Jan; 7, 1941. R, A, CARLSON . 2,413,810 ' FRICTION CLUTCH Orìgingl Filed Feb. 14, 1941 ' JIJ\ .9 2 Sheets-Shoot 1_ fz.' .2 £347 y as J7 J. . j jf 2'5"' 7l ¿Ü m4’ A? da j" .um „Jaaa ¿e , J2 ~ d, 27 ,eg JJ ff’f Jl J Jan. 7, 1947. ' R. A, CARLSON 2,413,810 FRICTION CLUTQH Original Filed Feb. 14, 1941 l ì 2 Sheets-Skeet 2 fnvenzárf _F 727.0720.’f Q' _af-‘Zaan -FÈZM/f l l ~ /JQ @á l2,413,810 Patented Jan. 7, 1947 UNITED sTATas PATENT oFFics " FBICTION CLUTCH `Raymond A. Carlson, Rockford, lll., asslgnor to Borg-Warner Corporation, Chicago, Ill., a cor poration of Illinois ~. Original application February 14, 1941, Serial No. . 378,848. Divided and this application October 9,1943, serial No. 505,604> 6 Claims. 1 2 This invention relates to friction clutches and particularly to an improved arrangement of driv-- ing and engaging means for the friction facing assembly. (cl. 19a-6s) ` « _ ' .This is a division of my United States applica tion, Serial No. 378,848. ñled February 14, 1941, which issued as Patent No. 2,334,382. It is an object of the invention to provide, in , rial. >Interposed between the segments I4 are a plurality of 4loose segments I1 of substantially the same thickness as the segments I4 so as to cooperate with the segments I4 in maintaining the facings I6 in parallel planes while taking the _ pressure of clutch engagement. The segments I1 are confined between the facings I6, the seg ments I4, and the drive ring IÍI. The segments I4 and I1 are provided with _ a friction clutch _of the typevwherein the facing carrying means is in the form of an annulus 10 peripheral teeth 9 and 9a respectively meshing with the internal teeth I2roi the drive ring I0. having driving connection with an encircling The teeth on the loose segments I 1 are adapted drive transmitting member and having peripheral to snugly engage the teeth I2 under the effect teeth meshing with internal teeth on _said drive of centrifugal force, so as to take up the back transmitting member, means- for minimizing lash between the facings and the drive ring I0, backlash between saidteeth.,- To this end, the as will later be pointed out. » invention contemplates the formation of the fac The facings I6 are adapted to be engaged be ing supporting annulus in the form of a plurality tween a pair of driven elements I9 and 20, the of circumferentially separated segments to which element I9 having a hub portion 2| which is. the facings are secured, and the provision of ad ditional segments which are loosely received in 20 splined upon a driven shaft 22 and the element the spaces defined between said facings and the 20 having internal teeth 23 meshing with splines ends of the other segments and are provided with 24 on the hu-b' portion 2l so as to be drivingly connected thereto while capable of axial shifting peripheral teeth adapted to snugly engage the movement to permit clutch engagement. teeth of the drive transmitting member under the effect of centrifugal force.. Thus the loose 25 Mounted on the shaft 22 for axial shifting additional segments, when gripped between the movement is a sleeve 25 which is connected friction facings prevent independent movement through the medium of an end thrust bearing 26 of the facing supporting segments which would create backlash between said latter segments and with a collar 21 having trunnions 28 adapted to coact with a shifting fork of conventional design. 30 Secured upon thesleeve 25 is an operating cam the drive transmitting member. ring 29 having a frusto-conical cam surface 30 Other objects, the advantages and uses of the terminating in a reentrant locking groove 3i. invention will become more apparent after read Linkage for transmitting clutch operating ing the following specification and claims, and after consideration of the drawings forming a movement from the cam 29 to the driven clutch part of the specification, wherein: ing elements I9 and 20, includes a pluralityof Fig. l is an axialv sectional view of a clutch embodying my invention, the clutch being shown levers 32 each fulcrumed on a pivot pin 33 mount ed between a pair of ears 340i a fulcrum mem ber 35 which is flxedly associated with the driven element I9 and‘shaft 22 as for example, by means 40 of thel machine screws 1 securing it to the driven clutch disengaged; and’ ' element I9. The levers 32 are in the form of bell Fig. 3 is a transverse sectional view of the cranks, each including an arm 36 extending in clutch, taken on the line 3--3 of Fig. 1. a generally axial direction and an ann 31 ex As an example oi’ one form in which the in» vention may be embodied, I have shown in the r tending radially inwardly. The arm 3S is formed A at its end with a fork 38 in which is journalleda - drawings a clutch of the heavy duty industrial roller 39 adapted to coact with thecam face 30. type, including a drive transmitting member Il) The transmitting linkage further includes , having openings II by means of which it may be manual adjustment mean-s, indicated generally at attached to a driving member such as for ex 8, and resilient transmission links, indicated gen ` ample, a ñywheel, and having internal teeth I2 erally at I8, both interposed in series with each for transmitting drive to a driving clutch element other between the levers 32 and the driven ele indicated generally at I3. The driving element I3 includes a plurality of circumferentially sepa- ~ ment 20. The adjustment means 8 comprises an adjust rated facing supporting segments I4l to which ing cam ring 44 rand a plurality of levers 40, the are secured »as by means of rivets I5, a pair of embracing facings I6 of suitable frictional mate 55 ring 44 being carried by the driven element 28 in engaged relation; _ Fig. 2 is an axial sectional view showing 'the 2,413,810 and the levers 40 being operatively interposed between the ring 44 and the