Abstract: A bicycle sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket includes a plurality of first sprocket teeth, a first sprocket inward surface, a first sprocket outward surface, and an axial space. The second sprocket includes a plurality of second sprocket teeth, a second sprocket inward surface, and a second sprocket outward surface. The axial space is defined between the first sprocket outward surface and an axially inward outer link plate in the axial direction while the second sprocket outward surface contacts an axially outward inner link plate in an engagement state where the one of the plurality of the second sprocket teeth is positioned between an axially inward inner link plate and the axially outward inner link plate in the axial direction. The axial space is larger than mm and equal to or smaller than 0.15 mm.

Abstract: To provide a simple-structured chain drive mechanism that can reduce the noise generated when the chain sits on the sprocket, prevent deterioration of power transmission efficiency, and retard the progress of wear on the sprocket or chain. The chain drive mechanism includes a sprocket having a plurality of teeth, and a chain having a plurality of link plates and configured to be put around the sprocket. The sprocket includes a pair of flanges protruding circumferentially around the sprocket such as to sandwich the plurality of teeth from sides. The chain includes a pair of seat portions on both sides of the chain so that the flanges abut on the seat portions from a circumferential direction of the sprocket when the chain sits.

Abstract: A pulley device provides a pulley, and a bearing. The pulley has at least one C-shaped pulley part having an inner portion mounted on the bearing, an outer portion having an outer cylindrical surface dedicated to interact with a belt or a chain, and an intermediate portion extending substantially radially between axial ends of inner and outer portions on one axial side of pulley device. A grip surface portion is provided to one surface among the outer cylindrical surface of the outer ring and the inner cylindrical surface of the inner cylindrical portion of the pulley part, the grip surface portion including a plurality of indentations and recesses.

Abstract: A sub-assembly is presented, for a bicycle rear wheel, formed by a sprocket-carrying body and a cogset mounted coaxially on the sprocket-carrying body through shape engagement, is sized such that a good compromise is obtained between the ability to house a relatively large number of sprockets and the structural solidity of the sub-assembly.

Abstract: A continuously variable transmission for a vehicle includes a drive clutch, a driven clutch operably coupled to the drive clutch, and a belt extending between the drive and driven clutches. The continuously variable transmission also includes an inner cover and an outer cover removably coupled to the inner cover. At least one of the inner and outer covers includes an air inlet for providing cooling air to the drive and driven clutches and the belt.

Abstract: A derailleur comprises a base member configured to be attached to a human-powered vehicle frame, a movable member movable with respect to the base member, a pulley assembly pivotally attached to the movable member in a first pivotal direction and a second pivotal direction opposite to the first pivotal direction and including a first pulley having a first pulley axis and a second pulley having a second pulley axis, a pulley assembly biasing member configured to bias the pulley assembly with respect to the movable member in the first pivotal direction, a pulley distance (centimeter) being defined between the first pulley axis and the second pulley axis, a biasing return force (newton) being defined by rotational force of the pulley assembly relative to the movable member, and a return value defined by the biasing return force multiplied by the pulley distance. The return value is 136 or larger.

Abstract: A drive sprocket can include a plurality of teeth for meshing with a drive member to transmit rotary motion. The drive member can include a plurality of engagement pockets engaging the teeth of the drive sprocket, where each tooth has a tooth profile defined by a first side comprising a first engagement surface and an opposite second side comprising a second engagement surface, which engagement surfaces are configured such that when driven, a tooth meshes to the engagement pocket at a first contact location on the first engagement surface and also at a second contact location on the second engagement surface.

Abstract: The invention relates to an electromechanical derailleur for mounting on a rear wheel axis. The derailleur has a stationary element, a pivoting mechanism, a movable element having a chain guide arrangement, and a gearing housing. The gearing housing receives an electromechanical drive for driving the pivoting mechanism. The stationary element defines a housing void in which the gearing housing is disposed, and has a fastener for a power source. The power source is fastened to the stationary element such that said power source is electrically connected to the electromechanical drive in the gearing housing.

Abstract: The disclosure provides a chain type stepless transmission, including: a box, a pair of active cone discs including a fixed cone disc and a moving cone disc, a pair of passive cone discs including a fixed cone disc and a moving cone disc, an input shaft, an output shaft and a chain, there are a group of pulleys in the middle of each pair of passive cone discs and in the middle of each pair of active cone discs respectively, and the number of the group of pulleys may be an arbitrary value, such as 2, 3, 4, 5, 6, 7, 8, etc. In the stepless transmission, the fixed cone disc and the moving cone disc then transmit power from the input shaft to the output shaft through the chain, thereby realizing a high power of power transmission and a high torque.

Abstract: A bicycle drivetrain having a rear derailleur, a chain tensioner, and a chain guiding element which can be an idler pulley. The chain tensioner is separate from the rear derailleur and can be placed near the pedal crank. The bicycle to which the drivetrain is mounted has a drive chain, and the position of the lower portion of the drive chain (i.e. the portion of the drive chain that is not tensioned from pedaling forces) is elevated relative to that of bicycles with drivetrains having conventional rear derailleurs.

