An axial subframe hydraulic bushing assembly

Abstract

The present invention discloses an axial subframe hydraulic bushing assembly, relating to the technical field of automotive parts. The assembly comprises an upper hydraulic seal main spring assembly and a lower liquid resistance seal main spring assembly, as well as a flow channel assembly. The upper hydraulic seal main spring assembly and the lower liquid resistance seal main spring assembly are combined to form an inner cavity. The flow channel assembly is disposed within the inner cavity and divides the inner cavity into an upper liquid chamber and a lower liquid chamber, and a flow channel is provided within the flow channel assembly for connecting the upper and lower liquid chambers. The upper and lower liquid chambers and the flow channel are filled with damping fluid. The present invention utilizes several modular assemblies to fully integrate the liquid chamber flow channel portion of the bushing into the main spring body, thereby better achieving the hydraulic characteristics required axially for the bushing.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, in particular to an axial subframe hydraulic bushing assembly. Background Art

[0002] With the development of the automotive industry and the increasing popularity of cars, people's demands for a car's driving experience have expanded from the initial focus on handling stability to include ride comfort. Especially in new energy vehicles, which lack the vibration source of traditional fuel-powered powertrains, road vibration excitation has become the primary factor affecting ride comfort. This also places higher demands on the NVH performance of automotive suspension systems. Bushings are key components in automotive suspension systems that determine handling stability and ride comfort, making in-depth research on these components crucial. Compared to the linear dynamic characteristics of traditional rubber bushings, hydraulic bushings have nonlinear dynamic characteristics. They can provide a large damping hysteresis angle within a certain frequency range, effectively attenuating vibrations; or they can provide low dynamic stiffness within a certain frequency range, reducing the vibration transmission rate and thus reducing noise. Precisely due to these excellent performance characteristics, hydraulic bushings are increasingly used in automobiles.

[0003] Traditional hydraulic bushings, due to structural limitations, typically provide radial fluid resistance, leading to their widespread use at suspension control arm joints. Subframe bushings, however, serve as the third-level vibration damping system in the chassis suspension, targeting vibration sources including the fore-aft resonance of the suspension's front-to-back compliance and the vertical unsprung resonance. Due to subframe layout constraints and comprehensive performance considerations such as handling stability, subframe bushings are currently primarily arranged axially. However, due to the bushing's inherent structure, a truly axial hydraulic bushing has yet to be developed. (Although patent documents "Subframe Axial Hydraulic Bushing," CN201810770946.4, and "A Rear Subframe Axial Hydraulic Bushing and Automobile Rear Subframe Assembly," CN201921179646.5, disclose an axial hydraulic bushing, the main hydraulic component is located outside the bushing's main spring, and the bushing only has a throttle plate but no flow channel. Essentially, the damping force is generated through fluid viscous friction, not based on the principle of liquid column resonance. The damping angle provided is limited, and it lacks widespread application.) However, through technical exchanges with various OEMs, our company has recognized that an increasing number of OEMs are focusing on the dynamic characteristics of subframe bushings in the axial direction. Against this backdrop, a truly axial hydraulic bushing structure is needed that offers excellent axial fluid resistance while also taking into account the product's structural and manufacturing process characteristics. Summary of the Invention

[0004] In response to the defects existing in the prior art, the purpose of the present invention is to provide an axial subframe hydraulic bushing assembly, which uses several modular assemblies to completely integrate the liquid chamber flow channel part of the bushing into the main spring body, so as to better realize the hydraulic characteristics required in the axial direction of the bushing.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is: an axial subframe hydraulic bushing assembly, including an upper hydraulic sealing main spring assembly and a lower liquid resistance sealing main spring assembly, and also including a flow channel assembly; the upper hydraulic sealing main spring assembly and the lower liquid resistance sealing main spring assembly are combined to form an inner cavity; the flow channel assembly is arranged in the inner cavity and divides it into an upper liquid chamber and a lower liquid chamber, and a flow channel for connecting the upper liquid chamber and the lower liquid chamber is arranged in the flow channel assembly; the upper liquid chamber, the lower liquid chamber and the flow channel are filled with damping fluid.

