EP0769104B1 - Helical gear pump or motor - Google Patents
Helical gear pump or motor Download PDFInfo
- Publication number
- EP0769104B1 EP0769104B1 EP95943151A EP95943151A EP0769104B1 EP 0769104 B1 EP0769104 B1 EP 0769104B1 EP 95943151 A EP95943151 A EP 95943151A EP 95943151 A EP95943151 A EP 95943151A EP 0769104 B1 EP0769104 B1 EP 0769104B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gears
- gear
- teeth
- hydraulic apparatus
- hydraulic
- 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.)
- Expired - Lifetime
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
- F04C2/02—Rotary-piston machines or pumps of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
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- 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
- F04C2/16—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 helical teeth, e.g. chevron-shaped, screw type
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Gear Transmission (AREA)
- Hydraulic Motors (AREA)
Abstract
Description
Claims (20)
- Hydraulic apparatus having two intermeshing gears (8,10) having external helical teeth, mounted for rotation within a casing (2) between an inlet side and an outlet side, characterised in that substantially at the instant at which continuous driving contact is achieved across the entire width of a pair of co-operating teeth (32, 42), the leading end of the preceding tooth (31) of one gear (8) comes out of its engagement with the tooth (41) with which it is cooperating of the other gear (10) and wherein respective pressure relief recesses (70, 74) being provided which can communicate with the spaces between the teeth as they move into mesh at each end of the gears, the disposition of the pressure relief recess (70) at one end of the gears relative to that at the other end (74) thereof being staggered by an amount corresponding to the helical advance.
- Hydraulic apparatus as claimed in claim 1, wherein continuous driving contact is achieved across the entire width of a pair of intermeshing teeth (32, 42) slightly after the leading end of the preceding tooth (31A) of one gear (8) comes out of engagement with the tooth (41A) with which it is cooperating of the other gear (10).
- Hydraulic apparatus as claimed in claim 1, wherein continuous driving contact is achieved across the entire length of a pair of intermeshing teeth (32, 42) slightly before the leading end of the preceding tooth (31A) of one gear (8) comes out of engagement with the tooth (41A) with which it is cooperating of the other gear (10).
- Hydraulic apparatus as claimed in any preceding claim, wherein the contact ratio in the transverse plane is in the range 1.5-3 and exceeds the helical advance by 0.8-1.2.
- Hydraulic apparatus as claimed in claim 4, wherein the contact ratio in the transverse plane is in the range 1.85-2.2 and exceeds the helical advance by 0.95-0.99.
- Hydraulic apparatus as claimed in claim 5, wherein the contact ratio in the transverse plane is in the range 1.95-1.99 and the helical advance is 1.
- Hydraulic apparatus as claimed in any preceding claim, wherein each gear has at least 13 teeth.
- Hydraulic apparatus as claimed in claim 7, wherein each gear has at least 17 teeth.
- Hydraulic apparatus as claimed in any preceding claim, wherein the gear teeth have flanks of involute profile.
- Hydraulic apparatus as claimed in any preceding claim, being a gear pump.
- Hydraulic apparatus as claimed in any one of the claims 1 to 9, being a gear motor.
- Hydraulic apparatus as claimed in any preceding claim, wherein each pressure relief recess (70, 74) is a slot straddling the common tangent to the pitch circles of the gears and communicating at one end with the high pressure port (60) of the apparatus, the other end of said slot having a basic end surface (78, 82) beyond which there extends a subsidiary slot (80, 84) disposed wholly on that side of the contact line (52) remote from the power input or output gear (8, 10).
- Hydraulic apparatus as claimed in any preceding claim, comprising a gear pump wherein a fluid feed recess (72, 76) can communicate with the spaces between the teeth as they move out of mesh at each end of the gears, the pressure relief recess (70, 74) and the fluid feed recess (72, 76) at each end of the gears being so shaped and positioned as to avoid communication with each other by way of said spaces, and the disposition of the fluid feed recess (71) at one end of the gears relative to that (76) at the other end thereof being staggered by an amount corresponding to the helical advance.
- Hydraulic apparatus as claimed in claim 13, wherein each fluid feed recess (72, 76) is a slot interconnecting the bearings for the shafts carrying the gears (8, 10) and being spaced from the basic end surface (78, 82) of the associated pressure relief recess (70, 74) by an amount corresponding to the helical advance.
- Hydraulic apparatus as claimed in any preceding claim, wherein a basic end surface (78) of the pressure relief recess (70) at that end of the gears containing the leading ends (30A, 31A,... 40A, 41A,...) of their teeth is disposed in the plane (62) containing the axes of both gears.
- Hydraulic apparatus as claimed in claim 14 or claim 15, wherein at least the effective portions (88, 90) of those edges of the fluid feeds recesses (72, 76) adjacent to the pressure relief recesses (70, 74) are straight and at right angles to the common tangent (50) to the pitch circles of the gears.
