CN104709344B - Semi-integral type hydraulic power-assisted multi-axle steering system and control method thereof - Google Patents
Semi-integral type hydraulic power-assisted multi-axle steering system and control method thereof Download PDFInfo
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- CN104709344B CN104709344B CN201410758320.3A CN201410758320A CN104709344B CN 104709344 B CN104709344 B CN 104709344B CN 201410758320 A CN201410758320 A CN 201410758320A CN 104709344 B CN104709344 B CN 104709344B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention discloses a semi-integral type hydraulic power-assisted multi-axle steering system and a control method thereof. The steering system comprises a steering wheel, a semi-integral type hydraulic power-assisted steering device, a full-hydraulic steering device, a first steering pump, a second steering pump, an oil tank and at least two steering axles; the semi-integral type hydraulic power-assisted steering device comprises a mechanical steering device and a sliding valve, the sliding valve is connected with a first steering power-assisted cylinder and a first steering pump of the first front axle, and an input screw connected with a valve element of the sliding valve and a piston in threaded connection with the input screw through a steel ball are arranged in an outer shell of the mechanical steering device; the full-hydraulic steering device is connected with a second steering power-assisted cylinder and a second steering pump of the second front axle, an output screw is in threaded connection to the piston through the steel ball, a lower cover is fixed to the outer shell of the mechanical steering device, and the output screw is installed on the lower cover through a bearing and is connected with the full-hydraulic steering device. By means of the structure, the piston is matched with the output screw to transmit power to the full-hydraulic steering device, and simultaneous steering of the front axle and the back axle can be guaranteed.
Description
Technical field
The present invention relates to automobile steering system, particularly a kind of semi-monolithic formula hydraulic booster multi-axle steering system and its control
Method.
Background technology
Many bridge cars turn to difficulty as loading capacity is big, vehicle body length causes radius of turn big, and such vehicle typically adopts many bridges
Even rear-axle steering is turned to solving this problem, propons steering technique is successfully applied, such as：Circulating ball type hydraulic pressure is moved
Power steering gear and servo-cylinder cooperation, semi-integral type hydraulic assistance steering device and servo-cylinder cooperation, all-hydraulic steering gear and servo-cylinder
The technologies such as cooperation, this technology can realize the steering of first, second and third propons；But rear-axle steering is due to installation site
Particularity, implement it is more complicated, typically using following several forms：One kind is using import recuperation valve centering cylinder type
Rear-axle steering system, this solution technique are ripe, but very high to the design and installation requirement of steering mechanism, and cost is also very high, and
And can not realize turning to while many propons and back axle；Another kind is the structure control back axle coordinated using hydraulic cylinder and long leverage
Turn to, this scheme leverage is very long, design arrangement is difficult, and it is poor to easily cause Steering sensitivity, there is presently no this technology
Apply on car load；Semi-integral type hydraulic assistance steering device has been obtained in large-tonnage wheeled crane, many bridge special purpose vehicle generally
Application, it is possible to achieve many propons are simultaneously turned to, and are increased on this basis and can be used with the all-hydraulic steering gear of controlled output flow
In the control of rear-axle steering pressure and flow, rear-axle steering is realized, reach and turn to flexible, simple, the easily manufactured, low cost of design
The characteristics of.However, in actual applications, the difference on effect that different structure designs is brought is very big, such as：By all-hydraulic steering gear
In parallel by a lose-lose angle of departure steering gear with semi-integral type hydraulic assistance steering device, i.e., steering wheel connection lose-lose angle of departure is turned to
Device, two outfans, one connection all-hydraulic steering gear of angle steering gear, another connection semi-integral type hydraulic assistance steering device,
This mode there is hysteresis in Vehicular turn；Its reason is that rising for semi-integral type hydraulic assistance steering device presses through journey and be
Gap is eliminated first, then guiding valve is just mobile, often steering gear outfan in angle drives turning for semi-integral type hydraulic assistance steering device
Guiding valve could be opened after 90 ° or so are rotated to screw rod and propons is controlled and start to turn to, and all-hydraulic steering gear is defeated in angle steering gear
End supplies hydraulic oil immediately to back axle after rotating, thus there is a problem of that propons can not be while turn to back axle.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention to provide the semi-monolithic that a kind of achievable propons is turned to back axle simultaneously
