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Oct. 29, 1946.
2,410,137 _
Filed July 19; 1944
6 Sheets-Sheet 1
‘Oct. 29, 1946.
G, wALLAc-H '
Filed July 19, 1944
6 Sheets-Sheet 2
Oct. 29, 1946.
6 Sheets-Sheet 3
Filed July 19, 1944
650/?“ M14 mcH,
B}! Q
,wOét.‘ 29, 1946.
Filed July 19, 1944
6 Sheets-Sheet 4
Oct. .29, 1946.
Filed July 19, 1944
s Sheets-Shéet s
Oct. 29, 1946.
G, wALLAcl-l
Filed July 19, 1944
‘ e SheetS-VSheet‘G
650/?65 W4 L-LACH,
Patented Oct. 29, 1946
George Wallach, Chapman Camp, British Colum
bia, Canada
Application July 19, 1944, Serial No. 545,693
6 Claims.
(01. 192—61) _
_ tion is to provide a transmission of the above
This invention relates generally to power
transmission apparatus, and an important object
of the present invention is to provide, in an ap
paratus of the above kind, an improved planetary
type of variable speed hydraulic transmission.
Another important object of the present in
character, wherein the transmission housing is
divided by a partition into a pump chamber and
an oil supply chamber, and wherein float valves
are provided for controlling the flow of oil from
-the oil supply chamber to the pump chamber
so as to maintain a predetermined quantity of
vention is to provide, in an apparatus of the
oil in said pump chamber.
above kind, a variable speed transmission for for
A still further object of the present invention
ward speeds, and an improved combined differ
ential and reversing gearing for transmitting 10 is to provide a transmission of the above kind
which is comparatively simple, compact and
power from the driven shaft of the transmission
durable in construction, and so constituted as to
to the rear aligned transverse axle sections of a
insure continued e?icient operation.
motor vehicle, whereby reverse drive of the vehi
Further objects of the invention will become
cle may be effectd in a simple manner and with
from the following description when
out incorporating the reverse drive in the trans 15 considered in connection with the accompanying
mission. This is particularly useful when a hy
drawings, and the invention consists'in the novel
draulic transmission is employed, as in the pres
form, combination and arrangement of parts
ent invention, permitting simpli?cation of the
hereinafter more fully described, shown in the
A more specific object of the present invention 20 drawings
wherein like reference char
is to provide an improved hydraulic transmis
acters indicate corresponding parts throughout
sion of the above kind wherein the sun gear is
?xed on the driven shaft, wherein a pair of gear
the several views-—
pumps is provided in the transmission casing with
one gear of each pump meshing with the sun
‘ driving apparatus for a motor vehicle embodying
gear and constituting a planet gear movable with
the transmission casingin an orbital path about
a transmission and a combined differential and
reversing gearing constructed in accordance with
the sun gear, the pump gears being carried by
the present invention.
axes parallel with the driven and driving shafts .
and ?xed to the transmission casing, the transmission casing being ?xed on the driving shaft,
and manually operable means being provided
Figure 1 is a fragmentary side elevational view,
partly broken away and partly in section, of a
Figure ‘2 is an enlarged transverse section
taken substantially on line 2-2 of Figure l and
showing the transmission in~front elevation.
Figure 3 is a vertical longitudinal section taken
for controlling the ?ow of oil to the gear pumps
on line 3,-—3 of Figure 2.
for varying the stalling action on or resistance
Figure 4 is a transverse section taken on line
to rotation of the pump gears. Thus, if the
4-4 of Figure 3.
pump gears are allowed to rotate freely about
Figure 5 is a transverse section takenv on line
their axes as they revolve with the transmission
5—-5 of Figure 3.v
housing about the sun gear, no power is trans
Figure 6 is a transverse section taken on line
mitted from the driving to the driven shaft. On
of Figure 3. >
the other hand, if resistance is offered to rotation 40 6-6
Figure 7 is a fragmentary section taken on line
of the pump gears by causing them to pump oil '
1-1 of Figure 6. ' '
in circuits within the transmission housing, pow
Figure 8 is a perspective viewof one of the
er will be transmitted from the driving shaft to
gates for controlling'the ?ow of oil through the
the driven shaft, and the amount of resistance to
pumps, together with its actuating arm.
