EP1370771A1 - Self-centering gear pump - Google Patents

Self-centering gear pump

Info

Publication number
EP1370771A1
EP1370771A1 EP20020724189 EP02724189A EP1370771A1 EP 1370771 A1 EP1370771 A1 EP 1370771A1 EP 20020724189 EP20020724189 EP 20020724189 EP 02724189 A EP02724189 A EP 02724189A EP 1370771 A1 EP1370771 A1 EP 1370771A1
Authority
EP
European Patent Office
Prior art keywords
gear
drive shaft
drive
drive gear
pump
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Withdrawn
Application number
EP20020724189
Other languages
German (de)
French (fr)
Inventor
Dieter Brox
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.)
Buchrucker Karl
Original Assignee
Buchrucker Karl
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
Priority to DE2001114148 priority Critical patent/DE10114148C1/en
Priority to DE10114148 priority
Application filed by Buchrucker Karl filed Critical Buchrucker Karl
Priority to PCT/EP2002/002253 priority patent/WO2002077458A1/en
Publication of EP1370771A1 publication Critical patent/EP1370771A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10Rotary-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
    • F04C2/103Rotary-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 one member having simultaneously a rotational movement about its own axis and an orbital movement

Abstract

The invention relates to a self-centering gear pump, in particular for conveying and metering free-flowing pastes and liquids, but operating within various temperature ranges during the conveying process by means of a drive gear mounted axially on a central smooth motor shaft without a positive-fit connection and an excentrically located hollow gear that meshes on its interior face and rotates within a cylindrical housing. Said housing is closed on both sides by lateral walls.

Description


  



   Self-centering gear pump
The invention relates to a self-centering gear pump, in particular for conveying and metering flowable pastes and liquids, but in a wide variety of temperature ranges during the conveying process, by means of an externally toothed plastic drive gear, which is plugged onto a centrally arranged, smooth motor shaft, without a positive connection, and a ring gear meshing eccentrically with the motor shaft all around within a circular housing, which is closed on both sides by housing side walls, but is slidingly in contact with the ring gear and the inner side of the ring gear and the drive gearwheel with little running play, the side wall facing away from the motor containing an inlet and an outlet opening for the passage of the liquids through the pump.



  In this type of machine with a flywheel ring gear and a stationary rotating drive gear, special means and precautions are required to achieve optimum conveying accuracy.



  It is known, for example, that the ring gear and drive gear seal by means of stone walls laterally loaded with spring force (DE 451437 C). In other machines with vertical installation, the dead load of the rotating rotor seals (US 1,631,592).



  However, since the rotating displacement elements should also rotate for non-lubricating liquids and in the case of greater thermal expansion for the sake of easy mobility, a special gradation of pumps for different temperature ranges is absolutely necessary.



  The invention specified in claim 1 is based on the object of designing a self-centering gear pump which can self-priming, flowable pastes and non-lubricating liquids even when used in a wide variety of temperature ranges and metered.



  This object is solved by the features of claim 1.



  A preferred embodiment of the invention results from the features of claim 2.



  With increasing thermal expansion even with larger temperature differences, the claim 1 of the invention enables a constant functionality with expansion coefficients of the same material, whereby an axial thrust with longitudinal expansion of the drive shaft 3 is not transmitted to the drive gear 4 carried by it. Radial thermal expansion of the drive gear 4 and the floating ring gear 8 is absorbed and compensated for by the existing suction-side clearance 16 within the slot-shaped housing interior.



  Axially and radially, the rotating toothing elements can slide and position themselves in their optimal position for every temperature range during the work process.



  The self-centering gear pump consists of a circular housing interior which is designed slightly as an elongated hole between the central axis 17 and 18 and in which a rotatable, centrally mounted smooth drive shaft 3 carries an axially displaceable drive gear 4 made of plastic without a positive connection. When the smooth drive shaft 3 rotates in the direction of the arrow about the fixed center point 5, the resulting torque is abruptly used by means of a roller freewheel 6 for the non-positive connection between the drive shaft 3 and gear hub 7 within the drive gear 4 and takes it into its rotational movement in accordance with the direction of rotation.



