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What is the function of the transmission interlock device?

1 Answers

StKathryn

07/29/25 10:20pm

The function of the transmission interlock device is to prevent automatic gear shifting or gear disengagement during vehicle movement, where gear disengagement refers to the gear shifting back to neutral. The interlock device consists of interlock steel balls and interlock pins. The gear shift lock device of a manual transmission includes: a self-locking device; an interlock device; and a reverse gear lock device. The self-locking device is used to prevent the transmission from automatically disengaging or engaging gears and ensures full tooth width engagement. The self-locking device is composed of self-locking steel balls and self-locking springs, with three grooves distributed axially on the upper surface of each shift fork shaft. When any shift fork shaft moves axially along with the shift fork to the neutral or a working position, one groove will align precisely with the self-locking steel ball. Under the pressure of the spring, the steel ball embeds into the groove, fixing the axial position of the shift fork shaft, thereby securing the shift fork along with the sliding gear (or coupling sleeve) to prevent unintended disengagement. The reverse gear lock requires the driver to apply greater force to the gear lever to engage reverse gear, thus serving as a warning to prevent accidental engagement of reverse gear.

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