CN103963834A - Electro-hydraulic power steering mechanism for cars - Google Patents
Electro-hydraulic power steering mechanism for cars Download PDFInfo
- Publication number
- CN103963834A CN103963834A CN201410212653.6A CN201410212653A CN103963834A CN 103963834 A CN103963834 A CN 103963834A CN 201410212653 A CN201410212653 A CN 201410212653A CN 103963834 A CN103963834 A CN 103963834A
- Authority
- CN
- China
- Prior art keywords
- intermediate rod
- chamber
- ecu
- piston
- wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
The invention discloses an electro-hydraulic power steering mechanism for cars, wherein the turning radiuses of front wheels on the left side and the right side can be controlled. The electro-hydraulic power steering mechanism comprises the front wheel on the left side, the front wheel on the right side, a steering wheel and an ECU. The front wheel on the left side is connected with the left end of a left transverse pull rod, the front wheel on the right side is connected with the right end of a right transverse pull rod, and the left transverse pull rod is connected with the right transverse pull rod through an oil cylinder. The electro-hydraulic power steering mechanism has the advantages that the turning radiuses of the front wheels on the left side and the right side can be controlled according to the turning degree of the cars, the driving resistance and tire abrasion in the steering process of the wheels are reduced, and the steering stability of the cars is improved. The electro-hydraulic power steering mechanism is an ideal steering system and is wide in application prospect.
Description
Technical field
The invention belongs to a kind of steering mechanism of motor vehicle, relate in particular to a kind of motorcar electric hydraulic power-assisted steering mechanism.
Background technology
During Vehicle Driving Cycle, chaufeur steering wheel rotation, bearing circle is realized wheel steering by a set of steering hardware, completes vehicle by the direction running of chaufeur driving intention.Desirable wheel steering should be Vehicular turn while travelling wheel be pure rolling, the Turning radius difference of left and right front-wheel also meets desirable Turning radius value, the axes intersect of all wheels, in same point, just can prevent the quick-wearing of crossing that Vehicular turn time channel is faced the additional resistance of running car and caused tire.But the steering hardware of existing vehicle transmits by intermediate rod, intermediate rod is a rigid material, need by changing the geometric parameter of steering trapezium in car steering linkage mechanism, make steering trapezium within the scope of certain wheel angle of inclination, the relation of both sides wheel angle of inclination is just substantially close to ideal relationship.Due to the non-telescoping property of intermediate rod, existing this steering hardware still cannot change axes intersect that himself defect realizes all wheels in same point, cannot meet desirable turn radius.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of left and right sides front-wheel steering radius controlled motorcar electric hydraulic power-assisted steering mechanism.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: motorcar electric hydraulic power-assisted steering mechanism, comprise: left front wheel, right side front vehicle wheel, bearing circle and ECU (Electrical Control Unit) ECU, described left front wheel is connected with the left end of left intermediate rod, described right side front vehicle wheel is connected with the right-hand member of right intermediate rod, between described left intermediate rod and right intermediate rod, by oil cylinder, connect, in described oil cylinder, be respectively arranged with left piston and right piston, described left piston and right piston are separated into A chamber by oil cylinder, B chamber and C chamber, in B chamber between described left piston and right piston, be provided with spring, the two ends of described spring are connected with right piston with left piston respectively, described A chamber and the oil pressure in C chamber are controlled by A chamber switch valve and C chamber switch valve respectively, on described left intermediate rod, be provided with tooth bar, described tooth bar cooperatively interacts with the gear that is arranged on deflecting bar lower end, described bearing circle is by turning to speed reduction gearing to be connected with the upper end of deflecting bar, on the side of described left intermediate rod and right intermediate rod, be respectively arranged with the left intermediate rod displacement pickup and the right intermediate rod displacement pickup that cooperatively interact with it, described left intermediate rod displacement transducer signal, right intermediate rod displacement transducer signal, steering wheel angle signal, steering wheel torque signal, lateral angle acceleration signal, vehicle speed signal, A chamber switch valve and C chamber switch valve are all connected with described ECU (Electrical Control Unit) ECU.
