Title:
改善された高圧ポンプ
Document Type and Number:
Japanese Patent JP4542294
Kind Code:
B2
Abstract:
A main unit pumps the transferred liquid actuated by an auxiliary unit for pumping a working liquid. The auxiliary unit comprises a piston provided with an axial drilling (bore) for circulating working liquid between a tank and a compression chamber. The piston further comprises a valve for closing the drilling, the valve housed in the drilling between two ends thereof in permanent communication with the tank and the compression chamber respectively. The valve opens when the pressure of the working liquid in the tank exceeds that of the working liquid in the compression chamber and closes in the opposite situation. The compression chamber is delimited by a flexible diaphragm for pumping transferred liquid. The diaphragm is constantly elastically returned to the first position by a diaphragm spring. For the pump to operate correctly, the stiffness of the spring that returns the diaphragm associated with the piston, is dimensioned so that this spring keeps the working liquid contained in the compression chamber at a raised pressure with respect to the working liquid contained in the reservoir, and does so as long as the diaphragm has not reached its first position in which the pumping chamber has its maximum volume. The diaphragm spring allows the diaphragm to return automatically to its first position, even when there is no liquid in the main pumping unit.
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| JPH07269441 | HIGH PRESSURE FUEL PUMP |
Inventors:
Robert, Jean-Marc
Application Number:
JP2001501763A
Publication Date:
September 08, 2010
Filing Date:
May 26, 2000
Export Citation:
Assignee:
Peugeot Citroen Otomobil Societe Anonym
Seamen's VOD Automotive
Seamen's VOD Automotive
International Classes:
F02M59/04; F04B53/10; F02M37/12; F02M59/12; F04B1/14; F04B11/00; F04B43/02; F04B43/067
Foreign References:
| US3884598 | ||||
| FR2161608A1 | ||||
| US5707219 | ||||
| US3612727 | ||||
| WO1997047883A1 |
Attorney, Agent or Firm:
Kazuo Shamoto
Shosuke Imai
Tadashi Masui
Yasushi Kobayashi
Hiroyuki Tomita
Fujihiro Kanda
Shosuke Imai
Tadashi Masui
Yasushi Kobayashi
Hiroyuki Tomita
Fujihiro Kanda