A solenoid-valve-controlled fuel-injection pump for internal combustion engines,
in particular diesel engines, has a solenoid valve, whose valve needle separates
a high-pressure region from a low-pressure region, i.e. connects the high-pressure
region and low-pressure region, in the pump housing, via a valve seat; the injection
period being controlled by the opening of the solenoid valve. In addition, a low-pressure
compensating piston situated in the low-pressure region is provided in order to
compensate for pressure fluctuations in the low-pressure region. The exceptional
feature is that the low-pressure compensating piston, which is positioned coaxially
to the solenoid-valve needle, takes the form of a component part that is separate
from the solenoid-valve needle. This ensures that the solenoid valve is opened
unhindered and as rapidly as possible by the opening force exerted on the solenoid-valve
needle by the electromagnet.
