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Патент USA US2127740

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' Allg- 23, 1938‘
‘
v
‘
'
L. E. LA BRIE
‘
2,127,740
BRAKE‘
'
Filed Dec. 19. 1955 ‘
'
4QSheetS-Sheet 1
v2.6.
INVEN TOR.
L (/0451? _ A’. LA BIZ/E
BY
'
)(nLdva/
A TTORNEY.
‘
Aug. 23, 1.938-
.
_
‘
1.; a. LA BRIE
BRAKE
v
2,127,740
'
Filed Dec.' 19. 1935
'
.
4 Sheets-Shéet 2
-INVENTOR.
L 0045/? f. L ABE/E
ATTORNEY
_
Aug- 23, 193-3- '
L. E. LA BRIE
'
'
2,127,740
BRAKE
Filed Dec. 19, 1935
4 Sheets-Sheet 3
59
20
£76.?
INL/ENTOR. . -
A (1045/2, 5. LA ER/E
ATTORNEK
'
Aug. 23, 1938. '
L. E.‘ LA BRIE
‘BRAKE
' >
v
2,127,740
.
Filed Dec. is, 1955
4 Sheets-Sheet 4
.
INVENTOR.
41/0657? E LA?/EV: ‘
BY
‘
a
'
'
ATTOR
-
E14
‘
2,127,740
Patented Aug. 23, 1938
UNITED STATES PATENT OFFICE
'
2,121,140
BRAKE
udger E. La Brie, Detroit, .Mich., assignor to
Bendix Products Corporation, South Bend, Ind,
a corporation of Indiana
Application December 19, '1935, Serial No. 55,218
12 Claims.
(01. 188-140)
'
It
is
expressly
understood,
however, that the
This invention relates to‘ motor vehicle power
brakes and more particularly to those known‘ drawings are employed for purposes of illus
as mechanical servo brakes, wherein the power tration only and are not designed as a de?nition
obtained for brake operation is derived from ‘of ‘the limits of the invention, reference being
V 5
5 torque taken from a controllable friction device, had for this purpose to the appended claims. '
In the drawings, wherein like reference numer
associated with a direct connection with the pro
peller shaft of a vehicle or its equivalent, the ‘als indicate like parts:
Fig. 1 is a longitudinal section taken through
friction device being so arranged that brake en
gagement is readily regulated by controlling the the friction and actuating mechanism of a. me
‘
V
extent of frictional contact between a continu~ chanical servo;
Fig. 2 is an end view of the servo of Fig. 1 illus
ously rotating element and an element whose
trating the linkage and connections to a. vehicle ~
rotation is adapted to operate the brakes. A dis
tinguishing feature of the present invention is an brake operating cross-shaft;
Fig. 3 is an end view of the mechanical servo
arrangement whereby the degree of braking
of Fig. 1 supplied with a modi?ed linkage for the i5
' force and the degree of movement of the brak
ing linkage affects the operation of the friction transmission of power to the brake operating
cross-shaft;
'
‘
i in] i
controlling member, so that the operator is en
Fig. 4 is a top view of the linkage of Fig. 3;
V
abled to feel‘ the extent of braking action, the
Fig. 5 is a side view of the mechanical servo
operation of the controlling memberbeing gen
taken on a plane passing through the line 5-5 20
20 erally proportional to the power effort transmit
of Fig. d; '
ted to the brakes.
Fig. 6 is an end view of a detail of a portion of
Accordingly, it is an 'object of this invention to
provide a new and improved mechanical servo the cross-shaft as viewed from a plane indicated
V
brake employing a friction brake operating at 6-6 in Fig. 3;
Fig. '7 is a sectional view of the mechanical 25
torque
device
together
with
novel
actuating
25
servo of Figs. 1 and 2 taken on the line 1-1 of
means for the friction device.
.
