CN203157593U - Bicycle hub - Google Patents

Abstract

The utility model discloses a bicycle hub which comprises a sun gear, a middle pipe, a nine-teeth part, a shaft center, wheel blades and three non-return keys, wherein the middle pipe, the wheel blades, the sun gear and the nine-teeth part are arranged on the shaft center in a sleeving way; the wheel blades are arranged on two sides of the middle pipe; the sun gear is positioned in the middle pipe; the nine-teeth part is matched with the middle pipe, and the non-return keys are mounted uniformly between the nine-teeth part and the sun gear; and the middle pipe and the sun gear are integrated. According to the bicycle hub provided by the utility model, as the sun gear and the middle pipe are integrated, the step of combining the sun gear with the middle pipe by pressing is omitted, mounting technology of the bicycle hub is simplified, concentricity of the sun gear and the middle pipe is improved, production cost is reduced, and the problems of low strength and low qualification rate of the sun gear caused by crack of the sun gear when in combination with the middle pipe are further avoided.

Description

A kind of bicycle drive shaft

Technical field

The utility model relates to a kind of bicycle drive shaft.

Background technology

Bicycle drive shaft comprises sun tooth, middle pipe, nine teeth, axle center, wheel blade, and the non-return key; Middle pipe, wheel blade, sun tooth, and nine teeth all are set on the axle center; The both sides of middle pipe are provided with wheel blade; Sun tooth is arranged in pipe; Nine teeth match with middle pipe, and between nine teeth and the sun tooth three non-return keys are installed evenly; Cooperate with the non-return key by sun tooth and can drive flower-drum action.

At present, sun tooth and middle pipe adopt the pressing installation and interference fit.Sun tooth is by cooperating to drive the flower-drum action with the non-return key, so sun tooth intensity must be very high.In order to increase the intensity of sun tooth, need heat-treat sun tooth.Though sun tooth after heat treatment, its hardness is very high.Yet when by external force sun tooth and middle pipe pressing being installed together, not only the concentricity of sun tooth and middle pipe is not high, and is easy to cause the sun tooth external diameter be full of cracks to occur, causes the intensity of sun tooth to reduce greatly, greatly reduces its qualification rate yet.By bike the time, if be subjected to external force collision or extruding, be easy to occur the problem of sun tooth fracture.

The utility model content

For solving the problems of the technologies described above, the utility model provides a kind of bicycle drive shaft, reaching the concentricity that improves sun tooth and middle pipe and to reduce production costs, and the intensity and the qualification rate purpose that improve sun tooth.

For achieving the above object, the technical solution of the utility model is as follows:

A kind of bicycle drive shaft, described flower-drum comprise sun tooth, middle pipe, nine teeth, axle center, wheel blade, and the non-return key; Pipe, wheel blade, sun tooth in described, and nine teeth all are set on the described axle center; The both sides of pipe are provided with described wheel blade in described; Described sun tooth is arranged in described pipe; Described nine teeth match with described middle pipe, and between described nine teeth and the described sun tooth three described non-return keys are installed evenly; Pipe is one with described sun tooth in described.

Compared with prior art, the beneficial effects of the utility model are: described sun tooth and described middle pipe are one-body molded by forging and pressing, removed from by pressing coming in conjunction with described sun tooth and middle pipe, thereby not only simplified bicycle drive shaft mounting process, improved the concentricity of sun tooth and middle pipe, reduced productive costs; Also can avoid because of described sun tooth and the fashionable generation crack performance of middle duct ligation, and cause intensity and the low problem of qualification rate of sun tooth.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below.

Fig. 1 is the structural representation of the disclosed a kind of bicycle drive shaft of the utility model embodiment;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the cutaway view along A-A among Fig. 1;

Fig. 4 is the disclosed sun tooth of one and the structural representation of middle pipe of being of the utility model embodiment.

The specific embodiment

Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described.

Referring to figs. 1 to Fig. 4, a kind of bicycle drive shaft provided by the utility model, described flower-drum comprise sun tooth 9, middle pipe 13, nine teeth 5, axle center 2, wheel blade 8, and non-return key 10; Pipe 13, wheel blade 8, sun tooth 9 in described, and nine teeth 5 all are set on the described axle center 2, the two ends in described axle center 2 all outside in are equipped with flange nut 1 and jam nut 3 successively; The both sides of pipe 13 are provided with described wheel blade 8 in described; Described sun tooth 9 is arranged in described pipe 13; Described nine teeth 5 match with described middle pipe 13, and between described nine teeth 5 and the described sun tooth 9 three described non-return keys 10 are installed evenly; Pipe 13 is one with described sun tooth 9 in described.

A kind of bicycle drive shaft that the utility model provides, described sun tooth 9 with described in pipe 13 be one, removed from by pressing sun tooth 9 and middle pipe 13 be installed, thereby not only simplified the mounting process of bicycle drive shaft, reduced productive costs; Also can avoid because of described sun tooth 9 and middle pipe 13 in conjunction with the time crack performance takes place, and cause intensity and the low problem of qualification rate of sun tooth 9.

To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments herein.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.

Claims (1)

1. bicycle drive shaft, described flower-drum comprises sun tooth, middle pipe, nine teeth, axle center, wheel blade, and the non-return key; Pipe, wheel blade, sun tooth in described, and nine teeth all are set on the described axle center; The both sides of pipe are provided with described wheel blade in described; Described sun tooth is arranged in described pipe; Described nine teeth match with described middle pipe, and between described nine teeth and the described sun tooth three described non-return keys are installed evenly, it is characterized in that, described middle pipe is one with described sun tooth.

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