Abstract: A component with inner teeth (3) and outer teeth (6). The component (7) comprising a basic body (2) provided with the inner teeth (3) and a sheet component (5) provided with the outer teeth (6). The sheet component (5) is connected to the basic body (2), during the manufacturing process, by positive interlock in both the tangential and radial directions.

Abstract: The invention relates to a system intended to enable the translational movement of sliding doors and to actuate the blocking of same, whereby blocking means (14) can be actuated in a sequential and synchronised manner at the end of the translational movement of the doors.

Abstract: A fixed ratio traction drive is disclosed that uses multidiameter planet rollers. The high speed traction drive provides speed reduction from a high speed shaft. A planet carrier is used to rotationally mount the multidiameter rollers. A continuously variable transmission that uses planetary ball traction is also disclosed that provides infinitely variable speed ratios.

Abstract: A gas turbine engine includes an epicyclic gear train that drives a turbo fan. The epicyclic gear train employs a one-piece carrier in which the spaced side walls are interconnected with circumferentially spaced apart mounts to form a unitary structure. Baffles are secured to the carrier near the mounts and provide lubrication passages that spray oil onto the sun gear and/or intermediate gears arranged between the baffles. The baffles can be constructed from a different material than the carrier since the baffles are not structural components in the gear train.

Abstract: A support shaft provides lubrication to a journal bearing during windmilling operation of a gear set. A primary oil pump provides oil from an oil supply during driven operation of the fan, and a secondary oil pump provides oil from an internal sump during windmilling operation of the fan. During driven operation of the fan, oil is pumped with the primary oil pump through a primary oil flow path to an outer surface of the support shaft. During windmilling fan operation, oil is pumped from an internal sump with a secondary oil pump through the secondary oil flow path. The secondary oil flow path has a smaller flow capacity, and the secondary oil pump is a smaller capacity pump.

Abstract: A bearing arrangement has at least two anti-friction bearings which are spaced apart along a central axis. At least one bearing is configured as a tapered roller bearing, the tapered roller bearing having a number of frustoconical rolling bodies. A cone angle between a line of symmetry of each rolling body and the central axis is between 20° and 33°.

Abstract: The invention relates to a final drive assembly. An axle final drive assembly includes an axle housing, and axially inner and outer axle bearings supported by the axle housing. An axle shaft has a flange and is supported for rotation by the outer axle bearing. A planetary transmission has a planet carrier fixed for rotation with the flange of the axle shaft. The planet carrier has a neck which is supported for rotation by the inner axle bearing. The planetary transmission also has a ring gear and a plurality of planet gears which are positioned axially between the inner and outer axle bearings.

Abstract: A planetary gear drive comprises two stages. Each of two stages comprises a central sun gear, a crown gear, several satellites located on a carrier between the sun gear and the crown gear, input and output shafts. The sun gear of the first and second stages is rigidly connected to each other. The input shaft is rigidly connected with the sun gear of the first stage. The carriers of the first and the second stages are rigidly connected to each other and, the output shaft is rigidly connected with the crown gear of the second stage (first embodiment). The crown gears of the first and the second stages are rigidly connected to each other, and the output shaft is rigidly connected with the carrier of the second stage (second embodiment). The satellites are at least at one stage are unevenly distributed around.

Abstract: The present invention is aimed to provide a carrier assembly which can be made small in size while securing a sufficient fixing strength between a first carrier plate and a second carrier plate. The second carrier plate (8) has a plurality of connection elements (23) bent toward the first carrier plate (7) to weld and fix the outwardly projected end portions (23b) of the connection elements with the outwardly projected end portion of the first carrier plate (7) by electron beam welding. The connection elements each have a base portions (23a) formed with a notch (28). The notch (28) thus formed makes a gap S between the base portion of the connection element and the corner portion (29) of the pinion gear.

Abstract: A planetary wheel end assembly includes an axle shaft having an inboard end and an outboard end, a planetary gear assembly receiving driving input from the axle shaft, and a rotational support element that pilots the outboard end of the axle shaft. The planetary gear assembly includes a sun gear that is fixed for rotation with the axle shaft, a plurality of planet gears that are in meshing engagement with the sun gear, a non-rotating ring gear that is in meshing engagement with the planet gears, and a planetary spider that supports the plurality of planet gears. The planetary spider provides driving output to rotate a wheel component. The rotational support element is positioned radially between the outboard end of the axle shaft and planetary spider to allow relative rotation between the planetary spider and the outboard end of the axle shaft.

