CN202417923U - Constant-power valve - Google Patents
Constant-power valve Download PDFInfo
- Publication number
- CN202417923U CN202417923U CN 201120537991 CN201120537991U CN202417923U CN 202417923 U CN202417923 U CN 202417923U CN 201120537991 CN201120537991 CN 201120537991 CN 201120537991 U CN201120537991 U CN 201120537991U CN 202417923 U CN202417923 U CN 202417923U
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- piston
- piston rod
- guide cover
- spring
- regulating
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Abstract
The utility model relates to a constant-power valve, which comprises a piston guide sleeve, wherein a load pressure port, a side middle hole and an oil discharge hole are arranged on the outer wall of the piston guide sleeve; a valve core is arranged in the piston guide sleeve and is internally provided with a piston rod; the end part of the piston guide sleeve, which is connected with a protection cap correspondingly, is internally provided with a first spring seat; the end part of the piston rod, which extends into the protection cap correspondingly, is provided with a reset adjustment spring; a high-pressure oil inlet is arranged on an adjustment piston; the end part of the piston rod, which extends into the adjustment piston correspondingly, penetrates through a spherical seat and is matched with the spherical seat correspondingly, the piston rod is internally provided with a hydraulic oil through hole that is distributed along the axial line of the piston rod, and the hydraulic oil through hole is communicated with a hydraulic oil outlet; and the end part of the piston rod, which extends into the adjustment piston correspondingly, is provided with a coupler, the coupler is internally provided with a one-way valve spring, and the one-way valve spring is correspondingly matched with a steel ball arranged in the piston rod and used for plugging the hydraulic oil through hole. The constant-power valve is compact in structure, improves the efficiency of a hydraulic system and lowers the energy consumption of the hydraulic system.
Description
Technical field
The utility model relates to a kind of valve body structure that is used for oil hydraulic pump, and especially a kind of constant power valve belongs to the technical field of oil hydraulic pump.
Background technique
Traditional hydraulic system is controlled its flow and pressure through valve, but is that pressure valve or Flow valve all can produce heat loss, causes big, the inefficiency of system's heating value, if this loss of metering pump meeting is very big.Existing constant pressure variable displacement pump can be applied in the system of pressurize and pressure limiting requirement, but the unnecessary flow of variable displacement pump still flows back to fuel tank through relief valve, and efficient is high not as permanent power and variable pump.
Summary of the invention
The purpose of the utility model is to overcome the deficiency that exists in the existing technology, and a kind of constant power valve is provided, its compact structure, the efficient of raising hydraulic system, the energy consumption of reduction hydraulic system.
According to the technological scheme that the utility model provides, said constant power valve comprises the piston guide cover, and the outer wall of said piston guide cover is provided with induced pressure interface, side direction mesopore and the unloading port that connects said piston guide cover; One end of said piston guide cover is provided with the protective cap that is fastenedly connected, and the piston guide cover stretches in the regulating piston corresponding to the other end that links to each other with protective cap, and can in regulating piston, move; Be provided with spool in the piston guide cover, be provided with piston rod in the said spool, spool can be in the piston guide cover mobile and that put with piston guide induced pressure interface, side direction mesopore and unloading port's corresponding matching; The two ends of piston rod are stretched into respectively in protective cap and the regulating piston; Be provided with first spring seat in the end that the piston guide cover is corresponding with protective cap links to each other, said first spring socket sleeve contacts on piston rod and with the end of spool; Piston rod is with clamping bolt corresponding to the end of stretching in the protective cap, and said clamping bolt is provided with the adjustment screw that is fastenedly connected, and is provided with the adjustment spring that resets between the said adjustment screw and first spring seat; Regulating piston is provided with the high pressure oil import, is provided with spheric seating between the outlet of the hydraulic oil of high pressure oil import and regulating piston end, and said spheric seating is positioned at regulating piston, and is complementary with cavity in the regulating piston; Piston rod passes spheric seating and corresponding cooperation with spheric seating corresponding to the end of stretching in the regulating piston, is provided with the hydraulic oil through hole that distributes along the piston rod axis in the piston rod, and said hydraulic oil through hole can be connected with the hydraulic oil outlet; Piston rod is provided with joiner corresponding to the end of stretching into regulating piston, and an end of said joiner stretches in the piston rod, and the other end stretches in the regulating piston and exports corresponding with hydraulic oil; Be provided with check valve spring in the joiner, an end of said check valve spring links to each other with regulating piston, is used for the corresponding cooperation of steel ball of shutoff hydraulic pressure oil hole in the other end and the piston rod.
