Abstract: A speed-reducing or -increasing apparatus, with first and second crown gears facing one another, with a cam unit that causes the first crown gear to incline with respect to the second crown gear so that the first crown gear meshes with the second crown gear, that causes the first crown gear to precess in such a manner as to move the meshing position, and couples to an input or output shaft. A rolling element is between the cam unit and the first crown gear, and the cam unit includes a first member that couples to the input or output shaft and a second member made of steel and including a rolling element rolling portion where the rolling element rolls, the second member configured to be incapable of rotating relatively to the first member, and at least part of the first member having a lower specific gravity than the second member.

Abstract: A game controller for controlling electronic games includes a controller chassis and an actuator system including: an actuator body pivotally mounted to the controller chassis; a strike plate coupled to the actuator body; a trigger adjustment system having an arm; and an actuator adjustment control screw received in a screw thread disposed within said arm. A portion of the actuator adjustment control screw may engage with a portion of the strike plate and the portion of the actuator adjustment control screw creates an end stop to limit movement of the actuator body.

Abstract: Gear mechanism (1), in particular coaxial gear mechanism, having an internal gear (3) with an inwardly directed toothing (5), a tooth carrier (11) which is arranged coaxially with respect to the internal gear and in which a multiplicity of teeth (7) for engaging with the toothing (5) are accommodated, wherein the teeth (7) are mounted radially displaceably in the tooth carrier (11), a drive element with a profiling (22) for radially driving the radially displaceably mounted teeth (7), wherein the profiling (22) has, over its circumference, at least two elevations, wherein the gear mechanism is constructed such that there is a positive transmission ratio between a drive via the drive element and an output via the tooth carrier (11).

Abstract: A roll-and-press friction-driving harmonic drive gear reducer includes: a wave generator having an elliptical external contour; a flexible spline having an output end and an open annular wall connected to the output end, the open annular wall having an external circumferential surface that includes an external roll-and-press area in an annular form, the external roll-and-press area including an annular section of external teeth adjacent to an end edge and a circumferential external curved surface adjacent to the annular external teeth; and a circular spline, which has an end that is recessed to form an accommodation hole that is inwardly extended, the accommodation hole having an internal circumferential surface that includes an internal roll-and-press area, the internal roll-and-press area including an annular section of internal teeth adjacent to an end edge and a circumferential internal curved surface adjacent to the set of internal teeth.

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: A harmonic drive apparatus (also known as a strain wave gear) is constructed with a circular, flexible spline disc having a generally flat configuration or a slightly conical configuration.

Abstract: An output portion is formed integrally with an output gear made of a magnetic material and is rotated integrally with the output gear. A yoke is placed at the output gear and includes first and second yokes. An arcuate gap, which extends along an arc that is centered at a rotational center of the output gear, is formed between the first yoke and the second yoke. A magnet is installed between one end of the first yoke and one end of the second yoke. Another magnet is installed between another end of the first yoke and another end of the second yoke. A Hall IC is placed in the arcuate gap and is movable relative to the yoke. Primary holes are formed between the rotational center and the yoke such that the primary holes extend through the output gear in a plate thickness direction of the output gear.

Abstract: A cycloidal differential includes a driven body and a coupling ring supported for rotation within the driven body. The coupling ring defines a first eccentric race and a second eccentric race on opposing sides of the coupling ring. The cycloidal differential further includes first and second cycloidal drives. The first cycloidal drive includes a first roller disk received in the first eccentric race and a first output member operably coupled to the first roller disk and configured to couple with a half shaft. The second cycloidal drive includes a second roller disk received in the second eccentric race and a second output member operably coupled to the second roller disk and configured to couple with another half shaft.

Abstract: A speed reducer (20) of a reduction motor (1) includes a first internal gear (22) attached to the housing, an input shaft (21) having an eccentric shaft portion (21d), a first external gear (24) having a pitch circle diameter smaller than a pitch circle diameter of the first internal gear (22), and an output member (27) connected to the first external gear (24). The input shaft (21) is configured to be rotated by a rotation input from the electric motor (10). The first external gear (24) is configured to be placed inside of the first internal gear (22) under a state that a part of an external teeth (24a) of the first external gear (24) engages with an internal teeth (22d) of the first internal gear (24a). A holding member (28) fixes the first internal gear (22) in the axial direction of the input shaft (21).

Abstract: A gear mechanism, including: a first gear; and a second gear. The first gear and the second gear are arranged at an inclination angle to form a first meshing region and a second meshing region. Multiple tooth tip portions of the first gear and multiple tooth tip portions of the second gear are each formed to be held in contact with each other at one point in the first meshing region. Multiple recessed portions of the first gear and multiple recessed portions of the second gear are each formed to conform to a passing region extending along movement of one of the multiple mating tooth tip portions at the time of moving in the second meshing region.

Abstract: A first internal gear of a speed reducer includes an internally-toothed portion and a bearing portion and is formed as a one-piece member that is formed separately from a first housing. The internally-toothed portion forms internal teeth, which are meshed with external teeth of a first planetary gear. The bearing portion includes an eleventh cylindrical surface, which supports a motor shaft. The internal teeth of the first internal gear are arranged coaxial with the eleventh cylindrical surface. The internal teeth of the first internal gear and the bearing portion are formed as portions of the one-piece member.

Abstract: A gear device includes an eccentric cam rotatably formed and including a support portion arranged eccentrically relative to a rotational axis center of the eccentric cam, an internally toothed gear provided coaxially to the eccentric cam, an externally toothed gear supported by the support portion and engaged with the internally toothed gear, an output portion integrally coaxially rotating with the externally toothed gear, and a bearing portion supporting the output portion in a state where an axis line of the output portion and the externally toothed gear slants relative to the rotational axis center of the eccentric cam in a manner crossing the rotational axis center. Each of the internally toothed gear and the externally toothed gear includes a bevel gear portion which is formed by forming gear teeth on a circular cone whose apex overlaps with an intersection point of the axis line and the rotational axis center.

Abstract: A method of rotating an output gear at a rotational rate that is slower than an input rotational rate. The input rotation moves a planetary gear in a circular motion about a central axis. A first stage external gear configuration of the planetary gear engages with an internal gear configuration of a stationary gear. The engagement rotates the planetary gear about a concentrically located planetary gear rotational axis. A second stage external gear configuration is rotated by and at a same rate the first stage external gear configuration. The first stage diameter and/or number of teeth differs from the second stage diameter and/or number of teeth. The planetary gear rotation in conjunction with the difference between the first and second stages causes the output gear to rotate respective to the stationary gear. Rotational positioning of the output gear can be monitoring and adjusted by controlling the input rotational rate.

Abstract: The invention relates to a hydraulic oil-driven structural support rotating mechanism comprising at least two hydraulic cylinders for driving the rotational movement of the structural support with respect to at least one axis, selected from vertical, horizontal or a combination of both, and a hollow core, comprising at least one opening on its side surface for the passage of a first and a second pivotable hydraulic cylinder, fixed to the core by means of two parallel vertical shafts, the ends of each hydraulic oil cylinder being fixed by attachment means to a rotating mechanical element selected from a slew ring or bearing, located inside the hollow core to which it is fixed by rotating mechanical element-core attachment means, and attached to the structural support by structural support-rotating mechanical element attachment means.

Abstract: In an electric linear motion actuator for transmitting torque of a rotary shaft (4) to planetary rollers (7) and thus to a linearly driven output member constituted by an outer race member (5), axial movement of a carrier (6) supporting the planetary rollers (7) is restricted, and the outer race member (5) is axially slidably fitted in a radially inner surface of a cylindrical portion (1a) of a housing (1) and is rotationally fixedly coupled to an object to be driven via keys (25) The planetary rollers (7) have their radially inner surfaces rotatably supported, on respective support pins (6c) of the carrier (6), and are radially inwardly biased by radial compression ring springs (21) wound around the support pins (6c) so as to envelop the support pins. The planetary rollers (7) are thus pressed against the radially outer surface of the rotary shaft (4).