Abstract: A journal bearing includes a main body and a connection portion. The main body extends radially outward from a central cavity to an interface surface. The connection portion supports an end of the main body and extends radially around the central cavity. The connection portion has a dimension selected as a proportion of a reference dimension of the main body to achieve a desired spring rate for the journal bearing.

Abstract: A planetary gear transmission unit includes a planet carrier which supports and locates circumferentially spaced pairs of planet gears, and at least one planet shaft. The planetary gear transmission unit further includes a planet shaft locking mechanism between the at least one planet shaft and the planet carrier for preventing the at least one planet shaft from rotating around its own axis, the planet shaft locking mechanism being provided between an axial end face of the planet shaft and the planet carrier in a direction substantially parallel to the planet shaft. An advantage of the planetary gear transmission unit is that rotation of the planet shaft relative to its axis in the planet carrier is prevented. The unit results in a free of wear contact between planet shaft and planet carrier, thereby allowing all degrees of freedom of the planet shaft without disturbing the load distribution between the planet gears of a pair on one planet shaft.

Abstract: The Auxiliary Gear Box includes an Adapter Gear Housing, and a Transfer Case Adapter. The Adapter Gear Housing includes a Transmission Interface Surface, and a Posterior Surface. The Posterior Surface is in communication with the Transfer Case.

Abstract: An epicyclic gear assembly includes a ring gear, a sun gear, at least one star gear enmeshed between the ring gear and sun gear, a carrier and a journal bearing. The carrier is disposed adjacent the rotatable sun gear and star gear. The journal bearing is disposed in the at least one star gear and connected to the carrier. The journal bearing has an outer radial surface with an amorphous surface finish of less than about 5 micro inches (127 micro mm) measured on an Ra scale and the outer surface of the journal bearing interfaces with an inner surface of the star gear.

Abstract: A concentrically aligned planetary gear assembly and a power transmission device are provided. The planetary gear assembly includes a ring gear, having a bottom cover and a top cover; a graded transmission module; a power input module, having a power shaft and a power input gear; and a power output module, having a planet wheel set and an output shaft. The graded transmission module includes a planetary arm and plural planetary gears. The planetary arm has a transmission tray and a coaxial sun gear, in which the transmission tray has plural planetary pivoting structures, and an outer diameter of the transmission tray is coaxial with an addendum circle of the internal gear, so as to be slidingly fitted to each other. The plurality of planetary gears is engaged with the internal gear, pivoted on the planetary pivoting structures, and freely rotates with respect to the planetary pivoting structures.

Abstract: A system for processing an envelope containing contents has stations for opening envelopes, and a checking station for checking contents of envelopes. The opening station comprises a cutter and a drive mechanism to separately cut opposed leaves of the envelope. The cutter comprises a wheel for cutting through each of the leaves, and the drive mechanism rotates the wheel and causes it to traverse across the envelope. There is a separate wheel for each envelope leaf and the drive mechanism simultaneously drives the wheels to cut both leaves simultaneously. The cutter comprises a separator for drawing the leaves away from each other so that they are separated from the contents during cutting. The separator comprises at least one suction cup for engaging the leaf and drawing it away from the plane of the contents; and there are opposed suction cups. The separator simultaneously draws the leaves in opposing directions away from the contents.

Abstract: An arrangement for planetary gearsets comprises at least simple radially inner and radially outer planetary gearsets each comprising a sun gear, a ring gear and a carrier that carries planetary gears. The two gearsets are coaxially aligned and one of the gearsets is radially nested inside the sun gear of the other gearset. The ring gear of the radially inner gearset and the sun gear of the radially outer planetary gearset are at least coupled to one another in a rotationally fixed and are connected to a common carrier by driving teeth. To achieve a simple and inexpensive production, the ring gear of the radially inner gearset and the sun gear of the radially outer gearset are first produced as separate components with different heat treatments and then the ring and the sun gear are connected together by one of a friction force locking, a form interlocking and/or positive bonding.

Abstract: A planetary carrier assembly for a transmission includes a first carrier portion and a second carrier portion. The first carrier portion includes a spider flange portion and at least one first carrier arm half extending along the longitudinal axis. The second carrier portion includes a park gear flange and at least one second carrier arm half extending along the longitudinal axis into abutting engagement with the at least one first carrier arm half. The first carrier arm halves and the second carrier arm halves are welded together at an approximate midsection along the longitudinal axis between the spider flange portion and the park gear flange portion to minimize internal stresses within the output shaft assembly.

Abstract: A machine element having that has at least one rotationally symmetrical section which is configured like a hollow body. In the machine element at least the rotationally symmetrical section is formed from two elements of bowl-shaped design which close the machine element on the end side and in the process enclose at least one cavity.

Abstract: A planetary gearset provided with a sun gear, a ring gear, and a carrier that rotatably retains a plurality of pinion gears arranged between the sun gear and the ring gear as elements, in which one of the elements is made a fixed element and one of the other elements is made a rotating element, and which transmits torque between that rotating element and an external member provided in a location eccentric with respect to that rotating member. The planetary gearset is constructed such that the fixed element is movably retained in the direction of a load from the transmission of torque between the rotating element and the external member, and the load from the transmission of torque between the rotating element and the external member is received by a fixed portion that rotatably retains that rotating element.

Abstract: A planetary gear transmission unit (10) includes a ring gear (17), a sun gear (18) and a planet carrier (19) driving a plurality of planet shafts (12) onto which planet gears (11) are rotatably mounted by way of planet bearings (13). The planet shafts are flexpin shafts (12) and each flexpin shaft (12) includes a pair of planet gears (11), each planet gear (11) of the pair being of the single helical type having a helix angle opposite to that of the other planet gear (11) of the pair. A gearbox (20) including a planetary gear transmission unit (10) according to embodiments of the invention and a wind turbine including such a gearbox (20) are also described.

Abstract: Metal coated organic polymer compositions are useful as vehicular transmission parts. Such parts may have lighter weight, and/or superior corrosion resistance, and/or be more easily fabricated than similar conventional transmission parts.

Abstract: A planetary gear system contains: a sun gear as an input; a fixed ring gear; a planetary career as an output, a first planetary gear supported by the planetary career and engaging the sun gear; and a second planetary gear supported by the planetary career and engaging the ring gear. A first spin axis of the first planetary gear is arranged closer to a planetary career rotation axis of the planetary career than a second spin axis of the second planetary gear. Torque is transmitted from the first planetary gear to the second planetary gear.

Abstract: The pinion gear assembly thus includes a first and a second pinion gear arranged with generally parallel axes of rotation. A first and a second washer, referred to herein as stationary washers, are provided. Each of the washers has two openings spaced to generally align with two predetermined, spaced mounting locations on the planet carrier member. The first and the second washers are positioned on opposing sides of the first and second pinion gears, with the axes of rotation of the first and second pinion gears generally centered at the respective spaced openings of the washers. Because the stationary washer spans the two pinion gears, which are secured to the carrier member, the stationary member is operatively connected at two locations to the carrier member, eliminating the need for anti-rotation features and corresponding carrier features.

Abstract: A planetary gear system contains: a sun gear as an input; a fixed ring gear; a planetary career as an output; and a planetary gear unit supported by the planetary career. The planetary gear unit includes: a shaft; a first planetary gear coupled to the shaft and engaging the sun gear; and a second planetary gear coupled to the shaft and engaging the ring gear. The planetary gear unit rotates around a first rotation axis with respect to the planetary career. The planetary career rotates around a second rotation axis. The first rotation axis intersects the second rotation axis.

Abstract: A gearbox for a wind turbine includes a ring wheel unit provided in a housing; a driving shaft designed to be coupled to the rotor of the wind turbine and a single main bearing or a pair of main bearings which rotatably support the driving shaft in the housing. The ring wheel unit is formed of a sun wheel, a planet wheel, ring wheel which is fixed to the housing in a non-rotating manner and a planet carrier which is rigidly connected to the driving shaft. An additional bearing rotatably supports the planet carrier or the driving shaft relative to the housing. Between the part of the housing having the main bearing or the main bearings and the part of the housing with the additional bearing and the ring wheel, an elastic part is provided with relative torsional stiffness, yet relatively flexible to loads in the axial and/or radial direction.

Abstract: The present invention relates to a planetary gear set and a power transmitting apparatus. In the planetary gear set, a gear tooth is formed by extending one side of a planetary carrier. In the power transmitting apparatus, multi-stage transmission is enabled by reducing a rotational speed inputted from a power-driving source and then inputting the reduced rotational speed to one operational member of the planetary gear set as well as the rotational speed of a speed changing power source to another operational member of the planetary gear set.

Abstract: A drive is disclosed that is useful with a variety of apparatus for either multiplying torque or increasing rotational speed. The drive includes a supported inner shaft having a sun gear at one end, the inner shaft receivable through a hollow outer coaxial shaft having an engageable transmittance (a spur gear, for example) intermediate first and second opposite ends thereof. A planetary gear set platform is located at one end of the outer shaft, planet gears rotatably mounted thereabout in engagement with the sun gear received through the platform for rotation in a stationary ring gear. A right angle translate gear is affixed to the inner shaft adjacent an end thereof opposite the sun gear, a rotational source engagable at one of the translate gear and the transmittance and a utility output engagable at the other.

Abstract: An arrangement of two adjacent planetary gearsets (1, 2) in a housing of a transmission of a vehicle. In the arrangement a ring gear carrier (3) is connected to ring gear (19) of the first planetary gearset (1) and a sun gear (8) of the second planetary gearset (2), which is connected to a shaft (5) of the transmission, such that torque is transferred between the ring gear (19) of the first planetary gearset (1) and the shaft of the transmission (5). The ring gear carrier (3) is therefore engaged both with the shaft (5) of the transmission and with the sun gear (8) of the second planetary gearset (2).

Abstract: A positively-locking connection between two components of a transmission that have round cross-sections, designed to support axial forces. A first component to be connected has an annular flange with windows stamped out around its circumference. The windows enable simple deformation of the annular flange. The second component to be connected has an annular groove such that after bringing the two components together, the annular flange of the first component, when viewed axially, is positioned over the annular groove of the second component, such that the annular flange of the first component can be pressed radially into the annular groove of the second component so that segments of the annular flange radially engage the annular groove.

Abstract: Inventive embodiments are directed to components, subassemblies, systems, and/or methods for continuously variable transmissions (CVT). In one embodiment, a control system is adapted to facilitate a change in the ratio of a CVT. In another embodiment, a control system includes a stator plate configured to have a plurality of radially offset slots. Various inventive traction planet assemblies and stator plates can be used to facilitate shifting the ratio of a CVT. In some embodiments, the traction planet assemblies include planet axles configured to cooperate with the stator plate. In one embodiment, the stator plate is configured to rotate and apply a skew condition to each of the planet axles. In some embodiments, a stator driver is operably coupled to the stator plate. Embodiments of a traction sun are adapted to cooperate with other components of the CVT to support operation and/or functionality of the CVT. Among other things, shift control interfaces for a CVT are disclosed.

Abstract: This apparatus includes: a sun gear having external teeth; planetary gears, each having external teeth and configured to be meshed with the sun gear; planetary shafts, each being a rotation shaft of the planetary gear; a ring gear having internal teeth and configured to be meshed with the planetary gears; and a planetary carrier including an annular base plate and an annular back plate. The planetary carrier supports the planetary shafts between the annular base plate and the annular back plate and determines a relative position between planetary gears. The annular base plate is integrally formed with one end of the planetary shaft to support the one end. The annular back plate supports the other end of the planetary shaft. At least one of the planetary shaft and the planetary carrier has lower stiffness in its part adjacent to the one end of the planetary shaft than stiffness of its part adjacent to the other end thereof.

Abstract: The invention relates to a gear mechanism with at least a flange for the adaptation of the gear mechanism to a drive component and with at least one ring gear, which is firmly connected on the gear side to the flange. It is advantageous to use a connection where the flange presents at least a radial flange bore, the ring gear presents at least a radial ring gear bore, and a pin is led through a pair consisting of such a radial flange bore and such a radial ring gear bore, and in the process the flange and the ring gear are braced firmly against each other. In particular, the flange bore and the ring gear bore are arranged with at least partial overlap in the axial direction and simultaneously partial mutual offset by an offset difference.

Abstract: To fold sheets of newsprint (1), a ring gear 7 is driven in rotation by a motor 11 under the control of a controller 12 such that, for most of the time, the ring gear 7 rotates at the same speed as a folding cylinder 2 and arms 8. When it is desired to initiate a folding operation, the ring gear 7 is momentarily stopped or slowed. The relative motion that occurs between the ring gear 7 and planet gears on the arms 8 causes the planet gears 9 to rotate about their axes and respective tucking blades 6 mounted on the planet gears 9 to protrude above the surface of the cylinder 2, where they engage collated sheets on the cylinder surface and push them into the nip of folding rollers (4). Upon completion of the movement of the planet gears 9 and associated tucking blades 6, the ring gear 7 is again caused to move at the same angular speed as the arms 8, such that the tucking blades 6 retain their “silenced” positions below the surface of the cylinder 2.

