Secondary vibration isolation suspension assembly and vehicle

Abstract

The utility model discloses a two-stage vibration isolation suspension assembly which comprises a suspension support body, a first-stage vibration isolation lining, a second-stage vibration isolation lining I and a second-stage vibration isolation lining II, the first-stage vibration isolation lining, the second-stage vibration isolation lining I and the second-stage vibration isolation lining II are arranged on the suspension support body, and the second-stage vibration isolation lining I and the second-stage vibration isolation lining II are arranged to be used for being connected with a driving assembly. The first-stage vibration isolation bush is arranged to be used for being connected with an auxiliary frame assembly. According to the two-stage vibration isolation suspension assembly, two-stage vibration isolation is added, and the transmissibility of high-frequency vibration noise of the driving assembly can be effectively reduced. The utility model further discloses a vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles. Specifically, the utility model relates to a secondary vibration isolation mount assembly and a vehicle. Background Art

[0002] Electric vehicles and internal combustion engine vehicles have different power sources. The power of electric vehicles comes from drive motors, while the power of traditional fuel vehicles comes from engines. Traditional fuel engines have NVH problems in operating conditions such as idling, starting and stopping, and accelerating. Drive motors are light in mass, and the excitation amplitude of vibration during operation is small; due to different working principles and no combustion excitation of fuel engines, the vibration and noise are much smaller than those of engines, and the comfort is better. However, since electric vehicles do not have the combustion excitation and noise of engines, some noises that were not previously paid much attention to and were not very obvious become prominent and are concerned by people and difficult to solve. For example, the high-frequency whistling problems of motors and gearboxes.

[0003] Motors have the characteristic of large starting torque, that is, high torque output can be generated at low speeds. The violent torque change during the start of electric vehicles will cause impact problems of the vehicle; to effectively control the impact problem of large torque of electric vehicles, rubber bushing mounts are often used for electric vehicle mounts. The bushing structure has a significant effect on low-frequency vibration, but has a poor vibration isolation effect on high-frequency vibration. Electric vehicle motors and reducers usually generate high-frequency vibration and are accompanied by whistling problems. A single-stage bushing structure cannot achieve effective vibration isolation.

[0004] To address the above problems, some electric vehicles currently start to adopt secondary vibration isolation technology to solve the high-frequency noise problem of electric vehicles, so that the secondary vibration isolation mount in the high-frequency range has a lower transmissibility.

[0005] Increasing a secondary vibration isolation bushing to connect the motor / reducer housing requires a large design space. When restricted by the boundary of the motor assembly, it is very difficult to increase the secondary vibration isolation bushing.

[0006] Chinese Patent with application number 202010399117.7 discloses a secondary vibration isolation mount structure and a vehicle applying the same. The secondary vibration isolation mount structure includes a mount bracket, a first bushing, a second bushing and a shock absorber; the mount bracket includes a first through hole and a second through hole; the first bushing is arranged in the first through hole; the second bushing is arranged in the second through hole; the first bushing is connected to the motor assembly; the second bushing is connected to the subframe; the shock absorber is arranged on the mount bracket.

[0007] It is desired to provide an improved secondary vibration isolation mount assembly, especially regarding how to effectively reduce the transmissibility of high-frequency vibration noise of the drive assembly. Summary of the Utility Model

[0008] The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present utility model provides a secondary vibration isolation mount assembly, aiming to effectively reduce the transmission rate of high-frequency vibration noise of the drive assembly.

[0009] To achieve the above object, the technical solution adopted by the present utility model is as follows: A secondary vibration isolation mount assembly includes a mount bracket body, a primary vibration isolation bushing, a secondary vibration isolation bushing I, and a secondary vibration isolation bushing II disposed on the mount bracket body. The secondary vibration isolation bushing I and the secondary vibration isolation bushing II are configured to be connected to the drive assembly, and the primary vibration isolation bushing is configured to be connected to the subframe assembly.

[0010] Two secondary vibration isolation bushings I are provided.

[0011] One secondary vibration isolation bushing II is provided, and the secondary vibration isolation bushing II is located below the secondary vibration isolation bushing I.

[0012] The primary vibration isolation bushing I includes a primary bushing vulcanized outer skeleton, a primary bushing vulcanized inner skeleton connected to the primary bushing vulcanized outer skeleton, a crash pad, and a primary bushing rubber main spring connected to the primary bushing vulcanized outer skeleton and the primary bushing vulcanized inner skeleton.

[0013] A plurality of oval through-holes for weight reduction are provided on the primary bushing vulcanized inner skeleton.

[0014] The secondary vibration isolation bushing I includes a first vulcanized skeleton and a first vulcanized rubber disposed on the first vulcanized skeleton, and a rubber convex structure is provided on the first vulcanized rubber.

[0015] A plurality of the rubber convex structures are provided.

[0016] The secondary vibration isolation bushing II includes a second vulcanized outer skeleton, a second vulcanized inner skeleton, and a second vulcanized rubber connected to the second vulcanized outer skeleton and the second vulcanized inner skeleton.

[0017] The present utility model also provides a vehicle including the secondary vibration isolation mount assembly.

[0018] For the secondary vibration isolation mount assembly of the present utility model, adding secondary vibration isolation can effectively reduce the transmission rate of high-frequency vibration noise of the drive assembly. Description of the Drawings

[0019] This specification includes the following drawings, and the shown contents are respectively:

[0020] Figure 1 It is a schematic diagram of the assembly relationship of the secondary vibration isolation mount assembly of the present utility model;

[0021] Figure 2 It is a schematic diagram of the secondary vibration isolation mount structure;

[0022] Figure 3 is Figure 2 the A-A cross-sectional view in it;

[0023] Figure 4 is Figure 2 the B-B cross-sectional view in it;

[0024] Figure 5 is the schematic diagram of the primary vibration isolation bushing structure;

[0025] Figure 6 is the schematic diagram of the structure of the mounting bracket body;

[0026] Figure 7 is the schematic diagram of the structure of the secondary vibration isolation bushing I;

[0027] Figure 8 is the schematic diagram of the structure of the secondary vibration isolation bushing II;

[0028] In the figure, the markings are: 1. drive assembly; 2. mounting bolt I; 3. mounting bolt II; 4. secondary vibration isolation mounting assembly; 5. mounting bolt III; 6. subframe assembly; 21. primary vibration isolation bushing; 22. secondary vibration isolation bushing I; 23. mounting bracket body; 24. secondary vibration isolation bushing II; 21-1. anti-collision pad; 21-2. outer skeleton of the primary bushing vulcanization; 21-3. main spring of the primary bushing rubber; 21-4. inner skeleton of the primary bushing vulcanization; 22-1. first vulcanized skeleton; 22-2. first vulcanized rubber; 24-1. second outer vulcanized skeleton; 24-2. second vulcanized rubber; 24-3. second inner vulcanized skeleton. Specific embodiments

[0029] The following is a more detailed description of the specific embodiments of the present invention by referring to the accompanying drawings and describing the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitate its implementation.

[0030] It should be noted that in the following embodiments, the "first" and "second" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order, but are only for the convenience of description.

[0031] As Figures 1 to 8 shown, the present invention provides a secondary vibration isolation mounting assembly, including a mounting bracket body 23 and a primary vibration isolation bushing 21, a secondary vibration isolation bushing I 22 and a secondary vibration isolation bushing II 24 provided on the mounting bracket body 23. The secondary vibration isolation bushing I 22 and the secondary vibration isolation bushing II 24 are arranged to be connected to the drive assembly 1, and the primary vibration isolation bushing 21 is arranged to be connected to the subframe assembly 6. The drive assembly 1 mainly includes a motor and a reducer, and the motor and the reducer are connected as a whole.

[0032] Specifically, the utility model provides a structure of a secondary vibration isolation mount assembly for an electric vehicle, which reduces the transmission rate of the power assembly excitation in the high-frequency range and can solve the problems of small fitting space between the mount and the motor / reducer and interference with the power assembly housing. As Figure 1 shown, the secondary vibration isolation mount assembly is connected to the drive assembly 1 through two mounting bolts I2 and one mounting bolt II3; the secondary vibration isolation mount assembly is connected to the subframe assembly 6 through one mounting bolt III5.

[0033] During the operation of the drive assembly 1, the vibration and noise generated are transmitted to the cab through sound on the one hand; on the other hand, they are transmitted to the cab through the structure, and the transmission path is: drive assembly 1 - secondary vibration isolation mount assembly - subframe - vehicle body cab.

[0034] By setting the secondary vibration isolation bushing II and increasing the length of the inner skeleton, the problems of small size of the installation surface of the transmission housing and interference between the vibration isolation bushing and the reinforcing rib of the transmission housing are solved.

[0035] The excitation of the drive assembly 1 is attenuated through the housing by the secondary vibration isolation bushing - the mount bracket body 23 - the primary vibration isolation bushing 21 is attenuated - the subframe assembly 6. Through experimental verification, adding secondary vibration isolation greatly reduces the transmission rate of the high-frequency excitation of the drive assembly 1.

