Electrically adjustable steering column and electric power steering system

Abstract

The present application relates to the technical field of vehicle steering, and provides a power-adjustable steering column and an electric power-assisted steering system. The power-adjustable steering column comprises a telescopic component including a first steering shaft and a first protective tube sleeved outside the first steering shaft; a driving component including a driving support arranged on the outer wall of the first protective tube, the body part of the driving support being provided with a first energy-absorbing groove extending in the axial direction; and an energy-absorbing component including a first bolt penetrating through the first energy-absorbing groove and extending into the first protective tube, the first bolt being fixedly connected with the first protective tube and being slidably matched with the first energy-absorbing groove. In the use stage, the first bolt is kept at the first end of the first energy-absorbing groove, and the driving component can drive the telescopic component to extend or retract through the driving support. In the collapse energy-absorbing stage, the telescopic component collapses and at least drives the first bolt to slide in the first energy-absorbing groove. The present application mainly realizes the keeping function in the telescopic adjustment and the energy-absorbing function in the collision collapse through the bolt, simplifies the structure, and reduces the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle steering, in particular to an electrically adjustable steering column and an electric power steering system. BACKGROUND

[0002] The steering column is part of the electric power steering system of a vehicle, used to connect the steering wheel and the intermediate shaft, helping the vehicle to steer. When the vehicle collides, the driver will move forward under the action of inertia, causing the chest and other parts to collide violently with the steering wheel; in order to reduce the harm to the driver, the structure of the steering column needs to consider energy absorption in collapse.

[0003] Figure 1 The structure of the existing steering column is shown, which is an electrically adjustable steering column, including an upper steering shaft 110 connected to the steering wheel and a lower steering shaft 120 connected to the intermediate shaft. The upper steering shaft 110 is provided with an upper protective tube 130, and the lower steering shaft 120 is provided with a lower protective tube 140. The upper steering shaft 110 and the upper protective tube 130 can be telescoped relative to the lower steering shaft 120 and the lower protective tube 140 under the drive of the driving device 150.

[0004] The existing steering column mainly realizes energy absorption through the steel belt 160. Specifically, the driving motor of the driving device 150 is connected with the lower protective tube 140, and the driving shaft of the driving motor is connected with the upper protective tube 130 through the specially designed steel belt 160 and some support structures. In the normal state, the steel belt 160 remains original, and the driving device 150 can drive the upper steering shaft 110 and the upper protective tube 130 to telescope; when a collision occurs, the impact force is transmitted to the upper steering shaft 110 through the steering wheel, and the upper steering shaft 110 and the upper protective tube 130 collapse, while the steel belt 160 deforms to absorb the impact energy. The steel belt 160 also needs to be matched with a retainer to constrain the deformation of the steel belt 160.

[0005] The current design of using steel belt 160 to realize energy absorption will result in a complex overall structure of the steering column, high cost, and is not conducive to actual use.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0007] Therefore, the present application provides an electrically adjustable steering column and an electric power steering system. The electrically adjustable steering column mainly realizes the functions of holding during telescopic adjustment and energy absorption during collision collapse through the cooperation of bolts and driving supports, simplifies the structure of the electrically adjustable steering column, and reduces the cost.

[0008] According to an aspect of the present application, there is provided an electrically adjustable steering column, comprising: a telescopic component, comprising a first steering shaft and a first sheath pipe sleeved outside the first steering shaft; a driving component, comprising a driving bracket arranged on an outer wall of the first sheath pipe, a body portion of the driving bracket being provided with a first energy absorption slot extending along an axial direction; an energy absorption component, comprising a first screw passing through the first energy absorption slot and extending into the first sheath pipe, the first screw being fixedly connected with the first sheath pipe and being slidably matched with the first energy absorption slot; in a use stage, the first screw is kept at a first end of the first energy absorption slot, and the driving component can drive the telescopic component to extend or retract through the driving bracket; in a collapse energy absorption stage, the telescopic component collapses and drives at least the first screw to slide in the first energy absorption slot.

[0009] In some embodiments, an end surface of the first end of the first energy absorption slot is provided with a first clamping protrusion protruding radially outward; in the use stage, a fastening end surface of the first screw presses the first clamping protrusion; in a release stage of the collapse energy absorption stage, the telescopic component drives the fastening end surface of the first screw to be separated from the first clamping protrusion; in an energy absorption stage of the collapse energy absorption stage, the telescopic component drives the first screw to slide in the first energy absorption slot.

