CN102001436B - Closed exhaust rotary vane type steering gear - Google Patents
Closed exhaust rotary vane type steering gear Download PDFInfo
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- CN102001436B CN102001436B CN 201010552048 CN201010552048A CN102001436B CN 102001436 B CN102001436 B CN 102001436B CN 201010552048 CN201010552048 CN 201010552048 CN 201010552048 A CN201010552048 A CN 201010552048A CN 102001436 B CN102001436 B CN 102001436B
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Abstract
The invention relates to a closed exhaust rotary vane type steering gear. The steering gear comprises a steering gear box and a rotor inside the steering gear box, wherein the two ends of the rotor are contacted with the steering gear box through a sealing strip and a hydraulic cavity respectively; the top of the rotor is provided with an upper sealing ring, an upper bush and an end cover; the bottom of the rotor is provided with a lower sealing ring and a lower bush; an oil drainage pipeline is arranged at a position on the side part of the rotor and close to the hydraulic cavity; one end of the oil drainage pipeline is communicated with an annular groove between the rotor and the end cover, and the other end of the oil drainage pipeline is contacted with a friction plate between the rotor and the steering gear box; the annular groove is communicated with the hydraulic cavity through an air outlet pipeline, a closed exhaust module and an air inlet pipeline in turn; and the closed exhaust module is connected with the end cover through a plate. Due to the design of the steering gear, waste of hydraulic oil is avoided, environmental pollution is prevented, the steering gear has relatively small size and relatively high safety, is easy to install and maintain and can lubricate the friction plate and the lower bush while exhausting, and the mechanical efficiency of the rotary vane type steering gear can be improved.
Description
Technical field
The present invention relates to a kind of rotary vane type steering gear, relate in particular to a kind of rotary vane type steering gear of closed exhaust, specifically be applicable to the built-in discharging of gas, hydraulic oil in the hydraulic cavities on the rotary vane type steering gear.
Background technology
Steering gear is the visual plant that guarantees marine operation safety, and it is used to keep or change the course of boats and ships.Rotary vane type steering gear is a kind of novel steering gear, its principle of work is similar to vane motor, it is mechanical energy with hydraulic energy transfer, last output is the rotation of rotor, and rotor is connected by key or other modes with rudder stock, the rotation of rotor drives the rotation of rudder stock, thereby has realized the steering process.Rotary vane type steering gear is little, lightweight with its volume, the occupation of land space is little, it is succinct, easy to maintenance to install, the advantages such as mechanical efficiency is high, consuming little energy are favored by the user deeply.
Rotary vane type steering gear mainly is comprised of loof mechanism, Hydraulic Pump group and piping.If the air of sneaking in the steering gear hydraulic system can not in time be discharged, will make steering gear hydraulic system produce the harm such as vibration, noise, oil temperature rising and steering shakiness, therefore, steering gear hydraulic system is carried out exhaust be very important.
Because the particularity of structure, the rotary vane type steering gear of the domestic and international overwhelming majority has all adopted the exhaust mode of open type at present, namely at the top of end cap 3 blow off valve 16 is installed.Referring to figure 1 – Fig. 2, Fig. 1 is the cutaway view of aforementioned prior art, as seen from the figure, the rotary vane type steering gear of open exhaust comprises steering wheel casing 1 and the inner rotor 2 that arranges thereof, one end of rotor 2 contacts with steering wheel casing 1 by sealing band 4, be formed with hydraulic cavities 5 between the other end and the steering wheel casing 1, the top of rotor 2 is provided with end cap 3, end cap 3 is captiveed joint with the upper end of steering wheel casing 1 by bolt of cover 31, be provided with lower seal 6 between the bottom of the lower end of steering wheel casing 1 and rotor 2, be provided with seal ring 7 between the top of rotor 2 and the end cap 3, the position of nearly upper seal ring 7 is set with lining 8 on the top of rotor 2, the position of nearly lower seal 6 is set with lower lining 9 on the bottom of rotor 2, the position of nearly hydraulic cavities 5 is provided with draining pipeline 10 on the sidepiece of rotor 2, one end of draining pipeline 10 be arranged at rotor 2, circular groove 11 between the end cap 3 communicates, the other end be arranged at rotor 2, friction lining 12 between the steering wheel casing 1 contacts, be provided with existing gas exhaust duct 17 in the end cap 3, one end of existing gas exhaust duct 17 communicates with hydraulic cavities 5, and the other end communicates with blow off valve 16 on being arranged on end cap 3.Fig. 2 is the birds-eye view of aforementioned prior art, and as seen from the figure, the quantity of blow off valve 16 is six, and equal correspondence is provided with a blow off valve 16 on each hydraulic cavities 5.During use, by opening blow off valve 16 gas in the hydraulic cavities 5, hydraulic oil are discharged, but when exhaust, the hydraulic oil of discharging with air is not directly to return hydraulic efficiency pressure system, but flows directly to outside the system, has so both polluted surrounding environment, cause again the waste of hydraulic oil, and be absolutely unsafe.
