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Патент USA US2410511

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v_ Nw. 5, 1946.,
J. ?_ ,_ETSINGER UAL ,
SYNCHRONI Z ING DEVICE
v
Filed Aug. 26, 1944
�mm
Patented Nov. 5, 1946
M
2,410,511 -
irse STATES. Partnr omer.
2,410,511
SYNCHRONIZING DEVICE
John H. Letsinger and Harold F. Foley, )Fort
Wayne, Ind., assignors to International Har
vester Company, a corporation of New Jersey
i
Application August 26, 1944, SerialNc. 551,358
13 claims. (Cl. N92-�)
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2
This invention relates to a synchronizing device ~
for transmissions. Morespeci馽ally, it relates
to a synchronizing device of the energizing type.
synchronizing devices for the transmissions of
Figure l, carries a ball-bearing assembly li in
which a clutch shaft i2 is rotatably mounted.
Said clutch shaft is driven from a conventional
clutch as used with internal combustion engines.
The shaft I2 is provided with a gear I3 which
drives a cluster in the conventional transmission
construction by means of which power may be
transmitted at a different speed ratioV to a gear
It journaled on a power output shaft I5. The
automotive vehicles are now almost universally
used on passenger cars and other light vehicles.'
Such devices have not been generally used' on
heavier transmissions necessary in heavy-duty
trucks and tractors. One of the reasons for` not'
using synchronizing devices on the heavy trans
missions is that the manual effort necessary to
engage friction clutches has beenso great as to
shaft I5 is provided with areduced end portion
I6 rotatably carried on a suitable bearing in a
bore Il formed in the inner end of the shaft I2
within the gear i3.
increase the synchronizing to such an extent that
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The inner end portion of the shaft I2 beyond
undesirable loss of speed is brought about.
The principal object of the present invention 15 the gear i3 is provided with a fianged end portion
i8 which is provided with gear teeth I9 of the '
is to provide an improved synchronizing device
type used for the dental or positivef'clutch. Said
utilizing a self-energizing friction clutch by
end portion ofthe shaft l2 is also provided with
means of which a suiiicient� pressure may be ex
erted on -the synchronizing clutch by very small ' ' a flange 20 provided with a conical clutch face(
20 for cooperating with the mating face of an ele
e�'ort on the part of the operator.
ment of the synchronizing device to be herein
Another principal object is to provide a posi�
after described.
tive means - for retracting the friction clutch
The gear i@ is provided with a flanged portion
whenever desired without completing synchro-`
2l having gear teeth 22 corresponding to the gear
Other objects, including an?improved and slm~ 25 teeth i9 to provide a positive or dental clutch.
The ?gear i6 is also provided with a flange 23
plifled synchronizing unit, will be apparent from
Ahaving a conical clutch face similar to the clutch
the detailed description to follow.
~
face on the 馻nge 20. In synchronizing devices,
in the drawing:
it is common practice to have a double unit using
Figure 1 is a cross-sectional view of a synchro
nizer unit incorporating the invention as utilized 30 exactly the same construction on opposite sides
thereof to facilitate manufacture and to reduce
in a conventional change-speed transmission;
the number of parts required;
7 .
Figure 2 is a fragmentary end view taken sub
The shaft l5 is provided adjacent the reduced
stantially on the line 2--2 of Figure 1;
~end portion I6 with an enlarged end portion 24
Figure 3 is a detail view showing the energizing
providing a shoulder 25 against which an abut
' cams on the friction ring and its driving member;
ment washer 26 rests. The gear 2| in turn abuts
Figure 4 is an enlarged detail face view of o_ne
the washer 2.6, being held against axial movement
of the power transmitting and detent members
nization.
~
-
A
on its journal by a second annular member 21
'of theshifting device;
Figure 5 is a fragmentary end view of a portion
of the shifting member;
Figure 6 is' an inside radial face view of the
shifting member of Figure 5;
f
y
Figure 7 is a detail view showing the relation
40
which is retained in position by a snap ring 28.
The enlarged portion 2t of the 'shaft I5 is pro
vided with a flange � of a substantial width in
an axial direction and of a radius substantially .
greater than the radius of the enlarged portion
ship of the shifting member and the clutch ring 45 2e. As best shown in Figure 2, the flange 29 is
provided around its circumference with gear
in neutral or synchronized position;
Figure 8 is similar to Figure '7 showing the
'relation of the shifting member Lwith respect to
'the clutch ring previous to synchronization.
