Shock absorber

Abstract

The utility model provides a shock absorber. The shock absorber comprises an inner cylinder, a middle cylinder and an outer cylinder which are sequentially arranged from inside to outside in a sleeving mode. The inner cylinder is provided with a movable piston assembly, and the inner cylinder is provided with a through hole so that the inner cylinder can be communicated with the middle cylinder; a first adjusting valve is arranged between the middle cylinder and the outer cylinder to communicate or close an oil way between the outer cylinder and the middle cylinder, and a second adjusting valve is arranged between the outer cylinder and the inner cylinder to communicate or close an oil way between the outer cylinder and the inner cylinder. A first sealing assembly is arranged between the end of the middle cylinder and the inner cylinder, the first sealing assembly is arranged around the periphery of the inner cylinder and comprises a first sealing piece and a second sealing piece, the first sealing piece is close to an inner cavity of the middle cylinder, and the second sealing piece is located on the side, away from the inner cavity of the middle cylinder, of the first sealing piece. The hardness of the second sealing piece is larger than that of the first sealing piece. The sealing performance of the middle cylinder is improved, the oil pressure adjusting effect of the first adjusting valve is improved, and then the damping effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of shock absorbers, and in particular to a shock absorber. Background Art

[0002] In the automobile suspension system, since the elastic elements (such as shock-absorbing springs) will also have reciprocating motion when filtering road vibrations, in order to improve the smoothness of the car's driving, shock absorbers are usually installed in the suspension system to suppress the shock when the spring rebounds after absorbing the shock.

[0003] At present, the shock absorbers used in automobile suspension systems are mostly hydraulic cylinder shock absorbers. The working principle of this hydraulic cylinder shock absorber is that when relative movement occurs between the frame and the axle due to vibration, the piston rod in the shock absorber moves up and down, and the oil in the shock absorber cavity repeatedly flows from one cavity to another, thereby converting the kinetic energy generated by the relative movement between the shock absorber piston rod assembly and the shock absorber cylinder assembly into heat energy of the oil and dissipating it outward to play a damping role.

[0004] The shock absorber of the prior art is composed of an outer cylinder, an inner cylinder and an intermediate cylinder, and the oil repeatedly flows in the outer cylinder, the inner cylinder and the intermediate cylinder. However, the sealing of the existing shock absorber is poor, which causes the oil to be unable to flow in the connected chambers along the preset channel, resulting in poor adjustment effect of the regulating valve and the shock absorption effect needs to be improved. Utility Model Content

[0005] In order to overcome the defects of the above-mentioned prior art, the present application provides a shock absorber, and the specific technical solution is as follows:

[0006] A shock absorber comprises an inner cylinder, a middle cylinder and an outer cylinder which are sequentially sleeved from the inside to the outside;

[0007] The inner cylinder is provided with a movable piston assembly, and the inner cylinder is provided with a through hole to connect the inner cylinder with the middle cylinder; a first regulating valve is provided between the middle cylinder and the outer cylinder to connect or close the oil path between the outer cylinder and the middle cylinder, and a second regulating valve is provided between the outer cylinder and the inner cylinder to connect or close the oil path between the outer cylinder and the inner cylinder;

[0008] Among them, a first sealing assembly is arranged between the end of the middle cylinder and the inner cylinder, and the first sealing assembly is arranged around the outer circumference of the inner cylinder. The first sealing assembly includes a first seal and a second seal. The first seal is close to the inner cavity of the middle cylinder, and the second seal is located on the side of the first seal away from the inner cavity of the middle cylinder. The hardness of the second seal is greater than that of the first seal.

[0009] In a specific embodiment, the cross-section of the first sealing member is circular or elliptical;

[0010] And / or, the cross section of the second sealing member is square.

[0011] In a specific embodiment, the first regulating valve includes a valve seat, a valve core and a knob, the valve seat is provided with an accommodating cavity and a first channel and a second channel communicating with the accommodating cavity, the first channel is communicated with the middle cylinder, the second channel is communicated with the outer cylinder, the valve core is located in the accommodating cavity, a second sealing component is provided between the valve core and the side wall of the accommodating cavity, and the second sealing component is arranged around the outer circumference of the valve core;

[0012] The knob is configured to drive the valve core forward so that the valve core blocks the first channel and to drive the valve core backward so that the first channel and the accommodating chamber are connected; and / or the knob is configured to drive the valve core forward so that the valve core blocks the second channel and to drive the valve core backward so that the second channel and the accommodating chamber are connected.

