CN202867804U - Hydraulic gear shifting pressure control valve - Google Patents

Hydraulic gear shifting pressure control valve Download PDF

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Publication number
CN202867804U
CN202867804U CN 201220588054 CN201220588054U CN202867804U CN 202867804 U CN202867804 U CN 202867804U CN 201220588054 CN201220588054 CN 201220588054 CN 201220588054 U CN201220588054 U CN 201220588054U CN 202867804 U CN202867804 U CN 202867804U
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CN
China
Prior art keywords
valve core
accumulator
oil
slide block
adjusting pressuring
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
Application number
CN 201220588054
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Chinese (zh)
Inventor
韩嘉骅
王飞
姚进
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Sichuan University
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Sichuan University
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Priority to CN 201220588054 priority Critical patent/CN202867804U/en
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Publication of CN202867804U publication Critical patent/CN202867804U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

A hydraulic gear shifting pressure control valve comprises a valve body, a pressure regulating valve core, an energy accumulator main spring, an energy accumulator vice spring, an energy accumulator plunger, a throttling opening, a pressure setting valve core spring, a pressure setting valve core and a delayed slide block. The pressure regulating valve core and the delayed slide block act with the energy accumulator plunger in a mutual mode respectively through the energy accumulator main spring and the energy accumulator vice spring. An oil inlet of the pressure regulating valve core is connected with an oil pump, and an oil outlet of the pressure regulating valve core is connected with a pressure regulating valve core pilot oil chamber, a pressure setting valve core oil inlet and a gear shifting clutch oil cylinder. The oil outlet of the pressure regulating valve core after passing through the throttling opening is connected with an energy accumulator dorsal chamber. The energy accumulator dorsal chamber is connected with an energy accumulator spring chamber through an oil hole in the pressure regulating valve core. The energy accumulator spring chamber is connected with an oil outlet of the pressure setting valve core. According to the hydraulic gear shifting pressure control valve, the delayed slide block is used for enabling the moment when the pressure regulating valve core begins to move to be delayed, so that the maximum opening degree of the oil outlet of the pressure regulating valve core can be maintained all the time in a fast oil charging stage, hydraulic oil can be filled into a gear shifting clutch at full speed, and gear shifting time is effectively shortened.

