EP0866225A1 - Internal gear pump without crescent filling piece with sealing elements inserted in the tooth heads - Google Patents

Internal gear pump without crescent filling piece with sealing elements inserted in the tooth heads Download PDF

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Publication number
EP0866225A1
EP0866225A1 EP98101501A EP98101501A EP0866225A1 EP 0866225 A1 EP0866225 A1 EP 0866225A1 EP 98101501 A EP98101501 A EP 98101501A EP 98101501 A EP98101501 A EP 98101501A EP 0866225 A1 EP0866225 A1 EP 0866225A1
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EP
European Patent Office
Prior art keywords
ring gear
pinion
sealing element
groove
toothing
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.)
Granted
Application number
EP98101501A
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German (de)
French (fr)
Other versions
EP0866225B1 (en
Inventor
Franz Arbogast
Peter Peiz
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.)
Voith Turbo GmbH and Co KG
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Voith Turbo GmbH and Co KG
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 Voith Turbo GmbH and Co KG filed Critical Voith Turbo GmbH and Co KG
Publication of EP0866225A1 publication Critical patent/EP0866225A1/en
Application granted granted Critical
Publication of EP0866225B1 publication Critical patent/EP0866225B1/en
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
    • F04C2/102—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 the two members rotating simultaneously around their respective axes

Definitions

  • the present invention relates to a sickle-free internal gear pump for Generation of high pressure according to the preamble of the claim.
  • a pump of this generic type is from DE 41 40 293 C2 known.
  • Internal gear pumps generally have an internal gear with which an externally toothed pinion meshes with a smaller number of teeth, i.e. is drivingly engaged.
  • the teeth of such pumps - based on the diameter of the pinion or the ring gear - relatively narrow, so that after the volume flow to be pumped through the height of the teeth and the width of the toothing is determined, this volume flow at the common pumps is limited for design reasons.
  • Sickle Internal gear pumps have the particular advantage of minimal Construction volume.
  • the profile groove also the The task is to limit the radial movement of the sealing element.
  • the profilnut has the function of a radial end stop.
  • the present invention is based on the problem, a sickle-free internal gear pump of the generic type to specify at the aforementioned problem does not exist.
  • the essence of the present invention lies in the sealing element and / or to design the profile groove so that along the contact surfaces between Sealing element and profile groove (at least) effecting pressure equalization (Control) groove is incorporated.
  • FIG. 1 shows a sickle-free, head-sealing and cross-section backlash, each with a flank sealing internal gear pump, and in the area of a housing part 1, which - viewed in the axial direction - Connect further housing parts.
  • a fixed on a drive shaft 4 externally toothed pinion 5 meshes with an internally toothed ring gear 6 and thus forms a toothing 12.
  • the pinion 5 and the ring gear 6 are not coaxially but eccentrically; also has the pinion 5 one tooth less than the pinion 6, so that the outside of each Toothed head 14 comes into contact with the ring gear 6.
  • a Suction port 7 in the zone where the rotation in the direction of arrow X Teeth on pinion 5 or ring gear 6 are out of engagement.
  • a pressure port 10 is also located starting from a ring gear 6 extending over a circumferential region extending pressure pocket 11, on the opposite side of the pump. The inflow from the pressure medium to the interior of the pump, i.e. to the Tooth gaps in the pinion 5 and in the ring gear 6, which promote the Cause pressure medium takes place via radial openings 17 in the ring gear 6. These openings 17 start from the outer surface 20 of the ring gear 6 and flow into its tooth base.
  • FIGS. 2 to 5 show "Z" according to FIG. 1, corresponding to detail a sealing element 30 inserted into a profile groove 34 of the pinion is shown, once - analogously to FIG. 1 - in supervision and once in a side view, arrows II, III, IV and V clarify how the side view is see is.
  • Fig. 2 shows a first embodiment, according to - in the direction of rotation X of the pinion 5 viewed - in the trailing side surface of the sealing element 30 a groove 52 is incorporated. As can be seen from the side view, is this groove 52 at both ends towards the head of the sealing element 30 pulled up.
  • Fig. 3 shows a second embodiment according to - in the direction of rotation X considered - a groove 53 on the trailing side surface of the profile groove 34 is incorporated. From the side view it can be seen that the Groove 53 at both ends to the head of the radial groove 34 or the tooth head on Pinion is pulled up.
  • Fig. 4 shows a third embodiment according to - in the direction of rotation X considered - a groove 54 on the leading side surface of the sealing element 30 is incorporated.
  • Fig. 5 shows a fourth embodiment, according to the lagging Side surface of the radial groove 34, a groove 55 is incorporated.

