| 摘要 |
PROBLEM TO BE SOLVED: To improve a lubrication effect and to reduce a grease feed amount by effectively returning grease, not attributing to lubrication, to a necessary part. SOLUTION: An air feed hole 8 is provided to open to the land parts 6 and 7 of the screw grooves 4 and 5 of a screw shaft 1 or a nut 2. The air feed hole 8 is formed in the nut 2 in a case of a pall screw having specifications to rotate the screw shaft 1 and in the screw shaft 1 in case of specifications to rotate the nut 2. The air feed hole 8 may be also used for a grease feed hole. Air may be always fed or intermittently fed.
|
