Rotary limiting mechanism, steering system and vehicle

Abstract

The utility model discloses a rotation limiting mechanism, a steering system and a vehicle. The rotation limiting mechanism comprises a steering column. The lead screw comprises a threaded section and a spline section, the spline section is connected to the threaded section, and the spline section is used for being matched with the steering shaft; the nut is matched with the threaded section, and a first limiting part and a second limiting part are arranged at the two opposite ends of the nut; the first limiting piece is arranged at the end, away from the spline section, of the threaded section, and when the nut is located at the first position relative to the lead screw, the first limiting piece and the first limiting part are in limiting fit in the circumferential direction of the lead screw; and the second limiting piece is arranged on the spline section, and when the nut is located at the second position relative to the lead screw, the second limiting piece and the second limiting part are in limiting fit in the circumferential direction of the lead screw. Therefore, by arranging the rotation limiting mechanism, the number of rotation turns of the steering shaft can be limited, so that the protection effect on the angle sensor and the clock spring is achieved, and the rotation limiting mechanism is simple and reliable in structure, low in cost and small in size.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a rotation limiting mechanism, a steering system and a vehicle. Background Art

[0002] With the development of steering technology, the steering system has developed in the direction of mechanical steering, hydraulic steering, electro-hydraulic, electric power steering, and steer-by-wire.

[0003] In related technologies, compared with other steering methods, the steer-by-wire cancels the intermediate shaft. Only electrical signals are transmitted between the steering column and the steer-by-wire steering gear to achieve information interaction between the upper and lower structures. There are many physical buttons on the steering wheel of the whole vehicle. Currently, a clock spring needs to be added between the steering column and the steering wheel to solve the power supply and communication requirements. However, the clock spring has a limit on the number of turns. After exceeding the number of turns, the clock spring will be damaged, resulting in the failure of the steering wheel buttons. Moreover, the angle sensor also has requirements for the angle range limit. Therefore, the steering column cannot rotate arbitrarily. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to propose a rotation limiting mechanism, which can limit the number of turns of the steering shaft, so as to achieve the protection effect on the angle sensor and the clock spring.

[0005] The utility model further proposes a steering system.

[0006] The utility model further proposes a vehicle.

[0007] According to the rotation limiting mechanism of the first aspect of the utility model, it includes: a steering column; a lead screw, the lead screw is located inside the steering column, the lead screw includes: a threaded section and a spline section, the spline section is connected to the threaded section, and the spline section is used to cooperate with the steering shaft; a nut, the nut is arranged inside the steering column, the nut is circumferentially limited and cooperated with the steering column, the nut is cooperated with the threaded section, and the relative two ends of the nut are provided with a first limiting part and a second limiting part; a first limiting member, the first limiting member is arranged at the end of the threaded section far away from the spline section, when the nut is in a first position relative to the lead screw, the first limiting member and the first limiting part are circumferentially limited and cooperated on the lead screw; a second limiting member, the second limiting member is arranged on the spline section, when the nut is in a second position relative to the lead screw, the second limiting member and the second limiting part are circumferentially limited and cooperated on the lead screw.

