EP0633981B1 - Oil pump for reciprocating piston engines - Google Patents

Oil pump for reciprocating piston engines Download PDF

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Publication number
EP0633981B1
EP0633981B1 EP94905728A EP94905728A EP0633981B1 EP 0633981 B1 EP0633981 B1 EP 0633981B1 EP 94905728 A EP94905728 A EP 94905728A EP 94905728 A EP94905728 A EP 94905728A EP 0633981 B1 EP0633981 B1 EP 0633981B1
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EP
European Patent Office
Prior art keywords
oil pump
piston
oil
eccentric rod
piston plate
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
EP94905728A
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German (de)
French (fr)
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EP0633981A1 (en
Inventor
Günter Kampichler
Erich Eder
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Motorenfabrik Hatz GmbH and Co KG
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Motorenfabrik Hatz GmbH and Co KG
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Publication of EP0633981A1 publication Critical patent/EP0633981A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • F04B23/023—Pumping installations or systems having reservoirs the pump being immersed in the reservoir only the pump-part being immersed, the driving-part being outside the reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston

Definitions

  • the invention relates to an oil pump for a reciprocating piston engine with at least one piston-cylinder arrangement, the piston of which drives the crankshaft via a connecting rod, the oil pump having an eccentric rod connected to the crankshaft, the free end of which carries a piston which is arranged with an oil , to the eccentric rod (1) open cylinder pot (2) cooperates in such a way that the pressure oil is supplied through an oil channel in the eccentric rod to one or more lubrication points.
  • Oil pumps for the transportation of lubricating oil to the bearings of the crankshaft and other components requiring lubrication or cooling in diesel engines or gasoline engines are known in numerous embodiments. They often have their own drive and pump units, which transport the oil as a continuous or intermittent stream in a circuit between the oil pan and the various lubrication points.
  • Known oil pumps are usually valve controlled, i.e. they contain many suction and pressure valves and are therefore also prone to wear.
  • a known pressure wave generator for cleaning in coolers uses a pump arranged in a cleaning liquid with a piston plate, which is used to generate shock-like Liquid movements are used.
  • a piston plate is sufficient for this, which engages with great play in a cylindrical pump housing and can be pivoted in accordance with the stroke of its eccentric drive.
  • the present invention has for its object to provide a simple oil pump for small engines, it should suffice to maintain the lubrication with an intermittent oil flow corresponding to the engine speed; the oil pump should in particular consist of as few simple components that are not susceptible to wear and should be able to be operated with low energy consumption.
  • the piston is formed by a piston plate which is mounted loosely and with axial play between axial stops at the cylinder-side end of the eccentric rod and, depending on the stroke direction, acts together with the stops as a suction or pressure valve .
  • Such an oil pump is driven by the crankshaft; Via the oil channel in the eccentric rod, it not only lubricates its plain bearing ring, but also enables the supply of further oil bores from there. Since the pump is arranged under oil, that is to say preferably in the oil pan, with the actual pump mechanism immersed in the lubricating oil, there is no need for complex sealing and valve means.
  • the bearing for the eccentric rod can be kept very narrow in the axial direction of the crankshaft, so that the space required for the pump drive is extremely small. The length of the eccentric rod depends on the distance of the crankshaft from the oil sump in the oil pan.
  • the eccentric rod due to its bearing on an eccentric shaft section of the crankshaft, also performs a laterally reciprocating movement, it is possible to use this lateral pivoting movement for the articulation of further lifting drives, e.g. to use as a drive for a diaphragm pump for the fuel supply.
  • the oil pump according to the invention can be used both for diesel engines and for gasoline engines; it is particularly suitable for small engines, especially single-cylinder engines.
  • a single-cylinder diesel engine with a pump piston diameter of approx. 36 mm an eccentricity of the bearing bore and thus a corresponding pump stroke of approx. 6 mm is sufficient.
  • its lateral swiveling is only a few degrees, usually less than 2 degrees.
  • the floating piston plate is advantageously mounted on a neck part projecting axially at the end of the eccentric rod remote from the crankshaft, which serves to axially guide the piston plate, in the two stop positions acting either as a suction or as a pressure valve.
  • the crankshaft-side stop is designed as an annular collar of the eccentric rod with a contact surface for the piston plate during the delivery stroke of the oil pump, and that on the other hand the stop remote from the crankshaft is formed by the head of a banjo bolt, which in the front end of the eccentric rod remote from the crankshaft is screwed in, such that the back of the head of the banjo bolt forms a bearing surface for the piston plate during the suction stroke of the oil pump.
  • the piston plate has through holes which are closed by the collar during the delivery stroke, so that the pressure oil reaches the oil channel via radial openings around the neck part and in the shaft of the banjo bolt and that the through holes during the suction stroke are open, the piston plate resting on the back of the head of the banjo bolt and thereby closing the radial openings leading to the oil channel in the neck part.
  • the radial openings in the neck part are expediently formed by slots in the end face thereof.
  • the piston plate can follow the small pivoting movements of the eccentric rod as freely as possible, it is provided that the piston plate has a spherical peripheral surface.
  • the wall of the cylinder pot could be provided with a spherical extension in the swivel area of the piston plate.
  • the piston plate is preferably made of sintered metal or Teflon, the cylinder bowl of the oil pump made of steel or aluminum. For the eccentric rod itself, production as an aluminum die-cast part is preferred.
  • the piston plate is divided parallel to the plane of the plate and the two plate parts together form an outwardly open circumferential groove in which a sealing ring is loose and with a radial Game is inserted, which rests with its peripheral surface sealingly on the inner wall of the cylinder pot.
  • a peripheral peripheral portion of the piston plate is formed by an annular lip made of elastomeric material;
  • the Shore hardness of the annular lip so that it opens at a certain pressure, that is to say acts as a pressure relief valve if, for example, an undesirably high pressure builds up in the system as a result of a blocked lubricating oil pressure line. This prevents damage to the bearing points or pressure lines in a simple and effective manner.
  • the latter has a corresponding internal thread, so that the appropriately steel banjo bolt, the head of which closes the eccentric rod on the front side and the back of which also forms a stop for the piston plate, can be screwed in until the head is open sits at the front end of the neck part.
  • the transport routes for the lubricating oil are designed in a particularly simple manner such that the bearing bore in the slide bearing ring of the eccentric rod has an annular groove which serves for bearing lubrication and is connected to the connecting rod bearing of the crankshaft via an oil bore.
  • a spray nozzle for cooling the piston crown of the piston of the reciprocating piston engine can be connected to the annular groove.
  • 1 to 3 consists essentially of an eccentric rod 1, a cylinder cup 2, a piston plate 3 and a hollow screw 4 which is screwed into a corresponding internal thread of the eccentric rod 1 at the end of the eccentric rod 1 remote from the crankshaft, the internal thread being the assigned mouth of an oil channel 5 forms inside the eccentric rod 1.
  • the hollow screw 4 thus continues to a certain extent the oil channel 5; it is connected via radial openings 6 in its shaft 7 to an annular space 8 between the shaft 7 and a neck part 9 which surrounds it at a distance and forms the front end of the eccentric rod 1.
  • the head 10 of the hollow screw 4 forms with its rear side the stop remote from the crankshaft for the piston plate 3 floating between two stops; the crankshaft side stop is formed by an annular Collar 11 of the eccentric rod 1, on which an end face 12 for the piston plate 3 is formed radially outside the neck part 9.
  • the piston plate 3 sits with a play of approximately 0.5 mm between the crankshaft-side contact surface 12 and an annular contact surface 13 formed by the rear of the head 10 of the banjo bolt 4.
  • the eccentric rod 1 has at its end on the crankshaft side a plain bearing ring 14 with a bearing bore 15; the bearing bore 15 serves as a bearing seat, matching a corresponding shaft section on the crankshaft (not shown).
  • the eccentric rod 1 is driven in accordance with the eccentricity of the shaft section in the sense of a reciprocating piston, so that the eccentric rod performs a lifting movement on the one hand and a lateral pivoting movement on the other hand.
  • the stroke movement is used as part of the pump function for the suction stroke on the one hand and the delivery stroke on the other.
  • FIG. 1 shows the eccentric rod in its extreme inclined position, the angular deflection (to the right) is approximately 1.5 degrees.
  • 2 and 3 show the eccentric rod in its upper and lower dead center, ie FIG. 2 shows the final phase of the suction stroke and FIG. 3 the final phase of the conveying stroke.
  • the piston plate 3 rests on the contact surface 13 of the head 10 of the hollow screw 4; accordingly, lubricating oil, through which the cylinder cup 2 is covered, passes through the gap between the top of the piston plate 3 and the opposite contact surface 12 of the Collar 11 and through holes 17 in the piston plate 3 in the cylinder chamber 18 of the oil pump.
  • the piston plate 3 floats by sealingly resting against the contact surface 12 of the collar 11, while the eccentric rod 1 moves against the bottom 19 of the cylinder pot; the oil present in the cylinder chamber 18 flows during the delivery stroke shown in FIG.
  • the cylinder pot 2 is screwed with an external thread 23 from the outside into a corresponding threaded hole in the oil pan 24 (FIG. 2) against a sealing ring 25 lying on the outside of the oil pan 24 and covered by the oil sump 26.
  • the piston plate 3 is divided in a plane perpendicular to the axis of the eccentric rod 1 into two plate parts 3a, 3b, which together form a circumferential groove 30 open to the outside; in the circumferential groove 30, a sealing ring 31 is received with radial play, so that it is able to close the gap between the piston plate 3 and the inner wall of the cylinder pot 2 for each pivoting position Seal eccentric rod 5.
  • Both plate parts 3a, 3b together form through bores 17, as already described in connection with the exemplary embodiment according to FIGS. 1 to 5.
  • the same components corresponding to this embodiment are provided with the same reference numerals in FIG. 6 and in FIGS. 7 and 8.
  • the one-piece piston plate 3 has a peripheral circumferential groove 30 which is open in the radial direction and in which a sealing ring in the manner of a piston ring 32 is inserted.
  • a piston ring 32 ensures that the seal between the piston plate 3 and the cylinder cup 2 is maintained even when the piston plate 3 carries out a swiveling movement that corresponds to the eccentric movement of the eccentric rod 1.
  • FIG. 8 shows a piston plate 3 with a groove-shaped seat in its peripheral area; an annular lip 33 made of elastomeric material is fastened in the seat by vulcanization.
  • the annular lip 33 is shown with a slight deformation upwards in order to make it clear that it is able to yield to an undesirably high pressure in the cylinder space in the manner of a pressure relief valve.
  • Such high pressures can arise when there are occlusions of lubricating oil pressure lines which are connected to the oil channel 5.
  • the overpressure function of the annular lip 33 prevents damage in the region of the pressure lines or bearing locations supplied by them.
  • the oil pump described consists of a few components; in a particularly simple embodiment (FIGS. 1-5), it even dispenses with the use of seals which are susceptible to wear between the piston plate and the cylinder pot; little space is required in the axial direction of the crankshaft for the narrow eccentric rod.
  • the oil pump By driving according to the crankshaft speed, the oil pump generates an intermittent oil flow in the sense of a single-acting piston pump, the flow rate of which can be adapted to the respective requirements by appropriate dimensioning of the oil pump.
  • the delivery rate for an inner diameter of the cylinder bowl 2 of 36 mm is just under two liters / minute at a speed of 3,000 revolutions / minute.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Compressor (AREA)

