What are manual transmission synchronizers? Newsletter Signup First Name: As an output pulley , the driven pulley transfers energy to the driveshaft. One of the pulleys, known as the drive pulley or driving pulley , is connected to the crankshaft of the engine.
The combinations of gears are carefully chosen so the engine can remain in its best rev range for either power, torque turning force or efficiency. The second pulley is called the driven pulley because the first pulley is turning it. These flexible belts are composed of several typically nine or 12 thin bands of steel that hold together high-strength, bow-tie-shaped pieces of metal.
How an automatic gearbox works A normal automatic gearbox uses gears to match engine speed to road speed.
Related Topics Powered by System1. Enter CVT , or continuously variable transmission. Well, yes it is, but not entirely. Each pulley is made of two 20-degree cones facing each other. So the standard automatic is somewhat compromised because the engine has to pick from only a few gear ratios.
Photo courtesy Nissan Global Pulley-based CVT Peer into a planetary automatic transmission, and you'll see a complex world of gears, brakes, clutches and governing devices. Robert Pepper Robert Pepper is a motoring journalist, offroad driver trainer and photographer interested in anything with wings, sails or wheels. V-belts are preferred if the belt is made of rubber.
This feels and sounds like the clutch is slipping in the car, or an automatic transmission gone wrong. And automakers also go to a lot of trouble to smooth out the gearchanges as well as make them faster. The result is a smoother, more efficient and quicker drive than an normal automatic.
What this means for the driver is that the engine can go directly to the best rev range for a given situation. In all of these applications, the transmissions have relied on high-density rubber belts, which can slip and stretch, thereby reducing their efficiency.