sled
輴 centers on a vehicle for sliding over snow or ice: a sled. The meaning is narrow and concrete.
輴 combines 車 (vehicle) with 盾, which likely contributes the sound. The character is rare and its exact historical development is uncertain.
A vehicle 車 with a shield-like 盾 shape on the right: imagine a sturdy sled built like a shield, sliding over snow.
For チュン, picture a sled pulled by a team of huskies, and the driver calls out 'Chun!' to make them go: Chun -> チュン.
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