Electric adjusting steering column with long adjusting stroke

Abstract

The utility model relates to an electric adjusting steering column with a long adjusting stroke. An inner column pipe assembly, an outer column pipe and an aluminum cast pipe are sequentially arranged from inside to outside, a length adjusting mechanism and an angle adjusting mechanism are installed on the aluminum cast pipe, a length adjusting motor of the length adjusting mechanism is connected with the aluminum cast pipe, the output end of the length adjusting motor drives a first lead screw and a second lead screw to rotate, a first adjusting nut is arranged on the first lead screw in a sleeving mode, and a second adjusting nut is arranged on the second lead screw. The first adjusting nut is clamped between the first length adjusting and maintaining support assembly and the length adjusting support assembly, the length adjusting support assembly is connected with the inner column pipe, the second lead screw is sleeved with the second adjusting nut, the second adjusting nut is connected with the second length adjusting and maintaining support assembly, and the second lead screw is sleeved with the second adjusting nut. And the second length adjusting and keeping bracket assembly is connected with the aluminum cast pipe. The three-section pipe telescopic mechanism is adopted, the inner column pipe assembly stretches out and draws back relative to the outer column pipe, the outer column pipe stretches out and draws back relative to the aluminum cast pipe, and therefore the length of the steering wheel can be adjusted in a large range, and the steering wheel storage function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steering columns, in particular to an electrically adjustable steering column with a long adjustment stroke. Background Art

[0002] The steering column is a crucial component of the vehicle's steering system, playing a vital role in ensuring steering safety and providing a comfortable driving experience for all drivers. The adjustment form and range of the steering column play a significant role. Current steering columns have a limited adjustment range, making them unsuitable for all drivers. Furthermore, they lack the ability to stow the steering wheel, failing to meet the space requirements of intelligent driving cabins.

[0003] like Figure 9 As shown in the patent application, application number 202222057019.2 is entitled "A Steering-by-Wire Long-Stroke Adjustable Steering Column." The steering column length adjustment structure includes a steering column housing 100, an inner column tube 200 mounted within the steering column housing 100 for telescopic movement relative to the steering column housing, a length adjustment motor 300, a length adjustment bracket 400, and an energy-absorbing sheet 500. The length adjustment motor 300 is fixed to the steering column housing 100 and connected to the length adjustment bracket 400 via a lead screw 600 and a nut 700. The energy-absorbing sheet 500 is connected to the inner column tube 200, and the length adjustment bracket is connected to the energy-absorbing sheet. When the length needs to be adjusted, the length adjustment motor drives the energy-absorbing sheet through the length adjustment bracket, which in turn drives the inner column tube to extend and retract within the steering column housing, thereby adjusting the length of the steering column. However, due to the length limitation of the inner column tube's extended end, the adjustable length of the inner column tube is limited to a range of ±30 mm.

[0004] like Figure 10 As shown in the patent application, application number 202111614112.2 is entitled "An Electric Steering Column Angle Adjustment Device for Automobiles." The angle adjustment mechanism comprises an angle adjustment motor 100, an angle adjustment assembly, an angle adjustment bracket 200, and an angle adjustment retaining bracket 300. The angle adjustment assembly includes a flexible shaft 400, an angle adjustment screw 500, a bearing seat 600, a screw support pin 700, a nut holder 800, an angle limiter 900, and other components. The device has a large number of components, a complex structure, and a difficult manufacturing process. Due to spatial limitations, it is impossible to ensure that the angle adjustment assembly and the angle adjustment motor are in a straight line during layout. Because the angle adjustment motor is fixed to the bracket, the angle adjustment motor remains stationary during angle adjustment. The angle of the angle adjustment assembly relative to the angle adjustment motor changes with the steering column adjustment angle. The change in the angle adjustment load force causes the force on the flexible shaft to change, which in turn causes the speed of the angle adjustment motor to change. This changes the sound quality and pitch of the angle adjustment motor, resulting in an annoying sound that reduces driver comfort. Summary of the Invention

[0005] The purpose of the utility model is to provide an electrically adjustable steering column with a long adjustment stroke. The steering column has a large length adjustment range and can provide a larger space for the driver.

