Abstract: A first fuel inlet, a second fuel inlet, a first fuel outlet, and a second fuel outlet of a valve assembly of a high-pressure fuel pump are formed radially outside an aperture portion of a fuel pressurization chamber.

Abstract: In a high-pressure fuel pump, a back-pressure chamber connected to a high-pressure fuel discharge passage is formed in a casing facing a central portion of a first plate.

Abstract: A variable delivery fuel supply device capable of obtaining a stable fuel pressure even in a case of inoperability of an electromagnetic valve and capable of improving the durability of the electromagnetic valve, which comprises fuel injection valves 1a through 1d for injecting fuel to respective cylinders of an internal combustion engine, a delivery pipe 2 connected with the fuel injection valves 1a through 1d, a fuel pump 3 which sucks fuel from a fuel intake valve into a pressurizing chamber 23 by a reciprocating action of a plunger 21 in a cylinder 20 and supplies the pressurized fuel into the delivery pipe 2 through a discharge valve 31, an electromagnetic valve 32 located in a relief passage 35 communicating the pressurizing chamber 23 of the fuel pump 32 with the fuel intake port 27 and is adapted to control a discharge quantity of the pressurized fuel by relieving the pressurized fuel in the pressurizing chamber 23 into the fuel intake port 27 at the time of opening the valve to thereby control a fuel

Abstract: In a high pressure fuel pumping apparatus 3, a drain passage 12 for fuel having leaked from the inside of a fuel sealing metallic bellows 26, and another drain passage 13 for a high pressure fuel regulator 8 for regulating the pressure discharged from the high pressure fuel pumping apparatus are merged at a merging point. A lead type of check valve 17 is located upstream in the drain passage 12 between the merging point 14 and the fuel sealing metallic bellows 26, and a ball type of check valve 18 is located downstream in the drain passage 12.

Abstract: A diaphragm stopper construction for a high-pressure accumulator 100 is provided which causes no damage when the diaphragm 86 deforms even if the fuel is contaminated by foreign matter and the foreign matter is caught in the slight gap 94 between the diaphragm 86 and the plate or wall 101 and deforms the diaphragm 86 as in the conventional design. The diaphragm 86 is supported and sealed by the case 85 and a plate 101, and has a secured portion 104 which is not displaced even if the pressure in the high-pressure chamber 71 fluctuates. In the gentle slope 103 of the plate 101, a rectangular groove 105 is disposed which has a rectangular cross-section and which is an annular recess portion formed around the circumference of the plate 101 in close proximity to and radially inside the innermost secured edge S of the secured portion 104, such that even if the diaphragm 86 is displaced and comes into contact with the gentle slope 103 of the plate 101, foreign matter can be received.

Abstract: The present invention relates to a high-pressure fuel pump assembly 200, which supplies high-pressure fuel from a fuel supply port 9 to a delivery pipe 1a, wherein the high-pressure fuel pump assembly 200 comprises: a high-pressure pump 20 having an intake valve 22 and a discharge valve 21; a fuel discharge passage 4 connecting the discharge valve 21 to the fuel supply port 9; and a high-pressure damper 60 disposed in the fuel discharge passage 4; and a first check valve 210, which opens when the pressure on the voluminous chamber side is a fixed value lower than the pressure on the discharge valve side, is provided within the fuel discharge passage 4 between the high-pressure damper 60 and the discharge valve 21. The first check valve may be a ball valve or a reed valve, and a second check valve may be provided between the fuel supply port 9 and the high-pressure damper 60.

Abstract: To improve the rigidity of diaphragms, a plurality of diaphragms of the same thickness and size are placed one upon another, the total thickness of the diaphragms is a value obtained by multiplying the thickness of the diaphragm by the number of diaphragms, and the peripheral portions of the diaphragms are sealed and supported by a high-pressure container.

Abstract: A cylinder injection high-pressure fuel pump permits reduction in size and cost thereof and it is also capable of securely absorbing high-frequency pulsations. The cylinder injection high-pressure fuel pump (200) has: a casing (1) in which an inlet passage (2) for taking fuel in and a discharge passage (35) for discharging the fuel are formed; a cylinder (30) formed in the casing (1); a fuel pressurizing chamber (32) formed in a part of the cylinder (30); and a plunger (31) disposed in the cylinder (30) such that it may reciprocate therein. As the plunger (31) reciprocates, the fuel is taken into the fuel pressurizing chamber (32) through the inlet passage (2) and pressurized therein, then the pressurized fuel is discharged through the discharge passage (35) and forcibly fed into a fuel injector of a cylinder injection type engine.

Abstract: A surge absorber assembly comprises a metal case provided with a recess, a metal diaphragm attached to the perimeter of the case to form a back pressure chamber in the recess being charged with high-pressure gas, and a metal plate attached so as to hold the diaphragm against the perimeter of the case to form a damper chamber facing the diaphragm, the case, the diaphragm, and the plate being joined by a weld formed by fusing the respective perimeters thereof, and a groove being formed in at least one of the case and the plate alongside the weld.

