New energy vehicle suspension and its lateral stabilizer

Abstract

This invention belongs to the field of automotive parts and equipment, specifically a suspension system for new energy vehicles and its lateral stabilizer bar. It includes a middle section and first and second connecting sections located at both ends of the middle section. The middle section has a regular polygonal inner hole, within which a regular polygonal mandrel is disposed. Elastic support members are located at both ends of the mandrel. The mandrel is coaxial with the middle section, and a gap exists between the outer wall of the mandrel and the inner wall of the middle section. This allows the outer wall of the mandrel to contact the inner wall of the middle section when the middle section deforms under torque, thereby changing the overall torsional stiffness. This invention achieves automatic stiffness adjustment while avoiding overly complex structures and reducing production costs.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts and equipment, and in particular to a new energy vehicle suspension and its lateral stabilizer bar. Background Technology

[0002] The suspension is a force-transmitting connection component set between the vehicle frame and the axle. Currently, the suspension of new energy vehicles and the suspension of traditional fuel vehicles are basically the same in structure, including elastic elements, shock absorbers, guiding mechanisms, and lateral stabilizer bars. However, the battery pack of new energy vehicles is heavier, and the load-bearing components such as elastic elements, shock absorbers, and lateral stabilizer bars must be strengthened to withstand greater static and dynamic loads.

[0003] Lateral stabilizer bars are used to suppress body roll and improve cornering stability. They are typically C-shaped or U-shaped, with the middle section mounted on the longitudinal beams or subframe via rubber bushings, and the two ends connected to the left and right suspensions. Since the battery pack accounts for 30%-50% of the weight of new energy vehicles, although the center of gravity is low, the total mass is significantly increased, resulting in higher centrifugal loads during cornering compared to comparable gasoline vehicles. The torsional stiffness of stabilizer bars in traditional gasoline vehicles is designed for conventional loads; directly transplanting this design to new energy vehicles results in insufficient stiffness redundancy: the stabilizer bar torsional amplitude is too large during cornering, failing to effectively limit the compression of the outer suspension, leading to excessive body roll angles; however, blindly increasing stiffness can exacerbate road bump transmission during straight-line driving, reducing comfort.

[0004] Currently, in order to solve the problem that the stiffness of traditional stabilizer bars cannot be adjusted, some automakers have added stiffness adjustment structures such as hydraulic drive and electronic control adjustment, as shown in existing technologies such as CN201811441777.6-Vehicle suspension stabilizer and vehicle, CN201520656898.8-Stabilizer bar assembly, stabilizer bar system and vehicle, and CN201520337744.2-A stabilizer bar assembly and vehicle. These stabilizer bars have complex structures and high costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a suspension for new energy vehicles and its lateral stabilizer bar, which can achieve automatic stiffness adjustment, avoid excessive structural complexity, and reduce production costs.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: a lateral stabilizer bar, including a middle section and a first connecting section and a second connecting section located at both ends of the middle section. The middle section has a regular polygonal inner hole, and a regular polygonal mandrel is disposed in the regular polygonal inner hole. Elastic support members are disposed at both ends of the mandrel. The mandrel is coaxial with the middle section, and there is a gap between the outer wall of the mandrel and the inner wall of the middle section, so that when the middle section is subjected to torque and deforms, the outer wall of the mandrel contacts the inner wall of the middle section to change the overall torsional stiffness.

[0007] Furthermore, the intermediate section includes a first intermediate section and a second intermediate section. The first intermediate section is integrally formed with the first connecting section, and the second intermediate section is integrally formed with the second connecting section. The first connecting section and the second connecting section are solid rods, and the first intermediate section and the second intermediate section are fixedly connected.

[0008] Furthermore, the outer wall of the end where the first intermediate section and the second intermediate section are connected to each other is provided with a plurality of axial grooves, and the outer wall of the first intermediate section and the second intermediate section is fitted with a connecting sleeve. The inner wall of the connecting sleeve is provided with a plurality of axial transmission teeth, each transmission tooth being located in a groove and having an interference fit with the groove.

[0009] Furthermore, the mandrel has first positioning blind holes on both ends and multiple second positioning blind holes on its sidewalls. The elastic support includes an axial support spring and a radial support spring. One end of the axial support spring is located in the first positioning blind hole, and the other end is pressed against the bottom of the regular polygonal inner hole. One end of the radial support spring is located in the second positioning blind hole, and the other end is pressed against the wall of the regular polygonal inner hole.

