Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1921-02-20
STUDY TAKEN IN FORD
FORWARD DRIVE GEARS
Gurrrlich Gives Lecture No. 2:s2 nI,
Transmission Of the Uni
vcrSaI Car.
SHOWS HOW CAR REvERSEs
Interesting Facts Are Presented in
the Principle of the Planetary
System, Showing How Auto
Moves Forward and Backwards.
LECTURE No. 23..
The IHnrI I'rnnsn,IssIn


In Stuhyint: tn" fOrward-,rivc gears
ni The planetary transmission, We SAW
mat as the diameter and number of
the teeth in III" gears nDpru,,hcd ON.
another that the speed ratio Increased
nhiil itnhlly. when All the gears ar.
81 ~" same size. the ratio would b..
inlhitcly to one. or. IN other words,
IN" driven gear would not he moved
~ all II tn" size OF the driven gear
be how made smaller than it's drivin,
Ernr t'y"n VIII remember ii was
1hrg"r for tn" forward drivrj. tnru
IN" driven gear VIII be driven back
warl. or reverse. Lake. for the for
ward drive. tn" NOR" nearly III" gears
or" of The same diamtcr. The greater
WIN u" III" speed ratio and the creator
IN" leverage.
I,"i us soc how tho driven gear
- driv" uhhCltward Figure shows
IN" ARRANGEMENT OF the gears for re
v"rSinG let us aSsuin" that IA" gear
NJ mas seventy iiv" teeth. while tn"
Then q" III" nywh"cI and. therefore.
pm 6 r"volV"s. in the direction OF tho
arrow !. the gear Will roll on the
gear VI. revolving on the hin g in tn"
.if"",i"n of IN" arrow .. in dOiuE go.
Sow rs - has but twenty-five teeth.
~ VIII hay" made one rcvulu, Ion
when its Twenty-Five teeth have rolled
teeth OF VI. and SO when tn" NV ho-I
ana pin e hay" mad" :; complete rev
union - IN order To have com" in
contact with tn" s'vrntN-iiy" teeth of
~, VIII have had "a make ON. rcvo-
luton. plus ht'y teeth. or ,hr"" rev o.
iH'iDns VIII again. Therefore. bc
IN ih" position shown ia Fig. J.
Now, Is the gear f. is attached to
~" gear -. when gear - has made
mr." - resolutions. T. viii AIS"
nav" hhI Ia make thiS number %: rev
.lnt"nS. N"r" tn. gear j. and the
.fik'm gear l., tha, is. tn" gear at
ttcH'd 20 IN" propeller shaft. OF The
hhin" diameter ANA number az teeth.
th"n N" gear /: viii have had Ia innv"
~ ~" direction "f ia" arrow >. or
.a"k Wnrd for r"y"iuti"ns; cine
mn h""huSc T. ~ rolling around T.
u VIII iuall" only = r.Voiutions). Thus
inr each revolution OF TIC gear l.. and.
wheel aud "ng!n" will hav" 10 make
revolutions. and the speed ratio viii
N"w the driven gear /. ANA it's drly-
ihS gear + must h." IA" Same. for bot n
IN" SLOW speed forward and the re
S"rs" drlI". For forward driv" "
hsSun" that tn" driven gear had 90
tooth and i's driving gear 80. How
VIII this affect the speed ratio Of The
rev"rs" as above? 1t viii Increase
~ tn" i0-tooth.d gears makes =
revolution it VIII com" in c"utac,
WITH -" teeth ~ IN" GD-touth"d gear
i"' T.. NUS ~" pin 9 and engine
VIII have |" make three haifs. times
'wu, "r three revolutions for "n" "f
ne driven gear giving q speed ratio
OF 80 !.
Ia rractic". tn. gear L, . ami IA"
sluv speed gear {; ar. hunt into one
piece. called - u.pi" gear For Ia,
SAKE ~ balance and To allow thinner
Gears To he used. thor" are three of
ia'-" rim" gears and three pins {
on h' ~ whc"! Tor them.
iiHNfug til" three iripl" gears mesh =
iuf WIN SlnIi" set "t center gears
W..,s j nc"cssary that tn. gears b.
tm.d. For this reason It prlck runeh
mark rs und' on them and when as
La.
50 placed that thoy come to the marks
On Tia" center gears Unless this b"
20 some planetary tranSmiS*ionS "a"
mari, Will be- found on Tn" center
gears. when ih!s is III" case. the
pun"h mariS "u tn. triple gears must
he placed 50 that lines drawn through
IN" marks and the center OF tn. gears
"!il meet IL the center Of tho n.y.
wheel.
Like IN" forward drive. the reverse
driv" Is obtained lay holding the re
N"TS. gear stationary, by means OF Il
drum and brake band, the band being
operated by u foot pedal.
The SLOW speed and reverse drum
ar" placed side 10y aide. Th" gears
are attached 10 the drums 10y means
81 tubular sleeves. the siOwspe.,l
gear and slc"v" passing through tn"
Sleeve OF tn" reverse gear This il
shown in figure :. Here III" Matched
portion * represents the low-spccd
gear and drum. and the hatchcd por-
lion l. the reverse gear and drum.
In the Ford transmission the
driven gear. instead OF being CON
ucctcd directly to the propeller shaft.
is attached 10 a third drum. this third
drum win its brake band being used
as the foot or service brake OF the
car. II is shown In black.
When the car is standing stu!
while the engine is running the
sIow-spccd drum will rcvulve back
ward and reverse drum forward
should these drums be even slightly
held. the car viii have a tender cy
10 NOV" For this reason IL is a com :
mon thing TO see Ford ears move
the instant the engine is started
even with the emergency brake set,
the driver rushing into the caf and
applying the foot brake. or havin.;
some one apply this brake. while he
franks. The cause of this is that
tile drums are not free. as they may
have dragging bands. while dirt or
SUmincd oil may be holding them In
some way.
All three OF the drum bands are
equipped with an adjusting device.
which Will he found on top. Figure
/" shows one OF these adjustments
should the band slip. which will Se
Indicated by racing engine. tight
"ninG the nu; i will stop the slip
ping. while if the band draEs. loos-
ching the nut will free IL.
q: have just overhauicd my Ford
engine: main bearings. connecting