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Патент USA US2406328

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Aug- 27, 1945- -
Filed Sept. 27, 1943
Fv 19.1.
Ralph A? Guna’enson
W Wdw
Patented Aug. 27, 1946
2,400,323 ~
- 2,406,328
Ralph R. Gunderson, Chicago, 111.
Application September 27, 1943, Serial No. 503,975
4 Claims.
(01. 60-545)
cured thereto.
unit may be installed in connection with any
phragm and arranged centrally thereof is a suc
tion conduit I terminatingin an annular seat I‘.'
10 A valve member J normally engages this seat,'be
ing resiliently pressed thereag-ainst by’ a spring
-to provide for power operation thereof.
A further object is to obtain a construction
which can be conveniently located anywhere on
The casing section C’ has mounted thereon'ya
housing vG of smaller dimensions containing} a
?exible diaphragm H. Adjacent to this dia
a construction in which a single self contained
ordinaryhydraulic brake operating mechanism
together. The diaphragm F is also provided with
a peripheral ?ange F4 which extends between-the
?anges C2 of the casing sections C, C’and ‘is se-_
The invention relates to power brake mecha
nisms of that type in which the power applied
by the pressure of .the brake pedal is augmented
by a booster motor. More particularly the con
struction is of the type in which the booster
motor is actuated by suction from the engine
which is controlled by the operation of the pedal.
One of the objects of the invention is to obtain
J’. An annular ?ange J-2 on the member J forms
a seat for an annular ?tting H’ on the diaphragm
7H, said ?tting being normally retracted from said
15 seat by the pressure of a spring H2 so as‘to leave
the vehicle.
Another object of the invention is to obtain a
construction in which increase in booster power
an open annular port H3 between the ‘same and
is dependent upon proportional increase in pedal
pressure thereby rendering the system more deli
against a perforated diaphragm G’ in the hous
ing G and on the other side of this diaphragm is
arranged‘ ?ltering or aircleaning material K, re
tained by a cap member K’. An opening K2 in
the member ' J.
cately responsive to the operator’s control.
Still further it is an object to obtain a simple
construction having a minimum number of parts
this cap provides access for air which passes
and dispensing with the necessity for employing
brackets and levers in its installation.
It is also an object to provide a restricted by
pass for the direct passage of ?uid from the
master cylinder to the wheel cylinders whereby
the brakes may be initially operated without the
through the ?ltering material into the housing
G and casing C, C’ maintaining atmospheric
assistance of the booster motor and any air in
rounds a rod M and engages a shoulder M’ there
on. The rod M extends through the casing C, C’
With these and other objects in view the in
vention consists in the construction as herein
after set forth.
Fig. 1 is a central longitudinal section through
my improved unit;
Fig. 2 is a diagram illustrating its installation
in connection with an ordinary hydraulic brake
Fig. 3 is a cross section on line 3——3, Fig. 1,
As illustrated, A is a cylinder provided at one
end with a closure cap B and at its opposite end
pressure in the latter.
The tubular piston rod E forms a cylinder for
a small piston L slidable therein and having a
cup-shaped seal L’. A tubular shank L2 for this'
piston contains the helical spring L3 which sur
g the system may be eliminated.
In the drawing:
The springs J " and H? abut
and has at its outer end abifurcated portion'M2
which embraces the suction conduit Land is
secured'by screws M3 to the annular ?tting H’.
The arrangement is such that an outward move
ment of the piston L will through’ the spring'L3
and rod M communicate its motion to the dia
phragm H and press the annular ?tting _H,’
against the ?ange J2 of the member J to close
the annular port H3. A further movement in the
same direction will disengage the member J from
the seat I’ so. as to open communication between
with a head A’ on which latter is mounted a cas
the suction conduit I and the interior of the
ing secured by bolts A2. This casing is preferably
housing G and casing C’.
formed of two sections 0 and C' centrally con
The unit as just described may be mounted in
nectedto each other by periipheral ?anges C2.
any convenient location on the vehicle and is
Within the cylinder A is a piston D having a cup
shaped packing D' and which is mounted on a
connected into the hydraulic brake system there
tubular rod E extending through the head A’
A conduit N leading froma master cylinder N’
of any suitable, construction connects with .the
into the casing C.