[0006] Based on the above technical solution, the upper hydraulic sealing main spring assembly includes an outer tube, an inner liner and a first rubber body; the inner liner is a cylindrical structure and is arranged in the upper end opening of the outer tube; the first rubber body includes a rubber layer vulcanized on the inner side of the outer tube, a rubber block vulcanized and connected to the inner liner, and a first rubber membrane structure for connecting the rubber layer and the rubber block; the rubber layer is located in the middle of the outer tube and is provided with a first limiting protrusion adapted to the flow channel assembly.

[0007] On the basis of the above technical solution, the upper end opening of the outer tube is bent outward to form a first flange portion, a barb structure is provided at the lower end opening of the outer tube, and reinforcing ribs are provided on the outer wall of the outer tube along the circumferential direction; the first rubber body is located at a position opposite to the first flange portion and has two first bosses provided; the first rubber membrane structure is provided at a position opposite to the first boss and has a first thickened portion.

[0008] Based on the above technical solution, the middle part of the liner is an interference fitting section that is compatible with the lower liquid resistance seal main spring assembly, and the two ends of the liner are expanded outward to form an avoidance portion; the rubber block is vulcanized on the outside of the interference fitting section and wraps the avoidance portion, and the part of the rubber block located inside the avoidance portion is provided with a second limiting protrusion that is compatible with the lower liquid resistance seal main spring assembly.

[0009] On the basis of the above technical solution, the lower hydraulic resistance sealing main spring assembly includes an inner tube and a lower liner ring, the lower liner ring is arranged on the outside of the lower end opening of the inner tube, and a second rubber body is vulcanized between the lower liner ring and the inner tube; second bosses are arranged on both sides of the lower end of the inner tube, and the outer side of the second boss is a slope; the lower liner ring includes a first ring body, and the inner wall of the center hole of the first ring body is a slope adapted to the second boss; the side of the first ring body is provided with a first limiting groove for preventing the upper hydraulic sealing main spring assembly from falling out; third bosses are arranged on both sides of the top surface of the first ring body.

[0010] On the basis of the above technical solution, the upper end opening of the inner tube is a mounting hole, and a card slot is relatively arranged in the mounting hole; a chamfer is provided at the lower end edge of the inner tube; the part of the second rubber body located between the lower liner ring and the second boss is a second rubber membrane structure, and the part of the second rubber body located between the lower liner ring and the inner tube is a second thickened part.

[0011] On the basis of the above technical solution, it also includes a limiting cover plate, wherein a through hole adapted to the mounting hole is provided in the middle of the limiting cover plate, and claws adapted to the slot are relatively provided in the through hole; groove portions are relatively provided on both sides of the limiting cover plate; and a second flange portion is provided on the edge of the limiting cover plate.

[0012] On the basis of the above technical solution, the flow channel assembly includes a flow channel body, a flow channel upper cover plate and a rubber limiting ring; the flow channel body includes a second ring body, the top surface of the second ring body is provided with a liquid flow channel groove, and the bottom surface of the second ring body is provided with a first flow hole for connecting the liquid flow channel groove and the lower liquid chamber; the flow channel upper cover plate includes a third ring body, the third ring body is buckled on the top surface of the second ring body, and the bottom surface of the third ring body is provided with a fourth boss adapted to the liquid flow channel groove, and the fourth boss is provided with a second flow hole for connecting the liquid flow channel groove and the upper liquid chamber; the rubber limiting ring is arranged on the outside of the connection between the second ring body and the third ring body.

[0013] On the basis of the above technical solution, the bottom surface of the second ring body is located at the edge of the inner hole and is provided with a first limiting portion for supporting the lower liquid resistance sealing main spring assembly, and the outer side surface of the second ring body is provided with a first limiting step adapted to the rubber limiting ring; the top surface of the third ring body is located at the edge of the inner hole and is provided with a second limiting portion for supporting the upper hydraulic sealing main spring assembly, and the outer side surface of the third ring body is provided with a second limiting step adapted to the rubber limiting ring; the outer circular surface of the rubber limiting ring is provided with a third limiting protrusion adapted to the first limiting protrusion.