[0008] In the above technical solution, when the nut is fixed to the pipe column (restricting its rotation) and the steering wheel rotates (it can rotate forward), the steering wheel will control the rotation of the steering shaft. The steering shaft drives the lead screw to rotate through the spline section. The threaded section on the lead screw rotates relative to the nut. Since the nut is circumferentially fixed, the lead screw converts its rotational motion relative to the nut into an axial linear motion. And when the nut is in the first position relative to the lead screw, at this time, the first limiting member and the first limiting portion on the nut establish a circumferential limiting cooperation relationship, that is, the first limiting portion on the nut restricts the first limiting member from continuing to rotate with the lead screw, thereby restricting the lead screw from continuing to perform axial linear motion toward the side of its spline section. For another example, when the nut is fixed to the pipe column (restricting its rotation) and the steering wheel rotates (it can rotate backward), the steering wheel will control the rotation of the steering shaft. The steering shaft drives the lead screw to rotate through the spline section. The threaded section on the lead screw rotates relative to the nut. Since the nut is circumferentially fixed, the lead screw converts its rotational motion relative to the nut into an axial linear motion. And when the nut is in the second position relative to the lead screw, at this time, the second limiting member and the second limiting portion on the nut establish a circumferential limiting cooperation relationship, that is, the second limiting portion on the nut restricts the second limiting member from continuing to rotate with the lead screw, thereby restricting the lead screw from continuing to perform axial linear motion away from the side of its spline section. In summary, the first position and the second position jointly define the limit positions where the lead screw can perform axial linear motion relative to the nut. Thus, the final set number of steering wheel limit turns can be determined by the pitch and the axial distance between the first position and the second position, and further the protection effect on the angle sensor and the clock spring can be achieved (for example, in a steer-by-wire system, compared with other steering systems, its layout form without an intermediate shaft enables only the transmission of electrical signals between the steering shaft and the steer-by-wire steering gear to achieve up and down information interaction. There are many physical buttons on the steering wheel in the whole vehicle, and a clock spring is set between the steering wheel and the pipe column to solve the power supply and communication requirements. However, the clock spring has a limit on the number of turns. After exceeding the number of turns, the clock spring will be damaged, resulting in the failure of the steering wheel buttons. Moreover, the angle sensor also has a limit requirement on the angle range. Therefore, the steering shaft cannot rotate arbitrarily. And the embodiment in this case can effectively solve the problem of the number of turns limit of the steering shaft and achieve the protection effect on the angle sensor and the clock spring). In addition, the rotation limiting mechanism has a simple and reliable structure, low cost, and small volume, effectively improving its practicability.

[0009] Thus, by setting this rotation limiting mechanism, it can limit the number of turns of the steering shaft, thereby achieving the protection effect on the angle sensor and the clock spring, and it has a simple and reliable structure, low cost, and small volume.

[0010] In some examples of the present utility model, the first limiting member includes: an end plate disposed at one end of the threaded section away from the spline section; a third limiting portion connected to the edge of the end plate and protruding towards the nut. When the nut is in a first position relative to the lead screw, the third limiting portion and the first limiting portion are in circumferential limiting cooperation on the lead screw.

[0011] In some examples of the present utility model, a transition arc is provided at the connection between the end plate and the third limiting portion.

[0012] In some examples of the present utility model, the end plate is provided with a first mounting hole, and the end face of the lead screw facing the first limiting member is provided with a second mounting hole. The first mounting hole and the second mounting hole are oppositely arranged and connected by fasteners.

[0013] In some examples of the present utility model, the second limiting member includes: a collar sleeved on the spline section; a fourth limiting portion provided at the edge of the collar and protruding towards the nut. When the nut is in a second position relative to the lead screw, the fourth limiting portion and the second limiting portion are in circumferential limiting cooperation on the lead screw.

[0014] In some examples of the present utility model, a transition arc is provided at the connection between the collar and the fourth limiting portion.

[0015] In some examples of the present utility model, the spline section is provided with a first external spline, and the collar is provided with an internal spline, and the first external spline cooperates with the internal spline; and / or a positioning groove is provided on one side of the collar facing the threaded section, and the end of the threaded section facing the collar extends into the positioning groove.

[0016] In some examples of the present utility model, the outer peripheral surface of the nut is provided with a second external spline.

[0017] The steering system according to the second aspect of the present utility model includes: the above-mentioned rotation limiting mechanism.

[0018] The vehicle according to the third aspect of the present utility model includes: the above-mentioned steering system.

[0019] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 is the front view of the rotation limiting mechanism according to an embodiment of the present invention;

[0022] Figure 2 is the exploded view of the rotation limiting mechanism according to an embodiment of the present invention;

[0023] Figure 3 is the structural schematic diagram of the lead screw according to an embodiment of the present invention;

[0024] Figure 4 is the structural schematic diagram of the nut according to an embodiment of the present invention;

[0025] Figure 5 is the structural schematic diagram of the first limiting member according to an embodiment of the present invention;

[0026] Figure 6 is the structural schematic diagram of the second limiting member according to an embodiment of the present invention.

