countershaft

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coun·ter·shaft

 (koun′tər-shăft′)
n.
An intermediate shaft between the powered and driven shafts in a belt drive.

countershaft

(ˈkaʊntəˌʃɑːft)
n
(Mechanical Engineering) an intermediate shaft that is driven by, but rotates in the opposite direction to, a main shaft, esp in a gear train
References in periodicals archive ?
The 8DT includes two countershafts and one summation shaft.
Differential output was routed through a pair of countershafts whose outboard-mounted bull-pinion gears engaged a pair of axle-mounted large-diameter bull gears located in the cast iron, drop-box-style final drive housings.
A popular solution is to spread the gear sets over three, instead of the usual two, countershafts, trading length for width.