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 an angular position adjusting apparatus, tooth profiles of an internal gear 31 and an external gear 21 are formed according to loop shapes 74a and 84a of predetermined trochoid curves 74 and 84.

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: Elastic deformation of bridge portions in an externally toothed gear and external teeth is suppressed, and this extends the life of tooth surfaces of external teeth 19, improves vibration characteristics, and markedly increases output torque while preventing a planetary gear device 11 from becoming large in size.

Abstract: An inner motor is structured to increase the discharge rate of an internal gear pump by making it possible to freely adjust the eccentricity e between the inner and outer rotors. Each tooth of the inner rotor includes a tooth bottom defined by hypocycloidal curves, an engaging portion to be brought into engagement with the outer rotor and defined by involute curves, and a tooth top defined by a predetermined curve such as a part of a circle or an oval or an epicycloidal curve.

Abstract: A seat reclining apparatus includes an internal gear, an external gear, an eccentric drive mechanism, and a base plate. The internal gear is secured to a seatback arm. The external gear includes an external tooth portion being in meshing contact with the internal gear, the external tooth portion having a smaller number of teeth than the internal gear. The eccentric drive mechanism rotates the external gear with respect to the internal gear in meshing contact with the internal gear. The base plate is secured to a seatcushion arm. The base plate includes an internal tooth portion press-fitted to the external tooth portion of the external gear. The internal tooth portion of the base plate includes a part press-fitted to the external tooth portion of the external gear and a part loose-fitted to the external tooth portion of the external gear.

Abstract: A toothless gear speed reducer, which mainly includes an inclined plane cone drive gear, inclined plane conical driven gears and an inclined plane outer gear case drive ring. The toothless gear speed reducer overcomes the difficult problems existent in conventional speed reducers to decrease dimensions and minimize abrasion, and achieves reducing manufacturing time, thereby providing higher efficiency and saving on manufacturing cost.

Abstract: A device for adjusting two parts (2, 3) relative to one another, other than for a displacing device which is provided displacing a camshaft. The adjusting device is smooth and easy to operate, is self-locking, and ensures a backlash-free, continuous displacement of the two parts with a high degree of efficiency. The device includes a first part (2) having webs (2.3, 22.3) which are spaced apart in the circumferential direction and between which chambers (2.4) are provided, a second part (3) having an internal toothing (3.2, 13.2), and several teeth (7, 27) that are disposed at a distance from each other in the circumferential direction within the chambers and have an inner contact area (7.4) for resting against an eccentric drive member (6) as well as an outer contact area (7.5) for engagement with the internal toothing (3.2, 13.2). Rotary movements can be performed by the teeth (7, 27) located within the chambers (2.

Abstract: An internal planetary gear mechanism reduces a load applied to tooth surfaces of an external gear and an internal gear, a sliding portion such as a bearing and the like. By setting the amount of eccentricity ? of an eccentric part to be larger than a theoretical value, a distance between the center of the external gear and the center of the internal gear is increased to allow the reduction of a loss in the bearing and on the tooth surfaces of the gears, and a mesh zone between the internal gear and the external gear can be reduced to decrease a part at a large pressure angle, thereby reducing a loss generated by a large pressure angle. As a result of reduction in the mesh zone between the external gear and the internal gear, rolling contact of the gears is maintained.

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: A two-stage epicyclic roller cam transmission comprising in each stage: a roller ring having a plurality of fixed-position rollers; and a cam gear having pitch-circle-generated, trochoid-shaped teeth and independent pitch, wherein the rollers are spaced to mesh with the cam gear and efficiently transfer energy under heavy loads.

