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Honda DN-01
Posted on 10/04/2007 3:20:49 PM PDT by martin_fierro
Honda Introduces New Infinitely Variable Transmission for Motorcycles
4 October 2007
Hft
The Human-Friendly Transmission.
Honda Motor Co. has developed the Human-Friendly Transmission (HFT), a new automatic transmission system for motorcycles using Honda’s own infinitely variable hydraulic mechanical transmission (IVT). The HFT will be installed on the DN-01, a new motorcycle that is scheduled for market launch at the 40th Tokyo Motor Show.
The HFT is a compact and efficient IVT 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. Hft2 Configuration of the HFT. Click to enlarge.
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.
The HFT offers a selection from two fully automatic shifting modes: D mode for ordinary riding and S mode for a sporty riding experience; or a 6-speed manual mode, which gives riders the option of riding with a manual transmission feel.
The HFT also features the world’s first lockup mechanism for an infinitely variable hydraulic mechanical transmission, according to Honda. When cruising, this lockup mechanism works to minimize transmission efficiency losses, contributing to improved fuel economy.
In 1980, Honda introduced the Tact, a machine equipped with a Honda continuously variable transmission, the V-Matic. Honda has continued to develop a variety of new mechanisms up into the present.
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Honda DN-01
so did they drop an ATV tranny in a bike?
I remember reading about an infinite variable tranny in Popular Science back in the 70’s.
It was a belt device, where one side of the pulley got bigger and the other got smaller. It is in production today. This device is probably the same in theory, just computer controlled.
Yeah, I remember it used pulley’s but had no idea it was being used today. In what? Thanks for the info.
If I read this right, there is no “shaft”, no belt, no pulley, between the engines and the drive wheel. It’s just oil under pressure. Hydraulics. A hydraulic line. Simple modern hydraulic pump driven off the gas engine shaft, located at the engine. Hydraulic lines (to and from) to the wheel axle and a hydraulic motor on the axle.
So, what is this? A better looking scooter?
Honda....Slowly taking the Motorcyclist out of Motorcycling.
It will be great when I hit 90 years old.
Gas engine golf carts use the Milner Transmission. Extremely simple design and works!
I'll give 'em compact...but efficient? The article mentions a lock up for cruising, but pumping fluid always takes a lot of power, so I'm wondering about acceleration.
ah yes! the concept that woldn’t die!
“return of the hondamatic”!
yeesh
Donorcycle
About time. Suburu intro’d this in a econo car back in the 1980’s. It doesn’t need to be all that complicated.
The only thing missing is the constant rev up and shift, rev up and shift. It feels wierd at first to only have one rev up and not has to shift at 15 mph, 30 mph, 45, and 60.
A shiftless MC.
Is that anything like a shiftless MF.
I plead the 5th.
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