WO1999017021A1 - Machine hydraulique a pistons radiaux et a cylindree variable - Google Patents

Machine hydraulique a pistons radiaux et a cylindree variable Download PDF

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Publication number
WO1999017021A1
WO1999017021A1 PCT/IT1998/000256 IT9800256W WO9917021A1 WO 1999017021 A1 WO1999017021 A1 WO 1999017021A1 IT 9800256 W IT9800256 W IT 9800256W WO 9917021 A1 WO9917021 A1 WO 9917021A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic machine
screw
crank
transmission
previous
Prior art date
Application number
PCT/IT1998/000256
Other languages
English (en)
Italian (it)
Inventor
Gabriele Pecorari
Original Assignee
S.A.I. Societa' Apparecchiature Idrauliche S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from ITMO970167 external-priority patent/IT1295609B1/it
Priority claimed from IT97MO000203 external-priority patent/IT1296756B1/it
Application filed by S.A.I. Societa' Apparecchiature Idrauliche S.P.A. filed Critical S.A.I. Societa' Apparecchiature Idrauliche S.P.A.
Publication of WO1999017021A1 publication Critical patent/WO1999017021A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F04B49/125—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft

Definitions

  • the invention concerns : a hydraulic machine with radial pistons and variable displacement , that is, an hydraulic motor with pistons arranged radially on a single crank, of the type with the group of cylinders in fixed position with respect to the stator, having a device to vary of the displacement; the said motor may operate as a pump both in a closed circuit and in an open circuit.
  • the state of the art comprises hydraulic motors with radial cylinders that can operate with two or three displacements . They are equipped with crank and radially mo- bile eccentric actuated by double acting hydraulic cylinder inside the crank: the complete retraction of said cylinder retracts the crank to its minimim eccentricity, thereby setting the motor at its minimum displacement; on the other hand, the complete extension of the crank ex- tends to its maximum eccentricity, thereby setting the motor at its maximum displacement .
  • variable displacement motors have considerable disadvantages due to the difficulty in adjusting the displacement to just two values; furthermore, they are difficult to manufacture owing to the sizing of the cylinder inside the crank and its actuation, in that it needs at a higher pressure than the inlet system pressure or to have a much larger area in order to counteract the forces stressing the crank.
  • a first mechanical device included an element which expands radially within one of the two chambers of the said internal cylinder so as to limit its stroke. This solu- tion, however, proved to be unreliable owing to the uncertain positioning of the radial expansion element, making it unusable. It appears that is no longer manufactured.
  • a second electronic device uses a proportional CVM hy- draulic valve to control the said cylinder inside the crank, therby continously controlling the displacement at all times during operation.
  • plastic presses only require that the displacement of the hydraulic motor be adjusted when setting up a new production run, and until the press has to be set up for a different part the displacement of the motor does not need to be changed.
  • the said electronic device for controlling the variation of the displacement, if used on plastic presses, is extremely costly and does not make the most of the particular capabilities of the continuous control of the displacement.
  • the prior art comprises radial piston hydraulic pumps with variable displacement, in which the eccentrici- ty is achived by moving in a radial direction the external ring on which the sliding shoes of each piston slides, whereas the cylinders rotate in unison with the drive shaft: such an arrangement is only advantageous for pumps, but may not be applied to motors owing to the geometry of the forces produced in generating the output torque .
  • an hy- draulic machine with radial pistons and variable displacement comprising a stator within which rotates a crankshaft, with crank having mobile eccentric ring in the direction of the throw, means of positioning of said eccentric ring, a series of cylinders and corresponding pistons acting on the crank through sliding shoes constrained by rings concentric to it, and said means of positioning consisting of a screw positioned on the axis of the throw coupled to an internal thread fashioned in the throw of the shaft; furthermore, it is equipped with transmission to the screw from the outside the stator.
  • the invention shows: said transmission to the screw consisting of cogwheels .
  • said cogwheels have helical toothing and an intermediate wheel with skew axis with regard to the direction of the throw and of the drive shaft.
  • said transmission from the outside is equipped with a reference disk indicating the position of the crank and an external control crank imparting transmission to the screw.
  • the invention shows: said transmission, downstream of the cogwheels , consisting of an axial pin coupled rotationally to one or more sleeves with contrate teeth, with a locking device between pin and sleeves .
  • the invention shows: said transmission, consisting of an axial pin coupled rotationally to at least one sleeve with contrate teeth, driven by a mechanism mounted on on said axial pin and on said sleeve.
  • the invention shows: the mechanism for driving said transmission to the screw consisting of an electric motor.
  • the radial piston hydraulic motor with screw gear for varying the displacement is simple to manufacture and reliable; the operator of the plastic press may, when changing the part being produced, adjust the displacement of the hy- draulic motor to the desired value to obtain the maximum efficency of the injection. Furthermore, inmost cases this means that the press makes the hydraulic motor operate at constant pressure, enabling a considerable reduction of noise levels, owing to a more effective control of the pressure reversals of the fluid in the tubes and the cylinders.
  • the adjusting of the displacement is continuous, and stepped only owing to the need to lock the external crank to the reference disk; whereas with a drive motor, advantageously electric, the angular position of the axial pin, and therefore the radial posi- tion of the mobile eccentric ring may be adjusted as desired, so as to achieve continuous adjusting between the minimum and maximum values of the displacement.
