CN112298335B - Collapse energy-absorbing and anti-falling structure of steering column - Google Patents
Collapse energy-absorbing and anti-falling structure of steering column Download PDFInfo
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- CN112298335B CN112298335B CN202011088940.2A CN202011088940A CN112298335B CN 112298335 B CN112298335 B CN 112298335B CN 202011088940 A CN202011088940 A CN 202011088940A CN 112298335 B CN112298335 B CN 112298335B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- 230000007246 mechanism Effects 0.000 claims description 17
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 230000006378 damage Effects 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 5
- 238000001746 injection moulding Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
- B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
- B62D1/19—Steering columns yieldable or adjustable, e.g. tiltable incorporating energy-absorbing arrangements, e.g. by being yieldable or collapsible
- B62D1/195—Yieldable supports for the steering column
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Abstract
The invention provides a collapse energy-absorbing and anti-falling structure of a steering column, which comprises an installation support and a clamping block, wherein the installation support is fixed on a vehicle body and covers an upper column tube; two sides of the clamping block are provided with symmetrical sliding grooves along the axial direction of the upper column tube, the mounting bracket is provided with a handle shaft transversely penetrating through the sliding grooves, the front end of each sliding groove is provided with an extension groove, and a breakable steel belt is arranged in each extension groove; one end of the steel belt facing the sliding chute is a wedge-shaped end; a wedge-shaped block matched with the wedge-shaped end is convexly arranged on the handle shaft. The invention can well control the collapse peak force and the continuous force of the steering column through the breakable steel belt, realize stable energy absorption and reduce the damage to a driver when collision occurs; and a handle shaft of the mounting bracket fixed on the vehicle body transversely penetrates through the sliding groove of the clamping block, and can enable the steel strip to collapse and deform along the extension groove after collision occurs, so that the steering column can be effectively prevented from falling, and the steering column still has steering capacity after collapsing is ensured.
Description
Technical Field
The invention relates to the technical field of automobile collision safety, in particular to a crumple energy-absorbing and anti-falling structure arranged on a steering column and used for reducing the secondary damage value of a steering wheel to a human body after a vehicle collides.
Background
With the rapid development of automobile technology, safety regulations have higher and higher requirements on automobile safety, and the four-way adjustable collapsible steering column is popularized on passenger vehicles. The traditional collapse energy-absorbing steering column adopts an interference fit of riveting points of an upper column tube and a lower column tube, an injection molding structure of a pull-out block of a mounting bracket or a structure of the pull-out block matched with an energy-absorbing steel belt. The structure has high requirement on the matching precision of the upper column tube and the lower column tube, and the riveting process is difficult to meet the requirement, so that the collapsing force of the upper column tube and the lower column tube is difficult to control. The steering column pull-off block and the mounting bracket are subjected to injection molding, the pull-off force of an injection molding structure has more influence factors, such as injection molding amount, injection molding temperature, injection molding hole size and the like, the pull-off force is not easy to control, and the tolerance range is large.
Therefore, the collapse peak force and the holding force of the tubular column with the traditional structure are not easy to control. The steering column with the traditional structure has no anti-drop structure after collapsing, and the steering column falls down in the collapsing process, so that the column cannot stably absorb energy. Some structures adopting energy-absorbing steel belts can prevent the pipe column from falling to a certain extent. In order to reduce the damage to human bodies, the steering column is required to have stable energy absorption force, and the traditional crumpling structure is difficult to meet the requirement.
Disclosure of Invention
The invention aims to provide a collapse energy-absorbing and anti-falling structure of a steering column, the steering column can stably absorb energy, effectively avoid the problem that the steering column falls off after a vehicle collides, reduce the secondary damage of the steering column to a driver, and has the advantages of simple structure and low cost.
The invention relates to a collapse energy-absorbing and anti-falling structure of a steering column, which comprises an installation support and a clamping block, wherein the installation support is fixed on a vehicle body and covers an upper column tube; the key point is that the front end of the sliding groove is provided with an extension groove, and a breakable steel belt is arranged in the extension groove; one end of the steel belt facing the sliding chute is a wedge-shaped end; and a wedge-shaped block matched with the wedge-shaped end is convexly arranged on the handle shaft.
