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Патент USA US2107257

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Feb. 1, 1938.
. ‘c. BEUSCH
- Filed Sept. 19, 1935
Patented Feb. 1, 1938
, 2,101,257.
Christian Beusch, Wadenswil, Switzerland
Application September ,19, 1935, Serial No. 41,322
5 Claims.
(Cl. 188—152)
This invention relates to vehicle brakes of the
hydraulically actuated type and especially to im
provements in parts of the brake system dis
closed in my application Serial Number 33,906,
5 ?led July 30, 1935. In said prior application I
have disclosed vehicle braking methods and de
be the cause, such; variations of pressure must
be promptly corrected.
vices in which two liquid systems are involved.
The primary system is actuated by the operator
and serves 'to apply a braking force to one or both
10 brake shoes of one wheel only. The torque gen
erated by the braking effect of the one wheel is
utilized to operate the second liquid system to
apply the brakes on the other wheels and pos
sibly one of the brake shoes of the ?rst wheel.
15 ‘The braking effect of the two ?uid systems are
so correlated that while the ?rst wheel may be
locked, the braking force applied to the other
wheels is somewhat-less than that applied to the
?rst wheel whereby the other wheels can not be
20 locked. This is responsible for very favorable
results in many respects, only three of which need
' be here mentioned.
First, the force necessary
to be applied by the operator-is many times less
than would be necessary if all the wheels are
The problem of maintaining the secondary
system full of the braking liquid is somewhat
complicated by the fact that the master cylinder 5
or cylinders must be provided with two pistons
in order to provide for braking in both directions
The present invention has for an object to pro
vide a braking arrangement of the kind in_ ques
tion which will at all times be properly supplied 10
with ample‘ force transmission ?uid.
A further object of this invention is to pro
vide a master cylinder or cylinders of the sec
ondary liquid circuit of a braking system in
which the pistons will consistently returnjto their 15
fully released position whenever the braking force
applied thereto ceases.
A_ further object of this invention is to provide the master cylinder of the secondary liquid
circuit with‘ means for ensuring an adequate 20
supply of force transmission ?uid.
Another object of the present invention is-to
provide master cylinders for secondary circuits
in which the forward and backward braking
forces are applied in di?erent chambers.
‘A further object of this invention is to pro
25 braked directly. Second, since only one wheel.
may be locked skidding and swerving of the ve
vide simple and e?‘icient forms of master cylin
hicle is notrcaused to any extent. Third, since ders for vehicle\brak_ing systems and to provide
all but one of the wheels are always braking ‘means for ‘maintaining them amply supplied
with rolling friction instead of sliding friction with braking ?uid.
30 practically the maximum braking effect is ob
Further objects and advantages of the inven
tion -will be, apparent from the following de
As previously stated the braking torque of the tailed descriptipn and drawing of several em-v
?rst wheel is utilized to apply the brakes of the bodiments: representing the. invention.
other wheels. This is done by applying the said
In the ‘accompanying drawing, Fig. 1 is. a
.35 torque force, whether backward or forward, to diagrammatic representation of the type of brak
a liquid contained in a master chamber or cyl
ing system and apparatus to which the present
inder by means of one or the other of a pair
. v
of pistons according to whether the direction of invention
Fig. 2 is a side view partly in section of parts
the braking is backward or forward. This pres
of the brake applying mechanism of a lcontrol40 sure is transferred from the said master cylinder ling wheel in which one brake shoe is operated
throughout the entire secondary fluidv system and
ls,_utilized at each of the wheels to be braked
thereby for applying an equal braking force on
each of said wheels.
Fig. 3 is a side sectional view of one embodi
ment of a master cylinder.
Fig. '4 is a side sectional view of a second 46
embodiment of a master, cylinder chamber in
which the two pistons operate in different com
municating cylinders; and
will be realized that many factors. tends to cause
variation of the pressure in such systems for in
separate cylinders.
pheric pressure, wear of the moving parts and
55 possible slight leakage, etc. No matter What may
by the secondary liquid circuit.
