Semi-synchronized ??

Posted by jdemaris on April 03, 2006 at 18:16:09 from (66.218.23.85):

In Reply to: Synchronized vs. Non Synchronized Transmission?? posted by '53 VAI Guy on April 03, 2006 at 07:03:19:

I know there are no synchronizers in my VA,VAH or VACs. They all shift fine, and double-clutching isn't necessary. It's just a matter of proper timing and knowing when to shift. When I was a teenager, I drove several gas-powered road tractor-trailers for a moving company - Brockways. They were the same way and often needed double-clutching.
In regard to a "semi-synchronized", I don't know what that is. A syncrhonized transmisson, by nature of design, is usually weaker than a non-synchro. That because a non-synchro uses sliding gears that come in or out of mesh when you shift. That's why they clash unless you time things right, and make sure they are turning the same speeds when you shift - so the teeth slide together instead of fighting each other.
A synchronized transmission is usually referred to as a Constant-Mesh trans - that because the gears never move when you shift. There are lock collars that are secured to a shaft - and have small teeth that lock on to a gear when you shift. So, you are actually shifting the lock-collars, not the gears. Along with that, there is usually some sort of clutch - disk or brass cones - that makes the lock-collars turn the same speed as the end of the gear they need to lock on to. These are the synchro-clutches. Usually, these synchronizer lock collars have small teeth and nowhere near the surface-area of a sliding-gear - that's why they are not usually as strong. But nowadays, seems they've gotten beefed up a bit along with better alloy-steels since just about everything seems to be synchronized.
There are some "in-between" transmissions that do NOT use sliding gears, but have sliding lock-collars instead - but NO synchronizers. Deere for example, called this their "collar shift" or CSS transmission. Maybe this is what you are calling a "semi-synchronized" trans.?

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