Abstract: The invention relates to a series of gearboxes consisting of single- or multi-stage gear systems in at least one size category, each of which comprises one or more variants, such that each variant incorporates at least one double-shaft, reversible planetary stage consisting of a combination of an open positive gearbox having lantern-gear teeth with at least one planetary gear and an output system, wherein the lantern-gear arrangement can be specified by a number z1, in particular a number z1 of rollers (26), and wherein a number of teeth z2 can be assigned to at least one planetary gear (21, 22), and wherein within a given size category the index i can be assigned to the value z1 of the variants within this size category and the index j can be assigned to the value z2 of the variants within this size category to form a matrix Mij=(z1i, z2j) (in particular a matrix doubly indexed with ij), and wherein the matrix with index k comprises identifiable subsequences Sk, such that the variants within a given s

Abstract: This document discloses a transmission having a roller cam assembly which comprises a pair of drive shafts, one an input shaft and the other an output shaft, wherein one of said shafts is attached to a toothed cam having a trochoidal profile and the other drive shaft is attached to a roller ring having a plurality of cylindrical roller shafts aligned to mesh with said toothed cam and thereby permitting the transfer of torque from one shaft to the other.

Abstract: A gear profile for orbital gear transmission is disclosed in which an outer gear (10) and an inner gear (30) are included. At least one of the gears is constrained for orbital motion to impart rotary motion to the other of the gears. The profile of teeth (34) of inner gear (30) is sinusoidal at least in the vicinity of pitch circle (36) of the gear (30) and the pitch circle (36) coincides with the point of inflection (52) of the sinusoidal profile of the teeth (34). The outer gear (10) has a pitch circle (25) and the point of inflection (19) of the inner gear (30) rolls across the point of the profile of teeth (14) of the outer gear (10) where the pitch circle (25) intersects the profile of the teeth (14). Orbital transmission systems are disclosed in which one or the other of the inner gear (10) or outer gear (30) is mounted on an eccentric (63) which is driven by an input shaft (64).

Abstract: The invention relates to a harmonic reduction gear comprising a drive-side eccenter (12) which engages into a complementary opening (13) of an outer toothed member (14), and a housing-fixed inner toothed ring (15) which is arranged around the outer toothed member (14) and on which the outer toothed member (14) rolls with the reversed rotational sense as the eccenter (12) when the eccenter (12) is rotated.

Abstract: An internally meshing planetary gear device which comprises an internal gear having a circular arc tooth form and an outer gear of a planetary gear having an epitrochoid tooth form, the internal gear comprises pins, both ends of which are supported, and rolling bearings inserted onto the pins, and the rolling bearings have outer races meshing with the outer gear.

Abstract: In order to miniaturize a speed change gear assembly, the respective gears are arranged in the order of the first gear A.sub.1, the second gear A.sub.2, the fourth gear A.sub.4 and the third gear A.sub.3 in an axial direction (X-axis direction). A center of the common spherical surface passing through each pitch circle of the first and second gears is made in accordance with the center of the common spherical surface passing through each pitch circle of the fourth and third gears. The center is used as the origin O. An XY coordinate is provided on the origin O. An axis line of an input shaft is arranged on the X-axis of the XY coordinate. An engagement point between the first and second gears A.sub.1 and A.sub.2 and an engagement point of the fourth and third gears A.sub.3 and A.sub.4 are arranged in the same quadrant of the XY coordinate. The first to fourth gears are arranged on the same axial direction surface of a rotary member 3.

Abstract: A strain wave gearing is provided with tooth profiles formed taking into account tooth inclination and change in the movement locus of the origin of the tooth profile coordinates, thereby obtaining proper meshing over a wide range. Specifically, a tooth module is denoted as m; the number of teeth of the rigid internal gear as z.sub.C ; the number of teeth, the deddendum, the thickness of the tooth bottom rim and the radius of the neutral circle of the rim of the flexible external gear as z.sub.F, h.sub.fF, t and r.sub.n, respectively; the coefficient of tooth thickness increase of the rigid internal gear and the coefficient of tooth thickness decrease of the flexible external gear both as .tau.; and an auxiliary angle variable .eta.. The basic addendum profiles of both gears are formed according to two equations, taking an x-axis on a datum line and a y-axis on the tooth center line and taking .+-. of the first equation as positive for the flexible external gear and as negative for the rigid internal gear.