[0014] On the basis of the above technical solution, the first limiting protrusion is in an eight-shaped structure.

[0015] The beneficial effects of the present invention are:

[0016] The present invention utilizes several modular assemblies to completely integrate the liquid chamber flow channel portion of the bushing into the main spring body, thereby better realizing the hydraulic characteristics required in the axial direction of the bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A top view of an axial subframe hydraulic bushing assembly according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Cross-sectional view along the AA axis;

[0019] Figure 3 for Figure 1 Cross-sectional view along the BB direction;

[0020] Figure 4 A top view of the upper hydraulic seal main spring assembly in an embodiment of the present invention;

[0021] Figure 5 for Figure 4 Cross-sectional view in CC direction;

[0022] Figure 6 for Figure 4 Cross-sectional view in the middle DD direction;

[0023] Figure 7 A perspective view of an upper hydraulic seal main spring assembly according to an embodiment of the present invention;

[0024] Figure 8 is a three-dimensional diagram of the outer tube in an embodiment of the present invention;

[0025] Figure 9 is a cross-sectional view of the outer tube in an embodiment of the present invention;

[0026] Figure 10 is a three-dimensional diagram of the liner in an embodiment of the present invention;

[0027] Figure 11 is a cross-sectional view of the liner in an embodiment of the present invention;

[0028] Figure 12 A three-dimensional diagram of a flow channel assembly according to an embodiment of the present invention;

[0029] Figure 13 is a cross-sectional view of a flow channel assembly according to an embodiment of the present invention;

[0030] Figure 14 A three-dimensional diagram of the flow channel body in an embodiment of the present invention;

[0031] Figure 15 is a top view of the flow channel body in an embodiment of the present invention;

[0032] Figure 16 is a cross-sectional view of the flow channel body in an embodiment of the present invention;

[0033] Figure 17 A three-dimensional diagram of the flow channel upper cover plate in an embodiment of the present invention;

[0034] Figure 18 is a cross-sectional view of the flow channel upper cover plate in an embodiment of the present invention;

[0035] Figure 19 A three-dimensional diagram of a rubber limiting ring in an embodiment of the present invention;

[0036] Figure 20is a cross-sectional view of a rubber limiting ring in an embodiment of the present invention;

[0037] Figure 21 A top view of the lower hydraulic seal main spring assembly in an embodiment of the present invention;

[0038] Figure 22 for Figure 21 Cross-sectional view along the EE direction;

[0039] Figure 23 for Figure 21 Cross-sectional view in the FF direction;

[0040] Figure 24 A perspective view of a lower hydraulic seal main spring assembly according to an embodiment of the present invention;

[0041] Figure 25 is a three-dimensional diagram of the inner tube in an embodiment of the present invention;

[0042] Figure 26 is a top view of the inner tube in an embodiment of the present invention;

[0043] Figure 27 is a cross-sectional view of an inner tube in an embodiment of the present invention;

[0044] Figure 28 A top view of the lower backing ring in an embodiment of the present invention;

[0045] Figure 29 for Figure 28 Cross-sectional view along the GG axis;

[0046] Figure 30 for Figure 28 Cross-sectional view in the mid-HH direction;

[0047] Figure 31 A three-dimensional diagram of a lower liner ring in an embodiment of the present invention;

[0048] Figure 32 A three-dimensional diagram of a position limiting cover plate in an embodiment of the present invention;

[0049] Figure 33 2. It is a top view of the limiting cover plate in an embodiment of the present invention;

[0050] Figure 34 2 is a cross-sectional view of a position limiting cover plate in an embodiment of the present invention.

