damping force by controlling the flow of fluid from the compression chamber to the reservoir during the compression stroke.

[0037] During the rebound stroke, a portion of the fluid in the rebound chamber is transported to the compression chamber via the rebound solenoid valve, the column assembly, and the compression solenoid valve.

[0038] A damping force controlled shock absorber according to a preferred embodiment of the present disclosure includes: a cylinder having a dual structure of internal and external components, having an internal space divided into a compression chamber and a rebound chamber by a piston valve, and having a reservoir in the external space; a compression solenoid valve mounted on the cylinder; a rebound solenoid valve mounted on the cylinder; and a check valve disposed in the rebound solenoid valve, which opens and closes a passage connecting the reservoir and the rebound chamber, wherein, during the compression stroke, due to the opening of the check valve, a portion of the fluid in the compression chamber is transported to the reservoir through the compression solenoid valve, and a portion of the fluid in the reservoir is transported to the rebound chamber through the passage, and during the rebound stroke, a portion of the fluid in the rebound chamber is transported to the compression chamber through the rebound solenoid valve and the compression solenoid valve.

[0039] According to the damping force control shock absorber disclosed herein, the following effects can be expected.

[0040] First, during the springback stroke, the fluid discharged from the springback solenoid valve flows into the high-pressure compression chamber instead of the low-pressure reservoir, thus improving the operational independence of the compression and springback solenoid valves. Therefore, it prevents a reduction in damping force that might occur due to the coordinated operation of the solenoid valves.

[0041] Furthermore, since the fluid in the reservoir flows into the springback chamber through the check valve during the compression stroke, insufficient fluid in the springback chamber during the compression stroke can be prevented. Therefore, the reduction in damping force due to hysteresis when the compression chamber becomes the springback chamber can be prevented.

[0042] These technical features allow both soft and hard modes to be applied to the compression stroke when the rebound stroke is in soft mode, thus meeting a variety of consumer needs. In particular, even when hard mode is applied to the compression stroke to maximize handling characteristics, stable driving is possible without reducing damping force due to lag. Attached Figure Description

[0043] Figure 1 This is a diagram showing the appearance of a damping force controlled shock absorber according to a preferred embodiment of the present disclosure.

[0044] Figure 2 This is a cross-sectional view of a damping force controlled shock absorber according to a preferred embodiment of the present disclosure.

[0045] Figure 3 yes Figure 2 An enlarged cross-sectional view of a portion of the solenoid valve shown.

[0046] Figure 4 yes Figure 1 An enlarged view of a portion of the column component shown.

[0047] Figure 5 yes Figure 4 The cross-sectional view of the column component is shown.

[0048] Figure 6 yes Figure 3 The diagram shows a cross-sectional view of the compression valve housing.

[0049] Figure 7 yes Figure 3 The cross-sectional view of the compression port is shown.

[0050] Figure 8 yes Figure 3 The diagram shows a cross-sectional view of the rebound valve housing.

[0051] Figure 9 yes Figure 3 The cross-sectional view of the spring-loaded inlet is shown.

[0052] Figure 10 yes Figure 3 The diagram shows an enlarged cross-sectional view of the check valve in its installed state.

[0053] Figure 11 This is a three-dimensional diagram of the shut-off and elastic components that make up the check valve.

[0054] Figure 12It is a cross-sectional view showing the flow of fluid during the compression stroke.

[0055] Figure 13 It is a cross-sectional view showing the flow of fluid during the rebound stroke.

[0056] Figure 14 It is a cross-sectional view showing the flow of fluid through the check valve during the compression stroke.

[0057] Figure 15 This is a cross-sectional view showing the check valve in the closed state during the springback stroke.

[0058] 10: Cylinder 11: Base shell

[0059] 12: Inner tube 13: Compression chamber

[0060] 14: Rebound chamber; 15: Compression separation tube

[0061] 16: Rebound Separator 17: Liquid Storage Chamber

[0062] 20: Piston valve; 30: Piston rod

[0063] 40: Main valve; 50: Rod guide.

[0064] 60: Top cover 70: Bottom cover

[0065] 80: Compression solenoid valve 81: Compression valve housing

[0066] 82: Compression port; 90: Rebound solenoid valve

[0067] 91: Rebound valve housing; 92: Rebound port

[0068] 93: Check valve; 100: Column component

[0069] 101: First fastener; 102: Second fastener

[0070] 103: Connector Detailed Implementation

[0071] The damping force control shock absorber according to a preferred embodiment of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0072] In the attached diagram, Figure 1 This is a diagram showing the appearance of a damping force controlled shock absorber according to a preferred embodiment of the present disclosure. Figure 2 This is a cross-sectional view of a damping force controlled shock absorber according to a preferred embodiment of the present disclosure.

[0073] The damping force controlled shock absorber according to a preferred embodiment of the present disclosure includes a cylinder 10, a piston valve 20, a piston rod 30, a main valve 40, a rod guide 50, an upper cover 60, a lower cover 70, solenoid valves 80 and 90, and a column member 100.

[0074] The cylinder 100 has a dual structure, wherein an inner tube 12 is mounted in a base housing 11 with a gap between it and the base housing 11, and is filled with fluid. A piston valve 20 slides in the inner tube 12, and the internal space of the inner tube 12 is divided into a compression chamber 13 and a springback chamber 14 by the piston valve 20. Between the base housing 11 and the inner tube 12, a compression separation pipe 15 and a springback separation pipe 16 are mounted on the outer surface of the inner tube 12 with a gap between them. The compression separation pipe 15 and the springback separation pipe 16 form intermediate chambers between the inner tube 12 and the compression separation pipe 15 and the springback separation pipe 16, respectively connected to the compression chamber 13 and the springback chamber 14.

[0075] A compression chamber 13 is formed in the lower part of the cylinder 10, and a springback chamber 14 is formed in the upper part of the cylinder 10. Correspondingly, a compression separation pipe 15 is installed in the lower part of the inner tube 12, and a springback separation pipe 16 is installed in the upper part of the inner tube 12. Connection holes 12a and 12b, which connect the intermediate chamber to the compression chamber 13 and the springback chamber 14 respectively, are formed in the lower and upper parts of the inner tube 12.

[0076] In addition to the intermediate chamber, a liquid storage chamber 17, which compensates for the changes in the internal volume of the compression chamber 13 and the rebound chamber 14 during the reciprocating motion of the piston valve 20, is also formed in the space between the base shell 11 and the inner tube 12.

[0077] As the piston valve 20 reciprocates within the internal space of the inner tube 12, it compresses the fluid in the compression chamber 13 and the springback chamber 14. A bypass passage is formed in the piston valve 20 to allow fluid to flow between the compression chamber 13 and the springback chamber 14 during the compression and springback strokes, and a shut-off valve is provided in this bypass passage.

[0078] The piston rod 30 slidably passes through the rod guide 50 at the upper end of the closing cylinder 10. The piston valve 20 is mounted at the lower end of the piston rod 30, and the upper end of the piston rod 30 is fixed to the vehicle body.

[0079] The main valve 40 is installed at the lower end of the inner tube 12 and separates the compression chamber 13 and the liquid storage chamber 17. A channel is formed in the main valve 40 to allow fluid to flow between the two chambers 13 and 17.

[0080] The rod guide 50 closes the upper end of the cylinder 10, and the guide hole that guides the up and down movement of the piston rod 30 is formed to pass through the center of the rod guide 50.

[0081] On the other hand, an upper cover 60 and a lower cover 70, which respectively cover the upper and lower ends of the cylinder 10, are respectively installed at the lower and upper ends of the cylinder 10. The upper cover 60 is installed on the outside of the upper end of the base housing 11 in the form of surrounding the upper end of the base housing 11, and the lower cover 70 is installed on the inside of the lower end of the base housing 11 in the form of surrounding the main valve 40.

[0082] Solenoid valves 80 and 90, mounted on cylinder 10 via column member 100, consist of a compression solenoid valve 80 that variably controls the damping force during the compression stroke and a rebound solenoid valve 90 that variably controls the damping force during the rebound stroke.