[0010] Furthermore, the preparation method includes: The bar stock is cut into two sections; The two sections of bar stock are bent into the first half of the rod and the second half of the rod. The first half of the rod is machined to the design dimensions to obtain the first intermediate section and the first connecting section. The second half of the rod is machined to the design dimensions to obtain the second intermediate section and the second connecting section. Regular polygonal inner holes are machined at the ends of the first and second intermediate sections; Machining a mandrel, and machining first positioning blind holes at both ends of the mandrel, and machining multiple second positioning blind holes on the side wall of the mandrel; Insert the axial support spring into the first positioning blind hole, insert the radial support spring into the second positioning blind hole, and compress the radial support spring into the second positioning blind hole. Then, insert one end of the mandrel into the first intermediate section and the other end into the second intermediate section, and move the first intermediate section and the second intermediate section until the end faces of the first intermediate section and the second intermediate section are in contact.

[0011] Furthermore, after bending the two bar sections into shape, the first half of the bar and the second half of the bar are subjected to stress-relief annealing. After the first and second halves of the rod are machined to the designed dimensions, the first and second halves of the rod are heated to the complete austenitization temperature and held at that temperature for at least 2 hours. Then they are transferred to a salt bath furnace or atmosphere furnace at a temperature 10-30°C below the bainite transformation temperature and held at that temperature for 1-2 hours before being taken out and air-cooled.

[0012] Further, after machining the regular polygonal inner hole, an electrode and an insulating sleeve are manufactured. The insulating sleeve is fixedly fitted onto the outer wall of the electrode, and the insulating sleeve is in the shape of a regular polygon. A discharge microchannel that penetrates the insulating sleeve radially is provided at the edge of the insulating sleeve. The electrode is placed into the regular polygonal inner hole, with a gap between the insulating sleeve and the regular polygonal inner hole. An organic electrolyte containing a penetrating material is injected into the regular polygonal inner hole. Then, a pulsed high voltage of 10-50kV is passed to the electrode. Under the electric field gradient, the organic electrolyte at the corner is broken down, generating plasma. The plasma beam directly bombards and heats the corner of the regular polygonal inner hole. Under the drive of the plasma, the penetrating material is injected and diffused into the corner of the regular polygonal inner hole, thereby forming a local reinforcement zone at the corner of the regular polygonal inner hole.

[0013] Furthermore, the inner hole of the regular polygon is a regular hexagonal inner hole.

[0014] Furthermore, the inner wall of the intermediate section and the outer wall of the mandrel are provided with a wear-resistant coating.

[0015] New energy vehicle suspension, including the aforementioned stabilizer bar.

[0016] The beneficial effects of this invention are as follows: As is known, the middle part of the stabilizer bar is the critical part that bears the largest combined bending and torsional loads and is most prone to fatigue. In order to achieve sufficient roll stiffness, traditional one-piece solid bars often use a large diameter design at this point, resulting in high stiffness even when the vehicle is driving smoothly, but at the expense of comfort.

[0017] The present invention sets the middle section as hollow, which has low stiffness. When the vehicle is driving smoothly, the height difference between the left and right wheels is small, the force and deformation of the lateral stabilizer bar are small, and the deformation of the middle section is also relatively small. The middle section will not contact the mandrel. The overall torsional stiffness is provided only by the hollow middle section itself, keeping it at a low stiffness, thereby effectively filtering road vibration, reducing bumps, and ensuring driving comfort.

[0018] When the vehicle tilts left or right, one end of the stabilizer bar moves upward and the other end moves downward. The middle section deforms under bending and torque, and the greater the tilt angle, the greater the deformation of the middle section. When the bending or torsional deformation of the middle section reaches a point where there is a gap between the outer wall of the mandrel and the inner wall of the middle section, the inner wall of the middle section will contact the outer wall of the mandrel, at which point the load is transferred to the mandrel. Because the mandrel is a solid rod with high stiffness and strong resistance to deformation, when the inner wall of the middle section contacts the outer wall of the mandrel, the stiffness of the entire middle section increases significantly and non-linearly, enhancing its resistance to deformation and thus strongly suppressing body roll and improving handling stability.

