Abstract: A rotary body driver includes a driving source and a planetary gear transmission to receive a driving force from the driving source. The planetary gear transmission includes a sun gear rotatable by the driving force received from the driving source, a plurality of planet gears meshed with and surrounding the sun gear with an identical interval between the adjacent planet gears, a rotatable carrier to rotatably support the plurality of planet gears, an outer gear encircling and meshed with the plurality of planet gears, and an output shaft combined with and supporting the carrier. A rotary body shaft mounting a rotary body is connected to the output shaft of the planetary gear transmission to transmit the driving force received from the output shaft to the rotary body. The outer gear is made of resin and the output shaft and the carrier are made of metal.

Abstract: A welded structure and welding method make it possible to improve welding strength and welding quality. A welded structure in which a first member and a second member are joined by welding, wherein the first member comprises a second-member joining part which is joined to the second member, and the second member comprises a first-member joining part which is joined to the first member. If the direction in which the first member and the second member are arranged is the first direction, and the direction intersecting the first direction is the second direction, the welded structure comprises a cavity part which is provided between the first-member joining part and the second-member joining part, and a welded part which is provided between the cavity part and both end parts in the second direction of the joining surface where the first-member joining part and the second-member joining part are joined.

Abstract: The present invention is a fusion-bonded product having a high-strength part, comprising: a first preform (2a) constituted by integrally, frictionally pressure-welding a first low-carbon steel part (L1) made of low-carbon steel containing less than 0.45% of C and a high-carbon steel part (H) made of high-carbon steel containing not less than 0.45% of C; and a second preform (2b) having a second low-carbon steel part (L2) made of second low-carbon steel containing less than 0.45% of C; wherein the high-carbon steel part (H) of the first preform (2a) is provided with a high-strength part (9) that has been previously formed into a desired shape and quenched, the second low-carbon steel part (L2) of the second preform (2b) has been previously formed into a predetermined shape, and the first low-carbon steel part (L1) of the first preform (2a) and the second low-carbon steel part (L2) of the second preform (2b) are bonded to each other by fusion welding.

Abstract: A planetary gear unit for an automatic transmission includes a pinion carrier including a first disc formed with first holes located radially from an axis joined to a second disc spaced axially from the first disc and formed with second holes, each second hole being aligned with a first hole, a clutch ring contacting the second disc and pinion shafts, each pinion shaft extending axially through one of the first holes and one of the second holes and supporting a pinion thereon.

Abstract: An automated clutch system for transferring torque from an engine to a change gear transmission is connected to a processing unit which uses various input parameters to calculate the grade on which the vehicle is operating and its current weight to determine an appropriate start gear to minimise clutch slip when the vehicle is launched from rest.

Abstract: A planet gear carrier for a bicycle hub transmission comprises a first carrier member including a first carrier member axle opening for receiving an axle therethrough. The first carrier member includes plurality of first planet gear openings disposed on a first side of the first carrier member and a plurality of second planet gear openings disposed on a second side of the first carrier member. A separate second carrier member is fastened to the first side of the first carrier member, wherein the second carrier member has a second carrier member axle opening for receiving the axle therethrough. A separate third carrier member is fastened to the second side of the first carrier member, wherein the third carrier member has a third carrier member axle opening for receiving the axle therethrough.

Abstract: A planetary gearset includes a sun gear member having a sun gear body made of a steel material and an outer periphery with a plurality of teeth formed thereon. Each of the sun gear teeth has at least one mating surface for engaging mating surfaces on complementary teeth on at least one planet gear. A fatigue-resistant coating is applied to the mating surfaces of the sun gear teeth. The coating is harder and more abrasive than the mating surfaces of the planet gear teeth.

Abstract: A planetary gearset includes a sun gear member having a sun gear body made of a steel material and an outer periphery with a plurality of teeth formed thereon. Each of the sun gear teeth has at least one mating surface for engaging mating surfaces on complementary teeth on at least one planet gear. A fatigue-resistant coating is applied to the mating surfaces of the sun gear teeth. The coating is harder and more abrasive than the mating surfaces of the planet gear teeth.

Abstract: A differential gear includes a differential housing consisting of cast iron and a differential crown wheel consisting of case hardened steel. The differential gear, while being of reproducible quality, can be produced simply and cost-effectively. The differential housing has, on the circumference onto which the differential crown wheel is pressed, a bearing shoulder, to which the differential crown wheel is fastened via a nickel-containing welded joint. The composition of the welded joint is influenced by the use of a nickel-containing additional material which is added to the welding melt in the form of an annular foil arranged between the bearing shoulder and the differential crown wheel.

