WAVE GEAR UNIT WITH INPUT BEARINGS
Granted: June 12, 2014
Application Number:
20140157925
A wave gear unit has an input shaft positioned along a center axis by first and second input bearings. A first unit end plate at the first-input-bearing side is a composite member in which a bearing housing member of an iron-based material is integrated with an end plate main body member of a lightweight material. A second unit end plate at the second-input-bearing side is integrated with a rigid internally toothed gear, and is a composite member in which a second member of a lightweight…
INTERNALLY-TOOTHED GEAR UNIT WITH COMPOSITE ROLLER BEARING, AND WAVE GEAR DEVICE
Granted: June 5, 2014
Application Number:
20140150586
A wave gear device (30) uses, as a bearing which supports a first rigid internally-toothed gear (31) and a flexible externally-toothed gear (33) so as to be capable of rotation relative to each other, a composite roller bearing (38) equipped with a first roller (53) and second roller (54) for thrust bearing use and a third roller (55) for radial bearing use. Compared to a cross roller bearing or an angular bearing, the composite roller bearing (38) can be implemented as a highly rigid…
Method for Optimizing the Forward Error Correction Scheme
Granted: March 13, 2014
Application Number:
20140075269
The present invention relates to a method for optimizing the FEC scheme comprising the steps of: (a) receiving a batch of data packets designated for transmission; (b) choosing a number of divisors having no common denominators in accordance with the said batch of data packets; (c) organizing into blocks said batch of data packets a number of times in accordance with the number of divisors using said divisors; and (d) creating a FEC packet for each of said blocks.
UNIT TYPE WAVE GEAR DEVICE
Granted: February 20, 2014
Application Number:
20140047938
A unit type wave gear device (1) has a unit housing (2), one end of which is defined by a two-stage cross roller bearing (7). The two-stage cross roller bearing (7) has: an inner cross roller bearing formed by an inner ring (13), an intermediate ring (12), and inner rollers (17) inserted into an inner track (16); and has an outer cross roller bearing formed by an outer ring (11), the intermediate ring (12), and outer rollers (15) inserted into an outer track (14). A flexible…
WAVE GEAR DEVICE HAVING THREE-DIMENSIONAL-CONTACT TOOTH PROFILE
Granted: February 20, 2014
Application Number:
20140047937
In a wave gear device, similarity-curve tooth profiles BC and AC are adopted as addendum tooth profile shapes for gears, the tooth profiles being derived from a movement trajectory M1 of an external tooth of a flexible externally toothed gear having zero deviation (?=1), in relation to an internal tooth at a main cross-section. Profile shifting is performed on the external tooth along the tooth trace for a movement trajectory M3 of the external tooth to share a bottom portion with the…
CONCENTRIC MULTI-AXIS ACTUATOR
Granted: February 6, 2014
Application Number:
20140033840
A concentric double axis actuator has a two-stage cross roller bearing, and a preceding-stage actuator and a subsequent-stage actuator which are linked in tandem. The front end of a subsequent stage rotary output shaft of the subsequent actuator, said subsequent stage rotary output shaft passing through a hollow section of the preceding-stage actuator and projecting forward, is linked and fixed to an inner ring of the two-stage cross roller bearing, and the inner ring functions as a…
RETAINER FOR ROLLER BEARING AND NEEDLE ROLLER BEARING
Granted: January 16, 2014
Application Number:
20140016892
A retainer for a roller bearing holds needle rollers within slit-shaped pockets which are formed separately by means of partitions arranged with a fixed pitch in the circumferential direction. Each partition is equipped with two side faces, which face the sides of the adjacent partitions, and an outer-circumferential-side end face, which faces the outer circumferential side of the retainer, and retaining protrusions are formed at the corner parts where the outer-circumferential-side end…
PLANETARY DIFFERENTIAL REDUCTION DEVICE
Granted: January 2, 2014
Application Number:
20140004989
When a first output shaft (5) of a planetary differential reduction device (1) is driven to rotate, a first internal gear (24) of a first planetary reduction part (20) and a second internal gear (34) of a second planetary reduction part (30) are rotated in the same direction at the same speed, and a planetary carrier (63) of a third planetary reduction part (40) is also rotated in the same direction at the same speed, whereby a second output shaft (6) connected to the planetary carrier…
WAVE GEAR DEVICE AND FLEXIBLE EXTERNALLY TOOTHED GEAR
Granted: December 5, 2013
Application Number:
20130319151
In a wave gear device, an annular rigid externally toothed gear is disposed on the inner side of a cup-shaped flexible internally toothed gear. An internal-tooth-formation portion of the flexible internally toothed gear and a pushed portion pushed by a wave generator and flexed ellipsoidally are formed in different positions along the center axis line. The wave generator is disposed on the inner side of the flexible internally toothed gear, the pushed cylindrical portion is pushed from…
WAVE GEAR DEVICE AND FLEXIBLE EXTERNALLY TOOTHED GEAR
Granted: December 5, 2013
Application Number:
20130319174
In a hollow wave gear device, a rigid internally toothed gear and a wave generator are disposed adjacent along a center axis line so as to enclose a cylindrical barrel part of a flexible externally toothed gear from the outside. A pushed cylindrical portion adjacent to an external-tooth-formed cylindrical portion of the cylindrical barrel part is pushed from the outside and made to flex into an ellipsoidal shape by the wave generator disposed on the outside thereof, whereby external…
WAVE GENERATOR OF WAVE GEAR DEVICE
Granted: November 28, 2013
