Two-stage vibration isolation suspension for electric vehicle and vehicle

Abstract

The utility model discloses an electric automobile secondary vibration isolation suspension and a vehicle, the electric automobile secondary vibration isolation suspension comprises a main spring assembly and a bushing assembly which are arranged on a suspension support, and the bushing assembly comprises a first bushing structure, a second bushing structure and a small bushing structure; the first lining structure and the second lining structure are symmetrically arranged and are the same in structure, and the suspension support and a vehicle body longitudinal beam are connected through the first lining structure and the second lining structure. The suspension bracket is connected with the storage battery bracket through a small bushing structure; first-stage vibration isolation is achieved through the main spring assembly at the connecting position of the power assembly and the suspension support, and second-stage vibration isolation is achieved through the lining assembly at the connecting position of the suspension support and a vehicle body. By means of the two stages of vibration isolation devices, the problem of gear box howling or motor howling in a high-frequency band sensitive to human ears can be solved, and vibration transmitted into a vehicle is reduced to the minimum.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile vibration isolation suspension, and in particular relates to a secondary vibration isolation suspension of an electric vehicle and a vehicle. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] The most commonly used vibration isolation mount in existing cars is the primary vibration isolation mount. There are two main types. One is the rubber vibration isolation mount, which is also the most commonly used vibration isolation mount. The commonly used rubber vibration isolator has poor impact resistance at low frequencies and cannot effectively cope with the demand for increased vibration and impact resistance brought about by the increasing engine power and the trend of lightweight cars. The other is the hydraulic vibration isolation mount. This hydraulic vibration isolator has strong impact resistance, but poor vibration isolation ability at high frequencies, and cannot effectively cope with the high-frequency noise problem currently highlighted by electric vehicles.

[0004] In order to solve the problem of high-frequency noise, especially the whistling sound caused by gear meshing of the gearbox or motor excitation of new energy, some electric vehicles have begun to adopt two-stage vibration isolation technology. For example, Chinese invention patent CN110103694A discloses a two-stage vibration isolation hydraulic mount, which uses a two-stage vibration isolation composed of hydraulic vibration isolation and rubber vibration isolation. This mount is used for rear motor suspension. Since the front cabin suspension has high space requirements, this mount cannot be applied to the front cabin suspension. In addition, the two-stage vibration isolation component of the suspension is redesigned based on the main spring component of the rubber suspension, resulting in a complex suspension structure, a long cycle, and inconvenience for platformization. Utility Model Content

[0005] The purpose of the utility model is to provide an electric vehicle secondary vibration isolation mount and vehicle, which can effectively improve the gearbox or motor howling problem in the high-frequency band, and can also meet the fatigue strength requirements of the battery bracket arranged on the suspension bracket.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] In the first aspect, an embodiment of the utility model provides a secondary vibration isolation suspension for an electric vehicle, comprising a main spring assembly and a bushing assembly arranged on a suspension bracket, wherein the bushing assembly comprises a first bushing structure, a second bushing structure and a small bushing structure; the first bushing structure and the second bushing structure are symmetrically arranged and have the same structure, and the suspension bracket and the vehicle body longitudinal beam are connected by the first bushing structure and the second bushing structure; the suspension bracket and the battery bracket are connected by the small bushing structure.

[0008] As a further technical solution, the suspension bracket is connected to the powertrain side through a main spring assembly to form a primary hydraulic vibration isolation suspension; the suspension bracket is connected to the vehicle body and battery bracket through a bushing assembly to form a secondary bushing vibration isolation suspension.

[0009] As a further technical solution, the first bushing structure includes a bushing inner core, a bushing rubber and a bushing outer tube which are sequentially sleeved from the inside to the outside; the first bushing structure is placed in the mounting hole of the suspension bracket, and bolts pass through the interior of the first bushing structure to connect the suspension bracket and the vehicle body longitudinal beam.

[0010] As a further technical solution, the bushing inner core, bushing rubber and bushing outer tube are all cylindrical structures, and the bolt passes through the interior of the bushing inner core.

[0011] As a further technical solution, both ends of the first bushing structure are provided with limit pads and limit plates.

