Abstract: The present invention provides a pressure relief valve, which achieves a reliable sealed structure in a valve holder 31 without the valve holder 31 jutting far out from a common rail, assures stability of operation of a valve spring 11 in a valve holder 31, and is capable of being manufactured at low cost and can be made compact.

Abstract: The present invention provides a pressure relief valve, which achieves a reliable sealed structure in a valve holder 31 without the valve holder 31 jutting far out from a common rail, assures stability of operation of a valve spring 11 in a valve holder 31, and is capable of being manufactured at low cost and can be made compact.

Abstract: The plunger pump according to the present invention discharges fuel by reciprocation of a plunger, and comprises metallic diaphragm type dampers, provided at a fuel inlet side and a fuel outlet side, respectively, for reducing pressure pulsation of fuel. Each metallic diaphragm type damper comprises a pressure chamber for receiving fuel pressure, a back pressure chamber into which gas is charged, and a metallic diaphragm for defining the pressure chamber and the back pressure chamber. Since the metallic diaphragm type dampers are provided at the fuel inlet side and the fuel outlet side, respectively, noise and vibration caused by pressure pulsation are reduced at the fuel inlet side and the fuel outlet side. Also, since the diaphragms are metallic diaphragms, deterioration thereof generated by fuel liquid and back pressure gas is low, reliability is high, and the lifetime is long.

Abstract: A diaphragm type damper has a combined member, which is formed by welding a marginal portion of a diaphragm to a half body having a concave portion formed therein, and is fixed to a pressure chamber portion to which high pressure fluid is introduced. A wall thickness of a welding portion of the half body is not relevant to welding, and the heat capacity of the welding portion is small. Since the half body is allowed to have a large wall thickness, leakage from the welding portion and damage to that portion can be prevented. In addition, the diaphragm type damper of this present invention can be easily assembled, since it requires only fixing the combined member to the pressure chamber portion.

Abstract: A communication path (32) for communicating a hermetically closed space (S) with an inlet port (20) is formed within a casing (1). An oil reservoir (30) having an inside capacity much greater than an inside capacity of the communication path (32) is formed in an intermediate part of the communication path (32).

Abstract: An externally threaded portion 31 of a valve body 10 is threadingly engaged with an internally threaded portion Hb formed on the opening portion side of an attachment hole Ha. A flange portion 32 of the valve body 10 is brought into abutment with an upper surface Hc of the housing H, so that the valve body 10 is fixed to the housing H. A lower end of the valve body 10 is located away from a bottom surface of the attachment hole Ha. A valve seat 23 and a guide hole 24 are formed inside the valve body 10. The valve seat 23 and the guide hole 24 are located on a lower side than the externally threaded portion 31. A valve element 50 is provided inside the valve body 10. This valve element 50 includes a seat portion 51 rest on the valve seat 23, and a guide portion 55 slidably engageable with the guide hole 24. A lower end opening portion of the guide hole 24 is shielded with a shielding plate 25. An orifice 25a is formed in the shielding plate 25.

Abstract: A pump for low-viscosity fuel comprises a pump shaft 6 installed in a pump housing 2, 3, 4 and divided into a drive-side shaft 6A and a driven-side shaft 6B, a partition 12 provided between the drive-side shaft and the driven-side shaft of the pump shaft to prevent leakage of fuel from the housing, and a magnetic coupling 13 for transferring torque from the drive-side shaft to the driven-side shaft of the pump shaft through the partition, the magnetic coupling being disposed such that a first clearance C1, D1 between the magnetic coupling and the partition is larger than a second clearance C2, D2 between the magnetic coupling and the pump housing. When wobble occurs in the pump shaft owing to wear of the sliding contact portions thereof, the magnetic coupling makes contact with the pump housing before contacting the partition, thereby enabling the rotation of the pump shaft to be stopped before fuel leakage occurs.

Abstract: A radial piston pump for low-viscosity fuel according to a first aspect of the invention comprises a pump housing, which is constituted of as few as two structural bodies (from among a drive-side housing member 2A, a fixed cylinder 81 and a cover 4), and a leaf valve member 82 which is formed with intake valves 87 for opening and closing intake side passages 27 and discharge valves 88 for opening and closing discharge side passages 28 and is sandwiched between two structural bodies (fixed cylinder 81 and cover 4). The first aspect of the invention reduces the number of components constituting the pump housing, enables highly precise overall axial alignment, prevents wobbling of a pump shaft 9 of the pump, increases performance and reliability and reduces cost.

Abstract: A fuel pump for a high-pressure fuel injection system includes a high-pressure fuel pump 4 for supplying high-pressure fuel to injectors 8 for injecting high-pressure fuel into cylinders of an engine, a pressure control valve 10 for controlling the fuel pressure of the high-pressure fuel pump 4, a high-pressure fuel supply pipe 16 connecting the high-pressure fuel pump 4 and the injectors 8, a high-pressure fuel control pipe 17 connecting the injectors 8 and the pressure control valve 10, and a pump-control valve communication passage 18 formed to communicate the high-pressure fuel pump 4 with the pressure control valve 10 and bypass the injectors 8, the sectional area of the pump-control valve communication passage 18 being smaller than those of the high-pressure fuel supply pipe 16 and the high-pressure fuel control pipe 17.

Abstract: A fuel pump for a high-pressure fuel injection system is constituted by integrating into a single pump unit 15 a high-pressure fuel pump 4 for supplying high-pressure fuel to injectors 8 for injecting high-pressure fuel into cylinders of an engine 16 and a solenoid valve unit 6 for controlling the fuel pressure of the high-pressure fuel pump 4, and the pump unit 15 is adapted for mounting on the engine. The configuration decreases required installation space, enables use of a common heat installation system and reduces the number of installation steps.

Abstract: A solenoid valve unit for a fuel injection apparatus suppresses fuel vaporization when the engine is being started or restarted when hot and enhances the reliability of engine operation by providing a stable fuel delivery during engine startup.

Abstract: Rotation speed of automotive auxiliary machines is controlled by a drive pulley provided on a crank shaft and a driven pulley communicating with the drive pulley through a V-belt. The drive pulley comprises a rigid pulley secured on a drive shaft, a guide holder to be rotated together with the drive shaft by a mount bolt, and a slide pulley axially-movably located between the guide holder and the rigid pulley. The slide pulley provides a power piston to be moved along a guide holder shaft. The power piston, the guide holder flange, and the slide pulley define a power piston chamber.Inside of the power piston chamber are located a flyweight to be moved by centrifugal force and a servo valve to be axially moved by the flyweight. The servo valve is fitted on the outer peripheral surface of the power piston.

Abstract: In a burglarproof system for an automotive vehicle, a door key cylinder arranged at a vehicle door includes a cylindrical body and a rotor accommodated therein. An acting section provided at the rotor extends radially from an axis thereof. A door key switch arranged in the vicinity of the door key cylinder detects the acting section to output a key-operation detection signal, when the rotor is angularly moved by turning operation of a key to bring a door locking mechanism to an unlocked position. A door lock switch detects in which one of the locked and unlocked positions the locking mechanism is. A stealing detector is provided for outputting a stealing detection signal when the stealing detector does not receive the key-operation detection signal from the door key switch, but receives the lock-releasing detection signal from the door lock switch. A burglarproof unit executes operation for a burglarproof in response to the stealing detection signal.

Abstract: A fuel injection control method for a fuel injection pump having a high pressure chamber in which fuel is pressurized, a low pressure chamber, a communicating passageway connected to the high pressure chamber and the low pressure chamber, and a solenoid valve for selectively opening and closing the communicating passageway. While fuel is pressurized, the solenoid valve is selectively closed and opened, so that the pilot injection and subsequently main injection are carried out. A starting time and a terminating time of pilot injection are determined depending on operating conditions of said engine, and main injection of fuel is started when a predetermined period of time elapses from the terminating time of the pilot injection.

Abstract: A solenoid valve unit for a fuel injection apparatus suppresses fuel vaporization when the engine is being started or restarted when hot and enhances the reliability of engine operation by providing a stable fuel delivery during engine startup.