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Design Innovation Paper

Design and Analysis of a Novel Centrifugal Braking Device for a Mechanical Antilock Braking System

[+] Author and Article Information
Cheng-Ping Yang

Mechanism and Machine Theory Laboratory,
Department of Mechanical Engineering,
National Taiwan University,
Taipei 106, Taiwan
e-mail: f99522613@ntu.edu.tw

Ming-Shien Yang

Department of Mechanical Engineering,
National Taiwan University,
Taipei 106, Taiwan
e-mail: r02522609@ntu.edu.tw

Tyng Liu

Associate Professor
Department of Mechanical Engineering,
National Taiwan University,
Taipei 106, Taiwan
e-mail: tliu@ntu.edu.tw

1Corresponding author.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received August 26, 2014; final manuscript received March 4, 2015; published online April 2, 2015. Assoc. Editor: Qi Fan.

J. Mech. Des 137(6), 065002 (Jun 01, 2015) (7 pages) Paper No: MD-14-1519; doi: 10.1115/1.4030014 History: Received August 26, 2014; Revised March 04, 2015; Online April 02, 2015

A new concept for a mechanical antilock braking system (ABS) with a centrifugal braking device (CBD), termed a centrifugal ABS (C-ABS), is presented and developed in this paper. This new CBD functions as a brake in which the output braking torque adjusts itself depending on the speed of the output rotation. First, the structure and mechanical models of the entire braking system are introduced and established. Second, a numerical computer program for simulating the operation of the system is developed. The characteristics of the system can be easily identified and can be designed with better performance by using this program to studying the effects of different design parameters. Finally, the difference in the braking performance between the C-ABS and the braking system with or without a traditional ABS is discussed. The simulation results indicate that the C-ABS can prevent the wheel from locking even if excessive operating force is provided while still maintaining acceptable braking performance.

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References

Figures

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Fig. 1

Basic composition of the C-ABS

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Fig. 3

The mechanical model of the centrifugal brake shoe

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Fig. 4

Variation in the friction coefficient with temperature [17]

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Fig. 5

Variations in the braking torque with changes in the fluid pressure ratio P1

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Fig. 6

Variations in the skid ratio with changes in the fluid pressure ratio P1

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Fig. 7

Variations in the braking torque with changes in the speed-increasing gear ratio K

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Fig. 8

Variations in the skid ratio with changes in the speed-increasing gear ratio K

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Fig. 9

Comparison of the braking torque between the C-ABS and original braking system: (a) dry surface conditions and (b) wet surface conditions

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Fig. 10

Comparison of the wheel speed and vehicle speed between the C-ABS and original braking system: (a) Dry surface conditions and (b) wet surface conditions

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