WO2006054161A1 - Variable-delivery vane pump, in particular for oil - Google Patents

Variable-delivery vane pump, in particular for oil Download PDF

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Publication number
WO2006054161A1
WO2006054161A1 PCT/IB2005/003455 IB2005003455W WO2006054161A1 WO 2006054161 A1 WO2006054161 A1 WO 2006054161A1 IB 2005003455 W IB2005003455 W IB 2005003455W WO 2006054161 A1 WO2006054161 A1 WO 2006054161A1
Authority
WO
WIPO (PCT)
Prior art keywords
axis
rotor
stator
presents
pump according
Prior art date
Application number
PCT/IB2005/003455
Other languages
French (fr)
Inventor
Ennio Ascari
Lorenzo Campani
Original Assignee
H.P.E. High Performance Engineering S.R.L.
Officine Mazzocco Pagnoni S.R.L.
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
Application filed by H.P.E. High Performance Engineering S.R.L., Officine Mazzocco Pagnoni S.R.L. filed Critical H.P.E. High Performance Engineering S.R.L.
Priority to EP05803886A priority Critical patent/EP1812711A1/en
Priority to JP2007542151A priority patent/JP2008520899A/en
Priority to US11/719,734 priority patent/US20090175750A1/en
Publication of WO2006054161A1 publication Critical patent/WO2006054161A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0818—Vane tracking; control therefor
    • F01C21/0827—Vane tracking; control therefor by mechanical means
    • F01C21/0836—Vane tracking; control therefor by mechanical means comprising guiding means, e.g. cams, rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0881—Construction of vanes or vane holders the vanes consisting of two or more parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members