rotation of the pump gears about their aXes 45
Figure 9 is a fragmentary perspective view
will determine the ratio of rotation between the
showing a portion of the rear cover plate of the
driving and driven shafts. ‘ Oil is supplied to the
transmission housing, and illustrating the man
pumps at the periphery of the housing and con
ner in which said cover ‘plate is provided with
trolled by manually operable gates which regu
late ?ow of the oil from the space between the 50 ?oat
Figure 10 is an enlarged perspective view of
pumps, thereby varying the amount of oil that
one of the ?oat valves.
must be handled by the pumps, and correspond
‘Figure 11 is a fragmentary View, partly di
ingly varying the resistance offered to the rota
agrammatic, illustrating the manner in, which
tion of the pump gears about their axes.
pump gate actuating pedal may be utilized
A further speci?c object of the present inven
to close the circuit of a solenoid for opening the
throttle valve of an engine carburetor so that
the engine may be operated with the throttle
wide open when the present transmission is in
be evenly distributed by centrifugal fo~ce in a
layer of considerable thickness at the inner pe
ripheral surface of the housing 7 within the outer
portions of the space 29. Swinging gates or gate
valves 33 are provided in the chamber H at the
Figure 12 is a fragmentary transverse section
taken on line 12-12 of Figure 1.
Figure 13 is a longitudinal section taken on
outer sides of the gears of each pump so as to
line I3-—! 3 of Figure 12.
Figure 14 is a top plan view of the construc
tion shown in Figure 12.
control the ?ow of oil to the pumps from the
space 29. As shown clearly in Figure 4, the gates
33 are closed by swinging them outwardly so as
10 to contact the peripheral wall of the housing 1
at their outer ends, while the gates 33 are opened
' Figure 15 is a fragmentary side elevational
by swinging them inwardly toward the adjacent
view showing the present transmission employed
pump gears as shown by dotted lines.
in the driving apparatus for stationary ma:
Obviously, if the gates 33 are closed, no oil
chinery, and
15 will be permitted to flow from the space 29 to
Figure 16 is a section taken substantially on
the pumps, and the pump gears ii and It‘ may
line Iii-46 of Figure 15.
rotate freely about their axes l9 so as to revolve
Referring in detail to the drawings, 5 indi
with the housing 1 and driving shaft 5 about
cates the motor or driving shaft and 6 the driven
the sun gear IS without driving the latter or
shaft, which shafts are operatively connected 20 the driven shaft 5. As the gates 33 are opened,
by means of a variable speed hydraulic trans
however, oil will be permitted to flow to the
‘mission constructed in accordance with the pres
pumps so that the latter will build up a pressure
ent invention. The transmission includes a cy
between the gears thereof that will act to stall
lindrical or circular housing 1 provided at its
or resist rotation of the pump gears about their
front end with’ an axial hub 8 keyed. on the 25 own axes 199. Naturally, upon the degree of
