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Патент USA US2410915

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Nov. 12, 1946“.
Filed Jan. 19;,» 1944_
2 Sheets-Sheet 1
Fig. 1
Herbert J Wi/lmott
" {BXM Attorney \
NW» 12,1'945-
2,410,915 "
Filed Jan. '19, 1944
ZSheets-Sheet z '
Fig@_ 2
A52} -
I i?wemm’
Herbert J. W///m0tt
, B8 Aorney
Patented m2, 194s "
", ' 310,915
. 2,410,915
' navnasmm AND VARIAliLE-SPEED
Herbert J. Wilimott, Beverly, Masa, assignor to ‘
‘ United'Shoe Machinery Corporation, Fleming
. ton, N. J ., a corporation of New Jersey
Application January 19, 1944,-Serial No. 518,893 I
7 Claims. (Cl. 74-286)
This invention relates to improvements in re
versible and variable speed differential mecha-._
nisms for transmitting power.
, _
' two power output shafts are provided and which
may be driven'independently of each other.
In the simplest form a split housing ill is
The transmission herein disclosed may have a
utilized,‘ to. the outside of which is attached a
motor l2. Within the housing It) a gear .train
broad ?eld of utility, being readily adaptable for
the driving of boats, land vehicles or machine
tools orfor manipulating
in azimuth and
consisting of meshed spur gears l4 and iii are
suitably journaled in bearings generally indicated '
by the numerals I8, 20, and 22. The diameters
of gears l4 and It may be made equal. The
It is an object of this invention to provide an
improved and simpli?ed mechanism by which 10 armature of the motor I2 is‘ arranged to drive
motive power from a member rotating in one 61- ‘
rection may be transmitted to a power. output
member to rotate it either in the ‘same direction
as the ?rst-named member or in‘ the opposite
direction and at a selected speed, both direction 15
and speed beingv determined by the positioning
of a lever member biased to a predetermined po
A further object is to provide an improved '
the gear I 4 by means of‘a suitable coupling 24.
Integral with the gear I4 is a shaft 26 which
extends outside .of the gear housing. on the end
of the shaft 26 are keyedthe'two halves 28 and
30 of a V-type variable diameter pulley. The
pulley half 28 is rigidly fastened to the shaft 26
bya screw- 32 and keys 34 and 36. The other half
38 of the pulley is axially slidable on the shaft ‘
28 but is not rotatable thereon because of keys
mechanism by which motive power from a mem 20 34 and 35. The axially slidable portion 30 of the
ber rotating in one direction may be transmitted
pulley has a hub upon which an annular ring 38
independently to either one or both of two power
is held and retained by a ball bearing arrange
output members to rotate one or both of them
ment as shown." The ring 38 has pins 40 extend
either in the same direction as the ?rst-named
ing from both sides thereof, only one pin 40 being
member or in' the opposite direction and at con 25 shown. The gear i6 is integral with a ‘sleeve 42
trolled and variable speeds.
suitably journaled in the bearing 20, and an in
To this end, and in accordance with an im
ternal annular bevel gear 44 is formed on the
_ portant feature of the invention, there is pro
vided a novel power transmission in which the
" vgear l6. Coaxial with the gear 16 and'sleeve 42
is mounted a bevel gear 46 having integral there
with a sleeve 48 joumaled in the bearing 22. The
sleeve ‘48 extends outside of the gear housing 10, _
and pulley halves 50 and 52 similar to the pulley
direction through a zero position by the use of ’
halves 28 and 30 are mounted on the sleeves
a single differential gear drive and a control lever
Pulley half. 52 is also provided with an annular
biased to a predetermined position.
