Tulsa daily world. [volume] (Tulsa, Indian Territory [Okla.]) 1905-1919, 1918-05-26

,he engine l have to have a
greater bore, for the latter case, than
for the former.
Now. for more than 30 per cent
Of the time the car will travel on the
Jewel ora practical level road, and
we're the engine of a bore sufficient
Tor hill climbing, great excess
weight would have to be carried for
20 per cent of the time. Naturally.
therefore. the designer will look for
tome way to do away with the need
Tor carrying the excess weight.
To an engineer the solution will
come instantly, 1t being the furnish
ing of the driver with a system of
levers by which he can connect the
engine to the rear wheels when he
comes to hill. A system, os as it
Is technically termed. a train of
gears, is such a system of levers.
In previous article showed how
the gears acted as a system of levers
and as some OF my readers may have
lost or not seen this article, I am
going to repeat this.
You have no doubt seen a safe or
pther heavy article moved or lifted
by a means of crowbar, as is shown
In Fig. /. Now II the distance B
lNi tAiiiCS ho 81 cat dS Nilc
tance c. then a man pressing 100
pounds at D 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 dis
lance B and c.
Now supposing we were to make
the Bar b a gear wheel B and fasten
to- this shaft, as shown in Fig. 2.
Then We would have the same con
hitiop as in Fig 1, only we would
have wheels instead of bar. II the
diameter of 3 be ten times that OF
c. 100 pounds at d would lift 1000
pounds at p by connecting the gear
r to the engine. the engine would be
given a leverage of ten TO one over
the pressure at T..
Now having the gear wheel r ten
times the diameter of would be
large and umbersome ARRANGEMENT
This disadvantage can be overcome
BY using two sets of gears. Thus in
Fig. we have the shaft II as the
driven shaft. which would he CON
nected to the rear wheels, while !
Is a gear connected to the engine,
BY adding the gears J, r and + we
ran still get a leverage of ten to one
have diameter three times that of
the shaft H. so that II the load on
II be / 900 pounds the pressure on
the teeth at X would be 333 pounds.
BY having the gear r three and
third times the diameter OF f. the
pressure at d would be but 100
pounds.
To further simplify the construc-
ton the gears p and are placed In
back OF one another, as shown in
Fig. 4, rather than as shown in Fig
3. You will observe that the gears
p and L always revolve at the same
speed, so they can be fastened t.
the same shaft. The gears = and ]
will revolve at different speeds how
ever and so they cannot be CON
nected to the same. shaft. The usual
way OF assembling these two gears
to have = hollow and 70 let the
ind OF the shaft Of the gear rest
and revolve inside of the hollow
Eear' which thus acts as a bearing
'his is shown in Fig. 4.
., by referring to Fig. . you will see
mat the small gear F will revolve
nany times for one revolution 6f the
large gear
IN q later lesson I will show fOu
now the shifting of the gears is ac-
tomplished and will tell you Of some
Pt the troubles the transmission is
peir 70. What I want to call your
nttention to today is the reasons for
He transmission as given above.
me maker went to considerable
expense In furnishing the transmits.
pon and II you fail to use 1t when