[0013] In a specific embodiment, an annular groove is provided on the valve core, the second sealing component is located in the annular groove, and the difference between the outer diameter of the second sealing component and the inner diameter of the second sealing component is greater than the depth of the annular groove.

[0014] In a specific embodiment, the second sealing assembly includes a third sealing member and a fourth sealing member, and the third sealing member and the fourth sealing member are both located in the annular groove;

[0015] Alternatively, the second sealing assembly includes a third sealing member and a fourth sealing member, the annular groove includes a first annular groove and a second annular groove, the third sealing member is located in the first annular groove, and the fourth sealing member is located in the second annular groove.

[0016] In a specific embodiment, the third seal is close to the first channel and / or the second channel, the fourth seal is located on the side of the third seal away from the first channel and / or the second channel, and the hardness of the fourth seal is greater than that of the third seal.

[0017] In a specific embodiment, the cross-section of the third sealing member is circular or elliptical;

[0018] And / or, the cross section of the fourth sealing member is square.

[0019] In a specific embodiment, the valve core has a first columnar portion, and the outer diameter of the first columnar portion is equal to the inner diameter of the first channel;

[0020] And / or, the valve core has a second columnar portion, and the outer diameter of the second columnar portion is equal to the inner diameter of the second channel;

[0021] and / or, the axis of the first channel is perpendicular to the axis of the second channel;

[0022] And / or, the valve core is made of copper material.

[0023] In a specific embodiment, the knob is disposed at an end of the valve seat away from the outer cylinder, and the knob extends from the end of the valve seat to the side of the valve seat, and a fifth sealing member is disposed between the side of the valve seat and the knob.

[0024] In a specific embodiment, a first sealing component is disposed between the head end of the intermediate cylinder and the inner cylinder, and a first sealing component is also disposed between the tail end of the intermediate cylinder and the inner cylinder.

[0025] This application has at least the following beneficial effects:

[0026] The present application provides a shock absorber, comprising an inner cylinder, an intermediate cylinder and an outer cylinder which are sequentially arranged from the inside to the outside; the inner cylinder is provided with a movable piston assembly, and the inner cylinder is provided with a through hole to connect the inner cylinder with the intermediate cylinder; a first regulating valve is provided between the intermediate cylinder and the outer cylinder to connect or close the oil path between the outer cylinder and the intermediate cylinder, and a second regulating valve is provided between the outer cylinder and the inner cylinder to connect or close the oil path between the outer cylinder and the inner cylinder; wherein a first sealing assembly is provided between the end of the intermediate cylinder and the inner cylinder, the first sealing assembly is arranged around the outer circumference of the inner cylinder, the first sealing assembly comprises a first seal and a second seal, the first seal is close to the inner cavity of the intermediate cylinder, and the second seal is located on the side of the first seal away from the inner cavity of the intermediate cylinder, and the hardness of the second seal is greater than the hardness of the first seal.

[0027] The present application increases the sealing performance of the middle cylinder by setting a first sealing assembly, so that the oil will not leak into the outer cylinder through the end of the middle cylinder. The oil can only flow between the middle cylinder and the outer cylinder through the first regulating valve, which helps to improve the effect of the first regulating valve in regulating the oil pressure, thereby improving the shock absorption effect.

[0028] At the same time, the present application sets up double seals (a first seal and a second seal), and the hardness of the first seal close to the inner cavity of the middle cylinder is lower, while the hardness of the second seal far from the inner cavity of the middle cylinder is higher. Therefore, when the oil pressure is high and the end of the middle cylinder and the outer wall of the inner cylinder cannot be sealed and connected by the first seal, they can still be sealed and connected by the second seal, thereby further improving the sealing effect of the middle cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 The overall structural cross-section diagram of the shock absorber provided in this embodiment is as follows: Figure 1 ;

[0031] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0032] Figure 3 for Figure 1 A partial enlargement of area B in the middle Figure 1 ;

[0033] Figure 4 for Figure 1 A partial enlargement of area B in the middle Figure 2 ;

[0034] Figure 5 The overall structural cross-section diagram of the valve core provided in this embodiment is as follows: Figure 1 ;

[0035] Figure 6 The overall structural cross-section diagram of the shock absorber provided in this embodiment is as follows: Figure 2 ;

[0036] Figure 7 for Figure 6 A partial enlargement of area B in the middle Figure 2 ;

[0037] Figure 8 The overall structural cross-section diagram of the valve core provided in this embodiment is as follows: Figure 2 .

