摘要:
A mechanical part comprises a sliding section and a sleeve section which are prepared separately. The sliding section is made of a wear resisting material such as ceramics and formed with a planar sliding surface at one of the sides thereof. The sliding section is further formed with a joining portion at the outer periphery thereof. The sleeve section is made of metal and formed with a joining portion at the inner periphery thereof. The joining portions of the sliding section and the sleeve section are joined by interference fit or the like, whereby to allow the sliding surface of the sleeve section to be formed into a crowned shape.
摘要:
A ceramic-steel joined body includes a ceramic body of silicon nitride, zirconia, silicon carbide, boron nitride, and alumina. The joined body also includes a steel body which has its surface carburized so that the hardness of the surface is greater than the hardness of the inside of the steel body. The ceramic body and the steel body are thermally joined using a brazing material of Ag--Cu--Ti, Ag--Cu--In--Ti, Ag--Ti, Cu--Ti, Ag--Cu--Ni--Ti, Ag--Cu or Ag--Cu--In.
摘要:
A body, like a rocker arm, is disclosed which comprises a base body fabricated of a Ni-Cr-Mo type steel which contains less than 8 wt % Cr; and a ceramic tip soldered to a given portion of the base body. The soldering is so made as to increase the hardness of the base body.
摘要:
A rocker arm comprises an arm section extending throughout the overall length thereof. The arm section is made of ceramics and adapted to engage a cam, valve stem and a lash adjuster.
摘要:
A tappet for an internal combustion engine consists of a tappet main body and a ceramic seat plate brazed to the tappet main body. The tappet main body is made up of a first part made of low carbon steel and a second part made of metal. In manufacture, the first and second parts are first welded together to constitute the tappet main body, and then the ceramic seat is brazed to the tappet main body. The low carbon steel forming the first part of the tappet main body has such a property that when carburized it can be hardened by making use of the heat for the brazing, and the metal forming the second part of the tappet main body has such a property that it can be hardened by making use of the heat for the brazing.
摘要:
A tappet for an internal combustion engine comprises a tappet main body and a ceramic seat plate. The tappet main body is constituted by axially separated first and second parts which are made of different metallic materials. The first part is for installation in a hole of a cylinder block for sliding therein. The second part is for installation between a push rod and a cam. The metallic material for the second part is more wear-resistant than that of the first part. The ceramic seat plate is brazed to the second part, and the first and second parts are joined together by welding such as electron beam welding, laser beam welding, etc.
摘要:
A failure determination apparatus for a vehicle includes: a failure determination element configured to determine that failure occurs at the vehicle when a state with failure detection continues for a first period, and to determine that the failure is resolved when a state without the failure detection continues for a second period; a notification element configured to notify failure information to an external device when the failure determination element determines that the failure occurs at the vehicle; a repair completion detection element configured to detect completion of repair of the vehicle with respect to the failure; and a short-cut element configured to shorten the second period when the repair completion detection element detects the completion of repair of the vehicle.
摘要:
As a method of promoting natural HDR and curing disc herniation an apparatus is provided for shortening the time period of HDR, by ultrasonic irradiation. The apparatus is equipped with at least one ultrasonic transducer, an ultrasonic oscillator and mount means for mounting the ultrasonic transducer to an bone joint site, and is means for irradiating ultrasonic waves of 1.3 to 2 MHz in frequency, 100 to 1,000 Hz in repetition frequency, 10 to 2000 μs in burst width and 100 mW/cm2 or less in power (SATA: Spatial Average-Temporal Average).
摘要翻译:作为促进天然HDR和固化椎间盘突出症的方法,提供了一种通过超声波照射来缩短HDR的时间周期的装置。 该装置配备有至少一个超声波换能器,超声波振荡器和用于将超声换能器安装到骨接合部位的安装装置,并且是用于以重复频率照射频率为1.3至2MHz的超声波,频率为100至1,000Hz的装置 ,突发宽度为10〜2000声道,功率为100mW / cm 2以下(SATA:空间平均 - 时间平均)。
摘要:
A silicon nitride sintered material containing a silicon nitride component and silicon carbide having an average particle size of 1 μm or less in an amount of at least 1 mass % and less than 4 mass %, based on 100 mass % of the silicon nitride component. The carbide is dispersed in the silicon nitride component, and the silicon nitride sintered material has a thermal expansion coefficient of at least 3.7 ppm/° C. between room temperature and 1,000° C. The silicon nitride component contains a rare earth element in an amount of 15-25 mass % as reduced to a certain oxide thereof and Cr in an amount of 5-10 mass % as reduced to a certain oxide thereof, and a crystalline phase is present in intergrain regions of the sintered material.
摘要:
A silicon nitride—tungsten carbide composite sintered and process for preparing the same which contains silicon nitride and tungsten carbide, and is characterized in that the total in amounts of an entirety of rare earth elements as reduced to certain corresponding oxides thereof, the elements being contained in the sintered material, and excess oxygen as reduced to silicon dioxide is 6-20 mass %; the ratio, on a mol basis, of (the amounts of rare earth elements as reduced to the certain corresponding oxides thereof)/(the amounts of the rare earth elements as reduced to the corresponding oxides thereof+the amount of excess oxygen as reduced to silicon dioxide) is 0.3-0.7; a crystalline phase is present in an intergrain region of the sintered material; and an effective firing temperature range within which a flexural strength of at least 800 MPa is obtained encompasses at least 100 degrees. Also disclosed is a glow plug having a ceramic heater comprising the silicon nitride—tungsten carbide composite sintered material.