How a synchronized manual transmission works.

This is a video showing how a four speed, fully synchronized transmission works.

Category:

Education

Tags:

• manual transmission
• synchronized transmission
• Constant mesh transmission
• synchronizers
• constant mesh transmission

[sgtgrizzo]

your better than my teachers at UTI

[Karlisplayhouse]

@sgtgrizzo Whoa "sarg". Thanks for the complement! Great appreciation.

[Saskachewan]

Very good explanation. But I still don't get it how that synchronizing thing works. And I have one more question: Why one gears have straight teeths and others have skew teeths? What's the purpose of skewing teeths in gears?

[Karlisplayhouse]

@Saskachewan Re the Synchronizing: Does it help to think of it as a clutch that gets the gears spinning so that they synchronize (are going the same speed) can engage? The skewed toothed gears are called helical gears. They stay in contact longer, have more surface area contact for strength, run smoother than straight gears, and as I recall are quieter. Hope this helps. Thanks.

[Karlisplayhouse]

@TheDarqTurk If you mean the syncro-rings, they usually ride on a cone shaped part of the steel gear. Though there are others that are held in place via a splined part of the gear assembly. This explanation might not be too clear, but when you get into rebuilding your transmission, I think that it will be clear to you.

Thanks (all) for looking and for your good feedback.

[toxicbmx1]

Is it hard to fix the first gear syncro Thingy?

[Karlisplayhouse]

@toxicbmx1 No it's not if you have the necessary tools (such as snap ring pliers), have a good place to work so you can keep everything clean, and if you are dexterous with you fingers. There are some springs and things that can be a little tricky. if you are going to the trouble of opening the transmission up, may as well replace the rest of the synchros and anything else that is worn. Usually one would buy a rebuild kit with all of the usual parts but it is a judgment call. Thanks

[xtclink]

Great!! Absolutely Great explanation 

[Saskachewan]

So why not all gears are made like that? Some of them are still straight-toothed.

As to the sync: it quite helps, but there are still some missing pieces: If it's like a clutch, then what if I switch the gears too fast? Is it possible for them to not have enough time to sync? And there are some strange teeths in the sync rings which can offset a bit. I still don't get their purpose and how do they do they job. Here's some explanation: watch?v=HlLHtnEVAi8 but I don't get it.

[GrlzzIy]

great video man. This is what youtube should be all about, the spreading of knowledge.

[rahmyafify]

thx

[rookerzzz]

interesting. Small gear box on the old volvos, strange though, cause it has teh saem components of a modern car. This must be a 4 speed, yea?

[rdsbbhatia]

thanks u man, gr8 work. U almost cleared all my doubts on gear shifting mech. Wish u a successful career..Ol the best