[0019] As can be seen, the stiffness of the middle section of the present invention can automatically change according to the actual load, matching the vehicle's dual requirements for comfort and handling.

[0020] The inner hole of the middle section is designed as a regular polygon, and the mandrel is also a regular polygon, coaxial with the middle section. Each sidewall of the mandrel is parallel to one inner wall of the regular polygonal inner hole. When the middle section undergoes significant torsional deformation, the edges of the regular polygonal inner hole (the intersection of the two inner walls) are pressed towards the mandrel. Because the sidewall of the mandrel is parallel to the inner wall of the inner hole, the edges of the inner hole precisely fit with the corresponding edges of the mandrel, forming a surface-contact mechanical self-locking structure. At this moment, the stiffness of the middle section is instantly and significantly increased, strongly suppressing body roll and ensuring handling stability. Compared to a circle, a regular polygon increases the contact area between the mandrel and the middle section, and a circle does not have a self-locking function.

[0021] Furthermore, the lateral stabilizer bar of the present invention is implemented by a purely mechanical structure, requiring no electronic sensors or controllers, and is simple in structure, fast in response, reliable and durable, and has low production cost. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of the lateral stabilizer bar of the present invention; Figure 2 This is a schematic diagram of the main sectional view of the middle section; Figure 3 yes Figure 2 Schematic diagram of the cross section of AA; Figure 4 yes Figure 2 Enlarged schematic diagram of part B; Figure 5 This is a schematic diagram illustrating the reinforcement of the inner corners of a regular polygon; Figure 6 yes Figure 5 Cross-sectional view of CC; Reference numerals: 1—Intermediate section; 11—First intermediate section; 12—Second intermediate section; 13—Connecting sleeve; 14—Transmission gear; 2—First connecting section; 3—Core rod; 4—Elastic support; 41—Axial support spring; 42—Radial support spring; 5—Second connecting section; 6—Electrode; 7—Insulating sleeve; 71—Discharge microchannel. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] The new energy vehicle suspension of the present invention includes a lateral stabilizer bar, such as... Figures 1 to 4 As shown, it includes a middle section 1 and a first connecting section 2 and a second connecting section 5 located at both ends of the middle section 1.

[0025] The middle section 1 has a regular polygonal inner hole, preferably a regular hexagonal inner hole. A regular polygonal core rod 3 is set in the regular polygonal inner hole. The shape of the core rod 3 is adapted to the shape of the regular polygonal inner hole and is a solid hexagonal prism.

[0026] The mandrel 3 has elastic support members 4 at both ends, which support the mandrel 3 so that it is suspended in the inner hole of the regular polygon. The mandrel 3 is coaxial with the middle section 1, and each side of the mandrel 3 is parallel to a side wall of the inner hole of the regular polygon. There is a gap between the outer wall of the mandrel 3 and the inner wall of the middle section 1, so that when the middle section 1 is subjected to torque and deforms, the outer wall of the mandrel 3 contacts the inner wall of the middle section 1 to change the overall torsional stiffness.

[0027] Specifically, the mandrel 3 has first positioning blind holes on both ends and multiple second positioning blind holes on its sidewalls. The elastic support 4 includes an axial support spring 41 and a radial support spring 42. One end of the axial support spring 41 is located in the first positioning blind hole, and the other end is pressed against the bottom of the regular polygonal inner hole. One end of the radial support spring 42 is located in the second positioning blind hole, and the other end is pressed against the wall of the regular polygonal inner hole. Both the axial support spring 41 and the radial support spring 42 are in a compressed state and have elasticity. Under the action of the axial support spring 41, the axial position of the mandrel 3 can be reset after a change. Under the action of the multiple radial support springs 42, the mandrel 3 can be stably suspended in the regular polygonal inner hole, and the gaps from each side to the inner wall of the regular polygonal inner hole are equal, preferably controlled within 0.2-0.5 mm.

[0028] When the vehicle is traveling smoothly, the slight height difference between the left and right wheels caused by road bumps results in a small torque and bending moment on the lateral stabilizer bar, minimal deformation of the middle section 1, and maintenance of the gap between the core rod 3 and the inner wall. At this time, the torsional stiffness of the system is entirely provided by the torsional stiffness of the hollow middle section 1 itself, which has low stiffness and effectively filters road vibrations, ensuring ride comfort.

