Composite cover plate for automobile inverter

Abstract

The utility model relates to a composite cover plate used for an automobile inverter, the composite cover plate comprises a lower layer aluminum cover plate, a viscoelastic fiber high polymer layer and an upper layer aluminum cover plate, the composite cover plate comprises the lower layer aluminum cover plate, the viscoelastic fiber high polymer layer and the upper layer aluminum cover plate from bottom to top in sequence, and the lower layer aluminum cover plate is provided with reinforcing ribs. Compared with the prior art, by designing the reinforcing ribs and using the viscoelastic fiber high polymer layer, the damping effect is adjustable, and the impedance performance can be adjusted to reach the maximum at the resonance frequency according to the resonance characteristic of an electric drive system so as to restrain the resonance peak value; the composite cover plate is integrally punched and formed, and compared with a traditional sound insulation foam pasting mode, the composite cover plate is more reliable in structure; the viscoelastic fiber high polymer layer has a high internal friction angle, vibration energy is converted into internal energy of the viscoelastic fiber high polymer layer and dissipated, and the effects of reducing mechanical vibration and lowering noise are achieved; mounting holes are uniformly formed, so that the fixing effect is better, and the stress is more uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile inverters, in particular to a composite cover plate used for automobile inverters. Background Art

[0002] The inverter is a core component of electric and hybrid vehicles, responsible for converting high-voltage direct current (DC) into alternating current (AC). Existing inverters are typically installed as separate components on the drive motor, with the inverter cover typically located at the top of the powertrain assembly. While the vehicle is in motion, it is subject to excitation from the ground, the motor's own rotational excitation, and component resonance. This ultimately manifests itself as a high level of noise from the inverter cover.

[0003] Major manufacturers are focusing on NVH (Noise, Vibration, and Harshness) issues in electric drive systems. Prolonged resonance not only impacts the passenger experience but can also lead to fatigue failure of internal structural components, compromising the safe operation of the inverter. Traditional inverter covers often utilize stamped structures, which have poor dynamic stiffness and low modal response, making them highly susceptible to NVH issues.

[0004] The utility model with publication number CN205544955U discloses an upper cover plate for an inverter housing. The upper cover plate for the inverter housing is provided with a card slot and a reinforcement plate. The reinforcement plate can significantly improve the strength of the upper cover plate. The card slot enables the upper cover plate to be quickly connected to other components on the inverter housing, avoiding the occurrence of cracking, slipping, root breakage, shrinkage, whitening and other phenomena caused by screw connections; this patent cannot effectively reduce the vibration intensity of the cover plate, reduce radiation noise, and improve the NVH performance of the electric drive system.

[0005] Therefore, it is an urgent problem to provide a cover plate that can effectively reduce the vibration intensity of the cover plate, reduce the radiation noise and improve the NVH performance of the electric drive system. Utility Model Content

[0006] The purpose of the present utility model is to provide a composite cover plate for an automobile inverter in order to overcome the defects of the prior art.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] According to one aspect of the present invention, a composite cover plate for an automobile inverter is provided, wherein the composite cover plate includes a lower aluminum cover plate, a viscoelastic fiber polymer layer and an upper aluminum cover plate. From bottom to top, the composite cover plate is composed of a lower aluminum cover plate, a viscoelastic fiber polymer layer and an upper aluminum cover plate, and the lower aluminum cover plate is provided with reinforcing ribs.

[0009] As a preferred technical solution, the composite cover plate further includes a high-voltage connector through hole, and the high-voltage connector passes through the composite cover plate through the hole.

[0010] As a preferred technical solution, the cross-section of the high-voltage connector through hole is elliptical.

[0011] As a preferred technical solution, high-voltage cover plate mounting holes are provided on both sides of the high-voltage connector through hole.

[0012] As a preferred technical solution, the reinforcing ribs are formed by stamping.

[0013] As a preferred technical solution, the reinforcing ribs include reinforcing rib a, reinforcing rib b, reinforcing rib c, reinforcing rib d, reinforcing rib e, reinforcing rib f, reinforcing rib g and reinforcing rib h.

[0014] As a preferred technical solution, the edge of the composite cover plate is provided with mounting holes and waist-shaped positioning holes.

[0015] As a preferred technical solution, the thickness of the upper aluminum cover plate and the lower aluminum cover plate is 0.75 mm.

