CN103935396A - Recirculating ball power steering gear valve element, screw rod assembly with valve element and light hand-power steering gear with valve element - Google Patents
Recirculating ball power steering gear valve element, screw rod assembly with valve element and light hand-power steering gear with valve element Download PDFInfo
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- CN103935396A CN103935396A CN201410156091.8A CN201410156091A CN103935396A CN 103935396 A CN103935396 A CN 103935396A CN 201410156091 A CN201410156091 A CN 201410156091A CN 103935396 A CN103935396 A CN 103935396A
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Abstract
The invention provides a recirculating ball power steering gear valve element, a screw rod assembly with the valve element and a light hand-power steering gear with the valve element. The shape of a cut of a valve element oil groove cutting edge is a spline curve composed of a plurality of points. A large-diameter penetrating structure screw rod is adopted for the screw rod assembly, and rotating limitation of the valve element and the screw rod is achieved through a limiting pin. Compared with the prior art, input hand power of a driver for a steering wheel is relieved through the light hand-power steering gear, frictional resistance is reduced, the manipulation is gentle and smooth, steering adhesion and blocking do not exist, and the road feel is clear. While the stability of linear driving is guaranteed, hydraulic assisting power can intervene rapidly within a common steering angle, and thus the manipulating force can be effectively relieved. The light hand-power steering gear has very good popularization and application value.
Description
Technical field
The present invention relates to steering box production technical field, specifically a kind of ball-and-nut power steering machine spool, the screw rod assembly that contains this spool and light hand-power steering box and light hand-power.
Background technology
The circulating ball type hydraulic power-assisted steering machine of at present widespread use is mainly by housing, ball circuit screw nut assembly, and a few macrostructure parts compositions of sector shaft, wherein the control of hydraulic booster mainly realizes by the steering control valve being integrated in screw rod assembly.The form of steering control valve is mainly side valve type and steering valve.Wherein side valve type is because complex structure is progressively eliminated, and steering valve, because of its compact conformation, is controlled highly sensitive and is used widely.Frotteurism between the scantling of structure of rotary valve related components and geometric parameter and each relative motion parts, determine the hand force property of steering box, be valve characteristic curve, its sign be the relation between chaufeur bearing circle input torque and steering box hydraulic booster size and output torque.Therefore the quality of valve characteristic curve can directly feed back in the operating experience of chaufeur, and the difference of hand force property can cause the road feel difference of chaufeur obvious.
Growing along with the load carrying ability in commercial vehicle/comm..vehicle field, the load of steeraxle progressively strengthens, and chaufeur can become heavy to the manipulation of bearing circle thereupon.Although can improve output torque by the boost pressure that improves steering swivel system, system pressure has only determined the peak torque of steering box, and the control feel of chaufeur is not directly improved.For alleviating steering box hand-power, main by adjusting the edge geometrical shape of spool in rotary valve, reduction torsion bar rigidity, the three kinds of approach of friction drag that reduce steering box inside realize.In prior art, design calculation for edge geometrical shape is partial to theoretical analysis, if edge geometrical shape design is complicated, conventional grinding technique is difficult to ensure the accuracy of geometric configuration, therefore the basic method adopting is to adopt the circular arc of a chamfering or several different radiis to form the geometric configuration of cutting edge at present, as the shape described in patent CN94202303.X and CN201220546707.9, cause in rotation process, controlling oily flowrate variation not soft, hand-power improves DeGrain, and in build-up pressure process, there will be sudden change to cause turning to shake.And for the adjustment of torsion bar rigidity, the non-penetration type screw-rod structure of the many employings of structure of existing product, as patent, CN201320305563.2 describes, or rotary valve and screw rod employing separation type, as described in patent CN99224497.8, such total length of structure is short, causes the method that reduces rigidity by increasing torsion bar length to be difficult to realize.Only can depend merely on and reduce torsion bar diameter and alleviate hand-power, but because torsion bar diameter is too small, its strength and stability also all significantly reduces, when torsion bar corner is excessive, under ultimate limit state, torsion bar may rupture, the excessive reduction of torsion bar rigidity will affect the self-aligning performance of steering box on the other hand, while causing straight-line travelling, chaufeur perceived direction is unstable, and sensing is inaccurate etc.In addition, existing product structure is mostly by asking ear or cone tank to meet the needs of rotary valve rotating and limiting mechanism in the processing of screw rod end face, as described in patent CN200720087046.7, cause the axial location difficulty of screw rod, can only lean on a radial bearing to realize location and reduce friction, bearing bears larger axis to power, is difficult to further reduce friction drag.Therefore simple dependence reduces torsion bar diameter and alleviates steering box hand-power, cannot obtain significant effect.
