Fluid pump and high-pressure fuel feed pump

A fluid pump comprising:

• a first member in which a concavity is formed,
• a second member, which defines a cylindrical body forming said concavity as a fluid pressurizing chamber,
• a plunger, supported in a hole extending, in the second member, from one cylindrical body end through the cylindrical body to an opposite cylindrical body end so as to reciprocate, which pressurizes the fluid in said fluid pressurizing chamber and which has an end arranged so as to move beyond an said cylindrical body end to protrude into the pressurizing chamber,
• a seal part formed at a pressure-contact location of said first and second members, provided in an outer portion of said second member and spaced from both the pressurizing chamber and ends of said second member, and
• a pressing mechanism by which said first and second members are pressed together so that the seal part delimits the pressurizing chamber.

A fluid pump comprising:

• a pump housing,
• a cylinder comprising a longitudinal bore extending from one cylinder end through the cylinder to an opposite cylinder end,
• a pressurizing element that pressurizes the fluid in a pressurizing chamber formed between said cylinder and said pump housing and that has an end arranged so as to move beyond said one cylinder end to protrude into the pressurizing chamber,
• a seal part formed at a pressure-contact location between said pump housing and said cylinder, which seals the pressurizing chamber formed between said cylinder and said pump housing, and
• a pressing mechanism by which said pump housing and said cylinder element are relatively pressed together to install them so that the seal part delimits the pressurizing chamber.

A fluid pump comprising:

• a pump housing in which a concavity is formed,
• a cylinder assembled with said pump housing, which forms said concavity as a fluid pressurizing chamber, and
• a plunger, supported by said cylinder to reciprocate in a bore extending from one cylinder end through the cylinder to an opposite cylinder end, which pressurizes fluid in said pressurizing chamber and which has an end arranged so as to move beyond said one end to protrude into the pressurizing chamber,
• wherein fuel inhaled into said pressurizing chamber by reciprocation of said plunger is pressurized and discharged from said pressurizing chamber,
• wherein said cylinder is pressed against said pump housing so that said pressurizing chamber is formed by a seal provided by metal contact between said pump housing and said cylinder, which metal contact delimits said pressurizing chamber, and said seal is provided in an outer periphery of said cylinder and spaced from a pressurizing chamber side of said cylinder, and
• wherein said plunger goes into and back from said pressurizing chamber.