The said adjustment spring that resets comprises big spring and little spring, and an end of said big spring is enclosed within on first spring seat, and the other end is installed on the adjustment screw through the adjustment screw-nut that is positioned on the adjustment screw; Be provided with second spring seat in the adjustment screw, said second spring socket sleeve is on piston rod, and said little spring is installed on the piston rod through first spring seat and second spring seat; Second spring seat links to each other with clamping bolt through press-on pins corresponding to the other end that links to each other with little spring.
Said clamping bolt is fastenedly connected through clamping bolt nut and adjustment screw.Said spheric seating is equipped with packing ring through the hole with the spiral back-up ring corresponding to the other end that links to each other with piston rod, through spheric seating, packing ring and hole with the corresponding matching of spiral back-up ring can the blocking high-pressure oil inlet with the hydraulic oil outlet between the cavity of corresponding regulating piston.
Be provided with an O type circle between the connecting part of said protective cap and piston guide cover.One end of the corresponding contiguous protective cap of said piston guide cover is provided with the 2nd O type circle.
Said piston rod is with axle-steel silk back-up ring corresponding to an end that stretches in the adjustment screw.Said piston guide cover is equipped with piston ring corresponding to the side that induced pressure interface, side direction mesopore and unloading port are set, and said piston ring set puts in piston guide.
The axis of said piston guide cover and the axis of regulating piston and protective cap are located along the same line, and the axis of the axis of spool and piston rod and piston guide cover is located along the same line.Said regulating piston links to each other with the variable displacement pump swash plate corresponding to the other end that links to each other with the piston guide cover.
The advantage of the utility model: the piston guide cover links to each other with the variable displacement pump swash plate through regulating piston; When injecting high pressure oil through the induced pressure interface, spool moves spool and side direction mesopore and unloading port's corresponding matching in the piston guide cover; High pressure oil flows out through the side direction mesopore and flows in the regulating piston through the high pressure oil import; High pressure oil acts on the spheric seating, and passes through the inclination angle that regulating piston changes the variable displacement pump swash plate, changes the flow of variable displacement pump; When the elastic force of high pressure oil and big spring and little spring balanced each other, regulating piston and piston guide cover were in steady state, can access pressure stable and flow; Position through the adjustment regulating piston can access required pressure and flow; Regulate the position of adjustment screw simultaneously, can obtain corresponding pressure-flow characteristic curve, make the pressure-flow characteristic curve of oil hydraulic pump be similar to hyperbola; Make full use of motive force; Compact structure, the efficient of raising hydraulic system, the energy consumption of reduction hydraulic system.
Description of drawings
Fig. 1 is the structural representation of the utility model and variable displacement pump swash plate corresponding matching.
The another kind of view that Fig. 2 matches with the piston guide inner room for the utility model regulating piston.
Fig. 3 is the user mode schematic diagram of the utility model.
Embodiment
Below in conjunction with concrete accompanying drawing and embodiment the utility model is described further.
Like Fig. 1 ~ shown in Figure 3: the utility model comprises regulating piston 1; Joiner 2; Packing ring 3; Piston rod 4; Spool 5; Piston guide cover 6; First spring seat 7; Press-on pins 8; Adjustment screw 9; Adjustment screw-nut 10; Clamping bolt 11; Clamping bolt nut 12; Protective cap 13; Axle-steel silk back-up ring 14; Big spring 15; Second spring seat 16; Little spring 17; The one O type circle 18; Piston ring 19; The hole is with spiral back-up ring 20; Spheric seating 21; Steel ball 22; Check valve spring 23; Variable displacement pump swash plate 24; Hydraulic oil through hole 25; Side direction mesopore 26; High pressure filler opening 27; The 2nd O type circle 28; Induced pressure interface P and the T of unloading port.
As depicted in figs. 1 and 2: said constant power valve comprises piston guide cover 6, and an end of said piston guide cover 6 is provided with the protective cap 13 that is fastenedly connected, and the other end is provided with regulating piston 1.Piston guide cover 6 stretches in the regulating piston 1 corresponding to the end that links to each other with regulating piston 1, and can relatively move with regulating piston 1.The axis of regulating piston 1, piston guide cover 6 and protective cap 13 is located along the same line; And link to each other with variable displacement pump swash plate 24 through regulating piston 1, promote variable displacement pump swash plate 24 through regulating piston 1, make the inclination angle change of variable displacement pump swash plate 24, thereby can change the variable pump delivery.13 of piston guide cover 6 and protective caps link to each other through an O type circle 18.Simultaneously, piston guide cover 6 ends corresponding to contiguous protective cap 13 are provided with the 2nd O type circle 28, and said the 2nd O type circle 18 is enclosed within piston guide cover 6 corresponding step places.The outer wall of piston guide cover 6 is provided with induced pressure interface P, side direction mesopore 26 and the T of unloading port that connects piston guide cover 6; Said side direction mesopore 26 is between induced pressure interface P and the T of unloading port; The contiguous regulating piston 1 of induced pressure interface P, the contiguous protective cap 13 of the T of unloading port.All be with piston ring 19 at induced pressure interface P, side direction mesopore 26 and the T of unloading port corresponding to contiguous regulating piston 1 one sides.
Be provided with spool 5 in the piston guide cover 6, be provided with piston rod 4 in the said spool 5, the axis of the axis of said piston rod 4 and spool 5 and piston guide cover 6 is located along the same line.Spool 5 can overlap in 6 in piston guide and move, and spool 5 can overlap induced pressure interface P, side direction mesopore 26 and the corresponding cooperation of the T of unloading port on 6 with piston guide.When in piston guide cover 6, injecting high pressure oil through induced pressure interface P; Can promote spool 5 moves in piston guide cover 6; And can shutoff or open side direction mesopore 26 and the T of unloading port on the piston guide cover 6; And spool 5 can overlap 6 corresponding matching with piston guide, makes piston guide cover 6 and 1 of regulating piston relatively move.The two ends of piston rod 4 are stretched into respectively in protective cap 13 and the regulating piston 1.
Piston guide cover 6 corresponding to end that protective cap 13 links to each other in be provided with first spring seat 7, said first spring seat 7 is enclosed within on the piston rod 4, and links to each other corresponding to the end that is close to protective cap 13 with spool 5.Through first spring seat 7 the adjustment spring that resets is installed on the piston rod 4, the said adjustment spring that resets comprises big spring 15 and little spring 17.Can balance each other with the active force of high pressure oil through the adjustment spring that resets, make constant power valve can keep a kind of steady state spool 5.For the said adjustment spring that resets can be installed; Piston rod 4 is provided with clamping bolt 11 corresponding to the end of stretching in the protective cap 13; Centre area in the said clamping bolt 11 is provided with through hole; Said through hole is connected with piston rod 4 interior hydraulic oil through holes 25, and said hydraulic oil through hole 25 distributes and perforation piston rod 4 along the axis of piston rod 4.Clamping bolt 11 is provided with the adjustment screw 9 that is fastenedly connected, and clamping bolt 11 is fastenedly connected through clamping bolt nut 12 and adjustment screw 9.Adjustment screw 9 is provided with adjustment screw-nut 10; Big spring 15 is positioned at first spring seat 7 and adjusts 9 on screw, and an end of big spring 15 links to each other with first spring seat 7, and the other end is enclosed within on the adjustment screw 9, and positions through the adjustment screw-nut 10 on the adjustment screw 9.Simultaneously, be provided with second spring seat 16 in the adjustment screw 9, little spring 17 is installed on the piston rod 4 through first spring seat 7 and second spring seat 16.Second spring seat 16 links to each other with clamping bolt 11 through press-on pins 8 corresponding to the other end that links to each other with little spring 17, thereby can support the location to second spring seat 16.Said piston rod 4 is with axle-steel silk back-up ring 14 corresponding to an end that stretches in the adjustment screw 9, and said axle-steel silk back-up ring 14 is positioned between the positioning step of clamping bolt 11 and adjustment screw 9, and adjustment screw 9 links to each other with piston rod 4 through positioning step.