Summary of the invention
Technical assignment of the present invention is to solve the deficiencies in the prior art, and a kind of ball-and-nut power steering machine spool with special edge geometrical shape is provided.
The further technical assignment of the present invention is to provide the light hand-power steering box screw rod assembly that contains above-mentioned spool;
The 3rd technical assignment of the present invention is to provide the light hand-power steering box that contains above-mentioned screw rod assembly.
Technical scheme of the present invention realizes in the following manner, a kind of ball-and-nut power steering machine spool, comprise cylindric spool body, spool body outer wall has some oil grooves, the length direction of oil groove is axial consistent with spool body, be characterized in that oil groove cutting edge notch geometry is the SPL being made up of multiple points, polar coordinate system (ρ can be passed through in the position of each point, α) define, α angle refers on SPL some angle that the straight line that connects into the spool cylindrical center of circle forms with the symmetrical center line of spool oil groove, for the polar angle in polar coordinate system, ρ is the distance that a little arrives polar coordinates center, it is utmost point footpath, for intuitively reflecting the ebb interval of crossing of the corresponding each point of spool cutting edge, conventionally utmost point footpath ρ is changed into by point and representing to the distance A of spool cylindrical.Oil pressure force value corresponding to a certain specific overcurrent gap width is certain, and valve characteristic curve is a continuous curve, determine its good be not certain flashy pressure, but whether the uphill process of pressure smooth-going.And ensure that level and smooth, submissive, the pulsation-free key of valve characteristic curve shape is, and valve pocket and spool relatively rotate in process, and the ebb interval of crossing of spool cutting edge changes rationally, and transition is soft.Applicant obtains one group of desirable (A, α) value by a large amount of calculating, experiment, and valve pocket and spool are relatively rotated in process, the ebb interval of crossing of spool cutting edge changes rationally, and transition is soft, is guaranteeing hydraulic booster intervention rapidly, when reducing hand-power, make valve characteristic curve smooth-going soft
The value of α and A as shown above.
For the further smooth-going mildness of poppet valve characteristic curve,
α and A be value shown in upper table preferably.
Above-mentioned spool can be six slot type spools, can be also eight slot type spools.Remove other technical characterictic outside cutting edge notch geometry all identical with six slot types of the prior art or eight slot type spools, as long as the width of groove and length and aperture match, can coordinate with the valve pocket (endoporus has oil groove) in any known technology and form rotary valve; Form ball-and-nut power steering machine screw rod assembly with screw rod (endoporus has oil groove) and torsion bar.
In order to reach better technique effect, the preferred following structure of above-mentioned ball-and-nut power steering machine screw rod assembly: described screw rod axle center is provided with penetration type through hole, spool base portion and torsion bar are all arranged in through hole, one end that spool does not insert screw vent is provided with spline, one end that spool inserts screw vent fixes by pin and torsion bar one end, the torsion bar other end is fixedly connected with by being pressed into pin away from one end of spool with screw rod, spool and screw rod are realized rotary spacing by locating dowel pin, locating dowel pin through the spacing hole of spool and with screw rod flush fit.
In order further to reduce friction drag, can between spool external diameter and screw rod endoporus, radial needle bearing be set, two radial needle bearings are arranged at respectively the both sides of oil groove.
Screw rod external diameter is not less than 39mm.
Applicant is through experiment confirmation, and above-mentioned screw rod assembly is applied to when steering box is produced can obtain all good hand force property curve, can effectively alleviate actuating force.Here the basic structure of said steering box is identical with the basic structure of steering box in prior art, mainly by housing, case lid, screw rod assembly, rack piston and profile of tooth fan axle assembly form, screw rod assembly, rack piston and profile of tooth fan axle assembly are all arranged in the space of housing and case lid formation, screw rod assembly is horizontally set on housing top, screw rod in screw rod assembly coordinates with rack piston inner hole thread, the tooth bar of rack piston bottom coordinates with the sector male thread of the profile of tooth fan axle assembly that is arranged on lower housing portion, be characterized in that described screw rod assembly is above-mentioned ball-and-nut power steering machine screw rod assembly.
In order to reduce the friction drag of bolt rotary, packing ring and axial thrust needle bearing can be set respectively between screw rod and housing and case lid.