Abstract

An easy-to-produce oil pump for small motors has an eccentric rod (1) coupled to the crankshaft. The free end of the eccentric rod (1) carries a piston plate (3) which cooperates with a cylinder pot (2) submerged in the oil and open towards the eccentric rod (1), so that the pressurized oil is supplied through an oil channel (5) arranged in the eccentric rod (1) to one or several lubrication spots. The piston plate tolerates the oscillation of the eccentric rod (1).

Description

Die Erfindung betrifft eine Ölpumpe für einen Hubkolbenmotor mit wenigstens einer Kolben-Zylinder-Anordnung, deren Kolben über ein Pleuel die Kurbelwelle antreibt, wobei die Ölpumpe eine an die Kurbelwelle angeschlossene Exzenterstange aufweist, deren freies Ende einen Kolben trägt, der mit einem unter Öl angeordneten, zur Exzenterstange (1) hin offenen Zylindertopf (2) zusammenwirkt, derart, daß das Drucköl durch einen Ölkanal in der Exzenterstange einer oder mehreren Schmierstellen zugeführt wird.The invention relates to an oil pump for a reciprocating piston engine with at least one piston-cylinder arrangement, the piston of which drives the crankshaft via a connecting rod, the oil pump having an eccentric rod connected to the crankshaft, the free end of which carries a piston which is arranged with an oil , to the eccentric rod (1) open cylinder pot (2) cooperates in such a way that the pressure oil is supplied through an oil channel in the eccentric rod to one or more lubrication points.

