EP0467571A1 - Improvements in gerotor pumps - Google Patents
Improvements in gerotor pumps Download PDFInfo
- Publication number
- EP0467571A1 EP0467571A1 EP91306147A EP91306147A EP0467571A1 EP 0467571 A1 EP0467571 A1 EP 0467571A1 EP 91306147 A EP91306147 A EP 91306147A EP 91306147 A EP91306147 A EP 91306147A EP 0467571 A1 EP0467571 A1 EP 0467571A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- annulus
- pump
- male
- lobes
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Images
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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
-
- 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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
Definitions
- This invention relates to gerotor pumps which, as well known, comprise a male lobed rotor with n lobes and a female lobed rotor or annulus with n+1 lobes in which the male rotor is located and meshed. Both are contained in a pump body. This creates a series of chambers between the two rotors, and when the two rotors turn about their parallel axes the chambers vary in volume between a minimum and a maximum on the inlet side thus inducing fluid flow into the chambers through an inlet port and vice versa on the outlet side thus expelling fluid from the pump through an outlet port.
- the annulus may be held axially in the body 46 by means of a washer 50 and a circlip 52 as illustrated in the lower half of Figure 2; alternatively a more massive retaining ring 54 may be pressed into the cylindrical cavity which receives the gerotor set as an interference fit therein, and used to retain the parts in the required axial positions.
- a washer 50 and a circlip 52 as illustrated in the lower half of Figure 2
- a more massive retaining ring 54 may be pressed into the cylindrical cavity which receives the gerotor set as an interference fit therein, and used to retain the parts in the required axial positions.
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 gerotor pump has the internal leakage paths reduced by making the female lobed annulus 12 (Figure 1) as a cup shaped part receiving the male lobed rotor 10.
Description
- This invention relates to gerotor pumps which, as well known, comprise a male lobed rotor with n lobes and a female lobed rotor or annulus with n+1 lobes in which the male rotor is located and meshed. Both are contained in a pump body. This creates a series of chambers between the two rotors, and when the two rotors turn about their parallel axes the chambers vary in volume between a minimum and a maximum on the inlet side thus inducing fluid flow into the chambers through an inlet port and vice versa on the outlet side thus expelling fluid from the pump through an outlet port.
- One of the matters to be taken into account in pump design is leakage of fluid from the high pressure chambers through the working clearances of the pump which at the least may lead to loss of pumping efficiency. The object of the invention is to provide improvements in this area.
- According to the invention, the female rotor (annulus) is cup-shaped and the male rotor is wholly located in said cup. This can substantially reduce leakage at one axial end of the chambers, that is at the base of the cup since fluid can no longer flow across one axial end face of the annulus to reach the cavity in the pump body in which the annulus is journalled.
- Various embodiments of the invention are now more particularly described with reference to the accompanying drawings wherein:-
- Figure 1 is a sectional elevation of a first embodiment;
- Figure 2 is a similar view of a second embodiment;
- Figure 3 is a section on the line X-X of Figure 2 or Figure 3 to show a typical layout.
- Turning first to Figure 1 and 3, the gerotor pump comprises a
male lobed rotor 10 which, in this illustrated embodiment has six lobes, although the precise number is unimportant to the present invention. - The rotor is received in an
annulus 12 which essentially has one (or theoretically more than one) extra lobe. This creates a series of working chambers such as 14 Figure 3 each defined between the rotor lobes and the annulus lobes. In rotation of the parts, the rotor turns about theaxis 16 and the annulus about the,axis 18, drive being imparted to one of these parts by the other of them, and the rotation being at different speeds. As a consequence, the working chambers rotate or precess about the axes varying in volume from a minimum to a maximum as the chambers pass over the inlet port and varying in volume from a maximum to a minimum as the chambers pass over the outlet port. - Each chamber extends axially, i.e. in the Figure 1 position, over the axial length of the meshed lobes.
