Abstract: A piston includes a piston cap and a piston rod with the piston cap being removable from the piston rod body. The piston cap includes a cap body and a socket extending into the cap body. A mounting portion of the piston rod body extends into the socket of the cap body to connect the piston rod body to the piston cap. A wear sleeve is mounted on the piston rod.

Abstract: A rotary actuator is used in a shift-by-wire system for a vehicle. A speed reducer includes a ring gear and a sun gear and reduces a rotational speed of the motor. An output shaft outputs rotation of the motor at a reduced rotational speed by the speed reducer. A regulating pin is disposed in a fixing member and allows the sun gear to revolve around a rotational axis of the motor and to rotate about an eccentric axis. The regulating pin is a separate member from the fixing member. The regulating pin has a strength equal to or greater than a maximum torque reaction force received from the sun gear. A first difference in hardness between an engaging portion and the sun gear is set to be less than a second difference in hardness between the fixing member and the sun gear.

Abstract: A gearbox assembly for a turbine engine. The turbine engine includes a drive shaft and a fan shaft. The gearbox assembly includes a first gear, a second gear, an output, and a journal pin. The first gear is connected to the drive shaft. The second gear is supported by a planet carrier. The output is connected to the fan shaft. Torque is transferred from the drive shaft of the core turbine engine to the fan shaft through the gearbox assembly. The journal pin is inserted into the planet carrier. The second gear rotates about the journal pin. A coupling of the journal pin and the planet carrier is characterized by an interference ratio greater than a minimum interference ratio of 1.0e-5.

Abstract: A speed reducer includes a helical gear, an eccentric shaft and a slider plate. The speed reducer also includes a transmission gear and an output gear body. The transmission gear is supported at a first support part, transmission gear spinning is restricted by engagement with the slider plate, and the transmission gear revolves by the helical gear rotating with the eccentric shaft. The output gear body rotates by the transmission gear revolving. The transmission gear includes a pair of restricting protrusions protruding toward the slider plate side. The restricting protrusions have engaging surfaces that touch the slider plate wherein the engaging surfaces oppose the slider plate in a radial direction of the transmission gear. Surfaces at opposite sides of the restricting protrusions from the slider plate are formed, as seen in the axis direction of the transmission gear, to be convex to the opposite sides thereof from the slider plate.

Abstract: An electromagnetic actuator includes an electromagnetic coil, a yoke serving as a magnetic path of a magnetic flux of the electromagnetic coil, an armature configured to move in an axial direction while being attracted by the yoke by energization of the electromagnetic coil, and a housing that houses the armature. The armature and the housing are coupled to each other by an engagement structure in which protrusions provided on one of the members engage with engagement grooves formed in the other one of the members. At least a part of the engagement groove is inclined with respect to the axial direction. When the armature moves while being attracted by the yoke, the protrusions of the armature slide along the engagement grooves of the housing, and the armature turns relative to the housing along the inclination of the engagement grooves.

Abstract: A rotary actuator (101) is provided which includes first and second opposing endplates (107); a stator (105) having a first end which is attached to said first endplate, and a second end which is attached to said second endplate; a rotor (103) having first and second eccentrics (125) on a surface thereof; an output attachment ring gear (135) disposed about the periphery of said first and second opposing endplates; a first parallel eccentric gear (131) which is disposed between said first eccentric and said output gear and which meshes with said output gear; a second parallel eccentric gear which is disposed between said second eccentric and said output gear and which meshes with said output gear; a first crosslink (113) which engages said first endplate and said first eccentric gear by way of a first set of surface features (143, 153); and a second crosslink which meshes with said second endplate and said second eccentric gear by way of a second set of surface features.

Abstract: Provided is a plunger pump where quietness can be ensured. A plunger pump includes a cylinder, a piston, a discharge valve, and a plug member. The plug member includes: a recessed portion formed on a circumferential wall of a discharge chamber opposing an outer periphery of the discharge valve in a radial direction; and a discharge passage disposed at a position different from the recessed portion, formed on the circumferential wall of the discharge chamber opposing the outer periphery of the discharge valve in the radial direction, and connecting the discharge chamber and the outside with each other.

