Jump to content
Nyphur

Crazy Trannies*

Recommended Posts

A thready celebrating the weird and wonderful transmissions of this world.

It used to be that 4 on the floor was the norm, then the advent of the 5 spd box changed things up, nowadays we've got DSG. What are some of the more out there transmissions we've seen over the years. I'll start:

NB: Much of this content stolen from Jalopnik.

 

Quote

What do you do when you have a 50cc race bike with a tiny power band? Exploit using more gears; 14 to be exact.

That's what Suzuki did with their championship winning RK67 from 1967, which squeezed 17.5 HP with a 17,300 RPM redline from just a 50cc water cooled twin.

usakkm2k6gw1egtedw9k.jpg.3e2c39fe3cab73531c28fb360af4d882.jpg

 

Quote

In 1968, Volkswagen released one of the most interesting manual/automatic hybrids ever made, the Autostick. It had an vacuum controlled clutch that would disengage automatically whenever you touched the gearstick. The clutch controlled a 3 speed auto with an additional low range to get you moving, and a torque converter which would allow you to crawl with the car in gear.

Porsche also had the Autostick in their 911 and called it the Sportomatic. As cool as it is, it's not quite so weird as its predecessor.

zfjyhjpe09qpbapldlm8.jpg.765ec8441b28b3b638a9680d7d1ec66d.jpg

 

Please share your favourites. 

Share this post


Link to post
Share on other sites

the Model 70 AC "Automatic transmission unit" :) 

can anyone else name a setup/car that has a Centrifugal clutch driven by the engine which drives a gearbox that drives a a CVT transmission that drives a Triplex chain, that finally drives a differential all in one big lump :) 

image.thumb.png.94ae0db5dd1a60629b76276fa6af193f.png

Share this post


Link to post
Share on other sites
18 minutes ago, Timewaster said:

f412d2c55e.jpg.45fc8b7ab89e356599aee48af94b38be.jpg70s Mitsubishi madness.

I remember that gearbox a mate had a turbo hatchback thing and it felt weird being driven in it as compared to my mums 1.3 escort it felt like a rocket ship.

Share this post


Link to post
Share on other sites
49 minutes ago, Nyphur said:

A thready celebrating the weird and wonderful transmissions of this world.

It used to be that 4 on the floor was the norm, then the advent of the 5 spd box changed things up, nowadays we've got DSG. What are some of the more out there transmissions we've seen over the years. I'll start:

NB: Much of this content stolen from Jalopnik.

 

usakkm2k6gw1egtedw9k.jpg.3e2c39fe3cab73531c28fb360af4d882.jpg

 

zfjyhjpe09qpbapldlm8.jpg.765ec8441b28b3b638a9680d7d1ec66d.jpg

 

Please share your favourites. 

Fichtel & Sachs "Saxomat", a version of which was used on the Ro80.

Also the BVH4 that the original DS had.

The "semi-automatic" description is a bit misleading. They are more properly "clutchless manuals" in the sense that whilst there are just the two pedals,  you still have to change gear yourself. 

Share this post


Link to post
Share on other sites

For my money, some of the most mental tranny's that I've come across (behave) have been the SMG in BMW's of the last 10 years or so.

Fully auto most of the time, but if you want something a bit more involved then you can easily switch to a semi

 

semi-automatic-gearbox.jpg.fe22a5615b610f3e38c6e67ac8e87640.jpg 

Share this post


Link to post
Share on other sites

I love that design common on things like tractors, presumably Unimogs and my dad's old Austin Champ that gave you the option of all ratios in reverse. Apparently the Rolls Royce B40 engined Champ could do 85mph in reverse.

Share this post


Link to post
Share on other sites
35 minutes ago, warch said:

I love that design common on things like tractors, presumably Unimogs and my dad's old Austin Champ that gave you the option of all ratios in reverse. Apparently the Rolls Royce B40 engined Champ could do 85mph in reverse.

Pfft my car can do that too :mrgreen:

(the amusing thing is aparently the villiers machines had an inhibitor (that can be bypassed if your mad enough!) of sorts to stop you selecting above 1st gear while in reverse, but the much faster Model 70 AFAIK has no speed limiter of any kind when in reverse)

Share this post


Link to post
Share on other sites

Honda's Human Friendly Transmission (HFT) as seen on my DN-01:

 

Quote

A transmission system with a wide range of functions in a single unit, the HFT is a compact and highly efficient infinitely variable transmission system encompassing functions for starting, power transmission and shifting, all on a single shaft. The basic configuration of the system consists of an oil pump for converting engine power into hydraulic pressure, and an oil motor for converting the hydraulic pressure back into power for output. Both are made up of multiple pistons, a distributor valve and a swash plate for piston operation, while the cylinders are integrated into the output shaft, forming the characteristic structure of the HFT.

 

 

hondadn01hft.jpg

 

hondadn01hft2.jpg

 

hondadn01hft3.jpg

 

Don't ask me - I haven't a fucking clue. All I know is it's coupled with a shaft drive for zero maintenance and allows me to press a button labelled D (Or S if I'm late) and I'm away.

 

Share this post


Link to post
Share on other sites
1 hour ago, somewhatfoolish said:

Scammell?

Yup, the infamous constant mesh "Gatechange" gearbox designed by Oliver North in the early 1930s and used by Scammell well into the 1960s. Apparently for the true masochist the guide plate is removable. 

The VW set up very much reminds me of Standard Triumph's "Standrive" two pedal semi automatic. Standrive.thumb.jpg.d09190bf63dfaceeaf6a6b150aa3ec05.jpg

This used a vacuum operated centrifugal clutch system activated by a button on the gear lever, developed by Newton and Bennett as "Newtondrive" and sold to both Ford, who used it on the 100E and Standard Triumph who offered it on the 10 and their 6cwt van. God only knows how well it actually worked in practice but in February 1957 Commercial Motor tested the van version and seemed quite impressed. http://archive.commercialmotor.com/article/22nd-february-1957/36/standard-halv

Share this post


Link to post
Share on other sites

While searching for more examples of push-button transmissions, I found the 2018 Honda Odyssey.

lets-get-into-some-nuts-and-bolts-honda-

WAT.

 

 

Also, I've heard about the Scammel constant mesh before, but what exactly does constant mesh mean?

Share this post


Link to post
Share on other sites

In practice it normally seems to mean there's no synchromesh, which means you have to rev match when changing gear in order to avoid nasty crunching noises.  As far as my limited knowledge of gearbags goes, synchromesh gearboxes are also effectively constant mesh, in that the gears on the input and output shafts are constantly meshed with each other, but the synchro mechanism spins the relevant cog up to the required speed before the gear is engaged, thus avoiding the need for rev matching and / or double declutching.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...