resilient link I8. The levers 40 are embraced between the ears 34 of the fulcrum member and are fulcrumed on pivot pins 4I mounted inthe ears 34 outwardly of the levers 32. The inner arms of the leversv 4 load. When the clutch begins to rotate, the loose additional segments I1 are centrifugally moved outward so that their teeth 9a fit snugly into internal teeth I2 on the drive transmitting ring I0. When pressure members I9 and 20 have moved into frictional engagement with the fac ings I6 as above described, the >clutch is fully 40 are bifurcated to provide spaced furcations 53 -coupled and the fixed as well as the loose seg which embrace the levers 32. The outer arms 42 ments I4 and I1 are firmly held between the fac of the levers 40 are engaged against cam surfaces 43 on the adjusting ring 44. The ring 44 has a 10 ings. Due to the snug flt of teeth 9a with ring teeth I2 there can be no relative rotative move flange 45 which is secured against the rear face ' ment between' any of the clamped parts, includ of the driven element 20 by means of screws 48. ing the ring teeth I2 and the fixed segment teeth The screws 48 extend through openings 41 in the 9, and consequently backlash between these latter flange 45 and may be removed to permit the ring ' 44 to be rotated with reference to the driven 15 meshed teeth is impossible. The cam surface 30 of the operating member element 2li and reinserted through different provides for considerably more movement of the openings 41.' levers 32 than is necessary for advancing the The resilient links I8 are mounted in axially extending cylindrical bores 48 in the hub portion4 ~ driven elements into engagement with the drive 2| of the driven element I9. Each link I8 in 20 element. The surplus movement is'absorbed in cludes a coil spring 49, a draw bolt 50 and a the compression of the spring 49. This surplus movement is utilized to take up slack -in the link age that would otherwise be occasioned by wear the washer 5I and a head 52 on one end of the ing down of the facings. Thus the yielding trans- . draw» bolt 50. The head 52 and washer 5I are fitted loosely in the bore 48 so as to be axially 25 mission links vI8 provide for automatic adjust ment for facing wear within a limited range.“ slidable therein. _ s ' When this range of adjustment has been> ex The resilient links are each operatively inter hausted, it may be extended by manually ,adjust posed between an arm 31 of a lever 32 and the ing the cam ring 44. Within the new range of furcations 53 of the corresponding lever 40. y The arm 31 has at its end a fork embracing the‘ bolt 30 adjustment thus provided, the linkageI will con tinue to provide automatic adjustment for fur 50, received in notches 54 formed in the‘sides of ther facing wear. ' ' the bolt, and acting against a head 55 deñning The invention provides an arrangement which one extremity of thel respective notches 54. The is very `compact. 'I'he resilient transmission ele furcations 53 of the lever 40 are engaged against washer 5I, the -spring 49 being engagedbetween arcuate end surfaces 56 of a pair of wings 51 35 ments are-accommodated within the hub of the driven element I9. The levers 32 are partially , ' nested in the levers 40. , , “ Rotation of the adjustment ring 44 with refer formed on the washer 5I. It will be apparent that other available forms and arrangements for engaging and disengaging the clutch may be provided in combination with their pivots 4I, the furcations 53 moving to the my novel‘clutch plate and driving assembly to left and compressing the springs 49. which the present case is primarily directed. The cam ring 44 forms a support for a clutch I While I have described my invention in con cover B0 which has a ring 6I snugly fitted on the _nection with its specific embodiment thereof, it periphery of the cam ring 44 and tapers rear wardly and inwardly to an opening 32 which re 45 i-s to be understood that this is by way of Villus ence to the driven element 20 causes the levers 49 to be adjusted in a clockwise direction around ceives the operating member 2|. ' ` In the operation of the clutch, assuming it to be in disengaged position as shown in Fig. 2, the , rotation of torque transmitting ring IIi by the power source as contemplated will result in the 50 tration and not by way of limitation and the Scope of my invention is~ defined solely by the appended claims which should be construed as broadly as the prior art will permit. >I claim: ' free arcuate segments I1 being moved radially outwardly bringing the teeth 9a thereof into close .engagement with the opposed teeth I2 of the 1. In a friction clutch, an annular torque Itransmitting member having internal teeth, a ment through the coil springs 49 and the washers - said loosely confined -segments being adapted to be clamped between said facings during driving plurality of circumferentially spaced facing car torque ring I0. The movement of operating cam ' rying segments having external teeth-- meshing 29 to the left in Fig. 2 will cause the rollers 39 55> with said internal teeth, a pair of facings secured to the respective sides of said segments, and aÍ to ride radially outwardly against the cam face plurality of segments, loosely confined between 30, in turn causing the levers 32 to pivot in a said fa-cings and the ends of said supporting seg vcounterclockwise direction about their fulcrum ments and having peripheral teeth meshing with pivots 33. The arms 31 of the levers 32 will swing said internal teeth and adapted to snugly engage tothe right as viewed in the drawings, drawing the same under the effect of centrifugal force, the bolts 50 to the right, and transferring move 5I, to the adjustment levers 40, causing the latter to swing in a counterclockwise direction. The operation ofthe clutch to minimize blacklash outer‘arms 42 of the levers 40, bearing against 65 between said annular member and said facing the cam ring 44, transmit the movement to the drivenelement 20, advancing the latter to effect l clutch engagement. The reaction is transmitted carrying segments. 2. In a friction clutch, an annular torque transmitting member having internal teeth, a plurality of circumferentially spaced facing car from the levers 32 to the pivots 33, thence to the fulcrum member 35 and the driven element I9. 70 rying segments having driving connection with said torque-transmittingmember, a pair of fac Thus the two driven elements are drawn together ings secured to the respective sides of said seg into clutching engagement with the drive ele ments, and a plurality ofsegments, loosely con ment I3. As engagement is attained, the spring ñned between said facings and the ends of said 49 will yield, and thus the engaging pressure is fixed at `a maximum. determined by the spring 75 supporting segments and having peripheral teeth 2,413,810 engaging said friction facings therebetween sub sequent to the initial rotation of said torque ring whereby said second named plurality of arcuate plates are held between said annular facings in positions wherein the teeth thereof cooperate with the teeth of said torque ring to prevent backlash between said ring and said first seg meshing with said internal teeth and adapted to snugly engage the same under the effect of cen trifugal force. said loosely confined segments being adapted to be clamped between said facings during driving operation of the clutch to mini mize backlash between said annular member and said -facing carrying segments. 3. In a friction clutch arrangement, means mental plates. A 5. In a friction clutch, an annular torque defining an annular torque transmitting ringv having radially inwardly extending teeth on the inner periphery thereof, a first plurality of sepa transmitting member; a plurality of circumfer entially spaced facing carrying members havirg . driving connection with said torque-transmitting member; a pair of facings secured to the respec- „ having radially outwardly lextending teeth on the' tive sides of said circumferentialïy spaced mem outer periphery thereof meshing with said inner bers; and a ‘plurality of centrifugally influenced peripheral teeth of said torque ring, a pair of members loosely confined between said facings annular friction facings secured to the opposite and the ends of said carrying members and nor sides of each'of said first plurality of plates and mally rotatable with said torque-transmitting a second plurality of circumferentialiy spaced member, and means for effecting a snug engage segmental plates interposed between the ends of successive ones of said first named plates, said 20 ment of said centrifugally influenced members with said torque-transmitting member under the second plurality of plates having radially out influence of centrifugal force for effecting a driv wardly extending teeth and being freely movable ing connection between said loose members and radially outwardly between said facings under rate circumferentially spaced segmental plates the influence of vcentrifugal force to effect close engagement of said teeth of said second plurality of plates with the inner peripheral teeth of said torque transmitting ring upon said ring and Aplates being rotated prior to clutch engagement, whereby backlash between said ring and said first plurality of segmental plates is prevented during clutch engagement. 4. In a friction clutch arrangement, means defining an annular torque transmitting ring having radially inwardly extending teeth on the inner periphery thereof, a first plurality of sepa rate circumferentially spaced segmental plates 25 said torque-transmitting member, said loosely confined members being adapted to be clamped between said facings during driving operation of the clutchwhereby to minimize backlash between said torque-,transmitting member and said facing ' carrying members. 6. In a friction clutch, an annular torque transmitting member having internal teeth; a plurality of clrcumferentially spaced facing sup _ porting members having external teeth meshing with said internal teeth to establish a driving connection with Ísaid torque-transmitting mem ber; friction facings secured to opposite sides of lsaid supporting members; a plurality of centrifu having radially outwardly extending teeth on the gally influenced members loosely confined bef` outer periphery thereof meshing with said inner tween said facings in the spaces between said peripheral teeth of said torque ring, a pair of annular friction-facings secured to the opposite 40 supporting members; peripheral teeth on said centrifugally influenced members normally loose ly meshed with said internal teeth and adapted to be snugly engaged therewith under infiuence segmental plates interposed between the ends of of centrifugal force; and clamping members be successive ones of said first named plates, said second plurality lof plates having radially out.. 45 tween Which said supporting members, friction facings, and centrifugally influenced members wardly extending- teeth and being freely movable are adapted to be clamped during driving opera radially outwardly between said facings under the tion of the clutch, whereby the clamped centrifu infiuence of centrifugal force to >eñect close en gally influenced members are eñective to mini gagement of said teeth of said second plurality mize backlash between said torque-transmitting of plates with the inner peripheral teeth of said member and said facing supporting members. torque transmitting ring, means including a pres sides of each of said first plurality of plates and ' a second plurality of circumferentially spaced sure plate and means for operating the same for ` , ' RAYMOND A. CARLSON.