[0027] Reference signs:

[0028] 100, rotation limiting mechanism; 200, steering shaft;

[0029] 1, lead screw; 11, threaded section; 12, spline section; 121, first external spline; 13, second mounting hole;

[0030] 2, nut; 21, first limiting portion; 22, second limiting portion; 23, second external spline;

[0031] 3, first limiting member; 31, end plate; 311, first mounting hole; 32, third limiting portion; 33, first transition arc;

[0032] 4, second limiting member; 41, collar; 411, internal spline; 412, positioning groove; 42, fourth limiting portion; 43, second transition arc;

[0033] 5, fastener. Detailed implementation manners

[0034] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the drawings are exemplary.

[0035] Next, refer to Figures 1 - 6 to describe the rotation limiting mechanism 100 according to an embodiment of the present invention, which can limit the number of rotation turns of the steering shaft 200, thereby achieving the protection effect on the angle sensor and the clock spring.

[0036] Combined with Figures 1 - 6As shown in the figure, the rotation limiting mechanism 100 according to the first aspect of the present utility model includes a steering column, a lead screw 1, a nut 2, a first limiting member 3 and a second limiting member 4. Among them, the first limiting member 3 and the second limiting member 4 can play a role in restricting the movement of the lead screw 1 or the nut 2, and the lead screw 1 and the nut 2 can be in transmission cooperation, mainly used to convert rotational motion into linear motion, or vice versa. For example, the lead screw 1 is usually constructed as a cylindrical metal rod with threads, and there is one or more threads extending axially on its outer peripheral surface. The nut 2 is a part used in cooperation with the lead screw 1. When the lead screw 1 rotates, the nut 2 can move along the axial direction of the lead screw 1, and when the nut 2 rotates, the lead screw 1 can move along the axial direction of the nut 2, that is, the rotational motion of the lead screw 1 is converted into linear motion through the cooperating nut 2, or the linear motion of the nut 2 drives the lead screw 1 to rotate, realizing the transmission of force and motion.

[0037] Specifically, the lead screw 1 is located inside the steering column. The lead screw 1 includes a threaded section 11 and a spline section 12. The spline section 12 is connected to the threaded section 11. The spline section 12 is used to cooperate with the steering shaft 200. The nut 2 is arranged inside the steering column. The nut 2 is circumferentially limited and cooperates with the steering column. The nut 2 cooperates with the threaded section 11. The relative two ends of the nut 2 are provided with a first limiting portion 21 and a second limiting portion 22. The first limiting member 3 is arranged at one end of the threaded section 11 away from the spline section 12. When the nut 2 is in the first position relative to the lead screw 1, the first limiting member 3 and the first limiting portion 21 are circumferentially limited and cooperate on the lead screw 1. The second limiting member 4 is arranged on the spline section 12. When the nut 2 is in the second position relative to the lead screw 1, the second limiting member 4 and the second limiting portion 22 are circumferentially limited and cooperate on the lead screw 1.

[0038] Specifically, a threaded section 11 and a spline section 12 are formed axially on the outer periphery of the lead screw 1. The threaded section 11 can be matched with the internal threads of the nut 2 to ensure tight meshing between the two. The spline section 12 establishes a transmission cooperation relationship with the internal splines on the inner wall of the steering shaft 200. In this way, the steering shaft 200 can smoothly transmit torque and power to the lead screw 1. Moreover, compared with key connections with a single contact surface such as flat keys, the characteristic of spline fitting is multi-tooth contact, which can provide greater load-bearing capacity, higher coaxiality and smoother operation, thus ensuring the stability and accuracy of transmission.

[0039] Further, along the axial direction of the lead screw 1, first limiting portions 21 and second limiting portions 22 are respectively formed at opposite ends of the nut 2. The first limiting member 3, the nut 2, and the second limiting member 4 are sequentially arranged on the lead screw 1 along the axial direction of the lead screw 1 and in the direction close to the spline section 12, that is, the first limiting member 3 is fixedly connected to the axial end of the threaded section 11 of the lead screw 1 away from the spline section 12, and the second limiting member 4 is fixedly connected to the axial end of the spline section 12 of the lead screw 1 away from the threaded section 11. The nut 2 is movably connected to the lead screw 1, so that an adjustment interval for the axial linear movement of the lead screw 1 relative to the nut 2 can be defined between the first limiting member 3 and the second limiting member 4.

