Hydraulic bushing and vehicle

Abstract

The application provides a hydraulic bushing and a vehicle, and the hydraulic bushing comprises an outer tube, an inner tube and an elastic body connected between the outer tube and the inner tube, a cavity is formed between the elastic body and the outer tube, and a limiting structure abutting against the outer tube is arranged in the cavity; the limiting structure has two limiting blocks extending to the two sides of the elastic body, respectively, two liquid chambers are formed between the two limiting blocks and the elastic body, respectively, and a flow channel communicating the two liquid chambers is arranged on the limiting structure. The elastic body has a blocking structure arranged between the two liquid chambers, and the blocking structure has blocking blocks arranged corresponding to the two liquid chambers; when the pressure of damping liquid in one of the liquid chambers is greater than a preset threshold value, the corresponding blocking block can be deformed by extrusion, so that the damping liquid passes through the blocking block and flows to the other liquid chamber. The hydraulic bushing changes the fixed characteristics of the traditional bushing damping, and through the arrangement of the limiting structure and the blocking structure, the vehicle handling and comfort performance can be improved.

Description

Hydraulic bushings and vehicles Technical Field

[0001] This invention relates to the field of vehicle parts technology, and in particular to a hydraulic bushing. The invention also relates to a vehicle having the hydraulic bushing. Background Technology

[0002] Vehicle suspension bushings are typically assembled on chassis components such as control arms, linkages, steering knuckles, and subframes of the vehicle suspension. As connecting units of vehicle chassis structural components, vehicle suspension bushings enable relative movement between structural components and provide vibration isolation and absorption.

[0003] With the increasing specialization of vehicle powertrains—from gasoline and hybrid to electric—the requirements for overall vehicle comfort and NVH (noise, vibration, and harshness) are becoming more stringent. The front suspension, being closer to the driver's cabin, directly determines the vehicle's driving comfort and handling due to the characteristics of its bushings. Therefore, specific requirements are placed on the Z-direction dynamic stiffness and X-direction damping of these bushings. However, traditional bushings typically consist of an inner tube, an outer tube, and a rubber bushing. This relatively simple structure can only provide fixed damping characteristics and cannot meet the overall vehicle requirements. Especially on bumpy roads, impacts can easily cause collision noises, resulting in a poor driving experience.

[0004] In addition, the traditional bushing structure has low X-direction damping and insufficient vibration absorption capacity, resulting in greater vibration transmitted to the vehicle body, causing severe vibration in the cabin and a poor overall driving experience. Furthermore, its high Z-direction dynamic stiffness leads to poor vehicle comfort when traversing uneven road surfaces at high speeds. Moreover, its low ratio of axial stiffness to radial stiffness makes it difficult to match the overall vehicle handling performance, thus reducing the tuning space. Summary of the Invention

[0005] In view of this, the present invention aims to provide a hydraulic bushing to improve the driving comfort and handling of the vehicle.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A hydraulic bushing includes an outer tube, an inner tube, and an elastic body connected between the outer tube and the inner tube. A cavity is formed between the elastic body and the outer tube, and a limiting structure that abuts against the outer tube is provided in the cavity.

[0008] The limiting structure has two limiting blocks extending to both sides of the elastic body, and the two limiting blocks and the elastic body respectively enclose two liquid chambers. The limiting structure is provided with a flow channel connecting the two liquid chambers.

[0009] The elastomer has a blocking structure positioned between the two liquid chambers, and the blocking structure has blocking blocks respectively provided for the two liquid chambers.

[0010] When the pressure of the damping fluid in one of the liquid chambers is greater than a preset threshold, it can compress the corresponding blocking block to deform, so that the damping fluid passes over the blocking block and flows to the other liquid chamber.

[0011] Furthermore, the blocking block is provided with a guide slope that is inclined toward the corresponding liquid chamber.

[0012] Furthermore, the interior of the blocking block is formed with a cavity having an opening toward another of the liquid chambers.

[0013] Furthermore, the inner tube includes a first protrusion that bulges outward in a radial direction and a second protrusion located on the opposite side of the first protrusion;

[0014] The second protrusion has a channel communicating with one of the liquid chambers, and a steel ball is sealed in the channel.

[0015] Furthermore, the inner tube is die-cast; and / or,

[0016] Relative to the end of the channel that communicates with the liquid chamber, the other end of the channel is configured as a conical hole, and the steel ball is press-fitted into the conical hole.

