CN2818324Y

CN2818324Y - Fly wheel of bicycle gearset

Info

Publication number: CN2818324Y
Application number: CN 200520002742
Authority: CN
Inventors: 李忠家
Original assignee: HANBIN ENTERPRISE CO Ltd
Current assignee: HANBIN ENTERPRISE CO Ltd
Priority date: 2005-02-23
Filing date: 2005-02-23
Publication date: 2006-09-20
Anticipated expiration: 2015-02-23

Abstract

The utility model relates to a fly wheel of a bicycle gear set, which primarily can effectively reduce the number of flywheel sprockets and increase the riding speed of a bicycle; the fly wheel comprises an outer alligatoring ring, and a ratchet wheel arranged in the outer alligatoring ring; an outer ring side is arranged outside the outer alligatoring ring; a radius from the outer ring side to a centre position is 1.4 to 1.53 times larger than that of the inner diameter of the ratchet wheel. Thus, the outer diameter of the outer ring side is reduced without changing the specification of the ratchet wheel. The utility model is a flywheel with 13 sprockets.

Description

The flywheel of bicycle gears group

Technical field

The utility model is a kind of flywheel of bicycle gears group, and it is involved in the technical field of bicycle, refers to that especially bicycle is installed in the flywheel of trailing wheel.

Background technology

Single the flywheel that bicycle is installed at trailing wheel as shown in Figure 4, it comprises an outer tooth ring 41, and is installed on ring-type pawl wheel 50 in the outer tooth ring 41, outer tooth ring 41 outsides are divided into 14 sprockets 42, these outer tooth ring 41 madial walls are to form about 18 ratchets 52, for the ratchet (not shown) of pawl wheel 50 and ratchet 52 form the unidirectional driven rotary that can link, can break away from and the state that dallies (this is a known techniques, do not give unnecessary details separately in this), form an inner bolt hole 51 in the pawl wheel 50, in order to connect the wheel shaft (not shown) of bicycle rear.

For bicycle, the ratio of revolution gap of large fluted disc and flywheel is bigger, meaning is that the number of teeth of flywheel is fewer, then the number of turns of flywheel drive trailing wheel in unit time rotation the more, speed can effectively be accelerated, yet be limited to the torsion strength that flywheel can bear, and pawl wheel is unitarity, factor such as immutable for specification shape, the size that links the flower hub, the outer tooth ring outside only can form 14 sprockets, hoisting speeies more at present.

Summary of the invention

Because the problem that still exists of aforementioned known design, develop a kind of flywheel of bicycle gears group, do not become in the pawl wheel specification, under the sprocket size unmodified condition, just can effectively reduce the external diameter of outer tooth ring and establish tool and go out 13 sprockets so as to flywheel.

The technological means that the utility model used is the flywheel that is to provide a kind of bicycle gears group, and it comprises:

One outer tooth ring, this outer tooth ring one end is provided with the outer rim side of a ring thickness, and five equilibrium extends 13 sprockets on the outer peripheral face of outer rim side;

One is installed on the ring-type pawl wheel in the outer tooth ring, forms inner bolt hole in this pawl wheel, and the outer rim side of this outer tooth ring is equivalent to the radius of pawl wheel inner bolt hole inboard to the outer tooth ring same central position to the radius of outer tooth ring center, is 1.4 to 1.53 times.

The effect that the utility model can obtain, the outer tooth ring that mainly is flywheel utilizes outer rim side thickness to change, make the outer rim side radius of outer tooth ring, be equivalent to 1.4 to 1.53 times of pawl wheel internal diameter radius, can take into account the torsion strength that outer tooth ring is driven by pawl wheel, reduce external diameter effectively and make flywheel draw 13 sprockets, when allowing flywheel be applicable to bicycle, must quicken the flywheel rotation number of turns and promote speed by bike, strive for bigger match competitive edge.

The accompanying drawing summary

Fig. 1 is the stereo appearance figure of the utility model outer tooth ring.

Fig. 2 is the stereo appearance figure of the utility model flywheel.

Fig. 3 is the front view of the utility model outer tooth ring.

Fig. 4 is the outer tooth ring front view of existing flywheel.

The specific embodiment

The utility model is a kind of flywheel of bicycle gears group, and please referring to Fig. 1-2, basically, flywheel 10 still comprises an outer tooth ring 20, and is installed on ring-type pawl wheel 30 in the outer tooth ring 20, and this pawl wheel 30 still forms an inner bolt hole 31; The utility model mainly be outer tooth ring 20 outer circumferential sides under sprocket 21 big or small unmodified conditions, can be set to 13 sprockets 21 by five equilibrium, 14 sprockets will lack more in the past.

This outer tooth ring 20 mainly is to make with higher hardness materials such as high-carbon steels, and the outer rim side 22 that outer tooth ring 20 extends sprocket 21, it is to the radius a of outer tooth ring 20 centers, be equivalent to pawl wheel 30 inner bolt holes 31 inboards 1.4 to 1.53 times to the radius b of outer tooth ring 20 same central position, and traditional with Fig. 4 respectively a ', b ' distance is compared, a ' distance among Fig. 4 shows than this case a distance for long, so the utility model can be constant in pawl wheel 30 specifications own, under single the big or small constant condition of sprocket 21 forms, meaning promptly, the thickness of outer rim side 22 effectively reduces, and makes outer tooth ring 20 reduced outside diameter and 13 sprockets 21 must be set; In addition, the ratchet 24 of the utility model outer tooth ring 20 inboards is set to 21 teeth, increases the contact surface of pawl wheel 30 and ratchet 24, promotes both smoothness in relative rotation.

In sum, the outer rim side 22 that the utility model sees through outer tooth ring 20 changes shape, and collocation outer tooth ring 20 is selected high hardness materials such as high-carbon steel for use, makes outer tooth ring 20 be able to thin outer rim side 22 thickness, form less sprocket 21, the speed that provides flywheel 10 to be increased the bicycle benz.

Claims

1. the flywheel of a bicycle gears group, it comprises:

One is installed on the ring-type pawl wheel in the outer tooth ring, forms inner bolt hole in this pawl wheel, and the outer rim side of this outer tooth ring is to the radius of outer tooth ring center, is equivalent to pawl wheel inner bolt hole inboard 1.4 to 1.53 times to the radius of outer tooth ring same central position.

2. the flywheel of bicycle gears group as claimed in claim 1, the ratchet of described outer tooth ring inboard is set to 21 teeth.