| 摘要 |
PCT No. PCT/IT90/00030 Sec. 371 Date Jun. 18, 1991 Sec. 102(e) Date Jun. 18, 1991 PCT Filed Mar. 19, 1990 PCT Pub. No. WO90/11221 PCT Pub. Date Oct. 4, 1990.Pitch adjustment in a feathering propeller employing a planet gear engagement between a pinion hub keyed on the drive shaft and planet pinions at the base of the blades of the propeller which are rotatably mounted through holes of the wall of a hub's casing may be easily performed manually by registering the relative angular position of a second portion of casing in respect to a first portion of the casing housing the planet gear. The registration of the pitch takes place by parting the second portion of casing from the first portion against the resistance of a push-back spring for a distance sufficient to disengage a coupling between the second portion and first portion of the casing or the pinion hub, rotating the second portion so disengaged in respect to the first portion of the casing before releasing the pull causing again the engagement of the two portions in a modified relative angular position. In this way the stop mechanisms for the travel of a dragging sector solidly connected to the hub of the propeller, which are substantially formed on the internal wall of the second portion of the casing, change their relative position about the sector thus modifying the limit orientation assumed by the blades when the drive shaft is rotated. Resilient elements are used between abutment surfaces for preventing deformation thereof.
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