A torque transmission apparatus having a shift collar and a drive component. The shift collar may have a collar gear that may have a collar tooth that may have a concave collar tooth side surface that may be centered about a transverse collar tooth plane. The drive component may have a tooth that may have a convex lateral side surface centered about a transverse tooth plane. The concave collar tooth side surface may cooperate with the convex lateral side surface to align the transverse collar tooth plane with the transverse tooth plane.

A resin helical gear is formed by setting a first machining reference line obliquely coupling a tooth tip side of a first tooth to a tooth root side of a second tooth on another end side in the tooth width direction along a tooth surface, and a second machining reference line obliquely coupling a tooth tip side of the second tooth to a tooth root side of the first tooth along the tooth surface. Then, the tooth surface is cut out from the first machining reference line to the tooth root of the first tooth while the tooth surface is cut out from the second machining reference line to the tooth root of the second tooth. Then, an involute tooth profile form is left on a tooth tip side of the tooth with respect to the first machining reference line and the second machining reference line.

It belongs to the technical field of slowdown in joints, and more particularly relates to a thickened robot joint transmission structure. The thickened robot joint transmission structure comprises a shell, dual gear rings and a planet carrier, wherein the planet carrier is fixed to the shell through a crossed roller bearing. Planet gears are dual thickened planet gears free of a sun gear. The input ends are a pair of gears or spiral bevel gears with a variable velocity ratio and are fixed to the shell through deep groove ball bearings. The dual thickened planet gears serve as a hollow for a cable, a related shaft or a line object to pass through after the sun gear is removed.

A gear drive device includes a first gear, a second gear that meshes with the first gear to allow torque transmission, and a biasing member that applies rotational torque in one direction to the first gear or the second gear. The first gear and the second gear are brought into contact at a contacting tooth surface thereof by the biasing member. At least one of the first gear and the second gear includes a non-contacting tooth surface that is on an opposite side of the contacting tooth surface and partially removed.

A multi-slot gear for a powertrain of a vehicle includes an inner ring, an outer ring having gear teeth disposed on a periphery of the outer ring, a web disposed between the inner ring and the outer ring, and a plurality of slots disposed within the web. Each of the plurality of slots includes a slot angle and each of the plurality of slots is separated from one another by a space angle. The ratio of the slot angle to the space angle is greater than two.

A torque transfer device has plural planets arranged for planetary rotation about one or more sun gears and within one or more ring gears. Each planet includes at least one planetary gear set comprising plural planetary gears connected to rotate together, but having a different diameter to form a differential gear system. To improve load sharing, the plural planetary gears of each planetary gear set may have a different helical angle, the plural planetary gear sets being axially movable with respect to one another. Alternatively or in addition, the planetary gears may be made flexible with respect to radial forces.

A tooth of a pinion has a first flank extending across a face width of the tooth in an axial direction substantially parallel to a central axis of the pinion from a first axial end of the tooth to a second axial end of the tooth. The first flank has a first, convex crown profile shaped as an arc of a first circle with a first radius, and a first center of arc radius of the first flank is a point on the first flank located on a line perpendicular to the central axis of the pinion and passing through the center of the first circle. A second opposite and opposing flank of the tooth has a second, convex crown profile shaped as an arc of a second circle with a second radius, wherein a second center of arc radius of the second flank is a point on the second flank located on a line perpendicular to the central axis of the pinion and passing through the center of the second circle. The first center of arc radius of the first flank is located at approximately the midpoint of the face width of the tooth, and the second center of arc radius of the second flank is offset in the axial direction toward one of the first or second axial ends of the tooth relative to the first center of arc radius by a distance that is approximately 30-40% of the face width of the tooth.

A plastic helical gear has a three-dimensional tooth surface modification section on a tooth surface of each of involute-shaped teeth. The three-dimensional tooth surface modification section is a combined surface of a tooth top modification surface and an arc crowning surface. The tooth top modification surface is gradually reduced in tooth thickness from a position between a tooth top and a tooth root toward the tooth top. The arc crowning surface is gradually reduced in tooth thickness from a position between one end in the tooth width direction and the other end in the tooth width direction toward both ends in the tooth width direction. A line extending from an intersection point P0 between the starting position of the tooth top modification surface and the apex position of the arc crowning surface to the tooth root is aligned with a line on the tooth surface of the involute-shaped tooth.

A gear for transmitting power has a plurality of teeth, each having two tooth flanks for transmitting power to another gear. The gear can be rotated about an axis of rotation, and has a reference plane, which is arranged orthogonal to the axis of rotation. Tooth flanks of the same name are the tooth flanks for transmitting power in one direction of rotation, wherein the tooth flanks have a tooth flank length proceeding from a front side of the reference plane. Two tooth flanks of the same name are arranged directly adjacent to a crown tooth flank, said two tooth flanks of the same name each having a smaller tooth flank length than the crown tooth flank. The gear has at least one of the crown tooth flanks and is configured as a helically toothed gear.

A low-cost railway vehicle gear device of parallel cardan drive system is provided in which the vibrations and noises can be reduced only by means of 2-D tooth surface modifications. In a railway vehicle gear device of parallel cardan drive system having a helical pinion (1) and a helical gear wheel (2), a pinion and a gear wheel respectively having gear specifications of module of 4 to 8, pressure angle of 20 to 30?, and helix angle of 15 to 30?, crowning is performed on a gear surface in the flank line direction of the pinion. The tooth surface (11) has a shape of a sinusoidal curve with an apex (11a) being positioned in a central area of the face width direction of the pinion, the sinusoidal curve being expressed by a single sinusoidal function and extending over an entire width in the face width direction of the helical pinion.