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Feb. 7, 1950
2,496,699
a. 5 CLARK
mm FOR uurrso coN'rAc'r msK BRAKES
Filed Aug. 29, 1946
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INVENTOR.
‘Bruce
Clark.
BY
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H7‘TZIUWAL5'XSv
Patented Feb. 7, 1950
H2,496,699
um'reo sures PATENT OFFICE
I
2,496,699
WIPER FOR LIMITED courao'r msx
BRAKES
Bruce E. Clark, Detroit, Mich, assignor to Chrys
ler Corporation, Highland Park, Mich., a cor
1
poration oi’ Delaware
Application August 29, 1946, Serial No. 693,641
10 Claims. (01. 188—72)
This invention relates to vehicle brakes and
more particularly to a means for maintaining the
friction surface of a disc brake clean and elim
The tapered hub I5
tapered rotatable axle l1 and secured thereto
inating road dirt and moisture from the disc
braking area.
the axle by the nut I8.
tatably supports axle
Limited contact disc brakes are known and com
monly provide a disc portion operatively secured
to the vehicle wheel or rotatable axle in combina
tion with a non-rotatable portion. The disc is
usually disposed in substantially parallel relation
ship to the wheel. The non-rotatable portion is 10 The brake to be described is composed of two
provided with means to force a friction element
portions. One of these portions is secured to and
rotates with the wheel
tion comprises a dished supporting member 2|
20
30
22 is disposed substantially
1 and rotates therewith through
I 6, hub l5, screws l4. and supporting
member 2 I. The second portion of the disc brake
is the stationary portion which is mounted upon
the axle housing I9 and comprises a brake hous
ing 24 which is
portions disposed adjacent both the outer and the
inner surfaces of the disc 22. The brake housing
24 supports a hydraulic braking means adapted to
contact the disc 22 and resist rotation of the lat
28 which has a cylinder 21 formed therein on an
axis parallel to the axle IT. The member 26 is
secured to the brake housing 24 by screws 28.
in alignment with the friction
element. In addition. I seal the movable member
itself from direct contact with the road dirt.
The device to be described herein is also illus
trated in my copending applications Serial Nos.
693,639 and 693,640.
In the drawings:
The cylinder 21 is connected to a suitable source
40
,
Fig. 1" is an elevation of a vehicle wheel viewing ‘
its internal surface and showing a disc brake as
sociated therewith;
Fig. 2 is a section taken on the line 2-2 of
Fig.1;
Fig. 8 is a section taken on the line H of
Fig. 2; and
Fig. 4 is a section taken on the line H oi’
2.
vehicle wheel "I comprises a disc portion
ii, a rim l2. and tire II. The wheel is secured
screw it to the hub II in the usual manner.
45
housing 24 adjacent the disc 22 immediately op
50 posite the pad 32.
It will thus be seen that the
entrance of ?uid through conduit 3|) will exert
a force on piston 3| moving it to the left as viewed
in Fig. 2 thereby squeezing the ring 22 between
2,400,090 i
this rotation reacts through pad 32 and through
the brake housing 24 to the stationary axle hous
ing I9.
4
first axis, a housing carried by said non-rotatable
element, a friction pad carried by said housing
parallel to said disc, means to force said pad into
frictional engagement with said disc to brake said
disc and said rotatable element. and a ring of ab
sorbent material surrounding said pad and sup
ported by said housing in sliding contact with said
disc to clean successive portions of said rotatable
disc as an incident to their presentation to said
'
A dust shield 34 is illustrated as secured to the
axle housing l9 by the screws 23 and extending
substantially parallel to the wheel Ill. The dust
shield is circular in form and has an opening 35
provided therein through which the brake hous—
pad for frictional engagement therewith.
ing 24 extends. The dust shield may be used to
prevent the entrance of some road dust into the
area between the shield and the wheel. The dust
shield may be omitted if a better circulation of
4. In a vehicle the combination of an element
rotatable about a first axis and a non-rotatable
element, a disc carried by said rotatable element
and having its axis coinciding with said ?rst axis,
a housing carried by said non—r0tatable element.
Oil for the axle housing 2H is sealed in the area.
a friction pad carried by said housing parallel to
adjacent the bearing 20 by the usual oil seal 33.
said disc,~ said pad having a relatively small area
I' have provided novel means to assure the pres
compared to said disc. means to move said pad
ence of clean disc surfaces in alignment with the
parallel to said axis to frictionally engage said
friction pads 32 and 33 at all times. I have provided
disc. a ring of‘ resilient material encircling said
a circular channel 31 in the brake housing 2t.
The channel 31 surrounds the pad 33. I have 20 pad and spring means urging said ring into con
stant wiping relationship with said disc, so that
provided a similar channel 33 in the member 26
successive portions of said disc are wiped clean
surrounding the pad 32. A circular non-metallic
by the disc rotation past said ring immediately
absorbent wiper 33 such as a. commercial plumbers’
prior to their alignment with said pad.
asbestos rope packing is provided in each of the
5. In a vehicle the combination of an element
channels 31 and 33. A spring washer 40 is pro 25
cooling air around the disc 22 is desired.
a
vided in the base of each channel so that the ad
sorbent wipers are resiliently urged into constant
contact with the rotatable disc 22. It will thus
be seen that no surface portion of the disc 22 can
rotatable about a first axis and a non-rotatable
element, a disc carried by said rotatable element
and having its axis coinciding with said ?rst axis
and so exposed to atmosphere as to be cooled
contact the friction pads 32 or 33 unless it has 30 thereby, a housing carried by said non-rotatable
element, a friction pad carried by said housing
first been subjected to the cleansing action of the
parallel to said disc, said pad having a relatively
wipers. By the use of these wipers the successive
small area compared to said disc, means to move
portions of the surface in contact with the pads
said pad parallel to said axis to frictlonlly en
are always substantially free of road dirt and the
gage said disc. a resilient element supported by
coeiiicient of friction between the pads 32 and 33
and the disc 221s substantially constant. In ad
dition the wipers cooperate with the disc 22 and
housing 24 to enclose the pads and prevent the
direct entrance of dirt to the pads 32 or 33. The
wipers may, if desired. be provided with other
shapes than the circular shape and could be pro
vided so that they only partially surround the
pads 32 and 33. It would be necessary to position
them “ahead of " the pads relative to the rotating
disc under these conditions.
I claim:
1. A combination comprising an element ro-v
said housing independently of said pad and posi
tioned in constant wiping relationship with saic‘
disc, said element being located adjacent said par
and having at least a portion thereof so disposer
that successive portions of said disc are wiper
clean by the disc rotation past said element im
mediately prior to their alignment with said pad
6. In a vehicle the combination of an element
rotatable about a first axis and a non-rotatable
element, a disc carried by said rotatable element
and having its axis coincidingwith said first axis,
a friction pad carried by said non-rotatable ele
ment parallel to said disc, said pad having a rela
axis and a non-rotatable ele
ment, a disc member carried by one of said ele 50 tively small area compared to said disc, means to
move said pad parallel to said axis to frictionally
ments in a plane normal to said axis, a friction
engage said disc. at wiper element, means con
member carried by the other of said elements and
stantly urging said element into wiping relation
adapted to contact a relatively small area on said
ship with said disc at a predetermined pressure,
disc, means to selectively engage and disengage
said element being located adjacent said pad and
said friction member with said disc to brake said
having a ?rst portion thereof so disposed that
rotatable element and a wiper encircling the area
successive portions of said disc are wiped clean
of contact of said friction member with said disc
by the disc rotation past said element immedi
to clean successive portions of said disc prior to
ately prior to their alignment with said pad and
their contact with said friction member.
