Fixing structure for lower swing arm of new energy automobile

Abstract

The utility model discloses a fixing structure for a lower swing arm of a new energy automobile, which belongs to the related technical field of automobile structures and comprises a frame, a first fixing seat, a first elastic flat washer, a second fixing seat, a second elastic flat washer, the lower swing arm, a third fixing seat, a third elastic flat washer, a fourth fixing seat and a fourth elastic flat washer. The first fixing seat and the second fixing seat as well as the third fixing seat and the fourth fixing seat are of split structures and are welded on the frame in pairs, so that the stress of the fixing seats is reduced, the strength of the fixing seats is improved, and the potential quality hazard that the fixing seats are cracked and fractured under the conditions of high load and long-time use is solved; the lower swing arm first spacer bush and the lower swing arm second spacer bush are connected with the fixing seat and the middle through the elastic flat washers, stability and reliability of connection between the lower swing arm and the fixing seat are improved, the potential quality hazard that the lower swing arm is loosened and generates abnormal sound under high load and long-time use is solved, and the lower swing arm is suitable for being further popularized and used by large and small vehicle factories.

Description

Technical Field

[0001] This utility model belongs to the technical field of vehicle structure, specifically relating to a fixing structure for the lower control arm of a new energy vehicle. Background Technology

[0002] Currently, new energy vehicles have become one of the main means of transportation in my country. Key components of the front suspension of new energy vehicles include the lower control arm, which is connected to the vehicle frame via a mounting bracket. Currently, the mounting bracket for the lower control arm is an integral structure welded to the frame. Excessive stress and stress concentration at the mounting bracket easily lead to micro-cracks, affecting its strength. Under high loads and prolonged use, these micro-cracks may gradually expand, eventually causing the mounting bracket to crack and fracture. The mounting bracket is a die-stamped part, and the lower control arm spacer is directly connected to the mounting bracket via hexagonal head bolts. Minor unevenness exists on the contact surface of the mounting bracket, which easily leads to stress concentration under high loads and prolonged use, causing the lower control arm connection to loosen and resulting in abnormal noises during vehicle operation. The new energy vehicle market urgently needs a lower control arm fixing structure that improves the strength of the mounting bracket, solves the quality hazard of cracking and fracture under high loads and prolonged use, improves the stability and reliability of the lower control arm connection, and resolves the quality hazard of loosening and abnormal noises caused by the lower control arm under high loads and prolonged use. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a fixing structure for the lower control arm of a new energy vehicle.

[0004] A fixing structure for the lower control arm of a new energy vehicle, wherein a first fixing seat, a second fixing seat, a third fixing seat and a fourth fixing seat are sequentially provided on one side of the vehicle frame, and are welded and fixed to the vehicle frame by welding process;

[0005] The first fixed seat, the first elastic flat washer, the first spacer of the lower swing arm, the second elastic flat washer, and the second fixed seat are sequentially connected and fixed together with hexagonal head bolts.

[0006] The third fixed seat, the third elastic flat washer, the second spacer of the lower swing arm, the fourth elastic flat washer, and the fourth fixed seat are sequentially connected and fixed together using hexagonal head bolts.

[0007] Furthermore, the frame material is low-carbon, low-silicon, high-strength steel AG700L.

[0008] Furthermore, the first fixing seat, the second fixing seat, the third fixing seat, and the fourth fixing seat are all die-stamped and bent parts with a through hole in the middle and 90° bends on the upper and lower sides. The material is low-carbon, low-silicon, high-strength steel AG700L.

[0009] The first, second, third, and fourth fixing seats are all separate structures. Welding each fixing seat avoids excessive stress and stress concentration between them. The first and second fixing seats are welded together and connected with hexagonal head bolts to form a whole structure.

[0010] The third and fourth fixing seats are welded together and connected with hexagonal head bolts to form a single structure.

[0011] Furthermore, the first, second, third, and fourth elastic flat washers are circular with a through hole in the middle. They are first ground to improve the surface flatness, then stamped and heat-treated. The material is low-manganese spring steel 65Mn.

[0012] Furthermore, the two end faces of the first spacer of the lower swing arm are in contact with the first elastic flat washer and the second elastic flat washer, and the two end faces of the second spacer of the lower swing arm are in contact with the third elastic flat washer and the fourth elastic flat washer.