rear end of driving shaft 5, as at 9, and pro
opening of the gates 33 and the amount of stalling
vided with a transverse partition'lll that divides
imposed upon the pump gears will depend the
the interior of the housing into a front pump
ratio of speed between the driving and driven
chamber H and a rear oil supply chamber or
shafts 5 and
Slowing the speed of rotation
reservoir 12. The housing has a rear closure
of the pump gears about their axes l9 will cause
plate [3 formed with an internal cylindrical
power to be transmitted from shaft 5 to shaft
hub M in which is ?tted a bearing sleeve 15
6, the ratio of drive being dependent upon the
that receives the driven shaft 6. The front end
degree to which the pump gears are slowed in
of driven shaft 6 projects into the pump chamber
rotation about their axes I9. Theoretically, if
1 I and has a driven or sun gear l6 ?xed thereon.
Gear pumps .are provided within the chamber H
the pump gears are not permitted'to rotate at
all on their own axes, the driven shaft will be
driven at exactly the same speed as the driving
shaft. However, there will ‘be a limited amount
at opposite sides of the housing ‘I, each gear
pump including a 1pair of _intermeshing gears
or gear pistons I1 and I8 journaled on enlarged
of slippage due to the leakage of oil so that the
stem portions iii of stud bolts 20 ?xed in the 40 most practical attainment is to succeed in driving
front wall of the housing 1. The gear l8 of each
the driven shaft at about 95% of the speed of
pump is of larger diameter than the gear I1
the driving shaft. _It is well to point out at
thereof and meshes with the sun gear I6. The
this time that the action obtained herein is not
partition H3 is drawn by nuts on bolts 20 snugly
similar to that obtained by controlling the out
against the rear ends of the enlarged bolt por
put of a pump located within a stationary hous
tions #9 and also against an internal annular
ing. Instead, the action obtained in this inven
shoulder 2! provided in the housing 7. Bolts 20
tion is to vary the quantity of oil supplied to and
are extended through cover plate I37 and have
capable of being pumped by ‘the pumps, thereby‘
nuts 22 threaded thereon to secure said cover
controlling the amount of pressure that may be
plate in place. Fitted in the space between. and 50 built up between the gears of the ,puinpand
at the outer sides of the gears of each pump is a
consequently controlling the degree of stalling of
block 25 having faces 26 conforming to the con
tour of the gears l1 and i8 and lying closely ad
the pump gears or the degree of resistance proper
to rotation of the pump gears about their own
jacent thereto, outer arcuate surfaces of the
axes. More particularly, it should be borne in
blocks 25 contacting and conforming to the inner 55 mind that this is had in connection with gear
surface of the housing 1. The blocks are dow
pumps whose gears revolve with a rotary hous
eled and bolted in place, as indicated at 21 and
ing keyed on and rotating with the driving shaft.
28, respectively. A space 29 of appreciable size
Secured on and rotatable with the external
is thus left within the pump chamber H between
hub 8 of the housing 1 is the hub
of a spider
the pumps, which space is radially divided inter
having radial angular arms 35 whose outer ends
mediate the ‘pumps and at opposite sides of the
are directed rearwardly toward the housing ‘3
sun gear l6 by means of baffles 39. Thus, the
and are formed with rearwardly diverging in
pumps receive the oil at their outer sides or ad
clined slots 35, the opposed walls of which are
jacent the periphery of the housing "I and dis
grooved as indicated at 37 inFigures 4 and 6.
charge it in opposite directions into the space 29 65 Slidably received in the grooved or undercut slots
adjacent the sun gear It, as indicated by dotted
36 are ball members 38 provided on correspond
arrows. The baffles 30 carry rigid threaded studs
ing ends of actuating arms 131) secured on and
23 and 3! on their rear edges which also project
projecting laterally from the forward ends of
through the partition I!) and respectively have
pintles ill of the gates 33. ' The pintles 4! are
nuts 24 and 32 threaded thereon to secure the 70 journaled in bearingsllz of the housing 71, and
baffles in place.
the arms Ml have hubs 43 fitted on tapered ter
As the oil is maintained at a predetermined
minal portions of the pintles El and secured
pro-per level within the chamber H by a means
thereon by cap screws M (Figure 2). threaded in
that will be later described, and as the housing
axial threaded bores 65 (Figure 8) of the ‘pintles
1 rotates with the driving shaft 5, such oil will 75 4|.
The hub 34 of the spider is provided with
?ooding the pump chamber when the transmis~~
a thickened forward end having an annular
external groove 46 therein within which. is re
volubly positioned a shifting ring 41,; to opposite
sides of which is pivotedat 48 the vends of the,
arms'of a shifting fork 159 carried by a foot-pedal:
sion is'not in operation.