[0040] For example, when the nut 2 is fixed to the steering column (restricting its circumferential rotation), and the steering wheel rotates (which can be a forward rotation), the steering wheel will control the rotation of the steering shaft 200. The steering shaft 200 drives the lead screw 1 to rotate through the spline section 12. The threaded section 11 on the lead screw 1 rotates relative to the nut 2. Since the nut 2 is circumferentially fixed, the lead screw 1 converts its rotational movement relative to the nut 2 into an axial linear movement. And when the nut 2 is in the first position relative to the lead screw 1, at this time, a circumferential limiting and mating relationship is established between the first limiting member 3 and the first limiting portion 21 on the nut 2, that is, the first limiting portion 21 on the nut 2 restricts the first limiting member 3 from continuing to rotate with the lead screw 1, thereby restricting the lead screw 1 from continuing to perform axial linear movement toward the side of its spline section 12.

[0041] Again, for example, when the nut 2 is fixed to the steering column (restricting its circumferential rotation), and the steering wheel rotates (which can be a reverse rotation), the steering wheel will control the rotation of the steering shaft 200. The steering shaft 200 drives the lead screw 1 to rotate through the spline section 12. The threaded section 11 on the lead screw 1 rotates relative to the nut 2. Since the nut 2 is circumferentially fixed, the lead screw 1 converts its rotational movement relative to the nut 2 into an axial linear movement. And when the nut 2 is in the second position relative to the lead screw 1, at this time, a circumferential limiting and mating relationship is established between the second limiting member 4 and the second limiting portion 22 on the nut 2, that is, the second limiting portion 22 on the nut 2 restricts the second limiting member 4 from continuing to rotate with the lead screw 1, thereby restricting the lead screw 1 from continuing to perform axial linear movement away from the side of its spline section 12.

[0042] In summary, the first position and the second position jointly define the limit positions where the lead screw 1 can perform axial linear motion relative to the nut 2. Thus, the finally set number of steering wheel limit turns can be determined based on the pitch and the axial distance between the first position and the second position, thereby achieving the protection effect on the angle sensor and the clock spring (for example, in a steer-by-wire system, compared with other steering systems, its layout form without an intermediate shaft enables only electrical signal transmission between the steering shaft and the steer-by-wire steering gear to achieve up and down information interaction. There are many physical buttons on the steering wheel in the whole vehicle, and a clock spring is arranged between the steering wheel and the column to solve the power supply and communication requirements. However, the clock spring has a limit on the number of turns. After exceeding the number of turns, the clock spring will be damaged, resulting in the failure of the steering wheel buttons. Moreover, the angle sensor also has a limit on the angle range requirement. Therefore, the steering shaft cannot rotate arbitrarily. The embodiments in this case can effectively solve the problem of the number of turns limit of the steering shaft 200 and achieve the protection effect on the angle sensor and the clock spring). In addition, the rotation limiting mechanism 100 has a simple and reliable structure, low cost, and small volume, effectively improving its practicability.

[0043] Thus, by providing the rotation limiting mechanism 100, it can limit the number of turns of the steering shaft 200, thereby achieving the protection effect on the angle sensor and the clock spring, and it has a simple and reliable structure, low cost, and small volume.

[0044] According to some alternative embodiments of the present invention, in combination with Figures 3 - 5 As shown, the first limiting member 3 includes an end plate 31 and a third limiting portion 32. The end plate 31 is disposed at one end of the threaded section 11 away from the spline section 12. The third limiting portion 32 is connected to the edge of the end plate 31, and the third limiting portion 32 protrudes towards the nut 2. When the nut 2 is in the first position relative to the lead screw 1, the third limiting portion 32 and the first limiting portion 21 are in circumferential limiting cooperation on the circumference of the lead screw 1.

[0045] Specifically, the end plate 31 of the first limiting member 3 is axially connected to one end of the threaded section 11 away from the spline section 12. The end plate 31 can increase the contact area between the first limiting member 3 and the lead screw 1, thereby facilitating its stable connection to the lead screw 1. The third limiting portion 32 is bent and connected to the circumferential outer edge of the end plate 31, and the third limiting portion 32 protrudes towards the nut 2. As the lead screw 1 performs circumferential linear motion relative to the nut 2, when the nut 2 is in the first position relative to the lead screw 1, the third limiting portion 32 on the nut 2 and the first limiting portion 21 are in circumferential limiting cooperation. At this time, the lead screw 1 will no longer be able to continue rotating along the original rotation trend (that is, the limit position where the lead screw 1 moves axially towards the spline section 12 side), thereby achieving the effect of limiting the number of turns of the lead screw 1 in a certain direction (for example, one of clockwise or counterclockwise), and further playing a role in protecting the angle sensor and the clock spring.

