Overrun clutch

The invention overcomes the defects that early failure and shorter service life of the existing overrun clutch are caused by proneness of a folding spring to wearing, and relates to an overrun clutch comprising an inner cam, a left baffle and a right baffle. A plurality of raceways are evenly distributed on the peripheral surface of the inner cam. Opposing sides of the left baffle and/or the right baffle are provided with barrier parts extending over the raceways, and each barrier part is located at the connection of each two adjacent raceways. The rear end of each folding spring is provided with a bent part extending backwards, and the lower portion of each barrier part is provided with a clamp part for clamping the bent part of the folding spring. The folding springs of the overrun clutch are fixed through the bent parts, the upper and lower portions of each folding spring are suspended, and accordingly no wearing occurs, the folding springs are effectively protected from damage due to frictional interferen