JATCO Develops New CVT for Small Cars
JATCO Ltd has designed a new CVT solution for small cars, named as the CVT-S (JF021E). The newly designed solution is a compact, light-weight, and fuel-saving product with optimized ratio span that is suitable for small cars, which occupy a significant market share (approx. 40%) in Japan.
Picture from the CVT-S presentation
Its main peculiarities are as follows:
Optimized ratio span for small cars
Ratio span has been refined at 6.0, considering
Japan’s traffic peculiarities and aspects of the small car use. This enables the
CVT-S to ensure both fuel efficiency and operating capacities suitable for
small cars.
Lower friction
The CVT-S is notable for a cascading piston
design, for the pulley pressure cavity, and low-friction ball bearings.
Moreover, there is a baffle plate available for the gears. Fluid spreading,
pulley hold pressure, and final drive ratio have all been refined. Therefore,
friction is decreased by 8% in contrast to the CVT7 solution.
More compact and lightweight
All steps on weight saving were elaborated in
detail for each element, resulting in a cut-down of the internal diameter of
the pulleys and a refining of both the sheave walls and the walls of the
pressure chamber elements. All these steps helped to decrease the weight by
approx. 6% (about 4.2 kg) in contrast to the CVT7 transmission.
Jatco CVT7
Optimized performance
A double-pinion 4-planetary-gear design was
implemented to lower grating
of gears when engaging the R gear. Moreover, the stiffness of coupling with
the engine was enhanced by improving the coupling configuration and coupling
points between the engine and transmission.
JATCO’s overall volume of CVT production progressed to the level of forty million units since the start of production more than two decades ago. The company has a strong belief in its advanced developments and professionalism of its employees, which will be certainly reflected in the new CVT-S.