- Hydraulic apparatus as claimed in claim 16, wherein at least the effective portion (90) of that edge of the fluid feed recess (76) at that end of the gears containing the trailing ends (30B, 31B,... 40B, 41B,...) of their teeth is disposed in the plane (62) containing the axes of both gears.
- Hydraulic apparatus as claimed in any preceding claim, comprising a reversible gear motor wherein respective pressure relief recesses communicate with both ports (50, 60) of the motor at each end of the gears (8, 10).
- Hydraulic apparatus as claimed in any preceding claim, wherein the recesses (70, 72, 74, 76) are formed in seal plates which are known per se for minimising leakage at the ends of the gears.
- A hydraulic system comprising a hydraulically powered apparatus requiring hydraulic fluid at a pressure of at least 10x106 Pa, a gear pump as claimed in any one of claims 13, 14, as well as 16, and 17 when dependent on claim 13 hydraulically coupled to said apparatus, and a prime mover coupled to said gear pump to operate said gear pump to pressurise hydraulic fluid to a pressure of a least 10 x 106 Pa.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9413676A GB9413676D0 (en) | 1994-07-07 | 1994-07-07 | Hydraulic apparatus |
GB9413676 | 1994-07-07 | ||
GBGB9506824.3A GB9506824D0 (en) | 1995-04-01 | 1995-04-01 | Hydraulic apparatus |
GB9506824 | 1995-04-01 | ||
PCT/GB1995/001610 WO1996001950A1 (en) | 1994-07-07 | 1995-07-07 | Helical gear pump or motor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0769104A1 EP0769104A1 (en) | 1997-04-23 |
EP0769104B1 true EP0769104B1 (en) | 1999-09-01 |
Family
ID=26305215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95943151A Expired - Lifetime EP0769104B1 (en) | 1994-07-07 | 1995-07-07 | Helical gear pump or motor |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0769104B1 (en) |
JP (1) | JP3972072B2 (en) |
KR (1) | KR970704968A (en) |
AT (1) | ATE184080T1 (en) |
AU (1) | AU2892895A (en) |
DE (1) | DE69511870T2 (en) |
GB (1) | GB2304155B (en) |
WO (1) | WO1996001950A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006014930U1 (en) * | 2006-09-28 | 2008-02-14 | Trw Automotive Gmbh | Hydraulic device |
US8556609B2 (en) | 2007-03-14 | 2013-10-15 | Mario Antonio Morselli | Geared hydraulic apparatus |
DE102013226852A1 (en) | 2013-12-20 | 2015-06-25 | Volkswagen Aktiengesellschaft | gear pump |
US9366250B1 (en) | 2013-06-27 | 2016-06-14 | Sumitomo Precision Products Co., Ltd. | Hydraulic device |
US9404366B2 (en) | 2009-10-30 | 2016-08-02 | Settima Meccanica S.R.L. | Gear wheel with profile capable of meshing with semi-encapsulation in a geared hydraulic apparatus |
EP3418571A1 (en) * | 2017-06-23 | 2018-12-26 | Hamilton Sundstrand Corporation | Gear pump with means for reduction of cavitation |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2312476B (en) * | 1996-04-24 | 1999-12-08 | Sauer Sundstrand Ltd | Pressure balance control in gear pumps |
DE19725462A1 (en) | 1997-06-16 | 1998-12-24 | Storz Endoskop Gmbh | Medical gear pump for suction and rinsing |
FR2772839B1 (en) * | 1997-12-19 | 2000-02-11 | Hydroperfect Int | FUEL PUMP, ESPECIALLY GASOLINE, IN PARTICULAR FOR THE DIRECT INJECTION OF FUEL INTO AN INTERNAL COMBUSTION ENGINE, ELECTRO-PUMP UNIT CONTAINING SUCH A PUMP AND AUTOMOTIVE VEHICLE EQUIPPED WITH AN ELECTRO-PUMP UNIT |
GB2336876B (en) * | 1998-04-29 | 2001-06-27 | Sauer Sundstrand Ltd | Separated helical gear pump |
US6739850B2 (en) * | 2001-10-25 | 2004-05-25 | Kyosan Denki Co., Ltd. | Motor-type fuel pump for vehicle |
US6887055B2 (en) | 2002-10-25 | 2005-05-03 | Mario Antonio Morselli | Positive-displacement rotary pump |
EP2303362B1 (en) * | 2008-07-18 | 2019-06-05 | Becton, Dickinson and Company | Dual chamber and gear pump assembly for a high pressure delivery system |
IT1396898B1 (en) * | 2008-12-02 | 2012-12-20 | Marzocchi Pompe S P A | TOOTHED PROFILE FOR VOLUMETRIC PUMP ROTORS WITH EXTERNAL GEARS. |
IT1398817B1 (en) | 2009-10-30 | 2013-03-21 | Morselli | TOOTHED WHEEL WITH PROFILE TO ENGAGE WITH SEMI-INCAPSULATION IN A GEAR HYDRAULIC EQUIPMENT |
