EP0484201A1 - Hydraulische Zahnradpumpe oder -motor für Wasserbetrieb - Google Patents

Hydraulische Zahnradpumpe oder -motor für Wasserbetrieb Download PDF

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Publication number
EP0484201A1
EP0484201A1 EP91402818A EP91402818A EP0484201A1 EP 0484201 A1 EP0484201 A1 EP 0484201A1 EP 91402818 A EP91402818 A EP 91402818A EP 91402818 A EP91402818 A EP 91402818A EP 0484201 A1 EP0484201 A1 EP 0484201A1
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EP
European Patent Office
Prior art keywords
bearings
water
pump
thermoplastic
pinions
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Withdrawn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
EP91402818A
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English (en)
French (fr)
Inventor
Michel Bavouzet
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0484201A1 publication Critical patent/EP0484201A1/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to the design of a hydraulic pump and (or) gear motor, dru type consisting of two pinions with external teeth, allowing operation with water, medium and high pressure.
  • pumps and (or) hydraulic gear motor of the same type operating with mineral oil, of which generally, the bodies and bearings are manufactured in an aluminum alloy, and, the shafts and pinions in a treated steel.
  • These pumps and / or motors allow high performance in pressure and / or in torque, and in rotation speed, thanks to their operation with mineral oil, but they cannot operate with water, all d first because the materials used are oxidizable, but also because it is mineral oil which, in addition to its anti-corrosion function, provides lubrication to prevent the pinions from seizing together and on the inside faces of the bearings, as well as the seizure of trees in their cavities.
  • the use of mineral oil in the event of a leak in the hydraulic circuit has drawbacks, for example: for use in a food product factory because of the toxicity of the oil, or even in a textile factory because of the risk of soiling, or even in sites where the risk of flammability of mineral oil poses a danger.
  • the water-operated hydraulic gear pump and / or motor according to the invention makes it possible, on sites where hydraulic oil-operated pumps and / or motors operating with mineral oil are currently used, and where, in the event of a leak in a hydraulic circuit, mineral oil presents a risk of soiling, toxicity, or flammability, to remedy these drawbacks and dangers, by using pure water.
  • the invention solves the problem of creating a hydraulic pump and / or gear motor, of the type consisting of two pinions with external teeth, allowing operation in water, in medium and high pressure.
  • All the parts making up the pump and / or hydraulic gear motor working with water, at medium and high pressure are made of specific materials, on the one hand completely stainless in the mass, on the other hand allowing operation without lubrication with mineral oil thanks to the physical characteristics of the materials used and associated for the manufacture of the various friction parts.
  • the water-operated gear pump and (or) hydraulic motor is manufactured in different models, the size of which varies according to the displacement.
  • variants concerning the pinions, and the bearings allow an adaptation responding to the specific constraints linked to the various possible uses: either significant mechanical constraints and low rotation speed, or significant mechanical constraints and rapid rotation speed, either weight constraints of the pump and / or motor and low mechanical stresses.
  • the front body, the central body and the rear body are made of a thermoplastic offering resistance to hydrolysis and good mechanical strength up to a temperature of 250 ° C.
  • the pinion shafts are made of stainless steel treated by quenching and tempering, and ground, to rotate in the bearing cavities.
  • the driving pinion and the driven pinion are made of treated stainless steel by quenching and tempering, and ground on the sides and top of teeth, to rotate between the bearings made of a thermoplastic offering great wear resistance, a very low dynamic coefficient of friction, resistance to hydrolysis and to creep, good mechanical strength up to a temperature of 250 ° C., and the surfaces of the interior faces of which are rectified.
  • the driving pinion is made in stainless steel treated by quenching and tempered, and rectified, and the driven pinion is made in hard bronze and the sides and top surfaces of the teeth are ground to rotate between bearings made of thermoplastic, offering high wear resistance, very low dynamic friction coefficient, resistance to hydrolysis and creep, good mechanical strength up to a temperature of 250 ° C, and the surfaces of the interior faces are rectified.
  • the driving and driven pinions are manufactured in the thermoplastic offering a great resistance to wear, a coefficient of dynamic friction very bottom, resistance to hydrolysis and creep, good mechanical strength up to a temperature of 250 ° C and the surfaces of the sides and top of the teeth are ground, to rotate between the bearings made of treated stainless steel by quenching and tempering and rectified on the surfaces of the interior faces.
  • the cavities of these bearings intended to receive the pinion shafts are machined in the thermoplastic so as to allow the rotation of the pinion shafts directly in the thermoplastic.
