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Och 15, 1946-
Filed April 7, 1944
lZy/rm/d I’(‘0212.315016]
Patented Oct. 15, 1946
Reginald Trautschold, P assaic, N. J., assignor to
Curtiss-Wright Corporation,
a corporation of
Application April 7, 1944, Serial No. 530,072
10 Claims.
My invention relates to roller arrangements for
conducting electrical current in either direction
between a stationary ring and a collector ring,
slip ring, commutator or the like.
My invention has further reference to a cur
rent-conducting‘ arrangement of the character
stated wherein the stationary ring is spaced from
the collector ring to form a track, rollers being
disposed between and engaging facing surfaces of
(Cl. 171-322)
annular raceway-forming member 6 which is sup
ported in ?xed position in any suitable manner
as, for example, by the integral lugs 6a secured by
the respective screws 1 to suitable ?xed members
8, respectively, the lugs 6a being insulated from
the screws ‘I and the ?xed members 8 as shown.
The insulation is provided by means of a pair of
washers I8—I9 engaging the upper and lower
sides ofthe lugs 6a and a sleeve 20 located be
said rings so as to form parallel current-conduct 10 tween
the Washers and through which screw 1
ing paths therebetween.
is passed. By replacing the washers and sleeves
Various other objects and advantages of my
with similar washers and sleeves of different di
invention will become apparent from the follow
ing detailed description.
mensions, the axis of the stationary ring 6 may
be accurately set to coincide with the ?xed axis
My invention resides in the roller arrange
of rotation of the rotor.
ments for conducting electrical current, combi
The exterior surface of each collector ring 5 is
nations and features of the character hereinafter
circular and this surface is concentrically spaced
described and claimed.
from the interior circular surface of the associ
For an understanding of my invention and for
ated ring 6 so as to form a circular track, The
an illustration of some of the forms thereof, ref 20 annular space formed between the rings 5 and 6
erence is to be had to the accompanying drawing
will be referred to as a raceway. A rotatable cage
in which:
9 ‘herein shown as comprising a pair of spaced
. Figure 1 is an elevational view, partly in sec
separator rings I 0, I0 rotatably supports a plu
tion, showing a roller arrangement of my inven
rality of spaced contact rollers II which are dis
25 posed in the aforesaid raceway. The rings I0,
Figs. 2 and 3 are sectional views taken on the
I0 are secured to each other and maintained in
respective lines 2-2 and 3—3 of Fig. 1 looking
the desired spaced relation in any suitable man
in the direction of the arrows.
ner as, for example, by a plurality of fastening
Fig. 4 is a schematic view illustrating features
units [2, Figs. 1 and 3, each of which comprises
of the invention; and
30 a bolt 14 extending through said rings I0, I0 and
Fig. 5 is a sectional view, partly'in elevation,
also through a spacing tube I5 disposed therebe
showing a modi?cation of the invention.
Referring to Fig. 1, I have shown a rotatable
The'aforesaid contact rollers II are of cylin
structure which, as illustrated, comprises a shaft
drical con?guration and each of them, at its lon
I to which a circular disk 2 is secured for rotat
gitudinal axis, comprises trunnions IIa, prefer- '
able movement as a unit, suitable bearings 3,,
ably. tapered, which extend parallel with the lon
Figs. 1 and 4, being utilized for rotatably sup
gitudinal axis of the shaft I and are journalled
porting the shaft I. Disposed on the outer sur
in alined passages formed in the rings I0, I 0. A
face of the disk 2 is a circular band 4 formed
journal arrangement of this character is desir
from suitable insulating material as known in the 40
able because minimizing the frictional resistance
art. Supported by the band 4 are a plurality of
to rotation of the contact rollers I I.
spaced raceway-forming rings 5 of known con
In accordance with the invention, the arrange
struction such, for example, as collector rings,
ment is such that each of the contact rollers II
slip rings, or a commutator for a direct current
has line contact with the exterior surface of the
machine. As hereinafter referred to, the term 45 associated
collector ring 5 and with the interior
“collector ring” shall be understood as being ge
nerically descriptive of and de?ning either a true
surface of the associated stationary ring 6, these
line contacts of each roller II being substantial
collector ring, a slip ring, a commutator, or the
parallel with the shaft I so that, as the rollers
like. The rotatable structure including the shaft
II rotate, they generate uninterrupted ribbon or
I, disk 2, band 4 and collector ring 5 will some 50 surface contact with the respective rings. As
times be referred hereinafter as a rotor and the
hereinafter described, rotative movement in one
structure including the ring 6 will sometimes be
direction of the collector rings 5 imparts rotative
referred to as a stator.
