Method for manufacturing open type bicycle hollow crank and crank manufactured thereby
A manufacturing method and bicycle technology, which can be applied to crank structures, vehicle parts, railway car body parts, etc., can solve problems such as increased material cost and heavy weight.
Inactive Publication Date: 2008-04-09
参联国际股份有限公司
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Problems solved by technology
[0003] Yet existing this kind open type bicycle crank 2, because its whole crank is solid shape, therefore, makes whole crank structure have certain weight, and for nowadays bicycle more and more emphasizes light weight today, how to make product light Quality is what the industry is eager to pursue, so its weight is what needs to be improved
[0004] In addition, due to the solid structural design of the entire crank, the material cost of the entire crank is virtually increased when it is first manufactured, and it needs to be improved and overcome.
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[0020] Cooperate figure 1 , Shown in 2 and 3, the manufacture method of open type bicycle hollow crank 3 of the present invention, its main steps include:
[0021] (1) Preliminary forming steps of the crank 3: the raw material of the bicycle hollow crank is initially formed by forging with a forging machine in the mold to form a front end 31 and a rear end 32, and the rear end 32 is further made into an open shape 321, and Its front end portion 31 is then made into a perforation 311 for cooperating with the bicycle pedal (not shown) at the same time;
[0022] (2) The step of making the inside of the crank 3 hollow: use the rear end 32 of the crank 3 to form an opening 321 , directly from the center of the opening end along the axial direction of the inside of the crank 3 by drilling, forging or other means. Set as a hollow shape 33;
[0023] (3) Forging and forming steps of the rear end 32 of the crank 3: After the entire crank 3 is made into a hollow shape 33 in the axial d...
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The invention relates to a method for producing open hollow crank of vehicle, and relative crank. Said method comprises: (1), initially shaping the crank that putting the material into mould to be shaped via forging press, to form a front part and a back part, while the back part is processed into open shape and the front part has a through hole matched with vehicle pedals; (2), making the crank hollow that using the step that making the back part open, to directly make the crank hollow along the axle via drilling or other method; (3), forging and shaping the back part that after making the whole crank hollow, then forging the open back part to be the open shape that matched with the spindle of five tubes of vehicle frame. The invention can reduce the weight of whole crank.
Description
technical field [0001] The invention relates to a method for manufacturing a bicycle crank, in particular to a method for manufacturing an open bicycle crank. Background technique [0002] Referring to Fig. 4, the existing open-type bicycle crank 2 manufacturing method generally adopts casting or forging, and after the whole crank 2 is directly manufactured as one piece, a perforation 21 is provided at the front end of the crank 2. , to be combined with the bicycle pedal spindle (not shown), and its rear end is provided with an open shape 22, which can be used to coordinate with the spindle (not shown) in the bottom bracket tube of the bicycle. [0003] Yet existing this kind open type bicycle crank 2, because its whole crank is solid shape, therefore, makes whole crank structure have certain weight, and for nowadays bicycle more and more emphasizes light weight today, how to make product light Quality is what the industry is eager to pursue, so its weight is what needs to ...
Claims
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IPC IPC(8): B21K7/12B23P13/00B62M3/00
Inventor 陈俊峰
Owner 参联国际股份有限公司