Abstract: A speed transmission apparatus containing a first rotary crankcase, a double planetary gearset, a first rotation transmission arranged at an intermediate output of the first gearset, a second rotation transmission arranged at an intermediate input of the second gearset, a first intermediate shaft arranged in one of the first and second transmissions, a first electric compression brake acting on the first intermediate shaft and capable of modifying a rotational speed thereof, a computer electrically connected to the first compression brake, and an electrical connection capable of being provided between the first compression brake and a second compression brake whereof the effect is to accelerate the second intermediate shaft by the braking effect exerted on the first intermediate shaft by the first compression brake.

Abstract: A gearset assembly includes a pinion carrier containing first, second and third long pinions pinion mutually spaced angularly about an axis, and supported for rotation on the carrier, and three pairs of short pinions, each supported for rotation on the carrier, the pinions of the first pair meshing with the first long pinion, the pinions of the second pair meshing with the second long pinion, and the pinions of the third pair meshing with the third long pinion.

Abstract: A powertrain includes a power transmission having an input shaft connectable with an engine and a planetary gear unit. The gear unit includes two planes of gears drivingly coupled to one another. A single carrier rotatably supports pinion gears from each plane of gears. A long ring engages the pinion gears from each plane of gears.

Abstract: A wind turbine gear box having a compound planetary gear arrangement having bearings providing improved reliability and with greater accessibility for servicing. The gear box has planet pinions and planet gears being rotated by a planet carrier around a sun gear which drives a final reduction stage, the final reduction stage and the adjacent end of the planet carrier being removable from the gear box housing to allow easy removal of the planet pinions and their associated bearings.

Abstract: A high ratio, double helical epicyclic gear transmission that is primarily intended for use in rotary wing aircraft employs double helical planet gears to obtain a reduction in size of the transmission, to improve the safety of the transmission, and to reduce the noise created by operation of the transmission.

Abstract: A transfer case for motor vehicles with off-the-road gear comprises a casing, an input shaft, a first output shaft, coaxial with the latter, a second output shaft, offset therefrom, a speed-reduction unit, a coupling unit and an offset drive. The speed-reduction unit comprises a central drive gearwheel, connected in a rotationally fixed manner to the input shaft, a central driven gearwheel and at least two intermediate transmissions, rotatable about spindles fixed to the casing, each with two intermediate gearwheels, one of which meshes with the central drive gearwheel and the other meshes with the central driven gearwheel, a first driven shaft, connected in a rotationally fixed manner to the central drive gearwheel, and a hollow second driven shaft, connected in a rotationally fixed manner to the central driven gearwheel, which driven shafts lead to a coupling unit.

Abstract: A composite train housing for pseudo-planetary kinematic transmission, which comprises three components namely two external ones fixed to a central one, axial posts being formed between the components.

Abstract: A carrier 2 is fixed to one end opening part of a circular cylindrical apparatus main body 1. A plurality of receiving holes 2d, which extend in parallel with a rotation axis L, are formed in the carrier 2 at the same interval in a peripheral direction. A planetary gear 4 is received in each receiving hole 2d such that the planetary gear 4 can rotate on its own axis. An inner gear 5 and a sun gear 9, which are arranged with their axes aligned with the rotation axis L of the apparatus main body 1, are disposed within the apparatus main body 1. The inner gear 5 is engaged with the planetary gears 4 at the outside thereof. The sun gear 9 is engaged with the planetary gears 4 at the inner side thereof. An engagement part between the inner gear 5 and the planetary gear 4 and an engagement part between the sun gear 9 and the planetary gear 4 are displaced from each other in a direction of the rotation axis L so that they are not overlapped with each other in a direction of the rotation axis L.

Abstract: A geared rotary actuator comprising first and second reduction gear trains, an earth for fixing the actuator in use, and an output member moveable relative to said earth for connection to a component to be moved by the actuator, said first and second reduction gear trains each including a respective rotary input member and a respective output, said first and second gear train input members being arranged in use to be driven by respective sources of rotary movement and said gear trains having fixed, equal, step-down gear ratios between their input and output, and, the actuator further including output summing means interconnecting said outputs of said first and second gear reduction trains with said output member of the actuator whereby movement of said output member relative to said earth in response to rotation of said gear train input members is the sum of the movements of said gear train outputs.

