Hydraulic bushing and vehicle

Abstract

The invention provides a hydraulic bushing and a vehicle. The hydraulic bushing comprises a core shaft, a hydraulic cylinder and a hydraulic cylinder, the outer sleeve sleeves the outer side of the mandrel, and the outer sleeve and the mandrel are arranged at an interval; the elastic main spring is arranged between the core shaft and the outer sleeve, the elastic main spring divides the space between the core shaft and the outer sleeve into a first cavity and a second cavity which are centrosymmetric about the axis of the core shaft, and the first cavity and the second cavity are both suitable for storing damping liquid; the limiting piece extends in the circumferential direction of the mandrel and penetrates through the first cavity and the second cavity, and a damping flow channel communicating with the first cavity and the second cavity is formed in the limiting piece; and the valve assembly is arranged on the elastic main spring, and the valve assembly is configured to communicate the first cavity with the second cavity when the pressure difference between the first cavity and the second cavity reaches a threshold value. According to the hydraulic bushing, the valve assembly is integrated in the elastic main spring, so that the noise during operation can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle parts, in particular to a hydraulic bushing and a vehicle. BACKGROUND

[0002] The hydraulic bushing of the prior art is deformed by the rubber structure under high pressure and high load working conditions, a narrow passage is formed, the damping liquid flows from the high pressure chamber to the low pressure chamber, and pressure relief is achieved.

[0003] However, the rubber is prone to non-uniform deformation under high pressure and high load working conditions, and high-frequency noise is generated, affecting the user experience. SUMMARY

[0004] The present application provides a hydraulic bushing and a vehicle, by integrating a valve assembly in the elastic main spring, the valve assembly communicates the first chamber and the second chamber under high pressure and high load working conditions, the damping liquid flows from the high pressure side to the low pressure side, and the impact energy is absorbed, avoiding the formation of a passage due to the deformation of the rubber structure and the generation of high-frequency noise.

[0005] In a first aspect, the present application provides a hydraulic bushing, comprising: a core shaft; an outer sleeve, sleeved on the outside of the core shaft and spaced apart from the core shaft; an elastic main spring, arranged between the core shaft and the outer sleeve, the elastic main spring divides the space between the core shaft and the outer sleeve into a first chamber and a second chamber which are centrally symmetric about the axis of the core shaft, and the first chamber and the second chamber are suitable for storing damping liquid; a limiting piece, extending along the circumference of the core shaft and penetrating the first chamber and the second chamber, the limiting piece is provided with a damping flow channel communicating the first chamber and the second chamber; a valve assembly, arranged in the elastic main spring, the valve assembly is configured to communicate the first chamber and the second chamber when the pressure difference between the first chamber and the second chamber reaches a threshold value.

[0006] The hydraulic bushing of the present application is compressed and deformed under high pressure and high load working conditions, so that the first chamber (or the second chamber) close to the load end is compressed, the internal pressure increases, and when the pressure difference between the first chamber and the second chamber reaches a threshold value, the valve assembly communicates the first chamber and the second chamber, the damping liquid flows from the high pressure side to the pressure side, and the impact energy is absorbed. Compared with the way of forming a pressure relief passage by the large deformation of the rubber structure of the traditional bushing, the hydraulic bushing of the present application can relieve pressure when the pressure difference between the first chamber and the second chamber reaches a threshold value, which is beneficial to reduce the maximum deformation of the elastic main spring, so that the elastic main spring deforms within the elastic deformation range, and the high-frequency noise generated by the deformation of the rubber structure to form a passage is avoided.

[0007] In addition, during the axial deformation of the elastic main spring, the limiting component provides axial support to the elastic main spring, preventing excessive deformation and ensuring that the elastic main spring deforms within the elastic deformation range, which helps to extend the service life of the elastic main spring.

[0008] In some embodiments, the valve assembly includes: a mounting tube passing through the elastic main spring, the mounting tube being a hollow tubular shape; and a valve body disposed inside the mounting tube, the valve body having a connecting channel for connecting the first chamber and the second chamber, the valve body being configured to open the connecting channel when the pressure difference between the first chamber and the second chamber reaches a threshold, thereby connecting the first chamber and the second chamber. Thus, the mounting tube forms a rigid support structure, ensuring the stability of the valve body under high-pressure conditions and preventing valve body displacement due to deformation of the elastic main spring.

[0009] According to some embodiments of this application, the valve body is configured to deform when the pressure difference between the first chamber and the second chamber reaches a threshold, thereby opening the connection channel. The physical characteristics of the valve body make the opening of the connection channel controllable, avoiding the complex structure of traditional mechanical valves that rely on external actuation, and simplifying the manufacturing process of the hydraulic bushing.