[0010] In some embodiments, a friction plate is arranged between the fastening end surface of the first screw and the driving bracket, the friction plate being fixedly connected with the first screw and being slidably matched with the driving bracket; in the use stage, the first screw is pressed at the first end of the first energy absorption slot through the friction plate; in the collapse energy absorption stage, the first screw drives the friction plate to slide relative to the driving bracket.

[0011] In some embodiments, the friction plate is provided with a boss clamped into the first energy absorption slot; an outer surface of the friction plate is coated with an electrophoretic coating; the friction plate is fastened to the driving bracket by two first screws.

[0012] In some embodiments, a maximum sliding stroke of the first screw is equal to a length of the first energy absorption slot along the axial direction; the first screw and the first energy absorption slot are in interference fit.

[0013] In some embodiments, a tail end of the driving bracket is provided with a second energy absorption slot extending along the axial direction; the energy absorption component further comprises a second screw passing through the second energy absorption slot and extending into the first sheath pipe, the second screw being fixedly connected with the first sheath pipe and being slidably matched with the second energy absorption slot; in the use stage, the second screw is kept at a first end of the second energy absorption slot; in the collapse energy absorption stage, the telescopic component further drives the second screw to slide out of the second energy absorption slot.

[0014] In some embodiments, the end face of the first end of the second energy absorption groove is provided with a radially outward protruding second clamping protrusion; in the use stage, the fastening end face of the second bolt presses the second clamping protrusion; in the release stage of the collapse energy absorption stage, the telescopic component drives the fastening end face of the second bolt to be separated from the second clamping protrusion; in the energy absorption stage of the collapse energy absorption stage, the telescopic component drives the second bolt to slide out of the second energy absorption groove.

[0015] In some embodiments, the electrically adjustable steering column further comprises a hollow rivet connected between the driving support and the first protective tube; in the release stage of the collapse energy absorption stage, the telescopic component drives the hollow rivet to break.

[0016] In some embodiments, the electrically adjustable steering column further comprises a second steering shaft, the tail end of the first steering shaft being coaxially sleeved with the head end of the second steering shaft; a second protective tube is arranged outside the second steering shaft; the driving motor of the driving component is connected with the second protective tube, and the driving motor is connected with the driving support through a driving shaft.

[0017] According to an aspect of the present application, there is provided an electric power assisted steering system comprising the electrically adjustable steering column as described in any of the above embodiments.

[0018] The present application has at least the following beneficial effects compared with the prior art:

[0019] The electrically adjustable steering column of the present application mainly uses a bolt as the energy absorption component. Through the cooperation between the bolt and the energy absorption groove of the driving support, the bolt can play a fixing and retaining role in the use stage to keep the stability of the steering column, and can also drive the telescopic component to be telescoped by the driving support, and can play an energy absorption role in the collapse energy absorption stage to absorb the collision energy with the telescopic component, thereby ensuring the safety. In addition, the overall structure of the electrically adjustable steering column is simple, and the cost is reduced.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0022] Figure 1A structural schematic diagram of a steering column in the prior art is shown;

[0023] Figure 2 A structural schematic diagram of an electrically adjustable steering column in an embodiment of the present application is shown;

[0024] Figure 3 A structural schematic diagram of an electrically adjustable steering column in an embodiment of the present application is shown; Figure 2 A structural schematic diagram of an energy-absorbing component of the electrically adjustable steering column shown in use is shown;

[0025] Figure 4 A structural schematic diagram of an energy-absorbing component of the electrically adjustable steering column shown in use is shown; Figure 2 A structural schematic diagram of an energy-absorbing component of the electrically adjustable steering column shown in collapse energy-absorbing stage is shown;

[0026] Figure 5 A structural schematic diagram of an electrically adjustable steering column in an embodiment of the present application is shown; Figure 4 A sectional schematic diagram of the A-A' section line is shown;

[0027] Figure 6 A structural schematic diagram of an electrically adjustable steering column in an embodiment of the present application is shown;

[0028] Figure 7 A structural schematic diagram of an electrically adjustable steering column in an embodiment of the present application is shown; Figure 6 A structural schematic diagram of an energy-absorbing component of the electrically adjustable steering column shown in use is shown;