[0046] Specifically, as shown in Figure 5 , a first transition arc 33 is provided at the connection between the end plate 31 and the third limiting portion 32. It can be understood that the first transition arc 33 can make the force at the connection between the end plate 31 and the third limiting portion 32 more uniform, thereby avoiding the problem of material damage and fracture caused by stress concentration here, and further improving the structural stability and durability of the first limiting member 3.

[0047] Furthermore, as shown in Figure 5 , the end plate 31 is provided with a first mounting hole 311, and the end face of the lead screw 1 facing the first limiting member 3 (that is, the side of the lead screw 1 away from the spline section 12) is provided with a second mounting hole 13. The first mounting hole 311 and the second mounting hole 13 are arranged opposite to each other, and the first mounting hole 311 and the second mounting hole 13 are connected by a fastener 5. That is to say, the fastener 5 sequentially passes through the first mounting hole 311 on the end plate 31 and the second mounting hole 13 on the end face of the lead screw 1 away from the spline section 12 along the axial direction to firmly fix the first limiting member 3 on the lead screw 1, so as to improve the connection firmness and disassembly convenience between the two.

[0048] According to some alternative embodiments of the present invention, as shown in Figure 3 , Figure 4 and Figure 6 , the second limiting member 4 includes a collar 41 and a fourth limiting portion 42. The collar 41 is sleeved on the spline section 12, and the fourth limiting portion 42 is arranged at the edge of the collar 41, and the fourth limiting portion 42 protrudes towards the nut 2. When the nut 2 is in the second position relative to the lead screw 1, the fourth limiting portion 42 and the second limiting portion 22 are in circumferential limiting cooperation on the lead screw 1.

[0049] Among them, the collar 41 of the second limiting member 4 is sleeved on the spline section 12, and the second limiting member 4 and the spline section 12 are circumferentially relatively fixed, so as to ensure a tight connection between the second limiting member 4 and the lead screw 1. The fourth limiting portion 42 is bent and connected to the outer circumferential edge of the collar 41, and the fourth limiting portion 42 protrudes towards the nut 2. As the lead screw 1 moves linearly axially relative to the nut 2, when the nut 2 is in the second position relative to the lead screw 1, the second limiting portion 22 on the nut 2 and the fourth limiting portion 42 are in circumferential limiting cooperation. At this time, the lead screw 1 cannot continue to rotate along the original rotation trend (that is, the limit position where the lead screw 1 moves axially away from the spline section 12), thereby realizing the effect of restricting the number of turns that the lead screw 1 can rotate in a certain direction (for example, the other of clockwise or counterclockwise), and further playing a role in protecting the angle sensor and the clock spring.

[0050] Specifically, as shown in Figure 6As shown, a second transition arc 43 is provided at the connection between the collar 41 and the fourth limiting portion 42. It can be understood that the second transition arc 43 can make the force at the connection between the collar 41 and the fourth limiting portion 42 more uniform, thus avoiding the problem of material damage and fracture caused by stress concentration here, and further improving the structural stability and durability of the second limiting member 4.

[0051] Furthermore, as shown in Figure 3 a first external spline 121 is provided on the spline section 12, and an internal spline 411 is provided on the collar 41, and the first external spline 121 cooperates with the internal spline 411. That is to say, the first external spline 121 on the spline section 12 cooperates with the internal spline 411 on the collar 41. In this way, it is convenient for the collar 41 to be firmly connected to the spline section 12, and the torque can be transmitted between the two through spline cooperation and a high coaxiality can be maintained, thus ensuring the limiting stability and accuracy of the second limiting member 4.

