What is the Half-Clutch State?

1 Answers
CoreyLee
07/29/25 12:24pm
Half-clutch state refers to the semi-engagement state, where the clutch is not fully engaged, resulting in an uncertain connection between the engine and the transmission. In this state, there is relative sliding between the components, and a speed difference exists between the input and output shafts. The engagement process of the clutch consists of three stages: free travel, working travel, and idle travel. The working travel is further divided into initial engagement, semi-engagement, and full engagement. When the driving and driven friction plates of the clutch first make contact, it is called initial engagement. When they are partially but not fully and reliably engaged, it is called semi-engagement, and complete contact is termed full engagement. After full engagement, the vehicle operates normally, followed by the idle travel stage. The semi-engagement state causes significant wear to the clutch, and most clutch damage occurs during this phase. Therefore, it is generally advisable to avoid keeping the clutch in the semi-engagement state whenever possible.
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