- Figure 1 shows the
pump body 20 provided with inlet andoutlet passages 22 24, and with a generally cylindrical cavity having anend wall 26 upon which theparts outlet passages 22 24. - According to the invention, the
annulus 12 is made as a cup-shaped component with abase wall 36 which is generally planar and parallel to thewall 26. Hence the male lobedrotor 10 is received wholly within that cup. - In this particular embodiment of the invention, the annulus is driven by
drive means 38 which may be a tang, and the drive means 38 may either be integral with theannulus 12 36, or may havedogs 40 engaged between the drive means 38 and the annulus for the purpose of transmitting drive. - It will be appreciated that one of the possible leakage paths in the pump is across the end faces of the annulus and rotor adjacent the
planar wall 26, and this could be generally radially outwardly, e.g. under the influence of centrifugal force, but effectively lead to a reduction of outlet pressure. In the conventional pump, such a leakage path is present at each axial end of the gerotor set, i.e. themeshed parts 10 12, but making the annulus cup-shaped so as to wholly accommodate the rotor, and without aperture in the base of the cup, one of those leakage paths is entirely eliminated. As a result, the internal leakage in the pump is substantially reduced. - The annulus may be held in position by a
retaining ring 56 which may be secured in the body of the pump around the drive means. - Turning now to Figure 2 and 3, there is the same arrangement of rotor and annulus providing working chambers connecting with inlet and outlet passages, here indicated by the
references 40 42. The pump in Figure 2 differs from that in Figure 1 in having a driven rotor instead of a driven annulus, and this is accomplished by means ofdrive shaft 44 journalled in thebody 46 and fast with therotor 10, for example by being an interference fit with the same. The end ofshaft 44 is spaced from thebase 36 of the annulus by aclearance 48. - The annulus may be held axially in the
body 46 by means of awasher 50 and acirclip 52 as illustrated in the lower half of Figure 2; alternatively a moremassive retaining ring 54 may be pressed into the cylindrical cavity which receives the gerotor set as an interference fit therein, and used to retain the parts in the required axial positions. However, the same reduction in available paths and increased efficiency is available from the Figure 2 version as from the Figure 1 version.
Claims (5)
- A gerotor pump comprising a male lobed rotor with n lobes and a female lobed rotor with n+1 lobes in which the male rotor is located and meshed, both parts being contained in a cylindrical cavity in a pump body, and characterised in that the female rotor or annulus is cup shaped and wholly contains the male rotor so as to reduce leakage paths.
- A pump as claimed in Claim 1 wherein the annulus is driven and transfers drive to the rotor.
- A pump as claimed in Claim 1 wherein the rotor is driven and transfers drive to the annulus.
- A pump as claimed in any of Claims 1 to 3 wherein the annulus is fixed in position in the body cavity by a retaining ring.
- A pump substantially as described with reference to Figures 1 and 3 or 2 and 3 of the accompany drawing.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9015291 | 1990-07-11 | ||
GB909015291A GB9015291D0 (en) | 1990-07-11 | 1990-07-11 | Improvements in gerotor pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0467571A1 true EP0467571A1 (en) | 1992-01-22 |
Family
ID=10678959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91306147A Withdrawn EP0467571A1 (en) | 1990-07-11 | 1991-07-05 | Improvements in gerotor pumps |
Country Status (13)
Country | Link |
---|---|
EP (1) | EP0467571A1 (en) |
JP (1) | JPH06501292A (en) |
KR (1) | KR930701692A (en) |
AR (1) | AR244857A1 (en) |
AU (1) | AU640031B2 (en) |
BR (1) | BR9106626A (en) |
CA (1) | CA2046376A1 (en) |
FI (1) | FI925372A0 (en) |
GB (2) | GB9015291D0 (en) |
IE (1) | IE912415A1 (en) |
PT (1) | PT98231A (en) |
WO (1) | WO1992001161A1 (en) |
ZA (1) | ZA915264B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5395217A (en) * | 1991-06-07 | 1995-03-07 | Schwabische Huttenwerke Gmbh | Gear pump for oil for an internal-combustion engine, in particular for motor vehicles |
US6152717A (en) * | 1998-06-11 | 2000-11-28 | Unisia Jecs Corporation | Internal gear pumps |
US8625943B2 (en) | 2008-05-26 | 2014-01-07 | Nippon Telegraph And Telephone Corporation | Waveguide device and module |
