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Патент USA US2137939

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4Nov. 22, 1938.
w_ A, EATON
TRANSMISSION CONTROL MEOHANISM `
Filed July 17, 1935
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2,137,939 .
2,137,939
I Patented Nov. 22, 1938 l
_
PATENT OFFICE
UNITED - STATES
_
2,137,939
'mANsmssloN coN'raor. smcnANlsM
WilfredI A. Eaton, Pittsburgh, Pa., assignor to
,
Bendix-Westinghouse
f
Automotive Air Brake
'
Company, Pittsburgh, Pa., _a corporation of Del
aware
I
l
sppucauon July 11, 193s; sensi No. usas
'
1s om -(ci. 1oz-»3.5).
Other objects and noval features of the in
Y This invention relates to transmission gearing
control mechanism and more particularly to a vention will appear more fully hereinafter from
mechanism ofthe above character which may be the following detailed description when taken in
remotely controlled and hence particularly adapt
connection with
hicles of the type having a transmission gearing
‘ located at a distance from the operator’s control
station.
.
the ' accompanying drawing,
wherein a preferred embodiment of the invention 5
I 5 able i‘or use .in connection with automotive ve
»
’
-. One of the objects of the present invention is
10 to provide a novel remote vcontrolled vehicle
‘transmission and 'clutch mechanism ~so consti
tutedrthat energy for eiiecting establishment of
aldesired gear relation will `be dependent upon
disengagement of the vehicle clutch.
l5 _Another object ‘of the invention is to `provide a
transmission ’control 4mechanism wherein- la. se
is illustrated. It is to be expressely understood,v
however. that the drawing is employed for pur
poses of‘illustration only and is not designed as
a deñnltion >of the limits of the invention, ref
erence being had for this purpose to the append- 10
ed claims.
»
In the drawing, wherein ` lsimilar reference
characters refer to similar parts throughout the
several views:
'
Fig'. 1 is a diagrammatic view, partly in sec- ß
tion, illustrating an automotive vehicle trans
mission control mechanism constructed in ac
. lector member may be moved by remote con
trolling means to select a- desired gear relation
cordance with the principles of ‘the present in
and thereafter moved to establish such selected
vention:
20 relation, such latter 'movement,'however, being
` dcpendent upon disengagement of the vehicle
clutch.
»
~
_
.
.
"
I'ig. 2 is a partial sectional view of a portion of 20
_the transmission control mechanism> and' illus
trating theselector apparatus, and
.
_. Fig. 3 is an axial sectional view of one of the
.i
' ).Still another object is to provide, in al trans
mission control mechanism of the above char
gs aâter, a novel arrangement insuring that during
control valves utilised with thevv manually-oper- >
.
able control unit ci Iig. 1.
25'
Referring more particularly to Fig. l, a trans
power-operated -shitting of the transmission
mission control mechanism constructed in ac
g f rs, the- latter will be engaged slowly and` ei
ently in order to avoid undue noise and cordance with the present -invention is illus
c
_ l‘so
-
-
unit for establishing a selected gear relation. _the
ni‘ovement o! said unit being cushioned or
checked throughout a portion of its stroke >in o_r
- 35 den to cushion actual engagement oi the trans
mission 'geara
and neutralizing power unit whereby engagement
4o of the transmission gears is cushioned and wherq‘
inthe unit operates to neutralize the gears.
with the' transmission gears or clutches, not
shown, and operable in the usual manner to es
tablish a desired gear- relation, Preferably. the
~selection and establishment of the‘deslred sear 35
relation is elected through a power-operated
l
A further object is to provide.. in a device of
the above character. a novel combined cushioning
_
A still further 'obiect'is to provide a novel neu
tralizing device which shall be under the Joint
control of the remotely-positioned gear-shifting
45 lever and the disengaging movement of the ve
hicle clutch, thus insuring that the clutch shall
be disengaged when it is desired to neutralize
the gears.
' t
trated therein in connection with a vehicle
>transmission gearing 4 >or any well known type 30
sio'n control mechanism. a `huid-operated power ï and including ‘shifter forks i, 6 and» 1 engagedv
’LA further object is to provide, in a transmis
A furtlœr obiect is to provide a novel arrange
60. ment of parts which shall provide a. remotely
controlled power gear-shifting mechanism of
simple and sturdy construction as well as eili
mechanism remotely controlled through an op
erator-controlled unit l, there being also pro
-vided‘a vehicle clutch-controlling element s and
a iluid pressure-controlled actuator It therefor' 40
which is incorporated in the transmission con
trol system in a manner which kwill appear more
fully hereinafter.
