close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2119001

код для вставки
_May 31, 1938.
F. J. BACHMANN
l
2,119,001
HYDRAULIC BRAKE EQUALIZER
Filed Sepp 4, 1936
il zu ,
l
l
,ep ,ik
1424. .7€ ß
. á
'
Patented vMay 31, 1938
2,119,001
UNITED STATES
PATENT oFFlcE
2,119,001
HYDRAULIC BaAxn EQUAuzna
'Frank J. mnmn?gëchicun. nl.
Application september-nisse. semi No. 99,401
`
1 claims.
(ci. 'áoaâs'ii
This invention relates to brake mechanism for
ever, as this is considered a matter to be deter
motor vehicles and the like and more especially .=¿ mined as met in practice, the details of which are
to means for actuating and equalizing` hydraulic "well understood by automotive engineers, I have
brakes. Hydraulic brakes for motor vehicles as not‘vattempted to show any particular form of
constructed heretofore possess an important in-. suchè a seati but it will be understood that such
herent weakness. A complete failure of the a seal may be employed if found desirable or
brakes often results because of a leak in one of necessary.
the pipe lines between the actuating means or
The piston I4 is actuated or reciprocated by
master cylinder and its associated operating an adjustable push rod I5 connected to the usual
10 mechanism on the wheel. It is to overcome this motor vehicle brake pedal, the details of which
dangerous and objectionable condition that my arrangement are well known to those sln'lled in the
present invention has been developed, as will be a‘rt and not shown further herein. A bracket I6
clear from the following specification.
It is therefore a general object of the invention
15 to provide a simple, practical, and reliable brake
actuating mechanism of the character described.
Another object is to provide insuch a brake
mechanism means for automatically isolating any
particular brake wheel actuating mechanism that
20 has become inoperative because of a leak in the
system leading to that brake, and at the same
time maintaining complete operativeness and bal
ance of the remaining wheel brakes.
Other related objects and advantages will ap
25 pear and be brought out more fully in the fol
supports the housing II, being suitably secured
'thereto by bolts or otherwise, and is secured to
a convenient portion of the frame of the motor
vehicle by mounting bolts I'I. A suitable cover
I8 is provided for the reservoir I2 to which it is
secured by bolts I9 threaded into bosses 20 in
the upper part of the housing Il. The cover I8
has a shouldered filling aperture 2| closed by a 20
threaded square head plug 22 suitably provided
with Ventilating passages 23. An inlet port 24
leads from the reservoir I2 to cylinder I3 whereby
the cylinder is normally kept full of liquid from
the reservoir I2, the normal or inoperative posi
tion of the piston I4 being in the position shown in
Fig. 1. A pair of cylinders 25 are located in the
lowing description, reference being had to the
accompanying- drawing, wherein:
Fig. Ii is an elevation in central section of a~ upper portion of the housing II and in a manner
preferred embodiment of my invention; .
30
Fig. 2 is a cross-sectional elevation taken along
the line 2-2 of Fig. 1;
Fig. 3 is a similar view taken along the line
3--3 of Fig. 1;
Fig. 4 is 'a fragmentary sectional view taken
35 along the line 4_4 of Fig. 1; and
Fig. 5 is a fragmentary view illustrating one of
the valves comprising an important feature of the
_ invention.
Referring more particularly to the drawing, I
40 show hydraulic brake equalizing and actuating
mechanism generally by the numeral I0, which
consists essentially of a metallic housing II pref
erably of cast iron or equivalent material, in the
upper portion of which is a reservoir I2 for the
45 operating fluid which is usually aV specially pre
25
«similar to cylinder I3 have an open end. A
similar pair of open end cylinders 26 are located
in the lower portion of the housing I I, the cylin
ders 25 and 26 each having a communicating
passageway or port 2l connecting them with the
master or main cylinder I3.
