High-pressure fuel pump

A high-pressure fuel pump, comprising:

• a pump body which is formed with a pressing chamber;
• and
• a cylinder which is inserted in a hole formed in the pump body, wherein
• the cylinder is swaged to the hole by pressing a convex portion on an outside in a radial direction to fit into the hole on side distal to the pressing chamber, by screwing a formed screw thread into the hole, or by being swaged with the side distal to the pressing chamber,
• the cylinder is formed with a clearance in the radial direction with respect to the hole of the pump body all over a region from the convex portion to an end of the pump body adjacent to the pressing chamber, and
• the clearance is formed to be 0.025 mm or more.

A high-pressure fuel pump, comprising:

• a pump body which is formed with a pressing chamber;
• and
• a cylinder which is inserted in a hole formed in the pump body, wherein
• the cylinder is swaged to the hole by pressing a convex portion on an outside in a radial direction to fit into the hole on side distal to the pressing chamber, by screwing a formed screw thread into the hole, or by being swaged with the side distal to the pressing chamber,
• the cylinder is formed with a clearance in the radial direction with respect to the hole of the pump body all over a region from the convex portion to an end of the pump body adjacent to the pressing chamber, and
• the clearance has an even thickness in the radial direction, and the convex portion is formed to protrude outside in the radial direction by 0.0165 mm or more from an outermost diameter portion of the clearance in a lower portion of the clearance.