Overflow valve, shock absorber and vehicle

Abstract

The overflow valve comprises a valve body (1), a shell (2) and a valve seat (16), the valve seat (16) is arranged in the shell (2) so that an inner cavity of the shell (2) can be divided into a first oil cavity (3) and an installation cavity (6), the valve body (1) is arranged in the installation cavity (6) in a sliding mode so that the installation cavity (6) can be divided into a second oil cavity (7) and a third oil cavity (9), and oil in the third oil cavity (9) can provide force for driving the valve body (1) to be close to the valve seat (16). An overflow valve liquid outlet hole (5) is formed in the side wall, corresponding to the second oil cavity (7), of the shell (2), the valve body (1) can slide in the installation cavity (6) so as to adjust the through-flow area between the second oil cavity (7) and the overflow valve liquid outlet hole (5), and a first channel used for connecting the second oil cavity (7) and the third oil cavity (9) is formed in the valve body (1). The utility model further relates to a shock absorber and a vehicle. The overflow valve can provide large damping force.

Description

Technical Field

[0001] The utility model relates to a hydraulic valve, in particular to a relief valve, and further relates to a shock absorber and a vehicle comprising the relief valve. Background Art

[0002] Shock absorbers are an indispensable part of the automobile suspension structure. Shock absorbers are the main damping elements of the entire vehicle suspension system. Their function is to quickly attenuate vehicle body vibrations, improve the smoothness and comfort of the vehicle during driving, enhance the adhesion between the wheels and the ground, and improve the stability of vehicle control. Solenoid valve shock absorbers are a common type of shock absorber. They change the current to make the coil generate different electromagnetic forces, drive the push rod inside the solenoid valve, change the position of the main piston, thereby changing the size of the leakage channel, affecting the internal oil flow, and ultimately achieving the purpose of adjusting the damping force.

[0003] In recent years, due to the rapid development of the automobile industry, the market's performance requirements for shock absorbers have gradually increased. The damping bandwidth of the solenoid valve shock absorber in the existing technology is difficult to be small, resulting in the shock absorber being unable to suppress the impact of the road in some working conditions, causing the body to shake and affecting the user's driving experience.

[0004] In view of this, it is necessary to design a relief valve that can effectively solve or alleviate the above technical defects. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a relief valve, which can provide a larger damping force.

[0006] Furthermore, the technical problem to be solved by the utility model is to provide a shock absorber which can provide a larger damping force and has higher adaptability and versatility.

[0007] Furthermore, the technical problem to be solved by the utility model is to provide a vehicle whose shock absorber can provide a larger damping force to improve driving smoothness.

[0008] In order to solve the above technical problems, the utility model provides a relief valve, which comprises:

[0009] A housing, wherein a valve seat is disposed in the housing, and the valve seat divides the inner cavity of the housing into a first oil cavity and a mounting cavity;

[0010] A valve body, wherein the valve body is slidably disposed in the mounting cavity, a second oil cavity is formed between the valve body and the valve seat, and a valve seat communicating oil passage is formed on the valve seat, wherein the valve seat communicating oil passage is used to communicate the first oil cavity with the second oil cavity;

[0011] A relief valve outlet hole, wherein the relief valve outlet hole is arranged on a side wall of the housing corresponding to the second oil chamber, and the valve body can slide axially in the mounting chamber to adjust a flow cross-sectional area between the second oil chamber and the relief valve outlet hole;

[0012] A third oil chamber is formed between the valve body and the housing, and the oil pressure in the third oil chamber can provide a force to drive the valve body to move closer to the valve seat. The valve body is provided with a first channel, and the first channel connects the second oil chamber and the third oil chamber.

[0013] Preferably, a fourth oil chamber is formed at one end of the shell away from the valve seat, and the valve body is formed with a second channel and a pilot valve body matching hole, the second channel is used to connect the second oil chamber and the fourth oil chamber, the pilot valve body matching hole is used to correspond to the push rod setting of the pilot valve, so that the push rod can be pressed against the pilot valve body matching hole to form a seal, and the third oil chamber can be connected to the fourth oil chamber through the pilot valve body matching hole.

[0014] Specifically, the valve seat includes a valve seat body, a relief valve disc and a connecting piece, the relief valve disc is installed on one end of the valve seat body close to the valve body through the connecting piece, the valve seat body is formed with a valve seat connecting hole, the relief valve disc is formed with a valve disc connecting hole, so as to form the valve seat connecting oil channel through the valve disc connecting hole and the valve seat connecting hole, a valve body valve line is formed on one end of the valve body close to the relief valve disc, the valve body valve line can cooperate with the relief valve disc to form a seal to cut off the second oil chamber and the relief valve outlet hole, the valve body can slide axially in the installation cavity to control the distance between the relief valve disc and the valve body valve line, and adjust the flow cross-sectional area between the second oil chamber and the relief valve outlet hole.

[0015] Preferably, the relief valve further comprises an elastic return member, wherein the elastic return member is disposed in the mounting cavity, and the elastic return member can provide a force for driving the valve body to move away from the valve seat.

[0016] Preferably, the elastic return member is a return spring, an annular mounting base is formed at one end of the valve body close to the valve seat body, a spring mounting portion is formed at one end of the connecting member close to the valve body, one end of the return spring is arranged in the annular mounting base, and the other end is sleeved on the spring mounting portion.

[0017] Preferably, the overflow valve further comprises a throttling channel, and the throttling channel is used to connect the first oil chamber and the overflow valve liquid outlet hole.

[0018] Specifically, the throttling channel is a valve seat throttling hole arranged on the valve seat.

[0019] Specifically, an L-shaped step surface is formed at one end of the valve body away from the valve seat, so that the inner surface of the shell cooperates with the L-shaped step surface to form the third oil chamber.

[0020] Preferably, the first channel includes a valve body throttling hole, an inner and outer connecting hole and an inner connecting oil channel, the second oil chamber is connected to the third oil chamber in sequence through the valve body throttling hole, the inner connecting oil channel and the inner and outer connecting hole, and the inner connecting oil channel is connected to the pilot valve body matching hole.