Elbow couplings 28 connect the upper cylinders
25 with pipes 29 which lead to two of the motor
vehicle wheel brakes and preferably to the front
wheel brakes for a reason which will be apparent
hereinafter. Similarly elbow couplings 30 con
nect cylinders 2€ with pipes 3| leading to the re
maining two wheels of the vehicle. In each of
the cylinders 25 and 26 is located an equalizing
piston or valve 32, the pistons being adapted to
reciprocate in the cylinders in a manner similar
to piston I4. The cylinders 25 and 26 together
pared oil. In the lower portion of the housing I with ports 21 provide passageways between the
have provided a main cylinder I3 open at> one end master cylinder I3 andthe pipes 29 and 3I, and
in which is adapted to reciprocate a master pis
together withpistons 32 comprise shut-off valve ‘
ton I4, the clearance between the piston and the mechanism for these pipes. A circular recess or
50 cylinder being very small in order to prevent the shoulder 33 is provided in the housing II at the
leakage of the liquid past the walls of the piston. open end of cylinder I3 and forms a seat for one It may be found advisable under certain circum , end of a spring 34. A resilientsnap ring 35 is
stances in order to prevent leakage of the liquid retained by its resiliency in a semi-circular groove
past the piston I4 and the pistons 32 as herein-'~ , Y'36 adjacent the openend of cylinder I3 and serves
after described to provide a packing ring.l How
as a stop for the piston I4, as will be clear from 55
2
2,119,001
Fig. 1. The piston I4 has a reduced portion 31
and a further reduced end portion 35, the latter
being secured to a circular ilange member 35
having a bore 45 adapted to receive the reduced
portion 35. The member 35 has a flange ring 4|
having a face 4Ia adapted for a function to 'be
described hereinbelow. A hub 42 is also provided
on member 35 and a locking pin 45 secures the
piston~member .|4 to flange member 35. In the
opposite end of member 35 a conical bore 44 is
formed in an extension 45 of the member 55,
bore 44 having a rounded seat 45 adapted for
engagement with the rounded end 41 of a push
rod extension member 45. The member 45 has a
15 threaded borel 45 and a flange 55, the bore 45
having a threaded attachment to a threaded por
tion 5I of push rod I5, a suitable locking nut 52
being provided to prevent loosening of these
parts. 'I‘he rod I5 has a pivoted end 55 for en
20 gagement withthe operating arm of the brake
pedal.
A neck 54 is formed on the housing II and has
a groove 55 and a flange 55 adapted for the at
tachment of one end of a tubular flexible boot 51,
25 the terminal edge of the boot having a bead 55
adapted to be retained in the groove 55, and a
locking ring 59 may be employed to secure the
bead 55 in groove 55. A similar beaded neck 55
is formed at the opposite end of the boot 51, a
30 similar locking ring 5I being provided to securel
the neck 55 to the flange 55.
The pistons 32, one of which is shown in detail
in Fig. 5, each have a reduced portion 52 and a
ders 25 and 25 which pressure will operate to
maintain the pistons 32 in the left end oi' cylin
ders 25 and 25 or against the stop rings 54. Sub
sequent forward movement of the pedal and push
rod I5 will cause face 4Ia of the flange ring 4I to
press against free ends 51 of the springs 55, the
other ends of which will press against the shoul
ders 33 of pistons 32. This movement would have
a tendency to move the pistons 32 to the right,
which movement, however, is prevented inasmuch
as the spring tension of the springs 55 is insuf
ficient to overcome the fluid pressure against the
opposite ends of the pistons 32.
If, however, any one of the pipes 29 or 3| has
developed a leak permitting the removal of the l5
fluid therein, there will not be suilicient pres
sure developed in its associated cylinder 25 or 25
to retain piston 32 in its initial position, and the
movement of rod I5 and flange ring 4I upon
reaching the end 51 of the spring 55 will now
cause the piston 32 associated with the faulty
pipe to be shifted to the right, a small movement
of which will carry the end past its associated
port 21. thus shutting off the pipe and permitting
the pressure of the master cylinder to be main
tained inthe remaining pipe lines,.it being under
stood that this pressure will be equalized in these
pipes by ports 21, and the actuation of the brakes
associated _therewith will occur. The piston or
pistons 32 which have thus been shifted to the
right upon the failure of such faulty pipe lines
29 or 3| will thereafter be maintained in position
shoulder 53, _the latter being adapted to secure
to keep their respective ports 21 closed during
subsequent operation of the brakes and until the
35 the piston against removal from the cylinder 25
with a snap ring 54 located in a semi-circular
faulty line has been repaired, there being no way
groove 55 in the cylinder wall. A coil spring 55 is
retained in position around the reduced portion
52 of each piston 32, one end of the spring 55 be
ing against the .shoulder 53, the spring having a
free end 51 which in normal position is spaced
mal position except the actual return thereof by
a short distance from the face 4Ia of the ring
4|. The reduced portion 52 of each piston 32
has an end face 53. Each piston 32 is preferably
45 provided with a circular groove 59 in which a
locking screw 10 is adapted to be advanced when
under certain circumstances it is desired to lock
the pistons 32. Each screw 15 is secured in a
threaded bore 1I in the housing |I, lock nuts 12
50 being employed to hold the screws 15 in retracted
position as shown in Fig. 4 during normal actua
tion of the brake mechanism. The pistons 32 are
locked by the screws 15 when it is desired to flll
the pipe lines 29 and 3| initially, after a necessary
bleeding of the pipes during servicing, or after
damage to any of the pipes or brake mechanism,
as will be apparent hereinafter. A threaded bore
13 may be provided in the end wall of the cylin
der I3 for the reception of the well-known stop
light switch 14.
