Starter motor with drive assembly fitted with a coupling system for coupling a pinion mounted freely on its rotor shaft, and associated method

Abstract

The invention relates to a starter motor (1) with drive assembly for a combustion engine, and to the associated method. The starter motor comprises an electric motor in which, when electrically powered, it drives the rotation of its rotor shaft about its longitudinal axis in a direction of rotation for starting. The starter motor further comprises a drive shaft that can be rotationally coupled to the rotor shaft, a pinion (13) mounted on the drive shaft and movable in a translational movement between a rest position and an active position by a movement system.; Furthermore, the starter motor comprises a coupling system (30) that couples a rotary movement in one direction of rotation of the rotor shaft (5) to the pinion (13), the coupling system (30) being able to move from an uncoupled state into a coupled state and vice versa, in which, in the coupled state, the rotor shaft (5) is firmly attached to the pinion (13) in the direction of rotation of the starting, and in which in the uncoupled state, the pinion (13) is disconnected from the rotor shaft (5) in both directions of rotation. The starter motor further comprises a movement system for moving the pinion (13) from its rest position into the active position and vice versa, moving the coupling system (30) into the uncoupled state as it moves the pinion into the active position.

Description

technical field [0001] The present invention relates to a booster starter motor for a heat engine, in particular a motor vehicle, equipped with a pinion fitted in a freely rotating relationship to the shaft of the starter motor, and to the coupling of the pinion to the starter motor pinion. [0002] In order to start the thermal engine of the vehicle, it is known to use a starter motor capable of transmitting mechanical energy to turn the crankshaft of the motor through the intermediary of a gear. To achieve this, the starter motor includes a pinion mounted on a drive shaft driven in rotation by the motor rotor. The pinion is provided with teeth designed to engage with the teeth of a toothed wheel coupled to the crankshaft of the motor. [0003] The invention is particularly advantageous when applied to vehicles equipped with a stop and start function of a thermal engine (described later), which vehicles are equipped with a booster starter motor. The term power starter moto...

AI Technical Summary

Problems solved by technology

However this mounting makes the motor flywheel less compact

[0010] The second flaw is a worn or oversized section in the transmission line between the crankshaft and the rotor of the starter motor due to the mechanical constraints of the balancing stage

[0012] Furthermore, in the event of freewheel wear during the balancing phase, the rotor may turn in the opposite direction, which could destroy or permanently wear the operating lever feeding the rotor

[0013] Finally, the third flaw is excessive consumption

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