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Research Papers

Synthesis of a Rear Wheel Suspension Mechanism With Pure Rectilinear Motion

[+] Author and Article Information
Jing-Shan Zhao

Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, P. R. Chinajingshanzhao@mail.tsinghua.edu.cn

Fulei Chu, Zhi-Jing Feng, Sheng Zhao

Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, P. R. China

J. Mech. Des 131(10), 101007 (Sep 16, 2009) (9 pages) doi:10.1115/1.3179153 History: Received December 17, 2008; Revised May 06, 2009; Published September 16, 2009

This paper focuses on the synthesis of an independent suspension that can guide the wheel to track a straight line when moving up (jounce) and down (rebound). With displacement subgroups, it first synthesizes a rigid body guidance mechanism and verifies the result through screw theory. To simplify and optimize the loads of each kinematic chain of the knuckle, it investigates the static equations and ultimately synthesizes a symmetric redundant-constraint suspension structure, which could not only eliminate the shambling shocks induced by the jumping of wheels but also decrease the abrasion of tires. Theoretically, only one pair of noncoplanar kinematic chains is necessary to realize straight line guidance. However, a second pair of noncoplanar kinematic chains is particularly utilized to improve the load status of the links. Because of the redundant constraints induced by the suspension structures, the whole weight can be significantly reduced compared with the initial one. ADAMS simulations with a set of real parameters indicate that the rear suspension mechanism proposed in this paper can guide the wheel to follow a rectilinear locus during jounce and rebound. Therefore, this kind of independent suspension can improve the ride and handling properties of advanced vehicles.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The structure of Sarrus linkage

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Figure 2

A RR-kinematic chain consisting of two revolute pairs

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Figure 3

The simplest kinematic chains of an end-effector

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Figure 4

The architecture of a spatial six-bar mechanism

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Figure 5

The forces exerted to the end-effector by the two chains

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Figure 6

The equivalent mechanism in motion

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Figure 7

The suspension mechanism

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Figure 8

Assemblies of the rear suspension mechanisms

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Figure 9

The travel length of the suspension mechanism

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