As synchronizing devices of the type' disclosed
? ' herein are widely used in transmissions of' various
`types and as their installation in transmissions
is well known to those skilled in the art, only a
� synchronizing unit has been illustrated with only '
teeth t@ .to provide for slidably mounting a shifter
member di which is'provided withinternal gear
teeth or splines 32 slidably 駎ting over the teeth
3G. I The teeth 3i) are the same pitch as the teeth
50 i9, whereas the shifting member 3| may be moved
axially into engagement with either the teeth i9
or the teeth 22 whereby a' positive drive may be
transmitted from the shaft l2 to the shaft I5 or
such shaft靚g and gearing beingv shown as are ` from the gear It to the shaft I5.
necessary to illustrate anv operative installation. 55 As shown both in Figure 1 and Figure 2, three
Aptransmission casing wall I0, las shown in ~ circumferentially spaced slots 33 are formed
2,410,511
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around the flange 29 across the face thereof in
an axial direction. In each of these slots a slid
able key 34 is fitted for reciprocating movement
in both axial~ and radial directions.l A spring
35, fitted in a bore 36 extending radially in
wardly from each slot 33, abuts each of the keys
34 urging the key against the inside of the shift
ing member 3|. A tooth of the shifting member
device of this type can be so constructed as to
obtain a very large pressure on the friction
clutch faces with the exertion of a very small
force by the operator on the shifting member 3|.
This is particularly advantageous where largel
heavy transmissions are being operated. Where
there is a large `inertia force to be overcome be
fore synchronization, a silent vshifting can be ac-'
complished.
is cut away, as shown in Figure 2, to provide for
In an energizing synchronizing device as above
the key which is of a width substantially equal 10
described, it is important to provide a means for
to two teeth. Each of the keys 34 is provided
retracting the friction clutch under any condi
with a bore 31 in which a ball 38 is seated. The
tion of operation including any time when syn
bail may be permanently imbedded in the bore
chronization has not been effected. If the cp
as it does not move relative thereto. A project
ing portion of the ball engages a seat 39 formed
eration is continued until synchronization is ef
fected with release of the'detent balls 38 and pos
at the inside of a bore 48 extending through the
itive engagement of the shifting member 3| with_
shifting member 3| and into a. slot 4| in which
the teeth I9, there is no longer any load on the
a shifter element is` adapted to ride. It will be
clutch ring with the result that the. spring 43
noted in Figure 1 v'that the length of the -key 34
disengages the ring and returns it to its abut
is coextensive- with the width of the flange- 29.
ment against the flange 29. There are condi
As the friction clutch construction at each side
tions of operation, however, when?synchroniza
of the flange 29 is identical, one side will be de
tion is not completed and when it is desired to
scribed and the same reference characters will
_positively retract the friction clutch ring.
be applied to corresponding elements at the other
As ibest shown in Figure 2, the circumferential
A friction clutch ring, L-shaped in cross
? side.
face 45 of each clutch ring is provided with a
` section, is mounted at each side of the flange 29
plurality of spaced. teeth 5| comparatively short _
with the radial wall portion 42 abutting a ra
in an axial direction. The teeth are provided at
_ dial face of the flange 29. Conical springs 43
one end with tapered portions to form a pointed
abut the wall portion 42 to maintain itin con
end 52. Figure? lllustrat s the position of the
tact with the flange 29 until force is applied to
teeth 5I between the teet 32 on the shifting
� torque the spring. At one side, the spring 43
member 3| whenthe friction clutch ring is in
neutral or synchronized position. When in this
position, the shifting member may be movedv axi
tainer ring 44 mountedlin a groove formed on
the enlarged end portion 24 of the shaft l5. Each 35 ally with respect tothe teeth 5I, said teeth slid
abuts the washer 26, previously described. At
the other side, the spring 43 abuts a split re
ing between two of the teeth 32. When synchro
of the friction rings includes a circumferential
nization vis being~ effected with overrunning of
wall 45 which is provided with a conical friction
the friction clutch ring, the teeth 5I are in the
- _face 46 adapted to engage the corresponding face
position shown in Figure 8 with respect to the
of its mating friction clutch element. The clutch
rings are so constructed that normally there is a 40 teeth 32.I To provide for this relative movement,
the teeth 32 are cut away with slots 53 of a par
slight space -between the mating clutch faces.
ticular construction. The back side? of the slots
As best shown in Figure 3, the radial face of
53 are cut at right angles across the teeth 32 cor
each clutch ring is provided with a series of
responding to the rear portion of the teeth 5|.
equally spaced projections 41 having similarly
formed cam faces 48 at each side thereof. The 45 The front portions of the recesses 53 are cut off
on angles 54 corresponding to the angles of the _
projections 41 extend into recesses 49 formed
around'the periphery of the flange 29.
