Angle limiting mechanism and steer-by-wire system

Abstract

The present application relates to the technical field of steer-by-wire systems, and in particular to an angle limiting mechanism and a steer-by-wire system. The angle limiting mechanism comprises a rotation member, a brake member and a housing, wherein the rotation member is rotationally arranged on the housing, an outer wall of the rotation member protrudes outwards in a radial direction of the rotation member to form a first limiting block, and a first rounded corner structure and a second rounded corner structure are provided on a first side and a second side of the first limiting block in a circumferential direction of the rotation member, respectively; and the rotation member has a first limit position and a second limit position. In the angle limiting mechanism, the first rounded corner structure and the second rounded corner structure are arranged such that the first limiting block can be in smoother contact with the brake member, and the two rounded corner structures can play a buffering role when the rotation member rotates to the two limit positions, thereby reducing impact between the rotation member and the brake member, reducing noise, protecting parts, and prolonging the service life of the parts.

Description

Angle limiter and steer-by-wire system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 19, 2024, with application number 202420538978.2 and invention name “Angle limiting mechanism and wire-controlled steering system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of wire-controlled steering systems, and in particular to an angle limiting mechanism and a wire-controlled steering system. Background Art

[0003] Steer-by-wire systems eliminate the mechanical connection between the steering gear and the steering wheel output shaft. Therefore, they require a tactile simulation unit to simulate tactile feel and control the number of steering wheel rotations. Traditional steering systems rely on a mechanical connection, with the number of steering wheel rotations determined by the total travel of the steering gear, typically two to three turns.

[0004] The limiting mechanism of the existing steering wheel feel simulation unit has the function of controlling the number of steering wheel rotations to protect the combination switch, clock spring, airbag coil and other devices assembled in the wire control steering system; the current limiting mechanism is often achieved by setting a rotating part connected to the steering shaft on the steering shaft, and setting a protruding structure on the outer wall of the rotating part, so that after rotating to a certain angle, the protruding structure and the protruding structure on the brake part used to cooperate with the rotating part are circumferentially offset to achieve the rotation limit of the steering wheel. This structure often generates a large impact force at the moment when the two protruding structures contact, which is not only easy to damage the parts and affect the service life of the parts, but also generates a large impact noise, affecting the driving experience. Summary of the Invention

[0005] In order to solve the above technical problems, the present application provides an angle limiting mechanism and a wire-controlled steering system.

[0006] In a first aspect, the present application provides an angle limiting mechanism, comprising a rotating member, a braking member, and a housing;

[0007] The rotating member is rotatably mounted on the housing, and a first stopper is formed on an outer wall of the rotating member and protrudes radially outward. The first stopper is provided with a first rounded corner structure and a second rounded corner structure along a first side and a second side of the circumference of the rotating member, respectively.

[0008] The rotating member has a first limit position and a second limit position. In the first limit position, the first rounded structure and the braking member abut against each other in the radial direction of the rotating member. In the second limit position, the second rounded structure and the braking member abut against each other in the radial direction of the rotating member.

[0009] The axis of the first rounded corner structure and the axis of the second rounded corner structure are both arranged parallel to the rotation axis of the rotating member.

[0010] Optionally, the projection of the first limit block on a plane perpendicular to the axis of the rotating member is trapezoidal, and the width of the first limit block on the side close to the axis of the rotating member is greater than the width on the side away from the axis of the rotating member.

[0011] Optionally, the first limiting block includes a first arc surface, a first end of the first arc surface is tangent to the first rounded structure, and a second end of the first arc surface is tangent to the outer wall of the rotating member;

[0012] And / or the first limiting block includes a second arc surface, a first end of the second arc surface is tangent to the second rounded structure, and a second end of the second arc surface is tangent to the outer wall of the rotating member.

