A high-voltage power line bundle anti-vibration structure, an anti-vibration assembly and a motor driving system

Abstract

This application relates to a vibration-damping structure, vibration-damping assembly, and motor drive system for high-voltage power harnesses, belonging to the field of automotive electronics technology. The vibration-damping structure for a high-voltage power harness includes a coaxially arranged housing, a rigid shield, and a flexible bushing. The housing has a through-hole for the harness to pass through. The rigid shield is connected to the housing, and the inner diameter of the rigid shield gradually decreases in the direction towards the housing. The flexible bushing is snapped into the rigid shield and at least partially extends out of the rigid shield. This application can effectively solve the problem of shielding wire breakage failure caused by tensile stress and shear stress at the root of the high-voltage power harness under various complex operating conditions during vehicle operation.

Description

Technical Field

[0001] This application relates to the field of automotive electronics technology, and in particular to a high-voltage power harness vibration-damping structure, vibration-damping assembly, and motor drive system. Background Technology

[0002] With the rapid development of new energy vehicle technology, the market share of electric vehicles and hybrid vehicles is constantly increasing. In these vehicles, the electric motor drive system is a core component, and the high-voltage power harness connecting the battery pack and the motor controller is the key carrier for its energy transmission. The reliability of the high-voltage power harness directly affects the vehicle's power performance, safety, and user experience.

[0003] The limited space in the front compartment of the vehicle for the motor drive system meant that the space for the high-voltage power harness routing could not meet the minimum turning radius design requirements, resulting in the breakage of the shielding strands of the high-voltage power harness during the vehicle road test phase.

[0004] Furthermore, during operation, automobiles are subjected to various complex vibration loads, such as uneven road surfaces, engine vibration, and motor vibration. Repeated vibration and bending conditions accelerate fatigue damage to the materials inside the wiring harness. Specifically, the shielding layer of the high-voltage power wiring harness is woven from multiple strands of fine copper wire, its main function being to provide electromagnetic shielding and prevent the generation and propagation of electromagnetic interference (EMI). Under repeated vibration and bending, the strands of the shielding layer are highly susceptible to breakage.

[0005] More seriously, once the shielding strands break, the ends of these broken metal wires may become sharp. Under continuous vibration, these sharp broken strands may pierce the insulation layer of the wire harness, leading to poor insulation or even short circuit between the high-voltage conductor and the external environment or vehicle chassis.

[0006] Therefore, there is an urgent need for a vibration-resistant structure for high-voltage power harnesses to solve the problem of shielding wire breakage and failure caused by tensile stress and shear stress at the root of the harness under various complex operating conditions during vehicle operation. Utility Model Content

[0007] The purpose of this application is to provide a high-voltage power harness anti-vibration structure, anti-vibration assembly and motor drive system, which can effectively solve the problem of shield wire breakage failure caused by tensile stress and shear stress at the root of the high-voltage power harness under various complex working conditions during vehicle operation.

[0008] Firstly, the high-voltage power harness vibration-resistant structure provided in this application adopts the following technical solution:

[0009] A vibration-resistant structure for high-voltage power harnesses, comprising a coaxial arrangement:

[0010] The housing has a wire pass-through hole for the wire harness to pass through;

[0011] A rigid shield is connected to the protective shell, and the inner diameter of the rigid shield gradually decreases in the direction toward the protective shell;

[0012] A flexible bushing is snapped into the rigid shield and extends at least partially out of the rigid shield.

[0013] By adopting the above solution, the protective shell provides a stable mounting base for the internal rigid shield, flexible bushing, and shielding ring, protecting the internal wiring harness from compression or impact. The gradual change in the inner diameter of the rigid shield and the synergistic effect of the flexible bushing create a stress-relieving structure with gradually varying stiffness, effectively solving the problem of shielding layer fracture caused by stress concentration and vibration at the root of the high-voltage power wiring harness.