[0038] Reference numerals:

[0039] 1-outer cylinder; 2-inner cylinder; 3-middle cylinder; 4-piston assembly; 5-first regulating valve; 6-second regulating valve; 7-first sealing assembly; 8-second sealing assembly; 21-through hole; 51-valve seat; 52-valve core; 53-knob; 54-adapter seat; 55-fastening screw; 56-gasket; 57-fifth sealing member; 58-sixth sealing member; 59-seventh sealing member; 71-first sealing member; 72-second sealing member; 81-third sealing member; 82-fourth sealing member; 511-first channel; 512-second channel; 513-accommodating chamber; 514-retaining ring; 515-elastic member; 516-ball; 517-first valve seat; 518-second valve seat; 521-first columnar portion; 522-second columnar portion; 523-annular groove; 5231-first annular groove; 5232-second annular groove. DETAILED DESCRIPTION

[0040] Hereinafter, various embodiments of the present application will be described more fully. The present application may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present application to the specific embodiments disclosed herein, but the present application should be understood to cover all adjustments, equivalents and / or alternatives within the spirit and scope of the various embodiments of the present application.

[0041] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of a disclosed function, operation, or element, and does not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present application, the terms "include", "have", and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components, or a combination of the foregoing or the possibility of adding one or more features, numbers, steps, operations, elements, components, or a combination of the foregoing.

[0042] In various embodiments of the present application, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0043] The expressions (such as "first", "second", etc.) used in the various embodiments of the present application may modify the various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present application, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0044] It should be noted that in this application, unless otherwise clearly specified and defined, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the present application, a person of ordinary skill in the art should understand that the terms indicating orientation or positional relationship herein are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] The terms used in the various embodiments of the application are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meanings commonly understood by ordinary technicians in the field of the various embodiments of the application. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the application.

[0047] like Figure 1 and Figure 2 As shown, this embodiment provides a shock absorber, comprising an inner cylinder 2, a middle cylinder 3 and an outer cylinder 1 which are sequentially sleeved from the inside to the outside;

[0048] The inner cylinder 2 is provided with a movable piston assembly 4, and the inner cylinder 2 is provided with a through hole 21 to connect the inner cylinder 2 with the middle cylinder 3; a first regulating valve 5 is provided between the middle cylinder 3 and the outer cylinder 1 to connect or close the oil path between the outer cylinder 1 and the middle cylinder 3, and a second regulating valve 6 is provided between the outer cylinder 1 and the inner cylinder 2 to connect or close the oil path between the outer cylinder 1 and the inner cylinder 2;

[0049] Among them, a first sealing component 5 is arranged between the end of the middle cylinder 3 and the inner cylinder 2, and the first sealing component 7 is arranged around the outer periphery of the inner cylinder 2. The first sealing component 7 includes a first sealing member 71 and a second sealing member 72. The first sealing member 71 is close to the inner cavity of the middle cylinder 3, and the second sealing member 72 is located on the side of the first sealing member 71 away from the inner cavity of the middle cylinder 3. The hardness of the second sealing member 72 is greater than that of the first sealing member 71.

[0050] In this embodiment, the sealing performance of the middle cylinder 3 is increased by providing the first sealing assembly 7, so that the oil will not leak into the outer cylinder 1 through the end of the middle cylinder 3. The oil can only flow between the middle cylinder 3 and the outer cylinder 1 through the first regulating valve 5, which helps to improve the effect of the first regulating valve 5 in regulating the oil pressure, thereby improving the shock absorption effect.

[0051] At the same time, this embodiment sets up double seals (a first seal 71 and a second seal 72), and the hardness of the first seal 71 close to the inner cavity of the middle cylinder 3 is lower, and the hardness of the second seal 72 far from the inner cavity of the middle cylinder 3 is higher. When the oil pressure is large and the end of the middle cylinder 3 and the outer wall of the inner cylinder 2 cannot be sealed and connected by the first seal 71, they can also be sealed and connected by the second seal 72, thereby further improving the sealing effect of the middle cylinder 3.

[0052] like Figure 1 and Figure 2 As shown, in one embodiment, an annular mounting groove is provided between the inner wall at the end of the middle cylinder 3 and the outer wall of the inner cylinder 2, and the first sealing member 71 and the second sealing member 72 are both located in the annular mounting groove.

[0053] In another embodiment, a first sub-annular mounting groove may be provided on the inner wall at the end of the middle cylinder 3, and a second sub-annular mounting groove may be provided on the outer wall of the inner cylinder 2. The first sub-annular mounting groove and the second sub-annular mounting groove are arranged correspondingly to form an annular mounting groove, and the first seal 71 and the second seal 72 are both located in the annular mounting groove.

[0054] In another embodiment, a first annular mounting groove and a second annular mounting groove may be provided between one of the inner wall at the end of the intermediate cylinder 3 and the outer wall of the inner cylinder 2, and the first sealing member 71 is located in the first annular mounting groove, and the second sealing member 72 is located in the second annular mounting groove.

[0055] like Figure 1 and Figure 2 As shown, in one embodiment, the cross-section of the first sealing member 71 is circular or elliptical, and a conventional sealing member is used, which helps to reduce production costs.

[0056] like Figure 1 and Figure 2 As shown, in one embodiment, the cross-section of the second seal 72 is square to increase the contact area with the inner wall of the end of the middle cylinder 3 and the outer wall of the inner cylinder 2, so as to increase the friction between the second seal 72 and the two, thereby improving the sealing effect.

[0057] like Figure 1 and Figure 2 As shown, in one embodiment, a first sealing assembly 7 is provided between the head end of the middle cylinder 3 and the inner cylinder 2, and a first sealing assembly 7 is also provided between the tail end of the middle cylinder 3 and the inner cylinder 2. In this embodiment, by providing the first sealing assembly 7 at both the head and tail ends of the middle cylinder 3, the sealing performance of the middle cylinder 3 is improved, and the oil is prevented from flowing between the middle cylinder 3 and the outer cylinder 1 through the head and tail ends of the middle cylinder 3.

[0058] like Figure 1 and Figure 2 As shown, in one embodiment, the first sealing member 71 and the second sealing member 72 are both silicone members, but not limited thereto.

[0059] like Figure 3 As shown, in one embodiment, the first regulating valve 5 includes a valve seat 51, a valve core 52 and a knob 53. The valve seat 51 is provided with an accommodating cavity 513 and a first channel 511 and a second channel 512 communicating with the accommodating cavity 513. The first channel 511 is communicated with the middle cylinder 3, and the second channel 512 is communicated with the outer cylinder 1. The valve core 52 is located in the accommodating cavity 513. A second sealing component 8 is provided between the valve core 52 and the side wall of the accommodating cavity 513. The second sealing component 8 is arranged around the outer periphery of the valve core 52.

[0060] The knob 53 is configured to drive the valve core 52 forward so that the valve core 52 blocks the first channel 511 and to drive the valve core 52 backward so that the first channel 511 is connected to the accommodating chamber 513, and / or the knob 53 is configured to drive the valve core 52 forward so that the valve core 52 blocks the second channel 512 and to drive the valve core 52 backward so that the second channel 512 is connected to the accommodating chamber 513.

[0061] In this embodiment, a second sealing assembly 8 is provided between the valve core 52 and the side wall of the accommodating chamber 513 to achieve dynamic sealing of the oil. At the same time, in this embodiment, the valve core 52 can adjust the capacity of the oil passage in a variety of ways, thereby enriching the regulating function of the first regulating valve 5.

[0062] In one embodiment, the valve core 52 is made of copper material, so that the valve core 52 has a slightly lower hardness and thus has better sealing performance.

[0063] like Figure 3 As shown, in one embodiment, the axis of the first channel 511 is perpendicular to the axis of the second channel 512 .

[0064] like Figure 3 and Figure 5 As shown, in an embodiment in which the knob 53 is configured to drive the valve core 52 forward so that the valve core 52 blocks the first channel 511 and to drive the valve core 52 backward so that the first channel 511 is connected to the accommodating chamber 513, the valve core 52 has a first columnar portion 521, and the outer diameter of the first columnar portion 521 is equal to the inner diameter of the first channel 511.

[0065] Optionally, in an embodiment where the knob 53 is configured to drive the valve core 52 forward so that the valve core 52 blocks the first channel 511 and drives the valve core 52 backward so that the first channel 511 is connected to the accommodating chamber 513, the valve core 52 may also have a conical portion, and the outer diameter of the bottom end of the conical portion is equal to the inner diameter of the first channel 511.

[0066] like Figure 3 and Figure 4 As shown, in one embodiment, the tail of the valve core 52 is threadedly connected to the valve seat 51. In this embodiment, the knob 53 is configured to drive the valve core 52 to rotate relative to the valve seat 51 so that the valve core 52 spirally advances or retreats in the valve seat 51.

[0067] like Figure 3 and Figure 4 As shown, in one embodiment, the first regulating valve 5 also includes a transfer seat 54, which is located between the knob 53 and the valve seat 51, and the knob 53 is connected to the valve core 52 through the transfer seat 54. When the operator turns the knob 53, the knob 53 drives the valve core 52 to rotate synchronously through the transfer seat 54.

[0068] Preferably, the knob 53, the adapter seat 54 and the valve seat 51 have the same rotation axis, so that the knob 53, the adapter seat 54 and the valve seat 51 can rotate coaxially, making the structure more compact and simplified.

[0069] like Figure 3 and Figure 4 As shown, in one embodiment, a fastening screw 55 is provided between the knob 53 and the adapter 54. The fastening screw 55 passes through the knob 53 and is fixed in the adapter 54. The fastening screw 55 deviates from the rotation axis. Since the fastening screw 55 deviates from the rotation axis, the knob 53 and the adapter 54 can be stably connected with a relatively simple structure.

[0070] like Figure 3 and Figure 4As shown, in one embodiment, a retaining ring 514 is provided on the side of the valve seat 51 facing the knob 53, a gasket 56 is provided between the retaining ring 514 and the adapter seat 54, and the retaining ring 514 clamps the gasket 56 and the adapter seat 54. In this embodiment, the retaining ring 514 is used to achieve stable contact between the adapter seat 54 and the valve seat 51, and the gasket 56 is provided between the retaining ring 514 and the adapter seat 54, which can prevent the adapter seat 54 from being severely worn after long-term rotation. At the same time, because the contact surface between the retaining ring 514 and the gasket 56 is smoother than the contact surface between the retaining ring 514 and the adapter seat 54, the smoothness of the knob 53 when rotating is improved.

[0071] Specifically, the retaining ring 514 is a retaining spring.

[0072] Specifically, the gasket 56 is a hard gasket, such as a steel gasket, but not limited thereto.

[0073] like Figure 3 and Figure 4 As shown, in one embodiment, the valve seat 51 has a mounting hole facing the adapter seat 54, and an elastic member 515 and a ball 516 are arranged in the mounting hole. The elastic member 515 abuts against the ball 516, and the adapter seat 54 has a plurality of positioning grooves distributed along the circumferential direction, so that when the adapter seat 54 rotates, the positioning grooves are driven to alternately align with the ball 516 and the ball 516 enters the positioning groove under the tension of the elastic member 515, and when the adapter seat 54 continues to rotate, the ball 516 leaves the positioning groove.

[0074] This embodiment allows the operator to grasp and memorize the rotation angle of the knob 91 according to the number of times the ball 516 enters the positioning groove, and can also position the knob 91 so that the knob 53 of the first regulating valve 5 can be maintained at a preset position in a long-term vibration environment.

[0075] Specifically, the elastic member 515 is a spring.

[0076] like Figure 3 and Figure 4 As shown, in one embodiment, the knob 53 is arranged at one end of the valve seat 51 away from the outer cylinder 1, the knob 53 contacts the valve core 52 through the accommodating cavity 513, and the knob 53 extends from the end of the valve seat 31 to the side of the valve seat 31, and a fifth sealing member 57 is arranged between the side of the valve seat 31 and the knob 53.

[0077] In this embodiment, a knob 53 extending from the end of the valve seat 31 to the side of the valve seat 31 is provided to facilitate the user to operate the knob 53. At the same time, a fifth sealing member 57 is provided to seal the knob 53 and the side of the valve seat 31 to prevent dust from entering.

[0078] In one embodiment, the fifth seal 57 is annular.

[0079] In one embodiment, the fifth sealing member 57 is a silicone member, but is not limited thereto.

[0080] like Figure 3 and Figure 4 As shown, in one embodiment, a sixth sealing member 58 is provided between the valve seat 51 and the middle cylinder 3, so that the valve seat 51 and the middle cylinder 3 are sealed and connected to avoid oil leakage.

[0081] In one embodiment, the sixth seal 58 is annular.

[0082] In one embodiment, the sixth sealing member 58 is a silicone member, but is not limited thereto.