[0013] Optionally, the shell is provided with a first support member and a second support member that slide with the rotating shaft of the rotating member, and the first support member and the second support member are completely misaligned with the first limit block in the axial direction of the rotating member; in the first extreme position, the first support member and the first rounded structure are symmetrically arranged about the axis of the rotating member in the radial direction of the rotating member; in the second extreme position, the second support member and the second rounded structure are symmetrically arranged about the axis of the rotating member in the radial direction of the rotating member.

[0014] Optionally, a second limiting block is formed on the outer wall of the braking member and protrudes radially outwards;

[0015] In the first extreme position, the first rounded structure and the second limit block abut against each other in the radial direction of the rotating part along the first side of the circumference of the braking part. In the second extreme position, the second rounded structure and the second limit block abut against each other in the radial direction of the rotating part along the second side of the circumference of the braking part.

[0016] Optionally, the brake member is rotatably arranged on the housing, the rotation axis of the brake member is arranged parallel to the rotation axis of the rotating member, and the brake member and the rotating member are transmission-connected via a transmission mechanism;

[0017] The distance between the outer wall of the rotating member and the outer wall of the braking member is greater than the height of the first limiting block protruding radially outward from the rotating member.

[0018] Optionally, the transmission mechanism includes one or more of a gear mechanism, a pulley mechanism and a chain mechanism.

[0019] Optionally, the second limiting block is provided with a third rounded corner structure and a fourth rounded corner structure along a first side and a second side of the circumference of the braking member respectively;

[0020] In the first extreme position, the first rounded corner structure and the third rounded corner structure abut against each other in the radial direction of the rotating member. In the second extreme position, the second rounded corner structure and the fourth rounded corner structure abut against each other in the radial direction of the rotating member.

[0021] Optionally, the axis of the rotating member and the axis of the braking member are both located on a first plane, the second plane is perpendicular to the first plane, and the distance between the second plane and the outer wall of the rotating member is equal to the distance between the second plane and the outer wall of the braking member;

[0022] In the first extreme position, the first rounded corner structure and the third rounded corner structure are symmetrical about the second plane;

[0023] In the second extreme position, the second rounded corner structure and the fourth rounded corner structure are symmetrical about the second plane.

[0024] In a second aspect, the present application provides a steer-by-wire system, comprising a steering shaft and the angle limiting mechanism as described above, wherein the steering shaft is transmission-connected to the steering wheel and the rotating member respectively.

[0025] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0026] The angle limiting mechanism provided by the present application utilizes a first rounded corner structure to abut against the brake member when the rotating member rotates to a first limit position, and utilizes a second rounded corner structure to abut against the brake member when the rotating member rotates to a second limit position, thereby limiting the angular rotation of the rotating member in the circumferential direction, thereby preventing excessive steering wheel rotation angles and damage to components such as the combination switch, clock spring, and airbag coil in the steer-by-wire system. The first and second rounded corner structures enable the first limit block on the rotating member to gradually approach the brake member using the rounded corner surface when the first limit block approaches the brake member until mutual compression and friction occur, and finally form a radially locked engagement with the rotating member, thereby limiting the angular rotation of the rotating member in either the clockwise or counterclockwise direction. This further smoothes the contact between the first limit block and the brake member. Both rounded corner structures act as buffers when the rotating member rotates to both limit positions, reducing impact between the rotating member and the brake member. This reduces noise while also protecting components directly or indirectly connected to the rotating member, such as the brake member, and thus increasing component life.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a schematic structural diagram of a steer-by-wire system according to an embodiment of the present application;

[0031] FIG2 is a schematic structural diagram of the angle limiting mechanism according to an embodiment of the present application;

[0032] FIG3 is a schematic structural diagram of one side of a rotating member according to an embodiment of the present application;

[0033] FIG4 is a schematic structural diagram of the other side of the rotating member according to an embodiment of the present application;

[0034] FIG5 is a schematic structural diagram of a brake member according to an embodiment of the present application;

[0035] FIG6 is a schematic diagram of the structure inside the housing according to an embodiment of the present application;

[0036] FIG7 is a schematic structural diagram of the end cover according to an embodiment of the present application;

[0037] FIG8 is a schematic structural diagram of the angle limiting mechanism according to an embodiment of the present application when in the first limit position;

[0038] FIG9 is a schematic structural diagram of the angle limiting mechanism according to an embodiment of the present application in an intermediate position;

[0039] FIG10 is a schematic structural diagram of the angle limiting mechanism according to an embodiment of the present application at the second extreme position.

