To provide a robust high-pressure fuel pump having high lubricity in a slidably fitting part between a cylinder and a plunger, in order to solve the following problem: fluid is likely to reside particularly in a lower part (a low-pressure fuel chamber side end) of the cylinder that generates large heat in the slidably fitting parts between the cylinder and the plunger.
The cylinder and a pump body are formed of different members. The plunger has a stepped part that is located on an outer periphery opposite to a pressure chamber and has a smaller diameter than a part slidably fitted with the cylinder. The volume of a low-pressure fuel chamber is increased or decreased by the stepped part of the plunger that is reciprocated in the low-pressure fuel chamber. A fuel flows between the inside of the low-pressure fuel chamber and a low-pressure fuel passage, and the fuel flow cools the cylinder directly or indirectly.
YAMADA HIROYUKI
SUGANAMI MASAYUKI
TAKAHASHI SUNAO
ONOSE TORU
HIMOTO TORU
USUI SATOSHI
| JP2008002361A | 2008-01-10 | |||
| JP2008025425A | 2008-02-07 | |||
| JP2007064076A | 2007-03-15 | |||
| JPH08210227A | 1996-08-20 | |||
| JPH10159680A | 1998-06-16 | |||
| JP2003049743A | 2003-02-21 |
| WO2000047888A1 | 2000-08-17 | |||
| WO2002055881A1 | 2002-07-18 |
Yuji Toda
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