The beneficial effect that the present invention compared with prior art produced is:
Compared with having technology, light hand-power steering box of the present invention has significantly alleviated the input hand-power of chaufeur bearing circle, has reduced friction drag, handles soft smooth-goingly, and what the larger friction drag of having no way of caused turns to viscous, hair fastener phenomenon, and road feel is clear.In stability in the time ensureing straight-line travelling, when conventional steering angle, hydraulic booster is got involved rapidly, thereby effectively alleviates actuating force.Specifically:
(1) provide a kind of new edge geometrical shape, the SPL being formed by multiple points, the determining positions of each some the open area of valve under corresponding steering angle.The edge geometrical shape of this feature can realize that in the time of little steering angle, to ensure that open area guarantees that in the time that straight-line travelling or low-angle turn to power steering increases excessively gently mild, avoids turning to unstable.And within the scope of conventional steering angle, increase open area, make oil pressure Rapid Establishment to produce power-assisted, and then alleviate bearing circle mechanical control hand-power, to reducing the key role of hand-power.
(2) by screw design be major diameter penetration type structure.Screw rod endoporus is in providing control liquid oil circuit, also torsion bar can extend to the end of screw rod, for the increase of torsion bar length provides sufficient space, thereby avoided existing structure to reduce torsion bar rigidity by reducing the mode of torsion bar diameter, in ensureing parts reliability, can reduce hand-power.
(3) by changing rotary valve rotary position limiting structure form (spool and screw rod are realized rotary spacing by locating dowel pin), without carrying out rotary spacing at end face processing holder ear, allow penetration type screw rod can adopt two end axles to locate mode, and significantly reduce the friction drag of bolt rotary by two end face needle roller thrust bearings.And larger external diameter can be placed more circulating steel balls, in reducing each steel ball contact stress, further reduce friction drag.Thereby avoid carrying out positioning screw by a radial ball bearing, caused friction drag to increase because additional axial force is applied on bearing.
(4) spool need to coordinate enough closely to realize the sealing function to controlling liquid with screw rod endoporus, two radial needle bearings are set between spool external diameter and screw rod endoporus, can reduce the friction drag that spool and screw rod endoporus produce because closely cooperating, reduce steering box hand-power.
Brief description of the drawings
Accompanying drawing 1 is the light hand-power ball-and-nut power steering of the present invention machine structural representation;
Accompanying drawing 2 is F-F section drawings of steering box in Fig. 1;
Accompanying drawing 3 is the enlarged views in the B of steering box shown in Fig. 2 region;
Accompanying drawing 4 is valve core structure figure in Fig. 1;
Accompanying drawing 5 is D-D cross sections of spool in Fig. 4;
Accompanying drawing 6 is the enlarged views in spool cross section in Fig. 5;
Accompanying drawing 7 is the enlarged views in X region in Fig. 6;
Accompanying drawing 8 is C-C section drawings of steering box in Fig. 1;
Accompanying drawing 9 is steering box hand force property curve comparison figure of the present invention.
In figure, 1. housing, 2. rack piston, 3. pin, 4. seal ring, 5. locating dowel pin, 6. screw rod, 7. radial needle bearing, 8. spool (input shaft), 9. sealing, 10. packing ring, 11. axial thrust needle bearings, 12. sector axles, 13. circulating steel balls, 14. axial thrust needle bearings, 15. torsion bars, 16. packing rings, 17. seal rings, 18. O type circles, 19. bolts, 20. case lid, 21. seal rings, 22. are pressed into pin, 23. splines, 24. oil grooves, 25. spool oil groove symmetrical center line, 26. spool cylindrical kernel of sections and sample curve point connection lead, 27. high pressure oil feed grooves, 28. back leakage grooves.
Detailed description of the invention
Below in conjunction with accompanying drawing, a kind of ball-and-nut power steering machine spool of the present invention, the screw rod assembly that contains this spool and light hand-power steering box are described in detail below.
As shown in accompanying drawing 1,2,3,8, light hand-power steering box is mainly made up of housing 1, case lid 20, screw rod assembly, rack piston 2 and profile of tooth fan axle assembly.
Case lid 20 is secured by bolts in housing 1 open end, and screw rod assembly, rack piston 2 and profile of tooth fan axle assembly are all arranged in the space that housing 1 and case lid 20 form.
