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Патент USA US2117340

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May 17, î938„ l
A .
Filed May 29. 193e -'
2 sheets-sheet 1'
May 17, 1938.
2 Sheets-Sheet 2
Filed May ze. 195e
Patented May 17, 1938`
_Umrau sTATES2,111.34»PATENT l. oFFlcE
Albrecht Maurer, Bad Homburg v. d. Hohe, Gcr»
many, assignor to Firm P._ I. V. Ketten' und ‘
Getriebe G. m. b. H., Bad Homburg v. d. Hohe, -
Germany, _a corporation o! Germany
Application May 2s, n1931s, sel-mino. 82,415
In Germany Jnneß, 1935
.4 Claims.
This invention relates to continuously variable
change speed gears comprising a compensating
gearing, including aplanet system- which is con
nectedwlth the driving shaft. The device of the
5 invention includes two sun wheels so arranged
herewith `a connectionbetween the two power
branches of the transmission is provided which
controls the 4speed 'of revolution of _the two
branches' and in this manner a different" speed
of rotation _of the power take-oir shaft is always 5
that both sun wheels are, driven at variable ._ insured. -It is possible on the one hand to reg
speeds. Particularly the two sun wheels can be ulate the speed of the power` take-olf shaft
driven in opposite directions. Thus, it is 90s
through zero symmetrically on both sides of ad
siple to regulate the speed of the driving shaft' justment by‘ means of the continuously variable
absolutely symmetricallyI in both directions of
regulating gear which may be a speed range on )0
rotation and to carry out this regulation with one side, for instance of 1:4. The power which
very great accuracy especially near the stopping _ can be. transmitted at extreme speeds of rotation
position .
is »approximately twice as great _as that which
The two sun wheels can each be driven by av could be transmitted 4with the same load on the
shaft of a stepless change gear. For example a regulating gear~ where only a single differential [5
chain gear with two adjustable pairs of conicalV gear isv used. For this reason'the structureof.
discs -and- chain links.._running therebetween may A the present invention embodies the two ‘differenf
be used as such a stepless change gear. If‘ the ’tial gears shown and described in greater de
driving _motor only drives one of the shafts of tail below.
o _the change gear, then during the adjustment.
from the maximum speed in one direction tothe '
' maximum speed in the other direction the turn- .
0n the‘other hand> the device of the present 20V
invention permits regulation from zero to a max
speed of rotation. 'I'he power at the power A
ing moment on the -driving lshaft of the gear take-off
or output drive shaft for maximum speed
changes corresponding to the varying diameter of
rotation/is approximately one. and one-half
of the circularl path of the chain in proportion to
times the power transmitted in the actìlal vreg- 25
the root of the regulating rangel of the gear. ._ ulating gear, which in turn is- exactly double.
'I'his objection can be overcome by driving the that transmitted by regulating gears heretofore ‘
two shafts of the change gear simultaneously known having only a single diñerential at _the
from a 'common source of power through thein
termediary _of a compensating gear
This pre
sents the further advantage that it is possible
to transmit about double the eiliciency than that
`which is possible when driving only one shaftl
without altering_the size _of the change speed
. gear and that the'driving speed in both direc
tions 'of rotation is regulated absolutely sym
metrically to the zero position of the regulating
As willbe understood from the drawings, >the
device of the present invention comprises a
. change-speed gear characterized by the fact that
the output drive shafts are driven through a dif
ferential gear, the sun wheels of which are driven
with variable speeds, and the sun wheels of the
diiferential gear are each driven by one of` the
shafts ofthe continuously variable change-speed '
gear, which shafts are. in turn simultaneously
driven by a common source of power’ through a
second diiïerential gear. -
While many forms of change-speed `Agearing
v may be used, one suitable form 'which is illus
highest speed oi' rotation.. The device of the>
present invention, therefore, permits a substan-- 30
tial'reduction inthe size of the regulating gear
necessary for a predetermined maximum power
output or, conversely, Vpermits of a considerably - i
greater power output- being transmitted `with a y
given regulating gear.
'The invention is diagrammatically illustrated
'in the accompanying drawings in whichz-
" ,
Fig. 1 is a diagrammaticv view showing the form
of construction.
Flg. 2 >is a longitudinal section through such 40
a gear, only the-two shafts Aof .the known step`>
less change‘ conical disc gear are Ashown.~
Referring to Figure 1, a motor 3 drives the
planet wheel carrier 4i ora differential gear.
'I_'he -planet wheels 46 onthe planet wheel '.car- $5 '
rier mesh with two sun wheels 41 fand Il_which
are loosely mounted on the driving shaft 2 0i' .
the motor._„ The sun wheel 41 drives by a ring
_of teeth I9 a toothed wheel' SIIV which is keyed
on a shaft 51 or a variable. speed chain belt gear 50.'
52 comprising two pairs of cone discs 80 and Il
I trated herewith comprises two adjustable pairs oil'` and
a driving chain belt 82. The sun' wheel
conical discs with a drive element Such as a.