Abstract: A rotary actuator is provided which includes an internal gear, first and second parallel eccentric gears which mesh with said internal gear, a crankshaft equipped with first and second eccentrics which are 180° out-of-phase and which drive said first and second parallel eccentric gears, respectively, a prime mover which drives said crankshaft, first and second crosslinks which prevent the rotation of said first and second parallel eccentric gears, respectively, and first and second sets of splines which engage said first and second parallel eccentric gears, respectively.

Abstract: To provide an inexpensive and thin motor with a speed reducer capable of elongating lifetime of bearings by reducing the effect of internal moments acting on an output member without using expensive bearings. A motor with a speed reducer performing output with a gear mechanism rotating to reduce speed around an electric motor M and an eccentric shaft driven to rotate by the electric motor M, in which a plurality of external gears are respectively assembled to the eccentric shaft at positions where moments obtained by multiplying distances in an axial direction from a position of a bearing provided in a speed reducer housing by magnitudes of loads acting on output pins at the positions are cancelled out with each other.

Abstract: A gear device is provided with a carrier having a first member and a second member opposed to the first member in a rotation axis direction, a crankshaft configured to cause the carrier to rotate relative to an outer cylinder about a rotation axis, an insertion pin inserted into the first member and the second member, and a restriction member configured to restrict movement of the insertion pin. The insertion pin is housed in such a manner as to extend from a first hole over to a second hole, the first hole formed in the first member so as to extend through the first member, the second hole formed in the second member so as to correspond to the first hole. At least one of the first hole and the second hole has such a shape as to restrict movement of the insertion pin toward the second hole in the rotation axis direction. The restriction member is mounted in the first member so as to restrict movement of the insertion pin toward the first hole in the rotation axis direction.

Abstract: An actuator device for automatically activating the vehicle door of a motor vehicle, in particular the tailgate, includes an electromotive drive and a radially extending arm. The radially extending arm is attached either to the vehicle door or to a vehicle bodywork and is set in motion by the electromotive drive. The electromotive drive has an electrical motor and a gearbox driven by the motor. The gearbox has a wobble mechanism.

Abstract: A gear train including a rotatable drive shaft and a clutch roller in rotatable contact with the drive shaft or mounted on the drive shaft. A first wobble gear and a second wobble gear are suspended around the drive shaft, wherein the first wobble gear is affixed to and concentric with the second wobble gear and the clutch roller is preloaded against the first and second wobble gears. A first ring gear surrounding and engaged by the first wobble gear; and a second ring gear surrounding and engaged by the second wobble gear. The ring gears being coaxial and rotatable relative to one another. The drive shaft rotates the clutch roller, which drives the first and second wobble gears, such that the wobble gears rotate around the drive shaft and at least one of the first and second ring gears rotate around the common axis.

Abstract: The invention relates to a cycloidal planetary gear speed reducer having a central shaft, comprising at least one ring gear disposed so as to be rigidly mounted in a housing, a set of planet gears in mesh with the ring gear, a rotatably supported planet gear carrier, on which the planet gears are mounted, and a plurality of drive plates arranged axially one behind the other in order to drive the planet gears, wherein the drive plates are mounted eccentrically on the central shaft in order to execute a circular translation movement, wherein at any given time during execution of a circular translation movement, the drive plates are in engagement with at least two planet gears.

Abstract: In a rotation apparatus including a motor and a speed reducer, the speed reducer includes a casing, an internal gear integrated with the casing, a planetary gear internally engaged with the internal gear, and a carrier body arranged in an axial side portion of the planetary gear, the motor and the speed reducer are connected with each other via an adapter, the adapter includes a motor-fixed surface fixed to the motor, a carrier-fixed surface fixed to the carrier body, and an externally fixed surface that is not parallel with the carrier-fixed surface and is fixed to an external member, a driven member is connected to the casing, the driven member, the speed reducer, and the externally fixed surface are overlapped with each other when viewed from a radial direction, and the driven member is rotated within a range of 180 degrees.

