| 摘要 |
PURPOSE: To provide light weight and durability and isolate a bearing inner part from the environment by forming first lip parts, second lip parts smaller than the diameter of the outer circumferential face of it and a case into an integrated device out of polymer. CONSTITUTION: This enclosure is provided with first lip parts 32 connected to a case 30, having outer circumferential faces 62 faced to a rotary shaft, end faces 62 at an angle to the shaft, and wedge-shaped cavities 66 meeting with the outer circumferential faces 60 at the corners and opening from the outer circumferential end faces 60, 62 so as to cover the corners between two faces. It is further provided with second lip parts 34 having sealing edges 72 generally projecting from the first lip parts 32 in the axial direction in the opposite direction of the openings of the cavities 66 from the end faces 62 and applied so as to contact with the seal face of diameter smaller than the diameter of the outer circumferential face 60 on the first lip part 32, and this enclosure is constituted so that the case 30, the first lip parts 32 and the second lip parts 34 are molded as an integrated device essentially formed out of polymer. |
