EP0814259A1 - Cold start device - Google Patents

Cold start device Download PDF

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Publication number
EP0814259A1
EP0814259A1 EP97109818A EP97109818A EP0814259A1 EP 0814259 A1 EP0814259 A1 EP 0814259A1 EP 97109818 A EP97109818 A EP 97109818A EP 97109818 A EP97109818 A EP 97109818A EP 0814259 A1 EP0814259 A1 EP 0814259A1
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EP
European Patent Office
Prior art keywords
oil
pump
bore
cold start
start device
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97109818A
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German (de)
French (fr)
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EP0814259B1 (en
Inventor
Günter Kampichler
Franz Riepl
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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 EP0814259A1 publication Critical patent/EP0814259A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/001—Arrangements thereof
    • 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
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
    • 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
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/106—Oil reservoirs

Definitions

  • the invention relates to a cold start device in a diesel engine, in particular a single-cylinder diesel engine with direct injection, in which oil removed from the lubricant circuit is collected in an oil vessel arranged above the intake duct and is fed therefrom to the intake duct via a connecting line.
  • the oil tank is connected directly to an oil hole in the lubrication circuit of the engine.
  • An overflow is provided in the rocker arm space to regulate its filling quantity.
  • the oil vessel can also be connected to the lubrication circuit only temporarily by means of a choke.
  • a feed hole in the cylinder head connects the oil tank directly to the intake port. This feed bore is normally closed by shutoff valve means; it can be opened temporarily, namely in the event of a cold start, so that the contents of the oil vessel flow into the intake duct by gravity.
  • the known cold start device requires corresponding lubricating oil holes in the area of the cylinder head and the cylinder head cover for their supply; because of the oil pressure present in the oil vessel, the oil vessel must be securely sealed to the outside, which is problematic because of the actuating rod of the closure valve means which is led out through a bore in a threaded cover.
  • the closure valve means must Check for leaks regularly, otherwise permanent oil losses in the intake duct can be expected.
  • the known cold start device does not allow metered oil supply as a cold start aid. A similar cold start device is described in DD-PS 97714.
  • the present invention has for its object to provide a self-filling cold start device during engine operation, which is unaffected by pressure fluctuations in the lubricating oil circuit, allows the supply of a metered amount of oil from the oil vessel into the intake duct and in which an unwanted feed of leak oil into the intake duct is to be excluded.
  • the oil tank is not connected to an oil pressure line of the engine lubrication, but is arranged in the area of the cylinder head in such a way that spray oil collects there preferably from the rocker arm space.
  • the oil container is therefore designed to be open to collect splash oil, so that a special overflow is unnecessary.
  • the oil vessel is at least partially arranged in the cylinder head and comprises a pump bore open on one side for receiving a pump piston, which is sealed off from the pump bore by means of an annular seal.
  • the pump piston is fully extendable from the pump bore, the spray oil can flow from the oil vessel into the pump bore, in order to be conveyed from there through the connecting line into the intake duct when the pump piston moves in opposite directions.
  • the pumping is advantageously carried out through a wall opening of the pump bore near the ground, which is connected via a riser bore to a feed bore in the intake duct.
  • the amount of oil displaced from the pump bore by the delivery stroke of the piston is raised above the riser bore before it reaches the intake duct by gravity through the feed bore.
  • the starting position of the pump piston is irrelevant. An oil flow through the supply bore can only occur during the delivery stroke of the pump piston, so that there is no need for separate valve means which prevent oil from flowing out into the intake duct.
  • the pump piston by means of an actuating button accessible from the outside, which is arranged at the end of a piston extension, is manually operable.