[0013] Furthermore, the first elastic flat washer contacts the first fixed seat, the second elastic flat washer contacts the second fixed seat, the third elastic flat washer contacts the third fixed seat, and the fourth elastic flat washer contacts the fourth fixed seat. When the first elastic flat washer, the second elastic flat washer, the third elastic flat washer, and the fourth elastic flat washer work, they increase the friction force area and enhance the lower swing arm connection.

[0014] This utility model has the following beneficial effects:

[0015] 1. The fixing structure of this utility model, the first fixing seat, the second fixing seat, the third fixing seat and the fourth fixing seat are all separate structures and are welded to the frame in pairs, which reduces the stress at the fixing seat, improves the strength at the fixing seat, and solves the quality hazard of cracking and breaking of the fixing seat under high load and long-term use.

[0016] 2. The first and second spacers of the lower swing arm of this utility model are connected to each fixed seat by an elastic flat washer. Because the working surface of the elastic flat washer is flatter, the stability of the lower swing arm connection is enhanced. Because the elastic flat washer increases the friction area during operation, the reliability of the lower swing arm connection is enhanced, thus solving the quality problem of the lower swing arm loosening and abnormal noise under high load and long-term use.

[0017] 3. The fixed structure of this utility model has simple component structure, low design cost, and convenient installation and maintenance, making it suitable for further promotion and use by vehicle manufacturers of all sizes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of the lower control arm of this utility model.

[0020] In the diagram: 1. Frame; 2. First mounting bracket; 3. First elastic flat washer; 4. Second mounting bracket; 5. Second elastic flat washer; 6. Lower control arm; 61. First spacer of lower control arm; 62. Second spacer of lower control arm; 7. Third mounting bracket; 8. Third elastic flat washer; 9. Fourth mounting bracket; 10. Fourth elastic flat washer. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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 utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. This is only relevant to those skilled in the art.

[0024] Example

[0025] Please see Figure 1-2 This utility model provides a technical solution:

[0026] The frame 1 is provided with a first fixing seat 2, a second fixing seat 4, a third fixing seat 7 and a fourth fixing seat 9 in sequence on one side, and is welded and fixed to the frame 1 by welding process;

[0027] The first fixed seat 2, the first elastic flat washer 3, the first spacer 61 of the lower swing arm, the second elastic flat washer 5, and the second fixed seat 4 are connected and fixed together in sequence by passing through hexagonal head bolts;

[0028] The third fixed seat 7, the third elastic flat washer 8, the second spacer 62 of the lower swing arm, the fourth elastic flat washer 10, and the fourth fixed seat 9 are connected and fixed together in sequence by passing through hexagonal head bolts.

[0029] As shown in the figure, a specific embodiment of the lower control arm fixing structure for new energy vehicles includes components such as a frame, a mounting base, washers, spacers, bolts, and a lower control arm. The mounting base is securely mounted on the frame and has mounting holes for connecting and fixing the lower control arm. The inner end of the lower control arm has mounting holes corresponding to those of the mounting base. Bolts are used to fix this end of the lower control arm to the mounting base on the frame. The bolts pass through the aligned mounting holes of the lower control arm and the mounting base, achieving a hinged connection between the two. Washers and spacers are installed together with the bolts to strengthen the support and cushioning of the connection area.

[0030] In this embodiment, the lower control arm is reliably assembled onto the vehicle frame via the aforementioned connecting components. The specific installation method is as follows: First, place the inner end of the lower control arm on the mounting base, aligning its mounting hole with the mounting hole of the mounting base. Then, insert a spacer into the bushing cavity within the mounting hole of the lower control arm, serving as a support and isolation component for the bolt. Next, install washers on both ends of the bolt, and then pass the bolt sequentially through the washers, the mounting hole of the lower control arm, and the mounting hole of the mounting base, ensuring the bolt passes through all the aforementioned components. After the bolt protrudes from the other side of the mounting base, install the nut and tighten it to lock it in place. Through these steps, the bolt and nut securely clamp and connect the mounting base, lower control arm, washers, and spacer together, ensuring accurate positioning of each component and a stable and reliable connection. The washers are placed between the lower control arm and the bolt head, and between the mounting base and the nut, to increase the stress surface and protect the contact surface; the spacer is fitted onto the bolt shank and located within the bushing cavity of the lower control arm, its length matching the assembly clearance between the mounting base and the lower control arm. When the nut is tightened, the two ends of the spacer press against the inner side of the fixing seat and the washer respectively, thereby accurately positioning the lower control arm in the axial direction and preventing the bolt from excessively pressing the lower control arm bushing or creating assembly gaps.

