Patent ID: 6647936
Filing Date: 2003-11-18
Classification: F01L

Abstract:
A variable camshaft timing phaser for an internal combustion engine having at least one camshaft comprising:a) a housing having an outer circumference for accepting drive force; b) a rotor for connection to a camshaft, coaxially located within the housing, capable of rotation to shift the relative angular position of the housing and the rotor, having a tapered recess in an outer circumference; c) a locking pin slidably located in a radial bore in the housing adjacent the rotor, comprising a body having a diameter adapted to a fluid-tight fit in the radial bore, and an inner end toward the rotor with a tapered portion adapted to fit in the tapered recess, the locking pin being radially moveable in the bore from a locked position in which the tapered end fits into the tapered recess, locking the relative angular position of the housing and the rotor, to an unlocked position, in which the tapered end does not engage the rotor; d) a spring located in the radial bore opposite the inner end of the locking pin, urging the locking pin radially inward toward the locked position; and e) a tortuous fluid passage coupling the tapered recess to a supply of pressurized oil, such that a time delay is introduced in moving the tapered end of the locking pin from the tapered recess in the rotor.