[0029] Figure 8 A structural schematic diagram of an energy-absorbing component of the electrically adjustable steering column shown in use is shown; Figure 6 A structural schematic diagram of an energy-absorbing component of the electrically adjustable steering column shown in collapse energy-absorbing stage is shown. DETAILED DESCRIPTION

[0030] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any number of ways, and are not limited to the implementations set forth in this document. Rather, implementations provide a full and enabling disclosure, and will clearly enable one of ordinary skill in the art to

[0031] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0032] Figure 2 A structural schematic diagram of an electrically adjustable steering column in an embodiment of the present application is shown, Figure 3 A structural schematic diagram of an energy-absorbing component of the electrically adjustable steering column shown in use is shown,Figure 4 show the structure of the energy-absorbing component of the electrically adjustable steering column in the collapse energy-absorbing stage, Figure 5 show Figure 4 the cross-sectional structure of the middle A-A' section line, in combination with Figures 2 to 5 As shown, the electrically adjustable steering column in the embodiment comprises:

[0033] The telescopic component 21 comprises a first steering shaft 211 and a first protective tube 212 sleeved outside the first steering shaft 211. The first steering shaft 211 is used to be connected with the steering wheel. The first protective tube 212 and the first steering shaft 211 are connected through bearings.

[0034] The driving component 30 comprises a driving bracket 31 arranged on the outer wall of the first protective tube 212. The body part of the driving bracket 31 is provided with a first energy-absorbing groove 32 extending in the axial direction. The axial direction refers to the axial direction of the first steering shaft 211, i.e. the axial direction of the electrically adjustable steering column.

[0035] In addition, the electrically adjustable steering column further comprises a second steering shaft 221, the tail end of the first steering shaft 211 is coaxially sleeved with the head end of the second steering shaft 221; and a second protective tube 222 arranged outside the second steering shaft 221. Among them, the head end refers to the end close to the steering wheel, and the tail end refers to the end away from the steering wheel. The second protective tube 222 can be fixedly connected with the vehicle support. The driving motor of the driving component 30 is connected with the second protective tube 222, and the driving motor is connected with the driving bracket 31 through the driving shaft 36.

[0036] The energy-absorbing component 40 comprises a first bolt 41 extending into the first protective tube 212 through the first energy-absorbing groove 32. The first bolt 41 is fixedly connected with the first protective tube 212 and is slidably matched with the first energy-absorbing groove 32. The first bolt 41 and the first protective tube 212 can be fixedly connected through screwing.

[0037] In the use stage, the first bolt 41 is kept at the head end of the first energy-absorbing groove 32, and the driving component 30 can drive the telescopic component 21 to extend and retract through the driving bracket 31. In the normal use stage, the energy-absorbing component 40 plays a fixed retaining role and can bear a predetermined range of load to ensure the stability of the steering column. At this time, the driving component 30 can also drive the telescopic component 21 to extend and retract through the fixed retaining driving bracket 31 to realize the adjustment of the position of the steering wheel.

[0038] In the collapse energy-absorbing stage, the telescopic component 21 collapses and at least drives the first bolt 41 to slide in the first energy-absorbing groove 32. In the collapse energy-absorbing stage, the telescopic component 21 collapses due to the violent impact from the steering wheel, and the impact force is greater than the retaining force of the energy-absorbing component 40. The first bolt 41 slides in the first energy-absorbing groove 32 under the driving of the first protective tube 212 to absorb the collision energy.

[0039] The maximum sliding stroke of the first bolt 41 is equal to the length of the first energy absorption groove 32 in the axial direction, so as to play a deformation restraining role in the collapse of the steering column. The length of the first energy absorption groove 32 can be designed as required, and different lengths can be adapted for different vehicle models to ensure that both the deformation restraining role and the absorption of most of the collision energy through sufficient sliding friction stroke can be played.

[0040] In addition, the first bolt 41 and the first energy absorption groove 32 can be in interference fit, and the specific interference amount can be set as required to ensure that sufficient sliding friction can be generated when the first bolt 41 slides in the first energy absorption groove 32 to absorb collision energy.