At present, also there is the rotary vane type steering gear of only a few to be designed to the closed exhaust system, but its mode is that blow off valve is installed at the end cap top, the blow off valve other end links to each other with fuel tank by oil pipe, because each blow off valve all needs to be equipped with an oil pipe in this mode, not only I﹠M difficulty, increased the work capacity of installing in the ship, and volume more greatly, attractive in appearance.
Summary of the invention
The objective of the invention is to overcome the I﹠M that exists in the prior art large, the waste hydraulic oil of difficulty, volume, contaminated environment, lower defective and the problem of safety, provide that a kind of I﹠M is simple, small volume, do not waste the rotary vane type steering gear of hydraulic oil, the closed exhaust that free from environmental pollution, safety is higher.
For realizing above purpose, technical solution of the present invention is: a kind of rotary vane type steering gear of closed exhaust, comprise steering wheel casing and the inner rotor that arranges thereof, one end of described rotor contacts with the steering wheel casing by sealing band, be formed with hydraulic cavities between the other end and the steering wheel casing, the top of rotor is provided with end cap, end cap is captiveed joint with the upper end of steering wheel casing by bolt of cover, be provided with lower seal between the lower end of steering wheel casing and the bottom of rotor, be provided with seal ring between the top of rotor and the end cap, the position of nearly upper seal ring is set with lining on the top of rotor, the position of nearly lower seal is set with lower lining on the bottom of rotor, the position of nearly hydraulic cavities is provided with the draining pipeline on the sidepiece of rotor, one end of draining pipeline be arranged at rotor, circular groove between the end cap communicates, the other end be arranged at rotor, friction lining between the steering wheel casing contacts;
The inside of described end cap is provided with induction tract, one end of induction tract communicates with hydraulic cavities, the other end communicates with the admission port of closed exhaust module on being arranged on end cap, the air extractor duct of closed exhaust module communicates with the vent pipe that is arranged on end cap inside, and the other end of vent pipe communicates with the draining pipeline by circular groove.
Described induction tract comprises mutually vertical induction tract connected vertically and horizontal induction tract, vertically an end of induction tract communicates with hydraulic cavities, the other end communicates with horizontal induction tract, and the other end of horizontal induction tract communicates with the admission port of closed exhaust module; Described vent pipe comprises mutually horizontal vent pipe connected vertically and vertical vent pipe, one end of horizontal vent pipe communicates with the air extractor duct of closed exhaust module, the other end communicates with vertical vent pipe, and vertically the other end of vent pipe communicates with the draining pipeline by circular groove.
Described closed exhaust module is board-like the connection with the connection mode of end cap; Described closed exhaust module comprises valve body and the inner spool that arranges thereof, be provided with the module lining between the inside of spool and valve body, the position that the inside of valve body is positioned at module lining lower end is provided with air extractor duct, air extractor duct communicates with admission port by air channel, the inside of air channel contacts with the tip of spool, and the position of extending valve body on the tail end of spool is provided with handwheel.
Described valve body is captiveed joint with end cap by the valve body screw.
Compared with prior art, beneficial effect of the present invention is:
1, owing to being provided with induction tract in the inside of end cap in the rotary vane type steering gear of a kind of closed exhaust of the present invention, one end of induction tract communicates with hydraulic cavities, the other end communicates with the admission port of closed exhaust module on being arranged on end cap, the air extractor duct of closed exhaust module communicates with the vent pipe that is arranged on end cap inside, the other end of vent pipe communicates with the draining pipeline by circular groove, therefore when carrying out exhaust, gas and hydraulic oil pass through induction tract successively, the closed exhaust module, vent pipe, circular groove and draining pipeline are directly got back to fuel tank, thereby recovery hydraulic oil, rather than it is discharged in the external environment condition pollutes.Therefore the present invention not only can not waste hydraulic oil, and does not pollute the environment.