Formula hydraulic booster multi-axle steering system and its control method.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of semi-monolithic formula hydraulic booster multi-axle steering system, including the semi-monolithic formula liquid of steering wheel and steering wheel connection
Pressure power-assisted steering device, all-hydraulic steering gear, the first steering pump, the second steering pump, fuel tank and at least two steeraxles, the first propons
Including the first steering actuation cylinder, back axle includes the second steering actuation cylinder, and the semi-integral type hydraulic assistance steering device includes machinery
Steering gear, and the guiding valve being connected with manual steering gear, guiding valve are connected with the first described steering actuation cylinder, the first steering pump respectively
Connect, the inside the shell of the manual steering gear is provided with gear piston assembly, and gear piston assembly includes what is be connected with the valve element of guiding valve
Input screw rod, and the piston with tooth bar being connected with input screw flight by steel ball, the tooth bar engagement are connected with rocker arm shaft,
The all-hydraulic steering gear is connected with the second described steering actuation cylinder, the second steering pump respectively, and the piston passes through steel ball spiral shell
Stricture of vagina is connected with output screw, and the shell of the manual steering gear is fixedly connected with lower cover, and the output screw corresponds to the another of piston
One end is arranged on lower lid by bearing and the end of output screw is connected with described all-hydraulic steering gear.
As the improvement of above-mentioned technical proposal, it is described under be covered with insertion manual steering gear inside the shell the first positioning it is outer
Circle, first positioning it is cylindrical be provided between the outer casing inner wall be socketed in the first positioning it is cylindrical on the first sealing ring.
Further, the end of the lower cover is provided with for compressing the plug screw of bearing, is provided with and is easy to output in the middle part of plug screw
The via that screw rod is passed through, is provided with the oil sealing being socketed on output screw between the plug screw and output screw, the plug screw with
The second sealing ring being socketed on plug screw is provided between lower cover.
Further, connector, the rear and front end point of the connector are installed between the all-hydraulic steering gear and lower cover
Be not provided with the prelocalization cavity and rear located cavity being connected, it is described under to be covered with the second positioning coordinated with prelocalization cavity outer
Circle, the all-hydraulic steering gear are provided with the positioning boss coordinated with rear located cavity.
Further, the connector is connected with all-hydraulic steering gear by hexagon socket head cap screw, and connector periphery is provided with installation
Flange, mounting flange are connected with lower cover by outer-hexagonal bolt.
Further, return to neutral mechanism is housed between the guiding valve and manual steering gear, the return to neutral mechanism includes connecting guiding valve
With connector in the returning of manual steering gear, and flange is returned on input screw rod, the guiding valve and connection is in vivo point in returning
The disc spring for being installed in go back to flange both sides is not provided with.
Further, the front end of the guiding valve is provided with the input axle assembly being connected with input screw rod, the input axle assembly
Angle steering gear is connected between steering wheel.
Present invention also offers a kind of control method of semi-monolithic formula hydraulic booster multi-axle steering system, including above-mentioned half
Integral hydraulic power-assisted multi-axle steering system, steering wheel drive the first propons by described semi-integral type hydraulic assistance steering device
Rotate, semi-integral type hydraulic assistance steering device drives all-hydraulic steering gear to drive back axle to rotate by the output screw.
The invention has the beneficial effects as follows：The present invention makes on the basis of existing semi-integral type hydraulic assistance steering device and changing
Enter, by increasing output screw, output screw is connected with piston thread by steel ball, during steering, semi-monolithic formula hydraulic booster turns
Cooperation to device by piston with output screw transmits power to all-hydraulic steering gear, it is ensured that propons and back axle turn simultaneously
To, it is to avoid screw rod is input in conventional art drives in piston rest all-hydraulic steering gear to rotate and rear-axle steering is caused prior to front
The problem that bridge is turned to.Simultaneously because the second steering pump is exported to oil mass and the side of the second steering actuation cylinder by all-hydraulic steering gear
It is directly proportional to the number of turns of disk, can ensures that rear-axle steering angle is turned with propons by choosing the all-hydraulic steering gear of suitable types
To the correct relation of angle.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of the semi-monolithic formula hydraulic booster multi-axle steering system in the present invention；
Fig. 2 is the structural representation that the semi-integral type hydraulic assistance steering device in the present invention is coordinated with all-hydraulic steering gear；
Fig. 3 is enlarged drawing at A in Fig. 2.
