Variable pitch fan

A device with a fixed actuator for a system for controlling the orientation of a plurality of fan blades of a turbomachine, comprising:

• an annular casing for the turbomachine forming a support for a bearing, said annular casing being configured to be centered on a longitudinal axis of the turbomachine and inclined with respect to the latter;
• at least one actuator cylinder body extending at least partially into the annular casing, wherein the at least one actuator cylinder body comprises an inner volume in which a piston is able to slide, separating the inner volume into two chambers isolated from each other, wherein the at least one actuator cylinder body is a part attached to the annular casing such that the at least one actuator cylinder body is separable from the annular casing;
• and
• at least one actuator cylinder rod passing through the annular casing body and at least partially into the inner volume, wherein the at least one actuator cylinder rod comprises one end fastened to the piston and an opposite end intended to be connected to an inner ring of a movement transfer bearing to drive the movement transfer bearing in translation, wherein said inner volume of the at least one actuator cylinder body is closed downstream by a chamber bottom of the annular casing which forms one-piece with the annular casing.