Definitions

  • the present invention relates to a variable delivery vane pump, in particular for oil.
  • the present invention relates to a variable delivery vane pump of the type comprising a rotor, which is mounted to turn about its longitudinal axis, and presents a plurality of outwardly radially open grooves; a stator, which extends around the rotor, and is eccentrically mounted with respect to the rotor itself; a plurality of vanes, each of which is slidingly mounted inside a respective groove, and presents an outer edge facing the stator; and adjusting means for selectively controlling the eccentricity between the rotor and the stator and, therefore, the delivery of the pump.
  • variable delivery vane pumps of the type described above present some drawbacks mainly deriving from the fact that the efficiency of the fluidtight coupling between the vanes and the stator is relatively reduced and decreases rapidly with pump use.
  • variable delivery vane pump in particular for oil, which is free from the aforementioned drawbacks.
  • variable delivery vane pump in particular for oil, as claimed in the attached claims.
  • figure 1 is a schematic longitudinal section of a preferred embodiment of the vane pump of this invention
  • figure 2 is a section taken along line II-II in figure 1
  • figure 3 is a section taken along line III-III in figure 1
  • figures 4 and 5 are two lateral views of two variations of a detail in figures from 1 to 3.
  • variable delivery vane pump in particular for feeding oil to a lubrication circuit (not shown) of an internal combustion engine (not shown) of a vehicle (not shown) .
  • the pump 1 comprises a supporting case 2, which has an essentially parallelepiped shape with an essentially rectangular section, and comprises, in turn, a first plate 3 laterally limited by an essentially flat surface 4.
  • the plate 3 is provided with a cavity 5, which presents a longitudinal axis 6 orthogonal to the surface 4, outwardly opens at the surface 4, and is axially closed by a second plate 7 arranged in contact with the surface 4 itself.
  • the pump 1 also comprises a power shaft 8, which is mounted through the plates 3 and 7 to turn about the axis 6, and carries a keyed cylindrical rotor 9, which is housed inside the cavity 5, and presents a width, parallelly measured to the axis 6, essentially equal to the width of the cavity 5, also parallelly measured to the axis 6.
  • the cavity 5 further houses inside a stator 10, which extends about the rotor 9, presents a width, parallelly measured to the axis 6, essentially equal to the width of the cavity 5 also parallelly measured to the axis 6, and is internally limited by an essentially cylindrical surface 11 arranged in eccentric position with respect to the rotor 9.
  • the stator 10 is hinged to the plate 3 to oscillate, with respect to the plate 3 itself and under the control of an adjusting device 12 of the known type, about a fulcrum axis 13 parallel to the axis 6 and, therefore, allowing to selectively control the eccentricity between the rotor 9 and the surface 11.
  • the rotor 9 presents two cylindrical reciprocally- opposite cavities 14, which are obtained coaxially to the axis 6, and one facing the plate 3 and the other the plate 7, and is provided with a plurality of radial grooves 15 (in the case shown, six grooves 15) , which are obtained through the rotor 9 parallel to the axis 6, are uniformly distributed about the axis 6, radially open outwardly at an outer surface 16 of the rotor 9 coaxially to the axis 6, and further axially open outwardly at the cavities 14.
  • Each groove 15 is slidingly engaged by a vane 17 presenting an outer edge 18, which extends parallel to the axis 6, and is arranged essentially in contact with the surface 11 of the stator 10 by arranging an annular shoe 19 in between.
  • the shoe 19 presents a width, parallelly measured to the axis 6, essentially equal to the width of a vane 17 also parallelly measured to the axis 6, and is circumferentially slidable both to the stator 10, and to the vanes 17.
  • Each vane 17 axially projects from the respective groove 15 inside the cavities 14, and presents an inner edge 20, which extends parallel to the axis 6, and is essentially arranged in contact with two annular elements 21, each of which is accommodated inside one of the cavities 14, extends about the shaft 8, and presents a diameter larger than the diameter of the shaft 8 and smaller than the diameter of the respective cavity 14 so as to float inside the respective cavity 14 itself.
  • Each pair of respectively adjacent vanes 17 circumferentially defines a respective pumping chamber 22, which is further limited radially by the rotor 9 and by the shoe 19 and axially by the plates 3 and 7, is shifted by the rotor 9 about the axis 6 and through a suction inlet 23 and a delivery outlet 24 of the oil, and presents, following the rotation of the rotor 9 about the axis 6 and the eccentricity between the rotor 9 and the surface 11 of the stator 10, a variable volume.
  • each vane 17 comprises a plurality of foils 25 (in the case shown, four foils 25) , which are reciprocally overlapped, and are slidingly radially coupled one to the other to ensure a relatively efficient fluidtight coupling between the vane 17 and the shoe 19.
  • the annular shoe 19 is replaced with a plurality of shoes 26 (in the case shown, three shoes 26) , each of which is arranged between the surface 11 and two respective vanes 17, is slidingly circumferentially coupled to the surface 11 and to the respective vanes 17, and presents two curved ends 27, one of which is essentially arranged in contact with a respective vane 17.
  • the annular shoe 19 is replaced with a single shoe 28, which is arranged between the surface 11 and the vanes 17, extends about the axis 6 according to an angle smaller than 360°, is slidingly circumferentially coupled to the surface 11 and to the vanes 17, and presents two curved ends 29, one of which is essentially arranged in contact with a respective vane 17.
  • the shoes 19, 26, and 28 are housed inside respective cavities, which are obtained in the stator 10, and outwardly open at the surface 11, and outwardly project from the respective cavities to arrange themselves in contact with the respective vanes 17.
  • each shoe 26, 28 are replaced with two enlarged edges parallel to the axis 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

A variable delivery vane pump, in particular for oil, is provided with a stator (10) eccentrically mounted about a rotor (9), which is adapted to turn about one own longitudinal axis (6), and presents a plurality of outwardly radially open grooves (15) and slidingly engaged, each, by a respective vane (17) defined by at least two foils (25) reciprocally overlapped and slidingly coupled one to the other.

Description

VARIABLE DELIVERY VANE PUMP, IN PARTICULAR FOR OIL
TECHNICAL FIELD
The present invention relates to a variable delivery vane pump, in particular for oil.
In particular, the present invention relates to a variable delivery vane pump of the type comprising a rotor, which is mounted to turn about its longitudinal axis, and presents a plurality of outwardly radially open grooves; a stator, which extends around the rotor, and is eccentrically mounted with respect to the rotor itself; a plurality of vanes, each of which is slidingly mounted inside a respective groove, and presents an outer edge facing the stator; and adjusting means for selectively controlling the eccentricity between the rotor and the stator and, therefore, the delivery of the pump.
BACKGROUND ART
The known variable delivery vane pumps of the type described above present some drawbacks mainly deriving from the fact that the efficiency of the fluidtight coupling between the vanes and the stator is relatively reduced and decreases rapidly with pump use. DISCLOSURE OF INVENTION
It is the object of the present invention to provide a variable delivery vane pump, in particular for oil, which is free from the aforementioned drawbacks. According to the present invention, there is provided a variable delivery vane pump, in particular for oil, as claimed in the attached claims.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described with reference to the accompanying drawings illustrating a non-limitative embodiment example thereof, in which: figure 1 is a schematic longitudinal section of a preferred embodiment of the vane pump of this invention; figure 2 is a section taken along line II-II in figure 1; figure 3 is a section taken along line III-III in figure 1; and figures 4 and 5 are two lateral views of two variations of a detail in figures from 1 to 3. BEST MODE FOR CARRYING OUT THE INVENTION With reference to figures from 1 to 3, it is indicated by 1, as a whole, a variable delivery vane pump, in particular for feeding oil to a lubrication circuit (not shown) of an internal combustion engine (not shown) of a vehicle (not shown) .
The pump 1 comprises a supporting case 2, which has an essentially parallelepiped shape with an essentially rectangular section, and comprises, in turn, a first plate 3 laterally limited by an essentially flat surface 4. The plate 3 is provided with a cavity 5, which presents a longitudinal axis 6 orthogonal to the surface 4, outwardly opens at the surface 4, and is axially closed by a second plate 7 arranged in contact with the surface 4 itself.
The pump 1 also comprises a power shaft 8, which is mounted through the plates 3 and 7 to turn about the axis 6, and carries a keyed cylindrical rotor 9, which is housed inside the cavity 5, and presents a width, parallelly measured to the axis 6, essentially equal to the width of the cavity 5, also parallelly measured to the axis 6.
The cavity 5 further houses inside a stator 10, which extends about the rotor 9, presents a width, parallelly measured to the axis 6, essentially equal to the width of the cavity 5 also parallelly measured to the axis 6, and is internally limited by an essentially cylindrical surface 11 arranged in eccentric position with respect to the rotor 9. The stator 10 is hinged to the plate 3 to oscillate, with respect to the plate 3 itself and under the control of an adjusting device 12 of the known type, about a fulcrum axis 13 parallel to the axis 6 and, therefore, allowing to selectively control the eccentricity between the rotor 9 and the surface 11. The rotor 9 presents two cylindrical reciprocally- opposite cavities 14, which are obtained coaxially to the axis 6, and one facing the plate 3 and the other the plate 7, and is provided with a plurality of radial grooves 15 (in the case shown, six grooves 15) , which are obtained through the rotor 9 parallel to the axis 6, are uniformly distributed about the axis 6, radially open outwardly at an outer surface 16 of the rotor 9 coaxially to the axis 6, and further axially open outwardly at the cavities 14.
Each groove 15 is slidingly engaged by a vane 17 presenting an outer edge 18, which extends parallel to the axis 6, and is arranged essentially in contact with the surface 11 of the stator 10 by arranging an annular shoe 19 in between.
The shoe 19 presents a width, parallelly measured to the axis 6, essentially equal to the width of a vane 17 also parallelly measured to the axis 6, and is circumferentially slidable both to the stator 10, and to the vanes 17.
Each vane 17 axially projects from the respective groove 15 inside the cavities 14, and presents an inner edge 20, which extends parallel to the axis 6, and is essentially arranged in contact with two annular elements 21, each of which is accommodated inside one of the cavities 14, extends about the shaft 8, and presents a diameter larger than the diameter of the shaft 8 and smaller than the diameter of the respective cavity 14 so as to float inside the respective cavity 14 itself. Each pair of respectively adjacent vanes 17 circumferentially defines a respective pumping chamber 22, which is further limited radially by the rotor 9 and by the shoe 19 and axially by the plates 3 and 7, is shifted by the rotor 9 about the axis 6 and through a suction inlet 23 and a delivery outlet 24 of the oil, and presents, following the rotation of the rotor 9 about the axis 6 and the eccentricity between the rotor 9 and the surface 11 of the stator 10, a variable volume.
Furthermore, with regard to this it is important to point out that the volume of each chamber 22 at the inlet 23 and at the outlet 24 and, therefore, the delivery of the pump 1 are selectively controlled by shifting the stator 10 about the axis 13 and, therefore, modifying the eccentricity between the rotor 9 and the surface 11 of the stator 10 itself.
As shown in figure 2, each vane 17 comprises a plurality of foils 25 (in the case shown, four foils 25) , which are reciprocally overlapped, and are slidingly radially coupled one to the other to ensure a relatively efficient fluidtight coupling between the vane 17 and the shoe 19.
With reference to figure 4, the annular shoe 19 is replaced with a plurality of shoes 26 (in the case shown, three shoes 26) , each of which is arranged between the surface 11 and two respective vanes 17, is slidingly circumferentially coupled to the surface 11 and to the respective vanes 17, and presents two curved ends 27, one of which is essentially arranged in contact with a respective vane 17. With reference to figure 5, the annular shoe 19 is replaced with a single shoe 28, which is arranged between the surface 11 and the vanes 17, extends about the axis 6 according to an angle smaller than 360°, is slidingly circumferentially coupled to the surface 11 and to the vanes 17, and presents two curved ends 29, one of which is essentially arranged in contact with a respective vane 17.
According to a variation not shown, the shoes 19, 26, and 28 are housed inside respective cavities, which are obtained in the stator 10, and outwardly open at the surface 11, and outwardly project from the respective cavities to arrange themselves in contact with the respective vanes 17.
According to a further variation not shown, the curved ends 27, 29 of each shoe 26, 28 are replaced with two enlarged edges parallel to the axis 6.
The operation of the pump 1 is easily inferred from the description set forth above and does not require further explanations.

