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 cylinder is located at the rear of the trailer's running axles to provide the trailer with a large angle of 45 or 60 degrees, depending on the model, to the pivot that is connected to the countershafts in the middle of each axle.
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.
Common to transverse powertrain applications is the use of two countershafts to reduce packaging length.
The 8DT includes two countershafts and one summation shaft.
As a result of the new look, the Lightning transmission uses a single integrated gear package with main and auxiliary countershafts sharing the same axial centerline and support bearings, eliminating a significant amount of iron.