Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1918-06-30
|sIMPL|F|ED LESSONS IN
CARE OF AUTOMOBILE
tPIanetary Transmission Explained in
Plain Language by Motor
Car Expert.
HOW GEARS DO THEIR WORK
Car Owners Have Their Troubles
Remctlied and Doubts Dissolved
q by communicating Direct With
s. "the Man Who Knows"
AuTo LESSON no. 81.

Copyright. iolS. by Fred. Z Gucrrichp
Because of the great number OF Ford
cars In services work of this kind
3 would be incomplete II its transmission
s (Which is radically different from
x others) were not explained. This trans
Z mission is known as "a Planetary
Y. Type. because the gears are always
skcpt-in one plane none being shifted.
gsas is the case with other types.
OF course the purpose ~ inis trans
mission is the same as others: namely.
TO give the engine a leverage for hill
climbing and starting, and 10 permit
the engine to revolvc faster than tho
rear wheels when the car must move
slowly because OF The traffic. etc.
Let us sec how the planetary trans
mission gears accomplish their purpose.
You have often seen a safe or other
heavy object moved by means Of a
row-bar as shown in Fig. l. Here
there is an obstruction y on the ground
against which the end Of tho crow-bar
rests. Thus a pressure OF 100 pounds
M & would cause a pressure five times
This or 500 pounds 10 be excrted at Is
Now were II impossible TO get the lower
end of the bar under the safe. il could
lie moved in the same way as above by
having tho bar on the side or the safe
and having an offset as Y. in Fig =
on II, Fig. being = view OF Fig
looking from the right
IL only one bar were used the safe
would be moved a little and then a
new grin taken with the bar. but ii
: 2 number OF bars were used one tax.
, ing hold after the others the movement
OF the safe would he continuous Now
2 gear is really a number OF crov-bars
built together. This idea is shown in
fle. 8 where the teeth !. >. 3. and /
are shown as bars
We can now look AT Fig Here
the gear is stationary and nigh, be
regarded a : the ground OF Fig / The
one-piece gears r and q; nigh, 10 re-
sarued as the crow-bar Q. Fig . with
US onset. while the gear L. which can
n nc mace 20 sevoive. and which is CON
hected 10 the rear wheels might he
Regarded as the safe 10 be moved Tho
pm T. connected 10 the avwhee, ana
SO engine driven. can be regarded a.
the end c OF the bar Fig. arains,
"hlch the pressure is expected
Ihus the onc-picce gears = and :.
are really revolving crow-bars which
USING Inc stationary gear n as a f,,.
crom. prH the gear I. around ava on
give the engine leverage for rnvo,v.
ing the shaft which drives tho ras
wheels 'he rear
II the obstruction a of Fig. !. could
nave and were its resistance 10 move.
ment less than the resistance ~ 49,
safe' the obstruction would ho ro,.ns
A"aru pE the crow-har instead -.
.ne sate being moved forward Tbo
same rs true OF the gear ID OF Eir
as were It's resistance to REVOLVING !, :.
TN maj OF T. IL would reyolve ~.
~aIu ana T. would be Stationary IL
. neM Is way 10 free the engine 49,.
tN'hs the rear wheels. or for
!, urNe them, nj tho will OF ~
- st.,;a nancy by holding the goa,
70 as.'onarF or freeing IT,
rms is accomplished bv ,,,
rra,. 10 drum similar 10 ,ho
it,, rum on the rear wheels and
hn q brake band around the drr,n
,; OF which II can he held s,s
.onarE' or can be freed In F;c,rn
\ is the drum and l. tho hr.,s u'e
Inc hahd l. is frightened bv prossinn
on foot pedal pressing
fiEure is view OF the gears ,oo,,
ing from the right at Firure ' ION
shown only one Sc, Of mo ny
gears r and G on the nywbael -
practice there are three ~
i'iaced equal distances anar, IT,.
is done 10 have a better balance 's
to permit narrower gears heinz usa.,
DIS by having three gears the strength
and therefore length. OF the teeth need
DE but third of what they wouId
nave 10 be were only one gear used
Having seen how the gears. give thc
necessary leverage. .let-us. REPEAT Just
what happens.
when the band I. is free and engine
running. the resistance OF u will be
less than r. and so the gears r. and G
VIII rtvolve or roll around f., driving
D backward ~ /. does not move the
car Will not move. When l. is tight
ened the drum viii be held and So IN,