Now, it is essential to a satisfactory practical
operation of ‘such braking arrangements that
both of the liquid circuits, primary andsecond~
ary, shall at all times be entirely full of the
braking liquid, but without excessive pressure. It
stance variations of temperature and atmos- .
Fig. 5 is a side sectional view of a third em-_
bodiment in which the two pistons operate in 50
In the vehicle braking system, to which the '
‘present invention relates, two liquid systems 1
and I‘! are provided. The primary‘ liquid system
‘I is directly under the control of the operator l5
who applies pressure to the liquid in system 1
by pressing on pedal- I, which pivots lever 2 to
push piston 3 to the right in cylinder 4. This
presses the liquid through the primary system
pistons into bearing engagement with the outer
ends of brake jaws l I. The features of the system
of Fig. 2 not shown in the drawing are similar
to those of the system of Fig. 1.
‘I into cylinder 9 where it presses pistons l6
apart and brake shoes II are forced into contact,
in the secondary systemsiof the above described
with an exterior brake drum of a wheel (not
shown). Cylinder 4 extends into a liquid con
tailner 5, and is provided with a port 6 through
10 which liquid may flow from or to the primary
system each time the piston moves to release
position, whereby undesired pressure variations
in said system are promptly corrected. The pri
In order to maintain the proper volume of liquid
braking arrangements, in accordance with the
present invention the secondary system master '
cylinder is provided with a-liquid supply reser
voir and special connections therewith. In Fig. 10
3 a master cylinder for a secondary system is
shown in section and is designated generally by
numeral 4|. The ends of this cylinder may be
' mary liquid system is therefore always main
15 tained full and free of undesired pressure re
turned inwardly as indicated at 42, 43 to provide
abutments for pistons or packing members. A 15
gardless of changes in conditions tending to vary liquid reservoir 44 is associated with cylinder 4|
its pressure.
and as shown may oe formed integrally there
The brake shoesior jaws II are pivoted at ' with if desired.‘ Within the cylinder 41 ‘are ar
points l2, l2 on a supporting frame I3 and are ranged a pair of pistonsor plungers 45, 46 nor?
resiliently drawn toward each’other by spring
mally spaced apart. ‘A compression spring 41
II_'. This frame is mounted on axle 6 and is yieldingly' biases the pistons apart. One of the
capable of free rocking movement about the axle pistons, for instance piston 45, is attached to a
in either direction. 'lhe cylinder 9 is also rod 50 which extends into one'end of the cylinder
mounted on this supportingqframe l3. It .will be and is adapted to receive aworking force on its
seen that when the brake shoes I l are moved into outer end from ‘an arm H of the frame l3,
braking engagement with the brake drum of. the similarly as the rods of pistons |5 of Figs. 1 and
moving wheel a torque will be applied thereto 2. The rod 50 is provided with a second piston
and this will be transmitted to frame I3 through 52vspaced from piston 45, whereby a chamber 53 ‘
pivots. l2 and cylinder 3, and frame |3 will there
is formed therebetween. Also a third piston or
fore tend to rotate-about the axle I in the direc
abutment 54 is formed or attached to rod 5|] at a
tion of the force applied thereto.
This tendency of frame II to rotate is used
. for applying the brakes of the other wheels of-
‘the vehicle and to this endframe I3 is provided
with a pair of .spaced extensions H the. inner
faces of which engage the ends of operating rods
'54, 56 of a pair of pistons or ‘plungers 45, 46 in
4|. Cylinder 4| is securely mounted on
a fixed part of the vehicle.
The cylinder 4| is the master cylinder of the.
secondary liquid system II, that is to say, pres
sure exerted on the liquid in cylinder I6 is applied
position spaced from piston 52, forming .there
- Piston 46 is attached or formed on the-end of
rod 56 which extends outwardly through the op
posite end of the cylinder 4| from the rod 56 and 35
is adapted to be engaged at its outerend and
operated by the other arm l4 of frame l3, (see
Figs. 1 and 2). This rod is provided with a
second piston or abutment 53‘ spaced'from piston
46 and forming therebetween a chamber 60.
