Patent ID: 8534921

Claim:
A marine drive shaft-bearing structure comprising: a bearing body disposed between an engine and an impeller; a bearing member received in a bearing chamber within the bearing body for rotatably supporting a drive shaft for connecting the engine with the impeller, a bearing shaft being defined by sealing between the drive shaft and the bearing body; and a grease filling portion which is adapted to fill grease into the bearing chamber comprising: a grease filling port formed in the bearing body for communication with the bearing chamber; a grease tank for storing the grease therein, the grease tank having a neck with a through hole and an outer male threaded portion; a connection-threaded portion having an outer circumference formed in a polygonal shape, a female threaded hole which opens upwardly for directly threadedly connecting to the male threaded portion of the grease tank, and a bottom portion with a hole smaller than the female threaded hole; a first cylindrically-shaped connection tube having an upper end inserted into the through hole of the neck of the grease tank, a central portion passing through the hole in the bottom portion of the connection-threaded portion, and a lower end detachably, threadedly connected to a threaded portion of the grease filling port, thereby detachably connecting said grease tank to the grease filling port, wherein the outer male threaded portion of the neck of the grease tank has a length in an axial direction that is longer than a length of a portion of the first cylindrically-shaped connection tube inserted into the through hole of the neck.