Abstract: A planet-carrier includes first and second cylindrical discs which are arranged coaxially with respect to a common axis of rotation and which face toward one another with their respective basal surfaces. The first and second discs have several axial outer bores and the outer bores extend parallel to the axis of rotation. The outer bores of the first and second discs are aligned with one another, and have been designed to accommodate planetary bearings for supporting the planetary gears or for supporting planetary axles. Further, spacing elements, which take the form of elements separate from the first and second discs and which are in contact with the first and second discs, are provided between the first and second discs. The spacing elements have been designed to maintain a defined spacing between the first and second discs.

Abstract: A planet carrier includes a cylindrical disc-shaped body having a cylindrical outer surface and a cylindrical inner surface, the cylindrical inner surface defining a central inner bore, and a plurality of outer bores at locations radially between the inner bore and the outer surface. Each of the outer bores is configured to receive a planet bearing or to form an outer ring of a planet bearing. Also, at least one inner lubricating passage extends from the cylindrical inner surface to each of the outer bores, and/or at least one outer lubricating passage extends from the outer cylindrical surface to each of the outer bores.

Abstract: An electrical machine, in particular for use in a hybrid or fully electrical power train of a motor vehicle includes a stator and a rotor coaxially and rotatably arranged therein; a balancing disk for receiving and/or removing at least one balancing mass arranged on the rotor for conjoint rotation therewith, the balancing disk rotating in a radial plane of the rotor and being impinged by cooling fluid that is conducted radially outwards along at least one face under the effect of centrifugal force when the balancing disk rotates. On its face, the balancing disk includes a first fluid conducting element which runs radially more and more outwards in the axial direction out of the balancing disk such that the cooling fluid can be directed from the balancing disk toward the stator at an angle ? relative to the radial plane when the balancing disk rotates.

Abstract: A constant velocity joint includes an outer part having a connecting portion and an opening portion and a plurality of axial grooves forming outer raceways, and an inner part having a plurality of axial grooves forming inner raceways. Each outer raceway and inner raceway form a raceway pair, a ball being disposed in each raceway pair. Each raceway pair defines a region in axial cross-section with respect to a groove longitudinal axis conceptually divided into four quadrants. The outer raceway is in the first and second quadrants and the inner raceway is in the third and fourth quadrants. With torque transmission in a first direction, the ball has two contact points in the first quadrant and/or two contact points in the third quadrant, and with torque transmission in a second direction, the ball has two contact points in the second quadrant and/or two contact points in the fourth quadrant.

Abstract: A planetary gear unit includes a first ring gear having toothing and a second ring gear having toothing and at least four double planets each having a first gear wheel having toothing and a second gear wheel having toothing, the first gear wheel and the second gear wheel of each double planet being disposed so as to be rotatable about a common shaft. The toothing of each first gear wheel engages in the toothing of the first ring gear, and the toothing of each second gear wheel engages in the toothing of the second ring gear. A number and a size of the double planets is selected such that a predetermined size of an interior space in a center of the planetary gear unit, a predetermined torsional stiffness of the planetary gear unit and/or a predetermined load-bearing capability of the planetary gear unit is provided.

Abstract: A shaft-and-gear arrangement includes a shaft having a longitudinal axis of rotation, a first portion having an outer diameter, a second portion, and a third portion axially between the first portion and second portions. A first gear is formed either integrally with the second portion of the shaft or has a circumferential inner surface secured to an outer surface of the second portion of the shaft. The first gear has a first subportion having a maximum outer diameter of the first gear and a second subportion having a radially outer surface having a maximum outer diameter less than the maximum outer diameter of the first gear, and the second subportion includes a first axially facing abutment surface. The second gear also has a first subportion and a second subportion with a second axially facing abutment surface in contact with the first axially facing abutment surface.

