Disclosed is a crank variable-speed gear device (100) wherein the gear ratio can be increased to 1.6:1 to 1.8:1 through a gear assembly and a latch assembly, and the gear ratio can also be changed to 1:1, if necessary, thereby providing an excellent transmission efficiency, facilitating the manipulation thereof, and making it possible to provide a compact and lightweight bicycle.

A harmonic ring gear system can include at least one inner gear with external toothing, the at least one inner gear defining an axis of rotation; at least one outer gear with internal toothing arranged concentrically to the at least one inner gear about the axis of rotation, the internal toothing spaced apart from the external toothing; a pin ring positioned between the at least one inner gear and the at least one outer gear, the pin ring comprising a multiplicity of pins; and a rotary transmitter configured to lift a portion of the pins of the multiplicity of pins off the external toothing and press the portion of the pins into the internal toothing.

A bicycle drive unit includes a housing, a crankshaft and a propulsion assist motor. The housing is configured to be coupled to a frame of a bicycle. The housing includes first and second portions. The crankshaft is provided to the first portion of the housing. The propulsion assist motor is provided to the second portion of the housing. The propulsion assist has a rotational axis extending in a direction intersecting with a direction in which the crankshaft extends. A maximum dimension of the first portion in the direction in which the crankshaft extends is less than or equal to 100 mm. A maximum output torque of the propulsion assist motor is greater than or equal to 10 Nm and less than or equal to 80 Nm.

A load cell for determining a radial force acting on a crankshaft includes a receiving sleeve for receiving a ring of a bearing; a fastening ring for attaching the load cell in a transmission housing; axial support areas provided on the fastening ring for axially supporting the ring of the bearing; and measuring regions for receiving radial forces of the receiving sleeve and which connect the receiving sleeve with the fastening ring, wherein strain sensors are attached to at least two of the measuring regions; and wherein the measuring regions comprise measuring lugs formed as angle brackets.

A power train of a pedal vehicle includes a crankset axle and a first output plate having a first axis of rotation. The first output plate is coupled with a transmission chain or belt so as to drive the rear wheel of the pedal vehicle. The coupling between the crankset axle and the transmission chain or belt extends through a planetary gear train which rotates about a second axis of rotation. The crankset axle is further coupled to the first output plate by a first free wheel (16) which is arranged to prevent the first output plate from rotating slower than the crankset axle when the crankset axle rotates in the normal pedalling direction.

A pedally propelled vehicle multi speed gear system includes a gear mechanism including a main shaft; a hollow first shaft and a hollow second shaft, both axially stationary and rotatably arranged about the main shaft; an epicyclical first gear section arranged about the main shaft between the first and second shafts, and including two radially stacked carrier elements; and a first shift mechanism arranged between the first shaft and the first gear section, and configured to rotationally engage the first shaft with either of the two radially stacked carriers. The first shift mechanism includes two first clutches radially stacked about the main shaft.

A harmonic ring gear system can include at least one inner gear with external toothing, the at least one inner gear defining an axis of rotation; at least one outer gear with internal toothing arranged concentrically to the at least one inner gear about the axis of rotation, the internal toothing spaced apart from the external toothing; a pin ring positioned between the at least one inner gear and the at least one outer gear, the pin ring comprising a multiplicity of pins; and a rotary transmitter configured to lift a portion of the pins of the multiplicity of pins off the external toothing and press the portion of the pins into the internal toothing.

The invention relates to a hybrid drive system for a bicycle comprising a crank, an electric motor, a rear wheel hub shell, an intermediate drive part, a first transmission connecting the crank to the intermediate drive part, and a second transmission connecting the electric motor to the intermediate drive part. The intermediate drive part is connected or connectable to the rear wheel hub shell. The system can include a first clutch between the intermediate drive part and the rear wheel hub shell for in a first mode rotationally coupling the rear wheel hub shell to the intermediate drive part, and in a second mode rotationally decoupling the rear wheel hub shell from the intermediate drive part.

The invention relates to a propulsion system (1) for a pedal vehicle. The propulsion system (1) comprises a power unit (1) allowing the power originating from a bottom-bracket axle (2) to be combined with the power from two motors (40, 50), a first deformable transmission element (23) allowing the transmission of power to the rear wheel (73) and a casing assembly (19) enclosing particularly the first deformable transmission element (23) and the power unit (1), with the exception of part of the bottom-bracket axle (2).

A propulsion device for a two-wheeled vehicle , in particular for an e-bike, includes: a mechanism for the bottom bracket, provided with cranks and pedals, suitable for providing traction to a rear wheel for manual advancement of the vehicle, a first epicyclic gear reducer coupled with the mechanism for the bottom bracket, drivable by a first control device configured for varying the geometric configuration of the first epicyclic gear reducer and thus the gear ratio, a motor for assisting pedalling interposed between the mechanism for the bottom bracket and the rear wheel, coupled with a second epicyclic gear reducer, drivable by a second control device configured for varying the geometric configuration of the second epicyclic gear reducer and thus the corresponding gear ratio, the second epicyclic gear reducer being coupled and directly in contact with the rear wheel, in order to transmit the movement from the propulsion device thereto.