The so-called automobile transfer case literally means that its main purpose is to distribute the power of the engine to the front and rear axle devices. Therefore, the transfer case is actually a standard accessory for four-wheel drive vehicles. According to the different types of four-wheel drive, there are several types of transfer case, such as traditional part-time four-wheel drive transfer case, full-time four-wheel drive transfer case, timely four-wheel drive transfer case and super-selective four-wheel drive transfer case.