KR-20260064537-A - REDUCER COVER FOR DRIVE MOTOR OF ELECTRIC VEHICLE

Abstract

The present invention relates to a cover mounted on a reduction gear of an electric vehicle. The cover comprises a plate-shaped cover body and a cover fastening portion for fastening and securing the cover body to the reduction gear. The cover body is provided with a plurality of area cover portions partitioned along the plate surface to correspond to different facing portions of the reduction gear, and each area cover portion is configured to have different area response characteristics regarding sound absorption or vibration absorption.

Inventors

• 이동화
• 안도규
• 오승민

Assignees

• (주)유피티

Dates

Publication Date

20260507

Application Date

20251021

Priority Date

20241030

Claims (5)

1. In a cover for an electric vehicle reduction gear, A plate-shaped cover body comprising a plurality of area cover portions arranged in a plurality of areas partitioned along a plate surface, each covering different facing portions of the reduction gear and having area response characteristics regarding sound absorption or vibration absorption that are set differently according to the vibration characteristics transmitted from each facing portion; and A cover fastening part provided at least at one position of the cover body part to fasten and fix the cover body part to the reduction gear; A cover for an electric vehicle reduction gear including
2. In paragraph 1, The above region response characteristic includes at least one characteristic among surface impedance, transmission loss, and loss factor, Cover for electric vehicle reduction gear.
3. In paragraph 1, Each of the above area covers is, A plurality of micro-holes formed horizontally through the plate surface along the plate surface; and A rim portion provided in an annular shape around the circumference of each of the above micropores, having an elastic deformation material and configured to undergo elastic displacement according to the vibration characteristics; Includes, At least one of the diameter of the micropore and the thickness of the rim portion is provided to be different from each other. Cover for electric vehicle reduction gear.
4. In paragraph 1, Each of the above area covers is, A plurality of partition ribs arranged along the above plate surface; and A cover film covering the plurality of partition ribs to form a plurality of cavity cells between the plurality of partition ribs; Includes, At least one of the size of the above cavity cell, the shape of the above cavity cell, and the thickness of the above partition rib is provided to be different from each other. Cover for electric vehicle reduction gear.
5. In paragraph 1, Each of the above area covers is, Two or more fiber-reinforced resin layers formed along the above-mentioned plate surface and being a composite material of fiber and resin; and A shear deformation layer interposed between the two or more fiber-reinforced resin layers and shear-deformed by vibration transmitted from the reduction gear to convert vibration energy into thermal energy; Includes, At least one of the thickness or composition of the fiber-reinforced resin layer and the shear deformation layer is provided to be different from each other. Cover for electric vehicle reduction gear.

Description

Reducer Cover for Drive Motor of Electric Vehicle The present invention relates to a cover for a reduction gear included in the drivetrain of an electric vehicle, and more specifically, to a noise and vibration-reducing cover technology for reducing vibration and noise generated and transmitted from the reduction gear. Since electric vehicles produce almost no internal combustion engine noise, high-frequency components originating from drive motors, reduction gears, gear meshing vibrations, and bearings are perceived as the primary sources of noise and vibration. These components are radiated through the reduction gear housing into structural and air transmission paths, directly affecting the Noise, Vibration, and Harshness (NVH) quality of the vehicle cabin. Accordingly, the application of covers capable of ensuring performance under lightweight and thin conditions is being widely considered. Conventionally, single-material covers of a fixed thickness or homogeneous laminated covers were primarily used; however, when the same characteristics were applied to the gearbox face area, where frequency bands and vibration mode distributions differ by location, there was a problem of performance being under- or over-designed in specific bands. Furthermore, it is difficult to arbitrarily increase the mass or volume of the cover due to external constraints such as thermal management, maintainability, and securing rigidity of the fastening parts. From the perspective of design and verification, an approach to managing performance by setting quantitative indicators such as surface impedance, transmission loss, and loss factor as targets is required; however, there have been issues where long-term performance degrades or the design intent is not maintained due to contamination (oil mist, dust), changes in fastening conditions, and thermal expansion under actual vehicle conditions. Therefore, there is a need for a cover technology that allows for design and evaluation using quantitative indicators while considering differences in vibration characteristics by location, and possesses excellent resistance to manufacturing, fastening, and environmental variations. FIG. 1 is a perspective view of a cover for an electric vehicle reduction gear according to an embodiment of the present invention. FIG. 2 illustrates a configuration in which a cover for an electric vehicle reduction gear according to an embodiment of the present invention has a cover body and a cover fastening part arranged to correspond to the first and second reduction gear regions of the reduction gear. FIG. 3 illustrates a configuration in which a cover for an electric vehicle reduction gear according to an embodiment of the present invention includes a surface opening array portion. FIG. 4 illustrates a configuration in which a cover for an electric vehicle reduction gear according to an embodiment of the present invention includes a common grid portion. FIG. 5 illustrates the configuration of a composite laminated portion of a cover for an electric vehicle reduction gear according to an embodiment of the present invention. Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. FIG. 1 shows the appearance of a cover (1000) for a reduction gear of an electric vehicle according to the present embodiment. The cover (1000) covers at least one area of the reduction gear and performs sound absorption and vibration absorption functions for vibrations transmitted from the reduction gear. FIG. 2 shows a schematic structure in which a cover (1000) covers a reduction gear (100). The structure shown in FIG. 2 is a simplified representation of its shape for convenience to explain an embodiment of the present invention concisely and clearly, and the principle described in FIG. 2 can be applied not only to the cover (1000) of FIG. 1 but also to various types of reduction gear covers having various shapes. As illustrated in FIGS. 2 and 3, the plate-face-facing area of the reduction gear (100) includes a first reduction gear area (110) and a second reduction gear area (120). Corresponding to each of these, the cover (1000) includes a plate-shaped cover body portion in which a plurality of areas are partitioned along the plate surface. The cover body portion includes area cover portions (1100, 1200) provided in each partitioned area and having different area response characteristics. Specifically, the first area cover portion (1100) is positioned facing the first reduction gear area (110), and the second area cover portion (1200) is positioned facing the second reduction gear area (120). A cover fastening portion (1300) is formed at at least one position of the cover body portion so that the cover body portion is fastened and fixed to the reduction gear (100) by means of a screw (200), etc. The configuration of the cover body part as described above corresponds to a structure in which each of the multi