CN2365128Y - Speed-change device within two-stage for bicycle - Google Patents

Abstract

The utility model relates to a speed-change device within two-stage for a bicycle, comprising a centre shaft (2). The utility model is characterized in that an eccentric steel bowl (3), an end-surface small gear (21), a chain wheel (10), a speed-change slide sleeve (13) and an end-surface big gear (15) are orderly arranged on the centre shaft (2) from left to right. The speed-change device within two-stage for bicycle of the utility model has large speed difference and convenient change-speed operation when the bicycle climbs slopes, and the utility model can be used on weighting bicycles as well as is also suitable for man-power tricycles.

Description

Bicycle two class internal speed variators

The utility model relates to a kind of manpower transportation, a kind of bicycle, and a kind of bicycle two class internal speed variators of more specifically saying so are applicable on bicycle or the three-wheel vehicle.

The existing employed change-speed box of bicycle can be divided into two big classes by its structure: the one, adopts the outer change-speed box of tower wheel construction design-calculated (be commonly called as three fly outward or five outside fly), the 2nd, utilize the internal speed changer of planet speed-change principle design.The former need use group chain device that chain is on the different wheel sheets, and conversion transmission stroke reaches the purpose of speed change, and during work, sprocket piece and flywheel sheet be not in same plane, and the gear teeth are sprained disconnected easily, also fall chain or slot easily; Latter's module of gear is very little, damages easily, and mechanism's complexity, cost is higher, is difficult to be extensive use of.In addition, the speed difference of existing each grade of bicycle speed-varying unit is all very little, so climbing the time will be carried out repeatedly speed change.

In view of there is above-mentioned deficiency in prior art, the purpose of this utility model provides a kind of new bicycle two class internal speed variators, and this change-speed box speed difference is big, and module of gear is big, not only can be used for increasing the weight of also being applicable on the manual tricycle on the bicycle.

The utility model realizes that the above-mentioned purpose technical solution is as described below:

A kind of bicycle two class internal speed variators, comprise axis, it is characterized in that being provided with eccentric steel bowl, end face miniature gears, sprocket wheel, speed change sliding sleeve and end face big gear wheel on the axis from left to right successively, the center of described end face miniature gears is provided with ratchet, by being provided with very heavy topping bracket and axis key connecting; The wheel body of sprocket wheel is crown, is bearing on the eccentric steel bowl by steel ball, and the post tooth is all established in the left and right sides of sprocket wheel, connects with the end face miniature gears on the left side and the end face big gear wheel on the right respectively; Be provided with the speed change sliding sleeve between sprocket wheel and the end face big gear wheel, the speed change sliding sleeve is provided with exit skirt to the right; The center of the end face big gear wheel that the sprocket wheel right side is set is provided with ratchet, connect with axis by being provided with the very heavy speed change topping bracket of speed change, the very heavy left side of described speed change is provided with the projection that puts in the exit skirt set on the speed change sliding sleeve, the speed change sliding sleeve is provided with the control pull rod that runs through wheel body and eccentric steel bowl, is with retracing spring on the control pull rod.

The utility model is the following outstanding advantage of technology tool now:

1. module of gear greatly not only can be used for increasing the weight of on the bicycle, also is applicable on the manual tricycle;

2. the speed difference is big, and variable speed operation is convenient during climbing;

3. be located on the bicycle middle shaft to be used and form multistage change bicycle with existing outer change-speed box.

Below in conjunction with drawings and Examples the utility model is explained in further detail,, grasps better and implement technological means of the present utility model so that the public fully understands technical solution of the present utility model.

Fig. 1 is the structural representation of a specific embodiments of the present utility model;

Fig. 2 makes the state of the set ratchet disengagement in speed change very heavy 16 and end face big gear wheel 15 centers for speed change sliding sleeve 13 among Fig. 1 is inserted in speed change very heavy 16;

Fig. 3 is that speed change sliding sleeve 13 is thrown off the state of the ratchet engagement that speed change very heavy 16 and end face big gear wheel 15 centers are set with speed change very heavy 16 among Fig. 1;

Fig. 4 is a partial view among Fig. 1, demonstrates the mode of operation that speed change sliding sleeve 13 is inserted in speed change very heavy 16 among the figure.