[0041] In one embodiment, the end face of the first end of the first energy absorption groove 32 is provided with a radially outward protruding first clamping protrusion 320; in the use stage, the fastening end face of the first bolt 41 presses the first clamping protrusion 320; in the release stage of the collapse energy absorption stage, the telescopic component 21 drives the fastening end face of the first bolt 41 to disengage from the first clamping protrusion 320, and in the energy absorption stage of the collapse energy absorption stage, the telescopic component 21 drives the first bolt 41 to slide in the first energy absorption groove 32. That is, the collapse energy absorption stage includes a release stage and an energy absorption stage. The release stage is achieved at least by friction between the first bolt 41 and the first clamping protrusion 320, and the energy absorption stage is mainly achieved by interference fit between the first bolt 41 and the first energy absorption groove 32.

[0042] In the normal use stage, the torque of the first bolt 41 matches the protruding degree of the first clamping protrusion 320, which can ensure that the first bolt 41 remains fixed with the driving bracket 31, the steering column as a whole remains stable, and the driving component 30 can drive the telescopic component 21 to extend or retract through the fixed driving bracket 31; in the collapse energy absorption stage, the impact force is greater than the disengagement force between the first bolt 41 and the first clamping protrusion 320, so that the first bolt 41 is driven by the first guard tube 212 to disengage from the first clamping protrusion 320 and slide in the first energy absorption groove 32 to absorb collision energy.

[0043] Figure 6 show a partial structure of an electrically adjustable steering column in yet another embodiment, Figure 7 show Figure 6 show the structure of an energy absorption component of an electrically adjustable steering column in a use stage, Figure 8 show Figure 6 show the structure of an energy absorption component of an electrically adjustable steering column in a collapse energy absorption stage. Figures 6 to 8 show an electrically adjustable steering column, and Figures 2 to 5 The electrically adjustable steering column shown differs in that:

[0044] The first clamping protrusion 320 is not arranged on the end face of the first energy absorption groove 32, but the compression between the first bolt 41 and the driving bracket 31 is realized through the friction plate 46. Specifically, the friction plate 46 is arranged between the fastening end face of the first bolt 41 and the driving bracket 31, the friction plate 46 is fixedly connected with the first bolt 41 and slidably matched with the driving bracket 31; in the use stage, the first bolt 41 is compressed to the first end of the first energy absorption groove 32 through the friction plate 46; in the collapse energy absorption stage, the first bolt 41 drives the friction plate 46 to slide relative to the driving bracket 31.

[0045] Through the cooperation of the friction plate 46 between the first bolt 41 and the driving bracket 31, the same effect can be achieved that the first bolt 41 and the driving bracket 31 are fixed in the normal use stage, the steering column as a whole is stable, and the driving part 30 can drive the telescopic part 21 to stretch and retract through the driving bracket 31 which is fixedly retained; in the collapse energy absorption stage, the impact force is greater than the retaining force provided by the friction plate 46, so that the first bolt 41 slides in the first energy absorption groove 32 under the driving of the first protective tube 212, and at the same time the first bolt 41 drives the friction plate 46 to slide relative to the driving bracket 31, thereby absorbing the collision energy.

[0046] In one embodiment, the friction plate 46 is provided with a boss 460 clamped into the first energy absorption groove 32. The boss 460 can prevent the friction plate 46 from rotating around the first bolt 41, and ensure that the contact area between the friction plate 46 and the driving bracket 31 does not change greatly during the collision process, thereby ensuring the stability of the energy absorption capacity.

[0047] In one embodiment, the outer surface of the friction plate 46 is coated with an electrophoretic coating layer, so as to control the roughness of the friction plate 46 within a reasonable range and reduce the friction coefficient of the friction plate 46, so as to avoid affecting the torque of the first bolt 41. The electrophoretic coating layer can be selected according to the needs of the appropriate electrophoretic paint material.

[0048] In one embodiment, the friction plate 46 can be tightened to the driving bracket 31 by two first bolts 41, so as to ensure the stable connection of the friction plate 46.

[0049] Further, as shown in Figure 3 , Figure 4 , Figure 7 and Figure 8 , in some embodiments, the tail end of the driving bracket 31 is further provided with a second energy absorption groove 33 extending in the axial direction; the energy absorption part 40 further comprises: a second bolt 42 penetrating into the first protective tube 212 through the second energy absorption groove 33, the second bolt 42 being fixedly connected with the first protective tube 212 and slidably matched with the second energy absorption groove 33; in the use stage, the second bolt 42 is retained at the first end of the second energy absorption groove 33; in the collapse energy absorption stage, the telescopic part 21 also drives the second bolt 42 to slide out of the second energy absorption groove 33.