Abstract: An electronic drive unit assembly independently drives each drivable wheel on a heavy-duty vehicle. The drive unit assembly includes a spindle that defines an inner chamber and which is mounted to a vehicle structure. A wheel hub is mounted for rotation relative to the spindle. An electric motor is mounted within the inner chamber and has an output shaft that is operatively coupled to a reduction gear assembly that is used to drive the wheel hub. The reduction gear assembly includes an inner ring gear mounted to the spindle and an outer ring gear mounted to the wheel hub. An inner set of planet gears is in meshing engagement with the inner ring gear and an outer set of planet gears is in meshing engagement with the outer ring gear. A planetary spider assembly rigidly connects the inner and outer sets of planet gears. The inner planet gears have a different number of teeth than the outer planet gears to achieve the desired gear reduction.

Abstract: A wind turbine gear box having a compound planetary gear arrangement having bearings providing improved reliability and with greater accessibility for servicing. The gear box has planet pinions and planet gears being rotated by a planet carrier around a sun gear which drives a final reduction stage, the final reduction stage and the adjacent end of the planet carrier being removable from the gear box housing to allow easy removal of the planet pinions and their associated bearings.

Abstract: A planetary gear set including a plurality of pinions meshing with a sun gear and a carrier C that shaft-supports the pinions. The carrier has an annular peripheral wall that extends entirely around outer peripheries of the plurality of pinions. Thin-wall portions receded at a radially inner side are formed in the annular peripheral wall, at circumferential-direction positions corresponding to the positions of the pinions.

Abstract: A two-stage gear mechanism includes a drive shaft having a first gear stage disposed in a fixed housing and containing planetary wheels. The two-stage gear mechanism also includes a second gear stage, driven by the first gear stage and meshing with a drive shaft. Each of the planetary wheels is formed as a stepped double gear wheel with a first gear wheel that engages the drive shaft, and with a second gear wheel that points toward the direction of the output side. The bearing axles of each of the planetary wheels are disposed spatially fixed within the housing. The second gear wheels of the planetary wheels mesh with a hollow wheel of the second gear stage, the hollow wheel being non-rotationally coupled to the drive shaft.

Abstract: A gear train has a sun gear with a tooth count e, n (where n is a natural number of 2 or more) planetary gears having a first gear part with a tooth count z1 meshing with the sun gear and a second gear part with a tooth count z2, a fixed internal tooth gear with a tooth count I1 meshing with the first gear part of the planetary gears, and a movable internal tooth gear with a tooth count I2 meshing with the second gear part of the planetary gears, where tooth counts e, z1, z2, I1 and I2 are each a multiple of n. Even if the gear form of each gear has a small module, a planetary gear train mechanism can be configured without raising operating or assembly problems, and it can be miniaturized more than conventional gear trains while still have a sufficient gear reduction ratio.

Abstract: An electronic drive unit assembly independently drives each drivable wheel on a heavy-duty vehicle. The drive unit assembly includes a spindle that defines an inner chamber and which is mounted to a vehicle structure. A wheel hub is mounted for rotation relative to the spindle. An electric motor is mounted within the inner chamber and has an output shaft that is operatively coupled to a reduction gear assembly that is used to drive the wheel hub. The reduction gear assembly includes an inner ring gear mounted to the spindle and an outer ring gear mounted to the wheel hub. An inner set of planet gears is in meshing engagement with the inner ring gear and an outer set of planet gears is in meshing engagement with the outer ring gear. A planetary spider assembly rigidly connects the inner and outer sets of planet gears. The inner planet gears have a different number of teeth than the outer planet gears to achieve the desired gear reduction.

Abstract: A planetary gear set comprises a plurality of pinions P1, P2 meshing with a sun gear, and a carrier C that shaft-supports the pinions. The carrier has an annular peripheral wall 12 that extends entirely around outer peripheries of the plurality of pinions. Thin-wall portions 12a receded at a radially inner side are formed in the annular peripheral wall, at circumferential-direction positions corresponding to the positions of the pinions. The circumferential continuity of the annular peripheral wall secures a carrier rigidity. The formation of the thin-wall portions avoids interference between each pinion and the annular peripheral wall without involving an increased diameter of the carrier. The pinions P1 have a smaller diameter than the pinions P2. A platy wall portion 32 of a bridge portion 3 extends in the direction of a circumference of the carrier, outwardly of the pinions P1.

