摘要:
A valve seat, press-fitted into a cylinder head of an internal combustion engine, containing an iron-based sintered alloy, includes a valve-seating section and a head-seating section. The valve-seating section and the head-seating section are monolithically formed by a sintering process and form a double layer structure. The valve-seating section includes a first iron-based sintered alloy member that has a porosity of 10 to 25 percent by volume and a sintered density of 6.1 to 7.1 g/cm3 and contains hard particles dispersed in a matrix. The head-seating section includes a second iron-based sintered alloy member that has a porosity of 10 to 20 percent by volume and a sintered density of 6.4 to 7.1 g/cm3.
摘要翻译:包含铁基烧结合金的压入内燃机气缸盖的阀座包括阀座部和头座部。 阀座部分和头座部分通过烧结工艺整体地形成并形成双层结构。 阀座部分包括具有10至25体积%的孔隙率和6.1至7.1g / cm 3的烧结密度的第一铁基烧结合金构件,并且包含分散在 一个矩阵。 头座部分包括具有10至20体积%的孔隙率和6.4至7.1g / cm 3的烧结密度的第二铁基烧结合金构件。
摘要:
A valve seat made of an iron base sintered alloy for internal combustion engines comprises of hard particles of hardness 700-1300 Hv dispersed by 3-20% by volume in a matrix phase comprising comprising of a 5-40% psarlite phase, a 20-60% fine carbide dispersed phase, and a 5-20% high alloy diffusd phase. The hard paricles are preferably selected from a group of Mo--Ni--Cr--Si--Co intermetallic compound particles, Cr--Mo--Co intermetallic compound particles, and Fe--Mo alloy particles. The iron base sinteed alloy is conpised of, by weight, C: 0.2-2.0%, Cr: 1.0-9.0%, Mo: 1.0-9.0%, Si: 0.1-1.0%, W: 1.0-50%, V: 0.2-3.0%, one or more Cu, Co and Ni of 0.5-10.0% in total, and the remainder substantial Fe.
摘要:
An iron-based sintered alloy material for a valve seat having improved wear resistance and reduced opposite aggressibility to a mating valve. The iron-based sintered alloy material contains 10% to 20% by area of first hard particles and 15% to 35% by area of second hard particles dispersed in a base matrix phase, the first and the second hard particles accounting for 25% to 55% by area in total. The first hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 μm and a hardness of at least 500HV0.1 and less than 800HV0.1. The second hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 μm and a hardness of at least 800HV0.1 and less than 1100HV0.1. Solid lubricant particles may also be dispersed in the base matrix phase.
摘要:
An iron-based sintered alloy material for a valve seat having improved wear resistance and reduced opposite aggressibility to a mating valve. The iron-based sintered alloy material contains 10% to 20% by area of first hard particles and 15% to 35% by area of second hard particles dispersed in a base matrix phase, the first and the second hard particles accounting for 25% to 55% by area in total. The first hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 μm and a hardness of at least 500HV0.1 and less than 800HV0.1. The second hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 μm and a hardness of at least 800HV0.1 and less than 1100HV0.1. Solid lubricant particles may also be dispersed in the base matrix phase.
摘要:
Provided is a joint which can decrease the number of kinds of parts. A bolt 5 has a shaft portion 14 which is constituted of a distal end portion on which male threads 14a are formed and a remaining portion 14b on which male threads are not formed. First and second joint members 2, 3 have the same shape. A shaft insertion hole 15 which is disposed on an abutting end surface side of the joint member and a threaded hole 16 which is communicated with the shaft insertion hole 15 and extends to an end surface of the joint member on a side opposite to an abutting end surface of the joint member are formed in the first and second joint members 2, 3.
摘要:
Disclosed is a composite sheet 1 composed of a substantially flat lower fibrous sheet 3 and an upper fibrous sheet 2 bonded to the lower fibrous sheet 3. The upper fibrous sheet 2 is three-dimensionally textured with a number of projections 5 and a number of depression 6 each of which is located between every adjacent two of the projections 5. The projections 5 and the depressions 6 alternate in both a first direction of the composite sheet 1 and a second direction perpendicular to the first direction. Each projection 5 has a pair of opposing first walls 51 parallel to the first direction and a pair of opposing second walls 52 parallel to the second direction. The basis weight of the first walls 51 is different from that of the second walls 52.
摘要:
There is provided an oscillator using a high-frequency crystal resonator which can satisfy the drive level needed for the crystal resonator and expand a variable frequency range. An oscillator having an oscillation circuit CC for oscillating the resonator SS is provided with a limiter circuit LM1 as a load of the resonator SS which is inductive and is a load circuit for limiting an oscillation amplitude. According to this configuration, the action of the limiter circuit LM1 allows satisfaction of the drive level needed for the crystal resonator and expansion of the variable frequency range.
摘要:
This photodiode array 10 includes quenching resistors 7 which are connected in series to respective avalanche photodiodes APDs, a peripheral wiring WL which surrounds a region in which the plurality of avalanche photodiodes APDs are formed, and a plurality of relay wirings 8 which are electrically connected to the peripheral wiring WL, so as to respectively connect at least two places of the peripheral wiring WL. One of an anode and a cathode of each avalanche photodiode APD is electrically connected to any one of the relay wirings 8 via the quenching resistor 7, and the other of the anode and the cathode of each avalanche photodiode APD is electrically connected to another electrode 6 provided on a semiconductor substrate.
摘要:
An apparatus for an exhaust gas system includes a main exhaust passage, a main catalytic converter disposed in the main exhaust passage, a bypass exhaust passage, a bypass catalytic converter disposed in the bypass exhaust passage, and a valve configured to open or close a section of the main exhaust passage. The bypass exhaust passage bypasses the main exhaust passage between a branch point of the bypass exhaust passage out of the main exhaust passage and a junction with the main exhaust passage at a upstream side of the main catalytic converter. A first sensor indicates a first air-fuel ratio of exhaust gas in the bypass exhaust passage. A second sensor indicates a second air-fuel ratio of exhaust gas flowing into the main catalytic converter. A controller determines whether the valve in the closed configuration leaks exhaust gas based on the first and second air-fuel ratios of exhaust gas.