Cone Ring Transmission KRG

Cone Ring Transmission in front and cross design with automated dry clutch

General

Automatic transmissions with high performance and low production costs for low and middle class cars are hardly available on the current transmission market. With the KRG GIF has a promising transmission under development that offers the driver a multifunctional powertrain with various driving programmes

• Continuously variable ratio change (CVT-Mode)
• 6- or 7-Gear Automatic
• Simulated manual shifting service (Step-Mode).

The cone ring principle is not only unique to front wheel drive configurations, but also offers promising options for rear wheel drive arrangements and for high torques.

Benchmark investigations regarding manufacturing costs show clear advantages for the KRG since basic functions are realized by simple mechanical solutions. Low tolerance requirements on transfer parts generate even more advantages for the system and price comparison.

Variator consisting of input-cone, ring and output-cone

Technical Description

The continuously ratio change is performed by two cones and one ring. These transfer parts are separated via an oil film from each other. Therefore the traction characteristic of this oil has a great importance. To improve the oil optimally with regard to power transfer, the oil storages for the bearings and the continuously variable friction power transfer are separated from each other.

As a start element all common systems in the automotive industry are possible in principle. As the KRG needs no hydraulic-oil pump due to its mechanical pressure unit an automated dry clutch with its high efficiency is best qualified.

Sectional view of the KRG with adjusting and pressure unit

The quick ratio change to the required ratio position is effected via little steering motions on the transfer ring by the adjusting unit (1). This basic principle allows to the - similar to the steering motion of a bike -high adjustment dynamics with low adjustment power.

Due to immersion lubrication of variator and toothing and a simple mechanical pressure unit (2) for generating, the clamping force the KRG needs no hydraulics. Therefore, a high efficiency and a low weight are achieved.

Technical Data of an executed transmission