close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Sept. 17, 194e.-
w. STE'LZE‘R
“
2,407,856
HYDRAULIC BRAKE MECHANISM
Filed June '5, 1944
,
f
‘
//
7;
A5
2 Sheets-Sheet 1
} _.
//
/0
22
Ft
'
‘
Q
-
>
'
2/
“q
|
55
‘ I
6/
'
64
‘ma
a?
V
9a
65
/06
/07
/6
W/u/A/n] ‘givggzz
ATTORNEY8
Sept. 17, 1946.
w. STELZER
2,407,856
HYDRAULIC BRAKE MECHANISMv
Filed June 5,’ 1944
2 Sheets-Sheet 2
INVENTG!
W/LuA/rl STE/.ZEK “
Patented Sept. 17, 1946
2,407,856
UNITED‘ STATES PATENT‘ OFFICE.
2,407,853
HYDRAULIC-BRAKEYMECHA‘N‘ISM
William Stelzer, East 0range,.N. Ji.
Application June 5, 1944,- SeriaITN'o; 538,844
1.
14 Claims.‘ (Cl. (SO-54.5)‘.
This invention relates to hydraulic brake mech—
anisms and particularly to a vehicle booster‘ brake
mechanism of the typev wherein the booster unit
is connected to the master cylinders and‘ to. the
wheel cylinders by 'hydrauliclines and wherein
displacement of ?uid from the master cylinder
2
booster unit, elements of thebraking system and
the intake: manifold of the motor vehicle engine
being. diagrammatically represented,
Figure 2'is1a section on line 2—-2 of Figure 1,
and.
.
Figure 3 is adetail perspectiveview of the valve
energizes the booster‘ motor and assists the lat
operating lever.
ter in applying the brakes.
Referring. to the; drawings the numeral Id des
An important object of the invention is‘ to
provide a power operated‘ brake‘ mechanism" of 10 ignates the. booster motor shown in the present
instance. as being of the ?uid pressure operated
the general character referred to wherein great
type andv comprising.v casing. sections‘ H and 12
er simplicity in the booster structure is obtained,
having peripheral ?anges I 3‘ between which is
thus substantially reducing the cost of manufac
arranged the peripheral. portion [4' of a ?exible
ture of the booster unit.
diaphragm Hi to be‘referred'to‘ later. The ?anges
A further object is to provide a booster brake 15 13'
are clamped in position by asplit band iii of
mechanism wherein the‘ usual separate motor
generally V-shaped section as shown at the bot
control cylinder and pressure cylinder in which
tom of‘ Figure. 1, the free ends of. the band car
pressure is generated. to apply the brakes are
rying, lugs H through which passes a clamping
combined into a single cylinder, thus reducing
bolt l8 (Figure 2)..
the overall length of the device and minimizing 20 The. casing. section
I0 is provided with a nip
the number of parts without sacri?cing any ef
ple 20 to one end of which is; connected a pipe
?ciency in operation.
A further object is to provide such a device
21, diagrammatically shown in Figure 1, and the
other end of this pipe is: tapped into the intake
wherein the housing shells for the ?uid pressure
manifold
of. the vehicle engine to provide a source
operated motor diaphragm are relieved of tension, 25
of pressure di?erential. The casing section [0
thuspermitting them to be. made of lighter ma
is similarly provided with a nipple 23 having its
terial.
inner end 24‘ connected to a substantially semi
A further object is to eliminate the usual check
circular rubber or other ?exible hose 2.5 for a
valve controlling communication between the
purpose to‘ be’ described. The outer end of the
control and pressure cylinders. and through
nipple. is: open to the atmosphere, preferably
which ?uid leakage from the pressure end of
through:
a suitable conventional air cleaner (not
the system is replenished, without sacri?cing the
shown). The motor [0 is provided with a pres
function of such check valve.
sure movable unit of‘ which: the diaphragm I5
A further object is to provide a booster motor
is one main part, the other main part being in
of the type referred to wherein the e?iciency of
the form of a cupped plate 28 against which the
the pressure packing cup and‘the life of such cup 35 radially inner portion‘ of the diaphragm i5 is
is very greatly increased by reducing differen
tial pressures a?ecting such cup as a result of
theme of a single cylinder as referred to above,
arranged. The inner periphery of the diaphragm
is secured in position with respect‘ to the plate
28 by a keeper 29- welded or otherwise secured
the packing cup being subjected at one side to
to the plate‘ 23. The plate is provided with a
maximum brake pressures and at the other side 40 cylindrical‘ offset 30 at one side of the center
to master cylinder pressures rather than to at
thereof and to thisoffset is connected‘ an elbow
mospheric or sub-atmospheric pressures.
3| communicating with the interior of the off
A further object is to‘provide such a booster
set 30 and having one end of a nipple 32 con
wherein the advantages referred to aresobtained 45 nected. thereto. The other end. of this nipple is
while still permitting the'use of simple poppet
connected to the other. end of the hose 25 as
valves to control the motor and through which
shown in’ Figures 1 and, 2'. Thus the; interior of
a perfect follow-up action of the parts is ob
the cylindrical offset “is in constant communi
tained.
cation with the. atmosphere.