  • the same hydraulic machine may operate both as motor and as pump, owing to the well known reversibility of the volumetric machines, with the possibility of operating both in closed circuits and open circuits, that is, with the intake directly from the tank and without auxiliary charge pumps .
  • FIG. 1 is the partial longitudinal cross-section of a radial piston motor/pump having the device for varying the displacement ;
  • FIG. 2 is enlarged the B-B section of Figure 1, showing the part of the drive shaft with the control mechanism;
  • - Figure 3 is section A-A of Figure 1, reduced for show the radial pistons and the crank with mobile eccentric ring.
  • the indications are as follows: 22, an helical gear wheel, skewed at right angles to said axis of rotation R of the motor and to said axis of rotation V of the helical gear wheel 10: it rotates in the throw that form said crank 18 and is coupled to said wheel 10; 23, a helical toothed pinion mounted on the axis of rotation R of the motor: it is coupled to the said helical gear wheel 22 and is supported anteriorly by the babbitt bush 24; 25, an axial pin keyed, on one side, on the helical pinion 23 and, on the other, on an external crank 26, which can be folded down after cranking the mechanism; 27, the distributor of the hydraulic fluid to the ducts 28, rotating inside the housing 29 and operated in synchronous rotation by the drive shaft 1, by means a toothed sleeve 30 and the puller 31 coupled the end of the shaft 1 opposite to that of the drive with spline couplings 32.
  • the indications are as follows: 33, a toothed indicator sleeve coupled to the said distributor 27 and pro- truding from the housing 29 near said external crank 26; 34, a reference disk, keyed on said indicator sleeve 33, indicating the momentary position of the crank 18; 35, a coaxial support with seals retaining the hydraulic fluid of the said sleeve 33 and of the said axial pin 25, in the crossing of the external wall of the housing 29 of the distributor 27.
  • the indications are as follows: 36, Figure 2, the walls coupling said eccentric ring 8 with the corre- sponding surface 20; 37, the hole transverse to the crank 18 within which is located said helical gear wheel 22, supported by bearings 38: the said hole is plugged by plug 39; C, the run in direction of the V axis of radial traverse of the ring 8; E, Figure 3, the eccentricity of the crank 18, sum of I eccentricities of the surfaces 20 and of said run C .
  • the operation of the hydraulic machine with radial pistons and variable displacement take place in the following way.
  • the reference disk 34 keyed and dragged by the indicator sleeve 33, is also set in synchronous motion, as is the external crank 26 directly keyed onto the axial pin 25, in turn keyed onto the helical pinion 22.
  • the integral motion between the external crank and the reference disk takes place precisely on account of the constancy of the position of the said ring 8 and indicates the position of the crank 18, by means of the reference disk.
  • the external crank 26, in the folded position, and the disk 34 are protected by a casing, not shown, to avoid accidents to the user.
  • the user halts the motor and oper- ates manually by rotating the external crank 26 in order to modify at will the eccentricity of the said mobile eccentric ring 8, thus varying the displacement value.
  • the motion imparted to the external crank 26, by means the axial pin 25, is transmitted to the helical pinion 23, which, in presence of the normal resisting torque applied the drive shaft 1, rotates and transmits the rotation to the helical gear wheel 22.
  • the said helical gear wheel in turn transmits the motion to the helical gear wheel 10 to which is coupled: in this way the axial rotation of the external crank is transformed into rotation of the helical gear wheel and by means of the two threaded bushes 12, keyed at its extremities 11 and coupled to the internal thread 19, causes the mobile eccentric ring 8 to traverse along the V axis of the said gear wheel 10 to the desired value.
  • the overall metallic contact between the surfaces 13 of the ring 8 and the bushes 12 and extremity 11 of the screw, is mainteined by the pads 14, realized in different material so as to avoid the welding due to creeping "fritting" .
  • the rotation of the axial pin 25 with regard to the drive shaft can thus be effected with the hydraulic machine in motion, since the electric motor is fed by means of slip- rings contacts . 5
  • the electric motor governing the rotation of the axial pin 25 can be replaced by an hydraulic motor likewise operated with a rotating manifold .
  • Tests indicate that the helical toothing of the pinion 23 and of the wheels 22 and 10 is advantageously inclined at 10 45 degrees .
  • the figures illustrate a radial piston hydraulic mo- 20 tor/pump of the type with oscillating cylinders 4, that is, without connecting rod.
  • the present invention could be applied, with the same results, to the hydraulic motors/pumps with cylinders fixed to the stator and with connecting rods between the pistons and the crank 18. 25
  • variable- displacement helical gear device is driven.
  • rotation for the purpose of varying the displacement, could be scheduled only at the time of construction or by technical intervention when varying the 35 use of the motor/pump: it s equipped with the device for varying displacement, according to this invention, set at predetermined fixed displacement, to avoid tampering by unauthorised personnel .
  • rotation of the external crank 26 could tale place without intermediate positions, the screw device governing the mobile eccentric ring 8 only regulating the machine to maximum or minimum displacement .
  • the reference disk 34 could be a subdivided into toothed sectors for the mounting of the said external crank 26 to allow precise rotation through segments of a circle.
  • the block between the said reference disk 34 and the external crank 26 could be effected with a clutch mechanism, thereby obviating the need to respect predeterminet- ed subdivisions as described above, and allowing continuous variation of displacement.
  • the driving of the axial pin 25 could be actuated, with the hydraulic machine in motion, by means a differential gearing, or epicycliclic gear train, connected to the said pin and to the sleeve 33 and operated manually from outside its housing; the rotation of the drive shaft 1 provides the drive to modify the reciprocal angle between the pin and the sleeve; inversion of the drive could be achived with the use of at least one idle gear.
  • Said gearing could be realized with friction wheels instead of cogwheels .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
  • Transmission Devices (AREA)

