Bandless automatic transmissions?

On Sat, 26 May 2007 07:46:03 -0400, KG > wrote:


>On Fri, 25 May 2007 21:36:54 GMT, wrote:

>>On Wed, 23 May 2007 11:49:19 +0000 (UTC), Tegger >
>>wrote:
>>
>>>I know Honda and Toyota have used bandless automatics for at least 20
>>>years, and Chrysler's A604 was also bandless.
>>>
>>>Any other bandless automatics out there?
>>
>>If you want to sit in front of the computer all day long to find out,
>>try this site...
>>
>>http://www.rockauto.com/catalog/catalog.php
>>
>Sorry for the off topic, but what is a Bandless automatic transmissions, and how do they differ
>from the normal band type transmission?

http://www.just****inggoogleit.com/s...s+transmission

KG wrote:

> On Fri, 25 May 2007 21:36:54 GMT, wrote:
>
>
>>On Wed, 23 May 2007 11:49:19 +0000 (UTC), Tegger >
>>wrote:
>>
>>
>>>I know Honda and Toyota have used bandless automatics for at least 20
>>>years, and Chrysler's A604 was also bandless.
>>>
>>>Any other bandless automatics out there?
>>
>>If you want to sit in front of the computer all day long to find out,
>>try this site...
>>
>>http://www.rockauto.com/catalog/catalog.php
>>
>
> Sorry for the off topic, but what is a Bandless automatic transmissions, and how do they differ
> from the normal band type transmission?
> *****************

They don't have bands ;-)

OK, I assume you want a little more info than that. In an automatic
transmission, gear ratios are changed by either holding or releasing
different parts of a planetary gearset. You can hold the sun gear and
drive the planet carrier and tap power off the ring gear (ratio
step-up), hold the ring gear, drive the sun gear and tap power off the
planet carrier (ratio step down), hold the planet carrier, drive the sun
gear, and tap power off the ring gear (reverse), and many other
combinations especially when two or more planetary sets are daisy-chained.

Bands are a convenient way to hold the ring gear locked, since the ring
gear forms the outside of the planetary gear package and the band can
just clamp down on it. The downside is that they're a little trickier to
modulate smoothly than clutch packs, so clutch packs are easier to
control via computer. Other than that, bands and clutch packs are pretty
much interchangeable. The downside to clutch packs, by the way, is that
they have more parasitic drag when released than bands usually do.

On Tue, 29 May 2007 17:29:58 -0500, Steve > wrote:

>KG wrote:
>
>> On Fri, 25 May 2007 21:36:54 GMT, wrote:
>>
>>
>>>On Wed, 23 May 2007 11:49:19 +0000 (UTC), Tegger >
>>>wrote:
>>>
>>>
>>>>I know Honda and Toyota have used bandless automatics for at least 20
>>>>years, and Chrysler's A604 was also bandless.
>>>>
>>>>Any other bandless automatics out there?
>>>
>>>If you want to sit in front of the computer all day long to find out,
>>>try this site...
>>>
>>>http://www.rockauto.com/catalog/catalog.php
>>>
>>
>> Sorry for the off topic, but what is a Bandless automatic transmissions, and how do they differ
>> from the normal band type transmission?
>> *****************
>
>They don't have bands ;-)
>
>OK, I assume you want a little more info than that. In an automatic
>transmission, gear ratios are changed by either holding or releasing
>different parts of a planetary gearset. You can hold the sun gear and
>drive the planet carrier and tap power off the ring gear (ratio
>step-up), hold the ring gear, drive the sun gear and tap power off the
>planet carrier (ratio step down), hold the planet carrier, drive the sun
>gear, and tap power off the ring gear (reverse), and many other
>combinations especially when two or more planetary sets are daisy-chained.
>
>Bands are a convenient way to hold the ring gear locked, since the ring
>gear forms the outside of the planetary gear package and the band can
>just clamp down on it. The downside is that they're a little trickier to
>modulate smoothly than clutch packs, so clutch packs are easier to
>control via computer. Other than that, bands and clutch packs are pretty
>much interchangeable. The downside to clutch packs, by the way, is that
>they have more parasitic drag when released than bands usually do.


THANK YOU for the informative response. That was just what I was looking for, a quick
knowledgeable summation.
*****************
Thank You

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What's the name of that Swedish company that makes motorcycles and small
engine tools,stuff like that? Huskvarner? (I could cheat and look it up)
They used to build some motorcycles that had bandless automatic
transmissions.DAF too.And there are Comet torque converters,automatic
bandless transmissions.A bunch of others too,I think.
cuhulin