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

Abstract

Die Erfindung betrifft eine sichellose Zahnradpumpe; mit einer Verzahnung, die im wesentlichen mit einer Flanke dichtet; die Verzahnung weist ein innenverzahntes Hohlrad und ein mit dem Hohlrad kämmendes Ritzel auf; Hohlrad und Ritzel sind in einem gemeinsamen Gehäuseteil drehbar gelagert; das Gehäuseteil weist einen Sauganschluß und einen Druckanschluß auf; das Hohlrad weist radiale Durchbrüche für das zu pumpende Medium auf; die Zahnköpfe des Hohlrades sind jeweils mit schwalbenschwanzförmigen Profilnuten versehen, in die ein radial bewegliches Dichtelement eingesetzt ist, das am gegenüberliegenden Zahnkopf des Ritzels gleiten kann. Die Erfindung ist gekennzeichnet durch die folgenden Merkmale: längs der Profilnut und/oder des Dichtelementes ist jeweils eine Nut eingearbeitet. <IMAGE>The invention relates to a sickle-free gear pump; with a toothing that essentially seals with a flank; the toothing has an internally toothed ring gear and a pinion meshing with the ring gear; Ring gear and pinion are rotatably mounted in a common housing part; the housing part has a suction connection and a pressure connection; the ring gear has radial openings for the medium to be pumped; the toothed heads of the ring gear are each provided with dovetail-shaped profile grooves into which a radially movable sealing element is inserted, which can slide on the opposite toothed head of the pinion. The invention is characterized by the following features: a groove is incorporated in each case along the profile groove and / or the sealing element. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine sichellose Innenzahnradpumpe zur Erzeugung von Hochdruck nach dem Oberbegriff des Patentanspruchs.The present invention relates to a sickle-free internal gear pump for Generation of high pressure according to the preamble of the claim.

Eine Pumpe dieser gattungsgemäßen Bauart ist aus der DE 41 40 293 C2 bekannt.A pump of this generic type is from DE 41 40 293 C2 known.

Innenzahnradpumpen weisen im allgemeinen ein innenverzahntes Hohlrad auf, mit dem ein außenverzahntes Ritzel mit geringerer Zähnezahl kämmt, d.h. treibend im Eingriff steht. In der Regel ist die Verzahnung derartiger Pumpen - bezogen auf den Durchmesser der Ritzel bzw. des Hohlrads - relativ schmal, so daß, nachdem der zu fördernde Volumenstrom durch die Höhe der Zähne und die Breite der Verzahnung bestimmt ist, dieser Volumenstrom bei den gängigen Pumpen aus konstruktiven Gründen begrenzt ist. Sichellose Innenzahnradpumpen haben insbesondere den Vorteil eines minimalen Bauvolumens.Internal gear pumps generally have an internal gear with which an externally toothed pinion meshes with a smaller number of teeth, i.e. is drivingly engaged. As a rule, the teeth of such pumps - based on the diameter of the pinion or the ring gear - relatively narrow, so that after the volume flow to be pumped through the height of the teeth and the width of the toothing is determined, this volume flow at the common pumps is limited for design reasons. Sickle Internal gear pumps have the particular advantage of minimal Construction volume.

Zur Verbesserung der Dichtheit zwischen den Zahnköpfen von Ritzel und Hohlrad ist in der DE 41 40 293 C2 bereits vorgeschlagen worden, in jedem der Zahnköpfe des Hohlrads, und zwar in einer schwalbenschwanzförmigen Profilnut, ein Dichtelement einzusetzen, wobei die Profilnut insoweit auch die Aufgabe hat, die radiale Bewegung des Dichtelements zu begrenzen. Die Profilnut hat also quasi die Aufgabe eines radialen Endanschlags. To improve the tightness between the tooth tips of the pinion and Ring gear has already been proposed in DE 41 40 293 C2, in each the tooth tips of the ring gear, in a dovetail shape Profile groove to use a sealing element, the profile groove also the The task is to limit the radial movement of the sealing element. The Profilnut has the function of a radial end stop.

In dem Fall, daß das Dichtelement seine (radial äußere) Endposition erreicht hat, liegen die beiden Seitenflächen des Dichtelements paßgenau an den Seitenflächen der Profilnut an. Die Folge davon ist, daß über die Breite der Verzahnung betrachtet eine bestimmte definierte Druckverteilung nicht mehr gewährleistet ist. Dies wiederum kann zu undefinierten bzw. veränderlichen Betriebszuständen der Pumpe führen.In the event that the sealing element reaches its (radially outer) end position has, the two side surfaces of the sealing element fit snugly on the Side surfaces of the profile groove. The consequence of this is that across the width of the Gearing no longer considers a certain defined pressure distribution is guaranteed. This, in turn, can become undefined or changeable Operating conditions of the pump.

Der vorliegenden Erfindung liegt die Problemstellung zugrunde, eine sichellose Innenzahnradpumpe der gattungsgemäßen Art anzugeben, bei der die vorgenannte Problematik nicht vorhanden ist.The present invention is based on the problem, a sickle-free internal gear pump of the generic type to specify at the aforementioned problem does not exist.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs gelöst.This object is solved by the features of the patent claim.

Der Kern der vorliegenden Erfindung liegt darin, das Dichtelement und/oder die Profilnut so zu gestalten, daß längs der Anlageflächen zwischen Dichtelement und Profilnut (mindestens) eine den Druckausgleich bewirkende (Steuer-) Nut eingearbeitet ist.The essence of the present invention lies in the sealing element and / or to design the profile groove so that along the contact surfaces between Sealing element and profile groove (at least) effecting pressure equalization (Control) groove is incorporated.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert. Diese zeigt in

Fig. 1
einen Querschnitt durch eine sichellose Innenzahnradpumpe im Bereich der beiden Zahnräder;
Fig. 2
je einen Ausschnitt gemäß dem Detail "Z" aus Fig. 1;
Fig. 3
mit je einem Ausführungsbeispiel der Realisierung;
Fig. 4
der Steuernut im Anlagebereich zwischen dem Dichtelement und der Profilnut , und zwar in zwei Ansichten;
Fig. 5
zeig ein weiteres Ausführungsbeispiel.
The invention is explained below with reference to the drawing. This shows in
Fig. 1
a cross section through a sickle-free internal gear pump in the region of the two gears;
Fig. 2
a section according to the detail "Z" from FIG. 1;
Fig. 3
each with an embodiment of the realization;
Fig. 4
the control groove in the contact area between the sealing element and the profile groove, in two views;
Fig. 5
show another embodiment.

Die Figur 1 zeigt in einem Querschnitt eine sichellose, kopfdichtende und spielbehaftete, jeweils mit einer Flanke dichtenden Innenzahnradpumpe, und zwar im Bereich eines Gehäuseteils 1, dem sich - in Axialrichtung betrachtet - weitere Gehäuseteile anschließen. Ein auf einer Antriebswelle 4 befestigtes außenverzahntes Ritzel 5 steht im Eingriff mit einem innenverzahnten Hohlrad 6 und bildet so eine Verzahnung 12. Das Ritzel 5 und das Hohlrad 6 sind nicht koaxial, sondern exzentrisch zueinander gelagert; ferner weist das Ritzel 5 einen Zahn weniger auf als das Ritzel 6, so daß jeweils die Außenseite eines Zahnkopfes 14 am Hohlrad 6 in Berührung kommt. Zu erkennen ist ferner ein Sauganschluß 7 in der Zone, bei der unter Drehung in Pfeilrichtung X die Zähne am Ritzel 5 bzw. Hohlrad 6 außer Eingriff geraten. Dem Sauganschluß 7 im Gehäuseteil 1, in dem das Hohlrad 6 und das Ritzel 6 gelagert sind, schließt sich in axialer Richtung jeweils zu den benachbarten Gehäuseteilen eine Saugtasche 8 an, die sich über einen Teil der Mantelfläche 20 des Hohlrads 6 erstreckt. Ein Druckanschluß 10 befindet sich, ebenfalls ausgehend von einer sich über einen Umfangsbereich am Hohlrad 6 erstreckenden Drucktasche 11, auf der gegenüberliegenden Seite der Pumpe. Die Zuströmung vom Druckmedium zum Innenraum der Pumpe, also zu den Zahnnlücken im Ritzel 5 und im Hohlrad 6, welche die Förderung des Druckmediums bewirken, erfolgt über radiale Durchbrüche 17 im Hohlrad 6. Diese Durchbrüche 17 gehen von der Mantelfläche 20 des Hohlrads 6 aus und münden in dessen Zahngrund.FIG. 1 shows a sickle-free, head-sealing and cross-section backlash, each with a flank sealing internal gear pump, and in the area of a housing part 1, which - viewed in the axial direction - Connect further housing parts. A fixed on a drive shaft 4 externally toothed pinion 5 meshes with an internally toothed ring gear 6 and thus forms a toothing 12. The pinion 5 and the ring gear 6 are not coaxially but eccentrically; also has the pinion 5 one tooth less than the pinion 6, so that the outside of each Toothed head 14 comes into contact with the ring gear 6. One can also see a Suction port 7 in the zone where the rotation in the direction of arrow X Teeth on pinion 5 or ring gear 6 are out of engagement. The suction port 7 in the housing part 1, in which the ring gear 6 and the pinion 6 are mounted, closes in the axial direction to the adjacent housing parts a suction bag 8, which extends over part of the lateral surface 20 of the Ring gear 6 extends. A pressure port 10 is also located starting from a ring gear 6 extending over a circumferential region extending pressure pocket 11, on the opposite side of the pump. The inflow from the pressure medium to the interior of the pump, i.e. to the Tooth gaps in the pinion 5 and in the ring gear 6, which promote the Cause pressure medium takes place via radial openings 17 in the ring gear 6. These openings 17 start from the outer surface 20 of the ring gear 6 and flow into its tooth base.

Gemäß der Darstellung nach Fig. 1 sind an den Zahnköpfen des Hohlrads 6 jeweils Dichtelemente 30 eingesetzt, die - in Drehrichtung des Ritzels 5 betrachtet - die Verzahnung 12 zwischen Ritzel 5 und Hohlrad 6 abdichten.1 are on the tooth tips of the ring gear 6th sealing elements 30 are used in each case, which - in the direction of rotation of the pinion 5 considered - seal the teeth 12 between pinion 5 and ring gear 6.

Gemäß den in den Figuren 2, 3, 4 und 5 dargestellten Ausführungsbeispielen ist aufgezeigt, wie die Dichtelemente 30 in den schwalbenschwanzähnlichen Profilnuten 34 formschlüssig eingepaßt sind und wie die Seiten-/Berührungsflächen zwischen Dichtelement 30 und Profilnut 34 ausgebildet sein können, um über die Breite der Verzahnung 12 eine gleichmäßige Druckverteilung und damit ein stabiles Betriebsverhalten der Pumpe zu gewährleisten. In den Figuren 2 bis 5 ist - entsprechend Detail "Z" nach Fig. 1 - ein in eine Profilnut 34 des Ritzels eingesetztes Dichtelement 30 dargestellt, und zwar einmal - analog zu Fig. 1 - in Aufsicht und einmal in Seitensicht, wobei über Pfeile II, III, IV und V jeweils klargestellt ist, wie die Seitensicht zu sehen ist.According to the embodiments shown in Figures 2, 3, 4 and 5 is shown how the sealing elements 30 in the dovetail-like Profile grooves 34 are positively fitted and like the side / contact surfaces formed between sealing element 30 and profile groove 34 can be uniform over the width of the toothing 12 Pressure distribution and thus a stable operating behavior of the pump guarantee. FIGS. 2 to 5 show "Z" according to FIG. 1, corresponding to detail a sealing element 30 inserted into a profile groove 34 of the pinion is shown, once - analogously to FIG. 1 - in supervision and once in a side view, arrows II, III, IV and V clarify how the side view is see is.