. _
In Figure 1, I have shown a driving apparatus
of .thekind 'employedin transmitting vpower from’
an‘ internal? combustion ~ engine to the rear axle
sections of a'jmotor vehicle, such apparatus-uti
lizing a-variablespeed transmission T constructed
50 and’pivoted'at its upper end,.1as at...5l, tora
suitable ?xed bracket 52. The arrangement'is
in accordance with
such that when the pedal 50 is depressed, shifting
the present invention and
also a‘combined differential and reverse gearing
'fork 49 is swung rearwardlyso as to‘ slide ‘the
T’inwhich is-also; constructed in accordance, with
spider rearwardly and cause the arms 49, through 10 the present invention, the gearing T’= serving to
the medium of balls 38; to follow the inclination
transmitjpower to the transversealigned rear
of slots 36. This causes swinging movement of.
axle sections ,‘Hand ‘Ila of the vehicle from‘ a
arms 4!) toward shaft 5 and swingingof gates
longitudinal propeller shaft 12 that is coupled
33 to open position. The'degree'of opening of
the driven lshaft‘? of:
by a universal ,j oint 13 with
gates 33, of course, depends upon the distance 15 thetransmission?T. The shaft ?w'isxshownl as
to which the pedal 50 is depressed, and the parts
are returned to normal position by spring 53
acting on lever 49 so as tonormally close the
supported vby a suitable bearing v"l4, mounted won
the underside of a transverse framemember 157
of 1, the a vehicle chassis.- ~.
gates 33. -In order to cause the spider 34, 35
- "As shownin Figures 1 and 12 to '14, massive;
to rotate with the housing 1, said spider is ‘pro 20 the‘ gearing T' is of conventional type andconr
vided at opposite sides with supplementalradial
struction except- that the ~ spider for 1 thefspider arms 54 having openings 55 in their outer ends
gearsof the differential carriesja second beveled;
which slidably receive guide pins 56 that are ?xed
ring gear 16 in addition to the conventionalbev
to and project forwardly from the front wall of
eled ring gear ‘16a, the ring gean'l?facing the
housing ‘l directly inwardly‘ of the bolts 28. The
ring gear 16a and» disposed _ t Vthe opposite side-of
grooves 31 are of segmento-spherical form ‘in
the: drivegpinion T! of propeller._;shaft 12 from
cross section so as to permit the'ball members
that at which the ._ordinary ring gear 16a} is dis}
posed. ; Thus,vwhen the pinionll is engagedwith
} gear l 16a, the rear axle sections'll ,and'l'lla'.
lit to assume different angular positions to which 30 ring;
they are moved by the shifting urine spider
will [be differentiallydriven in .one. direction,»
toward and from the housing].
whi1e,jif the pinion 11 is e
As shown clearly in Figures 3, 5, and 9, the
gear ‘l6, said rear axle sections ‘H and ‘Na will be.
39 to turn therein and thereby allow the arms
cover plate I3 is formed with; an inwardly pro-l
in a reversedirection.
openingsv?l. An L-shaped bracket 62 is "secured
housing of gearing T’.
In order to permit}
selective engagement of driving pinion. ‘H ‘with’
diametrically opposite points, as" at 58, and that 35 either desired one of ‘the ring'gears "and ‘1911,
the.“jlatterlgearsxare spaced apart, a. distance
is formed at ‘these points with inwardly prof
slightlylgreater. than3tl‘ie diameter of pinion 11,.
jecting, channel-shaped‘ ?oat chambers 59 prey
and propeller shaft ‘12 is mounted for limited lat
vided with rear walls 613 spaced from the adjaé
eralmovementvat its rear‘end with respect to-the.
cent closure plate l3“ and provided with inlet"
jecting annular ?ange 51"that is cutaway at
Thus, I the shaft ‘[2 > ex?‘
tendsthrough. an opening in the front of housing.