When collision happens, the reaction force generated by the explosion of the safety airbag is sequentially transmitted to the structure on the steering column through the steering wheel, the steel belt is impacted by the handle shaft, the wedge-shaped block is matched with the wedge-shaped end to break the connecting part at the rear end of the steel belt, and the steel belt is gradually bent and deformed towards the inner side (or the outer side) under the action of the handle shaft to achieve the effect of gradual collapse and energy absorption; the installing support is installed in the periphery of last column jacket with pressing from both sides tight piece cooperation to restrain the upper column jacket under the stress condition, can effectively prevent falling of steering column.
The wedge block is a pair of symmetrically arranged triangular bodies on the handle shaft, and the triangular bodies are opposite to the wedge end on the mounting structure.
Furthermore, one end of the steel strip is connected with two side walls of the connecting part of the sliding groove and the extending groove in a breaking mode, the other end of the steel strip is connected with the front end wall of the extending groove in an integrated mode, and one end of the steel strip tends to be gradually reduced in width towards the other end of the steel strip. The steel band is connected in the extending groove through its both ends, and the front end is connected with the extending groove integral type, and the rear end is connected with the extending groove in spout and extending groove looks portion and is the formula of can breaking, and the steel band is whole to be a trapezoidal, and the width diminishes to the front end by the rear end gradually, makes to form triangular space between its both sides and the lateral wall of extending groove, and the steel band of being convenient for is in the collapse deformation of extending groove behind the atress fracture. The extending groove is communicated with the sliding groove, and the front end of the extending groove is one end close to a steering wheel of the automobile.
Further, the distance between the two side walls of the clamping block is equal to or larger than the sum of the lengths of the steel strips in the extension grooves on the two sides. The length design of the steel belts is limited by the distance between the two side walls of the clamping block so as to prevent the two steel belts from contacting with each other in the inward bending deformation process and reduce the collapse peak force and the continuous force of the steering column.
Further, the thickness of the steel strip is equal to or less than the thickness of the extension groove. The thickness of the steel strip can be equal to the thickness of the side wall of the extension groove, so that the steel strip is convenient to integrally form during production; and the thickness of the extension groove can be smaller than that of the extension groove, so that the integral collapse force can be improved.
In addition, the width of the extension groove can be designed to be smaller than that of the sliding groove, and the extension groove can be designed to have a trend that the width is gradually reduced from one end, connected with the sliding groove, to the other end.
Furthermore, the mounting bracket comprises a fixed frame with a flying wing structure and a retainer with a U-shaped structure, the top of the retainer is fixed on the lower end surface of the middle part of the fixed frame, and two side walls of the retainer are provided with symmetrical guide holes; the clamping block is also of a U-shaped structure, the openings of the retainer and the clamping block are opposite and partially overlap to surround the upper column tube, and the guide hole corresponds to the sliding groove. Mounting holes for fixing the mounting bracket on the vehicle body are arranged on two side wings of the fixing frame, and the retainer is welded below the middle part of the fixing frame; when the handle shaft is installed, the handle shaft sequentially penetrates through the guide hole and the sliding groove on one side of the upper column tube and the sliding groove and the guide hole on the other side of the upper column tube, and the upper column tube is supported at the bottom.
Furthermore, a guide block capable of sliding up and down along the guide hole is arranged on the outer side of the wedge-shaped block. During installation, the guide block is matched in the guide hole, the guide block can be set to be rectangular, the guide hole is set to be another rectangular with the width matched with the guide block and the length larger than the guide block, and the guide block can slide up and down in the guide hole to realize height adjustment of the steering wheel.
Further, the handle shaft transversely penetrates through the guide hole and the sliding groove through a handle locking mechanism. When the handle locking mechanism is in a locking state, the retainer deforms towards the clamping block, and the friction force between the retainer and the clamping block can achieve the effect of energy absorption.