Abstract

Cette machine hydraulique à pistons radiaux et à cylindrée variable comprend un stator (2) à l'intérieur duquel tourne un arbre coudé (1) avec une manivelle (18) ayant un anneau excentrique (8) pouvant se déplacer dans la direction du rayon de manivelle (V), un moyen de positionnement de cet anneau excentrique, une série de cylindres (4) et des pistons correspondants (5) agissant sur la manivelle, ledit moyen de positionnement se composant d'une vis (12; 11; 10) située sur l'axe du rayon de manivelle (V) et couplée à un filetage interne (19) ménagé dans le coude de l'arbre (1); la vis est en outre entraînée de l'extérieur du stator au moyen d'une transmission (25) constituée par des roues dentées hélicoïdales (10; 22; 23), avec une roue intermédiaire à axe oblique (22) par rapport à la direction du rayon de manivelle (V) et par rapport à la direction de l'axe de l'arbre moteur (R). Cette machine hydraulique peut fonctionner à la fois comme moteur et comme pompe en circuit ouvert ou en circuit fermé.
PCT/IT1998/000256 1997-09-29 1998-09-29 Machine hydraulique a pistons radiaux et a cylindree variable WO1999017021A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITMO97A000167 1997-09-29
ITMO970167 IT1295609B1 (it) 1997-09-29 1997-09-29 Motore idraulico a pistoni radiali e cilindrata variabile.
IT97MO000203 IT1296756B1 (it) 1997-11-12 1997-11-12 Macchina idraulica a pistoni radiali e cilindrata variabile.
ITMO97A000203 1997-11-12

Publications (1)

Publication Number Publication Date
WO1999017021A1 true WO1999017021A1 (fr) 1999-04-08

Family

ID=26331738

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1998/000256 WO1999017021A1 (fr) 1997-09-29 1998-09-29 Machine hydraulique a pistons radiaux et a cylindree variable