[0010] According to some embodiments of this application, the valve body includes: a valve tube passing through the inner side of the mounting tube, the valve tube defining the connection channel; and a valve diaphragm disposed within the connection channel, the valve diaphragm having a slit, the valve diaphragm being adapted to deform between a first form and a second form, wherein, in the first form, the slit is open, and in the second form, the slit is closed. Thus, the slit on the valve diaphragm provides a continuously variable flow area for the valve body, allowing for a smooth transition in the damping characteristics of the hydraulic bushing, which helps to avoid the impact noise during the opening and closing of traditional valves and improves the noise reduction performance of the hydraulic bushing.

[0011] According to some embodiments of this application, the cut includes a first cut and a second cut, the first cut and the second cut extending in different directions and intersecting. By setting the intersecting first and second cuts, the valve body exhibits a smoother transition near the critical pressure difference during pressure relief. Simultaneously, the first and second cuts divide the valve diaphragm into multiple valve discs. When the cuts open, the multiple valve discs work together to expand the effective flow area of ​​the valve body, facilitating rapid pressure relief and improving the damping performance of the hydraulic bushing.

[0012] According to some embodiments of this application, the first cut and the second cut are perpendicular to each other. Thus, the first and second cuts form a symmetrical cross structure, ensuring that the valve diaphragm experiences uniform force when opened, preventing high-frequency whistling and micro-vibration due to eccentric fluid impact, thereby further improving the noise reduction effect of the hydraulic bushing.

[0013] In some embodiments, the valve tube has a first end and a second end axially opposite each other along the connecting channel. The outer wall of the first end is provided with a first limiting flange protruding radially outward along the connecting channel, and the outer wall of the second end is provided with a second limiting flange protruding radially outward along the connecting channel. The mounting tube is engaged between the first limiting flange and the second limiting flange. By providing the first and second limiting flanges on the valve tube, the assembly reliability between the mounting tube and the valve tube is improved. When the valve assembly connects the first and second chambers to release pressure, it prevents the fit between the valve tube and the mounting tube from failing under the axial impact of the damping fluid, thus improving the structural reliability of the valve assembly.

[0014] According to some embodiments of this application, along the radial direction of the connecting channel, the height of the first limiting stop is less than the wall thickness of the mounting tube, and the height of the second limiting stop is greater than the wall thickness of the mounting tube. The second limiting stop includes an extension extending radially beyond the mounting tube along the connecting channel, the extension abutting against the elastic main spring along the axial direction of the connecting channel. The wall thickness of the mounting tube is between the heights of the first and second limiting stops. Thus, during valve assembly, the mounting tube can only be inserted from the first limiting stop side, forming a foolproof design and improving assembly efficiency. Furthermore, the extension abutting against a portion of the surface of the elastic main spring along the axial direction of the connecting channel facilitates valve tube installation and positioning. Additionally, when the valve assembly connects the first and second chambers, the axial pressure of the damping fluid on the valve tube is evenly distributed onto the elastic main spring, improving the load-bearing capacity of the valve assembly and extending its service life.

[0015] According to some embodiments of this application, the outer extension segment has a pressing protrusion on the side facing the elastic main spring, and the pressing protrusion abuts against the elastic main spring. The pressing protrusion transforms the surface contact between the outer extension segment and the elastic main spring into a local point contact, increasing the unit area pressure between the outer extension segment and the elastic main spring, ensuring stable contact within the elastic deformation range of the elastic main spring, and preventing slippage between the outer extension segment and the elastic main spring due to excessive contact area.

[0016] According to some embodiments of this application, a weakening groove is provided at the first end of the sidewall of the valve tube. The weakening groove extends axially along the connecting channel, and there are multiple weakening grooves, which are spaced apart circumferentially along the connecting channel. By providing a weakening groove at the first end of the valve tube, the valve tube has the ability to shrink and deform axially. When the mounting tube is assembled with the valve tube, the first end can shrink appropriately radially, so that the first limiting stop is confined inside the mounting tube. When the mounting tube is installed in place, the first limiting stop pops out, limiting the axial movement of the mounting tube, making the assembly of the mounting tube more convenient and improving production efficiency.

[0017] According to some embodiments of this application, the elastic main spring is a rubber component, and the elastic main spring is vulcanized to the mounting tube. On the one hand, the vulcanized bond strength is much higher than that of adhesive bonding or mechanical pressing, allowing the valve assembly to withstand hydraulic pressure impacts under high pressure differentials and long-term alternating loads, thus preventing the valve assembly from detaching from the elastic main spring.

