Nikon d7000 Did i damage my auto Focus?

I have a nikon d7000 with an 18-105mm lens, and i was wondering, when i have it in auto focus(on the camera body and the lens) sometimes i manually focus it(i do this because i had an olympus e3 and it could manually focus in auto) My question is if i have everything in autofocus and i accidentally turn the manual focus ring a bit, is it enough to damage the auto focus motor or it it really hard to Break the auto focus motor
if it help i have manually focused in auto a few times{when i do accidentally manual focus i usually make the focus ring do a full rotation before i realize that its in auto)
in case you forgot my question is if i have everything in autofocus and i accidentally turn the manual focus ring a bit, is it enough to damage the auto focus motor or it it really hard to Break the auto focus motor

You should refrain from doing this with the 18-105mm lens.

Some of the higher end Nikon lenses can indeed be focused manually when the lens is in autofocus mode, but those lenses have a focusing switch marked as M/A-M. M/A means autofocus with manual override. If the switch just has an A then it is autofocus only.

Lenses such as your 18-105mm that are only marked A-M on the switch can't - or should not - be manually focused in autofocus mode.

You will not damage your camera though as the 18-105mm lens uses it's own internal focus motor. But you could damage the lens.

This lens supports manual focus override, so you will be fine. Usually, when a lens shouldn't be focused manually in AF mode, you will feel a strong resistance when you try to focus, and trying to keep turning the focus ring will break the motor or strip a gear in the lens/body.

@AWBoater - With all due respect, I looked at the PDF manual for this lens on the Nikon website, and it stated (on page 15) that "Manual focusing is possible even when the lens A-M mode switch is set to A," as long as you do not try to move the focus ring while the AF system is moving it.