This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
輨 combines 車 (vehicle) with 官, which likely contributes the sound. The exact historical development is uncertain.
The left side 車 suggests a vehicle, and the right side 官 looks like an official. Picture an official's vehicle, but its exact purpose is unclear.
For カン, imagine a can-shaped hubcap on the official's vehicle: can -> カン.