[0017] Furthermore, corresponding to the limiting block, the elastic body is provided with a plurality of protrusions arranged at intervals; and / or,

[0018] The limiting block has a weight-reducing part on the side that abuts against the outer tube. The weight-reducing part includes multiple weight-reducing grooves, which are connected by an airflow channel. The limiting block also has an air outlet that connects the weight-reducing part and the liquid chamber.

[0019] Furthermore, the elastic body is embedded with a die-cast skeleton, the skeleton including two end portions located at both ends of the limiting structure, and a connecting portion connecting the two end portions.

[0020] Furthermore, at least one end of the skeleton is provided with a positioning hole, which penetrates the elastomer.

[0021] Furthermore, at least one end of the outer tube is provided with a retaining edge that blocks the outside of the frame.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) The hydraulic bushing of the present invention, by setting two limiting blocks, allows the damping fluid of the two liquid chambers to flow between the two liquid chambers through the flow channel. During low-frequency, large-amplitude vibration, the damping fluid has a large damping capacity and can fully absorb energy, thereby preventing vibration from being transmitted to the cockpit. In addition, by setting a blocking structure, during high-frequency, small-amplitude vibration, the pressure of the damping fluid is greater than a preset threshold. The damping fluid of the liquid chamber with higher pressure passes through the blocking block and enters the other liquid chamber, thereby reducing the damping pressure and decreasing the dynamic stiffness of the hydraulic bushing. This hydraulic bushing, by using an elastomer as a buffer area and combining the aforementioned limiting blocks and blocking structure, can improve the overall driving comfort and handling of the vehicle.

[0024] (2) By setting a guide slope that is inclined towards the corresponding liquid chamber between the two liquid chambers, a guide is formed for the flow of damping liquid into the other liquid chamber, which facilitates the flow of damping liquid.

[0025] (3) By setting a cavity inside the blocking block, the blocking block is easily deformed when the damping liquid in the high-pressure liquid chamber squeezes the blocking block, thereby providing space for the flow of the damping liquid and further facilitating the flow of the damping liquid.

[0026] (4) By setting a protrusion in the radial direction of the inner tube, it is easy to connect and position the inner tube with the external elastic body. In addition, by setting steel balls to block the damping fluid channel on the inner tube, the stability and reliability of the hydraulic bushing sealing system are enhanced, enabling the product to be filled dry, compatible with existing production lines, reducing equipment investment and increasing the cost advantage of the product.

[0027] (5) By die-casting the inner tube, the machining process is reduced, the dimensional stability is guaranteed and the cost is reduced; and / or, the steel ball and the tapered hole structure are matched, and the sealing is guaranteed by gradually increasing the interference fit, so as to ensure that the damping fluid has no external leakage.

[0028] (6) By setting multiple protrusions at intervals at the positions of the corresponding limiting blocks of the elastic body, the contact area during collision is reduced, thereby eliminating collision noise.

[0029] (7) By setting a die-cast skeleton in the elastic body, and the skeleton having a connecting part connecting the two end parts, the radial stiffness of the hydraulic bushing is greatly improved, which is beneficial to the control and adjustment of the vehicle chassis.

[0030] (8) By providing a positioning hole at at least one end of the skeleton, and the positioning hole penetrating the elastomer, it is beneficial to determine the position of the skeleton during assembly, so as to avoid the above-mentioned connection part blocking the damping hole and eliminate the fluctuation of the elastomer relative to the skeleton, thereby increasing stability.

[0031] (9) By setting a flange at at least one end of the outer tube, the skeleton embedded in the elastic body is subjected to interference restriction, which can prevent the internal elastic body from coming out, thereby ensuring that the damping fluid does not leak, ensuring that the hydraulic bushing is stable during use, and extending its service life.

[0032] Another object of the present invention is to provide a vehicle having a hydraulic bushing as described above.

