Rear wheel steering system and vehicle

Abstract

The application provides a rear wheel steering system and a vehicle. The rear wheel steering system comprises a shell, a driving mechanism, a screw rod assembly and a power element. The shell is used for being connected with a vehicle body. The driving mechanism is located outside the shell. The driving mechanism comprises a driving element and a linkage assembly. The driving element is connected with the shell. One end of the linkage assembly is in transmission connection with the driving element. The screw rod assembly is arranged in the shell. The screw rod assembly comprises a first screw rod and a second screw rod. The first screw rod is in transmission connection with the other end of the linkage assembly. The first screw rod comprises a first screw rod shaft. The second screw rod comprises a second screw rod shaft. The first screw rod shaft and the second screw rod shaft are fixedly connected together. The driving element is used for driving the linkage assembly to move, so as to drive the first screw rod shaft to move along the axial direction of the screw rod assembly. The power element is arranged in the shell. The power element is connected with the second screw rod. The power element is used for driving the second screw rod shaft to move along the axial direction of the screw rod assembly. The rear wheel steering system has high transmission efficiency.

Description

Technical Field

[0001] This application relates to the field of rear-wheel steering technology, and in particular to a rear-wheel steering system and a vehicle using the rear-wheel steering system. Background Technology

[0002] In the automotive industry, the rear-wheel steering system is a key device for improving vehicle maneuverability and stability, and its internal transmission mechanical structure is the core of ensuring the system's precise operation and steering function, directly affecting the vehicle's performance under different operating conditions.

[0003] In related technologies, rear-wheel steering systems typically use only a single trapezoidal lead screw as the transmission mechanism to meet the self-locking requirements. This structure reduces the turning radius by rotating the rear wheels in the opposite direction when the vehicle is turning at low speeds; and improves vehicle stability by rotating the rear wheels in the same direction when traveling at high speeds. It is a relatively common transmission method currently.

[0004] However, the transmission mechanism in the aforementioned rear-wheel steering system has low transmission efficiency and high friction, resulting in significant energy loss. To meet the steering output thrust requirements, a motor with a larger output power must be selected, which not only increases the system cost but also further exacerbates energy loss. Utility Model Content

[0005] This application provides a rear-wheel steering system and a vehicle, wherein the rear-wheel steering system has low cost and low energy loss.

[0006] On one hand, this application provides a rear-wheel steering system, including a housing, a drive mechanism, a lead screw assembly, and a power component. The housing is used to connect to the vehicle body; the drive mechanism is located outside the housing and includes a drive component and a linkage assembly. The drive component is connected to the housing, and one end of the linkage assembly is drivenly connected to the drive component; the lead screw assembly is disposed inside the housing and includes a first lead screw and a second lead screw. The first lead screw is drivenly connected to the other end of the linkage assembly. The first lead screw includes a first lead screw shaft, and the second lead screw includes a second lead screw shaft. The first lead screw shaft and the second lead screw shaft are fixedly connected together. The drive component is used to drive the linkage assembly to move, thereby causing the first lead screw shaft to move axially along the lead screw assembly; the power component is disposed inside the housing and is connected to the second lead screw. The power component is used to drive the second lead screw shaft to move axially along the lead screw assembly.

[0007] In this way, the first and second lead screws can respectively undertake the functions of output thrust and self-locking, which to some extent avoids the limitations of a single trapezoidal lead screw in transmission efficiency, helps to improve the overall transmission efficiency of the rear-wheel steering system provided in this application, and reduces energy loss caused by friction. At the same time, due to the improvement in transmission efficiency, the steering output thrust requirements can be met without relying on drive components and power components with higher output power, thereby reducing the cost increase caused by selecting high-power drive components, and balancing the stability and economy of the rear-wheel steering system provided in this application.

[0008] As an optional implementation, the first lead screw is a ball screw.

[0009] As an optional implementation, the second lead screw is a trapezoidal lead screw.

[0010] The first lead screw, being a ball screw, boasts high transmission efficiency and low friction, enabling it to efficiently handle the output thrust. This significantly reduces energy loss during transmission, avoiding the energy waste caused by the low efficiency of a single trapezoidal lead screw. The second lead screw, also a trapezoidal lead screw, possesses reliable self-locking performance, meeting the core self-locking requirements of the rear-wheel steering system provided in this embodiment, thus ensuring vehicle safety under various operating conditions.

