There is an urgent need for a transmission that can limit the needs for new investments.
Transmission manufacturers will need a complex mix of powertrains that can accommodate old and new technologies such as ICE, EV, Hybrids, hydrogen fuel cells. California and New York will require less pollution and phase out ICE light vehicles. Moreover the manufacturing process may have to change every 2 or 3 models.
The “Differential CVT Transmission” is the perfect solution to new problems. No more automatic transmissions in cars and trucks.
The many advantages of the
Differential CVT Transmission
The CVT controls the output speed.
Flexibility
The Differential CVT Transmission can be adapted to many technologies such as ICE, EV, Hybrids.
It can also combine several sources of energy running at constant speeds.
Those speeds can be different as long as they are constant and can be linked by a mechanical connection
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This is an example of a gas engine with an electric motor.
Opening and closing three clutches allow for:
- Starting the gas engine (ICE)
- Remaining idle
- Driving
- Dynamic braking
- Reverse
No need to switch gears:
Stepping on the gas increases the gas intake. The power sent to the wheels increases but the motor's speed can remain constant.
The CVT's ratio can change to keep the motor's speed constant.
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No more need for automatic transmissions in cars and trucks.
Any speed range is possible:
By selecting the CVT's ratio and the gear ratio you can adapt the speed range to any application. (You would not want a car going full speed in reverse).
Moreover, the speed range can start from zero speed. This was not possible with a gearbox.
For some applications, the speed range can vary continuously from full speed forward to full speed backward.
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Much higher starting torque - Higher torque at any speed:
The new transmission can always cut the speed in half and double the torque. It transfers a power while the gearbox is only transferring a torque.
A truck can climb very steep hills fully loaded. A small bull dozer can move mountains (slowly).
The power available to the driver is always the maximum power that the engine can produce.
Dynamic braking
Power = Torque x Speed
The gearbox keeps a mechanical ratio between the speed of the vehicle and the speed of the motor. As the car slows down to a stop, the power sent back to the battery goes down to zero.
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With the new transmission, the speed of the motor is independent of the speed of the car. The power sent back to the battery is the maximum power that the motor can deliver.
Reduced pollution:
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We can keep the motor running - all the time - at the speed of our choice.
This speed can be the speed of minimum pollution
The CO2 and CO and NOx generated by a gas engine can be limited to the strict minimum.
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With a Differential CVT transmission, VW would not have to cheat to pass the pollution test.
Better use of electric motors:
Power = Torque x Speed
Electric cars have a mechanical ratio between the speed of the motor and the speed of the car.
When starting the vehicle, the electric motor operates at constant torque and its speed follows the speed of the car. When the speed of the car is down to zero, the power sent to the wheels is also down to zero when you need it most.
With the Differential CVT transmission the speed of the electric motor is independent of the speed of the car. The full power that the electric motor can deliver is available at any speed of the vehicle.
Tesla used 1200 HP to get to 60 MPH in 2 seconds.
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With a Differential CVT transmission they could have done it with less than 600 HP
Better gas mileage:
With a conventional transmission the speed of the motor keeps changing with the speed of the car. The motor operates very seldom at its speed of maximum efficiency.
With a Differential CVT transmission the motor can be kept running - all the time - at its speed of maximum efficiency and save gas.
Cheaper to build:
The new transmission has very few parts compared with a conventional transmission. It is cheaper to build.
CVT and differential have been used in the car industry for many years.
Many applications
The Differential CVT transmission replaces the gearbox and gearboxes are everywhere.
The Differential CVT transmission can replace the old gearbox in any industry such as: Cars - buses - bulldozers - agricultural machinery - trucks - speed variator - pumping stations - material handling... Even windmills and locomotives
Patents US 8,771,127 B2 - US 9,109,681 B2 - US 11,028,913 B2
Differential CVT