[0033] By incorporating the hydraulic bushings described above, the vehicle of the present invention can improve its handling and comfort, thereby ensuring its operational stability and lifespan. Attached Figure Description

[0034] The accompanying drawings, which constitute a part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0035] Figure 1 is a schematic diagram of the structure of the hydraulic bushing according to an embodiment of the present invention;

[0036] Figure 2 is a top view of the hydraulic bushing according to an embodiment of the present invention;

[0037] Figure 3 is a cross-sectional view of part AA in Figure 2;

[0038] Figure 4 is a cross-sectional view of part BB in Figure 2;

[0039] Figure 5 is a cross-sectional view of the CC region in Figure 3;

[0040] Figure 6 is a first-view structural schematic diagram of the hydraulic bushing excluding the outer tube according to an embodiment of the present invention;

[0041] Figure 7 is a structural schematic diagram of the first limiting block and the second limiting block from a first perspective according to an embodiment of the present invention;

[0042] Figure 8 is a structural schematic diagram of the first limiting block and the second limiting block from a second perspective according to an embodiment of the present invention;

[0043] Figure 9 is a first-view structural schematic diagram of the elastomer described in an embodiment of the present invention;

[0044] Figure 10 is a structural schematic diagram of the elastomer described in an embodiment of the present invention from a second perspective.

[0045] Figure 11 is a schematic diagram of the hydraulic bushing excluding the outer tube according to an embodiment of the present invention from a second perspective.

[0046] Figure 12 is a magnified view of a portion of Figure 11;

[0047] Figure 13 is a structural schematic diagram of the inner tube from a first perspective according to an embodiment of the present invention;

[0048] Figure 14 is a structural schematic diagram of the inner tube from a second perspective according to an embodiment of the present invention;

[0049] Figure 15 is a schematic diagram of the skeleton structure according to an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Outer tube; 2. Inner tube; 3. Elastomer; 4. Limiting structure; 5. Skeleton; 6. First liquid chamber; 7. Second liquid chamber; 8. First opening; 9. Second opening; 10. Third opening; 11. Fourth opening; 12. Steel ball;

[0052] 101. Edge guard;

[0053] 201a, First protrusion; 201b, Second protrusion; 202, Channel; 203, Positioning platform;

[0054] 301. Through hole; 302. First recess; 303. Second recess; 304. Separating position; 305. Block; 306. Buffer zone; 307. Protrusion;

[0055] 401. First limiting block; 402. Second limiting block; 403. Spacing end; 404. Connecting end;

[0056] 501. Ring; 502. Rib plate; 503. Positioning hole;

[0057] 2021, conical hole;

[0058] 3051, Guide slope; 3052, Cavity;

[0059] 4011, First flow channel; 4012, Second flow channel; 4013, Air outlet; 4014, Airflow channel; 4015, Weight reduction groove. Detailed Implementation

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0061] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection between two internal blocks of a component. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0063] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0064] This embodiment relates to a hydraulic bushing, which includes an outer tube 1, an inner tube 2, and an elastic body 3 connected between the outer tube 1 and the inner tube 2. A cavity is formed between the elastic body 3 and the outer tube 1. A limiting structure 4 is provided in the cavity to abut against the outer tube 1. The limiting structure 4 has two limiting blocks that extend to both sides of the elastic body 3. Two liquid chambers are formed between the two limiting blocks and the elastic body 3. A flow channel connecting the two liquid chambers is provided on the limiting structure 4.

[0065] In addition, the elastomer 3 has a blocking structure placed between two liquid chambers, and the blocking structure has blocking blocks 305 respectively provided for the two liquid chambers; when the pressure of the damping liquid in one liquid chamber is greater than a preset threshold, it can squeeze the corresponding blocking block 305 to deform, so that the damping liquid passes over the blocking block 305 and flows to the other liquid chamber.

[0066] In this embodiment, the hydraulic bushing, through a cavity formed between the elastic body 3 and the outer tube 1, and two limiting blocks forming two liquid chambers between the elastic body 3 and the limiting blocks, contains damping fluid. The damping fluid in both chambers is connected by a flow channel, allowing for fluid circulation. This ensures that during low-frequency, high-amplitude vibrations, the damping fluid provides significant damping, effectively absorbing energy and preventing vibration transmission to the cockpit. Furthermore, a blocking structure between the two chambers allows the damping fluid pressure to exceed a preset threshold during high-frequency, low-amplitude vibrations. The damping fluid in the chamber with higher pressure then flows past the blocking block 305 into the other chamber, reducing the damping fluid pressure and decreasing the dynamic stiffness of the hydraulic bushing. This design improves the vehicle's driving comfort and handling.

[0067] It should be noted that the hydraulic bushing provided in this embodiment is mainly used in the front suspension of a vehicle. Of course, it can also be mounted on chassis components such as control arms, linkages, steering knuckles, and subframes of the vehicle suspension. As a connecting unit for vehicle chassis structural components, this hydraulic bushing enables relative movement between structural components and provides vibration isolation and absorption.