Said re- '
cesses are> formed with angled end walls 58 cor-_
tapered pointed portion 52 of the teeth 5|. When
there is an overrunning condition ofthe friction
clutch ring, there is both axial and circumferen
of the projections 41. `As shown in Figure 3, the 50 tial movement of the projections 41 on the clutch
ring whereby the teeth 5I are moved into a posi
cams 50 are spaced circumferentially farther
tion as shown in Figure 8. In that position the
apart ,than the cams 48 to permit a -certain
friction ring may be retracted by returning the
amount of movement of the clutch ring 41 rel
shifting member to its neutral position. Refer
ative to the flange 29 without initiating axial
65 ring to Figures 7 and 8, an upward movement of
movement of the ring relative to the flange.
the teeth 32 represents shifting of the clutch
It will be understood that when pressure is ap
member from 'an engaging position to a neutral
plied. for example, in a left-hand direction to
position. The. square end portions of the teeth '_
the shifting member 3l, the keys 34 abut the
32 engage'the square end portions of the teeth
radial face portion 42 of the clutch ring, thereby
urging the conical friction member 46 into en 60 5I whereby?positive pressure may be applied to
withdraw the friction clutch ring and to disen
gagement with the conical friction member 20.
gage it from its mating face. This operation is
As soon as the engagement is brought about.
particularly important in some conditions where
there is a rotative force applied to the clutch ring
synchronization has not 籦een completed and �
due to the rotation of the shaft I2 relative to the
where the shaft I2 reaches a stationary condition,
shaft I5. This relative movement applies force
for example, as when the vehicle is at rest. In
to the clutch ring whereby one of the cam faces
such a condition, once the friction ring was en
48 is brought into engagement with one of the
gaged it would be impossible to complete the shift
cam faces 58. _ Due to the angularity of these cam
or to disengage the friction faces without some
faces, axial force is exerted against the clutch
- ring acting to apply greater pressure against the 70 positive means as provided by the teeth 5I.
The operation of applicants? improved synchro
conical friction faces. There is, therefore, a self-v
nizing device has been explained in connection
energizing or pressure build-up reaction which
with the description of _the individual elements
exerts an amplified Aforce on the conical clutch
faces. The amount of amplification depends
It is to 籦e understood that applicants claim as
upon the angle of the cam faces 43 and 50. A
? respondingv in >angularitv to the cam portions 48
thereof.
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2,410,511
prising a rotatable member having a conical fric
tion face formed thereon and a positivo clutch
element with teeth formed thereon adjacent the
What is claimed is:
. `
friction face. a shaft concentric with respect to
1. A synchronizing clutch construction com
said member, said shaft having an abutment
prising a rotatable member having a conical fric
flange thereon, a friction clutch member abutting
tion face formed thereon and a positive clutch
said flange and having a conical face adjacent
element with teeth formed thereon adjacent the
friction face, a shaft concentric with respect to ' the conical face on the rotatable member, resil
said member, said shaft having >an abutmenty 4ient means for urging said clutch member against
said flange, a shifter member mounted on said
flange thereon, a friction clutch member abutting
flange for rotation with the shaft and for sliding
said flange and having a conical face adjacent
their invention all modifications falling within
the scope of the appended claims.
