CN104443019A - Low-noise hydraulic steering gear - Google Patents
Low-noise hydraulic steering gear Download PDFInfo
- Publication number
- CN104443019A CN104443019A CN201410791052.5A CN201410791052A CN104443019A CN 104443019 A CN104443019 A CN 104443019A CN 201410791052 A CN201410791052 A CN 201410791052A CN 104443019 A CN104443019 A CN 104443019A
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- Prior art keywords
- valve pocket
- spool
- oil
- oil return
- valve
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Classifications
-
- 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
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
- B62D5/083—Rotary valves
- B62D5/0837—Rotary valves characterised by the shape of the control edges, e.g. to reduce noise
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention relates to a low-noise hydraulic steering gear, and belongs to the field of hydraulic technologies. The steering gear is provided with a valve body oil inlet ring groove, a valve sleeve and a valve core, valve sleeve oil return holes are formed in one end of the valve sleeve, valve sleeve oil distributing holes are formed in the middle section of the valve sleeve, and valve sleeve oil inlet holes are formed between the valve sleeve oil return holes and the valve sleeve oil distributing holes; a set of valve core oil return holes which correspond to the valve sleeve oil return holes in position and are distributed at intervals in the circumferential direction is formed in one end of the valve core, an oil distributing ring groove is formed in the position, corresponding to the valve sleeve oil inlet holes, of the valve core, and the oil distributing groove extends at intervals in the circumferential direction to form a set of communicating grooves corresponding to the valve sleeve oil distributing holes in position; buffering grooves are manufactured in the positions corresponding to at least one set of the valve sleeve oil return holes and the valve core oil return holes, and the axial extending length of the buffering grooves is larger than the circulating length of the oil return holes. Closure or communication of the oil return holes will become gentle due to the gradual transition of the intermediate state, the flow rate and the pressure of hydraulic oil change gently, and consequently noise is reduced effectively.
Description
Technical field
The present invention relates to a kind of deflector, especially a kind of low noise hydraulic steering gear, belongs to technical field of hydraulic pressure.
Background technology
Hydraulic steering gear is a kind of steering controlling device generally applied on construction machinery and equipment, field machine and other engineering trucks, primarily of turning the parts compositions such as stator Meshing Pair, valve body, valve core housing assembly.Wherein, valve core housing assembly is made up of spool and valve pocket, and spool is arranged on valve pocket inside.Further understanding deflector concrete structure and principle of work can be the Chinese patent literature of 200810020802.3 see application number, the deflector valve body one end that the document discloses supports indexable spool, also have valve pocket between spool and valve body, valve body, valve pocket and spool form rotary valve; The other end is equipped with at the cycloidal pinion engaged pair between dish and bonnet; The inner chamber of valve body installs the indexable spool being shaped with runner by valve pocket; In spool, universal driving shaft is housed; One end of universal driving shaft forms the rotary valve flow distributing structure coordinated with valve flowing channel; The other end of universal driving shaft forms cycloid measure motor by spline tooth wheel set and cycloidal pinion engaged pair; Runner on valve body is communicated with into and out of hydraulic fluid port with inner chamber transfer valve flow-distribution mechanism runner.
According to the applicant understood, in prior art deflector turn to switching controls noise very large.Inside due to deflector relates to the complex mechanism such as cycloidal pin wheel set, interlock transmission, and runner also seems very numerous and diverse, and the possible cause producing noise is more.Therefore for a long time, the problems referred to above fail effectively to solve always, become one technical barrier, have impact on the quality of deflector.
Summary of the invention
The object of the invention is to: for above-mentioned prior art Problems existing, by structural development, propose a kind of hydraulic steering gear of low noise.
In order to achieve the above object, applicant, through deep study and analysis and validation trial, finds finally, and dominant noise source during deflector manipulation is from the fuel return hole on spool and valve pocket.In existing deflector, spool one end is provided with spool fuel return hole, and valve pocket one end is provided with valve pocket fuel return hole corresponding with it.During deflector work, spool is communicated with as required with the fuel return hole of valve pocket by relatively rotating of spool and valve pocket or turns off the runner switching controls needed for realization.In the process, connection or the shutoff of fuel return hole complete substantially instantaneously, and oil return aperture is less, therefore becomes hydraulic oil flow velocity and pressure most important cause jumpy when switching, and result unavoidably causes noise.
