Restoration valve, auxiliary valve, and hydraulic shock absorber

Abstract

This application relates to the field of hydraulic vibration damper technology, and in particular to a secondary valve of a recovery valve and a hydraulic vibration damper. The secondary valve of the recovery valve includes a fixed ring, a sliding ring, and an elastic element. The fixed ring and the elastic element are sequentially sleeved on the piston rod and positioned and connected to the piston rod. The sliding ring is sleeved outside the fixed ring and in frictional contact with the fixed ring. At the same time, both ends of the sliding ring abut against the main valve plate of the recovery valve and the elastic element, respectively. The elastic element can undergo elastic deformation. When the main valve plate of the recovery valve opens and vibrates due to high-frequency vibration input, the main valve plate pushes the sliding ring to move. The elastic element undergoes elastic deformation under the action of the sliding ring. The rebound force of the elastic element acts on the sliding ring, pushing the sliding ring to move in the opposite direction. During the movement, the sliding ring generates friction with the fixed ring, inhibiting the movement of the sliding ring, thereby inhibiting the vibration of the main valve plate, reducing the acceleration of the piston rod, reducing the vibration transmitted from the piston rod to the vehicle body, and improving the vehicle ride comfort.

Description

Technical Field

[0001] This application relates to the field of hydraulic vibration damper technology, and in particular to a recovery valve auxiliary valve and a hydraulic vibration damper. Background Technology

[0002] Hydraulic shock absorbers are commonly used in automotive suspension systems to accelerate the attenuation of vibrations between the chassis and body, thereby improving ride comfort. However, when a vehicle is traveling on bumpy roads with high-frequency vibration input, the existing hydraulic shock absorbers have a relatively slow response. The main valve plate of the recovery valve will remain open and vibrate for a short period of time, and the vibration will be transmitted to various parts of the vehicle body through the piston rod of the shock absorber, resulting in poor ride comfort. Summary of the Invention

[0003] The purpose of this invention is to provide a recovery valve sub-valve and a hydraulic vibration damper, so as to solve to some extent the technical problem of slow response and inability to suppress high-frequency vibration in existing hydraulic vibration dampers.

[0004] This invention provides a secondary recovery valve for a hydraulic shock absorber. The secondary recovery valve includes a fixed ring, a sliding ring, and an elastic element. The fixed ring and the elastic element are sequentially sleeved on the piston rod of the hydraulic shock absorber and are positioned and connected to the piston rod. The fixed ring is located between the main valve plate of the recovery valve and the elastic element. The sliding ring is sleeved outside the fixed ring, and both ends of the sliding ring abut against the main valve plate and the elastic element, respectively. The elastic element is capable of elastic deformation along the axial direction of the piston rod.

[0005] Furthermore, the recovery valve sub-valve also includes a gasket and a fastening nut; the gasket is sleeved on the piston rod, and the fastening nut is screwed onto the piston rod to limit the installation of the fixing ring and the elastic element between the gasket and the main valve plate.

[0006] Furthermore, adjusting washers are provided between the fixing ring and the main valve plate, between the elastic element and the fixing ring, and between the elastic element and the gasket.

[0007] Furthermore, a friction element is provided on the side wall of the fixed ring, and the fixed ring makes frictional contact with the sliding ring through the friction element.

[0008] Furthermore, an annular groove is formed on the side wall of the fixing ring, and the friction element is embedded in the annular groove.

[0009] Furthermore, the friction element is an O-ring or annular gasket made of rubber.

[0010] Furthermore, the friction element is a friction ring made of metal.

[0011] Furthermore, the sliding ring has a first bend at one end facing the main valve plate; the first bend extends toward the side away from the piston rod and abuts against the main valve plate; the sliding ring has a second bend at one end facing the elastic member, the second bend extends toward the piston rod and abuts against the elastic member.

[0012] Furthermore, the elastic element is a spring sheet.