"
c
The iiuid pressure control for the transmis
sion 4 more particularly includes a transmission 45
cover Il formed with a cylinder l2 in which a ’
double-acting shifting piston assembly l.I3 com- ‘
prising piston heads I4 and Il respectively is
adapted to reciprocate in- either direction fromv
the normal neutral position indicated, each of 50
the piston heads being suitably secured to a
piston rod Il and having interposed therebe
tween a combined sel'ecting and shifting finger
Acicntly and positively -operableand capable of
ready installation on'vehicles having selective- l1, the latter being cseillatablyv mounted upon
'thepistonrod Adepending portion itisiormed 5s
2,137,939
integrally 'with the selector member I1 and nor
mally engages the upper slotted end portion I9
of the shifter fork 3` but is adapted to be oscil
lated by means tobe described hereinafter in
detail to effect operative engagement with the
upper slotted end portions 23 or 2I of the shifter
forks 1 and 5 respectively. As shown, each of
the shifter forks 5,3 and 1 is secured to shifter
bars 22, 23 and 24 respectively, and upon selec
10 tion and movement of any of these shifter bars,
desired- gear relations of the transmission 4 will
be established in a well known manner.
movement of the control lever 43 to the right
hand and left-hand extremities of slots 43 and
44. Valve 36 will be also operated upon move
ment of the control lever 43 to the right-hand
extremity of slot 42. ' The operation of the valves
due to the above referred to controlling move
ments of the lever 43 controls the admission and
exhaust of fluid pressure to the selector and
shifting devices 25 and I3 respectively in a
manner which will appear more fully hereinafter. 10
As heretofore stated, the vehicle clutch-con
trolling member 9 is provided with a fluid pres'
sure device I3 for controlling disengaging and
engaging movements of such element. As shown,
In order to effect oscillating movement of the
selector member I1 for selection of a desired
15 shifter bar, a fluid pressure-operated selector the element 9 is secured to a rotatable shaft 41 15
device 25 is provided which is constituted by a having an arm 43 attached thereto at one end
cylinder ,26 having a piston 21 therein, the latter which in turn is operatively connected with pis
being normally maintained in the position shown ton 49 in the device I3 through a piston rod 53.
in Fig. 2 as by means of centering springs 23.` The piston 49 is housed 'within a cylinder 5I
20 The’piston 21 is ‘provided with a piston rod 29 , and is normally maintained in the position 20
extending through one end Wall of the cylinder shown, with the clutch-controlling member 9 in
26 and is operatively engaged with a flanged ex
tension 33 .of the selector member I1, such ex
tension being of such nature that the operative
clutch-engaged position, as by means of an ex
pansible spring 52. It will be apparent, how
ever, that upon appllcation of fluid pressure to
25 connection with the piston rod 29 is maintained ` the cylinder through a suitable connection 53, 25
irrespective of the longitudinal gear-establishing the piston 49 will be moved in such a direction
movement of the member I1. Suitable fluid as to compress spring 52 and effect clutch-dis
pressure connections 3I and ~32 are provded` upon engaging movement of the element 9.
either side of the double-acting shifting piston
30 assembly I3, while connections 33 and 34 are
provided for admitting fluid pressure to the oppo
site ends of the selector device 25, it being readily
perceived from the above described arrangement
that by properly controlling the ilow of iluid
pressurek through said connections, any desired
shifter bar may be selected through operation
of the device 25 and thereafter may be shifted
Inforder that disengagement of the vehicle
clutch shall be assured prior to any establish 30
ment of_ a gear -relation in the transmission 4,
the admission of fluid pressure t0 the shifting
device I3 is contingentupon clutch-disengaging
operation of the clutch actuator I3. To this
end, a clutch-controlling valve mechanism 54 is 35
provided which is operated during depression of
the clutch-controlling pedal 55 and serves to
admit fluid pressure from a reservoir 56 to the
clutch actuator I3 through conduits 51 and 53.
At the same _time fluid pressure is'admitted to
sir'ed gear relation.
