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Патент USA US3043415

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July 10, 1962
w. sussl-:BACH
3,043,405
ELECTRO-HYDRAULIC BRAKE:
Filed March 28, 1960
23
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Inventar.’
WALTER sussEßAC/v’
2, ¿o
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fis
3,043,405
Patented July l0, 1962
2
3,043,405
Walter Sussehach, Olpe, Westphalia, Germany, assigner
ELECTRO-HYDRAULIC BRAKE
to Elektro-Mechanik-G.m.b.H., Westphalia, Germany
Filed Mar. 2S, 1960, Ser. No. 18,176
Claims priority, application Germany Apr. 3, 195
v
4 Claims.
(Cl. 18S-151)
l
The present invention relates to brakes and more in
particular to electro-hydraulic brakes.
It is known in the art to provide brake for such ma
chines as, for instance, cranes, hoists, conveyers and the
like which are equipped with 'a brake-lifting device for
lifting the brakes, whereupon the brakes are returned to
their initial position by spring or weight means. The
brake-lifting device is connected with the brake shoes
by a lever arrangement and the lifting device is disposed
laterally of the brake disk.
More recently electro-hydraulic devices have proved
to be of particular advantage for use as brake-lifting ap
paratus. In particular, electro-hydraulic apparatus known
under the name of “Eldro” and described, for example,
in Patent 2,631,431, have a number of considerable ad
vantages. They operate smoothly and quickly, are un
pump unit as built into the structure of the brake frame;
FIGURE 5 is a fragmentary, side elevational view, i1
lustrating transmission means for speeding up the rotary
wing means relative «to the brake lever shaft in the electro
hydraulic ybrake according to the invention;
FIGURE 6 is a fragmentary, side elevational view, il
lustrating contact means for switching oif the greater
pump in the electro-hydraulic brake of the invention.
The stationary brake frame `10 is constructed as a pres
l0 sure liquid container and supports the two rotary wings
y11, which latter are each connected with a shaft 17 sup
porting the brake levers 12 and `131, respectively.
On
the brake levers 12 and '13 are mounted the brake shoes
15.
Each one of the levers `12 and 13 constitutes a uni
tary structure together with a rotary wing )11 and a shaft
17, the latters being rotatably mounted 4in frame 10 (see
FIG. 2). An upper bar 16 connects the brake levers 12
and 13 at their upper ends, and bears a return spring 16a,
for returning the brake levers and brake shoes into their
initial positions after having been actuated by rotary
wings y11. Resilient stop members 26 (whereof only
one 'has been shown for the sake of simplicity) can be
provided at the frame y10, in order to limit the movement
of brake levers 112 and 13'.
`
According to the invention the motor pump unit 14
sensitive to great voltage drops and make it possible to 25
also forms part of the frame structure or, as shown in
use even small portions of the full stroke, thereby reduc
FIGURE ~1, is closely connected therewith. This unit
ing the power consumption of the motor, particularly as
soon as the piston comes to a standstill.
14- cornprises the pump unit `18 with a pump 19 and pump
20, pump 19 having a greater capacity than pump 20. A
brake means making use of electro-hydraulic brake~lifting 30 pressure-operated valve 21 is connected wit-h pumps 19
and 20. Unit 14 further comprises a motor 22, e.g. an
devices and combine them with a complete brake ar
It is the object of the present invention to provide
electric motor, and an exterior ventilator 23 with cool
rangement in such a manner that a complete and com
ing ribs so as to provide a better cooling of pump unit
pact unit is obtained.
'18. A pipe conduit 24 connects the pumps with the rotary
Further objects and advantages of the invention will
35 wings "11 so as to supply pressure liquid to the latter.
become apparent as the description thereof proceeds.
Upon pumping of fluid, the rotary wings are driven
The objects are achieved by the electro-hydraulic brake
thereby and the torque produced becomes effective in the
of the present invention according to which the brake
brake levers \12 and 13y to release the brake. The frame
frame is so constructed that it is simultaneously used as
10 simultaneously constituting the pressure liquid con
thepressure liquid container. The brake levers are
moved by hydraulically operated members, such as par 40 tainer has leakage openings 2S for removing leakage
liquid.
ticularly rotary wings, »which are preferably positioned
As will be seen from FIGURE 2, the pressure liquid
container is constructed small enough to tit in between
the pair of brake levers 12, 13.
laterally attached to the liquid container or provided
Whereas in the embodiment of FIGURES 1 to 3
within the same. IFurthermore, the rotary wings dis 45
the motor-pump unit »is adjacent the brake frame and
placing the brake levers can be mounted either directly
in the frame structure and within the liquid container.