Other objects and advantages of the invention 50 A generally cylindrical valve element 33', pref
will become apparent during the course of the
erably. formed of sheet metal, is adapted to con
following description.
trol communication between the opposite motor
In the drawings I have shown one embodi
chambersv 314. and 35. The valve 33 is provided
ment of the invention. In this showing
withan outstanding‘ annular ?ange 36 normally
‘ Figure 1 is an axial sectional view through the 55
urged into‘ engagement with a- rubber or simi
'
9,407,856
3
.
4
portion 68 has clearance with respect to the walls
0| and is engageable therewith to prevent rocking
lar seat 31 by means of a compression sprin
38. The rubber washer 3'! lies against the adja
cent face of the plate 28 and is held in position
by a ?at keeper plate ‘89 secured to the plate
of the lever 64 in its own plane about the axis
of the piston sleeve 6|. The plate 80 engages
the adjacent end of the piston sleeve 6| to limit
28 in any suitable manner, as by screws 00. It
movement of the latter toward the left as viewed
will be apparent that the ?ange 30 forms the
in Figure l. A spacer plate 84 (Figure 1) is ‘se
valve proper and is normally in engagement with
cured to the plate 80 and is engageable with the
the washer '3'! to disconnect the motor chamber
motor casing I2 to limit movement of the ?uid
35 from the air pipe 25.
.DiametricaHy opposite the valve 33 the plate 10 pressure responsive elements of the motor and
associated elements toward the left as viewed in
28 is apertured as at M and an apertured plate.
Figure 1. The tubular piston 19 projects through
45 is welded or otherwise secured to the plate 28
the plates 80 and 84 and is provided with a head
adjacent the aperture 4A to serve as a seat for
85 welded or otherwise secured thereto. This
j a spring 48 projecting into a cylindrical valve
head lies against the outer surface of the plate
element 41. This valve is provided with an out
- 84 and is welded thereto as at 88. It will be appar
‘ standing annular ?ange 48 normally engaging a
ent that the pressure responsive unit of the mo
50 overhanging the
keeper 48 having ?ngers
?ange '28 while affording communication around
the ?ange 58. A rubber seat 5| is secured against
tor, the plates 88 and 84, the piston sleeve 18 and
piston 18 are movable as a unit.
A boss 80 is welded as at 9 I' to the motor casing '
the plate 28 and has an axial opening coinciding 20 I2 axially thereof as shown in Figure 1. One end
with the aperture All for the flow of ?uid there
of a pilot pin 9| projects through the boss 90 and
through. V The washer 5| forms a seat for the.
V valve ?ange 48, but this ?ange isnormally urged
away from such seat by the spring 48, thus nor
mally affording communicationbe'tween the mo
tor chambers 34 and 35.
.
.
is preferably welded thereto as at 92.
The other
end of this pin projects into the‘ sleeve ‘i9 a sub
25 stantial distance to ‘act as a guide for the pressure
a
g .A cylinder indicated as a whole by the numeral
55 and preferably in the form of .a'casting is
movable units of the booster.
.
The power-operated piston 18 seats against the '
base of 'a packing cup 95 which extends outward
1 1y over the ?ange 58 and terminates in a'cylindri
provided intermediate its ends with an outstand
cal packing lip 95 slidable in the piston 55. The
ing annular ?ange 55 riveted or otherwise-secured
space to the right of the packing cup 95 as viewed
as at 51 to the motor casing II. Obviously, one
in Figure 1 forms a pressure chamber-91. This
end of the cylinder 55 projects into the motor cas
chamber communicates through a port 98 with
ing II as shown in Figure 1. A cup shaped piston
one end of a pipe 99, shown diagrammatically in ,
58 is mounted to slide in the cylinder 55 and has
Figure l, and leading to the vehicle brake cylin—
its right hand end as viewed in Figure 1 provided 35 ders I00. A spring I0| in the pressure chamber
with an annular ?ange 59 which slidably ?ts the
9'! urges the cup 95 and piston 18 toward the left
bore of the cylinder 55. The remainder of the pis
as viewed in Figure l. A relatively heavy spring
ton 58 is of reduced size to provide an annular
I02 urges the pressure responsive unit of the mo
passage 80 therearound. The piston 58 is carried
tor toward the left as viewed in Figure 1. It will
40
by one end of a piston sleeve 6| slidable in an
be apparent therefore that all of the parts of the
axial packing ring 62 carried by the plate 28.
apparatus tend to return to their normal posi
Near its left hand extremity as viewed in Figure
tions shown in Figure 1.
p
‘
l the piston sleeve 5| carries a snapring 63 to
The cylinder casting 55 is provided with a pas
retain in position on the sleeve ‘8| a lever 64 '1
which is apertured centrally thereof as at 55
(Figure 3) to receive the sleeve 6|. The lower end
500i the lever 64 is engageable with the conical
end of the valve element 41. The other end of
the lever 54 is o?‘set as at 61 to provide an endv
engageable with the conical end of the valve ele-'
ment 33. In the normal positions of the parts
shown in Figure l the lever ends 56 and 8'! light
1y engage their respective valve elements. The
lever 84 is widened intermediate its ends as at
68 for a purpose to be described.
