公开(公告)号：US4704067A

公开(公告)日：1987-11-03

申请号：US874841

申请日：1986-06-16

Applicant: Robin D. Fisher

Inventor： Robin D. Fisher

IPC: B64C11/32 ,  F01D7/00 ,  B64C11/36 ,  B63H3/04

CPC classification number: F01D7/00 ,  B64C11/32

Abstract: A pitch control mechanism for propellers uses an elongated flat strip twisted into a helicoidal. The helicoidal is longitudinally slidable within a hollow propeller shaft. A cup-shaped cylindrical control ring coaxially mounted with respect to the front transverse surface of the propeller shaft is supported by an inner bearing ring permitting both longitudinal and rotational movement of the control ring relative to the propeller shaft. The control ring has a rectangular slot in its disc-shaped front face which fits conformally over the transverse cross section of the helicoidal. Longitudinal motion of the helicoidal therefore causes rotation of the control ring. Propeller blades are fastened to support rods terminating in downward extending, bifurcated fork-like support structures. The front tine of each fork is rotatably supported in a radial hole in the control ring, while the rear tine is rotatably supported by an axial hole in the propeller shaft. Rotation of the control ring relative to the propeller shaft causes rotation of each propeller blade support rod about its own axis, effecting uniform change in pitch of each propeller blade.

Abstract translation: 螺旋桨的桨距控制机构使用扭曲成螺旋形的细长扁平条。 螺旋形可在空心螺旋桨轴内纵向滑动。 相对于传动轴的前横向表面同轴安装的杯形圆柱形控制环由允许控制环相对于推进器轴的纵向和旋转运动的内轴承环支撑。 控制环在其盘形前表面上具有矩形槽，该矩形槽适合螺旋形的横截面。 因此，螺旋体的纵向运动导致控制环的旋转。 螺旋桨叶片被紧固到支撑杆，其终止于向下延伸的，分叉的叉形支撑结构。 每个叉的前齿可旋转地支撑在控制环中的径向孔中，而后叉由螺旋桨轴中的轴向孔可旋转地支撑。 控制环相对于推进器轴的旋转导致每个螺旋桨叶片支撑杆绕其自身的轴线旋转，从而实现每个螺旋桨叶片间距的均匀变化。