Bushing for electric vehicle powertrain suspension and suspension system

Abstract

Bushing for an electric vehicle powertrain suspension, comprising a mandrel (1), an outer sleeve (2) and a rubber main spring (3) connected between the mandrel (1) and the outer sleeve (2), characterized in that the rubber main spring (3) comprises a plurality of main body parts (31) spaced apart around the outer contour of the mandrel (1), wherein an extension part (32) is provided on at least one side of the main body parts (31), and an end surface (4) of the extension part (32) and an end surface (4) of the main body parts (31) form a stepped structure, characterized in that the rubber main spring (3) further comprises an inner connecting ring (33) and an outer connecting ring (34), and the main body parts (31) are connected between the inner connecting ring (33) and the outer connecting ring (34).

Description

Field of invention

[0001] The present invention relates to an electric vehicle, in particular to a bushing for an electric vehicle powertrain suspension and a suspension system. State of the art

[0002] Compared to conventional fuel-powered vehicles, the motor torque of pure electric vehicles can quickly exceed 1,000 Nm in a very short time. Due to the high rotational speed, the motor's excitation frequency to the suspension system can also reach several kilohertz. Existing drivetrain suspension bushings, whether rubber or hydraulic, struggle to overcome the limitations of dynamic high-frequency hardening. At higher frequencies, the dynamic stiffness of the suspension increases significantly. This leads to a sharp decrease in the vibration isolation capability of the suspension bushing, or even its complete loss. With the gradual popularization of electric vehicles, the demand for high-frequency vibration isolation of electric vehicle motor drivetrains has become increasingly apparent.To solve the problem of high-frequency vibration isolation, the current main technical approaches are as follows: 1) Adding a vibration-absorbing layer to the main rubber spring significantly reduces the high-frequency dynamic stiffness of the bushing in the 800-3000 Hz frequency band and improves the vibration isolation performance of the entire bushing, but there is a risk that the additional vibration-absorbing layer will introduce high-frequency noise; 2) The short support arm and low weight of the suspension structure in the suspension system achieve the effect of making the suspension structure highly modal and less prone to resonance, thereby improving the NVH performance of the entire vehicle, but not every suspension point of any suspension system can provide suitable conditions to realize the ideal suspension structure.

[0003] The GB 2 010 438 A reveals a pre-tensionable, elastic bushing.

[0004] DE 10 2011 005 616 A1 discloses a drive device for driving a wheel for an electrically powered vehicle. Object of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and to provide a bushing for an electric vehicle powertrain suspension with a simple and compact structure that is easy to manufacture, has a low dynamic high-frequency stiffness and can avoid the risk of high-frequency noise.

[0006] The present invention further provides a suspension system comprising the bushing described above.

[0007] To solve the aforementioned technical problems, the present invention uses the following technical solutions: A bushing for an electric vehicle powertrain suspension comprises a mandrel, an outer sleeve and a rubber main spring connected between the mandrel and the outer sleeve, the rubber main spring comprising a plurality of main body parts spaced apart around the outer contour of the mandrel, an extension part being provided on at least one side of the main body parts, and an end face of the extension part and an end face of the main body parts forming a stepped structure.

[0008] According to the invention, the main rubber spring further comprises an inner connecting ring and an outer connecting ring, and the main body parts are connected between the inner connecting ring and the outer connecting ring.

[0009] As a further improvement to the above technical solution: The extension part is connected to the inner connecting ring, or the extension part is connected to the outer connecting ring, or both the inner connecting ring and the outer connecting ring are connected to the extension part.

[0010] As a further improvement to the above technical solution: The main body part of the mandrel is circular, and several of the main body parts are arranged evenly along the circumferential direction of the mandrel.

[0011] As a further improvement to the above technical solution: The mandrel and the outer sleeve are connected by vulcanization of the rubber main spring.

[0012] As a further improvement to the above technical solution: The axis of the mandrel coincides with or is parallel to the axis of the outer sleeve.

[0013] An electric vehicle powertrain suspension system includes the aforementioned electric vehicle powertrain suspension bushing.

[0014] The advantages of the present invention over the prior art are: In the bushing for an electric vehicle powertrain suspension disclosed by the present invention, the rubber main spring comprises a plurality of main body parts spaced apart around the outer contour of the mandrel. An extension part is provided on the side of the main body part of the rubber main spring, forming a stepped structure with the main body part. It is easy to process and manufacture. Tests show that this structure can reduce the high-frequency dynamic stiffness of the bushing and improve the high-frequency vibration isolation performance of the bushing. Compared to the additional vibration-absorbing layer in the prior art, the present invention exhibits better stability because the extension part extends from the rubber main body part and essentially avoids the risk of generating high-frequency noise.And the extension part is located in the gap between the two adjacent main body parts, the volume of the rubber main spring is not increased, the structure is compact and it is convenient to attach it to the suspension points of various suspension systems.

[0015] The electric vehicle powertrain suspension system disclosed in the present invention includes the bushing mentioned above and thus also has the advantages mentioned above. Brief description of the drawings Fig. Figure 1 is a schematic structure diagram of a disassembled state of a bushing for an electric vehicle powertrain suspension of the present invention. Fig. Figure 2 is a schematic structure diagram of an assembled state of a bushing for an electric vehicle powertrain suspension of the present invention. Fig. Figure 3 is an axial cross-sectional view of a bushing for an electric vehicle powertrain suspension of the present invention. Fig. Figure 4 is an enlarged partial view of a bushing for an electric vehicle powertrain suspension of the present invention. Fig. Figure 5 is a schematic structure diagram of a further embodiment of a bushing for an electric vehicle powertrain suspension of the present invention. Fig. Figure 6 is a schematic diagram of a dynamic stiffness curve of a bushing for an electric vehicle powertrain suspension of the present invention. Description of preferred embodiments

[0016] The present invention is described in further detail below with reference to the attached drawings and specific embodiments.