[0021] Preferably, a housing throttle hole is also formed on the housing side wall, and the housing throttle hole is used to connect the internal connecting oil channel with the shock absorber chamber.

[0022] Preferably, the housing and the valve body cooperate to form an annular cavity, and the housing throttle hole is connected to the internal connecting oil channel through the annular cavity.

[0023] Preferably, an overflow valve surface oil groove is formed on the outer surface of the valve body, and the annular cavity is connected to the third oil cavity through the overflow valve surface oil groove.

[0024] On the basis of the technical solution of the above overflow valve, the utility model further provides a shock absorber, which includes the overflow valve of any of the above technical solutions.

[0025] On the basis of the technical solutions of the above shock absorbers, the utility model also provides a vehicle, which includes the shock absorber of any of the above technical solutions.

[0026] Through the above technical scheme, the utility model provides a relief valve, the third oil chamber of the relief valve can provide a force to drive the valve body close to the valve seat, further increasing the pressure difference between the upper and lower sides of the valve body, so that the second oil chamber requires a greater pressure to push the valve body open, that is, when the pressure of the second oil chamber is the same, the flow cross-sectional area between the second oil chamber of the present application and the liquid outlet of the relief valve is smaller, thereby generating a greater damping force, and the relief valve can provide a higher compression damping force for the compression stroke.

[0027] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The cross-sectional view of the overflow valve of the utility model is shown in FIG. Figure 1 ;

[0029] Figure 2 The cross-sectional view of the overflow valve of the utility model is shown in FIG. Figure 2 ;

[0030] Figure 3This is a schematic diagram of the structure of the valve body of the specific implementation method of the utility model. Figure 1 ;

[0031] Figure 4 This is a schematic diagram of the structure of the valve body of the specific implementation method of the utility model. Figure 2 ;

[0032] Figure 5 It is a structural schematic diagram of a shock absorber according to a specific implementation mode of the utility model;

[0033] Figure 6 It is an exploded view of a relief valve according to a specific embodiment of the utility model;

[0034] Figure 7 yes Figure 5 A schematic diagram of the flow path of the relief valve when the coil assembly of the shock absorber is not powered and compressed;

[0035] Figure 8 yes Figure 5 Schematic diagram of the flow path of the relief valve when the coil assembly of the shock absorber is energized and compressed Figure 1 ;

[0036] Fig. 9 yes Figure 5 Schematic diagram of the flow path of the relief valve when the coil assembly of the shock absorber is energized and compressed Figure 2 ;

[0037] Fig.10 yes Figure 5 A schematic diagram of the flow path of the relief valve when the coil assembly of the shock absorber is not energized and restored;

[0038] Fig.11 yes Figure 5 Schematic diagram of the flow path of the overflow valve when the coil assembly of the shock absorber is energized and restored Figure 1 ;

[0039] Fig.12 yes Figure 5 Schematic diagram of the flow path of the overflow valve when the coil assembly of the shock absorber is energized and restored Figure 2 .

[0040] Description of Reference Numerals

[0041] 1 Valve body 2 Shell

[0042] 3First oil chamber 4Fourth oil chamber

[0043] 5 overflow valve outlet hole 6 installation cavity

[0044] 7 Second oil chamber 8 L-shaped step surface

[0045] 9 Third oil chamber 10 Valve body throttle hole

[0046] 11 inner and outer connecting holes 12 inner connecting oil passage

[0047] 13 pilot valve body matching hole 14 valve body inner hole

[0048] 15 return spring 16 valve seat

[0049] 17 Valve seat body 18 Overflow valve disc

[0050] 19 Connecting piece 20 Valve seat connecting hole

[0051] 21 Valve plate connecting hole 22 Valve body valve line

[0052] 23 annular mounting base 24 spring mounting portion

[0053] 25 Shell throttle hole 26 Annular cavity

[0054] 27 Relief valve surface oil groove 28 Valve seat throttle hole

[0055] 29 Shell air guide hole 30 Overflow valve connection thread

[0056] 31 shock absorber first oil chamber 32 shock absorber second oil chamber

[0057] 33 coil assembly 34 pilot valve

[0058] 35 push rod 36 reset valve assembly

[0059] 37 Valve seat connected to oil channel DETAILED DESCRIPTION

[0060] The following is a further detailed description of the implementation of the utility model in conjunction with the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the utility model, but cannot be used to limit the scope of the utility model. The utility model can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0061] The utility model provides these embodiments to make the utility model thorough and complete, and fully express the scope of the utility model to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps described in these embodiments should be interpreted as merely exemplary, rather than as a limitation.

[0062] It should be noted that, in the description of the present invention, unless otherwise specified, the terms "upper", "lower", "inner", "outer", etc. indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0063] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0064] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0065] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0066] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0067] Figure 1 and Figure 2 It is a schematic cross-sectional view of the overflow valve of the same embodiment taken from different directions. Figure 1 Mainly reflects the first channel, Figure 2 Mainly reflects the second channel, Figure 2 Mainly manifested, Figure 3 and Figure 4 It is a schematic diagram of the structure of the valve body formed by observing the valve body from different directions. Figure 3 is a schematic diagram of the valve body structure observed from the side of the second oil chamber 7, Figure 4 is a schematic diagram of the valve body structure observed from the side of the fourth oil chamber 4, Figure 8 and Fig. 9 It is a schematic diagram of the flow path formed by the overflow valve intercepting the coil assembly from different directions when the coil assembly is energized and compressed in the same embodiment. Fig.11 and Fig.12 It is a schematic diagram of the flow path formed by the overflow valve intercepting the coil assembly from different directions in the same embodiment when the coil assembly is energized and restored.

[0068] The following mainly focuses on Figure 5 The mounting structure shown illustrates the principle of the overflow valve of the present application only for the convenience of describing and understanding the present application, and does 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.