[0068] In this embodiment, since the installation direction of the hydraulic bushing is inconsistent with the vehicle direction, the installation direction of the hydraulic bushing on the vehicle body will be described for ease of understanding. The X, Y, and Z directions of the hydraulic bushing are shown in Figures 2 and 3, where the X direction of the hydraulic bushing corresponds to the Y direction of the vehicle body, the Y direction of the hydraulic bushing corresponds to the Z direction of the vehicle body, and the Z direction of the hydraulic bushing corresponds to the X direction of the vehicle body.

[0069] Based on the above design concept, as an exemplary structure of the hydraulic bushing in this embodiment, as shown in Figure 1, the inner tube 2, the elastic body 3 and the outer tube 1 of the hydraulic bushing in this embodiment are connected sequentially from the inside to the outside.

[0070] As shown in Figures 2 to 5, in this embodiment, the inner tube 2 and the elastomer 3 are connected by vulcanization. The elastomer 3 in this embodiment is made of rubber, the inner tube 2 is made of cast aluminum, and the limiting block is made of nylon, thereby achieving overall lightweighting of the hydraulic bushing, reducing carbon emissions, realizing a large proportion of material recycling, and meeting environmental protection design requirements.

[0071] As shown in Figures 3 to 5, the elastic body 3 in this embodiment is constructed as a rotating body, with a receiving cavity for accommodating the inner tube 2 provided at the center of the elastic body 3. Furthermore, the elastic body 3 also has an inwardly recessed first recess 302 and a second recess 303. Specifically, as shown in Figures 9 and 10, the first recess 302 and the second recess 303 are formed on the outer circumference of the elastic body 3 and are disposed opposite to each other.

[0072] Referring again to Figures 3 and 5, the first recess 302 and the second recess 303 respectively form the two liquid chambers mentioned above between the two limiting blocks. Furthermore, referring to Figures 9 and 10, the first recess 302 and the second recess 303 are both constructed as a V-shaped structure that gradually expands towards the outer periphery of the elastic body 3, with rounded corners designed at the sharp corners of the V-shaped structure.

[0073] This design reduces the structural stiffness of the elastomer 3, decreasing its volumetric stiffness during high-frequency dynamic conditions on bumpy road sections. When the damping fluid is subjected to external forces, the elastomer 3, with its first recess 302 and second recess 303, is prone to deformation, thus reducing the flow of damping fluid within the same time frame and consequently lowering dynamic stiffness, which is beneficial for comfort tuning. Furthermore, this design allows the rubber elastomer 3 to have a deformation allowance during vehicle movement, thereby reducing strain and extending the service life of the elastomer 3.

[0074] As described above, as shown in Figures 6 and 7, in this embodiment, two limiting blocks cover the outside of the elastic body 3, and flow channels for the damping fluid to flow into the two limiting blocks are provided on the outer periphery of the two limiting blocks. The damping fluid can flow between the two liquid chambers through these flow channels, so that when the liquid chamber of the hydraulic bushing is compressed, the damping fluid in the compressed liquid chamber flows through the flow channels to the other liquid chamber.

[0075] When the vehicle vibrates at low frequency and large amplitude, the damping fluid in the two chambers mentioned above flows through this channel. Due to the low frequency of the vehicle's vibration, the damping fluid experiences low pressure. As the damping fluid passes through the channel, it rubs against the channel, exhibiting strong damping characteristics. This allows it to effectively absorb energy and prevent vibration from being transmitted to the cockpit.

[0076] As a specific implementation of this embodiment, as shown in Figures 6 to 8, the two limiting blocks in this embodiment are constructed as arc-shaped blocks fastened to the elastic body 3. One end of the two limiting blocks is connected to form a contact end 404, and the other end is spaced to form a gap end 403. The arc-shaped outer perimeter formed by the two limiting blocks is equal to the maximum outer diameter of the elastic body 3, so that when the outer tube 1 is pressed against the outer perimeter of the elastic body 3 and the limiting blocks, the contact area between the outer tube 1 and the elastic body 3 and the limiting blocks forms a pressure seal, and the damping fluid is restricted from flowing through the channels formed on the two limiting blocks.

[0077] For ease of description, the two limiting blocks are designated as the first limiting block 401 and the second limiting block 402, the two liquid chambers are designated as the first liquid chamber 6 and the second liquid chamber 7, and the flow channels are designated as the first flow channel 4011 and the second flow channel 4012. As shown in Figures 7 and 8, in this embodiment, the first limiting block 401 and the first recess 302 have a first opening 8 for the damping fluid to flow out, and the damping fluid in the first liquid chamber 6 flows into the first flow channel 4011 from the first opening 8.

[0078] As shown in Figures 7 and 8, in this embodiment, the first flow channel 4011 meanders from the junction end 404 of the two limiting blocks to the spacer end 403 and then back to the junction end 404, forming a U-shaped bend. Similarly, there is a second opening 9 between the second limiting block 402 and the second recess 303 for the damping fluid to flow out, and the damping fluid in the second liquid chamber 7 flows into the second flow channel 4012 from the second opening 9.

[0079] As shown in Figures 7 and 8, in this embodiment, the second flow channel 4012 is also formed as a U-shaped bend that meanders from the junction end 404 of the two limiting blocks to the spacer end 403 and then back to the junction end 404. The first flow channel 4011 and the second flow channel 4012 are connected at the junction end 404, allowing the damping fluid to circulate between the first liquid chamber 6 and the second liquid chamber 7 during flow. This arrangement increases the friction time of the damping fluid in the first flow channel 4011 and the second flow channel 4012, thereby achieving the aforementioned large damping characteristics and better preventing vibration from being transmitted to the cockpit.

[0080] As shown in Figures 9 and 10, a groove is provided on the elastic body 3 to accommodate the aforementioned connecting end 404, so that the aforementioned outer tube 1 is pressed against the outer periphery of the elastic body 3 and the limiting block to form a pressure seal. In addition, as shown in Figures 9 and 11, a blocking structure is provided on the elastic body 3, and this blocking structure is formed at the aforementioned spacer end 403.

[0081] In terms of specific structure, as shown in Figure 11, the blocking structure of this embodiment includes two blocking blocks 305 arranged opposite to each other. A third opening 10 for the damping fluid in the first liquid chamber 6 to flow out is formed on the first limiting block 401, and a fourth opening 11 for the damping fluid in the second liquid chamber 7 to flow out is formed on the second limiting block 402. The two blocking blocks 305 are respectively located in the first liquid chamber 6 and the second liquid chamber 7 near the third opening 10 and the fourth opening 11.

[0082] Referring to Figures 5 and 12, in one specific embodiment, the two blocking blocks 305 are positioned opposite each other at the separation position 304 between the first liquid chamber 6 and the second liquid chamber 7, and the two blocking blocks 305 can abut against the outer pipe 1. When the vehicle is undergoing high-frequency, low-amplitude vibration, the flow of damping fluid in the two liquid chambers conflicts with each other. Due to the high frequency, the damping fluid experiences high pressure. When the pressure on the damping fluid in one of the liquid chambers exceeds the deformation force of the blocking block 305 itself, the blocking block 305 deforms, connecting the first liquid chamber 6 and the second liquid chamber 7. This reduces the pressure in the liquid chamber, decreases the dynamic stiffness of the hydraulic bushing, and thus improves the vehicle's NVH performance.

[0083] Furthermore, as a preferred embodiment, the blocking block 305 of this embodiment is provided with a guide slope 3051 that is inclined toward the corresponding liquid chamber. Specifically, as shown in FIG12, taking the blocking block 305 in the first liquid chamber 6 as an example, the guide slope 3051 of the blocking block 305 extends from the third opening 10 toward the separation position 304 between the first liquid chamber 6 and the second liquid chamber 7. The guide slope 3051 can guide the damping liquid in the first liquid chamber 6, so that the damping liquid is easily squeezed at the separation position 304, thereby connecting the first liquid chamber 6 and the second liquid chamber 7.

[0084] Furthermore, to further facilitate the deformation of the blocking block 305, in a preferred embodiment of this invention, a cavity 3052 is formed inside the blocking block 305, and the cavity 3052 has an opening facing another liquid chamber. Specifically, as shown in FIG12, the cavity 3052 of the blocking block 305 in this embodiment is formed according to the shape of the blocking block 305, thereby forming a shell shape for the blocking block 305 to deform under pressure.

[0085] It should be noted that when the vehicle is in a low-frequency, large-amplitude vibration, the blocking structure of this embodiment will not be squeezed and deformed because the frequency is low and the pressure on the damping fluid is low. At this time, the first liquid chamber 6 and the second liquid chamber 7 can only flow through the above-mentioned flow channel.

[0086] When the vehicle is subjected to high-frequency, low-amplitude vibration, the aforementioned blocking block 305 can deform due to the pressure exerted on the damping fluid. At this time, since the first flow channel 4011 and the second flow channel 4012 have bends, and the third and fourth outlets are close to the separation position 304 between the first liquid chamber 6 and the second liquid chamber 7, most of the damping fluid in the two liquid chambers will flow out from the blocking structure, thereby reducing the damping fluid pressure more quickly and decreasing the dynamic stiffness of the hydraulic bushing.

[0087] Furthermore, the inner tube 2 in this embodiment includes a radially outwardly protruding first protrusion 201a and a second protrusion 201b located on the opposite side of the first protrusion 201a. The second protrusion 201b is provided with a channel 202 communicating with one of its liquid chambers, and a steel ball 12 is sealed in the channel 202. As shown in Figures 3, 13, and 14, based on the overall vehicle design as a buffer area, the first protrusion 201a and the second protrusion 201b are set as hard limits to meet the overall vehicle driving experience.

[0088] In terms of specific structure, as shown in Figures 3 and 13, to facilitate the filling of damping fluid into the liquid chamber, in this embodiment, a channel 202 communicating with the second liquid chamber 7 is provided on the second protrusion 201b, and the elastic body 3 has a through hole 301 communicating with the channel 202. To prevent misalignment between the channel 202 and the through hole 301, a recessed positioning platform 203 is provided on the second protrusion 201 in this embodiment. The channel 202 is positioned on the positioning platform 203. Through the positioning of the positioning platform 203, the channel 202 and the through hole 301 on the elastic body 3 can remain in the same position, ensuring the usability of the hydraulic bushing.

[0089] In a preferred embodiment, the inner tube 2 is die-cast and integrally formed with the protrusions 201 on both sides of the inner tube 2. This configuration reduces machining processes, ensures the dimensional stability of the inner tube 2, and lowers production costs.

[0090] Furthermore, relative to the end of channel 202 that communicates with the liquid chamber, the other end of channel 202 is configured as a tapered bore 2021, and the steel ball 12 is press-fitted into the tapered bore 2021. Specifically, as shown in Figures 3 and 4, in order to ensure the sealing of the hydraulic system within the hydraulic bushing, this embodiment uses a steel ball 12 located at the inlet of channel 202 on the inner tube 2. The channel 202 at the inlet is constructed as a tapered bore 2021 that gradually narrows inward from the end face of the inner tube 2. The sealing performance is ensured by gradually increasing the interference fit between the steel ball 12 and the tapered bore 2021, thereby increasing the sealing stability and reliability of the hydraulic bushing.

[0091] By providing a channel 202 on the end face of the inner tube 2, the hydraulic bushing can be dry-filled, which easily achieves compatibility with existing production lines, thereby reducing equipment investment and increasing the cost advantage of the hydraulic bushing. In this embodiment, the tapered hole 2021 is integrally formed with the inner tube 2. Of course, in other embodiments, the tapered hole 2021 can also be machined by drilling after the inner tube 2 is die-cast.

[0092] As shown in Figure 9, in this embodiment, a buffer portion extending into the opening is provided at the bottom of the first recess 302. Referring to Figures 3, 9, and 14, this buffer portion covers one of the protrusions 201 on the inner tube 2. As shown in Figure 3, in this embodiment, the first limiting block 401 and the buffer portion have a gap in their natural state. During movement, they come into contact with each other. When the vehicle faces a high-force impact, the buffer portion and the protrusion 201 at that location act as a buffer zone 306, effectively providing cushioning and improving overall vehicle comfort.

[0093] To improve the cushioning effect, in a preferred embodiment of this invention, the elastic body 3 is provided with a plurality of protrusions 307 arranged at intervals, corresponding to the limiting block. Specifically, as shown in Figures 9 and 10, the outer peripheral surface of the buffer portion and the bottom of the second recess 303 are both provided with a plurality of protrusions 307 arranged at intervals. In this embodiment, the protrusions 307 are constructed in a spherical shape. The plurality of protrusions 307 form another buffer zone 306, which can effectively eliminate collision noise caused by excessive force.

[0094] Furthermore, for weight reduction, a weight-reducing section is provided on the side of the limiting block that abuts against the outer tube 1. This weight-reducing section includes multiple weight-reducing grooves 4015, which are connected by airflow channels 4014. The limiting block is provided with an air outlet 4013 connecting the weight-reducing section and the liquid chamber. As a specific implementation of this embodiment, as shown in Figures 7 and 8, both the first limiting block 401 and the second limiting block 402 have multiple weight-reducing grooves 4015 spaced apart, which conforms to the vehicle's lightweight design, reduces carbon emissions, achieves a high proportion of material recycling, and meets environmental design requirements.

[0095] To avoid abnormal noise from the hydraulic bushing, the first limiting block 401 will be used as an example. As shown in Figures 7 and 8, both ends of the weight-reducing grooves 4015 are provided with vent holes 4013 for connecting to the first liquid chamber 6. Furthermore, to improve the performance, a connecting airflow channel 4014 is provided to ensure that after the internal air is extracted through the vent holes 4013 before filling, the damping fluid is transported to each weight-reducing groove 4015 through the airflow channel 4014, thereby ensuring that there is no air in the liquid chamber and no abnormal noise during the use of the hydraulic bushing.

[0096] To improve the stiffness of the elastomer 3, a die-cast skeleton 5 is embedded within the elastomer 3 in this embodiment. The skeleton 5 includes two end portions located at both ends of the limiting structure 4, and a connecting portion connecting the two end portions. As a specific implementation of this embodiment, the skeleton 5 is made of aluminum alloy to achieve lightweighting, reduce carbon emissions, achieve a high proportion of material recycling, and meet environmental design requirements.

[0097] Referring to Figures 3, 5, and 15, the frame 5 in this embodiment is integrally formed by die casting. In this embodiment, the two end portions are constructed as rings 501 embedded at the upper and lower ends of the elastic body 3. The connecting portion consists of ribs 502 connected to and embedded within the elastic body 3. In this embodiment, to balance the force, two ribs 502 are symmetrically arranged, and these ribs 502 are arranged along the Z-direction of the hydraulic bushing, which is also the X-direction of the vehicle body. This improves the Z-direction dynamic stiffness of the hydraulic bushing, thereby enhancing vehicle comfort on uneven road surfaces.

[0098] The frame 5 provides support for the elastomer 3. The rings 501 at both ends of the elastomer 3 can maintain the roundness of the elastomer 3 and ensure the uniformity of compression of the elastomer 3 after assembly, thereby effectively avoiding the leakage of damping fluid due to damage to the elastomer 3.

[0099] By setting the aforementioned stiffener 502, the radial stiffness of the frame 5 can be effectively improved, which is beneficial to the handling tuning of the vehicle chassis and expands the performance design space of the structure. In this embodiment, one of the stiffeners 502 is located at the interval 403 between the first limiting block 401 and the second limiting block 402, that is, embedded in the aforementioned dividing position 304.

[0100] Furthermore, by setting the stiffener 502 to support the position of the aforementioned blocking block 305, the elastic body 3 at that location is prevented from undergoing large deformation when the damping fluid is under excessive pressure. This also increases the range of the ratio of axial stiffness to radial stiffness of the hydraulic bushing, which is beneficial for the overall vehicle chassis handling adjustment.

[0101] To prevent misalignment between the elastomer 3 and the skeleton 5, in a preferred embodiment, at least one end of the skeleton 5 is provided with a positioning hole 503, which penetrates the elastomer 3. As shown in Figure 15, in this embodiment, two through positioning holes 503 are respectively provided at the upper and lower ends of the skeleton 5, located at the positions of the two stiffeners 502. These positioning holes 503 facilitate fixing the skeleton 5 in a fixed position within the elastomer 3, eliminating fluctuations between parts and increasing stability. Of course, in other embodiments, the positioning hole 503 can also be provided at one end of the skeleton 5.

[0102] Furthermore, in this embodiment, the outer tube 1 is assembled with the elastomer 3 by press fitting. As a preferred embodiment, at least one end of the outer tube 1 is provided with a retaining edge 101 that blocks the outside of the frame 5. As shown in Figures 3 and 4, specifically, both ends of the outer tube 1 are provided with inwardly inclined retaining edges 101. The assembled outer tube 1 forms an undercut mechanism for the elastomer 3, thereby effectively preventing the elastomer 3 from coming off and improving the stability of the hydraulic bushing. Of course, for ease of assembly, the retaining edge 101 can also be provided only at one end of the outer tube 1, while the other end can be easily assembled with the outer tube 1, and the cap structure can be used to prevent detachment.

[0103] In this embodiment, the outer tube 1 is tightly fitted with the elastic body 3, the first limiting block 401, and the second limiting block 402, which fully ensures that there is no internal leakage during the movement of the damping fluid, thereby ensuring the accuracy and stability of the dynamic damping and frequency of the hydraulic bushing.

