· The idler gear (sometimes called “reverse idler gear”) sits between the reverse gear on the output shaft and a gear on the countershaft. The idler gear is what allows your car to go in reverse. The reverse gear is the only gear in a synchronized transmission that isn’t always enmeshed or spinning with a countershaft gear. Image: 5-speed manual transmission power flow – 2nd gear engaged. The reverse gear contains an extra gear in order to change the direction of rotation of the output shaft. The reverse gear doesn’t have a synchronizer since the reverse gear is engaged after the vehicle has come to a complete stop. Now let’s see how the reverse gear works? The reverse gear uses a 3-gear arrangement, as shown. Out of those, one is the idle gear. Fig The three gear arrangement of a reverse gear. It is clear that addition of one more gear will turn the output shaft gear in the reverse direction.
How does a manual transmission work? to effect a gear change, selecting first gear, for example, the driver depresses the clutch, disengaging the input shaft. using the shift lever, the driver selects first gear, and the linkage moves the shift fork to connect the 1 st 2 nd locking collar with 1 st gear, locking it to the output shaft. The Reverse Gear. Now let’s see how the reverse gear works? The reverse gear uses a 3-gear arrangement, as shown. Out of those, one is the idle gear. Therefore, it would be impossible to throw the transmission into reverse while the car is moving forward; the dog teeth would never engage. However, they will make a lot of noise. Synchronizers. Manual transmissions in modern passenger cars use synchronizers, or synchros, to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact.
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