Trailer wheel assembly for station of cleaning machine

The invention discloses a trailer wheel assembly for a station of a cleaning machine. A wheel sleeves a roller bearing, the roller bearing sleeves a roller shaft, and the right end of an end cover abuts against the left end of a bearing outer ring. The right end of the bearing outer ring abuts against the right end of the inner wall of the wheel, the left end of a bearing inner ring abuts againstthe left end of the roller shaft, and the bearing outer ring is in rolling connection with the bearing inner ring through a roller. The roller shaft penetrates through a trailer support and abuts against the bearing inner ring, a locking nut is in threaded connection with the roller shaft, an oil channel is horizontally formed in the roller shaft and communicates with the roller shaft in an open-close mode, the left end of the roller shaft is radially provided with one or more radial oil outlets, bearing oil holes corresponding to the radial oil outlets are formed in the roller bearing, and the wheel is in rolling con