[0069] like Figures 1 to 6 As shown, the utility model provides a relief valve, which includes a valve body 1, a shell 2 and a valve seat 16. The shell 2 is provided with a valve seat 16, and the valve seat 16 divides the inner cavity of the shell 2 into a first oil chamber 3 and a mounting chamber 6. The valve body 1 is slidably arranged in the mounting chamber 6, and a second oil chamber 7 is formed between the valve body 1 and the valve seat 16. The valve seat 16 is formed with a valve seat connecting oil passage 37 for connecting the first oil chamber 3 and the second oil chamber 7. An overflow valve liquid outlet hole 5 is formed on the side wall of the shell 2 corresponding to the third oil chamber 7. The valve body 1 can slide axially in the mounting chamber 6 to adjust the flow cross-sectional area between the third oil chamber 7 and the overflow valve liquid outlet hole 5, wherein a third oil chamber 9 is formed between the valve body 1 and the shell 2, and the oil pressure in the third oil chamber 9 can provide a force to drive the valve body 1 to move close to the valve seat 16. The valve body 1 is provided with a first channel, and the first channel connects the second oil chamber 7 and the third oil chamber 9. As shown Figure 5As shown, in this embodiment, the first oil chamber 3 is connected to the second oil chamber 32 of the shock absorber through the restoring valve assembly 36, and the relief valve outlet hole 5 is connected to the first oil chamber 31 and the second oil chamber 7 of the shock absorber. During the compression process of the shock absorber, the oil in the second oil chamber 32 of the shock absorber flows into the first oil chamber 3 through the restoring valve assembly 36, and then flows into the second oil chamber 7 through the valve seat connecting oil channel 37. On the one hand, the oil in the second oil chamber 7 flows into the first oil chamber 31 of the shock absorber from the relief valve outlet hole 5 to generate a damping force. On the other hand, the oil in the second oil chamber 7 enters the third oil chamber 9 through the first channel. The oil in the third oil chamber 9 can provide the valve body 1 with a force to drive it to move closer to the valve seat 16, so that the second oil chamber 7 requires a larger hydraulic pressure to be able to push the valve body 1 away from the valve seat 16. The valve body 1 moves in the same direction as the second oil chamber 7 and the liquid outlet hole 5 of the relief valve because the valve body 1 slides axially in the mounting cavity 6, so that the flow cross-sectional area between the second oil chamber 7 and the liquid outlet hole 5 of the relief valve can be adjusted. As a result, in this embodiment, the distance between the valve body 1 and the valve seat 16 is proportional to the flow cross-sectional area between the second oil chamber 7 and the liquid outlet hole 5 of the relief valve. Therefore, by setting the third oil chamber 9, the second oil chamber 7 needs to accumulate a greater pressure to push the valve body 1, thereby increasing the pressure difference between the second oil chamber 7 and the first oil chamber 31 of the shock absorber. Since the pressure difference is proportional to the damping force difference, the damping force generated in the compression stroke is increased.

[0070] As a preferred embodiment, Figure 1 , Figure 2 and Figure 5As shown, one end of the valve body 1 away from the valve seat 16 and the other end of the shell 2 away from the valve seat 16 cooperate to form a fourth oil chamber 4, and the valve body 1 is formed with a second channel and a pilot valve body matching hole 13, the second channel is used to connect the second oil chamber 7 and the fourth oil chamber 4, the third oil chamber 9 can be connected to the fourth oil chamber 4 through the pilot valve body matching hole 13. The pilot valve body matching hole 13 is used to correspond to the push rod 35 of the pilot valve 34, so that the front end push plate of the push rod 35 can be pressed against the pilot valve body matching 13 to form a seal. In this embodiment, the pilot valve 34 is an electrically controlled valve. When the coil assembly 33 of the pilot valve 34 is energized, the push rod 35 abuts against the matching hole 13 of the pilot valve body to form a seal, and pushes the valve body 1 to approach the valve seat 16, reducing the flow cross-sectional area between the second oil chamber 7 and the overflow valve outlet hole 5 until it is closed. At this time, the shock absorber is compressed, and the oil in the second oil chamber 32 of the shock absorber passes through the recovery valve assembly 36, the first oil chamber 3 and the valve seat connecting oil passage 37 in turn into the second oil chamber 7. Since the second oil chamber 7 and the overflow valve outlet hole 5 are closed, on the one hand, the oil flows from the first oil chamber 7 to the second oil chamber 7. One channel flows into the third oil chamber 9, providing the valve body 1 with a force to drive it to move closer to the valve seat 16. On the other hand, as the shock absorber is compressed, the oil pressure in the system continues to increase until the oil pressure is greater than the electromagnetic force on the push rod 35. The oil pushes the push rod 35 into the fourth oil chamber 4 and flows back into the second oil chamber 7 through the second channel. At this time, since the valve body 1 is less pushed by the push rod 35, the valve body 1 moves away from the valve seat 16, so that the flow cross-sectional area between the overflow valve outlet hole 5 and the third oil chamber 7 increases, and the oil flows out of the overflow valve outlet hole 5 to generate a damping force. As the current in the coil assembly 33 increases, the thrust applied by the push rod 35 on the valve body 1 increases, so that the second oil chamber 7 needs to accumulate greater pressure to push the push rod 35 open. When the overflow valve outlet hole 5 and the second oil chamber 7 are connected, the pressure difference between the second oil chamber 7 and the first oil chamber 31 of the shock absorber increases. Since the damping force is proportional to the pressure difference, the damping force of the overflow valve is proportional to the current of the coil assembly 33, thereby achieving adjustable damping. Compared with the prior art, since the embodiment is provided with the third oil chamber 9 which can provide the force to drive the valve body to move close to the valve seat 16, the second oil chamber 7 requires a greater pressure to push open the valve body 1, so that the flow cross-sectional area between the overflow valve outlet hole 5 and the third oil chamber 7 is more difficult to increase, thereby making the pressure difference between the first oil chamber 31 of the shock absorber and the second oil chamber 32 of the shock absorber larger. Since the damping force is proportional to the pressure difference, the overflow valve of the present application can provide a greater damping force and has a larger damping bandwidth, and thus the overflow valve of the present application has higher adaptability and versatility.

