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Патент USA US2412432

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Dec. 1o, 1946.
c. E. TACK
2,412,432 _
I BRAKE ROTOR
Filed April 26, 1945
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Dec. _110, >1946.
2,412,432
c. E. TA‘cK`
BRAKE ROTOR
Filed April 26, 1945
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2,412,432
Paientecì Dec. 10,1946A
unirse STATES PATENT OFFICE
BRAKE Ro'roR
Carl E. Tack,l Chicago, Ill., a‘ssîgnor to American
Steel Foundries, Chicago, Ill., a corporation of
New Jersey
Application April 26, 1945, Serial N0. 590,393
15 Claims. (Cl. 18S-218)
1
My invention relates to brake equipment and
particularly 'to a novel form of rotor designed to
be associated with other braking means common
ly called stators whose engagement with said ro
tor is commonly utilized as a means of stopping
2
prevents the ñlm 0f air from insulating the said
surfaces and thereby effecting greater cooling of
the friction plates.
t
While rotors of the double inlet blower type
areA thus more satisfactory than the single inlet
type, in the first-mentioned type of rotors cer
a wheel or other rotating member.
,
tain disadvantages exist in their use in railway
My novel rotor is particularly adapted for use
rolling stock. An important disadvantage arises
with railway rolling stock, although it will be un
in the failure to provide for the radial expansion
derstood that such a rotor may be utilized for any
equivalent purpose for which it may be readily 10 of the rotor brake ring relative to its supporting
member due to the tremendous heat energy in
adapted.
4
duced in the brake ring during a braking opera
Brake rotors of the double inlet blower type
tion and the consequent differential in tempera
are generally preferred in the art over rotors of
ture of the same and the support member where
the single inlet blower type. While both types of
rotors are usually supported by a disclike sup 15 by the support member tends to remain in a static
condition while the brake ring tends to expand
port member for the strength and rigidity af
radially of the support. This result is at
forded thereby, in the latter type of rotor, the
tributable to the fact that the rotor may be
support member is connected at its inner circum
formed entirely of iron or steel whereby the
ference to the wheel or member to be braked and
heated brake ring will tend to expand radially
has its outer circumference formed integral with
outward of the relatively static cooler support
or imbedded in one of the friction plates of the
member, or that, in a two-piece rotor, the support
rotor, whereby a static air space is -had between
member is usually formed of a metal, such as steel,
the said friction plate and the support member.
having a higher tensile strength and different co
As a consequence, a portion of the tremendous
heat energy in the friction plate induced by the 25 eñicient of expansion than the metal of the brake
ring which is almost invariably cast iron for its
braking operation is absorbed by the static air
superior friction qualities. Thus, brake rotors of
which then fails to effect the necessary rapid ab
the type having the brake ring integral with the
sorption of the heat from the plate to prevent ra
support member or connected thereto by imbed
dial expansion of the latter with the result that
undesirable thermal stresses occur in the friction 30 ding the support in the brake ring by utilizing ele
m'en't‘sof keystone or tapered form integral with
plate which may cause radial> cracking of the
oneY member in complementary interlocking en
plate itself and breakage of the plate and also as
gagement'with the other member, prevent the ra
sociated portions of the rotor.
i
dial expansion and contraction of the brake ring
In the double inlet blower type, the support
member is secured to the blades or vanes between 35 and the resultant undesirable thermal stresses in
the rotor’often cause cracking of the plates and
the friction plates in a two-plate rotor and to the
the associated portions of the rotor.
central plate in a three-plate rotor, whereby a
Various" attempts have been made in the art to
continuous iiow of air is had from the space bef
provide a brake rotor of the last-mentioned type
tween the wheel and the adjacent friction plate
of the rotor by the air being drawn from the 40 which would satisfactorily accommodate radial
expansion and contraction of the plates relative
space by the blades into the rotor, effecting a flow
tothe support member without setting up unde
of cooler air into the space with the result that
sirable thermal stresses. It has been attempted
the heat is conducted from the plate and dissi
in one instance to remedy this problem in the art
pansion of the plate and diminished thermal 45 by providing an annular support member formed
of flexible sheet metal having a bent or corru
stresses in the rotor.
