EP0398020B1 - Pompe à engrenages à denture intérieure - Google Patents

Pompe à engrenages à denture intérieure Download PDF

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Publication number
EP0398020B1
EP0398020B1 EP90106863A EP90106863A EP0398020B1 EP 0398020 B1 EP0398020 B1 EP 0398020B1 EP 90106863 A EP90106863 A EP 90106863A EP 90106863 A EP90106863 A EP 90106863A EP 0398020 B1 EP0398020 B1 EP 0398020B1
Authority
EP
European Patent Office
Prior art keywords
internal gear
gear pump
sickle
bore
pump according
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
EP90106863A
Other languages
German (de)
English (en)
Other versions
EP0398020A2 (fr
EP0398020A3 (fr
Inventor
Max Bartl
Richard Strehler
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.)
Hurth Getriebe und Zahnraeder GmbH
Original Assignee
Hurth Getriebe und Zahnraeder GmbH
Carl Hurth Maschinen und Zahnradfabrik GmbH and Co
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 claimed from DE19893916155 external-priority patent/DE3916155A1/de
Priority claimed from DE9002160U external-priority patent/DE9002160U1/de
Application filed by Hurth Getriebe und Zahnraeder GmbH, Carl Hurth Maschinen und Zahnradfabrik GmbH and Co filed Critical Hurth Getriebe und Zahnraeder GmbH
Publication of EP0398020A2 publication Critical patent/EP0398020A2/fr
Publication of EP0398020A3 publication Critical patent/EP0398020A3/fr
Application granted granted Critical
Publication of EP0398020B1 publication Critical patent/EP0398020B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C2/10—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

  • the invention relates to an internal gear pump according to the preamble of claim 1.
  • the crescent-shaped filler tends to "flutter" within certain pressure and / or speed ranges and the associated noise, which is often referred to as unbearable.
  • the reason for this is to be found in the radial play between the filler piece and the two toothings, which enables the filler piece to swing back and forth depending on the pressures currently prevailing on the ring gear or pinion side.
  • From DE 25 33 646 C2 it is known to make the filler in two parts and to press the two parts against the tooth tips of the ring gear or the pinion. This solution cannot be used for very high-speed pumps (up to 6000 revolutions per minute) due to the wear that occurs.
  • the invention has for its object to develop an internal gear pump of the type mentioned so that the sickle-shaped filler is prevented from "fluttering" and the associated noise is prevented as much as possible.
  • the filler piece - with respect to the ring gear and the pinion - is non-positively fixed in the axial direction as soon as an oil pressure - even a small one - has built up in the pump.
  • the filler can be known in the radial direction and / or in the direction of rotation of the pump Means can be kept, for example with a spring element accommodated in the housing and penetrating the filler.
  • the oil pressure is also advantageously used for this.
  • the filler piece can adjust itself freely in any direction and is then determined partly by the oil pressure acting on the groove base and partly by the pressure piece that is supported under the oil pressure between the wall of the bore and the inclined surface in the housing. A "flutter" of the filler is almost impossible and rattling noises can not occur.
  • a filler (sickle) with a groove connected to the pressure side in one side of the plane is known from US Pat. No. 2,544,144.
  • This groove which has a comparatively small cross-section, opens into a groove with a larger cross-section running transversely thereto, which is connected to the tooth gaps of the ring gear and pinion, namely between the suction and the pressure side, that is to say in the unpressurized area.
  • the pressure of the oil flowing through the groove with the small cross section is thus constantly reduced and is not sufficient to fix the filler piece in the axial direction, as is the case according to the invention.
  • a ring gear 2 is rotatably supported with its peripheral surface (FIG. 1).
  • the two oil spaces S, D, the ring gear 2 and the pinion 3 are covered by a cover 10 screwed onto the housing (FIG. 2).
  • the sickle 8 On its flat side 11 facing the cover 10, the sickle 8 has a groove 12 extending from its tip, which is connected to the pressure-side oil chamber D and extends to the vicinity of its broad end. In this area, a groove 13 extends from the groove 12, which has a ball 16 in a cylindrical extension 14 in the area of the opposite face 15 corresponding diameter. The ball 16 protrudes beyond the flat side 15 and lies against a hollow conical ring surface 17 of a depression 18 offset relative to the bore 13 relative to the pin 4 or to the wide end of the sickle 8.
  • the sickle 8 When the pump goes into operation, the sickle 8 will also dodge because of its also only a very small radial distance to the tooth tips of the ring gear 2 and pinion 3 and the internal friction thus given in the direction of the arrow 6, that is to say in the direction of its pointed end.
  • a pressure builds up in the oil space D, it also acts via the groove 12 and the bore 13 on the ball 16, which is supported on the hollow conical annular surface 17 and on the wall of the extension 14.
  • the sickle 8 is pushed away in the direction of the arrow 6 in the opposite direction and is supported on the pin 4, which thus also serves as a support element.
  • the pressure prevailing in the groove 12 causes the sickle 8 to be pressed against the housing 1, as a result of which a "fluttering" of the sickle 8 and the associated noises are virtually impossible.
  • a slit-like recess 19 in the form of a cut with an inclined surface 20 is also possible (FIG. 3).
  • a retaining pin 22 is received in the bore 13 as a pressure piece.
  • the holding pin 22 protrudes beyond the flat side 15 and, with its expediently rounded or beveled circumferential edge 24, bears against a hollow-conical annular surface 25 of a depression 23 offset relative to the bore 13 relative to the pin 4 or to the wide end of the sickle 8.
  • the depression 18 is also here with the hollow conical ring surface 17 according to FIG. 2 or the slot-like recess 19 in the form of a milling with the inclined surface 20 according to FIG. 3.
  • the length of the holding pin 22 is dimensioned such that it also protrudes into the depression 23 or the like having the hollow conical ring surface 25 or the like. Inclined surface.
  • it can be offset in a suitable form, e.g. by a shoulder 26, or it is set off in a ring shape or crowned or the like. Then the oil pressure prevailing in the groove 13 can act on the offset surface and detach the retaining pin 22 from the cover 10.
  • the invention permits further variants which are also intended to fall under the property right.
  • a conical depression 21 can also be implemented, which is shown in FIG. 2 with broken lines.
  • housing 1 and cover 10 can be interchanged, which does not impair the effect of the measures according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Claims (7)

  1. Pompe à engrenages à denture intérieure avec un carter (1) fermé par un couvercle (10), avec une roue creuse (2) montée par sa surface périphérique de façon à pouvoir tourner dans le carter (1), avec un pignon à denture extérieure (3) en prise avec cette roue creuse, et avec une fourrure (8) en forme de croissant, qui est susceptible de pivoter entre le côté aspiration (S) et le côté refoulement (D) dans un espace entre la roue creuse (2) et le pignon (3) sur un axe de pivotement s'étendant parallèlement à l'axe du pignon, et qui par son extrémité (large) côté aspiration prend appui contre un élément d'appui (4) traversant l'espace entre la roue creuse (2) et le pignon (3), pompe caractérisée en ce que le croissant (8) comporte, seulement sur un côté plan, par exemple le côté plan (11) tourné vers le couvercle (10), une gorge (12) commençant à la pointe de ce croissant pour se terminer avant l'extrémité large de celui-ci, et qui, à la pointe du croissant (8), est en communication avec le côté refoulement (D).
  2. Pompe à engrenages à denture intérieure selon la revendication 1, caractérisée en ce qu'elle comporte un perçage (13) s'étendant dans le croissant (8) en partant de la gorge (12) vers le côté plan opposé, par exemple le côté plan (15) tourné vers le carter (1), ce perçage recevant une pièce de pression de diamètre approprié, de sorte que cette pièce de pression fasse saillie hors du croissant (8) et s'applique contre une surface oblique (20), orientée vers l'élément d'appui (4), d'un évidement se trouvant dans le carter (1).
  3. Pompe à engrenages à denture intérieure selon la revendication 2, caractérisée en ce que la pièce de pression est une bille (16) logée dans un évidement cylindrique (14) du percage (13) au voisinage du côté plan (15).
  4. Pompe à engrenages à denture intérieure selon la revendication 2, caractérisé en ce que la pièce de pression est une broche d'arrêt (22) logée dans le percage (13).
  5. Pompe à engrenages à denture intérieure selon la revendication 4, caractérisée en ce que la broche d'arrêt (22), sur son côté tourné vers le couvercle (10), est étagée ou chanfreinée ou bombée (26).
  6. Pompe à engrenages à denture intérieure selon la revendication 2, caractérisée en ce que la surface oblique (20) est formée par un évidement (19) en forme de fente.
  7. Pompe à engrenages à denture intérieure selon la revendication 2, caractérisé en ce que l'évidement est réalisé sour la forme d'un creux (18,23) décalé par rapport au perçage (13) vers l'élément d'appui (4), avec une surface annulaire en forme de cône creux (17, 25), qui constitue la surface oblique sur laquelle s'applique la pièce de pression (16, 22).
EP90106863A 1989-05-18 1990-04-10 Pompe à engrenages à denture intérieure Expired - Lifetime EP0398020B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19893916155 DE3916155A1 (de) 1989-05-18 1989-05-18 Innenzahnradpumpe
DE3916155 1989-05-18
DE9002160U 1990-02-23
DE9002160U DE9002160U1 (fr) 1990-02-23 1990-02-23

Publications (3)

Publication Number Publication Date
EP0398020A2 EP0398020A2 (fr) 1990-11-22
EP0398020A3 EP0398020A3 (fr) 1992-03-04
EP0398020B1 true EP0398020B1 (fr) 1993-09-22

Family

ID=25880989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106863A Expired - Lifetime EP0398020B1 (fr) 1989-05-18 1990-04-10 Pompe à engrenages à denture intérieure

Country Status (4)

Country Link
US (1) US5044905A (fr)
EP (1) EP0398020B1 (fr)
JP (1) JPH0311176A (fr)
DE (1) DE59002796D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1245466B (it) * 1991-03-19 1994-09-20 Iveco Fiat Elettropompa per la circolazione di un liquido, ad esempio in un motore a combustione interna
JP2604289B2 (ja) * 1991-06-30 1997-04-30 株式会社ユー・アール・ディー 定電流給電方式
DE102007049704B4 (de) * 2007-10-17 2019-01-31 Robert Bosch Gmbh Innenzahnradpumpe für eine Bremsanlage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544144A (en) * 1947-05-07 1951-03-06 Gen Motors Corp Oil burner pump
DE1653818A1 (de) * 1967-02-28 1971-06-09 Daimler Benz Ag Innenverzahnte Zahnradpumpe,insbesondere fuer die Druckmittelversorgung von selbsttaetig schaltenden Kraftfahrzeuggetrieben
DE2313085C2 (de) * 1973-03-16 1984-05-24 Otto 7502 Malsch Eckerle Axial und radial kompensierte Hochdruck-Zahnradpumpe
DE2533646C2 (de) * 1975-07-28 1986-04-17 Otto Sion Wallis Eckerle Hochdruck-Zahnradpumpe oder -motor
DE2641278A1 (de) * 1976-09-14 1978-03-16 Voith Getriebe Kg Innenzahnradpumpe
DE2650908A1 (de) * 1976-11-06 1978-05-11 Bosch Gmbh Robert Innenzahnradmaschine (pumpe oder motor)

Also Published As

Publication number Publication date
DE59002796D1 (de) 1993-10-28
EP0398020A2 (fr) 1990-11-22
EP0398020A3 (fr) 1992-03-04
US5044905A (en) 1991-09-03
JPH0311176A (ja) 1991-01-18

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