Resonance suppression structure using vibration-damping material in a torsion beam rear suspension

Abstract

To improve driving stability and comfort by suppressing resonance that occurs when a vehicle equipped with a torsion beam rear suspension travels at medium to high speeds and improving roll behavior and tension. [Solution] A 3mm thick, 300mm long, and 30mm wide EPDM rubber vibration damping material is attached to a recess formed on the underside of the torsion beam using strong double-sided tape, effectively damping resonance.

Description

[Technical Field] This invention relates to a torsion beam rear suspension, and in particular to the application of vibration-damping materials to provide the structure with a resonance suppression function. [Background technology] Conventionally, torsion beams have often been constructed as rigid bodies, which has led to the problem of body resonance occurring easily at certain speeds in lightweight vehicles. Problem to be Solved by the Invention: Conventional torsion beam structures can cause a stiff feeling or fluttering during vehicle roll and rough terrain driving, which can adversely affect handling and ride comfort. The purpose of this invention is to suppress this resonance and improve handling stability and comfort by applying vibration-damping material to the torsion beam. Means to Solve the Problem: This invention uses an EPDM sheet (3 mm thick, 300 mm long, 30 mm wide) attached with strong double-sided tape to a recessed area on the underside of the torsion beam. This effectively damps resonance that occurs during medium to high speed driving, suppressing unnatural roll behavior and fluttering when one wheel passes over another. The target vehicle is a Toyota iQ (NGJ10). The rear suspension is a torsion beam type. An EPDM vibration-damping sheet is continuously attached along the entire length of the recessed area on the underside of the torsion beam. The vehicle's cornering behavior feels smoother, and there is less interference between the left and right wheels when passing over obstacles such as manholes. Improvements in ride comfort and maneuverability have been confirmed. [Brief explanation of the drawings] [Figure 1] Torsion beam rear suspension schematic [Figure 2] Cross section of AA' in Figure 1 [Figure 3] Before and after the resonance suppression structure treatment using vibration-damping material attached to the torsion beam suspension. Left: before treatment, while driving. Right: after treatment, while driving. Effects: · Suppresses resonance in the 40-120km / h range · Left and right wheels move independently, improving roll behavior · Reduced stiffness and flapping improves driving stability and comfort [Industrial Applicability] This invention is not limited to lightweight compact cars, but can also be applied to many commercially available vehicles that use torsion beam suspension, and is highly useful in the fields of vibration control and tuning.

Claims

1. A resonance suppression structure for a vehicle equipped with a torsion beam rear suspension, characterized in that a vibration-damping material made of EPDM (ethylene propylene diene monomer) rubber is adhesively fixed to a recess provided on the underside of the torsion beam.

2. 2. The resonance suppression structure according to claim 1, wherein the vibration-damping material is a strip-shaped member having a thickness of 3 mm, a length of 300 mm, and a width of 30 mm, and the vibration-damping material is attached over the entire length of the recess in the underside of the torsion beam.

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