gated annular portion concentric with and eX
Another disadvantage of the single inlet blower
tending around the support member between its
type is that a laminated film of air tends to re
connections to the wheel and brake ring whereby
main present on the inner surfaces of the friction
plates of the rotor which serves to insulate said 50 upon radial expansion and contraction of the
friction plates, the corrugated portion of the sup
surfaces and to prevent cooling thereof by the air
port will -expand or contract radially vconcurrent
passing through the rotor, whereas in the rotor
ly with the plates to prevent stresses in the ro
of the double inlet blower type, a turbulent flow
tor. This design of rotor is impractical »for the
of air is had through the rotor from the air floWing in on both sides of the support member which 55 repeated expansion and contraction of the cor
pated to an extent insuring a lesser radial eX
2,412,432
3
Y
.
being taken through the rotor in a plane similar
rugated portion of the support soon causes fa
tigue in the metal forming the same and resultant
to that of Figure 4.
Figure '7 is a sectional view taken in the plane
cracking of the support along this portion. Also,
indicated by the line 7-'1 of Figure 6, and Figure i
8 is an enlarged sectional View taken in the plane’
formation of the support member of a flexible
metal is disadvantageous as axial movement of
the member may be readily had by the failure of
concurrent application of the stators to the fric
tion plates which causes distortion of the sup
port member and also induces fatigue in the cor
rugated portion by the constant bending there
indicated by the line 8_8 of Figure ’7. Y
inclusive in detail, the rotor comprises a'rotor
support’generally designated 2, said rotor support
10 being a rigid steel member of disc-like form in
cluding a hub portion 4 integrally formed with'
of. A support member having these character
istics can not be formed rigid enough for service
a bell-like member 6, the shape of which is best
indicatedinFigures 2 and 3. The hub portion 4`
and still have the requiredy ñexibil-ity fo11 radial
expansion and contraction.
`
'
'
Describing my novel rotor shown in Figures 1-6 e
` of thesupport member 2 comprises a plurality of
’
spaced bosses 8, 8 and a plurality of openings I0,
It is an object of my invention to provide a
HJ extendingV therethrough' and through said
novel rotor of the double inlet blower type com-w
prising a brake ring and a'rigid support therefor
bosses. It will be readily apparent to those skilled '
in the art that the bore I2 in the hub portion 4
connected in such manner that radial expansion
may be fitted over a complementary portion on
and contraction of the brake ring is freely ac
commodated by the support member While cir 20 an associated rotating member and may be se
cumferential and axial Vn’ioven'lent of the brake
cured thereto by any convenient means suchras
bolts (not shown) extending through the open
ring relative to the support member is prevented.
ings lll, Il), said hub portion d being reinforced
Another object of my invention’is to provide a
rotor of the type described wherein the connection
at its points of connection to said rotating mem
between the brake ring and the support is in
ber by the bosses 3, 8.A It may be noted from a
consideration of Figures 2 and 3 that the shape
the form of a mechanical expansion joint for
the purposes above described.
of the bell-like member t and `t-,helsubstantial
A still further object of my invention ris to'
thickness of the same affords a support member 1
of substantial strength and rigidity for resisting
provide a rotor of the type described wherein the
support member is connected to the b-lades of the 30 movement in an axial direction relative to the
wheel during the brakingV operation. ,
e
brake ring in such manner that relative move
The brake ring, designated as a whole by refer
ment between the ring and member is 'afforded
in a vradial direction and prevented in circum
ence character Ill, is ofthe double inlet blower
ferential and axial directions.
