| 摘要 |
<p>Grooves (20-27) in equal number are formed on the end surfaces (19a and 19b) of a roller (19), respectively, communicating portions (20a-27a) for establishing communication between the above-mentioned grooves and the inner periphery of the roller (19) are provided and sealing portions (20b, 20c, 20d, 20e and 20f-27b, 27c, 27d, 27e and 27f) each being decreased in a sectional area are formed. With this arrangement, the sectional areas are decreased relative to a direction of contamination of lubricant oil, so that a plurality of oil pressures can be obtained, thereby securing a constant clearance of the roller (19).</p> |
