Steering column telescopic shaft

Abstract

The present disclosure relates to a steering column telescopic shaft comprising: a first shaft having an outer engagement end; the second shaft is provided with a barrel-shaped inner joint end, and the inner wall of the inner joint end is provided with a first anti-torsion guide part extending in the axial direction; the sleeve is arranged at the outer joint end of the first shaft in an anti-torsion mode in a sleeving mode, the sleeve is provided with a second anti-torsion guide part extending in the axial direction, the sleeve is sleeved with the inner joint end of the second shaft, the main body section of the first anti-torsion guide part and the main body section of the second anti-torsion guide part are basically consistent in shape, and when the first anti-torsion guide part and the second anti-torsion guide part are jointed in shape, the first anti-torsion guide part and the second anti-torsion guide part are connected. And the main body section of the second anti-torque guide part is stressed to generate radial elastic deformation, so that the second shaft realizes circumferential torque transmission and axial sliding relative to the first shaft. Through the elastic reset of the second anti-torsion guide part, the gap generated by abrasion of the second anti-torsion guide part and the first anti-torsion guide part of the sleeve after the second shaft and the first shaft relatively move in the axial direction for a long time is compensated, and the precision, stability and durability of torque transmission are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle wire-controlled steering, in particular to a telescopic shaft of a steering column. Background Art

[0002] The automobile steer-by-wire system (SBW) means that there is no direct mechanical structure connection between the steering wheel and the wheels, and the steering wheel controls the wheels through cables.

[0003] Vehicles (such as automobiles, trucks, sport utility vehicles, crossovers, minivans, boats, aircraft, all-terrain vehicles, recreational vehicles, or other suitable vehicles) typically include various steering components of an electric power steering system adapted to provide steering assistance to the operator of such a vehicle. Such steering components typically include one or more sensors adapted to provide various sensed values to a controller. The controller typically uses the various sensed values to generate assist torque.

[0004] In the related art, the wire-controlled steering system includes a steering column mechanism (also called a column mechanism). The traditional steering column mechanism includes a telescopic adjustment component. The telescopic adjustment component includes a telescopic steering column that can achieve axial telescoping, thereby achieving adjustment of the front and rear position of the steering wheel.

[0005] At present, the design of the telescopic shaft of the steering column generally realizes torque transmission and telescopic functions simultaneously through the cooperation of external splines and internal splines. However, in the wire-controlled steering system, with long-term torque rotation and telescopic friction, wear will occur between the internal splines and the external splines, and then a gap in the radial or circumferential direction will be generated, thereby affecting the control safety of the controller. In addition, the gap will also pose a noise risk. Utility Model Content

[0006] In order to overcome the problems existing in the related art, the present disclosure provides a telescopic shaft of a steering column.

[0007] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a steering column telescopic shaft, comprising: a first shaft having an outer joint end; a second shaft, the second shaft having a cylindrical inner joint end, the inner wall of the inner joint end being provided with an axially extending first anti-torsion guide portion; a sleeve, which is torque-resistantly sleeved on the outer joint end of the first shaft, the sleeve being provided with an axially extending second anti-torsion guide portion, the inner joint end of the second shaft being sleeved on the outside of the sleeve, the main body section of the first anti-torsion guide portion and the main body section of the second anti-torsion guide portion having a basically identical shape, and when the shapes of the two are engaged, the main body section of the second anti-torsion guide portion is subjected to force to produce radial elastic deformation, so that the second shaft can achieve circumferential torque transmission and axial sliding relative to the first shaft.

[0008] In some embodiments, the first anti-torsion guide portion is an axially extending groove on the inner wall of the inner joint end of the second shaft, and the second anti-torsion guide portion is a hollow boss formed by the radial outward protrusion of the cylindrical wall of the sleeve, wherein when the second anti-torsion guide portion is axially introduced into the first anti-torsion guide portion and radially compressed, it can be elastically deformed along the radial inner side and both circumferential sides.

[0009] In some embodiments, the second anti-torsion guide portion has a triangular profile that is radially convex relative to the cylindrical surface.