Application Number:
20130316868
An externally toothed portion of a cup-shaped flexible externally toothed gear of a wave gear device is flexed into an ellipsoidal shape by a six-roller-type wave generator. A region of an inner peripheral surface of the ellipsoidally flexed externally toothed portion that is positioned on a major axis of the ellipsoidal shape is maximally inclined. First rollers of the wave generator are arranged so that the incline is identical to the incline of the region of the inner peripheral…
WAVE GENERATOR FOR WAVE GEAR DEVICE
Granted: November 28, 2013
Application Number:
20130316867
A wave generator for a wave gear device is provided with a pair of first rollers arranged in a position that is point-symmetric in relation to the center of a flexible externally toothed gear, a pair of second rollers, and a pair of third rollers. The first rollers are located on a long axis of the flexible externally toothed gear that is being flex into an ellipsoidal shape, and the second and third rollers are located in positions that are linearly symmetric in relation to the long…
WAVE GEAR DEVICE AND FLEXIBLE EXTERNALLY TOOTHED GEAR
Granted: November 28, 2013
Application Number:
20130312558
A cup-shaped flexible externally toothed gear of a wave gear device comprises a cylindrical body part, and an external-teeth area thereof includes a pushed portion pushed radially outward by a wave generator and a groove formed in a position adjacent to the pushed portion toward a diaphragm. The reaction force of the wave generator can be reduced because the groove is formed to partially reduce thickness in a portion that does not affect the root strength of the external teeth. The…
ROTARY ACTUATOR EQUIPPED WITH SENSING MECHANISM, AND JOINT UNIT
Granted: June 6, 2013
Application Number:
20130139636
A rotary actuator equipped with a sensing mechanism includes a motor and a reducer concentrically disposed inside a cylindrical housing; a scale for detecting the rotational position of a rotary arm, the scale being disposed on the circular outer face of the cylindrical housing; and a position sensor mounted in the facing section of the rotary arm that rotates along the circular outer face, the facing section being in a facing arrangement with the circular outer face. A detection…
SELF-CALIBRATION METHOD FOR ANGLE DETECTOR, ANGLE DETECTOR, CIRCUMFERENTIAL SCALE CALIBRATION DEVICE, AND ANGLE DETECTOR CALIBRATION DEVICE
Granted: May 16, 2013
Application Number:
20130124128
In a self-calibration method of an angle detector, an angle interval between first and second scale reader heads are set, so that a single rotation is not equally divided into an integer number of potions by a value of the angle interval and that a plurality of rotations N are equally divided into M equal portions by the value of the angle interval. Readings by the scale reader heads during N rotations of the divided circle are obtained at a pre-set data sampling interval. From…
Multi-Channel Variable Bit-Rate Video Compression
Granted: April 25, 2013
Application Number:
20130101052
Systems, method, and computer program products for providing multi-channel variable bit-rate video compression are described. In some implementations, video channels can be allocated with bit rates that are set based on a predefined video compression quality. More specifically, each channel can generate a table describing the set of video compression quality values each corresponding to a bit rate value that can be used to achieve that video compression quality value. To generate the…
WAVE GEAR DEVICE HAVING THREE-DIMENSIONAL CONTACTING INVOLUTE POSITIVE DEFLECTION TOOTH PROFILE
Granted: April 4, 2013
Application Number:
20130081496
In a wave gear device, an involute tooth profile with the low pressure angle ? (<20°) is employed as a basic tooth profile of external teeth of a flexible external gear. In the principal section of the external teeth, the tooth depth thereof satisfies 2?0mn=2(1+c) mn (deflection coefficient ?0=1+c, 0<c<0.5), which is larger than the standard one. The shifting of the teeth which takes into account coning is performed along the tooth trace direction of the external teeth, so that…
WAVE GENERATOR FOR WAVE GEAR DEVICE
Granted: March 28, 2013
Application Number:
20130079190
The flexible bearing of the wave generator for a wave gear device is a deep-groove ball bearing in which an outer race and an inner race form an annular flexible bearing ring capable of bending in a radial direction. A ball diameter Da is set to be 5 to 15% greater than that of each model of the currently available product. Dimensions of orbital plane radii ro, ri of the inner and outer races are set so that the ratio ro/Da of the orbital plane radius ro of the inner race and the ball…
SEALED ROTATIONAL OUTPUT UNIT AND SEALED MOTOR ASSEMBLY
Granted: March 7, 2013
Application Number:
20130057116
Provided with a sealed rotational output unit (3) which includes a tubular shaft (12) having an outer circumferential surface sealed with a ferrofluidic seal (13); a rotating output shaft (14) disposed inside the tubular shaft (12); and an O-ring (17, 18) that seals between the tubular shaft (12) and the rotating output shaft (14). When the rotating output shaft (14) is directly coupled to a hollow motor shaft (9), shaking thereof is absorbed by the O-ring (17, 18), causing no excessive…
WAVE GEAR DEVICE PROVIDED WITH TAPERED FLEXIBLE EXTERNALLY TOOTHED GEAR
Granted: December 6, 2012
Application Number:
20120304791
In an elliptical rim neutral line of each axially perpendicular cross section in a tooth trace direction of a flexible externally toothed gear of a wave gear device, external teeth are applied with addendum modification along the external teeth tooth trace direction so that the bending stress generated at the root rim surface of the external teeth that is caused by flexing of the flexible externally toothed gear is averaged out, the maximum value thereof can be reduced, and the…