[0029] When the vehicle makes a sharp turn or experiences significant body roll during aggressive driving, the combined bending and torsional load on the middle section 1 increases dramatically, causing its deformation to exceed the clearance. At this point, the outer wall of the mandrel 3 will come into contact with one or more planes of the regular polygonal inner wall of the middle section 1. Since the mandrel 3 is a solid structure, its stiffness is much greater than that of the hollow middle section 1. After they come into contact, they jointly participate in the load-bearing, forming a composite force-bearing body. This causes a nonlinear jump in the overall torsional stiffness of the middle section 1, thereby strongly suppressing further body roll and significantly improving handling stability.

[0030] The inner hole of the intermediate section 1 is set as a regular polygon, and the mandrel 3 is also a regular polygon. When the intermediate section 1 undergoes significant torsional deformation, the edges of the regular polygonal inner hole (the intersection of the two inner walls) are pressed towards the mandrel 3. Since the sidewall of the mandrel 3 is parallel to the inner wall of the inner hole, the edges of the inner hole will precisely fit with the corresponding edges of the mandrel 3, forming a surface contact mechanical self-locking structure. At this time, the stiffness of the intermediate section 1 is instantly and significantly increased, strongly suppressing body roll and ensuring handling stability. Compared with a circle, a regular polygon can increase the contact area between the mandrel 3 and the intermediate section 1, and a circle does not have a self-locking function.

[0031] The intermediate section 1, the first connecting section 2, and the second connecting section 5 can be hollow tubular components. Lateral stabilizer bars typically require bending, which can easily deform the tubular components, leading to uneven wall thickness. In this invention, to facilitate the manufacturing of the lateral stabilizer bar, as a preferred embodiment, the intermediate section 1 includes a first intermediate section 11 and a second intermediate section 12, with the end faces of the first intermediate section 11 and the second intermediate section 12 joined together to form the complete intermediate section 1. The first intermediate section 11 is integrally formed with the first connecting section 2, and the second intermediate section 12 is integrally formed with the second connecting section 5. The first connecting section 2 and the second connecting section 5 are solid rods, and the first intermediate section 11 and the second intermediate section 12 are fixedly connected.

[0032] To ensure a stable connection between the first intermediate section 11 and the second intermediate section 12, multiple axial grooves are provided on the outer wall of the end where the first intermediate section 11 and the second intermediate section 12 connect. A connecting sleeve 13 is fitted onto the outer wall of the first intermediate section 11 and the second intermediate section 12, and multiple axial transmission teeth 14 are provided on the inner wall of the connecting sleeve 13. Each transmission tooth 14 is located in a groove and is interference-fitted with the groove. The transmission teeth 14 can stably and effectively transmit loads such as torque, ensuring a rigid connection between the first intermediate section 11 and the second intermediate section 12.

[0033] The method for manufacturing the lateral stabilizer bar of the present invention includes: The bar stock is cut into two sections. The bar stock can be made of high-performance spring steel (such as 60Si2MnA), with a yield strength ≥1200MPa and a fatigue life ≥10. 7 Next, according to the designed length, two sections of bar stock are cut to obtain.

[0034] Two sections of bar stock are bent into the first and second halves of the rod. Through hot or cold bending processes, the two sections of bar stock are bent into halves that match the profile of the target stabilizing rod, namely the first and second halves.

[0035] The first half of the rod is machined to the designed dimensions to obtain the first intermediate section 11 and the first connecting section 2. The second half of the rod is machined to the designed dimensions to obtain the second intermediate section 12 and the second connecting section 5. The surfaces of the first and second half of the rod are machined by milling and grinding.

[0036] In machining, a regular polygonal inner hole is machined at the ends of the first intermediate section 11 and the second intermediate section 12. During machining, a base hole is first drilled, the diameter of which is the same as the diameter of the inscribed circle of the regular polygonal inner hole. Then, the excess material is removed by inserting and cutting to obtain the regular polygonal inner hole.

[0037] The mandrel 3 is made of 40CrNiMoA alloy steel, with a hardness of HRC45-50 and wear resistance ≥500HV after heat treatment. The surface is cut to make it into a regular polygonal prism, and first positioning blind holes are machined at both ends of the mandrel 3, and multiple second positioning blind holes are machined on the side wall of the mandrel 3.

