Mechanical steering column assembly

Abstract

A mechanical steering column assembly belongs to the technical field of steering columns and comprises a steering shaft mechanism, an adjusting mechanism and a fixed mounting mechanism, the fixed mounting mechanism is provided with two oppositely arranged side frames, the adjusting mechanism is provided with a column cylinder, the column cylinder is arranged between the two side frames, the middle position of the column cylinder is connected with the side frames through an adjusting rod, and the adjusting rod is connected with the steering shaft mechanism. The lower portion of the tubular column barrel is connected with the side frame through the rotating shaft, the side frame and the tubular column barrel are provided with long-strip-shaped holes used for angle adjustment of the tubular column barrel, the adjusting rod is movably arranged in the long-strip-shaped holes used for angle adjustment, the tubular column barrel is provided with long-strip-shaped holes allowing the rotating shaft to vertically move, and the rotating shaft is located below the adjusting rod. The clamping position of the tubular column casing does not coincide with the rotating connecting point, the clamping position is located in the middle, the clamping stability of the tubular column casing is effectively improved, the overall installation rigidity is guaranteed, the long-strip-shaped hole is formed, the machining difficulty is reduced, the machining precision is easier to control, and the angle adjusting flexibility of the tubular column casing is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of steering columns, in particular to a mechanical steering column assembly. Background Art

[0002] The steering column is an important component of the vehicle's steering system. It is a tubular shell connected to the vehicle body and equipped with a steering shaft. It has the key task of connecting the steering wheel and the steering gear and transmitting the driver's steering instructions to the wheels. Through the steering column, the driver can transmit the steering torque to the steering gear, thereby driving the vehicle to steer.

[0003] To meet the steering wheel operation requirements of users of different body shapes and driving habits, a manually adjustable steering column assembly (publication number CN118144861A) has been developed. It includes a steering shaft subassembly, a welded bracket subassembly, and an adjustment mechanism subassembly. The adjustment mechanism subassembly is connected to the welded bracket subassembly through an adjustment component. The column is locked and unlocked by changing the height of the adjustment block, achieving four-way adjustment of the column's up and down travel and fore and aft angle.

[0004] In the existing steering column assembly, the clamping position of the adjustment mechanism subassembly coincides with the installation position of the rotating shaft, and both are close to the lower position of the adjustment mechanism, resulting in poor clamping stability and insufficient installation rigidity. In addition, the position adjustment of the adjustment mechanism subassembly is achieved through the cooperation of the arc groove and the vertical groove. The arc groove is difficult to process and the processing accuracy is difficult to control. Moreover, the arc groove and the vertical groove are arranged relative to each other, and the curvature of the arc groove seriously limits the adjustment angle and direction of the adjustment mechanism subassembly, resulting in poor adjustment flexibility. Utility Model Content

[0005] In order to solve the technical problems of poor adjustment flexibility, poor clamping stability and insufficient installation rigidity of the existing steering column assembly in the above background technology, the utility model provides a mechanical steering column assembly.

[0006] The technical solution of this utility model is as follows:

[0007] The utility model provides a mechanical steering column assembly, including a steering shaft mechanism, the steering shaft mechanism is connected to a fixed installation mechanism through an adjustment mechanism, the fixed installation mechanism is provided with a fixed bracket, two oppositely arranged side frames are fixedly installed on the fixed bracket, the adjustment mechanism is provided with a column tube, the column tube is arranged between the two side frames, the middle position of the column tube is connected to the side frames on both sides thereof through an adjustment rod, a handle and a locking cam are installed on the adjustment rod, the handle controls the side frames to clamp the column tube through the locking cam, the lower position of the column tube is connected to the side frames on both sides thereof through a rotating shaft, and the side frames and The column tube is provided with a long hole for adjusting the angle of the column tube, and the adjusting rod is movably arranged in the long hole for angle adjustment. The column tube is provided with a long hole for allowing the vertical movement of the rotating shaft, and the rotating shaft is located below the adjusting rod. The clamping position of the column tube does not coincide with the rotating connection point, and the clamping position of the column tube is located in the middle part, which effectively improves the clamping stability of the column tube and ensures the overall installation rigidity. In addition, the setting of the long hole reduces the processing difficulty and the processing accuracy is easier to control, which makes the angle adjustment of the column tube more flexible and meets the needs of ergonomics.

