| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a structure capable of ensuring the circulation of lubricant and performing a highly reliable test.SOLUTION: The bottom of a lubrication oil reservoir 6a provided inside a fixed housing 1a has a partially cylindrical concave surface that is concentric with the central axis of a revolving shaft 2a. The radius r of curvature of the bottom is 0.6 to 2 times of the external diameter D of a radial rolling bearing 3c. A heater 27 is provided between the bottom and the outer peripheral surface of a support sleeve 17b externally fitted with the radial rolling bearing 3c, in a state in which a gap is interposed between both the upper and lower sides of the heater 27, the bottom and the outer peripheral surface.</p> |