The structure of rack piston 2, profile of tooth fan axle assembly is identical with the structure of prior art steering box middle rack piston and profile of tooth fan axle assembly.Rack piston 2 is arranged on housing 1 top, and with housing 1 bearing fit.Rack piston 2 is processed with through hole, fabrication cycles steel ball 13 raceway used in hole, and screw rod 6 screws in and passes rack piston 2 endoporus.Rack piston 2 lower gear rack and sector axle 12 screws thread fit of profile of tooth fan axle assembly that are arranged on lower housing portion.
Screw rod assembly is made up of spool 8, screw rod 6 and torsion bar 15.
Screw rod 6 is the large diameter version of penetration type, and axle center is provided with penetration type through hole.The external diameter of screw rod 6 is 39mm, and internal diameter is 23mm.Screw rod 6 one end are seated the endoporus of housing 1, and the other end is seated in the endoporus of case lid 20 in the same way, and two ends are respectively with pad 10,16 and axial thrust needle bearing 11,14.
Spool 8 base portions are passed housing 1 and are inserted in the through hole of screw rod 6.One end that spool 8 is positioned at outside housing 1 is processed with spline 23, for being in transmission connection by transmission shaft and bearing circle.One end that spool 8 inserts screw rod 6 through holes fixes by pin 3 and one end of torsion bar 15.The other end of torsion bar 15 is fixedly connected with by being pressed into pin 22 with screw rod 6.Spool 8 is realized rotary spacing with screw rod 6 by locating dowel pin 5, locating dowel pin 5 through the spacing hole of spool 8 and with screw rod 6 flush fits.Machinery between spool 8 and screw rod 6 coordinates the sealing function that hydraulic oil need be provided, and therefore tolerance clearance is between the two very tight.The present invention increases by two radial needle bearings 7 in the both sides of used spool 8 oil grooves 24.This needle bearing is interference fit by apolegamy in order to ensure that the external diameter of bearing 7 coordinates with the endoporus of screw rod 6, thus in guarantee poppet shaft in accurate positioning, also eliminated due to spool 8 and screw rod 6 friction drag producing that closely cooperates.
As shown in accompanying drawing 4-7, above-mentioned spool 8 is cylindrical-shaped structure.Spool 8 one end are processed with spline 23 base portions and are evenly distributed with 6 oil grooves 24, and the length direction of oil groove 24 is axial consistent with spool 8.The blade shape of spool is realized by SPL.Polar coordinate system (ρ can be passed through in the position of SPL each point, α) define, α angle refers on SPL some angle that the straight line 26 that connects into the spool cylindrical center of circle forms with the symmetrical center line 25 of spool oil groove, for the polar angle in polar coordinate system, ρ is the distance that a little arrives polar coordinates center, be utmost point footpath, for directly reflecting the ebb interval of crossing of the corresponding each point of spool cutting edge, utmost point footpath ρ changed into and represents more directly perceived to the distance A of spool cylindrical by point.Accompanying drawing 5 is the actual geometric configuration of spool oil groove and cutting edge, and the α angle as shown in Figure 6 of position and the point that form the each point of this SPL decide to the distance A of spool cylindrical.Fig. 7 is the detailed geometric configuration of this cutting edge, and the distance A of corresponding each angle is respectively d1, d2, d3, di ...This, is crossed ebb interval and changes thereupon and affect the force value of hydraulic booster, thereby determined the shape of valve characteristic curve while relatively rotating angle variation between spool and valve pocket apart from the ebb interval of crossing that has characterized power-assisted oil.After spool edge geometrical shape is determined, relatively rotate the arbitrary moment in process at valve pocket and spool, crossing ebb interval is determined value, this is crossed ebb interval and can learn by geometric operation.Accordingly, when having served as ebb interval value and determining, can calculate corresponding power-assisted oil pressure value according to general fluid mechanics formula.Therefore oil pressure force value corresponding to a certain specific overcurrent gap width is certain, and valve characteristic curve is a continuous curve, determine its good be not certain flashy pressure, but whether the uphill process of pressure smooth-going.And ensure that valve characteristic curve shape level and smooth, submissive, pulsation-free key is, and valve pocket and spool relatively rotate in process, and the ebb interval of crossing of spool cutting edge changes rationally, and transition is soft, and this just needs the design optimization of the distance of each point on the SPL of cutting edge.The present invention alleviates emphatically input shaft hand-power, makes every effort to increase the force value ascending velocity in conventional steering range, and hydraulic booster is got involved sensitive, thereby alleviated actuating force,
Calculate and experiment through a large amount of, the coordinate of each point on the SPL finally drawing (21 groups) as shown above.
Coordinate figure in table is depicted as to curve, as shown in Figure 7.Shape by this curve can find out, in little rotational angle situation, crosses that ebb interval is less and transition is slow, and power-assisted rises mild, unstable while avoiding straight-line travelling.And under larger rotational angle, the increase of crossing ebb interval that is communicated with high pressure oil feed groove 27 is obvious, and the ebb interval of crossing that opposite side leads to back leakage groove 28 is simultaneously closed in time, causes boost pressure to rise rapidly, thereby hydraulic booster is provided in time, alleviates the mechanical input torque of bearing circle.In addition, for realizing the accurate control to edge geometrical shape, adopt the technology generations of extrusion forming for grinding-shaping, overhours is short and crudy stable.
Above-mentioned steering box mechanical drive realizes in the following manner, and bearing circle is connected with spool (input shaft) 8 by transmission shaft, spool spline 23.Input torque passes to screw rod 6 by spool 8, torsion bar 15.Between screw rod 6 and rack piston 2, with circulating steel ball 13 and by screw drive mode, the rotation of screw rod 6 is converted to piston 2 translations, then piston 2 is delivered to output on sector axle 12 by tooth bar by power.The control of hydraulic part mainly realizes by screw rod 6 and the rotary valve of spool 8 mix proportions.As shown in Figure 2.Due to the elastic deformation of torsion bar 15, spool 8 relatively rotates existence with screw rod 6, changes and folding the flow direction of realization to power-assisted oil and the control of pressure by the ebb interval of crossing between spool blade shape and screw rod oil groove.When the relative rotation of spool 8 and screw rod 6 is enough greatly time, the high-pressure oil passage that leads to piston 2 one sides is opened completely, low pressure oil way is closed, and the high-pressure oil passage of corresponding opposite side is closed completely, low pressure oil way is opened, and hydraulic booster reaches maxim, now hole one end in contact coaxial with it on rotary spacing pin 5 and spool 8, spool 8 is realized being rigidly connected with screw rod 6 and is together rotated, as shown in Figure 1.The cylindrical of rack piston 2 and endoporus are respectively with seal ring 21 and seal ring 4, and for closed piston both sides oil pocket, in the time that a side is communicated with high pressure oil, hydraulic oil promotes piston and moves to opposite side.
Above-mentioned ball-and-nut power steering machine torsion bar 15 used adopts relatively large diameter for ensureing intensity and the fatigue property of torsion bar, simultaneously because screw rod 6 is penetration type, for design and the layout of torsion bar 15 provide sufficient space, therefore spiro rod length obviously increases, and can find out that by formula () increase of torsion bar length can reduce torsion bar moment of torsion.
t=GI p φ/L(1)
Wherein,
t---moment of torsion;
i p ---second polar moment of area;
φ---twist angle;
g---modulus of shearing;
l---torsion bar length;
As shown in Figure 9, abscissa is input hand-power, and ordinate is hydraulic booster force value.The hand force property curve that in figure, solid line is steering box of the present invention, dotted line is a kind of existing common steering box hand force property curve.Contrast known, steering box of the present invention is mild in little rotational angle situation downforce process of establishing, ensure straight motion stability, and in conventional angle range under input hand-power more by a small margin increases hydraulic booster value rise rapidly, power-assisted successful, thus machinery input hand-power effectively reduced.
Claims (8)
1. a ball-and-nut power steering machine spool, comprise cylindric spool body, spool body outer wall has some oil grooves, the length direction of oil groove is axial consistent with spool body, it is characterized in that: oil groove cutting edge notch geometry is the SPL being made up of multiple points, the position of each point determines to the distance A of spool cylindrical by the α angle of this point and this point, and described α angle refers on SPL the angle that straight line that any and the spool cylindrical center of circle connect into forms with the symmetrical center line of spool oil groove
The value of α and A as shown above.
2. spool according to claim 1, is characterized in that:
The value of α and A as shown above.
3. ball-and-nut power steering machine screw rod assembly, is mainly made up of spool, screw rod and torsion bar, it is characterized in that described spool is spool described in claim 1 or 2.
4. screw rod assembly according to claim 3, it is characterized in that: described screw rod axle center is provided with penetration type through hole, spool base portion and torsion bar are all arranged in through hole, one end that spool does not insert screw vent is provided with spline, one end that spool inserts screw vent fixes by pin and torsion bar one end, the torsion bar other end is fixedly connected with by being pressed into pin away from one end of spool with screw rod, spool and screw rod are realized rotary spacing by locating dowel pin, locating dowel pin through the spacing hole of spool and with screw rod flush fit.