[0040] Among them, 1. rotating part; 11. first limit block; 111. first arc surface; 112. second arc surface; 12. driving gear; 13. spline; 2. brake part; 21. second limit block; 211. third arc surface; 212. fourth arc surface; 22. driven gear; 3. housing; 31. end cover; 311. first abutting block; 312. second abutting block; 41. first rounded corner structure; 42. second rounded corner structure; 43. third rounded corner structure; 44. fourth rounded corner structure; 5. steering shaft; 6. steering column; 7. deceleration mechanism; 8. hand-feel motor; 9. support structure. Specific embodiments

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0044] Based on this, this embodiment provides an angle limiting mechanism and a steer-by-wire system. By utilizing the first rounded corner structure to abut against the brake member when the rotating member rotates to the first extreme position, and utilizing the second rounded corner structure to abut against the brake member when the rotating member rotates to the second extreme position, the angular limit of the rotating member in the circumferential direction is achieved, thereby preventing excessive steering wheel rotation angles that could damage components such as the combination switch, clock spring, and airbag coil in the steer-by-wire system. The first and second rounded corner structures enable the first limit block on the rotating member to gradually approach the brake member using the rounded corner surface when approaching the brake member, until mutual compression and friction occur, ultimately forming a radially locked engagement with the rotating member, thereby limiting the angular limit of the rotating member in either the clockwise or counterclockwise direction. This further smoothes the contact between the first limit block and the brake member. Both rounded corner structures act as buffers when the rotating member rotates to both extreme positions, reducing impact between the rotating member and the brake member. This reduces noise while also protecting components directly or indirectly connected to the rotating member and the brake member, thereby increasing component life. The following describes it in detail through specific embodiments:

[0045] 1 to 10 , an angle limiting mechanism provided in this embodiment includes a rotating member 1, a brake member 2 and a housing 3; the rotating member 1 is rotatably arranged on the housing 3, and a first limit block 11 is formed on the outer wall of the rotating member 1 protruding radially outward, and the first limit block 11 is provided with a first rounded structure 41 and a second rounded structure 42 along the first and second sides of the circumference of the rotating member 1, respectively; the rotating member 1 has a first extreme position and a second extreme position, in the first extreme position, the first rounded structure 41 and the brake member 2 abut against each other in the radial direction of the rotating member 1, and in the second extreme position, the second rounded structure 42 and the brake member 2 abut against each other in the radial direction of the rotating member 1; the axis of the first rounded structure 41 and the axis of the second rounded structure 42 are both arranged parallel to the rotation axis of the rotating member 1; it should be understood that the rotating member 1 also has an intermediate position, the rotating member 1 rotates clockwise from the intermediate position by a certain angle to the first extreme position, and the rotating member 1 rotates counterclockwise from the intermediate position by the same angle to the second extreme position.

[0046] The angle limiting mechanism provided in this embodiment uses the first rounded corner structure 41 to abut against the brake member 2 when the rotating member 1 rotates to the first limit position, and uses the second rounded corner structure 42 to abut against the brake member 2 when the rotating member 1 rotates to the second limit position; thereby limiting the angle of rotation of the rotating member 1 in the circumferential direction, avoiding excessive rotation of the steering wheel angle, which may damage the combination switch, clock spring, airbag coil and other components in the wire-controlled steering system; by providing the first rounded corner structure 41 and the second rounded corner structure 42, the first limit block 11 on the rotating member 1 can be close to the brake member 2. When the rotating part 1 is rotated to the two extreme positions, the two rounded corner structures can both play a buffering role, reducing the impact between the rotating part 1 and the brake part 2, which can reduce noise, and at the same time protect the rotating part 1, the brake part 2 and other parts directly or indirectly connected to the two, thereby increasing the life of the parts.

