Principle: There are many explanations about the wooden ox and the flowing horse. One explanation is the single-wheeled wooden cart, which is a wooden human walking cart with a swinging container and is used to transport granular goods on mountain roads.
Wooden bull's head: the carriage of a four-wheeled vehicle is equipped with a bull's head, and the two shafts are mounted on the front and rear pillar shafts. The long and short struts are hinged on the strut shafts, and the two shafts are hinged on the vehicle body, and the wheels are rotated by shaking the two shafts to support the ground.
Horse-riding: The carriage of a two-wheeled vehicle is equipped with horse heads, and the front and rear strut shafts are equipped with two shafts. The long and short struts are hinged on the strut shafts, and the two shafts are fixedly connected with the vehicle body. The wheels are rotated by shaking the two shafts to support the ground.
Extended data:
Cattle herding Liu Ma was a means of transportation invented by Zhuge Liang, prime minister of Shu and Han Dynasties in the Three Kingdoms period, which was divided into cattle herding and Liu Ma. It was used by Zhuge Liang in the Northern Expedition from the 9th to 12th year of Jianxing (23 1-234). Its carrying capacity is "one-year-old grain", about 400 kilograms, and its daily journey is "dozens of treks, three miles in groups", providing food for 100 thousand troops in Shu and Han dynasties.
References:
Baidu Encyclopedia-Mu Niu Liu Ma