JP5395631B2 (en) * | 2009-11-13 | 2014-01-22 | 上田鉄工株式会社 | Gear pump |
US9022761B2 (en) * | 2012-08-22 | 2015-05-05 | Roper Pump Company | Elliptical gear pump fluid driving apparatus |
CN102966537A (en) * | 2012-11-22 | 2013-03-13 | 无锡市东方液压件制造有限公司 | Helical gear oil pump suitable for automobile steering systems |
JP2014205129A (en) * | 2013-04-11 | 2014-10-30 | エース技研株式会社 | Liquid discharge unit |
CN103644115A (en) * | 2013-08-29 | 2014-03-19 | 钟文填 | Biarc screw pump |
JP2017223197A (en) * | 2016-06-17 | 2017-12-21 | 住友精密工業株式会社 | Hydraulic device |
DE102017207733A1 (en) * | 2017-05-08 | 2018-11-08 | Robert Bosch Gmbh | External gear machine, exhaust heat recovery system with an external gear machine |
IT201800005956A1 (en) * | 2018-06-01 | 2019-12-01 | VOLUMETRIC GEAR MACHINE WITH HELICAL TEETH | |
CN113348303B (en) * | 2019-03-08 | 2023-02-21 | 株式会社岛津制作所 | Helical gear pump or motor |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3209611A (en) * | 1961-05-02 | 1965-10-05 | Iyoi Hitosi | Teeth profiles of rotors for gear pumps of rotary type |
FR1355756A (en) * | 1963-02-07 | 1964-03-20 | Johannes Freres | Improved gear pump intended more particularly for public works machinery |
US4265606A (en) * | 1979-11-21 | 1981-05-05 | Lehnus Edward L | Fositive displacement pulse free rotary fluid pump |
US4548562A (en) * | 1982-09-07 | 1985-10-22 | Ford Motor Company | Helical gear pump with specific helix angle, tooth contact length and circular base pitch relationship |
US5108275A (en) * | 1990-12-17 | 1992-04-28 | Sager William F | Rotary pump having helical gear teeth with a small angle of wrap |
-
1995
- 1995-07-07 AT AT95943151T patent/ATE184080T1/en active
- 1995-07-07 DE DE69511870T patent/DE69511870T2/en not_active Expired - Lifetime
- 1995-07-07 JP JP50418896A patent/JP3972072B2/en not_active Expired - Lifetime
- 1995-07-07 AU AU28928/95A patent/AU2892895A/en not_active Abandoned
- 1995-07-07 KR KR1019970700047A patent/KR970704968A/en not_active Application Discontinuation
- 1995-07-07 GB GB9700560A patent/GB2304155B/en not_active Expired - Lifetime
- 1995-07-07 WO PCT/GB1995/001610 patent/WO1996001950A1/en not_active Application Discontinuation
- 1995-07-07 EP EP95943151A patent/EP0769104B1/en not_active Expired - Lifetime
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006014930U1 (en) * | 2006-09-28 | 2008-02-14 | Trw Automotive Gmbh | Hydraulic device |
US8512018B2 (en) | 2006-09-28 | 2013-08-20 | Trw Automotive Gmbh | Gear pump with pressure relief groove |
DE102007046420B4 (en) | 2006-09-28 | 2018-10-04 | Trw Automotive Gmbh | Hydraulic device |
US8556609B2 (en) | 2007-03-14 | 2013-10-15 | Mario Antonio Morselli | Geared hydraulic apparatus |
US9404366B2 (en) | 2009-10-30 | 2016-08-02 | Settima Meccanica S.R.L. | Gear wheel with profile capable of meshing with semi-encapsulation in a geared hydraulic apparatus |
US9366250B1 (en) | 2013-06-27 | 2016-06-14 | Sumitomo Precision Products Co., Ltd. | Hydraulic device |
DE102013226852A1 (en) | 2013-12-20 | 2015-06-25 | Volkswagen Aktiengesellschaft | gear pump |
EP3418571A1 (en) * | 2017-06-23 | 2018-12-26 | Hamilton Sundstrand Corporation | Gear pump with means for reduction of cavitation |
US10634135B2 (en) | 2017-06-23 | 2020-04-28 | Hamilton Sunstrand Corporation | Reduction of cavitation in gear pumps |
EP3882464A1 (en) * | 2017-06-23 | 2021-09-22 | Hamilton Sundstrand Corporation | Gear pump with means for reduction of cavitation |
Also Published As
Publication number | Publication date |
---|---|
AU2892895A (en) | 1996-02-09 |
GB2304155A (en) | 1997-03-12 |
GB2304155B (en) | 1998-08-19 |
JPH10502715A (en) | 1998-03-10 |
KR970704968A (en) | 1997-09-06 |
WO1996001950A1 (en) | 1996-01-25 |
DE69511870T2 (en) | 2000-05-04 |
DE69511870D1 (en) | 1999-10-07 |
ATE184080T1 (en) | 1999-09-15 |
EP0769104A1 (en) | 1997-04-23 |
GB9700560D0 (en) | 1997-03-05 |
JP3972072B2 (en) | 2007-09-05 |
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