| 摘要 |
<p>1,138,373. Bearings. FOXBORO CO. 19 Oct., 1966 [22 Oct., 1965], No. 46845/66. Heading F2A. [Also in Division F1] A bearing comprises a shaft with a bulbous portion of circular cross-section, a flattened peripheral band on the portion engaging an internal cylindrical or conical surface of a bearing element. In Fig. 1, portion 12 is partspherical and contacts element 15 over a cylindrical flat 20 which is machined on to the journal. Alternatively, a flat is not initially formed but is produced by wear. The flats are narrow enough to preclude formation of a supporting fluid film between the bearing surfaces. Two portions 12, 13 rotatably support shaft 11 of a flowmeter carrying a rotor 10, axial thrust being taken by end plate 14 or 16 depending on the direction of fluid flow. The portions are of tungsten carbide, elements 15, 17 of aluminium oxide, and plates 14, 16 of sapphire. In the flowmeter of Fig. 2 (not shown), fluid flows between vanes (25) over nose-cone (27), rotates the rotor and exits over nose-cone (28) and between vanes (29). A pulse is induced in magnetic pick-up (31) as each blade (9) of the rotor passes.</p> |
