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What is the Function of a Differential Lock?

2 Answers

DeVivienne

08/29/25 6:08am

The function of a differential lock is to lock the differential. Below are relevant introductions about automotive differential locks: 1. Classification of locking methods: Different differentials employ different locking methods. Currently, common differential locks mainly include the following types: forced locking, high-friction self-locking, jaw-type, Torsen-type, and viscous coupling. 2. Working principle: When one driving wheel slips, the differential lock secures the differential housing and the half-shaft as one unit, causing the differential to lose its differential function. This allows all torque to be transferred to the other driving wheel. The differential lock effectively addresses the issue of power transmission when one side of the car's wheels slips, which means locking the differential.

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StRiley

09/11/25 3:48am

The core function of a differential lock is to force the left and right wheels to rotate synchronously. During normal turns, the difference in wheel speeds is managed by the differential. However, on muddy or icy roads, if one wheel slips and spins freely, all the power is wasted on the spinning wheel. Engaging the differential lock makes the left and right wheels rotate and stop together as if they were welded, allowing the good tire to push the vehicle forward. I often use this feature to get unstuck during off-roading, but remember never to engage it on paved roads, as it can wear out tires and damage the driveshaft during turns.

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