5. screw rod assembly according to claim 4, is characterized in that: between spool external diameter and screw rod endoporus, be provided with radial needle bearing, two radial needle bearings are arranged at respectively the both sides of oil groove.
6. according to the screw rod assembly described in claim 4 or 5, it is characterized in that: screw rod external diameter is not less than 39mm.
7. light hand-power steering box, mainly formed by housing, case lid, screw rod assembly, rack piston and profile of tooth fan axle assembly, screw rod assembly, rack piston and profile of tooth fan axle assembly are all arranged in the space of housing and case lid formation, screw rod assembly is horizontally set on housing top, screw rod in screw rod assembly coordinates with rack piston inner hole thread, the tooth bar of rack piston bottom coordinates with the sector male thread of the profile of tooth fan axle assembly that is arranged on lower housing portion, it is characterized in that described screw rod assembly is screw rod assembly described in claim 2.
8. steering box according to claim 7, is characterized in that being provided with between screw rod and housing and case lid packing ring and axial thrust needle bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410156091.8A CN103935396B (en) | 2014-04-18 | 2014-04-18 | A kind of ball-and-nut power steering machine spool, screw rod assembly containing this spool and light hand-power steering box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410156091.8A CN103935396B (en) | 2014-04-18 | 2014-04-18 | A kind of ball-and-nut power steering machine spool, screw rod assembly containing this spool and light hand-power steering box |
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| Publication Number | Publication Date |
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| CN103935396A true CN103935396A (en) | 2014-07-23 |
| CN103935396B CN103935396B (en) | 2016-02-17 |
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| US5322142A (en) * | 1990-08-24 | 1994-06-21 | Zf Friedrichshafen, Ag. | Hydraulic auxiliary power steering |
| CN2294198Y (en) * | 1996-08-16 | 1998-10-14 | 毕大宁 | Power-driven steering mechanism for automobile |
| US6170599B1 (en) * | 1997-11-25 | 2001-01-09 | Toyota Jidosha Kabushiki Kaisha | Power steering apparatus |
| CN201080204Y (en) * | 2007-09-20 | 2008-07-02 | 东风汽车有限公司 | Integral hydraulic control rotary valve of power steering gear |
| CN202641834U (en) * | 2012-05-21 | 2013-01-02 | 浙江新越汽车零部件有限公司 | Low noise rotary valve of automobile fluid-link steering device |
| CN203439108U (en) * | 2013-08-27 | 2014-02-19 | 上海格尔汽车附件有限公司 | Automobile steering device valve element |
| CN203819329U (en) * | 2014-04-18 | 2014-09-10 | 采埃孚商用车转向机（山东）有限公司 | Valve core for steering machine, screw assembly provided with the valve core, and light hand power steering machine |
-
2014
- 2014-04-18 CN CN201410156091.8A patent/CN103935396B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5322142A (en) * | 1990-08-24 | 1994-06-21 | Zf Friedrichshafen, Ag. | Hydraulic auxiliary power steering |
| CN2294198Y (en) * | 1996-08-16 | 1998-10-14 | 毕大宁 | Power-driven steering mechanism for automobile |
| US6170599B1 (en) * | 1997-11-25 | 2001-01-09 | Toyota Jidosha Kabushiki Kaisha | Power steering apparatus |
| CN201080204Y (en) * | 2007-09-20 | 2008-07-02 | 东风汽车有限公司 | Integral hydraulic control rotary valve of power steering gear |
| CN202641834U (en) * | 2012-05-21 | 2013-01-02 | 浙江新越汽车零部件有限公司 | Low noise rotary valve of automobile fluid-link steering device |
| CN203439108U (en) * | 2013-08-27 | 2014-02-19 | 上海格尔汽车附件有限公司 | Automobile steering device valve element |
| CN203819329U (en) * | 2014-04-18 | 2014-09-10 | 采埃孚商用车转向机（山东）有限公司 | Valve core for steering machine, screw assembly provided with the valve core, and light hand power steering machine |
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Address after: Lingang Development Zone Airport Yaoqiang Town Road Licheng District 250107 in Shandong city of Ji'nan province No. 4647 Applicant after: Dr. automotive steering systems (Ji'nan) Co., Ltd. Address before: Lingang Development Zone Airport Yaoqiang Town Road Licheng District 250107 in Shandong city of Ji'nan province No. 4647 Applicant before: ZF commercial vehicle steering (Shandong) Co., Ltd. |
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