[0047] It should be noted that the angle limiting mechanism utilizes the first limit block 11 on the outer wall of the rotating part 1 to produce radial extrusion of the rotating part 1 with the brake part 2 at two extreme positions, thereby completing the angle limitation of the rotating part 1, which can reduce the axial size of the entire angle limiting mechanism, and can effectively shorten the overall axial length of the wire hole steering system using the angle limiting mechanism, which is more convenient for the arrangement of the wire hole steering system in the whole vehicle environment.

[0048] In some embodiments, the projection of the first limit block 11 on a plane perpendicular to the axis of the rotating part 1 is a trapezoid, and the width of the first limit block 11 on the side close to the axis of the rotating part 1 is greater than the width on the side away from the axis of the rotating part 1; specifically, the projection of the first limit block 11 on a plane perpendicular to the axis of the rotating part 1 can be an isosceles trapezoid or a right-angled trapezoid; the first limit block 11 of such a structure has a larger connection surface with the rotating part 1, which can make the connection between the two more reliable and stable when radial or circumferential extrusion force occurs between the first limit block 11 and the rotating part 1; in other embodiments, the projection of the first limit block 11 on a plane perpendicular to the axis of the rotating part 1 can also be a square, a rectangle, a parallelogram or the like, as long as the first rounded corner structure 41 and the second rounded corner structure 42 can be formed in the circumferential direction.

[0049] In a further embodiment, the first limit block 11 includes a first arc surface 111, a first end of the first arc surface 111 is tangent to the first rounded structure 41, and a second end of the first arc surface 111 is tangent to the outer wall of the rotating member 1; and / or the first limit block 11 includes a second arc surface 112, a first end of the second arc surface 112 is tangent to the second rounded structure 42, and a second end of the second arc surface 112 is tangent to the outer wall of the rotating member 1; it should be understood that the convex surface of the first arc surface 111 and the convex surface of the second arc surface 112 face each other to prevent the first arc surface 111 and the second arc surface from being tangent to each other. 112 forms interference between the first limit block 11 and the brake member 2; through the setting of the first arc surface 111 and the second arc surface 112, the length of the contact surface between the first limit block 11 and the rotating member 1 in the circumferential direction of the rotating member 1 can be further extended, and the connection area between the first limit block 11 and the rotating member 1 is further improved; at the same time, the first arc surface 111 and the second arc surface 112 can be used to form a reinforcing rib structure between the rotating member 1 and the first limit block 11 in the circumferential direction of the rotating member 1, further improving the connection reliability and stability between the first limit block 11 and the rotating member 1.

[0050] In other embodiments, the first limit block 11 may also be connected to the rotating member 1 on both sides of the circumference of the rotating member 1 through an inclined surface structure; as long as a reinforcing rib structure can be formed between the rotating member 1 and the first limit block 11.

[0051] In some embodiments, the shell 3 is provided with a first support member and a second support member that slides with the rotating shaft of the rotating member 1, and the first support member and the second support member are completely misaligned with the first limit block 11 in the axial direction of the rotating member 1; that is, when the first limit block 11 rotates following the rotating member 1, the first support member and the second support member will not interfere with the first limit block 11; in the first extreme position, the first support member and the first rounded structure 41 are symmetrically arranged in the radial direction of the rotating member 1 about the axis of the rotating member 1, and the radial pressure generated by the brake member 2 on the first rounded structure 41 can be offset by a part of the first support member, and the pressure continues to be transmitted to the shell 3; in the second extreme position, the second support member and the second rounded structure 42 are symmetrically arranged in the radial direction of the rotating member 1 about the axis of the rotating member 1, and the radial pressure generated by the brake member 2 on the second rounded structure 42 can be offset by a part of the second support member, and the pressure continues to be transmitted to the shell 3.

