| 摘要 |
The unit has a dosing chamber (6) and a displacement body (8), where the displacement body is moved linearly by a connecting rod (10). A helical spring designed as a compression spring (20) pressurizes the connecting rod with force in movement direction. The helical spring is formed at an axial end such that an end of a spring wire is axially projected in relation to an adjoining winding in a relaxed state. The helical spring comprises a smoothed contact surface at the axial end, where the contact surface is defined at the axial end and extended toward a longitudinal axis of the spring. |