[0008] Preferably, a first connecting hole and a second connecting hole are provided on the side frame, the first connecting hole is a long hole arranged obliquely downward, and the second connecting hole is a round hole. The second connecting hole is located below the first connecting hole, the adjusting rod is arranged in the first connecting hole, and the rotating shaft is arranged in the second connecting hole, so that the adjusting shaft can move obliquely along the first connecting hole, and at the same time limit the position of the rotating shaft to facilitate the adjustment of the angle of the pipe column.

[0009] Preferably, the tubular tube is provided with a first adjustment hole and a second adjustment hole arranged up and down, the first adjustment hole and the second adjustment hole are both vertically arranged long holes, the first adjustment hole and the first connecting hole are connected by an adjusting rod, the first adjustment hole intersects with the first connecting hole, and the second adjustment hole and the second connecting hole are connected by a rotating shaft, and the coordinated use of the first adjustment hole, the first connecting hole and the second adjustment hole enables the tubular tube to be adjusted in height and inclination angle relative to the side frame, thereby ensuring the flexibility of adjustment of the tubular tube.

[0010] Preferably, a pull plate is provided at one end of the adjusting rod, and a handle and a locking cam are installed at the other end. A limit nut is threadedly connected to the adjusting rod, and the limit nut is located on the side of the handle away from the locking cam. The pull plate is used to assist the tightening work of the locking cam, and the limit nut plays a limiting role to limit the position of the handle.

[0011] Preferably, the locking cam is sleeved on the adjusting rod, and a plurality of arc-shaped bosses are fixedly provided on the end face of one end of the locking cam along its circumferential intervals, and a plurality of connecting grooves are provided on the handle, and the shape and cross-sectional size of the connecting grooves match the bosses, and the connecting grooves correspond to the bosses one-to-one, so that the driving control of the locking cam by the handle is realized through the cooperation of the connecting grooves and the bosses.

[0012] Preferably, a first fitting surface is provided between two adjacent bosses, and a second fitting surface is provided on the bosses. The height of the first fitting surface is lower than the second fitting surface. Both the first fitting surface and the second fitting surface are used to fit with the handle. By using different fitting surfaces, the locking cam can be driven by rotating the handle.

[0013] Preferably, an inclined transition surface is provided between the first fitting surface and the adjacent second fitting surface, so as to facilitate switching between the first fitting surface and the second fitting surface by rotating the handle.

[0014] Preferably, a limiting portion is fixedly provided on the boss, and the limiting portion is located on a side of the second fitting surface away from the first fitting surface. The height of the limiting portion is higher than the second fitting surface to limit the rotation angle of the handle.

[0015] Preferably, the steering shaft mechanism includes a steering shaft, which is rotatably installed in the barrel portion of the column barrel. The lower end of the steering shaft is connected to a telescopic shaft through a universal joint, and the upper end of the steering shaft is connected to the steering wheel. The upper end of the steering shaft is a tapered end, and the steering wheel contains a tapered surface that cooperates with the tapered end, thereby increasing the contact area and preventing relative shaking between the steering wheel and the steering shaft.

[0016] Preferably, positioning grooves are provided on the upper and lower ends of the universal joint, the lower end of the steering shaft and the upper end of the telescopic shaft. The cooperation of the positioning grooves enables rapid positioning and installation between the steering shaft, the telescopic shaft and the universal joint.

[0017] It can be seen from the above technical solutions that the advantages of the present invention are:

[0018] 1. The tubular column is connected to the side frame through a rotating shaft and an adjusting rod. The rotating shaft is located below the adjusting rod. The clamping position of the tubular column does not coincide with the rotation connection point, and the clamping position of the tubular column is located in the middle part, which effectively improves the clamping stability of the tubular column and ensures the overall installation rigidity. In addition, the setting of the long hole reduces the processing difficulty and makes the processing accuracy easier to control, making the angle adjustment of the tubular column more flexible and meeting the requirements of ergonomics.