[0050] The second energy absorption groove 33 is relatively short and mainly cooperates with the second bolt 42 to achieve fixing and retaining. Of course, it can also enhance the energy absorption effect. Specifically, in the normal use stage, the first bolt 41 is retained at the head end of the first energy absorption groove 31, and is far away from the telescopic adjustment fulcrum. If only the fixing and retaining force provided by the first bolt 41 is relied on in the telescopic adjustment process, it may cause unstable telescopic adjustment, cause the first protective pipe 212 to be tilted relative to the second protective pipe 222, and cause the torque of the first bolt 41 to be loose. Therefore, in the embodiment, the cooperation of the second bolt 42 and the second energy absorption groove 33 at the tail end of the driving bracket 31 can improve the smoothness and stability during telescopic adjustment, so that the head end and the tail end of the driving bracket 31 can achieve fixing and retaining in the normal use stage, and the energy absorption effect of the energy absorption component 40 can be enhanced.

[0051] In one embodiment, the end face of the head end of the second energy absorption groove 33 is provided with a radially outward protruding second clamping protrusion 330; in the use stage, the fastening end face of the second bolt 42 presses the second clamping protrusion 330; in the release stage of the collapse energy absorption stage, the telescopic component 21 drives the fastening end face of the second bolt 42 to be separated from the second clamping protrusion 330, and in the energy absorption stage of the collapse energy absorption stage, the telescopic component 21 drives the second bolt 42 to slide out of the second energy absorption groove 33. The principle of the second clamping protrusion 330 is the same as that of the first clamping protrusion 320, which can ensure that the second bolt 42 and the driving bracket 31 are fixed in the normal use stage, and the whole steering column is stable, so that the driving component 30 drives the telescopic component 21 to telescope through the fixed driving bracket 31. In the collapse energy absorption stage, the impact force is greater than the separation force between the second bolt 42 and the second clamping protrusion 330, so that the second bolt 42 is driven by the first protective pipe 212 to separate from the second clamping protrusion 330 and further slide out of the second energy absorption groove 33; a part of the collision energy is absorbed in the sliding friction process between the second bolt 42 and the second energy absorption groove 33.

[0052] Therefore, in the embodiment, the release stage can be realized by the friction between the first bolt 41 and the first clamping protrusion 320 and the friction between the second bolt 42 and the second clamping protrusion 330, and the energy absorption stage is mainly realized by the interference fit between the first bolt 41 and the first energy absorption groove 32, and is assisted by a small interference fit between the second bolt 42 and the second energy absorption groove 33.

[0053] In addition, in combination with Figure 3 , Figure 4 , Figure 7 and Figure 8As shown, the electrically adjustable steering column further comprises a hollow rivet 50 connected between the driving bracket 31 and the first protective tube 212; in the releasing stage of the collapsing energy absorption stage, the telescopic component 21 drives the hollow rivet 50 to break. The hollow rivet 50 can be arranged at a suitable position between the driving bracket 31 and the first protective tube 212 as required, and the number of the hollow rivets 50 can also be adjusted as required, and is not limited to the number shown in the figure. In the normal use stage, the hollow rivet 50 plays a certain fixing and retaining role; in the collapsing energy absorption stage, the hollow rivet 50 breaks, so that the first protective tube 212 and the driving bracket 31 can move relatively.

[0054] Therefore, in the embodiment, the releasing stage is realized by shearing the hollow rivet 50, the friction between the first bolt 41 and the first clamping protrusion 320, and the friction between the second bolt 42 and the second clamping protrusion 330, and the energy absorption stage is mainly realized by the interference fit between the first bolt 41 and the first energy absorption groove 32, supplemented by a small interference fit between the second bolt 42 and the second energy absorption groove 33.

[0055] In summary, the electrically adjustable steering column of the present application mainly designs the energy absorption component through a bolt, and through the cooperation between the bolt and the energy absorption groove of the driving bracket, the energy absorption component can play a fixing and retaining role in the use stage, ensure the stability of the steering column, and drive the telescopic component to be telescopic through the driving bracket driven by the driving component, so as to realize the adjustment of the position of the steering wheel; in the collapsing energy absorption stage, the energy absorption component plays an energy absorption role, slides in the energy absorption groove with the collapsing of the telescopic component to absorb the collision energy, and ensures the safety; through experimental tests, the energy absorption component of the present application can realize good fixing and retaining role and energy absorption role, and the overall structure of the electrically adjustable steering column is simple and the cost is reduced.

