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Патент USA US3096939

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July 9, 1963
Filed Feb. 1, 1962
FIG. l
30 33 R‘
60 65
H6. 2
United States Patent 0
Patented July 9, 1963
particularly with respect to its reversed air flow arrange
ment similar to 2,888,192.
Albert L. Sebok, Tallmadge, and Frank Z. Daugherty,
Thus the motor section of the unit, here shown as a
commutating motor, is comprised of the member 10 hav
ing two sets of the diametrically disposed projections 11,
12 extending outwardly from a main disk-like portion
13 and equi-spaccd from a bearing receiving socket for
Kent, Ohio, assignors to Ametek, Inc, New York, N .Y.,
a corporation of Delaware
Filed Feb. 1, 1962, Ser. No. 170,447
6 Claims. (Cl. 230-117)
mation 14, a ?eld core structure including a wound stack
The present invention is concerned generally with a
15 of iron laminations supported on the projections 11,
motor-fan unit especially one intended for use in a 10 12, a commutator end bracket 17 supporting a diametri
vacuum cleaner or similar environment, and more par
cally opposed pair of brush holder units 18 and includ
ticularly with a “reversed flow” type unit; that is, a unit
of the type described, wherein there is established a
path for air traversing ?rst .a motor section of the unit,
and thereafter the vacuum fan section of the unit.
In the case of a unit including a commutator type mo
ing a bearing socket formation 19, and a rotor 20 shown
as an armature having a shaft 21 rotatably supported by
hearing units 22 and 23 in the socket formation 14 and
19 respectively.
Here the conventional ?eld windings
and brush leads are omitted for clarity of representation.
tor, the air ?rst traverses the brushes and commutator;
The end portions of the projections 11, 12 have in
thereafter the stator or ?eld, interiorly or exteriorly or
terior \arcuate rabbets, co-axial with the bearing socket
both; and, of course, with interior traverse of the ?eld,
14 and therefore with shaft 21, engaging the radial end
also passes the exterior of the rotor or armature.
20 face and circular arcuate portions or cylindrical portions
The reversed air ?ow arrangement as such has well
known characteristics. Since air ‘available for motor
cooling is not, as in the case of “direct ?ow” units, pre
of the core 15 while the commutator end bracket 17
gether by a pair of diametrically opposed bolts 27 passed
exteriorly of the core 15 through corresponding bosses
has a rabbeted rim formation at 24 similarly engaged
with the opposite end of the ?eld core. The ?eld wre
heated by passage through the fans of air impellers, it
15 has a generally cylindrical circumference at least at
allows higher operational power levels for the motor. Also 25 the end portions, though it may be ?attened or have longi
for certain vacuum cleaner environments, the geometry
tudinal grooves and the like for accommodation of coil
of the reversed-flow motor-fan unit structure is advan
end securing strips and the like.
tageous in allowing a more compact overall cleaner struc
The components of the motor portion are secured to
However, in a reversed ?ow unit, ‘a loss in fan e?iciency
results in consequence of the heating of air passed ?rst
through the motor, and also a noisier operation, be
cause of the absence of a certain fan-noise muf?ing elfect
usually present in a “direct flow” unit by the passage of
28 of the commutator end bracket and threaded into the
ends of the projections 11 of one set. In the case of a
commutator motor, as here shown, the bosses 28 have
bolt receiving arcuate slots concentric with the shaft of
the fan-discharged air through the motor-untoward re
the rotor or with the axis of the socket 19 permitting a
sults ameliorated in some prior art motor-fan units by
limited rotational adjustment or setting of the brushes rela
use of an adequate diffuser construction at the fan dis
tive to the poles of the core 15, for which purpose prefer
charge. Nonetheless even in such units as have diffusers
a-bly there is also included means (not shown) for lo
with ?xed vanes, cavitation of air pulsation occurs at some
cating the core 15 in rotational sense in a de?nite posi
rates of air discharge.