  • the shafts, the top of the toothing and the sides of the gables, as well as the interior faces of the bearings are in all cases rectified in order to obtain perfect quality of the surface conditions, on the one hand making it possible to limit the interior leaks linked to the fluidity of water, and on the other hand allow the creation of a film of water between the friction surfaces.
  • This drawing represents an "exploded view” according to the invention a hydraulic pump and / or gear motor, of the type consisting of two pinions with external teeth, allowing operation with water, at medium and / or high pressure.
  • This pump and / or motor is composed of a front body (1), a central body (2), a rear body (3), a driving pinion (5) provided with its shaft (6 ), a driven pinion (7) provided with its shaft (8), two bearings (4), the outer faces of which have grooves (9) each intended to receive a pressure compensation joint (10) and which also compensates for the expansion of the parts, an anti-extrusion seal (11), a rotating shaft seal (12) and its retaining circlips (13) intended to ensure the seal on the shaft (6) of the driving pinion (5) at its exit from the front body (1), of two seals (14) intended to seal between the bodies (1), (2) and (3) mounted on the using the centering pins (15) and tightened using the bolts (16) passing through the central body (2) and screwed into the inner face of the front body (1), holes (17) reserved for the fixing of the pump and / or motor on its support during of its commissioning.
  • the general operating principle is identical to that of hydraulic gear pumps and / or motors operating with mineral oil: in the pump function, a heat or electric motor rotates the pinions (5) and (7) by transmitting its torque to the shaft (6) of the driving pinion, the driving pinion (5) drives the driven pinion (7), and the gear thus formed, by rotating causes suction at the inlet of the pump and pressure at the exit; in the motor function, water is injected under pressure through the motor inlet port and thus rotates the two pinions (5) and (7) to exit the opposite port, the gear transmits its torque by through the drive pinion shaft (6).
  • thermoplastic chosen for the manufacture of these parts must imperatively offer the above characteristics, in order to avoid any deformation of these parts either by absorption of water, or by the constraints related to the pressure necessary for the operation, or by the constraints related to the temperature due to the heating of the various parts in friction and possibly increased in the case of operation with hot water.
  • These three parts are molded or machined, and the surface of the interior faces of the front (1) and rear (3) bodies as well as the corresponding faces of the central body (2) and its interior surfaces are rectified if necessary to allow perfect adaptation of the different rooms.
  • the pinions (5) and (7) are positioned, without play, in the central body (2), these therefore go from the first instants of operation "lapping" inside the central body (2), thus the internal leaks between the toothing (20) necessarily corrected of the pinions (5) and (7) and the central body (2) are limited. For this reason the interior of the central body (2) cannot be coated with a surface treatment intended to protect it from corrosion or to promote friction, this would be immediately degraded.
  • the pinion shafts (6) and (8) are machined from stainless steel treated by quenching and tempering, and ground, to rotate in the cavities (18) of the bearings (4). They are mounted respectively on their pinions (5) and (7) by nitrogen cooling.
  • the driving pinion (5) is made in stainless steel treated by quenching and tempering, and rectified, and the driven pinion (7) is made in a hard bronze and the surfaces of the sides (19) and of the toothing (20) are rectified, to rotate between the bearings (4) made of thermoplastic, offering: high wear resistance, a very dynamic coefficient of friction low, resistance to hydrolysis and creep, good mechanical strength up to a temperature of 250 ° C.
  • the method of manufacturing the driven pinion (7) in hard bronze is identical to that of the pinions in stainless steel.
  • the driving sprockets (5) and driven (7) are made of thermoplastic offering: high wear resistance , a very low dynamic friction coefficient, resistance to hydrolysis and creep, good mechanical strength up to a temperature of 250 ° C and the surfaces of the sidewalls (19) and top of the toothing (20) are rectified , to rotate between the bearings (4) made of stainless steel treated by quenching and tempering and ground on the surfaces of the interior faces.
  • the driving sprockets (5) and driven (7) are made of the same thermoplastic as the bearings (4) corresponding to the previous adaptations.
  • thermoplastic favoring the criterion of mechanical characteristics for the manufacture of the pinions and a thermoplastic favoring the performances in dynamic coefficient of friction for the manufacture of the bearings.
  • the sprockets in the thermoplastic are molded or machined and ground.
  • the bearings (4) machined in stainless steel being intended for operation with the pinions (5) and (7) manufactured in the thermoplastic, therefore for use with low mechanical stresses, have a thickness considerably reduced for reasons of size and weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP91402818A 1990-10-22 1991-10-22 Hydraulische Zahnradpumpe oder -motor für Wasserbetrieb Withdrawn EP0484201A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9013027A FR2668208A1 (fr) 1990-10-22 1990-10-22 Pompe et (ou) moteur hydraulique a engrenage fonctionnant a l'eau.
FR9013027 1990-10-22