Another object of the invention is to provide Fig. i;
Fig. 8 is a top view of e. modi?ed form of me
a new and improved mechanical servo brake of
chanical servo with a different brakeoperating
the friction type wherein the actuating means re
cross-shaft linkage;
,
30 quires a force in proportion to the brakeoperat
Fig. 9 is an end elevation of the mechanical
ing power developed by the mechanical servo.
A further object of the invention is to provide servo of Fig. 8, portions being cut away, partic
a new and improved mechanical servo brake of ularly as on the'line 9—9 of Fig. 10, and
Fig. 10 is a side elevation of the same, a por
the friction type wherein the actuating means re
tion thereof being shown in section as indicated 35
35 quires a movement in proportion to the move
_
ment of the brake operating linkage operated by the section line Ill-I0 of Fig. 9.
Referring to the drawings and more particu- '
by the mechanical servo.
larly to Figs. 1, 2 and 7, there is shown a trans
Still another object of the invention is to pro
vide a new and improved mechanical servo mission or gear box 20 having mounted on the
back end thereof a casing 22 enclosing a shaft
40 brake of the friction type wherein the actuating
means therefor requires a movement in propor
tion to the movement of the brake operating
linkage operated by the mechanical servo and
requires an actuating force in proportion to the
45 brake operating power developed by the mechan
ical
servo.
'
'
Other objects of the invention have to do with
the constructions and modi?cations employed to
obtain the results incident to the foregoing ‘ob
50 facts and to provide structures of simplicity, rug
gedness, reliability and emcient operation.
The above and other novel features of the in
vention will appear more fully hereinafter from
the following detailed description when taken in
65
conjunction with the accompanying drawings.
extension 2!, the latter being provided with ‘a
spiral gear 26 meshing with a second spiral gear
28 mounted on an axis at right anglesthereto
and therebelow. The spiral gear 28 is splined
to a. shaft 30 carried in and extending through a
plain bearing 32 in one side of the casing 22 and
in‘ a double thrust anti-friction bearing 3| rig
idly ‘held in place between the bearing support
plate 36 and a side cover plate 38.
The casing 22 ‘is provided with a cylindrical
outwardly facing cup or shell 3!‘ on the, plain
bearing side thereof to which is secured a‘ cover
plate 40 integral with stub shaft bearing sup
port 42.
The shaft 30 extending through the -‘
plain bearing 32 in the side of the casing 22 is 55
2
2,127,740
provided with a ?ange 44 to which is secured
a cup-shaped spider 40, the latter substantially
?lling the outwardly facing cup or shell 39 and
carrying an annular rotatable friction disc 40,
the same being splined to the spider40 by inter
engaging slots and teeth 00.
The annular friction disc with friction linings
02 and 04 is adapted to be engaged by relatively
of linkage connecting the power servo with the
cross-shaft is illustrated wherein the '“feel” trans
mitted to the actuating lever or pedal through
link I02 is a combination of the rotation of the
stationary although slightly rotatable friction
of, the other end'of which is connected through
a link I00 to the actuating lever 04', which is 10
offset as shown to bring it somewhat in line with
lever arm 80'. The cable 94' is then connected
10 plates 00 and 00 located on either side of friction
disc 40 and supported from and splined on a
stub shaft 00 rotatably carried in the stub shaft
bearing support 42, the stub shaft being aligned
with the shaft 00. The stub shaft 00 is provided
15 with a shoulder 02 on its end adapted to limit
the axial movement of one'of the plates 00 and
00, and a helical compression spring 00 is located
around the shaft 00 between the plates to nor
mally separate the plates from engagement with
to .the ?oating lever .at any suitable point such
as I06, it being understood that the point may‘
be varied in its distance from the connection I08
between the ?oating lever and the arm 88' de
pending upon the extent of the desired torque
reaction desired on the actuating cable I02, the
greater the distance, the greater the reaction.
It will also be understood that the torque reac
'20 the friction disc 40.
