WO2004031576A2 - Hydraulic machine with radial cylinders - Google Patents
Hydraulic machine with radial cylinders Download PDFInfo
- Publication number
- WO2004031576A2 WO2004031576A2 PCT/IT2003/000593 IT0300593W WO2004031576A2 WO 2004031576 A2 WO2004031576 A2 WO 2004031576A2 IT 0300593 W IT0300593 W IT 0300593W WO 2004031576 A2 WO2004031576 A2 WO 2004031576A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- roller
- hydraulic machine
- previous
- piston
- machine according
- Prior art date
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 230000003068 static effect Effects 0.000 claims abstract description 7
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000004873 anchoring Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
- F03C1/0403—Details, component parts specially adapted of such engines
- F03C1/0406—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups
- F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft
- F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/22—Reciprocating-piston liquid engines with movable cylinders or cylinder
- F03C1/24—Reciprocating-piston liquid engines with movable cylinders or cylinder in which the liquid exclusively displaces one or more pistons reciprocating in rotary cylinders
- F03C1/2407—Reciprocating-piston liquid engines with movable cylinders or cylinder in which the liquid exclusively displaces one or more pistons reciprocating in rotary cylinders having cylinders in star or fan arrangement, the connection of the pistons with an actuated element being at the outer ends of the cylinders
Definitions
- the invention concerns a high efficiency hydraulic machine with radial cylinders, that is a machine in which said radial cylinders rotate with the drive shaft and through the rolling of a roller associated with the relative piston cross an outer path, or else the path itself rotates, equipped with cams for the generation of alternating motion, in which the composition of the pistons allows a high efficiency to be attained.
- the state of the art comprises the hydraulic machines that have been known for years in which in said cylinders the pistons move behind the action of the outer cam and against which they are thrusted by the pressure of the hydraulic liquid present in them.
- Said 'type of machine foresees using a roller arranged inside the piston itself between the outer end of each piston and the cam. The rotation of the shaft, or of the liner with the cam, makes said roller slide on the cam realising the radial alternating motion of the piston in the corresponding cylinder.
- Said rollers are coupled with the "corresponding piston with a portion of anti-friction ferrule or with a hydrostatic support bearing: from this comes substantial energy consumption, during the compression of the piston against the path of said cam, indeed by sliding friction between ' said roller and the piston itself or by leaking of the liquid from said hydraulic bearing.
- the hydraulic machine is slightly larger due to the fact that the roller, obviously larger in size, ' does not enter into the diameter of the liner.
- a further technical problem is that of minimising the spaces occupied by the inactive parts of the motor and, on the other hand, increasing the spaces occupied by active parts of the motor.
- the invention solves the aforementioned technical problem by adopting a hydraulic machine with radial cylinders of the type comprising the pistons with radial stroke, arranged in contact with an outer cam and coplanar with said group of cylinders, each equipped with a roller on the path of said cam, characterised in that it has, in each piston, a rolling bearing arranged with the inner ring coupled or coinciding with the support pin for said roller and the outer ring coupled or coinciding with the roller itself.
- roller and the corresponding rolling bearing of a small size such as to allow entry into the liner of the cylinder.
- a piston for a hydraulic machine with radial cylinders with the pistons with radial stroke arranged in contact with an outer cam and coplanar with said gro-up of cylinders, equipped with a roller on the path of said cam, characterised in that it has said roller coupled in rotation with said piston with a rolling bearing.
- the anti-friction ferrule consisting of a spacer sleeve mounted with interference on said pin: the anti-fricti ⁇ n surface of the ferrule is in sliding contact on the outer surface of said sleeve .
- the thickness of said layer of anti-friction plastic material advantageously between 1 and 12 1/100 of a' millimetre and the thickness of said sintered metal anchoring layer between 10 and 40 1/100 of a millimetre.
- a piston for a hydraulic machine with radial cylinders with the pistons with radial stroke arranged in contact with an outer cam and coplanar with said group of cylinders, equipped with a roller on the path of said cam, characterised in that it has said roller coupled in rotation with said piston with an anti-friction ferrule and relative support pin.
