A starter for an internal combustion engine

F - Mech Eng,Light,Heat,Weapons – 02 – N

Patent

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Details

F02N 15/02 (2006.01) F02N 11/00 (2006.01) F02N 15/00 (2006.01)

Patent

CA 2230683

In a starter (1) for an internal combustion engine comprising a planetary gear type reduction gear unit (2) and a housing (17) for accommodating at least the reduction gear unit (2), a recess (51) is formed at a lower part (17a) of the housing (17) in an installed state of the starter (1) in a manner that the recess (51) is formed in an inner periphery of the housing (17) so as to define a drain passage (51) extending substantially axially, and a part (52) of an outer periphery of a first annular member (12), which constitutes a part of the reduction gear unit (2), protrudes into the recess (51). Thus, the protruding part (52) of the outer periphery of the first annular member (12) forms a labyrinth structure in the drain passage (51) defined by the recess (51) formed in the inner periphery of the housing (17), to thereby effectively prevent water from entering the housing (17) through the drain passage (51) without substantially impeding the passage of water from the housing (17) to the outside. This protruding part (52) is integrally formed in the first annular member (12), and therefore no additional component parts are required to make the labyrinth structure.

Cette invention concerne un démarreur (1) de moteur à combustion interne qui comprend un réducteur à train planétaire (2) et un carter (17) qui loge au moins ledit réducteur (2) et comporte dans la partie inférieure (17a) de sa périphérie intérieure une gorge (51) formant une voie d'évacuation (51) sensiblement axiale une fois le démarreur (1) installé. Un premier élément annulaire (12) faisant partie intégrante du réducteur comporte sur sa périphérie extérieure une pièce (52) qui s'emboîte dans la gorge (51) pour former un labyrinthe dans la voie d'évacuation (51) définie par la gorge (51) ménagée dans la périphérie intérieure du carter (17), labyrinthe qui a pour effet de bloquer efficacement l'entrée d'eau dans le carter (17) par la voie d'évacuation (51) sans pour autant s'opposer sensiblement à l'évacuation de l'eau du carter (17) vers l'extérieur. La pièce en saillie (52) fait partie intégrante de l'élément annulaire (12), d'où la non nécessité de faire appel à d'autres pièces pour constituer le labyrinthe.

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