movement in the same direction to the sets of
Concentrically disposed with respect to and
contact rollers I I and to the respective cages 9.
around each of the collector rings 5 is a ring or 65 For
guiding each set of contact rollers I I and
the associated cage 9 while they partake of rota
tive movement, each collector ring 6 may be
shaped to form sections 6b, 6b which slant in
wardly from the respective opposite sides of that
ring section 60 with which the contact rollers II
engage, It will be understood that other equiva
lent arrangements for accomplishing this pur
It follows, therefore, that the device of my inven
tion serves in its intended manner substantially
in a friction-free manner. This is a feature of
the invention and, by a proper selection of mate
rials for the construction of the raceways 5, Ii and
the rollers I I, electrical losses are held to a mini
Referring to Fig. 5, I have illustrated a modified
form of the invention wherein rollers III‘) of
In accordance with the invention, the collector
rings 5, the stationary collector rings 6 and the 10 spherical, ?attened-end configuration are uti
lized. With the rollers III) of this shape, it will
contact rollers I I should be formed from conduc
be understood that facing surfaces of the race
tive metallic material such, for example, as cop
ways 5a and 5d have proper curved configuration
per or other metal of high electrical conductivity.
to insure flush engagement of said rollers IIb
Materials of this character have good wear-re
therewith. In order for the arrangement of Fig.
sisting qualities and they serve in a satisfactory
5 to be assembled, it will be understood that the
manner as conductors of electricity. The rings
outer raceway lid should be formed from similar
Ill, I0 should be formed from electricty-insulat
as shown, these sections being bolted
ing material such, for example, as ?ber or suit
together as the ?nal assembling step.
able plastic material, these materials being of
With respect to various forms of the invention,
such character that they properly hold the con
roller diameter should be as large as space
tact rollers II in spaced relation and serve as
restrictions permit while, at the same time, hold
proper bearing supports therefor. When the
ing the diameter of the outer raceway to a practi
rings I0, Iii are formed from insulating material
cal limit. As shown by measuring the disclosure
as speci?ed, flow of current from one roller II
Fig. l, the radial dimension of the raceway is
to another roller II by way of said rings is pre
about twenty~two per cent. of the internal radius
vented. This precludes objectionable heating of
of the stationary ring. The roller width, which
the roller trunnion-s I Ia. However, it shall be un
governs the current-carrying capacity, should be
derstood that my invention is not to be limited to
such that the desired current will traverse each
the construction of said rings I0, III from insu~
30 roller without undue electrical resistance being
lating material.
encountered. The number of rollers to be utilized
Referring to Fig. 4, I have diagrammatically
is dependent, as will be understood by those
shown an alternating current motor as compris
skilled in the art, upon the required number of
ing the pole pieces I5 which establish a magnetic
parallel paths between the raceways 5 and 6.
?eld having rotatable therein a looped conductor
It will be understood, with respect to the inven
Ii secured at its ends to the respective collector
tion, that the rollers should have good electrical
rings 5 which, as hereinbefore stated, are secured
contact at all times with the two rings so that
to and rotatable with the shaft I. Conductors I8
conduction of current therethrougli may proceed
are secured to the respective stationary rings 6
in a satisfactory manner.
and these conductors I8, when connected in cir
Although a preferred form of the invention re
cuit with any suitable source of current, not
lates to the use of cylindrical rollers as illustrated
shown, causes current to flow through the looped
in Figs. 1 and 2, it will be understood, as stated,
conductor I‘I. As a result, the rotatable structure
that the rollers may have flattened-end, spherical
comprising the shaft I, disk 2, band 4, collector
configuration as shown in Fig. 5. In another form
rings 5 and looped conductor I'I rotates, for exam
of the invention, true balls or spheres may be
ple, in a counter-clockwise direction, Figs. 1 and 4.
utilized in lieu of the arrangements shown.
As a result, the individual contact rollers II
Hence, in the appended claims, the term “rollers”
are rotated in a clockwise direction, Fig. I, about
shall be understood as being generically descrip
their respective longitudinal axes while, at the
tive of and de?ning true cylindrical rollers, cylin
same time, the two units comprising the rings ID,
ID together with the contact rollers I I are guided 50 drical rollers, having slight taper, i. e. generally
cylindrical rollers, spheres either true or flat
for rotation in a counter-clockwise direction, Fig.
tened, balls, or equivalent.
l, at a velocity one-half that of the associated
In the appended claims, the references to “roll
collector ring 5. At all times, in the disclosed
ing” engagement of the rollers with the rings
form of the invention, the contact rollers I l have
shall be understood as excluding a wiping or slid
line contact with the facing surfaces of the rings
ing action of the rollers on the rings.
5 and 6. Hence, each contact roller I I during ro
While the invention has been described with
tation of the collector rings 5, forms a path
respect to certain particular preferred examples
traversed by electrical current from a collector
which give satisfactory results, it will be under
ring 5 to a stationary ring 6 in one instance and
stood by those skilled in the art after understand
from a stationary ring 6 to a collector ring 5 in
ing the invention, that various changes and modi
the other instance.
?cations may be made without departing from
With an arrangement of the character de
the spirit and scope of the invention and it is in
scribed, the stationary rings 6 are supported by
tended therefore in the appended claims to cover
the members 8. The rotatable structure compris
ing the shaft I, disk 2 and collector rings 5 is sup 65 all such changes and modifications,
pose may be utilized as desired.
ported by the bearings 3. Hence, the weight of
these parts is without effect as regards friction
on the contact rollers ‘II or as regards crushing
effects on the rollers. The only frictional effect,
What is claimed as new and desired to be se
cured by Letters Patent is:
i. In a device of the class described, the combi
nation of a bearing, a rotor including a shaft sup
then, resisting rotation of the contact rollers I I is 70 ported by and journaled in the bearing, a disk
carried by the shaft, a band of insulating mate
that which is created between the trunnions I la
rial encircling the disk, a collector ring encircling
and their respective bearing surfaces together
the insulating band, a stator including a station
with that resulting from the weight of the rings
ary ring, said collector ring and stationary ring
Ill, III, the rollers II and the fastening units I2.
coacting to provide a raceway therebetween, a
This frictional effect is substantially negligible.
cage located in the raceway and free to’ turn
to the radial diameter of the raceway and said
therein about the axis of the rotor and stator
rollers being substantially free of crushing
rings, a plurality of all-metal rollers each jour
naled at its opposite ends in the cage for rotation
5. In a device of the class described, the com
about an axis parallel to the axis of the rings, said
bination of a rotor including a current carrying
cage being formed at least in part of .insulating
collector ring, a stator including a current car
material and acting to insulate each roller from
rying stationary ring coacting therewith to pro
every other roller in the set, said rollers ?tting
vide an annular raceway therebetween, 'a cage
between and in electric engagement with the an
mounted in the raceway for free circumferential
nular faces of the rings which de?ne the raceway 10 rotary movement about the axes of the rings, said
to provide a generated surface contact for the
cage including a pair of axially spaced apart
transference of electric energy between the rings,
rings of insulating material, a plurality of roll
said stationary ring being provided with lugs pro
ers of conducting material in the raceway and
jecting from opposite sides thereof and a pair of
in rolling engagement with both of the current
supports, one for each lug, and insulating means 15 carrying rings to provide paths, one for each
between each'of said pair of supports and its as
roller, for conducting electric energy from one
current carrying ring to the other, said rollers
sociated lug and providing means for adjusting
provided at opposite ends with trunnions jour
the stator ring relative to the collector ring to
naled in the rings, and said rings acting to in
?x their axes in coaxial relation.
sulate the rollers from each other, and spacing
2. In a device of the class described, the com- .
means between pairs of the rollers for securing
bination of a rotor including a shaft and a col
the cage rings in their axially spaced apart rela
lector ring, means for supporting the rotor and
tion, and the stationary ring provided with
for ?xing its axis of rotation in space, a stator
means coacting with the rollers to maintain the
including a stationary ring encircling the col
cage substantially centered in the raceway.
lector ring and coacting therewith to provide an
6. In a device of the class described, the com
annular raceway therebetween, metallic conduct
bination of two current carrying elements, one
ing rollers in said raceway and disposed with
constituting a collector ring mounted for rotary
their peripheral surfaces in rolling electric con
movement about its own axis, and the other a
tact with both the collector and stationary rings
and insulating means independent of the rotor 30 stationary ring encircling the collector ring and
coaxially disposed relative thereto, the opposing
and its supporting means for supporting the sta
surfaces of the rings coacting to form an annular
tionary ring in place, said two supporting means
raceway therebetween, one of said elements com
cooperatively providing for relative adjustment
of the rotor and stator to locate their axis in the 35 prising two similar sections divided along a me
dial plane perpendicular to the axis, and said sur
same line and thus insure equality in the radial
face of each section provided with an inclined
dimensions of the raceway.
portion, said inclined portions coacting to pro
3. In a device of the class described, the com
greater width to the raceway at its midwidth
bination of two supports independent of each
other, a shaft journaled for rotary movement in 40 than at its ends, and a set of rollers in the race
way and in rolling engagement with both of said
one of said supports, a collector ring carried by
opposing surfaces.
and rotated by the shaft, a stationary ring car
'7. In a device of the class described, the com
ried by the other support, disposed concentric with
bination of a pair of annular elements capable of
the collector ring and coacting therewith to form
transmitting electric energy but structurally not
an annular raceway therebetween of equal radial
intended to transmit mechanical loads, said ele
dimension, a circular unit mounted for free rotary
ments including a collector ring mounted for ro
movement circumferentially in the raceway, said
tary movement, a stationary ring surrounding
unit including a cage, a plurality of rollers jour
collector ring and coacting therewith to form
naled in the cage and whose perimeters are of
an annular raceway, said stationary ring having
conductive material and in direct metal to metal -.
substantially all of its surfaces exposed for air
electric contact with both rings, said collector
and stationary rings being supported independ
cooling, having structural strength at least suffi
cient to maintain its con?guration in use and
free of any weight distorting strains, and a set of
the transference of weight through the rollers
rollers in said raceway in light frictional‘
and thereby to minimize wear of the rollers and 55 metallic
engagement with both of said rings substantially
free of crushing strains and capable of transmit
4. In a device of the class described, the com
ting electric energy from one to the other ring
bination of mechanical elements capable of trans
but not intended to transmit loads from one ring
mitting electric energy but structurally too weak
to the other.
and not intended to transmit mechanical strains, 60
8. In a device of the class described, the com
said elements including two rings, one forming
bination of a collector ring, a stationary ring en
a collector ring and the other a stationary ring
circling the same and coacting therewith to form
encircling the collector ring, said rings being in
an annular raceway, said rings being formed of
concentric relation for relative rotation about a
common axis and forming a raceway between of 65 conductive metallic material of high electrical
conductivity, a set of all-metal rollers in the race
equal radial dimensions, the opposing surfaces - way each providing good metal to metal electric
of which raceway are of conducting material, a
contact with each of the rings and an electric
set of rollers in said raceway each journaled for
path therethrough from one ring to the other,
rotary movement about an aXis parallel to the
there being as many electric paths in parallel
axis of the rings and provided with a conductive 70
the rings as there are rollers, and means
periphery in direct electric contact with both of
insulating the rollers from each other, the rollers
said opposing surfaces to provide a generated
?tting between the rings being in light frictional
surface contact for the transference of electric
engagement therewith but substantially free of
energy from one to the other ring, the diameter
crushing strains.
of said rollers being equal to each other and equal 75
9. The device defined in claim 8 and in which
ently of each other and operating to minimize
the radial dimension of the raceway is relatively
large, that is of the order of about one-quarter
of the internal radius of the stationary ring to
permit the use of large rollers and the length of
the straight line of contact between each roller
and the rings being materially greater than the
diameter of the roller so that each roller can pro
vide a long line of contact and thus cause the
several rollers collectively to carry the current
without undue electric resistance.
10. In a device of the class described, the com
bination of two conductor rings mounted for rela
tive rotary movement about a common axis and
sulating material, a plurality of rollers located be
tween the rings and having trunnions of conical
form journaled for rotary movement in the rings,
the rings provided with opposing sockets of con
ical form with their larger ends facing inwardly
towards each other and disposed to receive the
trunnions and said cage-forming rings acting to
maintain the rollers insulated from each other
and spaced apart circumferentially of the con
ductor rings, means tying one of the cage rings
to the other to complete the cage, the perimeter
of each roller being in rolling contact with both
conductor rings and each generating uninter
ribbon or surface contact with both of the
forming therebetween an annular raceway, an
annular structure mounted in the raceway for 15 rings.
free rotary movement about said axis, said struc
ture including a pair of cage-forming rings of in
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