Method for overcoming power generation dead point of bicycle

Abstract

The invention discloses a method for overcoming a power generation dead point of a bicycle. A pedal device is mounted on the bicycle; the pedal device comprises a right crank, a left crank, a right pedal, a left pedal, a right half shaft, a left half shaft, a chain wheel, a driving first-order non-circular gear, a driven first-order non-circular gear, a driving circular gear, a driven circular gear and a through shaft; a driving structure of an existing bicycle is improved, a chain wheel is still used for driving a chain, a pair of first-order non-circular gears is installed in the driving structure, and rotating shafts of the first-order non-circular gears are arranged to deviate from the centers of the gears. The pedal plate on the other side is located at the 1 o'clock position in the clockwise direction, the force exerting positions of the pedal plates on the two sides perfectly avoid force exerting dead points of 12-1 o'clock positions, the positions of the force exerting points are located at the 1 o'clock position to the 6 o'clock position all the time, and therefore force exerting is reduced, and driving efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of bicycles, in particular to a method for overcoming the dead point of the bicycle. Background technique [0002] The trajectories of the left and right pedals of the bicycle are both a circle. For the convenience of description, the circular rotation trajectories of the left and right pedals are divided into 12 nodes according to the same viewing direction and according to the position of the integer time point of the clock; According to the clockwise rotation direction of the clock hand, each node is defined as 1 o’clock to 12 o’clock in turn; the left and right cranks of the existing bicycle are in the same plane, when the pedal on one side is turned to 6 o’clock, the other The side pedal is at 12 o'clock; when the foot steps on the pedal at 12 to 1 o'clock, according to the principle of force synthesis and decomposition, when the foot pedals, the pedal force is decomposed into two forces, one is along t...

AI Technical Summary

Problems solved by technology

[0002] The trajectories of the left and right pedals of the bicycle are both a circle. For the convenience of description, the circular rotation trajectories of the left and right pedals are divided into 12 nodes according to the same viewing direction and according to the position of the integer time point of the clock; According to the clockwise rotation direction of the clock hand, each node is defined as 1 o’clock to 12 o’clock in turn; the left and right cranks of the existing bicycle are in the same plane, when the pedal on one side is turned to 6 o’clock, the other The side pedal is at 12 o'clock; when the foot steps on the pedal at 12 to 1 o'clock, according to the principle of force synthesis and decomposition, when the foot pedals, the pedal force is decomposed into two forces, one is along the circumferential direction Tangential force, this force drives the crankshaft to rotate, thereby driving the bicycle, it is powerful; the other component force is along the direction of the crank, through the crank to squeeze the center shaft, this force does not drive the bicycle, it is useless force, the existence of this force , causing thigh muscle soreness, and when climbing or riding against the wind, it is difficult for the driver to output effective force, so there is a dead point of force between 12 and 1 o'clock, which eventually leads to difficulty in climbing

[0003] In order to eliminate the dead center of power, some prior art uses a heart-shaped gear surrounded by two Archimedes spirals to be installed on the bicycle; although the described heart-shaped gear can eliminate the top dead center, it also has a fatal disadvantages; such as figure 2 As shown, the X coordinate axis in the figure represents the forward direction of the bicycle, and the Y axis represents the height direction of the bicycle; a set of heart-shaped gears in the figure is installed on the right side of the bicycle, and when the right crank 3 is at 1 o’clock, step on The right pedal, the active heart-shaped gear 1 rotates clockwise, drives the passive heart-shaped gear 2 to rotate, the meshing point of the two gears gradually moves from point K to point Z, during this process, the effective radius of the active heart-shaped gear 1 gradually Increase, resulting in an increase in the rotational angular velocity of the passive heart gear 2; at this time, the left crank 4 rotates clockwise from 6 o’clock to 7 o’clock, and this process is accelerating; the meshing point moves from point Z to point O , the effective radius of the active heart gear 1 does not change greatly, that is, the angular velocity of the passive heart gear 2 does not change greatly, and the rotation speed of the left crank 4 does not change significantly; the meshing point moves from point O to point P In the middle, because the effective radius of the active heart-shaped gear 1 decreases sharply, the angular velocity of the passive heart-shaped gear 2 decreases sharply, giving people a feeling that the left pedal is suddenly stuck, and at the same time, the right pedal is suddenly stepped on the air. ;This position is near the horizontal position of the crank, and the horizontal position is the area with the largest driving force. At this time, the force is suddenly stepped on and cannot be exerted, resulting in low efficiency; when the meshing point moves from point P to point X, the active heart-shaped gear 1 The effective radius suddenly increases sharply, causing the passive heart gear 2 to suddenly increase sharply from the extremely low angular velocity, and finally causes the resistance to suddenly increase sharply after the right crank 3 crosses the 3 o'clock position

It can be seen that although the heart-shaped gear surrounded by two Archimedes spirals solves the problem of the dead point of force, its structure determines that it has the problems of uncomfortable pedaling and low driving efficiency, so the industry urgently needs it. A method capable of solving the problem of the dead point of the bicycle under the premise of ensuring the riding comfort of the bicycle and not reducing the driving efficiency

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