'
,_
Means are provided by the present invention the clutch actuator I3 through conduit 58, fluid
pressure 'is also admitted through conduit 53 to
for remotely controlling the flow of fluid pres
sure to the selector and shifting devices, and the control unit 3 and the construction of the
preferably such means are constituted by anV latter is such that fluid pressure through said
conduit is led to valves 36 and 33 only, such 45
operator-controlled Yunit- 3, conveniently posi
tioned adjacent the usual manually-operable valves controlling the flow of fluid pressure di
controls of the vehicle. As shown, such unit rectly~to the shifting device I3 through connec
includes a casing 35 housing a plurality of simi- ‘ tions 32 and 3I'respectively. In this manner, it
lar valve mechanisms 33, 31, 33 and, 33 which will be readily observed that no energy _is avail
are selectively operable through movement of a able to effect movement of the shifting device I3 50
manually-controllable lever 43. Preferably, the until energy has been supplied to the clutch actu
ator I3 and hence clutch-disengaging movement
construction is such that the lever 43 is mov
able in a conventional preselective gear-shifting of the element 9 takes place before the estab
simulating manner, and to this end the casing lishment of any gear relation. The supply of
35 is provided with a cover 4I having formed fluid pressure to _the valves 31 andg39, however,
in either of opposite directions through the
double-acting shifting piston I3 to effect any de
therein longitudinally-arranged parallel slots 42,
is independent of the clutch-controlling valve
43 and 44 in which lever 43 may be moved.
54 and operation of these valves serves to di
rectly connect the .reservoir 56 to the selector
A
transverse -slot 45 interconnects the longitudi
nally-arranged slots and permits the lever 43 to be
device 25 through conduits 59 and, 33 or 34 de
moved from one to another of the latter in a
pending upon whether valve 39 or valve 31 -is 60
actuated. Hence, selecting movement of the de
manner simulating manual control of a selective
The control element 43 is preferably universally
vice' 25 may take place without depressing the
clutch-controlling member 55 but actual shifting
mounted within the ~control unit 3 in such a
movement to establish a gear relation can only
transmission
gearing.
i „
'
`
manner that the valves 33, 31, 33 and 39 -will be be effected after movement of thel clutch-con 65
selectively operated through cam mechanisms 43 trolling _pedaL Such a’valve may be. constructed
in accordance withvthe principles set forth in
during movement of theY control lever 43. Oper
ation of these cam mechanisms is effected by a the patent to Lester A. Fowler, No. 1,626,607.
The clutch-controlling valve 54 is preferably
cam operator 46a as the element 43 is pivotally
70 moved about a point where the dot and dash - of the self-‘lapping type and may be constructed 70
lines a and b intersect the element 43. _As .in any suitable manner in order to effect a pro
shown, valves 31 and 33 will -be operated during gressive control of the pressure supplied to the
movement of the lever 43 to the right-hand >and clutch actuator I3 in accordance with the pres
left-hand extremities respectively of slot 45, while sure applied to the clutch pedal 55. Since this
valves 33 and 33-¿will be respectively operated by valve mechanism forms no part of the present
.
2,137,939
invention, the same has not been shown in detail.
Referring more particularly to Fig. 3,`the valve
3
11 or 18, depending upon the direction of move
ment of the device I3, "lill enter its associated
mechanism 31 is'shown in detail therein and in
socket 30 in order to'restrictthe exhaust of fluid `
cludes a bore 60 in which a pressure-responsive
from 'the respective'cylinder 15 or 16 to the con
duit 53, thus cushioning or retarding the re
device, such as piston GI, is slidably mounted.
The piston 6I divides the valve bore into an ex- ' -mainder of the> movement of the shifting device.
haust chamber 62 _and an outlet chamber $3, the
former normally communicating withatmosphere
through a connectionM, while the latter is in
10 I»constant communication with the conduit 34.
As shown, the valve 31 is in normal released posi
tion wherein chamber 63 communicates with
chamber 52 and the atmosphere through com
municating ducts 55 and t5 in the piston 6|,
However, when
valve-operating movement'of the cam. 46 takes
place, the piston 6I is moved downwardly through
15 thereby exhausting 'conduit 34.
