Vibration isolation pad
By setting a skeleton inside the elastic body of the vibration isolation pad and adjusting its natural frequency, the problem of the small adjustable range of the existing vibration isolation pad is solved, better vibration isolation and noise reduction are achieved, and the comfort of the whole vehicle is improved.
Patent Information
- Application Number
- CN202421410092.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The natural frequency adjustment range of existing vibration isolation pads is small, making it difficult to avoid the excitation frequency in commonly used frequency bands, resulting in resonance, vibration and noise problems.
By setting a skeleton inside the elastic body of the vibration isolation pad, the natural frequency of the vibration isolation pad is adjusted using the skeleton of different natural frequencies, thereby increasing the adjustable range of the natural frequencies and avoiding the excitation frequency.
It effectively avoids resonance, reduces vibration and noise, improves the comfort of the whole vehicle, and improves the overall stiffness of the vibration isolation pad through the high stiffness of the skeleton.
Smart Images
Figure CN222863954U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of automobile shock absorption, and in particular to a vibration isolation pad. Background Art
[0002] Vibration isolation pads are important suspension system parts that are related to vehicle comfort and NVH (Noise, Vibration, Harshness). Most existing vibration isolation pads are made of rubber only. The natural frequency of pure rubber structure is low, and the adjustable range of natural frequency is small, so it is not easy to avoid the excitation frequency in the commonly used frequency band. Utility Model Content
[0003] The present application provides a vibration isolation pad, which is used to solve the problem that the natural frequency of the existing vibration isolation pad has a small adjustable range.
[0004] An embodiment of the present application provides a vibration isolation pad, which includes an elastomer and a skeleton, wherein the elastomer wraps the skeleton, and the skeleton is used to adjust the natural frequency of the vibration isolation pad.
[0005] In one possible design, the elastomer has a first surface extending along the radial direction of the vibration isolation pad, and the skeleton includes a first part and a second part, the first part extends along the radial direction of the vibration isolation pad, and the second part extends toward the first surface along the axial direction of the vibration isolation pad.
[0006] In a possible design, the distance between the first surface and the first portion varies along the circumference of the vibration isolation pad.
[0007] In a possible design, the elastic body further has a second surface opposite to the first surface, and the distance between the second surface and the first part does not change along the circumference of the vibration isolation pad.
[0008] In a possible design, the length of the second portion varies along the circumference of the vibration isolation pad.
[0009] In a possible design, the elastic body has a second surface, a groove is provided on the second surface, and the second surface can abut against the sub-frame so that the groove is closed by the sub-frame.
[0010] In a possible design, a plurality of the grooves are arranged along the circumference of the vibration isolation pad.
[0011] In a possible design, a connecting groove is further provided on the second surface, and adjacent grooves are connected through the connecting groove.
[0012] In a possible design, the elastic body has a first surface extending in a radial direction of the vibration isolation pad, and a mounting groove is provided on the first surface, and the mounting groove is used to install a suspension spring.
[0013] In a possible design, the elastic body further has a protruding limiting portion, and the limiting portion is used to limit the suspension spring from falling off from the mounting groove.
[0014] In the present application, a skeleton is provided inside the elastomer. By selecting skeletons with different natural frequencies, the natural frequency of the vibration isolation pad can be changed, thereby increasing the adjustable range of the natural frequency of the vibration isolation pad, and then being able to avoid the excitation frequency of the commonly used frequency band, prevent resonance, effectively reduce vibration, reduce noise inside the vehicle, and improve the comfort of the whole vehicle. At the same time, the stiffness of the elastomer is poor, and the stiffness of the skeleton is good. Therefore, setting a skeleton inside the elastomer can improve the overall stiffness of the vibration isolation pad, thereby reducing the degree of deformation of the suspension spring compressing the vibration isolation pad when there is a slight vibration from the outside, and improving the comfort of the whole vehicle.
[0015] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic structural diagram of a vibration isolation pad provided in the present application in a specific embodiment;
[0017] Figure 2 for Figure 1 sectional view of
[0018] Figure 3 for Figure 2 Schematic diagram of the structure of the mesoskeleton;
[0019] Figure 4 for Figure 1 Bottom view of
[0020] Figure 5 for Figure 1 Cross-sectional view of the center isolation pad and subframe.
[0021] Reference numerals:
[0022] 1-Elastomer;
[0023] 11- first surface;
[0024] 12- second surface;
[0025] 13- groove;
[0026] 14-connection slot;
[0027] 15-Mounting slot;
[0028] 16-limiting part;
[0029] 17-Avoidance slot;
[0030] 2- Skeleton;
[0031] 21-Part I;
[0032] 22-Part II;
[0033] 3- Subframe.
