High-pressure fuel pump and assembly structure of high-pressure pump

A high pressure pump comprising:

• a plunger;
• an intermediate member including a cylinder body for pressurizing fluid in a pressurizing chamber by reciprocating the plunger, wherein the cylinder body has a cylinder accommodating the plunger and the pressurizing chamber communicated with the cylinder;
• a first clamping member and a second clamping member arranged on two ends of the intermediate member, both the first clamping member and the second clamping member receiving a bending force;
• a valve mounted on the first clamping member, the valve selectively opening and closing the pressurizing chamber;
• a clamping bolt extending between the two clamping members to clamp the intermediate member with the two clamping members, a portion of the first clamping member clamped by the clamping bolt protruding laterally from a solid body of the first clamping member and having a lower rigidity than that of the solid body of the first clamping member, and a portion of the second clamping member clamped by the clamping bolt being a flange-shaped peripheral portion;
• and
• a coupling structure for coupling the high pressure pump to a supporting member with the second clamping member and a fastening bolt,
• wherein the supporting member is a cover accommodating a cam therein, wherein the cam drives the plunger;
• the second clamping member having a contact surface that contacts the cover;
• the fastening bolt applying a force in a direction so that the second clamping member moves closer to the cover from a side opposite to the contact surface of the second clamping member;
• and
• the fastening bolt being screwed in a screwing hole formed in the cover, wherein the screwing hole penetrates only partially, and not all the way through the cover.