[0083] The column member 100 is mounted on the outside of the cylinder 10 to fix and support the solenoid valves 80 and 90, and there is a gap between the column member 100 and the solenoid valves 80 and 90.

[0084] In the attached diagram, Figure 3 yes Figure 2 An enlarged cross-sectional view of a portion of the solenoid valve shown. Figure 4 yes Figure 1 An enlarged view of the column components shown. Figure 5 yes Figure 4 The cross-sectional view of the column component shown. Figure 6 yes Figure 3 The cross-sectional view of the compression valve housing shown is shown. Figure 7 yes Figure 3 The cross-sectional view of the compression port shown is shown. Figure 8 yes Figure 3 The cross-sectional view of the rebound valve housing shown is shown. Figure 9 yes Figure 3 The cross-sectional view of the spring-loaded inlet shown is shown. Figure 10 yes Figure 3 The diagram shows an enlarged cross-sectional view of the check valve in its installed state.

[0085] This article first describes the column component 100, and then describes the solenoid valves 80 and 90 and the check valve 93, which will be described below.

[0086] The column component 100 includes: a hollow first fixing member 101, into which a compression solenoid valve 80 is inserted and fixed; a hollow second fixing member 102, spaced apart from the first fixing member 101, into which a rebound solenoid valve 90 is inserted and fixed; and a connecting member 103, connecting the first fixing member 101 and the second fixing member 102. A connecting hole 103a is formed in the connecting member 103, which directly connects the compression solenoid valve 80 and the rebound solenoid valve 90 through the internal space connecting the first fixing member 101 and the second fixing member 102.

[0087] A first receiving space 101a into which the compression solenoid valve 80 is inserted and fixed is formed in the first fixing member 101. The compression port 82 of the compression solenoid valve 80, which will be described below, is connected to the compression separation tube 15 through the lower end of the first fixing member 102.

[0088] The second receiving space 102a into which the spring-loaded solenoid valve 90 is inserted and fixed is formed in the second fixing member 102. The spring-loaded port 92 of the spring-loaded solenoid valve 90, which will be described below, is connected to the spring-loaded separation tube 16 through the lower end of the second fixing member 102.

[0089] The connecting hole 103a formed in the connector 103 includes one or more connecting holes to allow fluid discharged from the spring-loaded solenoid valve 90 to be adequately guided to the compression solenoid valve 80. The connecting hole 103a is formed parallel to the central axis of the bypass housing 11.

[0090] The compression solenoid valve 80 includes a compression valve housing 81 and a compression port 82. The compression valve housing 81 forms the exterior of the valve and is inserted into and fixed in the first fixing member 101 of the column member 100. When fluid flows through the compression valve housing 81, the damping force is variably controlled by adjusting the current applied to the valve. The compression port 82, located at the inlet of the compression valve housing 81 and through which fluid flows inward and outward, is inserted into and fixed in the first fixing member 101 of the column member 100.

[0091] During the compression stroke, a portion of the fluid in the compression chamber 13 is guided through the compression port 82 to the compression valve housing 81, and after circulating in the compression solenoid valve 80, it is discharged into the reservoir 17. The compression solenoid valve 80 has an anti-backflow structure to prevent fluid from flowing back into the compression chamber 13 during this process.

[0092] A first compression port 81a for discharging fluid circulating in the compression solenoid valve 80 toward the reservoir 17 is formed on one side of the compression valve housing 81.

[0093] The compression port 82 includes a hollow compression body 821 connected at its first end to the compression separation tube 15, and a compression flange 822 extending outward from the second end of the compression body 822 in a direction perpendicular to the center line of the compression body 821.

[0094] The second end of the compression body 821 is in close contact with the compression valve housing 81 in a surface contact manner. Therefore, during the compression stroke, the fluid flowing into the interior through the first end of the compression body 821 can be guided into the compression valve housing 81 without leaking to the outside.

[0095] A plurality of second compression holes 822a for guiding fluid circulating in the compression solenoid valve 80 to the reservoir 17 are formed parallel to and around the central hole in the compression body 821.

[0096] A plurality of third compression holes 822b connected to the column member 100 are formed in the compression flange 822 to communicate perpendicularly with the central hole in the compression body 821.

[0097] The second compression hole 822a and the third compression hole 823b are spaced apart from each other and are not connected. The third compression hole 822b is formed between the second compression holes 821a.

[0098] The spring-loaded solenoid valve 90 includes a spring-loaded valve housing 91, a spring-loaded port 92, and a check valve 93. The spring-loaded valve housing 91 forms the exterior of the valve and is inserted into and fixed in the second fixing member 102 of the column member 102. When fluid flows through the spring-loaded valve housing 91, the damping force is variably controlled by adjusting the current applied to the valve. The spring-loaded port 92, located at the inlet of the spring-loaded valve housing 91 and through which fluid flows inward and outward, is inserted into and fixed in the second fixing member 102 of the column member 100. The check valve 93 is installed between the spring-loaded valve housing 91 and the spring-loaded port 92.

[0099] During the rebound stroke, a portion of the fluid in the rebound chamber 14 flows into the interior through the rebound port 92, is guided to the rebound valve housing 92, and then circulates in the rebound solenoid valve 90 before being discharged. The rebound solenoid valve 90 has an anti-backflow structure to prevent fluid from flowing back into the rebound chamber 14 during this process.

[0100] Multiple first rebound holes 91a for discharging fluid that has passed through the rebound solenoid valve 90 are formed in one side of the rebound valve housing 91. The fluid discharged through the first rebound holes 91a flows between the rebound valve housing 91 and the inner surface of the second fixing member 102 constituting the column member 100 and is conveyed to the communication hole 103a of the connector 103.

[0101] The spring-loaded port 92 has: a hollow spring-loaded body 921 connected to the first end of the separator tube 16; a spring-loaded flange 922 extending outward from the second end of the spring-loaded body 911 in a direction perpendicular to the centerline of the spring-loaded body 921; and an annular protrusion 923 protruding from the surface of the spring-loaded flange 922 that is in close contact with the spring-loaded valve housing 91 toward the spring-loaded valve housing 91. The fluid movement passage and installation space of the check valve 93 are formed in the protrusion 923.

[0102] A plurality of second rebound holes 922a, which are interconnected by the internal space 923a formed by the protrusion 923 and the liquid storage chamber 17, are formed in the rebound flange 922. The second rebound holes 922a are formed parallel to and around the central hole of the rebound body 921.

[0103] During the compression stroke, check valve 93 opens / closes its passage, allowing a portion of the fluid in reservoir 17 to flow into springback chamber 14 via springback solenoid valve 90. Check valve 93 opens only during the compression stroke and closes during the springback stroke.

[0104] The fluid is connected to the liquid storage chamber 17, the second rebound hole 922a of the rebound flange 922, the internal space 923a surrounded by the protrusion 923, the central hole of the rebound body 921, the intermediate chamber formed by the rebound separation tube 16, and the rebound chamber 14 through the flow channel of the check valve 93.

[0105] The check valve 93 includes a shut-off member 931 that opens / closes a passage, and an elastic member 932 that elastically supports the shut-off member 931. The shut-off member 931 opens / closes the upper end of the second spring-loaded hole 922a in the internal space 932a surrounded by the protrusion 923. The elastic member 933 is disposed in the internal space 923a between the shut-off member 933 and the spring-loaded valve housing 91, and elastically supports the shut-off member 931 relative to the spring-loaded valve housing 91.

[0106] In the attached diagram, Figure 11 This is a three-dimensional diagram of the shut-off and elastic components that make up the check valve.

[0107] The stop member 931 is an annular disc disposed within the internal space 932a of the protrusion 923 constituting the spring-loaded opening 92. A mounting surface is formed on the spring-loaded flange 922, and the stop member 931 is mounted on this mounting surface in close contact. The stop member 931 opens / closes the upper end of the second spring-loaded hole 922a within the internal space 922a of the protrusion 923. The stop member 931 is operated in a raised configuration, in which, when the stop member 931 is opened, the stop member 931 is raised from the upper end of the second spring-loaded hole 922a (i.e., the mounting surface of the spring-loaded flange 922).