[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION
[0035] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0036] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0037] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.
[0038] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0039] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.
[0040] The vehicle suspension system is used to provide movable support between the vehicle body and the wheels to ensure driving safety and comfort. The vehicle suspension system includes suspension springs and vibration isolation pads. The suspension springs are used to achieve elastic connection between the suspension system and the subframe 3, bear and transmit vertical loads, and mitigate and suppress impacts caused by uneven roads. The vibration isolation pads are arranged between the suspension springs and the subframe 3 to buffer the rigid impact between the suspension springs and the subframe 3.
[0041] Existing vibration isolation pads are generally made of pure rubber, so the vibration isolation pads have the problem of a small adjustable range of natural frequency and cannot avoid the excitation frequency of the commonly used frequency band.
[0042] The present application embodiment provides a vibration isolation pad, such as Figure 1 and Figure 2 As shown, the vibration isolation pad includes: an elastic body 1 and a skeleton 2, the elastic body 1 wraps the skeleton 2, and the skeleton 2 is used to adjust the natural frequency of the vibration isolation pad.
[0043] In this embodiment, if Figure 1 and Figure 2 As shown, a skeleton 2 is arranged inside the elastomer 1. By selecting skeletons 2 with different natural frequencies, the natural frequency of the vibration isolation pad can be changed, thereby increasing the adjustable range of the natural frequency of the vibration isolation pad, and then avoiding the excitation frequency of the commonly used frequency band, preventing resonance, effectively reducing vibration, reducing the noise inside the vehicle, and improving the comfort of the entire vehicle.
[0044] Specifically, the elastomer 1 can be made of a material with lower stiffness, so that it can absorb the energy of impact and low-frequency vibration through deformation, thereby improving the low-frequency vibration isolation rate of the vibration isolation pad; the frame 2 can be made of a material with higher stiffness, so that it can better resist high-frequency vibration and improve the comfort of the entire vehicle.
[0045] By combining the elastic body 1 with lower stiffness and the frame 2 with higher stiffness, the natural frequency of the vibration isolation pad can be easily adjusted to avoid the excitation frequency of the commonly used frequency band and prevent resonance. It can be understood that the selection of the natural frequency of the vibration isolation pad can be adjusted accordingly according to the different needs of different models.
[0046] The material of the elastic body 1 can be rubber, etc., and the material of the skeleton 2 can be steel, aluminum alloy, plastic, etc. The skeleton 2 can be manufactured by stamping, casting, injection molding, etc.
[0047] In addition, the vibration isolation pad and the frame can also form a multi-level vibration isolation effect.
[0048] In a specific embodiment, Figure 1 and Figure 2As shown, the elastic body 1 has a first surface 11 and a second surface 12, the first surface 11 and the second surface 12 are arranged opposite to each other, and both extend along the radial direction of the vibration isolation pad. Figure 2 and Figure 3 As shown, the skeleton 2 includes a first portion 21 and a second portion 22 , wherein the first portion 21 extends along the radial direction of the vibration isolation pad, and the second portion 22 extends toward the first surface 11 along the axial direction of the vibration isolation pad.
[0049] In this embodiment, if Figure 2 and Figure 3 As shown, since the first portion 21 extends along the radial direction of the vibration isolation pad, the first portion 21 can provide support to the elastomer 1 along the axial direction of the vibration isolation pad, improve the normal stiffness of the vibration isolation pad, and thereby improve the ability of the vibration isolation pad to resist impact and vibration; since the second portion 22 extends toward the first surface 11 along the axial direction of the vibration isolation pad, the second portion can provide support to the elastomer 1 along the radial direction of the vibration isolation pad, provide radial stiffness of the vibration isolation pad, thereby maintaining the overall shape of the vibration isolation pad when the vibration isolation pad is compressed.
[0050] Optional, such as Figure 2 As shown, the distance between the first surface 11 and the first part 21 changes along the circumference of the vibration isolation pad, and the distance between the second surface 12 and the first part 21 does not change along the circumference of the vibration isolation pad, that is, the vibration isolation pad is set as a structure with lift.
