US3679335A - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
US3679335A
US3679335A US21931A US3679335DA US3679335A US 3679335 A US3679335 A US 3679335A US 21931 A US21931 A US 21931A US 3679335D A US3679335D A US 3679335DA US 3679335 A US3679335 A US 3679335A
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US
United States
Prior art keywords
pump
gear
suction
guide wall
chamber
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
Application number
US21931A
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English (en)
Inventor
Christof Zippel
Manfred Ill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Application granted granted Critical
Publication of US3679335A publication Critical patent/US3679335A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04C2/10—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
    • F04C2/101—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 with a crescent-shaped filler element, located between the inner and outer intermeshing members

Definitions

  • ABSTRACT A gear pump having a power rotated pinion and an internal gear effecting positive displacement is provided including a filler or diverter element intermediate the toothed pumping [30] Foreign Application Priority Data March 21, 1969 Germany etc.
  • Such diverter comp recesses and avoids turbulence an stantially decreasing pump noise, particularly at h
  • the invention comprises a pump body having a circular aperture with walls encompassing the internally toothed gear, the body being co-axial with the shaft on which the pinion or drive gear of the pump is mounted for rotation and the aperture being eccentric of such common axis in accordance with usual practice.
  • a diverter element is utilized substantially closing such space for most of its crescent shape and being likewise of crescent shape.
  • Such flow diverter element has an arcuate surface or concavity smoothly contiguous with the circumferential ends of the teeth of the pinion gear and an outer arcuate surface or convexity smoothly contiguous with the radially extending inner ends of the teeth of the internal gear. Accordingly, as the gears rotate, the diverter element being fixed to the pump body, the recesses between the teeth of the two gears are closed off in sweeping past the respective arcuate sides of the diverter element.
  • the diverter element is disposed so that one end aligns smoothly with pump suction chamber walls to direct flow therefrom to the spacings between the teeth of the pinion gear. The spacings become filled with the medium being pumped and carry such medium around to the outlet chamber with a minimum of turbulence and cavitation.
  • the spacings between the teeth of the internal gear moving through the suction chamber are filled by the tangential movement of the liquid, a centrifugal force effect, such flow being tangential of the rotation of the pinion gear while at the same time moving outwardly radially in a well known manner.
  • the recesses of the internal gear are then virtually sealed off in sweeping past the convex side of the diverter element and turbulence and cavitation are avoided not only in the filling of such recesses but in the movement of the trapped oil charges therein.
  • FIG. I is a cross section radial view taken on line l-l of FIG. 3 showing the essential components of the invention.
  • FIG. 2 is a perspective of the diverter element
  • FIG. 3 is a fragmentary radial section showing a portion of the pump body and lid, taken on section line 3-3 of FIG. 1.
  • the invention comprises a pump body 3 of circular construction having a circular pump chamber eccentrically disposed in which is concentrically mounted a drive shaft 12 to which is keyed the pump pinion gear 2 having teeth meshing with the pump internal gear 1 which has rotative bearing support in the internal periphery of the chamber.
  • a crescent shape opening is effected and in the case of the invention this opening is filled by a diverter element 4 of corresponding crescent shape beginning at the upstream side of the pump with a suction flow guide wall 10 and ending at the downstream side of the pump with an end wall 9.
  • the element 4 will be understood to be suitably secured to the pump body 3 at the closed end of the pump chamber as by screws (not shown) coming through that wall and into element 4.
  • the pump body is open at the face viewed in FIG. 1, to be closed by a lid L (FIG. 3) fastened as by screws 7 to the pump body and having a collar 8 which closely fits the outer periphery of the pump body.
  • the axis of the pump body is also the axis of the arcuate surface of diverter element 4 concavely contiguous with the ends of the teeth of the pump pinion gear whereby the recesses 2I intermediate the teeth are isolated as the gear rotates in the direction of the curved arrow.
  • the convex side of filler element 4 isolates the pockets ll of the internal gear element as they move therepast.
  • the pump body is provided with a suction bore communicatingin a conventional manner with a suction chamber 5ll machined into the closed wall of the pump chamber, and it will be understood that the lid has'a similar and congruous suction chamber Slll recessed therein which is the mirror image of that shown on FIG. 1 in dashed lines, so that the medium being pumped can enter the suction region 5! between the gears from opposite axial directions.
  • Fluid medium flowing through the suction chamber is divided by the filler element into two partial flows, one of which passes through the pockets II and the other one through the pockets 21. Both partial flows are carried around and join each other in the pressure chamber 61. From there, fluid is transported to exhaust recesses such as 6Il machined into the end wall of the pump chamber and into the corresponding mirror image recess (not shown) in the lid understood to cover the open face of the pump. These pressure or exhaust recesses communicate with the outlet bore 6 through the pump body.
  • the flow guide wall is further defined by the plane thereof being at an angle B, which is greater than 90, such angle being a tangent to the periphery of the pinion gear to the radially outer end of the guide wall, at the tangential point X, of the pinion gear.
  • the effect of the invention is still improved by disposing the end wall 10] of the suction recess 5" to be in the same plane as the guide wall 10, or to fit smoothly thereto. It will be appreciated that the suction recess 5111 provided in the lid likewise has an end wall being shaped in conformance with the end wall 101.
  • -Wall 10 may be either flat or curved.
  • Wall 10, as viewed in FIG. 1, is flat and in a plane perpendicular to the plane of the paper.
  • FIG. 2 shows a diverter element having a suction end guide wall III which is inclined to the plane perpendicular to the drawing plane of FIG. 1, thus avoiding pressure shocks each time when a tooth of pinion gear 2 is entering into the circular range of face 10 of the filler element.
  • a gear pump comprising a pump body having a pump chamber; an internal gear in said chamber and a pinion gear in said chamber off center of said internal gear and meshing therewith whereby a generally crescent shaped space is effected intermediate the teeth of said gears; means comprising a substantially crescent shaped member disposed in said space as a filler therefore to divide said pump body into a suction region and a pressure region; said member having an end providing a suction flow guide wall for guiding suction flow to the spacings between the teeth of said pinion gear from said suction region for delivery to said pressure region; the plane of said flow guide wall being at an angle ([3) substantially smaller than 90 with the tangent of the tooth periphery of the pinion gear at the radially inner end of said guide wall, and the angle ([3,) of the plane of said guide wall with a tangent from said pinion gear to the outer end of said guide wall being greater than 90.
  • a gear pump as set forth in claim 3 a closure lid for said pump, body having a suction chamber recessed therein and disposed at the opposite side of said suction region and having an end wall in planar alignment with said flow guide wall of said member. 5

