Abstract: A rotation angle detector includes: a magnet attached to a rotating shaft and magnetized in a certain direction orthogonal to an axis of the rotating shaft; and a non-rotary magneto-electric transducer placed to be opposed to an end surface of the magnet, and configured to detect a rotation angle of the rotating shaft in cooperation with the magnet through magneto-electric transduction. A concave curved surface is formed in the end surface of the magnet in order to make a magnetic flux of a magnetic field facing the end surface of the magnet closer to the magnet and flattened. Accordingly, it is possible to provide a rotation angle detector which is compact in size and has a stable accuracy for detecting the rotation angle, by making the curvature of the magnetic flux near the end surface of the magnet small and placing the magneto-electric transducer in that location.

Abstract: A carburetor comprises an intake path, a constant volume fuel chamber and a fuel nozzle. The intake path is connected to an intake port of an engine, and is opened and closed by a throttle valve. The constant volume fuel chamber is provided below the intake path, constantly stores a certain amount of fuel, and has an upper space connected to an air vent. An upper end of the fuel nozzle opens to the intake path to spray fuel of the constant volume fuel chamber to the intake path. The fuel nozzle is connected to a fuel passage communicating to the underneath of a fuel level of the constant volume fuel chamber, and a fuel pump which feeds fuel to the fuel nozzle is interposed in the fuel passage.

Abstract: A rotation angle detector includes: a magnet attached to a rotating shaft and magnetized in a certain direction orthogonal to an axis of the rotating shaft; and a non-rotary magneto-electric transducer placed to be opposed to an end surface of the magnet, and configured to detect a rotation angle of the rotating shaft in cooperation with the magnet through magneto-electric transduction. A concave curved surface is formed in the end surface of the magnet in order to make a magnetic flux of a magnetic field facing the end surface of the magnet closer to the magnet and flattened. Accordingly, it is possible to provide a rotation angle detector which is compact in size and has a stable accuracy for detecting the rotation angle, by making the curvature of the magnetic flux near the end surface of the magnet small and placing the magneto-electric transducer in that location.

Abstract: A fuel injection valve is provided which includes a valve seat member (3) having a valve seat (8) and a nozzle (10) that is provided so as to be connected to a front end part of the valve seat member (3) so as to be positioned on the downstream side of the valve seat (8) and has a plurality of fuel discharge holes (11b) arranged around an axis (A) of the valve seat member (3), wherein the angle formed between the center line (Lb) of each of the fuel discharge holes (11b) and an inner end face (10a) of the nozzle (10) is set at an obtuse angle (?) on the side closer to the outer periphery of the nozzle (10) with respect to the center line (Lb) and an acute angle (?) on the side closer to the center of the nozzle (10) with respect to the center line (Lb), and fuel injected from a fuel discharge hole (10b) produces a fuel spray form (fb) as a fuel film having an arc-shaped cross section with a convex face facing the nozzle outer periphery side.

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: An electromagnetic fuel injection valve is provided in which a cylindrical magnetic body is welded to a valve seat member having at the rear end thereof a tubular press-fit portion press-fitted into a front portion of the cylindrical magnetic body, a valve body is housed in the valve seat member while being spring-biased in a direction that seats the valve body on a valve seat, and a movable core facing a fixed core is coaxially connected to the valve body, wherein the valve seat member (10) includes the tubular press-fit portion (10a), a large diameter portion (10b) that has substantially the same outer diameter as the outer diameter of the cylindrical magnetic body (9), and an annular shoulder portion (10c) that is formed as a flat face perpendicular to the outer peripheral face of the tubular press-fit portion (10a) and provides a connection between the tubular press-fit portion (10a) and the large diameter portion (10b), an annular abutment receiving face (9a) at the front end of the cylindrical magnetic

Abstract: An electromagnetic fuel injection valve in which a first resin-molded layer that is made of a synthetic resin, covers a solenoid section, and forms a coupler main portion that defines a coupler is covered by a second resin-molded layer different from that of the first resin-molded layer so that an outer face of the coupler main portion is exposed from a middle part up to the extremity of the coupler main portion. An endless engagement groove is provided on the outer periphery of the middle pad of the coupler main portion of the first resin-molded layer, the second resin-molded layer engaging with the endless engagement groove. An extending portion extending further outward than the engagement groove is formed in the second resin-molded layer so that the extending portion makes contact with an outer face of the coupler main portion when in a non-engaged state and covers the coupler main portion.

Abstract: In an electromagnetic fuel injection valve designed so that the contact of a movable attraction face at a rear end of a movable core with a stationary attraction face included at a front end of a stationary core is inhibited, a ring-shaped stopper (28) made of a material non-magnetic or magnetic weakly more than a movable core (18) is press-fitted into an inner periphery of a rear portion of the movable core (18), and a flat abutment face (51), which is disposed at a location displaced from a flat movable attraction face (41) formed at the rear end of the movable core (18) toward a stationary attraction face (42), is formed at a rear end of the stopper (28) to be able to abut against the stationary attraction face. A slant (52) is formed on an inner periphery of the rear end of the movable core (18) and an outer periphery of the rear end of the stopper (28) to continuously and smoothly connect the movable attraction face (41) and the abutment face (51) to each other.

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: In an electromagnetic fuel injection valve in which a non-magnetic cylinder is coaxially coupled at its front end to a rear end of a magnetic cylinder forming a portion of a valve housing to surround a portion of a movable core having a rear end face serving as a movable attraction face, and a stationary core having a front end face serving as a stationary attraction face is fitted and fixed at its front portion in a rear portion of the non-magnetic cylinder, so that the stationary attraction face is opposed to the movable attraction face, the stationary core (22) is fitted and fixed at its front portion in the non-magnetic cylinder (26), so that it is in close contact with an inner surface of an intermediate portion of the non-magnetic cylinder (26) in a region corresponding to the stationary attraction face (42), and an annular recess (44) having a flat portion (44a) flush connected to the stationary attraction face (42) is provided in an inner surface of the non-magnetic cylinder (26) to form an annular ch

Abstract: An electromagnetic fuel injection valve having a cylindrical magnetic body, the front end of a cylindrical non-magnetic body surrounding a part of a movable core coaxially connected to a valve body is connected coaxially to the rear end of the cylindrical magnetic body, and a fixed core is fitted into and fixed to a rear portion of the cylindrical non-magnetic body, wherein the movable core includes a tubular sliding portion having an outer peripheral face that is in sliding contact with an inner peripheral face of a rear portion of the cylindrical magnetic body, a rear tubular opposing portion, and a front tubular opposing portion, and when the diameter of the rear tubular opposing portion is D1, the diameter of the front tubular opposing portion is D2, and the diameter of the tubular sliding portion is D3, they are set so that D1<D2<D3.

Abstract: In an electromagnetic fuel injection valve in which a first resin-molded layer that is made of a synthetic resin, covers a solenoid section, and forms a coupler main portion that defines a framework of a power-receiving coupler is covered by a second resin-molded layer made of a synthetic resin that is different from that of the first resin-molded layer so that an outer face of the coupler main portion is exposed from a middle part up to the extremity of the coupler main portion, an endless engagement groove (45) is provided on the outer periphery of the middle part of the coupler main portion (40a) of the first resin-molded layer (41), the second resin-molded layer (42) engaging with the endless engagement groove (45), and an extending portion (42b) extending further outward than the engagement groove (45) is formed in the second resin-molded layer (42) so that the extending portion (42b) makes contact with an outer face of the coupler main portion (40a) when in a non-engaged state and covers the coupler mai

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: An electromagnetic fuel injection valve is provided in which a valve body is housed in a valve housing having a cylindrical magnetic body, the front end of a cylindrical non-magnetic body surrounding a part of a movable core coaxially connected to the valve body is connected coaxially to the rear end of the cylindrical magnetic body, and a fixed core is fitted into and fixed to a rear portion of the cylindrical non-magnetic body, wherein the movable core (18) includes a tubular sliding portion (18a) having an outer peripheral face that is in sliding contact with an inner peripheral face of a rear portion of the cylindrical magnetic body, a rear tubular opposing portion (18b) that is connected coaxially and integrally to the rear end of the tubular sliding portion (18a) and has the outer periphery thereof facing the inner periphery of the cylindrical magnetic body (9), and a front tubular opposing portion (18c) that has the outer periphery thereof facing the inner periphery of the cylindrical magnetic body (9)

Abstract: An electromagnetic fuel injection valve is provided in which a cylindrical magnetic body is welded to a valve seat member having at the rear end thereof a tubular press-fit portion press-fitted into a front portion of the cylindrical magnetic body, a valve body is housed in the valve seat member while being spring-biased in a direction that seats the valve body on a valve seat, and a movable core facing a fixed core is coaxially connected to the valve body, wherein the valve seat member (10) includes the tubular press-fit portion (10a), a large diameter portion (10b) that has substantially the same outer diameter as the outer diameter of the cylindrical magnetic body (9), and an annular shoulder portion (10c) that is formed as a flat face perpendicular to the outer peripheral face of the tubular press-fit portion (10a) and provides a connection between the tubular press-fit portion (10a) and the large diameter portion (10b), an annular abutment receiving face (9a) at the front end of the cylindrical magnetic

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 a spherical 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 collect

Abstract: In an electromagnetic fuel injection valve designed so that the contact of a movable attraction face at a rear end of a movable core with a stationary attraction face included at a front end of a stationary core is inhibited, a ring-shaped stopper (28) made of a material non-magnetic or magnetic weakly more than a movable core (18) is press-fitted into an inner periphery of a rear portion of the movable core (18), and a flat abutment face (51), which is disposed at a location displaced from a flat movable attraction face (41) formed at the rear end of the movable core (18) toward a stationary attraction face (42), is formed at a rear end of the stopper (28) to be able to abut against the stationary attraction face. A slant (52) is formed on an inner periphery of the rear end of the movable core (18) and an outer periphery of the rear end of the stopper (28) to continuously and smoothly connect the movable attraction face (41) and the abutment face (51) to each other.

Abstract: In an electromagnetic fuel injection valve in which a non-magnetic cylinder is coaxially coupled at its front end to a rear end of a magnetic cylinder forming a portion of a valve housing to surround a portion of a movable core having a rear end face serving as a movable attraction face, and a stationary core having a front end face serving as a stationary attraction face is fitted and fixed at its front portion in a rear portion of the non-magnetic cylinder, so that the stationary attraction face is opposed to the movable attraction face, the stationary core (22) is fitted and fixed at its front portion in the non-magnetic cylinder (26), so that it is in close contact with an inner surface of an intermediate portion of the non-magnetic cylinder (26) in a region corresponding to the stationary attraction face (42), and an annular recess (44) having a flat portion (44a) flush connected to the stationary attraction face (42) is provided in an inner surface of the non-magnetic cylinder (26) to form an annular ch

Abstract: An electromagnetic fuel injection valve includes a coil assembly housed in a solenoid housing having 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. Wherein at least the solenoid housing is covered with a resin molded part and integrally has a power receiving coupler, the coil case being formed by a burring process to a central portion of a closed end of a bottomed cylindrical material having a circular opening with a smaller diameter than an outer diameter of the press-fit cylindrical portion.

Abstract: An electromagnetic fuel injection valve has a rear end of a magnetic body coaxially connected to a front portion of a fixed core via a non-magnetic body. A coil assembly surrounds a rear portion of the magnetic body and the fixed core. A bobbin includes a cylindrical portion; a pair of flanges protruding radially outward from opposite ends of the cylindrical portion; and a terminal boss portion protruding sideways from one of the flanges disposed at a side opposite from the magnetic body and to which a pair of power-receiving-side connecting terminals are fixed. Engagement recesses are recessed inward on opposite sides of the terminal boss portion connected to the one flange wherein intermediate portions of a pair of coil ends extending from opposite ends of a coil pass through and engage the engagement recesses and are electrodeposited to a pair of electrodeposition portions provided with the connecting terminals.