System for locking a first shaft with respect to a second shaft eliminating clearances between said shafts

A system for locking, with respect to rotation and translation, a first shaft with a second shaft, said first shaft being substantially coaxial with a second shaft, a part of said first shaft being disposed in an axial bore in said second shaft, said system comprising a locking device movable between a locking position, wherein the first shaft is integral, with respect to rotation and translation, with the second shaft, and a release position wherein the first shaft is not engaged with the second shaft, said system being characterised in that the first shaft has an end part comprising two walls inclined towards each other in a transverse direction, the axial bore comprising two corresponding walls extending in the same direction as the inclined wall of the first shaft opposite these, the change to the locking position of the locking device causing a transverse movement of the end part of the first shaft so as to put the inclined walls of said end part in abutment against the corresponding walls of the axial bore in order to substantially eliminate the clearance between the first and the second shaft in the locking position,

• said first shaft comprises at least one housing, the second shaft comprising at least one orifice positioned opposite said housing in the locking position, the locking device comprising a control member movable in axial translation between the release position and the locking position, and a locking member actuated in transverse translation by the control member between a release position wherein the locking member is positioned out of the housing, and a locking position wherein the member goes through the orifice of the second shaft and is positioned in the housing, so as to lock the first shaft with respect to the second shaft,
• the control member has an inner wall forming a slope, said slope bearing against the locking member so that the axial translation movement of the control member causes the transverse translation movement of the locking member upon the changing from the release position to the locking position,
• the control member is a ring positioned around the first and the second shafts,
• the ring is movable in rotation according to a determined range in the release position, with a spacing being provided in the inner wall, said spacing being opposite the locking member when the ring has rotated on said range, so that the inner wall no longer bears on the locking member and that the latter can change from the locking position to the release position thereof, and
• wherein an abutment surface is provided integral with the second shaft and has a hole the width of which defines the rotation range of the ring, said ring having a stop introduced into said hole when the ring is in the release position, so as to stop the rotation of said ring when the stop reaches an edge of the hole.