(57) An air filter (10) includes a filter core (12) and a base (13). Outer air is filtered
by the filter core (12), and then flows to the base (13), which has a passageway provided
in its center and connected with an air intake of an engine. An air concentrating
tube (133) is provided on the upper end of the passageway, extending in the inside
of the filer fore, having an upper end with a large opening, gradually shrinking down
to have a lower end with a trumpet shape. The large upper end of the air concentrating
tube can permit filtered clean air to flow smoothly through into the passageway (134)
so that no turbulent current may happen in the air filter and filtered clean air may
flow in an engine smoothly for boosting effectiveness of burning in the engine.
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