DE655517C

DE655517C - Compound crankshaft

Info

Publication number: DE655517C
Application number: DEH141518D
Authority: DE
Inventors: Dr-Ing Walter Benz
Original assignee: Humboldt Deutzmotoren AG
Current assignee: Humboldt Deutzmotoren AG
Priority date: 1934-10-16
Filing date: 1934-10-16
Publication date: 1938-01-17

Description

DEUTSCHES REICHGERMAN EMPIRE

AUSGEGEBEN AM
17. JANUAR 1938ISSUED ON
JANUARY 17, 1938

REICHSPATENTAMTREICH PATENT OFFICE

PATENTSCHRIFTPATENT LETTERING

•KLASSE 47b GRUPPE• CLASS 47b GROUP

Humboldt-Deutzmotoren Akt.-Ges. in Köln-Deutz*)Humboldt-Deutzmotoren Akt.-Ges. in Cologne-Deutz *)

Zusammengesetzte KurbelwelleCompound crankshaft

Patentiert im Deutschen Reiche vom 16. Oktober 1934 abPatented in the German Empire on October 16, 1934

Die Erfindung bezieht sich auf zusammengesetzt Kurbelwellen, bei denen die Wellenzapfen durch einen gleichachsigen Schraubenbolzen stirnseitig gegen die Kurbelwangen S bzw. einen Wellenflansch gepreßt werden.The invention relates to assembled crankshafts in which the shaft journals be pressed on the front side against the crank webs S or a shaft flange by an equiaxed screw bolt.

Bisher hat man Kurbelwellen dieser Art an den Verbindungsstellen mit besonderen Mitnehmern versehen, die zur Aufnahme der Drehkräfte dienen. Beispielsweise wurde eine Verbindung der Kurbelzapfen mit den Wangen ausgeführt, bei der ineinandergreifende radiale Zähne der Stirnflächen eine Zentrierung und die Übertragung der Drehkräfte bewirken. Die Herstellung einer derartigen Verzahnung ist in Anbetracht der erforderlichen Genauigkeit nicht ganz einfach. Die gegenseitige Anpressung der Zähne muß nämlich über den ganzen Umfang genau gleichmäßig sein, damit der Zapfen sich beim Anziehen der Verbindungsschraube nicht schief stellen kann. Ferner muß durch genaue gegenseitige Winkelstellung der vier Verzahnungen eines Kurbelzapfens eine gleichachsige Lage der anschließenden Wellenenden hergestellt werden.So far, you have crankshafts of this type at the connection points with special drivers provided, which serve to absorb the rotational forces. For example, there was a connection between the crank pin and the cheeks executed, with the interlocking radial teeth of the end faces a centering and cause the transmission of the rotational forces. The production of such a Toothing is not that easy in view of the accuracy required. the Mutual pressing of the teeth must namely over the entire circumference exactly evenly so that the pin cannot tilt when the connecting screw is tightened. It must also be accurate mutual Angular position of the four teeth of a crank pin an equiaxed position of the subsequent shaft ends.

Durch die Erfindung wird eine erhebliche Vereinfachung in der Herstellung zusammengesetzter Kurbelwellen erreicht, die außerdem eine Erhöhung der Herstellungsgenauigkeit mit sich bringt. Erfindungsgemäß werden die Stirnflächen so stark gegeneinandergepreßt, daß die auftretenden Drehkräfte ohne Anwendung von Mitnehmern lediglich durch Haftreibung übertragen werden. Die Stirnflächen können also einfach abgedreht bzw. geschliffen sein. Die Rechnung hat gezeigt, daß ein offenbar gegen diese einfache Ausbildung bestehendes Vorurteil nicht berechtigt ist. Die stirnseitige Anpressung der Wellenzapfen soll an sich so groß sein, daß die im Betrieb auftretenden Biegungskräfte an keiner Seite des Zapfenumfanges die gegeneinandergepreßten Flächen abheben können. Diese Anpressung liegt bei praktisch brauchbaren Größenverhältnissen so hoch, daß die Drehkräfte ohne weiteres durch Haftreibung aufgenommen werden.The invention significantly simplifies the manufacture of composite Achieved crankshafts, which also brings an increase in manufacturing accuracy with it. According to the End faces pressed against each other so strongly that the torsional forces that occur without application are only transferred by drivers through static friction. The end faces can therefore simply be turned or ground be. The calculation has shown that there is obviously one against this simple training Prejudice is not justified. The face pressure of the shaft journals should be be so great that the bending forces occurring during operation are not on either side of the Pin circumference can lift the surfaces pressed against each other. This pressure is so high in practically usable proportions that the torsional forces without further can be absorbed by static friction.

