Transmission casing, method for mounting same, and self-propelled vehicle provided with such a transmission casing

A transmission box comprising:

• at least two box portions assembled together in the closed state of the box,
• at least one opening for the access to the inside of the box and
• an output shaft that can be inserted into the box through at least the one of the openings referred to as the insertion opening of the box, and configured to, in the inserted state in said box and closed state of box, extend at least partially out of the box, this output shaft being made of a single piece or at least two shaft sections,
• the box further comprising, for the output shaft or at least one of the output shaft sections, at least one device for limiting the axial displacement of the output shaft or the output shaft section according to at least one direction opposite to the direction of insertion of the output shaft or the output shaft section into said box in the inserted state of the output shaft or the output shaft section in the box and in the closed state of the box,
• wherein this device for limiting axial displacement able to be activated to pass from an inactive state to an active state in which any axial displacement of the output shaft or the output shaft section inside the box according to at least one direction opposite to the direction of insertion of the output shaft or the output shaft section into the box is limited or prevented is a device that can be activated in the closed state of the box,
• wherein the device for limiting the axial displacement of the output shaft or the output shaft section according to at least one direction opposite to the direction of insertion of the output shaft or the output shaft section into said box comprises at least a first part carried by the output shaft or said output shaft section to be limited in axial displacement and a second part housed inside the box,
• wherein at least the second part of the device for limiting the axial displacement of the output shaft or the output shaft section according to at least one direction opposite to the direction of insertion of the output shaft or the output shaft section into said box, which is an elastically deformable part, has the form of a self-locking axle lock washer provided with elastically deformable inner radial tabs, in that the first part of the device for limiting the axial displacement of the output shaft or the output shaft section at least according to one direction opposite to the direction of insertion of the output shaft or the output shaft section into said box is formed by a segment portion of the output shaft or the output shaft section and in that, in the activated state of the device for limiting axial displacement, the tabs of the lock washer extend around the segment portion of the output shaft or the output shaft section forming the first part of the device for limiting axial displacement and occupy, in relation to said segment portion of the output shaft or of the output shaft section, an angular clamping position in which any displacement of the output shaft or the output shaft section at least according to one direction opposite to the direction of insertion of the output shaft or the output shaft section into said box is limited or prevented by buttressing of said tabs on the segment portion of the output shaft or the output shaft section, and
• in that this device for limiting axial displacement is configured to, in the closed state of the box, pass from an inactive state to an active state, depending on the position occupied by the output shaft or said output shaft section in said box, by the simple displacement of the output shaft or the output shaft section from the or one of the insertion openings of the box towards the inside of the box to a predetermined position.