DE749286C - Method for removing precipitates that are deposited on valve cones during operation of an internal combustion engine - Google Patents

Method for removing precipitates that are deposited on valve cones during operation of an internal combustion engine

Info

Publication number
DE749286C
DE749286C DE1942749286D DE749286DA DE749286C DE 749286 C DE749286 C DE 749286C DE 1942749286 D DE1942749286 D DE 1942749286D DE 749286D A DE749286D A DE 749286DA DE 749286 C DE749286 C DE 749286C
Authority
DE
Germany
Prior art keywords
internal combustion
combustion engine
deposited
valve cones
during operation
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
Application number
DE1942749286D
Other languages
German (de)
Inventor
Adolf Friesland
Dipl-Ing Otto Schaefers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Application granted granted Critical
Publication of DE749286C publication Critical patent/DE749286C/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00Electrolytic cleaning, degreasing, pickling or descaling
    • C25F1/02Pickling; Descaling
    • C25F1/04Pickling; Descaling in solution
    • C25F1/06Iron or steel

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Description

Verfahren zur Entfernung von während des Betriebes einer Brennkraftmaschine an Ventilkegeln sich absetzenden Niederschlägen Die Verwendung von durch Zusätze, wie Bleitetraäthyl o. dgl., künstlich klopffest gemachten Brennstoffen als Treibmittel für Brennkraftmaschinen bringt den Nachteil mit sich, daß insbesondere die Auslaßventile nach verhältnismäßigkurzer Betriebszeit an ihrer Mantelfläche Niederschläge aufweisen, die in -der Hauptsache aus Metalloxyden, z. B. Bleioxyd, bestehen. Diese die Wärine schlecht leitenden Niederschläge haben zur Folge, daß an den Ventilkegeln außerdem eine verhältnismäßig starke Ablagerung von Ölkohle erfolgt. Mit der Zeit bildet sich daher eine dichte Niederschlagsschicht,, die in Zeitabständen von den Ventilkegeln entfernt werden muß, um einerseits die Betriebssicherheit der Brennkraftmaschine zu gewährleisten und andererseits dem Fachmann eine zuverlässige Piüfung der Ventilkegel auf Korrosionserscheinungen an ihrem Mantel und die einwandfreie Beurteilung der weiteren Verwendbarkeit der Ventilkegel zu ermöglichen.Method for the removal of during the operation of an internal combustion engine Precipitation deposited on valve cones The use of additives, such as tetraethyl lead or the like, artificially knock-proof fuels as propellants for internal combustion engines has the disadvantage that in particular the exhaust valves show precipitation on their outer surface after a relatively short period of operation, in the main from metal oxides, z. B. lead oxide exist. This the heat Poorly conductive deposits have the consequence that on the valve cones as well a relatively heavy deposit of oil carbon takes place. Forms over time therefore a dense layer of precipitation, which at intervals of time from the valve cone must be removed, on the one hand, to ensure the operational reliability of the internal combustion engine to ensure and on the other hand to the expert a reliable check of the valve cone for signs of corrosion on their coat and the proper assessment of the to enable further usability of the valve cone.

Die mechanische Reinigung der Ventilkegel durch Abklopfen der Niederschläge oder Abbürsten derselben mit Stahldrahtbürsten ist mit der Gefahr verbunden, daß die Oberfläche des Ventilkegels verletzt und damit die gleichmäßige Oberflächenspannung desselben beeinträchtigt wird, was im erneuten Betrieb zur völligen Zerstörung der Ventilkegel führen kann. Andererseits ist eine entsprechend vorsichtige mechanische Reinigung zeitraubend und umständlich.The mechanical cleaning of the valve cone by tapping off the precipitates or brushing the same with steel wire brushes is associated with the risk that damage the surface of the valve cone and thus the uniform surface tension the same is impaired, which in the renewed operation to the complete destruction of the Valve cone can lead. On the other hand, a correspondingly cautious mechanical one Cleaning time consuming and cumbersome.

Die Anwendung der zum Stand der Technik gehörenden Verfahren, z. B. Verfahren zum elektrolytischen Entzundern bzw. Beizen von metallischen Gegenständen, ist bisher allgemein abgelehnt worden, weil der Fachmann grundsätzlich der Ansicht ist, daß Gegenstände, welche mit nicht v erseifbaren Fetten oder Ülen verunreinigt sind, vor der eigentlichen elektrolytischen Behandlung von diesen Verunreinigungen befreit werden müssen. In vorliegendem Falle war daher zunächst das Vorurteil der Fachwelt zu überwinden. Die Bestandteile und die Struktur der Ablagerungen auf den Ventilkegeln, insbesondere das Vorhandensein von Ölkohle, gab nun den Anlaß, trotz des Vorurteils der Fachwelt Ventilkegel der genannten Art versuchsweise-elektrolytisch zu reinigen.The use of the prior art methods, e.g. B. Process for electrolytic descaling or pickling of metallic objects, has so far been generally rejected because the person skilled in the art is of the fundamental opinion is that objects which are contaminated with non-saponifiable fats or oils are, prior to the actual electrolytic treatment of these impurities need to be freed. In the present case, therefore, the prejudice was initially the Overcome professional world. The components and structure of the deposits on the Valve cones, especially the presence of oil carbon, gave now the occasion, despite the prejudice of the professional world, valve cone of the type mentioned experimentally-electrolytically to clean.