[0012] As a further technical solution, the bushing inner core, bushing rubber and bushing outer tube are interference fit.

[0013] As a further technical solution, the small bushing structure includes a small bushing inner core, a small bushing rubber and a small bushing outer tube which are sequentially arranged from the inside to the outside. The small bushing inner core, the small bushing rubber and the small bushing outer tube all adopt a cylindrical structure. The bolts pass through the interior of the small bushing inner core to connect the suspension bracket and the connecting bracket.

[0014] As a further technical solution, the connecting bracket is provided with bolt holes, and the battery bracket and the connecting bracket are mounted on the vehicle body reinforcement beam by bolts.

[0015] As a further technical solution, the small bushing inner core, the small bushing rubber and the small bushing outer tube are interference fit.

[0016] In a second aspect, an embodiment of the present utility model provides a vehicle, comprising the secondary vibration isolation mount for an electric vehicle as described in the first aspect.

[0017] The beneficial effects of the above-mentioned embodiments of the utility model are as follows:

[0018] The utility model provides a two-stage vibration isolation suspension, in which the first-stage vibration isolation is achieved by a main spring assembly at the connection position between the powertrain and the suspension bracket, and the second-stage vibration isolation is achieved by a bushing assembly at the connection position between the suspension bracket and the vehicle body; through the above two-stage vibration isolation device, the problem of gearbox howling or motor howling in the high-frequency band that the human ear is sensitive to can be solved, so that the vibration transmitted to the vehicle is minimized.

[0019] The secondary vibration isolation suspension provided by the utility model connects the suspension bracket to the battery bracket and fixes them by bolts at the secondary vibration isolation position of the suspension bracket. This design can not only improve the impact resistance of the car in the low frequency band, but also effectively improve the gearbox or motor howling problem in the high frequency band, and at the same time meet the fatigue strength requirements of the battery bracket arranged on the suspension bracket.

[0020] The secondary vibration isolation suspension provided by the utility model adopts the existing structure for the main spring assembly, and only needs to adopt a bushing structure at the connection position between the suspension bracket and the vehicle body to realize it. Compared with the existing secondary vibration isolation suspension, there is no need to redesign the main spring assembly, and the partial modification of the vehicle model on the same platform is simple, which has the advantages of low cost, short cycle and good performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a schematic diagram of the connection and assembly of the secondary vibration isolation suspension of the utility model;

[0023] Figure 2 It is a schematic diagram of the overall structure of the secondary vibration isolation suspension of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the suspension bracket and bushing assembly of the utility model;

[0025] Figure 4 It is a schematic diagram of the structure decomposition of the suspension bracket and the first bushing of the utility model;

[0026] Figure 5 It is a schematic diagram of the structure decomposition of the suspension bracket and the small bushing of the utility model;

[0027] Figure 6 It is an exploded schematic diagram of the suspension bracket, battery bracket and small bushing structure of the utility model;

[0028] Figure 7 This is a schematic diagram of the suspension bracket, battery bracket and small bushing structure of the utility model after assembly Figure 1 ;

[0029] Figure 8 It is a schematic diagram of the suspension bracket, battery bracket and small bushing structure of the utility model after assembly;

[0030] Fig. 9 It is a cross-sectional schematic diagram of the small bushing structure of the utility model;

[0031] Fig.10The figure is a noise comparison diagram of a real vehicle with and without the second-level vibration isolation mount of the utility model installed.

[0032] The schematic diagram is for illustrative purposes only;

[0033] Among them, 1. suspension bracket; 2. battery bracket; 21. first connection point; 22. second connection point; 23. third connection point; 3. main spring assembly; 4. bushing assembly; 41. first bushing structure; 411. limit plate; 412. limit pad; 413. bushing inner core; 414. bushing rubber; 415. bushing outer tube; 42. small bushing structure; 421. small bushing inner core; 422. small bushing rubber; 423. small bushing outer tube; 43. second bushing structure; 5. connecting bracket; 6. vehicle body reinforcement beam. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] Example 1

