A double vibration isolation bushing for a vehicle

Abstract

The application discloses a double-vibration-isolation bushing of an automobile and belongs to the technical field of automobile parts. The double-vibration-isolation bushing comprises an outer sleeve, a rubber part, a mass part and an inner core. The mass part and the outer sleeve are in a cylindrical structure. The inner core, the mass part and the outer sleeve are coaxially arranged. The mass part is sleeved outside the inner core, and the mass part and the inner core are connected through the rubber part. The outer sleeve is sleeved outside the mass part, and the outer sleeve and the mass part are connected through the rubber part. The outer circumferential surface of the inner core is axially provided with a plurality of convex edges. The inner wall surface of the outer sleeve is provided with a receiving surface corresponding to the convex edges. The application effectively suppresses high-frequency vibration, improves the vibration isolation performance and improves the NVH performance of the automobile through the introduction of the mass part and the multi-layer structure design.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and in particular to a dual vibration isolation bushing for automobiles. Background Technology

[0002] Bushings are key components in automotive suspension systems, widely used in control arms, stabilizer bars, and other locations. Their main function is to connect and transmit loads and dampen vibrations, which is crucial to the overall NVH (noise, vibration, and harshness) performance, handling stability, and ride comfort of the vehicle.

[0003] Currently, bushings are widely used in automobiles. Relevant existing technologies, such as the Chinese patent application "A Front Suspension Bushing" (application number: 201821910878.9), disclose a bushing comprising an inner core, rubber, and a outer shell. The rubber is fitted outside the inner core, and the outer shell is fitted outside the rubber. The rubber includes an inner ring rubber, an outer ring rubber, and a connecting rubber. The inner and outer ring rubbers are fixedly connected by the connecting rubber. A first limiting groove is provided on the inner wall of the inner ring rubber, and a first limiting protrusion is provided within the first limiting groove. The inner core is installed inside the inner ring rubber. A second limiting protrusion is provided on the outer wall of the inner core, and a second limiting groove is provided within the second limiting protrusion. The second limiting protrusion is installed within the first limiting groove, and the first limiting protrusion is installed within the second limiting groove. During production, the inner core and the limiting block are integrally molded, reducing the tooling required for installing the limiting block and the inner core, improving production efficiency, and reducing production costs.

[0004] The bushing involved in this application is used to connect the motor to the vehicle body, serving to fix, limit, and dampen vibrations. Existing suspension bushings are all made of pure rubber or hydraulically. However, in the field of electric vehicles, the motor operates in a relatively wide high-frequency range, generally reaching above 2500Hz. High-frequency conditions can cause the rubber of the motor suspension to resonate, resulting in increased rubber stiffness and thus causing high-frequency whistling from the motor, affecting normal operation. Utility Model Content

[0005] The technical problem to be solved by this application is to provide a double vibration isolation bushing for automobiles, which effectively suppresses high-frequency vibration, improves vibration isolation performance, and improves the NVH performance of automobiles through multi-layer structure design and the introduction of mass components.

[0006] The technical solution adopted in this application is as follows: a double vibration isolation bushing for automobiles, comprising an outer sleeve, a rubber component, a mass component, and an inner core. The mass component and the outer sleeve are both cylindrical structures. The inner core, the mass component, and the outer sleeve are coaxially arranged. The mass component is sleeved outside the inner core and connected to the inner core through a rubber component. The outer sleeve is sleeved outside the mass component and connected to the mass component through a rubber component. Several protruding ridges are arranged axially on the outer peripheral surface of the inner core, and a bearing surface is provided on the inner wall surface of the outer sleeve corresponding to the protruding ridges.

