Pulsation damper

摘要

A high-pressure pump has an elastic member arranged in a damper chamber between a first diaphragm and a second diaphragm. The elastic member is always in contact with both diaphragms while the high-pressure pump is operated. When the diaphragms are further vibrated due to a resonance under a situation where a frequency of the pressure pulsation of low-pressure fuel is in agreement with the characteristic frequency of the diaphragms, the elastic member restricts the deformation of the diaphragms. Therefore, the resonance of the first diaphragm and the second diaphragm can be restricted.

主权项

1. A pulsation damper, comprising:
a first diaphragm; a second diaphragm arranged in the fuel chamber to define a damper chamber in cooperation with the first diaphragm, the damper chamber being isolated from the fuel chamber; and an elastic member fixed in the damper chamber in such a manner as to be in contact with both the first diaphragm and the second diaphragm; wherein: the elastic member has a rigidity-reducing portion for reducing a rigidity of the elastic member; and the elastic member has
a first contact portion being in contact with the first diaphragm;a second contact portion being in contact with the second diaphragm; anda first connecting portion connecting the first contact portion and the second contact portion as the rigidity-reducing portion.