CN104843053B - Steering gear, automobile steering system and the automobile of automobile steering system - Google Patents
Steering gear, automobile steering system and the automobile of automobile steering system Download PDFInfo
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- CN104843053B CN104843053B CN201410320359.7A CN201410320359A CN104843053B CN 104843053 B CN104843053 B CN 104843053B CN 201410320359 A CN201410320359 A CN 201410320359A CN 104843053 B CN104843053 B CN 104843053B
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- steering
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- sun gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
- Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
- Structure Of Transmissions (AREA)
Abstract
The invention discloses a kind of steering gear of automobile steering system, automobile steering system and automobile, the steering gear of the automobile steering system includes turning to input shaft, and the steering input shaft is used for the steering torque that reception comes from steering wheel (300)；With steering actuator (200), the steering actuator (200) is used for the steering for driving steered wheel.Wherein, the steering gear also includes gearratio adjusting means (100), and the steering input shaft is connected by the gearratio adjusting means (100) and the steering actuator (200).By the solution of the present invention, automobile can be realized with less steering wheel angle in low speed and is rapidly converting to, and can realize that safety turns to larger steering wheel angle in high speed, and keep the stability and security of running car.
Description
Technical field
The present invention relates to automotive field, in particular it relates to a kind of steering gear of automobile steering system, automobile steering system with
And automobile.
Background technology
Steering is the important component of automobile, and steering is for changing or keeping the one of vehicle traveling direction
Equipment series, wherein, the ratio between steering angle of steering wheel and steered wheel is steering gear ratio.
(referring to Fig. 1) in existing steering, input shaft A is connected with former steering gear B, so as to steering wheel to bogie car
The steering gear ratio of wheel is fixed, when running at a low speed, typically realizes light steering by reducing the damping of steering,
And when running at high speed, typically ensure to turn to safely by increasing the damping of steering.However, driver is in actual driving
During automobile, it is desirable to which automobile can be realized with less steering wheel angle in low speed and is rapidly converting to, and can be kept in high speed
The stability and security of running car.The steering gear of existing fixed drive ratio, it is clear that these demands can not be met.
A kind of in view of disadvantages mentioned above of prior art, it is desirable to provide new technical scheme on automobile steering system.
The content of the invention
It is an object of the invention to provide a kind of motor turning that can change steering wheel to the steering gear ratio of steered wheel
The steering gear of system.
To achieve these goals, the present invention provides a kind of steering gear of automobile steering system, and it includes：
Input shaft is turned to, the steering input shaft is used to receive the steering torque for coming from steering wheel；With
Steering actuator, the steering actuator are used for the steering for driving steered wheel；
The steering gear includes gearratio adjusting means, the steering input shaft by the gearratio adjusting means with it is described
Steering actuator is connected.
Preferably, the gearratio adjusting means includes：
Planetary gears, the planetary gears include and first sun gear for turning to input axis connection and institute
State the second sun gear of steering actuator connection and be engaged between first sun gear and the second sun gear and by going
The planetary gear that carrier rotatably supports；
Adjustment unit, the adjustment unit include being connected with the motor of speed governing driving gear, the speed governing driving gear with it is described
Gear engages planet carrier each other；With
Locking system, the locking system can carry out locking or unblock to the planet carrier.
Preferably, first sun gear is coaxial with second sun gear is set and positioned at described planetary two
Side, the planetary central axial direction are perpendiculared to one another with the central axial direction of first sun gear, the planet
The speed governing driven gear engaged with the speed governing driving gear is provided with frame.
Preferably, when automobile driving speed is more than 30km/h and is less than 70km/h, the planet carrier locking.
Preferably, when automobile driving speed is less than and is equal to 30km/h, the steering wheel drives first sun gear
Rotate and make the electric motor starting, so by the speed governing driving gear drive the planet carrier with first sun gear
Opposite rotation direction rotates.
