A drive device (1) for a bicycle (100) includes a transmission (2) having a sensor for detecting a crank angle and a rotational speed of a pedal crankshaft and generating appropriate sensor data, a sensor for detecting a rotational speed of a driven shaft and generating appropriate sensor data, a sensor for detecting a rotational speed of the rotor shaft and generating appropriate sensor data, and a control device (10) configured for processing the sensor data and controlling by way of an open-loop system, a downshift from a currently engaged gear into a next-smaller gear as a function of the sensor data by energizing an electric machine (7).

A drive system for a vehicle includes a chain ring and a drive chain. The chain ring has a plurality of teeth serially arranged and joined to one another. A first subset of teeth has a first outer face that applies a lateral pressure to a link of a drive chain in a first direction. A second subset of teeth has a second outer face that applies a lateral pressure to another link of a drive chain in a second direction. The teeth all have substantially the same width. The top surfaces of the teeth are offset from the centerline of the drive chain. The centerlines of the top surfaces of the teeth are arranged asymmetrically on one side of the centerline of the drive chain.

A drive system for a vehicle includes a chain ring and a drive chain. The chain ring has a plurality of teeth serially arranged and joined to one another. A first subset of teeth has a first outer face that applies a lateral pressure to a link of a drive chain in a first direction. A second subset of teeth has a second outer face that applies a lateral pressure to another link of a drive chain in a second direction. The teeth all have substantially the same width. The top surfaces of the teeth are offset from the centerline of the drive chain. The centerlines of the top surfaces of the teeth are arranged asymmetrically on one side of the centerline of the drive chain.

An assembly for minimizing the disengagement of a chain from a chain ring is disclosed. The assembly includes a bracket and a chain guide assembly. The chain guide assembly includes an inboard leg, an outboard leg, and a lock. The lock may be configured to allow a rider to remove the outboard leg of the chain guide assembly without tools.

An assembly for minimizing the disengagement of a chain from a chain ring is disclosed. The assembly includes a bracket and a chain guide assembly. The chain guide assembly includes an inboard leg, an outboard leg, and a lock. The lock may be configured to allow a rider to remove the outboard leg of the chain guide assembly without tools.

A power transmission chain (2) for use with a drive member (4) having a plurality of teeth (6), and wherein: (i) the power transmission chain (2) comprises a plurality of chain links (8) which are pivotally connected together by connecting members (9) and pivot arrangements (10) so that the power transmission chain (2) can pass around the drive member (4) in use; (ii) each one of the pivot arrangements (10) comprises first and second pivots (12, 14) which extend towards each other from opposite sides (16, 18) of the chain links (8); (iii) the first and second pivots (12, 14) have adjacent ends (20, 22) which face each other and which are spaced apart; (iv) the power transmission chain (2) comprises a plurality of engaging formations (24) for enabling engagement with the drive member (4); (v) the engaging formations (24) are positioned between the adjacent ends (20, 22) of the first and second pivots (12, 14); and the engaging formations (24) and the spacing apart of the adjacent ends (20, 22) of the first and second pivots (12, 14) cause the power transmission chain (2) in use always to be positioned on the drive member (4) for maximum efficiency of drive transfer between the drive member (4) and the power transmission chain (2), and irrespective of the diameter of the drive member (4).

A bicycle sprocket comprises sprocket teeth. The sprocket teeth include at least one first tooth and at least one second tooth. The at least one first tooth has a first radial-tooth height. The at least one first tooth has a first chain-engaging axial width which is smaller than a first distance defined between opposed outer link plates of a bicycle chain and which is larger than a second distance defined between opposed inner link plates of the bicycle chain. The at least one second tooth is adjacent to the first tooth and is disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth is configured to engage with inner link plates of the bicycle chain. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height.

A bicycle sprocket comprises sprocket teeth. The sprocket teeth include at least one first tooth and at least one second tooth. The at least one first tooth has a first radial-tooth height. The at least one first tooth has a first chain-engaging axial width which is smaller than a first distance defined between opposed outer link plates of a bicycle chain and which is larger than a second distance defined between opposed inner link plates of the bicycle chain. The at least one second tooth is adjacent to the first tooth and is disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth is configured to engage with inner link plates of the bicycle chain. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height.

A power transmission chain (2) for use with a drive member (4) having a plurality of teeth (6), and wherein: (i) the power transmission chain (2) comprises a plurality of chain links (8) which are pivotally connected together by connecting members (9) and pivot arrangements (10) so that the power transmission chain (2) can pass around the drive member (4) in use; (ii) each one of the pivot arrangements (10) comprises first and second pivots (12, 14) which extend towards each other from opposite sides (16, 18) of the chain links (8); (iii) the first and second pivots (12, 14) have adjacent ends (20, 22) which face each other and which are spaced apart; (iv) the power transmission chain (2) comprises a plurality of engaging formations (24) for enabling engagement with the drive member (4); (v) the engaging formations (24) are positioned between the adjacent ends (20, 22) of the first and second pivots (12, 14); and the engaging formations (24) and the spacing apart of the adjacent ends (20, 22) of the first and second pivots (12, 14) cause the power transmission chain (2) in use always to be positioned on the drive member (4) for maximum efficiency of drive transfer between the drive member (4) and the power transmission chain (2), and irrespective of the diameter of the drive member (4).

An assisted and multifunctional ergonomic tricycle-type device for exercise, therapy, sports, recreation and alternative transportation for adults with or without disabilities, having a 4-piece chassis where part (1) is joined to part (2) by double equalizable hinge and the central part is “7” shaped, in the upper part of part (2) an adjustable front seat is installed, a cell phone holder and a Bluetooth speaker, and in the upper rear part of part (2) there is an equalizable arm extension housing an axle support of traction with hands and parts (2) and (3) of the chassis are joined to a support of an axle and a central shock absorber of the chassis and where part (2) also has supports on the front side of the drive axle with the feet and an adjustable support of an adjustable rear seat is installed on the upper rear part of part (3).