Measuring and testing – Dynamometers – Responsive to force
Patent
1997-05-27
1999-03-02
Biegel, Ronald
Measuring and testing
Dynamometers
Responsive to force
7386201, G01L 500
Patent
active
058774335
ABSTRACT:
In a duplex bearing 10 in which a preload is applied to balls 14a and 14b interposed between an outer race 11 and first and second inner races 12 and 13 by tightening a nut 16, a preload jig 19 fitted to the lower end of the second inner race 13 is turned by a motor 21 and applied with an axial load by a rod 31. The rod 31 has a load detector 31 at the middle. Position sensors 24 and 25, each of which is adapted to detect an amount of displacement in the direction of axis, are provided at the ends of the outer race 11 and the second inner race 13, respectively. A rotation detecting sensor 33 adapted to detect a rotational position is provided below the lower surface of the preload jig 9. Under the condition that the axial load is applied to the extent that measuring loads are FH and FL, the amounts of average displacement XAH and XAL of the outer race 11, and the amounts of average displacement XBH and XBL are detected, and the amounts of displacement .DELTA.XH and .DELTA.XL which are the differences between those amounts are calculated, so that the aimed rigidity KA is calculated by utilizing the amounts of displacement .DELTA.XH and .DELTA.XL thus calculated.
REFERENCES:
patent: 3100989 (1963-08-01), Jones
patent: 3287966 (1966-11-01), Haan et al.
patent: 3665758 (1972-05-01), Tiller
patent: 5423218 (1995-06-01), Matsuzaki
patent: 5509198 (1996-04-01), Takamizawa et al.
Matsuzaki Hiroyuki
Tadokoro Hisakazu
Biegel Ronald
NSK Ltd.
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