[0031] After assembly, the lower control arm fixing structure maintains a stable working state during vehicle operation. When the vehicle travels over bumpy roads or brakes suddenly, the lower control arm swings up and down relative to the frame around the bolt axis to achieve wheel suspension movement. At this time, the mounting bracket transfers the dynamic load borne by the lower control arm to the frame, and the washers and spacers play a crucial role in this process. On one hand, the spacer acts as a supporting medium between the bolt and the lower control arm bushing, ensuring that the bolt clamping force is transmitted axially and preventing displacement due to lateral compression or loosening of the lower control arm bushing. On the other hand, the washer, located at the contact surface, increases the stress-bearing area and provides a certain degree of cushioning. When the lower control arm is subjected to impact loads, the washer disperses the stress originally concentrated at the edge of the mounting hole of the mounting bracket. By increasing the contact area between the mounting bracket and the lower control arm, the washer effectively reduces local stress concentration in the mounting bracket, mechanically avoiding the risk of fracture due to local overload under high-load impacts, a risk inherent in traditional mounting brackets. Meanwhile, the combination of the washer and spacer makes the bolt connection more secure and stable: the spacer covers the gap between the bolt and the lower control arm bushing, and when the bolt is tightened, the spacer is compressed, forming a rigid support between the metal parts inside the lower control arm bushing and the fixed seat, eliminating any excess gap or relative slippage. This prevents the connection from loosening during driving, avoiding the "thumping" noise caused by component shaking and collision.

[0032] Furthermore, the washer also optimizes the friction interface. When the nut tightens the bolt, the washer fits tightly against the mounting base and the bolt head / nut surface, forming a large planar contact. When the lower control arm swings around the bolt, its bushing mainly undergoes elastic deformation and rotates relative to the spacer, resulting in virtually no sliding friction between the mounting base and the washer. This avoids the noise generated by direct metal-to-metal friction that can occur in traditional structures. Additionally, the presence of the washer increases the friction area between the bolt and the mounting base, making the bolt less prone to loosening under vehicle vibration conditions and further enhancing the long-term stability of the connection. In summary, this lower control arm fixing structure achieves a more stable and reliable connection through stress dispersion by the washer and precise positioning by the spacer, effectively solving the problems of traditional mounting bases being prone to breakage and abnormal noise under high loads.

[0033] The aforementioned fixing structure of this utility model can also have various optional variations and improvements to adapt to different design requirements and application scenarios. For example, the material and shape of the washer can be adjusted as needed: in one variation, the washer can be made of high-strength metal material to provide rigid support and a larger force-bearing surface; in another variation, the washer can also be made of elastic material, utilizing its elastic deformation to further absorb vibration and reduce noise. The shape of the washer is not limited to a flat washer form; it can be designed as a wave-shaped spring washer, a conical washer, or a washer with a flange edge, etc., as needed, thereby adjusting the connection preload or increasing the contact area to further optimize the connection performance.

[0034] For example, the number and layout of the fixing seats can also be varied: in this embodiment, a single fixing seat is used to connect to the lower swing arm, but in other embodiments, two fixing seats can be set above and below or to the left and right sides of the mounting point of the lower swing arm, forming a double-support structure that clamps and fixes the end of the lower swing arm. When using double fixing seats for clamping, the bushing of the lower swing arm will be supported by both sides simultaneously, and the bolts pass through the upper and lower fixing seats, realizing a connection structure similar to a "double scissor" structure, thereby significantly improving the bending strength and stability of the connection part, and further reducing the possibility of deformation or breakage of the fixing seats under high loads. Conversely, for situations with smaller loads or limited structural space, only one fixing seat can be used in conjunction with a pad or reinforcing member at the other end for support, in order to simplify the structure and reduce weight.

