how to play two animations of one gameobject without reducing the weight or any speed

Hi, guys,

I have a machine showing in below picture: The machine has two parts, one is red-marked and the other is yellow-marked, each of them has an animation, and both are controlled in one Animator, and now I play one of them, say: AnimationA, and sometime later I want to also play AnimationB.

I have tried several ways, like: build two Animator Layers or make a Blend Tree, but both of them have the problem that when playing one of the them, the other animation will get less playing. Because it is not a Humanoid gameobject, I want the animation to play without any influences by the other.

Maybe I had misunderstood about the Animator Layers or the Blend Tree, if anybody can give me ideas that will be really helpful and appreciated. Thanks.