[0006] The technical solution of this utility model:

[0007] A long-adjustment-stroke electric adjustment steering column comprises an inner column tube assembly, an outer column tube, an aluminum cast tube, a length adjustment mechanism and an angle adjustment mechanism. The outer column tube is sleeved on the outside of the inner column tube assembly, the aluminum cast tube is sleeved on the outside of the outer column tube, and the length adjustment mechanism and the angle adjustment mechanism are installed on the side of the aluminum cast tube. The length adjustment mechanism comprises a length adjustment motor, a first lead screw, a first adjusting nut, a second lead screw, a second adjusting nut, a length adjustment bracket assembly, a first length adjustment retaining bracket assembly and a second length adjustment retaining bracket assembly. The length adjustment motor is connected to the outer column tube, and the output ends of the length adjustment motor are respectively connected to the first lead screw and the second lead screw to drive the first lead screw and the second lead screw to rotate. The first adjusting nut is sleeved on the first lead screw, and the first adjusting nut is clamped between the first length adjustment retaining bracket assembly and the length adjustment bracket assembly. The length adjustment bracket assembly is connected to the inner column tube, the second adjusting nut is sleeved on the second lead screw, the second adjusting nut is connected to the second length adjustment retaining bracket assembly, and the second length adjustment retaining bracket assembly is connected to the aluminum cast tube.

[0008] The length adjustment bracket assembly includes a collapse slider, a rivet, a length adjustment bracket, and a length guide bolt sleeve. A collapse groove is opened on the inner column tube assembly, and the collapse slider is provided with a boss, which is interference-pressed into the collapse groove on the inner column tube assembly. The rivets are tightened through the circular holes on the collapse slider and the inner column tube assembly respectively. The length adjustment bracket is connected to the collapse slider bolt through the long groove opened on the side wall of the aluminum cast tube, and the length guide bolt sleeve is connected to the length adjustment bracket by bolts.

[0009] The first length adjustment holding bracket assembly includes a first length adjustment holding bracket and a bolt, the first length adjustment holding bracket is connected to the length adjustment bracket through the bolt, the first adjustment nut is placed between the first length adjustment holding bracket and the length adjustment bracket, and the first length adjustment holding bracket and the length adjustment bracket clamp the first adjustment nut.

[0010] The second length adjustment retaining bracket assembly includes a second length adjustment retaining bracket, a bolt and a connecting bracket. The connecting bracket is fixed on the aluminum cast pipe. The second length adjustment retaining bracket and the connecting bracket are connected by bolts. The second adjustment nut is placed between the second length adjustment retaining bracket and the connecting bracket. The second adjustment nut is clamped between the second length adjustment retaining bracket and the connecting bracket.

[0011] The length adjustment motor is connected to the outer column tube through the length adjustment motor bracket assembly. The length adjustment motor bracket assembly includes a guide sleeve, a guide block, a length adjustment motor bracket, and a bolt. The guide sleeve is interference fit onto the guide block. The length adjustment motor bracket is fixed to the guide block, the guide sleeve and the outer column tube through a bolt connection. At the same time, the open circular groove of the length adjustment motor bracket is matched with the boss on the length adjustment motor for installation.

[0012] A bushing is provided between the inner column tube assembly and the outer column tube. The bushing has irregularly arranged circular holes, and steel balls are pressed into the circular holes. The bushing and the steel balls are combined into a steel ball sliding pair, which is assembled between the inner column tube assembly and the outer column tube.