. 35 ring 54 similar to the annular ring 38 and is ‘also
A further feature of the invention comprises provided with pins 58 similar to the pins 40. Pul
novel structure in which power from a single
ley halfill is rigidly attached to the sleeve 48 by _
source is divided and transmitted to both'sides
means of set screws iii. A shaft 58 extends en
of each of two, differential power units, one side
tirely through the sleeves 42 and 48 and also
of each unit being connected by a variable speed 40 through the pulley halves 50 and 52 for power out
drive to one side of the other unit, the other sides
put purposes at either end. Between the coaxial
of the units being geared together, and the two
gears l6 and 46 a spider 60 is affixed to the shaft 58
sides of each unit being arranged toy drive through ‘ having pinion gears 62 and 64 mounted thereon ~
pinion gearing a spider or arm amxed to a power
for rotation. The annular bevel gear 44, taken to
output shaft to rotate that shaft at a speed and pk5 gether withthe spider 60 and pinion gears 82 and
in a direction determined by the setting of one
84 may be taken to constitute a differential gear
rotation of a constantly driven power input shaft
may be imparted to a power output shaft at vary
ing rates of speed up to a maximum rate in either
of the variable speed drives.
The invention may be more fully understood
from the following description taken‘ together
with the accompanying drawings, in which
Fig. 1 shows a view, partly in section, of one
embodiment of the invention having a single
power output shaft; and
ing means. A bracket 66~is mounted on the. gear,
housing ill by means of bolts 88. Atv one end of
the bracket 68 is a bearing member 18 upon which
is pivoted a control lever 12 having yoke arms 14
and 16 as well as a short finger 18. The two yoke
arms 14 as well as the two yoke arms 16 are pro
vided with slots to accommodate the pins 40 and
f Fig. 2 shows a similar view, partly in section,
“respectively. The bracket 66 is also provided
of a second embodiment of the invention in which 55 with spring retaining means 80 and 82 of identi
cal structure. Spring retaining means 80 is de- .
picted fully and a compression spring 84 is shown
with a screw head 86 arranged to adiust the com
pression of the spring. A head 88 is mounted for
vertical motion within the member 80 and en
Gear I06 is provided with an internal bevel gear
I40 and the pinion gears I36 and I38 are mounted
‘ in engagement with annular bevel gear I40 ‘and
the bevel gear.I20. The shaft I32 is provided‘
with a spider I42 rigidly a?ixed thereto. Gear
I08 has an annular bevel. gear I44, and pinion
closes one end of the spring 84. The frame mem
ber 68 has a stop or protuberance '80 serving to,
limit the upward motion of head 88.‘ A 'V-type ,
belt 3i connects the pulleys.
for engagement between the bevel gear I24 and
gether with the bevel gear 46 to rotate in a
direction opposite to the direction of rotation of
the gear I6. If the gears I4 and I6 are of the
va-type split pulleyarrangements I52, I84 and
I56, respectively.- Two ‘control levers I58 and
I60, together with spring biased centering de
58 will not rotate because of the differential ac
will be rotated in one direction and because of '
gears I46 and I48 are‘ mounted on the spider I42
the annular bevel gear I44. The outer e?d of
From the above description it will be seen that 10 sleeve I22 is provided with a V-type split pulley
I50 which is similar to the arrangement used
gears I4 and I6 are driven in opposite directions
on the outer end of sleeve 48 in Fig. 1. The‘
by the motor I2 and that the V-belt connection
sleeves II4, I26 and H0 are provided with similar
between the pulleys will cause the sleeve 48 to
vices are mounted on the gear casing by means
ratio of one-to-one they will rotate at equal
of brackets I62 and I64‘and each is in all respects
speeds but in opposite directions. When the ef
similar to the control lever ‘I2 arrangement in
fective diameters of the pulleys forming the vari
able drive unit are the same, the shaft 26 and 20 Fig. 1. Belts I66 and I68 are placed upon the
opposed pulleys.
the sleeve 48 will be rotated at equal speeds and
It will be seen from the above description, that
in the same direction. Assuming that the above
the operation of each power output shaft is the
conditions exist, gears I6 and 46 will rotate in
same as the operation of the power output shaft
opposite directions and at equal speeds and hence
the spider 60 and consequently the output shaft 25 58 in Fig. 1. To drive the shaft I30, gear I08
the gear and pulley arrangement the bevel gear
tion of pinion gears 62 and 64. If the relative
I20 will be rotated in the reverse direction at a
effective diameters of the pulleys are varied by
rate of speed dependent upon the manipulation
changing the position of the control lever ‘I2 the
balanced condition of the differential will be dis 30 or setting of lever I58. If the gears I06 and I20
are rotated in opposite directions and at the same
turbed and rotation of the output shaft 58 will
rate the shaft I30 will not be rotated because
occur, the speed and direction of said rotation '
of the differential action, 1. e. pinion gears I38
being dependent upon the relative speeds of the
and I38 will rotate on the spider I34 without
members forming the other elements of the dif
rotation to the spider. If the lever
ferential and the position of the control lever ‘I2.
I58 be moved to the right, as viewed in Fig. 2,
Thus, it will be understood that by appropriate
the effective diameter of pulley I52 will be de
adjustment or movement of the lever 12, shaft
creased and the effective diameter of the pulley
58 may be caused to rotate in either direction
I50 will be increased with the result that bevel
and at any speed between zero and a maximum,
which is determined by the speed of rotation 40 gear I20 will rotate at a lower rate of speed,
causing the spider I34 and the shaft I30 to
of the motor I2. Release of lever ‘I2 will cause
rotate in one direction at a corresponding speed.
a centering of lever ‘I2 by action of the springs
If the control lever I58 be moved to the left, the
upon the short ?nger ‘I8. The centered or pre
effective ratio of pulley diameters will again be
determined position of lever ‘I2 may be chosen
to give non-rotation of the shaft 58 or some 45 changed to cause rotation of shaft I30 in the
opposite direction. As stated with respect to the
definite speed and direction of rotation of that
device‘ of Fig. 1, the centering position, of lever
‘I58 may be so arranged as to give non-rotation
It is to be understood that the motor l2 can
the shaft I30.
be connected up to drive the gear I6 instead of
The lever I60 may likewise be used to control
the gear I4 and that it could be mounted in
the relative speeds of rotation in opposite direc
‘positions other than as shown in Fig. 1 and
tions of the gears I08 and I24 to impart non
could drive either of gears I6 or I4 through in
rotation or a desired speed of rotation to spider
termediate gears forming a part of the gear train.
I42 and shaft I32 in either direction.
In Fig. 2 is shown an arrangement whereby
There are several advantages to both mecha
power is imparted from a single source of power
‘ nisms such as described. In the ?rst place it can
to two independently driven power output shafts.
be seen that the gear casing or housing arrange
A gear housing I00 is provided to which is at
ment does not give rise to any complicated lubri
tached a motor I02 arranged to drive a gear I04
cation problems regardless of which horizontal,
which in turn is arranged to drive a gear train
made up of spur gears I06 and I08. The gear 60 vertical or inclined position the shafts may be
mounted. The entire device (either modifica
I06 is provided with a sleeve IIO journaled in a
tion) is not complicated and each output shaft
bearing generally indicated by the character H2.
requires only one belt drive and one differential
The gear I08 has integral therewith a sleeve II4
gear drive ‘for a smooth, efficient and reliable
journaled in a bearing generally indicated by the
control which is biased to some predetermined
character I I6. Coaxially mounted in a bearing
condition. The arrangement is such that it is
II8 with the gear I06 is a separate bevel gear
compact and can be. installed where space is at
I20 having an integral sleeve I22. In alinement
a premium. It is to be noted that the gear hous
with the gear I08 and sleeve I I4 a separate bevel
ing and arrangement of power‘supply can be
gear I24 is supported on a sleeve I26 within a
varied in numerous ways without altering the
bearing I28. A power output shaft I30 is mount
principle of operation and be adaptable to sit- ed for free rotation within the two sleeves H0
and I22. A second power output shaft I32 is , uations in which the available space for installaé
tion of the transmission is of a particular con
freely rotatable within the sleeves II4 and I28.
Attached rigidly to the shaft I30 is a spider I34
having gear plnions I36 and I38 mounted thereon. 75 Having described the invention, what I claim
as new and desire in secure by Letters Patent of
the United States is:
1. A variable speed transmission including a
housing with motor attached thereto, a pair of
meshed gears coupled to said motor, a bevel gear
coaxial with one of the meshed gears, the said
three gears being journaled within the housing,
a V-type variable diameter pulley speed drive di
rectly connecting the other of said meshed gears
between the coaxial gears of each pair for driving
its associated power output member, and means
for controlling the relative diameters of the
5. A variable speed transmission including a
housing, a pair of power driven meshed gears, a
- sleeve ‘and a bevel gear attached to the sleeve
being journaled in a position coaxial with each
vof the meshed gears and all four gears being
with a sleeve attached to said bevel gear, the ar 10 journaled within the housing, a variable speed
rangement being such that the coaxial gears are
drive connecting each of said meshed gears with
adapted to be rotated in opposite directions, a
the sleeve of the bevel gear which is coaxial with '
power output shaft journaled in the housing and
the other one of said meshed gears, the arrange
in' the sleeve, differential gearing means includ
' mentbeing such that the coaxial gears are ro- '
ing a spider and an annular bevel gear on the 15 tated in opposite directions, a power output shaft
one of the meshed gears mounted between the
joumaled in each sleeve, and ‘differential gear
coaxial gears for driving the said power output
ing means mounted between the coaxial gears
shaft, and a single controller lever for the var—
for driving the said power output shafts.
iable speed drive biased to a desired setting for
6. A variable speed transmission including a
the variable speed'drive.
~20 housing, a pair of power driven meshed gears
' 2. A power transmission including a gear train, .
a bevel gear coaxial with each one of two gears
of the gear train, a variable speed drive to trans- '
mit rotation from a gear in the said gear train
each having an annular bevel gear attached
thereto, a separate bevel gear coaxial with each
of the meshed gears and all the gears being jour
naled within the housing, a variable speed drive
to each bevel gear, the arrangement being such 25 connecting each of said meshed gears with the
that power operation of the gear train will im
part opposite directional rotation to the coaxial .
gears, a power output member associated with
each bevel gear, and differential gearing means
separate bevel gear which is coaxial with the
other one/of said meshed ‘gears, the arrangement
being such‘ that the coaxial gears are rotated in
opposite directions’, a power output shaft for each
mounted between the‘ coaxial gears for. driving 30 separate bevel gear with a spider attached there
the said power output members.
to, and differential pinion gearslmounted on the
3. A variable speed transmission including a
spiders for engagement with and between the co
housing, a pair of power driven meshed gears each
axial gears for driving the said power output
having a bevel gear mounted coaxially therewith, '
all said four gears being journaled within the. 35
7.. A variable speed transmission including a
housing, a variable speed drive connecting each
housing, a power driven gear train having at
of said meshed gears with the bevel gear coaxial
tached to. each of two of its gears an annular
with the other one of said meshed gears, the ar
bevel gear said two gears being mounted on sleeves
rangement being such that the coaxial gears are
for rotation within the housing, a separate bevel
rotated in opposite directions, a power output 40 gear coaxial with each of the said two gears and
shaft for each bevel gear, and differential gear
being mounted on sleeves for rotation within the
ing means mounted between the coaxial gears for
housing, a V-type variable diameter pulley drive
driving the said power output shafts.
connecting each of said two gears with the sepa-.
4; A power transmission including a gear train,
rate bevel gear which is coaxial. with the other
a bevel gear coaxial with each one of two gears 45 one of said two gears, the arrangement being
‘of the gear train to constitute two pairs of co
such that thecoaxial gears are rotated in oppo
axially mounted gears, a v-type variable diam
site directions, a power output shaft for eachv
eter pulley drive to transmit rotation from a gear
separate bevel gear and passing through its sleeve,
in the said gear train to each bevel gear, the
differential gearing means mounted between co
arrangement being such that power operation of 6.0 axial gears for driving the said power output
the gear train will impart opposite directional
shafts, and means for controlling the relative
rotation to the coaxially mounted gears of each
diameters of the pulleys.
‘pair, a power output member associated with each
bevel gear, di?erential gearing means mounted
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