- both static and dynamic 0- rings each consisting of a metal ring mounted with interference in the coupling on the sealing diameter and housed in a throat with slight axial clearance; advantageously, they have a large depth of said throat with respect to its width and the width of the ring and the side shoulder of each 0-ring with a width a little greater than the depth of the throat.
- Figure 1 is the side schematic view of a hydraulic machine according to the present invention
- Figure 2 is the schematic view of a partial radial section of the single radial cylinder
- Figure 3 is a schematic view in section III*-III of figure 2
- Figure 4 is a schematic side view of a piston complete with roller and pin for rotation of a second embodiment of the present invention
- Figure 5 is a schematic side section view of the piston of the previous figure
- Figure 6 is a schematic side view of the piston of figures 4 and 5
- Figure 7 is a schematic axial section view of the piston of figure 4
- Figure 8 is a schematic diametric section view of the piston of figure 4
- Figure 9 is a schematic axial view of a motor with an outer cam and radial cylinders, equipped with a displacement selector, in which metal 0-rings are applied in a further aspect of the present invention
- Figure 10 is a schematic axial section view of the piston, like figure 7, but with a different way of lubricating
- Figures 1 shows the drive shaft 1, rigidly connected to and rotating with the cylinder group 2 in which, in the cylinders shown 3, 4, 5, 6 and 7, there are pistons 8 equipped with a pin 9 on which the outer ring 10 is coupled in rotation through the interposition of small rollers 11, constituting a rolling bearing with rollers.
- the outer ring 10 is therefore made to roll on the path 12 of the cam 13, arranged in the same axial plane as the cylinder group 2; said ring constitutes the roller of' the piston on said path
- figure 2 shows the rolling bearing 14 for supporting the drive shaft 1 in rotation on the liner 15 of the hydraulic machine.
- Said pin 9 is rigidly connected to the body of the piston 8 through caulking 16 of its ends.
- the small rollers 11 are spaced apart, advantageously, through a single central cage 17, arranged ' in the middle of them with a seat formed in the outer ring 10 which, as stated, acts as a roller of the piston 8 on said path 12. Said pistons 8 are kept in position by the abutment clip 18 sliding in the axial stubbling 19 on the side of said piston.
- figures 4 to 8 show a further embodiment, for obtaining the high efficiency hydraulic machine, comprising a rotating support between the roller 20 and the piston 21 in which the rotation support pin 22, of said roller 20 through the ferrule 23, realised through a planar element 24 in iron material, is wound inside said roller 20, on which there is a layer of anti-friction plastic material stably anchored on it through a layer of sintered metal; said ferrule being with the inner surface in contact and sliding on the outer surface of a spacer sleeve 25 coupled with said pin 22, with substantial interference.
- the shoulders 26 of piston 21 support the extremities of said pin 22 with interference, whereas said spacer sleeve 25 realises the axial shouldering of said shoulders 26 during assembly.
- the thrust blocks 27 are inserted, consisting of the metal body and coating on one face with said layer of anti-friction plastic material and said sintered anchoring layer.
- said figures show the metal 0-ring 28 coupled with interference at the diameter of the liner of the cylinder and inserted in a seat 29, in the piston 21, with slight side clearance; the low thickness and the elasticity in elongation allow the assembly of the entire ring 28 in said seat 29.
- Figure 9 shows a further embodiment, for obtaining the high efficiency hydraulic machine, in which the sizing of the distributor 30, thanks to the application of the static and/or rotating seals 31 with the metal ring 32, allows the passage sections 33 for the hydraulic liquid to be substantially increased without, moreover ' , increasing the bulk of the hydraulic machine.
- said seals allow the size of the parts adjacent to them, such as the side shoulders 34 of the seats of the metal O-rings 32, to be greatly decreased.
- said figure 9 shows a motor with the selection of the active cylinders for the partialisation 35 of the displacement, as in the prior art, which however involves the construction of a distributor that is bulkier than usual.