Ölpumpen für den Schmieröltransport zu den Lagerstellen der Kurbelwelle und weiteren der Schmierung bzw. Kühlung bedürftigen Bauelementen bei Dieselmotoren oder Benzinmotoren sind in zahlreichen Ausführungsformen bekannt. Vielfach besitzen sie eigene Antriebs- und Pumpenaggregate, welche das Öl als kontinuierlichen oder intermittierenden Strom in einem Kreislauf zwischen Ölwanne und den verschiedenen Schmierstellen transportieren. Bekannte Ölpumpen sind üblicherweise ventilgesteuert, d.h. sie enthalten viele Saug- und Druckventile und sind damit auch verschleißanfällig.Oil pumps for the transportation of lubricating oil to the bearings of the crankshaft and other components requiring lubrication or cooling in diesel engines or gasoline engines are known in numerous embodiments. They often have their own drive and pump units, which transport the oil as a continuous or intermittent stream in a circuit between the oil pan and the various lubrication points. Known oil pumps are usually valve controlled, i.e. they contain many suction and pressure valves and are therefore also prone to wear.

Eine Ölpumpe der eingangs erläuterten Gattung ist in der deutschen Gebrauchsmusterschrift 1758836 beschrieben. Bei dieser verhältnismäßig aufwendig gebauten Schmierölpumpe ist das Pumpengehäuse schwenkbar auf einer ölführenden Hohlwelle gelagert, so daß es die Schwenkbewegungen des zylindrischen Pumpenkolbens mitmachen kann.An oil pump of the type described in the introduction is described in German utility model 1758836. In this relatively complex lubricating oil pump, the pump housing is pivotally mounted on an oil-carrying hollow shaft, so that it can participate in the pivoting movements of the cylindrical pump piston.

Darüberhinaus kommt bei einem bekannten Druckwellenerzeuger zur Reinigung in Kühlern (US-A-4627798) eine in einer Reinigungsflüssigkeit angeordnete Pumpe mit Kolbenplatte zum Einsatz, welche zum Erzeugen stoßartiger Flüssigkeitsbewegungen dient. Hierzu genügt eine Kolbenplatte, welche mit großem Spiel in ein zylindrisches Pumpengehäuse eingreift und dabei entsprechend dem Hub ihres Exzenterantriebs schwenkbar ist.In addition, a known pressure wave generator for cleaning in coolers (US-A-4627798) uses a pump arranged in a cleaning liquid with a piston plate, which is used to generate shock-like Liquid movements are used. A piston plate is sufficient for this, which engages with great play in a cylindrical pump housing and can be pivoted in accordance with the stroke of its eccentric drive.

Demgegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine einfache Ölpumpe für Kleinmotoren zu schaffen, wobei es genügen soll, die Schmierung mit einem der Motordrehzahl entsprechend intermittierenden Ölstrom aufrecht zu erhalten; die Ölpumpe soll insbesondere aus möglichst wenigen, nicht verschleißanfälligen, einfachen Bauteilen bestehen und mit geringem Energieaufwand betrieben werden können.In contrast, the present invention has for its object to provide a simple oil pump for small engines, it should suffice to maintain the lubrication with an intermittent oil flow corresponding to the engine speed; the oil pump should in particular consist of as few simple components that are not susceptible to wear and should be able to be operated with low energy consumption.

Diese Aufgabe wird nach dem Erfindungskonzept in der Weise gelöst, daß der Kolben durch eine Kolbenplatte gebildet ist, die lose und mit axialem Spiel zwischen axialen Anschlägen am zylinderseitigen Ende der Exzenterstange gelagert ist und je nach Hubrichtung zusammen mit den Anschlägen als Saug- oder Druckventil wirkt.This object is achieved according to the concept of the invention in such a way that the piston is formed by a piston plate which is mounted loosely and with axial play between axial stops at the cylinder-side end of the eccentric rod and, depending on the stroke direction, acts together with the stops as a suction or pressure valve .

Dadurch, daß statt eines zylindrischen Kolbens eine Kolbenplatte vorgesehen ist, erübrigt sich eine aufwendige Schwenklagerung für den Zylindertopf. Die Schwenkbewegung der Exzenterstange wird durch die erfindungsgemäße Kolbenplatte ausgeglichen. Dieser Ausgleich wird noch unterstützt durch die zwischen Anschlägen axial schwimmende Lagerung der Kolbenplatte sowie durch weitere, in den Ansprüchen 9 bis 13 enthaltene Ausgestaltungen der Kolbenplatte im Bereich ihrer peripheren Umfangsfläche.Because a piston plate is provided instead of a cylindrical piston, there is no need for a complex pivot bearing for the cylinder pot. The pivoting movement of the eccentric rod is compensated for by the piston plate according to the invention. This compensation is further supported by the axially floating mounting of the piston plate between stops and by further configurations of the piston plate in the area of their peripheral peripheral surface.

Eine derartig ausgestaltete Ölpumpe wird von der Kurbelwelle mit angetrieben; über den Ölkanal in der Exzenterstange schmiert sie nicht nur deren Gleitlagerring, sondern ermöglicht von dieser aus auch die Versorgung weiterer Ölbohrungen. Da die Pumpe unter Öl, also bevorzugt in der Ölwanne, dort mit dem eigentlichen Pumpenmechanismus in das Schmieröl eingetaucht angeordnet ist, erübrigen sich aufwendige Dichtungs- und Ventilmittel. Das Lager für die Exzenterstange kann in axialer Richtung der Kurbelwelle sehr schmal gehalten werden, so daß der Platzbedarf für den Pumpenantrieb äußerst gering ist. Die Länge der Exzenterstange richtet sich nach der Entfernung der Kurbelwelle vom Ölsumpf in der Ölwanne. Weil die Exzenterstange infolge ihrer Lagerung auf einem exzentrischen Wellenabschnitt der Kurbelwelle auch eine seitlich hin- und hergehende Bewegung ausführt, besteht die Möglichkeit, diese seitliche Schwenkbewegung für die Anlenkung weiterer Hubantriebe, z.B. als Antrieb für eine Membranpumpe für den Kraftstoffzulauf zu nutzen.Such an oil pump is driven by the crankshaft; Via the oil channel in the eccentric rod, it not only lubricates its plain bearing ring, but also enables the supply of further oil bores from there. Since the pump is arranged under oil, that is to say preferably in the oil pan, with the actual pump mechanism immersed in the lubricating oil, there is no need for complex sealing and valve means. The bearing for the eccentric rod can be kept very narrow in the axial direction of the crankshaft, so that the space required for the pump drive is extremely small. The length of the eccentric rod depends on the distance of the crankshaft from the oil sump in the oil pan. Because the eccentric rod, due to its bearing on an eccentric shaft section of the crankshaft, also performs a laterally reciprocating movement, it is possible to use this lateral pivoting movement for the articulation of further lifting drives, e.g. to use as a drive for a diaphragm pump for the fuel supply.