Description

A kind of hydraulic gear-shifting pressure controlled valve
Technical field
The utility model relates to a kind of hydraulic gear-shifting pressure controlled valve, particularly a kind of hydraulic gear-shifting pressure controlled valve that can effectively shorten the large-scale engineering machinery gearshift time.
Background technique
Along with development and the maturation of engineering machinery in China, people require more and more higher for shift quality, and the dynamic power shift gear box at home application on the engineering machinery is also more and more universal.The key property of dynamic power shift gear box shift gears exactly stationarity and rapidity mainly guarantee by hydraulic gear-shifting pressure controlled valve control shift clutch.
Need experienced three stages in the shift clutch cohesive process: fast oil-filled, buffering is boosted and step is boosted.Wherein, the quick oil-filled stage need to overcome the precompression of shift clutch release spring, eliminates the gap of friction plate, and this stage directly affects the gearshift time.
Present hydraulic gear-shifting pressure controlled valve on the market extensively adopts structure shown in Figure 1, and it mainly comprises valve body (1), adjusting pressuring valve core (2), accumulator main spring (4), accumulator auxiliary spring (5), accumulator plunger (6), restriction (9), pressure setting valve core spring (10), pressure setting spool (12) etc.Adopt the hydraulic gear-shifting pressure controlled valve of this structure, at the gearshift initial stage, the shift clutch oil cylinder is oil-filled rapidly, overcome the precompression of shift clutch release spring at hydraulic oil, in the process in the gap of elimination friction plate, the oil pressure at adjusting pressuring valve core oil outlet place rises, and directly act on the adjusting pressuring valve core left end, cause that adjusting pressuring valve core moves to right, thereby in the situation that causes not eliminating fully in shift clutch friction plate gap, the adjusting pressuring valve core oil outlet reduces, and fluid can not be filled with the shift clutch oil cylinder fast, finally cause the shift clutch Oil feeding process to slow down, the gearshift time increases.
Summary of the invention
In order to overcome the deficiency of said structure hydraulic gear-shifting pressure controlled valve, the utility model aims to provide a kind of novel hydraulic gearshift pressure controlled valve that can effectively shorten the gearshift time.
The technological scheme that its technical problem that solves the utility model adopts is: a kind of hydraulic gear-shifting pressure controlled valve mainly comprises valve body (1), adjusting pressuring valve core (2), accumulator main spring (4), accumulator auxiliary spring (5), accumulator plunger (6), restriction (9), pressure setting valve core spring (10), pressure setting spool (12), time delay slide block (15).Described adjusting pressuring valve core has the through hole that connects adjusting pressuring valve core along axis direction, and described time delay slide block is assemblied in the through hole of described adjusting pressuring valve core.
Described adjusting pressuring valve core both ends of the surface are respectively along the axis direction perforate, and two bore dias are different, and macropore is away from the accumulator plunger, and aperture is near the accumulator plunger, and the different hole of described two diameters is connected, and forms described adjusting pressuring valve core along the through hole of axis direction.
Described time delay slide block is assemblied in the macropore of described adjusting pressuring valve core axis direction, and cooperates with described macropore motive sealing.
Described adjusting pressuring valve core and accumulator plunger interact by the accumulator main spring; Described time delay slide block and accumulator plunger interact by the accumulator auxiliary spring; The pretightening force of described accumulator auxiliary spring and spring rate are respectively less than pretightening force and the spring rate of described accumulator main spring.
Preferably, what have in the scope away from a side end face 0-9 millimeter of accumulator plunger of the described adjusting pressuring valve core of distance that at least one radially connects described adjusting pressuring valve core crosses oil groove or oil-through hole, and the described cross-section area of oil groove or oil-through hole of crossing is between the 0.03-60 square millimeter.
Described adjusting pressuring valve core filler opening links to each other with oil pump through the oily passage of oil pump, oil outlet links to each other with adjusting pressuring valve core guide oil pocket and pressure setting spool filler opening, simultaneously, link to each other with the shift clutch oil cylinder through shift clutch oil cylinder passage, through linking to each other with accumulator back of the body chamber behind the restriction; Accumulator back of the body chamber links to each other by the oilhole on the adjusting pressuring valve core with the accumulator spring chamber; The accumulator spring chamber links to each other with pressure setting spool oil outlet.
Under the original state, described adjusting pressuring valve core is in the high order end position under the effect of accumulator main spring; Described time delay slide block is in the high order end position under the effect of accumulator auxiliary spring; Described accumulator plunger is in the low order end position under the effect of accumulator main spring and accumulator auxiliary spring; Described pressure setting spool is in the high order end position under the effect of pressure setting valve core spring.The accumulator spring chamber links to each other with drainback passage (logical fuel tank) by the pressure setting spool, and the hydraulic oil in the accumulator spring chamber flows back to fuel tank.
During gearshift, constantly oil-filled along with the shift clutch oil cylinder, hydraulic oil begins to overcome the precompression of shift clutch release spring, the gap of friction plate constantly reduces, in this process, the oil pressure at adjusting pressuring valve core oil outlet place rises, and enter adjusting pressuring valve core guide oil pocket, act on adjusting pressuring valve core and time delay slide block left end, because the pretightening force of accumulator auxiliary spring and spring rate be less than pretightening force and the spring rate of accumulator main spring, thus time delay slide block move right first, in this process, the adjusting pressuring valve core oil outlet keeps aperture maximum, make hydraulic oil can be filled with the fastest speed the shift clutch oil cylinder, effectively shorten the gearshift time, when time delay slide block arrives the ladder surface of the macropore of adjusting pressuring valve core upper shoulder hole and aperture intersection, begin to drive adjusting pressuring valve core and move to right, hydraulic gear-shifting pressure controlled valve pressure regulation process begins.
Along with adjusting pressuring valve core moves to right, the passage between accumulator back of the body chamber and accumulator spring chamber turns down gradually, until close.The hydraulic oil promotion accumulator plunger that enters accumulator back of the body chamber through restriction moves to left gradually, make accumulator main spring and the hardening of accumulator auxiliary spring, the oil pressure at adjusting pressuring valve core oil outlet place rises gradually, when increasing to certain value, the active force that described pressure setting spool overcomes the pressure setting valve core spring moves to right and opens, cut off simultaneously the oil circuit between accumulator spring chamber and the drainback passage (logical fuel tank), hydraulic oil enters the accumulator spring chamber by the pressure setting spool, the oil pressure of the oil pressure of accumulator spring chamber and accumulator back of the body chamber and adjusting pressuring valve core guide oil pocket equates and all equals the oil pressure at adjusting pressuring valve core oil outlet place at this moment, described adjusting pressuring valve core and time delay slide block are displaced downwardly to Far Left in the effect of accumulator main spring and accumulator auxiliary spring respectively, the accumulator plunger is displaced downwardly to rightmost in the effect of accumulator main spring and accumulator auxiliary spring, the oil pressure step at adjusting pressuring valve core oil outlet place rises to system's maximum value, and whole hydraulic gear-shifting pressure controlled valve pressure regulation process is finished.
The utility model can also be realized by following scheme: the as above described a kind of hydraulic gear-shifting pressure controlled valve of a scheme, described adjusting pressuring valve core both ends of the surface are respectively along the axis direction perforate, two bore dias are identical or diameter is different, be provided with the annular stop boss between the hole that described two diameters are identical or diameter is different, two holes are connected by the mesopore of annular stop boss, form described adjusting pressuring valve core along the through hole of axis direction.
Two time delay slide blocks are assemblied in respectively described adjusting pressuring valve core both ends of the surface along in the perforate of axis direction, and one of them time delay slide block contacts with another time delay slide block after passing the mesopore of annular stop boss.Cooperate with wherein time delay slide block motive sealing away from the hole of accumulator plunger, be slidingly matched near the hole of accumulator plunger and wherein time delay slide block, the mesopore of described annular stop boss does not adopt with the time delay slide block that passes annular stop boss mesopore and is sealed and matched.
Preferably, the time delay slide block in the described close hole of accumulator plunger axially has the oil-through hole of at least one perforation, and interacts by the accumulator auxiliary spring with the accumulator plunger.
During gearshift, constantly oil-filled along with the shift clutch oil cylinder, hydraulic oil begins to overcome the precompression of shift clutch release spring, the gap of friction plate constantly reduces, in this process, the oil pressure at adjusting pressuring valve core oil outlet place rises, and enter adjusting pressuring valve core guide oil pocket, act on adjusting pressuring valve core and time delay slide block left end, because the pretightening force of accumulator auxiliary spring and spring rate be less than pretightening force and the spring rate of accumulator main spring, thus two time delay slide blocks move right first, in this process, the adjusting pressuring valve core oil outlet keeps aperture maximum, make hydraulic oil can be filled with the fastest speed the shift clutch oil cylinder, effectively shorten the gearshift time, when arriving the annular stop boss away from the time delay slide block in the hole of accumulator plunger, begin to drive adjusting pressuring valve core and move to right, hydraulic gear-shifting pressure controlled valve pressure regulation process begins.
The realization principle of other processes of this scheme is identical with a upper scheme.
The beneficial effects of the utility model are, utilize time delay slide block that the moment that adjusting pressuring valve core begins to move is delayed, thereby can remain that in the quick oil-filled stage adjusting pressuring valve core oil outlet aperture is maximum, make hydraulic oil be filled with shift clutch with prestissimo, effectively shorten the gearshift time.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structural drawing of present hydraulic gear-shifting pressure controlled valve.
Fig. 2 is the utility model embodiment 1 structural drawing.
Fig. 3 is the utility model embodiment 2 structural drawing.
Among the figure, 1. valve body, 2. adjusting pressuring valve core, 3. oil pump comes oily passage, 4. accumulator main spring, 5. accumulator auxiliary spring, 6. accumulator plunger, 7. accumulator back of the body chamber, 8. accumulator spring chamber, 9. restriction, 10. pressure setting valve core spring, 11. drainback passages, 12. the pressure setting spool, 13. shift clutch oil cylinder passages, 14. adjusting pressuring valve core guide oil pockets, 15. time delay slide block, 16. time delay slide blocks, 17. annular stop boss
Embodiment
Embodiment 1:
Referring to Fig. 2, a kind of hydraulic gear-shifting pressure controlled valve mainly comprises valve body (1), adjusting pressuring valve core (2), accumulator main spring (4), accumulator auxiliary spring (5), accumulator plunger (6), restriction (9), pressure setting valve core spring (10), pressure setting spool (12), time delay slide block (15).Described adjusting pressuring valve core (2) has the through hole that connects adjusting pressuring valve core (2) along axis direction, and described time delay slide block (15) is assemblied in the through hole of described adjusting pressuring valve core (2).
Described adjusting pressuring valve core (2) both ends of the surface are respectively along the axis direction perforate, two bore dias are different, and macropore is away from accumulator plunger (6), and aperture is near accumulator plunger (6), the different hole of described two diameters is connected, and forms described adjusting pressuring valve core (2) along the through hole of axis direction.
Described time delay slide block (15) is assemblied in the macropore of described adjusting pressuring valve core (2) axis direction, and cooperates with described macropore motive sealing.
Described adjusting pressuring valve core (2) interacts by accumulator main spring (4) with accumulator plunger (6); Described time delay slide block (15) interacts by accumulator auxiliary spring (5) with accumulator plunger (6); The pretightening force of described accumulator auxiliary spring (5) and spring rate are respectively less than pretightening force and the spring rate of described accumulator main spring (4).
Preferably, what have in the scope away from a side end face 0-9 millimeter of accumulator plunger (6) of the described adjusting pressuring valve core of distance (2) that at least one radially connects described adjusting pressuring valve core (2) crosses oil groove or oil-through hole, and the described cross-section area of oil groove or oil-through hole of crossing is between the 0.03-60 square millimeter.
