WO1992015785A1 - Fuel-feed unit for supplying fuel from a vehicle fuel tank to the engine - Google Patents

Fuel-feed unit for supplying fuel from a vehicle fuel tank to the engine Download PDF

Info

Publication number
WO1992015785A1
WO1992015785A1 PCT/DE1992/000165 DE9200165W WO9215785A1 WO 1992015785 A1 WO1992015785 A1 WO 1992015785A1 DE 9200165 W DE9200165 W DE 9200165W WO 9215785 A1 WO9215785 A1 WO 9215785A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
pump
unit according
ceramic material
housing
Prior art date
Application number
PCT/DE1992/000165
Other languages
German (de)
French (fr)
Inventor
Hans-Ulrich Gruber
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1992015785A1 publication Critical patent/WO1992015785A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • 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 invention relates to a conveyor unit according to the type of the main claim.
  • a delivery unit on the market where all parts of the delivery pump are made of metal.
  • undesirable noises occur when the pump is rotating, which are caused, for example, by the metallic pump parts touching one another. These noises are particularly disturbing when the pump is used in a motor vehicle because it is amplified via the fuel tank and / or the vehicle body.
  • the conveyor unit according to the invention with the characterizing features of the main claim has the advantage that the unpleasant, undesirable noise is at least greatly reduced.
  • FIG. 1 shows the principle of a fuel delivery system of a motor vehicle, with a storage tank, a delivery unit shown partially and in section and with an internal combustion engine, in an unscaled representation
  • FIG. 2 shows a section through a delivery pump arranged in the delivery unit, along the line II-II.
  • a fuel delivery system shown in FIG. 1 has a fuel storage tank 10, from which a suction line 12 leads to the suction port 14 of a delivery unit 16.
  • the delivery unit 16 has a pressure port, not shown, via which the delivered fuel enters a pressure line 18, which leads to the internal combustion engine 20 of a motor vehicle.
  • the delivery unit 16 has an electric drive motor 22 which drives a delivery pump 24.
  • the feed pump 24 is designed as a so-called internal gear pump. It draws the fuel in from the storage tank 10 via the intake port 14 and presses it in the direction of the arrow 26 into a space 28 within the delivery unit 16, in which the electric drive motor 22 is accommodated.
  • a motor armature belonging to the electric motor 22 thus rotates in the fuel being pumped.
  • the conveyor unit 16 is a so-called
  • Inline unit with an attachment outside the fuel tank used.
  • this unit is also conceivable to use this unit as a so-called intank unit.
  • the delivery unit 18 is located within the storage tank 10, so that the suction line 12 can be omitted.
  • the feed pump 24 has a base plate 30 which, in the exemplary embodiment, also forms the end cover of a housing tube 32.
  • a second, so-called bearing cover 34 closes the other opening of the housing tube 32.
  • the housing parts 30, 32 and 34 enclose both the feed pump 24 and the electric motor 22.
  • the base plate 30 has a bearing pin 36 which is used to mount a pinion 38 belonging to the internal gear pump 24.
  • the toothing 40 of the toothed pinion 38 meshes with an internal toothing 42 of a toothed ring 44, the lateral surface 46 of which is guided in a bore 48 of a so-called annular intermediate or support plate 50.
  • On the end ring surface of the support ring 50 facing away from the base plate 30 lies one side of a cover plate 52, which in the exemplary embodiment simultaneously forms a bearing for an armature shaft 54 belonging to the electric motor 22.
  • the components 30, 50, 52 arranged fixed to the frame thus form, as it were, a pump housing or a chamber in which the conveying means 38, 44 moved by the drive motor 22 circulate.
  • the end of the armature shaft 54 facing the feed pump 24 passes through the cover plate 52 and engages with a driver 56 in the pinion 38 of the feed pump 24.
  • the pinion 38 of the internal gear pump 24 is driven so that it rotates on the journal 36. Via the toothing 40, the pinion 38 takes the toothed ring 44 with it, so that the internal gear pump 24 operates in a manner known per se. So that the undesirable noise formation of such pumps is at least greatly reduced, at least some of the parts 30, 50, 52, which form the multi-part pump housing 60, which is fixed in the housing 32, are made of a ceramic material. Depending on the application, the person skilled in the art will manufacture the base plate 30 and / or the cover plate 52 and / or the support plate 50 from the ceramic material. It is also conceivable to manufacture the support plate 50 in one piece with the base plate 30 or in one piece with the cover plate 52.
  • a partially stabilized zirconium dioxide is particularly suitable for producing the pump housing parts 30, 50, 52 mentioned.

