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Патент USA US2117852

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f y¿May 17, 193s.
2,117,852
w. J. PEARMAIN
HÉDRAULICALLY O/PERATED REVERSING MECHANISM
iîned N0v..18, 1955
» 7 sheets-sheet 1
May _17, 1938.
w. J'. PEARMAIN
`
2,117,852
HYDRÁULICALLY CPERÁTED REVERSING MECHANISM
Filed Nov. 18, 1935
'7 Shefâ'bS-Sheet 2
//5
ff
_ I May 17,11938.
w. .LPEARMAIN
4'
2,117,852 '
HYDRAULICALLY OPERATED REVERS ING MECHANISM
Filed Nov. 18,1935
'7 Shee‘bS-Shee'b 5
1,77
May 1_7, 1938.
w. J. PEARMAIN
2,117,852
HYDRAULICALLY OPERÀTED REVERSING MECHANISM
Filed Nov. 18, 1935
7 Sheets-Sheet 4
~
May 17, 1938.
I
w_ J, PEARMMN
2,117,852
HYDRAULICALLY OPER’ATED ÈEVERSING MECHANISM
`
‘ @y
'l
Filed-Nov. 18; 1955
7 :amas-sheetl 5
‘
May.17, 1938.
l
w. J. PEARMÀIN
_
2,117,852
HYDRAULICALLY -OPERA'ÑED REVERSING MEGHANISM
Filed Nov.- 18, 1935
7 Sheets-Sheet 6
80
615
l2,117,852
Patented May 17, 1938
UNITED >'s1-Arcs PATENT `¿OFFICE
2,117,852
mmmomy oPEnArEo nsvsnsnvc
-
nmonmsm
.
william J. Femm. mme, wis., asumir to
Twin Diso Clutch Company, Bacine, Wis., a
corporation of Wisconsin
‘
Application .November 13, 1935, Serial No.. 5&2?!
(ci. lcs-sv)
il
My invention relatesto a. reversing mechanism
provided with an improved clutch device and ac
tuating means therefor for effecting a transmis
sion of power between driving and driven shafts
and is more particularlyconcerned with a mech
anism of this character for marine service.
ln marine power installations, particularly
those employing internal combustion engines, it
is necessary _to step down the revolution speed
10 of the engine to a point that is satisfactory for
the eiilclent operation of the propeller.
Ordi
narily this reductionls effected through a sult
able arrangement of gearing which includes a
reversing device. The reduction features ci this
invention, however, may be omitted wherever de
sired, as it simply constitutes an ancillary phase
oi my improved device.
Se i'ar as the arrangement ofgears and revers
ing clutches is concerned, the disclosure ci the
arrows, the clutch actuating mechanism -being
illustrated in neutral position.
_
Fig. 3 is an enlarged sectional view, correspond
ing to a portion of Fig. 2, showing the reversing
clutches in neutral position and the manually
controlled, hydraulically actuated mechanism for
operating the clutches;
_
Fig. 4 is a view similar to Fig. 3, but showing
the hydraulic mechanism shifted to a position
for Yengaging the forward drive clutch.
10
Fig. 5 is an enlarged, sectional elevation of the
oil pump, as viewed in Fig. 2.
-
Figs. c, 7 and t are sections along the lines 6_6,
l--l and
, in Eig. 5, looking in the direction
of the arrows, and
uw» in detail, structural l15
features oi’ the oil pump.
Fig. s is a sectional view taken along the line
in Fig. d, looking in the direction ci the
arrows, and showing the port plate for- the oil
present application is substantially identical with
pump.
those ci’ my eopending applications, Serial Nos.
70;?,093 and 720,677, ñled January it, lille, end
April lt, lg3d, respectively. ln each of these
reciprocating valve for the hydraulic mechanism,
mechanisms,v ` however, the spring-actuated
25 clutches were engaged and disengaged hy man
3, the hydraulic cylinder of the hydraulic mecha
nl
and the oil pump being shown in simple
20
ual operation, but this arrangement ls
satis
factory for high capacity units, because of the
hand eíiort required.
-
lt is therefore one object of my invention to
30
provide a hydraulically operated reversing :mechu
anism in which’the control ls manual and the
reversing clutches are thrown into and out or
engagement hy hydraulic pressure established by
a pump' connected to the principal shaft oi’ the
mechanism which is driven by the main power
source.
-
A further object is to devise a mechanism ot'
the character indicated which is sell-contained
in respect of lubrication and in which the lubri»
eating oil is pumped through o. circuit arranged
to accommodate the lubricating requirements ci’
the mechanism and which includes devices that
are actuable by the oil pressure to operate the
reversing clutches.
_
These and further objects oi my invention will
be set forth in the following speciñcation, reifer
ence being had to the accompanying drawings,
and the novel means 'cy which said objects are
ericctuated will “ce deñnitely pointed out in the
20
rug. io is c. plus new, partly in section, of the '
.
‘
'
as viewed in the direction of the arrow lll in Fig.
plan view beneath the valve.
_
Fig. ll is a diagrammatic view, partly in sec
tion, showing the oil circuit which is utilized to
lullr’icate the mechanism and which forms an
important part ci the hydraulic control therefor. 30
Referring to
2 and 3, the numeral ill des
ignates a
it which may be considered as the
main power source und which has a flywheel il
attached 4to the end thereof. The flywheel has holted to its right face, as viewed in Fig. 2, an 35
internally toothed ring lil which meshes and
therefore has driving connection with a similarly
toothed spider it that is mounted on the left
extremity oi' a. driving shaft it and rotates there
with. “iler the purpose oi description, the shaft 40
it will he regarded as the driving shaft of the
reversing mechanism. This shaft extends across
the interior ol.’ housing it and it is intermedi
ately provided with an enlarged, splined portion
it (see Fig. 3l which has fitted thereon a pair 45
oi drums'l‘l and. iti whose open ends 'ia-ce in opw
lsite directions. These drums are fastened to
gether by screws it in order to provide - common,
shiitalole member which is adapted for axial
movement along the portion lll, but partalres of
ln vthe drawings:
the rotary movement of the shaft it.
The drum il carries e. plurality of iixeddiscs
Figure l is anend View of the mechanism, as _
t’il 'which are arranged in alternating relation to
viewed inthe direction ofthe arrow'i in Fig. 2.
claims.
_
-
'
Fig. 2 is a sectional elevation taken along the
line 2_2 in Fig. l, looking in the direction of the
a piurality’of similar disks il supported on a
huh 22. This huh is provided with an annular, 55
2
_ 2,117,852
ñange-like portion 22a between which and the trunnions 41. respectively, and the lower end of
opposite face of the- drum I l', the discs 20 and' each arm is bifurcated as at 4l! to embrace a block
2I are adapted to be clamped in order to provide
the forward drive clutch of the mechanism. The
being conveniently mounted in the wall of the
hub 22 is freely rotatable at its right end on a
housing.
ball bearing 23 and adjacent the splined portion
I6 upon a ball bearing 24, the inner races of the
bearings 23 and 24 ñtting closely the adjacent
portions of the shaft I4. Adjacent the bearing
10 23, the periphery of the hub 22 is formed as
a pinion 25 by directly cutting the teeth thereon,
or a separate vpinion may be keyed or otherwise
secured to the hub 22. The pinion 25 (see Fig. 2)
meshes permanently with an internal gear 2t
15 that is fastened to a driven shaft 2ï which pro
Fig. 3, these clutches occupy neutral or non
driving positions. -
The foregoing structural features of the for
ward and reverse drive clutches and the asso-1
connected to a propeller or other type of shaft.
elated gearing are substantially ‘identical with
those disclosed and claimed in the aforesaid pend
ing applications. The present invention essen
tially diñers _from the latter in the hydraulic gear
provided for actuating the clutches and this
above, or to one side of, the axis of the shaft 2T,
20 thereby providing space for an additional pinion
to transmit a reversing drive to the shaft 2l,
as hereinafter described.
A thrust bearing 23 encircles the hub 22 with
its inner race iitting closely around the hub and
25 abutting against a shoulder 28a provided thereon.
The outer race of the same bearing is ñrredly re
tained Within a cage 29 that is provided on a web
Sil which extends upwardly from the bottom of
the housing l5. The bearing 2d, therefore, not
30 only resists a portion of the thrust of the mecha
nism during direct drive, but it also operates as
a support for the right end of the driving shaft
i4, the support operating through the hub 22 and
the bearings 23 and 2li.
The drum i8 also supports a plurality of fric
tion discs 3l which are arranged in alternating
relation to a plurality ofl friction discs 32 that are
carried by a hub ¿it and these last named discs are
adapted to be clamped between an annular iiange
40 33B' provided on the hub 33 and the adjacent
face of the hub lil, thus constituting the reversing
clutch of the mechanism.
¿ls with the direct
drive clutch, the hub 33 is freely rotatable upon
the outer races of ball bearings Sid and 35, Whose
45
The upper ends of the arms 48 are
pivotally connected to stub arms 52, respectively,
which project laterally in opposite directions from
a link $3 (see Fig. 3) whose movements to and
fro, as hereinafter described, eiîects a rocking of
the arms 48 on their respective pivots to thereby 10
throw either of the aforesaid clutches into en
gagement. In the relative positions shown in
jects without the housing l5 and may be suitably'
As shown in Fig. 2, the pinion 25 is disposed
35
Sli that is freely rockable on a pin 5I, the latter
is
inner
ñxedly
races
mounted
snugly on
ñt the
the shaft
hub @illil.so as
A pinion
to rotate
therewith and this end of the shaft Eil is sup`a
ported by means of a thrust bearing 371, similar to
. the bearing 23, whose inner race snugly ñts the
50 periphery of the hub t@ and abats against a
shoulder 37a provided on the same hub. The
outer race of the same bearing is iixedly retained
within a cage 38 forming a part of a web 3S which
extends upwardly from the bottom of the housing
55 I5.
The bearing Eil serves asï'fa support for the
left end of the driving shaft lli, in'addition to
taking a portion of the thrust of the mechanism
during reverse drive.
The pinion 36 is in constant mesh with a gear 4@
60 ñxedìy attached to one end of a counter-shaft ¿il
' that is rotatably mounted in bearings d2 and 43
that are carried in the webs 3@ and 3S, respec
tively. The opposite end of the shaft 4i has
iixedly connected thereto a pinion 4d that is in
65 permanent mesh with the internal gear 26 and
located on the opposite side of the axis of the
shaft 21 from the pinion 25.
The inner race of a ball bearing 45 is clamped
between the adjacent faces of the drums il _and
70 I8 by the screws I9 (see Fig. 3) and encircling
and ñxedly connected to the outer race-of the
same bearing is a yoke 46 which is provided with
a pair oi?` laterally extended trunnions 4l which
project from opposite sides thereof (see Fig. 1).
A pair of arms 48 are pivotally mounted on the
mechanism will now be described.
15
`
Referring to Figs. 2, 5, 6 and '7, the left end 54
of the housing l5, as viewed in Fig. 2, is counter»
bored where the shaft lll extends therethrough 25
and a closure plate 55 is seated in the bottom of
this counterbore. A. pump chamber ring 5t is
also closely iitted in the counterbore and is pinned
to the ring 55. The 'inner diameter of the ring
5t is somewhat greater than the diameter of the
shaft lil and the bore of the ring is eccentrically
located with respect to the shaft, the center oi‘
the bore being located a short distance below the
center of the shaft,'as clearly .indicated in Fig. 7,
for a. purpose hereinafter explained.
A pump
rotor 5l is drivably connected to the shaft I4 and
the left face thereof, as viewed in Fig. 5, closely'
ñts the adjacent face oi the ring 55.
A plurality of ‘radial slots 53 are cut inwardly
from the peripheral face of the rotor iii and a
vane 5d is freely slidable in each of these slots, so
that when the pump rotor is operating, each oí
the varies will be moved outwardly into contact
with the bore of the chamber ring lit. As clearly
indicated in Fig. ‘7, the eccentricity of the bore »
of the ring et, in conjunction with the pump
rotor, defines suction and delivery chambers t@
and (il, respectively. The chamber @E is in com
munication with an intermediate chamber 62
having the parti-annular shape indicated in Fig.' 50
6 and which is located in a cover plate @3 that is
securely held to the housing end 54, the pump
rotor operating between this cover plate and the
ring 55. The intermediate chamber t2 communi
cates through a suction port 54, also formed in the 55
cover plate t3, and one end rof a suction pipe GE‘
is in communication with this port, the opposite
end of the pipe terminating in thev lower end of
the housing l5 and specifically in a reservoir por‘
60
tion thereof, as hereinafter described.
The delivery chamber 6I of the pump com
municates with a second intermediate chamber
66, also of parti-annular shape as indicated in
Fig. 6, and which is also formed in the cover
plate $3. |li'he chamber 66 communicates with a 65
delivery port El' within which is mounted one end
of a delivery pipe 68 whose opposite end is
mounted in the wall of a valve housing 69 so as
to deliver iiuid into the interior of this housing.
(See Fig, 10.)
_A piston valve 'l0 is reciprocably mounted in
the housing B9 and is provided with piston por
tions liand ’I2 which are spaced and connected
by a~neclr 13 that defines with the valve housing
a receiving chamber 74 which is in communica 75
3
2,117,852
operate the hydraulic gear above described, be
tion with the delivery end of the pipe 68. As illus
trated in Fig. 3, the piston valve l0 is occupying
tween the faces of the clutch discs when-they are
,a neutral position and completely masks ports .
inÄthe separated condition illustrated in Fig. 3,`
'I5 and 16 which are located adjacent the opposite
ends of a cylinder 11. A piston 18 is reciprocably
mounted within the cylinder and its piston rod
19 projects outwardly through a cover plate 8i)
that closes the indicated end of the cylinder and
lthe extremity of the rod has aiiixed thereto a
or when either clutch is disengaged.
The axial hole |05 continues to the right ex
tremity of the driving shaft, so that the lubri
cating oil may be thrown from ther end I I0 there
of onto the internal gear 2t. The oil which es
10 connector part 8|A which is pivotally attached to
capes from the end of the driving shaft ultimately
is collected in a reservoir iii provided in the 10
bottom of the housing i5 and free movement of
the adjacent end of the link 53 so that, when the
piston 18 is moved in either direction, a corre ‘ this oil from the ends of the housing through the
sponding rocking movement of the levers H8 is
effected.
15
'
One end of a link 82 is also pivctally connected
to the part 8| and one end of a link 83 is pivotally
connected to an intermediate portion yof the link
82, and the opposite end of the link 83 is pivoted
in the valve rod 84. The other end of the link 82
20 is pivotally connected to one end of a link 85 and
the opposite end of the latter link is pivotally
connected to a lever 86 that is fixedly mounted
on a rock shaft 81 suitably journaled in the hous
ing I5 and which extends outwardly thereof for
25 aiî?xation to an operating handle 88. Accord
ingly, when the handle 86 is rocked forwardly or
rearwardly, or toward the left or right, respec
tively, as viewed in Fig. 2, the piston valve 'Hl will
be moved accordingly, but without moving the
piston lt.
webs 39 and 30 is permitted by passages H2 and
H3, respectively.
`
-
Referring to Fig. 10, the exhaust of the iluid
, chamber 'M is provided by a port »89 formed in the
wall of the valve housing and which terminates
in a valve seat 90 that is adapted to be engaged
and to thereby close the port t9 by a valve 9i.
rll'his valve operates in a housing extension 92
.Whose open end is closed by a plug d3. An ad
justing screw at is threaded through theplug @i
‘and the inner end thereof engages a spring plate
40 di?. One end of a coil spring il@ bears against the
plate [iii and the opposite end against the valve
iii. By suitably choosing the spring @it and ap
propriately adjusting lthe screw 9d; any desired
pressure may be set up in the yvalve di ,and when
45 this pressure is exceeded by a rise in pressure in
’
The operation of my improved reversing mech
15
-anism will now be described.y Referring to Figs.
2, 3 and 4, it Will be assumed that the shaft i0 `
is rotating at some determined speed, which ro
tation is in turn transmitted to the driving shaft
I4 by the spider i3, and that the shifting arms 20
4B occupy the neutral position shown in Fig. 3.
In this position of the-indicated parts, it will be
noted that, while the clutch drums il and i8 `
are rotating with the shaft N, the shifting arms
48 and the parts which operate the same permit 25
this rotation by reason of the association of the
yoke it with the outer race of the ball bearing 65.
If now itis desired to transmit a direct or for
ward drive to the driven shaft 2l, the hand lever
88 will be rocked toward the left, as viewed in 30
Fig. 2, which movement would be forward'with
respect to the position of the reversing mecha
nism in a boat, for example. This movement of
the lever 83 will accordingly shift the piston valve
'it toward the left, as viewed in Fig. 3, and sub
stantially to the dotted position indicated in Fig.
i, the intermediate linkage also assuming the
dotted position shown in the same iigure. Because of the pivotal connection of the link d2
'
with the part di, the aforesaid movement oi the [Mi
hand lever d@ does not aiiect the piston it.
The piston valve iii being shifted toward the
left, as just stated, the piston portions “it and ‘iii
uncover the ports ‘i5 and it, respectively, so that
oil under pressure as established by the pump 45
the fluid chamber it, iluid will escape through rotor el] will pass through .the connecting pip'e,
the port t@ into an exhaust pipe iii, one end of ports and passages’into the duid chamber llt' and
which is mounted in the housing extension 32 and thence through the port ‘iii into the chamber itil
is in communication with the interior thereof.
to the leit oi the piston liti. lit ‘wiil be under
The exhaust pipe di passes through a wall of stood that up until the time that the piston valve 50
the housing it and thence through a cooler 9d of 'itl is shifted, lubricating oil is being raised through
any appropriate design and through which cool
the pipe te by the oil pump and then delivered
ing. water may be circulated by -ineans of the . to the pipe titi, from which it passes through the
pipes 99.. A return pipe Hilti leads from the cooler duid chamber 'it in the valve housing tit and, be-n @il and its delivery end is mounted in the cover cause of the pressure established, the valve @i
plate tiä'and is in communication with a port tdi, is unseated, thus permitting the uninterrupted
also provided in this plate (see Figs. 5 and 6). dow oi the oil through the pipe ill?, cooler 9d, pipe
Fluid passing through the port Mii is discharged
into‘an annular chamber lili, also provided in
the cover plate, and which encii'cles the driving
shaft itl (see Figs. 5 and 6). ¿i radial passage it@
is drilled in the shaft iti, the outer end oi this
passage registering with the chamber tilt? and
the inner end with an axial hole idf-’i that extends
the length of the driving shaft iii.
The left end of the passage'iilíi is` closed by _a
plug itil), so that iluidintroduced into the passage
must move toward the right. Similar radial pas
sages lilë and till! are provided in the driving
shaft, the inner ends of these passages being in
`communication with _the arial passage Miti and
the outer ends registering with passages idd and
lila provided in the hubs ¿t3 and 22, all respec
tively. lBy this means, it is possible to deliver
lubricating oil, which is the ñuid employed to
it@ and thencethrough the axial passage it@ to
the internal gear it, and then to the .reservoir i il i .
However, when the piston valve l@ is shifted 60
toward the left, a relief ior this oil ñow'is per
initted 'oy the passage oi‘ the oil into the chamber
iiéi and the ensuing reduction in oil pressure on
the valve iii either permits this valve to close en
tirely or to partially close, dependent upon the
setting of the spring tit.
The oil that is delivered into the chamber iifi
moves the piston 'it toward the right, as viewed
in Fig. 3, thereby throwing the shifting arms tid
in the same direction and throwing into engage
70
ment the forward drive clutch by compressing
the friction discs iii and 2i between the drum il'
and the hub ñange iin.
With the forward drive clutch in engagement,
the drive from the shaft it is transmitted 75
2,117,852
through the ñywheel- Il, spider I3, driving shaft
shaft and is sprayed onto the internal gear for
final collection in the reservoir l l I.
prising the drum l1, friction discs 2li and 2l -and
It will be understood that the nature of ~the
hub 22, which in the present instance also in-- linkage connection between the piston valve ‘I0
chicles the diivingpinion 25 that is in mesh with » and the »piston rod 19, in conjunction with the
the internal gear 26 and thence to the driven movement of the operating lever 8B, is such, that
shaft 21.
'
when the operating handle is moved from the
The piston 18 is moved toward the right by the forward drive position illustrated in Fig. 4 to the
oil pressure until the forward drive clutch is defl lneutral position illustrated in Fig. 3, the piston
nitely in engagement and, at this time, the posi
valve ‘l0 will be moved to a position such that the
tions of the‘piston, piston valve and associated piston portion ‘l2 thereof will communicate the
linkage is substantially as indicated hy full lines ' chamber HE with the fluid chamber lll through
in Fig. fi. In other words, the shifting of the pis
the port lt and will communicate the chamber
ton ‘it has also occasioned a slight return of the
lit with the exhaust opening lll through the
piston valve toward the right, as viewed in Fig. 4, port l5. Oil pressure will accordingly move the
from the dotted line position to which the piston piston ‘lil toward the left, as viewed in Fig. 3, and,
valve had been originally moved loy the hand lever during this movement, the piston valve 'lll-is slow'
8&3. However, this relocating of the piston valve ly movedto the masking position, illustrated in
is not sumcient to rnaslf` the ports 'i5 and lil, so Fig. 3, whereupon the indicated movement of the
that oil under pressure is maintained in the piston 'lil will cesse and the piston will then oc
chamber l it in order to continue the engagement cupy the position shown in Fig. 3. A similar move
of the forward drive clutch. After the required nient occurs when the operating handle is moved
pressure has been established in the chamber lill, from a reverse position to the neutral position.
any excess in oil pressure that may he established
lin order to insure adequate lubrication of the
by the oil pump will be relieved through the re-- pump rotor and the free and positive movement
lief valve il and the oil then passing through the of the venes 59 in their slots, angularly inclined
port 89 will complete the circuit as hereinloefore oil passages llt (see Figs. 8 and 9) communicate
described. ' Moreover, any oil that may have
the intermediate chambers t2 and 66 with parti
originally been in the'chamber IE5 to the right of ennular grooves l i9 and l2@ provided in the face
the piston it, es viewed in Fig. 3, will he exhaust~ of the cover plate ed. The grooves il@ and i2!)
ed through the port ‘it and then through the open are located in a position such that they substan
end il@ of the valve housing 5s. Oil escaping tially register with the inner ends of the slots 58
through the indicated openings simply drips over (see Fig. 5), and. hence oil under pressure main
the mechanism beneath and is finally collected in talus the outward position of the varies, thus
avoiding any necessity for springs.
the reservoir ill.
lf now it is desired to reverse the drive to the
ln the event of the installation of these mech-.
mechanism, the operating handle te will he anisins in craft. provided with twin screws and
rocked toward the right, as viewed in Fig. 2 to eccorly with propeller shafts running in op
thereby move, through the associated linkage, the posite directions, the suction and delivery pipes
piston valve l@ toward the richt, as viewed in Figs.
and e@ would ’oe reversed from the positions
3 and 4i, and. substantially to a position at the indicated in Fig. «3, according to the direction of
opposite end of the housing
corresponding to rotation of the shaft of the engine to which the
that indicated in dotted lines in Fig. t. 'During particules reversing mechanism is connected.
lf the hydraulic gear shouid fail for any reason,
this movement, the chamber liíi will loe placed
in communication with oil under pressure in the it is still possible to operate the mechanism for
chamber ifi through the port lt, while the cham" forward drive lov virtue-of the loar lil which is
her l ifi will he opened to the exhaust through the thresded through en end well E22 of the housing.
port le, es permitted hy the open end lll et the ns illustrsted in Fig. 2, this har is shown as un
left end of the housing @it In other words, the connected to the linlr. 53 and this arrangement
valve position will he exactly the reverse of that is normal, so long as the hydraulic gear is func
tioning. In the event of a failur of the latter,
hereinhefore described.
Accordingly, the piston 'le will he moved. to
however, the linlr 53 is disconn ed from the
ward the left, as viewed in Fig. 3, and any oil that part di and is connected to the adjacent end of
may he in the chamber Ele will he exhausted as the har lil. If the nut i255 is then backed off
aforesaid. The shifting arms ¿itfwill according» sufliciently, rotation of the nut i211 will serve to
ly he rocked toward the left, as viewed in Fig. 3, pull the har liil toward the right and hence
thus throwing into engagement the reversing throw the forward drive clutch into engagement.
A reversing mechanism of the character indi
clutch, as formed _hy the drum iii, friction discs
cated above-xnay he huilt for use in installations
Si and ¿'22 and the hub iiange 33e.
The reverse drive will then occur through the requiring high capacity, because the operating
eñort required to octuate the forward andre
following ports: The ñywheel ll, spider i3, driv
ing shaft it, reversing or left hand clutch, pinion verse clutches is provided by the operation of the
36, gear tu, counter-shaft Lil, pinion (it, and then mechanism itself through the medium of oil pres
through the internal gear it to the driven shaft sure. Moreover, this pressure is created by the
use of a medium which is in turn utilized to lubri
2l.
I4, the right hand or forward drive clutch com
25
.35
45
50
55
60
es
Any iubricating oil that is ’ not exhausted
through the openings llt or lil, dependent upon
the direction ofdrive, is finally exhausted through
70 the relief valve 9i, pipe el, cooler 98, and return
pipe itil, for final passage through the axial hole
I Min the driving shaft. As before stated, some
of the oil passing through this- hole in the driv
ing shaft is sprayed onto the friction discs, while
75 the remainder passes through the end of the
~cate the mechanism as a whole, so that the latter
is a fully self-contained unit(
I claim:
\
g
"Y ì
1. In a. reversing mechanism, the combination
of a driving shaft, a pair of gears freely rotatable
on the shaft, clutches for positively driving either
of the gears, a member shiftable to engage either
clutch, and. hydraulic means for shifting the
member comprising a cylinder, a. double-acting
piston operating in the cylinder and connected
10
15
25
30
45
55
60
65
9,117,852 l
'
of a housing having an'oil reservoir, a driving'
shaft in the housing, a pair of gears freely rotat
pump driven by the shaft, and a pipe connecting » able' on the shaft, clutches for positively driv
the p?mp and valve for delivering fluid under ing either of the gears, a member shiftable to en
gage either clutch, and hydraulic means _for shift
pressure to the cylinder.
2. In a reversing mechanism, the combination ing the member comprising a cylinder having a
of a driving shaft, a pair of gears freely rotatable port adjacent each end, a double-acting piston
on the shaft, clutches for positively driving either operating in the cylinder and connected to thev
of the gears, a member shiftable to engage either member, a manually controlled, reciprocable valve
10 clutch, and hydraulic means for shifting the adapted to mask the ports when in neutral posi 10
tion and shiftable to open the ports to the in
‘ member comprising a cylinder, a double-acting
piston operating in the ~cylinder and connected coming fluid and exhaust, respectively, a pump
to the member, a manually controlled valve for driven by the shaft, a suction pipe connecting
admitting fluid to either end of the cylinder, a. the reservoir and pump, a delivery pipe connect
15 pump driven by the shaft, a pipe connecting the ing the pumpand valve, and means_for return
ing Vthe fluid from the cylinderto the reservoir.
pump and valve for delivering fluid under pres
to the member, a manually controlled valve for
admitting fluid to either end of the cylinder, a
sure to the cylinder, and a release valve in com
y munication with the admission valve adapted to
maintain a constant pressure in the pipe leading
from the pump to the valve.
„
3. In a reversing mechanism, the combination
of a driving shaft,` a pair of gears freely rotat
able on the shaft, clutches for positively driv
ing either of the gears, a member shiftable to
engage either clutch, and hydraulic means for
shifting the member comprising a `cylinder hav
ing a port adjacent each end, a double-acting
piston operating in the lcylinder and connected
to the member, a reciprocableA valve adapted to
mask the ports when in neutral position and shift
able to open the ports to the incoming> fluid and
exhaust, respectively, a pump driven by the shaft,
and a pipe connecting the pump and valve for
'delivering fluid under pressure thereto.
4. In a reversing mechanism, the combination
of a driving shaft, a pair of gears freely rotat
able on the shaft, clutches for positively driv
ing either of the gears, a member shiftable to
engage either clutch, and hydraulic means for
7. In a reversing mechanism, the combination
of a housing having- an oil reservoir, a driving
shaft in the housing' having an axial oil pas
sage and radial oil passages extending therefrom,
a pair of gears freely rotatable on the shaft,
clutches for positively driving either of the gears,
a kmember shiftable to engage either clutch, and
hydraulic means for 'shifting the member com
prising a cylinder having a port adjacent each
end thereof, a manually controlled, reciprocable
valve adapted to mask the ports when in neu
tral position and shiftable to open the ports to
the incoming oil and exhaust, respectively, a
pump housing encircling the shaft and having
suction and delivery chambers, a pumping ele
ment driven by the shaft within the housing, a
suction pipe connecting the reservoir with the
suction chamber, a delivery pipe connecting the
delivery chamber with the valve, and a return
pipe connecting the exhaust side of the valve
with the housing,` said last-named housing con
nection being in communication with a port
formed in the housing and adapted to register
with one of said radial passages, whereby the
oil passing. through the return pipe is delivered
shifting the member comprising a cylinder hav'
ing a port adjacent eachA end, a double-actin
into 'the axial passage, and certain of the other
piston operating in the cylinder and connecte
radial passages being located along the shaft
to the member, a manually controlled, recipro
cable .valve adapted to mask the ports when in ` to discharge oil on the clutches.
8. In a reversing mechanism. the `combination
neutral position and shiftable to open the ports
Ato the incoming iluid and exhaust, respectively, of a kdriving shaft, a pair of gears freely rotat
able on the shaft, clutches for positively driv
a connection between the valve and piston con
structed and' arranged to provide for manual ing either of the gears, a member shiftable -to
engage either clutch, and hydraulic means for
actuation of the valve in either direction inde
shifting the member comprising a cylinder hav
pendently of the piston and an automatic shift
ing of the valve whenthe piston is subjected to ing a port adjacent each end, a double-acting
pressure, a pump driven by the shaft, and a pipe piston' operating in the cylinder’and connected
connecting‘the pump and valve for delivering to the member, areciprocable valve adapted to
mask the ports when in neutral position and
fluid under pressure thereto.
5. In a reversing mechanism, the combination shiftable to open the ports to the incoming fluid
of a housing having an oil reservoir, a driving and exhaust, respectively, a ilrst link pivotally
mounted on the rod of the piston, a second link
shaft in the housing, a pair of gears freely rotat
able on the shaft, clutches for .positively driv-- pivotally connected at its ends to the valve and
ing either~ of the gears, a member shiftable to first link, respectively, vmeans for manuallyl ac
Aengage either clutch, a hydraulically actuated tuating the ilrst link to thereby manually ac
device connected to the member for shifting the tuate the valve in. either direction independently
same, a pump driven by the shaft and having of the piston, the valve being responsive t‘o move
communication with the device for delivering ments of the piston when the latter is subjected
fluid under pressure thereto, a suction-pipe con
-necting the reservoir and pump,4 and means for
returning fluid from the device to the reservoir.
6. In a reversing mechanism. the combination
to pressure, a pump driven by the shaft, and a
pipe connecting the pump and valve for deliver
-ing ñuid under pressurev thereto.
‘
WILLIAM
J. PEARMAIN.
‘
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