close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2114991

код для вставки
April 26, 1938.
2,114,991
H. C. BOWEN
PRESSURE PRODUCING DEVICE FOR FLUID PRESSURE SYSTEMS
Filed Nov. 30, 1935
96
'
9o
24
a2
80
,6
Z2
/8
v
94
64
.
50
30
96
|
62
74
v
‘
-
32
z
'1)
:a
92 7".|
66
56
72
76
88
as
I
20
68 70 54
53
26
I4
INVENTOR.
' ATTORNEYS.
‘2,114,991
Patented Apr. 26, 1938
UNITED STATES PATENT OFFICE
2,114,991
, PRESSURE
PRODUCING DEVICE FOR FLUID
PRESSURE SYSTEMS
‘Herbert 0. Bowen, Detroit, Mich., assignor to
Hydraulic Brake Company, Detroit, Mich., a
I corporation of California
Application November 30, 1935, Serial No.‘ 52,391
4 Claims. (Cl. 60-545)
This invention relates to brakes, and more
particularly to ?uid pressure brakes for motor
vehicles.
~
-
_
'
Broadly the invention comprehends a ?uid
6 brake system for motor vehicles including a
manually operated ?uid pressure producing
means connected by ?uid pressure delivery pipes
or conduits to ?uid pressure actuated motors for
the actuation of brakes associated with the wheels
10 of a vehicle, and means interposed between the
?uid pressure producing means and the ?uid pres-_
sure actuated motors operative to maintain a pre
determined .pressure on the motors.
An object of the invention is to provide a ?uid
15 pressure brake system having means for main
taining a predetermined pressure on a part of
the system.
~
Another object of the'invention is to provide a
?uid pressure brake system including a ?uid pres
20 sure producing device connected by ?uid pres
sure delivery pipes to ?uid pressure actuated
motors, and means associated. with the device for
maintaining a predetermined pressure on the ?uid,
pressure delivery pipes and motors.
Other objects and structural details of the in
ends are corresponding friction elements or shoes
44 and 46 for cooperation with the drum. A
?uid pressure actuated motor corresponding to
the motors 38 is mounted on the backing plate
between the separable ends of the shoes and is
operative to spread the shoes‘ into engagement
with the drum against the resistance of a retrac
tile spring 48 connected between the shoes.
The discharge port 28 is controlled by a two
way valve. As shown, the inner face of the cylin 10
der head is counter-bored as indicated at 50.
This bore forms in conjunction with the sleeve
“at the base thereof an annular shoulder 52.
A thimble 54, open at one end and closed at the
other end, has at its open end a circumferential 15
?ange 56 and a plurality of openings 58 in its wall.
The ?ange 56 is ?tted snugly in the counter
bore 50, and the shoulder is suitably deformed to
secure the thimble against displacement. The
closed end of the thimble provides a'seat for an 20
inverted collapsible sealing cup Bll having a co
axial opening 62, and bearing against the cup is
a disk 64 having an axial opening 66 registering
with the opening 62 in the cup and a ?ange 68
including two cylindrical sections of di?erent 25
25 vention will appear from the subjoined description diameters, that section having the smaller diame-.
ter ?ts the cylinder with a substantial clearance
taken in connection with the drawing forming a and is provided with a plurality of openings 10 so
part of this speci?cation, and in which,-—
' as to afford free passage of ?uid, and that section
Fig. 1 is a schematic view of a hydraulic brake i‘ having the larger diameter is fitted snugly in the
30
system embodying the invention, and
cylinder so as to guide the disk during its move
30
Fig. 2 is a vertical sectional view of the ?uid
pressure producing device.
v ’_
A piston reciprocable in the cylinder I2 is re
Referring to the drawing 'for more speci?c tained against displacement by a washer ‘l4
details of the invention, l0 represents a reservoir seated on an annular shoulder 16 in the open end
having a ?lling opening which may be closed by of the cylinder. and is secured in place by a split 35
a plug I! provided with suitable means, not shown, ring 18 seated in a circumferential groove in the
for venting the reservoir to the atmosphere; and wall of the cylinder. The pistonghas a reduced
ment.
a cylinder l4 formed at the bottom of the reser- .
voir has spaced ports I6 and I8 providing com
munications between the cylinder and the
40
reservoir.
