EP0831231B1 - Gear pump - Google Patents
Gear pump Download PDFInfo
- Publication number
- EP0831231B1 EP0831231B1 EP97114967A EP97114967A EP0831231B1 EP 0831231 B1 EP0831231 B1 EP 0831231B1 EP 97114967 A EP97114967 A EP 97114967A EP 97114967 A EP97114967 A EP 97114967A EP 0831231 B1 EP0831231 B1 EP 0831231B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- space
- opening
- feed pump
- housing lid
- 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
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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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
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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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/04—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for reversible machines or pumps
Definitions
- the invention relates to a feed pump according to the genus of Claim 1.
- Such a feed pump is known from DE 75 07 541 U.
- This Feed pump has a rotatingly driven in a pump chamber Pair of intermeshing gears on which a pumped medium an intake space connected to a storage tank along one between the end face of the gears and the peripheral wall of the Promote pumping chamber formed delivery channel in a pressure chamber. It is a bypass duct connecting the suction chamber with the pressure chamber provided by means of a pressure valve arranged therein is taxable.
- the bypass channel receiving the pressure valve is in a housing cover closing the housing of the feed pump arranged.
- the bypass channel is considered perpendicular to the axis of the Gear longitudinal bore formed, each over a Transverse opening with the suction chamber and the pressure chamber of the pump chamber connected is.
- the longitudinal bore of the bypass channel is so in Housing cover arranged that in a first mounting position of the Housing cover on the pump housing a first transverse opening in the Intake chamber and the second transverse opening opens into the pressure chamber.
- the Known feed pump has the disadvantage that with a Design of the housing cover only clockwise or counterclockwise Feed pumps can be equipped so that for different Different housing covers are necessary, which increases the manufacturing effort and flexible use of the feed pump.
- the feed pump according to the invention with the features according to claim 1 has the advantage that with an execution of the Housing cover both a right-handed and a left-handed Feed pump can be equipped, so that the manufacturing costs is reduced.
- the respective cross openings either in the left Pump chamber or the pump chamber on the right. To this Way can be while maintaining the direction of action in the Bypass channel used pressure valve by simply turning the Housing cover a clockwise or anti-clockwise rotation of the feed pump enable.
- the inlet and outlet openings or suction and pressure openings of the pumping chamber are advantageously arranged on the line of contact of the gearwheels and thus also lead securely into the respective pumping chamber space in both mounting positions. It is advantageous to provide the inlet line or the suction opening with a cross-sectional constriction, which forms a suction throttle to be adjusted accordingly.
- a second bypass channel can also be provided in the pump cover, which is then arranged on the opposite side beyond the line of contact of the gearwheels in the pump cover.
- the feed pump according to the invention is particularly suitable for delivering fuel from a storage tank to a fuel injection pump of an internal combustion engine, but can also be used for delivering other liquid delivery media.
- FIG. 1 shows a view of the cover side of the feed pump with the bypass channel cut out and the Representation of the position of the gears
- Figure 2 is a sectional view of the feed pump in a view rotated by 90 ° to Figure 1.
- the feed pump according to the invention shown in two views in FIGS. 1 and 2 is inserted into a feed line (not shown) from a storage tank to a fuel injection pump for internal combustion engines.
- the exemplary embodiment of the feed pump shown in FIGS. 1 and 2 has a pump chamber 3 in its housing 1, in which a rotatingly driven pair of meshing gears is arranged.
- a first gearwheel 5, which is located in the exemplary embodiment, is rotatably driven by means of an external drive element 7 (not shown in more detail) and transmits this rotary movement via a spur toothing to a second gearwheel 9 meshing with the first gearwheel 5.
- the gearwheels 5, 9 thereby divide the pump chamber 3 their tooth engagement in two sections, of which a first section forms an intake chamber 11 and a second section forms a pressure chamber 13.
- the suction chamber 11 is connected to the pressure chamber 13 via a delivery channel 15 formed between the tooth grooves on the end faces of the first and second gear wheels 5, 9 and the upper and lower peripheral wall of the pump chamber 3.
- the suction chamber 11 and the pressure chamber 13 each have a connection opening in the wall of the pump housing 1, via which the suction chamber 11 is connected to a suction line, not shown, from the storage tank and the pressure chamber 13 to a delivery line, also not shown, to the suction chamber of the fuel injection pump.
