Hydraulic bushing with double damping characteristics

Abstract

The utility model discloses a hydraulic bushing with double damping characteristics, which relates to the technical field of automobile parts and comprises a cylindrical outer cover, a main spring assembly and a runner assembly are arranged in the outer cover, and two first liquid chambers and two second liquid chambers are arranged on the outer side surface of the main spring assembly; the flow channel assembly is arranged around the outer side face of the main spring assembly, and the flow channel assembly is provided with a first flow channel used for communicating the two first liquid chambers and a second flow channel used for communicating the two second liquid chambers. The damping device has the double-damping characteristic, and the damping requirement of an existing whole vehicle can be well met by matching different damping peak values and frequency bands where damping is located.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically a hydraulic bushing with dual damping characteristics. Background Technology

[0002] Traditional hydraulic bushings have only one damping characteristic, meaning they are designed with only two fluid chambers in one direction, connected by a single flow channel. This type of hydraulic bushing with a single damping characteristic cannot meet the vibration reduction requirements of current vehicles.

[0003] Chinese patent "Suspension Structure and Vehicle" (patent application number: 202410834649.7) discloses a suspension structure that obtains damping performance by compressing one or two liquid chambers in a first radial direction and by compressing three or four liquid chambers in a second radial direction. The problem it solves is that when the rubber is compressed in either the first or second direction, damping performance can be obtained in that radial direction. In a practical example, the suspension body obtains Z-direction damping attenuation by compressing the limiting part (containing the first or second liquid chamber) during large-scale movement in the Z direction (first radial direction) and X-direction damping attenuation by compressing the limiting part (containing the third or fourth liquid chamber) during large-scale movement in the X direction (second radial direction).

[0004] Its working principle is a throttle valve type hydraulic damping system. By squeezing the liquid chamber, the liquid is forced to flow through a narrow flow channel. The throttle effect is used to convert the kinetic energy into heat energy generated by the friction between liquid macromolecules.

[0005] This structure addresses the issue of attenuation of energy from a single large impact. The liquid chamber and flow channel of its suspension structure are located on the inner wall of the outer tube frame, separate from the main rubber elastomer structure. This means that the main rubber body cannot exert a squeezing effect on the liquid chamber during its repeated movement. Only when a sufficiently large impact load drives the inner skeleton of the rubber body to squeeze the corresponding limiting part (containing the liquid chamber) of the outer skeleton can a damping attenuation effect be generated.

[0006] The damping force is generated when the rubber body impacts the limiting part during large-scale movement. Its function is only to cope with the one-time impact of large load. Its hydraulic damping system does not generate a complete frequency response curve, so it cannot solve the vibration and noise problem (between 9 and 200 Hz). Summary of the Invention

[0007] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a hydraulic bushing with dual damping characteristics. It has dual damping characteristics and can well meet the vibration reduction requirements of existing vehicles by matching different damping peak values ​​and damping frequency bands.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hydraulic bushing with dual damping characteristics, comprising a cylindrical outer cover, wherein a main spring assembly and a flow channel assembly are disposed inside the outer cover, and the outer side of the main spring assembly is provided with two first liquid chambers and two second liquid chambers; the flow channel assembly is disposed around the outer side of the main spring assembly, and the flow channel assembly is provided with a first flow channel for connecting the two first liquid chambers and a second flow channel for connecting the two second liquid chambers.

[0009] The further improvement is that the two first liquid chambers are arranged opposite each other in the transverse direction, and the two second liquid chambers are arranged opposite each other in the longitudinal direction.

[0010] A further improvement is that the main spring assembly includes an inner tube and a rubber body disposed on the outside of the inner tube. The rubber body is cylindrical, and its outer surface is provided with two opposing first liquid chambers and two opposing second liquid chambers.

[0011] A further improvement is that the outer surface of the rubber body is provided with a limiting groove adapted to the flow channel assembly, and the flow channel assembly is embedded in the limiting groove.

[0012] A further improvement is that anti-misalignment protrusions are provided at both ends of the rubber body.

