A bicycle derailleur for operating a chain guide. The derailleur has primary actuator that imparts a primary displacement on the chain guide that has at least a component in an axial direction with respect to an assembly of toothed wheels. The derailleur also has secondary actuator that imparts a secondary displacement on the chain guide that has at least a component in a radial direction with respect to the assembly of toothed wheels. The secondary actuator can operate independently of the primary actuator.

An in-vehicle control apparatus is configured to execute a collision degree calculation process of, when it is determined that gear rattle occurs, calculating a collision degree that indicates a magnitude of a collision between a sleeve chamfer and a gear chamfer based on a rotation speed difference between a sleeve and an idler gear, execute an index value calculation process of calculating an index value that correlates with wear and tear of the sleeve chamfer and the gear chamfer based on the collision degree that is calculated each time it is determined that gear rattle occurs, and execute a wear and tear degree calculation process of calculating a degree of wear and tear of the sleeve chamfer and the gear chamfer by integrating the index value that is calculated each time it is determined that gear rattle occurs.

A toothed CVT using a Cone with One Torque Transmitting Member that is coupled by a Transmission Belt to another Cone with One Torque Transmitting Member for which teeth re-engagement between the Torque Transmitting Members and their Transmission Belt is improved. Said CVT uses a slack-side Tensioning Pulley in order to maintain the tension in the slack-side of the Transmission Belt almost constant so as to ensure smooth re-engagement of the Driven Cone; and a Transmission Diameter Compensating Mechanism, which increases the Transmission Diameter of the Driving Cone when the torque being pulled by the Driving Cone is increased, in order to compensate for an increase in “Transmission Belt Teeth Compression” and an increase in “stretching of the tense-side of the Transmission Belt”, due to an increase in tension in the tense-side of the Transmission Belt when an increased torque is transmitted; to ensure smooth re-engagement of the Driving Cone.

A gear system based on variably expandable gears, where input from either or both an operator or a computer processor may induce selective radial expansion and contraction of at least one gear in a gear set. The computer processor may be programmed to establish and maintain a desired gear ratio, regardless of the various variable forces which may be encountered, permitting gear setting and adjustment to control a desired parameter, such as speed, revolutions-per-minute, and watts with minimal effort by the operator.

A continuously variable transmission system having a first adjustable pulley and a second adjustable pulley, a belt being around an outer surface of both the first and the second pulley, and a CPU programed to signal a motor to adjust the first adjustable pulley and second adjustable pulley according to a user input is provided.

An effective chain-type CVT dynamic analysis method according to the present invention is capable of extracting stiffness data and deformation amount for each position from the pulley configuring in a flexible body and inputting into the pulley of the continuously variable transmission (CVT) system configuring in a rigid body to quickly and accurately calculate the deformation of the pulley due to contact with the pins of the chain.

A gas turbine engine for an aircraft, including the following: a core engine including a turbine, a compressor, and a core shaft connecting the turbine to the compressor; a fan, which is positioned upstream of the core engine, wherein the fan includes a plurality of fan blades; and a gear box which can be driven by the core shaft, wherein the fan can be driven at a lower rotational speed than the core shaft by means of the gear box, wherein the core shaft is designed as a drive shaft for the gear box and has at least one axial first region which has a diameter greater than the diameter of at least one axial second region, wherein the at least one first region is arranged axially between the drive side of the gear box and a mounting and/or attachment on a static part of the gas turbine engine.

The control mode is switched between a first control mode configured to control the speed change pump based on an actual speed ratio being an actual speed ratio of the variator, and a second control mode configured to control the speed change pump based on an actual working pressure being an actual working pressure of the variator. In the first control mode, the actual speed ratio is calculated based on a detected value of a vehicle speed; and the speed change pump is controlled to cause the actual speed ratio to approach the target speed ratio. In the second control mode, the actual working pressure is detected and the speed change pump is controlled to cause the actual working pressure to approach a target working pressure corresponding to the target speed ratio. In a situation or a condition where the detection accuracy of the vehicle speed by the vehicle speed sensor decreases, the control mode is switched from the first control mode to the second control mode.

A control apparatus for a continuously variable transmission includes a primary-pulley clamping force acquiring unit that acquires a clamping force of a primary pulley, a secondary-pulley clamping force acquiring unit that acquires a clamping force of a secondary pulley, an input torque acquiring unit that acquires a torque applied to the primary pulley, a transmission ratio acquiring unit that acquires a transmission ratio, a learning value acquiring unit, and a controller. When a learning condition is satisfied, the learning value acquiring unit decreases the clamping force of the secondary pulley while the transmission ratio and the input torque are kept substantially constant, and acquires, as a learning value, the clamping force of the secondary pulley at which a clamping force ratio is maximum. The controller adjusts a target clamping force of the secondary pulley on the basis of the learning value.

An in-vehicle control apparatus is configured to execute a collision degree calculation process of, when it is determined that gear rattle occurs, calculating a collision degree that indicates a magnitude of a collision between a sleeve chamfer and a gear chamfer based on a rotation speed difference between a sleeve and an idler gear, execute an index value calculation process of calculating an index value that correlates with wear and tear of the sleeve chamfer and the gear chamfer based on the collision degree that is calculated each time it is determined that gear rattle occurs, and execute a wear and tear degree calculation process of calculating a degree of wear and tear of the sleeve chamfer and the gear chamfer by integrating the index value that is calculated each time it is determined that gear rattle occurs.