| 摘要 |
PURPOSE: A filter cap including a filter is provided to improve a production yield by passing external air through a cylindrical cover to a hollow body and the inside of a housing without providing a separation piece generating a deformation to the bottom of the cylindrical cover. CONSTITUTION: A filter cap comprises the following: a first hollow body(10) including radially protruded ring units(10a,10b) on the upper and the lower side of the outer circumference; a filter(40) filtering foreign materials from external air while being attached to seal a hollow unit(10c) formed in the lower center of the first hollow body; a first diameter unit(20a) and a second diameter unit(20b); a user-cylindrical cover(20) formed with screw processing unit(21) in the inner circumference of the second diameter unit; a first outer diameter unit(31) and a second outer diameter unit(32); plural through-holes(31a) on the first outer diameter unit; another screw processing unit(35) on the second diameter unit; and a second hollow body(30).
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