Variable guide vane assembly for gas turbine engine

A variable guide vane assembly for a gas turbine engine stator having a shroud and a hub, the shroud and hub extending circumferentially, the shroud disposed radially outside of the hub, the shroud and hub collectively forming an annular gas path therebetween, the variable guide vane assembly comprising:

• a plurality of vanes extending between the shroud and the hub, and the vanes are circumferentially disposed and spaced apart from one another, wherein each vane includes:
• an inner radial end disposed adjacent the hub;
• an outer radial end disposed adjacent the shroud;
• an inner radial post;
• an outer radial post;
• and
• a rotational axis extending through the inner radial post and the outer radial post;
• wherein each vane is pivotally mounted to rotate about its rotational axis;
• and
• a plurality of rotational-translational mechanisms (RT mechanism), each respective RT mechanism in communication with the inner radial post or the outer radial post of a respective said vane, the RT mechanism including a pin connected to the vane and disposed in a ramp slot, the ramp slot extending circumferentially between a first lengthwise end and a second lengthwise end, and the ramp slot is configured such that rotation of the vane relative to the ramp slot causes the pin to travel within the ramp slot and the vane to translate linearly between the shroud and the hub;
• and
• wherein at least one of the plurality of RT mechanisms includes a non-rotational ramp spacer, the ramp spacer having an inner bore configured to receive the inner radial post or the outer radial post of the respective said vane, wherein the ramp slot is disposed in the ramp spacer.