Abstract: Trochoidal tooth form gear assemblies for in-line mechanical power transmission, gear reduction and differential drive employ internally meshed gear sets having differing numbers of trochoidal gear teeth, all of which are in continuous contact as one gear rotates and orbits relative to another. Coupling and output rotors having external trochoidal gear teeth profiles rotate and/or orbit in mesh with conjugate internal trochoidal gear teeth in stators or coupling rotors. A differing number of teeth between the meshed external and internal gear teeth provides gear reduction of rotational speeds through axially aligned input and output shafts. In certain embodiments, couplers are eccentrically mounted upon axially extending pins to translate the orbital motion of a meshed gear to shaft rotation. The gear sets can be combined in series to provide various gear reduction ratios as functions of the differing number of meshed gear teeth.

Abstract: The silk-hat-shaped flexible external gear (13) of a silk-hat flexible meshing gear device (11) comprises a body (22), a diaphragm (23) and a boss (25). Between the main portion of the body (22) and a curved portion (222) is formed a thinned portion (221) whose thickness is about 80% that of the main portion. The thickness of the diaphragm (23) is defined to be largest at the inner edge (point A), smallest at the middle portion (point B) and slightly smaller than the largest thickness at the outer edge (point C). To make the change in thickness smooth throughout, the contour is defined by use of a group of curved lines (223, 224). Providing the thinned portion (221). and defining the thickness of the diaphragm (23) in the foregoing manner relieves stress concentration at the inner and outer edges and smooths the stress distribution. As a result, the axial length and the outer diameter can be reduced to realize a compact silk-hat flexible meshing gear device.

Abstract: An internal planetary gear device having an input shaft, an eccentric body rotating with the rotation of the input shaft, an external gear eccentrically rotatably mounted on the eccentric body through a bearing, an internal gear internally meshing with the external gear, and an output shaft connected to the external gear through a device for taking up only components of rotation of the external gear, wherein, each component is manufactured of resin, and one of the internal teeth of the internal gear and the external teeth of the external gear is formed into a tooth profile including an inner envelope configuration of curtate epitrochoid theoretical curve C, while the other, into a convex circular tooth profile.

Abstract: An eccentric gear comprises first and second gear rings (7,10) of which the one (7) has internal, straight cogs and the other (10) a smaller number of external cogs. At least one gear ring has a conical form with a large end (A--A) and a small end (B--B), the other gear ring (10) having a smaller pitch diameter than the first one (7) and being eccentrically mounted in bearings relative to the first one. Axes of symmetry (24,25) of the respective gear rings form an angle (.alpha.) with each other. The contact points or the locations of engagement between the flanks of the cogs in the one gear ring and the opposed flanks of the cogs in the other gear ring are substantially located along a helical line which extends in axial direction between said large and small ends.

Abstract: A planetary gear apparatus comprising an inner tooth gear having an inner peripheral portion formed with a plurality of inner teeth each in the form of a semi-circular cross-section shape and an outer tooth gear positioned within the inner tooth gear and having an outer peripheral portion formed with a plurality of outer teeth each in the form of a wave shape. The outer tooth gear has a center axis offset at an offset amount from the center axis of the inner tooth gear, and revolvable while being held in sliding and meshing contact with the inner tooth gear with the center axis of the outer tooth gear moving on a revolution orbit encircling and spaced from the center axis of the inner tooth gear at a distance equal to the offset amount.

Abstract: A gear structure including an internal gear and an external gear meshed together and moved relative to each other through a rotary motion, the radius of the root arcs of the teeth of the external gear being M, which is the ratio between the diameter of the crest and the number of teeth, and being the line of arc in tangent with the crest arcs of each two adjacent teeth, the tooth form curve of the internal gear being obtained by connecting all engaging points at the crest arcs and root arcs of the external gear.

Abstract: A differential apparatus includes a differential casing (21) rotated by an engine drive power; pinion gears (51, 53) slidably and rotatably accommodated in accommodating holes (47, 49) formed in the differential casing (21); a pair of side gears (31, 33) linked with each other via the pinion gears, for transmitting the engine drive power to vehicle wheels differentially; and device (69, 73, 81, 91, 99, 101, 103, 107, 109) for supplying lubricant to sliding surfaces between inner walls of the accommodating holes and the pinion gears.