[0017] Fig. Figures 1 to 4 show an embodiment of a bushing for an electric vehicle powertrain suspension according to the present invention. The bushing for an electric vehicle powertrain suspension of the present embodiment comprises a mandrel 1, an outer sleeve 2, and a rubber main spring 3 connected between the mandrel 1 and the outer sleeve 2, wherein the rubber main spring 3 comprises a plurality of main body parts 31 spaced apart around the outer contour of the mandrel 1, wherein an extension part 32 is provided on at least one side of the main body parts 31, and the end surface 4 of the extension part 32 and the end surface 4 of the main body parts 31 form a stepped structure; in other words, along the axial direction of the mandrel 1, the length of the extension part 32 is shorter than that of the main body parts 31; in other words, the extension part 32 is located between the two end surfaces 4 of the main body parts 31.The axis of the mandrel 1 coincides with or is parallel to the axis of the outer sleeve 2, or the two can be arranged coaxially or eccentrically.

[0018] In the bushing for an electric vehicle powertrain suspension, the rubber main spring 3 comprises a plurality of main body parts 31 spaced apart around the outer contour of the mandrel 1, wherein an extension part 32 is provided on at least one side of the main body parts 31 of the rubber main spring 3, which forms a stepped structure with the main body parts 31, making it easier to process and manufacture. With reference to the Fig. 6. Tests show that, compared to the existing bushing, this structure can reduce the high-frequency dynamic stiffness of the bushing and improve its high-frequency vibration isolation performance. Compared to the additional vibration-absorbing layer in the prior art, the present invention exhibits better stability because the extension part 32 extends from the main rubber body part 31, and essentially avoids the risk of generating high-frequency noise. Furthermore, the extension part 32 is located in the gap between the two adjacent main body parts 31; the volume of the main rubber spring 3 is not increased, the structure is compact, and it is convenient to attach it to the suspension points of various suspension systems.

[0019] Furthermore, in this embodiment, the main rubber spring 3 comprises an inner connecting ring 33 and an outer connecting ring 34, and the main body parts 31 are connected between the inner connecting ring 33 and the outer connecting ring 34. The respective main body parts 31 can be connected to form a single unit by the inner connecting ring 33 and the outer connecting ring 34. As a preferred technical solution, the multiple main body parts 31 are arranged uniformly along the circumferential direction of the mandrel 1 if the main body parts of the mandrel 1 are circular, thereby ensuring that the properties of the main rubber spring 3 are uniform in the circumferential direction.

[0020] In this embodiment, the preferred technical solution is that both the inner connecting ring 33 and the outer connecting ring 34 are connected to the extension part 32, so that the dynamic properties of the main rubber spring 3 are stable. Referring to Fig. 5 Of course, in other embodiments, the extension part 32 can also be connected only to the inner connecting ring 33, or the extension part 32 can be connected only to the outer connecting ring 34.

[0021] As a preferred technical solution, the mandrel 1 and the outer sleeve 2 are connected by vulcanization of the rubber main spring 3.

[0022] An electric vehicle powertrain suspension system of the present embodiment comprises the above-mentioned bushing for an electric vehicle powertrain suspension.

[0023] The electric vehicle powertrain suspension system includes the aforementioned bushing and therefore also has the advantages of the aforementioned bushing.

[0024] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or to modify the technical content disclosed above to equivalent embodiments with equivalent variations, without departing from the scope of the technical solution of the present invention. Therefore, all simple modifications, equivalent changes, and variations made to the above embodiments in accordance with the technical essence of the present invention, without departing from the content of the technical solutions of the present invention, should fall within the scope of protection of the technical solutions of the present invention. Reference symbol list

[0025] 1. Mandrel; 2. Outer sleeve; 3. Rubber main spring; 31. Main body part; 32. Extension part; 33. Inner connecting ring; 34. Outer connecting ring; 4. End surface.

Claims

[1] Bushing for an electric vehicle powertrain suspension, comprising a mandrel (1), an outer sleeve (2) and a rubber main spring (3) connected between the mandrel (1) and the outer sleeve (2), characterized by , that the rubber main spring (3) comprises a plurality of main body parts (31) spaced apart around the outer contour of the mandrel (1), wherein an extension part (32) is provided on at least one side of the main body parts (31), and an end surface (4) of the extension part (32) and an end surface (4) of the main body parts (31) form a stepped structure, characterized by , that the rubber main spring (3) further comprises an inner connecting ring (33) and an outer connecting ring (34), and the main body parts (31) are connected between the inner connecting ring (33) and the outer connecting ring (34). [2] Bushing for an electric vehicle powertrain suspension according to claim 1, characterized by, that the extension part (32) is connected to the inner connecting ring (33) or the extension part (32) is connected to the outer connecting ring (34) or both the inner connecting ring (33) and the outer connecting ring (34) are connected to the extension part (32). [3] Bushing for an electric vehicle powertrain suspension according to claim 1, characterized by , that the main body part of the mandrel (1) is circular, and several of the main body parts (31) are arranged uniformly along the circumferential direction of the mandrel (1). [4] Bushing for an electric vehicle powertrain suspension according to one of claims 1 to 3, characterized by , that the mandrel (1) and the outer sleeve (2) are connected by vulcanization of the rubber main spring (3). [5] Bushing for an electric vehicle powertrain suspension according to one of claims 1 to 3, characterized by, that an axis of the mandrel (1) coincides with or is parallel to the outer sleeve (2). [6] Electric vehicle powertrain suspension system, characterized by , that it comprises the bushing for an electric vehicle powertrain suspension according to any one of claims 1 to 5.

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