CN87209772U - Automatic 16 grades speed variator of bicycle - Google Patents

Abstract

The utility model relates to the improved and full automatic diameter regulating speed changer of the bicycle, which is arranged on the centre shaft of the bicycle. The automatic sixteen grades speed changer of the bicycle which is provided with sixteen equi-differential speed ratios is suitable for the requirement of the physical strength, and the primary and decelerating pedal force can be regulated. According to the changes of the riding resistance force, the diameter of the equivalent sprocket can be automatically changed through changing the pedal force, and accordingly, the speed ratio and the vehicle speed can be changed; the automatic sixteen grades speed changer of the bicycle can make the rider feel light and comfortable while riding on the flat ground, and the automatic sixteen grades speed changer of the bicycle can make the rider feel labor-saving and comfortable through automatic deceleration while climbing the slope, starting, or riding in the adverse wind. The utility model has the advantages of less parts, simple structure, light weight, compact structure, and large speed changing range; the equivalent gear number of the sprocket is 26 to 56, and the automatic sixteen grades speed changer of the bicycle which only needs to change over the ordinary centre shaft can be used for all kinds of the novel bicycles and the improved old type bicycles.

Description

Automatic 16 grades speed variator of bicycle

A kind of bicycle 16 fast full automaticity path transfer change-speed boxs belong to bicycle speed-varying unit.

The bicycle speed-varying unit great majority are used the hand shift speed change at present, and troublesome poeration is difficult to obtain speed ratio accurately, and driving efficiency is low.

The purpose of the present utility model provides a kind of improved full automaticity path transfer change-speed box, and the speed ratio with 16 kinds of equal difference can adapt to the needs of cyclist's muscle power, regulates the first pedal power that reduces speed ratio.Can adapt to the variation of riding resistance, change the diameter that pedal power just can change hinge wheel automatically naturally, thereby change the speed ratio and the speed of a motor vehicle, reach brisk, laborsaving, improve the efficient of muscle power.

The utility model be achieved in that with six radially groove move and the secter pat of not rotation is evenly distributed on the joint garden of a certain equivalent sprocket wheel, replace the common sprocket wheel of diameter unmodified.Wherein two secter pats have the gear teeth, play the chain sprocket drive effect, and all the other four do not have the gear teeth, only chain are play supporting role, and control speed change with cam mechanism, and the equivalent chain wheel diameter is changed.The radial position of six secter pats is decided by the radially intersection point of straight trough of cam curve slot and drive plate.Elastic positioner is installed on cam, corresponding with knock hole uniform on the drive plate circular arc, the fixing speed ratio after the speed change balance; The extension spring micromatic setting is installed, is regulated the initialization pulling force of reset tension spring.

Accompanying drawings concrete structure and variable-speed motion:

Fig. 1 is the change-speed box back view.Drive plate (1) is fixedly mounted on axis (3) and goes up, transmits crank moment, and six uniform radial slots are arranged, and 16 knock holees that are distributed on the arc of same garden are arranged, the corresponding speed ratio of each knock hole.Sliding shaft base (5) radially groove slides.

Fig. 2 is the change-speed box front view.Cam (9) has six uniform curved grooves, and sky is enclosed within on the axis (3); Its roller (7) and fan-shaped sprocket (2) or secter pat (4) are installed in the two ends of sliding shaft base (5) respectively.Reset tension spring (6) is contained on drive plate (1) and the cam (9).

Fig. 3 is the A-A cutaway view of elastic positioner on Fig. 2.Sleeve (10) is fixedly mounted on the cam (9), and stage clip (11) and lock ball (12) are housed in sleeve (10).

Fig. 4 reset tension spring micromatic setting figure.Post nail (14) is contained on the cam (9), and micrometer adjusting screw (13) is contained on the post nail (14), and reset tension spring (6) is fixed in the aperture of micrometer adjusting screw (13) end.The position of micrometer adjusting screw (13) after adjusting is fixing with captive nut (15).Regulate the initialization pulling force of reset tension spring according to cyclist's muscle power, thereby regulate the first pedal power that reduces speed ratio.