When in non-operative position or when the
opposite piston is operative the abutment pistons
to brake operating cylinders 2| at each of the 54 and 58 engage the inwardly turned ?anges 42, .
other wheels to be braked. -Cylinder4| is con
43 respectively and limit the outward movement
nectedwith-each ofthe braking cylinders of the of their associatedarods 56 and 56 respectively.
other wheels by conduit system l1 and each of the ‘ The pistons and abutments 54, 52, 45, 46 and 56,
cylinders 2| applies or releases the associated which*are ‘slightly'smallerthan the cylinder to
pivoted brake shoes 23 in accordance with move
allow free sliding therein, are provided on their
ments of pistons 22 in said cylinders ‘in response inner face with sealing devices 62, 63, 64, 65 and
to the fluid pressure and as‘ in?uenced by tension 66 respectively for preventing undesired passage
springs |_|' connecting the various pairs of shoes. of ?uid outwardly toward the ends of the cylin- In the modi?ed construction shown in Fig. 2 der 4|.
vofthedrawlng,onlyonelu'akeshoe || is'directly
The space between the inner pistons 45 and 46
actuated by the primary liquid circuit. 'The is connected with the‘i'secondary' liquid system I‘!
shoe or thev controlling wheel is op
through a ‘port 68. When one or the other of
erated by the secondary‘ system. To obtain this the rods 50 or 56 is pushed'inwardly, theother
result the cylinder 3 of the ?rst described ar
is held against yielding by its abutment engag
rangement is substituted by a double cylinder 26 ing a ?ange at the ends of the cylinder and
?xed on the upper part of supporting frame I3. consequently a pressure .is generated in the
This cylinder is divided intermedially by a parti
chamber 16 between the inner pistons and trans 60
tion‘wall so that in effect, it is two cylinders. mitted to the secondary liquid system H.
One of the chambers so provided is connected “
Chamber "I0 is connected with chamber 53
‘with the primary liquid system through pipe ‘I, ‘through a conduit 1| formed in the wall of
and a plunger 23 in said cylinder actuates a
brakeshoe ||. The other chamber 23' of cylin
der 26 is'connected with the master cylinder l6
of the secondary liquid system through conduit
II’. The other brake shoe ll of the controlling
wheel is actuated by the pressure of the liquid of
70 the secondary system acting ‘on piston29' in
chamber 23". Shoes II are resiliently urged
to'ward'each other by interconnecting spring ||_'.
The chambers of cylinder 23 may'contain ‘com
springs 36, 3| interposed between the
partition wall and the pistons for urging the
cylinder 4|.
One end 12 of this conduit opens '
to chamber 10 closely adjacent piston 46 when in
its outer position, whereby a very slight inward
movement of -piston 46 seals this'end of the
conduit. The other end 12' of the conduit 1|
opens into chamber. 52. Chamber 53 also com
municates with reservoir “by an opening 15
which opens into chamber 53 close to piston 52
whereby a slight inward movement of piston 52
immediately closes opening 15. It is clear that if
either rod 56 or 56 moves inwardly communica
tion between reservoir 44 and chamber ‘III is im
3 .
2,107,257 ‘
a pair of pistons,one of said pistons being
mediately interrupted ‘while upon return to its having
located in said cylinder having a forward and a
outer position communication is immediately re
established. Therefore, each time the brakes are
rearward packing ring, and having a ?uid passage
‘released the secondary liquid system is equalized
between said rings, a reserve ?uid reservoir con
and corrected if necessary to the proper pres
sure and volume and will at all times be auto-_
said rearward-packing ring, and aconduit'con
nected with said ?uid passage closely adjacent
matically kept at the proper pressure. The
reservoir 44 may be ?lled from time to time
nectin'g the passage between said rings with a
point in the chamber closely adjacent and in
' front of the other piston, said other piston having
through opening 16 closed by stopper 11.
