“…The optimized Rocker‐Bogie mechanism (D. Kim et al, 2012) uses the front bogie lifting the front wheels to achieve the stair height. TurboQuad (Lin et al, 2017), Turbo‐Leg compound robot (Zhou et al, 2019), LDR (Bai et al, 2018), and Turbo‐Leg robot (Ning et al, 2017; Sun et al, 2017) use linkages to turn wheels into legs to climb steps or stairs. The parallel robot designed by Li et al (2018) connected the wheels through the bars into a closed loop, which “multi‐wheel‐bar connection” fragments step‐climbing motion into simple repetitive action.…”