Patent application number | Description | Published |
20080205810 | Bearing apparatus for wheel - A bearing apparatus for wheel with ensured high durability by including a part with improved fatigue strength in a non-hardened portion includes an outer member, an inner member, and a roller. The inner member includes a hub ring made of steel and having a wheel attachment flange formed. The hub ring has a hardened portion hardened to attain at least 50 HRC as a result of quench hardening and a non-hardened portion which is a portion other than the hardened portion. Compressive stress in a range from at least 50 MPa to at most 500 MPa remains in the surface of the non-hardened portion. | 08-28-2008 |
20090016662 | Wheel support bearing assembly and manufacturing method thereof - A wheel support bearing assembly with a hub axle ( | 01-15-2009 |
20110081106 | MANUFACTURING METHOD OF THIN COMPONENT, BEARING RING, THRUST NEEDLE ROLLER BEARING, MANUFACTURING METHOD OF ROLLING BEARING RING, ROLLING BEARING RING, AND ROLLING BEARING - A manufacturing method of a thin component is characterized by heating a thin component, and thereafter, while sizing with molds and using molds as cooling media, performing one of quenching and isothermal transformation processes on thin component. Thus, a manufacturing method of a thin component without warping or deformation in heat treatment with even and high hardness, a bearing ring, a thrust needle roller bearing, a manufacturing method of a rolling bearing ring, a rolling bearing ring, and a rolling bearing can be obtained. | 04-07-2011 |
20120137523 | PROCESS FOR MANUFACTURING ROLLING CONTACT MEMBER, PROCESS FOR MANUFACTURING ROLLING BEARING, RACEWAY MEMBER OF ROLLING BEARING AND ROLLING BEARING - A process for manufacturing a rolling contact member comprises preparing a steel member consisting of a steel containing 0.7 mass % or more of carbon; performing hot forging of the steel member prepared in the steel member preparation step to thereby obtain a blank ring as the first forged member; performing turning of the blank ring obtained in the hot forging step to thereby remove part of the blank ring; and performing cold forging of the blank ring wrought in the first turning step to thereby obtain a stepped ring. In the steps subsequent to the cold forging step, on the stepped ring, the area wrought in the first turning step is not subjected to cutting. | 06-07-2012 |
Patent application number | Description | Published |
20080276458 | Rolling bearings - An inexpensive rolling bearing is proposed which can be used stably for a long time where the lubricating conditions are severe or bending stresses act. Inner and outer rings of rolling bearings mounted in a rocker arm of an automobile are made of high-carbon chrome bearing steel. They are subjected to heat treatment in which after carbonitriding, high-temperature tempering is carried out. Then they are induction hardened to impart resistance to material quality change and a compressive stress of not less than 200 MPa to the surface layer, thereby markedly improving the rolling contact fatigue life and the tension-compression fatigue strength while keeping the material cost as before. Thus, this bearing can be used stably for a long time even though it is a full complement type bearing, lubricating conditions tend to worsen and the outer ring is repeatedly subjected to bending stress from the cam. | 11-13-2008 |
20090257701 | PROCESS FOR MANUFACTURING ROLLING CONTACT MEMBER, PROCESS FOR MANUFACTURING ROLLING BEARING, RACEWAY MEMBER OF ROLLING BEARING AND ROLLING BEARING - A process for manufacturing a rolling contact member that while simultaneously avoiding the problem attributed to generation of decarburized layer and the problem attributed to scale generation, attains reduction of manufacturing cost. The process comprises the steel member preparation step of preparing a steel member consisting of a steel containing 0.7 mass % or more of carbon; the hot forging step of performing hot forging of the steel member prepared in the steel member preparation step to thereby obtain a blank ring as the first forged member; the first turning step of performing turning of the blank ring obtained in the hot forging step to thereby remove part of the blank ring; and the cold forging step of performing cold forging of the blank ring wrought in the first turning step to thereby obtain a stepped ring. In the steps subsequent to the cold forging step, on the stepped ring, the area wrought in the first turning step is not subjected to cutting operation. | 10-15-2009 |
20090276992 | METHOD FOR MANUFACTURING RACEWAY MEMBER, METHOD FOR MANUFACTURING VALVE TRAIN AND RACEWAY MEMBER - A method for manufacturing a raceway member, in which a hardness of a region to be plastically deformed is controllable in a stable manner and a sufficient rolling contact fatigue life is ensured by making a hardness of a region including a raceway surface sufficiently high, while suppressing increase in the manufacturing cost, includes a steel member preparation step, a heat treatment step, and a finishing step. The heat treatment step includes: a carbonitriding step, in which the steel member is heated to a carbonitriding temperature, which is a temperature not lower than A | 11-12-2009 |
20100002972 | WHEEL SUPPORT BEARING ASSEMBLY AND METHOD OF MAKING THE SAME - There is provided a wheel support bearing assembly in which at least one of the outer member ( | 01-07-2010 |
20100150489 | ROLLING MEMBER, ROLLING BEARING AND PROCESS FOR MANUFACTURING ROLLING MEMBER - The invention provides a deep groove ball bearing which exhibits a long life even in a high-temperature environment or an environment involving the penetration of water in spite of its low alloying element content. The outer race, inner race and ball constituting the bearing are made of a steel which contains 0.3 to 0.4% of carbon, 0.3 to 0.7% of silicon, 0.3 to 0.8% of manganese, 0.5 to 1.2% of nickel, 1.6 to 2.5% of chromium, 0.1 to 0.7% of molybdenum and 0.2 to 0.4 of vanadium with the balance consisting of iron and impurities and in a total content of silicon and manganese of 1.0% or below, a total content of nickel and chromium of 2.3% or above and a total content of chromium, molybdenum and vanadium of 3.0% or below. Surface hardened layers are formed in the outer race, inner race and ball respectively and the surface hardened layers exhibit hardness of 725 to 800 HV, while the maximum particle size of carbides dispersed in the surface hardened layers is 10 μm or below and the area ratio thereof is 7 to 25%. Further, the inner parts exhibit hardness of 450 to 650 HV. | 06-17-2010 |