Abstract: A pulley device for a transmission element having a pulley, a bearing, and at least one sleeve mounted freely in the bore of the inner ring of the bearing. The pulley device includes at least one annular protection shield, the shield retained axially in a first element from the pulley and coming into immediate proximity with the other element, the other element having at least one shoulder projecting radially ensuring that it is axially retained with the shield.

Abstract: A sprocket for engagement with a drive chain has a plurality of teeth extending radially from a periphery of the sprocket, including a first and a second group of teeth; the teeth of the first group and the second group are alternately arranged so that each tooth of the first group is followed by a tooth of the second group, and vice versa; each tooth of the first group having a first maximum width, each tooth of the second group having a second maximum width which is larger than the first maximum width; each tooth of the second group has a protrusion on at least one lateral face of the tooth; the outer lateral face of the protrusion extends over a first portion of the lateral face of each tooth of the second group, the length being 50% of the length of the respective tooth or less.

Abstract: A flyweight comprises a body. The body of the flyweight comprises a pivot, a cam surface, and a first coupler. The first coupler is configured to selectively couple at least one first weight to the body distal from the cam surface. A flyweight comprises a body having at least 20% of its mass positioned to contribute negative torque about a pivot related to an acceleration of a CVT clutch from an idling condition. A method of tuning a flyweight comprises attaching at least one first weight to a first coupler of a body of the flyweight distal from a cam surface of the body. A CVT clutch comprises at least one flyweight with a first coupler configured to selectively couple at least one first weight to a body of the flyweight distal from a cam surface.

Abstract: In a waterproof case, a contact surface of a specific member that is a case main body or a cover is a surface extending along a predetermined oblique direction inclined relative to a perpendicular plane orthogonal to a die pull-out direction. The specific member includes a circumferential projection that projects from the contact surface in the die pull-out direction, is arranged circumferentially along the contact surface, and presses a sealing member. The circumferential projection includes an outer peripheral side surface and an inner peripheral side surface. In the first region, the circumferential projection has a tapered section in which the outer peripheral side surface is inclined relative to the die pull-out direction. In the second region, the circumferential projection has a tapered section in which the inner peripheral side surface is inclined relative to the die pull-out direction.

Abstract: Disclosed is lateral pressure control of a continuously variable transmission (CVT) with a transmission ratio changed by changing groove widths of a drive pulley and a driven pulley, a drive force from a drive source being transmitted to a wheel. A control part controlling respective lateral pressures of the drive pulley and the driven pulley is provided. The control part sets an increase correction amount of the lateral pressure of the drive pulley to a first lateral pressure increase correction amount if the CVT is not in an in-gear state or a shift position is consistent with a traveling direction of the vehicle, and, sets said amount to a second lateral pressure increase correction amount smaller than the first lateral pressure increase correction amount if the CVT is in the in-gear state and the shift position is not consistent with the traveling direction of the vehicle.

Abstract: A pulley device for a tensioner roller or winding roller of a transmission element, providing a pulley, and a bearing. The bearing includes a rotating outer ring mounted to the pulley, a fixed inner ring, and at least one row of rolling elements arranged between the rings. The inner ring of the bearing has at least one end portion protruding axially with respect to the outer ring. The pulley is provided with at least one pulley element that is C-shaped in axial section. One of the at least one pulley elements is provided with a lateral portion extending substantially radially to pass into the immediate vicinity of an outer surface of the axially protruding end portion of the inner ring.

Abstract: In an aspect a device for a driven shaft is provided that receives an input torque that varies cyclically between a peak input torque and a low input torque at a peak input torque frequency, which includes a shaft adapter, a rotary drive member, at least one isolation member, a torsional vibration damping structure including an inertia member and a elastomeric damping member, and a supplemental damping structure. The supplemental damping structure applies a supplemental damping torque to resist relative movement between the rotary drive member and the inertia member in addition to damping provided by the elastomeric damping member. A sum of torques including the supplemental damping torque limits a maximum twist between a first end of the driven shaft and a second end of the driven shaft, to below a yield point of the driven shaft.

Abstract: An Actuating device for a bicycle is provided. The actuating device may include a static element which is positionally fixed in relation to a bicycle frame, a movable element which is movable in relation to the static element, an electromechanical drive which provides drive force for a movement of the movable element. The electromechanical drive has a motor and a gearing driven by the motor. The gearing may include a first gearing wheel and a second gearing wheel which is in engagement with the first gearing wheel.

Abstract: A variety of shifter mechanisms are provided for controlling the axial distance between half-pulleys of a split pulley variable transmission, thus controlling the transmission ratio of the variable transmission. Some of these embodiments include a differential such that a variable transmission can be driven and shifted differentially by two inputs. A torque or rotation difference between the inputs results in a change in the transmission ratio and in-common torque or rotation is transmitted through the transmission to an output. The same motors used to drive the output of the transmission are thus also able to effect shifts in the transmission ratio. Accordingly, motor mass that is not being used to effect high-speed shifts may be used to drive the transmission output, and vice versa. The provided shifter embodiments are well-suited to application to nested-pulley variable transmissions, including nested-pulley infinitely variable transmissions.

Abstract: A control device comprises a controller configured to control an actuator to move an output member in a first actuating manner in a first state where an electric power source configured to supply electricity to the actuator is in a first power-source state and where a movement of the output member does not reach a target movement after the controller controls the actuator based on control information. The controller is configured to control the actuator to move the output member in a second actuating manner different from the first actuating manner in a second state where the electric power source is in a second power-source state different from the first power-source state and where the movement of the output member does not reach the target movement after the controller controls the actuator based on the control information.