Abstract

A unit (16) is disclosed for supplying fuel from a tank (10) to the internal combustion engine (20) of a motor vehicle. The fuel-feed unit (16) proposed comprises an electric drive motor (22) and a pump (24) driven by the motor. The pump has a housing (60) which forms a chamber and which is rigidly joined to the casing of the fuel-feed unit. Propellant means in the chamber formed by the pump housing are rotated by the drive motor. The noise levels of the fuel-feed unit are particularly low if at least part of the multicomponent-construction pump housing is made of a ceramic material.

Description

Aσσreσat zum Fördern von Kraftstoff aus einem Vorratstank zur Brennkraftmaschine eines KraftfahrzeugesAσσreσat for conveying fuel from a storage tank to the internal combustion engine of a motor vehicle
Stand der TechnikState of the art
Die Erfindung geht aus von einem Förderaggregat nach der Gattung des Hauptanspruchs. Es ist schon ein Förderaggregat im Handel, bei dem alle Teile der Förderpumpe aus Metall hergestellt sind. Eine solche Pumpe ist zwar recht verschleißfest, doch entstehen bei umlaufender Pumpe unerwünschte Geräusche, welche beispielsweise durch die einander berührenden, metallischen Pumpenteile verursacht werden. Diese Geräusche stören besonders dann, wenn die Pumpe in einem Kraftfahrzeug Verwendung findet, weil sie über den Kraftstofftank und/oder die Fahrzeugkarosserie verstärkt werden.The invention relates to a conveyor unit according to the type of the main claim. There is already a delivery unit on the market where all parts of the delivery pump are made of metal. Although such a pump is quite wear-resistant, undesirable noises occur when the pump is rotating, which are caused, for example, by the metallic pump parts touching one another. These noises are particularly disturbing when the pump is used in a motor vehicle because it is amplified via the fuel tank and / or the vehicle body.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Förderaggregat mit den kennzeichnenden Merk¬ malen des Hauptanspruchs hat demgegenüber den Vorteil, daß die unangenehme, unerwünschte Geräuschbildung zumindest stark gesenkt wird.The conveyor unit according to the invention with the characterizing features of the main claim has the advantage that the unpleasant, undesirable noise is at least greatly reduced.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor¬ teilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Förderaggregats möglich. Besonders vorteilhaft ist es, als keramischen Werkstoff für die Teile des Pumpengehäuses ein teil¬ stabilisiertes Zirkon-Dioxid zu wählen, weil dieses eine besonders hohe mechanische Festigkeit und hohe Verschleißfestigkeit aufweist.The measures listed in the subclaims result in advantageous further developments and improvements in the main claim specified delivery unit possible. It is particularly advantageous to choose a partially stabilized zirconium dioxide as the ceramic material for the parts of the pump housing, because this has a particularly high mechanical strength and high wear resistance.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung darge¬ stellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 das Prinzip einer Kraftstofförderanlage eines Kraft¬ fahrzeuges, mit einem Vorratstank, einem teilweise und geschnitten dargestellten Förderaggregat sowie mit einer Brennkraftmaschine, in unmaßstäblicher Darstellung und Figur 2 einen Schnitt durch eine im Förderaggregat angeordnete Förderpumpe, entlang der Linie II-II.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows the principle of a fuel delivery system of a motor vehicle, with a storage tank, a delivery unit shown partially and in section and with an internal combustion engine, in an unscaled representation, and FIG. 2 shows a section through a delivery pump arranged in the delivery unit, along the line II-II.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Eine in Figur 1 dargestellte Kraftstofförderanlage hat einen Kraft¬ stoff-Vorratstank 10, von dem aus eine Saugleitung 12 zum Saug¬ stutzen 14 eines Förderaggregats 16 führt. Das Förderaggregat 16 hat einen nicht näher dargestellten Druckstutzen über den der geförderte Kraftstoff in eine Druckleitung 18 gelangt, welcher zur Brennkraft¬ maschine 20 eines Kraftfahrzeuges führt. Das Förderaggregat 16 weist einen elektrischen Antriebsmotor 22 auf, der eine Förderpumpe 24 antreibt. Die Förderpumpe 24 ist als sogenannte Innenzahnradpumpe ausgebildet. Sie saugt den Kraftstoff über den Ansaugstutzen 14 aus dem Vorratstank 10 an und drückt diesen in Richtung des Pfeiles 26 in einen Raum 28 innerhalb des Förderaggregats 16, in welchem der elektrische Antriebsmotor 22 untergebracht ist. Ein zum Elektromotor 22 gehörender Motoranker läuft also im geförderten Kraftstoff um. Wie Figur 1 zeigt, ist das Förderaggregat 16 als sogenanntesA fuel delivery system shown in FIG. 1 has a fuel storage tank 10, from which a suction line 12 leads to the suction port 14 of a delivery unit 16. The delivery unit 16 has a pressure port, not shown, via which the delivered fuel enters a pressure line 18, which leads to the internal combustion engine 20 of a motor vehicle. The delivery unit 16 has an electric drive motor 22 which drives a delivery pump 24. The feed pump 24 is designed as a so-called internal gear pump. It draws the fuel in from the storage tank 10 via the intake port 14 and presses it in the direction of the arrow 26 into a space 28 within the delivery unit 16, in which the electric drive motor 22 is accommodated. A motor armature belonging to the electric motor 22 thus rotates in the fuel being pumped. As Figure 1 shows, the conveyor unit 16 is a so-called