[0007] Compared with existing technologies, the advantages of this application are as follows: First, this application forms a special structure by adding a mass component between the inner core and the outer sleeve, with the mass component connected to both the inner core and the outer sleeve via rubber components. When the motor generates high-frequency vibrations, the mass component can act as an inertial element to a certain extent, absorbing and dispersing some of the high-frequency vibration energy. Simultaneously, the elastic properties of the rubber components can further buffer and attenuate the vibrations, thereby effectively reducing the transmission efficiency of high-frequency vibrations. Compared with traditional pure rubber or hydraulic suspension bushings, this structure can significantly reduce the transmission of high-frequency vibrations (such as above 2500Hz) to the vehicle body, avoiding the increased stiffness and high-frequency whine of the motor caused by rubber resonance at high frequencies, and improving the NVH performance of the vehicle in high-frequency vibration environments.

[0008] Secondly, this application comprises an inner core, a mass component, rubber components, and an outer jacket, forming a multi-layer vibration isolation structure. The inner core and the mass component, as well as the mass component and the outer jacket, are connected via rubber components. During vibration transmission, it undergoes multiple damping and buffering processes through different media (rubber and mass component), consuming some vibration energy with each transmission. This multi-layer vibration isolation design effectively isolates vibrations in different frequency bands, suppressing not only high-frequency vibrations but also providing good attenuation for mid- and low-frequency vibrations. This comprehensively improves the vibration isolation performance of the bushing, better meeting the vibration control requirements of automobiles under different operating conditions and enhancing the overall vehicle ride comfort.

[0009] In some embodiments of this application, the rubber component includes an inner ring rubber, a middle ring rubber, and an outer ring rubber. The inner core is installed inside the inner ring rubber, the middle ring rubber wraps around the inner and outer walls of the mass component, and the outer ring rubber is lined with the inner wall of the outer jacket.

[0010] The layered rubber design described above provides more precise vibration control. The inner rubber ring primarily handles the initial buffering between the inner core and the mass component, the middle rubber ring further disperses and absorbs vibration energy, and the outer rubber ring provides the final buffering and isolation. This multi-layered buffering structure can more effectively attenuate vibrations of different frequencies, improving overall vibration isolation performance.

[0011] In some embodiments of this application, the inner ring rubber and the middle ring rubber are connected by an inner connecting rubber; the outer ring rubber and the middle ring rubber are connected by an outer connecting rubber.

[0012] The use of inner and outer connecting rubbers further enhances the connection strength and overall integrity between the rubber components. This connection method ensures that there is no relative displacement between the rubber layers during vibration transmission, thereby guaranteeing the stability and reliability of the bushing, and also helps to distribute and attenuate vibration energy more evenly.

[0013] In some embodiments of this application, the inner connecting rubber is a rod-shaped or block-shaped structure, and the inner connecting rubber is located between two adjacent convex ridges.

[0014] Placing the inner connecting rubber between adjacent protruding ridges fully utilizes the structural characteristics of the ridges, enhancing the connection stability between the inner core and the mass component. This layout not only improves the structural strength of the bushing but also better disperses and absorbs vibration energy during vibration transmission, further enhancing the vibration isolation effect.

[0015] In some embodiments of this application, the outer connecting rubber is a rod-shaped or block-shaped structure, and the outer connecting rubber is arranged corresponding to the inner connecting rubber, with the outer connecting rubber and the inner connecting rubber located on a straight line.

[0016] The symmetrical arrangement of the outer and inner connecting rubbers ensures uniform stress on the bushing in all directions, avoiding uneven vibration transmission caused by asymmetrical design. This symmetrical design helps improve the overall stability and vibration isolation performance of the bushing, ensuring good vibration control even under complex operating conditions.

[0017] In some embodiments of this application, the cross-section of the protruding ridge is trapezoidal, the protruding ridge includes a short side surface and a long side surface, the short side surface of the protruding ridge is adjacent to the outer peripheral surface of the inner core, and the long side surface of the protruding ridge is disposed towards the mass block.

[0018] The convex ridge design of the trapezoidal cross-section provides better structural strength and stability. Furthermore, during vibration transmission, the trapezoidal structure better disperses and absorbs vibration energy. The close fit between the short side and the outer circumference of the inner core, along with the long side facing the mass block, further enhances the connection stability between the inner core and the mass component, improving the overall performance of the bushing.