type and formed preferably of cast iron and is
Y
My invention contemplates a design of rotor 35 cast about the outer circumference of the bell
comprising a brake ring having a pair of friction
like member 6 of the support member 2 and con-_
plates connected together and formed integral
nected thereto in a novel manner vhereinafter
with a plurality of blades extending therebe
described. The brake ring is an integral casting
comprising two spaced friction plates I6 and Vi8,
tween, and wherein` one embodiment of my in
vention a rigid annular support member is formed 40 each of annular form and arranged in parallel
with radial notches in the outer perimeter there
planes, and each having a Vfriction surface 2!)v
of slidably receiving portions ofY the blades there
in and the blades extend downwardly along the
opposite sides of the support in slidable engage
ment therewith whereby radial movement of the
plates I6 and i8 are a series of radially extending
and equally spaced blades 22 each having arela- Y
brake ring relative to the support member is ac
tively thick portion 24, wedge shaped in side
commodated and relative axial andY circumfer
ential movement of the brake ring 'and support
elevation and in cross section,V forming its inner ~
edge and projecting radially-inwardly of the fric- f
member is prevented.
tion plates I6 and i8 and connected intermediate
the lateral ends thereof to the member 6 of the
support 2, as clearly seen in Figures 3, 4' and 5.
It may be noted that the arrangement described
provides a rotor wherein the air inlets yfrom the
inbo'ard and outboard sides of therotor are illus
for engagement in usual ¿manner with stators
(not shown).
`
In the other embodiment of my invention the
bra’keV ring is Yconnected tothe support member
Integrallyy joining the rfriction
by forming each of the blades of Ythe brake ring
with a transverse slot in its inner' edge slidably
receiving the outer perimeter of the support mem
ber, and wherein the adjacent portions of the 55 trated by the curved Varrows A Yand BlFigure 3');
whereby, during the braking operation;A cooling
member on the opposite sides of each blade ex
tend outwardly along the blade yand slidably en
air is drawn into the rotor from opposite sides
of the support-member by 'the blades and turbu
gage the same for obtaining the above described
desirable results.
In the drawings:
'
60
Figure 1 is »a side elevation of one embodiment
of my novel form of rotor.
Figure 2 is an edge View taken from the left
as seen in Figure 1 with a portion of the rotor
out away along the `radial planes indicated by
the line 2-2 Vof Figure l. '
lently flows through the rotor, rthereby effecting
,
Y
.
Figure V3 is an enlarged sectional View taken in
the radial planes indicated by the line 3-3 of
Figure 1.
Figure 4 is an enlarged sectional view taken in
the plane indicated by the line 4,-4 of Figure 3. f
Figure'ö is an` enlarged sectional View taken in
the plane indicated vby the _line 5-,5 ,of Figure 3.
Figure 6 is _afragmentary sectional view of an
other embodiment of my invention, the section
dissipation of a portion of the-heat energy in`
the friction plates induced by their YengagementY
with the stators (not shown).
W
,
Y
While roto-rs of the double inlet> blower` type,
as well as rotors of the single inlet blowertype,
effect a certain amount of cooling of thefriction
plates of the rotor by-circulation of cooling air
through the rotor and _about the friction faces
of the plates, a substantial portion of the heat '
energyin the friction plates, resulting <from the
70 braking operation, isY retained in «the plates/andV
connecting lb-lades causing radial Lexpansion of the
`plates relative to' the support member ,as the
latter member can not absorb sufficient heatrap
idly enough from the frictionl'plates to expand
uniformly and concurrently with the plates. `
9,412,432
5
Rotors of practical design necessarily utilize a
rigid support member, usually formed of a vmetal
having a high tensile strength, such as steel, to
insure adequate strength and toughness, and the
brake ring is usually formed of cast iron, noted
as being among the best materials for »providing
friction or braking surfaces but having a coefli
cient of expansion different than steel. Rotors
of the double inlet blower type in the art utilizing>
ures 3 and 5 thatthe blade portions 40 oneach
side >of the projection in the slot' in' each blade
engage the circumferential outer face of the bell
like member E and also that the `thick'ene'dfportion
24 of »each` blade extends outwardly of the inboard
and outward sides of the member t, whereby the
connection of the blade to the support member
is substantially strengthened and resistant to
relative movement between the brake ring and
a rigid steel support member and a cast iron 10 support member except movement ofthe brake
brake ring have usually been formed with the
brake ring-having the support member integrally
ring radially outward of the support memberdur
ing the braking operation.
