The invention relates to a pump, in particular to oil pumps for internal
combustion engines comprising a gear assembly or rotor assembly with one
each of a pressure and suction region arranged in a pump housing, which
may be sealed from each other by means of an axially displaceable piston
valve which defines a supply chamber and a housing cover, closing the pump
housing. The pressure region comprises a pressure channel connected to the
waist of the control piston, whereby the control piston cooperates with a
plunger on the end thereof facing the supply chamber, which is arranged at
right angles to the control piston. The plunger is pre-tensioned against
the control piston by means of a pressure spring, and the plunger and
control piston are connected by means of a sliding surface, arranged at an
angle to the control piston axis.
