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Патент USA US2117683

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May 17, 1938.
C.'SAUZEDDE
2,1 1 7,683 _.
HYDROSTATIC BRAKE
'Filed Oct. 50, 1936
3 Sheets-Sheet 1
INVENTOR
jC/aaa’e Sagea’de,
ATTORNEYS
May 17, 1938.
2,1 17,683
C. ‘SAUZEDDE
HYDROSTAVTIC BRAKE
Filed Oct. 30, 1956
3 $heets-Sheet 2
INVENTOR
C£214,042 aaagec/a/e,
'_EY
/'.
ATTORNEYS
May 17, 1938.
c. SAUZEDDE
2,1 17,683
HYDRQSTATIC BRAKE
Filed Oct. 50, 1936
3 Sheets-Sheet 3
V
/
v
.,1
V .
.4:
INVENTOR
C/guaéz Sag ec/a’e,
14
20
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ATTORNEYS
“
Patented May 17,1938
2,117,683
' UNITED STATES PATENT OFFICE
" 2,117,683
HYDROSTATIC BRAKE
Claude Sauzedde, Detroit, Mich, assignor to De
troit Hydrostatic :1 Brake ,Corporation, Detroit,
Mich, a corporation of Michigan
Application October 30, 1536, Serial No. 108,352
llclaims. (01. 188-152)
The present invention relates to hydrostatic
The numeral I designates an axle spindle hav
brakes for automotive vehicle and air craft use
and to means for sealing the ?uid pressure cham
ing anti-friction bearings 2 on the outer end
thereof supporting the outer section 3 of a com
' here in which reciprocating elements are mount
bined wheel hub and brake drum structure.
Se- '
cured with respect to the spindle I‘ is a'station
ary spider 4 having anti-friction bearings 5 there
5 ed to be moved in response to ?uid pressure for
forcing brake shoes into engagement wit? brake
drums.
on supporting the inner section 6 of the hub and
The primary object of the present invention is L brake drum structure. The two sections 3 and
I
to provide a hydrostatic brake having an ele
applying the brake shoes against the drum with
sealing means between the movable element and
6 are bolted together at their peripheries as in
dicated at l and they are provided, with inter-. 10
nal obliquely disposed braking surfaces 8 and '9
respectively. The spider 4 is provided with di
its stationary support for preventing leakage of
ametrically‘opposed radially extending projec
10 ment movable in response to fluid pressure for
?uid from the pressure chamber.
The sealing
tions l0, circular in section and having annular
shoulders l6. Each projection further has a pilot 16
formed of elastic material such as rubber and it portion l2v upon which is slidably received an an
has its opposite ends surface bonded to the ele
nular part 13 of an element l4 which is herein
ment which moves in response to ?uid pressure ’ after referred to as the movable element. The
and to a pilot therefor on a stationaryspider bottom of the annular formation I3 is provided
supporting the movable element.
with an end wall or shoulder l5 and an elastic
Another object of the present invention is to seal H has its opposite ‘ends vulcanized respec
provide a hydrostatic brake having brake shoes tively to the serrated shoulder l6 and the end
movable radially to engage braking surfaces on wall or. shoulder I 5. The projecting portion “1'
a brake drum and a stationary spider for sup
has an annular bead l?a which functions to
porting the shoes and for. guiding their radial crowd the rubber of the sleeve ll into“ engage 25
movement, the spider having a ?uid pressure unit ment with the inner wall of the annular for
mounted adjacent each shoe guide which when mation l3.
'
~
,
Extending through the spider 4 is a ?uid pas
moved outwardly in response to ?uid pressure
sage l‘la having a ?tting I1“ externally disposed
engages the respective shoe to force it into en
gagement with the drum. Each pressure unit for connection to the ?uid conveying lines of 30
comprises a‘movable element and a pilot forma
the hydrostatic brake system. Extending from
tion on the spider having inter?tting portions the passage I 1a are passages it which extend
through the radial projections 10 and open into
providing a ?uid pressure chamber, and an elas
tic sleeve having one end vulcanized tothe pilot the‘ annular formations l3 so that upon the in
troduction of ?uid under pressure through these
portion and its other end vulcanized to the mov
able element. The elastic sleeve thus serves to passages the movable elements [4 are caused to
permanently secure the movable element upon move outwardly radially with respect to the spid
the spider and to seal the pressure chamber to er. Adjacent each movable element 14 the spider
prevent leakage of ?uid therefrom. with the re ‘is provided with guide arms l9 between which
sult that the entire ?uid pressure unit isjper
are received the cross members 20 each of which
manently assembled upon thespider, independ
unite two brake shoes 2| having obliquely dis 40
ently of the shoes.
posed annular faces adapted for engagement with
With the above and other ends in view the the brake drum surfaces 8 and 9. Two sets of
invention is more fully disclosed with reference shoes are thus provided and the two sets are
connected at their ends by springs 22 which func in
to the accompanying drawings, in which
‘ tion to draw them inwardly radially of the spid
‘Figure 1 is a vertical section;
er. The springs 22 maintain the cross members
Fig. 2 is a horizontal‘ section' taken substan
tially on the line 2-2 of Fig. 3;
' _
20 in contact with their respective movable ele
Fig. 3 is a section taken on the‘ line 3—'3 of ments l4 so that when the latter are moved'outf
Fig. 1;
wardly by ?uid pressure as above mentioned they 0
Fig. 4 is an enlarged section of a detail, and force the shoes 2| into engagement with the
Fig. 5 is a section illustrating a different stage drums. When the?uid pressure is‘ relieved the
in the operation of the ?uid pressure means.
springs 22 retract the brake shoes and force the
Like characters of reference are employed movable elements l4' inwardly until the bottom
means is in the form of an open ended cylinder
20
25
30
40
45
50
55
throughout to designate corresponding parts.
‘walls of the annular formations l3 contact the
56
2
2,117,688
outer ends of their respective projections Hi.
In assembling the present brake the elastic
sleeves ll, of partially cured rubber, are placed
over the projections Ill and the annular forma
tions l3 are then slipped over the pilot portions
being supported by said cylindrical body for
lengthwise stretching‘without radial expansion.
I! so as to compress the sleeves ll substantially
as illustrated in Fig. 4. The external surface
gagement with a brake drum, a cylindrical body
of the projection in and the inner surface of
4. A ?uid pressure motor for use in a brake
assembly comprising a stationary spider adapted
to support ‘a brake shoe for movement into en
closed at one end, said spider having. a formation
thereon slidably supporting said cylindrical body
and cooperating therewith to form a pressure
the annular formation l3 are coated *with a ma
10 terial, such as liquid glass, which will prevent . chamber within said body, said cylindrical body 10
the rubber sleeve H from becoming surface being adapted to move outwardly, of said spider
bonded 'thereto during vulcanization thereof to engage said shoe to force it into engagement
with said drum upon the introduction of ?uid
while the shoulder l6 and the end wall or shoul
der ii are both treated to provide for vulcan . under pressure into said chamber, and means for
sealing said pressure chamber, said sealing means
15 ization of the rubber thereto. The movable ele
comprising a sleeve of elastic material having its
ment and the spider are then subjected to su?l
cient heat to cause vulcanization of the rubber opposite ends vulcanized respectively to said cylin
to the desired extent with the result that the drical body and said spider formation supporting
rubber of the sleeve becomes surface bonded to the same, said sleeve being con?ned against radial
'
the serrated shoulder l6 and the end wall or‘ expansion by said cylindrical body. .
5. A ?uid pressure motor for use in a brake as
shoulder l5. As shown, movement of the mov
able element ‘l5 outwardly in response to ?uid sembly comprising a stationary spider adapted to
pressure may take place by stretching the rubber support a brake shoe for movement into engage
of the sleeve as shown in Fig. 5.
ment with a brake drum, a cylindrical body closed
Although a specific embodiment of the inven
at one end, said spider having a formation there
25
tion has been illustrated and described it will on slidably supporting said cylindrical body and
be understood that various changes may be made cooperating therewith to form a pressure cham
within the scope of the appended claims with
ber within said'body, said cylindrical body being
out departing from the spirit of the invention adapted to move outwardly of said spider to en
gage said shoe to force it into engagement with
30 and such changes are contemplated. '
What I claim is:
said drum upon the introduction of ?uid under
l. A ?uid pressure motor for use in a brake as
sembly having a brake drum, brake shoes adapted
to contact said drum, a stationary spider sup
35 porting said shoes for movement radially into en
gagement with said drum, said motor comprising
a ?uid pressure chamber integral with said spider,
15
20
25
30
pressure into said pressure chamber, and means
for sealing said pressure chamber, said sealing
means comprising a‘ rubber sleeve having its op
posite ends surface bonded to said cylindrical 35
body and said spider formation respectively, said
sleeve being con?ned against radial expansion by
a movable element associated with said chamber, a . said cylindrical body.
»
seal formed of elastic material supported against
6. A ?uid pressure motor f r brake assemblies
radial expansion by the wall of said chamber and having a stationary spider, a brake drum rotata
40
having one end surface bonded to a transverse -bly mounted with respect to ‘said spider, and
wall of said chamber and its opposite end surface brake shoes adapted to engage said drum, said
bonded to said movable element, said movable motor compressing guide means on said spider
element being adapted to engage means on said supporting said shoes for movement into engage
shoes whereby movement of the latter moves
45 said shoes radially into contact with said drum. ment with said drum, a movable element mounted 45
' adjacent each guide means and adapted to en
"2. A ?uid pressure motor for use in a brake as
gage the shoe supported thereby to move the same
sembly having a brake drum, and brake‘ shoes,
comprising a stationary spider, guide means on
into engagement with said drum, said movable
element having an annular formation providing
said spider adapted to support said shoes for
movement radially of said drum, said spider hav
ing ?uid pressure means adjacent each guide
means and comprising'a pair of relatively movable
elements having inter?tting portions forming a
’ ?uid pressure chamber, and a sleeve of elastic
material having its opposite ends surface bonded
to respective relatively movable elements and seal
ing said pressure chamber, said sleeve being sup
ported against radial expansion by one- of said
a ?uid pressure chamber, means on said spider
for guiding movement of .said movable element,
a rubber seal connected by vulcanization to said
movable element and to said spider for sealing
said pressure chamber, and means for conveying
?uid under pressure to said pressure chamber.
7. A ?uid pressure motor for brake assemblies
having a brake, drum rotatably mounted and
brake shoes adapted to engage said drum, com
prising a stationary spider having integral guide
inter?tting portions.
means adapted to support said shoes for move 60
ment into engagement with said drum, a movable
assembly comprising a stationary spider adapted element mounted adjacent each guide means and
to support a brake shoe for movement into en-, adapted to engage the shoe supported thereby to
gagement with a brake drum, a cylindrical body move the same into engagement with said drum,
65 closed at one end, said spider having a formation said movable element having an annular forma 65
thereon slidably supporting said cylindrical body tion providing a‘?uid pressure chamber, means‘
3; A ?uid pressure motor for use in a brake
and-cooperating therewith to form a pressure
chamber within said body, said cylindrical body
being adapted to move outwardly of said spider to
70 engage said shoe to force it into engagement with
said drum upon the introduction of ?uid under
pressure into said pressure chamber, and means
for sealing said pressure chamber, said means
comprising an elastic body vulcanized to said
cylindrical body and spider, said elastic body
on said spider for guiding movement of said
movable elements, a sleeve of elastic material per
manently connected to said movable element and
to said spider for sealing said pressure chamber, 70
said sleeve being con?ned against radial expan
sion by said annular formation, and means ex
tending through said spider for conveying ?uid
under pressure to said pressure chamber.
8. A ?uid pressure motor'for brake assemblies 75
3
2,117,683
having a brake drum rotatably mounted (and
brake shoes adapted to engage said drum, com
prising a stationary spider having integral guide
means on said spider supporting said shoes for
movement into engagement with said drum, a
movable element mounted adjacent each guide
' means and adapted to engage the shoe supported
thereby to move the same into engagement with
said drum, said movable element having an an
10 nular ‘formation providing a ?uid pressure cham
ber, means on said spider for guiding movement
of said movable elements, said spider having a
formation extending axially into said annular
formation and adapted to engage the bottom
15
thereof to restrict movement thereof inwardly,
an-elastic seal for said pressure chamber, said
seal having its opposite end permanently secured
to movable element and spider respectively and
con?ned against radial expansion by said annular
20 formation, and means for conveying ?uid under
pressure to said pressure chamber. '
' 9. A ?uid pressure motor for brake assemblies
having a brake drum rotatably mounted and
brake shoes adapted to engage said drum, com
prising a stationary spider having integral guide
means on said spider supporting said shoes for
movement into engagement with said drum, a
movable element mounted adjacent each guide
means and adapted to engage the shoe supported
30 thereby to move the same into engagement with
said drum, said movable element having an an
nular formation providing a ?uid pressure cham
ber, means on said spider for guiding movement
35
of said movable element, said spider having a
formation extending axially into said annular
formation and adapted to engage the bottom
thereof to restrict movement thereof inwardly
and of a smaller diameter than said annular
formation whereby to provide a shoulder, an
10. A ?uid pressure motor for brake assemblies
having a brake drum rotatably mounted and
brake shoes adapted to engage the drum, com
prising a stationary spider having guide means
adapted to support said shoes for movement
radially with~respect to the drum, a movable
element adjacent each guide means adapted to
engage said shoes to move the same radially into
engagement with said drum, each movable ele
ment having an annular formation providing a 10,
?uid pressure chamber, said spider having a
radial projection engaged by said annular forma
tion whereby it closes the open end of said annular
formation and supports said movable element for
movement radially, said radial projection hav 15
ing a reduced portion extending into said annular
formation and adapted to engage the bottom
thereof, an elastic seal for said pressure cham
ber disposed within and supported by said annu
lar formation, and means for conveying ?uid 20
under pressure to said pressure chamber.
,
11. A ?uid pressure motor for brake assemblies
having a brake drum rotatably mounted and
brake shoes adapted to engage the drum, com
prising a stationary spider having guide means 25
adapted to support said shoes for movement
radially with respect thereto, a- movable element
adjacent each guide means adapted to engage
said shoes to move the same radially into en
gagement with said drum, each movable element 30
having an annular formation providing a ?uid
pressure chamber, said spider having a radial
projection engaged by said annular formation
whereby it closes the open end of said annular
formation and supports said movable element 35
for movement radially, said radial projection
having a shoulder, an elastic sleeve having one
end surface bonded to said shoulder and its other
end surface bonded to the bottom of said an
elastic sleeve within said annular formation and nular formation, and means for conveying ?uid 40
having its opposite ends surface bonded to said . under pressure to said pressure chamber:
shoulder and the bottom of said annual forma- ‘
tion respectively, and means for conveying ?uid
under pressure to said pressure chamber.
CLAUDE SAUZEDDE.
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