[0035] Furthermore, alternative structural designs can be used for the gasket and spacer. For example, the two ends of the spacer can be machined into protruding flanges, allowing the ends to directly function as gaskets, thus eliminating the need for separate gaskets; alternatively, the gasket and spacer can be designed as an integrated sleeve assembly, which is fitted onto the bolts at the designated positions during installation, providing both clearance isolation and load-bearing surface support in one step. This integrated structure not only reduces the number of parts and facilitates assembly but also ensures the relative positions of the gasket and spacer, avoiding assembly errors.

[0036] For example, the material of the spacer can be adjusted as needed: it can be made of metal to provide high-strength support, or of rigid engineering plastic to provide electrical isolation and shock absorption. All of the above options fall within the protection scope of this utility model, achieving stress dispersion, stable connection, and noise reduction through different methods. They can be selected and combined according to the specific needs of the suspension structure of new energy vehicles.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fixing structure for a lower control arm of a new energy vehicle, comprising a frame (1), a first elastic flat washer (3), a second elastic flat washer (5), a lower control arm (6), a third elastic flat washer (8), and a fourth elastic flat washer (10), characterized in that: The frame (1) is provided with a first fixing seat (2), a second fixing seat (4), a third fixing seat (7) and a fourth fixing seat (9) in sequence on one side, and is welded and fixed to the frame (1) by welding process; The first fixed seat (2), the first elastic flat washer (3), the first spacer sleeve (61) of the lower swing arm, the second elastic flat washer (5), and the second fixed seat (4) are connected and fixed together in sequence by passing through hexagonal head bolts; The third fixed seat (7), the third elastic flat washer (8), the second spacer of the lower swing arm (62), the fourth elastic flat washer (10), and the fourth fixed seat (9) are connected and fixed together in sequence by hexagonal head bolts.

2. The fixing structure for the lower control arm of a new energy vehicle according to claim 1, characterized in that: The frame (1) is made of low-carbon, low-silicon, high-strength steel AG700L.

3. The fixing structure for the lower control arm of a new energy vehicle according to claim 1, characterized in that: The first fixing seat (2), the second fixing seat (4), the third fixing seat (7), and the fourth fixing seat (9) are all die-stamped and bent parts with a through hole in the middle and 90° bends on the upper and lower sides. The material is low-carbon, low-silicon, high-strength steel AG700L. The first fixing seat (2), the second fixing seat (4), the third fixing seat (7) and the fourth fixing seat (9) are all separate structures. After welding each fixing seat, excessive stress and stress concentration between them are avoided. The first fixing seat (2) and the second fixing seat (4) are welded in pairs and connected with hexagonal head bolts to form a whole structure. The third fixing seat (7) and the fourth fixing seat (9) are welded together and connected with hexagonal head bolts to form a whole structure.

4. The fixing structure for a lower control arm of a new energy vehicle according to claim 1, characterized in that: The first elastic flat washer (3), the second elastic flat washer (5), the third elastic flat washer (8), and the fourth elastic flat washer (10) are circular with a through hole in the middle. They are first ground to improve the surface flatness, then stamped and heat-treated. The material is low manganese spring steel 65Mn.

5. The fixing structure for the lower control arm of a new energy vehicle according to claim 1, characterized in that: The two ends of the first spacer (61) of the lower swing arm are in contact with the first elastic flat washer (3) and the second elastic flat washer (5), and the two ends of the second spacer (62) of the lower swing arm are in contact with the third elastic flat washer (8) and the fourth elastic flat washer (10).

6. The fixing structure for a lower control arm of a new energy vehicle according to claim 1, characterized in that: The first elastic flat washer (3) contacts the first fixed seat (2), the second elastic flat washer (5) contacts the second fixed seat (4), the third elastic flat washer (8) contacts the third fixed seat (7), and the fourth elastic flat washer (10) contacts the fourth fixed seat (9). When the first elastic flat washer (3), the second elastic flat washer (5), the third elastic flat washer (8), and the fourth elastic flat washer (10) work, they increase the friction area and enhance the connection of the lower swing arm.

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