Fig. 2 zeigt ein erstes Ausführungsbeispiel, gemäß dem - in Drehrichtung X des Ritzels 5 betrachtet - in der nacheilenden Seitenfläche des Dichtelements 30 eine Nut 52 eingearbeitet ist. Wie aus der Seitensicht zu erkennen ist, ist diese Nut 52 an ihren beiden Enden zum Kopf des Dichtelements 30 hin hochgezogen.Fig. 2 shows a first embodiment, according to - in the direction of rotation X of the pinion 5 viewed - in the trailing side surface of the sealing element 30 a groove 52 is incorporated. As can be seen from the side view, is this groove 52 at both ends towards the head of the sealing element 30 pulled up.

Fig. 3 zeigt ein zweites Ausführungsbeispiel gemäß dem - in Drehrichtung X betrachtet - an der nacheilenden Seitenfläche der Profilnut 34 eine Nut 53 eingearbeitet ist. Aus der Seitenansicht ist zu erkennen, daß auch hierbei die Nut 53 an beiden Enden zum Kopf der Radialnut 34 bzw. des Zahnkopfes am Ritzel hochgezogen ist.Fig. 3 shows a second embodiment according to - in the direction of rotation X considered - a groove 53 on the trailing side surface of the profile groove 34 is incorporated. From the side view it can be seen that the Groove 53 at both ends to the head of the radial groove 34 or the tooth head on Pinion is pulled up.

Fig. 4 zeigt ein drittes Ausführungsbeispiel gemäß dem - in Drehrichtung X betrachtet - an der voreilenden Seitenfläche des Dichtelements 30 eine Nut 54 eingearbeitet ist.Fig. 4 shows a third embodiment according to - in the direction of rotation X considered - a groove 54 on the leading side surface of the sealing element 30 is incorporated.

Fig. 5 zeigt ein viertes Ausführungsbeispiel, gemäß dem an der nacheilenden Seitenfläche der Radialnut 34 eine Nut 55 eingearbeitet ist.Fig. 5 shows a fourth embodiment, according to the lagging Side surface of the radial groove 34, a groove 55 is incorporated.

Zusammenfassend läßt sich bezüglich der in den Figuren 2, 3, 4 und 5 dargestellten Ausführungsbeispiele feststellen und festhalten, daß auf der Grundlage der Nuten 52, 53, 54 bzw. 55 in den Seitenflächen des Dichtelements 30 bzw. der Radialnut 34 quer zur Verzahnung eine definierte Druckverteilung gewährleistet ist. Gegebenenfalls lassen sich die Nuten gemäß dem dargestellten Ausführungsbeispiel auch in Kombination realisieren.In summary, with regard to that in FIGS. 2, 3, 4 and 5 determine illustrated embodiments and note that on the Basis of the grooves 52, 53, 54 and 55 in the side surfaces of the Sealing element 30 or the radial groove 34 a defined transverse to the toothing Pressure distribution is guaranteed. If necessary, the grooves according to the illustrated embodiment, also in combination realize.

Claims (1)

Sichellose Zahnradpumpe; 1.1 mit einer Verzahnung (12), die im wesentlichen mit einer Flanke dichtet; 1.2 die Verzahnung (12) weist ein innenverzahntes Hohlrad (6) und ein mit dem Hohlrad (6) kämmendes Ritzel (5) auf; 1.3 Hohlrad (6) und Ritzel (5) sind in einem gemeinsamen Gehäuseteil (1) drehbar gelagert; 1.4 das Gehäuseteil (1) weist einen Sauganschluß (7) und einen Druckanschluß (10) auf; 1.5 das Hohlrad (6) weist radiale Durchbrüche (17) für das zu pumpende Medium auf; 1.6 die Zahnköpfe (14) des Hohlrades (6) sind jeweils mit schwalbenschwanzförmigen Profilnuten (34) versehen, in die ein radial bewegliches Dichtelement (30) eingesetzt ist, das am gegenüberliegenden Zahnkopf des Ritzels (5) gleiten kann; gekennzeichnet durch das folgende Merkmal: 1.7 längs der Anlageflächen zwischen der Profilnut (34) und/oder dem Dichtelement (30) ist mindestens eine Nut (52, 53, 54, 55) eingearbeitet. Sickle-free gear pump; 1.1 with a toothing (12) which essentially seals with a flank; 1.2 the toothing (12) has an internally toothed ring gear (6) and a pinion (5) meshing with the ring gear (6); 1.3 ring gear (6) and pinion (5) are rotatably mounted in a common housing part (1); 1.4 the housing part (1) has a suction connection (7) and a pressure connection (10); 1.5 the ring gear (6) has radial openings (17) for the medium to be pumped; 1.6 the tooth heads (14) of the ring gear (6) are each provided with dovetail-shaped profile grooves (34) into which a radially movable sealing element (30) is inserted, which can slide on the opposite tooth head of the pinion (5); characterized by the following characteristic: 1.7 at least one groove (52, 53, 54, 55) is incorporated along the contact surfaces between the profile groove (34) and / or the sealing element (30).
EP98101501A 1997-03-22 1998-01-29 Internal gear pump without crescent filling piece with sealing elements inserted in the tooth heads Expired - Lifetime EP0866225B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712169A DE19712169C1 (en) 1997-03-22 1997-03-22 Internal-gear pump without crescent components
DE19712169 1997-03-22

