Patent ID: 7007652
Filing Date: 2006-03-07
Classification: F01L,Y10T

Abstract:
1. A variable duration valve timing camshaft comprising: an inner shaft; an outer shaft; at least one cam assembly having a fixed cam lobe and a lobe modifying segment, the fixed cam lobe being mounted on the outer shaft for rotation therewith and having an angular aperture of a first angle therein, the lobe modifying segment subtending a second angle, smaller than the first angle, and being mounted on the inner shaft for angular movement therewith within said angular aperture; and means to angularly move the inner shaft relative to the outer shaft so as to move the lobe modifying segment relative to the fixed cam lobe between a first position in which the duration of the camshaft is the duration of the fixed cam lobe and a second position in which the lobe modifying segment protrudes from the profile of the fixed cam lobe to increase the duration of the cam assembly from that from that of the fixed cam lobe.