Abstract: A wobble mechanism, in particular for a two-part adjustment fitting of a vehicle seat, is provided with a flat housing with internal toothing and with an oscillating wheel with external toothing, which is arranged within the housing and is eccentrically rotatable around a center axis of the housing. The external toothing of the oscillating wheel engages with the internal toothing of the housing. The housing is divided into at least two housing parts along a dividing plane.

Abstract: In a planetary gear device, a first side plate as carrier is formed to a disc plate shape and secures thereto pins to protrude the pins from one end surface in an axial direction. The outside diameter of the first side plate is formed to be a small diameter on one side in the axial direction and a large diameter on the other side in the axial direction. The first side plate is provided with press-fitting hole portions with the pins press-fitted thereinto and small-diameter side concavities that are formed on the press-fitting hole portions on one side in the axial direction, that open to one end surface in the axial direction of the first side plate and that have internal surfaces being out of contact with the pins at at least parts thereof.

Abstract: A speed change gear includes: an internal gear member; an eccentric member; an oscillating member; a pair of first and second rotating members; and a pin that is supported at both ends by insertion holes of the first and second rotating members. The insertion hole and the insertion hole have the same diameter. The outside diameter of the other side end portion of the pin is smaller than the outside diameter of one side end portion of the pin such that the one side end portion is press-fitted in the corresponding insertion hole and the other side end portion is supported by the corresponding insertion hole.

Abstract: A planetary gear mechanism of the invention includes a housing, an input shaft that has an eccentric portion whose center lies on an eccentric axis, and is rotatable about the axis of input and output shafts relative to the housing, an oscillating face plate that eccentrically oscillates relative to the input shaft via the eccentric portion, and rotates about the eccentric axis, and an output shaft that is provided with a second internally toothed gear that internally contacts and meshes with a second externally toothed gear formed on the oscillating face plate, and is rotatable about the axis of the input and output shafts relative to the housing. The housing is formed with a first internally toothed gear that internally contacts and meshes with a first externally toothed gear formed on the oscillating face plate.

Abstract: A kinematism is described with orbital movement with fixed orientation comprising at least one first and one second motion transmitting means, respectively connected to a thrust system and to a driven system, mutually facing and mutually frontally cooperating through respectively a first and a second mechanically cooperating means, at least the first transmitting means rotating around a main rotation axis, the first mechanically cooperating means being adapted to apply a series of points of force to the second mechanically cooperating means so that a set of positions, instant by instant occupied in the space by each one of such points of force, individually considered, substantially describes a Lemniscate curve as Mobius ring, the thrust system being slanted with respect to the main rotation axis and symmetrical and coaxial with a slanted axis around which the curves of such points of force are symmetrically distributed, further comprising rotation-preventing means.

Abstract: A transmission ratio variable mechanism includes an input member and an output member arranged to rotate around a first axis, an intermediate member arranged to connect the input member and the output member so as to be differentially rotatable, and a motor arranged to drive the intermediate member. The motor includes a cylindrical rotor arranged to rotate around the first axis. An inner periphery of the rotor is arranged to support the intermediate member and arranged to rotatably support the input member and the output member via bearings, respectively.

Abstract: In one embodiment, a transmission includes: a wobbler having an outer periphery tiltable with respect to a wobble axis of rotation; a set of freewheeling gears disposed in a fixed relationship with respect to one another, each gear having a gear axis of rotation about which the gear may rotate different from the gear axis of rotation of each of the other gears; one or both of the wobbler and the set of gears rotatable with respect to one another about the wobble axis of rotation; and each gear operatively connected to the wobbler simultaneously with the other gears at a place on the periphery of the wobbler different from the place at which each of the other gears is operatively connected to the wobbler such that each gear rotates on its axis of rotation as the wobbler wobbles or as the wobbler induces a wobble in another part.

