In a combination of a sprocket arrangement (128) and a saw chain (16), a sprocket tooth spacing (TI) between consecutive sprocket teeth (40) relates to a drive link spacing between consecutive drive links (30) of the saw chain (16) such that the guide teeth (42) of two or more drive links (30) may enter between a pair of consecutive sprocket teeth (40).

A chain drive unit (4, 5, 6) for reducing chain vibrations comprising a chain wheel unit (43) with at least two sprockets (431, 432) that are arranged parallel on a common rotation axle, at least two parallel chains (51, 52) engaging these sprockets (431, 432). At least one damping element (6) connecting two adjoining chains (51, 52). The circumferential orientation of two adjoining sprockets (431, 432) differs by a partial pitch (pP) and the damping element (6) comprises a first fixation (61) on its one free end for the lateral fixation to the first chain (51), a second fixation (62) on its opposite free end for the lateral fixation to the second chain (52) and a force transmission unit (63, 8, 9) arranged between the first and the second fixation transmitting an applied force from the first fixation (61) to the second fixation (62) and vice versa.

A chainring for a bicycle includes a body and a plurality. The plurality of teeth are disposed about a periphery of the body. The plurality of teeth have a tooth body formed of a first material and include a load flank. The plurality of teeth also include an insert formed of a second material. The insert is coupled to a tooth body of the plurality of teeth forming a load flank surface of the plurality of teeth.

A chainring includes a first section having consecutive first teeth. Each of the first teeth includes a first load flank surface having a first wear resistance. The chainring also includes a second section coupled to the first section. The second section includes consecutive second teeth. Each of the second teeth includes a second load flank surface having a second wear resistance greater than the first wear resistance. The consecutive second teeth span an arc length corresponding to between one twelfth and one third of a circumference of a pitch circle of the chainring.

The problem of progressive deforming of the silencing rubber by the motion transmission member (chain) is present in silenced sprockets. In particular for a toothed crown, lacking a central hub, the problem of the deforming or lowering of the rubber hasn't been resolved adequately. In the case of a pinion with a hub, an excessive quantity of rubber is used. The silenced sprocket of the present invention comprises, adjacent to the base of its teeth (105), a circular channel, or bilateral channel (200), on the metal body of the sprocket itself. On the inner circular step (110) of the channel (200) are discharged the forces created in the rubber by the transmission chain. The bilateral channel has a minimal radial extension, such as about cm in the motorcycle field. In general the silencing rubber element (106) and the bilateral channel (200), which creates its housing, have a minimal radial extension compared to the sprocket radius. The invention also comprises a molding technique that uses special molding components (107a, 107b), adapted to apply the rubber silencing element on the sprocket metal body. These components are of annular circular shape, U cross section and a width essentially corresponding to the channel (200) width, rendering the mold independent from the specific shape of the sprocket metal

A roller chain sprocket includes a body with a hub and a row of teeth that extends circumferentially around the hub such that the hub extends axially outward on opposite first and second sides of the row of teeth. The teeth are separated from each other by tooth spaces, wherein each of said tooth spaces is bisected by a radial tooth space centerline. First and second elastomeric cushion rings are respectively bonded to the hub on the opposite first and second sides of the row of teeth, with cushion ring extending circumferentially about the hub and including a plurality of compression pads separated from each other by axially extending transverse grooves. Each of the compression pads includes a planar or otherwise flat outer surface that is connected to a respective preceding one of the grooves by a leading corner surface and connected to a respective trailing one of the grooves by a trailing corner surface. Each of the grooves is located radially inward from a respective associated one of the tooth spaces such that the tooth space centerline is circumferentially aligned with the trailing corner surface that connects the groove to a preceding one of the compression pads. The compression pads provide both primary compression for a meshing chain link row and secondary compression for the next-meshing, upstream chain link row.

A driving force transmission system for an engine is provided with a crank sprocket mounted on a crankshaft, cam sprockets mounted on camshafts, an intermediate shaft disposed between the crankshaft and the camshafts, a dual sprocket mounted on the intermediate shaft, and including a first sprocket and a second sprocket facing each other in a state that the first and second sprockets are rotatable relative to each other, a first endless transmission member wound around the crank sprocket and the first sprocket, and a second endless transmission member wound around the cam sprocket and the second sprocket. The dual sprocket includes a damping portion for connecting the first and second sprockets. The damping portion is configured to exert a resilient force in a rotational direction of the first and second sprockets.

An electric taxi system (ETS) for an aircraft includes rollers attached circumferentially to a wheel of the aircraft, and a sprocket with circumferentially distributed teeth attached to a sprocket-tooth ring. The sprocket has a hub with an axis of rotation that is parallel to an axis of rotation of the wheel of the aircraft. The sprocket includes a flexible member interposed between the hub and the sprocket-tooth ring. A radial axis of at least one tooth of the sprocket is substantially perpendicular with an axis of rotation of at least one of the rollers even if the at least one of the rollers is non-parallel to the axis of rotation of the wheel of the aircraft.

To provide a sprocket that not only reduces impact and hitting noise caused by contact and seating of a chain when it meshes with the sprocket, but also simplifies a setting of process conditions for securing a cushion ring on a side face of a sprocket body. The sprocket includes the sprocket body formed with a plurality of teeth on a circumferential surface thereof, and the cushion ring provided to at least one side face of the sprocket body and having an outer circumferential surface that makes contact with link plates of a chain. The cushion ring is secured to the sprocket body without an adhesive layer.

A damping ring assembly may include a plurality of damping members, each of the damping members including an arc length, a radial thickness, a plurality of recesses located on an end surface and a retention groove on an outer surface of the damping members. A damping ring assembly may also include a plurality of brackets for attaching the plurality of damping members to a circumferential surface of a drive sprocket, the plurality of brackets each including a radially inner leg, a radially outer leg, and a joining central portion that connects the radially inner leg and the radially outer leg.