[0038] Insert the axial support spring 41 into the first positioning blind hole, insert the radial support spring 42 into the second positioning blind hole, and compress the radial support spring 42 into the second positioning blind hole. Then, insert one end of the mandrel 3 into the first intermediate section 11 and the other end into the second intermediate section 12, and move the first intermediate section 11 and the second intermediate section 12 until the end faces of the first intermediate section 11 and the second intermediate section 12 are in contact.

[0039] Before installing the mandrel 3, the connecting sleeve 13 can be heated to about 200°C and then quickly fitted onto the first intermediate section 11. Then, one end of the mandrel 3 is inserted into the first intermediate section 11, and the connecting sleeve 13 is heated to about 200°C (rapid heating to prevent the first intermediate section 11 from overheating). The inner hole of the second intermediate section 12 is aligned with the mandrel 3, and the second intermediate section 12 is inserted into the connecting sleeve 13 until the end faces of the first intermediate section 11 and the second intermediate section 12 are pressed together.

[0040] The radial support spring 42 needs a certain amount of compression to have sufficient elasticity, ensuring that the mandrel 3 is stably suspended and coaxial with the intermediate section 1. Therefore, the length of the radial support spring 42 when undeformed is greater than the sum of the gap between the mandrel 3 and the intermediate section 1 and the length of the second positioning blind hole. To facilitate the insertion of the mandrel 3 into the first intermediate section 11 and the second intermediate section 12, the radial support spring 42 is preferably positioned within the second positioning blind hole to prevent it from being too long and getting stuck on the end faces of the first intermediate section 11 and the second intermediate section 12. To ensure that the radial support spring 42 is stably positioned within the second positioning blind hole during assembly, after compressing the radial support spring 42 into the second positioning blind hole, a plug is inserted into the opening of the second positioning blind hole. This plug uses a brittle ceramic as the matrix, and a lubricant is added during the sintering process of the matrix. Specifically, the matrix uses alumina powder with an average particle size of 0.5-1 μm, and the lubricant uses molybdenum disulfide powder with an average particle size of 5-10 μm. The alumina powder and molybdenum disulfide powder are mixed in a volume ratio of 7:3 and then molded into sheet-like plugs. The diameter of the plugs is adapted to the second positioning blind hole, and the thickness is 1-2 mm. Then, they are sintered according to conventional processes. After assembly, vibration is applied to the intermediate section 1 at a frequency of 20-50 Hz and an amplitude of 0.5-1 mm for 30-60 seconds, causing the plugs to break. The radial support spring 42 extends and presses against the inner wall of the intermediate section 1. The broken plugs gradually scatter in the gap between the mandrel 3 and the intermediate section 1. When the mandrel 3 contacts and rubs against the intermediate section 1, the plug particles are further crushed, and the lubricant in them provides a lubricating effect, reducing the wear between the mandrel 3 and the intermediate section 1.

[0041] During bending, stress is generated inside the first and second halves of the rod. Therefore, after bending the two sections of the rod, stress-relief annealing is performed on the first and second halves. The specific process involves heating the first and second halves to 550-650°C under a protective atmosphere, holding at that temperature for 1-2 hours, and then cooling them in the furnace. This eliminates the macroscopic residual stress generated during bending, providing dimensionally stable blanks for subsequent precision machining.

[0042] To improve machinability, after the first and second halves of the rod are machined to the designed dimensions, they are heated to the full austenitization temperature (e.g., 860-880°C) and held for at least 2 hours to ensure complete austenitization and avoid residual ferrite, providing a homogeneous parent phase for the subsequent bainite transformation. Then, they are transferred to a salt bath furnace or atmosphere furnace at a temperature 10-30°C below the bainite transformation temperature (e.g., 280-320°C) for isothermal transformation, where carbon atoms slowly precipitate, forming acicular lower bainite. This temperature range avoids the pearlite transformation zone, directly entering the bainite transformation zone and preventing the formation of brittle pearlite. After holding at this temperature for 1-2 hours, they are removed and air-cooled. This heat treatment yields a lower bainite structure, which has moderate hardness (HRC35-40), fine and uniform grains. During cutting, the chips break easily, avoiding tool sticking and built-up edge, and reducing tool wear rate. This provides excellent machinability for subsequent machining of high-precision regular polygonal inner holes.

