Abstract: A planetary roller speed reducer includes a sun roller mounted rotatably on a pedestal and a plurality of planetary rollers having a central portion with a narrowed diameter and mounted rotatably on the pedestal. The sun roller circumscribes large-diameter portions of the planetary rollers which work as a first reduction part, and an outer ring working as an output shaft circumscribes a small-diameter portion working as a second reduction part. A rotary driving system comprises a support fixed to the pedestal and disposed within the outer ring on an extension of the sun roller, and a turning angle detector fixed to the outer ring detects a turning angle between the support and the outer ring.

Abstract: A differential gear that includes a cage in which there is disposed first and second rotatable cylinders positioned adjacent to one another, each rotatable cylinder having an elliptically-shaped groove in its surface and a sphere in each groove in contact with the cage as the cylinders are rotated. The first and second rotatable cylinders are rotatable only in opposite directions.

Abstract: A linear wave gear drive has a car with oppsoite walls on which pluralities of apertures carrying reciprocating roller assemblies are arrayed. The car is located between inwardly-facing cam surfaces on a track and a belt housing outwardly-facing cam surfaces is passed through the car, with the assemblies contacting facing ones of the surfaces to move the car linearly in response to lineal movement through the car of the belt. The assemblies preferably have three rollers contrally mounted in axially-spaced locations for free, independent rotation about common shaft pins. The apertures are shaped to accommodate the pins in orientations perpendicular to the directions of movement of the belt and car, and parallel to the apertured car sides. Upper and lower rollers have identical larger diameters than central rollers to capture the belt edge in order to inhibit axial displacement of the pins. Assemblies are eliminated from a usual "one more" or "one less" wave gear construction to provide a stronger car.

Abstract: A transverse axis infinitely variable transmission of the traction type which uses a planetary reduction principle whereby the highest input/output speed ratio is achieved as the contact radii of the elements approach similarity. All the traction elements of the present invention operate at virtually the same high surface speed whereby the minimum relative tangential force, transmitted through the traction contacts, will generate the maximum torque through the transmission. The present invention includes a spider which rotates with the main shaft about the first axis of the transmission. Compound-plants are rotatably supported by spindles which radiate outwardly from the spider hub. The axis of rotation of the compound-planets is transverse to the first axis, thereby insuring that the maximum number of traction elements of the same approximate size are incorporated into the smallest possible envelope. A first surface of each of the compound-planets is engaged with a non-rotating reaction member.

Abstract: A planetary friction transmission, especially for miniature application as in prosthetic joints and the like, has cylindrical periphery planet wheels pressed by a stationary ring against a conical portion of the drive shaft, the ring being axially shiftable relative to the shaft and on a support. The planet carrier is connected to the planet wheels by pins which extend into the holes of the planet wheels with play.

Abstract: An epicyclic assembly to transmit torque and motion between externally connectable members using cylindrical elements maintained in rolling contact by surrounding rings and helical coils, the latter being in continuous helical paths. The rings and helical coils provide an effectively cylindrical inner surface of a diameter determined by the diameters of the cylindrical elements within it. Axial pressure exerted on the rings is redirected inwardly by angled surfaces of the rings to cause the helical coils to contract radially onto the cylindrical elements.

Abstract: A traction type transmission characterized in that a planetary roller mechanism is constituted by a sun roller, a plurality of planetary rollers disposed equidistantly around the sun roller and an exterior ring disposed outside the planetary rollers, the sun roller is connected to a high speed shaft while either the exterior ring or the planetary shafts of the planetary rollers are connected to a low speed shaft through a rotary member; the planetary rollers are strongly pressed to the outer periphery of the sun roller in the presence of an oil and two slope surfaces of the inner periphery of the exterior ring are strongly pressed to both shoulder portions of the outer periphery of these planetary rollers in the presence of an oil, respectively.

Abstract: A traction drive tool adapter, has a rotary portion provided at its front half section with planetary roller-inserting bores extending radially from the outer circumferential surface of the rotary portion into a central bore therein, each of the roller-inserting bores having planetary rollers driving shaft member-setting grooves continuing from two ends of the roller-inserting bore that are opposed to each other in the axial direction of the central bore.

Abstract: In a traction roller transmission which has disposed in a housing two planetary type transmission structures each having traction rollers disposed between spaced concentric sun rollers and traction rings and supported by support members of which one which is associated with one of the transmission structures carries the sun of the other transmission structure and the other is connected to the transmission output shaft while the input shaft carries the sun of the one transmission structure (the planetary rollers are supported in an inclined position), and the traction rings are axially curved and forced toward one another so as to engage therebetween the planetary rollers which are supported at predetermined angles selected such that their engagement forces with the sun rollers and traction rings correspond to the torque to which they are subjected during operation.

Abstract: A traction drive unit for transmitting rotary motion about an axis of rotation has an inner sun roller, an outer ring and planet rollers arranged in two circular rows between the sun roller and outer ring. The sun roller takes the form of a double cone having outwardly presented raceways which taper downwardly toward each other and thrust ribs that project radially beyond the large ends of the raceways. The outer ring has two inwardly presented tapered raceways which taper downwardly toward the ends of the ring. The inner planet rollers are tapered rollers which are organized in two circular rows along the raceways of the sun member. The outer planet rollers have crowned peripheral surfaces which contact the tapered raceways of the outer ring and the tapered side surfaces of the inner planet rollers. They are captured axially by reason of the taper of the outer raceways and inner planet rollers. The outer rollers revolve in pairs about axles which are fitted to end disks.

Abstract: A speed-up spindle unit including a non-rotative housing having a fixed ring, a sun roller secured to a high speed spindle rotatably carried in the housing and a plurality of planetary rollers rotatably carried in such a manner as to be in contact with the fixed ring at one peripheral end and the sun roller at the opposite peripheral end so that the planetary rollers individually rotate about their own axes while they revolve about the sun roller, thereby transmitting a torque from the planetary rollers to the high speed spindle through the sun roller.

Abstract: A traction drive spindle device includes an input shaft connectable to a drive main shaft for rotation therewith. A hollow holder shaft is connected to an output end of the input shaft in coaxial relation thereto, the hollow holder shaft having a plurality of planetary rollers mounted thereon intermediate opposite ends of the holder shaft. A high-speed spindle is rotatably received in a bore of the hollow holder shaft, the high-speed spindle having an inner end portion which is received in the bore and serves as a sun shaft disposed in rolling contact with the planetary rollers. A housing is mounted on the outer periphery of the holder shaft through a first ball-and-roller bearing so as to be rotatable relative to the holder shaft, the housing having a fixed ring fixed to an inner periphery thereof. The planetary rollers are disposed in rolling contact with the fixed ring. A second ball-and-roller bearing is interposed between the holder shaft and the high-speed spindle.

Abstract: A rotating tool includes a drive source, a work piece, and a traction drive unit intercoupled between the drive source and work piece. The traction drive unit includes a unit case having a through-hole, a drive shaft and a follower shaft inserted into the through-hole and supported via a rolling bearing, and a plurality of planet rollers installed between the rolling bearing and the drive shaft in a frictionally rotatable condition and supported at the side of the follower shaft.

Abstract: A linear axis (cantilevered beam) is longitudinally displaceable relative to its support which, in turn, is displaceable laterally along an overhead frame so as to provide X-Y positioning for pick and place spindles and similar tools which are attached to the beam. A particular structural combination for accomplishing this involves a low inertia servomotor driving a speed reducer which, in turn, directly drives a short endless timing belt which, in turn, intermeshes with and drives a toothed rack in order to provide reliable, with zero backlash, high accuracy X-Y positioning of the tools. Features of the structural arrangement allow the use of component parts requiring much less precision, and thus much less cost, of manufacture than prior art, zero backlash, linear axis positioning systems.

Abstract: A planetary speed reducer includes a drive roller having a drive surface, a stator having a concentric drive surface, the respective drive surfaces defining an annular space therebetween. A plurality of rotatable planet rollers have peripheral portion in frictional driving connection with the said drive surfaces of the roller and stator. An output shaft is connected to an assembly which carries the planet rollers.

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.

Abstract: An electric motor having a frictional planetary speed reducer comprises a hollow cylindrical rotor disposed inside a stator. The speed reducer is at least partly accommodated in the rotor.