- connection opening in the suction space 11 forms a suction or inlet opening 17 and the connection opening in the pressure space 13 forms a pressure or Outlet opening 19, which are arranged in a housing cover 21 which closes the pumping chamber 3, the inlet opening having a cross-sectional reduction, not shown in more detail, which forms a suction throttle.
- the gear wheels 5, 9 are mounted on housing pins which project into the interior of the pump housing 1 and which are formed in one piece with the pump housing 1. In this case, a first housing pin 23 located at the bottom forms a bearing pin receiving the first gear wheel 5 and a second housing pin 25 located at the top forms a bearing pin receiving the second gear wheel 9.
- the first housing pin 23 has an axial through bore 27, in which a drive shaft 29 is guided, which is connected in a rotationally locking manner to the drive element 7 at its end facing away from the housing cover 21. At its end remote from the drive element 7, the drive shaft 29 protrudes from the bore 27 of the first housing pin 23 into a coupling member 31 to the first gear 5, via which the rotary movement of the drive shaft 29 is transmitted to the gear 5.
- a bypass duct 41 is also provided for pressure control of the delivery pressure in the pressure chamber 13 and thus for the delivery rate control.
- This bypass channel 41 which connects the pressure chamber 13 to the suction chamber 11, is arranged in the housing cover 21 and is formed by a longitudinal bore 43 in the housing cover 21 which runs perpendicular to the axis of the gear wheels 5, 9.
- the longitudinal bore 43 is as Blind hole executed, the open end of which is closed by means of a sealing plug 45 or alternatively by means of a ball.
- the longitudinal bore 43 is arranged close below a line of contact of the meshing gears 5, 9, at which the pump chamber 3 is separated into the suction chamber 11 and the pressure chamber 13, but does not intersect this line of contact.
- a transverse opening leads into the pump chamber 3, a first transverse opening 47 opening into the suction chamber 11 on the left in the exemplary embodiment and a second transverse opening 49 opening into the pressure chamber 13 on the right.
- the longitudinal bore 43 of the bypass duct 41 has a cross-sectional reduction in the direction of the pressure chamber 13 formed by a shoulder, which forms a valve seat 51 of a pressure valve 53 inserted into the bypass duct 41 and opening in the direction of the suction chamber 11.
- a disc-shaped valve closing member 55 of the pressure valve 53 comes into sealing contact with this valve seat 51 and is acted upon by a valve spring 57 on its side facing away from the valve seat.
- This valve spring 57 which acts as a compression spring and acts on the valve closing member 55, is supported on the annular end face of a slotted clamping sleeve 59 pressed into the end of the longitudinal bore 43 on the suction chamber side, via whose axial immersion depth the pretensioning force of the valve spring 57 can be adjusted.
- the first transverse opening 47 is arranged in the area of the overlap with the clamping sleeve 59 and the second transverse opening 49 is arranged in the bore area of the longitudinal bore 43 adjoining the valve seat 51 on the pressure chamber side.
- FIG. 1 shows a so-called right-hand delivery pump, in which the drive shaft 29 rotates clockwise (on the opposite side of the cover in the opposite direction), the suction chamber 11 being arranged on the left and the pressure chamber 13 on the right in the cover view.
- the right-hand space (formerly pressure chamber) of pumping chamber 3 now acts as a suction space
- the left-hand space (formerly suction space) acts as a pressure space.
- the housing cover 21 is now removed and rotated again by 180 ° about the pump axis, so that the longitudinal bore 43 of the bypass channel 41 is now arranged above the line of contact of the gear wheels 5,9.
- the now transversed first transverse opening 47 opens into the suction chamber 11 and the second transverse opening 49 again into the pressure chamber 13.
- the feed pump according to the invention works in the following way.
- the drive shaft 29 is preferably driven to rotate in proportion to the speed of an internal combustion engine to be supplied.
- the drive shaft 29 transmits the rotary movement via the coupling member 31 to the first gear 5, which in turn drives the second gear 9 meshing with it.
- the delivery medium preferably fuel
- the intake chamber 11 is conveyed from the intake chamber 11 along the delivery channels 15 into the pressure chamber 13. This creates a negative pressure in the intake chamber 11, which is sufficient to draw in further fuel from the storage tank via the intake line.
- the fuel pressure built up in the pressure chamber 13 causes fuel to be delivered via the outlet opening 19 into the delivery line to the fuel injection pump.