The motor pump unit of the apparatus can be either
on the brake lever shaft or on a shaft connected with the
connected therewith, for example, by its flange 27 to
ñange 2S of the brake fra-me 10, as shown in FIGURE 3,
it is also possible, according to another embodiment, to
As a pump itis possible to use hydrostatic pump means
of the twoastage type of different capacities, that is, 50 have the motor unit built into the structure of the brake
frame. This is illustrated in FIGURE 4, wherein pump
having a greater pump and a smaller pump, with the
unit 13 and motor 22 are Amounted against cover plate
greater pump being switched off by contact means or at
29 Iwhich latter is detachably mounted on the brake
f a predetermined pressure as soon as the rotary wings have
frame. The motor-pump unit is thus built into the frame
reached their end positions.
The pressure liquid container is preferably positioned 55 structure of brake frame 10, and can be removed there
from together with cover plate 29. Numeral 30 designates
between the pair of brake levers, so as to obtain a com
the level of pressure liquid in the brake frame 10, simul
pact unit. Both the pump unit and the motor can be
taneously constituting the pressure liquid container.
provided with a ventilator for cooling the same.
In operation, motor 22 drives pumps 19, 20, which
The invention will be more fully appreciated upon
the following description of the accompanying drawings, 60 convey pressure liquid through pipe conduit, so as to ac
tuate rotary'wings 1‘1, which then operate the brake
wherein
levers 12, `113, and thereby brake shoes 15. The movement
FIGURE 1 is a side elevational View of the electro
brake lever shaft by transmission means.
hydraulic brake according to the invention;
FIGURE 2 is a plan view of the electro-hydraulic
ofthe brake levers is limited by stop members 26, and
the brake levers are returned to their initial positions by
65 return spring 16a. As soon as the end position of the
brake according to the invention;
rotary wings r11 'has been reached, valve 21 causes the
FIGURE 3 is a fragmentary, side elevational view,
liquid conveyed by the greater pump to circulate without
partly in section, of the embodiment of FIGURE l, il
pressure, thereby greatly reducing the loa-d on motor 22
lustrating the motor-pump unit as closely attached to the
and thus economizing on power consumption.
brake frame;
FIGURE 4 is a fragmentary, side elevational view, 70 Whereas in FIGURES l and 2 the pump unit 13 is to
be understood as comprising a two-stage pump system
partly in section, of another embodiment of the electro
with geared pump means or vane-type pump means, it
hydraulic brake of the invention, illustrating the motor
Spaarne
3
»a
is, of course, possible to use other, conventional hydro
age means including said shaft means for positively inter
connecting said rotary wing means and said brake levers
dynamic pumps, selected ~in a known manner according
to the desired pressure values.
It will also be'of advantage to provide transmission
Vmeans between the brake -lever shaft 17 and thefrotary
wings `so as to speed -up the movement of the latter; this
l
for torque conversion and trans-mission, hydrostatic
pump means -with a first and a second pump thereof, said
first pump has a greater conveying capacity than said
second pump, and means for» switching off said first pump
will make it possible to operate at greatly reduced pres
as soon as said rotary rwing means engages said .wall
sure.
means.
Such transmission means may be of'the general -type,
'
2. Electro-hydraulic brake with Va brakeframe struc
schematically illustrated in FIGURE 5; a gear 32 is con
ture including a liquid `storage container, constituting a
nected »with rotary wing l11 and meshes with gear seg
support base for the brake, a pair of brake levers having
ment 33 mounted on the brake lever shaft 17, supporting
brake shoes operated above saidcontaiuer, hydraulically `
>brake'lever y‘13 with brake shoe `15.
operated rotary wing means disposed and supported in
said liquid container, shafts supported in said container
The gears are so
'dimensioned that the movement of rotary wing 11 ‘is
"speeded up relative to brake lever shaft 17, thus making
it possible to operate at far lower pressure.