  • the actuating button can rest on the cylinder head cover from the outside in the retracted position of the pump piston, for example striking against a seat in the cylinder head cover.
  • the piston extension is guided in a guide bore in the cylinder head cover and is sealed with respect to this by means of an annular seal.
  • the piston extension is provided with radial projections which, together with stops on the housing side, limit the maximum piston stroke. Only when the pump piston is subsequently pressed down does it re-enter the pump bore; Only when this sealing position is reached does the actual delivery stroke begin, which ends when the actuating button strikes its seat in the cylinder head cover. The oil displaced from the pump bore thus reaches the intake valve in the intake duct in a precisely metered amount.
  • the oil vessel above the pump bore is funnel-shaped in relation to the latter includes an expanded plenum that ends above the pump bore to the rocker arm space with a low edge web, and that a bulkhead of the cylinder head cover is arranged above the plenum and within the edge land, from where spray oil is conducted into the plenum. From there it then gets into the pump bore, where it either collects above the pump piston that is retracted into it, or, when it is pulled upward out of the pump bore, fills the pump bore.
  • FIG. 1 shows a partial section through a single-cylinder diesel engine in the area of the cylinder head 1 with a cylinder head cover 2, between which a cylinder head cover gasket 3 is arranged.
  • the rocker arm space 4 of the cylinder head cover 2 the rocker arm 5 is shown, the right end of which is seated on a valve rod 6, which in a Valve guide bushing 7 is guided and supported by a valve spring 8.
  • the rocker arm 5 is mounted in the region of the upper end of a tie rod 9.
  • a collecting space 10 is formed, the bottom 11 of which runs in a funnel shape to a central pump bore 12, in which a pump piston 14 provided with an annular seal 13 engages.
  • the pump piston 14 has a piston extension 15 which carries an actuating button 16 in the region of its upper end.
  • a neck part 17 of the piston extension 15 is guided in a guide bore 18 of the cylinder head cover 2 and sealed against the wall thereof by means of an annular seal 19.
  • the piston extension 15 has radial projections 20 which, together with stops 21 on the housing side, limit the maximum extension stroke of the pump piston, as shown in FIG. 2.
  • a spray oil jet 22 is supplied from the bore 23 for the tie rod 9, from where it passes through nozzle bores 24 in a washer 25 against the inside of the cylinder head cover 2 and from there is reflected in the direction of arrow P against a bulkhead 26 of the cylinder head cover 2. From there, the spray oil arrives behind the edge web 27 into the collecting space 10 of the oil vessel 28. Spray oil accumulates in the oil vessel 28 until a maximum oil level is reached, which is predetermined by the edge web 27. Oil flooding the edge web 27 comes out of the Rocker arm space of the cylinder head 1 back down into the engine crankcase.
  • the pump piston In the normal position, the pump piston is in the inserted position shown in Fig. 1, i.e. the spray oil accumulates over the pump piston 14. To meter a quantity of cold start oil, the pump piston is pulled out as shown in FIG. 2, up to the stop position shown. As soon as the pump piston 14 has emerged from the pump bore 12, the oil which has accumulated over the pump piston 14 flows around the pump piston according to arrow F and fills the pump bore 12 to the edge and above.
  • the pump piston 14 If the pump piston 14 is then moved down again, it displaces the oil from the pump bore 12 through a wall opening 29 near the ground, a riser bore 30, a transverse bore 31 into a feed bore 32 through which the oil initially conveyed upward via the riser bore 30 flows down into the intake duct 33, where it is available for combustion on cold start above the inlet valve 34.
  • the section plane runs through the inlet valve 34, so that the connecting line between the pump bore 12 and the intake duct 33 can be seen, as shown in FIG. 1, a section through the outlet valve which is offset in comparison is shown, from which the valve rod 6 is visible .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The cold start device is for an engine in which the oil from the lubricant circuit is collected in an oil vessel (28) above the induction channel (33). It is fed from there via a connecting line into the induction channel. The vessel catches injection oil from the rocker cavity (4). A device is fitted to dose a set amount of oil from the oil vessel and to supply this oil to the induction channel via a boring (30). The oil vessel may be located at least partly within the cylinder head. It may include a pump boring (12) open on one side for a pump piston (14).

