In a wave gear device, the inner race and the boss are fixed together by a laser welded part formed along the entire periphery thereof. The laser welded part also functions as an oil seal for sealing the inner race and the boss. The boss and the inner race are fixed together in a manner that a required axial length is short, and that machining and assembling steps are reduced. Oil seal members are not required to seal the boss and the inner race.

The current invention provides an automatic gear-shift drive mechanism including a first gear system having a first gear ratio, and a second gear system having a second gear ratio, wherein the first gear ratio is higher than the second gear ratio, and is biased to spin the drying assembly with the first gear system when the automatic gear-shift drive mechanism is driven and the workload is below a threshold workload, and switch to spin the drying assembly with the first and the second gear systems when the automatic gear-shift drive mechanism is driven and the workload is at or above the threshold workload.

The present invention provides a stirring device and gear train, the stirring device comprises at least one gear; at least one stirring tube; and at least one connecting portion connecting the gear and the stirring tube. Wherein the gear, the connecting portion, and the stirring portion are hollow, and the gear rotates the stirring tube via the connecting portion. Stirring is performed by utilizing the gear and the stirring tube in the stirring device of the present invention. Not only does the biggest flux be achieved per area, but the problem about cross contamination can also be reduced. In addition, in the gear train, the collimation of the stirring device can be increased by a specific hollow gear and a lengthened hollow bearing train forth in the gear train.

A cartridge includes a housing having a first wall and a second wall opposing each other, a drive-transmission member and a detected body rotatable about a first axis and a second axis respectively parallel to a first direction from the second wall toward the first wall. The detected body having a detected portion is movable first in the first direction and then in a second direction opposite to the first direction relative to the first wall while irreversibly moving from a first position to a second position, a distance between the detected portion and the first wall in the first direction being longer at the second position than at the first position. The drive-transmission member includes a first engaging portion engageable with the detected body at the first position and positioned upstream of an abutment portion abuttable with a receiving portion of the detected body in the first direction.

A strain wave gearing speed changing apparatus has a coaxial pair of circular splines including a first with tooth number T.sub.A and a second with T.sub.D. A coaxial pair of flex splines includes a first with tooth number T.sub.B and a second with T.sub.C. First flex spline meshes first circular spline and second flex spline meshes second circular spline at two, preferably more, meshing engagements. A wave generator is connected to one of the input and output shafts. Two flex splines are fixed together to operate flexingly on the wave generator with equal spline tooth engagement pitch circle circumference lengths. One circular spline is fixed to the apparatus frame and the other is connected to the other of the input and output shafts not connected to the wave generator. The four splines satisfy T.sub.A=T.sub.K+T.sub.i, T.sub.B=T.sub.K, T.sub.C=T.sub.KT.sub.j and T.sub.D=T.sub.K+T.sub.iT.sub.j.

A gear box for a reciprocating kneader. A primary rotational gear is attached to a gear box primary shaft and rotates in concert therewith. A secondary rotational gear is engaged with the primary rotation gear and rotates therewith. A secondary shaft is attached to the secondary rotational gear and rotates therewith. A primary oscillation gear is attached to the gear box primary shaft and rotates therewith. A secondary oscillation gear is rotationally engaged with the primary oscillation gear and rotates on the secondary shaft. An eccentric is coupled to the secondary oscillation gear and rotates in concert therewith. A yoke is engaged with the eccentric and oscillates on an axis perpendicular to the secondary shaft in response to the lobe. The gearbox secondary shaft moves along its axis in concert with yoke oscillation. A housing is pivotally attached to the yoke and pivotally attached to a casing at a casing.

A method and apparatus for a reciprocating kneader. A primary rotational gear is attached to a gear box primary shaft and rotates in concert therewith and engages a secondary rotational gear. The primary rotational gear drive provides a primary source of rotation for a kneading screw and for the secondary gear as a secondary source of rotation. An adjustable eccentric is coupled to the secondary oscillation gear and rotates in concert therewith for reciprocation motion.

A gear transmission system (20) comprising at least a first cylindrical gear (21) and a second cylindrical gear (22). Each of the first and the second cylindrical gears (21, 22) comprise a plurality of teeth (23, 26). The teeth (23) of the first cylindrical gear (21) having a first tooth flank (24) for contacting a first tooth flank (27) of the teeth (26) of the second cylindrical gear (22) according to a predefined first contact line (30). The first tooth flanks (24, 27) of the teeth (23, 26) of each of the first and second cylindrical gears (21, 22) have a tooth shape and tooth properties determined by the predefined first contact line (30).

There is provided a reduction gear unit including: a pinion; a bearing that is located on each of both sides of the pinion; a large gear that meshes with the pinion; a gear case that stores therein lubricant oil, and accommodates the pinion and the gear; and pinion bearing caps each of which includes an annular portion, wherein the annular portion extends from outside of the gear case toward inside thereof and parallel to a pinion shaft, and includes an end portion in which an end surface in an extending-direction is provided on a side of the pinion with respect to an extended line of a gear-side end surface of an inner race of the bearing, and an inner peripheral surface of the end portion is formed so that a diameter is decreased from a gear-side end surface of an outer race toward the end surface.