[0036] In a typical implementation of the present invention, Figure 1-3 As shown, a secondary vibration isolation suspension for an electric vehicle is provided, comprising a main spring assembly 3 and a bushing assembly 4 arranged on a suspension bracket 1, wherein the bushing assembly 4 comprises a first bushing structure 41, a second bushing structure 43 and a small bushing structure 42; the first bushing structure 41 and the second bushing structure 43 are symmetrically arranged and have the same structure, and the suspension bracket 1 is connected to the vehicle body longitudinal beam through the first bushing structure 41 and the second bushing structure 43; the suspension bracket 1 is connected to the battery bracket 2 through the small bushing structure 42.

[0037] In this embodiment, the main spring assembly 3 adopts the existing structure and is installed inside the suspension bracket 1. The electric vehicle secondary vibration isolation suspension provided in this embodiment, the suspension bracket 1 is connected to the powertrain side through the main spring assembly 3 to form a primary hydraulic vibration isolation suspension; the suspension bracket 1 is connected to the vehicle body and battery bracket through the bushing assembly 4 to form a secondary bushing vibration isolation suspension.

[0038] like Figure 4 As shown, the first bushing structure 41 includes a bushing inner core 413, a bushing rubber 414 and a bushing outer tube 415 which are sequentially sleeved from the inside to the outside; the first bushing structure 41 is placed in the mounting hole of the suspension bracket 1, and bolts pass through the interior of the first bushing structure 41 to connect the suspension bracket 1 and the vehicle body longitudinal beam.

[0039] Furthermore, the bushing inner core 413 , the bushing rubber 414 and the bushing outer tube 415 are all cylindrical structures, and the bolt passes through the inside of the bushing inner core 413 .

[0040] Furthermore, both ends of the first bushing structure 41 are provided with a limiting pad 413 and a limiting sheet 411 .

[0041] In this embodiment, the limiting plate 441 is made by stamping, the limiting pad 442 and the second point bushing rubber 444 are made by vulcanization process, the second point bushing inner core 443 is made by cold drawing process, and the second point bushing outer tube 445 is injection molded. The above structures are combined to form the first bushing structure 41.

[0042] Furthermore, the bushing inner core 413 , the bushing rubber 414 and the bushing outer tube 415 are interference fit.

[0043] In this embodiment, the second bushing structure 43 has the same structure as the first bushing structure 41 , which will not be described in detail herein.

[0044] The first bushing structure 41 and the second bushing structure 43 are respectively installed in the installation holes on the left and right sides of the suspension bracket 1. The suspension bracket 1 is fixedly installed on the longitudinal beam of the vehicle body by bolts passing through the first bushing structure 41 and the second bushing structure 43 respectively.

[0045] like Figure 5 As shown, the small bushing structure 42 includes a small bushing inner core 421, a small bushing rubber 422 and a small bushing outer tube 423 which are sequentially sleeved from the inside to the outside. The small bushing inner core 421, the small bushing rubber 422 and the small bushing outer tube 423 all adopt a cylindrical structure. Bolts pass through the interior of the small bushing inner core to connect the suspension bracket 1 and the connecting bracket 5.

[0046] In this embodiment, the small bushing inner core 421, the small bushing rubber 422 and the small bushing outer tube 423 are interference fit. The small bushing inner core 421 is made by cold drawing process, the small bushing rubber 422 is made by vulcanization process, and the small bushing outer tube 443 is injection molded.

[0047] Furthermore, the connecting bracket 5 is provided with bolt holes, and the battery bracket 2 and the connecting bracket 5 are mounted on the vehicle body reinforcement beam 6 by bolts.

[0048] In this embodiment, the battery bracket 2 is a "X"-shaped structure, the suspension bracket 1 is located in the battery bracket 2, the battery is installed above the battery bracket 2, and the battery bracket 2 is provided with a first connection point 21, a second connection point 22 and a third connection point 23, such as Figure 6 and Fig. 9As shown, the first connection point 21 and the third connection point 23 are used to install the battery bracket on the longitudinal beam of the vehicle body by screws; the second connection point 22 is connected to the connecting bracket 5 and the vehicle body by bolts, and the installed battery bracket and suspension bracket are as shown in Figure 7 and Figure 8 shown.