Als Ergebnis theoretischer Überlegungen und pralttiscli@r#@ Versuche in der angegebenen Richtung ist nun der Gegenstand vorliegender Erfindung zu werten, welcher es ermöglicht, die Ventilkegel zuverlässig, bequem und in verhältnismäßig kurzer Zeit von den genannten Niederschlägen zu befreien, ohne daß eine mechanischeBeschädigung derWerkstücke eintreten kann.As a result of theoretical considerations and pralttiscli @ r # @ experiments the subject of the present invention is to be assessed in the direction indicated, which makes it possible to use the valve cone reliably, conveniently and in proportion to be freed from the above-mentioned precipitates in a short time without causing mechanical damage the workpieces can enter.

Das den Gegenstand der Erfindung bildende Verfahren besteht darin, daß die Ventilkegel zunächst, einmal oder in Zeitabständen mehrmals, in einem vorzugsweise alkalischen Bade bei kathodischer Schaltung und alsdann in einem anderen, vorzugsweise ebenfalls alkalischen Bade bei anodischer Schaltung behandelt werden.The method forming the subject of the invention consists in that the valve cone initially, once or several times at intervals, preferably in one alkaline bath with cathodic connection and then in another, preferably alkaline baths can also be treated with anodic switching.

Das Zustandekommen der angestrebten Wirkung ist auf die Struktur der Ölkohle zurückzuführen, welche entgegen der bisherigen Ansicht der Fachwelt in jedem Falle einen Stromdurchgang ermöglicht.The creation of the desired effect depends on the structure of the Attributed to oil coal, which contrary to the previous view of experts in each Case allows a current to pass through.

Grundsätzlich kann die elektrolytische Beliandlung in einem sauren, alkalischen oder neutralen Bad durchgeführt werden. Der Ver-Wendung eines alkalischen Elektrolyten wird aber der Vorzug gegeben, weil das Anodenmaterial auf diese Weise weitgehend geschont wird. .In principle, electrolytic coating can be carried out in an acidic, alkaline or neutral bath. The use of an alkaline However, preference is given to electrolytes because the anode material works in this way is largely spared. .

Claims (1)

PATENTANSPRUCH: Verfahren zur Entfernung von während des Betriebes einer Brennkraftmaschine an Ventilkegeln sich absetzenden Niederschlägen, insbesondere für die Reinigung der Auslaßventilkegel von mit durch Zusätze, z. B. Bleitetraäthyl, klopffest ge= machten Kraftstoffen betriebenen Brennkraftmaschinen, dadurch gekennzeichnet, daß die Ventilkegel zunächst, einmal oder in Zeitabständen mehrmals, in einem vorzugsweise alkalischen Bad bei kathodischer Schaltung und alsdann in einem anderen, vorzugsweise ebenfalls alkalischen Bad bei anodischer Schaltung behandelt werden. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden: deutsche Patentschrift ..... N r. 682 735; USA.- - .... Ni-. 1 995 I92.PATENT CLAIM: A method for removing precipitates that settle on valve cones during the operation of an internal combustion engine, in particular for cleaning the exhaust valve cone from with additives such. B. lead tetraethyl, anti-knock ge = made fuels operated internal combustion engines, characterized in that the valve cones are treated first, once or several times, in a preferably alkaline bath with cathodic connection and then in another, preferably also alkaline bath with anodic connection. To distinguish the subject of the application from the state of the art, the following publications were taken into account in the granting procedure: German patent specification ..... N o. 682 735; USA.- - .... Ni-. 1 995 I92.
DE1942749286D 1942-05-16 1942-05-16 Method for removing precipitates that are deposited on valve cones during operation of an internal combustion engine Expired DE749286C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE749286T 1942-05-16

Publications (1)

Publication Number Publication Date
DE749286C true DE749286C (en) 1944-12-02

Family

ID=5886870

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1942749286D Expired DE749286C (en) 1942-05-16 1942-05-16 Method for removing precipitates that are deposited on valve cones during operation of an internal combustion engine

Country Status (2)

Country Link
CH (1) CH233582A (en)
DE (1) DE749286C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1995192A (en) * 1931-06-04 1935-03-19 Robert L Kahn Cleaning iron or steel
DE682735C (en) * 1937-10-07 1939-10-21 Siemens & Halske Akt Ges Process for pickling and descaling iron and steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1995192A (en) * 1931-06-04 1935-03-19 Robert L Kahn Cleaning iron or steel
DE682735C (en) * 1937-10-07 1939-10-21 Siemens & Halske Akt Ges Process for pickling and descaling iron and steel

Also Published As

Publication number Publication date
CH233582A (en) 1944-08-15

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