Starter for an internal combustion engine

Abstract

The present invention relates to a starter (1) for an internal combustion engine (2), comprising a support (4), an electric motor (5) which is arranged on the support(4)and which serves for driving apinion (7) in rotation, and a solenoid drive (6) which is arranged on the support (4) and which serves for the axial adjustment of the pinion (7) between active position (AS), which is provided for the drive of a gearwheel (3) of the internal combustion engine (2), and a passive position (PS), which is axially offset with respect to the active position (AS), wherein the solenoid drive (6) has a plunger stop(20) which is static with respect to the support (4), a plunger (21) which is axially adjustable relative to the plunger stop(20), and a cylindrical coil arrangement (22) which is arranged on the plunger stop(20) and which surrounds a cylindrical coil interior (25) of the coil arrangement (22) in a circumferential direction, wherein said coil interior (25) extends axially from a proximalend portion (62) of the coil arrangement (22) to a distal end portion (63) of the coil arrangement (22), wherein the plunger stop(20) has a cylindrical section (27) which projects from the distal endportion (63) axially into the coil interior (25), and wherein the plunger (21) is arranged axially opposite the cylindrical section (27) of the plunger stop(20) and, in the active position (AS)of thepinion (7), protrudes from the proximal end portion (62) axially into the coil interior (25) of the coil arrangement (22). Reduced wear of the pinion (7) and / or the gearwheel (3) can be realized by extending the cylindrical section (27) of the plunger stop (20) into the coil interior (25) such that a face end (33) of the cylindrical section (27) is in the area of the proximal end portion (62).

Description

technical field [0001] The invention relates to a starter for an internal combustion engine, which has the features of the preamble of claim 1 . Background technique [0002] A starter of the described type comprises a support, an electric motor arranged on the support and intended to drive the pinion in rotation, and an electric motor arranged on the support for the pinion in active and passive positions. ), the active position is provided for the drive of the gear of the internal combustion engine, and the passive position is axially offset relative to the active position. A solenoid driver comprising a plunger stop fixed relative to a support, a plunger axially adjustable relative to the plunger stop, and a cylinder arranged on the plunger stop and surrounding the coil arrangement in a circumferential direction A cylindrical coil assembly inside a circular coil. Furthermore, the plunger stopper has a cylindrical portion protruding into the inside of the coil in the axia...

AI Technical Summary

Problems solved by technology

Also, the annular groove is retained and causes the field lines in the plunger to deflect even when the plunger has been retracted inside the coil, thus reducing the available magnetic force

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