Abstract: A generator drive for matching the rotation speed of a gas turbine to an electricity generator, The drive from the gas turbine is introduced by a sun wheel into planet gears of a first epicyclic gear stage and is driven via further planet gears of a second epicylic gear stage, which are each arranged on a common planet gear shaft with the planet gears of the first gear stage, by an annular gear to the generator. The planet gear shafts are mounted in bushes which can each be inserted complete with the planet gears into openings on a supporting wall of the drive. With respect to their distances from the bearing, the planet gears are arranged on the planet gear shaft such that the moments which result from the circumferential forces about the bearing essentially cancel one another out.

Abstract: A powertrain has a planetary transmission having a planetary gear arrangement and six torque transmitting mechanisms that are controlled to provide six forward ratios and a reverse ratio. The planetary gear arrangement includes two sun gear members, two ring gear members, and a planet carrier assembly member that are disposed in three axially spaced planes of gear mesh. The planet carrier member has a short pinion gear member, meshing (first plane) with one sun gear member, a first long pinion gear member having a small gear section, meshing (first plane) with the small pinion gear member and one ring gear member, and a large gear section, meshing(second plane) with the other sun gear member, and a second long pinion gear member, meshing (second and third planes) with both the large gear section (second plane) and the second ring gear member (third plane).

Abstract: A planetary carrier supports a plurality of short pinions and long pinions and includes a first supporting wall supporting one ends of the short pinions and the long pinions, second supporting walls supporting the other ends of the short pinions, third supporting walls supporting the other ends of the long pinions, first connecting walls connecting the first supporting wall and the second supporting walls, pairs of second connecting walls facing each other, arranged on both sides of each long pinion in the rotational direction of the carrier, and connecting the second supporting walls and the third supporting walls, and third connecting walls connecting each pair of the second connecting walls to each other on at least one of the radial inner side and the radial outer side of each long pinion.

Abstract: A planetary gear arrangement includes a gear housing, a first shaft and a second shaft located coaxially opposite each other, an internal geared wheel, a sun wheel torsionally fixedly connected to the first shaft, a planet carrier that forms a rotatably supported constructional unit together with the second shaft, and several step planets that are rotatably supported in the planet carrier. Each step planet includes two connected planet wheels with different effective diameters, whereby the larger planet wheels intermesh with the sun wheel, and the smaller planet wheels intermesh with the internal geared wheel. Each planet wheel is arranged as a separate unit and is rotatably supported on both sides in the planet carrier respectively via at least one roller bearing, with high stability under load. The two planet wheels of each step planet are coupled to each other in a torsionally fixed manner via an additional shaft that engages each planet wheel in a positive-locking manner in the circumferential direction.

Abstract: A gear reduction gearbox connected to a gas turbine engine to reduce the shaft speed and increase the output torque. In one form of the present invention an input shaft and an output shaft are rotatable within a mechanical housing. A face gear set connects between the shafts for changing the speed of the output shaft relative to the input shaft. The present invention, in one embodiment includes load sharing wherein a plurality of pinion gear assemblies distribute the load transmitted through the gearbox.

Abstract: A planetary gear device (20) comprises a front-stage side planetary gear mechanism (21) and a rear-stage side planetary gear mechanism (23). The rear-stage side planetary gear mechanism (23) comprises an internal gear (25), a carrier (29) rotatably supported by a pair of main guide bearings (26,27) disposed on both sides of the internal gear (25), a plurality of planetary gears (31) rotatably supported on a plurality of planetary shafts (30) extending between a pair of carrier parts (28A,28B) of the carrier (29), a sun gear (33) formed on an outer circumferential surface of a pinion shaft extending in a direction of a device axial line (20a) to pass through the carrier (29), and an output shaft (34) connected to the carrier (29) and extending in the direction of the device axial line (20a).

Abstract: A planetary gear has two axially adjacent ring gears (11, 12), several planet wheels (10) mounted inside a planet carrier (2) so as to rotate and a central sun wheel (1). Between two planet wheels (10) is provided each time an intermediate shaft (6) and each shaft has two sets of teeth (7, 8), the smaller set of teeth (8) being provided for simultaneous engagement with two adjacent planet wheels (10) between which the intermediate shaft (6) is situated, and the second set of teeth (7), the reference circle of which is larger than that of the first one, engages with the central sun wheel (1).

