Wiper arm shaped as an aerodynamic deflector

A wiper arm of the type containing an arm body that extends longitudinally from a rear driving end towards a front end that bears a wiper blade, and of the type in which, in cross section, at least a section of the arm body has an upturned U-shaped cross-section defined by upstream and downstream wings mutually connected by an upper back, both wings extending towards a surface to be wiped, the downstream wing remaining substantially perpendicular to the upper back and the upstream wing forming an acute angle relative to a median plane parallel to the downstream wing to form an aerodynamic deflector integrated in the wiper arm which, an action of a relative downwind direction, tends to urge the wiper arm towards the surface to be wiped, characterized by the upstream wing presenting a surface, a curve of which varies progressively from one end to the other of the wiper arm body, and of which the value of the acute angle ranges between 30° and 45°.