摘要:
A ceramic-metallic interfacing joint assembly is disclosed. The joint assembly includes a pair of interfaced components in a highly loaded, sliding contact in which the contact stresses can be as high as 250,000 psi. Preferably, the pair of interfaced components includes a ball member and a complementarily shaped, mating socket member and is used in a diesel type internal combustion engine. One of the components is formed of a ceramic material having a density of at least 3.18 g/cm.sup.3 and the other component is formed of a metallic material. Preferably, the density of the ceramic material ranges from 3.18 g/cm.sup.3 to 3.25 g/cm.sup.3. This arrangement reduces the wear of the joint assembly in conjunction with the use of a lubricant which lubricates the components. Specifically, the metallic material is an iron based material while the ceramic material is a sintered silicon nitride. The ceramic material may be sintered with rare-earth metal oxides such as yttrium oxide. Alternately, the ceramic material may be sintered using aluminum oxides.
摘要翻译:公开了一种陶瓷 - 金属接口组件。 接头组件包括在高负载滑动接触中的一对接口部件,接触应力可高达250,000psi。 优选地,一对接口部件包括球形构件和互补形状的配合插座构件,并且用于柴油型内燃机中。 其中一个部件由密度为至少3.18g / cm 3的陶瓷材料形成,另一个部件由金属材料形成。 优选地,陶瓷材料的密度范围为3.18g / cm 3至3.25g / cm 3。 这种布置结合使用润滑剂的润滑剂来减少接头组件的磨损。 具体地,金属材料是铁基材料,而陶瓷材料是烧结氮化硅。 陶瓷材料可以用稀土金属氧化物如氧化钇烧结。 或者,可以使用氧化铝烧结陶瓷材料。
摘要:
A ceramic link element suitable for use as a component in the drive train of an internal combustion engine is provided. The link includes a central shaft portion with opposed spherical terminal ends that contact correspondingly configured elements in the drive train. The ceramic link element is formed, preferably by injection molding, to be substantially free from flaws and to have maximum pore diameters, preferably a maximum pore diameter of 150 um or less on the shaft and 40 um or less on the spherical terminal ends, to produce a link with optimum mechanical strength. When these pore dimensions are met and the degree of sphericity of the spherical terminal ends is 20 um or less, the ceramic link exhibits increased mechanical strength, durability and reliability. A method of forming a ceramic link having the aforementioned characteristics is also provided.
摘要:
A low inertia, wear-resistant needle valve assembly is provided for an internal combustion engine closed nozzle unit fuel injector. The needle valve assembly includes a needle and spring retainer subassembly made from an advanced structural ceramic, such as silicon nitride. A valve seat subassembly in the injector cup is made from a combination of metal and ceramic. The assembly materials and configuration provide maximum control over the efficiency of the injection event so that the fuel injection event can be terminated quickly, thereby allowing more effective control over exhaust emissions.
摘要:
A wear and scuff-resistant plunger for use in high pressure fuel system components in internal combustion engines is provided. The plunger, which is formed of a high thermal expansion, high hardness ceramic with a thermal expansion coefficient preferably greater than 6.times.10.sup.-6 /.degree. C. and a hardness preferably greater than 800 Kg/mM.sup.2, maintains a desired optimum minimal diametral clearance while avoiding excessive fuel leakage and efficient plunger function without scuffing or sticking under the high axial, side and pressure loads and variable quality fuels encountered in the fuel system operating environment. Preferred high thermal expansion, high hardness ceramics are zirconia, alumina-zirconia and alumina.
摘要:
A wear and scuff-resistant timing plunger for a timing assembly in a unit fuel injector for an internal combustion engine is provided. The timing plunger is formed of a high thermal expansion ceramic with a thermal expansion coefficient greater than 6.times.10.sup.-6 /.degree. C. and a hardness greater than 800 Kg/mm.sup.2, which maintains a desired diametral clearance and efficient plunger function without scuffing or sticking under the axial, tangential and pressure loads encountered in the fuel injector operating environment. Preferred high thermal expansion ceramics are zirconia, alumina-zirconia and alumina.
摘要:
A pre-catalyst device configured to be disposed upstream of a main aftertreatment device of an engine exhaust system. An oxidizing material is disposed on an inlet face of the pre-catalyst device, where the oxidizing material is configured to oxidize engine exhaust before the engine exhaust reaches the main aftertreatment device of the engine exhaust system.
摘要:
An exhaust aftertreatment filter and method is provided for filtering engine exhaust, and reduces the maximum temperature experienced by the filter including during regeneration including during burn-off of trapped contaminant particulate including carbon oxidation combustion.
摘要:
An apparatus, system, and method are disclosed for detecting cracking in a particulate filter. The method may include providing an apparatus comprising an aftertreatment device with a substrate and a substrate surface, a conductive material forming a conduction path bonded to the surface of the substrate surface, and access points configured to allow a resistance measurement of the conduction path. The method may include measuring the resistance of the conduction path, and determining if one or more cracks have occurred on the substrate surface based on the resistance measurement. The method may further include labeling the degradation level of the aftertreatment device based on the indicated amount of cracking, and replacing the aftertreatment device with an equivalent aftertreatment device, based on the degradation level, after a service event.
摘要:
A lube oil and fuel blending system, pumping device and method are provided which effectively, inexpensively and controllably removes used lube oil from an engine and delivers the lube oil to the fuel system for consumption within the engine. The lube oil and fuel blending system includes a fuel pumping device or injector containing a bore and a plunger reciprocally mounted in the bore for movement through a retraction stroke and an advancement stroke, each having a predetermined stroke length. A fuel drain circuit communicates with the bore at a drain location spaced a predetermined seal length axially along the bore from an outer opening of the bore through which the plunger extends. The predetermined seal length is specifically designed less than the predetermined stroke length to cause lube oil on the outer portion of the plunger to be delivered by the plunger to the fuel drain circuit at the drain location. Fuel leakage through the fuel drain circuit washes the lube oil from the plunger thereby blending the lube oil and fuel and delivering the blend to the fuel supply system via a return line. A variable restriction valve may be provided in the return line to control the leakage flow. Therefore, the predetermined seal length can be chosen relative to the stroke to achieve a desired leakage rate. In another embodiment, an undercut may be used to increase the used lube oil leakage rate.
摘要:
This disclosure relates a water pump, a system for cooling internal combustion engine components including a water pump, and a method for operating an internal combustion engine including a water pump. The water pump, system and method provide protection of the pump impeller during dry pump operation, such as when a watercraft engine is started while the watercraft is out of water, by dispensing fluid from a reservoir to the pump's impeller chamber. The fluid enters the chamber via a controllable flow path and interacts with the impeller and chamber walls to cool and lubricate the impeller.