Located on the shaft 00 and between the bear
tion of this particular modi?cation applies only
ing support 42 and the friction plates 00 and 00
for brake actuation wherein the cable 94' is
‘under tension and thus operates for one direc
tion of rotation of the shaft 00, although a similar
are a pair of rock levers 04 and 00, each of which
has a hub portion 00 and ‘I0 having conical re
26 cesses ‘I2 in the adjacent faces thereof which
contain thrust balls ‘I4. Relative rotation of the
' levers thus produces an axial spreading action
which reacts upon a threaded adjustment sleeve
10 and forces the friction plate 00' towards the
30 friction plate 00 thereby frictionally engaging the
annular friction disc 40. The lever 04 reacts
through a thrust bearing 00 which may be, if
desired, keyed to the sleeve ‘I0 and which also
contains grease retaining washer 00. The
35 lever- 00 likewise acts through a thrust bearing
v0‘I which may, if desired, be keyed to a thrust
sleeve ‘I0 and the plate 00.
Grease retaining
washers ‘II and ‘I0 are also provided, the washers
_00, 'II and "being necessary in view of the open
slot 4| in the casing 42 through the levers ex
tend and the provision for greasing from a grease
?tting 00, rather than the lubricant in the trans
mission. The position of the sleeve ‘I0 may be
variedat will for adjustment purposes and locked
45
cross-shaft and the torque applied thereto. For
this purpose, the lever arm 88' is not directly
connected to the cross-shaft lever 96’ but is '
connected to a ?oating lever I04 at one end there
in place by the clamping bolt 02 acting 'on the
split end of the casing 42.
'
- I In Fig. 2, there is shown a wheel brake operating
cross-shaft 04' from which the vehicle brakes
' a may be operated. The shaft 00 which is splined
to the friction plates 00 and 00 is provided at its
exposed end with a lever having oppositely ex
tending arms 00 and“ and a splft hub 00 with
a clamp bolt II.‘ The lever arms are connected
.by ?exible cables 02 and 04 to a lever 00 fixed
to the cross-shaft 04, so that-rotation of the shaft
00 in either direction will tension one cable and
buckle the other to always rock the cross-shaft
in one direction only. The lever arm 00 is shown
vas slightly shorter than arm 00, thus permitting
the attachment of cable 02 on lever 00 at a point
20
arrangement may be inserted in the link 92' to -
make the apparatus torque responsive for either
direction of rotation.
In Figs. -8, 9. and 10 a modi?ed form of the
present invention'is illustrated, the same how
ever comprising a transmission power take-oh"
having a casing I20 secured to the rear of the
usual transmission casing I22. The transmission
drive shaft I24 which extends into the power
take-oi! casing I20 is provided with an exten
sion sleeve I20 splined thereon which emerges with a universal joint ?ange I20 from the rear
of the housing I20. The usual universal joint
I00 connecting the transmission to the propeller
shaft is secured to the ?ange I20, and the sleeve
is held on the drive shaft I24 by an extension 40
nut I00 and washer I00 engaging an internal
shoulder I00 in the sleevetand threaded con
centrically on the end I01 of the drive shaft I24.
The‘ sleeve is provided with a worm I32 for
driving a worm wheel I04, and also a speedom
eter worm I00. A packing I20 and oil slinger
I40 are associated. with the sleeve where it
emerges from the casing I20 to prevent the loss
of lubricant.
