Patent Application
20080296963
1. Field of the Invention
The present invention relates to a bicycle hub, and more particularly to a positioning structure for a bicycle hub and a method for making the same.
2. Description of the Prior Art
Bicycle is a traffic tool for leisure sport and racing, which is not only environmental friendly, but also can provide exercise for the rider. The bicycle hub is an important component for connecting the bicycle frame and the wheel. As shown in
1. After the flange 13 of the bicycle hub 10 is cut thin, it will damage the structure strength of the original flange 13, but this bicycle hub 10 will not only be subjected to a heavy load but to a high speed rotation, therefore, the flange 13 will definitely be deformed after a long-term of use. Moreover, if the bicycle hub 10 breaks during a high speed ride, it will severely affect the riding safety. The bicycle can be bought after destroyed, but the life safety can not be neglected;
2. The positioning structure 14 is formed by cutting the flange 13 of the bicycle hub 10, in order to accurately control the thickness during the cutting process, the machining speed must be affected and the machining time must be prolonged, thus causing the waste of the cost.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary objective of the present invention is to provide positioning structure for a bicycle hub formed by a quick press forming process, the second objective of the present invention is to provide a positioning structure for a bicycle hub which doesn't affect the strength of structure.
In order to achieve the abovementioned two objectives, the bicycle hub comprises a hub shell, and each end of the hub shell is radially formed with a fixing portion one side of each fixing portion is formed with a receiving portion. The bicycle hub is pressed by a positioning machine and a punch to form a positioning structure. The positioning machine includes an upper clamping arm and a lower clamping arm for clamping the outer surface of the bicycle hub. The punch includes a punching member, and one end of the punching member is formed with a punching head. On the periphery of the punching head are formed at least three annularly-arranged parallel punching ribs. The inner surface of each receiving portion is pressed by the punching head of the punch, so as to form at least three positioning structures shaped correspondingly to the punching ribs of the punching head. The positioning structures are in the form of flange and located at the same level.
A method of making the abovementioned positioning structure for a bicycle hub of the present invention comprises the following steps: A. bicycle hub clamping step: clamping an outer surface of the bicycle hub by a positioning machine firstly; B. bicycle hub press forming step: after the outer surface of the hub shell is clamped by the positioning machine, axially pressing the inner surface of each receiving portion with the punch by using points as targets, so as to form at least three positioning structures on the receiving portion that are shaped correspondingly to the punching ribs of the punch; and C. bicycle hub loading step: after the inner surface of each receiving portion is pressed by the punch to form at least three positioning structures, placing a bearing in each receiving portion of the bicycle hub, and the bearing is positioned by the receiving portion.
With the abovementioned positioning structure for a bicycle hub and the making method, it can achieve the following objectives:
1. The press forming process of the positioning structure 24 of the bicycle hub 20 is performed by using points as the punching and pressing targets without influencing the structure strength of the receiving portion 23, so that the receiving portion 23 of the bicycle hub 20 is strong enough to load the weight, and the rider can ride safely without worrying about the ruin of the bicycle hub.
2. The bicycle hub 20 provides the quick press forming positioning structure 24, so that the machining speed is increased and the machining time is shortened, thus saving the manpower cost and the machining cost.
The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
Referring to
The bicycle hub 20 is pressed by a positioning machine 30 and a punch 40 to form a positioning structure 24. The positioning machine 30 (as shown in
The receiving portion 23 of the bicycle hub 20 (as shown in
1. The press forming process of the positioning structure 24 of the bicycle hub 20 is performed by using points as the punching and pressing targets without influencing the structure strength of the receiving portion 23, so that the receiving portion 23 of the bicycle hub 20 is strong enough to load the weight, and the rider can ride safely without worrying about the ruin of the bicycle hub.
2. The bicycle hub 20 provides the quick: press forming positioning structure 24, so that the machining speed is increased and the machining time is shortened, thus saving the manpower cost and the machining cost.
The aforementioned is the summary of the positional and structural relationship of the respective components and its operation and function of the preferred embodiment in accordance with the present invention.
Referring to
A. bicycle hub clamping step: clamping the outer surface of the hub shell 21 of the bicycle hub 20 with the upper clamping arm 31 and the lower clamping arm 32;
B. bicycle hub press forming step: pressing the inner surface of the receiving portion 23 with the punching head 411 of the punching member 41 of the punch 40 by inserting the punching head 411 of the punching member 41 into the open end of the receiving portion 23, so as to form at least three positioning structures 24 on each receiving portion 23 of the bicycle hub 20 that are shaped correspondingly to the punching ribs 412 of the punching head 411, after the outer surface of the hub shell 21 of the bicycle hub 20 is clamped by the positioning machine 30; and
C. bicycle hub loading step: placing the bearing A in the receiving portion 23 of the bicycle hub 20, after the three positioning structures 24 are formed by the punch 30, the bearing A is positioned by the positioning structures 24 of the receiving portion 23.
The following objectives can be achieved by analyzing the abovementioned steps:
1. The press forming process of the positioning structure 24 of the bicycle hub 20 is performed by using points as the punching and pressing targets without influencing the structure strength of the receiving portion 23, so that the receiving portion 23 of the bicycle hub 20 is strong enough to load the weight, and the rider can ride safety without worrying about the rain of the bicycle hub.
2. The bicycle hub 20 provides the quick press forming positioning structure 24, so that the machining speed is increased and the machining time is shortened, thus saving the manpower cost and the machining cost.
To summarize, the present invention relates to a positioning structure for a bicycle hub and method for making the same. The bicycle hub in accordance with the present invention comprises a hub shell. Each end of the hub shell is formed with a receiving portion, and the outer surface of the hub shell is clamped by a positioning machine. The inner wall of each receiving portion is axially pressed to form at least three positioning structures by the punch. The method of forming the positioning structures comprises the following steps: A. bicycle hub clamping step; B. bicycle hub press forming step; and C. bicycle hub loading step. By such arrangements, the positioning structures of the bicycle hub can be obtained by the quick press forming without affecting the structure strength.
While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