On this understanding basis, the technical scheme of following low noise hydraulic steering gear of the present invention is proposed: comprise valve body, there is in the valve opening of described valve body valve body oil-feed annular groove and valve pocket is housed and is inserted into the indexable spool in described valve pocket, one end of described valve pocket has one group of circumference corresponding with described valve body oil-feed annular groove one side position radial valve pocket fuel return hole spaced apart, the stage casing of described valve pocket has one group of circumference be communicated with described valve body oil supply gallery radial valve pocket distributor port spaced apart, there is between described valve pocket fuel return hole and valve pocket distributor port the radial valve pocket fuel feed hole that one group of circumference corresponding with described valve body oil-feed annular groove opposite side position is spaced apart, described spool one end has spool fuel return hole corresponding to one group of circumference valve pocket fuel return hole position spaced apart and described, the corresponding valve pocket fuel feed hole position of described spool has distribution oil ring groove, and the one group connectivity slot corresponding with described valve pocket distributor port position is extended at described distribution oil ring groove circumference interval, it is characterized in that: one group at least described valve pocket fuel return hole and described spool fuel return hole is shaped with to organizing each fuel return hole place the dashpot that axial extension is greater than fuel return hole circulation length each.
The present invention further improves, and one of at least described dashpot both sides extend to form the Buffer Pool that width is greater than fuel return hole circulation width.
It should be noted that, " hole " implication in fuel return hole described in the application is the connectivity structure that can flow through fluid, and cross sectional shape is not defined as circle.
During work, primary importance: when rotary spool makes spool fuel return hole and valve pocket fuel return hole angular position stagger, be in scram position, connectivity slot on spool is communicated with the valve pocket fuel feed hole on valve pocket, the fluid that now valve body oil feed groove enters flow to spool distributing groove by each fuel feed hole on valve pocket, again after each connectivity slot by each valve pocket distributor port corresponding with it, export supply steering cylinder, the course changing control needed for realization; The second place: when rotary spool makes spool fuel return hole align with valve pocket fuel return hole angular position, be in and be communicated with position, connectivity slot on spool is separated with the valve pocket distributor port on valve pocket, the fluid that now valve body oil feed groove enters flow in spool by each fuel return hole on valve pocket and each spool fuel return hole corresponding with it, flows back to fuel tank by back leakage groove.
Unlike the prior art, in the first and second position handoff procedures, no longer directly aim at connection instantaneously between fuel return hole, and before aligning is communicated with, first be communicated with by Buffer Pool and/or dashpot transition, therefore the closedown of fuel return hole or connection can become mild because of the transition gradually of intermediateness, thus make the flow velocity of hydraulic oil and pressure change comparatively soft, result effectively reduces noise.
As can be seen here, the present invention, owing to have found the very crux of noise, therefore adopts the simple structure process that technique easily realizes, namely effectively reaches object.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention one.
Fig. 2 is the valve core structure schematic diagram of the embodiment of the present invention one.
Fig. 3 is the C-C cross section structure schematic diagram of Fig. 2.
Fig. 4 is the housing configuration schematic diagram of the embodiment of the present invention two.
Fig. 5 is the B-B cross section structure schematic diagram of Fig. 4.
Fig. 6 is the housing configuration schematic diagram of the embodiment of the present invention one.
Fig. 6 ' is the valve pocket local expansion schematic diagram corresponding with Fig. 6.
Fig. 7 is the valve core structure schematic diagram of the embodiment of the present invention one.
Fig. 7 ' is the spool local expansion schematic diagram corresponding with Fig. 7.
Fig. 8 is valve pocket, the spool relative closed positions expansion schematic diagram of the embodiment of the present invention one.
The valve pocket that Fig. 8 ' is the embodiment of the present invention one, spool are relatively communicated with position and launch schematic diagram.
Fig. 9 is the housing configuration schematic diagram of the embodiment of the present invention two.