Selbstverständlich kann die erfindungsgemäße Ölpumpe sowohl für Dieselmotoren als auch für Ottomotoren eingesetzt werden; sie eignet sich besonders für Kleinmotoren, insbesondere Einzylindermotoren. Dabei genügt für einen Einzylinder-Dieselmotor bei einem Pumpenkolbendurchmesser von ca. 36 mm eine Exzentrizität der Lagerbohrung und damit ein dementsprechender Pumpenhub von etwa 6 mm. Je nach Länge der Exzenterstange beträgt dabei deren seitliche Ausschwenkung nur wenige Winkelgrade, in der Regel weniger als 2 Grad.Of course, the oil pump according to the invention can be used both for diesel engines and for gasoline engines; it is particularly suitable for small engines, especially single-cylinder engines. For a single-cylinder diesel engine with a pump piston diameter of approx. 36 mm, an eccentricity of the bearing bore and thus a corresponding pump stroke of approx. 6 mm is sufficient. Depending on the length of the eccentric rod, its lateral swiveling is only a few degrees, usually less than 2 degrees.

Die schwimmend gelagerte Kolbenplatte ist vorteilhaft auf einem am kurbelwellenfernen Ende der Exzenterstange axial vorspringenden Halsteil gelagert, welcher der axialen Führung der Kolbenplatte dient, wobei sie in den beiden Anschlagsstellungen entweder als Saug- oder als Druckventil wirkt. Zu diesem Zweck ist in weiterer Ausgestaltung der Erfindung vorgesehen, daß der kurbelwellenseitige Anschlag als ringförmiger Kragen der Exzenterstange mit einer Anlagefläche für die Kolbenplatte während des Förderhubs der Ölpumpe ausgebildet ist, und daß andererseits der kurbelwellenferne Anschlag durch den Kopf einer Hohlschraube gebildet ist, die in das kurbelwellenferne Stirnende der Exzenterstange eingeschraubt ist, derart, daß die Rückseite des Kopfs der Hohlschraube eine Auflagefläche für die Kolbenplatte während des Saughubs der Ölpumpe bildet.The floating piston plate is advantageously mounted on a neck part projecting axially at the end of the eccentric rod remote from the crankshaft, which serves to axially guide the piston plate, in the two stop positions acting either as a suction or as a pressure valve. For this purpose, it is provided in a further embodiment of the invention that the crankshaft-side stop is designed as an annular collar of the eccentric rod with a contact surface for the piston plate during the delivery stroke of the oil pump, and that on the other hand the stop remote from the crankshaft is formed by the head of a banjo bolt, which in the front end of the eccentric rod remote from the crankshaft is screwed in, such that the back of the head of the banjo bolt forms a bearing surface for the piston plate during the suction stroke of the oil pump.

Zur Verwirklichung der Ventilfunktion der Kolbenplatte ist vorgesehen, daß die Kolbenplatte Durchgangsbohrungen aufweist, die während des Förderhubs durch den Kragen verschlossen sind, so daß das Drucköl über radiale Öffnungen um Halsteil und im Schaft der Hohlschraube in den Ölkanal gelangt und daß die Durchgangsbohrungen während des Saughubs offen sind, wobei die Kolbenplatte auf der Rückseite des Kopfs der Hohlschraube aufliegt und dadurch die zum Ölkanal führenden radialen Öffnungen im Halsteil verschließt.To achieve the valve function of the piston plate, it is provided that the piston plate has through holes which are closed by the collar during the delivery stroke, so that the pressure oil reaches the oil channel via radial openings around the neck part and in the shaft of the banjo bolt and that the through holes during the suction stroke are open, the piston plate resting on the back of the head of the banjo bolt and thereby closing the radial openings leading to the oil channel in the neck part.

Zweckmäßigerweise sind die radialen Öffnungen im Halsteil durch Schlitze in dessen Stirnfläche gebildet.The radial openings in the neck part are expediently formed by slots in the end face thereof.

Damit die Kolbenplatte den geringen Schwenkbewegungen der Exzenterstange möglichst zwanglos folgen kann, ist vorgesehen, daß die Kolbenplatte eine ballige Umfangsfläche besitzt. Zusätzlich könnte die Wand des Zylindertopfs mit einer kugeligen Erweiterung im Schwenkbereich der Kolbenplatte versehen sein. Die Kolbenplatte besteht bevorzugt aus Sintermetall oder Teflon, der Zylindertopf der Ölpumpe aus Stahl oder Aluminium. Für die Exzenterstange selbst kommt eine Herstellung als Aluminiumdruckgußteil bevorzugt in Frage.So that the piston plate can follow the small pivoting movements of the eccentric rod as freely as possible, it is provided that the piston plate has a spherical peripheral surface. In addition, the wall of the cylinder pot could be provided with a spherical extension in the swivel area of the piston plate. The piston plate is preferably made of sintered metal or Teflon, the cylinder bowl of the oil pump made of steel or aluminum. For the eccentric rod itself, production as an aluminum die-cast part is preferred.

Zum Ausgleich des Längs- und Querversatzes zwischen Zylinderkopf und Exzenterstange infolge ihrer exzentrischen Bewegung kann es vorteilhaft sein, daß die Kolbenplatte parallel zur Plattenebene geteilt ist und die beiden Plattenteile zusammen eine nach außen offene Umfangsnut bilden, in welche ein Dichtungsring lose und mit radialem Spiel eingelegt ist, der mit seiner Umfangsfläche dichtend an der Innenwand des Zylindertopfs anliegt.To compensate for the longitudinal and transverse offset between the cylinder head and eccentric rod due to their eccentric movement, it can be advantageous that the piston plate is divided parallel to the plane of the plate and the two plate parts together form an outwardly open circumferential groove in which a sealing ring is loose and with a radial Game is inserted, which rests with its peripheral surface sealingly on the inner wall of the cylinder pot.

Nach einer weiteren Variante kann es zum Zwecke des Versatzausgleichs zweckmäßig sein, in einer Umfangsnut der Kolbenplatte eine Dichtung in Art eines Kolbenrings vorzusehen.According to a further variant, it may be expedient for the purpose of offset compensation to provide a seal in the manner of a piston ring in a circumferential groove of the piston plate.