[0049] The electric vehicle secondary vibration isolation suspension provided in this embodiment has the engine vibration transmitted to the hydraulic vibration isolation part of the main spring assembly through the suspension bracket, and the hydraulic vibration isolation is used to buffer the low-frequency large-amplitude or high-frequency small-amplitude vibration, thereby providing primary vibration isolation; the residual vibration after the primary vibration isolation can be further attenuated under the vibration-damping effect of the bushing assemblies on both sides, so that the vibration transmitted to the vehicle is minimized.

[0050] At the same time, the suspension bracket and the battery bracket are connected through a small bushing, which can maintain the vibration isolation between the suspension bracket and the vehicle body while ensuring the fatigue and strength of the battery.

[0051] The noise comparison diagram of the secondary vibration isolation mount of the electric vehicle provided in this embodiment obtained by the actual vehicle noise test is as follows: Fig.10 As shown, from Fig.10 It can be seen that after adopting the electric vehicle secondary vibration isolation suspension solution of this embodiment, the human ear noise response at different vehicle speeds is improved, and the gearbox howling noise inside the vehicle is significantly improved.

[0052] Example 2

[0053] In a typical implementation of the utility model, a vehicle is provided, comprising the secondary vibration isolation mount for an electric vehicle as described in Example 1.

[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A secondary vibration isolation mount for an electric vehicle, characterized in that: It includes a main spring assembly and a bushing assembly arranged on a suspension bracket, wherein the bushing assembly includes a first bushing structure, a second bushing structure and a small bushing structure; the first bushing structure and the second bushing structure are symmetrically arranged and have the same structure, and the suspension bracket and the vehicle body longitudinal beam are connected via the first bushing structure and the second bushing structure; the suspension bracket and the battery bracket are connected via the small bushing structure.

2. The electric vehicle secondary vibration isolation mount according to claim 1, characterized in that: The suspension bracket is connected to the powertrain side through the main spring assembly to form a primary hydraulic vibration isolation suspension; the suspension bracket is connected to the vehicle body and battery bracket through the bushing assembly to form a secondary bushing vibration isolation suspension.

3. The electric vehicle secondary vibration isolation mount according to claim 1, characterized in that: The first bushing structure includes a bushing inner core, a bushing rubber and a bushing outer tube which are sequentially sleeved from the inside to the outside; the first bushing structure is placed in the mounting hole of the suspension bracket, and bolts pass through the interior of the first bushing structure to connect the suspension bracket and the vehicle body longitudinal beam.

4. The electric vehicle secondary vibration isolation mount according to claim 3, characterized in that: The bushing inner core, bushing rubber and bushing outer tube are all cylindrical structures, and the bolt passes through the inside of the bushing inner core.

5. The electric vehicle secondary vibration isolation mount according to claim 3, characterized in that: Limiting pads and limiting plates are provided at both ends of the first bushing structure.

6. The electric vehicle secondary vibration isolation mount according to claim 3, characterized in that: The bushing inner core, bushing rubber and bushing outer tube are interference fit.

7. The electric vehicle secondary vibration isolation mount according to claim 1, characterized in that: The small bushing structure includes a small bushing inner core, a small bushing rubber and a small bushing outer tube which are sequentially sleeved from the inside to the outside. The small bushing inner core, the small bushing rubber and the small bushing outer tube all adopt a cylindrical structure. Bolts pass through the interior of the small bushing inner core to connect the suspension bracket and the connecting bracket.

8. The electric vehicle secondary vibration isolation mount according to claim 7, characterized in that: The connecting bracket is provided with bolt holes, and the battery bracket and the connecting bracket are installed on the vehicle body reinforcement beam by bolts.

9. The electric vehicle secondary vibration isolation mount according to claim 7, characterized in that: The small bushing inner core, the small bushing rubber and the small bushing outer tube are interference fit.

10. A vehicle, characterized in that: It comprises the secondary vibration isolation mount for an electric vehicle as described in any one of claims 1 to 9.

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