US 7,472,839 B2
	Fuel injector
Yoshihito Yasukawa, Hitachinaka (Japan); Noriyuki Maekawa, Kashiwa (Japan); Motoyuki Abe, Hitachinaka (Japan); Nobuaki Sekiya, Isesaki (Japan); and Masahiro Soma, Hitachi (Japan)
Assigned to Hitachi, Ltd., Tokyo (Japan)
Filed on Oct. 05, 2006, as Appl. No. 11/543,190.
Claims priority of application No. 2005-293797 (JP), filed on Oct. 06, 2005.
Prior Publication US 2007/0080239 A1, Apr. 12, 2007
Int. Cl. B05B 1/24 (2006.01); B05B 1/30 (2006.01); F02M 47/02 (2006.01)

U.S. Cl. 239—135  [239/128; 239/88; 239/533.12; 239/584]

10 Claims

1. A fuel injection valve comprising a casing including a hollow cylindrical part in which a fuel flows, a nozzle body arranged at a front end of the cylindrical part of the casing and including a valve seat, a hollow valve shaft in which the fuel flows and which has a base portion slidable in the cylindrical part of the casing and a shaft portion with a diameter smaller than a diameter of the base portion, a valve body arranged at a front end of the valve shaft to be moved by the valve shaft driven axially to contact with and be separated from the valve seat, a fuel outlet port opening on a shaft wall of the valve shaft, a cylindrical fuel path formed between the shaft portion of the valve shaft and an inner surface of the cylindrical part of the casing to communicate with the valve seat, a heater arranged at an outside of the fuel path on the casing, and a cylindrical partition member arranged between the shaft portion of the valve shaft and the inner surface of the cylindrical part of the casing and fixed to the casing, wherein the partition member including a large diameter part closing the fuel path formed at an upper area with respect to the fuel outlet port, a small diameter part having a diameter smaller than an inner diameter of the cylindrical part of the casing and arranged at a lower area with respect to the fuel outlet port, and a fuel inlet port arranged on the small diameter part to be aligned with the fuel outlet port.