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.

A flexibly engaged continuously variable transmission gearbox includes the following components connected sequentially in a transmission: a power input shaft conical roller, a sectional input flexible sprocket, a tooth-shaped chain, a sectional output flexible sprocket, a power output shaft conical roller. When the power input shaft conical roller rotates, it drives five sectional input flexible sprocket members that are slidably matched in five equidistant T-shaped grooves on the conical roller to rotate. The sectional input flexible sprocket drives the tooth-shaped chain engaged therewith to transmit, and thus drives the five sectional output flexible sprocket members that are slidably matched in the five equidistant T-shaped grooves on the output shaft conical roller to rotate. The five sectional output flexible sprocket members are connected to the output shaft conical roller through the five equidistant slidable T-shaped grooves.

A belt pulley arrangement with a belt pulley that is fastenable to rotate on a shaft, a torsion spring arranged within the belt pulley for enabling a transmission of torque between the belt pulley and shaft. The torsion spring acts with one end against the shaft and with an other end against the belt pulley. A looped flat spiral spring is arranged radially between the belt pulley and the torsion spring and acting as a free-running clutch. The torsion spring is arranged on one of its axial ends in a first sleeve that is connected so that it can rotate with a radial inner lateral surface of the belt pulley. The looped flat spiral spring is arranged radially between the first sleeve and the torsion spring, and contacts, in its extended state, at least in some sections on the inner lateral surfaces of the first sleeve and belt pulley.

An electric front derailleur for a bicycle. The derailleur includes a chain guide, a linkage assembly movably connected to the chain guide, and an electrical actuation unit operatively coupled to the linkage assembly to move the chain guide with respect to the electrical actuation unit. The electrical actuation unit includes a mounting portion configured to be attached to a bicycle frame. The mounting portion is secured to the electrical actuation unit. The mounting portion permits the position of the electric front derailleur to be adjusted with respect to the bicycle frame.

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.

An electric bicycle derailleur control system is basically provided with a derailleur, a detecting device and a controller. The derailleur includes a chain guide and an electrical actuator. The chain guide is configured to displace a bicycle chain. The electrical actuator is operatively coupled to the chain guide to displace the chain guide. The detecting device is configured to detect information related to a reaction force of the bicycle chain. The controller is configured to control the electrical actuator in accordance with detected information.

The present invention relates to a bicycle derailleur gear, particularly a front derailleur gear, with improved reliability that comprises a kinematic mechanism in the form of a four-bar linkage with a base body and a mobile body connected together through a pair of connecting rods hinged to the base body and to the mobile body at four pin elements, the mobile body carrying a chain guide, the four-bar linkage-kinematic mechanism being associated with derailleur gear actuation means suitable for deforming the four-bar linkage-kinematic mechanism so as to determine a displacement of the mobile body with respect to the base body and consequently a displacement of the chain guide, the derailleur gear actuation means being of the motorized type and comprising a motor casing and an outlet shaft that projects directly from said motor casing and characterized in that the actuation means command a translation in the axial direction of the outlet shaft with respect to the motor casing and are mounted between distinct components of the four-bar linkage-kinematic mechanism through interposition of at least one tilting interface about a fifth pin element substantially parallel to the pin elements.

A chain tensioning device includes a main body, a chain guide and a rotary fluid damper unit. The chain guide is pivotally coupled to the main body to rotate around a rotational axis with respect to the main body. The rotary fluid damper unit is operatively connected between the main body and the chain guide to provide rotational resistance to the chain guide around the rotational axis. The rotary fluid damper unit includes at least one primary flow limiting valve and at least one support member. The primary flexible valve portion of the at least one primary flow limiting valve is configured to flex and contact the at least one support member to form a primary flow path between a free end of the primary flexible valve portion of the at least one primary flow limiting valve and the other of the first and second members.

An electrical bicycle derailleur includes a base member and a movable member movably arranged between a retracted position and an extended position. A linkage operatively couples the movable member to the base member. The linkage includes a first link member and a second link member. The first link member is disposed closer to the base member than the second link member. A motor unit is operatively coupled to the first and second link members to rotate the first and second link members. A linkage housing is configured to support the first and second link members and the motor unit. A first diameter of the first link member is different from a second diameter of the second link member and/or a first tooth number of the first link member is different from a second tooth number of the second link member.

The present invention refers to a bicycle gearshift with improved precision control, which comprises a kinematic mechanism in the form of a four-bar linkage with a base body and a mobile body connected together through a pair of connecting rods articulated to the base body and to the mobile body at four pin elements, each pair of opposite pin elements of the four pin elements defining a diagonal of the four-bar linkage-kinematic mechanism, the base body comprising a first attachment group to a bicycle frame and the mobile body being connected to a chain guide at a second attachment group, the four-bar linkage-kinematic mechanism being associated with gearshift actuation means suitable for deforming the four-bar linkage-kinematic mechanism so as to determine a displacement of the mobile body with respect to said base body and consequently a primary displacement of the chain guide in the axial direction with respect to the axis (A) of a cogset, at least one from the first attachment group and the second attachment group comprising a chain tensioning spring, the chain tensioning spring determining a set-up of the chain guide when engaged with a chain of a bicycle transmission, and it is characterized in that it comprises a kinematic mechanism for adjusting the preload of the chain tensioning spring as a function of the primary displacement of the chain guide so as to determine a variation in the set-up of the chain guide.