Country Status (2)

Country Link
CN (1) CN1097166C (fr)
WO (1) WO1999017021A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023630A1 (de) * 2004-05-10 2005-12-08 Zf Friedrichshafen Ag Antrieb für ein Mobilfahrzeug
DE102004023631A1 (de) * 2004-05-10 2005-12-08 Zf Friedrichshafen Ag Antrieb für Mobilfahrzeuge
DE102004023628A1 (de) * 2004-05-10 2005-12-08 Zf Friedrichshafen Ag Hydraulischer Antrieb für Mobilfahrzeuge
DE102004048174A1 (de) * 2004-10-02 2006-04-06 Zf Friedrichshafen Ag Einrichtung zur Bestimmung des Schluckvolumens eines verstellbaren Radialkolbenmotors
US7082760B2 (en) 2004-06-29 2006-08-01 Zf Friedrichshafen Ag Drive system for mobile vehicles
US7201702B2 (en) 2004-08-02 2007-04-10 Zf Friedrichshafen Ag Drive mechanism for a mobile vehicle
US7243755B2 (en) 2004-07-28 2007-07-17 Zf Friedrichshafen Ag Drive mechanism for a mobile vehicle
WO2007122644A1 (fr) * 2006-04-20 2007-11-01 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Moteur hydraulique à cylindres radiaux
WO2007122643A1 (fr) * 2006-04-20 2007-11-01 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Moteur hydraulique à cylindres radiaux et déplacement variable continu
US7299891B2 (en) 2004-08-02 2007-11-27 Zf Friedrichshafen Ag Hydraulic drive mechanism for mobile vehicles
EP1900971A1 (fr) * 2006-09-14 2008-03-19 ZF Friedrichshafen AG Engrenage hydrostatique-mécanique
WO2011082890A3 (fr) * 2009-12-17 2011-11-10 Zf Friedrichshafen Ag Procédé pour déterminer le volume absorbé par une machine à pistons radiaux
CN102878011A (zh) * 2012-09-07 2013-01-16 徐州万邦道路工程装备服务股份公司 一种稳定土拌合机转子马达的二次冲刷装置
US8382449B2 (en) 2004-06-30 2013-02-26 S.A.I. Societa' Apparecchiature Idrauliche Spa Fluid machine with radial cylinders
FR3012860A1 (fr) * 2013-11-04 2015-05-08 Poclain Hydraulics Ind Ensemble formant une machine hydraulique a pistons radiaux comprenant un carter optimise
CN104612927A (zh) * 2014-12-26 2015-05-13 东莞光洋信息科技有限公司 中央液压泵及其驱动机构
DE102006033127B4 (de) * 2006-07-18 2016-01-07 Zf Friedrichshafen Ag Hydrostatisch-mechanisches Getriebe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102345554B (zh) * 2006-04-20 2014-05-07 S.A.I会水利设备股份公司 星形缸体液压马达
CA2866734C (fr) * 2006-06-08 2017-05-02 Larry Alvin Schuetzle Compresseur ou pompe alternatifs et systeme d'entrainement d'outil portatif comprenant un compresseur alternatif
CN103758690A (zh) * 2013-10-14 2014-04-30 詹永显 滚动摩擦的摆缸液压马达
DE102018108638B3 (de) * 2018-04-11 2019-05-16 Hoerbiger Automatisierungstechnik Holding Gmbh Hydrauliksystem

Citations (4)

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Publication number Priority date Publication date Assignee Title
US1989118A (en) * 1930-03-22 1935-01-29 Ernest J Svenson Adjustable rotary mechanism
US2504041A (en) * 1946-11-19 1950-04-11 Acrotorque Co Hydraulic pump unit
US3771423A (en) * 1972-06-01 1973-11-13 Tobias J Radial pump or motor with stabilized pintle
GB2041143A (en) * 1979-01-30 1980-09-03 Bran & Luebbe Stroke adjustment mechanism for reciprocating positive displacement pumps

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19513987C2 (de) * 1995-04-13 1998-10-08 Bosch Gmbh Robert Verstellbare, hydrostatische Radialkolbenmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1989118A (en) * 1930-03-22 1935-01-29 Ernest J Svenson Adjustable rotary mechanism
US2504041A (en) * 1946-11-19 1950-04-11 Acrotorque Co Hydraulic pump unit
US3771423A (en) * 1972-06-01 1973-11-13 Tobias J Radial pump or motor with stabilized pintle
GB2041143A (en) * 1979-01-30 1980-09-03 Bran & Luebbe Stroke adjustment mechanism for reciprocating positive displacement pumps