2. In a vehicle the combination of an element 00 said element having a second portion protecting
said pad from foreign matter moved radially on
rotatable about a ?rst axis and a non-rotatable
element, a disc carried by said rotatable element
said disc by centrifugal force.
7. In a vehicle the combination of an element
and having its axis coinciding with said ?rst axis,
rotatable about a ?rst axis and a non-rotatable
a housing carried by said non-rotatable element,
element, a disc carried by said rotatable element
a friction pad carried by said housing parallel to
and having its axis coinciding with said ?rst axis,
said disc, means to force said pad into frictional
engagement with said disc to brake said disc and
a friction pad carried by said non-rotatable ele
ment parallel to said disc, said pad having a rela
said rotatable element, and a non-metallic ab
tively small area compared to said disc, means to
sorbed wiper encircling said pad and carried by
said housing in wiping relationship with said disc 70 move said pad parallel to said axis to frictionally
to clean the portion of said disc adjacent said pad.
engage said disc, an absorbent wiper element sup
3. In a vehicle with an unsprung portion the
combination with an unsprung portion of an ele
ment rotatable about a first axis and a non-ro
tatable element, a disc carried by said rotatable 75
element and having its axis coinciding with said
ported by said non-rotatable element, resilient
means to urge said element into wiping relation
ship with said disc, said element encircling said
pad so that successive portions of said disc are
8,490,009
6
wiped clean by the disc rotation past said element
immediately prior to their alignment with said
pad and so that foreign matter moving radially
or said disc is intercepted by said element prior
to the contacting oir said pad by said matter.
8. In a vehicle the combination of an element
rotatable about a ?rst axis and a non-rotatable
element. a disc carried by said rotatable element
said housing with a predetermined pressure to co.
operate with said disc and housing to enclose said
pad and substantially seal it from contact with
road dirt.
10. In a vehicle the combination of an ele
ment rotatable about a ?rst axis and a non-ro
tatable element, a disc carried by said rotatable
element and having its axis coinciding with said
and having its axis coinciding with said ?rst axis
?rst axis, a housing carried by said non-rotatable
and so exposed to atmosphere as to be cooled ii) element, a pair of aligned friction pads carried
by said housing parallel to and in close proximity
thereby. a housing carried by said non-rotatable
to said disc, one of said pads being disposed on
element, a friction pad carried by said housing
parallel to said disc, said pad having a relatively
each side of said disc. means to move one of said
pads into engagement with said disc under pres
small area compared to said disc, means to move
said pad parallel to said axis to i'rictionally en 15 sure, whereby said disc is forced into engagement
with said other pad and the friction of said pads
gage said disc, said housing having an annular
channel encircling said padI a ring 01' wiper ma
on said disc brakes said disc, and two rings of
terial retained in said channel, a spring positioned
absorbent material, each of said rings surround
ing one oi said pads and being supported by said
in said channel below said ring and operable to
urge said ring into constant contact with said 20 housing in sliding contact with said disc to clean
successive portions of said rotatable disc as an in
disc so that successive portions or said disc are
cident to their presentation to said pads for fric
wiped clean by the disc rotation past said ring
tional engagement therewith.
immediately prior to their alignment with said
pad.
BRUCE E. CLARK.
9. In a vehicle the combination of an element
REFERENCES CITED
rotatable about a ?rst axis and a non-rotatable
element, a disc carried by said rotatable element
The following references are of record in the
and having its axis coinciding with said ?rst axis,
tile 0! this patent:
a housing carried by said non-rotatable element.
UNITED STATES PATENTS
a friction pad carried by said housing parallel to 30
said disc, means to force said pad into frictional . Number
Name
Date
engagement with said disc to brake said disc and
said rotatable element, means surrounding said
pad and constantly ensuring both said disc and
2,851,041
Hawley __________ -_ June 13, 1944
3,873,572
Lambert _-_-__-__-... Apr. 10, 1945
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