4
The cylinder has a detachable head 20. As
shown, the head has a rim 22, preferably pro
vided with polygonal faces for the reception of a
wrench, and a concentric sleeve 24 which may be
-
V
portion providing in conjunction with the wall of
the cylinder an annular chamber 80 communi 40
eating with the reservoir III as by way of the ports
IS. The skirt of the piston carries a leak-proof
cup 82 providing against seepage of ?uid from the
cylinder past the piston, and the head of the pis
ton has a plurality of ports 84 providing com 45
munications between the annular chamber 80 and
threaded into the cylinder with a suitable gasket‘ that portion of, the cylinder forward of the pis
26 interposed between the cylinder and the rim. ton. A collapsible sealing cup 86 on the head
The head is also provided with a discharge port of the piston controls the port 84, and when the
28 connected as by a suitable ?tting 30 to a ?uid piston is in fully retracted position the rim of
pressure delivery pipe 32 having branches 34 the cup uncovers the port, I 8 to establish com
and 35 each connected to one pair of ?uid pres
munication between that portion of the cylinder
sure actuated motors 38. One pair of the motors forward of the piston and the reservoir. The cup
38 is arranged for the actuation of the brakes is‘ held against displacement by a spring 88 in
associated with the front wheels of a vehicle and terposed between the cup and the disk 68 abutting
the other pair is arranged for the actuation of the inverted sealing cup 68. This spring also .
the brakes associated with the rear wheels of the serves to return the piston to its retracted posi
vehicle.
tion and to impose a load on the two-way'valve
Each brake includes a ?xed support or backing
plate 40 associated with a rotatable drum 42, and
60 pivoted on the backing plate by their articulate
controlling the port 28.
_
,
The piston 12 has in its back a recess 88' for
2
2,114,991
the reception of one end of a thrust pin' 92, the
- other end of which is suitably secured to a fitting
94 connected as by a ?exibleboot-JG to the open
end of the cylinder for the exclusion of ‘dust and
other foreign substances from the cylinder, and
the principles involved are susceptible of numere
ous other applications that will readilyv occur to
persons skilled in the art. The invention is,
therefore, to be limited only as indicated by the
scope of the appended claims.
I
the ?tting 94 is connected by a rod 88 to a foot '
Having thus described the various features of
pedal'lever I08 pivoted on a suitable support I82
the
invention, what I claim as new and desire to
and connected by a retractile spring I 04 to a secure
by Letters Patent is:-—»
‘
10
?xed support.
In operation, assuming that the system is ?lled
with suitable ?uid and that the piston "I2 is in
fully retracted position, the-two-way valve con
1; A ?uid pressure producing device including
a cylinder, a piston reciprocable therein, a head
for the cylinder having an opening providing
'10
a discharge port for the cylinder, a sleeve on
trolling the discharge port 28 maintains a prede
termined pressureon the ?uid delivery pipes 32, ‘ the head threaded into the cylinder, and a two- ,
15 34 and 36 and the ?uid pressure actuated motors way valve comprising a stationary valve element
secured to the head within the sleeve, a perfo 15"
38, the magnitude of which is dependent upon the rated.
collapsible sealing cup on the stationary
tensile strength of the spring 88 acting on the
two-way valve.
'
Y
" When it is desired to' apply the brakes, the op
valve-element, a member seated on the cup, and a
spring. interposed between the member and the
head of the piston.
20 erator depresses the foot pedal lever I08 and this '
2. A?uid pressure producing device including
force is transmitted therefrom to the piston ‘I2 to a' cylinder,
a piston “reciprocable therein, a head
move the piston on its compression stroke. Dur
ing the initial movement of the piston on ‘ts com- '
_ for the cylinder having an opening providing a
discharge port for the cylinder, a sleeve on the
head extending into the cylinder, a thimble se
cured to the head within the sleeve having open
pression stroke ?uid is displaced from the cylin
ings in its wall, a collapsible sealing cup on the
der I4 past the two-way valve whose rim is de thimble
having an axial opening, said cup having
?ected by the passing ?uid, through the ?uid
pressure delivery pipes ‘32, 34 and 36, into the' a rim extending away from said piston, a member
seated on the cup, and a spring between the mem
30 ?uid pressure actuated motors 38, causing actu
ber and the head of the piston.