Schließlich kann es vorteilhaft sein, daß ein peripherer Umfangsabschnitt der Kolbenplatte durch eine Ringlippe aus elastomerem Werkstoff gebildet ist; bei dieser Ausführungsform besteht die Möglichkeit, die Shore-Härte der Ringlippe so zu wählen, daß sie bei einem bestimmten Druck öffnet, also wie ein Überdruckventil wirkt, wenn sich beispielsweise infolge einer verstopften Schmieröldruckleitung ein unerwünscht hoher Druck im System aufbaut. Dadurch werden auf einfache und wirksame Weise Beschädigungen der Lagerstellen oder Druckleitungen vermieden.Finally, it may be advantageous that a peripheral peripheral portion of the piston plate is formed by an annular lip made of elastomeric material; In this embodiment, it is possible to choose the Shore hardness of the annular lip so that it opens at a certain pressure, that is to say acts as a pressure relief valve if, for example, an undesirably high pressure builds up in the system as a result of a blocked lubricating oil pressure line. This prevents damage to the bearing points or pressure lines in a simple and effective manner.

Für die Befestigung der Hohlschraube am stirnseitigen Ende der Exzenterstange besitzt letztere ein entsprechendes Innengewinde, so daß die zweckmäßig aus Stahl bestehende Hohlschraube, deren Kopf die Exzenterstange stirnseitig verschließt und dessen Rückseite außerdem einen Anschlag für die Kolbenplatte bildet, eingeschraubt werden kann, bis der Kopf auf dem stirnseitigen Ende des Halsteils aufsitzt.For the fastening of the banjo bolt at the front end of the eccentric rod, the latter has a corresponding internal thread, so that the appropriately steel banjo bolt, the head of which closes the eccentric rod on the front side and the back of which also forms a stop for the piston plate, can be screwed in until the head is open sits at the front end of the neck part.

Die Transportwege für das Schmieröl sind in besonders einfacher Weise derart ausgestaltet, daß die Lagerbohrung im Gleitlagerring der Exzenterstange eine Ringnut aufweist, die der Lagerschmierung dient und über eine Ölbohrung mit dem Pleuellager der Kurbelwelle verbunden ist. Überdies kann an die Ringnut eine Spritzdüse für die Kühlung des Kolbenbodens des Kolbens des Hubkolbenmotors angeschlossen sein.The transport routes for the lubricating oil are designed in a particularly simple manner such that the bearing bore in the slide bearing ring of the eccentric rod has an annular groove which serves for bearing lubrication and is connected to the connecting rod bearing of the crankshaft via an oil bore. In addition, a spray nozzle for cooling the piston crown of the piston of the reciprocating piston engine can be connected to the annular groove.

Im folgenden wird ein Ausführungsbeispiel einer erfindungsgemäßen Ölpumpe für einen Einzylinder-Dieselmotor näher erläutert. Es zeigt

Fig. 1
einen Längsschnitt durch die Kolbenpumpe in einer Ebene senkrecht zur Achse der Lagerbohrung in der Exzenterstange,
Fig. 2
einen Längsschnitt durch die Ölpumpe in einer Ebene parallel zur Achse der Lagerbohrung der Exzenterstange im oberen Umkehrpunkt der Exzenterstange,
Fig. 3
einen Schnitt gemäß Fig. 2 im unteren Umkehrpunkt der Exzenterstange,
Fig. 4
eine Einzelheit X gemäß Fig. 2,
Fig. 5
eine Einzelheit Y gemäß Fig. 3,
Fig. 6, 7 und 8
jeweils eine andere Ausführungsform der Kolbenplatte im Axialschnitt.
An exemplary embodiment of an oil pump according to the invention for a single-cylinder diesel engine is explained in more detail below. It shows
Fig. 1
a longitudinal section through the piston pump in a plane perpendicular to the axis of the bearing bore in the eccentric rod,
Fig. 2
a longitudinal section through the oil pump in a plane parallel to the axis of the bearing bore of the eccentric rod in the upper reversal point of the eccentric rod,
Fig. 3
2 in the lower reversal point of the eccentric rod,
Fig. 4
a detail X according to FIG. 2,
Fig. 5
a detail Y according to FIG. 3,
6, 7 and 8
each have a different embodiment of the piston plate in axial section.

Die Ölpumpe gemäß den Fig. 1 bis 3 besteht im wesentlichen aus einer Exzenterstange 1, einem Zylindertopf 2, einer Kolbenplatte 3 und einer Hohlschraube 4, welche am kurbelwellenfernen Ende der Exzenterstange 1 in ein entsprechendes Innengewinde der Exzenterstange 1 eingeschraubt ist, wobei das Innengewinde die zugeordnete Mündung eines Ölkanals 5 im Inneren der Exzenterstange 1 bildet. Die Hohlschraube 4 setzt somit gewissermaßen den Ölkanal 5 fort; sie ist über radiale Öffnungen 6 in ihrem Schaft 7 mit einem Ringraum 8 zwischen dem Schaft 7 und einem diesen mit Abstand umgebenden Halsteil 9, der das stirnseitige Ende der Exzenterstange 1 bildet, verbunden. Der Kopf 10 der Hohlschraube 4 bildet mit seiner Rückseite den kurbelwellenfernen Anschlag für die zwischen zwei Anschlägen schwimmend angeordnete Kolbenplatte 3; der kurbelwellenseitige Anschlag ist gebildet durch einen ringförmigen Kragen 11 der Exzenterstange 1, an welchem radial außerhalb des Halsteils 9 eine stirnseitige Anlagefläche 12 für die Kolbenplatte 3 ausgebildet ist. Die Kolbenplatte 3 sitzt mit einem Spiel von etwa 0,5 mm zwischen der kurbelwellenseitigen Anlagefläche 12 und einer durch die Rückseite des Kopfs 10 der Hohlschraube 4 gebildeten ringförmigen Auflagefläche 13. In den Fig. 4 und 5 sind die vorstehend erläuterten Bauteile vergrößert dargestellt.1 to 3 consists essentially of an eccentric rod 1, a cylinder cup 2, a piston plate 3 and a hollow screw 4 which is screwed into a corresponding internal thread of the eccentric rod 1 at the end of the eccentric rod 1 remote from the crankshaft, the internal thread being the assigned mouth of an oil channel 5 forms inside the eccentric rod 1. The hollow screw 4 thus continues to a certain extent the oil channel 5; it is connected via radial openings 6 in its shaft 7 to an annular space 8 between the shaft 7 and a neck part 9 which surrounds it at a distance and forms the front end of the eccentric rod 1. The head 10 of the hollow screw 4 forms with its rear side the stop remote from the crankshaft for the piston plate 3 floating between two stops; the crankshaft side stop is formed by an annular Collar 11 of the eccentric rod 1, on which an end face 12 for the piston plate 3 is formed radially outside the neck part 9. The piston plate 3 sits with a play of approximately 0.5 mm between the crankshaft-side contact surface 12 and an annular contact surface 13 formed by the rear of the head 10 of the banjo bolt 4. The components explained above are shown enlarged in FIGS. 4 and 5.

