CN219467925U

CN219467925U - Oval toothed disc bicycle drive arrangement that laborsaving comfortable rides

Info

Publication number: CN219467925U
Application number: CN202223268258.9U
Authority: CN
Inventors: 彭伊祯; 彭连林
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-08-04
Anticipated expiration: 2032-12-07

Abstract

An elliptic toothed disc bicycle driving device which is labor-saving and comfortable to ride comprises an elliptic toothed disc, a right crank, a right pedal, a middle shaft, a chain wheel, a flywheel, a left pedal and a left crank; compared with a common bicycle, the bicycle is labor-saving during riding, is easy to tread, can quickly pass through the area difficult to tread after the bicycle is easy to tread in the area difficult to tread at the highest point or the lowest point, further improves the tread frequency, further improves the speed of the bicycle, and further overcomes the defects of the common oval chain wheel bicycle that the bicycle is easy to lose the chain due to inattention and heavy weight and shake of the chain during tread.

Description

Oval toothed disc bicycle drive arrangement that laborsaving comfortable rides

Technical Field

The utility model relates to the technical field of bicycles, in particular to an oval toothed disc bicycle driving device which is labor-saving and comfortable to ride.

Background

When the bicycle is ridden, the force of stepping on the pedal by the foot is decomposed into two forces, the direction of the first component force is the tangential direction of the circumferential rotation of the pedal, and the force drives the bicycle to run and is a useful force; the direction of the component II is consistent with the straight line where the crank is positioned, and the force can not drive the bicycle to run and is not a useful force; the same pedal force is used, and when the pedal is near the highest point or the lowest point, the obtained useful force is smaller, and the useless force is larger. Therefore, the conventional bicycle has the disadvantages that when the pedal is operated to the highest point or the vicinity of the lowest point, the pedal force of the foot is large, so that the thigh muscle is painful, the speed of the bicycle is slow, and the climbing of the slope is difficult.

In order to solve the problems of the traditional bicycle, an oval toothed disc bicycle is invented in the 90 th century, a round toothed disc is abandoned, and other parts and structures are not different from those of the traditional bicycle by adopting the oval toothed disc. To date, companies such as a rotor have been producing such oval dental tray bicycles. The structure of the oval toothed disc is characterized in that the mounting direction of the crank is consistent with the straight line direction of the short shaft of the oval toothed disc, and the principle is that when the pedal runs to the highest point or the lowest point, the toothed disc drives the bicycle to drive by using the teeth at the short shaft end, namely, the toothed disc with small diameter drives the bicycle to tread easily when the pedal is at the highest point or the lowest point of difficult force, so that the bicycle can quickly pass through the difficult force area; when the pedal is operated to the horizontal position, the long shaft of the toothed disc is perpendicular to the ground, the toothed disc drives the bicycle to drive by the teeth at the long shaft end, and the bicycle is fast in speed, namely, the toothed disc is driven by the toothed disc with large diameter to drive the bicycle fast when the pedal is operated to the region which is easy to be forced and trampled near the horizontal position. The oval chain wheel solves the problem that the pedal force of the foot is larger when the pedal of the traditional bicycle is at the highest point or the lowest point, but the oval chain wheel also has the problems that the pedal is neglected and heavy, the pedal is deeply and shallowly, the chain is neglected and loose, the chain is easy to fall off, and riding is uncomfortable.

For convenience of description, the circular treading track of the pedal is divided into 12 nodes according to the positions of the integral time points of the clock, each node is sequentially defined as 1 point to 12 points according to the clockwise rotation direction of the clock pointer, and the forward running direction of the bicycle is taken as the front.

The method comprises the following steps of analyzing the cause of the phenomenon that a common oval dental disk bicycle is in a step-on feeling and is inattentive when riding, wherein the cause of the phenomenon of step-on is: referring to fig. 2, when the pedal rotates from 12 points to 3 points, there are two factors that overlap each other to affect the pedaling force: firstly, the meshing point C of the oval toothed disc and the chain gradually moves towards a direction away from the central point, which is equivalent to the gradual increase of the diameter of the oval toothed disc, so that the treading force is gradually increased; secondly, when the pedal rotates from the 12 point to the 3 point, the meshing point C of the elliptic tooth disc and the chain gradually moves to a direction far away from the center point to cause the chain AC section to gradually increase, and when the pedal rotates to the 3 point, the length of the chain AC section reaches the maximum, namely the AD section in the figure, the increase of the chain causes the increase of the angular speed of flywheel rotation, and a rider is required to provide larger stepping force. When the two factors are overlapped, the traditional bicycle simply adopts the oval toothed disc, except that the pedal is labor-saving at 12 points, the rotational angular speed of the flywheel is increased at 12-3 points, particularly at 1-3 points, due to the gradual increase of the AC section of the chain, and the effective diameter of the oval toothed disc is gradually increased, so that the treading force is larger due to the overlapping of the two factors; when the pedal rotates from the 3 point position to the 6 point position, the AD section of the chain gradually approaches to the AC, the chain gradually shortens, the rotation angle speed of the flywheel is reduced, a rider can tread easily at the AD section, and the phenomenon of tread-on is generated to a certain extent, so that the phenomenon of tread-on is caused.

Common oval chain wheel bicycle, chain shake, easy reason analysis of falling the chain: the common elliptic tooth disc is generally positive and negative 2-4 teeth and is more positive and negative 2 teeth. The term is explained by taking positive and negative 2 teeth as an example: the semi-minor axis of the elliptic tooth disc is used as a radius to manufacture the circular tooth disc, and the tooth number of the circular tooth disc is 2 teeth less than the tooth number of the elliptic tooth disc, namely negative 2 teeth; the tooth disk is made by taking the semi-major axis of the ellipse as the radius, and the tooth number of the tooth disk is 2 teeth more than that of the ellipse tooth disk, namely, the positive 2 teeth. When the flywheel teeth number is 13 teeth, the oval tooth disc teeth number is 48, 50, 52, 54, 56, 58, 60 teeth and the positive and negative teeth number is 4 teeth, and the calculated tightness variation of the chain AC section is 2.82, 2.98, 3.13, 3.28, 3.44, 3.59, 3.74mm. The larger variation of the tightness of the chain is the reason for causing the shake of the chain and easy chain dropping.

Therefore, a bicycle driving device is needed in the industry, which can solve the problems of larger pedaling force and difficult force generation of a common bicycle when the pedal is at the highest point or the lowest point, and can overcome the defects of the oval toothed disc at the same time.

Disclosure of Invention

The utility model aims to provide an elliptical chain wheel bicycle driving device which is labor-saving and comfortable in riding, can overcome the problems of large stepping force and difficult force generation when a pedal is at the highest point or the lowest point during riding, and can also overcome the problems of light negligence, loose and tight chain negligence and easy chain dropping when the elliptical chain wheel bicycle is stepped.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an elliptic toothed disc bicycle driving device which is labor-saving and comfortable to ride comprises an elliptic toothed disc, a right crank, a right pedal, a middle shaft, a chain wheel, a flywheel, a left pedal and a left crank; the middle shaft, the chain wheel and the flywheel are arranged on a frame of the bicycle; the bicycle is characterized in that a bicycle forward running direction is taken as the front, a left pedal is arranged on a left crank, the left crank is arranged on the left side of a center shaft, a right pedal is arranged on a right crank, and the right crank is arranged on the right side of the center shaft; the oval dental tray is arranged on the center shaft; the chain is connected with the oval chain wheel, the chain wheel and the flywheel.

The driving device of the elliptic toothed disc bicycle is labor-saving and comfortable to ride, and the left pedal or the right pedal is rotated to enable the left crank and the right crank to be perpendicular to the ground, and the meshing point B is above or in front of a straight line which passes through the short axis end point above or in front of the elliptic toothed disc and is parallel to the long axis.

The oval toothed disc bicycle driving device capable of saving labor and being comfortable to ride is provided with a rear poking device.

Advantageous effects

The utility model has the following advantages:

the driving device of the elliptic dental disk bicycle, which is labor-saving and comfortable in riding, has the following advantages: first, it is laborsaving, when the running-board reaches the highest point or the lowest point, trample and be light, laborsaving than traditional bicycle to in whole trample in-process, trample the power more tends to invariable. Secondly, the speed of the vehicle is high, after the vehicle is trampled easily in the section with the highest point or the lowest point with difficult force, the vehicle can quickly pass through the area with difficult force, so that the trampling frequency is improved, and the speed of the vehicle is further improved. Thirdly, the defects of chain shake, easy chain drop and neglected feeling during pedaling of the common oval chain wheel bicycle are thoroughly overcome.

Drawings

FIG. 1 is a schematic illustration of the present utility model;

FIG. 2 is a schematic diagram of a generic elliptical dental disk drive apparatus;

FIG. 3 is a schematic analysis diagram of the present utility model;

the reference numerals in the drawings are respectively as follows: 1. the device comprises an elliptic tooth disc, 2, a right crank, 3, a right pedal, 4, a middle shaft, 5, a chain, 6, a sprocket, 7, a rear shift, 8, a flywheel, 9, a left pedal, 10, a left crank, A, an engagement point on the tangent point of the flywheel and the chain, B, an engagement point on the tangent point of the right chain of the sprocket and the right chain of the sprocket, C, an engagement point on the tangent point of the elliptic tooth disc and the chain, and D, an engagement point on the tangent point of the elliptic tooth disc and the chain after rotation.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

The utility model relates to an elliptical toothed disc bicycle driving device which is labor-saving and comfortable to ride, comprising an elliptical toothed disc 1, a right crank 2, a right pedal 3, a middle shaft 4, a chain 5, a chain wheel 6, a flywheel 8, a left pedal 9 and a left crank 10; in order to meet the speed changing requirement of the bicycle, a plurality of tooth plates with different diameters can be arranged on the flywheel; the rear shift 7 is used for shifting the chain to realize the speed change function.

The utility model relates to an elliptic toothed disc bicycle driving device which is labor-saving and comfortable to ride, wherein an engagement point B of a chain wheel 6 is above or in front of a straight line which passes through the upper or front short axis end point of an elliptic toothed disc 1 and is parallel to the long axis. Preferably, the engagement point B of the sprocket is optimally on the upper end tangent line parallel to the minor axis when the crank is perpendicular to the ground, among the plurality of tangent lines passing through the circular locus formed by the rotation of the end points of the major axis of the oval tray. The chain wheel is arranged between the middle shaft and the flywheel, and can also be arranged above the middle shaft, and different installation positions belong to the protection scope of the utility model.

The utility model relates to an oval dental disk bicycle driving device which is labor-saving and comfortable in riding, and the principle is analyzed:

in fig. 3, when the left pedal rotates from 12 points to 3 points, the meshing point C of the oval toothed disc and the chain gradually moves to the outside of the offset center, and the length of the chain BC segment becomes shortest when the left pedal rotates to 3 points, namely, the BD segment in the figure, the gradual shortening of the chain BC causes the reduction of the angular speed of flywheel rotation, and the pedaling force required to be provided is reduced. When the left pedal rotates from the 3 point position to the 6 point position, the BD section of the chain gradually approaches to the BC, the chain gradually increases to cause the rotation angular velocity of the flywheel to increase, a rider is required to provide larger stepping force, and the stepping force required to be provided by the 3-5 point positions is greater than 1-3 point positions. The 3-5 points are the regions where the thighs are most likely to exert force, and the force exerting mode accords with the functions of the thighs, so that a rider can exert force easily and riding is comfortable. Meanwhile, the pedal is required to provide a stepping force which is larger than 1-3 points in the 3-5 point interval, so that the phenomenon of stepping on the foot is avoided.

Principle analysis for large chain tightness variation is solved: the distance between the flywheel shaft and the center shaft of the 20 inch bicycle is 400mm, the flywheel is 13 teeth, the oval tooth disc is 56 teeth and the positive and negative teeth number is 4 teeth, and the example analysis is carried out. The bicycle of the above parameters, the tension variation of the chain AC section in FIG. 2 is 3.44mm. The novel bicycle with the same parameters is provided with the chain wheel 6, the horizontal line where the meshing point B of the chain wheel is positioned is overlapped with the horizontal line where the highest point of the circular track formed by rotation of the long axis of the oval tooth disc is positioned, and the distance between the vertical center line of the chain wheel 6 and the vertical center line of the center point of the oval tooth disc is 200mm for example analysis, as shown in fig. 3, the calculation shows that the chain tightness variation of the BC section in fig. 3 is 0.65mm, namely the tightness variation of the AC section of the chain in fig. 3 is 0.65mm and is far less than 3.44mm, and the phenomenon that the chain tightness variation is large when the traditional bicycle simply adopts the oval tooth disc is solved.

Claims

1. An oval dental disk bicycle drive arrangement that laborsaving comfortable rides, its characterized in that: comprises an oval toothed disc (1), a right crank (2), a right pedal (3), a middle shaft (4), a chain (5), a chain wheel (6), a flywheel (8), a left pedal (9) and a left crank (10); the middle shaft, the chain wheel and the flywheel are arranged on a frame of the bicycle; the bicycle is characterized in that a bicycle forward running direction is taken as the front, a left pedal is arranged on a left crank, the left crank is arranged on the left side of a center shaft, a right pedal is arranged on a right crank, and the right crank is arranged on the right side of the center shaft; the oval dental tray is arranged on the center shaft; the chain is connected with the oval chain wheel, the chain wheel and the flywheel.

2. The effort-saving and comfortable oval-shaped dental disk bicycle driving device for riding as claimed in claim 1, wherein: the left pedal (9) or the right pedal (3) is rotated so that the left crank (10) and the right crank (2) are perpendicular to the ground, and the engagement point B is above or in front of a straight line passing through the upper or front short axis end point of the oval dental tray (1) and parallel to the long axis.

3. The power saving and comfortable elliptical dental disc bicycle drive of claim 2, wherein: the driving device of the oval dental disk bicycle which is labor-saving and comfortable in riding is provided with a rear poking (7).