The Effect of Test Standards on Designing Light-weight Bicycle Pedals - EN Dynamic Durability Test Applied

• Main Authors: Min-Hua Tang, 唐民華
• Other Authors: Tai-Shen Huang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/98mg38

碩士 === 朝陽科技大學 === 工業設計系 === 102 === This study mainly discusses light weight design of ball bearing pedals used for mountain bicycles in order to meet the market trend. Based on materials, manufacturing methods and structures, there are four approaches to reduce the weight of bicycle pedals: 1. changing the materials of pedal axis or pedal frame; 2. re-designing the pedal pattern; 3. changing the processing method; and 4. altering the pedal structure. Among the above four approaches, altering the pedal structure in size and rotation assembly creates the greatest effect on passing the EN test standards. Bicycle pedals cannot be marketed in the EU zone unless they pass the EN test. The EN criteria have been used as the test method for exporting bicycle pedals. By 2013, the EU zone had been Taiwan’s No. 1 export market in this field. The experimental method is used for carrying out the research and the EN standards are applied to conduct the experiment. The pedals currently meeting the EN standards are used for light-weight design in this study. Based on the parts and structures of the standard pedals, the cause and effect analysis is applied to analyze and modify the parts and the structure. Two samples are made for the test so as to verify if the modified parts and structure can meet the EN standards. An analysis and comparison are also made by software on the modified axis. The results are described as follows. 1. Longer diameter achieves a better performance when the axis end surface is used to offset the bending moment caused by load. Moreover, direct contact with a single axis can obtain the best result for counteracting load. 2. A change of rotation pivot pattern is made from two ends to one end bearing load. However, such change increases imbalanced load bearing and causes greater wear of parts. 3. The use of double axes causes the greatest load bearing on rotating parts while the inner axis is turning. Thus, the parts wear to a greater degree. It’s better to use two bearings. 4. While stamping on the pedals, the inward component of force is nearly zero. Under such a circumstance, the step difference between the axis and bearing for generating thrust can be reduced to the inner ring of the bearing, which equals to the length of the diameter.