‘[8 that; is elongated horizontally for a suiiicient
to the inner, offset portion of wall 69 ,bviscrews
G3, or the like, and directly opposite‘ this _L-shaped;
bracket 62 the ?ange 51 is 'formedlwith an open};
distance-to permit the necessary lateral move-4
ment vof- shaft 12 3130 effect. the selective engage
ing 6L Loosely arranged ineachf?oatjchainber .‘
ment of pinion. 'Hvvitheither desired one_.of the
ringngeakrs: 16 'anldt'll?a. Means isprovided for
laterally swingingthe shaft 12 ‘to ‘effect-‘this op
eration, which means includes aplate pivoted
is a rectangular, ?oat 65 havingvya fulcrumwlug
68 at its rear end. engaged loosely in the
‘ adjacentv
opening 64 and carried by a bracket‘ 61 flired to
the adjacent end of the float, The ‘bracket 6-‘!
also carries a valve plugEB'“ arranged to seat‘, .50 at; its lower end, as at 80', to the front wall of
housing l'l8ifor lateral swinging movement in the
against the wall ??'about the‘opyéni'ng BI to’ nor
general plane of» the front wall ‘of housing 18.
mally close the latter. '
so, asuto.maintainconstant contact with said
tilted about the fulcrum lug 66 inwardly by means
ofarelativelypweak leaf v‘spring 69 attachedmto' . front wall.._..Thus,;by the provision .of suitable
the contiguous faces ‘of the
the outervwall, of 'the. float at asg’riear; end ‘ans; .55~i packing
plate 19, leakage of oil from the '
hearing, at itsforward end, "against the peripheral housing‘l818 and
may be prevented at the opening
‘waiver theh'ousing llfatlthe forward pa
12 projects into said housing 18.
the float chamber- The’ oil supply chamberlllti' ' Shaft" is. journaled
in a bearing at 80 carried
may "be ?lled with. oil thro'ughfa suitable filler '
wall of house. 60 by the plate 18 In‘ and'niovable between ?anges 82‘
opening provided in the'peripheral
ing 1‘ and normally closed byairemovablef
onl-the .front wall of housing-18, asshown in Fig
plug 10 (Figure.;5>. ‘The arrangement; is such
that, when the housing, ‘I is rotatedfth'e oiliwill
ure '13. At its upper edge, the plate 19.15 pro
‘surface of the housing 1." ,At' the.,start .oflthe
0peration,_the floats are moved outward by, ce'n'é
trifugal force, and by so doing, 'thejlvalve plugs
: on one_.end of a lever 85 and. pivoted at 86‘to
the front wall of housing 18. A bell crank lever
assume a layer adjacent. thev‘innerfperipheral
68 uncover, the openings 5!, permitting "oil'to new
from the supply chamber l2 tothegpumnpichamber
vided with arack 83, and meshing with the teeth
of this-rackis a mutilated spur pinion 84 provided
I}. As soon as the ‘quantity of pi; in the pump 7.0.
chamber reaches the desired mark,_the front ends
of the?oats move inwardly so asfto cause-‘the
plugs?S to close openings 6|. ,In; this way, the
quantity of- oil ‘in vthe pump,‘chamber'liswmain:g
.taiheq»cQn§tant-. ‘leaf springs??? {insure against.
81 is pivoted at 88 to-the vehicle frame at one
side of the shaft 12, and one arm of this bell
crank lever is connected by a rod 89 with the lever
85.. The other arm- of lever 81 may be con
nected by a rod. 99‘with a hand lever within
convenient reachilof the driver of ‘the motor
vehicle..,,The arrangement is: such that whenthe
rod 190; is pulled forwardly mutilated pinion‘v '84; is,
plate "in a direction to.‘
7,5 turned to.
