Патент USA US2412436код для вставки
Dec.' .10, 1946. H, „_ VANDERZEE ' 2,412,436 FLUID OPERATED 'CLUTCH Filed March 22, 1944 2 Sheets-Sheet 1 SW., à@ NN Dec. 1.0, 1946. H. H. vANDr-:RZEE 2,412,436 FLUID OPERATED CLUTCH Fíledjlarc‘n 22, 1944 2 Sheets-Sheet 2 2,412,436 Patented Dec. 10, 1946 UNITED STATES -PATENT OFFICE FLUID OPERATED CLUTCH Harry H. Vanderzee, Racine, Wis., assignor to Twin Disc Clutch Company, Racine, Wis., a corporation of Wisconsin. ApplicationMai-ch 22, 1944, Serial No. 527,620 6 Claims. (Cl. 192-85) 1 2 . eiiectuated will be definitely pointed out in the My invention relates' to clutches and more par- , ticularly to those of the fluid actuated type in which any selected fluid under pressure, either claims. ‘ ‘ = In the drawings: ' - Fig. 1 is a longitudinal section of my improved gas or liquid, is applied to a piston which constitutes the actuating element of the clutch. Clutches of this general type wherein an an clutch in disengaged position >taken alongthe nular piston applies the engaging pressure are line I-l in Fig. 2. Fig. 2 is an end view of the clutch looking vin well known and, for certain installations, they the direction of the arrow 2 in Fig. 1. possess a, number o'f advantages overthe more commonclutch arrangement in which the en gaging pressure is applied at spaced locations around the clutch through mechanisms includ y Fig. 3 is an enlarged, fragmentary, sectional 10 view of the clutch as shown in Fig. l, but in engaged position. Fig. 4 is an enlarged elevation of the head end of the spring bolt as Viewed in Fig. 1. ' ing links and levers. Some of these advantages v are a uniform and continuous application of the Fig. 5 is anenlarged, fragmentary view of the engaging pressure around the clutch, quick ac 15 clutch engaging face of the pressure plate show tion in engagement and disengagement which is ing the relation of the head end of the spring particularly important when the associated ma» chine is designed for repetitive, short Working bolt thereto. . ' Referring to thel drawings, the numeral l0 designates a shaft which for purpose of descrip . cycles, and capacity for rapid acceleration and deceleration and quick reversals. 20 tion will be regarded as 'the driven member and which is secured by a key il to a hub l2 having When employed under the foregoing conditions,v at one end a flange i3 which acts as the back or the eiiicient control and dissipation of the gen abutment plate of the clutch. l erated heat presents a serious problem because it The hub is pe ripherally splined or toothed at lli for axially~ is important that the fluid cylinder assembly, including the release springs, be kept relatively 25 slidable and rotarily driven engagement with in ternally toothed plates l5 that are alternately cool. e One object of my invention is to provide a ñuid operated clutch in which important manufactur ing and operating advantages, relative toprioi" i related to friction plates I6 which are externally toothed for engagement with` a driving member - (not shown), such as ab' iiywheel or other part. clutches of this type, are achieved -by the manner 30 The direction oi drive through the clutch may be reversed without affecting its operability. _ of forming the air cylinder and of .relating the A ring Il abuts the end of the hub l2 remote ' piston A further and clutch objectpressure is the provision plate thereto. in the -"Ifore from the iiange i3 and is secured thereto by going type of clutch of -means, other than the piston, for piloting the piston during its move ments in order to lessen ,wear on the piston pack ing’. ` l A further object is to devise a clutch of the means of a plurality of cap screws i8. 35 This ring is provided with a peripheral and continuous, annular wall I9 that extends toward the clutch plates I5 and I6 and- forms with the adjacent end o1’ the hub I2 an annular cylinder 20. Slid ' character indicated wherein the member which ' ably mounted in the cylinder is a piston assern'n with a hub or generally any rotating member, ried on the extension 23, cap screws 25 serving deiines a portion of they air cylinder also carries 40 bly comprising a piston 2| provided with suitable packing 22 that may -be cup-shaped and an the release springs and transmits the reactive annular extension 23 that projects laterally from thrust of the fluid medium. ' and is preferably integrally formed with a pres A further object is to provide a release spring sure plate 24 which, in the released position of mechanism for a clutch of the type wherein a 45 the clutchshown in Fig. 1, abuts vthe inner end pressure plate has toothed driving engagement of the wall i9. The piston 2l abuts and is car the mechanism being arranged to accommodate to rigidly secure these parts together, while the relative rotative movements of the plate due to extension pilots the pressure plate 24 and the worn teeth without hampering the effectiveness 50 piston 2| in the cylinder 20, thus enabling >the of the mechanism. l plate and piston to move freely without cocking These and further objects of my invention will and reducing wear of the packing 22. The radial be set forth in the following specification, ref portion of the packing is clamped between the pis-V erence being had to the accompanying drawings, ton 2l and extension 23. ' ` and the novel means by which said objects are 65 The plate .24 is internally toothed forsdriving 2,412,436" ' tive to the ring I1, but the ability of the l‘oolts 36~ engagement _with the teeth I4, thus preventing, to move angularly’relative to the plate maintains by reason ofçthe rigid connection of this plate to the full functional capacity of the release mech the piston assembly, any rotation of the piston anism. Rotationbf each .spring bolt 36 about its 2| relative -to the cylinder. But for this connec axis is prevented by providing a lug 43 (see Fig. 5) tion, _such rotation would occur during engage which is oii‘set from the head 35 that is prefer ment and disengagement of the clutch and would ably cylindrical in-shape and this lug loosely fits result in undue wear of the piston packing 2,2 fa groove 44 form‘ed in the Wall of the associated with consequent leakage or “blow by” of the air. In a clutchwhose working cycle is repeated at It is important to provide some method of short intervals. this wear becomes critical- and 10 cooling the springs 4I for unless the heat con lrequires frequent servicing of the unit. Fur ducted to the springs from the pressure plate 24 ther, where itis necessary 'that the clutch be is dissipated to a considerable extent, the springs quick acting, air leakage must be reduced to the quickly lose their temper and effectiveness. Ac utmost'minimum, otherwise the clutch will be 15 cordingly, portions ‘of the springs are exposed characterized by slow action. f through the ring wall I9 to the cooling action of Air, 4or any desired fluid, is introduced into the socket 34. cylinder 20 through connecting'passages in the ` -« » , ` _the atmosphere by means of continuous grooves shaft I0 andhub I2. Specifically, a rotating air seal (not shown) is applied to either endrof the shaft I0, depending upon the position relation _of thelloadtothe clutch, the right end being vs_e-' lected'in the present' instance. The vshaft IU-ex-v ' tends through the ring I1 andv would be sup ported normally in a Ibearing (not shown) before] receiving the seal which provides a connection 25 between a, source of air under pressure and an 45 in and around this wall, the grooves being sufilciently deep to intersect the pockets 40. The grooves also assist in cooling the ring I1 and piston assembly by 'increasing the surface of the ring for radiation _and the »wiping action of the air as the clutch rotates. . ~ l It wilibe observed that the piston assembly 1n’ the retracted position illustrated in Fig. 1 sub stantially fills the cylinder 20. Where air is em- i ployed as the actuating medium and a quickly re sponsive action is desired, it is important in view axial passage 26 which extends part way through ‘ ' the shaft I0.. Seals of this type are well known of the highlycompressiblenature of~ air that the in the art. The inner end of the passage 2B com- ' municates with radial 'passages 21 in the shaft. 30 volume o_f airbehind the piston in its retracted each of which is aligned with a radial passage 28 . v"position-be held to a minimum. of larger diameter in the hub I2 and the outer end of each passage 28 is closed by a plug 29. Longi-_ t'udinal passages 30 in the hub connect .the sev- f eral passagesy 28 with/'radial recesses'3l in the 35 ring I1,'the outer en of the recesses communi cating with the cylinder> 20. The difference in _diameters of the passages 21 and 28 creates an nular shoulders 32 constituting parts of the shaft v The construc r tion shown accomplishes this result. . The clutch is characterized, particularly in the air cylinder and operating mechanism portions thereof, by simplicity and compactness, ready ac-~ cess for repair and replacement, and long life of the parts by reason of the cooling and piloting features. ‘ - ' ’ ' I claim: ` surface and a seal ring 32a is compressed against 40 l ' .1. _A fluid-operated clutch comprising in com - bination, a hub, friction members having toothed _each of the shoulders by a nut 33 threaded in the connection with the hub anda separate rotary inner end of tlîe associated passage 28 to preventI part, respectively, a ring member Vabutting one air leakage -along the shaft. ' end of the> hub and forming therewith an an When air under pressure is supplied to the cyl-` inder 20„the piston assembly, including the pres 45 nular cylinder for receiving the ñuid medium, an annular piston movable in the cylinder, a clutch sure plate 24, -is-'moved toward the left from the position shown in Fi'g. 1 to that indicated in Fig. pressure plate having toothed connection with - -` 3, thus clamping the plates I5 and lli-against the the hub, the plate being piloted in the cylinder thrust of the ring I1 is 'and movable in one direction by the piston, ‘a taken by the cap screw I8. Upon release 'of the 50 plurality of bolts spaced -around the plate, each air pressure, the clutc plates are freed for re _ having a head loosely fitting within a socket pro ^ turn to the vrelease position shown in Fig. 1 by vided in the plate and having a shank extend means of _a spring actuated bolt arrangement ing loosely through and into a .correspondingly which constitutes a feature of the invention. Ex positioned pocket in the member, and a helical ' tending inwardly-from the clutch plate, contact spring encircling each shank between an abut ing face of the pressure plate 24 is a, plurality of _, ment thereon and the base of the associated 'f-iiange I3. The reactivlg » circumferentially, spaced sockets 34, each of which loosely receives lthe head 35 of a >spring~ bolt- 36 whose shank extends loosely through apertures 38 pocket for shifting the plate in the opposite Y direction. 2. A fluid operated clutch comprising in com and 39 provided, respectively, in the plate 24 and 60 bination, a hub, friction members having toothed the inner end of the wall I9 and thence'into a connection with the hub and a separate rotary pocket 40 disposed in aligned relation to the aper-_ , part, respectively, a ring member abutting one tures in the wall I9 and plate 24. 1 ‘ j_'endof the hub andvforming therewith an an A helical spring 4I encircles that portion of .nular cylinder for receiving the fluid medium, ,each shankv winch is included within 1the asso 65 an annular piston movable in the'cylinder, a , ciatecl pocket, one end of the springî seating against the base o-f the pocket 'while the' opposite end abuts a sleeve nut 42 that is threaded on the shank and slidably fits the pocket wall. When the " - clutch pressure plate having toothed connection with the hub, the plate being piloted in the cyl-inder and movable in one direction by the piston, a plurality of bolts spaced around the plate, each _clutch is engaged, the springs are compressed. 70 _ having a head loosely ñtting within asocket pro- , The loose mounting of the bolts 36 in the pres vided in the plate and having a shank extendingsure plate 24 and wall I9 enables these bolts to loosely through and into a correspondingly posi operate freely and without strain as the'teeth of tioned pocket in _the member, the head and socket thepressure plate Wear. This wear would permit small rotational movements of the plate 24 rela 75 vwall having interengaging. formations preventing 2,412,436 5 rotation of the bolt, and a helical spring en circling each shank between an' abutment there on and the base of the associated pocket for shifting the plate in the opposite direction. 3. In clutch construction wherein a pressure plate has a toothed connection with `a rotary member and is shifted in one direction to engage the clutching members, means for shiftingthe plate in the opposite direction comprising a plu rality of bolts spaced karound the plate each having a head loosely fitting within a socket provided in the plate and having a shank ex- ' tending loosely through and into a correspond lngly positioned pocket in the member'whereby the bolts may move angularly relative to the plate, and a helical spring encircling each shank between an abutment thereon and the base of the associated pocket. 4. In clutch construction wherein a pressure plate has a toothed connection with a rotary member and is shifted in one direction to engage the clutching members, means for shifting the plate in the opposite direction comprising a plu- g rality of bolts spaced'around the plate each hav ing a head looselyfltting within a socket provided in the plate and having a shank extending loosely through and into a correspondingly positioned pocket in the member whereby the bolts 'may move angularly relative to the plate, the head and socket wall having interengaging formations 30 preventing rotation of the bolt, andaI helical spring encircling each shank between an abut ment thereon and the base of the associated pocket. 5. A ñuid operated clutch comprising a hub having an annular cylinder for receiving the fluid medium, an annular piston movable in the cylinder, a clutch pressure plate having toothed connection with the hub, the plate being mov able in one direction by the piston, a plurality of bolts spaced around the plate, each having a head loosely ñtting within a socket provided in the plate and‘having a shank extending loosely through and into a correspondingly positioned pocket in themember, and a helical spring en circling each shank between an abutment there on and the base of the associated pocket for shifting the plate‘in the opposite direction. 6. A fluid operated clutch comprising a hub having an annular cylinder for -receiving‘the fluid medium, an annular piston movable in the cylinder, a clutch pressure plate having toothed connection with the hub, the plate being movable in one direction by the piston, a plurality of bolts spaced around the plate, each having a head loosely fltting'within a socket provided in the plate and having a shank extending loosely through and into a correspondingly positioned pocket in the member., the head and socket wall having interengaging formations preventing rotation of the bolt, and a helical spring en circling each shank between an abutment there on and the base of the associated pocket for shifting the plate in the opposite direction. mnRY H. VANDERZEE.