Fig. 9 ' is the valve pocket local expansion schematic diagram corresponding with Fig. 9.
Figure 10 is the valve core structure schematic diagram of the embodiment of the present invention two.
Figure 10 ' is the spool local expansion schematic diagram corresponding with Figure 10.
Figure 11 is valve pocket, the spool relative closed positions expansion schematic diagram of the embodiment of the present invention two.
The valve pocket that Figure 11 ' is the embodiment of the present invention two, spool are relatively communicated with position and launch schematic diagram.
Detailed description of the invention
Embodiment one
As shown in Figure 1, its basic structure is same as the prior art for the low noise hydraulic steering gear of the present embodiment, and valve body right-hand member is equipped with at the cycloidal pinion engaged pair 6 between dish 4 and bonnet 5.The endoporus of valve body 1 is had valve body oil-feed annular groove 9 and is installed the indexable spool 3 being shaped with runner by valve pocket 2, or in other words, the indexable spool 3 valve pocket 2 being housed in the valve opening of valve body 1 and being inserted in valve pocket.Universal driving shaft 7 is housed in spool 3, and one end of this universal driving shaft 7 is connected with valve pocket 2 and spool 3 transmission respectively by finger 8 and elastic component, forms the rotary valve flow distributing mechanism coordinated with valve body 1 runner.The other end of universal driving shaft 7 is connected with cycloidal pinion engaged pair 6 transmission by spline tooth wheel set, forms cycloid measure motor.Valve body 1 has can with inner chamber transfer valve flow-distribution mechanism flow passage into and out of hydraulic fluid port.
The valve pocket 2 of the present embodiment is see Fig. 6 and Fig. 6 ', substantially identical with prior art, one end have one group of circumference corresponding with valve body oil-feed annular groove 9 right positions of valve body in Fig. 11 spaced apart two arrange each 12 radial valve pocket path oil return circular hole 2-1, the stage casing of valve pocket 2 has one group 12 circumferences be communicated with valve body 1 oil supply gallery radial valve pocket distributor port 2-2 spaced apart.There is between the path oil return circular hole 2-1 of valve pocket 2 and valve pocket distributor port 2-2 the radial valve pocket fuel feed hole 2-3 that one group 12 circumferences corresponding with valve body oil-feed annular groove 9 leftward position are spaced apart.
Spool 3 is as shown in Figure 2 and Figure 3 and see Fig. 7 and Fig. 7 ', one end has one group of circumference ten two spool oil return slotted eye 3-1 corresponding with valve pocket 2 oil return circular hole 2-1 position spaced apart, and each spool oil return slotted eye 3-1 place is shaped with the dashpot 3-A that axial extension L is greater than spool oil return slotted eye 3-1 circulation length l.In these dashpots 3-A, be separated by four both sides of 90 ° of angle extend, and result forms the Buffer Pool 3-A ' that width W is greater than spool oil return slotted eye circulation width w.The position of spool 3 corresponding valve pocket 2 fuel feed hole 2-3 has distribution oil ring groove 3-3, and the one group connectivity slot 3-2 corresponding with valve pocket distributor port 2-2 position is extended at distribution oil ring groove 3-3 circumference interval.
In working process, when rotary valve flow distributing mechanism is in primary importance by Movement transmit, as shown in Figure 8, spool 3 makes spool oil return slotted eye 3-1 and valve pocket 2 fuel return hole 2-1 angular position stagger, be in scram position, connectivity slot 3-2 on spool 3 is communicated with the valve pocket distributor port 2-2 on valve pocket 2, the fluid that now valve body 1 oil feed groove 9 enters flow to spool distributing groove 3-3 by each fuel feed hole 2-3 on valve pocket 2, again after each connectivity slot 3-2 by each valve pocket distributor port 2-2 corresponding with it, export supply steering cylinder, the course changing control needed for realization.When at the second position, as shown in Figure 9, spool 3 makes spool oil return slotted eye 3-1 align with valve pocket fuel return hole 2-1 angular position, be in and be communicated with position, connectivity slot 3-2 on spool 3 separates with the valve pocket distributor port 2-2 on valve pocket 2, the fluid that now valve body 1 oil feed groove 9 enters flow in spool 2 by each fuel return hole 2-1 on valve pocket 2 and each spool oil return slotted eye 3-1 corresponding with it, flows back to fuel tank by back leakage groove 3-4.