Description

Die Erfindung betrifft eine Kaltstartvorrichtung bei einem Dieselmotor, insbesondere einem Einzylinder-Dieselmotor mit Direkteinspritzung, bei welcher dem Schmiermittelkreislauf entnommenes Öl in einem oberhalb dem Ansaugkanal angeordneten Ölgefäß gesammelt und daraus über eine Verbindungsleitung dem Ansaugkanal zugeführt wird.The invention relates to a cold start device in a diesel engine, in particular a single-cylinder diesel engine with direct injection, in which oil removed from the lubricant circuit is collected in an oil vessel arranged above the intake duct and is fed therefrom to the intake duct via a connecting line.

Bei einer derartigen bekannten Kaltstartvorrichtung (EP 0342270 B1) ist das Ölgefäß unmittelbar an eine Ölbohrung des Schmierkreises des Motors angeschlossen. Zum Regulieren seiner Füllmenge ist ein Überlauf in dem Kipphebelraum vorgesehen. Mittels eines Chokes kann das Ölgefäß auch nur vorübergehend mit dem Schmierkreis verbunden sein. Eine Zuführbohrung im Zylinderkopf verbindet das Ölgefäß direkt mit dem Ansaugkanal. Diese Zuführbohrung ist normalerweise durch Verschlußventilmittel verschlossen; sie kann vorübergehend, nämlich im Falle eines Kaltstarts, geöffnet werden, so daß der Inhalt des Ölgefäßes durch die Schwerkraft in den Ansaugkanal fließt.In such a known cold start device (EP 0342270 B1), the oil tank is connected directly to an oil hole in the lubrication circuit of the engine. An overflow is provided in the rocker arm space to regulate its filling quantity. The oil vessel can also be connected to the lubrication circuit only temporarily by means of a choke. A feed hole in the cylinder head connects the oil tank directly to the intake port. This feed bore is normally closed by shutoff valve means; it can be opened temporarily, namely in the event of a cold start, so that the contents of the oil vessel flow into the intake duct by gravity.

Die bekannte Kaltstartvorrichtung erfordert zu ihrer Versorgung entsprechende Schmierölbohrungen im Bereich des Zylinderkopfes und des Zylinderkopfdeckels; wegen des im Ölgefäß anstehenden Öldrucks muß das Ölgefäß sicher nach außen abgedichtet sein, was wegen der durch eine Bohrung eines Gewindedeckels nach außen geführten Betätigungsstange der Verschlußventilmittel problematisch ist. Die Verschlußventilmittel müssen regelmäßig auf Dichtheit überprüft werden, da andernfalls mit ständigen Ölverlusten in den Ansaugkanal zu rechnen ist. Schließlich ermöglicht die bekannte Kaltstartvorrichtung keine dosierte Ölzufuhr als Kaltstarthilfe. Eine ähnlich aufgebaute Kaltstarteinrichtung wird in der DD-PS 97714 beschrieben.The known cold start device requires corresponding lubricating oil holes in the area of the cylinder head and the cylinder head cover for their supply; because of the oil pressure present in the oil vessel, the oil vessel must be securely sealed to the outside, which is problematic because of the actuating rod of the closure valve means which is led out through a bore in a threaded cover. The closure valve means must Check for leaks regularly, otherwise permanent oil losses in the intake duct can be expected. Finally, the known cold start device does not allow metered oil supply as a cold start aid. A similar cold start device is described in DD-PS 97714.

Demgegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine sich während des Motorbetriebs von selbst befüllende Kaltstartvorrichtung zu schaffen, welche von Druckschwankungen im Schmierölkreislauf unbeeinflußt ist, die Zufuhr einer dosierten Ölmenge aus dem Ölgefäß in den Ansaugkanal ermöglicht und bei der eine ungewollte Einspeisung von Lecköl in den Ansaugkanal auszuschließen ist.In contrast, the present invention has for its object to provide a self-filling cold start device during engine operation, which is unaffected by pressure fluctuations in the lubricating oil circuit, allows the supply of a metered amount of oil from the oil vessel into the intake duct and in which an unwanted feed of leak oil into the intake duct is to be excluded.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved by the features of claim 1.

Bei der erfindungsgemäßen Kaltstartvorrichtung ist das Ölgefäß nicht an eine Öldruckleitung der Motorschmierung angeschlossen, sondern im Bereich des Zylinderkopfs derart angeordnet, daß sich dort Spritzöl bevorzugt aus dem Kipphebelraum sammelt. Das Ölgefäß ist also zum Auffangen von Spritzöl entsprechend offen ausgebildet, so daß sich ein besonderer Überlauf erübrigt.In the cold start device according to the invention, the oil tank is not connected to an oil pressure line of the engine lubrication, but is arranged in the area of the cylinder head in such a way that spray oil collects there preferably from the rocker arm space. The oil container is therefore designed to be open to collect splash oil, so that a special overflow is unnecessary.