Fig. 5 is the change-speed box general assembly drawing.Transmission components (22) is installed on the axis (3) of vehicle frame (20).Annex is tensioner (17), is contained on the rear axle (16), only selects the flywheel (18) of a specific number of teeth for use.

When static, pedal moment are zero, or pedal moment is during less than particular value, and the equivalent chain wheel diameter is a maxim.Utilize the pulling force of the torsion spring of tensioner (17), when having only a fan-shaped sprocket (2) and chain engages transmission during speed change, make because of increasing and directly replenish or chain that tube reducing is reduced slips on secter pat (4) chain (19).Adopt two laterally zygomorphic fan-shaped sprockets (2), alternately transmit the moment of left crank (21) and right crank (8), chain drive-belt.

The level land smooth-ride, the riding resistance minimum makes the equivalent chain wheel diameter keep maxim by the suitable big reset tension spring (6) of rigidity, and transmitting ratio is a maxim.The cyclist controls pedal power and crank rolling velocity arbitrarily obtains comfortable, the brisk speed of a motor vehicle.

Upslope, starting or against the wind, riding resistance is very big, bigger pedal power is sent in requirement, when pedal moment greater than particular value, when overcoming the opposing torque of reset tension spring (6), fan-shaped sprocket (2) and secter pat (4) shrank along the radial slot on the drive plate (1) by sliding shaft base (5) while, reduced the equivalent chain wheel diameter, reduced speed ratio.Reduce resisting moment by the arm of force that reduces resisting moment, reach laborsaving, comfortable.Road slope is big more, requires pedal moment big more, and change-speed box alleviates automatically, reaches new balance, reduces to till the minimum equivalent chain wheel diameter always.

The slope that falls does not need to trample, and crank is static, and when the line of centers out of plumb road surface of two fan-shaped sprockets (2), under the effect of reset tension spring (6), cam (9) rotates, and the equivalent chain wheel diameter is restored to maxim.

This transmissions improved utility model patent " the full-automatic path transfer speed changer of bicycle ", the patent No. 85203809, adopt elastic positioner with the speed ratio of practicality by eight kinds of 16 kinds of expanding as equal difference, improve the accuracy and stability of speed ratio after the speed change. Adopt the reset tension spring micromatic setting, regulate the initialization pulling force of reset tension spring, adapt to the needs of muscle power, regulate the first pedal power that reduces speed ratio. The advantage that keeps former design patent, automatic speed-changing, the equivalent chain tooth number can fade to 56 teeth by 26, total few, simple in structure, tight Minato of number of components, easily processing, gross weight is lighter, and chain keeps a straight line transmission, efficient height.

This speed changer only need to change common axis and just can be installed on the various bicycles, selects the flywheel of the different numbers of teeth can obtain different slewing ranges. Be used for innovative car or improve old-fashioned car.

Claims (2)

1, a kind of bicycle 16 fast full automaticity path transfer change-speed boxs, belong to derailleur, drive plate (1) is arranged, cam (9), sliding shaft base (5), reset tension spring (6) and annex tensioner (17), six rollers (7) are housed on sliding shaft base (5) and form two fan-shaped sprockets (2) and four secter pats (4) of an equivalent sprocket wheel, the equivalent chain tooth number can fade to 56 teeth by 26, feature of the present utility model is that the elastic positioner that is installed on the cam (9) is arranged, with be distributed on 16 knock holees on the same circular arc of drive plate (1) and form the speed ratio of 16 kinds of equal difference, the reset tension spring micromatic setting is arranged, regulate the first pedal power that reduces speed ratio.

2, change-speed box according to claim 1 is characterized in that elastic positioner has sleeve (10), stage clip (11) and lock ball (12).

Images