[0108] The elastic member 932 includes: an annular fixing portion 932a, fixed to the rebound valve housing 91; a plurality of elastic support portions 932b, formed to be inclined from the fixing member 931a toward the stop member 931, radially formed from the center of the fixing portion 932a, and elastically supporting the stop member 931; and a contact portion 932c, bent from the end of the elastic support portion 932b to contact the surface of the stop member 931.

[0109] On the other hand, during the rebound stroke, the fluid flowing into the rebound chamber 14 through the rebound port 92 is delivered to the rebound valve housing 91 after passing between multiple elastic supports 932b. During this process, the check valve 93 remains closed and does not open.

[0110] In the attached diagram, Figure 12It is a cross-sectional view showing the flow of fluid during the compression stroke.

[0111] As shown in the figure, during the downward stroke of the piston valve 20, i.e., during the compression stroke, the fluid in the compression chamber 13 is compressed. Therefore, the interior of the compression chamber 13 becomes a high-pressure state, and the interior of the springback chamber 14 becomes a low-pressure state.

[0112] When the piston valve 20 moves downward, a portion of the fluid in the compression chamber 13 flows into the springback chamber 14 through the bypass passage formed in the piston valve 20, thereby generating a damping force.

[0113] Furthermore, a portion of the fluid in the compression chamber 13 is conveyed through the connecting hole 12a formed at the lower part of the inner tube 12 to the intermediate chamber in the compression separation tube 15, and then guided to the compression solenoid valve 80 through the compression port 82, where it circulates. As the fluid circulates in the compression solenoid valve 80, the damping force is variably controlled by changing the current applied to the compression solenoid valve 80.

[0114] The fluid that has passed through the compression solenoid valve 80 is discharged into the liquid storage chamber 17 through the first compression port 81a of the compression valve housing 81 and the second compression port 822a of the compression port 82.

[0115] In the attached diagram, Figure 13 It is a cross-sectional view showing the flow of fluid during the rebound stroke.

[0116] As shown in the figure, during the upward stroke of the piston valve 20, i.e., during the rebound stroke, the fluid in the compression chamber 14 is compressed. Therefore, the interior of the rebound chamber 14 becomes a high-pressure state, and the interior of the compression chamber 13 becomes a low-pressure state.

[0117] When the piston valve 20 moves upward, a portion of the fluid in the springback chamber 14 flows into the compression chamber 13 through a bypass passage formed in the piston valve 20, thereby generating a damping force.

[0118] Furthermore, a portion of the fluid in the rebound chamber 14 is conveyed through the connecting hole 12b formed on the upper part of the inner tube 12 to the intermediate chamber in the rebound separation tube 16, and then guided through the rebound port 92 to the rebound solenoid valve 90 and circulates in the rebound solenoid valve 90. As the fluid circulates in the rebound solenoid valve 90, the damping force is variably controlled by changing the current applied to the rebound solenoid valve 90.

[0119] The fluid that has passed through the rebound solenoid valve 90 flows through the first rebound hole 91a of the rebound valve housing 91, between the rebound valve housing 91 and the column member 100, the connecting hole 103a of the connector 103, the third compression hole 822b of the compression port 82, and the compression port 82, and then flows into the compression chamber 13.

[0120] In the attached diagram, Figure 14 It is a cross-sectional view showing the flow of fluid through the check valve during the compression stroke, and Figure 15 This is a cross-sectional view showing the check valve in the closed state during the springback stroke.

[0121] As described above, when the piston valve 20 moves downward during the compression stroke, the fluid in the compression chamber 13 is compressed, the pressure inside the compression chamber 13 increases, and a portion of the fluid in the compression chamber 13 flows into the springback chamber 14 through the bypass passage formed in the piston valve 20, thereby generating a damping force.

[0122] During the compression stroke, if the fluid in the springback chamber 14 is insufficient, hysteresis may occur when the compression stroke transitions to the springback stroke. Therefore, according to the damping force control shock absorber of this disclosure, in order to prevent hysteresis, during the compression stroke, the fluid in the reservoir 17 is delivered to the springback chamber 14 through the springback solenoid valve 90.

