Gear Shift Quality Enhancement Parameters in Light Commercial Vehicles

Abstract

In the present scenario enhancements of human ergonomics in Light commercial vehicles are imperative to implement customer comfort in vehicle level. Thus the gear shift mechanism plays an important role in the interface between the driver and vehicle. An exact and smooth running gear shift feel typically depends on the combination of both internal and external shifting elements of the gearbox and Change shift operation(CSO) system. The objective of this paper is to explain the parameters that impacts the gear shift quality and how it is improved by taking multiple design iterations in Light commercial vehicle platform through both objective and subjective evaluations. These iterations are given better results on gear shift feel in dynamic as well as static condition. This lead us to facilitate better shift comfort to end users. The content of the paper is limited to the scope of gear shift quality improvements at manual transmission and change shift operation components.

Keywords: Gear shift Quality, Synchronizers, Gear engagement, Gate Selection, Cross Shift, Detent, External Shift system, Internal Shift System, Counter Balance, Vibration damper, Cable liner, Load Efficiency, Stroke efficiency, No load sliding resistance