Bridgestone Bridgestone launches the basics of motorcycle tires on the official website detailing the various aspects of tires. This time, it introduces the difference between motorcycle and automobile tires and the characteristics of motorcycle tires. Analysis of the force when the motorcycle turns
The body leans in the direction in which it wants to turn, and the tires have a camber angle (the body will tilt in the direction of the steering).
Why is the section of the motorcycle tire round?
First of all, let's first study how the car turns. When the car turns, it uses the "slip angle of the tire to generate the steering force" to drive the car to turn, so when the steering wheel turns to the direction of turning, the car body It will start to turn in the direction that you want to turn, but because the centrifugal force will affect the car body, the car body will tilt toward the outside of the steering.
In contrast, motorcycle tires use "the lateral force of the tire's camber angle", which is called "camber thrust" (described later) to drive the car to turn, then the motorcycle The body of the car will tilt in the direction you want to turn and then turn.
Therefore, compared with the tire for automobiles, the tire shape of the motorcycle is circular in order to obtain a large angle of camber angle and a small radius of the tire cross section.
Analysis of the force when turning a car
Turn the steering wheel to the direction you want to turn to produce a side slip angle (the body will tilt toward the opposite side of the direction of rotation).
What is the extraversion thrust?
Try to imagine a disc-shaped object such as a 10-round coin and then roll it. The disc will turn in a slanting direction. At this time, the center line of the disc will produce a right-angled (inward) force. This is the camber. Thrust, and the camber thrust will increase simultaneously with the camber angle (the tilt angle of the wheel).
Generally, the camber angle of the car and the body will vary by ±0.5° (+ is the tire to the outside of the car, and the tire is inclined to the inside of the car body). The motorcycle body has a maximum of 45°-50°. The angle of change.
In addition, the camber angle of a general car cannot be changed while traveling, but the motorcycle is riding with the knight changing the camber angle in the case of turning, which means that in order to make the camber of the motorcycle at the turn Importantly, the design of motorcycle tires is mainly to actively use the camber thrust, which in turn produces the steering force.
Extrapolation thrust analysis
Analysis of the camber thrust generated by the camber angle
Steering force from camber thrust and side slip angle
In order to steer the vehicle body, it is necessary to generate centrifugal force and corresponding steering force when steering, that is, the camber thrust caused by the camber angle of the vehicle body, but sometimes the side slip angle of the tire is required according to the state of the turning. Bring steering power.
Since the camber angle (the tilt angle of the vehicle body) determines the magnitude of the camber thrust, it is necessary to increase the chamfer angle of the handle when the camber force alone does not generate sufficient steering force compared to the centrifugal force during cornering. Thereby a side slip angle is generated to enhance the steering force.
Motorcycle tire shape
Motorcycle tires are designed to have no significant change in the ground contact area at any angle of inclination, either straight or forward. The reason for this is that when the ground contact area becomes larger or smaller as the inclination angle becomes smaller, it is impossible to bring stable road grounding property, and the grip force is sometimes weakened and sometimes weakened, and it becomes extremely unstable.
The shape of the tire for motorcycles is designed such that even if the tire is tilted, the ground contact area hardly changes much, and the stable grip can be maintained smoothly.
This is one of the reasons why the cross-sectional shape of the motorcycle tire is designed to be more round than the tire for the automobile.
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