High pressure fuel injection unit for internal combustion engine.

摘要

A high pressure fuel injection unit (10) for internal combustion engines is provided with an injection amount control means for controlling the fuel injection amount in such a manner that the higher the fuel pressure, the ratio of the increment of the fuel injection amount per injection cycle to the increment of the fuel pressure within a so-called accumulator chamber (38), becomes larger. The injection amount control means according to the invention can be realised by making smaller the set load of an urging spring (36) which urges an injection valve body (26) installed within said accumulator chamber (38) to the closing side as the fuel pressure becomes higher.