The piston sleeve BI is slidable in a bushing
‘l5 arranged in the inner end of the cylinder 55
and retained in position by a snap ring ‘II.
Against this ring is arranged a felt or similar
,
sage I05 one end of which is connected to one end
of a diagrammatically illustrated pipe I06 leading
to a conventional master cylinder I01 the piston
of which (not shown) is operable by the usual
pedal I08. The other end of the passage I05
communicates with the passage 60 formed by the
reduced portion of the piston 58. The bore of the
cylinder. 91 is provided with a groove I09 which
starts from zero depth to the right of the ?ange
96 of the packing cup 95 and increases in depth
7 toward the left in Figure l to the passage I05 with
_ which it communicates.
The groove I09 merely
provides for the small leakage necessary for re
plenishing the leakage of ?uid from the pressure
end of the system. The slight‘ depth of the groove
I89 and the sloping of this groove upwardly to
washer ‘I2 held in position against-the bushing ‘I0 60 ward the right as stated above permits the pack
by a light compression spring 73, this spring
ing cup ?ange 96 to move toward the right to
seating against the plate 28 around the packing
build up pressure in the chamber S'I'without be- .
element 52. At the opposite side of the bushing
ing damaged by the groove I09.
7
30 is arranged a conventional lipped packing cup
The operation of the apparatus is as follows:
'14 and this cup and the piston 58 de?ne a control
The parts of the booster mechanism are nor
chamber 15 in one end portion of the cylinder 55.
mally position as shown in Figure 1. The pipe
A power piston 18 is slidable within the‘piston
I06 is connected to the master cylinder I01 and
58 as shown in Figure 1 and is mounted on the
is in constant communication with the control
end of a piston sleeve ‘I9. The piston sleeve 19
is adapted to be operated by the pressure respon 70 chamber ‘I5. The leakage groove I09 affords
?xed communication between‘ the passage I05
sive unit of the motorI0. A plate 80 is bent to
and the pressure chamber 91 when the parts are
form spaced side walls 8| (Figures 1 and 2) ter
in normal position. The valves 33 and’ 43' occupy.
minating at their ends in outwardly turned
the normal positions shown in Figure 1, the valve
?anges 82 secured by screws 83 or other fasten 75 33 closing communication between the chamber
ing’ elements to the plate 28. The widened lever
5
‘2,467,856
35 and theair pipe'2'5 while the valve 41 has its
flange lifted v‘from the resiilent seat 555 to con
nect the chambers 34 and ‘35. The ‘chamber 34
is in‘communicationwith ‘theiintake manifold 22
at all times, as will be apparent, and the pres
sure ‘responsive ‘unit of the ‘motor ‘accordingly is
normally ‘ “vacuum suspended.” It will Ybe'undelm
stood‘that vacuumoperation of the motor is pre
ferred, but that the connection ‘2'0’may ‘be'opened
to the atmosphere and the connection 23 "con
nected to a source ‘of super-atmospheric pressure
to utilize such pressure in‘the operation of the
motor.
'
6
merit lol the ‘pedal I68. ‘Assuming that the pedal
is moved a given distance "and .then stopped,
‘movement of the ‘center of the lever 54 will "be
"arrested. Slight additional movement of ‘the
pressure movable unit‘ of the "motor towardithe
right as .viewe'd‘in Figure '1 will result in the :seat
ing of the valve ?ange ":36 on the ‘seat ‘35 .t‘oJdis
connect the motor chamber 35 from ‘theair ‘pipe
25. "Thus movement of the pressure movable tunit
'will'be arrested. If @further brake applicationis
then desired, the brake pedal I103 will be further
depressed, resulting in‘a subsequent opening :of
the ‘valve 33 ‘to admit more vair into the chamber
When the "operator depresses "the brake pedal
35.
‘
'Ill8,-brake fluid will be displaced from ‘the vmas’ 1 5 When the brake is ‘released, fluid will ‘flow from
ter cylinder through ‘pipe I06 into the ‘control
the control chamber ‘I5 back into the master
chamber '15. The ‘fluid entering such chamber
cylinder IN. The valve 33, ‘which will iha‘velbeen
"will-move the piston‘58 toward the right as viewed
closed‘when movementof the brake ‘pedal clown
in Figure ‘1. This movement will ‘be relatively
wardl'y was arrested will remain closed, and the
slight prior to operation o‘f'the motor I0, as’will 20 lever ‘end 66 ‘will release the valve 431 to permit
become apparent, and this vmovement ‘is permit
the spring 46 ‘to unseat such valve :and again
ted -by the resiliency of the packing cup 35.
connect the motor-chambers 3e and
Air ‘will
Movement of the piston 1'58 transmits movement
thus l?ow from the chamber 35 to‘the chamber
to the center of the lever 64 through the ring 63.