[0051] Reference numerals:

[0052] 1-upper hydraulic seal main spring assembly; 11-outer tube; 111-first flange portion; 112-barb structure; 113-reinforcement rib; 12-first rubber body; 121-rubber layer; 122-rubber block; 123-first rubber membrane structure; 124-first limiting protrusion; 125-second limiting protrusion; 126-first thickened portion; 127-first boss; 13-inner lining; 131-interference fitting section; 132-avoidance portion;

[0053] 2 - lower liquid resistance seal main spring assembly; 21 - inner tube; 211 - chamfer; 212 - mounting hole; 213 - slot; 214 - second boss; 22 - lower backing ring; 221 - first ring body; 222 - center hole; 223 - first limiting groove; 224 - third boss; 23 - second rubber body; 231 - second rubber membrane structure; 232 - second thickened portion;

[0054] 3-flow channel assembly; 31-flow channel body; 311-second ring body; 312-liquid flow channel groove; 313-first flow hole; 314-first limiting portion; 315-first limiting step; 32-flow channel upper cover; 321-third ring body; 322-fourth boss; 323-second flow hole; 324-second limiting step; 325-second limiting portion; 33-rubber limiting ring; 331-third limiting protrusion;

[0055] 4-upper liquid chamber;

[0056] 5-lower liquid chamber;

[0057] 6-limiting cover plate; 61-through hole; 62-claw; 63-second flange portion; 64-groove portion. DETAILED DESCRIPTION

[0058] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0059] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and 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 should not be understood as limiting the specific scope of protection of the present invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. Throughout the description of the present invention, "several" and "a number" mean two or more, unless otherwise specifically defined.

[0061] The following description of the embodiments of the present invention is provided in conjunction with the accompanying drawings to further describe the specific embodiments of the present invention so that the technical solutions and beneficial effects of the present invention will be more clearly understood. The following description of the embodiments with reference to the accompanying drawings is illustrative and intended to explain the present invention, but is not to be construed as limiting the present invention.

[0062] See also Figures 1 to 3 As shown, an embodiment of the present invention provides an axial subframe hydraulic bushing assembly, comprising an upper hydraulic seal main spring assembly 1 and a lower hydraulic resistance seal main spring assembly 2, and a flow channel assembly 3. The upper hydraulic seal main spring assembly 1 and the lower hydraulic resistance seal main spring assembly 2 are combined to form an inner cavity. The flow channel assembly 3 is disposed within the inner cavity and divides it into an upper liquid chamber 4 and a lower liquid chamber 5. A flow channel is provided within the flow channel assembly 3 for connecting the upper liquid chamber 4 and the lower liquid chamber 5. The upper liquid chamber 4, the lower liquid chamber 5, and the flow channel are filled with damping fluid. The size and shape of the upper and lower liquid chambers are primarily designed based on the mechanical and dynamic characteristics of the bushing.

[0063] See also Figures 4 to 7 As shown, the upper hydraulic seal main spring assembly 1 includes an outer tube 11, an inner liner 13, and a first rubber body 12. The inner liner 13 is cylindrical and disposed within the upper opening of the outer tube 11. The first rubber body 12 includes a rubber layer 121 vulcanized and disposed on the inner side of the outer tube 11, a rubber block 122 vulcanized and connected to the inner liner 13, and a first rubber membrane structure 123 for connecting the rubber layer 121 and the rubber block 122. A first stopper 124 is provided on the rubber layer 121 in the middle of the outer tube 11 to mate with the flow channel assembly 3. Specifically, the first stopper 124 is in an eight-shaped structure.

[0064] See also Figures 8 and 9 As shown, the upper end opening of the outer tube 11 is bent outward to form a first flange portion 111, a barb structure 112 is provided at the lower end opening of the outer tube 11, and reinforcing ribs 113 are provided on the outer side wall of the outer tube 11 along the circumferential direction; the first rubber body 12 is located at a position opposite to the first flange portion 111 and has two first bosses 127 provided thereon; a first thickened portion 126 is provided at a position opposite to the first boss 127 of the first rubber membrane structure 123.