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023631A1 (de) * 2004-05-10 2005-12-08 Zf Friedrichshafen Ag Antrieb für Mobilfahrzeuge
DE102004023628A1 (de) * 2004-05-10 2005-12-08 Zf Friedrichshafen Ag Hydraulischer Antrieb für Mobilfahrzeuge
DE102004023630A1 (de) * 2004-05-10 2005-12-08 Zf Friedrichshafen Ag Antrieb für ein Mobilfahrzeug
US7082760B2 (en) 2004-06-29 2006-08-01 Zf Friedrichshafen Ag Drive system for mobile vehicles
US8382449B2 (en) 2004-06-30 2013-02-26 S.A.I. Societa' Apparecchiature Idrauliche Spa Fluid machine with radial cylinders
US7243755B2 (en) 2004-07-28 2007-07-17 Zf Friedrichshafen Ag Drive mechanism for a mobile vehicle
US7299891B2 (en) 2004-08-02 2007-11-27 Zf Friedrichshafen Ag Hydraulic drive mechanism for mobile vehicles
US7201702B2 (en) 2004-08-02 2007-04-10 Zf Friedrichshafen Ag Drive mechanism for a mobile vehicle
DE102004048174A1 (de) * 2004-10-02 2006-04-06 Zf Friedrichshafen Ag Einrichtung zur Bestimmung des Schluckvolumens eines verstellbaren Radialkolbenmotors
EP2249026A2 (fr) 2006-04-20 2010-11-10 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Moteur hydraulique doté de cylindres radiaux
US8206130B2 (en) 2006-04-20 2012-06-26 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Hydraulic motor having radial cylinders capable of high speed rotation
JP2009534576A (ja) * 2006-04-20 2009-09-24 エッセ ア イ ソチエタ アッパレッキアトゥーレ イドゥラウリケ ソチエタ ペル アツィオーニ ラジアルシリンダ油圧モータ
WO2007122643A1 (fr) * 2006-04-20 2007-11-01 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Moteur hydraulique à cylindres radiaux et déplacement variable continu
EP2249026A3 (fr) * 2006-04-20 2011-02-09 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Moteur hydraulique doté de cylindres radiaux
WO2007122644A1 (fr) * 2006-04-20 2007-11-01 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Moteur hydraulique à cylindres radiaux
JP4842372B2 (ja) * 2006-04-20 2011-12-21 エッセ ア イ ソチエタ アッパレッキアトゥーレ イドゥラウリケ ソチエタ ペル アツィオーニ 押し除け量が連続可変であるラジアルシリンダ液圧モータ
US8235680B2 (en) 2006-04-20 2012-08-07 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. Hydraulic motor having radial cylinders and continuous variable displacement
DE102006033127B4 (de) * 2006-07-18 2016-01-07 Zf Friedrichshafen Ag Hydrostatisch-mechanisches Getriebe
EP1900971A1 (fr) * 2006-09-14 2008-03-19 ZF Friedrichshafen AG Engrenage hydrostatique-mécanique
WO2011082890A3 (fr) * 2009-12-17 2011-11-10 Zf Friedrichshafen Ag Procédé pour déterminer le volume absorbé par une machine à pistons radiaux
US9115711B2 (en) 2009-12-17 2015-08-25 Zf Friedrichshafen, Ag Method for determining the displacement of a radial piston machine
CN102878011A (zh) * 2012-09-07 2013-01-16 徐州万邦道路工程装备服务股份公司 一种稳定土拌合机转子马达的二次冲刷装置
FR3012860A1 (fr) * 2013-11-04 2015-05-08 Poclain Hydraulics Ind Ensemble formant une machine hydraulique a pistons radiaux comprenant un carter optimise
CN104613155A (zh) * 2013-11-04 2015-05-13 波克兰液压工业设备公司 形成包括优化壳体的径向活塞液压机的组件
CN104612927A (zh) * 2014-12-26 2015-05-13 东莞光洋信息科技有限公司 中央液压泵及其驱动机构

Also Published As

Publication number Publication date
CN1097166C (zh) 2002-12-25
CN1278891A (zh) 2001-01-03

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