[0010] In some embodiments, the outer joint end of the first shaft is provided with an axially extending anti-rotation surface, the anti-rotation surface is recessed relative to the circumferentially connected cylindrical surface, and an anti-rotation stop wall is formed between the anti-rotation surface and the connected cylindrical surface; the barrel wall of the sleeve is provided with a recessed platform adapted to the shape of the anti-rotation surface, the recessed platform is elastically abutted against the anti-rotation surface, and the circumferential sides of the recessed platform are abutted against the anti-rotation stop wall, thereby realizing a torsional-resistant connection between the sleeve and the first shaft.

[0011] In some embodiments, there are at least three anti-rotation surfaces, which are arranged at equal intervals along the circumference.

[0012] In some embodiments, the sleeve wall is provided with a radially penetrating isolation hole for circumferentially isolating the second anti-torsion guide portion and the concave platform.

[0013] In some embodiments, the outer joining end of the first shaft has circumferentially spaced cylindrical segments, and axially includes a first cylindrical segment and a second cylindrical segment with different outer diameters. The axial ends of the sleeve include a first reduced diameter opening and a second reduced diameter opening with different inner diameters, which are interference fit with the first cylindrical segment and the second cylindrical segment, respectively.

[0014] In some embodiments, an annular radial groove is provided on the circumference of the first shaft, and the steering column telescopic shaft further includes a retaining ring, which is installed in the radial groove and abuts against the axial end surface of the sleeve.

[0015] In some embodiments, the second shaft includes: an inner nested tube, the inner wall of the inner nested tube forming the first anti-torsion guide portion; an outer sleeve, which is anti-torsionally sleeved on the outside of the inner nested tube, wherein the outer sleeve is made of metal material and the inner nested tube is made of PA66 material.

[0016] In some embodiments, the outer wall of the inner nested tube is provided with external teeth; the inner wall of the outer sleeve is provided with internal teeth, and the outer sleeve and the inner nested tube are anti-torsionally connected by the engagement of the internal teeth with the external teeth.

[0017] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: the cooperation between the axially extending second anti-torsion guide portion and the first anti-torsion guide portion enables a torsionally fixed connection between the second shaft and the first shaft while also allowing for axial movement. Furthermore, after prolonged relative axial movement between the second shaft and the first shaft, the elastic deformation and radial resetting of the second anti-torsion guide portion compensate for the gap created by prolonged wear between the second anti-torsion guide portion of the sleeve and the first anti-torsion guide portion of the first shaft. This ensures gapless torque transmission between the sleeve and the second shaft even after prolonged use, improves the accuracy of circumferential torque transmission and angular accuracy, enhances the durability of the entire steering column telescopic shaft, and simultaneously achieves low friction and low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0019] Figure 1 is a perspective view of a telescopic shaft of a steering column according to an exemplary embodiment;

[0020] Figure 2 is an axonometric view of a telescopic shaft of a steering column according to an exemplary embodiment;

[0021] Figure 3 is a perspective view of a first axis according to an exemplary embodiment;

[0022] Figure 4 is an end side view of a first shaft according to an exemplary embodiment;

[0023] Figure 5 is a perspective view of a sleeve according to an exemplary embodiment;

[0024] Figure 6 is a transverse cross-sectional view of a sleeve after being mated with a first shaft according to an exemplary embodiment;

[0025] Figure 7 is an axial cross-sectional view of a sleeve after being mated with a first shaft according to an exemplary embodiment;

[0026] Figure 8 is a perspective view of a second shaft according to an exemplary embodiment. DETAILED DESCRIPTION

[0027] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0028] In this disclosure, unless otherwise specified, the axial direction A, radial direction R, and circumferential direction W refer to the axial direction A, radial direction R, and circumferential direction W of the telescopic steering column shaft 100, respectively. The term "torsionally rigid connection" refers to a connection between two components that prevents rotation relative to each other. This connection can be achieved via a press fit (i.e., an interference fit) or by integrally forming the two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure depending on the specific circumstances.

[0029] In order to solve the above technical problems, Figure 1 As shown, the present disclosure provides a steering column telescopic shaft 100, as shown Figure 1 and Figure 2 As shown, the steering column telescopic shaft 100 includes a first shaft 10 and a second shaft 20. The first shaft 10 has an outer joint end, which constitutes the base part of the steering column telescopic shaft 100. The second shaft 20 has a cylindrical inner joint end, which is sleeved on the outside of the outer joint end of the first shaft 10 and is used to achieve a torsion-resistant connection and axial relative sliding with the first shaft 10.

[0030] Furthermore, a sleeve 30 is provided between the first shaft 10 and the second shaft 20. The sleeve 30 is sleeved on the outer wall of the first shaft 10 in a torsion-resistant manner. Figure 5 As shown, the outer wall of the sleeve 30 is provided with a second anti-torsion guide portion 31 extending in the axial direction A, wherein the second anti-torsion guide portion 31 includes transition sections at both axial ends and a main body section in the middle.

[0031] like Figure 8 As shown, the inner wall of the inner joint end of the second shaft 20 is correspondingly provided with a first anti-torsion guide portion 21 extending in the axial direction A. The first anti-torsion guide portion 21 is configured to cooperate with the second anti-torsion guide portion 31. Accordingly, the first anti-torsion guide portion 21 also has transition regions and a main body section at both axial ends.

[0032] The main section of the first anti-torsion guide 21 matches the main section of the second anti-torsion guide 31 in shape. When the inner engagement end of the second shaft 20 is sleeved outside the sleeve 30, the main section of the second anti-torsion guide 31 cooperates with the main section of the first anti-torsion guide 21, enabling the second shaft 20 to transmit torque in the circumferential direction W and slide relative to the first shaft 10 in the axial direction A. The shape and size of the transition section between the first anti-torsion guide 21 and the transition section between the second anti-torsion guide 31 do not affect the relative axial sliding between the main sections of the first anti-torsion guide 21 and the second anti-torsion guide 31.

[0033] More specifically, the second anti-torsion guide portion 31 of the sleeve 30 is capable of elastic deformation. After the second shaft 20 is sleeved on the outside of the sleeve 30, an interference fit can be achieved between the main body section of the second anti-torsion guide portion 31 and the main body section of the first anti-torsion guide portion 21. Therefore, the main body section of the second anti-torsion guide portion 31 will be radially compressed and elastically deformed and bent in the radial direction R and the circumferential direction W, thereby eliminating the gap between the second anti-torsion guide portion 31 and the first anti-torsion guide portion 21 in the radial direction R and the circumferential direction W.

[0034] The cooperation between the second anti-torsion guide 31 and the first anti-torsion guide 21 not only ensures a torsion-resistant connection between the first and second shafts 10, 20, but also allows the second shaft 20 to slide relative to the first shaft 10 in the axial direction A, thereby facilitating adjustment of the fore-aft position of the steering wheel. The elastic deformation of the second anti-torsion guide 31 eliminates radial and circumferential clearances between the second and first anti-torsion guides 31, enabling gapless torque transmission between the first and second shafts 10, 20, and improving the accuracy and stability of torque transmission.

[0035] Gapless torque transmission reduces friction, quiets noise, and enhances the driving experience. Even if the second anti-torsion guide 31 and the first anti-torsion guide 21 inevitably wear out after extended use, the elastically deformable second anti-torsion guide 31 can be elastically reset to compensate for the gap between them, thereby improving the durability and service life of the telescopic steering column shaft 100.

[0036] Clearance-free torque transmission ensures that the telescopic steering column shaft 100 maintains excellent control performance even after extended use, improving the durability and safety of the steer-by-wire system. This reduces wear and extends service life, thereby reducing maintenance frequency and costs.

[0037] It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are merely used to distinguish structures of the same type from one another and do not indicate a particular order or importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, the first axis 10 could also be referred to as the second axis 20, and similarly, the second axis 20 could also be referred to as the first axis 10, without departing from the scope of this disclosure.

[0038] In addition, in this embodiment, the first shaft 10 may be an output shaft, and the second shaft 20 may be an input shaft. In other embodiments, the first shaft 10 may also be an input shaft, and the second shaft 20 may be an output shaft, which is not specifically limited here.

[0039] In the present embodiment, the first anti-torsion guide portion 21 is a groove extending axially on the inner wall of the inner joint end of the second shaft 20, and the second anti-torsion guide portion 31 is a hollow boss formed by radially outward protrusion of the wall of the sleeve 30 (such as Figure 6 and Figure 7 As shown), when the second anti-torsion guide portion 31 is compressed, it can be elastically deformed along the inner side of the radial direction R and the circumferential side W.

[0040] In other embodiments, the first anti-torsion guide portion 21 may be a boss, and in this case, the second anti-torsion guide portion 31 may be a groove. In this embodiment, the first anti-torsion guide portion 21 is a groove, and the second anti-torsion guide portion 31 is a boss.

[0041] like Figure 2 and Figure 5 As shown, the sleeve 30 is in a sleeve shape and can be made of a metal material. In particular, the sleeve 30 is integrally formed from a 1 mm thick steel plate through a stamping process. The process is simple and improves the rigidity of the entire sleeve 30.

[0042] The hollow boss formed by the radially outward protrusion R of the sleeve wall of the sleeve 30 creates a radial spacing R between the second anti-torsion guide portion 31 and the outer wall of the first shaft 10. While ensuring the rigidity of the second anti-torsion guide portion 31, this radial spacing R allows elastic deformation in the radial R and circumferential W directions, thereby improving the overall rigidity of the steering column telescopic shaft 100 and the accuracy of torque transmission, reducing friction and wear, and enhancing the reliability and service life of the steer-by-wire system.

[0043] In some embodiments, the shapes of the second anti-torsion guide portion 31 and the first anti-torsion guide portion 21 need to match. The cross-sections of the second anti-torsion guide portion 31 and the first anti-torsion guide portion 21 can be any shape such as a trapezoid, a square, etc.

[0044] In this embodiment, the second anti-torsion guide 31 has a triangular profile that protrudes radially from the cylindrical surface. Specifically, the cross-sections of the second anti-torsion guide 31 and the first anti-torsion guide 21 can be triangular. The convex triangular cross-section of the second anti-torsion guide 31 and the concave triangular cross-section of the first anti-torsion guide 21, when combined, result in only six friction surfaces between the sleeve 30 and the second shaft 20. Compared to the dozens of traditional spline teeth, this significantly reduces friction, thereby significantly reducing noise during extension and torque transmission, and enhancing the driving experience.

[0045] Furthermore, the reduced number of friction surfaces and the resilient design of the second anti-torsion guide 31 allow the friction surface of the second anti-torsion guide 31 to better mate with the friction surface of the first anti-torsion guide 21 of the second shaft 20, thereby improving the overall rigidity of the telescopic steering column shaft 100 and enhancing the stability and reliability of the steer-by-wire system. This design helps extend the service life of the telescopic steering column shaft 100 and reduces maintenance costs. Furthermore, reducing the number of friction surfaces simplifies the structural design, reduces production complexity, and helps improve manufacturing efficiency.

[0046] In this embodiment, if Figure 3 and Figure 4 As shown, the outer wall of the outer joint end of the first shaft 10 is provided with an anti-rotation surface 11 and a cylindrical surface. The anti-rotation surface 11 is recessed relative to the cylindrical surface connected in the circumferential direction and forms an anti-rotation surface 11 extending in the axial direction A. An anti-rotation stop wall 12 is formed between the anti-rotation surface 11 and the adjacent cylindrical surface. Figure 5 As shown, the wall of the sleeve 30 is radially recessed inward to form a concave platform 32. The shape of the concave platform 32 matches the shape of the anti-rotation surface 11. When the sleeve 30 is sleeved on the outside of the first shaft 10, as shown in FIG. Figure 6 and Figure 7 As shown, the recess 32 cooperates with the anti-rotation surface 11 of the first shaft, the recess 32 elastically abuts against the anti-rotation surface 11, and the two sides of the recess 32 in the circumferential direction W abut against the anti-rotation stop wall 12 of the anti-rotation surface 11, thereby realizing the anti-torsion connection between the sleeve 30 and the first shaft 10.

[0047] The coordinated design of the anti-rotation surface 11 and the recessed platform 32 restricts the rotation of the sleeve 30, achieving a torsion-resistant connection between the sleeve 30 and the first shaft 10 and ensuring effective torque transmission between them. The elastic contact between the recessed platform 32 and the anti-rotation surface 11 also increases the overall rigidity of the telescopic steering column shaft 100, improving the precision and stability of torque transmission while reducing friction and wear during torque transmission, thereby extending the service life of the telescopic steering column shaft 100 and enhancing its reliability.

[0048] In this embodiment, if Figure 4As shown, there are at least three anti-rotation surfaces 11 and they are arranged at equal intervals along the circumferential direction W. Correspondingly, as Figure 6 As shown, the sleeve 30 is also provided with at least three recesses 32 , the same number as the anti-rotation surface 11 , and the shapes and spacings of the recesses 32 are adapted to the anti-rotation surface 11 .

[0049] By providing at least three anti-rotation surfaces 11 and at least three recessed terraces 32 at equal intervals in the circumferential direction W, the stability of the torsional connection between the first shaft 10 and the sleeve 30 can be improved, ensuring a more secure torsional connection between the sleeve 30 and the first shaft 10. Furthermore, the coordinated arrangement of the at least three anti-rotation surfaces 11 and the recessed terraces 32 helps improve torque transmission, ensuring more uniform and stable torque transmission.

[0050] In some embodiments, the cross-sectional profiles of the concave platform 32 and the anti-rotation surface 11 match each other, for example, they can be flat, wavy, or triangular. Figure 5 and Figure 6 As shown, the cross-sectional profiles of the concave platform 32 and the anti-rotation surface 11 are planar. This planar design increases the contact area between the concave platform 32 and the anti-rotation surface 11, ensuring sufficient friction between the concave platform 32 of the sleeve 30 and the anti-rotation surface 11 of the first shaft 10. It also facilitates production and installation, and simplifies the manufacturing and assembly process.

[0051] In some embodiments, as Figure 5 As shown, the sleeve 30 is provided with an isolation hole 33 extending radially R through the wall, which serves to isolate the second anti-torsion guide 31 and the recess 32 in the circumferential direction W. During the production process, the isolation hole 33 facilitates stress balance during stamping, reduces the risk of material cracking, and improves the yield rate. By reducing the risk of material cracking, the reliability and service life of the steering column telescopic shaft 100 are improved. Furthermore, the isolation hole 33 provides space for the elastic deformation of the second anti-torsion guide 31 and the recess 32, facilitating the elastic deformation of the triangular second anti-torsion guide 31 and the planar recess 32 under pressure, thereby improving the overall stiffness of the steering column telescopic shaft 100 and the accuracy of torque transmission.

[0052] In summary, by providing a radially penetrating isolation hole 33 in the wall of the sleeve 30, not only the elastic deformation of the triangular second anti-torsion guide portion 31 and the planar recess 32 is promoted, but also the stress balance in the production process is improved, the risk of material rupture is reduced, and the overall performance and reliability of the steering column telescopic shaft 100 are improved.

[0053] like Figure 3As shown, the outer wall of the outer joint end of the first shaft 10 includes a cylindrical surface and an anti-rotation surface 11. The anti-rotation surface 11 divides the cylindrical surface into cylindrical segments at equal intervals along the circumferential direction. The cylindrical segments include a first cylindrical segment 131 and a second cylindrical segment 132 with different outer diameters along the axial direction A. Correspondingly, as Figure 5 As shown, the two ends of the sleeve 30 in the axial direction A include a first reduced diameter opening 34 and a second reduced diameter opening 35 with different inner diameters, which are respectively interference-fitted with the first cylindrical section 131 and the second cylindrical section 132 (as shown in FIG. Figure 7 ). The diameter of the first cylindrical section 131 is greater than the diameter of the second cylindrical section 132 . Correspondingly, the inner diameter of the first diameter-reducing opening 34 is greater than the inner diameter of the second diameter-reducing opening 35 .

[0054] The outer wall of the first shaft 10 comprises a cylindrical surface segment, and the inner diameters of the first and second reduced diameter openings 34, 35 of the sleeve 30, which cooperate therewith, are also circular. The interference fit between the first reduced diameter opening 34 and the first cylindrical surface segment 131, and the interference fit between the second reduced diameter opening 35 and the second cylindrical surface segment 132, limits the position of the sleeve 30 in the radial direction R, preventing movement of the sleeve 30 relative to the first shaft 10 in the radial direction R and improving the stability of the steering column telescopic shaft 100.

[0055] In some embodiments, as Figure 3 and Figure 7 As shown, an annular radial groove 14 is provided in the circumference W of the outer engaging end of the first shaft 10. The radial groove 14 is located on the side away from the non-outer engaging end described below. The steering column telescopic shaft 100 also includes a retaining ring 40, which is installed in the radial groove 14 and abuts against the axial end surface of the sleeve 30.

[0056] In addition, if Figure 3 As shown, the first shaft 10 also has a non-external engagement end. In this embodiment, the outer diameter of the non-external engagement end is larger than that of the external engagement end. Therefore, an axial retaining wall is formed between the non-external engagement end and the external engagement end. When the sleeve 30 is sleeved on the external engagement end of the first shaft 10, the other axial end surface of the sleeve 30 abuts against the axial retaining wall of the first shaft 10.

[0057] As can be seen, by providing an annular radial groove 14 in the circumferential direction W of the first shaft 10, installing a retaining ring 40 therein to abut against the axial end face of the sleeve 30, and having an axial retaining wall of the first shaft 10 abut against the other axial end face of the sleeve 30, the sleeve 30 is restrained in the axial direction A from both axial ends, thereby improving the axial positional accuracy of the sleeve 30 when assembled with the first shaft 10. Furthermore, when the second shaft 20 is sleeved outside the sleeve 30 and repeatedly moves axially relative to the sleeve 30 in the axial direction A, the retaining ring 40 and the axial retaining wall effectively prevent the sleeve 30 from moving in the axial direction A and from separating from the first shaft 10 under the influence of the second shaft 20, thereby improving the overall reliability, stability, and service life of the steering column telescopic shaft 100.

[0058] In some embodiments, as Figure 2 and Figure 8 As shown, the second shaft 20 may include an inner nesting tube 22 and an outer covering tube 23 .

[0059] The inner wall of the inner nested tube 22 forms the first anti-torsion guide portion 21 (such as Figure 8 the outer sleeve 23 is anti-torsionally sleeved on the outside of the inner nested tube 22, wherein the outer sleeve 23 is made of metal material and the inner nested tube 22 is made of PA66 material.

[0060] Among them, PA66 is the most mechanically strong and widely used variety in the PA series. Due to its high crystallinity, it has high rigidity and heat resistance. Polyamide resin, also known as polyamide in English, is abbreviated as PA and is commonly known as nylon. PA66 material is used and fused with the outer sleeve 23 through an injection molding process, with a toothed fit at the fusion point. Because the friction coefficient of PA66 material is lower than that of the sleeve 30 (steel), the friction generated by the mating surface between the second anti-torsion guide portion 31 of the sleeve 30 and the first anti-torsion guide portion 21 of the inner sleeve 22 is lower, which helps reduce noise. At the same time, the use of PA66 also achieves the overall lightweighting of the steering column telescopic shaft 100. Not only does it reduce friction and noise, but the use of lightweight materials also achieves lightweighting, improving overall performance and service life.

[0061] In some embodiments, as Figure 8 As shown, the outer wall of the inner nested tube 22 is provided with outer teeth 221; the inner wall of the outer sleeve 23 is provided with inner teeth 231, and the outer sleeve 23 and the inner nested tube 22 are anti-torsionally connected through the engagement of the inner teeth 231 with the outer teeth 221.

[0062] Through the meshing of the inner teeth 231 and the outer teeth 221, the connection friction between the outer sleeve 23 and the inner nested tube 22 is improved, the torsion-resistant connection between the outer sleeve 23 and the inner nested tube 22 is ensured, the structural stability of the second shaft 20 is improved, and the torque transmission performance when the second shaft 20 and the sleeve 30 are matched is ensured, avoiding the relative movement of the inner nested tube 22 and the outer sleeve 23 in the circumferential direction W during the torque transmission process, as well as vibration and noise during the torque transmission process.

[0063] Based on the same inventive concept, the present disclosure provides a vehicle including the above-mentioned telescopic steering column shaft 100. The specific manner in which the functions implemented in the vehicle in the above-mentioned embodiment are implemented has been described in detail in the embodiment of the telescopic steering column shaft 100 and will not be elaborated on here.

[0064] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0065] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A steering column telescopic shaft (100), characterized in that: include: a first shaft (10) having an outer engagement end; A second shaft (20), the second shaft (20) having a cylindrical inner engaging end, an inner wall of the inner engaging end being provided with an axially extending first anti-torsion guide portion (21); A sleeve (30) is anti-torsionally sleeved on the outer joint end of the first shaft (10); the sleeve (30) is provided with an axially extending second anti-torsion guide portion (31); the inner joint end of the second shaft (20) is sleeved on the outside of the sleeve (30); the main body section of the first anti-torsion guide portion (21) and the main body section of the second anti-torsion guide portion (31) have a substantially identical shape; and when the two shapes are engaged, the main body section of the second anti-torsion guide portion (31) is subjected to force to generate radial elastic deformation, so that the second shaft (20) can achieve circumferential (W) torque transmission and axial sliding relative to the first shaft (10).

2. The steering column telescopic shaft (100) according to claim 1, characterized in that The first anti-torsion guide portion (21) is an axially extending groove on the inner wall of the inner joint end of the second shaft (20), and the second anti-torsion guide portion (31) is a hollow boss formed by radially outward protrusion of the wall of the sleeve (30). When the second anti-torsion guide portion (31) is axially introduced into the first anti-torsion guide portion (21) and radially compressed, it can be elastically deformed radially inward and circumferentially on both sides.

3. The steering column telescopic shaft (100) according to claim 1, characterized in that: The second anti-torsion guide portion (31) has a triangular profile that is radially raised relative to the cylindrical surface.

4. The steering column telescopic shaft (100) according to claim 1, characterized in that The outer joint end of the first shaft (10) is provided with an axially extending anti-rotation surface (11), the anti-rotation surface (11) is recessed relative to the cylindrical surface connected in the circumferential direction, and an anti-rotation stop wall (12) is formed between the anti-rotation surface (11) and the connected cylindrical surface; The wall of the sleeve (30) is provided with a recessed platform (32) whose shape matches the anti-rotation surface (11); the recessed platform (32) elastically abuts against the anti-rotation surface (11); and both sides of the recessed platform (32) in the circumferential direction (W) abut against the anti-rotation stop wall (12), thereby realizing a torsion-resistant connection between the sleeve (30) and the first shaft (10).

5. The steering column telescopic shaft (100) according to claim 4, characterized in that: At least three anti-rotation surfaces (11) are provided and are arranged at equal intervals along the circumferential direction (W).

6. The steering column telescopic shaft (100) according to claim 4, characterized in that The wall of the sleeve (30) is provided with a radially (R) penetrating isolation hole (33) for isolating the second anti-torsion guide portion (31) and the concave platform (32) in the circumferential direction (W).

7. The steering column telescopic shaft (100) according to claim 1, characterized in that The outer joint end of the first shaft (10) has circumferentially spaced cylindrical segments, including a first cylindrical segment (131) and a second cylindrical segment (132) with different outer diameters in the axial direction. The axial ends of the sleeve (30) include a first reduced diameter opening (34) and a second reduced diameter opening (35) with different inner diameters, which are interference-fitted with the first cylindrical section (131) and the second cylindrical section (132) respectively.

8. The steering column telescopic shaft (100) according to claim 1, characterized in that An annular radial groove (14) is provided in the circumferential direction (W) of the first shaft (10). The steering column telescopic shaft (100) further comprises a retaining ring (40). The retaining ring (40) is installed in the radial groove (14) and abuts against the axial end face of the sleeve (30).

9. The steering column telescopic shaft (100) according to claim 2, characterized in that: The second shaft (20) comprises: an inner nested tube (22), wherein the inner wall of the inner nested tube (22) forms the first anti-torsion guide portion (21); The outer sleeve (23) is sleeved on the outside of the inner nested tube (22) in a torsion-resistant manner. The outer casing (23) is made of metal material, and the inner nesting tube (22) is made of PA66 material.

10. The steering column telescopic shaft (100) according to claim 9, characterized in that: The outer wall of the inner nested tube (22) is provided with external teeth (221); The inner wall of the outer sleeve (23) is provided with inner teeth (231), and the outer sleeve (23) and the inner nested tube (22) are connected to each other in an anti-torsion manner through the meshing of the inner teeth (231) and the outer teeth (221).

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