[0018] According to some embodiments of this application, the valve body is a plastic part. By making the valve body a plastic part, the geometric structure on the valve body (valve tube, valve diaphragm, first limiting stop, second limiting stop, and damping groove, etc.) can be integrally molded, reducing the number of parts and improving assembly efficiency; oil-resistant engineering plastics can be selected, which is beneficial to extending the service life of the valve body in the damping fluid environment.

[0019] According to some embodiments of this application, there are two valve assemblies. One of the two valve assemblies is used to allow the damping fluid in the first chamber to flow unidirectionally to the second chamber, and the other is used to allow the damping fluid in the second chamber to flow unidirectionally to the first chamber. By setting two valve assemblies with opposite conduction directions, the hydraulic bushing can adapt to load impacts from multiple directions (such as vehicle acceleration, braking, left turn, or right turn), and the valve assemblies can open in a timely manner to relieve pressure.

[0020] Secondly, embodiments of this application also provide a vehicle including the aforementioned hydraulic bushing.

[0021] In the vehicle described in this application, the valve assembly of the hydraulic bushing allows the first and second chambers to connect and release pressure during vehicle operation. This prevents the rubber structure from forming a channel for pressure release through extensive deformation, reduces noise during the use of the hydraulic bushing, and helps improve user satisfaction. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0023] Figure 1This is a schematic diagram of the structure of the hydraulic bushing according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure inside the outer tube according to an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the elastic main spring mounted on the mandrel according to an embodiment of this application;

[0026] Figure 4 This is a cross-sectional view of the hydraulic bushing according to an embodiment of this application;

[0027] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 This is a schematic diagram of the structure of the limiting member according to an embodiment of this application;

[0029] Figure 7 This is a cross-sectional view of the valve body according to an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the valve diaphragm in a first state according to an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of the valve diaphragm in the second state according to an embodiment of this application.

[0032] Figure label:

[0033] 100-Hydraulic bushing;

[0034] 10-Mandrel;

[0035] 20-Outer tube;

[0036] 30 - Elastic main spring; 31 - First chamber; 32 - Second chamber;

[0037] 40 - Limiting element; 41 - Damping flow channel;

[0038] 50 - Valve assembly; 51 - Mounting pipe; 52 - Valve body; 521 - Connection channel; 522 - Valve pipe; 522a - First end; 522b - Second end; 5221 - First limiting stop; 5222 - Second limiting stop; 5222a - Outer extension; 5222b - Pressing protrusion; 5223 - Weakening groove;

[0039] 523 - Valve diaphragm; 5231 - Incision; 5231a - First incision; 5231b - Second incision.

[0040] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0042] Existing hydraulic bushings achieve pressure relief by deforming the rubber structure under high pressure and high load conditions to create narrow channels, allowing damping fluid to flow from the high-pressure chamber to the pressure-reducing chamber.

[0043] However, rubber is prone to non-uniform deformation under high pressure and high load conditions, which in turn generates high-frequency noise and affects the user experience.

[0044] In view of this, the present application provides a hydraulic bushing and vehicle, which integrates a valve assembly in the elastic main spring. Under high pressure and high load conditions, the valve assembly connects the first chamber and the second chamber, and the damping fluid flows from the high pressure side to the low pressure side to absorb impact energy, thus avoiding high-frequency noise caused by the formation of channels due to the deformation of the rubber structure.

[0045] refer to Figures 1 to 9 In a first aspect, embodiments of this application provide a hydraulic bushing 100, which includes a spindle 10, an outer sleeve 20, an elastic main spring 30, a limiting member 40, and a valve assembly 50.

[0046] The spindle 10 is the inner support structure of the hydraulic bushing 100, used for fixed connection with external connecting components (such as control arms or subframes) and to withstand dynamic loads from the outside. The outer circumferential surface of the spindle 10 provides an mounting reference for the elastic main spring 30.

[0047] The outer sleeve 20 is sleeved on the outside of the spindle 10 and spaced apart from the spindle 10. The outer sleeve 20 forms the outer contour structure of the hydraulic bushing 100 and is fixedly connected to the vehicle body or bracket.

