A robot joint structure includes a motor configured to be used for a robot joint shaft capable of turning about a vertical axis, a motor-side gear mounted on a shaft of the motor, an auxiliary bearing configured to axially support the shaft supplementally, an adapter configured to integrate the motor, the motor-side gear, and the auxiliary bearing, and a moving mechanism configured to move a unit structure integrated by the adaptor in a radial direction of the motor such that the motor-side gear approaches a mating gear meshing with the motor-side gear.

A drive unit includes a housing and a pinion having a head and a shaft. The shaft extends through a pinion-support portion of the housing. A tail bearing supports the shaft and has an outer race fixed to the pinion-support portion and an inner race received on the shaft. The inner race is brazed to the shaft. The drive unit may be assembled by installing a tail-bearing cup and a head-bearing cup in the housing and inserting the pinion in the housing with the shaft extending through the cups. The method further includes installing a tail-bearing cone onto the shaft to be seated on the tail-bearing cup and urging the cups toward each other. The method also includes brazing the tail-bearing cone to the shaft while the cups are urged toward each other.

A power transmission device configured to transmit a power inputted thereto from a motor to a wheel is disclosed. The power transmission device includes a first support member, a first gear, a second support member attached to the first support member, a second gear, and an adjustment mechanism. The first gear is supported by the first support member, and configured to rotate about a first axis. The second gear is supported by the second support member, meshed with the first gear, and configured to rotate about a second axis. The second axis is approachable to and separable from the first axis. The adjustment mechanism is configured to adjust a distance between the first axis and the second axis.

A planetary gear assembly (30) and method of assembly in an electric camshaft phaser (20) with a split ring gear including a drive-side ring gear portion (32) rotatable by an engine crankshaft and an output-side ring gear portion (34) that can be connected to a camshaft (22). A plurality of rotatable planetary gears (36a, 36b, 36c) can be interposed between the split ring gear and the sun gear (28). The output-side ring gear portion (34) can have a different number of teeth than the drive-side ring gear portion (32) by a value corresponding to a multiple of the number of planetary gears (36a, 36b, 36c). A compliant planetary gear carrier (40, 140) can support the plurality of planetary gears (36a, 36b, 36c) allowing variance of a normally equidistant distance between separate spaced rotational axes of at least two of the planetary gears (36a, 36b, 36c) to selectively compensate for mechanical tolerances of the drive-side ring gear portion (32) and the output-side ring gear portion (34) of the split ring gear.

A rotation measurement system is shown and described herein. In some embodiments, the rotation measurement system comprises a pinion gear comprising an elastic material allowing the pinion gear to deform. The elastic deformation of the pinion gear provides a complete mesh such that there is no backlash between the pinion gear and a main gear when the pinion gear is pressed into the main gear. The pinion gear may be held in place with at least one spring pressing the pinion gear into the main gear. A sensor for measuring the rotation of the pinion gear may be decoupled from the pinion gear assembly by utilizing a Hall effect sensor to detect a magnetic field of a magnet disposed on a shaft coupled to the pinion gear.

A worm gear drive mechanism (1) having a housing (8), a rotatably mounted worm gear (4) and a worm shaft (2) rotatably mounted at at least one bearing point (7), wherein the bearing point (7) has a displacement element (10) for displacing the axial spacing (17) between the gear axis of rotation (6) of the worm gear (4) and the shaft axis of rotation (5) of the worm shaft (2).

A scissor gear assembly 31 has a main gear 33 and auxiliary gear 35 concentric to the main gear and in axial direction near the main gear. Further the assembly has planar annular springs 37 being interrupted at one place. At the interruption the springs have two ends 37a and 37b. The springs are present between both gears and are with one end 37a connected to the main gear 33 and with the other end 37b to the auxiliary gear 35, so that both gears are connected to each other in rotation direction via the springs. The springs 37 are completely placed radial outwards of the rotation axis 34 of the main gear 33 so space is created to assemble multiple springs. The solution is special suited for relative large size scissor gears.

A housing for a plastic gearbox and associated plastic gearbox and a robot. The housing includes a body including an inner engaging portion circumferentially arranged on an inner surface of the body, the inner engaging portion adapted to be engaged with a transmission assembly of the plastic gearbox; and an adjusting mechanism arranged around the body and operable to squeeze the body inwardly to reduce an inner diameter of the body. By using the adjusting mechanism to squeeze the body of the housing inwardly, the fit error between the inner engaging portion and the transmission assembly can be compensated in an efficient way. Furthermore, the adjusting mechanism is a part of the housing and thus the body of the housing which is made of plastic does not need to be too thick, which makes injection molding easier and manufacturing precision improved.

A roller gear cam mechanism is equipped with a cam and a rotating member along the outer circumferential direction of which multiple bearings are arranged. The bearings are equipped with a shaft member and an outer ring portion capable of rotating around the shaft member. The outer circumferential surface of the outer ring portion has an arc shape, and in a cross section of the cam that includes the cam axis line, a contact portion of a cam rib making contact with the outer circumferential surface of the outer ring portion has an arc shape. The arc shape of the outer ring portion is formed so as to conform to the arc shape of the cam rib. The radius of curvature of the arc of the outer ring portion and the radius of curvature of the arc of the cam rib are determined in association with each other.

A door drive for a motor vehicle door or motor vehicle flap, which is provided with an electromotive drive, a transmission downstream of the drive, and a force-transmission element. The force-transmission element is operatively connected to a leaf of the motor vehicle door or motor vehicle flap. An output element of the transmission and the force-transmission element are coupled by a toothing with compensation for play. According to the invention, the output element and/or the force-transmission element are not only designed to be moveable for play compensation, but can also be permanently fixed after the compensation for play.