'
The worm wheel I04 is splined and ?xed in 50'
position on a shaft I42 having bearings I44 and
I40 in the housing I20, the shaft extending out
side the housing as at I40 and being provided
with a spline I00 for slidably carrying a friction
disc I02. Adjacent-the friction disc I02 is av 55
relatively stationary friction plate "4' mounted
on a'sleeve I00 rotatably supported on a cylin
drical bearing I01 surrounding the shaft bearing
I40 and concentric‘ therewith. The friction disc
I02 is adapted to slide on the spline I00 and a
spring I00 on the shaft I42 urges the'disc I02
It will be understood that one of the operating to the left or away from the plate I04. On the
levers 04 or 00 could be ?xed and the other actu- - extreme end of the shaft I42 are a pair of
ated to apply the brake. but to provide a measure nuts I00 forming a reaction shoulder vagainst
of “feei" in the actuation of the brake, one of which the thrust or actuating levers I00 and I02 65
the levers, for example 00, is connected to a‘ may bear whenoperating to move the disc I02
second lever 00 on the cross-shaft 04 by a cable to the right and into frictional contact with the
I00, and thus as the cross-shaft rocks, the lever plate I04. As in the modi?cation of Fig. ‘1,
00 is permitted to follow the movement of lever the levers I00 and I02 have collar parts I04
70 04 which is suitably connected to a hand lever and I00 with facing conical recesses I00 in which 70
or pedal through cable I02, so that the extent' are placed balls I00, so that relative rotation of
of movement of the cross-shaft can always be the levers I00 and I02 causes a spreading action.
felt by the extent of movement of the actuating As before thrust bearings I10 and "2 are pro
lever 04 due to the follow-up action of lever 00.
vided together with suitable packing I14, I10
In Figs. 3 to 6 inclusive, a slightlymo'di?ed form and I" so as to totally enclose the bearings and 75
70
short of the end.
‘
2,127,740
protect them from the elements. Likewise the
friction disc I52 is provided with a dust guard
I53 so that the exposed parts may be protected.
A stiff spring I18 tensioned between the casing
and an eye I18 secured to the plate I58 main
tains its supporting sleeve I88 against a shoulder
I88 at the end of the cylindrical bearing I51. A
felt dust guard I82 is likewise provided at the
, shoulder I88 to prevent entrance of dirt.
To deliver the' torque transmitted to the
10
fric
,
3
thereto but may be embodied in other mechanical
arrangements and forms. For example, the va
rious features of any one of the modi?cations
might be substituted for those of the other modi
fications. As such and other changes inv con
struction and arrangement may be made with
out departing from the spirit of the invention
as will be apparent to those skilled in the art,
reference will be .had to the appended claims
for a definition of the limits of the invention.‘
10
tion disc. I58, the same is provided with a pair
What is claimed is:
.
of studs I84 and I88 forming crank pins and a
1. In a mechanical servo power brake, a fric
pair of links I88 and I98 which extend there
tion disc driven from an automotive vehicle drive
from to a sector or bell crank lever I92 ?xed to shaft and rotatable therewith, a friction plate en
a wheel brake operating cross-shaft I94. The . gageable with said friction disc, means for trans 15
link I88 connected to the pin I84 located above‘ mitting torque from said plate to wheel brakes in
center is provided with a pin and slot connection cluding a coaxial shaft having levers at oneend
and said plate at the other, a pair of relatively
I98 to the bell crank I82 so that clockwise rota
tion of the friction plate I54 will cause clock
rotatable control levers coaxially arranged with
respect to said disc, plate and shaft and between 20
20 wise rotation of. the sector. The link I88 is con
nected to the sector or bell crank lever I82 and to said first named levers and plate, and means for
the pin I88 through an overrunning slot I88, the
pin I86 being below the center of the plate I88,
_ counter clockwise rotation thereof will produce
'30
clockwise rotation of the cross-shaft. It. will
also appear obvious that. active transmission
through one of the links I88 or I88 causes the
other to overrun by reason of the slots therein.
The cross-shaft is provided with one or more
levers such as 288 which may be connected to
causing relative axial movement between said ,
control levers on relative rotation thereof to en
gage said disc and plate, means for operating one
of the control levers, and means for permitting
the other control lever to move in direct propor
tion to the rotationof said‘plate.
.