-
~
In the embodiment of the invention shown in
joined thereto or connected thereto by keystone
Figures 6 and '7, the support member and brake
orI tapered means preventing relative radial
movement between the brake ring and support 15 ring are formed substantially identical as those
previously described, the brake ring comprising
member, whereby the wide differential in tem
the spaced annular friction plates m2 and-|04
peratures of the brake ring and support member,
causes the brake ring to expand-substantially
connected by a plurality of radial blades lßö'ex
tending therebetween. Each blade HBS is formed
faster than the support member in a radially
with the inner extremity thereof extending radi
outward direction inducing undesirable stresses
ally inwardly of the friction plates and having a
in the plates which may crack the same and other
substantially uniform thickness throughout its
portions of the rotor, impairing the braking abil
length. In the present embodiment of the inven
ity of the plates and causing possible breakage
tion the outer perimeter of the rigid support
of the rotor.
My invention resides in solving this problem 25 member §08 is received within a notch I lû formed
in the inner extremity o-f each blade and extend
in the art by connecting the rigid support mem
ing transversely therethrough, the inboard and
ber 2 and the brake ring I4 in such manner that
outboard sides l i2 and H4 of the outer perimet
in service the brake ring may expand radially
rical edge of said member slidably engaging the
outwardly of the support member during the
braking operation, while relative axial and cir 30 surfaces defining opposite sides of the notch in
each blade. Theouter perimeter of the support
cumferential movement of the brake ring and
member is formed at its juncturewith each blade
support member is prevented at all times. To
with U-shaped bosses H6, H6 on opposite sides
this end and referring now to Figures 2 to 5
thereof having aligned slots H3, H8 in the plane
inclusive, the brake ring is cast about the outer
perimeter of the bell-like member 8 of the sup 35 of said blade receiving the blade and having the
sides §23 and §22 defining the slot H8 in each
port 4, the latter portion of the member 6 having
boss inslidable engagement with the opposite
been previously formed with a plurality of equally
sides of the blade. It will be apparent that ex
spaced notches 26 radially arranged and extend
pansion of the brake ring in the direction radially
ing transversely through the outer circumferen
tial edge thereof, each notch being formed with 40 outward of the support member will be freely
accommodated by the slidable engagement ofy the
substantially parallel plane faces 28 and 38 for
blades of the brake ring with the support member
slidab-ly engaging a projection 32 formed in a slot
34 extending transversely of the portion 24 of
and that relative axial movement of the brake
ring and support member is prevented by the
the blade intermediate the ends thereof, as clearly
engagement of the surfaces defining the opposite
shown in Figures 2, 4 and 5, the inboard and out
sides of the notch IIB in each blade with the
board sides of the member 6 adjacent the outer
perimetrical edge thereof slidably engaging the
inboard and outboard sides H2 andv H4 of the
support member. It will be clearly `apparent that
sides 36 and 3d defining the slot 34 in the blade.
relative circumferential movement of the brake
To permit relative movement between the brake
ring and the support member in a radial direc 50 ring and support member is prevented by the
engagement of each blade with the sides l2€l` and
tion, the metal forming the brake ring may be
£22 defining the slot H8 in each boss H6 of the
cast upon the support member when the latter
support member.
is cool so that fusing of the ring and the support
It may be noted that in both embodiments of
member is prevented.
my invention the connection of the support mem
It will be apparent that the structural features
of this connection of the brake ring and support
ber and :brake ring blades forms a mechanical
expansion joint therebetween for accomplishing
member will permit the expansion of the brake
the novel results set forth in the objects of my
ring radially outward of the support member,
invention and which thereby prevents thermal
during the braking operation, by the slidable
engagement of the projections of the blades with 60 stresses in the rotor during the braking operation
which may crack the friction plates with attend
the faces 28 and 3d defining the notches in the
ant possible fracture of the blades or the support
bell-like member 6 and the similar engagement
member and consequent breakage of the rotor.