'34 to reduce the ‘differential pressures ‘on opposite
The spring ‘38 is more strongly ‘tensioned than
sides ‘of the pressure movable ‘member, ‘The
the spring 46, and accordingly movement of the
springs PIQ‘I ‘and ‘I32 ‘will progressively return the
lever 64 will take place with the lever 'fulcrumed
parts ‘to normal position. Of course the brakes
at its point of contact with the valve 33, the
may “be partially released by permitting move
opposite-end of the lever moving to effect move
ment ‘of ‘the ‘brake pedal 108 only ‘partially ‘to its
ment of the valve-41 to engage its ?ange 48
against the seat .5 I, thus/closing ‘communication
betweenthe motor chambers 34 and 35. Very
slight movement is necessary to perform this
operation due to the limited necessary movement
of the valve 41 and due to the fact that the‘end
‘66 of the lever -64 moves approximately twicethe
distance of movement of the center ‘of the lever
64.
Movement of the ‘valve 41 will ‘be limited toit'he
point where the ?ange 48 engages the ‘seat ‘5|,
and slight additional movement of the lever 1564
‘will re?ect movement of the valve 33 to move it
from its seat 31, thusiadmitting ‘air through‘pipe
normal position.
in ‘such case the valves will
‘again ‘follow-upw-ith respect to movement of the
brake pedal Hi8, and as the pressure movable
member, in moving ‘to the left as viewed in Figure
‘1, ‘approaches a “position corresponding to :the
position of the ‘brake pedal, the lever end 66 will
"engage the valve i?ange A8 with the seat LEI to
prevent any further escape of air from the motor
‘chamber 375 into the chamber ‘34. Any tendency
"forthe pressure movable unit to move ‘beyond a
position corresponding to the position of the
‘brake "pedal, will cause the ‘lever end 61 to eii'ect
‘relative movement of the valve 33 to “crack” ‘this
‘valve to admit air into the motor chamber 35
‘and thus arrest further movement of the pres
25, nipple 32 ‘and elbow 3i .into‘the motor cham
ber 35. ‘Differential pressure-will ‘thus be estab 45 sure movable ‘member.
lished in the chambers of the ‘motor to effect
‘It will ‘be apparent that the present device
movement ‘of the pressureresponsive unit to the
eliminates one of ‘the two cylinders ‘now com
right as viewed in Figure -1. The tubularrpiston
monly employed in a device of this character.
rod 19 ‘having its left handend (Figure 1) ?xed
Ordinarilyan axial cylinder is carried byreach of
“with respect to the pressure movable unit ‘by
the motor casings I I and I2, one receiving ‘a
plates 84] and ‘84, movement of the pressure mov
valve-operating piston operable by fluid. displaced
able unit will e?ect power‘operation of‘the pis
‘from ‘the master cylinder, and the other ‘having
ton‘18.
therein a piston to build up ‘pressure ‘in a cham
Thus the piston 58 w'illbe moved ‘by foot-gen
‘ber corresponding to the pressure chamber 91.
erated pressure ‘in the master cylinder while the 55 Intthe ‘present construction only the cylinder 55
piston ‘I8 will be power-operated, both of these
is provided, this cylinder being only slightly long
pistons moving toward the ‘right to transmit sim
er‘than either of the two separate cylinders pre
ilar movement to vthe packing cup 95 and dis
viously employed. Obviously such arrangement
place ?uid .from the pressure chamber 9‘! into
reduces the weight of the booster unit; it reduces
the brake cylinders. Accordingly the operator
vthe amount of material used; ‘it reduces the cost
60
performs part of the work in applying the brakes,
of ‘manufacture by eliminating the necessity‘of
the other part being performed by the motor.
‘casting ‘and ?nishing two cylinders; and it re
The proportionate amount of work ‘performed by
duces the axial length of the ‘device, thus permit
the operator and by the motor will depend upon ‘ lting itsinstallation at points in motor vehicles in
the proportionate effective areas of‘ the pistons 65 which ‘the former type of ‘mechanism cannot be
58 and ‘I8. These elements obviously‘ may be
‘installed.
I
‘
readily ‘designed whereby the operator will per
"The valve. mechanism including the two valves
‘formany desired proportion of the work.
‘and‘ithe1lever16‘4 is not a part ‘of ‘the ‘present in
While poppet valves are employed, a perfect
vention. However, the present arrangement of
follow-up ‘action is provided. 'The operator may
‘parts makes‘it wholly practicable to utilize such a
fm'ove‘lthe'ibrakepedal I08 any desired distance to
valve mechanism with a booster motor of this
“e‘?ect thei'des'ired brake pressure, resistance to‘
type employing only a single cylinder having
movement of the brake being progressively built
both the control and pressure chambers therein,
‘up since increasing pressures in the chamber 91
this-‘being ‘possible for the coaxial arrangement
will react ‘through ‘the piston 58 ‘to “resist move 75 r‘o'f the piston sleeves _-GI and ‘19. The device is
2,407,856
.