-
The operation of my invention is as follows:
Assuming the pipes 23 and 3|, the cylinders I3,
25, and 25, and reservoir I2 to be filled with the
proper actuating oil or other fluid, the brake
pedal upon being depressed will actuate push rod
I5 to the right as shown in Fig. 1, forcing the
master piston I4 to the right a short movement
which will carry its free end beyond inlet port 24,
further movement of which will develop a pres
70 sure in cylinders I3, 25, and 25, and pipes 29 and
3|, thus actuating the brakes on the wheels of a
motor vehicle, the liquid from cylinder I3 passing
to cylinders 25 and 25 through passageways or
ports 21. 'I'he initial movement of the pedal and
push rod I 5 will create this pressure in the cylin
in which said pistons can be returned to the nor
a service man by a proper tool such as a pair of
pliers applied to the reduced portion 52 or by the
removal of one of the fittings 25 or 30 and a rod
or screwdriver used at the right end.
In the event that the fluid should have escaped
from the master cylinder I3 but suillcient fluid
was retained in one or more of the small cylin
ders, for instance the lower cylinders 25, the
brakes associated with the cylinders 25 can be op
erated by suillciently great movement of the push
rod I5, initial movement of which would close off
ports 21 and engagement would occur' between
the ends 53 of the associated pistons 32 and the
face 4Ia of flange ring 4I. This would enable the
pedal pressure to positively move the said pistons
32 to create sutllcient presure in the cylinders 25
to actuate the brakes connected with the pipes 3|
and thus sufdcient brake mechanism would be
employed on the motor vehicle to prevent an ac
cident. It will be understood that such braking
action would ordinarily be indicated to the driver
in time for necessary repairs to be made.
For the reasons 'just pronounced the brake cyl
inders 25 and 25 have been preferably arranged
around the master cylinder I3. However, com
mercial practice may show that it is satisfactory
to have them all arranged below the master cylin
der i3, it being understood that the embodiment
shown is illustrative of my invention and 'not in
tended to limit its mode of application.
While I have illustrated and described the pre
ferred form of construction for carrying my in 70
ventioninto effect, this is capable of variation
and modification without departing from the
spirit of the invention. I, therefore, do not wish
to be limited to the precise details of construction
set forth, but desire to avail myself of such varia 75
9,119,001
tions and modifications-as come within the scope
sure, and to be actuated by said pedal actuating
o1' the appended claims.
Having thus described my invention, what I
means to close of! its said passageway upon the
inability of its associated pipe to maintain said
claim as new and desire to secure by Letters
Patent is:
pressure.
1. Hydraulic brake actuating and equalizing
means as described, comprising a liquid reser
voir, a pressure cylinder, a piston in said cylinder
adapted to create said pressure pedal actuated
10 means engaging said piston, a plurality of pipes
each connecting said cylinder and one oi the
brakes; said pipes adapted to retain liquid there
in, whereby to transmit said pressure to said
brakes, and means adapted upon the failure of
15 any one of said pipes to transmit said pressure
to close oñ said pipe from said cylinder, said
means including a valve adapted to be kept in
operative by normal pressure in said pipe and.
adapted to be operated upon subnormal pres
20 sure occurring in said pipe said valve adapted to
be engaged by and actuated by said' pedal ac
tuated means.
