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Патент USA US2407197

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Sept. 3, 1946.
2,401,197
R. wA-rTs
BRAKE ROTOR
l Filed Jan. 12, 1944
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INVENTOR.
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Patented Sept. 3, 1946
2,407,197
UNITED STATES PATENT OFFICE
2,407,197
BRAKE ROTOR
Raymond Watts, Chicago, Ill., assignor to Ameri
can Steel Foundries, Chicago, Ill., a corpora.
tion of New Jersey
Application January 12, 1944, Serial No. 517,942
3 Claims.
(Cl. 18S-264)
1
2
My invention relates to brake discs and more
dial friction faces I4 and IE respectively for coop
particularly to a brake rotor adapted for connec
eration with associated brake means. The fric
tion to an associated rotating member, such as
tion faces I4 and I6 are preferably in the form
the wheel of a railway car truck, for cooperation
of annular liners or wear plates secured to there
with associated braking means.
Cil spective plates 8 and Ill in any convenient man
The general object of my invention is to de
ner, such as bonding or welding; however, it will
sign a brake rotor incorporating cooling means
be understood that if desired these faces I4 and
for transmitting heat rapidly and uniformly from
I6 may be eliminated andthe friction surfaces
the friction rings of the rotor which comprise the
of the brake ring may be integrally formed on
braking surfaces thereof.
.
10i the friction plates 8 and I0.
A specific object of my invention is to design
Welded to the friction plates at their outer per
a novel fabricated brake rotor comprising an‘in
imeters is aclosure ring I8 deñning therewith
ternal chamber containing a cooling medium
and with the member 2 a chamber 20 (Figure 3),
having the characteristics of high thermal capac
which is substantially filled with a substance hav
ity and conductivity, such as, for example, metal 15 ing the characteristics of high thermal conduc
lic sodium, potassium nitrate, lithium nitrate, or
tivity and high thermal capacity such as, for ex
sodium nitrate.
`
ample, metallic sodium, or one of the other sub
My novel fabricated brake rotor comprises an
stances heretofore mentioned. It may be noted
iron or steel cylindrical support member having a
that the chamber 20 is not completely ñlled with
bore at one end thereof for the reception of the
the sodium, a small space being provided for ex
hub of an associated wheel, said support member
pansion of the latter which may be gasiñed by
having openings therethrough for the reception
heat developed in the friction plates 8 and I0
of means securing the rotor to the wheel. A pair
during a braking operation.
of spaced annular iron or steel friction plates
The inner surfaces of the friction plates are
are welded at their inner perimeters to the outer 25 provided with fins 22, 22 (Figure 3) which provide
perimeter of the support member and define
a relatively great area of contact between the
therewith a chamber for the reception of a cool
plates and the cooling substance within the cham
ing medium such as above described, said cham
ber 20, and likewise, the member 2 is provided
ber being closed at its radially outer extremity by
with a plurality of radial fins 24, 24 alfording re1
means of an iron or a steel closure ring recessed
atively great area of contact with the cooling
in the outer perimeters of the friction plates and
substance. It will be understood that although
welded thereto.
the fins 22, 22 are herein shown as annular mem
In the drawing, Figure 1 is a fragmentary side
bers extending axially of the brake ring, and the
elevation of my novel rotor, only one-half of the
iins 24, 24 are illustrated as annular members ex
same being illustrated inasmuch as it is a sym
metrical annular member.
Figure 2 is an edge elevation taken from the
right as seen in Figure l, and Figure 3 is a frag
mentary view in radial cross-section, taken in
the plane indicated by the line 3-3 of Figure 1.
My novel brake rotor comprises the annular
support or hub member 2 preferably formed of
35 tending radially of the brake ring, the form and
arrangement of these fins may be varied as de
sired.
.
Thus it will be seen that I have designed a novel
brake disc comprising an internal chamber with
in which is disposed a cooling substance or me
dium having high thermal conductivity and ca
pacity,
said substance being operable to conduct
iron or steel and having at one end thereof a
heat rapidly and uniformly from the friction sur
bore 4 for the reception of an associated rotat
ing element such as, for example, the hub of a 45 faces of the disc to the support member therefor,
wheel.
The member 2 is-provided with a plu
rality of openings 6, 6 therethrough for the re
ception of means securing the rotor to its :asso
` ciated rotating element.
Mounted on the outer perimeter of the sup
port member 2 is a brake ring comprising the
spaced annular friction plates 8 and l0 which
are preferably welded at their inner perimcters
at I2, I2 (Figure 3) to the member 2, said plates
havingr on their remote surfaces the annular ra
said substance also being operable to absorb a
considerable quantity of heat by virtue of its high
thermal capacity.
It is to be understood that I do not Wish to be
limited by the exact embodiment of the device
shown which is merely by way of illustration and
not limitation as various and other forms of the
device will, of course, be apparent to those skilled
in the art Without departing from the spirit of
55 the invention or the scope of the claims.
f , ‘i '
2,407,197
3
I claim:
1. In a fabricated brake rotor_ a cylindrical
support member h'aving radially and circumfer
entially extending heat dissipating ñns integral
4
thereof providing friction surfaces and the ad
jacent surfaces thereof formed to provide annu
lar heat dissipating fins circumscribing the axis
of said member and projecting axially thereof
into said chamber, a cylindrical closure ring
with the outer perimeter thereof and spaced from
Welded to the outer perimeters of said plates, and
the ends thereof, a, brake ring comprising spaced
a quantity of a substance having the charac
annular plates sleeved over said member and
teristics of high thermal capacity and conduc
having the inner perimeter thereof Welded to the
tivity Within said chamber substantially filling
outer perimeter of said member at opposite sides
of said fins, said plates defining an annular 10 the same.
3. In a fabricated brake rotor, a cylindrical
chamber therebetween, a cylindrical closure ring
support member having radially and circumfer
between said plates and recessed in the outer
perimeters thereof and welded thereto, friction
entially extending heat dissipating fins integral
plates secured to said annular plates on the re
with the outer perimeter thereof and spaced from
mote sides thereof, a plurality -of heat dissipat
the ends thereof, spaced annular plates sleeved
ing fins integral with the other sides of said an
over said member and receiving said fins therebe
nular plates and projecting axially therefrom at
opposite sides of said chamber into said chamber,
tween, said plates having the inner perimeters
thereof Welded to the outer perimeter of said
member and defining an annular chamber, fric
and a substance Within said chamber having the
characteristics of high thermal capacity and con 20 tion plates secured to said annular plates on their
remote surfaces, a plurality of annular heat dis
ductivity.
'
sipating fins on the adjacent faces of said annu
2. In a frabricated brake rotor, a cylindrical
lar plates, said fins circumscribing the axis of said
supportl member having at one end thereof a
rotor and being radially superposed and project
bore for connection to an associated rotating ele
ment and provided with radially and circumfer 25 ing axially with respect to said member into said
chamber, a cylindrical closure plate recessed in
entially extending heat dissipating fins integral
the outer perimeters of said annular plates and
with the outer perimeter thereof and spaced from
Welded thereto for closing the radially outer ex
opposite ends thereof, a brake ring comprising
tremity of said chamber, and a quantity of a
spaced annular plates sleeved over said member
and having the inner perimeters thereof Welded 30 substance having the characteristics of high
thermal capacity and conductivity Within said
chamber substantially filling the same.
posite sides of said fins, said plates defining an
to the outer circumference of said member at op
annular chamber and having the remote faces
RAYMOND WATTS.
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