EP1658437A1 - Gear tooth and external gear pump - Google Patents
Gear tooth and external gear pumpInfo
- Publication number
- EP1658437A1 EP1658437A1 EP04785984A EP04785984A EP1658437A1 EP 1658437 A1 EP1658437 A1 EP 1658437A1 EP 04785984 A EP04785984 A EP 04785984A EP 04785984 A EP04785984 A EP 04785984A EP 1658437 A1 EP1658437 A1 EP 1658437A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tooth
- gear
- sector
- gear pump
- convex
- 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.)
- Granted
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
- 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
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
-
- 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
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
Definitions
- the present invention relates to a gear tooth and a pump, in particular an oil pump provided with corresponding gears. More specifically, this invention relates to a gear tooth having a foot concave at its starting point at the foot of the neighboring tooth, and a head connected to said foot.
- This tooth finds a preferred, but not exclusive, application in an external gear pump comprising at least one pair of toothed pinions in mutual engagement.
- Such a pump which is also the subject of the invention, can be used in a combustion engine, but the invention also applies to all pumps with external gears.
- a conventional gear pump tooth profile has a concave trochoidal base followed by an involute head.
- the object of the present invention is to increase the volume of oil displaced between the teeth by optimizing the profile thereof without prejudice to the continuity of the gear. More precisely, the objective sought is to increase the flow rate, the pressure and the volumetric efficiency at low 1 speed of a gear pump, without increasing its size.
- the invention proposes that the head of each tooth has two convex sectors connected by a transition point marking a break in the curve.
- the second active point of the profile thus delimits the bottom of a notch inscribed in the profile of the tooth.
- the first convex sector of the tooth head has an involute profile.
- the pump proposed by the invention comprises two identical or different toothed wheels.
- FIG. 1 shows in section a tooth of a toothed wheel according to the invention
- FIGs 2A to 2F illustrate the gearing of the two wheels of the pump
- - Figures 3A and 3B highlight the gains obtained by l 'invention.
- Figure 1 highlights the two main parts of tooth 1, namely its foot 2 and its head 3, connected by an active transition point 4.
- the foot 2 has a concave shape, and is connected to its starting point 6, at the foot of the neighboring tooth (not shown in Figure 1).
- the tooth head has two convex sectors 7, 8, connected by an active point of
- the transition point 9 delimits the bottom of a notch inscribed in the profile of the tooth.
- the convex sector 7 following the first transition point 4 has an involute profile. This involute profile therefore extends between the two active transition points 4 and 9 of tooth 1, and constitutes a first convex sector of the foot 2.
- the second convex sector 8, or convex extension profile, which makes further to point 9, can also have a prof in involute of circle, without however that this particular provision is imperative, and one can envisage other extension profiles for this second convex sector, without departing from the scope of the invention.
- the head of the tooth has a rounded end sector 11, connected to the second convex sector 8 by a transition sector 12.
- the tooth is symmetrical, and there is a concordance of shape between the end sector 11 of the teeth. and the concave sector defined by the juxtaposition of two feet 2 of neighboring teeth, so that the end sector of a tooth can roll between two teeth of the opposite wheel, keeping contact with them until what it escapes.
- the two gears of the pump can be identical, and this characteristic provides a considerable advantage to the proposed pump, in terms of process and manufacturing costs. Referring to Figures 2A to 2F ( Figure 2F corresponding to the same meshing situation as Figure 2A for the following teeth), we see that there are several points of contact between the teeth.
- the tooth 1a of a first wheel has just exceeded the axis of symmetry of the opposite gap. It is in main support (double circle) by its convex surface 8 with the active transition point 4 of the opposite tooth 1b, while its end sector 11, rolls on the concave foot 2 thereof. After a slight relative displacement of the teeth 1a, 1b (FIG.
- the main fulcrum is between the convex sector 7 of the tooth le and the active transition point 4 of the tooth ld, while the head of the wheel le, rolls in the transition region of the teeth la and ld.
- the end sector continues to roll on the foot 2 of the tooth la, while the main support is between the active transition point 4 of the tooth ld and the convex sector 7 of the tooth le (FIG. 2E).
- FIG. 2F a situation similar to FIG. 2A has been found, but this time between the teeth le and id.
- FIG. 3A shows the very significant increase in the volume of the interposed displaced with respect to a conventional tooth developing in a circle, thanks to the lengthening of the height of the tooth and to the increase in the interval between the teeth.
- FIG. 3B is a figure of principle, where one can see the different trajectories of several points of the tooth profile proposed by the invention, in the intersection of the conjugate pinion, with a pronounced elongated epicyclic effect, allowing strong development of the volume moved.
- the tooth profile proposed by the invention has the particularity of combining sections in the involute of a circle, the advantages of which are already known, with bearing sections with special profiles. This combination simultaneously ensures continuity of engagement and a sufficient toothing line and a very strong development of the volume of oil displaced.
