What is the primary function of a CV joint?

The primary function of a Constant Velocity (CV) joint is to allow for drive axle flexibility and accommodate rotational angles while transmitting power from the engine to the wheels. This is particularly important in front-wheel drive vehicles and those with independent suspension systems, where the drive axle must adapt to changing angles as the vehicle moves over bumps or turns.

The CV joint enables the drive shaft to maintain a constant speed without significant loss of power, regardless of the angle at which it is operating. This ensures smooth power delivery and helps in maintaining vehicle stability during motion. The design of the CV joint allows for a greater range of motion compared to traditional universal joints, making it ideal for modern automotive applications that require flexibility in the drivetrain.

In contrast, other options do not relate to the function of a CV joint. Providing power to the fuel system pertains to components like fuel pumps and injectors, while air circulation in the engine is related to the cooling system. Tire grip is influenced by factors such as tire design and road conditions, not the function of axles or joints.