[0048] A flexible main spring 30 is disposed between the spindle 10 and the outer sleeve 20, dividing the space between the spindle 10 and the outer sleeve 20 into a first chamber 31 and a second chamber 32. The first chamber 31 and the second chamber 32 are centrally symmetrical about the axis of the spindle 10. Exemplarily, an annular space is formed between the outer sleeve 20 and the spindle 10. The flexible main spring 30 may have two partition structures arranged radially symmetrically along the spindle 10. One end of the partition structure is attached to the outer wall of the spindle 10 on the inner side of the annular space, and the other end of the partition structure extends to the outer side of the annular space and is attached to the inner wall of the outer sleeve 20. The spaces of the two partition structures in the clockwise and counterclockwise directions are the first chamber 31 and the second chamber 32, respectively. Alternatively, the elastic main spring 30 can be a cylindrical structure that fills the space between the outer sleeve 20 and the spindle 10. A portion of the structure on the outer wall of the elastic main spring 30 is recessed toward the spindle 10 to form a first chamber 31. A second chamber 32 is formed by recesses on the outer wall of the elastic main spring 30 at a position symmetrical to the first chamber 31 along the spindle 10.

[0049] Both the first chamber 31 and the second chamber 32 are suitable for storing damping fluid. The damping fluid generates controllable damping by flowing between the first chamber 31 and the second chamber 32, converting vibration energy into heat energy and dissipating it, thereby achieving vibration reduction.

[0050] refer to Figure 2 , Figure 3 and Figure 6 The limiting member 40 extends circumferentially along the spindle 10 and passes through the first chamber 31 and the second chamber 32. When the elastic main spring 30 is compressed and deformed, the limiting member 40 provides support to the elastic main spring 30, preventing excessive deformation and extending its service life. Simultaneously, it also prevents excessive deformation of the elastic main spring 30, which could lead to uneven stress and abnormal noise during hydraulic bushing 100 operation.

[0051] The limiting member 40 is provided with a damping flow channel 41 that connects the first chamber 31 and the second chamber 32. In other words, part of the structure of the limiting member 40 forms a flow channel for the damping fluid, providing a flow path with controllable direction for the damping fluid. This helps to avoid turbulence noise and material fatigue caused by narrow gaps formed by the compression of the rubber structure in traditional solutions.

[0052] refer to Figure 1 , Figure 2 and Figure 3 The valve assembly 50 is disposed on the elastic main spring 30. The valve assembly 50 is configured to connect the first chamber 31 and the second chamber 32 when the pressure difference between the first chamber 31 and the second chamber 32 reaches a threshold. That is, a conduction channel is provided between the first chamber 31 and the second chamber 32, and the valve assembly 50 is disposed in the conduction channel.

[0053] During vehicle operation, the hydraulic bushing 100 is subjected to load and deforms, causing changes in the volume of the first chamber 31 and the second chamber 32, and altering the internal pressure. When the pressure difference between the first chamber 31 and the second chamber 32 does not reach a set threshold, the valve assembly 50 remains closed, and the damping fluid flows between the first chamber 31 and the second chamber 32 only through the damping flow channel 41. When the vehicle experiences an impact or high-load conditions, causing the pressure difference between the first chamber 31 and the second chamber 32 to exceed the threshold, the valve assembly 50 opens, establishing a fluid passage and achieving rapid pressure relief. This avoids the elastic main spring 30 being forced to undergo large deformation under extreme conditions to form a pressure relief channel, thereby eliminating the source of abnormal noise or even damage caused by forced compression deformation of the rubber structure.

[0054] The valve assembly 50 can be an electrically controlled valve with an integrated pressure sensor, or it can be a diaphragm differential pressure valve, or it can be a piston differential pressure valve. The piston structure is movably installed in the flow passage of the valve body through an elastic element. When the pressure on one side (one of the first chamber 31 or the second chamber 32) exceeds the threshold, the piston moves to open the flow passage, so that the first chamber 31 and the second chamber 32 are connected.

[0055] In the hydraulic bushing 100 of this application, the elastic main spring 30 is compressed and deformed during use, causing the first chamber 31 (or the second chamber 32) near the load end to be compressed, increasing the internal pressure. When the pressure difference between the first chamber 31 and the second chamber 32 reaches a threshold, the valve assembly 50 connects the first chamber 31 and the second chamber 32, and the damping fluid flows from the high-pressure side to the low-pressure side, absorbing the impact energy. Compared with the traditional bushing method where the rubber structure undergoes large deformation to form a pressure relief channel, the hydraulic bushing 100 of this application can relieve pressure when the pressure difference between the first chamber 31 and the second chamber 32 reaches the threshold. This helps to reduce the maximum deformation of the elastic main spring 30, allowing the elastic main spring 30 to deform within the elastic deformation range. This avoids high-frequency noise caused by the formation of channels due to rubber structure deformation, and reduces damage caused by excessive deformation of the elastic main spring 30.