[0123] During the compression stroke, when the high-pressure fluid in the compression chamber 13 flows into the reservoir chamber 17 through the compression solenoid valve 80, the fluid pressure in the reservoir chamber 17 also increases. As described above, the pressure in the rebound chamber 14 decreases during the compression stroke.

[0124] Therefore, in the compression stroke, such as Figure 14 As shown, a portion of the fluid in the reservoir 17 flows into the interior through the lower end of the second spring-loaded hole 922a formed in the spring-loaded flange 922, and flows into the internal space 923a of the protrusion 923 while pushing the stop member 931 upward. That is, during the compression stroke, the pressure of the fluid flowing into the interior through the second spring-loaded hole 922a is greater than the squeezing force of the elastic member 932 of the check valve 93, so the check valve 93 is opened.

[0125] Fluid flowing in the internal space 923a of the protrusion 923 flows into the rebound chamber 14 through the central hole of the rebound body 921, the intermediate chamber formed by the rebound separation tube 16, and the connecting hole 12b formed on the upper part of the inner tube 12.

[0126] On the other hand, as described above, during the rebound stroke, the pressure inside the rebound chamber 14 increases, while the pressure inside the compression chamber 13 decreases. Therefore, the internal space of the rebound port 92 connected to the rebound chamber 14 also increases.

[0127] Therefore, as Figure 15 As shown, due to the increase in fluid pressure in the rebound chamber 14 and the relative decrease in fluid pressure in the reservoir chamber 17 during the rebound stroke, the shut-off member 931 closes the upper end of the second rebound hole 922a when squeezed by the compressive force of the elastic member 932. Therefore, fluid is prevented from flowing from the reservoir chamber 17 into the rebound port 92.

[0128] Although a preferred embodiment of a damping force control shock absorber according to the present disclosure has been described above with reference to the accompanying drawings, the present disclosure is not limited to the above embodiment, but can be modified in various ways within the scope of the claims.

Claims

1. A damping force controlled shock absorber, comprising: The cylinder is formed as a dual structure with internal and external components. It has an internal space divided into a compression chamber and a rebound chamber by a piston valve, and a liquid reservoir in the external space. A compression solenoid valve is installed on the cylinder; A springback solenoid valve is installed on the cylinder; as well as A check valve is installed in the spring-loaded solenoid valve and opens and closes the channel connecting the liquid storage chamber and the spring-loaded chamber. The spring-loaded solenoid valve includes: The rebound valve housing forms the exterior of the valve, and the fluid in the rebound chamber flows and circulates within the rebound valve housing during the rebound stroke; and A spring-loaded inlet is located at the inlet of the spring-loaded valve housing, and The check valve is installed between the rebound valve housing and the rebound port. The spring return port includes: A rebound body having a hole and connected at a first end to the rebound chamber; A spring-loaded flange extends outward from the second end of the spring-loaded body and has a spring-loaded hole connected to the liquid reservoir; and An annular protrusion extends from the spring-loaded flange toward the spring-loaded valve housing, the annular protrusion having a channel and forming a space for installing the check valve. The damping force control shock absorber further includes a column component, which is mounted outside the cylinder. A connecting hole for the compression solenoid valve and the rebound solenoid valve is formed in the column member. The fluid passing through the rebound solenoid valve flows through the rebound valve housing, the connecting hole of the connector, and then into the compression chamber.

2. The damping force controlled shock absorber according to claim 1, wherein the column component fixes and supports the compression solenoid valve and the rebound solenoid valve and there is a gap between the compression solenoid valve and the rebound solenoid valve.

3. The damping force controlled shock absorber according to claim 1, wherein, The spring-loaded solenoid valve has a spring-loaded port connected to the spring-loaded chamber, through which fluid flows inward and outward, and a channel connecting the reservoir and the spring-loaded chamber is formed in the spring-loaded port.

4. The damping force controlled shock absorber according to claim 3, wherein, The check valve is installed in the channel.

5. The damping force controlled shock absorber according to claim 4, wherein, The check valve includes: The stop component opens and closes the channel; and An elastic member that elastically supports the stop member.

