| 摘要 |
PURPOSE:To effectively reduce the temperature of working oil which is increased due to a high-speed rotation of a rotary body, by forcibly cooling an outer wall of a rotary body-supporting structure with artificial wind generated by a fan. CONSTITUTION:The outer peripheral end of a fan 52 fastened directly to a rotary valve 2 with bolts 51 is substantially aligned with that of fins 53 provided on the outer circumferential surface of a sleeve body 9. The fan 52 is surrounded with a fan cover 14 fastened to the sleeve body 9 with bolts X. The fan cover 14 is formed such that it is partially paralel to the circumscribed circle of the fan 52 and spaced therefrom at a predetermined distance to thereby form an air introducing space. Cooling air introduced into the mentioned space from the outside flows therein substantially in a stratified state to advance therefrom through spaces among the fins 52, 52 provided on the downstream side of the fan 52. The cooling air serves to promote the radiation of heat from the sleeve body 9 and reduce the temperature of a working oil. |