[0052] Continuing with reference to Figures 2 and 6, the first support member and the second support member can both radially support the rotating shaft of the rotating member 1 through an arc surface that slides with the rotating shaft of the rotating member 1. The first support member and the second support member can be connected into an integral structure. Specifically, the first support member and the second support member can both be formed on a fan-shaped support structure 9 supported on the rotating shaft of the rotating member 1. The support structure 9 can be specifically arranged on the side of the rotating member 1 away from the brake member 2. The support structure 9 can also be a circular ring structure mounted on the rotating shaft of the rotating member 1. As long as it can provide a supporting force to the rotating member 1 that is opposite to the radial force transmitted by the first limit block 11 when the rotating member 1 moves to the first extreme position or the second extreme position, it can provide the rotating member 1 with a supporting force that is opposite to the radial force transmitted by the first limit block 11; the extrusion force generated by the brake member 2 on the rotating member 1 can be transmitted to the shell 3 through the first support member and the second support member, and form support for the rotating shaft of the rotating member 1, thereby ensuring the reliability and stability of the rotating member 1 itself and improving the service life of the rotating member 1.

[0053] Continuing with reference to Figures 5 and 8 to 10, a second limit block 21 is formed on the outer wall of the brake member 2 in a radially outward protrusion; in the first extreme position, the first rounded structure 41 and the second limit block 21 are against each other along the first side of the circumference of the brake member 2 in the radial direction of the rotating member 1, and in the second extreme position, the second rounded structure 42 and the second limit block 21 are against each other along the second side of the circumference of the brake member 2 in the radial direction of the rotating member 1; the second limit block 21 can be two, respectively against the first rounded structure 41 and the second rounded structure on the rotating member 1 The structure 42 abuts and cooperates, and the second limit block 21 can also be one, extending circumferentially on the outer wall of the brake part 2, and the two ends abut and cooperate with the first rounded structure 41 and the second rounded structure 42 on the rotating part 1 respectively; by arranging a raised second limit block 21 on the outer wall of the brake part 2, it can abut and cooperate with the first limit block 11, forming a buffering effect when the two collide and are squeezed, and at the same time can also protect the structure of the brake part 2 itself, to avoid excessive local pressure on the brake part 2, resulting in deformation and the like.

[0054] The second limiting block 21 includes a third arc surface 211, a first end of the third arc surface 211 is tangent to the third rounded structure 43, and a second end of the third arc surface 311 is tangent to the outer wall of the brake member 2; and / or the second limiting block 21 includes a fourth arc surface 312, a first end of the fourth arc surface 312 is tangent to the fourth rounded structure 44, and a second end of the fourth arc surface 312 is tangent to the outer wall of the brake member 2; it should be understood that the convex surface of the third arc surface 211 and the convex surface of the fourth arc surface 312 face each other to prevent the third arc surface 311 and the fourth arc surface 412 from contacting the third arc surface 211 and the fourth arc surface 312. Interference is formed between the second limit block 21 and the first limit block 11; by setting the third arc surface 311 and the fourth arc surface 312, the length of the contact surface between the second limit block 21 and the brake part 2 in the circumferential direction of the brake part 2 can be further extended, and the connection area between the second limit block 21 and the brake part 2 can be further increased; at the same time, the third arc surface 311 and the fourth arc surface 312 can be used to form a reinforcing rib structure between the brake part 2 and the second limit block 21 in the circumferential direction of the brake part 2, further improving the connection reliability and stability between the second limit block 21 and the brake part 2.

[0055] In other embodiments, the second limit block 21 may also be connected to the brake member 2 on both sides of the circumference of the brake member 2 through an inclined surface structure; as long as a reinforcing rib structure can be formed between the brake member 2 and the second limit block 21.