Publications (2)

Publication Number Publication Date
EP0866225A1 true EP0866225A1 (en) 1998-09-23
EP0866225B1 EP0866225B1 (en) 2001-07-04

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EP98101501A Expired - Lifetime EP0866225B1 (en) 1997-03-22 1998-01-29 Internal gear pump without crescent filling piece with sealing elements inserted in the tooth heads

Country Status (7)

Country Link
US (1) US6093006A (en)
EP (1) EP0866225B1 (en)
JP (1) JPH10266974A (en)
DE (2) DE19712169C1 (en)
DK (1) DK0866225T3 (en)
ES (1) ES2159160T3 (en)
TW (1) TW411984U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103573617A (en) * 2012-07-24 2014-02-12 株式会社爱德克斯 Gear pump device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804134A1 (en) * 1998-02-03 1999-08-12 Voith Turbo Kg Sickle-free internal gear pump
CN101984257B (en) * 2010-10-30 2012-03-28 辽宁工程技术大学 Balanced type crescent seal gear pump
US10207535B2 (en) * 2013-11-08 2019-02-19 Sanford, L.P. Self-cleaning gear assembly for pencil sharpeners

Citations (3)

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Publication number Priority date Publication date Assignee Title
US3171587A (en) * 1961-01-21 1965-03-02 Nsu Motorenwerke Ag Sealing structures
US3238929A (en) * 1962-07-24 1966-03-08 Daimler Benz Ag Engine seal
DE4140293A1 (en) 1991-12-06 1993-06-09 J.M. Voith Gmbh, 7920 Heidenheim, De SAFETY INTERNAL GEAR PUMP WITH SEALING ELEMENTS INSERTED IN THE GEAR HEADS

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US60366A (en) * 1866-12-11 moekis
DE3633330A1 (en) * 1986-10-01 1988-04-07 Pierburg Gmbh Sealing strips for rotary piston machine - are spring-loaded at low speed but have running clearance at high speed

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171587A (en) * 1961-01-21 1965-03-02 Nsu Motorenwerke Ag Sealing structures
US3238929A (en) * 1962-07-24 1966-03-08 Daimler Benz Ag Engine seal
DE4140293A1 (en) 1991-12-06 1993-06-09 J.M. Voith Gmbh, 7920 Heidenheim, De SAFETY INTERNAL GEAR PUMP WITH SEALING ELEMENTS INSERTED IN THE GEAR HEADS
EP0545424A1 (en) * 1991-12-06 1993-06-09 J.M. Voith GmbH Internal gear pump with sealings incorporated in the teeth

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103573617A (en) * 2012-07-24 2014-02-12 株式会社爱德克斯 Gear pump device
CN103573617B (en) * 2012-07-24 2016-12-07 株式会社爱德克斯 Gear pump arrangement

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Publication number Publication date
US6093006A (en) 2000-07-25
JPH10266974A (en) 1998-10-06
TW411984U (en) 2000-11-11
EP0866225B1 (en) 2001-07-04
DE59800951D1 (en) 2001-08-09
DK0866225T3 (en) 2001-10-15
DE19712169C1 (en) 1998-03-12
ES2159160T3 (en) 2001-09-16

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