[0019] In some embodiments of this application, a gap exists between the protruding ridge and the mass block. This gap prevents direct contact between the ridge and the mass block during vibration, thereby reducing additional vibration and noise caused by contact friction. This gap design helps to further reduce vibration transmission efficiency and improve the vibration isolation performance of the bushing.

[0020] In some embodiments of this application, the outer peripheral surface of the inner core is regularly provided with four protruding ridges, and the outer peripheral surface of the inner core is provided with four internal connecting rubbers, which are arranged in an X-shape.

[0021] The regularly arranged four convex ridges and the X-shaped internal connecting rubber provide more uniform support and connection. The X-shaped internal connecting rubber can evenly distribute vibration energy in all directions, enhancing the overall stability and vibration isolation performance of the bushing, while also helping to improve the structural strength and reliability of the bushing.

[0022] In some embodiments of this application, the inner wall of the outer jacket is provided with four receiving surfaces corresponding to the protruding ridges, and the receiving surfaces are flat or raised curved surfaces; wherein at least one receiving surface is provided with multiple weight-reducing grooves on the outer wall of the outer jacket.

[0023] The weight-reducing grooves effectively reduce the weight of the outer jacket and the overall mass of the bushing, thereby improving the dynamic performance and response speed of the bushing and further enhancing the vibration isolation effect.

[0024] In some embodiments of this application, the outer ring rubber surface covering the bearing surface is provided with a wavy texture. The wavy texture of the outer ring rubber surface can increase the friction of the rubber at this location. At the same time, the wavy texture can generate a slight damping effect during vibration transmission, further attenuating vibration energy and improving the vibration isolation performance of the bushing.

[0025] Based on common knowledge in the field, the above-described embodiments can be combined arbitrarily. Attached Figure Description

[0026] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0027] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a top view of this application; Figure 3 for Figure 2 Sectional view of section AA; Figure 4 This is a side view of this application; Figure 5 for Figure 4 A sectional view of section BB in the middle.

[0028] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Outer jacket; 2. Rubber part; 3. Weight part; 4. Inner core; 5. Inner ring rubber; 6. Middle ring rubber; 7. Outer ring rubber; 8. Inner connecting rubber; 9. Outer connecting rubber; 11. Raised ridge; 12. Receiving surface; 13. Weight reduction groove; 14. Wavy texture. Detailed Implementation

[0029] The present application will now be described in detail with reference to the accompanying drawings.

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0031] A dual vibration isolation bushing for automobiles, as described in Embodiment 1 Figure 1 As shown, the structure includes an outer jacket 1, a rubber component 2, a mass component 3, and an inner core 4. Both the mass component 3 and the outer jacket 1 are cylindrical structures. The inner core 4, the mass component 3, and the outer jacket 1 are coaxially arranged. This application comprises the inner core 4, the mass component 3, the rubber component 2, and the outer jacket 1, forming a multi-layer vibration isolation structure. During vibration transmission, it needs to undergo damping and buffering multiple times through different media (rubber and mass component 3), and each transmission consumes a portion of the vibration energy.

[0032] This multi-layer vibration isolation design can effectively isolate vibrations in different frequency bands. It not only suppresses high-frequency vibrations but also has a good attenuation effect on mid- and low-frequency vibrations, thereby comprehensively improving the vibration isolation performance of the bushing, better meeting the vibration control requirements of automobiles under different operating conditions, and improving the overall ride comfort of the vehicle.

[0033] The mass component 3 is fitted outside the inner core 4, and the mass component 3 and the inner core 4 are connected by a rubber component 2. The outer sleeve 1 is fitted outside the mass component 3, and the outer sleeve 1 and the mass component 3 are connected by a rubber component 2. Several protruding ribs 11 are axially arranged on the outer circumferential surface of the inner core 4, and a receiving surface 12 is provided on the inner wall of the outer sleeve 1 corresponding to the protruding ribs 11. When the motor generates high-frequency vibration, the mass component 3 can, to a certain extent, act as inertia, absorbing and dispersing some of the high-frequency vibration energy. Simultaneously, the elastic properties of the rubber component 2 can further buffer and attenuate the vibration, thereby effectively reducing the transmission efficiency of high-frequency vibration.