[0056] In some embodiments, the first limit block 11 can be integrally formed with the rotating part 1, specifically by powder metallurgy processing, or by casting, etc.; the second limit block 21 can be integrally formed with the brake part 2, specifically by powder metallurgy processing, or by casting, etc.; thereby ensuring the strength of the parts themselves while reducing costs.

[0057] In some embodiments, the brake member 2 is rotatably arranged on the housing 3, the rotation axis of the brake member 2 is arranged parallel to the rotation axis of the rotating member 1, and the brake member 2 and the rotating member 1 are connected to each other through a transmission mechanism; the distance between the outer wall of the rotating member 1 and the outer wall of the brake member 2 is greater than the height of the first limit block 11 protruding radially outward along the rotating member 1, that is, when the rotating member 1 rotates, the outer wall of the brake member 2 will not interfere with the first limit block 11, so as to ensure that the rotating member 1 completes more than one rotation; at this time, the number of the second limit block 21 can be one, and the second limit block 21 can move with the rotation of the brake member 2, when the first limit block 11 moves to the first limit position, the first rounded structure 41 abuts against one side of the second limit block 21, and when the first limit block 11 moves to the second limit position, the second rounded structure 42 abuts against the other side of the second limit block 21; as long as it can be ensured that the first limit block 11 and the second limit block 21 do not interfere with each other when the first limit block 11 moves from the first limit position to the second limit position.

[0058] Specifically, the transmission ratio of the rotating member 1 and the brake member 2 is greater than 1. This setting can not only ensure that the rotating member 1 can achieve a rotation angle greater than one circle, but also prevent the brake member 2 from rotating at an excessively large angle, resulting in excessive wear between the rotating shaft of the brake member 2 and the housing 3, affecting the service life of the brake member 2; in some embodiments, the speed ratio of the rotating member 1 and the brake member 2 can be 61:18, so that when the brake member 2 rotates 301°, the rotating member 1 can complete a rotation angle of 1021°, which is more in line with the limited rotation angle of the steering wheel in the current mainstream market; as long as the speed ratio of the rotating member 1 and the brake member 2 can be greater than 2 and less than 4; in a further embodiment, the angle passed by the rotating member 1 from the first extreme position to the second extreme position, that is, the S length shown in Figure 9, can be adjusted by changing the length of the first limit block 11 extending in the circumferential direction of the rotating member 1 and / or the length of the second limit block 21 extending in the circumferential direction of the brake member 2.

[0059] In a further embodiment, the transmission mechanism includes one or more of a gear mechanism, a pulley mechanism and a chain mechanism; when the transmission mechanism is a gear mechanism, the number of teeth of the driving gear 12 on the rotating part 1 can be 18, and the number of teeth of the driven gear 22 on the brake part 2 can be 61; at this time, the continuous working characteristics of the gear transmission can also be utilized to ensure that the limiting offset between the first limit block 11 and the brake part 2 is gradual, which can play a buffering role, effectively avoid impact noise, and will not cause self-locking problems; when the transmission mechanism is a pulley mechanism or a chain mechanism, when the first limit block 11 and the brake part 2 are offset, the belt or chain can be used to surround the brake part 2 and the rotating part 1, thereby offsetting a part of the radial force of the rotating part 1 and the brake part 2 moving away from each other; wherein the belt can be an elastic material, and its own elastic force is used to bind the rotating part 1 and the brake part 2 together to ensure stability when the two are offset.

[0060] In some embodiments, the second limit block 21 is provided with a third rounded structure 43 and a fourth rounded structure 44 along the first side and the second side of the circumference of the brake part 2, respectively; in the first extreme position, the first rounded structure 41 and the third rounded structure 43 are offset against each other in the radial direction of the rotating part 1, and in the second extreme position, the second rounded structure 42 and the fourth rounded structure 44 are offset against each other in the radial direction of the rotating part 1; the third rounded structure 43 and the fourth rounded structure 44 can further realize the progressive offset of the first limit block 11 and the second limit block 21, thereby further reducing the impact when the two are offset.

[0061] In a further embodiment, the first limit block 11 and / or the second limit block 21 are provided with elastic buffer pads, such as rubber pads, plastic pads, etc., so as to further improve the buffering effect when the two collide with each other, and at the same time protect the first limit block 11 and / or the second limit block 21, thereby extending the service life of the first limit block 11 and / or the second limit block 21.

[0062] Continuing with reference to Figure 9, the axis of the rotating part 1 and the axis of the braking part 2 are both located on the first plane, the second plane is perpendicular to the first plane, and the spacing between the second plane and the outer wall of the rotating part 1 is equal to the spacing between the second plane and the outer wall of the braking part 2; in the first extreme position, the first rounded corner structure 41 and the third rounded corner structure 43 are symmetrical about the second plane; in the second extreme position, the second rounded corner structure 42 and the fourth rounded corner structure 44 are symmetrical about the second plane; this can ensure that the rounded corner structure on the rotating part 1 and the rounded corner structure on the braking part 2 are at the optimal angle when they are offset against each other, and the rounded corner structure on the rotating part 1 and the rounded corner structure on the braking part 2 can both face each other and offset each other, thereby improving the reliability and stability between the two when they are offset against each other.

[0063] Continuing with reference to Figures 1, 2 and 7, the shell 3 includes an end cover 31, which is detachable from the shell 3, thereby facilitating maintenance of structures such as the rotating part 1 and the brake part 2 inside the shell 3; at the same time, the end cover 31 can also form a sealed protection for the working space of the rotating part 1 and the brake part 2.

[0064] Furthermore, the end cover 31 can be provided with a first abutment block 311 that abuts and limits the axial end of the rotating part 1, and the end cover 31 can also be provided with a second abutment block 312 that abuts and limits the axial end of the braking part 2; through the arrangement of the first abutment block 311 and the second abutment block 312, the rotating part 1 and the braking part 2 can be supported and stabilized to ensure the stability of the rotating part 1 and the braking part 2 during rotation. The first abutment block 311 and the second abutment block 312 can also be thrust bearings to achieve a stable connection between the rotating part 1 and the braking part 2 and the end cover 31.

[0065] Secondly, the present application provides a wire-controlled steering system, including a steering shaft 5 and the angle limiting mechanism as described above, the steering shaft 5 is respectively connected to the steering wheel and the rotating part 1; the outer side of the steering shaft 5 is provided with a steering column 6, the output end of the steering shaft 5 is connected to the input end of the reduction mechanism 7, and the output end of the reduction mechanism 7 is connected to the feel motor 8; the shell 3 can be set on the vehicle body, and can also be set on the outer shell of the reduction mechanism 7.

[0066] Specifically, the rotating part 1 can be connected to the steering shaft 5 through a spline 13, and the rotating part 1 can also be connected to the steering shaft 5 through interference fit, snap connection, bonding or axle pin plug-in. The steering shaft 5 can also be connected to the input end of the reduction mechanism 7 through the above connection methods.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0068] The foregoing description is intended only to provide specific embodiments of the present application, which will enable those skilled in the art to understand and implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments described herein, but is intended to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. An angle limiting mechanism, characterized in that: It includes a rotating part, a braking part and a housing; The rotating member is rotatably mounted on the housing, and a first stopper is formed on an outer wall of the rotating member and protrudes radially outward. The first stopper is provided with a first rounded corner structure and a second rounded corner structure along a first side and a second side of the circumference of the rotating member, respectively. The rotating member has a first limit position and a second limit position. In the first limit position, the first rounded structure and the braking member abut against each other in the radial direction of the rotating member. In the second limit position, the second rounded structure and the braking member abut against each other in the radial direction of the rotating member. The axis of the first rounded corner structure and the axis of the second rounded corner structure are both arranged parallel to the rotation axis of the rotating member.

2. The angle limiting mechanism according to claim 1, characterized in that: The projection of the first limit block on a plane perpendicular to the axis of the rotating member is trapezoidal, and the width of the first limit block on a side close to the axis of the rotating member is greater than the width on a side away from the axis of the rotating member.

3. The angle limiting mechanism according to claim 2, characterized in that: The first limiting block includes a first arc surface, a first end of the first arc surface is tangent to the first rounded structure, and a second end of the first arc surface is tangent to the outer wall of the rotating member; And / or, the first limiting block includes a second arc surface, a first end of the second arc surface is tangent to the second rounded structure, and a second end of the second arc surface is tangent to the outer wall of the rotating member.

4. The angle limiting mechanism according to any one of claims 1 to 3, characterized in that: The shell is provided with a first support member and a second support member that slide with the rotating shaft of the rotating member, and the first support member and the second support member are completely misaligned with the first limit block in the axial direction of the rotating member; in the first extreme position, the first support member and the first rounded structure are symmetrically arranged in the radial direction of the rotating member with respect to the axis of the rotating member; in the second extreme position, the second support member and the second rounded structure are symmetrically arranged in the radial direction of the rotating member with respect to the axis of the rotating member.

5. The angle limiting mechanism according to any one of claims 1 to 4, characterized in that: A second limiting block is formed on the outer wall of the braking member and protrudes outward in the radial direction thereof; In the first extreme position, the first rounded structure and the second limit block abut against each other in the radial direction of the rotating part along the first side of the circumference of the braking part. In the second extreme position, the second rounded structure and the second limit block abut against each other in the radial direction of the rotating part along the second side of the circumference of the braking part.

6. The angle limiting mechanism according to claim 5, characterized in that: The brake member is rotatably mounted on the housing, the rotation axis of the brake member is parallel to the rotation axis of the rotating member, and the brake member and the rotating member are connected via a transmission mechanism; The distance between the outer wall of the rotating member and the outer wall of the braking member is greater than the height of the first limiting block protruding radially outward from the rotating member.

7. The angle limiting mechanism according to claim 6, characterized in that: The transmission mechanism includes one or more of a gear mechanism, a pulley mechanism and a chain mechanism.

8. The angle limiting mechanism according to any one of claims 5 to 7, characterized in that: The second limiting block is provided with a third rounded corner structure and a fourth rounded corner structure along a first side and a second side of the circumference of the braking member respectively; In the first extreme position, the first rounded corner structure and the third rounded corner structure abut against each other in the radial direction of the rotating member. In the second extreme position, the second rounded corner structure and the fourth rounded corner structure abut against each other in the radial direction of the rotating member.

9. The angle limiting mechanism according to claim 8, characterized in that: The axis of the rotating member and the axis of the braking member are both located on a first plane, a second plane is perpendicular to the first plane, and a distance between the second plane and the outer wall of the rotating member is equal to a distance between the second plane and the outer wall of the braking member; In the first extreme position, the first rounded corner structure and the third rounded corner structure are symmetrical about the second plane; In the second extreme position, the second rounded corner structure and the fourth rounded corner structure are symmetrical about the second plane.

10. The angle limiting mechanism according to claim 8, characterized in that: The second limiting block includes a third arc surface, a first end of the third arc surface is tangent to the third rounded structure 43, and a second end of the third arc surface is tangent to the outer wall of the brake member; And / or, the second limiting block includes a fourth arc surface, a first end of the fourth arc surface is tangent to the fourth rounded structure, and a second end of the fourth arc surface is tangent to the outer wall of the braking component.

11. The angle limiting mechanism according to any one of claims 5 to 10, characterized in that: An elastic buffer pad is provided on the first limiting block and / or the second limiting block.

12. A steer-by-wire system, characterized in that: It comprises a steering shaft and the angle limiting mechanism according to any one of claims 1 to 11, wherein the steering shaft is transmission-connected to the steering wheel and the rotating member respectively.

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