7
highly accurate in response to movement of the
brake pedal I 08 and provides for a perfect follow
up action of the pressure responsive unit of the
motor with respect to the brake pedal. The op
erator performs any desired proportion of the
workin applying the brakes according to the de
sign of the pistons 58 and ‘I8.
motor casing. Accordingly the shells or casings
II and I2 may be made of lighter material. >
It is to be understood that the form'of the in
vention herewith shown and'described is to be
taken as a preferred exampleof the same and
that various changes in the shape, size andar
rangement of parts may be resorted to without
departing from the spirit of the invention or the
The leakage groove I09 provides for the re
scope of the subioined claims.
plenishing of any ?uid which may leak from the
I claim:
a
,
'
pressure end of the system during a brake appli 10
.1.‘ A brake operating mechanism for a hydrau
cation, this groove being open at its shallower end
lic brake system having a hydraulic brake cylin
to the pressure chamber 91 when the parts are in
der and a pedal-controlled master cylinder, com
normal position. It is pointed out that ports over
prising a ?uid cylinder one end of which com
which a packing cup operates are highly disad
vantageous' because of the tendency of the edge 15 municates with the brake cylinder and forms a
‘of such ports to cut the cup. The present ar
rangement, however, provides novel means for
affording limited communication for the flow of '
leakage ?uid into the pressure end of the sys
tem to replenish leakage. The groove I09 is
shallow and tapers to zero depth just to the right
of the ?ange 99 of the cup. _Initial movement of
the cup 95 displaces ?uid from the chamber 91
to take up slack between the brakes and brake
drums and this operation is accomplished without
building up appreciable pressure in the chamber
There is little tendency, therefore, for any
radial expansion of the adjacent portion of the
pressure chamber, a ?uid-displacing element
movable toward such end of said ?uid cylinder to
displace ?uid therefrom into the brake cylin
der, the other end of said ?uid cylinder being
closed and forming a‘control chamber communi
,cating,with the master'cylinder, a motor carry
ing said ?uid cylinder, a control mechanism for
said motor arrangedtherewithin, and means axi
ally movable by ?uid displacedinto saidcontrol
25 chamber from the master cylinder to operate said
controlrmechanism, said motor having a power
.movable unit connected to said ?uid displacing
element to effect movement thereof toward the
cup ?ange 95 into the groove I09, and What little
pressure chamber end of said ?uid cylinder upon
tendency is present occurs at a point where the
energization of said motor, said axially, mov-
groove I09 is of negligible depth and presents no
able means having a portion arranged to directly
enter said pressure chamber to boost-the hydrau
sharp edges to tend to cut the ?ange 96.
Particular attention is invited to the fact that
2. A brake operating mechanism for a hydrau
one of the principal practical difficulties which
has been encountered in devices of this character 35 lic brake system having a hydraulic brake cylin
lic pressure
has been the provision of a packing cup corre
sponding to the cup 95 which would withstand
therein.
-
_
p
_
;
,
V
l
der and a pedal-controlled master cylinder, _com
prising a ?uid cylinder. one end of which com
municates with the brake cylinder and forms a
pressure chamber, a ?uid-displacing element
pressures in the chamber 91 without leakage and
without relatively quickly wearing out. In ordi
nary devices'of this character, there is a'great 4.0 movable toward such end of said ?uid cylinder
to displace ?uid therefrom into the brake cylin
difference in the pressure in the brake pressure
chamber and in the adjacent chamber of the mo
tor, and this is particularly true where a vacuum
suspended motor is employed. It has been at
tempted to overcome this difficulty by addition
ally packing behind the pressure piston, but all
efforts along this line have failed to provide the
der, the other end of said ?uid cylinder being
closed and forming a control-chamber commu
nicating with the master cylinder, a motor carry
ing said ?uid cylinder, and having a power-mov
able unit, a control mechanism for‘ said motor
arranged therewithin, and a pair of elements rel
atively movable parallel to each other axially of
desired degree of perfection.
said motor, one of the elements of said'pair con
- With the present mechanism, the advantage of
a single cylinder containing both the control and 50 necting said ?uid displacing element to said pow
, er-movable unit and the other element of said pair
pressure chambers is utilized as described above
being connected to said control mechanism and
and provides a second highly important advan- being operable by ?uid displaced into said con
.tage in that it very greatly reduces differential
trol chamber from said master cylinder, said
pressures on opposite sides of the packing cup
other element of said pair having a portion
95. It will be apparent that as pressure pro
arranged to directly enter said pressure chamber
gressively increases in the chamber 91, corre
to boost the hydraulic pressure therein.