6. The damping force controlled shock absorber according to claim 5, wherein, The check valve allows fluid to flow from the reservoir to the rebound chamber and prevents fluid from flowing in the opposite direction.

7. The damping force controlled shock absorber according to claim 6, wherein, The check valve opens during the compression stroke and closes during the rebound stroke.

8. The damping force controlled shock absorber according to claim 1, wherein, The channel connects to the liquid storage chamber, the rebound hole, the internal space of the protrusion, the interior of the rebound body, and the rebound chamber.

9. The damping force controlled shock absorber according to claim 8, wherein, The shut-off member of the check valve is configured to open and close the upper end of the spring-loaded orifice in the check valve mounting space, and the elastic member elastically supports the shut-off member relative to the spring-loaded valve housing in the check valve mounting space.

10. The damping force controlled shock absorber according to claim 9, wherein, The fluid in the reservoir flows into the interior through the lower end of the rebound hole and pushes the stop member, causing the rebound hole to open during the compression stroke.

11. The damping force controlled shock absorber according to claim 10, wherein, The stop member is an annular disk, and a mounting surface is formed on the spring-loaded flange, wherein the stop member is mounted on the mounting surface in close contact.

12. The damping force controlled shock absorber according to claim 11, wherein, The elastic member includes: An annular fixing part is fixed to the spring valve housing; Multiple elastic support portions are formed to be inclined from the annular fixing portion toward the stop member, radially formed from the center of the annular fixing portion, and elastically support the stop member; and The contact portion bends from the ends of the plurality of elastic supports to contact the stop member.

13. The damping force controlled shock absorber according to claim 1, wherein, The column components include: A hollow first fixing member, in which the compression solenoid valve is inserted and fixed; A hollow second fixing member, in which the spring-loaded solenoid valve is inserted and fixed; and A connector that connects the first fixing member and the second fixing member and has a communicating hole.

14. The damping force controlled shock absorber according to claim 1, wherein, The compression solenoid valve controls the damping force by controlling the flow of fluid delivered from the compression chamber to the reservoir during the compression stroke.

15. The damping force controlled shock absorber according to claim 1, wherein, During the rebound stroke, a portion of the fluid in the rebound chamber is transported to the compression chamber via the rebound solenoid valve, the column member, and the compression solenoid valve.

16. A damping force controlled shock absorber, comprising: The cylinder is formed as a dual structure with internal and external components. It has an internal space divided into a compression chamber and a rebound chamber by a piston valve, and a liquid reservoir in the external space. A compression solenoid valve is installed on the cylinder; A springback solenoid valve is installed on the cylinder; as well as A check valve is installed in the spring-loaded solenoid valve and opens and closes the channel connecting the liquid storage chamber and the spring-loaded chamber. During the compression stroke, due to the opening of the check valve, a portion of the fluid in the compression chamber is transported to the reservoir chamber via the compression solenoid valve, and a portion of the fluid in the reservoir chamber is transported to the rebound chamber via the channel. During the rebound stroke, a portion of the fluid in the rebound chamber is transported to the compression chamber via the rebound solenoid valve and the compression solenoid valve. The spring-loaded solenoid valve includes: The rebound valve housing forms the exterior of the valve, and the fluid in the rebound chamber flows and circulates within the rebound valve housing during the rebound stroke; and A spring-loaded inlet is located at the inlet of the spring-loaded valve housing, and The check valve is installed between the rebound valve housing and the rebound port. The spring return port includes: A rebound body having a hole and connected at a first end to the rebound chamber; A spring-loaded flange extends outward from the second end of the spring-loaded body and has a spring-loaded hole connected to the liquid reservoir; and An annular protrusion extends from the spring-loaded flange toward the spring-loaded valve housing, the annular protrusion having a channel and forming a space for installing the check valve. The damping force control shock absorber further includes a column component, which is mounted outside the cylinder. A connecting hole for the compression solenoid valve and the rebound solenoid valve is formed in the column member. The fluid passing through the rebound solenoid valve flows through the rebound valve housing, the connecting hole of the connector, and then into the compression chamber.

17. The damping force controlled shock absorber according to claim 16, wherein, The check valve opens during the compression stroke and closes during the rebound stroke.

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