Abstract: The invention relates to an actuator (10) for units comprising a planetary gear (14), especially a planetary differential gear, whose radially inward region is embodied as a hollow shaft and which is equipped with a drive unit and a driven shaft that cooperates with the unit to be operated. A drive shaft of the planetary gear (14) is connected to the drive unit and can be driven by the same. Said drive shaft is configured as a first hollow shaft (16) while the driven shaft is embodied as a second hollow shaft (40). A planet carrier (28) is provided that is connected to the first hollow shaft (16) or is embodied with the radially inward region thereof as a first hollow shaft (16) in such a way that a rotary movement is also performed by the planet carrier (28) when the first hollow shaft (16) rotates while the drive unit as well as the first (16) and the second hollow shaft (40) encompass a common axis of rotation.

Abstract: A transmission ratio variable mechanism includes an input member and an output member, which are rotatable around a first axis, an inner ring arranged to connect the input and output members to each other so as to be differentially rotatable, an outer ring, and a motor. A second axis serving as a center axis of the inner ring and the outer ring is inclined to the first axis. The transmission ratio variable mechanism includes uneven engagement sections including a projection provided on one of each of end surfaces of the inner ring and a power transmission surface corresponding to the end surface, and a recess. The inner ring includes a first member forming the first end surface and a second member forming the second end surface. The first and second members are formed separately from each other and coupled to each other so as to be movable together.

Abstract: A reduction gear capable of satisfying, at high level, each of: realizing a high reduction ratio; preventing backlash by securing rotation smoothness; and carrying out compactification and weight saving of entire mechanism is provided. The reduction gear of the invention is a modified crown reduction gear, comprising: a pressing mechanism 16 operated to rotate; a fixed crown gear 2 fixed to an external member 15; a movable crown gear 1, wherein the difference in the number of teeth between the gears is one; and an output axis 3 flexibly attached to the gear 1. The gear 1 engages with the gear 2 at a slant by pressing-force provided from the mechanism 16. In this instance, contact locations of teeth of the gears 1 and 2 are dispersed at two places existing at both sides between which a gradient center line intervenes.

Abstract: Actuator adapted to cooperate with a drive of an endothermic engine including power source and a releasable accessory, the actuator including a box-shaped casing, a motorized eccentric group housed inside the casing and including a reduction gearing, an arm cooperating with the eccentric group and supporting a friction wheel adapted to cooperate with the accessory and with the power source, the arm being mobile between an engaged position and a disengaged position of the accessory.

Abstract: An oscillating gear device includes an axially fixed gear piece rotatable around a first axis and an axially oscillating gear piece that oscillates while being inclined with respect to the first axis. A plurality of pins held by one of the gear pieces engage with a plurality of tooth grooves of the other gear piece in engagement regions at a predetermined length in longitudinal directions of the pins. A formula rC0/rF0=ZC/ZF is satisfied, where rC0 is a distance between an arbitrary point on the central axis of the pin in a corresponding section corresponding to the engagement regions of the pin as viewed in the radial direction of the pin and the first axis, rF0 is a distance between the arbitrary point and the second axis, ZC is the number of pins of the one gear piece, and ZF is the number of tooth grooves of the other gear piece.

Abstract: A speed reducer capable of shortening a length in an axial direction of a turning structure by arranging a plurality of small-sized motors is provided. The hollow speed reducer 10 is a planetary gear apparatus having a crankshaft 11, a pinion 12 formed with outer teeth at an outer periphery thereof, fitted to a crank portion of the crank shaft 11 and eccentrically moved, and a case 13 an inner peripheral face of which is formed with inner teeth brought in mesh with the outer teeth of the pinion 12, in which an inner portion of the hollow speed reducer 10 is formed with a hollow hole, a center gear for an input of the hollow speed reducer 10 is provided at a position of the hollow hole, and small gears provided at output shafts of a plurality of motors 15 are simultaneously brought in mesh with the center gear.

