Patent ID: 6869381

Claim:
A gearbox device comprising: a housing formed with first and second hole-confining wall portions; an input shaft mounted rotatably in said first hole-confining wall portion; an output shaft mounted rotatably in said second hole-confining wall portion and having a nut mounted thereon; an output bearing disposed in said housing for mounting rotatably said output shaft in said second hole-confining wall portion, said nut retaining said output bearing in said housing; a first oil seal unit mounted in said housing to provide a liquid tight seal between said input shaft and said first hole-confining wall portion; and a second oil seal unit mounted in said housing to provide a liquid tight seal between said output shaft and said second hole-confining wall portion; wherein at least one of said first and second oil seal units includes an annular rubber seal member, and an annular ceramic member disposed radially and inwardly of said rubber seal member, said ceramic member being in contact with said rubber seal member and being fixed to a corresponding one of said input and output shafts, said ceramic member being disposed around and being connected fixedly to said nut, said rubber seal member being fixed to a corresponding one of said first and second hole-confining wall portions.