CN101398019A - Hydraulic control method and device for rotating speed of hydraulic motor - Google Patents
Hydraulic control method and device for rotating speed of hydraulic motor Download PDFInfo
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- CN101398019A CN101398019A CNA2007102019356A CN200710201935A CN101398019A CN 101398019 A CN101398019 A CN 101398019A CN A2007102019356 A CNA2007102019356 A CN A2007102019356A CN 200710201935 A CN200710201935 A CN 200710201935A CN 101398019 A CN101398019 A CN 101398019A
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- 239000003921 oil Substances 0.000 claims description 99
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- 239000012530 fluid Substances 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 3
- 239000010727 cylinder oil Substances 0.000 claims description 2
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- 230000001276 controlling effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
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- 230000009977 dual effect Effects 0.000 description 1
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Abstract
The invention discloses a hydraulic motor rotating speed hydraulic control method and device. The method utilizes the external control oil pressure to control the on and off of the oil passages of the large cavity and the small cavity of the variable cylinder of the motor through a rotating speed hydraulic control valve so as to achieve the aim of adjusting the rotating speed and the torque of the hydraulic motor; when the rotating speed of the hydraulic motor is lower than or equal to a set value, an oil way leading to the large cavity is cut off, and the hydraulic motor is in a large displacement and maximum torque state; when the rotating speed of the hydraulic motor is higher than a set value and not higher than a rated value, the large cavity oil way is communicated by the rotating speed hydraulic control valve, and the displacement and the torque of the hydraulic motor are gradually reduced; when the rotating speed of the hydraulic motor exceeds the rated rotating speed, the oil pressure of an oil inlet of the hydraulic motor is increased, the large cavity oil way is cut off by the rotating speed hydraulic control valve, and the displacement and the torque of the hydraulic motor are gradually increased. The invention meets the self-adaptive capacity requirement of the hydraulic driving system of the engineering traction vehicle.
Description
Technical field
The present invention relates to a kind of hydraulic control system, particularly belong to a kind of hydraulic control method of hydraulic motor rotating speed and device thereof.
Background technique
The traction fluid pressing system of engineering vehicle (machinery) is to the requirement of motor, and the one, should make the most of time services of motor and hydraulic system in the higher mesohigh scope of efficient, the ability to work of element is given full play to, cost is suitable and enough life-spans are arranged; The 2nd, should make motor and vehicle that load variations is had adaptive ability, high speed operation is to improve the work production rate during little load, tick-over is to improve tractive force during big the load, be that driver for vehicle is regulated the speed of travel automatically according to the variation of external load and adapted to it, the limited power adaptation external load in a big way of motor is changed, and power fully uses and non-overloading.
At present, normally used oil hydraulic motor Variable Control mode mainly contains in the domestic vehicle traction: the compound controlled variable dual mode of HA high pressure automatic variable and high pressure and hydraulic control pilot pressure, HA high pressure automatic variable need not other controlling units, and is easy to be reliable, easy to use; Motor displacement changes automatically with load, has and the similar service behaviour of torque-converters.Its shortcoming is that motor displacement is determined by load pressure, when operating mode very low in mean load and that fluctuation is bigger is worked, and the anti-fluctuation of load ability of motor, the work utmost point is not steady.And high pressure and the compound controlled variable of hydraulic control pilot pressure can artificially be controlled car speed, and vehicle performance is regulated as required, remedy the shortcoming of single HA control to the special operation condition bad adaptability, and its shortcoming is to increase the people for controlling.More than two kinds of methods all exist inevitable defective, along with the continuous progress and the development of a combat engineer tractor hydraulic driving system, the requirement of the variable displacement motor that is adjusted to basic demand with self adaption is also constantly being improved and perfect.
Summary of the invention
The objective of the invention is to: a kind of hydraulic control method of hydraulic motor rotating speed and device thereof are provided.Satisfy the demand of a domestic combat engineer tractor hydraulic driving system adaptive ability.
