CN2388109Y

CN2388109Y - Bicycle middle axle

Info

Publication number: CN2388109Y
Application number: CN 99218351
Authority: CN
Inventors: 闻德华
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-28
Filing date: 1999-07-28
Publication date: 2000-07-19
Anticipated expiration: 2009-07-28

Abstract

The utility model relates to a bicycle middle axle, which belongs to household vehicles. The utility model is composed of a left and a right cranks and a middle axle tube, wherein, both ends of which are provided with bearings; the outer ends of a retainer ring and an oil seal are provided with a hub, a chain wheel and the left and the right cranks; the diameter of the bearings arranged at both ends of the middle axle tube is no more than the diameter of the root circle d < root >. At the time of riding and pedaling, following the rotation of the middle axle tube and the bearings, a power arm can be extended; work stroke of pedaling force can be reduced. The utility model has the advantages of comfortable, fast, stable and safe riding of the bicycle, increased rotary speed, reduced pressure angle and labor saving, is suitable for new manufacture and refitting of various bicycles.

Description

A kind of later-model bicycle middle shaft

The utility model belongs to the home-use vehicle and is particularly related to a kind of later-model bicycle middle shaft.

At present, the bicycle middle shaft of use is made up of axis rod, axis ball-collecting rack, axis ball bowl, middle axle bumper, when riding, step the pedal that is installed on the crank, axis is rotated together with sprocket wheel, sprocket wheel drives chain, flywheel, rear axle, rear wheel is rotated, drive bicycle running.But axis ball-collecting rack, the ball bowl of this bicycle wear and tear easily, and efficient is low.

Task of the present utility model is to overcome in the above technology not enough, and a kind of later-model bicycle middle shaft is provided.

Task of the present utility model is that a kind of later-model bicycle middle shaft is made up of left and right crank, central siphon, bearing is installed, oil sealing, outside back-up ring, sprocket wheel, the left and right crank installed at the central siphon two ends, substitute ball-collecting rack, ball bowl, central siphon end mounted bearing diameter≤sprocket tooth root circle d _RootDiameter is ridden when scrunching, and along with central siphon, bearing rotate, has prolonged power arm, reduces scrunching power work done stroke, makes cycling comfortable brisk, steadily safety.

Specify with by way of example below in conjunction with accompanying drawing.

Fig. 1 shows a kind of later-model bicycle middle shaft section of structure.

1-left side crank among the figure; The 6-oil sealing; The 2-back-up ring; The 3-bearing; The 4-central siphon; The 5-sprocket wheel.

See Fig. 1, a kind of later-model bicycle middle shaft, by (1) left and right sides crank, (4) central siphon is formed, bearing, (2) back-up ring, (6) oil sealing are installed in central siphon (3) two ends, (7) outside installation shaft skin, (5) right-hand member is equipped with sprocket wheel, central siphon end mounted bearing diameter≤sprocket tooth root circle d _RootDiameter.

Claims

1, a kind of later-model bicycle middle shaft is made up of (1) left and right sides crank (4) central siphon, it is characterized in that central siphon two ends installation bearing (3) back-up ring (2) oil sealing (6) outside installation shaft skins (7).

2, a kind of later-model bicycle middle shaft according to claim 1 is characterized in that central siphon (4) end mounted bearing (3) diameter≤sprocket wheel (5) tooth root circle d _RootDiameter.