[0071] As a specific implementation method, Figure 1 , Figure 2 and Figure 6As shown, the valve seat 16 includes a valve seat body 17, a relief valve disc 18 and a connecting piece 19. In this embodiment, the connecting piece 19 is a screw. The valve seat body 17 and the relief valve disc 18 are formed with screw mounting holes at corresponding positions. The screw is formed with a clamping step surface. The bolt portion of the screw passes through the screw mounting holes on the relief valve disc 18 and the valve seat body 17. The side surface of the valve seat body 17 close to the valve body 1 cooperates with the clamping step surface to clamp the relief valve disc 18. The valve seat body 17 is formed with a valve seat communicating hole 20. The relief valve disc 18 is formed with a valve disc communicating hole 21. The valve seat communicating hole 20 and the valve disc communicating hole 21 cooperate to form a valve seat connecting hole. The oil passage 37 is formed so that the first oil chamber 3 and the second oil chamber 7 are connected through the valve seat connecting hole 20 and the valve plate connecting hole 21. A valve body valve line 22 is formed at one end of the valve body 1 close to the overflow valve plate 18, wherein the projection of the valve body valve line 22 on the overflow valve plate 18 can surround the valve plate connecting hole 21, so that as the distance between the valve body 1 and the overflow valve plate decreases, the gap between the valve body valve line 22 and the overflow valve plate 18 decreases, and the flow cross-sectional area between the second oil chamber 7 and the overflow valve outlet hole 5 decreases. When the valve body valve line 22 abuts against the overflow valve plate 18, the second oil chamber 7 and the overflow valve outlet hole 5 are closed. In addition, the housing 2, the valve seat body 17, the overflow valve plate 18 and the connecting member 19 of this embodiment are split structures, which are only for the convenience of installation, and can also be set as an integrated structure, all of which belong to the protection scope of this application.

[0072] As a preferred embodiment, Figure 1 and Figure 2 As shown, the overflow valve of this embodiment further includes an elastic reset member 15, which is disposed in the mounting cavity 6 and can provide a force to drive the valve body 1 to move away from the valve seat 16. Figure 5 As shown, when the coil assembly 33 of this embodiment is not energized, the elastic reset member 15 can provide the valve body 1 with a force to drive it away from the valve seat 16, so that the distance between the valve body 1 and the valve seat 16 is the farthest, and the flow cross-sectional area between the overflow valve outlet hole 5 and the third oil chamber 7 is the largest. At this time, the shock absorber is compressed, and the oil in the second oil chamber 32 of the shock absorber passes through the restoration valve assembly 36, the first oil chamber 3 and the valve seat connecting oil channel 37 in turn into the second oil chamber 7, and directly flows into the first oil chamber 31 of the shock absorber through the overflow valve outlet hole 5. At this time, the compression damping force is the smallest, and the shock absorber exhibits a soft compression.

[0073] As a preferred implementation mode, Figure 1 and Figure 2As shown, the elastic return member of this embodiment is a return spring 15, and an annular mounting base 23 is formed at one end of the valve body 1 close to the overflow valve disc 18. The connecting member 19 is a screw, and the nut portion of the screw forms a spring mounting portion 24. One end of the return spring is sleeved on the spring mounting portion 24, and the other end is arranged in the annular mounting base 23. The elastic return member and the installation structure of the elastic return member of this embodiment are simple, and the processing difficulty is low, and it is also helpful to reduce the weight of the valve body 1.

[0074] As a preferred embodiment, Figure 1 and Figure 2 As shown, the relief valve of this embodiment also includes a throttling channel, which is used to connect the first oil chamber 31 of the shock absorber and the second oil chamber 32 of the shock absorber. The relief valve is provided with a throttling channel as a normally open throttling hole, such as Figure 5 and Figure 7 As shown, in this embodiment, when the coil assembly 33 is energized, the valve body 1 is pushed by the push rod 35 so that the valve body 1 is abutted against the valve seat 16. At this time, the shock absorber is compressed, and the oil in the first oil chamber 31 of the shock absorber flows into the first oil chamber 3 through the restoring valve assembly 36. Since the throttling channel can connect the first oil chamber 3 and the overflow valve outlet 5, the oil in the first oil chamber 3 can directly flow into the first oil chamber 31 of the shock absorber through the throttling channel to generate a damping force.

[0075] As a specific implementation method, Figure 1 and Figure 5 As shown, the throttling channel of this embodiment is a valve seat throttling hole 28 arranged on the valve seat 16. The valve seat throttling hole 28 is used to connect the first oil chamber 3 and the overflow valve outlet hole 5, so that in the shock absorber compression project, the oil in the second oil chamber 32 of the shock absorber can flow into the first oil chamber 3 through the restoration valve assembly 36, and then flow into the first oil chamber 31 of the shock absorber through the valve seat throttling hole 28 to generate a damping force. In the process of shock absorber recovery, the oil in the first oil chamber 31 of the shock absorber can enter the first oil chamber 3 through the valve seat throttling hole 28, and then enter the second oil chamber 32 of the shock absorber through the restoration valve assembly 36 to generate a damping force. The throttling channel can be implemented in various ways. For example, a notch can be formed on the valve body valve line 22 to ensure that the first oil chamber 31 of the shock absorber and the second oil chamber 32 of the shock absorber are connected through the notch, which will not be elaborated here.

