Suspension bushing, auxiliary frame assembly and motor vehicle
By using a split-type suspension bushing and replacing the suspension bracket with an internal skeleton limiting part, the problems of complex suspension bushing structure and the inability to balance NVH performance and durability are solved, achieving the effects of structural simplification, weight reduction and reduced whistling.
Patent Information
- Application Number
- CN202423324308.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing suspension bushings have complex structures, are heavy, and have low modal frequencies. They are prone to coupling with the meshing frequency of reducer gears, which can cause whistling and affect the user experience. Furthermore, NVH performance and durability cannot be balanced.
The suspension bushing adopts a split design, including a first elastic element and a second elastic element, which isolate vibration and noise through radial and axial deformation respectively. Combined with the limiting part of the inner skeleton, it replaces the suspension bracket and reduces the number of parts.
The structure was simplified, the weight was reduced, the modal frequency was increased, the risk of howling was reduced, and the NVH performance and durability were balanced.
Smart Images
Figure CN223644609U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor vehicle technology, and in particular to a suspension bushing, a subframe assembly, and a motor vehicle. Background Technology
[0002] Motor vehicles, such as automobiles, are generally equipped with powertrain mounting bushings (or simply mounting bushings). Powertrain mounting bushings are important components of automobiles, installed between the subframe and the powertrain. They isolate powertrain vibrations and noise from being transmitted to the subframe, improving ride comfort and protecting automotive components. Specifically, the industry generally summarizes the main function of mounting bushings as improving the vehicle's noise, vibration, and harshness (NVH) performance.
[0003] To improve NVH performance, it is necessary to minimize the number of components in the suspension bushing while maintaining isolation performance. Utility Model Content
[0004] In view of this, this application provides a suspension bushing, a subframe assembly, and a motor vehicle to solve at least one problem existing in the prior art.
[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:
[0006] In a first aspect, embodiments of this application provide a suspension bushing applied to a motor vehicle, the motor vehicle including a subframe, a power unit, and the suspension bushing, the suspension bushing being installed between the power unit and the subframe; the suspension bushing includes:
[0007] The first elastic element has a first through hole;
[0008] An outer sheath is fitted around the outer periphery of the first elastic element, and the inner wall of the outer sheath abuts against the outer peripheral wall of the first elastic element.
[0009] The inner frame includes an inner core that passes through the first through hole and a limiting portion that restricts the first elastic member; the limiting portion is connected to the inner core and protrudes outward in the circumferential direction of the inner core to block the first elastic member in the axial direction of the first through hole.
[0010] Optionally, the suspension bushing further includes a second elastic element, which is sleeved on the outer sheath and protrudes axially from the end face of the outer sheath near the power component in the first through hole; the projection of the second elastic element in the axial direction of the first through hole at least partially falls into the projection of the limiting portion in the axial direction of the first through hole.
[0011] Optionally, the second elastic member has a plurality of elastic protrusions protruding axially along the first through hole on its outer end face.
[0012] Optionally, the radial projection shape of the elastic protrusion in the first through hole is trapezoidal.
[0013] Optionally, the stiffness coefficient of the second elastic element is greater than that of the first elastic element.
[0014] Optionally, the stiffness coefficient of the second elastic element is 400 N / mm-600 N / mm; the stiffness coefficient of the first elastic element is 240 N / mm-360 N / mm.
[0015] Optionally, the suspension bushing further includes a mounting bracket, which is sleeved on the outer sheath and axially connected to the second elastic element in the first through hole; the mounting bracket has a screw hole seat with a screw hole protruding on its periphery; the screw hole seat has the screw hole for connection to the subframe by screw.
[0016] Optionally, the limiting part includes an inner side and an outer edge, the inner side is connected to the inner core, and the outer edge, in the axial projection of the first through hole, covers the second elastic element; the limiting part is provided with a plurality of weight-reducing second through holes.