2, because the inside that the induction tract in the rotary vane type steering gear of a kind of closed exhaust of the present invention and vent pipe all are arranged on end cap, realized the internalization of oil and gas pipes, and the oil pipe that does not need as prior art the outer setting at the steering wheel casing to have draining to use, not only reduced the difficulty of I﹠M, and reduced integrally-built volume, be convenient to install, in addition, because induction tract, what arrange between the vent pipe is the closed exhaust module, be board-like the connection between this closed exhaust module and the end cap, therefore do not need when mounted extra installation measure, only need to get final product by the connection of valve body screw, I﹠M is very convenient.Therefore the present invention's small volume not only, and I﹠M is simpler.
3, because what the closed exhaust module in the rotary vane type steering gear of a kind of closed exhaust of the present invention rose when exhaust is a function served as bridge, it is poppe tvalve core by the handwheel rotation, thereby vacate air channel, be communicated with admission port and air extractor duct by air channel again, and then conducting induction tract and vent pipe, then gas and the hydraulic oil in the hydraulic cavities passes through induction tract successively, admission port, air extractor duct, vent pipe and circular groove are to enter the draining pipeline, this shows, the realization of whole process is entirely in the inside of steering wheel, and do not need as prior art, to open blow off valve with gas, hydraulic oil is discharged the outside of steering wheel, easy contaminated environment not only, and when the pressure in the hydraulic cavities is higher, also easily personnel are on every side damaged, have certain potential safety hazard, and the present invention because carrying out in the inside of steering wheel entirely, whole process has then avoided this possibility well, when carrying out exhaust, operate very safe.Therefore safety of the present invention is higher.
4, the order of flowing through owing to hydraulic pressure intracavity gas, hydraulic oil in the rotary vane type steering gear of a kind of closed exhaust of the present invention is followed successively by induction tract, closed exhaust module, vent pipe, circular groove, draining pipeline and fuel tank, and the bottom of draining pipeline be arranged at the friction lining between rotor, the steering wheel casing, lower lining contacts, therefore when hydraulic oil flows to this position, can be lubricated friction lining, lower lining, reduce the friction force between rotor and lower lining, the friction lining, improve the mechanical efficiency of rotary vane type steering gear.Therefore the present invention can be in exhaust lubricating friction plate and lower lining, thereby the mechanical efficiency of raising rotary vane type steering gear.
Description of drawings
Fig. 1 is the cutaway view of prior art.
Fig. 2 is the birds-eye view of prior art.
Fig. 3 is the structural representation of closed exhaust module among the present invention.
Fig. 4 is the structural representation of valve body among Fig. 3.
Fig. 5 is birds-eye view of the present invention.
Among the figure: steering wheel casing 1, rotor 2, end cap 3, bolt of cover 31, sealing band 4, hydraulic cavities 5, lower seal 6, upper seal ring 7, upper lining 8, lower lining 9, draining pipeline 10, circular groove 11, friction lining 12, induction tract 13, vertically induction tract 131, horizontal induction tract 132, closed exhaust module 14, valve body screw 140, admission port 141, air extractor duct 142, valve body 143, spool 144, module lining 145, air channel 146, handwheel 147, tip 148, tail end 149, vent pipe 15, horizontal vent pipe 151, vertically vent pipe 152, blow off valve 16, existing gas exhaust duct 17, stator 18.
