Abstract: A cover equipped for the case of a reduction unit of a motor reducer, the case being designed to contain reducing gears; wherein the cover is provided with a first portion including a first opening having a corresponding first plug, the first plug having a through hole as a breather hole for the air and vapors from heating and shaking of the lubrication oil contained in the case, and wherein the cover is further provided with a second portion including a second opening having a corresponding second plug, the second opening operable for draining off used oil.

Abstract: An angular reducer with two or three reduction stages, wherein the casing is designed to selectively house two or three reduction stages, while maintaining unchanged, when switching from two to three stages or vice versa, the mutual positions of the axis of the drive shaft and the axis of the driven shaft; and wherein the casing has a number of inner supports for supporting the two alternative gear trains.

Abstract: A multistage angular reducer includes a casing, a drive shaft, a driven shaft connected to a user element, and a number of reduction stages housed inside the casing between the drive shaft and the driven shaft. At least one stage is defined by a pair of gears including a bevel pinion and a bevel ring gear. The casing may selectively house two or three reduction stages, while maintaining unchanged, when switching from two to three stages or vice versa, the mutual positions of the axis of the drive shaft and the axis of the driven shaft.

Abstract: The reduction gear box comprises a housing, an input shaft having its longitudinal axis horizontal and coupled to a drive shaft, an output shaft having its longitudinal axis horizontal and coupled to a utilizer shaft, and several drive reduction stages within the housing between the input shaft and the output shaft. One stage after the first stage includes a gear pair constituted by a hypoid bevel pinion and a bevel crown gear with mutually perpendicular axes, the axis of the pinion being offset from the axis of the crown gear by an offset distance equal to the algebraic sum of the offset of interaxial spacing between the other gear stages measured in the direction of the offset distance of the gear pair such that the axes of the input shaft and of the output shaft intersect at right angles and lie in the same horizontal plane.