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Патент USA US2404330

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July 15, 1945- '
D. A; WALLACE ETAL
‘
POWER TRANSMISSION
Filed Sept. 2, 1941
2,404,330
'_
5 Sheets-Sheet 1
0-2
I'NVENTOR5M
,
Fat/id -? III/4221402,
m, M Mama:
-
ATTORNEYS’.
July 16,1946-
D. A. WAFLACE ETAL
' 2,404,330
POWER TRANSMISSION
Filed Sept. 2, 1941
5 Sheets-Sheet 2
my[@/243
-
INVENTORS.
}
2%
ATTORNEYs.
July 16, 1946.
D. A. WALLACE ETAL '
2,404,330 _
POWER TRANSMISSION
Filed septgz, 1941
5 Sheets-sheaf. 5
, 3&9}??
B
Jul
52:24,
PJZUM
ATTO R N E Y5.
July 16, 1946.
~D. A. WALLACE ETAL
'
- - 2,404,330
_ POWER TRANSMISSION
Filed Sept. 2, 1941
5 Sheets-Sheet 4
I40
7
454
.
ATTORN EYS.
Ju1y16,1946-
'
D. A. WALLACE ETAL
'
POWER
TRANSMISSION
Filed Sept. _2, 1941 '
M7
"
'
2,404,350v Q
.
5 Sheets-Sheet 5
AM
434
ii
ATTORNEYS.
Patented July 16,‘ 1946 r
UNITED STATES“ PATENT OFFICE David A. Wallace and Edward 0. Lee, Detroit,
Mich., assignors to Chrysler Corporation, High
land Park, Mich., a corporation of Delaware
‘ Application September 2, 1941, Serial No. 409,210
11 Claims.
,
(01. 192-35)
1
.
2
This invention relates to improvements in
power transmissions, particularly in the shifting
mechanism for such transmissions.
.
.
.
.
.
mechanism, the positions of the parts. correspond
ing to Fig. 6.
‘ .
'
‘
.
l; .;
V
Fig. 8 is a sectional view of the Fig.7 mecha~
It is the main object of the invention to pro-
nism with the clutchfully released. ' ' ' _‘ ,'
,
vide a simple‘ and economically manufactured ~_l_i_
Fig. 9 is a sectional view of the Fig.6 mecha
power shift apparatus for conventional types of ' nism, the parts being shown in second'speed po
vehicle change speed transmissions. -_
sition with the clutchreleased.‘
'
-
.
During recent years various forms of automatic
Fig. 10 is a sectional view ‘of the valve oper
and semi-automatic power transmissions have
ating mechanismfthe positions of the parts';cor
come into vogue for motor vehicles. For the most @129 responding to Fig. 9 with the clutch engaged; and
part these transmissions ‘have been costly ‘to manFig- 11 i8 a Sectional View of the Valve operating
ufacture and have required considerable reormechanism with the. clutch released to normal
ganization of other parts of the vehicle besides
release position, thetransmission parts being in
requiring the learning of a somewhat different
high speed or direct drive'position;
driving technique on the part of. the driver.
'
I
.1?
Referring to Figs. 1 to 5, it. may be seen'that
'The power shifting apparatus disclosed and
claimed hereinis adapted for ready ‘attachment
to vehicles equipped with conventional manually
operable change speed transmissions either as a
factory installation or as a service accessory.“20
The regular engine oil pressure system is-used to
supply operating oil pressure and the transmission-control is not disturbed except that‘shifting
we have illustrated our invention as applied to a
motor vehicle havingan'enginoA, a releasable
friction clutch B and a manually shiftable trans-,
mission C. The clutch B may be of anticom
meroially' available‘ type and‘ ‘1's ‘releasable by
means of a release mechanism 50, the >fork~~5l
thereof being connected to the clutch pedal. 52
by any Suitable linkage suoh'as, for exampleithat
of gears between second and high speed ratio is '
illustrated vin Auten Patent No; 2,232,302, issued
performed by power means in response to ordi- 3'25 February 18, 1941.
nary operation of the clutch pedal.