spondingly increasing pressures occur in‘ the
73. A brake operating mechanism for a hydrau
chamber 15. _While pressure in ‘the chamber 15
lic brake system having a hydraulic brake cyl
is always below the pressure in the chamber 91,
the difference in the two pressures is much less 60 inder and a pedal-controlled master cylinder,
comprising a ?uid cylinder one end .of which
than pressures occurring in prior devices between
communicates with the brake cylinder and forms
the high pressure chamber and the adjacent
a' pressure chamber, -a ?uid-displacing element
chamber of the ?uid pressure operated motor.
movable toward such end of said ?uid cylinder
One of the greatest obstacles encountered in a
to displace ?uid therefrom into the-brake cylin
device of this character is thus overcome and. the
der,'the- other end of said ?uid cylinder being
packing cup 95 will effectively seal the chamber
closed and forming a control chamber communi
91 and will last far longer than the packing cups
cating with-the master cylinder, a motor carry
of prior constructions. The life of the packing
ing said ?uid cylinder and having a power-mov
cup is also lengthened by the fact that the ?ange
96 operates always over a thoroughly wetted sur 70 able unit, a control mechanism having control
elements carried by said power movable unit
face, there being brake ?uid at all times in both
and a lever device for operating saidcontrol ele
of. the chambers ‘I5 and 91 as will be obvious.
Moreover, tensions to which the motor casings ~. ments, and a pair of elements relatively movable
parallel to each other axially of~said motor, one
vII and I2 are subjected are materially reduced
element'of saidpair connecting said power-mov
by the use-of a single cylinder 55 carried by one
,
2,407,856
10‘
able unit to said piston, the other element of
an annular ?ange portion surrounding the ?rst
named piston and movable therewith to displace
said pair having operative engagement with said
lever device and being operable by fluid dis-i
?uid from said pressure chamber, a piston rod
placed into said control chamber from the mas
ter cylinder, said other element of said pair hav
ing a portion, arranged to directly enter said
pressure chamber to boost the hydraulic pressure
movable unit, a control mechanism for said mo
der and a pedal-controlled master cylinder, com
prising‘ a ?uid cylinder one end of which com
tons, said pistons being movable relative to each '
closed and forming a control chamber communi
cating with the master cylinder, a motor carry
a pressure chamber, a ?uid-displacing clement
connecting the ?rst named piston to said power
tor, and a sleeve slidably surrounding said piston
rod and connected at one end to said second pis
therein.
‘~ ton, the other end of said sleeve being connected
4. A brake operating mechanism for a hydrau
to said‘ control mechanism to operate it in ac.
lic brake system having a hydraulic brake cylin 10 cordance with the relative positions of said pis
other.
municates with the brake cylinder and forms
'7. A brake operating mechanism for a hya, pressure chamber, a‘ ?uid-displacing element
draulic‘brake system having a hydraulic brake
movable toward such end of- said, ?uid cylinder 15 cylinder and a pedal-controlled master cylinder,
to displace ?uid therefrom into the brake cylcomprising a ?uid, cylinder one. end‘ of. which,
inder, the other end of said ?uid cylinder being
communicates with the brake cylinder and forms
movabletoward such end of said‘ ?uid cylinder
ing said-fluid cylinder and having a power-mov 20. to displace ‘fluid, therefrom into the brake. cyling
able. unit therein, a second piston movable in
der, the other end of said ?uid. Cylinder, being
said ?uid cylinder and de?ning one, end of said
control chamber, said second’ piston, having an
closed and forming a control chamber commu
nicating with the master cylinder, a motor car
annular‘ ?ange, portion surrounding the ?rst
rying said ?uid cylinder and having a power
named piston andmovable, therewith to displace 2:5. movable unit therein, a second piston movable
?uid from said‘ pressure chamber, means con
in said ?uid cylinder and de?ning one end of
necting‘ said power-movable, unit with said ?rst
named- piston, and means for controlling“ said
motor‘ by movement of said second piston‘ inci
dent to the displacement or ?uid- into said con 30
said control chamber, said second, piston hav
ing an annular ?ange portion surrounding the
?rst named piston andmovable therewith to dis
place ?uid from said pressure chamber, a pis
trol chamber from; the master- cylinder, said~secton rod connecting the ?rst named piston to
0nd piston being movablerelative to the ?rst
said power movable unit, a control mechanism,
namedpistom
a’
‘
l
‘
for said motor comprising a pair, of control
5;, A brake- operatingxmechanism for a hydrau-i
elements carried by said power movable unit and
lic brake‘ system having, a hydraulic brake cylin-1 } a lever device for operating said pair of, ele
der and a pedal-controlled:master cylinder, com
‘ ments, and a sleeve slidably surrounding said pis-f
prising a fluid cylinder one‘ end of which com
ton red, one, end of said sleeve being connected
municates with‘ the‘brake' cylinder and forms a;
to the second piston and the other end having
pressure chamber; a ?uid-displacing element
operative engagement withsaid lever device, to
movable toward such- end of said ?uid ‘cylinder _~
effect movement of said control elements upon
to displace ?uidtherefrom into the brakeicyli-ne
der, the other end oi} said- ?uid cylinder being
relative movement of said pistons, ‘said pistons
closed and forming; a control chamber com-mu
nicating- with the master cylinder; a motor car-i
rying said ?uid cylinder and having a power->
,8.,‘A,brake operating mechanism for a, hy
draulic‘brake system, having, a hydraulic brake
movableunit therein, a second piston movable
in said ?uid cylinder and de?ning one end of
said control‘ chamber, said second piston‘ hav
ing- an annular ‘flange portion surrounding the,
?rst named ‘piston and movable ‘therewith-to
displace ?uid from saidpressure- chamber, means
connecting-said power movable unit with said ?rst
named piston, a rod- proiecting from, the control
chamber end-of said ?uid cylinder and connected
tc‘said second piston, and a: control mechanism
operable by‘ said rod, saidilsecondlpiston, being
movable relative‘ to the ?rst piston, in, accordance
with variations in the- capacity of, said control
chamber to' operate said rod and control said
motor.
6.. A brake operating, mechanism
_
for a hy
draulic brake system having a hydraulic- brake
cylinder and a DEdaIv-COHtI’QHEd: master cylinder.
comprising a ?uid ‘cylinder, one end of which
being movable relative to each other.
, cylinder and a pedal-controlled master cylinder,
comprising a di?erential ?uid pressure operated
motor having a pressure movable unit therein
and having an , end member at one end thereof,
an axially. arranged ?uid ‘cylinder carried‘ by
said end member and having one end forming
a pressure‘ chamber communicating with the
brake cylinder, a ?uid-displacing piston con
nected tov said pressure movable unit and mov
able toward such end of the ?uid cylinder to
displace ?uid therefrom into the brake cylinder,
the other‘ end of said ?uid‘ cylinder being closed
and forming a ‘control chamber communicating
with, the master cylinder, a control valve, mech
anism‘ for said motor‘arranged therewithin, and
60 means axially movable by ?uid displaced into
said control chamberfrom the master cylinder
to operate said control valve mechanism to ener
gize said motor, said axially movable means hav
ing a portion arranged, to directly enter said
communicates-with‘ the‘bra-ke cylinder and forms ' , pressure chamber to, boost, the hydraulic pres
a pressure chamber, a ?uid-‘displacing element
sure therein.
movable toward such end- of“ said ?uid‘cylinder
to displace ?uid ‘therefrom into the brake cylin
der, the other end of; said fluid cylinder being
9. A brake operating, mechanism for a hydrau
lic brake system having a hydraulic brake cylin
_
der and a pedal-controlled master cylinder, com
closed and forming a control‘ chamber commu 70 prising a differential ?uid pressure operated mo
nicating with the master cylinder, a motor car
tor having a pressure movable unit therein‘ and
rying said ?uid cylinder and having a power
having an end member at one end thereof, an
movable unit therein, a second piston movable
axially arranged ?uid cylinder carried by, said
in said ?uid cylinder and de?ning one end of
end member and having one end forming a pres
said control chamber, said‘ second piston having 75 sure chamber communicating with the brake
2,407,856 '
12
11
cylinder, a ?uid-displacing piston movable to
ward such end of the ?uid cylinder to displace
, ?uid therefrom into the brake cylinder, the other
cylinder and a pedal-controlled master cylinder,
comprising a differential ?uid pressure operated
motor having a pressure movable unit therein and
having'an end member at one end thereof, an
end of said ?uid cylinder being closed and form
ing a control chamber communicating with the Car axially arranged ?uid cylinder carried by said
end member and having one end forming a pres
master cylinder, a control valve mechanism for
sure chamber communicating with the brake
said motor arranged therewithin, and a pair of
cylinder, a ?uid-displacing piston movable to
ward such end of the booster cylinder to displace
?uid therefrom into the brake cylinder, the other
end of said ?uid cylinder being closed and form
ing a control chamber communicating with the
master cylinder, a control valve mechanism for
' ?uid displaced intovsaid control chamber from
said motor arranged therewithin, a second pis
said master cylinder, said other element of said
pair having a portion arranged to directly enter 15' ton movable in said ?uid cylinder and de?ning
one end of said control chamber, said second
said pressure chamber to boost the hydraulic
elements relatively movable parallel to each other
axially of said motor, one of said elements con
necting said piston to said pressure movable unit
and the other element being connected to said
control valve mechanism and being operable by
pressure therein.
