Abstract: A relief valve includes a valving element, a movable holder, a housing having a guide hole and a valve seat, and a resilient member. The valving element is lifted from its seated state, in which the valving element is engaged with the valve seat, toward a pressurizing chamber in a lift period. The lift period includes a lift first period and a lift second period. An amount of the lift of the valving element reaches a set distance in the lift first period. The lift second period is after the amount of the lift of the valving element has reached the set distance. The movable holder slides inside the guide hole both in the lift first period and in the lift second period. A minimum clearance area between the movable holder and the guide hole is larger in the lift second period than in the lift first period.

Abstract: A fuel chamber defined by a recess portion of a valve body and a tip section of a valve member of an injector is structured such that a seat diameter Ds of a seat section of the valve member seated on a valve seat section formed on an inner peripheral surface of the valve body, an axial distance A between an inlet portion of an injection hole formed in the recess portion and the tip section of the valve member facing the inlet portion in the fuel chamber and an axial distance B between an inside region of the recess portion located radially inside the inlet portion of the injection hole in the fuel chamber and the tip section facing the inside region satisfy inequalities: 0.048?A/Ds?0.18 and B/Ds?0.18.

Abstract: A fuel injection valve includes a housing, a stator, a movable core, a coil, a nozzle hole, a valve member, and at least one communicating passage. The housing receives the stator and movable core. An end face of the movable core has a non-contact surface and a contact surface. The non-contact surface and the stator define a space when the contact surface contacts the stator. The valve member is slidably received in a bore of the movable core. The valve member has a stopper engageable with the movable core such that the valve member is axially movable together with the movable core. The at least one communicating passage connects the space with a corresponding one of a first fuel passage and a second fuel passage of the housing.

Abstract: A fuel injector has a plurality of fuel injection ports including first injection ports and second injection ports. Injection-port axes of the first injection ports extend to a first space in a combustion chamber. Injection-port axes of the second injection ports extend to a second space in a combustion chamber. An interval of the injection-port axes between adjacent first injection ports is shorter than an interval of the injection-port axes between the first injection port and the second injection port which are adjacent to each other.

Abstract: In a fluid injection valve, a valve needle and a moving core are installed in the valve housing to be slidable in an axial direction. The moving core has a through hole in which the valve needle is slidably inserted. A stopper provided on the valve needle moves the valve needle integrally with the moving core when the moving core travels toward the fixed core with respect to the needle valve. An elastic member biases the valve needle away from the fixed core, and a helical spring biases the moving core toward the fixed core. A spring seat supports one axial end of the helical spring in both of the axial direction and a radial direction of the helical spring.

Abstract: A fuel chamber defined by a recess portion of a valve body and a tip section of a valve member of an injector is structured such that a seat diameter Ds of a seat section of the valve member seated on a valve seat section formed on an inner peripheral surface of the valve body, an axial distance A between an inlet portion of an injection hole formed in the recess portion and the tip section of the valve member facing the inlet portion in the fuel chamber and an axial distance B between an inside region of the recess portion located radially inside the inlet portion of the injection hole in the fuel chamber and the tip section facing the inside region satisfy inequalities: 0.048?A/Ds?0.18 and B/Ds?0.18.

Abstract: A fuel injection valve includes a housing, a stator, a movable core, a coil, a nozzle hole, a valve member, and at least one communicating passage. The housing receives the stator and movable core. An end face of the movable core has a non-contact surface and a contact surface. The non-contact surface and the stator define a space when the contact surface contacts the stator. The valve member is slidably received in a bore of the movable core. The valve member has a stopper engageable with the movable core such that the valve member is axially movable together with the movable core. The at least one communicating passage connects the space with a corresponding one of a first fuel passage and a second fuel passage of the housing.

Abstract: A microcomputer calculates a fuel injection time. When the fuel injection time is longer than a predetermined specified time, the microcomputer sets a voltage level of a short-term injection signal to high and sets a peak current for coils in fuel injectors to a first peak current. When the fuel injection time is shorter than or equal to the predetermined specified time, the microcomputer sets a voltage level of the short-term injection signal to low and sets a peak current for the coils to a second peak current smaller than the first peak current.

Abstract: A fuel injector is disclosed that includes a valve body with a plurality of nozzle holes for injecting fuel in a hollow spray from the fuel injector. The plurality of nozzle holes each include an outlet. The valve body also includes at least one air-introducing aperture with an air outlet port positioned between the outlets of the plurality of nozzle holes. The air-introducing aperture is operable for introducing air into a hollow area of the hollow spray.

Abstract: In a fluid injection valve, a valve needle and a moving core are installed in the valve housing to be slidable in an axial direction. The moving core has a through hole in which the valve needle is slidably inserted. A stopper provided on the valve needle moves the valve needle integrally with the moving core when the moving core travels toward the fixed core with respect to the needle valve. An elastic member biases the valve needle away from the fixed core, and a helical spring biases the moving core toward the fixed core. A spring seat supports one axial end of the helical spring in both of the axial direction and a radial direction of the helical spring.

Abstract: A fuel injector is disclosed that includes a valve body with a plurality of nozzle holes for injecting fuel in a hollow spray from the fuel injector. The plurality of nozzle holes each include an outlet. The valve body also includes at least one air-introducing aperture with an air outlet port positioned between the outlets of the plurality of nozzle holes. The air-introducing aperture is operable for introducing air into a hollow area of the hollow spray.

