HIGH-PRESSURE FUEL SUPPLY PUMP AND ITS MANUFACTURING METHOD

• Main Authors: HOSOKAWA KAZUTAKA, MUNAKATA AKIHIRO, MACHIMURA HIDENORI
• Format: Patent
• Language: English
• Published: 21.05.2009
• Subjects: BLASTING; CLADDING OR PLATING BY SOLDERING OR WELDING; COMBUSTION ENGINES; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; SOLDERING OR UNSOLDERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TRANSPORTING; WEAPONS; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a joining structure and a method without causing a composition change in a metallic material by heat, by sufficiently providing joining strength and fluid sealability in a short time at joining work by staking (press-fitting included), screw-fastening and laser welding, as the joining structure of two metallic parts fitted by a cylindrical part in a high pressure fuel supply pump. SOLUTION: While an electric current is supplied to any one of the welding connection surfaces formed between a pump housing and a cylinder in the high pressure fuel supply pump, between the pump housing and an installation flange, between the pump housing and a suction or delivery joint, between the pump housing and a damper cover of a pulsation absorbing damper mechanism, between the pump housing and a relief valve mechanism, and between the pump housing and an electromagnetically driven intake valve mechanism, the particular two sections are pressed against each other to generate, along the connection surface, a plastic flow not causing melting due to heat, and form a diffusion-weld region at the connection surface by using the plasstic flow and the relative application of the pressure. COPYRIGHT: (C)2009,JPO&INPIT