[0019] 2. A first connecting hole and a second connecting hole are provided on the side frame. The first connecting hole is a long hole arranged obliquely downward. A first adjusting hole and a second adjusting hole are provided on the pipe column tube up and down. The first adjusting hole and the second adjusting hole are both long holes arranged vertically. The first adjusting hole and the first connecting hole are connected by an adjusting rod. The first adjusting hole intersects with the first connecting hole. The second adjusting hole and the second connecting hole are connected by a rotating shaft. The coordinated use of the first adjusting hole, the first connecting hole and the second adjusting hole enables the pipe column tube to be adjusted in height and inclination angle relative to the side frame, thereby ensuring the flexibility of adjustment of the pipe column tube.

[0020] 3. A first fitting surface is provided between two adjacent bosses, and a second fitting surface is provided on the bosses. The height of the first fitting surface is lower than the second fitting surface. Both the first fitting surface and the second fitting surface are used to fit with the handle. By using different fitting surfaces, the locking cam is driven by rotating the handle. An inclined transition surface is provided between the first fitting surface and the adjacent second fitting surface to facilitate the switching of the handle between the first fitting surface and the second fitting surface.

[0021] 4. Positioning grooves are provided on the upper and lower ends of the universal joint, the lower end of the steering shaft and the upper end of the telescopic shaft. The coordination of the positioning grooves enables quick positioning and installation between the steering shaft, telescopic shaft and universal joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 Schematic side view of a mechanical steering column assembly according to one or more embodiments of the present invention;

[0024] Figure 2 This is a schematic diagram of the main structure of a mechanical steering column assembly according to one or more embodiments of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the steering shaft, telescopic shaft and universal joint according to one or more embodiments of the present invention;

[0026] Figure 4 This is a schematic diagram of a partial cross-sectional structure of the connection between a steering wheel and a steering shaft according to one or more embodiments of the present invention;

[0027] Figure 5 This is a schematic structural diagram of a locking cam according to one or more embodiments of the present invention;

[0028] Figure 6 This is a schematic structural diagram of a handle according to one or more embodiments of the present invention;

[0029] Figure 7 This is a schematic structural diagram of a side frame according to one or more embodiments of the present invention;

[0030] Figure 8 This is a schematic structural diagram of a tubing column according to one or more embodiments of the present invention;

[0031] The components represented by the reference numerals in the figure are:

[0032] 1. Steering shaft mechanism; 2. Adjustment mechanism; 3. Fixed installation mechanism; 4. Steering shaft; 5. Universal joint; 6. Telescopic shaft; 7. Steering wheel; 8. Locking nut; 9. Washer; 10. Conical surface; 11. Column tube; 12. Handle; 13. Adjustment rod; 14. Pull plate; 15. Rotating shaft; 16. Boss; 17. First fitting surface; 18. Second fitting surface; 19. Limiting part; 20. Connecting groove; 21. Side frame; 22. First connecting hole; 23. Second connecting hole; 24. Third connecting hole; 25. First adjusting hole; 26. Second adjusting hole; 27. Fixing bracket; 28. Wiring harness bracket; 29. ​​Limiting nut. DETAILED DESCRIPTION

[0033] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0034] In a typical embodiment of the present invention, Figures 1-8 As shown, a mechanical steering column assembly is proposed, including: a steering shaft mechanism 1, an adjustment mechanism 2 and a fixed installation mechanism 3. The steering shaft mechanism 1 is connected to the fixed installation mechanism 3 through the adjustment mechanism 2. The steering shaft mechanism 1 is rotatably connected to the adjustment mechanism 2 through a bearing. The adjustment mechanism 2 can adjust the relative position relationship with the fixed installation mechanism 3 to change the position of the steering shaft mechanism 1. The fixed installation mechanism 3 is used to be fixedly connected to the front panel of the cab.

[0035] like Figure 1 and Figure 2 As shown, the fixed installation mechanism 3 includes a side frame 21, a fixed bracket 27 and a wire harness bracket 28, wherein two side frames 21 are provided, the two side frames 21 are arranged opposite to each other and are fixedly mounted on the fixed bracket 27 by welding or the like, and the fixed bracket 27 is used to be fixedly connected to the front panel of the cab by bolts, and there is a space for installing the adjustment mechanism 2 between the two side frames 21, and the two side frames 21 are connected by a connecting shaft, and the wire harness bracket 28 is fixedly mounted on the side frame 21 for limiting the installation of the wire harness and improving the aesthetics of the wire harness layout.