The projections 19 are so adjusted with respect
to the associated pistons that such exhaust'of
air is restricted at substantially the moment that
the transmission gear relation is about to be 10
established, thus cushioning the `actual engage
ment of the gears and avoiding gear clashing
and possible breakage of teeth. If desired, a‘sup-plemental inlet connection B4 may be utilized at
the ends of the cylinders ‘iii4 and 16 connecting 15
said cylinders ‘with the conduit 58 and having
check valves 83 therein permitting the iiow of
fluid in one direction only, namely to the cylin
a cap‘61 connected to the piston through a`
graduating spring 68 and the piston contacts an ders, this construction being desirable in order
to permit free entrance of fluid to the cylinders
exhaust' valve t9 in. order to close communica
when it is desired to return the shifting device
tion between chambers 53 and 62. Further down
ward movement of the piston eifects unseating of to neutral position through actuation of the
I
an intake valve 1i), connected to the exhaust valve clutch-controlling pedal 55.
vln operation, if it is desired~ to select an
89, and establishes communication between cham
establish ‘hrst gear relation for example, the
25 ber 53 and the iiuid pressure supply line 59
through an intake duct 1I formed in the casing vehicle clutch-controlling pedal 55 may be de
of the control unit. It will be noted that after the pressed in the usual manner in order to connect
reservoir 56 with the clutch actuator IIJ through
, above operation has been effected, the piston 6I
operation of ’valve 54, as heretofore described.
will be subjected to the pressure of the iiuid with
30 in the outlet chamber 63 _which is proportional to It will be understood from this operation that
the pressure of the iluidisuppiied to the'conduit iiuid pressure will not only be conducted to the
34, and when such pressure rises to a value suf-_ clutch actuator Ill through conduits 51 and 58
ilcient to overcome the tension of the graduating but fluid pressure will also be conducted through
spring 58, the piston 6i will be moved upwardly to conduit 58 to the control unit 8, thereby rendering
35 permit closing of the intake valve 1li under the available a supply of iiuid for valves 3,6 and 38.
action of‘a spring 12. The valve will thus be Subsequently, it is only necessary to move the
lapped and will remain in such position> until control lever 4Ii to the right-hand extremity of
the tension in spring 68 is increased or until such slot 45 and forwardly or, as >viewed in Fig. l, to
tension is relieved. In the latter event, the parts the left-hand extremity of slot 44, such move
vment successively operating valves 31 and 38
40 will be returned to the position shown in Fig. 3, -'
such action being aided by a sping 13 acting upon through the cams 46, Operation of valve 31 will
the underside of piston 5i.
ñ
,U
The present invention provides a novel arrange
' ment for cushioning the movement of the shifting
20
30
~
4.o
conduct ñuid pressure directly from the reservoir '
to the right-hand portion of the Vselector device
25, as viewed in Fig. 2, through conduit 59, valvev
31 and conduit 34, thereby moving the piston 21 45
of the said selector device to oscillatey the selector
piston at a point in the stroke of the latter when
a gear relation is about to be established. Such ' finger I1 to such a position that the depending
construction is highly desirable, since it more
portion I8 thereofl engages the notched end 2li
closely _simulates manual shifting of the trans
o! shifter fork 1. Upon operation of valve 38,
mission gears and avoids gear clashing and pos
ñuid
pressure rendered available in the manner 50
.50 sible'breakageof gear- teeth during power shift’
described above will be conveyed through con
- ing. As shown, such >means includes a pair of
duit 3i to the piston head I 4 >and will cause move
cylinders 15 and 15 secured to the cover _i I and ment of the piston assembly I3 to the left, as
housing piston 11 and 18 respectively. Each of
these pistons is provided with an adjustabiy
positioned tapered projection or pin`v19 which is
adapted to enter a socket 80 provided in the end
wall of each cylinder. As shown, each oi these
sockets communicates with the conduit 58
through suitable connections 8l, and by such an
arrangementf it will be observed that each of
` the cylinders 15 and16 is supplied with ñuid pres
sure through- conduit 58 whenever the clutch
controlling pedal is depressed. Since the pistons
11 and 18 have operative engagement with piston
heads >I4 and I5 through elongated skirts 82, it
will be -perceived that upon depression of the
‘ clutch-controlling pedal 55 and admission of duid
pressure to cylinders 15’ and 15, the shifting device
I3 will be returned to neutral position and thus
70 neutralization oi’ the transmission is assured ir-respective of the gear relation established.
1.»
viewed in Fig. 1, in order to effect corresponding
movement .of the selected shifter bar 24. Thus, 55
first gear relation~will be established by suc
cessive operation of the nvehicle clutch-controlling
element 9 through the pedal 55 and movement of
lever 4ll which takes place in a manner simulat
ing the movements of l a conventional manually
operated selective gear-shifting lever.
