US 7,520,449 B2
	Electromagnetic fuel injection valve
Daisuke Matsuo, Miyagi (Japan); Tomoyuki Omura, Miyagi (Japan); and Eisaku Sakata, Miyagi (Japan)
Assigned to Keihin Corporation, Tokyo (Japan)
Appl. No. 11/659,134 PCT Filed Sep. 22, 2005, PCT No. PCT/JP2005/017453 § 371(c)(1), (2), (4) Date Feb. 01, 2007, PCT Pub. No. WO2006/035657, PCT Pub. Date Apr. 06, 2006.
Claims priority of application No. 2004-280182 (JP), filed on Sep. 27, 2004.
Prior Publication US 2007/0251505 A1, Nov. 01, 2007
Int. Cl. F02M 51/06 (2006.01); F02M 51/00 (2006.01); F16K 31/02 (2006.01); B05B 1/30 (2006.01)

U.S. Cl. 239—585.5  [239/585.1; 239/585.4; 251/129.15; 251/129.21]

4 Claims

1. An electromagnetic fuel injection valve in which a cylindrical magnetic body (13) forming a part of a valve housing (9) having a valve seat (8) on a front end part thereof is joined, via a coaxial cylindrical non-magnetic body (25), to a front part of a cylindrical fixed core (23), a coil assembly (11) surrounding a rear part of the cylindrical magnetic body (13), the cylindrical non-magnetic body (25), and the fixed core (23) is housed within a solenoid housing (12) formed from a flange portion (23a) protruding radially outward from the rear end of the fixed core (23) and a coil case (31) that is formed in a cylindrical shape having an end wall (31a) at one end thereof and has opposite ends magnetically coupled to the cylindrical magnetic body (13) and the flange portion (23a), a fuel filter (33) is mounted on a rear part of an inlet tube (32) that is coaxially and integrally provided so as to be connected to the rear end of the fixed core (23) and that forms a fuel passage (34), and at least a front part of the inlet tube (32) and the solenoid housing (12) are covered by a synthetic resin-molded section (7) having an integral power-receiving coupler (40), a power-receiving connecting terminal (38) connected to a coil (29) of the coil assembly (11) facing the power-receiving coupler (40), characterized in that the resin-molded section (7) comprises a first resin-molded layer (41) and a second resin-molded layer (42), the first resin-molded layer (41) being formed from a glass fiber-incorporated synthetic resin while forming a coupler main portion (40a) that defines a framework part of the power-receiving coupler (40), and the second resin-molded layer (42) being formed from a synthetic resin into which glass fiber is not incorporated so as to cover the first resin-molded layer (41), and in a section of the inlet tube (32) on the fixed core (23) side, when the thickness of the first resin-molded layer (41) is t1, the thickness of the second resin-molded layer (42) is t2, and the thickness of the inlet tube (32) is t3, they are set so that t1<t3≤t2.