Preferably, when automobile driving speed is more than and is equal to 70km/h, the steering wheel drives first sun gear
Rotate and make the electric motor starting, so by the speed governing driving gear drive the planet carrier with first sun gear
Identical rotation direction rotates.
Preferably, the steering gear also includes housing, planetary gear shaft that the planet carrier includes being fixed as one, first
Planetary crust and the second planetary crust, first planetary crust, the second planetary crust are to be rotatably installed in the housing and position
In the planetary gear shaft both sides, sky of first sun gear between first planetary crust and the planetary gear shaft
Between in, in space of second sun gear between the planetary gear shaft and second planetary crust, the planet tooth
Wheel is placed in the planetary gear shaft, and the speed governing driven gear and second planetary crust are integral type structure.
Preferably, the steering actuator is recirculating ball-type steering.
The present invention a kind of automobile steering system is also provided, it include the steering gear of above-mentioned automobile steering system, with it is described
The steered wheel for turning to the steering wheel of input axis connection and being connected with the steering actuator.
The present invention also provides a kind of automobile in addition, and it includes above-mentioned automobile steering system.
Using above-mentioned technical proposal, input shaft will be turned to and connected by gearratio adjusting means and steering actuator transmission
Connect, so as to realize the change of the steering gear ratio between steering wheel and steered wheel.By the solution of the present invention, automobile is in low speed
It can be realized and be rapidly converting to less steering wheel angle, and can realize that safety turns with larger steering wheel angle in high speed
To, and keep the stability and security of running car.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the sectional view of the steering gear of prior art；
Fig. 2 is the sectional view of the steering gear of the automobile steering system of the present invention；
Fig. 3 is the structural representation of the steering gear of the automobile steering system of the present invention；
Fig. 4 is the sectional view of Fig. 3 gearratio adjusting means；
Fig. 5 is the sectional view of Fig. 3 steering actuator；
Fig. 6 is the operating diagram of the steering gear of automobile steering system when automobile low speed turns to；
Fig. 7 is the operating diagram of the steering gear of automobile steering system when automobile middling speed turns to；
Fig. 8 is the operating diagram of the steering gear of automobile steering system when automobile high-speed turns to.
Description of reference numerals
A input shaft B original steering gears
The steering actuator of 100 gearratio adjusting means 200
300 steering wheels 1 input semiaxis
The planetary gear of 2 first sun gear 3
The output axle shaft of 4 planetary gear shaft 5
The speed governing driving gear of 6 second sun gear 7
The motor of 8 speed governing driven gear 9
The bearing of 10 first planetary crust 11
The housing of 12 Thurst washer 13 first
The screw rod of 14 second housing 15
The steering actuator housing of 16 ball nut's frame 17
18 sector gears
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
As shown in Fig. 2 the present invention provides a kind of steering gear of automobile steering system, the steering gear include turning to input shaft,
Gearratio adjusting means 100 and steering actuator 200.Input shaft is turned to be used to receive the steering torsion for coming from steering wheel 300
Square, turn to input shaft and be connected by the gearratio adjusting means 100 with steering actuator 200, steering actuator 200
For driving the steering of steered wheel.Wherein, automobile refers to by gasoline, diesel oil, natural gas or with battery, solar energy etc. to be
Means of transport of the engine of the energy as power.The present invention will turn to input shaft and be performed by gearratio adjusting means with turning to
Device is connected, and so as to realize the change of the steering gear ratio between steering wheel and steered wheel, and causes automobile in low speed
It can be realized and be rapidly converting to less steering wheel angle, and can realize that safety turns with larger steering wheel angle in high speed
To, and keep the stability and security of running car.Wherein, in the present embodiment, refer at a high speed travel speed be more than and
Equal to 70km/m, low speed refers to that travel speed is less than and is equal to 30km/m.And when entire vehicle design matches, vehicle speed range can root
According to being actually needed reset.
