Abstract: An exhaust gas recirculation (EGR) system (11), especially for a diesel engine, having a valve (25), including a valve stem (29,31) and an actuator operable to move the valve (25) between the open (FIG. 1) and closed positions. The actuator includes an electric motor (47) which provides a low torque, high speed rotary output (51) to an input gear (53) of a reduction gear train (55). The output of the gear train is a relatively high torque, low speed rotation of an output gear (79), which is connected by a linkage (83,85) to the input stem (31) of the valve. The gear train (55) includes a torque limiting clutch (67,69) to protect the teeth of the gears, and a coupling arrangement (91) joins the valve stems (29,31) to permit mis-alignment therebetween.

Abstract: A device (10) for varying the angular phase relation between a camshaft (12) and a crankshaft (unshown) in response to axial displacement of an advancing plate (20) drivingly connected to a support (16) via straight splines (16f) and a drive (18) via angled splines (18d). The support (16) is fixed to an end (12a) of the camshaft (12) for rotation therewith. The drive (18) is journaled on the support (16) and is driven by and in phase with the crankshaft. The advancing plate (20) is also threadably connected to a drum (36) via threads (20c,36a) and the axial displacement is effected by relative rotation between the plate (20) and the drum (36). A clockspring (24) reacting between the support (16) and drum (36) tends to rotate the drum (36) faster than the plate (20) for positioning the plate (20) in a first limit position.