An object of the invention is to always maintain an outer pin holder and a housing in a speed reducer section at their predetermined positions, to prevent damage to such components as revolving members, outer circumferential engagers, and motion conversion mechanism upon a large axial load due to turning or sudden acceleration/deceleration, etc., and to eliminate rattling noise caused by the housing and the outer pin holder. A casing immobilizing member which is fixed to an inner surface of a speed reducer section casing and a housing immobilizing member which is fixed to an outer surface of a speed reducer section housing are provided between the speed reducer section casing and the speed reducer section housing. The casing immobilizing member and the housing immobilizing member are bonded with each other via a rubber member.

In-wheel motor drive device

A bearing unit for vehicle wheel support comprising a shaft having a mounting flange for vehicle wheel or suspension apparatus, a step portion formed on one end portion thereof, a first inner ring raceway directly formed thereon, and a crimped portion formed on the end side of the step portion, and an inner ring fitted onto the step portion and having a second inner ring raceway thereon, the shaft being quench hardened at least at the first inner ring raceway with the crimped portion kept as formed and without quench hardened, and the inner ring being fixed to the shaft by the crimped portion of the shaft.

Rolling bearing unit for supporting vehicle wheel

A bearing device supporting a rotation shaft (13) of a fuel cell compressor (1) includes a pair of radial foil bearings (21,22) and mounted in concentric relation to the rotation shaft and supporting the rotation shaft in a radial direction, and an axial magnetic bearing (23) opposed to the rotation shaft in an axial direction and supporting the rotation shaft in the axial direction. A control device (61) includes bearing life diagnostic unit for accumulating times during which a rotational speed of the rotation shaft has been below a predetermined value, so as to obtain a cumulative contact time, thereby judging a bearing lifetime.

Compressor for fuel cell

A toroidal type continuously variable transmission includes an input disk mounted on an input shaft; an output disk mounted on an output shaft; and a pair of power roller bearings each of which includes an inner race, an outer race, and a plurality of rolling elements. The inner races are engaged with the input and output disks to transmit the power of the input shaft to the output shaft. The inner races, outer races, input disk and output disk are made of case hardening steel, and are each subjected to a heat treatment in which carburizing or carbonitriding, hardening and tempering are performed sequentially, and then to shot peening, and finished by grinding of a predetermined grinding portion.

Toroidal type continuously variable transmission parts having increased life

A stainless steel bearing component (A) containing in excess of 11 % chromium and between 0.05 % and 0.50 % carbon is case-hardened by introducing carbon or nitrogen into the surface of the race using a plasma process. The component is placed in a vacuum chamber. Using the component at elevated temperature as a cathode, hydrogen is introduced into the chamber and ionized, whereupon hydrogen ions bombard the component and clean its surface. A gas containing carbon and/or nitrogen is introduced into the chamber where it exists at a pressure of 2-9 torr. A plasma is produced intermittently and deposits carbon and/or nitrogen onto the component, causing it to diffuse from the surface inwardly. Thereafter, the component is cooled, heated to transform the steel in the core to austenite, and then quenched. The quench is followed by cryogenic cooling to convert retained austenite into martensite. After assuming ambient temperature, the component is again heated to temper the hardened case.

Case-hardened stainless steel bearing component and process for manufacturing the same

One of component parts of an inner race, an outer race and rolling elements of a rolling bearing is composed of a bearing material that is prepared by working a high-speed steel, carburizing or carbonitriding the wrought steel in a temperature range from 800° C. to less than 1200° C. and subsequently hardening and tempering the carburized or carbonitrided steel, the steel composing of 0.2 wt %≦C≦2.3 wt %, Si≦1.0 wt %, Mn≦1.0 wt %, 2.0 wt %≦Cr≦7.0 wt %, 1.5 wt %≦W≦22.0 wt %, Mo≦10.0 wt %, 0.5≦V≦6.0 wt %, Co≦18.0 wt %, the balance Fe and incidental impurities. By carburizing or carbonitriding the steel at low temperatures less than 1,200° C., not only high core toughness is insured but also the dissolved C or N in the surface is compensated to increase the hot strength of the steel and the compressive stress that remains in the surface after heat treatment, so that the rolling bearing that rotate at high speed and high temperatures of more 400° C. extends the service life.