Advantage of the present invention is: above-mentioned motorcar electric hydraulic power-assisted steering mechanism, can be according to turn inside diameter extent control left and right sides front-wheel steering radius, resistance to motion and wear on tyres while reducing wheel steering, improved the road-holding property of automobile, be a kind of desirable steering swivel system, have broad application prospects.
Accompanying drawing explanation
Fig. 1 is the structural representation of motorcar electric hydraulic power-assisted steering mechanism of the present invention.
In figure: 1, left front wheel, 2, right side front vehicle wheel, 3, bearing circle, 4, ECU (Electrical Control Unit) ECU, 5, left intermediate rod, 6, right intermediate rod, 7, oil cylinder, 8, left piston, 9, right piston, 10, A chamber, 11, B chamber, 12, C chamber, 13, spring, 14, A chamber switch valve, 15, C chamber switch valve, 16, tooth bar, 17, deflecting bar, 18, gear, 19, turn to speed reduction gearing, 20, left intermediate rod displacement pickup, 21, right intermediate rod displacement pickup.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, describe in detail particular content of the present invention.
As shown in Figure 1, motorcar electric hydraulic power-assisted steering mechanism, comprise: left front wheel 1, right side front vehicle wheel 2, bearing circle 3 and ECU (Electrical Control Unit) ECU4, described left front wheel 1 is connected with the left end of left intermediate rod 5, described right side front vehicle wheel 2 is connected with the right-hand member of right intermediate rod 6, between described left intermediate rod 5 and right intermediate rod 6, by oil cylinder 7, connect, in described oil cylinder 7, be respectively arranged with left piston 8 and right piston 9, described left piston 8 and right piston 9 are separated into A chamber 10 by oil cylinder 7, B chamber 11 and C chamber 12, in B chamber 11 between described left piston 8 and right piston 9, be provided with spring 13, the two ends of described spring 13 are connected with right piston 9 with left piston 8 respectively, described A chamber 10 and the oil pressure in C chamber 12 are controlled by A chamber switch valve 14 and C chamber switch valve 15 respectively, on described left intermediate rod 5, be provided with tooth bar 16, described tooth bar 16 cooperatively interacts with the gear 18 that is arranged on deflecting bar 17 lower ends, described bearing circle 3 is by turning to speed reduction gearing 19 to be connected with the upper end of deflecting bar 17, on the side of described left intermediate rod 5 and right intermediate rod 6, be respectively arranged with left intermediate rod displacement pickup 20 and the right intermediate rod displacement pickup 21 cooperatively interacting with it, described left intermediate rod displacement transducer signal, right intermediate rod displacement transducer signal, steering wheel angle signal, steering wheel torque signal, lateral angle acceleration signal, vehicle speed signal, A chamber switch valve 14 and C chamber switch valve 15 are all connected with described ECU (Electrical Control Unit) ECU4.
Above-mentioned motorcar electric hydraulic power-assisted steering mechanism, oil cylinder 7 connects left intermediate rod 5 and right intermediate rod 6, between left piston 8 in oil cylinder 7 and right piston 9, by spring 13, connect, left front wheel 1, right side front vehicle wheel 2 when straight-line travelling state spring in free state.On left intermediate rod 5 and right intermediate rod 6, be mounted with respectively left intermediate rod displacement pickup 20, right intermediate rod displacement pickup 21, detect the displacement of left intermediate rod 5 and right intermediate rod 6.ECU (Electrical Control Unit) CEU4 detects the go forward side by side dutycycle of row operation processing controls A chamber switch valve 14 and C chamber switch valve 15 of each sensor signal, realize oil pressure difference in interior each chamber of oil cylinder 7, promote the displacement of left intermediate rod 5 and right intermediate rod 6, complete the different rotational angle of left and right turn wheel, realizing left and right sides wheel flutter can turn to according to theoretical Turning radius, by the thrust of oil cylinder 7, for turning to, provide power-assisted simultaneously.
One, bearing circle 3 turns left
Bearing circle 3 is by turning to speed reduction gearing 19 to drive deflecting bar 17 to rotate, and the pinion and rack of deflecting bar 17 lower ends drives left intermediate rod 5 to move right.ECU (Electrical Control Unit) ECU4 detects dtc signal and the angular signal of bearing circle 3 simultaneously.