[0014] Furthermore, a limiting hole communicating with the threading hole is provided at the end of the protective shell;

[0015] The flexible bushing includes:

[0016] The large neck is limited and set in the limiting hole, with one end abutting against the bottom wall of the limiting hole and the other end abutting against the rigid cover;

[0017] The small neck is connected to the large neck, its outer peripheral surface abuts against the inner peripheral surface of the rigid shield, and at least partially extends out of the rigid shield.

[0018] By adopting the above solution, the T-shaped flexible bushing design effectively matches the limiting hole at the end of the housing, effectively limiting the flexible bushing in the axial direction and preventing displacement or detachment during vibration or wire harness pulling, thus ensuring the stability of the installation. The small neck extending slightly beyond the rigid housing further enhances the buffering and protection of the wire harness root, especially in areas where the wire harness frequently bends, providing continuous and effective stress dispersion and vibration absorption.

[0019] Furthermore, the outer peripheral surface of the large neck abuts against the peripheral wall of the limiting hole.

[0020] By adopting the above solution, the flexible bushing is further effectively limited in the radial direction, which can effectively suppress the radial sway of the flexible bushing. At the same time, it also reduces the entry of dust, moisture and other particles or liquids from the gap between the flexible bushing and the limiting hole, thus enhancing the sealing performance of the structure.

[0021] Furthermore, a sealing ring is provided inside the limiting hole.

[0022] The above-mentioned solution can improve the sealing performance of the vibration-resistant structure.

[0023] Furthermore, one end of the large neck abuts against the end face of the sealing ring, and the other end of the large neck abuts against the rigid cover.

[0024] By adopting the above solution and using a flexible bushing as an intermediate buffer, the stress transmission between the sealing ring and the rigid cover is further optimized while protecting the wiring harness, reducing assembly stress and improving the overall reliability and durability of the sealing system.

[0025] Furthermore, a shielding ring is provided inside the threading hole.

[0026] By adopting the above solution and installing a shielding ring inside the wiring hole, the propagation of electromagnetic interference (EMI) can be effectively blocked, protecting the signal transmission inside the high-voltage power harness from the influence of the external electromagnetic environment. At the same time, it can also prevent the harness from radiating electromagnetic waves outward, thus meeting the stringent electromagnetic compatibility (EMC) requirements of automotive electronic products.

[0027] Furthermore, a plurality of reinforcing parts are evenly distributed on the outer peripheral surface of the rigid shield, and the reinforcing parts connect the rigid shield and the protective shell.

[0028] By adopting the above scheme, the overall rigidity and strength of the vibration-resistant structure are enhanced.

[0029] Furthermore, a number of snap-fit ​​holes are evenly distributed on the outer peripheral surface of the protective shell.

[0030] By adopting the above solution, a convenient and reliable installation method is provided for vibration-resistant structures.

[0031] Secondly, this application provides a vibration-resistant assembly, comprising:

[0032] Base;

[0033] Both of the above-mentioned vibration-resistant structures are integrated on the base;

[0034] One set of the vibration-damping structures is used to constrain the positive electrode wire harness, and the other set of the vibration-damping structures is used to constrain the negative electrode wire harness.

[0035] Thirdly, this application provides a motor drive system including the aforementioned vibration-resistant structure.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. By setting a rigid shield with a gradually decreasing inner diameter to form a transition fillet, and in conjunction with an internal flexible bushing, a gradual support from flexible to rigid is provided for the root of the high-voltage power harness. This effectively disperses the stress concentration when the harness is bent, avoids local high stress caused by sudden changes in stiffness, and thus significantly reduces the risk of fatigue fracture of the shield strands under vibration conditions.

[0038] 2. The flexible bushing is made of elastic materials such as silicone, which can effectively absorb and buffer vibration energy from the outside, reduce the vibration transmitted to the root of the wire harness, play a role in vibration reduction and protection, and further extend the service life of the wire harness.