drive pinion 11 to“ engage ring gear 16. On'the
.In' operation, the transmission housing ‘I ro~
other hand, when the rod 90 is moved r'ea'rwardly,
the lever 85 is swung in a direction to move drive
tates with the drive shaft 5 so that the oil in the
pump chamber H is thrown outwardly and dis
tributed in a uniform layer at the periphery of
the transmission housing within the space be
tween the pumps. With the transmission hous
in'g rotating, and the driven gear l6 stationary,
pinion 11 into mesh‘ with ring gear 16a, thereby
causing the rear axle section's ‘H and ‘II a to be
driveriin av reverse direction‘. It‘ will be appar'
ent that by this slight and practical modi?cation
of a conventional differential ‘gearing,- the neces
the planetary gears. 18 are caused to rotate, and
sity for incorporating reversingv mechanism in the
variable speed transmission‘ T is eliminated.‘ This?
they, in turn, rotate the cooperating pump gears
I? in a manner to pump oil inwardly toward the
center of the transmission housing. As no out
results in the production of a.’ variable’ speed
transmission of the hydraulic type which is’ of
let- is provided for oil thus pumped, except through
simpli?ed form and only required to provide dif
tolerances in mesh between each pair of pumping
gears, an oil pressure is built up, which oil pres
sure acts on the pump gears to restrain them
from rotating on their ‘respective axes. This
lends driving ability to the gears 18 instead of
ferent speeds of forward travel of’ the‘ vehicle;
When‘ a motorv vehicle is equipped with‘a variable
speed transmission constructed in accordance
with-thepresent invention, it’ is desirable to per‘
mit the internal combustion engine, which forms
just idling around the driven gear it. Thus, if
the power plant of the vehicle,- to operate with
resistance is offered to rotation of the driving
the throttle valve 9| of the e'rig'ir'ie carburetor 92 20. gears l8 by the oil pressure, and if such resistance
in fully open position whenever the transmission
should equal the torque on the driving gears pro
is brought into operation by opening movement
of gates 33. The throttle valve 9|, of course,
duced by the resistance of the driven gear to ro
tation, a one to one ratio between driving and
controls the admission of air through the air in
take 93v of the carburetor 92,'an‘d it has an oper
ating lever 94 which is connected‘ in- accordance
with the present invention with the’ core of a
solenoid 95. One side‘ of the coil of solenoid 95
is shown grounded as‘ 96, while the other side
driven gears would be the result. If, however, the
resistance to rotation of the driven gear increases,
the driving gears will rotate on their own axes
and at the same time will move aroundthe driven
gear to a variable extent, thus increasing the
ratio between the driving and drivenv gears. The
thereof is connected by a wire 91 with a- contact 30' increased speed of rotation of the driving gears
98 or a circuit maker and breaker.- The contact
98' is carried by the shifting lever or fork 49, and
on their own axes will result in oil being pumped
at a higher rate, thus tending to maintain the
is opposed to [another contact 99 ?xed‘ to a sta
necessary oil pressure to overcome the high re
tionary bracket Hill.’ The" arrangement is‘ such‘
sistance offered by‘ the driven gear. When the
higher oil pressure is not demanded, the reverse
that when‘ the pedal 50- is depressed, the contact
98 will be engaged with contact 99 so as to close
action takes place.
the circuit of the solenoid 9-5 and thereby cause
the latter to fully open the throttle'_ valve 9|
In order to drive the sun
' gear 16 on the driven shaft 6, the fork 49 is moved
to open the gates 33 to the’ desired extent, per~
when the gates 33' of the transmission T are
mitting the accumulated oil between the pumps to
swung toward- open position; As‘ shown,‘ a man 40 ?ow to the latter. Pressure is then built up be
ually operable switch I00 may be interposed ‘in
tween the gears of the pumps‘, the oil being dis
the wire'9'l for rendering the solenoid 95 oper
charged in a high pressure; jet-like stream from
ative or inoperative at‘ will, depending upon
between the pump gears adjacent the driven gear.
whether or not its-use" is desired. , Also, the’ con
When the pump gears receive a larger volume of
tact 99 is connected by a wire l0! toone- sneer‘
oil than is discharged by them, an oil pressure
a battery I02, whose other:v side is grounded at
I03. The circuit ofthe solenoid‘ 95 will be read‘
ily traced from this description.