of the inboard and outboard sides of said mem
It is to be understood that I do not wish to be
ber E with the sides 26 and 38 defining the slots
34 in the blades. Circumferential movement of 65 limited by the exact embodiments of the device
shown which are merely by way of illustration and
the brake ring relative to the support member
is prevented by the engagement of the projections
not limitation as various and other forms of the
device will, of course, be apparent to those skilled
32 in the' slots 34 of the blades with the faces
in the art Without departing from the spirit of
28 and 3B in the notches in the member 6. Axial
the invention or the scope of the claims.
movement of the brake ring relative to the sup
portl member is also prevented by the engage
I claim:
1. In a combination brake rotor and vblower
ment of the inboard and outboard sides of the
structure, a rigid bell-like support member having
member `6 with the sides 36 and 38 defining the
wheel-connecting means at its inner perimeter,A a‘
slots 34 in the blades.>
' It may be noted from a consideration of Fig 75 brake ring cast about the outer perimeter of said
7
8
member and comprising a pair of annular friction
plates and a plurality of spaced radially. arranged
blades extending between said Plates and trans
versely of said member, each of said blades having
plates, and means connecting ¿said _blades andsaíd Y
member, said means comprising a slot in eäch of
l
said blades extending transversely therethrough
slidably receiving theV outer perimeter of said. "
Y a relatively thickened portion at its radially inner Ul member, and each of >saidbosses having an open
extremity projecting outwardly of said plates,
and means connecting the outer perimeter of said
member and said blade portions, said means com
prising a slot in each blade portion extending
transversely thereof and slidably receiving there
within the outer perimeter of said member, each of
said slots having a projection therein slidably re
ceived within a notch in the outer perimeter of
ing Vtherein slidably receiving spaced portions olf
the adjacent blade >at opposite sides of said slot',
to permit movement _of said element in a radially l
voutward direction of said member and to prevent
10 relative circumferential and ¿axial movement of
said member and element.
, ~
'
l
»5; In a combination brake rotor and blower
structure, a rigid bell-like support member having
wheel-connecting means at the inner perimeter
said member extending transversely through said
member, said means being formed yand arranged 15 thereof and a plurality of radially arranged bosses
extending outwardly at opposite sides ofthe outer
to permit radial expansion and contraction of said
brake ring relative to said support member and`
perimeter thereof, a rotor blower element com
to prevent ' relative axial and circumferential
prising a pair of friction plates and spaced radi
ally arranged blades integrally formed with said
plates and having-,the'radially inner extremities
thereof extending outwardly of said plates, and
movement of said ibrake ring and said support
member.
'
l
2. Ink a combination brake rotor and blower
structure, a rigid bell-like support member having
means connecting the radially inner extremities '
Wheel-connecting means at its inner perimeter, an
of said `blades and the outer perimeter of said
member, said means comprising a slot extending
integral brake ring cast about the outer perimeter
of said member and comprising a pair of annular
friction plates and a plurality of spaced radially
transversely through each of said blades and
slidably receiving t‘ne outer perimeter of said
member, and each of said bosses having an open
ing extending in the plane of the associated
blade for slidably receiving the same, whereby
30 radial expansion and contraction of said element
relative to said member is accommodated and
relative axial and circumferential movement of
and the radially inner extremities of said blades,
said member and element is prevented.
said means comprising a slot in each of said :blade
6. In a combination brake rotor and blower
extremities extending transversely thereof and
structure, a rigid bell-like support member having
slidably receiving therewithin the outer perimeter
at its smaller diameter end wheel-connecting
of said member, each of said slots having -a pro
means and at its large diameterY end ai serrate
jection therein slidably received within a notch
perimeter, a rotor blower element cast-0n said `
in the outer perimeter of said member extending
support memben said element comprising a pair l
transversely through said member, said means»
being formed and arranged to permit radial ex 40 of annular friction plates «and spaced radially
disposed blades integrally formed with said plates
pansion and contraction of said brake ring rela
and extending therebetween, and means connect
tive to said support member and to prevent rela- ,
ing said blades at their radially inner extremities
tive axial and circumferential movement of said _
toI said serrate perimeter, said means comprising
brake ring in said support member.