40 tion relative to member 10. As thus far described the
An object of the present invention is to provide a
motor structure is generally similar to that of the afore
compact reversed-?ow type motor-fan unit construction
mentioned Cole patents.
with a relatively small number of parts and having a
Means of conventional and known type may be in
diffuser system for the fan discharge.
cluded between the outer races of the bearing units and
Another object is to provide a reversed-?ow motor-fan
end wall of the bearing sockets for retaining lubrication,
unit of increased et?ciency, reduced noise and with little
and so also spring means acting on the outer races to pre
tendency {to cavitation within its operating range.
load the bearings for quieting of bearing operation, per
A further object is the provision of a plural stage motor
mitting some slight axial ?oat of the rotor 2G.
fan unit with an improved inter-stage air guide vane
The disk portion 13 of member 10 provides an end
assembly mounting.
50 wall for the fan housing and through an offset portion
Other objects and advantages of the invention will ap~
30 supports an axially extending or cylindrical ?ange
pear from the following description and the drawings,
portion 31 and through a short radial wall portion 32
on the external circumference of 31 also supports a
FIG. 1 shows a motor-fan unit embodying the present
backwardly o?'set mounting rim 33.
invention partially in side elevation and partially in
Outside of the ?ange 31 there is provided a circum
axially longitudinal section taken at about 90° from the
ferentially spaced series of integral vanes or ribs 34
elevation with certain parts being omitted for clearer rep
(see also FIG. 2) running endwise out from the right
resentation of the structure characteristic of the inven
face of wall portion 32. These vanes are preferably
disposed with center planes at 45° to respective axial
FIG. 2 is a detailed view showing the angular rela
planes of the unit passing through their external edges,
tions of diffuser vanes in the outlet of the unit; and
and in a typical case twenty-?ve equally spaced ribs are
FIG. 3 is a detailed view showing a modi?cation in
the manner of mounting certain internal elements of the
These vanes also support a drawn sheet metal, some
what cup shaped, second stage fan housing 36, the outer
As shown in the drawings the vacuum cleaner motor
ends being sloped at 37 to facilitate the ?tting of the
fan unit of this invention comprises the motor M and the
cylindrical wall portion 36a of the shell on the vanes.
fan section F wherein a fan housing base element and a
Preferably at vanes 34, member 10 is turned down to
bearing supporting bracket or frame end member in the
form a shoulder 38 against which the edge of wall 36::
motor frame are incorporated as integral parts of a
abuts on each vane, and also outwardly from the
single member designated by the general reference char 70 shoulder a notch 39 whereby the edge of the wall 36a
acter 10 in an overall arrangement similar to that ap
pearing in the Cole Patents 2,713,455, 2,822,122, or more
may be staked inwardly at a plurality of the vanes, as
at 40 in FIG. 1, to retain the entire shell 36 axially in
position. Also for this purpose the vanes ‘may be
somewhat thickened at the locations where the staking
is to occur as ‘at the vane 34a in FIG. 1, and addition
ally the shell edge may be staked or sheared down
tering the outer ends of the vanes of the ?xed blades
in the ?rst stage chamber.
It will be‘ noted that the offset portion at 30 results
in a shallow face recess on the fan side of disk 13 and
that the disk 54 of the ?rst stage impeller is just re
ceived in this recess; ‘and that the spacing of the ?ange
prevent rotational displacement of the shell.
31 beyond the circumferences of the ?rst stage im
The interior peripheral edge of ?ange 31 may be rab
peller and the stationary vane assembly provides a cir
beted at ‘43 to an axial depth somewhat greater than
cumferential space for passage of ‘air from the outlet
and providing a seat for the edge of an annular sheet
ends of the ?rst stage impeller inter-vane passages into
metal baf?e disk 45 further described hereinafter. Again
the outer circumference of the stationary vane assem
the edge of the ?ange outward of the rabbet 43 may
bly; while the equally sized discharge opening of the
be staked inwardly for retention of the plate 45.