I
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i
‘
‘ The clutch is enclosed in a housing 53: mounted '
- A further object'therefor is to provide a power
in the block of‘the engine A and a housing or
shifting apparatus operable to shift the trans‘-
Casing 54 for the transmission 0 is-fastened '60
mission gears in response to operation of the vehicle clutch pedal.
7
‘
the real‘ end thereof- A Shafb55" willingly-‘con
“530 nects the clutch B with the transmission: 1 This
Other advantages and objects will become apparent from the following description. In the
drawings accompanying Said description’,
Fig. 1 is a partial side elevation of an automobile power plant and change‘ speed transmis- ‘:35
Sign embgdying the present invention ,
i
and. a reverse gear 63. A- shiftable gear.“ splined
Fig’ 2 is a rear end elevation of the _trans_
mission
‘
I
i
shaft has a drive pinion 56 formed thereon which
meshes with a gear 51,01’ a countershaft cluster
58 carried by a countershaft 59; The cluster in
‘dudes also a'geal' 60 disposed in mesh. with the
second speed drive gem“ 5L9’ "low speed $95? 62
>
on the mainshaft 65 is adapted to be shifted into
mesh with the gear 62 to provide low. speed-ratio
drive, or with a reverse'idler gear J66 ‘to provide‘
‘0 reverse drive; the gear 68 being vcarried ,byits
mission showingthee-control mechanism thereof,
Own °°untirsh aft in permanent mesh; withthe
Fig.‘ 3 is a combined side ‘elevation and sec
tional view in an enlarged scale of the trans
th.
.
.
..
.
-
a
.
15' “8W bemg takenV as mdlcated by the‘ me
3—3 in Fig.2.
gear 63.‘
.
-
.7
>
- ‘A shiftable .clutch sleeve 61 is‘splined on
the
.
Fig. 4 is a sectional view of the. transmissionI ; ‘8, .c51195216:
1111561: of
adaptptd
tcég“;0rengage‘:
mph the
u c
ee
pinion
-d1rec drive, or
showing the ‘gears.
.
.
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.1
~
.
.
'
Fflg- 5 1.5 a‘ plan. new of the tran§m1ss1°m th?
casing being partially cut away to illustrate details of the shift mechanism.
with the clutch teeth 69
of gear 6|‘ for ‘second
- speed ratio drive. ‘Suitable blocker synchronizers
70 and H are provided to- prevent clashing‘ of
teeth as is common in the am
I
'
. ._
~
. .
Fig- 6 is an enlarged sectional View of the h‘y- 50: . The clutch sleeve Gland gearlill lare-shiftable ‘
dmuuc shifting mechanism, the parts being
shown in‘ neutral position with the. clutch engagfact
_
_
l
e
i
‘ Flg- 7 1s a sectional view takenv along the line
bya manually operated remoteshiftmechanism
which comprises aytrunnion member lZrockably.
carried'by a/rockshaft 13 by meansiof aipinllll.
The: rockshaft'is rotatably ~carried1by a casing
'l?'leof Flg. 2 and showing the valve‘ operating [1 cover‘75’ and extends outwardly therefrom; an
V
2,404,330
3
operating lever ‘I6 being ?xed on its outer end.
A shift ?nger TI carried by. the trunnion ‘I2 is
adapted to selectively engage slots ‘I8, ‘I0 formed
4
A stem I I9
is slidable within the plunger I I5. This stem has
' arates a pair of chambers H1, H8;
' an enlarged central portion I20 which snugly and
in shift yokes v80, 8| respectively.
slidably ?ts within a bore formed in the plunger
; vThe shift yoke 80 is carried by a rail 82 and
for receiving the same.
'
The yoke 8| likewise has a fork portion which
The valve stem I I9 carries a’pair of coil springs
IZI, I22 which are adapted to be compressed
between washers I23 suitably positioned in the
gaged by the usual detent mechanism 86 and
irig arm H0.
interlock pin 81.
The ?nger 'I'! is biased by a spring‘ (not shown‘)
thereon as will be clear from the drawing.
