Abstract: A speed reducer including a shaft extending along an axis, two rolling bearings arranged around the shaft, the two rolling bearings each including a radially outer ring, a radially inner ring and rolling elements arranged between the outer and inner rings. The speed reducer includes a preload system positioned between the two rolling bearings and which includes: two spacer elements each one resting against one of the rings of the rolling bearings, at least one elastically deformable element interposed between the two spacing elements, and configured to occupy a preloaded first state and an least partially relaxed second state, the preload system arranged such that the transition of the at least one elastically deformable element from the first to the second state causes a unidirectional rotational movement of each spacer element with respect to the other so as to use a wedge effect to generate preload in the rolling bearings.

Abstract: A speed reducer including a shaft extending along an axis, two rolling bearings arranged around the shaft, the two rolling bearings each including a radially outer ring, a radially inner ring and rolling elements arranged between the outer and inner rings. The speed reducer includes a preload system positioned between the two rolling bearings and which includes: two spacer elements each one resting against one of the rings of the rolling bearings, at least one elastically deformable element interposed between the two spacing elements, and configured to occupy a preloaded first state and an least partially relaxed second state, the preload system arranged such that the transition of the at least one elastically deformable element from the first to the second state causes a unidirectional rotational movement of each spacer element with respect to the other so as to use a wedge effect to generate preload in the rolling bearings.

Abstract: An electromechanical assembly including an electric machine coupled to a reducing gear, the electric machine including two bearings or rollers, the reducing gear including two bearings or rollers, the reducing gear and the electric machine each including a housing including means for attachment to the other housing, the electric machine and the reducing gear each including a shaft engaged in the other, each shaft including centring projections produced in such a way that the mutual engagement of the shafts has a centring effect that positions the housings correctly in order for them to be attached by means of the attachment means.