Abstract: An improved gear transmission is disclosed having a constantly variable mechanical advantage. This is accomplished by providing two transmission paths for power transmission between the input and the output of the transmission. The transmission comprises a gear casing, an input shaft rotatably mounted in one end of the gear casing, and an output shaft rotatably mounted in the other end of the gear casing (coaxial to the input shaft). At least one offset shaft is rotatably mounted in the gear casing parallel to the input and output shafts and spaced therefrom. A first sun gear is mounted on the input shaft, and a second sun gear is mounted on the output shaft. A pair of planetary gears is mounted on the offset shaft, and one engages the first sun gear while the other engages the second sun gear.

Abstract: An automatic transmission comprising a housing (12); a planetary gear train (14) mounted within the housing; an input drive shaft (16) for providing input drive to the planetary gear train; an output drive shaft (18) connected with an output drive from the planetary gear train; a first clutch (C1) connected between the input drive shaft and a first drive input (22) to the planetary gear train; a second clutch (C2) connected between a first reaction input (28) to the planetary gear train and the housing; a third clutch (C3) connected between a second reaction input (30) to the planetary gear train and the housing; a fourth clutch (C4) connected between a third reaction input (32) to the planetary gear train and the housing; and a fifth clutch (C5) connected between a second drive input (24) to the planetary gear train and the input drive shaft; wherein for first forward gear ratio the first and second clutches are engaged; for second forward gear ratio the first, second and third clutches are engaged; for thir

Abstract: A gear assembly is used to adjust the phase of a plurality of rotating driving devices, such a rotary cover cams in a collecting and folding cylinder. The plurality of rotating driving devices can be phase adjusted with respect to each other through the use of individual sets of planetary gears. The planetary gear sets are coaxially and successively arranged on a shaft.

Abstract: The present invention is related to a compact automatic gear change device for a bicycle in which all of the sprocket wheels (1) and (2) mesh by means of an intermediate moving element (3) and are equipped with anti-reverse pawls automatically controlled by mechanical or electronic tachometers. A first device is a line gear cluster incorporated in a sealed housing and connecting the bottom bracket spindle to the wheel spindle by completely eliminating the drive chain. A second device is composed of coaxial sprocket wheels driven by three intermediate moving elements (3) positioned on the inside, whereas the starting teeth of the wheels (1) and (2), the pawls (4) and (5) and the tachometers are positioned on the outside. The assembly is housed in two sealed housings (44) and (46) that rotate over one another. This compact cylindrical device can be positioned on the wheel or on the bottom bracket with a drive chain.

Abstract: A planetary transmission has a plurality of axially arranged planetary gear units each including sun gears, planet gears in mesh with the sun gears, and ring gears coaxial with the sun gears and in mesh with the planet gears, the arrangement being such that one of the ring gears in each planetary gear unit is blocked from being rotated while the other ring gear is made rotatable for allowing an output to be taken out, upon which the ring gear of which rotation is blocked is made selectable for changing over the reduction ratio, and a smooth bilateral change-over of speed change can be realized by executing the change-over between rotation-blocked and rotation-free states of the ring gear by means of a one-way clutch capable of releasing the rotation blocking.

Abstract: A gear-reducing, torque-multiplying gear drive assembly includes input and output shafts journaled by a case for rotation about a common first axis. A rotary cage is accommodated within the case and is fixed to the output shaft. A bevel drive gear is fixed on the input shaft. Input and output bevel gear sets are mounted on planet shafts carried by the cage in spaced, parallel relation to the input bevel gear. A set of transversely arranged idler bevel gears couple the drive gear to the input planet gears. The output planet gears are enmeshed with a stationary sun gear. Rotating the input shaft rotates the planet gears through the transverse idler bevel gears, which in turn rotates the cage and output shaft.

Abstract: A planetary gear having step planet gears is generically a Wolfrom gear which permits large ratios. Transmission of this type are used mainly in the handling technology. In order to improve the portability, friction, vibration and noise characteristics, step planet gears with separate toothed regions of the step gears are used. The modules of the step gears are graduated. The number of teeth is identical. Each of the teeth engagements with the ring gears can be optimized. The teeth on the step gears are preferably honed.