[0065] See also Figure 10-11As shown, the middle part of the liner 13 is an interference fitting section 131 adapted to the lower liquid resistance seal main spring assembly 2, and the two ends of the liner 13 expand outward to form an avoidance portion 132; the rubber block 122 is vulcanized on the outside of the interference fitting section 131 and wraps the avoidance portion 132, and the part of the rubber block 122 located inside the avoidance portion 132 is provided with a second limiting protrusion 125 adapted to the lower liquid resistance seal main spring assembly 2.

[0066] The rubber structure of the upper hydraulic seal main spring assembly is designed as a thick arm + thin film to meet the different static stiffness requirements in the vehicle's fore-aft and lateral directions. The outer tube is fully coated with rubber to ensure a good seal with the lower hydraulic resistance seal main spring assembly during assembly. The center of the inner liner is designed with an interference fit with the inner tube to ensure the release force between the upper and lower hydraulic resistance seal main springs during assembly. The upper and lower sides of the inner liner are recessed outward, and rubber is vulcanized in the recessed areas. Rubber seals are also added on both sides to fully ensure an effective seal for the damping fluid. A "eight"-shaped groove is provided in the center of the outer tube to facilitate the assembly and sealing of the rubber stopper. A barbed structure is designed at the lower end of the outer tube to ensure separation from the lower hydraulic resistance seal main spring after the bushing assembly is assembled and to enhance the liquid seal. Furthermore, according to customer needs, the bushing's inner liner can be enhanced with concave or beveled surfaces in appropriate areas, the rubber body can be thickened in areas other than the appropriate liquid chamber membrane, and raised or beveled surfaces can be designed on the inner wall of the outer tube to provide three-dimensional static stiffness.

[0067] See also Figures 21 to 24 As shown, the lower liquid resistance seal main spring assembly 2 includes an inner tube 21 and a lower liner ring 22. The lower liner ring 22 is arranged outside the lower end opening of the inner tube 21, and a second rubber body 23 is vulcanized between the lower liner ring 22 and the inner tube 21; second bosses 214 are arranged on both sides of the lower end of the inner tube 21, and the outer side of the second boss 214 is an inclined surface; see Figures 28 to 31 As shown, the lower liner ring 22 includes a first ring body 221, and the inner wall of the center hole 222 of the first ring body 221 is a slope adapted to the second boss 214; the side of the first ring body 221 is provided with a first limiting groove 223 for preventing the upper hydraulic sealing main spring assembly 1 from falling out; and third bosses 224 are relatively provided on both sides of the top surface of the first ring body 221.

[0068] See also Figures 25 to 27 As shown, the upper end opening of the inner tube 21 is a mounting hole 212, and a card groove 213 is relatively arranged in the mounting hole 212; a chamfer 211 is provided at the lower end edge of the inner tube 21; the part of the second rubber body 23 located between the lower liner ring 22 and the second boss 214 is a second rubber membrane structure 231, and the part of the second rubber body 23 located between the lower liner ring 22 and the inner tube 21 is a second thickened portion 232.

[0069] The inner hole of the inner tube is designed as an installation hole according to the loading requirements, and a groove is designed inside to facilitate the positioning of the bushing in the direction of time and the assembly of the limit cover plate; the outer wall size of the upper part of the inner tube is designed in combination with the liner in the upper hydraulic seal main spring assembly to ensure the interference with the liner and the ejection force after assembly; the lower end of the inner tube is designed with grooves, bosses and inclined surfaces in different directions, mainly to ensure the three-dimensional static stiffness of the bushing; the upper side of the lower end boss is designed with a limiting plane, and the limiting plane mainly ensures the sliding of the flow channel assembly on the inner end face of the bushing; the lower bushing ring is designed with grooves, inclined surfaces and bosses to ensure the three-dimensional static stiffness of the bushing and increase the volume of the lower liquid chamber; the lower end of the lower bushing is designed with a groove structure, this groove structure is to ensure the anti-escape of the upper and lower liquid resistance seal main spring assemblies during direct assembly and to accommodate the interference and overflow of the sealing rubber. The vulcanized rubber body between the inner tube and the lower liner ring is designed with a film structure. In order to meet the shape of the lower liquid chamber of the liquid resistance bushing and the volume stiffness of the liquid chamber, it can be designed into different shapes according to the structure of the product.

[0070] See also Figures 32 to 34 As shown, the axial subframe hydraulic bushing assembly also includes a stopper cover plate 6, with a through hole 61 in the middle that mates with the mounting hole 212. A claw 62 is positioned within the through hole 61, mates with the retaining groove 213. Recesses 64 are positioned on opposite sides of the stopper cover plate 6, and a second flange 63 is positioned along the edge of the stopper cover plate 6. The stopper cover plate is stamped from steel sheet (material: DC03 or Q235), with flanges and recesses added around the perimeter to provide environmentally friendly protection while increasing the strength required for the vehicle. A through hole and a claw are designed in the middle of the stopper cover plate, which is assembled between the cover plate and the inner tube of the bushing. The inner hole ensures the proper mounting of the bushing body.

[0071] See also Figures 12 to 16 As shown, the flow channel assembly 3 includes a flow channel body 31, a flow channel upper cover plate 32 and a rubber limit ring 33; the flow channel body 31 includes a second ring body 311, the top surface of the second ring body 311 is provided with a liquid flow channel groove 312, and the bottom surface of the second ring body 311 is provided with a first flow hole 313 for connecting the liquid flow channel groove 312 and the lower liquid chamber 5; the flow channel upper cover plate 32 includes a third ring body 321, the third ring body 321 is buckled on the top surface of the second ring body 311, and the bottom surface of the third ring body 321 is provided with a fourth boss 322 adapted to the liquid flow channel groove 312, and the fourth boss 322 is provided with a second flow hole 323 for connecting the liquid flow channel groove 312 and the upper liquid chamber 4; the rubber limit ring 33 is sleeved on the outside of the connection between the second ring body 311 and the third ring body 321.

[0072] See also Figures 17 to 20As shown, the bottom surface of the second ring body 311 is located at the edge of the inner hole and is provided with a first limiting portion 314 for supporting the lower liquid resistance sealing main spring assembly 2, and the outer side surface of the second ring body 311 is provided with a first limiting step 315 adapted to the rubber limiting ring 33; the top surface of the third ring body 321 is located at the edge of the inner hole and is provided with a second limiting portion 325 for supporting the upper hydraulic sealing main spring assembly, and the outer side surface of the third ring body 321 is provided with a second limiting step 324 adapted to the rubber limiting ring 33; the outer circular surface of the rubber limiting ring 33 is provided with a third limiting protrusion 331 adapted to the first limiting protrusion 124.

[0073] The upper cover plate of the flow channel is designed with a concave and convex structure that is assembled with the flow channel body to ensure the positioning and assembly between the flow channel body; the inner side of the flow channel body is designed with liquid flow channels, and the number, length and cross-sectional area of ​​the channels are independently designed according to the dynamic characteristics requirements of the product; the flow channel body and the upper cover plate are injection molded separately, and later an independent flow channel cavity is formed by snap-fitting and welding, and enclosed to form a clamping structure of the sealing ring; the inner diameter surface of the flow channel and the inner tube of the lower liquid resistance sealing main spring are interference fit to form a seal, and the rubber limit ring and the upper hydraulic sealing main spring are interference fit according to the groove to ensure that the product has a certain radial movement space while achieving the sealing of the upper and lower liquid chambers during axial movement.

[0074] Assembly process of the present invention:

[0075] First, assemble the flow channel assembly and the lower hydraulic resistance seal main spring assembly together; at this time, the flow channel and the inner wall of the inner tube are interference-fitted, and the position is limited by the limit end face of the lower inner tube; then assemble the upper hydraulic seal main spring and the assembly together; at this time, the rubber limit block on the flow channel assembly is stuck in the "eight" structure of the inner wall of the outer tube, which plays a role in limiting and sealing; the middle part of the liner of the upper hydraulic seal main spring is interference-fitted with the inner tube, ensuring the fit between the two; the rubber seals on the upper and lower sides of the liner and the outer wall of the inner tube further enhance the sealing effect of the bushing. The lower end face of the liner fits with the upper end face of the flow channel, limiting the upper end face of the flow channel assembly to prevent the flow channel assembly from moving in the inner cavity of the bushing. After assembly, the barb structure at the lower end of the outer tube just falls into the groove at the lower end of the lower liner ring, which plays a role in preventing it from falling out. After assembly, the bushing is reduced in diameter, and after reduction, a perfect seal is achieved between the various components of the bushing; the reduction amount of the bushing is designed at a ratio of 5% to 10% based on the installation size of the bushing and the wall thickness of the rubber.

[0076] The working principle of the present invention is:

[0077] The upper hydraulic seal main spring assembly and the lower hydraulic resistance seal main spring assembly together form an inner cavity, which is then divided into an upper and lower liquid chambers by the flow channel assembly and rubber sealing ring. The upper and lower liquid chambers, as well as the flow channel cavity, are filled with a special damping fluid. Through holes are provided at both ends of the flow channel to connect to the upper and lower liquid chambers. When the hydraulic resistance bushing is subjected to external axial excitation, the rubber main spring displaces, causing the pressure difference between the two liquid chambers to fluctuate, and the liquid flows back and forth between the two liquid chambers through the flow channel. The vibrating liquid column (inertial mass) in the flow channel interacts with the expansion stiffness of the liquid chamber, forming a sub-vibration system within the rubber main spring vibration system. Through resonance, it achieves high damping dynamic characteristics in the resonant frequency range. The highlight of this invention is the structural design concept of decomposing and designing each component and then reassembling it to form the liquid chamber and seal assembly. This achieves an appearance similar to that of traditional radial hydraulic products, but is actually the industrialization of axial hydraulic bushings.

[0078] In the description of the specification, reference to the terms "one embodiment," "preferably," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. The schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0079] The present invention is not limited to the above-described embodiments. Persons skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are deemed to be within the scope of protection of the present invention. Any matters not described in detail in this specification constitute prior art known to those skilled in the art.

Claims

1. An axial subframe hydraulic bushing assembly, comprising an upper hydraulic seal main spring assembly (1) and a lower hydraulic resistance seal main spring assembly (2), characterized in that: It also includes a flow channel assembly (3); the upper hydraulic sealing main spring assembly (1) and the lower liquid resistance sealing main spring assembly (2) are combined to form an inner cavity; the flow channel assembly (3) is arranged in the inner cavity and divides it into an upper liquid chamber (4) and a lower liquid chamber (5), and a flow channel for connecting the upper liquid chamber (4) and the lower liquid chamber (5) is provided in the flow channel assembly (3); the upper liquid chamber (4), the lower liquid chamber (5) and the flow channel are filled with damping liquid; The upper hydraulic seal main spring assembly (1) comprises an outer tube (11), an inner liner (13) and a first rubber body (12); the inner liner (13) is a cylindrical structure and is arranged in the upper end opening of the outer tube (11); the first rubber body (12) comprises a rubber layer (121) vulcanized and arranged on the inner side of the outer tube (11), a rubber block (122) vulcanized and connected to the inner liner (13), and a first rubber membrane structure (123) for connecting the rubber layer (121) and the rubber block (122); the rubber layer (121) is provided with a first limiting protrusion (124) adapted to the flow channel assembly (3) at a position in the middle of the outer tube (11); The flow channel assembly (3) comprises a flow channel body (31), a flow channel upper cover plate (32) and a rubber limiting ring (33); the flow channel body (31) comprises a second ring body (311), the top surface of the second ring body (311) is provided with a liquid flow channel groove (312), and the bottom surface of the second ring body (311) is provided with a first liquid flow hole (313) for connecting the liquid flow channel groove (312) and the lower liquid chamber (5); the flow channel upper cover plate (32) comprises a third ring body (3 21), the third ring body (321) is buckled on the top surface of the second ring body (311), and the bottom surface of the third ring body (321) is provided with a fourth boss (322) adapted to the liquid flow channel groove (312), and the fourth boss (322) is provided with a second liquid flow hole (323) for connecting the liquid flow channel groove (312) and the upper liquid chamber (4); the rubber limiting ring (33) is sleeved on the outside of the connection between the second ring body (311) and the third ring body (321); The outer circumferential surface of the rubber limiting ring (33) is provided with a third limiting protrusion (331) adapted to the first limiting protrusion (124); The first limiting protrusion (124) is in an eight-shaped structure.