[0011] As an optional implementation, the first lead screw further includes a first nut, and the second lead screw further includes a second nut; the first nut is disposed at the first end of the first lead screw shaft and is connected to the linkage assembly for transmission, and the second end of the first lead screw shaft is connected to the first end of the second lead screw shaft; the second nut is disposed at the second end of the second lead screw shaft and is connected to the power component.

[0012] The transmission connection between the first nut and the linkage assembly allows the drive component to more precisely move the first nut through the linkage assembly, thereby driving the first lead screw shaft to move efficiently along the axial direction. This fully leverages the high transmission efficiency of the first lead screw as a ball screw, reducing losses during power transmission. Furthermore, the connection between the first and second lead screw shafts ensures coordinated axial movement, guaranteeing continuous power transmission and preventing transmission interruptions or delays.

[0013] As an optional implementation, the driving component is a first drive motor, which has a motor shaft; the linkage assembly includes an output wheel, a synchronous belt, and a pulley; the output wheel is mounted on the motor shaft; one end of the synchronous belt is sleeved on the output wheel; the pulley is connected to a first nut, and the other end of the synchronous belt is sleeved on the pulley.

[0014] The first drive motor serves as the power source, driving the output wheel to rotate via the motor shaft. The power is then transmitted to the pulley via the synchronous belt, thereby driving the first nut to move. This transmission method features smooth transmission and rapid response, allowing the power of the first drive motor to be efficiently applied to the first lead screw. Combined with the support of the first bearing on the first lead screw shaft, it can further reduce the loss in the power transmission process and fully leverage the high-efficiency transmission advantages of the ball screw.

[0015] As an optional implementation, the rear wheel steering system provided in this application further includes a coupling; the power component is a second drive motor, which includes a stator and a rotor; the stator is disposed inside the housing and connected to the inner wall of the housing; the rotor is disposed inside the stator and is connected to the second nut through the coupling.

[0016] As another power source, the stable connection between the stator and the housing of the second drive motor provides a solid foundation for its operation, ensuring that it does not generate unnecessary displacement or vibration during operation. When the rotor rotates within the stator, power is transmitted to the second nut through the coupling. The coupling effectively compensates for any installation deviations and relative displacements between the rotor and the second nut during movement, making power transmission smoother and more reliable, and reducing power loss or impact caused by improper connection.

[0017] As an optional implementation, the rear wheel steering system provided in this application also includes a detection module for detecting the axial position of the lead screw assembly.

[0018] The detection module can monitor the axial position of the lead screw assembly in real time, providing precise position feedback information for the rear-wheel steering system provided in this application. Based on this, the operation of the drive and power components can be adjusted in a timely manner to ensure that the movement of the lead screw assembly meets the vehicle's steering requirements and avoids inaccurate steering due to positional deviations. Simultaneously, this real-time detection works in conjunction with the coordinated transmission of the first and second lead screws. When the lead screw assembly moves within the housing cavity, the feedback from the detection module ensures the accuracy of its motion trajectory, forming a closed-loop control with the power transmission of the linkage components and power components, making the entire steering process smoother and more reliable.

[0019] As an optional implementation, the detection module includes a circuit board and a magnetic ring; the circuit board is disposed on the inner wall of the housing; the magnetic ring is electrically connected to the circuit board and is connected to a coupling.

[0020] The circuit board is fixed to the inner wall of the housing, providing a stable mounting base for the detection module and ensuring that the detection process is not affected by external vibrations or other factors. The magnetic ring is connected to the coupling, which in turn forms a linkage with the second nut, the second lead screw shaft, and the first lead screw shaft. When the lead screw assembly moves axially, the magnetic ring moves synchronously with the coupling. At this time, the circuit board can accurately capture the axial position information of the first and second lead screw shafts by sensing the position change of the magnetic ring.

[0021] As an optional implementation, the rear wheel steering system provided in this application further includes an anti-rotation component, which is disposed between the first lead screw shaft and the housing; the anti-rotation component is used to prevent the first lead screw shaft and the second lead screw shaft from rotating.

[0022] Since the first and second lead screw shafts are welded together as a whole, the anti-rotation component acts on the first lead screw shaft, effectively preventing unnecessary rotation of the first and second lead screw shafts as a whole, ensuring that they only make stable linear motion along the axial direction. This avoids the impact of the rotation of the first lead screw shaft on the transmission efficiency of the first lead screw, and also prevents the rotation of the second lead screw shaft from causing deviations in the self-locking function of the second lead screw, making the coordinated work of the first and second lead screws more reliable.

