Abstract: The present invention provides a fuel pump capable of preventing the occurrence of cavitation near a seat member in a valve mechanism. The fuel pump includes a plunger adapted to reciprocate, a pressurizing chamber adapted to increase and decrease its volumetric capacity through the reciprocation of the plunger, and a relief valve mechanism adapted to return a fuel to the pressurizing chamber. The relief valve mechanism includes a relief valve, and a seat member having a valve contact portion for seating the relief valve thereon. The relief valve is disposed closer to the plunger than the seat member. The seat member has an annular groove portion which forms a space communicating with the pressurizing chamber, between the annular groove portion and a second chamber (a fixing portion) surrounding the outer peripheral surface of the seat member. The space is provided at a position farther from the plunger than the valve contact portion.

Abstract: It is important not to form the partial bump in the collision structural part, however the fixed core and the movable core are relatively inclined due to an accumulation of tolerances and therefore even if each collision structural part of the fixed core and the movable core in formed in a flat shape, the fixed core and the movable core are contacted with not the whole of the collision structural parts but a part of the collision structural parts at the moment of the collision. In a case in which the collision structural part is formed in a ring shape or an intermittent ring shape, the fixed core and the movable core are contacted with each other at outer peripheral parts. Thus, when the fixed core and the movable core are collided with each other, a high stress is applied to the outer peripheral parts contacted first.

Abstract: A fuel injection valve is provided that can reduce variations in stroke length by reducing distortion during welding, and consequently can reduce variations in flow rate of injected fuel. The fuel injection valve has a nozzle; a fixed valve that is press-fit into a tip of the nozzle and has a fuel injection port from which the fuel is injected; and a movable element that forms a fuel seal section by abutting against the fixed valve, and opens and closes the fuel injection port. The fixed valve and the nozzle are fixed in place by welding at a position with no space due to press-fitting. A groove that serves as an empty space is provided in a continuation of a welded section that is formed in the fixed valve and the nozzle by the welding.

Abstract: In a fuel injection device having a sensor for detecting a state in the combustion chamber in a free end thereof, the noises that may be generated in the sensor signal transmitting member for transmitting the sensor signal are minimized. The fuel injection device comprises: a valve body (33) having a free end exposed to the combustion chamber (7) defined in the engine main body (3) and a base end located outside of the engine main body; a sensor (38) supported at a free end of the valve body to detect a state of the combustion chamber; an actuator (37) received in the valve body; a sensor signal transmitting member (91, 128) extending from the sensor to the base end of the valve body; a drive signal transmitting member (83, 84) extending from the actuator; and a first shield member (133) interposed between the sensor signal transmitting member and the drive signal transmitting member, the first shield member having an electro-conductive property and being grounded.

Abstract: It is important not to form the partial bump in the collision structural part, however the fixed core and the movable core are relatively inclined due to an accumulation of tolerances and therefore even if each collision structural part of the fixed core and the movable core in formed in a flat shape, the fixed core and the movable core are contacted with not the whole of the collision structural parts but a part of the collision structural parts at the moment of the collision. In a case in which the collision structural part is formed in a ring shape or an intermittent ring shape, the fixed core and the movable core are contacted with each other at outer peripheral parts. Thus, when the fixed core and the movable core are collided with each other, a high stress is applied to the outer peripheral parts contacted first.

Abstract: An object of the invention is to provide a fuel injection valve that applies a swirl to an upstream side of a seat section to shorten spray penetration. When flows into injection hole entries are indicated by arrows 101a to 106a and injection hole exit directions are indicated by arrows 201 to 206, an angle ? defined by the inflow direction 101a and the exit direction 201 of an injection hole 71 can be increased. In a method for applying the twisted angle ?, a side groove 15a on an outer peripheral side of a guide member 12a is set to be accompanied with a twist with respect to an axis O1. Furthermore, a flow passage area of the side groove 15a is set smaller than a flow passage area on an upstream side of the guide member 12a and is also set larger than a flow passage area of a seat section 7B that is constructed by a gap between a valve body 7 and an orifice cup 7.

Abstract: In a fuel injection device having a sensor for detecting a state in the combustion chamber in a free end thereof, the sensor signal transmitting member for transmitting the sensor signal is protected from vibrations and moisture. The fuel injection device comprises: a valve body (33) having a free end exposed to the combustion chamber (7) defined in the engine main body (3) and a base end located outside of the engine main body; a sensor (38) supported at the free end of the valve body to detect a state of the combustion chamber; a sensor signal transmitting member (91) extending from the sensor to the base end of the valve body along an exterior of the valve body to transmit a signal from the sensor; and a second resin portion (40) and/or a bonding agent (100) covering the sensor signal transmitting member and securing the sensor signal transmitting member onto an exterior of the valve body.

Abstract: In regard to a junction between a metal joint and an electromagnetic fuel injection valve, a screw structure or the like is used to secure the higher sealing property and strength than those of the conventional valve, and thus, the valve becomes larger in general than the conventional valve using an O-ring structure. In addition, there is an example in which resistance welding is used in order to provide a smaller size than the screw structure as another embodiment. In this case, it is necessary to increase a dimensional accuracy of a plane on which the resistance welding is performed in order to reduce a positional deviation or squareness between the metal joint and the electromagnetic fuel injection valve.

Abstract: A fuel injection valve that injects fuel directly into a cylinder of an internal combustion engine includes: a nozzle inserted into a fuel injection valve fitting hole formed in the cylinder; a cylindrical tip seal holder attached to the nozzle; and an annular seal member that is fitted to the tip seal holder and seals between an inner circumferential surface of the fuel injection valve fitting hole and an outer circumferential surface of the tip seal holder.

