Starter motor with idle gear

Abstract

The present invention provides a starter motor with an idle gear, wherein a helical spline part (61) is formed on a drive shaft (32) rotated by a motor (11) through a planetary gear mechanism (12) and an over-running clutch (13) movable in the axial direction is mounted thereon. A pinion (14) meshing with the idle gear (15) is formed integrally with the clutch inner (57) of the over-running clutch (13). A feeding flange (72) engaged with the idle gear (15) and disengaging the idle gear (15) from a ring gear (16) according to the axial movement of the pinion (14) is formed at the tip of the pinion (14). The bottom outer diameter of the gear part (71) of the pinion (14) is smaller than the outer diameter of the clutch inner (57), and the pinion (14) is formed integrally with the feeding flange (72) and the clutch inner (57) by cold forging. Thus, the starter motor simply formed, manufacturable at low cost, having high reliability and capable of engaging and disengaging the gear with and from the ring gear can be provided without increasing the number of parts.

Description

technical field [0001] The present invention relates to a starter motor mounted on an engine of an automobile, etc., and more particularly to a mechanism for controlling engagement and separation between an idler gear in the starter motor and a ring gear of the engine. The idler gear in the starter motor is rotationally driven by an electric motor, Can move in axial direction. Background technique [0002] Engines used in automobiles, motorcycles, large generators, etc. are generally started by a starter motor (starter motor) mounted on the engine. As such a starter motor, as disclosed in Patent Document 1, an idler pulley movable in the axial direction is provided. The idler gear is provided so as to be meshed with and disengaged from the ring gear of the engine, the two gears are meshed when the engine is started, and the meshing is released after the engine is started. Also, the idler gear meshes with a pinion gear rotationally driven by the starter motor, and the pinio...

AI Technical Summary

Problems solved by technology

That is, in the conventional starter motor, in order to push the idler gears 101, 113 into the ring gears 105, 121 or pull them out, a dedicated special mechanism is provided, which has the problems of increasing the number of parts, increasing the assembly man-hours, and increasing the cost.

[0014] In addition, the parts for moving the idler wheel are easily subject to a large impact when the engine is started, and are also subject to sliding action caused by high-speed rotation after the engine is started, so there is also a problem that parts are easily damaged or worn.

Moreover, especially in the structure shown in FIG. 5, since the mechanism for moving the idler wheel is large, there is also a problem of increasing the overall size of the starter motor.

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