[0036] like Figure 7As shown, the side frame 21 is a concave structure, and a first connecting hole 22, a second connecting hole 23 and a third connecting hole 24 are provided on the side frame 21. The first connecting hole 22 is a long hole structure arranged obliquely downward, and the second connecting hole 23 is a circular hole structure. The second connecting hole 23 is located below the first connecting hole 22. The first connecting hole 22 and the second connecting hole 23 are both used for connection with the adjustment mechanism 2. The third connecting hole 24 is located on one side of the second connecting hole 23 for the installation of the connecting shaft, and the two side frames 21 are fixedly connected together through the connecting shaft.

[0037] The adjusting mechanism 2 includes a tubular barrel 11 and a clamping adjustment assembly. The clamping adjustment assembly includes a handle 12, an adjusting rod 13, a rotating shaft 15, a locking cam and a limit nut 29. The tubular barrel 11 is arranged between the two side frames 21. The middle position of the tubular barrel 11 is connected to the side frames 21 on both sides through the adjusting rod 13. The handle 12 and the locking cam are installed on the adjusting rod 13. The handle 12 and the locking cam are located on the outside of the side frame 21. The handle 12 is used to control the locking cam to tighten the side frame 21 so as to use the two side frames 21 to clamp the tubular barrel 11. The lower position of the tubular barrel 11 is connected to the side frames 21 on both sides through the rotating shaft 15.

[0038] like Figure 8 As shown, the column tube 11 includes a tube portion and a connecting portion, the tube portion and the connecting portion are fixedly connected together, the tube portion is used to connect with the steering shaft mechanism 1, and a first adjustment hole 25 and a second adjustment hole 26 are opened on the connecting portion, the first adjustment hole 25 and the second adjustment hole 26 are both vertically arranged long hole structures, the first adjustment hole 25 is located above the second adjustment hole 26, the first adjustment hole 25 is arranged opposite to the first connecting hole 22 on the side frame 21, the first adjustment hole 25 intersects with the first connecting hole 22, and the first adjustment hole 25 and the first connecting holes 22 on both sides of the first adjustment hole 25 are connected by an adjusting rod 13; the second adjustment hole 26 and the second connecting hole 23 are arranged opposite to each other, and the second adjustment hole 26 and the second connecting holes 23 on both sides of the second adjustment hole are connected by a rotating shaft 15.

[0039] The adjusting rod 13 is a threaded rod structure, and both ends of the adjusting rod 13 extend outward from the side frames 21. A pull plate 14 is fixed to one end of the adjusting rod 13, and the other end of the adjusting rod 13 is connected to a locking cam and a handle 12 in sequence. The handle 12 is threadedly connected to the adjusting rod 13. The handle 12 can drive the locking cam to move axially along the adjusting rod 13, and then control the distance between the two side frames 21 through the cooperation of the locking cam and the pull plate 14, thereby realizing the clamping control of the pipe column 11. A limit nut 29 is also threadedly connected to the adjusting rod 13, and the limit nut 29 is located on the side of the handle 12 away from the locking cam.

[0040] It should be noted that the size of the pulling plate 14 should be larger than the width of the first connecting hole 22 on the side frame 21 to ensure that the pulling plate 14 can effectively pull the side frame 21 to move.

[0041] The locking cam is sleeved on the adjusting rod 13. Figure 5 As shown, a plurality of arc-shaped bosses 16 are fixedly provided on the end face of one end of the locking cam at intervals along its circumferential direction so as to cooperate with the handle 12 through the bosses 16, and a first fitting surface 17 is provided between two adjacent bosses 16, and a second fitting surface 18 is provided on the boss 16. The height of the first fitting surface 17 is lower than the height of the second fitting surface 18, and an inclined transition surface is provided between the first fitting surface 17 and the adjacent second fitting surface 18. A limiting portion 19 is also fixedly provided on the boss 16, and the height of the limiting portion 19 is higher than the second fitting surface 18. The limiting portion 19 is located on the side of the second fitting surface 18 away from the first fitting surface 17.

