초록 ▼

A piezoelectric control valve, for motor fuel injection via an injection valve, includes a hydraulic play-compensation element inside the control valve on the one side, which automatically compensates for possible changes in length of the reference system as a result of piezoceramic setting actions

A piezoelectric control valve, for motor fuel injection via an injection valve, includes a hydraulic play-compensation element inside the control valve on the one side, which automatically compensates for possible changes in length of the reference system as a result of piezoceramic setting actions in the piezoelectric actuator so that, at the same working stroke of the piezoelectric actuator, an identical stroke at the valve is also always ensured. A hydraulic stroke transmission inside the control valve on the other side, provide a valve stroke corresponding to a multiple of the working stroke.

대표청구항 ▼

Piezoelectric control valve for controlling a motor fuel injection via an injection valve in internal-combustion engines comprising: a control valve in a housing for controlling said injection valve; a valve piston driving said control valve; a tappet cylinder in said housing; a piezoelectric driver

Piezoelectric control valve for controlling a motor fuel injection via an injection valve in internal-combustion engines comprising: a control valve in a housing for controlling said injection valve; a valve piston driving said control valve; a tappet cylinder in said housing; a piezoelectric driver for moving said tappet cylinder when energized; a stroke transmission fluid chamber between said tappet cylinder and said valve piston for transmitting movement therebetween; and hydraulic play-compensating means connected to said stroke transmission fluid chamber for equalizing fluid pressure in said stroke transmission fluid chamber resulting from a change in the volume of said stroke transmission fluid chamber resulting from a return stroke of said piezoelectric driver.