[0056] In addition, during the deformation of the elastic main spring 30, the limiting member 40 supports the elastic main spring 30, preventing the elastic main spring 30 from deforming excessively and ensuring that the elastic main spring 30 deforms within the elastic deformation range, which is beneficial to extending the service life of the elastic main spring 30.

[0057] refer to Figure 4 , Figure 5 and Figure 7In some embodiments, the valve assembly 50 includes a mounting tube 51 and a valve body 52. ​​The mounting tube 51 passes through the elastic main spring 30 and is hollow. The mounting tube 51 provides reliable mechanical support and a sealed installation environment for the valve body 52, preventing the valve body 52 from shifting or loosening under high pressure pulsation.

[0058] The valve body 52 is located inside the mounting tube 51. The valve body 52 has a connecting channel 521 for connecting the first chamber 31 and the second chamber 32. The valve body 52 is configured to open the connecting channel 521 when the pressure difference between the first chamber 31 and the second chamber 32 reaches a threshold, thereby connecting the first chamber 31 and the second chamber 32. Exemplarily, the valve body 52 may contain an elastic diaphragm, or an opening / closing plate that can be rotatably mounted within the valve body 52 via an elastic preload member. When the pressure difference between the first chamber 31 and the second chamber 32 reaches the threshold, the diaphragm opens, or the opening / closing plate flips to open the connecting channel 521, which helps improve the response efficiency of the valve assembly 50.

[0059] According to some embodiments of this application, the valve body 52 is configured to deform when the pressure difference between the first chamber 31 and the second chamber 32 reaches a threshold, thereby opening the connection channel 521. Exemplarily, the valve body 52 may contain an elastic diaphragm. When the pressure difference between the two sides of the diaphragm (the first chamber 31 and the second chamber 32) reaches the threshold, the diaphragm deforms and opens towards the lower pressure side, allowing the first chamber 31 and the second chamber 32 to communicate. Alternatively, one axial end of the valve body 52 may be configured as an elastic horn-shaped structure. When the pressure inside the elastic horn-shaped structure does not exceed the threshold, the end of the elastic horn-shaped structure facing away from the valve body 52 is closed. When the pressure inside the elastic horn-shaped structure exceeds the threshold, the elastic horn-shaped structure opens, allowing the first chamber 31 and the second chamber 32 to communicate.

[0060] Thus, by utilizing the physical characteristics of the valve body 52, the opening of the connection channel 521 becomes controllable, avoiding the complex structure of traditional mechanical valves that rely on external drives, which helps to simplify the manufacturing process of the hydraulic bushing 100.

[0061] refer to Figure 5 , Figure 7 , Figure 8 and Figure 9 According to some embodiments of this application, the valve body 52 includes a valve tube 522 and a valve diaphragm 523.

[0062] The valve tube 522 is inserted inside the mounting tube 51, and the valve tube 522 defines the connection channel 521. The two ends of the valve tube 522 are in fluid communication with the first chamber 31 and the second chamber 32 respectively, providing a potential passage for the damping fluid to pass through the two chambers.

[0063] The valve diaphragm 523 is located in the connection channel 521 and is used to dynamically control the on / off state of the channel.

[0064] The valve diaphragm 523 has a slit 5231, which is adapted to deform between a first state and a second state. In the first state, the slit 5231 is open, and in the second state, the slit 5231 is closed. That is, in the second state, the valve diaphragm 523, due to its own material tension or prestress, tightly fits the edge of the slit 5231, and the connecting channel 521 is closed. When the pressure difference between the first chamber 31 and the second chamber 32 reaches a threshold, the hydraulic pressure acting on both sides of the valve diaphragm 523 overcomes the elastic force of the valve diaphragm 523, causing the valve diaphragm 523 to bulge or stretch, entering the first state. The slit 5231 is opened, forming a flow gap, thereby opening the connecting channel 521. After the external load decreases, the valve diaphragm 523 elastically returns to the second state, and the slit 5231 closes again.

[0065] Thus, the cutout 5231 on the valve diaphragm 523 provides a continuously variable flow area for the valve body 52, which makes the damping characteristics of the hydraulic bushing 100 transition smoothly. This helps to avoid the impact noise at the moment of opening and closing of traditional valves and improves the noise reduction performance of the hydraulic bushing 100.