[0034] Example 2, as Figures 1 to 5 As shown, the rubber component 2 includes an inner ring rubber 5, a middle ring rubber 6, and an outer ring rubber 7. The inner core 4 is installed inside the inner ring rubber 5, the middle ring rubber 6 wraps around the inner and outer walls of the mass component 3, and the outer ring rubber 7 is lined with the inner wall of the outer jacket 1. This layered rubber design provides more precise vibration control. The inner ring rubber 5 mainly provides initial buffering between the inner core 4 and the mass component 3, the middle ring rubber 6 further disperses and absorbs vibration energy, and the outer ring rubber 7 provides final buffering and isolation. This multi-layered buffering structure can more effectively attenuate vibrations of different frequencies and improve overall vibration isolation performance.

[0035] The inner ring rubber 5 and the middle ring rubber 6 are connected by an inner connecting rubber 8; the outer ring rubber 7 and the middle ring rubber 6 are connected by an outer connecting rubber 9. The inner connecting rubber 8 and the outer connecting rubber 9 further enhance the connection strength and overall integrity between the rubber components 2. This connection method ensures that no relative displacement occurs between the rubber layers during vibration transmission, thus guaranteeing the stability and reliability of the bushing, and also helps to distribute and attenuate vibration energy more evenly.

[0036] The inner connecting rubber 8 has a rod-shaped or block-shaped structure and is located between two adjacent protruding ridges 11. Placing the inner connecting rubber 8 between adjacent protruding ridges 11 fully utilizes the structural characteristics of the ridges 11, enhancing the connection stability between the inner core 4 and the mass component 3. This layout not only improves the structural strength of the bushing but also better disperses and absorbs vibration energy during vibration transmission, further enhancing the vibration isolation effect.

[0037] The outer connecting rubber 9 has a rod-shaped or block-shaped structure and is positioned corresponding to the inner connecting rubber 8, with the two rubbers aligned in a straight line. This symmetrical arrangement of the outer and inner connecting rubbers ensures uniform stress on the bushing in all directions, avoiding uneven vibration transmission caused by asymmetrical design. This symmetrical design helps improve the overall stability and vibration isolation performance of the bushing, ensuring good vibration control even under complex operating conditions.

[0038] The cross-section of the protruding rib 11 is trapezoidal, and the rib 11 includes a short side and a long side. The short side of the rib 11 is flush with the outer circumferential surface of the inner core 4, while the long side of the rib 11 faces the mass block. The trapezoidal cross-section design of the rib 11 provides better structural strength and stability. Furthermore, during vibration transmission, the trapezoidal structure can better disperse and absorb vibration energy. The close fit between the short side and the outer circumferential surface of the inner core 4, and the orientation of the long side towards the mass block, further enhance the connection stability between the inner core 4 and the mass component 3, improving the overall performance of the bushing.

[0039] There is a gap between the protruding ridge 11 and the mass block. This gap prevents direct contact between the ridge 11 and the mass block during vibration, thereby reducing additional vibration and noise caused by contact friction. This gap design helps to further reduce vibration transmission efficiency and improve the vibration isolation performance of the bushing.

[0040] The outer circumferential surface of the inner core 4 is regularly arranged with four protruding ridges 11, and four internal connecting rubbers 8 are provided on the outer circumferential surface of the inner core 4 in an X-shape. The regularly arranged protruding ridges 11 and the X-shaped internal connecting rubbers 8 can provide a more uniform support and connection effect. The X-shaped internal connecting rubbers 8 can evenly distribute vibration energy in all directions, enhance the overall stability and vibration isolation performance of the bushing, and also help improve the structural strength and reliability of the bushing.

