Motor vehicle starter pinion provided with a tooth root with a variable radius of curvature

Abstract

The invention relates mainly to a motor vehicle combustion engine starter motor comprising:—a pinion body comprising splines on its external periphery,—a pinion (31) having an axis (Y), the said pinion (31) being mounted with the ability to move on the pinion body comprising an internal periphery comprising splines (44) engaged with the splines of the said pinion body, the said pinion (31) comprising, on its external periphery,—teeth (42) each having two tooth flanks (47) each comprising:—a working flank (48), and—a tooth root (49) extending from the said working flank (48) of the corresponding tooth (42), characterized in that the said tooth flank (47) comprises at least one tooth root (49) delimited by a curved portion (PC) having a variable radius of curvature.

Dependencies are inferred from the claim text.