stationary vane assembly and the second stage impeller
The annular plate 45 and the portions 13, 30 and
inlet along with the grooved circumference of the spool
?ange 31 provide a ?rst stage housing or chamber hav
58 provide a passageway from the outlet of the ?rst
ing a central air inlet 47 spanned by a plurality of in
stage into the impeller inlet of the second stage. Also
tegral webs or spider formations continuous with the
the circumferential spacing of the cylindrical wall 36a
reinforcing rib-s 29 on the back face of disk 13 and run
from the discharge at the peripheral circumference of
ning out approximately to the rim 33 ‘for support in
the second stage impeller provides an annular circum
central location of the bearing socket 14.
ferential channel receiving the air discharged by the
The construction of the indentical fan impellers or 20 second stage impeller. This latter described channel or
rotors 50, 51 respectively for the ?rst and second fan
passage discharges air axially through the longitudinal
stages, and the clamping of the same on the motor
passages provided ‘between wall 360, ?ange 31 and vanes
shaft are well known and conventional. Each impeller
34, which air ultimately encounters wall 32 and dis
comprises a sheet metal disk 52 centrally apertured to
charges laterally between the blades 34, wall 32 and
receive the motor shaft, a plurality of spaced vanes 53
the edge of 36a.
and an annular sheet metal disk 54 having an opening
With this overall arrangement, a reversed ?ow is ob
or impeller inlet by virtue of the large aperture of the
tained; that is, the air is drawn in and around the motor
annular disk at the edge of which the inner ends of
from the commutator end passing through the com
wardly on opposite sides of the vane as at 41, 41 to
the vanes 53 are located.
The inner race of bearing unit 22 at one end abuts
against a shoulder on the rotor of the motor, the end
of the cylindrical portion of a ?anged collar 56 abuts
against the other end of the inner race, the ?rst stage
impeller disk 52 is sandwiched between the ?ange of
collar 56 and a spool-like spacer element 58, the disk
52 of impeller 51 is sandwiched between the spool 58,
and a clamping washer 59 and all elements are clamped
on the shaft by clamping nut 60 tightened down the
mutator bracket around the brushes and between the
?eld core and armature to reach the ?rst stage inlet
47, it also being possible for air to pass around the
outside of the motor between posts 11——12, the core
and the end plate 13 to reach the fan inlet.
We claim:
1. A motor-fan unit of reversed ‘air-?ow type com
prising: a motor stator; a motor rotor including a shaft;
?rst and second motor end ‘brackets on respective opposite
ends of the stator, and having central socket formations
threaded end of shaft 21 projecting from the motor
supporting bearings for said shaft; the said ?rst bracket
proper into the fan unit. A stationary vane and bai?e 40 having apertures therethrough surrounding the socket
assembly, again of known and conventional general
therein providing air inlet means; said second bracket be
form includes an annular disk 62 having a central aper
ing an integral structure including a generally disk-like
ture closely spaced with running clearance from one
portion having ‘as for air inlets arcuate apertures around
end of spool 58, a series of like circumferentially spaced
the corresponding bearing socket formation ‘thereof, a rim
guide vanes 63, and the plate 45 assembled into a unit
portion including a cylindrical ?ange concentric with the
supported in the fan housing by the connection or seat
socket of the said second member extending endwise out
ing of the plate 45 as previously described; While the
wardly from the motor portion of the unit, and circum
plate 45, as a ?rst stage discharge outlet, has a large
ferentially spaced diffuser vanes on the cylindrical ex
central opening, similar in form to that of the im
terior of said ?ange; fan impeller means disposed end
pellers and located at about the middle of the arcuate
wise outwardly beyond said ?ange on an end of said shaft
cross-sectioned circumferential groove provided in the
spool 58 as an air guide means turning and guiding the
air discharging from the ?rst stage into the impeller in
let of the second stage.