Abstract: An apparatus for selectively activating a window treatment includes an input member, such as a pulley activated by a bead chain, an output member such as a sleeve activating a mandrel, a stationary guard for mounting the window treatment and a rotor. The rotor, pulley, and stationary base are coupled to form a cycloid drive, wherein rotation of the pulley causes the rotor to precess with respect to the pulley.

Abstract: When an outer ring is fitted to an inner periphery of an input member, which defines a center hole, and an inner ring is fitted to an eccentric portion with clearances in a reduction-transmission mechanism, in a state where tooth tips of the input member contact bottomlands of a rotation force applying member on a line perpendicular to a second axis and a fourth axis, a size between the second axis and a third axis is set to a size that is smaller than or equal to half of a size obtained by adding a diameter difference between an outside diameter of a ball bearing and an inside diameter of the input member, which defines the center hole, a diameter difference between an inside diameter of the ball bearing and an outside diameter of the eccentric portion and an operating clearance of the ball bearing.

Abstract: A two-stage differential cycloidal speed reducer with a high reduction ratio is provided, including: a plurality of supporting crank shafts; an input shaft including a first crank shaft portion and a second crank shaft portion; a first cycloidal gear provided on the first crank shaft portion; a second cycloidal gear provided on the second crank shaft portion and connected with the first cycloidal gear through the supporting crank shafts; a plurality of first ring pins provided around the outer circumference of the first cycloidal gear and in sliding contact with a plurality of teeth on the periphery of the first cycloidal gear; a first annular gear with the plurality of first ring pins; a plurality of second ring pins provided around the outer circumference of the second cycloidal gear and being in sliding contact with a plurality of teeth on the periphery of the second cycloidal gear; and a second annular gear with the plurality of second ring pins.

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 that is displaced from an axis of input and output shafts, and is supported by the housing to be rotatable about the axis of the input and output shafts relative to the housing, an oscillating face plate that eccentrically oscillates via the eccentric portion, such that its rotation relative to the housing is restricted, and an output shaft to which an internally toothed gear that internally contacts and meshes with an externally toothed gear formed on the oscillating face plate is mounted, and which is rotatable about the axis of the input and output shafts relative to the housing. As the input shaft rotates, a circumferential position at which the externally toothed gear and the internally toothed gear mesh with each other changes, and rotation of the input shaft is delivered at a reduced speed to the output shaft.

Abstract: In a reduction-transmission mechanism, a plurality of output members are arranged at such positions that a size that is the sum of a fitting clearance formed between an outer periphery of each output member and a corresponding one of needle roller bearings, a fitting clearance formed between the needle roller bearing and an inner periphery of an input member, which defines a corresponding one of a plurality of pin insertion holes, and a radial internal clearance in the needle roller bearing is smaller than a size that is the sum of a fitting clearance formed between a ball bearing and an outer periphery of an eccentric portion, a fitting clearance formed between the ball bearing and an inner periphery of the input member, which defines a center hole, and a radial internal clearance in the ball bearing.

Abstract: A speed reducer includes a rotation member including internal main rollers; a rear carrier including a central through hole and eccentric stepped-diameter holes; a front carrier including a central through hole and recesses; a front wheel including a first through hole, second through holes, and front rollers on an edge to be in contact with the main rollers; a rear wheel including a third through hole, fourth through holes, and rear rollers on an edge to be in contact with the main rollers; coupling members for holding the front carrier, the front wheel, the rear wheel, and the rear carrier together; outer gear assemblies each rotatably disposed in the eccentric stepped-diameter hole, the fourth through hole, the second through hole, and the recess; and a central gear unit being in gear mesh with the outer gear assemblies.

