Controllable camshaft for a drive, preferably an internal combus

Details Controllable camshaft for a drive, preferably an internal combus Controllable camshaft for a drive, preferably an internal combus

1980-07-18

1985-05-21

Lall, Parshotam S.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

464 2, F01L 108, F01L 134

Patent

active

045179344

ABSTRACT:
A camshaft for the drive of an internal combustion engine has a hollow shaft carrying one or more cams or partial cams and an inner shaft disposed within the hollow shafts and rotatable relative to the hollow shaft. The inner shaft has one or more cams or partial cams disposed outside the hollow shaft and attached for rotation with the inner shaft through clearances in the hollow shaft. A camshaft driving arrangement includes a camshaft timing gear coupled with both shafts and a device responsive to a parameter characteristic of the operating conditions of the drive for adjusting the rotational position of either one or both of the inner and hollow shafts relative to the camshaft timing gear. The adjusting device includes an electric motor fixed on the timing gear and controlled by electrical signals. The motor acts on a threaded spindle which meshes with a counterthread surface on the inner shaft or the outer shaft, or both, for adjusting the relative position of the shaft or shafts relative to top dead center.

REFERENCES:
patent: 3496918 (1970-02-01), Finlay
patent: 3516394 (1970-06-01), Nichols
patent: 3815564 (1974-06-01), Suda et al.
patent: 3978829 (1976-09-01), Takahashi et al.
patent: 4158350 (1979-06-01), Moller et al.

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