Abstract: A planetary gear set centering ring for use is a planetary gear train. The planetary gear centering ring is adapted to be positioned within a gear train to center a planetary gear carrier and a set of planetary gears within a ring gear of the gear train.

Abstract: The present invention includes a drive system for use in a flowing fluid, the drive system preferably having a first turbine connected to a shaft, a first gear connected to the shaft, a second turbine rotatably mounted on a pipe, a second gear rotatably mounted on the pipe and connected to the second turbine, and two or more satellite gears in fixed locations relative to the pipe and rotatably engaged, directly or indirectly, with the first gear and the second gear. The drive system may be used, for example, in a wind generator to generate electrical energy.

Abstract: The invention provides a transmission providing a gear ratio between an input shaft and an output shaft. The transmission comprises an annulus ring, a sun wheel being rotatable around a central axis of the transmission, a planet carrier being rotatable around the central axis of the transmission, and a set of planet wheels, each wheel comprising a plurality of wheel segments with different diameters, the planet wheels being fixed in rotational bearings of the planet carrier and being arranged to rotate epicyclically around the central axis. The annulus ring and the sun wheel each interacts with one of the wheel segments e.g. via meshing toothed gear wheels. The gear facilitates various interaction means at different locations in the gear, and thus facilitates a potentially less noisy, lighter, smaller or stronger gear by use of a low amount of components.

Abstract: The present invention includes a drive system for use in a flowing fluid, the drive system preferably having a first turbine connected to a shaft, a first gear connected to the shaft, a second turbine rotatably mounted on a pipe, a second gear rotatably mounted on the pipe and connected to the second turbine, and two or more satellite gears in fixed locations relative to the pipe and rotatably engaged, directly or indirectly, with the first gear and the second gear. The drive system may be used, for example, in a wind generator to generate electrical energy.

Abstract: A horizontal axis wind turbine includes a vertically extending tower 117 having a rotatable long shaft 121. A bottom end of the long shaft drives an electric generator 122 and a top end of the long shaft is connected to a power output gear assembly of a bearing tooth angle drive 120. The power output gear assembly is engaged with a power input gear in the bearing tooth angle drive 120. The power input gear is connected by a drive shaft 86 through a preferably planetary gear drive 119 to blades 106 of a wind turbine to receive power from the wind turbine and to deliver torque to the long shaft 121 to drive the generator 122. The planetary gear teeth preferably have flat surfaces providing contact with related gear teeth.

Abstract: A roller mill for grinding particulate material, such as cement raw materials, cement clinker and similar materials has a rotatable grinding table with a substantially vertical centerline and a number of rollers being configured for interactive operation with the grinding table and turning about separate roller shafts which are fixed to a rotatable center shaft with a substantially vertical centerline. The center shaft and the grinding table are fixed one to the rotor and the other to the stator of the same motor, which may have the capability of rotating both the grinding table and the center shaft.

Abstract: A counter-rotating blade stage in lieu of a stator stage may compensate for relatively low rotational speed of a gas turbine engine spool. A first spool may have at least one compressor blade stage and at least one turbine blade stage. A combustor is located between the at least one compressor blade stage and the at least one turbine blade stage along a core flowpath. The at least one counter-rotating compressor blade stage is interspersed with the first spool at least one compressor blade stage. A transmission couples the at least one additional compressor blade stage to the first spool for counter-rotation about the engine axis.

Abstract: Planet carrier of an epicyclic gear system with planetary shafts which are connected fixedly to the planet carrier onto which planet wheels are mounted rotatably using planetary bearings, the teeth of the planetary wheels being helical or chevron teeth, the planet carrier being of a cage type, and where at least two separate planetary wheels are placed on each planetary shaft, each wheel of which being supported by at least one double-row cylindrical bearing, where the outer bearing ring of each double-row cylindrical bearing is integrated into the planetary wheel concerned.

Abstract: The present invention relates to automatic transmissions and gear trains. In particular, the instant invention relates to an automatic transmission gear train with improved resistance to deterioration with an increased effective life. The gear train of the instant invention comprises eight pinion gears assembled into one carrier utilizing a forward and a rear sun gear, a ring gear, a band drum and a one way roller clutch.