[0023] As an optional implementation, the anti-rotation component includes an anti-rotation block connected to the first lead screw shaft; an anti-rotation hole is provided on the housing, the anti-rotation block extends into the anti-rotation hole, and the anti-rotation block and the anti-rotation hole slide in axial direction of the lead screw component.

[0024] The connection between the anti-rotation block and the first lead screw shaft allows it to move synchronously with the first lead screw shaft. The structure of the anti-rotation block extending into the anti-rotation hole utilizes the limiting effect of both in the rotation direction to directly prevent the first lead screw shaft from rotating. Furthermore, through the overall linkage of the welded first lead screw shaft and the second lead screw shaft, the rotation of the second lead screw shaft is effectively restricted, ensuring that the first and second lead screw shafts can only move linearly along the axial direction. This avoids the adverse effects of rotation on the transmission efficiency of the first lead screw and the self-locking function of the second lead screw.

[0025] On the other hand, this application also provides a vehicle, including a body and the aforementioned rear-wheel steering system; the housing is connected to the body.

[0026] The vehicle provided in this application has good stability due to the adoption of the aforementioned rear-wheel steering system. Attached Figure Description

[0027] Figure 1 A sectional view of a partial structure of the rear-wheel steering system provided in an embodiment of this application;

[0028] Figure 2 for Figure 1 Enlarged schematic diagram of the local structure at point A;

[0029] Figure 3 for Figure 1 A three-dimensional structural diagram of a partial structure shown;

[0030] Figure 4 for Figure 3 Enlarged schematic diagram of the local structure at point B;

[0031] Figure 5 This is a three-dimensional structural diagram of the housing in the rear wheel steering system provided in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Housing; 2. Drive mechanism; 3. Lead screw assembly; 4. Power component; 5. First bearing; 6. Second bearing; 7. Coupling; 8. Detection module; 9. Anti-rotation component;

[0034] 11. Shell body; 12. Outer edge extension plate; 21. Drive component; 22. Linkage assembly; 31. First lead screw; 32. Second lead screw; 41. Stator; 42. Rotor; 81. Circuit board; 82. Magnetic ring; 91. Anti-rotation block; 10. Spindle;

[0035] 111 Anti-rotation hole; 121 Through hole; 211 Motor shaft; 221 Output wheel; 222 Synchronous belt; 223 Pulley; 311 First lead screw shaft; 312 First nut; 321 Second lead screw shaft; 322 Second nut; 911 Connecting block; 912 Sliding block. Detailed Implementation

[0036] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0037] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0038] In related technologies, rear-wheel steering systems typically use a single trapezoidal lead screw as the transmission mechanism to meet the self-locking requirements. This structure reduces the turning radius by rotating the rear wheels in the opposite direction when the vehicle is turning at low speeds; at high speeds, it improves vehicle stability by rotating the rear wheels in the same direction, making it a common transmission method. However, the transmission mechanism in the aforementioned rear-wheel steering system has low transmission efficiency and high friction, resulting in significant energy loss. To meet the steering output thrust requirements, a motor with higher output power must be selected, which not only increases system cost but also further exacerbates energy loss.

[0039] Based on this, the present application provides a rear wheel steering system and a vehicle. By using a first lead screw and a second lead screw to be fixedly connected together, the rear wheel steering system provided by the present application has a lower cost and less energy loss.

[0040] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0041] Please see Figure 1 , Figure 1 This is a cross-sectional view of a partial structure of the rear wheel steering system provided in an embodiment of this application. This embodiment provides a rear-wheel steering system, including a housing 1, a drive mechanism 2, a lead screw assembly 3, and a power component 4. The housing 1 is used to connect to the vehicle body. The drive mechanism 2 is located outside the housing 1 and includes a drive component 21 and a linkage assembly 22. The drive component 21 is connected to the housing 1, and one end of the linkage assembly 22 is drivenly connected to the drive component 21. The lead screw assembly 3 is disposed inside the housing 1 and includes a first lead screw 31 and a second lead screw 32. The first lead screw 31 is drivenly connected to the other end of the linkage assembly 22. The first lead screw 31 includes a first lead screw shaft 311, and the second lead screw 32 includes a second lead screw shaft 321. The first lead screw shaft and the second lead screw shaft 321 are fixedly connected together. The drive component 21 is used to drive the linkage assembly 22 to move, thereby causing the first lead screw shaft 311 to move along the axial direction of the lead screw assembly 3. The power component 4 is disposed inside the housing 1 and is connected to the second lead screw 32. The power component 4 is used to drive the second lead screw shaft 321 to move along the axial direction of the lead screw assembly 3.

[0042] In this way, the first lead screw 31 and the second lead screw 32 can respectively undertake the functions of output thrust and self-locking, which to a certain extent avoids the limitation of transmission efficiency of a single trapezoidal lead screw, helps to improve the overall transmission efficiency of the rear wheel steering system provided in this embodiment, and reduces energy loss caused by friction. At the same time, due to the improvement in transmission efficiency, it is not necessary to rely on a drive component 21 and a power component 4 with higher output power to meet the steering output thrust requirements, thereby reducing the cost increase caused by the selection of high-power drive components, and balancing the stability and economy of the rear wheel steering system provided in this embodiment.

[0043] In some optional embodiments, the first lead screw 31 is a ball screw, and the second lead screw 32 is a trapezoidal lead screw. The first lead screw 31, as a ball screw, possesses high transmission efficiency and low friction, enabling it to efficiently handle the output thrust, significantly reducing energy loss during transmission and avoiding the energy waste caused by the low efficiency of a single trapezoidal lead screw. The second lead screw 32, as a trapezoidal lead screw, has reliable self-locking performance, meeting the core self-locking requirement of the rear-wheel steering system provided in this embodiment, ensuring vehicle driving safety under various operating conditions.

[0044] Meanwhile, due to the efficient transmission of the first lead screw 31, the steering output thrust requirement can be met without relying on the high-power drive component 21, which effectively reduces the cost of the rear wheel steering system provided in this embodiment. This allows the rear wheel steering system provided in this embodiment to maintain stable operation while also having good economy and energy utilization efficiency.

[0045] A more specific structure for the first lead screw 31 and the second lead screw 32 is as follows: the first lead screw 31 further includes a first nut 312, and the second lead screw 32 further includes a second nut 322; the first nut 312 is disposed at the first end of the first lead screw shaft 311 and is connected to the linkage assembly 22 for transmission; the second end of the first lead screw shaft 311 is connected to the first end of the second lead screw shaft 321; the second nut 322 is disposed at the second end of the second lead screw shaft 321 and is connected to the power component 4.

[0046] The transmission connection between the first nut 312 and the linkage assembly 22 allows the drive component 21 to more precisely drive the first nut 312 through the linkage assembly 22, thereby driving the first lead screw shaft 311 to move efficiently along the axial direction. This fully utilizes the high transmission efficiency advantage of the first lead screw 31 as a ball screw, reducing losses during power transmission. Furthermore, the connection between the first lead screw shaft 311 and the second lead screw shaft 321 ensures coordinated axial movement, guaranteeing the continuity of power transmission and avoiding transmission interruptions or delays.

[0047] Meanwhile, the connection between the second nut 322 and the power component 4, combined with the trapezoidal characteristics of the second lead screw 32, allows the power component 4 to stably drive the second nut 322, thereby moving the second lead screw shaft 321. This ensures the reliable realization of the trapezoidal lead screw's self-locking function and coordinates with the movement of the first lead screw 31, achieving a balance between output thrust and self-locking performance in the rear-wheel steering system provided in this embodiment. This further enhances the stability and precision of the rear-wheel steering system provided in this embodiment.

[0048] It should be noted that in some specific embodiments, the second end of the first lead screw shaft 311 and the first end of the second lead screw shaft 321 are connected together by welding. Specifically, the welding connection enables the first lead screw shaft 311 and the second lead screw shaft 321 to form a stable whole. Compared with other connection methods, this can more reliably ensure the synchronization of the two shafts during axial movement, avoid movement deviation caused by loose connection, and ensure that the efficient transmission of the first lead screw 31 and the self-locking function of the second lead screw 32 form a precise match during operation. At the same time, this stable connection structure can effectively transmit power, reduce power loss at the connection point of the two shafts, and allow the driving force of the drive component 21 and the power component 4 to act more efficiently on the first lead screw shaft 311 and the second lead screw shaft 321, thereby further improving the transmission efficiency of the rear wheel steering system provided in this embodiment.

