CVT

Honda has outlined its next-generation technology for automobiles at the Tokyo Motor Show. "Earth Dreams Technology" is a broad revamp of engine and transmission technologies with which the company aims to achieve ambitious, industry-leading fuel efficiencies for every category within three years, while simultaneously setting a timeline of 2020 to reduce by 30% CO2 emissions for all products sold worldwide, relative to emission figures for 2000. Read More

While the European motorcycle industry is in crisis due to dramatically falling sales, BMW is moving in the opposite direction thanks to its loftier perspective of the mobility (as opposed to motorcycle) industry. After years concentrating on larger capacity two wheelers, it is moving into the scooter field. Having already shown an electric version of its ultra-safe C1 scooter, plus several MINI scooter concepts in recent weeks, BMW Motorrad yesterday unveiled a maxi scooter concept. Two premium scooters will be derived from the concept vehicle in the near future and there’s also an electric version being investigated. Read More

Ready for a bit of a mental mechanical challenge? Try your hand at understanding how the D-Drive works. Steve Durnin's ingenious new gearbox design is infinitely variable - that is, with your motor running at a constant speed, the D-Drive transmission can smoothly transition from top gear all the way through neutral and into reverse. It doesn't need a clutch, it doesn't use any friction drive components, and the power is always transmitted through strong, reliable gear teeth. In fact, it's a potential revolution in transmission technology - it could be pretty much the holy grail of gearboxes... If only it wasn't so diabolically hard to explain. We flew to Australia's Gold Coast to take a close look at the D-Drive - and it looks to us like Durnin has pulled a rabbit out of his hat. Check out the video after the jump and see if you can work out if there's a catch. Read More

It seems that the lessons learned in developing a mechanical KERS system for F1 may yet hold the key to a low-cost, high-efficiency hybrid system particularly suited for the stop-start patterns of buses, which are quite similar to the distances between capturing and delivering energy of those of a race car. Torotrak will deliver a paper at the SAE Commercial Vehicle Congress in Illinois next week showing how flywheel KERS for buses can offer more than 30 percent fuel saving over the London bus test cycle, yet package around an existing transmission. Read More

Most of the efforts to produce more environmentally-friendly cars in recent years have focused on alternative fuels and more efficient engines. UK-based engineering company, Torotrak, has instead decided to turn its expertise to another vehicle component with the development of a new generation transmission that it claims can not only slash CO2 emissions and improve fuel efficiency, but also boost performance. Read More

Nissan and its transmission supplier Jatco have developed a next generation CVT (continuously variable transmission) that promises better fuel economy and performance in a compact and lightweight package. The new CVT combines conventional CVT belt operation with an auxiliary gearbox and has a significantly increased gear ratio range – roughly 20 percent higher than other CVTs and among the world's highest for production vehicles according to Nissan. Read More

Kei cars are a uniquely Japanese phenomena which began as a tax and insurance stimulus for the Japanese car industry in the post WWII era. Kei regulations only restrict physical size, engine displacement and power, so manufacturers have used every square centimetre and stacked it with as many advanced technologies as possible. The top-selling Kei car is Suzuki's Wagon R which offers a DOHC VVT 660cc engine, CVT transmission, engine stop-start, EBD, ABS, plus a Viscodrive coupling that provides on-demand AWD capability without electronics. Prices start at under 10 million yen (USD 9100) and the fully optioned Wagon R still comes in at under USD15,000. Maybe we need a similar stimulus based around size and emissions. Read More

The Soul Hybrid concept will be one of four world premiers from Kia at the Paris Motor show next week. Powered by Kia’s Gamma 1.6-liter petrol engine combined with a 15 kW, 105 Nm AC synchronized electric motor and the company's CVT (continuously variable transmission), the concept promises fuel efficiency of 57.6 mpg and CO2 emissions of 117 g/km. Read More

Yamaha is developing a CVT (Constantly Variable Transmission) enduro machine according to recent patent applications. Conceived by Leonardo da Vinci 500 years ago, the CVT power delivery characteristics could well be a boon in slippery off-road conditions, particularly with some help from a computer. The CVT's biggest advantage is ensuring the motor is always running “in the power band” and as the infinitely variable gear ratios change, it should deliver one smooth rush of power from standstill to top speed. Read More