Fichtel & Sachs Ag

Andreas Neuer

Frank Schmidt

Jorg Bodmer

Gerhard Dumbser

Markus Krumbeck

Holger Brandt

A bicycle power train for bicycles, the bicycle power train including a driving sprocket set and a driven sprocket set. A chain connects the driving sprocket set and the driven sprocket set to one another. The chain transfers torque from a sprocket of the driving sprocket set to a sprocket of the driven sprocket set. The torque is transferred to the chain from the driving sprocket via drive teeth disposed on the driving sprocket. The drive teeth each include a drive flank that engages a corresponding link roller of the chain. Each drive flank has a bevel formed thereon, the bevel being shaped to compensate for the lengthening of the chain with wear. The bevel is configured to maximize the number of drive teeth that can simultaneously engage the chain and participate in the transfer of torque over the life of the chain.

Bicycle and a bicycle having a bicycle power train

Derailleur with at least two sprockets on a sprocket set which is located around a pedal axle of a bicycle, which sprockets are provided with chain transfer assistance measures to assist the transfer of the chain in upshifting or downshifting, whereby the shifting can be done under load in both of these directions. The chain transfer assistance measures comprise a tooth space with a spiral-shaped base, a conical rivet with an encircling sharp edge to locate the chain in the vicinity of its links between the chain plates, as well as bevels, recesses and steps, the totality of which optimize the chain transfer in both directions between sprockets which are coordinated with one another.

Derailleur

A multiple sprocket chainwheel for bicycle derailleurs to drive a hub bushing on the rear wheel by means of at least two sprockets which have different numbers of teeth, and which are located non-rotationally on a chainwheel bushing, whereby spacing connecting rings with bearings and a drive bushing are located between the sprockets, which drive bushing is driven in the driving direction by the chainwheel bushing by means of a freewheel mechanism, whereby the connecting rings have clamping projections which can be inserted into clamping points on the sprockets, which makes possible it possible to have an alternating arrangement in series of a sprocket, a connecting ring, a sprocket, a connecting ring etc. The desired position of one sprocket in relation to another is achieved when a guide tooth on the inside diameter of the one sprocket coincides with the guide tooth on another sprocket. A packet of sprockets combined in this manner has an axially continuous guide tooth which, when located in a longitudinal groove on the circumference of the drive bushing, guarantees the angular position of each part slid onto the drive bushing. The multiple sprocket chainwheel, which can be modified or repaired without tools, can be treated as a pre-assembled component or as a replacement part, whereby its particular advantage is that the individual sprockets can be replaced, or the entire multiple sprocket chainwheel can be assembled manually by the customer.

Multiple sprocket chainwheel for bicycle derailleur

A derailleur with at least two sprockets (A, C) on a sprocket unit (A-C) is designed so that the chain (B) can be shifted up and down more easily between a smaller sprocket (C) and a larger sprocket (A). For this purpose, there is a double tooth space (ZA) on at least the larger sprocket (A), which forms a channel for the transfer of the chain between the two sprockets. By means of a link support plate (16) of the larger sprocket (A), a path (B1, B2. B3, B4, B5) which is curved or bent radially outwardly convexly--seen in the axial direction--of a chain transfer segment is achieved, which is formed during the transfer of the chain from the smaller sprocket (C) to the larger sprocket (A) in the vicinity of the double tooth space (ZA).

Growing community of inventors

Schweinfurt, Germany

Andreas Neuer