| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a venting device which prevents an invasion of moisture or the like, or a leak of grease from a ventilator, and also prevents an interior from becoming negative pressure by absorbing an inner pressure variation of bearing housing. <P>SOLUTION: The venting device comprises: an internal lid 13 which closes the ventilator 5c of the bearing housing, and includes an inner recess 13b dented in an internal direction of the bearing housing 5 with respect to an external surface 13a1 of periphery 13a; an external lid 14 which is arranged on an external surface side of the internal lid 13, and includes an outer recess 14b dented in an external direction of the bearing housing 5 with respect to an internal surface 14a1 of periphery 14a; and a filter component 15 which is sandwiched between the peripheries 13a and 14a of both lids 13 and 14, respectively, and consists of polytetrafluorethylene porous membrane arranged between the both lids. This filter component 15 partitions an internal space K surrounded by both recesses 13b and 14b into an internal space K1 and an external space K2. In the internal lid 13, an inside hole 13c is formed as communicating the internal space K1 and an interior of the bearing housing 5, and in the external lid 14, an outside hole 14c is formed as communicating the external space K2 and an exterior of the bearing housing 5. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
