CN2318115Y

CN2318115Y - Light speed changing small tricycle

Info

Publication number: CN2318115Y
Application number: CN 97208883
Authority: CN
Inventors: 黎国康; 汤中材
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-28
Filing date: 1997-03-28
Publication date: 1999-05-12
Anticipated expiration: 2007-03-28

Abstract

The utility model relates to a small light speed-changing tricycle, comprising a tricycle frame, a saddle, a handle bar, a chain sprocket, a multi-stage flywheel, a chain shifting device, a pedal and a back wheel. The utility model is characterized in that a front supporting rod is connected with the lower part of the handle bar; the lower end of the front supporting rod is fixedly connected with a bearing sleeve in which a front shaft assembled with two bearings is sheathed; two small wheels are respectively at both ends of the front shaft; nuts and pins are arranged on the front shaft at the outer sides of the wheels. The small light speed-changing tricycle has small size, light weight, high running speed and safety.

Description

The little tricycle of light-duty speed change

The utility model relates to a kind of bicycle of modified form.

In the existing bicycle, be two wheel constructions, volume and weight are bigger, the structure of front fork comes off front axle easily, safety is not high, in addition, if wheel and car body size are less relatively, when being grown up by bike, then except that the speed of a motor vehicle is little, main be the gravity center of human body far above body gravity, the car wigwag motion, poor stability, dangerous; The nearest folding variable speed bicycle of the steamboat of invention, the loosening property that cooperates along with the increase of the speed of a motor vehicle and when folding, safety hazard is growing on and on.

The purpose of this utility model provides the little tricycle of light-duty speed change that a kind of volume is little, in light weight, the speed of a motor vehicle is higher, safe and reliable.

The purpose of this utility model is achieved in that in the driving device of bicycle, transmission system is housed, increase the transmitting ratio of sprocket wheel and flywheel, make the speed of a motor vehicle near or reach the speed of a motor vehicle of common big wheel bicycle, adopt the major part of high strength light weight material car, be connected with a front support rod under the car handlebar, be fixed with a bearing sleeve below the front support rod, a front axle that is equipped with two bearings is inserted in the sleeve, there are two small wheels to be installed on the two ends of front axle respectively, on the front axle in the outside of small wheels, nut, pin are installed, to prevent the small wheels loose or dislocation.

Front axle is middle thick, a thin stepped shaft in two ends, rotates synchronously in order to make axle and two small wheels, and preferably the chamfered edge processing is carried out at Zhou two; The pin-and-hole that the axle two ends have screw thread and allow mortise pin pass, front axle is between bearing sleeve closed end (end face in the middle of have the hole that allows front axle cross) and close small wheels, one band brake apparatus is installed, the steamboat at front axle two ends, have the corresponding centre hole of a shape, size and chamfered edge place, front axle two ends profile (along axis direction), wheel and front axle are rotated synchronously.

Said bearing sleeve is cylindrical, generally be that an end is semiclosed (having a hole that allows front axle pass in the middle of the end face), the other end is an open type, in screw thread is arranged, have a hollow nut to be used with it, after front axle is inserted in bearing sleeve, fastening nut, nut compresses bearing, and bearing compresses front axle, front axle compresses another bearing again, and bearing and the position of axle in sleeve are determined.

Front axle two little wheel diameters are 170mm～200mm, and the outer lateral extent of two steamboats is 180mm～220mm, and back wheel diameter is 350mm～450mm.

The utility model assembling is simple, change part is also simple, the gas leakage tire patching is very convenient, front axle two steamboats can be similar to regards a wheel as, turns round flexibly the structure that adopts front axle to be inserted in bearing sleeve, improved the safety of bicycle, adopt little three wheel structures, reduced the weight of car load, the stability when having improved by bike again greatly.

Fig. 1 is integral structure figure of the present utility model;

Fig. 2 is a front axle assembling scheme drawing of the present utility model.

Below in conjunction with accompanying drawing in detail an embodiment of the present utility model is described in detail:

As Fig. 1, shown in 2, vehicle frame 1, saddle 2, handlebar 3, sprocket wheel 4, multistage flywheel 5, derailleur 6, pedal 7, trailing wheel 8 is the same substantially with prior art, preceding wheel diameter is 180mm, back wheel diameter is 400mm, handlebar is connected with a front support rod 9 for 3 times, the front support rod lower end is fixed with a bearing sleeve 10, front axle 15 is fixed with a band brake apparatus 11 between a bearing sleeve and a steamboat 12, front axle 15 is that a mid diameter is φ 22mm, the two ends diameter is the stepped shaft of φ 20mm, axle two is a chamfered edge shape, at both ends φ 20mm place is with a bearing respectively, front axle is inserted in bearing sleeve with bearing, tighten with hollow nut 17, position in sleeve is determined with front axle and bearing, has a shape, size is tightened with nut 13 after being inserted in the front axle two ends respectively with two small wheels of the corresponding centre hole of front axle chamfered edge place profile (along axis direction), insert pin-and-hole with pin-14 again, prevent that nut 13 and small wheels 12 from getting loose.

Claims

1. little tricycle of light-duty speed change, comprise vehicle frame, saddle, handlebar, sprocket wheel, multistage flywheel, derailleur, pedal, trailing wheel, it is characterized in that being connected with under the handlebar (3) front support rod (9), the front support rod lower end is fixed with a bearing sleeve (10), a front axle (15) that is equipped with two bearings (16) is inserted in the sleeve, there are two small wheels (12) to be installed on the two ends of front axle respectively, on the front axle in the wheel outside, nut (13), pin (14) are installed.

2. according to the little tricycle of the said light-duty speed change of claim 1, it is characterized in that bearing sleeve is cylindrical, an end is semiclosed (end face in the middle of have a hole that allows front axle pass), and the other end is an open type, in screw thread is arranged, have a hollow nut (17) to be used with it;

3. according to the little tricycle of the said light-duty speed change of claim 1, it is characterized in that front axle (15) is middle thick, a thin stepped shaft in two ends, an axle two is a chamfered edge shape, has screw thread and pin-and-hole;

4. according to the little tricycle of the said light-duty speed change of claim 1, it is characterized in that front axle two steamboats (12) diameter is 170mm～200mm, distance is 180mm～220mm between the two small wheels outside, and trailing wheel (8) diameter is 350mm～450mm;

5. according to the little tricycle of the said light-duty speed change of claim 1, it is characterized in that front axle (15) is the stepped shaft of mid diameter φ 22mm, two ends diameter phi 20mm.