How A Gearbox Transmission Works

To understand how a gearbox-engaged transmission works, the reader should first become acquainted with the names of the essential components and what they do. Regardless of the complexity of today's manual transmissions a series of basic components will be applied. These include; a clutch, gear selector, fork, various shafts, a collar, dog-teeth and a gear set. So, here we go;

Clutch - This is a foot activated device that allows the gearbox, and subsequently the transmission as a whole to engage, or disengage the engine to a car's driving wheels. When the clutch is depressed the engine freewheels momentarily allowing the driver to move the;

Gear Selector - This is a hand operated device that allows a driver to choose a gear that in-turn creates a match between engine RPM and a particular gear ratio. When the selector is moved it exercises a;

Fork - This is a connecting device that accepts forward and backward movement between the gear selector and the fork by use of a horizontal rod. It is secondarily connected to a vertical rod mated to a collar. When the selector/fork combination is moved it exercises the;

Collar (Also known a "dog ring") - This is a rotating component that slides across a horizontal shaft connected to the car's differential. The purpose of the collar is to positively engage a selected gear. When the collar is excited it causes a connection between collar and gear by utilizing a group of;

Dog Teeth - These are extruded features around the collar that creates a connection between collar and gear by inserting these features into holes around a gear. When the collar/gear combination is secured the system spins up, causing power synchronization between the engine, transmission, differential and the final drive, also known as the driving wheels.

While today's manual transmission appears to be a highly complex mechanism, in general the difference between a basic two-gear system and its more sophisticated siblings is based on the number of components, rather than the enhanced sophistication of the components themselves.

For example, in a typical five-gear system a clutch with single gear selector operates three forks, and these multiple "connectors" activate three dog rings. When the driver moves the gear selector forward or backward, or left or right (based on the gearbox pattern) the particular fork excites one of various clusters of gears based on a range of fixed gear ratios. Selection of these ratios is dependent on the physical position of the selector, i.e. straight up for first, straight down for second, over to the right and up for third etc. Traditional use of this design approach is based on the most efficient way to generate available engine power to the ground.

Regardless of the configuration, however, understanding a manual system is fairly straightforward process now that the reader knows all the names and understands how they work.