Abstract: A cylinder injection high-pressure fuel pump prevents the pulsations of fuel generated by a high-pressure fuel pump from spreading to a low-pressure pipe connected to a low pressure end. The cylinder injection high-pressure fuel pump has: a casing (1) in which an inlet passage (2) for taking fuel in and a discharge passage (35) for draining the fuel are formed; a cylinder (30) formed in the casing (1); a fuel pressurizing chamber (32) formed in a part of the cylinder (30); and a plunger (31) disposed in the cylinder (30) such that is may reciprocate therein. As the plunger (31) reciprocates, the fuel is taken into the fuel pressurizing chamber (32) through the inlet passage (2)and pressurized therein, then the pressurized fuel is discharged through the discharge passage (35) and forcibly fed into a fuel injector of a cylinder injection type engine. The inlet passage (2) is equipped with a check valve (70).

Abstract: A high-pressure accumulator is provided which protects a diaphragm from abnormal displacement. A high-pressure vessel 101 is provided with support portions 107, 108 having contact portions facing the vicinity of the central portion of a diaphragm 106. The support portions are annular and have the same center as that of the high-pressure chamber. The support portions may also have a plurality of holes. The support portions have curved surfaces 107a, 108a which make contact with the diaphragm uniformly when the diaphragm is displaced. In addition, the support portions may be either integrated with or separated from a case 101. A seal portion is disposed on the cylindrical outer wall 109a of a plate 109 disposed in a position on the opposite side of the diaphragm 106 from the case 101.

Abstract: A diaphragm stopper construction for a high-pressure accumulator is provided which prevents excessive concentrations of stress in a diaphragm.The curve of the contact surface of a stopper includes a first curve for the perimeter portion of a diaphragm 86 which is determined on the basis of a first equation expressing deflection when a disk secured around its circumference is subjected to a uniformly distributed load; and a second curve for the central portion which is determined on the basis of a second equation expressing large deflection when a disk secured around its circumference is subjected to a uniformly distributed load.

Abstract: A swash plate type axial piston pump of enhanced assemblability and high assembling efficiency, in which looseness between constituent members of the pump is suppressed to minimum. A valve plate (31) and a cylinder block (15) are inserted in a first housing section (1a) sequentially, and then a second housing section (1b) is installed on the cylinder block (15) around an outer periphery and fixedly secured to the first housing section (1a), wherein an annular resilient member (29), an annular supporting member (24) and an annular shoe holder (27) are inserted in the second housing section (1b) sequentially. A plurality of pistons (21) each having a shoe (25) connected pivotally at one end are inserted into the cylinders (13), respectively, of the cylinder block (15) through retaining holes (27a), respectively, formed in the annular shoe holder (27).

Abstract: An object of the present invention is to obtain a magnetic disk which has a high coercive force. It has a constitution in which, at first, a Cr under layer, a magnetic layer of a Co alloy, and a protective layer, a Zr layer for example, are formed in order on a substrate, and it is heat-processed at a temperature of higher than 250.degree. C. The Zr layer is changed to an oxide layer, etc. by the heating process and becomes a layer which functions as a protective layer, and on the other hand, a chemical compound of Zr and a non-magnetic element in the magnetic layer of a Co alloy, Cr for example, is not generated, so that the segregation of Cr into the crystalline grain boundaries of the magnetic layer of a Co alloy is more effectively expedited. Because of this, since magnetic interactions between the crystalline grains in the magnetic layer of a Co alloy are weakened, the disks having high coercive force can be obtained.

Abstract: A method of manufacturing a magnetic recording medium such as for a magnetic disc, in which a magnetic layer comprising a Co-based alloy is formed on a carbon substrate and a heat treatment is applied at a temperature of 250.degree. to 1450.degree. C. to improve the coercive force. Further, the squareness ratio is improved by applying the heat treatment under a magnetic field. Greater coercive force can be obtained by forming a Cr underlayer prior to the formation of the magnetic layer. Increased recording density of the magnetic recording medium can be realized by improving the coercive force and the squareness ratio in this way.

Abstract: Magnetic recording media, wherein a substrate of Al-Mg alloy prepared from aluminum metal at a purity of higher than 99.99% is surface finished by electrolytic abrasive polishing and a thin film layer of ferromagnetic material is formed thereover as a recording layer.The Al-Mg alloy is preferably prepared by rapid-cooling solidification.

Abstract: An apparatus for detecting position/variance of input light is disclosed which includes a photoelectric conversion device receiving input light constituted of a first resistive layer formed of a first photoelectric conversion material and a second resistive layer formed of a second photoelectric conversion material connected with the first resistive layer through a depletion layer or directly, wherein the first resistive layer is provided with uniform resistivity throughout its surface so that a linear output proportional to the average of the distances between one end of the photoelectric conversion device and positions of the input light is detected and the second resistive layer is provided with resistivity dependent upon the distance from its one end so that a quandratic ouput proportional to the average of the squares of the distances between one end of the photoelectric conversion device and positions of the input light is detected.