Abstract: A parallel eccentric electro-mechanical actuator provides motive power and includes an electric prime mover that drives the reducer's pinion gear. This pinion drives minimum three star gears with stationary shaft bearings. Each shaft contains an eccentric which are completely in parallel with each other. These eccentrics can be thought of as parallel/in-phase driven crankshafts. Each eccentric drives the parallel eccentric (PE) gear through a bearing. The PE gear exhibits a circular motion (without rotation) which in itself is unbalanced. The crankshafts have another eccentric which create an opposite inertia force to balance that of the PE gear. The PE gear contains an external toothed gear on its periphery. It meshes with the internal teeth of the output ring gear. The relative motion between the PE gear and the ring gear is that the PE gear rolls inside the ring gear. This relative motion is called hypo-cycloidal motion.

Abstract: A wobble mechanism is provided with a wobble member, which is arranged on an input shaft and has at least one row of force transmitting elements interacting with secondary force transmitting elements arranged on the input side and output side. At least one row of force transmitting elements is formed by magnets (7, 8, 37, 38, 48, 49, 50) arranged on the outside of the wobble member. In this way, low-noise operation is enabled.

Abstract: In a drive device for a vehicle seat (1), having a frame (10) which belongs to the vehicle seat (1), an output (14a, 14b) which belongs to the vehicle seat (1), is hinged to the frame (10) and is pivotable relative to the latter about an axis (A), and a geared fitting (16), the two fitting parts (16a, 16b) of which perform a relative rotational movement with superposed tumbling movement in a drive situation. One fitting part (16a) acts on the output (14a, 14b) and the other fitting part (16b) is supported on the frame (10). A transmission element (25, 35, 37) is provided between the fitting part (16a) which acts on the output (14a, 14b) and the output (14a, 14b). The transmission element (25, 35, 37) is torsionally rigid in the circumferential direction of the axis (A) and simultaneously flexible in the radial direction of the axis (A).

Abstract: The power transmission device has an internally meshing planetary gear mechanism that has an input shaft, an eccentric body provided on the input shaft, an externally toothed gear eccentrically oscillating via the eccentric body, and an internally toothed gear with which the externally toothed gear internally meshes. The externally toothed gear is assembled to the internally toothed gear in an interference fit.

Abstract: In one embodiment, a transmission includes: a wobbler having an outer periphery tiltable with respect to a wobble axis of rotation; a set of freewheeling gears disposed in a fixed relationship with respect to one another, each gear having a gear axis of rotation about which the gear may rotate different from the gear axis of rotation of each of the other gears; one or both of the wobbler and the set of gears rotatable with respect to one another about the wobble axis of rotation; and each gear operatively connected to the wobbler simultaneously with the other gears at a place on the periphery of the wobbler different from the place at which each of the other gears is operatively connected to the wobbler such that each gear rotates on its axis of rotation as the wobbler wobbles or as the wobbler induces a wobble in another part.

Abstract: An oscillating internally meshing planetary gear system is provided in order to improve basic performance and reduce cost at the same time. The oscillating internally meshing planetary gear system has an internal gear and external gears internally meshing with the internal gear and is configured such that one of the external gears and the internal gear is oscillatingly rotated by means of eccentric bodies formed in an input shaft (eccentric body shaft). The system includes: a sliding motion-facilitating member intervening between an outer periphery of the eccentric body and the oscillating gear; and an eccentric body shaft bearing supporting the eccentric body shaft. In addition to this, the eccentric body shaft bearing and the sliding motion-facilitating member have the same configuration.

Abstract: An oscillating gear device includes an axially fixed gear piece rotatable around a first axis and an axially oscillating gear piece that oscillates while being inclined with respect to the first axis. A plurality of pins held by one of the gear pieces engage with a plurality of tooth grooves of the other gear piece in engagement regions at a predetermined length in longitudinal directions of the pins. A formula rC0/rF0=ZC/ZF is satisfied, where rC0 is a distance between an arbitrary point on the central axis of the pin in a corresponding section corresponding to the engagement regions of the pin as viewed in the radial direction of the pin and the first axis, rF0 is a distance between the arbitrary point and the second axis, ZC is the number of pins of the one gear piece, and ZF is the number of tooth grooves of the other gear piece.