In the first and second position handoff procedures, valve pocket fuel return hole 2-1 is first communicated with the Buffer Pool 3-A ' on spool 3, be communicated with spool oil return slotted eye 3-1 through dashpot transition again, thus make to be communicated with and become mild because there is the transition gradually of intermediate connection state, the flow velocity of hydraulic oil and pressure are changed significantly and ease up, and therefore effectively reduce noise.
Embodiment two
The low noise hydraulic steering gear basic structure of the present embodiment is identical with embodiment one.Difference is the concrete structure of its valve pocket 2 and spool 3.
The valve pocket 2 of the present embodiment as shown in Figure 4 and Figure 5, see Fig. 9, Fig. 9 ', one end have one group of circumference corresponding with valve body oil-feed annular groove 9 right positions of valve body in Fig. 11 spaced apart two arrange 12 to radial valve pocket oil return slotted eye 2-1.Each valve pocket oil return slotted eye 2-1 is made up of the line of rabbet joint 2-1-2 justified at the bottom of counterbore 2-1-1 and circle counterbore.Each collar extension to circle counterbore 2-1-1 is shaped with storing of circular arc bottom and flows pond 2-1-3.The line of rabbet joint 2-1-2 place of valve pocket oil return slotted eye 2-1 is shaped with axial extension L and is greater than two valve pocket oil return slotted eye 2-1 and circulates the circular arc bottom dashpot 2-A of length l sums.
The stage casing of valve pocket 2 has one group 12 circumferences be communicated with valve body 1 oil supply gallery radial valve pocket distributor port 2-2 spaced apart.There is between the oil return slotted eye 2-1 of valve pocket 2 and valve pocket distributor port 2-2 the radial valve pocket fuel feed hole 2-3 that one group 12 circumferences corresponding with valve body oil-feed annular groove 9 leftward position are spaced apart.
The structure of spool 3 is as Figure 10, Figure 10 ' shown in, one end has one group of circumference ten two spool oil return slotted eye 3-1 corresponding with valve pocket 2 oil return round slot bore 2-1 position spaced apart, and each spool oil return slotted eye 3-1 place is shaped with the circular arc bottom dashpot 3-A that axial extension L is greater than spool oil return slotted eye 3-1 circulation length l.These dashpots 3-A extends towards both sides, and result forms the Buffer Pool 3-A ' that width W is greater than spool oil return slotted eye 3-1 circulation width w.The position of spool 3 corresponding valve pocket 2 fuel feed hole 2-3 has distribution oil ring groove 3-3, and the one group connectivity slot 3-2 corresponding with valve pocket distributor port 2-2 position is extended at distribution oil ring groove 3-3 circumference interval.
In working process, when rotary valve flow distributing mechanism is in primary importance by Movement transmit, as shown in figure 11, spool 3 makes spool oil return slotted eye 3-1 and valve pocket 2 oil return slotted eye 2-1 angular position stagger, be in scram position, connectivity slot 3-2 on spool 3 is communicated with the valve pocket distributor port 2-2 on valve pocket 2, the fluid that now valve body 1 oil feed groove 9 enters flow to spool distributing groove 3-3 by each fuel feed hole 2-3 on valve pocket 2, again after each connectivity slot 3-2 by each valve pocket distributor port 2-2 corresponding with it, export supply steering cylinder, the course changing control needed for realization.When at the second position, as shown in Figure 11 ', spool 3 makes spool oil return slotted eye 3-1 align with valve pocket oil return slotted eye 2-1 angular position, be in and be communicated with position, connectivity slot 3-2 on spool 3 separates with the valve pocket distributor port 2-2 on valve pocket 2, the fluid that now valve body 1 oil feed groove 9 enters flow in spool 2 by each fuel return hole 2-1 on valve pocket 2 and each spool oil return slotted eye 3-1 corresponding with it, flows back to fuel tank by back leakage groove 3-4.
