Gear Shift Shaft

We also offer our customers precision designed and constructed Gear shift shafts that are part of synchronized transmission and are presently being exported for use in Gear Box Assembly of 6 Wheeler trucks of IVECO (Hungry). These gear shift shafts find usage in a synchronized gear box that are used in most of modern manual-transmission vehicles and allow functioning of transmission gears in mesh and rotating forms. The shafts also allow gears on one shaft to freely rotate or locked to shaft using collar locking mechanism where the shaft slide sideways so that teeth present on its inner surface bridge two circular rings with teeth present on outer circumference where one is attached to gear and other is attached to the shaft. When rings are bridged by collar, particular gear is locked rotationally to shaft and helps in determining output speed of transmission. Further, gearshift lever manipulates collars using set of linkages arranged in a manner where one collar is allowed to lock only one gear at a single time and while shifting gears, locking collar gets disengaged from one gear and engages another. Hence, a single solar serves needs of two gears where sliding in one direction helps in selecting the transmission speed and sliding in other direction selects another. Component action performed in Synchromesh Gearbox:
In synchromesh gearbox the action process of components is as described below:
  • For correctly matching speed of gear to the shaft as gear is engaged, collar initially applies force to cone-shaped brass clutch attached to gear
  • This brings speeds to match prior to collar locking into place
  • Collar is prevented from bridging locking rings when speeds are mismatched by blocker rings
  • Synchromesh ring has slight rotation because of frictional torque from cone clutch
  • In this position, dog clutch is not allowed to engage
  • As clutch ring slowly causes parts to spin at same speeds, there is no more torque present from cone clutch and dog clutch is allowed to get engaged
Some of the factors like free play or excess friction in path between gear-stick and gearbox can be a starting point of problems and disturb its normal smooth functioning. Some of the areas that contribute to the problems include:
  • Bushes deterioration at base of gear-stick where cables attach
  • Shift cable damages due to heat or crushing of protective sleeve
  • Free play present in rod ends joining to translator assembly
  • Translator bearing seizure because of dirt and seepage of water
  • Seizure in rod ends of tie rod assembly anchoring translator to support bracket
  • Seizure of cross shaft support bearing
  • Application : Exported for Gear Box Assembly of 6 Wheeler trucks
  • Component part of : Synchronized transmission
Item NameGear Shift Rail
Customer NameZF Hungary