' It will be observed that at the time fluid pres
_sure is applied to the piston i4 to effect first
gear relation, -as above described, fluid pressure
is also applied to the neutralizing pistons 11 and
18 through conduit 55 which connects neutraliz
ing cylinders 15 and 1B directly with the open
clutch-controlling valve 54. However, although
the pressures applied to said. neutralizing pis
tons are opposed, the piston assembly I3 will be 70
moved in response to the fluid pressure applied
Moreover, the pins 19 carried by the pistons 11 to piston head I4 by reason of the fact _that the
and” are so adjusted that during gear~establish- cross-sectional area of said last named~ piston is
ing movement of the shifting device Il in either .greater than the cross-sectional area of either
.
direction, one oi the pins 10 carried by the piston of pistons 11 or 18,.v -
4
"
2,137,939
axial engagement ofthe gears and a neutrali
During shifting movement of the piston as
semblyl I3 in the manner above described, the
fluid pressure contained within cylinder 15 will
be forced outwardly through the opening 80 in
the end of said cylinder, and when firstv gear
relation is about to be established, the tapered
pin 19 will enter the openingßß in order to re
spectively are moved to exhaust position.
While the operation of the invention has been
strict the further egress of fluid pressure from
described in the above manner as being initiated
the cylinder 15. At this point in the movement
10 of the shifting assembly I3, the rate of movement
with depression of the clutch-controlling pedal
thereof wil.1 be decreased or retardedthroughout
vthe remainder of its stroke and thus the actual
engagement of the transmission gears to effect
first gear ratio will be greatly facilitated. Such
15 a construction prevents noisy gear engagement
and clashing of gear teeth which might other
wise result in the event that the movement of the
shifting assembly were not checked at the timefirst gear relation was about to be established.
zation of the transmission gears is effected upon
depressing of clutch-controlling pedal 55 pro
vided the valves 36 or 38 controlling the flow of
fluid pressure to the piston heads I5 and I4 re
55, it will be understood that since the invention 10
provides an interlock between the control unit 8
and the clutch actuator I0, the control lever.40
may be moved to any desired position prior to
actuation of the clutch-controlling pedal 55. For
example, to establish nrst gear relation in this
manner, it is only necessary to move the control
lever 40 to the left-hand extremity of slot 44.
Initial movement of the lever to the end of slot
45 will supply fluid pressure to the selector de
vice 25 in order to select shifter bar 24. Oper 20
ation of the valve 38, however, due to movement
of lever 4l)- to the left-hand extremity of slot
Following selection and establishment of the
flrst gear ratio, it is only necessary to permit re
turn of the clutch-controlling pedal 55 to control
the exhaust of fluid pressure from the actuator ' 44, will merely open a connection between valve
50
I9 whereupon the vehicle clutch-controlling
member 9 will permit return of the vehicle clutch
to engaged position through the action of the
usual clutch control springs and the graduating
54 and the cylinder I2 containing piston head I4
through conduits 58 and 3I. Actual supply of
fluid pressure to the piston head I4, in order to
effect gear-establishing movement of the latter,
spring 52 within the actuator I il.
Establishment of second gear relation is ef
will not take place, however, _until depression
neutral position as soon as the control lever 40
of the controlling pedal 55 which connects con
duit 58 with the reservoir 5B through valve' 54 30
and conduit 51. Thus, gear-selecting and estab
lishing movement of the control lever may take
place prior to any movement of the clutch-con
trolling member 55, and the gear relation, though
selected, will not be established until valve 54
has been operated to supply the fluid pressure to
the actuator I0 to disengage the vehicle clutch
and furnish fluid power to effect the actual shift
has been moved a suilicient distance in the slot
ing operation.
fected by depressing the clutch-controlling pedal
55 and moving the control lever 40 to the right
hand extremity of slot 44. In the ilrst phase
of this operation, that is upon depression of the
clutch-controlling pedal 55, fluid pressure will be
35 simultaneously applied to the neutralizing cylin
ders 15 and 16 and the pistons 11 and 18 there
in will return the piston assembly I3 to central
44 to permit valve 38 to exhaust the fluid pres
sure applied to the piston head I4.
