CN2557407Y

CN2557407Y - Bicycle with automatic extensible crank

Info

Publication number: CN2557407Y
Application number: CN02239848U
Authority: CN
Inventors: 彭启玩
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-12
Filing date: 2002-07-12
Publication date: 2003-06-25
Anticipated expiration: 2012-07-12

Abstract

The utility model relates to a bicycle with an automatic extensible crank, including an automatic extensible mechanism for crank. A drive gear wheel is arranged on the central shaft tube of the bicycle, and a driven gear wheel which is engaged with the drive gear wheel is arranged on a small central axle on a sprocket, a half gear wheel which is partially provided with teeth is arranged on the other end of the small central axle, the half gear wheel is positioned between the racks at the left and the right inner sides of the outside crank. The utility model adopts the transmission of the gear wheel and the racks to achieve the upward and downward automatic extension of the crank in a set distance; the crank is stretched when going upwardly, and the pedaling is labor-saving; the crank returns to the original length when going downwardly, so that the crank can not be contacted with the ground. Meanwhile, as the sprocket and the flying wheel are preserved the size, the labor is saved, while the speed is not reduced. The automatic extensible mechanism for crank can not only be applicable for a bicycle, but also suitable for a tricycle, a platform vehicle and other man power driven non-motorized vehicles.

Description

The automatic extension bicycle of crank

Technical field

The utility model relates to a kind of bicycle, relates in particular to a kind of bicycle with the automatic telescoping mechanism of crank.

Background technology

As everyone knows, the operation of bicycle is to drive chain wheel (chain drum) by human leg-driven by the chain wheel crank, drives flywheel through chain again, drives wheel rim by flywheel then and moves.Laborsaving saving time when riding in order to make, people have invented variable speed bicycle, by conversion chain wheel size, satisfy the needs of riding on level road or abrupt slope, and this really than the single speed bicycle further when the incision large toothed disk, can improve the speed of a motor vehicle, but the effort of riding; Ride laborsavingly though cut little chain wheel, the speed of a motor vehicle slows down, and does not therefore still have a kind of bicycle now and not only saves time but also laborsaving when riding.

The utility model content

Can not realize deficiency not only laborsaving but also that the speed of a motor vehicle is slowed down in order to overcome existing bicycle when riding, the utility model provides a kind of crank automatic extension bicycle, and this bicycle can make rides laborsavingly, does not slow down again.

The technical scheme that its technical matters that solves the utility model adopts is:

The automatic extension bicycle of a kind of crank has the automatic telescoping mechanism of a crank, and this mechanism comprises crank, chain wheel, axis and central siphon, and axis is installed in the central siphon, and crank and chain wheel are installed on the axis; One driving gear is installed on described central siphon, on chain wheel, open a hole, at this hole internal fixation a little axis is installed, end installation one and driving gear ingear driven gear at this little axis, at the other end of little axis half side gear is installed, the part of this one side of something top circle has tooth, remainder does not have tooth, the have toothed portion and the outside crank tooth bar of described half of gear mesh, described outside crank tooth bar has two, be installed in respectively outside crank about inboard, half of gear occupy between two tooth bars.

Be to be circular movement when people drive chain wheel to pedal with both feet, left foot must be following at last right crus of diaphragm, and vice versa.Adopt the automatic telescoping mechanism of crank, when the handle top when last, crank is extended on the original basis, and the chain wheel diameter of car is constant, and the increase of crank length certainly will make manpower save, and the size of chain wheel and flywheel does not change, so the speed of garage can not change yet.When the handle top in following time, crank returns to raw footage, makes it can not run into ground.By following tentative calculation, the utility model mechanism labour-saving is how much as can be known:

Press standard bicycle 38 teeth dishes, 180mm crank length, 16 tooth flywheels are that example is calculated:

1. 38 teeth dish diameters are 120mm, and its circumference is 120 * 3.14=376.8mm.

2. crank length 180mm, its motion circle diameter is 360mm, its motion circumference is 360 * 3.14=1130.4mm.

3. crank length increases 60mm (or longer) by 180mm and becomes 240mm, and its motion circle diameter is 480mm, deducts the lower end and shrinks 60mm, and the actual diameter that utilizes of its motion circumference is 420mm, and its actual circumference that utilizes is 1318.8mm.

4. increase crank motion circumference 1318.8 length and deduct former crank motion circumferential length 1130.4 and equal 188.4mm, equal 60mm divided by 3.14 again.Be and increase the long 60mm of crank circular movement diameter more former crank circular movement diameter.