[0016] As a preferred technical solution, the thickness of the viscoelastic fiber polymer layer is 0.04 mm.

[0017] As a preferred technical solution, the viscoelastic fiber polymer layer is made of acrylic rubber.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The utility model realizes adjustable damping effect by designing reinforcing ribs and using viscoelastic fiber polymer layers. According to the resonance characteristics of the electric drive system, the impedance performance can be adjusted to reach the maximum at the resonance frequency to suppress the resonance peak.

[0020] 2. The composite cover plate of the present invention is integrally stamped and formed, and has a more reliable structure compared to the traditional method of applying sound insulation foam.

[0021] 3. The viscoelastic fiber polymer layer of the present invention has a high internal friction angle, which converts vibration energy into internal energy of the viscoelastic fiber polymer layer and dissipates it, thereby achieving the effect of reducing mechanical vibration and lowering noise.

[0022] 4. The mounting holes of the utility model are evenly arranged, which has better fixing effect and more uniform force. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the local structure of the utility model;

[0024] Figure 2It is a schematic diagram of the overall structure of the utility model.

[0025] 1. Waist-shaped positioning hole; 2. Upper aluminum cover; 3. Viscoelastic fiber polymer layer; 4. Lower aluminum cover; 6. High-voltage connector through hole; 7. Reinforcement rib a; 8. Mounting hole; 9. Reinforcement rib b; 10. Reinforcement rib c; 11. Reinforcement rib d; 12. Reinforcement rib e; 13. Reinforcement rib f; 14. Reinforcement rib g; 15. Reinforcement rib h; 16. High-voltage cover mounting hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] The inverter is a core component of electric and hybrid vehicles, responsible for converting high-voltage direct current (DC) into alternating current (AC). Existing inverters are typically installed as separate components on the drive motor, with the inverter cover typically located at the top of the powertrain assembly. While the vehicle is in motion, it is subject to excitation from the ground, the motor's own rotational excitation, and component resonance. This ultimately manifests itself as a high level of noise from the inverter cover.

[0028] Major manufacturers are focusing on NVH (Noise, Vibration, Harshness) issues in electric drive systems. Prolonged resonance not only impacts the passenger experience but can also lead to fatigue failure of internal structural components, compromising the safe operation of the inverter. Traditional inverter covers often utilize stamped structures, which have poor dynamic stiffness and low modal response, making them highly susceptible to NVH issues. Automotive and parts manufacturers often use sound-insulating foam to mitigate NVH issues in inverter covers, but this method fails to fundamentally improve the cover's modal response and address vibration at its source.

[0029] The composite cover plate of the present invention is sequentially arranged from bottom to top as a lower aluminum cover plate, a viscoelastic fiber polymer layer and an upper aluminum cover plate. The lower aluminum cover plate is provided with reinforcing ribs to achieve adjustable damping effect. The impedance performance can be adjusted to reach a maximum at the resonance frequency according to the resonance characteristics of the electric drive system to suppress the resonance peak. The composite cover plate of the present invention is one-piece stamping and has a more reliable structure than the traditional sound insulation foam method. The viscoelastic fiber polymer layer of the present invention has a high internal friction angle, which converts vibration energy into the internal energy of the viscoelastic fiber polymer layer and dissipates it, thereby reducing mechanical vibration and noise. The mounting holes are evenly arranged in the present invention, which has a better fixing effect and more uniform force.

[0030] Example 1

[0031] like Figure 1 、 Figure 2 As shown, a composite cover plate for an automobile inverter includes a lower aluminum cover plate 4, a viscoelastic fiber polymer layer 3 and an upper aluminum cover plate 2. The composite cover plate is composed of a lower aluminum cover plate 4, a viscoelastic fiber polymer layer 3 and an upper aluminum cover plate 2 from bottom to top, and the lower aluminum cover plate 3 is provided with reinforcing ribs.

[0032] In this embodiment, by arranging a lower aluminum cover plate 4, a viscoelastic fiber polymer layer 3 and an upper aluminum cover plate 2 from bottom to top, and reinforcing ribs of the lower aluminum cover plate 3, the composite cover plate is placed on the inverter, which can effectively solve the NVH (Noise, Vibration, Harshness) problem of the electric drive system.