- the control of the maximum delivery pressure and the maximum delivery rate at the outlet opening 17 to the delivery line via the bypass channel 41 takes place in that the valve closing member 55 of the pressure valve 53 used therein lifts off from the valve seat 51 above a certain pressure in the pressure chamber 13 and thus opens an outflow cross section at the bypass channel 41 , via which a part of the pressurized flow rate flows out of the pressure chamber 13 into the suction chamber 11, the opening pressure of the pressure valve 53 being able to be set via the biasing force of the valve spring 57.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
Description
Die Erfindung betrifft eine Förderpumpe nach der Gattung des
Anspruchs 1.The invention relates to a feed pump according to the genus of
Eine solche Förderpumpe ist durch die DE 75 07 541 U bekannt. Diese Förderpumpe weist ein in einer Pumpkammer rotierend angetriebenes Paar miteinander kämmender Zahnräder auf, die ein Fördermedium aus einem mit einem Vorratstank verbundenen Ansaugraum entlang einem zwischen der Stirnfläche der Zahnräder und der Umfangswand der Pumpkammer gebildeten Förderkanal in einen Druckraum fördern. Es ist ein den Ansaugraum mit dem Druckraum verbindender Bypasskanal vorgesehen, der mittels eines darin angeordneten Druckventils aufsteuerbar ist. Der das Druckventil aufnehmende Bypasskanal ist in einem das Gehäuse der Förderpumpe verschließenden Gehäusedeckel angeordnet. Der Bypasskanal ist als senkrecht zur Achse der Zahnräder verlaufende Längsbohrung ausgebildet, die über je eine Queröffnung mit dem Ansaugraum und dem Druckraum der Pumpkammer verbunden ist. Die Längsbohrung des Bypasskanals ist so im Gehäusedeckel angeordnet, daß in einer ersten Montagelage des Gehäusedeckels am Pumpengehäuse eine erste Queröffnung in den Ansaugraum und die zweite Queröffnung in den Druckraum mündet. Die bekannte Förderpumpe weist dabei den Nachteil auf, daß mit einer Ausführung des Gehäusedeckels nur rechts- oder linkslaufende Förderpumpen bestückt werden können, so daß für verschiedene Antriebsdrehrichtungen verschiedene Gehäusedeckel notwendig sind, was den Fertigungsaufwand erhöht und eine flexible Einsetzbarkeit der Förderpumpe einschränkt.Such a feed pump is known from DE 75 07 541 U. This Feed pump has a rotatingly driven in a pump chamber Pair of intermeshing gears on which a pumped medium an intake space connected to a storage tank along one between the end face of the gears and the peripheral wall of the Promote pumping chamber formed delivery channel in a pressure chamber. It is a bypass duct connecting the suction chamber with the pressure chamber provided by means of a pressure valve arranged therein is taxable. The bypass channel receiving the pressure valve is in a housing cover closing the housing of the feed pump arranged. The bypass channel is considered perpendicular to the axis of the Gear longitudinal bore formed, each over a Transverse opening with the suction chamber and the pressure chamber of the pump chamber connected is. The longitudinal bore of the bypass channel is so in Housing cover arranged that in a first mounting position of the Housing cover on the pump housing a first transverse opening in the Intake chamber and the second transverse opening opens into the pressure chamber. The Known feed pump has the disadvantage that with a Design of the housing cover only clockwise or counterclockwise Feed pumps can be equipped so that for different Different housing covers are necessary, which increases the manufacturing effort and flexible use of the feed pump.
Die erfindungsgemäße Förderpumpe mit den Merkmalen gemäß Anspruch 1
hat demgegenüber den Vorteil, daß mit einer Ausführung des
Gehäusedeckels sowohl eine rechts- als auch eine linkslaufende
Förderpumpe bestückt werden kann, so daß der Fertigungsaufwand
verringert ist. Je nach Drehlage des Gehäusedeckels münden die
jeweiligen Queröffnungen entweder in den links liegenden
Pumpkammerraum oder den rechts liegenden Pumpkammerraum. Auf diese
Weise läßt sich bei Beibehaltung der Wirkrichtung des in den
Bypasskanals eingesetzten Druckventils durch einfaches Verdrehen des
Gehäusedeckels ein Rechts- oder ein Linkslauf der Förderpumpe
ermöglichen. The feed pump according to the invention with the features according to
Die Einlaß- und Auslaßöffnungen bzw. Ansaug- und
Drucköffnungen der Pumpkammer sind dabei in vorteilhafter
Weise auf der Berührungslinie der Zahnräder angeordnet und
münden damit ebenfalls in beiden Montagelagen sicher in den
jeweiligen Pumpkammerraum. Dabei ist es vorteilhaft die
Zulaufleitung oder die Ansaugöffnung mit einer
Querschnittsverengung zu versehen, die eine entsprechend
abzustimmende Saugdrossel bildet.