Abstract: In a conventional internal gear pair system such as a planetary gear system with a small gear ratio of the internal gear to the driving pinion, common problems include tip interference and limited contact between the teeth of the gears. An internal gear pair system which avoids these problems includes a pinion meshing with an internal gear, the pinion having as few as one tooth less than the internal gear, the only contact between the pinion and the internal gear being on at least one side of a line extending diametrically through the centers of the pinion and the internal gear, and the teeth of the pinion being conjugate to the internal gear teeth.

Abstract: The vehicle seat articulation includes a fixed flange fixed to a first framework of the seat, a mobile flange rigidly connected to a second framework of the seat, a cup member enabling the mobile flange to execute an orbital movement causing an angular movement of the articulation, and a dish member maintaining the mobile flange against the fixed flange. The edge of the dish member is formed with an outer toothing that cooperates with toothings of semi-cut portions of the mobile flange. The toothings of the edge of the dish member and the toothings of the semi-cut portions have each a height equal to twice that of an off-center distance "e" provided between two shoulders of the cup member.

Abstract: A hybrid transmission provides a continuous range of reduced output speeds in a coaxial relationship about a common central axis within a surrounding cylindrical housing. The input shaft speed is increased through a planetary transmission having a sun gear fixed to a variable eccentric shaft. The eccentric shaft is surrounded by an orbiter and spaced anchor and drive vanes, which are interconnected by a plurality of anchor and drive vanes. Output speed is varied by change of the degree of eccentricity, using a worm gear drive interposed between inner and outer eccentrics within the eccentric shaft. control is achieved through shift rings that rotate a worm in response to external cable tension.

Abstract: An internally meshing planetary gear structure or a flexible meshing type gear meshing structure is intended to achieve the lightening, miniaturization and high load capacity by increasing the meshing points of the gear even is the difference in the teeth number between the external gear and the internal gear is two or more. The difference in the teeth number between each of the external gears and the internal gear is set to be N (N: integer being two or more), the tooth profile of the external gear is constructed on the basis of the innermost curve of the epitrochoid parallel curves in N pieces which are superposed to be shifted in phase from each other, and the tooth profile of the internal gear is constructed on the basis of the innermost curve of the trochoid internally enveloping curves in N pieces which mesh with the above epitrochoid parallel curves and which are superposed to be shifted from each other by the same phase as in the external gear.

Abstract: A two-stage speed reducer including a planocentric gear arrangement which has a rotatable output ring gear and a planet gear mounted within the ring gear for orbital movement. The teeth on the ring gear and the planet gear are tapered to permit axial adjustment of the planet gear with respect to the ring gear and thereby eliminate backlash between the two. Adjustment means is provided to permit axial adjustment of the planet gear with respect to the ring gear. After a period of use of the speed reducer, the planet gear may be readjusted axially relative to the ring gear to compensate for backlash created between the teeth of the planet gear and ring gear due to wear.

Abstract: A series of speed increasing and reduction gear having an inscribed meshing type planetary gear construction, in which within the same frame number (sub-series) with a tie-in dimension to a mating machine being constant, on both high and low speed change ratio sides, sufficient dynamical strength is secured, parts may be used in common with each other, and general-use bearings which are low in cost and high in accuracy can be employed.

Abstract: The device comprises a driving hub (4, 18) coaxially connected to one shaft (20) and oscillatably engaging a number of planetary gear elements (8, 25) homogeneously distributed around the axis of said hub. The planetary gear elements (8, 25) are engaged between a driven crown wheel (6, 21) which is coaxially fastened to a second shaft (3, 23) and an intermediate crown wheel (7, 24) oscillatably linked to the driven crown wheel (6, 21). The planetary gear elements (8, 25) driven in rotation by the hub (4, 18), are guided by the driven crown wheel (6, 21) and the intermediate crown wheel (7, 24) according to an elliptic path submitting them to a cyclic reciprocating movement relative to the axis of the driving hub (4, 18). An actuator (12, 35) tends to cause the driven crown wheel (6, 21) and intermediate crown wheel (7, 24) to rotate in opposite ways in view of transmitting resultant forces counteracting their being driven by the hub (4, 18) to the planetary gear elements (8, 25).

