Electric folding device for exterior rear-view mirror of vehicle

An electric folding device for exterior rear-view mirror of a vehicle comprising:

• a housing (1), connected with a mirror base plate;
• a base (2), the base (2) is fixedly connected with the housing (1), and a base cam assembly (2.1) is disposed on a lower end surface of the base (2);
• a seat (3), the seat (3) is fixed on a mirror bracket, and a seat cam assembly (3.1) is disposed at an upper end of the seat (3);
• the base cam assembly (2.1) and the seat cam assembly (3.1) are in engaged state in an initial state;
• a mounting shaft (6), the mounting shaft (6) is fixedly connected with the seat (3), and the base (2) and the housing (1) rotate around an axis of the mounting shaft (6) relative to the seat (3), and a spring (7) is disposed on the mounting shaft (6);
• an electric drive unit (4), comprising a motor (4.1), a transmission assembly (4.2) and a drive gear (4.3) disposed in an inner chamber of the housing (1);
• wherein it further comprises:
• a centralized connection piece (5), and the centralized connection piece (5) is provided with a mounting portion (5.1) for the drive gear (4.3) to slide circumferentially;
• a limiting seat (5.2) is integrally disposed on an upper part of the mounting portion (5.1), the spring (7) is abutted against an upper end of the limiting seat (5.2), and the drive gear (4.3) is abutted between the limiting seat (5.2) and the base (2);
• a first reserved gap (8) is formed between the limiting seat (5.2) and the drive gear (4.3) with a plurality of limiting convex blocks abutting against each other;
• a second reserved gap (9) is formed between the base (2) and the drive gear (4.3) with a plurality of limiting convex blocks abutting against each other;
• driven by the electric drive unit, the abutting of each group of limiting convex blocks is released by sliding the drive gear (4.3) circumferentially along the mounting portion (5.1) of the centralized connection piece (5), and driving the base cam assembly (2.1) to slide relative to the seat cam assembly (3.1), and the second reserved gap (9) is firstly eliminated and then the first reserved gap (8) is eliminated until the base cam assembly (2.1) is opposed to the seat cam assembly (3.1) to realize an upward lift of the base (2).