CN2421242Y - Speed variating chain wheel for tricycle - Google Patents

Abstract

The utility model relates to a speed variating chain wheel for a tricycle, which is provided with a convex wheel hub, and an outer circle of the convex hub is larger than that of a flywheel. A component is saved, the cost is reduced, and thus the component members are simple.

Description

The three-wheel vehicle speed-changing chain

The utility model relates to a kind of three-wheel vehicle speed-changing chain, is mainly used on the manual tricycle.

Prior art constructions is seen Fig. 2.Side at flywheel 1 has little speed-changing chain 2, and opposite side has packing ring 6 and big speed-changing chain 7.Increasing packing ring at the flywheel opposite side is the space of leaving motion with flywheel ingear chain in order to give.Its weak point is: need to set up a packing ring more, increased cost; It is simple that unit architecture is owed.

The purpose of this utility model is to overcome above-mentioned weak point of the prior art and a kind of three-wheel vehicle driving chain wheel that saves packing ring is provided.

The purpose of this utility model can reach by following measure: speed-changing chain of the present utility model has the wheel hub of protrusion, and protruding hub cylindrical is bigger than flywheel cylindrical.

The drawing of accompanying drawing is described as follows:

Fig. 1 is loaded on total figure that analyses and observe on the flywheel for the utility model;

Fig. 2 is the cutaway view of prior art.

The accompanying drawing piece number is represented:

1, flywheel 2, little speed-changing chain 3, protruding hub sprocket wheel 4, sprocket part

5, protruding hub 6, packing ring 7, big speed-changing chain

The utility model is described in further detail below in conjunction with embodiment and accompanying drawing:

Fig. 1 represents that the utility model is loaded on the structure on the flywheel.Flywheel 1 is arranged on the manual tricycle rear axle, and flywheel one side has the little speed-changing chain of using for the speed change transmission 2, and flywheel is identical with prior art with little speed-changing chain.Inventive point of the present utility model is: the packing ring 4 and the hinge wheel 7 of prior art are merged into a part, promptly protruding hub sprocket wheel 3.External diameter, the number of teeth of the big speed-changing chain of external diameter, the number of teeth and the prior art of the sprocket part 4 of protruding hub sprocket wheel are identical, and hub portion has the protruding hub 5 of protrusion, and the outside diameter in the protruding hub outside is bigger than the outside diameter of flywheel hub.

The utility model contrast prior art has following advantage:

Save a part, cost can reduce, and the parts structure is simpler.

Claims (1)

1, a kind of three-wheel vehicle speed-changing chain is characterized in that, speed-changing chain has the wheel hub of protrusion, and protruding hub cylindrical is bigger than flywheel cylindrical.

Images