[0033] The composite cover plate further includes a high-voltage connector through hole 6 , and the high-voltage connector through hole 6 penetrates the composite cover plate.

[0034] The cross section of the high-voltage connector through hole 6 is elliptical.

[0035] High-voltage cover plate mounting holes 16 are provided on both sides of the high-voltage connector through hole 6 .

[0036] In this embodiment, the high-voltage cover plate mounting hole 16 is provided on the short side of the elliptical high-voltage connector through hole 6 .

[0037] The reinforcing ribs are formed by stamping.

[0038] The reinforcing ribs include reinforcing rib a7, reinforcing rib b9, reinforcing rib c10, reinforcing rib d11, reinforcing rib e12, reinforcing rib f13, reinforcing rib g14 and reinforcing rib h15.

[0039] The edge of the composite cover plate is provided with a mounting hole 8 and a waist-shaped positioning hole 1.

[0040] In this embodiment, the composite cover plate is a stamped sandwich structure, with ribs formed by stamping. The rib placement was optimized using finite element software topology optimization, targeting the highest modal value. There are 21 mounting holes 8, two high-voltage cover plate mounting holes 16, and two waist-shaped locating holes 1. The waist-shaped locating holes 1 are symmetrically located on both sides of the composite cover plate, adjacent to the mounting holes 8.

[0041] The thickness of the upper aluminum cover plate 2 is 0.75 mm, the thickness of the viscoelastic fiber polymer layer 3 is 0.04 mm, and the thickness of the lower aluminum cover plate 4 is 0.75 mm. The viscoelastic fiber polymer layer 3 has a high internal friction angle.

[0042] The viscoelastic fiber polymer layer 3 is made of acrylic rubber.

[0043] In this embodiment, the vibration and noise reduction effects are primarily achieved by the viscoelastic fiber polymer layer 3. This layer has a high internal friction angle. By constraining the upper and lower surfaces of the viscoelastic fiber polymer layer 3 with the lower aluminum cover plate 4 and the upper aluminum cover plate 2, the layer converts vibration energy into internal energy within the layer 3 and dissipates it, thereby reducing mechanical vibration and noise. Other materials with high internal friction angles can also be used for the viscoelastic fiber polymer layer 3.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A composite cover for an automobile inverter, characterized in that: The composite cover plate comprises a lower aluminum cover plate (4), a viscoelastic fiber polymer layer (3) and an upper aluminum cover plate (2); the composite cover plate comprises, from bottom to top, a lower aluminum cover plate (4), a viscoelastic fiber polymer layer (3) and an upper aluminum cover plate (2); and the lower aluminum cover plate (4) is provided with reinforcing ribs.

2. The composite cover plate for automobile inverter according to claim 1, characterized in that: The composite cover plate further comprises a high-voltage connector through hole (6), and the high-voltage connector through hole (6) penetrates the composite cover plate.

3. The composite cover plate for automobile inverter according to claim 2, characterized in that: The cross section of the high-voltage connector through hole (6) is elliptical.

4. The composite cover plate for automobile inverter according to claim 3, characterized in that: High-voltage cover plate mounting holes (16) are provided on both sides of the high-voltage connector through hole (6).

5. The composite cover plate for automobile inverter according to claim 1, characterized in that: The reinforcing ribs are formed by stamping.

6. The composite cover plate for automobile inverter according to claim 5, characterized in that: The reinforcing ribs include reinforcing rib a (7), reinforcing rib b (9), reinforcing rib c (10), reinforcing rib d (11), reinforcing rib e (12), reinforcing rib f (13), reinforcing rib g (14) and reinforcing rib h (15).

7. The composite cover plate for automobile inverter according to claim 1, characterized in that: The edge of the composite cover plate is provided with a mounting hole (8) and a waist-shaped positioning hole (1).

8. The composite cover plate for automobile inverter according to claim 1, characterized in that: The thickness of the upper aluminum cover plate (2) and the lower aluminum cover plate (4) is 0.75 mm.

9. The composite cover plate for automobile inverter according to claim 1, characterized in that: The viscoelastic fiber polymer layer (3) has a thickness of 0.04 mm.

10. The composite cover plate for automobile inverter according to claim 9, characterized in that: The viscoelastic fiber polymer layer (3) is made of acrylic rubber.

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