Rolling bearing for high-speed rotation at high temperatures

PROBLEM TO BE SOLVED: To provide a rolling support device for a fuel cell with an excellent seizure service life characteristic even under severe conditions, such as high temperature, high speed and mixing of gas containing steam and moisture. SOLUTION: An outer ring 11 of a needle roller bearing 10 is formed by using a seizure-resistant material which is formed by applying hardening at 200°C or higher to alloy steel comprising 0.3-1.1 wt.% C, 0.15-1.5 wt.% Si, 0.5-1.8 wt.% Cr, 0.15-1.8 wt.% Mn and the balance Fe with inevitable impurities, after carbonitriding, such that the value representing as a product of Si concentration (wt.%) and N concentration (wt.%) of the material's surface is 0.08-0.91. In addition, a seal S is provided on an opening end of a recessed part 9 to which the needle roller bearing 10 is fitted. COPYRIGHT: (C)2004,JPO&NCIPI

Rolling support device

A rolling device includes: an outer member; an inner member; and a plurality of rolling elements arranged between the outer and inner members, the outer member having a first contact surface which contacts the rolling elements, the inner member having a second contact surface which contacts the rolling elements, each of the rolling elements rolling against the first and second contact surfaces. At least one of the outer member, inner member, and rolling elements is formed of steel containing: C of less than 0.6 wt %; Cr of 10.0 wt % to 22.0 wt %; Mn of 0.1 wt % to 1.5 wt %; Si of 0.1 wt % to 2.0 wt %; N from 0.05 wt % to less than 0.2 wt %; Mo of 0 to 3.0 wt %, and V of 0 to 2.0 wt %; and the balance Fe and inevitable impurities, the steel satisfying C %+N %≧0.45 wt % and containing retained austenite of ≦6 vol %. The rolling device has excellent characteristics in fatigue strength, wear resistance, corrosion resistance, and acoustic characteristic.

Rolling bearing and rolling device

PROBLEM TO BE SOLVED: To provide a rolling member in which deterioration in rolling fatigue characteristics and wear characteristics caused by the harshening of using conditions of bearings, ball screw apparatus or the like is prevented and excellent in wear resistance. SOLUTION: At least one of a rolling member in a rolling bearing or a ball screw apparatus is formed of alloy steel contg., by weight, 0.1 to 0.7% C, 0.1 to 1.5% Si, 0.1 to 1.5% Mn, 0.5 to 3.0% Cr, 0.6 to 2.0% V, =920 deg.C to control the concn. of carbon to 0.7 to 1.3 wt.% and the concn. of nitrogen to 0.15 to 0.3 wt.% in the surface of a perfect article, by which, on the surface, carbides, nitrides and carbonitrides of <=0.1 μm particle size are precipitated at least by 400 pieces/100 μm2.

Rolling member excellent in wear resistance

PURPOSE: To improve the wear resistance of a bearing and to obtain its excellent productivity, in a rolling bearing formed by incorporating a specified amt. of V into a medium-low carbon low alloy steel, by executing carburizing or carbo-nitriding treatment at the time of heat treatment and precipitating VC carbides on to the surface of the product. CONSTITUTION: At least one of the bearing ring and a rolling body of a rolling bearing is formed by a steel stock obtd. by incorporating, by weight, 0.8 to 2.0% V into a medium-low carbon alloy steel contg. 0.1 to 0.7% C, 0.5 to 3.0% Cr, 0.3 to l.2% Mn, 0.3 to l.5% Si and ≤0.3% Mo. At the time of subjecting the formed product to heat treatment, carburizing or carbonitriding is executed. By this treatment, the relationship in which carbon concn. in the surface of the product is regulated to 0.8 to 1.5wt.% and the V/C concn. ratio in the surface is regulated to 1 to 2.5 is satisfied, and VC carbides are precipitated on to he surface of the product. Since the surface of the product is coated with fine VC type carbides having high hardness, the wear resistance of the bearing under severe using conditions can be improved. COPYRIGHT: (C)1996,JPO

Kenji Yamamura

Papers

Rolling bearing for high-speed rotation at high temperatures

Rolling support device

Rolling bearing and rolling device

Rolling member excellent in wear resistance

Rolling bearing excellent in wear resistance