Starter for cranking an internal combustion engine having a pinion shaft support

Abstract

The invention relates to a starter (2) for cranking an internal combustion engine, in particular a cantilevered starter (2), having an electric starter motor (6) which has a drive shaft (10) which is provided with an external toothing system (42, 44), a pinion shaft (16) which carries a pinion (20), and a clutch part (28) of a roller freewheel clutch (12) which is arranged between the drive shaft (10) and the pinion shaft (16), has an internal toothing system (46) which meshes with the external toothing system (42, 44) of the drive shaft (10) and can be displaced together with the pinion shaft (16) away from the starter motor (6) in the axial direction of the drive shaft (10) into a starter pinion position (Figure 2), in which the pinion (20) meshes with a gearwheel or crown gear of the internal combustion engine. In order to load the roller raceways (52, 54) of the roller freewheel clutch (12) to a less pronounced extent as a result of the radial forces which act on the pinion shaft (16) in the region of the pinion (20) during cranking of the internal combustion engine, a device (60; 64) is provided for supporting the pinion shaft (16) directly on a section (42), facing away from the starter motor (6), of the external toothing system (42, 44) of the drive shaft (10).

Description

technical field [0001] The invention relates to a starter for starting an internal combustion engine according to the preamble of claim 1 , in particular a boom starter. Background technique [0002] Electric starters for starting internal combustion engines often employ so-called screw drive starters. Such a starter has a starter motor, the drive shaft of which drives a pinion shaft displaceable in the axial direction within the starter housing, which supports the pinion outside the housing. The drive shaft has an external gear in the form of a high-pitch thread which meshes with a complementary internal gear of a clutch part of the roller overrunning clutch which is movable together with the pinion shaft. After starting the internal combustion engine, the roller overrunning clutch prevents the starter motor from being driven by the internal combustion engine at too high a speed and thus being damaged. To start the internal combustion engine the starter is switched on, th...

AI Technical Summary

Problems solved by technology

As a result, the opposing roller tracks formed on the pinion shaft and clutch part are locally heavily loaded, which leads to premature wear of the roller tracks and thus to a shortened service life of the overrunning clutch and starter

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