[0051] When the suspension spring is subjected to a force in its axial direction, the deformation of the suspension spring at the starting position is greater than the deformation at other positions in the circumferential direction of the suspension spring, so that the distance between the first surface 11 and the first part 21 changes along the circumference of the vibration isolation pad, and the starting end of the suspension spring is set at a position where the distance between the first surface 11 and the first part 21 is smaller, which can make the overall deformation of the suspension spring more uniform, thereby improving the shock absorption stability. The distance between the second surface 12 and the first part 21 does not change along the circumference of the vibration isolation pad, so that when the vibration isolation pad is subjected to a force in its axial direction, the deformation degree of the elastic body 1 located on the side of the skeleton 2 close to the second surface 12 is more uniform, thereby making the vibration isolation effect of the vibration isolation pad better.
[0052] At the same time, since the distance between the first surface 11 and the first part 21 changes along the circumference of the vibration isolation pad, and the distance between the second surface 12 and the first part 21 does not change along the circumference of the vibration isolation pad, the height of the vibration isolation pad also changes along the circumference of the vibration isolation pad. The height change of the vibration isolation pad along the circumference is adapted to the height change of the suspension spring along the circumference, thereby making the contact between the suspension spring and the vibration isolation pad closer.
[0053] Optionally, the distance between the first surface 11 and the first part 21 does not change along the circumference of the vibration isolation pad, and the length of the second part 22 does not change along the circumference of the vibration isolation pad, that is, the vibration isolation pad is set as a structure without lift, so that the stiffness and shock absorption effect at different positions of the vibration isolation pad are close, and the vibration isolation pad has the advantages of simple structure and easy production.
[0054] It can be understood that by setting the vibration isolation pad as a structure with or without lift, and adjusting the height change rate of the lift, the normal stiffness of the vibration isolation pad can be changed and the natural frequency of the vibration isolation pad can be adjusted, thereby further increasing the adjustable range of the natural frequency of the vibration isolation pad, thereby avoiding the excitation frequency of the commonly used frequency band, preventing resonance, effectively reducing vibration, reducing noise inside the vehicle, and improving the comfort of the entire vehicle.
[0055] Specifically, Figure 1 and Figure 2 As shown, a mounting groove 15 is provided on the first surface 11 , and the suspension spring is mounted in the mounting groove 15 , so that the vibration isolation pad can be reliably connected to the suspension spring.
[0056] The elastic body 1 further has a protruding limiting portion 16 , which can abut against the suspension spring, thereby limiting the movement of the suspension spring relative to the mounting groove 15 , thereby effectively preventing the suspension spring from falling off from the mounting groove 15 .
[0057] Optionally, a plurality of limiting portions 16 may be provided along the circumference of the mounting groove 15 , thereby improving the limiting reliability of the limiting portions 16 on the suspension spring.
[0058] More specifically, a plurality of avoidance grooves 17 are provided on the first surface 11, and the operator can extend the disassembly tool between the suspension spring and the first surface 11 through the avoidance grooves 17, and then apply force to the suspension spring through the tool, thereby facilitating the removal of the suspension spring from the mounting groove 15 and preventing damage to the elastomer 1 during the disassembly process.
[0059] Furthermore, when the vibration isolation pad is set to a structure with a lift, the second part 22 can be correspondingly set to a structure with a lift, that is, the length of the second part 22 varies along the circumference of the vibration isolation pad, so as to adapt to the height change of the suspension spring along the circumference, so that the contact between the suspension spring and the mounting groove 15 is more fitting and reliable, thereby preventing the suspension spring from being offset relative to the vibration isolation pad.
[0060] It is understandable that the second part 22 may also be configured as a structure without lift.
[0061] By setting the second part 22 as a structure with or without lift, and adjusting the height change rate of the lift, the normal stiffness of the vibration isolation pad can be changed and the natural frequency of the vibration isolation pad can be adjusted, thereby once again increasing the adjustable range of the natural frequency of the vibration isolation pad, thereby avoiding the excitation frequency of the commonly used frequency band, preventing resonance, effectively reducing vibration, reducing noise inside the vehicle, and improving the comfort of the entire vehicle.
[0062] In a specific embodiment, Figure 4 and Figure 5 As shown, a groove 13 is provided on the second surface 12 , and the second surface 12 can abut against the sub-frame 3 so that the groove 13 is closed by the sub-frame 3 .
[0063] In this embodiment, if Figure 4 and Figure 5 As shown, since the groove 13 is closed by the subframe 3, the air between the groove 13 and the subframe 3 can provide damping, thereby reducing the amplitude of passive vibration when subjected to external impact, absorbing impact and vibration energy, and further improving the vibration isolation and buffering effects of the vibration isolation pad.