Regulating piston 1 is provided with high pressure oil import 27; Regulating piston 1 is provided with hydraulic oil outlet L corresponding to the other end away from piston guide cover 6; Said high pressure oil import 27 connects regulating piston 1; Hydraulic oil outlet L distributes perpendicular to the axis of regulating piston 1, and hydraulic oil outlet L can be connected with the cavity in the regulating piston 1.In order to promote variable displacement pump swash plate 24 through regulating piston 1, be provided with spheric seating 21 in the said regulating piston 1, said spheric seating 21 is positioned at hydraulic oil outlet L and 27 of high pressure oil imports, and contiguous hydraulic oil exports L.Spheric seating 21 is spherical shape, and spheric seating 21 is equipped with packing ring 3 through the hole with spiral back-up ring 20 corresponding to an end of adjacent piston guide sleeve 6; Spheric seating 21 can blocking high-pressure oil inlet 27 through packing ring 3 and hole with spiral back-up ring 20 corresponding matching and hydraulic oil outlet L between the cavity of regulating piston 1, avoid flowing out from hydraulic oil outlet L from the high pressure oil that high pressure oil import 27 gets into.
Piston rod 4 passes the contiguous hydraulic oil outlet in spheric seating 21 backs L corresponding to the end of stretching into regulating piston 1, and the hydraulic oil through hole 25 in the said piston rod 4 is corresponding with hydraulic oil outlet L, and hydraulic oil outlet L can be connected with hydraulic oil through hole 25.After hydraulic oil through hole 25 and hydraulic oil outlet L was communicated with, the hydraulic oil piston rod 4 in can export L inflow and hydraulic oil through hydraulic oil and export in the one-way valve that L links to each other.Piston rod 4 is corresponding to being provided with joiner 2 in the end of passing spheric seating 21, an end of said joiner 2 stretches in the piston rod 4, and the other end is positioned at hydraulic oil outlet L.Be provided with check valve spring 23 in the connector 2, an end of said check valve spring 23 links to each other with regulating piston 1, the steel ball 22 corresponding cooperations in the other end and the piston rod 4.Steel ball 22 is positioned at the end of hydraulic oil through hole 25, through the connecting path between steel ball 22 ability shutoff hydraulic pressure oil holes 25 and hydraulic oil outlet L.When the hydraulic fluid pressure in the piston rod 4 during greater than the elastic force of check valve spring 23, steel ball 22 is pushed to hydraulic oil outlet L one side, thereby the hydraulic oil in the piston rod 4 can flow out through hydraulic oil outlet L.
Like Fig. 1 ~ shown in Figure 3: the constant power valve of the utility model is used for volume adjustable hydraulic pump, because said constant power valve volume is less, it is integrated on the variable displacement pump.Regulating piston 1 is connected with variable displacement pump swash plate 24; P connects high pressure oil through the induced pressure interface.When the high pressure oil that gets into from induced pressure interface P gets into 5 of piston guide cover 6 and spools, promote spool 5 and overlap 6 to moving away from regulating piston 1 direction in piston guide.After spool 5 moves in piston guide cover 6, spool 5 and side direction mesopore 26 and the corresponding cooperation of the T of unloading port, high pressure oil can flow out through side direction mesopore 26, and the T of unloading port is closed.The high pressure oil that flows out through side direction mesopore 26 passes through one-way valve after the high pressure oil import 27 on the regulating piston 1 gets in the regulating pistons 1.High pressure oil behind the entering regulating piston 1 is because spheric seating 21, packing ring 3 and hole can not export the L outflow from hydraulic oil with spiral back-up ring 20; And promote regulating piston 1 to the direction motion of overlapping 6 away from piston guide through spheric seating 21, the high pressure oil in the regulating piston 1 can promote piston guide cover 6 to moving away from regulating piston 1 simultaneously.Change corresponding inclination angle when regulating piston 1 promotes variable displacement pump swash plate 24 under the high pressure oil effect, when the active force that while and big spring 15 and little spring are 17 balanced each other, whole constant power valve was in steady state, thereby can obtain a pressure stable and flow.The active force that gets into the hydraulic oil generation in the piston rod 4 acts on the steel ball 22; Active force on acting on steel ball 22 is during greater than the elastic force of check valve spring 23; Steel ball 22 thrust hydraulic oil through holes 25; Thereby the hydraulic oil in the piston rod 4 flows out through hydraulic oil outlet L, flows in the one-way valve that links to each other with hydraulic oil outlet L.State when being in 0 discharge capacity for constant power valve among Fig. 1, the state when Fig. 2 is in maximum pump discharge for constant power valve.When the position of regulating piston 1 is regulated, can access the free position between constant power valve maximum pump discharge and 0 discharge capacity, reach the variable pump delivery is accomplished stepless variation.When regulating adjusting screw 9, big spring 15 and little spring 17 corresponding reset response power can be regulated, thereby the pressure-flow characteristic curve of variable displacement pump can be changed, make variable displacement pump can adapt to the different working requirement.When stopping when induced pressure interface P injects high pressure oil, spool 5 and piston guide cover 6 reset down at big spring 15 and little spring 17 effects, and high pressure oil is through the T of unloading port emptying, and constant power valve 0 displacement condition that resets is convenient to use next time.