[0076] As a specific implementation method, Figure 1As shown, an L-shaped step surface 8 is formed at one end of the valve body 1 away from the valve seat 16, so that the inner surface of the shell 2 cooperates with the L-shaped step surface 8 to form a third oil chamber 9. After the oil enters the third oil chamber 9 from the inner and outer connecting holes 11, the oil in the third oil chamber 9 generates pressure toward the valve seat 16 on the surface of the L-shaped step surface 8, which hinders the valve body 1 from moving away from the valve seat 16, so that the second oil chamber 7 requires a greater pressure to push the valve body 1, and the flow area between the overflow valve outlet hole 5 and the second oil chamber 7 is more difficult to increase, thereby generating a greater damping force.

[0077] As a preferred implementation mode, Figure 1 and Figure 2 As shown, the first channel includes a valve body throttling hole 10, an inner and outer connecting hole 11 and an inner connecting oil passage 12. The second oil chamber 7 is connected to the third oil chamber 9 through the valve body throttling hole 10, the inner connecting oil passage 12 and the inner and outer connecting hole 11 in sequence. The fourth oil chamber 4 is connected to the inner connecting oil passage 12 through the pilot valve body matching hole 13. During the compression of the shock absorber, due to the provision of the valve body throttling hole 10, the oil pressure of the inner connecting oil passage 12 is lower than that of the second oil chamber 7. Therefore, the first oil chamber 3 needs to accumulate more pressure to accumulate enough pressure in the inner connecting oil passage 12 to push the push rod 35 open, thereby increasing the opening pressure of the pilot valve body matching hole 13, so that the pressure difference between the first oil chamber 31 of the shock absorber and the second oil chamber 32 of the shock absorber is larger, thereby obtaining a larger compression damping bandwidth range.

[0078] As a preferred implementation mode, Figure 1 and Figure 5As shown, a housing throttle hole 25 is also formed on the side wall of the housing 2 of this embodiment. The housing throttle hole 25 is used to connect the internal connecting oil passage 12 with the first oil chamber 31 of the shock absorber. The second channel includes the valve body inner hole 14. During the recovery process of the shock absorber of this embodiment, when the coil assembly 33 is not energized, the oil in the first oil chamber 31 of the shock absorber flows into the first oil chamber 3 through the valve seat throttle hole 28, and then enters the second oil chamber 32 of the shock absorber through the recovery valve assembly 36 to generate damping force. On the other hand, the oil enters the second oil chamber 7 through the overflow valve outlet hole 5, and then passes through the valve seat connecting oil passage 37, the first oil chamber 3 and the recovery valve assembly 36 in sequence to enter the second oil chamber 32 of the shock absorber. At this time, the damping force of the overflow valve is the smallest. When the coil assembly 33 is energized, the push rod 35 abuts against the matching hole 13 of the pilot valve body. The valve body 1 is pushed against the overflow valve disc 18, and a part of the oil in the first oil chamber 31 of the shock absorber flows into the first oil chamber 3 through the valve seat throttling hole 28, and then enters the second oil chamber 32 of the shock absorber through the restoring valve assembly 36, generating a first restoring damping force, and another part of the oil in the first oil chamber 31 of the shock absorber enters the internal connecting oil passage 12 through the housing throttling hole 25, and enters the third oil chamber 9 through the internal and external connecting holes 11. The oil in the third oil chamber 9 provides the L-shaped step surface 8 with a force to drive the valve body 1 to move close to the valve seat 16, and causes the oil pressure in the internal connecting oil passage 12 to continue to increase until the oil pushes open the push valve. The push rod 35 enters the fourth oil chamber 4, and then flows into the second oil chamber 7 through the valve body inner hole 14, and finally enters the second oil chamber 32 of the shock absorber through the valve seat connecting oil passage 37, the first oil chamber 3 and the restoring valve assembly 36, generating a second restoring damping force. As the push rod 35 is pushed open, the valve body 1 is less subjected to the pressure of the push rod 35, and the valve body 1 moves away from the valve seat 16, and the flow cross-sectional area between the second oil chamber 7 and the relief valve outlet hole 5 increases, so that a part of the oil in the first oil chamber 31 of the shock absorber can enter the second oil chamber 7 through the relief valve outlet hole 5, and then flow into the second oil chamber 7 through the valve body inner hole 14, and finally pass through The valve seat connecting oil channel 37, the first oil chamber 3 and the restoring valve assembly 36 enter the second oil chamber 32 of the shock absorber to generate a third restoring damping force. The first restoring damping force, the second restoring damping force and the third restoring damping force together constitute the restoring damping force. Since the oil in the third oil chamber 9 of the present application can apply pressure toward the valve seat 16 to the valve body 1, it is more difficult to increase the flow area between the overflow valve outlet hole 5 and the second oil chamber 7, thereby providing a larger third restoring damping force. Furthermore, by setting the shell throttle hole 25, the third oil chamber 9 of the overflow valve of the present application can increase the damping force during both compression and restoration.

[0079] As a preferred implementation mode, Figure 1 and Figure 2As shown, a groove is formed on the inner wall surface of the shell 2 of this embodiment at a position corresponding to the internal connecting oil passage 12, and the groove cooperates with the outer surface of the valve body 1 to form an annular cavity 26 to ensure that when the valve body 1 moves in the installation cavity 6, the shell throttle hole 25 can always be connected to the internal connecting oil passage 12, thereby improving functional reliability and reducing the contact area between the outer surface of the valve body 1 and the inner wall surface of the shell 2, thereby reducing the friction between the valve body 1 and the shell 2.

[0080] As a preferred implementation mode, Figures 2 to 4 As shown, an overflow valve surface oil groove 27 is formed on the outer surface of the valve body 1, and the annular cavity 26 is connected to the third oil chamber 9 through the overflow valve surface oil groove 27. The rate at which oil enters the third oil chamber 9 is replenished through the overflow valve surface oil groove 27, and the impact of the liquid path corner is optimized. In addition, by setting the overflow valve surface oil groove 27, the contact area between the outer surface of the valve body 1 and the inner wall of the shell 2 is reduced, thereby reducing the friction between the valve body 1 and the shell 2.