Abstract: A crankshaft has eccentric holes communicating with each other. The eccentric hole extends in the axial direction of the crankshaft from one end surface of the crankshaft and is disposed so as to be eccentric in the same direction as a cam section. The eccentric hole extends in the axial direction of the crankshaft from the other end surface of the crankshaft and is disposed so as to be eccentric in the direction of the eccentricity of a cam section. A centrifugal force due to the rotation of the crankshaft generates a force couple about an axis which is perpendicular to the axis of the crankshaft. The force couple is reduced by the eccentric holes. The cam sections are arranged around the axis of rotation with the phases shifted by 180 degrees from each other. As a result, a translational force acting in the direction perpendicular to the axis of the crankshaft is also reduced.

Abstract: Through holes are formed in a revolving gear which revolves while being engaged with a ring gear, and penetration pins for extracting rotation of the revolving gear are inserted in the through holes. The inner circumference of each through hole has a shape which becomes narrow toward its one end. A sliding member having a shape which becomes thin toward its one end is engaged with each penetration pin. The sliding member is biased in a tapered direction thereof by a biasing member to be in contact with the inner circumference of the through hole.

Abstract: In a reduction-transmission mechanism, an input member is arranged at such a position that a size obtained by adding a fitting clearance formed between a ball bearing and an outer periphery of an eccentric portion, a fitting clearance formed between the ball bearing and an inner periphery of the input member, which defines a center hole, and a radial internal clearance of the ball bearing is smaller than a size obtained by adding a fitting clearance formed between an outer periphery of each of a plurality of output members and a corresponding one of needle roller bearings, a fitting clearance formed between each of the needle roller bearings and an inner periphery of the input member, which defines a corresponding one of a plurality of pin insertion holes, and a radial internal clearance of each of the needle roller bearings.

Abstract: A speed change gear device is provided with a housing, a first member supported rotatably about a predetermined rotational axis, a shaft member formed with an external gear, an annular member formed with an internal gear meshing with the external gear, and a transmission mechanism for transmitting a rotational component only of the annular member to the shaft member or a disc member arranged to be rotatable relative to the housing. The external gear differs from the internal gear in the number of teeth. Further, the first member is formed with a receiving hole that receives the annular member at a position where the center of the annular member is at a predetermined distance from the rotational axis. Then, the annular member is received in the receiving hole rotatably relative to the first member.

Abstract: An external gear has a number of teeth differing from a number of teeth of an internal gear, and is maintaining in a meshing state with the internal gear. A center through hole and an offset through hole are formed in the external gear. The center through hole is formed at the center of the external gear, whereas the offset through hole is formed at a position offset from the center of the external gear. Column-shaped member of a carrier passes through the offset through hole. A pair of supporting members of the carrier respectively supports each end of the column-shaped member. A pair of grooves is formed on a surface of a shaft of a crank member at positions between which an eccentric rotation member of the crank member is interleaved. First rolling elements and first outer races are arranged between the supporting members and the grooves. The shaft of the crank member is supported so as to be capable of rotating with respect to the carrier and incapable of moving in its axial direction.

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: The multi-stage reducer includes a first-stage reduction part to which the rotation from a motor is input and a second-stage reduction part to which the rotation having undergone speed reduction by the first-stage reduction part is input. The second-stage reduction part is disposed on an outer circumference of the first-stage reduction part.

Abstract: When an outer ring is fitted to an inner periphery of an input member, which defines a center hole, and an inner ring is fitted to an eccentric portion with clearances in a reduction-transmission mechanism, in a state where tooth tips of the input member contact bottomlands of a rotation force applying member on a line perpendicular to a second axis and a fourth axis, a size between the second axis and a third axis is set to a size that is smaller than or equal to half of a size obtained by adding a diameter difference between an outside diameter of a ball bearing and an inside diameter of the input member, which defines the center hole, a diameter difference between an inside diameter of the ball bearing and an outside diameter of the eccentric portion and an operating clearance of the ball bearing.

Abstract: When a bearing includes outer and inner rings and the outer ring is fitted to the inner periphery of an input member, which defines a center hole, with a clearance and the inner ring is fitted to an eccentric portion with a clearance, a size between a second axis and a third axis is set to a size that is smaller than or equal to half of a size obtained by adding a diameter difference between an outside diameter of the bearing and an inside diameter of the input member, which defines the center hole, a diameter difference between an inside diameter of the bearing and an outside diameter of the eccentric portion and an operating clearance of the bearing in a state where the input member has been moved to contact the housing on a line perpendicular to the second axis and a fourth axis.

Abstract: In a reduction-transmission mechanism, a plurality of output members are arranged at such positions that a size that is the sum of a fitting clearance formed between an outer periphery of each output member and a corresponding one of needle roller bearings, a fitting clearance formed between the needle roller bearing and an inner periphery of an input member, which defines a corresponding one of a plurality of pin insertion holes, and a radial internal clearance in the needle roller bearing is smaller than a size that is the sum of a fitting clearance formed between a ball bearing and an outer periphery of an eccentric portion, a fitting clearance formed between the ball bearing and an inner periphery of the input member, which defines a center hole, and a radial internal clearance in the ball bearing.

Abstract: An eccentric speed reducer is provided with which it is possible to achieve improved output torque without increasing the outer radial dimension of the casing. A tapered side is formed on at least part of a peripheral side surface of struts 18, with the tapered side extending in a tapered manner in the longitudinal direction of the struts 18 in a direction that is oblique to a direction parallel to a center line P passing through a casing 14 so as to connect inner circumferential centers of the casing 14 and in which the struts 18 narrow toward an end carrier 17. A tapered side gradient that is the angle of a direction in which the tapered side extends relative to the direction parallel to the center line P is formed to be at least 3 degrees and at most 6 degrees.

Abstract: A reduction gear includes an outer circumference internally toothed gear having first teeth; and an inner circumference externally toothed gear having a second teeth. The reduction gear relatively rotates while the first teeth and the second teeth engage each other. At least one of the first and second teeth has an elastic structure inside the tooth so that the tooth is elastically deformable.

Abstract: A simultaneous multiple rotation interface where a series of discs rotate about an eccentric camshaft. Each disc is engaged with the other by a series bearings embedded within each disc. As the camshaft rotates, each disc alternatively engages an outer shell so as to rotate the shell in the same direction as the shaft, albeit at a reduced speed.

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 that is displaced from an axis of input and output shafts, and is supported by the housing to be rotatable about the axis of the input and output shafts relative to the housing, an oscillating face plate that eccentrically oscillates via the eccentric portion, such that its rotation relative to the housing is restricted, and an output shaft to which an internally toothed gear that internally contacts and meshes with an externally toothed gear formed on the oscillating face plate is mounted, and which is rotatable about the axis of the input and output shafts relative to the housing. As the input shaft rotates, a circumferential position at which the externally toothed gear and the internally toothed gear mesh with each other changes, and rotation of the input shaft is delivered at a reduced speed to the output shaft.

Abstract: A first reduction gear unit has a first input shaft that rotates in accordance with the rotation of an output shaft of a motor, a first external gear that revolves orbitally around an axis line of the first input shaft, and a first internal gear that has a number of teeth differing from the number of teeth of the first external gear. A second reduction gear unit comprises a crankshaft that rotates in accordance with the rotation of a first output shaft, a second external gear having a through hole formed at a center itself, a cylindrical member passing through the through hole of the second external gear, a second internal gear that has a number of teeth differing from the number of teeth of the second external gear, and a second output shaft that rotates around an axis line of the second internal gear. The first reduction gear unit is disposed between an outer circumferential surface of the second reduction gear unit and an inner surface of the cylindrical member.