7
piston having an annular ?ange’ portionsur
rounding the ?rst named piston and movable
10. A brake operating mechanism for a hydrau
therewith to displace ?uid from said pressure
lic brake system having a hydraulic brake cylin
der and a pedal-controlled master cylinder, com 20 chamber, a piston rod connectingthe ?rst named
piston to said pressure movable unit, and a sleeve
prising a differential ?uid pressure operated mo
slidably
surrounding said piston rod .and having
tor having a pressure movable unit therein and
its respective ends mechanically connected to
having an end member at one end thereof, an
said second piston and to said valve mechanism,
axially arranged ?uid cylinder carried by. said
said pistons being movable relative to each ,other.'
end member and having one end forming a pres
13. A brake operating mechanism for a hy
sure chamber communicating with the brake cyl
draulic brake system having a hydraulic brake
inder, a-?uid-displacing piston movable toward
cylinder and a pedal-controlled master cylinder,
such end of the booster cylinder to displace ?uid
comprising a differential ?uid pressure operated
therefrom into the brake cylinder, the other end
of said ?uid cylinder being closed and forming 30 motor having a pressure 'movable unit therein
and having an end member atone end thereof,
a control chamber communicating with the mas
an axially arranged ?uid cylinder carried by said
ter cylinder, avcontrol valve mechanism for said
end member and having one end forming a pres-,
motor arranged therewithin, said control valve
sure chamber communicating with the brake cyl
mechanism having valve elements carried by
said pressure movable unit and a lever device 35 inder, and a ?uid-displacing piston connected
to said pressure movable unit and movable toward
for operating said valve elements, and a pair
such end of the booster cylinder to displace ?uid
of elements relatively movable parallel to each
therefrom into the brake cylinder, the other end
other‘axially of said motor, one element of said
of ,said ?uid cylinder being closed and forming ,
pair connecting said pressure movable unit to
a control chamber communicating with the mas
40
said piston, the other element, of said pair hav
‘ter cylinder, a control valve mechanism for said
ing operative engagement with said lever device
and being operable by ?uid displaced into said"
motor arranged therewithin and having a pair of‘
valve elements carried by said pressure movable ,
control chamber from the master cylinder, said
unit on oppositesides of the axis thereof,’ one
otherrelement of said pair having a portion
arranged to directly enter said pressure chamber 45 valve element controlling communication between
opposite ends of the motor and the other, con-,
to boost the'hydraulic pressure therein.
trolling communication between one end of said '
11. A; brake operating mechanism for a hydrau
motor and a source of pressure differential, and
lic brake system having a hydraulic brake cylin- , '
a lever having end portions mechanically engag
der and a’pedal-controlled'master cylindergrcom
50
ing
said valve elements, and a pair of elements
prising a diiferential ?uid pressure operated mo
tor having a pressure movable, unit therein and
having an end member at one end thereof, .an
relatively movable parallel to each other axially
, of said motor, one element of said pair connect
ing said pressure movable unit to said piston,
the other element of said pair having operative
end member and having one end forming a pres
sure chamber communicating with the brake cyl 55 engagement with said lever centrally thereof and’
being operable by ?uididisplaced into ‘said, con
inder,,a ?uid-displacing piston connected to said
trol chamber from, the master cylinder, said other
pressure movable unit and movable toward such
element of said pair having a portion‘ arranged
end of the booster cylinder to displace ?uid there
to directly enter said pressure chamber to boost
from into the brake cylinder, the other end of‘
axially arranged ?uid cylinder carried by said
said ?uid cylinder being closed and forming a 60 the hydraulic pressure therein,
14. A brake operating mechanism for a, hy
control chamber communicating with the mas
draulic brake system having a hydraulic brake
ter cylinder, a control valve mechanism for said
cylinder and a pedal-controlled master'cylinder,
motor arranged therewithin, a second piston mov
comprising a differential ?uid pressure operated
able in said ?uid cylinder and de?ning one end
motor
having a pressure movable unit therein
65
of said control chamber, said second piston hav
and having an end member at one end thereof,
ing an annular ?ange portion surrounding the
an axially arranged ?uid cylinder carried by said
?rst named piston and movable therewith to dis
end
member and having one end ‘forming a pres
place ?uid from said pressure chamber, and
sure chamber communicating with the brake cyl
means for operating said control valve mecha
nism by said second piston incident to the dis 70 inder, a ?uid-displacing piston movable toward
such end of the booster cylinder to displace ?uid
placing of ?uid into said control chamber from
therefrom into the brake cylinder, the other end
the master cylinder, said second named piston
of said ?uid cylinder being closed and forming
being movable relative to said ?rst named piston.
a control chamber communicating with the mas
,12. A brake operating mechanism for a hy
draulic brake system having a hydraulic brake 75 ter cylinder, a control valve mechanism for said
1
2,407,856
13
motor arranged therewithin and having a pair
of valve elements carried by said pressure mov
able unit on opposite sides of,the axis thereof,
one valve element controlling communication be
tween opposite ends of the motor and the other
14
having an annular ?ange portion surrounding
said ?rst named piston and movable therewith to
displace ?uid from said pressure chamber, a pis
ton rod connecting the ?rst named piston to said
pressure movable unit, and a sleeve slidably sur
controlling communication between one end of
rounding said piston rod and having one end
said motor and a source of pressure differential,
connected to the second piston, the other end
and a 1ever having end portions mechanically
of said sleeve having mechanical engagement
engaging said valve elements, a second piston
with said lever centrally of the length thereof,
movable in said ?uid cylinder and de?ning one 10 said pistons being movable relative to each other.
end of said control chamber, said second piston
WILLIAM STELZJER.
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 396 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа