Mechanism for variable adjustment of blades for a system of contra-rotating propellers, and a system of contra-rotating propellers comprising at least one such mechanism

摘要

A mechanism for adjusting pitch of blades of a propeller of a system of contra-rotating propellers for a turbomachine, wherein each blade moves around a radial axis. The mechanism includes a linear actuator, a structure to transform movement imparted by the linear actuator into rotation of each of the blades in a synchronized manner around their radial axis, the structure including a bracket of longitudinal axis formed of a central ring, an outer ring, and multiple radial arms rigidly connected to the central ring and to the outer ring. The central ring can be subject to actuation of the linear actuator, and the central ring and the outer ring are positioned in two separate planes, orthogonal to the longitudinal axis, such that the bracket is shaped as a truncated cone.

主权项

1. An adjustment mechanism for adjusting pitch of blades of at least one propeller of a system of contra-rotating propellers for a turbomachine in which each blade is configured to move around a radial axis, comprising:
a linear actuator; and a device to convert movement imparted by the linear actuator into rotation of each of the blades in a synchronized manner around their radial axis, the device comprising a bracket of longitudinal axis formed of a central ring, an outer ring, and multiple radial arms rigidly connected to the central ring and to the outer ring, the radial arms traversing a principal annular airstream of the system of contra-rotating propellers, the central ring configured to be subject to actuation of the linear actuator, the central ring and the outer ring being positioned in two separate planes, orthogonal to the longitudinal axis, such that the radial arms are inclined relative to the longitudinal axis, and the bracket being shaped as a truncated cone.