When the steering torque of bearing circle 3 is non-vanishing, ECU (Electrical Control Unit) ECU4 is according to the dtc signal of the angular signal of bearing circle 3, bearing circle 3, vehicle speed signal and lateral angle acceleration signal, by ECU (Electrical Control Unit) ECU4's
Internal arithmetic, ECU (Electrical Control Unit) ECU4 output duty cycle is given A chamber 10 fuel feeding of oil cylinder 7 to A chamber switch valve 14, for turning to, provide power-assisted.When the power steering providing when oil cylinder 7 is less than predetermined value, increase the dutycycle that ECU (Electrical Control Unit) ECU4 exports to A chamber switch valve 14, increase the oil pressure in the A chamber 10 of oil cylinder 7; When the power steering providing when oil cylinder 7 is greater than predetermined value, reduce the dutycycle that ECU (Electrical Control Unit) ECU4 exports to A chamber switch valve 14, reduce the oil pressure in the A chamber 10 of oil cylinder 7.
Left intermediate rod displacement pickup 20, right intermediate rod displacement pickup 21 detect respectively the displacement of left intermediate rod 5, right intermediate rod 6, the numerical value of left intermediate rod displacement pickup 20, right intermediate rod displacement pickup 21 passes to ECU (Electrical Control Unit) ECU4, and by computing, draws the steering angle of left front wheel 1, right side front vehicle wheel 2.When front vehicle wheel 2 steering angle of front vehicle wheel 2 steering angles in right side are greater than that left front takes turns that 1 steering angle calculates predetermined right side, it is too fast to be that right side front vehicle wheel 2 turns to, increase the dutycycle of ECU (Electrical Control Unit) ECU4 output to C chamber switch valve 15, the oil pressure that increases the C chamber 12 of oil cylinder 7, reduces right side front vehicle wheel 2 steering angles; When front vehicle wheel 2 steering angle of front vehicle wheel 2 steering angles in right side are less than that left front takes turns that 1 steering angle calculates predetermined right side, it is slow to be that right side front vehicle wheel 2 turned to, reduce the dutycycle of ECU (Electrical Control Unit) ECU4 output to C chamber switch valve 15, reduce the oil pressure in the C chamber 12 of oil cylinder 7, increase the steering angle of right side front vehicle wheel 2.
When bearing circle 3 steering torques are zero, and when steering angle is non-vanishing, now vehicle is back positive status, ECU (Electrical Control Unit) ECU4 closes the dutycycle of A chamber switch valve 14, C chamber switch valve 15, making the oil pressure in the interior A of oil cylinder 7 chamber 10, C chamber 12 is normal pressure, utilizes the spring 13 spring return left front wheels 1 in the interior B of oil cylinder 7 chamber 11, time positive-angle of right side front vehicle wheel 2.Left intermediate rod displacement pickup 20, right intermediate rod position
Displacement sensor 21 detects respectively the displacement of left intermediate rod 5, right intermediate rod 6, the numerical value of left intermediate rod displacement pickup 20, right intermediate rod displacement pickup 21 passes to ECU (Electrical Control Unit) ECU4, and by computing, draws the steering angle of left front wheel 1, right side front vehicle wheel 2.When front vehicle wheel 2 steering angle of front vehicle wheel 2 steering angles in right side are greater than that left front takes turns that 1 steering angle calculates predetermined right side, be that left front wheel 1 time is just too fast, increase the dutycycle that ECU (Electrical Control Unit) ECU4 exports to A chamber switch valve 14, the oil pressure that increases the interior A of oil cylinder 7 chamber 10, reduces left front and takes turns 1 steering angle; When front vehicle wheel 2 steering angle of front vehicle wheel 2 steering angles in right side are less than that left front takes turns that 1 steering angle calculates predetermined right side, it is slow to be that right side front vehicle wheel 2 turned to, increase the dutycycle that ECU (Electrical Control Unit) ECU4 exports to C chamber switch valve 15, increase the oil pressure in the interior C of oil cylinder 7 chamber 12, reduce the steering angle of right side front vehicle wheel 2.