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 stepper motor suitable for use in a medical imaging environment has (a) a cylindrical central gear having an external surface with circumferentially distributed and radially directed teeth, (b) a shaft for mounting the central gear such that it is constrained to move in rotational motion about its centerline, (c) a cylindrical hoop gear having a bore with an internal surface having circumferentially distributed and radially directed teeth, (d) level arm crank mechanisms for mounting the hoop gear such that it is constrained to move in translational-circular motion about the central gear's centerline, wherein this central gear is further configured to fit within the hoop gear's bore in such a manner that a plurality of the central gear and hoop gear teeth intermesh and cooperate so that the planetary movement of the hoop gear causes the central gear to rotate, and (e) piston mechanisms for applying a fluid pressure driven force to specified points on the hoop gear so as to cause its movement.

Abstract: A reduction gear transmission, a kind of eccentrically-oscillating-type reduction gear transmission, is provided with an internal gear, an external gear, a carrier, a crank member and a bearing mechanism. The external gear comprises a through hole at a position offset from its central axis. The carrier comprises a support shaft that extends into the through hole of the external gear. The crank member comprises a though hole into which the support shaft extends and an eccentric member that engages inside the through hole of the external gear. The central axis of the eccentric member is offset from a central axis of the support shaft. The bearing is disposed between the support shaft and the crank member, and supports the crank member such that the crank member is capable of rotating with respect to the central axis of the support shaft.

Abstract: Surface abrasion in an eccentric part of a crank pin or breakdown of the crank pin of an eccentric oscillation speed reducer is effectively prevented. A value N obtained by dividing reduction ratio M in an eccentric oscillation speed reducer by a diameter D passing a center of pin teeth is set to be smaller than 0.20. As the results, temperature of lubricant in the eccentric oscillation speed reducer can be depressed below 60° C., even though an output rotation speed at a rated torque of the eccentric oscillation speed reducer has become 28 rpm or more as required from a tact time or so in a factory, whereby a region between the eccentric part of the crank pin and a needle-shaped roller bearing is always lubricated with the lubricant which exerts required lubricating function.

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: A simultaneous multiple rotation interface where a series of discs rotate about an eccentric camshaft. Each disc is engaged with the other by a series bearings embedded within each disc. As the camshaft rotates, each disc alternatively engages an outer shell so as to rotate the shell in the same direction as the shaft, albeit at a reduced speed.

Abstract: The reduction gear includes a plurality of first and second rollers that are disposed so as to directly come into rolling contact with the outer peripheries of first and second eccentric bodies; first and second retainers that maintain gaps between the first and second rollers in the circumferential direction of the first and second eccentric bodies; and first and second guide bodies of which the movement in the axial direction is restricted and which restrict the movement of the first and second rollers in the axial direction by coming into direct contact with ends of the first and second rollers.

Abstract: A compact turning device for a heavy object, comprising a turning arm joined to the heavy object and a drive device drivingly turning the turning arm. The drive device further comprises a motor incorporating a rotor shaft connected to the rotating input part of a planetary gear type speed reducer on a same axis (A). Also, the turning arm is installed by joining its first plane to the plane of the planetary gear type speed reducer forming the rotating output part and its second plane orthogonal to the first plane to the heavy object. The turning arm and the drive device are disposed within the width (D) of the heavy object in the axis (A) direction of the turning pivot of the turning arm. The planetary gear type speed reducer of the drive device may be disposed in two front and rear stages.

Abstract: To provide an oscillating internally meshing planetary gear reducer capable of realizing a low cost and a high speed reduction ratio, the oscillating internally meshing type planetary gear reducer is constituted so as to include: an input shaft provided with an input gear which is circumscribed and meshed with a pinion provided on a motor; an input shaft gear formed on the input shaft; a plurality of eccentric body shafts each provided with an eccentric body for oscillating an oscillating external gear; an eccentric body shaft gear which is formed on each eccentric body shaft; and a distributing gear which is meshed with the input shaft gear and the eccentric body shaft gear.

Abstract: The present invention provides a center crank eccentrically oscillating speed reducer enabled to increase the available cross-sectional area of a hollow hole, while the generation of large noises is suppressed, as compared with the conventional center crank eccentrically oscillating speed reducer.

Abstract: A gear drive assembly (33) includes a housing (24), an external base (28) movable with respect to the housing, and an external gear member (12) associated with the external base. The assembly includes an internal gear member (14) surrounded by the external gear member and in meshing relation therewith. The assembly also includes a plurality of conductive polymer actuators (26) defining actuator sets. Each actuator set is coupled at one portion thereof to the housing with another portion thereof being coupled to the external base. Each actuator is constructed and arranged to deflect when voltage is applied thereto such that when voltage is selectively applied to the actuator sets, deflection of the actuators causes the external base to move causing the external gear member to move in an orbiting manner with respect to the internal gear member.

Abstract: An eccentric gear mechanism, comprising an input drive having a centric portion rotated about an axis and an eccentric portion; a movable inner ring gear having outer circumferential gear teeth, so that said centric portion and said eccentric portion of said input drive turn in one direction against said movable inner ring gear, said inner ring gear being configured in such a way that it allows an eccentric movement by said inner ring gear and transfers a given turning force derived by said inner ring gear in an opposite direction to said one direction; an outer ring gear having inner circumferential gear teeth partially engaged with said outer circumferential gear teeth of said inner ring gear, so that when said given turning force is derived by said inner gear ring in said opposite direction said outer ring gear rotates around said axis, and said outer ring gear transfers said given turning force in said one direction outwardly along said axis.

Abstract: A reduction gear includes a case including a hollow cylinder having teeth on its inner wall; a ring gear having outer teeth meshed with the teeth of the cylinder, and inner teeth; and an eccentric gear assembly mounted in the cylinder and including a hollow eccentric shaft including rear and front eccentric sections, and first and second gears rotatably secured onto the rear and front eccentric sections respectively. Rotating an input shaft in a first speed will rotate the eccentric shaft to rotate the first and second gears around the inner teeth of the ring gear eccentrically, thereby rotating the output shaft in a second speed lower than the first speed. The invention has an increased number of meshed teeth between each of the first and second gears and the ring gear so as to distribute a radial load to more teeth in rotation.

Abstract: A vehicle steering apparatus having a drive (101) which is coupled to a second shaft (2) with the longitudinal axis (8) via a disk cam mechanism, the disk cam mechanism comprising the following elements: at least one disk cam (3, 4) with an undulating outer contour (33, 34) disposed for eccentric rotation about the longitudinal axis (8) and with a central opening (30) around which holes 31 are arranged; a first carrier (16), which is arranged on a first shaft (1) and the axis of which lies in the longitudinal axis (8), having driving pins (17) circularly disposed on the carrier and engaging in the holes (31); a rotor shaft (6) arranged for coaxial rotation about the first shaft (1) and connected to the drive (101), carrying at least one eccentric (5) with an eccentricity (22) engaging in the central opening (30) of an associated disk cam (3, 4) to produce a rotating, laterally wobbling motion of the at least one disk cam (3, 4); a second carrier (18), which is arranged on a second shaft (2) and the axis of

Abstract: There is provided a pin and mounting assembly for supporting a gear of an epicyclic or parallel shaft transmission. The pin and mounting assembly comprises: a mounting (4) which has a first interference surface; and a pin (2) which has a second interference surface. The second interference surface is adapted for engagement with the first interference surface to establish an interference fit (6). The first and/or second interference surface defines an open ended volume such as a cylinder, cuboid or frustum and a longitudinal axis of the interference fit is defined as extending through the volume. A section through at least a part of the first and/or second interference surface on the longitudinal axis describes a curved interference depth with at least one maximum and/or minimum.