Technological scheme of the present invention.Hydraulic control method of hydraulic motor rotating speed is characterized in that: this method is to utilize the external control oil pressure to reach the rotating speed of adjustment oil hydraulic motor and the purpose of moment of torsion through the switching of the large and small chamber of rotating speed hydraulic control valve control motor variable cylinder oil circuit; When the rotating speed of oil hydraulic motor was less than or equal to setting value, the oil circuit in the big chamber of variable piston cylinder was cut off, and oil hydraulic motor is in big discharge capacity and Maximum Torque state; When the rotating speed of oil hydraulic motor was higher than setting value and is not more than rating value, big chamber oil circuit was connected by the rotating speed hydraulic control valve, and the discharge capacity and the moment of torsion of oil hydraulic motor reduce gradually; When the rotating speed of oil hydraulic motor surpassed rated speed, the oil pressure of oil hydraulic motor filler opening raise, and big chamber oil circuit is cut off by the rotating speed hydraulic control valve, and the discharge capacity and the moment of torsion of oil hydraulic motor increase gradually.
In the above-mentioned hydraulic control method of hydraulic motor rotating speed, described external control oil pressure is from the inclined disc type variable displacement pump that is applicable to closed circuit that has the rotating speed hydraulic control that is connected with motor.
In the aforesaid hydraulic control method of hydraulic motor rotating speed, the induction of described rotating speed hydraulic control valve is from the oil pressure of oil hydraulic motor import, and when oil pressure during greater than setting value, oil circuit conducting, when oil pressure was less than or equal to setting value, oil circuit cut off.
In the aforesaid hydraulic control method of hydraulic motor rotating speed, described motor variable cylinder comprises cylinder body, piston and driving lever, and driving lever is connected with piston, and piston is arranged in cylinder body, piston is separated into big chamber and loculus with cylinder body, and big chamber has oil circuit to be connected with the rotating speed hydraulic control valve respectively with loculus.
According to the oil hydraulic motor rotating speed hydraulic control unit that aforesaid hydraulic control method of hydraulic motor rotating speed constitutes, it comprises governor body 1 and end cap assembly parts 2, and end cap assembly parts 2 and governor body 1 are connected through screw; Be provided with rotating speed hydraulic control valve 3 in the governor body 1, one end of rotating speed hydraulic control valve 3 is connected with spring 5 through spring seat 4, the other end of spring 5 is connected with guide rod 6 through spring seat 4, the other end of guide rod 6 is connected with adjustment screw rod 7, adjust screw rod 7 and stretch out outside the governor body 1, the adjustment screw rod 7 that exposes outside the governor body 1 is provided with locking nut 8.
In the above-mentioned oil hydraulic motor rotating speed hydraulic control unit, described rotating speed hydraulic control valve 3 comprises valve body 9 and spool 10, and valve body 9 is through in the spool 10, and valve body 9 is provided with oil guide slot 11, and spool 10 is provided with oilhole 12.
In the aforesaid oil hydraulic motor rotating speed hydraulic control unit, be provided with rotating speed hydraulic control valve gap 30 and control guiding valve 13 in the described end cap assembly parts 2.
In the aforesaid oil hydraulic motor rotating speed hydraulic control unit, described control guiding valve 13 is provided with oil groove 14.
In the aforesaid oil hydraulic motor rotating speed hydraulic control unit, be provided with in described governor body 1 and the end cap assembly parts 2 and the corresponding oil circuit 15 of hydraulic principle, the port of oil circuit 15 is respectively equipped with forward pilot pressure interface 16 and reverse pilot pressure interface 17, and forward pilot pressure interface 16 and reverse pilot pressure interface 17 are provided with lock nut 18.
In the aforesaid oil hydraulic motor rotating speed hydraulic control unit, also be provided with return opening 28 and aux. pressure hydraulic fluid port 29 on the described governor body 1.
Compared with prior art, the present invention is to provide the motor of hydraulic control method of hydraulic motor rotating speed and band rotating speed hydraulic control variable (being called for short DA control) device.The present invention has satisfied the demand of a combat engineer tractor hydraulic driving system adaptive ability.The present invention can and the vehicle hydraulic drive system in motor, the parameter between the volume adjustable hydraulic pump carry out parameter matching and carry out control interactive, realize the self adaptive control of towing vehicle.Be that driver for vehicle is regulated the speed of travel automatically according to the variation of external load and adapted to it, make the power of motor adapt to the variation of external load in a big way, power is made full use of and non-overloading.The acceleration, adaptivity, work production rate, the fuel economy that guarantee vehicle simultaneously all are not fully exerted.
