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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.
THE LONG AND WINDING LOAD
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.
Row crop tractor revolution: International Harvester's McCormick-Deering Farmall led the way
A popular solution is to spread the gear sets over three, instead of the usual two, countershafts, trading length for width.
The golden age of gears: transmissions finally earn their day in the sun. (Transmissions)
The 8DT includes two countershafts and one summation shaft.
ZF, Porsche and the 8DT
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.
LIGHTNING STRIKES FOR EATON

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