Für unterschiedliche Anforderungen kann zudem ein zweiter
Bypasskanal im Pumpendeckel vorgesehen sein, der dann auf
der gegenüberliegenden Seite jenseits der Berührungslinie
der Zahnräder im Pumpendeckel angeordnet ist.
Die erfindungsgemäße Förderpumpe ist dabei besonders zur
Förderung von Kraftstoff aus einem Vorratstank zu einer
Kraftstoffeinspritzpumpe einer Brennkraftmaschine geeignet,
kann aber auch zur Förderung anderer flüssiger Fördermedien
verwendet werden.
Weitere Vorteile und vorteilhafte Ausgestaltungen des
Gegenstandes der Erfindung sind der Beschreibung, der
Zeichnung und den Ansprüchen entnehmbar.The inlet and outlet openings or suction and pressure openings of the pumping chamber are advantageously arranged on the line of contact of the gearwheels and thus also lead securely into the respective pumping chamber space in both mounting positions. It is advantageous to provide the inlet line or the suction opening with a cross-sectional constriction, which forms a suction throttle to be adjusted accordingly.
For different requirements, a second bypass channel can also be provided in the pump cover, which is then arranged on the opposite side beyond the line of contact of the gearwheels in the pump cover.
The feed pump according to the invention is particularly suitable for delivering fuel from a storage tank to a fuel injection pump of an internal combustion engine, but can also be used for delivering other liquid delivery media.
Further advantages and advantageous embodiments of the subject matter of the invention can be found in the description, the drawing and the claims.
Ein Ausführungsbeispiel der erfindungsgemäßen Förderpumpe
ist in der Zeichnung dargestellt und wird in der folgenden
Beschreibung näher erläutert.
Es zeigen die Figur 1 eine Ansicht auf die Deckelseite der
Förderpumpe mit herausgeschnittenem Bypasskanal und der
Darstellung der Lage der Zahnräder und die Figur 2 eine
Schnittdarstellung der Förderpumpe in einer um 90° zur Figur
1 gedrehten Ansicht.An embodiment of the feed pump according to the invention is shown in the drawing and is explained in more detail in the following description.
FIG. 1 shows a view of the cover side of the feed pump with the bypass channel cut out and the
Representation of the position of the gears and Figure 2 is a sectional view of the feed pump in a view rotated by 90 ° to Figure 1.
Die in den Figuren 1 und 2 in zwei Ansichten dargestellte
erfindungsgemäße Förderpumpe ist in eine nicht dargestellte
Förderleitung von einem Vorratstank zu einer
Kraftstoffeinspritzpumpe für Brennkraftmaschinen eingesetzt.
Dabei weist das in den Figuren 1 und 2 dargestellte
Ausführungsbeispiel der Förderpumpe in ihrem Gehäuse 1 eine
Pumpkammer 3 auf, in der ein rotierend angetriebenes Paar
miteinander kämmender Zahnräder angeordnet ist.
Ein erstes im Ausführungsbeispiel untenliegendes Zahnrad 5
wird dabei mittels eines nicht genauer dargestellten
externen Antriebselementes 7 rotierend angetrieben und
überträgt diese Drehbewegung über eine Stirnverzahnung auf
ein, mit dem ersten Zahnrad 5 kämmendes zweites Zahnrad 9.
Die Zahnräder 5, 9 teilen dabei die Pumpkammer 3 durch ihren
Zahneingriff in zwei Teilbereiche, von denen ein erster
Teilbereich einen Ansaugraum 11 und ein zweiter Teil einen
Druckraum 13 bilden.
