Reverse gear
| Guest |
Friday, September 28, 2007 at 1:50 PM |
Why does the reverse gear in a car go "whangnnnngggaaaaannnnggnnnaaaaanngngnanngnggngaanngngngnannnnnggngngnnaaaaaaaaaaaaaaaaannng" and all the forward gears are quiet?
| Guest |
Tuesday, October 30, 2007 at 3:13 PM |
Also because the reverse gear is a higher ratio gear than any of the forward gears thefore spins more than the others adding to the noise.
| Guest |
Thursday, November 22, 2007 at 10:21 AM |
Because the reverse gears' teith stand inline with their axis. So they lock into each other head on, tooth after tooth. Which u can hear clearly. Forward gears are not straight, more like 60° on the axis. So they lock into each other very fluently.
| Guest |
Thursday, November 22, 2007 at 10:22 AM |
More like 15° i mean,, 60° would be impossible
| Guest |
Sunday, August 3, 2008 at 1:42 AM |
last ones right,the gears are straight cut for reverse,angled for forward gears.Thats why rally/racing cars boxes make the noise going forward because their forward gears are straight cut as well because it makes stronger gears.
| Guest |
Thursday, April 29, 2010 at 5:26 AM |
sorry to argue but straight cut gears are actually weaker and so less reliable, whearas helical gears (forward angled gears you talked about) are stronger and so more relible and quiter, which is why they are used as mainstream gears, with a straight cut spur gear as reverse because they do not need to be as strong and they are cheaper to produce. straightcut spur gears are used in racing boxes because if you are good then you can get a quiker change with straight cut spur gears, and in racing reliability does not matter, components only need to last the endurance of the race.
| Guest |
Thursday, April 29, 2010 at 5:40 AM |
sorry just to add to my above post: helical gears are stronger because there is a bigger surface area of contact between two gears because they are angled from there axis. this larger surface area means the load force is distributed over a larger area meaning it can cope with the load better (not got a great knowlege of these technicalitys) but you can also get double helical gears where the teeth meet in the middle and then angle in opsite ways from the axis making them even stronger. (Dont know if that explains in a way you can understand very well, im used to fixing them not explaining!)
| Ogri |
Monday, July 19, 2010 at 8:19 PM |
Did ye all forget about synchromesh?
Modern manual gearboxes contain a diagonal gear that sits side by side with the main gears and ensures that the sliding gear is synchronized with main gears. This synchronization allows the sliding gear to seamlessly engage with the main gears and prevents the gears from clashing with one another, which can damage the transmission. Modern gearboxes contain two sliding gears, one of which engages exclusively with the reverse main gear. This second sliding gear is constantly synchronized with the reverse main gear and allows the operator to seamlessly shift from forward to reverse.
Specifically the way the teeth in the reverse gear are shaped. The forward gears in your transmission are helically shaped, meaning the individual teeth on the gear are curved rather than straight but reverse has straight cut teeth.
Why is straight noisier than helical? A helical gear's teeth are always in contact with the next gear thanks to their shape. Picture two straight gears moving very slowly. There's a split second that you'll see space between the teeth. The continuous tiny tapping of the gears remaking contact with each other creates the whine you hear. Since a helical gear has long, curved teeth, the point at which two gears meet is never out of contact, so no tiny taps, and no noise.
| Guest |
Wednesday, August 9, 2023 at 5:12 AM |
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