[0017] Secondly, embodiments of this application provide a subframe assembly, including:
[0018] The subframe includes a closed frame formed by at least one crossbeam and at least one longitudinal beam;
[0019] A frame bushing is mounted on the crossbeam and / or the longitudinal beam, wherein the crossbeam and / or the longitudinal beam has a first mounting hole for accommodating the frame bushing;
[0020] Any of the suspension bushings described above is press-fitted onto the crossbeam and / or the longitudinal beam, and the crossbeam and / or the longitudinal beam has a second mounting hole for accommodating the suspension bushing; the fit between the suspension bushing and the second mounting hole is an interference fit or a transition fit.
[0021] Thirdly, embodiments of this application provide a motor vehicle, including:
[0022] The subframe, the power unit, and the aforementioned suspension bushing, wherein the suspension bushing is installed between the power unit and the subframe;
[0023] Alternatively, the subframe assembly and power unit described above, wherein the power unit is connected to the subframe via the suspension bushing.
[0024] The suspension bushing, subframe assembly, and motor vehicle provided in this application embodiment include: a first elastic member extending axially along a first through hole and having a first through hole whose axis is the same as the axial direction of the first through hole; an outer sheath fitted around the outer periphery of the first elastic member, the inner wall of the outer sheath abutting against the outer peripheral wall of the first elastic member; and an inner frame including an inner core passing through the first through hole and a limiting portion restricting the axial position of the first elastic member in the first through hole; the limiting portion extends radially outward along the first through hole to partially cover the end face of the first elastic member near the power component; the radial direction of the first through hole is the radial direction of the first through hole. It can be seen that the suspension bushing, subframe assembly, and motor vehicle of this application embodiment add a limiting portion to the inner frame to restrict the axial position of the first elastic member. The limiting portion can replace the limitation of the first elastic member's axial position by the suspension bracket, so that the suspension bushing does not need to be equipped with a suspension bracket, reducing the number of parts. Therefore, the suspension bushing, subframe assembly, and motor vehicle of this application embodiment can reduce the number of parts.
[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0027] Figure 1 A schematic diagram of the suspension bushing provided in an embodiment of this application;
[0028] Figure 2 A cross-sectional schematic diagram of the suspension bushing provided in the embodiments of this application;
[0029] Figure 3 An exploded view (dissolved diagram) of the suspension bushing provided in an embodiment of this application;
[0030] Figure 4 A schematic diagram of the suspension bushing after the inner skeleton has been removed, as provided in an embodiment of this application.
[0031] Figure 5 A schematic diagram showing the first elastic element and the outer sheath of the suspension bushing provided in the embodiments of this application installed together;
[0032] Figure 6 A schematic diagram of the subframe assembly provided in an embodiment of this application;
[0033] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.
[0034] Explanation of reference numerals in the attached figures:
[0035] 10. Subframe; 11. Crossbeam; 12. Longitudinal beam; 20. Suspension bushing; 21. First elastic element; 211. First through hole; 212. Circular tube; 213. Spoke; 22. Outer sheath; 221. Blind hole; 222. First protrusion; 23. Inner frame; 231. Inner core; 232. Limiting part; 2321. Second through hole; 233. Third through hole; 24. Second elastic element; 241. Elastic protrusion; 25. Mounting bracket; 251. Screw hole; 30. Frame bushing. Detailed Implementation
[0036] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.
[0037] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.
[0038] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.
[0039] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0040] In this application, unless otherwise expressly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.
[0041] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.
[0042] During the research and development process, the applicant discovered that existing suspension bushings also include a bracket connecting the powertrain. This bracket serves two purposes: connecting the suspension bushing and the powertrain, and also axially restricting the position of the main spring. Therefore, it is structurally complex, heavy, and has a low modal frequency, which couples with the gear meshing frequency of the reducer, generating a whistling sound and affecting the user experience. Therefore, the applicant aims to eliminate this bracket through research and development and integrate its function into other components.
[0043] Therefore, based on further research and development by the applicant, the following technical solution was proposed.
[0044] This application provides a suspension bushing 20 applied to a motor vehicle. The motor vehicle includes a subframe 10, a power unit (not shown in the figures), and the suspension bushing 20, which is mounted between the power unit and the subframe 10. (See reference...) Figures 1-3 The suspension bushing 20 includes:
[0045] The first elastic element 21 has a first through hole 211;
[0046] An outer sheath 22 is fitted around the outer periphery of the first elastic member 21, and the inner wall of the outer sheath 22 abuts against the outer peripheral wall of the first elastic member 21.
[0047] The inner frame 23 includes an inner core 231 that passes through the first through hole 211 and a limiting part 232 that restricts the first elastic member 21; the limiting part 232 is connected to the inner core 231 and protrudes outward in the circumferential direction of the inner core 231 to block the first elastic member 21 in the axial direction of the first through hole 211.
[0048] Understandably, the power unit refers to the powertrain. This embodiment is mainly used for electric motor vehicles, and the power unit can be an electric motor. It is also understood that in other types of motor vehicles, the power unit can be an engine, such as a gasoline engine or a diesel engine.
[0049] Understandably, the first elastic element 21 can be the main spring of the suspension bushing 20. That is, it mainly isolates the vibration and noise transmitted from the power components to the subframe 10 through radial deformation. The axial direction of the first through hole 211 is marked as D1 in the figure, and the radial direction of the first through hole 211 is marked as D2 in the figure.
[0050] Specifically, the first elastic element 21 can be made of rubber material. In this way, the first elastic element 21 has good elasticity.
[0051] Specifically, refer to Figure 4 and Figure 5 The first elastic element 21 can be a circular tube 212 with radially protruding spokes 213 added to it. This provides a large deformation space in the radial direction, resulting in a large buffering capacity. More specifically, the spokes 213 can be cross-shaped, consisting of four spokes 213 that intersect perpendicularly in the radial direction. This results in a simple structure and low manufacturing cost.
[0052] The outer sheath 22 is mainly used to fix the first elastic element 21 and protect the first elastic element 21. Furthermore, when installing the subframe 10, the outer peripheral surface of the outer sheath 22 is the mating surface for installation.
[0053] Specifically, the inner wall of the outer sheath 22 abuts against the end wall of the spoke 213.
[0054] Specifically, the outer sheath 22 can be made of nylon material. Compared to metal materials, the outer sheath 22 also has a certain degree of elasticity.
[0055] Furthermore, the inner wall of the outer sheath 22 is provided with a first protrusion 222 and filled between adjacent spokes 213. This increases the overall strength of the outer sheath 22, and when the first elastic member 21 deforms, the outer wall of the circular tube 212 can also be restricted during deformation, thus increasing the buffering capacity.
[0056] Furthermore, the outer sheath 22 may have multiple blind holes 221 on the outer wall corresponding to the first protrusion 222 to increase the deformation capacity of the outer periphery of the outer sheath 22, which is beneficial for the installation of the suspension bushing 20 onto the subframe 10.
[0057] The inner frame 23 mainly serves to support the suspension bushing 20 and connect the power unit and the subframe 10.
[0058] Specifically, the inner frame 23 can be made of cast aluminum. This provides sufficient strength for a more stable connection between the power unit and the subframe 10.
[0059] The limiting portion 232 extends radially outward along the first through hole 211 to cover the portion of the end face of the first elastic member 21 near the power component. Thus, when the first elastic member 21 moves axially, a portion of its end face will abut against the limiting portion 232 and be restricted. Therefore, the limiting portion 232 serves to restrict the axial position of the first elastic member 21.
[0060] Understandably, covering only the portion of the first elastic member 21 near the end face of the power component can both block the first elastic member 21 and reduce the weight of the inner frame 23.
[0061] Specifically, the inner frame 23 may have a third through hole through which bolts can pass to fix the positions of the power unit and the subframe 10 relative to each other.
[0062] In this embodiment of the application, the suspension bushing 20 has a limiting part 232 added to the inner frame 23 to limit the axial position of the first elastic member 21. The limiting part 232 can replace the limitation of the suspension bracket on the axial position of the first elastic member 21, so that the suspension bushing 20 does not need to be equipped with a suspension bracket, thus reducing the number of parts.
[0063] In some other embodiments of this application, the suspension bushing 20 further includes a second elastic member 24, which is sleeved on the outer sheath 22 and protrudes axially from the end face of the outer sheath 22 near the power component in the first through hole 211; the projection of the second elastic member 24 in the axial direction of the first through hole 211 at least partially falls into the projection of the limiting portion 232 in the axial direction of the first through hole 211.
