CN101654141B - Variable-speed bicycle driving mechanism driven by external-gearing planet gear chain - Google Patents

Abstract

The invention relates to a variable-speed bicycle driving mechanism driven by an external-gearing planet gear chain, comprising a central shaft (4) and a chain wheel (11) arranged on the central shaft, wherein a speed increasing device is also arranged on the central shaft. The variable-speed bicycle driving mechanism is characterized in that a variable-speed mechanism is arranged on the central shaft and comprises a connecting device, a fixed gear wheel (15), a chain wheel (11), an axial planet gear (12), planet gears (1) and (2), central wheels (3) and (7) and a variable-speed sleeve (6). The invention has the advantages that the variable-speed driving of the single-stage fixed chain wheel can be achieved; the driving ratio between a master chain wheel and an assistant chain wheel is increased, and the driving radiuses of the master chain wheel and the assistant chain wheel are respectively reduced and increased so as to achieve the functions of rapidness and portability; a rolling friction structure is considerably adopted in the relative motion among all components, and the power loss in the driving can be effectively reduced; and the variable-speed bicycle driving mechanism driven by the external-gearing planet gear chain is simple in structure and easy to process and manufacture.

Description

Variable-speed bicycle driving mechanism driven by external-gearing planet gear chain

Technical field:

The present invention relates to a kind of bicycle middle shaft driver train, especially a kind of variable-speed bicycle driving mechanism driven by external-gearing planet gear chain.

Background technology:

At present; Bicycle still is most Chinese people's a traffic means of transport; What the adult of production and sales for many years and child's bicycle still adopted is the speed change type of drive of single-stage chain-driving or change chain and the realization of sprocket engagement position; Axis directly is connected to form the driving driving member with sprocket wheel, and what adopt owing to it is the single-stage chain-driving, and the raising of its speed receives certain restriction; The structure somewhat complicated of change chain and sprocket engagement position realization multi-change speed and poor for applicability.

Summary of the invention:

The object of the invention is exactly in order to overcome the existing defective that single-stage chain-driving bicycle speed is immutable and propulsive effort is bigger; And a kind of variable-speed bicycle driving mechanism driven by external-gearing planet gear chain is provided; The driven at low speed power that can realize going up a slope is little, and the level road constance force drives the speed that drives than original design single-stage chain and obviously improves.

Technical scheme of the present invention:

Variable-speed bicycle driving mechanism driven by external-gearing planet gear chain: comprise axis and be arranged on the sprocket wheel on the axis, also be provided with boost installation on the axis, it is characterized in that:

A, axis are provided with three connecting devices, hub setting speed change cover on the axis, and speed change puts and is provided with and the corresponding connecting bore of connecting device, on the axis in the speed change cover outside, is provided with jam nut;

B, speed change put the hub setting sprocket wheel, and sprocket wheel endoporus circumference is provided with one group of connecting bore and cooperates with connecting device, upwards is provided with one group of equidistance axis hole in the footpath of sprocket wheel; Side at sprocket wheel is provided with one group of axle planetary wheel, and each planetary axle cooperates with cooresponding axis hole, the common and fixed gear wheel cover engagement of this group axle planetary wheel, and the fixed gear wheel cover constitutes revolute pair with axis, constitutes the low speed bicycle driving mechanism;

C, be provided with one group of planetary wheel one at the opposite side of sprocket wheel; Each planetary wheel one is captiveed joint with the planetary axle of cooresponding axle respectively; This group planetary wheel one common and sun gear one engagement; Sun gear one hub setting puts in speed change, and sun gear one endoporus circumference is provided with one group of connecting bore one and cooperates with connecting device, constitutes the middling speed bicycle driving mechanism;

D, be provided with a planetary wheel two in the series connection of the opposite side of each planetary wheel one; Each planetary wheel two is captiveed joint with the planetary axle of cooresponding axle respectively; These group planetary wheel two common and sun gear two engagements; Sun gear two hub settings put in speed change, and sun gear two endoporus circumference are provided with one group of connecting bore two and cooperate with connecting device, constitute the high-speed bicycle driver train.

On the basis of above-mentioned main technical schemes, can increase following further perfect technical scheme:

Described one group of axle planetary wheel can be two or more planetary wheels, and described planetary wheel one, planetary wheel two are identical with axle planetary wheel number.

Described three connecting devices; Axis axially on two adjacent connecting device spacing 5～25mm; The angle of its two adjacent connecting devices is 60～120 ° diametrically, and described connecting device is made up of silk spring, ratchet, and axis is provided with pawl slot; Be provided with deep gouge in the pawl slot, be provided with ratchet in the pawl slot and be connected with the interior silk spring of deep gouge; Described connecting device is by spring, radially feather key constitutes, and axis is provided with radially keyway, radially is provided with spring in the keyway and is connected with feather key radially.

The described speed change cover outside is provided with speed change and handles baffle plate.

Between sprocket wheel and axle planetary wheel, planetary wheel two, sun gear one, be provided with roller.

The relevant design of external toothing planetary wheel, chain-driving bicycle driving mechanism is calculated:

1, ordinary person's power is calculated roughly:

1), the ordinary person with the 65kg quality upstairs calculates: general stair one shoulder height is 180mm, establishes 1 second last step, and then ordinary person's power is:

P＝mgh/s＝65×9.8×0.18/1＝114.66W

2), drive bicycle crank arm one week measuring and calculating with ordinary person's both feet with fixed drive power: each half cycle propulsive effort of general left and right sides bipod is 250N---300N; If propulsive effort is big or small, direction is all constant and value 250N; Driving 1 by input changeed/1.5 seconds; Drive the arm of force and change with rotational angle, maximum is made as 0.2 meter, and ordinary person's power should be:

$P=\left(2{\∫}_{-\mathrm{\π}/2}^{\mathrm{\π}/2}\mathrm{Md\θ}\right)/s=\left(2{\∫}_{-\mathrm{\π}/2}^{\mathrm{\π}/2}\mathrm{FL}\cos \mathrm{\θd\θ}\right)/s=(2{\∫}_{-\mathrm{\π}/2}^{\mathrm{\π}/2}250\×\×0.2\×\cos \mathrm{\θd\θ})$

$/1.5=133.33W;$

Power P=120W by above two kinds of desirable ordinary persons of rough measuring and calculating.

2, the ride average driving moment M of bicycle of ordinary person calculates:

M＝p/w＝p·s/φ＝120.1.5/2π＝28.66N.m。

Disregard loss in efficiency, by the speed calculation of the design's overall gear ratio i=4.4: (promptly main the driving goed around, and bicycle rear changes 4.4 and changes)

V=26 * 25.4 * 3.14 * 40 * 4.4 * 60/1000=21.90km/h (reaching the national limited speed standard of battery-driven car).

3, three of the bicycle rear drive torque kinds of theory of computation checkings:

1), the rotational angular velocity of trailing wheel calculates:

ω＝4.4×6.28/1.5＝18.42rad/s；

2), the speed calculation at trailing wheel center:

V＝26×25.4×3.14×40×4.4×60/1000/3600＝6.08m/s。

3), the translation propulsive effort of bicycle calculates:

F＝P/V＝120/6.08＝19.72N。

4), the driving moment of couple of bicycle rear is calculated:

M＝F×R＝19.72×(26×25.4/2/1000)＝6.5N.m。

5), the driving moment of couple of bicycle rear method calculating in addition:

M＝P/ω＝120/18.42＝6.5N.m。

6), the calculating of the rolling resistance of bicycle rear idol square:

If ride people's quality 80Kg then the power of ground effects on two-wheeled should be 80 * 9.8N; Check in tire and ground-surface coefficient of rolling friction δ=2-10; Consider the unfavorable factor (the softer or underinflation of tire in road surface) of road surface and tire; Value δ=8, then two-wheel rolling resistance idol square M=80 * 9.8 * 10/1000=6.27N.m.

By 4), 5), 6) three kinds of method of calculating results are in full accord, explain that it drives design is fully feasible.

4, the design of module of gear: the transmitting ratio by the design's planet circular system is 4, and then the transmitting torque of this gear is 1/4 of an average driving moment---28.66/4=7.165N.m ascends the throne.

Machine design formula by modulus: $m\&GreaterEqual;12.1\sqrt[3]{\frac{{\mathrm{KT}}_1}{{\mathrm{\&Psi;}}_d{Z_1}^2}\&CenterDot;\frac{Y_F}{{\left[\mathrm{\&sigma;}\right]}_{\mathrm{<figure-callout\; id="3"\; label="F"\; filenames="H200910144889XE00011.png"\; state="\{\{state\}\}">F</figure-callout>}}}}=12.1\sqrt[3]{\frac{1.2\&times;7.165}{0.22\&times;{30}^2}\&CenterDot;\frac{2.53}{220}}=0.95\mathrm{Mm}$

Consider to get from the processing technology angle: m=1.5mm.

The invention has the beneficial effects as follows and to realize single-stage fixed chain wheels variable speed drive (VSD); The transmitting ratio of master and slave sprocket wheel is increased, and make master and slave chain wheel driving radius reduce respectively and increase, quick to realize, light function; Relative motion between each member is considered to adopt rolling friction structure, can effectively reduce the loss in efficiency in the transmission; External toothing epicyclic chain driving bicycle driving mechanism structure is simple, is easy to processing and manufacturing.

Description of drawings of the present invention:

Fig. 1 looks accompanying drawing for master of the present invention;

Fig. 2 is connecting device embodiment one of the present invention;

Fig. 3 is connecting device embodiment two of the present invention.

1. planetary wheels one among the figure, 2. planetary wheel two, and 3. sun gear one, 4. axis, 5. jam nut; 6. speed change cover, 7. sun gear two, 8. flat key, 9. screw, 10. speed change is handled baffle plate; 11. sprocket wheel, 12. planetary wheels, 13. needle bearings, 14. rollers, 15. fixed gear wheel covers; 16. feather key radially, 17. springs, 18. springs, 19. ratchets.

Embodiment one

As shown in Figure 1, variable-speed bicycle driving mechanism driven by external-gearing planet gear chain comprises axis 4; Axis is the step axle, and axle is provided with radially keyway of screw thread and three, two adjacent keyways axis axially on distance about 10mm arranged, diametrically 90 ° angle arranged; The radially feather key 16 that each radially is provided with a spring 17 and links to each other with spring in the keyway, speed change cover 6 of hub setting on the axis, speed change puts and is provided with three connecting bores that match with feather key radially; Speed change puts sprocket wheel 11 of hub setting, and sprocket wheel cooperates with speed change cover gap and can relatively rotate, and is as shown in Figure 2; Evenly being provided with eight connecting bores on the sprocket wheel endoporus circumference matches with feather key radially; On the isometrical circumference of sprocket wheel, evenly be provided with two axis holes, be provided with two axle planetary wheels 12 in sprocket wheel one side, each planetary wheel is provided with an axostylus axostyle and axis hole is connected through needle bearing 13; Two common and fixed gear wheel cover 15 engagements of axle planetary wheel; Fixed gear wheel is arranged with axial sleeve, and sleeve is provided with and bicycle bottom bracket bonded assembly hickey, and the fixed gear wheel cover passes through the ball normal-running fit with axis 4; Opposite side at sprocket wheel is provided with two planetary wheels 1; Each planetary wheel 1 is connected through flat key 8 with a planetary axostylus axostyle of axle respectively, two planetary wheel one 1 common and sun gear one 3 engagements, and sun gear one 3 hub settings put in speed change; Evenly being provided with eight connecting bores two on the sun gear one 3 endoporus circumference matches with feather key 16 radially; Planetary wheel 22 of opposite side series connection of each planetary wheel 1, this planetary wheel 22 is captiveed joint with flat key 8 through screw 9 with the axostylus axostyle of corresponding axle planetary wheel 12 respectively, two planetary wheel 22 common and sun gear 27 engagements; Sun gear 27 hub settings are on speed change cover 6; Sun gear 27 and speed change cover gap cooperates and can relatively rotate, and evenly is provided with eight connecting bores one on the sun gear 27 endoporus circumference and matches with feather key 16 radially, is provided with jam nut 5 on the axis outside speed change is overlapped; The speed change cover outside also is provided with speed change and handles baffle plate 10, and speed change is handled baffle plate 10 and is connected through screw retention with the speed change cover.

The speed-change process of variable-speed bicycle driving mechanism driven by external-gearing planet gear chain is: can make the speed change cover be in different circumferential positions through the foot-operated speed change manipulation baffle plate that rotates; So that the radially feather key of axis through diverse location on it and planetary wheel carrier, speed change cover or realize that with different sun gears, speed change cover interlocking is fixedly connected to form member to reach the speed change purpose; When handling baffle plate 10 with the foot-operated speed change of rotating; When making the radially feather key 16 that is in axis and speed change inner room embed in the connecting bore of sprocket wheels 11 is driven at low speed; Simultaneously, the radially feather key of other two positions is pressed into the radially keyway of axis by the speed change cover; Stepping on the moving speed change of walking around again is high-speed driving when handling in the connecting bore two that baffle plate makes radially feather key 16 embeddings one sun gear 27 that is in axis and speed change inner room for 90 °; Stepping on when changing speed and handling baffle plate and make for 90 ° the radially feather key 16 that is in axis and speed change inner room embed in the connecting bore one of another sun gears 1 once more is the middling speed driving.

Embodiment two

As shown in Figure 1, variable-speed bicycle driving mechanism driven by external-gearing planet gear chain comprises axis 4; Axis is the step axle, and axle is provided with screw thread and three place's pawl slots, is provided with a deep gouge in each pawl slot; Two adjacent pawl slots axis axially on distance about 15mm is arranged, diametrically 120 ° angle is arranged, be provided with ratchet 19 in the pawl slot and be connected with a silk spring 18 in the deep gouge, speed change of hub setting overlaps 6 on the axis; Speed change puts and is provided with three connecting bores that match with ratchet, and speed change puts sprocket wheel 11 of hub setting, and is as shown in Figure 3; Evenly being provided with four connecting bores on the sprocket wheel endoporus circumference matches with ratchet; On the isometrical circumference of sprocket wheel, evenly be provided with three axis holes, be provided with three axle planetary wheels 12 in sprocket wheel one side, each planetary wheel is provided with an axostylus axostyle and axis hole is connected through needle bearing 13; Three common and fixed gear wheel cover 15 engagements of axle planetary wheel; Fixed gear wheel is arranged with axial sleeve, and sleeve is provided with and bicycle bottom bracket bonded assembly hickey, and the fixed gear wheel cover passes through the ball normal-running fit with axis; Opposite side at sprocket wheel is provided with three planetary wheels 1; Each planetary wheel 1 is connected through flat key 8 with a planetary axostylus axostyle of axle respectively, three planetary wheel one common and sun gear one 3 engagements, and sun gear one 3 hub settings put in speed change; Sun gear 1 cooperates with speed change cover gap and can relatively rotate; Evenly be provided with four connecting bores two on the sun gear one 3 endoporus circumference and match with ratchet 19, planetary wheel 22 of opposite side series connection of each planetary wheel 1, this planetary wheel 22 is captiveed joint with flat key 8 through screw 9 with the planetary axostylus axostyle of corresponding axle; Three planetary wheel 22 common and sun gear 27 engagements; Sun gear 27 hub settings put in speed change, evenly are provided with four connecting bores one on the sun gear 27 endoporus circumference and match with ratchet, on the axis in the speed change cover outside, are provided with jam nut 5; The speed change cover outside also is provided with speed change and handles baffle plate 10, and speed change is handled baffle plate and is connected through screw retention with the speed change cover.

Between sprocket wheel and axle planetary wheel, planetary wheel one, sun gear one, be provided with roller 14.

The speed-change process of three fast external toothing planetary wheels, chain-driving bicycle driving mechanism is: can make the speed change cover be in different circumferential positions through the foot-operated speed change manipulation baffle plate that rotates; So that the ratchet of axis through diverse location on it and planetary wheel carrier, speed change cover or realize that with different sun gears, speed change cover interlocking is fixedly connected to form member to reach the speed change purpose; When handling baffle plate 10 with the foot-operated speed that changes; When making the ratchet 19 that is in 6 in axis 4 and speed change cover embed in the connecting bore of sprocket wheels 11 is driven at low speed; Simultaneously, the ratchet of other two positions is pressed in the pawl slot of axis by the speed change cover; When stepping on rotating speed and handle in the connecting bore two that baffle plate makes ratchet 19 embeddings one sun gear 27 that is in axis and speed change inner room for 120 °, be high-speed driving again; Stepping on when changing speed and handling baffle plate and make for 120 ° the ratchet 19 that is in axis and speed change inner room embed in the connecting bore one of another sun gears 1 once more is the middling speed driving.

The fixed gear wheel cover 15 of variable-speed bicycle driving mechanism driven by external-gearing planet gear chain is provided with axial sleeve; Sleeve is provided with and bicycle middle shaft sleeve bonded assembly outside thread interface; It is screwed be fixed on the axis socket end; The fixed gear wheel cover forms revolute pair with middle between centers; Pass through direct drive respectively, the different sun gears on sprocket wheel or the driving axis reach with its planet gear meshed member its motion are reached sprocket wheel, thereby through the difference fast driven advancing of the sprocket rotation on the chain drive bicycle rear with the realization bicycle.

Claims (8)

1. variable-speed bicycle driving mechanism driven by external-gearing planet gear chain comprises axis (4) and is arranged on the sprocket wheel (11) on the axis, also is provided with boost installation on the axis, it is characterized in that:

A, axis (4) are provided with three connecting devices (16), hub setting speed change cover (6) on the axis, and speed change puts and is provided with and the corresponding connecting bore of connecting device, on the axis in the speed change cover outside, is provided with jam nut (5);

B, speed change put hub setting sprocket wheel (11), and sprocket wheel endoporus circumference is provided with one group of connecting bore and cooperates with connecting device (16), upwards is provided with one group of equidistance axis hole in the footpath of sprocket wheel; Side at sprocket wheel is provided with one group of axle planetary wheel (12); Each planetary axle cooperates with cooresponding axis hole; Common and fixed gear wheel cover (15) engagement of this group axle planetary wheel, the fixed gear wheel cover constitutes revolute pair with axis, constitutes the low speed bicycle driving mechanism;

C, be provided with one group of planetary wheel one (1) at the opposite side of sprocket wheel; Each planetary wheel one is captiveed joint with the planetary axle of cooresponding axle respectively; This group planetary wheel one common and sun gear one (3) engagement; Sun gear one hub setting puts in speed change, and sun gear one endoporus circumference is provided with one group of connecting bore one and cooperates with connecting device, constitutes the middling speed bicycle driving mechanism;

D, be provided with a planetary wheel two (2) in the series connection of the opposite side of each planetary wheel one (1); Each planetary wheel two (2) is captiveed joint with the planetary axle of cooresponding axle respectively; These group planetary wheel two (2) common and sun gear two (7) engagements; Sun gear two (7) hub settings put in speed change, and sun gear two (7) endoporus circumference are provided with one group of connecting bore two and cooperate with connecting device, constitute the high-speed bicycle driver train.

2. variable-speed bicycle driving mechanism driven by external-gearing planet gear chain according to claim 1 is characterized in that: described one group of axle planetary wheel can be two or more planetary wheels (12).

3. variable-speed bicycle driving mechanism driven by external-gearing planet gear chain according to claim 2 is characterized in that: described planetary wheel one (1), planetary wheel two (2) are identical with axle planetary wheel (12) number.

4. variable-speed bicycle driving mechanism driven by external-gearing planet gear chain according to claim 1; It is characterized in that: described three connecting devices (16); Axis axially on two adjacent connecting device spacing 5～25mm, the angle of two adjacent diametrically connecting devices is 60～120 °.

5. according to claim 1 or 4 described variable-speed bicycle driving mechanism driven by external-gearing planet gear chain; It is characterized in that: described connecting device is by spring (18), radially feather key (17) constitutes; Axis is provided with radially keyway, radially is provided with spring in the keyway, and spring is connected with feather key radially.

6. according to claim 1 or 4 described variable-speed bicycle driving mechanism driven by external-gearing planet gear chain; It is characterized in that: described connecting device is made up of silk spring (19), ratchet (20); Axis is provided with pawl slot; Be provided with deep gouge in the pawl slot, be provided with ratchet in the pawl slot and be connected with the interior silk spring of deep gouge.

7. according to claim 1 or 3 described variable-speed bicycle driving mechanism driven by external-gearing planet gear chain, it is characterized in that: between sprocket wheel (11) and axle planetary wheel (12), planetary wheel one (1), sun gear one (3), be provided with roller (14).

8. variable-speed bicycle driving mechanism driven by external-gearing planet gear chain according to claim 1 is characterized in that: the speed change cover outside also is provided with speed change and handles baffle plate (10).

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