[0081] The utility model provides a preferred overflow valve, such as Figures 1 to 4As shown, the relief valve includes a valve body 1, a shell 2, a return spring 15 and a valve seat 16. The shell 2 is provided with a valve seat 16 to separate the inner cavity of the shell 2 into a first oil chamber 3 and a mounting chamber 6 through the valve seat 16. The first oil chamber 3 is used to connect the second oil chamber 32 of the shock absorber. The valve body 1 is slidably arranged in the mounting chamber 6 to separate the mounting chamber 6 into a fourth oil chamber 4 and a second oil chamber 7 through the valve body 1. The fourth oil chamber 4 is located at one end of the valve body 1 away from the valve seat 16. The second oil chamber 7 is located between the valve body 1 and the valve seat 16. An L-shaped step surface 8 is formed at one end of the valve body 1 away from the valve seat 16, so that the inner surface of the shell 2 cooperates with the L-shaped step surface 8 to form a third oil chamber 9. The valve body 1 is formed with a valve body throttling hole 10, an inner and outer communicating hole 11, and an inner communicating oil passage 12. 2. The pilot valve body matching hole 13 and the valve body inner hole 14, wherein the pilot valve body matching hole 13 is used to correspond to the push rod 35 of the pilot valve 34, the second oil chamber 7 is connected with the third oil chamber 9 through the valve body throttle hole 10, the internal connecting oil passage 12 and the internal and external connecting holes 11 in sequence, the fourth oil chamber 4 is connected with the internal connecting oil passage 12 through the pilot valve body matching hole 13, and the fourth oil chamber 4 is connected with the second oil chamber 7 through the valve body inner hole 14. The housing 2 is formed with an overflow valve outlet hole 5 at a position corresponding to the second oil chamber 7, and the overflow valve outlet hole 5 is used to connect the first oil chamber 31 and the second oil chamber 7 of the shock absorber. The valve seat 16 includes a valve seat body 17, an overflow valve disc 18 and a screw (connecting piece 19), and the valve seat body 17 is formed with a screw for connecting the first oil chamber 3 and the shock absorber The relief valve seat throttling hole 28 of the first oil chamber 31 of the overflow valve, the valve seat body 17 and the relief valve disc 18 are correspondingly formed with screw mounting holes, the screw is formed with a clamping step surface, the bolt portion of the screw is arranged in the screw mounting hole, and the relief valve disc 18 is clamped by the clamping step surface of the screw and the side surface of the valve seat body 17 close to the valve body 1, the valve seat body 17 is formed with a valve seat communicating hole 20, and the relief valve disc 18 is formed with a valve disc communicating hole 21, so as to connect the first oil chamber 3 and the second oil chamber 7 through the valve seat communicating hole 20 and the valve disc communicating hole 21, and a valve body valve line 22 and an annular mounting base 23 are formed on one end of the valve body 1 close to the valve seat 16, the projection of the valve body valve line 22 on the relief valve disc 18 can surround the valve disc communicating hole 21, and the second oil The flow area between the cavity 7 and the overflow valve outlet hole 5 is positively correlated with the distance between the valve body valve line 22 and the overflow valve valve disc 18, so that the flow rate of the overflow valve outlet hole 5 is positively correlated with the distance between the valve body valve line 22 and the overflow valve valve disc 18. A spring mounting portion 24 is formed at the nut of the screw. One end of the return spring 15 is sleeved on the spring mounting portion 24, and the other end is arranged on the annular mounting base 23 to provide the valve body 1 with a force to drive it to move away from the valve seat 16. A restoring stroke throttle hole 25 is formed on the side wall of the shell 2. The inner side wall surface of the shell 2 is recessed at the position corresponding to the internal connecting oil passage 12 to cooperate with the valve body 1 to form an annular cavity 26. The first oil chamber 31 of the shock absorber is connected to the internal connecting oil passage 12 through the restoring stroke throttle hole 25 and the annular cavity 26.The outer surface of the valve body 1 is formed with an overflow valve surface oil groove 27 for connecting the annular cavity 26 and the third oil cavity 9. Figure 5 and Figure 7 As shown, when the coil assembly 33 is not energized, the flow cross-sectional area between the second oil chamber 7 and the overflow valve outlet hole 5 is the largest. At this time, the shock absorber is compressed, and the oil in the second oil chamber 32 of the shock absorber flows into the first oil chamber 3 through the reset valve assembly 36. On the one hand, the oil in the first oil chamber 3 flows from the first oil chamber 3 to the first oil chamber 31 of the shock absorber along the flow channel Q1 through the valve seat throttling hole 28, generating a compression damping force. On the other hand, the oil in the first oil chamber 3 flows along the flow channel Q2 through the valve seat connecting hole 20, the valve plate connecting hole 21 and the overflow valve outlet hole 5 in turn into the first oil chamber 31 of the shock absorber, and at this time it exhibits a compression soft mode. Figure 5 and Fig.10 As shown, at this time, the coil assembly 33 is not energized, and the shock absorber performs a recovery stroke. On the one hand, the oil in the first oil chamber 31 of the shock absorber flows along the flow channel Q5 through the valve seat throttling hole 28 from the first oil chamber 31 of the shock absorber into the first oil chamber 3, and then flows into the second oil chamber 32 of the shock absorber through the recovery valve assembly 36, generating a recovery damping force. On the other hand, the oil in the first oil chamber 31 of the shock absorber directly enters the second oil chamber 7 through the overflow valve outlet hole 5 along the flow channel Q4, and then flows through the overflow valve outlet hole 5, the valve plate connecting hole 21 and the valve seat connecting hole 20 in sequence into the first oil chamber 31 of the shock absorber, and at this time it exhibits a recovery soft mode. Figure 5 , Figure 8 and Fig. 9As shown, when the coil assembly 33 is energized, the push rod 35 is driven by the electromagnetic force to abut against the pilot valve body matching hole 13, and push the valve body 1 to move toward the valve seat 16, so that the valve body 1 abuts against the valve seat 16, and the relief valve disc 18 cooperates with the valve body valve line 22 to block the flow channel between the second oil chamber 7 and the relief valve outlet hole 5. At this time, the shock absorber is compressed, and the oil in the second oil chamber 32 of the shock absorber enters the