- said static and/or rotating seals 31, consisting of said metal ring mounted with interference on the sealing diameter D and with slight clearance in the seat 36, formed in the coupling hole of said diameter D.
- the seat 36 is sized with depth of the throat equal to at least 1.5 times the width B of said metal ring 35 in order to allow the assembly of the entire ring inside the hole. .
- the pin 37 is equipped with a communication hole 38 of the pressurised hydraulic fluid from the crown of the piston 39, which with said hole 38, the duct 40 of the piston and the hole 41 of the sleeve 25 takes said fluid in the sliding surface between said sleeve and the ferrule 23.
- the efficiency of the hydraulic machine with radial pistons has an improvement from the usual 70% to 90% on average near to the static torque.
- a substantial economic advantage can be obtained by replacing the previous pistons with the roller with sliding friction with the new pistons equipped with the rolling ' bearing described here.
- Said hydraulic machine shall thus have a somewhat higher efficiency decreasing the energy wastage to obtain the same work without the need to integrally replace the machine itself.
- the pin 9 and the outer ring 10 are treated with setting heat treatments, advantageously carried out on steel of the type with minimised inclusions, to allow a sufficient lifetime of the rolling surfaces.
- the performance of the pistons 21 according to figures 4-8, equipped with the rotation support of the roller 20 allows an excellent reduction in sliding friction to be realised with the sliding of the inner surface made from anti-friction plastic material of the ferrule 23 since the thickness of the layer of anti-friction plastic material is minimal, but slightly greater than the maximum size of the particles not held by the filter of the hydraulic circuit where the hydraulic machine is inserted; it also has the thickness of the. element in iron material of said bearing between 0.4 and 4% of the sliding diameter on said spacer sleeve 25. In this way, the heat generated in sliding is easily transmitted from the plastic material to the metal parts of the piston without taking said plastic material to critical conditions.
- the thickness of the interpositioned thrust blocks 27 in iron material between 10 and 16 1/10 of a millimetre excluding the thickness of the anti-friction plastic material and anchoring sintered layers.
- the thickness of said layer of antifriction plastic material is advantageously between 1 and 12 1/100 of a millimetre; and the thickness of said layer of anchoring sintered metal is between 10 and 40 1/100 of a millimetre.
- the shoulders 34 can be reduced to a size slightly greater than the depth of the throat 36.
- the size of said ring 32 also allows the dimension C of the shoulder 34 to be taken to 2 mm: the width B of the metal O-ring 32 is 1 mm and the depth of the throat 36 is slightly more than 1.5 mm.
- the advantages obtained with the present invention are: the drastic improvement of the losses for friction in the rolling of the roller on the path and on the piston; indeed, the separation of the roller/path and roller/pin sliding surfaces allows the mounting up of the effects of sliding of the outer surface of the roller on the piston and of rolling on the surface of the cam, typical of the state of the art, to be avoided.