[0049] Furthermore, the rigid connection formed by welding can enhance the overall structural strength of the lead screw assembly 3, better withstand the axial force and torque generated during steering, reduce the risk of damage to the connection parts due to excessive force, thereby improving the working stability and service life of the rear wheel steering system provided in this embodiment, and providing a strong guarantee for the reliable operation of the rear wheel steering system provided in this embodiment under various working conditions.

[0050] In order to achieve the connection between the first lead screw shaft 311 and the housing 1, and the connection between the second lead screw shaft 321 and the housing 1, the rear wheel steering system provided in this embodiment also includes a first bearing 5 and a second bearing 6. The first lead screw shaft 311 is connected to the housing 1 through the first bearing 5, and the second lead screw shaft 321 is connected to the housing 1 through the second bearing 6.

[0051] The first bearing 5 provides stable support for the first lead screw shaft 311, reducing friction between it and the housing 1 during axial movement. This allows the high-efficiency transmission characteristics of the first lead screw 31 to be fully utilized, preventing a decrease in transmission efficiency due to increased friction. At the same time, this support restricts the radial displacement of the first lead screw shaft 311, ensuring the accuracy of its motion trajectory. Together with the welded first lead screw shaft 311 and the second lead screw shaft 321, it further enhances the synchronization of movement.

[0052] Of course, the support of the second bearing 6 for the second lead screw shaft 321 also reduces friction between it and the housing 1, reduces energy loss, and stabilizes the movement of the second lead screw shaft 321, ensuring the reliability of the second lead screw 32 when realizing the self-locking function. Furthermore, the arrangement of the first bearing 5 and the second bearing 6 together enhances the installation stability of the entire lead screw assembly 3 within the housing 1, better copes with axial forces and torques during steering, and, in conjunction with the rigid connection formed by welding, further improves the working stability and service life of the rear wheel steering system provided in this embodiment.

[0053] The specific structure of the drive mechanism 2 can be as follows: the drive component 21 is a first drive motor, which has a motor shaft 211; the linkage component 22 includes an output wheel 221, a synchronous belt 222 and a pulley 223; the output wheel 221 is mounted on the motor shaft 211; one end of the synchronous belt 222 is sleeved on the output wheel 221; the pulley 223 is connected to the first nut 312, and the other end of the synchronous belt 222 is sleeved on the pulley 223.

[0054] The first drive motor serves as the power source, driving the output wheel 221 to rotate via the motor shaft 211. The power is then transmitted to the pulley 223 via the synchronous belt 222, thereby driving the first nut 312 to move. This transmission method features smooth transmission and rapid response, allowing the power of the first drive motor to be efficiently applied to the first lead screw 31. Combined with the support of the first bearing 5 on the first lead screw shaft 311, this further reduces power loss during transmission and fully leverages the high-efficiency transmission advantages of the ball screw.

[0055] Meanwhile, the synchronous belt 222 transmission can effectively ensure the motion synchronization of the output wheel 221 and the pulley 223, reduce the impact and vibration during the transmission process, and make the motion of the first nut 312 driving the first lead screw shaft 311 more precise and stable. Together with the supporting role of the welded first lead screw shaft 311, the second lead screw shaft 321, the first bearing 5, and the second bearing 6, it further improves the coordination of the motion of the rear wheel steering system provided in this embodiment, and provides a strong guarantee for the reliable operation of the rear wheel steering system.

[0056] Furthermore, the rear wheel steering system provided in this embodiment also includes a coupling 7; the power component 4 is a second drive motor, which includes a stator 41 and a rotor 42; the stator 41 is disposed inside the housing 1 and connected to the inner wall of the housing 1; the rotor 42 is disposed inside the stator 41, and the rotor 42 is connected to the second nut 322 through the coupling 7.

[0057] In other words, the stable connection between the stator 41 and the housing 1 provides a solid foundation for the operation of the second drive motor, ensuring that it will not generate unnecessary displacement or vibration during operation. When the rotor 42 rotates within the stator 41, it transmits power to the second nut 322 through the coupling 7. The coupling 7 can effectively compensate for possible installation deviations and relative displacements during movement between the rotor 42 and the second nut 322, making power transmission smoother and more reliable, and reducing power loss or impact caused by improper connection.

[0058] Meanwhile, the precise connection between the second drive motor and the second lead screw 32 ensures the timely response and reliability of the trapezoidal lead screw when realizing the self-locking function, complementing the efficient transmission of the first lead screw 31, further improving the operational stability and working efficiency of the rear wheel steering system provided in this embodiment, and also adding assurance for the reliable operation of the rear wheel steering system provided in this embodiment under complex working conditions.

[0059] In order to achieve the connection between the lead screw assembly 3 and the housing 1, and the connection between the drive member 21 and the housing 1, in some specific embodiments, the housing 1 includes a housing body 11 and an outer edge extension plate 12 connected to the end of the housing body 11. The first lead screw 31 and the second lead screw 32 are both disposed in the inner cavity of the housing body 11. The drive member 21 is connected to the outer edge extension plate 12, and the outer edge extension plate 12 has a through hole 121 through which the motor shaft 211 passes. The linkage assembly 22 and the drive member 21 are distributed on opposite sides of the outer edge extension plate 12.

[0060] The housing 11 provides a stable mounting space for the first lead screw 31 and the second lead screw 32, effectively protecting them and reducing interference from the external environment. The outer extension plate 12 not only provides a stable mounting carrier for the drive component 21, but its through-hole 121 also ensures smooth connection between the motor shaft 211 and the linkage assembly 22, enabling efficient transmission of power from the drive component 21 to the first lead screw 31. The arrangement of the linkage assembly 22 and the drive component 21 on opposite sides of the outer extension plate 12 avoids mutual interference between components, making the rear-wheel steering system provided in this embodiment more compact and facilitating future maintenance and repair.

[0061] Please continue to combine Figure 2 , Figure 2 for Figure 1 A magnified schematic diagram of the partial structure at point A. In order to obtain the axial position of the lead screw assembly 3, the rear wheel steering system provided in this embodiment also includes a detection module 8, which is used to detect the axial position of the lead screw assembly 3.

[0062] The detection module 8 can monitor the axial position of the lead screw assembly 3 in real time, providing accurate position feedback information for the rear wheel steering system provided in this embodiment. Based on this, the operation of the drive component 21 and the power component 4 can be adjusted in a timely manner to ensure that the movement of the lead screw assembly 3 meets the vehicle steering requirements and avoids inaccurate steering due to position deviation. At the same time, this real-time detection can correspond to the coordinated transmission of the first lead screw 31 and the second lead screw 32. When the lead screw assembly 3 moves in the inner cavity of the housing body 11, the feedback from the detection module 8 can ensure the accuracy of its movement trajectory, forming a closed-loop control with the power transmission of the linkage component 22 and the power component 4, making the entire steering process smoother and more reliable.

[0063] In addition, the detection module 8 can detect abnormalities in the movement of the lead screw assembly 3 in a timely manner, which facilitates the system to respond promptly, reduces the possibility of failure, further extends the service life of the rear wheel steering system provided in this embodiment, and better leverages the advantages of the rear wheel steering system provided in this embodiment in improving vehicle driving flexibility and stability.

[0064] In some specific embodiments, the detection module 8 includes a circuit board 81 and a magnetic ring 82. The circuit board 81 is disposed on the inner wall of the housing body 11. The magnetic ring 82 is electrically connected to the circuit board 81 and is connected to the coupling 7. The circuit board 81, fixed to the inner wall of the housing body 11, provides a stable mounting base for the detection module 8, ensuring that the detection process is not interfered with by external vibrations or other factors. The magnetic ring 82 is connected to the coupling 7, which in turn forms a linkage with the second nut 322, the second lead screw shaft 321, and the first lead screw shaft 311. When the lead screw assembly 3 moves axially, the magnetic ring 82 moves synchronously with the coupling 7. At this time, the circuit board 81 can accurately capture the axial position information of the first lead screw shaft 311 and the second lead screw shaft 321 by sensing the position change of the magnetic ring 82.

[0065] This allows the detection module 8 to more directly reflect the motion state of the lead screw assembly 3. Compared with indirect detection methods, it reduces the delay and error in the signal transmission process, making the feedback information more accurate and timely.

[0066] Please continue to combine Figures 3 to 5 , Figure 3 for Figure 1 A three-dimensional structural diagram of a partial structure shown. Figure 4 for Figure 3 A magnified view of the local structure at point B. Figure 5 This is a three-dimensional structural diagram of the housing in the rear wheel steering system provided in this embodiment. To prevent the lead screw assembly 3 from rotating, the rear wheel steering system provided in this embodiment also includes an anti-rotation component 9, which is disposed between the first lead screw shaft 311 and the housing 1; the anti-rotation component 9 is used to prevent the first lead screw shaft 311 and the second lead screw shaft 321 from rotating.