Der Ansaugraum 11 ist dabei über je einen zwischen den
Zahnnuten an den Stirnflächen des ersten und zweiten
Zahnrades 5, 9 und der oberen und unteren Umfangswand der
Pumpkammer 3 gebildeten Förderkanal 15 mit dem Druckraum 13
verbunden. Zudem weisen der Ansaugraum 11 und der Druckraum
13 jeweils eine Anschlußöffnung in der Wand des
Pumpengehäuses 1 auf, über die der Ansaugraum 11 mit einer
nicht dargestellten Ansaugleitung vom Vorratstank und der
Druckraum 13 mit einer ebenfalls nicht dargestellten
Förderleitung zum Saugraum der Kraftstoffeinspritzpumpe
verbunden ist. Dabei bildet die Anschlußöffnung in den
Ansaugraum 11 eine Ansaug- bzw. Einlaßöffnung 17 und die
Anschlußöffnung in den Druckraum 13 eine Druck- bzw.
Auslaßöffnung 19, die in einem, die Pumpkammer 3
verschließenden Gehäusedeckel 21 angeordnet sind, wobei die
Einlaßöffnung eine nicht näher dargestellte
Querschnittsverringerung aufweist, die eine Saugdrossel
bildet.
Die Zahnräder 5, 9 sind auf in das Innere des Pumpengehäuses
1 ragenden Gehäusezapfen gelagert, die einteilig mit dem
Pumpengehäuse 1 ausgebildet sind. Dabei bildet ein erster
untenliegender Gehäusezapfen 23 einen das erste Zahnrad 5
aufnehmenden Lagerzapfen und ein zweiter obenliegender
Gehäusezapfen 25 einen das zweite Zahnrad 9 aufnehmenden
Lagerzapfen.
Der erste Gehäusezapfen 23 weist eine axiale
Durchgangsbohrung 27 auf, in der eine Antriebswelle 29
geführt ist, die an ihrem dem Gehäusedeckel 21 abgewandten
Ende drehschlüssig mit dem Antriebselement 7 verbunden ist.
An ihrem dem Antriebselement 7 fernen Ende ragt die
Antriebswelle 29 aus der Bohrung 27 des ersten
Gehäusezapfens 23 in ein Koppelglied 31 zum ersten Zahnrad
5, über das die Drehbewegung der Antriebswelle 29 auf das
Zahnrad 5 übertragen wird.
Für eine Drucksteuerung des Förderdruckes im Druckraum 13
und somit zur Fördermengenregelung ist zudem ein Bypasskanal
41 vorgesehen. Dieser den Druckraum 13 mit dem Ansaugraum 11
verbindende Bypasskanal 41 ist dabei im Gehäusedeckel 21
angeordnet und wird durch eine senkrecht zur Achse der
Zahnräder 5, 9 verlaufende Längsbohrung 43 im Gehäusedeckel
21 gebildet. Die Längsbohrung 43 ist dabei als
Sacklochbohrung ausgeführt, deren offenes Ende mittels eines
Verschlußstopfes 45 oder alternativ mittels einer Kugel
verschlossen ist. Die Längsbohrung 43 ist dabei nahe
unterhalb einer Berührungslinie der miteinander kämmenden
Zahnräder 5, 9 angeordnet, an der die Pumpkammer 3 in den
Ansaugraum 11 und den Druckraum 13 getrennt wird, schneidet
diese Berührungslinie jedoch nicht.
An den Enden der Längsbohrung 43 führt jeweils eine
Queröffnung in die Pumpkammer 3, wobei eine erste
Queröffnung 47 in den im Ausführungsbeispiel links liegenden
Ansaugraum 11 und eine zweite Queröffnung 49 in den rechts
liegenden Druckraum 13 mündet.
Am druckraumseitigen Ende weist die Längsbohrung 43 des
Bypasskanals 41 eine durch einen Absatz gebildete
Querschnittsverringerung in Richtung Druckraum 13 auf, die
einen Ventilsitz 51 eines in den Bypasskanal 41
eingesetzten, in Richtung Ansaugraum 11 öffnenden
Druckventils 53 bildet. An diesen Ventilsitz 51 kommt ein
scheibenförmiges Ventilschließglied 55 des Druckventils 53
dichtend zur Anlage, das auf seiner ventilsitzabgewandten
Seite von einer Ventilfeder 57 beaufschlagt ist. Diese am
Ventilschließglied 55 angreifende, als Druckfeder
ausgebildete Ventilfeder 57 stützt sich andererseits an der
Ringstirnfläche einer in das saugraumseitige Ende der
Längsbohrung 43 eingepreßten geschlitzten Spannhülse 59 ab,
über deren axiale Eintauchtiefe die Vorspannkraft der
Ventilfeder 57 einstellbar ist.