Die Exzenterstange 1 besitzt an ihrem kurbelwellenseitigen Ende einen Gleitlagerring 14 mit einer Lagerbohrung 15; die Lagerbohrung 15 dient als Lagersitz, passend zu einem entsprechenden Wellenabschnitt auf der (nicht gezeigten) Kurbelwelle. Infolge der Drehung der Kurbelwelle mit dem als exzentrischen Lagersitz ausgebildeten Wellenabschnitt, auf welchem der Gleitlagerring 14 der Exzenterstange 1 läuft, wird letztere entsprechend der Exzentrizität des Wellenabschnitts im Sinne eines Hubkolbens angetrieben, so daß die Exzenterstange einerseits eine Hubbewegung und andererseits eine seitliche Schwenkbewegung ausführt. Die Hubbewegung wird genutzt im Rahmen der Pumpenfunktion für den Saughub einerseits und den Förderhub andererseits. Um eine einwandfreie Führung der Kolbenplatte 3 im Inneren des Zylindertopfs 2 zu gewährleisten, kann die Umfangsfläche 16 der Kolbenplatte 3 ballig ausgeführt sein. Fig. 1 zeigt die Exzenterstange in ihrer extremen Schrägstellung, wobei der Winkelausschlag (nach rechts) etwa 1,5 Winkelgrade beträgt. Die Fig. 2 und 3 zeigen die Exzenterstange in ihrem oberen bzw. unteren Totpunkt, d.h. Fig. 2 zeigt die Endphase des Saughubs und Fig.3 die Endphase des Förderhubs. Während des Saughubs liegt die Kolbenplatte 3 auf der Anlagefläche 13 des Kopfs 10 der Hohlschraube 4 auf; dementsprechend gelangt Schmieröl, durch welches der Zylindertopf 2 bedeckt ist, durch den Spalt zwischen der Oberseite der Kolbenplatte 3 und der gegenüberliegenden Anlagefläche 12 des Kragens 11 sowie Durchgangsbohrungen 17 in der Kolbenplatte 3 in den Zylinderraum 18 der Ölpumpe. Während des nachfolgenden Förderhubs schwimmt die Kolbenplatte 3 auf, indem sie sich dichtend gegen die Anlagefläche 12 des Kragens 11 anlegt, während sich die Exzenterstange 1 gegen den Boden 19 des Zylindertopfs bewegt; das im Zylinderraum 18 vorhandene Öl strömt während des in Fig. 3 dargestellten Förderhubs aus dem Zylinderraum 18 durch den Spalt zwischen der Auflagefläche 13 des Kopfs 10 der Hohlschraube 4 und der zugeordneten Stirnfläche der Kolbenplatte 3 und weiter durch Schlitze 20 im Stirnende des Halsteils 9 in den Ringraum 8 zwischen dem Halsteil 9 und dem Schaft 7 der Hohlschraube 4; von dort gelangt das Drucköl über die radialen Öffnungen 6 in das Innere der Hohlschraube 4 und von dort über den Ölkanal 5 zur Lagerstelle des Gleitlagerrings 14 der Exzenterstange 1. In die Lauffläche 21 der Lagerbohrung 15 des Gleitlagerrings 14 der Exzenterstange 1 ist eine Ringnut 22 für die Lagerschmierung eingearbeitet. Diese Ringnut ist über eine (nicht gezeigte) Ölbohrung mit dem Pleuellager der Kurbelwelle verbunden. An diese Ringnut 22 kann ferner eine Spritzdüse 27 für die Kühlung des Kolbenboden 9 des Hubkolbens angeschlossen sein.The eccentric rod 1 has at its end on the crankshaft side a plain bearing ring 14 with a bearing bore 15; the bearing bore 15 serves as a bearing seat, matching a corresponding shaft section on the crankshaft (not shown). As a result of the rotation of the crankshaft with the shaft section designed as an eccentric bearing seat, on which the slide bearing ring 14 of the eccentric rod 1 runs, the eccentric rod 1 is driven in accordance with the eccentricity of the shaft section in the sense of a reciprocating piston, so that the eccentric rod performs a lifting movement on the one hand and a lateral pivoting movement on the other hand. The stroke movement is used as part of the pump function for the suction stroke on the one hand and the delivery stroke on the other. In order to ensure proper guidance of the piston plate 3 inside the cylinder pot 2, the peripheral surface 16 of the piston plate 3 can be spherical. Fig. 1 shows the eccentric rod in its extreme inclined position, the angular deflection (to the right) is approximately 1.5 degrees. 2 and 3 show the eccentric rod in its upper and lower dead center, ie FIG. 2 shows the final phase of the suction stroke and FIG. 3 the final phase of the conveying stroke. During the suction stroke, the piston plate 3 rests on the contact surface 13 of the head 10 of the hollow screw 4; accordingly, lubricating oil, through which the cylinder cup 2 is covered, passes through the gap between the top of the piston plate 3 and the opposite contact surface 12 of the Collar 11 and through holes 17 in the piston plate 3 in the cylinder chamber 18 of the oil pump. During the subsequent conveying stroke, the piston plate 3 floats by sealingly resting against the contact surface 12 of the collar 11, while the eccentric rod 1 moves against the bottom 19 of the cylinder pot; the oil present in the cylinder chamber 18 flows during the delivery stroke shown in FIG. 3 from the cylinder chamber 18 through the gap between the bearing surface 13 of the head 10 of the hollow screw 4 and the associated end face of the piston plate 3 and further through slots 20 in the front end of the neck part 9 in the annular space 8 between the neck part 9 and the shaft 7 of the hollow screw 4; from there the pressure oil passes through the radial openings 6 into the interior of the banjo bolt 4 and from there via the oil channel 5 to the bearing point of the slide bearing ring 14 of the eccentric rod 1. In the running surface 21 of the bearing bore 15 of the slide bearing ring 14 of the eccentric rod 1 there is an annular groove 22 for the bearing lubrication incorporated. This annular groove is connected to the connecting rod bearing of the crankshaft via an oil hole (not shown). A spray nozzle 27 for cooling the piston crown 9 of the reciprocating piston can also be connected to this annular groove 22.