In the first and second position handoff procedures, valve pocket oil return slotted eye 2-1 is first communicated with the Buffer Pool 3-A ' on spool 3, be communicated with spool oil return slotted eye 3-1 through dashpot transition again, thus make to be communicated with and become milder because there is the transition gradually of intermediate connection state, the flow velocity of hydraulic oil and pressure are changed significantly and ease up, test proves, the connection switching construction of this " slotted eye is to slotted eye " and embodiment one " circular hole is to slotted eye " be communicated with switching construction noise-reducing better effects if some.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (10)
1. a low noise hydraulic steering gear, comprise valve body, there is in the valve opening of described valve body valve body oil-feed annular groove and valve pocket is housed and is inserted into the indexable spool in described valve pocket, one end of described valve pocket has one group of circumference corresponding with described valve body oil-feed annular groove one side position radial valve pocket fuel return hole spaced apart, the stage casing of described valve pocket has one group of circumference be communicated with described valve body oil supply gallery radial valve pocket distributor port spaced apart, there is between described valve pocket fuel return hole and valve pocket distributor port the radial valve pocket fuel feed hole that one group of circumference corresponding with described valve body oil-feed annular groove opposite side position is spaced apart, described spool one end has spool fuel return hole corresponding to one group of circumference valve pocket fuel return hole position spaced apart and described, the corresponding valve pocket fuel feed hole position of described spool has distribution oil ring groove, and the one group connectivity slot corresponding with described valve pocket distributor port position is extended at described distribution oil ring groove circumference interval, it is characterized in that: one group at least described valve pocket fuel return hole and described spool fuel return hole is shaped with to organizing each fuel return hole place the dashpot that axial extension is greater than fuel return hole circulation length each.
2. low noise hydraulic steering gear according to claim 1, is characterized in that: one of at least described dashpot both sides extend to form the Buffer Pool that width is greater than fuel return hole circulation width.
3. low noise hydraulic steering gear according to claim 1, is characterized in that: described valve pocket one end have one group of circumference corresponding with valve body oil-feed annular groove right positions spaced apart two arrange radial valve pocket oil return circular hole; Described spool one end has one group of circumference spool oil return slotted eye corresponding with valve pocket oil return circular hole position spaced apart, and described spool oil return slotted eye place is shaped with the dashpot that axial extension is greater than spool oil return slotted eye circulation length.
4. low noise hydraulic steering gear according to claim 3, is characterized in that: in described dashpot, be separated by four both sides of 90 ° of angle extend, and form the Buffer Pool that width is greater than described spool oil return slotted eye circulation width.
5. low noise hydraulic steering gear according to claim 1, it is characterized in that: described valve pocket one end have one group of circumference corresponding with the valve body oil-feed annular groove right positions of valve body spaced apart two arrange radial valve pocket oil return slotted eye, described valve pocket oil return slotted eye is made up of the line of rabbet joint justified at the bottom of counterbore and circle counterbore.
6. low noise hydraulic steering gear according to claim 5, is characterized in that: often pair of round counterbore collar extension in described two row's circle counterbores is shaped with storing of circular arc bottom and flows pond.
7. low noise hydraulic steering gear according to claim 6, is characterized in that: the line of rabbet joint place of described valve pocket oil return slotted eye is shaped with the circular arc bottom dashpot that axial extension is greater than two circulation length sums of often pair of valve pocket oil return slotted eye.
8. low noise hydraulic steering gear according to claim 7, it is characterized in that: described spool one end has spool oil return slotted eye corresponding to one group of circumference valve pocket oil return round slot bore position spaced apart and described, and described spool oil return slotted eye place is shaped with the circular arc bottom dashpot that axial extension is greater than described spool oil return slotted eye circulation length.
9. low noise hydraulic steering gear according to claim 8, is characterized in that: described dashpot extends to form the Buffer Pool that width is greater than described spool oil return slotted eye circulation width towards both sides.
10. according to the arbitrary described low noise hydraulic steering gear of claim 1 to 9, it is characterized in that: described valve body right-hand member is equipped with at the cycloidal pinion engaged pair between dish and bonnet; In described spool, universal driving shaft is housed, one end of described universal driving shaft is connected with valve pocket and spool transmission respectively by finger and elastic component, forms the rotary valve flow distributing mechanism coordinated with valve flowing channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410791052.5A CN104443019A (en) | 2014-12-19 | 2014-12-19 | Low-noise hydraulic steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410791052.5A CN104443019A (en) | 2014-12-19 | 2014-12-19 | Low-noise hydraulic steering gear |
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| Publication Number | Publication Date |
|---|---|
| CN104443019A true CN104443019A (en) | 2015-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410791052.5A Pending CN104443019A (en) | 2014-12-19 | 2014-12-19 | Low-noise hydraulic steering gear |
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| Country | Link |
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| CN (1) | CN104443019A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106697045A (en) * | 2015-11-16 | 2017-05-24 | 镇江液压股份有限公司 | Multiple-damping-buffer noise-reduction type low-noise steering gear |
| CN107084168A (en) * | 2017-05-27 | 2017-08-22 | 江苏德生新材料锻造有限公司 | A kind of hydraulic reversing valve |
| CN109109971A (en) * | 2018-09-05 | 2019-01-01 | 芜湖中意液压科技股份有限责任公司 | A kind of all-hydraulic steering gear |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4516471A (en) * | 1981-12-28 | 1985-05-14 | Ford Motor Company | Power steering valve with chamfered lands |
| US4730544A (en) * | 1986-10-16 | 1988-03-15 | Danfoss A/S | Control device for hydrostatic steering means or the like |
| CN1189134A (en) * | 1995-05-05 | 1998-07-29 | 毕晓普驾驶有限公司 | Rotary valve for power steering gear |
| CN2487629Y (en) * | 2001-07-10 | 2002-04-24 | 济宁伊顿液压有限公司 | Small displacement cycloidal full-hydraulic steering device |
| CN200971109Y (en) * | 2006-08-08 | 2007-11-07 | 上海采埃孚转向机有限公司 | Valve core of arc groove steering gear |
| 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 |
| JP2009073229A (en) * | 2007-09-19 | 2009-04-09 | Hitachi Ltd | Hydraulic control valve and power steering device |
| CN204323470U (en) * | 2014-12-19 | 2015-05-13 | 镇江液压股份有限公司 | A kind of low noise hydraulic steering gear |
-
2014
- 2014-12-19 CN CN201410791052.5A patent/CN104443019A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4516471A (en) * | 1981-12-28 | 1985-05-14 | Ford Motor Company | Power steering valve with chamfered lands |
| US4730544A (en) * | 1986-10-16 | 1988-03-15 | Danfoss A/S | Control device for hydrostatic steering means or the like |
| CN1189134A (en) * | 1995-05-05 | 1998-07-29 | 毕晓普驾驶有限公司 | Rotary valve for power steering gear |
| CN2487629Y (en) * | 2001-07-10 | 2002-04-24 | 济宁伊顿液压有限公司 | Small displacement cycloidal full-hydraulic steering device |
| CN200971109Y (en) * | 2006-08-08 | 2007-11-07 | 上海采埃孚转向机有限公司 | Valve core of arc groove steering gear |
| JP2009073229A (en) * | 2007-09-19 | 2009-04-09 | Hitachi Ltd | Hydraulic control valve and power steering device |
| 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 |
| CN204323470U (en) * | 2014-12-19 | 2015-05-13 | 镇江液压股份有限公司 | A kind of low noise hydraulic steering gear |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106697045A (en) * | 2015-11-16 | 2017-05-24 | 镇江液压股份有限公司 | Multiple-damping-buffer noise-reduction type low-noise steering gear |
| CN107084168A (en) * | 2017-05-27 | 2017-08-22 | 江苏德生新材料锻造有限公司 | A kind of hydraulic reversing valve |
| CN109109971A (en) * | 2018-09-05 | 2019-01-01 | 芜湖中意液压科技股份有限责任公司 | A kind of all-hydraulic steering gear |
| CN109109971B (en) * | 2018-09-05 | 2021-04-02 | 芜湖中意液压科技股份有限责任公司 | Full hydraulic steering gear |
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Application publication date: 20150325 |
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