Low-energy-consumption needle roller thrust bearing retainer and electronic parking system

The utility model discloses a low energy consumption thrust needle roller bearing retainer and an electronic parking system, which comprise an annular frame body, a groove is concavely arranged on the frame body along the radian of the frame body, a group of windows used for arranging needle rollers are uniformly distributed in the groove, the windows are radially arranged by taking the axis of the frame body as the center, and the windows are arranged in the groove. The roller pin is provided with a window, the window is composed of two symmetrically-arranged first side edges and two symmetrically-arranged second side edges, the first side edges and the second side edges are perpendicularly arranged, the two first side edges are located on the groove edges of the groove respectively, and the first side edges are in point contact with the two ends of the roller pin. According to the utility model, the first edge side of the window is arranged to be arc-shaped, so that point contact is formed between the first