and supporting said brake levers, a first’transmission gear
mounted on one of said shafts, and a second transmission
gear mounted on said rotary ywing «meaus'meshing with
said first gear, said iirst and second gear constituting a
transmission :means for decreasing the ,rotary speed vof
said lever relative to the rotary speed of said rotary
y A modification ofthe means for Switching' off the
greater pump as soon as the rotary wing means have
.reached their end positions, is shown in -FIGURE 6. In
stead Vofpressure-dependent valve 4means 21 it is possible
to provide contact means 34as shown in FIGURE 6,
for switching off pump A‘19, aspsoon as the rotary wing
v.means 11 have reached end position.
wing means.
3. Electro-hydraulic brake with a brake frame struc
ture including a liquid storage container constituting a
support base for the brake, a pair of brake levers having
The electro-hydraulically operated brake of the present
.invention offers considerable advantages over the art. 25 brake shoes operating above said container, shaft means
Due to the fact that the brake frame is used as the'pres
for pivotally supporting said levers at said container,
sure liquid container in the lifting unit, supporting two
wall means in said container constituting> apart thereof,
hydraulically operating rotary wing means disposed yin
' rotary wings operating the `brake levers, and due to the
fact that the motor pump unit is either closely attached
to the frame .or is provided within the same, a compara
said liquid container near said wall means, mechanical
linkage -means including said shaft means for positively
tively great cooling surface is obtained while, at the
same time, the overall size of the entire brake structure
. interconnecting said rotary wing means and said brake
is .comparatively small. ' The brake shoes and the return
pump means with a first and a second pump thereof
spring means (16a) are easily accessible. Due to the
small angular movement of the rotary wings which are
said first pump has a greater conveying capacity than
levers for torque conversion and transmission, hydrostatic
said second pump, and pressure-dependent valve means
for switching olf said iirst pump as soon as said rotary
wing means engages said Iwall means in said container.
4. Electro-hydraulic brake with a brake frame struc
in the order of less than -1/2°, the braking and lifting
periods are extremely small. The fact thatv the `rotary
wings are mounted directly on the brakev lever shaft
and particularly .the fact that transmission means can
ture including a liquid storage container, constituting-a
be provided speeding up the movement of the rotary 40 support base for the brake, a pair. of brake levers pivotally
Wings makes-it possible to «operate vat comparatively low
supported at said container and having brake shoes operat
. pressures.
.It Vhas been found that even for the greatest
brakes needed, a pressure of not more than 8 atmospheres l
is sufficient. By making the liquid container so small as
#to‘ñt inbetween the pair of brake levers a .compact unit 45
Y.is obtained.
It will be understood that this invention is susceptible
to modiiicat-ion in order to adapt it to different usages-y
and conditions and, accordingly, it is desired to com
prehend such modifications within this invention as^`may 50
fall within the scope of the appended claims.
What I claim is:
Y l. Electro-hydraulic brake with a4 brake frame struc
ture including a liquid storage container constituting a
support base for the brake, a pair of brake levers having 55
brake shoes operating above said container, shaft means
for pivotally supporting said levers at said container,
wall-means in said container constituting a part thereof,
hydraulically operated rotary wing means disposed and
supported in saidfliquid container, and mechanicaljlink
60
ing above said container, hydraulically operated rotary
wing means disposed in said liquid container, mechanical
linkage means for positively interconnectingjsaid rotary
wing vmeans and said` brake levers for torque conversion
and transmission, hydrostatic pump means with a iirst
and a second pump thereof, said iirst pump has a greater
conveying capacity than said -second pump, and` contact
means for-switching olf said iirst pump when. said rotary
wing engages «said contact switching means.
AReferences Cited in the iile of this_patent
UNITED STATES PATENTS,
906,344
1,637,025
1,778,317
1,993,612
2,328,619
2,612,241
Williams et al. ________ _., Dec. 8, 1908
McCormick ___________ _.. July 26, 1927
Goldman _____________ __ Oct. 14, 1930
Lum ________________ .__ Mar. 5, .1935
Cox _________________ __ Sept. 7, 19.43
Powell ______________ __ Sept. 30, '1952
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