Two, bearing circle 3 turning clockwises
Bearing circle 3 is by turning to speed reduction gearing 19 to drive deflecting bar 17 to rotate, and the pinion and rack of deflecting bar 17 lower ends drives left intermediate rod 5 to be moved to the left.ECU (Electrical Control Unit) ECU4 detects dtc signal and the angular signal of bearing circle 3 simultaneously.
When bearing circle 3 steering torques are when non-vanishing, ECU (Electrical Control Unit) ECU4 is according to bearing circle 3 angular signals, bearing circle 3 dtc signals, vehicle speed signal and lateral angle acceleration signal, by the internal arithmetic of ECU (Electrical Control Unit) ECU4, ECU (Electrical Control Unit) ECU4 output duty cycle is given C chamber 12 fuel feeding of oil cylinder 7 to C chamber switch valve 15, for turning to, provide power-assisted.When the power steering providing when oil cylinder 7 is less than predetermined value, increase the dutycycle that ECU (Electrical Control Unit) ECU4 exports to C chamber switch valve 15, increase the oil pressure in the C chamber 12 of oil cylinder 7; When oil cylinder 7 provides
Power steering while being greater than predetermined value, reduce the dutycycle that ECU (Electrical Control Unit) ECU4 exports to C chamber switch valve 15, reduce the oil pressure in the C chamber 12 of oil cylinder 7.
Left intermediate rod displacement pickup 20, right intermediate rod displacement pickup 21 detect respectively the displacement of left intermediate rod 5, right intermediate rod 6, the numerical value of left intermediate rod displacement pickup 20, right intermediate rod displacement pickup 21 passes to ECU (Electrical Control Unit) ECU4, and by computing, draws the steering angle of left front wheel 1, right side front vehicle wheel 2.When front vehicle wheel 2 steering angle of front vehicle wheel 2 steering angles in right side are greater than that left front takes turns that 1 steering angle calculates predetermined right side, it is too fast to be that right side front vehicle wheel 2 turns to, increase the dutycycle of ECU (Electrical Control Unit) ECU4 output to A chamber switch valve 14, the oil pressure that increases the interior A of oil cylinder 7 chamber 10, reduces right side front vehicle wheel 2 steering angles; When front vehicle wheel 2 steering angle of front vehicle wheel 2 steering angles in right side are less than that left front takes turns that 1 steering angle calculates predetermined right side, it is slow to be that right side front vehicle wheel 2 turned to, reduce the dutycycle of ECU (Electrical Control Unit) ECU4 output to A chamber switch valve 14, reduce the oil pressure in the interior A of oil cylinder 7 chamber 10, increase the steering angle of right side front vehicle wheel 2.
When bearing circle 3 steering torques are zero, and when steering angle is non-vanishing, now vehicle is back positive status, ECU (Electrical Control Unit) ECU4 closes the dutycycle of A chamber switch valve 14, C chamber switch valve 15, making the oil pressure in the interior A of oil cylinder 7 chamber 10, C chamber 12 is normal pressure, utilizes the spring 13 spring return left front wheels 1 in the interior B of oil cylinder 7 chamber 11, time positive-angle of right side front vehicle wheel 2.Intermediate rod displacement pickup 5,8 detects respectively the displacement of arranged on left and right sides intermediate rod 6, the numerical value of left intermediate rod displacement pickup 20, right intermediate rod displacement pickup 21 passes to ECU (Electrical Control Unit) ECU4, and by computing, draws the steering angle of left front wheel 1, right side front vehicle wheel 2.When being greater than left front, front vehicle wheel 2 steering angles in right side take turns predetermined that 1 steering angle calculates
During right side front vehicle wheel 2 steering angle, left front wheel 1 time is just too fast, increases the dutycycle that ECU (Electrical Control Unit) ECU4 exports to C chamber switch valve 15, increases the oil pressure in the interior C of oil cylinder 7 chamber 12, increases right side front vehicle wheel 2 steering angles; When front vehicle wheel 2 steering angle of front vehicle wheel 2 steering angles in right side are less than that left front takes turns that 1 steering angle calculates predetermined right side, it is slow to be that right side front vehicle wheel 2 turned to, increase the dutycycle that ECU (Electrical Control Unit) ECU4 exports to A chamber switch valve 14, increase the oil pressure in the interior A of oil cylinder 7 chamber 10, increase the steering angle of left front wheel 1.
Claims (1)
1. motorcar electric hydraulic power-assisted steering mechanism, it is characterized in that: comprising: left front wheel (1), right side front vehicle wheel (2), bearing circle (3) and ECU (Electrical Control Unit) ECU(4), described left front wheel (1) is connected with the left end of left intermediate rod (5), described right side front vehicle wheel (2) is connected with the right-hand member of right intermediate rod (6), between described left intermediate rod (5) and right intermediate rod (6), by oil cylinder (7), connect, in described oil cylinder (7), be respectively arranged with left piston (8) and right piston (9), described left piston (8) and right piston (9) are separated into A chamber (10) by oil cylinder (7), B chamber (11) and C chamber (12), in B chamber (11) between described left piston (8) and right piston (9), be provided with spring (13), the two ends of described spring (13) are connected with right piston (9) with left piston (8) respectively, described A chamber (10) and the oil pressure of C chamber (12) are controlled by A chamber switch valve (14) and C chamber switch valve (15) respectively, on described left intermediate rod (5), be provided with tooth bar (16), described tooth bar (16) cooperatively interacts with the gear (18) that is arranged on deflecting bar (17) lower end, described bearing circle (3) is by turning to speed reduction gearing (18) to be connected with the upper end of deflecting bar (17), on the side of described left intermediate rod (5) and right intermediate rod (6), be respectively arranged with left intermediate rod displacement pickup (20) and the right intermediate rod displacement pickup (21) cooperatively interacting with it, described left intermediate rod displacement transducer signal, right intermediate rod displacement transducer signal, steering wheel angle signal, steering wheel torque signal, lateral angle acceleration signal, vehicle speed signal, A chamber switch valve (14) and C chamber switch valve (15) all with described ECU (Electrical Control Unit) ECU(4) be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410212653.6A CN103963834A (en) | 2014-05-20 | 2014-05-20 | Electro-hydraulic power steering mechanism for cars |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410212653.6A CN103963834A (en) | 2014-05-20 | 2014-05-20 | Electro-hydraulic power steering mechanism for cars |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103963834A true CN103963834A (en) | 2014-08-06 |
Family
ID=51233957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410212653.6A Pending CN103963834A (en) | 2014-05-20 | 2014-05-20 | Electro-hydraulic power steering mechanism for cars |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103963834A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104354761A (en) * | 2014-11-27 | 2015-02-18 | 盐城市步高汽配制造有限公司 | Pure electric motor bus electric control hydraulic boosting steering system |
| CN107902035A (en) * | 2017-11-13 | 2018-04-13 | 淮阴工学院 | A kind of detachable electric-powered infant car |
| CN110015342A (en) * | 2019-05-14 | 2019-07-16 | 湖北汽车工业学院 | A fault emergency device and control method for steering-by-wire |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0616145A (en) * | 1992-03-27 | 1994-01-25 | Aisin Seiki Co Ltd | Hydrostatic power steering device |
| US20090038876A1 (en) * | 2006-10-13 | 2009-02-12 | Hitachi, Ltd. | Steering System |
| DE69738569T2 (en) * | 1997-08-13 | 2009-03-26 | Jtekt Corp. | POWER STEERING |
| CN101746411A (en) * | 2008-12-16 | 2010-06-23 | 日产自动车株式会社 | Steering control apparatus |
| CN102616273A (en) * | 2012-03-03 | 2012-08-01 | 浙江万达汽车方向机有限公司 | Low-energy consumption electronic hydraulic power-assisted steering system and control method thereof |
| CN102897215A (en) * | 2012-09-17 | 2013-01-30 | 江苏大学 | Electronically-controlled hydraulic power-assisted steering device with controllable steering radiuses of front wheels |
| CN203854716U (en) * | 2014-05-20 | 2014-10-01 | 盐城振宇科技发展有限公司 | Automotive electric hydraulic power-assisted steering mechanism |
