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Патент USA US2125163

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‘July 26,1938; i
Fired July 9, 1934
¿fr Afr
Patented Julv 2s. 1938
. t"2.125.163
-Mn'rnon oF OPERATION lFoa Mo'roa
nmvEN VEHICLES wl'rn- Tonno-'rms
osk'ar' n. anker, wiener-Neustadt, Austria, and
Ernst Seibold, Heidenheim-on-.the-Brenl, Ger
many, assignors to J. M. voith,` Heidenheim
on-the-Brenz, Germany, 'a copartnership
composed _of Walther voith, Hermann voith.
and Hanns voith.
Application July 9, 1934, ‘ Serial No. 734,3991yá
In Germany July 10, 1933
1Claim. (ci. «sc-97) .
Y. The invention relates to a method _of operating same _whereby the characteristics, mentioned
vehicles with forward and reverse drive equipped before, are made use of.A
with hydrodynamic turbo-transmissions. These
With more particular reference _to the accom
hydrodynamic transmissions are characterized by panying drawing, and iirst to Figs. 1 and 3, our
the fact, that when they are engaged, i. e. when invention for purposes of illustration is shown in
their working liquid circuit is Ȗlled the motor connection with a vehicle I0, having wheels II.
is mechanically independent ofthe drive ele
The source of power may consist of any suitable
ment connected to drive-axle or drivewheels. engine or motor I3 arranged with its shaft Il
For instance it is possible to let such a vehicle extending longitudinally of the vehicle and co
10 roll backwards while the motor is running in axial with a separate shaft I5 which is to be 10
forward direction, for this purpose it is only driven.
necessary to reduce thel motor speed to such a
vAssociated with the shaft I5 4for operation
speed that the torque developed by the hydro
dynamic transmission is not suiilcient to over
thereby is a reversing gear transmission means
which is denoted as a whole by the reference nu
meral I6. This reversing gear is suitably geared 15
with the vehicle driving axle Il to cause move
hydrodynamic transmission in such a way by in- ' ment or travel of the vehicle, either in .a for
ward or backward direction, accordingly as the
creasing the motor speed that the torque in
creasessteadily so that the vehicle is brought reversing gear itself is shifted or primed for
20 smoothly and without any shock to a motion‘in taking power from the driven shaft I5 and trans 20
mitting such power to the axle I1 with a forward
‘ forward direction.
A vehicle equipped with a hydrodynamic trans ` _ driving effect cr a backward ‘driving effect. The
mission when running up a grade can, therefore, speciiic reversing gear transmission means is not important, for many diiîerent speciiic clutch
be' stopped by only reducing the motor speed ac
25 cordingly and can be kept stopped without apply
mechanisms are known or can readily be devised
coma the force moving the vehicle backwards.
`It is furthermore possible to manœuvre .with the
I«ing the brakes by adjusting lthe >motor speed so for converting the power of the driven shaft I5
that the vehicle will be maintained in this state into iorward‘or backward propulsion of the ve~
for any`length of time land it can be started again
by simply accelerating the motor speed. When
The hydrodynamic transmission is indicated
30 running downhill it is possible to check the speed
generally at I8 and is represented as comprising
ofthe vehicle without lany aid of the brakes by a iiow coupling I! in combination with a torque
simply engaging the >reverse- gear. Then the changer 2li. Theprimary wheels a and a’ of the
secondary partof the hydrodynamic transmission coupling and torque changer respectively are at
is driven'through the 'reversing gear from the tached to the driving shaft Il; and the secondary y
35 drive 'wheels in reversed direction,l the primary ` wheels b and-b' of these respective parts are con 35
part is driven forward by the engine and the ' nected together to~provide a common rotary ele
speed of the latter is so adjusted that the desired f ment 2l one end _2I’ of which is attached to the
driven shaft I5.
maximum speed of the vehicle is not exceeded.
Working liquid is passed under pressure from
Our invention is illustrated by way of example
in the accompanying drawing, wherein similar tank -22 into _the chamber of primary wheel a
characters of reference indicate corresponding through suitable passages as 2l. Liquid is dis
parts throughout the several views, and in which: ' charged from the chamber of this wheel through
_ Figure 1 is a broken and part sectional side
an outlet opening 24.
elevational view, more pr less diagrammatical in
character, showing a vehicle embodying our in
To the chamber in the torque changer, liquid
is admitted through an opening 25. 'I'he out
let for the discharge of liquid from the torque
Fig. 2 is a similar view showing a vehicle
equipped with.two operating units, each consist
Ling of a motor, a hydrodynamic turbo
50 mission and reversing gear;
trans- `
Fig. 3 is a top plan view of one unit; and
Fig. 4 is a broken elevation and section of the
hydrodynamic turbo transmission.
changer chamber 'is indicated at 26.