2. The axial subframe hydraulic bushing assembly according to claim 1, characterized in that: The upper end opening of the outer tube (11) is bent outward to form a first flange portion (111); a barb structure (112) is provided at the lower end opening of the outer tube (11); and reinforcing ribs (113) are provided on the outer side wall of the outer tube (11) along the circumferential direction; the first rubber body (12) is provided with two first bosses (127) at a position opposite to the first flange portion (111); and a first thickened portion (126) is provided at a position opposite to the first boss (127) of the first rubber membrane structure (123).

3. The axial subframe hydraulic bushing assembly according to claim 1, characterized in that: The middle portion of the inner liner (13) is an interference fitting section (131) adapted to the lower liquid resistance seal main spring assembly (2), and both ends of the inner liner (13) are expanded outward to form an avoidance portion (132); the rubber block (122) is vulcanized on the outside of the interference fitting section (131) and wraps the avoidance portion (132), and the portion of the rubber block (122) located inside the avoidance portion (132) is provided with a second limiting protrusion (125) adapted to the lower liquid resistance seal main spring assembly (2).

4. The axial subframe hydraulic bushing assembly according to claim 1, characterized in that: The lower hydraulic resistance seal main spring assembly (2) comprises an inner tube (21) and a lower liner ring (22), wherein the lower liner ring (22) is arranged outside the lower end opening of the inner tube (21), and a second rubber body (23) is vulcanized between the lower liner ring (22) and the inner tube (21); second bosses (214) are arranged oppositely on both sides of the lower end of the inner tube (21), and the outer side of the second boss (214) is an inclined surface; the lower liner ring (22) comprises a first ring body (221), and the inner wall of the center hole (222) of the first ring body (221) is an inclined surface adapted to the second boss (214); a first limiting groove (223) for preventing the upper hydraulic resistance seal main spring assembly (1) from falling out is arranged on the side surface of the first ring body (221); and third bosses (224) are arranged oppositely on both sides of the top surface of the first ring body (221).

5. The axial subframe hydraulic bushing assembly according to claim 4, characterized in that: The upper end opening of the inner tube (21) is a mounting hole (212), and a clamping groove (213) is arranged in the mounting hole (212); a chamfer (211) is arranged at the lower end edge of the inner tube (21); the portion of the second rubber body (23) located between the lower liner ring (22) and the second boss (214) is a second rubber membrane structure (231), and the portion of the second rubber body (23) located between the lower liner ring (22) and the inner tube (21) is a second thickened portion (232).

6. The axial subframe hydraulic bushing assembly according to claim 5, characterized in that: The device further comprises a limiting cover plate (6), wherein a through hole (61) adapted to the mounting hole (212) is provided in the middle of the limiting cover plate (6), and a clamping claw (62) adapted to the clamping groove (213) is provided in the through hole (61); groove portions (64) are provided in opposite directions on both sides of the limiting cover plate (6); and a second flange portion (63) is provided on the edge of the limiting cover plate (6).

7. The axial subframe hydraulic bushing assembly according to claim 1, characterized in that: The bottom surface of the second ring body (311) is located at the edge of the inner hole and is provided with a first limiting portion (314) for resisting the lower hydraulic resistance sealing main spring assembly (2), and the outer side surface of the second ring body (311) is provided with a first limiting step (315) adapted to the rubber limiting ring (33); the top surface of the third ring body (321) is located at the edge of the inner hole and is provided with a second limiting portion (325) for resisting the upper hydraulic resistance sealing main spring assembly, and the outer side surface of the third ring body (321) is provided with a second limiting step (324) adapted to the rubber limiting ring (33).

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