Zum Dosieren und Fördern einer bestimmten Ölmenge aus dem Ölgefäß in den Ansaugkanal sind nach der erfindungsgemäßen Lösung gesonderte Verschlußventilmittel nicht erforderlich. Stattdessen ist vorgesehen, daß das Ölgefäß zumindest teilweise im Zylinderkopf angeordnet ist und eine einseitig offene Pumpenbohrung zur Aufnahme eines Pumpenkolbens umfaßt, der gegenüber der Pumpenbohrung mittels einer Ringdichtung abgedichtet ist. Dadurch, daß der Pumpenkolben vollständig aus der Pumpenbohrung ausziehbar ist, kann das Spritzöl aus dem Ölgefäß in die Pumpenbohrung einströmen, um von dort bei gegenläufiger Bewegung des Pumpenkolbens durch die Verbindungsleitung in den Ansaugkanal gefördert zu werden.For dosing and delivering a certain amount of oil from the oil container into the intake duct, there are separate solutions according to the solution according to the invention Closure valve means not required. Instead, it is provided that the oil vessel is at least partially arranged in the cylinder head and comprises a pump bore open on one side for receiving a pump piston, which is sealed off from the pump bore by means of an annular seal. Characterized in that the pump piston is fully extendable from the pump bore, the spray oil can flow from the oil vessel into the pump bore, in order to be conveyed from there through the connecting line into the intake duct when the pump piston moves in opposite directions.

Die Förderung erfolgt dabei vorteilhaft durch eine bodennahe Wandöffnung der Pumpenbohrung, die über eine Steigbohrung mit einer Zuführbohrung in den Ansaugkanal verbunden ist. Dabei wird die durch den Förderhub des Kolbens aus der Pumpenbohrung verdrängte Ölmenge erst über die Steigbohrung angehoben, bevor sie durch Schwerkraft über die Zuführbohrung in den Ansaugkanal gelangt. Die Ausgangsstellung des Pumpenkolbens spielt dabei keine Rolle. Ein Ölfluß durch die Zuführbohrung kann nur während des Förderhubs des Pumpenkolbens zustandekommen, so daß sich gesonderte Ventilmittel, die ein ungewolltes Abströmen von Öl in den Ansaugkanal verhindern, erübrigen.The pumping is advantageously carried out through a wall opening of the pump bore near the ground, which is connected via a riser bore to a feed bore in the intake duct. The amount of oil displaced from the pump bore by the delivery stroke of the piston is raised above the riser bore before it reaches the intake duct by gravity through the feed bore. The starting position of the pump piston is irrelevant. An oil flow through the supply bore can only occur during the delivery stroke of the pump piston, so that there is no need for separate valve means which prevent oil from flowing out into the intake duct.

Nach einer zweckmäßigen Ausführungsform der Erfindung ist vorgesehen, daß der Pumpenkolben mittels eines von außen zugänglichen Betätigungsknopfs, der am Ende einer Kolbenverlängerung angeordnet ist, handbetätigbar ist. Der Betätigungsknopf kann dabei in der eingefahrenen Lage des Pumpenkolbens von außen auf dem Zylinderkopfdeckel aufliegen, z.B. gegen einen Sitz im Zylinderkopfdeckel anschlagen.According to an expedient embodiment of the invention it is provided that the pump piston by means of an actuating button accessible from the outside, which is arranged at the end of a piston extension, is manually operable. The actuating button can rest on the cylinder head cover from the outside in the retracted position of the pump piston, for example striking against a seat in the cylinder head cover.

Vorteilhaft ist vorgesehen, daß die Kolbenverlängerung in einer Führungsbohrung im Zylinderkopfdeckel geführt und mittels einer Ringdichtung gegenüber dieser abgedichtet ist.It is advantageously provided that the piston extension is guided in a guide bore in the cylinder head cover and is sealed with respect to this by means of an annular seal.

Um sicherzustellen, daß der Pumpenkolben über die Pumpenbohrung angehoben wird, so daß deren gesamtes Volumen als Dosage zur Verfügung steht, ist vorgesehen, daß die Kolbenverlängerung mit radialen Vorsprüngen versehen ist, welche zusammen mit gehäuseseitigen Anschlägen den maximalen Kolbenhub begrenzen. Erst bei nachfolgendem nach unten Drücken des Pumpenkolbens tritt dieser wieder in die Pumpenbohrung ein; erst mit Erreichen dieser Dichtposition beginnt der eigentliche Förderhub, welcher mit dem Anschlagen des Betätigungsknopfs auf seinem Sitz im Zylinderkopfdeckel beendet ist. Das dabei aus der Pumpenbohrung verdrängte Öl gelangt somit in genau dosierter Menge vor das Einlaßventil im Ansaugkanal.To ensure that the pump piston is raised above the pump bore so that its entire volume is available as a dosage, it is provided that the piston extension is provided with radial projections which, together with stops on the housing side, limit the maximum piston stroke. Only when the pump piston is subsequently pressed down does it re-enter the pump bore; Only when this sealing position is reached does the actual delivery stroke begin, which ends when the actuating button strikes its seat in the cylinder head cover. The oil displaced from the pump bore thus reaches the intake valve in the intake duct in a precisely metered amount.