Abstract: An angular contact ball bearing arrangement has first and second raceway elements having raceways and a plurality of balls therebetween. When viewed in cross section through one of the balls the arrangement is divided into first, second, third and fourth quadrants by an axis of rotation of one of the balls and a perpendicular axis perpendicular to the axis of rotation of the ball. Each ball has two contact points on each raceway that are offset from the perpendicular axis by #10 degrees, and the contacts points are each located in a different quadrant. Also the centre point of the radius curvature of the first raceway on one side of the perpendicular axis and the centre point of the radius of curvature of the first raceway on the other side of the perpendicular axis are in located in different quadrants.

Abstract: An electrical machine, in particular for use in a hybrid or fully electrical power train of a motor vehicle includes a stator and a rotor coaxially and rotatably arranged therein; a balancing disk for receiving and/or removing at least one balancing mass arranged on the rotor for conjoint rotation therewith, the balancing disk rotating in a radial plane of the rotor and being impinged by cooling fluid that is conducted radially outwards along at least one face under the effect of centrifugal force when the balancing disk rotates. On its face, the balancing disk includes a first fluid conducting element which runs radially more and more outwards in the axial direction out of the balancing disk such that the cooling fluid can be directed from the balancing disk toward the stator at an angle ? relative to the radial plane when the balancing disk rotates.

Abstract: A modular high precision gear box arrangement includes first and second gear boxes. The first gear box has a first rotatable hollow wheel, a second fixed hollow wheel and at least one double planet having a first planet and a second planet arranged on a planet shaft. The first planet meshes with the first hollow wheel, the second planet meshes with the second hollow wheel, and the first hollow wheel is coupled with an output. The second gear box includes a fixed hollow wheel that is the second hollow wheel of the first gear box and at least one planet that is the second planet of the at least one double planet of the first gear box. The second gear box further includes an input for driving the planet shaft, wherein the input is arranged centrically or eccentrically to a central rotation axis of the gear box arrangement.

Abstract: A bearing assembly includes first and second raceways and balls between the raceways, and is conceptually divided into four quadrants by a ball rotational axis and an axis perpendicular to the ball rotational axis. The second raceway includes a first portion lying in the first quadrant and a second portion lying in the second quadrant, and the first raceway includes a first portion lying in the third quadrant and a second portion lying in the fourth quadrant. Each of the balls has a raceway contact point in each of the quadrants, and a center of curvature of each of the portion of the raceway in each quadrant is located in an opposite quadrant. The contact points are offset from the axis perpendicular to the ball axis of rotation and are arranged in a range of ±10°, around the axis perpendicular to the ball axis of rotation.

Abstract: A modular high precision gear box arrangement includes first and second gear boxes. The first gear box has a first rotatable hollow wheel, a second fixed hollow wheel and at least one double planet having a first planet and a second planet arranged on a planet shaft. The first planet meshes with the first hollow wheel, the second planet meshes with the second hollow wheel, and the first hollow wheel is coupled with an output. The second gear box includes a fixed hollow wheel that is the second hollow wheel of the first gear box and at least one planet that is the second planet of the at least one double planet of the first gear box. The second gear box further includes an input for driving the planet shaft, wherein the input is arranged centrically or eccentrically to a central rotation axis of the gear box arrangement.

Abstract: A constant velocity joint includes an outer part having a connecting portion and an opening portion and a plurality of axial grooves forming outer raceways, and an inner part having a plurality of axial grooves forming inner raceways. Each outer raceway and inner raceway form a raceway pair, a ball being disposed in each raceway pair. Each raceway pair defines a region in axial cross-section with respect to a groove longitudinal axis conceptually divided into four quadrants. The outer raceway is in the first and second quadrants and the inner raceway is in the third and fourth quadrants. With torque transmission in a first direction, the ball has two contact points in the first quadrant and/or two contact points in the third quadrant, and with torque transmission in a second direction, the ball has two contact points in the second quadrant and/or two contact points in the fourth quadrant.