[0041] The inner wall of the outer jacket 1 is provided with four bearing surfaces 12 corresponding to the protruding ridge 11. The bearing surfaces 12 are either flat or raised curved surfaces. At least one of the bearing surfaces 12 has multiple weight-reducing grooves 13 on the outer wall of the outer jacket 1. The weight-reducing grooves 13 can effectively reduce the weight of the outer jacket 1, reduce the overall mass of the bushing, thereby improving the dynamic performance and response speed of the bushing, and further enhancing the vibration isolation effect.

[0042] The outer ring rubber 7 covering the bearing surface 12 has a wavy texture. The wavy texture 14 on the outer ring rubber 7 surface can increase the friction of the rubber at this point. At the same time, the wavy texture 14 can generate a slight damping effect during vibration transmission, further attenuating vibration energy and improving the vibration isolation performance of the bushing.

[0043] The rest of the contents of Example 2 are the same as those of Example 1.

[0044] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A double vibration isolation bushing for automobiles, characterized in that, It includes an outer shell (1), a rubber component (2), a mass component (3), and an inner core (4). The mass component (3) and the outer shell (1) are both cylindrical. The inner core (4), the mass component (3), and the outer shell (1) are coaxially arranged. The mass component (3) is sleeved outside the inner core (4). The mass component (3) and the inner core (4) are connected by the rubber component (2). The outer shell (1) is sleeved outside the mass component (3). The outer shell (1) and the mass component (3) are connected by the rubber component (2). Several protruding ridges (11) are arranged axially on the outer peripheral surface of the inner core (4). The inner wall of the outer shell (1) is provided with a bearing surface (12) corresponding to the protruding ridges (11).

2. The dual vibration isolation bushing for automobiles according to claim 1, characterized in that, The rubber component (2) includes an inner ring rubber (5), a middle ring rubber (6) and an outer ring rubber (7). The inner core (4) is installed inside the inner ring rubber (5), the middle ring rubber (6) is wrapped around the inner and outer walls of the mass component (3), and the outer ring rubber (7) is lined with the inner wall of the outer jacket (1).

3. The dual vibration isolation bushing for automobiles according to claim 2, characterized in that, The inner ring rubber (5) and the middle ring rubber (6) are connected by an inner connecting rubber (8); the outer ring rubber (7) and the middle ring rubber (6) are connected by an outer connecting rubber (9).

4. The dual vibration isolation bushing for automobiles according to claim 3, characterized in that, The inner connecting rubber (8) has a rod-shaped or block-shaped structure and is located between two adjacent protruding ridges (11).

5. The dual vibration isolation bushing for automobiles according to claim 4, characterized in that, The outer connecting rubber (9) is a rod-shaped or block-shaped structure. The outer connecting rubber (9) is set in relation to the inner connecting rubber (8), and the outer connecting rubber (9) and the inner connecting rubber (8) are located on a straight line.

6. The dual vibration isolation bushing for automobiles according to claim 1, characterized in that, The cross-section of the protruding ridge (11) is trapezoidal. The protruding ridge (11) includes a short side surface and a long side surface. The short side surface of the protruding ridge (11) is adjacent to the outer peripheral surface of the inner core (4). The long side surface of the protruding ridge (11) is set towards the mass block.

7. A double vibration isolation bushing for automobiles according to claim 6, characterized in that, There is a gap between the protruding edge (11) and the mass block.

8. The dual vibration isolation bushing for automobiles according to claim 1, characterized in that, The outer periphery of the inner core (4) is regularly provided with four protruding ridges (11), and four internal connecting rubbers (8) are provided on the outer periphery of the inner core (4), which are arranged in an X shape.

9. A double vibration isolation bushing for automobiles according to claim 2, characterized in that, The inner wall of the outer jacket (1) is provided with four bearing surfaces (12) corresponding to the protruding edge (11). The bearing surfaces (12) are either flat or raised curved surfaces. At least one of the bearing surfaces (12) is provided with multiple weight-reducing grooves (13) on the outer wall of the outer jacket (1).

10. A double vibration isolation bushing for automobiles according to claim 9, characterized in that, The outer ring rubber (7) covering the receiving surface (12) has a wavy texture.

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