[0066] refer to Figure 7 , Figure 8 and Figure 9 According to some embodiments of this application, the cut 5231 includes a first cut 5231a and a second cut 5231b, the first cut 5231a and the second cut 5231b extending in different directions respectively, and the first cut 5231a and the second cut 5231b intersecting. For example, the first cut 5231a and the second cut 5231b can be formed as a V shape, or the first cut 5231a and the second cut 5231b can also be formed as a Y shape, or the first cut 5231a and the second cut 5231b can also be formed as an X shape, or the first cut 5231a and the second cut 5231b can also be formed as a cross shape.

[0067] By setting intersecting first cut 5231a and second cut 5231b, the valve body 52 exhibits a smoother transition near the critical pressure difference during pressure relief. At the same time, the first cut 5231a and second cut 5231b divide the valve diaphragm 523 into multiple valve discs. When the cut 5231 opens, the multiple valve discs work together to expand the effective flow area of ​​the valve body 52, which is beneficial for rapid pressure relief and improves the damping performance of the hydraulic bushing 100.

[0068] refer to Figure 8 and Figure 9According to some embodiments of this application, the first cut 5231a and the second cut 5231b are perpendicular to each other. Thus, the first cut 5231a and the second cut 5231b form a symmetrical cross structure, and the valve diaphragm 523 forms four symmetrically distributed elastic valve flaps. When the valve diaphragm 523 deforms into the first shape, the four valve flaps fold simultaneously from the center outwards, allowing the damping fluid to flow uniformly. This prevents high-frequency whistling and micro-vibration due to eccentric impact from the fluid, further improving the noise reduction effect of the hydraulic bushing 100. Furthermore, the formation of a maximum stress concentration point at the center of the valve diaphragm 523 allows for a lower opening pressure threshold than a single cut or non-orthogonal cut, achieving the same material thickness and improving the responsiveness of the hydraulic bushing 100.

[0069] Understandably, in this embodiment, even when the valve diaphragm 523 is in the second state, the cut 5231 on the valve diaphragm 523 forms a microchannel, through which a small amount of damping fluid can flow between the first chamber 31 and the second chamber 32. That is to say, in the second state, the valve diaphragm 523 does not strictly close the connection channel 521.

[0070] refer to Figure 5 and Figure 7 In some embodiments, the valve tube 522 has a first end 522a and a second end 522b that are axially opposite to each other along the connecting channel 521. The outer wall of the first end 522a is provided with a first limiting flange 5221 that protrudes radially outward along the connecting channel 521, and the outer wall of the second end 522b is provided with a second limiting flange 5222 that protrudes radially outward along the connecting channel 521. The mounting tube 51 is engaged between the first limiting flange 5221 and the second limiting flange 5222, thereby restricting the axial movement of the valve tube 522 relative to the mounting tube 51.

[0071] By setting a first limiting stop 5221 and a second limiting stop 5222 on the valve tube 522, it is beneficial to improve the assembly reliability between the mounting tube 51 and the valve tube 522, prevent the valve tube 522 from axially moving or coming out under the large deformation condition of the elastic main spring 30, and ensure that the valve diaphragm 523 is always in the designed working position.

[0072] When the valve assembly 50 connects the first chamber 31 and the second chamber 32 to release pressure, it prevents the failure of the fit between the valve pipe 522 and the mounting pipe 51 under the axial impact of the damping fluid, which helps to improve the structural reliability of the valve assembly 50.

[0073] refer to Figure 5According to some embodiments of this application, along the radial direction of the connecting channel 521, the height of the first limiting stop 5221 is less than the wall thickness of the mounting tube 51, and the height of the second limiting stop 5222 is greater than the wall thickness of the mounting tube 51. When assembling the valve assembly 50, the mounting tube 51 can only be inserted from the first limiting stop 5221 side, forming a foolproof design, which is beneficial to improving assembly efficiency. At the same time, the height of the second limiting stop 5222 being greater than the wall thickness of the mounting tube 51 also forms a limiting structure, preventing the valve tube 522 from excessively penetrating into the mounting tube 51 axially.

[0074] The second limiting stop 5222 includes an extension 5222a extending radially beyond the mounting tube 51 along the connecting channel 521. The extension 5222a abuts against the elastic main spring 30 along the axial direction of the connecting channel 521. On the one hand, this facilitates the installation and positioning of the valve tube 522. On the other hand, when the valve assembly 50 connects the first chamber 31 and the second chamber 32, it evenly distributes the axial pressure of the damping fluid on the valve tube 522 onto the elastic main spring 30, which helps to improve the load-bearing capacity of the valve assembly 50 and also extends the service life of the valve assembly 50.

