FACTOID # 20: Statistically, Delaware bears more cost of the US Military than any other state.
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
People who viewed "Gearbox" also viewed:


FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:



(* = Graphable)



Encyclopedia > Gearbox

A gearbox is an assembly of gears allowing the rotational speed of an input shaft to be changed to a different speed. Often, more than one gear ratio is provided, and a mechanism for selecting among the ratios is provided. The most common form of gearbox encountered in everyday life is that of a car with a manual transmission.

A modern car gearbox is of the constant mesh or synchromesh type, in which all gears are in mesh, but only one of which is locked to the shaft on which it is mounted at any one time, the others being allowed to rotate freely. This type of gearbox avoids the problems of wear and damage caused by bringing moving gears into mesh, however, it has higher frictional losses than the simpler type.

Heavy trucks and machinery usually are fitted with a simpler type of gearbox, known colloquially as a "crash gearbox". Here, the selected gear is brought directly into mesh, and any others are not involved. Driving a vehicle with such a gearbox requires considerable skill, including mastering the technique known as double declutching.


In a synchromesh gearbox, gears can freely rotate or be locked to the shaft on which they are carried. The locking mechanism consists of a sliding collar which bridges between two circular rings with teeth on them - one travels with the gear, one with the shaft. When the rings are bridged, the gear is locked to the shaft. To correctly match the speed of the gear to that of the shaft as the gear is engaged, the collar initially applies a force to a cone-shaped clutch which is attached to the gear. This spins the gear up or down in speed to match the shaft prior to engagement of the collar. The collar is prevented from bridging the locking rings when the speeds are mismatched by baulk rings. The gear lever manipulates the collars using a set of linkages, so arranged so that only one collar may be permitted to lock a gear at any one time. In a modern gearbox, the action of all of these components is so smooth and fast it is hardly noticed.

  Results from FactBites:
Gearbox Software - (378 words)
Gearbox software is looking for an Animation Producer to organize and drive the animation needs for an upcoming 3D action title.
Gearbox Software is looking for a full-time tools programmer with strong usability and interface development experience to join our applications development team.
Gearbox software is looking for 3D Artists to create environment, vehicle, and prop models for an upcoming 3D action title.
Gearbox Software - (153 words)
Gearbox Software is an independent, award-winning developer of interactive entertainment responsible for best-selling titles on all major gaming platforms.
Check out Gearboxity, Gearbox Software's official community site for all the latest news on Gearbox's most recently announce project Samba de Amigo!
Updated weekly with news and special features, Gearboxity is your source for inside information about our games, our company, and our great online community.
  More results at FactBites »



Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m