Abstract: Power transmitting device wherein power received from drive source (22) through an input member (44) is distributed to two side gears (12, 14) engaging respective pinions (16, 18), so as to permit differential rotation of the side gears, through differential case (10) which houses the side gears and rotatably supports the pinions, and through a partition wall (42) which is interposed between the side gears so as to be rotated with the input member and the differential casing.

Abstract: An actuating mechanism for adjusting the swashplate angle in a Stirling cycle engine. A stationary mounted motor is used to drive one member of a planetary gear set. The motion of this member is transmitted through a second planetary gear set to a member connected to the swashplate. In one embodiment, a worm gear powered by a stationary mounted electric motor drives a moveable rear ring gear. The movement of the rear ring gear is transmitted through three rear planet gears and a common sun gear to produce relative movement in a front planet gear carrier. The relative movement of the front planet gear carrier is transmitted through a bevel gear to the swashplate. This embodiment allows the off-line production of swashplate actuator subassembly cartridges that can quickly be journalled to the drive shaft, joined to and properly phased with respect to the swashplate and meshed with a worm gear connected to the stationary electric motor during the assembly of a Stirling engine.

Abstract: A jam-tolerant geared rotary actuator, capable of performing in a normal operating mode and a jam-tolerant operating mode, which includes: an output spline member for releasably connecting the movable ring gear to the output ring; a decoupling member which includes an input shaft disposed within a hollow timing shaft, and a shear member for sensing excessive torque and initiating the jam-tolerant mode; a sun gear spline member for connecting the sun gear to the hollow timing shaft; an axial displacement member for engaging the output spline member with the movable ring gear and the output ring; and an input engagement member for releasably connecting the axial displacement member to the input shaft. The axial displacement member includes a decoupling bushing and a double threaded decoupling nut. The nut is disposed between the timing shaft and the decoupling bushing.

Abstract: A drive system has a pair of planetary gear sets located between an input shaft and an output shaft with an intermediate shaft located between the pair of planetary gear sets. A series of oil shear brakes and clutches allow the drive system to operate in neutral, high speed forward, high speed reverse, low speed forward and low speed reverse. These operating modes are selectable without having to stop and reverse the input shaft which is allowed to rotate constantly in the same direction during all of the above operational modes.

Abstract: A planetary gear transmission gear system comprises a main planetary gear train composed of a main sun gear, a main ring gear, and main planet gears. The main sun gear is driven by an input rotary shaft to rotate. A sub planetary gear train is included to have a sub sun gear, a sub ring gear, and sub planet gears, and has a different gear ratio from the main planetary gear train. The sub sun gear is connected to rotate together with the main sun gear. A common carrier supporting the main and sub planet gears is rotatable about a common center axis and is drivingly connected to rotate an output shaft. A lock mechanism releasably fixes the main ring gear in order to allow the main planet gears to rotate about the center axis as the main sun gear rotates with the main ring gear fixed. A one-way clutch is connected to permit the sub ring gear to rotate in a first direction and to prohibit the sub ring gear from rotating in a second direction opposite to the first direction.

Abstract: A two-speed press drive is manufactured as a complete assembly eliminating the requirement that the drive be assembled at the location of the press. The two-speed drive includes a stationary quill, an output shaft and a planetary gear set. The planetary gear set includes a first sun gear connected to the stationary quill, a second sun gear rotatably connected to the stationary quill, a planetary gear carrier rotatably connected to the stationary quill and three compound planetary gears rotatably connected to the carrier and meshing with both the first and second sun gears. The input to the two-speed drive is through the planetary gear carrier. A high speed clutch connects the carrier directly to the output shaft for high speed operation. A low speed clutch connects the second sun gear to the output shaft for high speed operation. A housing in conjunction with the carrier define a sealed cavity within which the components of the drive operate.

Abstract: This invention relates to high reduction planetary transmissions that do not use internal ring gears and particularly planet gears that are the support for the planet carrier and in some cases the planet carrier may be used as a support bearing for the input shaft relative to the stationary and output gears with which they mesh. The floating is accomplished by providing means to let the carrier move radially in response to unbalanced forces from the planet gears. The floating of the planet gears improves the alignment between the intermeshing gears and the balancing of the load between the planet gears. A speed reducing device placed between the input shaft of the transmission and the drive means is used to decrease the speed of the input shaft to decrease the centrifugal force on the planetary pinions as they rotate around the sun and output gears.