[0075] Continue to refer to Figure 5 According to some embodiments of this application, the outer extension 5222a has a pressing protrusion 5222b on the side facing the elastic main spring 30, and the pressing protrusion 5222b abuts against the elastic main spring 30.

[0076] The pressing protrusion 5222b transforms the surface contact between the extension segment 5222a and the elastic main spring 30 into a local point contact, increasing the unit area pressure between the extension segment 5222a and the elastic main spring 30, ensuring stable contact within the elastic deformation range of the elastic main spring 30, and preventing slippage between the extension segment 5222a and the elastic main spring 30 due to excessive contact area.

[0077] refer to Figure 5 and Figure 7 According to some embodiments of this application, a weakening groove 5223 is provided at the first end 522a of the sidewall of the valve pipe 522. The weakening groove 5223 extends axially along the connecting channel 521, and there are multiple weakening grooves 5223 (e.g., two, three, or more arranged circumferentially along the connecting channel 521). The multiple weakening grooves 5223 are arranged circumferentially along the connecting channel 521. By providing a weakening groove 5223 at the first end 522a of the valve pipe 522, the valve pipe 522 has the ability to shrink and deform axially. When the mounting pipe 51 is assembled with the valve pipe 522, the first end 522a can shrink appropriately radially, so that the first limiting stop 5221 is confined inside the mounting pipe 51. When the mounting pipe 51 is installed in place, the first limiting stop 5221 pops out, limiting the axial movement of the mounting pipe 51, making the assembly of the mounting pipe 51 more convenient and improving production efficiency.

[0078] According to some embodiments of this application, the elastic main spring 30 is a rubber component. For example, the elastic main spring 30 may include at least one of natural rubber NR, styrene-butadiene rubber SBR, ethylene propylene diene monomer rubber EPDM, or hydrogenated nitrile butadiene rubber HNBR, so that the elastic main spring 30 has high elasticity, damping energy dissipation, and large deformation capacity.

[0079] The elastic main spring 30 is vulcanized and connected to the mounting tube 51. Specifically, during assembly, the mounting tube 51 is pre-inserted into the mold used to process the elastic main spring 30 as an insert. Then, unvulcanized rubber compound is injected and heated and pressurized, so that the rubber forms a strong bonding interface with the surface of the mounting tube 51 during the curing (vulcanization) process. On the one hand, the vulcanized bond strength is much higher than that of adhesive or mechanical pressing, allowing the valve assembly 50 to withstand hydraulic pressure impacts under high pressure differentials and long-term alternating loads, preventing the valve assembly 50 from detaching from the elastic main spring 30.

[0080] According to some embodiments of this application, the valve body 52 is a plastic part. By making the valve body 52 a plastic part, the geometry on the valve body 52 (valve pipe 522, valve diaphragm 523, first limiting stop 5221, second limiting stop 5222, and damping groove 5223, etc.) can be integrally molded, reducing the number of parts and improving assembly efficiency; oil-resistant engineering plastics can be selected, which is beneficial to extending the service life of the valve body 52 in the damping fluid environment.

[0081] According to some embodiments of this application, there are two valve assemblies 50. One of the two valve assemblies 50 is used to allow the damping fluid in the first chamber 31 to flow unidirectionally to the second chamber 32, and the other is used to allow the damping fluid in the second chamber 32 to flow unidirectionally to the first chamber 31. By setting two valve assemblies 50 with opposite conduction directions, the hydraulic bushing 100 can adapt to load impacts from multiple directions (such as vehicle acceleration, braking, left turn, or right turn), and the valve assembly 50 can open in time to relieve pressure.

[0082] Secondly, embodiments of this application also provide a vehicle including the aforementioned hydraulic bushing 100.

[0083] Specifically, the hydraulic bushing 100 may be installed in at least one of the vehicle's suspension system, subframe connection point, control arm mounting point, or powertrain mount.

[0084] Hydraulic bushing 100, as an elastic connecting element, is installed between two relatively moving parts on the vehicle (such as the subframe and the body, the lower control arm and the subframe, etc.) to transmit loads while isolating vibrations and impacts.

[0085] During vehicle operation, road surface excitation or powertrain vibration causes relative displacement between connecting components, resulting in deformation of the elastic main spring 30. This, in turn, creates a pressure difference between the first chamber 31 and the second chamber 32 inside the hydraulic bushing 100. When the pressure difference is small, the damping fluid flows slowly through the fixed damping channel 41 in the limiting member 40, providing basic damping. When encountering speed bumps, potholes, or high-load conditions such as rapid acceleration / braking, the valve assembly 50 automatically opens, enabling rapid pressure relief from the high-pressure chamber to the low-pressure chamber, effectively suppressing instantaneous force transmission peaks.