Der Zylindertopf 2 ist mit einem Außengewinde 23 von außen in eine entsprechende Gewindebohrung der Ölwanne 24 (Fig. 2) gegen einen an der Außenseite der Ölwanne 24 anliegenden Dichtungsring 25 eingeschraubt und vom Ölsumpf 26 bedeckt.The cylinder pot 2 is screwed with an external thread 23 from the outside into a corresponding threaded hole in the oil pan 24 (FIG. 2) against a sealing ring 25 lying on the outside of the oil pan 24 and covered by the oil sump 26.

Gemäß Fig. 6 ist die Kolbenplatte 3 in einer Ebene senkrecht zur Achse der Exzenterstange 1 in zwei Plattenteile 3a, 3b geteilt, welche zusammen eine nach außen offene Umfangsnut 30 bilden; in der Umfangsnut 30 ist ein Dichtungsring 31 mit radialem Spiel aufgenommen, so daß er in der Lage ist, den Spalt zwischen Kolbenplatte 3 und der Innenwand des Zylindertopfs 2 für jede Schwenklage der Exzenterstange 5 abzudichten. Beide Plattenteile 3a, 3b bilden zusammen Durchgangsbohrungen 17, wie bereits im Zusammenhang mit dem Ausführungsbeispiel gemäß den Fig. 1 bis 5 beschrieben. Die diesem Ausführungsbeispiel entsprechenden gleichen Bauteile sind in Fig. 6 sowie in den Fig. 7 und 8 jeweils mit denselben Bezugszeichen versehen.6, the piston plate 3 is divided in a plane perpendicular to the axis of the eccentric rod 1 into two plate parts 3a, 3b, which together form a circumferential groove 30 open to the outside; in the circumferential groove 30, a sealing ring 31 is received with radial play, so that it is able to close the gap between the piston plate 3 and the inner wall of the cylinder pot 2 for each pivoting position Seal eccentric rod 5. Both plate parts 3a, 3b together form through bores 17, as already described in connection with the exemplary embodiment according to FIGS. 1 to 5. The same components corresponding to this embodiment are provided with the same reference numerals in FIG. 6 and in FIGS. 7 and 8.

Gemäß Fig. 7 besitzt die einteilige Kolbenplatte 3 eine periphere Umfangsnut 30, welche in radialer Richtung offen ist und in welche ein Dichtungsring in Art eines Kolbenrings 32 eingesetzt ist. Ein derartiger Kolbenring 32 sichert die Aufrechterhaltung der Dichtung zwischen Kolbenplatte 3 und Zylindertopf 2 auch dann, wenn die Kolbenplatte 3 eine entsprechend der Exzenterbewegung der Exzenterstange 1 ablaufende Schwenkbewegung durchführt.7, the one-piece piston plate 3 has a peripheral circumferential groove 30 which is open in the radial direction and in which a sealing ring in the manner of a piston ring 32 is inserted. Such a piston ring 32 ensures that the seal between the piston plate 3 and the cylinder cup 2 is maintained even when the piston plate 3 carries out a swiveling movement that corresponds to the eccentric movement of the eccentric rod 1.

Schließlich zeigt Fig. 8 eine Kolbenplatte 3 mit einer nutförmigen Sitzfläche in ihrem Umfangsbereich; in der Sitzfläche ist eine Ringlippe 33 aus elastomerem Werkstoff durch Vulkanisieren befestigt. Auf der rechten Seite ist die Ringlippe 33 mit einer leichten Verformung nach oben dargestellt, um anschaulich zu machen, daß sie in der Lage ist, einem unerwünscht hohen Druck im Zylinderraum in Art eines Überdruckventils nachzugeben. Derartig hohe Drücke können dann entstehen, wenn es zu Verschlüssen von Schmieröldruckleitungen kommt, die an den Ölkanal 5 angeschlossen sind. In diesem Fall verhindert die Überdruckfunktion der Ringlippe 33, daß es zu Beschädigungen im Bereich der Druckleitungen oder von diesen versorgten Lagerstellen kommt.Finally, FIG. 8 shows a piston plate 3 with a groove-shaped seat in its peripheral area; an annular lip 33 made of elastomeric material is fastened in the seat by vulcanization. On the right side, the annular lip 33 is shown with a slight deformation upwards in order to make it clear that it is able to yield to an undesirably high pressure in the cylinder space in the manner of a pressure relief valve. Such high pressures can arise when there are occlusions of lubricating oil pressure lines which are connected to the oil channel 5. In this case, the overpressure function of the annular lip 33 prevents damage in the region of the pressure lines or bearing locations supplied by them.

Die beschriebene Ölpumpe besteht aus wenigen Bauteilen; in einer besonders einfachen Ausführungsform (Fig. 1 - 5) verzichtet sie sogar auf die Verwendung verschleißanfälliger Dichtungen zwischen Kolbenplatte und Zylindertopf; für die schmale Exzenterstange wird nur wenig Raum in axialer Richtung der Kurbelwelle benötigt. Durch den Antrieb entsprechend der Kurbelwellendrehzahl erzeugt die Ölpumpe im Sinne einer einfach wirkenden Kolbenpumpe einen intermittierenden Ölstrom, dessen Fördermenge den jeweiligen Erfordernissen durch entsprechende Dimensionierung der Ölpumpe angepaßt werden kann. Beispielsweise beträgt die Fördermenge bei einem Innendurchmesser des Zylindertopfs 2 von 36 mm knapp zwei Liter/Minute bei einer Drehzahl von 3.000 Umdrehungen/Minute. Weitere Einflußgrößen auf die Fördermenge sind selbstverständlich der Pumpenhub und die Dimensionierung der verschiedenen Bohrungen, z.B. der Durchgangsbohrungen 17 in der Kolbenplatte 3, der Schlitze 20 im Halsteil 9 und der radialen Bohrungen 6 in der Hohlschraube 4. Die Ölpumpe wird zweckmäßig in den Massenausgleich des Hubkolbenmotors miteinbezogen, was bei Einzylindermotoren besonders vorteilhaft ist, weil dadurch der Massenausgleich verbessert werden kann.The oil pump described consists of a few components; in a particularly simple embodiment (FIGS. 1-5), it even dispenses with the use of seals which are susceptible to wear between the piston plate and the cylinder pot; little space is required in the axial direction of the crankshaft for the narrow eccentric rod. By driving according to the crankshaft speed, the oil pump generates an intermittent oil flow in the sense of a single-acting piston pump, the flow rate of which can be adapted to the respective requirements by appropriate dimensioning of the oil pump. For example, the delivery rate for an inner diameter of the cylinder bowl 2 of 36 mm is just under two liters / minute at a speed of 3,000 revolutions / minute. Other influencing variables on the delivery rate are of course the pump stroke and the dimensioning of the various bores, for example the through bores 17 in the piston plate 3, the slots 20 in the neck part 9 and the radial bores 6 in the hollow screw 4. The oil pump is expedient in the mass balance of the reciprocating piston engine included, which is particularly advantageous in single-cylinder engines, because it can improve the mass balance.