By suitable means which may consist of an
operating valve 21, liquid maybe shut oil from
the torque changer 20 at the same time liquid is
permitted to enter the coupling I8, and these
operations result'in emptying the torque changer
and, illling the coupling whereby slightly to .de
The invention relates to the equipment of a
crease torque .transmission'by the'torque changer
vehicle and to the method of operation of the
and to slightly increase torque transmission by
the couplinîg'. There is of course continuous dis
charge from and flow into the torque changer or
Y 4
the coupling whichever is in operation.
When either the coupling, I9 di' the torque
changer 20 is engaged, that is to say, when their
respective working circuits are ñlledj. the motor is
mechanically independent of the driven shaft I5
which is connected throughy the reversing gear
s apparatusjwith the driving axle I1 of the> ve
means of reversing gear can beecoupled?to the
drive wheels in order to obtain the forward and
backward motion the method of operation on a
long downhill grade will
as follows:
One engine is ¿set for driving vin forward direc
tion, the other îfor backward direction. When
one engine is used for the forward direction, the
other engine which is used for backward direc
î'tion idles so as to be constantly available for brak
10 hicle.
Due to thisarrangement the motor may ïing operation, although if desired this` other 10
in operation for driving the vehicle in e. for ïengine may be stopped. With the forward engine
werd direction while the vehicle itself may be ` the vehicle is brought to the desired speed, then
permitted to travel -in the opposite or'backward this engine is stopped or set to idling while in
direction. 'y To accomplish this result the ìnotor stead of braking the speed is controlled by ac
15 speed must be reduced te such eiitent that the fcelerating or decelerating the second engine, as 15
torque developed by theíhydrodynamic trans
?the case may be. If the grade is interrupted by
mission will be irisuñlcient to overcome the -op
plane er uphill parts, where a speed loss would
posite torque deve'îfîoped bythe force which causes ¿,occur, the first engine can be taken for accelerat
or tends
cause'ba'ckward `travel of the vehicle. ïë ing again.
20 Pgnother advantage of this arrangement is that '
Thismethod of operation has the great ad
the travel of the .vehicle may be changed @from a î vantage that the full engine power is available
l‘leckwardY direction to a forward ¿direction in an e for braking purposes and that braking is at the
easy smooth manner and without shock or sudden e same time very intense but-smooth andthat no
jolt. 'I'his maneuver canïbe accomplished by in YVwear of mechanical parts but only heating of the
25 creasing the motor speedf to an extent suiiicient » working liquideof the turbo transmission occurs. 25
to overcome the force that causes or tends to The tlrus generated heat can easily be dissipated
cause backward travel of the vehicle.
by cooîers of known type.
l With this hydlîodynamic transmission, the ve- i?
If reversing mechanisms engageabie during
30 V‘without
hicle may
be stopped
by properly
on a grade
ad- " opera'tionuare provided, it is possible te also use
all engines either for driving or' braking;
Éusting the motor speed to the backward? rolling
force. The vehicle can again be started up-ágrade
by accelerating the motor speed. It `will vbe
vrealized that while theciïfehicle is running down
35 grade, its speed may be checked without the aid
of brakes, simply by shifting the reversing gear
into reverse. Through this operation the second
ary par?l of the hydrodynamic transmission will
be driven through the reversing gear_ from lthe
driving axle in` reversed direction, while the
primary part is driven forward by the motor, the
speed of which is adjusted to permit movement
of the vehicle at the rate desired.
r«If a vehicle is equipped with two engines and
45 two hydrodynamic turbo transmissions which by
We claim:
The method of controlling the speed of travel
of a land „vehicle having at least two pairs of
wheels which comprises, applying an elastic and
yielding torque to one pair of wheels tending to 35
drive the vehicle in one direction, applying en
\ elastic and yielding torque to the other pair of
wheels tending to drive the vehicle in the op
posite direction, and controlling the extent of the
two elastic and yielding opposing torques where 40
by the vehicle may be caused to accelerate and Y
decelerate in either direction of motion.
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