The end wall of the shell 36 is centrally dished out- Y
wardly at 36b and has a central aperture closed by a
projecting through the said second bracket; and generally
cup-shaped fan shell means including an end wall and a
cylindrical portion, said cylindrical portion being ?tted
over a part of the length of said vanes to provide a cir
cumferential series of longitudinally directed air outlet
passages from said impeller, said passages opening radial
removable plug disk 65 to provide access to the clamp
ly outward of said ?ange.
ing nut 60 for purposes of balancing the impeller and
2. A vacuum motor-fan unit as described in claim 1,
motor assembly.
including two fan stages; the said impeller being a second
FIG. 3 shows a modi?cation in the mounting of the 60 stage impeller; a ?rst stage impeller mounted on said shaft
stationary guide vane assembly on the ?ange 31. Here
disposed proximate to said disk portion and having a
the free edge of the ?ange 31 is rolled or deformed in
central air inlet receiving air from said arcuate apertures;
wardly to provide an inwardly extending bead or lip
a stationary interstage air guide vane assembly disposed
70, and the plate 45 along its perimeter has a folded
between said impellers including an annular disk periph
portion generally V-shaped in cross-section providing a
erally engaged with said ?ange and providing a central
peripheral rim portion 72 generally cylindrical in ex
aperture as a discharge opening to the inlet of the second
stage impeller, a second annular disk with a central aper
ternal form to conform to the interior of ?ange 31, the
ture having a close running clearance relative to the shaft
free edge of the portion 72 being curved inwardly and
then re?ected radially outwardly at 73 to provide an 70 structure, and a plurality of vanes each extending sub
stantially from said central opening to the outer periphery
interlocking engagement with the lip 70‘, the curva
of said second disk.
tures being exaggerated at 73 ‘for purposes of clarity.
3. A vacuum motor fan unit as described in claim 2,
The wall portion 74 into which the plate 45 ?rst is
wherein said ?ange has an internally rabbeted free edge
re?ected inwardly also has a slope in an axial sense
providing a seat for a peripheral edge of the ?rst said
to serve in some degree as a guide element for air en
disk in said interstage vane assembly, said peripheral
edge being deformed over the vane assembly edge for
retention of the latter.
ing bearing socket formation thereof, a rim portion in
cluding a cylindrical ?ange concentric with the socket of
the said second member extending endwise outwardly
4. A motor-fan unit as described in claim 2 wherein
said ?ange has a free edge off-set inwardly from the gen
from the motor portion of the unit, and diffuser vanes
on the exterior of said ?ange; tan impeller means disposed
endwise outwardly beyond said ?ange on an end of said
shaft projecting through the said second bracket; and gen
erally cup-shaped fan shell means including an end wall
erally cylindrical form thereof; and the exterior peripheral
edge of the ?rst said disk in said interstage vane assembly
includes a rim formation inserted within said ?ange, said
rim formation having a portion deformed inwardly ‘and a
and a cylindrical portion, said cylindrical portion being
second portion re?ected outwardly in contact with said 10 ?tted over a portion of said vanes to provide axially di
?ange, the second portion having a groove formation
rected air outlet passages from said impeller opening
engaged with the free off-set edge of said ?ange.
radially outward of said ?ange; said vanes extending gen
5. A motor-fan unit as described in claim 1 wherein
erally parallel to the axis of said shaft, but each being gen
said disk-like portion of the second member includes
erally obliquely disposed to a plane including the shaft
spaced post formations projecting toward and engaging 15 axis and passing approximately through the middle region
the adjacent end of said stator, thereby to provide access
of air over the exterior of the stator to the air inlet forma
tions of said disk portion.
6. A motor-fan unit of reversed air-?ow type compris
ing: a motor stator, a motor rotor including a shaft; 20
?rst and second motor end brackets on respective opposite
ends of the stator and having central socket formations
supporting ‘bearings for said shaft; the said ?rst bracket
having apertures therethrough surrounding the socket
therein providing air inlet means; said second bracket 25
being an integral structure including a generally disk-like
portion having arcuate apertures around the correspond
of the respective vane, each vane having its inner edge
advanced into the direction of notational approach of said
References Cited in the ?le of this patent
Fors'berg ____________ __ Nov. 19,
Martinet ____________ __ Apr. 21,
Cole ________________ __ July 19,
Cole ________________ __ Feb. 4.
Cole et a1 _____________ __ May 26,
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