Specifically, as shown in Figure 3 and Figure 4, in present embodiment gearratio adjusting means 100 include planetary gears,
Adjustment unit and locking system.Planetary gears includes performing dress with the first sun gear 2 for turning to input axis connection and steering
Put the second sun gear 6 of 200 connections and be engaged between the first sun gear 2 and the second sun gear 6 and rotatable by planet carrier
The planetary gear 3 of ground support.Planetary gear 3 is driven relative to the first sun gear 2 and the second sun gear 6 by the rotation of planet carrier
Rotate, and change the gearratio between the first sun gear 2 and the second sun gear 6, and realize between steering wheel and steered wheel
The regulation of steering gear ratio.Adjustment unit includes being connected with the motor 9 of speed governing driving gear 7, the speed governing driving gear 7 and planet
Gear engages frame each other.Motor 9 drives planet carrier to rotate by speed governing driving gear 7, and the rotation direction of motor 9 and rotation speed
Degree determines according to the travel speed of automobile.
Wherein, locking system can carry out locking or unblock to planet carrier, and high speed steering or low speed are carried out in automobile
During steering, locking system unlocks to planet carrier so that planet carrier can rotate under motor driven, and turn when automobile carries out middling speed
To, it is static or straight trip when, it is not necessary to the steering gear ratio of automobile is changed, it is necessary to be entered by locking system to planet carrier
Row locking, change the steering gear ratio of automobile to prevent planet carrier from rotating.Present embodiment is preferably that motor 9 carries locking dress
Put, and cause the locking of speed governing driving gear 7, so that planet carrier locking.Or locking system can also be limitation speed governing active
The device that gear 7 or planet carrier rotate, and the locking system can as needed with speed governing driving gear 7 or planet bridge joint
Touch or depart from.
Above-mentioned planetary gears can have diversified forms, and as a preferred embodiment, such as Fig. 3 and Fig. 4
Shown, the first sun gear 2 is with the 6 coaxial setting of the second sun gear and positioned at the both sides of planetary gear 3, the central shaft of planetary gear 3
Line direction is perpendiculared to one another with the central axial direction of the first sun gear 2, is provided with what is engaged with speed governing driving gear 7 on planet carrier
Speed governing driven gear 8.Wherein, the first sun gear 2 is fixedly installed in one end of input semiaxis 1 by key (such as spline), and defeated
Enter the other end of semiaxis 1 with turning to input axis connection；And the second sun gear 6 is fixedly installed in output half by key (such as spline)
One end of axle 5, and the other end of output axle shaft 5 is connected with steering actuator 200.Speed governing driving gear 7 is driven by speed governing
Gear 8 drives planet carrier to be rotated around the central axis of the first sun gear 2.
From the movement relation of epicyclic train, the rotating speed of the second sun gear 6 is the first sun gear 2 and planet carrier rotating speed
Superposition.The rotating speed of the first sun gear 2 is set as ω1, the rotating speed of the second sun gear 6 is ω2, the rotating speed of planet carrier is ω3, by
Knowable to the movement relation of epicyclic train, ω1+ω2=2 ω3.When planet carrier locking, ω3=0, now ω1=﹣ ω2, i.e.,
The rotating speed of one sun gear 2 and the second sun gear 6 is equal in magnitude, in the opposite direction；When pinion frame rotates, ω3≠ 0, now
ω1=2 ω3﹣ ω2, i.e. the rotating speed size of the first sun gear 2 and the second sun gear 6 is unequal, be achieved in the first sun gear 2 with
The change of rotating speed size between second sun gear 6, so as to change the steering gear ratio between steering wheel and steered wheel.