[0039] 3. The overall structure is compact and occupies little space, making it easy to arrange and install in environments with limited space, such as the front compartment of a vehicle. At the same time, it realizes multiple functions of stress relief, buffering and protection at the root of the wiring harness, improving the reliability and safety of the entire motor drive system. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a side view of the vibration-damping assembly in this application.

[0042] Figure 2 This is a cross-sectional view of the vibration-resistant structure in this application.

[0043] Figure 3 This is a perspective view of the protective shell and rigid cover in this application.

[0044] Figure 4 This is a perspective view of the flexible bushing in this application.

[0045] In the picture:

[0046] 100. Protective shell; 110. Wiring hole; 120. Limiting hole; 130. Snap-fit ​​hole;

[0047] 200. Rigid protective cover;

[0048] 300, Flexible bushing; 310, Large neck; 320, Small neck;

[0049] 400, Sealing ring; 500, Shielding ring; 600, Reinforcing part; 700, Base; 800, Positive wire harness; 900, Negative wire harness. Detailed Implementation

[0050] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. The following embodiments are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the following description, the same reference numerals are used to denote the same or equivalent elements, and repeated descriptions are omitted.

[0051] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this application and to simplify the description, and are not intended to indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0052] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] It should also be further understood that the term “and / or” as used in this application refers to any combination of one or more of the listed items, and all possible combinations thereof.

[0054] Example:

[0055] Reference Figure 1 This application provides a vibration-damping assembly, which includes a base 700 and a set of vibration-damping structures. These vibration-damping structures are integrated onto the base 700, wherein one set of vibration-damping structures is used to constrain the positive electrode harness 800, and the other set of vibration-damping structures is used to constrain the negative electrode harness 900.

[0056] In a motor drive system, the positive and negative wiring harnesses 900 are typically arranged side-by-side. By integrating two vibration-resistant structures onto the same base 700, the wiring harness routing is standardized, reducing potential interference and wear between the harnesses. Simultaneously, the integrated design ensures that the positive and negative wiring harnesses 900 receive consistent vibration protection under the same reference, reducing uneven protection effects caused by installation errors or structural differences.

[0057] Example:

[0058] Reference Figures 1 to 4 This application provides a vibration-resistant structure for a high-voltage power harness, including a protective shell 100, a rigid cover 200, and a flexible bushing 300 arranged coaxially, which together provide support and protection for the high-voltage power harness (hereinafter referred to as the harness).

[0059] The housing 100 has a wire hole 110 for the wire harness to pass through. The housing 100 serves as the main part of the vibration-resistant structure, provides structural support for the wire harness, and serves as the connection interface between the vibration-resistant structure and the external environment (such as a motor drive system or vehicle chassis).

[0060] Meanwhile, to facilitate the installation of the vibration-resistant structure, a number of snap-fit ​​holes 130 are evenly distributed on the outer circumferential surface of the housing 100. These snap-fit ​​holes 130 can be engaged with corresponding clips or fasteners on the motor drive assembly housing or vehicle chassis to achieve quick and stable installation.

[0061] The number of snap-fit ​​holes 130 can be set according to the actual situation. For example, the number of snap-fit ​​holes 130 can be set to 2, 3, 4 or more. For example, the number of snap-fit ​​holes 130 is set to 3.

[0062] Furthermore, the rigid shield 200 is connected to the housing 100, and the inner diameter of the rigid shield 200 at the end away from the housing 100 gradually decreases in the direction toward the housing 100.

[0063] That is, the inner diameter of the rigid shield 200 is not constant, but forms a flared shape, with its inner diameter gradually decreasing in the direction towards the housing 100, thereby forming a smooth transition fillet at the wire harness exit to disperse stress concentration when the wire harness bends. At the same time, the inner circumference of the rigid shield 200 near the housing 100 limits the wire harness.

[0064] For example, the rigid cover 200 is detachably connected to the housing 100 to facilitate the maintenance and replacement of the rigid cover 200.