[0013] A further improvement is that the main spring assembly also includes a skeleton disposed within the rubber body. The skeleton includes two opposing rings, and two connecting plates are disposed opposite each other between the two rings. The two ends of the connecting plates are respectively connected to the two rings, and the two rings and the two connecting plates form a first lateral opening corresponding to the two first liquid chambers. The connecting plates have a second lateral opening corresponding to the second liquid chamber.

[0014] A further improvement is that the flow channel assembly has an annular structure, including an arc-shaped first flow channel plate and a second flow channel plate. The first flow channel plate is provided with a first flow channel port for connecting to the corresponding first liquid chamber and a second flow channel port for connecting to the corresponding second liquid chamber. The second flow channel plate is provided with a third flow channel port for connecting to the corresponding first liquid chamber and a fourth flow channel port for connecting to the corresponding second liquid chamber.

[0015] A further improvement is that the openings at both ends of the outer cover are narrowed inward to form anti-slip openings.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention features four liquid chambers and two flow channels in one direction, thus exhibiting dual damping characteristics in the same direction. By combining different damping peak values ​​and frequency ranges, it can effectively meet the vibration reduction requirements of existing vehicles. For example, setting the low-frequency damping peak frequency to 12-20Hz solves braking vibration and front wheel sway; setting the high-frequency damping peak frequency to 30-40Hz solves acoustic roughness issues. Similarly, setting the low-frequency damping peak frequency to 30-40Hz solves acoustic roughness issues; setting the high-frequency damping peak frequency to 90-110Hz (with the dynamic stiffness trough at 100Hz) solves 100Hz road noise issues.

[0018] This utility model patent arranges four liquid chambers, where the first and second liquid chambers are the same, and the third and fourth liquid chambers are the same as the second liquid chamber. When the rubber body undergoes repeated motion (vibration) in a single radial direction (the main direction of motion of the rubber body), these four liquid chambers form two sets of coupled inertial liquid column hydraulic damping systems through special structural channels of different lengths and cross-sections. They provide high damping (vibration suppression) or low dynamic stiffness (vibration isolation) in different frequency bands in the same direction. The actual problem it solves is that the low-frequency hydraulic damping solves the front and rear resonance problem of the suspension (front wheel sway, etc.), and the high-frequency hydraulic damping is used to block the transmission path of acoustic roughness. This structure is used to solve complex NVH problems.

[0019] This utility model patent utilizes a specially designed main rubber body shape, which forms four liquid chambers in conjunction with the outer frame. When the rubber body reciprocates, different internal pressure changes occur between the four liquid chambers, driving the inertial liquid columns in two different flow channels to reciprocate and generate a damping attenuation effect.

[0020] The working principle of this utility model patent is an inertial liquid column type hydraulic damping system, which forms and encloses the volume stiffness of the liquid chamber and the mass of the inertial liquid column within a rubber elastic body as an independent sub-vibration system. The natural frequency of the sub-vibration system resonates with the excitation frequency, thereby attenuating the vibration energy of the elastic body to achieve the vibration suppression effect.

[0021] This utility model patent, based on the traditional dual-chamber single-inertial-channel hydraulic damping vibration reduction, adopts a special rubber body structure design and flow channel design to form a four-chamber dual-inertial-channel configuration. When the rubber body reciprocates in the main motion direction, it can excite two different sets of inertial channel vibrations. Through targeted design, two hydraulic damping vibration reduction systems with different frequency bands can be used to deal with two different NVH problems. Attached Figure Description

[0022] Figure 1 This is a perspective view of the dual-damping hydraulic bushing in an embodiment of the present invention.

[0023] Figure 2This is a front view of the dual-damping hydraulic bushing in an embodiment of this utility model;

[0024] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0025] Figure 4 This is a top view of the dual-damping hydraulic bushing in an embodiment of this utility model;

[0026] Figure 5 for Figure 4 Sectional view along the BB direction;

[0027] Figure 6 for Figure 4 A cross-sectional view along the CC direction;

[0028] Figure 7 This is a perspective view of the main spring assembly in an embodiment of this utility model;

[0029] Figure 8 This is a front view of the main spring assembly in an embodiment of this utility model;

[0030] Figure 9 This is a side view of the main spring assembly in an embodiment of the present invention;

[0031] Figure 10 This is a top view of the main spring assembly in an embodiment of this utility model;

[0032] Figure 11 for Figure 10 Sectional view along the DD direction;

[0033] Figure 12 for Figure 10 A sectional view along the EE direction;

[0034] Figure 13 This is a perspective view of the skeleton in an embodiment of the present utility model;

[0035] Figure 14 This is a schematic diagram of the flow channel assembly in an embodiment of the present invention;

[0036] Figure 15 This is a perspective view of the first flow channel plate in an embodiment of this utility model;

[0037] Figure 16 This is a front view of the first flow channel plate in an embodiment of this utility model;

[0038] Figure 17 This is a bottom view of the first flow channel plate in an embodiment of this utility model;

[0039] Figure 18 This is a perspective view of the second flow channel plate in an embodiment of this utility model;

[0040] Figure 19 This is a front view of the second flow channel plate in an embodiment of this utility model;

[0041] Figure 20 This is a top view of the second flow channel plate in an embodiment of this utility model;

[0042] Figure 21 This is a schematic diagram of the damping characteristics of a traditional hydraulic bushing.

[0043] Figure 22 This is a schematic diagram of the damping characteristics of the dual-damping hydraulic bushing in an embodiment of this utility model.

[0044] Figure label:

[0045] 1-Outer cover;

[0046] 2-Main spring assembly; 21-First liquid chamber; 22-Second liquid chamber; 23-Inner tube; 24-Rubber body; 25-Skeleton; 251-Ring; 252-Connecting plate; 253-First lateral opening; 254-Second lateral opening;

[0047] 3-Flow channel assembly; 31-First flow channel; 32-Second flow channel; 33-First flow channel plate; 34-First flow channel inlet; 35-Second flow channel inlet; 36-Second flow channel plate; 37-Third flow channel inlet; 38-Fourth flow channel inlet. Detailed Implementation

[0048] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0049] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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. They should not be construed as limiting the specific protection scope of this utility model.

[0050] 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. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0051] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0052] See Figures 1-6 As shown, this embodiment of the utility model provides a dual-damping hydraulic bushing, including a cylindrical outer cover 1. A main spring assembly 2 and a flow channel assembly 3 are disposed inside the outer cover 1. Two first liquid chambers 21 and two second liquid chambers 22 are disposed on the outer surface of the main spring assembly 2. The flow channel assembly 3 is disposed around the outer surface of the main spring assembly 2, and the flow channel assembly 3 is provided with a first flow channel 31 for connecting the two first liquid chambers 21 and a second flow channel 32 for connecting the two second liquid chambers 22. Specifically, the two first liquid chambers 21 are arranged opposite each other in the transverse direction, and the two second liquid chambers 22 are arranged opposite each other in the longitudinal direction. Both ends of the outer cover 1 are inwardly contracted to form anti-detachment openings.

[0053] See Figures 7-12 As shown, the main spring assembly 2 includes an inner tube 23 and a rubber body 24 disposed outside the inner tube 23. The rubber body 24 is cylindrical, and its outer surface is provided with two opposing first liquid chambers 21 and two opposing second liquid chambers 22. Specifically, the outer surface of the rubber body 24 is provided with a limiting groove adapted to the flow channel assembly 3, and the flow channel assembly 3 is embedded in the limiting groove. Anti-misalignment protrusions are provided at both ends of the rubber body 24.

[0054] See Figure 13 As shown, the main spring assembly 2 also includes a frame 25 disposed within the rubber body 24. The frame 25 includes two opposing rings 251, and two connecting plates 252 are disposed opposite to each other between the two rings 251. The two ends of the connecting plates 252 are respectively connected to the two rings 251, and the two rings 251 and the two connecting plates 252 form a first lateral opening 253 corresponding to the two first liquid chambers 21. The connecting plates 252 have a second lateral opening 254 corresponding to the second liquid chamber 22.

