What Is Lower Arm Car: Here's An Explanation, Type, And How It Works

Photo illustration. (Doc. Hardrace)

YOGYAKARTA - In the car suspension system there are various components that support the performance of the system, including the lower arm of the car. Then what is the lower arm of the car? Is there a big enough role? How does this component work? Come on, know the answers to all these questions by observing the following discussion.

As previously explained, lower arm is one of the components of the car suspension system. As is known, the car suspension system is a system that functions to protect the comfort of passengers and drivers while driving. This system will reduce the vibrations and surprises produced when the car passes through damaged or less flat roads. The success of the suspension system's performance is influenced by several components in it listed lower arm.

In the automotive group itself, lower arm is also known as the lower swing arm because it is installed under the frame of the car. Lower arm itself in the car has a different design depending on the type of suspension used. For a double wishbone type suspension, generally the lower arm design is shaped to resemble the letter A. For macpherson-type suspensions, it generally resembles the letter L. As well as for the suspension used for the usual vehicle, the lower arm is shaped to resemble the letter I.

In the car suspension system, lower arm has quite important roles and roles. There is also a role as follows.

1. Control Wheel Movement

Lower arm has a major role, namely controlling wheel movement. Starting from the top or bottom movement, as well as moving forward or backward. In controlling this movement, lower arm will synergize with the upper arm. In the condition of the moving car, the upper arm will protect the position of the wheel so that it fits into the position set. On the other hand, lower arm plays a role in stabilizing the wheel when the car is driving.

2. Support Knuckle Arm

Next, the lower arm plays a role as the supporter of the knuckle arm. Because, the lower arm can be said as a container for the knuckle arm. As is known, the knuckle arm is a component of the suspension of the car which is located on the front of the car wheel. To be precise, between the tires and the wheels that are connected to the car brake component and the hub.

Through a ball joint embedded in a lower arm, the brake, wheel, and knuckle arm components will be supported. That way, the knuckle arm can move more freely because it is not directly connected to the lower arm.

Although not directly connected, knuckle arm still requires a lower arm in holding the weight of the car to stabilize the movement of the wheel.

4. Ensuring that the Wheel of the Car TURNs in tandem

Lower arm on the car also has other roles that are no less meaningful, namely ensuring the wheels turn in a row. Lower arm will ensure the movement of the wheels in rhythm when they turn according to the steering angle and the left wheel of the car. If the car is driven to turn right then the car can freely turn according to the steering direction. This also applies when the car turns left.

The lower arm work method is fairly complex. When the car is traveling on an uneven road, it will cause vibrations and shock effects. The vibrations and shock effects will be absorbed by a lower arm using the help of a low arm bushing (vibrational damping series). When the car turns, the lower arm will keep the suspension geometry maintained so that the wheels are aligned and do not cause friction on the car tires massively.

Given the fairly large role of lower arm in protecting the safety and comfort of driving, lower arm conditions must always pay attention. You always pay attention when the car is loose, the front seat emits the sound of fire, a rough sound appears under the car, a heavy car steering wheel, until the brakes are shocked. This is a sign that the lower arm is damaged and must be replaced quickly.

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