Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1917-08-11
80 5 &IEST NEWS OF THE iME{l I{02M1oBlLE IRADEa
ELECTRICAL SPECIALISTS CONTINUE DISCUSSION ON THE
CONNECTIONS BETWEEN AUTOMOBILES MOTOR AND ENGINl
tBy Special Permission from Motor

Ing screw threads on the inside, 80
that the gear screws on the shaft like
a nut on bolt. A circular weight is
fastened to the gear and il slightly
out OF balance. A coil spring connects
the electric motor shaft and the hol-
low screw shaft The relation of these
various parts Is shown In Fig. /.
When the electric motor starts II
drives through the spring and turns
< the screw shaft Because of the
weight the gear is too heavy to turn
with the screw shaft, and because
the gear does not turn It must move
along the screw shaft, just the same
as II you turned bolt having q nut
on It and kept holding the nut with
your fingers TO keep 1t from turning
SO that II would be screwed along the
bolt. ?
After the screw gear has moved
along the screw shaft and engages
with the flywheel gear Il then keeps
on moving along until II reaches the
stop at the end Of the screw shaft.
The two gears then are fully meshed,
and when thesscrew gear has reached
The stop II must turn with the screw
shaft. At this moment the screw shaft
and electric motor are revolving at a
great speed, and this great blow and
the power Of the electric motor both
are taken through the coil spring.
The spring keeps coiling until all this
power has been applied to the fly
wheel gear and the engine starts
turning.
AS soon as the engine starts exploa-
ing and runs under ifs own power the
flywheel turns much faster than when
It was cranked by the starter. Be
cause It IS now turning so much cas-
Ter II increases the speed Of the screw
gear. so that the latter runs faster
than the screw shaft on which It is
mounted. Therefore, when the screw
gear runs faster than the shaft It IL
screwed on the threads of the shaft,
Ike . nut on belt until Il has been
screwed out of mesh with the ny.
wheel gear. This de-meshing move
menf Is entirely automatic and elm
mates the use Of an oyersrunning
clutch.
Automatic Cleaner
Now that the screw gear is out OF
mesh, It is natural 10 suppose that II
the electric motor keeps running the
gear automatically will be screwed
right back into mesh With the fly
wheel gear But the unbalanced
weight on the screw gear now per-
forms its automatic function--that Is,
being slightly out of balance, the
weight twists or cocks the screw
gear so that It clutches and binds.
This automatic clutching Is due to the
centrifugal force Of the unbalanced
on the screw shaft and turns with Il,
weight. When the electric motor
stops running the screw gear has been
fully screwed away from the fly.
wheel gear, and & remains in that
retarded position until II is required
to start the engine.
The gear on the screw shaft has an
automatic self-cleaning action, but,
IN any extreme case, should the gear
tend to stick on the shaft. through
being covered with mud. II may be
necessary TO clean the screw.
The teeth on the screw gear and
flywheel are chamfered. or pointed,
on only one side to make the meshing
natural and easy. However, should
the teeth meet end 10 end. the screw
shaft itself Is designed to move back
ward automatically and compress the
coil spring. This gives the screw
gear time enough to turn and enter
the flywheel gear. Should sticking
of gears ever occur, they can be re-
leased by throwing in the clutch and
moving the car. Such trouble would
be due to incorrect chamfering or In
accurate alignment OF the gears. Al
so IL might be due to the binding Of
The drive parts and prevent compress
ing and proper funcfioning.
II, while the engine Is running, the
electric motor should be started acci-l
ientally, sthe screw gear will screw
over AGAINST the turning flywheel gear.
But instead Of the clashing and smash
ing OF gears that might be expected
there Is no danger whatever, as the
gears simply touch once. This is be-
cause the flywheel gear viii speed up.
the screw gear and thus automatically
screw II away The turning screw.
gear win then automatically clutch,
and bind on the screw shaft, In ex-l
Rctly the same manner as when II Is
cranking and has been demesheda
when the engine starts exploding.
Old Bosch Rushmore Drive
The starter drive used on the old
Rushmore system, which was acquired
By the Bosch Magnetic company and
later known as the Bosch -Rushmore
system, Is feature Of the later Bosch
products with decided improvements.
The old Rnshmore drive Is illustrated
and described herewith. The Bosch
improvements win be taken up later
The construction of the Bosch Rush,
more motor Is such that the arna-
ture can be shifted endwise in its
bearings In the incorporating posi-
ton the armature is held out of its
electric center. or. In other words, out
Of lire with the pole shoes, By . spiral
spring IN the commutator end Of the
armature shaft; therefore, when in
the normal position the pinion on the
driving shaft of the starting motor
Is out OF mesh with the gear ring
on the flywheel Of the engine. Asec.
tional view Of the motor fs shown In
Figure 2
The motor Is provided regularly
with three terminals, two Of which
are heavier or OF larger diameter than
|Ie other. The two heavier terminals
-. RI tie main circuit and The single