-
2014
- 2014-05-20 CN CN201410212653.6A patent/CN103963834A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0616145A (en) * | 1992-03-27 | 1994-01-25 | Aisin Seiki Co Ltd | Hydrostatic power steering device |
| DE69738569T2 (en) * | 1997-08-13 | 2009-03-26 | Jtekt Corp. | POWER STEERING |
| US20090038876A1 (en) * | 2006-10-13 | 2009-02-12 | Hitachi, Ltd. | Steering System |
| CN101746411A (en) * | 2008-12-16 | 2010-06-23 | 日产自动车株式会社 | Steering control apparatus |
| CN102616273A (en) * | 2012-03-03 | 2012-08-01 | 浙江万达汽车方向机有限公司 | Low-energy consumption electronic hydraulic power-assisted steering system and control method thereof |
| CN102897215A (en) * | 2012-09-17 | 2013-01-30 | 江苏大学 | Electronically-controlled hydraulic power-assisted steering device with controllable steering radiuses of front wheels |
| CN203854716U (en) * | 2014-05-20 | 2014-10-01 | 盐城振宇科技发展有限公司 | Automotive electric hydraulic power-assisted steering mechanism |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104354761A (en) * | 2014-11-27 | 2015-02-18 | 盐城市步高汽配制造有限公司 | Pure electric motor bus electric control hydraulic boosting steering system |
| CN107902035A (en) * | 2017-11-13 | 2018-04-13 | 淮阴工学院 | A kind of detachable electric-powered infant car |
| CN110015342A (en) * | 2019-05-14 | 2019-07-16 | 湖北汽车工业学院 | A fault emergency device and control method for steering-by-wire |
| CN110015342B (en) * | 2019-05-14 | 2023-12-29 | 湖北汽车工业学院 | Fault emergency device for steer-by-wire and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101716952B (en) | Electronic differential steering control system for realizing four-wheel steering by four-hub motor driving for electrical vehicle | |
| CN105416392B (en) | A kind of push-down composite turning system and its mode switch control method | |
| CN102069843B (en) | Wire controlled wheel independent steering execution mechanism and wheel assembly | |
| CN102180194A (en) | Adaptive steering system of timely four-wheel drive electric wheel automobile and control method thereof | |
| CN203854716U (en) | Automotive electric hydraulic power-assisted steering mechanism | |
| CN104354759A (en) | Novel four-wheel steering gear of trackless transfer vehicle | |
| CN102975764A (en) | Ackerman steering mechanism | |
| CN103496396A (en) | Novel energy-saving differential power-assisted steering system of electric wheel automobile and control method thereof | |
| CN102874306A (en) | Motor steering purely-rolling device | |
| CN102372029A (en) | Electronically controlled all-wheel steering system for multi-axis vehicles | |
| CN106428204A (en) | Driving combined steering system, torque control device and torque control method | |
| CN103569197A (en) | Four-wheel steering system and control method thereof | |
| CN105292251A (en) | Four-wheel steering system for automobile | |
| CN103963834A (en) | Electro-hydraulic power steering mechanism for cars | |
| CN109466626B (en) | Full-drive full-steering special truck chassis | |
| CN102923186A (en) | Compensation control device of electric hydraulic power steering system of automobile | |
| CN104843059A (en) | Steering system of multi-axle vehicle, and multi-axle vehicle | |
| CN206589959U (en) | A kind of multi-mode composite turning genealogical classification controller | |
| CN206589958U (en) | A kind of active composite turning system and torque control unit | |
| CN102897215A (en) | Electronically-controlled hydraulic power-assisted steering device with controllable steering radiuses of front wheels | |
| CN205113423U (en) | Car four wheel steering system based on rear wheel independently turns to | |
| CN111183724B (en) | Steering transmission device of double-front-axle steering wheel type off-road vehicle | |
| CN202923712U (en) | Electronic control hydraulic power steering device with controllable front-wheel steering radius | |
| CN201086737Y (en) | Automobile Steering Servo Control System | |
| CN201354098Y (en) | Loader synchronous steering gear used for articulated vehicle frames |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140806 |