a'slot in each blade extending transversely there
3. In a vcombination brake rotor and blower
of and slidably receiving the opposite sides of
structure, an annular rigid support member hav
said member therebetween, and projections in
ing a hub lfor `concentric connection to a support
said slots slidably received within the openings
Ving wheel, a brake ring cast aboutt'ne outer per
in said serrate perimeter, said .means being
imeter of said member and comprising a pair of
spaced annular friction plates and a plurality of 50 formed and arranged to permit radial expansion Y
arranged blades extending .between said plates
and extending transversely of said member, each
of said blades having its radially inner extremity
projecting outwardly of said plates, and means
connecting the outer perimeter of said member
spaced radially arranged blades extending be
tween said plates and transversely of said mem
andvcontraction of said element relative to said
support member and to prevent relative axial
ber, and means connecting said blades to the outer
perimeter of said member, said means. comprising
and circumferential movement of said element
and said member.
a slot in each of said blades extending transversely
'.7. In a combination brake rotor and blower`
thereof and slidably receivingY therewi-thin the
` structure, a rigid annular support member having
v outer 'perimeter of said member; ¿each of said slots
wheel-connecting means-at its inner perimeter,
having a projection therein slidably received with
a rotor blower element cast on the outer perimeter
ofsaid support member, said element compris
extending transverselythrough said member, said 60 ing a pair of annularÍfriction `plates and spaced
in a notch in the outer perimeter of said member
means being formed and arranged to permit ra
radially disposed blades integrally formed with
dial expansion and contraction of said brake ri-ng
relative to said support member and to prevent
said plates and extending therebetween, veach
of said blades extending transversely of said
relative axial and circumferential movement of
member, and means connecting said blades and
said brake ring and said support member_ Y
65 the outer perimeter of said member, said means
4. In a combination brake rotor and blowerY
structure, a rigid'bell-like support member having
' wheel-connecting means rat, the inner perimeter
comprising a slot in each blade extending trans
versely therethrough and slidably receiving the
outer perimeter of said member and interengag
thereof and a plurality’of spaced radially disposed
ing means on said blade comprising a protuber
bosses arranged on the outer perimeter of said 70 ance within the said slot and slidably engaging
a complementary notch in the outer perimeter
member and extending outwardly on opposite
of said member, whereby said element'is rela
sides of said member, an annular rotor lblower
tively slidable radially of said member, said con.-`
element surrounding said member and comprising
necting means permitting radialexpansion >and
a pair of spaced friction plates and spaced radially`
arranged blades' integrally ,formed With ,Seid-5
contraction of said element relative to said mem
2,412,432
9
10
ber and preventing relative axial and circum
ferential movement of said element and said
member.
of said member, whereby movement of said ele
ment relative to said member _in a radially out
ward direction is accommodated and relative
8. In a combination brake rotor and blower
structure, a rigid bell-like support member having
wheel-connecting means at the inner perimeter
thereof and a plurality of radially arranged
bosses extending outwardly at opposite sides of
the outer perimeter thereof, a rotor blower ele
ment comprising a pair of friction plates and
spaced radially arranged blades integrally formed
with said plates, and means connecting said
blades and said support member, said means -com
prising a slot in each blade slidably receiving
the outer perimeter of said member, and an
opening in each of the associated bosses ex
tending in the plane of said blade for slidably
engaging opposite sides of said blade whereby
radial expansion and contraction of said element
relative to» said member is accommodated and
relative circumferential and axial movement of
said member and element is prevented,
'
axial and circumferential movement of said ele- v
ment and said member is prevented.
