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Патент USA US3077551

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Feb. 12, 1963
J. KNALus
ENGINE FLYWHEEL STRUCTURE
Filed June 13. 1960
3,077,541
@î
2
supplied with electric power and is operating as a motor.
A frame extension ."lll‘, which may be cylindrical, ex
lidll’ïîßßil
llames lil. Value, Milwaukee,
@Lift/WHEEL
Wis., assigner to Nordherg
Manufacturing Co., Milwaukee, Wis., a corporation oi
tends along the engine crankshaft el?" and is spaced there-`
from. rthe trarne extension may be integral with the
fran e ft2 or may be a separate section bolted or other
wise secured to the frame. A seal 52 may bc positioned
between the frame extension 5@ and the crankshaft ¿il
adjacent the outer ends or' these two members. Suitable
‘Filed .lune 13, lll/’5th, Ser. No. 35,555
7 Claims. (Cl. 29d-l)
rthis invention relates to automatic power plants or" the
type where a rotating flywheel is used to start a stationary
standby engine upon the failure of the normal electr`c
power supply.
One purpose of this invention is to provide an auto
matic Power plant which is effective to supply standby
axially spaced bearings 5 r- are mounted on the Lrame ex
tension Sil to support the Flywheel ¿le for rotation relative
to the engine frame. A bearing block or mounting block
is'mounted on the trarne portion :lill at the outward
end thereof and has a surface 53 in contact with the right
hand hearing Sei to form a lateral support therefor. Simi
power immediately upon the failure of the normal elec
larly, a surface 59 on the `frame ¿l2 may form a lateral
tric power supply.
support for the left hand bearing. A seal ring
may
be mounted «on the bearing bloeit 56 and positioned in
Another purpose is au improved means for starting a
contact with the liywheel
There may be a similar
standby prime mover for use in a power plant oit the type
seal ring 62 mounted. on the frame ¿l2 at the leit hand
described.
-two seal rings et? and e2: seal
Another purpose is an improved means for mounting 20 side of the structure.
oit the chamber containing the lbearings 5ft to prevent any
a rotating flywheel, used to start a stationary engine, `on
loss of lubricant.
the engine structure.
Other purposes will appear in the ensuing specifica
tion, drawing anc. claims.
The invention is illustrated diagrammatically in the
following drawing wherein a starting~generating dynamo
is indicated at lli. The term starting-generating dynamo
is meant to include any type of unit which may function
both as a generator and as a motor.
For
ln order to lubricate the bearings supporting the ily
wheel de, lthere is a bore or passage
formed in the
frame extension 5G which opens into a chamber or area
do between the bearings. A small cylindrical block or
like 65 positioned in the chamber 66 has a circumfer
cntial inner groove ’le in communication with the pas
sample, a
single machine may ‘oe wired to operate both as a gen»
crater and as a motor, or there may be -a separate alter
nator and a separate motor. ln addition, the term in~
cludcs an alternator and a motor exciter. The novelty
t' this invention docs not reside in the unit indicated dia
grammatically at fr@ and this unit may be any machine
combination which is effective to operate as a motor
when supplied with electric current and to operate as a
generator when driven by a suitable prime mover.
Extending outwardly from the starting-generating
dynamo l@ is a shaft lf2 having `a cylindrical drive adapter
i4 keyed thereto, as at lo. A brush holder lil is mounted
' l1 Jricant, :tor casi
oil, to various
f the chamber circumference.
The engine crankshaft ¿iti has a far outward extension
7d,
-. may be reduced in diameter, and which slidably
supports a coupling member 7e. The coupling
is
keyed or spliced to the crankshaft extension ’7d to pre
vent relative rotation but there is limited axial movement
between the two members. An armature 7d, generally
cylindrical
’76 by a suitable
form,
boltisconnection
mounted on
titl.theAcoupling
cy indrical mag
netic pole piece 82 is mounted on the ilywhccl ¿lo by
means of a cylindrical plate dé and suitable screws 86.
on a cylindrical guard 2li and may have a pair of brushes
"" e magnetic pole piece includes a conventional coil
22. positioned to Contact two spaced slip rings Zfi which
which is connected, through wires not shown, to the in
are mounted about the shaft l2. An insulating structure
sulated pin 2S so that electrical current may ilow to the
26 encloses the sides and inner surface of the slip rings
to electrically isolate the rings from the drive adapter ld
and from the shaft l2. An insulated pin 2S extends
through the drive adapter
and is in electrical contact
with `the slip rings. The pin Ztl may be connected, by
wires not shown, to a magnetic pole piece hereinafter
described. ln operation, the brushes 2.2 will be supplied
with electric current through a switch, not shown, when
magnetic pole piece and induce a magnetic held therein.