between the pump gears is soon built up, caus
ing them to stall, to a varied extent on their re
spective axes. The extent of opening of gates
33 determines the amount of oilflow to the pump
gears. On the amount of oil ?ow ‘to the pump
In Figures‘ 15v and 16, I have shown" the present
variable speed transmission '_I' incorporated in:
the ,driv-ewfor static-nary, machinery. in this sort
of installation, the‘ driving" motor‘ymaywcohs‘ist
gears, the rapidity of oil discharge by the pumps
and thejresistance of the gear being driven, de
pends the degreeof ‘oil pressure built up between
of an electric motor‘ I94" having the“ housing ‘I of;
the transmission
Also; thesecured‘
‘driven shaft
on" the‘
the pump gears. Upon the degree of oil pressure
.’ ‘ built up between the pump gears, depends the
with‘ a suitable‘ coupling element Hi5, by means ‘
amount of stalling of the driving gears and the
shaft of the machinery which is‘tobe driven. In
will thus be seen that by properly adjusting the
of which said driven shaft may becoupledi pro/the‘
this sort of installation, the shifti gj fork'?saf
is extended downwardly from‘the,drive-shaftand
has its lower and mounted for rockingv movement
in a socket iii?‘ofk the moto'rb'as'e "H1171 gnarl-s
verse horizontal shaft _ [G8 is journal'od in a
bracket “19 rigidly mounted on the‘ base'HlE and
this shaft Hi8 carries an eccentric ll'ilv rotatable
in‘ an eccentric strap portion H l- ofthe: shifting‘
fork 49a; A't-v one end‘, shaft Hi8 iseduipped with
a hand wheel H2’ to facilitate sienna-1i turning:
ratio between the driving and driven gears.
gates33, the flow of oil to the pumps may be
regulated to‘effect the driving of driven shaft 6
atvtliedesired ratio of speed relative to the speed
of’ the driving shaft 5. With any given adjust
ment of the gates -33, the speed of rotation of
driven shaft 6 will automatically increase as re
sistance‘ to its vrotation is overcome or reduced.
’ From the foregoing description, it is believed
that the construction and operation, as well as
the advantages of the present invention will be
readily understood‘ and appreciated by those
I l'lilma'y be turned to shift theforliililldlarid there 70 skilled in the art. While preferred embodiments
by opera-t6 thes'p'ider‘ 34-, 35v for openi?g'o'rclo'sing
of the invention have been illustrated and de
the gates 33 of the transmission.‘ '9theriwi'se‘,[the
scribed in cons_iderabledetail, itwill be apparent
transmission‘ of this: embodiment-is? constructed ' that'the‘ invention is susceptible of modi?cation
thereof. Thus,‘ by' turning ‘shaft’il’gl8lieccéntric
exactly ‘the ‘same as" that already" described in'»
connection wan Figures 1 to» 10, inclusive;
' '
_ and changes in‘ details of construction such ‘as
75 fall within the spirit and scope of the invention
as claimed. With the arrangement shown in Fig
ure 11, the inertia of an idling engine can‘ be
used while driving on a down grade for braking
purposes, the oil ?owing to the pump gears trans
. mitting momentum of the vehicle to the slow
running engine so that only limited use of brakes
is necessary. When the pedal 50 is not depressed,
the arrangement results in free-wheeling. Also,
by controlling the ?ow of oil to the gear pumps,
ing forwardly through the housing, laterally ex
tending arms on the rock shafts, a spider longi
tudinally slidable on the driving shaft and having
angular arms provided withrearwardly extend
ing outer end portions, said rearwardly extend
ing outer end portions being provided with for
wardly converging, inclined slots receiving the
free ends of said arms whereby rearward move
ment of the spider effects swinging of said arms
the transmission functions as a clutch as well as 10 in one direction to effect opening of said gates
and forward movement thereof effects swinging
to change speed. As a whole, the transmission
of the. arms in the opposite direction to effect
also acts as a ?y wheel.
closing of said gates.
What I claim is:
4. In a driving apparatus, a variable speed
1. In a driving apparatus, a variable speed
planetary type hydraulic transmission compris
planetary type hydraulic transmission comprising,
ing, in combination with aligned driving and
in combination with aligned driving and driven
driven shafts, a housing having a pump cham
ber, means to secure said housing on the driving
shaft for rotation with the latter, gear pumps ar
shafts, a housing having a, pump chamber, means
to secure said housing on the driving shaft for
rotation with the latter, gear pumps in said pump
ranged in said pump chamber at opposite sides 20 chamber at opposite sides of the housing, each
gear pump including intermeshing gears jour
of the housing and spaced apart to provide an oil
naled for rotation relative to the housing upon
space therebetween, each gear pump including
axes parallel with the driving and driven shafts,
intermeshing gears journaled for rotation rela
a sun gear secured on the driven shaft and mesh
tive to the housing upon axes parallel with the
driving and driven shafts, a sun gear secured on 25 ing with one gear of each pump, and valve gates
for controlling the ?ow of oil to the respective
the driven shaft and meshing with one gear of
pumps at the periphery of the housing, said hous
each pump, and swinging ‘valve gates for con
ing further having an oil supply chamber, and
trolling the ?ow of oil from said oil space to the
?oat means for automatically controlling admis
respective pumps between both gears of each
pump and the periphery of the housing, and man 30 sion of oil to the pump chamber from said sup
ply chamber so as to maintain oil at a prede
ually operable means for operating said gates to
termined level in said [pump chamber.
regulate the opening or closing thereof.
2. In a driving apparatus, a variable speed
5. The construction de?ned in claim 1, in com
bination with radial baffles in said oil space be
ing, in combination with aligned driving and 35 tween the pumps and at opposite sides of the
driven shaft.
driven shafts, a housing having a pump cham
6. In a driving apparatus, a variable speed
ber, means to secure said housing on the driving
planetary type hydraulic transmission compris
shaft for rotation with the latter, gear pumps
ing, in combination with aligned driving and
in said pump chamber at opposite sides of the
driven shafts, a housing, a transverse partition
housing, each gear pump including intermeshing
dividing the housing into a pump chamber and a
gears journaled for rotation relative to the hous
supply chamber, said partition having openings
ing upon axes parallel with the driving and driven
planetary type hydraulic transmission compris
shafts, a sun gear secured on the driven shaft
and meshing with one gear of each pump, and
therein adjacent the periphery of the housing,
means to secure said housing on the driving shaft
swinging valve gates for controlling the flow of 45 for rotation with they latter, gear pumps in said
pump chamber at opposite sides of the housing,
oil to the respective pumps at the periphery of
each gear pump including intermeshing gears
the housing, a ?ller block on the periphery of the
journaled for rotation relative to the housing
casing and extending inwardly between the outer
upon axes parallel with the driving and driven
portions of the gears of each pump, said pumps
being spaced apart to provide an oil space be 60 shafts, a sun gear secured on the driven shaft
and meshing with one gear of each pump, valve
tween them, the gears of said pumps and the ?ller
gates for controlling the flow of oil to the re
blocks being disposed to admit oil from said oil
spective pumps at the periphery of the housing,
space to each pump with the oil ?owing between
?oat chambers in the supply chamber and com
the outer sides of both gears of each pump and
the periphery of the housing in the direction of 55 municating with the openings in the partition,
and centrifugally-opened spring-closed ?oat
rotation of the pump gears.
valves in said ?oat chambers for automatically
3. The construction de?ned in claim 2, in com
controlling passage of oil from the supply cham
bination with manually operable means for op
her to the ?oat chambers so as to maintain oil
erating said gates to regulate the opening or
closing thereof, said last-named means compris 60 at a predetermined level in said pump chamber.
ing rock shafts carrying said gates and project
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