- the tooth profile proposed by the invention allows in particular a flow gain, in particular at low speed, of the order of 30% to 40%, compared to a conventional pump toothing with involute of a circle.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Gears, Cams (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0310040A FR2859000B1 (en) | 2003-08-20 | 2003-08-20 | GEAR TOOTH AND EXTERNAL GEAR PUMP |
PCT/FR2004/001925 WO2005021972A1 (en) | 2003-08-20 | 2004-07-21 | Gear tooth and external gear pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1658437A1 true EP1658437A1 (en) | 2006-05-24 |
EP1658437B1 EP1658437B1 (en) | 2008-06-25 |
Family
ID=34112826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04785984A Expired - Lifetime EP1658437B1 (en) | 2003-08-20 | 2004-07-21 | Gear tooth and external gear pump |
Country Status (8)
Country | Link |
---|---|
US (1) | US8109748B2 (en) |
EP (1) | EP1658437B1 (en) |
JP (1) | JP4936888B2 (en) |
AT (1) | ATE399266T1 (en) |
DE (1) | DE602004014625D1 (en) |
ES (1) | ES2305859T3 (en) |
FR (1) | FR2859000B1 (en) |
WO (1) | WO2005021972A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111197574A (en) * | 2018-11-20 | 2020-05-26 | 宿迁学院 | High-performance novel parabolic rotor for pump |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101109436B (en) * | 2006-07-21 | 2011-02-16 | 北京交通大学 | Speed increasing or speed reducing gear pair adapted for power transmission |
US8312785B2 (en) * | 2008-06-20 | 2012-11-20 | Graco Minnesota Inc. | Involute gear teeth for fluid metering device |
WO2012122056A1 (en) | 2011-03-04 | 2012-09-13 | Simplehuman, Llc | Soap dispensing units with anti-drip valve |
USD659452S1 (en) | 2011-03-04 | 2012-05-15 | Simplehuman, Llc | Soap pump |
JP6193213B2 (en) * | 2011-04-20 | 2017-09-06 | エクスポネンシャル テクノロジーズ,インコーポレイテッドExponential Technologies,Inc. | Rotor formed using involute curves |
US8887592B2 (en) | 2011-05-09 | 2014-11-18 | Exponential Technologies, Inc. | Spherical involute gear coupling |
CN104203058B (en) | 2012-02-08 | 2017-07-14 | 新璞修人有限公司 | Liquid distribution |
USD699475S1 (en) | 2013-02-28 | 2014-02-18 | Simplehuman, Llc | Soap pump |
USD770798S1 (en) | 2015-02-25 | 2016-11-08 | Simplehuman, Llc | Soap pump |
US10076216B2 (en) | 2015-02-25 | 2018-09-18 | Simplehuman, Llc | Foaming soap dispensers |
USD773848S1 (en) | 2015-03-06 | 2016-12-13 | Simplehuman, Llc | Liquid dispenser cartridge |
CA2922625A1 (en) | 2015-03-06 | 2016-09-06 | Simplehuman, Llc | Foaming soap dispensers |
USD785970S1 (en) | 2016-01-25 | 2017-05-09 | Simplehuman, Llc | Soap pump head |
ES2857923T3 (en) | 2017-03-17 | 2021-09-29 | Simplehuman Llc | Soap pump |
USD818741S1 (en) | 2017-03-17 | 2018-05-29 | Simplehuman, Llc | Soap pump |
KR20200108282A (en) | 2017-12-13 | 2020-09-17 | 엑스퍼넨셜 테크놀로지스 주식회사 | Rotary fluid flow device |
US11168683B2 (en) | 2019-03-14 | 2021-11-09 | Exponential Technologies, Inc. | Pressure balancing system for a fluid pump |
USD962672S1 (en) | 2020-08-26 | 2022-09-06 | Simplehuman, Llc | Dispenser |
USD967650S1 (en) | 2020-10-26 | 2022-10-25 | Simplehuman, Llc | Liquid dispenser |
US11918156B2 (en) | 2021-02-05 | 2024-03-05 | Simplehuman, Llc | Push-pump for dispensing soap or other liquids |
US11759060B2 (en) | 2021-02-08 | 2023-09-19 | Simplehuman, Llc | Portable consumer liquid pump |
Family Cites Families (28)
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US533292A (en) * | 1895-01-29 | Rotary blower | ||
US559703A (en) * | 1896-05-05 | Thomas w | ||
GB439908A (en) * | 1934-09-28 | 1935-12-17 | Brown David & Sons Ltd | Improvements in rotors for pumps and blowers |
US2462924A (en) * | 1944-03-01 | 1949-03-01 | Equi Flow Inc | Gear tooth profile |
US2447104A (en) * | 1944-08-30 | 1948-08-17 | Trbojevich Nikola | Variable leverage gearing |
US2701683A (en) * | 1951-12-15 | 1955-02-08 | Read Standard Corp | Interengaging rotor blower |
