Abstract: A strain wave gearing has a wave generator for generating a wave motion that repeatedly flexes each part in the circumferential direction of an externally toothed gear in the radial direction. The wave generator is provided with a plurality of wave-generating members arranged at positions at a prescribed angular interval along the circumferential direction of the externally toothed gear. Each of the wave-generating members is provided with an outer circumferential cam surface, rotates centered on a rotation center line that is parallel to the device center axis line, and repeatedly flexes each part of the externally toothed gear in the radial direction with a prescribed amplitude. A strain wave gearing, which is suitable for forming a large device hollow part, can be obtained.

Abstract: An automatic manual transmission comprising: a first sub-transmission configured for establishing even-numbered (2nd, 4th, 6th) gears and the reverse gear by a plurality of gear pairs (42/52, 44/54, 46/56, 40/50), and a second sub-transmission configured for establishing odd-numbered (1th, 3rd, 5th, 7th) gears by a plurality of gear pairs (41/51, 43/53, 45/55, 47/57); one or more output shafts (14, 15); one or more intermediate shafts (71, 72, 73, 74) each of which is coaxially and rotatably mounted either to an input shaft (11, 12) or to an output shaft (14, 15) and kinematically interposed between an output shaft and an input shaft; wherein said first sub-transmission is connected and disconnected to and from the output of the transmission by means of a first synchronizer (S1), and said second sub-transmission is connected and disconnected to and from the output of the transmission by means of a second synchronizer (S2).

Abstract: A robot includes a first member, a second member provided rotatably with respect to the first member, a gearing that transmits drive power from one side to the other side of the first member and the second member, the gearing includes an internal gear, an external gear having a flexible barrel portion in a tubular shape with an opening portion in an end part, and rotating about a rotation axis relative to the internal gear, and a wave generator, the wave generator includes a cam having a non-circular outer circumferential surface, and a bearing including an inner ring, an outer ring, and a plurality of balls, the first member includes a counter body provided to face the end part on the opening portion side of the barrel portion, and a first seal member is provided between the outer ring and the counter body.

Abstract: A dual clutch transmission for a motor vehicle, with gear wheel sets, which can be engaged via shift elements and which form exactly eight wheel planes, which are associated with respectively a first sub-transmission and a second sub-transmission. Each sub-transmission has a respective input shaft and the two sub-transmissions have an output shaft, which is axis-parallel to the input shafts. The mutually coaxial input shafts can each be activated via a power-shift clutch in alternation and the even forward gears are associated with the first sub-transmission and the odd forward gears are associated with the second sub-transmission, which can be engaged when a gear shift occurs via the shift element.

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 bearing system having a housing component, a shaft being supported in the housing component with the aid of a bearing, especially using a roller bearing, wherein the bearing is accommodated in a stepped bore in the housing component, which especially extends through the housing component, a lid part seals the stepped bore, especially with respect to the outside, the lid part is frictionally connected to the housing component, the lid part is accommodated in the stepped bore, a surface section of the outside of the lid part is situated in alignment with a step of the stepped bore, in particular in such a way that the surface section is situated on an axial position of the step.

Abstract: A transmission structure of a drilling machine contains: a housing, a drive shaft, a drive gear, a guide gear, a speed change gear assembly, a driven gear assembly, and a control knob. The housing include a first accommodation groove for housing the drive shaft, a second accommodation groove for accommodating the guide shaft, a third accommodation groove for housing the speed shaft, and a fourth accommodation groove for accommodating the driven shaft. The drive gear is connected on the drive shaft, and the guide gear is coupled on the guide shaft and meshes with the drive gear. The speed change gear assembly includes a connection gear and at least two speed change gears. The driven gear assembly includes at least two driven gears corresponding to at least two speed change gears respectively. The control knob configured to drive the driven gear assembly to move upward and downward.

Abstract: Provided is a shift control arrangement in a gearbox, comprising a first shift rod with a first end part connectable to a first power means and second end part connected to a first shift fork; a second shift rod with first end part connectable to a second power means and second end part connected to a second shift fork; a first set of grooves in the first shift rod, a second groove in the second shift rod; and a lock pin between the first and second shift rods, which lock pin, with the first set of grooves and the second groove restrict and/or allow axial movement of the respective first and second shift rods. The first end part of the first shift rod is provided with an axial directed cut out for non-conflicting with the lock pin, and the first end part of the second shift rod is provided with a control surface for axial movement of the lock pin.

Abstract: The flexible external gear of a strain wave gearing is provided with: a cylindrical body part capable of flexing in the radial direction; external teeth formed on the outer circumferential surface thereof with a constant pitch; and grooves formed on the inner circumferential surface of the cylindrical body section along the circumferential direction thereof with the same pitch as the external teeth. The grooves are grooves with a wave-shaped cross-sectional shape having the center line of the tooth crest of the external tooth as the center and extend in the width direction of the external teeth. It is possible to increase the tooth bottom fatigue strength of the flexible external gear by increasing the tooth bottom thickness, while maintaining ease of flexing and a tooth shape that can withstand tangential forces due to meshing.