Inline-Aggregat, mit einem Anbau außerhalb des Kraftstofftanks eingesetzt. Es ist jedoch auch denkbar, dieses Aggregat als soge¬ nanntes Intank-Aggregat zu verwenden. In diesem Fall befindet sich das Förderaggregat 18 innerhalb des Vorratstanks 10, so daß die Saugleitung 12 entfallen kann.Inline unit, with an attachment outside the fuel tank used. However, it is also conceivable to use this unit as a so-called intank unit. In this case, the delivery unit 18 is located within the storage tank 10, so that the suction line 12 can be omitted.
Aus Figur 1 ist weiter ersichtlich, daß die Förderpumpe 24 eine Grundplatte 30 aufweist, die beim Ausführungsbeispiel gleichzeitig den einen Abschlußdeckel eines Gehäuserohres 32 bildet. Ein zweiter, sogenannter Lagerdeckel 34 verschließt die andere Öffnung des Gehäuserohres 32. Die Gehäuseteile 30, 32 und 34 umschließen sowohl die Förderpumpe 24 als auch den Elektromotor 22.It can also be seen from FIG. 1 that the feed pump 24 has a base plate 30 which, in the exemplary embodiment, also forms the end cover of a housing tube 32. A second, so-called bearing cover 34 closes the other opening of the housing tube 32. The housing parts 30, 32 and 34 enclose both the feed pump 24 and the electric motor 22.
Weiter ist aus Figur 1 ersichtlich, daß die Grundplatte 30 einen Lagerzapfen 36 aufweist, der zur Lagerung eines zur Innenzahnrad¬ pumpe 24 gehörenden Zahnritzels 38 dient. Die Verzahnung 40 des Zahnritzels 38 kämmt mit einer Innenverzahnung 42 eines Zahnrings 44, dessen Mantelfläche 46 in einer Bohrung 48 einer sogenannten, ringförmigen Zwischen- oder Stützplatte 50 geführt ist. Auf der von der Grundplatte 30 abgewandten Stirn-Ringfläche des Stützrings 50 liegt die eine Seite einer Abdeckplatte 52 an, welche beim Ausfüh¬ rungsbeispiel gleichzeitig eine Lagerung für eine zum Elektromotor 22 gehörende Ankerwelle 54 bildet. Die gestellfest angeordneten Bauteile 30, 50, 52 bilden also gewissermaßen ein Pumpengehäuse oder eine Kammer, in welcher die von dem Antriebsmotor 22 bewegten Fördermittel 38, 44 umlaufen. Das der Förderpumpe 24 zugewandte Ende der Ankerwelle 54 durchsetzt die Abdeckplatte 52 und greift » mit einem Mitnehmer 56 in das Ritzel 38 der Förderpumpe 24.It can also be seen from FIG. 1 that the base plate 30 has a bearing pin 36 which is used to mount a pinion 38 belonging to the internal gear pump 24. The toothing 40 of the toothed pinion 38 meshes with an internal toothing 42 of a toothed ring 44, the lateral surface 46 of which is guided in a bore 48 of a so-called annular intermediate or support plate 50. On the end ring surface of the support ring 50 facing away from the base plate 30 lies one side of a cover plate 52, which in the exemplary embodiment simultaneously forms a bearing for an armature shaft 54 belonging to the electric motor 22. The components 30, 50, 52 arranged fixed to the frame thus form, as it were, a pump housing or a chamber in which the conveying means 38, 44 moved by the drive motor 22 circulate. The end of the armature shaft 54 facing the feed pump 24 passes through the cover plate 52 and engages with a driver 56 in the pinion 38 of the feed pump 24.
Während des Betriebs des Elektromotors 22 wird das Ritzel 38 der Innenzahnradpumpe 24 angetrieben, so daß es sich auf dem Lagerzapfen 36 dreht. Über die Verzahnung 40 nimmt das Ritzel 38 den Zahnring 44 mit, so daß die Innenzahnradpumpe 24 in an sich bekannter Weise arbeitet. Damit die unerwünschte Geräuschbildung solcher Pumpen zumindest stark vermindert wird, sind wenigstens einige der Teile 30, 50, 52, welche das mehrteilig aufgebaute, fest im Gehäuse 32 angeordnete Pumpengehäuse 60 bilden, aus einem keramischen Werkstoff herge¬ stellt. Je nach Anwendungsfall wird der Fachmann die Grundplatte 30 und/oder die Abdeckplatte 52 und/oder die Stützplatte 50 aus dem keramischen Werkstoff herstellen. Es ist auch denkbar die Stütz¬ platte 50 einstückig mit der Grundplatte 30 oder einstückig mit der Abdeckplatte 52 herzustellen.During operation of the electric motor 22, the pinion 38 of the internal gear pump 24 is driven so that it rotates on the journal 36. Via the toothing 40, the pinion 38 takes the toothed ring 44 with it, so that the internal gear pump 24 operates in a manner known per se. So that the undesirable noise formation of such pumps is at least greatly reduced, at least some of the parts 30, 50, 52, which form the multi-part pump housing 60, which is fixed in the housing 32, are made of a ceramic material. Depending on the application, the person skilled in the art will manufacture the base plate 30 and / or the cover plate 52 and / or the support plate 50 from the ceramic material. It is also conceivable to manufacture the support plate 50 in one piece with the base plate 30 or in one piece with the cover plate 52.
Wegen seiner hohen mechanischen Festigkeit ist zur Herstellung der erwähnten Pumpengehäuseteile 30, 50, 52 ein teilstabilisiertes Zirkon-Dioxid besonders geeignet. Because of its high mechanical strength, a partially stabilized zirconium dioxide is particularly suitable for producing the pump housing parts 30, 50, 52 mentioned.

