Abstract: In an electromagnetic fuel injection valve in which a valve assembly formed by integrally connecting a valve element and a movable core to each other is contained in a valve housing, and a first journal part and a second journal part are provided in the valve assembly so as to be supported slidably in the guide hole in a valve housing, the outside surface of the first journal part (21) is formed by a sliding surface (45) slidable on the inside surface of the guide hole (14) and a pair of tapered tilt surfaces (46, 47) connecting to both the front and rear sides of the sliding surface (45); at least the tilt surface (47) on the movable core side, of both the tilt surfaces (46, 47), is formed of a first tilt surface part (47a) connecting to an end part of the sliding surface (45) and a second tilt surface part (47b) connecting to the first tilt surface part (47a); and an angle that the first tilt surface part (47a) makes with a plane perpendicular to the axis line of a valve shaft part (19b) is set larger than

Abstract: A process for producing an electromagnetic fuel injection valve is provided, the electromagnetic fuel injection valve having a structure in which a valve assembly formed by coaxially joining a movable core and a valve body is spring-biased toward the side on which the valve assembly is seated on a valve seat while restricting an end thereof that is in proximity to a fixed core, and in the process a first distance (L1) between the front end of the fixed core (22) and the front end of a cylindrical magnetic body (9) is measured, a stopper (28) and the movable core (18) are formed so that a second distance (L2) between an annular shoulder portion (10c) of a valve seat member (10) and the rear end of the stopper (28) projecting by a predetermined amount from the rear end of the movable core (18) in a state in which the valve seat member (10) and the valve assembly (17) are held coaxially is smaller than the first distance (L1) by a desired value, and the cylindrical magnetic body (9) and the valve seat member (10

Abstract: A fuel injection valve is provided in which a funnel-shaped fuel collecting depression (35) is provided between a valve seat (8) and an outlet hole (7) of a valve seat member (3), the depression (35) collecting fuel that has passed through the valve seat (8) and guiding it to the outlet hole (7), and a flat fuel diffusion chamber (36) for radially outwardly diffusing fuel that has passed through the outlet hole (7) and guiding it to a plurality of fuel injection holes (11) is provided between opposing faces of the valve seat member (3) and an injector plate (10), an inner peripheral face (7A) of the outlet hole (7) being formed along a curved face on the inner peripheral side of a virtual torus (T) so that the inner peripheral face (7A) is continuous with the base of the fuel collecting depression (35) and the roof of the fuel diffusion chamber (36).

Abstract: In an electromagnetic fuel injection valve in which a rear end of a magnetic cylindrical body is coaxially connected to a front portion of a cylindrical fixed core via a non-magnetic cylindrical body, and a coil assembly formed by winding a coil around a bobbin is disposed to surround a rear portion of the magnetic cylindrical body and the fixed core, the bobbin 28 integrally includes: a cylindrical portion; a pair of flange portions 28b and 28c which protrude radially outward from opposite ends of the cylindrical portion; and a terminal boss portion 36 which protrudes sideway from one 28b of the flange portions 28b and 28c that is disposed at a side opposite from the magnetic cylindrical body and to which a pair of power-receiving-side connecting terminals 38 are fixed; and engagement recesses 46 are respectively formed to be recessed inward on opposite sides of a portion of the terminal boss portion 36 connected to the one flange portion 28b so that intermediate portions of a pair of coil ends 29a extending

Abstract: In an electromagnetic fuel injection valve in which a coil assembly is housed in a solenoid housing including a cylindrical magnetic metal coil case which integrally has, at one end side, a ring-shaped end wall portion and a press-fit cylindrical portion integrally connected to an inner periphery of the end wall portion so that the magnetic cylindrical body is press-fitted to the press-fit cylindrical portion and the press-fit cylindrical portion is welded to the magnetic cylindrical body, and a flange portion which is provided at a rear end of a fixed core; and at least the solenoid housing is covered with a resin molded part made of a synthetic resin and integrally having a power receiving coupler, the coil case 31 is formed by a burring process to a central portion of a closed end of a bottomed cylindrical material 45 having a circular opening 46 with a smaller diameter than an outer diameter of the press-fit cylindrical portion.

Abstract: An electromagnetic fuel injection valve (I) is provided that includes a fixed core (5) made of a high hardness ferrite magnetic material, and a movable core (12) that has fixed thereto by press-fitting a stopper element (14) that is nonmagnetic or is more weakly magnetic than the movable core (12), the stopper element (14) abutting directly against the fixed core (5) so as to maintain an air gap (g) between the two cores (5) and (12) when a coil (30) is energized. In this way, high abrasion resistance and responsiveness can be imparted to the fixed core and the movable core without subjecting the two cores to a troublesome abrasion resistance treatment to provide a plating layer, etc., and without providing a valve body stopper plate, thereby contributing to a reduction in the cost of the electromagnetic fuel injection valve.

Abstract: An electromagnetic fuel injection valve (I) is provided that includes a fixed core (5) made of a high hardness ferrite magnetic material, and a movable core (12) that has fixed thereto by press-fitting a stopper element (14) that is nonmagnetic or is more weakly magnetic than the movable core (12), the stopper element (14) abutting directly against the fixed core (5) so as to maintain an air gap (g) between the two cores (5) and (12) when a coil (30) is energized. In this way, high abrasion resistance and responsiveness can be imparted to the fixed core and the movable core without subjecting the two cores to a troublesome abrasion resistance treatment to provide a plating layer, etc., and without providing a valve body stopper plate, thereby contributing to a reduction in the cost of the electromagnetic fuel injection valve.

Abstract: In a fuel injection valve in which a funnel-shaped fuel collecting recess 35 is provided between a valve seat 8 and an outlet hole 7, and a flat fuel diffusion chamber 36 which diffuses a fuel radially outward and guides the fuel to a plurality of fuel injection holes 11 is provided between opposed surfaces of a valve seat member 3 and an injector plate 10, a seating portion 16a having aspherical band shape, and a valve tip end portion 16b which projects into a cone shape toward a center of the outlet hole 7 from the seating portion 16a and leaves its top portion in the outlet hole 7 even at the time of valve opening of a valve body 18 are formed at the valve body 18, a cone angle ? of the valve tip end portion 16b is set to be larger than a funnel angle ? of the fuel collecting recess 35, and an inner peripheral surface 7A of the outlet hole 7 is formed along an inner peripheral side curved surface of a virtual torus T so that the inner peripheral surface is connected to a bottom surface of the fuel collecti

Abstract: To prevent a fuel liquid surface within a float chamber from rising when a liquid surface change occurs to make a float rotate so that a float valve opens a valve seat hole, a first float (F3) is arranged in one outer side from one end (F4) of the bearing portion (F1) and in one side (B), one end (F4) of the bearing portion (F1) and the first float (F3) are connected by a first connecting arm portion (F6), a second float (F7) is arranged in another outer side from another end (F8) of the bearing portion (F1) and in one side (B), another end (F8) of the bearing portion (F1) and the second float (F7) are connected by a second connecting arm portion (F19), a first buffer rib (F12) is integrally formed between an outer side surface (F6A) of the first connecting arm portion (F6) and another side surface (F5) of the first float (F5), and a second buffer rib (F13) is integrally formed between an outer side surface (FIOA) of the second connecting arm portion (F10) and another side surface (F9) of the second float (F7

Abstract: To prevent a fuel liquid surface within a float chamber from being rised when a liquid surface change occurs to make a float rotate so that a float valve opens a valve seat hole, a first float (F3) is arranged in one outer side from one end (F4) of the bearing portion (F1) and in one side (B), one end (F4) of the bearing portion (F1) and the first float (F3) are connected by a first connecting arm portion (F6), a second float (F7) is arranged in another outer side from another end (F8) of the bearing portion (F1) and in one side (B), another end (F8) of the bearing portion (F1) and the second float (F7) are connected by a second connecting arm portion (F19), a first buffer rib (F12) is integrally formed between an outer side surface (F6A) of the first connecting arm portion (F6) and another side surface (F5) of the first float (F5), and a second buffer rib (F13) is integrally formed between an outer side surface (F10A) of the second connecting arm portion (F10) and another side surface (F9) of the second floa