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
US21931A 1969-03-21 1970-03-23 Gear pump Expired - Lifetime US3679335A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691914444 DE1914444C3 (de) 1969-03-21 1969-03-21 Zahnradpumpe

Publications (1)

Publication Number Publication Date
US3679335A true US3679335A (en) 1972-07-25

Family

ID=5728879

Family Applications (1)

Application Number Title Priority Date Filing Date
US21931A Expired - Lifetime US3679335A (en) 1969-03-21 1970-03-23 Gear pump

Country Status (5)

Country Link
US (1) US3679335A (de)
JP (1) JPS5120724B1 (de)
DE (1) DE1914444C3 (de)
FR (1) FR2035140B1 (de)
GB (1) GB1269745A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645441A (en) * 1984-04-12 1987-02-24 Aisin-Warner Limited Internal-gear pump with partition plate having a chamfered edge
US6672850B2 (en) * 2001-12-21 2004-01-06 Visteon Global Technologies, Inc. Torque control oil pump with low parasitic loss and rapid pressure transient response
US20100143175A1 (en) * 2008-12-10 2010-06-10 Zf Friedrichshafen Ag Internal gear pump with optimized noise behaviour
US20100322810A1 (en) * 2007-11-16 2010-12-23 Rene Schepp Pump assembly for synchronous pressurization of two fluid circuits
JP2013170497A (ja) * 2012-02-20 2013-09-02 Tokiko Techno Kk ポンプユニット
US10905973B2 (en) * 2013-02-27 2021-02-02 C.C. Jensen A/S Device for processing a liquid under vacuum pressure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410015C2 (de) * 1984-03-19 1995-09-28 Schwaebische Huettenwerke Gmbh Innenläuferzahnradölpumpe für Kraftfahrzeugmotoren und automatische Kraftfahrzeuggetriebe
DE3445454A1 (de) * 1984-12-13 1986-06-26 P.I.V. Antrieb Werner Reimers GmbH & Co KG, 6380 Bad Homburg Mehrstufige innenverzahnte zahnradpumpe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1768818A (en) * 1927-12-15 1930-07-01 Oscar L Bock Internal-gear pump
US2433360A (en) * 1945-01-25 1947-12-30 Hiram H Haight Gear pump
US2544144A (en) * 1947-05-07 1951-03-06 Gen Motors Corp Oil burner pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1864459A (en) * 1932-06-21 norviel
FR693382A (fr) * 1930-04-04 1930-11-19 Perfectionnements apportés aux pompes rotatives, aux compresseurs et aux machines analogues
US2774309A (en) * 1953-08-14 1956-12-18 Sundstrand Machine Tool Co Pump
GB967944A (en) * 1962-04-06 1964-08-26 Daimler Benz Ag Improvements relating to gear pumps
GB1035529A (en) * 1963-08-12 1966-07-13 Lucas Industries Ltd Gear pumps
US3291060A (en) * 1966-03-21 1966-12-13 Lucas Industries Ltd Gear pumps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1768818A (en) * 1927-12-15 1930-07-01 Oscar L Bock Internal-gear pump
US2433360A (en) * 1945-01-25 1947-12-30 Hiram H Haight Gear pump
US2544144A (en) * 1947-05-07 1951-03-06 Gen Motors Corp Oil burner pump

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645441A (en) * 1984-04-12 1987-02-24 Aisin-Warner Limited Internal-gear pump with partition plate having a chamfered edge
US6672850B2 (en) * 2001-12-21 2004-01-06 Visteon Global Technologies, Inc. Torque control oil pump with low parasitic loss and rapid pressure transient response
US20100322810A1 (en) * 2007-11-16 2010-12-23 Rene Schepp Pump assembly for synchronous pressurization of two fluid circuits
US20100143175A1 (en) * 2008-12-10 2010-06-10 Zf Friedrichshafen Ag Internal gear pump with optimized noise behaviour
US8579618B2 (en) 2008-12-10 2013-11-12 Zf Friedrichshafen Ag Internal gear pump with optimized noise behaviour
JP2013170497A (ja) * 2012-02-20 2013-09-02 Tokiko Techno Kk ポンプユニット
US10905973B2 (en) * 2013-02-27 2021-02-02 C.C. Jensen A/S Device for processing a liquid under vacuum pressure

Also Published As

Publication number Publication date
FR2035140A1 (de) 1970-12-18
DE1914444A1 (de) 1970-10-08
FR2035140B1 (de) 1975-12-26
DE1914444B2 (de) 1972-12-07
DE1914444C3 (de) 1973-06-28
GB1269745A (en) 1972-04-06
JPS5120724B1 (de) 1976-06-28

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