Ignition timing

Details Ignition timing Ignition timing

1978-07-12

1981-07-14

Myhre, Charles J.

Internal-combustion engines

Igniters

Sparkers

123149C, 123149D, F22B 706

Patent

active

042780543

ABSTRACT:
An ignition timing method and apparatus for presetting the ignition timing of an internal combustion engine having a rotatable shaft and a wheel supported on that shaft carrying a portion of the ignition system with another portion of that ingition system supported by the engine in a relatively fixed position adjacent the wheel. A slot is provided in the shaft surface generally parallel to the axis of rotation of that shaft and a further slot is provided along an inner hub of the wheel so as to be generally alignable with the shaft slot when the wheel is supported on the shaft. A selected one of several different keys is captured between the wheel hub and the shaft so that a portion of the selected key occupies the shaft slot and another portion of the selected key occupies the wheel slot to thereby fix the angular relationship between the shaft and wheel at an angular offset determined by the particular key selected. Typically both the engine driven shaft and the wheel hub are matingly tapered with the hub keyway being wider than the shaft keyway so that with any of the selected keys the hub slot will span the shaft slot but the two slots will be offset by differing amounts as determined by the selected key. A particular key is associated with a particular type ignition system so that the engine and its keywayed shaft along with the wheel and its keywayed hub may be employed with any of several different ignition systems so long as the key associated with a particular ignition system is used to join the wheel and shaft. The key itself in cross-section along a plane generally perpendicular to the axis of rotation of the shaft is generally T-shaped with the vertical portion of the T intended to occupy the shaft slot while the upper horizontal portion of the T is intended to occupy the hub slot. The T is asymmetrical in the sense that the T base joins the T upper cross member at other than the center of that cross member. One T might be symmetrical in cross-section while another might have its vertical portion displaced toward the right and yet a third might have its vertical portion displaced toward the left, giving three or more different possible ignition timing angles, depending upon the T configuration chosen.

REFERENCES:
patent: 1816552 (1931-07-01), Trusler
patent: 2404617 (1946-07-01), Wilkenson
patent: 3145036 (1964-08-01), Blum
patent: 3187213 (1965-06-01), Seidl et al.
patent: 3192439 (1965-06-01), Shaw
patent: 3554179 (1971-01-01), Bunson
patent: 4030466 (1977-06-01), Lace

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