Nsk Corporation

Koichiro Ono

Takeshi Takizawa

Tomoyuki Yanagisawa

Mamoru Aoki

Daisuke Kobayashi

Ikunori Sakatani

Nagao Dohi

Kinji Yukawa

Junji Ono

Taketoshi Chifu

Kenichi Shibasaki

A magnetic sensor arranged close to a component of a rolling machine element measures magnetic flux density in the axial direction and/or radial direction of the component, then the amount of change in magnetic flux density is calculated based on a reference magnetic flux density corresponding to the magnetic flux density before the start of use of the component, and the progression of fatigue of the rolling machine element is determined from the amount of change.

Rolling machine element fatigue diagnosis method and rolling machine element fatigue diagnosis system

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.

Preload measuring device for double row rolling bearing unit

An encodera characteristic of which is changed alternately at an equal interval in a circumferential direction is supported/fixed onto a hubconcentrically with the hub. A sensing portion of a sensorsupported on the outer ringis positioned in close vicinity to a sensed surface of the encoderto face thereto. Width dimensions of first and second sensed portions provided onto the sensed surface are changed continuously in a direction along which a to-be-sensed load is applied. Since a pattern according to which an output signal of the sensoris changed is changed pursuant to a change of the load, the load is derived by observing this pattern. The output signal is also utilized to sense a rotation speed of the hubin ABS or TCS control.

Rolling bearing unit with load measuring unit

There are provided first and second characteristic change portionsandhaving characteristic boundary inclination directions different from each other in an inner half portion and an outer half portion of the encoder. Detections portions of one pair of sensors() and() are opposed to three circumferential positions of both the characteristic change portionsand. A operator has a function of calculating the displacements x, y, z, and inclinations &#x3a6;x, &#x3a6;z, on the basis of phase differences among output signals of the sensors, and.

State measuring apparatus for rotary machine

An encoderchanging a characteristic thereof alternately and at equal intervals with respect to circumferential direction is supported by and fixed to the hubconcentrically. A detecting portion of a sensorsupported by the outer ringis closely opposed to a detected face of the encoder. Width dimensions of first, second detecting portions provided at the detected face are changed continuously with respect to direction of operating a load to be detected. In accordance with a change of the load, a pattern of changing an output signal of the sensoris changed. Thus, the load is calculated by observing the pattern. By performing filtering process on a signal expressing the change in the pattern, a variation based on the mounting error or the like is removed.

Displacement measuring apparatus and load measuring apparatus of rotating member

A stability control apparatus, includes: a grip detector that changes an output based on a grip force applied in a direction hindering a slippage of a wheel, acting on a contact face between the wheel supported by a wheel supporting rolling bearing unit and the road surface, the wheel supporting rolling bearing unit for supporting freely rotatably the wheel to a vehicle body; and a controller that performs a control for keeping a running stability of the vehicle in response to an input of a detection signal of the grip detector.

Stability control apparatus and load measuring instrument for wheel supporting rolling bearing unit

Revolution speeds of rolling elements in respective rows are sensed, and then the axial load or the radial load is derived based on the revolution speeds. In case the acting directions of these loads are displaced, the contact angles of the rolling elements in respective rows are differentiated in response to this displacement, or values of influence coefficients used to detect respective loads are changed based on the revolution speeds.

Load measurement on rolling bearing with particular revolution speed measurements

Revolution speeds n, nof rolling elementsare sensed by a pair of revolution speed sensors. Also, a rotational speed nof a hubis sensed by a rotational speed sensor. A sum 'n+n' or a difference 'n&#x2212;nb' the revolution speeds of rolling elementsin double rows is calculated based on sensed signals of the revolution speed sensors, and then a ratio &#x201c;n+nb/ni&#x201d; or &#x201c;n&#x2212;n/n&#x201d; of this sum or difference to the rotational speed nis calculated. Then, the radial load or the an axial load is calculated based on the ratio &#x201c;n+nb/ni&#x201d; or &#x201c;&#x2212;n/ni&#x201d;.

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Kanagawa, Japan

Koichiro Ono