摘要:
In the ball bearing, the ratio of the radius of curvature of an inner race raceway 4 to the outside diameter of balls 8, 8 is set in the range of 0.51 to 0.54. Also, the ratio of the radius of curvature of an outer race raceway 6 to the outside diameter of balls 8, 8 is set in the range of 0.54 to 0.56. Further, an interior geometric clearance c is set at 13 &mgr;m or less. Thanks to these specifications, the balls 8, 8 can be prevented from running up onto the edge of the outer race raceway 6.
摘要:
In a bearing apparatus which is composed of two bearings each including a crown-shaped retainer and in which a lubricant is filled into its raceways, a preload is applied from the retainer pocket-opening side end face of an inner ring, and also a preload is applied from the retainer counter-pocket-opening side end face of an outer ring.
摘要:
A motor comprises a rotor, a stator, and a shaft wherein one of the stator and the rotor is provided with a housing, a rolling bearing is provided between the housing and the shaft and having an inner race and outer race, the inner race is fixed to the shaft through adhesion between the outer peripheral surface of the shaft and the inner peripheral surface of the inner race, the outer race is fixed to the housing through press-fitting, and the outer peripheral surface of the shaft is formed with knurled grooves, where the number (P) of the knurled grooves in the circumferential direction and the number (Z) of the rolling members in the rolling bearing are in the relations of P≢n Z and P≢nZ±1 where n is a positive integer.
摘要:
To provide a rolling bearing which is superior in preventing electrolytic corrosion, suitable for use in applications where torque reduction of the bearing is required by reducing an amount of lubricant used or by using a lubricant having a low viscosity, and has superior acoustic characteristics and durability, a rolling element according to the present invention is made of an alumina-zirconia composite material including an alumina component and either a zirconia component or a yttria-zirconia component containing 1.5 to 5 mol % of yttria, a mass ratio of the alumina component to the zirconia component or the yttria-zirconia component being 5:95 to 50:50.
摘要:
There are provided at least one aqueous secondary battery and at least one nonaqueous secondary battery having a smaller capacity than that of the aqueous secondary battery. The aqueous secondary battery and the nonaqueous secondary battery are connected in series to constitute a battery pack.
摘要:
Disclosed is a semiconductor memory device includes two equalizing elements, each connected between a pair of bit lines and being separately subjected to on/off control by respective control signals. When performing a test, one of the control signals is kept HIGH and the other of the control signal is kept LOW during a precharge period, and activation/deactivation of the two equalizing elements is separately controlled. A failure such as a defect in one of the two equalizing elements subjected to the on/off control by the control signal can be thereby detected.
摘要:
The present invention relates to a bearing apparatus with a sensor and a rolling bearing with a sensor used to movers such as automobiles or railway carriers, facility machines of equipment, or machine tools. One of the embodiments comprises a sensor detecting conditions of the rolling bearing, a ring-shaped sensor cover housing the sensor therein and secured to a stationary-side bearing ring, and a ring shaped presser member secured to a bearing housing provided outside in a radius direction of the sensor cover, or secured to a shaft, and an opening portion is provided at a decided portion of the sensor cover, and projections standing toward a side of the presser member are furnished in the circumference of the opening portion, the presser member is defined with cutouts for inserting the projections, and the cutouts are arranged with the projections.
摘要:
A hydrocarbon reforming apparatus having a furnace casing, a combustion gas passage formed in the furnace casing, a cylindrical reactor which is made up of multi-layered passages arranged concentrically around the combustion gas passage, with the multilayered passages being filled with catalysts, a combustion gas discharge passage communicating with the combustion gas passage, and a feedstock gas intake passage communicating with any one of the multilayered passages, characterized in that the combustion gas discharge passage is arranged on the inside of either of the outer passage of the multilayered passages or the feedstock gas intake passage, so that the combustion gas discharge passage is separated from the furnace casing.
摘要:
A preload measuring device for a double row rolling bearing unit includes an outer bearing ring member having double rows of outer ring raceways on an inner circumferential surface, an inner bearing ring member having double rows of inner ring raceways on an outer circumferential surface, rolling elements rollably arranged between the outer ring raceways and the inner ring raceways in each of the rows such that contact angles given to the respective rows are opposite to one another, axial displacement measuring means for obtaining an axial relative displacement between the outer bearing ring member and the inner bearing ring member, inclination angle measuring means for obtaining an inclination angle between center axes of the outer bearing ring member and the inner bearing ring member, and preload calculating means for obtaining a preload applied to the rolling elements based on the inclination angle and the axial relative displacement.
摘要:
A preload measuring device for a double row rolling bearing unit includes an outer bearing ring member having double rows of outer ring raceways on an inner circumferential surface, an inner bearing ring member having double rows of inner ring raceways on an outer circumferential surface, rolling elements rollably arranged between the outer ring raceways and the inner ring raceways in each of the rows such that contact angles given to the respective rows are opposite to one another, axial displacement measuring means for obtaining an axial relative displacement between the outer bearing ring member and the inner bearing ring member, inclination angle measuring means for obtaining an inclination angle between center axes of the outer bearing ring member and the inner bearing ring member, and preload calculating means for obtaining a preload applied to the rolling elements based on the inclination angle and the axial relative displacement.