Furthermore, the handle locking mechanism comprises a cam group and a handle arm, the cam group is sleeved on any outer side of the retainer on the handle shaft, a protruding rectangular block is arranged at the outer end of the cam group, and a rectangular hole matched with the rectangular block is formed in the upper end part of the handle arm; the cam set includes a first cam and a second cam that are relatively rotatable along a handle axis. The cam group is matched with the handle shaft through threads, and the axial distance of the cam group (namely between the first cam and the second cam) can be increased or decreased through the rotation of the cam group along the handle shaft, so that the retainer deforms towards the direction of the clamping block; the rectangular hole of the handle arm is in interference fit with the rectangular hole of the cam group, so that the handle locking mechanism can be conveniently adjusted through the handle arm.
Specifically, the handle arm may be provided in a Z-shaped configuration, or other configuration that is advantageous in avoiding interference with the vehicle body.
Further, the inner sides of the first cam and the second cam, which are opposite to each other, are provided with lugs which are evenly arranged at intervals along the edge, and the lugs of the first cam and the lugs of the second cam are staggered with each other. The convex blocks of the first cam and the second cam are contacted in the adjusting process, so that the over-adjustment can be avoided.
The inner sides of the first cam and the second cam are provided with convex rings, and the convex blocks of the first cam and the second cam rotate around the convex rings of the other cam relatively, so that the overall structure of the cam group is more stable, and the rotating track is controllable.
Furthermore, the outer end of the handle arm is provided with a fixing bolt, and the other end of the handle shaft, which is far away from the handle locking mechanism, is provided with a baffle plate. A plane bearing can be arranged between the handle arm and the fixing bolt, so that a gasket can be saved, the design is more compact, the edge stress can be reduced, and the service life is prolonged.
According to the steering column, the extending groove is formed in the front end of the sliding groove, and the breakable steel belt is arranged in the extending groove, so that the collapse peak force and the continuous force of the steering column can be well controlled, stable energy absorption is realized, and the injury to a driver when collision occurs is reduced; and a handle shaft of the mounting bracket fixed on the vehicle body transversely penetrates through the sliding groove of the clamping block, and can enable the steel strip to collapse and deform along the extension groove after collision occurs, so that the steering column can be effectively prevented from falling, and the steering column still has steering capacity after collapse.
Drawings
Fig. 1 is a schematic view of the overall structure of a steering column of the present invention.
Fig. 2 is a schematic view of the upper column tube structure of the present invention.
Fig. 3 is a schematic view of the mounting bracket structure of the present invention.
Fig. 4 is a schematic view of the structure of the clamping block of the invention.
Fig. 5 is a schematic view of the handle shaft structure of the present invention.
FIG. 6 is a schematic view showing the connection between the clamping block and the handle shaft according to the present invention.
Fig. 7 is a cam set configuration of the handle locking mechanism of the present invention.
FIG. 8 is a graph comparing the curves of the collapse forces of the steering column of the present invention and the conventional structure.
The figures are numbered:
1. a steering column; 2. an upper column tube; 3. mounting a bracket; 31. a fixed mount; 32. a holder; 321. a guide hole; 4. a lower column tube; 5. a clamping block; 51. a chute; 52. an extension groove; 53. a steel belt; 54. a wedge-shaped end; 6. a handle locking mechanism; 61. a bump; 62. a handle arm; 63. a first cam; 64. a second cam; 65. a rectangular block; 7. a handle shaft; 71. a wedge block; 72. a guide block; 73. and a baffle plate.
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, 2, 3, 4, 5, and 6, the steering column 1 includes an upper column tube 2, a mounting bracket 3, a lower column tube 4, and a clamping block 5, the upper column tube and the lower column tube are in transition fit, the sliding force is controlled within 100N, and the impact on collapse is negligible. The mounting bracket 3 is fixedly connected to an instrument beam assembly of the vehicle body through a bolt and can be regarded as being fixed with the vehicle body; meanwhile, the mounting bracket 3 covers the upper column tube 2; the clamping block 5 is welded at the lower end of the upper column tube 2 and is opposite to the mounting bracket 3 in position, symmetrical sliding grooves 51 are formed in two sides of the clamping block 5 along the axial direction of the upper column tube 2, an extending groove 52 is formed in the front end of the sliding groove 51, and a breakable steel belt 53 is arranged in the extending groove 52; one end of the steel belt 53 facing the sliding chute 51 is a wedge-shaped end 54; the handle shaft 7 is convexly provided with a wedge block 71 matched with the wedge end 54, and the wedge block 71 is a pair of symmetrically arranged triangular bodies on the handle shaft 7 and is opposite to the wedge end 54 on the mounting structure.
Specifically, as shown in fig. 3, the mounting bracket 3 includes a fixed frame 31 of a flying wing structure and a holder 32 of a U-shaped structure, the top of the holder 32 is welded to the lower end surface of the middle of the fixed frame 31, and two side walls of the holder 32 are provided with symmetrical guide holes 321; the clamping block 5 is also of a U-shaped structure, the opening of the retainer 32 and the clamping block 5 are opposite and partially overlapped to surround the upper column tube 2, and the guide hole 321 corresponds to the sliding groove 51.
The guiding hole 321 of the holder 32 transversely penetrates a handle shaft 7, and the handle shaft 7 also penetrates the sliding groove 51 corresponding to the guiding hole 321. When the handle shaft 7 is installed, the handle shaft passes through the guide hole 321 and the sliding groove 51 on one side of the upper column tube 2, the sliding groove 51 on the other side of the upper column tube 2 and the guide hole 321 in sequence, and supports the upper column tube 2 at the bottom.
As shown in fig. 4 and 6, the steel strip 53 is connected to the extension groove 52 through two ends thereof, the front end is integrally connected to the extension groove 52, the rear end is breakable at the connection portion between the sliding groove 51 and the extension groove 52, and the steel strip 53 is integrally trapezoidal, and the width of the steel strip 53 is gradually reduced from the rear end to the front end, so that a triangular gap is formed between two sides thereof and the side wall of the extension groove 52, thereby facilitating the collapsing deformation of the steel strip 53 in the extension groove 52 after being broken by force. The extending groove 52 and the slide groove 51 are communicated with each other, and the front end thereof is an end close to the steering wheel of the automobile.
The length of the steel strip 53 is limited by the distance between the two sliding grooves 51 of the clamping block 5 (i.e. between the two side walls of the clamping block 5), and the distance between the two sliding grooves 51 of the clamping block 5 is greater than the sum of the lengths of the steel strips 53 in the extending grooves 52 on the two sides, so that the two steel strips 53 are prevented from contacting each other in the bending deformation process, and the collapse peak force and the continuous force of the steering column 1 are reduced.
The thickness of the steel strip 53 is equal to the thickness of the extension groove 52, which facilitates integral punch forming during production. The thickness of the steel strip 53 can be smaller than that of the extension groove 52 in the specific design, so that the overall collapse force can be improved.
The width of the extension groove 52 may be designed to be smaller than the width of the slide groove 51, and the extension groove 52 may be designed to have a tendency of gradually decreasing in width from one end thereof contacting the slide groove 51 to the other end thereof.
As shown in fig. 5, the handle shaft 7 is provided with a guide block 72 outside the wedge block 71 and slidable up and down along the guide hole 321. When the steering wheel is installed, the guide block 72 is fitted into the guide hole 321 of the holder 32, the guide block 72 is rectangular, the guide hole 321 is another rectangle having a width matching the guide block 72 and a length greater than that of the guide block 72, and the guide block 72 slides up and down in the guide hole 321 to adjust the height of the steering wheel.
As shown in fig. 3, the outer end of the handle shaft 7 (located outside the holder 32) is provided with a handle locking mechanism 6. During ordinary driving, the handle locking mechanism 6 is in a locking state, the retainer 32 deforms towards the clamping block 5, and the friction force between the retainer and the clamping block can achieve the effect of energy absorption.
Specifically, as shown in fig. 3 and 7, the handle locking mechanism 6 includes a cam group and a handle arm 62, the cam group is sleeved on an outer side of the holder 32 on the handle shaft 7, a protruding rectangular block 65 is arranged in the middle of one outward end of the cam group, and a rectangular hole matched with the rectangular block 65 is arranged at the upper end of the handle arm 62; the cam set comprises a first cam 63 and a second cam 64 which are relatively rotatable along the handle shaft 7. The cam group is matched with the handle shaft 7 through threads, and the axial distance of the cam group (namely between the first cam 63 and the second cam 64) can be increased or decreased through the rotation of the cam group along the handle shaft 7, so that the retainer 32 deforms towards the clamping block 5; the rectangular hole of the handle arm 62 is in interference fit with the rectangular hole of the cam group, so that the handle locking mechanism 6 can be conveniently adjusted through the handle arm 62.
The inner sides of the first cam 63 and the second cam 64, which are opposite to each other, are provided with lugs 61 which are evenly spaced along the edge, and the lugs 61 of the first cam 63 and the lugs 61 of the second cam 64 are staggered with each other; the inner sides of the first cam 63 and the second cam 64 are provided with convex rings, and the convex blocks 61 of the first cam 63 and the second cam 64 rotate around the convex rings of the other cam, so that the whole structure of the cam group is more stable, and the rotating track is controllable.
The outer end of the handle arm 62 is provided with a fixing bolt, and the other end of the handle shaft 7 away from the handle locking mechanism 6 is provided with a baffle plate 73. A flat bearing may be provided between the handle arm 62 and the anchor bolt to save on washers, make the design more compact, and reduce edge stresses, improving service life.
When the handle locking mechanism 6 is in a locking state during collapse, the friction force (about 700N) between the retainer 32 and the clamping block 5 is far smaller than the acting force applied to the steering column 1 during explosion of the airbag, so that relative motion is generated, the steel belt 53 is in contact with the handle shaft 7 for extrusion, when the relative acting force between the wedge-shaped block 71 and the wedge-shaped end 54 reaches about 4000N, the rear end of the steel belt 53 is torn to be disconnected with the extension groove 52, the steel belt 53 starts to be inwards bent by the handle shaft 7, and a deformation stage is started; at this stage, the handle shaft 7 gradually enlarges and deforms the steel band 53, thereby providing a stable collapse retention force; the steering column 1 can not fall off in the collapse process, the reaction force with the safety airbag is kept unchanged along the original shaft core direction all the time, and the collapse and energy absorption are stable.
When the adjustment is needed, the handle locking mechanism 6 is placed in an opening state, the axial distance of the cam group is reduced, the retainer 32 is restored to the original shape, and a gap is formed between the retainer and the clamping block 5, so that the adjustment of the steering wheel along with the four directions of height, low, extension and retraction of the upper column tube 2 can be realized; the height adjustment and the low adjustment are that the upper column tube 2 and the handle shaft 7 slide up and down together in the guide hole 321 of the holder 32, and the extension adjustment and the retraction adjustment are that the sliding groove 51 of the clamping block 5 slides relative to the handle shaft 7.
The static crushing force curve of the steering column 1 of the present invention and the steering column 1 of the conventional structure is shown in fig. 8. Static crushing tests show that the stability of the static crushing peak force and the holding force of the invention is obviously superior to that of the traditional structure. The clamping block 5 is a stamping part, and the suction capacity can be adjusted by adjusting the size of the stamping part, so that the clamping block is well matched with an air bag system and a steering wheel system, and finally the aim of reducing the injury of a vehicle to a driver in collision is fulfilled.
The basic idea and the basic principle of the invention have been explained above by way of an introduction to the embodiments listed. The invention is in no way limited to the embodiments listed above. All equivalent changes, improvements, deliberate deteriorations and the like based on the technical scheme of the invention shall fall within the protection scope of the invention.