The utility model piston guide cover 6 links to each other with variable displacement pump swash plate 24 through regulating piston 1; When injecting high pressure oil through induced pressure interface P, spool 5 moves in piston guide cover 6, spool 5 and side direction mesopore 26 and the T of unloading port corresponding matching; High pressure oil flows out through side direction mesopore 26 and flows in the regulating piston 1 through high pressure oil import 27; High pressure oil acts on the spheric seating 21, and passes through the inclination angle that regulating piston 1 changes variable displacement pump swash plate 24, changes the flow of variable displacement pump; When the elastic force of high pressure oil and big spring 15 and little spring 17 balanced each other, regulating piston 1 and piston guide cover 6 were in steady state, can access pressure stable and flow; Position through adjustment regulating piston 1 can access required pressure and flow; Regulate the position of adjustment screw 9 simultaneously, can obtain corresponding pressure-flow characteristic curve, make the pressure-flow characteristic curve of oil hydraulic pump be similar to hyperbola; Make full use of motive force; Compact structure, the efficient of raising hydraulic system, the energy consumption of reduction hydraulic system.
Claims (10)
1. constant power valve is characterized in that: comprise piston guide cover (6), the outer wall of said piston guide cover (6) is provided with induced pressure interface (P), side direction mesopore (26) and the unloading port (T) that connects said piston guide cover (6); One end of said piston guide cover (6) is provided with the protective cap (13) that is fastenedly connected, and piston guide cover (6) stretches in the regulating piston (1) corresponding to the other end that links to each other with protective cap (13), and can in regulating piston (1), move; Be provided with spool (5) in the piston guide cover (6); Be provided with piston rod (4) in the said spool (5), spool (5) can in piston guide cover (6), move and with piston guide cover (6) on induced pressure interface (P), side direction mesopore (26) and unloading port (T) corresponding matching; The two ends of piston rod (4) are stretched into respectively in protective cap (13) and the regulating piston (1); Be provided with first spring seat (7) in the end that piston guide cover (6) is corresponding with protective cap (13) links to each other, said first spring seat (7) is enclosed within piston rod (4) and upward and with the end of spool (5) contacts; Piston rod (4) is with clamping bolt (11) corresponding to the end of stretching in the protective cap (13); Said clamping bolt (11) is provided with the adjustment screw (9) that is fastenedly connected, and is provided with the adjustment spring that resets between said adjustment screw (9) and first spring seat (7); Regulating piston (1) is provided with high pressure oil import (27); Be provided with spheric seating (21) between the hydraulic oil outlet (L) of high pressure oil import (27) and regulating piston (1) end; Said spheric seating (21) is positioned at regulating piston (1), and is complementary with the interior cavity of regulating piston (1); Piston rod (4) corresponding to stretch into end in the regulating piston (1) pass spheric seating (21) and with the corresponding cooperation of spheric seating (21); Be provided with the hydraulic oil through hole (25) that distributes along piston rod (4) axis in the piston rod (4), said hydraulic oil through hole (25) can export (L) and be connected with hydraulic oil; Piston rod (4) is provided with joiner (2) corresponding to the end of stretching into regulating piston (1), and an end of said joiner (2) stretches in the piston rod (4), and it is interior and corresponding with hydraulic oil outlet (L) that the other end stretches into regulating piston (1); Be provided with check valve spring (23) in the joiner (4), an end of said check valve spring (23) links to each other with regulating piston (1), is used for the corresponding cooperation of steel ball (22) of shutoff hydraulic pressure oil hole (25) in the other end and the piston rod (4).