[0043] The corners of the inner holes in the first intermediate section 11 and the second intermediate section 12 are weak areas. To strengthen these corners, after machining the regular polygonal inner holes, electrodes 6 and insulating sleeves 7 are manufactured. Figure 5 and Figure 6 As shown, the insulating sleeve 7 is fixedly fitted onto the outer wall of the electrode 6, and the insulating sleeve 7 is polygonal in shape. The electrode 6 can be a conventional circular electrode, which can be purchased directly. The insulating sleeve 7 can be made of conventional insulating materials, such as high-purity alumina ceramic, through molding and sintering. Discharge microchannels 71 are provided radially through the edges of the insulating sleeve 7. The width of the discharge microchannels 71 is approximately 1 mm, extending from the inner wall to the outer wall of the insulating sleeve 7, and from one end of the insulating sleeve 7 to the other. The electrode 6 is placed into the inner hole of the polygon, with a 1-2 mm gap between the insulating sleeve 7 and the inner hole. The edges of the insulating sleeve 7 are aligned with the corners of the inner hole of the polygon, and an organic electrolyte containing a penetrating material is injected into the inner hole of the polygon. The penetrating material can be carbon or nitrogen, and the organic electrolyte is a 20%-30% urea aqueous solution. Then, a pulsed high voltage of 10-50kV is applied to electrode 6. Under the high electric field gradient, the discharge is forcibly confined within the discharge microchannel 71. A high-energy, focused micro-plasma beam is excited from the outlet of the discharge microchannel 71, precisely bombarding the six corners of the inner hole. The organic electrolyte at the corners is broken down, and the plasma beam directly bombards and heats the corners of the regular polygonal inner hole. Under plasma drive, the permeating material is injected and diffused into the corners of the regular polygonal inner hole, thereby forming a local reinforcement zone at the corners of the regular polygonal inner hole.

[0044] In this invention, because energy is focused by the discharge microchannel 71, an ultra-high energy density micro-plasma beam is generated at the outlet of the discharge microchannel 71. This not only brings higher instantaneous temperature but also generates a directional, high-kinetic-energy particle stream. This allows the particles to penetrate to higher kinetic energy, diffuse deeper, and produce a finer microstructure, resulting in a stronger bond between the reinforced layer and the substrate. The formed localized reinforced band has a thickness of 50-80 μm and a hardness of HV1000-1200, exhibiting a metallurgical bond with the substrate. Edge wear resistance is improved by more than 50%, and fatigue life is increased by more than 3 times. While reinforcing weak and stress-concentrated edges, most of the planes of the regular polygonal inner hole are not reinforced, maintaining good toughness and serving as a stress buffer to absorb impact.

[0045] When the intermediate section 1 deforms and comes into contact with the mandrel 3, it generates significant friction and load, which can easily lead to wear on both the mandrel 3 and the intermediate section 1. Therefore, this invention provides a wear-resistant coating on the inner wall of the intermediate section 1 and the outer wall of the mandrel 3. After the above-mentioned nitriding or carburizing treatment, the outer wall of the mandrel 3 and the inner walls of the first intermediate section 11 and the second intermediate section 12 are cleaned and activated, and a DLC wear-resistant coating is deposited using a PVD process.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lateral stabilizer bar, characterized in that: It includes an intermediate section (1) and a first connecting section (2) and a second connecting section (5) located at both ends of the intermediate section (1). The intermediate section (1) has a regular polygonal inner hole, and a regular polygonal mandrel (3) is provided in the regular polygonal inner hole. Elastic support members (4) are provided at both ends of the mandrel (3). The mandrel (3) is coaxial with the intermediate section (1), and there is a gap between the outer wall of the mandrel (3) and the inner wall of the intermediate section (1), so that when the intermediate section (1) is subjected to torque and deforms, the outer wall of the mandrel (3) contacts the inner wall of the intermediate section (1) to change the overall torsional stiffness.

