Abstract: A delivery pipe is molded of resin and internally formed with a fuel passage. The delivery pipe has a shape of cross section including a single straight part, a single curved part, and joint parts at joints between ends of the straight part and the curved part. The joint part has an outer appearance protruding outward. The resin contains reinforcing glass fibers. A corresponding portion to a resin injection gate is located at an end region of the straight part in a longitudinal direction of the fuel passage.

Abstract: A fuel delivery pipe made of resin, comprises: a pipe body internally formed with a fuel passage; an inlet pipe for introducing fuel into the pipe body; a plurality of injector attaching parts for distributing the fuel introduced into the pipe body to a plurality of injectors through the fuel passage; and communication passages for communicating the fuel passage with the injector attaching parts, wherein the pipe body includes an absorbing part formed in a flat planar shape extending in a longitudinal direction of the pipe body, and the communication passages are placed so that respective centers are offset to the absorbing part side than a center of the pipe body.

Abstract: Inside an engine compartment of a vehicle, an ammonia concentration sensor is arranged above a liquid ammonia injector which is attached to an internal combustion engine body and to the rear in a direction of progression of the vehicle. An ammonia concentration which is detected by the ammonia concentration sensor is used as the basis to judge if ammonia is leaked.

Abstract: A fuel delivery pipe made of resin, comprises: a pipe body internally formed with a fuel passage; an inlet pipe for introducing fuel into the pipe body; and a plurality of injector attaching parts for distributing the fuel introduced into the pipe body to a plurality of injectors through the fuel passage, the inlet pipe having an internal diameter smaller than an internal diameter of the pipe body and being integrally formed at one end of the pipe body through a joint portion provided with a slant surface with a diameter gradually decreasing toward a root of the inlet pipe.

Abstract: A delivery pipe is molded of resin and internally formed with a fuel passage. The delivery pipe has a shape of cross section including a single straight part, a single curved part, and joint parts at joints between ends of the straight part and the curved part. The joint part has an outer appearance protruding outward. The resin contains reinforcing glass fibers. A corresponding portion to a resin injection gate is located at an end region of the straight part in a longitudinal direction of the fuel passage.

Abstract: A body 20 has body wall surfaces 21, 22 defining a body space inside. A core 30 is disposed within the body 20. The core 30 has a core wall surface defining a core space inside which has a bottom having an opening 33a. A valve 50 is inserted through the opening 33a of the core 30 with a clearance and can move along the core wall surface of the core 30. The valve 50 has a hole with a bottom which is comprised of holes 52a, 53a, 57a, a contact surface 58 that contacts the core wall surface of the core 30, a valve head 59 that can contact a valve seat 40, at least one first communication hole 55 that provides communication between the hole 53a and a second inflow fuel passage 30a within the core space, and at least one second communication hole 54 that provides communication between the hole 52a and the first inflow fuel passage 21a, 22a within the body space.

Abstract: A fuel injection valve is provided with a main body and a valve member. The main body has a fuel passage and a fuel injection opening formed at the downstream-end of the fuel passage. The valve member is provided in the fuel passage. The valve member is configured to move between a first position in which the valve member closes the fuel injection opening and a second position in which the valve member opens the fuel injection opening. The fuel injection valve is further provided with a compression spring disposed in the fuel passage and a spring pin. The compression spring restrains the valve member toward the first position. The spring pin is pressedly inserted into the fuel passage for keeping the compression spring in the fuel passage. A surface of the spring pin has a resistance against sulfur.

Abstract: A body 20 has body wall surfaces 21, 22 defining a body space inside. A core 30 is disposed within the body 20. The core 30 has a core wall surface defining a core space inside which has a bottom having an opening 33a. A valve 50 is inserted through the opening 33a of the core 30 with a clearance and can move along the core wall surface of the core 30. The valve 50 has a hole with a bottom which is comprised of holes 52a, 53a, 57a, a contact surface 58 that contacts the core wall surface of the core 30, a valve head 59 that can contact a valve seat 40, at least one first communication hole 55 that provides communication between the hole 53a and a second inflow fuel passage 30a within the core space, and at least one second communication hole 54 that provides communication between the hole 52a and the first inflow fuel passage 21a, 22a within the body space.

Abstract: An electromagnetic fuel injection valve wherein it is possible to prevent undesired adhesion between the respective abutting surfaces of an armature and a stationary core as well as to ensure the required wear resistance for the abutting surfaces and wherein the amount of lift of the valving element is unlikely to change is provided. After rough surfaces like satin-finished surfaces have been farmed on the abutting surfaces by shot peening, the rough surfaces are flattened by spotting. Therefore, the abutting surfaces can easily separate from each other without likelihood of adhering so closely that is difficult for them to separate from each other. Also, the amount of lift of the valving element is unlikely to change. Accordingly, the amount of fuel injected by the fuel injection valve is unlikely to change with passage of time. Thus, stable fuel supply can be performed.

Abstract: An electromagnetic fuel injection valve wherein a central pipe part has satisfactory mechanical strength and an intermediate portion of the pipe part is surely made non-magnetic is provided. The electromagnetic fuel injection valve has a core surrounded by a solenoid coil. A valve housing is disposed forward of the core. The core and the valve housing are connected through a thin-walled portion. The wall thickness of the thin-walled portion is smaller than the wall thickness of the core and that of the valve housing. The core and the thin-walled portion, together with the valve housing, are formed in an integral structure. The thin-walled portion has a sufficient wall thickness to provide satisfactory mechanical strength. The thin-walled portion is modified into a high-hardness non-magnetic portion by a carbulizing treatment.

Abstract: A low-cost and compact fuel injection valve that requires a minimum number of man-hours for production and that allows repair of a flaw or a pinhole in an insulating coating is provided. The fuel injection valve has an electromagnetic coil using an insulated coil wire covered with an insulating coating and having a fusion bonding layer with self-fusing properties coated over the insulating coating. Therefore, it is possible to dispense with the use of a bobbin and hence possible to provide a low-cost and compact fuel injection valve that requires a reduced number of man-hours for production. Further, a flaw or a pinhole in the insulating coating is repaired by self-fusion, and thus insulation properties and waterproofness are improved. Accordingly, it is possible to prevent disconnection of the coil due to electrolytic corrosion.

Abstract: An electromagnetic fuel injection valve wherein it is possible to prevent undesired adhesion between the respective abutting surfaces of an armature and a stationary core as well as to ensure the required wear resistance for the abutting surfaces and wherein the amount of lift of the valving element is unlikely to change is provided. After rough surfaces like satin-finished surfaces have been formed on the abutting surfaces by shot peening, the rough surfaces are flattened by spotting. Therefore, the abutting surfaces can easily separate from each other without likelihood of adhering so closely that it is difficult for them to separate from each other. In addition, because the tips of asperities of the rough surfaces are flattened by spotting, the tips of the asperities will not easily be worn away by repeated contact, and the amount of lift of the valving element is unlikely to change. Accordingly, the amount of fuel injected by the fuel injection valve is unlikely to change with passage of time.

Abstract: An electromagnetic fuel injection valve wherein a central pipe part has satisfactory mechanical strength and an intermediate portion of the pipe part is surely made non-magnetic is provided. The electromagnetic fuel injection valve has a core surrounded by a solenoid coil. A valve housing is disposed forward of the core. The core and the valve housing are connected through a thin-walled portion. The wall thickness of the thin-walled portion is smaller than the wall thickness of the core and that of the valve housing. The core and the thin-walled portion, together with the valve housing, are formed in an integral structure. The thin-walled portion has a sufficient wall thickness to provide satisfactory mechanical strength. The thin-walled portion is modified into a high-hardness non-magnetic portion by a carbulizing treatment.

Abstract: Injectors 105 (#1 to #3) are connected to a connector block body 130 and an external wiring connector 150 is formed on the connector block body 130. The external wiring connector 150 has external wiring independent connecting terminals 151 to 153 and an external wiring common connecting terminal 158. Wires are wound around wiring guides 158a, 161, 162, 165 to 170, 173, 174 and are hooked on wiring guides 163, 164, 171, 172, which wiring guides are provided in the connector block body 130. Wires 111 to 113 121 to 123 are installed without crossing each other between injector connecting terminals 101a, 102a, 103a, 101b, 102b, 103b of the injectors 105 and external wiring connecting terminals 151 to 153, 158.

Abstract: The invention is directed to an ignition coil for an internal combustion engine which includes a columnar member having a plurality of magnetic plates, e.g., silicon steel plates stacked one on the other with stacked portions formed on the magnetic plates. The magnetic columnar member includes a first portion having a plurality of magnetic plates stacked one on the other in accordance with increase of a width of each plate, a second portion connected to the first portion and having a plurality of magnetic plates with the same width stacked stacked one on the other, and a third portion connected to the second portion and having a plurality of magnetic plates stacked one on the other in accordance with decrease of a width of each plate, thereby to form the columnar member with a middle portion thereof having a substantially circular cross section.

Abstract: The invention is directed to an ignition coil for an internal combustion engine which includes a columnar member having a plurality of magnetic plates, e.g., silicon steel plates stacked one on the other, each of which is a flat plate with its opposite ends having a width greater than that of its middle portion. Each silicon steel plate has a middle portion whose width is gradually increased from the plates placed at the opposite sides of the columnar member to the plate placed in the center of the columnar member, to form a circular cross section. Whereas, the opposite end portions of the columnar member have a rectangular cross section which is greater in area than the circular cross section of the middle portion, respectively. A plurality of recesses are formed on one side of each steel plate, and a plurality of protrusions are formed on the other side of each steel plate.

Abstract: A motor-driven fuel pump including a brushless motor; a motor housing for enclosing the brushless motor; and a pump section adapted to be driven by the brushless motor for sucking a fuel and pumping the same into the motor housing.

Abstract: A fuel pump including a housing; a motor section provided in the housing which motor section includes an armature and a magnet opposed to the armature with a substantially annular space defined therebetween as a fuel passage, which armature includes a core formed by stacking a plurality of plates and a coil wound around the core; a pump section fixed to a lower end of the housing and connected to the motor section to be driven thereby; a fuel inlet formed in the pump section for sucking a fuel by driving the motor section; a fuel outlet formed at an upper end of the fuel pump for discharging the fuel fed from the fuel inlet through the fuel passage; and a first resin portion impregnated in the core and the coil for suppressing vibration of the armature. The fuel pump having the above construction preferably further includes a second resin portion coated on a surface of at least the first resin portion, which second resin portion has a resistance against the fuel and no influence upon the fuel.

Abstract: A multi-stage motor-driven fuel pump including a motor section provided with an electric motor and a pump section to be driven by the electric motor, the pump section having a plurality of pump chambers partitioned by intermediate plates and communicated with each other by a fuel communication hole formed through each of the intermediate plates. A ratio of a sectional area of the fuel communication hole of any one of the intermediate plates between adjacent ones of the pump chambers to a sectional area of the pump chamber on a lower pressure side is set in a predetermined range such that a gradient of fuel pressure increase in the pump section is increased to early prevent vapor lock.