A sprocket system including a sprocket assembled from multiple disc sprockets coaxially aligned and secured together to provide a desired axial width for the sprocket is described. In some embodiments, the sprocket described herein is a hub-less sprocket.

A bicycle rear wheel sprocket arrangement which is rotatable about a common sprocket rotation axis that defines an axial direction and orthogonal to which are radial directions, comprising a plurality of sprockets of different sizes and number of teeth arranged coaxially along the sprocket rotation axis, which are connected to one another such that the sprockets jointly rotate about the sprocket rotation axis together, wherein the sprocket arrangement comprises a first partial arrangement that includes a largest sprocket, and a second partial arrangement that includes a plurality of sprockets formed integrally with one another. One partial arrangement has a plurality of elastically deformable latching formations that are in latching engagement with a plurality of mating latching formations of the other partial arrangement to prevent the two partial arrangements from separating in the axial direction.

A bicycle rear wheel sprocket arrangement which is rotatable about a common sprocket rotation axis that defines an axial direction and orthogonal to which are radial directions, comprising a plurality of sprockets of different sizes and number of teeth arranged coaxially along the sprocket rotation axis, which are connected to one another such that the sprockets jointly rotate about the sprocket rotation axis together, wherein the sprocket arrangement comprises a first partial arrangement that includes a largest sprocket, and a second partial arrangement that includes a plurality of sprockets formed integrally with one another. One partial arrangement has a plurality of elastically deformable latching formations that are in latching engagement with a plurality of mating latching formations of the other partial arrangement to prevent the two partial arrangements from separating in the axial direction.

A bicycle sprocket has a plurality of teeth arranged one after the other along a circumferential direction and a plurality of spaces each of which being arranged between two of said teeth. Said plurality of teeth includes at least one first gearshifting tooth and at least one second tooth arranged immediately downstream of said at least one first gearshifting tooth with reference to a rotation direction (R) of the sprocket during pedaling. Said plurality of spaces includes at least one first space defined between said at least one first gearshifting tooth and said at least one second tooth and having a predetermined circumferential extension and at least one second space arranged downstream of said at least one second tooth with reference to said rotation direction (R) and having a circumferential extension greater than that of said at least one first space.

A bicycle sprocket has a plurality of teeth arranged one after the other along a circumferential direction and a plurality of spaces each of which being arranged between two of said teeth. Said plurality of teeth includes at least one first gearshifting tooth and at least one second tooth arranged immediately downstream of said at least one first gearshifting tooth with reference to a rotation direction (R) of the sprocket during pedaling. Said plurality of spaces includes at least one first space defined between said at least one first gearshifting tooth and said at least one second tooth and having a predetermined circumferential extension and at least one second space arranged downstream of said at least one second tooth with reference to said rotation direction (R) and having a circumferential extension greater than that of said at least one first space.

A torsionally compliant sprocket system includes a first sprocket (250); a second sprocket (230) mounted in side-by-side relation to the first sprocket (250); a resilient member (270) that resiliently couples the second sprocket (230) to the first sprocket (250) to allow limited angular rotation of the second sprocket (230) with respect to the first sprocket (250); and a locking structure (300, 600, 700) that is biased toward an engaged position in which angular motion of the second sprocket (230) with respect to the first sprocket (250) is restrained and moves in response to rotation of the first sprocket (250) to a disengaged position in which angular motion of the second sprocket (230) with respect to the first sprocket (250) is permitted.

A torsionally compliant sprocket system includes a first sprocket (250); a second sprocket (230) mounted in side-by-side relation to the first sprocket (250); a resilient member (270) that resiliently couples the second sprocket (230) to the first sprocket (250) to allow limited angular rotation of the second sprocket (230) with respect to the first sprocket (250); and a locking structure (300, 600, 700) that is biased toward an engaged position in which angular motion of the second sprocket (230) with respect to the first sprocket (250) is restrained and moves in response to rotation of the first sprocket (250) to a disengaged position in which angular motion of the second sprocket (230) with respect to the first sprocket (250) is permitted.

A laminated sprocket assembly is provided formed of a plurality of layers that are connected together. Each of the layers is a stamped sheet metal layer having a plurality of spaced apart teeth located around a periphery thereof. The teeth in the plurality of connected layers are aligned. At least one of voids, channels, openings, or recesses are located in or between at least some of the layers for receiving and holding lubricating oil. This reduces noise and wear.

A laminated sprocket assembly is provided formed of a plurality of layers that are connected together. Each of the layers is a stamped sheet metal layer having a plurality of spaced apart teeth located around a periphery thereof. The teeth in the plurality of connected layers are aligned. At least one of voids, channels, openings, or recesses are located in or between at least some of the layers for receiving and holding lubricating oil. This reduces noise and wear.

A transmission device includes a plurality of guide pins, a first plate having multiple first guide slots, a second plate having multiple second guide slots, and a third plate having multiple third guide slots. A projection of each of the first guide slots on the third plate is deviated from a respective one of the third guide slots in a first rotational direction. A projection of each of the second guide slots is deviated from a respective one of the third guide slots in a second rotational direction which is opposite to the first rotational direction. The guide pins are respectively and slidably disposed in the second guide slots. When the first plate rotates, the guide pins slide synchronously and are equidistant from an axis.