[0052] Even further, as shown in Figure 6 a positioning groove 412 is provided on one side of the collar 41 facing the threaded section 11, and the end of the threaded section 11 facing the collar 41 (that is, the connection of the threaded section 11 close to the spline section 12) extends into the positioning groove 412. In this way, it is convenient for the end of the threaded section 11 to be in positioning cooperation with the positioning groove 412, so as to ensure the correct connection between the collar 41 and the threaded section 11, reduce the assembly error, and further improve the working stability.

[0053] According to some alternative embodiments of the present invention, as shown in Figure 4 a second external spline 23 is provided on the outer peripheral surface of the nut 2. Such an arrangement can facilitate the connection and fixation of the nut 2 to the steering column (for example, an internal spline matching the second external spline 23 is provided on the inner circumference of the steering column), so as to limit the axial rotation of the nut 2 through the fixed column, and further achieve the effect of the lead screw 1 performing an axial linear motion relative to the nut 2.

[0054] The steering system according to the second aspect embodiment of the present invention includes the rotation limiting mechanism 100 of the above embodiment. Such a steering system having the rotation limiting mechanism 100 can limit the number of rotation turns of the steering shaft 200, thus achieving the protection effect on the angle sensor and the clock spring.

[0055] The vehicle according to the third aspect embodiment of the present invention includes the steering system of the above embodiment. Such a vehicle having the steering system can limit the number of rotation turns of the steering wheel, thus achieving the protection effect on the angle sensor and the clock spring.

[0056] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0057] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0059] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

[0060] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0061] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A rotational limit mechanism, characterized in that, Comprising: Steering column; Lead screw, the lead screw is located within the steering column, the lead screw comprising: a threaded section and a spline section, the spline section being connected to the threaded section, the spline section being adapted to cooperate with a steering shaft; Nut, the nut is disposed within the steering column, the nut is circumferentially limited and cooperates with the steering column, the nut cooperates with the threaded section, and first and second limiting portions are provided at opposite ends of the nut; First limiting member, the first limiting member is disposed at an end of the threaded section remote from the spline section, and when the nut is in a first position relative to the lead screw, the first limiting member and the first limiting portion are circumferentially limited and cooperate with each other on the circumference of the lead screw; Second limiting member, the second limiting member is disposed on the spline section, and when the nut is in a second position relative to the lead screw, the second limiting member and the second limiting portion are circumferentially limited and cooperate with each other on the circumference of the lead screw.

2. The rotational limit mechanism according to claim 1, wherein, The first limiting member comprises: End plate, the end plate is disposed at an end of the threaded section remote from the spline section; Third limiting portion, the third limiting portion is connected to the edge of the end plate and protrudes towards the nut, and when the nut is in a first position relative to the lead screw, the third limiting portion and the first limiting portion are circumferentially limited and cooperate with each other on the circumference of the lead screw.

3. The rotational limiting mechanism according to claim 2, wherein A first transition arc is provided at the connection between the end plate and the third limiting portion.

4. The rotational limiting mechanism according to claim 2, wherein, The end plate is provided with a first mounting hole, and an end face of the lead screw facing the first limiting member is provided with a second mounting hole, the first mounting hole and the second mounting hole are oppositely arranged and connected by a fastener.

5. The rotational limiting mechanism according to claim 1, characterized in that, The second limiting member comprises: Collar, the collar is sleeved on the spline section; Fourth limiting portion, the fourth limiting portion is disposed at the edge of the collar and protrudes towards the nut, and when the nut is in a second position relative to the lead screw, the fourth limiting portion and the second limiting portion are circumferentially limited and cooperate with each other on the circumference of the lead screw.

6. The rotational limit mechanism according to claim 5, characterized in that, A second transition arc is provided at the connection between the collar and the fourth limiting portion.

7. The rotational limiting mechanism according to claim 5, wherein The spline section is provided with a first external spline, the collar is provided with an internal spline, and the first external spline cooperates with the internal spline; and / or A positioning groove is provided on a side of the collar facing the threaded section, and an end of the threaded section facing the collar extends into the positioning groove.

8. The rotation limiting mechanism according to claim 1, characterized in that, The outer peripheral surface of the nut is provided with a second external spline.

9. A steering system, characterized in that, Comprising: The rotational limiting mechanism according to any one of claims 1-8.

10. A vehicle, characterized in that, Comprising: The steering system according to claim 9.

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