What is the name of this component (green)?

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The green component in question is identified as a type of ratchet mechanism, specifically a ratcheting freewheel mechanism. It allows gears to turn freely in one direction while engaging in the opposite direction. The design is based on the deflection of the ratchet rather than a traditional pivoting arm-and-spring style. There are options for plastic freewheels available commercially, or they can be custom fabricated. The specific design details of the component remain uncertain.
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what is the green component? what is the name?
 

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I don't know the name for that specific device, but it is a type of ratchet mechanism.

Edit: To further classify this, one might call it a ratcheting freewheel mechanism. The one thing of which I'm unsure how to classify, is that the ratchet mechanism is based on the deflection of the ratchet, rather than a pivoting arm-and-spring style mechanism.
 
i found the photo on google. I am looking for a plastic gear component that allow gear to turn freely in one direction, but engage in opposite direction. do u have any idea?
 
I'm sure someone makes plastic freewheels, or you could easily have it fabricated for you. As far as that specific design, I don't know.
 

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