a ' packing ring, whereby the initial part of a 10
brake applying movement of either of said pistons
in Fig. 4 the principle of operation is quite similar
to that of Fig. 3. However the two pistons are
disposed in different cylinders 4|’, 4|" com
' municating with each other at their inner ends
seals the master chamber from the reservoir, and
communication between said chamber and reser
voir is established each time both pistons move to
release position.
but having their ‘axes angularly disposed with full
2. A master chamber for hydraulic brake sys
respect to each other. In thiscase a pairof > tems
for vehicle wheel brakes,'comprising a cylin
compression springs 41’ are provided and their
inner‘ ends, opposite the pistons, abut against der, oppositely facing pistons in said cylinder, said
cylinder and pistons de?ning a control space of
abutments 80, 8|. The two cylinders are in com
variable capacity, according .to the positions of 20
20 munication with each other, when the brakes
the pistons, means for positively limiting move
are released, by means of a conduit ‘H’ formed
in the-cylinder casing, and opening into cylinder ment of each of said pistons in said cylinder in
the directions which expand the control space,
4|’ at a point immediately in rear of its inner
most piston 45’, and into cylinder ll" at a point means connecting the hydraulic system with said 21',
control space, means for moving one or the other
25 immediately in front of its innermost piston.
The reservoir 44' may be formed separately from of said pistons in a direction/to reduce the capac
of said control space depending on the direc.- .
the cylinders and communicate therewith by ity
conduit 15' opening into cylinder 4| at a point tion of braking of the vehicle, and pressure
between pistons 45'- and 52’. End sealing and equalizing and adjusting means for said control
space a. id system comprising a braking ?uid
30 abutment engaging pistons 54' and 58’ are pro
reservoir, conduits connecting the reservoir with
vided in this embodiment also, and engage abut
the control space when both of said pistons are
ments 42' and 43'. This embodiment is other
wise similar to that of Fig. 3 and further descrip-" in the position of maximum expansion of°the
‘control space and means for interrupting communication between said reservoir and control
space when either of said pistons is in a position
a pair of separate cylinders and reversed pistons. reducing the capacity of said control space; .
3. A master vcylinder for hydraulic brakes for
The working chambers 10' and 10" of the cylin
ders483, 84 respectively are at the outer ends of ‘ vehicle wheels comprising a. cylinder, a rod ex
the cylinders and are in communication through tending into one end of said cylinder, and having 40
40. conduit 85. This conduit 85 is in connection with three spaced pistons each provided with a sealing
a secondary braking system 86 corresponding to ring engaging the inner wall of said cylinder, the
system I‘! of Fig. 1_ or H’ of Fig. 2. The inner spme between the inner and intermediate sealing
ends of the cylinders are provided with inwardly rings constituting a ?uid passage, a second rod
extending abutment ?anges ,42‘”, 43", against extending into said cylinder from the opposite 45
which abutment pistons 54", 58" respectively end from the ?rst rod, said second rod having
may engage. In this embodiment the rods 50', two pistons each provided with a sealing ring
56' extend toward each other into or substan - engaging the inner surface of the cylinder, means
tially into engagement with an arm 90 of a frame to limit the outward movement of said rods, a
9| pivotally attached to the axle of the vehicle ?uid supply and equalization reservoir, a conduit
and in?uenced by braking torque of a controlling connecting said reservoir with said cylinder at a ‘
.point adjacent the passage between the inner
wheel similarly as frame [3 of ‘Figs. 1 and 2. In
stead of apair of arms It as on frame l3, only and intermediate sealing rings of the first rod
a singlearm 90 need be provided on the frame 9|. and. closely adjacent the ‘intermediate ring, the
Chamber ‘l0’ communicates with chamber 53' wall of said cylinder having a passage extending
by means of a conduit 1 l” which opens into these from said mentioned passage to a point adjacent ‘
tion therefore‘appears unnecessary.