[0042] like Figure 6 As shown, the handle 12 is provided with a plurality of connecting grooves 20, which are arc-shaped groove structures. The number of the connecting grooves 20 is the same as that of the boss 16 and corresponds one to one. The shape and cross-sectional size of the connecting grooves 20 match those of the boss 16. When the boss 16 is fully inserted into the connecting groove 20, the handle 12 is in contact with the first fitting surface 17, the handle 12 does not push the locking cam, and the locking cam does not push the side frame 21 to clamp the tubular column 11; when the handle 12 is rotated so that the handle 12 is in contact with the second fitting surface 18 on the boss 16, the handle 12 pushes the locking cam to move, and the locking cam pushes the side frame 21 to clamp the tubular column 11. The limit portion 19 is used to limit the rotation angle of the handle 12.

[0043] In this embodiment, the rotating shaft 15 is located below the adjusting rod 13, the clamping position of the pipe column tube 11 does not coincide with the rotation connection point, and the clamping position of the pipe column tube 11 is located in the middle part thereof, which effectively improves the clamping stability of the pipe column tube 11 and ensures the overall installation rigidity; in addition, the first adjusting hole 25, the first connecting hole 22 and the second adjusting hole 26 are all long hole structures, which reduces the processing difficulty and makes the processing accuracy easier to control, and the cross-cooperation mode of the first adjusting hole 25 and the first connecting hole 22 makes the angle adjustment range of the pipe column tube 11 larger and more flexible, which meets the requirements of ergonomics.

[0044] The steering shaft mechanism 1 includes a steering shaft 4, a universal joint 5 and a telescopic shaft 6. The steering shaft 4 is rotatably installed in the barrel portion of the column barrel 11. The lower end of the steering shaft 4 is connected to the telescopic shaft 6 through the universal joint 5, and the upper end of the steering shaft 4 is connected to the steering wheel 7.

[0045] like Figure 3 As shown, positioning grooves are provided at the upper and lower ends of the universal joint 5, and positioning grooves are provided at the lower end of the steering shaft 4 and the upper end of the telescopic shaft 6. Through the cooperation of the positioning grooves, rapid positioning and installation between the steering shaft 4, the telescopic shaft 6 and the universal joint 5 can be achieved.

[0046] like Figure 4As shown, the upper end of the steering shaft 4 is a tapered end, and the steering wheel 7 has a tapered surface 10. The steering shaft 4 cooperates with the tapered surface 10 of the steering wheel 7 through the tapered end to increase the contact area and prevent relative shaking between the steering wheel 7 and the steering shaft 4. The steering shaft 4 and the steering wheel 7 are also fixed by a locking nut 8 and a washer 9.

[0047] The specific adjustment principle is:

[0048] When it is necessary to adjust the position of the steering shaft mechanism, the handle 12 is turned so that the boss 16 is completely inserted into the connecting groove 20, the handle 12 is in contact with the first fitting surface 17, the handle 12 does not push the locking cam, and the locking cam does not push the side frame 21 to loosen the tubular column 11. When it is only necessary to adjust the vertical position of the tubular column 11, the tubular column 11 is directly pulled to move vertically, the first adjustment hole 25 and the adjustment rod 13 move relative to each other in the vertical direction, and the second adjustment hole 26 and the rotating shaft 15 move relative to each other in the vertical direction; when it is necessary to adjust the spatial position of the tubular column 11 (including the angle or the synchronous adjustment of the angle and height), the tubular column 11 is directly pulled to move, and at this time the adjusting rod 13 moves along the first connecting hole 22, the first adjustment hole 25 and the adjustment rod 13 move relative to each other in the vertical direction, and the second adjustment hole 26 and the rotating shaft 15 move relative to each other in the vertical direction;

[0049] When the position adjustment of the tubing column 11 is completed, the handle 12 is rotated so that the handle 12 fits the second fitting surface 18 on the boss 16 , and the handle 12 pushes the locking cam to move. The locking cam cooperates with the pull plate 14 to push the side frame 21 to clamp the tubing column 11 .