[0064] That is, the projection of the second elastic member 24 on the axial direction of the first through hole 211 coincides with the projection of the limiting part 232 on the axial direction of the first through hole 211. In this way, the axial movement generated by the inner frame 23 under the vibration of the power component can drive the limiting part 232 to axially impact the end face of the first elastic member 21, and the second elastic member 24 is disposed here. Therefore, the impact force can be reduced by elasticity, that is, NVH can be reduced.
[0065] Understandably, in Figure 2 In the middle, the power component is on the left side, and the end face of the outer sheath 22 near the power component is... Figure 2 The middle part is the left end face of the outer sheath 22.
[0066] In some other embodiments of this application, the second elastic member 24 is provided with a plurality of elastic protrusions 241 protruding axially along the first through hole 211 on its outer end face.
[0067] This creates a two-stage buffer, further increasing the buffering performance and making it more effective in reducing NVH (noise, vibration, and harshness). The first stage is the elastic protrusion 241, and the second stage is the end face of the second elastic element 24 excluding the elastic protrusion 241.
[0068] Specifically, see Figure 2 The elastic protrusion 241 is closer to the power component. The vibration of the power component first acts on the elastic protrusion 241 and then compresses the elastic protrusion 241. That is, the elastic protrusion 241 buffers the vibration transmitted by the power component, which is the first-level buffer. At the same time, the vibration is further transmitted to the end face of the second elastic member 24 other than the elastic protrusion 241. The end face of the second elastic member 24 other than the elastic protrusion 241 also buffers the vibration transmitted by the power component through elastic compression, which is the second buffer. Therefore, two-level buffers are formed in time.
[0069] In some other embodiments of this application, the radial projection shape of the elastic protrusion 241 in the first through hole 211 is trapezoidal.
[0070] The trapezoidal elastic protrusion 241 makes the structure more stable and provides better cushioning performance.
[0071] In some other embodiments of this application, the stiffness coefficient of the second elastic element 24 is greater than the stiffness coefficient of the first elastic element 21.
[0072] The applicant of this application discovered during the research and development that in the prior art, the end-face limiting structure spring and the main spring are an integral vulcanized structure with the same stiffness. A low-stiffness main spring is beneficial for improving NVH (noise, vibration, and harshness), that is, the lower the stiffness of the main spring, the better. However, a low-stiffness end-face limiting structure spring is more prone to fatigue wear, leading to a decrease in durability. Therefore, the prior art has a technical problem that NVH performance and durability performance cannot be simultaneously achieved.
[0073] Therefore, the applicant of this application creatively proposed a split design, dividing the main spring and the end-face limiting structure spring into two components, namely the first elastic element 21 and the second elastic element 24 in this embodiment. The first elastic element 21 mainly isolates the vibration and noise transmitted from the power component to the subframe 10 through radial deformation. The second elastic element 24 mainly isolates the vibration and noise transmitted from the power component to the subframe 10 through axial deformation. Based on the stiffness requirements of both, the stiffness of each is designed so that the stiffness coefficient of the second elastic element 24 is greater than that of the first elastic element 21. This solves the technical problem of the inability to simultaneously achieve NVH performance and durability.
[0074] In some other embodiments of this application, the stiffness coefficient of the second elastic member 24 is 400N / mm-600N / mm; and the stiffness coefficient of the first elastic member 21 is 240N / mm-360N / mm.
[0075] This design is based on the material properties and processing conditions of rubber, which solves the technical problem of simultaneously achieving good NVH performance and durability. It also prevents the manufacturing process from becoming overly complex and keeps manufacturing costs within an acceptable range.
[0076] In some other embodiments of this application, the suspension bushing 20 further includes a mounting bracket 25, which is sleeved on the outer sheath 22 and axially connected to the second elastic member 24 in the first through hole 211; the mounting bracket 25 has a screw hole seat with screw holes protruding on its periphery; the screw hole seat has screw holes 251 for connecting to the subframe 10 by screws.
