Optimization of Pivot Obliquity for a Foldable Bicycle

다국어 초록 (Multilingual Abstract)

The folding technology which enables bicycle to be carried and stored easily is divided into various folding mechanism according to the number of hinges and the direction of pivot axis. The single lateral pivot type foldable bicycle is considered a promising personal mobility since it allows quick and easy folding motion and access to public transit system. However, there are significant troubles in folding dimensions that both the front and rear wheels are arranged in a slanted way, and the folding width increases at the bottom. It is because the pivot axis is slanted from the exact lateral axis so that the interference between the front and rear wheel in the course of folding could be prevented. This study aims at designing the optimal pivot obliquity of a lateral pivot type of foldable bicycles to align both the front and rear wheels in parallel. The variables of the pivot axis obliquity were set as the azimuthal angle (ϕ) and polar angle (θ), and a parametric simulation was carried out. It is revealed that the azimuthal angle affect the alignment angle between the front and rear wheels, and optimal azimuthal angle could be derived which makes the alignment angle to 0o. The findings from this study will contribute to the popularization of foldable bicycles with excellent usability and smaller folding width.

참고문헌 (Reference)

1 정태성, "대중교통 연계를 고려한 도심형 접이식 자전거 개발" 한국소성가공학회 22 (22): 42-47, 2013

2 이필립, "고부가가치 자전거 개발을 위한 제품모델 및 관리시스템 개발" 대한기계학회 35 (35): 469-477, 2011

3 윤순현, "Study of Several Design Parameters on Multi-blade Vertical Axis Wind Turbine" 한국정밀공학회 14 (14): 831-837, 2013

4 Hegger, R., "Public Transport and Cycling: Living Apart or Together?" 56 (56): 38-41, 2007

5 Pirnat, M., "Measuring Dynamic Loads on a Foldable City Bicycle" 57 (57): 21-26, 2011

6 Pucher, J., "Integrating Bicycling and Public Transport in North America" 12 (12): 79-104, 2009

7 Pucher, J., "Integrating Bicycling and Public Transport in North America" 12 (12): 79-104, 2009

8 Bowes, D. R., "Identifying the Impacts of Rail Transit Stations on Residential Property Values" 50 (50): 1-25, 2001

9 Arunachalam, M., "Foldable Bicycle: Evaluation of Existing Design and Novel Design Proposals" 9 (9): 706-710, 2014

10 Cheng, Y.-H., "Evaluating Bicycle-Transit Users’Perceptions of Intermodal Inconvenience" 46 (46): 1690-1706, 2012

11 Singh, A. K., "Concept of User Friendly Modified Folding Bicycle" 3 (3): 16-20, 2014

12 Arunachalam, M., "A Typical Approach in Conceptual and Embodiment Design of Foldable Bicycle" 87 (87): 9-16, 2014

13 김필기, "A Parametric Dynamic Study on Hunting Stability of Full Dual-Bogie Railway Vehicle" 한국정밀공학회 12 (12): 505-519, 2011