| 摘要 |
PURPOSE: Oil leak preventive structure of a multiple driving hammer bit is provided to prevent oil from being leaked and impurity from being infiltrated with closed sealing in a multiple drive bit housing. CONSTITUTION: Bearing sleeves(3,3') are formed to cover a shaft bearing(2) combined around bearing grooves(1b,1b') in both sides of a main shaft(1). Sealing grooves(3a,3a') are formed in the circumference of the bearing sleeves, and closed sealings(4,4') made of elastic material are combined with the sealing grooves. Sealing guides(5,5') having curved sealing contact faces(5a,5a') are formed in both sides of the bearing sleeves. Outflow preventive sealings(6,6') made of elastic material are combined with the sealing contact faces of the sealing guides. Lubricating oil is prevented from being leaked against impact for long hours by filling with liquid oil or grease in gel type according to selection of a user.
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