Abstract: A differential gear assembly including a differential housing. A pair of side gears substantially axially aligned and spaced apart from each other, wherein the side gears are adapted to be supported by the differential housing and to engage axle shafts. A pair of pinion gears substantially axially aligned and spaced apart from each other, wherein the pinion gears are adapted to engage the side gears. A ring gear is mounted externally to the differential housing and a pinion pin engages and extends diametrically across the ring gear. The ring gear includes features adapted to receive the ends of the pinion pin and to position the pinion pin relative to the ring gear such that a center of mass of the ring gear is aligned with a center of mass of the pinion pin.

Abstract: A sun gear shell assembly includes a cylindrical shell body formed by cold-rolling a low carbon steel, and a neck section having a protruding neck collar, formed by heat drawing and machining a middle carbon steel. A wall thickness of the shell body is increased for added strength. The neck has a 30 degree chamfer to prevent failures at the neck section, and the neck section is then welded to the shell body so that the sun gear shell becomes one piece. A plurality of holes are disposed in the neck section encircling the neck collar. An injection molded plastic washer including a plurality of tabs disposed on one side surface, has the tabs inserted into holes formed in the neck section to form the completed sun gear shell assembly.

Abstract: A low-play planetary gear mechanism for high rotational speeds and low torque transmission and having roller bearings for the parts which rotate within the gear mechanism. The gear mechanism is designed for a long, maintenance-free service life in continuous operation at high drive speeds. To accomplish this, the running surfaces of at least some of the gears are coated with a coating that has a higher wear resistance and a lower coefficient of friction than the respectively associated base material. As such, all of the surfaces of the gear mechanism which come into contact with one another are able to run for long periods at the end of assembly of the gear mechanism. With this gear mechanism, there is no circulating lubricating oil originating from a lubricating-oil collection chamber and which flows freely around any of the moving parts of the gear mechanism.

Abstract: The internal gear is a bottomed cylindrical component, which has the boss portion fitted over the outer circumferential surface of the shaft, the disk-shaped flange portion extending radially outwardly from the boss portion, and the cylindrical gear body having a tooth portion in its inner circumferential surface and connecting integrally to the outer circumferential part of the flange portion. The flange portion is virtually conical on its outer side surface and tapered from the outer diameter side toward the inner diameter side, i.e., from the gear body toward the boss portion. This construction is thicker at the boss portion side than at the gear body side. Further, the density of the flange portion is almost inversely proportional to the thickness and is lower at the boss portion side than at the gear body side. The cylindrical gear body has a density distribution such that the central part of the gear body is lower in density than the end portions in a tooth trace direction of the teeth portions.

Abstract: In a planet gear type torque transmission device, the internal teeth of an internal gear integrally formed by resin molding are arranged regularly for the ribs for coupling the inner periphery and the outer periphery of the gear. Thus, the mold can also be modified regularly so as to form the internal teeth with high accuracy.

Abstract: An inscribed planetary gear device usable as a speed reducer or an overdrive has a primary shaft which serves, for example, as an input shaft, an externally-toothed gear carried at an eccentricity by the primary shaft; an internally-toothed gear inscribed by the externally-toothed gear; and a secondary shaft which serves, for example, as an output shaft and connected to the externally-toothed gear, through an Oldham's ring which transmits to the secondary shaft only the rotation of the externally-toothed gear taking place about the axis of the externally-toothed gear. The externally-toothed gear is provided with a counter flange at an end facing the Oldham's ring and is operatively connected to the Oldham's ring through Oldham's projections and Oldham's grooves receiving Oldham's projections provided on the Oldham's ring and the counter flange, respectively, or vice versa.

Abstract: In an automatic washer drive system, a planetary gear arrangement is provided including an input drive shaft being drivingly connected to a motor at one end and having a sun gear interconnected with a second end. A plurality of cylindrical plastic planet gears are disposed around and engage the sun gear. A plastic unitary carrier member rotatably supports the planet gears and further interconnects with an output drive shaft for causing rotation of an agitator. A gear housing surrounds the cylindrical planetary gears which engage an internal ring gear disposed on an inner peripheral surface of the gear housing. The plastic unitary carrier member is configured to include a plate portion which extends outwardly in the radial direction with respect to the output drive shaft. A plurality of the cylindrical pin portions extend from the plate portion in the longitudinal direction with respect to the output drive shaft. These cylindrical pin portions provide the rotatable support of the cylindrical planet gears.

Abstract: A planet-pinion carrier assembly for a planetary gear system includes a planet-pinion carrier having first and second radially extending sections, planet pinions each rotatably mounted onto a pinion shaft through a bearing, a first thrust washer disposed between one axial end of each planet pinion and the first section, and a second thrust washer disposed between the other axial end of each planet pinion and the second section. The first and second thrust washers each have a surface hardness large enough to ensure an improved durability and reliability.

Abstract: A hollow roller which comprises a hardened outer surface, and a non-hardened inner surface which has not been subjected to carburization process, whereby soft portions remain at the inner surface of the hollow roller in order to prevent the inner surface from being cracked in response to external shock. Preferably, the hollow roller is applied to a planet roller or a cylindrical roller.