Claims (9)
1. A collapsing, energy-absorbing and anti-falling structure of a steering column comprises a mounting bracket and a clamping block, wherein the mounting bracket is fixed on a vehicle body and covers an upper column tube; the mounting bracket is provided with a handle shaft transversely penetrating through the sliding grooves, and is characterized in that the front end of the sliding grooves is provided with an extension groove, and a breakable steel belt is arranged in the extension groove; one end of the steel belt facing the sliding chute is a wedge-shaped end; the handle shaft is convexly provided with wedge blocks matched with the wedge ends, and the wedge blocks are symmetrically arranged on the handle shaft; but the breakable formula of one end of steel band connect in the both sides wall of spout and extension groove looks connection portion, the other end integral type is connected in the front end wall of extension groove, just the one end of steel band is the trend that the width diminishes gradually to the other end, form triangular space between the lateral wall of steel band both sides and extension groove.
2. The collapse energy-absorbing and anti-falling structure of a steering column according to claim 1, wherein the distance between the two side walls of the clamping block is equal to or greater than the sum of the lengths of the steel strips in the extension grooves on the two sides.
3. The collapse absorbing and falling preventing structure of a steering column according to claim 1, wherein the thickness of the steel strip is equal to or less than the thickness of the extension groove.
4. The collapse energy-absorbing and anti-falling structure of the steering column according to claim 1, wherein the mounting bracket comprises a fixed frame of a flying wing structure and a retainer of a U-shaped structure, the top of the retainer is fixed on the lower end surface of the middle part of the fixed frame, and two side walls of the retainer are provided with symmetrical guide holes; the clamping block is also of a U-shaped structure, the openings of the retainer and the clamping block are opposite and partially overlap to surround the upper column tube, and the guide hole corresponds to the sliding groove.
5. The collapse energy-absorbing and anti-falling structure of a steering column according to claim 4, wherein a guide block capable of sliding up and down along the guide hole is provided on the handle shaft outside the wedge block.
6. The collapse absorbing and anti-falling structure of a steering column according to claim 4, wherein the handle shaft is transversely penetrated through the guide hole and the sliding groove by a handle locking mechanism.
7. The collapse energy-absorbing and anti-falling structure of a steering column according to claim 6, wherein the handle locking mechanism comprises a cam set and a handle arm, the cam set is sleeved on the handle shaft on any outer side of the retainer, a protruding rectangular block is arranged at the outer end of the cam set, and a rectangular hole matched with the rectangular block is arranged at the upper end of the handle arm; the cam set includes a first cam and a second cam that are relatively rotatable along a handle axis.
8. The collapse absorbing and falling preventing structure of a steering column according to claim 7, wherein the inner sides of the first cam and the second cam facing each other are each provided with projections arranged at regular intervals along the edge, and the projections of the first cam and the projections of the second cam are staggered from each other.
9. The collapse energy absorbing and falling preventing structure of a steering column according to claim 7, wherein the outer end of the handle arm is provided with a fixing bolt, and the other end of the handle shaft away from the handle locking mechanism is provided with a baffle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011088940.2A CN112298335B (en) | 2020-10-13 | 2020-10-13 | Collapse energy-absorbing and anti-falling structure of steering column |
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| CN202011088940.2A CN112298335B (en) | 2020-10-13 | 2020-10-13 | Collapse energy-absorbing and anti-falling structure of steering column |
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| CN112298335A CN112298335A (en) | 2021-02-02 |
| CN112298335B true CN112298335B (en) | 2022-05-03 |
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| CN113212539A (en) * | 2021-05-31 | 2021-08-06 | 重庆长安汽车股份有限公司 | Support mounting structure of steering system |
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| CN110497955A (en) * | 2019-03-11 | 2019-11-26 | 汉腾汽车有限公司 | A kind of shrinkable energy-absorbing electric power-assisted steering tubular column mounting bracket |
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