Author Topic: Honda gearbox research  (Read 2903 times)

VicW

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Honda gearbox research
« on: August 24, 2016, 07:07:27 PM »
A possible Honda gearbox for the future although they are not the only ones doing similar research.
With eleven gears it is almost stepless like a CVT.

http://www.autoexpress.co.uk/honda/96778/gearbox-wars-honda-patents-11-speed-triple-clutch-unit?_mout=1&utm_campaign=autoexpress_newsletter&utm_medium=email&utm_source=newsletter

Vic.

guest6230

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Re: Honda gearbox research
« Reply #1 on: September 05, 2016, 04:38:35 PM »
The future is electric and hydrogen cell so gearboxes will be a thing of the past thankfully.

guest5589

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Re: Honda gearbox research
« Reply #2 on: September 05, 2016, 04:53:26 PM »
How about a Hybrid ICE car but with a direct drive?
https://www.carthrottle.com/post/engineering-explained-how-the-koenigsegg-regera-hypercar-drives-without-a-gearbox/

"The process of reaching the top speed:

1. The two electric motors on the rear axle start acceleration, pulling their energy from the car’s battery. The hydraulic coupling is open at this stage, so the engine can charge the battery if necessary, but does not provide any power to the rear wheels. Why not? At this point, the vehicle is traction limited, so putting down more power is not an option. The Regera reaches 62mph in 2.7 seconds, which is pretty impressive considering it’s RWD only.

2. As the speed of the vehicle increases (from 0mph) the hydraulic coupling begins to close up. This means not only is the engine providing torque to the rear wheels at this time, but the crank-mounted electric motor is as well.

3. At around 30mph, the hydraulic coupling can lock up, so now the engine is directly driving the rear wheels without the interference of a transmission. 30mph correlates with about 1000rpm. Where does 1000rpm come from? Here’s some maths:

(30mph)/(((((345mmx0.30/(25.4 mm/in))x2+(20 in))x(pi))/((12 in/ft)x(5280 ft/mi)))x(60 min/h))x(2.85) = 1021 RPM (crank speed at 30 mph).

Essentially, you’re trying to calculate the number of times the tyre rotates (345/30R20 size) at 30mph, and then this number is multiplied by 2.85 (the final drive ratio) to determine the engine speed.

4. Once the hydraulic coupling is closed up, the car will reach its top speed once it reaches the engine’s redline at 8250rpm. It’s really that simple!"

culzean

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Re: Honda gearbox research
« Reply #3 on: September 05, 2016, 06:30:51 PM »
The future is electric and hydrogen cell so gearboxes will be a thing of the past thankfully.

Until someone finds a cheap and energy efficient way to make Hydrogen,  make it easy to store and transport - fuel cells also need to be kept within certain temperature range to work,  heat has to be added to cell on startup to get it going. A fuel cell cannot accept regenerated electricity or be charged,  so batteries / super capacitors will still be required to make whole system as efficient as possible.

We are stuck with rechargeable batteries and or / petrol electric hybrids for a while yet.

http://www.afdc.energy.gov/fuels/hydrogen_production.html

http://www.mpoweruk.com/hydrogen_fuel.htm

« Last Edit: September 05, 2016, 06:43:19 PM by culzean »
Some people will only consider you an expert if they agree with your point of view or advice,  when you give them advice they don't like they consider you an idiot

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