[0036] As Figures 1 to 4 shown, two secondary vibration isolation bushings I22 are provided, and one secondary vibration isolation bushing II24 is provided. The secondary vibration isolation bushing II24 is located below the secondary vibration isolation bushing I22.

[0037] As Figures 2 to 5As shown in the figure, the primary vibration isolation bushing 21I includes a primary bushing vulcanized outer skeleton 21-2, a primary bushing vulcanized inner skeleton 21-4 connected to the primary bushing vulcanized outer skeleton 21-2, a bumper pad 21-1, and a primary bushing rubber main spring 21-3 fixedly connected to the primary bushing vulcanized outer skeleton 21-2 and the primary bushing vulcanized inner skeleton 21-4. The primary bushing rubber main spring 21-3 is located between the primary bushing vulcanized outer skeleton 21-2 and the primary bushing vulcanized inner skeleton 21-4. The primary bushing vulcanized inner skeleton 21-4 is for the installation bolt to pass through. The primary bushing vulcanized outer skeleton 21-2 is inserted into the first mounting hole on the mount bracket body 23. The bumper pads 21-1 are arranged on opposite sides of the primary bushing rubber main spring 21-3. The bumper pads 21-1 are fixedly connected to the primary bushing vulcanized outer skeleton 21-2 and the primary bushing vulcanized inner skeleton 21-4. The bumper pads 21-1 are also located on opposite sides of the mount bracket body 23. The bumper pads 21-1 are located outside the first mounting hole. The bumper pads 21-1 are in contact with the surface of the mount bracket body 23.. The bumper pads 21-1 are provided with a wavy structure, which can effectively reduce the frictional noise generated during impact.

[0038] The primary bushing vulcanized inner skeleton 21-4 is made of die-cast aluminum. Preferably, the primary bushing vulcanized inner skeleton 21-4 is provided with 4 oval through-hole weight-reducing holes, which on the one hand thin the wall thickness of the die-cast aluminum, reduce the risk of air holes, and improve the strength performance of the skeleton, and on the other hand reduce the weight and cost of the part; the primary bushing rubber main spring 21-3 is designed in an X-shaped structure, which is beneficial to improving the anti-torsion performance of the mount.

[0039] As Figure 6 shown, the mount bracket body 23 is provided with weight-reducing holes and rib structures, which reduce the weight of the product and improve the structural strength of the bracket.

[0040] The secondary vibration isolation bushing I22 is inserted into the second mounting hole on the mount bracket body 23. Two secondary vibration isolation bushings I22 are installed in the second mounting hole. The two secondary vibration isolation bushings I22 are relatively pressed onto the mount bracket body 23. As Figures 2 to 4 and Figure 7As shown in the figure, the secondary vibration isolation bushing I22 includes a first vulcanized skeleton 22-1 and a first vulcanized rubber 22-2 disposed on the first vulcanized skeleton 22-1. The first vulcanized rubber 22-2 is located between the suspension bracket body 23 and the first vulcanized skeleton 22-1, and the first vulcanized skeleton 22-1 is used for the mounting bolt to pass through. A rubber convex structure is provided on the first vulcanized rubber 22-2. There are 15 rubber convex structures, which are arranged on the outer circumferential surface of the first vulcanized rubber 22-2. All the rubber convex structures are evenly distributed circumferentially on the outer circumferential surface of the first vulcanized rubber 22-2. The rubber convex structure and the first vulcanized rubber 22-2 are integrally formed. The rubber convex structure is in contact with the inner circumferential surface of the second mounting hole, and the thickness of the rubber convex structure is relatively thick (the thickness of the rubber convex structure is 4.2 mm). After being press-fitted into the suspension bracket, the contact area between the secondary vibration isolation bushing I22 and the suspension bracket is reduced, and the vibration isolation performance of the bushing is improved.

[0041] The secondary vibration isolation bushing II24 is inserted into the third mounting hole on the suspension bracket body 23, as Figures 2 to 4 and Figure 8 shown. The secondary vibration isolation bushing II24 includes a second vulcanized outer skeleton 24-1, a second vulcanized inner skeleton 24-3, and a second vulcanized rubber 24-2 connected to the second vulcanized outer skeleton 24-1 and the second vulcanized inner skeleton 24-3. The second vulcanized rubber 24-2 is located between the second vulcanized outer skeleton 24-1 and the second vulcanized inner skeleton 24-3. The second vulcanized inner skeleton 24-3 is used for the mounting bolt to pass through, and the second vulcanized outer skeleton 24-1 is inserted into the third mounting hole. The second vulcanized inner skeleton 24-3 adopts an asymmetric design, and the length of the connection end with the reducer housing is elongated, which can avoid the interference problem between the secondary bushing body and the reducer housing. The distance L1 between the first end of the second vulcanized outer skeleton 24-1 and the suspension bracket body 23 is 4 mm, and the distance L2 between the second end of the second vulcanized outer skeleton 24-1 and the suspension bracket body 23 is 24.7 mm. The first end and the second end of the second vulcanized outer skeleton 24-1 are the opposite ends in the axial direction of the second vulcanized outer skeleton 24-1. The end face of the second end of the second vulcanized outer skeleton 24-1 is in contact with the surface of the reducer housing, and the second end of the second vulcanized outer skeleton 24-1 is far from the suspension bracket body 23, so that a gap is formed between the suspension bracket body 23 and the reducer housing.

[0042] The secondary vibration isolation suspension assembly with the above structure has the following advantages:

[0043] 1. By adding two secondary vibration isolation bushings I and the secondary vibration isolation bushing II, the transmission rate of high-frequency vibration noise generated during the operation of the drive assembly 1 is effectively reduced;

[0044] 2. The wave-shaped rubber structure design of the secondary vibration isolation bushing I has strong vibration isolation ability; the secondary vibration isolation bushing II24 effectively solves the problem of interference between the secondary vibration isolation bushing and the transmission housing by increasing the length of the inner skeleton. By using a combination of the two secondary vibration isolation bushings, the vibration isolation performance and engineering feasibility are taken into account.

[0045] The present utility model also provides a vehicle, including the secondary vibration isolation mount assembly with the above structure. The vehicle is an electric vehicle, and this secondary vibration isolation mount assembly can be referred to Figures 1 to 8 , which will not be elaborated here. Since the vehicle of the present utility model includes the secondary vibration isolation mount assembly in the above embodiment, it has all the advantages of the above secondary vibration isolation mount assembly.

[0046] The present utility model has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present utility model; or without improvement, the above concept and technical solution of the present utility model are directly applied to other occasions, they are all within the protection scope of the present utility model.

Claims

1. Secondary vibration isolation mounting assembly, characterized in that: It includes a suspension bracket body, a primary vibration isolation bushing, a secondary vibration isolation bushing I and a secondary vibration isolation bushing II provided on the suspension bracket body. The secondary vibration isolation bushing I and the secondary vibration isolation bushing II are arranged to be connected to the drive assembly, and the primary vibration isolation bushing is arranged to be connected to the subframe assembly.

2. The secondary vibration isolation mount assembly according to claim 1, wherein: Two of the secondary vibration isolation bushings I are provided.

3. The secondary vibration isolation mounting assembly according to claim 1, characterized in that: One of the secondary vibration isolation bushings II is provided, and the secondary vibration isolation bushing II is located below the secondary vibration isolation bushing I.

4. The secondary vibration isolation mount assembly according to any one of claims 1 to 3, characterized in that: The primary vibration isolation bushing I includes a primary bushing vulcanized outer skeleton, a primary bushing vulcanized inner skeleton connected to the primary bushing vulcanized outer skeleton, a collision cushion, and a primary bushing rubber main spring connected to the primary bushing vulcanized outer skeleton and the primary bushing vulcanized inner skeleton.

5. The secondary vibration isolation mount assembly according to claim 4, wherein: A plurality of oval through-holes for weight reduction are provided on the primary bushing vulcanized inner skeleton.

6. The secondary vibration isolation mount assembly according to any one of claims 1 to 3, characterized in that: The secondary vibration isolation bushing I includes a first vulcanized skeleton and a first vulcanized rubber provided on the first vulcanized skeleton, and a rubber convex structure is provided on the first vulcanized rubber.

7. The secondary vibration isolation mounting assembly according to claim 6, wherein: A plurality of the rubber convex structures are provided.

8. The secondary vibration isolation mounting assembly according to any one of claims 1 to 3, characterized in that: The secondary vibration isolation bushing II includes a second vulcanized outer skeleton, a second vulcanized inner skeleton, and a second vulcanized rubber connected to the second vulcanized outer skeleton and the second vulcanized inner skeleton.

9. Vehicle, characterized in that: It includes the secondary vibration isolation mount assembly according to any one of claims 1 to 8.

Images