The axle is the still centre around which wheels turn, read as the core that holds a life together. A broken axle points to a central support that feels strained.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.