the conical face on the rotatable member, re
silient means for urging said clutch member
movement axially thereof, saidI member having
internal teeth engageable with the teeth on the
rotatable member, said flange having cam struc
ture thereon and said clutch member having
on said flange for rotation with the shaft and for
structure including cammed projections effective
sliding movement axially thereof, said member
to cooperate with the cam structure to move the
having internalteeth engageable with the teeth
clutch member axially upon relative movement
on the rotatable member, said flange having cam
circumferentially with respect to the flange, said
structure thereon and said clutch member hav
_ing structure including cammed projections effec 20 flange also having recesses extending thereacross
in an axial direction, and clutch'applying ele
tive to cooperate with the cam structure to move
ments slidably mounted for reciprocation in saidl
the clutch member- _axially -upon relative move
ment circumferentially with respect to the flange,
recesses, resilient latch means between said ele
against said flange, a shifter member mounted
means for shifting the clutch member and bring
ing the conical faces into initial engagement, said
ments and the shifter member, whereby move
ment of the shifter member carries said clutch
cammed projections in cooperation with said
applying elements therewith, thereby shifting the
clutch member and bringing the conical faces
cammed structure acting to energize the clutch
into engagement, said cammed projections in co
member and increase the pressure in an axial
operation with~ said cammedI structure acting to
direction against the conical clutch faces due to
said energization, means on the shifter member 30 energize the clutch member and increase the
and on the clutch member positively interengage
pressure in> an axial direction against the conical
able when relative angular movement takes place
clutch faces due to said energization, said clutch
in an energizing direction between the flange and
member having a plurality of teeth short in axial
the clutch member whereby the clutch member
length projecting upwardly between teeth on the
may be withdrawn by the shifter member.
shifter member, said shifter member having its
2. A synchronizing' clutch construction com
teeth cut away adjacent each of the teeth on the
prising a rotatable mem-ber having a conical fric
clutch member to permit the relative angular
tion face formed thereon and a positive clutch
shifting of the two membera during camming ac
element with teeth formed thereon adjacent the
tion of the clutch member with respect to the
friction face, a shaft concentric with respect to 40 shaft dange, said teeth on the clutch member be
said member, said shaft having an abutment `
ing cammed -on their faces adjacent the shaft
馻nge thereon, a friction clutch member abutting
flange and the cut away portions of the teeth on
said flange and having a conical face adjacent
the shifter 'member being correspondingly
the conical face on the rotatable member, re
cammed, whereby when the overrunning force on
silient means for urging said clutch member 45 the'clutch approaches zero due to substantial
against said flange, a shifter member mounted
synchronization, the shifter member may be
on said flange for rotation with the shaft and for
moved away from the actuating elements spring
pressed thereagainst, thereby moving the teeth
sliding movement axially thereof, said member
having internal teeth engageable with the teeth � on the clutch member back into alinement with
on the rotatable member, saidv flange having cam 50 the corresponding space between two teeth on
the shifter member and permitting engagement
structure thereon and said clutch member having
structure including cammed projections effective
of the shifter member with the teeth on the gear.
to cooperate with the c_am structure to move the
4. A synchronizing clutch construction com
prising a gear having a conical friction face
clutch member axially upon relative movement
. circumferentially with respect to the flange, said 55 formed thereon. and. a positive clutch element
flange also having vrecesses extending there
with teeth formed thereon adjacent the friction
across in an axial direction, clutch applying ele
face, a shaft on which said gear is rotatably
mounted, said shaft having an abutment flange
ments slidably mounted _for reciprocation in said
thereon, a friction clutch member abutting said
recesses, resilient latch means between said ele
ments and the shifter member, whereby move 60 flange and having a conical face adjacent the
ment of the shifter member carries said clutch
conical face on the gear, resilient means for urg
ing said clutch member against said fiange, a
applying elements therewith, thereby shifting the
shifter member splined on said flange for rotation Y
clutch member and bringing the conical faces
into engagement, said cammed projections in co
with the shaft and'for sliding movement axially
operation with said cammed structure acting to
thereof, said member having internal teeth en
energize the clutch member and increase the pres
gageable with the teeth on the gear, said flange
sure in an axial direction against the conical
havingy cammed recesses formed therein extend
ing axially inwardly from the abutment f ace, and
clutch faces due to said energization, and means
said clutch member having cammed projections
on the shifter member and on the clutch member
positively interengageable when relative angular 70 engageable with said cammed recesses effective
to move the clutch member axially upon relative
movement takes place in an energizing direction
movement circumferentially with respect to the
?between the flange and the clutch member where
flange, said flange also having recesses extending
:by the clutch member may -be withdrawn by the
across the >peripheral faces thereof in an axial
shifter member.
