Oiling structure and oiling method for cross shaft assembly

The invention discloses a cross shaft assembly oiling structure and an oiling method, and belongs to the technical field of coupler equipment. The universal joint pin comprises a universal joint pin body provided with a pin head; the shaft head comprises an oil injection shaft head, a first oil injection nozzle, a second oil injection nozzle, a third oil injection nozzle and a fourth oil injection nozzle which are independently connected with external oil supply equipment are arranged on the end face of the oil injection shaft head, and the first oil injection nozzle, the second oil injection nozzle, the third oil injection nozzle and the fourth oil injection nozzle are correspondingly connected and communicated with the first bearing, the second bearing, the third bearing and the fourth bearing respectively. And the first oil injection nozzle, the second oil injection nozzle, the third oil injection nozzle and the fourth oil injection nozzle respectively supply oil to the first bearing, the second bearing, t