Patent Application
20060172075
The invention relates to a compound and method of use of the compound for reduction of noise in a vehicle. In particular, the invention relates to a compound which is applied to the interior of a panel of an automobile to reduce noise.
It is currently known as disclosed in Japanese Publication No. 06-246878 published Sep. 6, 1994 to attach a sheet of synthetic material to the interior panel of a vehicle such as a door to dampen vibration and reduce noise. The Japanese publication discloses the use of a sheet having polybutane within the interior of the door. It is also known to use sheets of material containing butyl rubber which are attached to the door by an adhesive such as mastic. However, application of such materials by adhesive and the like is labor intensive. Additionally, it would be advantageous to provide a material which would improve the level of noise reduction and which could be easily applied to the body.
The invention relates to a synthetic compound consisting of a synthetic rubber and calcium carbonate and process oil which may be applied to internal surfaces of a vehicle. The material may be applied as a sheet which is fixed with an adhesive or alternatively may be formed into a paste which may be sprayed onto the interior surface of the vehicle.
A better understanding of the present invention will be had upon reference to the following detailed description when read in conjunction with the accompanying drawings in which like parts are given like reference numerals and wherein:
The present invention provides a novel viscoelastic compound and method of application for vibration and noise dampening in a vehicle 10. As shown in
The material of the compound 12 is produced by Iida Sangyo of Japan. The compound 10 is composed as set forth in the following table:
The compound 12 applied in this form may be a solid sheet-type material. However, by use of an expansion material such as ADCA, the compound is expanded from 3-30 times and preferably 20-30 times. By adding (quantity) the compound is formed into a paste which may be sprayed directly to the sheet metal of the vehicle before the ED coat. The material has a visco-elasticity characteristic so that the energy of vibration is changed to heat and released. As shown in the tables 2, 3, 4 and 5 the compound has improved noise and vibration dampening with conventional material. Conventional material tables 2, 3, 4 and 5 provide a comparison of the vibration dampening of a conventional asphalt sheet with the compound of the invention taken at points A, B, C and D on the door panel as shown in
From the foregoing, it can be seen that the above embodiments provide an improved viscoelastic compound 12 for vibration and noise reduction in a vehicle 10. The viscoelastic compound is lighter in weight and easier to apply than previously known materials. Having described the invention, however, modifications thereto may become apparent to those skilled in the art to which it pertains without deviation from the spirit of the invention as defined by the scope of the appended claims.