The specific embodiment
The present invention is further detailed explanation below in conjunction with description of drawings and the specific embodiment
Referring to figure 3 – Fig. 5, a kind of rotary vane type steering gear of closed exhaust, comprise steering wheel casing 1 and the inner rotor 2 that arranges thereof, one end of described rotor 2 contacts with steering wheel casing 1 by sealing band 4, be formed with hydraulic cavities 5 between the other end and the steering wheel casing 1, the top of rotor 2 is provided with end cap 3, end cap 3 is captiveed joint with the upper end of steering wheel casing 1 by bolt of cover 31, be provided with lower seal 6 between the bottom of the lower end of steering wheel casing 1 and rotor 2, be provided with seal ring 7 between the top of rotor 2 and the end cap 3, the position of nearly upper seal ring 7 is set with lining 8 on the top of rotor 2, the position of nearly lower seal 6 is set with lower lining 9 on the bottom of rotor 2, the position of nearly hydraulic cavities 5 is provided with draining pipeline 10 on the sidepiece of rotor 2, one end of draining pipeline 10 be arranged at rotor 2, circular groove 11 between the end cap 3 communicates, the other end be arranged at rotor 2, friction lining 12 between the steering wheel casing 1 contacts;
The inside of described end cap 3 is provided with induction tract 13, one end of induction tract 13 communicates with hydraulic cavities 5, the other end communicates with the admission port 141 of closed exhaust module 14 on being arranged on end cap 3, the air extractor duct 142 of closed exhaust module 14 communicates with the vent pipe 15 that is arranged on end cap 3 inside, and the other end of vent pipe 15 communicates with draining pipeline 10 by circular groove 11.
Described induction tract 13 comprises mutually vertical induction tract 131 connected vertically and horizontal induction tract 132, vertically an end of induction tract 131 communicates with hydraulic cavities 5, the other end communicates with horizontal induction tract 132, and the other end of horizontal induction tract 132 communicates with the admission port 141 of closed exhaust module 14; Described vent pipe 15 comprises mutually horizontal vent pipe 151 connected vertically and vertical vent pipe 152, one end of horizontal vent pipe 151 communicates with the air extractor duct 142 of closed exhaust module 14, the other end communicates with vertical vent pipe 152, and vertically the other end of vent pipe 152 communicates with draining pipeline 10 by circular groove 11.
Described closed exhaust module 14 is board-like the connection with the connection mode of end cap 3; Described closed exhaust module 14 comprises valve body 143 and the inner spool 144 that arranges thereof, be provided with module lining 145 between the inside of spool 144 and valve body 143, the position that the inside of valve body 143 is positioned at module lining 145 lower ends is provided with air extractor duct 142, air extractor duct 142 communicates with admission port 141 by air channel 146, the inside of air channel 146 contacts with the tip 148 of spool 144, and the position of extending valve body 143 on the tail end 149 of spool 144 is provided with handwheel 147.
Described valve body 143 is captiveed joint with end cap 3 by valve body screw 140.
Referring to Fig. 5, Fig. 5 is birds-eye view of the present invention (this birds-eye view is the birds-eye view that removes behind the end cap 3), and as seen from the figure, rotary vane type steering gear is mainly become by steering wheel casing 1, rotor 2 and stator 18, end cap 3, sealing member and other enclosure group; Three rotating vanes are arranged on the rotor 2, with 2 one-tenth integral structures of rotor, rotor blade becomes 120 ° evenly to distribute, three stators 18 are fixedly mounted in the steering wheel casing 1, equally also being into 120 ° evenly distributes, like this, the inner chamber of steering wheel casing 1 is divided into six little hydraulic cavities 5 by three rotating vanes of three stators 18 and rotor 2, these six hydraulic cavities 5 are divided into two groups, and the interval arranges each other, and in the use, one group is high pressure chest, another group is with regard to oil return, uses in turn to realize suitable, the switching that conter clockwise turns to of rotor 2.Because the gas in the hydraulic efficiency pressure system is in the top of system, therefore need to be to each hydraulic cavities 5 respectively exhaust, because the particularity of rotary vane type steering gear structure, what mostly adopt at present is the open exhaust mode, as shown in Figure 2, this mode is directly at the end cap 3 of rotary vane type steering gear blow off valve 16 to be installed, this blow off valve 16 is the screw thread installing type, mainly by bleeding plug, body and hollow bolt form, and turn on the exhaust that bleeding plug can be realized rotary vane type steering gear, but when external exhaust, hydraulic oil together flows to outside inevitably, contaminated environment, and, when the pressure in the hydraulic cavities 5 was larger, this exhaust mode was very dangerous.