12. In a combination brake roter and blower
structure, a rigid bell-like support member hav
ing wheel-connecting means at its inner perim
eter, a rotor blower element cast on the outer
perimeter of said member, said element compris
ing a pair of annular friction plates and spaced
radially disposed blades integrally formed with
said plates and extending transversely of Vsaid
member, and tongue and groove means connect- v
ing the radially inner extremity of each blade
and the outer perimeter of the support member,
said means being formed and arranged to permit
expansion and contraction of said element ra
dially of said member and to prevent relative
20 circumferential movement of said element and
member, and means on said blades engaging the
inboard and outboard sides of said element to
prevent relative axial movement of said element
structure, a rigid annular support member having
and member.
a hub arranged for concentric connection toy a
13. In a combination brake rotor and blower
supporting rotating member, a rotor blower ele
structure, a rigid annular support member hav
ment cast on the outer perimeter of said mem
ing a hub arranged for concentric connection to
ber, said element comprising a pair of friction
a supporting rotating member, a rotor blower ele
plates and spaced radially arranged blades ex
ment cast on the outer perimeter of said mem
tending therebetween and integrally formed 30 ber, said element comprising a pair of friction
therewith, and means connecting said blades and
plates and spaced radially arranged blades ex
said member, said means comprising a slot in
tending therebetween and integrally formed
each Áblade extending transversely therethrough
therewith, each of said blades extending trans
and slidably receiving said support member, ’and
versely of said member and having a slot in
means disposed on opposite sides of said member
the plane of said member for slidably receiving
and at opposite sides of each blade and having
the same, and said member having means on op
9. In a combination brake rotor and blower
slidable engagement therewith in the plane of
said blade, said connecting means permitting
movement of said element radially outward of
said member and preventing relative circum
ferential and axial movement of said member and
element.
10. In a combination brake rotor and blower
structure, a rigid annular support member hav
ing a hub arranged for concentric connection to
a supporting rotating member, a rotor blower
posite sides thereof extending along the adjacent
sides of each blade for slidably engaging the
same, to permit expansion and contraction of
said element radially of said member and to
prevent relative axial and circumferential move
ment of said member and element.
14. In a combination brake rotor and blower
structure, a rigid annular support member, a rotor
blower element cast on the outer perimeter of
said member, said element comprising spaced
element cast on the outer perimeter of said mem
friction plates and blades extending therebe
ber, said element comprising a pair of friction
tween and secured thereto, each of said blades
plates and spaced radially arranged blades ex
extending transversely of said member and 4hav
tending therebetween and integrally formed 50 ing means slidably engaging the opposite sides
therewith, and means connecting said blades and
of said member and the outer perimeter of said
said member, said means comprising slots extend
member and interlocked with said sides and
ing through the radially inner extremities of said
perimeter, whereby radial expansion and con
blades transversely thereof and slidably receiving
traction of said element relative to said support
opposite sides of said member, and means dis
member is accommodated and relative axial and
posed on opposite sides of said member and slid
circumferential movement of said element and
ably engaging opposite sides of each blade, said
member is prevented.
"
connecting means permitting movement of said
15. In a combination brake rotor and blower
element radially outward of said member and
structure, a rigid annular support member, a
preventing relative circumferential and axial 60 rotor blower element surrounding said member
movement of said member and element.
and comprising a plurality of spaced annular
11. In a combination brake rotor and blower
friction plates and spaced radially arranged
structure, a rigid bell-like support member hav
blade members extending between said plates,
ing wheel-connecting means at its inner perim
and interengaging means on each blade member
eter, a rotor blower element cast on the outer
and the outer perimeter of said support member,
perimeter of said member, said element compris
said means comprising slots extending transverse
ing a pair of annular friction plates and spaced
ly through each of said members and slidably
radially disposed blades integrally formed with
engaging opposite sides of the other of said mem
said plates and extending transversely of said
member, and a plurality of aligned slots in said 70 bers to permit expansion and contraction of said
element radially of said member and to prevent
blades radially disposed about the outer perim
relative axial and circumferential movement of
eter of said member and receiving the same for
said member and element.
slidably interconnecting said blades and mem
CARL E. TACK.
bers, and means in each of said slots slidably
engaging spaced notches in the outer perimeter 75
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