Patent ID: 8955550
Filing Date: 2015-02-17
Classification: F02M,F16L

Abstract:
1. A damper device disposed in a fluid passage of a high-pressure pump, the damper device comprising: a first diaphragm including a first damper part which is elastically deformable, and a first peripheral part having an annular shape around the first damper part; a second diaphragm including a second damper part and a second peripheral part having an annular shape around the second damper part and overlapping with the first peripheral part, a damper chamber being defined between the first damper part and the second damper part, the second damper part being elastically deformable together with the first damper part to increase or decrease a volume of the damper chamber according to a pressure of fluid in the fluid passage; a first support portion made of metal and having an annular shape located on an opposite side from the second peripheral part with respect to the first peripheral part; a second support portion made of metal and having an annular shape located on an opposite side from the first peripheral part with respect to the second peripheral part, the first peripheral part and the second peripheral part being supported between the first support portion and the second support portion, a first covering portion having a cylindrical shape to surround the first damper part and being joined to the first support portion; and a second covering portion having cylindrical shape to Surround the second damper part and being joined to the second support portion, wherein: radially outer sections of the first peripheral part the second peripheral part the first support portion, and the second support portion are integrally welded with each other to have a weld in common; and the first covering portion and the second covering portion are arranged in the fluid passage, and are directly supported by an inner wall of the fluid passage or indirectly supported through a support component.