Referring to Fig. 1 and Fig. 4, present embodiment is to increase the weight of bicycle two class internal speed variators in one, the right head of axis 2 is established spline, the spline position is provided with eccentric steel bowl 3, end face miniature gears 21, sprocket wheel 10, speed change sliding sleeve 13 and end face big gear wheel 15 from left to right successively, the center of described end face miniature gears 21 is provided with ratchet, by being provided with very heavy 20 topping bracket 19 and axis 2 key connecting; The wheel body 12 of sprocket wheel 10 is crown, is bearing on the crown eccentric steel bowl 3 by steel ball 11, and it is bell that both make-ups get up to be, end face miniature gears button within it, the post tooth is all established in the left and right sides of sprocket wheel 10, connects with end face steamboat 21 and end face big gear wheel 15 respectively; Be provided with speed change sliding sleeve 13 between sprocket wheel 10 and the end face big gear wheel 15, speed change sliding sleeve 13 is provided with exit skirt to the right; The center of the end face big gear wheel 15 that sprocket wheel 10 right sides are set is provided with ratchet, by the speed change topping bracket 18 and axis 2 key connecting that is provided with speed change very heavy 16, the left side of described speed change very heavy 16 is provided with and can puts in bell-mouthed projection set on the speed change sliding sleeve 13, speed change sliding sleeve 13 is provided with the control pull rod 8 that runs through wheel body 12 and eccentric steel bowl 3, is with retracing spring 14 on the control pull rod 8.

Referring to Fig. 1, steel ball 11 is by between the silk retaining 9 fixing eccentric steel bowls 3 and wheel body 12 that are screwed onto in the wheel body 12; Eccentric steel bowl 3 is bearing on the axis 2 by steel ball 4; Topping bracket 19 leans against on the middle axle bumper 5; Wire drawing 7 is fixed on the control pull rod 8 by screw 6; The right side of end face big gear wheel 15 is provided with dust boot 17; Axis 2 is located in the center tap 22 of vehicle frame.

Referring to Fig. 1 and in conjunction with Fig. 2, Fig. 3 and Fig. 4, during Reduced Speed Now, retracing spring 14 pushes away speed change sliding sleeve 13 right sides, under bell-mouthed effect set on the speed change sliding sleeve 13, speed change very heavy 16 is inwardly drawn the ratchet disengagement (Fig. 3 and shown in Figure 4 state) set with the center of end face big gear wheel 15 in, step foot-operatedly with the person, drive axis 2 by crank 1 and rotate, drive sprocket wheels 10 by topping bracket 19, very heavy 20, end face miniature gears 21 again and rotate (end face big gear wheel 15 also follow sprocket wheel rotate synchronously) at this moment; When needing cruising, spur speed change sliding sleeve 13 left by steering unit set on the car, speed change wire drawing 7, control pull rod 8, speed change very heavy 16 is opened the ratchet engagement set with the center of end face big gear wheel 15 (state shown in Figure 2), step foot-operated with the person, driving axis 2 by crank 1 rotates, very heavy 16 by speed change topping bracket 18, speed change again, end face big gear wheel 15 drives sprocket wheels 10 and rotates, at this moment, although axis 2 also drives topping bracket 19 and rotates, but it is very heavy 20 that the rotating speed of wheel body 12 by the post cingulum moved end face miniature gears 21 in left side is higher than, and very heavy 20 is inoperative.

Claims (1)

1. bicycle two class internal speed variators, comprise axis (2), it is characterized in that being provided with successively from left to right on the axis (2) eccentric steel bowl (3), end face miniature gears (21), sprocket wheel (10), speed change sliding sleeve (13) and end face big gear wheel (15), the center of described end face miniature gears (21) is provided with ratchet, topping bracket of very heavy by being provided with (20) (19) and axis (2) key connecting; The wheel body (12) of sprocket wheel (10) is crown, is bearing on the eccentric steel bowl (3) by steel ball (11), and the post tooth is all established in the left and right sides of sprocket wheel (10), connects with the end face steamboat (21) on the left side and the end face big gear wheel (15) on the right respectively; Be provided with speed change sliding sleeve (13) between sprocket wheel (10) and the end face big gear wheel (15), speed change sliding sleeve (13) is provided with exit skirt to the right; The center of the end face big gear wheel (15) that sprocket wheel (10) right side is set is provided with ratchet, by the speed change topping bracket (18) and axis (2) key connecting that is provided with speed change very heavy (16), the left side of described speed change very heavy (16) is provided with the projection that can put in the upward set exit skirt of speed change sliding sleeve (13), speed change sliding sleeve (13) is provided with the control pull rod (8) that runs through wheel body (12) and eccentric steel bowl (3), is with retracing spring (14) on the control pull rod (8).

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