Abstract: A power transmission device includes first and second engaging elements, a power transmission, and first and second bearings. The first engaging element is rotatable with a first rotation shaft about a rotation axis. The second engaging element is rotatable with a second rotation shaft about the rotation axis. The power transmission is provided between the first engaging element and the second engaging element. The first bearing is provided between the rotation axis and the second engaging element in a radial direction with respect to the rotation axis and supports a first part of the second engaging element. The second engaging element is between the second bearing and the rotation axis in the radial direction. The second bearing supports a second part of the second engaging element. The second part is farther from the first engaging element in an axis direction than the first part.

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: A bicycle transmission hub includes: a hub shaft to input a rotation force is input, the hub shaft having first pawls arranged on the outer peripheral surface thereof; a transmission controller for controlling the first pawls to appear and disappear; driving gears, each having a ratchet formed on the inner peripheral surface thereof to receive a rotation force by the first pawls, the driving gears having a different number of teeth, the hub shaft extending through the center of each driving gear; driven gears engaged with the driving gears, respectively, having a different number of teeth, and rotating; an output wheel rotating while being coupled to a driving gear adjacent thereto among the driving gears and having a second pawl disposed on the outer peripheral surface thereof; and a hub shell having a ratchet formed on the inner peripheral surface thereof to receive a rotation force by the second pawl.

Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of ?=1 of the teeth of the external gear with respect to those of the internal gear in the principle cross-section taken at the center of the tooth trace of the external gear obtained when the tooth meshing is approximated by rack meshing. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of ?=1 by the teeth of the external gear with respect to those of the internal gear. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: A gear-driven bearing unit comprising a housing, a drive gear and a rolling element bearing The rolling element bearing comprising: an outer member with teeth for meshing with drive gear teeth, an inner member and rolling elements between the inner and outer members. At one axial side, the housing is connected to the inner member enclosing the outer member. A first radial gap extends between an outer member radially inner surface and an inner member radially outer surface. A second radial gap exists between an outer member radially outer surface and a housing radially inner surface. The radial gaps are sealed by seals, each comprising radial sealing lips. The unit is lubricated with a grease comprising a calcium-based thickener or calcium salt additives and the teeth on the outer member are made of a hardening treated bearing-grade steel which diffuses nitrogen into the surface of the teeth.

Abstract: A governor drive gear for use in an integrated drive generator has a gear body extending between a first end and a second end and having a disc extending radially outwardly. A boss extends from the disc toward the second end. There are outer gear teeth outwardly of an outer diameter of the disc. The outer gear teeth have a unique gear tooth profile with roll angles A, B, C, and D. An integrated drive generator and a method are also disclosed.

Abstract: A rotary actuator has: one motor, two strain wave reduction gears disposed symmetrically on both sides of the motor, and one output shaft. The output rotation of the motor is reduced in speed at the same reduction ratio by the two strain wave reduction gears and is outputted from the output shaft to a load side. The first and second externally toothed gears of the first and second strain wave reduction gears are flexed into ellipsoidal shapes with 90 degrees shifted in phase, and are meshed with first and second internally toothed gears. The angle transmission errors of the first and second strain wave reduction gears transmitted to the output shaft are reduced by cancelling each other out in the output shaft. Reduced-speed output rotation that has the reduced angle transmission errors is outputted to the load side from the output shaft.

Abstract: A two-color molding method in which, when a secondary molded body is formed by covering the surface of a primary molded body made of a reinforcing-fiber-containing synthetic resin material with a reinforcing-fiber-free synthetic resin material, these synthetic resin materials may differ and the production cost does not increase. When a primary molded body is formed by injecting a molten reinforcing-fiber-containing synthetic resin material into a primary molding cavity, the molten reinforcing-fiber-containing synthetic resin material flows from one end toward the other end of the primary molding cavity and a short shot is performed. This exposes reinforcing fiber in a tooth of the primary molded body positioned at the other end of the primary molding cavity. In the secondary molding cavity, the tooth in which the reinforcing fiber is exposed is covered with a reinforcing-fiber-free synthetic resin material to form a synthetic resin gear as a two-color molded body.

Abstract: An accessory system for a gas turbine engine having a driveshaft with an axis of rotation is provided. The system includes a towershaft coupled to the driveshaft and rotatable about a towershaft axis of rotation. The towershaft includes a towershaft bevel gear. The system includes a primary shaft including a first bevel gear and a second bevel gear that each revolve about a primary shaft axis of rotation. The first bevel gear is coupled to the towershaft bevel gear. The system includes a secondary shaft including a third bevel gear and a fourth bevel gear that each revolve about a secondary shaft axis of rotation. The third bevel gear is coupled to the second bevel gear. The system includes a tertiary shaft including a fifth bevel gear that revolves about a tertiary shaft axis of rotation. The fifth bevel gear is coupled to the fourth bevel gear.

Abstract: An assembly of a robot includes a first member, a second member rotatably connected to the first member to construct a robot joint structure, a driving assembly arranged within the first member, a speed reducer assembly to rotatably connect the first member to the second member, and a belt drive assembly connected to the driving assembly and the speed reducer assembly. The belt drive assembly is used to transmit rotary motion from the driving assembly to the speed reducer assembly, thereby rotating the first member with respect to the second member.