[0067] Since the first lead screw shaft 311 and the second lead screw shaft 321 are welded together as a whole, the anti-rotation component 9 acts on the first lead screw shaft 311, effectively preventing unnecessary rotation of the first lead screw shaft 311 and the second lead screw shaft 321 as a whole, ensuring that they only make stable linear movements along the axial direction. This avoids the impact of the rotation of the first lead screw shaft 311 on the transmission efficiency of the first lead screw 31, and also prevents the rotation of the second lead screw shaft 321 from causing deviations in the self-locking function of the second lead screw 32, making the coordinated work of the first lead screw 31 and the second lead screw 32 more reliable.

[0068] Meanwhile, the stable linear motion of the first lead screw shaft 311 and the second lead screw shaft 321 makes the magnetic ring 82 move more smoothly with the coupling 7, reducing the position fluctuation of the magnetic ring 82 caused by the rotation of the first lead screw shaft 311 and the second lead screw shaft 321, allowing the circuit board 81 to more accurately sense the position change of the magnetic ring 82 and improve the accuracy of the feedback information from the detection module 8.

[0069] like Figure 4 and Figure 5 As shown, in some optional embodiments, the anti-rotation component 9 includes an anti-rotation block 91 connected to the first lead screw shaft 311; an anti-rotation hole 111 is provided on the housing body 11, the anti-rotation block 91 extends into the anti-rotation hole 111, and the anti-rotation block 91 and the anti-rotation hole 111 slide in axial direction of the lead screw component 3.

[0070] The connection between the anti-rotation block 91 and the first lead screw shaft 311 allows it to move synchronously with the first lead screw shaft 311. The structure of the anti-rotation block 91 extending into the anti-rotation hole 111 utilizes the limiting effect of the two in the rotation direction to directly prevent the first lead screw shaft 311 from rotating. Furthermore, through the overall linkage of the welded connection between the first lead screw shaft 311 and the second lead screw shaft 321, the rotation of the second lead screw shaft 321 is effectively restricted, ensuring that the first lead screw shaft 311 and the second lead screw shaft 321 can only move linearly along the axial direction. This avoids the adverse effects of rotation on the transmission efficiency of the first lead screw 31 and the self-locking function of the second lead screw 32.

[0071] Meanwhile, the axial sliding fit between the anti-rotation block 91 and the anti-rotation hole 111 does not affect the normal axial movement of the first lead screw shaft 311 and the second lead screw shaft 321, and can continuously play an anti-rotation role during the movement, ensuring the stability of the linear movement of the first lead screw shaft 311 and the second lead screw shaft 321. This stable movement state makes the magnetic ring 82 move more smoothly with the coupling 7, which helps the circuit board 81 to accurately sense the position change of the magnetic ring 82, improves the accuracy of the feedback information from the detection module 8, and cooperates with the drive component 21 and the power component 4 to make the operation of the rear wheel steering system provided in this embodiment more stable and precise.

[0072] In a specific embodiment of this example, the anti-rotation block 91 includes a connecting block 911 and a sliding block 912 connected together. The connecting block 911 is connected to the first lead screw shaft 311, and the sliding block 912 extends into the anti-rotation hole 111 and slides in axial direction with the anti-rotation hole 111.

[0073] Specifically, the connection between the connecting block 911 and the first lead screw shaft 311 provides a reliable transition for the linkage between the sliding block 912 and the first lead screw shaft 311, ensuring that the sliding block 912 moves synchronously with the first lead screw shaft 311 and avoiding failure of the anti-rotation function due to unstable connection. The sliding block 912 extends into the anti-rotation hole 111 and forms a sliding fit, allowing for a closer fit in the rotation direction limit, further enhancing the anti-rotation effect on the first lead screw shaft 311. Furthermore, through the welded linkage between the first lead screw shaft 311 and the second lead screw shaft 321, the rotation of the second lead screw shaft 321 is more effectively restricted, ensuring that the first lead screw shaft 311 and the second lead screw shaft 321 only move linearly along the axial direction, reducing interference from rotation on the transmission efficiency of the first lead screw 31 and the self-locking function of the second lead screw 32.

