A bicycle sprocket assembly comprises a sprocket support member. The sprocket support member comprises a central cylindrical portion and a plurality of sprocket support portions. The plurality of sprocket support portions extends radially outwardly from the central cylindrical portion with respect to a rotational center axis of the bicycle sprocket assembly. At least one sprocket support portion of the plurality of sprocket support portions comprises at least one radially extending surface, at least one axially extending surface, and an interior cavity. The at least one radially extending surface extends radially relative to the rotational center axis to support at least one of the at least one sprocket. The at least one axially extending surface extends in an axial direction parallel to the rotational center axis.

An apparatus includes a non-metal high torque sprocket and non-metal bushing. The non-metal high torque sprocket includes a body defining an outer periphery and a hub section defining an inner surface for engaging a bushing, a continuous toothed structure disposed on the outer periphery of the body, and a textile reinforcement embedded in the body adjacent the inner surface of the hub section, wherein the body is formed of a castable polymer material. The hub section inner surface is a tapered shape, and is adapted to engage a conventional QD bushing or a taper-lock bushing. The non-metal bushing is engageable by the hub section inner surface of the high torque sprocket. The non-metal bushing may be formed of a castable polymer material, which may optionally include ultra-high molecular weight powder. According to some embodiments, the non-metal bushing is a QD bushing.

An apparatus includes a non-metal high torque sprocket and non-metal bushing. The non-metal high torque sprocket includes a body defining an outer periphery and a hub section defining an inner surface for engaging a bushing, a continuous toothed structure disposed on the outer periphery of the body, and a textile reinforcement embedded in the body adjacent the inner surface of the hub section, wherein the body is formed of a castable polymer material. The hub section inner surface is a tapered shape, and is adapted to engage a conventional QD bushing or a taper-lock bushing. The non-metal bushing is engageable by the hub section inner surface of the high torque sprocket. The non-metal bushing may be formed of a castable polymer material, which may optionally include ultra-high molecular weight powder. According to some embodiments, the non-metal bushing is a QD bushing.

A toothed belt pulley for a toothed belt drive of a motor vehicle steering system, having a gear ring which has an externally encircling toothing and is attached to a hub body. The gear ring is formed as a plastically formed metallic formed part and the hub body comprises a plastics-material part.

In a torsional damper, a damper mass is connected to a hub through a damper rubber. The hub is provided with a boss fixed to a crankshaft and a rim holding the damper rubber. The boss and the rim are coupled by plurality of spokes. The plurality of spokes each has an inclined shape inclined in the axial direction. Reinforcement portion is provided in the spokes in one direction corresponding to a bending vibration to be input among the plurality of spokes.

In a torsional damper, a damper mass is connected to a hub through a damper rubber. The hub is provided with a boss fixed to a crankshaft and a rim holding the damper rubber. The boss and the rim are coupled by plurality of spokes. The plurality of spokes each has an inclined shape inclined in the axial direction. Reinforcement portion is provided in the spokes in one direction corresponding to a bending vibration to be input among the plurality of spokes.

A stepless transmission transmits a driving force by an endless transmission member (5) wound around a V-groove (6) of an input pulley (1). The input pulley (1) has moving parts (9) which are fastened by threaded engagement so as to be axially movable with respect to a transmission case (3) and have ring gears (10), to which rotation can be input from the outer periphery sides, and pulley half discs (13) which are relatively rotatable with respect to the moving parts (9), which axially move integrally with the moving parts (9) and which are contactable with an endless transmission member (5). The pulley half discs (13) and an input shaft 2, which is disposed at the center of the pulley half discs (13), rotate together as one piece. The ring gears (10) are each rotationally driven from a drive source of the same drive member.

A stepless transmission transmits a driving force by an endless transmission member (5) wound around a V-groove (6) of an input pulley (1). The input pulley (1) has moving parts (9) which are fastened by threaded engagement so as to be axially movable with respect to a transmission case (3) and have ring gears (10), to which rotation can be input from the outer periphery sides, and pulley half discs (13) which are relatively rotatable with respect to the moving parts (9), which axially move integrally with the moving parts (9) and which are contactable with an endless transmission member (5). The pulley half discs (13) and an input shaft 2, which is disposed at the center of the pulley half discs (13), rotate together as one piece. The ring gears (10) are each rotationally driven from a drive source of the same drive member.

A resin gear includes a web with a side surface on which a first annular rib and a second annular rib are formed to be concentric with a boss. The web has an inner web portion coupling the first annular rib to the second annular rib, and an outer web portion coupling the second annular rib to a rim. The inner web portion is formed to have a thickness gradually reduced from one intersection point toward another intersection point, the intersection points being intersection points of a virtual radial direction line passing through a center of the boss with the second annular rib. The first annular rib has a side surface on which only one gate mark of an injection molding is formed at a position on a radially outer side with respect to a first tooth portion and a position biased to the other intersection point on the virtual radial direction line.

Filtering pullies with a hub adapted to be fixed to a rotating shaft, a crown mounted coaxially and rotationally free on the hub, at least one elastic group arranged circumferentially with respect to the hub and the crown and interposed, each, between a pair of first elements integral with the hub and between a pair of second elements integral with the crown are disclosed. The pulley has a dust protection system configured to isolate the at least one elastic group with respect to the external environment and to provide an axial force generating a damping to the movement between the hub and the crown.