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3. A synchronizing clutch construction com 75 direction, means for shifting the .clutch member -
2,410,511
7
and bringing the conical faces into initial en- ,
gagement, said cammed projections in coopera
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8
tial width projecting between said friction clutch
faces, a friction clutch member abutting each
-tion with said cammed recesses acting to en
side of thev馻nge and having a conical friction
ergize the clutch member and increase the pres
face adjacent the conical face on the correspond
sure in an axial direction against the conical 5 ing rotatable member, resilient means for urging
clutch faces due to said energization, means on
said clutch members against said flange, a shifter
_ the shifter member and on the clutch member
positively interengageable when relativel angular
member mounted on said flange for rotation with
the shaft and for sliding movement in either di
movement takes place in an energizing direction
rection axially thereof, said member having in
between the flange and the clutch member l0 ternal teeth engageable with the teeth on the ro- _
whereby the clutch member may be withdrawn
tatable members, said flange and said clutch
by the shifter member.
members having a cammed structure therebe
5. A synchronizing clutch construction com
tween effective 'to move theclutch members ax
prising a gear having a conical friction face
ially upon relative angular movement with re
formed thereon and a positive clutch element l5 spect to the flange, clutch applying elements car
with teeth formed thereon adjacent the friction
ried by said flange and slidably mounted for re
face, a shaft on which said gear is rotatably
ciprocation axially thereacross, resilient latch
mounted, said shaft having a flange thereon, a
means between _said element and the shifter
friction clutch member abutting said flange and
member whereby' movement of the shifter mem
having a conical face _adjacent the conical face 20 ber in either direction carries said clutch actuat
on the gear, resilient means for urging said clutch
ing elements therewith thereby shifting the cor
member against said 馻nge, a shifter member
responding clutch member into engagement, and
splined on said flange for rotation with the shaft
means on the shifter member and on the clutch
members interengageable when the relative an
and for sliding movement axially thereof,l said
memberhaving internal teeth engageable with 25 gular movement takes place whereby the clutch
member may be positively withdrawn by retract
the teeth on the gear, said flange having cammed
recesses formed therein extending axially in
wardly from the abutment face, and said clutch
ing movement of the shifter member.
'l'. A synchronizing clutch construction com
member having cammed projections engageable
prising rotatable members having spaced conical
with said cammed recesses effective to move the 30 friction faces formed thereon and'toothed posi
clutch member axially upon relative movement
circumferentially with respect to the flange, said
flange also having recesses extending across the
peripheral faces thereof in an axial direction, and
-tive clutch elements formed adjacent the friction
faces, a shaft concentric with respect to said
members, said shaft having an abutment flange
of substantial width projecting between said fric
clutch applying. elements slidably mounted for .
tion clutch faces, a friction clutch member abut- -
reciprocation in said recesses, said elements be
ing also slidable radially in said recesses and be
ing spring pressed in an outward radial direction,
ting each side of the 馻nge and having a conical
friction face adjacent the conical face on the cor
said elements having projections on their outside
responding rotatable member, resilient means for
urging said clutch members against said flange. a
faces, and said shifter member having?recesses
vengageable by said projections, whereby move
shifter member mounted on said flange for rota
tion with the shaft and for sliding movement in
~ ment of the shifter member carries said clutch
actuating element therewith, thereby shifting the
clutch member and bringing the conical `faces
into engagement, said cammed projections in
either direction axially thereof, said member hav
ing internal teeth engageable with the teeth on
, the rotatable members, said flange and said clutch
~ members having a cammed structure therebe
cooperation with said cammed recesses acting to
tween effective to move the clutch members ax
ially ?upon relative movement circumferentially
energize >the clutch member and increase the
with respect to the flange, said flange also hav
pressure in an axial direction against the conical
ing recesses extending thereacross in an axial di
clutch faces due to said energization, said clutch
member having a plurality of teeth short in axial 60 rection, clutch applying elements slidably mount
length projecting upwardly between teeth on the
ed for reciprocation in said recesses, resilient latch
means between said element and the shifter
shifter member, said shifter member having its
member,'whereby movement of the shifter mem
teeth cut away adjacent each of the teeth on the
ber in either direction carries said clutch actu
clutch member to permit the relative angular
shifting of the two members during camming 55 ating elements therewith, thereby shifting the '
action of the clutch member with respect to the
corresponding clutch member with the conical
shaft flange, said teeth on the clutch member
faces being brought into engagement, said cam
being cammed on their faces adjacent the shaft
med structure acting to energize a clutch mem
flange and the cutaway portions of the teeth
ber and increase the pressure in an axial direc
on the shifter member being correspondingly 30 tion >against the conical clutch faces due to said
cammed, whereby when the overrunning force on
energization, said clutch members having a plu
the clutch approaches zero due to substantial
rality of teeth short in axial length projecting up
synchronization, the shifter member may be
wardly beneath teeth on the shifter member, said
moved away from the actuating elements spring
shifter member having its teeth cut away adja
pressed thereagainst, thereby moving the teeth 65 cent each side of the teeth' on the clutch member
to permit the relative angular shifting of the two
members during camming action of the clutch
the shifter member and permitting engagement
member with respect to the shaft flange, said
teeth 'on the clutch member being cammed on
of the shifter` member with the teeth on the gear.