Abstract: A fuel injection valve includes a valve member, a first stop member, a second stop member, a movable core, a fixed core, and a coil. The valve member opens and closes an injection nozzle. The first stop member protrudes radially outward from said valve member. The second stop member protrudes radially outward from said valve member. The movable core is sandwiched between said first and second stop members. The movable core and one of said first and second stop members defines a fuel chamber. The fixed core is axially displaced from said movable core. The coil causes reciprocal axial displacement of said valve member such that said movable core axially reciprocates toward and away from said fixed core therewith.

Abstract: In a fuel injection valve, a valve member is reciprocable in a longitudinal direction of the valve member to open and close an injection hole. The movable core is reciprocable together with the valve member. The fixed core faces an opposite side of the movable core opposite from the injection hole. The spring applies a force to the valve member in one of reciprocable directions of the valve member. The coil generates a magnetic force to the fixed core when energized such that the fixed core attracts the movable core against the force. The force adjusting member is inserted into the fixed core with a clearance therebetween, wherein the force adjusting member is engaged with the spring. The support member is disposed on an opposite side of the fixed core opposite from the movable core, wherein the force adjusting member is press fitted in the support member.

Abstract: A fuel injection valve includes a substantially cylindrical housing that at least partially surrounds an outer periphery of a coil. The housing is formed of a magnetic material. A fixed core and a movable core are located on a radially inner side of the coil. The movable core is opposed to the fixed core. The movable core is attracted to the fixed core by magnetic attractive force generated between the movable core and the fixed core. A valve is axially movable together with the movable core. A holder is formed of a magnetic material separately from the housing. The holder connects with a first axial end of the housing. The holder accommodates the valve. A cap is formed of a magnetic material separately from both the housing and the holder. The cap connects with a second axial end of the housing.

Abstract: A fuel injection valve comprises a body, a valve member, a coil, a movable core, a fixed core, and a housing member. The body has a nozzle hole. The valve member allows injection of fuel from the nozzle hole. The coil generates a magnetic field. The movable core axially reciprocates with the valve member. The fixed core is provided adjacent to a side of the movable core that is opposite the nozzle hole. The fixed core attracts the movable core and moves with the valve member due to the magnetic field generated from the coil. The housing member has a first axial end fixed to the body. The housing member covers the coil and forms a magnetic circuit together with the body, the movable core, and the fixed core due to the magnetic field generated by the coil.

Abstract: A fuel injection valve includes a valve body, a nozzle plate, and a weld portion. The valve body includes an axial end portion that has an opening and an inner periphery connecting with each other. The inner periphery is a substantially conical surface defining a valve seat. The nozzle plate is provided to the axial end portion of the valve body. The valve body and the nozzle plate define a boundary portion therebetween. The nozzle plate has a plurality of nozzle holes, through which an end surface of the nozzle plate on a side of the opening of the valve body communicates with an end surface of the nozzle plate on a side opposite to the valve body. The weld portion connects the valve body with the nozzle plate. The weld portion extends from an outer circumferential periphery of the boundary portion to an inner side in a radial direction of the valve body.

Abstract: A fuel injection valve includes a valve member, a first stop member, a second stop member, a movable core, a fixed core, and a coil. The valve member opens and closes an injection nozzle. The first stop member protrudes radially outward from said valve member. The second stop member protrudes radially outward from said valve member. The movable core is sandwiched between said first and second stop members. The movable core and one of said first and second stop members defines a fuel chamber. The fixed core is axially displaced from said movable core. The coil causes reciprocal axial displacement of said valve member such that said movable core axially reciprocates toward and away from said fixed core therewith.

Abstract: A fuel injection valve comprises a body, a valve member, a coil, a movable core, a fixed core, and a housing member. The body has a nozzle hole. The valve member allows injection of fuel from the nozzle hole. The coil generates a magnetic field. The movable core axially reciprocates with the valve member. The fixed core is provided adjacent to a side of the movable core that is opposite the nozzle hole. The fixed core attracts the movable core and moves with the valve member due to the magnetic field generated from the coil. The housing member has a first axial end fixed to the body. The housing member covers the coil and forms a magnetic circuit together with the body, the movable core, and the fixed core due to the magnetic field generated by the coil.

Abstract: In a structure or method of installing an injector in a delivery pipe of a common rail, the injector on which a seal member and a clip member are mounted is inserted into an interior of the delivery pipe in such a manner that the clip member comes in contact with the delivery pipe after the seal member comes in contact with an interior wall of the delivery pipe. This structure or method has an advantage of preventing the foreign material, which is a part of the protection layer peeled off from the delivery pipe due to contact between the clip member and the delivery pipe, from being lodged between the seal member and the inner wall of the delivery pipe.

Abstract: In a structure or method of installing an injector in a delivery pipe of a common rail, the injector on which a seal memberandaclipmemberaremounted is inserted into an interior of the delivery pipe in such a manner that the clip member comes in contact with the delivery pipe after the seal member comes in contact with an interior wall of the delivery pipe. This structure or method has an advantage of preventing the foreign material, which is a part of the protection layer peeled off from the delivery pipe due to contact between the clip member and the delivery pipe, from being lodged between the seal member and the inner wall of the delivery pipe.