The present invention is when design, fully take into account the work characteristics of rotary vane type steering gear, take full advantage of the effect of circular groove 11, and the end cap 3 of rotary vane type steering gear suitably improved design in addition, not only section is provided with induction tract 13 and vent pipe 15 within it, and is designed with subbase mounted closed exhaust module 14 thereon, makes the whole closed exhaust system integration on rotary vane type steering gear, referring to Fig. 5, the closed exhaust module 14 of a correspondence is all assembled at the top of each hydraulic cavities 5.Referring to Fig. 4, closed exhaust module 14 mainly is comprised of valve body 143, spool 144, module lining 145, handwheel 147 and sealing member.
In the use, when the hydraulic cavities 5 in the rotary vane type steering gear is carried out exhaust, rotate first the handwheel 147 of setting on the tail end 149 with poppe tvalve core 144 and most advanced and sophisticated 148, thereby vacate air channel 146, be communicated with admission port 141 and air extractor duct 142 by the air channel 146 of vacating again, and then conducting induction tract 13 and vent pipe 15, subsequently, gas in the hydraulic cavities 5 and hydraulic oil are successively by induction tract 13, admission port 141, air extractor duct 142, vent pipe 15, circular groove 11 and draining pipeline 10 are to enter Hydraulic Pump group fuel tank, whole process is carried out in steering wheel casing 1 and the inside of end cap 3 entirely, do not need to arrange external device, such as oil pipe etc., overall volume is less, be convenient to I﹠M, simultaneously, can not waste hydraulic oil, do not pollute the environment yet, safety is also higher, in addition, since the bottom of draining pipeline 10 again be arranged at rotor 2, friction lining 12 between the steering wheel casing 1 contacts, and the downside of friction lining 12 is provided with again the lower lining 9 that communicates with it, therefore when hydraulic oil flows to this position, can be to friction lining 12, lower lining 9 is lubricated, thereby reduces rotor 2 and lower lining 9, friction force between the friction lining 12, the mechanical efficiency of raising rotary vane type steering gear.
Therefore the present invention not only can not waste hydraulic oil and contaminated environment, small volume, I﹠M is simpler, and safety is higher, can be in exhaust lubricating friction plate and lower lining, can improve the mechanical efficiency of rotary vane type steering gear.
Claims (4)
1. the rotary vane type steering gear of a closed exhaust, comprise steering wheel casing (1) and the inner rotor (2) that arranges thereof, one end of described rotor (2) contacts with steering wheel casing (1) by sealing band (4), be formed with hydraulic cavities (5) between the other end and the steering wheel casing (1), the top of rotor (2) is provided with end cap (3), end cap (3) is captiveed joint with the upper end of steering wheel casing (1) by bolt of cover (31), be provided with lower seal (6) between the bottom of the lower end of steering wheel casing (1) and rotor (2), be provided with seal ring (7) between the top of rotor (2) and the end cap (3), the position of nearly upper seal ring (7) is set with lining (8) on the top of rotor (2), the position of nearly lower seal (6) is set with lower lining (9) on the bottom of rotor (2), the position of nearly hydraulic cavities (5) is provided with draining pipeline (10) on the sidepiece of rotor (2), one end of draining pipeline (10) be arranged at rotor (2), circular groove (11) between the end cap (3) communicates, the other end be arranged at rotor (2), friction lining (12) between the steering wheel casing (1) contacts, and it is characterized in that:
The inside of described end cap (3) is provided with induction tract (13), one end of induction tract (13) communicates with hydraulic cavities (5), the other end communicates with the admission port (141) of closed exhaust module (14) on being arranged on end cap (3), the air extractor duct (142) of closed exhaust module (14) vent pipe (15) inner with being arranged on end cap (3) communicates, and the other end of vent pipe (15) communicates with draining pipeline (10) by circular groove (11).
2. the rotary vane type steering gear of a kind of closed exhaust according to claim 1, it is characterized in that: described induction tract (13) comprises mutually vertical induction tract connected vertically (131) and horizontal induction tract (132), vertically an end of induction tract (131) communicates with hydraulic cavities (5), the other end communicates with horizontal induction tract (132), and the other end of horizontal induction tract (132) communicates with the admission port (141) of closed exhaust module (14); Described vent pipe (15) comprises mutually horizontal vent pipe connected vertically (151) and vertical vent pipe (152), one end of horizontal vent pipe (151) communicates with the air extractor duct (142) of closed exhaust module (14), the other end communicates with vertical vent pipe (152), and vertically the other end of vent pipe (152) communicates with draining pipeline (10) by circular groove (11).
