What are the layout forms of automotive transmission systems?
1 Answers
Automotive transmission systems have the following layout forms: 1. Front-engine, rear-wheel drive—FR: This is a traditional layout where the engine is placed at the front and the rear wheels are driven. Most trucks, some sedans, and some buses, both domestically and internationally, adopt this layout. 2. Rear-engine, rear-wheel drive—RR: In this layout, the engine is placed at the rear, and the rear wheels are driven. It is commonly used in large buses, with a few micro and light sedans also adopting this form. The rear-engine placement prevents the front axle from being overloaded, maximizes cabin space utilization, effectively lowers the floor height or utilizes the space under the middle floor for luggage storage, and reduces the impact of engine heat and noise on the driver. 3. Front-engine, front-wheel drive—FF: In this layout, the engine is placed at the front, and the front wheels are driven. This configuration features simple control mechanisms and good engine cooling conditions. However, during uphill driving, the vehicle's weight shifts backward, reducing the adhesion weight of the front drive wheels and making them prone to slipping. During downhill braking, the weight shifts forward, overloading the front wheels and increasing the risk of rollover at high speeds. Most sedans today use this layout. 4. Mid-engine, rear-wheel drive—MR: The engine is placed between the front and rear axles, with the rear wheels being driven.