[0050] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical steering column assembly, comprising: A steering shaft mechanism (1) is connected to a fixed mounting mechanism (3) via an adjusting mechanism (2), wherein the fixed mounting mechanism (3) is provided with a fixed bracket (27), two oppositely arranged side frames (21) are fixedly mounted on the fixed bracket (27), the adjusting mechanism (2) is provided with a column tube (11), the column tube (11) is arranged between the two side frames (21), the middle position of the column tube (11) is connected to the side frames (21) on both sides thereof via an adjusting rod (13), and the adjusting rod (1 3) is provided with a handle (12) and a locking cam, the handle (12) controls the side frame (21) to clamp the column barrel (11) through the locking cam, the lower position of the column barrel (11) is connected to the side frames (21) on both sides thereof through the rotating shaft (15), and a long hole for adjusting the angle of the column barrel (11) is provided on the side frame (21) and the column barrel (11), and the adjusting rod (13) is movably arranged in the long hole for angle adjustment, and the column barrel (11) is also provided with a long hole for allowing the rotating shaft (15) to move vertically.

2. The mechanical steering column assembly according to claim 1, characterized in that: A first connecting hole (22) and a second connecting hole (23) are provided on the side frame (21). The first connecting hole (22) is a long hole arranged obliquely downward, and the second connecting hole (23) is a round hole. The second connecting hole (23) is located below the first connecting hole (22). The adjusting rod (13) is arranged in the first connecting hole (22), and the rotating shaft (15) is arranged in the second connecting hole (23).

3. The mechanical steering column assembly according to claim 2, characterized in that: The column tube (11) is provided with a first adjustment hole (25) and a second adjustment hole (26) arranged vertically. The first adjustment hole (25) and the second adjustment hole (26) are both vertically arranged long holes. The first adjustment hole (25) and the first connecting hole (22) are connected by an adjustment rod (13). The first adjustment hole (25) and the first connecting hole (22) intersect with each other. The second adjustment hole (26) and the second connecting hole (23) are connected by a rotating shaft (15).

4. The mechanical steering column assembly according to claim 1, characterized in that: One end of the adjusting rod (13) is provided with a pull plate (14), and the other end is provided with a handle (12) and a locking cam. The adjusting rod (13) is threadedly connected to a limit nut (29), and the limit nut (29) is located on the side of the handle (12) away from the locking cam.

5. The mechanical steering column assembly according to claim 1, characterized in that: The locking cam is sleeved on the adjusting rod (13), and one end of the locking cam is fixedly provided with a plurality of arc-shaped bosses (16) at intervals along the circumference thereof. The handle (12) is provided with a plurality of connecting grooves (20), and the shape and cross-sectional dimensions of the connecting grooves (20) match those of the bosses (16), and the connecting grooves (20) correspond to the bosses (16) one by one.

6. The mechanical steering column assembly according to claim 5, characterized in that: A first fitting surface (17) is provided between two adjacent bosses (16), and a second fitting surface (18) is provided on the boss (16). The height of the first fitting surface (17) is lower than that of the second fitting surface (18). Both the first fitting surface (17) and the second fitting surface (18) are used to fit with the handle (12).

7. The mechanical steering column assembly according to claim 6, characterized in that: An inclined transition surface is provided between the first fitting surface (17) and the adjacent second fitting surface (18).

8. The mechanical steering column assembly according to claim 6, characterized in that: A limiting portion (19) is fixedly provided on the boss (16), and the limiting portion (19) is located on a side of the second fitting surface (18) away from the first fitting surface (17), and the height of the limiting portion (19) is higher than that of the second fitting surface (18).

9. The mechanical steering column assembly according to claim 1, characterized in that: The steering shaft mechanism (1) includes a steering shaft (4), which is rotatably mounted in a cylindrical portion of a column cylinder (11), wherein the lower end of the steering shaft (4) is connected to a telescopic shaft (6) via a universal joint (5), and the upper end of the steering shaft (4) is connected to a steering wheel (7). The upper end of the steering shaft (4) is a tapered end, and the steering wheel (7) includes a tapered surface (10) that matches the tapered end.

10. The mechanical steering column assembly according to claim 9, characterized in that: Positioning grooves are provided at the upper end and the lower end of the universal joint (5), the lower end of the steering shaft (4), and the upper end of the telescopic shaft (6).

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