[0104] In summary, the hydraulic bushing provided in this embodiment changes the fixed characteristics of traditional bushing damping. By setting the limiting structure 4 and the blocking structure as described above, the hydraulic bushing can obtain different damping characteristics under different vehicle conditions, thereby providing better vehicle handling and comfort and improving the driving experience.

[0105] This embodiment also relates to a vehicle equipped with the aforementioned hydraulic bushing.

[0106] By installing the aforementioned hydraulic bushings, the vehicle in this embodiment can improve overall vehicle handling and comfort, thereby enhancing the driving experience.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic bushing, characterized in that: The device includes an outer tube (1), an inner tube (2), and an elastic body (3) connecting the outer tube (1) and the inner tube (2). A cavity is formed between the elastic body (3) and the outer tube (1), and a limiting structure (4) that abuts against the outer tube (1) is provided in the cavity. The elastic body (3) is a rotating body, and a receiving cavity for accommodating the inner tube (2) is provided at the center of the elastic body (3). The elastic body (3) has a first recess that is recessed inward from the outer periphery of the elastic body (3) and is disposed opposite to it. The first recess (302) and the second recess (303) form two liquid chambers between the two limiting blocks. The first recess (302) and the second recess (303) are "V"-shaped structures that gradually expand towards the outer periphery of the elastic body (3), and rounded corners are designed at the sharp corners of the "V"-shaped structures. The limiting structure (4) has two limiting blocks that extend to both sides of the elastic body (3), and the two limiting blocks are connected to the elastic body (3). Two liquid chambers are formed between the elastic body (3) respectively, and the limiting structure (4) is provided with a flow channel connecting the two liquid chambers; one end of the two limiting blocks is connected to form a connecting end (404), and the other end is spaced to form a spacer end (403). The flow channel meanders from the connecting end (404) of the two limiting blocks to the spacer end (403), and then back to the connecting end (404); the elastic body (3) has a blocking structure placed between the two liquid chambers, and the blocking structure has corresponding two Each of the liquid chambers is provided with a blocking block (305); when the pressure of the damping liquid in one of the liquid chambers is greater than a preset threshold, it can squeeze the corresponding blocking block (305) to deform, so that the damping liquid passes over the blocking block (305) and flows to the other liquid chamber; the blocking block (305) is provided with a guide slope (3051) inclined towards the corresponding liquid chamber, and a cavity (3052) is formed inside the blocking block (305), and the cavity (3052) has an opening towards the other liquid chamber.

2. The hydraulic bushing according to claim 1, characterized in that: The inner tube (2) includes a first protrusion (201a) that bulges outward in the radial direction and a second protrusion (201b) located on the opposite side of the first protrusion (201a); the second protrusion (201b) is provided with a channel (202) communicating with one of the liquid chambers thereon, and a steel ball (12) is sealed in the channel (202).

3. The hydraulic bushing according to claim 2, characterized in that: The inner tube (2) is die-cast; and / or, relative to one end of the channel (202) that communicates with the liquid chamber, the other end of the channel (202) is configured as a conical hole (2021), and the steel ball (12) is press-fitted into the conical hole (2021).

4. The hydraulic bushing according to claim 1, characterized in that: Corresponding to the limiting block, the elastic body (3) is provided with a plurality of protrusions (307) arranged at intervals; and / or, the side of the limiting block that abuts against the outer tube (1) is provided with a weight-reducing part, the weight-reducing part including a plurality of weight-reducing grooves (4015), the plurality of weight-reducing grooves (4015) being connected to each other through an airflow channel (4014), and the limiting block is provided with an air outlet (4013) connecting the weight-reducing part and the liquid chamber.

5. The hydraulic bushing according to any one of claims 1 to 4, characterized in that: The elastomer (3) is embedded with a die-cast skeleton (5), the skeleton (5) including two end portions located at both ends of the limiting structure (4) and a connecting portion connecting the two end portions.

6. The hydraulic bushing according to claim 5, characterized in that: At least one end of the skeleton (5) is provided with a positioning hole (503), which penetrates the elastic body (3).

7. The hydraulic bushing according to claim 6, characterized in that: At least one end of the outer tube (1) is provided with a retaining edge (101) that blocks the outside of the frame (5).

8. A vehicle, characterized in that: The vehicle is equipped with a hydraulic bushing as described in any one of claims 1 to 7.

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