DE102016213611A1 (en) * | 2016-07-25 | 2018-01-25 | Zf Friedrichshafen Ag | Rotor pump and arrangement for driving a rotor pump |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19807630A1 (en) | 1998-02-23 | 1999-08-26 | Bayer Ag | Water-based composition useful for controlling parasitic insects and mites, especially lice, on humans |
US7410349B2 (en) * | 2004-10-26 | 2008-08-12 | Magna Powertrain Usa, Inc. | High efficiency gerotor pump |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR566247A (en) * | 1923-04-26 | 1924-02-11 | Hill Engineering Co Inc | Conjugate rotors |
US1486836A (en) * | 1923-04-28 | 1924-03-11 | Hill Compressor & Pump Company | Rotary-pump pressure control |
GB2100354A (en) * | 1981-06-16 | 1982-12-22 | Fuji Heavy Ind Ltd | An internal-combustion engine oil pump |
DE3603773A1 (en) * | 1986-01-03 | 1987-07-09 | Schwaebische Huettenwerke Gmbh | Gear machine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB233423A (en) * | 1924-02-07 | 1925-05-07 | Hill Compressor & Pump Co Inc | Improvements in or relating to rotary pumps or the like |
GB331054A (en) * | 1929-01-03 | 1930-07-03 | Thomas Winter Nichols | Improvements in rotary pumps, compressors and the like |
GB370474A (en) * | 1930-12-11 | 1932-04-11 | Thomas Winter Nichols | Improvements in rotary pumps |
GB404424A (en) * | 1932-10-19 | 1934-01-18 | Aladar Ledacskiss | Improvements in or relating to rotary toothed-wheel engines |
US3121341A (en) * | 1960-05-25 | 1964-02-18 | Francis A Hill | Gears with rigid molded surfaces |
IT1118556B (en) * | 1979-04-12 | 1986-03-03 | Whitehead Moto Fides Spa Stabi | PROCEDURE FOR THE REALIZATION OF A ROTARY MECHANICAL PUMP AND RELATED PUMP OBTAINED |
GB2219631B (en) * | 1988-06-09 | 1992-08-05 | Concentric Pumps Ltd | Improvements relating to gerotor pumps |
ES2045459T3 (en) * | 1988-09-28 | 1994-01-16 | Concentric Pumps Ltd | IMPROVEMENTS INTRODUCED IN GEROTOR PUMPS. |
-
1990
- 1990-07-11 GB GB909015291A patent/GB9015291D0/en active Pending
-
1991
- 1991-07-05 EP EP91306147A patent/EP0467571A1/en not_active Withdrawn
- 1991-07-05 AU AU81025/91A patent/AU640031B2/en not_active Ceased
- 1991-07-05 PT PT98231A patent/PT98231A/en not_active Application Discontinuation
- 1991-07-05 CA CA002046376A patent/CA2046376A1/en not_active Abandoned
- 1991-07-05 JP JP3511891A patent/JPH06501292A/en active Pending
- 1991-07-05 WO PCT/GB1991/001101 patent/WO1992001161A1/en active Application Filing
- 1991-07-05 GB GB9114604A patent/GB2245935A/en not_active Withdrawn
- 1991-07-05 BR BR919106626A patent/BR9106626A/en not_active IP Right Cessation
- 1991-07-05 KR KR1019920703377A patent/KR930701692A/en not_active Application Discontinuation
- 1991-07-08 ZA ZA915264A patent/ZA915264B/en unknown
- 1991-07-10 IE IE241591A patent/IE912415A1/en unknown
- 1991-07-11 AR AR91320121A patent/AR244857A1/en active
-
1992
- 1992-11-26 FI FI925372A patent/FI925372A0/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR566247A (en) * | 1923-04-26 | 1924-02-11 | Hill Engineering Co Inc | Conjugate rotors |
US1486836A (en) * | 1923-04-28 | 1924-03-11 | Hill Compressor & Pump Company | Rotary-pump pressure control |
GB2100354A (en) * | 1981-06-16 | 1982-12-22 | Fuji Heavy Ind Ltd | An internal-combustion engine oil pump |
DE3603773A1 (en) * | 1986-01-03 | 1987-07-09 | Schwaebische Huettenwerke Gmbh | Gear machine |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5395217A (en) * | 1991-06-07 | 1995-03-07 | Schwabische Huttenwerke Gmbh | Gear pump for oil for an internal-combustion engine, in particular for motor vehicles |
US6152717A (en) * | 1998-06-11 | 2000-11-28 | Unisia Jecs Corporation | Internal gear pumps |
US8625943B2 (en) | 2008-05-26 | 2014-01-07 | Nippon Telegraph And Telephone Corporation | Waveguide device and module |
DE102016213611A1 (en) * | 2016-07-25 | 2018-01-25 | Zf Friedrichshafen Ag | Rotor pump and arrangement for driving a rotor pump |
DE102016213611B4 (en) | 2016-07-25 | 2022-12-01 | Zf Friedrichshafen Ag | Rotor pump and arrangement for driving a rotor pump |
Also Published As
Publication number | Publication date |
---|---|
WO1992001161A1 (en) | 1992-01-23 |
BR9106626A (en) | 1993-06-01 |
KR930701692A (en) | 1993-06-12 |
GB9114604D0 (en) | 1991-08-21 |
ZA915264B (en) | 1992-04-29 |
FI925372A (en) | 1992-11-26 |
FI925372A0 (en) | 1992-11-26 |
AU8102591A (en) | 1992-02-04 |
JPH06501292A (en) | 1994-02-10 |
CA2046376A1 (en) | 1992-01-12 |
GB2245935A (en) | 1992-01-15 |
IE912415A1 (en) | 1992-01-15 |
AR244857A1 (en) | 1993-11-30 |
GB9015291D0 (en) | 1990-08-29 |
PT98231A (en) | 1993-08-31 |
AU640031B2 (en) | 1993-08-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19920706 |
|
17Q | First examination report despatched |
Effective date: 19930601 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19950725 |