A gear rim carrier part for a two- or multi-component gearwheel includes an annular section which revolves around an axis of rotation in the circumferential direction, a gear rim arranged radially on the outside of the annular section, and a projection which extends radially inwards from the annular section and has a radially inner free end, or the gear rim carrier part includes an annular section which revolves around an axis of rotation in the circumferential direction, a gear rim arranged radially on the inside of the annular section, and a projection which extends radially outwards from the annular section and has a radially outer free end.

The projection has a first width at the radially inner free end thereof or at the radially outer free end thereof and has a second width at the opposite end thereof at the transition to the annular section.

A ring gear (100) for a planetary transmission includes a gear ring (110) formed with an internal gearing (120) on an inner circumferential surface of the gear ring (110). The gear ring (110) also includes a radially projecting and unilaterally axially overhung flange (130) on an outer circumferential surface of the gear ring (110). The flange (130) is formed with a circumferential collar (131) and a collar overhang (132). The collar overhang (132) has a crown gearing (140). The crown gearing (140) is continuous and axially extends through the collar (131).

A ring gear that, together with a sun gear and a pinion gear that is disposed radially outward of the sun gear and meshes with the sun gear, forms a planetary gear unit, the ring gear includes: a body, internal teeth that are configured to mesh with the pinion gear and that are formed in at least a part of an inner peripheral surface of the body, and external teeth that have a lower hardness than the internal teeth and that are formed in at least a part of an outer peripheral surface of the body, wherein a surface nitrogen concentration in the internal teeth is higher than that in at least tooth surfaces of the external teeth.

A planetary reduction gear ring gear for a turbine engine, in particular of an aircraft, the ring gear extending about an axis (X) and including first and second coaxial annular elements and respectively two inner annular teeth oriented differently. The first and second annular elements include respectively first and second radially external annular flanges to secure the first and second elements to one another, the teeth of the first and second annular elements being axially spaced from one another and from a joint plane (P) of the first and second flanges, and defining between them an annular space externally delimited by two annular rims supporting respectively the flanges. At least one of the flanges includes joint plane notches that are substantially radial for the oil to pass through by centrifugation. The ring gear further includes an annular row of oil-retention walls protruding from the rims in the space.

A method for aligning toothing in an assembly of two half-ring gears is provided: an angular positioning pin is provided which is to be received in respective holes of the half-ring gears; the holes are drilled on the first half-ring gear such that the first hole has a first cross-section that is smaller than the final cross-section thereof; the angles between the teeth are compared between the two half-ring gears, and an angular difference between said angles of the half-ring gears is deduced therefrom; the first hole is redrilled to the final cross-section, while the centre of the hole is angularly shifted by the value of the angular difference; the pin is engaged in the holes, and the half-ring gears are then assembled using an interference fit.

A planetary gear mechanism includes a plurality of planetary gear units each including a sun gear member to be rotationally driven by a driving source, an internal gear member, planetary gear members, and a carrier member, and a case body that internally houses the planetary gear units and includes an inner circumferential surface to be brought into surface contact with outer circumferential surfaces of the internal gear members. Engagement portions having concave shapes or convex shapes that can be fitted to convex shapes or concave shapes formed in the outer circumferential surfaces of the internal gear members are formed in the inner circumferential surface of the case body. The engagement portions are engaged with the convex shapes provided in the outer circumferential surfaces of the internal gear members, from an opposite direction to a rotating direction of the carrier members, to thereby inhibit the internal gear members from rotating.

A method of manufacturing a mechanical part of the present invention includes a first process of forming, by performing a folding processing to an end portion of the material, a portion to be processed having a structure, in which a plurality of layers respectively having a thickness corresponding to a plate thickness of a material overlap each other, in the material such that a plate thickness direction of the layer is orthogonal to a plate thickness direction of the material; and a second process of changing, by performing a forging processing to the portion to be processed, a shape of the portion to be processed to a target shape while press-welding the layers of the portion to be processed to each other by plastic deformation.

A ring gear for an epicyclic or planetary reduction gear of a turbomachine, in particular of an aircraft, said ring gear extending about an axis X and comprising first and second coaxial annular elements and comprising, respectively, two inner annular toothing sets of different orientation, each of said toothing sets having a pitch diameter and a median plane substantially perpendicular to said axis and with an intersection point designated Y in an axial cross-section of the ring gear, said first and second annular elements further comprising, respectively, first and second radially outer annular flanges for attaching said first and second elements to each other, wherein each of said first and second flanges comprises a peripheral portion extending in a plane that is angled with respect to said axis X and that passes substantially through said intersection point Y.

A drive unit assembly. The drive unit assembly includes one or more first motors drivingly connected to at least a first end portion of a first shaft. A planetary gear assembly having a sun gear, one or more planetary gears, a ring gear and a carrier. At least a portion of the sun gear is drivingly connected to at least a portion of a second end portion of the first shaft and the carrier is drivingly connected to at least a portion of the one or more planetary gears. A differential input member is drivingly connected to at least a portion of the carrier and a differential assembly. At least a portion of a first axle half shaft is drivingly connected to the differential and is disposed within a hollow portion of said first shaft and a second axle half shaft is drivingly connected to the differential assembly.

A dynamic imbalanced force generator includes a pair of eccentric masses and a shaft frame. The generator further includes at least one support plate of a motor arranged radially with respect to the shaft frame, and a gear system. A second imbalance is arranged between a first imbalance and the shaft frame, and coaxially with respect to the first imbalance. At least one motor is supported by the plate and engaged with at least one of the first and second imbalances by the gear system. The support plate and the motor are arranged between the imbalances and the shaft frame.