Importance

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Abstract

The fan blade is used for a cooling fan assembly to be coupled to the shaft of a motor for rotation about an axis. The fan blade has a curved leading edge and a curved trailing edge with an outer edge which defines an arc between a forward position and a rearward position. The fan blade leading edge is forwardly swept in the region from 0.5R.sub.L to the forward position wherein R.sub.L is the length of a straight line from the axis to the forward position. The swept angle .alpha..sub.L formed by lines extending from the axis to the blade leading edge at 0.5R.sub.L and to the forward position is at least 35 degrees. The camber ratio calculated by H.sub.L /L.sub.L is larger than 0.10 but less than 0.20. The blade trailing edge is also forwardly swept in the region of 0.5R.sub.T to the rearward position wherein R.sub.T is the length of a straight line from the axis to the rearward position. The swept angle .alpha..sub.T formed by lines extending from the axis to the blade trailing edge at 0.5R.sub.T and to the rearward position is at least 30 degrees but less than 40 degrees. The camber ratio H.sub.T /L.sub.T is larger than 0.10 but less than 0.20.

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First Claim