Variable camshaft timing system for improved operation during lo

Details Variable camshaft timing system for improved operation during lo Variable camshaft timing system for improved operation during lo

1993-07-26

1994-11-29

Wolfe, Willis R.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 134

Patent

active

053679920

ABSTRACT:
A variable camshaft timing system (VCT system) for an internal combustion engine having a rotatable crankshaft (22) and a rotatable camshaft (26, 126). The camshaft (26, 126) is position variable relative to the crankshaft (22). A spool valve (192) including a spool (200) slidable within a cylindrical member (198) selectively controls the movement of hydraulic fluid for actuating the oscillation of the hydraulic operators (54, 56, 160a, 160b) within the housing recess (132a, 132b) as the housing oscillates with respect to the camshaft (26, 126). In accordance with various aspects of the present invention, the VCT system also includes a means for controlling the position of the spool (200), a means for removing air from the VCT system and seals (160h) for sealing the housing (130) outer periphery to prevent hydraulic fluid from draining out of the VCT system when the engine is shut down.

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