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(11) | EP 1 128 026 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Multi-position variable cam timing system having a vane-mounted locking piston device |
| (57) An internal combustion engine having a camshaft (14) and variable camshaft timing
system, where a rotor (22) is secured to the camshaft (14) and is rotatable but non-oscillatable
with respect to the camshaft (14). A housing (68) circumscribes the rotor(22), is
rotatable with both the rotor (22) and the camshaft (14), and is further oscillatable
with respect to both the rotor (22) and the camshaft (14) between a fully retarded
position and a fully advanced position. A locking configuration prevents relative
motion between the rotor and the housing (68), and is mounted within either the rotor
(22) or the housing (68), and is respectively and releasably engageable with the other
of either the rotor (22) and the housing (68) in the fully retarded position, the
fully advanced position, and in positions therebetween. The locking device includes
a locking piston (42) having keys (46) terminating one end (44) thereof, and serrations
(60) mounted opposite the keys (46) on the locking piston (42) for interlocking the
rotor (22) to the housing (68). A controlling configuration controls oscillation of
the rotor (22) relative to the housing (68). |