Abstract: A planetary gear is disclosed that provides at least a first hollow wheel with a helical gearing and a second hollow wheel with a helical gearing are adapted to rotate in a first rotational direction and a second opposite rotational direction, and a first double planet having a first wheel with a helical gearing meshing with the helical gearing of the first hollow wheel and having a second wheel with a helical gearing meshing with the helical gearing of the second hollow wheel. The disclosed configuration minimizes backlash between the helical gearings.

Abstract: It is disclosed a high precision gear box (1) comprising at least one lubricated unit (40, 52, 64), wherein the lubricated unit (40, 52, 64) comprises a first element (42, 54, 66) and a second element (44, 56, 68), wherein the first element (42, 54, 66) and the second element (44, 56, 68) are configured to rotate against each other, wherein a space (48, 60, 72) is formed between the first element (42, 54, 66) and the second element (44, 56, 68), wherein the space (48, 60, 72) is filled with a polymer material (50, 62, 74) being saturated with oil for lubricating the first and the second element (44, 56, 68).

Abstract: A planetary gear is disclosed that provides at least a first hollow wheel with a helical gearing and a second hollow wheel with a helical gearing are adapted to rotate in a first rotational direction and a second opposite rotational direction, and a first double planet having a first wheel with a helical gearing meshing with the helical gearing of the first hollow wheel and having a second wheel with a helical gearing meshing with the helical gearing of the second hollow wheel. The disclosed configuration minimizes backlash between the helical gearings.

Abstract: A rolling-element bearing transmission includes a rotor configured to rotate a shaft relative to a stator and a rotatable output ring that includes a first rolled-on surface element. The shaft includes at least one second rolled-on surface element, and the stator includes a third rolled-on surface element. First and second pluralities of rolling elements are located between the shaft and the stator and between the shaft and the output ring. Also, a transmission mechanism transmits a rotary motion of the shaft to the output ring with a speed reduction such that the output ring rotates at a lower speed than the shaft.

Abstract: A transmission assembly includes a sun gear including an outer set of gear teeth, a planet carrier disposed around the sun gear, and a ring gear surrounding the planet carrier and the sun gear and including an inner set of gear teeth. At least one double planet is attached to the planet carrier. The double planet includes a first set of gear teeth and a second set of gear teeth, the outer set of gear teeth of the sun gear meshes with the first set of gear teeth, and the second set of gear teeth meshes with the inner set of gear teeth of the ring gear.

Abstract: A planetary transmission includes first and second ring gears and a double planet with first and second gears rotatably disposed about a common shaft and arranged such that the gear teeth of the first gear of the double planet engage into the gear teeth of the first ring gear, and the gear teeth of the second gear of the double planet engage into the gear teeth of the second ring gear. The first gear of the double planet is preloaded in a clockwise direction such that the gear teeth of the first gear of the double planet are in contact with the gear teeth of the first ring gear, and the second gear of the double planet is preloaded in a counterclockwise direction such that the gear teeth of the second gear of the double planet are in contact with the gear teeth of the second ring gear.

Abstract: A bearing assembly for rotatably supporting a first carrier element on a second carrier element includes first and second parts, each having a through-bore, configured to rotate about a common axis, and a first fastener for attaching the first part to the first carrier element and a second fastener for attaching the second part to the second carrier element. The first and the second through-bores are aligned with each other, and the second fastener is configured to pass entirely through the first through-bore into the second through-bore and engage an interior of the second through-bore to fasten the second part to the second carrier element. The first fastener is too large to pass entirely through the first through-bore and is configured to engage an interior of the first through-bore to fasten the first part to the first carrier element.

Abstract: A transmission assembly includes a sun gear including an outer set of gear teeth, a planet carrier disposed around the sun gear, and a ring gear surrounding the planet carrier and the sun gear and including an inner set of gear teeth. At least one double planet is attached to the planet carrier. The double planet includes a first set of gear teeth and a second set of gear teeth, the outer set of gear teeth of the sun gear meshes with the first set of gear teeth, and the second set of gear teeth meshes with the inner set of gear teeth of the ring gear.