2. Hydraulic brake actuating and equalizing
means as described, comprising a housing, a cyl
inder, a pluralityof pipes each connecting said
cylinder to one of the brakes, a reservoir adapt
ed to keep said cylinder and pipes illled with ac
tuating fluid, a pedal actuated piston adapted to
create pressure in said cylinder and pipes, a
30 passageway in said housing for each of said pipes
to said cylinder, and a pedal actuated valve in
each of said passageways adapted to close its re
35
40
3
5. Hydraulic brake actuating and equalizing 5
means as described, comprising a housing having
a liquid reservoir and a pressure cylinder, a pis
ton in said cylinder adapted to create said pres
sure, pedal engaging and actuating means for
said piston, a plurality of valve cylinders in said 10
housing, a passageway between each said valve
cylinder and said pressure cylinder, a plunger
valve in each said valve cylinder adapted when
actuated to close ofi its said passageway to said
_pressure cylinder, each said valve having a stem 15
and a spring adapted to engage said pedal ac
tuating means, and a pipe connecting each said
valve cylinder and one 'of the brakes, said valves
each being adapted to be normally held open by
said pressure, and to be actuated by said pedal 20.
actuating means and spring to close off its said
passageway upon the inability of its associated
pipe to maintain said pressure.
6. Hydraulic brake actuating and equalizing
means as described, comprising a housing having
a liquid reservoir and a pressure cylinder, a pis
ton in said cylinder adapted to create said pres
sure, pedal engaging and actuating means for
said piston, a plurality of valve cylinders in said
housing, a passageway between each said valve
cylinder and said pressure cylinder. a plunger
valve in each said valve cylinder adapted when
spective passageway upon the inability or its as
actuated to close oil its said passageway to said
sociated pipe to maintain said pressure.
pressure cylinder, each said valve having a stem
adapted to engage said pedal actuating means,
3. Hydraulic brake actuating and equalizing
means as described, comprising a housing, a cyl
and a pipe connecting each said valve cylinder
inder, a plurality> of pipes each connecting said
cylinder to one of the brakes, a reservoir adapt
ed to keep said cylinder and pipes nlled with ac
and one of the brakes, said valves each being
adapted to be normally held open by said pres-sure, and to be actuated by said pedal actuating
tuating iluid, a pedal actuated piston adapted to
means to close oi! its said passageway to said 40
create pressure in said cylinder and pipes, a pas
sageway in said housing for each of said pipes
to said cylinder, and a pedal actuated valve in
each of said passageways adapted to close its re
spective passageway upon the inability of its
215
associated pipe to maintain said pressure, said
valves adapted to be normally retained in inop
erative position by said pressure.
4. Hydraulic brake actuating and equalizing
means as described, comprising a housing hav
ing a liquid reservoir and a pressure cylinder. a
piston in said cylinder adapted to create said
pressure, pedal engaging and actuating means for
said piston, a plurality of valve cylinders in said
housing, a passageway between each said valve
55 cylinder and said pressure cylinder, a plunger
valve in each said valve cylinder adapted when
actuated to close oiI its said passageway to said
pressure cylinder, each said valve having a stem
adapted to engage said pedal actuating means,
60 and a pipeconnecting each said valve cylinder
and one of the brakes,- said valves each being
adapted to be normally held open by said pres
pressure cylinder upon the inability of said
pressure cylinder to maintain its said pressure.
'7. Hydraulic brake actuating and equalizing
means as described, comprising a housing hav
ing a liquid reservoir and a pressure cylinder, a
piston in said cylinder adapted to create -said
pressure, pedal engaging and actuating means
for said piston, a plurality "of valve cylinders in
said housing, a passageway between each said»,
valve cylinder and said pressure cylinder, a
plunger valve in each said valve cylinder adapt
ed when actuated to close on its said passageway
to said pressure cylinder, each said valve having
a stem and a spring adapted to engage said pedal
actuating means, and apipe connecting each said
valve cylinder and one of the brakes, said valves
each being adapted to be normally held open
by said pressure, and to be actuated by said pedal
actuating means and spring to close off its said
passageway to said pressure cylinder upon the
inability o! said pressure cylinder to maintain its
said pressure.
'
FRANK J. BACH'MANN.
n,
Документ
Категория
Без категории
Просмотров
0
Размер файла
568 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа