Hmmm.. transmission theory in 100 words or less
Each gear position on the shifter, has a corresponding pair of gears that
couple and decouple. One of these gears slides and locks into the other
gear, using protrusions on the face of sliding gear to lock into holes on
the face of the fixed gear... these protrusions are know as "dogs" and are
present in both "dog" boxes and "synchromesh" boxes.
A synchromesh box, has a ring(s) between the fixed and sliding gear, which
is a spacer that acts to brake the spinning of the sliding gear so that it
is the same speed as the fixed gear... allowing the dogs on the sliding gear
to enagage into the holes of the fixed gear smoothly. These rings are
incorrectly known as "synchos", "synchro cones", etc... and the correct term
is "baulk ring"... baulk meaning "brake and slow". These baulk rings are
made of softer material than the gears, and they wear in the "spacing"
dimension between the fixed and sliding gear... so that they no longer
provide suffiicient baulking action, the gears speeds are not matched, and
there is "snap" action as the dogs engage which you feel on the stick.
A dog box does away with these rings entirely, and the sliding gear is
simply "slammed" into the fixed gear, at whatever speed the driver is able
to achieve in the matching of road speed to engine speed via clutch / gear
shift action eg. hence the term "double-declutch". Unrefined, noisy, and
stressful... but they are positive engaging, and built for strength, motor
sport applications, etc.
To add to the lesson and another 100 words....
Each of these sliding and fixed gears represent a different gear selection,
and have a corresponding gear on an opposing shaft that they mesh with to
achieve output drive. "Refined" vehicles mesh these gears with angular cut
teeth, which produces a quiet transmission drive... "performance" vehicles
use straight cut teeth as they are stronger, but they are noisy. eg. the
Muncie M22 "Rock Crusher" box that was popular on the "better" muscle cars
of the 60s
How did I do?
John Gillon
----- Original Message -----
From: <
m2j97@excite.com>
To: <
BC-BFLegacyWorks@egroups.com>
Sent: Thursday, November 23, 2000 7:30 AM
Subject: [BC-BFLegacyWorks] dog vs. synchro
> Can anyone explain the differences between dog and synchromesh
> engagement?
>
> What are the advantages and disadvantages of each?
>
>
>
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