[0077] Understandably, the suspension bushing 20 can be press-fitted onto the subframe 10, which has press-fit holes (i.e., the second mounting hole described below). This makes the installation more stable. The mounting bracket 25 is further secured with screws on top of the press-fit, making the position of the suspension bushing 20 even more stable.
[0078] In some other embodiments of this application, the limiting part 232 includes an inner side and an outer edge, the inner side is connected to the inner core 231, and the outer edge covers the second elastic member 24 in the axial projection of the first through hole 211; the limiting part 232 is provided with a plurality of weight-reducing second through holes 2321.
[0079] Specifically, the shape of the orthographic projection of the limiting part 232 on the axial direction of the first through hole 211 can be a circle, a semicircle, a fan shape, etc., which makes it easier to process. It can be understood that it can also be other shapes that can limit the axial position of the first elastic member, such as a rectangle, a triangle, etc.
[0080] More specifically, the limiting part 232 is fan-shaped, with its inner sharp corners rounded to form an arc. Connected to the inner core 231, it restricts the axial position of the first elastic element 21. The outer edge covers the second elastic element 24, allowing the limiting part to transmit power from the power component to the second elastic element, thus enabling the second elastic element 24 to act as a buffer. Compared to circles and semicircles, the fan shape reduces the weight of the inner frame, decreases the moment of inertia of the suspension bushing, and increases the modal frequency of the suspension bushing 20. Furthermore, the cross-section of the fan shape gradually increases from the inside out, resulting in better overall mechanical performance.
[0081] Similarly, the second through hole 2321 can reduce the weight of the inner skeleton 23 and increase the modal frequency of the suspension bushing 20.
[0082] This application also provides a subframe assembly, see reference. Figure 6 and Figure 7 The subframe assembly includes:
[0083] The subframe 10 includes a closed frame formed by at least one crossbeam 11 and at least one longitudinal beam 12;
[0084] The frame bushing 30 is installed on the crossbeam 11 and / or the longitudinal beam 12, and the crossbeam 11 and / or the longitudinal beam 12 are provided with a third through hole 233 and a first mounting hole for accommodating the frame bushing 30.
[0085] The suspension bushing 20 described above is press-fitted onto the crossbeam 11 and / or the longitudinal beam 12. The crossbeam 11 and / or the longitudinal beam 12 are provided with a second mounting hole for accommodating the suspension bushing 20. The fit between the suspension bushing 20 and the second mounting hole is an interference fit or a transition fit.
[0086] Specifically, there are two crossbeams 11 and two longitudinal beams 12, which form an irregular quadrilateral that is roughly rectangular, thus forming the frame of the subframe 10.
[0087] Specifically, there are four frame bushings 30, which are installed at the four corners of the quadrilateral, namely at the junction of the crossbeam 11 and the longitudinal beam 12.
[0088] Specifically, there are four suspension bushings 20, two of which are installed on the crossbeam 11 on one side, and the other two are installed on the longitudinal beams 12 on both sides connected to the crossbeam 11.
[0089] Specifically, the suspension bushings 20 are all disposed on the inner side of the crossbeam 11 or the longitudinal beam 12. That is, the axis of the first through hole 211 of the suspension bushing 20 is parallel to the virtual plane formed by the frame of the subframe 10.
[0090] In this embodiment of the subframe assembly, a limiting part 232 is added to the inner frame 23 to restrict the axial position of the first elastic member 21. The limiting part 232 can replace the suspension bracket in restricting the axial position of the first elastic member 21, so that the suspension bushing 20 does not need to be equipped with a suspension bracket, thus reducing the number of parts.
[0091] To better understand the subframe assembly of the embodiments of this application, the assembly process of the subframe assembly is briefly described below.
[0092] First, the outer sheath 22 is fitted onto the first elastic element 21, and then the inner core of the inner skeleton 23 is inserted into the first through hole 211 of the first elastic element until the limiting part abuts against the circular tube of the first elastic element 21; the first elastic element 21, the outer sheath 22 and the inner skeleton 23 assembled together are all fixed to each other by vulcanization process.
[0093] The second step is to vulcanize and fix the second elastic element 24 and the mounting bracket 25 together, and then fix them to the subframe with screws.