- the present invention between the outer ' surface of the roller and the carn ⁇ there is just rolling friction, whereas between the roller and the support pin there can be sliding friction, with the sliding bearing, or sliding friction, with the aforementioned anti-friction ferrule.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Hydraulic Motors (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003279520A AU2003279520A1 (en) | 2002-10-02 | 2003-10-01 | Hydraulic machine with radial cylinders |
US10/529,888 US20060042459A1 (en) | 2002-10-02 | 2003-10-01 | High efficiency hydraulic machine with radial cylinders |
EP03772627A EP1552142A2 (en) | 2002-10-02 | 2003-10-01 | High efficiency hydraulic machine with radial cylinders |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000287A ITMO20020287A1 (en) | 2002-10-02 | 2002-10-02 | HYDRAULIC MACHINE WITH HIGH PERFORMANCE RADIAL CYLINDERS. |
ITMO2002A000287 | 2002-10-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004031576A2 true WO2004031576A2 (en) | 2004-04-15 |
WO2004031576A3 WO2004031576A3 (en) | 2004-07-01 |
Family
ID=32051240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2003/000593 WO2004031576A2 (en) | 2002-10-02 | 2003-10-01 | Hydraulic machine with radial cylinders |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060042459A1 (en) |
EP (1) | EP1552142A2 (en) |
CN (1) | CN100497938C (en) |
AU (1) | AU2003279520A1 (en) |
IT (1) | ITMO20020287A1 (en) |
WO (1) | WO2004031576A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201600124647A1 (en) * | 2016-12-09 | 2018-06-09 | Ibs Motortech Italia Srl | "SYSTEM FOR THE REVERSIBLE TRANSFORMATION OF AN ALTERNATED MOTION IN ROTARY MOTION" |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2946406B1 (en) * | 2009-06-05 | 2016-07-01 | Skf Ab | FOLLOWING CAM ROLL DEVICE, IN PARTICULAR FOR A FUEL INJECTION PUMP. |
DE102015222291B4 (en) * | 2015-11-12 | 2019-09-12 | Robert Bosch Gmbh | Radial piston machine with anti-rotation braking means |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB441760A (en) * | 1935-09-24 | 1936-01-24 | Charles Hyland | Improvements in hydraulic motors |
CH244148A (en) * | 1944-06-14 | 1946-08-31 | Blanc Eugene | Hydraulic motor. |
US3357312A (en) * | 1964-08-13 | 1967-12-12 | Inst Gornogo Dela Imeni Skochi | Radial-piston hydraulic motor |
US3477884A (en) * | 1964-07-29 | 1969-11-11 | Kugelfischer G Schaefer & Co | Method of increasing the fatigue life of rolling contact elements and the resulting articles |
US3994544A (en) * | 1974-08-05 | 1976-11-30 | Flatland Lloyd P | Bearing for a high speed air turbine |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2127268A5 (en) * | 1971-03-02 | 1972-10-13 | Poclain Sa | |
US3841279A (en) * | 1972-07-20 | 1974-10-15 | C Burns | Engine with radially reciprocal rotor mounted pistons |
US4334506A (en) * | 1975-11-17 | 1982-06-15 | Albert Albert F | Reciprocating rotary engine |
US4136602A (en) * | 1976-05-24 | 1979-01-30 | Lenz Leonard L | Hydraulic motor |
CS212800B2 (en) * | 1976-07-15 | 1982-03-26 | Ivan J Cyphelly | Delivery apparatus with hydrostatic torque transfer by cylindrical pistons |
SE456517B (en) * | 1982-09-08 | 1988-10-10 | Hegglund & Soner Ab | HYDRAULIC RADIAL PISTON ENGINE |
DE4004932C2 (en) * | 1990-02-16 | 1995-04-13 | Rexroth Mannesmann Gmbh | Radial piston machine |
FR2727471A1 (en) * | 1994-11-30 | 1996-05-31 | Poclain Hydraulics Sa | PISTON MECHANISM, MOTOR OR PUMP PROVIDED WITH ROLLERS SUPPORTING ON A CAM |
CN1112191A (en) * | 1995-02-28 | 1995-11-22 | 卡尔·厄本 | Motor |
FR2764947B1 (en) * | 1997-06-23 | 1999-10-01 | Poclain Hydraulics Sa | HYDRAULIC MOTOR |
-
2002
- 2002-10-02 IT IT000287A patent/ITMO20020287A1/en unknown
-
2003
- 2003-10-01 WO PCT/IT2003/000593 patent/WO2004031576A2/en not_active Application Discontinuation
- 2003-10-01 US US10/529,888 patent/US20060042459A1/en not_active Abandoned
- 2003-10-01 CN CNB2003801008922A patent/CN100497938C/en not_active Expired - Fee Related
- 2003-10-01 EP EP03772627A patent/EP1552142A2/en not_active Withdrawn
