The invention concerns a control device for adjusting the relative angular position
of a driven shaft, particularly a camshaft of an internal combustion engine, said
device comprising a drive pinion that is rotatably connected to the shaft, an adjusting
element (1) for the angular adjustment of the drive pinion relative to the
shaft, two chambers (2, 3) that are alternately supplied with hydraulic
fluid and a control valve (6) for actuating the adjusting element (1),
said control valve being connected to the chambers (2, 3) of the adjusting
element (1) through pressure medium channels (4, 5). The control
valve (6) comprises a valve body (7) that has two working connections
A and B for the pressure medium channels (4, 5), a delivery connection P
for the supply of hydraulic fluid and a discharge connection T for the discharge
of hydraulic fluid, and the control valve (6) further comprises a sliding
valve control piston (8) for setting different hydraulic resistances W between
the individual connections. In an intermediate adjusted position of the valve control
piston (8), for setting an intermediate phase angle, a lower hydraulic resistance
W prevails between the delivery connection P and that one of the working connections
A and B at which a design-related, higher fluid leakage V occurs.