[0094] The third step is to press the assembled first elastic element 21, outer sheath 22 and inner skeleton 23 into the second mounting hole of the subframe to complete the process of installing the suspension bushing 20 into the subframe.
[0095] This application also provides a motor vehicle, including:
[0096] The subframe 10, the power unit, and the aforementioned suspension bushing 20 are mounted between the power unit and the subframe 10.
[0097] Alternatively, the subframe assembly and power unit described above, wherein the power unit is connected to the subframe 10 via the suspension bushing 20.
[0098] In this embodiment of the motor vehicle, a limiting part 232 is added to the inner frame 23 to limit the axial position of the first elastic member 21. The limiting part 232 can replace the suspension bracket in limiting the axial position of the first elastic member 21, so that the suspension bushing 20 does not need to be equipped with a suspension bracket, thus reducing the number of parts.
[0099] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations contained in this application. Various modifications and changes can be made to the above embodiments without departing from the scope of this application. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of this application and do not limit the scope of protection of this patent application.
Claims
1. A suspension bushing, applied to a motor vehicle, the motor vehicle including a subframe, a power unit, and the suspension bushing, the suspension bushing being installed between the power unit and the subframe; characterized in that, The suspension bushing includes: The first elastic element has a first through hole; An outer sheath is fitted around the outer periphery of the first elastic element, and the inner wall of the outer sheath abuts against the outer peripheral wall of the first elastic element. The inner frame includes an inner core that passes through the first through hole and a limiting portion that restricts the first elastic member; the limiting portion is connected to the inner core and protrudes outward in the circumferential direction of the inner core to block the first elastic member in the axial direction of the first through hole.
2. The suspension bushing according to claim 1, characterized in that, The suspension bushing further includes a second elastic element, which is sleeved on the outer sheath and protrudes axially from the end face of the outer sheath near the power component in the first through hole; the projection of the second elastic element in the axial direction of the first through hole at least partially falls into the projection of the limiting portion in the axial direction of the first through hole.
3. The suspension bushing according to claim 2, characterized in that, The second elastic element has a plurality of elastic protrusions on its outer end face that protrude axially along the first through hole.
4. The suspension bushing according to claim 3, characterized in that, The radial projection of the elastic protrusion onto the first through hole is trapezoidal.
5. The suspension bushing according to claim 2, characterized in that, The stiffness coefficient of the second elastic element is greater than that of the first elastic element.
6. The suspension bushing according to claim 5, characterized in that, The stiffness coefficient of the second elastic element is 400 N / mm-600 N / mm; the stiffness coefficient of the first elastic element is 240 N / mm-360 N / mm.
7. The suspension bushing according to claim 2, characterized in that, The suspension bushing also includes a mounting bracket, which is sleeved on the outer sheath and is axially connected to the second elastic element in the first through hole; the mounting bracket has a screw hole seat with screw holes protruding on its periphery; the screw hole seat has screw holes for connection to the subframe by screws.
8. The suspension bushing according to claim 2, characterized in that, The limiting part includes an inner side and an outer edge. The inner side is connected to the inner core, and the outer edge covers the second elastic element in the axial projection of the first through hole. The limiting part is provided with a plurality of weight-reducing second through holes.
9. A subframe assembly, characterized in that, include: The subframe includes a closed frame formed by at least one crossbeam and at least one longitudinal beam; A frame bushing is mounted on the crossbeam and / or the longitudinal beam, wherein the crossbeam and / or the longitudinal beam has a first mounting hole for accommodating the frame bushing; The suspension bushing according to any one of claims 1-8 is press-fitted onto the crossbeam and / or the longitudinal beam, wherein the crossbeam and / or the longitudinal beam has a second mounting hole for accommodating the suspension bushing; the fit between the suspension bushing and the second mounting hole is an interference fit or a transition fit.
10. A motor vehicle, characterized in that, include: The subframe, the power unit, and the suspension bushing according to any one of claims 1-8, wherein the suspension bushing is installed between the power unit and the subframe; Alternatively, the subframe assembly and power unit of claim 9, wherein the power unit is connected to the subframe via the suspension bushing.