,
30
ation of the motors with the resultant spreading
3. A ?uid pressure producing device including
of the shoes 44 and 46 into engagement with the
drum 42 against the resistance of the retractile a cylinder, 9} piston reciprocable therein, a head
for'the cylinder having an’ opening providing a
spring 48.
discharge port for the cylinder,-a sleeve on the
7 Upon release of the foot pedal lever I00, the re
tractile spring I04 becomes eifective to return head extending into the cylinder, a thimble se 35
this lever to its normal or retracted position, and cured to the head within the sleeve having open
during this movement of the foot pedal lever the ings in its side wall, a collapsible sealing cup on
piston 12 is moved to its retracted position under» the thimble having an axial opening, said cup
the influence of'the spring 88 augmented by the having a rim extending away from said piston,
a- disk normally seated on the cup having an'
pressure on the ?uid returning from‘ the ?uid
40,
pressure actuated motors 38 under the in?uence opening registering with the opening in the cup,
a
double
diametral
?ange
on
the
disk,
the
smaller
of the retractile spring 84 connected between the
shoes 44 and 48 of the respective brake structures. section of the ?ange ?tting the cylinder with
substantialclearance and having openings there
45 In returning to the master cylinder, the ?uid
passes through openings 58 in thimble 54, then in, the larger section of the ?ange ?tting snugly 45
pression stroke, the cup 86 closes the port I8, and
upon further movement of the piston on its com
in the cylinder, and a spring interposed between
moves cup 68 and disk 68 to the‘left so that a 'Y ' the
disk and the head of the piston.
space is formed between the base of the cupand
the closed end of- the thimble, and ?ows through
50 the space thus produced, and thence through
openings 62 and 66 into the'cylinder.
Because of the friction on the ?uid pressure
delivery pipes 32,_ 34 and 36 and the tensile‘
' strength of the spring 88, the piston 12 is re
turned to its retracted position slightly in ad
vance of the return of ?uid from the pressure ac
tuated motors 38 to the cylinder I4. This causes
a partial vacuum in the cylinder '44 resulting in
suction of ?uid from the reservoir I8, through
the port I6, the annular chamber 80 and the ports
4. A ?uid pressure producing device including
a reservoir, a cylinder supplied therefrom,'a pis
ton‘ reciprocable in the cylinder, a collapsible
sealing cup on the head of ‘the piston, a head on 60
the cylinder having an opening providing a dis
charge port for the cylinder, a sleeve on the head
threaded into the cylinder, the head having a
counter-bore, a thimble open at one end and 55
closed at the other end and provided with a plu
rality of openings in its wall, the open end of the
thimble secured in the counter-bore so as tosup- ‘
port the thimble concentrically of the sleeve, a
cup on the closed end'of the thimble hav-_
84 in the head of the piston, past the collapsible sealing
an axial opening, said cup having a rim ex
cup 88 into that portion of the cylinder forward ing
tending away from said piston, a disk on the cup
,of the piston to completely ?ll the cylinder I4. having
an opening registering with thevopening
Upon complete return of the piston to its re
in the cup, a double diametral ?ange on the disk,
65 tracted position any excess ?uid in the cylinder ' the
smaller ?ange ?tting the
I.4, due to the ?uid returned to the cylinder from stantial clearance and having cylinder with sub 65
openings therein,
, the ?uid pressure actuated motors 38, is dis-‘
charged from the cylinder throughthe port I8 the larger ?ange slidably engaging the wall of the
cylinder, and a spring interposed between the cup
into the reservoir.
'
_
on
the head of the piston and the disk.
, Although ‘this invention has been described in
.connection with certain speci?c embodiments,
HERBERT _C. BOWEN.
Документ
Категория
Без категории
Просмотров
0
Размер файла
390 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа