CN102085898A - Bicycle booster - Google Patents

Abstract

The invention discloses a bicycle booster, which is a mechanical transmission device, is formed by deforming and then assembling a slider-crank mechanism, and belongs to the field of machinery manufacturing. In a power transmission system of a bicycle, the power of the bicycle is generated by generating a torsional moment through the rotation of a foot pedal connecting rod and a center shaft to ensure that the bicycle can move forwards. The torsional moment of the center shaft determines the movement speed of the bicycle. The torsional moment can be increased by only increasing the force moment, while the force moment is obtained by multiplying a force by an arm of force. More physical force is required to ride fast. In order to not only ride fast but also consume less physical force, only the length of the arm of force (the foot pedal connecting rod) is increased. However, limited by the structure of the bicycle, the arm of force (the foot pedal connecting rod) cannot be lengthened randomly, so in order to not only ride fast but also save labor, not only the length of a foot pedal connection rod cannot be increased but also the force of the foot pedal cannot be increased, and simultaneously a bigger force moment should be acquired. The bicycle booster can solve the difficult problem. The attached drawing 1 (above) shows that the bicycle booster can increase the torsional moment of the center shaft under the condition that the foot pedal connecting rod is not lengthened and the force of the foot pedal is not increased.

Description

Accelarators for bicycles

Technical field

Accelarators for bicycles is a kind of mechanical drive, is to constitute after the slider-crank mechanism distortion, to belong to mechanical manufacturing field.

Background technology

Existing single chain-drive power system of bicycle and relevant technologies data, in " Fundamentals of Machine Design " teaching materials such as " manufacturing technologies " about the chapters and sections of crank block transmission and cam drive and processing thereof.

Summary of the invention

In the power drive system of bicycle, the power of bicycle is to produce moment of torsion by foot-operated (pedaling) connecting rod and axis rotation, through chain sprocket drive moment of torsion is passed to flywheel again, produce the moment of torsion opposite at trailing wheel like this with axis, trailing wheel produces antagonistic force with ground again, and bicycle can be moved forward.Whether active and mobile the size of axis rotary torque with decision bicycle speed.Increase moment of torsion and have only increase moment, and moment takes advantage of the arm of force to obtain by power.Increasing foot-operated power shortens the arm of force simultaneously or reduces foot-operated power and the arm of force that extends can obtain same moment.Because the energy of bicycle is mainly provided by the people, what want to ride will consume one's strength soon, should ride to such an extent that physical demands is few again soon in order to solve, and that has only the length of the lengthening arm of force (foot-operated connecting rod).But because the structural limitations of bicycle, the arm of force (foot-operated connecting rod) is lengthening arbitrarily, and cyclist's shank stretching frequency also reduces along with the lengthening of the arm of force simultaneously.Want not only to ride soon but also can laborsavingly just need a mechanism to solve this difficult problem.Neither the length of the foot-operated connecting rod of lengthening does not strengthen foot-operated dynamics again, can obtain bigger moment simultaneously, and this mechanism is exactly an Accelarators for bicycles.Accompanying drawing 1 (on) be the structure principle chart of Accelarators for bicycles, this figure shows under the situation of foot-operated connecting rod and the foot-operated power of increase that do not extend, and also can increase the moment of torsion of axis.

Description of drawings

Accompanying drawing 1 (on) the figure shows the principle of work of servo-unit. wherein 1 is that the foot-operated connecting rod .2 of L type is that assisted pedal stroke arm .3 is that the connecting rod .4 of band ratchet is that stage clip .5 is that cam .6 is a ratchet.The interrelation of these parts is that L type connecting rod 1 is connected with bicycle middle shaft, and 1,2,3 is hinged (can be dynamically connected) each other.Left and right two figure of accompanying drawing 1 (descending) represent the servo-unit two states in when work respectively, and the assembly relation of the parts such as pull bar of pedal, power assistant arm, band ratchet.

Accompanying drawing 2 expression servo-units are around one week of axis left-hand revolution (0 °-360 °) time, and assisted pedal stroke arm and L type connecting rod and be with the pull bar of ratchet are at the interrelation of different angle positions and the servo-unit mode of operation at diverse location.

Specific embodiment

According to design drawing. detail drawing processes sample, structure shown in accompanying drawing 1 (descending), with standard bicycle, the structure of foot-operated (pedaling) son is compared, and power-assisted pedal has increased a power assistant arm and has been connected with pedal axle and pedal.The moment of torsion that relative motion produced of pedal and pedal connecting rod just can be delivered on the axis by the pull bar of band ratchet like this, the moment of torsion that made on the axis additive incrementation.The mode of operation that rotates a circle around axis of servo-unit as can be seen from accompanying drawing 2, when servo-unit ran to 1 position from 1 position by anticlockwise direction, promptly when 90 °-270 ° interval rotations, power assistant arm had been brought into play the effect that increases square.The size that increases square is by the length decision of power assistant arm, suppose that power assistant arm length is to ride 1/3 of length of connecting rod (from the pedal axle to axis), is exactly more than 30% in the moment that increases on the axis so.Move between this Rotary District on by anticlockwise direction at 270 °-90 ° in addition, servo-unit is not had an effect to axis, only the relative position between adjusting yoke, power assistant arm, the foot-operated connecting rod.Shrink at 270 ° of-360 ° these interval pull bars, and at 0 ° of-90 ° of these interval pull bar a turnover of being stretched by the change of contracting is arranged, this work is finished by a stationary cam t.Pull bar is pushed up from ratchet by cam t in this angular interval, and 1. pull bar is gone up capable of expansion and contraction at L type connecting rod like this.Can not transfer torque.When servo-unit forwarded 90 ° to, next power-assisted circulation had begun again.From accompanying drawing 2, can be clear that, the pull bar of band ratchet between 0 ° of-360 ° of Rotary District with respect to the foot-operated connecting rod of L type 1. ' 2. ' 3. ' flexible state, 90 ° of-180 ° of interval pull bars forward (left side) reach limiting length, at this moment power assistant arm and foot-operated connecting rod conllinear, i.e. the moment maximum that on axis, produces this moment.In 180 ° of-270 ° of intervals, pull bar begins to shorten, and still owing to the effect of ratchet on the pull bar and ratchet, people's sole pressure still can produce additional moment of torsion on power assistant arm, pass to axis by pull bar.

Claims (1)

1. Accelarators for bicycles is with after the slider-crank mechanism distortion, with a kind of new mechanism of bicycle pedals connecting rod assembly formation.This mechanism can make axis produce bigger moment of torsion, and have characteristics such as simple in structure, in light weight under the situation that does not increase foot-operated length of connecting rod.

1, in Accelarators for bicycles, foot-operated connecting rod 1 is dynamically connected with assisted pedal stroke arm 2.

2, the hinge (can be dynamically connected) of the pull bar 3 of assisted pedal stroke arm 2 and band ratchet in the servo-unit.

3, the L type structure of foot-operated connecting rod 1.

4, the structural relation of the pull bar 3 of band ratchet and the ratchet on L type connecting rod 16 and spring 4, stationary cam 5.

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