Claims

C L A I M S
1.- A variable delivery vane pump, in particular for oil, the pump comprising a rotor (9), which is mounted to turn about one own longitudinal axis (6), and presents a plurality of grooves (15) outwardly radially open at one own surface (16) essentially coaxial to said axis (6); a stator (10) , which extends about the rotor (9) , and is eccentrically mounted with respect to the rotor (9) itself; a plurality of vanes (17), each of which is slidingly mounted inside a respective said groove (15), and presents an outer edge (18) facing the stator (10); and adjusting means (12) for selectively controlling the eccentricity between the rotor (9) and the stator (10); and being characterised in that each vane (17) comprises at least two foils (25) reciprocally overlapped and slidingly coupled one to the other.
2.- A pump according to claim 1 and further comprising two annular elements (21), which are arranged on opposite bands of the rotor (9) parallel to said axis (6), and extend about the axis (6) itself; each vane (17) axially projecting from said respective groove (15) and presenting an inner edge (20) essentially arranged in contact with said annular elements (21) .
3.- A pump according to claim 1 or 2 and further comprising a sliding element (19; 26; 28) arranged between the stator (10) and the outer edges (18) of the vanes (17) .
4.- A pump according to claim 3 and comprising a single said -sliding element (19) extending about said axis (6) according to an angle equal to 360°.
5,- A pump according to claim 3 and comprising a single said sliding element (28) extending about said axis (6) according to an angle smaller than 360°.
6.- A pump according to claim 5, in which said sliding element (28) presents two curved ends (29) .
7.- A pump according to claim 5, in which said sliding element (28) presents two enlarged end edges essentially parallel to said axis (6) .
8.- A pump according to claim 3 and comprising at least two said sliding elements (26) distributed about said axis (6) .
9.- A pump according to claim 8, in which each of said sliding elements (26) presents two curved ends (27) .
10.- A pump according to claim 8, in which each of said sliding elements (26) presents two enlarged end edges essentially parallel to said axis (6) .
11.- A pump according to any of the claims from 3 to 10, in which each of said sliding elements (19; 26; 28) is slidingly circumferentially coupled to the stator (10) and to the vanes (17) .
12.- A variable delivery vane pump, in particular for oil, the pump comprising a rotor (9) , which is mounted to turn about one own longitudinal axis (6), and presents a plurality of grooves (15) outwardly open at one of its surfaces' (16) essentially coaxial to said axis
(6); a stator (10), which extends about the rotor (9), and is eccentrically mounted with respect to the rotor
(9) itself; a plurality of vanes (17), each of which is slidingly mounted inside a respective said groove (15) , and presents an outer edge (18) facing the stator (10) ; and adjusting means (12) for selectively controlling the eccentricity between the rotor (9) and the stator (10); and being characterised in that each vane (17) comprises at least two foils (25) reciprocally overlapped and slidingly coupled one to the other; at least one sliding element (19; 26; 28) being arranged between the stator
(10) and the vanes (17) .
PCT/IB2005/003455 2004-11-19 2005-11-18 Variable-delivery vane pump, in particular for oil WO2006054161A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05803886A EP1812711A1 (en) 2004-11-19 2005-11-18 Variable-delivery vane pump, in particular for oil
JP2007542151A JP2008520899A (en) 2004-11-19 2005-11-18 Variable discharge vane pump for oil discharge
US11/719,734 US20090175750A1 (en) 2004-11-19 2005-11-18 Variable delivery vane oil pump, in particular for oil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO2004A000715 2004-11-19
IT000715A ITBO20040715A1 (en) 2004-11-19 2004-11-19 VARIABLE FLOW PUMP PUMP, IN PARTICULAR FOR OIL