[0013] The angle adjustment mechanism includes an angle adjustment motor, an angle adjustment bracket, an angle adjustment holding bracket, a bracket, and a sliding plate. The angle adjustment motor is installed on an aluminum cast tube by bolts. The output end of the angle adjustment motor is connected to the angle adjustment screw. The angle adjustment screw is provided with an angle adjustment nut. One end of the aluminum cast tube is hingedly connected to the angle adjustment movable bracket, and the other end is hingedly connected to the bracket. A V-shaped groove is provided on the side of the side where the bracket is connected to the angle adjustment bracket. The bolt passes through the sliding plate bolt bushing, the sliding plate and the light hole in the center of the V-shaped groove of the bracket and is connected to the angle adjustment bracket. The bracket is clamped, and the pre-tightened plastic block is interference-pressed onto the angle adjustment bracket. The other side rests on the bracket. The angle adjustment holding bracket is bolted to the angle adjustment bracket, and the angle adjustment nut is clamped between the angle adjustment holding bracket and the angle adjustment bracket.

[0014] The bracket is provided with mounting holes on both sides of one end connected to the aluminum cast pipe, and a rotating bolt bushing is installed in the mounting hole. The rotating bolt is inserted into the rotating bolt bushing to connect the aluminum cast pipe and the bracket; the mounting holes on both sides of the angle adjustment bracket are provided with rotating bolt bushings, and the rotating bolt is inserted into the rotating bolt bushing to connect the aluminum cast pipe and the angle adjustment bracket.

[0015] A mounting seat is fixed to the side of the aluminum cast tube, and a bolt hole is opened on the mounting seat. The screw of the fixing bolt is divided into an external thread section at the front end and a polished rod section between the nut and the external thread section. The fixing bolt passes through the hole on the angle adjustment motor, and the external thread section at the front end is threadedly connected to the mounting seat, and the polished rod section cooperates with the hole on the angle adjustment motor.

[0016] Beneficial effects of the utility model:

[0017] 1. The length adjustment mechanism of this application utilizes a three-section tube telescopic mechanism. The inner column tube assembly telescopes relative to the outer column tube, and the outer column tube telescopes relative to the aluminum cast tube, thereby enabling wide-range adjustment of the steering wheel length and achieving the steering wheel storage function. Compared with conventional length adjustment mechanisms, this application has a shorter overall length for the same adjustment distance and occupies less space in the vehicle. Simultaneously, two lead screws operate simultaneously, causing the inner column tube assembly to telescope and the outer column tube to drive the inner column tube to telescope, resulting in faster telescopic adjustment.

[0018] 2. Compared with the angle adjustment mechanism in traditional technology, the steering wheel angle adjustment mechanism of the present application is simpler in structure and has fewer parts. At the same time, it optimizes the annoying sound problems generated during the angle adjustment process, such as adjustment sound changes, cyclic sounds, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of the long-adjustment-stroke electrically adjustable steering column in this application.

[0021] Figure 2 This is a schematic diagram of the overall structure of another angle of the long adjustment stroke electrically adjustable steering column in this application.

[0022] Figure 3 This is a top view of the long-adjustment-stroke electrically adjustable steering column for this application.

[0023] Figure 4 Side view of the electrically adjustable steering column with long adjustment travel for this application.

[0024] Figure 5 Cross-section of the electrically adjustable steering column with long adjustment stroke for this application.

[0025] Figure 6 This is an exploded view of the length adjustment mechanism of this application.

[0026] Figure 7 This is the exploded view of the angle adjustment mechanism of this application.

[0027] Figure 8 This is a partial enlarged view of the angle adjustment mechanism of this application.

[0028] Figure 9 It is a structural diagram of the steering column length adjustment part in the prior art.

[0029] Figure 10This is a schematic diagram of the steering column angle adjustment structure in the prior art.

[0030] Reference numerals:

[0031] Inner column tube assembly 1; outer column tube 2; aluminum cast tube 3; long slot 31; length adjustment mechanism 4; angle adjustment mechanism 5; bushing 6; steel ball 61; length adjustment motor 401; first lead screw 402; first adjustment nut 403; second lead screw 404; second adjustment nut 405; collapse slider 406; rivet 407; length adjustment bracket 408; length guide bolt sleeve 409; boss 410; first length adjustment retaining bracket 411; second length adjustment retaining bracket 412; connecting bracket 413; guide sleeve 414; guide block 415; length adjustment motor bracket 416; bolt 417; slide groove 418; connector 419; angle adjustment motor 501; angle adjustment bracket 502; angle adjustment retaining bracket 503; bracket 504; sliding plate 505; angle adjustment screw 506; sliding plate bolt bushing 507; pre-tightening plastic block 508; rotating bolt bushing 509; rotating bolt 510; mounting seat 511; angle adjustment nut 512; fixing bolt 513; V-groove 514; mounting hole 515. DETAILED DESCRIPTION

[0032] In order to solve the problems in the background technology, the present invention has invented an electrically adjustable steering column with a long adjustment stroke, which can adjust the length and angle of the steering column to provide the driver with a more comfortable driving experience.

[0033] It should be noted that, in the description of this application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

[0034] A long-adjustment-stroke electrically adjustable steering column comprises an inner column tube assembly 1, an outer column tube 2, an aluminum cast tube 3, a length adjustment mechanism 4, and an angle adjustment mechanism 5. The outer column tube 2 is sleeved onto the outer column tube assembly 1, the aluminum cast tube is sleeved onto the outer column tube, and the length adjustment mechanism and angle adjustment mechanism are mounted on the side of the aluminum cast tube. The length adjustment mechanism 4 comprises a length adjustment motor 401, a first lead screw 402, a first adjustment nut 403, a second lead screw 404, a second adjustment nut 405, a length adjustment bracket assembly, a first length adjustment retaining bracket assembly, and a second length adjustment retaining bracket assembly. The length adjustment motor 401 is connected to the outer column tube 2, and the output end of the length adjustment motor 401 is respectively connected to the first lead screw 402 and the second lead screw 404, driving the first and second lead screws to rotate. The first adjustment nut 403 is sleeved onto the first lead screw 402 and is sandwiched between the first length adjustment retaining bracket assembly and the length adjustment bracket assembly. The length adjustment bracket assembly is connected to the inner column tube. The second adjusting nut 403 is sleeved on the second lead screw 404 . The second adjusting nut 403 is connected to the second length adjusting and holding bracket assembly. The second length adjusting and holding bracket assembly is connected to the aluminum casting pipe.

[0035] The length adjustment bracket assembly includes a crush slide 406, a rivet 407, a length adjustment bracket 408, and a length guide bolt sleeve 409. The inner column tube assembly is provided with a crush chute. The crush slide has a boss 410, which is press-fitted into the crush chute. The rivet 407 is tightened through circular holes in the crush slide and inner column tube assembly, respectively. The length adjustment bracket 408 is bolted to the crush slide 406 through the elongated slot 31 in the sidewall of the aluminum cast tube. The length guide bolt sleeve 409 is bolted to the length adjustment bracket 408 and provides guidance during length adjustment.

[0036] The first length adjustment retaining bracket assembly includes a first length adjustment retaining bracket 411 and a bolt. The first length adjustment retaining bracket 411 is connected to the length adjustment bracket 408 through the bolt. The first adjustment nut 403 is placed between the first length adjustment retaining bracket 411 and the length adjustment bracket. The first length adjustment retaining bracket and the length adjustment bracket clamp the first adjustment nut.

[0037] The second length adjustment retaining bracket assembly includes a second length adjustment retaining bracket 412, bolts and a connecting bracket 413. The connecting bracket 413 is fixed on the aluminum cast pipe. The second length adjustment retaining bracket 412 and the connecting bracket 413 are connected by bolts. The second adjustment nut is placed between the second length adjustment retaining bracket and the connecting bracket. The second adjustment nut is clamped between the second length adjustment retaining bracket and the connecting bracket.

[0038] The length adjustment motor is connected to the outer column tube 2 through the length adjustment motor bracket assembly. The length adjustment motor bracket assembly includes a guide sleeve 414, a guide block 415, a length adjustment motor bracket 416, and a bolt 417. The guide sleeve is interference fit onto the guide block. The length adjustment motor bracket is fixed to the guide block, the guide sleeve and the connector 419 of the outer column tube by bolt connection. The guide sleeve and the guide block are placed in the slide groove 418 of the aluminum cast tube and slide in the slide groove of the aluminum cast tube, playing a guiding role during the length adjustment process. At the same time, the open circular groove of the length adjustment motor bracket is installed in coordination with the boss on the length adjustment motor.

[0039] A bushing 6 is provided between the inner column tube assembly 1 and the outer column tube 2. The bushing 6 has irregularly arranged circular holes, and steel balls 61 are pressed into the circular holes. The bushing 6 and the steel balls 61 are combined into a steel ball sliding pair, which is assembled between the inner column tube assembly and the outer column tube.

[0040] The angle adjustment mechanism 5 includes an angle adjustment motor 501, an angle adjustment bracket 502, an angle adjustment retaining bracket 503, a bracket 504, and a sliding plate 505. The angle adjustment motor 501 is mounted on the aluminum casting tube via bolts. The angle adjustment motor 501 can rotate relative to the aluminum casting tube. The output end of the angle adjustment motor 501 is connected to an angle adjustment screw 506, which is fitted with an angle adjustment nut 512. One end of the aluminum casting tube is hingedly connected to the angle adjustment bracket, and the other end is hingedly connected to the bracket 504. The side of the bracket connected to the angle adjustment bracket has a V-shaped groove 514 (with an inwardly concave cross-section and a V-shaped shape). The center of the V-groove is a light hole. The bolt 417 passes through the sliding plate bolt bushing 507, the sliding plate 505, and the light hole in the center of the V-groove of the bracket to connect to the angle adjustment bracket, thereby clamping the bracket 504. The preloaded plastic block 508 is press-fitted onto the angle adjustment bracket, with its other side resting against bracket 35, increasing the steering column's natural frequency and horizontal stiffness. The angle adjustment retaining bracket 503 is bolted to the angle adjustment bracket 502, with the angle adjustment nut clamped between the angle adjustment retaining bracket and the angle adjustment bracket.

[0041] Mounting holes 515 are provided on either side of the end of the bracket 504 where it connects to the aluminum pipe. Rotating bolt bushings are installed in these mounting holes, and rotating bolts are inserted into these bushings to connect the aluminum pipe to the bracket. Rotating bolt bushings 509 are provided in the mounting holes 515 on either side of the angle adjustment bracket 502, and rotating bolts 510 are inserted into these bushings to connect the aluminum pipe to the angle adjustment bracket.

[0042] The side of the aluminum cast tube is fixed with a mounting seat 511, and the mounting seat 511 is provided with a bolt hole. The fixing bolt 513 fixes the angle adjustment motor to the mounting seat. The front end of the fixing bolt has an external thread section, and the portion between the external thread section and the nut is a polished rod section. The external thread section of the fixing bolt is threadedly connected to the mounting seat, and the polished rod section matches the hole on the angle adjustment motor. The angle adjustment motor can move up and down relative to the mounting seat (according to the rotation axis) with the polished rod section as the rotation axis. Figure 4 (center direction) rotation.

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] like Figure 1 、 3 , 5, and 6,

[0045] The length adjustment mechanism comprises an inner column tube assembly 1, an outer column tube 2, an aluminum cast tube 3, a bushing 6, a steel ball 61, a length adjustment motor 401, a first lead screw 402, a first adjustment nut 403, a second lead screw 404, a second adjustment nut 405, a crush slider 406, a rivet 407, a length adjustment bracket 408, a length guide bolt sleeve 409, a first length adjustment retaining bracket 411, a second length adjustment retaining bracket 412, a connecting bracket 413, a guide sleeve 414, a guide block 415, and a length adjustment motor bracket 416. The inner column tube assembly is provided with a crush chute. The crush slider is provided with a boss, which is press-fitted into the crush chute on the inner column tube assembly. The rivets are tightened by passing through the circular holes on the crush slider and the inner column tube assembly. The bushing is provided with irregularly arranged circular holes, steel balls are pressed into the circular holes, the bushing and the steel balls are combined into a steel ball sliding pair, and the steel ball sliding pair is assembled between the inner column tube assembly and the outer column tube.

[0046] The length adjustment bracket is connected to the collapse slider through two bolts, and the length guide bolt sleeve is connected to the length adjustment bracket through bolts.

[0047] The length adjustment motor is connected to drive the first lead screw, the second lead screw, the first adjustment nut, and the second adjustment nut to achieve relative movement between the inner column tube assembly, the outer column tube and the aluminum cast tube, thereby achieving the purpose of rapid extension and retraction.

[0048] The first adjustment nut in the length adjustment motor is assembled into the open circular groove in the length adjustment bracket, and a bolt is inserted through two threaded holes in the first length adjustment retaining bracket and the length adjustment bracket to clamp the first adjustment nut. The second adjustment nut in the length adjustment motor is assembled into the circular groove in the connecting bracket on the aluminum casting tube, and a bolt is inserted through the circular hole in the second length adjustment retaining bracket and tightened through the two threaded holes in the connecting bracket on the aluminum casting tube to clamp the second adjustment nut.

[0049] The guide sleeve is a plastic component that is interference-pressed onto the guide block. The guide block has two threaded holes, and the length adjustment motor bracket has two circular holes and an open circular groove. The length adjustment motor bracket is fixed to the guide block via bolts. The bolts pass through the guide block and the guide sleeve to connect to the outer column tube. The guide sleeve slides within the slide groove on the aluminum cast tube, while the open circular groove on the length adjustment motor bracket mates with the boss on the length adjustment motor. The steering wheel length (X-direction) adjustment mechanism utilizes a three-section tube telescopic mechanism. The aluminum cast tube remains stationary during length adjustment. The length adjustment motor drives the two lead screws to rotate.

[0050] The first adjustment nut is fixed to the length adjustment bracket. The first screw rotates and simultaneously moves the inner column tube along the axis of the column. The second adjustment nut is fixed to the aluminum cast tube. The second adjustment screw rotates and simultaneously moves the length adjustment motor, the inner column tube assembly, and the outer column tube along the axis of the column. The outer column tube slides relative to the aluminum cast tube, and the inner column tube assembly slides relative to the outer column tube, thereby achieving steering wheel length adjustment. Compared with the length adjustment mechanism of traditional technology, the total length of the arrangement for the same adjustment distance is shorter, occupying less space in the entire vehicle. At the same time, the inner column tube expands and contracts, and the outer column tube drives the inner column tube to expand and contract, and the expansion and contraction adjustment speed is faster. The steel ball sliding pair is composed of a steel ball and a plastic retainer. The steel ball slides between the inner column tube and the outer column tube.

[0051] like Figure 2 、 3 , 4, 7, 8 and shown,

[0052] The angle adjustment mechanism comprises an angle adjustment motor 501, an angle adjustment bracket 502, an angle adjustment retaining bracket 503, a bracket 504, a sliding plate 505, an angle adjustment screw 506, a sliding plate bolt bushing 507, a pre-tightening plastic block 508, a rotating bolt bushing 509, a rotating bolt 510, an angle adjustment nut 512, and a fixing bolt 513. The angle adjustment motor drives the angle adjustment screw and the angle adjustment nut to move. The angle adjustment motor is rotatably connected to the mounting seat on the aluminum casting pipe via a fixing bolt. The angle adjustment bracket has two optical holes that cooperate with the rotating bolt bushings, two optical holes that cooperate with the pre-tightening plastic block, two threaded holes that cooperate with the bolts for fixing the sliding plate, four threaded holes that cooperate with the bolts for fixing the angle adjustment motor, and one optical hole that cooperates with the angle adjustment nut.

[0053] A rotating bolt bushing is press-fitted onto the angle adjustment bracket and connected to the aluminum cast tube via the rotating bolt. A pre-tightened plastic block is press-fitted onto the angle adjustment bracket via an interference fit. The angle adjustment nut on the angle adjustment motor is bolted together to secure the angle adjustment bracket to the angle adjustment bracket. One end of bracket 504 is secured to the aluminum cast tube 3 via a rotating bolt 510 and the rotating bolt bushing. The other end of bracket 504 has a V-shaped groove that mates with a sliding plate. A light hole is provided in the center of the V-shaped groove. A sliding plate bolt bushing 507 is press-fitted into sliding plate 505. Bolts pass through sliding plate bolt bushing 507, sliding plate 505, and the light hole in bracket 504, securing it to the angle adjustment bracket 502. Simultaneously, sliding plate 505 engages the V-groove in bracket 504, clamping the bracket.

[0054] The steering wheel angle (Z-axis) adjustment mechanism primarily involves an angle adjustment motor driving the angle adjustment screw. This rotation of the angle adjustment screw drives the angle adjustment nut to move along the angle adjustment screw. This movement of the angle adjustment nut drives the entire adjustment mechanism to achieve steering wheel angle adjustment. Compared to traditional angle adjustment mechanisms, this design is structurally simpler and has fewer parts. Furthermore, the motor and screw are integrated, eliminating the uneven force applied to the flexible shaft caused by the angle of the screw relative to the motor changing with the adjustment angle. This reduces NVH issues that can occur during angle adjustment, such as cyclic noise and variable noise.

[0055] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above and does not deviate from the technical solution of the present invention, and designs a structure and implementation similar to the above embodiment without inventiveness based on the technical essence of the present invention, it shall fall within the scope of protection of the present invention.

Claims

1. A long-stroke electrically adjustable steering column, comprising an inner column tube assembly, an outer column tube, an aluminum cast tube, a length adjustment mechanism, and an angle adjustment mechanism. The outer column tube is sheathed over the inner column tube assembly, the aluminum cast tube is sheathed over the outer column tube, and the length adjustment mechanism and the angle adjustment mechanism are mounted on the side of the aluminum cast tube. The characteristics are: The length adjustment mechanism includes a length adjustment motor, a first lead screw, a first adjusting nut, a second lead screw, a second adjusting nut, a length adjustment bracket assembly, a first length adjustment holding bracket assembly and a second length adjustment holding bracket assembly. The length adjustment motor is connected to the outer column tube, and the output ends of the length adjustment motor are respectively connected to the first lead screw and the second lead screw to drive the first lead screw and the second lead screw to rotate. The first adjusting nut is sleeved on the first lead screw, and the first adjusting nut is clamped between the first length adjustment holding bracket assembly and the length adjustment bracket assembly. The length adjustment bracket assembly is connected to the inner column tube, the second adjusting nut is sleeved on the second lead screw, the second adjusting nut is connected to the second length adjustment holding bracket assembly, and the second length adjustment holding bracket assembly is connected to the aluminum cast tube.

2. The long-stroke electrically adjustable steering column according to claim 1, characterized in that: The length adjustment bracket assembly includes a collapse slider, a rivet, a length adjustment bracket, and a length guide bolt sleeve. A collapse groove is opened on the inner column tube assembly, and the collapse slider is provided with a boss, which is interference-pressed into the collapse groove on the inner column tube assembly. The rivets are tightened through the circular holes on the collapse slider and the inner column tube assembly respectively. The length adjustment bracket is connected to the collapse slider bolt through the long groove opened on the side wall of the aluminum cast tube, and the length guide bolt sleeve is connected to the length adjustment bracket by bolts.

3. The long-travel electrically adjustable steering column according to claim 1, characterized in that: The first length adjustment holding bracket assembly includes a first length adjustment holding bracket and a bolt, the first length adjustment holding bracket is connected to the length adjustment bracket through the bolt, the first adjustment nut is placed between the first length adjustment holding bracket and the length adjustment bracket, and the first length adjustment holding bracket and the length adjustment bracket clamp the first adjustment nut.

4. The long-travel electrically adjustable steering column according to claim 1, characterized in that: The second length adjustment retaining bracket assembly includes a second length adjustment retaining bracket, a bolt and a connecting bracket. The connecting bracket is fixed on the aluminum cast pipe. The second length adjustment retaining bracket and the connecting bracket are connected by bolts. The second adjustment nut is placed between the second length adjustment retaining bracket and the connecting bracket. The second adjustment nut is clamped between the second length adjustment retaining bracket and the connecting bracket.

5. The long-stroke electrically adjustable steering column according to claim 1, characterized in that: The length adjustment motor is connected to the outer column tube through the length adjustment motor bracket assembly. The length adjustment motor bracket assembly includes a guide sleeve, a guide block, a length adjustment motor bracket, and a bolt. The guide sleeve is interference fit onto the guide block. The length adjustment motor bracket is fixed to the guide block, the guide sleeve and the outer column tube through a bolt connection. At the same time, the open circular groove of the length adjustment motor bracket is matched with the boss on the length adjustment motor for installation.

6. The long-adjustment-stroke electrically adjustable steering column according to claim 1, characterized in that: A bushing is provided between the inner column tube assembly and the outer column tube. The bushing has irregularly arranged circular holes, and steel balls are pressed into the circular holes. The bushing and the steel balls are combined into a steel ball sliding pair, which is assembled between the inner column tube assembly and the outer column tube.

7. The long-travel electrically adjustable steering column according to claim 1, characterized in that: The angle adjustment mechanism includes an angle adjustment motor, an angle adjustment bracket, an angle adjustment holding bracket, a bracket, and a sliding plate. The angle adjustment motor is installed on an aluminum cast tube by bolts. The output end of the angle adjustment motor is connected to the angle adjustment screw. The angle adjustment screw is provided with an angle adjustment nut. One end of the aluminum cast tube is hingedly connected to the angle adjustment movable bracket, and the other end is hingedly connected to the bracket. A V-shaped groove is provided on the side of the side where the bracket is connected to the angle adjustment bracket. The bolt passes through the sliding plate bolt bushing, the sliding plate and the light hole in the center of the V-shaped groove of the bracket and is connected to the angle adjustment bracket. The bracket is clamped, and the pre-tightened plastic block is interference-pressed onto the angle adjustment bracket. The other side rests on the bracket. The angle adjustment holding bracket is bolted to the angle adjustment bracket, and the angle adjustment nut is clamped between the angle adjustment holding bracket and the angle adjustment bracket.

8. The long-travel electrically adjustable steering column according to claim 7, characterized in that: The bracket is provided with mounting holes on both sides of one end connected to the aluminum cast pipe, and a rotating bolt bushing is installed in the mounting hole. The rotating bolt is inserted into the rotating bolt bushing to connect the aluminum cast pipe and the bracket; the mounting holes on both sides of the angle adjustment bracket are provided with rotating bolt bushings, and the rotating bolt is inserted into the rotating bolt bushing to connect the aluminum cast pipe and the angle adjustment bracket.

9. The long-travel electrically adjustable steering column according to claim 7, characterized in that: A mounting seat is fixed to the side of the aluminum cast tube, and a bolt hole is opened on the mounting seat. The screw of the fixing bolt is divided into an external thread section at the front end and a polished rod section between the nut and the external thread section. The fixing bolt passes through the hole on the angle adjustment motor, and the external thread section at the front end is threadedly connected to the mounting seat, and the polished rod section cooperates with the hole on the angle adjustment motor.

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