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Technical Paper

New Gear Locking Design in Synchromesh Gearbox Which Reduces Gear Shift Effort

2014-09-30
2014-01-2328
This paper introduces a new design for the synchromesh gear boxes, which serves dual purpose of economizing the production cost and time of the gears manufacturing and enhancing the shift experience by reducing the shift effort. This is achieved by making changes in the “Entry chamfers” which are the angles placed on the shift sleeve and gear dog teeth, and the “Back Taper Angle” also placed on the shift sleeve and gear dog teeth. In the new design the “Entry chamfer angles” is reduced from 120° (in the existing design) to 90° and is made “Un-symmetric” from “Symmetric”. This help in reducing the shift effort, hence enhancing the shift experience by making it smooth. Another change is the “Back Taper Angle”, which is eliminated from the sleeve and the gear dog teeth and is repositioned on the hub, keeping all other important design parameters like strut / insert design, gear cone angle, gear cone finish, number of cones, cone friction material the same.
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