[0083] like Figure 3 and Figure 4 As shown, in one embodiment, the valve seat 51 includes a first valve seat 517 and a second valve seat 518 .

[0084] The second valve seat 518 is provided with a containing cavity 513 and a first channel 511 and a second channel 512 . The second valve seat 518 is in contact with the middle cylinder 3 . The sixth sealing member 58 is located between the second valve seat 518 and the middle cylinder 3 .

[0085] The first valve seat 517 is sleeved outside the second valve seat 518 , the first valve seat 517 is in contact with the outer cylinder 1 , the knob 53 extends to the outside of the first valve seat 517 , and the fifth sealing member 57 is located between the first valve seat 517 and the knob 53 .

[0086] A seventh sealing member 59 is disposed between the second valve seat 518 and the first valve seat 517. Specifically, the second valve seat 518 is stepped, and a seventh sealing member 59 is disposed between two adjacent surfaces of the second valve seat 518 and the first valve seat 517.

[0087] like Figure 3 and Figure 5 As shown, in an embodiment in which the knob 53 is configured to drive the valve core 52 forward so that the valve core 52 blocks the second channel 512 and to drive the valve core 52 backward so that the second channel 512 and the accommodating chamber 513 are connected, the valve core 52 has a second columnar portion 522, and the outer diameter of the second columnar portion 522 is equal to the inner diameter of the second channel 512.

[0088] like Figure 3 and Figure 5 As shown, in one embodiment, an annular groove 523 is provided on the valve core 52, and the second sealing component 8 is located in the annular groove 523. The difference between the outer diameter of the second sealing component 8 and the inner diameter of the second sealing component 8 is greater than the depth of the annular groove 523, so that the second sealing component 8 protrudes from the surface of the valve core 52 when installed on the valve core 52.

[0089] In one embodiment, the outer diameter of the valve core 52 is smaller than the inner diameter of the valve seat 51, and the outer diameter of the second sealing component 8 is equal to the inner diameter of the side wall of the accommodating chamber 513. This embodiment separates the valve core 52 from the side wall of the accommodating chamber 513, thereby reducing the friction generated between the valve core 52 and the side wall of the accommodating chamber 513 when the valve core 52 moves. At the same time, dynamic sealing of the oil is achieved through the second sealing component 8. The structure is simple, the friction is small during use, and it is easy to use.

[0090] In another embodiment, the outer diameter of the valve core 52 is equal to the inner diameter of the valve seat 51, and the outer diameter of the second sealing component 8 is larger than the inner diameter of the side wall of the accommodating chamber 513. In this embodiment, when the valve core 52 is located in the accommodating chamber 513, the second sealing component 8 is squeezed and contracted by the side wall of the accommodating chamber 513, thereby increasing the friction between the second sealing component 8 and the side wall of the accommodating chamber 513, thereby improving the dynamic sealing effect.

[0091] like Figure 3 As shown, in one embodiment, the second sealing assembly 8 includes a third sealing member 81 and a fourth sealing member 82 , and the third sealing member 81 and the fourth sealing member 82 are both located in the annular groove 523 .

[0092] like Figure 6 , Figure 7 and Figure 8 As shown, in another embodiment, the second sealing assembly 8 includes a third sealing member 81 and a fourth sealing member 82 , the annular groove 523 includes a first annular groove 5231 and a second annular groove 5232 , the third sealing member 81 is located in the first annular groove 5231 , and the fourth sealing member 82 is located in the second annular groove 5232 .

[0093] like Figure 3 As shown, in one embodiment, the third seal 81 is close to the first channel 511 and / or the second channel 512, the fourth seal 82 is located on the side of the third seal 81 away from the first channel 511 and / or the second channel 512, and the hardness of the fourth seal 82 is greater than the hardness of the third seal 81.

[0094] In this embodiment, double seals (a third seal 81 and a fourth seal 82) are provided, and the hardness of the third seal 81 close to the first channel 511 and / or the second channel 512 is lower, while the hardness of the fourth seal 82 away from the first channel 511 and / or the second channel 512 is higher. Therefore, when the oil pressure is high and the valve core 52 and the side wall of the accommodating chamber 513 cannot be sealed and connected by the third seal 81, they can still be sealed and connected by the fourth seal 82, thereby further improving the sealing effect.

[0095] like Figure 3 As shown, in one embodiment, the cross-section of the third sealing member 81 is circular or elliptical, and a conventional sealing member is used, which helps to reduce production costs.

[0096] like Figure 3 As shown, in one embodiment, the cross-section of the fourth sealing member 82 is square to increase the contact area with the valve core and the side wall of the accommodating cavity 513, so as to increase the friction between the fourth sealing member 82 and the two, thereby improving the sealing effect.

[0097] Those skilled in the art will appreciate that the accompanying drawings are merely schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily required for implementing the present application.

[0098] Those skilled in the art will appreciate that the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0099] The above application serial numbers are for description only and do not represent the advantages or disadvantages of the implementation scenarios.

[0100] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A shock absorber, characterized in that: It includes an inner cylinder, a middle cylinder and an outer cylinder which are sequentially arranged from the inside to the outside; The inner cylinder is provided with a movable piston assembly, and the inner cylinder is provided with a through hole to connect the inner cylinder with the middle cylinder; a first regulating valve is provided between the middle cylinder and the outer cylinder to connect or close the oil path between the outer cylinder and the middle cylinder, and a second regulating valve is provided between the outer cylinder and the inner cylinder to connect or close the oil path between the outer cylinder and the inner cylinder; Among them, a first sealing assembly is arranged between the end of the middle cylinder and the inner cylinder, and the first sealing assembly is arranged around the outer circumference of the inner cylinder. The first sealing assembly includes a first seal and a second seal. The first seal is close to the inner cavity of the middle cylinder, and the second seal is located on the side of the first seal away from the inner cavity of the middle cylinder. The hardness of the second seal is greater than that of the first seal.

2. The shock absorber according to claim 1, characterized in that: The cross section of the first sealing member is circular or elliptical; And / or, the cross section of the second sealing member is square.

3. The shock absorber according to claim 1, characterized in that The first regulating valve comprises a valve seat, a valve core and a knob, the valve seat is provided with an accommodating cavity and a first channel and a second channel communicating with the accommodating cavity, the first channel is communicated with the middle cylinder, the second channel is communicated with the outer cylinder, the valve core is located in the accommodating cavity, a second sealing component is provided between the valve core and the side wall of the accommodating cavity, and the second sealing component is arranged around the outer circumference of the valve core; The knob is configured to drive the valve core forward so that the valve core blocks the first channel and to drive the valve core backward so that the first channel and the accommodating chamber are connected; and / or the knob is configured to drive the valve core forward so that the valve core blocks the second channel and to drive the valve core backward so that the second channel and the accommodating chamber are connected.

4. The shock absorber according to claim 3, characterized in that: An annular groove is provided on the valve core, the second sealing component is located in the annular groove, and the difference between the outer diameter of the second sealing component and the inner diameter of the second sealing component is greater than the depth of the annular groove.

5. The shock absorber according to claim 4, characterized in that The second sealing assembly includes a third sealing member and a fourth sealing member, and the third sealing member and the fourth sealing member are both located in the annular groove; Alternatively, the second sealing assembly includes a third sealing member and a fourth sealing member, the annular groove includes a first annular groove and a second annular groove, the third sealing member is located in the first annular groove, and the fourth sealing member is located in the second annular groove.

6. The shock absorber according to claim 5, characterized in that The third seal is close to the first channel and / or the second channel, the fourth seal is located on a side of the third seal away from the first channel and / or the second channel, and the hardness of the fourth seal is greater than that of the third seal.

7. The shock absorber according to claim 6, characterized in that The cross section of the third sealing member is circular or elliptical; And / or, the cross section of the fourth sealing member is square.

8. The shock absorber according to claim 3, characterized in that: The valve core has a first columnar portion, and the outer diameter of the first columnar portion is equal to the inner diameter of the first channel; And / or, the valve core has a second columnar portion, and the outer diameter of the second columnar portion is equal to the inner diameter of the second channel; and / or, the axis of the first channel is perpendicular to the axis of the second channel; And / or, the valve core is made of copper material.

9. The shock absorber according to claim 3, characterized in that: The knob is arranged at one end of the valve seat away from the outer cylinder, and the knob extends from the end of the valve seat to the side of the valve seat, and a fifth sealing member is arranged between the side of the valve seat and the knob.

10. The shock absorber according to claim 1, characterized in that A first sealing component is arranged between the head end of the middle cylinder and the inner cylinder, and a first sealing component is also arranged between the tail end of the middle cylinder and the inner cylinder.

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