Abstract: An epicyclic gear stage for a wind turbine gearbox including a sun gear, at least two planet gears, engaged with the sun gear, an annulus gear, a first planet carrier flange connected to one side of at least two of the planet gears, and a second planet carrier flange connected to the other side of least two of the planet gears. Torque from the wind turbine rotor is transferred via a torque transfer part connected to at least one of the first and second planet carrier flanges at one or more torque transferring zones and the one or more torque transferring zones are located between a first and a second plane, the planes being substantially perpendicular to an axis of rotation of the sun gear.

Abstract: A gearbox for a wind turbine. The gearbox includes at least one first epicyclical gear stage, at least one second gear stage, and a torque transferring shaft including a shaft part and a connection part, wherein the torque transferring shaft is adapted for connecting a first gear of the first epicyclical gear stage with a second gear of the second gear stage and wherein the torque transferring shaft is connected to the second gear stage via the connection part to form a torque-transferring connection area between the connection part and the second gear stage and wherein the outer diameter of the shaft part of the torque transferring shaft is smaller than an inner diameter of the connection area between said torque transferring shaft and said second gear stage.

Abstract: A drive transmission apparatus includes a sun gear driven by a drive source, a planetary gear, a supporting member that supports the planetary gear capable of revolving around the sun gear in a rotatably engaged state with the sun gear, a driven gear that is engaged with the planetary gear when the planetary gear revolves and moves to an engagement position by the rotation of the sun gear in a first direction, and a rotational force providing unit that provides a rotational force to the driven gear to rotate the sun gear in a second direction opposite to the first direction via the planetary gear when the planetary gear is engaged with the driven gear. When the sun gear is rotated in the second direction by the drive source, the rotational force providing unit blocks the revolution of the planetary gear by rotating the planetary gear via the driven gear.

Abstract: An epicyclic gear assembly has a central toothed sun gear unit mounted on a carrier plate and plurality of planetary gear sets surrounding the central gear in torque-transmitting relationship. Each of said planetary gear sets has a toothed planet gear supported by a planet shaft, the first end of which is cantilevered from the carrier plate. A second end of the planet shaft supports the planet gear. A double-tapered concave middle portion of the planet shaft allows flexing of the shaft so as to facilitate elastic deflection of the planet shaft while distributing load between the planet gear sets. The outer circumference of the middle portion has a pair of spaced outwardly convex protrusions formed between the first end and the second end.

Abstract: A rotating power tool has a transmission assembly having a transmission casing, a common annulus, at least two planetary gear assemblies and a thrust washer assembly. The common annulus is tubular, is mounted securely in the transmission casing and has an inner surface and multiple teeth. The planetary gear assemblies are connected in series in the common annulus, and each planetary gear assembly has a sun gear, a planet carrier and at least three planetary gear assemblies. The planet carrier is an annular bracket. The planetary gear assemblies are mounted around and engage a sun gear and the teeth in the common annulus. The thrust washer assembly is mounted between adjacent planetary gear assemblies. Consequently rotation of the transmission assembly is smooth and stable. The thrust washer assembly damps reactive force to prevent damage and guarantee normal operation of the hand-held rotating power tool.

Abstract: There is disclosed herein a descent device (10) comprising a hollow spool (12) rotatable about a rotational axis (14) and a lifeline, in the form of a braided steel cable (not shown), wound about the spool (12). A centrifugal brake mechanism (18) including a brake assembly, comprising a pair of brake shoes (20) and associated brake pads (21), is engageable with the spool (12) to apply a braking force to the spool (12) as the spool (12) rotates. Biasing members, in the form of a compression springs (22), extend between the brake shoes (20) for biasing the brake shoes (20) and pads (21) into engagement with the spool (12).

Abstract: A vehicle planetary gear device includes a ring gear, a sun gear, and a carrier, and pinions housed in the carrier. A penetration hole formed in a hollow cylindrical portion of the carrier has two inner wall surfaces that face an outer peripheral surface of a pinion. One of the inner wall surfaces has a curvature radius larger than the radius of the pinion, and has a curvature center that is apart from the radius center of the pinion gear. The pinion is disposed with respect to the carrier with a predetermined space formed between the one of the inner wall surfaces and the outer peripheral surface of the pinion, and thereby slides along a radial direction of the carrier.