The embodiment shown in Fig. 5 is also similar
35 in principle to‘ that of Fig. 3, but is provided with
chambers at points corresponding to the quivalent
points in chambers 10 and 53 of Fig. 3 and'for
the inner side of the sealing ring'ofthe inner
piston of the other rod, means yleldingly pressing
the rods toward their outermost positions, and a
the same purpose. 'Chainber 53' also communi
cates with a reservoir 44" through port 15" when ' hydraulic system connected with said cylinder at 60
It will be apparent that the connections and "1
principles of operation of each of the above de
scribed embodiments are similar, and that in each
case the secondary liquid system is put into com
munication with the pressure and volume equaliz
ing reservoir each time the brakes are fully re
leased.- However, immediately upon operation of
a point intermediate the two inner pistons.
4. A master cylinder for hydraulic brakes for
vehicle wheels comprising a casing provided with
a pair of cylindrical openings angularly disposed
with respect to each other directed toward each
other. and communicating at their inner ends, a
rod extending into one of 'said openings, said
rod having three spaced pistons each provided
with a ?uid sealing ring engaging the inner wall , I
the mechanism in either direction the reservoir of the opening in which they are located, the
is tightly closed off from the system so that no ‘space between the inner and intermediate-seal
leakage thereto can occur. The system is thereby .ing rings constituting a?uid passage, a second
maintained in proper working order at all times. rod extending into the other cylindrical opening,
I claim:-
1. A master chamber for- vehicle wheel hy
draulic brake actuation comprising a cylinder.
said second rod having two pistons each provided
with a ‘sealing ring engaging the inner surface of
the opening in which they are located, the outer abuts to limit the outward movement of said rod,
‘ends of said openings extending inwardly, the ‘ the other end of said ?rst cylinder being closed,
outermost pistons on each of said rods engag
ing said inward extensions and limiting the out
ward movement of said rods, a ?uid supply and
equalization reservoir, a conduit connecting said
reservoir with the ?rst mentioned cylindrical
opening at a point adjacentv the passage between
the inner and intermediate sealing rings _of the
10' ?rst rod and closely-‘adjacent said intermediate
ring, said casing having a passage extending
from said ?rst mentioned passage to the second
a ‘second rod extending into the second cylinder
from the direction of the ?rst cylinder, said
second rod having two spaced pistons thereon
within the second cylinder, each 01 said pistons \
having a ?uid sealing ring engaging the inner
surface of said secondcylinder, the end of said
second cylinder entered- by said second rod hav
ing astop against which the outermost of said
two'pistons engages to limit the outward move
ment of said second rod, the other end‘ of, said
second cylinder being closed, a conduiticonnect
ing the opposite ends of said cylinders with each
other rod, means yieldingly pressing the rods to
other and with a hydraulic brakesystem, means
vward their outermost positions, and a hydraulic , for supplying Land equalizing ?uid in said system,
opening at a point closely adjacent the inner side
of the sealing ring of the inner piston of the
system connected with said casing at a. point in
termediate the two inner pistons.
5. In a. master hydraulic pressure chamber for
controlling vehicle wheel brakes, a pair of aligned
cylinders spaced‘ apart. one of said cylinders hav
ing a rod extending thereon from the direction
of the other cylinder, said rod having three spaced
“pistons disposed thereon each of which is pro
vided with a ?uid sealing ring, the space between
the inner and intermediate sealing rings con
stituting a ?uid passage, the end of said cylinder
toward the other cylinder having an inwardly ex
tending ?ange against which the outer' piston
said means comprising a reserve ?uid reservoir,
a conduit connecting said reservoir with the
chamber between the inner and intermediate
pistons of the ?rst cylinder at a point closely
adjacent the sealing ring- of the intermediate
pistonyand a‘ conduit connecting the said cham
ber with the second cylinder at a point in front
of and closely adjacent the sealing ring of the
inner piston thereof, and means disposed between 25
the adjacent ends of said rods for actuating one
or the other thereof according to the direction of‘
a braking e?‘ect.
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