This magnetic lield provides the force necessary to hold
the armature 755 against the pole piece and hence form a
coupling between the flywheel do and the engine crank
there is a failure in the normal electrical supply to the
power station. The current supplied to the brushes will
be transferred by the slip rings and insulated pin to the
magnetic pole piece to operate a magnetic clutch herein
after described.
A cylindrical coupling member 39, which may be lami
shaft
The use, operation and function of the invention are as
follows:
Shown and described herein is an automatic power
plant, and in particular improvements to said power plant
relating to the means for starting a stand-by engine. The
power plant includes a starting-generating dynamo, nor
mally operating as a- motor, and, which may "be a single
iachine wired for both generatinÜ and motoring action,
or a separate alternator and a separate motor, or an al
ternator with a motor exciter, or any other combination
nated, is fastened by screws or the like 32 to the drive
adapter
and by screws
to a cylindrical coupling 60 which will provide both a motoring and generating action.
adapter 3o.
Electric power is supplied to the starting-generating
A prime mover, which may be a gasoline engine or
otherwise, is indicated at 3S and has an outwardly ex
tending crankshaft di? and a trame indicated at ft2. The
dynamo which drives a ílywheel mounted on the stand
by engine frame. A magnetic clutch is used to connect
the Flywheel to the engine crankshaft when the normal
trarne il?. has an outer cylindrical portion
which is 65 power supplied to the starting-generating dynamo fails.
connected by screw-s or the like 455 to the guard Ztl, and
As shown in the drawings, electric power will be supplied
defines a cylindrical space within which is mounted a
to the brushes, slip rings, and other eletrical connecting
cylindrical flywheel do. The flywheel is connected to
apparatus upon failure of the normal power supply, so
the coupling adapter S6 by means of screws or the like
that the pole piece §32 of the magnetic clutci will be en
70
and is driven by the shaft l2 through the drive adapter
ergized to attract the armature. Movement oi the arma`
and the coupling adapter. ln other words, the flywheel
will rotate when the starting-generating dynamo l@ is
ture to the pole piece connects the ilywheel and the
3,077,541
3
engine crankshaft and the inertia of the moving flywheel
scribed, the engine and flywheel construction has other
arts the engine.
lt has been heretofore proposed to mount the flywheel
on either the generator shaft or on the engine shaft 1t
uses, for example in a wind machine wherein the force of
the wind is used to rotate the flywheel. The flywheel in
turn may be used to start the engine when the wind dies
self. The generator shaft is normally not constructed
such that its bearings will withstand the heavy load of
down.
Whereas the preferred form of the invention has been
the flywheel. When the flywheel is supported directly _by
shown and described herein, it should be realized that
there are many modifications, substitutions, and alterna
tions thereto within the scope of the following claims.
the engine crankshaft, there will be little or no relative
rotation between the flywheel and the crankshaft when the
engine is operating, and hence the bearings supporting
the flywheel will wear or brincll. An additional disad
vantage in placing the flywheel directly on the engine
crankshaft is that lubrication becomes difñcult. For ex
ample, when grease is used as a lubricant, and the engine
is operated at a relatively high speed, for example 1,800
rpm., depending upon size of the bearing the‘grease
will probably be thrown to the outside of the bearings by
centrifugal force, leaving the inner race of the bearings
l0
I claim:
1. A power plant including an engine having a frame
and a crankshaft, a non-rotatable frame extension con
centric with said engine crankshaft and radially spaced
therefrom, a flywheel concentric with said crankshaft and
supported on said frame extension for rotation relative
thereto, means for coupling said flywheel to sai-d crank
shaft, a starting-generating dynamo associated with said
engine and having a shaft extending therefrom, a drive
between the flywheel and the shaft of the starting-generat
inadequately lubricated. In any event, large bearing sizes
and high speeds will result in improper lubrication with
ing dynamo, and means responsive to a failure in the
grease. When oil is used as a lubricant, it is practically
impossible to pump oil to the bearings as both the fly
current supply to the starting-generating dynamo for
actuating the coupling to connect the flywheel and the
wheel and the engine crankshaft supporting the flywheel
engine crankshaft.