As soon as
the shifting assembly I3 is neutralized, the op
eration of the valve 36 caused by continued move
ment of the control lever 40 in the slot 44 will
admit fluid pressure from the reservoir 56 through
the clutch-controlling valve 54 and conduit 58
to the conduit 32, and thence to the piston head
I5 and effect movement of the piston assembly
I3, shifting finger I1 and shifter bar 24 to the
right, as viewed in Fig. 1, in order to establish
There has thus been provided by the present 40
invention a novel control mechanism for an au
tomotive vehicle transmission which is so consti
tuted as to be remotely controlled in a novel and
efficient manner. The provision of the interlock
between the control unit of the transmission and
the Vehicle clutch enables selecting and sluiting
movement of the operator’s control member prior
to declutching movement of the vehicle clutch, the arrangement being such that as soon as the
vehicle clutch is ‘ disengaged, the selected gear
3l and 39 respectively, such operation serving
ratio is established. 'I'he invention moreoverl pro
vides a novel arrangement for cushioning engage
ment of the transmission gears, this being
achieved by the utilization of the cushioning units
associated with the power-operated shifting de 55
vice. Such units moreover perform the addi
tional function of effecting neutralization of the
transmission upon depression of the clutch-con
trolling' member 55 in the event that the opera
60 to move the central shifter bar 23 to the left
tor’s control member is moved to neutral position. 60
second gear relation. Here again, the actual
engagement of the gears will be cushioned when
the-pin 19 carried by the piston 18 enters the
opening 8Il positioned in the end of neutralizing
55 cylinder 16.
, Establishment of third and fourth gear rela
tions is effected by left and right-hand move
ment of lever 40 in slot 43 which controls valves
and right respectively. Reverse gear relation is
selected by operation of the valve 89 through
movement of the lever 40 to the left-hand ex
tremity of slot 45 and continued movement of
the said lever to the right-hand extremity of the
slot 42 which effects operation of thevalve 36.
While only one embodiment of the invention
has been disclosed and described herein, it is to
be understood that the invention is not limited to
such embodiment but may be capable of expres
These movements serve te conduct fluid pressure
sion in other forms, as will now be understood
by those skilled vin the art. Reference will there
fore be had to the appended claims for a defini
'to the left-hand end of selector device 25 to en
tion of the limits of the invention.
gage portion I8 .of finger I1` with the shifter fork
70 l and thereafter move the shifter bar 22 to which
the fork is attached to the right, as viewed in
Fig. 1'.
During all of the above described shifting
movements, the cushioning or checking devices 19
75 will cooperate with the openings 89 to cushion
What is claimed is:
'
.
l. In a control mechanism for a vehicle gear
I70
shifting apparatus having a member laterally a'id
longitudinally movable to select and establish a
desired gear relation, a pressure-operated device
for moving said member laterally, a pressure-op
erated device for moving said member longitudi 75
:2,137,939
d
5
nally in opposite directions, a reservoir of fluid
upon operation of said valve means for conduct
pressure, a vehicle clutch-controlling element, a
power actuator therefor, a valve operable to con
nect said reservoir and actuator to eil‘ect' clutch
ing fluid pressure to said control unit.
5. In a control mechanism for a vehicle gear- e
shifting apparatus having a selector and shifting
member normally occupying a' neutral position,
disengaging movement of the clutch-controlling
element, valve means _operable to directly connect
means formounting said member adjacent said
apparatus, a fluid pressure-operated device for
said reservoir and ñrst device to select a desired
gear ratio, valve means operable to 'connect said
second device to said reservoir through said flrst
named valve, whereby said second device is sup
plied with fluid pressure only when said valve is
operated to connect the reservoir and actuator,
and a manually-operable control levez` mounted
oscillating said member to select a desired gearv '
ratio, a fluid pressure-operated device for shift
ing said member longitudinally for establishing 10
the selected gear ratiol a vehicle clutch-control
ing manner for operating said valve means.
ling element, fluid pressure means for operating
said element, a separate fluid pressure-operated
device cooperating with said second named pres
sure-operated device for returning the latter to 15.
2. In a control mechanism for a vehicle gear
shifting apparatus 'having a member laterally and ,
tion, and manually-operable means for supplying
‘ for movementl in a selective gear-shifting simulat
gather with the selector member to neutral posi- .
fluid pressure to said fluid‘pressure means and. to
longitudinally movable to select and establish a
desired gear relation, a fluid pressure-operatedv
20 device for moving said member laterally, a fluid
pressure-operated device for moving said mem
ber longitudinally in opposite directions, a reser
voir of fluid pressure, valve means operable to
, said separate fluid pressure-operated device.
>6. The combination with a shifter bar of an
automotive vehicle transmission gearing, of a
lluid pressure-operated device operatively con
nected with said bar and having a normal neutral
directly connect said reservoir and llrst device to ~ position, means for admitting fluid pressure to
>said device to selectively move the4 latter and 25
25 select a desired gear ratio, a vehicle clutch-con
trolling element, a power actuator therefor, and bar in either of opposite directions from said
neutral position to establish a desired gear rela- 4
means including a pedal-operated valve for- con
necting said reservoir and actuator to effect tion, and means operable only after a portion
of the said movement has been completed for
clutch-disengaging movement of the clutch-con
checking the remaining portions of the. move 30
trolling element and' for connecting said reser
'voir and said second device whereby the latter ment, said last named means constituting means
operable by fluid pressure for positively return
is moved to establish the desired gear ratio.
ing said device and bar to neutral position.
3. In a control mechanism for a vehicle gear
7. The combination .with a shifter bar of an
shifting apparatus having a member laterally and
35 longitudinally movable to select and establish a automotive vehicle transmission gearing, of a 35
fluid pressure-operated device operatively con
desired gear relation, a double-acting fluid pres
nected with said bar -and having anormal neu
ì sure-operated device for moving said member lat
erally in opposite directions to select a desired tral position, means for admitting fluid pressure
to said device to selectively move the latter and _
bar in either of opposite directions from said 40
, gear relation, a double-acting ñuid pressure-oper
40 ated device for moving said member longitudinally.
neutral- position to establish a desired gear rela
tion, means operable to retard vfurther move
ment of said device and bar only after sufllcient
in opposite directions to establish the selected gear
relation, a vehicle clutch-controlling element, a
fluid pressure-operated motor therefor, a reser
voir of iiuid‘pressure, a pedal-operated valve for
directly connecting said reservoir and motor to ei'
movement of the latter has _taken place that
the gear' relation is about to be established. and 45
means forrsupplying iluid pressure to said last
fect clutch-disengaging movement of said ele
ment, a 'pair of valves selectively operable to di
rectly connect said reservoir to said ilrst -device
named means to return the device and bar to
whereby the latter is operated to move the mem- l
8. The combination with a shifter bar of anY
automotive vehicle transmission gearing, of a 50
ber to select a desired gear relation, -a second pair
neutral position when desired.
fluid pressure-operated device operatively con
of valves selectively operable to establish com
munication between said second device and said , nected with said bar and having a normal neu
motor whereby ñuid pressure conducted to said trai position, means for admitting fluid pressure '
motor will befled to said second device to effect to said device to selectively move the latter and
barin either of opposite directions from said 65
movement of said member to establish the se
lected gear relation, and a manually-operable neutral position to establish a desired gear rela
tion, and common -means for cushioning a part
member movable in a selective gear-'shifting simu
of the movements of said device during gear
lating manner for controlling said pairs of valves. establishment
and for returning said device and
4r In a control mechanism for a vehicle gear
"00 shifting apparatus, a fluid pressure-operated
shifting unit movable in opposite directions from
, a central neutral position to establish‘a selected
gear relation, said unit including an oscillatable
selector member- movable to select a desired gear
relation, ñuid pressure means forrefi'ecting oscil
lating selecting movement. of said member, means
for controlling the flow of fluid pressure to said
means and said unit including a conti ol unit hav
70 ing a manually-operable lever, a clutch-control
ling member, fluid pressure-operated means for
effectingl clutch-disengaging movement of said
clutch-controlling member, `manually-operable
bar to neutral position.
„
oo
9. The combination with a shifter bar of
automotive vehiclel transmission gearing, of a
fluid pressure-operated device including av double
acting piston operatively connected with said bar
and having a normal neutral position, means 65
foi` admitting fluid pressure to said device to
selectively move` the piston and bar in. either of
opposite directions from said neutral position to
establish a desired gear relation, and means for
cushioning a part of the movements of said pis 70
ton and bar during gear establishment compris
- ing independent pistons disposed on opposite sides
of said double-acting piston.
,
10. The combination with a shifter bar of an
valve means for energizing said last named fluid
75 pressure-operated means, and means dependent' automotive vehicle transmission gearing, of a 75
46
2,137,939
fluid pressure-operated device including a double
acting piston operatively connected with said bar
said-member to select a desir-ed gear ratio, a l
and having a normal neutral position, means for
admitting fluid pressure to said device to selec
for establishing the selected gear ratio, means to
control the admission and exhaust of fluid to
and from said second device, and means includ
ing a pair of independent fluid-operated pistons
fluid-operated device for shifting said member
tively move the piston and bar in either of op
posite directions fromsaid neutral position to
establish a desired gear relation, means for cush
ioning a part of the movements of said piston
and bar during gear establishment comprising
10 independent pistons disposed on opposite sides
of said double-acting piston, and means for si
multaneously subjecting said independent pistons
to fluid pressure after the desired gear relation
has been established to return the double-acting
15 piston and bar to neutral position.
‘
11. The combination with a `plurality of shifter
bars of an automotive vehicle transmission gear
ing, of a control mechanism therefor comprising
a pressure-operated device for selecting a de
20 sired shifter bar, a double-acting piston mov
able in opposite directions from a neutral po
sition for moving said selected bar to establish
. the desired gear relation. andmeans including
independent pistons disposed in axial alignment
25 with said double-acting piston for cushioning a
portion of the gear-establishing movement ot the
latter.
12. The combination with a plurality of shifter
Acooperating with said second device for moving
the latter and member to neutral position when
fluid is exhausted from said second device.
15. In a control mechanismfor a vehicle gear
10
shifting apparatus having a selector and shifting
member normally occupying a neutral position,
means for mounting said member adjacent said
apparatus, a fluid-operated device for oscillating
said member to select a desired gear ratio, a 15
double-acting piston for shifting said member for
establishing the selected gear'ratio, pistons dis
posed on opposite sides of said first piston, opera
tively connected wlth the latter and of less cross
sectional area, means for conducting fluid pres
sure simultaneously to the outer faces of thev
second named pistons, and means for conducting
fluid pressure to the space between either of said
second named pistons and said first named piston
to effect movement of said first piston irrespec
tive of fluid pressure supplied through said first
named conducting means.
`
16. The combination with a shifter bar of an
automotive vehicle transmission gearing, of a
bars of an automotive vehicle transmission gear
30 ing, of a control mechanismtherefor comprising ' power-operated device
_a pressure-operated device for selecting a de
sired shifter bar, a double-acting piston mov
able in opposite directions from a neutral po
sition for moving said selected bar to establish
35 the desired gear relation, means including inde
for effecting shifting
movement of said bar in opposite directions from,
a neutral position to establish either of a pair
of selected gear ratios, >and ñuid pressure means
separate from said device for returning the latter
pendent pistons disposed in axial alignment with
and bar to neutral position.
~'
17. The combination with a shifter bar of 'an
said double-acting piston for cushioning a por
tion of the gear-establishing movement of the
pressure means including a double-acting piston
latter, and means for simultaneously subjecting '
40 said independent pistons to ñuid pressure to ef
fect a return of said double-acting piston and
selected bar to neutral position.
13. In a control mechanism for a vehicle .gear
shifting apparatus having a selector and shifting
45 member normally occupying a neutral position,
means for mounting said member adjacent said
apparatus, a fluid-operated device for oscillating
said member to select a desired gear ratio, a‘
fluid-operated device for shifting said member
for establishing the selected gear ratio, means to
50
control the admission and exhaust of 'fluid to
and from said second device, and means includ
ing fluid-operated means for moving said second
device and member to neutral position when fluid
55 is exhausted therefrom.
14. In a control mechanism for a vehicle gear
automotive vehicle transmission gearing, of fluid
for effecting shifting movement of lsaicl bar in
opposite directions from a neutral position to 40
establish either of a pair of selected gear ratios,
and fluid pressure means includingy a pair of _in
dependent pistons cooperating with said double
acting piston for returning the latter and bar
to neutral position.
,
=
18. In a control mechanism for a vehicle gear
shifting apparatus having a selector andshiiting
member normally occupying a neutral position,
means for mounting said member adjacent said
apparatus, power means for oscillating said mem
ber to select a desired gear ratio, power means
for shifting said member for establishing the se
lected gear ratio, means to control the energiza
tlon of said second power means, and means in
cluding fluid-operated means for moving said
second power means and member to a neutral
shifting apparatus having a selector and shifting vposition when the second power means is de
member normally occupying a neutral position, energized.
means for mounting said member adjacent said
apparatus, a fluid-operated device for oscillating
WILF'RED A. EATON.
45
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