Abstract: A wobble mechanism, in particular for a two-part adjustment fitting of a vehicle seat, is provided with a flat housing with internal toothing and with an oscillating wheel with external toothing, which is arranged within the housing and is eccentrically rotatable around a center axis of the housing. The external toothing of the oscillating wheel engages with the internal toothing of the housing. The housing is divided into at least two housing parts along a dividing plane.

Abstract: A speed reducer 32 has an eccentric rotating member 56 which rotates along with a motor shaft 55 of an electric motor 11, an outer gear 57 which is rotatably supported by the outer circumference of the eccentric rotating member 56, an inner gear 58 which is fixedly disposed so as to be coaxial with the motor shaft 55 so as to engage with the outer gear 57, an output member 59 which is connected to an input member 37 of the motion converting mechanism 22 disposed so as to be coaxial with the motor shaft 55 so as to be not relatively rotatable about the input member 37, and an Oldham mechanism 60 which is disposed between the outer gear 57 and the output member 59 so as to transmit only a rotational component of the outer gear 57.

Abstract: A method for providing a compact rotary action torque within a larger system comprising a cross-roller bearing, generating a controllable electromagnetic field using a motor stator while interfacing the cross-roller bearing using a bull gear. The bull gear interfaces the cross-roller bearing and includes gear-teeth. An output plate includes a ring gear and supports shaft bearings. The ring gear interfaces the output plate and includes gear-teeth. A drive shaft holds a prime mover rotor and an eccentric and associates with the output plate via the shaft bearings. A gear train includes a meshing gear having gear-teeth for meshing with the gear-teeth of the bull gear and the gear-teeth of the ring gear and walks a minimal number of the gear-teeth for each rotation of the prime mover rotor; thereby, providing a transmitting force from the prime mover along the shortest-possible transmission path.

Abstract: A speed reducer has a crankshaft to be rotated in conjunction with a drive unit. First through third eccentric portions are provided on the crankshaft. First through third externally-toothed gears are adapted to be moved respectively in conjunction with the first through third eccentric portions. Pin teeth are disposed along an inner periphery of a case to allow each of the first, second and third externally-toothed gears to be in meshing engagement therewith. An output shaft unit is adapted to be rotated in conjunction with the first, second and third externally-toothed gears. The first, second and third eccentric portions are arranged with a given phase difference in a rotation direction of the crankshaft with respect to each other. Each of the first, second and third externally-toothed gears is in meshing engagement with less than half of the plurality of pin teeth.

Abstract: There is provided an eccentric oscillating gear mechanism including an internal gear, an external gear meshing with the internal gear, a crankshaft for moving the external gear eccentrically, and a carrier for supporting rotatably the crankshaft, the internal gear and the carrier being made to rotate relatively, wherein a cylindrical tube body, which penetrates the eccentric oscillating gear mechanism in an axial direction, is supported rotatably on the carrier.

Abstract: A method for providing a compact rotary action torque within a larger system comprising a cross-roller bearing, generating a controllable electromagnetic field using a motor stator while interfacing the cross-roller bearing using a bull gear. The bull gear interfaces the cross-roller bearing and includes gear-teeth. An output plate includes a ring gear and supports shaft bearings. The ring gear interfaces the output plate and includes gear-teeth. A drive shaft holds a prime mover rotor and an eccentric and associates with the output plate via the shaft bearings. A gear train includes a meshing gear having gear-teeth for meshing with the gear-teeth of the bull gear and the gear-teeth of the ring gear and walks a minimal number of the gear-teeth for each rotation of the prime mover rotor; thereby, providing a transmitting force from the prime mover along the shortest-possible transmission path.

Abstract: In the case of a gear stage (1) of an actuating drive, in particular for a vehicle seat, having a bearing (12) which defines an axis (A12) and having an oscillatory body (11) which is mounted in a rotatable manner by the bearing (12), defines a further axis (A11) and, upon rotation of a driving mechanism (21), executes a rolling movement on the bearing (12), the axis (A11) of the oscillatory body (11) is inclined obliquely at an angle (?) relative to the axis (A12) of the bearing (12).