5. 38 teeth dish diameters are that 120mm deducts and increases diameter 60mm and equal 60mm.That is: increase 60mm on former crank 180mm basis, equaling diameter is that the 38 teeth dishes of 120mm dwindle 50%, equals to act on the power that the power that increases on the 60mm crank acts on the former crank and enlarges 50%.Equaling utilization lengthening crank can be laborsaving, and laborsaving size is determined by increasing length.

Or: to increase 60mm is example: the circumference 188.4 of growth diameter 60mm equals 0.5 divided by the circumference 376.8mm of 38 teeth dish diameter 120mm, is 50%.

The beneficial effects of the utility model are: manpower is by bike saved, and the speed of a motor vehicle can not slow down.

Description of drawings

Fig. 1 is the schematic perspective view of the automatic telescoping mechanism of crank in the utility model

Among the figure, 1. chain wheel 2. cranks 3. axis 4. central siphons

5. driving gear 6. driven gears 7. little axis

8. half of gear 9. outside crank tooth bars

The specific embodiment

The automatic telescoping mechanism of one crank is housed in the automatic extension bicycle of the utility model crank, Figure 1 shows that the embodiment of the automatic telescoping mechanism of this crank, in this embodiment, chain wheel 1 and crank 2 are installed on the axis 3, outside the axis 3 central siphon 4 is housed, a driving gear 5 is installed on central siphon 4.On chain wheel 1, have a hole, at this hole internal fixation a little central siphon is installed, little axis 7 is housed in this little central siphon, end installation one and driving gear 5 ingear driven gears 6 at this little axis 7, at the other end of little axis 7 half side gear 8 is installed, the part of these one side of something gear 8 cylindricals has tooth, and remainder does not have tooth, and the arc length that toothed portion is arranged of half of gear 8 is the distance of the crank for extension that sets.The have toothed portion and the outside crank tooth bar 9 of half of gear 8 mesh.This outside crank tooth bar 9 has two, be installed in respectively outside crank about inboard, half of gear 8 occupy between two tooth bars.

The working process of the automatic extension bicycle of the utility model crank is as follows: when acting on pin on the crank when driving the chain wheel running, because little axis is fixed among the chain wheel, the running of chain wheel forces the driven gear rotation that is installed in little axis one end, because driven gear and the driving gear engagement that is fixedly mounted on the central siphon, driving gear is a fixed gear wheel, do not rotate with axis, therefore driven gear is that the center of circle with driving gear is that the center of circle rotates around driving gear, and the running of little axis simultaneously also drives the half of gear operation that is contained in the little axis other end.The toothed portion in running condition drive left side tooth bar that has in the half of gear moves downward, after arriving the distance of setting, half of gear forwards anodontia part to, then making it to break away from left side tooth bar dallies, through after the idle running of setpoint distance, the toothed portion that has of half of gear is cut the right tooth bar again, drives the right tooth bar upward movement, and the outside crank that two tooth bars are housed is pumped by setpoint distance.Little axis, half of gear and crank are that the center of circle rotates around axis with the axis axle center with driven gear together also simultaneously, thereby make strength of one's legs when driving chain wheel drive flywheel makes the bicycle operation, driving associated gear and tooth bar is again undertaken flexible automatically up and down by outside crank by setpoint distance, when crank extended when last automatically, to save manpower, crank recovers raw footage in following time, makes it can not run into ground to pedal the time.

The automatic telescoping mechanism of crank in the utility model also can be installed in three-wheel vehicle, flat truck etc. by on the manually driven unpowered vehicle not only applicable to being installed on the bicycle.

Claims

1, the automatic extension bicycle of a kind of crank is characterized in that: described bicycle has the automatic telescoping mechanism of a crank, and this mechanism comprises crank, chain wheel, axis and central siphon, and axis is installed in the central siphon, and crank and chain wheel are installed on the axis; One driving gear is installed on described central siphon, on chain wheel, open a hole, at this hole internal fixation a little axis is installed, end installation one and driving gear ingear driven gear at this little axis, at the other end of little axis half side gear is installed, the part of this one side of something top circle has tooth, remainder does not have tooth, the have toothed portion and the outside crank tooth bar of described half of gear mesh, described outside crank tooth bar has two, be installed in respectively outside crank about inboard, half of gear occupy between two tooth bars.

2, the automatic extension bicycle of crank according to claim 1 is characterized in that: the arc length that toothed portion is arranged of described half of gear is the distance of the crank for extension that sets.

3, the automatic extension bicycle of crank according to claim 1 is characterized in that: a little central siphon is housed outside described little axis.