Preferably, steering gear may also include housing (being specially the first housing 13 and the second housing 14), and planet carrier includes solid
Be set to integral planetary gear shaft 4, the first planetary crust 10 and the second planetary crust, the first planetary crust 10, the second planetary crust is can
It is rotatably mounted in housing and is located at the both sides of planetary gear shaft 4.First sun gear 2 is located at the first planetary crust 10 and planetary gear
In space between axle and the pivot center of the first planetary crust 10 overlaps with the central axis of the first sun gear 2, the second sun gear 6
In space between the planetary crust of planetary gear shaft 4 and second and the pivot center of the second planetary crust and the second sun gear 6
Central axis overlaps.First planetary crust 10 and the second planetary crust are fixed by fastener (such as bolt), and planetary gear shaft 4 passes through
Bolt is fixed between the first planetary crust 10 and the second planetary crust.Planetary gear 3 is placed in planetary gear shaft 4, planetary gear
Axle 4 is multi-diameter shaft, the convenient axially position to planetary gear 3, it is preferable that two can be symmetrically arranged in planetary gear shaft 4
Planetary gear 3, and make the transmission of planetary gears more stable, the quantity of certain planetary gear 3 can also be four, specific number
Amount can be set according to demand.
In addition, in order to save space, the planetary crust of speed governing driven gear 8 and second is integral type structure, also can be arranged such
The assembly technology of speed governing driven gear 8 and the second planetary crust is enough reduced, and then reduces processing cost.And turn to further reduce
To the size of device, speed governing driving gear 7 and speed governing driven gear 8 preferably use hyperboloid conical gear.First planetary crust 10
Between the first housing 13, bearing 11 is provided between the second planetary crust and the second housing 14, and ensures planetary gears and runs
Stability.Thrust is equipped between first planetary crust 10 and the first sun gear 2, between the second planetary crust and the second sun gear 6
Pad 12, for preventing the excessive friction of planetary gears, also allow for the gap adjustment in planetary gears.
In addition, steering actuator 200 is recirculating ball-type steering, wherein, recirculating ball-type steering can be divided into circulating ball-
Rack tooth fans formula steering gear and reciprocating ball lever and peg steering gear, and preferably circulating ball-rack tooth fans formula in the present embodiment
Steering gear.As shown in figure 5, steering actuator 200 includes steering actuator housing 17 and located at steering actuator housing
The recirculating ball-rack and sector steering gear that (being specially to be connected with output axle shaft 5) is connected with the second sun gear 6 in 17, is turned to
The housing 14 of performs device housing 17 and second is fixed by fastener (such as bolt).Recirculating ball-rack and sector steering gear bag
Include and set between screw rod 15, sector gear 18, the ball nut's frame 16 and screw rod 15 and ball nut's frame 16 that are sheathed on screw rod 15
There are multiple steel balls, the outside of ball nut's frame 16 is provided with the latch engaged with sector gear, and the one end of screw rod 15 connects with output axle shaft 5
Connect, the rotation direction of screw rod 15 is dextrorotation.Because the rotation direction of the first sun gear 2 and the second sun gear 6 is on the contrary, in present embodiment
Screw rod is oppositely oriented in the rotation direction of middle screw rod 15 and conventional recycle ball-rack tooth fan formula steering gear, and causes steered wheel
Rotation direction is consistent with the rotation direction of steering wheel 300.And when being driven using the planetary gears of other forms, if
First sun gear 2 is consistent with the rotation direction of the second sun gear 6, then in recirculating ball-rack and sector steering gear screw rod rotation direction
It is still identical with traditional installation form.
Carried out specifically below with reference to the course of work of steering gear of the accompanying drawing to the automobile steering system of present embodiment
It is bright.As shown in fig. 7, when automobile driving speed is more than 30km/h and is less than 70km/h (middling speed), planet carrier locking (is specially electricity
The locking of machine 9), steering wheel 300 drives the first sun gear 2 to rotate, and the rotating speed of the second sun gear 6 is equal to the rotating speed of the first sun gear 2,
Second sun gear 6 drives steered wheel to turn to by the steering actuator 200, wherein, the first sun gear 2 and second sun
The gearratio of wheel 6 is i, and i=1.
