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Different Types of Suspensions

  • Author :
  • TATA AIG Team
  • Last Updated On :
  • 10/09/2024

Enjoying the drive quality and comfort of your car is one of the key aspects of owning a car. When the quality of your drive is impacted, there can be multiple aspects at play.

One key aspect that significantly impacts the drive quality and vehicle comfort is the type of suspension system installed in your car model. There are different types of suspension systems installed in vehicles that focus on specific driving performances as required.

Understanding these systems can help you make informed decisions about your vehicle's maintenance to ensure optimal comfort, performance and maintenance of your vehicle's health.

What Is A Suspension System?

A car's suspension system stabilises and controls the vehicle's drive, ensuring smooth handling over bumps and dips on the road. It consists of components like coil springs, shock absorbers, struts, control arms and ball joints.

A suspension system absorbs road impacts and maintains tyre contact with the road, which enhances steering stability.

Here are some of the most common, yet important components that are required in most suspension systems:

Ball Joint- The ball joint serves as a rotation axis which helps smooth out the rotational forces at play when a car turns. This component ensures that the wheels move in sync with the steering input, which provides precise control and enhances safety during manoeuvres.

Coils or Springs- Coils or springs absorb shocks and compress according to the vehicle’s load. They work in sync with dampers and prevent body roll which is crucial in high-speed turns to stop the car from toppling. By distributing the vehicle’s weight evenly, coils contribute to a balanced and comfortable ride.

Damper or Shock Absorber- The primary function of a damper or shock absorber is to absorb shocks from the road and bumps. By converting the kinetic energy that is transferred from the wheel to the frame into heat energy, dampers prevent the car from bouncing. These are filled with oil to stay cool and cut out vibrations which enhances the ride quality and stability.

Knuckle Arm- Also known as the steering arm, the knuckle arm connects the suspension to the wheel. It acts as a meeting point for these critical systems. It plays a vital role in maintaining the alignment and stability of the wheels which helps ensure effective sterling response and overall vehicle control.

Types Of Suspension

There are two main types of suspension systems:

  • Dependent Suspension System

  • Independent Suspension System

The dependent suspension systems are better for handling heavy loads, while the independent suspension systems allow each wheel to move separately for improved comfort and control. Regular inspection and maintenance of the suspension system are essential for safety and performance.

Beyond the two main types, there are different types of suspension systems available with specific features, sometimes focusing on the strut for braking and steering systems or springs to support better weight.

Here are some of the most popular and reliable suspensions used by automakers:

Rigid Axle Suspension System

The rigid axle suspension system, also known as a solid axle suspension, is a conventional suspension system known for its reliable performance, especially in heavy-duty vehicles. This type of suspension is particularly used in trucks, SUVs and off-road vehicles.

The rigid axle suspension system features a single, solid axle that connects the wheels on either side, ensuring that the movement of one wheel directly affects the other. Supported by components like leaf springs, coil springs and shock absorbers, the rigid axle provides robust and reliable performance.

The primary function of rigid suspension is to support and evenly distribute the vehicle's weight, enhancing stability and traction, especially in off-road conditions. Its simplicity results in lower manufacturing and maintenance costs, making it cost-effective for heavy-duty applications.

While it offers durability and load-bearing capacity, it may not provide the smooth ride or precise handling of independent suspension systems. Despite this, its ability to endure challenging conditions and support heavy loads make it a preferred choice for specific vehicles.

Leaf Spring Suspension System

The leaf spring suspension system is an enduring design that is vital in heavy-duty and commercial vehicles. It comprises layers of steel arranged in a stack to provide robust support and durability. This design efficiently handles substantial loads, making it ideal for trucks and trailers.

One of the primary advantages of leaf springs is their ability to offer a reliable and simple solution for heavy load management. They excel in providing a stable and balanced ride, which is crucial for maintaining vehicle performance under significant weight. Leaf springs also contribute to a straightforward and cost-effective suspension system that is easy to repair and maintain, particularly in multi-leaf configurations.

Despite their advantages, leaf springs are less suited for high-speed driving or sharp cornering due to their inherent stiffness and limited comfort. However, their strength and load-bearing capacity make them indispensable for vehicles that prioritise durability and functionality over ride comfort.

Double Wishbone Suspension

The double wishbone suspension, commonly found in high-end sports and supercars, is popular for its superior handling and ride quality. This system uses two wishbone-shaped arms, also known as A-arms, positioned at the top and bottom of each wheel.

This design allows for better control over camber, caster, roll centre and wrestling to enhance stability and agility, especially during fast cornering. As the suspension compresses, it introduces more negative camber, which maintains optimal tyre contact with the road, significantly improving the handling.

Additionally, the double wishbone setup offers greater flexibility in damper placement, often leading to the sophisticated inboard setups seen in racing cars. Unlike the MacPherson Strut, this suspension type allows for softer damping without compromising on tyre contact, which provides a more comfortable ride even on bumpy roads.

The design also conserves vertical space, which allows for reasonable suspension travel without raising the vehicle's ride height. This helps keep the centre of gravity low and further enhances the handling. Despite its complex nature and higher costs, the double wishbone suspension is favoured for its exceptional performance and comfort.

MacPherson Strut Suspension

The Macpherson strut suspension is widely used in modern cars for its simplicity and cost-effectiveness. This suspension design features a compact yet robust and reliable structure that combines a strut with a control arm, creating a strong and versatile setup for the front wheel. One of its key advantages is its affordability. Manufacturers greatly appreciate the low production costs indicated by this system.

Additionally, the Macpherson strut provides excellent space efficiency, which allows for more room in the vehicle's engine bay and interior. This design also contributes to improved handling and stability, especially when tuned for performance applications.

The MacPherson strut suspension's adaptability and ease of integration with unibody chassis systems further enhance its appeal. Overall, the MacPherson strut balances strength, practicality and manufacturing efficiency making it a preferred choice for many automakers.

Trailing Arm Suspension

Trailing arm suspension is a system in which two large trailing arms pivot at the front end, which is attached to the car body, while the rear end is rigidly fixed to the wheel.

This design supports the coil spring on the arm's upper surface, which allows the wheel to move only up and down to absorb bumps. This controlled movement helps provide a smoother ride by efficiently handling road irregularities.

The trailing arm suspension is primarily used on the rear end of vehicles, including motorcycles. It offers simple yet cost-effective suspension solutions. The system's design ensures that the wheels do not experience lateral movement or camber change relative to the car body, which helps maintain stability.

However, pure trailing arm suspensions are less common today due to their tendency to induce understeer during cornering. When the car rolls into a corner, the trailing arm follows the car body's roll, which causes both wheels to lean outward.

Despite this limitation, trailing arm suspension remains a reliable choice that provides the benefit of reliable and straightforward rear suspension for vehicles and motorcycles.

Multi-Link Suspension

Multi-link suspension is a sophisticated system that comprises multiple arms that work together to control a car’s wheel movement in various directions. It typically involves at least three lateral arms and one longitudinal arm which ensures precise control over the wheel's vertical, lateral and longitudinal movements.

One key advantage of this suspension system is its ability to maintain optimal tyre contact with the road which enhances grip and stability.

The independent movement of each wheel allows for superior ride quality and handling which makes it particularly effective in absorbing large bumps without compromising on the cornering performance of the vehicle.

Multi-link suspension can also be fine-tuned to adjust individual suspension parameters without significantly affecting others. This offers flexibility in achieving the decided handling characteristics.

Air Suspension

An air suspension system, also known as a pneumatic suspension system, employs air springs or airbags instead of traditional metal springs to support a vehicle’s axles. These airbags, made of textile-reinforced rubber or plastic, contain compressed air that allows for customisable vehicle height adjustments.

One of the main advantages of air suspension is its ability to provide a smoother ride by absorbing road shocks and vibrations more effectively than conventional suspension systems.

Moreover, air suspension systems offer hassle-free height adjustments which enhance ride quality and stability across different road conditions. They also extend the operational life of the vehicle by reducing wear and tear from road impacts. This type of suspension maintains consistent ride height which ensures better handling and overall safety.

Furthermore, the improved shock absorption capabilities of this suspension lead to better fuel economy and a more comfortable driving experience, even on poor roads. Air suspension is a popular choice in modern vehicles due to its delivery of a superior blend of comfort, durability and adaptability.

Conclusion

Understanding the different types of suspension systems is crucial for car owners who value ride quality and driving performance. Each suspension type, from the robust and reliable rigid axle suspension system to the diverse and adaptable air suspension, offers unique benefits that are tailored to specific driving needs and conditions.

Since one size fits all does not apply to car parts, knowing the suspension type of your vehicle can help you get the targeted maintenance the system requires. This not only ensures that the health of your vehicle is maintained but also eliminates the stress of having to diagnose what is wrong with your vehicle's performance in case of notable drive issues.

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FAQS

Are there any disadvantages to using a double wishbone suspension?

Since double wishbone suspensions are complex and heavy structures, if they are damaged, their maintenance can be very expensive and time-consuming. These suspension systems always need a skilled mechanic to replace or repair damaged or worn components.

Which is the most economical suspension system?

The MacPherson strut is the most economical suspension system. It combines comfort and control with low manufacturing costs and also has a smiler design. It can also be easily modified to suit different vehicle requirements.

Is there a disadvantage to using an air suspension system?

Since air suspensions rely on air and inflatable rubber bellows, they can get punctured or improperly inflated, which can significantly impact performance. A puncture can even make the car undrivable.

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