[0074] Meanwhile, the targeted sliding fit between the sliding block 912 and the anti-rotation hole 111 reduces the frictional resistance during axial movement, ensuring smooth axial movement of the first lead screw shaft 311 and the second lead screw shaft 321 while continuously and stably providing anti-rotation protection, making the linear movement of the first lead screw shaft 311 and the second lead screw shaft 321 smoother. This smoothness makes the movement of the magnetic ring 82 more regular with the coupling 7, which is beneficial for the circuit board 81 to more accurately sense changes in the position of the magnetic ring 82 and improve the reliability of the feedback information from the detection module 8.

[0075] It should be noted that the rear wheel steering system provided in this embodiment also includes a main shaft 10, and the first end of the first lead screw shaft 311 and the second end of the second lead screw shaft 321 are both connected to the main shaft 10. Of course, the rear wheel steering system provided in this embodiment may also include other modules or components that enable the rear wheel steering system to work normally, and no specific limitations are made here.

[0076] This embodiment also provides a vehicle, including a body and the aforementioned rear-wheel steering system; the housing 1 is connected to the body. The housing 1 and the body can be detachably connected to facilitate assembly of the rear-wheel steering system, etc.

[0077] It should be noted that the structure of the rear-wheel steering system has been described in detail in the above embodiments and will not be repeated here. The vehicle provided in this embodiment should also include other modules or components that enable the vehicle to drive normally, which will not be described in detail here.

[0078] The vehicle provided in this embodiment improves its stability by adopting the aforementioned rear-wheel steering system.

[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A rear-wheel steering system, characterized in that, include: The housing is used for connection to the vehicle body; A drive mechanism is located outside the housing. The drive mechanism includes a drive component and a linkage assembly. The drive component is connected to the housing, and one end of the linkage assembly is connected to the drive component in a transmission manner. A lead screw assembly is disposed within the housing. The lead screw assembly includes a first lead screw and a second lead screw. The first lead screw is connected to the other end of the linkage assembly. The first lead screw includes a first lead screw shaft, and the second lead screw includes a second lead screw shaft. The first lead screw shaft and the second lead screw shaft are fixedly connected together. The driving member is used to drive the linkage assembly to move, thereby causing the first lead screw shaft to move along the axial direction of the lead screw assembly. as well as A power component is disposed within the housing and is connected to the second lead screw. The power component is used to drive the second lead screw shaft to move axially along the lead screw assembly.

2. The rear-wheel steering system according to claim 1, characterized in that, The first lead screw is a ball screw; and / or, The second lead screw is a trapezoidal lead screw.

3. The rear-wheel steering system according to claim 2, characterized in that, The first lead screw further includes a first nut, and the second lead screw further includes a second nut; The first nut is disposed at the first end of the first lead screw shaft, and the first nut is connected to the linkage assembly in a transmission manner; the second end of the first lead screw shaft is connected to the first end of the second lead screw shaft. The second nut is located at the second end of the second lead screw shaft and is connected to the power component.

4. The rear-wheel steering system according to claim 3, characterized in that, The driving component is a first driving motor, and the first driving motor has a motor shaft; The linkage component includes: The output wheel is mounted on the motor shaft; A timing belt, one end of which is fitted onto the output pulley; and A pulley is connected to the first nut, and the other end of the timing belt is sleeved on the pulley.

5. The rear-wheel steering system according to claim 3, characterized in that, It also includes couplings; The power component is a second drive motor, which includes: The stator is disposed within the housing and connected to the inner wall of the housing; The rotor is disposed within the stator, and the rotor is connected to the second nut via the coupling.

6. The rear-wheel steering system according to claim 5, characterized in that, It also includes a detection module, which is used to detect the axial position of the lead screw assembly.

7. The rear-wheel steering system according to claim 6, characterized in that, The detection module includes: A circuit board is disposed on the inner wall of the housing; and A magnetic ring is electrically connected to the circuit board and is also connected to the coupling.

8. The rear-wheel steering system according to any one of claims 1 to 7, characterized in that, It also includes an anti-rotation component, which is disposed between the first lead screw shaft and the housing; The anti-rotation component is used to prevent the first lead screw shaft and the second lead screw shaft from rotating.

9. The rear-wheel steering system according to claim 8, characterized in that, The anti-rotation component includes an anti-rotation block, which is connected to the first lead screw shaft; The housing has an anti-rotation hole, the anti-rotation block extends into the anti-rotation hole, and the anti-rotation block and the anti-rotation hole slide in axial direction of the lead screw assembly.

10. A vehicle, characterized in that, Includes the vehicle body and the rear-wheel steering system as described in any one of claims 1 to 9; The housing is connected to the vehicle body.

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