Abstract: A bicycle transmission device for connecting to a freehub body on a rear wheel, which has convex keys arranged radially on the periphery. The bicycle transmission device includes a connecting member, a fastener, and a cogset assembly. The connecting member includes a cylindrical body portion, connection keys protruding from a periphery of the body portion, a cut groove passing through the body portion, and first and second connecting seats located on two sides of the cut groove. The inner wall of the body portion has concave grooves corresponding to the convex keys. The fastener is adapted to be connected to the connecting seats and to pull them together. The cogset assembly includes a cogset seat and sprockets. The cogset seat has a first socket hole fitting around the connecting member and connection grooves corresponding to and adapted to be connected to the connection keys. The sprockets with different numbers of chain teeth are adapted to be connected to the cogset seat.

Abstract: A sprocket and chain assembly for bicycles is revealed. The sprocket and chain assembly for bicycles includes a bicycle sprocket and a bicycle chain. A contact part of the bicycle sprocket and a contact part of the bicycle chain in contact with each other are made of a multi-layer clad metal which is composed of a first metal and a second metal. The first metal has higher hardness and density than the second metal. A surface material for the contact parts of the bicycle sprocket and the bicycle chain is the first metal for providing sufficient wear resistance and ensuring service life of both the bicycle sprocket and the bicycle chain. Moreover, the lightweight design of the bicycle sprocket and the bicycle chain is achieved and sufficient structural strength is provided by the contact parts made of the multi-layer clad metal.

Abstract: A roller chain includes a plurality of inner and outer link units and a plurality of sealing rings. Each inner link unit includes two inner chain plates and two bushings. Each outer link unit interconnects an adjacent pair of the inner link units, and includes two outer chain plates and two connecting rods. Each of the outer chain plates has two inner surrounding surface portions each partially defining a retaining space. Each of the sealing rings is disposed in a respective one of the retaining spaces in the outer chain plates.

Abstract: A link chain comprises an inner link plate, an outer link plate, a bushing and a pin that form a chain link, and a labyrinth seal between the outer link plate and the inner link plate. The labyrinth seal comprises at least one lug having lug length and at least one groove having a groove depth, the lug length and groove depth being between 10% to 50% of an average respective link plate thickness, wherein in response to an overload of the link chain, the flow of force within the link chain is partially diverted across surfaces of the labyrinth seal formed by the at least one lug and the at least one groove.

Abstract: To provide a sprocket that reduces the influence of tension fluctuations concurrent with load torque variations to suppress noise and vibration, and that prevents an increase in tension fluctuations, noise, and vibration even when the chain tension is low and the load torque is small, and in regions where engagement between the chain and sprocket is free of the influence of tension. The sprocket has a plurality of seating points for the chain when the chain sits under no load set between adjacent pairs of the teeth such that their radial positions change in a circumferentially continuous manner. The radial positions of the seating points under no load have a variation pattern in which the radial positions increase and decrease depending on circumferential positions of the seating points.

Abstract: A bearing lubricator for lubricating a plurality of device bearings in a device includes a solitary monitored bearing and at least one unmonitored bearing. The bearing lubricator includes a reservoir configured to contain lubricant, a plurality of conduits connecting the reservoir to the plurality of bearing, and a mechanism connected to the reservoir for advancing the lubricant from the reservoir to the plurality of device bearings when actuated. The bearing lubricator further includes a solitary sensor for sensing a variable of the monitored bearing and a controller. The controller stores a triggering value of the variable of the monitored bearing. The mechanism advances a substantially identical quantity of the lubricant from the reservoir to each of the plurality of bearings when a signal indicative of the variable is advanced to the controller and when that signal indicates the triggering value of the variable has been met.

Abstract: The present invention provides lubrication systems, apparatus and methods for efficiently and reliably lubricating the drive chain and drive sprocket of a chain-driven vehicle during operation. Embodiments of the invention include a body having a reservoir of lubricating oil that is attachable to the vehicle using existing mounting bolts, a valve for controlling a flow of the oil to the sprocket and chain, a channel providing fluid communication between the reservoir and the valve, and an applicator for applying the lubricating oil to a drive sprocket of the vehicle. Oil is transferred via gravity from the reservoir to the applicator, and via centrifugal force from the applicator to the sprocket and chain.

Abstract: The present invention is a chain structure of bicycles, which comprises a plurality of rollers, a plurality of chain sheets and a plurality of chain rollers. Wherein the rollers define a mounting space. Each chain sheet comprises a chain body, a first pivot joint part extending from one end of chain body and to be arranged in the mounting space, a second pivot joint part horizontally extending from the other end of chain body, the second pivot joint part is installed on the roller with the first pivot joint part, wherein the first pivot joint part is in a horizontal position different from chain body, the first pivot joint part defines a rotation space for placing the second pivot joint part of another chain sheet, so that the first pivot joint part and second pivot joint part can rotate a preset angle in the rotation space.