Specific embodiment
Referring to figs. 1 to Fig. 3, a kind of semi-monolithic formula hydraulic booster multi-axle steering system in the embodiment of the present invention, including side
To disk 1, and steering wheel 1 connection semi-integral type hydraulic assistance steering device 3, all-hydraulic steering gear 4, the first steering pump 51, second
Steering pump 52, fuel tank 53 and at least two steeraxles, first steering pump 51, the second steering pump 52 are connected with fuel tank 53,
The fuel tank 53 can arrange two, connect the first steering pump 51, the second steering pump 52 respectively.First propons 6 includes first turn
To servo-cylinder 61, back axle 7 includes the second steering actuation cylinder 71, and the semi-integral type hydraulic assistance steering device 3 includes mechanical steering
Device 32, and the guiding valve 31 being connected with manual steering gear 32, guiding valve 31 are turned to the first described steering actuation cylinder 61, first respectively
Pump 51 connects, and the inside the shell of the manual steering gear 32 is provided with gear piston assembly, and gear piston assembly includes and guiding valve 31
The input screw rod 321 of valve element connection, and the piston 322 with tooth bar 3221 being threadedly coupled with input screw rod 321 by steel ball, institute
The valve element for stating guiding valve 31 is fixedly sleeved outside input screw rod 321, and the engagement of the tooth bar 3221 is connected with rocker arm shaft 323, described to shake
Arm axle 323 is connected with the steering gear of the first propons 6, and the all-hydraulic steering gear 4 is helped with the second described steering respectively
Power cylinder 71, the second steering pump 52 connect, and the piston 322 is threaded with output screw 324, the mechanical steering by steel ball
The shell of device 32 is fixedly connected with lower cover 326, and the other end of the correspondence piston 322 of the output screw 324 is installed by bearing 325
On lower cover 326 and the end of output screw 324 is connected with described all-hydraulic steering gear 4, install for convenience, the bearing
325 is split type bearing.Preferably, the front end of the guiding valve 31 is provided with the input axle assembly 33 being connected with input screw rod 321,
The input screw rod 321 is connected with the input shaft 331 of input axle assembly 33 by cross axle sleeve 34, the input axle assembly 33 and
Angle steering gear 2 is connected between steering wheel 1, steering wheel 1 changes driving angle by angle steering gear 2, facilitates semi-monolithic formula hydraulic pressure
The space arrangement of power-assisted steering device 3 and all-hydraulic steering gear 4.
For location and installation lower cover 326, and the lubricating oil in manual steering gear 32 is prevented from lower cover 326 and manual steering gear
Reveal at the link position of 32 shells, the first positioning that the lower cover 326 is provided with the inside the shell of insertion manual steering gear 32 is cylindrical
3261, it is close first be socketed in the first positioning cylindrical 3261 to be provided between the first positioning cylindrical 3261 and the outer casing inner wall
Seal 91, first positioning cylindrical 3261 are provided with the groove of socket sealing ring.Output screw 324 is installed for convenience, it is described
The end of lower cover 326 is provided with for compressing the plug screw 327 of bearing 325, and the middle part of plug screw 327 is provided with is easy to output screw 324
The via for passing through, is provided with the oil sealing 92 being socketed on output screw 324, institute between the plug screw 327 and output screw 324
State and between plug screw 327 and lower cover 326, be provided with the second sealing ring 93 being socketed on plug screw 327.Second sealing ring 93, oil
Envelope 92 prevents gap of the lubricating oil in manual steering gear 32 between lower cover 326 and plug screw 327, output screw 324 respectively
With the gap leakage between plug screw 327.