“fdrives through a ring of teeth 53 a toothed.
chain link belt running between'thcm. " _
`_In» the particular form` of the device shown ‘ wheel i4 keyed on a second shaft 55 of the vari
"able speedl gear 52. The two shafts 5| andïl! I6__.
2 ,
- drive through bevel wheels 56 and 51/’the two sun
wheels 58 and 59 of another differential gear,
the planet wheels 6| of which are mounted on a
bination a compensating sun and planet wheel
gear, a driving shaft connected to the planet
system of said gear, a stepless variable gear hav
spindle 60' keyed onfshaft 21. "The sum of the ing two shafts, each shaft adapted to drive one
numbers- of revolutions of the two shafts 5| and ‘ of the two sun wheels of said gear, a compensat
55 is determined by the running speed ofthe ing .gear connected with both said last mentioned
motor 3. On-the other hand, by adjusting the shafts and a common source of power adapted to
variable speed gear 52 by means of a regulating drive both of said last mentioned shafts through
device 19, the ratio of the numbers vof revolutions the intermediary of said compensating gear.
2. A continuously variable change speed gear
of the shafts 5| and 55 can be changed so that
the drive output shaft 21 can be adjusted to any including a power source, an output shaft, a dif
speed in both directions of rotation. '
In the form of construction shown in longi
ferential gear interposed between the two, a l
planetary gear system having sun wheels, means
tudinal section in Figure 2, the electric motor 3 for driving said sun wheels‘at variable speeds
is fixed on the gear casing I4. On the shaft 2 of .by said driving means, the change speed Gear
_ this motor a disc 6| is keyed which forms part characterized by the fact that the two sun wheels
of the planet wheel carrier o_f a differential gear, of the differential _gear are each driven by one
the planet wheels of which are toothed Wheels, of the shafts of a continuously variable change
the shafts of which run in ball bearings 66 and
61 in ring discs 68 and 59. The ringv discs are
connected by a cylindrical wall 15 with the disc
6| which has arms 63 extending outwardly be
tween the planet wheels. The planet wheels 62
mounted on shafts 64 mesh with a ring of teeth
1| mounted on a hub 12 which runs -in ball bear
ings 13 on the shaft 2. The hub 12 carries a
toothed wheel „which drives a. change speed
gear 52 through the intermediary .of a toothed
wheel 50 on one of the shafts 5|. Correspond
ingly a second set of planet wheels (not shown)
mesh with a ring of teeth 14 on> a. hub 15 which
runs in ball bearings 15 on the shaft 2. The hub
15 can-ies a toothed wheel 53 which drives the
second shaft 55 of the change speedv gear 52
' through a toothed wheel 54.
The two sun wheels'of a second differential
gea-r are driven by the shafts 5| and 55, this gear
corresponding. in its construction and operation
to the differential gear which connects the shaft
2 to the shafts 5| and 55, and theplanet wheel
carrier is connected with the output drive Shaft
21. The shaft 5| drives the one 'sun wheel ||
having a ring of teeth I6 in the same direction
by means of a chain belt drive 11‘, whereas the- shaft 55 drives the other sun wheel |0 having
speed regulating gear, and that said shafts are in
turn simultaneously 'driven by a common source 20
of power through a second differential gear.
_ 3. A continuously variable change speed gear. -
including a> power source, a power output shaft,
,a continuously l variable change speed gearing
interposed between the two and comprising pairs 25
of conical discs mounted on shafts to be moved
toward and from each other, and a flexible driv
ing element in contact with said discs, a differen
tial gear interposed between said power source
and said change speed gearing, a second dif 30
ferential interposed between;\said change speed
gearing and said power- output shaft, said dif
ferential gears including sun wheels, the mech- '
anism characterized by the -fact that the two
sun wheels of the differential gear are each
driven by a separate moving partiof _the con
tinuously variable change speed gearing, which
parts are in turn simultaneously driven by the
common power source through one lof the dif-v
ferential gears.
4. A continuously variable change speed gear,
including a power source, va power output shaft,
a continuously variable change speed gearing in
terposed between the _two and comprising pairs
of conical discs mounted on shafts to be moved
the ringof teeth I5 in the opposite direction by ` toward -and from each other, anda flexible driv
means of a toothed wheel drive 18. The ring of ing element in contact with said discs, a differen
teeth |5 meshes with toothed planet wheels l'l, tial gear interposed betweensaid power source
the shafts .I8 of which are journalled by means -and said change speed gearing, a second dif 60
of ball bearings I9 and 20 in two rings discs 2| `ferential interposed between said change speed
_and 22. In a similar manner the ring of teeth gearing and said power output shaft,v said dif
I6 meshes with other planet wheels (not shown) ferential gears including'sun wheels, the mech
_the shafts of which are also journalled in the anism characterized by the fact that the two Sun
two ring discs 2| and 22 and each of which also wheels of the differential gear are each driven
' by a separate shafty of the continuously variable
55 meshes withone of the planet wheels |1.
change speed gearing, which shafts> are in turn
Having now particularly described and ascer
tained the nature of the said invention and inv simultaneously driven by the common power
what manner- the‘same is to be performed,'I source through one of the differential gears.
-declare that what I claixnisz
1. A stepless change gear, comprising iny com
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