Abstract: An object of the invention is to provide a fuel injection valve that applies a swirl to an upstream side of a seat section to shorten spray penetration. When flows into injection hole entries are indicated by arrows 101a to 106a and injection hole exit directions are indicated by arrows 201 to 206, an angle ? defined by the inflow direction 101a and the exit direction 201 of an injection hole 71 can be increased. Ina method for applying the twisted angle ?, a side groove 15a on an outer peripheral side of a guide member 12a is set to be accompanied with a twist with respect to an axis O1. Furthermore, a flow passage area of the side groove 15a is set smaller than a flow passage area on an upstream side of the guide member 12a and is also set larger than a flow passage area of a seat section 7B that is constructed by a gap between a valve body 7 and an orifice cup 7.

Abstract: In a fuel injection device having a sensor for detecting a state in the combustion chamber in a free end thereof, the noises that may be generated in the sensor signal transmitting member for transmitting the sensor signal are minimized. The fuel injection device comprises: a valve body (33) having a free end exposed to the combustion chamber (7) defined in the engine main body (3) and a base end located outside of the engine main body; a sensor (38) supported at a free end of the valve body to detect a state of the combustion chamber; an actuator (37) received in the valve body; a sensor signal transmitting member (91, 128) extending from the sensor to the base end of the valve body; a drive signal transmitting member (83, 84) extending from the actuator; and a first shield member (133) interposed between the sensor signal transmitting member and the drive signal transmitting member, the first shield member having an electro-conductive property and being grounded.

Abstract: In a fuel injection device having a sensor for detecting a state in the combustion chamber in a free end thereof, the sensor signal transmitting member for transmitting the sensor signal is protected from vibrations and moisture. The fuel injection device comprises: a valve body (33) having a free end exposed to the combustion chamber (7) defined in the engine main body (3) and a base end located outside of the engine main body; a sensor (38) supported at the free end of the valve body to detect a state of the combustion chamber; a sensor signal transmitting member (91) extending from the sensor to the base end of the valve body along an exterior of the valve body to transmit a signal from the sensor; and a second resin portion (40) and/or a bonding agent (100) covering the sensor signal transmitting member and securing the sensor signal transmitting member onto an exterior of the valve body.

Abstract: A fuel injection valve that injects fuel directly into a cylinder of an internal combustion engine includes: a nozzle inserted into a fuel injection valve fitting hole formed in the cylinder; a cylindrical tip seal holder attached to the nozzle; and an annular seal member that is fitted to the tip seal holder and seals between an inner circumferential surface of the fuel injection valve fitting hole and an outer circumferential surface of the tip seal holder.

Abstract: In a fuel injection valve, it is intended to enhance valve-closing responsivity while maintaining durability (anti wear property) of a collision portion between a stationary core and a movable core and valve-opening responsivity. An annular end face 106A of the movable core 106 in the fuel injection valve is provided with a collision portion 106C that collides to a stationary core 107 when the movable core is magnetically attracted toward the stationary core side and a non-collision portion that keeps a fluid gap between both cores at an area of an outer side or an inner side from the collision portion. The annular end faces of the stationary core and the movable core are coated with platings 30, 31 having anti wear property, and at least one of the platings of the stationary core and the movable core is formed in such a manner that the thickness thereof at the collision portion 106C is to be thicker and the thickness thereof at the non-collision portion is to be thinner.

Abstract: A fuel injection valve is provided that can reduce variations in stroke length by reducing distortion during welding, and consequently can reduce variations in flow rate of injected fuel. The fuel injection valve has a nozzle; a fixed valve that is press-fit into a tip of the nozzle and has a fuel injection port from which the fuel is injected; and a movable element that forms a fuel seal section by abutting against the fixed valve, and opens and closes the fuel injection port. The fixed valve and the nozzle are fixed in place by welding at a position with no space due to press-fitting. A groove that serves as an empty space is provided in a continuation of a welded section that is formed in the fixed valve and the nozzle by the welding.

Abstract: Disclosed is an electromagnetic fuel injection valve capable of reducing dynamic flow variation relative to the pulse widths of individual units in a lower pulse region than under idling conditions under which the dynamic flow is adjusted. Also disclosed is an internal combustion engine control device that utilizes the electromagnetic fuel injection valve. The electromagnetic fuel injection valve includes a fixed core, a coil disposed at the periphery of the fixed core, an anchor facing the lower end of the fixed core, a movable element with a valve seat formed on its lower end, and a regulator press-fit into a through-hole in the fixed core, the fixed core being a central shaft of the electromagnetic fuel injection valve.

Abstract: In a fuel injection valve, it is intended to enhance valve-closing responsivity while maintaining durability (anti wear property) of a collision portion between a stationary core and a movable core and valve-opening responsivity. An annular end face 106A of the movable core 106 in the fuel injection valve is provided with a collision portion 106C that collides to a stationary core 107 when the movable core is magnetically attracted toward the stationary core side and a non-collision portion that keeps a fluid gap between both cores at an area of an outer side or an inner side from the collision portion. The annular end faces of the stationary core and the movable core are coated with platings 30, 31 having anti wear property, and at least one of the platings of the stationary core and the movable core is formed in such a manner that the thickness thereof at the collision portion 106C is to be thicker and the thickness thereof at the non-collision portion is to be thinner.