Cone Ring Transmission KRG
Cone Ring Transmission in front and cross design with automated dry clutch
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
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
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
|Max. input torque ||180 Nm|
|Max. input speed ||6.800 U/min|
|Weight (oil filled) ||65 kg|
|Starting ratio ||14,32|
|Center distance ||187 mm|
|Start of device ||dry clutch|
|Ratio adjustment ||electro-mechanical|