Universal joint pin assembly for prolonging service life of universal joint

The utility model relates to a cross shaft assembly for prolonging the service life of a universal joint, which belongs to the technical field of universal joints and comprises a cross shaft, a shaftsleeve movably nested with the cross shaft in a sealing manner is arranged on the cross shaft, a plurality of rolling needles are arranged between the shaft sleeve and the cross shaft, a dust cover isarranged between the opening of the shaft sleeve and the cross shaft, and an oil seal is arranged between the dust cover and the rolling needles. A compression spring washer is arranged between the oil seal and the roller pin, and an oil injection nozzle is arranged at the upper end of the cross shaft. The shaft sleeve comprises a shaft sleeve raceway, the shaft sleeve raceway is provided with ashaft sleeve middle micro-arc-shaped groove which is integrally concave with the shaft sleeve raceway, and a shaft sleeve near-root micro-arc-shaped groove is formed between the shaft sleeve middle micro-arc-shaped groove and t