A gear motor of an electrical assistance device for a cycle is provided, including a gear reducer and an electric motor, which are configured to be fitted coaxially on a central shaft, the gear reducer including at least one planet wheel, which is fitted firstly on an eccentric cam, the planet wheel also having passing therethrough at least three shafts of the satellite-carrier, the at least three shafts including a respective peripheral surface configured to come into contact with a hole of the planet wheel, which surface is made of polymer material, and/or the at least one planet wheel is made of polymer material.

A rotary damper device includes a drive component and a rotary damper upstream of the drive component. The drive component has an input gear with an external toothing and axially open cut-outs. The rotary damper has an annular carrier, a spring element arranged in the annular carrier, an output gear with an internal toothing meshed with the external toothing, and a clamping ring with a plurality of axially extending fingers engaged in the axially open cut-outs to clamp the output gear against the input gear.

A torsional vibration damper arrangement for a drive train of a motor vehicle includes a torsional vibration damper having an input flange, a first output flange, a second output flange, a hub, a first connecting element, and a second connecting element. The first output flange is rotatable relative to the input flange about an axis of rotation against a spring device. The first connecting element lies on a first radius relative to the axis of rotation and connects the first output flange, the second output flange, and the hub in rotationally fixed and form-fitting or force-fitting manner for torque transmission to a further component. The second connecting element is disposed at least partially radially inside the hub and connects the hub to the second output flange in a force-fitting or form-fitting manner.

A device includes a cylinder sleeve (3, 13), which is at least indirectly arranged at a housing (7) and at least three radially outward extending journals (5). Each journal (5) comes to rest, at least on one side, against a roller element (6a, 6b) accommodated at the housing (7) in order to support the cylinder sleeve (3, 13) on the housing (7) in at least one tangential direction. The device can be designed, in particular, as a planetary transmission or as an electric machine.

Gear devices and methods for operating gear devices are provided. In one example, a gear device is provided that comprises structures designed to attenuate targeted vibrations occurring during rotation of the gear device. The structures includes radially aligned struts extending between an inner carrier and an outer carrier, a plurality of openings arranged between the struts, and/or resonators extending between sequential struts.

A gas turbine engine according to an example of the present disclosure includes, among other things, a propulsor section including a propulsor, a gear reduction, a first spool including a first compressor, a first turbine and a first shaft, and a second spool including a second compressor, a second turbine and a second shaft. The gear reduction includes a carrier and a plurality of gears. The plurality of gears include a sun gear, a ring gear, and a plurality of intermediate gears that engage the sun gear and the ring gear. At least two of the plurality of gears are double helical gears in meshed engagement.

The present invention relates to a reducer (10) comprising: a hollow input shaft (100) having a driving surface (110) therein; an output shaft (200) which is accommodated inside the input shaft (100) and having an output shaft body (210) having an output shaft gear (220) formed along the circumferential direction on the outer surface; a plurality of rollers (R) aligned between the output shaft (200) and the driving surface (110) and extending in the axial direction; and ring-shaped caps (300) positioned on both sides of the axial direction of the rollers (R), wherein the rollers (R) are guided to move in the radial direction by means of the caps (300) and, when the input shaft (100) rotates, the rollers (R) are pressurized against the driving surface (110) to pressurize the output shaft gear (200), so that the output shaft (200) rotates.

A drive transmission device according to one embodiment of the disclosure includes: an arm having a motor that generates a rotational force; a speed reducer that is provided in the arm and has a carrier for decelerating rotation of the motor and outputting the decelerated rotation; a bucket fixed to the carrier by a reamer bolt, the reamer bolt being inserted in a bracket through hole formed in the bucket; and a resin bush provided between an internal surface of the bracket through hole and an external lateral surface of the reamer bolt. The mechanical strength of the resin bush is lower than the mechanical strength of the bucket and the mechanical strength of the reamer bolt.

A gearbox includes a sun gear, a plurality of planetary gears meshed with the sun gear, a rotating frame supporting the planetary gears, and a housing with an internal ring gear meshed with the planetary gears. The planetary gears include a first gear and a second gear coaxially connected to each other along an axial direction and rotating synchronously, the first gear meshed with the sun gear, and the second gear meshed with the internal ring gear of the housing. The rotating frame received in the housing has an upper frame and a lower frame with a central hole, each of the plurality of planetary gears is arranged between the upper frame and the lower frame by a mounting pin, the lower frame is supported by a flange connected to the housing, the sun gear is driven to rotate so as to operate the rotating frame. The gearbox of the present disclosure has low vibration and low noise.

Embodiments of the invention are shown in the figures, where a method is presented for designing a component, including designing or receiving a model of the component; determining at least one mode shape of at least a portion of the model; redesigning the model based on the determined at least one mode shape to obtain a redesigned model of the component; and manufacturing the component in accordance with the redesigned model.