Abstract: Self-contained rotary actuator provides motive power in automated mechanical systems and includes cross-roller bearing as a structural joint. Outer attachment shell rigidly interfaces the mechanical system and contains motor stator and internal bull gear. Internal bull gear, with internal gear teeth, interfaces cross-roller bearing, and provides stiffness. Output attachment plate mechanism includes internal ring gear and supports drive shaft bearings. Internal ring gear, with internal gear teeth, rigidly interfaces output attachment plate. Drive shaft holds prime mover rotor and eccentric and associates output attachment plate via the drive shaft bearings. Gear train includes circular arc, external teeth meshing gear for meshing with internal teeth of internal bull and internal ring gears and walks minimal external gear teeth per prime mover rotor rotation.

Abstract: A variable-ratio transmission device for use in connection with a machine, such as a vehicle, comprising a stepless speed change gear with a continuously variable-ratio over an extremely wide range of speeds.

Abstract: It is an object to obtain a power transmission device capable of allowing conflicting needs to coexist rationally and effectively in accordance with a driving situation. As powertransmitting mechanisms of a power transmission device, there are provided a plurality of characteristically-differentiated internally meshing planetary gear mechanisms, each having an external gear and an internal gear having external teeth and internal teeth the difference in the number of teeth between which is slight. In this structure, at least two of the internally meshing planetary gear mechanisms are disposed in parallel on a path of power transmission, and power transmission characteristics of the two mechanisms are designed to differ from each other.

Abstract: A rotary actuator incorporating a shell, an output plate and a cross-roller bearing retaining the output plate within the shell. A prime mover, disposed within the shell, exerts torque on a gear train within the shell. A pair of gears, disposed on either side of the cross-roller bearing, mesh with one or more gears in the geartrain. Depending on the application, the geartrain may be a planetary epicyclic or an eccentric hypocyclic type.

Abstract: An internal teeth oscillating inner gearing planetary gear system is provided with an input shaft, an eccentric gear rotated by the input shaft, the internal oscillating body oscillatingly rotated through the inner circumferential surface of the eccentric gear, and an external gear meshed with the internal oscillating body.

Abstract: This invention relates to internal combustion engines with cylinders arranged parallel to the main shaft and where reciprocating movements of the pistons are converted to rotation by means of a Z-crank mechanism and motion converter, or conversely to systems such as pumps and compressors wherein rotation of the Z-crank and motion converter produces reciprocating motions of the pistons. The motion converter is prevented from rotation by a reaction control shaft or by a gear train. Connecting rods are prevented from rotating about their long axes. Double-ended configurations can be either opposed cylinder or opposed piston, and may include multiple pairs of pistons with each pair in a common cylinder. The Z-crank may be moved axially for the purpose of varying the compression ratio. Variation of the compression ratio is controlled by an engine control unit and is adjusted to optimize engine performance under varying loads and other conditions.

Abstract: An oscillating inner gearing planetary gear system is provided which does not need to occupy a large space even in a state where a driving source is joined. In particular, the axial length thereof can be shortened, and a large diameter hollow shaft therethrough can be formed. The oscillating inner gearing planetary gear system (100) is configured in such a manner that rotation of an input shaft (104) is reduced by internal oscillating bodies (116A,116B) oscillatingly rotating relative to an external gear (118), and the reduced output is delivered by the external gear (118) also serving as an output shaft. A middle shaft (108) is located parallel to the external gear (118) at a position more radially outward than the internal oscillating bodies (116A,116B). An orthogonal gearset (106) connects the middle shaft (108) and the input shaft (104) at a right angle.

Abstract: In the oscillating internal-meshing planetary gear system of the present invention, a space formed between a external gear (52) and a internal gear (8) is filled up with a grease (14), which contains base oil whose kinetic viscosity is equal to or higher than 10 mm2/s at 100° C. and lithium complex thickener synthesized from adipic acid. Such construction of the oscillating internal-meshing planetary gear system of the present invention provides a power transmission system using a trochoidal tooth profile gear and a circular-arc tooth profile gear that enables to realize a long life and keeping a high efficiency, even without applying grease containing sodium nitrite.