Wheel hub arrangement for a wheel drive by an alternating symmetric drive system using a flexible pulling element, that can be used in vehicles particularly in bicycles

摘要

Wheel hub arrangement with three drum units comprising a hollow drum (18), a winding of a flexible pulling element fixed on the drum, and a biasing spring (22) in the hollow inner space. Respective free-wheels (36) are provided at sides of the hub unit (4). The wheel hub unit comprises a pair of spaced driving sleeves (33) arranged in axial direction and the sides of the driving sleeves facing to a drum unit and being connected therewith to transmit of torque only. The driving sleeves are surrounded by intermediate sleeves (38) and a spacing is formed between them, wherein a ball bearing (35) and one of the freewheels are arranged so that they are connected both with the outer surface of the driving sleeve and the inner surface of the intermediate sleeve. The intermediate sleeves are connected rigidly together and they are also connected at least during the driving sessions to an outer sleeve (40) of the wheel hub unit.

主权项

1. Wheel hub arrangement for a wheel driven by an alternating symmetric drive system having an alternating driving operation using a flexible pulling element used in vehicles, which is connected to frame parts of the vehicle in a releasable way that hold the wheel, comprising:
a first drum unit (3), a wheel hub unit (4) a second drum unit (5);said units are arranged axially side-by-side along a common wheel axis and define a central axial bore;
a fixing shaft (10) lead through said central bore and being connected to said frame parts in a releasable manner,
said drum units (3, 5) each comprise: a hollow drum (18) having an outer surface, a winding of said flexible pulling element fixed to said hollow drum (18), wherein during said alternating driving operation said flexible pulling element being wound up and down, said wheel hub unit (4) comprises an outer sleeve (40) being pivoted for rotation around said wheel axis, said outer sleeve (40) comprises connection parts that can be connected to elements supporting and holding said wheel, and the arrangement comprises respective freewheels of first type close to each side of said hub unit, and when said hollow drums being rotated in the driving direction said freewheels allow rotation of said sleeve (40) with the drum that momentarily has a higher angular speed than the other drum, whereas said freewheels allow the wheel to freely rotate in forward direction when the speed of the wheel is higher than the angular speed of any of the drums, characterized in, that said wheel hub unit (4) comprises: a stationary central tubular shaft (9) around said fixing shaft (10), a pair of driving sleeves (33) pivoted for rotation around said stationary tubular shaft (9), said driving sleeves being spaced from each other in axial direction, have respective side surfaces facing towards an associated one of said drum units (3, 5) and being connected to the associated drum unit (3 or 5) so that said connection being capable of transmitting torque only; respective intermediate sleeves (38) surrounding an associated one of said driving sleeves (33) and being spaced therefrom in radial direction to form a ring-like space; respective ball bearings (35); wherein said ball bearings (35) and said freewheels (36) being arranged in the ring-like space formed between said driving sleeves (33) and the associated intermediate sleeves (38), both said ball bearings (35) and said freewheels (36) have inner and outer surfaces and being designed in such a way, that their inner surfaces are fitted to outer surface of the associated driving sleeve (33) and outer surfaces fitted to inner surfaces of the associated intermediate sleeve (38), and said intermediate sleeves (38) are rigidly interconnected and at least when the wheel being driven are also rigidly connected to said outer sleeve (40).