Crank arm
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United States of America Patent
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May 12, 2015
Grant Date -
Jan 8, 2015
app pub date -
Jul 8, 2013
filing date -
Jul 8, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A crank arm is provided, which includes a first connecting member and a second connecting member used for joining the first connecting member. The first connecting member has a first wall surface, the first wall surface is provided with a joint wall of an annular structure, and a wall surface of the joint wall is a concave-convex surface. The second connecting member is provided with a second wall surface opposite to the first wall surface, an annular wall and two facing ribs extend from the second wall surface, and the annular wall and the ribs have a groove there-between for fitting the joint wall therein. Therefore, a contact area of the first connecting member and the second connecting member is increased, and a shear force resisting function is provided.
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