As shown in fig. 6, when automobile driving speed is less than and is equal to 30km/h (low speed), now requirement can be with less
Steering wheel angle realizes automobile quick direction changing.When steering wheel rotation 300, steering wheel 300 drives the first sun gear 2 to rotate, electricity
Machine 9 enters starting state by locking, and motor 9 drives planet carrier to turn with opposite with the first sun gear 2 by speed governing driving gear 7
Dynamic direction rotates, and the rotating speed of the first sun gear 2 is transferred to the second sun gear 6 so that second too after being superimposed with planet carrier rotating speed
The rotating speed of sun wheel 6 is more than the rotating speed of the first sun gear 2, and the second sun gear 6 drives bogie car to rotate by steering actuator 200
To making steered wheel produce larger steering angle (relative to the steering gear of fixed drive ratio), arrived so as to change steering wheel 300
The steering gear ratio of steered wheel.Wherein, the gearratio of the first sun gear 2 and the second sun gear 6 is i1, and i1=ω1/(ω1+
2ω3) ＜ 1.When steering wheel stops operating, motor 9 is soon locked out, in such a mode, between steering wheel and steered wheel
Steering gear ratio become initial value again.
As shown in figure 8, when automobile driving speed is more than and is equal to 70km/h (high speed), now requirement can keep travelling
Stability and security, prevent from influenceing the stabilization of running car because of the trickle action of steering wheel 300.Work as steering wheel rotation
When 300, steering wheel 300 drives the first sun gear 2 to rotate, and motor 9 enters starting state by locking, and motor 9 passes through speed governing active
Gear 7 drives planet carrier to be rotated with the identical rotation direction of the first sun gear 2, the rotating speed warp and planet carrier of the first sun gear 2
Rotating speed superposition after, be transferred to the second sun gear 6 so that the rotating speed of the second sun gear 6 be less than the first sun gear 2 rotating speed, second
Sun gear 6 drives steered wheel to turn to by steering actuator 200, makes bogie car (relative to the steering gear of fixed drive ratio)
Wheel produces less steering angle, so as to change the steering gear ratio that steering wheel 300 arrives steered wheel.Wherein, the first sun gear 2
Gearratio with the second sun gear 6 is i2, and i2=ω1/(ω1-2ω3) ＞ 1.It is right when deliberate action occurs in steering wheel 300
The influence of steered wheel is reduced to minimum, so as to improve the stability of running car and security.When steering wheel 300 stops operating
When, motor 9 is soon locked out, and in such a mode, the steering gear ratio between steering wheel and steered wheel becomes initial value again.
The present invention also provides a kind of automobile steering system, and it includes the steering gear of above-mentioned automobile steering system, with turning to
The steered wheel for inputting the steering wheel 300 of axis connection and being connected with steering actuator 200.
In addition, the present invention also provides a kind of automobile, it includes above-mentioned automobile steering system.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (7)
1. the steering gear of automobile steering system, the steering gear includes：
Input shaft is turned to, the steering input shaft is used for the steering torque that reception comes from steering wheel (300)；With
Steering actuator (200), the steering actuator (200) are used for the steering for driving steered wheel, it is characterised in that
The steering gear includes gearratio adjusting means (100), and the steering input shaft passes through the gearratio adjusting means (100)
It is connected with the steering actuator (200), wherein,
The gearratio adjusting means (100) includes：
Planetary gears, the planetary gears include with it is described turn to input axis connection the first sun gear (2), with it is described
The second sun gear (6) and be engaged on first sun gear (2) and the second sun gear that steering actuator (200) connects
(6) planetary gear (3) rotatably supported between and by planet carrier；
Adjustment unit, the adjustment unit include being connected with the motors (9) of speed governing driving gear (7), the speed governing driving gear (7) with
Gear engages the planet carrier each other；With
Locking system, the locking system can carry out locking or unblock to the planet carrier；
Wherein, first sun gear (2) is coaxial with second sun gear (6) is set and positioned at the planetary gear (3)
Both sides, the central axial direction of the planetary gear (3) are perpendiculared to one another with the central axial direction of first sun gear (2),
The speed governing driven gear (8) engaged with the speed governing driving gear (7) is provided with the planet carrier, the steering gear also includes
Housing (13,14), the planet carrier include planetary gear shaft (4), the first planetary crust (10) and the second planet being fixed as one
Shell, first planetary crust (10), the second planetary crust are to be rotatably installed in the housing (13,14) and positioned at described
Planetary gear shaft (4) both sides, first sun gear (2) is between first planetary crust (10) and the planetary gear shaft
Space in, in space of second sun gear (6) between the planetary gear shaft (4) and second planetary crust,
The planetary gear (3) is placed in the planetary gear shaft (4), the speed governing driven gear (8) and second planetary crust
For integral type structure.