2. The structure of claim l further characterized in
that the coupling between the crankshaft and the ily
wheel is a magnetic coupling.
3. The structure of claim 2 further charcterized in that
ing the flywheel does not rotate, the bearings will not be
said magnetic coupling includes an armature movably
subjected to excessive wear. Similarly, there is no prob
mounted on the engine crankshaft and a magnetic pole
lem of supplying lubricant to the bearings during 4oper 30 piece mounted on the flywheel in spaced relation to` said
ation.
armature such that a magnetic field developed in said pole
piece will attract the armature thereto.
A flywheel, such as that shown herein, develops high
rotate.
To overcome the above disadvantages, the flywheel has
been mounted on a projection of the engine frame which
is connectric with the crankshaft. As the frame support
kinetic energy when rotating and will very quickly start
an internal combustion engine and bring the engine up to
4. The structure of claim 2 further characterized in
that said magnetic coupling includes an armature mount
operating speed.
ed on said crankshaft for limited axial movement and a
There is, of course, some slippage at the magnetic clutch
upon initial contact between the pole piece and the arma
pole piece mounted on said flywheel in spaced relation
to said armature.
ture. However, it has been found, that after approxi
mately two revolutions of the flywheel the engine is up
5. The structure of claim 1 further characterized by
bearings supporting said flywheel on said frame extension.
to speed and there is no more slippage between the clutch 40
6. The structure o-f claim 5 further characterized by
members. The engine presents a very small resistance for
means for lubricating said bearings during rotation of
the flywheel to overcome when starting and hence may be
said flywheel.
quickly brought up to operating speed with minimum
7. A power plant including an engine having a frame
slippage between the clutch elements.
and an engine crankshaft, a non-rotatable frame exten
To quickly summarize the operation, when the normal 45 sion concentric with said engine crankshaft and radially
power supplied to the power station and hence to the
spaced therefrom, a flywheel concentric with said crank
starting-generating dynamo fails, electric current is auto
shaft and supported on said frame extension for rota
matically supplied to the magnetic pole piece for coupling
the rotating flywheel to the stationary engine. The fly
tion relative thereto, bearings between said flywheel and
frame extension, magnetic means for coupling the fly
wheel provides inertia to start the engine and the engine 50 wheel to the crankshaft including an annular armature
concentric with the crankshaft and mounted at the end
thereof, an annular concentric pole piece mounted on
is quickly brought up to operating speed. The engine
then drives the starting-generating dynamo through the
magnetic clutch, the flywheel and the drive between the
flywheel and the shaft of the starting-generating dynamo.
the flywheel in general alignment with and axially spaced
from the armature, a starting-generating dynamo asso
The power station shown herein has particular applica 55 ciated with said engine and having a shaft extending there
from, a drive between the flywheel and the shaft of the
tion at remote radio relay locations, such as used in a
starting-generating dynamo, and means responsive to a
transcontinental microwave system, where it is impossible
failure in the current supply to the starting-generating
to have manual starting of the stand-by engine. ln such
dynamo for actuating the magnetic coupling to thereby
an operation, it is absolutely necessary to continuously
supply power to the electrical equipment and there can 60 connect the flywheel and the engine crankshaft.
be no appreciable time lag between failure of the normal
References Cited in the ille of this patent
supply and the operation of the unit lll as a generator.
The automatic power plant shown herein will quickly
UNITED STATES PATENTS
start and will be driving the generator l@ after no more
2,688,704
Christensen _________ _u Sept. 7, 1954
than -two revolutions of the engine. ln addition to 65
2,972,05 6
Park et al ____________ __ Feb. 14, i961
having utility in an automatic power plant of the type de
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