  The drive gear 4, which is constantly meshed with the overhung internal gear ring 8, which has one more tooth, makes a circular orbital movement around the fixed center 5, while at the same time encircling the ring gear 8 inside the wall of the semicircle 10 in the housing inner wall slides.



  The difference in the number of teeth 1 between the drive gear 4 and the ring gear 8 causes a relative movement between the two, as a result of which constantly changing cavities 11 are formed which expand on the suction side from zero to the greatest extent and decrease on the pressure side again to zero, which has the effect that Conveying liquid is sucked into the pump interior via the pump inlet 12 and the overflow channel 13 and is displaced again on the pressure side through the overflow channel 14 to the pump outlet 15.



  The invention is explained in more detail below using an exemplary embodiment and illustrated with the aid of drawings.



  Figure 1 shows a sectional view of the front view of a self-centering gear pump.



  Figure 2 shows a front view of a self-centering gear pump with lying on housing cover.



  Figure 3 shows a sectional view in the course A-A of Figure 2 of a self-centering gear pump.



  By driving the smooth drive shaft 3 in the direction of the arrow around the fixed center point 5, the resulting torque abruptly establishes the non-positive connection between the drive shaft 3 and the gear hub 7 by means of the roller freewheel 6 and the axially attached drive gear 4 and brings the drive gear 4 into a rotational movement. Via the permanent tooth engagement 9, the internal toothed ring gear 8, which has one more tooth, is also rotated in a sliding manner along the inner-walled semicircle 10 of the housing 1.

   The difference in the number of teeth 1 between the drive gear 4 and the ring gear 8 generates a relative movement between the two and forms cavities 11 which expand their volume on the suction side from zero to the greatest extent and reduce it again on the pressure side to zero, which causes the liquid to be pumped through the pump inlet 12 and the overflow channel 13 is sucked into the interior of the pump and is displaced on the pressure side by the overflow channel 14 to the pump outlet 15.

Claims

 1. Self-centering gear pump with the following features: a) in a cylindrical housing (1) through a smooth, circular, rotatably mounted drive shaft (3) an axially attachable to the gear hub (7) Drive gear (4) made of plastic; b) the drive gear (4) with a non-positive connection to the gear hub (7) is not releasably connected; c) by driving the drive shaft (3) around the fixed center point (5), a torque created by means of the roller freewheel (6) suddenly creates the force-locking connection between the drive shaft (3) and the gear hub (7), the rollers of the roller freewheel (6 ) cling to the smooth surface of the drive shaft (3) over the entire circumference, but when the Release drive shaft (3) again;
 d) the constant tooth meshing (9) becomes one more tooth Ring gear (8) sliding along the inner-walled semicircle (10) within the Housing (1) in a relative rotational movement to the driving drive gear (4); e) the cylindrical housing (1) has a circular slightly than Elongated housing interior in which the inner wall between the central axes (17) and (18) is formed as a short straight line; f) in the case of operational material heating, radial thermal expansions from the elastic ring gear (8) or
 Drive gear (4) in the available space (16) shifted and compensated; g) an axial longitudinal expansion when the drive shaft (3) heats up, when the roller freewheel (6) is used, the axial displacement possibility of the drive gear (4) on the smooth drive shaft (3) is used to compensate for the linear expansion; Second
 Self-centering gear pump with the following features: a) in a cylindrical housing (1) through a smooth, circular, rotatably mounted drive shaft (3) an axially attachable to the gear hub (7) Drive gear (4) made of plastic; b) the drive gear (4) with a non-positive connection to the gear hub (7) is not releasably connected; c) by driving the drive shaft (3) in the direction of the arrow around the fixed center point (5), a torque created by means of a roller freewheel (6) abruptly creates the positive connection between the drive shaft (3) and Gear hub (7) forth, the rollers of the roller freewheel (6) clinging over the entire circumference on the smooth surface of the drive shaft (3), but loosening when the drive shaft (3) is at a standstill;
 d) over the constant meshing (9) the one tooth more having ela stical ring gear (8) sliding along the inner semicircle (10) inside half of the housing (1) in a relative rotary motion to the driving gear (4); e) the drive gear (4) to the ring gear (8) has a difference in the number of teeth of 1, the semicircular tooth geometry of the drive gear (4) being positive and that of the ring gear (8) being a negative shape; the cylindrical housing (1) has a circular slightly as Elongated housing interior in which the inner wall between the central axes (17) and (18) is formed as a short straight line; g) in the case of operational material heating, radial thermal expansions from the elastic ring gear (8) or
 Drive gear (4) in the available space (16) shifted and compensated; h) an axial longitudinal expansion when the drive shaft (3) heats up is used when the roller freewheel (6) is used by the axial displacement possibility of the drive gear (4) on the smooth drive shaft (3) to compensate for the linear expansion; i) forms the relative movement between the drive gear (4) and ring gear (8) Cavities (11), which expand their volume on the suction side from zero to the greatest expansion and reduce the volume on the pressure side again to zero;
    j) the suction-side enlargement of the cavities (11) causes that to be promoted Liquid through the pump inlet (12) via the overflow channel (13) into the Pump interior is sucked; k) the pressure-side reduction of the cavities (11) has the effect that the liquid to be conveyed is displaced again via the pressure-side overflow channel (14) through the pump outlet (15).
3. Self-centering gear pump according to claim 1 or claim 2, characterized in that the rotating toothed parts drive gear (4) and hollow wheel (8) have the same material expansion coefficient as the housing (1).
EP20020724189 2001-03-22 2002-03-01 Self-centering gear pump Withdrawn EP1370771A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2001114148 DE10114148C1 (en) 2001-03-22 2001-03-22 Self-centering gearwheel pump, especially for flowable pastes and fluids, includes driving gearwheel axially fitted non-positively on smooth drive shaft and with eccentric hollow wheel to compensate radial heat expansions
DE10114148 2001-03-22
PCT/EP2002/002253 WO2002077458A1 (en) 2001-03-22 2002-03-01 Self-centering gear pump

