| 摘要 |
<p>PURPOSE: To eliminate an exclusive use valve disposed in a return oil hole for separation oil by a method wherein a throttle valve part to shield the opening surface of a feed oil hole through a fine gap is extended and the fine gap combines a flow rate regulation function for lubrication oil with a throttle function to suppress the reverse flow of a high pressure refrigerant gas. CONSTITUTION: A main oil reservoir chamber 71 is communicated through a feed oil hole 72 with a central shaft hole 2b, positioned facing the main oil reservoir chamber, through a feed oil hole 7 formed through a valve disc 4. The opening surface of the feed oil hole 72 opened to the main oil reservoir chamber 71 side is shielded by a throttle valve part 25a extended from a delivery valve 25, and substantial communication with the central shaft hole 2b is allowed only through a fine gap S formed between the opening surface of the fed oil hole 72 and the throttle valve 25a. Thus, lubrication oil in the main oil reservoir chamber 71 leaks through the feed oil hole 72 to the central shaft hole 2b by a limit flow rate flowing through the fine gap S. A part of lubrication oil leaking from the main oil reservoir chamber 71 to the central shaft hole 2b is fed in the central shaft hole of a front cylinder block through an oil groove 30 engraved in the outer end faces of two cylinder blocks 2.</p> |