Abstract: This geared motor comprises an outlet shaft (2) of the motor (1), carrying two coaxial screws (3, 4) offset axially and of mutually opposed screw pitch, two gearwheels (5, 6) located on either side of the shaft and each interacting with a screw (3, 4), an axle (7, 8) fastened to each gearwheel and extended by a crankpin (9, 11) eccentric relative to the corresponding axle (7, 8) so as to be capable of executing rotations about this axle, an element (12) equipped with a toothing (13) and linked to the crankpins in such a way as, during the rotation of the crankpins, to be driven in a circular translational movement, the radius of which is equal to the eccentricity of the crankpins, and a member (16) equipped with an output shaft (18) connectable to the component to be driven and carrying a toothing (17) interacting with that of the element so as to bring about a rotation of the member (16) in a ratio determined by the difference in the numbers of teeth of the two toothings.

Abstract: A spur pump gear system comprising; a housing have a sealed chamber communicating with an intake port and a discharge port; a shaft journalled for rotation within said chamber; a drive spur gear mounted concentrically on said shaft about a first axis within said chamber, said drive spur gear presenting epi and hypo cycloid tooth profiles; a driven spur gear disposed internally within said chamber for rotation about a second axis, said driven spur gear presenting epi and hypo cycloid tooth profiles; said epi hypo cycloid tooth profile of said drive spur gear engagedly driving said hypo cycloid tooth profile of said driven spur gear.

Abstract: The arc gear with a rotary transmission of 1:1 has an inner toothed toothwheel, an outer toothed toothwheel, each connected to a shaft, one of the shafts being for drive and one for output. The shafts are arranged eccentrically with an eccentricity and parallel to one another. There are provided concave power transmission surfaces, with a first radius of curvature measured from the centers of first circles, on teeth of one of the toothwheels, and convex power transmisison surfaces, with a second radius of curvature measured from the centers of second circles, on teeth of the other of the toothwheels, both of the toothwheels having the same number of power transmission surfaces. Two of the concave power transmission surfaces lie on the same one of the first circles. Two of the convex power transmission surfaces lie on the same one of the second circles. The first radius and the first circles are bigger than the second radius and the second circles.

Abstract: A planetary drive containing two gear wheels with differing numbers of teeth and a radially flexible planetary wheel in engagement with these gear wheels. The planetary wheel has internal teeth and external teeth and is arranged at least partially in an annular gap between a hollow wheel and a sun wheel. The planetary wheel is forced by a cam element into the gaps between the teeth of the gear wheels in engagement zones. There are four engagement zones distributed around the circumference of the planetary wheel in which the teeth of the planetary wheel engage either the hollow wheel or the sun wheel. A roller bearing is provided between the cam element and the planetary wheel. The drive has a short axial structural length and a low manufacturing cost, assures uniform loading of the gear teeth, and enables the reduction ratio to be selectively predetermined throughout a large range.

Abstract: The compact high-ratio speed reducer without play consists of an external housing in which a first shaft is rotatingly arranged, carrying a planetary element on which a first gear is loosely supported, this gear having two toothings, one of which is in engagement with a crown wheel integral with the external housing and coaxial with the first shaft, and the second is in engagement with a further gear, integral with a second shaft supported within the external housing and coaxial with the first shaft. The gear toothings are urged together to eliminate possible play between the toothings in mutual engagement.

Abstract: This invention involves a gear transmission mechanism and its device which incorporate double cycloidal equidistant conjugated gear mechanisms and devices, featuring in that a whole branch cyclic cycloidal equidistant curve at a side of the center of curvature of that cycloid is applied with the value of equidistance equal to or smaller than the radius of the rolling circle as the original tooth profile and thus conjugated mutually enveloping cycloidal equidistant curved gear mechanisms with one-tooth-difference, zero-tooth-difference or multi-tooth-difference can be made according to the requirement. Motor pumps and reducers made according to these mechanisms have the advantages of smaller sliding coefficient, smaller pressure angle, greater speed ratio range, lower noise, better strength, higher efficiency, more convenience in machining and lower cost. Therefore these mechanisms can be used to effectively replace the cycloidal lantern gearing with promising development of novel gear transmissions.