6. A synchronizing clutch construction com 70 their faces adjacent the shaft flange and the cut
away portions of the teeth on the shifter mem
prising rotatable members having spaced coni
ber? being correspondingly cammed, whereby
cal friction faces formed thereon and toothed
when the overrunning force on the clutch� ap
positive clutch elements formed adjacent the fric
on the clutch member back into alinement with
the corresponding space between two teeth on
tion faces, a shaft concentric with respect to said
members, said shaft having a 馻nge of substan
. preaches z'ero due to substantial synchronization
7s the shifter member may be moved away from the
2,410,511
- side of the flange and having a conical friction
actuating elements spring pressed thereagainst,
thereby moving the teeth on the clutch member
back into alinement with the corresponding spa'ce
- y face adjacent the conical face on the correspond
between two teeth on the shifter member and
permitting engagement of the shifter member
with the teeth on the corresponding gear.
8. A synchronizing clutch construction com
prising gears having spaced conical friction faces
formed thereon and toothed positive clutch ele
ments formed adjacent the friction faces, a shaft
with respect to which said'gears are rotatably
mounted, said shaft having a flange of substantial
ing rotatable member, resilient means for urging
said clutch members against said flange, a shifter
member mounted on said flange for rotation with
the shaft and for sliding movement in either
direction axially thereof, said member having
internal teeth engageabie with the teeth on the
rotatable members, said flange and said clutch
members having a cammed structure therebe
tween ei頴ctive to move the clutch members
axially upon relative movement circumferentially
' width projecting between said friction clutch .
with respect to the flange, said flange also having
faces, a friction clutch member abutting each side ,
recesses extending thereacross in an axial direc
of the flange and having a conical friction face
adjacent the conical face on the corresponding
gear, resilient means for urging said clutch mem
bers against said flange, a shifter member splined ?
on said flange for rotation with the shaft and for sliding movement in either direction axially 20
thereof, said member having internal teeth en
gageabie with the teeth on the gears, said flange
having cammed recesses formed therein extend
tion, clutch applying elements slidably mounted
for reciprocation in said recesses, resilient latch
means between said elements and the shifter
member, whereby movement of the shifter mem
ber in either direction carries said clutch ac
tuating elements therewith, thereby shifting the
corresponding clutch member withV the conical
faces being brought into engagement, said
cammed'structure acting to energize a clutch
member and increase the pressure in an axial di
ing axially inwardly from the abutmentA faces,
and said clutch members having cammed projec 25 rection against the conical clutch faces due to
said energization, said ,clutch members having a
tions engageable with said cammed recesses effec
plurality of teeth short in axial length projecting
tive to move the clutch members axially upon rel
upwardly beneath teeth on the shifter member,
ative movement circumferentially with respect to
said shifter member having its teeth cut away ad
the flange, said flange also having recesses ex
tending across the peripheral faces thereof in an 30 'jacent each side of the teeth on the clutch mem
axial direction, clutch applying elements slidably
mounted for reciprocation in lsaid recesses, said
bei` to permit the relative angular shifting of
the two members during camming action of the
elements being also slidable radially in said're- '
cesses and being spring pressed in an outward ra
clutch member with respect to the shaft flange, _
jections on their outside faces, and said shifter
member having recesses engageable by said pro
jections, whereby movement of the shifter mem
ber in either direction carries said clutch actuat
the cut away portions of the adjacent teeth on
the shifter member being also ~square to provide
abutment means whereby the clutch member may
be positively withdrawn from engagement when
and said teeth on 籺he clutch member being
dial direction, said elements having spherical pro 35 square on their ends opposite the shaft 馻nge,
ing elements therewith, thereby shifting the cor
responding clutch member with the conical faces
being brought into engagement, said cammed '
vin energizing position by retracting movement of
the shifter member.
10. A synchronizing clutch construction com
prising~ rotatable members having spaced conical
projections in cooperation with said cammed re
friction faces formed thereon and toothed Dosi
cesses acting to energize a clutch member and in
crease the pressure in an axial direction against 45 tive clutch elements formed adjacent the friction
faces, a shaft concentric with respect to said
-the conical clutch faces due _to said energization,
members, said shaft having a flange of substan
said clutch members having a plurality of teeth
tial width projecting between said friction clutch
faces, a friction clutch member abutting each
tween teeth on 'the shifter member, said Sluiter
member having its teeth cut away adjacent each 50 side of the flange and having a conical friction
face adjacent the conical face on the correspond-'
side of the teeth on the clutch member to permit
short in axial length projecting upwardly be
the relative angular shifting of the two members -
? ing rotatable member, resilient means for urging
said clutch members against said fiange, a
during camming action of the clutch member
shifter member mounted on said flange for rota
with respect to the shaft flange, said teeth on the
clutch member being cammed Von their faces ad 55 tion with the shaft and for sliding movement
in either direction axially thereof, said member
jacent the shaft 馻nge and the cut away portions ?
having internal teeth engageable with the teeth
ofthe teeth on the shifter member_ being corre
on the rotatable-members, said flange and said
spondingly cammed, whereby when the overrun
clutch members having a cammed structure
ning force on the clutch approaches zero due to
substantial synchronization the shifter member 60 therebetween effective to move the clutch mem
bersI axially upon relative movement circum
may be, moved away from -the actuating elements
spring pressed thereagainst, thereby moving the
ferentially with respect to the flange,- said 馻nge
teeth on the clutch member back into alinement
with the corresponding space between two teeth
on the shifter member and permitting engage
ment of the shifter member with the teeth on the
also having recesses extending thereacross in an
corresponding gear.
-
'
9.> A synchronizing clutch construction com
prising rotatable members having spaced conical
friction faces formed thereon and toothed posi
tive clutch elements formed adjacent 'the fric
tion faces, a shaft concentric with respect to said
members, said shaft having a flange of substan
axial direction, clutch applying 籩lements slid
ably mounted for reciprocation in said recesses,
resilient latch means between said elements and
the shifter member, whereby movement of the
shifter member in either direction carries said
clutch actuating elements therewith, thereby .
shifting the corresponding clutch _member with
the conical faces being brought into engagement
said cammed structure acting to energize a clutch
member' and increase the pressure in an axial
directionagainst the conical'clutch faces due to
tial width projecting between said friction clutch
faces, a friction clutch member abutting each> ?16 Said, energization, said clutch members having
2,410,611v
Il.
12
a plurality of teeth short in axial length pro
jecting upwardly beneath teeth on the shifter
internal teeth, said flange and said clutch mem
. ber having a cammed structure therebetween ef
member, said shifter member having its teeth
fective to move the clutch members axially upon
cut away adjacent each side of the teeth on the
relative movement circumferentially with respect
clutch member to permit the relative angular
to 籺he flange, means for applying force upon
shifting of the two members during camming
movement of the shifter member to said clutch
action of the clutch member with respect to the , member, whereby the conical faces are brought
shaft flange, said teeth on the clutch member
>into engagement, said cammed structure acting
being cammed on their faces adjacent the shaft
to energize a clutch member and increase the
_flange and the cut away portions of the teeth 10 pressure in an'axial direction against the engag
on the shifter member being correspondingly
ing conical clutch faces due to said energization,
cammed, whereby when the overrunning force
said clutch members having avplurality of teethshort in axial length projecting upwardly be
? synchronization the shifter member may be
tween teeth on the shifter member, said shifter
moved away from the actuating elementsv spring 15 member having its teeth cut away adjacent each
pressed thereagainst, thereby moving the teeth on
of the teeth on the clutch member to permit the
� the clutch member back into alinement with the
relative angular shifting of the- two members dur
corresponding space between two teeth on the
ing camming action of the clutch member with
shifter member and permitting engagement of
respect to the shaft flange, and said teeth on the
on the clutch approaches zero due to substantial
,
the shifter member with the teeth on the cor- 20 clutch member being square on their ends oppo- '
responding gear, and said teeth on the clutch ,
member being square on their ends opposite the
shaft flange, the out away portions of the ad
jacent teeth on the shifter member being also
square to provide abutment means whereby the
clutch member may be positively withdrawn fromv
engagement when in energizing position by r�
tracting movement of the shifter member.
site the shaft flange, the cut away portions of the
adjacent teeth on the shifter member being also
25'
square to provide abutment means whereby the
clutch member may be positively withdrawn from
engagement when in energizing position by re
tracting movement of the shifter member.
13. A synchronizing clutch construction com
prising a shaft having a flange projecting there
11. A synchronizing clutch construction com
from, a friction clutch member abutting said
prising'a shaft having a flange projecting there 30 flange and .having a -conical friction face thereon,
from, a -friction clutch element abutting said
resilient means for urging said clutch member
flange and having a conical friction face thereon, ~
against said flange, a shifter member splined on
resilient means for urging said clutch member
said flange for rotation with the shaft and for
against said flange, a shifter member splined on
sliding movement thereof, said member having
said flange for rotation with the shaft and for 35 internal teeth, said flange and said clutch mem
sliding movement thereof, said member having
ber having a cammed structure therebetween ef
` internal teeth, said flange and said clutch member
fective to move the clutch members axially upon
having a cammed structure therebetween effective
relative movement circumferentially with respect
to move the clutch members axially upon rela
to the flange, means for applying force >upon
tive movement circumferentially with respect to
movement of the shifter member to said clutch
the flange, means for applying force upon move
member, whereby the conical faces are brought
ment of the shifter member to said clutch mem
into engagement, said cammed structure acting
Jber, whereby the conical faces are brought into
to energize a clutch member and increase the
engagement, said cammed structure acting- to en
pressure in anaxial direction against the engag
ergize a clutch member and increase the pressure 4. ing conical clutch faces due to said energization,
in an axial direction against the engaging conical
Asaid clutch members having a plurality of teeth
short in axial length projecting upwardly be
clutch faces due to said energization, said clutch
members having a plurality of teeth short in axial
tween teeth on the shifter member, said shifter
length projecting upwardly between teeth on the
member having its teeth cut away adjacent each
of the teeth on the clutch member to permit the
shifter member. said shifter member having its
teeth cutaway adjacent each of the teeth on the
relative angular shifting of the two members dur
clutch member to permit the relative angular
ing camming action of the clutch member with
shifting ofthe two members during camming ac
respect to the shaft flange, said t鑕th on the
.tion of the clutch member with respect to the
clutch member being cammed on their faces ad
jacent the shaft flange and the cut away portions
shaft flange, said teeth on the clutch member
being cammed on their faces adjacent the shaft
of the teeth on the shifter member being cor
flange and the cut away portions of the -teeth
respondingly cammed, whereby when the over
on the shifter member being correspondingly
running force on the clutch approaches zero, due
cammed, whereby when the overrunning force on
to substantial synchronization the shifter mem
the clutch approaches zero due to substantial syn
ber may be further shifted in an axial direction,I
chronization the shifter member may be moved
thereby moving the teeth on the clutch member
back into -alinement with the corresponding space
away from the actuating elements spring pressed
thereagainst, thereby moving the teeth on the
between two teeth on the shifter member and
permitting further movement of the shifter mem
clutch member backV into alinement with the cor
responding space between two teeth on the shifter
ber, and said teeth on the clutch member being
square on -their ends opposite the shaft flange,
member and permitting further movement of the
shifter member.
,
the cut away portions of the adjacent teeth on
12. A synchronizing clutch construction com
vthe shifter member being also square to provide .
prising a, shaft having a flange projecting there
abutment means whereby the clutch member may
be positively withdrawn from engagement when
from, >a friction clutch member abutting said
in energizing position by retracting movement of
flange and having a conical ?friction face thereon,
resilient means for urging said clutch member
the shifter member.
against said flange, a shifter member splined on
JOHN H. LETSINGER.
said flange for rotation with the'shaft and for
HAROLD F. FOLEY.
sliding movement thereof, said member having
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