Dabei ist die erste Queröffnung 47 im Bereich der
Überdeckung mit der Spannhülse 59 und die zweite Queröffnung
49 im sich druckraumseitig an den Ventilsitz 51
anschließenden Bohrungsbereich der Längsbohrung 43
angeordnet.
In der Figur 1 ist dabei eine sogenannte rechtslaufende
Förderpumpe dargestellt, in der die Antriebswelle 29 im
Uhrzeigersinn umläuft (an entgegengesetzter Deckelseite
gegenläufiger Drehsinn), wobei der Ansaugraum 11 links und
der Druckraum 13 rechts liegend in der Deckelansicht
angeordnet sind.
Wird nunmehr die Drehrichtung der Antriebswelle 29
umgekehrt, wirkt der rechte Raum (vormals Druckraum) der
Pumpkammer 3 nunmehr als Ansaugraum und der linke Raum
(vormals Ansaugraum) als Druckraum.
Um weiterhin eine Drucksteuerung über das Bypassventil
vornehmen zu können, wird nunmehr der Gehäusedeckel 21
abgenommen und um 180° um die Pumpachse gedreht wieder
montiert, so daß die Längsbohrung 43 des Bypasskanals 41
nunmehr oberhalb der Berührungslinie der Zahnräder 5,9
angeordnet sind. Dabei mündet die nunmehr seitenvertauschte
erste Queröffnung 47 erneut in den Ansaugraum 11 und die
zweite Queröffnung 49 erneut in den Druckraum 13.The feed pump according to the invention shown in two views in FIGS. 1 and 2 is inserted into a feed line (not shown) from a storage tank to a fuel injection pump for internal combustion engines. The exemplary embodiment of the feed pump shown in FIGS. 1 and 2 has a pump chamber 3 in its
A first gearwheel 5, which is located in the exemplary embodiment, is rotatably driven by means of an external drive element 7 (not shown in more detail) and transmits this rotary movement via a spur toothing to a
The
Outlet opening 19, which are arranged in a
The
The
At its end remote from the drive element 7, the drive shaft 29 protrudes from the
A
Blind hole executed, the open end of which is closed by means of a
At the ends of the
At the end on the pressure chamber side, the
The first transverse opening 47 is arranged in the area of the overlap with the
1 shows a so-called right-hand delivery pump, in which the drive shaft 29 rotates clockwise (on the opposite side of the cover in the opposite direction), the
If the direction of rotation of the drive shaft 29 is now reversed, the right-hand space (formerly pressure chamber) of pumping chamber 3 now acts as a suction space and the left-hand space (formerly suction space) acts as a pressure space.
In order to be able to continue to control the pressure via the bypass valve, the
Die erfindungsgemäße Förderpumpe arbeitet in folgender
Weise. Im Betrieb der Förderpumpe wird die Antriebswelle 29
vorzugsweise proportional zur Drehzahl einer zu versorgenden
Brennkraftmaschine rotierend angetrieben. Die Antriebswelle
29 überträgt die Drehbewegung über das Koppelglied 31 auf
das erste Zahnrad 5, das seinerseits das zweite mit ihm
kämmende Zahnrad 9 rotierend antreibt. Durch die
Drehbewegungen der miteinander kämmenden Zahnräder 5, 9 wird
das Fördermedium, vorzugsweise Kraftstoff aus dem Ansaugraum
11 entlang der Förderkanäle 15 in den Druckraum 13
gefördert. Dabei entsteht im Ansaugraum 11 ein Unterdruck,
derausreicht, weiteren Kraftstoff über die Ansaugleitung aus
dem Vorratstank anzusaugen. Der im Druckraum 13 aufgebaute
Kraftstoffdruck bewirkt eine Kraftstoff-Förderung über die
Auslaßöffnung 19 in die Förderleitung zur
Kraftstoffeinspritzpumpe.
