Patent ID: 8333173
Filing Date: 2012-12-18
Classification: F01L,F02D,Y02T

Abstract:
1. A camshaft assembly comprising: a shaft; and a lobe member fixed for rotation with the shaft and including a base circle and a lobe extending radially outward from the base circle, the lobe including a valve closing profile defined between a peak of the lobe and an ending point of the lobe on the base circle and a valve opening portion defined between a starting point on the lobe and the peak, the valve closing profile defining a closing flank and a closing ramp extending from an end of the closing flank to the ending point, the closing ramp having a radial extent from the base circle at the end of the closing flank that is less than 10 percent of the radial extent of the peak from the base circle and having a first angular extent of at least 10 degrees, a second angular extent of the lobe defined between the peak and the ending point being greater than a third angular extent of the lobe defined between the starting point and the peak.