Zur Erhöhung der Sicherheit werden an den Verbindungsstellen gegebenenfalls dünne Zwischenlagen eines anderen Werkstoffes zur Verbesserung der Haftreibung vorgesehen. Dafür kommen beispielsweise leicht verformbare Metalle, Asbest oder eine aufgetragene Lackschicht in Betracht. Zusätzlich können die aufeinandergepreßten Stirnflächen Riefen erhalten, die sich in die Zwischenlage eindrücken und somit durch Keilwirkung ebenfalls die Mitnahme verbessern. Eine besonders einfache Herstellung ergibt sich, wenn die Riefen kreisförmig liegen, da sie in dem Falle eingedreht werden können. Sollte die Anspannung der Verbindungsschraube nichtTo increase security, thin joints may be made at the connection points Intermediate layers of a different material are provided to improve static friction. For example, easily deformable metals, asbestos or an applied one are used for this Lacquer layer into consideration. In addition, the end faces pressed onto one another can have grooves obtained that press into the intermediate layer and thus also by wedge effect improve the take-away. A particularly simple production results when the grooves are circular, since they are in the Trap can be screwed in. Should the tension of the connecting screw not

'*) Von dem Patentsucher ist als der Erfinder angegeben worden:'*) The patent seeker stated as the inventor:

Dr.-Ing. Walter Benz in Köln-Dünnwald.Dr.-Ing. Walter Benz in Cologne-Dünnwald.

Claims

suffice to press the grooves deep enough into the intermediate layer, then there is diu Possibility, after a more precise setting, ditL Press surfaces together with the help of a press. · ', - <

The grooves can also radially into the ' End faces of the crank pin and dci Be cut in the crank web. If you only use one proportionately in this case ίο thin intermediate layer, care will be taken, for example by uneven Number of teeth that the grooves of one part do not fill the gaps of the opposite Try to slide in the piece and thereby twist the previously aligned Cause parts. If no intermediate layer is used, it is sufficient to only use one of the overlapping layers Provide end faces with radial grooves. In order to further increase the surface pressure, the opposite In this case, the surface received circular grooves.

It is for all enumerated possible embodiments of the subject matter of the invention It is essential that the end faces are simply rotated and that no precisely interlocking toothing has to be produced. The drawing shows a composite crankshaft with different designs the connection shown.

The two hollow crank pins a rest with their flat end faces against corresponding approaches of the crank webs b, c and d . Inside the pin there is a screw bolt f, the shaft of which centering the crank pin with respect to the cheek. In order to increase the surface pressure, the bore of the pin a and the crank webs is widened at the application points, so that a narrower ring surface comes to rest.

The crank web b is made in one piece with the shaft end g. Of course, a split version could also be used here. The fastening of the flywheel h corresponds again to the crank pin connection. In this case, the flywheel hub is centered directly on the outer cylindrical surface of the pin. The screw bolt / inserted at the right end with a thread, which was made quite strong in the crank pin connection described above, can therefore be given a smaller diameter. The intention is to obtain a greater stretching of the boom with the same pressing of the end faces, so that the tension can be more precisely correct when the nut is tightened.

The right shaft end k , like the crank pin, is manufactured separately. The continuous screw bolt m simultaneously establishes the connection with the crank web d and the shaft flange η . These connections differ in that the bore of the shaft journal k forms a direct centering. Here too, the screw bolt m can therefore be made weaker.

The end faces pressed together are shown in the drawing as smooth surfaces. In any case, however, the options described above can be used, namely intermediate layers of a different material in connection with grooves on the end faces as well as such grooves alone.

Ρλ τ ε nt αν s ρ r ü c ηε:

ι. Compound crankshaft in which the shaft journals are equiaxed Screw bolts on the face side against the crank webs or a shaft flange are pressed, characterized by such a strong pressure of the End faces that the occurring rotational forces are transmitted only by static friction without the use of drivers will. go

2. Crankshaft after. Claim 1, characterized in that at the connection points Intermediate layers of a different material are provided to increase the static friction.

3. Crankshaft according to claims 1 and 2, characterized in that at least one of the pressed end faces is provided with grooves, which increase the static friction by deforming the opposite surface.

4. Crankshaft according to claims 1 and 2, characterized in that the pressed end faces with interlocking annular recess fin are provided.

1 sheet of drawings