Publications (1)

Publication Number Publication Date
WO2006054161A1 true WO2006054161A1 (en) 2006-05-26

Family

ID=35954056

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/003455 WO2006054161A1 (en) 2004-11-19 2005-11-18 Variable-delivery vane pump, in particular for oil

Country Status (6)

Country Link
US (1) US20090175750A1 (en)
EP (1) EP1812711A1 (en)
JP (1) JP2008520899A (en)
CN (1) CN101137846A (en)
IT (1) ITBO20040715A1 (en)
WO (1) WO2006054161A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20040716A1 (en) * 2004-11-19 2005-02-19 H P E High Performance Enginee VARIABLE FLOW PUMP PUMP, IN PARTICULAR FOR OIL
CN102425548A (en) * 2011-12-22 2012-04-25 上海成峰流体设备有限公司 Blade structure of blade pump
US9808817B2 (en) 2014-05-02 2017-11-07 Graco Minnesota Inc. Paint sprayer floating pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR745730A (en) * 1933-05-13
FR778346A (en) * 1933-12-05 1935-03-14 Improvements to vane blowers
FR1273514A (en) * 1960-10-27 1961-10-13 Further training in rotary volumetric pallet machines
GB2074247A (en) * 1980-04-16 1981-10-28 Skf Kugellagerfabriken Gmbh Rotary Positive-displacement Pumps
US20010036411A1 (en) * 2000-02-15 2001-11-01 Walker Frank H. Reversible variable displacement hydraulic pump and motor
US20010055538A1 (en) * 2000-01-20 2001-12-27 Willi Schneider Vane cell pump/motor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371942A (en) * 1943-02-20 1945-03-20 Morgan T Armstrong Rotary engine
JPS59188089A (en) * 1983-03-31 1984-10-25 Mazda Motor Corp Rotating sleeve for rotary compressor
JPS6035192A (en) * 1983-08-04 1985-02-22 Nissan Motor Co Ltd Variable volume type vane pump
DE19533686C2 (en) * 1995-09-12 1997-06-19 Daimler Benz Ag Adjustable vane pump as a lubricant pump
ITBO20040716A1 (en) * 2004-11-19 2005-02-19 H P E High Performance Enginee VARIABLE FLOW PUMP PUMP, IN PARTICULAR FOR OIL
ITBO20040088U1 (en) * 2004-11-19 2005-02-19 H P E High Performance Engineering OIL PUMP WITH VARIABLE FLOW PALLETS

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR745730A (en) * 1933-05-13
FR778346A (en) * 1933-12-05 1935-03-14 Improvements to vane blowers
FR1273514A (en) * 1960-10-27 1961-10-13 Further training in rotary volumetric pallet machines
GB2074247A (en) * 1980-04-16 1981-10-28 Skf Kugellagerfabriken Gmbh Rotary Positive-displacement Pumps
US20010055538A1 (en) * 2000-01-20 2001-12-27 Willi Schneider Vane cell pump/motor
US20010036411A1 (en) * 2000-02-15 2001-11-01 Walker Frank H. Reversible variable displacement hydraulic pump and motor

Also Published As

Publication number Publication date
US20090175750A1 (en) 2009-07-09
JP2008520899A (en) 2008-06-19
CN101137846A (en) 2008-03-05
ITBO20040715A1 (en) 2005-02-19
EP1812711A1 (en) 2007-08-01

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