2. constant power valve according to claim 1; It is characterized in that: the said adjustment spring that resets comprises big spring (15) and little spring (17); One end of said big spring (15) is enclosed within on first spring seat (7), and the other end is installed on the adjustment screw (9) through the adjustment screw-nut (10) that is positioned on the adjustment screw (9); Be provided with second spring seat (16) in the adjustment screw (9), said second spring seat (16) is enclosed within on the piston rod (4), and said little spring (17) is installed on the piston rod (4) through first spring seat (7) and second spring seat (16); Second spring seat (16) links to each other with clamping bolt (11) through press-on pins (8) corresponding to the other end that links to each other with little spring (17).
3. constant power valve according to claim 1 is characterized in that: said clamping bolt (11) is fastenedly connected through clamping bolt nut (12) and adjustment screw (9).
4. constant power valve according to claim 1; It is characterized in that: said spheric seating (21) is equipped with packing ring (3) through the hole with spiral back-up ring (20) corresponding to the other end that links to each other with piston rod (4), through spheric seating (21), packing ring (3) and hole with the corresponding matching of spiral back-up ring (20) can blocking high-pressure oil inlet (27) with hydraulic oil outlet (L) between the cavity of corresponding regulating piston (1).
5. constant power valve according to claim 1 is characterized in that: be provided with an O type circle (18) between the connecting part of said protective cap (13) and piston guide cover (6).
6. constant power valve according to claim 1 is characterized in that: an end of the corresponding contiguous protective cap of said piston guide cover (6) (13) is provided with the 2nd O type circle (28).
7. constant power valve according to claim 1 is characterized in that: said piston rod (4) is with axle-steel silk back-up ring (14) corresponding to an end that stretches in the adjustment screw (9).
8. constant power valve according to claim 1; It is characterized in that: said piston guide cover (6) is equipped with piston ring (19) corresponding to the side that induced pressure interface (P), side direction mesopore (26) and unloading port (T) are set, and said piston ring (19) is enclosed within on the piston guide cover (6).
9. constant power valve according to claim 1; It is characterized in that: the axis of the axis of said piston guide cover (6) and regulating piston (1) and protective cap (7) is located along the same line, and the axis of spool (5) and piston rod (4) and the axis of piston guide cover (6) are located along the same line.
10. constant power valve according to claim 1 is characterized in that: said regulating piston (1) links to each other with variable displacement pump swash plate (24) corresponding to the other end that links to each other with piston guide cover (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120537991 CN202417923U (en) | 2011-12-20 | 2011-12-20 | Constant-power valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120537991 CN202417923U (en) | 2011-12-20 | 2011-12-20 | Constant-power valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202417923U true CN202417923U (en) | 2012-09-05 |
Family
ID=46742694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120537991 Withdrawn - After Issue CN202417923U (en) | 2011-12-20 | 2011-12-20 | Constant-power valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202417923U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425541A (en) * | 2011-12-20 | 2012-04-25 | 无锡威孚精密机械制造有限责任公司 | Constant power valve |
| CN104454489A (en) * | 2014-12-04 | 2015-03-25 | 中航力源液压股份有限公司 | Integrated compact type constant power variable device |
-
2011
- 2011-12-20 CN CN 201120537991 patent/CN202417923U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425541A (en) * | 2011-12-20 | 2012-04-25 | 无锡威孚精密机械制造有限责任公司 | Constant power valve |
| CN102425541B (en) * | 2011-12-20 | 2013-12-04 | 无锡威孚精密机械制造有限责任公司 | Constant power valve |
| CN104454489A (en) * | 2014-12-04 | 2015-03-25 | 中航力源液压股份有限公司 | Integrated compact type constant power variable device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120905 Effective date of abandoning: 20131204 |
|
| RGAV | Abandon patent right to avoid regrant |