Speed reduction unit for traveling crane and cart

The invention relates to a speed reduction unit for a traveling crane and a cart. The speed reduction unit comprises a plurality of speed reducers and frequency converters. Each speed reducer is a second-level transmission mechanism and mainly comprises a high-speed shaft, a first gear set, an intermediate shaft, a second gear set and an output shaft, wherein first-level transmission is formed through cooperation of the first gear set, the high-speed shaft and the intermediate shaft, second-level transmission is formed through cooperation of the second gear set, the intermediate shaft and the output shaft, and the second-level transmission mechanism has a transmission effect of a national standard third-level speed reducer. According to the speed reduction unit for the traveling crane and the cart, the second-level transmission speed reducers are adopted, the structure is simple, and the speed reduction unit is not prone to damage under the high-load work condition; and the manufacturing cost is reduced, the transmission efficiency is higher, and production is stabilized.