F is a cup-shaped ?exible "
of as follows:
diaphragm connected to the rod E by a stop plate
cylinder A at the left end thereof as shown in
F’ on one vside thereof and a pressure plate F2
on the opposite side. A nut F3 engaging a
Figure ,1. A conduit 0 connected to the right»
hand end of the cylinder leads to the wheel cyl
threaded end portion of the rod E forms the
‘means for clamping these plates and diaphragm
inders diagrammatically illustrated at P, P’, P,
1 P3, Figure 2. The suction conduit I is connected
E2 is arranged around the rod outside of the
to the inlet mamiold Q of the engine or other
source of suction. R is the brake pedal for op
erating a master cylinder N’.
When the unit is ?rst installed the cylinder A
By reason of the restricted by-pass grooves A3 '
inder N’. ' By-pass grooves A3 in the cylinder A
the initial operation bringing the braking sur
faces in contact is effected by ?uid passing direct
ly from the master cylinder to the wheel cylin
ders and without the assistance of the booster
extend on opposite sides of the piston D in its
V and its connections are ?lled with hydraulic ?uid
by the operation of the pedal R and. master cyl
Also as these grooves
are in the upper '
normal, position so as to permit the passage of 10 portion of the piston the entrapping of air be
hind the same isavoided. " '
?uid therethrough vand also the escape of air.
The air in vthe cylinder A and the conduit ‘0 will
~ As previously statedpthe construction of the
also bepermittcd to escape through the usual, ,
bleed connectionsthat are :provided for each of
unit is very simple and its installation only re
quires connection to the conduits N, O and I.
the wheel cylinders.
WhatI claim as my invention'is:
After the system is com- 7
pletely ?lled with ?uid the operation is as fol
Pressure on the brake pedal R will force ?uid
from the master cylinder N’ into the cylinder A
to the left of the piston D. The ?uid will ‘also .~
pass through the tubular rod E and displace the 1
piston L therein, thereby compressing the spring
L3 and moving the rodM, this through its ‘bi-fur
'1. In a hydraulic brake system, a power unit
comprising a main cylinder adapted to be con
nected at one end to a pedal-actuated master
cylinder and at its opposite end to a wheel cylin
der, a power piston dividing said main cylinder
into a master cylinder side and a wheel cylinder
side, a booster motor mounted on one end of the
main cylinder, said booster motor having a mov
,cated connection M2 will move the ‘diaphragm
ablewall therein, a tubular piston rod connect
I-I'until the annular ?tting H’ bears against the
ing said power-piston with said-movable wall,
annular ?ange J 2 and closes the air inlet port H3.
said tubular piston rod forming a movable cylin
der communicating with the master cylinder side
of said power piston, a valve for controlling ,said
booster motor, and a small piston within said
The member J is then'moved awayvfrom the seat
ill’; which, by establishing communication be
tween the suction conduit I and the interior of
movable cylinder operatively connected ‘to said
‘the casing C’, will lower the pressure in the
latter." This will permit atmospheric pressure on 30 valve, said small piston being actuated by ?uid
pressure on the master-cylinder side of the power
the outside'of the cup-shaped diaphragm F, hav
piston and the eifective :area of themaster cylin
ing access thereto through ports C3 in the casing
der side of said ‘power piston being reduced by
C‘, to move said diaphragm to the right carrying
with it the tubular rod E and piston D. The ?uid .
the area of said sma-llpiston in all positions. '
thus displaced by the piston D [passes through 35 2. In a hydraulic brake system, a power unit
the conduit '0 to the several brake cylinders.
comprising a main cylinder adapted to :be com I
nected at one end to a .pedalzactuated mastercyl-' When the pressure within the casing C’ andcom
municating’housin'g G is lowered, atmospheric
inder and at its opposite end to a wheel cylinder,
pressure on the right-hand side of the diaphragm
an enlarged casing mounted on one end of said
H will ‘urge the diaphragm and rod M to the left, 40 main cylinder, a ?exible diaphragm .forming a
compressing the spring L3 and shutting o?‘ the
suction at I’, so that increased pedal pressure‘ is
required to reopen‘ the :suction :line at I’. Thus,
. :the total e?ectfis‘ to produce a reaction against
the brake pedal which requires the operator to
increase pressure thereagainst in proportion to
the effect of atmospheric pressure ‘on the dia
phragm H.
Furthermore, when the piston D
portionof a Wall of a chamber within said-cas
ing, a power piston dividing said main cylinder
into a master cylinder side and a'wheel cylinder
side, a tubular piston rod connecting said power
piston with said ?exible diaphragm, said tubular
piston rod .‘forming a movable cylinder communi
cating with the master cylinder side'of .said power
piston, valve means for relatively connecting said
chamber with a source of suctionor with .an’ 'at
moves to the right within the cylinder A, it en 50 mospheric
pressure, ‘and .a small piston ‘within
.larges the chamber to the‘ left so that more ?uid
said movable cylinder for :actuating said vvalve
.must be supplied .from ‘the master cylinder to
means, said wsmall piston being actuated ,by'z'?uid
.?ll- this space.
pressure on the master cylinder side of “thetpower
If movement of the pedal is stopped, atmos
piston and the effective area of the master icy-lin
pheric pressure on the diaphragm I-I will com
press the spring L3 .and shut off the suction line,
and if ‘the piston D is moving to the right under
55 der side ‘of saidpower piston being reduced v‘by
the area of said small piston in all positions."
3. In a hydraulic ‘brake system, a power unit
the in?uence of, the booster, pressure will be
comprising a cylinder adapted to "be connected at
reduced on the small piston L and will further
one end to a pedal actuated master cylinder and
60 at its opposite end to a 'wheel cylinder, an :en
facilitate the closing movement of the valve. ‘ ‘
Whenever pressure on the brake pedalis re
larged casing mounted on said v?rst mentioned
lieved, the combined force ofatmospheric pres
cylinder, a ?exible diaphragm forming a portion
sure on the diaphragm ‘H and tension of the
of a wall of a chamber within said casing, 1a ‘pis
spring L3 will move the piston L and rod 'M to
65 ton within said ?rst'mentioned cylinder, a tubular
the left, ?rst permitting the valve J to ‘engage the
rod on which said piston is mounted comm-uni
seat I’ to cut on the suction and then opening
cating with the master cylinder end of ~theilrs't >
the annular port H3 to‘ restore the pressure ‘with
mentioned cylinder andconnected‘to said ?exible
in the casing to atmospheric pressure. A- spring
diaphragm, a small piston slidable within said tu
F5 within the casing C’ abutting thereagainst at 70 bular rod, a small area diaphragm forming :a por
one end and at its opposite end against the pres
tion of the opposite wall .of said chamber, valve
sure plate F2, restores the diaphragm .F to its
normal position. The sliding joint between the
rod E and head A’ .is sealed by a cup-shaped
means controlling the alternative ,connection‘of
said chamber with a source of suction and with
the external atmosphere, said valve means being
,_ packing E" in the cylinder A, while alfeltpacking 75 normally held in position to close said suction
connection and open the atmospheric connection,
through which communication is established be
tween said chamber and the external atmosphere,
and a rod actuated by said small piston for mov
ing said valve means into its suction supplying
position and thereby actuating said ?rst men
a suction conduit extending into said chamber
having a valve seat surrounding an open end
tioned piston by said large ?exible diaphragm,
thereof arranged in alignment with the port in
such movement of the valve means being opposed
said ported member, a valve normally engaging
said seat extending through said port and pro
viding an external seat for said ported member
by said small area diaphragm in proportion to
the suction within said chamber.
4. In a hydraulic brake system, a power unit
normally spaced therefrom, resilient means for '
comprising a cylinder adapted to be connected at
yieldably holding said valve and said ported
one end to a pedal actuated master cylinder and
at its opposite end to a wheel cylinder, said ?rst»
- mentioned cylinder having an enlarged casing
mounted on one end thereof, a flexible diaphragm
forming a portion of the wall of a chamber with
member in normal positions, and a rod in the
in said casing, a piston within said ?rst mentioned
ter and connecting rod will actuate said ported
member to close said atmospheric connection and
cylinder, a tubular rod on which said piston is
path of said small piston connected with said
ported member whereby increased hydraulic pres
sure on the master cylinder side of said piston
will actuate said small piston and through the lat
open said suction conduit thereby actuating said '
mounted passing out from said cylinder and con
piston by said large ?exible diaphragm and op
nected to said ?exible diaphragm, a small piston
slidable within said tubular rod, a small area dia 20 posing movement of said valve by said small ?ex
ible diaphragm.
phragm forming a portion of the opposite wall of
said chamber and carrying a ported member
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