[0065] For example, the rigid shield 200 is fixedly connected to the housing 100 to enhance the structural strength of the connection between the rigid shield 200 and the housing 100. Based on this, as... Figure 3 As shown, a plurality of evenly distributed reinforcing parts 600 (e.g., reinforcing ribs) are provided on the outer peripheral surface of the rigid shield 200, and the plurality of reinforcing parts 600 are simultaneously connected to the rigid shield 200 and the shell 100.

[0066] For example, the reinforcing part 600 in this application is specifically configured as a reinforcing rib.

[0067] Meanwhile, the number of reinforcement units 600 can be set according to the actual situation. For example, the number of reinforcement units 600 can be set to 3, 4, 5 or more.

[0068] For example, the number of reinforcement sections 600 is set to 6.

[0069] Furthermore, based on the rigidity requirement of the rigid shield 200 and the structural strength requirement of the snap-fit ​​portion to enhance the connection between the rigid shield 200 and the shell 100, in a specific embodiment, the shell 100, the rigid shield 200 and several snap-fit ​​portions are integrally formed, and the shell 100, the rigid shield 200 and several snap-fit ​​portions are all formed by metal casting / die casting.

[0070] Furthermore, the flexible bushing 300 is snapped into the rigid cover 200, and at least partially extends out of the rigid cover 200. That is, a portion of the flexible bushing 300 is snapped into the rigid cover 200, while another portion extends out of the rigid cover 200. The flexible bushing 300 is made of a highly elastic, fatigue-resistant, and weather-resistant elastomer material, such as silicone rubber or ethylene propylene diene monomer (EPDM).

[0071] When the high-voltage power harness passes through the entire vibration-resistant structure, the flexible bushing 300 tightly wraps around the outside of the harness;

[0072] When the high-voltage power harness is subjected to vibration or bending force, the force first acts on the flexible bushing 300 portion extending from the rigid shield 200. The flexible bushing 300 undergoes elastic deformation, absorbing most of the vibration energy and stress. As the degree of bending increases, the harness gradually contacts the transition radius of the inner wall of the rigid shield 200.

[0073] Due to the presence of the flexible bushing 300 and the transition fillet, the stiffness at the root of the wire harness is gradually changed, from the purely flexible wire harness body, to the semi-flexible support provided by the flexible bushing 300, and then to the rigid support provided by the rigid shield 200. This effectively avoids stress concentration on a single cross section and effectively suppresses fatigue fracture of the shield strands.

[0074] Furthermore, in a more specific embodiment, such as Figure 2 As shown, the end of the protective shell 100 is provided with a limiting hole 120 that communicates with the wire hole 110. The limiting hole 120 is coaxial with the wire hole 110 and has a larger diameter, so as to limit the structure placed in the limiting hole 120.

[0075] Accordingly, the flexible bushing 300 is configured as a T-shaped structure, which includes a large neck 310 and a small neck 320 connected to the large neck 310.

[0076] During installation, the large neck 310 is positioned within the limiting hole 120, with one end abutting against the bottom wall of the limiting hole 120 and the other end abutting against the end face of the rigid cover 200. The small neck 320 of the flexible bushing 300 passes through the rigid cover 200, thereby achieving axial positioning of the flexible bushing 300. The outer circumferential surfaces of both the large neck 310 and the small neck 320 abut against the inner circumferential surface of the rigid cover 200 to achieve radial positioning of the flexible bushing 300. Through the mutual cooperation of the circumferential and end faces, the flexible bushing 300 is effectively limited in both the axial and radial directions, preventing displacement or detachment during vibration or wire harness pulling, thus ensuring the stability of the installation.

[0077] Furthermore, in another specific embodiment, a sealing ring 400 is provided inside the limiting hole 120 to improve the sealing performance of the structure. At this time, one end of the large neck 310 abuts against the end face of the sealing ring 400, and the other end of the large neck 310 abuts against the rigid cover 200.

[0078] By using the flexible bushing 300 as an intermediate buffer, the stress transmission between the sealing ring 400 and the rigid cover 200 is further optimized while protecting the wire harness. This reduces assembly stress, improves the overall reliability and durability of the sealing system, and effectively seals the equipment housing to prevent moisture, dust, and other contaminants from entering.

[0079] In addition, such as Figure 2 As shown, a shielding ring 500 is provided inside the wire hole 110 of the housing 100. The shielding layer of the high-voltage power harness provides electromagnetic shielding to the housing 100 (usually a metal housing 100 that is grounded) through the shielding ring 500, effectively blocking the propagation of electromagnetic interference (EMI) and achieving a reliable electrical connection.

[0080] It should be noted that this application does not limit the specific form in which the shielding ring 500 is installed in the wire hole 110. Exemplarily, the shielding ring 500 is fixed in the wire hole 110 by a press-fit. Exemplarily, the shielding ring 500 is fixed in the wire hole 110 by a snap-fit.

[0081] In summary, this application provides a stable mounting base for the internal rigid shield 200, flexible bushing 300, and shielding ring 500 through the protective shell 100, protecting the internal wiring harness from compression or impact. The gradual change in the inner diameter of the rigid shield 200 and the synergistic effect of the flexible bushing 300 create a stress-relieving structure with gradually changing stiffness, effectively solving the problem of shielding layer fracture caused by stress concentration and vibration at the root of the high-voltage power wiring harness. It has the advantages of simple structure, small space occupation, and significant protection effect, and has high practical value in the field of new energy vehicles.

[0082] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vibration-resistant structure for high-voltage power harnesses, characterized in that, Including coaxial settings: The housing (100) has a wire hole (110) for the wire harness to pass through; A rigid shield (200) is connected to the protective shell (100), and the inner diameter of the rigid shield (200) gradually decreases in the direction toward the protective shell (100); A flexible bushing (300) is snapped into the rigid cover (200) and extends at least partially out of the rigid cover (200).

2. The high-voltage power harness vibration-resistant structure according to claim 1, characterized in that, The end of the protective shell (100) is provided with a limiting hole (120) that communicates with the threading hole (110); The flexible bushing (300) includes: The large neck (310) is positioned within the limiting hole (120), with one end abutting against the bottom wall of the limiting hole (120) and the other end abutting against the rigid cover (200). The small neck (320) is connected to the large neck (310), its outer peripheral surface abuts against the inner peripheral surface of the rigid shield (200), and is at least partially extended out of the rigid shield (200).

3. The high-voltage power harness vibration-resistant structure according to claim 2, characterized in that, The outer peripheral surface of the large neck (310) abuts against the peripheral wall of the limiting hole (120).

4. The high-voltage power harness vibration-resistant structure according to claim 2, characterized in that, A sealing ring (400) is provided inside the limiting hole (120).

5. The high-voltage power harness vibration-resistant structure according to claim 4, characterized in that, One end of the large neck (310) abuts against the end face of the sealing ring (400), and the other end of the large neck (310) abuts against the rigid cover (200).

6. The high-voltage power harness vibration-resistant structure according to claim 1, characterized in that... A shielding ring (500) is provided inside the threading hole (110).

7. The high-voltage power harness vibration-resistant structure according to claim 1, characterized in that, The rigid shield (200) has a plurality of reinforcing parts (600) evenly distributed on its outer peripheral surface, and the reinforcing parts (600) connect the rigid shield (200) and the shell (100).

8. The high-voltage power harness vibration-resistant structure according to claim 1, characterized in that, The outer circumferential surface of the protective shell (100) is provided with a plurality of snap-fit ​​holes (130).

9. A vibration-damping assembly, characterized in that, include: Base (700); A pair of vibration-resistant structures according to any one of claims 1-8, both of which are integrated on the base (700); One set of the vibration-damping structures is used to constrain the positive electrode harness (800), and the other set of the vibration-damping structures is used to constrain the negative electrode harness (900).

10. A motor drive system, characterized in that, Includes the vibration-damping assembly as described in claim 9.

Images