AD&P; > April 2014 > NOTABLE
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his foot from the brake and the engine is still coating
down, you can't push the starter gear into the ring gear."
So they've developed a system that is integrated into
the housing of the torque converter that is based on a
wrapped spring around the torque converter that acts
as a one-way clutch. The starter pinion
is always engaged with the ring gear.
When the starter is activated, the
clutch engages the torque converter
so that the engine restarts.
Once the engine is started,
then the clutch is released.
Hemphill points out that
this is sufciently compact
for use in small front-drive
vehicles. In the city driving
cycle it provides about a 6%
fuel economy improvement;
adding in the highway cycle,
the savings are on the order of
3 to 5%.
And speaking of connecting
and disconnecting via a
clutch, they've developed
an all-wheel-drive (AWD)
disconnect clutch that
consists of a hydraulically
operated synchronizer
clutch that's integrated
on the input shaft on the
power take-of unit (PTU)
and electrically operated
dog clutches on the rear
axle. Hemphill says that this
system allows reconnection
to the AWD under more
driving conditions than
other systems on the market;
fuel save is on the order of
5% combined and 8% on the
highway cycle.
"We have a variety of hybrid and electric drive
solutions," Hemphill points out, lest it seem as though
Schaefer is only about modifying existing systems.
Given the continued deployment of existing powertrains,
the development that they're making in terms of
bearings, valves and clutches certainly can make a
diference to both OEMs and their customers.—GSV
p Permanently
engaged starter
generator with torque
converter: makes starts
seamless when quickly
going from a decel to
accel situation.
p All-wheel-drive
disconnect clutch:
When the AWD system
needs to be reengaged
quickly, this system
makes it happen stat.
0414ADP Notable.indd 12 3/18/2014 12:18:43 PM