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Automated Manual Transmissions (AMT) suffered from poor shift quality until Zeroshift Limited developed its new replacement for synchromesh. The Zeroshift system provides smoother shifts, improved acceleration and reduced emissions.
Existing manual gearbox plants are easily converted to Zeroshift. The basic manual gearbox architecture and the
single clutch are both retained. The Zeroshift mechanism is compact enough to replace a synchromesh pack even in small
cars and motorcycles.
Acceleration, effi ciency, size and weight of Zeroshift all compare favourably to the best automatic transmission systems while shift quality is either matched or exceeded. The technology is applicable to all passenger cars, trucks, motorcycles, motorsport vehicles and off highway equipment.
Zeroshift technology is a seamless, instantaneous means of changing gear ratios without interrupting the torque to the driveline. It is less expensive than both continuously variable transmissions (CVT) and dual clutch transmissions (DCT)
Two drive rings with alternating faces share a common
hub and allow drive in one or the other direction; one ring
takes up drive, the other eliminates the backlash that is
common in dog shift transmissions.
When conducting a Zeroshift, the unloaded ring is
moved with considerably less force to that of existing
transmissions. Engine synchronization is conditioned by
a control system to ensure a seamless torque transition.
Velocity
Acceleration
1st gear
disengaged
2nd gear
engaged Time
Manual Automatic
Time
Note: Velocity
curve through shift
Dual Clutch
Time
Note: Reduction in
velocity gradient
during shift
Automated Manual
Time
Note: ‘G’ drop prior
and during shift
Zeroshift
Time
From 1st gear
into 2nd gear
Velocity
Acceleration
Note: No sudden change in ‘G’ no loss,
in velocity – an instant smooth shift
The Zeroshift mechanism fi ts in existing package envelope and unlike alternative systems, the Zeroshift mechanism can be assembled in existing factories.
Our team of expert engineers will help convert existing driveline systems and bespoke designs from prototype to production and be there at every step to assist.
System overview
Zeroshift
Clutch ECU
TCU
CAN bus
Better performance
Because of its enhanced performance, Zeroshift allows
vehicle manufacturers to downsize their powertrains, allowing, for example, a 1.2-litre engine to enjoy the same performance as a 1.4-litre engine.
This is achieved due to the complete removal of shift time normally associated with a synchromesh manual.
In a drag race, a 2005 Mustang fi tted with Zeroshift gained over 5 car lengths over an otherwise identical manual car.
Time
V e l o c i t y
MANUAL
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