Mechanical Basics

What is Steering Mechanism?

Steering Mechanism is the combination of the links and pairs that results in the movements and responsible for the changing the directions of a vehicle. Steering is the guiding system of the machine or automobile to achieve required direction or to turn the automobile to the required side.

So the mechanism that is used to steer or change the direction of the vehicle is called Steering Mechanism in Automobile.

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What can we learn from this post?

  • What is Instantaneous Centre?
  • Types of Steering Mechanism.
    • What is Ackerman Steering Mechanism?
      • Advantages of Ackerman Steering Mechanism
    • What is Davis Steering Mechanism?
      • Advantages of Davis Steering Mechanism
  • Conclusion

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As we know that the mechanism is achieved by many links so, the front wheels are fixed to the hub and to the axles whereas; the links are joined with the help of joint called Pin Joint or Pivots. When a vehicle wants to take a turn towards one side; due to the pin joint, the front wheels along with axle rotate according to the requirement.

Steering Mechanism in Automobile, Types of Steering Mechanism, and Advantages

While turning, the front wheel of the respective side, turns with a greater angle than the wheel of the other side. In order to avoid skids, the front wheels must turn about the same Instantaneous Center “I” which lies on the axis of the back axle.

A fundamental equation of the steering mechanism is derived to find whether the applied mechanism is suitable and effective to use. The fundamental equation is

Steering Mechanism in Automobile, Types of Steering Mechanism, and Advantages

The equation will not remain same and it will change according to the types of steering mechanism.

What is Instantaneous Centre?

Instantaneous center is defined as the center where the translation and rotation of all mechanism or links lies. In the above image, we can observe that the instantaneous center lies at the back axle axis.

The condition for correct steering is that “all the four wheels must turn about the same instantaneous center.”

Types of Steering Mechanism:

There are two different types of steering mechanism in automobile. They are 

  1. Davis Steering Mechanism.
  2. Ackermann Steering Mechanism.

Let us read about these two types of steering mechanism in automobile and its equation.

What is Davis Steering Mechanism?

Davis Steering Mechanism is one of the mechanisms in steering that consists only sliding pairs, it means the pairs in the mechanism will slide while steering the vehicle. The fundamental equation of this mechanism is satisfied in all the position.

In this mechanism the instantaneous point or centre is achieved at centre of the wheel base (l). Therefore, the equation becomes

Steering Mechanism in Automobile, Types of Steering Mechanism, and Advantages

In Davis Steering Mechanism, we need to apply more effort to turn the vehicle because the mechanism is a sliding type.

Advantages of Davis Steering Mechanism:

  • Davis Steering Mechanism satisfies the fundamental equation at all the positions and turns instead of sticking to few turns.
  • We can say that Davis Steering Mechanism is an exact mechanism of steering.
  • The construction is easy.
  • The whole power of driver is converted to the wheels while turning.

What is Ackermann Steering Mechanism?

Ackermann Steering Mechanism is another type of mechanism that have turning pairs and no sliding pairs as like Davis Steering Mechanism; due to this turning pairs, the Ackermann Steering Mechanism requires less effort compared to Davis Steering Mechanism.

In this type of mechanism, the fundamental equation can be satisfied only at 3 positions of the Automobile. The three positions are as follows;

  • While the vehicle moves along a straight path.
  • While the vehicle is steering to the left at a correct angle.
  • While the vehicle is steering to the right correct angle.

The mathematical equation of this mechanism is given as  

Steering Mechanism in Automobile, Types of Steering Mechanism, and Advantages

Advantages of Ackermann Steering Mechanism:

  • Due to its turning pairs, it requires less effort to operate.
  • It acquires less wear and tear problems.
  •  

Conclusion:

Mechanisms are the main important things that responsible for most of the movements in machines and automobiles. It plays important role in automobiles also when it comes to steering mainly. All the steering types that are following now-a-days are based upon Davis and Ackermann Steering mechanisms.

The technology is advanced and even the steering types also. Now-a-days, power steering (we will discuss in upcoming articles) is using in the automobiles and resulting a good efficient and easy steering.

 

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