2. steering gear according to claim 1, it is characterised in that when automobile driving speed is more than 30km/h and is less than
During 70km/h, the planet carrier locking.
3. steering gear according to claim 1, it is characterised in that when automobile driving speed is less than and is equal to 30km/h,
The steering wheel (300) drives first sun gear (2) to rotate and starts the motor (9), and then passes through the speed governing
Driving gear (7) drives the planet carrier to be rotated with the rotation direction opposite with first sun gear (2).
4. steering gear according to claim 1, it is characterised in that when automobile driving speed is more than and is equal to 70km/h,
The steering wheel (300) drives first sun gear (2) to rotate and starts the motor (9), and then passes through the speed governing
Driving gear (7) drives the planet carrier to be rotated with the first sun gear (2) identical rotation direction.
5. steering gear according to claim 1, it is characterised in that the steering actuator (200) turns for circulating ball type
To device.
6. automobile steering system, it is characterised in that the automobile steering system includes the automobile described in claim any one of 1-5
The steering gear of steering, with it is described turn to input axis connection steering wheel (300) and with the steering actuator (200)
The steered wheel of connection.
7. automobile, it is characterised in that the automobile includes the automobile steering system described in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410320359.7A CN104843053B (en) | 2014-07-04 | 2014-07-04 | Steering gear, automobile steering system and the automobile of automobile steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410320359.7A CN104843053B (en) | 2014-07-04 | 2014-07-04 | Steering gear, automobile steering system and the automobile of automobile steering system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104843053A CN104843053A (en) | 2015-08-19 |
| CN104843053B true CN104843053B (en) | 2018-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410320359.7A Active CN104843053B (en) | 2014-07-04 | 2014-07-04 | Steering gear, automobile steering system and the automobile of automobile steering system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109895840A (en) * | 2017-12-07 | 2019-06-18 | 宝沃汽车（中国）有限公司 | The adjustable steering column of turning rate and the vehicle with it |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6575265B2 (en) * | 2000-03-30 | 2003-06-10 | Delphi Technologies, Inc. | Linear differential assisted controlled steering |
| CN201261490Y (en) * | 2008-06-23 | 2009-06-24 | 重庆工学院 | Variable steering transmitting ratio electric power-assisted steering system |
| CN202011420U (en) * | 2011-04-22 | 2011-10-19 | 南京航空航天大学 | Electric power-assisted steering system with real-time variable transmission ratio |
| CN202431846U (en) * | 2011-11-25 | 2012-09-12 | 比亚迪股份有限公司 | Variable-transmission-ratio transmission device and automotive steering system with same |
| CN103121466B (en) * | 2013-02-25 | 2015-05-20 | 南京航空航天大学 | Arc linear motor power-assisted steering system and road feel control method thereof |
| CN103253297B (en) * | 2013-05-29 | 2015-11-18 | 长城汽车股份有限公司 | For vehicle steering swivel system and there is the vehicle of this steering swivel system |
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| CN104843053A (en) | 2015-08-19 |
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