first oil chamber 3 after passing through the restoration valve assembly 36. On the one hand, the oil in the first oil chamber 3 enters the first oil chamber 31 of the shock absorber along the flow channel Q1 through the valve seat throttling hole 28 to generate a first compression damping force, and on the other hand, it flows into the second oil chamber 7 along the flow channel Q3 through the valve seat connecting hole 20 and the valve disc connecting hole 21 in turn. Due to the blockage between the second oil chamber 7 and the relief valve outlet hole 5, the internal oil pressure of the relief valve continues to rise, and the oil passes through the valve body throttling hole 10, the internal connecting oil passage 12 and The inner and outer communicating holes 11 flow into the fourth oil chamber 9, and the oil pressure in the inner communicating oil passage 12 continues to increase until the push rod 35 is pushed open, the matching hole 13 of the pilot valve body is connected, and the oil flows into the fourth oil chamber 4 and flows back to the second oil chamber 7 through the inner hole 14 of the valve body. At this time, the valve body 1 is less subjected to the pressure of the push rod 35, so that the valve body 1 moves away from the valve seat 16 under the action of the oil pressure and the return spring 15, so that the flow cross-sectional area between the second oil chamber 7 and the overflow valve outlet hole 5 is increased, and the oil flows out from the overflow valve outlet hole 5 to form a second compression damping force. The first compression damping force and the second compression damping force together constitute the compression damping force. The overflow valve of this preferred embodiment is provided with a valve body throttling hole 10, so that the second oil chamber 7 needs to accumulate more pressure to make the inner communicating oil passage 12 have enough pressure to push the push rod 35 open, that is, the opening pressure of the valve body 1 is increased, thereby improving the bandwidth range of the compression damping. Since the oil in the third oil chamber 9 can provide pressure toward the valve seat 16 to the L-shaped step surface 8, during the process of compressing or restoring the shock absorber, the valve body 1 needs a greater force away from the valve seat 16 to push the valve body 1 open, that is, the flow cross-sectional area between the overflow valve outlet hole 5 and the second oil chamber 7 is smaller, so that the flow rate of the overflow valve outlet hole 5 is relatively reduced, which is beneficial to increase the pressure difference between the first oil chamber 31 and the second oil chamber 32 of the shock absorber, generate a greater damping force, and then increase the damping bandwidth. In addition, this embodiment is provided with an overflow valve surface oil groove 27, which is beneficial to the rapid filling of the third oil chamber 9. The overflow valve surface oil groove 27 can also reduce the contact area between the valve body 1 and the housing 2, and realize gap lubrication to reduce friction. Figure 5 , Fig.10 and Fig.11As shown, when the coil assembly 33 is energized, the shock absorber is restored. On the one hand, the oil in the first oil chamber 31 of the shock absorber flows from the valve seat throttle hole 28 along the flow channel Q5 into the first oil chamber 3, and then passes through the restoration valve assembly 36 to enter the second oil chamber 32 of the shock absorber, thereby generating a first restoring damping force. On the other hand, the oil in the first oil chamber 3 of the shock absorber flows from the housing throttle hole 25 into the annular chamber 26 along the flow channel Q6. By setting the annular chamber 26, it is ensured that the oil can flow from the housing throttle hole 25 into the internal connecting oil passage 12. The oil pressure in the internal connecting oil passage 12 continues to rise until the push rod 35 can be pushed open. The oil flows from the pilot valve body matching hole 13 into the fourth oil chamber 4, and then flows into the second oil chamber 7 through the valve body inner hole 14, and then enters the first oil chamber 3 through the valve seat connecting oil passage 37, thereby generating a second restoring damping force. After the push rod 35 is pushed open, the valve body 1 is less subjected to the pressure of the push rod 35, so that the valve body 1 moves away from the valve seat 16, and the flow cross-sectional area between the overflow valve outlet hole 5 and the second oil chamber 7 increases. The oil in the first oil chamber 31 of the shock absorber can enter the second oil chamber 7 along the flow channel Q4 through the overflow valve outlet hole 5, and then enter the first oil chamber 3, generating a third restoring damping force. The first restoring damping force, the second restoring damping force and the third restoring damping force together constitute the restoring damping force. The adjustable compression damping of this embodiment is manifested in that as the current of the coil assembly 33 increases, the force provided by the push rod 35 to the valve body 1 toward the valve seat 16 increases, and the pressure in the third oil chamber 9 increases accordingly, the valve body 1 moves toward the valve seat 16, the flow cross-sectional area between the second oil chamber 7 and the overflow valve outlet hole 5 decreases, and the flow rate of the overflow valve outlet hole 5 decreases, resulting in the pressure of the first oil chamber 3 increasing continuously during the compression stroke, that is, the pressure of the second oil chamber 32 of the shock absorber increases. In the compression process, the volume of the first oil chamber 31 of the shock absorber increases continuously, and the replenishment of oil The flow rate decreases, resulting in a decrease in the pressure of the first oil chamber 31 of the shock absorber, thereby increasing the pressure difference between the first oil chamber 31 of the shock absorber and the second oil chamber 32 of the shock absorber. Since the damping force is proportional to the pressure difference, the current of the coil assembly 33 in this embodiment increases, and the compression damping force generated by the damping variable relief valve increases. Similarly, in the recovery stroke, as the current increases, the pressure of the second oil chamber 32 of the shock absorber increases, and the pressure of the first oil chamber 31 of the shock absorber decreases, the pressure difference increases, and the damping force increases, so that the recovery damping force generated by the relief valve is proportional to the current. In addition, the housing 2 of this embodiment is formed with a housing air guide hole 29, which is used to discharge internal gas when assembling the valve core of the pilot valve 34 and assembling the coil assembly 33. The housing 2 is also formed with an overflow valve connecting thread 30 for installing the overflow valve on the recovery valve assembly 36.

[0082] On the basis of the overflow valve provided by the above technical solution of the utility model, the utility model also provides a shock absorber, which includes the above overflow valve of the present application, can provide a larger damping force, so that it can adapt to more complex working conditions and has higher adaptability and versatility.

[0083] On the basis of the shock absorber provided by the above technical solution of the utility model, the utility model also provides a vehicle, which includes the above shock absorber of the present application, and can provide a larger damping force, so that when the vehicle is driving on complex road conditions, the adhesion between the wheels and the ground is stronger, and the driving process is smoother and more comfortable.

[0084] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0085] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0086] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A relief valve, characterized in that: include: A housing (2), wherein a valve seat (16) is arranged in the housing (2), and the valve seat (16) divides the inner cavity of the housing (2) into a first oil cavity (3) and a mounting cavity (6); A valve body (1), the valve body (1) being slidably disposed in the mounting cavity (6), a second oil cavity (7) being formed between the valve body (1) and the valve seat (16), the valve seat (16) being formed with a valve seat communicating oil passage (37), the valve seat communicating oil passage (37) being used to communicate the first oil cavity (3) with the second oil cavity (7); a relief valve outlet hole (5), the relief valve outlet hole (5) being arranged on a side wall of the housing (2) corresponding to the second oil chamber (7), the valve body (1) being able to slide axially in the mounting chamber (6) to adjust a flow cross-sectional area between the second oil chamber (7) and the relief valve outlet hole (5); A third oil chamber (9) is formed between the valve body (1) and the housing (2), and the oil pressure in the third oil chamber (9) can provide a force to drive the valve body (1) to move closer to the valve seat (16). The valve body (1) is provided with a first channel, and the first channel connects the second oil chamber (7) and the third oil chamber (9).

2. The relief valve according to claim 1, characterized in that: A fourth oil chamber (4) is formed at one end of the housing (2) away from the valve seat (16), and a second channel and a pilot valve body matching hole (13) are formed on the valve body (1), wherein the second channel is used to connect the second oil chamber (7) and the fourth oil chamber (4), and the pilot valve body matching hole (13) is used to correspond to the push rod of the pilot valve so that the push rod can abut against the pilot valve body matching hole (13) to form a seal, and the third oil chamber (9) can be connected to the fourth oil chamber (4) through the pilot valve body matching hole (13).

3. The relief valve according to claim 2, characterized in that: The valve seat (16) comprises a valve seat body (17), a relief valve disc (18) and a connecting piece (19); the relief valve disc (18) is mounted on one end of the valve seat body (17) close to the valve body (1) via the connecting piece (19); the valve seat body (17) is formed with a valve seat communicating hole (20); the relief valve disc (18) is formed with a valve disc communicating hole (21); the valve seat communicating hole (20) and the valve disc communicating hole (21) cooperate to form the valve seat communicating oil passage (37); A valve body valve line (22) is formed at one end of the valve body (1) close to the overflow valve disc (18). The valve body valve line (22) can cooperate with the overflow valve disc (18) to form a seal to cut off the second oil chamber (7) and the overflow valve outlet hole (5). The valve body (1) can slide axially in the installation cavity (6) to control the distance between the overflow valve disc (18) and the valve body valve line (22) and adjust the flow cross-sectional area between the second oil chamber (7) and the overflow valve outlet hole (5).

4. The relief valve according to claim 3, characterized in that: It also comprises an elastic reset member, which is arranged in the installation cavity (6) and can provide a force to drive the valve body (1) to move away from the valve seat (16).

5. The relief valve according to claim 4, characterized in that: The elastic return member is a return spring (15); an annular mounting base (23) is formed at one end of the valve body (1) close to the valve seat body (17); a spring mounting portion (24) is formed at one end of the connecting member (19) close to the valve body (1); one end of the return spring (15) is arranged in the annular mounting base (23), and the other end is sleeved on the spring mounting portion (24).

6. The relief valve according to claim 3, characterized in that: It also comprises a throttling channel, wherein the throttling channel is used to connect the first oil chamber (3) and the overflow valve liquid outlet hole (5).

7. The relief valve according to claim 6, characterized in that: The throttling channel is a valve seat throttling hole (28) arranged on the valve seat (16).

8. The relief valve according to claim 1, characterized in that: An L-shaped step surface (8) is formed at one end of the valve body (1) away from the valve seat (16), so that the inner surface of the housing (2) cooperates with the L-shaped step surface (8) to form the third oil chamber (9).

9. The relief valve according to claim 2, characterized in that: The first passage comprises a valve body throttling hole (10), an inner and outer communicating hole (11) and an inner communicating oil passage (12); the second oil chamber (7) is connected to the third oil chamber (9) via the valve body throttling hole (10), the inner communicating oil passage (12) and the inner and outer communicating hole (11) in sequence; the inner communicating oil passage (12) is connected to the pilot valve body matching hole (13).

10. The relief valve according to claim 9, characterized in that: A housing throttle hole (25) is also formed on the side wall of the housing (2), and the housing throttle hole (25) is used to connect the internal connecting oil passage (12) with the shock absorber chamber.

11. The relief valve according to claim 10, characterized in that: The housing (2) and the valve body (1) cooperate to form an annular cavity (26), and the housing throttle hole (25) is connected to the internal connecting oil passage (12) through the annular cavity (26).

12. The relief valve according to claim 11, characterized in that: An overflow valve surface oil groove (27) is formed on the outer surface of the valve body (1), and the annular cavity (26) is connected to the third oil cavity (9) via the overflow valve surface oil groove (27).

13. A shock absorber, characterized in that: It comprises a relief valve according to any one of claims 1 to 12.

14. A vehicle, characterized in that: Comprising a vibration damper according to claim 13.

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