Described adjusting pressuring valve core (2) filler opening links to each other with oil pump through the oily passage of oil pump (3), oil outlet links to each other with adjusting pressuring valve core guide oil pocket (14) and pressure setting spool (12) filler opening, simultaneously, link to each other with the shift clutch oil cylinder through shift clutch oil cylinder passage (13), through linking to each other with accumulator back of the body chamber (7) behind the restriction (9); Accumulator back of the body chamber (7) links to each other by the oilhole on the adjusting pressuring valve core (2) with accumulator spring chamber (8); Accumulator spring chamber (8) links to each other with pressure setting spool (12) oil outlet.
Under the original state, described adjusting pressuring valve core (2) is in the high order end position under the effect of accumulator main spring (4); Described time delay slide block (15) is in the high order end position under the effect of accumulator auxiliary spring (5); Described accumulator plunger (6) is in the low order end position under the effect of accumulator main spring (4) and accumulator auxiliary spring (5); Described pressure setting spool (12) is in the high order end position under the effect of pressure setting valve core spring (10).Accumulator spring chamber (8) links to each other with drainback passage (11) (logical fuel tank) by pressure setting spool (12), and the hydraulic oil in the accumulator spring chamber (8) flows back to fuel tank.
During gearshift, constantly oil-filled along with the shift clutch oil cylinder, hydraulic oil begins to overcome the precompression of shift clutch release spring, the gap of friction plate constantly reduces, in this process, the oil pressure at adjusting pressuring valve core (2) oil outlet place rises, and enter adjusting pressuring valve core guide oil pocket (14), act on adjusting pressuring valve core (2) and time delay slide block (15) left end, because the pretightening force of accumulator auxiliary spring (5) and spring rate are less than pretightening force and the spring rate of accumulator main spring (4), so time delay slide block (15) moves right first, in this process, adjusting pressuring valve core (2) oil outlet keeps aperture maximum, make hydraulic oil can be filled with the fastest speed the shift clutch oil cylinder, effectively shorten the gearshift time, when time delay slide block (15) arrives the ladder surface of the macropore of adjusting pressuring valve core (2) upper shoulder hole and aperture intersection, begin to drive adjusting pressuring valve core (2) and move to right, hydraulic gear-shifting pressure controlled valve pressure regulation process begins.
Along with adjusting pressuring valve core (2) moves to right, the passage between accumulator back of the body chamber (7) and accumulator spring chamber (8) turns down gradually, until close.The hydraulic oil promotion accumulator plunger (6) that enters accumulator back of the body chamber (7) through restriction (9) moves to left gradually, make accumulator main spring (4) and accumulator auxiliary spring (5) hardening, the oil pressure at adjusting pressuring valve core (2) oil outlet place rises gradually, when increasing to certain value, the active force that described pressure setting spool (12) overcomes pressure setting valve core spring (10) moves to right and opens, cut off simultaneously the oil circuit between accumulator spring chamber (8) and the drainback passage (11) (logical fuel tank), hydraulic oil enters accumulator spring chamber (8) by pressure setting spool (12), the oil pressure of the oil pressure of accumulator spring chamber this moment (8) and accumulator back of the body chamber (7) and adjusting pressuring valve core guide oil pocket (14) equates and all equals the oil pressure at adjusting pressuring valve core (2) oil outlet place, described adjusting pressuring valve core (2) and time delay slide block (15) are displaced downwardly to Far Left in the effect of accumulator main spring (4) and accumulator auxiliary spring (5) respectively, accumulator plunger (6) is displaced downwardly to rightmost in the effect of accumulator main spring (4) and accumulator auxiliary spring (5), the oil pressure step at adjusting pressuring valve core (2) oil outlet place rises to system's maximum value, and whole hydraulic gear-shifting pressure controlled valve pressure regulation process is finished.
Embodiment 2:
Referring to Fig. 3, a kind of hydraulic gear-shifting pressure controlled valve as described in Example 1, described adjusting pressuring valve core (2) both ends of the surface are respectively along the axis direction perforate, two bore dias are identical or diameter is different, be provided with annular stop boss (17) between the hole that described two diameters are identical or diameter is different, two holes are connected by the mesopore of annular stop boss (17), form described adjusting pressuring valve core (2) along the through hole of axis direction.
Two time delay slide blocks (15) and (16) are assemblied in respectively described adjusting pressuring valve core (2) both ends of the surface along in the perforate of axis direction, and wherein time delay slide block (16) contacts with another time delay slide block (15) after passing the mesopore of annular stop boss (17).Cooperate with wherein time delay slide block (15) motive sealing away from the hole of accumulator plunger (6), be slidingly matched near the hole of accumulator plunger (6) and time delay slide block (16) wherein, the mesopore of annular stop boss (17) and time delay slide block (16) do not adopt and are sealed and matched.
Preferably, described time delay slide block (16) axially has the oil-through hole of at least one perforation, and interacts by accumulator auxiliary spring (5) with accumulator plunger (6).
During gearshift, constantly oil-filled along with the shift clutch oil cylinder, hydraulic oil begins to overcome the precompression of shift clutch release spring, the gap of friction plate constantly reduces, in this process, the oil pressure at adjusting pressuring valve core (2) oil outlet place rises, and enter adjusting pressuring valve core guide oil pocket (14), act on adjusting pressuring valve core (2) and time delay slide block (15) left end, because the pretightening force of accumulator auxiliary spring (5) and spring rate are less than pretightening force and the spring rate of accumulator main spring (4), so time delay slide block (15) drives time delay slide block (16) and moves right first, in this process, adjusting pressuring valve core (2) oil outlet keeps aperture maximum, make hydraulic oil can be filled with the fastest speed the shift clutch oil cylinder, effectively shorten the gearshift time, when time delay slide block (15) arrives annular stop boss (17), begin to drive adjusting pressuring valve core (2) and move to right, hydraulic gear-shifting pressure controlled valve pressure regulation process begins.
The realization principle of other processes of this embodiment is identical with embodiment 1.

