Description
c , ci . August Pew DEv 1s , 1942. -CHAGEMECHANISM SPEED filed May 27 ' 1940 formed between a hub 32 in the inner flange 29 and an outer cylindrical flange 33 of the base Dlate 29 is an annular chamber 34 , which serves as a pressure cylinder is supplied with fluid pressure such as oil , through the pipe 35 . The inner surfaces of the hub 32 and flange 33 are precision machined cylindrical surfaces parallel to formitwo between which the ring-shaped piston 36 is slidably mounted . Sealing ring 31 in the piston 36 and the sealing ring 38 in the socket 32 to seal the piston fluid -tightly in its cylinder 34 . Note that the piston 36 acts as a pressure plate to the corresponding brake , designated A.A similar brake , designatedv B, is performed by the stationary sleeve 39 properly secured within the housing ` I4, and acts as a bearing for the shaft 4I ) I6 planetary gear drive which rotates within the bushing interposed 4I the hub 40 and the inner flange 42 of the sleeve 39 . The non-rotating brake plates 43 and 44 are mounted on the flange 42, the plates 44 is splined for non-rotatably limited axial movement . Interposed between these brake plates 44 are fixed brake cooperate 43.and 45 platesy no ' striated rotatably inside the drum surface 46 ' aligned with the brake drum 24 A. The inner surface of the drum 46 is provided with an internal ring gear 41 , with which the large planetary gear pinions 20 mesh I9 . Drum 46 with clutch plates 45 can rotate relative to the fixed brake plates 43 and 44 .An annular pressure cylinder 48 , supplied with low pressure vfluid tube 49 is formed between the walls of the sleeve 39 and the ring-shaped piston 50 , which acts as a pressure plate for the brake B and is constructed and arranged brake piston 36 as A.Actuating the respective cylinders 34 and 48 brake A and B are connected by respective tubes 35 and 49 to a three-way valve I located in the cab , or the like , and driven by a suitable lever 52 to connect to either tube 35 or 43 to the pressure line 53 supplies fluid pressure from a suitable source, vnot sample.In operation of the form of the invention illustrated in FIGS ` . 1 and 2 ' , and assuming that it is desired that the low speed transmission , rotates loperator valve control lever 52 to the low speed position L on the dial of the valve, thereby connecting high pressure source thel through tube 53 . A line 35 leading to the cylinder 34 of a brake . Fluid pressure in the cylinder 34 causes piston 36 ' to urge the brake plates 25, 26 and 21 in braking engagement . thus keeping the drum 24 and stationary ring 23 . Accordingly, as drive rotates - I6 disc , the planet gears drive the I3 I9 and impeller driven element I2 directly through small gears - 2 | interposed between the gears 22 and 23. Meanwhile, the brake B is disengaged planetgears large wings I9 driving perform no function .For high vspeedoperation , v lever4 52 moves in the 4th indicate thedial H , resulting in the disconnection of pipeV pressure pipe 53 and the connection vthereof to the discharge pipe 54 so that a brake is disengaged . At the same time tube 49 is connected to pressure line 53 , the pressure supplied to the cylinder 49, piston 50 ` causing brake close B. I6 disc rotates although atvthe same speed as before , drive shaft driven andrconnectedk I2 I3 are driven at higher speed, for the reason ttat the peripheral speed of each large pinion 2u , duct around the large diameter rolls gi ar fixed ring 41 , t ' higher than the small pinion 2 | , due to the compound epicyclic gear train , as will be readily understood.The form of the invention illustrated in FIG . 3 is essentially the same as illustrated in Fig . 1 except that the driving and driven members are located at opposite ends of the transmission rather than the same end, and the larger sprockets of the planetary gears are directly connected to the driven element . Therefore, actuator member I5 ' , driven gear 55 is located at one end , and the driven member I3 ' , drive gear 56 is located at the opposite end . Great wings - 20 ' I9 planetary gear are directly oriented to the arts v22 ' on member driven I3 " , so when braking A dedicated , by applying fluid pressure cylinder 34 A4 as described , large sprocket 20 'roll around fixed sprocket 41' therefore leads directly driven member I3 ' and gear 56 at low speed. When the brake is disengaged by releasing a pressure in the cylinder 34' and is engaged by brakeB applying pressure to the cylinder 48 ', small gears 2 | are powered directly through its connection to the fixed ring gear 23' . Since the peripheral speed of large sprockets 20 ' is larger than the small pinion connected 2I ' because of their greater. diameter driven member I3 , 'and the gear 56 is driven at high speed.I
t will be seen that the same train of gears in the transmission of this invention is capable of functioning both as a simple epicyclic compound , thereby reducing the number of gears ` generally necessary to obtain the same result. Furthermore,Note that the brake actuating cylinders 34 and 48 are stationary at all times , so there is no blocking CanBe brake by reason of oil sludge accumulated in the cylinder is forced against the presser plates by force centrifuge as is often the case when using brakes rotation. And this is of great importance in aircraft installations that require absolute reliability . Other advantages of compactness , simplicity and accessibility are apparent from the foregoing description.While certain preferred embodiments of the invention have been illustrated and described herein ,I will be understood that the invention is not limited thereto but is susceptible to changes in form and detail in the appended claims Ofthe sco'pe . For example, although two speeds are provided for in the described embodiments may be provided three or more in the same manner by simply increasing the number of planetary gears, sprockets and adding a corresponding number of ` operation clutches and cylinders.V
Claim:
1. In the speed change mechanism , the combination of an actuator , a driven member , planetV gears carried by said drive member , eachof said gears comprising at least '. relatively rotating two pinions of different diameters , the driving of the connections between one of said sprockets and the driven member , a ring gear meshing with each of the same diameter sprockets a brake member carried by each of said gear ring, a stationary brake member for cooperating with each of said brake elements of the crown, a pressure plate to engage each - set of brake elements and corresponding crown holding steady , ` said plate constituting a piston a stationary cylinder , a fluid pressure source'of , a connection pipe that source to each of said cylinders , and a valve interposed in each of said tubes to selectively control the pressure supply to said cylinder iiuid for operatively connecting corresponding planet pinion between said driving and driven . ITwo . In changemechanism speed, V - tion combination an actuating element , driven element , planet gears carried by one of said members , each of said gears comprising " at least two relatively rotatable pinions ` different diameters, the driving connections between one of said pinions and one oi these elements , ' a ring gear meshing with pinions Ofthe same diameter each , means for holding each of said stationary ring gear , said clamping means comprising an element of each.ring brake gear and brake element ha iiuid a pressure cylinder for each of said brake members , a piston in each cylinder cooperating with said braking element and ring gear coaxally prepared therewith stationary operatively connected to one corresponding set of brake elements to control the engagement and disengagement ` thereof, a source of fluid pressure connected to each cylinder , and a valve interposed in said connections last - named for regulating the supply pressure respond to fluid cylinder for controlling cORI operative connection corresponding planet of engagement between the driving and driven . iThree . In the speed change mechanism , the combination of an actuating element , an element driven, planetary gear carried by one of saidmembers ,`` Each said gear comprising at least two relatively rotatable pinions diii'erent diameters , one direct connectionbetwen sprockets only one diameter and the other of said cylinder mem - ` annular fluid pressure for each set of elements brake ' disposed adjacent to the outermost ends of said ring gear member and arranged coaxially therewith, an annular piston axially movable in each cylinder of said brake elements to control the engagement and disengagement thereof, and means for ` control iiuid pressure supply to each of said cylinders for the retention and release of the toothed rim corresponding to the corresponding ` combination operatively connected between said planet pinion drive and driven .May . A speed change mechanism , the combination of a stationary housing , the driving and driven elements rotatably mounted on and extending axially of said housing , a plurality of planetary gears ' supported by said drive element for rotation body therewith, each of said gears com ` comprises a pair of relatively non rotatablepinions of different diameters , a pair of drums arranged coaxially with ` said elements within said housing, an internal ring gear adjacent the inner end of each of said drums , each ring gear meshing with the sprockets AL1 having the same diameter as a drive connection between one set of diameter sprockets and said driven member Vsame ` a brake member adjacent the outer end of and within each of said drum and rotatable therewith, ` brake elements attached to each end members a ring gear which surrounds and meshes with " all the gears of a diameter 'a ring gear drum carryingeach and arranged for rotation coaxially with said elements, one fixed brake member `and` extending inwardly from the inner surface of each drum, a fixed brake element disposed within i , eachdrum arranged for cooperation with each of such elements drum, a fluid pressure cylinder ' for each set of said braking elements and having a piston therein coaxial with said drums adjacent to their outer ends " for controlling the engagement and disengagement thereof, and iluid means for supplying under pressure to each of said cylinders corresponding to the brake to maintain the corresponding drum and stationary ring gear , ` so that the corresponding effect planetgear diameter sprocket driving relationship between said drive and driven through` pinions connected directly said . gApril . In the speed change mechanism , the housing combinasaid disposed within each of said drums and towards the inside of the brake elements in said drums , one cylinder at each end of said housing adjacent to the outer ends of said drums , pistons movable in said cylinders to engage the brake drum ` onsaid elements and force latterinto l engagement with the brake elements in said training a drivingmember ` , ` a driven member axially aligned therewith, ` a plurality of planetary gears carried by said drive member for rotation thereby ` body , each of said gears comprising a plurality of gears relatively rotatable ` no different diameters driving connections between one of said pinions and said driven member , a ring gear that member engages each of the gears themselves around the same diameter ` element coaxially disposed within and rotatable with each housing of said gears therebyhold ring against rotation, and means for controlling the supply pressure cylinderfor said fluid ' or releasirg holding corresponding ring gear . `June . A speed change mechanism , the combination of drive and driven , a plurality of planetary gears carried by said one member for rotation therewith body , each of said gears comprising a pair of relatively non-rotatable pinions ` of different diameters , a pair of drums dis - posed ` coaxlally with said members, internal ring gear adjacent the inner end of said battery , each ring gear meshing with pinions all oi the same diameter , Va drive connection between one sprocket sets of the same diameter and the other of said members, a bralring'ele - ` ing from adjacent the outer end and slide axially within each of said drums and rotating therewith i , stationary brake elements arranged said driving and driven , a brake on each of said drums , movable pressing members to engage the brake elements and force sliding the latter in engagement with the stationary brake Velements to thereby maintain said gears against rotation ring and means for selectively moving said pressure elements to hold or release the corresponding ring gear .
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