Motor mates as vehicle towed closed system with the inclined disc type variable displacement pump that is applicable to closed circuit (being called for short the A4VG pump), by coming from the guide pilot pressure of the A4VG pump pilot pressure relevant as the motor variable with rotating speed, this pressure and working pressure form compound pilot pressure in the mode of weighting summation, make motor adapt to bigger outer load variations with less pressure range, thereby stablize the operation point of pump and motor, make it to bring into play best power character and Economy.
When the motor speedup, outside load when constant, under the mating reaction of motor and band rotating speed hydraulic control (being called for short DA control) variable device pump, can make the engine target coincidence rate increase and increase fast with rotating speed, be elevated near the dreamboat value.
Motor DA control constitutes the infinitely variable speed transmission of control automatically with pump DA control, and its output characteristics is only by the engine oil gate control.The rational Match of motor and pump work point can make acceleration, adaptivity, work production rate, the fuel economy of vehicle be not fully exerted.
Description of drawings
Accompanying drawing 1 is a hydraulic schematic diagram of the present invention;
Accompanying drawing 2 is structural representations of the present invention;
Accompanying drawing 3 is partial enlarged drawings of accompanying drawing 2;
Accompanying drawing 4 is A-A sectional views of accompanying drawing 2.
Sign flag in the accompanying drawing is: 1-governor body, 2-end cap assembly parts, 3-rotating speed hydraulic control valve, the 4-spring seat, 5-spring, 6-guide rod, 7-adjusts screw rod, 8-locking nut, 9-valve body, the 10-spool, 11-oil guide slot, 12-oilhole, 13-controls guiding valve, 14-oil groove, 15-oil circuit, 16-forward external control pressure interface, the reverse external control pressure interface of 17-, 18-lock nut, 19-motor variable cylinder, the big chamber of 20-, 21-oil hydraulic motor, the 22-cylinder body, 23-piston, 24-driving lever, the 25-loculus, 26-motor filler opening (being oil outlet during counter-rotating), the oil outlet of 27-motor (being filler opening during counter-rotating), the 28-return opening, 29-auxiliary pressure port, 30-rotating speed hydraulic control valve gap.
Embodiment
Embodiment.Hydraulic control method of hydraulic motor rotating speed, the hydraulic principle of this method as shown in Figure 1.Be the rotating speed that utilizes the switching of big chamber 20 and loculus 25 oil circuits in rotating speed hydraulic control valve 3 control motor variable cylinder 19 of external control oil pressure to reach to adjust oil hydraulic motor 21 and the purpose of moment of torsion; When the rotating speed of oil hydraulic motor 21 was less than or equal to setting value, the oil circuit in the big chamber 20 of variable piston cylinder was cut off, and oil hydraulic motor 21 is in big discharge capacity and Maximum Torque state; When the rotating speed of oil hydraulic motor 21 was higher than setting value and is not more than rating value, big chamber 20 oil circuits were connected by rotating speed hydraulic control valve 3, and the discharge capacity and the moment of torsion of oil hydraulic motor 21 reduce gradually; When the rotating speed of oil hydraulic motor 21 surpassed rated speed, the oil pressure of oil hydraulic motor 21 filler openings raise, and big chamber 20 oil circuits are cut off by rotating speed hydraulic control valve 3, and the discharge capacity and the moment of torsion of oil hydraulic motor 21 increase gradually.Described external control oil pressure is from the inclined disc type variable displacement pump that is applicable to closed circuit (being called for short the A4VG pump) that has rotating speed hydraulic control (being called for short DA control) that is connected with motor.3 inductions of described rotating speed hydraulic control valve are from the oil pressure of oil hydraulic motor 21 filler openings, and when the oil pressure of filler opening during greater than setting value, oil circuit conducting, when oil pressure was less than or equal to setting value, oil circuit cut off.Described motor variable cylinder 19 comprises cylinder body 22, piston 23 and driving lever 24, driving lever 24 is connected with piston 23, piston 23 is arranged in cylinder body 22, and piston 23 is separated into big chamber 20 and loculus 25 with cylinder body 22, and big chamber 20 has oil circuit to be connected with rotating speed hydraulic control valve 3 respectively with loculus 25.Also be provided with return opening 28 and aux. pressure hydraulic fluid port 29 on the described governor body 1.
According to the oil hydraulic motor rotating speed hydraulic control unit of above-mentioned hydraulic control method of hydraulic motor rotating speed formation, as Fig. 2, Fig. 3 and shown in Figure 4.This device comprises governor body 1 and end cap assembly parts 2, and end cap assembly parts 2 and governor body 1 are connected through screw; Be provided with rotating speed hydraulic control valve 3 in the governor body 1, one end of rotating speed hydraulic control valve 3 is connected with spring 5 through spring seat 4, the other end of spring 5 is connected with guide rod 6 through spring seat 4, the other end of guide rod 6 is connected with adjustment screw rod 7, adjust screw rod 7 and stretch out outside the governor body 1, the adjustment screw rod 7 that exposes outside the governor body 1 is provided with locking nut 8.Described rotating speed hydraulic control valve 3 comprises valve body 9 and spool 10, and valve body 9 is through in the spool 10, and valve body 9 is provided with oil guide slot 11, and spool 10 is provided with oilhole 12.Be provided with rotating speed hydraulic control valve gap 30 and control guiding valve 13 in the described end cap assembly parts 2.Described control guiding valve 13 is provided with oil groove 14.Be provided with hydraulic principle corresponding in described governor body 1 and the end cap assembly parts 2, the port of oil circuit 15 is respectively equipped with forward pilot pressure interface 16 and reverse pilot pressure interface 17, and forward pilot pressure interface 16 and reverse pilot pressure interface 17 are provided with lock nut 18.
Working principle of the present invention
The motor operations principle that constitutes with method of the present invention as shown in Figure 1.Forward external control pressure interface 16 or 17 reverse external control pressure interfaces are responded to the A4VG pump pilot pressure P relevant with engine speed that carries DA control
St, the introducing of forward external control pressure interface 16 or reverse external control pressure interface 17 is decided on the vehicle to run direction.
When motor was started working, the A4VG pump began variable with the raising of engine speed, simultaneously its pilot pressure P
StAlso increase, promotion control guiding valve 13 (or right) left moves, and reaches the rotational speed N that system sets in engine speed
dThe time, forward external control pressure interface 16 or oppositely external control pressure interface 17 pressure oils still can not overcome rotating speed hydraulic control spool 10 suffered spring force and inlet pressure, because the loculus 25 normal open high pressure of motor variable cylinder 19, the oil duct in big chamber 20 is closed, make the piston 23 in the motor variable cylinder 19 still be in the home position, promptly motor is in big displacement condition (moment of torsion maximum); When engine speed continues to be increased to N
MmaxWhen (rotating speed of the pump of maximum engine torque correspondence), pilot pressure P
StRaise gradually, forward external control pressure interface 16 or oppositely external control pressure interface 17 pressure oils overcome rotating speed hydraulic control spool 10 suffered spring force and inlet pressure, machinery is mobile left to make rotating speed hydraulic control valve 3, big chamber 20 in the motor variable cylinder 19 communicates with the high pressure oil of motor inlet 26 or 27 with loculus 25 simultaneously, because motor variable cylinder 19 big or small cavity areas are poor, thereby piston 23 is moved to the left, and order about motor displacement and reduce, moment of torsion reduces, and rotating speed increases; Motor is at N
Mmax～N
dWhen working between (rotating speed of the pump of engine power rating correspondence), the motor speed governing is finished by engine speed change.
According to the characteristics of rotating speed hydraulic control spool 10, working pressure P and pilot pressure P
StForm final pilot pressure P with weighted subtraction
k, motor displacement is directly proportional with final pilot pressure.Pilot pressure and working pressure are maintained fixed relation, P
k=P
St/ P=3/100.That is: pilot pressure changes 0.3Mpa (raising or reduction), relevant work pressure is raise or reduction 10Mpa.When working pressure was elevated to the force value that sets above stroking mechanism, rotating speed hydraulic control valve 3 machinery to the right moved, and oil hydraulic motor 21 changes (moment of torsion increases, and rotating speed reduces) to increasing the discharge capacity direction.