Abstract: An actuator comprises a housing member including a motor compartment and a gear compartment, the gear compartment having inner teeth formed on the inner periphery thereof, a motor having a rotary shaft with a motor gear mounted thereon, the motor being housed in the motor compartment in such a way as to permit the motor gear to project into the gear compartment, an output shaft projecting outwardly from the housing member, a larger diameter gear housed in the gear compartment which is rotatable about the output shaft and held in mesh engagement with the motor gear, a smaller diameter gear disposed coaxially with the larger diameter gear and rotatable in conjunction with the rotation of the larger diameter gear, a planet gear held in mesh engagement with both the smaller diameter gear and the inner teeth formed in the gear compartment so that the planet gear can shift its engagement position with respect to the inner teeth as the smaller diameter gear rotates, and a rotary member engaging the planet gear for r

Abstract: The invention is directed to an arrangement for displacing the parts of an objective with at least one adjusting ring 6. A fine adjusting ring 40 is also provided and there is no switchover device which must be actuated by the operator. The fine adjusting ring 40 is at standstill when it is not actively rotated by the operator. A coarse adjusting ring 6 is rotatably journalled in the housing 10 of an objective. A transmission or gearing for suitably fine adjusting this coarse adjusting ring 6 includes a sun gear wheel 1 mounted fixedly on the objective housing 10, a fine adjusting ring 40 which includes a shaft pin 4 on which planetary gear wheels 2 are journalled and an output gear wheel 3 rotatably mounted on the coarse adjusting ring 6 via a slip clutch 5.

Abstract: A motor vehicle integral speed reduction and wheel mounting unit having a driven rotatable axle pivot member with axially spaced annular bearings mounted on the outer surface. An annular fixed axle housing has an inner surface mounted on the bearings. A ring gear is formed on the axial portion of the inner surface of the axle housing located between the bearings. Intermediate shafts are rotatably mounted in the axle pivot member and a gear is fixed on each intermediate shaft. Each gear is located partially within a radial recess formed in the axle pivot member. One end of each intermediate shaft extends out of the axle pivot member and is connected to a drive shaft by a planet gear fixed on the end of the intermediate shaft.

Abstract: A transmission including composite planetary gears supported by a carrier such that the planetary gears are arranged around an axis of the carrier, each planetary gear consisting of a large and a small pinion which mesh with a first and a second gear, respectively, and which have a ratio Zp.sub.1 /Zp.sub.2 equal to an integer not smaller than 2, wherein Zp.sub.1 and Zp.sub.2 represent numbers of teeth of the large and small pinions, respectively. The transmission is assembled by assembling the common second gear and the carrier supporting the planetary gears, such that the small pinion of each composite planetary gear meshes with the common second gear, and assembling the common first gear and the carrier such that the large pinion of each planetary gear supported by the carrier meshes with the common first gear.

Abstract: An index table utilizes oil shear brake and clutch technology in combination with a unique final positioning system in order to provide an accurate and reliable index table, the index table incorporates a two speed oil shear drive system for high speed indexing and low speed final positioning. An oil shear brake stops the table at an approximate final position at which time the final positioning system rotates and locks the index table at the correct position after each indexing of the table.

Abstract: A planetary gear system includes a sun gear coupled to an annular ring gear through a plurality of twist-planet gears, a speeder gear, and a ground structure having an internal ring gear. Each planet gear includes a solid gear having a first half portion in the form of a spur gear which includes vertical gear teeth and a second half portion in the form of a spur gear which includes helical gear teeth that are offset from the vertical gear teeth and which contact helical gear teeth on the speeder gear and helical gear teeth on the outer ring gear. One half of the twist planet gears are preloaded downward, while the other half are preloaded upwards, each one alternating with the other so that each one twists in a motion opposite to its neighbor when rotated until each planet gear seats against the sun gear, the outer ring gear, the speeder gear, and the inner ring gear. The resulting configuration is an improved stiff anti-backlash gear system.

Abstract: A planet carrier for a compound planetary gear arrangement has four side plates supporting six pinion gears. One pair of side plates, supporting three of the pinion gears, have one of the other pair of side plates disposed axially between them. This allows the pinions to be in meshing relation between adjacent side plates which are each supporting three pinions, respectively. To complete the planetary arrangement, the outer side plates are sized to permit central access at respective sun gears and outer axial access at respective ring gears. The ring gears and sun gears do not encroach upon the meshing location of the pinion gears. With the judicious use of friction clutches and brakes and two input gear sets providing ratios, the compound planetary arrangement can be controlled to provide powertrains having from five forward speeds (the four friction devices) to seven forward speeds and two reverse speeds (with eight friction devices).

Abstract: A double planetary carrier is constructed by providing separate carriers for carrying therein two sets of planet gears which are axially set apart from each other, and by connecting the two carriers together. A cylindrical portion is formed on a periphery of a side plate of one of the carriers to receive therein a side plate of the other carrier. Serrated teeth are formed respectively on a periphery of the side plate and on the cylindrical portion to connect the two carriers by means of serrations. The serrated teeth are formed so as to have a play therebetween. Between the side plates there are formed radially extending oil grooves to introduce lubricating oil into oil holes which are formed in gear shafts of the planet gears.

Abstract: This invention relates to high reduction planetary transmissions that do not use ring gears and particularly planet gears that are the support for the planet carrier. The planet carrier is entirely supported by the planet gears meshing with their respective sun and output gears. The planet gears can move in a radial direction to improve tooth alignment between the meshing gears and equalize the distribution of the torque load between the planet gears. In some cases the planet carrier may act as one of the support bearings for the input shaft.

Abstract: A stacked compound planetary gear train for an upgraded powertrain system for a helicopter that provides an increased reduction ratio to accommodate the increased horsepower output of the augmented powerplant system while concomitantly providing a baseline RPM output to the main rotor shaft. The stacked compound planetary gear train includes a driving sun gear, a set N of primary planetary pinions, a plurality of secondary planetary pinions, a compound drive shaft supporting each respective primary and secondary planetary pinion combination, a fixed ring gear interacting with the secondary planetary pinions, and a planetary carrier assembly disposed in rotatable combination with the compound drive shafts and operative to provide the output of the stacked compound planetary gear train to the main rotor shaft of the helicopter. The set N of primary planetary pinions includes a plurality N/2 of upper primary planetary pinions and a plurality N/2 of lower primary planetary pinions.

Abstract: A power transmission unit for an electric vehicle has a planetary-gear type speed reducer disposed between and connected to an electric motor and a driving wheel. The speed reducer has two planetary gear sets in which common pinions are engaged with a fixed first ring gear and a second ring gear acting as an output portion. The common pinions are supported to a common carrier acting as an input portion. The number of teeth of the second ring gear is set to be the same as the sum of a number of teeth of the first ring gear and a number of the common pinions, and the common pinions are located at equal distances. Therefore, the power transmission unit has a proper reduction gear ratio and a high-torque transmission characteristic which are required for an electric vehicle while the speed reducer is formed small in size.

Abstract: In a high ratio planetary transmission which includes in a housing coaxial input and output shafts and wherein a first sun roller structure is part of one of the shafts and disposed within the housing, a first traction ring is disposed within the housing around the first sun roller structure in spaced relationship therefrom, and a number of planetary traction rollers are supported in the space between the sun roller structure and the first traction ring, each traction roller has two sections of different diameters, one in engagement with the first traction ring and with the sun roller structure and the other being in engagement with a second traction ring which is operatively connected for rotation with the other of the input and output shafts.

Abstract: A small-sized reduction gear includes: a stationary internal gear 10; a movable internal gear 20 having an internal gear; planet gears 12 in mesh with the stationary internal gear 10 and the movable internal gear 20; a holder member 15 and a holder clamp 19 which hold the planet gears 12; and a sun gear 4 in mesh with the planet gears 12 and directly connected with a motor shaft 3. The reduction gear further includes a column beam 18 provided between columns extending upwardly from the holder member 15 and, further guide sections provided in those sections where the movable internal gear 20 and the stationary internal gear 10 are in contact with each other. This construction helps to provide a small-sized reduction gear which makes it possible to obtain a high reduction ratio with a very small number of parts, which has a high level of transmission efficiency, which involves little backlash and noise, and which excels in dustproofness and can be produced at low costs.