‘
2. In a mechanical servo power brake, a fric
tion disc driven from an automotive vehicle drive
shaft and rotatable therewith, a friction plate en 30
the wheel brakes. In order that the extent gageable with said friction disc, means for trans
of operation of the brakes may be “felt” at the mitting torque from said plate to wheel brakes, a
foot pedal, the cross-shaft may be provided with pair of relatively rotatable levers coaxially ar
another lever 284 which is connected by a link ranged with respect to said disc and plate, and
35 288 to the lever I 82,'so that follow-up lever l?t means for causing relative axial movement be-. 35
tends to follow the movement of operating lever tween said levers on relative rotation thereof to
I88 connected to the usual foot pedal by a engage said disc and plate, and means interposed
cable 288.
’
'
in said transmitting means and associated with
The operation of either modi?cation should means for operating one of the levers to impose
on said operating means a reactive force propor
40 be readily understood from “the foregoing de
scription, and may be brie?y stated as follows. tional to the force transmitted by said torque
The main transmission drive shaft is such that
it always must rotate so long as the car is in
motion and the drive wheels rotating, and hence
the power take-o? cross-shaft geared direct
transmitting means.
movement in the control lever and its operating
of said transmitting means.
‘
4. In a mechanical servo power, brake, a brake
40
.
3. In a mechanical servo power brake, a fric
tion disc driven from an automotive vehicle drive
shaft and rotatable therewith, a friction plate en 45
thereto will always rotatewhen braking is de 'gageable with said friction disc, means for trans
sired. By rotating‘the operating lever relative mitting torque from said plate to wheel brakes, a
to the follow-up lever causes engagement of the. pair of relatively rotatable levers coaxially ar
friction disc and plate to a more or less degree ranged with respect to said disc and plate, and
50 depending on the will of the operator, thereby means for causing relative axial movement be 50
setting up a torque in the friction plate tending tween said levers on relative rotation thereof to
to cause rotation thereof. Through the suitable engage said disc and plate, means interposedin
linkage set forth, this torque is transmitted to the said transmitting means and associated with
means for operating one of the levers to impose
. wheel brakes. The amount of movement and
on said operating means a reactive force propor
55 in Figs. 3, 4,, 5 and 6 the amount of effort trans
mitted to the wheel brakes is transmitted to the _ tional to the force transmitted by said torque
operating lever so that movement and braking transmitting means, and meansfor moving the
force will always givea proportional feel or other lever in direct proportion to the movement
60
foot
pedal.
‘
-
-
,
There has thus been described two embodi
operating cross-shaft, a shaft rotatable in either
ments of a mechanical servo power brake unit
readily adapted for installation on the usual
direction and adapted, to have varying degrees
of torque applied thereto, oppositely extending
automotive vehicle without necessitating rede
levers on said torque shaft and connections there
65 sign or reorganization of the parts,‘ it being
from to a lever on said cross-‘shaft, means for 65
merely, necessary to substitute certain parts and
controlling the degree of torque in said torque
apply a housing to the rear of the transmission.
shaft, and means connected to a lever on the
cross shaft for producing a movement in said con
trolling means proportlon'al to the movement of
Where the universal joint is moved rearwardly to
accommodate this apparatus, the propeller shaft
70 is usually;v built of telescoping splined sections,‘
which may usually be conveniently telescoped to
provide the extra room required.‘ “
_
the cross-shaft.
.
I
r
70
5. In a mechanical servo power brake, a brake
operating cross-shaft, a shaft rotatable in either
Although two embodiments of the invention direction ‘and adapted to have varying degrees of
has been illustrated and described, it ‘is to be torquev applied thereto, oppositely extending le
P75 ‘understood that the invention is not to be limited vers on said torque shaft, a controlling lever for 75
4
2,127,740
controlling the degree of torque in said torque
shaft, a connection from one of said oppositely
extending levers to a cross-shaft lever, a second
connection from the other oppositely extending
lever through a floating lever‘ to the cross-shaft
lever, and a connection from the ?oating lever to
connections having a ‘floating lever interposed
therein, said lever being connected to one of said
pair of relatively rotatable levers, and means for
operating the one of said pair of levers connected
to the ?oating lever.