[0013] The present invention also provides a hydraulic shock absorber, including a recovery valve and a recovery valve sub-valve as described in any of the above claims.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] This invention provides a secondary valve for a hydraulic shock absorber. The secondary valve includes a fixed ring, a sliding ring, and an elastic element. The fixed ring and the elastic element are sequentially sleeved on and positioned on the piston rod, with the fixed ring located between the main valve plate and the elastic element. The sliding ring is sleeved outside the fixed ring, and its inner wall is in frictional contact with the inner wall of the fixed ring. Simultaneously, the upper end of the sliding ring abuts against the main valve plate, and the lower end abuts against the elastic element. The elastic element is capable of elastic deformation; when subjected to external force, it deforms along the length of the piston rod, i.e., in the vertical direction. When the main valve plate of the recovery valve opens and vibrates due to high-frequency vibration input, it pushes the sliding ring towards the elastic element. This causes the elastic element to be subjected to a force from the sliding ring, resulting in elastic deformation. This elastic deformation allows the sliding ring to move relative to the fixed ring. Furthermore, the rebound force of the elastic element, due to its deformation, also acts on the sliding ring, pushing it in the opposite direction. Because the inner wall of the sliding ring is in frictional contact with the outer wall of the fixed ring, friction is generated between the sliding ring and the fixed ring during movement, inhibiting the movement of the sliding ring. This, in turn, suppresses the vibration of the main valve plate, reduces the acceleration of the piston rod, decreases the vibration transmitted from the piston rod to the vehicle body, improves vehicle ride comfort, and also suppresses high-frequency tire vibration, reducing road noise.

[0016] The present invention also provides a hydraulic damper, including the aforementioned recovery valve sub-valve, thus the hydraulic damper also has the beneficial effects of the recovery valve sub-valve. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the recovery valve auxiliary valve provided in an embodiment of the present invention.

[0019] Figure label:

[0020] 1-Piston rod, 2-Piston, 3-Main valve plate, 4-Fixing ring, 5-Friction component, 6-Sliding ring, 7-Elastic component, 8-Washer, 9-Fastening nut, 10-Adjusting washer. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The following reference Figure 1 The present application describes a recovery valve, a secondary valve, and a hydraulic damper according to some embodiments thereof.

[0027] This application provides a secondary valve for a hydraulic shock absorber. The hydraulic shock absorber's recovery valve is mounted on the piston rod 1 of the hydraulic shock absorber. The recovery valve includes a piston 2, a recovery valve orifice formed on the piston 2, and a main valve plate 3. When the piston rod 1 is extended, the main valve plate 3 opens, and the chambers on both sides of the piston 2, namely the upper and lower inner chambers of the shock absorber, can be connected through the recovery valve orifice. The hydraulic oil in the upper inner chamber flows into the lower inner chamber through the recovery valve orifice and generates a recovery damping force. When the vehicle travels on a bumpy road and the shock absorber vibrates at high frequency, the main valve plate 3 opens. However, due to the slow response, the main valve plate 3 may remain open or vibrate for a short period of time. The secondary valve can act on the recovery valve to suppress the vibration of the main valve plate 3 of the recovery valve.

[0028] like Figure 1 As shown, the secondary valve of the recovery valve includes a fixed ring 4, a sliding ring 6, and an elastic element 7. The fixed ring 4 and the elastic element 7 are sequentially sleeved on the piston rod 1 and positioned and connected to the piston rod 1, with the fixed ring 4 located between the main valve plate 3 of the recovery valve and the elastic element 7. The sliding ring 6 is sleeved outside the fixed ring 4, and the inner sidewall of the sliding ring 6 is in frictional contact with the outer sidewall of the fixed ring 4. Preferably, the sliding ring 6 is in frictional contact with the fixed ring 4 through a friction element provided on the outer sidewall of the fixed ring 4. At the same time, the upper end of the sliding ring 6 abuts against the main valve plate 3, and the lower end of the sliding ring 6 abuts against the elastic element 7. The elastic element 7 can undergo elastic deformation. When the elastic element 7 is subjected to an external force, the elastic element 7 can deform along the length direction of the piston rod 1, i.e., the vertical direction.

[0029] When the main valve plate 3 of the recovery valve opens and vibrates due to high-frequency vibration input, the main valve plate 3 pushes the sliding ring 6 towards the elastic element 7, causing the elastic element 7 to be subjected to a force from the sliding ring 6 and undergo elastic deformation. This elastic deformation allows the sliding ring 6 to move relative to the fixed ring 4. As the elastic element 7 deforms, its rebound force also acts on the sliding ring 6, pushing it in the opposite direction. Because the inner wall of the sliding ring 6 is in frictional contact with the outer wall of the fixed ring 4, friction is generated between the sliding ring 6 and the fixed ring 4 during movement, inhibiting the movement of the sliding ring 6. This, in turn, suppresses the vibration of the main valve plate 3, reduces the acceleration of the piston rod 1, reduces the vibration transmitted from the piston rod 1 to the vehicle body, improves vehicle ride comfort, and also suppresses high-frequency tire vibration, reducing road noise.

[0030] In one embodiment of this application, preferably, a friction element 5 is provided on the outer side wall of the fixed ring 4, the friction element 5 forms a friction contact surface facing the side wall of the sliding ring 6, and the friction contact surface of the friction element 5 protrudes beyond the outer side wall of the fixed ring 4 by a predetermined height.

[0031] When the sliding ring 6 is sleeved outside the fixed ring 4, the inner sidewall of the sliding ring 6 can fit tightly with the friction contact surface of the friction element 5. Thus, when the sliding ring 6 moves relative to the fixed ring 4, friction can be generated between the sliding ring 6 and the friction contact surface of the friction element 5, thereby suppressing the vibration of the main valve plate 3.

[0032] In this embodiment, the friction element 5 and the fixing ring 4 can be integrally formed, or the friction element 5 can be detachably installed on the outer side wall of the fixing ring 4.

[0033] Preferably, the friction element 5 is detachably connected to the fixed ring 4; an annular groove is formed on the outer side wall of the fixed ring 4, the friction element 5 is embedded in the annular groove, and the friction contact surface of the friction element 5 faces the outer side of the fixed ring 4, and the friction contact surface protrudes from the outer side wall of the fixed ring 4 by a predetermined height, so that the inner side wall of the sliding ring 6 can be tightly fitted with the friction contact surface of the friction element 5, and can generate friction when relative movement occurs; at the same time, since the friction element 5 is a vulnerable part, by detachably setting the friction element 5 on the fixed ring 4, the friction element 5 can be easily replaced.

[0034] Meanwhile, by making the friction element 5 and the fixed ring 4 detachably connected, the specifications of the friction element can be changed to adjust the tightness of the fit between the sliding ring 6 and the friction element 5, thereby changing the magnitude of the frictional force generated between the sliding ring 6 and the friction element 5 to adapt to the damping force generated by the recovery valve. Similarly, by changing the specifications of the sliding ring 6, selecting a sliding ring 6 with a different inner diameter, the tightness of the fit between the sliding ring 6 and the friction element 5 can also be adjusted.

[0035] Preferably, there can be multiple friction elements 5, which are spaced apart on the outer side wall of the fixed ring 4 along the length direction of the fixed ring 4.

[0036] When there are multiple friction components 5, and the friction components 5 are detachably connected to the fixing ring 4, there are also multiple annular grooves for placing the friction components 5, with each annular groove corresponding to a different friction component 5.

[0037] In one embodiment of this application, preferably, the friction element 5 can be an O-ring or annular washer made of elastic rubber; the O-ring or annular washer can be embedded in the annular groove, and the O-ring or annular washer protrudes from the outer side wall of the fixed ring 4 by a predetermined height; when the sliding ring 6 is sleeved on the fixed ring 4, the O-ring or annular washer can be clamped between the sliding ring 6 and the fixed ring 4 and undergo elastic deformation. When the sliding ring 6 moves relative to the fixed ring 4 and the friction element 5, a predetermined frictional force is generated between the sliding ring 6 and the O-ring or annular washer, thereby suppressing the vibration of the main valve plate 3 and improving the vehicle ride comfort.

[0038] Preferably, the friction element 5 can also be a metal friction element 5. The friction element 5 is restricted and fixed in the annular groove of the fixed ring 4. The friction contact surface of the friction element 5 faces the sliding ring 6 and protrudes from the outer side wall of the fixed ring 4 by a predetermined height. The sliding ring 6 and the friction contact surface of the friction element 5 are in frictional contact so that frictional force is generated when the sliding ring 6 moves. The friction element 5 is made of metal so that the friction element 5 is not easily worn, thereby extending the service life of the reset valve sub-valve.

[0039] In one embodiment of this application, the elastic element 7 is a spring sheet, which is sleeved on the piston rod 1 and positioned therewith. When the spring sheet is subjected to a force, it can deform along the length of the piston rod 1, i.e., in the vertical direction. The lower end of the sliding ring 6 abuts against the spring sheet. When the main valve plate 3 vibrates and pushes the sliding ring 6 downward, the sliding ring 6 applies a force to the spring sheet, causing it to elastically deform. Simultaneously, the spring sheet also applies a reverse pushing force to the sliding ring 6, pushing it to move in the opposite direction, thereby generating friction when the sliding ring 6 moves.

[0040] By replacing the spring sheets with different specifications and selecting spring sheets with different stiffnesses, the rebound force of the spring sheets can be adjusted.

[0041] In one embodiment of this application, preferably, the secondary valve of the recovery valve further includes a gasket 8 and a fastening nut 9. The gasket 8 is sleeved on the piston rod 1, so that the gasket 8 is located below the elastic element 7. The fastening nut 9 can be screwed onto the piston rod 1, and by screwing the fastening nut 9, the gasket 8 abuts against the elastic element 7. The fastening nut 9 and the gasket 8 limit the movement of the elastic element 7, the fixed ring 4, and the sliding ring 6, while also preventing fatigue of the elastic element 7.