[0055] See Figures 14-20As shown, the flow channel assembly 3 has an annular structure, including an arc-shaped first flow channel plate 33 and a second flow channel plate 36. The first flow channel plate 33 is provided with a first flow channel port 34 for connecting to the corresponding first liquid chamber 21 and a second flow channel port 35 for connecting to the corresponding second liquid chamber 22. The second flow channel plate 36 is provided with a third flow channel port 37 for connecting to the corresponding first liquid chamber 21 and a fourth flow channel port 38 for connecting to the corresponding second liquid chamber 22.

[0056] See Figures 21-22 As shown, this invention features four liquid chambers and two flow channels in one direction, thus exhibiting dual damping characteristics in the same direction. By combining different damping peak values ​​and frequency ranges, it can effectively meet the vibration reduction requirements of existing vehicles. For example, setting the low-frequency damping peak frequency to 12-20Hz solves braking vibration and front wheel sway; setting the high-frequency damping peak frequency to 30-40Hz solves acoustic and vibration roughness problems. Similarly, setting the low-frequency damping peak frequency to 30-40Hz solves acoustic and vibration roughness problems; setting the high-frequency damping peak frequency to 90-110Hz (with the dynamic stiffness trough at 100Hz) solves 100Hz road noise problems.

[0057] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. A hydraulic bushing with double damping characteristics, comprising a cylindrical outer cover (1) in which a main spring assembly (2) and a flow channel assembly (3) are arranged, characterized in that: The outer side of the main spring assembly (2) is provided with two first liquid chambers (21) and two second liquid chambers (22); the flow channel assembly (3) is arranged around the outer side of the main spring assembly (2), and the flow channel assembly (3) is provided with a first flow channel (31) for connecting the two first liquid chambers (21) and a second flow channel (32) for connecting the two second liquid chambers (22).

2. The hydraulic bushing with dual damping characteristics according to claim 1, characterized in that: The two first liquid chambers (21) are arranged opposite each other in the transverse direction, and the two second liquid chambers (22) are arranged opposite each other in the longitudinal direction.

3. The hydraulic bushing with dual damping characteristics according to claim 1, characterized in that: The main spring assembly (2) includes an inner tube (23) and a rubber body (24) disposed on the outside of the inner tube (23). The rubber body (24) is cylindrical, and the outer surface of the rubber body (24) is provided with two opposing first liquid chambers (21) and two opposing second liquid chambers (22).

4. The hydraulic bushing with dual damping characteristics according to claim 3, characterized in that: The outer side of the rubber body (24) is provided with a limiting groove that is adapted to the flow channel assembly (3), and the flow channel assembly (3) is embedded in the limiting groove.

5. The hydraulic bushing with dual damping characteristics according to claim 3, characterized in that: The rubber body (24) is provided with anti-misalignment protrusions at both ends.

6. The hydraulic bushing with dual damping characteristics according to claim 1, characterized in that: The main spring assembly (2) also includes a frame (25) disposed in the rubber body (24). The frame (25) includes two oppositely disposed rings (251), and two connecting plates (252) are disposed opposite to each other between the two rings (251). The two ends of the connecting plates (252) are respectively connected to the two rings (251), and the two rings (251) and the two connecting plates (252) form a first lateral opening (253) corresponding to the two first liquid chambers (21). The connecting plates (252) have a second lateral opening (254) corresponding to the second liquid chamber (22).

7. The hydraulic bushing with dual damping characteristics according to claim 1, characterized in that: The flow channel assembly (3) has an annular structure, including an arc-shaped first flow channel plate (33) and a second flow channel plate (36). The first flow channel plate (33) is provided with a first flow channel port (34) for connecting to the corresponding first liquid chamber (21) and a second flow channel port (35) for connecting to the corresponding second liquid chamber (22). The second flow channel plate (36) is provided with a third flow channel port (37) for connecting to the corresponding first liquid chamber (21) and a fourth flow channel port (38) for connecting to the corresponding second liquid chamber (22).

8. The hydraulic bushing with dual damping characteristics according to claim 1, characterized in that: The openings at both ends of the outer cover (1) are both contracted inward to form anti-slip openings.

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