2. The lateral stabilizer bar as described in claim 1, characterized in that: The intermediate section (1) includes a first intermediate section (11) and a second intermediate section (12). The first intermediate section (11) is integrally formed with the first connecting section (2), and the second intermediate section (12) is integrally formed with the second connecting section (5). The first connecting section (2) and the second connecting section (5) are solid rods, and the first intermediate section (11) and the second intermediate section (12) are fixedly connected.

3. The lateral stabilizer bar as described in claim 2, characterized in that: The outer wall of the first intermediate section (11) and the second intermediate section (12) is provided with a plurality of axial grooves. The outer wall of the first intermediate section (11) and the second intermediate section (12) is fitted with a connecting sleeve (13). The inner wall of the connecting sleeve (13) is provided with a plurality of axial transmission teeth (14). Each transmission tooth (14) is located in a groove and is interference-fitted with the groove.

4. The lateral stabilizer bar as described in claim 2, characterized in that: The mandrel (3) has first positioning blind holes on both ends and multiple second positioning blind holes on its sidewalls. The elastic support (4) includes an axial support spring (41) and a radial support spring (42). One end of the axial support spring (41) is located in the first positioning blind hole and the other end is pressed against the bottom of the regular polygonal inner hole. One end of the radial support spring (42) is located in the second positioning blind hole and the other end is pressed against the wall of the regular polygonal inner hole.

5. The lateral stabilizer bar as described in claim 4, characterized in that: Preparation methods include: The bar stock is cut into two sections; The two sections of bar stock are bent into the first half of the rod and the second half of the rod. The first half of the rod is machined to the design size to obtain the first intermediate section (11) and the first connecting section (2). The second half of the rod is machined to the design size to obtain the second intermediate section (12) and the second connecting section (5). Regular polygonal inner holes are machined at the ends of the first intermediate section (11) and the second intermediate section (12); Process the mandrel (3), and process the first positioning blind holes at both ends of the mandrel (3), and process multiple second positioning blind holes on the side wall of the mandrel (3); Insert the axial support spring (41) into the first positioning blind hole, insert the radial support spring (42) into the second positioning blind hole, and compress the radial support spring (42) into the second positioning blind hole. Then insert one end of the mandrel (3) into the first intermediate section (11) and the other end into the second intermediate section (12), and move the first intermediate section (11) and the second intermediate section (12) until the end faces of the first intermediate section (11) and the second intermediate section (12) fit together.

6. The lateral stabilizer bar as described in claim 5, characterized in that: After bending the two bar sections into shape, stress-relief annealing is performed on the first and second halves of the bar. After the first and second halves of the rod are machined to the designed dimensions, the first and second halves of the rod are heated to the complete austenitization temperature and held at that temperature for at least 2 hours. Then they are transferred to a salt bath furnace or atmosphere furnace at a temperature 10-30°C below the bainite transformation temperature and held at that temperature for 1-2 hours before being taken out and air-cooled.

7. The lateral stabilizer bar as described in claim 5, characterized in that: After machining the inner hole of the regular polygon, an electrode (6) and an insulating sleeve (7) are manufactured. The insulating sleeve (7) is fixedly sleeved on the outer wall of the electrode (6), and the shape of the insulating sleeve (7) is a regular polygon. A discharge microchannel (71) is provided at the edge of the insulating sleeve (7) and penetrates the insulating sleeve (7) radially. The electrode (6) is placed into the inner hole of the regular polygon, and there is a gap between the insulating sleeve (7) and the inner hole of the regular polygon. An organic electrolyte containing a penetrating material is injected into the inner hole of the regular polygon. Then, a pulsed high voltage of 10-50kV is passed to the electrode (6). Under the electric field gradient, plasma is generated. The plasma beam directly bombards and heats the corner of the inner hole of the regular polygon. The penetrating material is injected and diffused into the corner of the inner hole of the regular polygon under the drive of the plasma, thereby forming a local reinforcement zone at the corner of the inner hole of the regular polygon.

8. The lateral stabilizer bar as described in claim 1, characterized in that: The inner hole of a regular polygon is a regular hexagonal inner hole.

9. The lateral stabilizer bar as described in claim 1, characterized in that: The inner wall of the intermediate section (1) and the outer wall of the core rod (3) are provided with a wear-resistant coating.

10. A suspension system for new energy vehicles, characterized in that: Includes the lateral stabilizer bar as described in any one of claims 1 to 9.

Images