' 10. In a mechanical servo power brake, a torque
operating cross-shaft, a shaft rotatable in either
direction and adapted to have varying degrees of
shaft having a slidable friction plate splined
thereon, a stationary housing for said torque
shaft forming a support therefor, a sleeve around
said shaft threaded in said housing and forming 10
torque applied thereto, oppositely extendingv le
an adjustable thrust abutment, and an axial
said controlling lever. _
6. In a mechanical servo power brake, a brake
vers on said torque ‘shaft, a pair of relatively ro
tatable levers, relative rotation between which
controls the degree of torque in said torque shaft,
overrunning connections from said oppositely ex
tending levers to a cross-shaft lever and a con
nection from a lever on the cross-shaft to one of
said relatively rotative levers.
'7. In a mechanical servo power brake, a brake
operating cross-shaft, a shaft rotatable in either
direction and adapted to have varying degrees of
thrust producing means adapted to bear against
said sleeve and move said friction plate.
11. In a mechanical servoI power brake, a ve
hicle driven power shaft having a friction disc 15
splined thereon, means for moving the friction
disc axially into engagement with a relatively
stationary rocking torque plate, a pair of crank
pins on said plate disposed at an obtuse angle
from each other, a brake operating cross shaft 20
torque applied thereto, oppositely extending le
closely adjacent said plate and having a lever
with pivots thereon, and links with overrunning
vers on said torque shaft, a pair of relatively ro
slots connecting said lever pivots with each of _
, tending levers to a cross-shaft lever, a connection
from a lever on the cross-shaft to one of said rel
brake operating means, a rotational source of
power, means for deriving a torque from said
tatable levers, relative rotation between which said pins, said links extending in a tangential di
controls the degree of torque in said torque shaft, . rection from their respective pivots and pins.
12. In a mechanical servo power brake, a wheel
overrunning connections from said oppositely ex
atively rotative levers. and means for operating
.the other lever.
B. In a mechanical servo power brake, a brake.
- operating cross-shaft, a shaft rotatable in either
means and said operating means for assuring a
torque applied thereto, oppositely extending le
movement of said control means directly propor
tional to the movement of said operating means,
and means independent of said ‘torque deriving
means for assuring a constant ratio between ‘the
force applied to the control means and the force
transmitted from the source of power to the op
vers on said torque shaft, a pairof relatively ro
vers and a brake cross-shaft lever, one of said
connections having a ?oating lever interposed
therein, said lever being connected to one of said
’ pair of relatively rotatable levers, and a connec
uon from the other of said pair of levers to a
lever on said cross-shaft. '
.
i
.
- I. ‘In a mechanical servo power brake, a brake
operating cross-shaft, a shaft rotatable in either
direction and adapted to have varying degrees of
torque applied thereto. oppositely extending le
vers on said torque shaft, a pair of relativelyv ro
50
trolling the amount of torque derived from said
source and meansassociated with said control
direction and adapted to have varying degrees of
tatable levers. relative rotation between which
controls the degree of‘torque in said torque shaft,
connections between said oppositely extending le
40
source of power and for actuating said wheel
brake operating means, control means for con 30
erating means.
'
,
trolling the amount of torque derived from said
source and means independent of said torque de
riving means and associated with said control
means and said operating means for assuring a
tatable .levers. relative rotation between which
constant ratio between the force applied to the
oonnectionsbetweensaid oppoaiteiyextending le
the source of power to the operating means.
controlsthedeareeoftorqueinsaidtorqueshaft, controlling means and the force transmitted from
versand-abrakemahaftlevenoneofsaid
40
13. In a mechanical servo power brake, a wheel
brake operating means, a rotational source of
power, means for deriving a torque from said
source of power and for actuating said wheel
brake operating means, control means for con 45
‘
LUDGEB E. LA BRIE.
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