Publications (1)

Publication Number Publication Date
EP0484201A1 true EP0484201A1 (de) 1992-05-06

Family

ID=9401435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402818A Withdrawn EP0484201A1 (de) 1990-10-22 1991-10-22 Hydraulische Zahnradpumpe oder -motor für Wasserbetrieb

Country Status (2)

Country Link
EP (1) EP0484201A1 (de)
FR (1) FR2668208A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0947699A1 (de) * 1994-09-01 1999-10-06 Fluid Management, Inc. Zahnradpumpe
WO2007140679A1 (en) * 2006-05-30 2007-12-13 Lingyu Dong A gear pump
CN107762718A (zh) * 2016-08-16 2018-03-06 博罗承创精密工业有限公司 一种气动马达

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB548998A (en) * 1941-11-18 1942-11-02 James Aitken Kinnaird Improvements in and relating to rotary gear wheel pumps
GB578057A (en) * 1944-04-05 1946-06-13 Stothert & Pitt Ltd Improvements in screw displacement pumps
US2772638A (en) * 1950-09-13 1956-12-04 John L Nagely Gear pump or motor
GB1329969A (en) * 1969-12-12 1973-09-12 Bradley Ltd G & E Gear pumps
JPS57151087A (en) * 1981-03-12 1982-09-18 Matsushita Electric Ind Co Ltd Gear pump
EP0147567A2 (de) * 1983-11-10 1985-07-10 Fresenius AG Zahnradpumpe, insbesondere für medizinische Zwecke

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966860A (en) * 1957-04-03 1961-01-03 Lobee Pump & Machinery Co Pump for corrosive fluids
DE2114874A1 (de) * 1971-03-27 1972-10-12 Dowty Technical Developments Ltd., Brockhampton, Cheltenham (Großbritannien) Hydraulische Verdrängungspumpe
DE3312868C2 (de) * 1983-04-09 1986-03-20 Glyco-Antriebstechnik Gmbh, 6200 Wiesbaden Hydropumpe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB548998A (en) * 1941-11-18 1942-11-02 James Aitken Kinnaird Improvements in and relating to rotary gear wheel pumps
GB578057A (en) * 1944-04-05 1946-06-13 Stothert & Pitt Ltd Improvements in screw displacement pumps
US2772638A (en) * 1950-09-13 1956-12-04 John L Nagely Gear pump or motor
GB1329969A (en) * 1969-12-12 1973-09-12 Bradley Ltd G & E Gear pumps
JPS57151087A (en) * 1981-03-12 1982-09-18 Matsushita Electric Ind Co Ltd Gear pump
EP0147567A2 (de) * 1983-11-10 1985-07-10 Fresenius AG Zahnradpumpe, insbesondere für medizinische Zwecke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 256 (M-179)[1134], 15 décembre 1982; & JP-A-57 151 087 (MATSUSHITA) 18-09-1982 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0947699A1 (de) * 1994-09-01 1999-10-06 Fluid Management, Inc. Zahnradpumpe
WO2007140679A1 (en) * 2006-05-30 2007-12-13 Lingyu Dong A gear pump
CN107762718A (zh) * 2016-08-16 2018-03-06 博罗承创精密工业有限公司 一种气动马达
CN107762718B (zh) * 2016-08-16 2020-03-17 博罗承创精密工业有限公司 一种气动马达

Also Published As

Publication number Publication date
FR2668208A1 (fr) 1992-04-24

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