Claims (10)
- [claim 1] hydraulic control method of hydraulic motor rotating speed is characterized in that: this method is to utilize the external control oil pressure to reach the rotating speed of adjustment oil hydraulic motor and the purpose of moment of torsion through the switching of the large and small chamber of rotating speed hydraulic control valve control motor variable cylinder oil circuit; When the rotating speed of oil hydraulic motor was less than or equal to setting value, the oil circuit in the big chamber of variable piston cylinder was cut off, and oil hydraulic motor is in big discharge capacity and Maximum Torque state; When the rotating speed of oil hydraulic motor was higher than setting value and is not more than rating value, big chamber oil circuit was connected by the rotating speed hydraulic control valve, and the discharge capacity and the moment of torsion of oil hydraulic motor reduce gradually; When the rotating speed of oil hydraulic motor surpassed rated speed, the oil pressure of oil hydraulic motor filler opening raise, and big chamber oil circuit is cut off by the rotating speed hydraulic control valve, and the discharge capacity and the moment of torsion of oil hydraulic motor increase gradually.
- [claim 2] hydraulic control method of hydraulic motor rotating speed according to claim 1 is characterized in that: described external control oil pressure is from the inclined disc type variable displacement pump that is applicable to closed circuit that has the rotating speed hydraulic control that is connected with motor.
- [claim 3] hydraulic control method of hydraulic motor rotating speed according to claim 1, it is characterized in that: the induction of described rotating speed hydraulic control valve is from the oil pressure of oil hydraulic motor import, when oil pressure during greater than setting value, and the oil circuit conducting, when oil pressure was less than or equal to setting value, oil circuit cut off.
- [claim 4] hydraulic control method of hydraulic motor rotating speed according to claim 1, it is characterized in that: described motor variable cylinder comprises cylinder body, piston and driving lever, driving lever is connected with piston, piston is arranged in cylinder body, piston is separated into big chamber and loculus with cylinder body, and big chamber has oil circuit to be connected with the rotating speed hydraulic control valve respectively with loculus.
- The oil hydraulic motor rotating speed hydraulic control unit that [claim 5] constitutes according to the described hydraulic control method of hydraulic motor rotating speed of the arbitrary claim of claim 1 to 4, it is characterized in that: this device comprises governor body (1) and end cap assembly parts (2), and end cap assembly parts (2) is connected through screw with governor body (1); Be provided with rotating speed hydraulic control valve (3) in the governor body (1), one end of rotating speed hydraulic control valve (3) is connected with spring (5) through spring seat (4), the other end of spring (5) is connected with guide rod (6) through spring seat (4), the other end of guide rod (6) is connected with adjustment screw rod (7), adjust screw rod (7) and stretch out outside the governor body (1), the adjustment screw rod (7) that exposes outside the governor body (1) is provided with locking nut (8).
- [claim 6] oil hydraulic motor rotating speed according to claim 5 hydraulic control unit, it is characterized in that: described rotating speed hydraulic control valve (3) comprises valve body (9) and spool (10), valve body (9) is through in the spool (10), valve body (9) is provided with oil guide slot (11), and spool (10) is provided with oilhole (12).
- [claim 7] oil hydraulic motor rotating speed according to claim 6 hydraulic control unit is characterized in that: be provided with rotating speed hydraulic control valve gap (30) and control guiding valve (13) in the described end cap assembly parts (2).
- [claim 8] oil hydraulic motor rotating speed according to claim 7 hydraulic control unit is characterized in that: described control guiding valve (13) is provided with oil groove (14).
- [claim 9] oil hydraulic motor rotating speed according to claim 8 hydraulic control unit, it is characterized in that: be provided with and the corresponding oil circuit of hydraulic principle (15) in described governor body (1) and the end cap assembly parts (2), the port of oil circuit (15) is respectively equipped with forward pilot pressure interface (16) and reverse pilot pressure interface (17), and forward pilot pressure interface (16) and reverse pilot pressure interface (17) are provided with lock nut (18).
