Piston pump for use as high-pressure pump for internal-combustion engine in motor vehicle, has piston displacable in cylinder by cam shaft against force of coil spring, where coil spring has winding direction opposite to another coil spring

摘要

The pump (1) has a piston (7) that is displacable in a cylinder by a cam shaft (3) against the force of a coil spring (13). Another piston (8) is displacable in another cylinder by the cam shaft against the force of another coil spring (14). The latter coil spring has a winding direction that is opposite to the former coil spring. The cam shaft has a cam (4), which cooperates with two roller shafts (9, 10).