A bicycle includes a frame, and a transmission device including a motor, a transmission unit, a crank unit, a sprocket and a unidirectional bearing. The transmission unit includes a first gear driven by the motor, a one-way clutch mounted in a compartment of the frame and connected between the first gear and the motor for limiting rotation to be transmitted from the motor to the first gear, and a second gear meshing with the first gear. The crank unit includes a crank shaft extending into the second gear, and first and second cranks connected respectively to two ends of the crank shaft. The sprocket is formed with an engaging hole non-rotatably engages the second gear and a receiving groove receives the unidirectional bearing for driving rotation of the sprocket in a single direction.

A bicycle crank assembly with adjustment orientation system for ovoid toothed chainrings comprising a right crank arm (2) provided with a fifth torque transmission profile (211); a shaft (1) provided with a second torque transmission profile (121) which is non-rotatably engaged to said fifth profile (211); and a transmission element (3), for incorporating toothed chainrings, provided with a fourth torque transmission profile (301) to non-rotatably engage with the first torque transmission profile (120) of the shaft (1). So, when combining the N2 angular positions provided by the coupling between the right crank (2) and the shaft (1) with the N1 angular positions provided by the coupling between the transmission element (3) and the shaft (1), Nt different relative angular positions between the right crank (2) and the transmission element (3) are obtained, thus increasing the possible orientations and decreasing the angular increment between consecutive orientations of the crank assembly.

Power transmitted from a cyclist to a bicycle through crank arms is indirectly measured by performing calculations on direct physical measurements. The direct physical measurements are taken from sensors that can be non-rotationally coupled to the frame of the bicycle. The sensors can be integrated into the frame or installed as a module within a standard, unmodified bicycle bottom bracket. Measured power can be viewed by the cyclist using a wirelessly connected user interface device.

A fitting structure of a bottom bracket shell of a bicycle contains: a hollow body having a receiving orifice. A first engagement element includes a first engaging section, a first aperture, and a first tilted guide portion. A second engagement element includes a second engaging section, a second aperture, and a second tilted guide portion. A first sleeve includes a first accommodation portion, a first connection portion, a first rib, a first abutting portion, and a first coupling section, wherein a first conically inclined face is defined between the first sleeve and the first tilted guide portion. A second sleeve includes a second accommodation portion, a second connection portion, a second rib, a second abutting portion, and a second coupling, wherein a second conically inclined face is defined between the second sleeve and the second tilted guide portion.

A quick-mount crank-pedal mechanism for a children bicycle is provided. The quick-mount crank-pedal mechanism is composed of a crank rod, a crank bearing and a pedal. The crank rod and the crank bearing are fitted with each other, and the pedal is coupled to the crank bearing. With the mechanism, the pedal is enabled to be in a usable state quickly without using any tools, and a tip of the crank is effectively protected from puncturing through a carton, thereby reducing potential safety hazards.

Power transmitted from a cyclist to a bicycle through crank arms is indirectly measured by performing calculations on direct physical measurements. The direct physical measurements are taken from sensors that can be non-rotationally coupled to the frame of the bicycle. The sensors can be integrated into the frame or installed as a module within a standard, unmodified bicycle bottom bracket. Measured power can be viewed by the cyclist using a wirelessly connected user interface device.

The original abstract is amended to An operation parameter detecting apparatus for a vehicle is provided to obtain a pedaling torque value, an angle of a central shaft with a magnetic ring, a corresponded rotating speed and a corresponded pedaling power, respectively by measuring an electromagnetic force of a coil induced by a magnetic variation due to a deformation of a covered magnetic sleeve linked to a central shaft, a voltage output from at least a Hall corresponded to a magnetic flux density of which the distribution in a 1, 2 or 3 dimensional space is partly a monotonic increasing or decreasing function in an area with the same polarity, and at calculation relative to the time.

A bicycle pedal crank arm hole protection device. The device comprises a metal threaded insert to be screwed into the crank arm threaded hole when pedals have been removed from the pedal crank arm and a smoothly rounded cover to dampen any contact with other objects.

A bicycle crank assembly comprises a sprocket, a crank axle, a movable member, a torque transmitting member, and a bearing structure. The sprocket has a rotational center axis. The crank axle extends along the rotational center axis. The crank axle includes an internal space. The movable member is movably provided in the internal space to move the sprocket in an axial direction of the rotational center axis. The torque transmitting member is to transmit a pedaling torque from the crank axle to the sprocket. The bearing structure is disposed between the movable member and the crank axle to slidably support the movable member in the axial direction. The bearing structure is disposed at a location different from a location of the torque transmitting member in the axial direction.

A reciprocating action drive having an elastically extensible reversing mechanism is disclosed in which drive levers are connected to a driven shaft by overrunning clutches such that when the levers are moved in a first direction, the shaft is driven, but when moved in a counter-rotating direction, it is not. The extensible reversing mechanism links the levers such that, when not extended, it causes the two levers to counter-rotate, only allowing one to drive the shaft. However, when the lever being moved in the non-driving direction changes direction, the reversing mechanism extends and does not immediately cause the other lever to change direction, but allows it to continue to move in the driving direction. Both levers may, therefore, simultaneously drive the driven shaft for as long as the extensible reversing mechanism extends, allowing latitude for unsynchronized reciprocating motions to be applied without them competing against each other.