Dabei erfolgt die Steuerung des maximalen Förderdrucks und
der maximalen Fördermenge an der Auslaßöffnung 17 zur
Förderleitung über den Bypasskanal 41, indem das
Ventilschließglied 55 des darin eingesetzten Druckventils 53
ab einem bestimmten Druck im Druckraum 13 vom Ventilsitz 51
abhebt und so einen Abströmquerschnitt am Bypasskanal 41
öffnet, über den ein Teil der unter Druck stehenden
Fördermenge aus dem Druckraum 13 in den Ansaugraum 11
abströmt, wobei sich über die Vorspannkraft der Ventilfeder
57 der Öffnungsdruck des Druckventils 53 einstellen läßt.The feed pump according to the invention works in the following way. In the operation of the feed pump, the drive shaft 29 is preferably driven to rotate in proportion to the speed of an internal combustion engine to be supplied. The drive shaft 29 transmits the rotary movement via the
The control of the maximum delivery pressure and the maximum delivery rate at the outlet opening 17 to the delivery line via the
Claims (10)
- Feed pump having a pair of intermeshing gears (5, 9) which are driven in a rotary manner in a pump chamber (3) and which deliver a fluid medium from an intake space (11) connected to a supply tank along a feed passage (15) formed between the end face of the gears (5, 9) and the peripheral wall of the pump chamber (3) into a pressure space (13), and having a bypass passage (41) which connects the intake space (11) to the pressure space (13) and can be opened in a controlled manner by means of a pressure valve (53) arranged therein, the bypass passage (41) accommodating the pressure valve (53) being arranged in a housing lid (21) closing the housing (1) of the feed pump, the bypass passage (41) being designed as a longitudinal bore (43) in the housing lid (21), this longitudinal bore (43) running perpendicularly to the axis of the gears (5, 9) and being connected via one transverse opening each to the intake space (11) and the pressure space (13) of the pump chamber (3), and the longitudinal bore (43) of the bypass passage (41) being arranged in the housing lid (21) in such a way that, in a first fitted position of the housing lid (21) on the pump housing (1), a first transverse opening (47) opens into the intake space (11) and the second transverse opening (49) opens into the pressure space (13), characterized in that the bypass passage (41) is arranged in the housing lid (21) in such a way that the transverse openings (47, 49) starting from the longitudinal bore (43) open into the different spaces (11, 13) of the pump chamber (3) even after the housing lid (21) is fitted on the pump housing (1) in such a way as to be rotated by 180° about the pump axis.
- Feed pump according to Claim 1, characterized in that the first and second transverse openings (47, 49) in each case open into the spatially opposed space of the pump chamber (3) after the housing lid (21) is fitted in such a way as to be rotated by 180° about the pump axis.
- Feed pump according to Claim 1, characterized in that the bypass passage (41) is arranged close to the contact line of the intermeshing gears (5, 9).
- Feed pump according to Claim 1, characterized in that the bypass passage (41), at its end on the pressure-space side, has a cross-sectional reduction which forms a valve seat surface (51) and against which a valve closing member (55) of the pressure valve (53) can be brought to bear with a sealing face by means of a valve spring (57) which is supported on the other side on a clamping sleeve (59) inserted into the suction-space-side end of the bypass passage (41).
- Feed pump according to Claim 4, characterized in that the clamping sleeve (59) is of split design, and in that the first transverse opening (47) of the bypass passage (41) branches off from the longitudinal bore (43) in the housing lid at the level of the clamping sleeve (59), and the second transverse opening (49) branches off from the longitudinal bore (43) in the housing lid on that side of the valve seat (51) which is remote from the valve spring (57).
- Feed pump according to Claim 1, characterized in that the longitudinal bore (43), forming the bypass passage (41), in the housing lid (21) is designed as a blind hole, the open end of which is closed by a sealing element, preferably a sealing plug (45).
- Feed pump according to Claim 1, characterized in that an intake opening (17) opening into the intake space (11) and a pressure opening (19) opening into the pressure space (13) are arranged in the housing lid (21).
- Feed pump according to Claim 7, characterized in that the intake opening (17) and the pressure opening (19) are arranged in the housing lid (21) at the level of the contact line of the intermeshing gears (5, 9).
- Feed pump according to Claim 7, characterized in that a cross-sectional constriction forming a suction throttle is provided in the intake opening (17).