Um die Befüllung der Pumpenbohrung mit Spritzöl sicherzustellen, ist erfindungsgemäß ferner vorgesehen, daß das Ölgefäß oberhalb der Pumpenbohrung einen gegenüber dieser trichterförmig erweiterten Sammelraum umfaßt, der über der Pumpenbohrung zum Kipphebelraum hin mit einem niedrigen Randsteg endet, und daß eine Spritzwand des Zylinderkopfdeckels oberhalb des Sammelraums und innerhalb des Randstegs angeordnet ist, von wo aus Spritzöl in den Sammelraum geleitet wird. Von dort gelangt es dann in die Pumpenbohrung, wo es sich entweder über dem darin eingefahrenen Pumpenkolben ansammelt oder, wenn dieser nach oben aus der Pumpenbohrung herausgezogen ist, die Pumpenbohrung füllt.In order to ensure that the pump bore is filled with spray oil, it is also provided according to the invention that the oil vessel above the pump bore is funnel-shaped in relation to the latter includes an expanded plenum that ends above the pump bore to the rocker arm space with a low edge web, and that a bulkhead of the cylinder head cover is arranged above the plenum and within the edge land, from where spray oil is conducted into the plenum. From there it then gets into the pump bore, where it either collects above the pump piston that is retracted into it, or, when it is pulled upward out of the pump bore, fills the pump bore.

Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert. Es zeigt

Fig. 1
einen Teilschnitt durch Zylinderkopf und Zylinderkopfdeckel im Bereich der Kaltstartvorrichtung beim eingefahrenem Pumpenkolben und
Fig. 2
einen weiteren, gegenüber Fig. 1 verlagerten Teilschnitt durch Zylinderkopf und Zylinderkopfdeckel im Bereich der Kaltstartvorrichtung mit ausgezogenem Pumpenkolben.
An exemplary embodiment of the invention is explained below with reference to the drawing. It shows
Fig. 1
a partial section through the cylinder head and cylinder head cover in the area of the cold start device when the pump piston is retracted and
Fig. 2
a further partial section, shifted compared to FIG. 1, through the cylinder head and cylinder head cover in the area of the cold start device with the pump piston extended.

Fig. 1 zeigt einen Teilschnitt durch einen Einzylinder-Dieselmotor im Bereich des Zylinderkopfs 1 mit Zylinderkopfdeckel 2, zwischen denen eine Zylinderkofpdeckeldichtung 3 angeordnet ist. Im Kippehebelraum 4 des Zylinderkopfdeckels 2 ist der Kipphebel 5 dargestellt, dessen rechtes Ende auf einer Ventilstange 6 aufsitzt, die in einer Ventilführungsbuchse 7 geführt und mittels einer Ventilfeder 8 abgestützt ist. Der Kipphebel 5 ist im Bereich des oberen Endes eines Zugankers 9 gelagert. Im Zylinderkopf 1 ist ein Sammelraum 10 ausgebildet, dessen Boden 11 trichterförmig zu einer zentralen Pumpenbohrung 12 verläuft, in welche ein mit Ringdichtung 13 versehen Pumpenkolben 14 eingreift. Der Pumpenkolben 14 besitzt eine Kolbenverlängerung 15, welche im Bereich ihres oberen Endes einen Betätigungsknopf 16 trägt. Ein Halsteil 17 der Kolbenverlängerung 15 ist in einer Führungsbohrung 18 des Zylinderkopfdeckels 2 geführt und mittels einer Ringdichtung 19 gegen deren Wand abgedichtet. Die Kolbenverlängerung 15 besitzt radiale Vorsprünge 20, welche zusammen mit gehäuseseitigen Anschlägen 21 den maximalen Ausfahrhub des Pumpenkolbens begrenzen, wie in Fig. 2 dargestellt.1 shows a partial section through a single-cylinder diesel engine in the area of the cylinder head 1 with a cylinder head cover 2, between which a cylinder head cover gasket 3 is arranged. In the rocker arm space 4 of the cylinder head cover 2, the rocker arm 5 is shown, the right end of which is seated on a valve rod 6, which in a Valve guide bushing 7 is guided and supported by a valve spring 8. The rocker arm 5 is mounted in the region of the upper end of a tie rod 9. In the cylinder head 1, a collecting space 10 is formed, the bottom 11 of which runs in a funnel shape to a central pump bore 12, in which a pump piston 14 provided with an annular seal 13 engages. The pump piston 14 has a piston extension 15 which carries an actuating button 16 in the region of its upper end. A neck part 17 of the piston extension 15 is guided in a guide bore 18 of the cylinder head cover 2 and sealed against the wall thereof by means of an annular seal 19. The piston extension 15 has radial projections 20 which, together with stops 21 on the housing side, limit the maximum extension stroke of the pump piston, as shown in FIG. 2.