3. the rotary vane type steering gear of a kind of closed exhaust according to claim 1 and 2, it is characterized in that: described closed exhaust module (14) is board-like the connection with the connection mode of end cap (3); Described closed exhaust module (14) comprises valve body (143) and the inner spool (144) that arranges thereof, be provided with module lining (145) between the inside of spool (144) and valve body (143), the position that the inside of valve body (143) is positioned at module lining (145) lower end is provided with air extractor duct (142), air extractor duct (142) communicates with admission port (141) by air channel (146), the inside of air channel (146) contacts with the tip (148) of spool (144), and the position of extending valve body (143) on the tail end (149) of spool (144) is provided with handwheel (147).
4. the rotary vane type steering gear of a kind of closed exhaust according to claim 3 is characterized in that: described valve body (143) is captiveed joint with end cap (3) by valve body screw (140).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010552048 CN102001436B (en) | 2010-11-22 | 2010-11-22 | Closed exhaust rotary vane type steering gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010552048 CN102001436B (en) | 2010-11-22 | 2010-11-22 | Closed exhaust rotary vane type steering gear |
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| Publication Number | Publication Date |
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| CN102001436A CN102001436A (en) | 2011-04-06 |
| CN102001436B true CN102001436B (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010552048 Active CN102001436B (en) | 2010-11-22 | 2010-11-22 | Closed exhaust rotary vane type steering gear |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442157B (en) * | 2016-12-07 | 2018-11-27 | 贵州黎阳航空动力有限公司 | A kind of experimental rig of Subarea detecting casing hydraulic pressure strength |
| CN106989175B (en) * | 2017-05-17 | 2020-01-10 | 南京工业职业技术学院 | Rotating vane type steering engine movable vane integrated sealing device |
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| JP3926253B2 (en) * | 2002-11-21 | 2007-06-06 | ジャパン・ハムワージ株式会社 | Valve block structure of rotary vane type steering machine |
| CN201045346Y (en) * | 2005-04-08 | 2008-04-09 | 松下电器产业株式会社 | Enclosed rotary compressor |
| CN101158365A (en) * | 2007-11-13 | 2008-04-09 | 辽宁鑫宇装备自动化有限公司 | Direct driving type volume servo control power installation |
| CN101434291A (en) * | 2008-12-16 | 2009-05-20 | 薛伟功 | Rotary vane type high pressure steering engine |
| JP2009162290A (en) * | 2008-01-07 | 2009-07-23 | Japan Hamuwaaji Kk | Sealing structure of rotary vane type helm machine and replacing method of lower ring seal |
| EP1437296A4 (en) * | 2001-09-11 | 2010-07-07 | Japan Hamworthy & Co Ltd | Sealing structure for rotary vane type steerer |
| JP4514617B2 (en) * | 2005-02-03 | 2010-07-28 | ジャパン・ハムワージ株式会社 | Seal structure in rotary vane type steering machine |
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2010
- 2010-11-22 CN CN 201010552048 patent/CN102001436B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1437296A4 (en) * | 2001-09-11 | 2010-07-07 | Japan Hamworthy & Co Ltd | Sealing structure for rotary vane type steerer |
| JP3926253B2 (en) * | 2002-11-21 | 2007-06-06 | ジャパン・ハムワージ株式会社 | Valve block structure of rotary vane type steering machine |
| JP4514617B2 (en) * | 2005-02-03 | 2010-07-28 | ジャパン・ハムワージ株式会社 | Seal structure in rotary vane type steering machine |
| CN201045346Y (en) * | 2005-04-08 | 2008-04-09 | 松下电器产业株式会社 | Enclosed rotary compressor |
| CN101158365A (en) * | 2007-11-13 | 2008-04-09 | 辽宁鑫宇装备自动化有限公司 | Direct driving type volume servo control power installation |
| JP2009162290A (en) * | 2008-01-07 | 2009-07-23 | Japan Hamuwaaji Kk | Sealing structure of rotary vane type helm machine and replacing method of lower ring seal |
| CN101434291A (en) * | 2008-12-16 | 2009-05-20 | 薛伟功 | Rotary vane type high pressure steering engine |
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