[0086] In the vehicle described in this application, due to the use of the aforementioned hydraulic bushing 100, the valve assembly 50 of the hydraulic bushing 100 connects the first chamber 31 and the second chamber 32 to release pressure during vehicle operation. This avoids the rubber structure forming a channel for pressure release through extensive deformation, reduces the noise of the hydraulic bushing 100 during use, and helps improve user satisfaction.

[0087] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A hydraulic bushing, characterized in that, include: mandrel; An outer sleeve is fitted over the outside of the mandrel and spaced apart from the mandrel; An elastic main spring is disposed between the mandrel and the outer sleeve. The elastic main spring divides the space between the mandrel and the outer sleeve into a first chamber and a second chamber that are centrally symmetrical about the axis of the mandrel. Both the first chamber and the second chamber are suitable for storing damping fluid. A limiting member extends circumferentially along the mandrel and passes through the first chamber and the second chamber, and the limiting member is provided with a damping flow channel connecting the first chamber and the second chamber; A valve assembly is disposed on the elastic main spring, the valve assembly being configured to connect the first chamber and the second chamber when the pressure difference between the first chamber and the second chamber reaches a threshold.

2. The hydraulic bushing according to claim 1, characterized in that, The valve assembly includes: An installation tube is inserted through the elastic main spring, and the installation tube is hollow in shape. A valve body is disposed inside the mounting pipe. The valve body has a connecting channel for connecting the first chamber and the second chamber. The valve body is configured to open the connecting channel when the pressure difference between the first chamber and the second chamber reaches a threshold, so as to connect the first chamber and the second chamber.

3. The hydraulic bushing according to claim 2, characterized in that, The valve body is configured to deform when the pressure difference between the first chamber and the second chamber reaches a threshold, thereby opening the connection channel.

4. The hydraulic bushing according to claim 3, characterized in that, The valve body includes: A valve tube is inserted inside the mounting tube, and the valve tube defines the connection channel; A valve diaphragm is disposed within the connection channel, and the valve diaphragm has a slit. The valve diaphragm is adapted to deform between a first form and a second form, wherein the slit is open in the first form and closed in the second form.

5. The hydraulic bushing according to claim 4, characterized in that, The incision includes: The first incision and the second incision extend in different directions and intersect.

6. The hydraulic bushing according to claim 5, characterized in that, The first incision and the second incision are perpendicular to each other.

7. The hydraulic bushing according to claim 4, characterized in that, The valve tube has a first end and a second end that are axially opposite each other along the connecting channel. The outer wall of the first end is provided with a first limiting stop that protrudes radially outward along the connecting channel. The outer wall of the second end is provided with a second limiting stop that protrudes radially outward along the connecting channel. The installation tube is positioned between the first limiting stop and the second limiting stop.

8. The hydraulic bushing according to claim 7, characterized in that, Along the radial direction of the connecting channel, the height of the first limiting stop is less than the wall thickness of the mounting tube, and the height of the second limiting stop is greater than the wall thickness of the mounting tube. The second limiting stop includes an extension that extends radially beyond the mounting tube along the connecting channel, and the extension abuts against the elastic main spring along the axial direction of the connecting channel.

9. The hydraulic bushing according to claim 8, characterized in that, The outer extension has a pressing protrusion on the side facing the elastic main spring, and the pressing protrusion abuts against the elastic main spring.

10. The hydraulic bushing according to claim 8, characterized in that, The first end of the sidewall of the valve pipe is provided with a weakening groove, which extends along the axial direction of the connecting channel. There are multiple weakening grooves, which are spaced apart circumferentially along the connecting channel.

11. The hydraulic bushing according to claim 2, characterized in that, The elastic main spring is a rubber component, and the elastic main spring is vulcanized and connected to the mounting tube.

12. The hydraulic bushing according to claim 2, characterized in that, The valve body is made of plastic.

13. The hydraulic bushing according to claim 2, characterized in that, The valve assembly comprises two valves, one of which is used to allow the damping fluid in the first chamber to flow unidirectionally to the second chamber, and the other is used to allow the damping fluid in the second chamber to flow unidirectionally to the first chamber.

14. A vehicle, characterized in that, Includes the hydraulic bushing as described in any one of claims 1-13.

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