Abstract: The present invention relates to a bicycle chainring (1) for engagement with a drive chain provided with rollers, the bicycle chainring (1) comprising: a plurality of teeth (2, 3) extending radially from a periphery of the chainring (1), wherein the plurality of teeth (2, 3) comprises a plurality of narrow teeth (3) and a plurality of wide teeth (2), wherein each tooth (2, 3) comprises a front flank (5) and a rear flank (6) with respect to a drive direction (DD) and two opposing side surfaces (9), wherein at least one side surface (9) of each wide tooth (2) comprises a protrusion (7) extending therefrom in an axial direction of the chainring (1), wherein each protrusion (7) comprises a respective groove (8) arranged halfway between a top land (10) of the respective wide tooth (2) and a root circle (11) of the respective wide tooth (2), wherein the groove (8) extends throughout the protrusion (7) in a direction substantially parallel to the top land (10).

Abstract: A transmission system using a toothed belt includes a belt body made of elastomer and a core wire made of carbon fiber and provided so as to be embedded in the belt body and form a helix having a pitch in a belt width direction. The belt body includes a flat band portion having a horizontally long rectangular cross section and a plurality of tooth portions integrally provided on an inner peripheral side of the flat band portion. A belt tension T0.2 per belt width of 1 mm when a belt elongation rate is 0.2% is 70 N/mm or more, an amount of backlash between the toothed belt and a toothed pulley is 0.10 mm or more and less than 0.65 mm, a hardness of the belt body is 89° or more in JIS K 6253 Durometer Type A, and a surface dynamic friction coefficient is 1.5 or less.

Abstract: The present disclosure relates to a chain ring having teeth positioned in one of three lateral positions. At least one tooth may be placed in each lateral position. At least half the teeth may be positioned in a middle lateral position. The teeth in the first and third lateral positions may apply opposing lateral forces to a bicycle drive chain.

Abstract: A bicycle sprocket is basically provided with a sprocket body and a plurality of chain-driving teeth. The sprocket body includes a central portion, an annular portion and an intermediate portion. The central portion has a central opening through which the rotational center axis passes and a plurality of internal splines for engaging external splines of a crank arm. The annular portion is disposed radially outward from the central portion with respect to the rotational center axis. The intermediate portion extends between the central portion and the annular portion in a radial direction about the rotational center axis. The plurality of chain-driving teeth extends radially outward from the annular portion of the sprocket body to engage with a bicycle chain. The sprocket body and the plurality of chain-driving teeth are formed as a one-piece, unitary member.

Abstract: A bicycle derailleur comprises a base member, a chain guide, a motor unit, and a linkage structure. The base member has at least one first link-pin-receiving opening. The motor unit has at least one second link-pin-receiving opening. The linkage structure comprises at least one link member and at least one link pin. The at least one link member is configured to movably couple the chain guide to the base member. The at least one link member has at least one third link-pin-receiving opening. The at least one link pin is configured to pivotally couple the at least one link member to the base member about at least one link pivot axis. One of the at least one link pin is configured to extend through the at least one first link-pin-receiving opening, the at least one second link-pin-receiving opening, and the at least one third link-pin-receiving opening.

Abstract: A front sprocket assembly comprises a first sprocket and a second sprocket. The second sprocket includes a second sprocket body and a plurality of second sprocket teeth. At least one tooth of the plurality of second sprocket teeth includes a less chain-interference recess provided to the second axially inwardly facing surface. The less chain-interference recess is configured to reduce interference between the at least one tooth of the plurality of second sprocket teeth and a chain in an upshifting operation in which the chain is shifted from the first sprocket toward the second sprocket. The less chain-interference recess has a radially innermost end positioned radially inwardly from a tooth bottom circle of the plurality of second sprocket teeth. A radial distance radially defined from the tooth bottom circle to the radially innermost end with respect to a rotational center axis is equal to or larger than 1.0 mm.

Abstract: Chain-rings sets for power transmission systems, where at least one of the chain-rings is formed by independent segments provided with axial displacement means, where the segmentation is optimum both for shifts to a bigger chain-ring or a smaller chain-ring through a relative configuration between chain-rings, especially between the teeth involved in the power transmission during the shift, that ensure a smooth shift, efficient in the power transmission and reducing as possible the friction and the wear of the components.

Abstract: A bicycle derailleur comprises a circuit board, an electrical user interface, a motor housing, and a motor unit. The electrical user interface includes a user accessing portion configured to receive a user input. The motor housing includes a motor accommodating space. The motor unit is provided in the motor accommodating space and configured to generate rotational force and configured to be electrically connected to the circuit board. A first direction is defined from the circuit board toward the electrical user interface or from the electrical user interface toward the circuit board. The plurality of second directions is defined to be perpendicular to the first direction. The motor unit is at least partly provided between the user accessing portion of the electrical user interface and the circuit board when viewed in at least one of the plurality of second directions.

Abstract: A derailleur system is provided that moves the derailleur cage in a substantially rectilinear path. The derailleur is mounted to a frame having a gear cassette mounted thereon. The gear cassette includes an axis of rotation. The derailleur includes a drive member engaging the gear cassette. The derailleur is positioned on the frame adjacent the gear cassette, and including a spatial linkage having a stationary link, a floating link, and a cage assembly having two pulleys each defining an axis of rotation. The drive member engages each of the pulleys. The path of the floating link is substantially linear through substantially its entire range of motion and variously aligns at least one of the pulleys with the gear cassette.

Abstract: A pulley device comprising 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. The outer cylindrical surface of outer ring is provided with at least one recess having in cross-section, a concave internal profile. The pulley part is provided with at least one protruding portion which inwardly extends beyond the inner cylindrical surface of inner portion. The protruding portion is received in a corresponding recess of outer ring so as to block the pulley part with respect to the outer ring in both axial directions.