US3089638A (en) * | 1958-12-01 | 1963-05-14 | Dresser Ind | Impellers for fluid handling apparatus of the rotary positive displacement type |
DE1403934A1 (en) * | 1960-03-14 | 1969-01-16 | Reiners U Wiggermann Ohg | Adjustable gear displacement machine |
US3182900A (en) * | 1962-11-23 | 1965-05-11 | Davey Compressor Co | Twin rotor compressor with mating external teeth |
US3323499A (en) * | 1963-07-01 | 1967-06-06 | Gijbeis Peter Hendrik | Rotary combustion, respectively expansion engine |
DE2108714B2 (en) * | 1971-02-24 | 1973-05-30 | Gebr Wmkelstrater GmbH, 5600 Wuppertal Barmen | PARALLEL AND EXTERNAL ROTARY PISTON MACHINE |
US4003349A (en) * | 1974-09-18 | 1977-01-18 | Habsburg Lothringen Leopold V | Rotary piston engine |
US4145168A (en) * | 1976-11-12 | 1979-03-20 | Bobby J. Travis | Fluid flow rotating machinery of lobe type |
US4224015A (en) * | 1977-01-19 | 1980-09-23 | Oval Engineering Co., Ltd. | Positive displacement flow meter with helical-toothed rotors |
US4224016A (en) * | 1978-09-27 | 1980-09-23 | Brown Arthur E | Rotary positive displacement machines |
US4324538A (en) * | 1978-09-27 | 1982-04-13 | Ingersoll-Rand Company | Rotary positive displacement machine with specific lobed rotor profiles |
JPS5732091A (en) * | 1980-07-30 | 1982-02-20 | Nippon Air Brake Co Ltd | Gear pump or motor |
JPS6188071A (en) * | 1984-10-05 | 1986-05-06 | Mitsui Eng & Shipbuild Co Ltd | Method of correcting tooth shape of involute gear |
JPS6436992A (en) * | 1987-07-31 | 1989-02-07 | Fuji Heavy Ind Ltd | Roots blower |
GB2243651A (en) * | 1990-05-05 | 1991-11-06 | Drum Eng Co Ltd | Rotary, positive displacement machine |
US5154149A (en) * | 1991-04-05 | 1992-10-13 | Turner Leonard W | Rotary motor/pump |
JPH05296159A (en) * | 1992-04-20 | 1993-11-09 | Tokico Ltd | Rotor for positive displacement rotating machine |
JP3529209B2 (en) * | 1995-11-29 | 2004-05-24 | 株式会社オーバル | Helical gear |
JPH112191A (en) * | 1997-06-13 | 1999-01-06 | Shimadzu Corp | Gear pump or motor |
DE19725462A1 (en) * | 1997-06-16 | 1998-12-24 | Storz Endoskop Gmbh | Medical gear pump for suction and rinsing |
DE19819538C2 (en) * | 1998-04-30 | 2000-02-17 | Rietschle Werner Gmbh & Co Kg | Pressure suction pump |
GB9930265D0 (en) * | 1999-12-23 | 2000-02-09 | Masters R | Rotary engine |
DE10003735A1 (en) * | 2000-01-28 | 2000-11-16 | Bosch Gmbh Robert | Mechanical hydraulic pump has meshing gear wheels with asymmetric gear tooth edges to reduce pulsation in the output pressure |
-
2003
- 2003-08-20 FR FR0310040A patent/FR2859000B1/en not_active Expired - Fee Related
-
2004
- 2004-07-21 WO PCT/FR2004/001925 patent/WO2005021972A1/en active IP Right Grant
- 2004-07-21 JP JP2006523646A patent/JP4936888B2/en not_active Expired - Fee Related
- 2004-07-21 AT AT04785984T patent/ATE399266T1/en active
- 2004-07-21 US US10/568,585 patent/US8109748B2/en not_active Expired - Fee Related
- 2004-07-21 ES ES04785984T patent/ES2305859T3/en not_active Expired - Lifetime
- 2004-07-21 DE DE602004014625T patent/DE602004014625D1/en not_active Expired - Lifetime
- 2004-07-21 EP EP04785984A patent/EP1658437B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2005021972A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111197574A (en) * | 2018-11-20 | 2020-05-26 | 宿迁学院 | High-performance novel parabolic rotor for pump |
CN111197574B (en) * | 2018-11-20 | 2021-07-23 | 宿迁学院 | High-performance novel parabolic rotor for pump |
Also Published As
Publication number | Publication date |
---|---|
EP1658437B1 (en) | 2008-06-25 |
FR2859000B1 (en) | 2005-09-30 |
WO2005021972A1 (en) | 2005-03-10 |
US20070274853A1 (en) | 2007-11-29 |
JP2007502950A (en) | 2007-02-15 |
JP4936888B2 (en) | 2012-05-23 |
US8109748B2 (en) | 2012-02-07 |
FR2859000A1 (en) | 2005-02-25 |
ES2305859T3 (en) | 2008-11-01 |
ATE399266T1 (en) | 2008-07-15 |
DE602004014625D1 (en) | 2008-08-07 |
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