Claims

Ansprüche Expectations
1. Aggregat zum Fördern von Kraftstoff aus einem Vorratstank zur Brennkraftmaschine eines Kraftfahrzeuges, mit einem elektrischen Antriebsmotor und einer von diesem angetriebenen Förderpumpe, die ein mit einem Aggregatgehäuse fest verbundenes, eine Kammer bilden¬ des Pumpengehäuse hat, in dem von dem Antriebsmotor bewegte Förder¬ mittel der Pumpe umlaufen, dadurch gekennzeichnet, daß zumindest Teile des mehrteilig aufgebauten Pumpengehäuses (60) aus einem keramischen Werkstoff hergestellt sind.1. Unit for conveying fuel from a storage tank to the internal combustion engine of a motor vehicle, with an electric drive motor and a feed pump driven by the latter, which has a chamber connected to a unit housing, forming a chamber of the pump housing, in the conveyor motor moved by the drive motor circulate by means of the pump, characterized in that at least parts of the multi-part pump housing (60) are made of a ceramic material.
2. Förderaggregat nach Anspruch 1, dadurch gekennzeichnet, daß die Förderpumpe als Innenzahnradpumpe (24) ausgebildet ist, deren Gehäuse (60) eine Grundplatte (30), eine Stützplatte (50) und eine Abdeckplatte (52) aufweist.2. Delivery unit according to claim 1, characterized in that the feed pump is designed as an internal gear pump (24) whose housing (60) has a base plate (30), a support plate (50) and a cover plate (52).
3. Förderaggregat nach Anspruch 2, dadurch gekennzeichnet, daß die Grundplatte (30) aus dem keramischen Werkstoff besteht.3. Conveyor unit according to claim 2, characterized in that the base plate (30) consists of the ceramic material.
4. Förderaggregat nach einem der Ansprüche 2 oder 3, dadurch gekenn¬ zeichnet, daß die Abdeckplatte (52) aus dem keramischen Werkstoff besteht. 4. Conveyor unit according to one of claims 2 or 3, characterized gekenn¬ characterized in that the cover plate (52) consists of the ceramic material.
5. Förderaggregat nach einem der Ansprüche 2 bis 4, dadurch gekenn¬ zeichnet, daß die Stützplatte (50) aus dem keramischen Werkstoff besteht.5. Conveyor unit according to one of claims 2 to 4, characterized gekenn¬ characterized in that the support plate (50) consists of the ceramic material.
6. Förderaggregat nach einem der Ansprüche 2 bis 5, dadurch gekenn¬ zeichnet, daß die Stützplatte (50) einstückig mit der Grundplatte (30) verbunden ist.6. Conveyor unit according to one of claims 2 to 5, characterized gekenn¬ characterized in that the support plate (50) is integrally connected to the base plate (30).
7. Förderaggregat nach einem der Ansprüche 2 bis 5, dadurch gekenn¬ zeichnet, daß die Stützplatte (50) einstückig mit der Abdeckplatte (52) verbunden ist.7. Feed unit according to one of claims 2 to 5, characterized gekenn¬ characterized in that the support plate (50) is integrally connected to the cover plate (52).
8. Förderaggregat nach einem der Ansprüche 1 bis 7, dadurch gekenn¬ zeichnet, daß der keramische Werkstoff ein teilstabilisiertes Zirkon-Dioxid ist. 8. Conveyor unit according to one of claims 1 to 7, characterized gekenn¬ characterized in that the ceramic material is a partially stabilized zirconium dioxide.
PCT/DE1992/000165 1991-03-09 1992-03-03 Fuel-feed unit for supplying fuel from a vehicle fuel tank to the engine WO1992015785A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9102825U DE9102825U1 (en) 1991-03-09 1991-03-09
DEG9102825.6U 1991-03-09