Publications (1)

Publication Number Publication Date
EP1370771A1 true EP1370771A1 (en) 2003-12-17

Family

ID=7678638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020724189 Withdrawn EP1370771A1 (en) 2001-03-22 2002-03-01 Self-centering gear pump

Country Status (5)

Country Link
US (1) US20040136856A1 (en)
EP (1) EP1370771A1 (en)
CA (1) CA2441596A1 (en)
DE (1) DE10114148C1 (en)
WO (1) WO2002077458A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108916628B (en) * 2018-07-10 2019-12-31 浙江平柴泵业有限公司 Efficient oil pump

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE451437C (en) * 1924-03-14 1927-10-27 Hill Compressor And Pump Co In Side seal for gear pumps with compressors or eccentrically one inside the other gear wheels
US1631592A (en) * 1926-09-01 1927-06-07 Hill Compressor & Pump Company Rotary pumping machine
US2434135A (en) * 1942-12-02 1948-01-06 Eaton Mfg Co Gear pump structure
AT174800B (en) * 1952-01-15 1953-05-11 Benno Fiala-Fernbrugg gear pump
US3958494A (en) * 1974-09-30 1976-05-25 Moog Inc. Multiple displacement hydraulic motor drive apparatus
DE19651683A1 (en) * 1996-12-12 1998-06-18 Otto Eckerle Internal gear pump without filler
DE19710804A1 (en) * 1997-03-17 1998-09-24 Geraete Und Pumpenbau Gmbh Gear pump for conveying fluids
DE29810548U1 (en) * 1998-06-16 1998-12-17 Joma Polytec Gmbh Gear for a gear pump
JP2001132660A (en) * 1999-11-09 2001-05-18 Jatco Transtechnology Ltd Al ALLOY INSCRIBED GEAR TYPE OIL PUMP HAVING STRUCTURAL MEMBER FOR EXHIBITING SMALL OPPONENT ATTACKING PROPERTY AND EXCELLENT ABRASION RESISTANCE
JP2001214869A (en) * 2000-01-31 2001-08-10 Sumitomo Electric Ind Ltd Oil pump
US6749272B2 (en) * 2001-08-09 2004-06-15 Denso Corporation Rotary pump with higher discharge pressure and brake apparatus having same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02077458A1 *

Also Published As

Publication number Publication date
DE10114148C1 (en) 2002-06-06
CA2441596A1 (en) 2002-10-03
WO2002077458A1 (en) 2002-10-03
US20040136856A1 (en) 2004-07-15

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