Abstract: The invention relates mainly to an assembly comprising: —a combustion engine ring gear having a plurality of teeth, the said ring gear being defined by a modulus and a pressure angle, —a starter comprising a pinion (31) able to engage with the said ring gear of the said combustion engine, the said pinion (31) having a plurality of teeth (42) is defined by a modulus (Mp) and a pressure angle (alpha_p), characterized in that a pinion product which is the product of the modulus (Mp) of the said pinion (31) and the cosine of the pressure angle (alpha_p) of the said pinion (31) is greater than a ring-gear product equal to the product of the modulus of the said ring gear and the cosine of the pressure angle of the said ring gear.

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.

Abstract: The invention relates mainly to an assembly comprising:—a combustion engine ring gear having a plurality of teeth, the said ring gear being defined by a modulus and a pressure angle,—a starter comprising a pinion (31) able to engage with the said ring gear of the said combustion engine, the said pinion (31) having a plurality of teeth (42) is defined by a modulus (Mp) and a pressure angle (alpha_p), characterized in that a pinion product which is the product of the modulus (Mp) of the said pinion (31) and the cosine of the pressure angle (alpha_p) of the said pinion (31) is greater than a ring-gear product equal to the product of the modulus of the said ring gear and the cosine of the pressure angle of the said ring gear.

Abstract: Motor vehicle starter comprising a starter head provided with a pinion (1), a driver (2) and a coupling device with a conical clutch for coupling the pinion to the driver (2), in which the conical clutch comprises a first frustoconical friction surface (8) fixed to the pinion and a second frustoconical friction surface (8?) with a shape complementary to the first surface (8) and fixed to the driver and in which the coupling device comprises on the one hand a hollow-shaped coupling piece having. a bottom extended by an annular skirt directed axially towards one of the elements consisting of pinion and driver and on the other hand axially acting elastic means (10) bearing on a first stop fixed to the coupling piece for acting on a second stop fixed to one of the elements consisting of pinion and driver. The elastic means comprise axially deformable tongues (10b) and extend circumferentially.

Abstract: This invention proposes a combination of a drive pulley (30) with the rotor of a rotary electrical machine for a motor vehicle, especially an alternator or alternator-starter, comprising, firstly, a shaft (18) carrying a rotor and a front ball bearing (26), and secondly, a pulley (30) which has a peripheral working zone (92) arranged to cooperate with a drive belt, together with a central hub (93) which has an axial hole (94) for the rotor shaft (18) to pass through it, characterised in that the pulley (30) has a splined internal portion (95) such that it can be force-fitted on a complementary splined external portion of the rotor shaft (18).

Abstract: Motor vehicle starter comprising a starter head provided with a pinion (1), a driver (2) and a coupling device with a conical clutch for coupling the pinion to the driver (2), in which the conical clutch comprises a first frustoconical friction surface (8) fixed to the pinion and a second frustoconical friction surface (8′) with a shape complementary to the first surface (8) and fixed to the driver and in which the coupling device comprises on the one hand a hollow-shaped coupling piece having a bottom extended by an annular skirt directed axially towards one of the elements consisting of pinion and driver and on the other hand axially acting elastic means (10) bearing on a first stop fixed to the coupling piece for acting on a second stop fixed to one of the elements consisting of pinion and driver; the skirt is fixed to the pinion or driver and carries internally the surface (8, 8′) concerned.

Abstract: Motor vehicle starter comprising a starter head provided with a pinion (1), a driver (2) and a coupling device with a conical clutch for coupling the pinion to the driver (2), in which the conical clutch comprises a first frustoconical friction surface (8) fixed to the pinion and a second frustoconical friction surface (8′) with a shape complementary to the first surface (8) and fixed to the driver and in which the coupling device comprises on the one hand a hollow-shaped coupling piece having a bottom extended by an annular skirt directed axially towards one of the elements consisting of pinion and driver and on the other hand axially acting elastic means (10) bearing on a first stop fixed to the coupling piece for acting on a second stop fixed to one of the elements consisting of pinion and driver. The elastic means comprise axially deformable tongues (10b) and extend circumferentially.