- Feed pump according to Claim 1, characterized in that fuel is delivered from a fuel supply tank to a fuel injection pump of an internal combustion engine.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19638335 | 1996-09-19 | ||
DE19638335A DE19638335C2 (en) | 1996-09-19 | 1996-09-19 | Feed pump |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0831231A2 EP0831231A2 (en) | 1998-03-25 |
EP0831231A3 EP0831231A3 (en) | 1999-03-03 |
EP0831231B1 true EP0831231B1 (en) | 2003-01-08 |
Family
ID=7806190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97114967A Expired - Lifetime EP0831231B1 (en) | 1996-09-19 | 1997-08-29 | Gear pump |
Country Status (3)
Country | Link |
---|---|
US (1) | US6116859A (en) |
EP (1) | EP0831231B1 (en) |
DE (2) | DE19638335C2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010050163A1 (en) | 2010-10-30 | 2012-05-03 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Displacement machine for combustion engine of motor vehicle, has nozzle that is arranged at one end of return line to re-circulate pressurized fluid injected in direction of suction opening so that displacement is accelerated |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19913406A1 (en) * | 1999-03-25 | 2000-04-20 | Bosch Gmbh Robert | Fuel feed pump to feed fuel from an intake chamber into a pressure chamber contains regulator piston to influence hydraulic pump action, and is without bypass channel |
DE19913804A1 (en) * | 1999-03-26 | 2000-09-28 | Bosch Gmbh Robert | Fuel feed pump |
DE10002613A1 (en) * | 2000-01-22 | 2001-07-26 | Volkswagen Ag | Fuel supply for a motor vehicle internal combustion engine |
DE102005042040B3 (en) * | 2005-09-02 | 2007-05-16 | Fresenius Medical Care De Gmbh | gear pump |
US8360746B2 (en) * | 2006-05-10 | 2013-01-29 | Metaldyne Company, Llc | Inverted pressure regulating valve for an engine oil pump |
DE102022202606A1 (en) | 2022-03-16 | 2023-09-21 | Robert Bosch Gesellschaft mit beschränkter Haftung | Fuel delivery device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2276107A (en) * | 1939-05-09 | 1942-03-10 | John P Simons | Gear pump |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA711046A (en) * | 1965-06-08 | Dresser Industries | Pressure relief means for pump | |
DE1170786B (en) * | 1959-07-21 | 1964-05-21 | Friedrich Reichert Maschf | Gear pump suitable for both directions of rotation |
DE2254316A1 (en) * | 1972-11-06 | 1974-05-16 | Agfa Gevaert Ag | COMBINED REGULATING AND PRESSURE RELIEF VALVE |
DE7507541U (en) * | 1975-03-11 | 1976-09-23 | Werdohler Pumpenfabrik, Rudolf Rickmeier Gmbh, 5980 Werdohl | GEAR PUMP |
ES445021A1 (en) * | 1976-02-10 | 1977-06-01 | Bendiberica Sa | Gear pump |
US4902202A (en) * | 1987-07-29 | 1990-02-20 | Hydreco, Inc. | Variable discharge gear pump with energy recovery |
US5338161A (en) * | 1991-06-19 | 1994-08-16 | Dana Corporation | Gear pump having internal bypass valve |
US5236317A (en) * | 1991-09-26 | 1993-08-17 | Permco, Inc. | Gear pump valving system |
FR2706541B1 (en) * | 1993-06-11 | 1995-09-08 | Renault Vehicules Ind | Method for regulating the pressure and discharge flow of a positive displacement pump and positive displacement pump for implementing the method. |
DE4441505A1 (en) * | 1994-11-22 | 1996-05-23 | Bosch Gmbh Robert | Fuel feed pump for a fuel injection pump for internal combustion engines |
-
1996
- 1996-09-19 DE DE19638335A patent/DE19638335C2/en not_active Expired - Fee Related
-
1997
- 1997-08-29 DE DE59709077T patent/DE59709077D1/en not_active Expired - Fee Related
- 1997-08-29 EP EP97114967A patent/EP0831231B1/en not_active Expired - Lifetime
- 1997-09-19 US US08/934,140 patent/US6116859A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2276107A (en) * | 1939-05-09 | 1942-03-10 | John P Simons | Gear pump |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010050163A1 (en) | 2010-10-30 | 2012-05-03 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Displacement machine for combustion engine of motor vehicle, has nozzle that is arranged at one end of return line to re-circulate pressurized fluid injected in direction of suction opening so that displacement is accelerated |
Also Published As
Publication number | Publication date |
---|---|
DE19638335C2 (en) | 2000-07-20 |
US6116859A (en) | 2000-09-12 |
DE59709077D1 (en) | 2003-02-13 |
EP0831231A2 (en) | 1998-03-25 |
EP0831231A3 (en) | 1999-03-03 |
DE19638335A1 (en) | 1998-04-02 |
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