Claims (15)

  1. Oil pump for an engine of the reciprocating piston type, with at least one piston/cylinder arrangement, whereof the piston drives the crank shaft by way of a connecting rod, the oil pump comprising an eccentric rod (1) connected to the crank shaft, the free end of which rod supports a piston, which cooperates with a cylinder cup (2) located below oil and open towards the eccentric rod (1), so that the pressure oil is supplied through an oil passage (5) in the eccentric rod (1) to one or more lubricating points, characterised in that the piston is formed by a piston plate (3), which is mounted loosely and with axial play between axial abutments at the end of the eccentric rod (1) adjacent the cylinder and depending on the stroke direction cooperates with the abutments as a suction or pressure valve.
  2. Oil pump according to Claim 1, characterised in that formed on the eccentric rod (1) is a sliding bearing ring (14) with a bearing bore (15) for the eccentric shaft section serving as a bearing seat on the crank shaft.
  3. Oil pump according to Claim 1, characterised in that the piston plate (3) is mounted to float on a neck part (9) projecting axially at the end of the eccentric rod (1) remote from the crank shaft.
  4. Oil pump according to Claim 1, characterised in that the abutment adjacent the crank shaft is constructed as an annular collar (11) of the eccentric rod (1) with a contact surface (12) for the piston plate (3) during the delivery stroke of the oil pump.
  5. Oil pump according to Claim 1, characterised in that the abutment remote from the crank shaft is formed by the head (10) of a hollow screw (4), which is screwed into the front end of the eccentric rod (1) remote from the crank shaft so that the rear side of the head (10) of the hollow screw (4) forms a support surface (13) for the piston plate (3) during the suction stroke of the oil pump.
  6. Oil pump according to Claim 1, characterised in that the piston plate (3) comprises through-holes (17), which are closed during the delivery stroke by the collar (11), so that the pressure oil passes by way of radial openings in the neck part (9) and in the shaft (17) of the hollow screw (4) into the oil passage (5).
  7. Oil pump according to Claim 6, characterised in that the through-holes (17) are open during the suction stroke, the piston plate (3) resting on the rear side of the head (10) of the hollow screw (4) and consequently closing the radial openings in the neck part (9) leading to the oil passage (5).
  8. Oil pump according to Claim 6, characterised in that the radial openings in the neck part (9) are formed by slots (20) in its end face.
  9. Oil pump according to Claim 1, characterised in that the piston plate (3) has a spherical peripheral surface (16).
  10. Oil pump according to Claim 1, characterised in that the piston plate (3) is divided parallel to the plane of the plate and the two plate parts (3a, 3b) together form a peripheral groove (30) open towards the outside, in which a gasket (31) is inserted loosely and with radial play, which bears by its peripheral surface in a sealing manner on the inner wall of the cylinder cup (2).
  11. Oil pump according to Claim 1, characterised in that the piston plate (3) comprises a peripheral groove (30) for receiving a piston ring (32) having a sealing action with respect to the cylinder cup (2).
  12. Oil pump according to Claim 1, characterised in that a peripheral section of the piston plate (3) is formed by an annular lip (33) of elastomeric material.
  13. Oil pump according to Claim 12, characterised in that the annular lip (33) is connected to the piston plate (3) by vulcanization.
  14. Oil pump according to Claim 1, characterised in that the bearing bore (15) in the sliding bearing ring (14) of the eccentric rod (1) comprises an annular groove (22), which serves to lubricate the bearing and is connected by way of an oil bore to the connecting rod bearing of the crank shaft.
  15. Oil pump according to Claim 14, characterised in that connected to the annular groove (22) is an injection nozzle (27) for the cooling of the piston base of the piston of the engine of the reciprocating piston type.
EP94905728A 1993-01-29 1994-01-28 Oil pump for reciprocating piston engines Expired - Lifetime EP0633981B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4302515A DE4302515C2 (en) 1993-01-29 1993-01-29 Oil pump for reciprocating internal combustion engine
DE4302515 1993-01-29
PCT/EP1994/000246 WO1994017305A1 (en) 1993-01-29 1994-01-28 Oil pump for reciprocating piston engines

Publications (2)

Publication Number Publication Date
EP0633981A1 EP0633981A1 (en) 1995-01-18
EP0633981B1 true EP0633981B1 (en) 1996-12-11

Family

ID=6479221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94905728A Expired - Lifetime EP0633981B1 (en) 1993-01-29 1994-01-28 Oil pump for reciprocating piston engines

Country Status (3)

Country Link
EP (1) EP0633981B1 (en)
DE (2) DE4302515C2 (en)
WO (1) WO1994017305A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005060859A1 (en) 2005-12-20 2007-06-28 Robert Bosch Gmbh Method and device for controlling an electric motor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106488A (en) * 1934-02-24 1938-01-25 Westinghouse Air Brake Co Compressor
US2757617A (en) * 1953-01-29 1956-08-07 Jack K Moore Circulating pump
DE1758836U (en) * 1953-12-12 1957-12-27 Porsche Kg PISTON PUMP FOR PUMPING LUBRICATING OIL FOR COMBUSTION MACHINES.
US3282290A (en) * 1964-01-30 1966-11-01 Szczepanski Harry Solvent-circulating system
US3239109A (en) * 1964-10-26 1966-03-08 Santarelli Vincent Sprayer pump
JPS56136176U (en) * 1980-03-14 1981-10-15
US4627798A (en) * 1985-12-05 1986-12-09 Thomas Dalton A Apparatus for circulating cleaning fluid through a cooling system

Also Published As

Publication number Publication date
DE4302515A1 (en) 1994-08-11
DE59401241D1 (en) 1997-01-23
DE4302515C2 (en) 1996-10-02
EP0633981A1 (en) 1995-01-18
WO1994017305A1 (en) 1994-08-04

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