In the present embodiment, connector 8 is installed between the all-hydraulic steering gear 4 and lower cover 326, the connector 8
Rear and front end is respectively equipped with the prelocalization cavity 81 and rear located cavity 82 being connected, and the lower cover 326 is provided with recessed with prelocalization
The second positioning cylindrical 3262 that chamber 81 coordinates, the all-hydraulic steering gear 4 are provided with the positioning boss coordinated with rear located cavity 82
41.The connecting portion that the connector 8 is avoided between output screw 324 and all-hydraulic steering gear 4 exposes, protection mechanism, and
And the cooperation of the cooperation, rear located cavity 82 and positioning boss 41 of prelocalization cavity 81 and the second positioning cylindrical 3262, under convenience
Lid 326 and 4 location and installation of all-hydraulic steering gear, improve installation effectiveness.Preferably, the output screw 324 and hydro-steering
, by spline connection, inserting is convenient, and centering is good for device 4.In order that structure more steps up to knit, while avoid installing interfering, the company
Junctor 8 is connected with all-hydraulic steering gear 4 by hexagon socket head cap screw, and 8 periphery of connector is provided with mounting flange 83, and mounting flange 83 leads to
Cross outer-hexagonal bolt to be connected with lower cover 326.When said structure is installed, the positioning boss 41 of all-hydraulic steering gear 4 is inserted into connection
In the rear located cavity 82 of body 8, then both are connected with hexagon socket head cap screw, are then positioned the second of lower cover 326 again
In the prelocalization cavity 81 of cylindrical 3262 insertion connector 8, both are fixed with outer-hexagonal bolt, you can complete to install.
Further, return to neutral mechanism is housed between the guiding valve 31 and manual steering gear 32, the return to neutral mechanism includes connection
Time middle connector 301 of guiding valve 31 and manual steering gear 32, and time flange 302 on input screw rod 321, the guiding valve
31 are respectively equipped with the disc spring 303 for being installed in go back to 302 both sides of flange with returning in middle connector 301.The structure is made using disc spring 303
For original paper in returning so that during the present invention is returned, performance is good, turns to more stable.
When the present invention is turned to, input screw rod 321 is driven to rotate by angle steering gear 2 by steering wheel 1, due to the road of deflecting roller
Face frictional resistance, the movement of piston 322 are obstructed and maintain static, and input 321 opposing pistons 322 of screw rod are moved axially, and compress disc spring
303, and then the movement of the valve element with movable pulley 31, guiding valve 31 opens, and hydraulic oil is assigned to by the first steering pump 51 by guiding valve 31
First steering actuation cylinder 61, promotes the first propons 6 to start to turn to, and now, the moving resistance of piston 322 reduces, and piston 322 is defeated
Moving under the driving for entering screw rod 321, and drive rocker arm shaft 323 to rotate promotes the first propons 6 to turn to, while piston 322 is moved
Output screw 324 is driven to rotate, output screw 324 drives the valve core rotation of all-hydraulic steering gear 4, and the second steering pump 52 is by complete
The hydraulic oil of the output certainty ratio of hydraulic steering gear 4 is to the second steering actuation cylinder 71 promoting back axle 7 to rotate.The structure due to it is complete
Hydraulic steering gear 4 connection output screw 324 be connected with piston 322, output screw 324 be input into screw rod 321 disconnect, when and only
Output screw 324 could be driven to rotate when piston 322 is moved, thus propons and back axle 7 be can ensure that while turning to, it is to avoid pass
Screw rod 321 is input in system technology drives all-hydraulic steering gear 4 to rotate and cause back axle 7 to turn to prior to front when piston 322 is static
The problem that bridge is turned to.
The embodiment of the present invention additionally provides a kind of control method of semi-monolithic formula hydraulic booster multi-axle steering system, including upper
The semi-monolithic formula hydraulic booster multi-axle steering system stated, steering wheel 1 are driven by described semi-integral type hydraulic assistance steering device 3
First propons 6 is rotated, and semi-integral type hydraulic assistance steering device 3 drives all-hydraulic steering gear 4 to drive by the output screw 324
Back axle 7 is rotated.The control method of the semi-monolithic formula hydraulic booster multi-axle steering system of the present invention is completed by mechanical transmission, right
Than in electric-control method, not affected by external environment condition such as temperature etc., and be not in the problems such as electronic device is aging, the scope of application
Extensively, reliability is high.Power is transmitted in cooperation of the semi-integral type hydraulic assistance steering device 3 by piston 322 with output screw 324 simultaneously
To all-hydraulic steering gear 4, it is ensured that propons and back axle 7 are turned to simultaneously, and as the second steering pump 52 passes through all-hydraulic turn
Export to device 4 and be directly proportional to the number of turns of steering wheel 1 to the oil mass of the second steering actuation cylinder 71, by the full liquid for choosing suitable types
Pressure steering gear 4 can ensure the correct relation of 7 steering angle of back axle and front axle steering angle.
Certainly, it is of the invention in addition to above-mentioned embodiment, the deformation that can also have in other structures, these equivalent technologies
Scheme is should also be as within its protection domain.
Claims (8)
1. a kind of semi-monolithic formula hydraulic booster multi-axle steering system, including steering wheel (1), and the semi-monolithic that connects of steering wheel (1)
Formula hydraulic power steering gear (3), all-hydraulic steering gear (4), the first steering pump (51), the second steering pump (52), fuel tank (53) and
At least two steeraxles, the first propons (6) include the first steering actuation cylinder (61), and back axle (7) is including the second steering actuation cylinder
(71), the semi-integral type hydraulic assistance steering device (3) is including manual steering gear (32), and be connected with manual steering gear (32)
Guiding valve (31), guiding valve (31) are connected with described the first steering actuation cylinder (61), the first steering pump (51) respectively, and the machinery turns
Gear piston assembly is provided with to the inside the shell of device (32), gear piston assembly includes the input spiral shell being connected with the valve element of guiding valve (31)
Bar (321), and the piston (322) of the band tooth bar (3221) being threadedly coupled with input screw rod (321) by steel ball, the tooth bar
(3221) engagement is connected with rocker arm shaft (323), the all-hydraulic steering gear (4) respectively with the second described steering actuation cylinder
(71), the second steering pump (52) connection, it is characterised in that：The piston (322) is threaded with output screw by steel ball
(324), the shell of the manual steering gear (32) is fixedly connected with lower cover (326), and the output screw (324) does not install piston
(322) one end is by bearing (325) is on lower cover (326) and the end of output screw (324) is all-hydraulic with described
Steering gear (4) connects.
2. a kind of semi-monolithic formula hydraulic booster multi-axle steering system according to claim 1, it is characterised in that：The lower cover
(326) be provided with insertion manual steering gear (32) inside the shell first positioning cylindrical (3261), first position cylindrical (3261) with
The first sealing ring (91) being socketed in the first positioning cylindrical (3261) is provided between the outer casing inner wall.
3. a kind of semi-monolithic formula hydraulic booster multi-axle steering system according to claim 1, it is characterised in that：The lower cover
(326) end is provided with for compressing the plug screw (327) of bearing (325), is provided with and is easy to output screw in the middle part of plug screw (327)
(324) via for passing through, is provided between the plug screw (327) and output screw (324) and is socketed on output screw (324)
Oil sealing (92), is provided with the second sealing ring (93) being socketed on plug screw (327) between the plug screw (327) and lower cover (326).
4. a kind of semi-monolithic formula hydraulic booster multi-axle steering system according to claim 1, it is characterised in that：The full liquid
Connector (8) is installed between pressure steering gear (4) and lower cover (326), the rear and front end of the connector (8) is respectively equipped with connected
Logical prelocalization cavity (81) and rear located cavity (82), the lower cover (326) are provided with coordinated with prelocalization cavity (81)
Two position cylindrical (3262), and the all-hydraulic steering gear (4) is provided with the positioning boss (41) coordinated with rear located cavity (82).
5. a kind of semi-monolithic formula hydraulic booster multi-axle steering system according to claim 4, it is characterised in that：The connection
Body (8) is connected with all-hydraulic steering gear (4) by hexagon socket head cap screw, and connector (8) periphery is provided with mounting flange (83), is installed convex
Edge (83) is connected with lower cover (326) by outer-hexagonal bolt.
6. a kind of semi-monolithic formula hydraulic booster multi-axle steering system according to claim 1, it is characterised in that：The guiding valve
(31) equipped with return to neutral mechanism and manual steering gear (32) between, the return to neutral mechanism includes connecting guiding valve (31) and manual steering gear
(32) connector (301) in return, and return flange (302) in input screw rod (321), the guiding valve (31) and time in
The disc spring (303) for being installed in go back to flange (302) both sides is respectively equipped with connector (301).
7. a kind of semi-monolithic formula hydraulic booster multi-axle steering system according to claim 1, it is characterised in that：The guiding valve
(31) front end is provided with the input axle assembly (33) being connected with input screw rod (321), input axle assembly (33) and direction
Angle steering gear (2) is connected between disk (1).
8. a kind of control method of semi-monolithic formula hydraulic booster multi-axle steering system, it is characterised in that：Including claim 1～7
Arbitrary described semi-monolithic formula hydraulic booster multi-axle steering system, steering wheel (1) are turned by described semi-monolithic formula hydraulic booster
The first propons (6) is driven to rotate to device (3), semi-integral type hydraulic assistance steering device (3) is driven by the output screw (324)
All-hydraulic steering gear (4) drives back axle (7) to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410758320.3A CN104709344B (en) | 2014-11-28 | 2014-11-28 | Semi-integral type hydraulic power-assisted multi-axle steering system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410758320.3A CN104709344B (en) | 2014-11-28 | 2014-11-28 | Semi-integral type hydraulic power-assisted multi-axle steering system and control method thereof |
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| Publication Number | Publication Date |
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| CN104709344A CN104709344A (en) | 2015-06-17 |
| CN104709344B true CN104709344B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410758320.3A Active CN104709344B (en) | 2014-11-28 | 2014-11-28 | Semi-integral type hydraulic power-assisted multi-axle steering system and control method thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107140014A (en) * | 2017-05-22 | 2017-09-08 | 安徽江淮汽车集团股份有限公司 | A kind of double-front axle automobile steering system |
| CN108482485A (en) * | 2018-05-31 | 2018-09-04 | 南通环球转向器制造有限公司 | The all-hydraulic rear axle independent steering device of cylinder type and its operation principle |
| CN111301518B (en) * | 2019-12-10 | 2021-10-15 | 东风越野车有限公司 | Rear axle electro-hydraulic power steering system and control method thereof |
| CN112208631A (en) * | 2020-10-22 | 2021-01-12 | 北京航天发射技术研究所 | Electro-hydraulic steering system with double oil sources |
| CN113147885B (en) * | 2021-05-07 | 2022-08-05 | 徐州重型机械有限公司 | Double-loop semi-integral steering gear, steering power-assisted system and crane |
| CN114275033B (en) * | 2022-02-15 | 2023-04-14 | 一汽解放汽车有限公司 | Steering system and vehicle |
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| DE3902808A1 (en) * | 1988-02-04 | 1989-08-17 | Zahnradfabrik Friedrichshafen | Hydraulic power steering system |
| US5971093A (en) * | 1996-03-14 | 1999-10-26 | Kayaba Industry Co., Ltd. | Power steering device |
| CN201390284Y (en) * | 2009-03-31 | 2010-01-27 | 江门市兴江转向器有限公司 | Semi-integral type hydraulic assistance steering device |
| CN103171620A (en) * | 2011-12-21 | 2013-06-26 | 北京市三一重机有限公司 | Multi-axle steering system and multi-axle steering vehicle |
| CN203427872U (en) * | 2013-08-30 | 2014-02-12 | 徐州重型机械有限公司 | Wheeled crane and steering hydraulic control system thereof |
| CN204250156U (en) * | 2014-11-28 | 2015-04-08 | 江门市兴江转向器有限公司 | A kind of semi-monolithic formula hydraulic booster multi-axle steering system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110037619A (en) * | 2009-10-07 | 2011-04-13 | 현대자동차주식회사 | Power steering with stopper |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3902808A1 (en) * | 1988-02-04 | 1989-08-17 | Zahnradfabrik Friedrichshafen | Hydraulic power steering system |
| US5971093A (en) * | 1996-03-14 | 1999-10-26 | Kayaba Industry Co., Ltd. | Power steering device |
| CN201390284Y (en) * | 2009-03-31 | 2010-01-27 | 江门市兴江转向器有限公司 | Semi-integral type hydraulic assistance steering device |
| CN103171620A (en) * | 2011-12-21 | 2013-06-26 | 北京市三一重机有限公司 | Multi-axle steering system and multi-axle steering vehicle |
| CN203427872U (en) * | 2013-08-30 | 2014-02-12 | 徐州重型机械有限公司 | Wheeled crane and steering hydraulic control system thereof |
| CN204250156U (en) * | 2014-11-28 | 2015-04-08 | 江门市兴江转向器有限公司 | A kind of semi-monolithic formula hydraulic booster multi-axle steering system |
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| Publication number | Publication date |
|---|---|
| CN104709344A (en) | 2015-06-17 |
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