Publications (1)

Publication Number Publication Date
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Application Number Title Priority Date Filing Date
PCT/DE1992/000165 WO1992015785A1 (en) 1991-03-09 1992-03-03 Fuel-feed unit for supplying fuel from a vehicle fuel tank to the engine

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WO (1) WO1992015785A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664394A1 (en) * 1994-01-21 1995-07-26 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Fluid delivery device with a ceramic internal gear pump
WO1997021031A1 (en) * 1995-12-05 1997-06-12 Danfoss A/S Pump or motor
EP0816681A3 (en) * 1996-06-29 1998-07-15 LuK Fahrzeug-Hydraulik GmbH & Co. KG Vane pump
US6095771A (en) * 1995-12-30 2000-08-01 Robert Bosch Gmbh Fuel-feed unit
US6129176A (en) * 1996-08-15 2000-10-10 Suntec Industries, Inc. Sound attenuating motor end shield
US6423221B1 (en) * 1997-05-03 2002-07-23 Mannesmann Vdo Ag Pump assembly

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FR2589527A1 (en) * 1985-11-04 1987-05-07 Ngk Insulators Ltd SCREW PUMP
DE8700135U1 (en) * 1987-01-03 1988-05-05 Greiner, Peter
DE3638848A1 (en) * 1986-11-13 1988-05-19 Bosch Gmbh Robert Unit for the delivery of fuel from a tank to the internal combustion engine, especially of a motor vehicle

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DE2637980A1 (en) * 1976-08-24 1978-03-02 Bosch Gmbh Robert FUEL SUPPLY UNIT
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GB1340800A (en) * 1971-10-18 1973-12-12 Gen Motors Corp Electric fuel pump assemblies
FR2163935A5 (en) * 1971-12-07 1973-07-27 Rhone Poulenc Sa
GB2050513A (en) * 1979-05-18 1981-01-07 Bosch Gmbh Robert Rotary Positive-displacement Fluid-machines
FR2589527A1 (en) * 1985-11-04 1987-05-07 Ngk Insulators Ltd SCREW PUMP
DE3638848A1 (en) * 1986-11-13 1988-05-19 Bosch Gmbh Robert Unit for the delivery of fuel from a tank to the internal combustion engine, especially of a motor vehicle
DE8700135U1 (en) * 1987-01-03 1988-05-05 Greiner, Peter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664394A1 (en) * 1994-01-21 1995-07-26 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Fluid delivery device with a ceramic internal gear pump
US5618171A (en) * 1994-01-21 1997-04-08 Cerasiv Gmbh Innovatives-Keramik-Engineering Supply unit with a ceramic internal gear pump
WO1997021031A1 (en) * 1995-12-05 1997-06-12 Danfoss A/S Pump or motor
US6095771A (en) * 1995-12-30 2000-08-01 Robert Bosch Gmbh Fuel-feed unit
EP0816681A3 (en) * 1996-06-29 1998-07-15 LuK Fahrzeug-Hydraulik GmbH & Co. KG Vane pump
US6129176A (en) * 1996-08-15 2000-10-10 Suntec Industries, Inc. Sound attenuating motor end shield
US6423221B1 (en) * 1997-05-03 2002-07-23 Mannesmann Vdo Ag Pump assembly

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