Ein Spritzölstrahl 22 wird versorgt aus der Bohrung 23 für den Zuganker 9, von wo er über Düsenbohrungen 24 in einer Beilagscheibe 25 gegen die Innenseite des Zylinderkopfdeckels 2 gelangt und von dort in Richtung des Pfeils P gegen eine Spritzwand 26 des Zylinderkopfdeckels 2 reflektiert wird. Von dort gelangt das Spritzöl hinter den Randsteg 27 in den Sammelraum 10 des Ölgefäßes 28. Im Ölgefäß 28 sammelt sich Spritzöl an, bis ein maximaler Ölstand erreicht wird, welcher durch den Randsteg 27 vorgegeben ist. Den Randsteg 27 überflutendes Öl gelangt aus dem Kipphebelraum des Zylinderkopfs 1 wieder nach unten in den Kurbelraum des Motors.A spray oil jet 22 is supplied from the bore 23 for the tie rod 9, from where it passes through nozzle bores 24 in a washer 25 against the inside of the cylinder head cover 2 and from there is reflected in the direction of arrow P against a bulkhead 26 of the cylinder head cover 2. From there, the spray oil arrives behind the edge web 27 into the collecting space 10 of the oil vessel 28. Spray oil accumulates in the oil vessel 28 until a maximum oil level is reached, which is predetermined by the edge web 27. Oil flooding the edge web 27 comes out of the Rocker arm space of the cylinder head 1 back down into the engine crankcase.

In der Normalstellung befindet sich der Pumpenkolben in der in Fig. 1 gezeichneten eingeschobenen Lage, d.h. das Spritzöl sammelt sich über dem Pumpenkolben 14 an. Zum Dosieren einer Kaltstart-Ölmenge wird der Pumpenkolben wie in Fig. 2 dargestellt ausgezogen, bis zu der gezeigten Anschlagposition. Sobald der Pumpenkolben 14 aus der Pumpenbohrung 12 ausgetreten ist, strömt das Öl, welches sich über dem Pumpenkolben 14 angesammelt hat, um den Pumpenkolben herum gemäß Pfeil F und füllt die Pumpenbohrung 12 bis zum Rand und darüber an. Wird danach der Pumpenkolben 14 wieder nach unten gefahren, so verdrängt er das Öl aus der Pumpenbohrung 12 durch eine bodennahe Wandöffnung 29, eine Steigbohrung 30, eine Querbohrung 31 in eine Zuführbohrung 32, durch welche das zunächst über die Steigbohrung 30 nach oben geförderte Öl nach unten in den Ansaugkanal 33 abfließt, wo es für die Verbrennung beim Kaltstart oberhalb des Einlaßventils 34 zur Verfügung steht.In the normal position, the pump piston is in the inserted position shown in Fig. 1, i.e. the spray oil accumulates over the pump piston 14. To meter a quantity of cold start oil, the pump piston is pulled out as shown in FIG. 2, up to the stop position shown. As soon as the pump piston 14 has emerged from the pump bore 12, the oil which has accumulated over the pump piston 14 flows around the pump piston according to arrow F and fills the pump bore 12 to the edge and above. If the pump piston 14 is then moved down again, it displaces the oil from the pump bore 12 through a wall opening 29 near the ground, a riser bore 30, a transverse bore 31 into a feed bore 32 through which the oil initially conveyed upward via the riser bore 30 flows down into the intake duct 33, where it is available for combustion on cold start above the inlet valve 34.

