Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1918-06-02
S|MPL|F|ED LESSONS IN
CARE OF AUTOMOBILE
Guerlich Describes Transmission
Troubles and Their Cure in
Simple Language.
REAL PURPOSE is EXPLAINED
Driver Makes Mistake When He
Fails to Use Device Furnished by
Engine Maker to Increase Ell.
cheney Of Machine.
Copyright. 1918, by Frederick G..
Gucrrlich)
Auto Lesson No. DO.

auto Lesson No. DO.
Before we can properly understanI
the troubles OF the transmission. their
cause and remedy. we must see what
the purpose OF it is. Its action and it's
design Let US. therefore. look into
the latter.
Inc purpose of the transmission is
three-fold: nrst. 1t can give the engin.
leverage for hill climbing: secondly.
10 permit the engine to revolve faster
than the rear wheels when the car mus,
travel very slowly. thus preventing the
stailins OF the engine. and. thirdly. il
provides a means for driving back
wards.
When the designer has TO decide upon
the size OF the engine, bore. he must
consider what the engine must accom- :
pltsh Upon investigating he will find
that when the is travelling on the
level road that the engine will have to
overcome the friction of the car and
the resistance OF the wind. but that
when climbing hill it will I'm addi-
ton TO the above. also have to lift
the car from the foot OF tho hill to
the top of the hill. Thus the engine viii
nave to have n greater bore.s for the
latter case. than for the former.
Now. for more than 80 per cent Of
the time the car will travel on the
level or a practical level road and
were the engine OF bore sufficient
for hill climbing. a great excess
weight would have TO be carried for
80 per cent OF the time. Naturally,
therefore. the designer will look for
some way TO do away with the need
for carrying the excess weight.
To an engineer the solution will
come Instantly. IT being the furnish
ing of the driver with system OF
levers by which he can counec, the
engine to the rear wheels when he
comes TO hill system, or as IL
is technically termed. train of gears,
Is such a system OF levers.
In previous article l showed how
the gears acted as a system OF levers,
and as some Of my readers may have
lost or not seen this article. am going
20 repeat this
You have no doubt seen a safe or
other heavy article moved or lifted
by means OF crowbar. as is shown
in figure !. Now il the distance b
were ten times as great as the dis
lance c. then man pressing 10,
pounds at ID would be able TO lift a
weight OF ten times this, or 1000
pounds at c. the weight lifted and the
pressure used being as the distance 3
and g.
Now supposng were 10 make
the bar gear wheel 3 and fasten
TO this shaft. shown in figure >.
Then We would have the same con-
dition as in figure l. only we would
have wheels instead OF bar. II the
diameter of Is be ten times that OF
c 100 pounds at u would lift 1000
pounds at f. BY connecting the gear
+ TO the engine the engine would be
given leverage OF ten to one over
the pressure at f.
Now having the gear wheel ten
times the diameter of = would be a
large and cumbersome arrangement.
This advantage can be overcome by
using two sets OF gears. Thus In
figure we have the shaft as the
driven shaft, which would be con-
nccted TO the rear wheels while p
is a gear connected to the engine
BY adding the gears j. 3 and we
can still get leverage OF ten TO one.
In this case we could make gear j