Claims (10)

1. hydraulic gear-shifting pressure controlled valve, mainly comprise valve body, adjusting pressuring valve core, accumulator main spring, accumulator auxiliary spring, accumulator plunger, restriction, pressure setting valve core spring, pressure setting spool, time delay slide block, it is characterized in that: described adjusting pressuring valve core has the through hole that connects adjusting pressuring valve core along axis direction, and described time delay slide block is assemblied in the through hole of described adjusting pressuring valve core.
2. a kind of hydraulic gear-shifting pressure controlled valve according to claim 1 is characterized in that: the pretightening force of described accumulator auxiliary spring and spring rate are respectively less than pretightening force and the spring rate of described accumulator main spring.
3. a kind of hydraulic gear-shifting pressure controlled valve according to claim 1, it is characterized in that: what have in the scope away from a side end face 0-9 millimeter of accumulator plunger of the described adjusting pressuring valve core of distance that at least one radially connects described adjusting pressuring valve core crosses oil groove or oil-through hole, and the described cross-section area of oil groove or oil-through hole of crossing is between the 0.03-60 square millimeter.
4. a kind of hydraulic gear-shifting pressure controlled valve according to claim 1, it is characterized in that: described adjusting pressuring valve core both ends of the surface are respectively along the axis direction perforate, two bore dias are different, macropore is away from the accumulator plunger, aperture is near the accumulator plunger, the different hole of described two diameters is connected, and forms described adjusting pressuring valve core along the through hole of axis direction.
5. a kind of hydraulic gear-shifting pressure controlled valve according to claim 4, it is characterized in that: described time delay slide block is assemblied in the macropore of described adjusting pressuring valve core axis direction, and cooperate with described macropore motive sealing, described time delay slide block and accumulator plunger interact by the accumulator auxiliary spring.
6. a kind of hydraulic gear-shifting pressure controlled valve according to claim 1, it is characterized in that: described adjusting pressuring valve core both ends of the surface are respectively along the axis direction perforate, two bore dias are identical or diameter is different, be provided with the annular stop boss between the hole that described two diameters are identical or diameter is different, two holes are connected by the mesopore of annular stop boss, form described adjusting pressuring valve core along the through hole of axis direction.
7. a kind of hydraulic gear-shifting pressure controlled valve according to claim 6, it is characterized in that: two time delay slide blocks are assemblied in respectively described adjusting pressuring valve core both ends of the surface along in the perforate of axis direction, and one of them time delay slide block contacts with another time delay slide block after passing the mesopore of annular stop boss.
8. a kind of hydraulic gear-shifting pressure controlled valve according to claim 7, it is characterized in that: cooperate with wherein time delay slide block motive sealing away from the hole of accumulator plunger, be slidingly matched near the hole of accumulator plunger and time delay slide block wherein, the mesopore of annular stop boss does not adopt with the time delay slide block that passes annular stop boss mesopore and is sealed and matched.
9. a kind of hydraulic gear-shifting pressure controlled valve according to claim 7 is characterized in that: the oil-through hole that axially has at least one perforation near the time delay slide block in the hole of accumulator plunger.
10. a kind of hydraulic gear-shifting pressure controlled valve according to claim 7 is characterized in that: interact by the accumulator auxiliary spring near the time delay slide block in the hole of accumulator plunger and accumulator plunger.
CN 201220588054 2012-11-09 2012-11-09 Hydraulic gear shifting pressure control valve Withdrawn - After Issue CN202867804U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220588054 CN202867804U (en) 2012-11-09 2012-11-09 Hydraulic gear shifting pressure control valve

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Application Number Priority Date Filing Date Title
CN 201220588054 CN202867804U (en) 2012-11-09 2012-11-09 Hydraulic gear shifting pressure control valve

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CN202867804U true CN202867804U (en) 2013-04-10

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CN 201220588054 Withdrawn - After Issue CN202867804U (en) 2012-11-09 2012-11-09 Hydraulic gear shifting pressure control valve

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102927266A (en) * 2012-11-09 2013-02-13 四川大学 Pressure control valve capable of shifting gears through hydraulic pressure
CN103711808A (en) * 2013-12-13 2014-04-09 杭州发达齿轮箱集团有限公司 Three-level pressure control valve for controlling wet clutch, and control method thereof
CN103836019A (en) * 2014-03-10 2014-06-04 四川大学 Fast-charging hydraulic shift valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102927266A (en) * 2012-11-09 2013-02-13 四川大学 Pressure control valve capable of shifting gears through hydraulic pressure
CN103711808A (en) * 2013-12-13 2014-04-09 杭州发达齿轮箱集团有限公司 Three-level pressure control valve for controlling wet clutch, and control method thereof
CN103711808B (en) * 2013-12-13 2016-04-27 杭州发达齿轮箱集团有限公司 A kind of three stage pressure control valve and controlling methods thereof controlling wet clutch
CN103836019A (en) * 2014-03-10 2014-06-04 四川大学 Fast-charging hydraulic shift valve

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Granted publication date: 20130410

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