- 2003-10-01 AU AU2003279520A patent/AU2003279520A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB441760A (en) * | 1935-09-24 | 1936-01-24 | Charles Hyland | Improvements in hydraulic motors |
CH244148A (en) * | 1944-06-14 | 1946-08-31 | Blanc Eugene | Hydraulic motor. |
US3477884A (en) * | 1964-07-29 | 1969-11-11 | Kugelfischer G Schaefer & Co | Method of increasing the fatigue life of rolling contact elements and the resulting articles |
US3357312A (en) * | 1964-08-13 | 1967-12-12 | Inst Gornogo Dela Imeni Skochi | Radial-piston hydraulic motor |
US3994544A (en) * | 1974-08-05 | 1976-11-30 | Flatland Lloyd P | Bearing for a high speed air turbine |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201600124647A1 (en) * | 2016-12-09 | 2018-06-09 | Ibs Motortech Italia Srl | "SYSTEM FOR THE REVERSIBLE TRANSFORMATION OF AN ALTERNATED MOTION IN ROTARY MOTION" |
WO2018104923A1 (en) * | 2016-12-09 | 2018-06-14 | Ibs Motor Tech D.O.O. | A system for the reversible transformation of a reciprocating motion in a rotary motion |
RU2754378C2 (en) * | 2016-12-09 | 2021-09-01 | Ибс Мотортек Италия Срл | System of reversible conversion of reciprocating motion into rotational motion |
US11466569B2 (en) | 2016-12-09 | 2022-10-11 | Ibs Motortech Italia Srl | System for the reversible transformation of a reciprocating motion in a rotary motion |
US11994030B2 (en) | 2016-12-09 | 2024-05-28 | Ibs Motortech Italia Srl | System for the reversible transformation of a reciprocating motion in a rotary motion |
Also Published As
Publication number | Publication date |
---|---|
CN1703581A (en) | 2005-11-30 |
AU2003279520A8 (en) | 2004-04-23 |
CN100497938C (en) | 2009-06-10 |
ITMO20020287A1 (en) | 2004-04-03 |
WO2004031576A3 (en) | 2004-07-01 |
US20060042459A1 (en) | 2006-03-02 |
AU2003279520A1 (en) | 2004-04-23 |
EP1552142A2 (en) | 2005-07-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7878169B2 (en) | Cam roller pin with transverse grooves | |
EP2875217B1 (en) | A concentric camshaft arrangement | |
US20120156080A1 (en) | Hydraulic Toothed Wheel Machine | |
CN107429676B (en) | Hydraulic pump | |
US20080017140A1 (en) | Rotary Radial Piston Machine | |
US20210285429A1 (en) | Hydrostatic machine comprising a cam ring | |
US20060042459A1 (en) | High efficiency hydraulic machine with radial cylinders | |
US20140298988A1 (en) | Piston unit and hydrostatic radial piston machine | |
CN112431756A (en) | Sealing structure of duplex gear pump with clearance compensation function | |
JP2006510841A (en) | Gear machine with axial side plate | |
US5865150A (en) | Device for varying the valve timing of gas exchange valves of an internal combustion engine | |
CN114630961B (en) | Roller tappet for a piston pump, and piston pump | |
US8322999B2 (en) | Hydrostatic axial piston machine | |
JP2003343421A (en) | Swash plate type fluid machine provided with swash plate pressure equalization device | |
EP1193394B1 (en) | Two piece barrel design for a hydraulic oil pump | |
JPH08270546A (en) | Rotary swash plate type piston pump | |
US4259894A (en) | Hydrostatic motor | |
JP2003343424A (en) | Swash plate type fluid pump/motor | |
US5916350A (en) | Piston rod bearing assembly of reciprocating piston engine | |
JP2009127538A (en) | Swash plate type hydraulic pump | |
US2101731A (en) | Hydraulic machine | |
JP2001132847A (en) | Rotating shaft sealing device | |
JP2003343450A (en) | Fluid machine provided with surface-treated piston | |
EP1428979A8 (en) | Rotary fluid machinery | |
JP2004190521A (en) | Thrust support structure in multi-stroke type radial piston motor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 20038A08922 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2003772627 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 778/CHENP/2005 Country of ref document: IN |
|
WWP | Wipo information: published in national office |
Ref document number: 2003772627 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2006042459 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10529888 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10529888 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: JP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: JP |