Während gemäß Fig.2 die Schnittebene durch das Einlaßventil 34 verläuft, so daß man die Verbindungsleitung zwischen der Pumpenbohrung 12 und dem Ansaugkanal 33 erkennen kann, ist gemäß Fig. 1 ein demgegenüber versetzter Schnitt durch das Auslaßventil dargestellt, von welchem die Ventilstange 6 sichtbar ist.2, the section plane runs through the inlet valve 34, so that the connecting line between the pump bore 12 and the intake duct 33 can be seen, as shown in FIG. 1, a section through the outlet valve which is offset in comparison is shown, from which the valve rod 6 is visible .

Weder in der in Fig. 1 gezeigten abgesenkten Stellung des Pumpenkolbens 14 noch in der in Fig. 2 dargestellten angehobenen Stellung des Pumpenkolbens 14 kann Öl aus dem Ölgefäß 28 über die Zuführbohrung 32 in den Ansaugkanal 33 abfließen. Erst durch das Betätigen des angehobenen Pumpenkolbens 14, indem letzterer durch Eindrücken des Betätigungsknopfs 16 nach unten bewegt wird, kommt es zur Förderung einer durch die Größe der Pumpenbohrung 12 definierten Ölmenge, welche über die Steigbohrung 30 in die Zuführbohrung 33 überströmen kann. Das Ölgefäß 28 bzw. die Pumpenbohrung 12 sind derart dimensioniert, daß ein Pumpenhub in der Regel für einen Startvorgang reicht und daß insgesamt vier bis fünf Startvorgänge hintereinander möglich sind. Ist das Ölgefäß 28 leergepumpt, so kann Motoröl von außen mittels einer Ölkanne nachgefüllt werden. Zu diesem Zweck wird der Pumpenkolben 14 ausgefahren und es wird Öl in radial und nach unten offene Ausnehmungen 35 der Kolbenverlängerung 15 nachgefüllt.Neither in the lowered position of the pump piston 14 shown in FIG. 1 nor in the raised position of the pump piston 14 shown in FIG. 2 can oil flow out of the oil vessel 28 into the intake duct 33 via the supply bore 32. Only when the raised pump piston 14 is actuated, in that the latter is moved downward by pressing in the actuation button 16, does an oil quantity defined by the size of the pump bore 12 emerge, which can flow over the riser bore 30 into the feed bore 33. The oil vessel 28 or the pump bore 12 are dimensioned such that a pump stroke is usually sufficient for one starting process and that a total of four to five starting processes are possible in succession. If the oil tank 28 is pumped empty, engine oil can be refilled from the outside using an oil can. For this purpose, the pump piston 14 is extended and oil is replenished in recesses 35 of the piston extension 15 which are open radially and downwards.

Claims (8)