‘has an integral fork portion which engages the
‘shift collar portion 83 of the clutch sleeve 6].
stem as will presently appear. Fixed in the rear '
engages a shift collar 84 formed on the low
reverse gear 6|. Both yokes are slidable on a 1.0 end of the stem is a cOllar I24 which is engaged
‘ ‘by the bifurcated lower end of the valve operat
rod85 and the rails 82, 83 are operatively en
into engagement with the yoke £0 at. all times $1.5
'_ A selector lever 88 carried by a shaft are is adapt
ed for actuation by a lever 90 (Fig. 5) to. rock
thetrunnion 12 on the pin 14 to disengage. the
The latter is slidable on the collar
I24 within the limits permitted by the shoulders
.
Disposed outwardly adjacent the valve in the
casing I03 is an interlocking mechanism which
‘ comprises a plunger I25 slidable in a bore I20.
The plunger has a ramped rear portion I2'I which
?nger 11 from the slot 18 in yoke 80. and engage I
engages a plunger I28.
it with the slot ‘I9 in yoke BI when it is desired
ternal bore in which is carried a detent plunger
to set the transmission forrlow or reverse drive.
For a more detailed description of the shift mech
anism reference may be made to the patent of
Otto E. Fishburn, Serial No. 332,910, ?led May
2, 1940, No. 2,284,191, issued 'Maygz?, 1942.
i
The shift ‘lever 115 and selectorglever 90 are
actuated by a suitable remote control linkage
I’ ‘carried by the vehicle steering column which in
I29 and a spring I30.
The latter has an in
The plunger‘ I29 is 'per- .
mitted'to move inwardly of the bore of plunger
I28 against the spring I30 only when the plunger
I25 is in the Fig. 9 position.~ When the’plunger
25 I25 is moved rearwardly of its bore to the position
illustrated in Fig. 10, plunger I28 is thrust into
its bore compressing spring I30 which prevents
f yielding of the detent plunger I29. Thislocks
the valve plunger II5 against movement the
cludes a Bowden cable 92 andshift ‘links 93, 94
connected by bell crank 95. The arrangement is 30 plunger I29 being?always engaged withjone of
the locking grooves I3I formed in the valve
such that the driver operable shift "lever (not
shown) may be swung about its mounting in two
Plunger I25 has a forward reduced portion-I32
parallel paths of movement; the lower path con
plunger.‘
trolling the yoke 8|v and'the‘ upper path’ control
ling theyoke 80.
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which is fastened by a pin I 33 to a rod I 34. The
35 latter is vinturn-operably connected by a link I35 .
and a pin I36 with the clutch throwoutfork 5| j
1> ‘Most motor vehicle manufacturers offer an
(Figs. 3 and 5). ' The arrangement is such that
depression of the pedal 52 to effect release of
clutch ‘B will also e?ect rearward movement of
an extension housing is fastened to the rear end
.of' the-trans'm-ision casing in ‘the space which 40 plunger’ I 25 in bore I26 thereby to lock valve
overdrive _ transmission as optional 1 equipment
and on‘ those models not equipped’ withoverdrive
would ordinarily be’ occupied by the overdrive
gearing and casing. We have modi?ed this ex
tension housing and adapted it for. housing the
operating parts of our hydraulic shifting'mech
‘anism, but it is desired to point out that our in
vention isv not limited in its application to this
precise construction. _
-
plunger I I5.
ling I00, is'hollow, the mainshaft 65 extending
_
type is adapted to engage one or the other of
a pair of grooves I39 formed in the collar as will
_
As will be seen from Figs. ‘1-5, a housing I00 is
seeured'by bolts IOI to the casing 54. The hous
'
A collar I '31 is slidably disposed in the bore I25.
This collar is loose on the reduced portion I32
of the plunger I25 but snugly engages the bore.
45 IA detent I38 of the well known spring pressed ball
‘be further explained herein.
‘ I
I
The casing I03 has an inlet I40 which is con
50 nected by a pipe MI with the engine oil pump I42.
therethrough, and has means formed thereon.
indicated by numeral I02, for mounting the usual
lpropellerlshaft brake (not shown). ' Formed on
the housing I00 is a ‘casing I03 which houses the
A similar pipe I43 connects the casing outlet or
vent port I54 with the crankcase as illustrated in
Fig. 1.
'
.' The valve sleeve H4 is provided with a passage
55 I ll?which connects with the cylinder port I I2 and
fluid pressure motor and valve mechanism.
with a port I475 which opens into the sidewall of r
The ?uid pressure motor comprises‘ a. cylin
the cylinder as shown in Fig. 6. The‘ vent pas;
§'der l0=47closed at its forward end by a ‘head I05
sage I44 connects with a passage I 41 which is dis}
. and at its rear end‘by a head I03. Slidable with;
posed longitudinally of the cylinder and connects
1in the cylinder is a piston I01 which carries a
7 1 piston rod I08. The latter extends forwardly L60 with valve sleeveports I48 andI 49. A ‘drain pas
sage I50 opens into the passage I41 for draining
1 into casing 54 where it is connected by means of
the interior of the valve.
. a pin I09 with the second-high rail 82, and rear
The enlarged portion IIB of the valve stem II5
wardly of thehead I06 where a valve‘ operating
‘ arm I I0 is mounted thereon.
A suitable packing
separates two annular valve chambers II‘I, IIB
ygland II I is provided adjacent the forward cyl as carried by the stem which chambers are adapted
to’ selectivelyvconnect certain of the ports and
. inder head for sealing the cylinder.
'
‘
The cylinder I04 is ported at H2 and H3 for
the admission of ?uid under pressure thereby to
1 shift the piston I01 and rail 82.
i
The valvemechanism for controllin’githe ad- ‘7
‘ mission‘ of ?uid to the cylinder I04 comprises a
'ported'sleeve' IVI4 having a shrunk ?t in the casing
,‘ within
I03 v‘below
the the
sleevecylinder
is a plunger
I04. -Slidably
H5 having
‘disposed
a cené
passages as will presently be made clear.
‘ _
The inlet port I40 is connected with the control
valve by passages I53, I54, I55 and I50 When the
plunger I25 is moved rearwardly sufl'iciently' to
uncover passages I53 and I54, butrnot sufficiently
to move the collar I31.
This condition of the
plunger is shown in Fig. 11.
Fluid ?owing into the valve is blockedrby the h
‘ trally positioned enlarged portion I’I'6 which sep, . . enlarged portion H3 of the stem II5 when the
5
2,404,330
latter is in neutral position (Figs. 6, 7, and 8).
When the stem is in second speed ratio position
(Figs. 9 and 10) and the plunger I25 is in clutch
released position as in Fig. 11, fluid under pres
sure flows into valve chamber II1 and thence
through passage I5I and cylinder port “3 into
cylinder I04 in rear of piston I01 whereupon the
piston I01 is thrust forwardly to shift the sleeve
61 to direct drive position.
At the same time the
travel of the piston. I01 to the position shown in
Fig. 9, which movement of the piston is freely per
mitted because both ends of the cylinder I04 are
vented, the stem I I5 of the main control valve
being locked in neutral position by plunger I29 as _
illustrated in Fig. 8.
Movement of the piston rod I08 rearwardly '
effects corresponding rearward movement‘of the
valve ‘rod II9 through the intermediary of the
forward portion of the cylinder is vented through 10 arm IIO and'the collar I24; Inasmuch as the
port II2, passage I45, port I46, chamber IIB, port
stem I I5 is locked against movement by the
I49 and port I44, vent port I48 being covered by
plunger I29 the stem itself does not move and
the forward head of the valve stem. “
the springs I2I and I 22 are placedunder co Similarly when the stem H5 is thrust for
wardly to high or direct drive position (not illus 15 Release of the clutch pedal 52‘tothereby engage
pression.
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'
trated) vent port I49 is covered by the rear head
of the stem and chamber H8 is opened to pres
clutch B will new result in the vehicle being
driven forwardly in second or intermediate speed
sure port I56, which is thus connected to the cyl
ratio and, as soon as the plunger I25 is returned
inder by way of passage I45. At the same time
to clutch engaged position, springs I2I and I22
the rear end of the cylinder is vented through 20 act to thrust the valve stem II5 rearwardly to
passage I5I, chamber .I I1, port I48 and passage
the position shown in Fig. 10 which actioncon
I41.
nects the- rear end of cylinder I04 with pressure
The operation of the apparatus is as follows: It
port I56 through the intermediary of chamber
will be noted that the power actuated shift mech
II1, passage I5I and port II3, while at the same
anism is effective for shifting the sleeve 61 only,
time the forward end of the cylinder is vented
the low-reverse drive gear 64 being shifted manu
through port H2, passage I45 and chamber I I8
ally in conventional manner.
which is connected to the vent passage I44
Let it be assumed that the vehicle is at rest
through port I49. So long as the plunger I25 is
with engine A running and the regular manually
in clutch engaged position, as illustrated in
operable remote shift control lever in neutral 30 Fig. 10, there is no pressure on in the cylinder
position, the clutch pedal 52 being ‘in clutch en
I04 because pressure port I53 is blanked off by the
gaged position as illustrated in Fig. 1. In order
plunger I25.
'
1
to drive the vehicle forwardly the driver depresses
After acceleration of the vehicle in intermediate
the clutch pedal 52, to the full extent of its travel ' speedratio to predetermined desired speed, shift
which action disengages the clutch B and through
to high or direct speed ratio is accomplished by
the action of the link I35 the plunger I25 is thrust
power actuation in response to depression vof
rearwardly to the full extent of its travel as illus
clutch pedal 52 sufficiently to disengage clutch B
trated in Fig. 8. Rearward movement of the
and move rod I 34 rearwardly to the positionillus
rod I34 to the position shown in Fig. 8 effects
trated in Fig. 11. As soon as plunger I 25 is moved
movement of the collar I31 in a rearward direc 40 rearwardly sufficiently to establish communica
tion su?iciently to close the inlet passage I53
tion between port I53 and passage I54 ?uid under
. thereby preventing the pressure fluid from enter
pressure flows through passage I55 and port I50
ing the main control valve. During operation of
into chamber II1 and as this chamber is con
the vehicle under normal driving conditions,
nected to the rear end of cylinder I04 piston I01
when the power actuating shift mechanism is 45 is immediately thrust forwardly to shift rail 82
effective, the clutch 52 is depressed only enough‘
and clutch sleeve 61 forwardly to clutch the teeth
to release the drive through clutch B when shift
thereof with clutch teeth 68 thereupon estab
ing by the power means and this movement of
lishing direct drive connection betweenvshafts 55
the clutch pedal is not suf?cient to displace the
collar I31 which is retained in the position shown 50. It will be noted that the forward stroke of the
in Fig. 7 by the detent mechanism I 38 at all times
piston I01 takes place during release of the clutch,
and
65.
-
-
.
.
'
except when the transmission is shifted manually,
plunger I 20 under these circumstances ‘locking
under which conditions the clutch pedal is de
the stem against movement which results ‘in
pressed to the full extent of its travel to thereby
springs IZI, I22 being placed under compression
displace the collar I31 and prevent the pressure, 55 through movement of the rod I I9 forwardly" Re
fluid from entering the main control valve.v
lease of the-clutch pedal will now cause the .ve
While the clutch pedal 52 is depressed to the
hicle to‘be driven forwardly in direct drive and
full'extent of its travel as aforesaid, the transmis
as soon as the plunger I25 is returned to clutch
sion remote shift mechanism may be manipulated
engaged position thereby releasing detent plunger
to shift the gear 64 into mesh with the counter 60 I28, the stem I I5 will be thrust forwardly by the
shaft cluster gear 62 thereby to set the transmis
action of the springs» I2I, I22 to connect the
sion mechanism for forward travel in low speed
rear end of cylinder I04 to vent passage I “and
ratio upon engagement of clutch B. Inasmuch
connect the forward end of cylinder I04 to pres
as the position of gear 64 is controlled by rail 83,
sure port I56 as will be readily understood from
the piston I01 of the shifting motor is not dis e5 the drawing.
’ 7
turbed. Release of clutch pedal 52 and depres
'Thus it will be ‘seen that the next time that ‘
, sion of the accelerator pedal I52 will now cause
clutch pedal 52 is depressed, piston I 01 will be
the vehicle to be driven forwardly in low speed
shifted rearwardly of ‘ cylinder I04 therebyto
ratio and when‘ the vehicle has been accelerated
effect shift of clutch sleeve 01 back, to second
to desired speed, shift to second speed ratio may '76 speed ratio position, no manual actuation of'the '
be accomplished manually by depression of the
shift mechanism being necessary.
clutch pedal 52 to the full extent of its travel
and manipulation of the‘remote shift mechanism
This action effects rearward
a
choice of gear and axleratios to start'thevehicle ‘
to shift the sleeve 61 rearwardly into‘mesh with
clutch teeth 69.
_
It has been foundperfectly- feasible with proper
75
in second speed ratio; ,low- speedratiobeingre
served for emergency starts and for negotiating
2,404,330
\
3 driver wishes to drive the vehicle forwardly under
inormal ‘driving conditions shift of the .clutch
;sleeve 61 is entirely .automatic in response to
'8
said clutch whereby said follower member‘ may
.st‘eep grades, sand, ‘snow, etc. v.Eio long as the
be locked against operation incidentally to open
,ationof said clutch.
2. In a motor Vehicle having an engine,‘ a
clutch and a change speed transmission, a shift
v operation of clutch pedal '52. For example, when
the vehicle is brought to a stop at atra?ic light,
depression of clutch pedal 52 will result in the
member in said transmission adapted to be shift
ed from neutral to a low speed drive position and
to a high speed drive position; a pressure ?uid
sleeve 61 being shifted rearwardly to second speed
position preparatory to starting the vehicle in
actuated motor for shifting‘said member include '
this speed ratio upon re-engagement of the clutch, 10 ing, a reciprocable piston operatively connected
to said member so as to cause the transmission to
‘ and as soon assu?icient speed has been obtained
be in the low speed drive position in one position
of the piston and to be in the high speed drive
7; action of the power mechanism being entirely, ' position in another position of the piston, a con
1 automatic with the valve stem I I5 being auto-v 15 trol valve for controlling said motor; means op- I‘
_ erably interconnecting said piston‘ and said valve
matically set for shift of the piston I0‘! in the
whereby said valve is moved to high speed posi
opposite direction upon subsequent depression
tion in response to movement of said piston to
of the clutch pedal.
low speed position and to low speed position in
It will be understood that the clutch pedal must
response to movement. of said pistonto high speed
i be depressed only sufficiently to establish com“
position; . said’ interconnecting means ' including
‘munication between port I53 and passage :54
a lost motion connection operable to permit
during automatic operation of the transmission,
movement of said piston in advance of corre
I full depression of the clutch pedal to the Fig.’ 8
sponding movement of said valve; and means op;
position being made only when manual manipu~
erable by the driver for locking said valve against
lation of the transmission is desired. The detent
movement during movement of said piston.
1 I38 acts to maintain the collar I31 in inoperative
a depression of clutch pedal 52 will result in the
sleeve 61 being shifted to high speed position, the
position except when the clutch pedal is depressed
to its full extent. For this reason it is preferable
3. In a motor vehicle having an engine, a
clutch and a change speed transmission, a shift
member in said transmission adapted to be shift
that the spring controlling detent I38 be made
. sufficiently strong so that the. driver may be able 30 ed from neutral to a low speed drive position and
to a high speed drive position; a ‘pressurei?uid
actuated motor for shifting said member include
ing, a reciprocable piston operatively connected
I to feel the, extra resistance necessary to effect
1 movement of'the collar I31. ' Reverse, setting of
.j the transmission is effected in conventional man- _
to said member so ‘as to cause " the transmission
I ner'by manual manipulation of the remote shift
bein the low speed drive position in one posi
mechanism, the clutch pedal 52 being depressed 35 to
tion of the piston andto be in the high speed
fully to cut off communication between port I53
drive position in another position of the piston‘,
a control ‘Valve for controlling said motor; means
operably interconnecting said piston and‘ said
. will be readily understood.
valve whereby said valve is moved to high speed
It may thus be seen that we have provided a 40 position in response to movement of said piston
‘ simple and fool-proof power actuated mechanism
to low'speed position and to low speed position
1 and passage. I54 while the gear $64 is being shifted ‘
I into‘ engagement with reverse idler gear I86 as
‘ which may be easily applied to a standard trans—
in response to movement of said piston to high
speed position; said interconnecting means in;
cluding a lost motion connectionoperable to per
mit movement of said piston in advance of corre
sponding movement of said valve; and means op
erable in response to release of said clutch" for
mission for shifting the same between second
speed and high speed positions for normal for
ward driving. Our improved power shifting
‘ mechanism does not interfere with the ordinary
3 manual control of the transmission which may
‘ be resorted'to at any time, it being necessary only
7 locking said valve against movement.
to depress. clutch pedal 52 sufficiently to move 50 ‘ 4. In a motor vehicle having an engine, a,
‘ the collar I31 rearwardly to blank off the pres
clutch and a change speed transmission, a shift
member in said transmission adapted to be shift
ed from neutral to a low speed drive position and
. sure port I53 when it is desired to shift either ,
the gear BI or the clutch sleeve 61 manually.
While but one preferred embodiment of our ,
to a high speed drive position; a pressure'?uid
Q invention has been illustrated for purposes of dis» 55 actuated motor for shifting said member includ
' ‘ closure, it will be understood that various changes
. may be resorted to by thosev skilled in the .art ,
mg, a reciprocable piston operatively connected
to said member so as to cause the transmission to
. without departing from the principles'of ‘our in
be in the low speed drive position in one position
of the piston and to bein'the high speed drive
60 position in another position ‘of the piston, a con
1'. In a motor vehicle having an engine, a
trol valve for controlling said motor; means op
clutch and a changespeed transmission; a pres
erably interconnectingsaid piston and said valve
sure ?uid actuated‘motor for controlling said
whereby said valve is moved to high speed posi
‘ transmission so as to cause the transmission to
tion in response to movement of said piston to
drive atone speed ratio in one position of the ‘ 65 low speed position and to low speed position in
motor and to drive at another speed ratio in an
response to movement of said piston to high speed
other position of the motor; a valve for control
position; said interconnecting means including a ,
;
vention.
,
'
'
r
ling said motor including' leader and follower .
lost motion connection operable to permit'move
members so arranged that said leader member
mentv of said piston in advance ofv corresponding
may be operated in advance of said follower
movement of said valve; a master valve for con
member, operation of said follower member caus ‘70 trolling admission of pressure fluid to said con
said
motor;
means
operably
con‘
ing operation of
trol valve; and means operable in response to re‘
necting said leader member with said motor‘
lease of said‘ clutch for'simultaneo-usly operating
whereby said‘leader member is operated in re
said-master valve ‘and locking said 'controltvalve
pr- sponse to operation of said motor, and means
' operably connecting said follower member with
75.
against
movement.
-
V
'
'
'
'
-
'
a
I
2,404,330
9
5. In a motor vehicle having an engine, a
clutch and a change speed transmission, a shift
member in said transmission adapted to :be shift
ed from neutral to a low speed drive position and
to a high speed drive position; a pressure ?uid
actuated motor for shifting said member includ
ing, a reciprocable piston operatively connected
10
and arranged such that it is closed when said
clutch is engaged and open when said clutch is
released; lock means operably associated with
said control valve for locking the same against
movement during movement of said piston, and
means for operating said lock means in response ‘
to release of said clutch.
8. In a motor vehicle having an engine, a
clutch and a change speed transmission, a shift
tion of the piston and to be in the high speed 10 member
in said transmission adapted to be shift
drive position in another position of the piston,
ed from neutral to a low speed drive position and
a control valve for controlling said motor; means
to a high speed drive position; a pressure ?uid
to said member so as to cause the transmission
- to be in the low speed drive position in one posi
operably interconnecting said piston and said
actuated motor for shifting said member includ
valve whereby said valve is moved to high speed
position in response to movement of said piston 15 ing, a reciprocable piston operatively connected
to said member, a control valve for controlling
to low speed position and to low speed position
said motor; means operably interconnecting said
in response to movement of said piston to high
piston and said valve whereby said valve is moved
speed position;said interconnecting means ;in
to high speed position in response to movement '
cluding a lost motion connection operable to per
of said piston to low speed position and to low ,
mit movement of said piston in advance of corre
speed position in response to mo-vement'of said
sponding movement of said valve; and means
piston to high speed position; a master valve for
connecting said control valve with said clutch
, controlling admission of pressure ?uid to said
operable to lock said control valve. against move
ment when said clutch is released.
control valve including inlet and outlet ports and
_
a plunger operably connected to said clutch for‘ '
6. In a motor vehicle having an engine, a 25
operation when said clutch is released to establish
clutch and a change speed transmission, a shift
communication’ between said ports; a pedal for
member in said transmission adapted to be shift
controlling said clutch and master valve, said
ed from neutral to a low speed drive position and
to a high speed drive position; a pressure ?uid
pedal having a normal range of movement for
releasing said clutch and opening said valve and
actuated motor for shifting said member includ 30 a further range of movement overtravelling'said
mg, a reciprocable piston operatively connected normal range and means operable in’response
to said member, a control valve for controlling
said motor; means operably interconnecting said
piston and said valve whereby said valve is moved
to high speed position in response ‘to movement
of said piston to low speed position and to low
speed position in response to movement of said
to operation of said pedal in said overtravelling '
range for cutting off communication between
said ports.
9. In the combination set forth in claim 8,
‘7 means adapted for operation by the master valve
plunger when the same is moved to openposiJ
piston to high speed, position; said interconnect
tion for locking said control valve against move
ing means including a, yieldable member oper-i
ment.
able to permit’ movement of said piston in ad 40
10. In the combination set forth in claim 8,
vance of corresponding movement of said con
means adapted for operation by said pedal for
trol valve; a master valve operably connected
locking said control valve against movement
‘with said clutch for controlling admission of ' when said pedal is operated in both ranges of
pressure ?uid to said control valve, said master
valve being constructed and arranged such that 45
11. In a motor vehicle having an engine, a
it is closed when said, clutch is engaged and open
clutch, a pedal for controlling said clutch ‘and
when said clutch is released; and means inter
a change speed transmission, a shift rail in said
movement.
connecting said valves for preventing movement
of said control valve when said master valve is
open.
‘
7. In a motor vehicle having an engine, a
‘
g
,
~_
-
.
transmission adapted for shifting from neutral
to low and high speed driving positions respec
50 tively; a hydraulic motor for shifting said rail
including a piston and a piston rod operably
connected to said rail; a control valve-for con
clutch and a change speed transmission, a shift
member in said transmission adapted to be shift
ed from neutral to a low speed drive position and
' trolling said motor including a movable valve
member operatively connected with said piston
to a high speed drive position; a pressure ?uid 65
rod and so arranged that movement of said piston ,
actuated motor for shifting said member includ
ing, a reciprocable piston operatively connected
to high speed position urges said valve member to
low speed position and vice-versa; a master valve ‘
to said member, a control valve for controlling
for controlling admission of pressure ?uid to said
said motor; means operably interconnecting said
control valve, said master valve including a mov
able plunger operably connected with said clutch
pedal for operation thereby and arranged such
piston and said valve whereby said valve is moved
to high speed position in response to movement
of said piston to low speed position and to low
speed position in response to movement of said
that operation of said pedal to release said clutch
closes said master valve; and lock means oper
piston to high speed position; said interconnect
ably associated with said valves for locking said
ing means including a yieldable member operable
to permit movement of said piston in advance of
corresponding movement of said control valve; a
control valve member against movement in re
sponse to operation of said plunger accompanied
by release of said clutch.
master valve operably connected with said clutchv
for controlling admission of pressure ?uid'to said
control valve, said master valve being constructed
'
» -
DAVID A. WALLACE.
770
EDWARD 0. LEE.
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