[0056] The embodiment of the present application also provides an electric power assisted steering system, which comprises the electrically adjustable steering column described in any of the above embodiments. The electric power assisted steering system can realize the stability of the overall structure in the normal use stage, and can adjust the position of the steering wheel as required; in the collapsing energy absorption stage, the electric power assisted steering system can realize the absorption of the collision energy with the collapsing of the steering column, and ensures the safety; and the overall structure of the electric power assisted steering system is simple and the cost is reduced.

[0057] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. An electrically adjustable steering column, characterized in that, include: The telescopic component includes a first steering shaft and a first protective tube sleeved outside the first steering shaft; The driving component includes a driving bracket disposed on the outer wall of the first protective tube. The main body of the driving bracket is provided with a first energy-absorbing groove extending along the axial direction, and the tail end of the driving bracket is provided with a second energy-absorbing groove extending along the axial direction. The energy-absorbing component includes a first bolt that passes through the first energy-absorbing groove and extends into the first protective tube, and a second bolt that passes through the second energy-absorbing groove and extends into the first protective tube. The first bolt is fixedly connected to the first protective tube and slidably engaged with the first energy-absorbing groove, and the second bolt is fixedly connected to the first protective tube and slidably engaged with the second energy-absorbing groove. A friction plate is disposed between the fastening end face of the first bolt and the drive bracket. The friction plate is fixedly connected to the first bolt and slidably engaged with the drive bracket. The friction plate has a boss that engages with the first energy-absorbing groove. The outer surface of the friction plate is coated with an electrophoretic coating. During use, the first bolt is pressed and held at the beginning of the first energy-absorbing groove by the friction plate, the second bolt is held at the beginning of the second energy-absorbing groove, and the driving component can drive the telescopic component to extend and retract through the driving bracket; During the collapse and energy absorption phase, the retractable component collapses, causing at least the first bolt to slide in the first energy absorption groove, and the first bolt causes the friction plate to slide relative to the drive bracket. The retractable component also causes the second bolt to slip out of the second energy absorption groove.

2. The electrically adjustable steering column as described in claim 1, characterized in that, The first end face of the first energy-absorbing groove is provided with a first engaging protrusion that protrudes radially outward; During the usage phase, the fastening end face of the first bolt presses against the first engaging protrusion; During the release phase of the collapse energy absorption phase, the retractable component causes the fastening end face of the first bolt to disengage from the first engaging protrusion. During the energy absorption phase of the collapse energy absorption phase, the retractable component causes the first bolt to slide in the first energy absorption groove.

3. The electrically adjustable steering column as described in claim 1, characterized in that, The maximum sliding stroke of the first bolt is equal to the length of the first energy-absorbing groove along the axial direction; The first bolt and the first energy-absorbing groove are interference-fitted.

4. The electrically adjustable steering column as described in claim 1, characterized in that, The end face of the first end of the second energy-absorbing groove is provided with a second engaging protrusion that protrudes radially outward; During the usage phase, the fastening end face of the second bolt presses against the second engaging protrusion; During the release phase of the collapse and energy absorption phase, the retractable component causes the fastening end face of the second bolt to disengage from the second engaging protrusion. During the energy absorption phase of the collapse and energy absorption phase, the retractable component causes the second bolt to slide out of the second energy absorption groove.

5. The electrically adjustable steering column as described in claim 1, characterized in that, Also includes: Hollow rivets are used to connect the drive bracket and the first protective tube. During the release phase of the collapse and energy absorption phase, the retractable component causes the hollow rivet to break.

6. The electrically adjustable steering column as described in claim 1, characterized in that, Also includes: The second steering shaft, wherein the tail end of the first steering shaft is slidably coaxially sleeved with the head end of the second steering shaft; The second protective tube is installed outside the second steering shaft; The drive motor of the drive component is connected to the second protective tube, and the drive motor is connected to the drive bracket via a drive shaft.

7. An electric power steering system, characterized in that, Includes the electrically adjustable steering column as described in any one of claims 1-6.

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