[0064] At the same time, since the viscosity of air changes little with temperature, it also has the advantage of relatively stable performance.
[0065] It can be understood that by changing the structure, size and arrangement of the groove 13, the weight, stiffness and damping of the vibration isolation pad can be adjusted, thereby achieving better vibration isolation and shock absorption effects of the vibration isolation pad.
[0066] Optionally, the shape of the groove 13 is honeycomb-shaped, and the honeycomb-shaped groove 13 can accommodate more air, so that the vibration isolation pad provides greater damping. In addition, the groove 13 can also be other shapes, which is not limited by the present application.
[0067] Optional, such as Figure 4 As shown, a plurality of grooves 13 are arranged along the circumference of the vibration isolation pad, and the plurality of grooves 13 can be arranged evenly or unevenly along the circumference of the vibration isolation pad. The sizes and shapes of the plurality of grooves 13 can be the same or different.
[0068] Optionally, a connecting groove 14 is further provided on the second surface 12 , and adjacent grooves 13 are connected via the connecting groove 14 , thereby improving the air flow between the groove 13 and the sub-frame 3 , thereby improving the buffering effect.
[0069] Optionally, the groove 13 is provided along the circumference of the vibration isolation pad in a full circle or any number of circles.
[0070] In some other embodiments, the structure of the elastic body 1 can be designed according to the stiffness requirements of the vibration isolation pad, and the material selection of the elastic body 1 can be adjusted according to the dynamic and static stiffness and loss angle. The structure of the frame 2 can be independently designed according to the natural frequency required by the vibration isolation pad or transfer function.
[0071] In some other embodiments, the weight, stiffness and damping of the vibration isolation pad can be adjusted by changing the structure and material of the skeleton 2, thereby improving the vibration isolation rate of the vibration isolation pad. The weight, stiffness and damping of the vibration isolation pad can also be adjusted by changing the structure and material of the elastomer 1, thereby improving the vibration isolation rate of the vibration isolation pad.
[0072] In the present application, by setting a skeleton 2 with different natural frequencies inside the elastomer 1, the adjustable range of the natural frequency of the vibration isolation pad is increased, so as to avoid the excitation frequency of the commonly used frequency band and prevent resonance, thereby effectively reducing vibration, reducing the noise inside the vehicle, and improving the comfort of the entire vehicle.
[0073] At the same time, by providing the groove 13 on the second surface 12, a closed cavity is formed between the second surface 12 and the sub-frame 3, and the air in the cavity can further play a buffering role, thereby improving the vibration isolation and buffering effects of the vibration isolation pad.
[0074] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A vibration isolation pad, characterized in that: The vibration isolation pad comprises: an elastic body (1) and a frame (2), wherein the elastic body (1) wraps the frame (2), and the frame (2) is used to adjust the natural frequency of the vibration isolation pad; The elastic body (1) has a first surface (11) extending in the radial direction of the vibration isolation pad, and the skeleton (2) comprises a first part (21) and a second part (22), the first part (21) extending in the radial direction of the vibration isolation pad, and the second part (22) extending in the axial direction of the vibration isolation pad towards the first surface (11); The length of the second portion (22) varies along the circumference of the vibration isolation pad.
2. The vibration isolation pad according to claim 1, characterized in that: The distance between the first surface (11) and the first portion (21) varies along the circumference of the vibration isolation pad.
3. The vibration isolation pad according to claim 1, characterized in that: The elastic body (1) further comprises a second surface (12) opposite to the first surface (11), and the distance between the second surface (12) and the first part (21) does not change along the circumferential direction of the vibration isolation pad.
4. The vibration isolation pad according to claim 1, characterized in that: The elastic body (1) has a second surface (12), a groove (13) is provided on the second surface (12), and the second surface (12) can abut against the sub-frame (3) so that the groove (13) is closed by the sub-frame (3).
5. The vibration isolation pad according to claim 4, characterized in that: A plurality of grooves (13) are arranged along the circumference of the vibration isolation pad.
6. The vibration isolation pad according to claim 5, characterized in that: The second surface (12) is also provided with a connecting groove (14), and adjacent grooves (13) are connected via the connecting groove (14).
7. The vibration isolation pad according to any one of claims 1 to 6, characterized in that: A mounting groove (15) is provided on the first surface (11), and the mounting groove (15) is used for mounting a suspension spring.
8. The vibration isolation pad according to claim 7, characterized in that: The elastic body (1) further comprises a protruding limiting portion (16), wherein the limiting portion (16) is used to limit the suspension spring from falling off from the mounting groove (15).