Kaltstartvorrichtung bei einem Dieselmotor, insbesondere einem Einzylinder-Dieselmotor mit Direkteinspritzung, bei welcher dem Schmiermittelkreislauf entnommenes, aus dem Kipphebelraum aufgefangenes Spritzöl in einem oberhalb des Ansaugkanals (33) angeordneten Ölgefäß (28) gesammelt und daraus über eine Verbindungsleitung dem Ansaugkanal (33) zugeführt wird,
dadurch gekennzeichnet,
daß eine Vorrichtung zum Dosieren und Fördern einer bestimmten Ölmenge aus dem Ölgefäß (28) vorgesehen ist und daß die Vorrichtung über eine einen Teil der Verbindungsleitung bildende Steigbohrung (30) mit dem Ansaugkanal (33) verbunden ist.Cold start device for a diesel engine, in particular a single-cylinder diesel engine with direct injection, in which spray oil taken from the lubricant circuit and collected from the rocker arm chamber is collected in an oil vessel (28) arranged above the intake duct (33) and is fed therefrom to the intake duct (33) via a connecting line ,
characterized,
that a device for metering and delivering a certain amount of oil from the oil vessel (28) is provided and that the device is connected to the suction channel (33) via a riser hole (30) forming part of the connecting line. Kaltstartvorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß das Ölgefäß (28) zumindest teilweise im Zylinderkopf angeordnet ist und eine einseitig offene Pumpenbohrung (12) zur Aufnahme eines Pumpenkolbens (14) umfaßt, der gegenüber der Pumpenbohrung (12) mittels einer Ringdichtung (13) abgedichtet ist.Cold start device according to claim 1,
characterized,
that the oil vessel (28) is at least partially arranged in the cylinder head and comprises a pump bore (12) open on one side for receiving a pump piston (14) which is sealed off from the pump bore (12) by means of an annular seal (13). Kaltstartvorrichtung nach Anspruch 2,
dadurch gekennzeichnet,
daß der Pumpenkolben (14) vollständig aus der Pumpenbohrung (12) ausziehbar ist, so daß das Spritzöl aus dem Ölgefäß (28) in die Pumpenbohrung (12) einströmen kann, um von dort bei gegenläufiger Bewegung des Pumpenkolbens (14) in einer dem Pumpenhub entsprechend dosierten Menge durch die Verbindungsleitung in den Ansaugkanal (33) gefördert zu werden.Cold start device according to claim 2,
characterized,
that the pump piston (14) can be pulled out completely from the pump bore (12), so that the spray oil from the oil vessel (28) into the pump bore (12) can flow in to be conveyed from there through the connecting line into the suction channel (33) in an amount metered in accordance with the pump stroke when the pump piston (14) moves in opposite directions. Kaltstartvorrichtung nach Anspruch 3,
wobei die Verbindungsleitung durch eine bodennahe Wandöffnung (29) der Pumpenbohrung (12), die über die Steigbohrung (30) mit einer Zuführbohrung in den Ansaugkanal (33) verbunden ist, gebildet ist.Cold start device according to claim 3,
wherein the connecting line is formed by a wall opening (29) near the floor of the pump bore (12), which is connected via the riser bore (30) to a feed bore in the intake duct (33). Kaltstartvorrichtung nach Anspruch 2,
dadurch gekennzeichnet,
daß der Pumpenkolben (14) mittels eines von außen zugänglichen Betätigungsknopfs (16), der am Ende einer Kolbenverlängerung (15) angeordnet ist, handbetätigbar ist.Cold start device according to claim 2,
characterized,
that the pump piston (14) can be operated manually by means of an externally accessible actuating button (16) which is arranged at the end of a piston extension (15). Kaltstartvorrichtung nach Anspruch 5,
dadurch gekennzeichnet,
daß die Kolbenverlängerung (15) in einer Führungsbohrung (18) im Zylinderkopfdeckel (2) geführt und mittels einer Ringdichtung (19) gegenüber dieser abgedichtet ist.Cold start device according to claim 5,
characterized,
that the piston extension (15) in a guide bore (18) in the cylinder head cover (2) and is sealed by means of an annular seal (19) against this. Kaltstartvorrichtung nach Anspruch 5,
dadurch gekennzeichnet,
daß die Kolbenverlängerung (15) mit radialen Vorsprüngen (20) versehen ist, welche zusammen mit gehäuseseitigen Anschlägen (21) den maximalen Hub des Pumpenkolbens (14) begrenzen.Cold start device according to claim 5,
characterized,
that the piston extension (15) is provided with radial projections (20) which, together with stops (21) on the housing side, limit the maximum stroke of the pump piston (14). Kaltstartvorrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß das Ölgefäß (28) oberhalb der Pumpenbohrung (12) einen gegenüber dieser trichterförmig erweiterten Sammelraum (10) umfaßt, der über der Pumpenbohrung (12) zum Kipphebelraum (4) hin mit einem niedrigen Randsteg (27) endet und daß eine Spritzwand (26) des Zylinderkopfdeckels (2) oberhalb des Sammelraums (10) und innerhalb des Randstegs (27) angeordnet ist, von wo aus Spritzöl in den Sammelraum (10) geleitet wird.Cold start device according to claim 3,
characterized,
that the oil vessel (28) above the pump bore (12) comprises a funnel-shaped collection space (10) which ends above the pump bore (12) towards the rocker arm space (4) with a low edge web (27) and that a bulkhead (26 ) of the cylinder head cover (2) above the collecting space (10) and within the edge web (27) is arranged, from where spray oil is conducted into the collecting space (10).
EP97109818A 1996-06-19 1997-06-17 Cold start device Expired - Lifetime EP0814259B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19624387 1996-06-19
DE19624387A DE19624387C2 (en) 1996-06-19 1996-06-19 Cold start device

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DE19624387A1 (en) 1998-01-02
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DE19624387C2 (en) 1999-08-19

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