Fuel injection valve

Abstract

Abstract PURPOSE:To aim at an increase in a valve opening lift value and a improvement in responsiveness, by constituting a valve so as to cause the opening or closing a nozzle needle to be triggered by an electrostriction type actuator, while making aixiliary force act on an end face at the side of the electrostriction type actuator of a pump piston. CONSTITUTION:When fuel injection should be started, if some negative voltage is impressed on an electrostriction type actuator 2 and a voltage of about 500V so far impressed on the said actuator 2 is released instead, the actuator 2 becomes contracted. With this constitution, a pump piston 12 is pushed up till force being pushed upward from the side of a pump chamber 28 and another force being pushed downward from the side of a back pressure chamber 40 are well balance, so that pressure in th pump chamber 28 is reduced as far as a portion for each sectional area ratio of both chambers 28 and 40. As a result, a needle 3 is pushed upward by dint of fuel pressure in an oil sump 23, and the fuel inside the oil sump 23 is spouted out of a nozzle hole 26. This fuel injection aforesaid is stopped when a voltage of about 500V is impressed on the electrostriction actuator 2.

Inventors

• 👤 Toshihiko Ito
• 👤 猪頭　敏彦
• 👤 Yasuyuki Sakakibara
• 👤 榊原　康行
• 👤 Toru Yoshinaga
• 👤 融 吉永
• 👤 Masayuki Abe
• 👤 誠幸 阿部
• 👤 Kazuhide Watanabe
• 👤 和英 渡辺

Bibliographic Details