Guest Blogger: Street Rod 101
Often in the street rod or custom car industry, the term “four bar” linkage is used. What does it mean to have a four bar linkage, and where are they used on street rods, custom cars, or hot rods?
Solution: A four bar linkage is a system often used in steering and suspension system design. An easy way to understand such a linkage is to look at the simplified illustration to the left. Note there are four links called link (a), link (b), link (c), and link (d). Each of these four links connects together by pivot points. Link (a) is considered to be stationary or
non-moving, such as the frame of a vehicle. Link (b) is considered the “input” or drive on the system. As link (b) is moved, as shown by the small green arrow, it moves link (b) and (c) in a circular motion. The direction of motion is shown by the red dotted circle. Since both link (b) and (c) are the same length, they will move in the same direction shown by the red dotted circles.