[0042] In one embodiment of this application, preferably, an adjusting washer 10 is provided between the fixed ring 4 and the main valve plate 3, and adjusting washers 10 are also provided between the fixed ring 4 and the elastic member 7 and between the elastic member 7 and the washer 8; by changing the height of the adjusting washer 10, the distance between the elastic member 7 and the main valve plate 3 is adapted to the height of the sliding ring 6, and the sliding ring 6 can be installed between the elastic member 7 and the main valve plate 3, with both ends of the sliding ring 6 abutting against the main valve plate 3 and the elastic member 7 respectively; at the same time, by adjusting the height of the three adjusting washers 10, the rebound force of the spring pad on the sliding ring 6 can also be adjusted.

[0043] In one embodiment of this application, preferably, the sliding ring 6 includes a sliding ring body, a first bent portion, and a second bent portion. The first bent portion and the second bent portion are located at opposite ends of the sliding ring body and are perpendicular to the sliding ring body. The first bent portion is located at the end of the sliding ring body near the main valve plate 3 and extends away from the fixed ring 4, abutting against the main valve plate 3. The second bent portion is located at the end of the sliding ring body near the elastic member 7 and extends towards the fixed ring 4, abutting against the elastic member 7. By providing the first bent portion, the contact area between the sliding ring 6 and the main valve plate 3 is increased; by providing the second bent portion, the contact area between the sliding ring 6 and the elastic member 7 is increased. This allows the two ends of the sliding ring 6 to stably abut against the main valve plate 3 and the elastic member 7, respectively, enabling the sliding ring 6 to move under the push of the main valve plate 3 and the elastic member 7.

[0044] This application also provides a hydraulic damper, including a recovery valve and a recovery valve sub-valve of any of the above embodiments.

[0045] In this embodiment, the hydraulic damper includes a reset valve sub-valve, and therefore the hydraulic damper has all the beneficial effects of the reset valve sub-valve, which will not be described in detail here.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A secondary valve for a recovery valve, used in a hydraulic shock absorber; characterized in that, Includes a fixed ring, a sliding ring, and an elastic element; The fixed ring and the elastic element are sequentially sleeved on the piston rod of the hydraulic damper and are positioned and connected to the piston rod. The fixed ring is located between the main valve plate of the recovery valve and the elastic element. The sliding ring is sleeved outside the fixed ring, and both ends of the sliding ring abut against the main valve plate and the elastic element, respectively. The elastic element is capable of elastic deformation along the axial direction of the piston rod; A friction element is provided on the side wall of the fixed ring, and the fixed ring makes frictional contact with the sliding ring through the friction element; When the main valve plate opens and vibrates, it will push the sliding ring toward the elastic element, causing the elastic element to undergo elastic deformation. As the elastic element deforms, its rebound force will act on the sliding ring and push it to move in the opposite direction. During its movement, the sliding ring generates friction with the fixed ring, which inhibits the movement of the sliding ring and thus suppresses the vibration of the main valve plate.

2. The recovery valve auxiliary valve according to claim 1, characterized in that, The recovery valve sub-valve also includes a gasket and a fastening nut; The gasket is sleeved on the piston rod, and the fastening nut is screwed onto the piston rod to limit the installation of the retaining ring and the elastic element between the gasket and the main valve plate.

3. The recovery valve auxiliary valve according to claim 2, characterized in that, Adjusting washers are provided between the fixed ring and the main valve plate, between the elastic element and the fixed ring, and between the elastic element and the gasket.

4. The recovery valve auxiliary valve according to claim 1, characterized in that, An annular groove is formed on the side wall of the fixed ring, and the friction element is embedded in the annular groove.

5. The recovery valve auxiliary valve according to claim 1, characterized in that, The friction element is an O-ring or annular gasket made of rubber.

6. The recovery valve auxiliary valve according to claim 1, characterized in that, The friction element is a friction ring made of metal.

7. The recovery valve auxiliary valve according to claim 1, characterized in that, The sliding ring has a first bend at one end facing the main valve plate; The first bend extends toward the side opposite to the piston rod, and the first bend abuts against the main valve plate; The sliding ring forms a second bend at one end toward the elastic member, the second bend extends toward one side of the piston rod, and the second bend abuts against the elastic member.

8. The recovery valve auxiliary valve according to claim 7, characterized in that, The elastic element is a spring sheet.

9. A hydraulic shock absorber, characterized in that, Includes a recovery valve and a recovery valve sub-valve as described in any one of claims 1 to 8.

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