- [claim 10] oil hydraulic motor rotating speed according to claim 9 hydraulic control unit is characterized in that: also be provided with return opening (28) and aux. pressure hydraulic fluid port (29) on the described governor body (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007102019356A CN101398019A (en) | 2007-09-30 | 2007-09-30 | Hydraulic control method and device for rotating speed of hydraulic motor |
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|---|---|---|---|
| CNA2007102019356A CN101398019A (en) | 2007-09-30 | 2007-09-30 | Hydraulic control method and device for rotating speed of hydraulic motor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871477A (en) * | 2010-06-22 | 2010-10-27 | 上海萨澳液压传动有限公司 | Intermediate-pressure control two-position variable axial plunger hydraulic motor |
| CN102788062A (en) * | 2012-08-10 | 2012-11-21 | 中国船舶重工集团公司第七一九研究所 | Rotating speed regulation device used for swash plate operated hydraulic transformer |
| CN102878124A (en) * | 2012-09-21 | 2013-01-16 | 中国船舶重工集团公司第七一九研究所 | Load-sensitive hydraulic transformer |
| CN105134388A (en) * | 2015-08-17 | 2015-12-09 | 北汽福田汽车股份有限公司 | Dual-purpose fuel engine, control method and system thereof, and automobile |
| CN107202047A (en) * | 2017-06-05 | 2017-09-26 | 中国北方车辆研究所 | A kind of conjuncted pump motor swash plate swinging angle control mechanism |
| CN108266421A (en) * | 2017-12-08 | 2018-07-10 | 中国航空工业集团公司成都飞机设计研究所 | A kind of big load high-speed hydraulic motor swash plate adjusting method for aircraft |
| CN108756726A (en) * | 2018-04-23 | 2018-11-06 | 上海中联重科桩工机械有限公司 | Rotary digging drill power head control device |
| CN110043526A (en) * | 2019-04-26 | 2019-07-23 | 燕山大学 | A kind of Direct Action Type overflow motor and its hydraulic pressure circuit |
| CN112555206A (en) * | 2020-12-15 | 2021-03-26 | 潍柴动力股份有限公司 | Hydraulic control system and silage harvester |
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2007
- 2007-09-30 CN CNA2007102019356A patent/CN101398019A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871477A (en) * | 2010-06-22 | 2010-10-27 | 上海萨澳液压传动有限公司 | Intermediate-pressure control two-position variable axial plunger hydraulic motor |
| CN101871477B (en) * | 2010-06-22 | 2012-08-29 | 上海萨澳液压传动有限公司 | Intermediate-pressure control two-position variable axial plunger hydraulic motor |
| CN102788062A (en) * | 2012-08-10 | 2012-11-21 | 中国船舶重工集团公司第七一九研究所 | Rotating speed regulation device used for swash plate operated hydraulic transformer |
| CN102878124A (en) * | 2012-09-21 | 2013-01-16 | 中国船舶重工集团公司第七一九研究所 | Load-sensitive hydraulic transformer |
| CN105134388A (en) * | 2015-08-17 | 2015-12-09 | 北汽福田汽车股份有限公司 | Dual-purpose fuel engine, control method and system thereof, and automobile |
| CN107202047A (en) * | 2017-06-05 | 2017-09-26 | 中国北方车辆研究所 | A kind of conjuncted pump motor swash plate swinging angle control mechanism |
| CN108266421A (en) * | 2017-12-08 | 2018-07-10 | 中国航空工业集团公司成都飞机设计研究所 | A kind of big load high-speed hydraulic motor swash plate adjusting method for aircraft |
| CN108756726A (en) * | 2018-04-23 | 2018-11-06 | 上海中联重科桩工机械有限公司 | Rotary digging drill power head control device |
| CN108756726B (en) * | 2018-04-23 | 2020-01-10 | 上海中联重科桩工机械有限公司 | Power head control device of rotary drilling rig |
| CN110043526A (en) * | 2019-04-26 | 2019-07-23 | 燕山大学 | A kind of Direct Action Type overflow motor and its hydraulic pressure circuit |
| CN112555206A (en) * | 2020-12-15 | 2021-03-26 | 潍柴动力股份有限公司 | Hydraulic control system and silage harvester |
| CN112555206B (en) * | 2020-12-15 | 2023-01-06 | 潍柴动力股份有限公司 | Hydraulic control system and silage harvester |
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Owner name: CNAC LIYUAN HYDRAULIC CO., LTD. Free format text: FORMER OWNER: GUIZHOU LIYUAN HYDRAULIC CO., LTD. Effective date: 20091016 |
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Effective date of registration: 20091016 Address after: Box 99, Guiyang, Guizhou Province, China: 550018 Applicant after: Liyuan Hydraulic Co., Ltd. of Aviation Industry Corporation of China Address before: Box 99, Guiyang, Guizhou Province, China: 550018 Applicant before: Guizhou Liyuan Hydraulic Co., Ltd. |
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Open date: 20090401 |